JPS6013712B2 - Sewing machine thread tension device - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a thread tension device for a sewing machine that can automatically set the strength of thread tension according to the type of stitch pattern, and can also adjust the set value to suit sewing conditions or special stitches. As is well known, even if the thread tension applied by the thread tension applying device is constant, the tightness of the sewing thread, such as the upper thread, when forming a seam depends on various factors, such as the needle lowering position, the direction of feed of the workpiece cloth, and its direction. This is affected by the feed amount, the amplitude of the needle's lateral movement, whether it is full stitch or chain stitch, etc., so it is especially important to find the optimal thread kneading level for each type of stitch pattern to be formed, especially in pattern sewing machines. It is difficult to obtain, and
It is also difficult to obtain uniform thread length for each stitch in the same stitch pattern. However, the conditions for achieving a uniform thread warp due to the above factors are partly due to the structure of the sewing machine, but
Generally speaking, with respect to the needle lowering position, the thread tension is set higher when descending to the right than when descending to the left, the thread tension is set higher when moving forward than when moving backwards regarding the feeding direction of the work cloth, and the feed pitch is set at a small value regarding the feed amount. The thread tension is set higher when the feed pitch is larger than when the swing pitch is larger than when the swing pitch is larger than when the swing pitch is larger than when the swing pitch is larger. The goal is to increase the thread tension. If the thread tension is set in consideration of these conditions, a relatively uniform thread tightness can be obtained. By the way, one representative example of the prior art that automatically controls thread tension is ``By controlling the tension of the upper thread, the lower thread of a different color than the upper thread is exposed or not exposed on the upper surface of the workpiece fabric. There is a device that can obtain a dotted color pattern using a cam, but this has a configuration in which the thread tension information is stored in a cam.This technology can be applied to a sewing machine that forms many types of stitch patterns, as described above. To remove defects,
It is necessary to prepare many types of cams corresponding to many types of seam patterns, and the shapes of these cams and the configuration of these mechanical displacement transmission mechanisms are complicated, so it is difficult to use mechanical methods such as cam control. It is not practical to control the thread tension. In addition, ``Other prior art attempts to automatically adjust the thread tension according to the sewing speed so as to obtain a constant thread tightness regardless of changes in the sewing speed of the workpiece fabric.'' There are sewing machines that control thread tension based on a single factor called sewing speed, but there are sewing machines that control thread tension by taking into account multiple factors. Thus, in the prior art, there is no device that can set the thread tension in connection with the selection of the stitch pattern and also adjust the set value by means of electrical signal means.The present invention was developed in view of this situation, and its purpose is to easily set thread tension suitable for forming each stitch pattern among a large number of predetermined stitch patterns in connection with pattern selection operations. It is an object of the present invention to provide a thread tension device for a sewing machine that can adjust the setting value according to sewing conditions other than the type of pattern or special stitches. 1 and 2 showing an overview of the mechanism of a sewing machine to which the present invention is applied. It comprises an upper shaft 5 and a lower shaft 6 which are connected to each other via a well-known drive mechanism (not shown) so as to be time-related, with the upper shaft 5 being connected via a main pulley 7 (not shown). It is designed to be rotated by a drive motor that does not operate.
8 is a needle rocking device that gives a horizontal rocking motion to the sewing needle 9;
Detailed illustrations will be omitted since known means are sufficient for its configuration, but ``the swing support 10 directly contributes to the swing movement.
A needle bar 11 is provided on the upper shaft 5 so as to reciprocate up and down, and the sewing needle 9 is connected to the needle bar 111. The swinging support turtle 0 gives the sewing needle 9 a lateral swinging motion.
is designed to be swung by the drive link 12.
For this purpose, one end of the drive link 12 is connected to the swing support 1.
It is pivotally connected by a shaft 13, and the other end is connected to an amplitude control actuator 4, which will be described later.This amplitude control actuator 4 controls the lateral swing amplitude of the sewing needle 9. The tortoise 5 is a feed device that imparts a feed linkage to the work cloth in conjunction with the up and down reciprocating movement of the work cloth sewing needle 9. Since a known configuration for this feed device 15 is sufficient in the present invention, it is referred to as "the present invention". Only the parts useful for understanding are illustrated.In the feed device turtle 6, the feed drive shaft 16
is rotationally driven from the lower shaft 6 via a gear mechanism turtle 7, and the rotation of the feeding drive koji 6 is controlled by a link 211 via a cam electric 8, a cam holding village 19, and a shaft 2Q.
This is transmitted as an oscillating motion, which further excites the feed dog 23 via the feed bar 22 to make a feed movement. As is well known, the shaft 20 has a groove 2 provided in a grooved member 24' so that the feed amount (feed increment) and the feed direction of the workpiece cloth can be controlled by -times of feed movement of the feed dog 23.
5; It is equipped with pieces that can be laid down. The grooved member 2W is integrally connected to a lock shaft 24a, and a lock arm 24b is connected to this lock shaft 24a, and furthermore, this lock arm 24b' is connected to one end 27 of an adjustment village 26. When the adjustment village 26 is mechanically displaced in its longitudinal direction, the lock shaft 24a is rotated via the lock arm 24b, so that the grooved member 24
is rotated, and thus the inclination angle of the groove 25 is controlled.As is well known, the inclination angle of the groove 25 and the direction of its rotation determine the amount of feed of the work cloth and the direction of its feed. A feed control actuator 28 is provided which mechanically displaces the adjusting punch 26 in order to control the grain size and direction.The feed control actuator 28 will be described in detail next.
This essentially corresponds to a DC type reversible linear motor.
This is equipped with a "character-shaped magnetic yoke 29, and permanent magnet plates 30, 30 are fixed to the inner surfaces of the opposite sides thereof in a relationship such that the mutually opposing surfaces have the same densities, and both permanent magnets Board 3
A neutral magnetic leg 31 is attached to the screw 3 at the intermediate portion between the opposite sides of the wires 0 and 30.
2, the magnetic yoke 29 is fixed to the magnetic yoke 29. An extremely lightweight bobbin 34 wound with a coil 33 is inserted into the neutral magnet leg 31 so as to be linearly movable. 35 is a cover plate made of magnetic material fixed to the neutral magnetic leg 31 with screws 36, and a pair of slots 3 of this cover plate 35
7, 37 to arms 38, 38 integral with the bobbin 34;
protrudes through the lever 48, and one end 41 of a lever 48 is supported by a shaft 39 between the tips of each arm 38, 38, and a retaining ring 42 prevents the shaft 39 from coming off. A support plate 43 is connected to the lower part of the cover plate 3 through a connection means (not shown), and a plurality of support protrusions formed on the support plate 43 have a central part of the lever 40 connected to the rotation axis. It is supported by a turtle 4, and this rotation shaft 4 is supported by a bar 4.
It is designed to rotate together with 0. and lever 4
The adjusting punch 26 is connected to the pond end 45 of the 0 part. The rotation shaft 41 of such a feed control actuator 28 is connected to a rotation shaft 47 of a well-known resistance type potentiometer 46. According to the feed control actuator 28, when a DC current is applied to the coil 33, this current and the magnetic field generated by the permanent magnet plates 38, 30 generate a linear movement force in the coil 33 proportional to the current value, and this causes the bobbin 34 to When the lever 40 moves along the neutral magnetic leg 31, the lever 40 rotates in the corresponding direction around the rotation shaft 44, and this rotation rotates the sliding ball 47 of the potentiometer 46. . The amplitude control actuator 14 described above also has the same configuration as the feed control actuator 28 described above, and is equipped with a similar potentiometer 48.
The lever in Kamegawa is connected. Reference numeral 49 is a pulse generator that generates a timing pulse (in direct terms, a first timing pulse BCP for amplitude control, which will be described later) in conjunction with the upper shaft 5. Incidentally, 50 shown in Fig. 1 is each unit of an electric circuit to be described later, and Fig. 1 shows the arrangement row thereof.Next, The thread tension device 51 (not shown in Fig. 1) shown in Figs. A thread tension electromagnetic actuator for tension control is composed of an electromagnetic solenoid, and a magnetic cavity 55 into which a plunger 54 is loosely inserted is formed inside the actuator.56 and 57 apply tension to the sewing thread, especially the upper thread. A pair of thread tension members, ie, thread tension members, are loosely inserted and supported by a pair of pins 59 protruding from another support plate 58 in a two-layered state. is a push rod that presses one thread tension disc 56 against the other thread tension disc 511, which is connected to the fixing plate 611.
