JP2871213B2 - Bead stitch sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball stitch sewing machine in which straight holes and corner cuts are automatically formed in a work cloth.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
In a state where the edge cloth 2 whose both side edges are folded in a ring shape is addressed, they are sewn with two stitches 3 extending in parallel. There is provided a ball stitch sewing machine which automatically forms a notch formed by a four corner cut portions 6 continuous with the corner cut portion.

[0003] In this case, although not shown in detail, the straight hole 5 is formed by a center knife provided between two sewing needles when the stitch 3 is formed. After the sewing and the formation of the straight hole 5, the work cloth 4 is sent to a predetermined position, and four corner scalpels driven by the air cylinder are simultaneously protruded from below, thereby forming four corner cuts. A part 6 is formed.

[0004]

By the way, when forming a decorative pocket extending, for example, in an oblique direction in the fabric 1, as shown in FIG. 11, two stitches 3 are formed by being shifted up and down in the figure. In this case, the lengths of the corner cut portions 6 must be different from each other, and the opening angles of the corner cut portions 6 with respect to the extending direction of the straight holes 5 must be different. No. In addition, the length and angle of each corner cut portion 6 are changed according to the length of the two stitches 3 in the vertical direction (oblique deviation).

Conventionally, such a corner cut portion 6
In order to change the length dimension, a plurality of corner scalpels having different cutting lengths are prepared, and the user replaces them according to the type of sewing. Further, in order to change the opening angle of the corner cut portion 6, the user manually adjusts the mounting angle of the corner knife.

[0006] However, in such a conventional machine, every time the type of sewing is changed, there is a problem that the user has to perform a troublesome operation such as replacement of a corner knife and adjustment of an attachment angle.

[0007] The present invention has been made in view of the above circumstances, and its purpose is to provide a user-friendly operation without any troublesome work.
An object of the present invention is to provide a bead sewing machine that can form a corner cut portion with a cut length and an angle according to the type of sewing.

[0008]

A beaded sewing machine according to the present invention sewes a beaded cloth to a cloth with two stitches extending in parallel to each other. And a straight hole parallel to the seam is formed, and two corner cuts extending obliquely from the end of the straight hole and extending in a substantially V shape are formed in the straight hole. Are formed at both ends, respectively, are provided on the lower surface side of the support base for supporting the work cloth so as to be vertically movable and horizontally rotatable in correspondence with each of the corner cut portions, and are provided with respect to the ascending direction. A knife having an inclined blade portion and having the blade portion protrude from the upper surface of the support base by being raised, a knife angle adjusting mechanism for changing a horizontal directing direction of the blade portion of each of the knifes, A knife drive mechanism that moves the knife up and down, and two stitches to be formed Input means for inputting information relating to the position of the scalpel, and deciding means for determining the horizontal direction of the blade portion of each knife and the amount of elevation of each knife based on the stitch position information input by the input means. And control means for controlling the knife angle adjustment mechanism and the knife drive mechanism based on the determination by the determination means.

Further, a correction amount input means for inputting a correction amount for at least one of the angle and the cut length of each corner cut portion, and a blade for each knife based on the input of the correction amount input means. It is more effective to provide correction means for correcting the horizontal direction of the section or the amount of elevation of each knife.

[0010]

According to the above means, when the knife is raised by the knife driving mechanism, the work cloth supported by the support table is cut by the blade of the knife to form a corner cut portion. At this time, the amount of protrusion of the blade portion from the support table changes depending on the amount of rise of the scalpel. The length dimension of the corner cut portion formed at the end is changed.

At this time, since the corner cut portion is formed with an opening angle corresponding to the horizontal direction of the knife blade, the horizontal direction of the knife blade is changed by the knife angle adjusting mechanism. Accordingly, it is possible to form a corner cut portion having an arbitrary opening angle on the work cloth without performing manual adjustment.

The angle of the blade of the knife by the knife angle adjustment mechanism and the amount of rise of the knife by the knife drive mechanism are controlled by the control means, so that corner cutting with an arbitrary opening angle and length can be performed. The part can be formed on the work cloth.

