JPS5910824B2 - 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. This invention relates to a fabric control device for a sewing machine that sews together a tape and a fabric whose shape follows an inward arcuate curve, and in particular relates to a device that reliably moves the edge to be sewn along the curved line to the stitching portion. When controlling the manipulator to pinch and sew the edge of the fabric along the cloth feeding direction in the folded part of the tape bent by the binder using the sewing machine, the sensor controlling the manipulator will sew the tape with the manipulator in the cloth feeding direction. In the manipulator rake shift between the sewing section and the sewing section, the edge to be sewn will curve inward because it is placed on a reference line that is spaced to one side from the fabric feeding line that passes through the sewing section and parallel to the fabric feeding direction. The following drawbacks occurred when sewing the tape to the fabric along the line.

That is, the manipulator controls the cloth so that the edge to be sewn is always located above the sensor, but when the edge to be sewn is an arc, the edge to be sewn between the sewn part and the sensor is positioned above the sensor as shown in FIG. The tape entered the inside of the reference line (dotted chain line) (on the side of the suture area), and the tape was fed into the suture area and sutured while the edge to be sutured was removed from the bent part of the tape, making the stitches unsightly and causing the tape to bend again. There is a step between the tape and the cloth, and with a normal presser foot, the presser foot that presses against the tape is 9 degrees above the cloth.
It becomes floating and the feed dog and presser foot cannot be held together.
Since normal cloth feeding is not achieved, a follower presser is used that holds the outer part of the cloth tape, faces above the feed dog, is supported movably up and down on the main part of the presser foot, and receives a downward elastic force on its own. However, since this follower presser is located inward from the fabric feed line that passes through the needle drop point, the pressing force applied to the fabric from the follower foot causes the edge to be sewn to move away from the tape bend. A moment of rotation is generated in the outward direction of the curve, and as described above, the edge to be sewn is sent to the seam part once removed from the tape bending part and is sewn, making the seam unsightly and significantly reducing the quality of the product. caused a drawback.

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 moke (not shown) and uses two needles 2 and a looper (not shown) to stitch two chain stitches N (12th
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 The auxiliary feed dog 6 is connected so that the feed amount is greater than that of the main feed dog 5 by the action of an air cylinder 80 below the bed 7, which has the same feed amount, thereby making so-called differential feed possible.

In front of the bed 7 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 holders 9 and 10 and 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). Saleru 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 transports one of the shoulder parts W1 and W2 of the body W held on the carrier 12 to the sewing part 9 before starting sewing.
Holder 1 fixed to the 10th surface of the sewing machine.
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 locking piece 36 is supported on the machine frame.

The upper end of the air cylinder 21 is rotatably supported on the frame 20 by a horizontal shaft 22, and the lower end of the pusher 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 in the cloth feeding direction of the shoulder portion W1 of the body W, and are slightly inclined downward. 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 γ, guide holes 29 are formed that vertically penetrate through the top 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 coiled 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 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. The presser foot 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 rising upward is bent along its own rotation axis direction 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 locked to the machine frame. .

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 lateral direction (forward in the cloth feeding direction), the presser part 39b is moved counterclockwise (see FIG. 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. An extension part 13C that rests on the extension part 13b and extends laterally to the presser part 39a.
It is composed of

The needle plate 3 corresponds to the main feed dog 5, and the front side in the cloth feeding direction from the needle drop point 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 each support stand 45 is provided with three tape guide rods to be described later.

In both of the support stands 45, a fixed guide rod 46 that stands up on one side of the movement 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. A rotary body 47 is separately supported rotatably around the center, and a first guide rod 48a, which is fixed to the rotary body 47 and faces the same as the guide rod 46 on one side of the linear movement path of the tape, and a first guide rod 48a facing on the other side of the linear movement path of the tape. When the tape T is transferred along a straight path, the first and second guide rods 48a, b of the rotary body 47 in front of the tape T moving direction are fixed in an upright position.
The second guide rod 48b of the rotating body 47 on the forward side in the moving direction 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 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, and the blade portion 55a at the tip faces above the fixed blade 53, and when it rotates due to the action of the electromagnet 560, the tape T moving on the fixed blade 53 can be cut by cooperation of both.

Regarding the Proer device (Fig. 1), two tubes 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) via solenoid valves v, , V1o, which will be described later. The open end of one of the tubes 57 is connected to the engaging piece 27.
The lowered position of the pipe 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, and the other tube 58 is arranged to face the cloth feeding line outward from the cloth feeding line. The holes are arranged so that they open downward along the direction.

