JPS5910826B2 - Sewing machine control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a mechanism for transporting the fabric of a workpiece between tapes folded by a binder fixedly placed on one side of the fabric feed line passing through the stitching area in front of the sewing machine stitching area in the fabric feeding direction. In a sewing machine that sews a tape to a material to be sewn by pinching one side edge along the direction, the one side edge of the fabric is placed within the folded part of the tape at the beginning of sewing, and the leading edge is placed on the seam part. The present invention relates to a control device for a sewing machine having a carry-in means that moves, and particularly to a device for controlling the operation of the carry-in means.

Conventionally, a sewing machine having the above-mentioned carrying means was disclosed in Japanese Patent Application No. 155724-1983 (Japanese Patent Application No. 17553-1983).
According to this, the carrying means moved the cloth to the sewing position and then returned to the preparation position before driving the sewing machine, but the tape and cloth were not yet sewn. Before the engaging piece moves horizontally on the bed and returns to its original position, the fabric is pulled toward the preparation position, causing one edge of the fabric to come off the tape bend and be sewn, making the product unsightly or causing the edges to become unsightly. This has resulted in drawbacks such as the edges coming off from the stitched portion, making it impossible to stitch, and creating stitches only in the tape, wasting the tape.

The present invention aims to eliminate the above-mentioned conventional drawbacks.

An embodiment of the present invention will be described with reference to the drawings. A sewing machine 1 operates in conjunction with a motor (not shown) to stitch two chain stitches N (12
This is a well-known decorative stitch sewing machine that forms a decorative stitch sewing machine, and the feed teeth that protrude and retract above the feed groove 4 of the throat plate 3 consist of multiple rows of main feed teeth 5 and one row of sub feed teeth 6, and these are always have the same amount of feed, and are connected so that the amount of feed of the sub feed dog 6 is greater than that of the main feed tooth 5 due to the action of the air cylinder 8 below the bed 7, making so-called differential feed possible.

In front of the bed 7 in the cloth feeding direction, there is a main cloth holder 9 that is gently curved in the cloth feeding direction and a sub cloth holder that is connected to the curved surface of the main cloth holder 9 and slopes upward in the cloth feeding direction. A stand 10 is arranged, and undershirts (running shirts) are placed on the sides of the main and sub-cloth holders 9 and 10 and the bed 7.
A carrier 12 is placed which grips the hem of the body W and moves forward in the cloth feeding direction by the action of an air cylinder 11.

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.

The cloth carrying device 18 is for feeding one of the shoulder portions W1 and W2 of the body W held by the carrier 12 to the sewing section before sewing starts, and is a device for feeding the cloth carrying device 18 to the sewing section 1, which is fixed to the surface of the sewing machine 1.
9 supports a frame 20 rotatably about a vertical axis, and this frame 20 is elastically engaged 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. A locking piece 36 that can be locked 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 stacked 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 top surface of the bed 7.

When the pin 25 moves along the grooved cam 24 in association with the lowering of the operating piece 26 by the action of the air cylinder 21, the free end of the main engaging piece 27a moves along the vertical portion 24a of the grooved cam 24, and the free end of the main engaging piece 27a touches the edge of the shoulder W1. and the free end of the sub-engaging piece 27b engages with the shoulder W1 on the inside of the sub-engaging piece 27b.
, the presser foot 13 is moved in front of the presser foot 13 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 17. It moves horizontally in a direction crossing the cloth feeding direction (in the 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 7 at three outer positions along the leading edge in the cloth feeding direction and one side edge of the free end. An actuating plate 31, which has 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 7. 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 curling spring 33 between it and the bed 7, while causing the protrusion 30 to protrude above the bed 7 through the guide hole 29.

Regarding the auxiliary presser device 37 (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 member 39a. This presser foot part 39a is arranged facing 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 upward is bent along the direction of its own rotational axis. A U-shaped fitting portion 39c with a gap is protruded from the engaging portion 39b in the horizontal direction.

An elastic force is normally applied in the rotating direction (clockwise in FIG. 1) so that the presser part 39a comes into pressure contact with the upper surface of the throat plate 3 by a winding spring 40 whose one end of the suppressor 39 is fixed to the machine frame. is recieving.

