JPS6182783A - Constant position stop apparatus of sewing machine - 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 1. Field of the Invention The present invention relates to a fixed position stop control device for automatically stopping sewing of a sewing machine at a fixed position.

Description of the Prior Art Conventionally, when sewing a sewn product having crossed edges using a sewing machine, for example, a collar as shown in FIG. 1, each raphe line AB, LS is sewn.
C and CD are the same width a from each A111 edge of the collar.
It needs to be sewn to have a

However, as shown in Fig. 2, if all the sewing is done with the preset stitch length P, there will be an accumulation of fabric feeding errors and the θ stitch length P and raphe line A.
Due to misalignment with the length of B, the line entanglement point B of raphe A B
becomes B' or V, which has the disadvantage of causing an error from point B. In order to solve this problem, the sewing operator manually adjusts the stitch length of the last (b) needle entry, but this method has drawbacks such as poor working efficiency and inability to accurately adjust the stitch length.

OBJECT OF THE INVENTION The present invention improves this point, and allows the sewing machine to automatically stop sewing at a preset position Vζ accurately, and also to prevent uneven stitches and ensure high-quality sewing. The object of the present invention is to provide a fixed position stop control device for a sewing machine that can perform the following steps.

Summary of the Invention The present invention includes a circuit for inputting a stop position of a sewing machine, a circuit for calculating a predetermined line length from the stop position and the number of stitches corresponding to the predetermined line length, and a circuit for calculating a sewing line corresponding to a sewing line of a workpiece. a circuit for detecting the end of the workpiece; a circuit for detecting an error with respect to the predetermined line length when detecting the end of the workpiece; and a circuit for correcting the stitch length by equally dividing the error into the number of stitches; The present invention is characterized by comprising a circuit that adjusts the feed rate of the workpiece in accordance with the corrected stitch length, and a circuit that stops the sewing machine when the sewing point after detecting the edge of the workpiece reaches the number of stitches. shall be.

Explanation by example An embodiment of the present invention will be described based on the drawings.

FIG. 6 shows a main part configuration diagram of a cloth edge detection circuit according to an embodiment of the present invention. A light emitting element 2 is fixed at a predetermined position in a direction opposite to the traveling direction of the workpiece cloth 1 from the needle hole, and a light receiving element 5 is placed at a position in the needle plate 3 corresponding to the light emitting element 2VC.

stick.

FIG. 4 is a diagram showing the cloth edge detection state of the cloth edge detection circuit shown in FIG. 6. In FIG. 4, the workpiece cloth 1 is shown partially cut away. Further, 6 indicates the needle hole of the throat plate, 7 indicates the raphe line corresponding to the end of raphe line AB in FIG. 1, and 8 indicates the first raphe line.
A raphe corresponding to the beginning of raphe BC in the figure is shown. raphe 7
Each sewing point e is sewn with a stitch length P set in advance using a stitch length dial or the like.

In this state, the cloth edge 11 of the workpiece cloth 1 is connected to the light emitting element 2 (the third
When the light receiving element 5 detects the emitted light from the light emitting element 2 and outputs a detection signal, the cloth edge 11 is detected as shown in FIG. 4.

Here, as described above (the light-receiving element 5 is fixed at a fixed distance from the center of the needle hole 6, and this fixed distance Y can be determined physically), the entanglement point B of the raphe 7 is This is the position at which this sewing machine should automatically stop, and is determined in advance by setting the width a' from the fabric edge 11 using a setting dial, etc. Therefore, the length to be sewn after the fabric edge 11 is detected SaYomoY 'o -Y -a' ・・・・・・・・・
...mountain). As a result, the number α of stitches to be sewn for the length Yo is determined using the stitch length P currently being sewn. At this time, in order to convert the number of stitches α into an integer, a correction such as 4 to 5 is performed.

Furthermore, the sewing point I shown in FIG. 4 indicates the sewing point where sewing is performed at the VC stitch length P immediately after the cloth edge 11 is detected, but as shown in FIG. 5, the sewing point I and the center of the needle hole 6 are The distance e is an error for the length YO.

Next, an error detection circuit for detecting this error l will be explained. FIG. 6 shows a principle diagram of the error detection circuit, FIG. 7 shows an operation explanation diagram, and FIG. 8 shows a configuration diagram of main parts of the error detection circuit 13.

