JPS6040311B2 - Safety device for beading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION As shown in FIGS. 14 and 15, the present invention comprises folding a trimming cloth P into an inverted T-shape and overlaying it on the sewing cloth W constituting the front body of the garment. Furthermore, after overlapping the flap cloth F on the edge decoration cloth P, these cloths are transferred from the first layer to the second layer across the sewing point of the sewing machine (the passing point of the needle 9 relative to the sewing plane), and this transfer In the dark, two parallel sewing machine stitches S and S are made inward from the bent ends on both sides of the hemline fabric P, and at the same time as these fabrics are sewn together, these two stitches are sewn together using a knife that operates in synchronization with the sewing mechanism. This invention relates to a welt edge forming device which cuts out a pocket hole between the seam lines S and S of a book.

In this type of device, conventionally, as shown in FIG. 12, a reflective surface R is provided below the flap cloth F along the transfer direction (arrow in the figure), and a reflective surface R is provided opposite to the reflective surface R. A photodetector pupil consisting of a pair of light emitters When the front end of the flap cloth F reaches the sewing point of the sewing machine, the sewing machine is driven to start sewing.

However, in the conventional method, as shown by the two-dot chain line in Fig. 2, obstructions A such as threads and dust accumulate on the reflecting surface R, and the reflectance of the reflecting surface R decreases, causing the photoreceptor Y. Luminous body X entering
When the intensity of the reflected light from the light emitter X becomes less than a predetermined standard, when the obstacle A on the reflective surface R faces the light detection device during transfer of the cloth, the light from the light emitter X is also blocked by the flap cloth F. Therefore, the sewing machine starts even though the flap cloth F has not yet reached the total point of the sewing machine.In other words, as shown in Figure 3 A, the sewing machine should normally start later. It should start from point b in Figure 15, but it should start from point a earlier, form two parallel seams S and S, and at the same time use a scalpel to cut between those seam lines S and S. As shown by the two-dot chain line, the original pocket hole date (solid line)
There was a drawback that the cut was made from point a, which was far before the point.

In this invention, a light detection device consisting of a pair of light emitters and a light receiver is fixedly arranged one distance (shorter than the length of the flap cloth) from the general point of the sewing machine, and the light of the light emitter is blocked and the light is received. The front edge of the flap cloth is detected in relation to the body being in a light-blocking state (if there is an obstacle in front of the flap cloth, the front edge of the obstacle is detected), and the front edge of the flap cloth is detected and then the flap The above-described drawbacks of the conventional method are solved by stopping the transfer of the flap cloth when the photoreceptor enters the light-receiving state (the rear end of an obstacle is detected) while the cloth is transferred one distance. Embodiments of the present invention will be described below with reference to the drawings.

The bead forming device shown in FIG. 1 is composed of a sewing machine 2 placed in the middle on a work table 1 and a sewing cloth W, as described in the patent application No. 53-69129 filed by the applicant of the present application. ,
The edging cloth P and the flap cloth F are moved along the upper surface of the work table 1 from the first layer (the position indicated by the two-dot chain line in FIG. 2) to the second layer (the first and second The fabric transfer mechanism 3 for transferring the material to the position indicated by the solid line in the figure) and the regulation plates 4, 4 provided on the fabric transfer machine 3 in the first place calendar work together to control the sewing material as shown in Fig. 3. Each of the above-mentioned fabrics was transferred to the second position by a folding mechanism 5 having a presser foot 22 for folding and superimposing the green decorative fabric P on the fabric W in an inverted T-shape, and by the fabric transfer mechanism 3. At this time, a corner knife mechanism 7 for making an oak-shaped incision at both ends of the pocket hole H cut in the back cloth W and the green decorative cloth P by the center knife 6, the T sewing machine 2, and the above-mentioned mechanisms 3, 5, and 7 are installed. It consists of a control device (Fig. 5) for controlling in a scheduled order. sewing machine 2
The sewing machine motor has two needles 9, 9 at the lower end of the needle 8.
This is a well-known two-needle sewing machine that is linked to the sewing machine No. 45, and between each needle hole on the throat plate (not shown) is a needle in the cloth transfer direction (left side in Figures 1 and 2).
A slit (not shown) parallel to the top and bottom is formed through the top and bottom,
Inside this slit, the center knife 6 is connected to the needle bar 8 for cutting out the covering cloth W and the pocket hole of the border cloth in conjunction with an operating mechanism (not shown) disposed in the sewing machine pet.
It is provided so that it can appear and retract from the top surface of the needle slope at the same time.
The work table turtle is formed with a groove 10 extending vertically in the fabric transfer direction at the rear of the sewing machine 2, and a pair of Annai ratchets 11 and screw balls 12 are formed along the groove 10' on the lower surface of the work table turtle. It is supported by support frames 13, 13, and the screw shaft 12 is connected to a transfer motor (pulse motor) 1.
It is designed to rotate forward and reverse in conjunction with 4.

