JPS6075084A - Driving controller of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive control device for a sewing machine that stops the sewing operation of the sewing machine when the needle thread breaks during sewing or when the needle thread wound around the bobbin is completely consumed. .

Conventionally, the above-mentioned sewing machine was Q-1, Kaimei 53-5.
The one described in Publication No. 3461 is known. However, in this case, in order to drive the sewing machine once, a sub-system must be set, and noise during the manufacturing stage, durability tests, lubrication on the user side, and various adjustments and checks, etc. However, this method has the disadvantage of interfering with the operation of sewing machines that do not require sewing thread.

The object of the present invention is to solve the above-mentioned drawbacks of the prior art without impairing the original function.

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

Regarding the configuration of the mechanical part, the sewing machine has a main shaft 2 that rotates in conjunction with a drive source, a needle bar 4 that has a needle 3 with needle thread T fixed to its lower end and moves up and down in conjunction with the main shaft 2, and a needle thread supply source. A thread take-up 6 that supports the needle thread F between the spool 5 and the needle 3 and reciprocates between three positions in conjunction with the main shaft 2 to tension and relax the thread F, and a thread that is generated as appropriate. It is equipped with a thread cutting device (not shown) that operates in response to a cutting signal and cuts the needle thread T connected to the fabric below the bed, a thread winding device 93 for the bobbin thread bobbin, etc. This is a known type in which the width, the amount of feed of the feed dog, and the direction thereof are controlled based on information stored in a storage device in advance. Further, the needle thread T is connected to the thread tension device 7 from the bobbin winder 5 as shown in FIG. First holding means8. Feeding detection device 9. The thread take-up lever 6. The hook has been passed.

The feeding device 10 has a feeding arm 12, and controls the length of the needle thread path between the first and second holding means 8 and 11 so that the needle 3 is located below the bed surface as shown in FIG. This is to minimize the time required for tensioning the needle thread by the thread take-up 6. The feeding arm 12 has a vertically inclined transmission surface 12a and a U-shaped thread holding groove 1i located below the transmission surface 12a, and is fixedly arranged vertically as shown in FIGS. Hole 13 formed in two guide plates 13 and 14
a.

14a, and its base includes a link 16 supported on a fixed shaft 15 and a lick 19 supported on a fixed shaft 17.
and a pivot at each free end. The link 19 follows the cam surface of the cam body 18 via a spring 20 that is hooked between the link 19 and the machine frame.

The feed-out detection device 9 detects when the needle thread T is fed out from the bobbin 5 by the arm]2
The needle thread T is used to detect the length of movement toward
It consists of a booley 21 having a VflJ 21a around which it is wound, and an encoder 22 that generates one pulse every time the boolean 9-21 rotates by a certain angle.

The thread tension device 7 has a thread tensioner 23, which is used to constantly apply a constant weak passing resistance to the needle thread T so that the needle thread T is tightly wound around the pulley 21. As shown in FIG.
It is slidably supported on support shafts 26 and 27 that project horizontally from 5. The sliding movement of the thread removal prevention plate 24 is restricted by a ring 28 attached to the spindle 26, and its free end 24a is inserted into the hole 23a formed in the thread picket 23 and the base plate 25.
, 25a from above obliquely downward. In addition, the coil spring 29 is used to suppress the thread puller 23 toward the base plate 25, and the coil spring 30 is used mainly to cause the free end 24a of the thread removal prevention plate 24 to apply a rotational moment toward the hole 25a. It is something.

The first holding means 8 attracts and releases the holding plate 32 as an armature by energizing and de-energizing the electromagnet 31.
2 and the opposing yoke 33 to hold the needle thread r so that it cannot pass therethrough or to release it so that it can pass therethrough. The holding plate 32 is supported so as to be able to move up and down by shafts 34 and 35 provided upright on the yoke 33, and is always subjected to a weak elastic force of a coil spring 36 downward, which speeds up the rise of the attraction force by the electromagnet 31. .

