JP3343841B2 - Paper feed mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed mechanism mounted on a printer or the like to feed sheets one by one to a printer.

[0002]

2. Description of the Related Art A conventional paper feed mechanism will be described below with reference to the drawings. FIG. 29 is a perspective view showing a conventional paper feed mechanism, and FIGS. 30, 31 and 32 are explanatory views of the operation of the conventional paper feed mechanism.

The paper feed mechanism 1 shown in FIG. 29 is for feeding paper on a paper feed stage described later in the direction of arrow A.
An unillustrated frame of the paper feed mechanism 1 is provided with an entrance sensor 2 for detecting the paper fed from the paper supply stage, and is located downstream of the entrance sensor 2 in the medium transport direction.
A pressure roller 3 and a registration roller 4, which is disposed in pressure contact with the pressure roller 3 and is made of rubber and has an outer peripheral portion rotated by transmission of a driving force, are disposed.

[0004] The fed sheet is pressed against a wedge-shaped portion in a pressure contact portion between the pressure roller 3 and the registration roller 4, and the sheet skew during conveyance is corrected.

The pressure roller 3 and the registrar
The pressing amount of the sheet against the roller 4 is controlled by conveying the sheet by a fixed amount after the entrance sensor 2 detects the sheet, thereby absorbing slippage during the conveyance. Hereinafter, the skew correction operation of the sheet after the entrance sensor 2 detects the sheet is referred to as a registration operation.

A feed motor 5 is attached to a frame (not shown), and a gear 5a of the feed motor 5 is engaged with a reduction gear 6. A feed gear 7 meshes with a gear 6a of the reduction gear 6, and a feed shaft 9 is attached to the feed gear 7 via a one-way clutch 8.

[0007] Here, the one-way clutch 8 is
When the feed gear 7 rotates in the direction of arrow B, the driving force is transmitted to the feed shaft 9 to rotate the feed shaft 9 in the direction of arrow B. When the feed shaft 9 rotates in the direction of arrow B, the action of the one-way clutch 8 (the idle clutch 8 idles) prevents the feed gear 7 from rotating.

[0008] A feed roller 11 is attached to the feed shaft 9 via a one-way clutch 10. The one-way clutch 10 locks when the feed shaft 9 rotates in the direction of arrow B, and
The drive force of the drive shaft 9 is transmitted to the feed roller 11,
The feed roller 11 is rotated in the direction of arrow B. Also,
After the registration operation, the paper is conveyed by the pressure roller 3 and the registration roller 4, so that the feed shaft 9 is moved.
When the force for rotating the feed roller 11 in the direction of arrow B is applied in a state where the feed roller 11 is stopped, the feed roller 11 idles with respect to the feed shaft 9 by the action of the one-way clutch 10. It is possible.

At this time, the one-way clutch 10
Generates a weak idling torque to the feed shaft 9, so that the feed roller 11 rotates,
The drive shaft 9 also rotates.

At both ends of the feed shaft 9, paper feed stage control cams 12 are mounted so as not to rotate with respect to the feed shaft 9. The cam surface of the paper feed stage control cam 12 has a paper feed stage 13.
Is in contact with some of the The paper feed stage 13 is supported by a shaft (not shown) so as to be rotatable about a shaft hole 13a, and can be moved closer to or away from the feed roller 11. .

One end of a paper feed bias spring 14 is attached to the paper feed stage 13, and the paper feed bias spring 14 pushes up the paper feed stage 13 so that the paper feed stage 13 can be seen. Press against the drawer 11. A friction portion 15 is adhered to a surface of the sheet feeding stage 13 facing the feeder 11.

When the feed stage control cam 12 rotates, the feed stage 13 moves away from the feeder 11 against the urging force of the feed bias spring 14, and the feed stage 13 is fed. The paper bias spring 14 approaches the feed roller 11 by the urging force. When the paper feed stage 13 approaches the feed roller 11, the sheet on the paper feed stage 13 is pressed against the feed roller 11. Then, by the rotation of the feeder 11, the sheets on the sheet feeding stage 13 are fed one by one from above.

A separation frame 16 is rotatably supported by a shaft (not shown) at a lower portion of the feeder 11 with a shaft hole 16a serving as a rotation fulcrum. -It is possible to approach or leave the camera 11.

The feed frame of the separation frame 16
A separation friction material 17 is adhered to the surface facing the roller 11, and the separation frame 16 is pressed against the feed roller 11 by a separation bias spring 18. Also,
A wedge-shaped portion is formed at the pressure contact portion between the drawer 11 and the separation friction material 17.

A state in which the leading end of the feed stage control cam 12 abuts on the feed stage 13 as shown in FIG. 30 and the feed stage 13 is separated from the feeder 11 is fed. The home position of the paper stage control cam 12 is set.

When the paper feed stage control cam 12 rotates in the direction of arrow B from the home position and reaches the position shown in FIG. 31, the paper on the paper feed stage 13 is fed.
It is pressed against the wire 11. And feeder 11
When is rotated, one sheet is fed out. The paper is
It is pushed into the wedge-shaped portion formed by the pressure contact portion between the pressure roller 3 and the registration roller 4, and the skew is corrected there. Next, when the registration roller 4 starts driving, the sheet is conveyed, and the feed roller 11 is rotated by the sheet. At this time, due to the idling force of the one-way clutch 10 of the feed roller 11, the feed shaft 9 is turned with a small torque, and the feed stage control cam 12 integrated with the feed shaft 9 is also turned.

When the paper feed stage control cam 12 continues to rotate and comes into contact with the paper feed stage 13 as shown in FIG. 32, the idling force of the one-way clutch 10 reduces the paper feed stage.
The paper feed stage control cam 12 stops after losing to the page 13. This position is referred to as a mechanical balance position. At this time, the paper on the paper feed stage 13 is fed back.
It is pressed against the la 11.

At the time of feeding the paper, even if there is a slip between the feeder 11 and the paper, after feeding one paper,
It is always in mechanical balance.

Thereafter, a driving force is applied to rotate the paper feed stage control cam 12 to the position before the feeding operation shown in FIG. 30 again. By performing the above operation, once the sheet feeding operation is performed, the sheet feeding stage 13 is returned to the home position.