As shown in Figures 2 and 3, the cloth transfer mechanism 3 has a base whose lower part is supported by the screw shaft mechanism 2 and the guide shaft 11 and is movable in the axial direction in conjunction with the screw shaft mechanism 2. Base 15 protrudes from the top surface of the work table via the groove 10
A pair of clamp arms 19 are supported by a shaft 16 in the upper part and are normally pulled upward by the acting force of a spring 17, and are pushed downward against the spring 17 when the air cylinder 18 is activated. , 19 and each clamp arm 1
9, 19 First clamp plate 20, 20 fixed to free machine
and receiving plates 21, 21 which are spaced apart and fixedly arranged above the first clamp plates 20, 20, and arranged between the first clamp plates 20, 20 and the receiving plates 21, 21, and when the air cylinder 23 is operated. A pair of regulating plates 4, 4 are movable from the two-dot head line to the position shown by the solid line in FIG. 3, and are always pulled up to the position shown by the two-dot chain line in FIG.
When the air cylinders 25, 25 operate, the springs 24,
It consists of a pair of second clamp plates 26, 26 which are pressed against the clamp plate 24 to the position shown by the solid line in the figure.

The relationship between the cloth transfer mechanism 3 and the folding mechanism 5 is such that the front body of the garment is placed between the lower surface of the first clamp plates 20, 20 and the upper surface of the work table 1 at the first position indicated by the two-dot chain line in FIG. By inserting the (fabric to be sewn) W and depressing a suitable foot pedal (not shown) to the first stage, the air cylinder 18 is actuated and each clamp arm 19 is moved against the spring 17 to the first position. The first clamp plate 20 is rotated clockwise in Figure 1.
, 20 are lowered to weigh and press the fabric to be sewn W, then insert the edge decoration fabric P so that its center is positioned between the inner edges of the first clamp plates 20, 20, and press the foot pedal to the second position. By stepping down to the second stage, the presser foot 22 of the folding mechanism 5 descends between the inner end green spaces of the first clamp plates 20, 20, and presses the center of the green decorative fabric P onto the fabric W to be sewn. , air cylinder 2
3 is activated, each of the regulating plates 4, 4 moves from the two-dot chain line to the position shown by the solid line in FIG. Fold the flap fabric F into an inverted T-shape, and then fold the flap fabric F constituting both lids onto one of the receivers so that the green end to be attached is located on one of the folded parts of the hemline fabric P. By placing it on the board 21 and depressing the foot pedal to the third stage, the air cylinders 25, 25 are activated.
is actuated, the second clamp plates 26, 26 are rotated to the position shown by the solid line in FIG. 3, and are pressed onto the folded portion of the green decorative cloth F.

For the detailed structure and operation of each mechanism and each part described above, please refer to the specification and drawings of Tokuiso Sho No. 53-169129 cited above.

