JP2512587Y2 - Bead forming device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides edge trimming by sewn a ball cloth to a pocket opening portion of a body cloth, and also a flap cloth covering the pocket opening portion in the sewing operation. The present invention relates to a bead forming device which can be simultaneously performed.

[0002]

2. Description of the Related Art At present, a device shown in FIG. 5 is known as a device for performing trimming sewing called a bead on the opening of a pocket or the like. In the figure, on the cloth placing table T,
A pair of body material pressers 1 and 2 facing each other at a predetermined interval are provided, and each body material presser 1 and 2 can be moved up and down on the cloth placing table 1 by a driving means (not shown). ing. Further, folding plates 1a and 2a are provided inwardly of the body pressers 1 and 2 so as to be retractable.

A well-known two-needle sewing machine M that simultaneously forms two stitches is located on the cloth placing table T. From the needle drop position of this sewing machine M, the cloth conveying direction (Y direction). In front of this, there is provided a cloth presser foot 3 which is moved up and down by a driving means not shown. This pad cloth retainer 3 includes a rising portion 3a connected to a driving means (not shown) and a flat plate portion 3 provided at the lower end thereof.
It forms an inverted T-shape in cross section with b, and when descending, descends between the pair of body material pressers 1 and 2 that have been moved to the cloth setting position (position indicated by the alternate long and short dash line in FIG. 5). .

Therefore, after pressing the body cloth W1 by the body cloth pressers 1 and 2, the cloth W2 is placed on the body cloth pressers 1 and 2, and the cloth presser foot 3 is lowered to the center of the cloth cloth W. The portion is pushed between the body material pressers 1 and 2 by the flat plate portion 3b and is in a state of being overlapped with the body material W1. If the folding plates 1a and 2a are further projected inward from this state, the body material W1 is It is bent along the shape of the ball presser foot 3 and stands up (see FIG. 6).

Next, a flap cloth W3 for covering the opening of the pocket is set on the ball cloth W2. This setting operation is performed by placing the flap cloth W3 on one folding plate 1a, and then lowering the cloth fixing member 4 provided on the one body material presser 1 so as to be able to move up and down by a cylinder (not shown) or the like. This can be performed by sandwiching and fixing the flap cloth between 1a and the cloth fixing member 4, and the setting operation of the cloth is completed by the above.

After that, by moving the body cloth pressers 1 and 2 in the arrow Y direction, the body cloth W1, the ball cloth W2 and the flap cloth W3 move in the same direction, and the flap cloth W3. When the tip of the sewing machine reaches the needle drop position, the sewing needles N1 and N2 simultaneously start moving up and down, and the body material W1, the bead W2 and the flap cloth W3 are sewn by one sewing needle N1 and the other sewing needle. The body cloth W1 and the ball cloth W2 are sewn together by N2. The sewing operation ends when it reaches the end portion of the flap cloth W3. However, the body cloth and the cloth W2 that have passed the needle drop position during this time are sewn by the center knife 5 protruding from the cloth placing table T by two stitches. The central part of the line of sight is incised, and both ends of the incised part are incised in a V shape by the corner knife 6, whereby the formation of the bead is completed.

[0007] It is necessary to further sew a sack cloth constituting the bag portion of the pocket to the body cloth having the bead thus formed. As shown in FIG. 7, this sewing operation is performed by overlapping the flap cloth W3 on the pocket cloth W4 and forming stitches along substantially the same line as the seam line S formed on the flap cloth W4 when forming the bead. To do. Therefore, this work is usually performed by a process other than the bead forming process.

For this reason, a large number of personnel, facilities and spaces are required for the work, and in terms of quality, double stitches are formed at the same location, which causes a problem that the appearance of the sewn portion is impaired. . Therefore, at present, in the bead forming step, a bag cloth W4 is further laid on the flap cloth W3, these are fixed by the cloth fixing member 4, and the bag cloth W4 is also sewn at the same time in the bead sewing forming step. Has been done.

