JPS599188B2 - 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 the 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 a tape and a stretchable fabric along an inward arc curve and in the fabric feeding direction, and in particular a device that reliably moves the edge to be sewn along the curve to the stitching part. It is related to.

Conventionally, when using the above-described sewing machine to pinch and sew the edges of the fabric that are to be sewn along the cloth feeding direction within the folded part of the tape that has been bent by the binder, when controlling the manipulator, the sensor controlling the manipulator is sewn in the cloth feeding direction. On the other hand, when the manipulator is closer to the manipulator between the manipulator and the suture section, it is placed on a reference line that is spaced to one side from the cloth feed line passing through the suture section and parallel to the cloth feed direction, so that the edges to be sewn are moved inward. When sewing a tape to a fabric that is stretchable along the circular arc curve and in the fabric feeding direction, the following drawbacks occur.

That is, the manipulator controls the fabric so that the edge to be sewn is always located on the sensor, but when the edge to be sewn of the fabric is an arc, the edge to be sewn between the sewn part and the sensor is located at the reference point as shown in FIG. The tape goes inside the line (dotted chain line) (on the side of the suture area) and is fed into the suture area with the edge to be sewn removed from the bent part of the tape, causing the tape to become unsightly and reduce the quality of the product. When sewing together a fabric tape that is stretchable in the fabric feeding direction, 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. As the fabric shrinks, sewing wrinkles occur, so a sub-feed dog is required for so-called differential feeding, which increases the feed amount of the fabric before the seam. There is a step, and with a normal presser foot, the presser foot that presses against the tape is lifted above the cloth, making it impossible for the sub-feed dog and the presser foot to hold together, resulting in a drawback that normal differential feeding cannot be achieved.

The present invention aims to simultaneously eliminate the above-mentioned drawbacks of the prior art.

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 the sewing machine shown in FIG. The sub-feed dog 6 has a row of sub-feed dogs 6 disposed in the main feed dog 5, and these always have the same feed amount, but due to the action of the air cylinder 8 below the bed 7, the feed amount of the sub-feed dog 6 is larger than that of the main feed dog 5. They are connected to enable so-called differential feeding.

In front of the bed 7 in the cloth feeding direction, there is a main cloth holder 9 which is gently curved in the cloth feeding direction and a sub cloth which connects to the curved surface of the main cloth holder 9 and slopes upward in the cloth feeding direction. A receiving stand 10 is arranged, and the hem of the body part W of an undershirt (running shirt) is held on the sides of the main and sub-cloth receiving stands 9, 10 and the bed 7, and is moved forward in the cloth feeding direction by the action of the air cylinder 11. The moving carrier 12 is arranged and placed.

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 is always positioned on the sensor 15 placed 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 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 is carried by the holding body 1 fixed to the rear part of the sewing machine 1.
9, the frame 20 is supported by a rotating mechanism around a vertical axis, and the frame 20 is elastically engaged with an engaging piece 27, which will be described later, at an operating position opposite to the force on the bed surface in front of the sutured portion. A stoptable locking piece 36 is supported on the machine frame.

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

The free ends of both engaging pieces 2'7 a and b are connected to the shoulder W of the body W.
It is preferably formed into a sword-point shape along the leading edge and one side edge of the bed 7 in the cloth feeding direction, and is slightly inclined downward, and is always spaced upward from the upper 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. When the free ends of the sub-engaging piece 27b are lowered to the upper surface of the bed and pressed into contact with each other, and along the horizontal part 24b, Move the fabric toward the 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 feeding direction (direction of arrow a in FIG. 7).

Regarding the cloth guiding device 28, the main holding piece 2 of the cloth carrying device 18
When 7a is lowered onto the bed 7, guide holes 29 are formed that vertically penetrate through the upper surface of the bed 7 at three positions of the external force along the leading edge in the cloth feeding direction and one side edge of the free end. An operating plate 31, which has three protrusions 30 that appear upward from the hole 29 on the top of the bed, is supported in a rotating manner about a horizontal axis with respect to a support plate 32 fixed to the lower surface of the bed 7. Each protrusion 30 has a winding spring 33.
Wrap it around.

The plunger 35 of the air cylinder 34 fixed to the machine frame is 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 orthogonal to the cloth feeding direction is bent at one end to form a presser section 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. The engaging portion 39b is inserted into the engaging portion 39b, and a U-shaped fitting portion 39c with a gap is protruded from the engaging portion 39b in the horizontal direction.

This pressing body 39 receives an elastic force in the rotational direction (clockwise 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. .