The fixing plate 61 is fixed to the arm portion 4 with screws 62. A fulcrum part of a plunger interlocking lever 63 is pivotally attached to the fixed plate 61 by a stepped screw 64, and one end 63a of this is brought into contact with the end 60b of the push rod 60, and the end 63b is formed at the tip of the plunger 54. It is rotatably connected within the split groove 66 by a pin 66. Reference numeral 67 denotes an auxiliary switch for controlling power supply and cutoff to the thread tension electromagnetic actuator 52 in connection with the operation of the workpiece presser device 68 for pressing the workpiece cloth, and a screw 69 is attached to the arm portion 4.
A mounting plate 70' supported by is attached. Reference numeral 71 denotes a switch opening/closing lever, which is rotatably supported by stepped screws 73 on the fixed plate 61 via a sleeve 72 provided thereon. Normally, each end provided on the sleeve 72 is connected to the fixed plate 61 and the fixed plate 61. The switch opening/closing lever 71 is rotated clockwise in FIG. 4 by the torsion spring 74 engaged with the switch opening/closing lever 71, whereby one end 71a of the switch opening/closing lever 71 presses the actuator 75 of the auxiliary switch 67 to bring it into the closed state. ing. In the workpiece presser device 68, reference numeral 76 denotes a presser bar which has a presser foot (not shown) at its lower end and whose middle part is supported by the arm part 4 so as to be movable up and down; A sliding cam receiving plate 79 is fixed to the cam surface 78 of the presser foot lifting cam 77, and the fulcrum portion of the presser foot lifting cam 77 is connected to the stepped screw 80' by the arm portion 4.
It is pivoted to. A presser foot lifting lever 81 integrated with the presser foot lifting cam 77 projects outside the arm portion 4. 8
Reference numeral 2 denotes a rotary lever that is linked to the vertical movement of the presser foot 76, the fulcrum of which is pivotally attached to an appropriate part of the arm 4 by a stepped screw 83, and the other end 82b is connected to the end of the switch opening/closing lever 71. 71M face each other at positions where they can be engaged. In the above description, the electromagnetic actuator 52 has one thread tension disc 56,
57, and in a state where the support plate 58t, thread tension blood 67, 56, push rod 60 and plunger interlocking lever 63 are in sequential contact with each other, the terminal end surface 55a of the magnetic cavity 55 and End face 54 of plunger 54
The rope is attached so that there is a slight gap (for example, 0.1 gap in the direction of movement of the plunger) between the plunger and the plunger. When the needle thread is inserted between the thread adjustment discs 66 and 57, the gap between the end surface 56a of the magnetic cavity 55 and the end surface 64a of the plunger 54 is at most 0.4 side in the direction of movement of the plunger. Therefore, as long as the plunger is located within its movement range, the electromagnetic actuator 6
An electromagnetic solenoid is used in this embodiment, which has a characteristic that the attraction force of 2 depends only on the magnitude of the supplied current and does not depend on the attraction position of the plunger. In addition, in FIG. 5, there is a slot for guiding the upper thread from an upper thread supply source (not shown) until it reaches the thread tension point 56957, and a thread guide spring and a thread take-up spring. Next, the needle hole incision device will be explained with reference to FIGS. 6 to 9 (illustration is omitted in the 1st Army map). The first electromagnetic solenoid and the second electromagnetic solenoid are used for switching needle holes, etc., and the plungers 9 and 90 loosely inserted into these are of a type that protrudes and moves when energized, Both ends 33a and 93b of a connecting plate 93 are loosely inserted into each split groove 91 formed at the tip of each plunger 89 and 98, and the both ends 93a and 93b are pivotally supported in each split groove 91 by a pin 92. has been done. Stoppers 94 and 95 are fixed to appropriate stationary parts, respectively, and these stoppers face the tips of the plungers 8 and g0 in order to control the amount of protrusion. Reference numeral 96 denotes a lever whose fulcrum part is rotatably connected to a suitable stationary member 971 by a stepped screw 98, and one end of this lever is rotatably attached to the intermediate portion of the connecting plate 93 by a stepped screw 99. Even if the lever 96 is connected, the other end of the lever 96 has a pivot rivet O.
It is connected to one end of the operating shaft 101 via Q. The operating camphor turtle 01 is always urged by the spring 102 in the direction opposite to the direction of the arrow 182a. The ikebata with zero operation amount is connected to a known mechanism for selectively performing zigzag main stitch, straight main warp, and chain stitch.Specifically, the above-mentioned operating screen 181 is based on the above-mentioned known publication. Tokuseki Sho 50
This corresponds to the working punch 26 shown in Japanese Patent No. 31944.
FIGS. 8 and 9 show the above-mentioned mechanism, especially the part related to the needle-hole effect, in order to facilitate understanding of the present invention.
This is an excerpt from Publication No. 31944. Part a
In the figure, the hook 08' has a separator opening amount Q4 for the feed dog 23, a horizontally long hole turtle Q5 for all zigzag use, and a round hole 186 for straight stitching connected to the central front edge of the horizontally long hole turtle D5. With the formed throat plate, this is arranged so that the support plate IQ7 can be moved to the 108 tatami mat, and the needle plate force 83 is used for the swamp movement.
The pin 189 provided as a shield on the lower surface of the pin 189 is in a competitive range with the most holed tortoise wing 8 formed by the pin 881. In Figure 9, Kame 1 is a tri-arm-shaped intermediate lever, the central part of which is attached to the fixed Fujitomi 2, and the spring 1 is always attached.
13 in the clockwise direction, one arm part 1 turtle umbrella is attached to the pin electric turtle 8 provided on the operating frame 101, and an open groove turtle formed in the other arm part i6. The lower part of the pin 9 provided on the throat plate IQ3 is engaged with the needle plate IQ3 during operation. The left end of the operating Kajikame QI in Figure g is connected to the overall chain mechanism, as described in detail in the aforementioned Tokukan Sho No. 5031944, and the only structure described therein is Since it is not directly related to the present invention, the explanation will be omitted. Now, the first construction diagram shows that when the first electromagnetic solenoid 87 is de-energized and the second electromagnetic solenoid 8 is energized at the same time, each tip of each plunger 899 will stop at the stopper 9. As a result, the connecting plate 98 is moved a distance in the direction of arrow 18 as a whole, and the connecting plate 9 is moved through the stepped screw 99.
Since the lever 96 connected to the middle part of 3 is rotated in the direction of arrow 119 around the stepped screw g, the lever 96 is rotated by a distance corresponding to the distance that the operating lever 181 moves the connecting plate 93 in the direction of arrow 118. "It is moved in the direction of the arrow turtle 82a while resisting the tensile force of the spring lq2, and thereby the operating rod 101
The pin 115 provided in is moved to the MP2 position in FIG.
This position corresponds to the chain total operating position. Next, as shown in FIG. 6, the first electromagnetic solenoid 87 is disconnected and its plunger 89 is in the bowed state, and at the same time, the second electromagnetic solenoid 88 is energized and its plunger 90 is in the protruded state. In this case, the moving distance 12 of the connecting plate 93, particularly the stepped screw 99 portion, in the direction of the arrow 118 is smaller than that described above, and the operating frame 101 also moves in the direction of the arrow 102 by a smaller distance than described above. At this time, the pin 115 reaches the illustrated MPI position, and this position corresponds to the straight lockstitch position. Next, when the first and second electromagnetic solenoids 8788 are de-energized at the same time,
Since both of the plungers 8990 are in the retracted state, the connecting plate 93 as a whole is in the most backwardly moved state in the direction opposite to the direction of the arrow 118, so that the operating force is 0.
1 is also in the most moved state in the direction opposite to the arrow 102a direction, and therefore the pin vine 15 of the operating Kabagame QI is at the MP position shown in the figure.
Located at Q. Now, when the pin 115 is at the MPO level and one arm 114 is in contact with the pin turtle 15 due to the rotation of the intermediate lever 86 by the spring 113, the intermediate lever 111 is moved most counterclockwise. When the opening groove 117 reaches the rotated position, the throat plate 1
The pin IQ9, which is integrated with 03, is in contact with the rear end of the elongated hole 110 (lower end in Fig. 8), and at this time, the needle plate 0
3, the oblong hole turtle 85 formed in this is located at a position that matches the needle lowering position. ``This is the zig-sag lock stitch position of the needle plate holder Q3.