The upper surface of the yoke 33 of the above-mentioned holding means is located at the intersection point P (
(Fig. 7) and the groove 96a of the roller 96 pivotally supported on the machine frame.
The tension of the needle thread 'r causes the tip 32 to act as a coil spring;
36, so that the front catch 32 is always pressed against the upper surface of the yoke 33 by the weak elastic force of the spring 36.

The second holding means Jl has basically the same structure as the first holding means 8, and attracts and releases the holding plate 38 as a mature by the excitation and non-movement 6& of the electromagnet 37, and the yoke 39
This is for pinching and releasing the needle thread 'Y so that it cannot pass therethrough or can be made possible. As shown in FIGS. 2 and 6, the holding plate 38 is supported so as to be able to swing around the bifurcated protrusion 40a of the support frame 40 of the electromagnet 37 as a fulcrum, and always receives the elastic force of the coil spring 41 in the direction away from the yoke 39. ing. Also, a regulating body 42 that regulates the swinging position of the holding plate 38 due to this elastic force.
is integrally formed with the yoke 39 from synthetic resin, and is designed to keep the distance S1 between the opposing surfaces of the holder 38 and the iron core 43 constant at all times. In addition, a certain gap S2 is provided between the opposing surfaces of the iron core 43 and the retaining plate 38 when attracted to the yoke 39, so that when the electromagnet 37 is demagnetized, the separation of the retaining plate 38 from the iron core 43 is delayed due to residual magnetism. It prevents

The operating lever 44 is supported so as to be rotatable in three positions, i. This operation lever 44 has a presser foot (
The presser foot lifting force l·47 for lifting the presser bar 45 having a presser bar (not shown) against the pressing spring 46 and the clamping force of the needle thread P in the thread tension device 7 and the first holding means 8 are applied. A thread loosening cam 48 for release is integrally supported. The lower surface of a presser bar holder 49, which is integral with the presser bar 45, is disposed opposite to the presser foot lifting cam 47 so as to raise the presser bar 45 when the operating lever 44 is rotated to the "A" position.

In addition, the thread loosening cam 48 is designed to move the thread gauge 23 against the spring 9 to the position indicated by the two-dot chain line in FIG. It is disposed opposite to a follower 50 connected to a link mechanism that acts to push the holding plate 32 upward against the spring 36. The follower 50 is swingable about a shaft 51, and this swinging motion is transmitted to the thread measurer 23 through shafts 52, 53 and/or 54, 55. ing. Further, the forked portion 54a of the link 54 has a locking portion 32a of a holding plate 32 loosely fitted at one end thereof, and is loosely fitted vertically to the lower portion of the connecting rod 56. A coil spring 58 having a larger spring constant than the spring 36 is arranged between the connecting rod 56 and the horizontal protrusion 57.

As shown in FIG. 1, the holding plate 32 of the first holding means 8 and the pulley 21 of the feeding detection device 9 are tilted toward the inner side of the surface machine frame 59 itself, and the needle thread T is held by force of -60. Side 6
Just wrap it around 0a, 60b, 60c and pull it.
The needle thread T naturally slides down and is set against the first holding means 8 and the feeding detection device 9.

Regarding the electric circuit, the position detection device 61 consists of a rotary plate 61a fixed to the main shaft 2 and a detector 611 for detecting it as shown in FIG. It detects the 20 rotation angles of the main shaft up to just after it rises from the plane and generates a low level (hereinafter referred to as ``lower'') position signal, and from then on, a high level (hereinafter referred to as ``1-1'') position signal is generated. ) generates a position signal.

As shown in FIGS. 3 and 4, the Ichihara detection device 62 includes a movable part 62a that rotates forward and backward in conjunction with the vertical movement of the presser bar 45, and a volume 621 that generates a voltage (Ichihara signal) corresponding to the rotational position of the movable part 62a. It has become.

The presser foot lift switch 63 is disposed within the swinging path of the link 54 as shown in FIG. Occurs.

