JPH08224386A - Beading hole forming device of sewing machine - Google Patents

Abstract

PURPOSE: To form V-cuts of different sorts using a low-cost and simple configuration. CONSTITUTION: The beading hole forming device is provided with a sewing machine M to sew together a base cloth and a bead cloth, a cut-open means 31 to cut open the base cloth parallel with the stitch, and a V-cutting means to form a V-cut at each end of the cut-open part formed by the means 31. The V-cutting means is composed of the first and second corner knives 41a, 41b, 42a, 42b and driving means 51a, 51b, 52a, 52b which elevate the lower the corner knives independently. Further, the configuration includes a selecting means to select the first and second corner knives one each and a control means 70 to control a cloth transport means, the driving means, and the corner knives are arranged so that the corner of each cutting edge part lies on the extension line from the cut-open part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bead hole forming device for forming bead holes in bead cloth and body cloth sewn by a sewing machine.

[0002]

As is well known, when forming a bead, it is necessary to form a bead hole in the body cloth after sewing the body cloth and the bead cloth. As shown in FIG. 10, the bead hole has a linear incision portion (straight incision portion) Ca formed in parallel with the seam lines S1 and S2 that sew the body cloth W1 and the bead cloth W2,
It is composed of V-shaped incisions (V-incisions) Cb1 and Cb2 formed at both ends of the linear incision Ca. And such a bead hole is disclosed in, for example, Japanese Patent Laid-Open No. 58-9998.
It was formed by a bead hole forming device as shown in Japanese Patent Publication No.

FIG. 7 is a view showing this conventional bead hole forming device. The device shown here is provided on a two-needle sewing machine M that stitches a woven cloth W2 and a body cloth W1, and has a center knife 1 forming a linear cut portion Ca and the V-shaped cut portion Cb.
1, and a corner knife mechanism 2 forming Cb2. Of these, the center knife 1 is held between the two needle bars N1 and N2 held by the sewing machine arm ma, and protrudes onto the work W such as the body cloth W1 and the ball cloth W2 which is carried by the cloth carrying mechanism mc during sewing. And then work W
Is moved to form a linear incision Ca between the stitches S1 and S2. In addition, the cloth transport mechanism m
c is a cloth pressing member mc that horizontally moves while pressing the body cloth W1 and the ball cloth W2 placed on the sewing machine bed mb from above.
1 and a ball screw shaft m that is screwed to the cloth pressing member mc1.
c2 and a motor m for rotating the ball screw shaft mc2
It consists of c3.

On the other hand, the corner knife mechanism 2 comprises a first corner knife mechanism 3 and a second corner knife mechanism 4. The second corner knife mechanism 4 includes a first rotating body 7 that rotates about a central axis 6 supported by a supporting body 5,
Plural kinds (three kinds) of the first parts provided in the first rotating body 7
Corner knives 8, 9 and 10, a motor 11 and gears 12 and 13 for rotating the first rotating body 7, and a plurality of types of first
Sewing machine bed mb from among the corner knives 8, 9 and 10
Of the air cylinder 14 and the like facing the opening portion mb1 of the sewing machine bed mb.

The first corner knife mechanism 3 has a movable body 15 which is horizontally movable along the guide shaft 23.
A second rotary body 17 rotatably supported by a central shaft 16 held by the moving body 15; and a plurality of types of second corner knife 18, which are provided on the second rotary body 17 so as to be vertically movable,
19, 20, a gear 21 provided so as to be capable of meshing with the gear 13, and a plurality of types of second corner scalpels 18, 19,
The air cylinder 22 and the like for retracting the one facing the opening mb1 among the 20 from the upper surface of the sewing machine bed.

Further, the guide shaft 23 is provided with a cloth pressing member mc.
It is adapted to be locked and released by the clamp member 24 provided on the No. 1 and moves with the cloth pressing member mc1 at the time of locking.