The cloth sensors 59, 60a, and 60b detect the presence or absence of cloth on the bed 7 by receiving light from a light source (not shown), 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 70 in the cloth feeding direction, and is for detecting that the shoulder W1 of the body W is arranged along the protrusion 30 at the beginning of sewing. , sensor 60a, 60
b are placed on the sides of the presser foot 13, spaced apart from each other in the cloth feeding direction, and are used to set the activation timing of the electromagnet 56 of the tape cutter device 52, and only one of them is always selectively activated. Enabled.

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 VIO 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 of the air cylinder 34 of the cloth guide device 28. V4 is a solenoid valve of an air cylinder (not shown) for pressing the manipula rake 14 against the upper surface of the bed 7; v is an air cylinder that operates the cloth carrier 12; 11 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, V is the solenoid valve of the air cylinder 41 of the auxiliary holding device 37,
7 is a solenoid valve that opens and closes the air flow generated, v1o is a pipe 58
This is a solenoid valve that opens and closes the air flow generated in the air.

These solenoid valves v1 to V1o are individually activated or deactivated under the control of the respective solenoid valve control circuits C1 to C1o.

In particular, the air cylinder 110 control circuit C of the cloth 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 part W driven by the sewing machine.

2 is a buzzer that generates an alarm, and the buzzer control circuit C1
1, the sound is generated intermittently for a period of 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 moke connected to the main shaft of the sewing machine (not shown), which drives or stops Eri 1 under the control of the motor control circuit C13, and when it is driven, is driven by the drive current from either the low-speed drive circuit D1 or the high-speed drive circuit D2. Driven.

The low-speed drive circuit D1 drives the mork M at a constant low speed,
The high speed drive circuit D2 operates at a medium speed specified by the speed setting circuit K.
Drive on one hand at high speed.

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 be sewn in the straight section X and the curved section y of the shoulders and collar of the undershirt shown in Fig. 13. The number of stitches can be set.

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. E2 starts counting position signals in response to generation of the coincidence signal from E1, and generates a coincidence signal when the count value matches the number of stitches set by the setting circuit Y.

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 X1 and y so that the high-speed drive circuit D2 and C are activated when a stitch is formed in a predetermined one of the sewing sections X1 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 T'io are respective set times △t1 to △t
It is a timer circuit with to, especially T1, T6, T9
The setting time can be adjusted from the outside, and the shoulder W1, which is held between the shoulder part 7 and the bottom 7 by the engagement piece 27 of the carry-in device 18, is fed by the feed dogs 5 and 6 and the first needle is A timer is set for one hour until the 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 away from above the throat plate 3 and is activated. A protrusion 30 of the plate 31 protrudes upward from the bed 70 guide hole 29.

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 wrinkles of the shoulder W1 along the protrusion 30 are smoothed out by the air flow from the pipe 57, and the shoulder W1 is brought into close contact with the upper surface of the bed 7, and Δt1
After the elapse of time, the buzzer Z stops discharging and the solenoid valve v9 closes, and the solenoid valves V of the air cylinder 21 of the carry-in device 18,
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 portion W between the upper surface 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 arrange the leading edge corresponding to the leading end of the presser foot 13 (Fig. 7 W ′,).

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 to lower 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 motor M is driven by the output of the motor control circuit C13 at a low speed set by the low-speed drive circuit D1, and also acts on the switching circuit F to change the straight section X (13th ), and at the same time open the solenoid valve VIO of the pipe 58 to generate an air flow in the forward direction in the cloth feeding direction to sew the body W on the bed 7.
This acts to move the cloth forward in the cloth feeding direction, and sets the length timer circuits T4 and T5.

The sewing machine 1 is driven at low speed for a period of Δt4 after starting, during which time the body 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 simultaneously ( To be precise, when the needle descends to the lower position), the set time Δt3 of the timer circuit T3 ends, the solenoid valve V of the air cylinder 21 closes, and the engagement piece 27 of the carry-in device 18 returns.
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 applies current to the motor M so as to drive the motor M at the high speed specified by the speed setting circuit K. After that, 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 V 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 force vine device 52 rotates, and cuts the tape T protruding from the cloth tip 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 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 06 to C are controlled by each solenoid valve v6.
~V, is controlled to open.

It is difficult to suture this curved 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 thick curve, the sensor 15 is moved as shown in FIG. The fabric side edge at the front in the fabric 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 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 7, the solenoid valve v8 is opened, the press body 39 of the auxiliary presser device 37 rotates, and the presser section 39a moves against the presser foot 13 to feed the cloth. By pressing the body W against the bed 7 side at the front side in the υ 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 part W, so that 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, the feed amount of the sub-feed dog 6, which opens the solenoid valve v6 of the air cylinder 8 and transfers the body part W while sandwiching it between the subordinate part 13C of the presser foot, is larger than that of the main feed dog 5. When the differential feeder 1 is operated such that the length of the body W is reduced, the degree of elongation of the body W is reduced.

