JPS5847196B2 - cycle sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cycle stitch sewing machine that is driven by a starting operation and stops after forming a predetermined number of stitches. - formed so as to be located at different distances from the sewing machine, in conjunction with an oscillating body that is guided from the beginning end to the end end of the guide part during cycle sewing and oscillates about a fixed axis within the sewing machine sewing area. The fabric clamping means that clamps the workpiece is moved on the sewing machine bed so that the starting position and the stop position when the stitch formation is completed are different, and the first stitch and the last stitch are in different positions on the workpiece. This invention relates to a cycle stitch sewing machine in which a return means which forms a stitch and operates in connection with stopping the sewing machine returns a oscillating body from the end of the guide section to the start end, thereby returning the cloth holding means to the starting position. be.

A practical example of the present invention will be described below with reference to the drawings. On the support stand 1, there is a sewing machine, such as a bar tack sewing machine, which is started by an operator's operation of a foot pedal or the like and stops after forming a predetermined number of stitches. Install the cycle stitch sewing machine 2,
A cloth feeding mechanism 3 for feeding cloth into the sewing machine 2 is installed on the left side thereof.

First, as shown in Figs. 3 and 4, this sewing machine 2 has a drive pulley that is always rotated in conjunction with a drive motor (not shown) via a belt 4 on a main shaft (not shown) protruding from the rear end surface. 5, the main shaft is rotated counterclockwise from the solid line position in FIG. A cam 8 is supported on the side of the sewing machine frame (right side in Fig. 1) and rotates at a reduced speed counterclockwise in conjunction with the main shaft. The shaft 8 has a guide groove 10 for controlling the movement of a board 9 formed on a disc and slidably installed on the bed of the sewing machine from side to side so that its starting position and stopping position are different. Its starting point 1
The cutoff lever 7 is set at the stop position on the external surface with the feed cam 11, which is formed so as to be close to the axis of the camshaft 8 from 0a to the terminal end 10b, and whose ends are communicated through a return groove 10C. (solid line position in Fig. 4) is formed with a recess 02a for controlling the cutoff lever 7 by the outer peripheral edge.
A control cam 12 on a disk is fixed so that the control cam 12 is locked in the counterclockwise rotation state, and one end of the control cam 12 is engaged with the outer peripheral edge of the control cam 12 on the lower right machine frame surface. An intermediate portion of an L-shaped control lever 13, which is provided with a roller 13a and has an engaging portion 13b at the other end that engages with a contact point of a second switch, which will be described later, and an arcuate hole 13c that is long in the vertical direction; A locking piece 14 with a bent tip is provided at one end thereof, and a stepped portion 15a is provided at the lower edge of the other end.
The intermediate portion of the transmission lever 15 formed with a
(not shown) applies a counterclockwise force to the control lever 13 to keep the roller 13a in pressure contact with the outer peripheral surface of the control cam 12.

Further, as shown in FIG. 4, one end of a horizontal link 17 is fixed to the base of the cutoff lever 7 so that the other end projects horizontally, and one end of a connecting link 18 is rotatably attached to the other end. The other end of the connecting link 18 and the transmission lever 1
The other end of the control lever 13 is connected to the other end of the control lever 13 by a step screw 19 having a step loosely fitted into the circular arc hole 13c of the control lever 13.

As shown in FIG.
is fixed, and this branch 20 has two connecting parts 21a at one end.
, 21b is rotatably supported by a shaft 22, and a spring 23 wound around the shaft 22 always applies a clockwise force to the connecting portion 2.
1a and the other end of the transmission lever 15 are connected by a connecting rod 24 that freely passes through the support base 1, and the transmission lever 15 is moved by the above-mentioned force of the operating lever 21 via the connecting rod 24.
The stepped portion of the stepped screw 19 connecting the transmission lever 15 and the other end of the connecting link 18 receives an acting force in the counterclockwise direction (FIG. 4) centering on the control lever 13. It comes into pressure contact with the upper end of the hole 13c.

Further, a foot pedal 25 is disposed below the support base 1, and the other connecting portion 2 of the foot pedal 25 and the operating lever 21 is
1b is connected by chain 26.

