JPS5997696A - Cloth shift correcting 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 The present invention provides a sewing machine in which a seam is formed by transporting two pieces of cloth stacked one above the other in one direction using a cloth feed means such as a feed dog. The present invention relates to a cloth deviation correction device for correcting directional deviation.

Conventionally, sewing machines have been designed to sew two pieces of cloth while stacking two pieces of cloth one above the other and transporting them in one direction using a feed dog or a feed roller. is subjected to friction by the presser foot, while the lower fabric is held directly to the feed dog, so the degree of elongation differs between the doshitaura, so ′/
As the cloth is fed, the rear edges of the upper and lower fabrics may shift, and the two pieces of cloth may be sewn onto the sewing table with the rear edges of the fabrics being uneven, resulting in unsightly sewn products and poor quality. There were some drawbacks.

This invention detects the deviation of the edges of the upper and lower fabrics and, based on the information on this deviation, applies a resistance force on the side opposite to the fabric feeding direction to the upper and lower fabrics with different strengths using electrical actuating means. The purpose of this invention is to eliminate the above-mentioned drawbacks of the conventional technology.

Hereinafter, the present invention will be described in detail with reference to the drawings. In FIG. 1, 1 is a table of a sewing machine, and 2 is a presser foot, which always receives a pressing force against the upper surface of a throat plate 3. 4 is a feed dog, which moves four times in conjunction with a main shaft (not shown), and has two a5 W 1 stacked on top of each other.

Hold W2 between presser foot 2 and move it in the direction of the arrow. N is a needle fixed to the lower part of the needle bar, which moves up and down in conjunction with the main shaft. It is possible to penetrate W2. Before the presser foot 2 in the cloth feed direction (right side in Figure 1), there is a 7i5W upper and lower
The resistance applying means 5 for applying a resistance force in a direction opposite to the feeding direction of 45 to each of W 1 and W 2 is a motor M
A rubber roller 6 with high frictional resistance, which can be rotated counterclockwise in FIG.
Receives an elastic force that moves upward from the top surface of J5 W 1,
Electromagnetic solenoid 5 connected to link 7 via link 8
The rubber roller 6 is configured to come into pressure contact with the upper surface of the cloth W1 against the elastic force of the spring 90 by the OLIO bias. The lower resistance applying means 10 includes a rubber roller 11 having a high frictional resistance that can be rotated clockwise in FIG. 1 in conjunction with a motor M2 (FIG. 2), and protrudes into a hole 1k of the table 1 to attach the upper end of the support rod 12. The support rod 12, which is supported in several frames and capable of vertical movement μ, is always subjected to an elastic force by a spring 13 that separates the rubber roller 11 downward from the bottom surface of the cloth W2, and the electromagnetic plenoid connected to the support rod 12 Spring 130 due to the bias of 5OL2
The A shim roller 11 is configured to press against the lower surface of the cloth w2 against elastic force.

In front of the resistance applying means 5 and 6 in the sub-feeding direction (on the right side in Figure 1), there is a mechanism that is rotatable in conjunction with the motor DM about a fixed axis parallel to the feeding direction below the table 1. The end-of-year detector 14, which supports a threaded rod 15 and whose lower end is screwed onto the threaded rod 15, is movable through an opening 1α provided in a table 1iC parallel to the cloth feeding direction.

The cloth edge detector 14 is provided with a separating plate 14C to separate the rear ends of the upper and lower cloths into upper and lower parts, and has two upper and lower recesses 14 that open forward in the cloth feeding direction. α, 14h are formed, and the rear ends of the upper and lower cloths can be inserted separately, and photocouplers 81 consisting of light emitting diodes L and phototransistors F are formed on the upper and lower surfaces of the four parts.
-3 each of S6, that is, photocouplers Sl and S
2. Photocoupler 83. S4, photocoupler S5.
S6 are placed on the same vertical line. The upper and lower surfaces of the separating plate 14C are mirror surfaces so as to reflect the irradiated light from the photocouplers 81 to S6, and a plurality of photocouplers arranged in the cloth feeding direction constitute means for detecting the trailing edge of the cloth. 16.20 is the upper and lower 7I5W 1°W2 is the cloth for applying an appropriate resistance force in the direction opposite to the feeding direction so that it does not easily come out from the recesses 14α and 14A of the cloth edge detection body 14. The upper cloth holding means 16, which is a holding means, supports a rubber roller 17 with high frictional resistance that rotates counterclockwise in conjunction with a motor M2 (FIG. 2) on the lower end of a support rod 18, and the support rod 18 is supported by a spring. 19, the rubber roller 17 is always
The support rod 1
Electromagnetic solenoid s connected to 8.