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;
When the plunger 42 rises due to the action of the air cylinder 410, when the inclined guide part 43a engages with the lower end of the engaging part 39b of the pressing body 39 due to the rising of the connecting rod 43, due to the inclination of the engaging part 39b path. Counterclockwise (FIG. 1) so that the presser part 39b moves upward away from the throat plate 3 against the elastic force of the coiled spring 40 of the presser body 39 in response to a component force in the side direction (forward in the cloth feeding direction). 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 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 27 of the loading device 18 and to prevent the tape T from turning over (FIGS. 5 and 6).

Regarding the tape tensioning device 44 (FIG. 2), a pair of support stands 45 are fixed to the front side of the sewing machine 10, 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 rotating bodies 47 are individually supported so as to be rotatable around the center.
A second 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 rotating body 47, and the tape T When the tape T is transferred along a straight path, the first and second guide rods 48a of the rotary body 47 in the forward direction of the tape T movement direction are moved.
, b and the second guide rod 48b of the rotating body 47 in the forward direction of movement do 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 rotary bodies 47 of both support stands 45, and when activated, the first and second guide rods 48a, 48b
The rotating body 47 is rotated at a certain angle so that the tape T intersects with the moving path of the tape T, and the tape T is bent into an L-shape between the fixed guide rod 46 and the first and second guide rods 48a and 48b. 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 disposed on the upper surface of the bed 7, crossing 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 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 the blade 55a is rotated by the action of the electromagnet 560, 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 58 fixed to the frame 20 of the carrying device 18 have their base ends connected to a compressed air source (not shown) via electromagnetic valves v9 and v1o, which will be described later. The opening end of one of the tubes 57 is in communication with the engaging piece 27.
The lowered position of the tube 58 is opposite to the upper part and is arranged so as to open downward along the direction intersecting the cloth feeding direction near the cloth feeding line passing through the seam part. The holes are arranged so as to open downward along the feeding direction.

Cloth sensors 59, 60a, 60b are light sources (not shown)
The presence or absence of cloth on the bed γ 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 W1 of the body W is placed along the protrusion 30 at the beginning of sewing. Yes, sensor 60a, 6
0b The electromagnet 56 of the tape cutter device 52 is arranged on the side of the presser foot 13 and spaced apart from each other in the cloth feeding direction.
This is to set the activation timing of the two, and only one of them is selectively enabled at any given time.

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 always stopped in accordance with the needle down position.

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

In the figure, ■1 to v1o are the solenoid valves of each air cylinder, V1 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 for lifting and lowering the presser bar. The solenoid valve V4 of the air cylinder (not shown) is used to move the manipulator 14 to the bed 7.
A solenoid valve of an air cylinder (not shown) for pressing against the upper surface, V″5 is an air cylinder 1 that operates the cloth carrier 12.
1 is a solenoid valve V6 of the air cylinder 8 for differential feeding, V7 is a solenoid valve of the air cylinder 49 of the tape tension device 44, V8 is a solenoid valve of the air cylinder 41 of the auxiliary presser device 37, Further, v9 is a solenoid valve that opens and closes the air flow generated in the pipe 57 of the blower device, and V1o is a solenoid valve that opens and closes the air flow generated in the pipe 57 of the blower device.
This is a solenoid valve that opens and closes the air flow generated at 8.

These solenoid valves v1 to V1o are individually activated or deactivated under the control of the respective solenoid valve control circuits C1 to CIO.

In particular, the control circuit C5 of the air cylinder 11 of the cloth carrier 12 controls the electromagnetic valve 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.

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

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 C12.

M is a motor connected to the sewing machine main shaft (not shown), which is driven or stopped under the control of a 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 1 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 designated by the speed setting circuit K.

The speed setting circuit is set with one driving speed in sewing sections X and y, which will be described later, and the speed is set such that x>y.

X and Y are stitch number setting circuits that respectively set the number of stitches for sewing 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.

E, , E2 is a comparator circuit that counts the position signal from the needle position detection means P (pulse transmission per rotation of the sewing machine main shaft), and the counted value matches the number of stitches set by the E1 and stitch number setting circuit X. When the count value matches the number of stitches set by the setting circuit Y, a match signal is generated.

F is a switching circuit, which is a control circuit C6 for solenoid valves v6 to V9.
.about.C and the high-speed 1 drive circuit D2 are selectively set to operate in one of the sewing sections X and y so that they are activated when a stitch is formed in a predetermined one of the sewing sections X and 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.