In FIG. 3, a support shaft 27 is installed at the lower left of the side surface of the sewing machine frame, and this support shaft 27 has a roller 23 at one end that fits into the guide groove 10 formed on the surface side of the feed cam 11.
The middle part of the swing link 29 is swingably supported, and an electromagnet 30 is disposed in the sewing machine bed below the middle part of the swing link 29, and the armchair 30a and one end of the swing link 29 are connected by a chain 31.
Connect by.

In addition, the sewing machine bed has @ provided on the board 9 at the upper end.
A guide shaft 32 provided with a track groove (not shown) for fitting into the rearward guide hole 9a (FIG. 6) and guiding the board 9 in the front-back direction is installed so as to be swingable about a vertical axis. This guide shaft 32 and the other end of the swing link 29 are connected to the swing link 2
When the guide shaft 9 swings, the guide shaft 32 is connected by the connecting link 33 so as to swing around the axis.

As shown in Fig. 6-7, a cylindrical guide body 37 with a needle hole 36 formed in the center thereof through which the needle 35 of the needle bar 34 passes is formed at the sewing machine suture part of the sewing machine bed and protrudes from above the bed surface. Further, a cloth support plate 38 is fixed to the tip of the substrate 9 to support the cloth at the sewing machine seam part, and the cloth support plate 38 has a straight line in the left and right direction, and has a loose structure that is free from the external cause of the guide body 37. A cam groove 39 to be fitted is formed.

The base of a presser arm 40 whose tip extends below the chin of the sewing machine is fixed to the upper surface of the middle part of the base plate 9, and the tip of the presser arm 40 has a support that supports two upper and lower plates 41 and 42 in a vertically movable manner. The frame 43 is fixed, and the lower end of one of the upper and lower plates 41 is formed into a flat rectangle, and the cam groove 3 of the cloth support plate 38 is formed in the center of the frame 43.
A lower leg foot 44 having a linear needle hole 44a corresponding to the needle hole 44a and a large number of round holes 44b formed at regular intervals on both sides of the needle hole 44a is fixed, and the other upper and lower plates 42 are fixed.
At the lower end, an upper presser foot 45, which is formed into a flat rectangle having the same shape as the lower presser foot 44 and has a needle hole 45a corresponding to the needle hole 44a, is placed above the lower foot foot 44. The upper presser foot 45 has round holes 4 on the lower surface of the upper presser foot 45 at positions corresponding to the round holes 44b of the lower presser foot 44 before and after the needle drop hole 45a when the upper presser foot 44 and the upper presser foot 45 overlap.
A number of needles 46 are fixedly arranged and protrude slightly from the underside of the lower leg 44 through the lower leg 4b.

In addition, the upper and lower plates 41 located within the support frame 43 are provided with long holes 47 in the vertical direction. Hole 4
A short hole 48 corresponding to 7 is formed, and the tip of the presser arm 40 is rotatably supported on both sides by stepped screws 49 (only one shown), and is always rotated counterclockwise by a spring 50 (only one shown). (Fig. 3) Pressing plate 51 that applied the acting force to
51 is inserted into the long hole 47 and the short hole 48 through a hole (not shown) provided on the rear end surface of the support frame 43, and the acting force causes the upper and lower plates 41 and 42 to be constantly attached. Gives downward force.

A horizontal shaft 52 in the left and right direction is rotatably supported in the middle part of the presser arm, and both ends thereof protrude from both sides of the presser arm 40, and one end thereof protruding from one side is curved upward. Attach one end of the suppression shaft 53 to the right end (Fig. 3).
The middle part of the rotating body 54 is fixed so that it projects horizontally in substantially the same direction as the horizontal axis 52, and the left end of the rotating body 54 and the pressing plate 51 are connected by a link 55 to rotate the rotating body 54 in the clockwise direction. As a result of the movement, the press plate 51 is connected so as to rotate clockwise.

On the other hand, one end of a connecting body 56 is fixed to the other end of a horizontal shaft 52 protruding from the other side of the presser arm 40, and the other end and the pressing plate 5
1' are connected by a link 55' so that the pressing plate 51' rotates in the same direction as the one pressing plate 51 through the rotation of the horizontal shaft 52 caused by the rotation of the rotating body 54.