The second clamp plates 26, 26 have elongated notch holes 27, 27 and 28 at two places on the front and back, respectively, along the cloth transfer direction.
28 are formed vertically through the holes, and each of these notch holes 27
, 28 are provided with reflective surfaces R, , R2 (detection portions) on the upper surfaces of the regulating plates 4, 4, which are opposite to each other along the entire length thereof.

As shown in Figures 1 and 2, on the front side of the jaw of the sewing machine 2, the vertical junction of the sewing machine 2 (needle 9 relative to the bed plane,
Light is irradiated from above at a position a predetermined distance 1 (hereinafter referred to as 1 sun) in front of the passing point 9) toward the movement path of each reflective surface R,, R2 in the set state shown by the solid line in Figure 3. It has a built-in light emitting element A pair of photodetecting devices 29, 29 that generate irradiation are fixedly arranged.

In this embodiment, the photodetectors 29, 29 detect a maximum of 11 when the reflected light from the light emitter A voltage of volt is generated, and the light from the light emitter X is applied to the flap cloth F.
When the circuit is completely shut off, no voltage is generated. As shown in FIGS. 1 and 2, below the work table 1, the base 15 of the cloth transfer mechanism 3 has a front detection section 30 and a rear detection section 31 spaced apart from each other by a distance n longer than the distance n in the cloth transfer direction. The detection plate 32 provided is fixed via a support arm 33, and the detection plate 3 is mounted on the work table 1 during cloth transfer.
The position detection device 34, which is close to the moving path of each of the detection units 30 and 31 of 2 and has a non-contact switch inside, is mounted on the support arm 3.
Fixed placement via 5.

Further, positioning means 36, 36 are provided on the upper surfaces of the receiving plates 21, 21 so that the rear ends of the flap cloths F can be moved and locked slightly in the cloth transfer direction on the reflective surface R2 facing the openings 28, 28. The detection plate 32 is normally arranged so that the rear detection part 31 is detected by the position detection device 34 when the position specified by the positioning means 36, 36 coincides with the sewing point of the sewing machine 2, as shown in FIG. The light detection device 2 is connected to the positioning means 36, 36, and the front detection section 3 is connected to the positioning means 36, 36.
The detection point 9 is located on the second clamp plate 26 as shown in FIG.
, 26 are set so as to be detected by the position detection device after passing through the rear ends of the notch holes 27, 27 in front of the holes 27, 26.
Next, to explain the block diagram of the electric circuit shown in Fig. 5, the central control unit (hereinafter referred to as CPU) stores information for controlling each mechanism in a predetermined order and outputs the information. Static storage device (hereinafter referred to as RO)
M) and a dynamic storage device (hereinafter referred to as RAM) capable of inputting and outputting predetermined information are connected, and a one-inch memory 38, a transfer motor control circuit 39, and a position detection device are connected via a data bus 37. Control circuit 40, sewing machine motor control circuit 41, light detection control circuit 42, emergency stop processing circuit 43
and an air cylinder solenoid valve control circuit (not shown).

The 1 inch memory 38 is composed of two dip switches, and sets the rotation of the transfer motor 14 to a desired numerical value in millimeters as the moving distance of the cloth transfer mechanism 3, and sets the set values as 1 inch at the front end and 1 inch at the rear end. Each item can be memorized separately. Further, as shown in FIG. 7, the photodetection control circuit 42 compares the input voltages of the (10) and (1) terminals, and the input voltage on the (10) side is higher than the input voltage on the (1) side. Two amplifiers OP, (hereinafter referred to as the first comparator circuit) and OP2 (hereinafter referred to as the first comparator circuit) output a logically low level (0) signal when the signal is small, and output a logically high level (1) signal when the opposite is true. The first comparison circuit OP consists of a transistor Tr, an inverter G, , G2, a start signal flip-flop FF, a start switch SW, and an AND gate G3.
It is connected to the output of a voltage generation circuit (not shown) that generates a reference voltage of 2 volts, and the (-) terminal is connected to the photodetector 2.
The second comparator circuit OP2 connects the (-) terminal to the output terminal of a voltage generating circuit (not shown) that generates a reference voltage of 3.2 volts, and connects the (10) terminal to the optical Connect to the output terminal of the detection device 29. Also, the first comparison circuit OP
The output side of , is connected to the transistor T via the inverter G,
The input side of the flip-flop FF is connected to the collector of the transistor Tr, the start switch SW is connected to the outside of the transistor Tr, and the output terminal of the flip-flop FF is branched into two. One side is directly connected to the data bus 37 and the other side is connected to the gate G3, and the output side of the second comparison circuit OP2 is connected to the gate ○3 via the inverter G2, and the output side of the gate ○3 is connected to the gate ○3. This configuration is connected to a data bus 37. The present invention has the above configuration, and its operation will be explained next.

