JPS5919710B2 - Sewing machine cloth control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for detecting fabric at a fixed reference line that is arranged in front of a sewing machine sewing section in the cloth feeding direction, is spaced to one side with respect to the cloth feeding line passing through the sewing section, and is parallel to the cloth feeding direction. A sensor that detects the presence or absence of an edge to be sewn along the fabric feeding direction and generates a respective signal, and a sensor that is placed in front of the sensor in the fabric feeding direction and responds to the sensor's signal to calibrate the sewing area around an axis parallel to the fabric feeding direction. Regarding a fabric control device for a sewing machine that is equipped with a manipulator that has a rotating body that can rotate in reverse at its free end and presses the rotating body against the upper surface of the bed, it is particularly capable of sewing stitches along edges to be sewn in two directions with different elongation rates. The present invention relates to an apparatus for forming the present invention.

Conventionally, when a manipulator presses a cloth and guides the cloth by the rotation of its rotating body, the cloth between the seam part and the manipulator is stretched in the cloth feeding direction and fed into the seam part to form a seam. However, when sewing the edges to be sewn along the directions of different stretch rates in a fabric with different stretch rates depending on the direction of the fiber composition, for example, by sandwiching the edges to be sewn with tape, the degree of stretch between the suture part and the manipulator will depend on the direction of the edges to be sewn. are different, that is, sections with a large expansion/contraction rate are expanded a lot, and sections with a low expansion/contraction rate are expanded a little.

While being sewn, a certain tension was applied to the tape sandwiching the edge to be sewn, so even if the elongation of the edge to be sewn changes depending on the seam formation section, the elongation of the tape does not change. As a result, wrinkles occur between the sewn tape and the cloth, and the seams become uneven, resulting in drawbacks that significantly reduce the quality of the product.

This invention aims to eliminate the drawbacks of the above-mentioned conventional ones.

An embodiment of the present invention will be described with reference to the drawings. A sewing machine 1 interlocks with a motor (not shown) and uses two needles 2 and a part of a looper (not shown) to stitch two chain stitches N (12
This is a well-known decorative stitch sewing machine that forms a sewing machine (see Fig.), and the feed dogs that protrude and retract above the feed groove 4 of the throat plate 3 consist of a plurality of rows of main feed dogs 5 and a row of sub feed dogs 6, and these are always By the action of the air cylinder 8 below the bed 7, which has the same feed amount, the auxiliary feed dog 6 is connected so that the feed amount is greater than that of the main feed dog 5, making so-called differential feed possible.

In front of the bed I in the cloth feeding direction, there is a main cloth holder 9 which is gently curved in the cloth feeding direction, and a secondary cloth which is connected to the curved surface of the table 9 and slopes upward in the cloth feeding direction. The receiver is placed with a stand 10, the main and sub-cloth receivers are with stands 9 and 10, and an undershirt (running shirt) is placed on the side of the bed 7.
A carrier 12 is disposed that grips the hem of the body W and moves forward in the cloth feeding direction by the action of an air cylinder 110.

A presser foot 13, which faces above the feed dog and is fixed to the lower end of the presser bar that moves up and down by the action of an air cylinder (not shown), is pressed against the top surface of the bed 7 at the front in the material feeding direction by the action of an air cylinder (not shown). The manipulator 14 (
The gear 16 at the tip is moved by the detection signal of the sensor 15 so that the edge of the cloth side is always positioned on the sensor 15 arranged between the presser foot 13 and the presser foot 13. The body W is moved in a direction crossing the cloth feeding direction by rotating forward and backward.

A binder 17 fixedly placed in front of the presser foot 13 in the cloth feeding direction gradually folds the tape T into three layers as shown in FIG. drawn out.

Regarding the cloth carrying device 18, the shoulder portion w1. of the body W held on the carrier 12. This is to send one side of w2 to the seam section before sewing starts, and is a holder 1 fixed to the surface of the sewing machine 1.
A frame body 20 is supported rotatably around a vertical axis at 9, and this frame body 20 can be elastically locked in an operating position where an engaging piece 27, which will be described later, faces above the bed surface in front of the suture part. The stopper locking piece 36 is supported on the machine frame.

The upper end of an air cylinder 21 is rotatably supported on this frame 20 by a horizontal shaft 22, and the lower end of the plunger 23 has a protrusion 25 that loosely fits into an L-shaped groove cam 24 formed on the frame 20. A main and sub-engaging piece 2 is fixed at the lower end of the actuating piece 26 and is elastic and has an uneven lower end surface.
7a and 27b are overlapped and fixed vertically.