Inside the sewing machine arm, a pair of hook-shaped links 57 are rotatably supported in the middle, and at the horizontal ends of these links 57, the upper end of a lifting plate 58 is placed above the pressing shaft 53, and its lower edge is Connected so as to intersect with the shaft 53, the link 5
The left end (Fig. 3) of a horizontally long connecting plate 59 is connected to the vertical part of 7, and the right end of the connecting plate 59 is linked to a presser foot control mechanism 60 installed on the rear end surface of the sewing machine frame (not shown). are doing.

This presser control mechanism 60 is the same as that described in Japanese Patent Application Laid-open No. 48-69648 filed by the present applicant, and is driven by the belt 4 on an intermittent shaft 61 rotatably supported on the machine frame. The rotation of a pulley (not shown), which is fully rotated in conjunction with the motor, is transferred to the intermittent shaft 6 via a spring clutch or the like interposed between the pawl body 62 installed on the intermittent shaft 61.
1, and the rotation of the intermittent shaft 61 moves the connecting plate 59 in the left-right direction via a linkage mechanism (not shown) interposed between the intermittent shaft 61 and the right end of the connecting plate 59, as will be described later. The action moves the flat presser foot 44, 45 on the upper shaft up and down with respect to the upper surface of the cloth support plate 38, and the intermediate part is rotatably supported on the rear end surface of the machine frame by a step screw 65, and a They face each other with the claw body 62 in between, and one side is the claw body 62.
When the two engaging bodies 63 and 64 are in the engaged position, the other is in the disengaged position, and the engagement with the pawl body 62 interrupts the interlocking movement between the pulley and the intermittent shaft 61. The locking body 63 and the pawl body 6 are always rotated counterclockwise by a spring 66 which has a weaker acting force than the spring 23 which applies a clockwise rotational force to the operating lever 21.
2 are engaged (as shown by the two-dot chain line in FIG. 4) to cut off rotational transmission of the pulley to the intermittent shaft 61, the connecting plate 59 stops at the left position, and at this time, the lower edge of the lifting plate 58 It is located at a position that leaves a certain distance from the suppression axis 53.

Further, when the operating lever 67 is rotated clockwise, the engagement between the locking body 63 and the pawl body 62 is released, and thereby the intermittent shaft 61 and the booley are interlocked to rotate the intermittent shaft 61. After half a rotation, the locking body 64 and the claw body 62 engage and the interlocking movement is interrupted again. During this period, the connecting plate 59 moves from the left position to the right position and stops, and this movement As a result, each hook-shaped link 57 rotates counterclockwise, and the elevating plate 58 descends, and as a result of this descent, its lower edge pushes up the pressing shaft 53 to rotate the rotating body 54 clockwise, and at the same time, the half shaft 5
2, the coupling bodies 56 are also pivoted, and the respective links 55.
The pressing plates 51 and 51' are rotated clockwise through the upper and lower plates 41 and 55', and the tips of the respective upper and lower plates 41 and 42 engaged in the long holes 47 and short holes 48 are raised, and first one side is rotated clockwise. The upper and lower plates 42 of the upper and lower plates 42 are connected so that the upper ends of their short holes 48 are connected to the long holes 4 of the other upper and lower plates 41.
After rising until it matches the top of 7 (B in Figure 5),
Furthermore, both upper and lower plates 41, 42 are simultaneously raised by a certain amount.

Therefore, the upper flat presser foot 44.45 fixed to the lower end of each
After the presser foot 45 rises by a certain amount and rises from the upper surface of the flat presser foot 44, the flat presser foot 44 comes to rise together with the upper presser foot 45.

On the other hand, the other end of the clamping lever 67 and the other end of the operating lever 21 are connected by a chain 68 that freely passes through the support base 1, so that the spring 2 is always
3, the operating lever 67 is pulled against the action force of the spring 66 to the solid line position in FIG. Concatenate to maintain.

As a result, the upper flat presser foot 44, 45 is always maintained at a position elevated from the cloth support plate 38, as shown in FIG.

In FIG. 3, two support pieces 69 and 70 are installed on the sewing machine bed below the feed cam 11, and one support piece 69 has an engagement piece T that engages with the lower surface of one end of the swing link 29.
An elastic acting force (not shown) in a clockwise direction so that one end of the swinging piece 72 to which the swing link 1 is fixed can be rotated by a step screw 78, and the engaging piece 71 is always in pressure contact with the lower end surface of the swing link 29.
The other supporting piece 7 is provided at the other end of the swinging piece 72.
an engaging edge 7 that is movable laterally (left and right in FIG. 3) and that engages the locking piece 14 of the transmission lever 15 at one end;
4 and the other end of an engaging body 76 provided with a fitting piece 75 projecting downward are rotatably connected.