A connecting rod 43 is fixed to a plunger 42 of an air cylinder 41 fixed to the machine frame.
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 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 in this practical example 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 blade of a, supports the base end with respect to the presser foot 13 in a vertically movable manner, and faces the sub-feed dog 6 and always exerts a downward elastic force. A follower portion 13c extends laterally to the holding portion 39a along the receiving 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.
In order 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, the bent lower end of the tape T has an insertion hole (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 six 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 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. Rotating bodies 47 are each supported separately around the center of rotation.
A fixed guide rod 46 as well as a first guide rod 48a facing one side of the linear movement path of the tape and a second guide rod 48b facing the other side are erected and fixed to the rotating body 47, and the tape T When the tape T is transported along a straight path, the first and second guide rods 48a of the rotating body 47 in front of the tape T in the moving direction
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. The movable blade 35 is rotatably supported around an axis 54 along
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 the cooperation of both.

Regarding the blower device (FIG. 1), two pipes 57 and 58 fixed to the frame 20 of the carrying device 19 have their base ends connected to a compressed nitrogen source (not shown) via electromagnetic valves Vg + VlO, which will be described later. The open end of one of the tubes 57 faces above the lowered position of the engaging piece 27 and is opened downward along the direction intersecting the cloth feeding direction near the cloth feeding line passing through the seam part. The other tube 58 is arranged so as to open downward along the cloth feeding direction outward from the other tube 58.

Cloth sensors 59, 60a, 60b are light sources (not shown)
The presence or absence of cloth on the head 7 is detected by receiving the light, and a cloth detection signal for each state is generated.

The cloth sensor 59 is arranged in front of the guide hole 29 of the bed 7 in the cloth feeding direction and on the side of the manipulator 14, 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, sensors 60a, 60b
are arranged at a distance in front and back in the cloth feeding direction on the side blade of the presser foot 13, and are used to set the activation timing of the electromagnet 56 of the tape cutter device 52, and only one of them is selectively effective at any time. be converted into

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

It should be noted that the sewing machine of this embodiment is 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, ■1 is the solenoid valve of the air cylinder 21 of the cloth carrying device 18, ■2 is the solenoid valve of the air cylinder 34 of the cloth guide device 28, and ■3 is the solenoid valve of the air cylinder 34 of the cloth guide device 28. 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 against the upper surface of the bed 7; V5 is a solenoid valve for operating the fabric carrier 12; The solenoid valve of the air cylinder 11, ■6 is the air cylinder 8 for differential feeding.
, ■7 is the solenoid valve of the air cylinder 49 of the tape tension device 44, ■8 is the solenoid valve of the air cylinder 41 of the auxiliary holding device 37, and ■, is the solenoid valve of the air cylinder 41 of the blower device 5.
Solenoid valve that opens and closes the nitrogen flow generated in 7 % VIO is pipe 5
This is a solenoid valve that opens and closes the rush air flow generated at 8.

These solenoid valves 1 to VIO are individually activated or deactivated under the control of the respective solenoid valve control circuits 01 to CIO.

In particular, the control circuit C of the air cylinder 11 of the cloth carrier 12 controls the solenoid valve 5 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 Cl
Sound is generated intermittently for a time set by the operator under the control of l.

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 CI2.

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

The low-speed drive circuit D1 drives the motor 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 sew the straight section X and the curved section y of the shoulder and collar of the undershirt shown in Fig. 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 (pulse transmission per rotation of the main shaft of the sewing machine), and El matches the number of stitches set by the number of stitches setting circuit X. E2 starts counting position signals in response to the generation of the coincidence signal from B1, and when the count value matches the number of stitches set by the setting circuit Y, it generates a coincidence signal.

F is a switching circuit, which is a control circuit C6 for solenoid valves ■6 to ■9.
The operation timing is selectively set in one of the sewing sections X or y so that C9 and the high-speed drive circuit D2 are activated when a predetermined 10,000 stitches are formed in the sewing sections X or y.

S is a selection switch for enabling or disabling electromagnetic valves (6) and (7) which operate the differential feed and tape tension devices.

T1~T1o are each set time △t1~tt
It is a timer circuit with o, especially T 1y T6 t
T, can be adjusted from the outside for a set time, and T3 is the shoulder portion W1, which is held between the bed 7 by the engagement piece 27 of the carrying device 18, is sent by the feed dogs 5 and 6 to the first position. A timer is set for one hour until the needle drops.
T4 is configured 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 (2) and (3) of the air cylinder (not shown) for raising and lowering the presser bar and the air cylinder 34 of the cloth guide device 28 are open, and the presser foot 13 is separated above the throat plate 3. At the same time, the protruding portion 30 of the actuating plate 31 protrudes upward from the guide hole 29 of the bed 7.

