JPS602072B2 - Sewing machine seam adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention converts digital stitch signals sequentially read out from a storage device into analog stitch signals corresponding to the stitch signals, and operates an operation in response to the analog stitch signals. In a sewing machine that uses a device to control the relative position of a sewing needle and a workpiece cloth to automatically form a predetermined seam pattern on the workpiece cloth, the magnitude of an analog stitch signal input to the actuator is controlled. The present invention relates to a seam adjustment device for adjustment.

Conventionally, in a sewing machine that automatically forms a stitch pattern as described above, the magnitude of an analog stitch signal input to an actuating device is determined by a transmission device (for example, The transmission rate was determined by the constant transmission rate of the amplifier (amplifier and voltage divider), which was preset to be suitable for standard sewing operations. For this purpose, the shape and size of the seam pattern to be formed on the processed cloth are determined by the sewing work conditions.
For example, it cannot be changed depending on the thickness of the work cloth, the sewing location, etc., and the types of sewing work that the worker can perform are limited. Therefore, the present invention has been made in view of the above-mentioned drawbacks, and the transmission rate is adjusted according to the manual operation of the operator in order to obtain the amount of lateral swing of the sewing needle and the amount of feed of the work cloth suitable for special sewing operations. To provide a stitch adjustment device that enables a wide variety of sewing operations by providing a variable transmission rate transmission device and switching between the variable transmission rate transmission device and the constant transmission rate transmission device according to an operator's selection operation. The purpose is to

An embodiment of the present invention will be described below with reference to the drawings.

1G is a machine frame of a sewing machine that can selectively form a predetermined variety of stitch patterns, for example, one type of flea stitch pattern. A long display board 4 is arranged on the left and right side walls, and a display board 4 is provided with figures 5 each representing the seam pattern of the above-mentioned flea.
are drawn adjacent to each other in the longitudinal direction, and a large number of light emitting diodes 6 are arranged above each figure 5 so as to correspond to each other.

Reference numerals 7 and 8 designate first and second operation members for selecting a stitch pattern, which are provided on the right side of the display panel 4 on the front side of the upper lid 3.

Reference numeral 9 denotes a sewing needle that moves vertically and reciprocally on the main shaft of the sewing machine (not shown), and is oscillated in the lateral direction and whose oscillation amplitude is also controlled by an amplitude control actuator 0 shown in FIG.

11' is a presser foot provided behind the sewing needle 9 via a presser bar 12 so as to be able to reciprocate up and down.

Reference numeral 13 denotes a feed device, for example, a feed dog, which imparts a feed motion to the work cloth in synchronization with the up and down reciprocating movement of the sewing needle 9, and the feed direction and feed amount of the work cloth are controlled by a feed control actuator 14 shown in FIG. It has become so.

Reference numeral 15 denotes an operation switch for starting and stopping the movement of the sewing machine, which is provided on the left side of the front side of the sewing machine arm 2.

Reference numeral 16 denotes a storage chamber provided in a portion of the machine frame 1, for example, on the upper surface of the sewing machine arm 2, and is positioned so as to face an operating opening 17 formed in the upper cover 3.

Reference numeral 18 denotes a plywood section that faces the operation opening 17 from below and is integrally formed with the top cover 3, and has a horizontally long rectangular shape and has a flange section 19a (see Fig. 4) at the lower end of the inner circumference. A closing portion 19 is provided.

20' is an operation instruction plate provided on the flange portion 19a in a teaching state so as to close the opening 19; "Tune", "Amplitude", "Feed (backward)", "Feed (forward)"
and the symbol ``10 HA 1st class'' are drawn on it.

Reference numerals 21 and 22 denote printed circuit boards on which a large number of electronic components and the like are arranged, and these are connected to a boss portion 2 protruding from the lower surface of the upper cover 3, with a spacer 23 interposed between them.
4 via screws 25.

26 is a thread tension potentiometer for adjusting the thread clamping pressure of the thread tension disc in the thread tension device; 27 is an amplitude potentiometer which is a manual adjuster for adjusting the amount of lateral rocking of the sewing needle 9; and 28 is a work cloth. A backward potentiometer 29 is a manual adjuster for adjusting the backward feed amount, and a forward potentiometer 29 is a manual adjuster for adjusting the forward feed amount of the work cloth. Each of these potentiometers 26 to 29 is connected to the printer board. 21 is attached and fixed at the base, and each of the operation knobs 26a to 29a penetrates the operation instruction plate 20 and projects upward,
Each of the operation knobs 26a to 29a is set to the above-mentioned "thread tension", "amplitude", "feed (reverse)" and "feed (reverse)" on the top surface of the operation instruction plate 20.
``Forward)''.

30G is an opening/closing lid that is rotatably provided on the operating gate 7 to open and close it, and is given an upward rotational force by a torsion coil spring 31.

Reference numeral 32 designates an engaging portion that is integrally provided on the right hand corner of the lower surface of the opening/closing lid 30 and has an engaging groove 32a (see FIG. 4) on the right side thereof, and is operated by the opening/closing lid 301. Opening section 1
7 is in a closed state, it is inserted into a through hole 33 bored on the right side of the front side of the plywood section 18.

34 is a boss portion integrally provided on the lower surface of the upper lid 3, and 35 is a support member fixed to the boss portion 34 by screws or the like. The overall shape of this support member 35 is shown in FIG. There is.

Reference numeral 36 denotes a support shaft whose one end is inserted through and fixed through the through hole 371 of the support section 35, and whose other end is provided with a washer 38. Member 39
The through hole 40 is loosely inserted, and the engaging member 39 is connected to the support shaft 3.
It is rotatably provided about 6 as a fulcrum.

Reference numeral 41 designates a torsion coil spring which is also loosely inserted into the support shaft 36, and its respective tips are pressed into the engagement piece 42 of the engagement portion village 39 and the groove portion 43 of the support member 35, so that the engagement member 39
It gives an upward rotational force to the.

The distal end of the arm 44 of the engagement member 39 is connected to the support member 3.
The guide groove 45 of No. 5 is fitted with iron so as to be movable up and down, thereby restricting upward rotation of the subassembly member 39. 4
Reference numeral 6 denotes a push nail that is inserted from below into the through hole 47 of the support member 35 and protrudes upward through the upper cover 3, and is prevented from coming off upward by a large diameter portion 48 provided integrally with this push nail. There is.

Since the slit Z 49 provided in the large diameter portion 48 is iron-fitted to the intermediate portion of the engagement member 39, the push button 46
When the engaging member 39 is pushed up, the engaging member 39 rotates downward against the spring force of the torsion coil spring 41. However, in the above configuration, the opening/closing lid 30 is connected to the torsion coil spring 3.
The opening/closing lid 30 is manually operated downward in order to close the operating opening 17 from the state where the operating opening □ 17 is opened in the upright state as shown in FIG. When the opening/closing lid 30 is rotated, the engaging portion 32 of the opening/closing lid 30 engages the inclined surface 32b (see FIG. 4, 2) formed on the engaging member 39.
It is inserted into the transparent part 33 while being slid onto the inclined surface 42a formed on the engagement piece 42. As a result, the engaging member 3
9 is rotated downward against the spring force of the torsion coil spring 41, and then the engagement groove 32a of the engagement portion 32 and the engagement piece 42
2 match, the engaging portion village 39 is rotated upward by the spring force of the torsion coil spring 41 to engage the engaging groove 32.
a and the engaging piece 42 are engaged, and the operation opening 17 is closed from the opening/closing lid 301 and this state is maintained. In addition, when the push pin 46 is pressed down with a finger or the like in the above state, the engaging member 3
9 is rotated downward, the engagement groove 32a and the engagement piece 42
When the engagement with the opening/closing lid 30 is released, the torsion coil spring 3
The opening/closing lid 30 is rotated upward by the spring force of 1, and the operating gate 17 is opened, and at the same time, the opening/closing lid 30 is placed in an upright state. Now, the upper part of the fifth river is an actuator that penetrates the plywood part 18 and protrudes upward, and the lower part thereof is the support member 3.
A compression coil spring 52 is inserted loosely into the through hole 51 of No. 5 so as to be vertically movable, and a compression coil spring 52 is stretched between the collar portion 50a protruding from the outer periphery of the intermediate portion and the support portion 35, and the coil is always A spring 52 urges the collar portion 50a to an upper position supported by the lower surface of the plywood portion 18. This actuator 50 is pressed and moved downward by a pressing portion 53 protruding from the lower surface of the opening/closing lid 30, and therefore moves up and down as the opening/closing lid 30 is opened/closed. Reference numeral 54 denotes a microswitch arranged on the printed circuit board 21, and this is provided so that its actuating bushing piece 54a is pressed and released in accordance with the vertical movement of the actuator 50, and thus the opening/closing lid is closed. 3
It is set to 0 so that it is turned on when the opening/closing lid 30 is closed, and is turned on when the opening/closing lid 30 is closed.

Next, the configuration of an electrical control circuit for controlling the lateral swing movement of the sewing needle 9 and the feeding movement of the feed dog 13 will be described.