[0020]

In the above-mentioned conventional paper feeding mechanism, the one-way clutch incorporated in the feed roller or the feed gear idles when the paper is pulled in the direction in which the paper is transported. Lock to pull the paper in the opposite direction. When the jammed sheet is taken out, the sheet is pulled in the direction opposite to the transport direction. Therefore, when the jammed sheet is taken out, the feed roller is in a locked state. Therefore, a large force is required to take out the sheet while overcoming the frictional force of the feed roller, giving a user anxiety and causing the thin sheet to be torn.

Further, the separating friction material is always pressed against the feed roller, but if the separating friction material is in a pressed state for a long period of time, oil will seep out from the feed roller (bleeding phenomenon) and the separated friction will occur. Infiltration into the material causes the separation friction material to expand. Then, the separating friction material rises from the bonding surface with the feed roller, and the wedge-shaped portion formed at the press contact portion between the feed roller and the separating friction material is distorted, and the paper cannot be normally separated. was there.

Furthermore, when the feed stage control cam is returned from the mechanical balance position to the position before the feeding operation after feeding one sheet of paper, the feed shaft is driven. Turned. Therefore, the next sheet to be fed out is fed out by a fixed amount. Therefore, when a user attempts to replace a sheet, one sheet is always sandwiched between the feed rollers, and when removing one sheet of paper sandwiched by the feed roller, the jam is removed. There is a problem that the same problem as when the generated paper is taken out occurs.

Further, since the paper feed stage is pressed against the feed roller during the mechanical balance state after feeding one sheet of paper, the feeding margin of the thick paper is raised. If the pressing force of the paper feed stage is set to a large value, double feeding occurs when thin paper is fed out, and there has been a problem that the paper used must be restricted.

[0024]

In order to solve the above-mentioned problems, a first solution provided in the present invention is a feeder for feeding out a medium, a medium loaded with the medium, and a pressure contact with the feeder. The stage is biased in the direction of rotation, and is rotatably provided. When the stage is engaged with the stage, the stage is pressed in a direction away from the feed roller, and the stage is pressed. A lever provided with a step for holding the lever away from the drawer, and a bias attached to the lever for urging the lever in a direction for pressing and holding the stage away from the feeder. The member is provided coaxially with the feeder, and when rotated, abuts against the lever to make the stay against the urging force.
A first cam portion that rotates in a direction opposite to a direction in which the lever is pressed; and a first cam portion that is formed integrally with the first cam portion and that rotates to contact a stage that is not held by the lever. A second cam portion for rotating the stage in a direction away from the feeder, and a first cam in a state where the lever stage holds the stage. When the cam rotates and pushes the lever, the lever is disengaged from the stage and the medium on the stage is pushed out by the feeder and fed out. The second cam portion rotates the stage in a direction away from the feeder to a predetermined position, the lever rotates by the urging force, and the lever stage presses the stage to push the stage. (1) to separate the feeder from the feeder and maintain the state.

When the feed roller rotates to feed the paper while the lever stage holds the stage,
At the same time, the first cam rotates to rotate the lever in the direction opposite to the direction in which the stage is pressed. Then the lever
The stage is disengaged from the stage, the stage rotates in the direction of the feeder, and the medium on the stage is pushed out by the feeder and fed out. Then, when the cam further rotates, the second cam portion presses the stage, and rotates in a direction away from the feed roller to a predetermined position. Then
Since the stage is lowered, the lever is rotated by the urging force, and the lever stage rides on and engages with the stage to release the stage from the feed roller. Hold. Therefore, when the sheet is fed, the sheet feeding stage automatically returns to the position before feeding. Further, by adjusting the shapes of the lever and the control cam, the time for pressing the medium loaded on the stage against the feed roller can be made variable.

A second solution provided by the present invention to solve the above-mentioned problems is a feeder for feeding out a medium,
A stage on which a medium is loaded and which is urged in a direction of pressing against the feeder, and a stage which is pressed against the feeder and rotates in a direction away from the feeder. As a result, a separation frame which is pressed by the stage and rotates in a direction away from the feeder, and is provided rotatably,
When the stage is engaged, the first stage presses the stage in the separating frame direction and holds the stage at a position away from the feeder. A second stage for pressing the stage further in the direction of the separation frame than the first stage and rotating and holding the separation frame in a direction away from the feeder. And the direction attached to the lever to press and hold the stage in the direction of the separating frame. When the first stage and the stage are disengaged from each other, the second stage and the stage are disengaged. A biasing member for biasing the lever in a direction in which the lever engages with the stage, and the stage rotates in the direction of the separating frame while the first stage holds the stage. When the first stage is disengaged from the stage, the second stage presses the stage, which presses the separation frame to separate the stage from the feeder. - is to hold its state release the beam.

When the stage is rotated in the separating frame direction while the first stage is holding the stage, the lever is rotated by the urging force of the urging member, and the first stage is rotated. The step is disengaged from the stage, and the biasing force causes the second step to engage the stage, further pressing the stage in the direction of the separating frame. Then, the stage presses the separation frame to release the separation frame from the feeder, and the state is maintained.

[0028]

Embodiments of the present invention will be described with reference to the drawings. Elements common to the drawings are denoted by the same reference numerals. FIG. 1 is a perspective view showing a paper feeding mechanism according to an embodiment of the present invention, and FIGS. 2 and 3 are explanatory views showing the relationship between a lever and a paper feeding stage in the embodiment of the present invention. FIGS. 5, 6, and 7 are explanatory views of the operation of the paper feeding mechanism according to the embodiment of the present invention, FIG. 8 is a perspective view showing a separation frame according to the embodiment of the present invention, and FIG. It is a top view which shows the separation frame in a form. 4 and 5 and FIGS. 6 and 7 show the operation at the same time.

The paper feed mechanism 21 shown in FIG. 1 is for feeding the medium (paper) on the paper feed stage 35 in the direction of arrow A. A frame (not shown) of the paper feeding mechanism 21 includes a paper feeding station.
Entrance sensor 2 for detecting the paper fed from the paper 35
The entrance sensor 22 includes a lever portion 22a and a sensor portion 22b. When a sheet passes, the lever portion 22a rotates, and the sensor portion 22b detects the lever portion 22a. The disappearance of the sheet detects the conveyance of the sheet.

