JPS5910825B2 - Sewing machine cloth control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a sewing machine equipped with a manipulator that moves cloth in a direction crossing the cloth feeding direction in response to a detection signal from a sensor that detects the presence or absence of an edge to be sewn on the cloth. The present invention relates to a fabric control device for a sewing machine that sews together fabric and tape, and particularly relates to a device that reliably moves the edge of the fabric to be sewn to the stitching section.

Conventionally, when controlling a manipulator to pinch and sew the edge of the fabric along the fabric feeding direction in the folded part of the tape bent by the binder using the sewing machine described above, the sewing machine has been configured to sew the tape in the fabric feeding direction. When sewing the fabric and the tape, the fabric is stretched between the sewing part and the manipulator due to the pressing force of the manipulator and is sewn to the tape, so the fabric shrinks after being stitched, resulting in sewing wrinkles. Therefore, an auxiliary feed dog is required for so-called differential feeding, which increases the amount of cloth fed in front of the seam, and there is a step between the folded tape and the cloth, making it difficult to use with a normal presser foot. In this case, the presser foot that presses against the tape will be floating above the cloth, and the sub feed dog and presser foot will not be able to engage with each other. A presser foot was used that had a main presser foot and a slave presser foot that received the pressing force.

However, due to the follower presser and the sub-feed dog that directly engage the fabric, a rotational moment is applied to the fabric in a direction crossing the fabric feeding direction in which the edge to be sewn moves away from the tape bending part, and the sewn edge is moved away from the tape bending part and The edges to be sewn between the sections are fed into the stitching section and stitched while being deviated from the fixed reference line, resulting in unsightly stitches and deterioration of 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 is connected to a motor (not shown) to stitch two chain stitches N (12th stitch) using two needles 2 and one looper (not shown).
This is a well-known decorative stitch sewing machine that forms a decorative stitch sewing machine, and the feed dogs that protrude and retract above the feed groove 4 of the throat plate 3 consist of multiple rows of main feed dogs 5 and one sub-feed dog 6, and these are always Due to the action of the air cylinder 8 below the bed γ, 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 head 1 in the cloth feeding direction are a main cloth holder 9 that is gently curved in the cloth feeding direction, and a sub cloth holder 10 that connects to the curved surface of the main cloth holder 90 and slopes upward in the cloth feeding direction. Undershirts (running shirts) are placed on the sides of the main and sub-cloth rests 9 and 10 and the bed 1.
A carrying tree 12 is arranged to hold the hem of the body W and move 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 1 in the forward direction of the material feed by the action of an air cylinder (not shown). The manipulator 14 (
The gear 16 at the tip is arranged in accordance with the detection signal of the sensor 15 so that the edge of the cloth 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 11 fixedly placed in front of the presser foot 13 in the cloth feeding direction is folded into three folds in a circular motion as shown in FIG. Get pulled out.

The cloth carrying device 18 is used to feed one of the shoulder portions W1 and W2 of the body W held on the carrier 12 to the sewing section before sewing starts, and it is designed to feed one of the shoulder portions W1 and W2 of the body W held on the carrier 12 to the sewing section. Supports the frame 20 rotatably around the center,
The frame body 20 is elastically engaged with an engaging piece 2γ, which will be described later, at a working position facing above the bed surface in front of the sutured portion, and supports the engaging piece 36 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 2γb are superposed vertically and fixed.

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 of the shoulder portion W1 of the body W in the cloth feeding direction, are slightly inclined downward, and are always is separated upward from the upper surface of the bed γ.

When the pin 25 moves along the grooved cam 24 in association with the lowering of the actuating piece 26 by the action of the air cylinder 210, the free end of the main engaging piece 27a moves along the vertical portion 24a of the grooved cam 24. Both free ends of the sub-engaging piece 2γb 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 2γb engages with the shoulder W1 on the inner side thereof, and the horizontal part 24
b, the presser foot 13 is moved in the fabric feeding direction so that one side edge of the shoulder W1 crosses the fabric feeding line passing through the seam and is inserted inside the crease of the tape T folded into three by the binder 11. Direction crossing the cloth feeding direction (first direction) towards the front
Move horizontally in the direction of arrow a in the figure).

Regarding the cloth guiding device 28, the main engaging piece 2 of the cloth carrying device 18
When γa descends onto the bed γ, guide holes 29 are formed that vertically penetrate through the upper surface of the bed l at three outer positions along the leading edge in the cloth feeding direction and one side edge of the free end, and each An actuating plate 31 having three protrusions 30 upright and capable of moving upwardly and retractably 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 γ. 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 so that the coiled spring 33 is bent between it and the bed 1, and the protruding part 30 is made to protrude above the bed γ through the guide hole 29.

Regarding the auxiliary presser device 31 (Fig. 1), a rod-shaped presser body 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. The presser foot 39a is arranged opposite to the throat plate 3 on one side of the presser foot 13 in front of the cloth feed direction, and the other end that stands upward is bent along its own rotational axis direction. A U-shaped fitting portion 39C having a gap is protruded in the horizontal direction from the engaging portion 39b.

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

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;
In connection with the plunger 42 being raised by the action of the air cylinder 41, 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 In response to the component force in the side direction (forward in the cloth feeding direction) due to the inclination, the pressing body 39 resists the elastic force of the coiled spring 40 and moves counterclockwise (in the first (Figure).

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 suppressor 39 from the outer end thereof.
The extension part 13b extends along the cloth feeding direction to the side of a, and supports the base end of the presser foot 13 so as to be movable up and down, and faces the sub-feed dog 6 and always receives downward elastic force. A follower portion 13C extends laterally to the presser 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 2γ 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 installed on each support stand. A fixed guide rod 46 that stands up on one side of the moving path of the tape T that moves is fixed to each support stand 45, and a rotating body 4γ is attached to each support stand 45 so as to be rotatable about a vertical axis. Separately supported, a first guide rod 48a facing the H-rule direction of the linear movement path of the tape and a second guide rod 48b facing the other side are erected and fixed to the rotating body 41 in the same manner as the fixed guide rod 46. However, when the tape T is transported along a straight path, the first and second guide rods 48atb of the rotary body 4γ at the front in the tape T movement direction and the second guide rod 48b of the rotary body 4γ at the front in the movement direction are connected to the tape T. don't touch it.

The plunger 50 of the air cylinder 49, which is fixedly fixed, is connected to an actuating body 51 which is connected to both the support bases 450 and the rotating body 41, and when the plunger 50 is actuated, the first and second guide rods 48a, 48b are connected to each other.
Move the rotating body 4T so that it intersects the movement path of the tape T.
The tape T is rotated by a certain angle, bent into an L-shape between the fixed guide rod 46 and the first and second guide rods 48a and b, and a predetermined tension is applied.

Regarding the tape cutting 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 upper surface of the bed γ, crossing the cloth feeding direction and facing the moving path of the tape T sewn to the body W. A movable sword 55 supported rotatably around an axis 54 along the axis is attached to an electromagnet 5 whose base end is fixed to the machine frame.
6, 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 cooperation of both.

Regarding the blower device (FIG. 1), two pipes 57 and 5B fixed to the frame 20 of the carrying device 18 have their base ends connected to a compressed air source (not shown) and are connected to electromagnetic valves v, yv, which will be described later.

The open end of one of the tubes 51 faces above the lowered position of the engaging piece 2γ and is close to the cloth feed line passing through the seam portion, along the direction crossing the cloth feed direction. The other tube 58 is arranged so as to open downwardly, and the other tube 58 is disposed outwardly from it so as to open downwardly along the cloth feeding direction.

The cloth sensors 5L, 60at, and 60b receive light from a light source (not shown), detect the presence or absence of cloth on the bed γ, and generate cloth detection signals for each state.

