JPS6025980B2 - Sewing machine motor start/stop device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a starting/stopping device for a sewing machine motor, and more particularly, to a sewing machine motor start/stop device, which is equipped with a pattern selection switch for selecting a desired stitch pattern from among a variety of predetermined stitch patterns. This invention relates to an improvement of a starting/stopping device for a sewing machine motor in a sewing machine.

When selecting a new stitch pattern on a conventional sewing machine, the operator usually first stops the sewing machine motor by operating the manual operation switch that controls starting and stopping of the sewing machine motor, and then presses the pattern selection switch. The user selects a desired stitch pattern by operating the sewing machine, and then operates the manual operation switch again to start operating the sewing machine motor and sew a new stitch pattern onto the workpiece cloth. The sewing machine motor was conspired to perform such operations.
If you operate the pattern selection switch while driving in the evening, not only will the desired stitch pattern not be formed during the operation, but depending on the type of sewing machine, there is a risk that the sewing needle may collide with the throat plate and break. There is. Furthermore, it is well known that tacking is performed at the beginning and end of forming a stitch pattern to prevent the stitch pattern from unraveling. To finish forming a stitch pattern on a conventional sewing machine, press and operate the tacking switch for tacking while the stitch pattern is being formed, and stitch the predetermined stitch for tacking to that stitch. The above-mentioned manual operation switch is manually operated in order to form a sewing machine continuously with the pattern, finish the tacking operation by releasing the pressing operation of the tacking switch, and stop the sewing machine motor at the same time as the pressing operation is released. However, since the sewing machine motor is in operation when the pressing operation of the tacking switch is released, unless the manual operation switch is operated quickly, the stitch pattern will be formed again after the tacking operation is completed. For this reason, extra seams are formed on the processed fabric when the seam pattern is finished forming.
It becomes impossible to sew beautiful seam patterns on the processed cloth. The present invention has been made in view of the above-mentioned problems, and the pattern selection switch and the tacking switch are connected to the drive control circuit of the sewing machine motor, so that when the pattern selection switch is manually operated or the tacking switch is pressed, By configuring the sewing machine so that when the operation is released, the power supply to the sewing machine motor is cut off and the sewing machine motor is automatically stopped, the operation of the sewing machine becomes easier and the pattern selection of the conventional sewing machine is simplified. It is an object of the present invention to provide a starting/stopping device for a sewing machine motor that completely eliminates operational risks during operation and can simplify the configuration for obtaining such an effect.

Hereinafter, a first embodiment of the present invention will be described with reference to FIG. 1.

Reference numeral 1 denotes a starting switch (corresponding to the switch means of the present invention) which is maintained through a resistor 2 in series between the positive terminal +VCC and the light terminal, and when pressed manually, both of its contacts close. When the contact is opened and the pressure is released, the contact is returned to closed.

Therefore, each time the starting switch 1 is pressed and released, a set pulse P, which rises when the contacts are opened and falls when the contacts are closed, is output from the anti-zero potential terminal side contact of the starting switch 1. Ru. 3 is a rising trigger type trigger flip-flop which is a generating means, and its clock input terminal T receives the set pulse P.3 generated when the start switch 1 is pressed. is connected to receive as input.

This trigger flip-flop 3 operates as follows every time the set pulse P input to its clock input terminal T rises.
In other words, the first state is triggered every time the start switch 1 is pressed and a start command signal "H" consisting of a high level signal is generated from the output terminal Q, and the first state is made up of a low level signal from the output terminal Q. The second one that generated the stop command signal “L”
The configuration is such that the setting is held in either state.
The trigger flip-flop 3 is cleared synchronously when a rising signal is applied to its clear terminal CL via the line L, and when the power to the sewing machine is turned on, and when cleared, the output It operates so that the output from terminal Q becomes the stop command signal "L". Reference numeral 4 denotes a control circuit as a control means consisting of a switching transistor 5 and a relay 6. The base of the transistor 5 is connected to the output terminal Q of the trigger flip-flop 3 via a resistor 7, and the emitter is connected to the drop potential terminal. The collector is connected to the positive power terminal +VCC via the excitation coil 6a of the relay 6.