In FIG. 9, reference numeral 55 denotes an operating circuit, and a first interlocking switch 56 consisting of a normally open switch element 56a and a normally closed switch element 56b interlocked with the operation of the first operating member 7.
and a second motion switch 57 that is interlocked with the operation of the second operating member 8 and includes a normally open switch element 57a and a normally open switch element 57b. 58 is a code signal 0 generation circuit, which includes a pulse generator 59 that generates a low frequency pulse SP of about 2 to 5 Hz, and a pulse generator 59 that generates a numerical code signal that gradually increases and decreases.
A selection counter 60 consisting of a Hayabusa reversible counter and outputting the counted contents as a pattern selection code corresponding to the seam pattern of the above-mentioned 1 mirror flea, AND circuits 61, 62 and an OR circuit 63 forming a pulse distribution circuit. Consisting of

The output pulse SP of the pulse generator 59 is output from the AND circuit 6
1 and 62, and the other input terminal of the AND circuit 61 receives potential through a parallel circuit of the normally closed switch element 56b and the normally open switch element 57a. connected to the terminal and also the AND circuit 6
The other input terminal of No. 2 is connected to the fog level terminal through a parallel circuit of the normally open switch element 56a and the normally open switch element 57b5. The output terminals of the AND circuits 61 and 62 are connected to the addition input terminal UT and the subtraction input terminal DT of the selection counter 60, respectively, and to the input terminals of the OR circuit 63. The above operation circuit 055
In the code signal generation circuit 58, when the first operating member 7 is pressed down, the normally open switch element 56a of the first interlocking switch 56 is opened and the normally closed switch element 56b is opened.
is opened, one input terminal of the AND circuit 61 is released from zero potential by the opening of the normally closed switch element 56b and becomes a high level, and the AND circuit 61 continues to press the first operating member 7. The output pulse SP of the pulse generator 59 is allowed to pass only for a period of time. On the other hand, the AND circuit 62 is cut off because one of its input terminals receives zero potential via the normally open switch element 57b of the second interlocking switch 57, so the selection counter 60 is The output pulse SP that has passed through the circuit 61 is received at the addition input terminal UT, and its rising edge is counted, and the counted contents are gradually increased.In response, when the second operating member 8 is pressed, the above-mentioned case occurs. On the contrary, the AND circuit 62 allows the output pulse SP to pass only while the pressing operation of the second operation section 8 is continued, and the selection counter 60 receives the output pulse SP that has passed through the AND circuit 62. SP is received at the subtraction input terminal DT to gradually decrease the counted contents.Then, although not shown, the selection pattern indicating circuit including the plurality of light emitting diodes 6 selects the pattern that is counted in the selection counter 68. The selected pattern indicating circuit is provided to receive a code as an input, and the selected pattern indicating circuit selects one of the light emitting diodes 6 corresponding to the shape 5 representing the seam pattern of the one line type according to the inputted pattern selection code. That is, for example, when the first operating member 7 is pressed, the number of pattern selection coats counted by the selection counter 60 gradually increases while the pressing operation continues, as described above. ``As a result, each light emitting diode column 6 is sequentially illuminated in the leftward direction in FIG. 1 or 2, and each corresponding figure 5 is sequentially optically indicated. When the shape 5 corresponding to the desired stitch pattern is optically designated by visually changing the indicated state of the shape 5, the pressing operation of the first operating member 7 is released and the first interlocking switch is activated. If 66 is restored, the 6 AND circuits are cut off and the output pulse SP is prevented from passing.
The count content at this time is 0. The selected pattern designation circuit holds a pattern selection code corresponding to the desired stitch pattern, and sets one of the light emitting diodes 6 corresponding to the count content to a continuous lighting state. do. As described above, the pattern selection code corresponding to the desired stitch pattern is displayed at the selection counter 6Q.
will be output from. Note that when the second operation section 8 is pressed, each light emitting diode 6 is sequentially turned on in the rightward direction. 64 is a semiconductor memory device which stores amplitude information for determining the needle drop position and controlling the lateral oscillating movement of the sewing needle 95 in order to form each stitch pattern of the one mirror class. A group of amplitude information (digital stitch signals) for one type of stitches stored in the order of stitch formation in a digitized state, and a feeding amount of the work cloth to form each stitch pattern of the same type mentioned above. A group of feed information for a one-wheeled heavy load (digital stitch signal) in which the feed information paired with the amplitude information that is determined and controlled to control the feed motion of the feed dog 13 is digitized and stored in the order of stitch formation. Then, stitch formation is performed with the thread tension information corresponding to the pair of amplitude information and feed information data for controlling the thread tension by adjusting the holding pressure of the thread tension disc in the thread tension device being digitized. This is to obtain a group of thread tension information for one mirror flea stored in sequence.
This semiconductor storage device 64G also has a selection counter 6.
A pair of amplitude information groups and feed information groups and a thread tension information group corresponding to these are selected and made effective according to the pattern selection code N. It is configured to be 6
Reference numeral 5 denotes a sewing machine synchronizing pulse generator that generates sewing machine synchronizing pulses in synchronization with the up and down reciprocating movement of the sewing needle 9, and supplies the sewing machine synchronizing pulses to monostable multipipelators 66 and 67 directly or via an inverter 68. are connected like this.

