CN118422431A

CN118422431A - Sewing device

Info

Publication number: CN118422431A
Application number: CN202410105275.5A
Authority: CN
Inventors: 阮光伟; 鬼头宏明
Original assignee: Brother Industries Ltd
Current assignee: Brother Industries Ltd
Priority date: 2023-02-02
Filing date: 2024-01-25
Publication date: 2024-08-02
Also published as: JP2024110317A

Abstract

The application provides a sewing device, which improves the setting freedom degree of the length of upper thread and bottom thread compared with the prior art. The control device of the sewing device drives the needle bar mechanism and the conveying mechanism, and forms a stitch on the sewing object by using the upper thread and the bottom thread (S7). The control device performs thread catching processing, in which the motor is driven to move the movable cutter from the cutter standby position to the upper thread catching position and further to the movable position opposite to the cutter standby position with respect to the upper thread catching position in accordance with the last stitch being formed on the sewn article (S15). The control device conveys the sewed object by a preset distance by a conveying mechanism under the condition that the movable cutter is in a state of capturing the upper thread by the thread capturing processing of S15 and the lower end of the needle is positioned above the needle plate (S18). The control device drives the motor after the processing of S18 to move the movable cutter to a cutting position crossing the fixed cutter to cut the upper thread and the lower thread (S19).

Description

Sewing device

Technical Field

The present invention relates to a sewing device.

Background

The conventional sewing device is provided with a thread length adjusting mechanism, a guide and a cutting member. The cutting member cuts the upper thread and the lower thread between the hole of the needle plate and the cutting member. The wire length adjusting mechanism includes an adjusting blade. The adjusting knife part is arranged between the hole of the needle plate and the cutting member, and the length of the upper thread and the lower thread from the hole of the needle plate to the cutting member is adjusted by capturing the upper thread and the lower thread and moving. The guiding part is arranged between the hole of the needle plate and the adjusting knife part, and guides the upper thread and the lower thread when the adjusting knife part moves. The guide portion is capable of changing the lengths of the hole connecting the needle plate, the guide portion, and the second wire feeding path of the adjusting knife portion with respect to the first wire feeding path of the hole directly connecting the needle plate and the adjusting knife portion. Since the length of the first thread feeding path is set longer than that of the second thread feeding path, the sewing device can obtain the same thread margin as that obtained through the first thread feeding path by adjusting the small movement amount of the knife part.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2021-115365

Disclosure of Invention

Problems to be solved by the invention

In the conventional sewing device, the length of the upper thread and the lower thread is limited by the movable amount of the adjusting knife part.

The invention aims to provide a sewing device which improves the setting freedom degree of the length of upper thread and bottom thread compared with the prior art.

Solution for solving the problem

The sewing device according to claim 1 of the present invention comprises: a needle bar mechanism having a needle bar, a lower end of the needle bar being capable of mounting a needle, the needle bar mechanism swinging the needle bar in an up-down direction; a needle plate, in which a needle accommodating hole is formed for the needle to penetrate; a conveying mechanism for conveying the sewing material to at least one direction relative to the needle bar mechanism; a cutting mechanism capable of cutting the upper thread and the lower thread; and a control device that controls the needle bar mechanism, the conveying mechanism, and the cutting mechanism, the cutting mechanism having: a fixed cutter fixed to the lower side of the needle plate; a movable cutter which is provided so as to be rotatable in a horizontal direction with respect to the fixed cutter; and a tool moving unit having a motor for rotating the movable tool in the horizontal direction by power of the motor, wherein the control device performs: a sewing process in which the needle bar mechanism and the conveying mechanism are driven to form a stitch on the sewn article by using the upper thread and the lower thread; a thread catching process of driving the motor to move the movable cutter from a cutter standby position, in which the movable cutter is positioned apart from the fixed cutter in the horizontal direction, to a needle thread catching position, in which the movable cutter catches the needle thread positioned near the needle accommodating hole, and further to a movable position, in which the movable cutter is positioned on the opposite side of the needle thread catching position from the cutter standby position, in accordance with a stitch having a final sewing order on the sewn object; a length adjustment process of conveying the sewn article by the conveying mechanism for a predetermined distance under a condition that the movable cutter is caught by the thread catching process and the lower end of the needle is located above the needle plate; and a cutting process performed after the length adjustment process, wherein the motor is driven to move the movable cutter to a cutting position intersecting the fixed cutter, thereby cutting the upper thread and the lower thread. In the length adjustment process, the sewing device can adjust the lengths of the upper thread and the bottom thread from the sewing sequence of the last stitch by conveying the sewing object for a preset distance. The length adjustment process of the sewing device helps to increase the degree of freedom of the lengths of the upper thread and the lower thread by using a predetermined distance.

In the sewing machine according to claim 2 of the present invention, the control device controls the motor so that a moving speed of the movable cutter from the movable position to the cutting position until the upper thread and the lower thread are cut is lower than a moving speed of the movable cutter in the thread catching process. The sewing device can easily ensure the time for executing the length adjustment processing by making the moving speed of the movable cutter from the movable position to the cutting position until the upper thread and the bottom thread are cut lower than the moving speed of the movable cutter in the thread catching processing.

In the sewing device according to claim 3 of the present invention, the cutting position is located between the movable position and the cutter standby position. The sewing device can be made compact compared with a case where the cutting position is not located between the rotation position and the cutter standby position.

In the sewing device according to claim 4 of the present invention, the control device controls the motor to stop the movable cutter at a stop position between the movable position and the cutting position for a predetermined period of time after the thread catching process until the upper thread and the lower thread are cut in the cutting process. The sewing device can easily ensure the time required for conveying the sewing object for a predetermined distance in the length adjustment process compared with the case of not stopping at the stop position.

In the sewing device according to claim 5 of the present invention, the stop position is a position immediately before cutting the upper thread and the lower thread, and is the position at which a distance in the horizontal direction from the edge tip of the fixed cutter to the edge tip of the movable cutter is within 5 mm. The sewing device can properly cut the upper thread and the lower thread in the cutting process, compared with the case where the distance in the horizontal direction from the edge portion top of the fixed cutter to the edge portion top of the movable cutter is greater than 5 mm.

In the sewing device according to claim 6 of the present invention, the control device further executes a distance setting process of setting the predetermined distance inputted from the input unit, and in the length adjustment process, the sewn article is conveyed at the predetermined distance set in the distance setting process. The sewing device can improve the degree of freedom of setting the length of the upper thread and the lower thread compared with the case of not accepting the input of the preset distance.

In the sewing device according to claim 7 of the present invention, the rotation center of the movable cutter is provided on a side opposite to the motor side with respect to the needle hole in a direction from the motor toward the needle hole on a surface parallel to the needle plate. The sewing device can improve the degree of freedom of design of the motor side relative to the needle hole compared with the case that the rotation center of the movable cutter is arranged on the motor side relative to the needle hole in the direction from the motor to the needle hole on the surface parallel to the needle plate.

The sewing device according to claim 8 of the present invention includes a needle thread holding mechanism that is driven by the power of the motor and releasably holds an end portion of the needle thread passing through the needle at a lower side of the needle plate. The sewing device can utilize one motor to perform actions of the cutting mechanism and the upper thread holding mechanism. The sewing device holds the end of the bobbin thread by the cutting mechanism and holds the end of the upper thread by the upper thread holding mechanism, thereby inhibiting the defect generated by winding the end of the upper thread or the end of the bobbin thread into the thread.

In the sewing device according to claim 9 of the present invention, the upper thread holding mechanism includes: a first holding member provided on a lower surface of the needle plate; a second holding member rotatably supported by the supporting portion to the needle plate and holding the needle thread end in cooperation with the first holding member; and a holding movement unit that moves the second holding member in the horizontal direction by the power of the motor, and moves the second holding member to a standby position in which the Rong Zhenkong is arranged between the first holding member and the second holding member in the horizontal direction, and a holding position in which the second holding member is separated from the receptacle hole in the horizontal direction, and the second holding member overlaps the first holding member in the up-down direction. In the sewing device, the power of the upper thread holding mechanism can be shared with the cutting mechanism, so that the structure can be simplified compared with a sewing device provided with the power of the upper thread holding mechanism and the power of the cutting mechanism respectively.

In the sewing device according to claim 10 of the present invention, the support portion is provided on the motor side with respect to the needle hole in a direction from the motor toward the needle hole on a surface parallel to the needle plate. In the sewing device, the rotation center of the movable cutter of the cutting mechanism is arranged on the opposite side of the needle accommodating hole relative to the motor in the direction from the motor to the needle accommodating hole on the surface parallel to the needle plate, in this case, the possibility of interference between the upper thread holding mechanism and the cutting mechanism can be reduced, and the degree of freedom of design on the opposite side of the needle accommodating hole relative to the motor can be improved.

The sewing device according to claim 11 of the present invention further includes a biasing member fixed to a lower side of the needle plate, wherein the movable cutter includes: a wire holding portion capable of holding a base wire end portion of the base wire cut by the movable cutter between the wire holding portion and the biasing member; and a wire releasing portion that is not capable of holding the wire end portion between the wire holding portion and the biasing member, wherein the movable cutter is positioned at the cutter standby position when the second holding member is positioned at the standby position, and the movable cutter and the biasing member hold the wire end portion when the second holding member is positioned at the holding position. The sewing device can synchronize the actions of the upper thread holding mechanism and the cutting mechanism. The sewing device can clamp the end of the bottom thread by the cutting mechanism when the upper thread holding mechanism is positioned at the standby position and the holding position.