In the apparatus thus constructed, when performing the bead forming operation, first, the motor 11 is rotated to rotate the corner knife (for example, 8, 2).
0) is selected from both rotating bodies 7 and 17. At this time,
When the motor 11 is rotated, both the rotating bodies 7 and 17 rotate together through the gears 13 and 21 meshing with each other as shown in FIGS. 7 and 9, and the corner knives 8 and 20 of the preset combination are rotated. It is located in the opening mb1 formed in the sewing machine bed mb. After that, the motor mc3 is driven to rotate the ball screw shaft mc2, and the moving body 15 is moved along the ball screw shaft mc2 as shown in FIG. 8 to form a space between the corner knife 20 and 8. The width is made to match the width of the straight line cut portion Ca (see FIG. 10).

Next, when the sewing operation is started, as shown in FIG. 10, the center knife 1 projects between the two seams S1 and S2 that sew the ball cloth W1 and the body cloth W2, A linear incision portion Ca is formed. During this time, the cloth pressing member mc1
When the position reaches the position shown in (b), the clamp member 24 grips the guide rod 23 and moves the guide rod 23 together, and the moving body 15 is moved by the locking portion 23a. And
When the cloth pressing member mc1 is moved to the position shown in (c), the corners of both corner knives 8 and 20 are located directly below both ends of the linear opening, and the knives project here so that both ends of the linear opening Ca are located. As shown in FIG. 10, there is a V-shaped incision Cb.
1, Cb2 are formed.

When the shapes of the V-shaped incisions Cb1 and Cb2 are changed to other shapes, the motor 11 is rotated in the initial state, and the rotating bodies 7 and 17 are rotated so that different corner scalpels are moved relative to each other. Just set it to the opposite position.

As described above, in the conventional device, the first,
A plurality of corner knives are held in each of the second corner knives mechanisms 3 and 4, and the incision Cb formed by both corner knives is the same as the number of the corner knives.
1, Cb2 can be formed.
That is, each of the illustrated corner knife mechanisms 3 and 4 is provided with three types of corner knives, so that the V-shaped incision portion can be formed by a combination of three types.

[0011]

However, in the above-mentioned conventional apparatus, the first and second corner knife mechanisms 3 and 4 include the rotors 7 and 17, and the motor 11 and the gears for rotating them. It is necessary to provide 12, 13, 21 and the like, and in addition, in the second rotating body 7, 17, various mechanisms and parts such as the clamp member 24 and the guide rod 22 for moving the moving body 15 are provided. However, there is a problem in that the configuration is complicated and expensive.

In addition, in order to set the corner knife to an appropriate position, there is also a problem that control of the motor 11 and precision of each component are required to be high.

Further, in the conventional device, both rotary bodies 7, 1
The V-shaped incision can be formed only by a preset combination of the corner scalpels provided in No. 7, and it is extremely difficult to form the bead hole by another combination, so that there is a problem of lacking versatility. there were. For example, the corner knife 8, 9, 1 held by the first and second rotating bodies 7, 17
Of the 0, 18, 19, and 20, by combining the corner scalpels 8 and 20, it is possible to form a bead as shown in FIG. 10A. In order to form such a bead, Is a complicated operation such as removing the gear 21 to change the meshing position between the gears 21 and 12, or rotating only the first rotating body 7 when the gears 12 and 21 are not meshed. Was needed.

The present invention has been made by paying attention to the problems of the above-mentioned prior art, and relates to a bead hole forming device of a sewing machine capable of forming a plurality of types of V-shaped incisions with an inexpensive and simple structure. For the purpose of provision.

