JPS5847194B2 - Safety device for 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. A clamping means for forming a stitch on a workpiece by moving so that the position is different from the stop position when the stitch formation is completed, and the first stitch and the last stitch are at different positions; and the clamping means is moved from the stop position to the start position. In the above-mentioned sewing machine, the above-mentioned sewing machine is provided with a blocking means that disables starting operation of the sewing machine when the clamping means is in the above-mentioned stop position and enables starting operation of the sewing machine when it is in the starting position, The present invention relates to a safety device that prevents a worker from starting a starting operation when a clamping means does not return from a stopped position due to a failure or the like.

Below, an embodiment of the present invention will be described with reference to the drawings. On the support base 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. Place 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 of all, as shown in Fig. 3.4, this sewing machine 2 has a drive pulley which is always rotated by a drive motor (not shown) via a belt 4 on a main shaft (not shown) protruding from the rear end surface. 5 is transferred to the main shaft by rotating a cutoff lever T rotatably mounted on a fixed shaft 6 on the rear end surface of the sewing machine in a counterclockwise direction 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 counterclockwise at a reduced speed in conjunction with the main shaft. 8 has a guide groove 10 for controlling the horizontal movement of a board 9, which is shaped like a disc and is slidably installed on the bed of the sewing machine, so that its starting position and stopping position are different. Its starting point I
The cutoff lever 1 is formed so as to gradually approach the axis of the camshaft 8 from Qa to the terminal end 10b, and the cutoff lever 1 is placed on the outer peripheral surface of the feed cam 11 whose ends are communicated through a return groove 10c. A recess 12a is formed for controlling the cut-off lever 7 by the outer periphery (position shown in solid line in FIG. 4).
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 11 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 arranged 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 28 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 ring 29 is swingably supported, and an electromagnet 30 is disposed in the sewing machine bed below, and the armchair 30a and one end of the swing link 29 are connected by a chain 31.
Connect by.

In addition, the thin bed has a guide shaft provided at its upper end with a track groove (not shown) that fits into the longitudinal guide hole 9a (Fig. 6) provided in the substrate 9 and guides the substrate 9 in the longitudinal direction. 82 is installed to be swingable about a vertical axis, and the 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, 1, a guide body 31 having a needle hole 36 formed in the center thereof through which the needle 35 of the needle bar 34 passes is formed in the sewing machine suture section of the sewing machine bed in a cylindrical shape protruding from above the bed surface. Further, a cloth support plate 38 that supports the cloth at the sewing machine sewing part is fixed to the tip of the substrate 9, and this cloth support plate 3
8 is formed with a cam groove 39 which is linear in the left-right direction and loosely fits into the outer periphery of the guide body 31.

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 shaped 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 flat presser 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 the front and rear sides of the needle hole 44a is fixed, and the other upper and lower plates 42 are fixed.
At the lower end of the presser foot 45, an upper presser foot 45, which has the same flat rectangular shape as the flat presser foot 44 and has a needle hole 45a corresponding to the needle hole 44a, is placed above the flat presser foot 44. The lower surface of the upper presser foot 45 has round holes 4 at positions corresponding to the round holes 44b of the flat presser foot 44 before and after the needle drop hole 45a when the upper presser foot 44 and 45 overlap.
A large number of needles 46 are fixedly arranged and protrude slightly from the lower surface of the flat presser 44 through 4b.

Further, the upper and lower plates 41 located within the support frame 43 are provided with long holes 47 in the vertical direction, so that when the respective presser feet 44 and 45 are overlapped (state A in FIG. 5), the lower ends of the upper and lower plates have the above-mentioned length. Hole 4
A short hole 48 corresponding to 1 is formed, and on both sides of the tip of the presser arm 40, it is rotatably supported by step screws 49 (only one shown), and is always rotated counterclockwise by a spring 50 (only one shown). (Fig. 8)
．． 51 is inserted into the long hole 47 and the short hole 48 through a hole (not shown) provided in the rear end surface of the support frame 43, and the acting force causes each upper and lower plate 41, 42 to always move downward. It gives the power of action to.

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 suppression plate 51 of the rotating body 54 is connected by a link 55 to the clockwise rotation of the rotating body 54. 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' is 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 (7!). do.

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 suppressing 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 the T, and the right end of the connecting plate 59 is linked to a presser foot control mechanism 60 (not shown) installed on the rear end surface of the sewing machine frame. 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, which will be described later. The flat presser foot 4 on the upper axis
4.45 is moved up and down with respect to the upper surface of the cloth support plate 38, and the intermediate portion is rotatably supported on the rear end surface of the machine frame by a step screw 65, and the claw body 62 is held at one end. They are opposed to each other, and when one enters the engagement position with the claw body 62, the other is located in the disengaged position, and the engagement with the claw body 62 interrupts the interlocking movement between the pulley and the intermittent shaft 61. The engaging body 63 is always rotated in a counterclockwise direction by a spring 66 whose acting force is weaker than that of the spring 23 which applies a clockwise rotational force to the operating lever 21. When the claw body 62 is engaged (as shown by the two-dot chain line in FIG. 4) and the rotational transmission of the pulley to the intermittent shaft 61 is interrupted, the connecting plate 59 stops at the left position, and at this time the elevating plate 58 The lower edge of is located at a position leaving a constant distance from the suppression axis 53.

Further, when the operating lever 61 is rotated clockwise, the engagement between the locking body 63 and the claw body 62 is released, and the intermittent shaft 61 and the pulley are thereby 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. Each hook-shaped link 5T rotates counterclockwise to lower the elevating plate 58, and as a result of this lowering, its lower edge pushes up the pressing shaft 53 and rotates the rotating body 54 clockwise, and at the same time, the horizontal shaft 5
The connecting body 56 also rotates through the links 55 and 55', and the suppressing plates 51 and 51' rotate clockwise through the links 55 and 55', respectively, and are inserted into the long holes 47 and short holes 48 of the upper and lower plates 41 and 42, respectively. The tips of the respective upper and lower plates 42 that are engaged with the upper and lower plates 42 rise, and the upper ends of the short holes 48 of the upper and lower plates 42 of the other side are connected to the long holes 4 of the other upper and lower plates 41.
After rising until it matches the upper end of γ (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, a chain 68 loosely passing through the support base 1 connects the other end of the clamping lever 67 and the other end of the operating lever 21, so that the spring 2
3, the bar 61 is operated by the clockwise rotational force of the operating lever 21 against the action force of the spring 66 to the solid line position in FIG. Connect to maintain traction.

As a result, the upper and lower inserting feet 44, 45 are 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 1 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 12 to which the swinging link 1 is fixed can be rotated by the step screw 13, and the engaging piece 11 is always in pressure contact with the lower end surface of the swinging link 29.
The other end of the swinging piece 12 is provided with the other support piece 1.
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 15 projecting downward are rotatably connected.

Furthermore, a fitting hole 7γ for fitting the fitting piece 15 of the engaging body γ6 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 19 is arranged so as to be slidable in the lateral direction by means of stepped screws 80.

Further, on one side surface of the rear end of the presser arm 40 located behind the axis of the guide shaft 32, which is the center of the horizontal swing of the board 9, the driven arm 40 has a vertical lower groove that intersects the guide groove 9a of the board 9. The piece 81 is fixedly placed on the sewing machine bed surface close to the rear end of the presser arm 40, and the board 9 is placed in its final position of swing, that is, stopped when cycle sewing is completed (solid line position in Fig. 1). At this time, the 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, the first switch SW1 is arranged at the rear end of the side of the machine frame, at the upper part, and
An engaging piece 3 is provided on the outer periphery of the feed cam 11 and engages with the first switch SW2 during cycle sewing to close the contact point.
4 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.
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 four parts 12a of the second switch SW2.

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.

This invention takes advantage of the above, 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. 1), 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 12, and as a result, as shown in FIG. Stop piece 14
The locking piece 1 of the sliding body 19 is located outside the path of the bent portion at the tip.
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 state shown in the solid line in FIG. Therefore, the upper and lower inserting feet 44 and 45 are elevated from the cloth support plate 38.

Therefore, when the cloth feed mechanism 8 pushes the workpiece cloth W between the flat presser foot 44 and the cloth support plate 38 and the foot pedal 25 is slightly depressed, the operating lever 21 is moved slightly counterclockwise via the chain 26. As a result, the traction of the operating lever 67 is released via the chain 68, and the operating lever 67 is rotated around the stepped screw 65 to the position indicated by the chain double-dashed line by the force exerted by the spring 66, and its locking member is rotated. 64 is disengaged from the pawl body 62, the rotation of the pulley idling on the intermittent shaft 61 is transmitted to the intermittent shaft 61, and the intermittent shaft 61 rotates together with the pawl body 62, and after half a rotation, the pawl rotates. The part body 62 engages with the locking body 63 to cut off the transmission, and the intermittent shaft 61 rotates half a rotation and then stops.

This half rotation of the intermittent shaft 61 moves the connecting plate 59 to the left (FIG. 3), and the lifting plate 58 moves via the hook-shaped link 57.
rises.

