JPS6015357B2 - Sewing machine control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a sewing machine having two needles arranged at a predetermined interval on the left and right sides, and more particularly to a device for automatically performing a predetermined corner stitch using this sewing machine. It is something.

When performing corner stitching on the corners of cloth using a double-needle sewing machine, for example, as shown in Tokusei Publication No. 1846/1980, the seam formation with the outer needle is performed using an electric circuit or the like. In a sewing machine that automatically controls the sewing machine to perform a predetermined number of stitches, the inner needle is stopped by operating a lever, and then an electric circuit is activated by depressing the pedal later, and the sewing machine automatically starts sewing after the predetermined number of stitches have been sewn. The operator stops the sewing machine, turns the fabric, then presses the pedal again to sew the specified number of stitches, and then automatically stops the sewing machine. This method has disadvantages such as universal sewing with a real needle, which makes the work complicated and reduces work efficiency.

The present invention aims to eliminate the disadvantages of the above-mentioned subsystems.

An embodiment of the present invention will be described with reference to the drawings. A main shaft (not shown) rotatably supported on a machine frame 1 of the sewing machine head is driven by a belt 2 passed between the back and a driving part (not shown). Pulley 3 rotates the main shaft in conjunction with
is fixed, and a needle position detection diamond taka 4 is provided at the rear end of the main shaft to detect the main shaft rotation angle corresponding to the vertical position of the needle bar, which moves up and down once for each rotation of the main shaft.

The needle position detection device 4 is designed to detect a rotation angle slightly ahead of the top dead center of the needle. Needle birches 6a and 6b with needles 5a and 5b fixed to the lower ends of each weaving are arranged left and right orthogonal to the cloth feeding direction, and supported on the jaw part 7 so as to be movable up and down in conjunction with and synchronized with the main shaft, The pause mechanism 8 marked with the mark 3, which normally receives an acting force that maintains it in an inactive state, becomes active, so that one of the left and right needles 6a, 6b is appropriately disconnected from the main shaft, and the upper end is stopped. It is possible to hold it in a dormant state before turning on. One end of the support ball 9, which is rotatably supported at the machine frame angle around a fixed straight line parallel to the cloth feeding direction, is connected to the pause mechanism 8, and the tip is placed at the end of the shaft. Fix the base of the lever 10 to be placed forward, and move the lever 1 around the support shaft 9.
0 to one side. When turning clockwise in Figure 1, turn needle Sa on the left side in Figure 1, and when turning the counterclockwise in all directions, turn needle 6b on the right side in Figure 1. The pause mechanism 8 is activated to put it in a resting state, and when it is placed in an intermediate position between the clockwise direction and the counterclockwise direction, the resting mechanism 8 is deactivated so that both the left and right needles 6a and fins 6a and 5b are in the operating state. A cam plate 12 is fixed to the rear of the connecting portion of the support shaft 9 with the stop mechanism 8, and a cam plate 12 is formed with a convex center portion at the tip to form a protrusion 11. The engaging body 1 is rotatably supported on the koji 13 parallel to the frame 1, and is always subjected to an acting force to the left in the movement diagram by a coiled spring 26 having one end fixed to the sewing machine frame 1.
4 is formed into a forked shape, and one side thereof is bent forward, and the inner end surface of the locking portion wing 5 is arranged opposite to the tip surface of the cam plate wing 2, and the lever 10 is in an intermediate position. Sometimes the engaging part 16
The inner end surface of the cam plate 12 is engaged with the protrusion 11 of the cam plate 12 to maintain the engaging body 14 in the right rotation position in FIG. 2 against the acting force of the coil spring 26. When it is rolled to the other position, it engages the notch portions 6a or 16b on both sides of the protrusion 11 of the cam plate 12, and the engaging body 14 is rotated to the left in FIG. The cam plate 12 is maintained in the rotational position against the force of the stop mechanism 8.
A permanent magnet 18 is placed on the other side 17 of the forked part of the grandchild assembly 14.
is fixed, and the engaging portion 15 is placed oppositely above the permanent magnet 18.
The magnetic sensing body 19, which senses the magnetism of the permanent magnet 18, is attached to the machine frame only when the engaging body 14 is rotated to the left in FIG. Fixed to 1. In addition, the support part 20 protruding to the side of the engaging body 14 fixes the tip of the plunger 23 of the crab magnet 22, which is activated by pressing the operation rod 21 arranged in front of the rock frame 1, and fixes the end of the plunger 23 of the crab magnet 22 when the electromagnet 22 is activated. The plunger is sucked and the engaging member turtle 4 is rotated to the right in FIG. 2 against the force of the spring 26 until the engaging portion 15 engages with the protrusion 111 of the cam plate 12. 24 is a dial for selecting a predetermined number of stitches to be formed using only one of the needles 5a or 50 during corner stitching. You can choose the number of stitches: one stitch, two stitches, four stitches, or eight stitches.
Further, 26a' indicates the state of automatic corner stitching by the counter. 25b is an indicator light that displays the state of manual corner stitching.

