JP2626406B2 - Upper hand turning device of sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an upper shaft hand-rolling device for selectively rotating the upper shaft which is rotationally driven by a power driving means in an industrial sewing machine or the like. is there.

[0002]

2. Description of the Related Art Conventionally, an upper shaft hand-turning device of this kind has the following configuration. That is, a driven bevel gear is fixedly mounted on the upper shaft for reciprocating the sewing needle up and down disposed in the sewing machine arm, and a driving bevel gear engaged with and disengaged from the driven bevel gear and a handwheel located on the outer surface of the sewing machine arm. A pulley is connected with an operation shaft, the operation shaft is slidably and rotatably supported on a side wall of the sewing machine arm, and the operation shaft is changed by a switching lever provided on an outer surface of a side wall of the sewing machine arm. When the hand pulley is manually rotated while the driving bevel gear is held in meshing engagement with the driven bevel gear, the upper shaft can be manually rotated.

[0003]

However, in the hand-turning device having such a configuration, when the drive motor is operated while forgetting to switch the switching lever in the disengagement direction, the driven bevel gear is driven. And the drive bevel gear remain meshed, so that noise is generated as the rotation speed of the upper shaft increases, and the hand-held pulley on the outside of the sewing machine arm also rotates, which poses a problem in sewing work. .

[0004] It is an object of the present invention to solve these problems and to provide a safe upper hand turning device for a sewing machine.

[0005]

In order to achieve the above object, an upper hand turning device of a sewing machine according to the present invention is provided in a sewing machine arm, and at least an upper shaft for vertically reciprocating a sewing needle is driven by driving means. A drive gear that rotates and is rotatable by a hand pulley disposed outside the side surface of the sewing machine arm is configured such that a drive gear that can intersect and mesh with a driven gear provided on the upper shaft is rotatable. And an operating shaft that is rotatably and slidably supported on the sewing machine arm so that the drive gear is disengaged from the driven gear and is disengaged from the driven gear by a spring. The operating lever associated with the operating shaft is disengaged via an actuator operated by a start signal of the sewing machine so as to hold the driving gear in the engaged state with the driven gear while the driving gear is being biased. Thing .

[0006]

According to the structure of the present invention, when the manual pulley is pushed in and the operation lever is rotated in a predetermined direction, the meshing engagement between the drive gear and the driven gear can be maintained. The upper shaft can be manually rotated with one hand. And, even if the operator forgets the disengagement operation, if the actuator is operated by the start signal of the sewing machine, the operation lever is operated in the disengagement direction, and the spring of the operation shaft is biased. As a result, the drive gear can be automatically disengaged from the driven gear, so that the manual pulley can be prevented from rotating without permission.

Therefore, according to the present invention, when the sewing operation is switched, the generation of noise due to the meshing of the gears is prevented, the gears are prevented from being damaged, and the safety of the operator can be improved.

[0008]

Next, an embodiment of the present invention will be described. FIG. 1 is a perspective view showing an embodiment of a work cloth feeding device for a sewing machine. The work cloth feeder is arranged on a sewing machine table T mounted on the base 1, and is arranged between a guide rail 2 and a work cloth (not shown) arranged in front of the guide rail 2. The holding mechanism 3 is movable on the sewing machine table T in the X direction (the direction perpendicular to the longitudinal direction of the sewing machine arm M in plan view of the sewing machine table T) and the Y direction (the same direction parallel to the extending direction of the sewing machine arm M).
And an orthogonal movement mechanism 4 and a parallel movement mechanism 5. These are arranged over the space between the sewing machine arm M and the sewing machine table T and the lower part of the sewing machine table T.

The upper shaft 6 inside the sewing machine arm M and the lower shaft 7 for operating the cam drive mechanism below the sewing machine table T are moved in the same direction via a timing belt 9 arranged in the base column 8. It is connected so as to rotate, and is driven by a drive motor 10 whose speed can be adjusted. The holding mechanism 3 includes upper and lower holding frames 11a and 11b of a rectangular shape in a plan view for holding the work cloth, a holding mechanism 12 for holding the upper and lower holding frames 11a and 11b and raising the same, and lifting and lowering of an air cylinder and the like. Actuator 13 and an ejector device 14 for pushing the lower holding frame 11b forward (to the opposite side of the base column 8) of the sewing machine table T.

Further, by actuating the lifting actuator 13, the arm member 1 of the presser lifting mechanism 12 is moved.
5, the upper holding frame 11a is raised and lowered.
Then, the work cloth is arranged on the upper and lower holding frames 11a and 11b, and is securely held with the work cloth therebetween. The holding mechanism 3 is connected to a support member 16 that can move left and right in the X direction along the front surface of the guide rail 2 and moves integrally.