In this case, the determining means determines the angle of the blade portion of the scalpel and the amount of rise of the scalpel based on the stitch position information input by the input means, and the control means determines the angle by the determining means. The knife angle adjustment mechanism and the knife drive mechanism are controlled based on the angle of the knife blade and the amount of rise of the knife.

Therefore, the corner cut section having the opening angle and the cut length corresponding to the type of sewing can be obtained without the user having to input the stitch position information corresponding to the type of sewing. Is automatically formed.

By providing the correction amount input means and the correction means, the user can correct the angle of the blade portion of the knife and the amount of rise of the knife determined by the determination means. Fine adjustment of the opening angle and the cut length of the corner cut portion can be performed.

[0016]

An embodiment of the present invention will be described below with reference to the drawings. This embodiment corresponds to claim 2.
Since the work cloth 4 shown in FIGS. 10 and 11 described in the conventional example is common to this embodiment, detailed description and new illustration are omitted, and the same reference numerals are used.

First, with reference to FIG. 5, a schematic configuration of a bead stitch sewing machine according to this embodiment will be briefly described. The main body of the sewing machine is provided with a work table 11 as a support table. On the work table 11, a sewing machine arm 13 having two needle bars 12 (only one is shown) is provided at a lower end of the work table at a predetermined interval. Have been.

The two needle bars 12 are connected to the sewing machine motor 1.
4 (shown only in FIG. 6) is driven up and down by a drive mechanism having a drive source, and is sewn on the work cloth 4 in cooperation with a thread catcher (not shown) provided on the lower surface side of the work table 11. An eye 3 is formed. Although not shown, a center knife mechanism for forming the straight hole 5 in the work cloth 4 is provided between the two needle bars 12. Further, the interval between the two needle bars 12, in other words, the interval between the two stitches 3 (hereinafter referred to as a needle width) is, for example, 8 mm to
The distance can be changed within a range of 12 mm, and is automatically changed by a control device described later.

On the work table 11, a clamp device 15 for holding the cloth 1 (work cloth 4) on the upper surface of the work table 11 is provided. This clamp device 15 holds the cloth 1 shown in FIGS. 10 and 11 at both left and right sides with an interval for forming the seam 3, and sets the cloth 1 at a set position shown by a two-dot chain line in FIG. 5. And a corner cut forming position indicated by a solid line.

The clamp device 15 is moved left and right in the figure by a cloth drive mechanism 17 provided on the lower surface side of the work table 11 and using a drive motor 16 as a drive source. Also, on the work table 11,
A binder 18 is provided on the right side of the sewing machine arm 13. The binder 18 is for holding the bead cloth 2 arranged on the upper surface of the cloth 1 held by the clamp device 15 in a state in which both side edges are folded in a ring shape.

As a result, the needle bar 12 is driven by the driving mechanism while the clamp device 15 holding the cloth 1 and the ball cloth 2 is moved from the set position in the direction of arrow A in FIG. A beaded cloth 2 is sewn to a cloth 1 by two parallel seams 3. At the same time, a straight hole portion 5 is formed by a center knife mechanism on a work cloth 4 formed by sewing the bead cloth 2 to the cloth 1. The straight hole 5 is formed such that its end is located at a position where the end thereof is retracted by a predetermined length (for example, 15 mm) from the tip of the seam 3.

On the lower surface side of the work table 11, two sets of corner knife devices 19 are provided corresponding to the corner cut forming positions of the clamp device 15. As will be described in detail later, each of the corner knife devices 19 has two sets of knife mechanisms 20 (see FIG. 2). A total of four corner cut portions 6 are formed, which are diagonally widened from the end portion 5 to the left and right and extend substantially in a V-shape.

Here, the ball stitch sewing machine according to the present embodiment is sewn with two seams 3 extending parallel to the cloth 1 as shown in FIG. Work cloth 4
In contrast, the sewing operation for forming the cut formed by the straight hole portion 5 and the four corner cut portions 6 is automatically performed. As shown in FIG. 11, two stitches 3 are formed so as to be shifted up and down in the figure, and accordingly, the length dimension of each corner cut portion 6 and the angle with respect to the straight hole portion 5 are formed. Need to be different.

