JPS6015358B2 - Sewing machine control device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a control device for a sewing machine that performs corner stitching using a sewing machine having two needles placed next to each other at a predetermined distance on the left and right sides, and particularly to a control device for performing corner stitching in a reliable manner. It relates to a device for.

When forming a corner seam using the following two-needle sewing machine,
A control circuit that operates by a signal generated by the front depression of the t-pedal or in connection with an instantaneous operation of the pedal after holding the inner Kakuto needle of the two hands in a rest state by operation of the operating lever etc. After the sewing machine is driven appropriately to form the outer corner, the sewing machine is stopped at the position corresponding to the inner corner, the operating lever is returned, and normal stitches are again formed using the twin needles. However, if you accidentally operate the control lever while sewing the outside corners and cancel the rest of the inside resting needle, the sewing machine will continue to operate and you will not be able to sew with the double needle. There were disadvantages such as the formation of two undesired seams at the corners, deteriorating the quality of the sewn product.

In addition, the control circuit is actuated by the signal generated when operating the control lever to stop the inner needle, and the sewing machine is driven, and after forming the outer corner stitches for a predetermined time or a predetermined number of stitches, the sewing machine starts sewing on the inner corner. In a sewing machine that automatically returns the operating lever to stop the sewing machine at the position where the outer corner stitch is formed, if the operating lever returns while forming the outer corner stitch, the sewing machine will stop while forming the corner stitch. In addition, the worker has to operate the operating lever again, making the work complicated and reducing work efficiency.In addition, the counter and timer circuits that operate the sewing machine for a predetermined number of stitches or for a predetermined time may malfunction. This resulted in drawbacks such as a predetermined number of stitches not being obtained and quality deteriorating.

The present invention aims to eliminate the above-mentioned 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/false detection device 4 is provided at the rear end of the main shaft to detect the rotation angle of the main shaft corresponding to the vertical position of the needle bar which moves up and down - times with respect to one 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 bar. Needle bars 6a and 6b with needles 5a and 5b fixed to the lower ends of each cylinder 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 conjunction with and in synchronization with the main shaft. The suspension mechanism 8 of the third clause, which normally receives an acting force that maintains it in an inactive state, becomes in an active state, so that one of the left and right needles 6a, 6b is appropriately interrupted from moving with the main shaft, and the upper end is stopped. It is possible to hold it in a resting state before turning on. One end of the support shaft 9 rotatably supported on the machine frame 1 with a fixed straight line parallel to the cloth feeding direction is connected to the stop mechanism 8, and the lever 10 whose tip is disposed forward of the jaw 7 is connected to the other end. Fix the base and move the lever 1 around the support shaft 9.
0 in one direction, for example clockwise in Figure 1, the needle bar 6a on the left side in Figure 1 is set to rest, and when the needle bar 6a is rotated in the direction of the rising indicator, the needle bar 6b on the right side in Figure 1 is set to rest. The pause mechanism 8 is operated as shown in FIG. There is. A cam plate 12 is fixed to the rear of the connection part of the support shaft 9 with the stop mechanism 8, and is rotatable around a shaft 13 parallel to the support shaft 9. The engaging body 1 is always subjected to an acting force to the left in FIG.
4 is formed into a forked shape, and one side thereof is bent forward so that the inner end surface of the end stop portion 15 faces the front end surface of the cam plate 12, and when the lever 10 is in the intermediate position, Engagement part 15
The inner end surface of the cam plate 12 is engaged with the projection 11 of the cam plate 12 to maintain the engaging body ld in the right rotation position in FIG. When the cam plate 12 is rotated to the other position, the protrusions 1 and 1 notches 1 on both sides of the cam plate 12
6a or 16b, the engaging body 14 is rotated to the left in FIG. .
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 senses the magnetism of the permanent magnet 16 only when the engaging body 14 is rotated to the left in FIG. Fix it to frame 1. In addition, the plunger 23 of the electromagnet 22 is activated by pressing the operating rod 21 arranged in front of the machine frame 1 from the supporting portion 20' that protrudes to the side of the engaging body 14.
When the electromagnet 22 is activated, the plunger is attracted and the engaging body 14 is wound until the engaging part 15 engages with the protrusion 11 of the cam plate 12 against the action force of the spring 26. They are connected so that they can rotate to the right in the figure. 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 choose the number of stitches: four stitches or eight stitches.
In addition, 25a indicates the state of automatic corner stitching by the counter.
Further, 25b is an indicator light for displaying the state of manual corner stitching.

