JPH0661399B2 - Sewing machine cloth feeder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth feeding device applied to a sewing machine used for sewing four sides of a cloth such as a scarf.

[0002]

2. Description of the Related Art When sewn on four sides of a cloth such as a scarf, for example, the edges of the cloth are rounded with a width of about 2 mm and the rounded portion is sewn. However, there is a drawback that when the thread is unwound in one place, it is unwound. For this reason, it is performed to separately sew the starting end portion of the cloth.
Then, after this gathering work, rake sewing is performed.In the rake sewing machine, a needle plate that supports the upper surface of the cloth, a pressing plate that supports the cloth from below, and these needle plates and the like are provided near the sewing needle. Is provided with a feed dog that locks the fabric at the front position in the feeding direction of the fabric and feeds it forward, and holds the fabric between the needle plate and the pressing plate while allowing the sewing needle to face through the hole formed in the needle plate. The fabric is sewn together and is fed forward by the feed dog.

[0003]

However, with such a technique, the cloth is clamped between the needle plate and the pressing plate, and the cloth is locked by the feed dog at a position forward of the sewing needle in the feed direction. Since the fabric is fed while moving, when arranging the fabric at the initial position, a grip margin corresponding to at least the distance from the sewing needle to the feed dog is required at the sewing start end of the fabric. Therefore, there is a problem that the cloth cannot be sewn from the beginning by the amount of the gripping margin, and an unsewn portion is generated at the end of the cloth.

It is an object of the present invention to allow fabric to be sewn from the edges.

[0005]

In order to solve the above-mentioned problems, the present invention sewes a fabric in which a residual thread sewn at the end of the fabric is pulled out to the end of the fabric, and the end is sewn. In the cloth feeding device described above, an intermittent feed roller for pulling the remaining thread in synchronization with the operation of the sewing needle, and an intermittent feed roller at a position in front of the pressing plate that presses the cloth near the sewing needle in the feeding direction of the cloth. The present invention is characterized in that a gripping tool that holds the tip of the residual thread on which the roller is stretched and a pressing roller that clamps the residual thread between the intermittent feed roller are provided.

Further, in the cloth feeding apparatus according to the second aspect of the present invention, the pressing roller is supported so as to be movable toward and away from the intermittent feeding roller, and is held by the pressing roller from the retracted position. It is characterized in that a driving unit that moves and contacts the intermittent feed roller is connected.

[0007]

According to the cloth feeding device of the present invention, the cloth is arranged in front of the pressing plate without pressing the end of the cloth by the pressing plate, and the residual yarn pulled out from the end is transferred to the intermittent feeding roller. By stretching and holding the yarn on the gripping tool and driving the sewing machine while sandwiching the remaining yarn between the intermittent feeding roller and the pressing roller, the cloth can be fed while the remaining yarn is pulled by both rollers.

In the cloth feeding apparatus according to the second aspect of the present invention, the pressing roller can be moved, and when the remaining yarn is arranged at the initial position, the pressing roller is retracted from the intermittent feeding roller to facilitate the work. Further, when the sewing machine is driven, the pressing roller can be brought into contact with the intermittent feed roller by the drive unit to apply the driving force to the remaining yarn.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the cloth feeding apparatus of the present invention will be described below with reference to the drawings. As shown in FIG. 6, the cloth 1 used in the cloth feeding apparatus of this embodiment is pre-sewn with only the ends rounded at the edges, and the remaining thread 2 is pulled out from the ends by about 10 cm to 15 cm. It is in a state. The cloth feeding device is applied to a rake stitch sewing machine, and as shown in FIG. 1, a sewing needle 5 and a needle plate 6 for supporting the upper surface of the cloth 1 are provided at the tip of the frame 4 of the sewing machine main body 3.
And a feed dog 7 for feeding the cloth 1 forward while locking the cloth 1, and a pressing plate 9 for sandwiching the cloth 1 with the needle plate 6 on the bed 8 facing these needle plates 6 and the like. Between the needle plate 6 and the pressing plate 9, there are provided a guide folder 10 which guides the cloth 1 while rolling the edge of the cloth 1, an intermittent feeding roller 11, a gripping tool 12, a pressing roller 13 and the like according to the novel features of the present invention. It is provided.

The sewing needle 5 is formed in a substantially arc shape,
Attached to the shaft 15 protruding at the tip of the frame 4,
By intermittently rotating the shaft 15 in both the forward and reverse directions, the cloth 1 is sewn while being swung in a direction orthogonal to the plane of FIG.

The needle plate 6 is fixed to the frame 4 at a position forward of the sewing needle 5 in the feeding direction of the cloth 1, and the frame 4
It is horizontally provided at the tip of the bracket 16 fixed to the. The needle plate 6 is formed with a groove 17 for inserting the sewing needle 5 and a groove (not shown) for arranging the feed dog 7.

