JPH04191223A - Paper sheet feeder in image forming device - Google Patents

Abstract

PURPOSE:To reduce generation of paper clogging by providing a slave roller making contact with the circumferential surface on the downstream side in the rotational direction of a paper sheet feeding roller and delivering a sheet delivered by the paper sheet feeding roller roughly upward by way of sandwiching the sheet with the paper sheet feeding roller. CONSTITUTION:A sheet is fed from a sheet storage part in accordance with rotation of a paper sheet feeding roller 61, sandwiched by a slave roller 70 immediately when it is fed, guided by the paper sheet feeding roller 61 and the slave roller 70 and carried roughly upward. That is, the head end of the sheet rarely advances linearly but is delivered roughly upward at the time of feeding the sheet and shortening of a carrier passage is attempted. Consequently, the whole of an image forming device is miniaturized and possibility of generation of paper clogging is lessened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper feeding device, and more particularly to a paper feeding device incorporated in an image forming apparatus that forms a toner image on a sheet using an electrophotographic copying method.

Conventional technology Conventionally, in the fields of laser beam printers and electrophotographic copying machines, when stacked sheets are fed one by one to a transfer unit, the sheets are first fed in a direction parallel to the stacked surface, and then guided. It was guided upward by a plate (see Japanese Utility Model Publication No. 2-31465).

However, in this type of paper feeding device, the sheet is first fed forward in the paper feeding direction, so the conveyance path becomes longer, the image forming device itself becomes larger, and the possibility of paper jams increases. .

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a paper feeding device that makes the device easy to use and reduces the occurrence of paper jams by configuring a short conveyance path immediately after paper feeding. There is a particular thing.

In order to achieve the above object, the paper feeding device according to the present invention includes:
a sheet storage unit that stores a plurality of sheets in a stacked state;
a paper feed roller that is installed so as to come into contact with the top end of the sheets stacked in this sheet storage section and feeds out the top layer sheet based on rotation in the paper feed direction; downstream in the rotational direction of this paper feed roller; The roller includes a driven roller that comes into contact with the side circumferential surface and pinches the sheet sent out by the paper feed roller with the paper feed roller and sends the sheet upward.

In the above configuration, the sheet is fed from the sheet storage section based on the rotation of the paper feed roller, and as soon as the sheet is fed, it is grabbed by the driven roller, and is guided by the paper feed roller and the driven roller and transported approximately upward. be done. In other words, the leading edge of the sheet is sent out almost upward without moving straight during paper feeding.
The conveyance path is being shortened. Therefore, the entire image forming apparatus becomes smaller and the possibility of paper jams is reduced.

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings.

[Overall Configuration] This embodiment is incorporated in a small laser beam blinker that writes an image on a photoreceptor with a laser beam, converts the written latent image into a toner image, and then transfers it onto a sheet.

As shown in FIG. 1, this printer generally has a sheet accommodating section 50, a laser beam scanning optical system unit 100, and an image forming cartridge 150 housed within a printer body frame 1. The operation section for the operator is provided on the left surface in FIG. 1, and hereinafter the left side in FIG. 1 will be referred to as the front side and the right side as the back side.

Inside the image forming cartridge 150, a photosensitive drum 160, a charging brush 171, a developing device 172, a transfer roller 180,
A cleaning blade 185 is integrally housed. The photosensitive drum 160 is driven to rotate in the direction of arrow a, and its surface is first charged to a predetermined potential by a charging brush 171, and then electrostatically charged by a laser beam incident through a slit 152 formed in the housing 151. An image is formed. This electrostatic latent image is developed with toner by passing through a developing sleeve 173 of a developing device 172.

On the other hand, a maximum of about 50 sheets are stacked on the tray 55 of the sheet storage section 50, and are pinched by the pinch roller 70 based on the rotation of the paper feed roller 61 in the direction indicated by the arrow. The housing 1
51 sheet guide slit 153 to the photosensitive drum 1
60 and the transfer roller 180. Here, the toner image is transferred to the sheet, and the sheet is fed through the sheet guide slit 154 to the heat fixing device 200, and is then sent face down from the discharge roller 211 to the upper surface of the main body frame 1, or approximately as shown by the two-dot chain line in FIG. The paper is discharged face up to the front side of the upright tray 220.