Downstream from the entrance sensor 22 in the medium transport direction, a pressure roller 23 made of metal and a pressure roller 23 are disposed opposite to the pressure roller 23.
An outer peripheral portion which is pressed against the roller 23 and rotates by transmission of the driving force is provided with a resist roller 24 formed of rubber 24a having a high abrasion coefficient and a high friction coefficient.

Then, the fed sheet is pressed against a wedge-shaped portion in a pressure contact portion between the pressure roller 23 and the registration roller 24, and the sheet skew during conveyance is corrected.

The pressing amount of the medium to the pressure roller 23 and the registration roller 24 is controlled by conveying a predetermined amount of paper after the entrance sensor 22 detects the paper, and the conveying amount is determined by the pressing amount. It absorbs the slippage at the time.

A feed motor 25 is attached to a frame (not shown), and a gear 25a of the feed motor 25 is engaged with a reduction gear 26. Gear 26 of reduction gear 26
a, a feed gear 27 meshes with the feed gear 27. The feed gear 27 is connected to the feed gear 27 via a one-way clutch 28.
A shaft 29 is attached.

Here, the one-way clutch 28 locks and transmits the driving force to the feed shaft 29 when the feed gear 27 rotates in the direction of the arrow B, thereby rotating the feed shaft 29 in the direction of the arrow B. When the feed shaft 29 rotates in the direction of arrow B, the unway clutch 28 idles, so that the feed gear 27 does not rotate. That is, the feed shaft 29 can rotate in the direction of arrow B without driving the feed gear 27.

In the vicinity of the center of the feed shaft 29, a feed roller 31 whose outer peripheral portion is formed of rubber having a high abrasion resistance and a high friction coefficient is attached via a one-way clutch 30. And the one-way clutch 30 is free
When the feed shaft 29 rotates in the direction of arrow B, the lock is performed, and the driving force of the feed shaft 29 is
1 to rotate the feed roller 31 in the direction of arrow B.

When the feed roller 31 rotates in the direction indicated by the arrow B, the one-way clutch 28 has a 100-degree rotation so that the feed shaft 29 rotates in the same direction with a small torque.
To 200 gcm.

After the resist operation, the pressure roller 23,
When the sheet is conveyed by the registration roller 24 and a force is applied to rotate the feed roller 31 in the direction of arrow B with the feed shaft 29 stopped,
By the action of the one-way clutch 30, the feed-through
The roller 31 can idle with respect to the feed shaft 29.

At this time, the one-way clutch 10
Generates a weak idling torque to the feed shaft 29, so that the feed shaft 29 rotates with the rotation of the feed roller 31.

At both ends of the feed shaft 29, feed stage control cams (hereinafter referred to as control cams) 32 are fixed by non-rotatable fixing pins 37 with respect to the feed shaft 29. Control
The cam 32 is formed of a two-stage cam-shaped portion consisting of an inner first cam portion 32a and an outer second cam portion 32b. At both ends of the feed shaft 29, levers 38, which are cam followers, are attached to a frame (not shown) so as to be rotatable around a pivot point 38a. And this lever 38
When the groove 38d is pressed by the first cam portion 32a of the control cam 32, it rotates in the direction of arrow E against the biasing force of a bias spring 39 described later.

An end of a bias spring 39 is attached to one end of the lever 38, and urges the lever 38 in the direction of arrow D.

As shown in FIG. 2, a first step 38b and a second step 38c are formed below the lever 38, and the first step 38b and the second step 38c are respectively formed on the first step 38b and the second step 38c. As shown in FIGS. 2 and 3, the projection 35b of the paper feed stage 35 may be engaged, and this state is maintained by the biasing force of the bias spring 39.

The paper feed stage 35 is supported by a shaft (not shown) so as to be rotatable about a pivot point 35a, and the leading end thereof can be separated from and connected to the feed roller 31. ing. One end of a paper feed bias spring 36 is attached to the convex portion 35b of the paper feed stage 35. The paper feed bias spring 36 pushes up the paper feed stage 35 and is loaded on the paper feed stage 35. The pressed paper is pressed against the feeder 31. A friction material 40 is adhered to a surface of the paper feed stage 35 facing the feeder 31. The friction material 40 holds the last sheet on the sheet feeding stage 35, thereby preventing double feeding when the number of sheets stacked on the last sheet is low.

A feed stage home switch 45 is provided below the feed stage 35. The feed stage home switch 45 detects the feed stage 35. Is in a state where the paper feed stage 35 is positioned at a home position described later.

As shown in FIG. 2, while the first step 38b of the lever 38 is engaged with the projection 35b of the paper feed stage 35, the supply of the bias is performed by the biasing force of the bias spring 39. The paper stage 35 is held at the home position shown in FIGS. 4 and 5, and as shown in FIG.
While the second stage 38c is in contact with the convex portion 35b of the paper supply stage 35, the paper supply stage 35 is further lowered to come into contact with an arm portion 41b of the separation frame 41 described later. The separation frame 41 is held at the jam reset position shown in FIGS. The projection 35 of the sheet feeding stage 35 is also provided.
b is the second cam portion 32b of the control cam 32
May come into contact with each other, and at that time, the sheet feeding stage 35 rotates in the direction of arrow H, and is further lowered from the home position.

As shown in FIG. 5, the home position of the paper feed stage 35 is such that the paper feed stage 35 is lowered, but a gap X between the paper feed stage 35 and the separation frame 41 is provided. And there is no contact, and the feed stage home switch 45
Is a state in which the sheet feeding stage 35 is detected. on the other hand,
As shown in FIG. 7, the jam reset position of the paper feed stage 35 is such that the paper feed stage 35 is further lowered and the separation frame is moved.
In this state, the camera 41 is being rotated in the direction of pushing down (the direction of arrow K).

The separation frame 41 is located below the feed roller 31 and at a position facing the feed roller 31.
Is attached to a frame (not shown) so as to be rotatable around a rotation fulcrum 41a. When the paper feed stage 35 is rotated in the arrow H direction, the paper feed stage is attached to the separation frame 41. An arm 41b pressed by the jaw 35 is formed. As shown in FIGS. 8 and 9, a separation friction member 42 is bonded to a surface of the separation frame 41 facing the feeder 31. In FIG. 1, one end of a separation bias spring 43 is attached to the separation frame 41, and the separation friction member 42 is pressed against the feed roller 31 by the urging force of the separation bias spring 43. The feed roller 31 and the separation friction material 42 form a wedge-shaped portion at a portion facing each other, and a paper 52 is formed on the wedge-shaped portion.
, The sheets 52 stacked on the sheet supply stage 35 are fed out one by one from the sheet stacked on the top.