The speed detection device 64 detects the rotational speed of the main shaft 20 and generates a corresponding number of pulses (speed signal). The error calculating device 65 is for correcting the error in the amount of yarn to be paid out due to the slow response operation of each holding plate 32, 38 in the first and second holding means 8°11, and the output pulse of the speed detecting device 64 is The number B obtained by multiplying the number N by the constant 1 (found experimentally)
A pulse (correction signal) is generated.

The memory circuit 66 stores information (
It stores information (feed amount signal The information corresponding to the stitches is read out via the pattern control circuit 67, and these pieces of information are sent to the stitch width signal Y and the feed amount signal X.
At the same time, the amplitude signal Y is sent to the launch circuit 69 and the feed amount signal X is sent to the latch circuit 70 as well. Note that the launch circuit 69 is connected to the position detection device 61.
The latch circuits 68 and 70 operate in conjunction with the fall of the position signal, and the latch circuits 68 and 70 operate in connection with the fall of the position signal, and A circuit outputs its input as it is depending on its operation.

A needle swing stepping motor (ST, M) 71 is used to operate the needle bar swing mechanism, and is driven by receiving the output of the launch circuit 69 via a drive circuit 72. A feed stepping motor (ST, M) 73 is used to operate the feed mechanism, and receives the output of the launch circuit 70 and is driven via a drive circuit 74.

The setting device 75 inputs each signal X, Y,
This is to set the needle thread feed amount required for each stitch formation based on D, and as shown in FIG. 9, the square value of the feed amount signal Added value P2
By adding the value k IF5 which is the constant multiplied by + and 2P to the value which is the square root of P2 multiplied by the constant 2, we get "k+P2-1".
- to 2 wells 1, add the constant multiplied by 3 to the Ichihara signal to make [k+P2+kzP+kzDj, and then add 4 to the constant to output the resulting value (setting signal) A. Even if it becomes.

The subtraction device 77 outputs a value C obtained by subtracting the output value B of the error calculation device 65 from the output value A of the setting device 75 (theoretical value in FIG. 11) as a feed signal to the comparison circuit 78. When the output values of the subtraction device 77 and the counter 79 match, a signal I-1 is generated. The counter 79 outputs a value obtained by counting the output pulses of the feeding detection device 9, and is reset by the fall of the position signal.

The Norinob flop FF+ receives the 1 signal from the comparator circuit 78 and enters the operating state, and is reset to the non-operating state in relation to the fall of the position signal. Ant games via
) sent to G2. The electromagnets 31, 37 are connected to the AND gates Gl, G2 through corresponding actuation circuits 80, 81, respectively.
It is excited by the H output and demagnetized by the L output.

The Furi7 Pfronop FF2 holds both the holding means 8 during the first few stitches after the power is turned on, and during the formation of the next stitch and the first few stitches after the finished sewing material is removed from the sewing machine sewing section.
, 11, and receives a signal from the feed-out detection device 9 or a signal instantaneously generated from the initial setting circuit 82 in connection with turning on the power, and upon the rise of the signal. It is set to the operating state and is reset to the non-operating state by the rising edge of the output of the one-shot machine I-M S2, which operates in response to the sewing machine stop signal generated in connection with the sewing machine stop operation, and the Q terminal output is set to the OR gate q3. It is manually powered through AND gates Gl and G2. Further, the counter 83 counts the falling edge of the output of the position detecting device 6, and the value is set to a preset value ("5" in the embodiment).
The one-shot M S operates in response to the sewing machine start signal generated in connection with the sewing machine start operation, and the output is reversed from L to ■1 in connection with reaching the sewing machine starting operation.
It is reset in relation to the rising edge of the output of G3, and its output is input to G1 and G2 via an OR gate G3.

In conjunction with raising the presser foot, the presser foot lift switch 63 releases the needle thread T from both holding means 8 and 11 if the needle 3 is in the upper stop zone when it is out of the bevel surface. The output is for anime games) G4
．． This is the input to the ant gates G+ and G2 via the inverter 3.

