JPH021709Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic reel fixing mechanism, and more particularly to an automatic reel fixing mechanism that automatically fixes a reel or an open reel attached to a cartridge to a retainer of a drive device.

Conventionally, a mechanism for automatically fixing a reel to a retainer of a drive device fixes the reel at three or more support points and determines the center position of the reel. Therefore, it is necessary that the distance from the true center to the support point of the reel is accurate, and if this distance goes out of order, the center of rotation will shift, so a fixing mechanism that always maintains the position of each support point accurately is required. This has made the reel fixing device complicated and has also been a factor in increasing costs.

This idea was created in view of the above circumstances.
The reel is positioned by the guide part of the retainer where the reel is set, and the eccentric roller is driven by the guide pin guided by the contour of the cam, and the reel is moved between the two positions.
The reel is fixed by the eccentric roller, and the support point for fixing the reel is regulated by the shape of the cam that drives the eccentric roller.It has a simple structure and is highly accurate in fixing the reel by the eccentric roller. The purpose of the present invention is to provide an automatic reel fixing mechanism that allows the center of rotation of the reel to be determined without the need for rotation. Therefore, the automatic reel fixing mechanism of the present invention includes a retainer equipped with a guide portion for positioning the inner surface of the reel, and two eccentric rollers provided inside the retainer and having guide pins.
The reel set in the retainer is equipped with a cam that is rotatably fitted into the shaft portion of the drive device and guides the guide pin, and a locking means that engages with the cam to stop the cam, and the reel set in the retainer is moved by the eccentric roller. It is characterized by being configured to be fixed. An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is a sectional view of the automatic reel fixing mechanism according to the present invention before the reel is fixed, Fig. 2 is a view taken along the arrow A-A in Fig. 1, and Fig. 3 is the movement of the eccentric roller when the reel is fixed. FIG. 4 is a sectional view of the automatic reel fixing mechanism of the present invention, which is a sectional view taken along the line B--B in FIG. 3.

1 to 4, a shaft 2 of a drive motor 1 is provided with a reel 1 by a guide portion 3b.
A retainer 3, which allows accurate center positioning of the shaft 2, is tightly fitted and rotates integrally with the shaft 2 as the drive motor 1 is driven. Two eccentric rollers 4, 4' are provided inside the retainer 3.
An eccentric cam 5, which is a member constituting the eccentric rollers 4, 4', is rotatably supported inside the retainer 3 by a shaft 6. The outer peripheral wall surface of the eccentric cam 5 is made of rubber 7
When the rubber 7 fixes the reel 13, it contacts and presses the inner wall surface of the reel 13. A guide pin 8 with a roller is provided at the lower end of each of the eccentric rollers 4, 4'. A shaft portion 3 of a retainer 3 is attached to the shaft 2 of the drive motor 1.
A cam 9 having the shape shown in FIGS. 2 and 4 is rotatably fitted through a. The cam 9 is provided with a groove 9a.
a is the acting rod 1 when the solenoid 10 is activated.
1 extends and hits a convex portion 9b provided in the groove 9a to stop the rotation of the cam 9. Accordingly, the solenoid 10 is activated,
When the working rod 11 extends and hits the convex portion 9b provided in the groove 9a, and the rotation of the cam 9 is stopped, the eccentric rollers 4, 4 are rotated by the rotation of the retainer 3, which rotates together with the shaft 2 of the drive motor 1. A guide pin 8 provided at the lower end of the cam 9 traces the contour of the cam 9, and the eccentric roller 4 performs a swinging motion about the shaft 6. Reference numeral 12 is a spring whose action rod 1 is activated when the solenoid 10 is deenergized.
1 is provided for retracting.

The operation of the automatic reel fixing mechanism of the present invention constructed as described above will now be described.

() When fixing the reel Once the reel 13 has been set in the retainer 3 (at this time, the center position of the reel 13 is accurately shown by the guide part 3b of the retainer 3), activate the solenoid 10 to fix it. The working rod 11 is extended into the groove 9a. When the drive motor 1 is rotated in the direction of the arrow in FIG. 2, the retainer 3 and the cam 9 are also rotated in the same direction. Within half a rotation of the drive motor 1, the working rod 11 extending into the groove 9a hits the protrusion 9b provided in the groove 9a (the cam 9 is symmetrical);
The rotation of the cam 9 is stopped. However, the retainer 3 rotates further, and the retainer 3 and the cam 9 perform differential rotation. That is, the retainer 9 further rotates in the direction of the arrow in FIG. 2 with respect to the stopped cam 9. At this time, the guide pins 8 of the eccentric rollers 4, 4' trace the outline CD of the cam 9, so the eccentric rollers 4, 4' are moved outward about the shaft 6, and the rubber of the eccentric rollers 4, 4' The surface 7 protrudes from the notch portion of the retainer 3 as shown in FIGS. 3 and 4, presses the inner surface of the reel 13, and fixes the reel 13. The solenoid 10 is then deenergized and the working rod 11 is retracted by the elastic force of the spring 12.

() To release the fixation of the reel, operate the solenoid 10 and its operating rod 11.
is extended into the groove 9a. When the drive motor 1 is rotated in the direction opposite to the arrow direction in FIG. 4, within half a rotation of the drive motor 1, the working rod 11 extending in the groove 9a hits the protrusion 9b provided in the groove 9a, and the cam is rotated. Stop the rotation of 9. However, the retainer 3 rotates further, and the retainer 3 and the cam 9 perform differential rotation. At this time, the guide pin 8 of the eccentric rollers 4, 4'
traces the contour DC of cam 9, so eccentric roller 4,
4' is moved inward around the shaft 6, so that the surface of the rubber 7 of the eccentric rollers 4, 4' is on the reel 1.
3 and returned to the position shown in FIGS. 1 and 2. The solenoid 10 is then deenergized and the working rod 11 is retracted by the elastic force of the spring 12. Reel 13 which was fixed by this
is released and can be removed from the retainer 3.

In addition, in FIGS. 1 to 4, the moving distance of the eccentric rollers 4, 4' that fix the reel 13 is drawn in a large size, but this is to make the movement easier to understand. In practice, the moving distance of the eccentric rollers 4, 4' is, for example, 2 to 3
The reel 13 can be fixed by about mm.

As explained above, according to the present invention, the number of support points for fixing the reel can be reduced to two, and even if the position of the support points is slightly deviated from the center, the guide part provided on the retainer can be used. Since the reel is precisely positioned,
There is no risk of the center of rotation shifting, and the reel can be automatically fixed. And since it is a two-point supported reel fixing mechanism, the mechanism itself is simplified,
Consequently, the cost of the reel fixing device can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the automatic reel fixing mechanism according to the present invention before the reel is fixed, Fig. 2 is a view taken along the arrow A-A in Fig. 1, and Fig. 3 is the movement of the eccentric roller when the reel is fixed. FIG. 4 is a cross-sectional view of the automatic reel fixing mechanism of the present invention, which illustrates the BB arrow diagram in FIG. 3. In the figure, 1 is a drive motor, 2 is a shaft, 3 is a retainer, 3a is a shaft part, 3b is a guide part, 4 is an eccentric roller, 5 is a cam, 6 is a shaft, 7 is rubber, 8 is a guide pin, 9 is Cam, 9a is groove, 9b is protrusion, 1
0 represents a solenoid, 11 an operating rod, 12 a spring, and 13 a reel.

Claims (1)

[Scope of utility model registration request] a retainer including a guide portion on which the inner surface of the reel is positioned; two eccentric rollers provided inside the retainer and having guide pins; rotatably fitted into the shaft portion of the drive device; An automatic reel fixing device comprising: a cam that guides a guide pin; and a locking means that engages with the cam to stop the cam, and is configured to fix the reel set in the retainer with the eccentric roller. mechanism.