The free ends of both engaging pieces 27a and 27b are formed in a sword-point shape along the leading edge and one side edge in the cloth feeding direction of the shoulder portion W1 of the body W, and are slightly inclined downward, and are always is separated upward from the top surface of the bed 7.

When the pin 25 moves along the grooved cam 24 in conjunction with the lowering of the operating piece 26 by the action of the air cylinder 210, the free end of the main engaging piece 27a touches the edge of the shoulder W1 when moving along the vertical portion 24a. Both free ends of the sub-engaging piece 27b descend to the upper surface of the bed and come into pressure contact with each other so that the free end of the sub-engaging piece 27b engages with the shoulder W1 on the inside of the sub-engaging piece 27b. Feed the fabric toward the front in the fabric feeding direction of the presser foot 13 so that one side edge of part W1 crosses the fabric feeding line passing through the seam part and inserts it inside the crease of the tape T folded into three by the binder 17. horizontal movement in the direction crossing the direction (direction of arrow a in FIG. 7).

Regarding the cloth guiding device 28, the main engaging piece 2 of the cloth carrying device 18
When 7a is lowered onto the bed 7, guide holes 29 are formed vertically through the upper surface of the bed 1 at three outer positions along the leading edge in the cloth feeding direction and one side edge of the free end. An operating plate 31, which has three cylindrical protrusions 30 upright that can be retracted and retracted upward from the upper surface of the bed through the guide hole 29, is rotatably supported around a horizontal axis with respect to a support plate 32 fixed to the lower surface of the bed 1. A coiled spring 33 is attached to each protrusion 30.
Wrap it around.

The plunger 35 of the air cylinder 34 fixed to the machine frame can be engaged with the action plate 31, and its action causes the action plate 31 to
is rotated to bend the coiled spring 33 between it and the bed 7, while causing the protrusion 30 to protrude above the bed I through the guide hole 29.

Regarding the auxiliary presser device 37 (Fig. 1), a rod-shaped suppressor 39 whose intermediate portion is rotatably supported on the machine frame by an axis 38 perpendicular to the cloth feeding direction is bent at one end to form a presser portion 39a. This presser foot part 39a is arranged opposite to the upper surface of the throat plate 3 on one side of the presser foot 13 in front of the cloth feed direction, and the other end which stands up upward is bent along its own axis of rotation to engage the presser foot 39a. A U-shaped fitting portion 39C with a gap is protruded horizontally from the fitting portion 39b.

This pressing body 39 is always subjected to an elastic force in the rotating direction (clockwise in FIG. 1) so that the pressing part 39a is pressed against the upper surface of the throat plate 3 by a winding spring 40 whose one end is fixed to the machine frame. There is.

A connecting rod 43 is fixed to a plunger 42 of an air cylinder 41 fixed to the machine frame, and the connecting rod 43 has a guide portion 43a that slopes downward.
penetrating into the gap C and facing the lower end of the engaging portion 39b;
As the plunger 42 rises due to the action of the air cylinder 410, when the inclined guide portion 43a engages with the lower end of the engaging portion 39b of the pressing body 39 due to the rising of the connecting rod 43, the engaging portion 39b moves upward due to its inclination. In response to the component force in the side direction (forward in the cloth feeding direction), the pressing body 39 resists the elastic force of the coiled spring 40 and moves counterclockwise so that the pressing portion 39b is separated upward from the throat plate 3 (FIG. 1). Rotate to.

Further, the presser foot 13 of this embodiment has a main portion 13a facing the main feed dog 5 and a presser portion 39 of the presser body 39 from the outer end thereof.
an extension part 13b extending along the cloth feeding direction to the side of a; is a hammer portion 13C extending laterally to the holding portion 39a along the extension portion 13b.
It is composed of

In addition, the throat plate 3 corresponds to the main feed dog 5, and the front side of the needle drop point in the cloth feeding direction is lowered by the thickness of the tape T to form a stepped portion 3a.
The bent lower end of the tape T can be inserted to facilitate the loading of the body W by the engagement piece 27 of the loading device 18 and to prevent the tape T from turning over (FIGS. 5 and 6).

Regarding the tape tension device 44 (FIG. 2), a pair of support stands 45 are fixed to the front side of the sewing machine 1, and three tape guide rods, which will be described later, are provided on each support stand 45.

