JP2017000300A - Clamp mechanism and sewing machine having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp mechanism capable of sewing various curved surfaces.SOLUTION: A clamp mechanism includes a plurality of clamp units 40 having a pair of clamp members 41 and 42 for clamping materials to be sewn C1 and C2 and a support block 44 for supporting the pair of clamp members, and a frame 31 to which the support block is fitted. The frame has one or a plurality of fitting slots 32 to 35 disposed along a curved line or a plurality of straight lines along the curved line. A plurality of clamp units are position-adjustably fitted along the fitting slots of the frame.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a clamp mechanism for sewing a curved workpiece, and a sewing machine including the clamp mechanism.

For example, in shoe sewing, the upper part of a shoe consisting of two left and right members is stitched into a toe part and a heel part, and a sewing part such as a label or a reinforcing material is sewn outside the heel part. .
The upper heel part of the shoe needs to be curved to match the shape of the foot heel, but in order to sew with the upper curved, the fabric on both sides of the sewing position can be curved. As described above, a so-called post bed sewing machine in which the shuttle and the needle plate are erected upward from the upper surface of the sewing machine bed portion has been used.

By the way, there is also a demand for sewing by an automatic feed along a pattern corresponding to the outer shape of the sewn part even for a curved workpiece such as the upper heel portion of the shoe.
However, a sewing machine that performs sewing by automatic feeding according to a predetermined pattern is generally one in which a sewing object is placed on a plane, and the sewing object is sewn by moving the sewing object for each needle according to a plane coordinate. It could not cope with the sewing of a curved surface like the upper of a shoe.

  In order to cope with this problem, a conventional sewing machine includes a cylindrical support body that holds a curved-shaped sewing product and a stepping motor that arbitrarily rotates the support body, and automatically feeds along the circumferential surface. Sewing has been realized (for example, see Patent Document 1).

JP-A 61-265169

However, since the conventional sewing machine is configured to rotate the cylindrical support, there is a problem that the mechanism becomes large and the whole sewing machine becomes large.
In addition, since the size of the cylindrical support is fixed, it is necessary to prepare a plurality of large and small supports in order to sew a plurality of sizes of workpieces.
In particular, in the case of shoes, since the sizes are very finely divided and there are differences in the left and right shoes, a large number of supports having different sizes had to be prepared.

  An object of the present invention is to provide a clamp mechanism capable of sewing on various curved surfaces and a sewing machine including the same.

The invention according to claim 1 is the clamping mechanism,
A plurality of clamp units having a pair of clamp members for clamping the workpiece and a support block for supporting the pair of clamp members;
A frame for attaching the support block;
The frame has one or a plurality of elongated mounting holes formed along a curved curve or a plurality of straight lines along the curved curve;
The plurality of clamp units are attached so that their positions can be adjusted along the attachment holes of the frame.

The invention according to claim 2 is the clamping mechanism according to claim 1,
The clamp surface of the clamp member is composed of one or a plurality of planes.

The invention according to claim 3 is the clamping mechanism according to claim 1,
The clamp surface of the clamp member is formed of a single curved surface.

The invention according to claim 4 is the clamping mechanism according to any one of claims 1 to 3,
The pair of clamp members extend to the opposite side of the frame with respect to the support block,
The support block supports the pair of clamp members so that their positions can be adjusted along their extending directions.

The invention according to claim 5 is the clamping mechanism according to any one of claims 1 to 4,
An escape guide is provided for escaping the drooping portion that hangs down from the sewing product clamped by the clamp member from the needle drop position.

The invention according to claim 6 is a sewing machine,
A swing mechanism that swings the clamp mechanism according to any one of claims 1 to 5 about an axis located inside a curved curve of the mounting hole of the frame;
An axis moving mechanism for relatively moving the clamp mechanism and the needle bar along the axis of oscillation of the clamp mechanism;
And a control device that controls a drive source of the swing mechanism and a drive source of the axis moving mechanism to perform needle drop at an arbitrary position of the sewing product.

The invention according to claim 7 is the sewing machine according to claim 6,
An intermediate presser that moves up and down in conjunction with the needle bar is provided.

The invention according to claim 8 is the sewing machine according to claim 7,
It has a throat plate where needle drop is performed,
In the needle drop position of the throat plate, there is provided a protrusion for pressing the workpiece from above and below in cooperation with the lowering intermediate presser.

In the present invention, the position of the plurality of clamp units that hold the workpiece to be sewn can be adjusted along one or a plurality of elongated mounting holes formed along a curved curve. It can hold | maintain along the curved surface along a curved curve, and generation | occurrence | production of the wrinkle of the post-sewing and thread | yarn pulling with respect to the to-be-sewn material which has a curved surface can be suppressed, and favorable sewing can be implement | achieved.
In addition, the position of each clamp unit can be adjusted along the mounting hole. By changing the unit interval, it is possible to hold various types of ring-shaped sewing products satisfactorily. There is no need to prepare.
In addition, since the position of each clamp unit can be adjusted along the mounting hole, it is possible to perform good sewing even if the workpiece has various curved surfaces with different curvature radii by adjusting the position.
Further, since a cylindrical support is not required, the sewing machine can be downsized.

It is a perspective view of the sewing machine concerning this embodiment. It is a perspective view after the moving operation | movement of the stage of the sewing machine which concerns on this embodiment. It is a block diagram which shows the control system of the sewing machine of FIG. It is a perspective view of the 1st clamp mechanism mounted in the sewing machine. It is a front view of a 1st clamp mechanism. It is a rear view of a 1st clamp mechanism. It is a side view of the press support mechanism of a 1st clamp mechanism. It is a perspective view of the 2nd clamp mechanism mounted in the sewing machine. It is a rear view of a 2nd clamp mechanism. It is a front view of the 1st clamp mechanism which provided the escape guide. It is explanatory drawing which shows the problem which intermediate pressing has. It is explanatory drawing which shows the projection part which solves the problem which intermediate pressing has.

