JPS6314636B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bead hole forming device for a sewing machine for making a bead pocket, and in particular, a method for forming a bead hole for making a vertically sloping bead pocket for jackets, etc. It is related to.

Conventionally, in order to form a bead pocket, the first
As shown in Figure 1, bend it on both sides of the welt hole W ₀ , and use sewing machine N with two needles (Figure 1) to form two parallel stitches while sewing the ends between the two needles. The sewing machine automatically stops when a stitch L of a predetermined length is formed by cutting open the space between both seams using a center knife M placed in the center knife Both ends of the incision S ₀ are incised into V-shapes Y ₀ and Y ₁ using a corner scalpel.

However, the side pocket of the suit shown in Figure 10
When forming bead holes with vertically slanted shapes like P ₁ and P ₂ , both ends of the pocket K ₁ and K ₂ must always be aligned in the vertical direction due to clothing design. Therefore, the stitches at this time are two stitches Q and Q along the incision _S1 , as shown in Figure 12.
It must be formed so that the shape represented by and the line connecting both ends becomes a parallelogram. Therefore, when forming both parallelogram-shaped stitches along the cloth feeding direction as described above using a twin needle, for example, as shown in Japanese Patent Publication No. 55-33356, etc., In section D ₁ , first drive only one of the two needle bars (corresponding to the bottom stitch in Figure 12), then drive both needle bars in section D ₂ . Then, in the section _D3 , only the other needle bar (opposite to the stitch on the upper side of FIG. 12) is driven to obtain the desired stitch. Therefore, compared to the case of forming the normal pocket seam shown in Fig. 11, when forming the slanted pocket seam shown in Fig. 12, the fabric is fed an extra length by the length of the section _D3 ,
Moreover, the length of the cut of the center knife M also increases by Δx. That is, if the length of the incision of a normal pocket is l ₀ , the length of the incision of an inclined pocket is l ₁ , the width from the incision to one seam Q is h, and the inclination angle of the pocket is θ. , Δx=l ₁ −l ₀ =htanθ. From this, in order to accurately align the incision position of the corner knife with both ends of the incision _S1 in the inclined pocket, it is necessary to increase the distance between the corner knives by the above-mentioned htanθ.

However, in the past, the inclination angle θ of the pocket
Each time the distance between the corner knives is set, the distance between the corner knives must be manually corrected, which has the disadvantage that this adjustment work is extremely complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for forming a bead hole in which the adjustment operation described above is automatically performed in accordance with the setting of the inclination angle θ of the pocket.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a sewing machine having two needles N spaced apart in a direction perpendicular to the cloth feeding direction is mounted on a table 1, and although not shown, The needle bar of this sewing machine has, for example, the one shown in Japanese Patent Publication No. 55-33356.
Means for selectively stopping one of the two needle bars is provided.

A workpiece conveying device 2 disposed on a table 1 so as to be movable along the cloth feeding direction of the sewing machine engages a screw shaft 4 with a screw hole (not shown) formed in a support frame 2a that hangs below the table 1. and connect them together, and place the body fabric on the right end (Fig. 1) above table 1.
It supports the gripping body 3 that holds the welt cloth. Screw shaft 4
is the starting point of sewing, where the cloth is located on the front side in the cloth feeding direction (Fig. 6), and the sewing end point, which is located further ahead in the cloth feeding direction, by driving the stepping motor _STM 1. A certain first position (eighth
(Fig. 9) and a second position (Fig. 9) which is located further forward in the cloth feeding direction than the first position and where both edges should be cut with a corner knife. The center knife M cuts open the material to be sewn between the two stitches in conjunction with an operating mechanism (not shown) located below the bed in the middle between the two needles N to form an incision _S0 . It is possible to appear and appear above the table from below.

The support body 7 fixed below the table 1 has its tip placed on the table 1 further forward in the cloth feeding direction than the sewing section of the sewing machine.
A movable body 8 is supported by the machine frame so as to be movable in parallel in the cloth feeding direction ahead of the support body 7 in the cloth feeding direction so as to face downward.