The monostable multi-pipelator 66 is triggered in synchronization with the falling edge of the sewing machine synchronization pulse and outputs an amplitude timing pulse P.
The feed timing pulse P2 is triggered in synchronization with the rising edge of the sewing machine synchronization pulse and is advanced in phase from the amplitude timing pulse PI. 691 is a stitch number counter connected to receive the feed timing pulse P2 from the monostable multipipelator 87 as a counting force, and its reset terminal RT is connected to the output terminal of the OR circuit 63. And this stitch number counter 6
9 is supplied to the semiconductor memory device 4, and the amplitude information group and feed information group corresponding to the one type of stitch pattern validated by the pattern selection code W are supplied. In addition, each piece of information in the thread tension information group is synchronized with the counting operation of the stitch number counter 69 to line group LA and line group L.
B and line group LC, respectively. 7
01, the amplitude information from the semiconductor memory device 64 is transferred to line group L.
A latch connected to receive the amplitude timing pulse PI as a latch signal through the clock input terminal CK reads and stores the amplitude information at the time when the latch receives the amplitude timing pulse PI as a latch signal through the clock input terminal CK, and at the same time, the stored contents are transferred to the latch D-. Output to A converter 71 (conversion device).

The DA converter 71 is configured to convert amplitude information received as input into an analog stitch signal, for example, a DC voltage E, of an amount corresponding to the code content, and output the signal Z. Furthermore, the 10th
11 shows an example of a specific circuit configuration of a part of FIG. 9, including the latch 70 and the D-A converter 71.
This will be explained with reference to the figure. That is, 72 is a first transmission circuit for receiving the DC voltage E from the Z-A converter 71 and transmitting it at a preset constant transmission rate suitable for standard sewing work. Specifically, as shown in FIG. 10, a voltage dividing resistor 73 is connected in series between an output terminal 71b of a D-A converter 71 equipped with an amplifier 71a and a zero potential terminal. , 74, 75, and a constant divided voltage E, . is connected to one fixed contact A of an analog switch 76, which will be described later. 77 is a second transmission circuit (second transmission device) for receiving the DC voltage E from the D-A converter 71 and transmitting it at a variable transmission rate; specifically, as shown in FIG. As shown in , it consists of the amplitude potentiometer 27 connected between the output terminal 71b of the D-A converter 71 and the drop potential terminal, and the variable divided voltage E,2 obtained at this sliding terminal is connected to the analog switch. 7
It is connected to the other fixed point M of 6.

Reference numeral 78 denotes a switching circuit which is a switching device that connects either one of the first and second transmission circuits 72 and 77 to the positive input terminal of the comparator 79 to enable it. , a signal generation terminal ST configured to continuously output, for example, a high level signal when the microswitch 54 is in the off state, and to continuously output, for example, a low level signal when the microswitch 54 is in the on state;
and the analog switch 76.

However, this analog switch 76 actually consists of a non-contact switch, but for convenience of explanation, it is represented by the symbol of an Isonaki-style sliding door switch.
0 is closed and a high level signal is output from the signal generation terminal ST, in response to this, the contact C and A are turned on,
The structure is such that when the opening/closing lid 30 is opened and a low level signal is output, the contacts C and M are turned on. Therefore, in the switching circuit 78, when the opening/closing lid 30 is in the closed state, the microswitch 54 is turned off, so a high level signal is output from the signal generation terminal ST, and the contact point C-A of the analog switch 76 is output. The switch is turned on and the first transmission circuit 72 is activated, and the opening/closing lid 30 is activated.
Since the microswitch 54 is on when the analog switch 76 is open, the contact C- of the analog switch 76 is turned on.
The second transmission circuit 6 is activated by turning on the second transmission circuit 6. The comparator 79, which forms part of the actuating device 80 for causing the sewing needle 9 to swing in the lateral direction, receives the DC voltage E from the D-A converter 71 at its positive input terminal. The signal is applied via either the transmission circuit 72 or the second transmission circuit 77 and the switching circuit 78. 81 detects the actual lateral swing position of the sewing needle 9 and converts it into a position signal such as a DC voltage E2 via an amplifier 81a.
This is a potentiometer that outputs as .

Reference numeral 82 denotes a synthesis circuit connected to receive the DC voltage E2 from the potentiometer 81 at its positive input terminal, and the DC voltage E2 from the potentiometer 81 at its negative input terminal via the differentiating circuit 83. The input signals are combined and used as the feedback voltage E3 to the comparator 79.
It is designed to be supplied to the negative input terminal of.

Then, the comparator 79 receives the supplied divided voltages E, . Or E
, 2 and the feedback voltage E3, the difference voltage is amplified by an amplitude control driver 84 and supplied to the amplitude control actuator 101. Specifically, the amplitude control driver 84 has a well-known circuit configuration as shown in FIG. The excitation coil 10a of the amplitude control actuator 10 is energized from either one. A latch 85 is connected to receive the sending information from the semiconductor memory device 64 as an input via the line group LB, and the latch 85 receives the sending timing pulse P2 as a latch signal at its clock input terminal CK via the delay circuit 86. At the same time, the above-mentioned sending information is read and stored, and the stored contents are transferred to D-
Output to A converter 87 (conversion device).

The DA converter 87 is configured to convert the feed information received as input into an analog stitch signal, for example, a DC voltage E4, of an amount corresponding to the code content, and output the signal. 88'maD-
This is a third transmission circuit (first transmission device) for receiving the DC voltage E4 from the A converter 87 and transmitting it at a constant transmission rate, and specifically, as shown in FIG. Output terminal 87b of the DA converter 87 equipped with an amplifier 87a
and voltage dividing resistors 89 and 90 connected in series between the zero potential terminals.
9 and 91, and is connected so as to apply a constant divided voltage E4 obtained on the anti-zero potential terminal side of the voltage dividing resistor 91 to one fixed contact A of an analog switch 92 having the same configuration as the analog switch 76 described above. ing.

93 is a fourth transmission circuit (second transmission device) for receiving the DC voltage E4 from the D-A converter 87 and transmitting it at a variable transmission rate; As shown in , the D-A converter is? The reverse potentiometer 28 is connected in parallel between the output terminal 87b and the zero potential terminal.
and a forward potentiometer 29 and an analog switch 34 connected so that variable divided voltages E and E43 obtained at the respective sliding terminals of each potentiometer 28 and 29 are applied to fixed points F and 8, respectively. It consists of “
A movable contact C of the analog switch 94 is connected to the other fixed acid point M of the analog switch 92.

The analog switch 94 receives the signal of the least significant bit of the sending information outputted to the line group LB as an input via the line 95 to perform a switching operation, and when a high level signal is input, the low point is switched. The configuration is such that the contact between C and B is turned on, and when a low level signal is input, the contact between C and F is turned on. Incidentally, the feed amount of the work cloth when forming a stitch pattern is determined by the content of the feed information corresponding to the stitch pattern, but the feed direction of the work cloth is determined by the least significant bit of the feed information. If the lower bit is a logic value "IJ" which is a high level signal, the work cloth is sent in the backward direction, and if the lower bit is a logic value "0" which is a low level signal, the work cloth is sent in the forward direction. Therefore, the analog switch 94 activates either the backward potentiometer 28 or the forward potentiometer 29 according to the content of the sending information output to the line group LB. This is a switching circuit which is a switching bag layer that connects either one of the circuits 88 and 93 to the plus input terminal of the comparator 97 to enable it. terminal ST
When a high level signal is output from , the contacts C and A are turned on, and when a low level signal is output, the contacts C and M are turned on.
and the analog switch 92, which is turned on during the period.

Therefore, the switching circuit 96 enables the third transmission circuit 88 when the opening/closing lid 30 is in the closed state,
When the opening/closing lid 30 is in an open state, the fourth transmission circuit 93 is enabled. As a result, the comparator 97, which forms part of the actuating device 98 for imparting a feed motion to the feed dog turtle 3, connects the D-A converter 87 to its positive input terminal.
DC voltage E4 is applied via either the third transmission circuit 88 or the fourth transmission device 93 and the switching circuit 96. A potentiometer 99 detects the actual position of the feed dog 13 and outputs it as a position signal, for example, a DC voltage E5, via an amplifier 99a.

Potentiometer 99 to the positive input terminal of 108G
A differentiator circuit that receives the DC voltage E5 from the , and applies the DC voltage E5 to the negative input terminal! 01, which combines the signals input to both of its input terminals and supplies this as a feedback voltage E6 to the negative input terminal of the comparator 97. There is.

Then, the comparator 97 receives the supplied divided voltages E4, , E42.
Alternatively, E43 and feedback voltage E6 are compared, and the difference voltage is amplified by the feed control driver 102 and supplied to the feed control actuator 14. Specifically, the feed control driver 02 has a well-known circuit configuration as shown in FIG. Feed control actuator 1 from either one of V,
This is to energize the No. 4 excitation coil 14a. 10
3 stores thread tension information from the semiconductor storage device 64 in line group L.
A latch connected to receive it as an input via C reads and stores the yarn tension information at the time when its clock input terminal CK receives the feed timing pulse P2 as a latch signal via the delay circuit 86. ,
The stored contents are output to the DA converter 104.

This DA converter 104 is configured to convert yarn tension information received as input into a DC voltage E7 according to the code content and output it. 105 is a fifth transmission circuit for receiving the DC voltage E7 from the DA converter 104 and transmitting it at a constant transmission rate. Specifically, as shown in FIG. The D-A converter 104 provided with
The voltage dividing resistor 1 consists of voltage dividing resistors 106, 107, and 108 connected in series between the output terminal 104b and the zero potential terminal.
A constant divided voltage E7 obtained on the anti-zero potential terminal side of 08,
is applied to one fixed contact A of an analog switch 109 having the same configuration as the analog switch 76 described above.