[Whole structure of sewing machine]
Hereinafter, a sewing machine 100 according to an embodiment of the present invention will be described with reference to FIGS. The sewing machine 100 is an automatic sewing machine that performs needle dropping at an arbitrary position according to a predetermined sewing pattern using first and second clamp mechanisms 30 and 50 suitable for holding a workpiece having a curved surface.
FIGS. 1 and 2 are perspective views showing a part of the sewing machine 100 with a part of the structure omitted, and FIG. 3 is a block diagram showing a control system of the sewing machine.
In the following description, a case where the reinforcing material C2 and the label C3 as the sewing product are sewn to the heel portion of the upper shoe C1 (see FIG. 5) of the annular shoe as the sewing product will be exemplified.

  The sewing machine 100 includes a needle bar that holds a sewing needle at the lower end, a needle bar vertical movement mechanism that moves the needle bar up and down, a hook mechanism that captures the upper thread passed through the sewing needle and entangles the lower thread, An intermediate press mechanism for moving the intermediate presser 11 up and down, a first clamp mechanism 30 that holds the upper C1 and the reinforcing material C2, a second clamp mechanism 50 that holds the upper C1 and the label C3, and first and first The swing mechanism 70 that swings the second clamp mechanisms 30 and 50, the axis movement mechanism 80 that moves the first and second clamp mechanisms 30 and 50 along the swing axis, and the above-described configurations are stored or stored. A sewing machine frame 20 to be mounted, and a control device 90 that controls each of the above components and performs needle drop at any position of the upper C1, the reinforcing material C2, and the label C3 are provided.

The sewing machine frame 20 includes a sewing machine bed portion 21 located at a lower portion, a standing body portion 22 raised from the sewing machine bed portion 21, and a sewing machine extending from the upper end portion of the standing body portion 22 in parallel with the sewing machine bed portion 21. Arm portion 23.
In FIGS. 1 and 2, the illustration of the cover of each part of the sewing machine frame 20 is omitted, and the illustration of the internal configuration thereof is also omitted.

  The needle bar vertical movement mechanism includes a sewing machine motor 12, an upper shaft that is rotated by the sewing machine motor 12, and a crank mechanism that converts the rotational force of the upper shaft into a vertical driving force and applies it to the needle bar. The detailed description is omitted.

The hook mechanism is a well-known configuration including a so-called horizontal hook, a hook shaft that supports the horizontal hook, a lower shaft that is rotated by the sewing machine motor 12, and a transmission mechanism that transmits rotational force from the lower shaft to the hook shaft. The detailed explanation is omitted.
Further, the sewing machine 100 is a so-called post bed sewing machine, and a horizontal shuttle is built in an upper part of a post bed 24 erected at a position below the sewing needle in the sewing machine bed portion 21.

The intermediate presser mechanism is a known configuration including an intermediate presser bar that holds the intermediate presser 11 at the lower end portion, and a crank mechanism that converts the rotational force of the upper shaft into a driving force for vertical movement and applies it to the intermediate presser bar. Detailed description is omitted.
The intermediate presser 11 includes a cylindrical portion into which the sewing needle is loosely inserted, and the cylindrical portion has a role of pressing the sewing product from above when the sewing needle is raised to suppress fluttering of the sewing product.
The intermediate presser mechanism transmits an operation so that the intermediate presser 11 moves up and down at the same cycle as the sewing needle and is delayed from the sewing needle. As a result, the object to be sewn that is pulled up by the raising of the sewing needle is pressed down, and the sewing needle is pulled out from the article to be sewn well.

[First clamp mechanism]
4 is a perspective view of the first clamping mechanism 30, FIG. 5 is a front view, and FIG. 6 is a rear view.
The first clamp mechanism 30 is arranged in order along the Y-axis direction, and supports the four clamp units 40A to 40D that overlap and clamp the upper C1 and the reinforcing material C2, and the clamp units 40A to 40D. And a frame 31.

  Since the four clamp units 40A to 40D are substantially the same in configuration and structure, in the following description, the clamp units 40A to 40D are collectively referred to as the clamp unit 40, and the configuration of each part included in each clamp unit 40A to 40D. The same reference numerals are used to describe common contents, and different points between the individual clamp units 40A to 40D will be described individually.

  The frame 31 of the first clamp mechanism 30 is a long flat plate, parallel to the flat plate surface of the frame 31 and parallel to the longitudinal direction of the frame 31, and parallel to the flat plate surface of the frame 31. However, each part of the first clamping mechanism 30 will be described with the direction perpendicular to the longitudinal direction as the Z-axis direction and the direction perpendicular to the flat plate surface of the frame 31 as the X-axis direction.

  The clamp unit 40 includes a pair of clamp members including an upper clamp member 41 disposed above the upper C1 and the reinforcing material C2, and a lower clamp member 42 disposed below the upper C1 and the reinforcing material C2. A pressing support mechanism 43 that presses the upper clamp member 41 toward the lower clamp member 42 and a support block 44 that supports the upper clamp member 41 and the lower clamp member 42 are provided.