Next, to explain the fin air circuit of this embodiment, the terminal V
c is the power supply terminal that is supplied with a logical H level (hereinafter abbreviated as "day") low current when the power is turned on, and Satoko Va is supplied with a high current for the magnetic drive, and false W and TSW are supplied with pedal operation. It is an operation switch that opens and closes in relation to the switch W, which is closed when the pedal is in the middle position and is opened when the pedal is in the front position, thereby inputting the base input to the transistor Trl and making the switch TSW conductive. is open when the pedal is in the middle position, and becomes open when the pedal is depressed at the rear.

Further, RSW is a normally open switch that becomes a disconnection when the operation member 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 generates an H level signal as a branch;
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 reset circuit that generates a signal that later becomes H level. CT is a binary IC counter with output terminals A to ○, the well-known JK flip-flops, FFI to FF turtles are the well-known RS flip-flops, and TY to T3 are the set times of △tl to △t3, respectively. GI to G21 are known IC NAND gates, B1 to B
14 is a known inverter that inverts the logic of the input signal;
81 to E4 are also known exclusive Noah, DI
and D2 are light emitting diodes that emit light when an H level signal is input, and when emitting light, the indicator lights 25a. 2.5b is turned on. Y is an oscillation circuit that continues to oscillate switching pulses ~ Z is the first and second hands of dial 24,
Output terminals a and b corresponding to the selection position of four stitches and eight stitches
, c, d and a switch e corresponding to the manual selection position, and the output of only the terminal corresponding to the number of stitches selected by the dial 24 among terminals a, b, c, and d is at L level. The others are at H level, dial 2
When terminal e is selected with 4 in hand position position, terminal a,
b, c, and d are all at the daily level. Ry is a relay coil that has a contact point that activates the low-speed motor that drives the sewing machine at low speed and switches it to the driving state, and M●B is an electromagnet (with coil included) that acts as a brake to stop the sewing machine when it is energized. S is a fin magnet (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 outside of each coil is conductive, a Korai current flows through the terminal Va to energize each coil. The number of stitches on the counter CT selected with the dial 24 is needle 5a.
, 5b and the angles of the corner stitches. This invention has a configuration as shown in C. When the power is turned on, the instantaneous L of the initial reset IR causes the terminal 1 of the flip-flop FF to become L, the terminal r of the flip-flop FF4 becomes low, and the terminal g of the flip-flop FF4 becomes low. The terminal ◯ of the flip-flop FF3 is made low by the L of the terminal 1 of the flip-flop FFI, and the terminal p of the flip-flop FF3 is made low.