Next, the crab circuit of this embodiment will be explained.
c indicates a low current at a logical H level (hereinafter abbreviated as "day") when the power is turned on. Terminal Va is a power supply terminal to which high current for the magnet drive is supplied, respectively, and L
SW and TSW are operation switches that open and close in relation to the pedal operation, and the switch W is closed when the pedal is in the middle position and is opened when the pedal is in the front position, thereby transmitting the base input to the transistor T. The switch TSW is turned on and conductive, and the switch TSW is open when the pedal is in the middle position, and is open when the pedal is depressed at the rear position.

Further, RSW is a normal switch that opens when the operating lever 21 is operated with a weighing pressure. PS is a detection switch that detects the rotation angle corresponding to the needle up and down position of the main shaft of the sewing machine at the needle position detection register 4' and creates a closed circuit to generate an H level signal. B is a detection switch whose magnetic sensor blade 9 is permanently The sensing switch IR, which generates a logical L level signal (hereinafter abbreviated as L) when it senses the magnetism of the magnet 18, instantly goes L when the power is turned on.
This is an initial reset circuit that generates a signal that becomes H level after reaching the H level. CT is a binary IC counter having output terminals A to D, FFI to FF4 are known RS flip-flops, and TI to T3 each have a set time of Δtl to Δ0. GI to G21 are known IC NAND gates, BI to B
14 is a known IC inverter that inverts the logic of the input signal, EI to E4 are also known exclusive inverters, and D
I and D2 are light emitting diodes that emit light when an H level signal is input, and when emitting light, turn on the indicator lamps 25a and 25b, respectively. Y is an oscillation circuit that continues to oscillate switching pulses, and Z is the first and second stitches of dial 24,
Output terminals a and b corresponding to the four-hand and eight-hand selection positions in sequence
? It is a digital switch having terminals c, d and terminals e corresponding to manual selection positions, terminals a, b. c; Of d, only the output of the terminal corresponding to the number of stitches selected by dial 24 becomes L level, the others become H level, and dial 2
When terminal 4 is placed in the hand position and terminal e is selected, terminal a,
b, c, and d are all at the daily level. Ry is a relay coil with contacts that activates the low-speed motor that causes the sewing machine to commotion at a low speed, and MGB' is a crab magnet (that acts as a brake device that stops the sewing machine when activated).
Coil)~M・S is a flea magnet (coil) that acts as a safety device to prevent forward pedal operation when energized, M・Re is a flea magnet (coil) that rotates the engaging body ear to the right in Fig. 2 when energized. Electromagnet 2
2 (coils), and when each of the transistors Tr2 to Tr5 whose collectors are connected to each coil becomes conductive, a high current flows through the terminal Va to energize each coil. The number of stitches of the counter CT selected by the dial 24 is appropriately determined by the angles of the middle and corner stitches of the needles 5a and 5b. The present invention has the above-described configuration. When the power is turned on, the instantaneous L level of the initial reset IR causes the terminal 1 of the flip-flop FFI to become L, the terminal r of the flip-flop FF4 to become low, the terminal g to become low, and the terminals of the flip-flop FFI to become low. 1, the terminal ○ of the flip-flop FF3 is set to 1, and the terminal p is set to L.