Here, the error g is the insufficient feed amount of the cloth speed V1 amount P to form the sewing point J at the time of detecting the cloth end 11, and this feed shortage ht is the feed tooth of the sewing machine ( What phase (not shown) on the cloth feed locus (No. 61.21) can be determined by Aroka. In other words, Fig. 6 shows the feed dog that realizes the cloth feed amount P (set stitch length). This is the trajectory, and the effective section for feeding the cloth (upper half of Figure 6) is →K.

The point at which this is divided into 5 equal parts (generally divided into n equal parts) with respect to the horizontal feed amount is 4. K1. K2. It is shown as K.

Now, if the phase of the feed dog is 1 at the time of detecting the cloth end 11, the feed dog is further [K] due to the insufficient amount of feed.

The amount of cloth sent from KoVC to KoVC is 115P, and similarly if it is 2, it is 215f'
If it was , then it would be 315P, and if it was 4, then it would be 415P. Also, due to the nature of the fabric feed mechanism of the sewing machine, the feed dog phase is K. At any point from to to , the amount of feed shortage (ie, error) corresponds to zero.

The state of this error l is shown in FIG. In FIG. 7, the same reference numerals as in FIGS. 4 and 5 indicate the same parts. Further, in FIG. 7, 16 indicates the center line of the needle hole 6, and I~
3 shows the state of each press-stitch line after the cloth edge 11 is detected in this embodiment. That is, in FIG. 7, the distance between the center line 16 and the stitch 76.7 is g, , e2. e3. Gi.

or insufficient feed as explained in FIG. 6] 115P, 215P.

315P, 415P vt:, respectively corresponding, sewing I
and IV indicate the case where the amount of underfeeding, that is, the error l (FIG. 5) is zero. Further, the case where the number of stitches α is 5 is shown.

FIG. 8 is a diagram showing the main parts of the error detection circuit 1 and the control section 14, and the upper shaft 18vc has a disk 19 formed of an insulator fixed thereto. At each point on the circumference of this disk 19, , K
,, , K2. K, and K. Electrodes 20.21.22 corresponding to the upper axis phase when in the 1<7 section.

23 and 24, and provide a fixed brush 26 which successively contacts this electrode.

Further, reference numerals 28 and 29 in FIG. 8 indicate a slip ring mechanism that connects each of the above electrodes to the fixed wiring.

The outputs of the slip ring mechanism 29 and the fixed flare 26 are connected to a detection circuit 61. The output of this detection circuit 31 is connected to a control circuit 32, preferably a microprocessor. The output of the cloth edge detection circuit is connected to this control circuit 32 via an amplifier 63.

The control circuit 321 also includes a read-only storage circuit 4 which stores the control program. Arithmetic circuit 5. A stitch length setting circuit 36 that encodes and inputs the set value of the stitch length (determined by the sewing allowance length) and a stop position setting circuit 67 that encodes and inputs the stop position of the min/min are connected, respectively. The control circuit 32 also includes a stitch length setting machine 4ut shown in FIG.
39 a-taleen lenoid 45 lenoid active circuit 4
Connect 0. In addition, this lensoid drive circuit 4Qvc
The output of the photosessor 47 of the stitch length setting mechanism 69 is connected.

FIG. 9 shows a wall configuration diagram of the stitch length setting mechanism 690. A stopper 44 is fixed to the feed adjustment shaft 46, and this stopper 4
A drive arm 46 of a rotary lunoid 45 is pivotally attached to 4, and a photosensor 47 is fixed so as to detect the rotation angle of the drive arm 46. Further, in FIG. 9, 50 indicates an advancing lever, 51 indicates an advancing arm, 52 indicates a reverse edge rotor l', and 53 indicates a feed adjuster.

Here, the feed regulator 56 is of a known type and is of the tenth type.
Figure (al) shows the setting state of feed 4 fish, Fig. 10 (b) shows the setting state of feed 2 fish, and Fig. 10 (c) shows the setting state of feed 0 fish. In Fig. 10, 56 is Lower axis.

Reference numeral 57 indicates a crank rod, and 52 indicates a reverse stitching rod.