The hands 5a and 6b are stopped at the upper level falsehood (that is, the upper layer detected level falsehood), and the H level upper level demon signal detected from the detection switch PS is inverted by the inverter B1 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 portion 15 of the submerged assembly 14 engages from the tip protrusion 11 of the cam plate 12 to the notch 16a or 16b. By rotating the engaging body 4 to the left in FIG. 2, the magnetic sensing body 19
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. 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 G8 and G9 are kept at day. Also, at this time, press the operating device 21 to switch RSW.
When the input to the gate G2 is set to 1, the terminal 1 of the flip-flop FFI is L and the gate GI is set to 1, so the gate G2 becomes L and the gate G3 is set to 1, which triggers the 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 is operated to the rotating position before the crab source is introduced, 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
Terminal ○ of F3 is set to L, terminal p is set to day, and terminal 1 of flip-flop FF is set to day.
Even if the switch RSW is closed by operating the gate GI, the gate GI becomes L, the gate G2 remains open, and the magnet M/Re cannot be energized. 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 forward operating position to the neutral position, when the hands 5a and 5b are in the lower position,
That is, when a lower layer signal of H level is generated from the detection switch, the gate GI8 becomes low and the gate GI9 becomes low.
The gate G20 is set to 1, the inverter 8141 inverts the transistor Tr2, turns off the transistor Tr2, activates the relay Ry to stop the low-speed motor, and triggers the monomulti TI to set the Q output to L during △tl. The transistor Tr3 is turned on to energize the magnets M and B to stop the sewing machine in the lower needle position. △Mono multi TI after tl has passed
When the Q output returns to H', the gate G21' becomes L, causing a flip. The terminal g of the knob FF4 is set to L after a predetermined time delay, and the L of this terminal r sets the gate G20 to H'.
Even if gate GI9 changes while this is maintained, gate G20 does not change. (0) When the dial 24 is selected from manual to four-handed, terminals a, b, c. The output of d changes from HHHH to HHLH, and the gate G6 turns off, turning off the light emitting diode 01 and extinguishing the indicator light 25b, while also turning on the light emitting diode D2 and turning off the indicator light 25.
Turn on 8.

Also, on the day of gate G6, gate GI is set to L and gate G2 is
Since this is the day, press the 2nd control panel and press the switch R.
Even if the SW is closed, the gate G2 remains unchanged. (m
) When the lever 10 is rotated clockwise in the figure, the needle bar 6b is pulled up to just before the top dead center and is held in a resting state by the pause mechanism 8, and the cam plate 12 is also rotated clockwise so that the protrusion ] The engaging part 15 of the engaging body 14 is disengaged from the turtle, and the engaging body 14 is moved to the left in FIG. L
A signal L (level) is generated from S.

