JPS6016273B2 - Sewing machine control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is capable of locking movement between one side and a reverse azimuth as well as an intermediate position therebetween, and is subject to an elastic force such that it is always maintained in the direction of the intermediate position from one side and the opposite azimuth layer. The present invention relates to a control device for a sewing machine having an operating device.

Conventionally, two-needle stitches are used to form stitches using two needles placed at a predetermined distance on the left and right sides of the fabric feeding direction, and one is single-needle stitches in which one needle is paused and stitches are formed using only the other needle. In a twin-needle sewing machine that has a needle-tapping mechanism that enables needle stitching, when the operating lever is set to the intermediate position, the needle-tapping mechanism becomes double-needle sewing, and the needle mechanism is moved from the intermediate position to one or the other operating position. This allows switching to single-needle stitching using the left or right needle, but when corner stitching is performed using this sewing machine, the sewing machine is moved to the inside corner after forming parallel seam lines with the twin needles. The inner needle is brought to rest by operating the operating lever from the intermediate position to one or the other working position, and after forming the prescribed outer corner stitch with the outer needle, the needle is moved to the position corresponding to the inner corner. The sewing machine was stopped again, and then the locking means of the operation lever was manually released, and the elastic force returned to the intermediate position to perform double-needle stitching. However, it requires work such as releasing the lock of the operating lever, which has the disadvantage of making the work complicated and troublesome and reducing work efficiency. In addition, in connection with the movement of a control lever, etc. from an intermediate position to one or the other position, the movement is detected and a detection signal is generated, and the signal is used to prevent, for example, the front pedal operation when sewing corners. For twin-needle sewing machines equipped with a drive device that activates the device or starts the sewing machine by a signal from the device, two separate switches shall be provided for the drive device, one on one side of the operating lever and the other on the other side. First, the structure is complicated and the number of parts increases, making manufacturing complicated and increasing costs. Furthermore, as is well known, there are devices which are equipped with the above-mentioned switch and which define a movement range from the intermediate position of the operating lever to one or the other operating position according to the distance between the two needles. In a machine, if the needle spacing is set small, when the operating lever moves toward one or the other operating position, the switch cannot be closed even though the needle bar is in a single-needle state. The sewing machine is unable to generate the desired signal, and as a result, the sewing machine cannot be started and the specified corner stitching work cannot be performed, or the safety device cannot be activated and the user accidentally presses the pedal forward while sewing a corner, causing the sewing machine to fail. If the sewing machine is driven at high speed, making it impossible to stop the sewing machine at a predetermined position, and if the needle spacing is set to a large value, even though the operating lever has moved to the position where the switch is closed and a signal is generated, one needle threading mechanism cannot be stopped. The sewing machine is started before the needle can be switched to the full needle, resulting in undesirable double needle stitch lines, which deteriorates the quality of the product.

The present invention aims to eliminate these conventional drawbacks.

