JPH0256328A - Sheet feeding cassette - Google Patents

Abstract

PURPOSE:To reduce a feeding frequency of overlapped recording papers by providing an intermediate plate on the bottom plate of a sheet feeding cassette, and moreover providing cams on both sides of the sheet feeding cassette. CONSTITUTION:When a recording paper cassette 22B is inserted, a driven roller 29 is slipped out from a cam 34, pushing up pieces 26A and 26B pass through the incision part 36 of sheet feeding bases 23A and 23B and the notch 37 of the cassette 22B to jump an intermediate plate 38 up located in the inside of the cassette 22B, and recording papers placed on the plate 38 are pressed against sheet feeding units provided on each base 23A and 23B. Consequently, the feeding of overlapped recording papers is surely prevented, and the attaching and detaching of the cassette 22B can be made by one operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feed cassette for an information recording apparatus such as a copying machine.

[Background of the invention]

In general, this type of paper feeding device is divided into two types: one in which the cut recording paper is placed directly on the paper feeding tray, and the other in which a recording paper cassette containing the recording paper is attached to the paper feeding tray. However, most of them are cassette type for convenience of handling.

[Problem that the invention seeks to solve]

By the way, in this cassette-type paper feeding device, a separating claw is installed at the front corner of the cassette.
The structure of the cassette becomes complex, and depending on the properties of the recording paper, accidents often occur in which multiple sheets of recording paper are fed simultaneously. Further, in many conventional cassette-type paper feeding devices, it is troublesome to attach and detach the cassette.

[Means for solving problems]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the need to use a separation claw that does not completely separate the recording paper, and to simplify the operation of attaching and detaching the cassette.
To obtain a paper feed cassette for copying machines, etc.

According to the present invention, this purpose is to provide a paper feed cassette that stores a large number of stacked sheets and sequentially feeds the uppermost sheet to a recording device using a paper feed unit.Cams are provided on both sides of the paper feed cassette. This is achieved by a paper feed cassette characterized by the following.

〔Example〕

Embodiments of the invention will now be described in detail with reference to the drawings.

FIG. 1 is an overall view of an electrophotographic copying machine B according to the present invention, which has a built-in sheet feeding table device l and is used together with a gantry A. The pedestal A, which can be moved to any location by means of casters 2a, has a built-in paper feeder (ITL) that feeds the recording paper a in the vessel 3, which is loaded at 1tcrit, to the outlet 4 one by one on the base 2. A paper feed tray device l receives recording paper a placed on a pallet 5.
A lift 7 is provided to raise the recording paper a by a stopper 6, and a paper feed unit 8 similar to a paper feed unit of a paper feed device to be described later supplies the recording paper a to the outlet 4 one by one.

The electrophotographic copying machine B that can change the copying magnification is of a type in which the position of the lens 1O of the exposure optical system 9 can be changed and the scanning speed of the exposure optical system 9 can be changed in accordance with the copying magnification. The electrophotographic copying machine B has a built-in photosensitive drum 11, and around the photosensitive drum 11 are a process unit, that is, a charger 12, a developing device 13, a transfer electrode 14, and a separation electrode 1.
5. A cleaning device 16 is installed. Further, the electrophotographic copying machine B has a paper feeder C, the details of which will be described later with reference to FIGS. 2 to 4.
A recording paper path 17 is formed between the two. In this recording paper path 17, the recording paper a supplied from the paper feeder C or the recording paper a supplied from outside is fed to the photoreceptor drum. The paper feed roller 18 that feeds paper is located at (2). Therefore, the recording paper a supplied to the photoreceptor drum ll has a transfer voltage of 14
The toner image on the photosensitive drum 11 is transferred while passing through the recording paper a, and the recording paper a is transferred to the fixing device 20 by the conveyor bell 1-19, and after the toner image is fixed in the fixing device 20,
5. The paper is taken out of the machine by the action of the discharge roller 21. .

2 to 4 show the details of the paper feeding device C according to the present invention, and the paper feeding device C is used for recording paper a of different sizes (for example, A
2 to which recording paper cassettes 22A and 22B can be attached, which accommodate paper size (print series size or B plate series size).
It has basic paper feed trays 23A and 23B. Each paper feed tray 23A
, 23B are passed to the side plate frame 24 and the horizontal bars 25a,
Each horizontal bar 25a, 25b has a link 27a, 27a at the end of the shaft.
Tension springs (biasing members) 28a, 28 hung on 27b
b is biased clockwise. The side plate frame 24
The base of a driven lever 30 with a driven roller (cam driven member) 29 provided at its tip protruding into the paper feed trays 23A and 23B is pivotally supported by a pin 31 on the outer surface of the driven lever 30. The pin 32 planted in the middle part is the link 27
It is engaged with an elongated hole 33 pivotally supported in the middle part of a and 27b.

Therefore, when the recording paper cassettes 22A and 22B are inserted into the paper feed trays 23A and 23B, the recording paper cassette 22
The driven roller 29 is driven by the cam 34 on the outer surface of A and 22B.
is pressed down, and the push-up pieces 26A and 26B are pressed down to the paper feed tray 23A.
, 23B. After that, when the recording paper cassettes 22A and 23B are further inserted, the driven roller 29 is removed from the cam 34, and the push-up pieces 26A and 26B are connected to the cutouts 36 of the paper feed trays 23A and 23B and the recording paper cassette 2.
Recording paper cassette 2 passes through the notches 37 of 2A and 22B.
2A, 22B or the middle plate 75 shown in FIG. 5 is flipped up, and the recording paper a placed on the middle plate 38 is transferred to the paper feed unit attached to each paper feed stand 23A, 23B. 39A and 39B.

Details of the paper feed units 1-39A and 39B are shown in FIGS. 2 and 4, and these paper feed units 39A.

39B is attached to an inverted "U"-shaped mounting frame 40 that is fixed to the device fixing part. That is, a main driving shaft 41 and a driven shaft 42 which are parallel to the force are installed on the mounting frame 40, and the driven shaft 4
A feeding roller 43 that engages with the surface of the recording paper a in the recording paper cassettes 22A and 22B and feeds it out is fixed to the recording paper cassettes 22A and 22B. A bell 1-46 for taking up the recording paper a from the feeding roller 43 is hung between a drive pulley 44 on the main drive shaft 41 and a freely rotatable driven pulley 45 on the driven shaft 42. A cylindrical fixing member 48 provided with a guide piece 47 is pressed into contact with the intermediate portion of the belt 46 . FIG. 4 shows the drive section of the paper feed units 39A and 39B, in which a drive shaft 50 selectively rotated by opening and closing of an electromagnetic clutch 49 at the end of the shaft drives the main drive shaft via a coupling 51. Further, the coupling 51 has a toothed portion 52, and this toothed portion 52 drives a gear 54 that rotates the driven shaft 42 via an intermediate gear 53. Therefore, the recording paper a fed out from the recording paper cassettes 22A and 22B by the feeding roller 43 is moved to the position of the fixing member 48 by the movement of the belt 46, and due to the separating action between the fixing member 48 and the belt 46, Only the recording paper a is sent to the recording paper path 17.

To explain in detail the paper feeding function of the paper feeding unit 39A, the radius of the feeding roller 43 is determined by the driven pulley 45 and the plus belt 4.
6 as shown in FIG. The feeding roller 43, the belt 46, and the fixing member 48 are made of a material with a large coefficient of friction, such as rubber. clutch 4
When the shaft 50 rotates due to turning on of 9, the feeding roller 43 first rotates.
The paper is fed between the belt 46 and the fixing member 48. If two or more sheets of paper are fed, only the top one is fed by the belt 46, and the paper below it is fed by the fixing member 48.
It will be stopped by.

Therefore, only the top paper is sent by the belt 46 and advances to the guide plate 55.

As shown in FIG. 2, each of the paper feeding units 39A.