The cloth sensor 59 is arranged on the side of the manipulator 14 in front of the guide hole 29 of the bed 10 in the cloth feeding direction, and is for detecting when the waste portion W1 of the body W is placed along the protrusion 30 at the beginning of sewing. , sensors 60a, 60b
Is it on the side of presser foot 13? They are arranged spaced apart from each other in the cloth feeding direction, and are used to set the operating timing of the electromagnet 56 of the tape cassoter device 52.
are selectively enabled.

That is, the sensor 60a at the rear in the cloth feed direction 9 is used when cutting the tape T with a predetermined length protruding from the front edge of the cloth of the body part (2), and the center 60b at the front in the cloth feed direction is used when cutting from the rear edge of the cloth of the body part W. Used when cutting tape T with a certain length protruding.

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

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

In the figure, ■1 to v1 are the magnetic valves of each air cylinder, ■, is the electromagnetic box of the air cylinder 21 of the cloth carrying device 18, v2 is the illuminated valve of the air cylinder 34 of the cloth guide device 28, and v3 4 is a solenoid valve of an air cylinder (not shown) for raising and lowering the presser bar; 4 is a solenoid valve of an air cylinder (not shown) for pressing the manipulator 14 onto the top surface of the bed 1; The frost magnetic field of the air cylinder 11, v6 is the air cylinder 8 for differential feeding.
v7 is the electromagnetic valve of the air cylinder 49 of the tape tension device 44, v8 is the electromagnetic valve of the air cylinder 41 of the auxiliary presser device 31, and v9 is the electromagnetic valve of the air cylinder 41 of the auxiliary presser device 31.
1, a solenoid valve that opens and closes the air flow generated in the pipe 58, v1,
It is an electromagnetic cell that opens and closes the air chambers generated in the air.

These solenoid valves v1 to v1 are individually activated or deactivated under the control of the respective electromagnetic cell control circuits C1 to CIQ.

In particular, the air cylinder 110 control circuit C5 of the cloth carrier 12 controls the electromagnetic box v5 so that the carrier 12 moves at approximately the same speed as the moving speed of the body part W driven by the sewing machine 1.

Z is a buzzer that generates an alarm, and the buzzer control circuit C1
The sound is generated intermittently for a time C set by the operator under the control of the operator.

The electromagnet 56 of the tape cutter device 52 is an electromagnet control circuit C1.

It is energized for a certain period of time and then de-energized by the control.

M is a motor connected to the main shaft of the sewing machine (not shown), which is driven or stopped by a motor control circuit C130, and when it is driven, a drive current is supplied from either the low-speed drive circuit D1 or the high-speed drive circuit D2. Driven by.

The low speed drive circuit D1 drives the motor M at a constant low speed,
The high speed 1 drive circuit D2 drives at either medium speed or high speed specified by the speed setting circuit K.

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 count setting circuits that respectively set the number of stitches to sew the straight section X and the curved section y of the shoulder and collar of the undershirt shown in Fig. 13. Can be set to a number.

E1 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 E1 has a count value that matches the number of stitches set by the number of stitches setting circuit X. When E2 generates a match signal from E1, it starts counting the position signal a↑, and when the count value set by setting circuit Y matches the count value, it generates a match signal.

F is a switching circuit, which is a control circuit C6 for electromagnetic cells 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 1 drive circuit D2 are activated when a stitch is formed in a predetermined one of the sewing sections X or y.

S is a selection switch that selects whether to enable or disable electromagnetic valves V6 and V7 that operate the differential feed and tape tension devices.

T1 to TIQ are respective set times △L1 to △t
It is a timer circuit with lQ, especially T, tT6
y Tg allows the setting time to be adjusted externally, and
At T3, the timer is set for one hour until the shoulder W1, which is held between the bed γ and the engagement piece 2γ of the carrying device 18, is fed by the feed dogs 5 and 6 and the first needle drops. T4 is configured so that its own set time expires after T3's set time 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 air cylinder (not shown) that raises and lowers the presser bar and the air cylinder 340 of the cloth guide device 28 and the solenoid valves V2 and 3 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 bend 1.