Therefore, in the control circuit 4, when the start command signal "H" is output from the output terminal Q of the trigger flip-flop 3, the transistor 5 is turned on, the normally open switch 6b of the relay 6 is closed, and the trigger flip-flop is turned on. When the stop command signal "L" is output from the output terminal Q of the relay 3, the transistor 5 is turned off and the normally open switch 6b of the relay 6 is opened. 8 is an AC power supply, and both output terminals are connected to the induction coil 9.
and a noise prevention filter 11 consisting of a capacitor 10 and a capacitor 10.
are followed by busbars 12 and 13, respectively.

Between the busbars 12 and 13, there is a series circuit of a sewing machine motor 15, for example, a series-wound commutator motor, which is operatively connected to the anode and cathode of a thyristor 14 for phase control and to the main shaft of the sewing machine (not shown), and A voltage dividing circuit 21 consisting of a polar diode 16 and a series circuit of resistors 17, 18, 19, and 20 is connected, respectively. A parallel circuit consisting of a resistor 22 and a capacitor 23 is connected between the gate and cathode of the thyristor 14, and a varistor 24 for protecting the thyristor 14 is connected in parallel with the anode and cathode of the thyristor 14. ，
A capacitor 25 is connected in parallel with the series circuits 19 and 20. 26 is a changeover switch for changing the rotational speed of the sewing machine motor 15 to one of "high speed", "medium speed J" and "low speed", and the high speed contact 1, the medium speed contact M and the low speed contact L are set respectively. It is connected to a predetermined voltage tap in the voltage dividing circuit 21, and the movable contact C is connected to a normally closed switch 27b of the tacking switch 27, which will be described later, and the relay 6.
The thyristor 14 is connected to the gate of the thyristor 14 through a normally open switch in series. The total stop switch 27 is
It has a normally open switch 27a that is manually pressed, and a normally closed switch 27b and a normally open switch 27c that are respectively linked to the pressed operation of the normally closed switch 27a, and the series circuit of the normally closed switch 27a and the resistor 28 is It is connected between the positive power supply terminal +VCC and the old voltage terminal. Therefore, each time the tacking switch 27 is pressed and released, the tacking selection pulse P2, which is a tacking selection signal, rises when the normally closed switch 27a is opened and falls when the normally open switch 27a is closed. It is output from the anti-zero potential terminal side contact. Further, the normally open switch 27c is connected between the gate of the thyristor 14 and the low speed contact L of the changeover switch 26, thereby forming a gate circuit 29 which is a tacking operation means. Therefore, this gate circuit 29 disables the operation of the control circuit 4 during the pressing operation period of the tacking stitch selection switch 27 (in other words, during the generation period of the tacking stitch selection pulse P2), and causes the sewing machine motor 15 to operate at a low speed. It operates to supply power via the rear point L, and after the pressing operation of the tacking stitch selection switch 27 is released (in other words, after the tacking stitch selection pulse P2 stops generating).
It functions to enable the operation of the control circuit 4. 30
is a pattern selection switch having the same structure as the starting switch 1 for selecting a desired stitch pattern from among a variety of predetermined stitch patterns; A detection circuit 31 serving as a detection means is constructed by connecting a resistor 64 in series with the resistor 64.

That is, each time the pattern selection switch 30 is pressed and released, the detection circuit 31 sends a selection detection pulse P3, which is a selection detection signal, which rises when both contacts of the pattern selection switch 30 are opened and falls when the saddle point is closed, to the pattern selection switch. It is output from the contact on the anti-zero potential terminal side of No. 30. 32 is an OR circuit (corresponding to the response means of the present invention) connected to receive the tacking stitch selection pulse P2 and the selection detection pulse P3 as inputs respectively, and its output terminal is connected to the line L. It is connected to the clear terminal CL of the trigger flip-flop 3 via the trigger flip-flop 3.

Therefore, the OR circuit 32 sets the trigger flip-flop 3 to the second state (stop command signal "L") in response to the selection detection pulse P3 or the tacking selection pulse P2, regardless of the start switch 1. function to forcibly maintain the settings (in the state in which they occurred). Reference numeral 33 denotes a pattern forming control device which controls the lateral swing movement of the sewing needle and the feed movement of the work cloth in the pattern sewing machine, and will be described below.

34 is a monostable multipiper connected to receive the selection detection pulse P3 from the detection circuit 31 as an input, and is triggered at the falling edge of the pulse P3; 35 is the output of this monostable multipiper 34 connected to line L3. e.g. 3 connected to receive as counting input via
This is a bit-structured pattern counter, and the eight types of counted contents from "000" to "111" of this pattern counter 35 are respectively used as pattern selection codes corresponding to each of the eight types of stitch patterns such as direct stitches and zigzag stitches. Output.