In addition, by opening the solenoid valve v7 of the air cylinder 49, the air cylinder 49 is activated to operate the tape tension device 440 and the rotating body 47.
When the first and second guide rods 48a and 48b intersect the moving 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 by the differential feed 9 and the elongation of the tape by the tape tension, the amount of elongation of the body W and the 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 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
When a coincidence signal is generated, the switching circuit F is switched to the circuit state for sewing the straight section The speed setting circuit K is controlled to drive M again at a high speed.

(However, the comparison circuit E1 is not enabled.

) When the rear edge of the body part W in the cloth feeding direction passes the sensor 59, the detection signal sets the timer circuit T.7, and the high-speed drive circuit D2 becomes inactive for the set time Δt7, and the low-speed drive circuit D , After the carving motor M is driven at a predetermined low speed, the rear edge of the body W passes through the manipulator 14, and when the sensor 15 detects the cloth rear edge of the body W, the detection signal triggers the timer circuit T8. During the set time Δt8, the set time Δt7 of the timer circuit T7 ends and the high-speed drive circuit D2 starts the motor M again.
drive at high speed.

While the body 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 W was temporarily stretched. 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.

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 bed 7.

The sensor 60b detects the rear end of the body part W, and the timer circuit T is set based on the detection signal, and the set time Δt
9, 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, so that the tape is connected to 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 actuating plate 31 so that the protrusion 30 protrudes from the guide hole 29 of the bed 7. At this time, the motor control circuit C13 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 VtO of the pipe 58 to cut off the air flow, and further closes the solenoid valve VtO of the air cylinder 41 of the auxiliary holding device 37. When the valve v8 closes, the suppressor 39 returns to its original state 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.

Thereafter, the set time Δtto of the timer circuit TIO ends, and the solenoid valve v3 is closed to separate the presser foot 13 above the throat plate 3.

When you want to use the front side of the sewing section more widely for threading or other tasks, it is convenient to 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 around the vertical axis. The wider front section makes threading and other tasks easier.

As described above, according to the present invention, in front of the sewing part in the cloth feeding direction, the feed dog is placed on the side in the cloth feeding direction opposite to the fixed reference line, and the stitching is performed inward in the circular arc of the edge to be sewn. By providing an auxiliary presser foot 39 that pinches the outer part of the cloth tape and presses against the top surface of the bed so as to apply acting force to the cloth,
Even if the edge to be sewn follows an inward arcuate curve, the edge to be sewn between the sewing part and the sensor is controlled to be located on the reference line, and even if a presser foot with a main part and a follower foot is used. The cloth is prevented from shifting due to the rotational moment generated by the follower foot, and the edge to be sewn can always be reliably sandwiched between the tape folds before being transferred to the sewing section, thereby aligning the seams and significantly improving the quality of the product. Effects can be obtained.

[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 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)

[Claims] 1. A binder 17 fixedly disposed in front of the sewing machine seam in the cloth feed direction, with one side open in the direction crossing the cloth feed direction so that a flexible tape can be folded along the cloth feed direction, and a binder 17 in front of the binder in the cloth feed direction. Detects the presence or absence of a scheduled stitching line that is fixedly arranged at a distance from the fabric feed line passing through the seam portion and is spaced apart to one side from the fabric feed line passing through the seam portion and is parallel to the fabric feed line 9 and is clear in the fabric feed direction. The free end includes a sensor 15 that generates each signal, and a rotary body 16 that is arranged 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. A sewing machine that has a manipulator 14 that presses a rotary body against the upper surface of the bed, and that sews the inside of a folded tape by pinching a line to be sewn, in which a plurality of rows of teeth are provided to pinch a fabric feed line that passes through the stitching part. Feed dogs 5 and 6 that perform a feed motion in conjunction with the main shaft and can retract and retract above the throat plate; a presser bar that is supported on the machine frame so as to be able to move up and down and always receives a downward elastic force; A main part 13a is fixed to the lower end, is folded by pinching the edge of the cloth to be sewn, and is arranged to sandwich the tape and facing above the feed teeth.
and a slave presser foot 13b which supports the main part so as to be movable up and down and which always receives a downward elastic force and is disposed oppositely above the feed dog and pinches the outer part of the tape of the cloth, and the sewing part. In contrast, in front of the feed dog in the cloth feed direction, the feed dog is placed on the side in the cloth feed direction opposite to the fixed reference line, and the applied force in the direction crossing the cloth feed direction is applied so that the edge to be sewn approaches the fixed reference line. A cloth control device for a sewing machine comprising an auxiliary presser foot 39 which pinches the outer part of the tape of the cloth and presses it against the top surface of the bed so as to give the same effect.