JP4031884B2 - Automatic sewing machine fabric transfer device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cloth moving device for an automatic sewing machine, and more particularly to a cloth moving device for an automatic sewing machine that performs sewing according to pre-programmed data.
[0002]
[Prior art]
In order to move a sewing product in a sewing machine, various fabric moving devices have been used conventionally, and an example thereof is shown in FIG. In the figure, the cloth movement device includes a vertical movement means 122 and a sewing product holding part 428 that can be moved up and down by the vertical movement means 122, and the sewing product holding part 428 has fingers 138 and 140 that can be opened and closed. As shown in FIG. 12A, the sewn product clamping portion 428 is disposed above the sewn product 112 on the sewn product support portion 104 of the sewing machine. When the sewing product 112 is moved, the vertical movement means 122 lowers the fingers 138 and 140 to the position where the sewing product support portion 104 contacts the sewing product 112 as shown in FIG. As shown in (C), the fingers 138 and 140 are closed and the sewn product 112 is clamped. The sewing product holding portion 428 holding the sewing product 112 is lifted by the vertical movement means 122 and moved to a predetermined place by a horizontal movement means (not shown), and then the fingers 138 and 140 are opened to drop the sewing product 112.
[0003]
[Problems to be solved by the invention]
In such a fabric moving device that holds the sewn product 112 by lowering the sewn product clamping unit 428 to the position of the sewn product 112, the sewn product support unit 104 is inclined due to an error in manufacturing, for example. In some cases, the sewn product 112 cannot be clamped.
[0004]
That is, as shown in FIG. 13A, when the straight line L connecting the tips of the fingers 138 and 140 is not parallel to the upper surface of the sewing product holding portion 428, the sewing product holding portion is shown in FIG. When 428 is lowered, only one finger 140 comes into contact with the sewing product 112, but the other finger 138 does not come into contact. Therefore, even if the fingers 138 and 140 are closed as shown in FIG. Can not.
[0005]
Such a phenomenon occurs when the sewn product support portion 104 is inclined, the sewn product holding portion 428 is inclined due to an attachment error of the sewn product holding portion 428, or the sewn product support portion 104 is uneven. This can also occur when there is a step or when there is a step in the sewing product 112 itself.
[0006]
Accordingly, an object of the present invention is to provide a fabric moving device that can securely clamp the sewn product 112 even when the straight line L connecting the tips of the fingers 138 and 140 and the upper surface of the sewn product 112 are not parallel. .
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, there are two abutting portions that are capable of abutting and opening and closing with the sewn product on the sewn product supporting portion of the sewing machine, and closing the two abutting members A sewn product nipping part for nipping the sewn product, a vertical movement means for moving the sewn product nipping part up and down, and a swinging device for swinging the sewn product nipping part in substantially the same direction as the opening and closing direction of the contact part; An automatic sewing machine fabric transfer device is provided.
[0008]
For example, the swing device includes a bracket vertically moved by the vertically moving means, a swing fulcrum shaft fixed to the sewing product holding portion and rotatably connected to the bracket, the bracket, and the sewing product. Elastic means for biasing the sewn product sandwiching portion to the swinging origin position.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a sewing machine incorporating a first embodiment of a cloth moving device for an automatic sewing machine according to the present invention.
[0010]
In the figure, a sewing product support portion 4 is provided on the sewing machine frame 2, and a sewing machine head 6 and an XYZ axis driving device 8 are disposed on the sewing product support portion 4. The presser foot device 10 is configured to be movable in the XY direction by the XYZ axis driving device 8 while holding the sewn product 12 on the sewn product support portion 4, and is also movable in the Z direction before and after sewing. ing. This sewing machine is an automatic sewing machine that performs sewing by pre-programmed data.
[0011]
Reference numeral 14 denotes a cloth moving device, which includes a frame 16, a rotating arm 18, air cylinders 20 and 22, bearings 24 and 24, a vertical shaft 26, a sewing product holding portion 28, an arm 34, and the like.
[0012]
The frame 16 is fixed to the side wall of the sewing machine frame 2. A vertical shaft 26 extending in the vertical direction is rotatably connected to the frame 16 via bearings 24 and 24, and a rotating arm 18 is fixedly or rotatably connected to the vertical shaft 26. Accordingly, the rotary arm 18 is attached to the frame 16 so as to be rotatable in the horizontal direction (AB direction in the figure).
[0013]
The air cylinder 20 is connected on the head side to the sewing product support portion 4 at the connection portion 30, and connected on the rod side to the rotary arm 18 at the connection portion 32. The air cylinder 20 can swing around the connection portion 30 with respect to the sewing product support portion 4 and can rotate around the connection portion 32 with respect to the rotary arm 18. Are connected to each. When the air cylinder 20 is actuated and the rod is extended, the rotating arm 18 is rotated in the B direction around the vertical shaft 26, and when the rod is retracted, the rotating arm 18 is rotated in the A direction.