36 is a timing pulse generator that generates a timing pulse in synchronization with the vertical reciprocating motion of the sewing needle as the sewing machine motor 15 rotates; specifically, the sewing needle moves from the needle upper layer above the sewing machine bed surface to the lower layer of the sewing machine bed surface. A timing pulse SP is generated that rises a predetermined time after the timing when the sewing needle is displaced from the needle lower layer to the needle upper layer, and falls after a predetermined time after the timing when the sewing needle is displaced directly from the needle lower layer to the needle upper layer.

37 is connected to receive the timing pulse SP from the timing pulse generator 36 as an input via the inverter 38, and is triggered when the signal from the inverter 38 falls, in other words, when the timing pulse SP rises. A monostable multi-pipelator 39 that generates the feed timing pulse FCP is connected to receive the feed timing pulse FCP from the monostable multi-piper 37 as a count input, and outputs the count contents as an address code, for example, a 4-bit This is the number of stitches in the composition.

Reference numeral 40 denotes a semiconductor memory device in which amplitude information for determining the drop position of the sewing needle and controlling the horizontal swinging motion of the sewing needle in order to form each of the eight types of stitch patterns is stored in the order in which the stitches are formed. The eight types of amplitude information groups and the feed information paired with the amplitude information that determines the feed amount of the work cloth and controls the feed movement in order to form each of the eight types of stitch patterns are This is to obtain eight types of sending information groups stored in the order of formation.

This semiconductor memory device 40 has a pattern counter 35.
The pattern selection code from the stitch number counter 39 and the address code from the stitch number counter 39 are connected so that they are supplied separately, and the pattern selection code 'thus selects a pair of amplitude information and feed information group, and at the same time selects the pattern selection code'. The addresses of each information group are sequentially specified by the address code, and a pair of vibration information and sending information stored in each address is sequentially outputted via line groups LA and LB, respectively. 4
Reference numeral 1 denotes a multi-input AND circuit which is connected to receive outputs from the line group LA as inputs separately, and whose output terminal is connected to one input terminal of the OR circuit 42 .

The other input terminal of the OR circuit 42 is connected to the OR circuit 32.
connected to receive the output from via line L,
Its output terminal is connected to the clear terminal CL of the stitch count counter 39. In addition, in the eight types of amplitude information groups stored in the semiconductor memory device 40, the termination code "1111J" is stored at the next address where each final information is stored, and therefore corresponds to the selected amplitude information group. When one stitch formation is completed and the termination code is output via the line group LA, this is applied to the clear terminal CL of the stitch number counter 39 via the AND circuit 41 and the OR circuit 42. The count of the stitch number counter 39 is cleared to "0000" each time the formation of one stitch pattern is completed. 43 is a pulsed needle-up signal NUP that becomes low level when the sewing needle is at a predetermined position above the sewing machine bed surface.
It is a needle-mounted detector that generates 44 is an AND circuit, one input terminal of which receives the needle-up signal NU from the needle-up detector 43.
P via an inverter 45, and the other input terminal is connected to the output terminal of the monostable multipipulator 34 via a line L3, so that the AND circuit 44 receives the needle up signal NUP. The signal from the monostable multipipulator 34 is allowed to pass only while it is being output.

46 is an OR circuit, both input terminals of which are connected to the AND circuit 4.
4 and the output terminal of a monostable multipipulator 47 which is connected to generate an amplitude timing pulse BCP triggered at the falling edge of the timing pulse SP from the timing generator 36, respectively.

48 is an AND circuit, one input terminal of which is connected to the output terminal of the OR circuit 46, and the other input terminal of which connects the tacking selection pulse R2 to the line L2 and the inverter 4.
Therefore, the AND circuit 48 allows the signal from the OR circuit 46 to pass only while the stop ridge selection pulse P2 is not output.

Reference numeral 50 denotes a latch connected to receive amplitude information outputted from the semiconductor storage device 40 via the line group LA, and whose clock input terminal CK is connected to the output terminal of the AND circuit 48 via a delay circuit 51. It is connected.

