JP2003326033A - Sewing machine for blind stitching - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the vertical momentum from being reduced in an interlocking manner, even if the longitudinal momentum is reduced. <P>SOLUTION: A sewing machine for blind stitching is equipped with: a fabric feeding mechanism which moves a fabric feed dog 29a in a looped orbit by driving the feed dog 29a in vertical and longitudinal synchronization; vertical driving mechanism 1 for moving the feed dog 29a vertically; and a longitudinal driving mechanism 2 which is driven separately from the mechanism 1 so as to move the feed dog 29a longitudinally. The vertical momentum provided by the mechanism 1 is kept approximate constant, and the longitudinal momentum provided by the mechanism 2 is made variable. A longitudinal momentum adjusting mechanism 7 is provided so that the longitudinal momentum provided by the mechanism 2 can be adjusted between an advance side and a retreat side. A mechanism 8 for setting the longitudinal momentum at zero is provided so that the longitudinal momentum provided by the mechanism 2 can be instantaneously set at approximately zero. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rake stitch sewing machine capable of adjusting the feed amount of cloth feed teeth in the front-rear direction independently of the amount of vertical movement.

[0002]

2. Description of the Related Art As a cloth feed dog driving mechanism in a conventional sewn sewing machine, there is one in which one cam is rotated to drive the cloth feed tooth in the up-down direction and the front-rear direction to perform a loop-like motion ( Mitsuko Sho 55-46136
No.

[0003]

In the cloth feed dog drive mechanism in such a conventional rake stitch sewing machine, the vertical momentum and the longitudinal momentum are associated with each other corresponding to the shape of one cam. It is not possible to independently change the momentum ratio of. Therefore, when the momentum in the front-rear direction is reduced, the momentum in the up-down direction is also reduced, and the following problems may occur.

That is, since the amount of momentum in the front-rear direction is large in normal sewing work, the amount of momentum in the up-down direction is large and there is no hindrance to cloth feeding or sewing, but when it is desired to reduce the amount of momentum in the front-rear direction, for example, the end of rake sewing. In the case where the part is sewn, the momentum in the up-down direction also becomes small in association with the decrease in the momentum in the front-rear direction, which may hinder cloth feeding.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a rake stitch sewing machine in which the vertical momentum does not decrease in association with the decrease in the longitudinal momentum. .

[0006]

According to a first aspect of the present invention, there is provided a rake stitch sewing machine which drives a cloth feed dog synchronously in an up-down direction and a front-rear direction to move the cloth feed tooth with a loop-shaped locus. In a rake stitch sewing machine having a feed mechanism, a vertical drive mechanism for moving the cloth feed teeth in the vertical direction and a front-back direction drive mechanism driven separately from the vertical drive mechanism for moving the cloth feed teeth in the front-back direction. It is characterized by having and.

Thus, the momentum in the front-rear direction can be adjusted independently of the momentum in the up-down direction, and even if the momentum in the front-rear direction is reduced, the momentum in the up-down direction does not become small, and the cloth feeding and the sewing can be stably performed. It can be carried out.

The rake stitch sewing machine according to a second aspect of the present invention is characterized in that the vertical motion amount by the vertical drive mechanism is substantially constant and the front-back motion amount by the front-back direction drive mechanism is variable.

As a result, even if the momentum in the front-rear direction is reduced, the momentum in the up-down direction can be kept substantially constant, and cloth feeding and sewing can be stably performed.

A rake stitch sewing machine according to a third aspect of the present invention is provided with a longitudinal momentum adjusting mechanism capable of adjusting the longitudinal momentum by the longitudinal driving mechanism between the forward side and the backward side. To do.

Accordingly, the momentum in the front-rear direction can be adjusted independently between the forward side and the backward side according to the purpose of sewing.

A rake stitch sewing machine according to a fourth aspect of the present invention is characterized in that the momentum in the front-rear direction by the front-rear direction drive mechanism is
It is characterized in that it is provided with a front-back direction momentum zero setting mechanism for instantaneously setting it to approximately 0 or the backward side.