The rubber roller 17 is pressed against the upper surface of the cloth by the biasing force L3. The lower cloth holding means 2o supports a rubber roller 21 with high frictional resistance, which rotates clockwise in conjunction with a motor M4 (FIG. 2), on the upper end of a support rod 2z, and the support rod 22 is supported by a spring 28.
As a result, the rubber roller 21 is always subjected to an elastic force that separates it downward from the lower surface of the cloth, and the rubber roller 21 is pressed against the lower surface of the cloth w2 by the urging force of the electromagnetic solenoid SOL4 connected to the support rod 22.

In addition, in order to stop the cloth edge detector 14 before it comes into contact with the resistance applying means 5.10, the protrusion 1 at the lower end of the right edge detector 14 is provided.
A limit switch LSW is arranged on the lower surface of the table 1 so as to engage with the limit switch 4d to generate a stop signal.

Next, the control circuit of the present invention will be explained.

In Figure 2, cPU is a well-known central processing unit with calculation and control functions, RAM is a dynamic storage device that can write and read data, and R and OM are static storage devices that can read and write data. As will be described later, data corresponding to the digital signals from the photocoupler 81 to S6 is stored in each address.

First, we will explain the input system of the CPLT that is input through the input port PIO. LSW is the limit switch mentioned above, and SSW is the one that starts and starts the sewing machine through the control of the CPU.
The start/stop switch MSW for stopping is the operation switch FSX that can drive and stop the motor MINM4° motor DM independently from the CPU. On 0
This is an operation switch that can be turned off. Photo coupler 81
The cathode of each light emitting diode L of ~s6 is grounded, and a positive voltage V ty c is applied to the anode through the resistor R1, so that the light emitting diode L is always in a light emitting state. photocabra 8
The output voltage V is applied to the collector of each phototransistor F of 1 to S6.
c c is added, the emitter is grounded through resistor R2,
The emitter voltage of each phototransistor F is individually controlled by an amplifier A1.
The signal is amplified and input to the input port PIO.

The output system of the CPU that outputs data via the PO will be described below. motor Ml of the resistance applying means 5, 10;
M2 is a digital-to-analog converter (hereinafter referred to as D/A)
and can be adjusted in three stages through amplifier A2.

The motor DM of the screw shaft 15 can be controlled to drive and stop individually via the D/A and amplifier A4, and the drive speed is set to a "high speed" higher than the feed speed of the sewing machine, depending on the digital signal input to the D/A. It can be adjusted to three levels: "medium speed" and "low speed." Motor M80M of cloth holding means 16.20
4 enables drive/stop control via amplifier A3. Electromagnetic solenoids 5QLI to 5OL4 are each energized circuit D
It can be energized and deenergized via R.

Next, the control flowchart of the CPU will be explained.
In the figure, after turning on the solenoid, "initial set", that is, move the electromagnetic solenoids 5QLI to 5QL4 to the home position (
After returning to the position shown in FIG. 1), the motor DM is stopped and the 88w flag is reset to "0".

Next, it is determined whether the start switch SSW is on or not, and if it is on, the combination of the SSW flag is converted, that is, rOJ is converted to rlJ or rlJ to rOJ. Next, it is determined whether the limit switch LSW is on or not, and if it is on, the 88w flag is reset to rOJ. Next, the SSW flag is judged, and if the 88w flag is rlJ, the electromagnetic solenoids 5OLI and 5O connected to the resistance applying means 5.10
energize L2 and connect the sewing machine motor connected to the main shaft as l1jel, then turn on and off the phototransistor F of photocoupler 86 to Sl as rOJ, and consider the digital signal as a 6-digit binary code. read.

The ROM contains the speed settings of motor DM, motor Ml,
The address of the ROM to be read is specified so as to control the motor M2, and based on the code of the ROM read in this way, the motor D'M and motor motor M2 are controlled.If the SSW flag is "0", the motor M1 is controlled.

M2 is turned off, electromagnetic solenoids 5OLI and 5OL2 are deenergized, the sewing machine motor is stopped, and the flow ends.

The present invention has the above configuration, and the operation will be explained next.

First, when you turn on the power to the sewing machine, the SSW flag is "0".
At the same time, the electromagnetic solenoid 5QLI~
5QL4 is deenergized, the elastic force of the spring 9.18 causes the rubber rollers 6, 11 to move away from the upper surface of the table 1 in the vertical direction, and the rubber rollers 17.21 are also moved away from the spring 19. '2
The right end detector 14 is vertically separated from the top surface of the table 1 due to the elastic force of 8, and the motor DM is driven to return the right end detector 14 to its home position (Fig. 1).