When the intermediate lever 111 is moved to the position shown in FIG. The throat plate 03 is also moved in the same direction so that the round hole 106 of the throat plate 103 coincides with the needle lowered position, and a straight stitch operation is performed at this position. Next, let's take a look at this sewing machine's feed control of the fabric to be processed and the "sewing needle 9".
A control circuit that electrically performs swing amplitude control, sewing thread tension control, and needle hole cutting control will be described. The overall configuration of this electrical control circuit is shown in FIG. In order to selectively enable three information groups, which are oscillation amplitude information, feeding information, and thread tension information, which are electrical signals corresponding to various types of stitch patterns as will be understood later, the operator A pattern selection device I21 that is selectively operated by
generally consists of a pattern selection switch group 122, an encoder 123, and a selection code holding circuit 124. The pattern selection switch group 122 consists of eight pattern selection switches SO to S7 that are closed only while applying pressure with fingers, and each of them is indicated by the same reference numeral in FIGS. 16A to 16. It corresponds to each type of stitch pattern and is used for selecting these. One end of each pattern selection switch SO to S7 is a low potential terminal (
For example, the other end is connected to the encoder 1
23 input terminals. This encoder 1
In 23, the decimal number 0167 is assumed for each of the pattern selection switches SQS1S6S7, and ``When any one of the pattern selection switches SQ to S7 is closed, the decimal number assumed for this is converted into a binary code. , each bit is outputted via the line LI corresponding to each bit, L12 and L14, and a separately provided line LI5.
When any one of the pattern selection switches SO to S7 is opened, a reset signal CP is generated which changes from a low level to a high level and returns to a low level after a certain period of time. This reset signal CPI' has a resistor of 125 and a resistor of 1.
Integrating circuit 1 formed by 26 and capacitor 127
28, a NAND circuit 129, and an inverter 130, and is converted into a reset pulse RSP, which is output to a reset output terminal 132 of the waveform conversion circuit 131. The selection code holding circuit 124 includes three flip-flop circuits FF1 and FF2 that receive corresponding bits from the encoder 123 as inputs via lines LI1, L12, and L14.
, FF4 are provided, and these store each bit from the encoder 123 at the time when the reset pulse RSP is input to each clock input terminal CK via the lead wire 133. 12
4, when any one of the pattern selection switches SO to S7 is opened, it is encoded with a binary code and "
In other words, it is stored as a 3-bit selection code, and when another one of the pattern selection switches SO to S7 is closed, the newly opened selection code is stored again in synchronization with the reset pulse RSP. The currently stored selection code is output to lines L21, L22, and L24 corresponding to the bits. On the other hand, when the sewing machine is in operation, the pulse generator 49 generates a first timing pulse BCP for amplitude control as shown in FIG. In this figure 5, 134 represents the vertical movement locus of the needle tip when 135 shown by a straight line is the upper surface of the throat plate, and 136
1 indicates a period in which the feed dog 23 protrudes upward from the needle slope upper surface 135 to apply feed to the work cloth. A second timing pulse F for feed control or yarn tension control as shown in FIG. 15 in relation to the first timing pulse BCP.
In order to obtain CP and for reasons that will be understood below, the reset output terminal 132 is connected to one input terminal of a NAND circuit 39 via a delay circuit 137 and an inverter 138, and is also connected to a pulse generator. The first timing pulse BCP output line L31 of 49 is connected to the other input terminal of the NAND circuit 139, and the output line L31 is connected to the count input terminal of a first address counter 140 corresponding to a readout device. , and the output line L32 of the NAND circuit 139 is connected to each counting input terminal of a second address counter 41 and a third address counter 142 corresponding to other reading devices,
The reset output terminal 132 is connected to each reset input terminal RT of the address counter 140 and the counter 41142. Here, "delay circuit 137, inverter 38
The NAND circuit 139 as a whole has a pulse distributor amount of 43
It consists of Since the reset output terminal 132 is always at a zero level, that is, generally at a low level potential, except during the period when the reset pulse RSP is generated, the output of the inverter 138 is at a high level, and therefore, when the sewing machine is running. , when the first timing pulse BCP is applied to the other input terminal of the NAND circuit 139, the NAND circuit ! 39 output line L32
A second timing pulse FCP corresponding to a phase-inverted version of the first timing pulse BCP is output. Said first to third address counter turtle fins, 141
, 142 has a hexadecimal binary counter configuration,
When any one of the pattern selection switches SQ to S-thin is selected and opened, the reset pulse RSP resets the decimal number (0).
), and then the first address counter &Q counts the pulse CP2 generated at the falling edge of the first timing pulse BCP input to it, and Counters 141 and 142 count pulses CP3 (see FIG. 15) generated at each falling edge of the second timing pulse FCP.Therefore, as is clear from FIG. The third address counters 141 and 142 count in synchronization with the time TO when the sewing needle 9 descends from the top dead center and reaches a position slightly below the throat plate 103.
The first address counter 140 relating to swing amplitude control in the vertical direction counts in synchronization with the TI time when the sewing needle 9 rises from the bottom dead center and comes out of the work cloth. Therefore, the second and third address counters 141, 142 are always in a relationship that their counts are incremented by one relative to the first address counter 140'. Reference numeral 144 denotes a first semiconductor memory device, which stores a large number of needles (eight in this embodiment) that controls the lateral oscillating movement of the sewing needle 9 in order to form the various stitch patterns shown in FIG. ) to obtain a group of vibration amplitude information. As shown in the "amplitude information tree" in FIG. The amplitude information determines the lowering position of the sewing needle 9 for forming one stitch, that is, the needle position coordinates (see FIGS. 16 and 17). The first address decoder 145 inputs the count contents of the first address counter 148 as an address code via output lines L42 and L44 in the binary code format, and converts this into a decimal number. address designation terminal D
One of the numerically corresponding terminals from Q to D5 outputs a low-level potential, and the other terminals remain at a high level.To explain this with an example, the first address The address code output from the counter turtle 48 is such that its output line L4 is the least significant digit, and the output line 144 is the most significant digit, and the code according to this embodiment is all 8, winter. ?2,1 code is used, so if the count value of the first address counter is (2}, the address code input to the first address decoder is the logical code from the upper order). The sequence is “0”
10'', and only the terminal D2 corresponding to the decimal number t21 is set to a low level, and if the count value is t31, the address code becomes ``011'', and only the terminal D3 corresponding to the decimal number {8}' is set to a low level. be done. On the other hand, the first semiconductor memory device 144 has an information setting circuit network 146 and a first multiplexer group 147.
7 is composed of four multi-breathacs 148 to 161, each of which constitutes oscillation amplitude information for one stitch with four bits, as shown in the "amplitude information" column in FIG. In this embodiment, the multiplexer 148 corresponds to the least significant bit, and the multiplexer 151 corresponds to the most significant bit, while in the "amplitude information" column of FIG. Among the least significant digits, the leftmost bit corresponds to the most significant digit. next,
The detailed connections in FIG. 12 will be explained. That is, in FIG. 12, the output line L41 is
5 to the multiplexer 14, and connect this line L51 to the multiplexer 14.
8 input terminals P1, P2, input terminals P1 of the multiplexer 149, input terminals P1, P2 of the multiplexer 150
and the input terminal PI of the multiplexer 151, respectively, and furthermore, the output line L41 is connected to the input terminal PI of the multiplexer 151.
The line L52 is commonly connected to the input terminals P4 and P6 of the multiplexer 148 and the input terminals P4 and P6 of the multiplexer 150. Lines L53, L54, L55 and L56 are connected to addressing terminals ○2, D3, D4 and ○5 in order, respectively;
Among them, lines L53, L54, and L55 are connected to different input terminals of the NAND circuit 163, respectively, and lines L54,
L55 and L56 are connected to different input terminals of the NAND circuit 154, line L55 is further connected to each input terminal P3 of multiplexers 148 to 15i, and line L56 is connected to each input terminal P4 of multiplexers 149 and 151. , the output terminal of one NAND circuit 153 is connected to each input terminal P2 of multiplexers 149 to 151, and the output terminal of the other NAND circuit 154 is connected to each input terminal P6 of multiplexers 149 to 151. The respective input terminals P0, P5, P7 of multiplexers 148, 149 and 1501 are connected to line L57.
Furthermore, this line L57 is connected to a low potential terminal. The selection code holding circuit 124
The line L2, L corresponding to each bit connected to the output side of
22, L24 are respective selection input terminals L1, L in the multiplexers 148 to 151, as shown in FIG.
2 and L4 so that the digit positions match, respectively, so that the selection code output from the selection code holding circuit 124 is supplied to the multiplexers 148 to 151. These multiplexers 148 to 151' each have one bit output terminal YI to Y4, and each bit input terminal X1, X2, X3, 4, respectively. In the circuit of FIG. 12, a low potential level corresponds to a logic code "0", a high level corresponds to a logic code "1", and in the multiplexer 151, the three input terminals P0, P5; P7 is open and always in the state of logic code "1". Multiplexer 148 to 1
51 have the same function, multiplexer 1
48 as an example, its selection input terminals L1, L
2. Receive a selection code in L4, and check the numerical content of the selection code.

[1}, the bit content of input terminal PI (logical value 0 or 1) is output to bit output terminal YI, and if the numerical content is '21, the bit content of input terminal P2 is output to bit output terminal YI. It has the effect of The pattern selection switch SO among the eight types of stitch patterns selected by the respective input terminals PQ' of the multiplexers 148 to 151 and the pattern selection switches SO to S7
The oscillation amplitude information of each stitch forming the corresponding straight stitch is sent to each input terminal P of the multiplexers 148 to 151.
Similarly, a total of four input terminals PI create oscillation amplitude information for each stitch for forming a zig-sag stitch selected by the pattern selection switch SI. and the other four input terminals P2 to P7
In the same manner as described above, oscillation amplitude information regarding each stitch for forming different types of stitch patterns shown in FIGS. 16C to 16 is created. In this embodiment, as described above, six pieces of oscillation amplitude information are collected to form one oscillation amplitude information group, and the configuration of this group is for each multiplexer 148 to 15.
For example, when the pattern selection switch SO in the information setting circuit 1 is selected, the bit contents of the input terminal PO are changed as the count of the first address counter wing 40 progresses.
Based on the principle that the information is sequentially rewritten according to the settings in 46, each stitch pattern is composed of six pieces of vibration amplitude information. Therefore, in FIG. 12, for example, when the pattern selection switch S8 is selected, the first address counter KAMEKAME counts from (0) to (5' in decimal notation) as shown in FIG. Each time "bit output terminal Y turtle,
Y3, Y2? Y Kawako is using the other pattern selection switches S to S?, such that the oscillation amplitude information of the code content "1000" shown in the "amplitude information Kazuki" of the dragon diagram A is sequentially output. "Amplitude information" from Figure 7 B to Day when selecting each of
The oscillation amplitude information of the code shown in the column is the bit output terminal Y.
The wiring is such that the output is sequentially output to Fu Y3, Y Mitsu, and Y Haku. Then, the oscillation amplitude information that is sequentially output from the bit output terminal Y of the multi-plexer Tomoyoshi to the military flea turtle with the code contents as shown in the column "Amplitude information of each r of the No. 1 map to the Y army" is "The first ○-public converter katsu 5's bit input terminal X mind, X39 A feedback voltage E2 is applied from the potentiometer to the positive input terminal of the first comparator SS, and a feedback voltage E2 corresponding to the position of the sliding feed 7 is applied to the negative input terminal of the potentiometer. Then, the first Machiyama A converter is supplied with the above-mentioned two voltages E and E2's voltage E3 through the amplitude control driver electrode to the amplitude control actuator Machiyama coil 33. Next is the second semiconductor memory device shown in Figure 3, which is also used to form various seam patterns as shown in Figure 16. This is for obtaining a large number (eight in this embodiment) of sending information groups for controlling the feeding movement of the feeding teeth 23 of the feeding device 5. It is essentially the first semiconductor memory shown in FIG. It is of the same machine as device 144. That is, ~ This second semiconductor storage device is the output line 1, LS2, 1 Rumor 4 from the second address counter Yugame Kamekame. A second address decoder L that receives an address code via a second multiplexer group t consisting of similar multiplexers S to Tomi 64; A second D-A converter similar to the above having a 68G bit input terminal Shigekame to X Tomi and an analog output terminal Father fin Tomi 166 is an information setting circuit network. , selection input terminal LI? of each multiplexer 161 to 164.
L2, L4 are the lines L22, L drawn out from the output side of the selection code holding circuit 24.
A selection code is provided via 24. Address designation terminal DQ; D3 of the second address decoder 159 is connected to a NAND circuit.

[Connect to 61 different input terminals and connect the output terminal to the line L through the inverter fin 8.
Connect this line 1y wing to multiplexer I
Commonly connected to input terminals P55 and P61 of Sfu mother 64. The addressing terminal D of the second address decoder S9 is connected to different input terminals of the NAND circuit 389, and its output terminal is connected to the input terminal P3 of the multiplexer Ryushoku 3 via the inverter-Yutomi 7. do. Turtle 7 Two changeover switches that work on each other Turtle 2, Turtle? 3, the - side fixed pocket piece a of one cut-off switch turtle 72 is directly connected to the low potential terminal, and the other fixed half piece b is connected to the low resistance wing. Connect the high potential terminal 1 through G to connect the movable contact c to the line L7.
This line t blue is connected to one input terminal of the NAND circuit through an inverter 76, and the output terminal of the NAND circuit is connected to the other input terminal. Furthermore, connect the line Z to the line 1, and connect this line 17 to the input terminal P89 of the multiplexer 6.
IgP2 case mother, P ~ input terminal P box mother P head of multiplexer force S2; P3, P? and multiplexer 868
The input of Satoko Kani is followed by P mother and P, respectively. The output terminal of the NAND circuit is commonly connected to the input terminal P of the multiplexer 2 through the inverter. Also, is there a manual automatic switching device for feeding?Put the other changeover switch wing 7 of the stove ~ its one fixed piece a
Takama is connected to the analog output terminal 1 of the second D-A converter Kamikage 6, and this connection point is connected to the low potential terminal via the variable partial voltage low resistor. The movable cap c is connected to the electrode element ga of the variable voltage dividing resistor 79, and the movable cap c is connected to the positive input terminal of the second comparator 88. A feedback voltage E,2 from a potentiometer 4 provided in the feed control actuator 2 is applied to the negative input terminal of the fin.
The output terminal of the second ratio controller 180 is connected to the coil 33 of the feed control actuator 28 via a feed control driver 181. Now, in the above second semiconductor memory device 158, each piece of feed information is for giving a feed amount to the work cloth for forming each seam,
(11) and (15) shown in the “feed increment” column in Figure 17.
), (15), etc. are shown for convenience to indicate the degree of feed amount, and (10) and (1) signs indicate that the feed direction of the processed cloth is forward and backward, respectively. It represents something. As shown in FIG. 17, each feed information group corresponding to different types of stitch patterns is composed of six pieces of 4-bit feed information collected to form one feed information group, and in this invention, as shown in FIG. No. 17 corresponding to each stitch pattern shown in
Eight sending information groups shown in the figure have been created. 182 shown in FIG. 14 is a third semiconductor memory device that stores a group of thread tension information shown in the "thread tension information" column of FIGS. 17A to 17;
183 is the third address counter 142, which corresponds to a reading device, and the count contents are output to output lines L81, L.
82 and L84, the third address decoder is inputted as an address code in the binary code structure as it is, and is provided with address designation terminals ○0 to D5. Here, the output line L81 corresponds to the least significant digit, and the output line L84 corresponds to the most significant digit. 184 is a third multiplexer group similar to the above, and includes three multiplexers 185, 186, 1.
87, each of which has input terminals PO to P7 for inputting information as described above, and these input terminals PO
to P7 are connected to the information setting circuitry 188. Next, the detailed wiring will be described. That is, line L90,L
91, L92, L93, L94 and L95 are connected to corresponding address designation terminals DO to D5 of the third address recorder 183, respectively. Above line L91
, L92, and L93 are connected to different input terminals of the NAND circuit 189, and the output terminal thereof is connected to the input terminal P2 of the multiplexer 187. Line L90, L94,
L95 is connected to different input terminals of the NAND circuit 190, and its output terminal is connected to the input terminal P2 of the multiplexer 186.
It is connected to the. Lines L92 and L94 are connected to different input terminals of a NAND circuit 191, whose output terminal is connected via an inverter 192 to an input terminal P4 of a multiplexer 186. Lines L94 and L95 are connected to different input terminals of a NAND circuit 193, and the output terminal thereof is branched into two, with one branch end connected to the multiplexer 18.