With this, only the momentum in the front-rear direction can be instantly made to be 0 or close to the retracted side at the time of fastening, and stable fastening can be performed. In addition, when the amount of momentum in the front-back direction is set to 0, the cloth feed tooth cloth may not move up and down in the vertical direction due to the characteristics of the mechanism, but the cloth may be slightly advanced in the forward direction. By setting to the backward side, it is possible to correct the cloth feed amount so as to go up and down in the vertical direction.

A rake stitch sewing machine according to a fifth aspect of the present invention comprises an arm member having a cloth feed tooth attached to a tip thereof, a vertical drive mechanism for vertically moving the arm member, and the vertical drive mechanism. And a front-rear drive mechanism that is separately driven to move the arm member in the front-rear direction. The front-rear drive mechanism includes a cam attached to a drive shaft that is rotationally driven, and the eccentric motion of the cam. The front-rear direction momentum conversion mechanism for converting into the front-rear direction motion, and the front-rear direction momentum by the front-rear direction momentum conversion mechanism can be adjusted to the forward side and the slightly backward side across the point where the front-rear direction motion is zero. Displacement adjusting mechanism and zero front-back direction momentum setting mechanism for instantaneously changing the forward / backward movement from the state in which the forward / backward movement is set by the displacement adjusting mechanism to almost zero or in the backward direction. And characterized in that it comprises a.

Thus, the longitudinal drive mechanism can be operated independently of the vertical drive mechanism, and the eccentric movement of the cam attached to the drive shaft is changed to the longitudinal movement of the arm member by the longitudinal momentum conversion mechanism. The longitudinal movement of the arm member is adjusted by the longitudinal momentum displacement adjusting mechanism. When the longitudinal momentum of the arm member is set to almost zero, the longitudinal movement zero setting mechanism is operated to move the longitudinal movement. Can be instantaneously set to almost 0 or to the retreat side, and, for example, tie-off stitching at the final stage in ordinary sewing can be stably performed.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A rake stitch sewing machine according to an embodiment of the present invention will be described below with reference to the drawings.

This rake stitch sewing machine is provided with a cloth feed mechanism which drives the cloth feed teeth in synchronism with each other in the vertical direction and the front-rear direction to move the cloth feed teeth in a loop-shaped locus. As shown in FIGS. 1 and 3, an arm member 3 having a cloth feed tooth attached to its tip, the vertical drive mechanism 1 for moving the arm member 3 in the vertical direction, and the arm member 3 for moving in the front-back direction. The front-back direction drive mechanism 2 is provided.

The first characteristic of the present rake stitch sewing machine is that the momentum in the longitudinal direction can be adjusted independently of the momentum in the vertical direction of the arm member 3. The second feature is that even if the momentum in the front-rear direction of the arm member 3 is reduced, the momentum in the up-down direction can be kept substantially constant. The third feature is that the longitudinal momentum of the arm member 3 can be independently adjusted between the forward side and the backward side according to the purpose of sewing, and the momentum of the arm member 3 in the longitudinal direction is set to 0. In this case, it is possible to correct the sewing machine needle so that it sticks at a right angle to the cloth. The fourth feature is that only the momentum in the front-rear direction of the arm member 3 can be instantly made close to 0 at the time of tie stitching.

As shown in FIG. 1, the front-rear drive mechanism 2 includes a cam 5 mounted on a drive shaft 4 which is rotationally driven.
And a forward-backward momentum conversion mechanism 6 for converting the eccentric movement of the cam 5 into a forward-backward movement of the arm member 3, and a point in which the forward-backward momentum of the forward-backward momentum conversion mechanism 6 becomes zero. The forward-backward momentum adjusting mechanism 7 that can be adjusted to the forward side and slightly backward side with the forward and backward directions and the forward-backward motion amount adjusting mechanism 7 setting the forward-backward motion to the forward side is almost zero or backward. And a zero momentum setting mechanism 8 in the front-rear direction.

