JPS6096292A - Drive controller of binding forming apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a sewing machine with two needles arranged in a direction perpendicular to the cloth feeding direction, and the sewing machine stitches the sewing material, welt cloth, and flap cloth along the top surface of the table. The sewing machine is moved a predetermined distance from the front to the front in the cloth feeding direction, and during this movement, the sewing machine is driven to form two parallel seams and a pocket hole is cut between the seams with a cloth cutting knife. This invention relates to a welt tightening machine that presses both ends of a cut pocket hole to cut into an angular shape using a pair of corner knives.

Conventionally, as the above-mentioned welt tightening machine, for example,
- Mechanism described in Publication No. 11681, etc., i.e. No. 1.2
．． This was done using the mechanism shown in Figure 3.

A is a sewing machine in which a main shaft (not shown) is connected to a sewing machine motor 1 and placed on a table 2, and a pair of needles Nl are installed at the lower end.
, N2 and a needle bar 3 which supports the needles N2 and is interlocked with the main shaft, and a cloth cutting knife 4 which extends and retracts above the throat plate in interlocking with the main shaft at a position corresponding to the intermediate portion of both needles.

(The 11' rib B has a presser foot section at its tip that holds the fabric to be sewn W, welt cloth P, and 7-wrap cloth 'F, and the presser section is positioned along the upper surface of the table 2 in front of the sewing point. position and a preparation position where the expected stitching start point of the canvas held in the presser foot is opposite the stitching point;
In addition, a checker feed means C, which is movable in conjunction with the pulse motor 5, to an operating position located after passing the presser foot forward in the movement direction (fabric feed direction) from the sewing point; At the lower position, the welt cloth P can be folded in an inverted T-shape with respect to the cloth W to be sewn by cooperation with the presser foot, and at the upper position where it is separated diagonally upward from that position. The folding means D, which is movable in conjunction with a driving means (not shown) such as an air cylinder, has a pair of corner knives 6.7 that can be moved toward and away from each other along the cloth feeding direction line, and the checkered feeding means B is It is driven when moving from the preparation position to the working position, and the cloth cutting knife 4 is moved at the working position.
This is a corner knife means for forming an angled cut at both ends of the pocket hole cut by the pocket hole.

A transfer table 10 whose lower part is supported by a screw shaft 8 connected to a screw motor 5 and a guide shaft 9 parallel to the screw shaft 8, and whose lower part is movable in the axial direction in conjunction with the rotation of the screw shaft 80; It is supported by a shaft 11 in the upper part, and is always pulled upward by the elastic force of a spring (not shown).
A pair of clamp arms 12.12 that can be pushed down via an air cylinder El (FIG. 1), a presser plate 13.13 fixed to the free ends of both clamp arms 12, and presser plates 13,13. A receiving plate 14 fixedly arranged at a distance above the.
14, the holding plate 13.13 and the receiving plate 14.14, and are always resiliently maintained at the position indicated by the two-dot chain line in Fig. 3 by means of a spring, and are moved to the position indicated by the solid line in the same figure via the air cylinder E2゜E2. Regulation plate that can be moved to 15. Is, and a flap presser foot 16, 16 which is always resiliently maintained at the position shown by the two-dot chain line in FIG. Consists of.

The folding means C includes a presser foot 1T and an elevating body (not shown) which is movable up and down with a predetermined stroke in conjunction with an air motor (not shown), although not shown in detail.

The presser foot IT is supported by a spring force so that it can move vertically relative to the lifting body, and the lifting body and presser foot IT are normally arranged as shown in Figure 1.2. When the elevating body is lowered to its lowest level via the air motor, the presser foot 17 engages with the upper surface of the workbench 4, and the presser foot 17 moves slightly upward against the spring relative to the elevating body. As a result, during sewing, the beading fabric P is always lightly pressed and held on the body fabric W even if its right side changes, and the beading fabric P is caused by friction with the fabric when the needle pierces or pulls out the beading fabric P. It acts to prevent flapping. The checker feeding means B and the cloth folding means C operate to fold the cloth as described in detail in, for example, Japanese Patent Laid-Open No. 57-11681 or No. 57-185887.

In a conventional welding wire machine having such a device, a light emitting part (photodiode) that irradiates light is placed before the needle bar 3 in the cloth feeding direction, and different signals are generated depending on the presence or absence of light (87). two sets of detectors 18 as light detection means using a light receiving section (7o)) transistor);
1g is fixedly arranged on the front surface of the jaw part of the main thin A, and elongated notch holes 20.21 (Figs. 6 to 12) are formed through the flap presser foot 16.16 spaced apart back and forth along the cloth feeding direction. , reflective surfaces R1 and R2 that reflect the light from the detectors 18 and 19 are provided on the upper surfaces of the regulating plates 15 and 150 facing below the notch holes 20 and 21, and the detector and the reflective surfaces constitute a detection section. , when arranging the front and rear edges of the flap cloth F in the notch holes 20 and 21, respectively, to face each other, the sewing machine's sewing start timing is set in relation to the interruption of the reflected light by the right front edge. The timing at which the sewing machine stops sewing, the timing at which the corner knife operates, etc. are set in relation to the re-reception of the reflected light from the reflective surface by the trailing edge of the fabric.

(9) However, in such a conventional device, after the detector 18 or 19 detects the front edge of the seven-lap cloth in the notch hole 20 at the front in the cloth feeding direction, the detector 18 or 19 detects the trailing edge of the flap cloth. Therefore, if a detection signal for the trailing edge of the flap cloth is erroneously generated due to optical or electrical noise before reaching the notch hole 21 at the rear in the cloth transport direction, the sewing machine may not be able to complete the sewing without completing the seam. This caused disadvantages such as the machine stopping or the corner knife operating and forming a 7-shaped groove in the fabric, resulting in wasted product.

This invention aims to eliminate the drawbacks of the above-mentioned conventional ones.

Embodiments of the present invention will be described below with reference to the drawings, but since the mechanical devices are the same as those of the conventional example, the explanation will be omitted and the same numbers will be used.

In FIG. 4, MC is a well-known microcomputer consisting of a central processing circuit CPU, a static memory circuit ROM, and a dynamic memory circuit RAM, and SC is a microcomputer that controls each position of the checkered feeding means B or cloth folding means C. This is a detection circuit that generates various detection signals at the time of detection in relation to the movement detection means that detects movement, etc. and the needle position detection means that detects the rotation angle corresponding to the vertical position of the needle bar of the sewing machine main shaft. This is a setting circuit that is associated with the operating means for performing settings, etc. and generates various setting signals by manual operation, and each detection signal and each setting signal are input to the CPU of the microcomputer MC.

DC is an operation control circuit that controls the operation of each operation means such as the air cylinders E1 to E4, and the sewing machine motor 1, pulse motor 6, and operation control circuit DC are controlled by the CPU according to the chart in FIG. 570.

Next, a flowchart related to movement control of the checkerboard feeding means B shown in FIG. 5 will be explained.

First, the distance 11fG1 (FIG. 6) from the needle drop point (Nl, N2) at the standby position to the front edge of the notch hole 21 at the rear in the cloth movement direction is set as a dummy feed setting amount. Next, the pulse motor 5 starts and the checkerboard feeding means B starts moving.
When the detection state of the detector 18.19 is judged and the light receiving state is switched to the light shielding state, the movement amount L1 from the time of startup is stored in the memory area D1, and this movement iL1, hands Nl, N2, and the detector 18.19 The distance LO and the feed setting amount L- are separated and replaced with the dummy Gl.

Next, the value set by the setting circuit Ha related to the operating means,
That is, the magnitude of the distance L2 from the movement start point to a position a distance S in front of the rear edge of the notch hole 20 in the cloth movement direction and the feed setting amount L- is determined, and when L2 sea L- is detected, the detector 18 .19 judges whether or not the light has been received, and when L2<:L- or when the light is received, the "front end error" subroutine is processed and the transfer means B
is brought to an emergency stop state. If the detectors 18 and 19 do not receive any light, it is determined whether or not the needle drop point has moved to the preparation position facing the front end of the flap cloth F, and the detectors make judgments until the preparation position is reached. and stops the transfer means B when the preparation position is reached.

Next, the distance G1 and the feed setting L# (""'=Dtl +S) are used as the dummy stitch forming feed amount, and Q
l-Lc is set, and then the pulse motor 5 is started to move the transfer means B. At this time, sewing machine A is also driven and needle Nl
, N2 are moved up and down to form a stitch. The amount of movement L+1 from the waiting position is stored in the memory area D2, and L
Count $1 +L o (-L 4 ).

When No. 7 L4'> G1, return to the comparison between L4 and G2 from the rear edge of the notch hole 21 rearward from the feeding start point in the direction of cloth movement, and when receiving light, calculate the count value at that time. The numerical value L4 is stored in the memory area (12) D$ as the set value La, and then it is determined whether the needle drop point has reached the set value L#, that is, whether the sewing stop position has been reached. When this point is reached, checker feed means B is stopped (sewing machine A is also stopped at the same time).

In addition, in comparing the count values L4 and 02, when L4>G2, the needle drop point is shorter than the side 11iiG2 (the position can be set in advance by the operating means) distance GO (#
6), the "rear end error" subroutine is processed so as to stop the checker feeding means B and the sewing machine A.

This invention has the above structure, and when the checkerboard feeding means B is located in the waiting position, the folding means C is in the lower position, and the clamp arm 12.12, the regulating plate 15.15, and the checkerboard feeding means B are in the lower position. Flap presser foot 1
6.16 is the solid line position in Figure 3, and there is a bead + on the body fabric W.
P is bent into an inverted T-shape and folded over, and a 7-wrap cloth F is superimposed and held above one side thereof.

The distance L2 is set by the operating means so as to be in front of the rear edge of the notch hole 20 in the forward direction of cloth movement, and
Set the side @02 so that it is in front of the rear end of the notch hole 21 at the rear in the cloth movement direction, and perform distance GO so that the final needle drop point due to the "back end error", that is, the stop position, is at the rear end of the cloth. Set it so that

When feeding is started from this state, the checker feed means B is moved by the pulse motor 5 driven by the dummy setting value (Gl) while the sewing machine remains inactive, and the detector 18 (or 19) detects the 7-wrap fabric F. (Fig. 1), when the setting amount of feed L a (-L 1
-1-g) is written in place of the dummy set value, and when the movement amount reaches the set value L-, the needle N1 is at the ready position located at the front edge of the 7-wrap cloth F (Fig. 8), and the checker feed means B
will stop temporarily. Notch hole 2 due to bad placement of flap cloth F
0, the detector 18 is in a light shielding state when the rear edge of the notch hole 20 is opposed, and in this case, the feed setting amount L- obtained from the movement amount L1 is equal to the setting amount. Since the flap cloth F is larger than L2, the notch hole 20
Since the front end error does not exist in the front end error subroutine, the sewing machine A is moved to the right and the sewing machine A is driven. Figure 5 70 - As is clear from the chart, the calculated value L4 (, L8 + LO) obtained from the movement amounts I and B
The checker feeding means B continues to move regardless of the state of the detector IB until it exceeds the distance G1 to the front edge of the notch hole 21 at the rear in the cloth moving direction. When the detector 18 enters the light receiving state while the calculated value L4 is between the distances MGI and G2, the calculated value L4 is set as the set value LJ, and when the movement amount L1 force also becomes the set value LI, the checker feed means B and the sewing machine A are stopped. do. On the other hand, due to poor placement of the 7-wrap cloth F or noise such as dust, the calculated value L4 is the distance II! (Set value) If the detector 18 does not enter the light receiving state until the amount of movement Lm becomes larger than G2, a rear end error will occur (Fig. 12).
The setting value corresponding to the preset value QO is set by the rear end error J subroutine, and the movement amount Ll is set to the setting value LJI (
When the set value (15) corresponds to tGO), checker feed means B and sewing machine A
stop.

In addition, in this embodiment, the notch holes 20 and 21 have mirror surfaces R1,
Detectors 18 and 19 are shown, which are formed opposite to R2, and the light from the light emitting body is reflected on the mirror surfaces R1 and R2 so that the light receiving body receives the light. A detector may be disposed facing each other and receives the light from the light emitting body passing through the notch hole 20.21.

In addition, in this embodiment, the notch hole 2 at the front in the cloth transport direction is
Although the distance S at 0 can be arbitrarily set by the operating means H8, it may be set in advance as a program, and the distance Q (1, G2 at the rear notch hole 21 in the cloth feeding direction can be set as desired by the operating means H8). Instead of setting by H8, a predetermined setting may be made in advance as a program.

In this embodiment, the amount of movement is calculated and detected by counting pulses to the pulse motor 5.

(16) According to the present invention as described above, the discrimination means generates a signal when the photoreceptor changes from the light receiving state to the light blocking state, and the front edge in the cloth transport direction of the detection unit related to the rear edge of the cloth receives light. a movement detection means that detects the movement of the checkerboard feeding means until it faces the body and generates a signal; and a light-opening detection means that detects the movement of the checkerboard feeding means until it faces the body and generates a signal from the movement detection means. By providing a control means for disabling the signal, while the checkerboard feeding means moves from detecting the front edge of the flap cloth to the detection section of the rear edge,
Since the signal from the optical detection means is disabled, even if a detection signal for the trailing edge of the 7-lap fabric is generated due to optical or electrical noise during sewing, the sewing machine may stop or the corner knife may be interrupted due to the incorrect detection signal. 1. Since the scheduled stitches can be completed without any interference, efficiency can be improved and product waste can be eliminated.

[Brief explanation of drawings]

Fig. 1 is a front view of the welt forming device, Fig. 2 is a perspective view showing the sewing machine and the clamp section of the checker feed mechanism, and Fig. 3 is a longitudinal section showing the operating state of the clamp section of the checker feed mechanism and the folding mechanism. 4 is a block diagram of the electric circuit of this embodiment, FIG. 5 is a 74-chart, and FIGS. 6 to 12 are explanatory diagrams showing the relationship between the light detection means and the detection section. Applicant name Tokyo Heavy Equipment Industry Co., Ltd.

Claims (1)

[Scope of Claims] A trimming fabric is bent and held in an inverted T-shape on the fabric to be sewn, and a flap cloth serving as a rain cover of a pocket is held in an overlapping manner on one of the folded parts of the trimming fabric. A checkered feed mechanism that allows these cloths to be transferred along the sewing machine table surface across two positions;
To sew the hemline fabric and flap fabric onto the fabric to be sewn by performing two parallel sewing machine stitches on both side folds of the hemline fabric while the fabric is being placed between the above two positions and being transferred. Sewing machines with two needles, and related to starting and floating of the sewing machine,
A knife mechanism for cutting a pot hole parallel to the seam line and the length of the seam line in the fabric to be sewn and the edge decoration fabric between the two edge seams; Separately separate pieces of cloth from each other in the cloth transport direction across the front and rear edges of the trailing edge? The transfer mechanism is equipped with a pair of detection sections capable of reflecting or passing light, and a pair of light emitters and light receivers fixedly arranged opposite to the moving path of the detection sections before the sewing point of the sewing machine in the cloth transport direction. A light detection means capable of outputting different signals by changing the photoreceptor to a light-shielding state and a light-receiving state; storage means for stopping the sewing machine when the fixed point of the terminal end of the stitch reaches the sewing point in relation to the signal output from the light detection means when the light receiving body changes from the light-shielding state to the light-receiving state by starting the sewing machine; The bead forming device has a discriminating means that generates a signal when the photoreceptor changes from a light-receiving state to a light-shielding state, and a checkerboard that generates a signal when the photoreceptor changes from a light-receiving state to a light-blocking state; A movement detecting means that detects movement of the feeding means and generates a signal, and a control that disables the signal of the light-opening detecting means until the signal from the movement detecting means is generated while the signal from the discriminating means is generated. A drive control device for a bead forming device, comprising means. (3)