The other branch end is connected to the input terminal P3 of the inverter 194. The output terminal of this inverter 194 is connected to the input terminals P3 and P6 of the multiplexer 185. line L90
, L93 are connected to different input terminals of the NAND circuit 195, and their output terminals are connected to the input terminals P5, P6 of the multiplexer 186 and the input terminal P5 of the other multiplexer 185.
and are commonly connected. Lines L90 and L95 are connected to different input terminals of a NAND circuit 196, whose output terminal is connected to a multiplexer 185 via an inverter 197.
is connected to input terminal P4 of. Output line L81 of the least significant bit of the third address counter 142
Line L96 derived from multiplexer 186,
187 input terminals PI. Furthermore, the line L96 is connected to the input terminal PI of the multiplexer 185 and the input terminal P4 of another multiplexer 187 via inverters 98 and 199, respectively. Also,
A line L97 connected to the low potential terminal is connected to each input terminal P7 of multiplexers 185 and 186, and is also commonly connected to input terminals P0 and P7 of other multiplexers 187. Line L98 connected to high potential terminal 200 is input terminal P0 of multiplexer 185.
, P2, the input terminal PO of the multiplexer 186, and the input terminals P5 and P6 of the multiplexer 187. Further, the multiplexers 185, 18
6,187 selection input terminals L1, L2, L4 are connected to lines L21, L21, L4 from the selection code holding circuit 124, as described above.
A selection code is provided via L22, L24, and each multiplexer 185, 186, 1
87 respective bid negation output terminals Y21n, Y22n,
Y23n has the input terminal PO specified by the selection code.
Bits are generated by negating the bit contents from any of the bits from any of P7 to P7, and these bits are input to the lower three bit input terminals of the bit input terminals X21 to X24 of the third DA converter 201, respectively. The line L98 connected to the high potential terminal 200 is connected to the bit input terminal X of the most significant digit.
24. In the third semiconductor memory device 182 having the above configuration, the line L98 generates the leftmost and most significant bit of the four bits in the "thread tension information" column of FIGS. generates the least significant bit. As is clear from FIG. 17, each piece of yarn tension information is composed of four bits, and one yarn tension information group is created by gathering six pieces of yarn tension information, and these yarn tension information groups are shown in FIG. A
Eight pieces are created corresponding to the different types of stitch patterns shown in . The third address decoder 183, the information setting circuit network 188, and the third O-A converter 201 collectively determine the thread tension strength corresponding to each stitch pattern by the thread tension plate 56, 57 constitutes a thread tension command circuit that generates an electrical signal to be controlled.
The third multiplexer group 184 responds to the operation of the pattern selection device 121 (lines L21, L22, L
24) corresponds to a signal selection circuit that selects a thread tension command electric signal corresponding to the selected stitch pattern. In this embodiment, the specific contents of each piece of thread tension information shown in FIG. 17 include the descending position of the sewing needle 9 and its swing amplitude, the feed direction and feed increment of the work cloth, the type of stitch pattern, etc. It is determined by comprehensive consideration, that is, in relation to the oscillation amplitude information and the feed information group.Thus, the optimal thread tightness for each stitch pattern is determined regardless of the type of stitch pattern. Each stitch in the same stitch pattern is predetermined so as to obtain a uniform thread weave. The numbers shown in the "thread tension" column in FIG. 17 are numerical representations of the degree of thread tension to be applied to the sewing thread for convenience. Among the eight yarn tension information groups, each yarn tension information in one yarn tension information group specified by the selection code output from the selection code holding circuit 124 is as follows:
According to the counting operation of the third address counter 142, the information is sequentially outputted to the third D-A converter 201, and an analog value is outputted here according to the code content of each thread tension information. The signal is converted into a DC voltage signal, for example, 3, and is output to the analog output terminal X02 of the DA converter 201. A variable voltage dividing resistor 202, which is an electrical signal adjustment circuit to which the DC voltage E3 is applied, is connected to the analog input terminal One of the fixed strands a is connected to a low potential terminal via another variable voltage dividing resistor 204 for an electrical signal adjustment circuit. The sliding terminal 284a of the variable voltage dividing resistor 204 is connected to the other fixed saddle piece b of the manual automatic switching switch 203 for thread tension, and this connection point is connected to the constant current circuit 206 via the lead wire 205. It is connected to the plus input terminal of operational amplifier 207. The operational amplifier 2071 is used to control the amount of power supplied to the thread tension electromagnetic actuator 52 in cooperation with the transistor reed 08, and the collector of the transistor 208 is connected to a freewheel diode 209 in parallel. The thread tension electromagnetic actuator 62 is connected to a high potential terminal 2101 via the auxiliary switch 67, and a spark extinguishing capacitor 211 is connected in parallel with the auxiliary switch 67. The emitter of the transistor 208 is connected to the negative terminal of the operational amplifier 207, while the resistor 21
2 to the low potential terminal, and the base is connected to the resistor 2
08a to the output terminal of the operational amplifier 207. Here, operational amplifier 207 and transistor 2
08 constitutes the control circuit 213 that controls the power supplied to the electromagnetic actuator 52 as described above, and the resistor 21
The above connection of 2 forms the constant current circuit 206 within the control circuit 213. Next, to describe the control circuit for the needle hole switching device shown in FIGS. 8 and 9, in FIG.
, lines LIO1, LI02, L]04 derived from the same parts as the lines L21, L22, L24 of FF4.
are connected to different input terminals of a NOR circuit 215, and the output terminal thereof is connected to an input terminal of an inverter 216. The line LI02 is connected to the input terminal of the inverter 217, and the output terminal of the line LI02 and the line L
I02 and LI04 are connected to different input terminals of the NAND circuit 218, and lines LIO1, L wing 02, and LI0 are connected to different input terminals of another NAND circuit 219, respectively.
4 are connected. The various output terminals of the inverter 216 and the NAND circuits 218 and 219 are connected to different input terminals of another NAND circuit 220, and the output terminal thereof is connected to the signal output mode 221a. The output terminal of the NAND circuit 219 is connected to another signal output terminal 221b via an inverter 222. One of the signal output terminals 2218 is connected to the base of a transistor 226 through a diode 224 of the polarity shown in the needle hole driver 223 and a resistor 225, and is connected to the base of a transistor 226 through the second electromagnetic solenoid 88. and is connected to the high potential terminal 221. The other signal output terminal 22ib is branched into two, one branch end of which is connected to the cathode side of the diode 224 via a diode 228, and the other branch end is connected to the cathode side of the transistor 231 via a diode 229 and a resistor 230. It is connected to the base, and also connected to the high potential terminal 227 via the first electromagnetic solenoid 87 outside the base. Above electromagnetic solenoid 8
A freewheeling diode 232 is connected in parallel to each of transistors 226 and 226, and
The emitter 31 is connected to the low potential terminal. According to the gate circuit 214 having the above configuration, the pattern selection switch SO
Pressure closing of S7 to S7 and signal output terminals 221a, 221
The logical sign of the bit of b and each transistor 226, 23
The relationship between on and off of 1 is as shown in FIG.
Therefore, as is clear from FIG. 18, when the pattern selection switches S1, S2, S3, S4, and S6 are selectively opened, both the electromagnetic solenoids 87 and 88 are in a power-off state, and the pin 115 of the operating birch strip 01 is turned off. is the position MPM, and based on the same principle, when the pattern selection switch SO$S5 is selected and closed, pin 115 becomes the position M circle 1, and the pattern selection switch S7
When the pin 115 is selectively closed, the pin 115 is in the position M circle 2. In this sewing machine configured as described above, each of the eight swing amplitude information groups, the feed information group, and the thread tension information group are stored in the selection code holding circuit 12 by the operation of the pattern selection switches SO to S7.
The selection codes output from 4 are combined as shown in FIG. 17 to correspond to the different types of stitch patterns. Then, from among the above three information groups corresponding to one stitch pattern, a set of oscillation amplitude information regarding one stitch formation, feed information, and thread tension information is sent to the address counters 140, 141, and 142, respectively. The data are sequentially read out in accordance with the counting operation, thereby performing desired control. The effect will be explained in detail below. Now, the yarn tension manual stitch movement changeover switch 203 has been switched to the automatic control side TAU, and the switching switches 172 and 173 in the feeding manual movement changeover switch device 171 have been switched to the automatic control side CAU.
Assume that it has been switched to . Further, in order to form the cross-hatched pattern shown in FIG. 16G, the pattern selection switch S6
Suppose that they form a cluster. The formation principle of this cross stitch pattern is as follows from the number (0) given in the stitch pattern in Figure 16G to {5'
If one unit is to form stitches in this order up to the number, this means that multiple units are repeated, and it is clear from Fig. 17G, which shows the control details for this one unit of pattern formation. The descending position of the sewing needle 9 to form each stitch from number (0) to [51] is determined by the needle position coordinates ■,
(0),■,■? (15), OQ. In addition, in the feed increment, since the formation of stitch number (0) is performed successively after the formation of stitch number {5}, the formation of stitch number (■) is followed by the formation of stitch number {5}.
The feed increment (-5) for stitch number 0) is given, and the feed increment is based on the above needle position coordinates ■, (0), '51, OQ, (
15), ■Feed increment (15), (15) corresponding to (15), respectively
, (15), (15) (15), (15).
Furthermore, at ~ thread tension, the formation of stitch number (0) is similar to that of stitch (5).
), the thread tension ■ related to the general rule of number (0) is given after the formation of the stitch number t51, and therefore the thread tension is t8', ■, OQ in the order of the stitches.
, ■, (11), (11) are given. In this way, the needle position thin coordinates, feed increment, and thread tension are given, and the 16th
The cross-hatched pattern shown in Figure G is formed. The specific effects of this control will be described below. That is, pattern selection switch S
6, the assumed numerical value [6}' is converted into a binary code by the encoder 123 and stored as a selection code in the selection code holding circuit 124, and the selection code is transmitted through lines L21, L22, L24, etc. to selection input terminals L1, L2, and L4 of multiplexers 148 to i51, 161 to 164, and 185 to 187 in the first semiconductor storage device 144, the second semiconductor storage device 158, and the third semiconductor storage device 182 through Therefore, among the input terminals PO to P7 of each multiplexer 148 to 151, 161 to 164, and 185 to 187, one input terminal corresponds to the numerical value '6 which is the content of the selection code. P6 is specified, and the bit contents of the input terminal P6 are output to each bit output terminal Y.
j to Y49 Y quantities to Y tome 4 and bit negation output terminals Y21n to Y23n' are in a state of being output.
On the other hand, the first to third address counters 48, 1, 2 are reset by the reset pulse RSP accompanying the opening of the pattern selection switch S6, and their address codes are ``000''. In addition, the pattern selection switch S6
By opening the line LIO as in the case of the selection code
1, LIQ2, and the upper wing 84' are "QII" in this order, and as shown in Figure 8, the "signal output terminals 221a, 22
1b are both "0", so the transistor 226,
231 are both off and the first and second electromagnetic solenoids are installed? Both plungers 89 and 98 of the fin 8 are retracted, and as a result, the pin 15 of the fin 8 is moved to the M position.
PO' is located so that the machine hole 105 of the throat plate 103 is inserted into the sewing needle 9.
located within the lowering position. In the above state, when the sewing machine is started with a counterfeit needle, for example, the output (address code) of the first address counter 4Q is "000", and especially the output line L41 is the logical code "0". ”, so “first semiconductor memory device 4
Since the trine L52 becomes "1" in &, the bit content of each input terminal P6 of the multiplexer turtles 48 and 150 becomes "rl", which is transmitted to the respective bit output terminals Y9 and
It is output as is to Y3 and the address code is “0”.
00'', the first address decoder 145
Of the addressing terminals DO to D5, only the - addressing terminals DO are rOJ and the others are "1", so
Lines L54, L55, and L56 are all "1", and the output of the NAND circuit 154 is "0". Therefore, the bit contents of the input terminals P6 of the multiplexers 14g and 151 are "1".
0'', which are output as they are to the respective bit output terminals Y2 and Y4. Therefore, if the count value of the first address counter 40 is (0) in decimal, then the bit output terminals Y4 and Y3 of the first multiplexer group 147
, Y2, and YI, the code contents of the bridge service amplitude information are "0101" from the most significant digit. Based on the code content, the first D-A converter 155 outputs a DC voltage rainbow having a value specific to the code content, and adds it to the positive input terminal of the first comparator 156. Vessel-56
compares this DC voltage with the feedback voltage 82 from the potentiometer 48 (voltage with a value corresponding to the current position of the drive link 12), and applies the diamond voltage E3 to the coil 33 in the amplitude control actuator 14. As a result, the bobbin 34 of the amplitude control actuator 14 moves in the direction according to the magnetism of the differential voltage P3 until the differential voltage P3 becomes zero, and the drive link amount 2 is adjusted so that the lowering position of the sewing needle 9 is the needle. The stitch number (0) is formed at the position of the needle position coordinate '5) by controlling the position to be at the position coordinate 51. After this, sewing needle 9
When the timing pulse BCP reaches a position above the throat plate upper surface 135, the pulse CP2 generated at the falling edge of the first timing pulse BCP
(time TI) is counted by the first address counter 140, and the code content is changed from the most significant digit to "001",
Therefore, the potential of only lines L51 and L52 of each line in the first semiconductor memory device turtle 44 is inverted, and the other lines remain at the same potential as when forming the stitch No. 0). Since the code becomes "0", the multiplexer also becomes "0" as the bit content of each of the 48,358 input terminals P6. In addition, other multiplexer turtles 49,1
The bit contents of each input terminal P6 of 51 are unchanged and set to “0”.
It remains as it is. Therefore, when the first address counter 140 is changed to {1} in decimal notation, the code content of the swing amplitude information output from the bit output terminals Y4, Y3, Y2, YI of the first multiplexer group 147 is "0000J". Since this means the needle position coordinate (0), the next stitch No. 1' will be formed in this garden layer. The sewing needle 9 descends from above the throat plate 103 to form the stitches on the top surface 13 of the throat plate 103.
5, the second and third address counters 41 and 142 count the pulse CP3 generated at the falling edge of the second timing pulse FCP (these address counters 1 4 19 1 42 The count content is one step ahead of the address counter 140 of Kanoichi.) Then, the count content is converted into a decimal number and the code content is changed from "000" to "001". Among these, the second address decoder 159 of the second semiconductor memory device 158 which receives the output "001" of the second address counter 141 as an address code has its address designation terminal D.
Among O to D5, only the address designation terminal DI changes to a logic code "0" and the others change to "1". Therefore, when focusing on the input terminals P6 of the multiplexers 161 to 164 designated by the selection code, first, the output address designating terminals A0,
Since D3 is both "1", it becomes "0", and line L71 becomes "r1", so the multiplexer 163,
According to the input terminal P6 of 164, each bit output terminal Y
Since the bit contents of 13 and Y14 are "1" and the inverter 176 receives a low level potential through the bush (ca) of the changeover switch 172 and outputs "1", the NAND The circuit 177 has two inputs “0” and “1”.
” and outputs “1”, and input terminal P6 of the multiplexer 162 which receives this via the inverter 178 outputs “1”.
0” and the bit content of the bit output terminal Y12 becomes “
0". In addition, the input terminal P of the multiplexer 161
6 is always open and is "1", so the bit content of the bit output terminal YII is always "1". In this way, when the count content of the second address counter 141 is '1' in decimal notation, the code content of the sending information output from each bit output terminal Y14, Y13, Y12, YII of the second multiplexer 160 is the highest. “1” in order from the high-order digit
101'', which means that the feed increment prior to forming the stitch number [1} is (15) ~ the DC voltage E, . is generated by the second DA converter 165 and applied to the positive input terminal of the second comparator 180 via the saddle (ca) of the changeover switch 173. This first comparator 180 has its DC voltages E, . and the feedback voltage E,2 from the potentiometer 46, and the difference voltage E,3 is supplied to the coil 33 of the feed control futurator 28 via the feed control driver 81. As a result, the bobbin 34 is moved in a direction according to the polarity of the differential voltage E,3 to a position where the differential voltage E,3 becomes zero, and thereby the adjustment village 26 is controlled, and the feed dog 23 is moved as shown in FIG. In the period indicated by 136, that is, the formation of the stitch number (0) is completed, and the sewing needle 9 is located approximately near the needle top dead center (between T2 and T3), the next stitch (number 11) is formed. Prior to this, a feed increment (15) is applied to the work cloth. On the other hand, as described above, the third address counter 142 whose count content has been changed by 1 along with the second address counter 141 supplies the signal "001" as an address code to the third address decoder 183. , among the addressing terminals DO to D5, only the terminal DI is "0" and the others are "1". Therefore, the output of the NAND circuit 193 becomes "0", the output of the inverter 194 becomes "1", and the bit content of the input terminal P6 of the lowest digit multiplexer 185 in the third multiplexer group 184 becomes "1", and that bit becomes "1". Negative output terminal Y21
The negation, "0", is output to n. Further, since the output of the NAND circuit 195 becomes "0", the bit content of the input terminal P6 of the multiplexer 86 becomes "0", and "1" is outputted to the bit negation output terminal Y22h. In addition, the input terminal P6 of the multiplexer 187 is always set to "1" by the line L98 connected to the high potential terminal 20.
Therefore, "0" is output to the bit negation output terminal Y23n. These bit negation output terminal Y2
The outputs of 1n, Y22n, and Y23n are supplied to the bit input terminals x21, x22, and X23 of the third DA converter 201, and the most significant digit bit input terminal is given, so in the end, the third DA converter 201 is connected to the third semiconductor memory device 1.
The code content of the thread tension information output from 82 is the 17th
Corresponding to the "Counter value" column {1} in Figure G, "iolo
” (equivalent to thread tension degree 10), which is (0)
It is used as an electric signal to command the strength of the thread tension for tightening the number (0) stitch in approximately the same period as the period (between T2 and T3) after the formation of the number (0) stitch. That is, the yarn tension information "1010" is transmitted to the third DA converter 2.
01', it is converted into a DC voltage E3, which has an analog quantity specific to the code content, and this is applied from the analog output terminal X02 to the variable voltage dividing resistor 202, and a DC voltage E32 proportional to it is applied to the sliding terminal 202a. The voltage is applied to the positive input terminal of the operational amplifier 207 in the constant current circuit 206 via the contacts (c and b) of the manual automatic changeover switch 203 for thread tension. Then, the operational amplifier 207 outputs a rhombic voltage E34 to which the DC voltage E applied to the negative terminal (described later) is applied, and applies this to the base of the transistor 208 via the resistor 208a, so that the collector current depends on the rhombic voltage E34. is supplied to the electromagnetic actuator 52 for the thread regulator. In this way, the amount of V power supplied to the electromagnetic actuator 52 is controlled by a control circuit consisting of an operational amplifier 207, a transformer, and a resistor 288 in response to the electrical signal (E3,) output from the third DA converter 291. be done. The electromagnetic actuator 52 generates an attractive force depending on the value of input power, and the plunger 64 moves in the direction of the arrow 233 in the turtle diagram. Therefore, the plunger interlocking lever 3 is rotated clockwise around the stepped screw 64, and one end 63 thereof is rotated clockwise.
a presses and moves the push rod 68 in the direction of arrow 234, and t causes one thread tension 56 to change to the other thread tension tension? When pressed, the upper thread interposed between these thread tension discs 69 and 67 is given a thread tension degree according to the thread tension information "1010".
After the stitch number (0) is formed, the thread tension is applied to tighten the stitch. By the way, as mentioned above, the strength of the thread pulling force for tightening the seams is determined by the thread tension information according to the type of seam pattern, which is stored in advance in the third semiconductor storage device Gunha 2. However, the third D-A
Analog output terminal XQ2 of converter 281 Kachirimisaki line 2
This thread tension information (magnitude of the electric signal) given to the operational amplifier 207 via 85 can be adjusted by moving the base motion filter 2a of the variable voltage dividing resistor 282, which is an electric signal adjustment circuit. A color pattern is formed by changing the preset thread tension strength depending on the type of seam pattern, sewing conditions such as fabric thickness and thread thickness, or by changing the colors of the upper thread and bobbin thread. It can be adjusted according to special stitches such as
Therefore, the thread tension can be set to an optimum value in accordance with more factors involved in the sewing operation. The "amplitude information" in Fig. 7G, which has been enabled by the pattern selection switch S6 as described above, also fluctuates from among the three information groups shown in the "feed information" and "thread tension information" columns. Timing pulses BCP and FC that are a set of amplitude information, feed information, and thread tension information
By sequentially reading out the information by P, each stitch for the cross stitch pattern is formed in accordance with the information contents from numbers (0) to '5' under the optimum thread tension state. And, especially, "Since the first to third address force counters are hexadecimal counters, the counting contents are rooo when the stitches from number (0) to side number are formed." By repeating the counting process, the same lattice pattern is repeatedly formed in succession. The control operations regarding other types of stitch patterns shown in FIGS. 17A to 17F and the table are also the same as those described above, and therefore their explanations will be omitted. Next, the reason for the existence of the constant current circuit 206 will be explained.The electromagnetic actuator 52 for thread tension is continuously energized while the sewing machine is sewing work cloth, so the temperature of the winding increases and the internal resistance increases. However, the current supplied to the winding changes to a current value different from the current value corresponding to the thread tension information, and the thread tension also changes. However, changes in the winding current due to resistance changes due to temperature rise in the windings appear as fluctuations in the terminal voltage E33 of the resistor 2 in Figure 4, and this terminal voltage E unevenness is caused by the negative voltage of the operational amplifier 2. By being applied to the terminal, the base current of transistor 2Q8 is controlled in a direction that suppresses changes in the collector current due to a rise in temperature of the winding. In this way, a constant current corresponding to the thread tension information is supplied to the thread tension electromagnetic actuator 52 regardless of the temperature change of its winding, thereby ensuring a desired thread tension level.
Next, the hand-operated sliding door switch device for feeding is the IT amount of the operation switch 1725. 3 is switched to MA on the manual control side so that the gap (c-b) is in the open state. When this switching state is established, the output of the inverter 76 is always "0". So it's Tonando Circuit Wing? 7 is always "1" regardless of the contents of the address code output from the second address counter 141.
Well, it is always "0", and on the other hand, the L line L73 is also always kept "1" by the changeover switch 1-2, so the input state of the multiplexer 161 is PQ, P1, P2, P4,
Input terminal PQ of multiplexer S62, PI9 P3
? P7, and input terminals P2 and P of multiplexer 163
4 is always set to "1", and furthermore, among the input terminals PO to P7 of the L multiplexers 161 to 6 turtles, there are terminals that are always set to "1" because they are open terminals. "Pattern selection switches S0, S1,
When S29S and S7 are selectively closed, the bit output terminals Y14 and Yi of the second multiplexer group 160
33Y12, the code content of the sending information output from the YI turtle is always "1111" regardless of the counting content of the second address counter 41, and the corresponding DC voltage, 4, is the second D-A. Analog output terminal X of converter 165
It is output from OI and applied between the terminals of variable voltage dividing resistor 179. Therefore, the Numamoto terminal 17 of the variable voltage dividing resistor 179
9a is manually adjusted, the divided voltage determined by this adjustment is applied to the positive input terminal of the second comparator 180 via the rear piece (c and b) of the changeover switch 73, and The feed control of the work cloth is based on manually adjusted feed increments. Further, when the manual automatic switching switch 203 for thread tension is switched to the manual control side TMA, a voltage depending on the position of the foundation element 204a of the variable voltage dividing resistor 204 is applied to the positive input terminal of the operational amplifier 207. Therefore, by manually adjusting the sliding terminal 204a of the variable voltage dividing resistor 202, the optimum thread tension can be adjusted according to the sewing conditions and special sewing circumstances, as in the case of using the variable voltage dividing resistor 202 described above. Obtainable. In this sewing machine, the electric power supply to the thread tension electromagnetic actuator 52 is cut off when the presser foot of the intermediate presser device is raised. That is, when the presser foot lifting cam 77 shown in FIGS. 3 to 5 rotates the presser foot lifting lever 81 clockwise in FIG. At the same time as the thread 76 is raised and the presser foot (not shown) is raised, the rotary lever 82, whose one end 82a abuts and engages the upper surface of the cam receiving plate 79, rotates around the stepped screw 83 as shown in FIG. It is rotated clockwise, and the other end 82b presses and moves the end 71b of the switch opening/closing lever 71 in the direction of arrow 235 in FIG. As a result, the switch opening/closing lever 71 is rotated counterclockwise in FIG. 4 to separate its one end 71a from the actuator 75 of the auxiliary switch 67, turning the auxiliary switch 67 into the OFF state. As a result, the thread tension control actuator 52 is de-energized, and the tension applied to the upper thread is released. Therefore, the ease of changing the direction of the work cloth, attaching and detaching the work cloth, etc. is ensured. Next, the significance of the existence of the delay circuit 137 will be explained. That is, as is clear from the foregoing, the feed information and thread tension information are read out by the pulse CP3 generated at the instant T4 when the sewing needle 9 descends from the needle top dead center and pierces the workpiece cloth. The principle is that the feed information serves as information for the feed movement prior to forming the next stitch, and the thread tension information serves as information for tightening the stitch that is currently being formed. Now, if any of the pattern selection switches SO to S7 is selectively closed while the sewing needle 9 is stuck in the workpiece cloth for some reason, a signal is generated at the reset output terminal 132 at this time. Suri set pulse RSP
Accordingly, the first to third address counters 40, 14
1,142 is reset to the decimal (0) state. However, "the reset pulse RSP is delayed for a certain period of time by the delay circuit 137, and the -th timing pulse BCP
(from time TO to time TI shown in FIG. 15)
) is applied to the NAND circuit 139 via the inverter 138. During this period, a signal that temporarily falls to a low level is generated from the output terminal of the NAND circuit 139. Three address counters 1
The count code content of 41,142 is "001" from the most significant digit.