As shown in FIGS. 1 and 8, the cam 5 is inserted into the drive shaft 4 and fixed by a set screw 5a. The cam 5 is inserted into a circular through hole 9a formed on the base end side of the swing rod 9, and the disc member 10 is provided on the end surface of the cam 5.
Is attached by a set screw 10a. An arm portion 9b extending outward from the base end side is formed on the swing rod 9, and a through hole 9c is formed on the tip end side of the arm portion 9b. A pin 13 is inserted into the through hole 9c and fixed by a set screw 9d.

The pin 13 is inserted into a through hole 11a formed near the end of the swing transmission lever 11, and inserted into a through hole 12a formed near the end of the swing amount adjusting lever 12. There is. As a result, the swing amount adjusting lever 12
The swing transmission lever 11 and the swing rod 9 are connected to each other by the pin 13.
Are integrally connected to.

A through hole 11 is provided at the other end of the swing transmission lever 11.
b is formed, and the pin 15 is inserted into the through hole 11b. The tip of the pin 15 is inserted into a through hole 16a formed in the connecting member 16 and integrated with the connecting member 16 by a set screw 16c. A through hole 16b with a slit is formed at the other end of the connecting member 16, and a shaft 18 is inserted into the through hole 16b. A fixing bolt 16d is screwed into the slit portion to integrate the shaft 18 and the connecting member 16 into one body. There is.

As shown in FIG. 9, the shaft support member 19
The fixing bolt 19a is screwed into the screw hole 19c, and the spring pin 19b is inserted into the through hole 19d so as to be fixed to the apparatus main body. The shaft 18 is rotatably inserted into two bearing portions 19e formed at the upper end of the shaft support member 19.

The end of the shaft 18 on the side opposite to the connecting member 16 side is inserted into a through hole 20a with a slit formed in the rocking lever 20, and a stop bolt 20d is attached to the slit.
The shaft 18 and the swing lever 20 are integrated by screwing. The swing lever 20 has a through hole 20a with a slit.
An arm portion 20e extending outward from the side is formed, and a through hole 20b is formed at a tip portion of the arm portion 20e.
A pin 22 is inserted into the through hole 20b and fixed by a set screw 20c. The pin 22 is inserted into a through hole 21 a formed at the tip of the horizontal rod 21 and is inserted into the horizontal rod 21.
Is sandwiched between the rocking lever 20 and the rocking lever 20.

A through hole 21b is formed at the other end of the horizontal rod 21, and a pin 23 is inserted into the through hole 21b. The pin 23 is inserted into a through hole formed at the tip of the auxiliary feed arm member 25 and a through hole formed at the tip of the arm member 3, and is fixed by a set screw 23a.

As shown in FIG. 3, a substantially rectangular through hole 3a is formed in the arm member 3, and a vertical drive cam 26 fixed near the tip of the drive shaft 4 is inserted into the through hole 3a. Has been done. A guide member 28 is swingably fixed to the main body of the apparatus by inserting a pin 27 into a through hole 28a with a slit formed therein and fixing it with a fixing bolt 27a. By inserting the pin 29 into the through hole 28b formed at the tip end of the guide member 28 and inserting the tip end of the pin 29 into the through hole formed in the arm member 3, the arm member 3 can swing. Has become. A groove 3b is formed at the tip of the arm member 3, and a feed dog member 29 having a cloth feed tooth 29a formed at the end is inserted into the groove 3b and fixed by a fixing bolt 29b.