Drawings

Fig. 1 is an overall perspective view of the sewing apparatus 1.

Fig. 2 is a perspective view of the cutting mechanism 60 and the dough-line holding mechanism 80.

Fig. 3 is an exploded perspective view of a part of the cutting mechanism 60 and a part of the needle thread holding mechanism 80.

Fig. 4 is a bottom view of a part of the cutting mechanism 60 and a part of the upper thread holding mechanism 80.

Fig. 5 is a partial bottom view of the cutting mechanism 60.

Fig. 6 is a bottom view of the motor 59, the cam plate 70, and the links 73 and 74 that are part of the link mechanism 72.

Fig. 7 is a partial bottom view of the needle thread holding mechanism 80.

Fig. 8 is a block diagram showing an electrical structure of the sewing apparatus 1.

Fig. 9 is a flowchart of a main process of the sewing apparatus 1.

Fig. 10 (a) is a partial bottom view of the cutting mechanism 60 when the movable cutter 62 is located at the release position P2, fig. 10 (B) is a partial bottom view of the cutting mechanism 60 when the movable cutter 62 is located at the cutter standby position P1, fig. 10 (C) is a partial bottom view of the cutting mechanism 60 when the movable cutter 62 is located at the line catching position P3, fig. 10 (D) is a partial bottom view of the cutting mechanism 60 when the movable cutter 62 is located at the movable position P6, fig. 10 (E) is a partial bottom view of the cutting mechanism 60 when the movable cutter 62 is located at the stop position P5, and fig. 10 (F) is a partial bottom view of the cutting mechanism 60 when the movable cutter 62 is located at the cutting position P4.

Fig. 11 (a) is a bottom view of a part of the cutting mechanism 60 and a part of the needle thread holding mechanism 80 when the second holding member 82 is located at the standby position Q1, fig. 11 (B) is a bottom view of a part of the cutting mechanism 60 and a part of the needle thread holding mechanism 80 when the second holding member 82 is located at the holding position Q2, and fig. 11 (C) is a bottom view of a part of the cutting mechanism 60 and a part of the needle thread holding mechanism 80 when the second holding member 82 is located at the needle thread cutting position Q3.

Fig. 12 (a) is a cross-sectional view taken along line G1-G1 of fig. 11 (a), fig. 12 (B) is a cross-sectional view taken along line G2-G2 of fig. 11 (B), and fig. 12 (C) is a cross-sectional view taken along line G3-G3 of fig. 11 (C).

Fig. 13 (a) is a cross-sectional view taken along line F1-F1 of fig. 11 (a), fig. 13 (B) is a cross-sectional view taken along line F2-F2 of fig. 11 (B), and fig. 13 (C) is a cross-sectional view taken along line F3-F3 of fig. 11 (C).

Fig. 14 is a diagram showing a relationship between the angle of the main shaft of the final needle and the angle of the output shaft of the motor 59.

Description of the reference numerals

1. A sewing device; 5. a cloth feeding device; 11. a needle plate; 12. rong Zhenkong; 14. a needle bar; 15. a needle; 30. a needle bar mechanism; 41. a CPU; 59. a motor; 60. a cutting mechanism; 61. fixing the cutter; 62. a movable cutter; 67. a moving part; 69. a support shaft; 80. an upper thread holding mechanism; 81. a first holding member; 82. a second holding member; 84. a support section; 86. a first holding portion; 87. a second holding portion; 88. a penetration portion; p1, a cutter standby position; p3, line capture position; p4, cutting position; p5, stopping position; p6, a movable position; q1, standby position; q2, hold position; u, upper thread end.

Detailed Description

Embodiments of the present invention will be described. In the following description, the left and right, front and back, and up and down as indicated by arrows in the figures are used. The left-right direction, the front-rear direction, and the up-down direction of the sewing device 1 are the X-axis direction, the Y-axis direction, and the Z-axis direction, respectively.

The structure of the suture device 1 will be described with reference to fig. 1. The sewing device 1 is capable of sewing in the 360 degree direction by conveying the sewing object 19 relative to the needle 15 in the X-axis direction and the Y-axis direction. The sewn material 19 is, for example, cloth, leather, or the like. The sewing device 1 includes a seat portion 2, a stay portion 3, a arm portion 4, a cloth feeder 5, a control portion 10 (see fig. 8), and an operation panel 18. The seat 2 is provided on the sewing machine 6. The base 2 has an operation table 7 on the front side of the upper surface. The console 7 includes a needle plate 11 at a substantially center. A needle receiving hole 12 is formed in a substantially center of the needle plate 11. The sewing device 1 includes a lower shaft and a swing vertical shuttle, not shown, inside the housing 2. The swing vertical shuttle is disposed below the needle plate 11, and the lower shaft extends in the front-rear direction. The front end of the lower shaft is connected with the swinging vertical shuttle. The swing vertical shuttle accommodates a bobbin around which a bobbin thread 29 (see fig. 13) is wound and swings reciprocally about a lower shaft.

The pillar portion 3 extends upward from the rear portion of the seat portion 2. The arm portion 4 extends forward from the upper portion of the pillar portion 3, and supports the main shaft rotatably therein. The main shaft extends in the front-rear direction and is connected to a main motor 17 (see fig. 8) provided inside the arm portion 4. The link extends in the up-down direction inside the pillar portion 3. The main shaft is connected with the lower shaft through a connecting rod. Therefore, when the main motor 17 is driven, the main shaft rotates, and the vertical shuttle is oscillated to drive the main shaft. The sewing machine 6 is provided with an operation panel 18 on the right side of the upper surface. The operation panel 18 is, for example, a touch panel, and includes the display unit 13 and the input unit 16. The display unit 13 displays various information, and the input unit 16 receives input of various information such as an instruction to start sewing.

The arm portion 4 includes a needle bar mechanism 30 (see fig. 8) therein. The needle bar mechanism 30 has a needle bar 14, the needle 15 can be attached to the lower end of the needle bar 14, and the needle bar mechanism 30 swings the needle bar 14 in the up-down direction in accordance with the rotation of the spindle. The arm portion 4 has a distal end portion 8 at a distal end portion. The lower end of the tip portion 8 is opposed to the upper surface of the needle plate 11. The distal end portion 8 supports the needle bar 14 and the plunger 20 so that the needle bar 14 and the plunger 20 can move up and down. The needle bar 14 extends in the up-down direction and protrudes downward from the distal end portion 8. The needle bar 14 mounts a needle 15 at a lower end. The needle 15 has an eye, and holds the upper thread 28 by passing the upper thread 28 (see fig. 12) through the eye. The needle bar 14 is coupled to the main shaft. When the needle bar 14 moves up and down by the rotation of the main shaft, the needle 15 moves up and down and passes through the needle accommodating hole 12. The needle 15, which moves up and down, forms a stitch on the sewn article 19 in cooperation with the oscillating vertical shuttle. The presser bar 20 extends in the up-down direction on the left side of the needle bar 14 and protrudes downward from the distal end portion 8. The presser bar 20 is provided with a presser foot 9 at the lower end. The presser foot 9 intermittently presses the sewn article 19 downward.

The cloth feeding device 5 feeds the sewn article 19 in at least one direction with respect to the needle bar mechanism 30. The cloth feeding device 5 includes an X motor 21 (see fig. 8), a cloth holder 22, a support 23, a lever 24, a Y motor 25 (see fig. 8), and the like. The cloth feeding device 5 includes an X guide rail, an X moving plate, a Y guide rail, and a Y moving plate, which are not shown. The X motor 21 is provided at the rear side of the interior of the base 2. The X rail extends in the X axis direction in front of the X motor 21 inside the housing 2. The X moving plate is connected to the X rail so as to be movable in the left-right direction and to the X motor 21. The X moving plate moves left and right along the X guide rail by the driving force of the X motor 21. The Y guide rail is fixed on the upper surface of the X moving plate and extends along the Y axis direction. The Y guide rail moves left and right integrally with the X moving plate. The Y moving plate is connected to the Y rail so as to be movable back and forth with respect to the Y rail. The cloth holder 22 is fixed to the upper surface of the Y moving plate. The cloth holder 22 moves in the front-rear direction integrally with the X moving plate and the Y moving plate while moving in the left-right direction integrally with the Y moving plate. Accordingly, the cloth holder 22 can move in the horizontal direction. The support 23 is connected to the rear portion of the pressing arm 32 of the cloth holder 22. The support portion 23 can move left and right together with the cloth holder 22. The lever portion 24 extends rearward from the support portion 23 to the inside of the pillar portion 3, and is movable forward and backward. The front end portion of the lever portion 24 is connected to the support portion 23 via a slider. The Y motor 25 is provided inside the pillar portion 3 and is connected to the rod portion 24. When the lever portion 24 moves forward and backward by the driving force of the Y motor 25, the support portion 23, the cloth holder 22, and the Y moving plate integrally move forward and backward.