First, when the power is turned on, the CPU operates and determines whether the cloth transfer mechanism 3 is in its initial state. If it has not returned to the first layer indicated by the two-dot chain line in Figure 2, an individual switch (not shown) ), the transfer motor 14 is reversely rotated based on the information in the ROM, and the cloth transfer mechanism 3 is returned to the first layer. At this time, each air cylinder is in an inactive state, and each clamp arm 19, 19 is rotated counterclockwise by the action of the spring 17, and the first clamp plate 20, 2 is raised from the work table 1, and each regulation The plates 4, 4 are forcefully maintained in the position indicated by the two-dot chain line in FIG.
In addition, the presser foot 22 of the folding mechanism 5 is raised from the work table. Therefore, between the lower surface of the first clamp plate 20 and the upper surface of the work table ~ the front body of the garment (fabric to be sewn)
W is inserted and the first clamp plates 20, 20 are lowered. Next, the hemline cloth P is placed on the first clamp plates 20, 20, and the presser foot 22 is lowered, and then the regulating plate 4, 4 and receiving plate 2
Place the flap cloth F on 1 and 21 and attach the second clamp plate 2.
6, 26 is lowered, thereby each cloth W, P, F is placed in the third
When set as shown in FIG. ,2
Expose from 8.

In addition, at this time, the light detection device 29 faces the notch hole 27 in the front as shown in FIG. The light is received by the photoreceptor Y, and the photodetector 29 detects 11
At the same time as a voltage of volt is generated, the output of the first comparator circuit OP becomes (L), and an (H) signal is input to the base of the transistor Tr via the inverter G. Therefore, when the start switch SW is closed from this state, the transistor Tr is turned on, thereby setting the flip-flop FF and outputting an (H) signal from the output terminal, and one of the signals is input to the gate G3. The other one is input to the CPU as a transfer motor drive signal, and as a result, the information in the ROM is commanded from the CPU to the transfer motor control circuit 39, and the transfer motor 14 starts rotating in the forward direction. The cloth transfer mechanism 3 is the second
Move from the position indicated by the two-dot chain line in the figure to the left in the figure at a rapid traverse speed.

Also, at this time, the output of the second comparison circuit OP2 is (H).
Then, the input of gate G3 via inverter G2 becomes (
L), the gate G3 does not open and the sewing machine motor 45 remains stopped. Next, as shown in FIG. The input on the (10) side of OP2 is 4. lower than the input reference voltage on the (1) side (0:3.2), and its (L) output is inverted by the inverter G2 and applied to the gate G3.
is input.

At this time, the transistor Tr is turned off, but the (H) output of the flip-flop FF continues to be applied to the gate G.
3, the gate G3 is opened and its output signal is input to the CPU. As a result, the information of 42 mm in the 1 inch memory at the front end is read out by the CPU command based on the information in the ROM and latched into the RAM, and from that point on, the interface circuit of the transfer motor control circuit 39 controls the transfer motor The movement distance of the cloth transfer mechanism 3 is added up one by one as a numerical value expressed in millimeters, and this is compared with the 1-inch information latched in the RAM, and when they match, that is, from the state shown in Figure 8. When the cloth transfer mechanism 3 moves one distance and the front end of the flap cloth F matches the needle 9 (sewing point of the sewing machine) as shown in FIG. When the needle reaches the front of the needle, for convenience it is assumed here that they match), the drive information in the ROM is commanded to the transfer motor control circuit 39, the transfer motor 14 stops temporarily, and then rotates again at the sewing speed. At the same time, information in the ROM is transferred from the CPU to the motor control circuit 4.
1, the sewing machine 2 starts moving via the sewing machine motor 45, and as a result, as shown in Figs. Cut a pocket hole between seams S and S using the center knife 6. Next, when the transfer of each cloth progresses to the state shown in FIG. Decide what you have entered.

When the transfer of each cloth progresses to the state shown in FIG. When the photodetector 29 enters the light receiving state and generates a voltage of 11 volts, the output of the first comparison circuit OP becomes (L) again, the transistor Tr is turned on again from the off state, and the flip-flop FF is reset.

As a result, when the (H) output of the flip-flop FF disappears, the information in the 1-inch memory at the rear end is latched to the RAM by a command from the CPU, and from that point on, the transfer motor control circuit 3
By the interface circuit 9, the rotation of the transfer motor 14 is successively added to the value converted into millimeters of the moving distance of the cloth transfer mechanism 3, and this is compared with the 1-inch information latched in the RAM, and when the two match, the value is added. That is, when the cloth transfer mechanism 3 moves one distance from the state shown in FIG. Sometimes needle 9 is flap cloth F
This is when the rear end is reached one or two stitches later, but for convenience we will assume that it is a "match"), and the stop information in the ROM is C.
A command is issued from the PU to the transfer motor control circuit 39 and the sewing machine motor control circuit 41, thereby causing the cloth transfer mechanism 3 and the sewing machine 2 to stop. This is shown in a time chart as shown in FIG. Immediately after this, the cloth transfer mechanism 3 is again moved to the second position by a command from the CPU, and the front and rear ends of the pocket holes are made to face the corner knife mechanism 7, and in conjunction with the cloth transfer mechanism 3 being stopped. After the corner knife mechanism 7 is activated by a command from the CPU, each air cylinder becomes inactive, and the first clamp plates 20, 20, second clamp plates 26, 26, regulation plate 4, year, and presser foot 22 are activated.
are opened to their inactive positions, releasing each cloth W, P, F. The above effects occur when there is no dirt or dust on the reflective surfaces R, R2, and when there are obstacles such as dirt or dust on the reflective surface R as shown in Figure 12, as indicated by A. The action is as follows.