As shown in FIG. 8, a separation guide 44 is attached to the side of the separation frame 41 upstream of the separation friction member 42 in the sheet transport direction. This separation guide 44
Is for smoothly guiding the paper 52 to the separation friction material 42, and is formed of a stainless steel plate for a spring having a thickness of about 0.1 mm. Both ends in the width direction of the separation guide 44 are bent to form an arm 44a.
Is in contact with a later-described sheet feeding guide 49 that positions the separation guide 44 in the left-right direction due to weak elasticity.

In FIG. 1, the tray 4 on which the sheets 52 are stacked is located immediately upstream of the sheet feeding stage 35 in the sheet conveying direction.
6 is provided, and this tray 46 is
Can be rotated about the center. This tray 46
Is closed when the paper feeding operation is not performed.

One end of a stay 47 is fixed to the tray 46, and a groove 47a is formed in the stay 47. A post 48 fixed to a frame (not shown) is engaged with the groove 47a, and the groove 47a is slidable with respect to the post 48.

A protrusion 47b formed at the other end of the stay 47
When the stay 47 moves in the direction of arrow G shown in FIG.
It can contact the lever 38 and stay 47
Keeps moving in the direction of arrow G, the lever 38 is rotated in the direction of arrow D shown in FIG.

Referring to FIGS. 4, 5 and 10, the paper feed
A paper feed guide 49 for guiding the paper 52 is provided from the lower portion of the paper 35 to the downstream of the paper supply stage 35 in the paper transport direction. 50 are provided. By the paper feed guide 49 and the paper feed guide 50, the paper 52 fed by the feed roller 31 is guided to a wedge-shaped portion formed by the registration roller 24 and the pressure roller 23.

The end of the paper feed guide 49 is approximately 0.3 mm
One end of a resist film 51 formed of a thick elastic polyester film is attached. The other end of the resist film 51 is disposed so as to substantially contact the leading end of the paper feed guide 50. As a result, the paper 52 is sandwiched between the paper feed guide 50 and the resist film 51 immediately before pressing the paper 52 against the wedge-shaped portion. Then, the waving of the sheet 52 is corrected.

Next, the operation of taking out the paper 52 in which a jam has occurred in the above configuration will be described with reference to FIGS. 1, 2, 3, 4, 5, 6, 6, 7, 11, and 12. . 11 and 12 are explanatory views of the operation of the paper feed mechanism according to the embodiment of the present invention. 11 and 12 show the operation at the same time.

In FIG. 4, the lever 38 is upright, and the paper feed stage 35 is held by the first stage 38b of the lever 38 as shown in FIG. Is located at the home position away from the feeder 31. Further, as shown in FIG. 5, there is a gap X between the paper feed stage 35 and the separation frame 41,
Not in contact. At the same time, the paper feed jam occurs in which the entrance sensor 22 has not detected the passage of the paper within the predetermined paper feed time.

The operation of taking out the jammed sheet 52 in this state will be described.

First, the operation of shifting the paper feed stage 35 to the jam reset position will be described. In FIG. 4, when the tray 46 is rotated in the direction of arrow M, the stay 4
7 is moved in the direction of arrow G while engaging with the post 48, and as shown in FIG.
Contact 8 When the stay 47 continues to move in the direction of arrow G, the protrusion 47b of the stay 47 rotates the lever 38 in the direction of arrow D. Then, the second stage 38c of the lever 38 presses the convex portion 35b of the paper feed stage 35, and further lowers the paper feed stage 35 from the home position of the paper feed stage 35, Position at the jam reset position. Then, by the biasing force of the bias spring 39,
Hold that state.

At this time, as shown in FIG.
The tip 35c of the jaw 35 rotates in the direction of the arrow H, and pushes down the arm 41b of the separation frame 41. The separation frame 41 rotates in the direction of the arrow K about the fulcrum 41a. The gap 41 is formed between the feed roller 41 and the separation friction material 42 apart from the feed roller 31.

On the other hand, as another method of moving the paper feed stage 35 from the home position to the jam reset position shown in FIGS. 6 and 7, there is a method of directly pushing down the paper feed stage 35. When the paper feed stage 35 is pressed down, the lever
The second step 38c of 38 slides on and engages with the projection 35b of the paper feed stage 35 by the biasing force of the bias spring 39, and holds the paper feed stage 35 at the jam reset position. At the same time, the separation frame 41 and the separation friction member 42 separate from the feed roller 31.

The above two operations require that the lever 38 can rotate to the jam reset position. For this purpose, the paper feed stage 35 needs to be positioned at the home position. Paper feed stage 3
5 is not positioned at the home position, for example, the lever 38 is at the paper feed stage control cam 32.
Is rotated by the first cam portion 32a of
Even if the stay 47 moves in the direction of arrow G and comes into contact with the stay 47, the stay 47 cannot rotate because the pressing force is not sufficiently applied.

Therefore, the paper feed mechanism 2 in the present embodiment
1, the paper feed stage home switch 45 shown in FIG. 1 is turned on when the power is turned on or when a paper feed jam occurs.
If the feed stage 35 is not detected, it is determined that the paper feed stage 35 is not positioned at the home position.
The cam 32 is rotated in the direction of arrow B to return to the home position shown in FIG.

It should be noted that the control cam 32 has a paper feed stage home position switch 45 which is connected to the paper feed stage 35.
Is detected and then rotated for a certain period of time, so as to be in the upright state shown in FIG.

After the paper feed stage 35 is positioned at the jam reset position, the tray 46 is returned to the original position. 6 and 7
In this case, even if the tray 46 is rotated in the direction of arrow N and returned to the original position, the second step 38c of the lever 38 is in contact with the convex portion 35b of the sheet feed tray 35, and Di 3
5 is held at the jam reset position, the jam reset position of the paper feed stage 35 continues to be held, and the feed roller 31 and the separation friction material 42 are separated from each other as shown in FIG. Has become.

