JPS5946626B2 - Sewing machine control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention detects the rotational speed of a sewing machine and the number of stitches in a certain distance, that is, the number of stitches, every time a timing pulse is generated from a pulse generating means in synchronization with the driving of the sewing machine. Pattern data stored in memory such as a sewing machine that is sequentially stored as data in a storage means such as a computer, or that changes the cloth feed direction of the sewing machine to detect a predetermined number of stitches, such as a reverse stitch sewing machine. The present invention relates to a control device for a sewing machine that reads the information every time a timing pulse is generated and performs sewing in a predetermined pattern.

Conventionally, in this type of sewing machine, a Hall IC detection means or a photoelectric detection means is placed in a part of the sewing machine boot IJ to generate a timing pulse every time the sewing machine main shaft rotates once at a predetermined point. However, for example, after stopping the sewing machine due to a thread breakage, it may be necessary to raise the needle bar to make the thread hole of the needle to an appropriate height for threading, or to replace the needle due to a broken needle. For some reason, if the pulley is manually rotated back and forth in the forward and reverse directions, for example, in a pulse generating means consisting of a permanent magnet provided on the sewing machine pulley and a Hall IC placed on the sewing machine frame, the permanent magnet and Hall IC may By rotating in the forward and reverse directions, timing pulses are generated unnecessarily even when the suturing action is stopped, and various actions are performed by these pulses.

For example, as described above, the rotational speed of the sewing machine and the number of stitches are detected every time a timing pulse is generated in a predetermined suturing action, and stored as data in a storage means such as a microcomputer. In a sewing machine that reproduces the suturing action by changing the rotational speed and number of stitches, if unnecessary timing pulses are generated as described above, unnecessary data will be stored and the suturing action cannot be accurately reproduced. The disadvantage is that it cannot be done.

This invention is based on the above-mentioned accidental invention, and provides a control device for a sewing machine in which a predetermined action means does not operate even if a timing pulse is generated by manually rotating a pulley within a predetermined angular range. The purpose is to obtain.

Embodiments of the present invention will be described below with reference to the drawings.
A sewing machine 1 shown in the figure is a sewing machine equipped with a conventionally well-known cloth presser mechanism, cloth feeding mechanism, and thread cutting mechanism, and when a pedal 2 is depressed forward, a driving motor 4 is driven via a sewing machine control section 3, which will be described later. and motor pulley5. The main shaft of the sewing machine is rotated via a belt 6 and a sewing machine pulley 7, and in this case, as will be described later, the rotational speed of the drive motor 4 increases or decreases in proportion to the amount of depression of the pedal 2, that is, the rotation speed of the sewing machine changes. The rotation speed increases and decreases.

Presser foot 8 of the presser foot mechanism located in the jaw of the sewing machine 1
is raised against the downward elastic force by the operation of an electromagnet (not shown) placed in the sewing machine jaw, and this electromagnet is actuated by the operation of a foot switcher 9 placed on the sewing machine table. The pedal switch is activated by the above-mentioned depression of the pedal 2, and becomes inactive.

In addition, the cloth feeding mechanism (not shown) in the sewing machine bed is controlled so that the cloth feeding direction changes from the forward direction to the reverse direction by the operation of an electromagnet (not shown) placed in the sewing machine bed. It is activated by the suppression operation of the hand switcher 10 disposed in the section, and becomes inoperable by releasing the suppression.

Furthermore, a thread cutting mechanism (
(not shown) is an electromagnet (not shown) that is also placed inside the bed.
(not shown) is activated to cut the sewing thread, and the electromagnet is actuated by stepping the heel of the pedal 2 backwards to activate the thread cutter switch. It is now working.

The sewing machine pulley 7 is provided with a pulse generator 11 having two pulse generators composed of, for example, a Hall IC, a permanent magnet, a light emitting diode, a phototransistor, and a transistor. The -force pulse generator generates a pulse, that is, a bottom detection signal, every time the needle of the sewing machine reaches the bottom dead center, and the other force pulse generator generates a pulse every time the sewing machine needle reaches the top dead center. It is designed to generate a pulse, that is, a lower detection signal, and as shown in Figure 5, the lower detection signal is input to the set input terminal of the flip-flop circuit, and the lower detection signal is input to the reset input terminal. It has become.

A timing pulse generation circuit is connected to the Q output terminal of the flip-flop circuit, and as shown in A in FIG. The timing pulse generating circuit generates a timing pulse by the set output from the Q terminal each time the set state is controlled and the reset state is alternately controlled.

As shown in FIG. 3, a pedal sensor that outputs a variable voltage in proportion to the amount of forward depression of the pedal is connected to the sewing machine pedal 2, and this pedal sensor has a frequency that is proportional to the output voltage. A variable pulse generation circuit is connected.

The pulse generated from this pulse generation circuit is AN
The input pulse is input to the sewing machine control circuit through the D date 1 and the OR gate, and the driving motor 4 is controlled to drive at a rotation speed corresponding to the frequency of the input pulse through the control circuit. It is designed to be input to an 8-bit counter.

The output signal of the count gate signal generation circuit is input to the AND gate 2, and as shown in FIG. AN
A signal is output to open the gate of D gate 2 for a predetermined time period T. Therefore, the pulse from the pulse generation circuit is output from the AND gate 2 only while the gate is open, and the output pulse is digitally converted by a counter. is counted.

The count signal of this counter is input to the input register of a microcomputer-MC equipped with various functions such as various input/output register memories and a memory control circuit including a micro recessor. An input request signal generation circuit is provided between the control circuit and the count gate signal generation circuit.

This input request signal generation circuit outputs an input request signal after the gate signal generation circuit outputs the open signal of the AND gate 2 for one hour, that is, at the same time as the AND gate 2 is closed, and this signal causes the input register to be activated by the counter. It holds the counted up 8-bit digital signal.

As can be seen from the above explanation, the count gate signal generation circuit and the counter constitute a detection means for detecting the rotation speed of the sewing machine, and as the rotation speed of the sewing machine changes, the pulse signal generated by the variable frequency pulse generation circuit is Since the frequency of the pulses generated changes, when the AND gate 2 is opened by the count gate signal generating circuit, the number of pulses output from the gate during the opening time T increases or decreases in proportion to the frequency.

A rotation signal output circuit is connected to the output resistor of the microcomputer-MC, and this rotation signal output circuit includes a counter control circuit and an oscillator, as shown in FIG. It is controlled in accordance with the data value of the digital signal held in the output register by reading data from the oscillator, and outputs pulses oscillated from the oscillator by the number corresponding to the data value every time the pulse is outputted to the gate of AND gate 4. As shown in Figure 8, each time this gate is opened, AND
A rotation pulse is output from the gate 4.

In this case, if the data value of the digital signal corresponds to high-speed rotation of the sewing machine, the number of pulses counted until output is small, that is, the frequency of the rotation pulse becomes high, and the data value corresponds to low-speed rotation of the sewing machine. If so, the counter control circuit is controlled so that the number of pulses counted until the output is large, that is, the pulses of rotational frequency are low.

As shown in FIG. 3, the rotation pulse output from the AND gate 4 is input to the sewing machine control circuit through the AND gate 3 and the OR gate, and the drive motor 4 is driven at a rotation speed corresponding to the frequency. controlled.

The AND gates 1 and 3 are controlled by a contact A-1 which can be closed by pressing the AL switch of the control switch group arranged on the operation panel 12 in FIG. 9 and can be opened by suppressing the ASS snapper. A-
When 1 is closed, AND gate 1 is opened and at the same time A
When ND gate 3 closes and contact A-1 opens, AN
The AND gate 3 is opened at the same time as the D gate 1 is closed.

As shown in FIGS. 2 and 9, the memory control circuit of the microcomputer-MC performs control operations based on signals from the control switch group of the operation panel 12, and controls the AL switch. When the suppression is activated, each time a timing pulse occurs, i.e.
The 8-bit digital signal held in the input register is sequentially stored in the memory by the manual request signal generated each time the main shaft of the sewing machine rotates once, and when the -force As switcher is suppressed, the timing pulse The timing pulse operates to sequentially read out the stored data from the memory and hold it in the output register every time the ASS occurs, and the timing pulse causes the contact A- to be closed by the suppression operation of the ASS stopper and opened by the suppression operation of the AL switch.
2 (see Figure 3).