That is, in the pre-start state of FIG. 8A, before the photodetector 29 faces the obstacle A, the first comparison circuit OP. The output of the transistor Tr becomes (L) and the base of the transistor Tr becomes (H
), when the start switch SW is closed, the flip-flop FF is set and the cloth transfer mechanism 3 starts moving from the first layer to the second position. Then, the photodetector 29 faces the front end of the obstacle A, and when the output voltage of the photodetector 29 becomes equal to or lower than the reference voltage (3.2 volts) of the second comparator circuit OP2, the gate G3 opens and the signal is sent to the CPU. In the same way as when the front end of the flap cloth F is detected, the information in the 1-inch memory of the front end is latched into the RAM, and from this point on, the transfer motor control circuit 39
The moving distance of the cloth transfer mechanism 3 and 1 inch are compared by the interface circuit. However, the information in the 1 inch memory is R.
After being latched by the AM, the photodetector 29 faces the rear end of the upper obstacle A before the fabric transfer machine base 3 moves one inch, and the output of the photodetector 29 is transferred to the second comparison circuit. O
Even if the voltage exceeds the reference voltage of P2 and the gate G3 is closed, if the front detection section 30 of the detection plate 32 is not detected by the position detection device 34, the emergency stop information in the ROM is set to CP.
A command is issued from U to the emergency stop processing circuit 43, the transfer motor 14 is stopped, and the movement of the cloth transfer mechanism 3 is stopped at that position. In this case, by operating the reset switch, the cloth transfer mechanism 3 is returned to the initial layer by filling in the information in the ROM. Also, as shown in Figure 2, there is a B on the reflective surface R2.
When there is an obstacle such as dirt or dust as shown in FIG. 8, the operation from FIG. 8A to FIG. 8B is the same as when there is no obstacle on the reflective surface R. As shown in FIG. 8, when the rear end of the flap cloth F faces the photodetector 29, if the output voltage of the photodetector 29 is less than the reference voltage of the second comparison circuit OP2, the CPU still detects the photodetector. It is determined that the device 29 has not detected the rear end of the flap cloth F, and the cloth transfer mechanism 3 and the sewing machine 2 continue to operate, but as shown in FIG. When the position facing the needle 9 is reached, the rear detection part 31 of the detection plate 32 is detected by the position detection device 34 at that position.
As a result, the stop information in the ROM is commanded from the CPU to the transfer motor control circuit 39 and the sewing machine motor control circuit 41, and the cloth transfer mechanism 3 and the sewing machine 2 are stopped at the position shown in FIG. Next, there are obstacles such as dirt and dust on the entire surface of the reflective surface R, and in FIG. also becomes low, the output of the first comparator circuit OP becomes (H).
As a result, the base of the transistor Tr becomes (L), so even if the start switch SW is closed, the transistor T remains
r remains ○FF and the flip-flop FF is not set, so the CPU does not issue a start command to the transfer motor control circuit 39 and thin motor control circuit 41, and the cloth transfer mechanism 3 and sewing machine 2 do not start. . As mentioned above, in this case, if the start switch SW is closed after cleaning the entire surface of the reflective surface R and removing the above-mentioned obstacles, the cloth transfer mechanism 3 and the sewing machine 2 will be controlled in a predetermined order. That's right. The above-mentioned action is shown in a time chart as shown in FIG. 6, and shown in a flow chart as shown in FIG. 9. Here, the emergency stop check means that the sewing thread is not cut, but the air pressure is not lower than the predetermined pressure, the pulse motor (transfer motor 14) is not out of step, or there is an overcurrent in the sewing machine motor 45. This is a function to check whether there is any flow, and also to check if the detection plate 32 is
is the front end of the front detection unit 30, and @ and ■ on the detection plate 32
refer to the front end and rear end of the rear detection section 31. Note: Is the distance 1 from the stitching point (needle 9) of the sewing machine to the detection point of the photodetector 29 constant? Each of the beginning and end of sewing changes for the edge.

Further, as shown in the flowchart of FIG. 9, the detection plate 32
In connection with detecting the front end (2) of the rear detecting section 31a with the pupil detection lens 34, the transfer motor 14 is lowered from the sewing speed to a low speed in response to a command from the CPU to prepare for the next stop.

As described above, the present invention allows the photoreceptor of the photodetector to enter the light-receiving state between the time when the light-receiving member of the photodetector is in the light-blocking state after the start of the cloth transfer mechanism and the time when the scheduled signal is output from the memory circuit. The structure includes an emergency stop circuit that outputs an emergency stop signal that stops the movement of the cloth transfer mechanism, so that the next memory is stored from the time when the signal is output from the photodetector to the detection section at the front in the flap cloth transfer direction. If there is an obstacle whose length is shorter than the distance that the cloth is transferred before the signal is output from the circuit, the cloth transfer mechanism is stopped at the position where the rear end of the obstacle is detected, This prevents the sewing machine from starting, which prevents the pocket hole from being cut in a place other than the intended location on the entire fabric.This not only improves sewing efficiency, but also increases product value. It is possible to obtain a good product, and it also has the effect of eliminating wasted materials.

[Brief Description of the Drawings] Figure 1 is a longitudinal cross-sectional view of the entire device, Figure 2 is a perspective view showing the sewing machine and the clamp section of the cloth transfer mechanism, and Figure 3 is a view of the clamp section of the cloth transfer mechanism and the folding mechanism. Longitudinal cross-sectional view of cooperative action state,
Fig. 4 is a top view of Fig. 3, Fig. 5 is a block diagram of the electrical control device, Fig. 6 is a timing chart, Fig. 7 is a detailed diagram of the light detection control circuit of Fig. 5, and Fig. 8 is a block diagram of the electrical control device. An explanatory diagram showing the relationship between the detection device pupil and the light position pupil detection device, FIG. 9 is a flowchart showing the contents of the block diagram in FIG. 5, and FIG. FIG. 11 is a flowchart based on FIG. 10; FIG. 12 is an explanatory diagram of conventional defects showing the relationship between the light detection device, the sewing point of the sewing machine, and obstacles; FIG. 13 12 is a time chart in FIG. 12, FIG. 14 is a perspective view showing a state in which the sewn fabric, hem fabric and flap fabric have been completely assembled, and FIG. 15 is a top view of FIG. 14. In the figure, 2 is a sewing machine, 3 is a cloth transfer mechanism, 14 is a transfer motor, 45 is a sewing machine motor, 29 is a photodetector,
32 is a detection plate, 34 is a position detection device, 39 is a transfer motor control circuit, 41 is a sewing machine motor control circuit, OP is a first comparison circuit, and OP2 is a second comparison circuit. Figure 3 Figure 4 Figure 1 Figure 2 Figure 5 Figure 6 Figure 8 Figure 9 Figure 15 Figure 7 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14

Claims (1)

[Claims] 1. Fold and hold the trimming fabric in an inverted T-shape on the fabric to be sewn, and overlap and hold the flap fabric that will become the rain cover of the pocket on one of the folded parts of the trimming fabric, and hold it in two predetermined positions. A cloth transfer mechanism 3 that can transfer these cloths along the sewing machine table surface and a cloth transfer mechanism 3 that is placed between the above two positions and performs two parallel sewing machine stitches on both sides of the hemline fabric while transferring the cloth. Sewing machine 2 has two needles for sewing edge decoration fabric and flap fabric onto the fabric to be sewn, and a sewing machine 2 that starts and stops in connection with starting and stopping the sewing machine and sews the fabric to be sewn between the two stitches. and a knife mechanism 6 for cutting a pocket hole parallel to the seam line and the length of the seam line in the hem fabric,
A transfer motor 14 for moving and stopping the cloth transfer mechanism that starts in response to a start signal and stops in response to a stop signal; and a transfer motor 14 for moving and stopping the cloth transfer mechanism that starts in response to a start signal and stops in response to a stop signal; A detection unit 27 that enables
A pair of light emitters and a light receiver are fixedly arranged in front of the sewing machine's sewing point in the cloth transfer direction during sewing, facing the moving path of the detection unit. a photodetector 29 capable of outputting a light receiving signal and a light blocking signal by setting the light detecting device 29 to a light blocking state and a light receiving state;
A memory circuit 38 that can set in advance the amount of movement of the fabric transfer mechanism from the point where the light reception signal is generated until the starting end of the scheduled stitch reaches the sewing machine sewing point, and the amount of movement of the fabric transfer mechanism and the setting amount of the memory circuit. A movement amount detection circuit (CPU) that compares and outputs a matching signal when the two match, and a motor control circuit 41 that starts the sewing machine motor 45 upon receiving the matching signal.
In order to stop the movement of the cloth transfer mechanism when the photoreceptor receives a signal of the light reception state after the cloth transfer mechanism is started and the photoreceptor enters the light shielding state until the cloth transfer mechanism moves a set distance. Emergency stop circuit 4 that can output a stop signal of
3. A safety device for a bead forming device.