The orthogonal moving mechanism 4 moves the holding mechanism 3 in the longitudinal direction (X direction) on both left and right sides of the guide rail 2 with respect to the guide rail 2. As shown in FIG. A fixed right and left long rack 17, a pinion 18 attached to the front surface of the guide rail 2 and meshing with the rack 17, a spline shaft 19 for rotating and driving the pinion 18, and an AC servo capable of rotating forward and backward with the timing belt 20. It is composed of a motor 21 and the like.

A pair of support brackets 22, 22 are provided in the inner space of the base column 8, and a pulley body 23 is rotatably supported between the pair of support brackets 22, 22. The pulley body 23 pivotally supports the spline shaft 19 so that it can slide only in the Y direction with respect to the spline hole of the shaft center. The driving force of the AC servomotor 21 is transmitted to the spline shaft 19 via the timing belt 20 wound around the pulley 24 and the pulley body 23.

As shown in FIG. 1, the parallel moving mechanism 5 for moving the guide rail 2 in the parallel direction (Y direction) includes a pair of left and right guide rails 25, 25,
A pair of left and right timing belts 26 arranged in parallel with the direction in which the guide rails 25 extend, a drive shaft 27 for driving the timing belt 26, and an AC servomotor (not shown) for driving the drive shaft 27 to rotate forward and reverse. ) As the main elements. Each timing belt 26 is wound around a pair of front and rear pulleys (not shown) arranged on the upper portion of the base 1, and each timing belt 26 and the guide rail 2 (or the arm 28 fixed to the guide rail 2) are connected. It is detachably connected by a mounting bracket 29.

Next, a hand-turning device for the upper shaft 6 will be described.
This will be described with reference to FIGS. As shown in FIG. 7, a needle bar 30 on which a sewing needle N is mounted at a lower end and a presser bar 31 disposed adjacent to and parallel to the needle bar 30 are vertically movable at the distal end of the hollow sewing machine arm M. To support. The presser foot 32 detachably attached to the lower end of the presser bar 31 and the sewing needle N are disposed so as to face the needle plate 33.

Further, with the rotation of the upper shaft 6, the needle bar 30 reciprocates up and down (not shown) such as an eccentric cam fitted on a portion near the tip of the upper shaft 6 and a swing arm associated therewith. The needle bar 30 is configured to reciprocate up and down with respect to the needle hole 34 of the needle plate 33 by the moving mechanism, and the presser bar 31 is similarly moved by the intermittent vertical reciprocating mechanism 35.
It is configured to intermittently move up and down reciprocatingly in time with zero up and down reciprocating movement. In addition, the sewing machine arm M is provided with an adjusting mechanism 36 of a minimum height position of the presser foot 32 with respect to the needle plate 33 and a vertical stroke adjusting mechanism 37 of the presser foot 32 in association with the intermittent vertical reciprocating mechanism 35. .

In the middle of the upper shaft 6, a beveled driven gear 4 is provided.
0 is screw-fitted, and a bevel-tooth-shaped drive gear 41 that can intersect and mesh with the driven gear 40 at right angles,
Hand pulley 4 disposed outside one side of sewing machine arm M
2 are connected by an operation shaft 43. This operation shaft 43
Is a bearing 4 provided on the side wall 44 of the sewing machine arm M.
5 is supported so as to be rotatable and slidable in the axial direction. Further, a coil spring 47 is loosely fitted into a concave portion 46 opened outward on the side wall 44 between the coil spring 47 and a retaining ring 48 fixed to the operation shaft 43.

Further, a cylindrical cap 49 fitted and fixed to the operation shaft 43 is fitted in the recess 46 so as to be able to come and go. As a result, the drive gear 41 is urged by the coil spring 47 in a direction in which the meshing engagement with the driven gear 40 is released. When the manual pulley 42 is pushed to the position indicated by the solid line in FIG. 4 against the urging force of the coil spring 47, the driving gear 4
1 is in mesh with the driven gear 40.

As shown in FIG. 4, a pivot 50 is rotatably supported on the side wall 44 of the sewing machine arm M, and an operation lever 51 is fixed to the pivot 50 outside the side wall 44. As shown in FIG. 5, the operation lever 51 is urged by a torsion spring 52 so that the tip end 51 a always covers the opening of the recess 46. On the rear side of the operation lever 51, there is an auxiliary lever 53 for rotating the operation lever 51 back and forth.
And an actuator 54 such as an air cylinder.

When the piston rod 54a of the actuator 54 is protruded and the operation lever 51 is rotated in the direction of arrow A in FIG. 5 through the auxiliary lever 53, the tip portion 51a of the operation lever 51 is And the cap 49 projects from the recess 46 (the disengaged state). At this time, the distal end 51a of the operation lever 51 is at a position away from the outer periphery of the cylinder of the cap 49.

Conversely, when the piston rod 54a of the actuator 54 is retracted, the operating lever 51 is rotated by the urging force of the torsion spring 52 in the direction of arrow B in FIG. Since the distal end portion 51a of the operation lever 51 is rotationally urged to approach the operation shaft 43, the operator manually turns the pulley 42 to the side wall 4.
4, the cap 49 is submerged in the recess 46 via the operating shaft 43 (the drive gear 41 is engaged with the driven gear 40). The cap 49 can be held at the side by the side. At this time, the driven gear 40 and the driving gear 41 are engaged with each other, so that the sewing needle N can be reciprocated up and down manually by turning the hand pulley 42 by hand.

When the operation lever 51 is manually rotated in the direction of arrow A in the retracted state of the actuator 54, the engagement can be manually switched to release. As shown in FIG. 6, an arm 55 is fixed to the pivot 50 with a screw or the like inside the pivot 50 to which the operation lever 51 is attached (inside the sewing machine arm M). Is connected to a swinging lever 58 pivotally supported on a shaft 57, and a push-up portion 58a of the swinging lever 58 is engaged with a locking piece 59 at an intermediate portion of the holding rod 31. Facing the bottom of And the operation lever 5
6 is rotated in the direction of arrow A in FIG. Can hold. In addition, the operation lever 51 is moved to an arrow B
When rotating in the direction, the tip pushing-up portion 58a is largely separated downward from the lower surface of the stop piece 59, so that the presser bar 31 can reciprocate up and down in conjunction with the needle bar 30.

As shown in FIG. 1, a support arm 61 is provided on the base 1 so as to be rotatable.
An operation panel 62 having a start switch and the like is provided at the front end of the control panel 62. Then, the actuator 54 is actuated by a start signal of the sewing machine, and the piston rod 54a is protruded so that the auxiliary lever 53, the operation lever 51,
The engagement between the driving gear 41 and the driven gear 40 is released via the gear 7.

That is, when the start switch of the operation panel 62 is depressed, the drive motor 10 is started in accordance with the program stored in the electronic control panel 63 arranged inside the base 1, and the vertical shafts 6 and 7 are rotated. The piston rod 54a of the actuator 54 is operated so as to protrude a short time before the rotation, and the operation lever 51 is rotated in the direction of arrow A in FIG. Is automatically disengaged by the force of the coil spring 47.

Therefore, if the manual pulley 42 is pressed to the solid line state in FIG. 4 and the actuator 54 is operated and the driving gear 41 and the driven gear 41 are engaged and engaged in this state, the manual pulley 42 The vertical reciprocation of the needle bar 30 and the presser bar 31 can be executed manually.
This makes it possible to raise the sewing needle N from the needle plate 33, mount the sewing cloth N on the holding mechanism 3 with the work cloth therebetween, and perform the replacement of the sewing needle N, the lower thread bobbin, and the upper thread.

Then, when the start switch is depressed to start the sewing operation, the driving gear 41 and the driven gear 4 are pressed as described above.
Since the engagement with the gear 0 is automatically released, no noise is generated during the sewing operation due to the meshing of the gears, and the manual pulley 42 does not rotate, so that the safety of the operator can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a sewing machine.

FIG. 2 is a partially cutaway side view of a main part.

FIG. 3 is a side sectional view taken along the line III-III of FIG. 2;

FIG. 4 is an enlarged cross-sectional view of a main part taken along the line IV-IV in FIG. 2;

FIG. 5 is a side view taken along a line VV in FIG. 4;

6 is a side sectional view taken along the line VI-VI of FIG. 4;

FIG. 7 is a front view taken along the line VII-VII in FIG. 6;

[Explanation of symbols]

 M sewing machine arm T sewing machine table 1 base 2 guide rail 3 holding mechanism 4 orthogonal moving mechanism 5 parallel moving mechanism 10 drive motor 30 needle bar 31 presser bar 32 presser foot 40 driven gear 41 drive gear 42 hand pulley 43 operating shaft 47 Coil spring 48 Retaining ring 49 Cap 51 Operating lever 53 Auxiliary lever 54 Actuator

Claims (1)

(57) [Claims] A drive gear disposed in a sewing machine arm for rotating at least an upper shaft for vertically reciprocating a sewing needle by a driving means, while being interlocked with a driven gear provided on the upper shaft and capable of meshing therewith. Of the upper shaft of the sewing machine configured to be rotatable by a hand pulley disposed outside the side surface of the sewing machine arm, the operating shaft connecting the drive gear and the hand pulley is rotatable and the drive The gear is slidably supported on the sewing machine arm so as to be disengaged from the driven gear, and the drive gear is urged in a direction of disengaging by a spring, while the drive gear is engaged with the driven gear. An upper shaft hand-turning device for a sewing machine, characterized in that an operating lever associated with the operating shaft so as to maintain the state is disengaged via an actuator operated by a start signal of the sewing machine.