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 9 is opened so that a sound is generated intermittently for a set time Δt1 of T1 and an air flow is generated in the pipe 57.

The wrinkles of the shoulder W1 along the protrusion 30 are smoothed out by the nitrogen 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 elapsed time, the buzzer Z stops sounding and the solenoid valve ■, closes, and the solenoid valve ■1 of the air cylinder 21 of the carrying device 18 closes.
and close the solenoid valve 2 of the air cylinder 34 of the cloth guide device 28.

The protruding part 30 descends below the bed 7, and the pin 25 is guided by the vertical part 24a of the grooved cam 24, and the main and sub-engaging pieces 27a,
27b descends and presses the shoulder portion W1 between it and the top surface of the bed 7, and at the same time, 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 side 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. 7 W-1). ).

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 3 to lower the presser foot 13. Then, open the solenoid valve ■4 of the air cylinder (not shown) of the manipulator 14 to 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 mork M at a 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 so as to sew the body W on the bed 7, and at the same time, the solenoid valve ■1o of the pipe 58 is opened to generate an air flow in the forward direction in the cloth feeding direction.
Send the cloth? It acts to transfer the signal to the destination, and also sets the timer circuits T4, T,.

The sewing machine 1 is driven at low speed for a period of Δt4 after being started, during which time the body W and tape T are transferred to the sewing part by the feed dog, and a seam is formed at the tip in the cloth feed direction almost at the same time ( To be precise, when the needle descends to the lower position), the set time Δt3 of the timer circuit T3 ends, the solenoid valve ■1 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 I)2 is activated, the circuit D2
supplies current to the motor M to drive the mork 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 Δt of the timer circuit T5 ends, and the solenoid valve ■5 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 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 a direction crossing the cloth feeding direction, based on the cloth detection operation of the sensor 15, so as to send the side edge of the body IllilW to the sewing part. Further, the comparison circuit E1 counts the needle position signal from the needle position detection means P.

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 At this time, a coincidence signal is generated from the comparator circuit El to put the comparator circuit E2 into the active state and switch the switching circuit F to the circuit state for sewing the curve section y, and the drive speed of the motor M changes to the setting circuit K by its output. Control.

In addition, the control circuits 06 to C9 are controlled by each solenoid valve ■6 according to its output.
~V, is controlled to open.

It is difficult to stitch this curve section y.

That is, the gear 16 of the manipulator 14 controls the cloth so that the cloth side edge is always positioned on the sensor 15, so that when the cloth side edge has a large curve, the cloth feed of the sensor 15 is controlled as shown in FIG. The fabric side edge on the front side of the fabric moves outward with respect to the fabric feed line passing through the seam portion (three-dot chain 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, in this case, the speed of the sewing machine motor M is lowered to facilitate cloth control by the manipulator 14, and the solenoid valve 2 of the pipe 57 is opened to direct the air flow in the direction of the arrow g (
(Fig. 9) onto the body W on the bed 7, and the solenoid valve 8 is opened and the pressing body 39 of the auxiliary presser device 37 is sprayed.
rotates, and the presser foot 39a presses the body W against the 1 surface of the bed on the side in front of the presser foot 13 in the cloth feeding direction, so that the presser foot 39a rotates counterclockwise (
9) is applied to the body part W, and due to this rotational moment of the air flow, the body part W between the sensor 15 and the seam receives a force in the direction of the cloth feed line, and the end edge of the body part 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 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, if 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 Since the body W shrinks after being sewn, wrinkles are generated.

Therefore, as in this embodiment, the solenoid valve 6 of the air cylinder 8 is opened, and 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 adjusted to the main feed dog 5. On the other hand, if the differential feeding is performed to increase the amount, the degree of elongation of the body W is reduced and the body is fed.

In addition, by opening the solenoid valve 7 of the air cylinder 49, the air cylinder 49 is actuated, and the rotating body 47 of the tape tension device 44 is
When the first and second guide rods 48a and 48b intersect the movement path of the tape T and bend the tape into a "<" shape, tension is applied to the tape T and the sutured portion is formed. The tape in between is stretched and transferred to the suture area.

Due to the synergistic effect of the reduction in the 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 the tape T are equalized during sewing, and no creases are generated 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 by the number of stitches setting circuit Y, that is, between the curve section y and the next straight line. When the border with section X reaches the sutured part, comparison circuit E2
A coincidence signal is generated from , the switching circuit F is switched to the circuit state for sewing the straight section As an effect, the speed setting circuit K is controlled 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 the high-speed drive circuit D2 becomes inactive for the set time Δt7, and the low-speed drive circuit D1 starts the motor. After M is driven at a predetermined low speed, the rear edge of the body W passes through the manipulator 14, and when the sensor 15 detects the cloth rear edge of the body W, a timer circuit T8 is set by the detection signal, 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 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, 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 4 closes, and the manipulator 14 is separated upward Δ 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 5 of the air cylinder 11 is closed to return the carrier 12, and the electromagnet 56 is energized to operate the moving blade 55 of the tape cutter device 52 to cut the body after the body W. At the same time as cutting the tape T port connected to the end, open the solenoid valve 2 and actuate the air cylinder 34 of the cloth guide device 28 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 C13 is also 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 ■, 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 pipe 58 to cut off the air flow. The solenoid valve (8) closes and the pressing body 39 returns to its original position, setting the timer circuit 'I'to.

Since the pressing body 39 continues to act until the end of this sewing, the cloth feeding after the rear edge of the body W passes through the manipulator rake 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 from the time the rear end of the body W comes out of the manipulator 14 until it is sent to the seam, 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 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 so that the edge of the body W is always located within the folded part of the tape T.

Thereafter, when the set time Δtto of the timer circuit TIO ends, the solenoid valve 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 a sewing machine that sews a tape and a cloth whose edges to be sewn are along an inward arcuate curve and are stretchable in the cloth feeding direction, By providing the auxiliary presser foot 39 so as to apply an acting force in the direction crossing the cloth feeding direction when approaching the reference line, the spring is applied so as to bring the edge to be sewn between the sewing part and the sensor closer to the reference line. Since the tape can be moved, the edge to be sewn can always be held in the folded part of the tape while being fed into the suturing part, and the presser foot 13 is equipped with a subordinate presser foot 13c which has a vertical movement function and receives a downward elastic force. By sandwiching the outer part of the fabric tape and protruding toward the front in the fabric feeding direction, facing above the sub-feed dog, the fabric on the sub-feed dog can always be securely held by the follower foot to ensure normal differential feeding. Therefore, by feeding the cloth in front of the seam in advance to prevent the cloth from elongating, a product without wrinkles can be obtained, and the quality of the product can be improved.

In addition, when the fabric is moved toward the reference line by the auxiliary presser foot 39, it is pushed upward between the upper bent end of the tape and the subordinate presser foot and is bent, so that the edge to be sewn is not inserted into the tape bending part. Although wrinkles may remain, the provision of the extension portion 13b of the presser foot along the follower foot prevents the fabric from bending upward, making it possible to reliably insert the edge to be sewn into the folded portion of the tape. can get.

[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)

[Scope of Claims] 1. A binder 17 which is fixedly disposed in front of the sewing machine stitching part in the cloth feeding direction and has one side in the crossing direction of the cloth feeding direction open so that the flexible tape can be folded along the cloth feeding direction.
and the presence or absence of an edge to be sewn along the fabric feeding direction of the fabric at a fixed reference line that is placed in front of the binder in the fabric feeding direction, is spaced to one side from the fabric feeding line that passes through the stitching part, and is parallel to the fabric feeding direction. A sensor 15 detects and generates respective signals.
Then, a rotating body 16 is placed in front of the sensor in the cloth feeding direction and rotates forward and backward around an axis parallel to the cloth feeding direction in response to the sensor signal. The manipulator 14 is provided with a manipulator 14 that allows the edges to be sewn to extend and contract along the inward arcuate curve and in the cloth feeding direction i5]'
In a sewing machine that sews together cloth and tape, the main feed dog 5 is provided with a plurality of rows of teeth sandwiching a cloth feed line passing through the seam portion, and the main feed dog 5 and the seam portion are arranged so that the feed movement is performed in conjunction with the main shaft of the sewing machine. 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 protrudes and retracts from the throat plate in conjunction with the main shaft to perform a larger feed movement than the main feed dog, and a machine frame. The presser foot is supported by vertical movement l'Tr and always receives downward elastic force, and the presser foot is fixed to the lower end. The presser foot has an auxiliary presser foot 39 that pinches the outside of the cloth tape and presses it against the top surface of the bed so as to apply an acting force in the direction crossing the cloth feeding direction when approaching the reference line. The main part 13a is arranged facing above the main feed dog with the main part 13a in between, and the auxiliary presser foot side is arranged facing above the throat plate between the main feed dog and the sub feed dog with the outer part of the cloth tape in between, along the cloth feeding direction. The extension part 13b protrudes from the main part in both directions, and the extension part 13b supports the main part in a vertically movable manner and always receives downward elastic force. A cloth control device for a sewing machine, characterized in that a slave presser foot 13C is provided above the sub-feed dog to sandwich the feed dog.