The lower clamp member 42 is a long plate-like member along the X-axis direction, and extends from the support block 44 toward the side opposite to the frame 31.
The lower clamp members 42 of the two clamp units 40B and 40C located in the center in the Y-axis direction among the four clamp units 40A to 40D are two planes 421 and 422 (both upper surfaces are parallel to the X-axis direction). The lower clamp members 42 of the two clamp units 40A and 40D located at both ends in the Y-axis direction are formed from a flat surface 421 (clamp surface) whose upper surface is parallel to the X-axis direction. It is configured.
And each plane 421,422 of the upper surface of the lower clamp member 42 of these clamp units 40A-40D is along the circular arc which protrudes upwards seeing from a X-axis direction, as shown in FIG. They are arranged side by side.

Each lower clamp member 42 is attached to the support block 44 with screws 441 in a state where the upper surface of the end portion on the support block 44 side is in contact with the lower surface of the support block 44.
Each of the support blocks 44 includes a stepped portion that abuts the side end of the lower clamp member 42 on the one end side in the Y-axis direction. In addition, a long hole 442 extending vertically is formed in the support block 44 along the X-axis direction, and a screw 441 is inserted into the long hole 442 from above and inserted into a screw hole of the lower clamp member 42. Yes.
Accordingly, the screw 441 is loosened, the lower clamp member 42 is slidably brought into contact with the lower surface and the stepped portion of the support block 44 and moved along the X-axis direction, and the screw 441 is fastened at an arbitrary position, whereby the lower side The extension length of the clamp member 42 with respect to the support block 44 can be adjusted.

  Furthermore, the shape of each lower clamp member 42 viewed from the Z-axis direction of the extended end portion approximates the shape of the side edge portion of the reinforcing material C2. For this reason, in the case of sewing, the vicinity of the needle drop position along the side edge part of the reinforcing material C2 can be held.

The upper clamp member 41 is a plate-like member, and is supported by the support block 44 via the pressing support mechanism 43 with its lower surface facing the upper surface of the lower clamp member 42.
Among the four clamp units 40A to 40D, the upper clamp members 41 of the two clamp units 40B and 40C located at the center in the Y-axis direction are two flat surfaces 411 and 412 (the clamps are both parallel to the X-axis direction). The upper clamp members 41 of the two clamp units 40A and 40D located at both ends in the Y-axis direction are configured by a single plane 411 (clamp surface) whose lower surface is parallel to the X-axis direction. ing.
And each plane 411,412 of the lower surface of the upper side clamp member 41 of these clamp units 40A-40D is located in a line along an arc that is convex upward as seen from the X-axis direction, as shown in FIG. Are arranged as follows.
Further, the respective flat surfaces 411 and 412 on the lower surface of the upper clamp member 41 of the clamp units 40A to 40D are individually parallel to the respective flat surfaces 421 and 422 on the upper surface of the opposed lower clamp member 42. The upper C1 and the reinforcing material C2 sandwiched between the lower clamp member 42 and the lower clamp member 42 can be held in a state substantially along the circumferential surface including the aforementioned arc.

FIG. 7 is a side view of the clamp unit 40.
The pressing support mechanism 43 includes a movable block 431 attached to the upper surface of the upper clamp member 41 with screws, a base portion 432 fixedly mounted on the upper surface of the support block 44, and the lower clamp member by rotating the upper clamp member 41. 42, an operation lever 433 that switches between a holding position that faces 42 and a release position that is separated from the lower clamp member 42, a rotating arm 434 that supports the upper clamp member 41 via the movable block 431, a base 432, and an operation lever 433. And a link member 435 connecting the two.

The base portion 432 is connected to a lower portion of one end portion of the rotating arm 434 at one end portion in the X axis direction so as to be rotatable around the Y axis, and is connected to one end portion of the link member 435 at the other end portion in the X axis direction. It is connected so as to be rotatable around an axis.
One end of the operation lever 433 is connected to the upper part of one end of the rotating arm 434 so as to be rotatable about the Y axis, and the other end is an input operation for switching between the holding position and the release position. Has become a department. Further, the other end of the link member 435 is connected to be rotatable around the Y axis at a position near one end of the operation lever 433 and slightly closer to the other end.

Thereby, the base 432, the operation lever 433, the rotating arm 434, and the link member 435 constitute a four-bar link mechanism.
In this configuration, when the input operation portion of the operation lever 433 is rotated downward, the operation lever is more than the straight line connecting the connection point between the operation lever 433 and the rotation arm 434 and the connection point between the link member 435 and the base portion 432. The connection point between 433 and the link member 435 is on the lower side. In this state, even if the upper C1 and the reinforcing material C2 are clamped between the upper clamp member 41 and the lower clamp member 42 and the operation lever 433 is pushed back by the restoring force, the input operation portion of the operation lever 433 is moved upward. The force is not transmitted in the pushing-up direction, and the clamped state can be maintained.

In addition, an elongated hole 434b extending in the X-axis direction is formed in the rotating arm 434 so as to penetrate vertically, and is connected to the movable block 431 by a screw 434a passed through the elongated hole 434b. Accordingly, the movable block 431 can be moved to an arbitrary position in the X-axis direction with the screw 434a loosened, and the screw 434a can be fastened to be fixed at that position.
That is, the position of the upper clamp member 41 can be arbitrarily adjusted in the X-axis direction. As described above, since the position of the lower clamp member 42 can also be adjusted in the X-axis direction, by adjusting the position of the upper clamp member 41 and the lower clamp member 42, the width that can be clamped between them is adjusted. can do.

As described above, the support block 44 supports the upper clamp member 41 on the upper surface side and supports the lower clamp member 42 on the lower surface side.
Further, the support block 44 has an end surface portion that abuts the flat plate surface of the frame 31 at the end opposite to the extending end portions of the upper clamp member 41 and the lower clamp member 42, and the end surface portion Are supported by the frame 31 in a state of being in close contact with each other.

As shown in FIG. 6, the frame 31 is a flat plate that is long in the Y-axis direction and is formed in an approximately arch shape.
Then, in order to attach the four clamp units 40A to 40D to the frame 31, upper attachment holes 32 and 33, which are polygonal long holes composed of a plurality of straight lines along a curved arc, and lower attachments. The holes 34 and 35 are formed so as to penetrate vertically.

The upper mounting holes 32 and 33 are formed in the frame 31 at one end and the other end in the Y-axis direction, and both have two straight portions 321, 322 and 331, 332.
The straight portions 321, 322, 331, and 332 are all formed along a common arc A 1 whose center position is set below the frame 31.
The lower mounting holes 34 and 35 are formed at one end and the other end in the Y-axis direction in the frame 31, and both have two straight portions 341, 342 and 351, 352. .
The straight portions 341, 342, 351, and 352 are all formed along a common arc A 2 whose center position is set below the frame 31. The arc A2 is concentric with the arc A1 described above and is set to have a smaller diameter than the arc A1.
Although the upper mounting holes 32 and 33 are divided into two, they may be connected to form one upper mounting hole. In that case, the upper mounting holes 32 and 33 may be formed from more straight portions. . The same applies to the lower mounting holes 34 and 35.

And the support block 44 of each clamp unit 40A-40D has two screw holes formed in the end surface part by the side of the flame | frame 31 up and down, the upper side attachment hole 32 or the upper side attachment hole 33, and the lower side attachment hole 34 or The screw is fixed to the frame 31 by fastening screws 36 and 37 (see FIG. 7) individually inserted into the lower mounting hole 35.
Further, by loosening these screws 36 and 37, the position of each clamp unit 40 can be adjusted along the upper mounting hole 32 and the lower mounting hole 34, or along the upper mounting hole 33 and the lower mounting hole 35. is there. That is, the position of each clamp unit 40 can be adjusted along the arcs A1 and A2. Furthermore, position adjustment can be performed while maintaining a constant posture with respect to the centers of the two arcs A1 and A2.

  The support block 44 may be attached to only one of the upper attachment hole and the lower attachment hole with a single axis so that the angle can be adjusted around the single axis. In this case, each clamp unit 40 does not maintain a fixed posture with respect to the centers of the two arcs A1 and A2, but it is possible to bend the workpiece into various shapes regardless of the arc. Become.

[Second clamping mechanism]
8 is a perspective view of the second clamp mechanism 50, and FIG. 9 is a rear view.
In addition, about the structure or structure which is common with the 1st clamp mechanism 30 mentioned above about this 2nd clamp mechanism 50, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted, and the 1st clamp mechanism 30 mainly Different points will be described.
The second clamp mechanism 50 is arranged in order along the Y-axis direction, and includes three clamp units 60A to 60C that clamp the upper C1 and the label C3, and a frame 51 that supports the clamp units 60A to 60C. It has.
The three clamp units 60A to 60C are also collectively referred to as the clamp unit 60, and the same reference numerals are used for the configuration of each part of each of the clamp units 60A to 60C to describe common contents, Differences between the clamp units 60A to 60C will be described individually.
Also in the case of the second clamp mechanism 50, the direction parallel to the flat surface of the frame 51 and parallel to the longitudinal direction thereof is defined as the Y-axis direction, and the direction parallel to the flat plate surface of the frame 51 and perpendicular to the longitudinal direction thereof. The Z axis direction and the direction perpendicular to the flat plate surface of the frame 51 will be described as the X axis direction.

  The clamp unit 60 includes a pair of clamp members including an upper clamp member 61 disposed above the upper C1 and the label C3, a lower clamp member 62 disposed below the upper C1 and the label C3, and an upper clamp. A pressing support mechanism 43 that presses the member 61 toward the lower clamp member 62 and a support block 64 that supports the upper clamp member 61 and the lower clamp member 62 are provided.

The lower clamp member 62 is a plate-like member and extends from the support block 64 toward the side opposite to the frame 51.
Of the three clamp units 60A to 60C, only the clamp unit 60B located at the center in the Y-axis direction is constituted by a pair of lower clamp members 621 and 622 in which the lower clamp member 62 is arranged along the Y-axis direction. Has been.

The lower clamp members 62, 621, and 622 of all the clamp units 60A to 60C are configured by a single plane (clamp surface) whose upper surface is parallel to the X-axis direction.
And each plane of the upper surface of lower clamp members 62, 621, and 622 of these clamp units 60A-60C is arranged so that it may line up along the circular arc which becomes convex upwards seeing from the X-axis direction. Yes.

The two clamp units 60A and 60C are the same as the first clamp mechanism 30 in that the lower clamp member 62 is supported by the support block 64 so that the position of the lower clamp member 62 can be adjusted in the X-axis direction.
On the other hand, with respect to the central clamp unit 60B, a pair of lower clamp members 621 and 622 are supported by the support block 64 so as to be individually adjustable in position along the Y-axis direction.

  Further, the shape of the extended end portion of the lower clamp member 62 of all the clamp units 60A to 60C approximates the shape of the side edge portion of the label C3.

The upper clamp member 61 is a plate-like member, and is supported by the support block 64 via the pressing support mechanism 43 with its lower surface facing the upper surface of the lower clamp member 62.
Note that only the clamp unit 60B located at the center is constituted by a pair of upper clamp members 611 and 612 in which the upper clamp member 61 is arranged along the Y-axis direction.

The upper clamp members 61, 611, and 612 of all the clamp units 60 are configured by a single plane (clamp surface) whose lower surface is parallel to the X-axis direction.
And each plane of the lower surface of upper clamp members 61, 611, and 612 of these clamp units 60A-60C is arranged so that it may line up along the circular arc which becomes convex upwards, seeing from the X-axis direction. .
Also, the lower surfaces (clamp surfaces) of the upper clamp members 61, 611, and 612 are individually parallel to the upper surfaces of the lower clamp members 62, 621, and 622 that face each other, similar to the first clamp mechanism 30. is there.

Moreover, since each clamp unit 60 is provided with the press support mechanism 43 same as the 1st clamp mechanism 30, the description is abbreviate | omitted.
However, in the two clamp units 60A and 60C, the upper clamp member 61 is supported by the pressing support mechanism 43 so that the position of the upper clamp member 61 can be adjusted in the X-axis direction. However, for the central clamp unit 60B, a pair of upper clamp members 611 is provided. , 612 are supported by the pressing support mechanism 43 so as to be individually adjustable in position along the Y-axis direction.

As shown in FIG. 9, the frame 51 is a flat plate that is long in the Y-axis direction and is formed in an approximately arch shape.
In order to attach the three clamp units 60A to 60C to the frame 51, upper mounting holes 52, 53 and lower mounting holes 54, which are long holes made of a plurality of straight lines along a curved arc. 55 is formed so as to penetrate vertically.

The upper mounting holes 52 and 53 are formed in the frame 51 in the vicinity of the center in the Y-axis direction, and both are formed along a common arc A3 having a center position set below the frame 51.
The lower mounting holes 54 and 55 are formed in the frame 51 in the vicinity of the center in the Y-axis direction, and both are formed along a common arc A4 having a center position set below the frame 51. ing. The arc A4 is concentric with the arc A3 described above and has a smaller diameter than the arc A3.

  Although the upper mounting holes 52 and 53 are divided into two, they may be connected to form one upper mounting hole. In this case, the upper mounting holes 52 and 53 are formed in a broken line shape composed of a plurality of straight portions. May be. The same applies to the lower mounting holes 54 and 55.

The support block 64 of the clamp unit 60A is fastened with two screws 56 (one not shown) whose end faces on the frame 51 side are individually inserted into the upper mounting hole 52 and the lower mounting hole 54, respectively. To be fixed to the frame 51.
In addition, the support block 64 of the clamp unit 60C is fastened with two screws 56 (one not shown) whose end faces on the frame 51 side are individually inserted into the upper mounting hole 53 and the lower mounting hole 55, respectively. To be fixed to the frame 51.
The positions of the two clamp units 60A and 60C can be adjusted along the upper mounting hole 52 and the lower mounting hole 54, or along the upper mounting hole 53 and the lower mounting hole 55, while maintaining a constant posture. The point which can perform position adjustment is the same as that of the 1st clamp mechanism 30. FIG.

[Axis movement mechanism]
The axis moving mechanism 80 is movable along the swing axis direction of the swing mechanism 70 and the stage 81 on which the first and second clamp mechanisms 30 and 50 are mounted, and the swing mechanism 70 described later. A pair of slide guides 82 and 82 to be supported, an axis moving motor 83 as a driving source for the movement of the stage 81 in the swing axis direction, and a ball screw for converting the torque of the axis movement motor 83 into a linear motion in the swing axis direction And a mechanism 84.

The slide guides 82 and 82 are fixedly mounted on the upper surface of the sewing machine bed portion 21 so as to be parallel to the swing axis direction. The swing axis direction coincides with the longitudinal directions of the sewing machine bed portion 21 and the sewing machine arm portion 23.
Each of the slide guides 82 and 82 can slide the stage 81 via four sliders 821 (only one is shown in FIGS. 1 and 2) provided at the lower part of the stage 81.

The stage 81 is a rectangular frame.
The ball screw mechanism 84 includes a ball nut 841 provided at a corner of the stage 81, and a ball screw shaft 842 that is inserted through the ball nut 841 and connected to the output shaft of the axis movement motor 83.
The axis moving motor 83 is not particularly limited as long as the operation amount can be controlled. For example, a stepping motor is used.
With these configurations, the axis moving mechanism 80 arbitrarily positions the upper C1, the reinforcing material C2, and the label C3 held by the first and second clamping mechanisms 30 and 50 on the stage 81 in the swing axis direction. Can do.

[Oscillation mechanism]
The swing mechanism 70 includes a swing frame 71 that is swingable about a predetermined swing axis with respect to the stage 81 of the axis moving mechanism 80, and a swing that guides the swing of the swing frame 71. A swing guide 73 mounted on the upper surface of the stage 81 and serving as a drive source for the swing operation of the swing frame 71, and a transmission mechanism 74 for transmitting the torque of the swing motor 73 to the swing frame 71. And.

The swing frame 71 fixedly supports the first clamp mechanism 30 and the second clamp mechanism 50 so that the extending directions of the pair of clamp members are parallel and opposed to each other. For example, the first clamp mechanism 30 and the second clamp mechanism 50 are connected in advance to face each other, and the clamp mechanisms 30 and 50 are fixedly supported by a toggle mechanism 711 provided on the swing frame 71.
The swing frame 71 is supported by a swing shaft (not shown) provided below the stage 81.
Then, on the axis of the swing shaft, the center of the arc along which the lower surface of the upper clamp member and the upper surface of the lower clamp member of the first and second clamp mechanisms 30 and 50 that are fixedly supported, The center of the arcs A1 and A3 of the mounting holes and the arcs A2 and A4 of the lower mounting holes are all set.
As a result, even if the swing frame 71 swings, the sewing needles and horizontal hooks with respect to the upper C1, the reinforcing material C2 and the label C3 held by the first clamp mechanism 30 and the second clamp mechanism 50 are connected. The distance can be kept constant.

  The swing guide 72 is a guide plate having a guide groove into which a boss-shaped projection (not shown) provided on the swing frame 71 is inserted. The guide groove is formed in an arc shape centering on the swing axis, and suppresses vibration when the swing frame body 71 swings to maintain a stable swing operation.

The swing motor 73 is not particularly limited as long as the operation amount can be controlled. For example, a stepping motor is used.
The transmission mechanism 74 includes a so-called belt mechanism, and specifically, a main drive sprocket 741 provided on the output shaft of the swing motor 73 and a driven sprocket (not shown) provided on the swing shaft of the swing frame 71. A timing belt 742 is provided between the main driving sprocket 741 and the driven sprocket.

  With these configurations, the swing mechanism 70 can arbitrarily control the swing angles of the upper C1, the reinforcing material C2, and the label C3 held by the first and second clamp mechanisms 30 and 50 on the stage 81. it can.

[Sewing machine control system]
As shown in FIG. 3, the control device 90 includes a display panel 94 that displays various settings relating to sewing and the current state of the sewing machine, and screen selections and commands for performing various settings provided in the display panel 94. A setting switch 95 as setting input means for inputting numerical values and an operation pedal 98 for inputting the start of sewing are connected via an input / output circuit (not shown).

  The operation pedal 98 is means for inputting a drive command for a sewing operation to the control device 90 by a stepping operation. That is, when the operation pedal 98 is depressed, the control device 90 performs operation control to start sewing.

  From the setting switch 95, various parameters for performing sewing for sewing the reinforcing material C2 and the label C3 to the upper C1, for example, setting of sewing pattern data for sewing, selection of a sewing pattern, etc. An operator performs input.

Further, the control device 90 is connected to a sewing machine motor 12, a swing motor 73, and an axis moving motor 83, which are objects of control, via drive circuits 12a, 73a, and 83a, respectively.
The control device 90 includes a CPU 91 that performs various controls, and a memory 92 in which a control program that executes operation control of the sewing machine 100 and various sewing data are written.

The memory 92 stores, for example, sewing pattern data.
The sewing pattern data includes position coordinate data in which all needle drop positions constituting the sewing pattern for sewing the reinforcing material C2 and the label C3 are developed in a coordinate system composed of a position in the swing axis direction and a swing angle. It is data.
The sewing pattern data is determined for each shoe size of the upper C1 and each of the left and right shoes, and can be appropriately selected from these sewing pattern data.

  In accordance with the control program, the CPU 91 reads the selected sewing pattern data, and positions the upper C1, the reinforcing material C2, and the label C3 at each needle drop position constituting the sewing pattern, The operation amount of the axis movement motor 83 is calculated, and the swing motor 73 and the axis movement motor 83 are driven and controlled so as to be the calculated operation amount for each stitch in synchronization with the sewing machine motor 12.

[Sewing preparation and sewing operation]
The flow from the preparation work to the sewing work when performing the sewing of the reinforcing material C2 and the label C3 on the upper C1 of the sewing machine 100 will be described.
First, one end of the upper C1 and the reinforcing material C2 are set in the first clamp mechanism 30, and the other end of the upper C1 and the label C3 are set in the second clamp mechanism 50.
That is, the operation lever 433 is raised for all the clamp units 40A to 40D of the first clamp mechanism 30 to release the upper clamp member 41. Then, the upper C1 and the reinforcing member C2 are overlapped in a state where the sewing is aligned, placed on the lower clamp member 42, the operation lever 433 is tilted, and the upper clamp member 41 and the lower clamp member 42 Clamp.
The upper C1 and the label C3 are similarly clamped for each of the clamp units 60A to 60C of the second clamp mechanism 50.
Then, the first clamp mechanism 30 and the second clamp mechanism 50 are attached to the swing frame body 71 of the swing mechanism 70 by the toggle mechanism 711.

When the preparatory work is completed and the sewing pattern data is selected from the setting switch 95 of the sewing machine 100, the CPU 91 calculates the operation amount for each stitch of the swing motor 73 and the axis moving motor 83.
Further, when the start of sewing is input by the operation pedal 98, the CPU 91 starts to drive the sewing machine motor 12, and in synchronization with the vertical movement of the needle bar, the swing motor 73 and the axis movement motor 83 for each needle. The upper C1, the reinforcing material C2, and the label C3 are swung and moved axially, and needle dropping is sequentially performed at the needle dropping positions determined in the sewing pattern data.

When needle drop is performed at all needle drop positions determined in the sewing pattern data, the sewing machine motor 12 is stopped and the sewing operation is completed.
Further, the first clamp mechanism 30 and the second clamp mechanism 50 are removed from the swinging frame body 71, and the upper clamp members 41 are brought into a released state for all the clamp units 40A to 40D of the first clamp mechanism 30. Similarly, all the clamp units 60A to 60C of the second clamp mechanism 50 are set in a released state.
Accordingly, the upper C1 to which the reinforcing material C2 and the label C3 are sewn can be removed, and a series of sewing operations is completed.

[Effect of the embodiment]
As described above, the first clamping mechanism 30 of the sewing machine 100 has the long hole-shaped attachment holes 32 to 35 formed along a plurality of straight lines arranged so that the frame 31 follows the circular arc, The clamp units 40 </ b> A to 40 </ b> D are attached along the attachment holes 32 to 35 of the frame 31 so that the position can be adjusted.
The second clamp mechanism 50 also has long hole-shaped attachment holes 52 to 55 formed along a straight line in which the frame 51 is arranged so as to follow an arc, and the three clamp units 60 </ b> A to 60 </ b> C are attached to the frame 51. It is attached along the mounting holes 52 to 55 so that the position can be adjusted.
As a result, each clamp unit can be arranged so that it can accommodate curved surfaces of various sizes, and the workpiece can be held along the curved surface, making it possible to eliminate the need for a support for each size individually. It becomes. In particular, regarding the sewing of shoes, the size of the article to be sewn is finely classified, but the first and second clamping mechanisms 30 and 50 can be adapted to various sizes by adjusting the position of the clamping unit. Sewing products can be held, which is particularly effective.

  Moreover, since the 1st and 2nd clamp mechanisms 30 and 50 formed the lower surface of the upper clamp members 41 and 61 of each clamp unit 40 and 60, and the upper surface of the lower clamp members 42 and 62 from one or two planes. Each clamp member can be processed easily. In particular, when formed with two or more planes, the sewing product can be held in a state closer to a curved surface, and good sewing can be performed on the curved sewing product.

The upper clamp members 41 and 61 and the lower clamp members 42 and 62 in the first and second clamp mechanisms 30 and 50 can be adjusted in position along the extending direction.
Therefore, the extension amount of each clamp member 41, 42, 61, 62 can be adjusted arbitrarily, and the clamp width by upper clamp member 41, 61 and lower clamp member 42, 62 can be adjusted. Therefore, it is possible to perform good clamping on various types of sewing products having different dimensions.

Further, the sewing machine 100 includes an arc A1 along the upper mounting holes 32 and 33 of the frame 31 of the first clamping mechanism 30, an arc A2 along the lower mounting holes 34 and 35, and a frame 51 of the second clamping mechanism 50. The first and second clamping mechanisms 30 and 50 are swung around the axis located at the center of all of the arc A3 along the upper mounting holes 52 and 53 and the arc A4 along the lower mounting holes 54 and 55. A swing mechanism 70 that moves the first and second clamp mechanisms 30 and 50 along an axis along which the first and second clamp mechanisms 30 and 50 swing, and an axis moving mechanism 80 that controls these. And a control device 90 for performing needle drop at an arbitrary position of the sewing product.
Therefore, the combination of swing and linear movement enables needle drop to be performed more accurately on the curved surface of the workpiece, and it is possible to improve the sewing quality.
Further, in the sewing machine 100, if the needle drop positions are stored in order based on the sewing pattern data or the like, automatic sewing can be performed on the sewing pattern on the curved surface.

  Further, since the sewing machine 100 is provided with the intermediate presser 11 that moves up and down in conjunction with the needle bar, the sewing needle after dropping the needle can be more reliably pulled out from the sewing work that moves and swings the swing axis. Thus, it is possible to prevent the workpiece and the sewing needle from being damaged, and to perform an excellent movement operation of the workpiece.

[Escape guide]
Further, when the upper C1 as the sewing product has a toe C11 as a hanging portion that is in a hanging state when the upper C1 is set in the first clamp mechanism 30, a post bed 24 as a needle drop position is located directly below the upper C1. There is a possibility that the toe C11 may cause interference.
Therefore, as shown in FIG. 10, a pair of escape guides 38 and 39 for bringing the toe C11 to one side in the swing axis direction (in this example, the frame 31 side) is provided on the frame 31 of the first clamping mechanism 30. Also good.
The escape guides 38 and 39 are disposed on the side of the frame 31 in the swing axis direction so that the entire guide avoids interference with the post bed 24 when the first clamp mechanism 30 swings. In the state most moved to the opposite side, the post bed 24 is arranged so as to be further on the frame 31 side than the end surface on the frame 31 side in the swing axis direction.

Thereby, at the time of sewing, generation | occurrence | production of interference with the toe C11 and the post bed 24 can be reduced, and it becomes possible to perform favorable sewing.
The escape guides 38 and 39 have a structure in which the toe C11 is brought closer to the frame side, but may be a structure in which the toe C11 is brought closer to the opposite side in the swing axis direction.
Further, although the escape guides 38 and 39 are rod-shaped, they may be plate-shaped. Moreover, although the case where two escape guides 38 and 39 were provided was illustrated, only one or three or more may be provided.
The escape guides 38 and 39 are not limited to the first clamp mechanism 30 and may be provided in the second clamp mechanism 50.

[protrusion]
As shown in FIG. 11, the hook 14 is built inside the upper portion of the post bed 24, and a needle drop hole (not shown) in which the needle drop by the sewing needle 13 is performed is formed in the upper end portion of the post bed 24. A needle plate 15 is provided.
And since the reinforcing material C2 and the label C3 which are to-be-sewn products are hold | maintained at the 1st or 2nd clamp mechanism 30 and 50 along a curved surface, the reinforcing material C2 or the label C3, and the throat plate 15 There is a gap between them.
In this case, when the intermediate presser 11 is lowered, sewing is performed in a state where the reinforcing material C2 or the label C3 is bent downward so as to crush the gap, so that there is a possibility that good sewing cannot be performed.
Further, in order to eliminate the gap, if the reinforcing material C2 or the label C3 is made as close as possible to the needle plate 15, the needle plate 15 and the reinforcing material C2 or the second clamping mechanism 30, 50 are swung. There is a risk that the label C3 comes into sliding contact with the clamp mechanism 30 or 50, and the label C3 is displaced, or the reinforcing material C2 or the label C3 is damaged.

Therefore, when the intermediate presser 11 is used, a protruding portion 16 protruding upward is provided around the needle drop position of the needle plate 15, and the reinforcing material C2 and the label are provided from above and below by the downwardly pressing intermediate presser 11 and the protruding portion 16. It is more desirable to perform sewing while holding C3.
In this way, by providing the protrusion 16, the downward bending by the intermediate presser 11 of the reinforcing material C2 and the label C3 can be suppressed, and sewing can be performed while maintaining a state close to the curved surface, which is better. Sewing can be realized.
Further, the protrusion 16 can reduce the occurrence of sliding contact between the reinforcing material C2, the label C3, and the needle plate 15.

[Others]
The upper and lower mounting holes 32, 33, 52 and 53 and the lower mounting holes 34, 35, 54 and 55 formed in the frames 31 and 51 in the first and second clamping mechanisms 30 and 50 have one or two straight lines. However, it may be more linear, or may be a circular arc or a curved line other than the circular arc.
In particular, when the shape of the sewing object is a curved surface other than a curved surface having a circular arc cross section, it is desirable that each mounting hole has a curved shape corresponding to the cross sectional shape of the curved surface.

Further, the position of the swing axis line by the swing mechanism 70 is most preferably the center of an arc along which each mounting hole extends, but it may be closer to the arc than the center.
In addition, when the mounting hole is not arcuate but has a concave shape, the swing axis may be disposed inside the concave shape.

  Further, the lower surface of the upper clamp member and the upper surface of the lower clamp member are not limited to one or two or more planes, and may be formed by one curved surface. By making these into curved surfaces, the sewing object can be held in a state along the curved surface, and better sewing can be performed.

  In the first clamp mechanism 30 and the second clamp mechanism 50, the number of clamp units may be at least two, and may be increased or decreased.

  Each clamp member is not limited to a plate shape. For example, the upper and lower clamp members may be composed of a pair of rods. In that case, it is desirable to increase the number of clamp units and increase the number of clamp points by the rod.

  Moreover, although the case where sewing was performed using both the first clamp mechanism 30 and the second clamp mechanism 50 was illustrated in the above embodiment, one of the first clamp mechanism 30 or the second clamp mechanism 50 is illustrated. It is also possible to carry out sewing by attaching only the sewing machine 100 to the sewing machine 100.

  The axis moving mechanism 80 moves the clamp mechanisms 30 and 50 in the axial direction. However, the present invention is not limited to this, and the mechanism for moving the needle bar in the axial direction or the lower end of the needle bar along the axial direction. A needle swing mechanism that swings may be mounted on the sewing machine 100.

11 Intermediate presser 15 Needle plate 16 Protruding portion 30 First clamp mechanism 31 Frame 32, 33 Upper mounting holes 34, 35 Lower mounting holes 38, 39 Relief guides 40, 40A to 40D Clamp unit 41 Upper clamp member 42 Lower clamp Member 43 Press support mechanism 44 Support block 50 Second clamp mechanism 51 Frame 52, 53 Upper mounting holes 54, 55 Lower mounting holes 60, 60A to 60C Clamp units 61, 611, 612 Upper clamp members 62, 621, 622 Side clamp member 64 Support block 70 Oscillation mechanism 73 Oscillation motor (drive source)
80 Axis Movement Mechanism 83 Axis Movement Motor (Drive Source)
90 Control device 100 Sewing machine 321,322,331,332 Straight part 341,342,351,352 Straight part 411,412,421,422 Planar 611,612 Upper clamp member 621,622 Lower clamp member A1-A4 Arc C1 Upper (Sewing product)
C2 Reinforcement material (to be sewn)
C3 label (to be sewn)
C11 toe (hanging part)

Claims (8)

A plurality of clamp units having a pair of clamp members for clamping the workpiece and a support block for supporting the pair of clamp members;
A frame for attaching the support block;
The frame has a curved curve or one or a plurality of slotted attachment holes formed along a plurality of straight lines along the curved curve;
The clamp mechanism, wherein the plurality of clamp units are attached so as to be position-adjustable along attachment holes of the frame.   The clamp mechanism according to claim 1, wherein the clamp surface of the clamp member includes one or a plurality of planes.   The clamp mechanism according to claim 1, wherein the clamp surface of the clamp member is a single curved surface. The pair of clamp members extend to the opposite side of the frame with respect to the support block,
The clamp mechanism according to any one of claims 1 to 3, wherein the support block supports the pair of clamp members so that the position of the pair of clamp members can be adjusted along an extending direction thereof.   The clamp mechanism according to any one of claims 1 to 4, further comprising an escape guide for escaping a hanging part hanging from the sewing product clamped by the clamp member from a needle drop position. A swing mechanism that swings the clamp mechanism according to any one of claims 1 to 5 about an axis located inside a curved curve of the mounting hole of the frame;
An axis moving mechanism for relatively moving the clamp mechanism and the needle bar along the axis of oscillation of the clamp mechanism;
A sewing machine comprising: a control device that controls a drive source of the swing mechanism and a drive source of the axis movement mechanism to perform needle drop at an arbitrary position of the sewing product.   The sewing machine according to claim 6, further comprising an intermediate presser that moves up and down in conjunction with the needle bar. It has a throat plate where needle drop is performed,
The sewing machine according to claim 7, wherein a protrusion is provided at a needle drop position of the needle plate to press the workpiece from above and below in cooperation with the intermediate presser that is lowered.

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