The hands 5a and 5b are stopped directly at the upper layer (that is, at the upper layer detection position), and the H level upper counterfeit signal detected from the detection switch PS is sent to the inverter BI! is inverted by gate G
I7 becomes a day, and the L of the terminal p of flip-flop FF3 makes the gate GI8 a day. At this time, the lever 10 is rotated clockwise or counterclockwise to rotate the cam plate 12, and the engaging part 15 of the engaging body 14 is moved from the tip protrusion 11 of the cam plate 12 to the notch 16a or 16b. Engage and engage body 1
4 to the left in FIG.
detects the magnetism of the permanent magnet 18 and generates an L level signal from the sensing switch LS, which is inverted by the inverter B5.Even if the date is input to the gate G4, the signal from the sensing switch PS entering the gate G4 is L. Therefore, the gate G4 is kept at day, the terminal m of flip-flop FF2 remains at L, the terminal m remains at day, and the gates G3 and G9 are kept at day. Also, at this time, operate the operating shaft 21 with a scale pressure to switch RSW.
is closed and the input to gate G2 is set to day. Since terminal 1 of flip-flop FFI is L and gate GI is set to day, gate G2 becomes L, gate G3 is set to day, and monomulti T3 is triggered. Then, the Q output is set to L during Δ0, and the transistor Tr5 is turned on to energize the magnet M.Re. Therefore, if the lever 10 has been operated to the rotational position before the power is turned on, it can be returned to the intermediate position. (1) When the pedal is lightly pressed forward from the intermediate position, gate GI5 becomes L momentarily and flip-flop FF is activated.
3, terminal 0 is L, terminal p is 1, and flip-flop F
FI terminal] is set to 1, and this does not change until the pedal is pressed back and switch TSW is closed. At this time, even if the operating rod 21 is operated to close switch RSW, gate GI becomes L and gate G2 is set to 1. It is not possible to maintain the current and energize the magnet M.Re. When the pedal is pushed further forward, the clutch mechanism connects the low-speed motor to the high-speed motor, driving the sewing machine at high speed. When the pedal is moved to the neutral position from the front pedal operation position, when the hands 5a and 5b are in the lower layer, that is, when the lower layer signal of H level is generated from the detection switch OFF, gate G]8 becomes day and the gate is activated. GI9 is set to L, gate G20 is set to day, and it is inverted by inverter B14 to turn off transistor Tr2 ~ deenergize relay Ry to stop the low-speed motor, and trigger monomulti TI to set Q output to L for △tl. During this time, the transistor T
Turn on r3 to energize magnets M and B to stop the sewing machine at the lower layer of the needle. When the Q output of the monomulti TI returns to 1 after Δtl has elapsed, the gate G21 becomes L, and the terminal g of flip-flop FF4 is set to 1, and after a predetermined time delay, the terminal r is set to L.
Then, even if the L of this terminal r maintains the gate G20, and the gate GI9 changes, the gate G20 does not change. (0
) When dial 24 is selected from manual mode to automatic four-hand mode, the output of terminal abd of digital switch Z changes from HHHH to HH.
becomes LH, gate G6 becomes day, light emitting diode D
I is turned off to turn off the indicator lamp 25b, and at the same time, the light emitting diode D2 is turned on to turn on the indicator lamp 25a.

Also, on the day of gate G6, gate GI is set to L and gate G2 is
Since this is the date, press the operating rod 21 to turn the switch R.
Even if the SW is closed, the gate G2 remains unchanged. (m
) When the lever 10 is turned clockwise in FIG. 1, the needle bar 6b is pulled up to just before top dead center and held in the resting state by the resting mechanism 8, and the cam plate 12 is also turned clockwise so that the protrusion The engaging part 15 of the engaging body 14 separates from the 11, and the
The acting force of the counter 26 rotates the engaging body 14 to the left in FIG. 2 to engage the notch 16b of the cam plate 12, and a signal L (level) is generated from the sensing switch LS.