This L is inverted by the inverter B5 so that the gate G becomes L, and the terminal m of the flip-flop FF2 changes from H to the terminal n.
becomes L, and the L of the terminal n is the terminal r of the flip-flop FF turtle, and as shown in FIG. , with the regular gate GS of the terminal m as Z, it is inverted by the inverter 87 and triggers the monomulti T2,
The Q output is set to 'L' during △t2, and during that time the gate G is turned on, turning on the transistor Tr and magnet M.
S is energized and the safety function is activated to prevent the front pedal operation and prevent the sewing machine from running at high speed.After the Q output of the monomulti T2 returns to 1 after △t2 elapses, the oscillation circuit The switching pulse from Y causes the transistor Tr4 to be intermittently turned on via the gates GIQ and GI to energize the magnets M and S, thereby maintaining the safety device in its operating state. Gate G2Q becomes L, attaches relay Ry, and drives the sewing machine at low speed.Output A, 8 of counter CT that inputs the lower pupil signal from the detection switch whistle that occurs intermittently as the main ball rotates. , C, 0 is rHLLL'' at the first stitch, “LHLL” at the second stitch, “HHLL” at the third stitch, and “L” at the fourth stitch.
LHL'' and output terminals a and b of digital switch Z
, c, d are ^HHLH'', so when counting the fourth stitch, the exclusive Noah E3 becomes the day, and all of EI to E4 become the day, making the gate GI3 L.L of the gate GI3.
The Q and Q outputs of the flip-flop with CL input as K input are inverted and become L, and the gate G9 becomes L, and the gate GIO and GII are set to L and the transistor Tr4 is turned off to turn off the magnet. De-energize the M/S and make the safety armor ineffective. Also, H of gate G9
When the lower layer signal is input from the false detection switch, the gate GI9 becomes L, turns the gate G20 on, turns off Tr2, deenergizes the relay Ry, and triggers the monomulti TI. and Q output △tl
When the Q output of the monomulti T turtle returns to H' after △tl has elapsed, the gate G2 is turned on. As a result, the output from terminal 1 of the flip-flop FF turtle is slightly delayed and becomes L', and the output from gate G2
Even if gate GI9 changes while keeping 0 at day, gate G20
does not change. The Q output day of the flip-flop ff and the day when the L of the gate GI3 is inverted by the inverter B6 are the days when the gate G7 is set to L, the gate G5 is set to the day, and the counter CT is calculated.
The clear terminal is input, the counter CT is cleared, the outputs of terminals A, B, C, and D are set to L, L, Z and L, and the gate GI3 is returned to 1. Turn the cloth by a predetermined angle and lower the presser foot again.
At this time, the n terminal of flip-flop FF2 is now the gate G.
Even if the gate GI6 is kept as input to I6 and the switch TSW is closed by depressing the back pedal, the gate gate 6 will not go to L, so the terminal ○ of the flip-flop FF3
, the terminal p does not become L, so the needle cannot stop at the upper layer. (N) From this state, when the switch LSW is opened by lightly pressing the pedal forward, the signal L (level) returns the terminal r of the flip-flop FF turtle to 1, sets the gate GI9 to 1, and sets the gate G20 to L. ~Transistor Tr2 is turned on to energize relay Ry 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 signal from the lower layer from the detection switch tower becomes input to the counter CT and starts counting, and when counting the fourth stitch, the exclusive Noahs EI to E4 become "day, day, day, H" and go to gate G1.
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 △t3, during which time transistor T
Turn on r5 to energize magnet MORe, and electromagnet 2
Pull the plunger 23 of No. 2 to the right in Figure 2 to remove the engaging body 1.
4 rotates to the right against the acting force of the coiled spring 21, the magnetic sensing body turtle 9 no longer senses the magnetism of the permanent magnet 18, and the signal from the sensing switch LS disappears, and the cam plate 12 rotates. Rotates counterclockwise in FIG. 1 due to the action of the stop mechanism 8,
The engaging portion 15 is engaged with and maintained at the tip end surface of the protrusion 11. Therefore, the lever 10 also returns to the intermediate position, and the stop mechanism 8
The needle twill 6a, which had been at rest due to inactivity, moves up and down in conjunction with the main shaft and in synchronization with the other 6b, forming two consecutive stitches again, and the signal from the sensing switch LS is As a result, the terminal m of flip-flop FF2 becomes L.
Therefore, G5 is set as the day and the counter CT is cleared. Since the pedal is kept depressed during this time, the gate GIS remains unchanged, and the sewing machine continues to run at low or high speeds 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 false W and TSW are closed, and at this time, the terminal n of the flip-flop FF2 is set to 1, the gate GI6 is set to L, and the terminal ○ of the flip-flop FF3 is set to 1, and the terminal p is set to L. When an upper layer signal is generated from the detection switch gate, gate GI7 becomes active, gate GI9 becomes L, gate G20 becomes active, and relay R is activated.
y is deenergized, the monomulti TI is triggered, the magnet MB is energized for Δtl, and the sewing machine is stopped directly above the needle.

At this time, one of the needles 6a or 6b that rotates the lever 10 is held at the rest position by the resting mechanism 8, but even if the signal from the sensing switch LS to the gate G4 is turned on, the signal from the sensing switch M Since the LI gate G4' and H' are held, the output of the flip-flop FF2 does not change, and therefore the sewing machine remains stopped at the upper layer of the needle. (W) When the dial 24 is switched to manual mode, the a, b, c, d terminals of the digital switch Z become H day, day, day, and the exclusive Noah Ei to E4 become the day due to the LLLL of the ABCD terminal of the counter CT. and set gate GI3 to L,
The Q and Q outputs of flip-flop 8 are set to L (day), and gates G9 and G8 are set to day, but gate G3 remains at L due to the day of gate G2.Turn lever 10 to one side or the other to open the sensing switch. When the signal L is generated,
As mentioned above, the relay Ry is energized to drive the sewing machine, and the lower history signal is input to the counter CT and counted, but all of the exclusive nodes EI to E4 do not become days. Therefore, the flip-flop days are Since the output is not inverted, gates G9 and G8 will never become L. In addition, gate G6 is activated by HHHH of the abd terminal of digital switch Z.
becomes L and the gate GI is set to 1. When the operating lever 21 is pressed and the switch RSW is closed, the gate G2 becomes L.
Then, when the gate G3 is turned on and the monomulti T3 is triggered, the Q output is set to L during △t3 and the magnet M'Re is energized, and the lever 10 is reset and the signal from the sensing switch LS is turned on, the flip-flop is activated. The m terminal of FF2 becomes L, gate G9 is set to day, and gate GI is set when a lower counterfeit is detected.
9 is set to L, gate G20 is set to day, the monomulti TI is triggered to energize the magnet MOB, and the relay Ry is deenergized to stop the sewing machine.