In the present paper feed mechanism 21, when the paper 52 is pulled in the transport direction, the one-way clutch 2
When the sheet 52 is pulled in a direction opposite to the transport direction, both the one-way clutches 28 and 30 are locked. Therefore, in order to rotate the feed roller 31, the paper feed motor 25 must be driven.
Overcoming the residual torque of the feed motor 25 and feeding
A large force is required to rotate the roller 31 in the direction opposite to the paper transport direction. Removing the jammed paper 52 corresponds to an operation of pulling the paper 52 in the direction opposite to the transport direction, thereby giving an uneasiness to the operator and, at the same time, causing a danger of tearing with thin paper. By the jam reset operation described above, the paper 52 is
Since the drawer 29 is in a free state, the jammed sheet 52 can be easily taken out.

In FIG. 11, the tray 46 is further moved by the arrow M
When the tray 46 is turned in the direction shown in FIG. 4 and is erected as indicated by a broken line, the notches formed in the tray 46 are fitted into the protrusions formed in the frame (not shown), so that the tray 46 is locked. Since the tray 46 also serves as a front cover of the paper feed mechanism 21, this state is a state in which the front cover is closed, that is, a non-use state in which the main paper feed mechanism 21 is not used. At this time, the second stage 38 of the lever 38
c engages with the convex portion 35b of the paper feed stage 35, and pushes down the paper feed stage 35 to a position where the separation frame 41 is rotated, and holds that state. In the above, the feed roller 31 is separated from the separation friction material 42 which is pressed against the feed roller 31 when the jammed sheet 52 is removed and the paper feed mechanism 21 is not used. Can be.

Next, the sheet feeding operation will be described with reference to FIGS. 13, 14, 15, 16, 17, 17, 18, 19, 20, and 2.
1, FIG. 22, FIG. 23, FIG. 24, FIG. 25, FIG. 26, FIG.
7, will be described with reference to FIG. 13, 14, and 1
5, FIG. 16, FIG. 17, FIG. 18, FIG. 19, FIG. 20, FIG.
1, FIG. 22, FIG. 23, FIG. 24, FIG. 25, FIG. 26, FIG.
7 and 28 are explanatory views of the operation of the paper feeding mechanism according to the embodiment of the present invention. 13 and 14, and FIGS. 15 and 1
6, FIGS. 17 and 18, FIGS. 19 and 20, FIGS. 21 and 2
2, 23 and 24, 25 and 26, 27 and 28
Are operations at the same time.

The sheet feeding operation includes the sheet hopping / registering operation described with reference to FIGS. 13 to 26, and FIGS. 27 and 28.
And a control cam reset operation described in FIG. Here, the sheet hopping / registration operation means that the feed roller 31 is rotated by the driving force of the paper feed motor 25, and the press contact between the stopped registration roller 24 and the pressure roller 23 is stopped. Paper 5 on the wedge-shaped part to be formed
This is the operation until the paper skew is corrected by pressing 2. On the other hand, the control cam reset operation means that after the registration operation is completed, the rotation of the feed roller 31 is stopped by stopping the driving of the feed motor 25, and then the registration roller 2 is stopped.
4 is rotated and the paper 52 is conveyed.
2 is rotated by the driving force generated by the conveyance of the sheet 52, and the feed roller 3
In this operation, the feed shaft 29 is rotated by the idling torque of the one-way clutch 30 incorporated in the feed shaft 1 and the feed stage control cam 32 operating integrally with the feed shaft 29 is returned to the home position.

First, the state shown in FIGS. 13 and 14 is a state in which the tray 46 is opened and the sheets 52 are stacked in order to start using the sheet feeding mechanism 21 from an unused state.

When the feed motor 25 shown in FIG. 1 is driven in the direction of arrow B, a feed gear 27
Rotates in the direction of arrow B. At the same time, the one-way clutch 28 press-fitted into the feed gear 27 locks and rotates the feed shaft 29 in the direction of arrow B.

When the feed shaft 29 rotates in the direction of arrow B, the one-way clutch 30 locks, and the control cam 32 integrally attached to the feed shaft 29 starts rotating in the direction of arrow B, as shown in FIG. To
The first cam portion 32a of the control cam 32 is lever-3.
8 abuts against the groove 38d. When the control cam 32 is rotated in the direction of arrow B as it is, as shown in FIG. 17, the lever 38 rotates in the direction of arrow E around the rotation fulcrum 38a, and the paper feed stage 35 and the lever are rotated. The surface in contact with 38 transitions from the second step 38c to the first step 38b. The paper feed stage 35 is raised from the jam reset position shown in FIG. 16 to the home position shown in FIG. 18 by the urging force of the paper feed bias spring 36, and the separation frame 41 is moved to the separation bias spring. With the urging force of 43, the feed roller 3 is rotated about the rotation fulcrum 43a.
The feed roller 31 rotates in one direction, and the separated feeder 31 and the separated friction material 42 come into contact with each other.

Further, when the lever 38 rotates in the direction of arrow E, as shown in FIG.
8, the first stage 38b is released, and rotates in the direction of arrow J about the rotation fulcrum 35a. As shown in FIGS. 19 and 20, the paper 52 stacked on the paper feed stage 35 is rotated. The top sheet 52 comes into pressure contact with the rotating feed roller 31. Then, paper feeding in the direction of arrow A is started.

Since the paper feed stage 35 has been raised, the paper 52 is applied with a strong force to the feed roller 31 for a short time during which the control cam 32 rotates from the position shown in FIG. 19 to the position shown in FIG. Is pressed. Therefore, cardboard and OH
Generally, it is possible to feed out even a sheet such as a P sheet, a postcard, an envelope, etc. which is generally slippery on the feed roller 31.

On the other hand, if the paper 52 is pressed against the feed roller with a strong force for a long time, the thin paper can be easily fed in a double feed, so that the control cam 32 rotates to the position shown in FIG. Then, the second cam portion 32b of the control cam 32 comes into contact with the convex portion 35b of the paper feed stage 35, and pushes down the paper feed stage 35 as shown in FIGS.

As shown in FIG. 23, the second cam portion 32b of the control cam 32 rotates to the lowest point of the stroke, and pushes down the paper feed stage 35 (paper feed stage 35).
Is 0.1 mm to 0.3 mm more than the home position
mm lower point). Then, the first stage 3 of the lever 38
8b is rotated in the direction of arrow D by the biasing force of the bias spring 39, and rides on and engages with the convex portion 35b of the paper feed stage 35.