Furthermore, a fitting hole 77 for fitting the fitting piece 75 of the engaging body 76 is formed at one end on the sewing machine bed, and a locking piece 78 facing the lower end of the other end of the transmission lever is formed at the other end. The formed sliding body 79 is arranged so as to be slidable in the lateral direction by means of stepped screws 80.

Further, on one side of the rear end of the presser arm 40 located behind the axis of the guide shaft 32, which is the center of horizontal swing of the board 9, a driven piece has a vertical plane that intersects the guide groove 9a of the board 9. 81 is fixedly arranged, and the board 9 is placed on the sewing machine bed surface near the rear end of the presser arm 40 at its final swinging position, that is, when the cycle sewing is completed and the board 9 is stopped (solid line position in FIG. 7). An electromagnet 83 is fixedly arranged so that the armature 82 protrudes opposite to the plane of the driven piece 81 and perpendicular to the plane.

Furthermore, as shown in FIG. 3, a first switch SW1 is disposed above the rear end of the side surface of the machine frame, and the feed cam 11 is engaged with the first switch SW2 during cycle sewing. an engaging piece 84 that closes the contact
is fixedly arranged, and the roller 13a of the control lever 13 is positioned close to the engaging portion 13b of the control lever 13 to engage the control cam 12.
The second switch SW2 is arranged so that the contact point is closed by the engaging portion 13b when the second switch SW2 is fitted into the recess 12a.

When the contact of the second switch SW2 is closed, the electromagnets 30 and 83 are excited for a predetermined time via a delay circuit (not shown), and the armature 30a of the electromagnet 30 is
is attracted downward, and the armature 82 of the electromagnet 83 protrudes.

The present invention has the above configuration, and its operation will be explained next.

When the sewing machine is stopped, as shown in FIG. 3, the roller 13a provided at one end of the control lever 13 fits into the recess 12a of the control cam 12, and its engaging portion 13K closes the contact of the second switch SW2. , the electromagnet 30 is energized and the chain 31
The roller 28 at one end of the swing link 29 is connected to the feed cam 1 via
The swing link 29 is pulled so that it is located at the starting end 10a of the guide groove 10 of No. 1, the armature 82 of the electromagnet 83 protrudes, and the base plate 9, that is, the cloth support plate 38 and the upper and lower insert feet 44
．． 45 is located at the solid line position in FIG. 2 (the two-dot chain line position in FIG. 7), which is the starting position.

Also, an engagement piece 7 that engages with the lower surface of one end of the swing link 29
1 is pushed down against the clockwise acting force of the rocking piece 72, and as a result, as shown in FIG. Piece 14
The locking piece 7 of the sliding body 79 is located outside the path of the bent end portion of the
8 faces a stepped portion 15a at the lower end edge of the transmission lever 15.

Furthermore, as described above, the clockwise acting force of the spring 23 on the operating lever 21 causes the operating lever 67 to be in the solid line state in FIG. Since they are aligned, the upper and lower inserting feet 44 and 45 are elevated from the cloth support plate 38.

Therefore, the cloth feeding mechanism 3 pushes the 7JC1 work cloth W between the flat presser foot 44 and the cloth support plate 38, and the foot pedal 25
When the lever is slightly depressed, the actuating lever 21 is activated via the chain 26.
rotates slightly counterclockwise, which releases the traction on the operating lever 67 via the chain 68, and the operating lever 67
The pulley rotates around the stepped screw 65 to the position indicated by the chain double-dashed line by the force exerted by the spring 66, and the engagement between the locking body 64 and the pawl body 62 is disengaged, and the pulley idling on the intermittent shaft 61 is rotated. The rotation is transmitted to the intermittent shaft 61, and the intermittent shaft 61
2, and after half a rotation, the claw body 62 engages the locking body 6.
3, the transmission is interrupted, and the intermittent shaft 61 rotates half a rotation and then stops.

1 This half rotation of the intermittent shaft 61 causes the connecting plate 59 to move to the left (
(Fig. 3), and the lifting plate 5
8 rises.