The Norinob flop F ly" 3 is used to judge that the needle thread is consumed or cut when the output of the feed-out detection device 9 is 1 from the beginning of sewing. 10, the output pulse of the feed-out detection device 9 and is reset to a non-operating state in relation to the rise of the output of the W/WAN MS3 which operates upon receiving a start signal.
At the same time, the Q terminal output is
The Q terminal output is the input of the ant gate G6.

The flip-flop I24 is used to determine that the needle thread li+ has been consumed or cut when the output from the feed-out detection device 9 is no longer generated during sewing.
It enters an operating state upon receiving an output pulse from the position detection device 61, and is reset in relation to the fall of the output of the position detection device 61, and the Q terminal output is input to the gate G5 via the inverter 14.

The counters 84 and 85 count the rise of the signal from the position detection device 61, and are related to when the value reaches a preset value (in the embodiment, the former is the "7" hand and the latter is the "3" hand). The output of the counter 8/I is reset from L to 1-1, and the counter 8/I is reset by the rising edge of MS3, and the counter 85 is reset by the rising edge of the output of flip-flop FF4. .

The counters 86 and 87 both count the output pulses of the feed-out detection device 9 and output their values, and the counter 86 also controls the winding mode which is generated in connection with setting the known bobbin winding device 93 into operation.・The counter 87 is reset by the rising edge of the output of the one 7 yonoto IS4 that operates in response to the ON signal, and the counter 87 is set to the bobbin winding mode that occurs in connection with releasing the bobbin winding device 93 to the inactive state.
It is reset by the rising edge of the output of the one-shot MS5 which operates in response to the off signal.

The comparison circuit 88 is connected to the lower thread bobbin 9 by the bobbin winding device 93.
4 is for automatically winding a desired yarn amount, and the output is reversed when the output value of the yarn winding amount setting device 89 and the output value of the counter 86, which are set appropriately, match. However, the output at this time is used to stop the sewing machine motor via the morph stop circuit 95, or alternatively, the lenoit is excited and the electromagnetic force is used to stop the sewing machine motor 93.
may be moved to a non-active position.

The memory circuit 90 is connected to the lower thread bobbin 94 by the bobbin winding device 9;3.
It stores the amount of yarn wound on the counter 86, and always outputs the stored value, and the stored contents are cleared by the rising edge of the output from the counter 86. It is now possible to do so.

The comparison circuit 91 is for detecting when an amount of needle thread equivalent to the amount of thread wound on the bobbin thread bobbin 94 is consumed, and compares the output of the memory circuit 90 with the output of the counter 87 to determine whether both of them are equal to each other. A signal of 1-1 is output for a certain period of time in relation to a match. In addition, alarm devices such as buzzers and lamps 9
2 operates for a certain period of time when the output of NOR gate G7 becomes L.

It should be noted that the amount of thread necessary to form a seam can be obtained by controlling the feeding movement of the feeding arm 12 and the actuation timing of both holding means 8°Jl, as will be described later.
In particular, a delay in the operation of the holding plate 32 of the holding means 8 causes a feeding error. Therefore, as shown in FIG. 11, in order to prevent the actual amount of feeding out from exceeding the allowable upper limit, as shown in FIG. The cam surface of the cam body 18 is formed.

This invention has the above configuration, and its operation will be explained next.

Both holding means8. Electromagnets 31 and 37 of J] are energized when all four inputs of corresponding Boo) Gl and G2 become 11, and are demagnetized when one of them becomes L, but
In the normal case, as described below, Boo) G3, G4,
Since all three inputs from G7 are set to I, whether to energize or de-energize is determined by the output state of flip-flop 12F1.