After the transfer, the photosensitive drum 160 is rotated in the direction of arrow a tf, and the remaining toner is scraped off from the drum surface by a cleaning blade 185 and stored in a waste toner chamber 186 provided at the upper part of the housing 151.

[Sheet storage section] The sheet storage section 50 is configured as a sheet storage chamber 51 by a tray 55 that holds sheets in a stacked state and a bottom surface of a housing 101 of an optical system unit 100, which will be described in detail below.

The tray 55 can extend toward the front side (to the left in FIG. 1), and its length can be adjusted depending on the sheet size. The sheets of all sizes are placed vertically (the long side of the sheet is set parallel to the paper feeding direction) and cut, and the set state of the sheets of each size is as shown in FIG. Tray 55
The maximum extension length is for holding a legal size seat as shown in FIG. 4, and it protrudes outward from the main body frame 1 to hold the rear end of the seat. Further, a pair of width regulating plates 59 that are slidable in the width direction are installed on the tray 55, and can regulate sheets of various sizes in the width direction.

On the other hand, on the front side of the main body frame 1, the inclined portion in FIG. The cover 11 is rotatable in the vertical direction about the bin 12, and is lifted up to the angle (I) in FIG. 5 when replenishing sheets. Further, when printing a long size sheet (for example, A4 size, legal size), the cover 11 has a rear end located in the opening 10 or protrudes from the opening 10.
The centrifuge is placed with the opening 10 open at the angle (n) in FIG. 1 or FIG.

In order to hold the cover 11 at the angle (I) or (II), a leaf spring 13 is fixed to the main body frame 1, and projections 14a, 14b are provided at the base of the cover 11, as shown in FIG.
A cam 14 having a diameter is attached. The cover 11 is rotatable with the cam 14 in pressure contact with the leaf spring 13, and when it is rotated upward and the protrusion 14b passes over the leaf spring 13, it is held at an angle of (■). When the cover 11 is further rotated upward, the protrusion 14a is moved against the leaf spring 13.
When it crosses over, it is held at the angle (I).

Further, the cover 11 is made of a transparent material such as acrylic resin. This is so that even when the cover 11 covers the opening 10, the remaining amount of sheets in the storage chamber 51 can be immediately confirmed.

By the way, the sheet storage chamber 51 has a tray 55 on the lower surface and a 7S housing 10 of the optical system unit 100 on the upper surface.
1, and is inclined as a whole from the opening 10 toward the back side of the main body frame 1 (paper feed section side). Furthermore, the storage chamber 51 is tapered toward the back side. The sheet is inserted onto the tray 55 through the opening 10 opened by the cover 11. At this time,
The operator can set the sheet on the tray 55 by sliding the sheet downward along the inclination of the tray 55 while remaining positioned on the front side of the main body frame 1, and the tip of the sheet that can be fully inserted is tapered. Containment room 5
Since the sheet can be guided by the upper and lower surfaces of 1, replenishing sheets is easy.

Further, the bottom surface of the housing 101 of the optical system unit 100 has recesses 102°102 on both sides, as shown in FIG.
has. This depression 102 is for storing postcards, etc. in the containment room 51.
When ＼-sized sheets are stored, the storage chamber 51 becomes a space for inserting one's hand when taking out the sheets, making it easy to take out the sheets.

[Paper Feeding Mechanism] The sheet feeding mechanism 60 can be installed at the tip of the sheet storage chamber 51 in the sheet insertion direction, and as shown in section 6, the sheet feeding mechanism 60 includes a sheet feeding roller 61, a cam 65, a push-up rod 66, and a sheet handling pad. 67, and a pinch roller 70. Further, a sheet push-up plate 56 is connected to the tip of the tray 55, and this push-up plate 56 is rotatable in the vertical direction with respect to the tray 55 via a bin 57. It is constructed integrally with the rod 66. The cam 65 is fixed coaxially with the paper feed roller 61, and has an arcuate portion 65a and a curved portion 65.
It is composed of b. The push-up 1iI66 is always urged upward by a spring member (not shown), and its tip abuts against the outer circumferential surface (arc part 65a, curved part 65b) of the cam 65.

The cam 65 rotates once in the direction indicated by the arrow, together with the paper feed roller 61, for each sheet fed. At the start of paper feeding, the cam 65 is in the position shown in FIG. 6 (angular displacement 0'), and the tip of the push-up rod 66 faces the curved surface portion 65b, allowing upward movement. As a result, the push-up plate 5
6 is also lifted up to a substantially horizontal state, and the leading edge of the sheet stacked on the push-up plate 56 is in pressure contact with the paper feed roller 61. When the paper feed roller 61 and the cam 65 are rotationally driven in the direction of the arrow in this state, the uppermost sheet begins to be fed out in synchronization with the rotation of the paper feed roller 61, and the push-up rod 66
It descends along the shape of 5b. When the cam 65 is displaced 72 degrees, the push-up bar 66 descends to position A, as shown in FIG. Contact with paper roller 61 is released. At this time, the leading edge of the fed sheet is pinched between the paper feed roller 61 and the pinch roller 70, and the paper feed roller 61
1, the image forming cartridge 1 moves diagonally to the right in Fig. 1.
50 toward the sheet guide slit 153. The paper feed roller 61 rotates once during paper feeding, and after one rotation, the leading edge of the sheet is sandwiched between the photosensitive drum 160 and the transfer roller 180.

Therefore, after the paper feed roller 61 stops rotating, the sheet is conveyed based on the rotation of the photosensitive drum 160.

On the other hand, the sheet handling pad 67 is connected to the pinch roller 7 by a spring member (not shown) with respect to the paper feed roller 61.
It is installed so that it can be touched just before 0.

This pad 67 is provided when the push-up plate 56 is located above and the sheet is in contact with the paper feed roller 61 (angular displacement 0 to 9
0 degrees), it contacts the paper feed roller 61 and prevents the sheet from being fed twice. Further, when the push-up bar 66 is pushed down by the cam 65 and the push-up plate 56 moves downward (angular displacement of 90 to 351 degrees), the push-up plate 56 pushes down the receiving part 69 of the pad holding member 68, and the pad 67 is released from contact with the paper feed roller 61.

The receiving portion 69 also controls the position of the leading edge of the sheet completely inserted onto the tray 55.

In the paper feeding mechanism 60 having the above configuration, when a sheet is fed, it is immediately sent upward along the periphery of the paper feeding roller 61 without moving straight. Therefore, the sheet conveyance path becomes shorter, and the overall size of the printer is reduced.

[Image Forming Cartridge] As shown in FIG. 9, the image forming cartridge 150 includes a photosensitive drum 160 and a charging brush 17 in a housing 151.
1. The developing device 172, transfer roller 180, and cleaning blade 185 are fully housed. The developing device 172 has a developing sleeve 173, a toner tank 174 partitioned by a partition wall 155 is completely filled with toner, and a blade member 1
Based on the rotation of 75 in the direction of arrow C, the developing sleeve 173 is supplied through the window 155a.

The housing 151 has a slit 15 for laser beam incidence.
2. Sheet guide slits 153 and 154 are formed,
The upper part is a cleaning blade 185 that cleans the photosensitive drum 16.
The tank 186 of waste toner scraped from the surface of 0 is broken. As shown in FIG. 3, the image forming cartridge 150 is removably attached to a holding frame 21 which is installed in the main body frame 1 via a support shaft 20 so as to be rotatable in the vertical direction. As shown in FIGS. 11 and 12, a holder 25 is fixed to the holding frame 21, and the image forming cartridge 150 is held in the holder 25 while being inserted therein.

The image forming cartridge 150 is replaced with a new one when the photoreceptor reaches the end of its life or the toner runs out. The exchange is
This is done by lifting the holding frame 21 to the state shown in FIG. 3 and attaching and detaching the image forming cartridge 150 to the holder 25. The image forming cartridge 150 is inserted into the holding frame 21 by a protrusion 155 provided on the upper surface of the housing 151 coming into contact with the protrusion 26 of the holder 25 , and the image forming cartridge 150 is positioned at an insertion position with respect to the holding frame 21 . It is held in pressure contact with the holder 25 by a leaf spring 23 (see FIG. 3).

When the holding frame 21 is rotated downward from this attachment/detachment operation position, the image forming cartridge 150 is completely set in the main body frame 1. That is, in the image forming cartridge 150, the support shaft 161 of the photosensitive drum 160 protruding from both sides of the housing 151 comes into contact with the groove 31 of the frame 30 fixed to the main body frame 1, as shown in FIG. When the recess 155 formed on the lower surface of the housing 151 comes into contact with the protrusion 103 formed on the housing 101 of the optical system unit 100, the image forming operation position within the main body frame 1 can be determined.

When the image forming cartridge 150 is set at the image forming operation position, the most accurate positioning is as follows.
This is a photosensitive drum 160. In this embodiment, since the positioning at the image forming operation position is performed by the support shaft 161 of the photoreceptor drum 160, the positioning accuracy of the photoreceptor drum 160 is improved. Further, the housing 151 is also positioned near the laser beam exit window 105 of the optical system unit oo by the convex portion 103 of the housing 101 of the optical system unit 100. As a result, the laser beam incidence slit 152 is connected to the laser beam exit window 105.
is accurately positioned.

Next, the shape of the housing 151 will be explained.

As shown in FIGS. 10 and 11, the housing 151 has a gently curved shape such that the distal end 151a in the mounting direction is convex in the mounting direction X, and the rear end 151b also extends in the detachment direction (arrow It has a gently curved surface that is convex in the opposite direction to X. Further, a continuous portion 151c between the leading end portion 151a and the rear end portion 151b has a gentle planar shape. Specifically, the front end portion 151a and the rear end portion 151b have a substantially cylindrical shape centered on an axis perpendicular to the mounting direction X.

The reason why the outer shape of the housing 151 is made as described above is because
When an operator replaces the image forming cartridge 150, the outer shape of the housing 151 looks like an egg, so the idea is to create an image that is rounded, soft, and easy to handle, rather than an angular image that seems difficult to handle. . Furthermore, when replacing the image forming cartridge 150, the operator manually removes the rear end portion 151 of the housing 151.
b, but in this case as well, the rear end 151
If b has a curved shape, it will fit better in the palm of your hand. Furthermore, when packing the image forming cartridge 150,
Since the housing 151 has a curved shape, the packaging will not be torn.

In fact, it is preferable that the height of the rear end 151b of the housing 151 is about 2 to 8 cm, that is, the height is such that the operator can easily grasp the rear end 151b by hand. To prevent the housing 151 from slipping when gripped by hand, as shown in FIG.
What is necessary is just to provide many uneven|corrugated parts 151d extending in the width direction on the surface.

Furthermore, as shown in FIG. 9, the photoreceptor drum 160 is arranged approximately at the center of the tip 151a of the housing 151, and the developing device 172, transfer roller 180, and cleaning blade 185 are also arranged at the back side of the housing 151. There is. Toner powder smoke is likely to be generated in these parts, and the toner powder smoke may stain the optical system unit 100 or leak to the outside through the laser beam entrance slit 1452. If the photoreceptor drum 160 is placed at a position away from the optical system unit 100 in the /\Using 151, the slit 152
This increases the length of time, and it is possible to prevent the optical system unit 100 from becoming dirty due to toner powder smoke. Further, since a long optical path of the laser beam inside the image forming cartridge 150 can be ensured, there is no need to provide a shutter to protect the photosensitive drum 160 inside the image forming cartridge 150 from external light.

[Sheet Conveyance Path] In this embodiment, the sheet conveyance path includes the sheet storage section 50, the paper feed mechanism 60, and the vertical conveyance path 80, as shown in FIG.
and a paper discharge means 210.

The vertical conveyance path 80 is located on the back side of the main body frame 1, and includes a paper feed roller 61, a pinch roller 70, sheet guide slits 153, 154, a photoreceptor drum 160, and a transfer roller 1.
80 and a fixing device 200.

The paper ejection means 210 includes an ejection roller 211 and a delivery roller 21.
2. The main component is the tray 220.

As shown in FIG. 13 and FIG.
It is rotatably attached to the support shaft 221 as a fulcrum. A switching claw 30 is installed in the block 25 to switch the paper discharge mode between face-down paper discharge and face-up paper discharge. The switching claw 30 is rotatable and detachable about the pin 31, and the cover 32 provided on the surface of the block 25
is connected to one end of the lever 34 via a lever 34. cover 3
2 is rotatable around the bin 33 and can be opened and closed by the operator. When the cover 32 closes the opening 26 of the block 25, the switching claw 30 is located on the same plane as the sheet guide surface 27, and the sheet conveyed from the discharge roller 211 is guided by the surface 30a (
(See Figure 14). At this time, the sheet is discharged onto the upper surface of the main body frame 1 from the discharge 1:I24 of the holding frame 21 via the discharge roller 212 with the image surface facing downward (face down). Further, the tray 220 is rotated upward as shown by the two-dot chain line in FIG.
It can be set in a substantially upright state above 5. Therefore, in the case of face-down discharge, the sheet is discharged onto the ceiling plate 22 of the holding frame 21 and the ceiling plate 2 of the main body frame 1. For long size sheets, by setting the cover 11 at the angle (II), the sheet holder can function as a stand.

On the other hand, in order to perform face-up paper ejection, the tray 220 is placed in a substantially upright state with a slight incline toward the back, as shown by the dashed line in FIG. 15, and the cover 32 is opened. As a result, the switching claw 30 protrudes into the face-down paper discharge path, and the sheet conveyed from the discharge roller 211 is guided by the back surface 30b. At this time, the sheet is discharged onto the tray 220 with the image side facing the front side (face up).

Although not shown, it is necessary that a pair of rollers for discharging sheets to the tray 220 can be installed in the block 25. Also, the opening/closing operation of the cover 32 is controlled by the tray 22.
It may be linked to the opening/closing operation of 0.

In this case, during face-down paper ejection, the sheet is completely ejected onto the tray 220 covering the upper surface of the main body frame 1.

On the other hand, when this laser beam printer is configured with only face-down paper ejection, the paper ejection direction switching block 2
5, a tool guide block 40 is attached on the holding frame 21, as shown in FIGS. 16 and 17. In this case, the conveying force is applied to the sheet by the discharge roller 211, and the sheet is guided by the guide surface 41 and its course is changed to the front side. is discharged to the top.

As described above, in this embodiment, the sheet conveyance path is configured to substantially follow the inner surface of the main body frame 1, so that the printer as a whole becomes compact. especially,
In face-down paper ejection, the sheet is ejected toward the front side, that is, toward the operator, and it is convenient for the operator to take out the ejected sheet. The image forming cartridge 150 also includes a paper feeding mechanism 60 and a vertical conveyance path 80.
, and is surrounded by paper ejecting means 210, so that the internal space of the main body frame 1 is effectively utilized. Further, the fixing device 200 is disposed above the vertical conveyance path 80 and on the back side of the main body frame 1. Therefore, heat dissipation from the fixing device 200 is improved, and the risk of an operator inadvertently touching the fixing device is reduced during paper jam removal or maintenance, which will be described below.

Furthermore, in face-up paper ejection, the sheet is ejected onto the tray 220 with the image side facing the front where the operator is located, so the operator can immediately see the image of the ejected sheet in the same posture as when operating the printer. You can check it. Moreover, since the tray 220 is installed above the main body frame l in a substantially upright state, no floor space is required for installing the tray.

[Opening the Sheet Conveyance Path] The image forming cartridge 150 is rotatable upward together with the holding frame 21 in order to be attached to and detached from the main body frame 1 (see FIG. 3). The image forming cartridge 150 can be rotated to a substantially upright position (see FIG. 2). In this state, handling of paper jams and maintenance inside the main body are performed.

By the way, if the image forming cartridge 150 is configured so as to be able to rotate upward to open the sheet conveyance path as in this embodiment, and the transfer roller 180 is in constant pressure contact with the photosensitive drum 160, the sheet may become photosensitive. If the image forming cartridge 150 is sandwiched between the body drum 160 and the transfer roller 180 and also pinched by other conveying means, rotating the image forming cartridge 150 upward to open the conveying path may damage the sheet. There is a risk of scratches on the photoreceptor. Since the sheet conveyance means on the downstream side of the transfer section, that is, the fixing device 200 and the discharge roller 211 are attached to the holding frame 21 integrally with the image forming cartridge 150, the above-mentioned fear does not occur. On the other hand, on the upstream side of the transfer section, countermeasures are required in case a sheet is caught between the paper feed roller 61 and the pinch roller 70 and a paper jam occurs. Therefore, in this embodiment, a lever 71 is provided on the pinch roller 70,
It is rotatable about the support shaft 72 as a fulcrum. When the image forming cartridge 150 is in the image forming operation position (see FIG. 1), the lower surface of the tip 151a of the housing 151 comes into contact with the tip of the lever 71, and the pinch roller 70 is biased clockwise. It comes into contact with the paper feed roller 61. on the other hand,
When the image forming cartridge 150 is lifted upward, the lever 71 becomes free, and the pinch roller 70 rotates counterclockwise together with the lever 71 due to its own weight, and the paper feed roller 61
move away from By the above-described operation, the jammed sheet is released from being pinched between the paper feed roller 61 and the pinch roller 70, and damage to the sheet and photoreceptor is prevented.

[Optical System Unit] As shown in FIGS. 18 and 19, the optical system unit 100 includes, in a housing 101, a light source unit 110 consisting of a semiconductor laser and a collimator lens, a folding mirror 111, a polygon mirror 112, and a folding mirror 113.
, a toroidal mirror 114 and a sensor 115 for detecting a scan start position.

The laser beam is modulated based on image information and emitted from the light source unit 110, is scanned at a constant angular velocity on one plane by a polygon mirror 112 via a folding mirror 111, and is further transmitted from a toroidal mirror 114 to the housing via a folding mirror 113. The light enters the slit 152 of the image forming cartridge 150 through the window 105 of the image forming cartridge 101 and forms an image on the photosensitive drum 160.

A glass 106 is attached to the window part 105, and the first
A shutter 120 is installed as shown in the figure. The shutter 120 is rotatable about the bin 122, and
A lever portion 121 projects outward from the housing 101. When the image forming cartridge 150 is set at the image forming position, a protrusion (not shown) of the holding frame 21 comes into contact with the lever portion 121, and the shutter 120 opens the window 105. On the other hand, the holding frame 21
50, the restriction on the lever part 121 is released, and the shutter 120 rotates clockwise in FIG. 1 under its own weight, closing the window part 105.

The polygon mirror 112 is located on the bottom surface of the housing 101 and located between the recesses 102 on both sides of the flat part 103 (
(see Figure 20). polygon mirror 11
2nd grade optical components require precision in mounting position, so
It is attached to the flat part of the housing 101. Therefore,
A recess 102 provided for inserting a hand into the sheet storage portion 50 is formed in a portion where no optical component is attached.

In this embodiment, the laser beam is transmitted to the optical system unit 10.
The light is emitted from 0 toward the inner side of the main body frame 1.

Therefore, it is safe for the operator, and in this laser beam printer, when the holding frame 21 is lifted, a sensor (not shown) is activated, and the light source unit 11 is activated.
A safety circuit is incorporated to stop the emission of the laser beam from 0. Therefore, in case the shutter 120 -
This is a safety measure in case of. Furthermore, in the embodiment, the rear end portion 151b of the housing 151 of the image forming cartridge 150 is
The surface around the slit 152 was colored black.

If the imaging cartridge 150 is lifted while the laser beam is being emitted, the laser beam may be reflected toward the operator by the surface of the housing 151 that crosses the optical path. Therefore, by making the surface of the usable housing 151, on which the laser beam is reflected, a non-reflective surface, the risk of the operator being irradiated with the laser beam is avoided. Alternatively, the corresponding surface of the housing 151 may be subjected to sandblasting or the like to form a diffused reflection surface.

Further, in the optical system unit 100, a part of the optical path, that is, a part of the folding mirror 113 is arranged between the image forming cartridge 150 and the sheet storage section 50.

With this arrangement, the space within the main body frame 1 can be effectively utilized, and the printer as a whole can be made more compact.

As is clear from the above explanation, according to the present invention, the driven roller is brought into contact with the peripheral surface of the paper feed roller on the downstream side in the rotational direction,
Since the sheet sent out by the rotation of the paper feed roller is sandwiched between the paper feed roller and the driven roller and sent out almost upwards, the leading edge of the sheet almost does not go straight after the sheet is fed, and the sheet is immediately conveyed almost upwards. The route becomes shorter.

Therefore, the image forming apparatus is made smaller and the occurrence of paper jams is also reduced.

[Brief explanation of drawings]

The drawing shows a laser beam printer equipped with an embodiment of a paper feeding device according to the invention. FIG. 1 is a sectional view showing the internal structure of the printer, and FIGS. 2 and 3 are sectional views showing the image forming cartridge in a lifted state. FIG. 4 is an explanatory view showing the sheet placement state on the sheet tray, and FIG. 5 is a partial sectional view showing the cover of the sheet insertion opening. Fig. 6 is a front view of the paper feed mechanism, Fig. 7 is a graph showing the displacement of the push-up bar with respect to the angular displacement of the paper feed roller, and Fig. 8 is an operation showing the displacement of the push-up bar with respect to the angular displacement of the paper feed roller. It is an explanatory diagram. Fig. 9 is a sectional view of the image forming cartridge, Fig. 10 is a perspective view of the image forming cartridge, Fig. 11 is a perspective view of the M cartridge and holder, and Fig. 12 is a perspective view showing the image forming cartridge installed in the holder. It is a diagram. FIG. 13 is a sectional view of the paper discharge direction switching section, and FIGS. 14 and 15 are enlarged sectional views of the paper discharge direction switching block. FIG. 16 is a perspective view showing the sheet guide block, and FIG. 17 is a sectional view of FIG. 16. FIG. 18 is a sectional view of the optical system unit, FIG. 19 is a laser beam optical path diagram, and FIG. 20 is a perspective view of the optical system unit. l...Main frame, 50...Seat storage section, 6o
. . . Paper feeding mechanism, 61 . . . Paper feeding roller, 70 . . . Pinch roller (driven roller), 80 .

Claims (1)

[Scope of Claims] 1. A sheet accommodating section for accommodating a plurality of sheets in a stacked state, and a sheet accommodating section that is installed so as to come into contact with the leading edge of the uppermost surface of the sheets stacked in the sheet accommodating section, and that is arranged so as to be in contact with the leading edge of the top surface of the sheets stacked in the sheet accommodating section. A paper feed roller that feeds out the top layer sheet based on rotation, and a paper feed roller that abuts the circumferential surface of the paper feed roller on the downstream side in the rotational direction, and pinches the sheet fed by the paper feed roller with the paper feed roller so as to move the sheet approximately upward. A paper feeding device characterized by comprising: a driven roller that feeds the paper to a paper feeder;