KR19980079900A - Feeder - Google Patents

Abstract

The paper tray is provided with a paper feeder which does not fall down at the time of withdrawing the paper tray but has a reduced price.

The paper 9 loaded on the paper tray 8 is taken out one by one using a tilting pickup roller.

The paper thus pulled out is separated one by one by the separating section composed of the paper feeding roller 3 and the separating roller 4, and the separated paper is conveyed to the apparatus body (image forming section).

The release lever 12 acts on the pick-up roller 2, and the pressure lever 15 acts on the separation roller 4.

The release lever 12 and the pressure lever 15 are connected to each other by a link 14. Both the pickup pressurization and the separation pressurization are released by the interlocking action of the release lever 12 and the pressure lever 15 when the paper tray 8 is pulled out from the apparatus main body.

Description

Feeder

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a sheet feeding apparatus that is applied to a copying machine, a facsimile machine, a printer, a printing machine, etc., The paper feed roller and the separation roller are separately fed one by one by a separating means which is a folding member.

In the paper feeding device in which the recording sheets stacked on the paper trays are picked up by the pickup roller and the recording sheets picked up by the pickup rollers are separated one by one by using a separating means composed of a feeding roller and a separating roller, It is necessary to separate the pickup roller from the paper and also to separate the separation roller from the paper feed roller in order to prevent the paper from falling off (slip) from the paper tray when it is withdrawn from the paper tray.

In the conventional paper feeding apparatus, the release of the pressure of the pickup roller is proposed by ON / OFF of the solenoid as disclosed in Japanese Unexamined Patent Application Publication No. 59-57841 and Japanese Unexamined Patent Publication No. 59-69328, When the tray is detached, the pickup roller is configured to be separated from the paper.

In addition, the release of the separation pressure is controlled by ON / OFF of the solenoid, so that the roller of the separation portion is separated during non-operation and detachment of the paper tray.

Thus, in the conventional paper feeding apparatus, pressing down of the pick-up roller and disengagement of the separating roller against pressure are performed in accordance with ON / OFF of the solenoid, resulting in a problem of downsizing and downsizing of the apparatus. Further, as disclosed in Japanese Utility Model Publication No. 60-122732, although the separation pressure is released by the attachment / detachment of the paper tray, it is insufficient to solve the above problem merely by releasing the separation pressure.

SUMMARY OF THE INVENTION A first object of the present invention is to provide an image forming apparatus in which a paper tray is detached from a main body of an image forming apparatus while realizing reduction in the size of the apparatus and reduction in cost, A paper feeding apparatus capable of preventing the paper from dropping out from a paper tray when the paper is taken out.

A second object of the present invention is to provide a paper feeding apparatus capable of realizing an inexpensive apparatus with a simpler constitution by integrally forming at least one rotary member and at least one of two low-

A third object of the present invention is to provide a paper feeding apparatus which can integrate a rotating member and a pick-up pressure blocking means together and realize a cheap apparatus with a simple structure by interlocking the rotating member and the separation pressure blocking means.

A fourth object of the present invention is to provide a paper feeding device capable of achieving lower cost with a simple configuration and improving reliability.

A fifth object of the present invention is to provide a paper feeding device capable of easily carrying out pick-up pressure release at a position other than the paper conveying position, and capable of further improving the reliability of the apparatus by preventing the paper from being jammed at some portions at the time of withdrawing the tray .

1 is a perspective view showing a paper feeding unit which is a main part of a paper feeding apparatus according to a first embodiment of the present invention.

2 is a sectional view taken along the line B-B in Fig.

Fig. 3 is a perspective view showing a gear engagement mechanism and a pressure release mechanism of a pick-up roller, a pit roller, and a separation roller of the paper feed unit of Fig. 1;

Fig. 4 is a perspective view of a separation roller portion in the paper feed unit shown in Fig. 1 (a perspective view of a separation and pressing mechanism). Fig.

5 is an overall perspective view of the partial pressure and pick-up pressure release mechanism in the paper feed unit of FIG.

6 is a plan view of the partial pressure release mechanism in the paper feed unit of FIG.

7 is a side view of the partial pressure release mechanism of Fig.

Fig. 8 is a side view of the pick-up and press-fitting mechanism in the paper feed unit of Fig. 1, in which 8a and 8b show the state of the pick-up and drop presentation and 8b and Fig.

Fig. 9 is a perspective view (a perspective view of the separation pressure release mechanism) of the separation roller portion of the paper feeder according to the second embodiment of the present invention. Fig.

10 is a partial plan view of the separating and pressing mechanism in Fig.

11 is a sectional view taken along the line C-C in Fig.

DESCRIPTION OF THE REFERENCE SYMBOLS

2: pick up roller

3: Feed roller

4: separation roller

5b: Pickup pressure spring

6: guide plate

8: Paper tray (recording paper tray)

12, 112: release levers

12e, 112e: a tapering surface,

112g: cam surface

13, 113: Release spring

14: link

14d: key portion

15, 115: Pressurization levers

16: Pressurization spring

According to a first aspect of the present invention,

A paper tray detachably attached to the image forming apparatus main body,

A pick-up roller for picking up the recording paper stacked on the paper tray,

Up pressing means for pressing the pick-up roller against the paper,

Up pick-up preventing means for preventing the pick-up from being pressed,

Separating means consisting of a paper feed roller and a separating roller for separating paper taken out one by one,

Separating and pressing means for pressing the separating roller against the feeding roller,

Separation pressure suppressing means for preventing separation pressure,

A rotating member that rotates in accordance with the attaching / detaching operation of the paper tray,

Movable means for moving the rotary member when the paper tray is drawn out,

Interlocking means for causing the rotating member to cooperate with at least one of the pick-up-pressure blocking means and the separation-

Lt; / RTI >

According to a second aspect of the present invention,

A paper tray detachably attached to the image forming apparatus main body,

A pickup roller for picking up the paper stacked on the paper tray,

Up pressing means for pressing the pick-up roller against the paper,

Up pick-up preventing means for preventing the pick-up from being pressed,

Separating means consisting of a paper feed roller and a separating roller for separating paper taken out one by one,

Separating and pressing means for pressing the separating roller against the feeding roller,

Separation pressure blocking means for blocking separation pressure,

A rotatable member that rotates in accordance with a detachment operation of the paper tray,

Wherein when the recording paper tray is drawn out, the rotating member is operated and has the moving means,

Wherein the rotary member is integral with at least one of the pickup-pressure blocking means and the separation-pressure blocking means,

Is solved by a second means.

According to a third aspect of the present invention,

A paper tray detachably attached to the image forming apparatus main body,

A pickup roller for picking up the paper stacked on the paper tray,

Up pressing means for pressing the pick-up roller against the paper,

Up pick-up preventing means for preventing the pick-up from being pressed,

Separating means consisting of a feeding roller and separating roller for separating the paper taken out from the paper tray one by one,

Separating and pressing means for pressing the separating roller against the feeding roller,

Separation pressure blocking means for blocking separation pressure,

A rotary member which rotates by the attachment / detachment operation of the paper tray;

And movable means for moving the rotary member when the paper tray is pulled out,

The rotation means and the pickup pressure blocking means are combined to constitute one unit and the third means provided in the paper feeding apparatus including the rotation means and the interlocking means for interlocking the rotation pressure member and the separation pressure blocking means.

According to a fourth aspect of the present invention,

A paper tray detachably attached to the main body of the image forming apparatus,

A pick-up roller for picking up the paper stacked on the paper tray,

Up pressing means for pressing the pick-up roller against the recording sheet,

Up pick-up preventing means for preventing the pick-up from being pressed,

Separating means consisting of a feeding roller and a separating roller for separating the paper sheets from the paper tray one by one,

Separating and pressing means for pressing the separating roller against the feeding roller,

Separation pressure blocking means for blocking separation pressure,

A rotating member that rotates by a detachment operation of the paper tray,

And moving means for moving the rotating member when the recording tray is taken out,

The rotary member and the separation pressure blocking means are integrally formed,

Wherein the separation pressure blocking means is in contact with a shaft for driving the separation roller, and the material is oil-including polyacetal,

Can be solved by a fourth means provided in the paper feeder.

The fifth object of the present invention resides in that in any one of the first to fourth means, a support member for supporting the pick-up roller and a paper guide member for guiding the paper are integrally formed, and the pick- And a fifth means for contacting the paper guide member and moving the paper guide member up and down.

BRIEF DESCRIPTION OF THE DRAWINGS Fig.

FIG. 1 is a perspective view showing a feeding unit which is a main part of a sheet feeding apparatus according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line BB of FIG. 1, Fig. 4 is a perspective view of the separation roller portion of the paper feed unit (a perspective view of the separation pressure release mechanism), Fig. 5 is a perspective view showing the separation pressure of the paper feed unit and the pressure release mechanism Fig. 7 is a side view of the separating-pressure release mechanism shown in Fig. 6, and Fig. 8 is a side view of a pickup-uncompressing mechanism of the sheet feeding unit of Fig. 1. Fig. (a) shows a pickup-pressing presentation (b) shows a state at the time of pick-up pressurization.

The paper feed unit A of FIG. 1 is a main part of the entire paper feed unit including the paper tray 8 shown in FIG. The box-shaped housing 1 is provided with a pickup roller 2, a feeding roller 3, and a separating roller 4.

The pick-up arm 5 is supported on a shaft 3a of a feed roller (feed roller) 3 (see Figs. 2 and 3) and rotates around the shaft 3a as a turning material, Position.

3), and the pick-up arm 5 is urged to the virtual line position shown in Fig. 1 by the pick-up pressing spring 5b (see Fig. 3) . The pickup roller 2 is driven from the feeding roller 3 through a gear 7 (see Figs. 2 and 3).

On the other hand, the separating roller 4 stands at one end of the shaft 4a (see Fig. 4) and is supported so as to be swingable in the vertical direction about the other end of the shaft 4a (the bearing 4d in Fig. 4). The shaft 4a is connected to a shaft 4b which is parallel to the shaft 4a by mutual gears. The shaft 4a transfers the driving force inputted from the gear protruding to the outside of the sheet feeding unit A to the separating roller 4.

The pick-up arm 5 is integrally formed with a guide plate 6 for guiding the sheet from the pick-up roller 2 to the sheet feeding roller 3, and an inclined surface 6a (see FIG.

The release lever 12, which is a rotating member, is described below the inclined surface 6a. As shown in Fig. 5, the release lever 12 is of the 형 type, and has a pivot shaft 12a at its center and is supported by a pivotal member. On the end of the release lever 12, a pin 12b is directed downward, a projection 12d and a projection 12f are provided on the other end, and the projection 12d has an inclined surface 12e opposed to the inclined surface 6a of the guide plate 6.

A link 14 is shown at the lower end side of the release lever 12, and the link 14 has a slot 14a for fitting with the pin 12b at one end, as shown in Figs. A guide groove 14b for fitting with a guide pin 17 (see Figs. 5 and 6) fixed to the housing 1 is described. The guide groove 14b is formed as a movable member in the left and right directions in Figs. 6 and 7 along the groove 14b.

6 and 7) by means of the release spring 13, whereby the release lever 12 is also turned counterclockwise (see FIG. 6 As shown in FIG. A key portion 14d (refer to FIG. 5-7) is pointed downward at an end opposite to the long hole 14a, and is opposed to the arm portion 15c of the press lever 15 described later.

As shown in Figs. 4-7, a pressing lever 15 having a " " -shaped shape is pivotally mounted on the rotation shaft 15a below the shaft 4a of the separating roller 4, and the bearing 4c on the shaft 4a is supported on the end supporting portion 15b . And an arm portion 15c horizontally formed at the other end, and is opposed to the key portion 14d of the link 14 described above. And is further urged to push the bearing 4c upward by the tension exerted by the pressing spring 16 with the hook portion 15d.

Hereinafter, the paper feeding operation in the paper feeding apparatus of the first embodiment of the present invention will be described.

The pickup roller 2 is in contact with the topmost sheet of the sheet 9 loaded in the sheet tray 8 by the biasing force of the spring 5b at the position (the imaginary line in FIG. When the shaft 3a of the feeding roller is rotated in the counterclockwise direction by a driving source (not shown), the pickup roller 2 is rotated counterclockwise through the gear 7 in the same manner as the feeding roller 3 and feeds the sheet toward the feeding roller 3.

The paper that has reached the paper feeding roller 3 advances in the right direction of Fig. 2 by the paper feeding roller 3 which is gripped between the paper feeding roller 3 and the separation roller 4 and rotates counterclockwise. At this time, the separation roller 4 is driven by the shafts 4a and 4b (see FIG. 4) and the gears described thereon from a driving source (not shown), and is rotated counterclockwise.

The separation roller 4 incorporates a torque limiter, and when the paper is overlapped by two or more sheets, the lower side paper is pushed in the left direction of FIG. 2 so that only the uppermost paper is fed back.

Hereinafter, the pressing and releasing operations of the pick-up pressurizing and separating pressing in this embodiment will be described.

3 to 7 and 8B show a state in which the paper tray 8 is set in the apparatus main body and the release lever 12 presses the convex portion 12f against the paper tray 8 against the urging force received by the release spring 13.

At this time, as shown in FIG. 8B, the inclined surface 12e of the release lever 12 is separated from the inclined surface 6a of the guide plate 6, and the pickup arm 5 is biased by the pickup pressing spring 5b to press the pickup roller 2 against the paper.

Also, the link 14 is moved in the leftward direction of Figs. 6 and 7 by the pin 12b straddling the end of the release lever 12. [ Thus, the key portion 14d is separated from the arm portion 15c of the pressure lever 15, and the pressing lever 15 urged in the clockwise direction in FIG. 7 by the pressing spring 16 pushes the bearing 4c upward, and brings the separation roller 4 into contact with the feeding roller 3. Both the pickup pressure and the separation pressure are applied, and the paper can be fed.

When the paper tray 8 is pulled out at the time of paper replenishment or the like, the paper tray 8 is detached from the convex portion 12f of the release lever 12, and the release lever 12 is moved to the position of the virtual line in FIG. 6 by the urging force of the release spring 13.

At this time, as shown in Fig. 8 (a), the inclined surface 12e of the release lever 12 comes into contact with the inclined surface 6a of the guide plate 6, and the guide plate 6 is pressed upward. The pick-up arm 5 integrated with the guide plate 6 is pressed upside down by the biasing force of the pick-up pressing spring 5b, so that the pickup roller 2 is separated from the paper. The link 14 is moved in the rightward direction of Figs. 6 and 7 by the pin 12b straddling the end of the release lever 12. Fig.

Thus, the key portion 14d comes into contact with the arm portion 15c of the pressure lever 15, and rotates the pressure lever 15 in the counterclockwise direction in Fig. 7 in the direction opposite to the biasing force of the separation pressure spring 16.

The bearing 4c is also lowered by the lowering of the support portion 15b, and the separation roller 4 falls off the feeding roller 3. [ As a result, both the pickup pressure and the separation pressure are released, and the paper 9 of the paper tray 8 is pulled out of the apparatus together with the tray.

Needless to say, the biasing force of the release spring 13 surpasses the biasing force exerted by the pickup pressing spring 5b and the separation pressing spring 16. It is also needless to say that the clamping force when the paper tray 8 is set by the fixing means (not shown) surpasses the urging force to move the lever 12 in the virtual line direction of Fig. 6 by the release spring 13.

In the above embodiment, the rotary member (release lever 12) functions in cooperation with the separation pressure blocking means (the key portion 14d of the link 14), but the present invention is not limited to this, And may be interlocked with at least one of the pressure blocking means and the separation pressure blocking means.

In the above-described embodiment,

A paper tray 8 detachably attached to the main body of the image forming apparatus,

A pickup roller 2 for picking up the paper stacked on the paper tray 8,

Up pick-up means (pickup pick-up spring 5b) for pressing the pick-up roller 2 against the paper,

Up-pressure preventing means (inclined surface 12e) for preventing pick-up pressurization,

A separating means consisting of a feeding roller 3 and a separating roller 4 for separating the picked-up sheets one by one,

Separation pressure means (pressure lever 15, pressure spring 16) for pressing the separation roller 4 against the paper feed roller 3,

Separation pressure blocking means (key portion 14d of the link 14) for preventing separation pressure,

A release lever 12 that rotates by the attachment / detachment operation of the paper tray 8,

A release spring 13 for urging the release lever 12 when the paper tray 8 is pulled out, and

Interlocking means (pin 12b, elongated hole 14a) for interlocking at least one of the pick-up pressure blocking means and the separation pressure blocking means (the key portion 14d of the link 14)

.

The pick-up pressure release and the separation pressure release operation are performed in conjunction with the detachment operation of the paper tray 8, and a simple structure can realize a small apparatus and a low manufacturing cost.

Moreover, it is possible to prevent the paper from falling (slipping) from the paper tray 8 when the paper tray 8 is drawn out from the apparatus main body.

Further, in the above embodiment,

A paper tray 8 detachably attached to the main body of the image forming apparatus,

A pick-up roller 2 for picking up the paper stacked on the paper tray 8,

Up pick-up means (pickup pick-up spring 5b) for pressing the pick-up roller 2 against the paper,

Up-pressure preventing means (inclined surface 12e) for preventing the pressurization of the pickup,

A separating means consisting of a feeding roller 3 and a separating roller 4 for separating the picked-up sheets one by one,

Separation pressure means (pressure lever 15, pressure spring 16) for pressing the separation roller 4 against the paper feed roller 3,

Separation pressure blocking means (key portion 14d of the link 14) for preventing separation pressure,

A release lever 12 that rotates by the attachment / detachment operation of the paper tray 8, and

A release spring 13 for urging the release lever 12 when the paper tray 8 is pulled out,

.

In the above structure, the release lever 12 and the pickup pressurizing / blocking means (inclined plane 12e) are integrally formed. Further, the apparatus is provided with interlocking means (pin 12b, slot 14a) for interlocking the release lever 12 with the separation-pressure blocking means (the key portion 14d of the link 14).

Further, the release lever 12 and the pickup-pressurizing / stopping means (the slope face 12e) are integrally formed, and furthermore, the release lever 12 and the separation-pressurizing prevention means (the key portion 14d of the link 14) interlock with each other. As a result, a low-cost apparatus having a simple structure can be realized.

Hereinafter, a second embodiment of the present invention will be described.

Fig. 9 is a perspective view of a separation roller portion (a perspective view of a separation pressure release mechanism) of a paper feeding apparatus according to a second embodiment of the present invention, Fig. 10 is a partial plan view of the separation / .

Only the portions different from the first embodiment will be described.

As shown in Fig. 9, the release lever 112 is substantially b-shaped, and is pivotable about a rotation axis 112a located in the projection. Each of the ends 112e and 112f of the arm portion of the release lever 112 of the "? &Quot; corresponds to the end portions 12e and 12f of the arm portion of the embodiment, and has a cam surface 112g that extends perpendicularly to the other end and is bent in a key shape.

Further, a hook portion 112h is provided at the lower portion thereof, and the release lever 112 is biased counterclockwise by the tension spring 113 which is tensioned thereon.

The press lever 115 differs from the first embodiment in that it does not have an arm portion.

As a method of operation, the method of lowering the shaft 4a of the separation roller 4 is different from that of the first embodiment. 11 (a) when the paper tray 8 is set and the cam surface 112g is separated from the shaft 4a, but when the tray 8 is pulled out, the release lever 112 comes into contact with the shaft 4a as shown in Fig. 11 (b) The shaft 4a is pressed down according to the shape of the cam surface 112g. The separating roller 4 is separated from the sheet feeding roller 3 and the separating pressure is released.

Further, in the configuration in which the drive is transmitted to the shaft 4a even when the tray 8 is drawn out, since the cam surface 112g of the release lever 112 moves so as to descend on the rotating shaft, it is formed of a material having excellent rigidity .

In the above-described second embodiment,

A paper tray 8 detachably attached to the image forming apparatus main body,

A pick-up roller 2 for picking up the paper stacked on the paper tray 8,

Up pick-up means (pickup pick-up spring 5b) for pressing the pick-up roller 2 against the paper,

Up-pressure preventing means (inclined surface 112e) for preventing the pressurization of the pickup,

A separating means consisting of a sheet feeding roller 3 and a separating roller 4 for separating sheets taken out one by one,

Separation pressure means (pressure lever 115, pressure spring 16) for pressing the separation roller 4 against the paper feed roller 3,

A separation pressure blocking means (cam surface 112g) for blocking separation pressure,

A release lever 112 that rotates by the attachment / detachment operation of the paper tray 8, a release spring 113 that urges the release lever 112 when the paper tray 8 is pulled out,

.

In this configuration, the release lever 112 and the separation pressure blocking means (the cam surface 112g) are integrally formed, and the separation pressure blocking means (the cam surface 112g) is in direct contact with the shaft 4a for driving the separation roller 4, Since it is an acetal, it is possible to attain a lower cost with a constitution of an absolute value and at the same time to improve the reliability.

Further, in each of the above embodiments,

A paper tray 8 detachably attached to the image forming apparatus main body,

A pick-up roller 2 for picking up the paper stacked on the paper tray 8,

Up pick-up means (pickup pick-up spring 5b) for pressing the pick-up roller 2 against the paper,

Up-pressure preventing means (inclined surfaces 12e and 112e) for preventing pickup pressurization,

A separating means consisting of a sheet feeding roller 3 and a separating roller 4 for separating sheets taken out one by one,

Separation pressure means (pressure levers 15 and 115, pressure spring 16) for pressing the separation roller 4 against the paper feed roller 3,

(The key portion 14d of the link 14, the cam surface 112g) for blocking separation pressure,

Release loops 12 and 112 that rotate by the attachment / detachment operation of the paper tray 8, and release springs 13 and 113 that bias the release levers 12 and 112 when the paper tray 8 is pulled out.

In this structure, since the release levers 12 and 112 are integrated with at least one of the pick-up pressure blocking means (the slope face 12e and the slope face 112e) and the separation pressure blocking means (the cam face 112g), it is possible to realize an inexpensive apparatus with a simpler structure.

In this embodiment, the support member (pick-up arm 5) for supporting the pickup roller 2 and the paper guide member (guide plate 6) for guiding the paper are integrally formed and the pick-up pressure blocking means (inclined surfaces 12e and 112e (Pick-up arm 5) and the paper guide member (guide plate 6) are integrally formed as the paper guide member (guide plate 6) is brought into contact with the paper guide member And the pickup pressure blocking means (inclined surface 112e) is in contact with the paper guide member (guide plate 6), and the paper guide member (guide plate 6) is raised and lowered, so that the pickup pressure release can be easily performed at a position outside the paper conveyance range And the paper guide member (guide plate 6) is also dropped at the time of pulling out the guide, so that there is no fear that the paper is caught anywhere, and the reliability of the apparatus is further improved.

According to the invention of claim 1,

The pickup pressure is released and the separation pressure is released in conjunction with the attachment / detachment operation of the paper tray. Further, since the apparatus can be downsized and reduced in size with a simple structure, it is possible to prevent the paper from dropping out of the paper tray I can do it.

According to the invention of claim 2,

By constructing at least one of the rotary member and the blocking means integrally, it is possible to manufacture an inexpensive device having a simpler configuration.

According to the invention of claim 3,

It is possible to manufacture an inexpensive apparatus having a simple constitution similar to that of the invention of claim 2 by integrating the rotary member and the pickup pressure blocking means together and by interlocking the rotary member and the separation pressure blocking means.

According to the invention of claim 4,

The rotary member and the separation pressure blocking means are integrally formed and the separation pressure blocking means is brought into contact with the shaft for driving the separation roller and the material is made of oil containing polyacetal so that a simple structure is achieved and a low cost And the reliability can be improved.

According to the invention of claim 5,

The pickup roller support member and the paper guide member are integrally formed and the pickup pressure blocking means is in contact with the paper guide member and the paper guide member is raised and lowered so that the pickup pressure release can be easily performed at a position outside the paper conveyance range And the paper guide is also dropped at the time of withdrawing the tray, whereby the paper is not caught anywhere, and the reliability of the apparatus can be further improved.

Claims (10)

A paper tray detachably attached to the image forming apparatus main body; A pick-up roller for picking up the recording paper loaded on the paper tray; Up pressing means for pressing the pick-up roller against the paper; Up pick-up preventing means for stopping the pressing of the pick-up; Separating means consisting of a feeding roller and a separating roller for separating the paper taken out from the paper tray one by one; Separation pressure means for pressing the separation roller against the paper feed roller; Separating and pressurizing blocking means for blocking the separating and pressing which presses the separating roller against the feeding roller; A rotating member which rotates in accordance with the attaching / detaching operation of the paper tray; Energizing means for moving the rotating member when the paper tray is drawn out; And interlocking means for causing the rotating member to interlock with at least one of the pick-up pressure blocking means and the separation pressure blocking means; . A paper tray detachably attached to the image forming apparatus main body; A pickup roller for picking up the paper stacked on the paper tray; Up pressing means for pressing the pick-up roller against the paper; Up pick-up preventing means for stopping the pressing of the pick-up; Separating means consisting of a feeding roller and a separating roller for separating the paper taken out from the paper tray one by one; Separation pressure means for pressing the separation roller against the paper feed roller; Separating pressure blocking means for blocking the separating pressure for pressing the separating roller against the feeding roller; A rotating member that rotates in accordance with a detachment operation of the paper tray; And at least one of the pickup pressure blocking means and the separation pressure blocking means is integrated with at least one of the pickup pressure blocking means and the separation pressure blocking means. A paper tray detachably attached to the image forming apparatus main body; A pickup roller for picking up the paper stacked on the paper tray; Up pressing means for pressing the pick-up roller against the paper; Up pick-up preventing means for stopping the pressing of the pick-up; Separating means consisting of a feeding roller and separating roller for separating the sheets taken out from the paper tray one by one; Separation pressure means for pressing the separation roller against the paper feed roller; A separation pressure blocking means for blocking the separation pressure; A rotating member which rotates in accordance with the attaching / detaching operation of the paper tray; And a movable unit for moving the rotary member when the paper tray is pulled out. The rotary member and the pickup pressure blocking unit are integrally combined to constitute a unit. Further, the rotary member and the separation- And interlocking means for interlocking the means. A paper tray detachably attached to a main body of the image forming apparatus; A pick-up roller for picking up the paper stacked on the paper tray; Up pressing means for pressing the pick-up roller against the recording sheet; Up pick-up preventing means for stopping the pressing of the pick-up; A separating means consisting of a feeding roller and a separating roller for separating the sheets from the paper tray one by one; Separation pressure means for pressing the separation roller against the paper feed roller; A separation pressure blocking means for blocking the separation pressure; A rotating member that rotates in accordance with a detachment operation of the paper tray; And movable means for moving the rotating member when the paper tray is drawn out; Wherein the rotary member and the separation pressure blocking means are integrally formed, and the separation pressure blocking means is in contact with a shaft for driving the separation roller, and the material is oil-including polyacetal Feeding device. The recording apparatus according to any one of claims 1 to 4, wherein the support member for supporting the