[0014]
An air cylinder (vertical movement means) 22 is fixed to the tip of the rotary arm 18 via an arm 34. A sewing product clamping portion 28 is connected to the lower side of the air cylinder 22.
[0015]
FIG. 2 is a front view of the sewn product clamping unit 28 of the fabric moving device 14 of FIG. 1, and FIG. 3 is a side view showing a part of the sewn product clamping unit 28 in cross section.
[0016]
In these drawings, a U-shaped bracket 36 is fixed to the air cylinder 22. A chuck 42 including two fingers (contact portions) 38 and 40 that can be opened and closed in the EF direction in the drawing is disposed inside the bracket 36. Although a drive mechanism that opens and closes the fingers 38 and 40 is not shown, for example, air supplied via an air supply tube can be used. Instead of the air type, a mechanical type or an electric type can also be used.
[0017]
A swing fulcrum plate 44 is fixed to the chuck 42, and a swing fulcrum shaft 46 and a first spring hook 48 are fixed to the swing fulcrum plate 44. A second spring hook 50 is fixed to the bracket 36. In this embodiment, a second spring hook 50, a first spring hook 48, and a swing fulcrum shaft 46 are arranged in order from above.
[0018]
Further, the bracket 36 is formed with a through hole 46a having a diameter slightly larger than that of the swing fulcrum shaft 46, and a through hole 48a having a diameter larger than that of the first spring hook 48. The moving fulcrum shaft 46 and the first spring hook 48 are inserted. The through hole 48a is not limited to a circular shape as shown in the figure, and may be, for example, an elongated hole that is elongated in the horizontal direction.
[0019]
One end of the tension spring (elastic means) 52 is connected to the first spring hook 48 and the other end is connected to the second spring hook 50.
[0020]
Since the sewn product sandwiching portion 28 has such a configuration, the chuck 42 has the swing fulcrum shaft 46 as the center and is substantially in the same direction (CD direction in FIG. 2) as the opening and closing direction of the fingers 38 and 40 (EF direction in FIG. 2). The swing range is determined by the diameter of the through hole 48a of the bracket 36. Therefore, the size of the through hole 48a is determined so that a necessary swing range can be obtained. The second spring hook 50, the first spring hook 48 and the swing fulcrum shaft 46 are normally aligned in the vertical direction as shown in the figure. The rocking device includes a bracket 36, a rocking fulcrum shaft 46, and elastic means 52.
[0021]
A general operation of the automatic sewing machine cloth moving device having the above-described configuration will be described. When the presser foot 10 is lifted by the XYZ shaft driving device 8 after the sewing is finished, the air cylinder 22 is actuated and the rod 22a extends downward, so that the sewn product clamping portion 28 is placed on the sewn product 12. Descend. The sewing product 12 is clamped by operating the chuck 42 and closing the two fingers 38 and 40. Thereafter, the rod 22a of the air cylinder 22 moves backward, and the sewn product clamping portion 28 rises. By operating the air cylinder 20 and extending its rod, the rotary arm 18 rotates in the direction B, and after moving the sewn product clamping portion 28 to a predetermined position, the fingers 38 and 40 are opened to open the sewn product 12. Drop down. When the rod of the air cylinder 20 moves backward and the rotary arm 18 rotates in the A direction, the sewn product clamping portion 28 returns to the original position, and waits until the next sewing is completed.
[0022]
FIG. 4 is a front view for explaining the operation of the fabric movement device according to the present embodiment, and shows the sewn product clamping unit 28 when the sewn product support unit 4 is inclined. As described above, the sewn product clamping portion 28 that has been waiting above the sewn product 12 is lowered by the extension of the rod 22a of the air cylinder 22 after the end of the sewing, but the sewn product support portion 4 is inclined as shown in the figure. First, one finger 38 comes into contact with the sewn product 12 on the sewn product support 4, and as a result, the chuck 42 is centered on the swing fulcrum shaft 46 in the clockwise direction (arrow C direction). Start swinging. As a result of this swinging, one finger 38 moves to the left in FIG. 4, and the sewn product 12 sandwiched between the one finger 38 and the sewn product support 4 also moves with the movement of the one finger 38. To the left in FIG. This swinging continues further, and when the sewn product clamping portion 28 further descends and the other finger 40 comes into contact with the sewn product 12 on the sewn product supporting portion 4, the descending stops and the swinging also stops.
[0023]
As described above, according to the present invention, even when the sewing product support portion 4 is inclined, the two fingers 38 and 40 can both come into contact with the sewing product 12. Similarly, according to the present invention, in addition to the case where the sewn product support portion 4 is inclined, the case where the sewn product holding portion 28 is inclined due to an attachment error of the sewn product holding portion 28 or the like, or the sewn product support portion 4. The two fingers 38 and 40 can both come into contact with the sewn product 12 even when there are irregularities on the surface or when the sewn product 12 itself has a step.