Therefore, the pushing down of the pressing shaft 53 by the lifting plate 58 is released, and the pressing plates 51, 51 are rotated counterclockwise) (FIG. 3) by the spring 50, and the upper and lower plates 41, 42 are lowered and flattened. The presser foot 44 descends onto the workpiece cloth W and the cloth support plate 3
After the workpiece cloth W is clamped between the upper presser foot 45 and the flat presser foot 44 (see B in FIG. 5), the upper presser foot 45 overlaps the flat presser foot 44, and the tip of the dowel 46 provided on the lower surface of the upper presser foot 45 is attached to the bottom. Round hole 44 of presser foot 44
The workpiece cloth W is pierced through b to prevent the workpiece cloth from shifting.

Further, due to the rotation of the operating lever 21, the transmission lever 15 is slightly rotated clockwise via the connecting rod 24 around the step screw 16, and the step screw connecting the transmission lever 15 and the connection link 18 is rotated slightly. It comes to be joined to the lower end of the circular relaxation hole 13C of the step force control lever 13 of No. 19.

Therefore, when the foot pedal 25 is further depressed, the actuating lever 21 is further rotated clockwise, the transmission lever 15 is further rotated clockwise via the connecting rod 24, and the stepped portion of the step screw 19 causes the control lever to The lower end of the circular arc hole 13c of the control cam 13 is pushed down, and the control lever 13 is rotated clockwise against the counterclockwise acting force, and the roller 13a provided at one end of the control lever 13 is pulled out from the recess 12a of the control cam 12. put out.

On the other hand, due to the movement of the transmission lever 15, the connecting link 1
8 and the horizontal link 17, the cutoff lever 7 rotates counterclockwise, and the rotation of the pulley 5, which is idling on the main shaft, is transmitted to the main shaft, and the sewing machine is driven.

The camshaft 8 rotates counterclockwise (FIG. 3) in conjunction with the rotation of the main shaft, and the feed cam 11 and control cam 12 rotate in the same direction.

If the foot pedal 25 is released after the control cam 13 has rotated, the roller 13a of the control lever 13 or the control cam 1
2, the control lever 13 is locked in the rotational position, and the transmission lever 15 is also locked in the rotational position, and the cutoff lever 7 is also rotated in the counterclockwise direction. maintained in a stable condition.

Further, by rotating the control lever 13, the engaging portion 1
3b separates from the contact of the second switch SW2, and the electromagnet 30
and 83 become inoperative, the suction maintenance of the swing link 29 is released, the roller 28 is guided by the guide groove 10 of the feed cam 11, the swing link 29 swings around the support shaft 27, and the electromagnet 83 The armature 82 is retracted into the electromagnet 83 by an elastic force.

Then, due to the swinging of the swinging link 29, the guide shaft 32 swings about its vertical axis via the connecting link 33, and the board 9
is swung left and right.

In this embodiment, the base plate 9 is swung from the starting position shown by the two-dot chain line in FIG. The cam groove 39 moves while being guided by the guide body 87 of the sewing machine bed, and the circular arc movement of the cloth support plate 38 due to the swinging of the board 9 about the axis of the guide shaft 32 causes the linear cam groove 39 to move as shown in the guide body 87 of the sewing machine bed. This is canceled out by the back and forth movement of the substrate 9 as it moves along the guide body 37, and therefore the cam groove 39 and Straight seams of the same length can be formed.

While the sewing machine is running, as the swing link 29 swings counterclockwise about the support shaft 27 while being guided by the guide groove 10 of the feed cam 11, the swing link 7
2 is rotated clockwise by the acting force, and as a result, the engaging body 76 moves to the left, and its engaging edge 74 moves below the bent portion at the tip of the locking piece 14 of the transmission lever 15. The sliding body 79 moves to the left via the fitting piece 75, and the locking piece 78 is opposed to the stepped portion 15a on the lower edge of the other end of the transmission lever 15, as shown by the two-dot chain line in FIG. position to a position facing the lower edge of the base.

Therefore, when the camshaft 8 rotates once, the roller 13a of the control lever 13 returns to the original position in the recess 1 of the control cam 12.
2a, the control lever 13 rotates counterclockwise around the stepped screw 16, and the pressing down of the stepped portion of the stepped screw 19 by the circular arc hole 13c is released, and the transmission lever 1
5 also rotates counterclockwise around the step screw 16, and as a result, the cutoff lever 7 returns to rotation in the clockwise direction via the connecting link 18 and the horizontal link 17, and the movement between the pulley 5 and the main shaft is stopped. The main shaft stops after rotating through a certain angle of inertia.