As shown in FIGS. 1 and 3, the sub-feed arm member 25 is connected to the arm member 3 by the pin 23 as described above, and has the pin 35 attached to the tip of the sub-feed arm member 25. It is supported by inserting it between the bifurcated shafts 36 and inserting a square ball member. A fulcrum member 32 is swingably supported by inserting a pin 31 into a through hole formed in the arm member 3. A pin 33 is inserted into a through hole with a slit formed at the tip of the fulcrum member 32 and fixed by a fixing bolt 32a. This pin 33 is a sub-feed transmission rod 39
The auxiliary feed transmission rod 39 is inserted into a through hole formed at the tip of the auxiliary feed transmission rod 39 and is connected to the guide member 28 by a pin.
Further, the pin 33 is inserted into a through hole formed in the sub-feed support member 40, the sub-feed angle ball member 42 is inserted into the groove portion formed in the sub-feed support member 40, and the sub-feed tooth 41 is provided at the tip. It is installed.

As shown in FIG. 8, the swing amount adjusting lever 12
The through hole 12b formed at the end of the pin, the pin portion 46c formed at the end of the overhanging portion 46b of the swing adjusting crank 46.
Is inserted, the set screw 46d is screwed into the pin portion 46c from the opposite side through the washer 46e, and the swing amount adjusting lever 12 and the swing amount adjusting crank 46 are integrated. A shaft portion 46a is integrally formed at the base end portion of the overhanging portion 46b of the swing adjustment crank 46.

As shown in FIGS. 2 and 10, the shaft portion 46a is inserted into a through hole 47b penetrating an overhanging portion 47a formed in the lower portion of the crank support member 47 in the figure. The tip portion of the shaft portion 46a is inserted into the through hole 48a with a slit formed in the connecting member 48 with its tip protruding, and the fixing bolt 48b is screwed into the slit portion so that the shaft portion 46a and the connecting member 48 are separated from each other. It is integrated. A through hole 48d is formed in the connecting member 48, and a pin 50 is inserted into the through hole 48d and integrated with a set screw 48c. The shaft portion 46a
A collar 49 is inserted at the tip of the and is integrated by a set screw 49a. The collar 49 is formed with a spring hook portion 49b protruding outward.

The crank support member 47 is fixed to the apparatus main body by a spring pin 47e and a fixing bolt 47f. An overhanging portion 47c is formed in the upper portion of the crank support member 47 in the drawing, and a through hole 47d is formed in the overhanging portion 47c. A shaft 52 is inserted into the through hole 47d, and a worm wheel 53 is inserted at the right end of the shaft 52 in the figure and fixed by a set screw 53a. A disk member 54 is inserted at the left end of the shaft 52 in the figure and is fixed by a set screw 54a. Disk member 5
4, a through hole 54b is formed, and a pin 55 is inserted into the through hole 54b and integrated by a set screw 54c.

As shown in FIG. 7, the crank support member 47
A mounting plate 58 is fixed to the upper surface in the figure by a fixing bolt 58a. The cover plate 5 is provided on the upper surface of the mounting plate 58 in the figure.
9 is fixed by a set screw 59a. Cover plate 5
A notch 59b is formed in the plate 9, and a through hole 58b is formed in the mounting plate 58 corresponding to the notch 59b. A sleeve 62 is press-fitted into the through hole 58b, a shaft 60 is inserted into the through hole of the sleeve 62, an adjusting knob 61 is inserted near the upper end of the shaft 60 in the figure, and a set screw 61a is used. It is integrated. A spring 62a and a ball 62b for giving a click feeling to the adjusting knob 61 are attached to the sleeve 62. A scale plate 63 is fixed on the upper surface of the adjusting knob 61 to indicate the amount of adjustment by the adjusting knob 61. A thrust bearing 66 and a worm 65 are inserted on the lower side of the shaft 60 in the figure, and are integrated with the shaft 60 by a set screw 65a.

As shown in FIGS. 2 and 6, a bracket 70 is fixed to the main body of the apparatus by a fixing bolt 70a, and an air cylinder 69 is fixed to the bracket 70. A connecting member 71 is fixed to the tip of the piston rod of the air cylinder 69, and a slit is formed in the connecting member 71. The tip of the link plate 73 is inserted into this slit portion and penetrates the slit portion of the connecting member 71. The pin 72 is inserted into the through hole formed at the tip of the link plate 73 from the through hole, and the retaining ring 72a is press-fitted into the groove portion at the tip of the pin 72 to prevent the pin 72 from coming off.