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 device 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 combs 6a and 6b with needles 5a and 5b fixed to the lower ends of each joint are arranged left and right orthogonal to the cloth feeding direction, and are supported on the jaw part 7 so as to be movable up and down in synchronization with the main axis. The known pause mechanism 8, which normally receives an acting force that maintains it in an inactive state, becomes active, so that one of the left and right needle bars 6a, 6b is appropriately disconnected from the main shaft, and the needle bars are moved just before the top dead center. It is possible to keep it in a dormant state. A stop mechanism 8 connects one end of the support shaft 9 rotatably supported to the machine frame 1 about a fixed straight line parallel to the cloth feeding direction.
A lever that connects to and places the tip at the end of the pond toward the front of the jaw part 7.
The base of the lever 10 is fixed, and the lever 10 is moved around the support shaft 9.
For example, when the needle bar 6a on the left side in Figure 1 is rotated clockwise in Figure 1, and when the needle bar 6a on the right side in Figure 1 is rotated counterclockwise, the needle bar 6b on the right side in Figure 1 is brought to rest. At the same time, when the needle is placed in an intermediate position between the clockwise direction and the counterclockwise direction, both the left and right needle bars 6a and 6b are activated, and the pause mechanism 8 is inactivated. . A cam plate 12 is fixed to the rear of the connection portion of the support shaft 9 with the stop mechanism 8, and is rotatable around a shaft 13 parallel to the support shaft 9. a coiled spring 2 supported by the sewing machine frame 1 and having one end fixed to the sewing machine frame 1;
6, the engaging body 14 is always subjected to an acting force to the left in FIG.
The end of the locking part 15 is formed into a forked shape, and one side of the locking part 15 is bent forward.The inner end face of the locking part 15 is arranged opposite to the front end face of the cam plate 12, and when the lever 10 is in the intermediate position, it is not engaged. The inner end surface of the joint portion 15 is engaged with the protrusion 11 of the cam plate 12 to maintain the engaging body 14 in the rotational position to the right in FIG. When the cam plate 12 is rotated to one or the other position, the notches 16a on both sides of the protrusion 11 of the cam plate 12
or 16b, the engaging body 14 is rotated to the left in FIG. A permanent magnet 18 is fixed to the upper part of the other side 17 of the forked part of the engaging body 14, and the engaging part 15 is engaged with the cutout part 16a or 16b of the cam plate 12 facing above the permanent magnet 18. The magnetic sensing body 19, which senses the magnetism of the permanent magnet 18 only when the engaging body 14 rotates to the left in FIG.
Fixed to. In addition, the support part 2 that protrudes to the side of the engaging body 14 fixes the tip of the plunger 23 of the electromagnet 22, which is activated by pressing the operating rod 21 placed in front of the machine frame 1, so that when the electromagnet 22 is activated, By suctioning the plunger, the engaging body 14 is wound around the engaging part 1 against the force of the spring 26.
5 engages with the protrusion 11 of the cam plate 12 so as to rotate to the right in FIG. 24 is a dial for selecting a predetermined number of stitches to be formed using only one of the needles 5a or 5b during corner stitching; one stitch, two stitches, You can select the number of stitches, 4 stitches or 8 stitches, and
Reference numeral 25a indicates the state of automatic corner stitching by a counter, and indicator light 25b indicates the state of manual corner stitching.

Next, to explain the electric circuit of this embodiment, the terminal V
c is a power supply terminal that is supplied with a logical H level (hereinafter abbreviated as "day") low current when the power is turned on, and terminal Va is supplied with a high current for magnetic drive. This is an operation switch that opens and closes in relation to the switch LSW, which is closed when the pedal is in the middle position and is open when the pedal is pressed forward.
The base input is applied to the transistor Trl to make it conductive, and the switch TSW is open at the middle position of the pedal and closed at the rear position of the pedal.