The rotation of the transmission lever 15 in the counterclockwise direction is performed at a position where the bent end portion of the locking piece 14 at one end abuts against the engagement edge 74 of the engagement body 76, as shown in FIG. is locked in
In this state, the stepped portion of the step screw 19 of the transmission lever 15 is engaged with the lower end of the circular arc hole 13c of the control lever 13, and the upper and lower insert feet 44 and 45 remain lowered onto the cloth support plate 38. It is.

Further, when the control lever 13 returns to rotation, the contact point of the second switch SW2 is closed by the engaging portion 13b (
At this time, the main shaft is rotating due to inertial force), so that the electromagnets 30 and 83 are rotated after a predetermined time via a delay circuit.
is excited (at this time, the inertial rotation of the main shaft is stopped and the rollers 28 of the swing link 29 are located at the end 10b of the guide groove 10), the armature 30a is attracted, and the swing link 29 is moved clockwise. The roller 28 is rotated and passes from the terminal end 10b of the guide groove 10 through the return passage 10c to the starting end 10.
a, and via the connecting link 33 and the guide shaft 32, the board 9 returns to the starting position shown by the two-dot chain line in FIG.

At the beginning of the return rotation of the swing link 29, the armature 82 protrudes due to the excitation of the electromagnet 83.
pushes out the driven piece 81 of the presser arm 40 located at the opposing position, thereby applying a rotational force to the board 9 in the clockwise direction in FIG. 7 about the axis of the guide shaft 32.

The rotational force of the substrate 9 by the electromagnet 83 is applied to the electromagnet 3.
When the base plate 9 returns from the stop position shown by the solid line in FIG. 7 to the start position shown by the two-dot chain line by the above-mentioned return rotation of the swing link 29 by 0, it assists in smooth movement. It is.

That is, due to the return of the swing link 29, the connection link 33
The board 9 returns to the starting position via the guide shaft 32, but the mounting resistance of the connecting parts from the swing link 29 to the board 9 and the sliding resistance between the board 9 and the bed surface. At the beginning of the return rotation of the swing link 29, it is necessary to return the swing link 29 with a large force, but at the beginning of the rotation, the armature 82 of the electromagnet 83 applies a return force to the board 9 in the direction of the starting position. By applying this force, the swing link 29 can be moved back with a small force, and the board 9 can be moved back smoothly and quickly.

The return rotation of the swing link 29 causes the swing piece 72 to rotate counterclockwise via the engagement piece 71, and the engagement body 76 moves to the right, so that the engagement edge 74 thereof is shown in FIG. As shown in FIG.
is rotated counterclockwise by the rotational force of the actuating lever 21 until the stepped portion of the stepped screw 19 at the other end joins with the upper end of the circular arc hole 13c of the control lever 13, and the actuating lever 21 is also rotated by the spring 2.
Due to the acting force of step 3, it rotates back clockwise (Fig. 4) to the solid line position.

Therefore, the operating lever 67 is rotated clockwise through the chain 68 against the spring 66, and returns to the solid line state again, and as described above, the elevating plate 58 is lowered and the upper presser foot 44°45
rises from the cloth support plate 38.

Further, as the engaging body 76 moves to the right, the sliding body 79 moves to the right via its fitting piece 75, and its locking piece 78 moves to a position facing the stepped portion 15a of the transmission lever 15. do.

Note that if the electromagnet 30 or the second switch SW2 fails and the swing link 29 cannot be rotated back, the locking piece 78 of the sliding body 79 will disengage from the transmission lever 15, as shown in FIG. 1 of the sewing machine 2, and even if the foot pedal 25 is depressed in this state, its clockwise rotation is prevented by the transmission lever 15 or the locking piece 78. Driving becomes impossible.

Next, a control device for emergency stop of the sewing machine will be explained with reference to FIG.

In the figure, F is a flip-flop circuit, O8 is a one-shot multi-circuit, TR is a transistor, P is a photocoupler, M is a driving motor, S is an electromagnetic switch for controlling the driving and stopping of the driving motor, and IR is a power switch. ONL is a reset signal for resetting the above-mentioned flip-flop circuit.

