JPH0683648U - Paper feed roller cover device - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a cover device for a paper feed roller that is easy to stack paper on a pressing plate, and is inexpensive and downsized. A cover device for a paper feed roller according to the present invention has a paper feed roller cover 25 which covers the outer surface of the paper feed roller 15 and can be opened and closed with respect to the paper feed roller 15. When the paper feed roller cover 25 is released, the pressing plate 17 retracts, and the pressing plate is locked by the cutout portion 27a and the protruding portion 22 so that the stacked sheets can be easily placed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention protects a paper feed roller provided in a paper feed unit of a paper processing apparatus such as a printer or a copying machine or a paper feed unit of a paper feeding apparatus attached to or detached from the paper processing apparatus from external light. The present invention relates to a cover device for a paper roller.

[0002]

[Prior art]

 As the paper separation technology adopted in the above-mentioned paper processing apparatus and the like, there are known ones that utilize the rigidity of the paper (corner claw system) and ones that utilize friction (friction pad system). In all of these sheet separation techniques, stacked sheets are brought into contact with and biased by a pressing plate against a sheet feeding roller, and the stacked sheets are separated by rotation of the sheet feeding roller. The paper feed roller must generate sufficient frictional resistance with the abutting papers so that the stacked papers are separated and fed out. Therefore, the paper feed roller is usually made of a rubber material having a large friction coefficient.

However, with the passage of time, the surface of the paper feed roller gradually deteriorates due to changes in the surrounding environment such as ozone, ultraviolet rays, and humidity, and the friction coefficient decreases. As a result, if the number of days of use increases, it becomes difficult to accurately separate the laminated paper.

In order to solve this problem, Japanese Utility Model Laid-Open No. 2-69633 discloses a technique in which a cover is provided on a portion of the sheet feeding roller that receives light to prevent deterioration of the sheet feeding roller. There is. The paper feed roller cover device disclosed in this publication holds a posture by engaging a part of the cover with a shaft of the paper feed roller or a fixed bracket, and holds the posture of the paper feed roller at a portion not covered by the cover. The lower part is configured to separate the stacked sheets.

[0005]

[Problems to be solved by the device]

 However, according to the conventional technique disclosed in the above publication, the cover is fixed to the paper feed roller shaft or the fixed bracket, so that the cover obstructs when the paper is placed on the pressing plate, and the placing operation is prevented. Making it difficult. Further, accompanying this, problems such as the leading edge of the sheet being folded back may occur.

Further, it is necessary to form a cover fixing portion for fixing the cover to the sheet feeding roller shaft or the fixing bracket, which causes problems such as an increase in cost and an increase in size of the apparatus.

The present invention has been made to solve the above problems, and provides an inexpensive and downsized cover device for a paper feed roller, in which papers can be easily stacked on a pressing plate. With the goal.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a paper feed roller cover device according to the present invention covers an outer surface of a paper feed roller, a cover that can be opened and closed with respect to the paper feed roller, and a stack of sheets. A pressing plate that is placed and presses the stacked laminated sheets toward the paper feed roller, and a pressing plate that is provided on the cover and that retracts when the cover is released against the paper feed roller. And locking means for locking.

[0009]

[Action]

 In addition to covering the outer surface of the paper feed roller, a cover that can be opened and closed with respect to the paper feed roller is provided. When the cover is released, the pressing plate is retracted and locked so that the stacked sheets can be easily placed on the pressing plate.

[0010]

【Example】

 Hereinafter, an embodiment of the present invention will be specifically described with reference to the accompanying drawings. In this embodiment, a paper feed roller cover is provided in a paper feed device that is attached to and detached from a printer which is a paper processing device.

FIG. 1 is a plan view showing a sheet feeding device 10 loaded in a printer. The paper feeding device 10 has a paper feeding roller shaft 13 rotatably supported by a frame 11 and driven by a drive motor (not shown) on the printer 1 side. A paper feed roller 15 is fixed to the paper. A paper feed roller cover 25 described later is rotatably held on the paper feed roller shaft 13. The frame 11 is provided with a pressing plate 17 on which laminated paper is placed, and the sheets stacked on the pressing plate 17 are defined on both sides by a pair of guide plates 19. Further, the pressing plate 17 is provided with a supporter 21 extending substantially at right angles to the paper feeding roller shaft 13 and supports the rear end portion of the laminated paper placed on the pressing plate 17.

FIG. 2 is an enlarged perspective view of the main part of the paper feeding device shown in FIG. 1, and shows the details of the cover device for the paper feeding roller according to the present invention. The pressing plate 17 is urged toward the paper feeding roller 15 by a pressing plate urging member 20 arranged between the pressing plate 17 and a bottom plate 18 provided on the frame of the paper feeding device. A projecting portion 22 extending parallel to the paper feeding roller shaft 13 is provided at the tip of the pressing plate 17, and is adapted to engage with the paper feeding roller cover 25. Note that in this figure, the guide member provided on the pressing plate 17 is omitted.