Further, RSW is a normally open switch that closes when the operating rod 21 is pressed. 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 in the needle position detection device 4 and closes the circuit to generate an H level signal;
The mountain is a sensing switch that generates a logical L level signal (hereinafter abbreviated as L) when the magnetic sensor 19 senses the magnetism of the permanent magnet 18, and the IR is an L level signal that instantaneously becomes L level when the power is turned on. This is an initial set circuit that generates a signal that later becomes H level. CT is a binary counter having output terminals A to D, ff is a known JK flip-flop, FFI to FF4 are known RS flip-flops, and TI to T3 have set times of Δtl to Δt3, respectively. GI~G21 are known IC NAND gates, BI~B1
4 is a known inverter that inverts the logic of the input signal;
I to E4 are also known exclusive lights, and DI and D2 are light emitting diodes that emit light when an H level signal is input, and when they emit light, they turn on the indicator lamps 25a and 25b, respectively. Y is an oscillation circuit that continues to oscillate switching pulses, and Z is an output terminal a, b, c corresponding to the selected position of the dial 24 of 1st hand, 2nd hand, 4th hand, and 8th hand in sequence.
, d, and a terminal e corresponding to the manually selected position, and among terminals a, b, c, and d, the output of only the terminal corresponding to the number of stitches selected by the dial 24 is at L level, and the other terminals are at L level. becomes H level, and when terminal e is selected with dial 24 in manual position, terminals a, b,
c and d are all at the daily level. Ry is a relay coil that has contacts that activate the low-speed motor that drives the sewing machine at low speed and switches it to the driving state, M●B is an electromagnet (coil) that acts on the brake device that stops the sewing machine when it is energized, and M S is an electromagnet (coil) that acts as a safety device to prevent the pedal from being pressed forward when energized, and M.Re is an electromagnet 22 (coil) that rotates the engaging body 14 to the right in FIG. 2 when energized. , when each of the transistors Tr2 to Tr5 connected to the collector of each coil becomes conductive, a terminal V is applied to each coil.
A high current flows through a to energize it. The number of stitches of the counter CT selected with the dial 24 is 5a, 5.
It is appropriately determined by the angles of the stitches in the needle and the corner seams in b.
This invention has the above-mentioned configuration, and the instantaneous L level of the initial reset IR due to the power supply being turned on causes the terminal 1 of the flip-flop FFI to become L, the terminal r of the flip-flop FF4 becomes low, the terminal g becomes low, and the terminals of the flip-flop FFI become low. 1, the terminal ○ of the flip-flop FF3 is set to 1, and the terminal p is set to L.

The needles 5a and 5b are stopped at the upper layer (that is, the upper layer detection position), and the H level upper direct signal detected from the detection switch PS is inverted by the inverter BII and sent to the gate G.
17 becomes day, and the L of terminal p of flip-flop FF3 makes gate GI8 day. At this time, the lever 10 is rotated clockwise or counterclockwise to rotate the cam plate 12, so that the engaging part 15 of the engaging body 14 engages with the notch 16a or 16b from the tip protrusion 11 of the cam plate 12. Engagement 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 n remains at day, and gates G3 and G9 are kept at day. Also, at this time, press the operator 21 to switch RSW.
When the circuit is closed and the input to gate G2 is day, terminal 1 of flip-flop FFI is L and gate GI is day, so gate G2 becomes L and gate G3 is day, triggering monomulti T3. During Δt3, the Q output is set to L, transistor Tr5 is turned on, and magnet M・Re is turned on.
energize. 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 instantaneously and flip-flop F
The terminal ○ of FF3 is set to L, the terminal p is set to 1, and the terminal 1 of flip-flop FFI is set to 1, which does not change until the pedal is pressed backward and the switch TSW is closed.
Even if you close switch RSW by operating 1, gate GI remains low.
Therefore, it is impossible to keep the gate G2 at daylight 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 from the front depressing position to the neutral 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 PS, the gate GI8 becomes "day" and the gate GI9 is turned to the low layer. , gate G20 is inverted by inverter B14 to turn off transistor Tr2, deenergize relay Ry to stop the low-speed motor, and mono-multi TI
is triggered to make the Q output L for a period of Δtl, and during this period, the transistor Tr3 is turned on to energize the magnets M and B, and the sewing machine is stopped at the needle lower layer. Monomulti T after △tl elapses
When the Q output of I returns to 1, the gate G21 becomes L, the terminal g of the flip-flop FF4 is set to 1, and after a predetermined time delay, the terminal r is set to L. Even if G20 changes, gate G20 does not change. (D) When dial 24 is set manually and then automatic four-hand mode is selected, the output of terminal abcd of digital switch Z changes from HHHH to HHLH, gate G6 becomes OFF, turns off light emitting diode DI, and turns off indicator lamp 5b. At the same time, the light emitting diode D2 is turned on to light up the indicator light 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 rotated clockwise in FIG. 1, the needle bar 6b is pulled up to just before the top dead center and is held in a resting state by the resting mechanism 8, and the cam plate 12 is also turned clockwise to remove the protrusion. The engaging part 15 of the engaging body 14 is disengaged from the cam plate 11, and the engaging body 14 is rotated to the left in FIG.
A signal L (level) is generated from S.