To explain the characteristic error j adjustment operation of the present invention with reference to FIGS. 7, 8, and 9, the cloth edge 11 is detected by the light emitting element 2 and g light receiving element 5 of the cloth edge detection circuit. If this occurs, the control circuit 32 detects this and detects the error at this time, that is, the amount of insufficient feed, as 12, g3, 14, or zero from the detection circuit 61 of the error detection circuit 15. On the other hand, the control circuit 2 receives the width a from the stop position circuit 67.
', and based on this, the arithmetic circuit 35 performs the calculation of the above-mentioned It formula to set the length YO, and determines the set stitch length P from the stitch length setting circuit 66, and based on this, the above-mentioned length YO is determined. (2) The calculation of 3C is performed by the arithmetic circuit 35 and the number of stitches α is stored.In this example, the number of stitches α is assumed to be 5 in the following explanation.

In this state (0), the control circuit 32 adjusts the length Y based on the number of stitches 5 and the detected error (for example, the thread 1 and the raphe line ■ in Fig. 7).
The corrected stitch length γ for sewing O is γ2P −-= l
-1, A (3) The arithmetic circuit 35 calculates α, and the error g1 is divided equally into the stitch length of the number of stitches α (=5).

Other errors are 4+. 14 is detected, but when the error is zero (raft lines ■ and ■ in FIG. 7), correction is unnecessary and sewing is performed at the set stitch length P.

The control circuit 62 adjusts the stitch length γ based on this corrected stitch length γVc.
A code indicating this is set as an output to the solenoid drive circuit 40. The solenoid drive circuit 40 converts the stitch length γ code into analog and uses a photo sensor 47 to indicate the number of stitch pinch settings.
The coil of the rotary solenoid 45 is energized with a current having a current value such that the output of the photosensor 47 becomes equal to the analog value of the code. This sets the corrected stitch length γ.

With this corrected stitch length γ, sewing from point 0 I immediately after the detection of the cloth edge 11 is performed as shown in FIG. In this state, the control circuit 62 monitors the number of stitches, and when the number of stitches reaches α (=5), outputs a stop signal to stop the sewing machine.

Here, although the above embodiment shows an example in which the number of stitches α is calculated and set, it may be set as a constant number in advance.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a desired stop position of the sewing machine is input, a predetermined sewing length and the number of stitches from the stop position are calculated based on the input, and when the fabric edge is detected, θ) the predetermined sewing length is calculated. An error in the sewing length is detected, the error is divided equally into the number of stitches to correct the stitch length, and the sewing machine is stopped after sewing the number of stitches at this corrected stitch length.

Therefore, the sewing machine can be automatically and accurately stopped at the desired position of the line entanglement point, and the stitch length can also be corrected automatically and uniformly, resulting in high-quality sewing. Has excellent effects.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of the prior art, FIG. 6 is a schematic diagram of a cloth edge detection circuit according to an embodiment of the present invention, and FIGS. 4, 5, and 6 are diagrams of a cloth edge detection circuit according to an embodiment of the present invention. An explanatory diagram of error detection. FIG. 7 is an explanatory diagram of the operation of one embodiment of the present invention. FIG. 8 is a block diagram of main parts of an error detection circuit and a control section according to an embodiment of the present invention, and FIG. 9 is a block diagram of main parts of a stitch length setting mechanism according to an embodiment of the present invention. FIG. 10 (al to fcl are explanatory diagrams of feed adjusters.

Claims (1)

[Claims] (1) A circuit for inputting the stop position of the sewing machine, a circuit for calculating a predetermined stitch length and the number of stitches corresponding to this predetermined stitch length based on the stop position, and a workpiece corresponding to the sewing line of the workpiece. a circuit that detects an edge; a circuit that detects an error with respect to the predetermined stitch length when detecting the edge of the workpiece; and a circuit that corrects the stitch length by equally dividing the error into stitch lengths of the number of stitches. , a circuit that adjusts the feed amount of the workpiece in accordance with the corrected stitch length, and a sewing point immediately after detecting the end of the workpiece (
g) When the number of subsequent sewing points reaches the number of stitches and there is no error, the sewing machine is equipped with a circuit that stops the sewing machine when the number of sewing points after the detection of the workpiece reaches the number of stitches. Stop device.