The feed dog 7 has a plurality of protrusions 7a that bite into the cloth 1 formed on the lower surface thereof in the shape of a sawtooth, and is attached to the frame 4 at a position forward of the cloth 1 further than the position where the needle plate 6 is attached. The drive arm 1 is supported and attached to the tip of a drive arm 18 protruding from the frame 4.
The cloth 1 is moved in the front-rear direction and is moved in the up-and-down direction at both end positions in the moving direction so as to pull in the fabric 1 and intermittently feed it forward.

The pressing plate 9 is horizontally arranged so as to face the lower surface of the needle plate 6, and is constantly urged upward by a tension coil spring (not shown) provided on a drive unit 19 in the bed 8 to urge the cloth 1 to move. It is designed to hold down.

The guide folder 10 is formed by rolling a metal plate into a leaf shape, and by feeding the cloth 1 while inserting the edge portion of the cloth 1, the edge portion of the cloth 1 is rolled and the space between the needle plate 6 and the pressing plate 9 is rounded. I can guide you to.

When the cloth 1 is sewn by the sewing needle 5, the feed dog 7 is separated from the cloth 1 between the needle plate 6 and the pressing plate 9 when the cloth 1 is sewn by the sewing needle 5. On fabric 1
And the sewing needle 5 is separated from the cloth 1, the feed dog 7
Is for pressing the cloth 1 and moving the cloth 1 forward by a certain amount.

On the other hand, the intermittent feed roller 11 has a needle plate 6
A part of the peripheral surface of the cloth 1 is horizontally supported at a position further forward than the pressing plate 9 in the feeding direction, with its peripheral surface substantially level with the lower surface of the needle plate 6.
The rotation is intermittently driven in synchronism with the cloth feed by the feed dog 7. The transmission mechanism 21
As shown in FIGS. 2 and 3, a crank arm 23 is connected to an eccentric crank 22 that is rotated by a drive unit, and a slider 24 attached to the tip of the crank arm 23 has a guide groove 26 of an adjusting lever 25. The adjusting lever 25 is supported by a support shaft 28 via a one-way clutch 27, and the intermittent feed roller 1 is supported by the support shaft 28.
1 is fixed, and a crank arm 23 driven by an eccentric crank 22 swings an adjusting lever 26 to intermittently rotate a support shaft 28 in only one direction via a one-way clutch 27. It is something like this. A one-way clutch 31 that allows only rotation in a direction opposite to the one-way clutch 27 is provided between the support shaft 28 and a bearing 30 supported by a bracket 29 on the sewing machine main body 3, and Care is taken so that no return occurs. In addition, in FIG. 2 and FIG.
Reference numeral 32 denotes a bearing which is paired with the bearing 30 to support the support shaft 28 on the sewing machine main body 3, and reference numeral 33 denotes a collar which is fixed to the outer peripheral portion of the support shaft 28 at the mounting position of the one-way clutches 27, 31.

The gripping tool 12 is provided below the intermittent feed roller 11 as shown in FIG.
In the illustrated example, a tightly wound coil spring capable of gripping the remaining yarn 2 of the fabric 1 is used. That is, the needle plate 6 and the pressing plate 9
The remaining yarn 2 stretched around the intermittent feed roller 11 via the space between the and is hung downward from the intermittent feed roller 11 and the tip end thereof is sandwiched between the wires of the closely coiled coil spring 12, The configuration is such that the remaining yarn 2 is gripped.

The pressing roller 13 is used for the bed 8
It is attached to the tip of the lever 41 supported by
The lever 41 is supported so as to be swingable in a vertical direction about a shaft 42, and the swinging of the lever 41 causes the pressing roller 1 to move.
Reference numeral 3 is adapted to reciprocate between a chain line position in FIG. 1 in contact with the intermittent feed roller 11 and a solid line position retracted from the intermittent feed roller 11. As shown in FIG. 5, the drive unit 43 that reciprocates the pressing roller 13 supports the lever 41 swingably on the shaft 42 fixed to the sewing machine main body 3 by the bracket 44, and The pressing roller 13 is supported by a support shaft 45 attached to one end of the lever 41, while an air cylinder 47 is connected to the other end of the lever 41 via a link 46 to drive the air cylinder 47. Axis 42
The lever 41 is swung around to bring the pressing roller 13 into contact with the intermittent feed roller 11, and the air cylinder 47
By releasing the driving force of the pressing roller 13, the lever 41 is swung by the weight of the pressing roller 13 and the pressing roller 1
3 is separated from the intermittent feed roller 11.

When the fabric feeding device having the above-mentioned structure is used to sew the fabric 1 such as a scarf while rolling the edges of the fabric 1, only the end of the fabric 1 is sewn in advance, and at that time, the remaining thread 2 is removed from the end of the fabric 1. It is done to pull out. And
When arranging the cloth 1 at the initial position of the sewing machine, the end portion of the cloth 1 is inserted into the guide folder 10 and the residual thread 2 pulled out from the end is inserted between the needle plate 6 and the pressing plate 9. , And stretch it on the intermittent feed roller 11,
The tip is fixed by the gripping tool 12.

When the sewing machine is driven, the feed dog 7 comes into contact with the remaining thread 2 in synchronism with the driving of the sewing needle 5, and the intermittent feed roller 11 rotates intermittently to apply a driving force to the cloth 1. However, the fabric 1 cannot be fed only by the driving force of the feed dogs 7 and the like because it acts through the residual thread 2 and it is difficult for the air cylinder 47 in the pressing roller 13 to move. By swinging 41 to press the pressing roller 13 against the intermittent feed roller 11, the residual yarn 2 is sandwiched between the rollers 11 and 13, and the residual yarn 2 is driven by the driving force of the intermittent feed roller 11 at that time. Is pulled and the cloth 1 is fed between the needle plate 6 and the pressing plate 9. Then, after the cloth 1 is fed by the intermittent feed roller 11 and the pressing roller 13, the driving force of the air cylinder 47 is released, and the pressing roller 13 is separated from the intermittent feeding roller 11. Therefore, it is only necessary to release the fixed state of the remaining thread 2 by the grasping tool 12 and thereafter sew the cloth 1 by a normal operation. During this normal operation, the fabric is the intermittent feed roller 11
Therefore, the pressing roller 13 is retracted from the vicinity of the intermittent feeding roller 11, so that the cloth feeding does not become an obstacle.

Since the residual thread 2 after sewing the end portion of the cloth 1 in this way is used to feed the cloth 1,
The cloth 1 itself does not require a gripping margin, and can be sewn directly from the end of the cloth 1.

Although the pressing roller is driven by the air cylinder in the above-described embodiment, it may be driven by another driving mechanism, and the moving direction thereof is not limited to the swinging motion but is linear. It may be a move. Further, other clamps or the like may be used as long as the grasping tool can grasp the remaining thread.

[0023]

As is apparent from the above description, according to the cloth feeding apparatus of the present invention, the following effects can be obtained. (A) without pressing the edge of the cloth with the pressing plate,
Since the cloth is fed by sandwiching and pulling the residual yarn pulled out from the end portion between the intermittent feed roller and the pressing roller, it is not necessary to secure a grip margin, and the cloth is fed to the end portion. Can be effectively sewn from. (B) According to the cloth feeding device of the second aspect, when the remaining yarn is arranged at the initial position, the pressing roller is retracted from the intermittent feeding roller and is brought into contact with the sewing machine when it is driven. Therefore, the remaining thread can be easily placed in the initial position, and by retracting it even after the end of the fabric has been sewn, there is no hindrance to the subsequent feeding of the fabric, and smooth operation is possible. It can be performed.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a cloth feeding device of the present invention.

FIG. 2 is a vertical cross-sectional view showing a transmission mechanism of the intermittent feed roller in FIG.

FIG. 3 is an exploded view of the transmission mechanism of FIG.

FIG. 4 is a perspective view of the intermittent feeding roller and the gripping tool in FIG.

5 is an exploded assembly view showing a drive unit of the pressing roller in FIG. 1. FIG.

FIG. 6 is a perspective view of an end portion of a fabric applied to the fabric feeding device of the present invention.

[Explanation of symbols]

1 ... Cloth, 2 ... Remaining thread, 3 ... Sewing machine body, 4 ... Frame, 5 ... Sewing needle, 6 ... Needle plate, 7 ... Feed dog, 8 ... Bed,
9 ... Press plate, 10 ... Guide folder, 11 ... Intermittent feed roller, 12 ... Gripping tool, 13 ... Press roller, 15 ...
Shaft, 16 ... Bracket, 17 ... Groove, 18 ... Drive arm,
19 ... Drive part, 21 ... Transmission mechanism, 22 ... Eccentric crank,
23 ... Crank arm, 24 ... Slider, 25 ... Adjusting lever, 26 ... Guide groove, 27 ... One-way clutch, 2
8 ... Support shaft, 29 ... Bracket, 30 ... Bearing, 31 ... One-way clutch, 32 ... Bearing, 33 ... Collar, 41
... Lever, 42 ... Shaft, 43 ... Drive part, 44 ... Bracket, 45 ... Spindle, 46 ... Link, 47 ... Air cylinder

Claims (2)

[Claims] 1. A fabric feeding device for a sewing machine, which sewes a fabric, wherein a residual thread sewn at the end is pulled out to an end of the fabric, the fabric feeding device further comprising a pressing plate for pressing the fabric near a sewing needle. An intermittent feed roller for pulling the remaining thread in synchronism with the operation of the sewing needle, a gripping tool for holding the tip of the residual thread stretched on the intermittent feed roller, and the intermittent feed roller at a front position in the feeding direction. A cloth feed device for a sewing machine, characterized in that a press roller for sandwiching the remaining yarn is provided between the cloth feed device and the press roller. 2. The drive roller is movably supported in a direction of approaching and separating from the intermittent feed roller, and is driven by the press roller so as to move the push roller from a retracted position and contact the intermittent feed roller. 2. The cloth feeding device for a sewing machine according to claim 1, wherein the parts are connected.