Separate setting times △t1 to △tt for T1 to T1o
In particular, T1, T6, and T9 are timer circuits that can be adjusted from the outside for setting times, and T3 is a timer circuit that has a shoulder W1 held between it and the bed 7 by an engaging piece 27 of the carrying device 18. , set the timer for one hour until the first stitch is sent by the feed dogs 5 and 6, and then press 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, 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 V3 are open, the presser foot 13 is separated above the throat plate 3, and the operating plate Is the protrusion 30 of 31 the guide hole of the bed 7? It protrudes upwards from 9.

Select the selection switch S to the "enabled" 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 v9 is opened so that a sound is generated intermittently and an air flow is generated in the pipe 57 for a set time Δt1 of T1.

The shoulder portion W1 along the protruding portion 30 is smoothed out by the air flow from the pipe 57 and comes into close contact with the top surface of the bed 7, and Δt1
After the elapsed time, the buzzer Z stops sounding and the solenoid valve v9 closes, and the solenoid valve V1 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 portion 30 descends below the bed 7, 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 the body of the bed 7, and the pin 25 is guided by the horizontal portion 24b, and the main and sub-engaging pieces 27a and 27b move in the direction of the arrow in FIG. Insert one end of the shoulder W1 between the top surface of the bed and the cloth feeding direction into the fold of the tape T, and place the tip edge corresponding to the tip of the presser foot 13 (FIG. 7W, )
.

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 holds the body part W and presses it against the surface of the bed 7 with appropriate force, and sets timers T2 and T3.

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 undershirt straight section X (13th The circuit is set to sew the body part W on the bed γ, and the solenoid valve V1o of the pipe 58 is simultaneously opened to generate an air flow in the forward direction in the cloth feeding direction.
It acts to move the material forward in the cloth feeding direction, and also sets timer circuits T4 and T5.

After the sewing machine 1 is started, it is driven at low speed for a period of Δt4, during which time the body part W and the 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 more precise, when the hand descends to the lower position), the time t3 reaches the set time of the timer circuit T3, 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
A current is supplied to the motor M so as 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 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 Δt 6hdz of the timer circuit T6 has expired, the electromagnet 56 is energized, and the movable blade 55 of the tape force vine device 52 is activated.
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. In addition, the comparison circuit E1 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 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.

Also, depending on the output, the control circuits C6 to C are controlled by each solenoid valve V6.
~ Control so that V9 opens.

It is difficult to stitch this curved section y, so the gear 16 of the manipulator 14 has to control the fabric so that the edge of the fabric is always positioned above the sensor 15. When the value is large, the sensor 15 as shown in FIG.
The front edge of the fabric in the fabric feeding direction is deviated 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 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 made easier to control the fabric by the low stitch manifolder 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 7, the solenoid valve v8 is opened, the presser body 39 of the auxiliary presser device 37 rotates, and the presser foot 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 there is no extension part 13b of the presser foot 13 (as shown in Figure 10), the gathered body W is connected to the tape T and the follower part 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 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 different. After that, the body W shrinks, resulting in wrinkles.

Therefore, as in this embodiment, by opening the solenoid valve V6 of the air cylinder 8, the feed amount of the sub-feed dog 6, which transfers the body W while sandwiching it between the subordinate part 13c of the presser foot, is set relative to the main feed dog 5. When the differential feeding is performed to increase the number of legs, the degree of elongation of the body W is reduced and the body is fed.

Also, the solenoid valve v7 of the air cylinder 49 is opened to operate the air cylinder 49, and the rotating body 4γ 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 tenip is transferred to the suture site while being stretched.

Due to the synergistic effect of the reduction in elongation of the body W due to differential feeding and the elongation of the tape due to tape tension, the amount of elongation of the body W and tape T during stitching is equalized, and no sewing wrinkles occur 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 in 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 and the switching circuit F is switched to the circuit state for sewing the straight section , controls the speed setting circuit K to drive the motor M again at a high speed.

(However, 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 for the set time Δt, f7), the high speed 1 drive circuit D2 becomes inactive and the low speed 1 drive After the motor M is driven at a predetermined low speed by the circuit D1, the trailing edge of the body W passes through the manipulator 14, and when the sensor 15 detects the trailing edge of the cloth of the body W, the detection signal is sent to the timer circuit T8.
is set, and during the set time Δt8, the timer circuit T
After the set time Δt7 of 7 has ended, the high-speed drive circuit D2 again drives the motor M at high speed 1.

While the body part W is being pressed by the manipulator 14, it is stretched and fed between the body part W and the seam part due to the pressing force.When the rear end of the body part W passes through the manipulator 14 and the pressing force is released, is contracted and then returns to a steady state.

In this embodiment, the set time Δt7 of the timer circuit T7 ends 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, 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 bed 7.

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
, is completed, the solenoid valve v5 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 connect the rear end of the body W. At the same time as cutting the tape T, the solenoid valve v2 is opened and the air cylinder 34 of the cloth guide device 28 is activated to rotate the operating plate 31 so that the protrusion 30 protrudes from the guide hole 29 of the bed 7. At this time, the motor control circuit C1g is actuated 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 v1o of the pipe 58 to cut off the air flow, and further closes the solenoid valve V1 of the air cylinder 41 of the auxiliary holding device 37. When the valve v8 closes, the pressing body 39 returns to its original position and sets the timer circuit T1o.

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 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 7), the tape T comes off from inside the folded part, but the presser part 39a of the suppressor 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 so that the edge of the body W is always located within the folded portion of the tape T.

After that, the set time ΔtlO of the timer circuit T1o ends, and 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, the carrying means 18 is returned after the first needle drop is made on the leading edge of the cloth caught by the tape at the beginning of sewing, so that the first needle drop makes it possible to connect the tape with the tape. Since the cloth is held down by the carrying means until it is fed together with the cloth, the cloth does not come off the folded part of the tape, so products with clean seams can be obtained, and the tape There is no need to waste tape, and effects such as reduced tape consumption can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the sewing machine of this embodiment seen from the rear side, Fig. 2 is a perspective view of the sewing machine seen from the front side, Fig. 3 is a perspective view of the presser foot, feed teeth, and throat plate; Figure 4 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 cross-sectional view showing the late-stage action of the carrying device, Fig. 7 is a plan view of the vicinity of the sutured portion showing the action of the carrying device, Fig. 8 is a perspective view of the guide device, and Fig. 9 shows the movement of the cloth. 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 needle that moves up and down in conjunction with the main shaft of the sewing machine, feed dogs 5 and 6 that perform feeding motion in conjunction with the main shaft of the sewing machine, and are arranged before and after the needle drop point in the fabric feed direction, and a feed dog at the lower end. A sewing section consisting of a presser foot 13 facing upward, supported movably up and down on the machine frame, and always receiving an elastic force downward, and a needle drop point in front of the sewing section in the cloth feeding direction. a binder 17 that is fixedly arranged on one side of the fabric feed line passing through the fabric feed line and folds the flexible tape so as to be open along the fabric feed line and toward the fabric feed line; The leading edge of the cloth in the cloth feeding direction is located above the front end of the feed dog in the cloth feeding direction, and the one edge along the cloth feeding direction is sandwiched by the folded part of the tape folded by the binder. a carrying-in means 18 which is horizontally movable by sandwiching the cloth between the working position and the bed surface; and a first detection stage 59 which generates a detection signal in relation to the presence of the cloth in the preparation position of the carrying-in means. , a second detection stage 15 which generates a detection signal in connection with the presence of the cloth in the active position of the conveying means, coupled in such a way that upon action it moves the conveying means from the ready position to the active position and upon deactivation it returns. the first actuating means; the second actuating means connected to each other so as to raise and hold the presser bar against elastic force; switching between a first state in which the sewing machine is stopped and a second state in which the sewing machine is driven; Drive circuits C13, D1, D2 that made it possible
and the first actuating means is always actuated and the drive circuit is in the first state, and the first actuating means is actuated in relation to the generation of the detection signal of the first detection means, and the first actuation means is actuated in connection with the generation of the detection signal of the second detection means. so that the second actuating means is inoperative and the drive circuit is in the second state, and the first actuating means is inactivated after the needle drop is made at the tip of the cloth whose one edge is held between the tapes. A control device for a sewing machine with associated control circuits T4, C1, C3.