When the above-mentioned latch 5 is in the state where the tacking selection pulse P2 is not output, the needle up signal N is output from the needle up detector 43.
When the pattern selection switch 30 is pressed while UP is being output, the output or amplitude timing pulse BCP of the monostable multipipulator 34 passing through the AND circuit 44 is the output of the amplitude timing pulse BCP. Amplitude information read from the semiconductor memory device 40 at the time it is applied to the input terminal CK is stored. 52 is an AND circuit, one input terminal of which receives the timing pulse S from the timing pulse generator 36.
P, and the other input terminal is connected to the output terminal of the monostable multipipulator 34, so that the AND circuit 52 receives the timing pulse SP.
The monostable multipipulator 34 is activated only while the
Allows signals from to pass through.

53 is an OR circuit, both input terminals of which are connected to the AND circuit 5.
2 and the output terminal of the monostable multipipulator 37, respectively.

Reference numeral 54 denotes a latch connected to receive as input the sending information outputted from the semiconductor memory device 40 via the line group LB, and its clock input terminal CK is connected to the OR circuit 5.
The delay circuit 55 is connected to the output terminal of the delay circuit 53 to the output terminal of 3.
connected via.

The latch 54 is connected to the output of the monostable multipiper 34 or the sending timing pulse which passes through the AND circuit 52 when the pattern selection switch 30 is pressed while the timing pulse SP is being output from the timing pulse generator 36. The sending information read from the semiconductor memory device 40 at the time when the FCP is applied to the clock input terminal CK is stored. The amplitude information stored in the latch 5 as described above is converted into an analog signal by the DA converter 56, and this is supplied to the amplitude control actuator 58 via the amplitude control driver 57. This amplitude control actuator 58 controls the lateral swinging operation of the sewing needle regarding the formation of one stitch in order to swing the sewing needle in the lateral direction with an amplitude corresponding to the amplitude information stored in the above-mentioned latch 50. do. On the other hand, the feed information stored in the latch 54 is supplied to the DA converter 601 via the multiplexer 59, converted into an analog signal by the DA converter 60, and then sent to the feed control driver 61. The voltage is supplied to the feed control actuator 62 via the voltage. This feed control actuator 62 controls the feed movement of the feed dog regarding the formation of one stitch in order to impart a feed movement to the workpiece cloth with a feed amount corresponding to the feed information stored in the latch 54 described above. One stitch pattern is determined by a round counting operation of the stitch number counter 39 until all the information in the corresponding pair of amplitude information groups and feed information group is read out. By repeating this cycle, the same type of stitch pattern is continuously formed. Reference numeral 63 denotes an auxiliary storage device that stores tacking feed information for providing a unique feeding base to the workpiece cloth when tacking stitches are performed to form a tacking stitch different from the above-mentioned stitch pattern; A multiplexer 59 connected to receive feed information for the tacking stitch as input from the latch 54.
is connected to output to.

The select terminal SL of the multiplexer 59 is connected to receive the tacking selection pulse P2 outputted when the tacking switch 27 is pressed via the line L2, and the tacking selection pulse P2 is transmitted to the selection terminal SL. S
In the state where the tacking stitch selection pulse P2 is applied to the sect terminal SL, the tacking stitch feed information from the auxiliary storage device 63 is supplied to the DA converter 60, and in the state where the tacking stitch selection pulse P2 is not applied to the sect terminal SL, the tacking stitch feed information is supplied from the latch 54. The configuration is such that the sending information is sent to the D-A converter 60. Next, the operation of the above configuration will be explained.