This L is inverted by the inverter B5 to set the gate G4 to L, and the terminal m of the flip-flop FF2 is set to 1, and the terminal n
becomes L, and the L of the terminal n is the terminal r of the flip-flop FF4, and as shown in FIG. On day 1, gate G9 is set to L, and is inverted by inverter B7 to trigger monomulti T2.
The Q output is set to L during △t2, and during that time the gate GII becomes low, turning on the transistor Tr4 and turning on the magnet M.S.
energizes and activates the safety device to prevent the pedal from being pressed forward and prevent the sewing machine from running at high speed. After the Q output of the monomulti T2 returns to the mark after Δt2 has elapsed, the gates GI0 and G are controlled by the switching pulse from the oscillation circuit Y.
Transistor Tr4 is intermittently turned on via II to energize 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. Counter CT that inputs lower layer signals from detection switch PS that occur intermittently as the spindle rotates.
Outputs A, B, C, and D are "HLLL" for the first stitch, "LHLL" for the second stitch, "HHLL" for the third stitch, and "" for the fourth stitch.
LLHL'' and output terminal a of digital switch Z
, b, c, and d are "HHLH", so when counting the fourth stitch, the exclusive noah E3 becomes the day, all of EI to E4 become the day, and the gate G13 is set to L. Gate G13
Q of flip-flop ff with L as clo cutting input,
The Q output is inverted and becomes L, and the gate G9 becomes low, and the gate GIO and GII are set to low and the transistor Tr4 is turned off via the inverter B7, and the magnet M.
Deenergize S to disable the safety device. Also, gate G
On the 9th day, the gate GI9 is input, and when the lower layer signal is input from the detection switch PS, the gate GI9 becomes L, and the gate G20 becomes the day, turning off Tr2 and relay Ry.
is deenergized, the monomulti TI is triggered, and the Q output is set to L during △tl. During this period, the transistor Tr3 is turned on and magnets M and B are energized to stop the sewing machine at the needle lower layer, and the monomulti TI When the Q output returns to day after △tl has elapsed, the gate G21 becomes L and the flip-flop 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
The river doesn't change. The Q output day of the flip-flop day and the day when L of gate GI3 is inverted by inverter B6 are the days when gate G7 is set to L, gate G5 is set to day, and counter CT is set.
clear terminal input, clears the counter CT, sets the outputs of terminals A, B, C, and D to L, L, L, L, and returns the gate GI3. The presser foot is raised, rotated around the needle 5b at a predetermined angle with the cloth, and then lowered again. At this time, the n-terminal L of the flip-flop FF2 is connected to the gate GI.
6 inputs, gate GI6 is kept at 1, and gate GI6 remains low even if the pedal is pressed backward and switch TSW is closed.
Therefore, the terminal 0 of the flip-flop FF3 does not become a day and the terminal p does not become an L, so the hands cannot stop directly at the upper position. (W) From this state, when the switch is opened by lightly pressing the pedal forward, the signal L (level) returns the terminal r of the flip-flop FF4 to 1, sets the gate GI9 to 1, and sets the gate G20 to L. , transistor Tr2 is turned on and relay Ry is energized to drive the sewing machine at low speed, but since the safety device is inactive, if the pedal is pressed further forward, the sewing machine will be driven at high speed by the high-speed motor.