Therefore, the corner knife device 19 of this embodiment is used.
As described below, the cut length dimension of the corner cut portion 6 and the angle with respect to the straight hole portion 5 can be arbitrarily changed. Hereinafter, the corner knife device 19 will be described in detail with reference to FIGS. 1 to 4 show one (right side in FIG. 5) corner knife device 19, the other corner knife device 19 has the same configuration.

The corner knife device 19 includes a base 21
And two sets of scalpel mechanisms 20. The base 21 is configured so as to extend in the horizontal direction from both upper and lower ends of a rectangular back plate 22 and integrally include a semicircular plate-shaped upper plate portion 23 and a lower plate portion 24, respectively. As shown in FIGS. 3 and 4, each of the upper plate portion 23 and the lower plate portion 24 has two long holes 23 symmetrically with respect to the center line k.
a, 23a and 24a, 24a are formed. Guide grooves 23b and 24b are formed on the lower surface of the upper plate portion 23 and the upper surface of the lower plate portion 24, respectively, which are located on the outer peripheral portion and extend in an arc shape with the center point o as a center. .

Then, two sets of knife mechanisms 20 are provided on the base 21 symmetrically with respect to the center line k. The knife mechanism 20 comprises a knife 25, a shaft 26 to which the knife 25 is mounted, Support member 2 supporting this shaft 26
Consisting of seven or two stepping motors 28, 29, etc.
Thus, the knife angle adjusting mechanism and the knife driving mechanism according to the present invention are configured.

The support member 27 is composed of two substantially fan-shaped support plates 30, 31, and a connecting portion 32 for connecting the support plates 30, 31 at an inner peripheral portion.
The support plate 30 is located on the lower surface of the upper plate portion 23 of the base 21 and a protrusion (not shown) is slidably engaged with the guide groove 23b. 24
The projection not shown is located on the upper surface of the guide groove 24b.
Are slidably engaged with. With this, the support member 27
Is provided between the upper plate portion 23 and the lower plate portion 24 of the base 21 so as to be movable in the directions of arrows B and C along the guide grooves 23b and 24b around the center point o. As shown in FIGS. 3 and 4, the support plates 30 and 31 are formed with rectangular insertion holes 30a and 31a. These insertion holes 30a and 31a are adapted to wrap around the elongated holes 23a and 24a.

A gear portion 31b is formed at the outer peripheral edge of the lower support plate 31. On the other hand, a motor 28 for adjusting the knife angle is mounted on the lower surface side of the lower plate portion 24, and a gear 28a mounted on the rotating shaft meshes with the gear portion 31b. The knife angle adjusting motor 28 is controlled by a control device to be described later, and when the knife angle adjusting motor 28 is driven, the support member 27 It is adapted to be displaced in the B and C directions.

On the other hand, the shaft 26 is in the shape of a rectangular bar that is long in the vertical direction, and a rack 26a is formed on one side of the shaft 26 as shown in FIG. The shaft 26 is connected to the insertion hole 3
By being inserted through Oa and 31a, it is supported by the support member 27 so as to be vertically movable. The upper and lower ends of the shaft 26 also protrude above and below the base 21 through the elongated holes 23a and 24a. In this case, as the support member 27 is moved in the directions of arrows B and C, the shaft 26 is also
It is configured to be moved integrally with the support member 27 within the range of 24a.

The support member 27 has a support plate 3
Motor mounting member 33 so as to extend between
The female drive motor 29 is mounted on the motor mounting member 33. This female drive motor 29
A pinion gear 29a is attached to the rotary shaft of the shaft 26, and the pinion gear 29a meshes with the rack 26a of the shaft 26. The knife drive motor 29 is also controlled by a control device described later, and the shaft 26 is moved relative to the support member 27 (base 21) by rotating the knife drive motor 29. Ascending and descending.

At the upper end of the shaft 26, a female mounting member 34 is provided.
The knife 25 is attached to the knife attachment member 34 by, for example, screwing. As shown in FIG.
The scalpel 25 has a single-edged shape with a sharp edge, and the left peak in the figure extends vertically, and the right blade 25a has an inclined shape that spreads downward. This scalpel 25 is shown in FIG.
As shown in FIG. 2, the blade tip (peak) corresponds to the center point o, and the blade portion 25a is mounted so as to extend in the radial direction from the center point o.

The corner knife device 1 constructed as described above
As shown in FIG. 5, one of the support frames 3 is attached to a support frame 35 fixed to the lower surface of the work table 11, and the other is mounted on the lower surface of the work table 11.
6 attached. At this time, the corner knife device 1
9 is mounted so that the center point o corresponds to the end of the straight hole 5 and the center line k is oriented in the left-right direction in the drawing, that is, the direction in which the straight hole 5 formed in the work cloth 4 extends. Have been.

When the supporting member 27 is rotated and displaced, the knife 25 is also rotated about the center point o, and the knife 25 is rotated by the rotating position of the knife angle adjusting motor 28. In other words, the opening angle with respect to the center line k is determined.

The knife 25 is connected to the knife driving motor 2.
9 to raise and lower, and project upward from an opening formed in the work table 11 by the ascending.
The work cloth 4 held by 5 is cut into the work cloth 4 by the blade portion 25a to form a corner cut portion 6. In this case, the rising amount of the knife 25 is changed according to the number of energizing pulses to the knife drive motor 29.

On the other hand, an operation panel 37 (shown only in FIG. 6) is provided on the front surface of the main body of the sewing machine. As shown in FIG. 6, the operation panel 37 includes a start key 38 for starting a sewing operation, and also includes a program key 39, a correction switch 40, a numeric keypad 41, a display unit 42, and the like. .

As will be described in detail later, by turning on the program key 39, the user can use the ten key 4
1, information on the positions of the two stitches 3 to be formed, in this case, the needle width L and the oblique deviation d (see FIG. 8) can be input. Further, by turning on the correction switch 40, the user can use the numeric keypad 41 to open each corner cut portion 6 with respect to the direction in which the straight hole portion 5 extends and the opening angles a, b and their cut lengths la, The correction amount of lb (see FIG. 8) can be input. Thus, the operation panel 37 functions as the input unit and the correction amount input unit according to the present invention.

Each mechanism of the bead sewing machine configured as described above is controlled by a control device 44 as control means shown in FIG. This control device 44
Is composed mainly of a microcomputer comprising a CPU 45, a ROM 46, a RAM 47 and the like, and receives signals from a start key 38, a program key 39, a correction switch 40, a ten key 41, etc. of the operation panel 37. .

The control unit 44 receives the input and executes the program stored in the ROM 46 and the RAM 47.
The sewing machine motor 14 is controlled via a driver 48 on the basis of data and the like stored in the
The drive motor 16 is controlled via a driver 50, the pulse of the knife angle adjusting motor 28 is controlled via a driver 50 (only one is shown), and the knife drive is controlled via a driver 51 (only one is shown). The motor 29 is pulse-controlled.

At this time, the control device 44 automatically forms the stitches 3 having the needle width L and the oblique deviation d in the work cloth 4 based on the input of the stitch position information. It is supposed to. At the same time, based on the stitch position information, the opening angles a and b of the corner cut portions 6, that is, the angles of the scalpels 25 with respect to the center line k, and thus the rotational position of the scalpel angle adjusting motor 28 are determined by, for example, calculation. At the same time, the cutting length of each corner cut portion 6 and the amount of rise of each knife 25 are also determined by calculation.

Therefore, the control device 44 functions as the determining means according to the present invention. In this case, since the corner cut portion 6 is formed at an angle corresponding to the horizontal directing direction of the blade portion 25a of the knife 25, the rotation position of each knife angle adjustment motor 28 is determined to determine the rotation position. The corner cut portions 6 are formed in the work cloth 4 at an opening angle corresponding to. Further, the amount of protrusion of the blade 25a from the work table 11 changes according to the amount of rise of the knife 25. Here, since the blade 25a is inclined with respect to the rising direction of the knife 25, the blade 25a The length dimension of the corner cut portion 6 formed on the work cloth 4 varies depending on the amount of protrusion. Therefore, by determining the amount of rise of the knife 25 (the number of energizing pulses to the knife drive motor 29), the cut length corresponding to the amount of rise of the knife 25 is determined.
Each corner cut portion 6 is formed on the work cloth 4.

