JPS58112583A - Playback 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] Technical Field This invention relates to a playback sewing machine that can automatically regenerate a desired number of stitches based on sewing data set in advance by an operator's trial sewing work. .

BACKGROUND ART Conventionally, in this type of playback sewing machine, an operator operates the sewing machine along a desired stitch, and at the end of each stroke of the pattern, performs some manual operation (for example, by pressing a predetermined switch). By performing a suppression operation), sewing data consisting of a stitch count signal for each stroke of the pattern and a code signal for stopping the needle up or down is stored in the storage means attached to the sewing machine. was.

However, the operation is not only complicated and inefficient, but also has the drawback that the operator easily forgets to perform the manual operation.

Purpose The purpose of the present invention is to solve the above-mentioned drawbacks of the conventional playback sewing machine, and to improve the operation performed by the operator during normal sewing, and the pedal operation to stop the sewing machine at the end of one stroke. Alternatively, to provide a playback sewing machine having a function of automatically storing read sewing data in a storage means based on a signal generated in connection with a pedal operation for restarting the sewing machine at the start of the next stroke. It is in.

EXAMPLE Hereinafter, an example embodying the present invention will be described with reference to the drawings.A sewing machine 2 placed on a tilt pull 1 has a main shaft (not shown) mounted on the lower surface of a table 1 and a direct current motor as a driving means. 3 connects belt 4 and pulley (
(not shown), and as the main shaft rotates, the seam forming device is interlocked.

That is, the needle 6 supported by the needle bar 5 is moved up and down by a needle bar mechanism (not shown) built into the sewing machine 2, and is also interlocked with a cloth feeding mechanism (not shown). The needle position detection device 7, which is provided on one side of the sewing machine 2 and serves as a synchronization signal generating means, is composed of a permanent magnet piece that rotates in conjunction with the main shaft and a plurality of Hall elements arranged around the permanent magnet piece. , detects the needle top position, needle bottom position, and thread trimming position of the needle 6, and outputs a pulse signal as a detection signal to a control circuit 23 (described later) in a control box 8 attached to the bottom surface of the needle 1. ing.

A pedal 10 is supported on a support shaft 9 fixed to the leg of the table 1 so that it can be depressed forward (toe side) and backward (heel side), and the pedal 1o is connected to a pedal switch 11 ( (See Figure 3)
are connected via.

A switch 12 is provided protruding from the lower surface of the bracket arm of the sewing machine 2, and is adapted to output a signal to a control circuit 23 based on a pressing operation of the switch 12. An operation panel 13 provided with various operation switches is attached to the upper surface of the bracket arm of the sewing machine 2.

The details will be explained according to FIG. 2. The mode switch 14, which is a holding type snap switch, is set to the normal (NO) mode when the sewing machine 2 is used in normal lockstitch operation.
RMAL) mode and playback (PLAYBACK) that automatically operates based on preset sewing data.
mode and a learning mode for creating sewing data, and an output signal based on the operation is output to the control circuit 23 in the control box 8. Ru. When the mode switch 14 is operated to the learning mode side, the light emitting diode 15 is turned on, and when the mode switch 14 is operated to the playback mode side, the light emitting diode 18 is turned on.

The HALT switch 17, which is a hold-type pushbutton switch, is used as an operation switch to prevent counting data from being transferred to the RAM 24, which will be described later, in the learning mode of the sewing machine 2, and an output signal based on its operation is sent to the control box. The light emitting diode 18 provided above is outputted to the control circuit 23 in the control circuit 8, and when it is in the ON state, the light emitting diode 18 provided above is lit.

The front backtack switch 19 and the end backtack switch 20, which are comprised of holding type snap switches, perform front backtack stitching and end backtack stitching at a preset tack stitching speed based on the sewing take set in the learning mode. The output signal based on the operation is output to the control circuit 23 in the control box 8.