The lower direct information signal from the detection switch PS becomes the input to the counter CT to start counting, and when counting the fourth stitch, the exclusive Noahs EI to E4 become "day, day, day, H" and the gate G
13 is set to L, and becomes the clock input of the flip-flop ff, and its Q and Q outputs are inverted and set to L and day. Gate G8 becomes L due to this Q output day and the day from gate GI3, and gate G3 becomes L. 2, trigger the monomulti T3, the Q output becomes L during △t3, and during this period, turn on the transistor Tr5, energize the magnet M.Re, and move the plunger 23 of the electromagnet 22 to the right in Fig. 2. The engaging body 14 is pulled and rotated to the right against the acting force of the coiled spring 21.
The magnetic sensor 19 no longer senses the magnetism of the permanent magnet 18, and the signal of the sensing switch LS becomes H', and the cam plate 12 is rotated counterclockwise in FIG. The engaging portion 15 is engaged with and maintained at the distal end surface of the portion 11. 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 unchanged, 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, the switches LSW and TSW are closed, and at this time, the terminal n of the flip-flop FF2 is set to day, the gate GI6 is set to L, the terminal ○ of flip-flop FF3 is set to day, the terminal p is set to L, and the detection switch When a direct signal higher than PS is generated, gate GI7 becomes active, gate GI9 becomes L, gate G20 becomes active, deenergizes relay Ry, triggers monomulti TI, and energizes magnet MB for △tl. and stop the sewing machine directly above the needle. At this time, one of the needle bars 6a or 6b, which rotates the lever 10, is held at the rest position by the rest mechanism 8, but even if the signal from the sensing switch LS to the gate G4 is no longer active, the signal from the sensing switch PS remains unchanged. Gate G4 by L
is held at 1, and the output of flip-flop FF2 does not change, so the sewing machine remains stopped at the needle level. M
) When the dial 24 is switched to manual, the a, b, c, d terminals of the digital switch Z will be set to day, day, day, day, and exclusive/a EI to E4 will be set to day by LLLL of the ABCD terminal of counter CT. The gate GI3 is set to L, the Q and Q outputs of the flip-flop day are 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 the gate G2. When the lever 10 is rotated to one side or the other and the signal L is generated from the sensing switch 10, the relay Ry is energized to drive the sewing machine as described above, and the lower calendar signal is input to the counter CT for counting. All of the exclusive gates EI to E4 are never set to day, so the output of the flip-flop day is not inverted, so gates G9 and G8 never become L. In addition, the gate G is set by HHHH of the abd terminal of the digital switch
6 becomes L, gate GI is set to day, and when the operating lever 21 is pressed to close switch RSW, gate G2 becomes L, gate G3 is set to day, and monomulti T3 is triggered, causing Q output to be △. During t3, the magnet M.Re is energized to L, and when the lever 10 is returned and the signal from the sensing switch LS is also received, the m terminal of flip-flop FF2 becomes L.
Therefore, gate G9 is set as day, and gate G is set when lower calendar is detected.
With I9 set to L and gate G20 set to day, monomulti TI
is triggered to energize magnets M and B, de-energize relay Ry, and stop the sewing machine.

Although not shown in the drawings, a presser foot is always applied to a presser foot that is supported at the lower end of the presser foot, and the presser foot is pressed against the upper surface of the throat plate. An electromagnet is provided to hold the lever 10 in the raised position, and an appropriate signal, such as magnet M. When S is de-energized, the electromagnet is energized for a predetermined time by a signal from gate G3 that changes from L to day, and acts on the presser foot device to raise the presser bar and hold it in the raised position, and after a predetermined time elapses. The electromagnet may be deenergized and associated with the lowering of the presser bar, and the fabric may be rotated through a predetermined angle while the presser bar is being raised to form the outer corner stitch. Furthermore, in this embodiment, a sewing machine that forms a predetermined number of corner stitches using a 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 an electromagnetic clutch motor, or a sewing machine equipped with a high-speed motor and a low-speed motor. In a sewing machine equipped with a low-speed motor and a mid-speed motor, a predetermined corner stitch may be performed using the medium-speed motor. Moreover, instead of the switch mechanism as shown in FIGS. 2 and 3, as a second embodiment, switch mechanisms 6 and 7
, 8 may be provided.