Incidentally, the four corner cut portions 6 are formed at the same time, but at this time, the start timing of the rising of the four knives 25 is all the same. With this,
In each corner cut section 6, the timing of the start of cutting and the blade pressure are equalized.

Further, when the opening angles a and b of the corner cut portions 6 and the correction amounts of the cut lengths la and lb are input from the operation panel 37, the control device 44 responds to the input. The angle of each knife 25 with respect to the center line k (the rotational position of the knife angle adjusting motor 28) and the amount of rise of each knife 25 (the number of energizing pulses to the knife driving motor 29) are corrected. Thus, the control device 44 also has a function as a correcting means according to the present invention.

Next, the operation of the above configuration will be described with reference to FIGS. 7, 8 and 9. When the power of the bead sewing machine is turned on, the sewing operation is performed according to the flowchart of FIG. Here, when starting the sewing work, first, the operator inputs information on the positions of the two stitches 3 to be formed by using the operation panel 37.

At this time, if it is desired to perform the same sewing operation as the previous mode, it is not necessary to newly set the previous setting, so if the start key 38 is turned on (Yes in step S1) ), The sewing operation is started.
On the other hand, when input is desired, first, the program key 39 is turned on (Yes in step S2).

This input is performed by operating the ten key 41 or the like. In this embodiment, the stitch 3 is set in step S3.
, The needle width L is input in step S4, and the oblique deviation d on the sewing start side and the sewing end side is input in step S5. Here, the input of the length of the stitch 3 in step S3 is performed by setting one of the two stitches 3 as a reference and inputting the length of the stitch 3 on the reference side. In the input of the oblique deviation d,
The shift amount of the other stitch 3 from the stitch 3 on the reference side is input. In addition, as shown in FIG. 10, when performing the same sewing operation on the left and right stitches 3,
The oblique deviation d is 0.

In the next step S6, data necessary for the sewing work is set by calculation based on the input stitch position information. Here, the drive start and end timings of the two needle bars 12 and the drive timing of the center knife mechanism are set, and the appropriate opening angles a and b and the cut length la for each corner cut portion 6 are set. , Lb are obtained by calculation as follows.

As shown in FIG. 8, the tip of the straight hole 5 comes to a position retracted by 15 mm from the tip of the stitch 3 in this case, so from the needle width L and the oblique deviation d, the following equation is obtained. Thus, the appropriate opening angles a and b and the cut lengths la and lb of the corner cut portion 6 can be obtained. Then, based on these values, the angle of each knife 25 (the rotational position of the knife angle adjusting motor 28) and the amount of rise of the knife 25 (the knife driving motor 2)
9 energizing pulses) are set.

[0048]

(Equation 1) FIG. 9 shows typical examples of the opening angles a and b and the cut lengths la and lb calculated by the above equations. Accordingly, the opening angles a and b and the cut lengths la and l are calculated by calculation.
In addition to the method of obtaining b, a data table as shown in FIG. 9 is created and stored in advance, and an appropriate opening angle a, b and a cut length la, lb are obtained from the data table.
May be read to determine the angle and the amount of rise of each knife 25.

When the sewing operation is started after the above input, the operator sets the cloth 1 on the clamp device 15 at the set position, and places the bead cloth 2 on the cloth 1. And the binder 18 is operated. As a result, the ball cloth 2 is held by the clamp device 15 together with the cloth 1 in a state where both side edges of the ball cloth 2 are folded in a ring shape. Here, when the start key 38 is turned on (Yes in step S1), the sewing operation is started.

When the sewing operation is started, first, in step S7, a predetermined number of pulses are supplied to each of the knife angle adjusting motors 28 so as to be positioned at the set rotational position. Thus, the knife 25 of each knife mechanism 20 is opened at angles a and b with respect to the center line k when viewed from above.

In the next step S8, the forming operation of the seam 3 and the forming operation of the straight hole 5 are executed. This behavior is
While moving the clamp device 15 at a predetermined speed in the direction of arrow A, the left and right needle bars 12 are driven according to the sewing length and the oblique deviation d between the sewing start side and the sewing end side, respectively, and the center knife mechanism is driven. It is done by doing. Thus, the seam 3 and the straight hole 5 are formed on the work cloth 4.