A paper feed roller cover 25 that protects the paper feed roller 15 from ultraviolet rays and moisture is rotatably held on the paper feed roller shaft 13. The paper feed roller cover 25 is formed with a pair of release levers 26, which are rotated with respect to the paper feed roller shaft 13 by operating the release levers 26 in the directions of the arrows. The paper feed roller cover 25 is formed with a cam surface 27 with which the projection 22 provided at the tip of the pressing plate 17 engages, and the projection 22 is operated by operating the release lever 26 in the direction of the arrow. Slides on the cam surface 27, and the pressing plate 17 is pushed down. Further, a cutout portion (locking portion) 27a is formed at the lower end of the cam surface 27, and when the release lever 26 is rotated in the arrow direction to open the paper feed roller cover 25, The protruding portion 22 is adapted to be locked in the cutout portion 27a.

When the protruding portion 22 is locked in the cutout portion 27 a, the paper feed roller cover 25 is opened, and the pressing plate 17 resists the urging force of the pressing plate urging member 20 to prevent the laminated paper from being stacked. It is retracted and locked so that it can be easily placed (in this embodiment, it is locked at the maximum retracted position). Then, when the release lever 26 is operated to return the paper feed roller cover 25 to the closed state, the protrusion 22 is disengaged from the notch 27a.

Next, the operation of the cover device for the paper feed roller will be described with reference to FIGS. 3 and 4. Initially, no paper is placed on the pressing plate 17, and the paper feed roller cover 25 is closed. When a sheet is placed on the pressing plate 17 in this state, the release lever 26 is rotated in the arrow direction. With this rotation operation, the paper feed roller cover 25 is gradually released, and the pressing plate 17 is pushed down by the action of the protrusion 22 and the cam surface 27 against the biasing force. By locking the protrusion 22 with the notch 27a formed in the cam surface 27, the paper feed roller cover 25 is held in the released state and the pressing plate 17 is at the maximum, as shown in FIG. Locked in the retracted position. In this state, the stacked sheets are placed on the pressing plate 17. As shown in FIG. 4, the space between the pressing plate 17 and the paper feed roller cover 25 is widely opened, so that the stacked sheets can be easily placed on the pressing plate.

After the stacked sheets are placed on the pressing plate 17, the release lever 25 is returned to the original position so that the protruding portion 22 is removed from the cutout portion 27a and the paper feed roller cover 25 is closed. At this time, the locked state of the pressing plate 17 is released, and the stacked sheets placed on the pressing plate are abutted and urged by the pressing plate urging member 20 against the sheet feeding roller 15. The sheet placed on the pressing plate is fed out by the sheet feed roller 15, separated into one sheet between the sheet feed roller 15 and the sheet separation pad 30, and conveyed to the printer side.

Although the embodiment of the present invention has been described above, the present invention can be configured in the same manner in a paper feeding section of a paper processing apparatus such as a printer. Further, the means for retracting and locking the pressing plate at the same time as releasing the paper feed roller cover can be variously modified other than the cam surface having the shape shown in the drawing.

[0018]

[Effect of device]

 According to the present invention, the paper feed roller cover can be opened and closed, and the pressing plate retracts at the same time when the paper feed roller cover is released, so that the stacked sheets can be easily placed on the pressing plate. Further, since it is not necessary to provide a member for fixing the paper feed roller cover, it is possible to provide an inexpensive and downsized paper feed roller cover device.

[Brief description of drawings]

FIG. 1 is a plan view showing a sheet feeding device loaded in a printer.

FIG. 2 is an enlarged perspective view of a main part of the paper feeding device shown in FIG. 1, showing a cover device for a paper feeding roller according to the present invention.

FIG. 3 is a side view when the paper feed roller cover is in a closed state.

FIG. 4 is a side view when the paper feed roller cover is in an open state.

[Explanation of symbols]

13 ... Paper feed roller shaft, 15 ... Paper feed roller, 17 ... Press plate, 20 ... Press plate urging member, 22 ... Projection part, 25 ... Paper feed roller cover, 27 ... Cam surface.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location G03G 15/00 109

Claims (1)

[Scope of utility model registration request] 1. A cover that covers the outer surface of a paper feed roller and that is openable and closable with respect to the paper feed roller, and stacks the stacked papers, and directs the stacked papers that have been mounted toward the paper feed roller. A sheet feeding roller comprising: a pressing plate that presses; and a locking unit that is provided on the cover and that retracts and locks the pressing plate when the cover is released from the sheet feeding roller. Cover device.