Prior to starting the operation of the sewing machine, the sewing machine is powered on, and the operator operates the cut-off switch 26 according to the worker's wishes, for example, so that the movable contact C-high speed contact 2 is in the closed state, and then the pattern selection switch 30 It is assumed that the operator selects a stitch pattern according to his/her wishes by operating , and then presses the start switch 1. Then, the trigger flip-flop 3, which is cleared when the power is turned on, is triggered at the rise of the set pulse P, which is generated when the start switch 1 is pressed, and the start command signal "H" is output from its output terminal Q, so that the switching transistor 5 is turned on, and the normally open switch 6b of the relay 6 is closed. As a result, a relatively large divided voltage due to the series circuit of resistors 18, 19, and 20 in the voltage dividing circuit 21 is applied to the contact of the changeover switch 26 (C
1) to the gate of the thyristor 14 through the normally closed switch 27b and the normally open switch 6b, so that the thyristor 14 starts the phase control operation with its firing conduction angle relatively large, and the sewing machine motor 15 receives a relatively large power V supply and rotates at high speed. On the other hand, in the pattern formation control diamond counterfeit 33, the pattern selection code corresponding to the stitch pattern selected by the operation of the pattern selection switch 30 is output from the pattern counter 35.
A pair of amplitude information groups and feed information groups corresponding to the stitch pattern in 0 are selected, and the addresses of each selected information group are sequentially designated by the address code from the stitch number counter 39, and each address is The stored pair of amplitude information and sending information are sequentially output via line groups LA and LB, respectively. Then, the amplitude timing pulse BCP is output from the monostable multipipulator 47 at the falling edge of the timing pulse SP from the timing pulse generator 36.
is applied to the clock input terminal CK of the latch 50 via the OR circuit 46, the AND circuit 48, and the delay circuit 51, the amplitude information output to the line group LA is newly stored in the latch 50 and validated. . Furthermore, at the rising edge of the timing pulse SP, the monostable multipipulator 37
When the feed timing pulse FCP output from the line group LB is applied to the clock terminal CK of the latch 54 via the OR circuit 53 and the delay circuit 55, the feed information output to the line group LB is newly stored in the latch 54 and becomes valid. be converted into Each piece of information in the pair of information groups validated in this way is supplied to the D-A converters 56 and 60, respectively, as described above,
A desired stitch pattern selected by the pattern selection switch 30' is formed on the work cloth. Now, when the pattern selection switch 30 is pressed to form a new stitch pattern during the stitch pattern forming operation as described above, a selection detection pulse P3 is output from the detection circuit 31, which is sent to the OR circuit 32 and the line L. is supplied to the clear terminal CL of the trigger flip-flop 3 via the trigger flip-flop 3.

Then, when the selection detection pulse P3 rises, the trigger flip-flop 3 activates the pattern selection switch 3.
0 is pressed and the two contacts are opened, the signal is cleared, and the stop command signal "L" is output from the output terminal Q to which the start command signal "H" had been output until then. As a result, the switching transistor 5 is turned off, the excitation coil 6a of the relay 6 is disconnected, and the normally open switch 6b of the yield relay 6 is restored and opened, so that the thyristor 14 is no longer given its gate potential and performs phase control operation. Then, the operation of the sewing machine motor 5 is stopped. On the other hand, in the pattern counter 35, the count progresses based on the output from the monostable multipipelator 34 triggered by the rise of the selection detection pulse P3, and the pattern selection code that is the customer in the count is determined according to the operator's wishes. It is determined by the number of times the corresponding pattern selection switch 30 is pressed. After that, when the start switch 1 is pressed, the trigger flip-flop 3 is triggered by the set pulse P generated at the time of the press operation, and a start command signal is sent from its output terminal Q.
H'' is outputted again, and thereafter, as described above, the switching transistor 5 is turned on and the sewing machine motor 15 starts operating, and a newly selected stitch pattern is formed by the pattern forming control device 33. In addition, during the above-mentioned stitch pattern formation, the fixing stitch switch 2 is used to perform the fixing stitch so that the stitch pattern does not come undone when the stitch pattern is finished forming.
When 7 is pressed, the tacking selection pulse P2 is output from the anti-zero potential terminal side contact of the normally closed switch 27a while the tacking switch 27 is being pressed, and at the same time, the normally closed switch 27b is opened. and normally closed switch 27c
is closed.