That is, a cam plate 52 having a pin 51 formed at its tip that extends parallel to the support shaft 9 toward the rear of the sewing machine is fixed to the rear of the connection part with the stop mechanism 8 at one end of the support shaft 9. 1 is fixed with a support plate 54 which is formed on an arc centered on the support shaft 9 and is provided with an elongated hole 53 through which a pin 51 of a cam plate 52 can slide. The movable plate 55, whose upper and lower middles are shorter than the longitudinal middle of the elongated holes 53 of the support plate 54, has a pin 51 that can be inserted into the movable plate 55 on an arc centered on the support shaft 9 in the vertical direction. In addition to forming a long groove 56 with a perforation, the outermost holes 57a and 57b whose longitudinal direction is in the left-right direction of the long groove 56 are respectively formed on the same straight line, and the outermost holes 57a and 57b are penetrated to form a supporting plate. 54 are provided with screws 58a and 58b at each location, and the movable plate 55 is always subjected to an acting force to the left in FIG. 6 by a coiled spring 59. When the electromagnet 6 and the plunger are connected to the movable plate 55 and removed, the movable plate 55 moves to the left in FIG.
Move until it engages with the right end in the longitudinal direction. As a result, the Saicho 56 of the movable plate 55 is separated to the left from the axis of the elongated hole 63 of the support plate 54, and the pin 51 engages with the upper end surface of the movable plate 55 to resist the restoring force of the pause mechanism 8. The cam plate 52 and the lever 10 are maintained in the rotating position, one of the two needles is maintained in a resting state, and the magnetic sensor senses the magnetism of the permanent magnet fixed to the moving plate, and the L signal is output from L and S. occurs. When corner stitching of a predetermined number of stitches is completed by operating the operating lever 21 or by using the counter, the electromagnet 60 acts to pull the movable plate 55 to the right in FIG. The moving plate 55 is moved until the long groove 56 moves on the axis of the hole 53, and the restoring force of the stop mechanism 8 causes the support shaft 9 to rotate counterclockwise in Figure 1 (clockwise in Figure 8), and the cam plate As the pin 52 rotates, the pin 51 enters the long groove 56 and is locked in the center of the long groove 56 in the longitudinal direction. In this embodiment and the second embodiment, when a current flows through M·Re shown in the magnetic circuit in FIG. Tow to the right.

When the lever 10 is in the intermediate position (FIG. 6), the pin 51 of the cam plate 52 is located at the longitudinal center of the elongated hole 53 of the support plate 54 and at the longitudinal center of the elongated groove 56 of the moving plate 55. Contains iron.

Although not shown, a permanent magnet is fixed to the movable plate 55, and a support plate 54 is attached opposite to the moving locus of the permanent magnet.
A magnetic sensing body is fixed to the magnetic sensing body, and the magnetic sensing body is fixed only when the movable plate 55 is in the state shown in FIG. The magnetism of the permanent magnet is sensed to generate an L signal from L and S. The second embodiment of the switch mechanism has the above configuration, and when the lever 10 is rotated clockwise in FIG. 1, the cam plate 52 is rotated counterclockwise in FIG. 6 about the support shaft 9. The pin 51 moves through the long hole 53 and the long groove 5.
6 is a switch device which opens and closes by sliding upward in FIG. 6 and detecting the separation from Saicho 56, but other switch methods such as a contact method may be used.

Although not shown, the protrusion 11 of the cam plate 12 of this embodiment
An auxiliary plate that can be moved and locked in the vertical direction is provided on the protrusion 1.
1, or by providing an auxiliary plate movable in the vertical direction around the long groove 56 of the movable plate 55 of the second embodiment, the movable plate 55 can be moved vertically. The timing at which the plate 12 or 52 is unlocked and rotated may be changed. As described above, according to the present invention, the moving means is movable in one direction and the moving means is movable so as to restore from the one direction position to the opposite direction position, and the moving means is moved in relation to the operation means being located at the intermediate position. Both means lock the operating means in one direction position and lock the operating means in those positions in relation to movement of the operating means to the one direction pupil or the opposite direction position and the moving means restored to the reverse direction position. By providing a connecting means related to the 3D and an actuating means for moving the moving means to a unidirectional position by acting on an electric signal, when the actuating means is actuated, the operating means such as the operating lever is automatically moved to the intermediate position. For example, after corner stitching is performed at the outer corner using the single needle hook mechanism of a two-needle sewing machine, an appropriate signal is generated by pressing a button switch, etc. at the position corresponding to the inner corner. By doing this, the operating lever can be automatically moved to the intermediate position and the needle mechanism can be returned to double needle sewing.
In addition to simplifying the return operation of the operating lever, if the sewing machine automatically generates an appropriate signal after forming a seam line of a predetermined length, it is possible to set the operating lever to an intermediate position without stopping the sewing machine and operate the needle comb mechanism. Since it is a two-needle sewing machine, regular stitching can be performed following corner stitching, which has the effect of significantly improving work efficiency.