Although not shown in the drawings, the presser foot is supported at the lower end and always receives a downward force, and the presser foot is in contact with the upper surface of the throat plate. An electromagnet is provided to hold the sewing machine in the raised position, and an appropriate signal, e.g. When deenergizing M/S, the electromagnet is energized for a predetermined period of time by a signal from gate G9 that changes from L to H', and acts on the presser foot to raise the presser bar and hold it in the raised position. "After a predetermined time has elapsed, the fin magnet may be deenergized to lower the presser foot, and while the presser foot is rising, the fabric may be turned at a predetermined angle to form an outer corner stitch. In this embodiment, a sewing machine that uses a counter to form a predetermined number of corner stitches has been described, but a timer circuit is provided to drive the sewing machine for a predetermined time to form a predetermined corner stitch. Also, ``In this embodiment, the sewing machine is equipped with a high-speed motor and a low-speed motor. In a sewing machine equipped with a high-speed motor, a low-speed motor W, and a mid-range motor, a predetermined corner stitch may be performed using the mid-range motor. In order to prevent the lever from inadvertently returning to the intermediate position, the circuit is used to prevent the lever from returning to the intermediate position. It is also possible to provide a mechanical means that operates to cut off the action and energize this electromagnet from the time the lever is operated until the end of a predetermined corner stitch. Instead of the system in which the sewing machine is driven by the signal generated by the sewing machine, and the lever Kazuki-unagi is reset automatically or by operating the operating rod 21 when a predetermined corner stitch is completed, the lever is activated by operating the lever, and then when the sewing machine is in the manual position. The sewing machine is driven by the signal generated by the pedal sewing, or by the instantaneous harvesting of the pedal etc. when automatic, and when the specified corner sewing is completed, by the release of the pedal when manual sewing, and after automatically stopping the sewing machine when automatic. In a sewing machine in which the lever is operated to return, the above-mentioned blocking means may be arranged in relation to the lever.

As described above, according to this expression, the movement of the operating means to the first position is blocked in relation to the movement of the operating means to the second position, and the blocking is released when the action signal is generated. By having a blocking means, even when forming a predetermined corner stitch at a corner of cloth using a main needle key, the operating device will not return even if you accidentally touch the Hinasakuso Koji while forming a false stitch. Because the sewing machine does not go into double-needle sewing mode, there is no need for two unwanted stitches to form at the corners, and the sewing machine automatically sets the predetermined stitch length like a counter or timer circuit. It is possible to always form stable and reliable corner seams without causing any malfunction to the one-needle lantern used to form the stitches, which has the effect of improving the quality of sewn products. In addition, ``the operator does not have to pay attention to the operating device while corner stitching, which has the effect of significantly improving work efficiency.

At the bottom of the drawings, the simple explanatory blinds are a perspective view of the main body of the sewing machine of this embodiment, Figure 2 is a front view of the switch mechanism, Figure 3 is a perspective view of the switch machine, and Sagi-Kame is an electric circuit. The figure is a time chart.

In the diagram ~ Military 0, LS are the operating devices "GI, G29
It is a means of preventing until G.

Figure by plan 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. the needle bar mechanism, an operating means capable of moving and locking the needle bar mechanism in a first position for double-needle stitching and a second position for single-needle stitching, and an appropriate electric signal. setting means actuated to generate an actuation signal in connection with completion of the formation of a single needle stitch of a predetermined length; and a setting means actuated to generate an actuation signal in connection with the completion of forming a single needle stitch of a predetermined length; a control device for a sewing machine, comprising blocking means for blocking the movement of and releasing the blocking in conjunction with the generation of an activation signal.