This moment is inverted by the inverter B5, and the gate G4 is set to L, so that the terminal m of the flip-flop FF2 is set to 1, and the state n is
becomes L, and the L of the state n is the terminal r of the flip-flop FF4, and as shown in FIG. On the day m, the gate G9 is set to L, and it is inverted by the inverter 871 to trigger the monomulti T2, and the Q output is set to L for △t2.
・Even if S is energized and the safety device is activated to prevent the front pedal operation, the sewing machine will not run at high speed. After the Q output of the monomulti T2 returns to day after passing △, the switching pulse from the oscillation circuit Y causes the gate GI0,
The transistor Tr4 is intermittently turned on via the GII to energize the magnet M.S and maintain the safety device in its operating state. Due to the L level of the gate G9, the gate GI9 becomes low, and the gate G20 becomes low, energizing the relay Ry and driving the sewing machine at low speed. Outputs A, 8, C to D of the counter CT, which input the lower signal from the detection switch that occurs intermittently as the main shaft rotates, are "HLLL" for the first stitch and "LHLLI1" for the second stitch. , the third stitch is "HHLL" and the fourth stitch is "LLHL", and the output terminals a, b?c, d of digital switch Z are "HHLM", so when counting the fourth stitch, the exclusive Noah E3 is becomes EI～E
4 all become days, and gate GI3 is set to L. Gate G
The Q and Q outputs of the flip-flop 8 with the L of I3 as the cleck input are inverted and become L, and the gate G9 becomes the low signal, and the gate GIO is output through the inverter B7.
By setting I to L, transistor Tr4 is turned off, magnets M and S are deenergized, and the safety diamond layer is rendered inactive. Also, the day of gate G9 is input to gate GI9, and when gate GI9 inputs the lower direct signal from the switch tower, it becomes L and gate G20 becomes day, turning off Tr2, deenergizing relay Ry, and monopolizing. Trigger multi TI and change Q output △
During tl, the transistor Tr3 is turned on and magnets M and B are energized to stop the sewing machine directly below the needle, and when the Q output of the mono multi-TI returns to H' after △tl elapses, the gate is turned on. G21 becomes L and flips. Tsubu FF
The output of terminal r of 4 is slightly delayed and becomes L, and the output of terminal r of gate G
Even if gate GI9 changes while keeping 20 days, gate G2
0 does not change. The Q output day of flip-flop ff and the day when 1 of gate GI3 is inverted by inverter B6 are the same as when gate G7 is set to L, gate G5 is set to day, and counter C is
It becomes the clear terminal input of T, clears the counter CT, sets the outputs of terminals A, B, C, and D to L to L, L, and 1, and returns the gate GI3 to H'. The presser foot is raised, the cloth is rotated by a predetermined angle around the needle 5b, and the presser foot is lowered again. At this time, n Isogo L of flip-flop FF2 becomes the input to gate GI6 and keeps gate GI6 constant, and even if the pedal is depressed and the switch TSW is closed, gate GI6 remains unchanged.
does not become L. Therefore, the terminal ○ of flip-flop FF3 does not become H - terminal p becomes L, so the needle cannot stop in the upper position. (W) From this state, lightly press the pedal forward to set the switch to W. When the signal is opened, the signal L (level) returns the terminal r of the flip-flop FF4 to the normal state, sets the gate GI9 to the normal state, sets the gate G20 to the low level, turns on the transistor Tr2, energizes the relay Ry, and drives the sewing machine at low speed. However, the safety device is disabled, so if you press the pedal further forward, the sewing machine will be driven at high speed by the high-speed motor.

