JPS6026152Y2 - Automatic embroidery machine drive belt adjustment device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a drive belt adjustment device for an automatic embroidery sewing machine.

Conventionally, in this type of sewing machine, a support stand holding an embroidery frame is driven in the X-Y direction by a timing belt.

However, the tension of the timing belt is adjusted by using an idler pulley and varying the position of the idler pulley or by varying the axis distance between the idler pulley and the sprocket that drives the timing belt.

For this reason, idler pulleys require a space to mount the idler pulley, which increases the size of the device.Also, in the case of a device in which the axis of the sprocket can be varied, adjustment work is labor-intensive and the mechanism becomes complicated. There was a drawback.

The object of this invention is to provide a drive belt adjustment device for an automatic embroidery sewing machine that can eliminate the above-mentioned drawbacks.

An embodiment of this invention will be described below based on the drawings.

Reference numeral 1.2 denotes a pair of sprockets rotatably supported at a distance from the machine frame 3, and fixedly supported on shafts IA and 2A, respectively.

4 is a Y-direction drive belt wound around sprockets 1 and 2;
Reference numeral 5 denotes a Y-direction drive motor connected to the shaft IA of the sprocket 1, which is operated by a stitch signal in synchronization with the vertical movement of a sewing machine needle (not shown).

Reference numeral 6 denotes an X-direction drive shaft which is parallel to the Y-direction drive belt 4 and rotatably formed on the machine frame 3 with three engaging portions 6a*6a extending along the axial direction and protruding from the supporting waist surface; 7 is an X-direction drive shaft; The X-direction drive motor connected to the direction drive shaft 6 moves the sewing machine needle (
(not shown), and is activated by a stitch signal.

Reference numeral 8 denotes a guide shaft that is horizontally spaced apart in a direction perpendicular to the X-direction drive shaft 6 and rotatably supported on the machine frame in parallel with the X-direction drive shaft 6.

9 has one end loosely fitted to the X-direction drive shaft 6 via a bearing 9A,
This is a support shaft whose other end is loosely fitted into the guide shaft 8 via a bearing 9B and which is connected to the Y-direction drive belt 4 with a bearing 9A.

10, as shown in FIGS. 2 and 3, a pole bearing 10b supported by a bearing portion 10a sandwiches an engaging portion 6a consisting of three protrusions formed along the axial direction on the circumferential surface of the X-direction drive shaft 6. This is a first movable sprocket that is fixedly engaged to prevent rotation relative to the shaft 6 and is supported on the X-direction drive shaft 6 so as to be movable along the retaining portion 6a.

Reference numeral 11 denotes a second movable sprocket supported on the guide shaft 8 so as to be movable along the guide shaft 8.

Reference numeral 12 denotes an X-direction drive belt wound around the first movable sprocket 10 and the second movable sprocket 11. Reference numeral 13 denotes a support stand movably supported in the axial direction on the support shaft 9 (see Fig. 4). Two long holes 13A, 13A are provided at both ends of the support shaft 9 in the direction of the support shaft 9, and two long holes 13a, 13a open on both sides of the long holes 13A, 13A, respectively.

14.14 is a lower clamping plate 14A having teeth formed on the upper surface to engage with the teeth of the belt 12, and a movable rod 15 supported by screws on the lower clamping plate 14A and inserted into the elongated holes 13A, 13A on the upper surface. and a screw pin 16 inserted into the long holes 13a, 13a.
This adjustment rod 14.14 is attached to the support base 13 by ports 16A, 16A, and the ends of screws 15A, 15A screwed horizontally into the support base 13 are screwed into the support base 13 horizontally. By pushing the moving rod 15, the X-direction drive belt 12 moves along the long holes 13A and 13B and is clamped by the upper and lower clamping plates 14B and 14A.
The tension of the belt 12 can be varied by moving both ends of the belt closer or farther apart.

Note that only one adjustment rod 14.14 may be provided on one side of the support base 13.

Reference numeral 17 indicates a guide plate fixed to the bearings 9A and 9B, which are spaced apart in a direction perpendicular to the support shaft 9 and parallel to the support shaft 9, and whose both ends are fixed to both ends of the support shaft 9; Sliding plates made of a material with a small coefficient of friction, such as Teflon, fixed to both ends of the guide plate 17 make sliding contact with the guide plate 17, thereby smoothing the movement of the support base 13.

In addition, 19 is a sprocket that interlocks with sprocket 1,
A second Y-direction drive belt 20 is wound around the bearing 9B.

Further, 21 is an embroidery frame provided on the support stand.

Next, the operation of this invention will be explained.

When the start switch is pressed, the X-direction drive motor 7 and Y-direction drive motor 5 operate based on the pre-programmed stitch signal.
It rotates in sync with the up and down movement of the needle.

As the X-direction drive motor 7 rotates, the X-direction drive shaft 6 rotates, and the first movable sprocket 10, which is engaged with the X-direction drive shaft 6 at the engaging portion 6a, rotates together with the drive shaft 6. do.

The rotation of the first movable sprocket 10 drives the X-direction drive belt 12 in the X-direction.

The second movable sprocket 11 rotates around the guide shaft 8 by driving the X-direction drive belt 12.

By driving this X-direction drive belt 12, the support stand 13 moves along the axial direction on the support shaft 9, and the sliding plate 18 provided on the back side of the support stand 13 moves while slidingly contacting the guide plate 17, As a result, the support stand 13 smoothly moves around the support shaft 9 while maintaining a parallel state without swinging.

As the support stand 13 moves, the embroidery frame 21 fixed to the support stand 13 moves in the X direction.

Next, the rotation of the Y-direction drive motor 5 causes the sprocket 1 to
rotates, thereby driving the Y-direction drive belt 4.

Since this Y-direction drive belt 4 is connected to a bearing 9A, the bearing 9A moves on the X-direction drive shaft 6, and the bearing 9B moves on the guide shaft 8 in the axial direction, that is, the Y direction.

Along with this, the support shaft 9, the support stand 13, and the X-direction drive belt 1
2 moves in the Y direction.

The first movable sprocket 10 moves in the Y direction on the drive shaft 6 while being guided by the engaging portion 6a formed on the X direction drive shaft 6, and the second movable sprocket 11 also moves on the guide shaft 8. Move in the Y direction.

As the support body 13 moves in the Y direction, the embroidery frame 21 also moves in the Y direction.

This combined movement of the embroidery frame 21 in the X and Y directions causes the needle to fall at a predetermined position on the cloth, thereby creating an embroidery pattern on the cloth in accordance with a pre-programmed stitch signal.

As mentioned above, according to this invention, the tension of the X-direction drive belt can be adjusted by using a support base to attach an adjustment rod to the X-direction drive belt, which is difficult to attach because the belt itself moves. This has the effect that adjustment can be performed in a short time and the adjustment device itself can be made compact.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a feeding device equipped with a drive belt adjusting device according to this invention, Fig. 2 is a perspective view of a first moving sprocket, Fig. 3 is a sectional view of the first moving sprocket, and Fig. 4 is a support FIG. 3 is an exploded perspective view of main parts showing the mounting state of the base and the X-direction drive belt. 4... Y direction drive belt, 5... Y direction drive motor, 6... X direction drive shaft, 7...
...X direction drive motor, 8...Guide shaft, 9.
...Support shaft, 10...First moving sprocket, 11...Second moving sprocket, 12.
...X-direction drive belt, 13 ... Support stand, 14 ... Adjustment rod, 17 ... Guide plate,
18...Sliding plate.

Claims (1)

[Claims for Utility Model Registration] A Y-direction drive motor that operates in synchronization with the vertical movement of the sewing machine's needle, a Y-direction drive belt that operates in conjunction with the Y-direction drive motor, and a Y-direction drive belt that operates in synchronization with the vertical movement of the sewing machine's needle. an X-direction drive motor that operates in conjunction with the X-direction drive motor; an X-direction drive belt that operates in conjunction with the X-direction drive motor; - In an automatic embroidery machine equipped with a support stand that moves in the Y direction and an embroidery frame fixed to the support stand, a pair of adjustment rods are provided at both ends of the support stand so that the movement can be adjusted along the direction of movement of the drive belt in the X direction. A drive belt adjustment device for an automatic embroidery sewing machine, characterized in that both ends or one end of an X-direction drive belt are fixed to a supporting adjustment rod.