In addition, as shown in FIG. 2, when a thread trimming signal, a reverse stitching signal, and a presser foot lifting signal are generated through the foot switcher 9, hand switcher 10, and thread trimming switch, they are stored in the memory together with the rotational speed data. 1. Next, the operation will be explained according to the pocket sewing pattern shown in FIG. 10 and the timenayat shown in FIG. 11.

To explain the sewing order of the sewing pattern shown in Fig. 10, operate the pedal 2 appropriately to machine sew 5 stitches in the forward direction from point A to point B at low speed, then sew from point B to point 0 in the same way. Perform reverse stitches for 5 stitches in the reverse direction by rotating at low speed, then perform sewing in the forward direction for 20 stitches by rotating at high speed from point 0 to point D. After stopping the sewing machine, turn the fabric 90 degrees counterclockwise. Turn the machine and sew at high speed again for 20 stitches in the forward direction from point D to point E, stop the sewing machine, and then sew the fabric counterclockwise for 90 stitches.
The sewing machine rotates once and performs machine stitching in the forward direction for 20 stitches from point E to point F by rotating at high speed.

Then, after reverse sewing 5 stitches in the reverse direction from point F to point G by rotating at low speed, sewing in the forward direction by 5 stitches from point G to point E by rotating at low speed, and then pressing the pedal 2.
Step the heel backwards to cut the thread and stop the sewing machine at the same time.

In this case, from point B to point 0 and from point F to point G, the hand switcher 10 is suppressed to reverse the cloth feeding direction from the forward direction to the reverse direction, and at points D and E, the cloth is rotated. The foot switcher 9 is operated to raise the presser foot 8.

The electromagnet for raising the presser foot 8 is activated by another control circuit (not shown) at the same time as the sewing machine is stopped.

Therefore, if the AL switcher of the control switch group of the operation panel 12 is operated in a suppressing manner prior to the sewing machine sewing, the contact A-1 is closed, and therefore, the AND gate 3 is closed at the same time as the AND gate 1 is opened.
In this state, when the pedal 2 is operated for sewing with the sewing machine, a pulse generated from the variable frequency pulse generation circuit corresponding to the amount of pedal depression is input to the sewing machine control circuit via the AND gate 1 and the OR gate. As described above, the drive motor 4 is driven or stopped at a speed corresponding to the frequency of the pulses, and during this sewing operation, the hand switch 10. The sewing pattern shown in FIG. 10 can be formed by operating the foot stitcher 9 and the thread trimming switch and turning the cloth appropriately.

On the other hand, during this machine sewing, the pulses generated from the variable frequency pulse generation circuit are connected to the AND gate 2 as described above.
Each time a timing pulse is generated via a counter, it is exchanged into an 8-bit digital signal and held as rotational speed data in the input register of the microcomputer-MC, and an input request generated in connection with the timing pulse is The signal causes the memory control circuit to sequentially store the digital signals held in the register in the memory, and also causes the hand switch 10. When the foot switch 9 and the thread trimming switch are activated, their signals are also stored in the memory at the same time.

Next, when the AS switch of the control switch group is suppressed and the contact A-1 is opened, AND gate 1 is closed and AND gate 3 is opened at the same time. When the presser foot 8 is lowered and the start switch located on the operation panel 12 is activated, the signal is input to the memory control circuit, and the first digital signal stored in the memory is read out and sent to the output register. As mentioned above, a rotation pulse with a frequency corresponding to the data arrival of the digital signal is outputted and inputted to the sewing machine control rotation via the AND gate 3 and the OR gate, and the drive motor 4 adjusts the frequency of the rotation pulse. At the same time, the timing pulse generated by the drive is sequentially input to the memory control circuit via the contact A-2, and the signals below the digital signal are sequentially read out. The drive motor 4 is sequentially driven and controlled at a rotational speed corresponding to the data value according to the storage order of the stored digital signals.
As shown in FIG. 1, when signals corresponding to stopping the driving motor 4 are read out at points D and E, the driving motor 4 is controlled to stop at points D and E, respectively.

In this case, by operating the start switch, each signal from point D to point E and from point E to point H will be read out sequentially by the same action as described above, and at points D and E, The presser foot lifting signal stored in is read out and the presser foot 8 is raised, and from point B to point 0 and from point F to point G, the reverse stitching signal is read out and the cloth feeding direction is controlled in the opposite direction. Immediately before the H point, the thread trimming signal is read out and the sewing thread is cut by the new thread trimming mechanism.