As shown in FIG. 25, the control cam 3
2 is pulled by the sheet 52 and continues to rotate as it is, but the lever 38 does not move, so that the sheet feeding stage 35 is kept at the home position.

As shown in FIGS. 25 and 26, when the sheet 52 reaches the entrance sensor 22 and the lever 22a is rotated, the sensor 22b causes the sheet 52 to move to the registration roller 2.
3 and the arrival just before the pressure roller 24 are transmitted to a control unit (not shown). Then, the control unit rotates the feed roller 31 by a fixed amount, so that the leading end of the sheet is fed to the sheet feed guide 50 and the resist film 5 shown in FIG.
1, where the waving of the sheet 52 is corrected. Thereafter, the leading end of the sheet is guided by the smooth metal surface of the pressure roller 24 and
3 is pressed against a wedge-shaped portion formed by a pressure contact portion of the pressure roller 24. Before arriving at the registration rollers 23 and the pressure rollers 24, the paper 52 is corrected for waving, so that the registration rollers 23 and the pressure rollers 24 can satisfactorily correct the paper skew when the paper is fed. Done.

Since the paper feed route of the paper feed mechanism 21 and the like often has a straight and short paper conveyance route, the feed
The leading end of the sheet 52 fed out by the stirrer 31 is likely to be wavy. Normally, when the paper 52 is pressed against a wedge-shaped portion formed by the corrugated paper 52 and the pressure roller 24, the corrugated portion of the paper 52 hits against the rubber of the registration roller 23, and the paper 52 is formed only halfway through the wedge shape. Cannot be inserted, and good skew correction cannot be performed.

However, in the paper feed mechanism 21, just before pressing the paper 52 against the wedge-shaped portion, the paper feed guide 50
And the resist film 51 sandwich the sheet 52 to correct the waving of the sheet 52, so that a good sheet skew can be obtained at the time of feeding.
Correction can be performed.

Next, a control cam reset operation by sheet conveyance after the sheet registration operation will be described with reference to FIGS. 27 and 28. FIG.

After the completion of the sheet registration operation, the sheet feeding motor 25
Is stopped, and the rotation of the feed roller 31 is stopped. Next, as shown in FIG. 27 and FIG.
Is driven in the direction of arrow C, and the sheet 52 is conveyed in the direction of arrow A. Conversely, the feed roller 31 is rotated in the direction of arrow B by the driving force generated by the sheet conveyance. Feed roller 31
When the feed shaft 29 also rotates in the direction of arrow B due to the low idling torque of the one-way clutch 30 incorporated in the motor, the control cam 32 integrally mounted on the feed shaft 29 also rotates in the direction of arrow B with low torque.

When the control cam 32 rotates to the position shown in FIG. 27, the first cam portion 32a of the control cam 32 comes into contact with the groove 38d of the lever 38. Since the lever 38 is held by the biasing force of the bias spring 39, the control cam 32 cannot be rotated with the low idle torque of the one-way clutch 30, and the one-way clutch 30 idles to feed the paper. The control cam 32 is in a stopped state.

Thereafter, the sheet is conveyed by the rotation of the registration roller 24, so that the feed roller 31 is pulled and rotated by the sheet 52 until the sheet 52 passes the feed roller 31. -38 and control cam 32
Holds the state shown in FIG.

The positions of the lever 38 and the control cam 32 shown in FIG. 27 are the same as those shown in FIG. 17, and have returned to the same positions as before the start of the sheet feeding. Thereafter, the paper feeding operation is continuously performed by repeating the processes from FIG. 17 to FIG.

In this embodiment, when a paper jam occurs, the tray 46 is moved by a predetermined angle.
Since the feed roller 31 and the separation friction material 42 can be separated from each other, the jammed sheet 52 can be easily taken out.

Further, when the paper feeding mechanism 21 is not used together with the time when the jammed paper 52 is removed,
Drawer 31 and separating friction material 4 used by pressing against it
2 can be kept apart. As a result, the paper feed mechanism 2
When the feed roller 1 is not used, the feed roller 31 and the separation friction material 42 used by being pressed against the feed roller 31 can be separated from each other. It is possible to prevent the separation friction material 42 from being deteriorated, expanded or deformed due to the seepage of oil from the feed roller 31 by keeping the 42 pressed.
Paper feed failure due to deformation of the feed roller 31 and the separation friction material 42 caused by the pressing can be prevented.

After the sheet is fed out, the control cam 3 is driven by the low idling torque of the one-way clutch 30 which rotates as the sheet 52 is conveyed by the registration roller 24.
When the roller 2 rotates, the control cam 32 returns to the same position as before the sheet feeding operation. That is, after one sheet of paper 52 is fed, the control cam 32 always returns to the same position as before the sheet feeding operation. As a result, after feeding the paper,
There is no occurrence of feeding the next sheet 52 to return the control cam 32 to the position before the sheet feeding operation.

Therefore, when the user intends to replace the sheet, the sheet is not sandwiched between the feed rollers, so that the sheet can be easily taken out.

A lever for holding the position of the paper feed stage 35
38 and the control cam 32,
By adjusting the shapes of the lever 38 and the control cam 32, the time for pressing the sheet supply stage 35 on which the sheets 52 are to be loaded onto the feed roller 31 can be made variable. In the present embodiment, as shown in FIG. 19, the lever 38 is detached from the projection 35b of the paper feed stage 35 by the first cam portion 32a of the control cam 32, so that the paper feed stage Feed the paper 52 on 35
By increasing the pressing force on the paper 31 to increase the repetitive output of the thick paper, the paper 52 on the paper feed stage 35 is immediately thereafter.
Can be prevented by reducing the force for pressing thin paper against the feeder 31, so that the stability of feeding out thick or thin paper can be improved, and the width of usable paper can be increased. it can.

Immediately before the paper 52 reaches the wedge-shaped portion formed by the contact portion between the registration roller 24 and the pressure roller 23, the paper 52 is sandwiched between the paper guide 50 and the resist film 51. By correcting the waving of the sheet 52 at the time of feeding the sheet, the sheet 52 can be pressed to the depth of the wedge-shaped portion. Therefore, when the registration roller 24 is rotated and the sheet 52 is conveyed, it is possible to satisfactorily correct the sheet skew.