When this operation is completed, in step S9, the clamp device 15 is stopped at the corner cut forming position while holding the work cloth 4, and subsequently, in step S10, the corner cut on the work cloth 4 is performed. Part 6
Is formed. This operation, as described above,
This is performed by simultaneously driving the four scalpels 25 by the scalpel drive motor 29. At this time,
The number of energizing pulses to each knife drive motor 29 corresponds to the cutting lengths la and lb set in step S6 described above.

Thus, each knife 25 is raised by a predetermined amount, and the work cloth 4 is cut by lengths la and lb corresponding to the protruding height of the blade portion 25a, and the corner cut portion 6 is cut.
Is formed. At this time, the blade 2 of each knife 25
Since the horizontal directing direction 5a is open at angles a and b with respect to the center line k, the corner cut portion 6 is formed at those open angles a and b.

After each knife 25 is lowered to the original position, in step S11, the holding of the work cloth 4 by the clamp device 15 is released, and the clamp device 15 is returned to the set position again and moved.

In such a sewing operation, the corner cut portions 6 having the opening angles a and b and the cut lengths la and lb automatically determined by the control device 44 are formed. There are circumstances such as the sharpness of the scalpel 25 is slightly different depending on the type of the dough 1, and the corner cut portion 6 may not be formed at an appropriate angle or cut length. Further, the angle and the cut length of the formed corner cut portion 6 may be slightly different from those desired by the user.

Therefore, in the ball stitch sewing machine of this embodiment, the angle and the cut length of the corner cut portion 6 are corrected (fine adjustment).
It is configured with a function that can do it. This correction is made in the routine of steps S12 to S14.

That is, when the user wants to correct the angle and the cut length of the corner cut portion 6 formed based on the data automatically determined by the control device 44, the correction switch 40 on the operation panel 37 is used. Is turned on (Yes in step S12). As a result, the operation panel 37 enters the correction input mode, and in step S13, the user operates the numeric keypad 41 or the like to input the correction amount of the angle and the cut length of each corner cut portion 6. You can do it.

When the input of the correction value is completed,
In the next step S14, according to the input correction value,
The data of the opening angles a and b and the cut lengths la and lb set in step S6 are corrected. Thereafter, when the start key 38 is turned on to start the sewing operation, the corner cut portions 6 are formed in the work cloth 4 at the opening angle and the cut length based on the corrected data. It becomes like that.

As described above, according to the present embodiment, the control device 4
By controlling the knife angle adjustment motor 28 and the knife drive motor 29 according to 4, the angle of the blade portion 25a of the knife 25 and the amount of rise of the knife 25 can be arbitrarily set, and therefore, any open angle and length dimension Can be formed on the work cloth 4. And the control device 44
Based on the stitch position information input by the user, the angle of the blade portion 25a of the knife 25 and the amount of rise of the knife 25 are determined, and the sewing operation is performed.

Accordingly, there is no need to replace the scalpel or manually adjust the angle of the scalpel as in the prior art, and the user only has to perform a simple operation of inputting information on the stitch 3, and the sewing operation is not required. It is possible to automatically form the corner cut portion 6 having an appropriate opening angle and cut length according to the type.

In addition, in this embodiment, in particular, a function for correcting the angle and the cut length of the corner cut portion 6 is added. This makes it possible to finely adjust the angle of the portion 25a and the amount of rise of the knife 25, and obtain the advantage that the opening angle and the cut length of each corner cut portion 6 can be finely adjusted. You can do it.

In the above embodiment, the corner cut portion 6
A function of correcting the angle and the cut length of the corner cut portion, but at least the controller 44 automatically determines the angle and the cut length of the corner cut portion 6 and performs a sewing operation. If so (the invention of claim 1), the intended purpose can be achieved.
In addition, the present invention is not limited to the above embodiment, and various changes can be made without departing from the scope of the invention.