Therefore, at the above-mentioned point and the stopping point of point E, turn the cloth 90 degrees counterclockwise, activate the pedal switch to lower the rising presser foot 8, and then activate the start switch. For example, the sewing pattern shown in FIG. 10 can be accurately reproduced.

During the above-mentioned sewing operation, the sewing machine 1 may be stopped due to an accident such as thread breakage or needle breakage, or other circumstances, and the needle bar may be moved to the top dead center in order to perform various operations such as threading or replacing the needle. Even if the sewing machine pulley 7 is turned by hand due to the necessity of No pulses are generated.

That is, even if the pulley 7 is rotated within a range in which one of the detection signals is not generated, as shown in B in FIG. During this manual turning operation, unnecessary data is not stored in the memory, nor is stored data read out at an unnecessary time.

Furthermore, in the above embodiment, the rotational speed is detected every time a timing pulse occurs, that is, every time the main shaft of the sewing machine rotates once, and is sequentially stored as data in the memory. However, the rotational speed of the sewing machine It may be possible to store it in the memory every time the value changes.

That is, as shown in FIG. 12,! When the first rotational speed data detected by the rotational speed detection means of the sewing machine shown in FIG. , held in input register B, and the second signal detected by the occurrence of the next timing pulse.
When the second data is input to register A, the subtraction circuit subtracts the data value of that data from the data value of the first data held in manual register B, and then the comparator circuit applies the subtracted value to the digital switch in advance. The second data is stored in the memory and held in the input register B only when the subtracted value is larger than the set data value when the second data is compared with the set data value.

Then, when the third data is input, if the second data is held in input register B, the respective data values of the second and third data are subtracted and compared as described above. If the first data is still held in input register B, subtract and compare each data value of the first third data, and as above, if the subtracted value is larger than the set value set in the digital switch. The third data is stored in memory only in input register B.
Then, each time a timing pulse is generated, the data to be sequentially input to the manual register A is recorded in the memory while sequentially subtracting and comparing the data in the above-mentioned relationship.

Therefore, if the data value set in the digital switch is, for example, a data value corresponding to the sewing machine's rotation speed of 20 Orpm, then the rotation of the data held in input register B (i.e., the most recently stored data in memory) If there is a difference of 20 Orpm or more between the speed and the rotational speed of data newly input to input register A, the new data is stored in memory and held in input register B.

In this case, instead of setting the above setting data using a digital switch, the ROM of the microcomputer-MC
It is also possible to write the following information in advance.

In addition to the above data, the memory stores the number of stitches when new data is stored as data.

This is done by counting the timing pulses using a counter included in the microcomputer MC (not shown).

This stitch number data and the rotational speed data are stored in the memory in the manner shown in FIG. 13.

This memory has a capacity of 8 bits per word, and is designed to store 3 words as one data unit.
The reverse stitch signal is stored in the bit, the presser foot lifting signal is stored in the 5th bit, and the 0th, 1st, and 2nd bits of the 1st word and all 8 bits of the 2nd word, totaling 11 bits, contain the stitch count data. is stored, and the rotational speed data is stored in the 8th focus of the third word.

In addition, if there is a change in at least one of the thread trimming signal, reverse stitching signal, presser foot lifting signal, and rotational speed data, and a storage command is issued from the memory control circuit, the data unit will be processed as described above even if there is no change in other signals or data. Therefore, for example, if there is a command to store a reverse stitch signal, the third word of that data unit will be the same as the third word of the previous data unit even if the rotational speed data does not change. The data will be stored.

Therefore, as shown in the first embodiment, the storage mode in the memory according to the sewing shown in FIG. 10 and the timenayat shown in FIG. 11 is as shown in FIG. 14.

In this case, the low speed rotation shown in Figure 11 is approximately 50 rpm.
, the high speed rotation is approximately 200 Orpm, and the setting data for comparison by the comparison circuit is 200 rpm.
Set the digital switch as Orpm.

