JPS5923840B2 - sewing machine transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a first rotating body supported on a workbench so as to rotate in conjunction with a drive source, and one end of which is engaged with the main shaft of the sewing machine in the rotational direction. A transmission device for a sewing machine that transmits power from a drive source to a main shaft via a second rotating body supported on a workbench that engages with the rotating body and rotates in conjunction with the second rotating body, particularly when the second rotating body is connected to the first rotating body. It is characterized in that the sewing machine can be tilted about a straight line parallel to the main axis by separating from the sewing machine and setting it at a specific angle.

Embodiments of the present invention will be described below with reference to the drawings.

The sewing machine 1 of this embodiment is a buttonhole sewing machine,
Clutch Z is engaged by the operator's operation of the sewing machine to start the sewing machine, and after a predetermined number of stitches have been formed, clutch Z is disengaged and the sewing machine stops mechanically.

Further, the object to be sewn is supported by the cloth holding device X, linearly moved in one direction by the cloth feeding device Y, and then linearly moved by the same distance in the opposite direction.

:) Clutch Z In Figs. 6 and 8, a horizontal shaft 2 fixed to a workbench (not shown) has a tapered friction surface 3 whose inner diameter widens toward the sewing machine 1, and a belt 4 is connected to the motor (Fig. (not shown)
A first rotating body 5 that rotates in one direction in conjunction with A second rotating body 9, which has grooves 8 and 8' at two opposite positions, is provided with a shaft 2 held in between an annular protrusion 1 that protrudes in the axial direction, and is movable in the axial direction of the shaft 2. fit.

Further, a coil spring 16 is compressed and disposed between a buckle portion 90 provided at the left end of the shaft 2 and the second rotating body 9, and constantly presses the second rotating body 9 to the right.

The shaft 10, which is perpendicular to the shaft 2 and fixed to the workbench, is moved and locked in the counterclockwise direction from the state shown in FIG. The activation lever 11 is supported when it is moved back to its original position.

A link 15 having engagement shafts 13 and 14 protruding parallel to the shaft 12 at both ends is loosely fitted into the shaft 12 fixed to the workbench parallel to the shaft 10, and one of the engagement shafts 13 is It loosely fits into an annular groove 1γ provided on the outer periphery of the second rotating body 9, and the other engaging portion 14 is arranged in relation to the activation lever 11 so as to come into contact with and separate from it when the activation lever 11 is displaced to two positions.

In FIGS. 2 and 5, a second rotating body is attached to one end of a main shaft 18 rotatably supported on the sewing machine frame 1 so as to coincide with the axis of the shaft 2 when the sewing machine 1 is placed upright on a workbench. a third rotating body 20 having protrusions 19 and 19' that loosely fit into the grooves 8 and 8/ of the protrusion 1 of 9; and a stop cam 2 having a notch 21 on the outer periphery.
2 are fixedly provided.

Although not shown in detail, a shaft 23 supported on the machine frame 1 so as to be movable in parallel with the main shaft 18 is always pressed to the right by a coil spring 24 compressed between the shaft 23 and the machine frame. A stop lever 2 is provided at one end with an engaging portion 25 projecting downward corresponding to the notch 21 of the stop cam 22.
The other end of 6 is fixed, and a groove 21 is provided on the outer periphery.

On the other hand, a pin 30 corresponding to the groove 21 of the shaft 23 is provided on a latch 29 which is rotatably supported on the machine frame 1 by a step screw 28, and the latch 29 is always set so that the pin 30 enters into the groove 2γ. FIG. 2 A spring 31 that presses counterclockwise is stretched between the machine frame 1 and the machine frame 1.

In addition, the second rotating body 9, the third rotating body 20, and the stop lever 26
The relationship between the latch 29 and the latch 29 is such that when the sewing machine is started, the starting lever 11 is rotated counterclockwise and disengaged from the engagement shaft 14 of the link 15, and the second rotating body 9 is moved to the right by the action of the coil spring 16. Even if the friction surfaces 3 and 6 of the first rotating body 5 and the second rotating body 9 are moved, the protrusion 19 of the third rotating body 20
, 19' remain engaged with the grooves 8, 8 of the protrusion 1, the rotation of the motor is transmitted to the shaft 18, and the stop lever 26 is moved to the left against the coil spring 24 through an appropriate means. When the groove 21 of the shaft 23 matches the moving path of the pin 30, the latch 29 is rotated counterclockwise in FIG.
3 and the stop lever 26 are restrained in the axial direction of the shaft 23 at that position.

Further, as will be described later, the latch 29 is rotated counterclockwise against the spring 31 by the release means for the latch 29 which is activated in connection with the end of the sewing cycle, and the pin/30 is removed from the groove 2γ, so that the shaft 23 and the stop lever 26 are returned to the right side in FIGS. 2 and 5 by the coil spring 24, and in conjunction with this, the starting lever 11 is returned to the position shown in FIG. The friction surfaces 3 and 6 of the body 9 are configured to be separated.

1:) Cloth feeding device Y As shown in FIGS. 1 and 2, a worm 32 and a gear 33 are fixed to the main shaft 18, and a sub-shaft is rotatably supported in parallel to the main shaft 18 with respect to the machine frame 1. 34, a gear 35 that meshes with the gear 33, and a cam 36 that is eccentric with respect to the subshaft 34.
and fix it.

As shown in FIG. 3, a square groove 38 is formed in the feed adjustment shaft 37, which is swingably supported on the machine frame 1 in parallel with the sub-shaft 34, passing through its center of swing.

The screw shaft 39 has a threaded portion on the outer periphery and is rotatably supported on the machine frame 1 in parallel with the main shaft 18.
The feed table 40 is supported so as to be translated in parallel along its axis by zero rotation, and a one-way flange W, which will be described later, is provided at the left end.

That is, as shown in FIG. 3, the one-way clutch W includes an outer frame 41 having a cylindrical portion and fixed to the screw shaft 39, a rocking body 43 having a concave portion 42 open in the radial direction and fixed to the screw shaft 39, and an angular shape. A partition piece 45 is formed with slopes 44 and 44' and is loosely fitted into the recess 42 of the rotating body 43.
2, and a pair of protrusions 4γ between the outer frame 41 and the swinging body 43.

41' and is rotatable around the main shaft 18.
Although not shown in detail, a cylindrical roller 49 disposed between the rocking body 43 and the cylindrical portion of the outer frame 41 and between the pair of protrusions 47 and 41' loosely fits into the screw shaft 39 and extends along the screw shaft 39. It consists of a converting body 96 which moves the rotating plate 48 to the position shown in FIG. 3 and the opposite position by sandwiching the partition piece 45. When the movable body 43 rotates in the direction of the arrow a, the outer frame 41 rotates in the same direction with the screw shaft 39 via the rollers 49, and when the rocking body 43 rotates in the direction indicated by the arrow, the rollers 49 move against the outer frame. When the rotation of the rocking body 43 is not transmitted to the outer frame 41 away from the cylindrical portion of the rocker 41, and when the rotary plate 48 is rotated to the opposite position and the roller 49 is moved to the position indicated by the two-dot chain line in FIG. , even if the rocking body 43 is rotated in the direction of arrow a, the rotation is not transmitted to the outer frame 41, and when the rocking body 43 is rotated in the direction of arrow It will be set up so that it can be communicated to.

On the other hand, a square piece 51 is attached to one end of the rod 50 loosely fitted to the cam 36.
is rotatably supported, and the square piece 51 is rotated by the feeding adjustment shaft 3.
The rod 50 is slidably and loosely fitted into the square groove 38 of the rod 50.
The other end of a connecting frame 53, which has one end connected to the rocking body 43 via a step screw 52, is rotatably connected to one end of the connecting frame 53.

As shown in FIGS. 1 and 2, an interlocking body 55 is swingably supported on the machine frame 1 around a stepped screw 54 orthogonal to the screw shaft 39.
One end is attached to the arm portion 55a having a long hole 56, and the feed adjustment shaft 3
A connecting rod 5 freely connected to an arm protruding in a radial direction from 7.
The other end of 1 is movably and lockably connected along the elongated hole 56 by a step screw 91.

Note that a portion of the connecting rod 5γ has a double shaft so that its length can be changed to a desired length.

Furthermore, a release pawl 59 corresponding to the protrusion 58 of the latch 29 is fixed to the arm portion 55b of the interlocking body 55.

Further, the arm portion 55c of the interlocking body 55 supports a swinging piece 60 so as to be swingable about a step screw 61, and a movable plate 62
is provided so as to be movable substantially parallel to the screw shaft 39 via a step screw 63 and a long hole 64.

A U-shaped support 65 is fixed to the feed base 40 supported on the screw shaft 39, which supports the screws 66 and 66' on the opposing surface with the movable plate 62 in between so as to be movable and lockable in the moving direction of the movable plate 62. .

The converting body 96 loosely fitted onto the screw shaft 39 is connected to the interlocking body 55 via the connecting rod 61, for example, the first and second
The converter 96 moves to the left along the screw shaft 39 by swinging clockwise in the figure, and moves the rollers 49 of the one-way clutch W to the position indicated by the chain dotted line in Figure 3 (to the right of the partition piece 45), and interlocks. When the body 550 swings counterclockwise, the converting body 96 moves to the right, and the roller 49 is provided to move to the position shown by the solid line in FIG. 3 (to the left of the partition piece 45).

As shown in FIGS. 1 and 11, a shaft 68 supported on the machine frame 1 and perpendicular to the main shaft 18 has a rotating body 70 having a grooved cam 69 formed on its end surface, and a worm wheel 12 that engages with the ratchet wheel 11 and the worm 32. The rotating body 13 is loosely fitted into the rotating body γ0, and a pawl body γ5 is attached to the shaft 14 provided parallel to the shaft 68.
is fitted loosely, and an appropriate elastic force is applied to the pawl body 15 in a clockwise direction so as to press the ratchet wheel 11 counterclockwise.

Opposing surface 16. The locking bodies 18, which are rotatably connected to the free ends of links 79 and 80 which have γγ and are swingably supported with respect to the machine frame, are rotated through the surface 16 or γ1 by the swinging of the swinging piece 60. Stoppers 81 and 81' are provided on the locking body γ8 so as to be movable in the left-right direction in the figure and alternately engage with the pawl body γ5 during each reciprocating movement.

Further, a roller 82 that loosely fits into the grooved cam 69 of the rotating body γ0 is provided in the middle, and the free end of a link 83 whose one end is rotatably supported with respect to the machine frame is connected to the interlocking body 55 via a link 84.

111) Cloth Holding Device
The lower end of 5 is connected to the feed table 40 via flexible connecting means 86 and 87 that loosely fit into the opening of the bed (not shown), and the presser foot has a needle hole corresponding to the needle hole of the slider 85. 8
8 is rotatably supported on the slider 85 via a shaft 89, and a coil spring 92 is compressed and disposed between the free ends of the slider 85 and the presser foot 88 so as to always press the presser foot 88 counterclockwise. do.

On the other hand, as shown in FIGS. 4 and 5, an axis 93 perpendicular to the axis 23
A piece 95 has a shaft 93 which is parallel to the shaft 23 and is loosely fitted to a shaft 94 which is fixed in the middle of the stop lever 26. A piece 95 has an engaging part 96 in the middle and one end is loosely fitted to a shaft 91 which is fixed to the machine frame. The other end of the fitted link 98 is loosely fitted.

Further, the free end of the presser foot lifting arm 99, whose one end is rotatably supported relative to the machine frame, is disposed so as to be able to engage with the free end of the presser foot 88, and the free end of the presser foot lifting arm 99 has a link 9 at its lower end.
Engagement/disengagement body 101 having claws 100 corresponding to engagement portions 96 of 8
The upper end of the spring 1 is rotatably connected to the engaging/disengaging body 101.
02 always applies a counterclockwise acting force.

This invention has the above-described structure, and to explain its operation next, Figs. 2.4.5 and 6 show the sewing machine in a stopped state, and only the first rotating body 5 is interlocked with the motor (and idles). .

When the appropriate operation pedal is operated from this state, the engaging and disengaging body 1
01 is swung to the left against the coil spring 102, and the claw 10
0 disengages from the engaging portion 96 of the link 98, the presser foot 88 is rotated counterclockwise by the coil spring 92.
The object to be sewn is held between the sliding body 85 and the sliding body 85 .

Next, when the operating pedal is further actuated, the stop lever 26 moves to the left together with the shaft 23 against the coil spring 24, and when the groove 21 of the shaft 23 coincides with the pin 30 of the latch 29, the coil spring 31 causes the stop lever 26 to move to the left. 29 is clockwise in Figure 5 (
2), the pin 30 enters the groove 21,
The shaft 23 and the stop lever 26 are held in the position moved to the left.

Further, in conjunction with the movement of the stop lever 26 at this time, the activation lever 11 rotates counterclockwise from the state shown in FIG. 8, and its free end disengages from the engagement shaft 14 of the link 15.
The second rotating body 9 is moved to the right along the axis 2 while swinging the link 15 by the coil spring 16, and the friction surfaces 6 and 3 of the second rotating body 9 and the first rotating body 5 are brought into contact with each other. The main shaft 18 rotates in the direction of the arrow via the third rotating body 2o, and the sewing machine operates.

That is, since the sewing mechanism operates in conjunction with the main shaft 18 and the sub-shaft 34 rotates via the gears 33 and 35, the square piece 51 is moved by the eccentric cam 36 through the rond 5o into the square groove 38 of the slot adjustment shaft 3γ. It moves back and forth along the .

At this time, the square groove 38 is inclined upward to the left as shown in FIG. is separated from the cylindrical portion of the outer frame 41 and only the rocking body 43 rotates idly with respect to the screw shaft 39. However, when the square piece 51 descends in the groove 38, the rocking body 43 is moved in the direction of arrow a via the connecting rod 53. As it rotates, the rollers 49 bite between the cylindrical portion of the outer frame 41 and the rocking body 43, and the screw shaft 39 rotates together in the direction of arrow a.

Note that when the square piece 51 descends in the groove 38, the sewing machine needle pierces the workpiece, and when the square piece 51 moves up within the groove 38, the sewing machine needle comes out upward from the workpiece. Since the timing of the needle and the square piece is the same as shown in FIG. While the needle remains in place, it is intermittently moved to the left while it is coming out of the material being sewn, and one edge stitch of the buttonhole is formed.

Further, as the support body 65 moves to the left together with the feed table 40, the moving plate 62 is moved by the screw 66 as shown in FIG.
In order to move leftward, the swinging piece 60 engages the locking body 18 at the lower end.
Press the surface T6 to the right to move the locking body 18 from FIG.
move to the state of

During this time, the stopper 81 of the locking body 18 separates to the right from the claw body γ5, and the rotation of the rotating body γ3 is transmitted to the rotating body 10 due to the engagement between the claw body 15 and the mold wheel 11, and the rotation of the rotating body γ0 is reduced. After turning half a turn, the claw body 15 touches the stopper 81' on the opposite side.
The mold wheel 15 slides due to the rotation of the rotating body 13, and the rotating body 10 becomes stationary again.

Also, while the rotary body 10 rotates half a rotation, the needle bar is swung greatly to perform bar-tack stitching on one side of the button, and the link 83 is swung counterclockwise via the pin 082 that loosely fits into the groove cam 69. As shown in FIG. 9C, the interlocking body 55 swings clockwise around the step screw 54, so that the feed adjustment shaft 3T is rotated clockwise in FIG. move,
The square groove 38 is symmetrically tilted to the upper right in FIG. 3, while the converter 96 is moved to the left in FIGS. Since the roller 49 rotates in the direction shown in FIG.

Therefore, when the square piece 51 moves up in the square groove 38 in conjunction with the main shaft 18 as described above, the swinging body 43 moves in the direction of the arrow a, so that the swinging body 43 idles with respect to the screw shaft 39. Furthermore, when the square piece 51 descends within the square groove 38, the swinging body 43 moves in the direction of the arrow, so that the outer frame 41 moves through the rollers 49.
moves together with the screw shaft 39 in the direction of the arrow mark, opposite to the above.

That is, before and after the feed adjustment shaft 31 is rotated by the interlocking body 55, only the direction of rotation of the screw shaft 390 is opposite, and the timing of rotation remains the same. While the needle is coming out of the sewing item, it moves intermittently to the right in Figures 1 and 2.

Further, when the feed base 40 moves to the right, the screw 66' of the support body 65 rotates the swinging piece 60 clockwise, and the locking body 18 is moved to the left as shown by the two-dot chain line in FIG. 9C. Since it moves to
The stopper 81' and the claw body γ5 are disengaged, and the rotating body γ3
The rotation is transmitted to the rotating body γ0 via the pawl body γ5 and the die wheel γ1, and the rotating body 70 rotates half a turn to the state shown in FIG. 10A.

Then, while the rotary body 10 rotates half a rotation, the needle bar is swung greatly and the other bartack of the buttonhole is sewn.
As shown in the figure, the interlocking body 55 is swung to the state shown in FIG. body 96
Through this, the rollers 49 of the one-way flange W are also returned to the state shown in the figure.

Furthermore, as the interlocking body 550 swings counterclockwise, the release claw 59 facing the protrusion 58 moves the latch 29 into the second position against the spring 31.
As it rotates clockwise in the figure, the pin 30 comes out of the groove 2γ of the shaft 23, so that the shaft 23 and the stop lever 26 are fixed to the coil spring 24.
The engaging portion 25 of the stop lever 26 rides on the outer periphery of the cam 22, and the shaft 23 and the stop lever 2
6, the activation lever 11 is returned to the position shown in FIG. The rotation is not transmitted to the main shaft 18 and the second rotating body 9 and the main shaft 1
8 rotates due to inertia, and the stop lever 2 is rotated by the cam 22.
6 is rotated upward around the shaft 23 against the spring 103, the engaging portion 25 falls into the notch 21, and the main shaft 18 is forcibly stopped.

Note that when the stop lever 26 is rotated upward, the link 9
Since the engaging portion 96 of 8 moves above the pawl 100 indicated by the chain dotted line in Figure 4, the engaging/disengaging body 101 is swung to the right by the spring 102, and then the stop lever 26 is rotated downward. At this time, the engaging portion 96 and the pawl 100 engage, so that the presser foot lifting arm 99 is moved from the dotted chain line to the solid line in the fourth drawing through the engaging and disengaging body 101, and the presser foot end 88 resists the coil spring 92. It will be opened.

Note that the two opposing screws 66 and 66' of the support body 65 are moved in and out appropriately, and the screws 6 are removed after the feed base 40 has moved.
By changing the distance that 6 and 66' hit against the moving plate 62 and the swinging piece 60, the amount of movement of the feed table 40, that is, the length of the buttonhole changes.

If the connecting position between the connecting rod 51 and the interlocking body 55 is moved, for example, to the right along the long hole 56 from the position shown in FIG. Since the angle becomes smaller, the swing angle of the swing body 43 and the screw shaft 390
The rotation angle becomes smaller, and therefore the cloth feed pinch becomes smaller.

As shown in FIG. 6, 1, after the second rotating body 9 is separated from the first rotating body 5, the sewing machine 1 When turned from the solid line to the two-dot chain line, the protrusion 19 of the third rotating body 20 comes out of the groove 8 of the second rotating body 9 along the arrow A, and the protrusion 19' temporarily moves into the groove 8 along the arrow opening. After pulling out from /, the second rotary body 9 is slightly rotated counterclockwise to further pass through the groove 8, and the second rotary body 9 and the third rotary body 20 are disengaged.

As described above, the present invention provides a sewing machine frame that is rotatably supported on a workbench so as to be able to stand upright and tiltable, and to be rotatably locked around a horizontal straight line, and a fixed straight line that is parallel to the center line of rotation of the sewing machine frame. a main shaft supported on the machine frame so as to be rotatable around the main shaft; A second rotating body is supported on a workbench so as to be movable on the rotational axis of the rotating body and can be rotated or stopped about the axis by joining or detaching from the first rotating body; Since the construction includes the second rotary body and the approach/separation means provided on the main shaft so that the sewing machine frame can be rotated when the rotary body is detached and stopped at a specific rotation angle, the part protruding from the sewing machine frame is The smaller size eliminates accidents such as damage to the sewing machine when transporting it, and the weight of the sewing machine itself is reduced, making it easier to tilt and raise the sewing machine on the workbench, making it easier to handle. Become.

In addition, the sewing machine can be driven and stopped by moving the first rolling body along its rotation center line and coming into contact with and separating from the first rotating body, so the sewing machine can be driven and stopped by changing the belt hooking position. This eliminates accidents such as the belt breaking or slipping due to belt loosening, ensuring reliable power transmission from the drive source to the main shaft, and providing excellent durability.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the feeding device, Fig. 2 is a plan view of the feeding device, Fig. 3 is a partially sectional side view of the feed adjustment shaft and one-way clutch, and Fig. 4 is a front view of the cloth holding device. , Fig. 5 is a perspective view of the stop lever and latch, Fig. 6 is a front view of the sewing machine, Fig. 1 is an explanatory diagram showing the relationship between the second rotating body and the third rotating body, and Fig. 8 is the detransmission Perspective views of the device, Figures 9a, b and C
10 is an explanatory diagram of the operation of the cloth feeding device, FIGS. 10a and 10b are explanatory diagrams of the operation of the cloth feeding device, and FIG. 11 is a side view of the rotating body. In the figure, 2 is the main shaft, 50 is a rond (actuating body), 43 is a swinging body, 39 is a screw shaft (rotating shaft), 40 is a feed base, 96 is a conversion means, 31 is a feed adjustment shaft (reversing means), 26 is a stop lever, 5 is a first rotating body, 9 is a second rotating body, 20 is a third rotating body, and 8 and 19 are grooves and protrusions constituting the approaching/separating means.

Claims (1)

[Claims] 1. A sewing machine frame supported so as to be rotatable and lockable around a horizontal straight line so as to be able to stand upright or tilt relative to the workbench, and rotatable around a fixed straight line parallel to the center line of rotation of the sewing machine frame. A main shaft supported on the machine frame, a first rotating body supported on a workbench so as to be rotatable about a fixed straight line parallel to the main shaft in conjunction with a drive source, and a first rotating body on the rotational axis of the first rotating body. A second rotating body is supported on a workbench so that it can be rotated or stopped about its axis by joining or separating from the first rotating body, and when the first rotating body separates from the second rotating body, A transmission device for a sewing machine, comprising a second rotary body and a contact/separation means provided on a main shaft so that a sewing machine frame can be rotated when the machine frame is stopped at a rotation angle.