JPS595317B2 - Sewing machine cloth control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a sewing machine that forms a seam along one edge of a cloth along the cloth feed direction, and starts sewing the one side edge of the cloth on the cloth feed line passing through the seam part. The present invention relates to a cloth control device for a sewing machine that moves forward in advance, and particularly to a device for making the operation easier and more reliable.

Conventionally, in a sewing machine that forms a seam along one edge of a cloth as described above, the operator manually positions the part of the one edge to be sewn on the fabric feed line passing through the seam part. The fabric was placed before starting sewing, but the worker had to visually check the area to be sewn along the fabric feed line that passes through the seam, making the work complicated and reducing work efficiency. At the same time, the stitches are sewn without matching the sewing area and the fabric feed line, resulting in uneven stitches, resulting in drawbacks such as deterioration of the quality of the product.

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

An embodiment of the present invention will be described with reference to the drawings. A sewing machine 1 is operated in conjunction with a motor (not shown) and uses two needles 2 and a part of a looper (not shown) to stitch two chainstitch N (12th stitch).
This is a well-known decorative stitch sewing machine that forms the sewing machine shown in FIG. These feed teeth 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. This allows for so-called differential feed.

In front of the bed 7 in the cloth feeding direction, there is a main cloth holder which is gently curved in the cloth feeding direction and a auxiliary cloth which is connected to the curved surface of the table 9 and slopes upward in the cloth feeding direction. The receiver is placed with a stand 10, the main and sub-cloth receivers are with stands 9 and 10, and an undershirt (running shirt) is placed on the side of the bed 1.
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.

Opposed to the upper force of the feed dog, the presser foot 13, which is fixed to the lower end of the presser bar and moves up and down by the action of an air cylinder (not shown), is placed on the upper surface of the bed 7 by the action of an air cylinder (not shown) at the front in the material feeding direction. 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 used to feed one of the shoulders Wl and W2 of the body W held on the carrier 12 to the sewing section before sewing starts, and is carried by the holder 1 fixed to the surface of the sewing machine 1.
9 supports a frame 20 rotatably about a vertical axis, and this frame 20 can be elastically locked in an operating position where an engaging piece 2T, which will be described later, faces above the bed surface in front of the sutured portion. The stopper locking piece 36 is supported on the machine frame.

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

The free ends of both securing 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 bet 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-retaining piece 27b are lowered to the upper surface of the bed and pressed against each other so that the free end of the sub-retaining piece 27b engages with the shoulder W1 on the inner side thereof, 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 Wl 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 the direction crossing the feed direction (clockwise in Figure 1).

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, a guide hole 29 is formed which vertically penetrates through the upper surface of the bed 7 at the outer third position along the leading edge in the cloth feeding direction and one side edge of the free end. An actuating plate 31, which has three cylindrical protrusions 30 upright that can extend and retract above the bed top surface through each guide hole 29, is rotatable about a horizontal axis relative to a support plate 32 fixed to the top surface of the bed 7. Each protrusion 30 has a spring 33.
Wrap it around.

The plunger 35 of the air cylinder 34 fixed to the machine frame can be held on the action plate 31, and its action causes the action plate 31 to
is rotated so that the coiled spring 33 is bent between it and the bed 7, and the protruding part 30 is caused 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 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 suppressor 39 receives an elastic force in the rotating direction (clockwise in FIG. 1) by a coiled spring 40 whose one end is fixed to the machine frame so that the presser 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, 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 is raised by the action of the air cylinder 41, and 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, the retaining part 39b The pressing body 39 resists the elastic force of the coiled spring 40 and moves counterclockwise so that the presser part 39b is separated upward from the throat plate 3 (FIG. 1). Rotate to.

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

In addition, the swash plate 3 corresponds to the main feed dog 5, and has a stepped portion 3a that is lowered by the thickness of the tape T at the front side in the cloth feed direction from the needle drop point.
The bent lower end of the tape T can be inserted to facilitate the loading of the body W by the engagement piece 2T of the loading device 18 and to prevent the tape T from turning over (FIGS. 5 and 6).