An elongated hole 73a is formed through the link plate 73, and the pin 50 is inserted into the spacer 74 in the elongated hole 73a.
Through the through hole formed in the link plate 76, and the pin 50 is inserted into the connecting member 48 as described above.
It is inserted into the through hole 48d and is fixed by the set screw 48c. A long hole 76a is formed through the link plate 76, the pin 55 is inserted through the long hole 76a, is inserted into a through hole 54b formed in the disc member 54, and is fixed by a set screw 54c. ing.

A coil spring 78 is attached so as to span between a spring hooking portion 79 formed on the main body of the apparatus and a spring hooking portion 49b protruding from the collar 49.
The coil spring 78 is attached in a state in which a tension is constantly applied to urge the shaft portion 46a to return in a fixed direction.

Next, the operation of the rake stitch sewing machine according to this embodiment will be described.

When the drive shaft 4 is rotated, the cam 5 and the cam 2
6 rotates. The arm member 3 is moved in the vertical direction by rotating the cam 26 in the through hole 3a. On the other hand, when the cam 5 rotates, the swing rod 9 swings and the pin 1
The swing transmission lever 11 and the swing amount adjusting lever 12 connected by 3 are swung, and the arm member 3 is moved in the front-back direction.

Since the swing transmission lever 11 is integrally connected to the connecting member 16 via the pin 15, the swing of the swing transmitting lever 11 is converted into the swing of the connecting member 16. A shaft 18 is integrated with the connecting member 16, and the shaft 18
Is rotatably supported by the shaft support member 19, so that the swing of the connecting member 16 is converted into the rotation of the shaft 18. Since the swing lever 20 is integrated with the shaft 18, the rotation of the shaft 18 is converted into the swing of the swing lever 20. Since the horizontal rod 21 is connected to the swing lever 20 by the pin 22, the swing of the swing lever 20 is converted into the back-and-forth movement of the horizontal rod 21.

Since the arm member 3 and the sub-feed arm member 25 are connected to the tip of the horizontal rod 21 via the pin 23, the arm member 3 is moved in the front-rear direction and attached to the tip of the arm member 3. Sub feed dog 41 attached to the tip of the cloth feed tooth 29a and the sub feed support member 40
Can be moved back and forth. In synchronization with the vertical movement of the cam 26, the cloth feed tooth 29a and the auxiliary feed tooth 41 move in a substantially loop-shaped locus to move the cloth forward and drive a sewing mechanism such as a sewing machine needle. Rake stitches are applied to the cloth. The sub feed dog 41 cooperates with the cloth feed tooth 29a to convey the cloth in an arc shape and perform curved sewing.

The momentum of the arm member 3 in the vertical direction is constant depending on the shape of the cam 26, but the momentum in the front-back direction can be adjusted from the backward side to 0 forward by the following operation. . To make this adjustment:

That is, when the adjusting knob 61 is rotated, the shaft 60 rotates and the worm 65 integrated with the shaft 60 rotates. Since the worm wheel 53 meshes with the worm 65, the worm wheel 53 is rotated in association with the rotation of the adjusting knob 61.
Since the shaft 52 is integrated with the worm wheel 53 and the disc member 54 is integrated with the shaft 52,
The disc member 54 is rotated in association with the rotation of the worm wheel 53.