[0063]

As is apparent from the above description, according to the ball stitch sewing machine of the present invention, the vertical movement and the horizontal movement corresponding to each corner cut portion are performed on the lower surface side of the support base for supporting the work cloth. A knife provided rotatably and having a blade portion inclined with respect to the ascending direction and having the blade portion projecting from the upper surface of the support base by being raised, and a horizontal orientation of the blade portion of each of the scalpels; A knife angle adjusting mechanism for changing the direction, a knife driving mechanism for moving each knife up and down,
Input means for inputting information relating to the position of the stitch of the book, and based on the stitch position information input by the input means, the direction of the horizontal direction of the blade portion of each knife and the amount of rise of each knife are determined. Since the determination means for determining and the control means for controlling the knife angle adjustment mechanism and the knife drive mechanism based on the determination of the determination means are provided, the user can perform the operation according to the type of sewing without performing troublesome work. This provides an excellent effect that a corner cut portion can be formed with the cut length and angle.

Further, a correction amount input means for inputting a correction amount for at least one of the angle and the cut length of each corner cut portion, and a blade for each knife based on the input of the correction amount input means. If the correction means for correcting the horizontal direction of the section or the amount of rise of each knife is provided, fine adjustments can be made to cope with differences in the degree of cutting of the knife depending on the type of cloth. is there.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a side view of a corner knife device.

FIG. 2 is a front view of a corner knife device.

FIG. 3 is a top view of the corner knife device.

FIG. 4 is a cross-sectional top view of the corner knife device along the line IV-IV in FIG. 2;

FIG. 5 is a schematic side view of a ball stitch sewing machine.

FIG. 6 is a block diagram showing an electrical configuration.

FIG. 7 is a flowchart showing a procedure of a sewing operation.

FIG. 8 is a diagram for explaining a calculation method of an opening angle and a cut length.

FIG. 9 is a diagram showing an example of an opening angle and a cut length.

FIG. 10 is a plan view of the work cloth showing a state where the sewing operation has been completed;

11 is a plan view of a work cloth showing a state where sewing different from that shown in FIG. 10 has been performed;

[Explanation of symbols]

In the drawing, 1 is a cloth, 2 is a ball cloth, 3 is a seam, 4 is a work cloth, 5 is a straight hole, 6 is a corner cut, 11 is a work table (support table), 12 is a needle bar, 15 Is a clamp device, 18 is a binder, 19 is a corner knife device, 20 is a knife mechanism, 21 is a base, 25 is a knife, 26 is a shaft, 27
Denotes a support member, 28 denotes a knife angle adjustment motor, 29 denotes a knife drive motor, 37 denotes an operation panel (input means, correction amount input means), and 44 denotes a control device (control means, determination means, correction means).

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazushi Inoue 15-1 Naeshiro-cho, Mizuho-ku, Nagoya-shi Inside Brother Industries, Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) D05B 1 / 00-83/00

Claims (2)

(57) [Claims] 1. A cloth cloth is sewn to a cloth by two seams extending in parallel, and a straight hole portion between the two seams and parallel to the seam is formed on the work cloth. And a corner stitch sewing machine in which two corner cut portions extending diagonally from the end of the straight hole portion and extending in a substantially V-shape are formed at both ends of the straight hole portion, respectively. In the above, the blade is provided on the lower surface side of the support base that supports the work cloth so as to be vertically movable and horizontally rotatable in correspondence with each of the corner cut portions, and has a blade portion that is inclined with respect to a rising direction and is raised A knife whose blade portion projects onto the upper surface of the support base, a knife angle adjustment mechanism that changes the horizontal direction of the blade portion of each knife, and a knife drive mechanism that moves each knife up and down, Enter information about the position of the two stitches to be formed Determining means for determining the horizontal direction of the blade portion of each knife and the amount of elevation of each knife based on stitch position information input by the input means; and determining the determining means. And a control means for controlling the knife angle adjusting mechanism and the knife driving mechanism based on the sewing machine. 2. A correction amount input means for inputting a correction amount for at least one of an angle and a cutting length of each corner cut portion, and a blade of each knife based on the input of the correction amount input means. 2. The sewing machine according to claim 1, further comprising correction means for correcting a horizontal directing direction of the portion or a rising amount of each knife.