In both of the support stands 45, a fixed guide rod 46 that stands up on one side of the moving path of the tape T moving along a linear path is fixed to each support stand 45, and a vertical axis is attached to each support stand 45. The rotary bodies 41 are individually supported so as to be rotatable around the center.
A first guide rod 48a facing one side of the linear movement path of the tape and a second guide rod 48b facing the other side are erected and fixed to the rotary body 47 in the same way as the fixed guide rod 46, and the tape T When the tape T is transported along a straight path, the first and second guide rods 48a of the rotating body 47 in the forward direction of the tape T movement direction are
t b and the second guide rod 48 of the rotating body 47 in the forward direction of movement.
b does not touch the tape T.

A plunger 50 of an air cylinder 49 fixed to the machine frame is connected to an actuating body 51 connected to the rotating bodies 47 of both support stands 45, and when the actuating body 51 is actuated, the first and second guide rods 48a.

Rotating body 4 so that 48b intersects the moving path of tape T.
7 by a certain angle, and the tape T is connected to the fixed guide rod 46.
and the second guide rod 48 a t b to be bent into an L-shape to apply a predetermined tension.

Regarding the tape cutter device 52 (FIG. 1), presser foot 1
At the rear of the sewing machine 1 in the cloth feeding direction, a fixed blade 53 is fixedly arranged on the bed 7 so as to intersect with the cloth feeding direction and facing the moving path of the tape T sewn to the body W. A movable blade 55 supported rotatably around an axis 54 along the axis is connected to an electromagnet 56 whose base end is fixed to the machine frame.
The blade portion 55a at the tip faces above the fixed blade 53, and when it rotates due to the action of the electromagnet 56, the tape T moving on the fixed blade 53 can be cut by the cooperation of both.

Regarding the blower device (FIG. 1), two pipes 57 and 58 fixed to the frame 20 of the carrying device 18 have their proximal ends connected to a compressed air source (not shown) with a solenoid valve V9. The open end of one of the tubes 51 is connected to the engagement piece 27 via v1o.
The lowered position of the pipe 58 is opposite to the upper part and is located close to the cloth feed line passing through the seam portion, and is arranged so as to open downwardly along the direction crossing the cloth feed direction, and the other tube 58 is arranged so as to open downwardly toward the cloth feed line passing through the seam part. The holes are arranged downward along the feeding direction.

The cloth sensor 59t60at60b is a light source (not shown)
The presence or absence of cloth on the bed 7 is detected by receiving the light, and a cloth detection signal for each state is generated.

The cloth sensor 59 is arranged on the side of the manipulator 14 in front of the guide hole 29 of the bed 7 in the cloth feeding direction, and is used to detect when the shoulder part w1 of the body W is arranged along the protrusion 30 at the beginning of sewing. Yes, sensor 60at6ob
are arranged at a distance in front and back in the cloth feeding direction on the side of the presser foot 13, and are used to set the activation timing of the electromagnet 56 of the tape cutter device 52, and only one of them is selectively effective at any time. be converted into

That is, the sensor 60a at the rear in the cloth feeding direction is used when cutting the body W with the tape T protruding a predetermined length from the leading edge of the cloth, and the sensor 60b at the front in the cloth feeding direction is used when cutting the tape T from the rear edge of the cloth of the body W. Used when cutting with a predetermined length protruding.

It should be noted that the sewing machine of this embodiment is designed to always stop in accordance with the needle down position.

Next, the electric circuit of this embodiment will be explained.

In the figure, V to VIO are the solenoid valves of each air cylinder, vl is the solenoid valve of the air cylinder 21 of the cloth carrying device 18, V2 is the solenoid valve of the air cylinder 34 of the cloth guide device 28, and v3 is the solenoid valve of the air cylinder 34 of the cloth guide device 28. V4 is the solenoid valve of the air cylinder (not shown) for pressing the manipulator 14 against the upper surface of the bed 1; V5 is the solenoid valve of the air cylinder 11 for operating the commercial carrier 12; Solenoid valve, V6 is air cylinder 8 for differential feeding
V7 is the solenoid valve of the air cylinder 49 of the tape tension device 44, V8 is the solenoid valve of the air cylinder 41 of the auxiliary holding device 37, and V9 is the solenoid valve of the air cylinder 41 of the blower device 5.
A solenoid valve that opens and closes the air flow generated at 7, Vlo is a pipe 58
This is a solenoid valve that opens and closes the air flow generated in the air.