The cloth holder 22 includes a cloth feed plate 31, a pressing arm 32, a pair of connecting portions 33, a pressing frame 34, a pair of cylinders 35 (only one of which is shown in fig. 1), and the like. The cloth feed plate 31 extends forward from the upper surface of the Y moving plate, and includes a clamp frame 36 at the front end. The holding frame 36 has a rectangular frame shape in plan view, and can support the sewn product 19. The pressing arm 32 extends upward from the rear end portion of the cloth feed plate 31, and further extends in a curved manner toward the front side. The pressing arm 32 sandwiches and fixes the rear end of the cloth feed plate 31 between the pressing arm and the upper surface of the Y moving plate. The distal end 37 of the pressing arm 32 has a substantially rectangular shape in front view. The pair of coupling portions 33 are arranged in the left-right direction at the tip end portion 37 and are movable up and down. The pair of connecting portions 33 support the pressing frame 34. The pressing frame 34 has a substantially rectangular frame shape in plan view, and faces the holding frame 36 in the up-down direction. A pair of cylinders 35 are provided at left and right portions of the pressing arm 32. The pair of cylinders 35 are connected to the pair of connecting portions 33, respectively. When the pair of cylinders 35 are driven to move the pair of coupling portions 33 up and down, the pressing frame 34 moves up and down between the gripping position and the separating position. The holding position is a position where the sewn product 19 supported by the holding frame 36 is pressed from above. The separation position is a position separated upward from the sewn article 19. The sewing device 1 can perform sewing in the 360-degree direction by moving the cloth holder 22 holding the sewing object 19 relative to the needle 15 in the X-axis direction and the Y-axis direction.

As shown in fig. 2, the sewing apparatus 1 includes a cutting mechanism 60 and a knitting yarn holding mechanism 80 below the needle plate 11. The cutting mechanism 60 is driven by the power of the motor 59, and cuts the upper thread 28 and the lower thread 29 at the end of the sewing operation. The needle thread holding mechanism 80 is driven by the power of the motor 59, and holds an end portion U (see fig. 12) of the needle thread 28 passing through the needle 15 so as to be releasable below the needle plate 11. The upper thread holding mechanism 80 bends and holds the upper thread 28 passing through the lower side of the sewn article 19 with the first needle at the start of sewing. Accordingly, the upper thread holding mechanism 80 prevents the thread from being detached from the needle 15. The sewing device 1 fixes a motor 59 on the back side of the base 2. The motor 59 is a pulse motor, and is a driving source of the cutting mechanism 60 and the noodle wire holding mechanism 80.

As shown in fig. 2 to 5, the cutting mechanism 60 includes a fixed cutter 61, a movable cutter 62, a biasing member 65, a support shaft 69, and a moving portion 67. As shown in fig. 3, the fixed cutter 61 is fixed to the lower side of the needle plate 11, and a needle hole 12 through which the needle 15 of the sewing device 1 passes is formed in the needle plate 11. The fixed cutter 61 is substantially L-shaped in plan view, and is fixed to the lower surface of the needle plate 11 by two screws 611. The fixed cutter 61 includes a blade portion 612. The blade 612 is provided at the right rear portion of the fixed cutter 61 and extends from the left side of the pinhole 12 toward the front of the pinhole 12.

The movable cutter 62 is provided so as to be horizontally rotatable with respect to the fixed cutter 61. The movable cutter 62 includes a branching portion 621, a blade portion 622, a wire engaging portion 623, a wire guide portion 624, a wire catching portion 625, a wire holding portion 66, a wire releasing portion 68, and the like. The branching portion 621 has a tip end portion tapered rearward, and is a portion that enters the needle thread loop formed by the needle thread 28. The blade 622 is an end portion of a through hole penetrating the movable cutter 62 in the up-down direction, the through hole being circular in a top view. The wire engaging portion 623 is a portion of the thread loop on the side extending from the needle 15. The wire guide 624 is a portion bent between the wire branching portion 621 and the wire catching portion 625 on the opposite side of the pin 763 of the link 76 from the support shaft 69. The thread guide 624 guides the thread loop extending from the sewn article 19 to the thread catching portion 625. The wire capturing portion 625 is a portion for capturing the face wire loop.

The wire holding portion 66 is a portion of the lower surface of the movable cutter 62 that can hold the wire end D (see fig. 13 a) of the wire 29 cut by the movable cutter 62 between the lower surface and the biasing member 65. The wire releasing portion 68 is a portion of the lower surface of the movable cutter 62 where the bottom wire end D cannot be held between the lower surface and the biasing member 65. The wire releasing portion 68 is a portion of the lower surface of the portion of the movable cutter 62 sandwiched between the branching portion 621 and the wire catching portion 625, which is in contact with the wire catching portion 625, and is a concave portion provided adjacent to the wire holding portion 66 and recessed upward. That is, the wire holding portion 66 is located below the wire releasing portion 68.

The movable cutter 62 is formed with penetration portions 626 and 627. The penetrating portion 626 is a hole penetrating in the up-down direction provided at an end portion of the movable cutter 62 on the opposite side to the side where the branching portion 621 is provided (in the position of fig. 3, the rear end portion of the movable cutter 62). The penetrating portion 626 is penetrated by a pin 763 of a link 76 described later. The through-hole 627 is a vertically penetrating hole provided in the center portion of the movable cutter 62 in the longitudinal direction. The support shaft 69 penetrates the penetration portion 627, is fixed to the lower surface of the needle plate 11, and supports the movable cutter 62 so that the movable cutter 62 can reciprocate in a horizontal direction parallel to the needle plate 11. The support shaft 69, which is the rotation center of the movable cutter 62, is provided on the opposite side of the needle hole 12 from the motor 59 side in the front-rear direction in the present embodiment in the direction from the motor 59 toward the needle hole 12 on the surface parallel to the needle plate 11. Fulcrum 69 is located to the right of screw 611.

As shown in fig. 4, the biasing member 65 is fixed to the lower side of the needle plate 11 by two screws 651 at a position forward of the needle hole 12. The urging member 65 is a curved plate spring. The biasing member 65 includes a fixing portion 652, a pressing portion 653, a guide portion 654, and a guide portion 655. The fixing portion 652 is formed in a plate shape extending from the front to the right of the needle hole 12 and parallel to the needle plate 11, and the fixing portion 652 is fixed to the needle plate 11 by two screws 651. The pressing portion 653 is a portion bent downward from the left rear end portion of the fixing portion 652 and then bent rearward in a letter U shape in bottom view. The pressing portion 653 is inclined slowly toward the rear lower side. As shown in fig. 13 (a), the guide portion 654 is inclined so as to be downward toward the rear in the rear of the pressing portion 653. The guide portion 655 is a portion bent upward from the left end of the guide portion 654. The guide portions 654 and 655 guide the movement of the movable cutter 62 so as to be disposed between the urging member 65 and the needle plate 11. The urging member 65 can urge the wire holding portion 66 of the movable cutter 62 upward.

As shown in fig. 2, the moving unit 67 includes a motor 59, and rotates the movable cutter 62 in the horizontal direction by power of the motor 59. The moving unit 67 includes a motor 59, a cam plate 70, and a link mechanism 72. The motor 59 is a pulse motor, and is fixed to the lower back surface of the base 2 in a posture in which the output shaft 98 faces downward (see fig. 1). The cam plate 70 converts the rotational force of the output shaft 98 of the motor 59 into power that drives the link mechanism 72. The link mechanism 72 drives the movable cutter 62 of the cutting mechanism 60 according to the rotation direction and angle of the cam plate 70 to cut the upper thread 28 and the lower thread 29. The link mechanism 72 drives the second holding member 82 of the needle thread holding mechanism 80 according to the rotation direction and angle of the cam plate 70 and holds the needle thread end U at a predetermined period at the start of sewing.

As shown in fig. 6, the cam plate 70 is disposed below the motor 59 and fixed to the distal end portion of the output shaft 98 of the motor 59. The cam plate 70 is formed in a substantially semicircular shape in bottom view, and has a shaft hole 701 formed in the center. The distal end portion of the output shaft 98 of the motor 59 is inserted into and fixed to the shaft hole 701. The cam plate 70 rotates integrally with the output shaft 98. The cam plate 70 includes the grooved cam 71 within a range of about 180 degrees around the shaft hole 701. The groove cam 71 is formed in a groove shape having a semicircular arc shape in plan view and having a lower surface of the cam plate 70 recessed in the thickness direction.

As shown in fig. 2 and 6, the link mechanism 72 includes links 73 to 76 and a roller member 77. The links 73 to 76 are arranged in order from the motor 59 side toward the cutting mechanism 60 side. The link 73 has a substantially L-shaped plate shape in plan view, and is disposed below the cam plate 70. The link 73 rotatably fixes the roller member 77 on the upper side of the one end 731. The roller member 77 includes a rotation shaft extending in the up-down direction. The roller member 77 engages with the groove cam 71 of the cam plate 70. The link 73 is provided with a shaft hole 734 at a central portion 733, and the central portion 733 is bent at a substantially right angle between one end 731 and the other end 732. Since the support shaft 735 is inserted into the shaft hole 734, the link 73 can rotate about the support shaft 735. The roller member 77 engages with the groove cam 71 of the cam plate 70. The other end 732 of the link 73 is rotatably coupled to an end 741 of the link 74 via a pin 736.