Therefore, during normal sewing, needle bar 4. The 6° take-up arm 12 reciprocates along the timing curve shown in FIG. The forward movement of the extending arm] 2 to the right in Fig. 2 is performed by both holding means 8,
11, the output of gate Gl becomes Il, the output of G2 becomes I-1, and the output of gate G2 becomes I-1.
1 is demagnetized, the electromagnet 37 is energized, one holding means 8 releases the needle thread 111, and the other holding means 11 holds the needle thread T. The needle thread '1' corresponding to the increasing needle thread path is fed from the spool 5 between the two holding means 8, 11. At this time, Pooh! J-21 rotates as the needle thread T moves, and the feed detection device 9 generates a number of clock pulses proportional to the rotation angle. This clock pulse is counter 7
9 and input to one input section of the comparator circuit 78. Further, the other input section of the comparator circuit 78 receives a feed amount signal X and an amplitude signal Y read out from the storage circuit 66.
The output (theoretical value) C of the subtraction device 77, which is corrected by subtracting the output value from the error calculation device 65 from the value calculated by the setting device 75 based on the Ichihara signal from the Ichihara detection device 62, is input. Therefore, the comparator circuit 78 outputs a signal by a factor of 1 when the count value of the counter 79 coincides with the theoretical value.

As a result, the output of the flip-flop FF+ is reversed from L to H, so that the electromagnet 31 is energized and the electromagnet 37 is demagnetized.

Therefore, after the needle thread T of a predetermined length is reeled in between the two holding means 8 and 11, the first holding means 8 holds the needle thread 'F so that it cannot pass through and prevents it from being paid out from the bobbin 5. At the same time, the second holding means 11 releases the needle thread III so that it can freely pass through. Note that if the needle thread T of a predetermined length is paid out during the forward movement of the feeding arm 12, during the subsequent forward movement of the feeding arm 12, the needle thread T loosened between the second holding means 1 and the needle 3 is removed. are both holding means 8,
Temporarily pulled back between 11 and 11.

Furthermore, since the feeding arm 12 returns to its original position before the needle thread '1' is tensioned by the thread take-up lever 6, the first holding means 8 and the needle thread between the stitches are T is 4
The stitches are gradually tightened, which tightens the seams to the appropriate strength and knots. Thereafter, the same action is repeated every time one stitch is formed.

As described above, the feed amount signal X and the amplitude signal Y.

The required amount of thread calculated based on the Ichihara signal 1] is fed out each time one stitch is formed, but the regular amount of thread is not required for the first few stitches. Therefore, after turning on the power ((When sewing starts, the flip-flop 1"N ph 2 is preset, and the counter 83 is also set by the star 1 signal, so the falling edge of the signal from the position detection device 61 is 5
Until the number of times is counted, that is, until 5 stitches are formed, the output of gate (3) becomes L, and as a result, Boo 1-Gl and 02 are closed, so electromagnets 31 and 37 remain demagnetized. It doesn't work.

Furthermore, the flip-flop FF2 is reset when the sewing machine is stopped, but when the cloth is taken out from the seam or the position is shifted, the needle thread T is let out from the bobbin winder 5, and the pulse signal from the let-out detection device 9 causes the needle thread T to be let out again. Once the sewing machine is set, when sewing is started thereafter, the electromagnets 31 and 37 remain demagnetized until five stitches are formed, as described above, and normal feeding is not performed.

If the sewing machine stops near the lowest point of the needle bar in order to rotate the fabric around needle 3, gate G4 will not be activated even if the presser foot is raised.
Since the output of 8 remains unchanged at 1, both holding means 8.
The condition of J1 remains the same as before the sewing machine stopped, and 111 bimin/
If you start the sewing machine later, the scheduled stitch [21] will continue to be formed, but if you stop the sewing machine at the 2nd-4th point of the lever to remove the fabric from the seam, if you raise the presser foot, Gate G
The output of 4 becomes 1-1, which causes Boo 1-01. G
2 is closed, the electromagnets 31 and 37 are demagnetized and both holding means 8 and 11 release the needle thread '1'. Regarding the holding means 8, in the former case, since the holding plate 32 is attracted by electromagnetic force, the link 5 is moved in conjunction with the cam body 48.
4 is rotated clockwise in FIG. 2 and the connecting rod 56 is pushed up, the spring 58 is only compressed.
It is interlocked with the linking rod 59 via Lli+f+ and moves upward with Lli+f+ 34 as a fulcrum.