These solenoid valves 1 to VIO are activated or deactivated individually under the control of the respective solenoid valve control circuits C1 to C1o.

In particular, the control circuit C5 of the air cylinder 11 of the commercial carrier 12 controls the solenoid valve V5 so that the carrier 12 moves at approximately the same speed as the moving speed of the body W driven by the sewing machine.

2 is a buzzer that generates an alarm, and the buzzer control circuit C1
Sound is generated intermittently during the time set by the operator under the control of □.

The electromagnet 56 of the tape cutter device 52 is energized for a certain period of time and then deenergized under the control of the electromagnet control circuit C1°.

M is a motor connected to the sewing machine main shaft (not shown), which is driven or stopped under the control of the motor control circuit C13, and when driven, is driven by a drive current from either the low-speed drive circuit D1 or the high-speed drive circuit D2. Ru.

The low speed drive circuit D1 drives the motor M at a constant low speed, and the high speed drive circuit D2 drives the motor M at either medium speed or high speed specified by the speed setting circuit.

The speed setting circuit is set with driving speeds in sewing sections X and y, which will be described later, and these speeds are set so that x>y.

X and Y are stitch number setting circuits that respectively set the number of stitches to sew the straight section The number of stitches can be set.

El and E2 are comparison circuits that count the position signal from the needle position detection means P (one pulse is emitted per rotation of the main shaft of the sewing machine), and the count value of El matches the number of stitches set by the number of stitches setting circuit X. When this occurs, a coincidence signal is generated, and E2 starts counting position signals in relation to the generation of the coincidence signal from El, and when the number of stitches set by the setting circuit Y and the counted value match, a coincidence signal is generated.

F is a switching circuit, which is a control circuit C6 for solenoid valves v6 to v9.
The operation timing is selectively set in one of the sewing sections X or y so that C9 and the high-speed drive circuit D2 are activated when a stitch is formed in a predetermined one of the sewing sections X or y.

S is a solenoid valve v6. that operates the differential feed and tape tension device. This is a selection switch to enable or disable V7.

T□~TIO are respective set times △t1~△tl
In particular, T1tT6tT9 is a timer circuit with a setting time that can be adjusted from the outside, and T3 is a timer circuit in which the shoulder W1, which is held between the bed 1 and the engagement piece 27 of the carrying device 18, is connected to the feed dog 5. , 6 until the first needle drops, and T4 is set so that its own set time expires after the set time of T3 expires.

The present invention has the above-mentioned configuration, and the operation of this embodiment will be explained based on the time chart shown in FIG. 15.

In the initial state, both the solenoid valves V2 and V3 of the air cylinder (not shown) that raises and lowers the presser bar and the air cylinder 34 of the cloth guide device 28 are open, and the presser foot 13 is moved upward and away from the throat plate 3, and is activated. A protrusion 30 of the plate 31 protrudes upward from the guide hole 29 of the bed 7.

Set the selection switch S to the "enabled J" side.

When the tip of the shoulder part W1 of the undershirt W is placed along the protruding part 30 as shown in FIG. The solenoid valve V is opened so that an opening sound of a set time Δt1 of T1 is generated intermittently and an air flow is generated in the pipe 51.

The wrinkles of the shoulder W1 along the protrusion 30 are smoothed out by the air flow from the pipe 5T, and the shoulder W1 is brought into close contact with the upper surface of the bed 1, and Δt1
After the elapsed time, the buzzer 2 stops sounding, the solenoid valve V9 closes, and the solenoid valve V□ of the air cylinder 21 of the carrying device 18 closes.
and close the solenoid valve v2 of the air cylinder 34 of the cloth guide device 28.

The protruding part 30 descends below the bed 7, and the pin 25 is guided by the vertical part 24a of the grooved cam 24, and the main and sub-holding pieces 27a, 2
7b descends and presses the shoulder W1 between the upper surface of the bed 7, and the pin 25 is guided by the horizontal part 24b, and the main and sub engaging pieces 27a and 27b move in the direction of the arrow in FIG. One end of the shoulder W1 between the upper surface and the cloth feeding direction is inserted into the fold of the tape T, and the leading edge thereof is arranged to correspond to the leading end of the presser foot 13 (FIG. 7 W1).

