JP2710168B2 - Sheet material feeding device - Google Patents

Sheet material feeding device

Info

Publication number
JP2710168B2
JP2710168B2 JP2176747A JP17674790A JP2710168B2 JP 2710168 B2 JP2710168 B2 JP 2710168B2 JP 2176747 A JP2176747 A JP 2176747A JP 17674790 A JP17674790 A JP 17674790A JP 2710168 B2 JP2710168 B2 JP 2710168B2
Authority
JP
Japan
Prior art keywords
cassette
sheet
main body
guide
sheet material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2176747A
Other languages
Japanese (ja)
Other versions
JPH0464533A (en
Inventor
均 石浜
龍一 稲葉
一夫 竹内
豊 菊池
Original Assignee
キヤノン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by キヤノン株式会社 filed Critical キヤノン株式会社
Priority to JP2176747A priority Critical patent/JP2710168B2/en
Priority claimed from US07/724,882 external-priority patent/US5201873A/en
Publication of JPH0464533A publication Critical patent/JPH0464533A/en
Application granted granted Critical
Publication of JP2710168B2 publication Critical patent/JP2710168B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

Description: BACKGROUND OF THE INVENTION (a) Industrial Field of the Invention The present invention relates to a sheet material feeding apparatus of a paper cassette detachable type in an image forming apparatus such as a laser beam printer and a copying machine.

2. Description of the Related Art Conventionally, a sheet material feeding apparatus in which a sheet cassette accommodating sheet materials in a main body frame of an image forming apparatus is detachable is a sheet cassette or a cassette fixed to a main body apparatus. A guide is provided, and the sheet material in the paper feed cassette is fed to the main body device by the cassette guide to form an image.

(C) Problems to be Solved by the Invention However, in the conventional apparatus, the sheet cassette having the fixed cassette guide needs to have a height up to the sheet conveying path of the main unit. In the case of attachment and detachment, there has been a problem that the entrance and exit of the cassette guide need not be interfered with the main unit, so that the overall configuration of the main unit becomes high.

In view of the above, the present invention can reduce the height of the overall configuration of the apparatus by making the above-mentioned cassette guide movable in the vertical direction, making the entrance of the paper feed cassette of the main unit approximately equal to the height of the feed opening. It is an object of the present invention to provide a sheet material feeding device which achieves the above.

(D) Means for Solving the Problems According to the invention according to claim 1, the sheet material fed by the sheet feeding means is accommodated and detachably provided below the main unit having a sheet conveying path at a lower portion. In the sheet material feeding device having a cassette, when the cassette is mounted on the main device, the feeding route is protruded and maintained in the sheet conveying path by elastic force in a direction protruding toward the main device. When the cassette is attached to or detached from the main unit, the cassette is provided with a cassette guide which is pushed down by a member on the main unit side and retracts to a position where the cassette can be attached and detached against an elastic force. .

According to a second aspect of the present invention, the cassette guide has a front end protruding into the sheet conveying path of the main body device by the elastic force of the spring, the protruding front end portion has a slope, and the cassette guide to the main body device is provided. At the time of attachment / detachment, the slope is pressed by a member on the main body device side and retracts to a position where the cassette can be attached / detached against the elastic force of the spring.

According to a third aspect of the present invention, the cassette guide itself is an elastic member, and when the cassette is attached to or detached from the main unit, the cassette guide is pressed by a member on the main unit side, and the cassette guide is opposed to the elastic force of the cassette guide itself. It is characterized by retreating to a removable position.

(E) Operation Based on the above configuration, in a state where the detachable cassette is mounted on the main body device, the cassette guide provided on the cassette uses the elastic force provided on the cassette to cause the sheet conveyance path on the main body side. Into the feed path,
The sheet material fed by the sheet feeding means is guided to the sheet conveying path through the above-mentioned feeding path.

When the cassette is advanced or retracted with respect to the main unit in order to attach or detach the cassette to or from the main unit, the cassette guide which has protruded toward the main unit is pressed by the member on the main unit side to resist the elastic force. To the cassette guide side, and the cassette becomes detachable.

(F) Example Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional side view of a laser beam printer (main body device) 1 to which a first embodiment of the present invention is applied. In FIG. 1, the right side is the front side of the laser beam printer 1. I have.

The laser beam printer 1 has a main body frame 2 and a printer front plate 5 whose base is pivotally connected by a hinge shaft 3 and which can be freely opened and closed. A process cartridge 6 as an image forming unit is provided in the exterior body 2. The process cartridge 6 includes a photosensitive drum 7 rotating in the direction of the arrow, a primary charger 9 for uniformly charging the photosensitive drum 7, a developing device 10, and a cleaner 11 including a cleaning blade 11a. The developing device 10 includes a developing sleeve 12, a developing container 10 a containing a toner 13, and the like.

The photosensitive drum 7 of the process cartridge 6 is exposed to the laser beam L passing through an opening 6b formed in the outer cover 6a of the process cartridge 6, and a latent image is formed. Laser scanner for irradiating the laser beam L
15 is the scanner motor 16, polygon mirror 17, lens 19
The laser scanner 15 exposes the photosensitive drum 7 by irradiating a laser beam L corresponding to image information input from an external host computer (not shown) or the like. When the process cartridge 6 is mounted in the laser beam printer 1, the mechanical drive system and the electric circuit system of the process cartridge 6 and the laser beam printer 1 are connected.

The printer front plate 5, the first paper feed tray 20 is a sheet feeding portion is freely mounted a plurality of sheet materials P 1 have the loading detachable, on its downstream side, the sheet material P 1 And a separation pad 22 for separating the sheet material P1 one by one. Between the paper feed roller 21 and the registration roller pair 23 disposed downstream thereof, the first sheet conveying path 25 for guiding the sheet P 1
Are arranged.

On the other hand, paper feed cassette 26 is a second sheet feeding portion, a pressing plate 29 or the like which urges the front portion of the middle plate 27 and the intermediate plate 27 to the sheet material P 2 are stacked upward This pressing plate 29
The elasticity of the extension spring 30 gives the clockwise rotation behavior in the figure. The aforementioned sheet P 1, the sheet feeding roller 31 is in contact with the sheet material P 1 of the uppermost separation claw 32
The sheet is fed to the second sheet conveying path 33 by the sheet feeding roller 31 rotating in the direction of the arrow while being separated.

A cassette guide 35 is provided between the paper feed roller 31 and the second sheet transport path 33 so as to be vertically movable in the paper feed cassette 26. The cassette guide 35 has substantially the same length as the width direction of the sheet material in plan view. The cassette guide 35 is urged upward by the elastic force of the compression spring 36, and its upper portion 35a extends into the main body frame 2. A feed path 4 is formed by which the sheet material P 1 fed from the sheet feed cassette 26 is connected to the second sheet transport path 33 by the cassette guide 35.
The sheet cassette 26 can be moved in and out of the main body frame 2 in the X and Y directions.

The second sheet conveying path 33 and the registration roller pair 23
At the junction 40. A sheet conveyance path 41 that guides sheets from a sheet cassette (not shown) that is additionally provided below the sheet cassette 26 also joins the junction 40. A paper guide member 43 for switching between the first sheet conveying path 25 and the second sheet conveying path 33 and the sheet conveying path 41 is rotatably provided at the merging section 40.

A transfer roller 45 for transferring a toner image onto the sheet material P 1 (P 2 ) by pressing the sheet material P 1 (P 2 ) conveyed by the registration roller pair 23 against the photosensitive drum 7 is applied to the photosensitive drum 7.
Are arranged. On the downstream side of the transfer roller 45, a guide plate 47 for guiding the sheet material P 1 (P 2 ) after transfer to the fixing device 46, a paper guide member 50 fixed to a lower portion of the fixing frame 49, and the like are provided. I have. The fixing device 46 includes a fixing heating roller.
A fixing roller 46b presses the sheet material P 1 (P 2 ) against the fixing device 46.

Downstream of the fixing device 46, a fixing guide 52 provided on the printer front plate 5, a paper ejection guide 53 provided on the main body frame 2 side, and the like are sequentially arranged. Furthermore, the paper ejection guide 53
A discharge roller group 57 composed of a discharge roller 55 and a plurality of discharge rollers 56 that are in pressure contact with the discharge roller 55 is disposed downstream of the sheet material P. The sheet material P discharged by the discharge roller group 57
1 (P 2 ) is stacked on the discharge tray 59.

The sheet material P 1 (P 2 ) in either the sheet tray 20 or the sheet cassette 26 is fed according to a printer command input to the laser beam printer (main unit) 1, and the fed sheet material P 1 ( P 2 ) passes through the merging section 40 to the registration roller pair 23
The photosensitive drum 7 at a predetermined timing.
And the toner image is transferred. Sheet material after transfer
After fixing by P 1 (P 2 ) by the fixing device 46, a fixing guide
The paper is discharged onto a paper discharge tray 59 by a paper discharge roller group 57 via a paper discharge guide 53.

In the paper feed during the sheet P 2 by the paper feed roller 31, the sheet material P 2 fed from the paper feed cassette 26 is guided to the cassette guide 35 with the sheet cassette 26, the body frame 2 pre-registration guide The sheet is guided to a sheet conveying path 33 formed by 37. The top 35a of the cassette guide 35 is configured in a state higher than the lower end of the pre-registration guide 37, the second at the tip of the sheet material P 2 when thereby passing through the path 4 feeding a sheet material P 2 trigger formed loop P 0 as shown in the figure are made. Tip sheet P 2, which looped is, the tip by having resilient force of the sheet P 2 can be rush uniformly along the transfer roller 45.

FIG. 3 shows the state of the cassette guide 35 when the paper feed cassette 26 is pulled out in the X direction.

As described above with reference to FIG. 2, the upper portion of the cassette guide 35 is located at a position higher than the lower end portion of the registration front guide 37.
When the sheet cassette 26 moves in the X direction, the slope 35a is pushed down by the lower portions 2a and 37 of the main body frame 2 and retreats. As a result, the cassette guide 35 can pass through the front guide 37 and the bottom of the main body frame 2, and when the paper feed cassette 26 moves in the X direction, the cassette guide 35 and the main body frame 2 are moved.
Interference with is avoided. In addition, Y
When the cassette guide 35 is inserted in the same direction, the cassette guide 35 is similarly moved downward, so that interference with the main body frame 2 and the registration front guide 37 does not occur.

FIG. 4 shows a second embodiment of the sheet feeding apparatus of the present invention.

An elastic member 39 is provided at a position of the paper feed cassette 26 where the cassette guide 35 is provided.
The upper part of 39 extends into the body frame 2 and feed path 4
Is formed. Sheet P 2 to be fed by the feeding roller 31 is fed is guided to the sheet conveying path 33 to the registration roller pair 23 by the elastic member 39. The paper cassette 26
When the elastic member 39 is pulled out or inserted into the main body frame 2, the elastic member 39 retreats to the registration front guide 37 and the bottom surface side of the main body frame 2 due to the elasticity of the elastic member 39, so that interference with these members is avoided. Paper cassette
26 can be smoothly attached and detached.

Further, in each of the above-described embodiments, the case where the main body frame 2 is located above the paper feed cassette 26 has been described.
Even in the case of a two-stage paper feed cassette provided with, the cassette guide 35 operates similarly.

(G) Effects of the Invention As described above, according to the present invention, when the cassette is mounted on the main device, the cassette guide is elastically maintained in a state of protruding into the sheet conveying path of the main device. The feeding path between the main unit and the cassette overlaps, and the transfer of the sheet material from the cassette to the main unit is ensured.
Since the cassette guide comes into contact with the member on the main unit side and retreats to the cassette side against the elastic force, the cassette can be easily attached to and detached from the apparatus main body without requiring a complicated retreating mechanism.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a laser beam printer as an image forming apparatus to which the present invention is applied, FIG. 2 is an operation diagram showing a sheet feeding state, and FIG. 3 is an operation diagram showing a detached state of a sheet cassette. FIG. 4 is a vertical sectional side view of an image forming apparatus to which the second embodiment of the present invention is applied. P 2 ... sheet material, 1 ... laser beam printer (main unit), 2 ... main body frame, 4 ... feeding path, 26 ...
Paper feed cassette, 33: sheet transport path, 35: cassette guide, 35a: upper part of cassette guide, 37: guide before registration, 39: elastic member.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Kazuo Takeuchi Inventor Kazuo Takeuchi 1-11-2 Kyobashi, Chuo-ku, Tokyo Inside Japan Thai Painter Co., Ltd. (56) References JP-A-3-138230 (JP, A) -124941 (JP, U) Actually open 1987-6-11647 (JP, U)

Claims (3)

(57) [Claims]
1. A sheet material feeding device having a cassette provided in a lower part of a main body device having a sheet conveying path at a lower portion and detachably provided for storing a sheet material fed by a sheet feeding means. When the cassette is mounted on the main body device, the cassette is protruded and maintained in the sheet conveyance path by elastic force in a direction protruding toward the main body device to form a feeding path, and when the cassette is attached to or detached from the main body device. And a cassette guide provided on the cassette, the cassette guide being pushed down by a member on the apparatus main body side and retracting to a position where the cassette can be attached and detached against an elastic force.
2. A cassette guide having a front end protruding into a sheet conveying path of a main body device by an elastic force of a spring, the protruding front end portion having a slope, and the cassette guide being attached to and detached from the main body device. The sheet feeding device according to claim 1, wherein the slope is pressed by a member on the main body device side and retracts to a position where the cassette can be attached and detached against the elastic force of the spring.
3. The cassette guide itself is an elastic member. When the cassette is attached to and detached from the main unit, the cassette guide is pressed by a member on the main unit side so that the cassette can be attached and detached against the elastic force of the cassette guide itself. The sheet feeding device according to claim 1, wherein the sheet feeding device is retracted to a position.
JP2176747A 1990-07-04 1990-07-04 Sheet material feeding device Expired - Fee Related JP2710168B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2176747A JP2710168B2 (en) 1990-07-04 1990-07-04 Sheet material feeding device

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2176747A JP2710168B2 (en) 1990-07-04 1990-07-04 Sheet material feeding device
US07/724,882 US5201873A (en) 1990-07-04 1991-07-02 Sheet feeding apparatus having the ability to retract the sheet supply
EP19910111008 EP0464785B1 (en) 1990-07-04 1991-07-03 Sheet feeding apparatus
DE1991619303 DE69119303D1 (en) 1990-07-04 1991-07-03 Sheet feeder
DE1991619303 DE69119303T2 (en) 1990-07-04 1991-07-03 Sheet feeder

Publications (2)

Publication Number Publication Date
JPH0464533A JPH0464533A (en) 1992-02-28
JP2710168B2 true JP2710168B2 (en) 1998-02-10

Family

ID=16019104

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2176747A Expired - Fee Related JP2710168B2 (en) 1990-07-04 1990-07-04 Sheet material feeding device

Country Status (1)

Country Link
JP (1) JP2710168B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0933397B1 (en) * 1996-10-16 2002-12-18 Kureha Kagaku Kogyo Kabushiki Kaisha Poly(phenylene sulfide) resin composition
JP4784204B2 (en) * 2005-08-24 2011-10-05 富士ゼロックス株式会社 Paper feeding cassette and image forming apparatus
JP5044792B2 (en) 2007-09-14 2012-10-10 株式会社リコー Image forming apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02276733A (en) * 1989-04-18 1990-11-13 Ricoh Co Ltd Paper guiding device

Also Published As

Publication number Publication date
JPH0464533A (en) 1992-02-28

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