”, and as a result, the feed information and yarn tension information are read out as described above. In this way, a constant time relationship for readout between feed information and thread tension information and swing amplitude information is maintained as scheduled. It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways without departing from the spirit of the invention, for example, information may be stored as magnetic signals. It is. As is clear from the above embodiments, the present invention has a pattern selection device 121 for selecting a desired pattern from among a plurality of predetermined stitch patterns, and a sewing machine that forms the selected pattern. an electromagnetic solenoid 52 having a plunger 54 operatively connected to a thread tension member for applying thread tension to the sewing thread and movable within a predetermined range of movement; Thread tension command circuit 183 capable of generating a plurality of preset electric signals corresponding to the plurality of types of stitch patterns, respectively.
, 188, 201, and a signal selection circuit 184 responsive to operation of the pattern selection device to select an electrical signal corresponding to the selected pattern from among the plurality of electrical signals;
A control circuit 2 that controls the amount of power supplied to the solenoid 52 according to the electrical signal selected by the signal selection circuit.
06 to 208, and adjustment circuits 202 and 204 for adjusting the electrical signals supplied to the control circuits, and as a result, a plurality of predetermined stitch patterns The optimum thread tension for each pattern is automatically set in relation to the selected pattern, making the operation easy to use.Also, as mentioned above, the adjustment circuits 202 and 204 are provided, so that the thread tension can be adjusted to suit the pattern selection. The automatically determined setting values can be adjusted based on factors other than the pattern, such as sewing conditions such as fabric thickness and thread thickness, or when forming a colored pattern by using different colors of upper thread and lower thread. It is possible to adjust the thread tension according to special stitches, etc., so that the set thread tension can be set to an optimal value according to more elements of the sewing work.Furthermore, in the present invention, the thread tension is The range of movement of the plunger is set so that the force acting on the adjustment member depends only on the amount of current supplied to the solenoid 52 and does not depend on the position of the plunger 54.
Yarn tension can be controlled over a relatively wide range with a single electromagnetic solenoid, making the device more compact and having the characteristic that the yarn tension does not shift to the plunger position, making it possible to maintain yarn tension higher than the command value. Fidelity can be controlled below.

[Brief explanation of drawings]

The drawings relate to one embodiment of the present invention; FIG. 1 is a perspective view of the internal structure of a sewing machine showing only parts related to the present invention, FIG. 2 is an exploded perspective view of an actuator, and FIGS. 3 to 5. The figures are a side view, a top view, and a front view of the thread tensioning device, FIGS. 6 and 7 are a plan view and a front view of the electromagnetic solenoid device part in the needle hole switching device, and FIG. 8 is a plane view of the throat plate part. 9 is a plan view of the needle hole switching portion, and FIG. 10 is a block diagram for explaining the horizontal swing amplitude control of the sewing needle, the feed control of the work cloth, and the thread tension control.
1 is a circuit configuration diagram mainly showing a selection device portion and an electromagnetic solenoid drive portion, and FIGS. 12 to 14 are circuit configurations showing a first semiconductor memory device to a third semiconductor memory device, respectively, together with their associated circuits. 15 is a time chart for explaining the embodiment, FIG. 16 is a diagram showing different types of stitch patterns, FIG. 17 is a diagram showing control details for each stitch pattern, and FIG. It is a figure for explaining operation of the first and second electromagnetic solenoids. In the drawings, 5 is an upper shaft, 6 is a lower shaft, 7 is a main pulley, 8 is a needle swing device, 9 is a sewing needle, 10 is a swing support, 12 is a drive link, 14 is an amplitude control actuator, and 25 is a swing support. Feed device, 16 is a feed drive shaft, 19 is a cam holding shaft, 20' is a shaft, 23 is a feed tooth, 24 is a grooved member, 24a is a lock shaft, 24b is a lock arm, 26 is an adjustment punch, 28 is a feed control Actuator, 30 is a permanent magnet plate, 33 is a coil,
34 is a bobbin, 44 is a rotating wheel, 46 is a potentiometer, 47 is a sliding shaft, 48 is a potentiometer, 49 is a pulse generator, 51 is a thread tension device, 52 is a thread tension control actuator, 54 is a plunger, 56, 57 60 is a push rod, 63 is a plunger interlocking lever, 67 is an auxiliary switch (opening/closing device), 68 is a processing cloth presser, 71 is a switch opening/closing lever, 76 is a presser bar, 77 is A presser foot lifting cam, 79 a cam receiving plate, 82 a rotating lever, 87 and 88 first and second electromagnetic solenoids,
93 is a connecting plate, 94 and 95 are stoppers, 96 is a ladder bar,
101 is an operating rod, 103 is a throat plate, 105 is an oblong hole, 10
6 is a round hole, 111 is an intermediate lever, 15 is a pin, 121
'ma selection device, 122 is a group of pattern selection switches, 123 is an encoder, 124 is a selection code holding circuit, turtle 31 is a waveform conversion circuit, BCP is a first timing pulse, FCP
is the first timing pulse, SO to S7 are the pattern selection switches, 137 is the delay circuit, 140 is the first address counter (readout device), 141 is the second address counter (readout device), and 142 is the third address counter (readout device), 143 is a pulse distributor, 144
1 is a first semiconductor memory device, 146 is an information setting circuit network, 1
45 is a first address decoder, 147 is a first multiplexer group, 148 to 151' are multiplexers, 1
55 is a first DA converter, 156 is a first comparator, 1
57 is an amplitude control driver, 158 is a second semiconductor memory device, 159 is a second address decoder, 160 is a second multiplexer group, 161 to 164 are multiplexers, 165 is a second DA converter, 166 is a second multiplexer group Information setting circuit network "171 is a manual movement changeover switch device for feeding, 17
9 is a variable type partial rolling shaft. 18 Kawama second comparator, 181
182 is a third semiconductor memory device, 183 is a third address decoder, 184 is a third multiplexer group, 185 to 187 are multiplexers, 188 is an information setting circuit network, 201 is a third D -A converter, 202 is a variable voltage dividing resistor, 203 is a manual changeover switch for yarn tension, 204 is a variable voltage dividing resistor, 206 is a constant current circuit, 207 is an operational amplifier, 208 is a transistor, 213 is a control The circuit 214 is a gate circuit.
Fig. 2 Fig. 4 Fig. 6 Fig. 7 Fig. 3 Fig. 5 Fig. 8 Fig. Millet 9 Fig. 10 Fig. all bundling 12 Fig. Dormitory 13 Fig. 14 Fig. 15 Fig. 16 Fig. 17 [A ) Figure 17 (B) Figure 7 (C) Figure 7 (D) Figure 17 (E) Figure 17 (F) Draft Figure 17 (G) Figure 7 (H) Figure 18

Claims (1)

[Claims] 1. In a sewing machine that has a pattern selection device 121 for selecting a desired pattern from among a plurality of predetermined stitch patterns, and that forms the selected pattern, a thread is used to apply thread tension to the sewing thread. an electromagnetic solenoid 52 having a plunger 54 operatively connected to the tension member and movable within a predetermined movement range; Yarn tension command circuits 183, 188, 201 capable of generating a plurality of preset electrical signals, and operation of the pattern selection device to select an electrical signal for the selected pattern from among the plurality of electrical signals. A signal selection circuit 184 that responds; control circuits 206 to 208 that control the amount of current supplied to the electromagnetic solenoid 52 according to the electrical signal selected by the signal selection circuit; and control circuits 206 to 208 that adjust the electrical signal supplied to the control circuit. adjustment circuits 202 and 204, and the movement range is such that the force acting on the thread tension member from the electromagnetic solenoid 52 depends only on the amount of current supplied to the solenoid 52 and does not depend on the position of the plunger 54. A thread tension device for a sewing machine, characterized in that: