JPH0344555B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a shoulder patch stitching process in which a core material whose outline is in the shape of a shoulder patch is wrapped in a cloth folded in half, and the periphery excluding the folded part is sewn. Regarding the clamping device used.

Conventional technology Cover stitching for shoulder patches has traditionally been done by hand, but it is not easy to sew along the periphery of the wrapped core material while maintaining the curved shape, and it takes quite a while. This required a lot of skill, and the finish tended to be uneven. In order to deal with this problem, a system has been proposed in which shoulder pads are automatically covered with stitches. This is shown in JP-A-62-19195, in which a cloth containing a core material is held down with a clamp on a suction base, and the sewing machine is moved forward and backward while rotating while the cloth is held in a fixed state, so that the fabric is attached to the periphery of the clamp. I try to suture it along the line. In addition, a method has been proposed in which a jig for clamping the shoulder patch is used, and the jig is moved along the presser foot to perform sutures along the periphery of the jig (Utility Model No. 62-
No. 73883).

Problems to be Solved by the Invention According to the device or jig proposed above, the shoulder pads can be easily covered-stitched automatically or by using a jig, but the shoulder pads have various sizes. However, when using the above devices or jigs to suture items of different sizes, the clamps or jigs must be changed each time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a clamp device for shoulder pads that is equipped with a clamp size variable mechanism that can accommodate various sizes.

Means for Solving the Problems The clamp device for shoulder patch stitching of the present invention has a horseshoe-shaped outer periphery and is made up of a plurality of divided pieces, and the size can be changed by changing the interval between each divided piece. The present invention is characterized by comprising a pair of variable clamp mechanisms each having a presser foot or a presser foot receiver and disposed opposite to each other so as to be openable and closable, and a drive mechanism that interlocks the divided pieces and moves them toward and away from each other.

In addition, the clamp size variable mechanism has a left-handed and right-handed threaded nut that is fitted onto a single shaft with left-handed and right-handed threads, and the divided pieces are supported by the left-handed and right-handed nuts, respectively, by simply rotating the shaft. , it is possible to reduce or enlarge the presser foot and presser foot holder to almost similar shapes.

Only one shaft for driving this variable clamp size mechanism is required for each pair of variable clamp size mechanisms.

Note that the movement of the nuts can be used as is for approaching and separating in the width direction, but if the moving member that supports the divided piece is connected to both nuts with a link, the divided piece moves in the direction perpendicular to the axis.

Furthermore, when the presser foot or presser foot holder is divided into four parts, each support rod that supports the left and right inner divided pieces is connected to the left and right nuts using links, and both support rods are connected to each other at the proximal end. The divided pieces approach and separate in diagonal curves.

Embodiment FIG. 3 shows an example in which a clamping device, generally designated by reference numeral 1, is incorporated into an automatic shoulder stitching device, in which an overlock sewing machine 2 is mounted on a servo motor 4 attached to an XY table 3. The needle is moved in the X-axis direction and the Y-axis direction by servo motors 5 and 6 for the X-axis and Y-axis, and rotated around the needle drop point by the servo motor 4. .

The clamp device 1 is supported by a rotary actuator 10 as shown in FIG. 3, and can be switched between a sewing position facing the sewing machine 2 and a shoulder patch attachment/detachment position rotated 90 degrees from this position. As shown, it consists of a lower clamp mechanism 7 and an upper clamp size variable mechanism 8 that can be opened and closed up and down, and when the upper clamp size variable mechanism 8 is opened (solid line position), the shoulder parts 9 are attached or removed. Further, when closed (the position indicated by the two-dot chain line), the periphery of the interlining 11 of the shoulder patch 9 is clamped by the presser foot receivers 38 and the presser foot 25 of both the clamp size variable mechanisms 7 and 8. Reference numeral 12 denotes a control box containing control devices for the overlock sewing machine 2 and various motors incorporated in the present device.

To covert stitch the shoulder patch, clamp the shoulder patch 9 and switch the clamp device 1 to the sewing position shown in Figure 3, then turn the overlock sewing machine 2 in the X-axis direction and the Y-axis direction.
By moving in the axial direction and around the needle drop point, the needle drop moves along the presser foot 25 of the clamp size variable mechanisms 7 and 8, and the direction of movement is the same as the presser foot 25.
This is done by controlling the angle so that it coincides with the tangential direction of .

Next, the clamp size variable mechanism will be explained.

FIG. 1 shows details of the upper clamp size variable mechanism 8. A shaft 15 that is rotationally driven by a pulse motor 13 via a belt transmission 14 has a left-hand thread 16 and a right-hand thread 17. 16 and 1
A nut 18 is screwed onto each of the nuts 7, and the two prongs are fitted into the upper side of a bracket formed integrally with the nut and connected by a pin (not shown), so that each movement moves integrally with the nut. Rotation of the shaft 15 causes the members 19 to move symmetrically toward or away from each other while remaining parallel. 21 is connected to the shaft 1 by the guide 22.
Support members movably guided in a direction perpendicular to 5, each moving member 19 is guided by a link 23.
The movable member 19 moves forward and backward in a direction perpendicular to the shaft 15 by expanding or contracting the movable member 19. The presser foot 25 that presses the periphery of the interlining of the shoulder patch 9 has the shape of the outer periphery of the shoulder patch and is divided into left and right side pieces 25a and a center piece 25b, and each side piece 25a is attached to the movable member 19 by an arm 26. The center piece 25b is supported by the support member 21 by an arm 27.

This upper clamp size variable mechanism is constructed as described above, and when the shaft 15 rotates in the direction of the arrow in the figure from the solid line position in FIG. Similarly, expand 25a to the position indicated by the two-dot chain line. At the same time, the support member 21 moves forward to the two-dot chain line position in conjunction with the movement of the moving member 19, and the center piece 25b is also moved forward to the two-dot chain line position. As described above, the presser foot 25 is expanded by rotating the shaft 15 in the direction of the arrow. When the shaft 15 rotates in the opposite direction, it contracts to the solid line position.

FIG. 4 shows the details of the lower clamp size variable mechanism 7, in which, like the upper clamp size variable mechanism 8, each movable member 31 whose two forks are fitted to the lower side of the nut 18 and connected is rotated by the rotation of the shaft 15. The movable members 3 move symmetrically by moving closer to or away from each other while maintaining a parallel state.
1 and the support rod 32 are connected in the same direction by a link 33 at each rear end and by a link 34 slightly shorter than the link 33 at the middle part, so that the movable members 31 move away from each other or approach each other. Along with this movement, the tip moves forward while expanding slightly in the direction perpendicular to the movement, or moves backward while narrowing. Both support rods 32 are also connected at their rear ends by a link 35, which is provided with a U-shaped guide 36, in which the movement of the link 35 in the direction perpendicular to the axis 15 is controlled by a pin 37 that fits into the guide 36. are now being guided. 38a, 38b, 38
C and 38d are divided presser receiving pieces that are attached to the front ends of each moving member 31 and the support rod 32, respectively, and constitute the presser foot receiver 38, and are arranged opposite to the presser foot 25 of the upper clamp size variable mechanism 8, These four divided presser foot receiving pieces are adjusted to a predetermined size by approaching and separating from each other, and the side pieces 25 of the presser foot are adjusted to a predetermined size.
a. Clamp the shoulder pad in cooperation with the central piece 25b.

As described above, the clamp device of this embodiment is incorporated into an automatic cover stitch device for shoulder pads that performs cover stitch by moving the overlock sewing machine in the X- and Y-axis directions and around the needle drop point. ,
It can be incorporated into other types of automatic case-stitching devices, such as the type mentioned above in which the clamp device rotates and the sewing machine advances and retreats in synchronization with it, or it can be used alone as a jig. You can also do that. In this case, the adjustment according to the size of the shoulder pad can be performed manually instead of using the pulse motor 13.

Effects of the Invention As described above, the clamp device of the present invention is incorporated into an automatic shoulder patch sewing device or used as a jig for shoulder patch sewing, and can be adjusted according to the size of the shoulder patch. is possible. Furthermore, according to the invention of the second claim, 1
The size of the presser foot of the clamp can be easily adjusted by simply rotating the shaft of the book, and according to the invention of claim 5,
The size of a pair of presser feet can be adjusted at the same time.

Further, according to the third aspect of the invention, even when the size is increased and the intervals between the divided pieces are widened, the gripping portion does not become unstable.

According to the fourth aspect of the invention, the structure is the most basic and simple, and it can sufficiently accommodate a relatively small size change range.

According to the invention of claim 6, the central presser receiving piece is simultaneously reduced and expanded in the width direction and the length direction,
This has the effect of allowing you to change the size of almost similar shapes.

[Brief explanation of drawings]

Fig. 1 is a plan view of a clamping device that is an embodiment of the present invention, Fig. 2 is a side view of the main parts of the clamping device, and Fig. 3 is an automatic shoulder patch sewing machine incorporating the clamping device. The perspective view and FIG. 4 are plan views of a lower clamp mechanism in a clamp device that is an embodiment of the present invention. 1... Clamp device, 2... Overlock sewing machine, 3... XY table, 4, 5, 6... Servo motor, 7... Lower clamp size variable mechanism, 8
...Upper clamp size variable mechanism, 9...Shoulder parts, 10...Rotary actuator, 11
...interlining, 13...pulse motor, 15...shaft,
18... Nut, 19... Moving member, 21... Supporting member, 25... Presser.

Claims (1)

[Scope of Claims] 1. Each has a presser foot or a presser foot holder whose outer periphery is approximately horseshoe-shaped and is made up of a plurality of divided pieces and whose size can be changed by changing the interval between the divided pieces, A clamp device for case-stitching shoulder patches, comprising a pair of variable clamp size mechanisms disposed facing each other so as to be openable and closable, and a drive mechanism for interlocking the divided pieces to approach and separate them. 2. The drive mechanism consists of one shaft 15 with a left-hand thread and a right-hand thread carved in the center, and a pair of left and right nuts that fit into the left and right screws, and each divided piece is connected to each nut. A clamp device for shoulder patch stitching according to claim 1. 3. The shoulder pad according to claim 1, wherein when the presser foot of one variable clamp size mechanism is opposed to the presser foot receiver of the other variable clamp size mechanism, the dividing positions of the presser foot and the presser foot holder are made to differ from each other. A clamp device for covering stitches. 4. The drive mechanism includes a shaft 15 having a left-hand thread 16 and a right-hand thread 17, and a pair of nuts 18, 18 that fit into each thread of the shaft 15 and move toward or away from each other as the shaft 15 rotates; Support member 2 connected to both nuts 18, 18 via link 23
1, and the presser foot or presser foot holder is divided into left and right side pieces 25a, 25a and a center piece 25b, and the side pieces 25a, 25a are connected to the nuts 18, 1.
8, the center piece 25b is connected to the support member 21, respectively, so that the presser foot or the presser foot receiver can be expanded or contracted to a substantially similar shape by rotation of the shaft 15.
A clamp device for shoulder patch stitching as claimed in the claims. 5 Nut 1 in which each opposing clamp size variable mechanism is fitted to one common shaft 15
3. A clamping device for shoulder patch stitching according to claim 2, wherein the clamping device is driven by 8 and 18. 6 Consisting of multiple divided pieces, the divided pieces can be reduced to approximately similar shapes by moving the divided pieces closer to each other and further away from each other.
An upper clamp member 8 having a presser foot whose outer periphery is approximately horseshoe-shaped so that it can be expanded; left and right presser receiving pieces 38a and 38d which are disposed opposite to this upper clamp member and whose outer peripheries are approximately the same shape as the presser foot; and left and right centers. It is provided with a lower clamp member 7 having a presser foot divided into four parts including receiving pieces 38b and 38c, and is fitted to each screw of a shaft 15 having a left-hand thread 16 and a right-hand thread 17 carved with the center part as a boundary. Natsu 18,1
a pair of left and right moving members 31, 31 which are integrally fixed to 8 and support the left and right presser receiving pieces 38a, 38d, respectively; A pair of left and right support rods 32, 32 are arranged inside the shaft 15, and are connected to each other at one end by a link 35, and have the center receiving pieces 38b, 38c attached to the other end, respectively, and rotate the shaft 15. The presser receiving pieces 38a, 38b of the lower clamp member 7 together with the nuts 18, 18,
38c and 38d approach and separate from each other, so that the presser foot holder as a whole shrinks and expands into a substantially similar shape.