JPH0412035Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a paper sheet conveying roll suitable for use as a paper feed roll for feeding transfer paper of a copying machine toward a copying process, and in particular, relates to a paper sheet conveying roll suitable for feeding transfer paper of a copying machine toward a copying process. The present invention relates to a paper sheet conveyance roll whose peripheral surface portion, which is prone to rubbing and wear, can be easily replaced.

[Prior art]

Traditionally, paper feed rolls used in copying machines, etc., to feed stacks of paper toward the copying process are:
In order to impart a driving force to paper in a stationary state,
A roll is used that has a circumferential surface coated with a material such as rubber that has a high coefficient of friction with the transfer paper, and forcibly sends out the transfer paper using the frictional force. In this case, the peripheral surface member that comes into contact with the transfer paper tends to wear out as the feeding operation is repeated over a long period of time, and it is necessary to replace it with a new member as appropriate during maintenance or the like.

[Problems with conventional technology]

When replacing the peripheral surface member of the paper feed roll, it is extremely troublesome to remove the paper feed roll from the rotating shaft that extends over the entire width of the sheet, and usually only the peripheral surface member is replaced with the main body of the paper feed roll. The method used is to remove the equipment and replace it. However, the circumferential surface member itself is often formed in an endless shape so as to be wrapped around the circumferential surface of the paper feed roll body, and therefore, in this case as well, when replacing the material, it is necessary to pass the long rotating shaft through each time. This is a factor that hinders the efficiency of maintenance work.

[Purpose of invention]

The present invention has been devised in view of the above-mentioned conventional problems, and an object of the present invention is to provide a paper sheet conveying roll that simplifies the work of replacing peripheral members and contributes to improving the efficiency of maintenance work.

[Key points of the idea]

In order to achieve the above object, the present invention has a paper sheet conveying roll that conveys paper sheets such as transfer materials along a predetermined path, and is made of an elastic material with a large coefficient of friction and is formed in an endless shape. a friction member that contacts the paper material to apply a propulsion force; a cylindrical base that is inserted and fixed onto the rotating shaft having a recessed portion; The friction member has an extended flange and an arcuate protrusion that is erected on the flange with a space around the cylindrical base and around which the friction member is wound. a support member that rotatably supports; a support member that is externally inserted onto the rotation shaft and has an engaging portion that can be engaged with a recess of the rotation shaft, and is covered with the support member from the other end side of the cylindrical base; The friction member is equipped with a presser member that prevents the friction member from falling off by engaging the engagement portion with the recess.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing a paper feed roll for a copying machine as an embodiment of the present invention, and FIG. 2 is an elevational view showing the state with the presser removed. Further, FIG. 3 is an exploded perspective view showing the paper feed roll of this example. As is clear from Fig. 2, the peripheral surface of the paper feed roll of this example is not a perfect circle, but has an approximately half-moon shape with a part of the circumference cut out. The period of rubbing against the surface of the transfer paper to be delivered is regularly intermittent, so that the rough feeding timing of the paper during continuous paper feeding is ensured.

In FIG. 3, a pin 1a is provided upright at a predetermined position on the rotating shaft 1 for locking the outer member. Further, a recess 1b is carved around the entire circumference near the pin 1a. This rotating shaft 1 is rotatably supported over the entire width direction of a paper passing path in a paper feeding section of an electrophotographic copying machine.

First, a support member 2, which can also be referred to as the main body of a paper feed roller, is fitted onto the rotation shaft 1 described above. Support member 2
consists of a half-moon-shaped base plate 2a, an arc-shaped protrusion 2b that serves as a support for a friction member to be described later, and a cylindrical boss 2c, and a pair of flat plates sandwiching the boss 2b. It is composed of protrusions 2d and 2e. The arcuate protrusion 2b is erected along the outer periphery of the boss 2c at a position spaced apart from it by a predetermined distance so as to extend over a range of about 180 degrees at the center of rotation in this example (see Fig. 2). reference). An insertion hole 2f for the rotating shaft 1 is bored in the center of the boss 2c (rotation center of the paper feed roller). Insertion hole 2f
A pair of grooves 2g and 2h are formed in the inner circumferential surface of the insertion hole 2f at positions facing each other so as to pass through the entire area in the axial direction of the insertion hole 2f. In this example, at an intermediate position (on the circumferential surface) between the pair of grooves 2g and 2h,
A pin groove 2i is carved. This pin groove 2i
is carved over a predetermined section from the substrate portion 2a side along the axial direction of the insertion hole 2f. As shown in FIG. 1, in this example, the section distance l ₁ is set to be equal to the distance l ₂ from the groove 1b on the rotating shaft 1 to the furthest peripheral surface position of the pin 1a. Therefore, when inserting the support member 2 onto the rotating shaft 1, the pin 1a is accommodated in the pin groove 2i, and the support member 2 is pushed along the pin groove 2i until the pin 1a abuts against the inner wall of the pin groove 2i. The member 2 can be accurately and easily placed at an appropriate position on the rotating shaft 1. Note that in order to easily manufacture the support member 2 having a complicated shape as in this example, it may be molded by injection molding or the like using a resin material with excellent rigidity.

A friction member 3 made of an endless elastic body is wound around the arcuate protrusion 2b of the support member 2. The friction member 3 of this example has an initial coefficient of friction with the paper of 1.0 to 1.3 under a pressing force of about 140 to 260 g.
Low hardness rubber material with great characteristics (Product name:
It is made of Mew Rubber). When attaching the friction member 3 having the shape as shown in FIG. It is only necessary to fit it in, and there is no need to pass the rotating shaft 1 through it. Therefore, the replacement work when replacing the worn friction member 3 becomes extremely easy, which greatly contributes to improving the efficiency of maintenance work.

The support member 2 to which the friction member 3 is attached is equipped with a presser 4 that holds the friction member 3 between the substrate portion 2a and prevents it from falling off. Presser 4 in this example
A pair of mounting rods 4b and 4c are mounted on a substrate 4a formed by injection molding using an elastic resin material and formed in the same shape as the substrate portion 2a of the support member 2.
It is constructed by standing upright. Mounting rods 4b, 4c
A pair of grooves 2 are formed on the inner peripheral surface of the boss 2c of the support member 2 at the periphery of the shaft hole 4d through which the rotating shaft 1 is inserted.
They are erected at positions corresponding to g and 2h, and have hook-shaped engaging portions 4e and 4f formed at their tips, respectively. Also, the length of each prism part of the mounting rods 4b and 4c
l ₃ (see FIG. 1) is set to be equal to the axial length l ₄ of the support member 2. Note that the depth d of the grooves 2g and 2h of the support member 2 is set large enough to allow each of the engaging portions 4e and 4f to freely pass along the extending direction thereof. Therefore, when mounting the presser 4, first insert the rotating shaft 1 into the shaft hole 4d, and then insert the mounting rods 4b and 4c into the grooves 2g and 2h of the support member 2 until the board 4a is attached to the boss. 2c
If the engaging parts 4e and 4f are forcibly pushed in until they come into contact with the tip, at the same time each engaging part 4e, 4f is inserted into the recess 1b of the rotating shaft 1.
It is attached to the shoulder of the person. As a result, the friction member 3 is reliably held and prevented from falling off, and the support member 2 is also prevented from being unintentionally removed in the axial direction opposite to the insertion side, and the entire paper feed roll is moved to the rotating shaft 1.
is securely fixed in place. In addition, when removing the presser 4 in order to replace the friction member 3, as shown in FIG. Insert a tool with a sharp tip and cut the tapered surface T.
Due to the slope effect, each of the engaging portions 4e and 4f can be forcibly lifted out of the recessed portion 1b and easily removed. After the presser 4 has been removed to some extent, the friction member 3 can be easily replaced as described above without removing it from the rotating shaft 1, and therefore the efficiency of maintenance work is further improved.

It should be noted that the present invention is not limited to the specific embodiments described above, and it goes without saying that various modifications can be made within the technical scope of the present invention. For example, as shown in FIG. 4, the heads of the mounting rod engaging parts 4e' and 4f' of the presser 4' are extended by an appropriate length,
A recess 1c' other than the recess 1b' may be formed in a portion of the rotating shaft 1' corresponding to the extended head thereof. In this case, by grasping the extended head H with a suitable tool such as radio pliers and pressing in the direction of the arrow, the engaging parts 4e' and 4f' can be moved into the recessed part 1 by the lever effect using the wall part W as a fulcrum.
The presser 4' can be easily removed by lifting it from inside b'. Further, the present invention is not limited to a semicircular roll for paper feeding, but may be applied to a normal cylindrical roll for conveyance, and the same effect can be obtained in this case as well.

[Effect of idea]

As detailed above, according to the present invention, the friction member attached to the circumferential surface of the roll is formed into an endless shape and is wound around the supporting protrusions erected along the circumferential surface. This allows the friction member to be directly attached and detached without passing through the rotating shaft. Therefore, the work of replacing the circumferential friction member, which is a consumable member, is extremely simplified, and the efficiency of maintenance work is greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a paper feed roll as an embodiment of the present invention, FIG. 2 is an elevational view of the paper feed roll shown in FIG. 1 with the presser 4 removed, and FIG. FIG. 4 is a partial explanatory view showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Rotating shaft, 2...Supporting member, 2b...Circular projection, 3...Friction member, 4...Press tool, 4b,
4c... Mounting rod, 4e, 4f, 4e', 4f'... Engaging portion.

Claims (1)

[Scope of Claim for Utility Model Registration] A paper sheet transport roll that transports paper sheets such as transfer materials along a predetermined path is made of an elastic material with a large coefficient of friction and is formed in an endless shape. a friction member 3 that applies propulsive force by contacting with the rotary shaft 1; a cylindrical base 2c that is externally fixed to the rotary shaft 1 and has a recess 1b; Flange portion 2a extending in the radial direction
and an arcuate protrusion 2b which is erected around the cylindrical base 2c with a gap therebetween and is used to wrap the friction member 3 around the flange 2a. a support member 2 for supporting the rotary shaft 1;
The cylindrical base 2c has engaging parts 4e and 4f that can be engaged with the recessed part 1b, and is mounted on the support member 2 from the other end side of the cylindrical base 2c, and the engaging parts 4e and 4f are engaged with the recessed part 1b. A paper sheet material conveying roll characterized by having a presser 4 that prevents the friction member 3 from falling off by fitting together.