[0015]

SUMMARY OF THE INVENTION According to the present invention, a sewing machine which stitches a body cloth and a ball cloth by a seam by cooperation of a sewing needle and a cloth conveying means, and an incision of the body cloth in parallel with the seam. A bead forming hole forming device for a sewing machine, comprising: a cutting means; and a V-shaped cutting means for forming a V-shaped cutting portion at both ends of the cutting portion cut by the cutting means. Plural kinds of first and second forming V-shaped incisions at both ends
V-cutting means including a corner knife and a driving means for independently raising and lowering each corner knife, cloth conveying means for the sewing machine, and one corner knife required from both V-cutting means. A V-shaped blade comprising selection means for selecting, control means for controlling the driving means, the cloth conveying means and the selection means, wherein the first corner knife and the second corner knife bend in opposite directions. In addition to having the parts, the blades are arranged so that the corners of each blade are located on the extension line of the incision formed by the incision means.

[0016]

In the present invention, the body material having the incision portion formed by the incision means is conveyed in the stitch forming direction by the cloth conveying means, and one end portion of the incision portion is preliminarily set in the first corner knife. When it reaches above the selected corner knife, first, the first corner knife moves up and down to form a V-shaped incision in the cloth. After that, when the other end of the incision formed by the incision means reaches above the corner knife selected from the second corner knife, the driving means of the corner knife operates and the corner knife moves up and down. , V-shaped incision is formed. As a result, V-shaped incisions having a desired shape are formed at both ends of the incision formed by the incision means.

[0017]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 6 and 10. 1 to 5 and 10
FIG. 3 is a diagram showing an embodiment of the present invention. In the figure, M
Is a two-needle sewing machine. This sewing machine has two sewing needles N
1, N2 and the body material W placed on the sewing machine bed MB
1 and the cloth cloth W2, and a cloth conveying mechanism MC for moving the cloth cloth W2 in synchronization with the sewing needles N1 and N2. Further, the sewing machine arm MA is provided with a center knife 31 located between the sewing needles N1 and N2. This center knife 31 is a work W (body cloth W) placed on the sewing machine bed.
1, a beaded cloth W2) which penetrates the cloth and forms a linear incision in the cloth conveyed by the cloth conveying mechanism MC. The center knife 31 is held by the knife driving cylinder 32 in the raised position when not driven and in the lowered position when driven.

The cloth conveying means MC includes a pulley 3
The endless belt 35 laid on 3, 34, a moving motor 36 for moving the endless belt 35 in both forward and reverse directions, and a cloth holding member 38 provided at the tip of an arm 37 connected to the endless belt 35. Become. This cloth holding member 38
Is capable of moving while holding both the body cloth W1 and the ball cloth W2 placed on the sewing machine bed MB.
The cloth conveying mechanism MC and the center knife 31 form a linear cutting means.

On the other hand, 41a and 41b are first corner knives, and 42a and 42b are second corner knives, which are as shown in FIGS. 2 (a), (b), (c) and (d). In the sewing machine bed MB, the V-shapes are different from each other, and the corners are located on the extension line L of the incision formed in the body cloth W1 by the center knife 31. It is located below the opening MB1. Further, the corner scalpels 41a and 41b, 42a and 42b are bent in the same direction, and 41a and 42a are bent in opposite directions. And here 41a
And 42a and 41b and 42b are line-symmetrical to each other.

Each of the corner knives is held by an air cylinder 51a, 51b, 52a, 52b as a driving means, and in each case, the opening MB1 of the sewing machine bed MB is caused by the retracting operation of the cylinder rod of the air cylinder.
It is supposed to appear from. Further, 70 is a control device (control means and selection means) for controlling the operation of each of the above-mentioned parts.
Is. The control device 70 includes a well-known microcomputer and an input unit for inputting various data and commands, and each driving circuit 61a, 61b, 62a, 6 of the air cylinders 51a to 52b and the knife driving cylinder 32.
2b and 32a are controlled, and the movement motor 36 is controlled.