The link 74 is rod-shaped extending in the front-rear direction. The other end 742 of the link 74 is secured to an end 751 of the link 75 by a screw 743. The link 75 is a plate member having a letter C shape that is open to the right in a front view. The other end 752 of the link 75 is positioned above the one end 751 and is fixed to the one end 761 of the link 76 by a screw 744. A vertically extending center portion 753 of the link 75 is penetrated by a vertically extending support shaft 754. The link 75 is rotatable about the support shaft 754. The link 76 extends in the front-rear direction. As shown in fig. 3 and 4, the other end 762 of the link 76 bulges in a substantially circular arc shape to the right. The other end 762 of the link 76 has pins 763, 764 protruding upward. The pin 763 is provided at the distal end portion of the link 76, and penetrates the penetration portion 626 of the movable cutter 62. The movable cutter 62 is coupled to the link 76 by a pin 763 of the link 76. The pin 764 is provided at a position rearward of the pin 763, and penetrates a penetrating portion 861 of a second holding member 82 of the needle thread holding mechanism 80 described later. The second holding member 82 is coupled to the link 76 by a pin 764 of the link 76. The link 76 is located below the second retaining member 82 and the movable cutter 62.

The moving unit 67 moves the link 76 in the front-rear direction by the power of the motor 59, and thereby can rotate the movable cutter 62 in the horizontal direction parallel to the needle plate 11 about the support shaft 69. The moving unit 67 can move the movable cutter 62 to the cutter standby position P1, the release position P2, the wire catching position P3, the cutting position P4, the stop position P5, and the movable position P6 shown in fig. 5, respectively, in response to the driving of the motor 59. In fig. 5, the movable blade 62 is shown in position at the blade 622, except for the fixed blade 61, the movable blade 62, and the link 76.

The tool standby position P1 is a position where the movable tool 62 is located at a position separated from the fixed tool 61, and the wire holding portion 66 of the movable tool 62 is disposed between the needle plate 11 and the urging member 65 so as to face the urging member 65, and the wire holding portion 66 can hold the bobbin thread end portion D together with the urging member 65. The release position P2 is a position where the wire release portion 68 of the movable cutter 62 is disposed between the needle plate 11 and the biasing member 65 so as to face the biasing member 65. The thread catching position P3 is a position where the movable cutter 62 catches the upper thread 28 located near the needle accommodating hole 12. In bottom view, the line capture position P3 is located between the pinhole 12 and the release position P2. The cutting position P4 is a position where the movable cutter 62 intersects the fixed cutter 61 to cut the upper thread 28 and the lower thread 29. The stop position P5 is a position immediately before the upper thread 28 and the lower thread 29 are cut by the movable cutter 62. As shown in fig. 10 (E), the stop position P5 of the present embodiment is a position immediately before cutting, in which the distance E in the horizontal direction from the tip of the blade portion 612 of the fixed blade 61 to the tip of the blade portion 622 of the movable blade 62 is within 5 mm. The blade 622 of the present embodiment is circular in a plan view, and cuts the upper thread 28 and the lower thread 29 while moving forward after the movable cutter 62 moves to the movable position P6. Therefore, the tip of the blade 622 of this embodiment is the tip portion of the blade 622. The stop position P5 is a position located rearward and rightward of the cutting position P4 on the movement path J1 of the movable cutter 62 that is a position near the front of the movable position P6 when the movable position P6 is directed toward the cutting position P4. The movable position P6 is a position opposite to the cutter standby position P1 with respect to the cutting position P4. That is, the movable position P6 is located in the counterclockwise direction with respect to the cutting position P4 about the support shaft 69, and the tool standby position P1 is located in the clockwise direction with respect to the cutting position P4 about the support shaft 69. On the moving rail J1 of the movable cutter 62, the cutting position P4 is located between the cutter standby position P1 and the movable position P6, and the release position P2 is located between the cutter standby position P1 and the cutting position P4. The main process of the sewing device 1 for moving the movable cutter 62 to each position will be described later.

As shown in fig. 2 to 4 and 7, the needle thread holding mechanism 80 includes a first holding member 81, a second holding member 82, and a moving portion 67. The needle thread holding mechanism 80 of the present embodiment further includes a fixed blade 97. The moving part 67 is common to the cutting mechanism 60. The first holding member 81 is provided below the needle plate 11, and a needle accommodating hole 12 through which the needle 15 of the sewing device 1 passes is formed in the needle plate 11. The first holding member 81 is a plate-like member extending in the horizontal direction parallel to the needle plate 11 and long in the left-right direction. The first holding member 81 extends in the horizontal direction at a position below the wire guide portion 624 of the movable cutter 62. The first holding member 81 is disposed on the left side with respect to the needle hole 12, and is fixed to the lower side of the needle plate 11 by a pair of front and rear screws 811. The right end portion of the first holding member 81 is inclined rearward as it is located on the right side. As shown in fig. 13 (a), the first holding portion 86 of the second holding member 82 is disposed on the same horizontal plane as the movable cutter 62. Here, the same horizontal plane means an arbitrary virtual horizontal plane passing through both the first holding portion 86 and the movable cutter 62, and the extending range of the first holding portion 86 in the up-down direction and the extending range of the movable cutter 62 in the up-down direction overlap at least partially.

As shown in fig. 2 to 4 and fig. 7, the second holding member 82 holds the needle thread end U of the needle thread 28 in cooperation with the first holding member 81. The second holding member 82 includes a first holding portion 86, a second holding portion 87, and a support portion 84. The first holding portion 86 is provided below the needle plate 11 and above the first holding member 81. The first holding portion 86 has a plate shape long in the front-rear direction, and a penetration portion 88 allowing the needle 15 to pass through when the second holding member 82 is located at the standby position Q1 of fig. 7 is formed in the first holding portion 86. The first holding portion 86 has penetrating portions 861, 863 and a pair of screw holes 862. The penetrating portion 861 is a hole penetrating in the up-down direction provided at an end portion of the first holding portion 86. The pin 764 of the link 76 is inserted through the insertion portion 861. The penetration portion 863 is a hole penetrating in the vertical direction provided in front of the penetration portion 861. The second holding member 82 is rotatably supported by a support portion 84 penetrating through a penetrating portion 863 of the first holding portion 86 in a horizontal direction parallel to the needle plate 11. The support portion 84 is a pin member provided perpendicularly to the needle plate 11. The second holding member 82 is rotatably supported by a support portion 84 penetrating the first holding portion 86 in a horizontal direction parallel to the needle plate 11. The support portion 84 is provided behind the receiving hole 12. That is, the support portion 84 is provided on the motor 59 side with respect to the needle hole 12 in the front-rear direction in the present embodiment in the direction from the motor 59 toward the needle hole 12 and in the opposite direction to the direction from the motor 59 on the surface parallel to the needle plate 11. The distance between the center of the support shaft 69 and the center of the pin 764 is shorter than the distance between the center of the support portion 84 and the center of the pin 764. Therefore, the amount of rotation of the movable cutter 62 with respect to the amount of movement of the link 76 is larger than the amount of rotation of the second holding member 82 with respect to the amount of movement of the link 76.

The second holding portion 87 is plate-shaped and long in the front-rear direction, and is provided below the first holding member 81. The length of the second holding portion 87 in the front-rear direction is shorter than the length of the first holding portion 86 in the front-rear direction. The second holding portion 87 is formed with a penetration portion 89 that allows the needle 15 to pass through when the second holding member 82 is located at the standby position Q1. The second holding portion 87 has two holes 872 formed therethrough in the vertical direction. The second holding portion 87 is fixed to the lower surface of the first holding portion 86 by a screw 871 penetrating the hole 872 in a state of overlapping with the first holding portion 86. At this time, the second holding portion 87 is located forward of the support portion 84. The penetrating portions 88, 89 of the present embodiment are notches open to the left, and the outline of the penetrating portions 88, 89 in a plan view overlaps each other. The penetrating portions 88, 89 are formed on the opposite side of the second holding member 82 to the penetrating portion 861 side with respect to the supporting portion 84. The second holding portion 87 is not movable relative to the first holding portion 86, and the second holding portion 87 moves in the horizontal direction together with the first holding portion 86. As shown in fig. 12 (a), the thickness of the first holding portion 86 and the second holding portion 87 is larger than the thickness of the first holding member 81. The thickness of the first holding portion 86 is greater than the thickness of the second holding portion 87.

As shown in fig. 3, the fixed blade 97 is fixed to the lower side of the needle plate 11, and a needle accommodating hole 12 through which the needle 15 passes is formed in the needle plate 11. The fixed blade 97 includes a blade portion 96. The blade 96 is provided on the right side of the fixed blade 97, and is disposed on the left side of the pinhole 12. As shown in fig. 12 (a), the right end of the blade 96 is inclined downward and rightward. The fixed blade 97 includes a pair of front and rear holes 971 penetrating in the vertical direction. The fixed blade 97 is located above the first holding member 81. The fixed blade 97 is fixed to the lower side of the needle plate 11 together with the first holding member 81 by a screw 811 penetrating through a pair of holes 971.

The moving portion 67 is coupled to the second holding member 82 by penetrating the pin 764 of the link 76 into the penetrating portion 861 of the second holding member 82. The moving portion 67 moves the link 76 back and forth by the power of the motor 59, and thereby rotates the second holding member 82 in the horizontal direction parallel to the needle plate 11 centering on the supporting portion 84. That is, the moving portion 67 can move the movable cutter 62 and the second holding member 82, respectively. Specifically, the moving unit 67 moves the second holding member 82 to the standby position Q1, the holding position Q2, the upper thread cutting position Q3, the cutting position Q4, and the movable end position Q5 shown in fig. 7. In fig. 7, the positions of the second holding members 82 are shown in positions of imaginary circles inscribed in the circular-arc-shaped right end portions of the penetrating portions 89, excluding the first holding portions 86, the second holding portions 87, the supporting portions 84, the fixed knife 97, and the links 76, from being illustrated.