In this state, since the side edge of the undershirt W is located on the sensor 15 (FIG. 7), a cloth detection signal is generated from the sensor 15, and this signal closes the solenoid valve v3 and lowers the presser foot 13. Open the solenoid valve V4 of the air cylinder (not shown) of the manipulator 14 and open the gear 1 at the tip.
6 hold the body part W and press it against the surface of the bed 7 with an appropriate force, and timers T2 t T3 are set.

After Δt2 of the timer T2 has elapsed, the output of the motor control circuit C13 drives the motor M at the low speed set by the low-speed drive circuit D1, and also acts on the switching circuit F to change the straight section X of the undershirt (Fig. 13). ), and at the same time open the solenoid valve VIO of the pipe 58 to generate an air flow in the forward direction of the cloth feeding direction to sew the body W on the bed I.
The timer circuit T4tTs is also set.

The sewing machine 1 is driven at low speed for a period of Δt4 after being started, during which time the body W and tape T are transferred to the sewing part by the feed dog, and a seam is formed at the tip in the cloth feed direction almost at the same time ( To be exact, when the needle descends to the lower position), the set time Δt3 of the timer circuit T3 ends, the solenoid valve v1 of the air cylinder 21 closes, the engagement piece 27 of the carry-in device 18 returns, and immediately after that, When the set time Δt4 of the timer circuit T4 ends and the high-speed drive circuit D2 is activated, the circuit D2 supplies current to the motor M so as to drive the motor M at the high speed specified by the speed setting circuit. Thereafter, the leading edge of the body W reaches the sensor 60a, generates a detection signal, and sets the timer circuit T6.

Immediately after that, the set time Δt5 of the timer circuit T5 ends and the solenoid valve v5 of the air cylinder 11 of the carrier 12 is opened.
The carrier 12 moves forward in the cloth feeding direction at approximately the same speed as the movement speed of the body W by the sewing machine 1.

When the set time Δt6 of the timer circuit T6 ends, the electromagnet 5
6 is energized, the movable blade 55 of the tape cutter device 52 rotates and cuts the tape T protruding from the tip of the cloth of the body W in cooperation with the fixed blade 53.

When the sewing machine is started, the gear 16 of the manipulator 14 controls the movement of the body W in a direction intersecting the cloth feeding direction, based on the cloth detection operation of the sensor 15, so as to feed the side edge of the body W to the seam part. Furthermore, the comparison circuit E1 is connected to the needle position detection means P.
Count the needle position signals from.

When the counted value matches the number of stitches set in the stitch number setting circuit When a matching signal is generated from the comparator circuit E1, the comparator circuit E2 is activated, and the switching circuit F is switched to the circuit state for sewing the curve section y. Control.

In addition, the output controls the control circuits C6 to C9 to each solenoid valve V6.
~ Control so that V9 opens.

It is difficult to stitch this curve section y.

That is, the gear 16 of the manipulator 14 controls the cloth so that the cloth side edge is always positioned on the sensor 15, so that when the cloth side edge has a large curve, the cloth feed of the sensor 15 is controlled as shown in FIG. The fabric side edge on the front side of the fabric moves outward with respect to the fabric feed line passing through the seam portion (double-dashed line).

Therefore, the body W fed into the stitching portion may be deviated from the folds of the tape T, or may be sewn in a deviated state.

However, here, the speed of the sewing machine motor M is lowered to facilitate cloth control by the manipulator 14, and the solenoid valve v9 of the pipe 57 is opened to direct the air flow in the direction of the arrow g (
9) on the body W on the bed T, the solenoid valve v8 is opened, the press body 39 of the auxiliary presser device 37 rotates, and the presser section 39a feeds the cloth against the presser foot 13. By pressing the body W against the surface of the bed 7 on the side in front of the direction, a rotation moment is applied to the body W in the counterclockwise direction (FIG. 9) around the presser part 39a, and
Due to this airflow and rotational moment, the body part W between the sensor 15 and the seam part receives a force acting in the direction of the cloth feed line, causing its edge to lie along the inside of the folded part of the tape T.

When the body W is moved in the direction of the cloth feeding line by this presser foot 39a, in front of the presser foot 13 in the cloth feeding direction,
When the extension part 13b of the presser foot 13 is not present (as shown in FIG.
However, if the extension part 13b is provided as in this embodiment, the body part W is held down by the extension part 13b, so no large wrinkles are formed.