In this embodiment configured as described above, the data d1 to d7 representing the distance as shown in FIG. 3 are previously input to the storage section of the control device 70. Here, d1 is the distance from the end of the cloth set at the cloth setting position (initial position) to the sewing needles N1 and N2, d2 is the distance from the sewing needle N1 (N2) to the corner knife 41a, and d3 is the distance. The distance from the sewing needle N1 to the corner knife 41b, the distance d4 from the corner knife 41a to the corner knife 42b, the distance d5 from the corner knife 41a to the corner knife 42a, and the distance d6 from the corner knife 4a.
The distance from 1b to 42a, d7 is the corner knife 41
The distance between b and 42b is shown.

When forming the bead, the operator first inputs the lengths of the seams S1 and S2 of the bead to be formed (step 1), and then the two corners to be used next. A knife is selected from the corner knife (step 2). The combinations of corner knives that can be selected in this embodiment are 41a and 42a, 41a and 42a.
There are four ways, b, 41b and 42a, 41b and 42b,
Any one of them is selected and input by an input device (not shown).

Here, when a sewing operation start command is input,
The control means performs the bead forming operation in the following procedure. That is, when the sewing operation start command is input, the control device 70 drives the movement motor 36 of the cloth transport mechanism MC to set the body cloth W1 and the cloth cloth W2 set to the initial position.
The work W consisting of is moved in the X1 direction (step 3). Then, when the moving distance reaches a preset d1, the scheduled sewing position of the work W is located below the sewing needles N1 and N2. Here, the controller 70 controls the sewing needles N1, N
The seam forming operation by 2 and the like is performed in synchronization with the cloth conveying operation, and the body cloth W1 and the ball cloth W2 are sewn by two parallel seams (step 4).

When the sewing operation is performed for the predetermined number of stitches,
The front end portion of the planned formation portion of the linear incision portion Ca to be formed in the work W reaches below the center knife 31. Then, the control device 70 operates the knife driving cylinder 32 via the drive circuit 32a to lower the center knife. As a result, the center knife 31 penetrates the work W, and then the work W is moved in accordance with the sewing operation to form a linear incision Ca between the two seams. Then, when the length of the formed linear incision Ca reaches a preset length, the control device 70 controls the cylinder 32 to retract the corner knife upward to form the linear incision Ca. Complete (step 5).

When the sewing operation for the preset distance d0 is performed, the control device 70 stops the ascending / descending operation of the sewing needles N1 and N2 and ends the sewing operation (step 6). However, the cloth transport mechanism MC continues to carry the work W, and the movement amount of the work W is equal to the preset distance d2 or d.
When the number reaches 3, the corner knife 41a or 41b is moved up and down to penetrate the body cloth W1 and the ball cloth W2 to form a V-shaped incision Cb1 at the rear end of the linear incision (step 8). The corner knife that rises at this time is the corner knife selected in advance by the operator.

After that, the control device 70 carries out the work transfer operation according to the combination of the corner knives selected in advance. For example, when the corner scalpels 41a and 42a are selected, the conveying operation for (d5-d0) is performed, and when the corner scalpels 41a and 42b are selected (d4
-D0) transport operation is performed, and when 41b and 42a are selected, (d6-d0) transport operation is performed, and when 41b and 42b are selected, (d7)
The carrying operation for -d0) is performed (step 9). In this case, when any one of d5 to d7 is smaller than d0, the carry amount by the cloth carrying mechanism has a negative value, but in this case, the cloth is not fed in the forward direction X1 but in the backward direction (X2 Direction).

By moving the work piece in this manner, the front end of the linear incision portion of the work piece is located above the corner knife, where the control device 70 causes the air cylinder 52 to move.
a or 52b is moved up and down to make a V-shaped incision c on the work W1.
b2 is formed. As described above, according to this embodiment,
By selecting the knife to be used,
It is possible to form four types of bead holes as shown in (a), (b), (c) and (d).

In the above embodiment, four corner knives are used to form four types of bead holes, but it is also possible to use four or more corner knives. The number of can be set and changed to any number. Therefore, as shown in FIG. 6, the number of corner knives used for the second cutting means differs from the number (n) of corner knives used for the first cutting knife mechanism (m).
It can also be a book).

Further, in the above-mentioned embodiment, the description has been made by taking the bead hole forming device for forming the V-shaped incisions at both ends of the linear incision as an example, but in the present invention, the incision formed in the curved shape by the center knife or the like. It is also applicable to a bead hole forming device that forms V-shaped incisions at both ends of the portion. In this case, the first and second corner knives forming the V-shaped incision are arranged such that the corners of the respective corner knives are located on the extension lines of the curved V-shaped incision.

[0030]

As described above, in the bead hole forming device for a sewing machine according to the present invention, a plurality of types of first and second corner knives are arranged on the extension line of the incision formed by the incision means. After the incision portion is formed by the incision means, both ends of the incision portion are sequentially moved to positions facing the corner knife to form the V-shaped incision portion. Therefore, the position of the corner knife is moved conventionally. The mechanism can be greatly simplified as compared with the above device, and the cost can be significantly reduced. Further, since it is possible to use a plurality of types of first corner knife and a plurality of types of second corner knife in any combination, it is possible to determine the type of bead that can be formed without increasing the number of corner knife provided. Can be increased.

[Brief description of drawings]

FIG. 1 is a side view showing a schematic configuration of an embodiment according to the present invention.

FIG. 2 is a plan view showing a bent state of a corner knife in the embodiment.

FIG. 3 is an explanatory side view showing distance data preliminarily input to the control means in the above embodiment.

FIG. 4 is a diagram showing the types of bead holes that can be formed in the above-mentioned embodiment, (a) shows a case where corner knives 41a and 42b are used, (b) shows a case where 41b and 42a are used, (C) shows the case where 41a and 42a are used,
(D) shows the case where 41b and 42b are used, respectively.

FIG. 5 is a flowchart showing a bead forming operation procedure in the embodiment.

FIG. 6 is an explanatory side view showing another embodiment of the present invention.

FIG. 7 is a side view showing a bead hole forming device of a conventional sewing machine.

8 is a side view showing an operating state of the one shown in FIG. 7. FIG.

9 is a plan view showing a peripheral configuration of the corner knife shown in FIG. 7. FIG.

FIG. 10 is a plan view showing a formation state of a bead hole,
(A) shows a bead hole formed using the corner knives 8 and 20, and (b) shows a bead hole formed using 10 and 19, respectively.

[Explanation of symbols]

 M 2-needle sewing machine 31 Center knife 41a, 41b 1st corner knife 42a, 42b 2nd corner knife 70 Control device MC Cloth transport mechanism W1 Body cloth W2 Ball cloth

Claims (1)

[Claims] 1. A sewing machine which conveys a body cloth and a pile cloth superposed on the body cloth in synchronism with the raising and lowering movement of a sewing needle by a cloth conveying means, and sews the body cloth and the ball cloth by seams, which should be formed. Incision means for forming an incision portion having the same width as the opening width of the pocket in the body cloth in parallel with the seam, and V for forming V-shaped incision portions at both ends of the incision portion incised by the incision means. In a bead hole forming device of a sewing machine including a character cutting means, a first corner knife and a first corner knife having at least one knife forming a V-shaped cut part at one end and the other end of the cut part. V-shaped cutting means having two corner knives and driving means for moving up and down each corner knife independently, cloth conveying means of the sewing machine, the driving means and cloth conveying means, first corner knife and second
And a control means for controlling selection means for selecting one corner knife and one selection means, and the first corner knife and the second corner knife have V-shaped blade portions that bend in opposite directions. The corners of the blades are arranged so as to be located on the extension lines of the incision formed by the incision means, and the control means conveys the body cloth and the woven cloth having the incisions formed by the cloth conveying means. Then, when one end of the incision portion reaches above a predetermined corner knife selected from the first corner knife, the first corner knife selected by the selecting means is moved up and down, and The second corner knife selected by the selecting means is moved up and down when the other end reaches above a predetermined corner knife selected from the second corner knife. Emissions of beaded hole forming apparatus.