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

In both of the support stands 45, a fixed guide rod 46 that stands up on one side of the moving path of the tape T moving along a linear path is fixed to each support stand 45, and a vertical axis is attached to each support stand 45. The rotating bodies 47 are individually supported so as to be rotatable around the center.
A first guide rod 48a facing one side of the linear movement path of the tape and a second guide rod 48b facing the other side are erected and fixed to the rotary body 47 in the same way as the fixed guide rod 46, and the tape T When the tape T is transported along a straight path, the first and second guide rods 48a of the rotary body 47 in the forward direction of the tape T movement direction are
lb 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 4T of both support stands 45, and when the plunger 50 is actuated, the first and second guide rods 48a and 48b intersect the moving path of the tape T. The rotating body 47 is rotated by a certain angle so that 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 arranged 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 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 5B fixed to the frame 20 of the carrying device 18 have their base ends connected to a compressed air source (not shown) and a solenoid valve V9. Each tube 57 communicates with the other through the VIO, and the open end of one of the tubes 57 is connected to the engagement 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 crossing the cloth feeding direction near the cloth feeding line passing through the seam part, and the other tube 58 is arranged so as to open downward in the direction crossing the cloth feeding direction. The holes are arranged downward along the feeding direction.

The cloth sensors 5L60a, 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 installed 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, 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 designed to always stop in accordance with the needle down position.

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

In the figure, ■1 to V10 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. V4 is the solenoid valve of the air cylinder (not shown) for raising and lowering the presser bar, and V4 is the manipulator 14 connected to bed 7.
A solenoid valve of an air cylinder (not shown) for pressure contact with the upper surface; ■5 is an air cylinder 1 that operates the commercial carrier 12;
1 solenoid valve, 6 a solenoid valve of the air cylinder 8 for differential feeding, 7 a solenoid valve of the air cylinder 49 of the tape tension device 44, and 8 a solenoid valve of the air cylinder 41 of the auxiliary presser device 37. 9 is a solenoid valve that opens and closes the air flow generated in the pipe 57 of the blower device, and Vlo is a solenoid valve that opens and closes the air flow generated in the pipe 58.

Each solenoid valve control circuit 0 of these solenoid valves ■1 to Vo
1 to C1o are individually activated or deactivated.

In particular, the control circuit C6 of the air cylinder 11 of the commercial carrier 12 controls the solenoid valve V5 so that the carrier 12 moves at approximately the same speed as the moving speed of the body W driven by the sewing machine.

Z 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 C1□.

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

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

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

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

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

F is a switching circuit, which is a control circuit 06 for solenoid valves ■6 to ■.
The operation timing is selectively set in one of the sewing sections X or y so that the high-speed driving circuit D2 and C0 are activated when a stitch is formed in a predetermined one of the sewing sections X or y.

S is a solenoid valve V6 that operates the differential feed and tape tension device. This is a selection switch to enable or disable V7.

T1 to T1o are respective set times △t1 to △tt
It is a timer circuit with T1. T.

T, can be adjusted from the outside for a set time, and T3 is a shoulder portion W1 which is held between the bed 7 by the engagement piece 27 of the carrying device 18 and 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.

Both electromagnetic valves for the air cylinder (not shown) that raises and lowers the presser bar in the initial state and the air cylinder 34 of the cloth guide device 28; 2. (3) is open, the presser foot 13 is spaced upward from the throat plate 3, and the protruding portion 30 of the operating 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 an opening sound of a set time Δt1 of T1 is generated intermittently 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 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 time has elapsed, the buzzer Z stops sounding, the solenoid valve (2) closes, and the solenoid valve V1 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 the pin 25 is guided by the horizontal portion 24b, and the main and sub-engaging pieces 27a and 127b move in the direction of the arrow in FIG. Insert one end of the shoulder W1 between the tape T 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 V4 of the air cylinder (not shown) of the manipulator 14 to open the gear 1 at the tip.
6 holds the body W and presses it against the surface of the bed 7 with an appropriate force, and at the same time, the timer T2. Set T3.

After Δt2 of the timer T2 has elapsed, the motor M is driven by the output of the motor control circuit C13 at the low speed set by the low speed 1 drive circuit D1, and also acts on the switching circuit F to change the linear section 13), and at the same time open the solenoid valve V10 of the pipe 58 to generate an air flow in the forward direction of the cloth feeding direction to transfer the body W on the bed 7 forward in the cloth feeding direction. The timer circuit T4. Set 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 V1 of the air cylinder 21 closes, the engagement piece 27 of the carry-in device 18 returns, and immediately after that When the set time Δt4 of the timer circuit t4 ends and the high-speed drive circuit D2 is activated, the circuit D2 supplies current to the motor M so as to drive the motor M at the high speed specified by the speed setting circuit. Thereafter, the leading edge of the body W reaches the sensor 60a, generates a detection signal, and sets the timer circuit T6.

Immediately after that, the set time Δt5 of the timer circuit T5 ends and the solenoid valve V5 of the air cylinder 11 of the carrier 12 is opened.
The carrier 12 moves forward in the cloth feeding direction at approximately the same speed as the movement speed of the body W by the sewing machine 1.