39B, there is a guide plate 55 for guiding the leading edge of the recording paper a supplied from these units to the recording paper path 17.
．． 56 is located. The guide plate 55, which forms a first entrance passage 58 communicating with the recording paper passage 17 between it and the partition plate 57, is opposed to the paper feeding unit 39A, and records sent from the paper feeding unit 39A are The leading edge of the paper a is guided to the recording paper path 17. Similarly, the guide plate 56 that forms the second entrance passage 60 with the partition plate 57 is opposed to the paper feed unit 39B.
The leading edge of the recording paper a fed from the recording paper path 17 is guided to the recording paper path 17.

The bottom of the aircraft is closest to the tip of the guide plate 56! ! ! 61,
That is, an intake opening 62 is provided in the bottom wall of the machine that meets the outlet 4 of the above-mentioned gantry A, through which the recording paper a can be taken into the electrophotographic copying machine B from the outside.
An auxiliary guide plate 63 is installed inside the guide plate 56 to be spaced apart from and opposite to the tip 56a of the guide plate 56, and joins the second entrance passage 60 between the auxiliary guide plate 63 and the tip 56a of the guide plate 56. External intake passages 6 and 4 are formed.

FIG. 5 shows a cassette suitable for use in the paper feeder of the present invention.

The cassette has a bottom plate 70, a front wall 71, a rear wall 73, and left and right walls 72.
The basic configuration is ゜74.

The bottom plate 70 has metallic intermediate plates 75a, 7
5b, and this push-up plate 75 is supported by the push-up piece 26A in FIGS. 2 and 3, for example, when the cassette is installed.
is pushed up. Reference numeral 82 is a cloth piece provided at the paper feed port of the middle plate 75 to protect the paper feed roller and belt when the paper is running low. At the front of the cassette is a thick section 76.
77 is formed, and cams 78 and 79 similar to the aforementioned cam 34 are provided in this thick portion 76 and 77.

The top of the front wall 71 has an inclined surface 8 as shown clearly in FIG.
0 is formed, and this surface 80 is aligned with the upper surface of the above-mentioned guide piece 47 when the cassette is mounted on the paper feed table, and effectively guides the recording paper a toward the fixing member 48. For this purpose, a recess 81 for receiving the guide piece 47 is formed on the front surface of the front wall 71.

In the above embodiment, the recording paper a is introduced into the electrophotographic copying machine B from the outlet 4 of the gantry A, but it is also possible to connect another external feeding device to the intake opening 62. It is obvious that it is good.

〔Effect of the invention〕

Since the paper feeding device according to the present invention has the above-described configuration, the paper feeding unit 39A has a good function of preventing double feeding.

Since the recording paper a is fed and separated at 39B, the degree of bottleness in which the recording paper a is overlapped and fed is reduced.

Further, according to the present invention, the recording paper cassettes 22A, 23B can be attached and detached from the paper feed trays 23A, 23B in one operation, and the structure of the recording paper cassettes 22A, 23B is simplified, thereby reducing manufacturing costs. This has the effect of making it easier to load a cassette for recording paper.

[Brief explanation of the drawing]

Fig. 1 is an overall sectional view of an electrophotographic copying machine to which the present invention is applied, Fig. 2 is an enlarged sectional view of the paper feeding device of the same copying machine, and Fig. 3 is the relationship between the paper feeding device and the recording paper cassette. FIG. 4 is a sectional view of the paper feeding unit drive section, FIG. 5 is a perspective view of a cassette suitable for the paper feeding device of the present invention, and FIG. 6 is taken along line A-A in FIG. 5. FIG. C... Paper feeding device, 22A, 22B... Recording paper cassette, 23A, 23B... Paper feeding stand, 26A,
26B... Push-up piece, 30... Followed lever 34,
76.78...cam, 38...middle plate.

Claims (1)

[Claims] 1) A paper feed cassette that stores a large number of stacked sheets and sequentially feeds the uppermost sheet to a recording device using a paper feed unit, the paper feed cassette having a bottom plate, a front wall, A paper feed cassette comprising a rear wall and left and right walls, an intermediate plate provided on a bottom plate, and cams provided on both sides of the paper feed cassette.