The standby position Q1 is a position where the pin hole 12 is arranged between the first holding member 81 and the second holding member 82 in the horizontal direction. The holding position Q2 is a position where the second holding member 82 is separated from the receiving hole 12 in the horizontal direction and the second holding member 82 overlaps the first holding member 81 in the up-down direction. The upper thread cutting position Q3 is a position at which the upper thread end U held by the first holding member 81 and the second holding member 82 is cut by the fixed knife 97. On the moving rail J2 of the second holding member 82, the holding position Q2 is located between the standby position Q1 and the upper thread cutting position Q3. The cutting position Q4 and the movable end position Q5 are positions corresponding to the cutting position P4 and the movable position P6 of the movable cutter 62, respectively. The main process of the sewing device 1 to move the second holding member 82 to each position will be described later.

The electrical structure of the sewing device 1 will be described with reference to fig. 8. The control unit 10 of the sewing apparatus 1 includes a CPU41, a ROM42, a RAM43, a storage device 45, an I/O interface (hereinafter referred to as I/O) 46, and driving circuits 51 to 56. The CPU41 controls the operation of the sewing device 1. The CPU41 is connected to the ROM42, the RAM43, the storage device 45, and the I/O46. The ROM42 stores programs and the like for executing various processes such as a main process (see fig. 9) described later. The RAM43 temporarily stores various information. The storage device 45 is a nonvolatile device, and stores sewing information and the like. The sewing information is information including needle falling points.

The I/O46 is connected to the driving circuits 51 to 56 and the input unit 16. The drive circuit 51 is connected to the main motor 17. The drive circuit 52 is connected to the X motor 21. The driving circuit 53 is connected to the Y motor 25. The drive circuit 56 is connected to a motor 59. The X motor 21, Y motor 25, and motor 59 are pulse motors. The driving circuit 54 is connected to the pair of cylinders 35. The driving circuit 55 is connected to the display unit 13. The CPU41 controls the driving circuits 51 to 54 to drive the main motor 17, the X motor 21, the Y motor 25, and the pair of cylinders 35. The CPU41 controls the display section 13 by controlling the driving circuit 55. The input unit 16 detects information input by the operator, and outputs the detection result to the CPU41 via the I/O46.

The encoders 91 to 93 are connected to the main motor 17, the X motor 21, and the Y motor 25, respectively. The encoder 91 detects the rotational position of the output shaft of the main motor 17. The encoder 92 detects the rotational position of the output shaft of the X motor 21. The encoder 93 detects the rotational position of the output shaft of the Y motor 25. The encoders 91 to 93 output the detection results to the CPU41 via the I/O46.

The main process performed by the sewing apparatus 1 will be described with reference to fig. 9 to 14. In the main process, a process of forming stitches on the sewn object 19 is performed according to the sewing pattern. When the power of the sewing apparatus 1 is turned on, the CPU41 starts the main process. When the power of the sewing apparatus 1 is turned on, the CPU41 reads out a program for executing main processing stored in a program storage area of the ROM42 to the RAM43. The CPU41 executes the following steps according to instructions contained in the program read out to the RAM43. The procedure is abbreviated as S hereinafter. Various parameters necessary for performing the main processing are stored in the storage device 45. Various data obtained during the main processing are appropriately stored in the RAM43. In fig. 14, regarding the change in the angle of the output shaft of the motor 59, the clockwise rotation is shown as a positive change in the angle, and the counterclockwise rotation is shown as a negative change in the angle.

As shown in fig. 9, the CPU41 determines whether or not an origin detection instruction is detected (S1). The operator operates the input unit 16 to input an origin detection instruction. When the origin detection instruction is not detected (S1: no), the CPU41 returns the process to S1. When the origin detection instruction is detected (S1: yes), the CPU41 performs origin detection, acquires an initial value of a predetermined distance (S2), and thereafter, lifts the presser foot 9 (S3). The predetermined distance is used to define the cut lengths of the upper thread 28 and the lower thread 29 extending from the final stitch. The initial value of the predetermined distance may be set by any method, may be automatically set according to the sewing pattern, may be a constant value irrespective of the sewing pattern, or may be a value set in S22 (described later) of the previous main process.

The operator sets the sewn article 19 between the cloth holders 22, operates the input unit 16, and inputs a lowering instruction of the presser foot 9. The CPU41 determines whether or not a lowering instruction of the presser foot 9 is detected (S4). When the down instruction is not detected (S4: no), the CPU41 returns the process to S4. When the lowering instruction is detected (S4: yes), the CPU41 lowers the presser foot 9 (S5). As shown in fig. 10 (B) and 11 (a), the movable cutter 62 of the cutting mechanism 60 is located at the cutter standby position P1, and the second holding member 82 of the upper thread holding mechanism 80 is located at the standby position Q1. That is, when the second holding member 82 is located at the standby position Q1, the movable cutter 62 is located at the cutter standby position P1. The first holding member 81 and the second holding member 82 partially overlap in the up-down direction when viewed from the bottom. In a bottom view, the receptacle hole 12 is surrounded by the first holding member 81 and the second holding member 82. The blade 622 of the movable cutter 62 is located near the boundary between the guide portion 654 and the pressing portion 653. As shown in fig. 12 (a), the second holding member 82 of the needle-thread holding mechanism 80 is separated from the needle-thread end U. The upper thread end U located below the needle-receiving hole 12 is surrounded by the first and second holding members 81 and 82. As shown in fig. 13 (a), the wire holding portion 66 of the movable cutter 62 of the cutting mechanism 60 holds the bobbin thread end portion D in the up-down direction together with the urging member 65. The upper end of the pressing portion 653 of the urging member 65 abuts the wire holding portion 66 of the movable cutter 62.

The CPU41 determines whether or not a sewing instruction is detected (S6). The operator operates the input unit 16 to input a sewing instruction. When the sewing instruction is not detected (S6: NO), the CPU41 judges whether or not an input instruction to input a predetermined distance is detected based on the detection result of the input section 16 (S21). The predetermined distance when the input instruction is not detected is the initial value acquired in S2. In the case where the input instruction is detected (S21: yes), the CPU41 sets a predetermined distance according to the input instruction (S22). When the input instruction is not detected (S21: no), or after S22, the CPU41 returns the process to S6.

When the sewing instruction is detected (S6: yes), the CPU41 drives the main motor 17 to start sewing of the sewing pattern (S7). The CPU41 determines whether or not it is the upper thread retaining timing based on the detection result of the encoder 91 (S8). The needle thread holding timing of the sewing device 1 of the present embodiment is set to be after the first needle is sewn and before the second needle is sewn. When it is not the upper thread holding timing (S8: no), the CPU41 returns the process to S8. When the upper thread holding timing is established (S8: yes), the CPU41 moves the second holding member 82 from the standby position Q1 to the holding position Q2 (S9). Specifically, the CPU41 drives the motor 59 to rotate the output shaft 98 of the motor 59 in the clockwise direction as viewed from above. The roller member 77 moves relatively from the left end portion of the slot cam 71 to a position rotated counterclockwise as viewed from the bottom. The link 73 rotates counterclockwise as viewed from above about the support shaft 735, and moves the links 74 to 76. As shown in fig. 11 (B), the movable cutter 62 of the cutting mechanism 60 moves rearward of the cutter standby position P1, and the second holding member 82 of the upper thread holding mechanism 80 moves from the standby position Q1 to the holding position Q2. The second holding member 82 is separated from the receiving hole 12 in the horizontal direction, and the second holding member 82 overlaps the first holding member 81 in the up-down direction. As shown in fig. 12 (B), the needle thread holding mechanism 80 holds the needle thread end U in a state of being bent in a letter S shape when seen from the side between the first holding member 81 and the second holding member 82. As shown in fig. 13 (B), the wire holding portion 66 of the movable cutter 62 of the cutting mechanism 60 maintains a state of holding the base wire end portion D in the up-down direction together with the urging member 65.

The CPU41 determines whether or not it is the upper thread cutting timing based on the detection result of the encoder 91 (S10). The upper thread cutting timing of the sewing device 1 of the present embodiment may be set to a timing after S9. The timing of cutting the upper thread may be a predetermined timing after the upper thread holding control process and before the second needle is dropped, or after the upper thread holding control process and after the second needle is dropped. When it is not the upper thread cutting timing (S10: no), the CPU41 returns the process to S10.

When the needle thread holding timing is established (S10: yes), the CPU41 controls the motor 59 to move the second holding member 82 from the holding position Q2 to the needle thread cutting position Q3 after S9 (S12). The CPU41 controls the motor 59 to move the movable cutter 62 from the position (B) of fig. 11 to the release position P2 of fig. 10 (a), and releases the wire end D held in the process of S17 of the previous main process (S12). Specifically, the CPU41 drives the motor 59 to rotate the output shaft 98 of the motor 59 in the clockwise direction as viewed from above. The link 73 rotates counterclockwise as viewed from above about the support shaft 735, and moves the links 74 to 76. As shown in fig. 11 (C), the movable cutter 62 of the cutting mechanism 60 moves toward the release position P2, and the second holding member 82 of the needle thread holding mechanism 80 moves from the holding position Q2 toward the needle thread cutting position Q3. The state in which the second holding member 82 is separated from the receiving hole 12 in the horizontal direction and the second holding member 82 overlaps the first holding member 81 in the up-down direction is maintained. The second holding member 82 is overlapped with the blade portion 96 of the fixed blade 97 up and down. When the movable cutter 62 of the cutting mechanism 60 is positioned in the range from the cutter standby position P1 to the release position P2, the branching portion 621 of the movable cutter 62 is positioned forward of the pinhole 12.

As shown in fig. 12 (C), the upper thread holding mechanism 80 maintains a state in which the upper thread end U is bent in a letter S shape in side view between the first holding member 81 and the second holding member 82, and the first holding portion 86 of the second holding member 82 overlaps the fixed blade 97 in the up-down direction. Thereby, the upper thread end U is cut by the fixed blade 97. The first holding member 81 and the second holding member 82 continue to hold the needle thread end U while the second holding member 82 moves from the holding position Q2 to the needle thread cutting position Q3. Accordingly, the upper thread end U is cut by the fixed blade 97 in a state of being held by the first holding member 81 and the second holding member 82. The cutting position of the fixed blade 97 for cutting the upper thread 28 is a position on the upstream side of the upper thread 28, i.e., an upper portion, than the position where the upper thread 28 is held by the first holding member 81 and the second holding member 82. As shown in fig. 13 (C), the wire releasing portion 68 of the movable cutter 62 of the cutting mechanism 60 is separated from and opposed to the pressing portion 653 of the urging member 65 in the up-down direction. The wire holding portion 66 moves to a state of being retracted from the pressing portion 653 of the biasing member 65, and releases the state of holding the base wire end portion D together with the biasing member 65 in the up-down direction. Accordingly, the upper thread end portion U held by the upper thread holding mechanism 80 at the start of sewing is released after being cut near the needle hole 12, and the held lower thread end portion D is released by the cutting mechanism 60.

The CPU41 drives the motor 59 to move the movable cutter 62 of the cutting mechanism 60 to the cutter standby position P1 and to move the second holding member 82 of the upper thread holding mechanism 80 to the standby position Q1 (S13). The CPU41 determines whether or not the next needle falling operation of the needle 15 is the final needle of the sewing operation and is the timing T3 of performing the thread catching process (S14). The CPU41 counts the number of stitches of the sewing pattern in the current sewing process and stores the count in the RAM43. Accordingly, the CPU41 can determine whether or not the next needle falling operation is the final needle by referring to the sewing information of the sewing pattern stored in the ROM 42. As shown in fig. 14, the timing T3 at which the thread catching process is performed is set to be within the period T1 during the final sewing process. The CPU41 can determine whether or not it is the timing T3 by the detection result of the encoder 91 at the time of sewing the final needle.

If the time T3 is not set (S14: no), the CPU41 returns to S14 and continues the sewing operation. When the timing T3 is set (yes in S14), the CPU41 performs the line capturing process as follows: in accordance with the stitch forming the final needle on the sewn article 19, the motor 59 is driven to move the movable cutter 62 from the cutter standby position P1 in fig. 10 (B) and 11 (a) to the thread catching position P3 in fig. 10 (C), and further to the movable position P6 in fig. 10 (D) on the opposite side of the thread catching position P3 from the cutter standby position P1 (S15). As shown in fig. 14, the CPU41 moves the movable cutter 62 from the cutter standby position P1 to the wire capturing position P3 during the period from the timing T3 to the timing T4, and moves the movable cutter 62 from the wire capturing position P3 to the movable position P6 during the period from the timing T4 to the timing T5. The moving speed of the movable cutter 62 in the period from the timing T3 to the timing T4 is set to be smaller than the moving speed of the movable cutter 62 in the period from the timing T4 to the timing T5. The CPU41 stops the movement of the movable cutter 62 from the timing T5 to the timing T6 at the movable position P6.

The CPU41 controls the motor 59 so that the absolute value of the moving speed of the movable cutter 62 from the movable position P6 to the cutting position P4 until the upper thread 28 and the lower thread 29 are cut is smaller than the absolute value of the moving speed of the movable cutter 62 in the thread catching process from the timing T3 to the timing T5, and so that the movable cutter 62 is moved to the stop position P5 to stop the movable cutter 62 at the stop position P5 between the movable position P6 and the cutting position P4 for a predetermined period shown in fig. 10 (S16). The CPU41 of the present embodiment controls the motor 59 so that the absolute value of the moving speed of the movable cutter 62 from the timing T6 to the timing T9 is smaller than the absolute value of the moving speed in the line capturing process of the movable cutter 62 from the timing T3 to the timing T5. The predetermined period for stopping at the stop position P5 may be changed according to the predetermined distance S2 or S22, and is a period from the timing T7 to the timing T9 in the present embodiment.

The CPU41 stops the main motor 17 at timing T8 (S17). At timing T8, the lower end of needle 15 is positioned above sewn article 19. In fig. 14, since the main motor 17 is stopped at the timing T8, the angle of the main shaft does not change after the timing T8, but the main shaft is assumed to rotate at the same speed as in the sewing, and the angle of the motor 59 after the timing T8 is described. The CPU41 conveys the sewn product 19 by the cloth feeding device 5 by a predetermined distance while the movable cutter 62 is in a state of capturing the upper thread 28 by the thread capturing process and while the lower end of the needle 15 is located above the needle plate 11 (S18). The predetermined distance is the value acquired in S2 or the value set in S22. The conveying direction of S18 may be any direction. The conveying direction of S18 may be, for example, the extending direction of the stitch of the final needle. The CPU41 conveys the sewn article 19 a predetermined distance in a period T2 from the timing T8 to the timing T9. As shown in fig. 10 (F), the CPU41 drives the motor 59 to move the movable cutter 62 to the cutting position P4 to cut the upper thread 28 and the lower thread 29 (S19).

The CPU41 controls the motor 59 to move the movable cutter 62 from the cutting position P4 in fig. 10 (F) to the cutter standby position P1 in fig. 10 (B) and 11 (a), and clamps the wire end portion D cut in the wire cutting process with the biasing member 65 and the wire clamping portion 66 (S20). The CPU41 drives the motor 59, rotates the output shaft 98 of the motor 59 in the counterclockwise direction as viewed from above, and moves the movable cutter 62 from the cutting position P4 to the cutter standby position P1. The link 73 rotates clockwise in the bottom view about the support shaft 735, and moves the links 74 to 76. The movable cutter 62 is guided by the guide portions 654 and 655 of the biasing member 65 while the base thread end portion D cut in S19 is disposed on the thread holding portion 66 in the process of moving from the cutting position P4 to the cutter standby position P1, and the thread holding portion 66 is disposed between the biasing member 65 and the needle plate 11. As a result, as shown in fig. 13 (a), when the movable cutter 62 moves from the cutting position P4 to the cutter standby position P1, the wire end D is held between the wire holding portion 66 of the movable cutter 62 and the pressing portion 653 of the biasing member 65. Before S12 of the next main process is performed, the bobbin thread end portion D is gripped by the thread gripping portion 66 of the movable cutter 62 and the pressing portion 653 of the urging member 65. In the present embodiment, in S19 and S20, the movement from the stop position P5 of the movable cutter 62 to the cutter standby position P1 is continuously performed, and the cutting of the upper thread 28 and the lower thread 29 and the clamping of the lower thread end D are performed in a series of operations. The CPU41 ends the main processing so far.

In the above embodiment, the sewing device 1, the cloth feeding device 5, the needle plate 11, the needle accommodating hole 12, the needle bar 14, the needle 15, the input unit 16, the needle bar mechanism 30, the motor 59, the cutting mechanism 60, the fixed cutter 61, and the movable cutter 62 are examples of the sewing device, the conveying mechanism, the needle plate, the needle accommodating hole, the needle bar, the needle, the input unit, the needle bar mechanism, the motor, the cutting mechanism, the fixed cutter, and the movable cutter of the present invention, respectively. The urging member 65, the wire holding portion 66, the wire releasing portion 68, the wire holding mechanism 80, the first holding member 81, the second holding member 82, and the supporting portion 84 are examples of the urging member, the wire holding portion, the wire releasing portion, the wire holding mechanism, the first holding member 81, the second holding member, and the supporting portion, respectively, of the present invention. The moving portion 67 is an example of a tool moving portion and a holding moving portion of the present invention. The cutter standby position P1, the thread catching position P3, the cutting position P4, the stop position P5, the movable position P6, the standby position Q1, and the holding position Q2 are examples of the cutter standby position, the upper thread catching position, the cutting position, the stop position, the movable position, the standby position, and the holding position, respectively, of the present invention. The process of S7 is an example of the sewing process of the present invention. The process of S15 is an example of the line capturing process of the present invention. The process of S18 is an example of the length adjustment process of the present invention. The process of S19 is an example of the cutting process of the present invention. The process of S22 is an example of the distance setting process of the present invention.

The sewing device 1 of the above embodiment includes the needle bar mechanism 30, the needle plate 11, the cloth feeding device 5, the cutting mechanism 60, and the CPU41. The needle bar mechanism 30 has a needle bar 14, the needle 15 can be attached to the lower end of the needle bar 14, and the needle bar mechanism 30 swings the needle bar 14 in the up-down direction. Needle receiving holes 12 through which needles 15 pass are formed in the needle plate 11. The cloth feeding device 5 feeds the sewn article 19 in at least one direction with respect to the needle bar mechanism 30. The cutting mechanism 60 is capable of cutting the upper thread 28 and the lower thread 29, and the cutting mechanism 60 includes: a fixed cutter 61 fixed to the lower side of the needle plate 11; a movable cutter 62 provided rotatably in a horizontal direction with respect to the fixed cutter 61; and a moving unit 67 having a motor 59 and configured to rotate the movable cutter 62 in the horizontal direction by power of the motor 59. The CPU41 controls the needle bar mechanism 30, the cloth feeder 5, and the cutting mechanism 60. The CPU41 drives the needle bar mechanism 30 and the cloth feeding device 5 to form a stitch on the sewn product 19 by the upper thread 28 and the lower thread 29 (S7). The CPU41 drives the motor 59 in accordance with the formation of the stitch in which the sewing sequence is the last on the sewn material 19, and moves the movable cutter 62 from the cutter standby position P1 to the thread catching position P3 and further to the movable position P6 (S15), the cutter standby position P1 being a position where the movable cutter 62 is separated from the fixed cutter 61 in the horizontal direction, the thread catching position P3 being a position where the movable cutter 62 catches the upper thread 28 located near the needle hole 12, and the movable position P6 being located on the opposite side of the cutter standby position P1 from the thread catching position P3. The CPU41 conveys the sewn product 19 by the cloth feeding device 5 by a predetermined distance while the movable cutter 62 is in a state of capturing the upper thread 28 by the thread capturing process of S15 and while the lower end of the needle 15 is located above the needle plate 11 (S18). After the processing of S18, the CPU41 drives the motor 59 to move the movable cutter 62 to the cutting position P4 intersecting the fixed cutter 61, thereby cutting the upper thread 28 and the lower thread 29 (S19). In the process of S18, the sewing apparatus 1 can adjust the lengths of the upper thread 28 and the lower thread 29 from the sewing order to the last stitch by conveying the sewn article 19 by a predetermined distance. The process of S18 of the sewing device 1 contributes to the improvement of the degree of freedom of the lengths of the upper thread 28 and the lower thread 29 by using the predetermined distance.

The CPU41 controls the motor 59 so that the moving speed of the movable cutter 62 from the movable position P6 to the cutting position P4 until the upper thread 28 and the lower thread 29 are cut is lower than the moving speed of the movable cutter 62 in the thread catching process at S15. The sewing device 1 easily secures the time for executing the process of S18 by moving the movable cutter 62 from the movable position P6 to the cutting position P4 until the upper thread 28 and the lower thread 29 are cut at a lower moving speed than the moving speed of the movable cutter 62 in the thread catching process of S15.

The cutting position P4 is located between the movable position P6 and the tool standby position P1. The sewing device 1 can be made compact as compared with a case where the cutting position P4 is not located between the turning position and the cutter standby position P1.

After the thread catching process in S15, the CPU41 controls the motor 59 to stop the movable cutter 62 at the stop position P5 between the movable position P6 and the cutting position P4 for a predetermined period of time until the upper thread 28 and the lower thread 29 are cut in the process in S19 (S16). In comparison with the case where the sewing machine 1 is not stopped at the stop position P5, the time required for conveying the sewn article 19 for a predetermined distance is easily ensured in the process of S18.

The stop position P5 is a position immediately before the cutting of the upper thread 28 and the lower thread 29, and is a position immediately before the cutting, in which a distance E in the horizontal direction from the tip of the blade portion 612 of the fixed cutter 61 to the tip of the blade portion 622 of the movable cutter 62 is within 5 mm. The sewing device 1 can properly cut the upper thread 28 and the lower thread 29 in the cutting process, compared with the case where the distance E in the horizontal direction from the tip of the blade portion 612 of the fixed blade 61 to the tip of the blade portion 622 of the movable blade 62 is greater than 5 mm.

The sewing device 1 includes an input unit 16, and the cpu41 sets a predetermined distance input from the input unit 16 (S22). The CPU41 conveys the sewn article 19 at the predetermined distance set in the process of S22 in the process of S18. The sewing device 1 can improve the degree of freedom in setting the lengths of the upper thread 28 and the lower thread 29, as compared with a case where an input of a predetermined distance is not received.

The rotation center of the movable cutter 62 is provided on the opposite side of the needle hole 12 from the motor 59 side in the direction from the motor 59 toward the needle hole 12 on the surface parallel to the needle plate 11. The sewing device 1 can improve the degree of freedom of design on the motor 59 side with respect to the needle hole 12, compared with a case where the rotation center of the movable cutter 62 is provided on the motor 59 side with respect to the needle hole 12 in a direction from the motor 59 toward the needle hole 12 on a surface parallel to the needle plate 11.

The sewing apparatus 1 includes a needle thread holding mechanism 80 that is driven by the power of the motor 59 and releasably holds a needle thread end U passing through the needle thread 28 of the needle 15 below the needle plate 11. The sewing device 1 can operate the cutting mechanism 60 and the thread holding mechanism 80 by using one motor 59. The sewing device 1 can suppress the occurrence of a defect caused by the winding of the upper thread end portion or the lower thread end portion D into the thread by holding the lower thread end portion D by the cutting mechanism 60 and holding the upper thread end portion U by the upper thread holding mechanism 80.

The needle thread holding mechanism 80 includes: a first holding member 81 provided on the lower surface of the needle plate 11; a second holding member 82 rotatably supported by the supporting portion 84 on the needle plate 11 and holding the upper thread end U in cooperation with the first holding member 81; and a moving portion 67 that moves the second holding member 82 in the horizontal direction by the power of the motor 59. The moving unit 67 moves the second holding member 82 to a standby position Q1 and a holding position Q2, wherein the pin hole 12 is arranged between the first holding member 81 and the second holding member 82 in the horizontal direction at the standby position Q1, the second holding member 82 is separated from the pin hole 12 in the horizontal direction at the holding position Q2, and the second holding member 82 overlaps the first holding member 81 in the vertical direction. In the sewing device 1, the power of the needle thread holding mechanism 80 can be shared with the cutting mechanism 60, so that the structure can be simplified as compared with the sewing device 1 in which the power of the needle thread holding mechanism 80 and the power of the cutting mechanism 60 are provided separately.

The support portion 84 is provided on the motor 59 side with respect to the needle hole 12 in a direction from the motor 59 toward the needle hole 12 on a surface parallel to the needle plate 11. In the sewing device 1, when the rotation center of the movable cutter 62 of the cutting mechanism 60 is provided on the opposite side of the needle hole 12 from the motor 59 side in the direction from the motor 59 toward the needle hole 12 on the surface parallel to the needle plate 11, the possibility of interference between the needle thread holding mechanism 80 and the cutting mechanism 60 can be reduced, and the degree of freedom in design on the opposite side of the motor 59 side can be improved with respect to the needle hole 12.

The sewing device 1 includes a biasing member 65 fixed to the lower side of the needle plate 11. The movable cutter 62 has: a wire holding portion 66 capable of holding a base wire end D of the base wire 29 cut by the movable cutter 62 between the wire holding portion and the biasing member 65; and a wire releasing portion 68 that cannot clamp the base wire end portion D with the urging member 65. When the second holding member 82 is located at the standby position Q1, the movable cutter 62 is located at the cutter standby position P1, and when the second holding member 82 is located at the holding position Q2, the movable cutter 62 and the urging member 65 sandwich the bobbin thread end portion D. The sewing device 1 can synchronize the operations of the upper thread holding mechanism 80 and the cutting mechanism 60. The sewing device 1 can clamp the bobbin thread end portion D by the cutting mechanism 60 when the upper thread holding mechanism 80 is located at the standby position Q1 and when it is located at the holding position Q2.

The sewing device of the present invention can be variously modified in addition to the above-described embodiments. The structure of the sewing device 1 may be changed as appropriate, and for example, the sewing device 1 may not include at least one of the needle thread holding mechanism 80, the fixed blade 97, the input unit 16, and the display unit 13. The structure of the needle thread holding mechanism 80 can be appropriately changed. The structure, shape, size, arrangement, etc. of the first holding member 81 and the second holding member 82 may be appropriately changed. The first holding portion 86 and the second holding portion 87 may be integrated, or the second holding member 82 may not include the second holding portion 87, and the upper thread end portion U may be vertically sandwiched by the first holding member 81 and the second holding member 82. The penetrating portions 88 and 89 may be omitted, and the planar shape of the penetrating portions 88 and 89 may be, for example, holes of arbitrary shape penetrating in the vertical direction. The through portions 88 and 89 may have the same shape or may have different shapes. The first holding member 81 may have a through-hole such as a notch or a through-hole for allowing the needle 15 to pass therethrough. The first holding portion 86 may not be provided on the same horizontal plane as the movable cutter 62. The standby position Q1 and the holding position Q2 may be appropriately changed with respect to the position of the second holding member 82. When the second holding member 82 is positioned at the standby position Q1, the second holding member 82 may be separated from the receiving hole 12 and the first holding member 81 in the horizontal direction.