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

When the tip of the waste portion W1 of the undershirt W is placed along the protrusion 30 as shown in Fig. γ, the cloth is placed on the sensor 59, so a cloth detection signal is generated from the sensor 59, and the buzzer Z is activated by the timer circuit. During the set time ΔL1 of T, a sound is generated intermittently and the electromagnetic cell v9 is opened so that an air flow is generated in the tube 5γ.

The wrinkles of the shoulder W1 along the protrusion 30 are smoothed out by the air flow from the pipe 5γ, and the shoulder W1 is brought into close contact with the upper surface of the bed I, and ΔL1
After the elapsed time, the buzzer Z stops sounding and the electromagnetic yFv9 closes, and the electromagnetic cell v of the air cylinder 21 of the carry-in device 18 closes.
1 and close the electromagnetic cell v2 of the air cylinder 34 of the cloth guide device 28.

The protruding portion 30 descends below the bed γ, and the pin 25 is guided by the vertical portion 24a of the grooved cam 24 and engages the main and sub-engaging pieces 27a, 2.
7b descends and presses the shoulder W1 between it and the top surface of the bed 1, and the pin 25 is guided by the horizontal part 24b, and the main and sub-engaging pieces 27a and 2γb move in the direction of the arrow in Fig. One end of the waste portion 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 placed corresponding to the leading end of the presser foot 13 (FIG. 1 W1).

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

After the timer T2 has elapsed, the motor M is driven at the low speed set by the low speed drive circuit D1 by the output of the motor restriction circuit q3. (Set the circuit to sew as shown in Fig. 13, and at the same time open the electromagnetic cell v1o of the pipe 58 to generate an air flow in the forward direction of the cloth feeding direction, thereby transporting the body W on the bed T forward in the cloth feeding direction. It also sets the timer circuits T and jT5.

The sewing machine 1 is driven at low speed for ΔL4 after starting, 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 simultaneously ( To be precise, when the needle descends to the lower position), the set time ΔL3 of the timer circuit T3 ends, the electromagnetic square 1 of the air cylinder 21 closes, the engagement piece 2γ of the carrying 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 brought into operation, the circuit D2
supplies current to the motor M to drive the motor M at a high speed specified by the speed setting circuit K, and then the leading edge of the body W reaches the sensor 60a to generate a detection signal and set the timer circuit T6. do.

Immediately after that, the set time Δt5 of the timer circuit T5 ends and the electromagnetic box 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 timer circuit T6 reaches the set time t6 ends, the electromagnet 5
6 is energized, the moving blade 55 of the tape force vine device 52 rotates and cuts the tape T protruding from the front end 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 the direction crossing 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 into the seam part. In addition, 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 count setting circuit X, which is preset to the number of stitches required to sew the straight line section When a match signal is generated from the comparison circuit E1, the comparison circuit E2
At the same time, the switching circuit F is switched to the circuit state for sewing the curved section y, and its output causes the motor M to be activated.
The driving speed controls the setting circuit K.

In addition, the output controls the control circuits 06 to C, to each electromagnetic cell v6.
~V, is controlled to open.

It is difficult to stitch this curve section y.

In other words, 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 of the sensor 15 is moved as shown in FIG. The fabric side edge on the front side in the feeding direction moves outward with respect to the fabric feeding line passing through the seam portion (double-dashed line).

Therefore, the body W fed into the stitching portion is deviated from the folds of the tape T and is 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 ■9 of the pipe 5γ is opened to direct the air flow in the direction of the arrow g (
(Fig. 9) onto the body W on the bed γ, and the electromagnetic box v8 is opened to rotate the pressing body 39 of the auxiliary presser device 3γ, and the presser portion 39a feeds the cloth against the presser foot 13. By pressing the body W against the bed 1 surface in the front direction and on the side, the body W is moved in the counterclockwise g1 direction (
9) is applied to the body W, and due to this air flow and rotation moment, the body W between the sensor 15 and the seam receives a force acting in the direction of the cloth feed line, and the edge of the body W is applied with the tape. Line it up inside the bent part of the 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 there is no extension 13b of the presser foot 13 (as shown in Figure 10), the gathered body W is connected to the tape T and the subordinate portion 13 of the presser foot 13
However, when the extension part 13b is provided as in this embodiment, the extension part 13b presses down the body W, so large wrinkles are not created. It is well known that a stretchable knitted fabric is used in the fabric and the knitted fabric is sewn so as to stretch in the horizontal direction. If the same presser foot pressure is applied when sewing the curve section y, the fabric will be sewn together with the tape T while being stretched, so the net feed amount between the body and the tape will be different, and the body W will shrink after being sewn. Sewing causes wrinkles.