In the description of this control device, when the input/output voltage of each part is higher than a predetermined voltage, it is assumed to be a 1 signal, and when it is a low voltage, it is assumed to be a 0 signal.

Further, the one-shot multi-circuit O8 always outputs the O signal, but when the input signal changes from 1 to O, it outputs the 1 signal for a set time; When the contact point of the first switch SW1 disposed on the side of the machine frame is closed by the engagement piece 84 of the feed cam 11 during cycle sewing, the second switch SW
The time required for the second contact to close is set slightly longer.

First, when the power switch is turned on, each of the flip-flop circuits Fl and F2 is reset, which turns on the transistor TR, closes the electromagnetic switch S, and drives the drive motor M.

When the sewing machine is driven by depressing the foot pedal 25 and cycle sewing is started, the contact of the first switch SW1 is closed by the engagement piece 84 of the feed cam 11 during the cycle sewing, and the flip-flop The one-shot multi-circuit F1 is set, the input signal of the one-shot multi-circuit O8 changes from 1 to 0, and a 1 signal is output for the set time.

When the control lever 13 returns to rotation upon completion of the cycle sewing, the second switch S is activated by the engaging portion 13b of the control lever 13.
When the contact W2 is closed, the flip-flop circuit F1 is reset, and immediately thereafter the output signal from the one-shot multicircuit O8 changes from 1 to 0.

In this case, the flip-flop circuit F2 remains reset, the drive motor M continues to rotate, and the sewing machine 2
When the control lever 13 returns, the interlock between the pulley 5 and the main shaft is cut off and the pulley 5 is stopped, but the pulley 5 is interlocked with the drive motor M and idles on the main shaft.

Therefore, if the operator mistakenly continues to work while depressing the foot pedal 25, the control lever 13 will not be able to return even if the cycle sewing of the predetermined number of stitches is completed, and therefore the second switch SW2 Since the contact is not closed, the flip-flop circuit F1 remains set, and in this state, when the output signal from the one-shot multi-circuit O8 changes from 1 to 0, a signal is output from the NAND circuit NAND1 and the flip-flop circuit F1 remains set. The pull circuit F2 is set,
As a result, the transistor TR is turned off, the contact of the electromagnetic switch S is opened, and the driving of the drive motor M is stopped.

In addition, when the drive motor M is stopped in this way and when it is to be driven again, first, the control lever 13 is returned to its original position and the contact point of the second switch SW2 is closed.
If the flip-flop circuit F1 is reset and the normally closed contact of the third switch SW2 is opened, the O signal is output from the NAND circuit NAND2 and the flip-flop circuit F2 is reset.

As described above, the present invention includes a start/stop means that drives a sewing machine by a movement operation in one direction and returns to the movement after forming a predetermined number of stitches to stop the sewing machine; A feed cam with one or more guide parts whose starting and ending ends are located at different distances from the center of rotation, and a guide part of the feed cam that extends from the starting end to the ending end between the start and stop of the sewing machine. A rocking body that is guided and swings around a fixed axis holds the workpiece in the sewing area of the sewing machine, and in conjunction with the rocking of the rocking body, the first stitch and the last stitch are different on the workpiece. In a cycle stitch sewing machine equipped with cloth holding means that slides on the sewing machine bed surface so that the needle drops into position, when the sewing machine is stopped, the oscillating body is returned to a position corresponding to the starting end of the guide section and the ending end. A return means that operates to move to a position corresponding to the starting end of another guide part, and a return force that operates almost simultaneously with the operation of the return means to apply a restoring force to the cloth holding means in the direction of the original position at the beginning of the return of the oscillator. By providing the extrusion means, conventionally, in the early stage of the latter stage of the rocking body due to the return means, due to the sliding resistance of the connecting part between the rocking body and the cloth clamping means, the sliding resistance between the cloth clamping means and the bed surface, etc. However, according to the present invention, at the beginning of the return of the oscillator, the extrusion means causes the cloth clamping means to return the oscillator to the original position, that is, from the stop position to the start position. Since force is applied, the cloth holding means can be returned smoothly and quickly, and the swinging body can be returned with a small amount of force.