Next, two pieces of cloth W 1 , W 2 are stacked one on top of the other to form cloth Wl.

The forward end of the cloth W2 in the cloth feeding direction is inserted between the lower surface of the presser foot 2 and the table 1, and the rear ends of the cloths Wl and W2 in the cloth feeding direction are passed between the rubber roller 18 and the rubber roller 21 into the recess 14a.
,, upper and lower cloth Wl for 14A.

W2 are inserted separately, and the cloths Wl and W2 are used to connect the photocouplers Sl, Sa, and S5 to the mirror surface 1'4c, and the photocouplers S2. S4. S6 and the mirror surface 14c are each cut off.

Next, operate the operation switch PSW to operate the electromagnetic solenoid 5.
When OL3, 5OL4 is energized and the motors M3 and M4 are turned on, the rubber rollers 17, 2 and 1 are moved to the cloth Wl.

While holding W2 in the vertical direction, the cloths Wl and W2 are subjected to tension in the direction of arrow B due to the counterclockwise rotation of the rubber roller and the clockwise rotation of the rubber roller 21, and as a result, the cloths Wl and 'W2 are separated into four parts. 14a.

14A (Figure 5B).

When the start switch SSW is pressed in this way, the SSW flag, which is currently reset to "0", is set to rlJ, and then the limit switch LSW is determined, but the material end detection frame 14 is at the home position and the limit switch L
Since the SW is off, the electromagnetic soleoids 5OLI and 5OL2 are energized by the rlJ state of the 5SW7 lug, and the rubber rollers 6 and 11 come into contact with the upper surface of the cloth W1 and the lower surface of the cloth W2, respectively, and the sewing machine motor is started. The feed dog 4 starts four movements and engages the lower surface of the cloth W2, so that the cloths Wl and W2 are transferred in the direction of the arrow. At this time, the 5th B
As shown in the figure, photocouplers Sl, S8. ss and mirror surface 1
4C and photocoupler S2. S4, 86 and mirror surface 1
4C are shielded by cloths Wl and W2, respectively, so none of the phototransistors F of each photocoupler can receive light from the light emitting diode, and is turned off as shown in Figure 4. , the code for driving the motors Ml and M2 counterclockwise and clockwise with "weak" torque, respectively, without driving the motor DM is read from the ROM, so the cloth W
A weak resistance force in the direction opposite to the cloth feeding direction is applied to l and W2. When the cloth feed progresses in this state, the cloth edge detector 1
4 is at rest. On the other hand, since the cloths Wl and W2 move in the direction, the rear edges of the cloths Wl and W2 come close to the photocouplers Sl and S2, respectively, but due to friction with the lower surface of the lower presser foot 2, for example, as shown in FIG. If the upper cloth W1 lags behind the lower cloth W2 and a shift occurs between the cloths W1 and W2, as shown in FIG. The rear edge of the photocoupler S
1 is shielded from the mirror surface 14C, and at this time only the photocoupler S2 directly faces the mirror surface 14c, so the digital signals of the photocouplers (86 to 81) are (ooo).

10). As a result, the CPU stops motor DM, sets motor M1 to "weak" torque, and motor M
2 reads the code from the ROM that indicates "medium" torque, so the resistance force applied by the rubber roller 6.10 is greater on the lower cloth W2 than on the upper cloth W1, and due to the unevenness of this resistance force. The state is equivalent to the upper cloth W2 being pushed back in the opposite direction to the cloth feeding direction with respect to the upper cloth W1, and the deviation between the cloths Wl and W2 is corrected. During this time, the right edge detection body 14 remains stationary, so that the trailing edges of the upper and lower edges Wl and W2 will eventually reach further forward in the cloth feeding direction than the photo covers 31 and 82, respectively, as shown in FIG. 5D. Then, photocoupler 81. Both of S2 face the photo cuff 0 directly to the mirror surface 14c, and the digital signal of (36 to 81) becomes (000011). 2 This makes CP
As shown in Fig. 4, in U, the motor DM is driven at a low speed that is faster than the cloth feed speed of the sewing machine, and the motors Ml and M2 are set to "medium".
Since the code for torque drive is read from the RQM, the cloth edge detector 14 moves in the direction to detect the upper and lower cloths W 1 ,
W 2 catches up with the rear end edge and becomes the state shown in FIG. 5B again, and as mentioned above, the digital signal (ooooooo) of the photo coupler (86 to S1) is generated, motor DM stops, and motors M1 and M2 both become "weak". ” Returns to torque state. These operations are repeated while cloth feeding continues.

