JPH0412053Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper supply shaft for an apparatus using roll paper.

[Prior art]

Conventionally, the paper supply shaft of an apparatus using roll paper is provided with separate back tension springs and friction springs, resulting in a complex structure and a large number of parts. Furthermore, since the friction surface is not constant depending on the condition of friction, there is a drawback that the back tension varies widely.

[Purpose of the invention] In view of the above-mentioned drawbacks, the present invention simplifies the structure by using a single compression coil spring for both friction and back tension, and also reduces the variation in friction torque by defining the friction surface. Therefore, it is an object of the present invention to propose a paper supply shaft that reduces variations in back tension.

[Structure of the idea]

The present invention provides back tension to the roll paper while at the paper supply shaft, which is the center of rotation.
a fixed shaft supported by a frame of the apparatus; a sleeve rotatably supported by the fixed shaft and supporting the roll paper and rotating together; a fixed sleeve fixed to the fixed shaft; the rotating sleeve; A friction plate fitted to the fixed shaft between the fixed sleeves, and a friction plate provided between the friction plate and the fixed sleeve to press the friction plate against the rotating sleeve in the axial direction to provide a constant friction. It consists of a compression coil spring.

〔Example〕

Hereinafter, the present invention will be explained with reference to an illustrated embodiment. The paper supply shaft is as shown in FIG. 1, and a shaft 3 is unrotatably inserted into grooves formed in frames 1 and 2 on both sides of the apparatus. Furthermore, a friction plate 5 and a sleeve 6 are fitted on one side of the fixed shaft 3.
A support sleeve 7 is fitted on the other side of the fixed shaft 3.

The friction plate 5 is formed with a spring mounting cylindrical portion 5a having approximately the same diameter as the outer diameter of the fixed sleeve 4, and a large diameter cylindrical portion 5b having a felt 8 adhered to the end surface. A compression coil spring 9 whose inner diameter is slightly smaller than the outer diameter of the fixed sleeve 4 and the outer diameter of the cylindrical portion 5a is fitted into the fixed sleeve 4 and the cylindrical portion 5a.

The sleeve 6 has a cylindrical portion 6a having a somewhat smaller diameter than the inner diameter of the roll paper 10 shown in FIG. 2, a flange 6b having a larger diameter, and a third
As shown in the figure, a groove 6c into which the wire spring 11 is fitted is formed. The felt 8 is pressed against one end surface of the cylindrical portion 6a. A ball bearing 12 is fitted between the fixed shaft 3 and the E-ring 1 on the inner diameter of the flange 6b.
It is prevented from falling out at 3.

E-rings 14 are provided at both ends of the support sleeve 7.
15 is fitted and positioned.

The winding direction of the compression coil spring 9 is the roll paper 1.
It is wound in the direction in which it is wound tightly in the unwinding direction of 0.

When the paper supply shaft is configured as described above and the roll paper 10 is fitted into the support sleeve 7 and the sleeve 6, the fixed shaft 3 is removed from the groove and the roll paper 10 is inserted into the paper supply shaft.
It is returned by inserting 0.

When the roll paper 10 is fitted so as to contact the flange 6b of the sleeve 6 as shown in FIG. 4, the roll paper 10 is held from inside by the pressing force of the wire spring 11.

The sleeve 6 is provided with a constant friction in the axial direction by the felt 8 and the compression coil spring 9, and the compression coil spring 9 is wound tightly in the direction in which the roll paper 10 is fed out, so that the sleeve 6 is fitted into the sleeve 6 and the support sleeve 7. When the wound end of the roll paper 10 is pulled out, the compression coil spring 9 is tightened around the outer periphery of the cylindrical portion 5a of the friction plate 5, and the compression coil spring 9 is twisted, and the roll paper 10 is given friction torque and is turned into a sleeve. 6 and felt 8
It is rolled out with a slip. Furthermore, when the roll paper 10 tries to rotate due to inertia force or the like more than the rotational force corresponding to the pulling force, the roll paper 10 receives back tension due to the twisting of the compression coil spring 9, and the roll paper 10 is wound in the opposite direction and becomes slack. does not occur.

With the above configuration, one compression coil spring 9 wound in the rotational direction of the roll paper 10 is connected to the fixed sleeve 4 and the spring mounting cylindrical portion 5a of the friction plate 5.
The structure is simplified because it functions as both a pressure welding friction and a torsional back tension by simply fitting it onto the outer periphery of each sleeve, and the friction surface is limited to the end surface of the sleeve 6 and the surface of the felt 8. The frictional force is stabilized.

In the above explanation, the compression coil spring 9 is replaced by the roll paper 10.
However, the winding direction of the compression coil spring 9 does not have to be the rotation direction of the roll paper 10 if both ends of the spring 9 are fixed to the fixed sleeve 4 and the cylindrical portion 5a of the friction plate 5, respectively.

[Effect of idea]

Since the present invention is constructed as described above, a single compression coil spring provides friction and back tension to the rotation of the roll paper, simplifying the structure, reducing the number of parts, and limiting the friction surface. It is possible to provide a paper supply shaft that has excellent practical effects such as stable frictional force.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of the paper supply shaft, Fig. 2 is a perspective view of the roll paper, Fig. 3 is a perspective view of the sleeve, and Fig. 4 is the paper supply shaft. FIG. 3 is a side view of the roll paper attached to the shaft. 1, 2... Frame, 3... Fixed shaft, 4... Fixed sleeve, 5... Friction plate, 6... Sleeve, 9... Compression coil spring, 10... Roll paper.

Claims (1)

[Scope of utility model registration request] A fixed shaft supported by the frame of the device is attached to the paper supply shaft which provides back tension to the roll paper and is the center of rotation thereof, and a fixed shaft rotatably supported by the fixed shaft supports the roll paper and rotates together with the paper supply shaft. a sleeve, a fixed sleeve fixed to the fixed shaft, a friction plate fitted to the fixed shaft between the rotating sleeve and the fixed sleeve, and a friction plate provided between the friction plate and the fixed sleeve. and a compression coil spring that presses a friction plate against the rotating sleeve in the axial direction to provide a constant friction.