JPS6334093B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device for an information recording apparatus such as a copying machine.

In general, this type of paper feeding device is of a type in which the cut recording paper is placed directly on the paper feeding tray, and a cassette type in which a recording paper cassette containing recording paper is attached to the paper feeding tray. However, from the point of view of convenience in handling, many are of the cassette type.

By the way, in this cassette-type paper feeding device, a separating claw is provided at the front corner of the cassette to separate the recording sheets and take out only the topmost recording sheet, but the structure of the cassette is complicated. Depending on the properties of the recording paper, accidents often occur in which multiple sheets of recording paper are fed at the same time.
Further, in many conventional cassette-type paper feeding devices, it is troublesome to attach and detach the cassette.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a paper feed device for a copying machine, etc., which does not require the use of separation claws that are incomplete in separating recording sheets, allows easy attachment/detachment of cassettes, and allows multiple paper feed trays to be installed. is to obtain.

According to the present invention, the purpose is to provide: A. a paper feed unit that feeds out a large number of stacked sheets one by one; B. a push-up member that pushes up the middle plate of the cassette so as to press the stacked sheets against the paper feed unit; C: a biasing member that biases the push-up member in the push-up direction; D: a cam driven member that follows a cam member provided on the cassette; and E: a transmission mechanism that transmits the movement of the cam driven member to the push-up member. A sheet feeding device main body; a. An intermediate plate that supports stacked sheets and is pushed up by the pushing up member; b. A notch provided in the bottom wall of the cassette so that the pushing up member can enter and exit the cassette; c. During attachment/detachment of the cassette, during the attachment/detachment operation, the push-up member contacts the cam driven member and temporarily resists the biasing force of the biasing member to retract the push-up member to a position where it does not interfere with the insertion/detachment of the cassette. The cam member is disposed on the side of the cassette and has a shape that separates from the cam follower member and pushes the push-up member up by the biasing force of the biasing member when insertion is completed and removal is completed. This is achieved by a paper feeding device such as a copying machine, which is characterized by comprising a cassette having a paper cassette.

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 is used in combination with a pedestal A having a built-in paper feed tray device 1. As shown in FIG. The pedestal A, which can be moved to any location by means of casters 2a, supports the vessel 3 placed on the base 2.
A paper feed tray device 1 is built in to feed the recording paper a one by one to the outlet 4. This paper feed tray device 1 is equipped with a lift 7 that lifts the recording paper a placed on a pallet 5 by a chain 6, and the recording paper a is transferred to a paper feed unit 8 similar to the paper feed unit of the paper feed device described later.
The sheets are fed one by one to the outlet 4 by the.

The electrophotographic copying machine B that can change the copying magnification is of a type in which the position of the lens 10 of the exposure optical system 9 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.
Around the process unit, that is, the charger 1
2, developing device 13, transfer electrode 14, separation electrode 1
5. A cleaning device 16 is installed. Also,
The electrophotographic copying machine B has a paper feeding device C, the details of which will be described later with reference to FIGS. 2 to 4, and a recording paper path 17 is formed between the paper feeding device C and the photosensitive drum 11. In this recording paper path 17, a paper feeding roller 18 is located which feeds the recording paper a supplied from the paper feeding device C or the recording paper a supplied from outside the machine to the photoreceptor drum 11. Therefore, the toner image on the photoreceptor drum 11 is transferred to the recording paper a fed to the photoreceptor drum 11 while passing through the transfer electrode 14, and this recording paper a is transferred to the fixing device 20 by the conveyor belt 19. After the sheet is transported and the toner image is fixed in the fixing device 20, it is taken out of the machine by the action of the sheet discharge roller 21.

2 to 4 show details of the paper feeding device C according to the present invention, in which the paper feeding device C accommodates recording sheets a of different sizes (for example, A size series size or B size series size). Two paper feed trays 23A, 23 to which cassettes 22A, 22B can be attached
It has B. Each paper feed tray 23A, 23B has push-up pieces 26A, 26B that are passed over the side plate frame 24 and fixed to the intermediate portions of horizontal bars 25a, 25b, and each horizontal bar 25a, 25b has a link 27a, 27b at the shaft end.
Tension springs (biasing members) 28a, 28 hung on
It is biased clockwise by b. On the outer surface of the side plate frame 24, the base of a driven lever 30, which has a driven roller (cam driven member) 29 provided at its tip extending into the paper feed tables 23A, 23B, is pivotally supported by a pin 31. A pin 32 placed in the middle of the driven lever 30 is engaged with a long hole 33 pivotally supported in the middle of the links 27a and 27b. Therefore, the recording paper cassettes 22A and 22B are
When inserted into A, 23B, the recording paper cassette 22
The driven roller 29 is pushed down by the cam 34 on the outer surface of the sheets A and 22B, and the push-up pieces 26A and 26B are retreated below the paper feed tables 23A and 23B. After this,
When the recording paper cassettes 22A, 22B are further inserted, the driven roller 29 comes off the cam 34, and the push-up pieces 26A, 26B open the cutouts 36 of the paper feed trays 23A, 23B and the notches 37 of the recording paper cassettes 22A, 22B. The middle plate 38 located through the recording paper cassettes 22A, 22B or the middle plate 7 shown in FIG.
5, flip up the middle plate 38 or the middle plate 7 shown in FIG.
5, the recording paper a placed on each paper feed table 23A, 2
3B.

Details of the paper feed units 39A and 39B are shown in FIGS. 2 and 4, and these paper feed units 39A and 39B are assembled into an inverted "U"-shaped mounting frame 40 that is fixed to the device fixing part. Can be attached. That is,
A main drive shaft 41 and a driven shaft 42 that are parallel to each other are installed on the mounting frame 40, and the driven shaft 42 has a feeding roller 43 that engages with the surface of the recording paper a in the recording paper cassettes 22A, 22B and feeds it out. Fixed. Between the driving pulley 44 on the main driving shaft 41 and the freely rotatable driven pulley 45 on the driven shaft 42,
A belt 46 that takes up the recording paper a from the feeding roller 43
will be handed over. 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 aforementioned paper feed unit 39A,
39B, the electromagnetic clutch 49 at the end of the shaft is shown.
A drive shaft 50, which is selectively rotated by opening and closing the drive shaft, drives the main drive shaft through a coupling 51. The coupling ring 51 also has teeth 52 which, via an intermediate gear 53, drive a gear 54 which rotates the driven shaft 42. Therefore, the recording paper cassette 22 is moved by the feeding roller 43.
The recording paper a fed out from A, 22B is
6, the recording paper a is moved to the position of the fixing member 48, and due to the separating action between the fixing member 48 and the belt 16, only the uppermost recording paper a is moved to the recording paper path 17.
sent to.

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,
The radius is made slightly larger than the radius of the plus belt 46, 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. When the clutch 49 is turned on and the shaft 50 rotates, the paper is first fed by the feed roller 43 and advances between the belt 46 and the fixing member 48. If two or more sheets are fed, only the topmost sheet is fed by the belt 46, and the sheets below it are stopped and placed by the fixing member 48.

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

As shown in FIG. 2, each of the paper feed units 39
Guide plates 55 and 56 for guiding the leading edge of the recording paper a supplied from these units to the recording paper path 17 are located inside the units A and 39B. Partition plate 5
A guide plate 55, which forms a first entrance passage 58 communicating with the recording paper passage 17 between the recording paper passage 17 and guide the leading end of the paper to the recording paper path 17. Similarly, the guide plate 56 that forms the second entrance passage 60 with the partition plate 57 is
It is opposed to the paper feeding unit 39B, and guides the leading edge of the recording paper a fed from the paper feeding unit 39B to the recording paper path 17.

The fuselage bottom wall 6 closest to the tip of the guide plate 56
1, that is, an intake opening 62 is provided in the bottom wall of the machine body 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. Inside this intake opening 62 is an auxiliary guide plate 63 that faces away from the tip 56a of the guide plate 56.
is installed, and this auxiliary guide plate 63 and guide plate 56
An external intake passage 64 that merges with the second inlet passage 60 is formed between the distal end portion 56a.

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

The basic structure of the cassette includes a bottom plate 70, a front wall 71, a rear wall 73, and left and right walls 72 and 74.

The bottom plate 70 has metal middle plates 75a, 75.
b, and when the cassette is installed, this middle plate 75 is pushed up by the push-up piece 26A shown in FIGS. 2 and 3, for example. Reference numeral 82 is a piece of cloth provided at the paper feed port of the intermediate plate 75 to protect the paper feed roller and belt when the paper runs out. Thickened portions 76, 77 are formed at the front of the cassette, and cams 78, 79 similar to cam 34 described above are provided on these thickened portions 76, 77.

The top of the front wall 71 is formed with an inclined surface 80 as clearly shown in FIG.
The recording paper a is effectively guided toward the fixing member 48. For this purpose, a recess 8 for receiving the guide piece 47 is provided on the front surface of the front wall 71.
1 is formed.

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

Since the paper feeding device according to the present invention has the above configuration, the paper feeding unit 39 has a good function of preventing double feeding.
Since the recording paper a is fed and separated by A and 39B, the frequency of overlapping recording paper a being fed is reduced. Further, according to the present invention, the paper feed table 23A,
Since the recording paper cassettes 22A and 22B can be attached and detached from the recording paper cassette 23B in one operation, and the structure of the recording paper cassettes 22A and 22B is simplified, manufacturing costs can be reduced and recording paper can be easily loaded. There is an effect.

[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 copying machine, and Fig. 3 is the relationship between the paper feeding device and the recording paper cassette. FIG. 4 is a cross-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 AA in FIG. FIG. C... Paper feeding device, 22A, 22B... Recording paper cassette, 23A, 23B... Paper feeding stand, 26A, 26B...
Push-up piece, 30... Followed lever, 34... Cam, 38...
Push-up board.

Claims (1)

[Scope of Claims] 1 A. A paper feeding unit that feeds out a large number of stacked sheets one by one; B. A push-up member that pushes up the middle plate of the cassette so as to press the stacked sheets against the paper feeding unit; C. The pusher. A sheet feeder main body having: a biasing member that biases the raising member in the pushing up direction; D a cam driven member that follows a cam member provided on the cassette; and E a transmission mechanism that transmits the movement of the cam driven member to the pushing up member. and (a) an intermediate plate that supports the stacked sheets and is pushed up by the push-up member; b) a notch provided in the bottom wall of the cassette so that the push-up member can enter and exit the cassette; and c) during attachment and detachment of the cassette. During the attachment/detachment operation, the pushing member contacts the cam driven member and temporarily resists the biasing force of the biasing member, and retracts the push-up member to a position where it does not interfere with the insertion/detachment of the cassette, and when the insertion/detachment is completed. and a cassette having a cam member provided on a side of the cassette, the cassette having a shape that separates from the cam driven member and pushes the push-up member up by the biasing force of the biasing member upon completion of attachment and detachment. A paper feeding device for a copying machine, etc., characterized by: