JPH0719423Y2 - Sewing machine clamp device - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a clamp device for pressing and holding a work cloth such as a body cloth or a bead cloth on a table of a sewing machine when sewing a bead sewing machine. It is about.

<Prior Art> A clamp device in this type of bead sewing machine is disclosed in Japanese Patent Publication No. 60-40313, for example. The clamp device is provided with a pair of large presser plates that press both sides of the sewing location on the work cloth onto the sewing machine table prior to sewing work such as bead sewing.

As the work cloth, as seen in the body cloth W1 shown in FIG. 3, a dart portion W1a may be formed in a part thereof. In this case, the body cloth W1 is in a state of floating at the dart portion W1a.

Therefore, in the case of forming a seam such as a bead stitch across the darts portion W1a, simply pressing both sides of the sewn portion by the large presser plate of the clamp device causes the presence of the darts portion W1a to cause the body cloth W1. Wrinkles may occur on the skin, or it may be folded at an unexpected location. As a result of this, of course, good sewing cannot be expected.

As a countermeasure against this, conventionally, a darts holding plate provided on a part of the clamp device is used to place one side of the darts portion W1a of the body cloth W1 on the sewing machine table 4 prior to the pressing of the body cloth W1 by the large pressing plate. The structure of pressing is adopted. Then, by pulling the body cloth W1 pressed by the darts holding plate toward the operator side, the darts portion W1a is flattened, and then the large holding plate is operated to press and hold the body cloth W1. Work procedures such as doing are taken.

<Problems to be solved by the invention> Since the darts pressing plate is configured to press only one point of the body cloth W1, even if the worker pulls the body cloth W1 in an attempt to flatten the darts portion W1a, New wrinkles may occur, or a part of the dart part W1a may remain floating. Therefore, a lot of time is spent on the work, and the work time greatly varies depending on the skill of the worker.

<Means for Solving the Problems> In order to solve the above problems, the sewing machine clamp device according to the present invention is configured as follows.

That is, by rotating the pair of clamp arms by their respective actuators, the large presser plates respectively provided on these clamp arms are configured to move up and down with respect to the sewing machine table, and are formed on a predetermined work cloth. When forming a stitch across the darts part,
A sewing machine clamp device capable of pressing both sides of a sewn portion onto a sewing machine table by means of the large presser plates, the clamp device being attached so as to be capable of moving up and down with respect to the clamp arms. A pair of darts pressing plates that can press two points on one side of the part and along the direction intersecting the sewing direction, and these darts pressing plates are lifted and lowered individually The actuators for the darts holding plates to be operated are provided respectively between the clamp arms and the darts holding plates, and these darts holding plates are always held in substantially the same plane position as the large holding plates. It has a return spring.

<Operation> According to the above configuration, before pressing the work cloth by the large presser plate of the clamp device, the work cloth is formed on one side of the darts portion formed on the work cloth and along the direction intersecting the sewing direction. The two points are pressed by the darts pressing plate. When the work cloth is pulled toward the operator in this state, the darts portion is flattened over a wide range determined by the two-point width pressed by the darts retainer. As a result, it is possible to satisfactorily and easily perform sewing such as beading which forms a stitch across the darts portion.

<Embodiment> Next, an embodiment of the present invention will be described with reference to the drawings.

First, in FIG. 1, which is a perspective view showing the outline of a bead sewing machine, a sewing machine main body 2 is arranged above a sewing machine table 4. A needle bar 6 is provided on the arm portion 2a of the sewing machine main body 2 so as to be vertically movable by a predetermined drive source as well known, and two needles 8 are attached to the lower ends of the needle bar 6, respectively. ing. Then, these needles 8 cooperate with a thread catcher (not shown) provided in the bed portion (not shown) of the sewing machine main body 2 to form two parallel stitches on the work cloths W1 to W3 described later. Is formed.

In the bead sewing machine of this embodiment, for example, one cutter (not shown) is provided between the two needles 8 for the needle bar 6. This cutter functions to form two parallel stitches by the needle 8 and simultaneously cut the work cloth between these stitches.

The clamp device 10 is a straight line on the upper surface side of the sewing machine table 4 from the preparation position shown by the phantom line in FIG. 1 (the position closer to the operator than the needle 8) to the sewing completed position shown by the solid line in FIG. It is arranged so that it can be moved. Also,
The clamp device 10 includes a pair of clamp arms 12. Then, each of these clamp arms 12 is configured to be individually rotated (moved up and down) with the support pin 13 as a viewpoint by the operation of each actuator 16.

In each clamp arm 12, a large presser plate 14 is provided near the tip on the side opposite to the support pin 13. The large presser plate 14 is lowered toward the sewing machine table 4 by the rotation of each clamp arm 12 based on the operation of the actuator 16.

Folding plates 18 are provided on the upper surface of the large presser plate 14, respectively. These folding plates 18 can be moved forward or backward between the left and right large presser plates 14 based on the operation of each actuator 20.

