JPH03256944A - Sheet overlap feed inhibiting roller - Google Patents

Abstract

PURPOSE:To prevent intrusion of dust and leakage of lubricant and to lower the cost of a sheet overlap feed inhibiting roller by forming a space between a drive clutch barrel and the outer surface of a driven clutch barrel, and by disposing a cylindrical coil spring in the space. CONSTITUTION:Upon feed of a sheet, when a reverse roller 23 is applied with a load greater than a value set by a torque limiter so that a clutch spring 25 is released, the reverse roller 23 races a boss part 22a of a drive clutch barrel 22 which therefore rotates following the roller 23 in the direction A. Upon overlap feed the load applied to the reverse roller 23 becomes lower than the set value by the torque limiter, and accordingly, the reverse roller 23 is rotated in the direction B so as to return an overlapped sheet. In this phase, since a space 24 in which the clutch spring 25 is disposed is sealed up, lubricant such as oil grease or the like may be charged thereinto as necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a paper double-feed prevention roller that comes into contact with a paper feed roller that feeds paper and prevents paper double-feed.

(Prior Art) FIG. 3 shows a conventional paper feeding device, in which paper 8 loaded in a cassette 10 is sent out by a pickup roller 1 and then fed into a nip portion between a feed roller 2 and a reverse roller 3. The reverse roller 3 is provided with a torque limiter, which will be described later. When feeding one sheet of paper, the reverse roller 3 rotates in the A direction to feed the paper, and when the paper is at a heavy speed, the reverse roller 3 rotates in the B direction. You can return double-fed paper to its original direction.

The feed roller 2 is rotated from the vibration source via an electromagnetic clutch, but after the paper reaches the downstream conveyance section, the electromagnetic clutch is turned on and the feed roller 2 is rotated by the paper.

FIG. 4 is a detailed view of the reverse roller 3 and the torque limiter 13. , 11 is a reverse shaft that constantly rotates in direction B, to which the driving clutch [8313a of the torque limiter 13 is fixed, and the driven clutch body 13b is adjacent to the reverse shaft 1.
The drive clutch body 13a is rotatably supported by the drive clutch body 13a.
A cylindrical clutch spring 13c is wound around the driven clutch body 13b. Driven clutch body 1
3b engages with the hub 3b of the reverse roller 3 at an engaging portion 13d, and an elastic rubber ring 3a is fitted and fixed to the hub 3b. Attach the snap ring 1 to the reverse shaft 11 on the end face of the hub 3b.
It is locked at 2. The clutch spring 13c is wound in a direction that loosens when the reverse roller 3 rotates counterclockwise (direction A in Fig. 1) when viewed from the D direction, so the driven clutch jpH3b becomes relative to the clutch spring 13c under a constant torque. (The clutch spring 13c rotates counterclockwise.) Reverse roller 3
When the clutch spring 13c rotates clockwise (direction B in FIG. 1), the clutch spring 13c is wound in the tightening direction, so the reverse roller 3 rotates in the direction B together with the drive clutch cylinder 13a.

When there is no paper or when feeding one sheet, a load greater than the torque limiter setting is applied to the reverse roller 3, which loosens the clutch spring 13c, idles on the reverse shaft 11, and rotates in the A direction. During double feeding, the load on the reverse roller 3 causes the frictional force between the overlapping sheets to be smaller than when feeding a single sheet, and is less than the torque limiter setting value, so the reverse roller 3
rotates in direction B and returns the double-fed paper to its original position.

The snap ring 12 can be easily removed by hand, allowing the reverse roller 3 and torque limiter 13 to be moved in the axial direction for removal, inspection, and replacement (the reverse roller and torque limiter may wear out or change over time. Therefore, it is necessary to perform regular maintenance.)

(Problems to be Solved by the Invention) In the above-mentioned conventional technology, the reverse roller and the torque limiter are separate, so replacement is complicated. In addition, lubricants such as oil from the torque limiter get on your hands, making them dirty, and since the clutch spring of the torque limiter is exposed, it is easy for dust, dirt, toner, etc. to get in, and the torque value changes over time. (Structure/Operation of the Invention) The present invention aims to solve the above-mentioned problems by making the driven clutch cylinder rotatable at the driving clutch cylinder boss part which is integrated with the active shaft. forming a space between a hub that supports the driving clutch cylinder and the driven clutch cylinder adjacently, is integral with the driven clutch cylinder and has an elastic rubber shaft on the outer periphery, and the outer peripheral surfaces of the driving clutch cylinder and the driven clutch cylinder; It is characterized in that a cylindrical coil spring is housed in the space.