Further, an elastic member is used for the separation guide 44 for guiding the paper 52 to the separation friction material 42, and the separation frame is separated.
Arm 44a by bending the separation guide 44 in the width direction of the
The paper 52 passes between the feed roller 31 and the separation friction material 42 by contacting the arm 44a with a paper feed guide 49 for positioning the separation frame 41 in the width direction. At the time, the separation frame 4 is separated via the separation friction material 42.
1 can be reduced. Therefore, it is possible to reduce the noise generated by the slight vibration of the separation frame 41 during the sheet conveyance.

[0090]

Since the present invention is configured as described above, the following effects can be obtained.

A feeder for feeding out the medium, a stage on which the medium is loaded and urged in a direction of pressing against the feeder, and a stage rotatably provided, and associated with the stage. When combined, the stage is pressed in a direction away from the feeder, and the lever is provided with a step having a step for holding the stage at a position away from the feeder, and is attached to the lever, An urging member for urging the lever in a direction to hold the stage in a direction away from the feeder, and an urging member provided coaxially with the feeder and abutting on the lever by rotating. A first cam portion for rotating the lever in a direction opposite to the direction in which the stage is pressed against the urging force, and formed integrally with the first cam portion, and held on the lever by rotating. A person who comes in contact with a stage that has not been set and leaves the stage from the feeder When a first cam portion rotates and presses the lever while the lever stage is holding the stage, a second cam portion is provided. When the lever stage is disengaged from the stage, the medium on the stage is pushed out by the feeder and fed out, and when the cam further rotates, the second cam portion moves the stage. The lever is rotated in a direction away from the feeder to a predetermined position. By maintaining the state, the feed roller rotates for feeding out the medium, and after feeding out one sheet of media, the stage is moved to the feeder.
The rotation of the drawer automatically returns from the position pressed by the feeder to the position before the medium feeding operation.
Therefore, the operation for returning the stage after the medium feeding operation to the position before the medium feeding operation of the feeder becomes unnecessary.
In this case, the next medium to be fed out is no longer fed out.

Further, by adjusting the shape of the lever and the cam for controlling the lever, it is possible to make the time for pressing the stage loaded with the medium against the feeder variable. Therefore, the medium loaded on the stage is fed
Can increase the repetitive output of thick paper by increasing the pressing force on the paper, and shorten the pressing time to prevent double feeding of thin paper. The width of the paper can be increased.

Also, a feeder for feeding out a medium,
A stage on which a medium is loaded and which is urged in a direction of pressing against the feeder, and a stage which is pressed against the feeder and rotates in a direction away from the feeder. As a result, a separation frame which is pressed by the stage and rotates in a direction away from the feeder, and is provided rotatably,
When the stage is engaged, the first stage presses the stage in the separating frame direction and holds the stage at a position away from the feeder. A second stage for pressing the stage further in the direction of the separation frame than the first stage and rotating and holding the separation frame in a direction away from the feeder. And the direction attached to the lever to press and hold the stage in the direction of the separating frame. When the first stage and the stage are disengaged from each other, the second stage and the stage are disengaged. A biasing member for biasing the lever in a direction in which the lever engages with the stage, and the stage rotates in the direction of the separating frame while the first stage holds the stage. When the first stage is disengaged from the stage, the second stage presses the stage, which presses the separation frame to separate the stage from the feeder. - By maintaining this state releases the arm, when taking out the generated paper jam, Fi -
Since the drawer and the separation friction material can be separated from each other, the paper can be easily taken out.

Further, since it is possible to maintain a state where the feeder and the separation frame are separated from each other, if the feeder mechanism is not used, the separation to the feeder for a long period of time is possible. Separated frames generated by oil seeping out of the feeder by keeping the frames pressed against each other
The deformation, expansion, and deformation of the separation friction material provided on the contact surface of the drum with the feed roller can be prevented, and the separation friction material caused by the deformation of the feed roller and separation friction material caused by pressure welding can be prevented. Paper feeding failure can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a sheet feeding mechanism according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a relationship between a lever and a sheet feeding stage in the embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a relationship between a lever and a paper feed stage in the embodiment of the present invention.

FIG. 4 is an explanatory diagram of an operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram of an operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram of an operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 7 is an explanatory diagram of an operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 8 is a perspective view showing a separation frame according to the embodiment of the present invention.

FIG. 9 is a plan view showing a separation frame according to the embodiment of the present invention.

FIG. 10 is an enlarged view showing a resist film according to an embodiment of the present invention.

FIG. 11 is an explanatory diagram of an operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 12 is a diagram illustrating the operation of the paper feed mechanism according to the embodiment of the present invention.

FIG. 13 is an explanatory diagram of an operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 14 is a diagram illustrating the operation of the paper feed mechanism according to the embodiment of the present invention.

FIG. 15 is an explanatory diagram illustrating the operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 16 is an explanatory diagram of an operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 17 is an explanatory diagram of an operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 18 is an explanatory diagram illustrating the operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 19 is an explanatory diagram illustrating the operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 20 is an explanatory diagram illustrating the operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 21 is an explanatory diagram of an operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 22 is an explanatory diagram illustrating an operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 23 is an explanatory diagram illustrating the operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 24 is an explanatory diagram of an operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 25 is an explanatory diagram of an operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 26 is an explanatory diagram of an operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 27 is an explanatory diagram illustrating the operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 28 is an explanatory diagram of an operation of the sheet feeding mechanism according to the embodiment of the present invention.

FIG. 29 is a perspective view showing a conventional paper feed mechanism.

FIG. 30 is a diagram illustrating the operation of a conventional paper feed mechanism.

FIG. 31 is a diagram illustrating the operation of a conventional paper feed mechanism.