As a result, a relatively small divided voltage generated by two resistors in the voltage dividing circuit 21 is applied to the gate of the thyristor 14 via the normally open switch 27c forming a part of the gate circuit 29, so that the thyristor 14 is activated. The phase control operation is started in a state where the conduction angle is relatively small, and the sewing machine motor 15 receives the start command signal "H" from the trigger flip-flop 3.
” and the stop command signal “L”, the trigger flip-flop 3 is supplied with a relatively small amount of power and is rotated at a low speed regardless of the stop command signal “L”, and the trigger flip-flop 3 sends the tacking selection pulse P2 to its clear terminal CL through the OR circuit 32 and the line. It is supplied via LI and cleared, and outputs the stop command signal "LJ" from its output terminal Q. Therefore, the normally open switch 6 of the relay 6
b is opened in response to the pressing operation of the tacking switch 27. On the other hand, during the period in which the tacking selection pulse P2 is being output, the tacking selection pulse P2 is output to the inverter 4.
Since the amplitude timing pulse BCP from the monostable multipipulator 47 cannot pass through the AND circuit 48, the latch 5 is applied to one input terminal of the AND circuit 48 through the latch 5. 40 without reading new amplitude information from the fixing stitch switch 27.
holds the memory contents at the time of the pressing operation, and the dropping position of the sewing needle is determined according to the memory contents. Also, during the period in which the tacking total selection pulse P2 is being output, the tacking selection pulse P2 is applied to the select terminal SL of the multiplexer 59, so that the feed information from the latch 54 is invalidated and at the same time the auxiliary The feed information for tacking stitches in the storage device 63 is validated, so that even if the dropping position of the sewing needle determined as described above and the feed amount of the workpiece fabric is determined by the feed information for tacking stitches, A predetermined tacking stitch is performed at the end of the stitch pattern that has been formed up to this point. When the pressing operation of the tacking stitch switch 27 is then released, the normally closed contacts 27a and 27b are closed and the normally open contact 27c is opened, and at the same time, the tacking stitch selection pulse P2 disappears. At this time, as described above, since the normally open contact 6b of the relay 6 is in the open state, no firing signal is applied to the gate of the thyristor 14, and the sewing machine motor 5 is stopped. The same applies to the case where the tacking is performed at the start of forming the stitch pattern. In this case, after the tacking is finished, the start switch 1 is pressed to start the sewing machine motor 15, and the desired sewing is carried out. Once the formation of a stitch pattern is started, a predetermined tacking stitch is performed at the leading edge of the stitch pattern. As mentioned above, the above device is
When selecting a new stitch pattern while the sewing machine motor 15 is operating, the operation of the sewing machine motor 15 is automatically stopped in conjunction with the stitch pattern selection operation by the pattern selection switch 3. This completely eliminates the danger of breaking the sewing needle caused by accidentally operating the pattern selection switch while the sewing machine motor is running, and the disadvantage that the desired stitch pattern will not be formed during the operation. It can be resolved.

In addition, when the above-mentioned device performs tacking to prevent stitches from unraveling at the start and end of forming a stitch pattern, the device receives a start command signal from the trigger flip-flop 3 while the tacking switch 27 is pressed. "H" and stop command signal "L"
”, the sewing machine motor 15 can be operated to perform locking stitches regardless of the condition of As a result, there is no need to manually operate the manual operation switch to stop the sewing machine motor at the same time as the tacking work is completed, and it reliably prevents unnecessary stitches from being formed on the workpiece fabric when the stitch pattern is finished forming. This makes it possible to sew beautiful seam patterns onto the processed fabric. Moreover, when selecting a new stitch and performing tacking stitches as described above, the present invention has the advantage that the respective operations are significantly simpler than in the case of a secondary stitch. Additionally, sewing machines are usually equipped with a motor drive circuit that has a function to stop the sewing machine motor.
This device, which uses such a drive circuit (in this embodiment, the control circuit 4, thyristor 14, etc.) to directly cut off the power to the sewing machine motor 15, significantly changes the mechanism of the sewing machine. Therefore, by directly stopping the sewing machine motor 15 in connection with the operation of the pattern selection switch 30, a clutch mechanism or the like is not required, and the overall configuration can be simplified. Next, a second embodiment of the present invention will be described with reference to FIG.

FIG. 2 shows only the parts different from the first embodiment and the parts related thereto. Reference numeral 65 designates eight pattern selection switches, each corresponding to eight types of stitch patterns, and closed only while applying pressure with fingers; one end of each switch is connected to a zero potential terminal, and the other end is connected to a zero potential terminal. A detection circuit 67 is connected to each input terminal of the encoder 66 and serves as a detection means together with the encoder 66.

The encoder 66 assumes decimal numbers 0, 1, ..., 7 for each pattern selection switch 65, and when any one of the pattern selection switches 65 is closed. At times, the decimal code assumed for this is converted into a pattern selection code in the binary code state, and each bit is outputted via line LC, and at the same time, the selection is sent to a separately provided line group L4 as a selection detection signal. This configuration outputs a detection pulse P4. Reference numeral 68 denotes a latch having a 3-bit configuration, for example, which is connected to receive the pattern selection code from the encoder 66 as input via the line group LC, and whose clock input terminal CK receives the selection detection pulse P4 from the detection circuit 67 as input. It is connected to the output terminal of a monostable multipipulator 34 which is connected to receive the signal.