Furthermore, it is well known that undershirts are made of knitted fabric that is stretchable in one direction, and that this knitted fabric is sewn to stretch in the horizontal direction. If the same presser foot pressure is applied when sewing the curved section y along the curved section y, the fabric will be sewn together with the tape T while being stretched when sewing the curved section y, so the net feed amount between the body and the tape will be different and the stitching will be Since the body W shrinks after being sewn, wrinkles are generated.

Therefore, as in this embodiment, the feed amount of the sub feed dog 6 which opens the solenoid valve v6 of the air cylinder 8 and transfers the body W while sandwiching it between the diameter part 13C of the presser foot is larger than that of the main feed dog 5. When "differential feeding" is performed so that the body part W is fed, the degree of elongation of the body W is reduced.

In addition, the solenoid valve v7 of the air cylinder 49 is opened to operate the air cylinder 49, and the rotating body 47 of the tape tension device 44 is
When the first and second guide rods 48a and 48b intersect the movement path of the tape T and bend the tape into a "<" shape, tension is applied to the tape T and the gap between the tape T and the sutured portion is The tape is transferred to the suture area while being stretched.

Due to the synergistic effect of the reduction in the elongation of the body W due to the differential feeding and the elongation of the tape due to the tape tension, the amount of elongation of the body W and tape T during stitching is equalized, and no sewing wrinkles are generated on the body W after stitching.

After switching the switching circuit F, the comparator circuit E2 counts the needle position signal from the needle position detection means, and when the counted value matches the number of stitches set by the number of stitches setting circuit Y, that is, between the curve section y and the next straight line. When the border with section X reaches the sutured part, comparison circuit E2
A coincidence signal is generated from , the switching circuit F is switched to the circuit state for sewing the straight section X, and the solenoid valve v6. V7. V9 is closed, the differential, tape tension, and feed blower are made inactive, and the speed setting circuit K is controlled to drive the motor M at high speed again.

, (but the comparison circuit E1 is not enabled.

) When the rear edge of the body W in the cloth feeding direction passes the sensor 59, the detection signal sets the timer circuit T7, and the high-speed drive circuit D2 becomes inactive for the set time Δt7, and the low-speed drive circuit D1 starts the motor. After M is driven at a predetermined low speed, the rear edge of the body W passes through the manipulator 14, and further, when the sensor 15 detects the cloth rear edge of the body W, the timer circuit T8 is set by the detection signal, and the timer circuit T8 is set. During the time Δt8, the set time Δt7 of the timer circuit T7 ends, and the high-speed drive circuit D2 drives the motor M at high speed again.

While the body part W was being pressed by the manipulator 14, it was stretched and fed between the seam part by the pressing force, but when the rear end passed through the manipulator 14 and the pressing force was released, the body part W was temporarily stretched. is contracted and then returns to a steady state.

In this embodiment, after the body W returns to a steady state, t7 ends at the time set by the timer circuit T7, and the sewing machine is then driven at high speed.

Immediately after the motor M is driven at high speed, the set time Δt8 of the timer circuit T8 ends, the solenoid valve v4 closes, and the manipulator 14 is separated upward from the upper surface of the Pez door.

The sensor 60b detects the rear end of the body W, and the timer circuit T9 is set based on the detection signal, and the set time Δt
9 is completed, the solenoid valve 5 of the air cylinder 11 is closed to return the carrier 12, and the electromagnet 56 is energized to operate the movable blade 55 of the tape cutter device 52 to cut the back end of the body W. At the same time as cutting the continuous tape T, the solenoid valve v2 is opened and the air cylinder 34 of the cloth guide device 28 is activated to rotate the actuating plate 31 so that the protrusion 30 protrudes from the guide hole 29 of the bed 7. At this time, it acts on the motor control circuit C13 to stop the motor M and stop the sewing machine 1 at the needle down position.

(The fixed position stopping means is not shown because it is well known.

) At the same time, the solenoid valve V5 of the air cylinder 11 of the carrier 12 closes and returns to its original position, closes the solenoid valve VIO of the pipe 58 to cut off the air flow, and further closes the solenoid valve VIO of the air cylinder 41 of the auxiliary presser device 3T. Valve V8 closes and pressing body 39 returns to its original position, and at the same time sets timer circuit TIO.

Since the suppressing body 39 acts until the end of this sewing, cloth feeding after the rear edge of the body W passes through the manipulator 14 is stabilized.