In addition, by providing a detection means that detects movement of the moving means in one direction and generates a detection signal for starting the sewing machine or activating a safety device, a single switch can be used to control the operating means. Movement in one direction and the opposite direction can be detected, and the structure is simplified and the number of parts is reduced, making manufacturing easier and lowering costs.In addition, the needle spacing can be changed. However, by adjusting the locking and releasing timing of the moving means and the operating means, the timing at which the detection signal is generated by the detecting means can be stabilized. Since the timing of switching and the timing of generation of the detection signal can always match, corner stitches can be reliably obtained and the quality of the product can be improved.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the sewing machine of this embodiment, Figure 2 is a front view of the switch mechanism, Figure 3 is a perspective view of Figure 2, Figure 4 is the electric circuit, Figure 5 is the time chart, and Figure 6. 7 is a front view of the second embodiment of the switch mechanism, and FIG. 8 is a perspective view of FIGS. 6 and 7. In the figure, 12, 52 are operating means, 14, 55 are moving means, 11, 15, 51, 53, 56 are connecting means, 22
, 60, M.Re is an actuation means, 18, 19 is a detection means,
Ry, M.S are driving means. Figure 2 Galley Figure O Buddha Box Figure 5 Figure O Figure Na Figure 7 Figure O 8

Claims (1)

[Scope of Claims] 1. Double-needle stitching in which a stitch is formed by two needles arranged at a distance and intersecting in the cloth feeding direction, and the stitch is formed by disabling one of the needles. A needle bar mechanism that enables single-needle sewing, and a needle bar mechanism that is movable from one direction position and reverse direction position, and from both positions to an intermediate position between the two positions, as well as from one direction position and reverse direction position. an operating means associated with the needle bar mechanism such that the needle bar mechanism performs single-needle stitching in conjunction with the movement of the needle bar mechanism and double-needle stitching in conjunction with the return to the intermediate position; a moving means that is movable so as to be restored from a position and one direction position to a reverse direction position, and a moving means that locks the moving means in one direction position in relation to the operating means being located at an intermediate position and one of the operating means. coupling means associated with the operating means to lock the operating means in their positions upon movement to the directional position or the reverse position and the movement means restored to the reverse position, and interlocked with action by a signal; and actuating means for moving the moving means to a position in one direction. 2. Double-needle stitching, in which stitches are formed by two needles placed at a distance and intersecting in the fabric feeding direction, and single-needle stitching, in which stitches are formed with one of the needles inoperative. The needle bar mechanism is capable of moving in one direction and the opposite direction, as well as returning from both positions to an intermediate position between the two positions. An operating means associated with the needle bar mechanism so that the bar mechanism performs single-needle stitching and when the needle bar mechanism returns to the intermediate position, the needle bar mechanism performs double-needle stitching; The moving means is movable so as to be restored in the direction, and the moving means is locked in the one direction position in relation to the operating means being located at the intermediate position, and the operating means is moved to the one direction position or the reverse direction position. coupling means associated with the operating means for locking the operating means in those positions in relation to the movement and the moving means restored to the reverse position; an actuating means for towing the sewing machine; a detecting means disposed in association with the moving means to detect movement of the moving means and generate a signal; A control device for a sewing machine, comprising: a drive means associated with a sewing machine;