In addition, in FIG. 4, (86~S 1 ) = (000
101) and (001010) are cases where one cloth deviates from the other cloth by more than the distance between the photocouplers si and Bs, and in this case, the rubber roller in contact with the cloth in the preceding state is By driving with strong torque, it quickly balances the misalignment between the edges of the fabric.

(86~5l) = (010101) and (101010
) is also the case. Also, (86 to 51) = (00
1111) or (111111), the amount of deviation of both cloths is not so large, but for example, the amount of cloth feed changes and both cloths Wl, W2 move rapidly into the recesses 14a, 14b.
In this case, the motor DM is driven at "medium speed" or "high speed" so that the right edge detector 14 can immediately catch up with the trailing edges of the cloths W 1 and W 2 . Make it.

In this way, the cloth edge detector 14 successively tracks the trailing edges of the cloths Wl and W2, moves in the direction of the arrow (FIG. 1), and moves to the right edge support frame 1.
The protrusion 14d provided at the lower end of 4 is the limit switch LSW.
When it comes into contact with the SS, as shown in the flow chart of Figure 3.
W flag is reset to rOJ, which causes motor M
I, lV[2 are turned off, and the electromagnetic solenoid 5OLI,
5OL2 is deenergized and the rubber rollers 6.11 move the cloths Wl, W.
2, the sewing machine motor is turned off and the sewing operation is stopped.

As described above, according to the present invention, in a sewing machine that transfers two pieces of fabric stacked one above the other in one direction and laces them together, the gap between the two pieces of fabric can be adjusted while tracking the trailing edges of the two pieces of fabric. is detected by an optical detection means such as a photocoupler, and based on this detection information, resistance is applied to each of the upper and lower cloths in the opposite direction to the cloth feeding direction to correct the misalignment between the upper and lower cloths. Therefore, the right edges of the upper and lower fabrics can be aligned, which has the effect of improving the quality of the sewn product.

In the above embodiment, the control information based on the photocouplers (36 to Sl) is stored in the ROM, but such a configuration may also be realized by a hard IC circuit.

In addition, the number of photocouplers (36 to 81) is 6 in the above embodiment, 8 each on the upper and lower sides, but at least 1 photocoupler on the upper and lower sides.
Control is possible if there are only one sensor array at a time, and if the number of sensor arrays is further increased, the proportion of ROM addresses will increase, but correction of fabric misalignment can be controlled more precisely.

Further, in the above embodiment, the cloth is transported by the feed dog arranged below the throat plate, but the cloth feed means is not limited to this, and for example, upper and lower feed dogs, cloth pulling rollers, etc. may be used. The present invention can also be applied to.

Furthermore, the resistance imparting means is not limited to the motor and rubber roller shown in this embodiment, but may also include, for example, separating two pieces of cloth with a separating plate, and suppressing both pieces of cloth separately using an electromagnetic solenoid or the like. Resistance may also be imparted.

Furthermore, in the above embodiment, the cloth detecting body tracks the trailing edge of the cloth as the cloth moves, but the cloth detecting body is extended along the cloth feeding direction, and photocouplers are placed above and below the cloth. On the other hand, by arranging a plurality of cloth detectors facing each other in a long row, it is possible to configure the cloth detectors so that there is no need to move them.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the device of the present invention, Fig. 2 is a block diagram of the control circuit, Fig. 8 is a flowchart showing the control state of the CPU, and Fig. 4 is a photocoupler digital signal read from the ROM. Figures 5A to 5D show the codes to be used.
The figure shows the right end detection state of the sensor array. l...Table, Wl,, W2...Cloth, Φ...Cloth feeding means (feeding dog), 14...Right end detection body, S1-
86...Detection means (sensor array), DM...Driving means (motor), Ml, M2, 6. \1... (resistance)
Appending means, CPU... Control circuit Applicant's name Tokyo Heavy Equipment Industry Co., Ltd. Figure 5A Figure 5com Figure 53 Figure 5D

Claims (1)

[Claims] In a sewing machine in which two pieces of cloth are stacked one above the other on a table, and both pieces of cloth are moved in one direction to form a seam at the seam part, It is placed on the top surface of the table in front of the fabric in the feeding direction to detect the deviation of the trailing edge of both fabrics from the fabric feeding direction, and generates a detection signal indicating which trailing edge is ahead in the fabric feeding direction. The detection means is connected to the table between the detection means and the sutured portion, and is electrically controlled to touch the upper and lower parts of Ti′i separately.
'5 Applying means capable of applying a resistance force along the feeding direction, and applying force that corrects the deviation between both Zfrs in the sub-feeding direction in relation to the detection signal when the trailing edge deviates forward in the sub-feeding direction. A control circuit for controlling a applying means so as to apply the same to one cloth.