The start indicator light 21 is composed of a light emitting diode, and when automatic operation is performed in the playback mode based on the counting data set in the learning mode, the start indicator light 21 is turned on by the control circuit 23 at the sewing start point of the counting data. 23 is adapted to display that the pedal 10 is in a waiting state for depression operation.

Next, the electric circuit of this sewing machine 2 will be explained according to the block diagram shown in FIG. A control circuit 23 consisting of a processor and a RAM serving as a storage means for storing count data set in the learning mode.
(Random access memory) 24 is provided.

Based on the front depression operation of the pedal 10, the pedal switch 11 outputs a front depression signal unrelated to the depression amount of the pedal 10 and a front depression signal corresponding to the depression amount of the pedal 10 to the control circuit 23, pedal 1
A rear depression signal is output to the control circuit 23 based on the rear depression operation of 0.

When the pedal 10 is depressed forward in the learning mode or normal mode, the control circuit 23 selects a forward depression signal output from the pedal switch 11 according to the amount of depression of the pedal 10, and controls the motor drive circuit based on the signal. Output a signal to 22 and switch sewing machine 2 to pedal 1.
The pedal 10 is operated at a speed according to the amount of depression of 0, and the pedal 10 is outputted from the pedal switch 11 when the pedal 10 is depressed forward in the playback mode.
A pre-depression signal that is unrelated to the amount of depression is selected, and the sewing machine 2 is operated at a preset constant speed based on that signal.

In addition, when the pedal 10 is depressed in the rear in all modes, the control circuit 23 detects the rear depression signal output from the pedal switch 11 and outputs a signal to the solenoid 25 of the thread trimming and thread wiper mechanism. Thread trimming and thread wiping are performed with the needle up and stopped.

Furthermore, when the sewing machine 2 is operated in the learning mode or the playback mode, the control circuit 23 acts as a counting means for counting pulse signals output from the needle position detection device 7, and has a counter therein for counting the pulse signals. A register is provided to store the count data created. As shown in FIG. 4, the register consists of REG1 and REG2 areas for storing the counting data, and a RAM address register for storing the address of RAM 24 for storing the contents of the area, and each area has 8 bits. It consists of

Each address of the RAM 24 can store count data transferred from each register of the registers or eight types of code signals.

The control circuit 23 configured as described above operates when the output signal from the pedal switch 11 is stopped due to release of the pedal 10 in the learning mode, or when a rear press signal is output due to the rear press, or when the switch 12 When the is switched from off to on or from on to off, it acts as a first control means to transfer the counting data stored in the register to the RAM 24, and when the HALT switch 17 is operated at this time, the transfer is stopped. It is designed to act as a transfer blocking means to temporarily block the transfer. Further, when the front depression signal is output from the pedal switch 11 in the playback mode, the control circuit 23 compares the count data obtained by counting the pulse signals from the needle position detection device 7 with the two count data stored in the RAM 24. , acts as a second control means that stops the output signal to the motor drive circuit 22 and stops the DC motor 3 when both stitch number data match.

Further, the control circuit 23 outputs a signal to the solenoid 25 of the cloth feed reversal mechanism in response to the output signal from the switch 12 to reverse the cloth feed direction.

Next, the operation of the sewing machine configured as described above will be explained according to the flowcharts shown in FIGS. 6 and 7.

When the sewing machine 2 performs so-called pocket stitches A to E as shown in FIG. 8, when the sewing machine 2 is first powered on, the control circuit 23 clears all internal registers and RAM 24. Here, in order to create sewing data that can automatically operate pocket stitches A and E, the mode switch 14 is operated to the learning mode side, and the pedal 10 is pressed to operate the sewing machine 2 from point A to point B.
When the pedal 10 is pressed forward, the control circuit 23 determines that the pedal 10 is pressed forward and that the mode switch 14 is operated to the learning mode side, and switches the pedal switch 1 to the learning mode side.
Select the signal output from 1 according to the amount of pre-depression,
Based on the signal, a signal is output to the motor drive circuit 22 to rotate the DC motor 3 at a speed corresponding to the amount of depression of the pedal 10.

As the sewing machine 2 is operating, the control circuit 23 counts the pulse signals output from the needle position detection device 7.
The count data is sequentially stored in the REG1 area in the register. At this time, the count data that cannot be stored in the REG1 area is dealt with by storing the number of overflows in the REG1 area in the REG2 area. The control circuit 23 continues to store the count data in the register unless the switch 12 is operated to turn on or from the on state to the off state.

When the sewing machine 2 reaches point B, the pedal 1o is released from the pedal 1o and placed in the neutral state, and the control circuit 23 stops outputting the signal to the motor drive circuit 22 and starts the sewing machine 2. At the same time, the needle lowering stop code is stored at the address of the RAM 24 corresponding to the number stored in the RAM address register, that is, the first (number 0) address of the RAM 24 corresponding to 0 of the RAM address register which is currently in the clear state. let Next, the control circuit 23 transfers the count data stored in the REG2 area of the register to the next address of the RAM 24, that is, address 1, and stores it, and transfers the count data stored in the REGI area of the register to the RAM 24. After transferring and storing it to the next address, that is, address No. 2, that R
E.G.I.

Clear the REG2 area.

Next, the control circuit 23 determines that the mode switch 14 is in the learning mode according to the flowchart shown in FIG. 7, and then determines whether the HALT switch 17 is in the on state.

Since the HALT switch 17 is currently in the off state, the control circuit 23 waits for the pedal 10 to be depressed after detecting that the HALT1 flag is not set. With the above, RA the sewing data from point A to point B.
The operation of the control circuit 23 to be stored in M24 is completed.

Next, after rotating the workpiece by a predetermined angle in order to memorize the sewing data between B and [ of pocket stitching, the pedal 10 is depressed forward. Determine whether the HALT2 flag is set. Now, the HALT2 flag is set and inactive, and the control circuit 23 next increments the RAM address register by 3, and then
Determine whether the flag is set. and,
When detecting that the HALTI flag is not set, the control circuit 23 detects again that the mode switch 14 is in the learning mode according to the flowchart shown in FIG. The output pulse signals are counted and the counted data is stored in the registers REGI and REG2 in the same manner as above.
Store in area.

When the sewing machine 2 reaches the zero point, the pedal 10 is released from the pedal 10 to be in a neutral state, and the control circuit 23
stops the output signal to the motor drive circuit 22 and starts sewing machine 2.
At the same time, a needle lowering stop code is stored in the address of the RAM 24 corresponding to the number stored in the RAM address register, that is, address No. 8. Next, the control circuit 23 transfers the contents of the registers REG2 and REGl to addresses 4 and 5 of the RAM 24 and stores them, clears the REG2 and REGl areas, and then
According to the flowchart shown in the figure, the system waits for the next pedal operation. This completes the operation of the control circuit 23 to store the sewing data between B and 0 in the RAM 24.

Similarly, when pocket stitching C and D are operated, the function code and count data are stored in each address of the RAM 24, and the operation is similarly carried out from point D to point E, and when the pedal 1o is pressed back on point E, The control circuit 23 stops the needle 6 in the needle up position and outputs a signal to the solenoid 25 to perform thread trimming and thread wiping operations, and then stores the needle up stop code and thread trimming in address No. 9 of the RAM 24 indicated by the RAM address register. and memorize the thread removal code. Continuing,
The control circuit 23 has REG2. After storing the contents of the REG1 area in RAM24 (7) addresses 10 and 11 and clearing the REG2 and REG1 areas,
The system waits for the next pedal operation. All the sewing data for pocket stitches A and E are now stored.

Now, during the learning operation as described above, after the sewing machine 2 is operated by pressing the pedal 10 forward, when the pedal 10 is released from the pedal 10 and the sewing machine 2 is in a neutral state, the control circuit 23 causes the sewing machine 2 to sew the operating part. Take is RAM24
The pocket stitch A shown in Fig. 8 is automatically memorized.
In the learning operation of ~E, A should stop the sewing machine 2.

Next, a case where the sewing machine 2 is stopped by mistake outside each of the fish and shellfishes B, C, D, and E will be described.

Learning 11tJ for pocket sewing A and E shown in Figure 8
], when the sewing machine 2 is operated from point A to point B, if the sewing machine 2 is accidentally stopped at point F, the control circuit 23 changes the data from address 0 to address 2 of RAM 24 as described above. The function code and count data for starting at point A and stopping at point F are stored, and the system waits for the next pedal operation.

When the HALT switch 17 is pressed here, the control circuit 23 switches the HALT switch 1 according to the flowchart shown in FIG.
7 is in the on state and sets the HALT 1 flag in the final address of the RAM 24, lights up the light emitting diode 18 on the operation panel 13, and waits for pedal operation.6 Next, the HALT switch 17
When pressed again to turn off, the control circuit 23 goes to H.
It is determined that the ALT switch 17 is in the off state, the light emitting diode 18 is turned off, and the HALT is stored in the RAM 24.
It is determined that the 1 flag is set and the RAM24
The HALT2 flag is set to the address before the final address of , and the HALTI flag is reset to wait for the next pedal operation.

Here, when the pedal 10 is depressed forward, the control circuit 23
determines that the HALT2 flag is set in the RAM 24, clears the needle lowering stop code at address 0 in the RAM 24, and transfers the count data stored in addresses 1 and 2 to the registers REG2 and REG.
Store in one area. Then, after resetting the HALT2 flag, the operation of 2 is resumed according to FIG. 6, and the pulse signals from the needle position detection device 7 are counted and added to the REG 1 and REG2 areas of the register.

In this way, operate sewing machine 2 to above point B, and press pedal 1.
When the 0 depressing operation is released, the control circuit 23 stops the needle 6 in the lower position, stores the needle lowering stop code in the address 0 of the RAM 24, and stores the code from point A to point B in the addresses 1 and 2 of the RAM 24. Transfer count data from the register and store it.

Sewing take between A and B by the following operations) RA
If stored in M24, A in playback mode.
When performing regenerative operation between .about.B, the operation is not stopped at point F.

Next, a case will be described in which the sewing machine 2 is automatically operated based on such sewing data. First, when the mode switch 14 is switched to the playback mode, the control circuit 23 waits for the pedal 10 to be depressed to start pocket sewing A and E, and the start indicator light 21 on the operation panel 13 lights up. Clear the RAM address register. When the pedal 10 is depressed forward, the control circuit 23 reads out the stored contents of the address of the RAM 24 corresponding to 3N (N=0.1.2...).

Now, since N is 0, the control circuit 23 receives a code signal based on the operation of the switch 12 stored in the first (number 0) address of the RAM 24, and the front backtack switch 19,
The hood signal of the end backtack switch 2o is read out, and a signal is output to the motor drive circuit 22 based on the code signal i to start operation of the sewing machine 2. At this time, since the operation of the sewing machine 2 is controlled by the control a rotation u23, there is no need to keep pressing the pedal 1o.

As the sewing machine 2 operates, the control circuit 23 sequentially counts pulse signals output from the needle position detection device 7 and stores them in the REGI and REG2 areas of the register. Then, sewing machine 2 is operated to point B and its REGI, RE
When the count data in the G2 area and the count takes stored in addresses 2 and 1 of the RAM 24 match, the control circuit 23 determines whether the needle up stop code or the needle down stop code is stored in the address 0 of the RAM 24. Determine whether or not. Since the needle lowering stop code is currently stored at address No. 0 of the RAM 24, the control circuit 23 next determines whether or not a thread trimming and thread removal code is stored at that address. Since the thread trimming and thread removal codes are not currently stored at that address, the control circuit 23 increments N by 1 and registers REG1 and REG1.
After the two areas are cleared, the output signal to the motor drive circuit 22 is stopped according to the flowchart shown in FIG. 7, the sewing machine 2 is stopped, and the sewing machine 2 waits for the next pedal operation. Therefore, when the pedal 10 is depressed forward with the needle 6 positioned above point A, the sewing machine 2 starts operating, and when the needle 6 reaches point B, the control circuit 23 transfers the counting data from the register and the RAM.
When it is detected that the counted take stored in 24 matches, the sewing machine 2 is stopped at the needle down position.

Next, in order to sew between 8 and 0, the workpiece is rotated by a predetermined angle, and when the pedal 10 is depressed forward, the control circuit 23
starts operation according to the flowchart shown in Figure 6,
The pulse signals output from the needle position detection device 7 are counted and stored in the RE (31, l'LEG2 area of the register).Then, the sewing machine 2 is operated to the 0 point and the counting data of that area and number 4 of the RAM 24 are stored. When the count data and the count data stored in address No. 5 match, the control circuit 23
After detecting that the needle lowering stop code is stored at address No. 8 of the RAM 24, and further detecting that the thread trimming and thread wiper codes are not stored at that address,
Increment N by 1 and add REGl, REG
2 area is cleared and the sewing machine 2 is stopped at point C with the needle down and waits for the next pedal operation.

The above operations are repeated to sew between C and D and between D and E. When the needle 6 reaches point E, the control circuit 23
It detects that the needle up stop code is stored at address No. 9 of M24, stops the needle 6 at the needle up position, and then detects that the thread trimming and thread wiping code is stored at that address. , outputs a signal to the solenoid 25 to perform thread cutting and thread sweeping operations. This completes the automatic operation of one pocket stitch A and E, and restarts the start indicator light 2.
1 is lit and the machine waits for pedal operation to perform the next pocket stitches A and E. By repeating the operations in the playback mode as described above, a large number of pocket stitches A and E can be easily sewn.

Next, a case will be described in which front backtack stitches O and J as shown in FIG. 9 are performed using this sewing machine 2.

According to the flowchart shown in FIG. 6, first turn on the power to the sewing machine 2, operate the front backtack switch to turn it on, set the mode switch 14 to learning mode, and position the needle 6 above point G. When the pedal 10 is depressed forward, the control circuit 23 determines that the pedal 10 is depressed forward and that the mode switch 14 is in the learning mode, and selects a signal output from the pedal switch 11 according to the amount of depression of the pedal 10. and outputs a signal to the motor drive circuit 22 based on the signal,
The sewing machine 2 is operated toward point E at a speed corresponding to the amount of depression of the pedal 10.

As the sewing machine 2 is operated, the control circuit 23 counts the pulse signals output from the needle position detection device 7, and stores the counted data' in the REGI and REG2 areas of the register as in the case of pocket stitching. Sewing machine 2 is E
When the switch 12 is pressed and turned on when the engine is driven to the point, the control circuit 23 detects the operation and
The front backtack stitch code and cloth feed reversal are sent to the address of RAM 24 corresponding to the number stored in the R, A M address register, that is, the start (number 0) address of RAM 24 corresponding to 0 of the RAM address register that is currently in the clear state. The code is stored, and the count data between G and H stored in the REO1 and REG2 areas is stored in the 2nd and 1st addresses of the RAM 24, and the REol and REG2 areas are cleared and the RAM address register is incremented by 3. , outputs a signal to the solenoid 25 to reverse the cloth feeding direction.

When the cloth feeding direction is reversed and the sewing machine 2 is operated from point H to point 1, the control circuit 23 counts the pulse signal output from the needle position detection device 7 in the same way as described above, and calculates the count take. REGI.

Store in REG2 area. Then, when the pressing operation of the switch 12 is released when the sewing machine 2 has been operated to the 1st point, the control circuit 23 detects the operation and stores 4 in the RAM 24.
Store the cloth feed normal rotation code in the number address and REOI
, the count data between H and I stored in the REG2 area is R
Store it in addresses 6 and 5 of AM24 and its REG
'1: Clears the REG2 area, increments the RAM address register by 3, stops the output signal to the solenoid 25, and returns the cloth feeding direction to normal rotation.

Similarly, when the sewing machine 2 is operated between points 1 and 5 and the pedal 10 is pressed down after reaching the 1st point, the control circuit 23 causes the sewing machine 2 to stop raising the needle and perform thread trimming and thread sweeping.
The needle up stop code, thread trimming and thread removal codes, and count data between 1 and 5 are stored in the next predetermined address of AM24. With the above steps, sewing data for tacking stitches G to J is created.

Next, a case will be described in which the ε-thin 2 is automatically operated based on such sewing data. First, when the mode switch 14 is switched to the playback mode, the control circuit 23 waits for the pedal 10 to be depressed to start tacking, and the start indicator light 21 on the operation panel 13 is turned on. Clear the RAM address register. Here, when the pedal 10 is depressed forward and a signal is output from the pedal switch 11 to the control circuit 23, the control circuit 23 detects that the front backtack stitch code is stored at address 0 of the RAM 24, A signal is output to the motor drive circuit 22 to start operating the sewing machine 2 at a preset constant speed for tacking. And sewing machine 2
Along with the operation, the control circuit 23 compares the count number of the pulse signal from the needle position detection device 7 with the count data in the RAM 24, as in the case of the pocket sewing regeneration operation. When sewing machine 2 is operated to point H, the count number and R
When the count data of the AM 24 matches, the control circuit 23 detects that the cloth feed reverse code is stored at a predetermined address in the RAM 24, and feeds the cloth. When the needle 6 reaches the 1st point, the control circuit 23 returns the cloth feed direction to the positive direction and continues to operate the sewing machine 2. When the needle 6 reaches the 1st point, the
The needle up stop code, thread trimming and thread wiping code within a predetermined address of 24 are detected, and the needle 6 is stopped in the needle up position and thread trimming and thread wiping operations are performed.

This completes the reproduction operation of one front backtack stitch G, J, and the control circuit 23 turns on the start indicator light 21 and waits for the pedal operation to perform the next front backtack stitch. Further, if the mode switch 14 is switched to the normal mode, the sewing machine 2 can be operated at a speed corresponding to the amount of depression of the pedal 10 after performing the front backtack stitches G to J.

As mentioned above, this sewing machine 2 has the pocket stitch A
, E, after setting the mode switch 14 to the learning mode, press the pedal 10 forward to create sewing data for each stroke A and B.

By driving B, C, C, D, D, and E, and depressing the pedal 10 in the neutral state or afterward at the end points B, C, D, and E of each stroke, the count data corresponding to the number of stitches in each stroke can be obtained. The data can be automatically transferred from the register in the control circuit 23 to a predetermined address in the RAM 24 and stored therein. At this time, if you accidentally stop the sewing machine 2 at B, C, D, or E other than the end point of each stroke, press the HAL T switch 17 to turn it on, press it again to turn it off, and turn off the pedal. By depressing the pedal 10 forward and driving to the next end point, and then depressing the pedal 10 again to the neutral state or backward, accurate counting data that can be sewn in a series without stopping the stroke can be stored in the RAM 24. .

When creating sewing data for tacking stitches G to J, operate the sewing machine 2 by pressing the pedal 10 forward and pressing the switch 12 to reverse the cloth feeding direction at point H. , when the switch 12 is released to return the cloth feed direction to normal rotation at one point, the count takes and cloth feed direction corresponding to the number of stitches of each stroke G~H1H~I, I, J are stored in the RAM 24. can be automatically stored at a predetermined address.

When performing pocket stitches A and E based on the sewing data created by the above-described operation, after setting the mode switch 14 to playback mode, start the stitches at the starting points A, B, C, and D of each stroke. By depressing the pedal 10 forward and outputting a signal to the control circuit 23, the control circuit 23 can automatically sew each stroke at a preset constant speed regardless of the depressing operation of the pedal 10.
When reproducing the tacking stitches G and J, press the pedal 10 forward at the starting point G of the tacking stitches, and the control circuit 23
Accordingly, the tacking stitches G to J can be automatically sewn at a preset constant speed.

Further, in the embodiment described above, when creating sewing takes of pocket stitches A to E, the end point B of each process.

By depressing the pedal 10 in the neutral state or after pressing C, D, and E, the count take corresponding to the number of stitches in each stroke is RA.
I tried to store it in M24, but the end points B and C of each process
, D, E, after putting the pedal 10 in the neutral state, count data for each stroke is RA by front or rear depression operation.
The information may be stored in the M24.

Effects As detailed above, the present invention automatically stores sewing data such as count data created by counting signals from the synchronizing signal generating means in the storage means in response to a drive stop command signal based on pedal operation. Since it is possible to memorize the sewing take of a desired stitch, it is possible to efficiently memorize the sewing take of a desired stitch.

[Brief explanation of the drawing]

Fig. 1 is a front view of a playback sewing machine embodying this invention, Fig. 2 is a front view of its operation panel, Fig. 3 is a block diagram showing its electric circuit, and Fig. 4 is an explanation showing the contents of the register. Figure 5 is an explanatory diagram showing the contents of the RAM, Figure 6 is an explanatory diagram showing the contents of the RAM.
7 and 7 are flowcharts showing the arithmetic processing operations of the control circuit, and FIGS. 8 and 9 are stitch pattern diagrams of this sewing machine. Sewing machine 2, DC motor 3, needle 6, needle position detection device 7, pedal 10. Pedal switch 11, mode switch 14,
HALT switch 17, motor drive circuit 22, control circuit 23, RAM 24, solenoid 25°

Claims (1)

[Claims] 1. A stitch forming device including a needle (6), a pedal (10) provided so as to be operable by an operator to drive and stop the stitch forming device, and the pedal (
drive means (3) for stopping driving of the stitch forming device based on a drive stop command signal from 10); and synchronization signal generating means (7) for generating a signal synchronized with the vertical movement of the needle (6). ), a counting means (23) for counting signals from the synchronization signal generating means (7), and a counting means (23) for counting the signals from the synchronizing signal generating means (7);
storage means (24) arranged to be able to store a plurality of sets of count data counted by the operator (23); a first control means (23) for stopping the drive of the first controller and sequentially transmitting the counting data to the storage means (24) in response to each of the drive stop command signals;
The drive means (3) is driven every time a drive command signal is generated among the drive stop command signals based on the pedal operation of the worker, and the count data stored in the storage means (24) is read from the drive command signal. read out in relation to the occurrence,
a second control means (23) that sequentially compares the read counting data with the counting result of the counting means (23) and stops the driving means (3) based on the comparison result; ．． A playback sewing machine 2 comprising a selection switch (14) operable by an operator to selectively switch the second control means (23). the storage device for the counting data related to the generation of the command signal (
one operation switch (17) that generates a signal to prevent transfer to the count data storage device (24) based on the signal generated in connection with the operation of the switch (17); 2. The playback sewing machine according to claim 1, further comprising transfer blocking means (23) for temporarily blocking transfer to the playback sewing machine. 8 The transfer operation of the count take to the storage device (24) by the first control means (23) is performed after the drive command signal is generated among the drive stop command signals that are continuously generated in connection with pedal operation. The playback sewing machine according to claim 1 or 2, wherein the playback sewing machine is operated in response to generation of a stop command signal. 4 The transfer operation of the count data to the storage device (24) by the first control means (23) is performed after the stop command signal is generated among the drive stop command signals that are continuously generated in connection with pedal operation. The playback sewing machine according to claim 1 or 2, wherein the playback sewing machine is operated in response to generation of a drive command signal.