110 is a sixth transmission circuit for receiving the DC voltage E7 from the D-A converter 104 and transmitting it at a variable transmission rate; specifically, as shown in FIG. It consists of the thread tension potentiometer 26 connected between the output terminal 104b and the cloud level terminal of the converter 104, and the variable divided voltage E72 obtained at the sliding terminal of the potentiometer 26 is connected to the other fixed terminal of the analog switch 109. It is connected to the contact M.

The analog switch 109 is the micro switch 5
4 and the signal generation terminal ST constitute a switching circuit 111, and this switching circuit 111 is connected to the switching circuits 78 and 9 described above.
6, either the fifth transmission circuit 105 or the sixth transmission circuit 110 is activated depending on the open/close state of the opening/closing lid 30. 112 is a DA converter 104
A thread tension control device 113 receives the DC voltage E7 from the thread tension controller via either the fifth transmission circuit 105 or the sixth transmission circuit 110 and the switching circuit 111, and applies a pressing force to the thread tension blood in the thread tension regulator. This is a thread tension electromagnetic solenoid for inducing yarn clamping pressure by applying a thread tension control device 112 to the thread tension electromagnetic solenoid 113 in an amount corresponding to the input partial voltage E7 or E72. The structure is such that the thread clamping pressure due to thread tension is regulated by 4 degrees.

The yarn tension control device 112 has a well-known circuit configuration as shown in FIG. It is connected to the. The collector of the transistor 114 is connected to the excitation coil 113a of the thread tension electromagnetic solenoid 113 to which the freewheel diode 116 is connected in parallel.
and an auxiliary switch 117, which is opened as shown in FIG. 11 only when the presser foot 11 is moved upward in connection with the vertical movement of the presser foot 11, to the brass power terminal +V. In addition, in the above configuration, the thread tension potentiometer 26, the amplitude potentiometer 27, the backward potentiometer 28, and the forward potentiometer 29
, the voltage obtained at each sliding terminal is controlled by the operating knob 2 of each potentiometer 26, 27, 28 and 29.
6a, 27a, 28a and 29a are connected to the operation instruction board 20.
The symbol "10" increases when rotated in 5 directions, and the symbol "11 decreases when rotated in 11 directions. That is, the second transmission circuit 77, the fourth transmission circuit 93, and the sixth transmission circuit Transmission circuit 110
The transmission rate of each operation knob 26a, 27a, 28a
By rotating 29a and 29a, the value can be changed to 04. Next, the operation of the above configuration will be described.