The structure of the cutting mechanism 60 may be appropriately changed. The cutting mechanism 60 may not include at least one of the biasing member 65, the wire holding portion 66, and the wire releasing portion 68, and the base wire end D may not be held between the biasing member 65 after the upper wire 28 and the base wire 29 are cut in S19. The cutting mechanism 60 may be operated by a power of a motor different from the motor 59 of the needle thread holding mechanism 80, or the movable cutter 62 may be operated by a power of the motor 59 via a power transmission member different from the link mechanism 72. The correspondence between the position of the movable cutter 62 of the cutting mechanism 60 and the position of the second holding member 82 of the upper thread holding mechanism 80 can be appropriately changed. The biasing member 65 may be configured other than a leaf spring such as a coil spring. The support shaft 69 may be fixed to the motor 59 side, i.e., the rear side, with respect to the receptacle hole 12.

The program including the instruction for causing the sewing device 1 to execute the main process may be stored in the storage device 45 before the CPU41 executes the program. Therefore, the program acquisition method, the program acquisition path, and the program storage device may be changed appropriately. The program executed by the CPU41 may be received from another device via a cable or wireless communication and stored in a nonvolatile memory device. Other devices include, for example, a PC, a server connected via a network.

Part or all of the processing performed by the sewing apparatus 1 may be performed by an electronic device (for example, ASIC) different from the CPU 41. The processing performed by the sewing apparatus 1 may be distributed by a plurality of electronic devices (e.g., a plurality of CPUs). The steps of the processing performed by the sewing device 1 may be changed in order, omitted, or added as needed. The scope of the invention also includes such means: an Operating System (OS) or the like running on the sewing apparatus 1 executes a part or all of the respective processes in accordance with instructions of the CPU 41.

In the processing of S17, the sewing apparatus 1 may move the movable cutter 62 at a low speed so that the cloth feeder 5 conveys the sewn article 19 a predetermined distance and then the movable cutter 62 reaches the cutting position P4 without stopping the movable cutter 62 at the stopping position P5. When the movable cutter 62 is stopped at the stop position P5 in the process of S17, the sewing apparatus 1 may control the motor 59 so that the moving speed of the movable cutter 62 in the thread catching process of S15 is equal to or higher than the moving speed of the movable cutter 62 from the movable position P6 to the cutting position P4 until the upper thread 28 and the lower thread 29 are cut. The stop position P5 may be changed as appropriate, or a position at which the upper thread 28 and the lower thread 29 are cut and the distance E in the horizontal direction from the tip of the blade 612 of the fixed cutter 61 to the tip of the blade 622 of the movable cutter 62 is greater than 5mm may be used.

The tool standby position P1, the release position P2, the wire catching position P3, the cutting position P4, the stop position P5, and the movable position P6 of the movable tool 62 can be appropriately changed. The cutting position P4 may not be located between the movable position P6 and the tool standby position P1, and the movable position P6 may be located in a direction from the tool standby position P1 toward the cutting position P4 with respect to the cutting position P4. The shape of the fixed cutter 61 and the movable cutter 62 and the structure of the movable cutter 62 may be changed as appropriate in consideration of the positional relationship between the movable position P6 and the cutting position P4. The sewing device 1 may or may not automatically set the predetermined distance inputted from the input unit 16.

If the sewing apparatus 1 does not include the fixed knife 97, the CPU41 may determine whether or not the release timing is the release timing of the upper thread end U in S10, and if the release timing is the release timing, the upper thread holding mechanism 80 may hold the upper thread end U. In this case, the CPU41 may move the second holding member 82 to the standby position Q1 as a process of releasing the holding of the upper thread end U. The timing of releasing the bobbin thread end portion D by the cutting mechanism 60 and the timing of releasing or cutting the upper thread end portion U may be the same as or different from each other.

The sewing device 1 may have a structure for moving the needle bar mechanism 30 and the shuttle mechanism in the front-rear direction and the left-right direction instead of the cloth feeder 5 as the conveying mechanism, or may be configured by adding a structure for moving the needle bar mechanism 30 and the shuttle mechanism in the front-rear direction and the left-right direction as the conveying mechanism, and the conveying mechanism may be moved relative to the sewn material to perform sewing. In this case, the conveying process in S18 may be performed by moving the needle bar mechanism 30 and the shuttle mechanism at least a predetermined distance in the direction with respect to the sewn article in the period T2 from the timing T8 to the timing T9.

The above-described modifications may be appropriately combined within a range that does not contradict each other. The technology disclosed in the present specification can be realized by various means, for example, by means of a control method of a sewing apparatus, a computer program for realizing the above method, a recording medium recording the computer program, and the like.

Claims

1. A sewing device is characterized in that,

The sewing device comprises:

A needle bar mechanism having a needle bar, a lower end of the needle bar being capable of mounting a needle, the needle bar mechanism swinging the needle bar in an up-down direction;

A needle plate, in which a needle accommodating hole is formed for the needle to penetrate;

A conveying mechanism for conveying the sewing material to at least one direction relative to the needle bar mechanism;

A cutting mechanism capable of cutting the upper thread and the lower thread; and

A control device for controlling the needle bar mechanism, the conveying mechanism and the cutting mechanism,

The cutting mechanism comprises:

a fixed cutter fixed to the lower side of the needle plate;

a movable cutter which is provided so as to be rotatable in a horizontal direction with respect to the fixed cutter; and

A cutter moving part having a motor for rotating the movable cutter in the horizontal direction by power of the motor,

The control device performs the following processing:

A sewing process in which the needle bar mechanism and the conveying mechanism are driven to form a stitch on the sewn article by using the upper thread and the lower thread;

A thread catching process of driving the motor to move the movable cutter from a cutter standby position, in which the movable cutter is positioned apart from the fixed cutter in the horizontal direction, to a needle thread catching position, in which the movable cutter catches the needle thread positioned near the needle accommodating hole, and further to a movable position, in which the movable cutter is positioned on the opposite side of the needle thread catching position from the cutter standby position, in accordance with a stitch having a final sewing order on the sewn object;

A length adjustment process of conveying the sewn article by the conveying mechanism for a predetermined distance under a condition that the movable cutter is caught by the thread catching process and the lower end of the needle is located above the needle plate; and

And a cutting process of cutting the upper thread and the lower thread after the length adjustment process, wherein the motor is driven to move the movable cutter to a cutting position intersecting the fixed cutter.

2. The sewing apparatus of claim 1, wherein the sewing machine is configured to perform the sewing operation,

The control device controls the motor so that a moving speed of the movable cutter from the movable position to the cutting position until the upper thread and the lower thread are cut is lower than a moving speed of the movable cutter in the thread catching process.

3. The sewing apparatus of claim 1, wherein the sewing machine is configured to perform the sewing operation,

The cutting position is located between the movable position and the cutter standby position.

4. The sewing apparatus of claim 1, wherein the sewing machine is configured to perform the sewing operation,

The control device controls the motor to stop the movable cutter at a stop position between the movable position and the cutting position for a predetermined period of time after the thread catching process until the upper thread and the lower thread are cut in the cutting process.

5. The sewing apparatus of claim 4, wherein the sewing machine is configured to perform the sewing operation,

The stop position is a position immediately before cutting the upper thread and the lower thread, and is the position at which a distance in the horizontal direction from the edge portion tip of the fixed cutter to the edge portion tip of the movable cutter is within 5 mm.

6. The sewing apparatus of claim 1, wherein the sewing machine is configured to perform the sewing operation,

The sewing device is provided with an input part,

The control device further performs a distance setting process of setting the predetermined distance inputted from the input section,

In the length adjustment process, the sewn article is conveyed at the predetermined distance set in the distance setting process.

7. The sewing apparatus of claim 1, wherein the sewing machine is configured to perform the sewing operation,

The center of rotation of the movable cutter is provided on a side opposite to the motor side with respect to the needle hole in a direction from the motor toward the needle hole on a surface parallel to the needle plate.

8. The sewing apparatus of claim 1, wherein the sewing machine is configured to perform the sewing operation,

The sewing device further comprises a needle thread holding mechanism driven by the power of the motor and capable of holding the needle thread end of the needle thread passing through the needle at the lower side of the needle plate in a releasable manner.

9. The sewing apparatus of claim 8, wherein the sewing machine is configured to perform the sewing operation,

The upper thread holding mechanism has:

a first holding member provided on a lower surface of the needle plate;

a second holding member rotatably supported by the supporting portion to the needle plate and holding the needle thread end in cooperation with the first holding member; and

A holding moving part which moves the second holding member in the horizontal direction by the power of the motor and moves the second holding member to a standby position and a holding position,

In the standby position, rong Zhenkong is arranged between the first holding member and the second holding member in the horizontal direction,

In this holding position, the second holding member is separated from the receiving hole in the horizontal direction, and the second holding member overlaps the first holding member in the up-down direction.

10. The sewing apparatus of claim 9, wherein the sewing machine is configured to perform the sewing operation,

The support portion is provided on the motor side with respect to the needle hole in a direction from the motor toward the needle hole on a surface parallel to the needle plate.

11. The sewing apparatus of claim 9, wherein the sewing machine is configured to perform the sewing operation,

The sewing device is also provided with a force application component fixed on the lower side of the needle plate,

The movable cutter has: a wire holding portion capable of holding a base wire end portion of the base wire cut by the movable cutter between the wire holding portion and the biasing member; and a wire releasing portion which is not capable of holding the bottom wire end portion between the wire releasing portion and the biasing member,

When the second holding member is located at the standby position, the movable cutter is located at the cutter standby position,

The movable cutter and the urging member sandwich the wire end portion when the second holding member is located at the holding position.