The latch 68 stores the pattern selection code from the encoder 66 when the signal from the monostable multipipulator 34 is applied to its clock input terminal CK, and at the same time outputs this pattern selection code to the semiconductor storage device 40'. Then, as in the first embodiment, a pair of amplitude information groups and sending information groups in the semiconductor memory device 40 are selected based on the pattern code. Further, the selection detection pulse P4 from the encoder 66 is connected to be supplied to one input terminal of the OR circuit 32. In this embodiment configured in this manner, when the pattern selection switch 65 is pressed, the selection detection pulse P4 outputted from the encoder 66 in response
is the OR circuit 32 and the line L. is applied to the clear terminal CL of the trigger flip-flop 3 through the trigger flip-flop 3, thereby stopping the operation of the sewing machine motor 15 as described above, and the same effect as in the previous embodiment can be obtained. As is clear from the above description, according to the present invention, the operation of using a sewing machine is simplified, and the operational risks associated with pattern selection operations of conventional sewing machines are completely eliminated, and such effects can be achieved. It is possible to provide a starting/stopping device for a sewing machine motor whose configuration can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the electrical configuration of the first embodiment of the present invention, and FIG. 2 is a diagram showing the electrical configuration of the second embodiment, focusing on the parts that are different from FIG. 1. In the figure, 1 is a start switch (switch means), 3 is a trigger flip-flop (generating means), 4 is a control circuit (control means), 14 is a thyristor, 15 is a sewing machine motor, 26
is a cut-off switch, 27 is a tacking switch, 29 is a gate circuit (tacking stitch actuation means), 30 and 65 are pattern selection switches, 31 and 67 are detection circuits (detection means), 32 is an OR circuit (response means), Reference numeral 33 indicates a pattern formation control device, and reference numeral 40 indicates a semiconductor memory device. Figure 2 Sphere

Claims (1)

[Claims] 1. A pattern selection switch is provided for selecting a desired stitch pattern from among a variety of predetermined stitch patterns, and the stitch pattern is selected according to manual operation of the pattern selection switch by an operator. In a sewing machine that forms a desired seam pattern on a processed cloth,
a manually operable switch means for starting and stopping a sewing machine motor operatively connected to the sewing machine main shaft; and generating a selection detection signal when the pattern selection switch is manually operated to change a stitch pattern. a detection means, and holding the setting in accordance with a manual operation of the switch means in either a first state in which a start command signal is generated for the sewing machine motor or a second state in which a stop command signal is generated in the sewing machine motor. response means for forcibly setting and holding the generating means in the second state in response to the selection detection signal regardless of manual operation of the switching means; and a starting command from the generating means. A starting/stopping device for a sewing machine motor, comprising a control means for controlling supply and cutoff of electric power to the sewing machine motor according to a signal and a stop command signal. 2. The patent characterized in that the generating means is composed of a trigger flip-flop, the trigger input terminal of which is connected to the switch means, and the clear terminal of which is supplied with the selection detection signal via the response means. A starting/stopping device for a sewing machine motor according to claim 1. 3
Equipped with a pattern selection switch for selecting a desired stitch pattern from among a variety of predetermined stitch patterns, the desired stitch pattern selected according to manual operation of the pattern selection switch by the operator is processed. In a sewing machine for forming fabric, a manually operable switch means is provided to start and stop a sewing machine motor operatively connected to a sewing machine main shaft, and a pattern selection switch is manually operated to change a stitch pattern. detecting means for generating a selection detection signal when the sewing machine motor is in a first state for generating a start command signal and a second state for generating a stop command signal for the sewing machine motor; generating means that can be set and held according to manual operation; and a locking stitch that can be pressed to form a predetermined locking stitch different from the stitch pattern selected by operating the pattern selection switch. a switch, means for generating a tacking stitch selection signal when the tacking stitch switch is pressed, and said generating means in response to said selection detection signal or said tacking stitch selection signal regardless of manual operation of said switch means. a response means for forcibly setting and maintaining the sewing machine motor in the second state; a control means controlling supply and cutoff of electric power to the sewing machine motor according to a start command signal and a stop command signal from the generating means; a stop actuated to disable the operation of the control means and supply power to the sewing machine motor during generation of the tie stitch selection signal, and enable operation of the control means after generation of the tie stitch selection signal ceases; A starting/stopping device for a sewing machine motor, which comprises a sewing operation means.