[0009]

However, in the conventional device, the edge portion of the flap cloth is detected by using the light sensor which irradiates the folding plate with light and receives the reflected light. When the bag cloth W3 is superposed on the flap cloth W3 as described above, the flap cloth W2 is completely covered with the bag cloth W4 as shown in FIG.
There is a problem that the end portion of the flap cloth W2 cannot be detected and the sewing operation cannot be automatically started.

Therefore, when the bag cloth W4 is simultaneously sewn, the bag cloth W4 is turned over each time manually or by using a special mechanism, and the operator performs the sewing operation while checking the end position of the flap cloth. However, this imposes a heavy burden on the operator, and the quality of the sewn product is likely to vary, so that the significance of installing this kind of device for automation and labor saving is lost.

Since the present invention has been made in view of the above problems, it is possible to surely detect the edge of the flap cloth even when the bag cloth is placed on the flap cloth. An object of the present invention is to provide a bead forming device that can automate simultaneous sewing of bead cloth, flap cloth and bag cloth.

[0012]

SUMMARY OF THE INVENTION This invention is a ball cloth which has a cross-section inverted T when the cloth placed on a cloth table is pressed by a pair of cloth pressers and lowered between the cloth pressers. Hold down the center of the cloth along the presser foot, bend both sides of the cloth by a pair of folding plates, place and fix the flap cloth and bag cloth on at least one folding board, and then press the body cloth. While moving each cloth together with the body material by moving the needle toward the needle drop position, the cloth guide and the cloth presser provided near the needle drop position are introduced and pinched, and The raising / lowering position of the cloth guide is detected by a detecting means.

[0013]

In this invention, when each cloth is moved toward the needle drop position together with the body cloth, the ball cloth, the bag cloth and the flap cloth are sequentially inserted between the cloth guide and the ball cloth retainer. The cloth guide is sequentially pushed upward according to the number of cloths to be inserted. Therefore, the position of the cloth guide changes depending on whether the ball cloth and the bag cloth are inserted or when the flap cloth is inserted in addition to these cloths. Also changes. Therefore, it becomes possible to detect whether or not the end position of the flap cloth has reached the vicinity of the needle drop position by the output value of this detecting means, and if the detection signal is used for starting and ending the sewing operation, The action can be done automatically.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
It will be explained based on. It should be noted that the same or corresponding parts as those of the above-mentioned conventional technique are designated by the same reference numerals, and detailed description thereof will be omitted.
The bead forming device according to this embodiment has sewing needles N1 and N2.
In addition to the sewing machine having the sewing machine, the body material pressers 1 and 2, the cloth presser foot 3, the cloth fixing member 4 and the like are provided in the same manner as in the conventional case. Has become.

On the other hand, a fulcrum shaft 10 is rotatably supported on the upper portion of the pad cloth retainer 3 in this embodiment, and the fulcrum shaft 10 prevents the rising portion of the cloth cloth W1 from falling. The cloth guide 11 is fixed. Further, a leaf spring (spring body) 12 as an elastic member fixed to the rising portion of the ball cloth presser 3 is in pressure contact with the cloth guide 11.
Due to the biasing force of the leaf spring 12, the thin-walled plate-shaped guide portion 11a formed at the lower end portion is always in pressure contact with the upper surface of the pad cloth retainer.

The lower surface of the guide portion 11a is inclined upward from the front to the rear in the cloth conveying direction, and its tip end rises with the needle drop groove 3b1 formed at the tip of the flat plate portion 3b of the pad cloth holder 3. It is designed to descend between itself and the portion 3a. Although not particularly shown here, a cloth guide having the same structure as the cloth guide 11 is provided symmetrically with the cloth guide 11 with the rising portion 3b of the ball cloth presser 3 interposed therebetween.

Reference numeral 13 is a potentiometer as a detecting means for detecting the rotation angle of the fulcrum shaft 10. The potentiometer 13 has its electric resistance changed by the rotation of the fulcrum shaft 10 and its inter-terminal voltage (output signal value) changed. Here, the output signal value from the potentiometer increases as the fulcrum shaft rotates in the direction a in the figure, and conversely decreases in value when it rotates in the direction b. Further, this output signal is input to a control means (not shown) such as a CPU via a predetermined input device, and the control means controls the start and end of the sewing operation of the sewing machine main body based on this output signal. It has become.