[0024]
After the fingers 38 and 40 come into contact with the sewing product 12, the fingers 38 and 40 are closed, and the sewing product 12 can be held between the fingers 38 and 40. When the sewing product holding portion 28 holding the sewing product 12 is lifted by the air cylinder 22 and separated from the sewing product support portion 4, the chuck 42 is reversed by the action of the tension spring 52 around the swing fulcrum shaft 46. 2 (counterclockwise: arrow D direction) and return to the original position (oscillation origin position) shown in FIG.
[0025]
5 and 6 show a sewn product clamping portion 128 of a second embodiment of a cloth moving device for an automatic sewing machine according to the present invention, FIG. 5 is a front view thereof, and FIG. 6 is a side view showing a part thereof in section. FIG. The sewn product sandwiching portion 128 according to this embodiment is different from the sewn product sandwiching portion 28 according to the first embodiment in that a swing fulcrum shaft 46 that is a swing center of the chuck 42 according to the first embodiment, and That is, the upper and lower positional relationship with the second spring hook 50 is reversed, and the arrangement of the swing fulcrum plate 44 and the tension spring 52 is changed accordingly. More specifically, in the first embodiment, the second spring hook 50, the first spring hook 48, and the swing fulcrum shaft 46 are arranged in order from above. In the embodiment, the swing fulcrum shaft 46, the first spring hook 48, and the second spring hook 50 are arranged in order from above. The other components are the same as those in the example of FIGS. 1 to 3, and the operation described with reference to FIG.
[0026]
7 and 8 show a sewn product clamping portion 228 of a third embodiment of a cloth moving device for an automatic sewing machine according to the present invention, FIG. 7 is a front view thereof, and FIG. 8 is a side view showing a part thereof in cross section. FIG. The sewn product clamping unit 228 according to this embodiment is different from the sewn product clamping unit 28 according to the first embodiment in that a compression spring is used in place of the tension spring 52 according to the first embodiment. Accordingly, a compression spring body 250 containing a compression spring (not shown) is fixed to the bracket 36 instead of the second spring hook 50 of the embodiment of FIG. A rod 252 that is urged upward and moves up and down in the vertical direction protrudes, and an abutting member 253 that abuts against the spring pad 48 is provided at the upper end of the rod 252. The other components are the same as those in the example of FIGS. 1 to 3, and the operation described with reference to FIG. Since the spring pad 48 has the same structure as the first spring hook 48 of the first embodiment, the same reference numeral is attached.
[0027]
9 and 10 show a sewn product clamping portion 328 of a fourth embodiment of a cloth moving device for an automatic sewing machine according to the present invention, FIG. 9 is a front view thereof, and FIG. 10 is a side view showing a part thereof in cross section. FIG. The sewn product sandwiching portion 328 according to this embodiment is different from the sewn product sandwiching portion 28 according to the first embodiment in that a leaf spring 352 is used instead of the tension spring 52 according to the first embodiment. Accordingly, a spring support 350 is fixed to the bracket 36 instead of the second spring hook 50 of the embodiment of FIG. The plate springs 352 are arranged in a vertical direction, and are formed as a set of two pieces, with the upper ends fixed to the spring support portion 350, and the lower ends arranged so as to sandwich the spring pad 48 between the two plate springs 352. . The other components are the same as those in the example of FIGS. 1 to 3, and the operation described with reference to FIG. Since the spring pad 48 has the same structure as the first spring hook 48 of the first embodiment, the same reference numeral is attached.
[0028]
FIG. 11 is a diagram showing a sewn product clamping portion 328 of a fifth embodiment of a cloth moving device for an automatic sewing machine according to the present invention. The fabric movement device according to this embodiment is an example in which two sewn product clamping portions 28 according to the first embodiment are used. Specifically, both the sandwiching portions 28 and 28 are arranged side by side in a direction orthogonal to the opening and closing direction of the fingers 38 and 40 in which the opening and closing directions of the fingers 38 and 40 (the EF direction in the figure) are the same. The number of sewn product sandwiching portions 28 is not limited to two, and a plurality of sewn product sandwiching portions 28 may be arranged side by side.
[0029]
The automatic sewing machine cloth transfer device of the present invention has been described based on the embodiments shown in the drawings, but the present invention is not limited to these embodiments, and within the scope of the invention described in the claims. Various modifications are possible.
For example, in the present embodiment, the fingers 38 and 40 of the sewn product sandwiching portion 28 are configured to make an arc motion, but the fingers 38 and 40 are arranged to face each other in parallel so that contact and separation are performed by parallel movement. It may be. In this case, since the fingers 38 and 40 perform the clamping operation, the sewn product clamping portion 28 does not lift, so that it is not necessary to consider the force for contracting the rod 22a with respect to the cylinder 22.
[0030]
【The invention's effect】
According to the present invention, the sewn product that has two abutment portions that can be brought into contact with the sewn product on the sewn product support portion of the sewing machine and can be opened and closed, and clamps the sewn product by closing the two abutment members. A straight line connecting the tips of the fingers, since it comprises a clamping part, a vertical movement means for moving the sewing product clamping part up and down, and a swinging device that swings the sewing product clamping part in a direction substantially the same as the opening / closing direction of the contact part Even when the upper surface of the sewn product clamping portion is not parallel, the sewn product can be securely clamped.
[Brief description of the drawings]
FIG. 1 is a perspective view of a sewing machine in which a first embodiment of a fabric moving apparatus according to the present invention is incorporated.
FIG. 2 is a front view of a sewn product holding portion of the cloth movement device shown in FIG. 1;
3 is a side view showing a cross section of a part of a sewn product holding portion of the cloth movement device shown in FIG. 1; FIG.
FIG. 4 is a front view for explaining the operation of the cloth movement device according to the present embodiment.
FIG. 5 is a front view of a sewn product sandwiching portion of a second embodiment of a fabric movement device according to the present invention.
6 is a side view showing a part of the sewn product holding portion of FIG. 5 in cross section.
FIG. 7 is a front view of a sewn product sandwiching portion of a third embodiment of a fabric movement device according to the present invention.
FIG. 8 is a side view showing a part of the sewn product sandwiching portion of FIG. 7 in cross section.
FIG. 9 is a front view of a sewn product holding portion of a fourth embodiment of a fabric movement device according to the present invention.
FIG. 10 is a side view showing a part of the sewn product sandwiching portion of FIG. 9 in cross section.
FIG. 11 is a diagram showing a sewn product holding portion of a fifth embodiment of a fabric movement device according to the present invention.
FIGS. 12A and 12B are simplified views showing a sewn product clamping unit of a cloth movement device according to a conventional example, in which FIG. 12A shows a state waiting on the sewn product, and FIG. 12B shows a state in contact with the sewn product; (C) shows a state in which the two fingers are closed and the sewn product is clamped.
13 is a simplified diagram for explaining that a situation in which a sewn product cannot be clamped may occur when the straight line connecting the tips of the fingers of the sewn product clamping unit in FIG. 12 and the top surface of the sewn product clamping unit are not parallel; (A) shows a state of waiting above the sewing product, (B) shows a state where one finger is in contact with the sewing product, and (C) holds the sewing product even when two fingers are closed. Indicates an incapable state.
[Explanation of symbols]
EF Opening and Closing Direction of Two Fingers (Abutting Portions) 2 Sewing Machine Frame 4 Sewing Product Support 6 Sewing Machine Head 8 XYZ Axis Drive Device 10 Cloth Pressing Device 12 Sewing Material 14 Material Transfer Device 16 Frame 18 Rotating Arm 20 Air Cylinder 22 Air Cylinder (vertical movement means)
22a Rod 24 Bearing 26 Vertical shaft 28 Sewing product clamping part 30 Connection part 32 Connection part 34 Arm 36 Bracket 38, 40 Finger (contact part)
42 Chuck 44 Oscillating fulcrum plate 46 Oscillating fulcrum shafts 46a, 48a Through hole 48 First spring hook 50 Second spring hook 52 Tension spring (elastic means)
104 Sewing product support portion 112 Sewing product 122 Vertical movement means 128 Sewing product holding portion 138, 140 Finger 228 Sewing product holding portion 250 Compression spring body (elastic means)
252 Rod 253 Abutting member 328 Sewing product clamping part 350 Spring support part 352 Leaf spring (elastic means)
428 Sewing product clamping part

Claims (2)

A sewn product sandwiching part that has two abutting parts that can contact and can be opened and closed with the sewn product on the sewn product support part of the sewing machine, and that sews the sewn product by closing the two abutting members;
A vertically moving means for vertically moving the sewing product sandwiching portion;
A swinging device for swinging the sewn product sandwiching portion in a direction substantially the same as the opening / closing direction of the contact portion;
An automatic sewing machine cloth transfer device characterized by comprising: The cloth moving device for an automatic sewing machine according to claim 1, wherein the swinging device is:
A bracket vertically moved by the vertically moving means;
A swing fulcrum shaft fixed to the sewn product holding portion and rotatably connected to the bracket;
Elastic means provided between the bracket and the sewn product sandwiching portion, and biasing the sewn product sandwiching portion to the swinging origin position;
An automatic sewing machine cloth transfer device characterized by comprising:

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