First, when either the first operating member 7 or the second operating member 8 is pressed by the operator and a desired stitch pattern is selected as described above, for example, the opening/closing lid 301 is pressed. Therefore, it is assumed that the sewing machine is driven by pressing the operating switch 15 with the operating gate 17 closed. Then, the pattern selection code corresponding to the selected stitch pattern is transferred from the selection counter 60 to the semiconductor storage device 64.
A pair of amplitude information groups and feed information groups corresponding to the above-mentioned pattern selection code ' in the semiconductor storage device 64 as well as thread tension information groups corresponding to these are selected and validated by this fin. A series of information in each validated information group is sequentially specified by the stitch number counter 69 and output to line groups LA, LB and LC, respectively. Therefore, every time the latch 85 receives the sending timing pulse P2 from the monostable multipipulator 67 at its clock input terminal CK, the latch 85 reads the sending information via the line group LB and stores it as 0, and at the same time, the stored contents are stored in the D. - Output to A converter 87. This DA converter 87
outputs the DC voltage E4 according to the input feed information to the third transmission circuit 88 and the fourth transmission circuit 93, but when the opening/closing diamond 30 is closed, the switching circuit 96 outputs the DC voltage E4 to the third transmission circuit 88 and the fourth transmission circuit 93. Since the third transmission circuit 88 is enabled, the DC voltage E4 is supplied to the positive input terminal of the comparator 97 via the third transmission circuit 88 and the switching circuit 96. That is, "DC voltage E4 is converted into a divided voltage E4, which is preset to be suitable for standard sewing work, and is inputted to the actuating device 981. As a result, in the working device 98, the voltage is output from the comparator 97. The difference voltage between the divided voltage E4 and the feedback voltage E6 from the combining circuit 180 is applied to the feed control actuator 14 via the feed control driver 102.
A feeding movement is applied to the feeding dog 13, and the workpiece cloth is fed by a constant feeding amount according to the feeding information read from the semiconductor storage device 64. Also Latch 7
01, in substantially the same way as described above, each time the clock input terminal CK receives the amplitude timing pulse PI from the monostable multipipelator 66, the amplitude information paired with the sending information is read through the line group LA. At the same time, the stored contents are output to the DA converter 71. This D-A converter 71 transmits a DC voltage E according to the input amplitude information to an actuating device 8 through a first transmission circuit 72 and a switching circuit 78, which are activated when the opening/closing lid 30 is closed.
A preset divided voltage E, . Convert and supply. This causes the actuating device 80' to output the divided voltages E, . and synthesis circuit 8
The difference voltage between the feedback voltage E3 from the amplitude control driver 8 and the feedback voltage E3 from the amplitude control driver 8
The sewing needle 9 is controlled to move to a predetermined position according to the amplitude information read from the semiconductor storage device 64. Furthermore, the latch 103 reads and stores thread tension information via the line group LC every time the latch 103 receives the feed timing pulse P2 from the monostable multi-noise brake 67 at its clock input terminal CK, and at the same time stores the stored content. It is output to the DA converter 104. This D-A converter 104 generates a direct current voltage E7 corresponding to the input thread tension information to open/close the lid 30.
A preset partial voltage E7 suitable for standard sewing work is supplied to the thread tension control device 112 via the fifth transmission circuit 105 and the fusuma circuit 111, which are activated when the sewing machine is closed.
, and then supply it. As a result, the thread tension control device 11
2, the amplifier 11 is connected to the base of the transistor 114.
5, the output voltage determined in relation to the divided voltage E7 is given, and the output is determined based on the fact that the presser foot 11 is moved downward and the auxiliary switch 117 is closed during the stitch pattern forming operation. A voltage-dependent collector current is supplied to the thread tension electromagnetic solenoid 113, whereby the thread holding pressure by the thread tension disk is controlled in accordance with the thread tension information read from the semiconductor storage device 64. Thus,
All the information in the pair of amplitude 0 information group and feed information group corresponding to the selected stitch pattern, as well as the thread tension information group corresponding thereto, are read out by the counting operation of the stitch number counter 69 in one round, so that the standard The selected stitch pattern is formed on the workpiece cloth using the horizontal swing amount of the sewing needle 9, the feed amount of the workpiece cloth, and the thread holding pressure of the thread tension plate, which are respectively set in advance to be suitable for various sewing operations. By repeating such a cycle, the same type of stitch pattern is continuously formed. Therefore, if you want to change the shape and size of the stitch pattern formed on the workpiece cloth depending on the sewing work conditions such as the thickness of the workpiece cloth and the sewing location, first press the push button 46. At the same time as opening the operation closing part 17, the opening/closing lid 30 is brought into an upright state. This causes the second transmission circuit 7 to
7. Since the fourth transmission circuit 93 and the sixth transmission circuit 110 are enabled, for example, when amplitude information is read out from the semiconductor storage device 64, the DA converter 71 outputs it accordingly. The DC voltage E, is converted to a variable divided voltage E,2 via the second transmission circuit 77 and the like, and is supplied to the positive input terminal of the comparator 79. Therefore, if the operator operates the operation knob 27a to change the transmission rate of the second transmission circuit 77 by a large amount, the differential voltage output from the comparator 79 will enable the first transmission circuit 72 described above. This is the amplitude control driver 8.
Since the amplitude control actuator 101 is applied via the sewing needle 4, the amount of lateral oscillation of the sewing needle 9 is changed in magnitude compared to a lateral oscillation amount that is preset to be suitable for standard sewing work. Further, when the feed information is read from the semiconductor storage device 64, the DC voltage E4 outputted from the D-A converter 87 in response to this is transmitted to the fourth transmission circuit 93 in the feed direction of the work cloth according to the feed information. Accordingly, it is converted into a variable divided voltage E group or E43, respectively, and is supplied to the positive input terminal of the voltage regulator 97. Therefore, the operator operates the operation knobs 28a and 29a to open the fourth transmission circuit 9.
If the transmission rate of No. 3 is changed in magnitude, the difference voltage output from the comparator 97 will change in magnitude compared to the case where the third transmission circuit 88 mentioned above is enabled, and this will cause the feed control driver 102 to change in magnitude. As a result, the feed amount of the work cloth by the feed dog 13 is changed by a large amount of 4.0 degrees compared to a preset feed amount suitable for standard sewing work. In this case, the feed amount when the work cloth is sent in the backward direction is changed by the operation knob 28a, and the feed amount when the work cloth is sent in the forward direction is changed by the operation knob 29a. Further, when the thread tension information is read from the semiconductor storage device 64, the DC voltage E7 output from the D-A converter 104 is converted into a variable divided voltage via the sixth transmission circuit 110, etc. It is converted into E72 and supplied to the thread tension control device 112. Therefore, when the operator operates the operation knob 26a to change the transmission rate of the sixth transmission circuit 110, the output voltage from the amplifier 115 applied to the base of the transistor 114 in the thread tension control device 112 is changed in magnitude. , the collector current of the transistor 14, that is, the current supplied to the electromagnetic solenoid for thread tension 113, is varied in magnitude, so that the thread clamping pressure by the thread tension disk is set in advance so that it is suitable for standard sewing work. It changes in size compared to the force. As described above, it is possible to adjust the lateral swing amount of the sewing needle 9, the feed amount of the workpiece cloth, and the thread clamping pressure of the thread tension plate in accordance with the above-mentioned special sewing work conditions. Therefore, the shape and size of the stitch pattern can not only be set to be suitable for standard sewing work, but also be varied in various ways, and the variety of sewing work that can be performed by the operator can be greatly increased. The first, third, and fifth transmission circuits 72, 88, and 1 have a constant transmission rate in conjunction with the opening/closing operation of the opening/closing lid 30.
05, or any one of the second, fourth, and sixth transmission circuits 77, 93, and 110 having a variable transmission rate is enabled, so the operator can visually check the open/close state of the opening/closing diamond 30. By doing so, it can be easily confirmed which transmission circuit is enabled. According to the present invention, as is clear from the above description, in order to obtain the horizontal swing amount of the sewing needle and the feed amount of the workpiece cloth suitable for special sewing operations, manual adjustment is made in the storage chamber installed in the sewing machine frame. A second transmission device whose transmission rate changes when the device is operated is provided, and a first transmission device with a constant transmission rate suitable for standard sewing work is connected to the opening/closing lid attached to the storage chamber. The structure is configured so that the operator can selectively switch between the two by opening and closing the lid, thereby making it possible to perform a wide variety of sewing operations. It is possible to provide a stitch adjustment device for a sewing machine that can be determined based on the condition.