pickup roller and the paper guide member for guiding the paper are integrally formed, and the pick-up pressure blocking means is in contact with the paper guide member, And the member is movable up and down. Detachably attaching a paper tray to the main body of the image forming apparatus; Picking up a paper stacked on the paper tray by a pickup roller; Pressurizing the pick-up roller so that the pick-up pressing means is in contact with the paper; Blocking the pick-up pressurization using a pick-up pressurizing stop means; Separating sheets taken out from the paper tray one by one using a separating means comprising a paper feed roller and a separating roller; Pressing the separating means so that the separating roller is in contact with the feeding roller by using a separating-pressing means; Blocking the separation pressure to press the separation roller so that the separation roller comes into contact with the sheet feeding roller by using the separation-pressure blocking means; Preparing a rotatable member that rotates in accordance with a detachment operation of the paper tray; Activating the rotating member when the paper tray is pulled out using energizing means; And further comprising interlocking means for causing the rotating member to interlock with at least one of the pick-up pressure blocking means and the separation-pressure blocking means; . Detachably attaching a paper tray to the main body of the image forming apparatus; Picking up a paper stacked on the paper tray by a pickup roller; Pressurizing the pick-up roller so that the sheet is in contact with the pick-up roller; Blocking the pick-up pressurization using a pick-up pressurizing stop means; Separating sheets taken out from the paper tray one by one using a separating means comprising a paper feed roller and a separating roller; Pressing the separating means so that the separating roller is in contact with the feeding roller by using a separating-pressing means; Blocking the separation pressure to press the separation roller so that the separation roller comes into contact with the sheet feeding roller by using the separation-pressure blocking means; Preparing a rotatable member that rotates in accordance with a detachment operation of the paper tray; Activating the rotating member when the paper tray is pulled out using energizing means; And further integrally coupling the rotating member with at least one of the pick-up pressure blocking means and the separation-pressure blocking means; . Detachably attaching a paper tray to the main body of the image forming apparatus; Picking up a paper stacked on the paper tray by a pickup roller; Pressurizing the pick-up roller so that the sheet is in contact with the pick-up roller; Blocking the pick-up pressurization using a pick-up pressurizing stop means; Separating sheets taken out from the paper tray one by one using a separating means comprising a paper feed roller and a separating roller; Pressing the separating means so that the separating roller is in contact with the feeding roller by using a separating-pressing means; Blocking the separation pressure to press the separation roller so that the separation roller comes into contact with the sheet feeding roller by using the separation-pressure blocking means; Preparing a rotatable member that rotates in accordance with a detachment operation of the paper tray; Activating the rotating member when the paper tray is pulled out using energizing means; And integrally coupling the rotating member and the pickup pressure blocking means; Wherein the paper feeding device includes interlocking means for causing the rotating member to interlock with at least one of the pick-up pressure blocking means and the separation-pressure blocking means. Detachably attaching a paper tray to the main body of the image forming apparatus; Picking up a paper stacked on the paper tray by a pickup roller; Pressurizing the pick-up roller so that the sheet is in contact with the pick-up roller; Blocking the pick-up pressurization using a pick-up pressurizing stop means; Separating sheets taken out from the paper tray one by one using a separating means comprising a paper feed roller and a separating roller; Pressing the separating means so that the separating roller is in contact with the feeding roller by using a separating-pressing means; Blocking the separation pressure to press the separation roller so that the separation roller comes into contact with the sheet feeding roller by using the separation-pressure blocking means; Preparing a rotatable member that rotates in accordance with a detachment operation of the paper tray; Activating the rotating member when the paper tray is pulled out using energizing means; And engaging the rotatable member and the detachment-pressure blocking means integrally with each other; And the separation-pressure restricting means are in contact with the separation roller driving shaft; Wherein the separation-pressurization-blocking means is an oil-containing polyacetal. The method of any one of claims 6 to 9, further comprising: integrally combining a support member for supporting the pickup roller and a paper guide member for guiding the paper; Contacting the pick-up pressure blocking means with the paper guide member; And raising and lowering the paper guide member; And feeding the sheet.