A pin 55 is inserted and integrated into a through hole 54b formed in the disk member 54, and a pin 50 is inserted and integrated into a through hole 48d of the connecting member 48 to form the pin 55 and the pin 50. And are connected by a link plate 76, the connecting member 48 is swung in conjunction with the rotation of the disc member 54. The connecting member 48 includes a swing adjusting crank 46
Since the shaft portion 46a is integrated, the swing of the connecting member 48 is converted into the rotation of the shaft portion 46a. A pin portion 46c formed integrally with the tip end portion of the shaft portion 46a via a projecting portion 46b has a swing amount adjusting lever 12.
Since it is inserted into the through hole 12b of the shaft portion 4
The rotation of 6a is converted into the swing of the swing amount adjusting lever 12.

The principle of adjusting the amount of movement of the arm member 3 in the front-rear direction will be described with reference to FIG. Figure 11
As shown in (a), when the pin portion 46c inserted into the swing amount adjusting lever 12 and the pin 15 inserted into the swing transmission lever 11 are on the coaxial axis line, the drive shaft 4 is shaken by the rotation. When the movable rod 9 is driven to swing, the pin 13 moves between the position 13 'and the position 13' in the figure. However, since the pin 15 and the pin portion 46c are on the coaxial axis, the connecting member 16 has No rocking occurs and the shaft 18 does not rotate. Therefore, the swing lever 2 connected to the shaft 18
0 and the horizontal rod 21 do not swing or rotate, and the arm member 3 is never moved in the front-rear direction.

As shown in FIG. 11B, the adjustment knob 6
The rotation of 1 causes the shaft portion 46 of the swing adjustment crank 46 to rotate.
When a is rotated, the pin portion 46c of the swing adjustment crank 46 moves to the position shown. The amount of movement changes depending on the amount of rotation of the adjustment knob 61, and the position in this figure shows an example. When the drive shaft 4 rotates in this state, the swing rod 9 moves from the position 9'to the position 9'in the figure. With this movement, the pin 13 is moved to the pin portion 46.
On the arc centered at c, the position is moved from position 13 'to position 13' in the figure. With this movement, the swing transmission lever 11
Moves from position 11 to position 11 'in the figure as shown, and pin 15 moves from position 15 to position 15' in the figure. The connecting member 16 moves from the position 16 to the position 16 'in the figure, and the shaft 18 is rotated. As a result, the swing lever 20 swings to move the horizontal rod 21 in the front-rear direction and the arm member 3 moves in the front-rear direction.

The state shown in FIG. 11C shows the operation when the horizontal momentum is adjusted from the state shown in FIG. 11B to the reverse direction, that is, the backward side. In the state of FIG. 11A, the horizontal movement is 0, but the cloth slightly moves in the front-rear direction due to the distance from the pin 29 provided on the arm member 2 to the cloth feed tooth 29a. The sewing machine needle is stabbed diagonally to the cloth. In order to stab the diagonally stabbed state almost vertically, it is effective to make a correction by slightly moving the cloth feed in the reverse direction (retraction direction) in the horizontal direction.

That is, as shown in FIG. 11C, when the adjusting knob 61 is rotated in the direction opposite to that in FIG. 11B and the shaft portion 46a of the swing adjusting crank 46 is rotated in the opposite direction. Includes the pin portion 4 of the swing adjustment crank 46.
6c is moved to the position shown. The amount of movement changes depending on the amount of rotation of the adjustment knob 61, and the position in this figure shows an example. When the drive shaft 4 rotates in this state, the swing rod 9 moves in the opposite direction from the position 9'to the position 9'in the figure. Along with this movement, the pin 13 moves from the position 13 in the drawing to the position 1 on the arc centered on the pin portion 46c.
Move between 3'positions in opposite directions. With this movement, the swing transmission lever 11 moves from the position 11 in the figure to
The pin 15 moves in the reverse direction between the positions 1'and the pin 15 moves in the reverse direction between the positions 15 'and 15' in the drawing. The connecting member 16 moves in the opposite direction from the position 16 to the position 16 'in the figure, and the shaft 18 rotates in the opposite direction. As a result, the swing lever 20 swings in the opposite direction to move the horizontal rod 21 in the front-rear direction, and the arm member 3 moves in the opposite direction to the front-rear direction.