Brief explanation of the data drawings The drawings relate to one embodiment of the present invention, and FIG. 1 is an overall perspective view, FIG. 2 is an enlarged perspective view of the main parts, and FIG. 3 is an enlarged plan view of the main parts. Figure 4 is a sectional view taken along line W-W in Figure 3, Figure 5 is a sectional view taken along line V-V in Figure 3, and Figure 6 is a sectional view taken along line V-V in Figure 3.
The figure is an enlarged perspective view of the part related to the opening/closing operation of the opening/closing lid, FIGS. 7 and 8 are enlarged perspective views showing parts of the part related to the opening/closing operation of the opening/closing lid, and FIG. 9 is a block related to the electrical configuration. The diagrams, FIGS. 10 and 11, are electrical circuit diagrams showing a specific configuration of a portion of FIG. 9.

In the figure, 1 is a machine frame, 9 is a sewing needle, 1 is an amplitude control actuator, 13 is a feed dog (feed device), 14 is a feed control actuator, 16 is a storage chamber, 26 is a thread tension potentiometer, and 27 is an amplitude control actuator. potentiometer (manual adjuster), 28 is a reverse potentiometer (manual adjuster), 2
9 is a forward potentiometer (manual adjustment); 30 is an opening/closing lid; 35 is a support member; 39 is an engaging portion; 64 is a semiconductor memory device; 69 is a stitch number counter; 71, 87, and 104.
is a D-A converter (conversion device), and 72 is a first transmission circuit (
77 is a second transmission circuit (second transmission device), 78 is a sliding door circuit (switching device), 80 and 98 are actuating devices, 88 is a third transmission circuit (first transmission equipment),
Reference numeral 93 indicates a fourth transmission circuit (second transmission device), and reference numeral 96 indicates a switching circuit (switching device). Figure 1 Figure 3 Figure Spots Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure n Figure 9 Figure 10

Claims (1)

[Claims] 1. A sewing needle capable of vertical reciprocating movement and lateral rocking movement;
a feeding device that applies a feeding motion to the workpiece cloth in time with the vertical reciprocating motion; and a digital stitch signal that controls the lateral rocking motion and the feeding motion to form at least one stitch pattern. a converting device that receives digital stitch signals sequentially read out from the storage device in synchronization with the vertical reciprocating motion and converts the stitch signals into analog stitch signals corresponding to the digital stitch signals; , an actuating device that operates the sewing needle and the feed device according to the magnitude of the analog stitch signal, the actuating device transmitting the analog stitch signal output from the conversion device at a predetermined transmission rate. a first transmission device for transmitting to;
a second transmission device for transmitting the analog stitch signal outputted from the conversion device to the actuation device at a variable transmission rate; an opening/closing lid that opens and closes according to the
a manual regulator disposed in the storage chamber to change the transmission rate of the second transmission device; A stitch adjustment device comprising a switching device that operates in conjunction with the opening/closing operation of the opening/closing lid to enable the second transmission device when the lid is in an open state. 2. The manual adjuster includes one potentiometer for adjusting the horizontal swing amount of the sewing needle, and two potentiometers for individually adjusting the forward feed amount and backward feed amount of the work cloth. The stitch adjustment device according to claim 1, further comprising a meter.