Next, the operation will be described based on the above configuration.
In the sewing operation, first, the body cloth W1, the ball cloth W2, the flap cloth W3, and the bag cloth W3 are sequentially set at the cloth setting position as in the conventional case. As a result, the flap cloth W3 becomes covered with the bag cloth W4 as shown in FIG. Also, when each cloth is in the cloth setting position (position shown in FIG. 1),
The guide portion 11a of the cloth guide 11 is the flat plate portion 3 of the ball cloth presser foot 3.
It is pressed against b, and the output signal from the potentiometer 13 has a predetermined initial value.

Here, the body material pressers 1 and 2 are moved forward (Y direction), and together with the body material W1, the respective cloths W2, W3, W.
When 4 reaches the vicinity of the needle drop position P, first, the bead cloth W2 located on the upper surface of the bead presser foot 3 has the cloth guide 11 and the bead foot presser 3
And the cloth guide 11 is pushed up by the cloth thickness (see FIG. 4A), and the fulcrum shaft 10 rotates in the direction a by a predetermined angle. As a result, the output signal value of the potentiometer 13 changes to a value (first output value) larger than the initial value.

After that, when the body material pressers 1 and 2 are further advanced, the front end portion of the bag cloth W4 covering the flap cloth W3 enters between the cloth guide 11 and the ball cloth presser 3, and the cloth guide 1
1 is pushed upward by the thickness of the bag cloth W4 (Fig. 4
(B)). As a result, the fulcrum shaft 10 further rotates in the a direction, and the output signal value from the potentiometer is larger than the first output value (second output value) with the rotation.
Changes to

Here, the cloth further advances, and the cloth guide 11
When the front end portion of the bag cloth W4 between the cloth cloth presser foot 3 and the pad cloth presser 3 reaches the vicinity of the needle drop position, the cloth cloth W2, the flap cloth W3, and the bag cloth W4 are provided between the cloth guide 11 and the pad cloth presser foot 3. The three cloths are inserted, and the cloth guide 11 is in the most pushed up state at this point (see FIG. 4C). Therefore, the fulcrum shaft 10 also takes the maximum rotation angle in the a direction, and the output signal value from the potentiometer also changes from the second output value to the third output value larger than this.

Then, when the second output signal value changes to the third output signal value, the control means immediately starts the sewing operation. As a result, a seam is formed from the end position of the flap cloth W3.

After that, when the rear end of the flap cloth W3 passes through the cloth guide 11, the cloth guide 11 presses the two cloths of the flap cloth W3 and the bead cloth W2, and the flap from the previous highest position is reached. The cloth W3 is lowered by the cloth pressure (FIG. 4).
(D)). Therefore, the fulcrum shaft 10 rotates in the direction of arrow b, and the output value of the potentiometer 13 decreases from the third output value to the second output value. In response to this change, the CPU
Immediately stops the sewing operation, and the end portion of the stitch coincides with the rear end portion of the flap cloth W3. Although not particularly shown here, the body cloth W1 and the ball cloth W2 are incised by the center knife and the corner knife in the same manner as in the conventional case.

As described above, in this embodiment, the pad cloth holder 3
Since the thickness of the cloth inserted between the cloth cloth 11 and the cloth guide 11 is detected, even when the flap cloth W3 is covered with the bag cloth W4, the front end portion and the rear end portion of the flap cloth W3 can be reliably held. The position can be detected, and the stitch can be automatically formed in an appropriate range by using the detection result.

Here, the case where the sewing operation is performed in the state where the bag cloth is overlapped on the flap cloth W3 has been described as an example, but only the body cloth W1, the ball cloth W2 and the flap cloth W3 are sewn, This embodiment can be applied to the case where the bag cloth is sewn in a separate process. That is, in this case, the cloth guide 1
The output value when the blanket W2 and the bag cloth W2 are inserted below 1 is used as a sewing start signal, and the sewing operation is terminated when the output value changes to the output value when one cloth is inserted. Just do it.

Further, in the above embodiment, since it is assumed that the flap cloth W3 and the bag cloth W4 are placed on one folding plate 1a, the potentiometer 11 is provided only on one cloth guide 10, but the other cloth guide 10 is provided. Also, the potentiometer 13 may be provided. Further, the detecting means according to the present invention is not limited to one whose electric resistance changes, and other detecting means such as a magnetic detecting means or an optical detecting means can be used.

Further, in the above-mentioned embodiment, the so-called double ball formation in which the bead is formed at both opening edges of the pocket opening has been described as an example, but in the so-called double ball formation in which the bead is formed only at one opening edge. The present invention is also applicable, and the present invention is not particularly limited to the above embodiment.

[0028]

As described above, in the bead forming device according to the present invention, the cloth reaching the vicinity of the needle drop position is introduced and nipped between the cloth presser and the cloth guide, and the cloth guide is moved up and down. Since the cloth thickness at the needle drop position is detected by detecting, whether the front end and the rear end of the flap cloth have reached the needle drop position even when the flap cloth is covered with a bag cloth. Whether or not it can be accurately detected. Therefore, the stitch can be formed reliably and automatically without losing the sewing range from the front end portion to the rear end portion of the flap cloth, and the burden on the operator is reduced and the productivity is improved. be able to.

[Brief description of drawings]

FIG. 1 is a perspective view showing a cloth set state in an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which the cloth is moved toward the needle drop position from the state shown in FIG. 1 in the embodiment.

FIG. 3 is an enlarged side view of an essential part of what is shown in FIG.

FIG. 4 is a side view showing an operation state of the one shown in FIG. 3, (a) showing a state in which a pad is introduced between a pad presser and a cloth guide, and (b) is a pad press. Shows a state where a ball cloth is introduced between the cloth guide and the cloth guide, and (c) shows a state where a ball cloth and a bag cloth are introduced between the cloth presser foot and the cloth guide,
(D) shows a state in which a ball cloth, a bag cloth, and a flap cloth are introduced between the ball cloth presser and the cloth guide.

FIG. 5 is a perspective view showing a schematic configuration of a conventional bead forming device.

FIG. 6 is a perspective view showing a cloth set state of the one shown in FIG.

FIG. 7 is a perspective view showing a state in which a bag cloth is set on the cloth after the bead forming step is completed.

[Explanation of symbols]

 T cloth mounting table 1, body cloth presser 1a, 2a folding plate 3 ball cloth presser 4 cloth fixing member 10 fulcrum shaft 11 cloth guide 12 leaf spring (elastic member) 13 potentiometer W1 body cloth W2 jade cloth W3 flap cloth W4 bag cloth

Claims (2)

(57) [Scope of utility model registration request] 1. A pair of opposing members that press and hold a body material placed on a cloth placing table at a predetermined interval and move the body material from a cloth setting position to a needle drop position. The body material presser and the fabric placing table are provided so as to be able to move up and down, and when descending, they are lowered between the pair of body material retainers to press the central portion of the bedding placed on both body material retainers. A cross-section of T-shaped cross-section presser and a pair of fold-outs that are provided so as to be able to appear in and retract from each of the above-mentioned fabric pressers and bend both sides of the cross-section inward along both sides of the above-mentioned press-down fabric when protruding. A folding plate, a cloth holder for fixing a flap cloth and a bag cloth on the folding plate, and a fold support which is supported by the pad presser so as to be able to move up and down and always near a needle drop position of the pad press by a predetermined elastic member. A fabric guide held by the And cloths are moved toward the needle drop position so that the cloth cloth, the flap cloth and the bag cloth are introduced and pinched between the cloth guide and the cloth presser, and the cloth guide is moved up and down. A bead forming device, characterized in that a detection means for detecting is provided. 2. A dough guide is fixed at its one end to a fulcrum shaft rotatably provided on a cloth presser, and is always held at a lowermost position by a spring body, while the detecting means is rotated at a rotational position of the fulcrum shaft. A bead forming device comprising a potentiometer for detecting the.