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

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

When the counted value matches the preset number of stitches in the stitch count setting circuit X, which is set in advance to the number of stitches required to sew the straight 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.

In addition, the output controls the control circuits C6 to C9 to each solenoid valve V6.
~■, is controlled so that it opens.

It is difficult to stitch this curve section y.

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

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

However, here, the speed of the sewing machine motor M is lowered to facilitate cloth control by the manipulator 14, and the solenoid valve V of the pipe 57 is opened to direct the air flow in the direction of the arrow g (
9) onto the body W on the bed T, the solenoid valve 8 is opened, the press body 39 of the auxiliary presser device 37 rotates, and the presser section 39a is pressed against the presser foot 13. By pressing the body W against the bed 7 side at the front side in the feeding direction, a rotation moment is applied to the body W in the counterclockwise direction (FIG. 9) around the presser part 39a, and
Due to this airflow and rotational moment, the body part W between the sensor 15 and the seam part receives a force acting in the direction of the cloth feed line, causing its edge to lie along the inside of the folded part of the tape T.

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

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

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

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 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 seam is The tape is transferred to the suture area 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 by the number of stitches setting circuit Y, that is, between the curve section y and the next straight line. When the border with section X reaches the sutured part, comparison circuit E2
A coincidence signal is generated from , the switching circuit F is switched to the circuit state for sewing the straight section X, and the solenoid valve ■6. ■7. (2) Close the circuit 9 and control the speed setting circuit K so that the differential, tape tension, and feed blower devices are inactive, and the motor M is driven at high speed again.

(However, the comparison circuit E1 is not enabled.

) When the trailing edge of the body W in the cloth feeding direction passes the sensor 59, the detection signal sets the timer circuit T7, and the high-speed drive circuit D2 becomes inactive for the set time Δt, and the low-speed drive circuit D1 After the 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 rear edge of the cloth 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 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 1.

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 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
9 is completed, the solenoid valve 5 of the air cylinder 11 is closed to return the carrier 12, and the electromagnet 56 is energized to operate the movable blade 55 of the tape cutter device 52 to cut the back end of the body W. At the same time as cutting the continuous tape T, the solenoid valve 2 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 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 V10 of the air cylinder 11 of the carrier 12 closes and returns to its original position, and the solenoid valve V10 of the pipe 58 closes and returns to its original position.
is closed to cut off the air flow, and further, the solenoid valve v8 of the air cylinder 41 of the auxiliary holding device 37 is closed, the pressing body 39 is returned to its original position, and the timer circuit TIO is set.

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

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, there is a timer circuit T.

When the set time ΔtlO ends, the solenoid valve V3 is closed and the presser foot 13 is separated to the north of the throat plate.

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, by simply arranging the leading edge and one side edge of the cloth along the protruding portion projecting above the bed, the detecting means detects the cloth and activates the cloth feeding means 18. In addition, since the cloth guide means 28 is made inactive and the part of the cloth to be sewn can be moved onto the cloth feed line passing through the seam part, the work is simplified and work efficiency is significantly improved, and the part to be sewn and the cloth are moved easily. Since the feed lines always match reliably, the stitches are aligned and the quality of the product is improved.

[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. In a sewing machine that forms a seam along one edge of the cloth along the cloth feed direction, the cloth feed direction line and the line on one side of the cloth feed line passing through the seam part in front of the sewing machine seam part in the cloth feed direction. A plurality of guide holes 29 are formed on the intersection line and penetrate through the top surface of the bed, and a plurality of protrusions 30 are provided that can be projected and retracted from the top surface of the bed from each guide hole. A guide means 2 having a non-active position and an actuating body 31 supported below the bed so as to be rotatable about a horizontal axis and always receiving an elastic force to the non-active position.
8, a detection means 59 disposed within the intersection formed by the guide hole along the cloth feed line passing through the guide hole on the cloth feed direction line, detecting the presence or absence of cloth and generating a detection signal when detecting the cloth; A retaining piece 27 having an outer periphery along the intersecting sides of the means is always spaced above the bed, and the retaining piece is placed on the bed within the intersecting sides of the guide means and lowered to hold the cloth. The cloth carrying means 18 is actuated by the action of a cloth carrying means 18 which is horizontally movable on the bed so that one end edge is moved along the cloth feeding direction beyond the cloth feeding line passing through the seam part, and the leading edge moves to the feeding pawl stop. a first actuating means that connects the plate so as to rotate to the operating position, acts in connection with the generation of a signal due to power-on or operation, and becomes inactive in connection with the generation of the detection signal; and a second actuating stage operatively connected to actuate the engagement piece.