JP2734069B2 - Sewing machine feeder - Google Patents

Description

The present invention relates to a feeder for a sewing machine, and more particularly to a feeder for a sewing machine having a positioning member for holding and positioning a work cloth.

[Related Art] Conventionally, there is a rubber boat or the like in which a reinforcing seam is formed around an air supply hole. When the stitch is formed by a conventional cycle sewing machine, the work cloth is sandwiched between a pair of holding plates having an exposure hole slightly larger than the hole formed in the work cloth, and processing is performed from the exposed hole of the holding plate. The edge of the hole in the cloth was exposed, and a closed stitch was formed at the edge of the hole.

[Problems to be Solved by the Invention] However, even when the pair of holding plates are used, particularly when the hole is large, the edge portion is not reliably held, and the feeding device is not provided with respect to the sewing needle. There has been a problem that the hole shape of the work cloth is distorted during relative movement, or the edge of the hole fluctuates up and down, so that sewing cannot be performed accurately.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sewing machine feeding device that solves the above-described problem and reliably holds an edge of a hole formed in a work cloth and can perform accurate sewing on the edge of the hole. It is in.

[Means for Solving the Problems] In order to solve the above problems, a feeder according to the present invention comprises a feed table movably provided along a plane substantially perpendicular to a vertical movement path of a needle, and a feeder formed on a work cloth. While holding the work cloth at a predetermined distance outside the hole from the edge of the hole made,
A cloth holding member integrally moving along the plane with the movement of the feed stand along the plane, and having an outer shape capable of fitting into the hole of the work cloth held by the cloth holding member, A positioning member integrally moving along the plane along with the movement with the feed base, and a position defined between an edge of a hole of the work cloth and a holding position of the work cloth by the cloth holding member. In order to form a stitch in the area, the feed base is moved along the plane.

In addition, it is preferable to provide a locking projection on the outer peripheral surface of the positioning member for restricting a vertical displacement of the work cloth.

[Operation] The cloth holding member holds the work cloth at a position spaced a predetermined distance outside the hole from the edge of the hole formed in the work cloth, while the positioning member fits into the hole formed in the work cloth. The hole is held so that the hole shape does not collapse. In this state, the cloth holding member, the positioning member and the work cloth are integrated with the feed base.
Then, in this state, the feed means is moved by the driving means along a plane substantially perpendicular to the vertical movement path of the needle,
By moving the needle up and down, a seam is formed in a region defined between the edge of the hole of the work cloth and the position where the work cloth is held by the cloth holding member.

In addition, the locking projection on the outer peripheral surface of the positioning member regulates the edge of the hole formed in the work cloth from shifting vertically,
Holds the work cloth more reliably.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

First, a sewing product manufactured by the sewing machine according to the present embodiment will be described.

As shown in FIG. 5 (a), in a pre-process performed prior to the sewing of the present embodiment, a substantially circular cloth C2 having a smaller area than the cloth C1 is superimposed on the cloth C1 to form a plane circular sewing. An eye S is formed and both fabrics C1 and C2 are sewn together. Next, as shown in FIG. 5 (b), the sewn fabrics C1 and C2
After forming a hole H concentric with the seam S inside the circular seam S, the cloth C2 is folded inside the hole H as shown by the arrow in the figure. Then, as shown in FIG. 5 (c),
The vertical relationship between the dough C1 and the dough C2 is reversed, and a ridge M1 formed by folding the dough C1 is provided at the edge of the hole H.
A crest M2 formed by folding back the fabric C2 is formed, and a valley V is formed between both crests M1 and M2. And
In the sewing process of the present embodiment, the cloth in the state shown in FIG. 5 (c) is used as the work cloth C, and the cloth holding plate 22 as a plate material is fitted in the hole H at the position shown by the one-dot chain line in the figure. The reinforcement sewing is performed concentrically with the hole H.

Now, as shown in FIG.
On the upper side, a feed table 1 is provided which can be moved in the X and Y directions along the work cloth support surface P by a driving means (not shown). The feed table 1 has a main body 1a and a cassette 2 as a cloth holding member which is detachably attached to a front end of the main body 1a.

As shown in FIGS. 2 and 3, the cassette 2 is a pair of holding plates having a plane rectangular shape and a circular exposed hole 3 formed at the center.
2a and 2b, which are screwed openably and closably at the tip. Then, the cassette 2 holds the work cloth C between the holding plates 2a and 2b to expose the hole H from the exposure hole 3.

In the hole H of the work cloth C exposed from the exposure hole 3, a cloth holding plate 22 as a positioning member for maintaining the hole shape is detachably fitted.

As shown in FIGS. 1 and 2, the cloth holding plate 22 is formed in a ring shape, and a concentric fitting concave portion 23 is formed in the center of the opening peripheral edge. In addition, as shown in FIG. 4, on the outer peripheral surface of the cloth holding plate 22, the upper end and the lower end thereof are provided to prevent the edge of the hole H of the work cloth C from shifting vertically. The locking projections 24 and 25 are each formed in a flange shape over the entire outer periphery, and the cloth holding plate 22
On the outer peripheral surface, a locking projection 26 is also formed in a flange shape over the entire outer periphery at an intermediate position between both locking projections 24 and 25. When the cloth holding plate 22 is fitted into the hole H of the work cloth C, the crest M2 of the cloth C2 is held between the locking projections 24 and 26, and the locking projections 25 and The crest M1 of the dough C1 is held during 26.

On the other hand, as shown in FIG. 2, a pair of columns 4 (only one is shown) is provided at a predetermined interval above the rear part of the feed table 1. At the base end of each column 4, a support arm 5 extending in the forward direction of the feed bar 1 is provided with a shaft 5a at its base end.
Is rotatably supported. As shown in FIGS. 1 to 3, connecting members 10 each having an L-shaped cross section are attached to the ends of both support arms 5, and an elevating body 11 is provided between these connecting members 10. I have. A pair of connecting plates 7 (only one is shown) disposed on both sides of the air cylinder 6 and each supporting arm 5 are rotatably supported by a shaft 6a at the distal end of each of the columns 4. An L-shaped arm 8 is rotatably supported on each support arm 5 by a shaft 8a, and a piston 6b of an air cylinder 6 is rotatably supported on one end of the L-shaped arm 8 via a bracket 9 by a shaft 9a. At the same time, the distal end of the connecting plate 7 is rotatably connected to the other end of the L-shaped arm 8 by a shaft 7a. Therefore, based on the operation of the air cylinder 6, the elevating body 11 moves between the operation position shown in FIG. 2 and the standby position separated upward from the work cloth support surface P via the connecting plate 7 and the L-shaped arm 8 and the like. It is raised and lowered between.

By the way, in front of the elevating body 11, an attaching member 21 is detachably fitted to the fitting concave portion 23 of the cloth holding plate 22, and a pair of bearing portions 21a protrude from the upper surface thereof. . A driven shaft 20 is rotatably supported between the bearing portions 21a, and a pair of second legs 18 are fixed to the driven shaft 20 at their base ends so as to be integrally rotatable.

On the other hand, as shown in FIG. 1, a bearing 11b is protruded from the lower surface of the central portion of the elevating body 11, and the drive shaft 14 is rotatably supported by the bearing 11b. This drive shaft 14
A first leg 16 extending perpendicularly to the axial direction of the drive shaft 14 is attached to a front end of the drive shaft 14 so as to be integrally rotatable at a base end.

A shaft 17 for arranging the drive shaft 14 and the driven shaft 20 on the same axis is provided between the first leg 16 and the second leg 18. That is, the tip of the first leg 16 is fixed to one end of the shaft 17, and each second leg 16
The tip of 18 is inserted into the shaft 17 so as to be position-adjustable, and is fixed at an arbitrary adjustment position on the shaft 17 by a screw 19, respectively. And the drive shaft 14,
First leg 16, shaft 17, second leg 18, and driven shaft 20
This constitutes a reversing crank B that can rotate integrally around one fixed axis passing through the drive shaft 14 and the driven shaft 20.

A drive gear 15 is mounted on the rear end of the drive shaft 14 so as to be integrally rotatable. On the other hand, a rotary air cylinder 12 that can rotate forward and reverse is supported on a motor support portion 11a protruding in the shape of an arch on the upper surface side of the central portion of the elevating body 11, and an output shaft 12a is mounted on the output shaft 12a so as to be integrally rotatable. The gear 13 and the drive gear 15 are meshed. Therefore, as shown in FIGS. 1 and 3, the reversing crank B is driven by the rotation of the rotary air cylinder 12 in the forward direction or the reverse direction, and through meshing of the output gear 13 and the drive gear 15, the solid line in FIG. It is reversed and moved between the indicated standby position and the retracted position indicated by the two-dot chain line.

Next, using the feeding device configured as described above,
The operation when reinforcing stitching is performed on the edge of the hole H formed in the work cloth C will be described.

In the standby state of the sewing machine, the lifting body 11 is moved by the operation of the air cylinder 6 shown in FIG.
The reversing crank B and the attachment member 21 are arranged at an upper standby position, and are arranged at an upper position at a distance from the cassette 2.

Therefore, in order to form a seam around the hole H of the work cloth C, the work cloth C is placed between the upper and lower holding plates 2a, 2b of the cassette 2 so that the cloth C2 faces up as shown in FIG. At the center of the exposed hole 3 of the cassette 2.
After arranging the holes H, the cassette 2 is attached to the feed base 1. Further, the cloth holding plate 22 is fitted into the hole H of the work cloth C, and as shown in FIG. 4, between the locking protrusions 24 and 26 and between the locking protrusions 26 and 25 of the cloth holding plate 22, respectively. The ridges M2 and M1 of the work cloth C are pushed in, and the cloth holding plate is placed on the valley V of the work cloth C.
The 22 locking projections 26 are made to enter. Then, the hole H of the work cloth C
Is held by the cloth holding plate 22 so that its circular shape does not collapse, and the edge is restricted from shifting in the vertical direction as a free end.

In the above state, the lifting body 11 is actuated by the action of the air cylinder 6.
Moves down to the operation position shown by the solid line in FIG. Accordingly, the attaching member 21 is fitted into the fitting concave portion 23 of the cloth holding plate 22.
Thus, the connection between the cloth holding plate 22 and the feed base 1 is completed, and the cassette 2, the cloth holding plate 22 and the feed base 1 are integrated.

Next, the cassette 2, the cloth holding plate 22, and the feed base 1 are moved integrally on the work cloth support surface P by the action of an X, Y driving device (not shown) as drive means, and the holes of the work cloth C are moved based on the movement. The sewing start position near the edge of H is positioned relative to the sewing needle N and the well-known intermittent presser L of the stitch forming means shown by a two-dot chain line in FIG. The X, Y driving device is constituted by a pair of pulse motors operatively connected to the feed base 1 to move the feed base 1 in the X direction and the Y direction, respectively. The rotation is driven based on the determined X, Y feed data.

In this state, the sewing operation is started, the sewing needle N is moved up and down, and the work cloth C is moved in the X and Y directions in synchronization with the up and down movement. A seam is formed. Then, when a seam of about half a circumference is formed at the edge of the hole H of the work cloth C, the rotary air cylinder 12 is operated to avoid interference between the sewing needle N and the reverse crank B,
The reversing crank B rotates 180 degrees from the solid line position in FIG. 3 to the retracted position shown by the two-dot chain line. By retreating the reversing crank B, a stitch can be continuously formed on the remaining half circumference of the edge of the hole H of the work cloth C. Then, when the work cloth C returns to the sewing start position, a seam closed concentrically with the hole H is formed at the edge of the hole H of the work cloth C, and the reinforcement sewing on the work cloth C is completed.

When the sewing is completed, the cassette 2 and the cloth holding plate 22 move together with the feed table 1 on the work cloth supporting surface P and return to the initial standby position. The elevating body 11 is an air cylinder 6
Is returned to the upper standby position again by the action of
The fitting between the attachment member 21 and the attachment member 21 is released, and the work cloth C can be replaced.

As described above, according to the feeder of the present embodiment, the hole H formed in the work cloth C is held by the cloth holding plate 22 so that the circular shape of the hole H does not collapse. Sewing is performed accurately, and a strong and beautiful seam can be reliably formed. Further, the edge of the hole H of the work cloth C is regulated by the locking projections 24, 25 and 26 formed on the outer periphery of the cloth holding plate 22 so as not to shift in the vertical direction. More securely.

On the other hand, the first leg 16 and the second leg 18 of the reversing crank B are
Is adjustable, and the distance from the front end of the feed base body 1a to the attachment member 21 can be arbitrarily changed within the length of the shaft 17. Therefore, the position of the cloth holding plate 22 can be adjusted back and forth without replacing the reversing crank B. The attachment member 21 is attached to the cloth holding plate 22.
The delicate position adjustment for fitting can be easily performed.

Further, by attaching the attachment member 21 and the cloth holding plate 22 separately, the cloth holding plate 22 is previously inserted into the hole H of the work cloth C before the cassette 2, the cloth holding plate 22 and the feed base 1 are integrated. Since the fitting can be performed, it is easy to fit the cloth holding plate 22 into the hole H. Therefore, as compared with the case where the cloth holding plate 22 is attached and fixed to the tip of the reversing crank B and is fitted into the hole H of the work cloth C, the reversing crank B does not become a hindrance, and Very good.

Further, since the attachment member 21 and the cloth holding plate 22 are separated from each other, even when the size of the hole H of the work cloth C is changed, it can be easily dealt with only by changing the size of the cloth holding plate 22. By preparing a plurality of cloth holding plates 22, the cloth holding plate 22 is fitted into the hole H of the next work cloth C during sewing of one work cloth C to prepare for sewing. Work time can be effectively used.

The present invention is not limited to the above embodiment, and may be implemented as follows. (1) Changing the outer shape of the cloth holding plate to an elliptical shape, a square shape, or the like.

(2) A fixing means such as a screw for fixing the cloth holding plate to the attachment member is provided.

(3) The locking projections on the outer periphery of the cloth holding plate are only the upper and lower ends of the outer periphery. In addition, it is not necessary to form the locking projection on the outer peripheral portion in a flange shape over the entire outer peripheral portion, and it is configured by a plurality of discontinuous locking projections.

(4) A cloth holding plate capable of holding a hole shape by simply fitting into a hole formed in a work cloth without forming any locking projection on the outer peripheral portion of the cloth holding plate.

(5) The feeder of the present invention is embodied in a sewing machine for sewing labels.

[Effects of the Invention] As described above in detail, according to the present invention, an edge of a hole formed in a work cloth can be reliably held, and an accurate sewing can be performed on the edge of the hole. It has the effect.

[Brief description of the drawings]

1 to 4 show an embodiment of the present invention.
FIG. 2 is a perspective view showing a cloth holding plate and a reversing crank, FIG. 2 is a side view showing the entire feeding device, FIG.
The figure is a partially enlarged sectional view of the cloth holding plate, and FIGS. 5 (a) to 5 (c).
FIG. 4 is an explanatory view showing a pre-production step of a work cloth used for sewing. 1 .... feeding stand, 2 .... cassette as cloth holding member, 22
... Cloth holding plate as positioning member, 24-26. Locking projection, C. Work cloth, H. Hole, N. Sewing needle, P. Work cloth support surface as plane.

Claims (2)

(57) [Claims] 1. A feed base (1) movably provided along a plane (P) substantially perpendicular to a vertical movement path of a needle (N), and a hole (H) formed in a work cloth (C). The work cloth (C) is held at a position spaced a predetermined distance outside the hole from the edge of the work table (C), and the work cloth (1) is integrally moved along the plane (P) with the movement of the work table (1). A moving cloth holding member (2), and having an outer shape capable of fitting into the hole (H) of the work cloth (C) held by the cloth holding member (2), together with the feed table (1). A positioning member (22) that moves integrally along the plane (P) with the movement, an edge of the hole (H) of the work cloth (C), and processing by the cloth holding member (2). In order to form a seam in an area defined between the cloth (C) and the holding position, the feed table (1) is moved along the plane (P). Sewing feeder being characterized in that a driving means for moving Te. 2. An outer peripheral surface of the positioning member (22) has locking projections (24 to 24) for restricting the work cloth (C) from shifting in the vertical direction.
26. The sewing machine feeding device according to claim 1, wherein 26) is provided.