A connecting rod 9 is loosely fitted into the connecting portion 8a projecting upward from the movable body 8 and the support frame 2a of the cloth conveying device 2, and is arranged parallel to the screw shaft 4 and slidable along the cloth feeding direction. To support. The right end (Fig. 1) of the connecting rod 9 is a free end to which a locking portion 9a is fixed, and the left end is fixed to a coiled spring 10 with one end fixed to the machine frame to apply a rightward acting force. Further, the locking means CP is operated by the action of the air cylinder AC ₁ fixed to the support frame 2a, so that the support frame 2a and the connecting rod 9 can be engaged with each other. The protruding portion 7a of the support body 7 supports a first rotating body 5 rotatably about a vertical axis, the movable body 8 supports a second rotating body 6 rotatably about a vertical line, The first and second rotating bodies 5 and 6 are provided with a gear 5a and a gear 6a that mesh with each other so as to rotate at a constant speed about their respective rotational axes, and the gear 5a is connected to a stepping motor STM fixed to a support 7. The gear 11 whose rotation is controlled by ₂ is in mesh.

Further, the first and second rotary bodies 5 and 6 have three support holes 5b (three sets) that penetrate vertically at a predetermined rotation angle so as to face each other in pairs on a line parallel to the cloth feeding direction. , 5c, 5d and 6b, 6c, 6d, and three types of corner knives with different opening angles of the V-shaped opening end corresponding to the inclination angle θ of the pocket are provided in each pair of both rotating bodies. A pair of corner knives are separately arranged with respect to the support hole so that when the pair of corner knives face each other on a line parallel to the cloth feeding direction, the opening ends of the V-shape face each other outward,
A pair of corner knives facing each other are pushed upward by the action of air cylinders AC ₂ and AC ₃ separately fixed to the supporting body 7 and moving body 8, respectively.

The air cylinder AC ₄ fixed to the machine frame fixes the plunger to the movable body 8 and uses bias to move the movable body 8 to a position where the gears 5a and 6a of the first and second rotary bodies 5 and 6 mesh, and then moves. When the locking portion 9a of the connecting rod 9 engages with the connecting portion 8a, the body 8 moves forward in the cloth feeding direction following the locking portion 9a.

Before the first rotating body 5 in the cloth feeding direction,
A substantially doglegged arm 18 whose intermediate portion is rotatably supported on the machine frame around a vertical axis has a first rotating body 5 at one end.
A roller 19 that is slidably in contact with the outer circumferential surface of the arm body 18 is supported rotatably about a vertical axis, and is disposed at the other end of the arm body 18 so as to be opposed to the movement path of the connecting rod 9. On the other hand, a stopper 18a is provided which restricts the backward movement of the connecting rod 9 in the cloth feeding direction by contacting with the locking portion 9a. It moves on the moving path of the connecting rod 9. Also, arm body 18
receives an acting force from the spring 23 that constantly presses the roller 19 against the outer circumferential surface of the first rotating body 5 . roller 1
9 comes into pressure contact. On the outer periphery of the first rotating body 5, adjusting bodies 20, 21, 22 having different thicknesses are arranged corresponding to each corner knife.
The adjustment bodies 21 and 22 are each fixed at a rotation angle at which the roller 19 engages when the rollers 6, 14, or 12 are positioned on the parallel line, and the adjustment bodies 21 and 22 have approximately the same thickness; For the thickness of
An extra stopper is applied via the roller 19 and the arm body 18 by Δx=htanθ (h: the width between the seam Q and the incision _S1 in FIG. 12, θ: the inclination angle of the bead edge in FIG. 12). The thickness is increased so that 18b is moved in the cloth feeding direction.

Next, the electric circuit of this invention will be explained.

In FIG. 5, OSW is an operation switch for starting and stopping the sewing machine. DS ₁ is a digital switch for setting the stitch length L (Figs. 11 and 12), DS ₂ is a digital switch for setting data corresponding to θ in Fig. 12, and MC
is a microcomputer, OSW, DS ₁ ,
Enter the information of DS ₂ and set each operating circuit DR ₁ ,
Stepping motor via DR ₂ , AD, MD
Drive and stop control of STM ₁ , STM ₂ , air cylinders AC _{1 to AC 4} , and motor M connected to the main shaft of the sewing machine. In particular, the set value of the digital switch DS ₁ corresponds to the control of the needle bar drive stop device (not shown) and the rotation control of the stepping motor STM ₂ , and is determined by the angle of inclination of the pocket (Fig. 12). 12
Corresponding to (Fig.), this is for making the corner knives that match the angle θ face each other at the operating position. Other control sequences are described in detail in, for example, the specification of Japanese Patent Application No. 53-69129 filed by the present applicant.
In the following, a method for setting the width between the opposing corner knives will be explained with reference to FIGS. 6 to 9.
Now, the engaging body 9a of the connecting rod 9 and the connecting part 8 of the movable body 8
Assume that the distance from a is a constant value x. Let us then form the bead of a seam of length L. The problem then becomes when to operate the air cylinder AC ₁ and cause the locking mechanism to lock the support frame 2a of the sewing material transport mechanism 2 and the connecting rod 9. For example, length α after sewing starts
Air cylinder AC ₁ only when the seam is formed
is turned on (Fig. 7), the distance between the engaging body 9a of the connecting rod 9 and the connecting part 8a of the movable body 8 is x-(L-α) when a stitch of length L is formed. (8th
figure). As can be seen from FIG. 8, the distance D by which the cloth must be conveyed from the sewing end position to the protruding position of the corner knife is constant regardless of the stitch length L. Furthermore, as can be seen from Fig. 11, the width t ₁ of the corner knife to be set (Fig. 9) is t ₁ =L-2d (d is the width of the corner knife as shown in Figs. 11 and 12). There is). From these facts, the distance that the movable body 8 is transported in the cloth feeding direction from FIG. ₈ to FIG. In order for the width between the knives to be appropriate for the stitch L, D-
(x−L+α)=t ₁ −t ₀ =L2d−t ₀ must be satisfied.

From now on, α=D+2d+t ₀ −x, that is, microcomputer MC (hereinafter referred to as microcomputer)
The values of d, t ₀ , D, and x are set as constants, and the operation timing α of the air cylinder AC regardless of the stitch length L is stored.

Conversely, if we transform the above equation, t ₁ = L-2d = D + L + α
+t ₀ -x, if α is set as a constant value by the microcomputer MC, then considering x as a variable, △x ₁ = -△x, that is, the position of the stopper 18a is moved by △x to the left (first
If you shift it to (Figure), the distance between the set corner knives will increase by Δx.

In one embodiment of the present invention, the above principle is used.

Next, the operation of the present invention will be explained.

First, as shown in FIG. 11, let us consider the case where a bead hole is formed using a corner knife at both ends of the incision _S0 so that the opening edges are approximately perpendicular to the longitudinal direction of the incision _S0 . explain. As shown in FIG. 1, with the gear 5a of the first rotating body 5 and the gear 6a of the second rotating body 6 meshing, the stitch length L is set to the digital switch DS ₂ , and the digital switch DS is By setting "0" to ₁ , the stepping motor STM ₂ rotates so that the corner knife 16 of the first rotating body 5 and the corner knife 17 of the second rotating body 6 face each other in the operating position. Then, the adjusting body 20 fixed to the outer periphery of the first rotating body 5 comes into contact with the roller 19. Then, the knob 18b of the arm body 18 is rotated so that the distance between the engaging body 9a of the connecting rod 9 and the connecting portion 8a of the movable body 8 becomes a predetermined value x (FIG. 6).

After the selection and positioning of the corner knives 16 and 17 are completed in this way, the body fabric M ₀ is
When the sewing machine is set in the sewing material conveying device 2 and the start switch of the sewing machine is pressed, the stepping motor STM ₁ starts operating and moves the sewing material conveying device 2 in the cloth feeding direction. When the sewing material conveying device 2 is sent to the position shown in FIG. 6, the sewing machine is activated and sewing is started.
At the same time, the center knife M operates to cut a straight incision S ₀ into the body material M ₀ and the cloth W ⁰ . Seam = D
Air cylinder when only +2d+t ₀ −x is formed
When the AC ₁ is activated, the locking mechanism CP engages the connecting rod 9 with the sewing material conveying device 2 (Fig. 7), and from then on the connecting rod 9 follows the sewing material conveying device 2. .

When a stitch of length L is formed, the sewing machine automatically stops, and at this time, the connected body 9a of the connecting rod 9 and the connecting part 8 of the movable body 8 are
The distance to a is close to x-(L-α). (Figure 8). After this, the sewing material conveying device 2 moves a certain distance D.
(FIG. 8), the material to be sewn is transported in the cloth feeding direction by x-(L-α), and the engaging body 9a of the connecting rod 9 finally connects the connecting rod 8a of the movable body 8. After that, the engaging body 9a of the connecting rod 9
A moving body 8 is driven by the sewing material conveying device 2 via the
The gears 5a and 6a are disengaged, and the second connecting body 6 moves in the cloth feeding direction (to the left in FIG. 1). and,
When the sewing material conveyance device 2 finishes moving the fixed distance D, the stepping motor STM ₁ stops, and the conveyance ends. At this time, the rear end of the incision _S0 in the cloth feeding direction is located exactly above the center knife 14, but on the other hand, the movable body 8, that is, the second connecting body 6 is Since the center knife 15 is moved by D-(x-L+α) in the cloth feeding direction, the center knife 14 is D-(x-L+α)
The distance will be +t ₀ . However, since the microcomputer MC has set α=D+2d+t ₀ -x, the above distance becomes L-2d, and the corner knife 15 is positioned exactly at the tip of the incision S ₀ in the cloth feeding direction. At this time, air cylinder AC ₂ ,
AC ₃ operates simultaneously to form V-shaped incisions Y ₀₀ and Y ₀₁ at both ends of incision S ₀ as shown in FIG.
Thereafter, the air cylinder AC ₄ is activated, the locking mechanism CP is released, and the entire apparatus returns to the state shown in FIG. 1.

Next, as shown in FIG. 12, V-shaped grooves Y ₀₂ are formed on both sides of the incision S ₁ using a corner knife.
A case will be described in which a bead hole is formed such that Y ₀₃ is inclined with respect to the longitudinal direction of the incision S ₁ .

Assuming that the length of the seam is L, which is the same as above, and setting a predetermined value corresponding to the inclination angle of the pocket opening shown as W ₁ in Fig. 10 to digital switch DS ₁ , stepping motor STM ₂ becomes The corner knife 14 of the first rotating body 5 and the corner knife 1 of the second rotating body
5 so as to face each other in the operating position. Then, the first rotating body 5 replaces the adjusting body 20.
The adjusting body 21 fixed on the outer periphery of the adjusting body 21 contacts the roller 19, but since the adjusting body 21 is formed to be thicker by a predetermined amount than the adjusting body 20, Δx=htanθ (θ is As shown in FIG. 12), the stopper 18a is pushed forward in the cloth feeding direction, and the engaging body 9a of the connecting rod 9 also
will move to the left (Figures 1 and 6) by
Therefore, the set value x in FIG. 6 becomes x-Δx. When the body material M ₁ and the welt W ₁ are set in the sewing material conveying device 2 and _the sewing machine is started, one needle bar is set as shown in FIG. Control is performed such that the drive is stopped during _D1 , and two stitches of length L with different starting points are eventually formed.
Since the following operating conditions are the same as those for forming the beading shown in FIG. 11, the description will be made starting from the state in which seam formation is completed, as shown in FIG. 8, with the intermediate steps omitted.

The seam in Figure 12 and the seam in Figure 11 are equal in that the length of the seam is L, but in the seam in Figure 12, one seam is different from the other. Since they are formed at different angles, the amount of fabric feed until the stitch formation is completed is longer in Fig. 12 as a whole, and therefore the cutting amount of the center knife M is longer in the case of the welt edge in Fig. 12.
It becomes longer by htanθ. Now, as shown in FIG.
In the case of the bead hole in Figure 1, the distance between the center knives is D
-(x-L+)+t ₀ , but in the case of the bead hole in Fig. 12, the adjustment body 21 of the first rotating body 5 and the roller 1
9. The distance x (sixth
Figure) is set to x-△x in advance, so in this case the distance between the center knives 14 and 15 is D-(x-
Δx−L+α)+ _t0 . However, since α is set to a constant value D+2d+t0 _- x by the microcomputer MC, by substituting this equation into the above equation, the distance between the center knives 14 and 15 is L-2d+△x=L-2d
+htanθ, and the increment of incision _S1 with respect to incision _S0 in Fig. 12 is △x=htanθ
is compensated for, and a V-shaped incision is made at both ends of the incision _S1 by the operation of air cylinders AC ₂ and AC ₃ .
Y ₀₂ and Y ₀₃ are formed.

Next, other embodiments of the invention will be described. This embodiment differs from the above embodiment in that the distance between the corner knives is adjusted by electrical control of a microcomputer MC. That is, in FIG.
Remove the arm body 18 and the adjustment bodies 20, 21, 22, and move the stopper 18a so that the distance from the connecting part 8a is a certain distance x, as shown in FIG. 6 (not shown).
Fix it to the machine frame.

And it is shown in FIG. When the timing of joining the supporting frame 2a and the connecting rod 9 is q (q indicates the stitch length after the start of stitch formation), q(θ )=α−htanθ (α is the engagement timing between the supporting frame 2a and the connecting rod 9 in the above embodiment). Or program it to memorize the calculation formula. As a result, as shown in the above implementation, the length L, the inclination angle θ
The distance between the corner knives for the seam is D-(x
-L+q(θ)+t ₀ , but the movement of the second rotating body is controlled based on the data from the storage unit, and the distance between the corner knives becomes L-2d+htanθ. Therefore, as in the previous embodiment, the distance between the corner knives is The width will be corrected.

As described above, according to the present invention, in the bead hole forming device that forms a bead hole that is vertically inclined by selecting a corner knife, the cam means Alternatively, the distance between the corner knives can be automatically adjusted under the control of a microcomputer, so even if the pocket hole is slanted, the gap between the central incision and the V on both ends can be adjusted without the need for any adjustment by the operator. It is possible to form a beautiful bead hole in which the cut edge matches the letter-shaped cut portion.

In both of the embodiments described above, the width between the corner knives is set by moving the second rotating body by connecting the sewing material conveying device to the connecting rod via the locking means. For example, a dedicated operating means (stepping motor, servo motor, linear motor) for moving the second rotating body is separately provided, and the width between the corner knives is set by operating this operating means under the control of the microcomputer MC. You can do it like this.

[Brief explanation of the drawing]

1 and 2 are front views of the bead hole forming device according to the present invention, and FIG. 3 shows the first rotating body, roller, arm body,
FIG. 4 is a diagram showing the positional relationship of the corner knife; FIG. 5 is a block diagram of the control circuit; FIGS. 6 to 9 are diagrams showing each stage of transporting the sewing material; Figure 11 is a partial cross-sectional plan view of the bead hole where the opening edge is perpendicular to the central incision, and Figure 12 is a diagram of the welt hole with the opening edge perpendicular to the central incision. FIG. 3 is a partially sectional plan view of an inclined bead hole.

Claims (1)

[Claims] 1. While operating a sewing machine with two needles to sew two stitches horizontally across the body of the cloth parallel to the cloth feeding direction and separated in a direction perpendicular to the cloth feeding direction. An incision of a specific length is made in a straight line parallel to the cloth feeding direction between both seams, and a pair of V-shaped corner scalpels that open outward at both ends of the incision are used to make an incision in the lateral direction of the body. The moving distance is increased in accordance with the size of the inclination angle, and the cloth is moved in the cloth feeding direction so as to correspond to both ends of the incision, and both corner knives are operated to cut V-shaped notches at both ends of the incision. How to form the welt hole to be incised.