Therefore, the pressing down of the pressing shaft 53 by the lifting plate 58 is released, and the pressing plates si, si are rotated counterclockwise (FIG. 3) by the spring 50, and the upper and lower plates 4T', 42 are lowered. After the flat presser foot 44 descends onto the workpiece cloth W and clamps the workpiece cloth W between it and the cloth support plate 38 (B in FIG. 5), the upper presser foot 45 is superimposed on the flat presser foot 44. and upper presser foot 45
The tip of each needle 46 provided on the lower surface of the presser foot 44
4b to pierce the workpiece cloth W to prevent the workpiece cloth from shifting.

Further, due to the above-mentioned rotation of the operating lever 21, the transmission lever 15 is rotated slightly clockwise via the connecting rod 24 around the stepped screw 16, and the stepped screw 19 connecting the transmission lever 15 and the connecting link 18 is rotated slightly. Step part or circular hole 1 of control lever 13
It will be joined to the lower end of 3C.

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

On the other hand, due to the rotation of the transmission lever 15, the connecting link 1
The cutoff lever 7 is rotated counterclockwise via the horizontal link 8 and the horizontal link 1γ, and the rotation of the pulley 5, which is rotating idly 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.

After the control cam 13 has rotated, if the foot pedal 25 is released, the roller 13a of the control lever 13 will move to 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 1 is also rotated in the counterclockwise direction. maintained in the same state.

Also, by rotating the control lever 13, the engaging portion'
18b separates from the contact of the second switch SW2, and the electromagnet 3
0 and 83 become inoperable, the suction maintenance of the swing link 29 is released, and the roller 28 moves into the guide groove 10 of the feed cam 11.
The swing link 29 is guided by the swing link 29 to swing around the support shaft 27, and the armature 82 of the electromagnet 83 is retracted into the electromagnet 83 by the elastic acting 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 31 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 31 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 T
2 is rotated clockwise by the acting force, and as a result, the engaging body 16 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 engages with 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. Move from the facing position to the facing position with the lower edge of the base.

Therefore, when the camshaft 8 rotates once, the recess 1 of the control cam 12 returns to its original position.
2a, the control lever 13 rotates counterclockwise around the stepped screw 16, and the pressing down of the stepped portion of the screw 19 by the circular arc hole 13c is released, and the transmission lever 15
The lever 7 rotates counterclockwise around the step screw 16, and 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 interrupted. , 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 the engagement edge T4 of the engagement body 16, as shown in FIG. 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 are connected to the cloth support plate 38. It remains down.

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 is located at the roller 28 of the swing link 29 or the terminal end tab of the guide groove 10), the armature 30a is attracted, and the swing link 29 moves clockwise. The roller 28 is rotated and the guide groove 1
0 from the terminal end 10b through the return passage 10C to the starting end 10a.
The board 9 returns to the starting position indicated by the two-dot chain line in FIG. 7 via the connecting link 33 and the guide shaft 32.

At the beginning of the return rotation of the swing link 29, the armature 8 protrudes due to the excitation of the electromagnet 83.
2 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. 1 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. 1 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.

Due to the return rotation of the swing link 29, the swing piece γ2 rotates counterclockwise via the retaining piece 11, 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 step 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.
3, it rotates back clockwise (Fig. 4) to the solid line position.

Therefore, the operating lever 67 is rotated clockwise against the spring 66 via the chain 68, and returns to the solid line state again, and as described above, the elevating plate 58 is lowered and the upper and lower inserting feet 44.45
rises from the cloth support plate 38.

Further, as the engaging body 76 moves to the right, the stationary body 79 moves to the right via the fitting piece 15, and the locking piece 7
8 moves to a position facing the stepped portion 15a of the transmission lever 15.

Note that if the electromagnet 30 or the second sweetener SW2 fails and the swing link 29 cannot be rotated back, the locking piece 18 of the sliding body γ9 will disengage from the transmission lever 15, as shown in FIG. Even if the foot pedal 25 is depressed in this state, the transmission lever 15 is prevented from rotating clockwise by the locking piece 78, so that the sewing machine 2 is not driven. 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. This is a reset signal for resetting the flip-flop circuit when turned on.

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 a 0 signal, but when its input signal changes from 1 to O, it outputs a 1 signal for a set time; When the contact point of the first switch SW1 arranged on the side of the machine frame is closed by the engagement piece 84 of the feed cam 11 during cycle sewing, the return rotation of the collar control lever 13 causes the engagement 113b to close the second switch SW1.
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 input signal of the one-shot multi-circuit O8 changes from 1 to 0, and outputs 1 signal 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 of W2 is closed, the flip-flop circuit F1 is reset, and immediately after that, the above-mentioned one-shot multi-circuit O
The output signal from 8 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 O, 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, a 0 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 by swinging the rocking body, the first and last stitches are placed on the workpiece in accordance with the guide section. In a cycle stitch sewing machine equipped with cloth holding means that slides on the sewing machine bed surface so that the needles drop into different positions, the oscillator is moved to a corresponding position from the end of the guide section to the start end when the sewing machine is stopped. A return means that operates to return to a position corresponding to the starting end of another guide part, and a starting/stopping means that operates in one direction when the rocking body is in a position corresponding to the starting end of another guide part. By providing a blocking means that disables the moving operation when it is in a position corresponding to the end, it is possible to automatically return the cloth holding means to the starting position at the same time as seam formation is completed. Therefore, it has excellent operability, and if the oscillating body does not return due to a failure of the return means, it will be impossible to start the sewing machine, so the sewing machine will not be started when the oscillating body is located at the end of the guide section. In cases where the end wall of the guide section collides with the oscillating body, the oscillating body is damaged, and the worker is prevented from being seriously injured by flying debris due to the damage, thereby increasing safety. It has excellent effects.

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.
1 to be located at different distances from the center of rotation of the feed cam 11, and communicate the starting end and the ending end through a return path 10c, so that the recycle stitching is completed by one rotation of the feed cam 11, and Although 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, a plurality of guide grooves, for example, a tenth As shown in the figure, two guide grooves A and B are formed such that their starting ends and ending ends are located at different distances from the rotation center of the feed cam 11, and the starting end and ending end of one guide groove A are Even if the return grooves C and D are connected to the end and start end of the other guide groove B so that recycle stitching can be completed by half a rotation of the feed cam 11, the same effect as in the above embodiment can be obtained. can get.

Further, in the above embodiment, the fabric to be processed is held between the upper and lower inserting feet 44° 45 and the cloth support plate 38, but the upper and lower inserting feet 44° 45 are not directly connected to each other. The fabric to be processed may be pressed onto the bed surface of the sewing machine, and a predetermined stitch may be formed while the fabric to be processed slides on the bed surface.

Furthermore, in the above embodiment, the cutoff lever T is driven counterclockwise, that is, the sewing machine is driven via the chain 26 etc. by pressing the foot pedal 25, but when the operator presses the foot pedal 25, The contact of the switch may be closed by an operation such as depressing the pedal 25, and the electromagnet excited thereby attracts the chain 26 etc. and rotates the cutoff lever 1.

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, the invention was implemented in a cycle stitch sewing machine in which the main shaft and the drive motor are interlocked and disconnected by appropriately changing the hooks on the driving pulley and idle pulley arranged on the main shaft at the rear end of the sewing machine. You may.

[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 ■-v in Fig. 3, Fig. 6 an exploded perspective view of the cloth holding means,
Fig. 1 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.
FIG. 10 is a right side view showing only the rear end of the sewing machine, and a front view of a feed cam showing another embodiment.

Claims (1)

[Scope of Claims] 1. A start/stop means that drives the sewing machine by movement in one direction and returns to the movement after forming a predetermined number of stitches to stop the sewing machine; A feed cam that has one or more guide parts whose starting and ending ends are located at different distances from the center of rotation in its rotational plane; a rocking body that swings around a fixed axis, and a rocking body that clamps the workpiece within the sewing area of the sewing machine and, by the swinging of the rocking body, moves a first part onto the workpiece corresponding to the guide part. A cloth clamping means that slides on the sewing machine bed surface so that the stitch and the final stitch fall in different positions, and a signal that is arranged on the return path of the start and stop means and generates a return signal by engagement with the start and stop means. It has a generating means and an armature whose one end is connected to the free end of the oscillator, and is excited in response to a return signal from the signal generating means, and the armature is pulled by the electromagnetic force to move the oscillator from the end of the guide section to the start end. a return means for returning to a corresponding position; one end disposed in the moving path of the rocking body, receiving an elastic force in a direction opposite to the return direction of the rocking body, and the other end of the rocking body being connected to the starting end of the guide section; The oscillator is connected to the oscillator and the start/stop means so that when it is in a position corresponding to the end, it is located outside the unidirectional movement path of the start/stop means, and when it is in the position corresponding to the end, it is located within the unidirectional movement path of the start/stop means. means of prevention,
A safety device for cycle stitch sewing machines.