Next, an embodiment of the present invention shown in FIG. 1 will be explained in detail. Reference numeral 21 denotes a reverse shaft, which is integrally engaged with a latch body 22 by a pin or the like. Reference numeral 23 denotes a reverse roller, and an elastic rubber ring 23a is fitted and attached to the outer peripheral surface of the hub 23b. A driven clutch body 23d made of a wear-resistant material is inserted and fixed to the small diameter inner peripheral surface 23c of the hub 23b, and a boss of the active clutch f122 is fixed. The drive clutch body 22 and the driven clutch body 23d are adjacent to each other in a plane, and are rotatably supported by the portion 22a.
A sealed space 24 is formed between the hub 23b of the reverse roller and the large-diameter inner circumferential surface 23e, and a cylindrical coil spring 25 is accommodated therein. 26 is a retaining ring. The clutch spring 25 is formed from a metal wire, but those for low torque may be integrally molded from a resin wire.

Since the space 24 housing the clutch spring 25 is sealed, a lubricant such as oil or grease can be filled therein as required. Further, sealing performance can be further improved by using a seal backing or the like.

The driven clutch body 23d and the hub 23b may be integrally molded from the same material.

The operation is similar to that of the conventional device, and when a single sheet of paper is fed, the reverse roller 23 is subjected to a load exceeding the torque limiter setting value, causing the clutch spring 25 to loosen, and the drive clutch cylinder 22
The boss part 22a rotates in the A direction. During double feeding, the load on the reverse roller 23 becomes smaller than the set value of the torque limiter, so the reverse roller 23 rotates in the direction B to return the double fed sheets to their original positions.

In the above embodiment, when feeding a single sheet, the reverse roller rotates in the same direction as the paper feed roller, and when feeding multiple sheets, it rotates in the opposite direction to return the double feeding roller to its original position. As shown, it may be configured to rotate in the input direction under a certain load or more, or to stand still under a certain load.

(Effects) According to the present invention, the driven clutch cylinder is rotatably supported by the driving clutch cylinder boss integral with the drive shaft, and the driving clutch cylinder and the driven clutch cylinder are adjacent to each other.

A space is formed between the hub, which is integral with the driven clutch cylinder and has an elastic rubber ring on the outer periphery, and the outer peripheral surface of the driving latch cylinder and the driven clutch cylinder, and a cylindrical coil spring is housed in the space, so that the reverse roller The torque limiter and torque limiter are integrated into a compact unit, making replacement extremely simple and easy, and the clutch spring is sealed, preventing dirt and dust from entering.
It is possible to prevent lubricant from flowing out and reduce costs.

[Brief explanation of drawings]

Fig. 1 is a front sectional view of one embodiment of the present invention, Fig. 2 is a front view of another usage example, Fig. 3 is a front view of a conventional paper feeder, and Fig. 4 shows the reverse roller and torque limiter of Fig. 3. FIG. 21... Reverse shaft 22... Drive clutch cylinder 22a... Boss portion 23 of drive clutch cylinder... Reverse roller 23a... Elastic sliding wheel 23b... Hub 23d... Driven clutch cylinder 24... ... Space 25 ... Clutch Spring Patent Roganjin Co., Ltd. Ricoh Figure 1 Figure 3 Figure 2 Figure 4 Figure 73 (1 5D

Claims (2)

[Claims] (1) A hub that rotatably supports the driven clutch cylinder at the driving clutch cylinder boss part integral with the drive shaft, the driving clutch cylinder and the driven clutch cylinder are adjacent to each other, and the hub is integral with the driven clutch cylinder and has an elastic rubber ring on the outer periphery. A space is formed between the outer peripheral surface of the driving clutch cylinder and the driven clutch cylinder, and a cylindrical coil spring is accommodated in the space. (2) The paper double feed prevention roller according to claim 1, wherein the space housing the cylindrical coil spring is sealed.