When the bobbin winding device 93 is brought into operation for seven strokes, the counter 86
And the memory circuit 90 is erased seven times. Then, when the minon is started while appropriately setting the bobbin winding amount setting device 89, the feed line '1' is wound around the bobbin thread bobbin 104 from the bobbin 5, and the yarn amount is determined by the feed-out detecting device 9 and the collar/carrier. Recorded via 8G: 1. When the winding amount reaches the set point, the output of the comparator circuit 88 causes the motor stop circuit 95 to stop the cutting/moulding. 7.2. The amount of thread consumed during sewing is detected by the feed-out detection device 9 and the counter 87, and when the amount of thread reaches the amount of thread previously wound on the bobbin thread bobbin 94, the comparison circuit 9J The alarm device 92 operates for a certain period of time in response to the output of , and the sewing machine motor is stopped via the motor stop circuit 95.

If the needle thread T is completely consumed or broken during sewing and the output of the feed-out detection device 9 stops, the flip-flop ]・l f, N 4 will not be set, so the position detection device 61 will not be set. The two outputs are counted by the counter 85, and if the output of the feedout detection device 9 is not generated even once during the period corresponding to the set value, that is, during the three rotations of the main shaft 2, then the gate G5 is The output is f
-1 Because of the loud noise, the sewing machine is stopped via the motor stop circuit 95, and the alarm device 92 is activated for a certain period of time.

G2 closes and electromagnet 31. , 37 are also demagnetized.

- As mentioned above, when the power is turned on and the sewing machine is not at °C, or even after the power is turned on, when the sewing machine is placed near the top dead center of the needle bar and the presser foot is raised, or when the needle thread is When T is cut or consumed, the electromagnets 31 and 37 are demagnetized and the holding force of the needle thread by both holding means 8 and 11 is released, so when setting the needle thread 'P, these In this state, first pull out the needle thread T from the bobbin spool 5 by pinching its end, then wrap the middle part around the cover 60 and pull it lightly.A downward component of force is generated on the needle thread ``1''. Part is cover 6
Slide down the sides 60a, 60b, 60c of 0, and then 9
Nofu-1) It is wrapped around -21.

In addition, if the sewing machine is driven without feeding the needle thread '1', the way the thread is coming out of the feed-out detection device 9 will not be input to the flip-flop 'h' 3 after it has been reset by the sewing machine star 1 signal. Since the Q output is 11, h
When the main tQI+2 rotates by the number set in the counter 84, the gate (output of j4 or I) is activated. Therefore, in this case, the alarm device is activated after the kl-1i11112 rotates seven times, and the electromagnet 31.37 is demagnetized.

In addition, in the above embodiment, the set value of the counter 84? "
This is regardless of whether the needle thread T is set or not, from the start of sewing until five stitches (the set value of the counter 83 in this embodiment) are formed. This is because the electromagnets 31 and 37 remain demagnetized and normal feeding is not performed, so it cannot be determined whether or not the needle thread T is set unless the set value of the counter 84 is made larger than the set value of the counter 83. . Therefore, it is important to note that the set value of the counter 84 should be thicker than the set value of the counter 83.

In the above embodiment, the feed signal and the swing 11 signal written in the memory device are read out every rotation of the main IT+11, and these signals are used to prompt the feed signal 4'f4 and 4'f4.
The movement of the swing mechanism is controlled every stitch to a predetermined 1・λ.
In a sewing machine of the type that can sew the following items, Q
Each of the above signals or signals read from the device [
The feedout signal υ was calculated for each stitch formed based on the thickness signal output from the thickness detection device in response to changes in the vertical position of the presser foot. Alternatively, the corresponding yarn amount data is read out based on the sending signal and swing width signal, or these and the thickness signal from a group of light amount data that has been experimentally determined in advance and stored in the storage device for each condition of different thickness. It's okay.

Further, in the above embodiment, a sewing machine is shown in which the feed mechanism and the needle adjustment mechanism are controlled 101'' based on the feed signal and the swing signal stored in the storage device. Feed go and needle swing ffi can be done manually by a person! It can also be applied to sewing machines that control lr. And in this case, the feed amount and O-button t':
, from the F43 output signal or the detection signal of Ii I* in the same way as described above, or you can determine it experimentally in advance. It may also be possible to read out one day of the corresponding thread while receiving the stored thread paper data.

In addition, although the above embodiment is applied to a zigzag stitch sewing machine in which the sub rod is pulsated in a direction crossing the cloth feeding direction,
The present invention may be applied to a sewing machine in which a zigzag stitch pattern can be made on a shelf by moving A1j to the x-y coordinate axis force with respect to a needle bar that moves up and down at a fixed position.

In this case, as is well known (the cloth is moved in the direction of the X coordinate axis and the
It is equipped with three independent power sources, such as motors, for movement in the direction of the coordinate axes. -The amount of needle thread required to form a seam is expressed as the square root of the sum of the square value of the amount of fabric movement in the X-coordinate axis direction and the square value of the fabric movement amount in the Y-coordinate axis direction, if Ichihara is ignored. Therefore, instead of the feed signal and swing width signal of this embodiment, signals for controlling the rotation speed and angle of each of the motors described above may be used.

As described above, the present invention detects the position so as to cut off the power to the sewing machine motor in response to the fact that the thread amount signal is generated once and then is not generated in spite of the generation of the position signal. In a sewing machine equipped with a motor stop circuit associated with a feed-out detection device, if a thread amount signal is not generated from the start of the sewing machine despite the occurrence of position 13, it is necessary to By installing a control circuit that allows the sewing machine to continue running, the sewing machine can be driven without cutting the needle thread seven times, which reduces the noise caused, and during the durability test, the needle thread gets tangled in the hook (=J) or 61 threads are cut and the machine stops sewing. It is possible to prevent decimals from being left as they are, and it also has the effect of making it easier for the user to make adjustments.

In addition, in this example, after the sewing machine is moved
In a sewing machine in which the needle thread is not supplied from the bobbin 5 to the needle take-up lever 6 until seven marks are formed, the newsletter device However, in a sewing machine in which needle thread is paid out from the first button and fed to the thread take-up when the sewing machine is driven, a thread amount signal is not generated from the first button when the sewing machine is driven. Sometimes the alarm device may be activated immediately, or in particular the alarm device may not be activated.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view of the sewing machine head, Fig. 2 is a perspective view of the needle thread supply device, Fig. 3 is a partial front view of the needle thread supply device, and Fig. 4 is a partial perspective view of the sewing machine head.
5 is a longitudinal sectional view of the first holding means, FIG. 6 is a longitudinal sectional view of the second holding means, FIG. 7 is a longitudinal sectional view of the thread tension regulator, Figure 8 is a block diagram of the electric circuit, Figure 9 is a block diagram showing an example of the setting device, and Figure 10 is a block diagram of the electric circuit.
The figure is a time chart, and FIG. 11 is a diagram showing the relationship between the theoretically required payout length of one gold thread and the length of one gold thread that is actually paid out. Applicant's name: Tokyo Heavy Equipment Industry Co., Ltd.

Claims (1)

[Scope of Claims] A one-way sewing machine motor that can be driven in connection with a starting operation, a position detection device that is arranged in relation to a main shaft that is linked to the sewing machine motor and generates a position signal every time the main shaft rotates by a specific angle, and a balance. A feed-out detection device is arranged in the needle thread path "f" between the needle thread supply source and the side thread supply source, and generates a different thread h↓ signal corresponding to the amount of thread fed out from the needle thread supply source to the thread take-up, and also generates a position signal. Regardless of the fact that the thread amount signal is not generated after being generated once, the position detection device and the reel H! In a sewing machine equipped with a motor stop/start circuit associated with an L detection device, a control circuit is provided that continues to energize the motor when no thread signal is generated from the time the sewing machine is started despite the generation of a position signal. A sewing machine drive control device characterized by: