JPS6231099Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a special sewing machine having an arm that can freely change the sewing direction through 360 degrees, freely adjust the width of the zigzag (staggered stitch), and maintain the adjusted width.

Conventionally, sewing machines used for binding large items such as futons from both sides are driven movably in synchronization in the front-rear direction and left-right direction, and are driven in synchronization with each other by sewing drive devices. It is known to have arms and bases that are separately provided above and below with the workpiece to be sewn interposed therebetween. The arm and base of the sewing machine can be moved in any direction by combining forward and backward and left and right movements, making it possible to sew a wide variety of patterns combining folded lines and small circles. However, the above-mentioned sewing machines only sew in straight lines and have little variation, and are inherently limited in their ability to handle small movements. To solve this problem, an arm that can be easily rotated has been proposed, and an arm that incorporates not only straight stitches but also zigzag stitches has also been proposed.

By the way, the above-mentioned known zigzag sewing machine has superior characteristics compared to previous sewing machines and can handle a variety of variable stitches, but has the disadvantage that the zigzag width is constant and zigzag stitches of various widths cannot be made. It was hot.

This invention was made in consideration of the above circumstances, and it can rotate freely to follow the sewing direction and sew in a straight line.
It is an object of the present invention to provide a sewing machine having an arm that can freely switch between zigzag stitches and adjust the width of the zigzag stitches.

The present invention will be explained below with reference to the drawings.

1 to 6 show an embodiment of a rotating zigzag sewing machine according to the present invention. FIG. 1 is a sectional view of arm A of a sewing machine, and reference numeral 1 in the figure indicates a frame. A support shaft 2 is vertically attached to the center of the upper part of the frame 1 to support the frame 1 rotatably within a horizontal plane. Further, near the center line 0 of the support shaft 2 of the frame 1, a rotating arm 3 is attached with a shaft pin 4 so as to be rotatable in a vertical plane. This rotating arm 3 has
The needle bar 5 is inserted into the shaft holes 6 and 7 and is attached to the rotary arm 3 so as to be movable in the axial direction, and rotates about the shaft pin 4 in a vertical plane including the center line 0 of the support shaft 2. It is configured to be moved left and right in FIG. 1 by an arm 3.

On the other hand, a needle bar crank mechanism 8 is provided on the right side of the frame 1 in FIG.
Also provided on the left side is a rotating arm crank mechanism 9 for rotating the rotating arm 3 to the left and right together with the needle bar 5 about the shaft pin 4 as a fulcrum. The needle bar crank mechanism 8 includes a rotating shaft 11 horizontally supported by a bearing 10 provided on the frame 1, a crank ring 12 fixed to one end of the rotating shaft 11, and a crank ring 12 fixed to one end of the rotating shaft 11. a crankshaft 13 fixed to the wheel 12;
A connecting rod 14 is rotatably attached to the tip of the crankshaft 13, and an insertion hole 15 provided at the free end (lower end) of the connecting rod 14 is connected to a connecting rod 14 that is rotatably attached to the tip of the crankshaft 13, and is inserted into an insertion hole 15 that is rotatably rotatable in the circumferential direction and movable in the axial direction. A connecting shaft 17 inserted and connected to the needle bar 5 with a universal joint 16
and a guide member 20 that guides the connecting rod 14 along the guide groove 19 via a slider 18 attached to the insertion hole 15 of the connecting rod 14. When the rotating shaft 11 is rotated, the crank wheel 12 is rotated. The connecting rod 14 moves up and down, and the needle bar 5 is moved up and down via the connecting shaft 17.
It has a structure that allows it to move up and down.

The rotating arm crank mechanism 9 also includes a grooved cam 21 that is rotated in synchronization with the rotating shaft 11 as described later, and a cam groove 22 of this grooved cam 21 (see FIG. 3).
A rotary arm 26 is provided with a protrusion (roller) 23 at the tip thereof fitted into the rotary arm 26 and its root end is fixed to a rotary shaft 25 which is rotatably supported by a bearing 24 of the frame 1. Swing arm 27 fixed at the tip
, a movable piece 29 movably fitted into the guide groove 28 of this swing arm 27, and this movable piece 29.
A connecting arm 32 whose one end is fitted onto the small shaft 30 of the rotary arm 32 and whose other end is fixed to the rotary arm 3 by a set screw 31 to connect the rotary arm 3 to the movable piece 29. When the grooved cam 21 is rotated, the rotating arm 26 rotates to rotate the swinging arm 27 left and right together with the rotating shaft 25, and the rotating arm 3 is rotated through the connecting arm 32. It has a structure in which it can be moved left and right using pin 4 as a fulcrum. Figures 1 and 3 show a state in which the center axes of the rotation shaft 25 and the small shaft 30 are aligned. In this state, even if the rotation shaft 25 rotates, the small shaft 30 does not move left or right. Without this, the needle bar 5 only moves up and down, resulting in straight stitching. However, the movable piece 29 (small shaft 30) is
When pulled upward along the guide groove 28, the small shaft 30
moves horizontally as the rotating shaft 25 rotates, and the needle bar 5 is subjected to both vertical and horizontal movements via the connecting arm 32 and the rotating arm 3, thereby performing zigzag stitching.

The moving member 33 has a configuration as shown in FIG. 4. That is, the base end of the threaded rod 60 is connected to the small shaft 30 via the moving piece 29. A gear 61 is screwed onto this threaded rod 60. The threaded rod 60 is inserted through the gear 61, and movement in the vertical direction is prevented by brackets 62, 62. The gear 61 is the gear 61
A, 61b, . . . are rotated by a motor 63 to move the threaded rod 60 up and down.
The vertical dimension of the threaded rod 60 can be digitally displayed using a well-known method, or the pulse motor 63 can be used to set the vertical movement pattern of the threaded rod 60 to set the sewing width of the zigzag stitch to a predetermined pattern. .
5 is a diagram using a pinion rack 64 as the moving member 33, and FIG. 6 is a diagram using a worm gear 65.
As in the case of FIG. 4, the zigzag stitch width can be adjusted using a digital display or a pulse motor.

Furthermore, the rotating shaft 11 is connected to a drive gear 34 which is rotatably attached to the support shaft 2, and an intermediate gear 3.
5. Vertical shaft 3 supported by bearing 36 of frame 1
7. They are connected via bevel gears 38 and 39, and the grooved cam 21 is supported by a horizontal shaft 41 which is supported by a bearing 40 of the frame 1, a worm gear 42, a worm 43, which is supported by a bearing 44 of the frame 1. It is connected to the rotating shaft 11 via an intermediate shaft 45, a timing pulley 46, a timing belt 47, and a timing pulley 48. Therefore, drive gear 3
4 is rotated with respect to the support shaft 2 by a required drive device (not shown), the rotation shaft 11 rotates, and the grooved cam 21 rotates in conjunction with the rotation of the rotation shaft 11. In the illustrated example, the drive gear 34 is rotated via a timing belt 49 and a timing pulley 50 by a drive device located far from the sewing machine, but the drive gear 34 is rotated directly by a pulse motor. It is also possible to adopt other structures such as rotating the 34.

Reference numeral 53 designates a guide protrusion fixed to the frame 1, which is inserted into an elongated hole 54 provided at the lower end of the rotating arm 3 to guide the rotating arm 3. Also,
Reference numeral 51 is a passive member that is moved by the action of the crankshaft 13 to operate a thread take-up (not shown) as is well known, and 52 is a passive member that is actuated by an intermediate shaft 45 to operate a cloth presser foot (not shown). As is well known, it is a crank that moves the machine.

Next, the operation of the rotating zigzag sewing machine according to the invention constructed as above will be explained.

1 and 3, the rotation axis 25 is shown in FIGS.
This shows a state of straight stitching in which the small shaft 30 is fixed at the center by the moving member 33. When the drive gear 34 is rotated in this state, only the needle bar crank mechanism 8 operates (rotation). Crank mechanism for moving arm 9
(does not work because the small shaft 30 is located at the center of the rotating shaft 25) The needle bar 5 is moved up and down to sew a cloth (not shown) in a straight line. In the case of straight stitching, even if the sewing direction of the cloth changes, there is no need to rotate the frame 1 in that direction.

In the case of zigzag stitching, the small shaft 3 is moved by the moving member 33.
0 can be moved upward together with the movable piece 29 and stopped at an arbitrary position, or can be moved again during sewing if necessary. Further, by using a pulse motor to drive the moving member 33, the sewing width can be changed in a fixed pattern. Therefore, the drive gear 3
4 operates two crank mechanisms 8 and 9, the needle bar crank mechanism 8 moves the needle bar 5 up and down, and the rotating arm crank mechanism 9 moves the rotating arm 3 using the shaft pin 4 as a fulcrum. Rotate left and right at any angle. This allows sewing including zigzag stitches with various sewing widths, but when zigzag stitches are included, the support shaft 2 rotates and the frame 1 follows in the sewing direction.

As explained above, the rotating zigzag sewing machine of this invention is equipped with a needle bar crank mechanism 8 on one side of the frame 1 centering on the needle bar 5, and a rotating arm crank mechanism 9 on the other side. Because of this structure, it is easy to align the entire center of gravity with the rotation center of the support shaft 2, and therefore the sewing machine can operate smoothly without various problems caused by a biased center of gravity. . Furthermore, since two crank mechanisms 8 and 9 are provided on the left and right sides of the needle bar 5, the crank mechanisms 8 and 9 and the transmission mechanism such as the rotating shaft 11 that moves them are necessarily spread over a wide surface so as to surround the needle bar 5. Since the crank mechanism 8,
The generation of turning torque and the resonance of minute vibrations caused by the operation of the transmission mechanism 9 and the transmission mechanism described above are prevented. Furthermore, the moving member 33 that adjusts the horizontal deflection width of the needle bar is
By stopping the small shaft 30 at an arbitrary position and using a pulse motor as a motor to drive the moving member, the zigzag stitch width can be changed in a fixed pattern, which has the advantage of being able to automatically perform various types of complicated sewing. .

[Brief explanation of the drawing]

1 to 3 show one embodiment of a rotary zigzag sewing machine according to the present invention, in which FIG. 1 is a sectional view of an arm of the sewing machine, FIG. 2 is a plan view showing the mounting state of an intermediate shaft to a frame, FIG. 3 is a sectional view taken along line - in FIG. 1, and FIGS. 4 to 6 are a perspective view of the sewing machine.
The figures show examples of moving members, Fig. 4 is a diagram of a device that uses a motor to rotate a gear to move a small shaft up and down, Fig. 5 is a diagram of a device using a pinion rack, and Fig. 6 is a diagram of a device using a worm gear. 1... frame, 2... support shaft, 3... rotating arm, 4... shaft pin, 5... needle bar, 8... crank mechanism for needle bar, 9... crank mechanism for rotating arm, 21
...groove cam, 22... groove, 23... protrusion, 24...
...bearing, 25...rotating shaft, 26...rotating arm,
27: Swing arm; 28: Guide groove; 29:
Movable piece, 30... small shaft, 31... set screw, 32
...connecting arm, 33...moving member, 60...threaded rod, 61, 61a, 61b...gear, 62...
Bracket, 63...Motor (pulse motor),
64...Pinion rack, 65...Worm gear, A...Swivel zigzag sewing machine arm.

Claims (1)

[Scope of utility model registration request] A frame supported rotatably in a horizontal plane by a support shaft, a rotating arm attached near the center line of the support shaft of this frame so as to be rotatable in a vertical plane by a shaft pin, and this rotation arm. a needle bar that is attached to the movable arm so as to be movable in the axial direction of the rotary arm and configured to be movable in a vertical plane that includes the center line of the support shaft;
A crank mechanism for the needle bar that moves the needle bar up and down with respect to the rotating arm, and a crank mechanism for the rotating arm that rotates the rotating arm together with the needle bar at a free angle in the left and right direction using a pivot pin as a fulcrum and holds the rotating arm. and an arm comprising:
The rotating arm crank mechanism has a grooved cam that is rotated in synchronization with the needle bar crank mechanism, and a protrusion at the tip of the grooved cam is fitted into the cam groove of the grooved cam, and the rotating arm is pivoted on a bearing of the frame. A rotating arm whose base end is fixed to a shaft, a swinging arm fixed to the tip of the swinging shaft, and a movable piece movably fitted into a guide groove of the swinging arm. , one end of the movable piece is fitted onto the small shaft of the movable piece, and the other end is fixed to the rotary arm by a set screw, connecting the rotary arm to the movable piece and the motor. The movable piece and the guide groove are moved to any desired position.
A rotating zigzag sewing machine characterized by comprising a moving member that is stopped.