In particular, when the return means is taken over by an electromagnet, air cylinder, etc., the capacity of the electromagnet, etc. can be reduced, so when it is assembled into a sewing machine, etc., it can be easily assembled without taking up space. In addition, there are effects such as being able to prevent waste of power due to increasing the capacity of the electromagnet.

In the above embodiment, one guide groove 10 is provided in the feed cam 11 so that the starting end 10a and the ending end 10b of the guide groove 10 are connected to the feeding cam 1.
The starting end and the ending end are connected to each other by a return path 10c, and the recycle sewing is completed by one rotation of the feed cam 11. , the swing link 29 is returned to the position corresponding to the starting end 10a from the terminal end 10b upon completion of the cycle sewing. As shown in FIG. 10, two guide grooves A and B are formed such that their starting and ending ends are located at different distances from the center of rotation of the feed cam 11, and the starting and ending ends of one of the guide grooves A and B are located at different distances from the rotation center of the feed cam 11. The same result as in the above embodiment can be achieved even if the recycle stitching is completed by making half a rotation of the feed cam 11 by connecting the terminal end and the starting end of the other guide groove B through the return grooves C and D, respectively. Effects can be obtained.

Further, in the above embodiment, the workpiece cloth is held between the upper flat presser foot 44° 45 and the cloth support plate 38, but the upper flat presser foot 44° 45 is directly It is also possible to form a predetermined stitch by pressing the work cloth onto the bed surface of the sewing machine and causing the cloth to be worked to slide on the bed surface.

Furthermore, in the above embodiment, the cutoff lever 7 is driven counterclockwise, that is, the sewing machine is driven via the chain 26 etc. by stepping on the foot pedal 25. It may be implemented in such a way that the contacts of the switch are closed by an operation such as depressing the switch 25, and the electromagnet excited thereby attracts the chain 26 etc. and rotates the cutoff lever 7.

Furthermore, in the above embodiment, the rotation of the pulley 5 is transmitted to the main shaft via the clutch mechanism and the cutoff is controlled by rotating the cutoff lever 7, which is rotatably arranged around an axis parallel to the main shaft. What was implemented on a cycle stitch sewing machine is shown, but for example,
As shown in the publication, a driving pulley and an idle pulley are arranged at the rear end of the sewing machine to place the belt on the main shaft via a belt shifter by rotating a cutoff lever that can be rotated around an axis perpendicular to the main shaft. The present invention may be implemented in a cycle sewing machine in which the main shaft and the driving motor are interlocked and disconnected by changing the hooks as appropriate.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of the suturing device, Fig. 2 is its top view, Fig. 3 is a right side view of the sewing machine, Fig. 4 is a rear end view of the suturing device centering on the sewing machine, and Fig. 5 is a top view of the suturing device. An enlarged sectional view taken along the line ■-■ in FIG. 3, and FIG. 6 an exploded perspective view of the cloth holding means.
FIG. 7 is a top view of the sewing machine bed, FIG. 8 is a control circuit diagram for emergency stop of the sewing machine, and FIG. 9 corresponds to FIG. 3.
A right side view showing only the step end of the sewing machine, and FIG. 10 a front view of a feed cam showing another embodiment. Starting/stopping means...7, 13, Feed cam...11, Feed cam guide portion...10, Locking means...12, Rocking body...29, Cloth clamping means...9, 38, 44, 45
, return means...30, extrusion means...83, signal transmission means...SW2, blocking means...78.79°

Claims (1)

[Scope of Claims] 1. Start/stop means for driving the sewing machine by moving in one direction, moving back to form 1 for a predetermined number of stitches, and stopping the sewing machine; The feed cam has one or more guide parts whose starting and ending ends are located at different distances from the center of rotation in the rotation plane of the sewing machine, and the guide part of the feed cam is used to move the sewing machine from the starting end to the sewing machine from the start to the stop. A rocking body that is guided all the way to the end and swings around a fixed axis, and an original position corresponding to the starting end of the guide section that holds the material to be sewn in the sewing area of the sewing machine and is linked to the rocking of the rocking body. cloth holding means that slides on the sewing machine bed surface to a position apart from the original position corresponding to the terminal end; a return means that operates to move the cloth to a position corresponding to the starting end of the guide; and a push-out means that operates when the sewing machine is stopped and applies a restoring force to the cloth holding means in the direction of the original position at the beginning of the return of the oscillator. A cycle stitch sewing machine equipped with , and.