That is, as is clear from FIG. 10A, only the sub-feed dog 6 directly engages the body part W before the needle drop point in the fabric feed direction, and this sub-feed dog 6 is used to feed the fabric past the needle drop point. Since the body part W is located outward from the line, an outward rotational moment is applied to the body part W, and from the time the body part W passes through the rear edge force manipulator 14 to the time it is sent to the seam part, the left side in FIG. 10 ( The tape T comes off from inside the folded part as it is being pulled towards the left side in FIG. It acts to apply a moment so that the edge of the body W is always located within the folded part of the tape T.

After that, the set time △t□ of the timer circuit T1o.

When this is completed, the solenoid valve V3 is closed and the presser foot 13 is separated above the throat plate 3.

When you want to use the front side of the seam widely for threading or other tasks, remove the frame 20 of the fabric loading device 18 from the locking piece 36 and rotate it toward the rear of the sewing machine about the vertical axis. By making it wider, tasks such as threading become easier.

As described above, according to the present invention, when the portion of the edge to be sewn along the direction of high expansion/contraction rate is fed into the sewing part, the feeding movement of the sub-feeding dog is made larger than the feeding movement of the main feeding dog. By increasing the amount of feed, so-called differential feeding, even if the edge to be sewn is elongated with respect to the tape between the sewn portion and the manipulator, the sub-feed dog can feed more fabric to the sewn portion. Since the cloth and the tape can be fed into the cloth, there is no misalignment between the cloth and the tape, and there are no wrinkles or uneven seams between the two sewn together, resulting in the effect of significantly improving the quality of the product.

In this embodiment, the feed amount is controlled by dividing the sub-feed dog into two stages, but the feed amount may be controlled by dividing the sub-feed dog into multiple stages or stepless.

Furthermore, in this example, the edge of the cloth to be sewn is sewn between tapes, but the same effect can be achieved even if the stitch is formed along the edge of the cloth without tape. is obtained.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the sewing machine of this embodiment as seen from the rear side, Fig. 2 is a perspective view of the sewing machine as seen from the front side, Fig. 3 is a perspective view of the presser foot, feed dog, and throat plate; The figure is a perspective view of the insertion device.
FIG. 5 is a partial sectional view showing the operation of the loading device in its initial state;
Fig. 6 is a partial cross-sectional view showing the late-stage action of the carrying device, Fig. 1 is a plan view of the vicinity of the suture section showing the action of the carrying device, Fig. 8 is a perspective view of the guiding device, and Fig. 9 shows the movement of the fabric. Fig. 10A is a sectional view of the cloth feeding section of this embodiment;
The opening is a cross-sectional view of a conventional cloth feeder, FIG. 11 is a perspective view showing the folded state of the tape, FIG. 12 is a perspective view showing the sewing state of the body and the tape, and FIG. 13 is a perspective view of the undershirt. FIG. 14 is a block diagram of the electric circuit, and FIG. 15 is a time chart.

Claims (1)

[Scope of Claims] 1. A piece of cloth at a fixed reference line arranged in front of the sewing section of the sewing machine in the cloth feeding direction, spaced apart to one side with respect to the cloth feeding line passing through the sewing section, and parallel to the cloth feeding direction. A sensor 15 detects the presence or absence of an edge to be sewn along the feeding direction and generates respective signals, and a sensor 15 is placed in front of the sensor in the fabric feeding direction and responds to the sensor's signal to move forward and backward around an axis parallel to the fabric feeding direction. In a sewing machine that is equipped with a manipulator 14 that has a rotatable rotating body 16 at its free end and presses the rotating body against the upper surface of the bed, and that sews fabrics that have different expansion and contraction ratios depending on the direction of fiber composition, a specific feed amount is determined in conjunction with the main shaft of the sewing machine. A main feed dog 5 that protrudes and retracts above the throat plate so as to perform a feed movement of The sub-feed dog 6 that protrudes and retracts upward, and the operation that is connected to the sub-feed dog 6 so as to be movable along a fixed line in relation to the generation of electrically different action signals, and to increase or decrease the feed amount of the sub-feed dog in relation to the movement position. Means 8. V7, a comparison setting circuit which sets sewing sections in advance in correspondence with the direction of the scheduled stitching edge with respect to the fiber composition direction and generates different instruction signals depending on the sewing sections located between the stitching portion and the manipulator; A control circuit for generating electrically different action signals for controlling an actuating means to set a feed amount on a sub-feed dog that increases or decreases approximately in proportion to the expansion/contraction rate of an edge to be sewn in relation to the occurrence of sewing. Cloth control device.