First, by starting to drive the sewing machine with low speed rotation, low speed data is stored in the third word as sewing machine rotation speed data at point A, and at point B of the fifth stitch, the sewing machine 1
0, the reverse stitch signal is stored in the 4th bit of the 4th word, the data for the 5th stitch is stored in the 5th word as the number of stitches, and the low speed data is subsequently stored in the 6th word.

When the 10th stitch C point is reached, the reverse stitch operation is canceled and the data with the above reverse stitch signal erased is stored in the 7th word.
The 8th word stores data for the 10th stitch as the number of stitches, and the 9th word stores high-speed data as sewing machine rotation speed data.

When the 30th stitch D point is reached, the sewing machine is stopped by releasing the pedal 2 and the foot switcher 9 is activated, so that the presser foot lifting signal is sent to the 5th bit of the 10th word, and the 30th stitch data is sent to the 11th word as the number of stitches. Sewing machine stop data is stored in the 12th word.

Then, at point D, when pedal 2 is depressed and the sewing machine is driven again by high-speed rotation (the presser foot is lowered by the pedal switcher activated by the pedal depression), the 13th
The data in which the presser foot lifting signal is erased in the word is the first
The 4th word also records the data for the 30th stitch as the number of stitches1.
The 15th word stores high-speed rotation data.

When the 50th stitch E point is reached, the presser foot lift signal is sent again to the 5th bit of the 16th word and the number of stitches is 50 to the 17th word.
The sewing machine stop data is stored in the 18th word, and by re-driving the sewing machine at this point E, the stitch data is stored in the 18th word.
The 9th word stores data in which the presser foot lifting signal is deleted, the 20th word stores the 50th stitch data, and the 21st word stores high-speed rotation data.

When the 70th stitch F point is reached, the sewing machine is operated at low speed and the handle switch 10 is activated.
The reverse stitch signal is in the bit, and the number of stitches is 7 in the 23rd word.
The 0th stitch data is stored in the 24th word, and the low speed rotation data is stored in the 24th word.

Then, at point G of the 75th stitch, when the operation of the handle switch 10 is released, the 25th word contains the data with the reverse stitch signal turned off, and the 26th word contains the data of the 75th stitch as the number of stitches.ζ27th word Low speed rotation data is stored in , and at the final H point, the thread trimming signal is stored in the 3rd bit of the 28th word by actuation of the thread trimming switch by stepping the heel of the pedal 2 backward, and the thread trimming signal is stored in the 3rd bit of the 28th word. The data for the 80th stitch is the number of stitches, and the data for the 30th stitch is
Sewing machine stop data is stored in each word, and a reset signal for resetting the address count is stored in the 7th bit of the 28th word in relation to this thread trimming signal.

The reading operation of each data stored in this way is as follows.

As described above, by actuation of the start switch, each data from the first word to the third word is read out and held in the output registers associated with each word up to the fourth stitch, and the sewing machine starts driving at a low speed.

At the 5th stitch, each data from the 4th word to the 6th word is read out and held in the output register, the sewing machine continues to operate at low speed, the cloth feed direction is reversed to constant reverse force, and reverse stitching is performed, and the 10th stitch is Then, each data from the seventh word to the ninth word is read out and held in the output register, and the sewing machine is driven at high speed at the same time as the cloth feeding direction is reversed to the positive direction.

At the 30th stitch, each data from the 10th word to the 12th word is read out and held in the output register, and at the same time as the sewing machine stops, the presser foot 8 is raised.

Then, when the fabric is turned 90 degrees counterclockwise and the start switch is activated again, each data from the 13th word to the 15th word is read out and held in the output register, and the sewing machine starts at the same time as the presser foot 8 descends. The sewing machine is driven at high speed, and when the 50th stitch is reached, the sewing machine stops again according to each data from the 167th to the 18th word, the presser foot 8 is raised, and the fabric is similarly rotated 90 degrees counterclockwise and the start switch is pressed. is activated, the presser foot 8 is lowered again according to the data from the 19th word to the 21st word, and the sewing machine is driven at high speed.
At the 70th stitch, the sewing machine is driven at a low speed based on the data from the 22nd to 24th words, and the cloth feeding direction is reversed. At the 75th stitch, the sewing machine is driven at a low speed based on the data from the 25th to 27th words. The cloth feed direction is reversed to the positive direction while being driven at low speed, and reverse stitching is performed. At the 80th stitch, thread trimming is performed according to each data from the 28th word to the 30th word, and the sewing machine stops.

As a result, the stitch shown in Fig. 10 was reproduced correctly, and in the first practical row, 80 words of rotational speed data were stored as rotation speed data in order to perform 80 stitches like the above stitch. In this second embodiment, it is only necessary to store 10 words of data as rotational speed data.

In addition, as in this second embodiment, the subtraction value subtracted by the subtraction circuit is compared with a preset value set in a digital switch, etc., and new data is stored in the memory only when the subtraction value is large. However, if the subtraction value becomes a value other than 0 as a result of a change in circuit speed, new data may be written in the memory regardless of the magnitude of the value.

As described above, this invention provides two pulse generating means that alternately generate pulses every time the main shaft of the sewing machine rotates half a rotation. A flip-flop circuit is connected to these pulse generating means so as to be reset when a pulse is generated, and a third pulse generating means is provided which further generates a pulse by a set output or a reset output from this flip-flop circuit. Since the predetermined action means performs a predetermined action in connection with the generation of pulses from the third pulse generation means, the third pulse does not occur unless pulses are generated alternately from the first and second pulse generation means. Since no pulse is generated from the threading/soil means, for example, in order to set the thread hole of the needle to an appropriate height for threading after stopping the sewing machine due to occurrence of thread breakage,
Or, in order to adjust the needle bar to an appropriate height in order to change the needle due to a broken needle, or for other reasons, by rotating the pulley back and forth by hand in the forward and reverse directions, for example, the permanent magnet installed on the sewing machine pulley and the sewing machine frame. In the pulse generating means composed of the arranged Hall ICs, the permanent magnets and the Hall ICs are repeatedly opposed to each other by rotating the pulley in the forward and reverse directions, so that the permanent magnets and the Hall ICs are connected from one of the first and second pulse generating means. Even if a pulse is generated, the third pulse generating means does not generate a pulse, so that the above-mentioned operating means has no chance of performing any action, and malfunctions and unnecessary actions of the operating means can be prevented. In addition to being excellent in safety, it is possible to obtain effects such as being excellent in economy by preventing incorrect fabrication of sewn products.

[Brief explanation of the drawing]

FIG. 1 is a front view of the sewing machine, FIG. 2 is an overall block diagram of the above-mentioned reproduction control circuit, and FIG. 3 is a block diagram centered on the rotational speed detection circuit of the sewing machine and the storage control circuit for the detected speed data. Fig. 4 is a time chart of the action of each part constituting the sewing machine rotational speed detection circuit of Fig. 3, Fig. 5 is a block diagram of the timing pulse generation circuit, and Fig. 6 shows the action of each part of the timing pulse generation circuit. Fig. 7 is a block diagram of the output circuit, Fig. 8 is a time chart showing the operation of each part in Fig. 7, Fig. 9 is a front view of the operation panel, and Fig. 10 shows the order of pocket sewing. Explanatory diagram, 1st
Fig. 1 is a time chart showing the action of each mechanical part of the sewing machine during the sewing shown in Fig. 10; Fig. 12 is a block diagram of the memory reproduction side circuit showing another embodiment; Fig. 13 is the memory in Fig. 12; Explanatory diagram showing the data storage mode, No. 14
The figure is an explanatory diagram showing the contents of data stored in the memory.

Claims (1)

[Claims] 1. A first pulse generating means that generates a pulse every time the sewing machine main shaft rotates once, and a second pulse generating means that generates a pulse approximately half a rotation of the sewing machine main shaft after the pulse generation from the first pulse generating means; a flip-flop circuit whose input section is connected to the second and second pulse generating means so as to be set by a pulse from the pulse generating means of the other source and reset by a pulse from the external pulse generating means; and a set of the flip-flop circuit. a third pulse generating means connected to the output part of the flip-flop circuit so as to generate a timing pulse by the output or reset output; and a third pulse generating means connected to the output part of the flip-flop circuit so as to generate a timing pulse by counting a predetermined number of timing pulses from the third pulse generating means or every time a timing pulse is generated. A control device for a sewing machine, comprising operating means connected to a third pulse generating means to perform a predetermined action.