The lower signal from the detection switch becomes input to the counter CT, and the counting starts badly. When counting the fourth stitch, the exclusive Noah EI to E4 becomes "day, day, day, H" and the gate GI
3 is set to L, becomes the cIMk input of flip-flop ff, inverts its Q and Q outputs, sets it to L, and gate G8.
becomes L due to this Q output day and the day from gate GI3, and triggers monomulti T3 by setting gate G3 to day, and Q output becomes L during △Q, and during this period, transistor Tr
5 to energize the magnet M・Re, and the electromagnet 22
Pull the plunger 23 to the right in FIG.
The magnetic sensor 19 stops sensing the magnetism of the permanent magnet 18, and as the signal of the sensing switch LS becomes positive, the cam plate 12 turns to the right against the force of the coiled spring 21. 8 is rotated in the counterclockwise direction in FIG. Therefore, the lever 10 also returns to the intermediate position, and the needle bar 6a, which has been at rest due to the inactivation of the pause mechanism 8, is moved up and down in conjunction with the main shaft and in synchronization with the other needle bar 6b, so that two consecutive stitches can be stitched again. Since the signal from the sensing switch LS becomes day, the terminal m of flip-flop FF2 becomes L, G5 becomes day, and the counter CT is cleared. Since the pedal is kept depressed during this time, the gate GI9 remains open until the end, and the sewing machine continues to drive at a low or high speed depending on the amount of forward depression of the pedal without stopping.

(V) From this state, move the pedal from the front pedal to the intermediate position and then operate the rear pedal, or immediately after the front pedal operation,
When the rear pedal is operated, W and TSW of the switch are closed, and at this time, the terminal n of flip-flop FF2 is set to day, the gate GI6 is set to L, and the state of flip-flop FF3 is set to ○, terminal p is set to L, and the detection is performed. switch P
When a layer signal higher than S is generated, gate GI7 becomes active, gate GI9 becomes L, gate G20 becomes active, deenergizes relay Ry, triggers mono-multi TI, and energizes magnet MB for △tl. and stop the sewing machine when the needle is high. At this time, one of the needle bars 6a or 6b that rotates the lever 10 is held at the rest position by the rest mechanism 8, but even if the signal from the sensing switch to the gate G4 is The gate G4 is kept blank due to L, and the output of the flip-flop FF2 does not change.
The sewing machine therefore remains stationary above the needle. (W)
When dial 24 is switched to manual, digital switch Z
The a, b, c, and d terminals of the flip-flop become day, day, day, day, and the exclusive nodes EI to E4 become day due to the LLLL of the ABCD terminal of the counter CT, and the gate GI3 is set to L, and the flip-flop day Q, Q The output is set to L and the gates G9 and G8 are set to day, but the gate G3 remains at L due to the day of gate G2.

When the lever 10 is rotated to one side or the other and the signal L is generated from the sensing switch, the relay R is activated as described above.
y is energized to drive the sewing machine, and the lower direct information signal is input to the counter CT and counted, but the exclusive Noah EI ~
E4 will never all be a day, so the output of the flip-flop day will not be inverted, so gates G9 and G8 will never go low. In addition, due to HHHH of the abd terminal of the digital switch Z, the gate G6 becomes L, and the gate GI becomes the day. When the operation switch 21 is pressed and the switch RSW is closed, the gate G2 becomes L, and the gate G3 becomes the day. Trigger the mono multi T3 and keep the Q output low for △t3
Then, when the magnet M.Re is energized and the lever 10 is returned to its original position, the signal from the sensing switch LS becomes positive, the m terminal of the flip-flop FF2 becomes L, and the gate G9 becomes positive.
When the lower layer is detected, gate GI9 is set to L, gate G20 is set to day, monomulti TI is triggered, and magnets M and B are set.
energizes relay Ry, de-energizes relay Ry, and stops the sewing machine.

Although not shown in the drawings, a presser foot device is provided with a presser foot which is always subjected to a downward force and is supported at the lower end and pressed against the upper surface of the needle slope. An electromagnet is provided to hold the lever 10 in the raised position, and an appropriate signal, e.g. a magnet MOS, is generated after the sewing machine is stopped after forming a predetermined outer stitch with one needle up to the outer corner in connection with the operation of the lever 10. When deenergizing, the electromagnet is energized for a predetermined period of time by a signal from gate G9 that changes from L to day, acts on the presser foot device to raise the presser bar and hold it in the raised position, and after a lapse of a predetermined period of time, the electromagnet is activated. It is also possible to deenergize the presser foot twill so as to lower it, and to form an outer corner stitch by turning the fabric by a predetermined angle while the presser foot is rising. Furthermore, in this embodiment, a sewing machine that forms a predetermined number of corner stitches from the outside thread of the counter has been described.
A timer circuit may be provided to drive the sewing machine for a predetermined period of time to form a predetermined corner stitch. In addition, although this embodiment has been explained using a sewing machine equipped with a high-speed motor and a low-speed motor, it is also possible to use a sewing machine equipped with a motor that electrically controls the sewing machine speed according to the amount of pedal depression, such as a magnetic fin clutch motor, or a high-speed motor. Alternatively, in a sewing machine equipped with a low-speed motor and a medium-speed motor, a predetermined corner stitch may be performed using a medium-to-long distance motor. As described above, according to the present invention, in order to automatically perform corner stitching using a single needle and returning to a double needle state upon completion of a predetermined corner stitch, the single needle operation by the operating device 10 is performed. In connection with this, the sewing machine is set to a single needle state, and the actuating device Ry is activated to start the sewing machine, and in connection with the completion of stitch formation of a predetermined length, the actuating device is deactivated, and the subsequent front pedal operation is performed. When forming a seam of a predetermined length, the first electromagnet MRe is activated to automatically return the operation diamond tatami mat, so that the operator can perform the operation at the start of corner stitching, the operation for turning the cloth at the outer corner, and the operation for turning the cloth at the outer corner. Since the specified corner stitch can be performed simply by pressing the front pedal after turning the fabric, the worker can perform the work without worrying about the amount of pedal depression, etc., and the work does not require a high degree of skill. It is easy, simple, and accurate, improving work efficiency, and since the sewing machine can be reliably stopped at a predetermined stitch position, stitches are rarely finished and the quality of sewn products is improved.

Brief explanation of the box Fig. 1 is a perspective view of the sewing machine body of this embodiment, Fig. 2 is a front view of the switch mechanism, Fig. 3 is a perspective view of the switch mechanism, Fig. 5 shows the electrical circuit, and Fig. 5 shows the electrical circuit. The figure is a time chart.

In the figure, 1 is a sewing machine, 10, LS is an operation bag counterfeit, M.
Re is the first crab magnet, Ry is the drive device, and M.S is the third crab magnet.

Figure 1 Figure 2 Figure 3 Figure 5 Figure 4

Claims (1)

[Claims] 1. It is possible to perform double-needle stitching, in which stitches are formed using two needles arranged crosswise in the fabric feeding direction while maintaining an interval, and single-needle stitching, in which stitches are formed with one of the needles inactive. A sewing machine having a needle bar mechanism, a driving device that drives the sewing machine, and a driving device that operates in conjunction with a front pedal operation, and a return operation that generates a start signal and returns the front pedal operation. A pedal that is movable so as to interrupt the interlocking, and a first position and a first position that are interlocked with the operation in one direction to cause the needle bar mechanism to sew a single needle and are locked and generate an operation signal. an operating device that can be restored to its original state by releasing the lock in the first position and can be moved to a second position where the needle bar mechanism performs double-needle stitching; an electromagnet, an actuating device that interlocks the sewing machine and the prime mover when the pedal is returned to its original position by electrical action, and interrupts the interlocking of both by electrical non-action; In connection with the generation of an operation signal by operation in one direction, the actuating device is activated while a seam line of a predetermined length is formed, and then it is inactive, and in connection with the generation of a start signal by the subsequent front depression of the pedal, the actuating device is activated for a predetermined length. and an electric circuit for forming a second seam line and for controlling a first electromagnet to operate in connection with the completion of forming the seam line.