FIG. 32 is a diagram illustrating the operation of a conventional paper feed mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper feed mechanism 23 Pressure roller 24 Register roller 31 Feed roller 32 Paper feed stage control cam 32a First cam portion 32b Second cam portion 35 Paper feed stage 35b Convex portion 38 Lever -38b First stage 38c Second stage 41 Separation frame 42 Separation friction material 44a Arm 46 Tray 47 Stay 52 Paper

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI B65H 3/46 B65H 3/46 C 3/52 310 3/52 310B 5/36 5/36

Claims (6)

(57) [Claims] A feeder for feeding the medium; a stage loaded with the medium and biased in a direction of pressing against the feeder; a stage rotatably provided; When the lever is engaged with the lever, the lever is provided with a step which presses the stage in a direction away from the feeder and holds the stage at a position away from the feeder. An urging member for urging the lever in a direction to press and hold the stage in a direction away from the feeder, and a pressing member provided coaxially with the feeder and rotating to contact the lever. A first cam portion for rotating the lever in a direction opposite to the direction of pressing the stage against the urging force by contacting the lever;
The second cam, which is formed integrally with the first cam portion, rotates to abut on a stage that is not held by the lever to rotate the stage away from the feeder. A first cam rotates and presses the lever in a state where the lever stage holds the stage.
When the cam disengages from the stage and the medium on the stage is pressed by the feeder and the cam is further rotated, the second cam portion moves the stage to the predetermined position. The lever is rotated in the direction away from the roller, the lever is rotated by the urging force, and the lever step presses the stage, releases the stage from the feeder, and maintains that state. And paper feed mechanism. 2. A feeder for feeding out a medium, a stage loaded with a medium and biased in a direction of pressing against the feeder, a stage being pressed against the feeder, A separation frame, which is pressed by the stage when the roller rotates away from the feeder and rotates in a direction away from the feeder; A first step for pressing the stage in the direction of the separation frame when engaged with the stage and holding the stage in a position away from the feeder; A second stage for pressing the stage further in the direction of the separation frame than the first stage to rotate and hold the separation frame in a direction away from the feeder.
And a direction in which the stage is pressed and held in the separating frame direction when the first stage and the stage are disengaged from each other. And a biasing member for biasing the lever in a direction in which the lever engages with the lever, wherein the stage rotates in the separation frame direction while the first stage holds the stage, When the first stage disengages from the stage, the second stage presses on the stage and the stage
A sheet feeding mechanism characterized in that a separation frame is pressed by a jaw to release the separation frame from the feeder and to maintain the state. 3. A feeder for feeding out a medium, a stage on which the medium is loaded and which is urged in a direction of pressing against the feeder, a stage which is pressed against the feeder, A separation frame, which is pressed by the stage when the roller rotates away from the feeder and rotates in a direction away from the feeder; A first step for pressing the stage in the direction of the separation frame when engaged with the stage and holding the stage in a position away from the feeder; A second stage for pressing the stage further in the direction of the separation frame than the first stage, and rotating and holding the separation frame in a direction away from the feeder.
And a direction in which the stage is pressed and held in the separating frame direction when the first stage and the stage are disengaged from each other. A biasing member for biasing the lever in a direction in which the lever engages with the tray; a tray rotatably provided continuously upstream of the stage in the medium transport direction, on which the medium is stacked together with the stage; Is attached to the tray, and the other end presses the lever by rotating the tray in the non-use state direction. The first stage holds the stage, and By the rotation, the stay rotates the lever, and the first step and the stay are rotated.
When disengaged from the stage, the second stage presses the stage,
A sheet feeding mechanism wherein the stage presses the separation frame to release the separation frame from the feeder and keeps the state. 4. A feeder for feeding out a medium, a stage on which the medium is loaded and urged in a direction of pressing against the feeder, a stage being pressed against the feeder, A separation frame, which is pressed by the stage when the roller rotates away from the feeder and rotates in a direction away from the feeder; A first step for pressing the stage in the direction of the separation frame when engaged with the stage and holding the stage in a position away from the feeder; A second stage for pressing the stage further in the direction of the separation frame than the first stage, and rotating and holding the separation frame in a direction away from the feeder.
And a direction in which the stage is pressed and held in the separating frame direction when the first stage and the stage are disengaged from each other. A biasing member for biasing the lever in a direction in which the lever engages with the lever, and a biasing member provided coaxially with the feeder and rotating to abut against the lever to rotate the lever against the biasing force. A first cam portion that rotates in a direction opposite to the direction in which the jaws are pressed;
The second cam, which is formed integrally with the first cam portion, rotates to abut on a stage that is not held by the lever to rotate the stage away from the feeder. A cam configured with a cam portion, a tray rotatably provided continuously upstream of the stage in the medium transport direction, and a tray on which the medium is stacked together with the stage; and one end attached to the tray. A state is provided in which the other end presses the lever from the direction opposite to the pressing direction of the first cam by rotating in the non-use state direction, and the first step holds the stage. Then, when the stay presses the lever from the direction opposite to the pressing direction of the first cam by the rotation of the tray, the engagement with the stage shifts from the first stage to the second stage, and the separation frame is released. -Move the stage away from the feeder while the second stage holds the stage In a state where there, the first cam lever rotates - When pressed, stearyl -
The engagement with the stage shifts from the second stage to the first stage, and when the rotation of the first cam further advances, the engagement between the first stage and the stage is released, and the stage is disengaged. When the medium is pressed and fed by the feeder and the cam is further rotated, the second cam portion rotates the stage to a predetermined position in a direction away from the feeder, and the lever is attached. A sheet feeding mechanism characterized in that the stage is rotated by the force and the first stage presses the stage to release the stage from the feeder and maintain the state. 5. A resist roller provided downstream of the feed roller in the medium transport direction, the surface of which is covered with a rubber material, to which a driving force is applied, and a pressure roller pressed against the resist roller. A pair of rollers for correcting the skew of the medium and conveying the medium downstream in the conveyance direction, and between the feed roller and the pair of rollers, which are parallel to the medium conveyance direction. One end is attached to the paper feed guide provided in pairs in the appropriate direction, and the paper feed guide on the registration roller side.
5. The sheet feeding device according to claim 4, wherein the other end is in contact with a pressure roller side sheet feeding guide, the medium is sandwiched between the pressure roller side sheet feeding guide, and an elastic film for correcting the medium waving. mechanism. 6. The separation frame includes a separation friction material on a contact surface with the feed roller, and a separation guide formed of an elastic member upstream of the separation friction material in the medium transport direction. 6. The paper feed mechanism according to claim 5, wherein elastic arms are formed at both ends in the width direction of the separation guide so as to contact the paper feed guide on the side of the registration roller.