Therefore, as in this embodiment, by opening the solenoid valve 6 of the air cylinder 8, the feed amount of the auxiliary feed dog 6, which transfers the body part W while sandwiching it between the slave part 13C of the presser foot, is set relative to the main feed dog 5. If differential feeding is performed to increase the amount of movement, the degree of elongation of the body W is decreased and the body is fed.

In addition, the electromagnetic cell v7 of the air cylinder 49 is opened to act on the air cylinder 49, and the rotating body 41 of the tape tension device 44 is
When the first and second guide rods 48a and 48b intersect the seven paths of movement of the tape T and bend the tape into a "<" shape, tension is applied to the tape T and the suturing is performed. The tape between the two parts is stretched and transferred to the suture part.

Due to the synergistic effect of reducing the elongation of the body W due to differential feeding and elongating the tape due to tape tension, the amount of elongation of the body W and tape T during sewing is equalized, and no sewing wrinkles occur on the body W after sewing. .

After switching the switching circuit F, the comparator circuit E2 calculates the needle position signal from the needle position detection means by B, and when the a value corresponds to the set number of stitches of the stitch number setting circuit Y, that is, the curve section y. When the boundary between and the next straight section
(2) is closed, and the speed setting circuit K is controlled to drive the motor M again at a high speed, with the differential, tape tension, and feed blower inactive.

(However, the comparison circuit E1 is not enabled.

) When the trailing 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 ΔL7. After the motor M is driven at a predetermined low speed 1 by the drive circuit D1, the rear edge of the body W is moved to the manipulator 14.
Further, when the sensor 15 detects the rear edge of the cloth of the body W, the detection signal causes the timer circuit T8 to be activated, and during the set time Δt80, the timer circuit T7 reaches the set time L7 and starts high-speed driving. Circuit D2 should again drive motor M at high speed.

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, L7 ends at the time set by the timer circuit T7 after the body W returns to a steady state, and the sewing machine is then driven at high speed 1.

Immediately after the motor M is driven at high speed 1, L8 ends at the time set by the timer circuit T8, and the electromagnetic circuit 9fv closes to separate the manipulator 14 upward from the upper surface of the bend I.

The sensor 60b detects the rear end of the body part W, and based on the detection signal, the timer circuit T is activated, and the set time △L
9, the electromagnetic box V 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 rear end of the body W. At the same time as cutting the continuous tape T, the electromagnetic-9fV2 is opened and the air cylinder 34 of the cloth guide device 28 is opened.
is applied to rotate the actuating plate 31 so that the protruding portion 30 protrudes from the guide hole 29 of the bed γ, and at this time, the actuating plate 31 is actuated on the motor control circuit C13 to stop the motor M and the sewing machine 1
Stop 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, and the solenoid -9+V of the pipe 58
] , to cut off the airflow, and then close the auxiliary presser device 3.
When the solenoid valve V8 of the air cylinder 41 of No. 1 closes, the pressing body 3
9 returns and sets the timer circuit TIQ.

Since the pressing body 39 acts until the end of this sewing, the 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 W is located outward from the line, an outward rotational moment is applied to the body W, and after the rear end edge of the body W comes out of the manipulator 14 until it is sent to the suture section, the body W rotates to the left in FIG. (Left side in Figure 1), the tape T comes off from inside the bent part, but the pressing part 39a of the pressing body 39 engages with the body, and as mentioned above, the tape T comes off in the opposite direction to the feed dog 6. It acts to apply a rotational moment and keep the edge of the body W always located within the folded part of the tape T.

Thereafter, when the set time ΔtlQ of the timer circuit TIQ ends, the electromagnetic square 3 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, in front of the sewing part in the cloth feeding direction, the feed dog is arranged on the side in the cloth feeding direction opposite to the fixed reference line, and the edge to be sewn moves outward from the reference line. A fabric that can be expanded and contracted in the fabric feeding direction by providing an auxiliary presser foot 39 that pinches the outer part of the tape and presses against the top surface of the bed so as to apply an acting force to the fabric in a direction crossing the fabric feeding direction. When sewing the fabric by pinching the edge to be sewn inside the folded tape, the sub-feed dog and follower foot that perform differential feeding will move the edge of the fabric to be sewn away from the tape fold (standard). Even if a rotational moment is applied in the direction crossing the direction in which the fabric is fed away (inward from the line), the auxiliary presser foot applies an acting force to the fabric in the direction opposite to the rotational moment, so the stitching area and Since the edge to be sewn between the sensor and the sensor can be positioned on the fixed reference line, the edge to be sewn does not always come off the tape bending part, which has the effect of aligning the seams and significantly improving the quality of the product. It will be done.

[Brief explanation of the drawing]

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 loading device.
FIG. 5 is a partial sectional view showing the operation of the loading device in its initial state;
Fig. 6 is a partial sectional view showing the latter stage of the operation of the carrying device, Fig. Fig. 10A is a sectional view of the cloth feeding section of this embodiment;
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; FIG. 13 is a perspective view of the undershirt; FIG. 14 is a block diagram of the drowsiness circuit, and FIG. 15 is a time chart.

Claims (1)

[Scope of Claims] 1. A binder 11 which is fixedly disposed in front of the sewing machine sewing part in the cloth feeding direction and has one side open in the direction crossing the cloth feeding direction so that a flexible tape can be folded along the cloth feeding direction; Sewing is planned along the fabric feeding direction of the fabric on a fixed reference line that is spaced apart in front of the fabric feeding line and passed through the stitching part. A sensor 15 that detects the presence or absence of edges and generates respective signals, and a rotating body that is placed in front of the sensor in the cloth feeding direction and can rotate forward and backward about an axis parallel to the cloth feeding direction in response to the sensor signal. 16 at the free end and a manipulator 14 that presses a rotary body against the top surface of the bed, and a fabric that can be expanded and contracted in the fabric feeding direction and the tape are folded, and the edge to be sewn of the fabric is sandwiched inside the tape. In a sewing machine that performs sewing, a plurality of rows of teeth are provided to sandwich the fabric feed line passing through the sewing section, and a main feed dog 5 that retracts above the throat plate so as to perform a feeding movement in conjunction with the main shaft of the sewing machine, and a main feed dog 5 that pinches the sewing section. In front of the main feed dog in the cloth feeding direction on the opposite side of the reference line, there is a single row of sub feed dog 6 that is interlocked with the main shaft and protrudes from and retracts from the throat plate so as to perform a larger feed movement than the main feed dog, and a vertical movement on the machine frame. a main part 13a fixed to the lower end of the presser bar and arranged oppositely above the main feed dog with the outer part of the tape sandwiching the edge to be sewn of the fabric; A cloth presser foot 13 is supported on the main part so as to be movable up and down, and has a slave presser foot 13b which is always subjected to a downward elastic force and is placed oppositely above the sub-feed dog, sandwiching the outer part of the tape of the cloth; On the other hand, it is placed on the side of the sub-feed dog opposite to the reference line in the fabric feed direction before the fabric feed direction, and applies a force to the fabric in a direction crossing the fabric feed direction so that the edge to be sewn moves outward from the reference line. A fabric control device for a sewing machine, which is equipped with an auxiliary presser foot 39 that pinches the outside of the fabric tape and presses it against the top surface of the bed.