Further, a binder 24 is disposed above the preparation position of the clamp device 10 so as to be able to move up and down by the operation of an actuator (not shown). The binder 24 has a substantially T-shaped cross section, and can be lowered between the large presser plates 14 of the clamp device 10 in the preparation position.

As shown in FIG. 1, the multi-stage switch 26 using a foot switch is operated by sequentially stepping on the clamp device 10 including the actuators 16 and 20 and the individual operating mechanisms of the binder 24. However, the large presser plate 14, the binder 24, the folding plate 18, and the flap presser 22 to be described later are sequentially set to descend.

Work cloth W1 to W3 by the clamp device 10 and the binder 24
In FIG. 2 which is a partially enlarged cross-sectional view showing the clamped state of FIG. It is pressed and held on the sewing machine table 4. Further, the binder 24 descends and holds the beaded cloth W2 as a work cloth, which is set over the body cloth W1, on the sewing machine table 4 between the two large presser plates 14.
The folding plate 18 of the clamp device 10 is attached to the binder 24.
It moves forward after descending, and functions to bend the beaded cloth W2 along both sides of the binder 24 along the binder 24. The flap cloth W3 as a work cloth placed on the beaded cloth W2 as needed is processed by a pair of flap pressers 22 (see FIG. 2) provided in the clamp device 10. It is pressed and held on the folding plate 18.

Now, when the body cloth W1 which is one of the work cloth is formed with the dart portion W1a as shown in FIG. 3, and when performing the bead sewing across the dart portion W1a, the clamping device 10 is used. Before the body cloth W1 is clamped by the respective large presser plates 14, it is necessary to first flatten the darts portion W1a. Therefore, a configuration for flattening the darts portion W1a will be described.

First, one of the pair of left and right clamp arms 12 constituting the clamp device 10 (the right clamp arm in FIG. 2) is shown as a plane, and FIG. 4 and FIG.
As is apparent from FIG. 6, which is an exploded perspective view of the main members of FIGS. 4, 4 and 5, the clamp arm is shown.
Multiple mounting plates 32 (two in the drawing) on one side of 12
It is fixed by bolts 34. The darts holding plate 30 is attached to the mounting plate 32 so as to be able to move up and down at a position rearward of the large presser plate 14, that is, at a position near the support pin 13 which is the pivot fulcrum of the clamp arm 12. That is, the darts holding plate 30 has a sleeve-shaped shaft support 31a fixed to a part of a vertical piece 31 formed integrally with the darts press plate 30, and the shaft support 31a supports the mounting plate 32. It is assembled so that it can be rotated (moved up and down) by the bolt 36.

Also, a horizontal piece 33 formed by bending integrally with the mounting plate 32.
A darts pressing plate actuator 38 using a solenoid, for example, is fixed to the upper surface of the with a bolt or the like. The operating rod 40 of the actuator 38 is in contact with the upper surface of the darts holding plate 30 through the through hole 33a formed in the horizontal piece 33 of the mounting plate 32 (mainly see FIG. 5).

A return spring 42 is hung between the darts pressing plate 30 and the horizontal piece 33 of the mounting plate 32. Therefore, in the normal state, the darts holding plate 30 is held in a substantially flush position with the large pressing plate 14 at the rear position of the large pressing plate 14 (that is, the position near the support pin 13 of the clamp arm 12). Therefore, when the operating rod 40 projects downward due to the energization of the actuator 38, the darts holding plate 30 resists the elastic force of the return spring 42 and is shown by the solid line in FIG. The state turns (falls) to the state indicated by the virtual line.

The construction of the darts pressing plate 30 and its related parts shown in FIGS. 4 to 6 is the clamp arm located on the right side of FIG.
Although only 12 has been described, it goes without saying that the clamp arm located on the left side of FIG. 2 has the same configuration.

Next, a procedure of a bead sewing operation by the sewing machine having the above-described configuration will be described. First, as shown in FIG. 3, the darts portion W1
A body cloth W1 as a work cloth on which a is formed is set at the preparation position on the sewing machine table 4. Before and after this, the clamp device 10 is moved to the preparation position shown by the phantom line in FIG.

Therefore, prior to the operation of the clamp device 10 and the binder 24 by stepping on the multistage switch 26 shown in FIG. 1, the start switch 28 shown in FIG. 1, for example, is turned on. As a result, the actuators 38 for operating the darts holding plate 30 are sequentially operated, and the respective operating rods are operated.
40 each darts retaining plate 30 has its own support bolt 36
Is used as a rotation fulcrum to rotate (lower) to a state shown by a virtual line in FIG. However, since the work of clamping the work cloths W1 to W3 by the clamp device 10 and the binder 24 is not completed at this point, the sewing machine control circuit is configured so that the sewing work is not started regardless of the start switch 28 being turned on. Of course I will.

By the descent of the darts holding plate 30, the body cloth W1 as a work cloth intersects with the sewing direction indicated by the arrow P on one side (opposite to the operator) of the darts portion W1a shown in FIG. Two points A1 and A2 along the direction are pressed and held on the sewing machine table 4. In this state, when the worker pulls the body cloth W1 to the front, the darts portion W1a is stretched flat over a wide range determined by the width of the two points A1 and A2. So the first
When the multi-stage switch 26 shown in the figure is depressed to the first stage, one of the left and right large presser plates 14 of the clamp device 10 is lowered, and when the multi-stage switch 26 is depressed to the second stage, the other large presser plate 14 is depressed. The presser plate 14 descends. This makes the body cloth W1
At both sides of the portion to be sewn in, the large presser plates 14 are pressed and held on the sewing machine table 4.

Next, after placing the beaded cloth W2 as another work cloth on the body cloth W1, when the multi-step switch 26 is stepped on to the third step, the binder 24 descends and between the large presser plates 14. At, the beaded cloth W2 is pressed and held on the body cloth W1. Also, multi-stage switch
When 26 is stepped on to the third step, the folding plates 18 advance toward the binder 24, respectively, slightly behind the operation of the binder 26, and the beaded cloth W2 is bent as shown in FIG. Held in that state.

When the flap cloth W3 as a work cloth is required, the flap cloth W3 is placed on the folding plate 18, and the multistage switch is used.
By stepping on 26 to the fourth step and the fifth step, the left and right flap presser bodies 22 are sequentially lowered, and only the right flap presser body 22 presses and holds the flap cloth W3 in the case shown in FIG.

After the clamping work of the work cloths W1 to W3 is completed in this manner, the start switch 28 shown in FIG. 1 is turned on again. Since the start switch 28 at this point functions as an original sewing start switch, the clamp device 10 moves in the direction of arrow P, leaving only the binder 24, from the preparation position shown by the phantom line in FIG. At the same time, by the cooperation of the needle 8 of the sewing machine main body 2 and a thread catcher (not shown), two parallel seams are formed to form a body cloth W1, a hem cloth W2 and a flap cloth W3 as a work cloth. Are sewn respectively. It is well known that the body cloth W1 and the edging cloth W2 are cut by a cutter (not shown) between the two parallel seams at the same time as the edging.

<Effect of the Invention> The present invention presses two points on one side of the darts part of the work cloth along the direction intersecting the sewing direction with the darts holding plate, and pulls the work cloth toward the worker in this state. By doing so, the darts portion can be easily extended over a range determined by the width of the two points pressed by the darts holding plate, and it is possible to satisfactorily perform sewing such as a bead sewing to make a stitch across the darts portion, And the working time can be shortened.

Further, although the darts holding plate can be moved up and down separately from the lifting motion of the large pressing plate, it is normally retracted by the return spring to a position substantially flush with the large holding plate of the clamp arm. When setting the work cloth on the sewing machine table, it is possible to avoid troubles such as the work cloth being caught on the darts pressing plate, thereby shortening the working time for preparation for sewing.

[Brief description of drawings]

1 shows an embodiment embodying the present invention. FIG. 1 is an external perspective view showing a main part of a bead sewing machine, and FIG. 2 is an enlarged view of a clamped state of a work cloth by a clamp device and a binder. FIG. 3 is a partial cross-sectional view, FIG. 3 is an external perspective view partially showing an example of the work cloth, FIG. 4 is a plan view showing one clamp arm of the clamp device, and FIG. 5 is a front view of FIG. FIG. 6 is an external perspective view showing the disassembled construction of the darts pressing plate and its actuator. 4 …… Sewing machine table 10 …… Clamping device 12 …… Clamp arm 14 …… Large presser plate 16 …… Actuator for operating the large presser plate 30 …… Darts press plate 38 …… Actuator for operating the darts press plate W1 to W3 …… Work cloth W1a …… Darts part

Front page continuation (72) Inventor Yasuhiko Watanabe 9-35 Hotta-dori, Mizuho-ku, Aichi Prefecture Brother Industries, Ltd. (72) Hideo Kawaguchi 9-35 Hotta-dori, Mizuho-ku, Aichi Prefecture Brother Industry Co., Ltd. In-house (56) References: Actual Development Sho 61-21467 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A pair of clamp arms are rotated by respective actuators so that large presser plates respectively provided on the clamp arms are moved up and down with respect to a sewing machine table, and predetermined machining is performed. A sewing machine clamping device capable of pressing both sides of a sewing part onto a sewing machine table by the above-mentioned large presser plates when forming a stitch across a darts portion formed on cloth. A pair of darts pressing plates that are attached to the arms so that they can be moved up and down, and that can press two points on one side of the darts part of the work cloth and along the direction intersecting the sewing direction, and these darts pressing plates. The actuator for the darts presser plate which raises and lowers the plate separately from the raising and lowering operations of the two large presser plates, and the both clamp arm side and the both darts. Respectively provided between the holding plate, perforated clamping device provided with a return spring which is both these darts pressing plate constantly held in substantially the same plane position as the both clamp foot plate.