When performing a sewing operation, the adjustment knob 61 is turned as described above to set the cloth feed amount required for the sewing operation. The cloth feed amount can be set by the scale of the scale plate 63 attached to the adjusting knob 61. Next, the drive shaft 4 is rotationally driven to move the arm member 3 in the vertical direction and the front-back direction to move the cloth feed teeth 29a attached to the tip of the arm member 3 in a loop shape to convey the cloth and drive the cloth. Sewing (rake sewing, etc.) is performed by reciprocating a sewing machine needle or the like in conjunction with the rotation of the shaft 4. When the sewing is completed for a desired length, the end portion is subjected to stop stitching.

The cloth feed amount must be close to 0 in order to smoothly and surely perform the tie stitching process, but in the conventional sewing machine, when the cloth feed amount is close to 0, the vertical movement amount also becomes small. If the restraint of the cloth by the cloth pressing mechanism is released and the cloth feed amount is set to 0, the cloth moves easily. Therefore, in the conventional sewing machine, it is not possible to sew a stop stitch properly unless an experienced sewing manufacturer is used.

However, with this rake stitch sewing machine,
As described above, the vertical momentum of the arm member 3 can be kept constant and the forward and backward momentum can be made close to zero. When intending to give tie stitches, for example, by depressing a foot switch, the air cylinder 69
Is operated, the piston rod of the air cylinder 69 is projected, and the link plate 73 is pushed up. Since the pin 50 is inserted into the long hole 73a of the link plate 73, the link plate 7 is not supported until the pin 50 comes into contact with the end portion of the long hole 73a.
Only 3 is pushed up and moved, and the pin 50 moves into the long hole 73a.
After coming into contact with the terminal end of the pin 50, the pin 50 is pushed up by the link plate 73 and the connecting member 48 is swung.

The shaft portion 46a of the swing amount adjusting crank 46 integrated with the connecting member 48 is rotated, and the swing amount adjusting lever 12 is swung in the direction in which the momentum in the front-rear direction becomes zero. As a result, the pin portion 46c and the pin 15 are arranged substantially coaxially, and the momentum in the front-rear direction of the arm member 3 is 0 or slightly forward (or slightly backward when set to backward). Since the vertical momentum is the same as before, the cloth is retained as it is, and if the sewing operation is performed in this state, the fastening work can be performed reliably and stably.

A link plate 76 has a pin 50 on the link plate 73.
And the pin 5 is inserted into the long hole 76a of the link plate 76.
5 is inserted, but when the pin 50 is pushed up, the pin 55 remains in the same position in the elongated hole 76a and only the link plate 76 is pushed up, so that the adjustment amount by the adjustment knob 61 does not change. . When the operation of the air cylinder 69 is released by depressing the foot switch again, the link plate 73 and the link plate 76 return to their original states through the opposite steps.

Here, a collar 49 is integrated with the tip of the shaft portion 46a of the swing amount adjusting crank 46,
Since the coil spring 78 is interposed between the spring hooking portion 49b protruding from the collar 49 and the spring hooking portion 79 on the apparatus main body side in a state of being biased in the direction to pull back the shaft portion 46a, the air cylinder 69 of the air cylinder 69 With the release of the operation, the swing amount adjusting crank 46 is returned to the original state. As a result, the swing amount adjusting lever 12 moves the adjusting knob 6
It returns to the position set by 1, and the normal sewing work of carrying the cloth in the forward direction and sewing can be performed.

[0052]

As described above, the rake stitch sewing machine of the present invention has the following effects.

(1) The momentum in the front-rear direction can be adjusted independently of the momentum in the up-down direction. Even if the momentum in the front-rear direction is reduced, the momentum in the up-down direction does not decrease, and the cloth feeding and the sewing are stably performed. It can be carried out.

(2) Even if the amount of momentum in the front-back direction is reduced, the amount of momentum in the vertical direction can be kept substantially constant, and cloth feeding and sewing can be performed stably.

(3) The amount of momentum in the front-rear direction can be adjusted independently according to the purpose of sewing.

(4) Only the momentum in the front-rear direction can be made close to 0 at the time of tie stitching, and stable tie stitch can be performed.

(5) The momentum in the front-rear direction can be set to the backward side, and the sewing machine needle can be corrected so as to pierce the cloth at substantially right angles.

(6) The displacement in the front-rear direction can be instantly reduced to almost zero, and, for example, stop stitching at the final stage of ordinary sewing can be stably performed.

[Brief description of drawings]

FIG. 1 is a view showing a rake stitch sewing machine according to an embodiment of the present invention.

FIG. 2 is a diagram showing a rake stitch sewing machine according to an embodiment of the present invention.

FIG. 3 is a diagram showing a rake stitch sewing machine according to an embodiment of the present invention.

FIG. 4 is a diagram showing a rake stitch sewing machine according to an embodiment of the present invention.

FIG. 5 is a view showing a rake stitch sewing machine according to an embodiment of the present invention.

FIG. 6 is a diagram showing a rake stitch sewing machine according to an embodiment of the present invention.

FIG. 7 is a view showing a rake stitch sewing machine according to an embodiment of the present invention.

FIG. 8 is an exploded perspective view showing a part of the rake stitch sewing machine according to the embodiment of the present invention.

FIG. 9 is an exploded perspective view showing a part of the rake stitch sewing machine according to the embodiment of the present invention.

FIG. 10 is an exploded perspective view showing a part of the rake stitch sewing machine according to the embodiment of the present invention.

FIG. 11 is a schematic view showing the operation of the rake stitch sewing machine according to the embodiment of the present invention.

[Explanation of symbols]

1 Vertical drive mechanism 2 Front-rear drive mechanism 3 arm members 4 drive shaft 5 cams 6 Forward-backward momentum conversion mechanism 7 Front-back momentum adjustment mechanism 8 Front-back momentum setting mechanism

Claims (5)

[Claims] 1. A rake stitch sewing machine equipped with a cloth feed mechanism for driving the cloth feed teeth synchronously in the vertical direction and the front-back direction to move the cloth feed teeth in a loop-shaped locus. 2. A rake stitch sewing machine comprising: a vertical drive mechanism for moving the cloth feed dog in the forward and backward directions, which is driven separately from the vertical drive mechanism. 2. The rake stitch sewing machine according to claim 1, wherein the up-and-down motion amount by the up-and-down drive mechanism is substantially constant, and the front-and-rear direction motion amount by the back-and-forth direction drive mechanism is variable. 3. The rake stitch sewing machine according to claim 1, further comprising a front-rear direction momentum adjusting mechanism capable of adjusting a front-rear direction momentum by the front-rear direction driving mechanism between a forward side and a backward side. 4. The front-rear direction momentum setting mechanism for instantaneously setting the front-rear direction momentum by the front-rear direction drive mechanism to substantially 0 or the retracted side.
The rake stitch sewing machine described. 5. An arm member having a cloth feed tooth attached to a tip thereof, a vertical drive mechanism for moving the arm member in the vertical direction, and the arm member driven in the front-back direction separately from the vertical drive mechanism. A front-rear driving mechanism for moving the front-rear driving mechanism, the front-rear driving mechanism converting the eccentric movement of the cam into a front-rear moving movement of the cam, the cam being attached to a drive shaft that is rotationally driven. The conversion mechanism, a displacement adjustment mechanism capable of adjusting the forward-backward momentum by the forward-backward momentum conversion mechanism to the forward side and slightly backward side across the point where the forward-backward movement is zero, and the forward-backward movement by the displacement adjustment mechanism. Rake sewing machine, characterized in that it comprises a front-back direction momentum zero setting mechanism for instantaneously changing the movement in the directional direction from the state in which it is set to the forward side to almost 0 or in the backward direction. Shin.