JPH05119665A - Paper handling device - Google Patents

Abstract

PURPOSE:To obviate the generation of a gear jump accident during a copying operation by providing a part for accumulating a lubricant when a gear is engaged in at least either of a gear releasing cam body or the engaging part of a cam part. CONSTITUTION:This device has a 1st roller 1 and a 2nd roller 2, a roller driving gear, a knob shaft, intermediate gear, a roller gear, and the gear releasing cam body 26. The cam part with which the gear releasing cam body 26 engages is provided on the intermediate gear. This cam part moves the intermediate gear in the direction of disengaging this gear from the roller driving gear by swiveling of the gear releasing cam body 26 when the knob shaft is rotated. The part 30 for accumulating the lubricant when the gear is engaged is provided in at least either of the gear releasing cam body 26 and the engaging part of the cam part. As a result, the excess lubricant and foreign matter are expelled into the part 30 for accumulating the lubricant. The floating of the gear releasing cam body 26 by the lubricant accumulated in the cam part of the intermediate gear and the jumping of the gear are thus prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet processing apparatus used in a fixing device of an image forming apparatus such as a copying machine, a printer or a facsimile, or a sheet conveying device.

[0002]

2. Description of the Related Art A conventional sheet processing apparatus of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. 1-303264 when it is applied to a fixing apparatus. This will be described with reference to FIG. Here, FIGS. 8A, 8B, and 8C show the structure of the gear release cam body of the conventional sheet processing apparatus, FIG. 8A is a front view, and FIG. 8B is A- of FIG. A sectional view, and (c) is a sectional view taken along line BB in (a), and FIGS. 9A, 9B, and 9C show a configuration of an intermediate gear of a conventional sheet processing apparatus,
10A is a front view, FIG. 10B is a sectional view taken along line CC of FIG. 10A, and FIG. 10C is a sectional view taken along line DD of FIG. FIG. 11 is an explanatory diagram showing the configuration of a fixing device to which the sheet processing device is applied.

As shown in FIG. 11, a fixing device 100 to which a conventional sheet processing device is applied is unitized,
When the fixing device 100 is provided in, for example, an electrophotographic copying machine, a transfer sheet S on which an unfixed toner image is formed is fed to the fixing device 100 in the direction of arrow A.

A pressure roller (second roller) 2 is in contact with the fixing roller (first roller) 1 at a predetermined pressure, and a transfer sheet S is passed between the fixing roller 1 and the pressure roller 2. The unfixed toner image on the transfer sheet S is fixed by the heat from the heat source 3 inside the fixing roller 1 and the pressure. After this fixing, the transfer sheet S is separated from the peripheral surface of the fixing roller 1 by the separating claw 4, and is discharged from the space between the discharge rollers 5a and 5b to the outside of the fixing device. The fixing roller 1 has an oil coating felt 6
The oil for preventing offset from the oil tray 7 is applied to the peripheral surface of the fixing roller 1 through the oil application felt 6. 6a is a blade for uniformly adhering the oil to the peripheral surface of the fixing roller 1.

In FIG. 10, the axis indicated by reference numeral 18 is
The sprocket 9 is fixed, and a fixing roller drive gear 11 is attached via a one-way clutch 10, and these are provided on the body side of the copying machine.

The knob shaft 2 is provided on the side plates 20 and 21 on the fixing device side.
2 is rotatably supported via bearings 23 and 24. One end of the knob shaft 22 thereof is rotated when a jam occurs on the transfer sheet S between the fixing roller 1 and the pressure roller 2. A knob 25 that is operated dynamically is attached. Also, the knob shaft 2
On the other end side of 2, an intermediate gear 12 is attached so as to be movable in its axial direction and rotatable. The intermediate gear 12 meshes with the fixing roller drive gear 11. A fixing roller gear 13 is provided on the axis of the fixing roller 1,
The fixing roller gear 13 meshes with the intermediate gear 12.

At the time of fixing, a motor (not shown) on the main body side of a copying machine or the like rotates, and a chain (not shown) rotates with this rotation so that the sprocket 9 is rotated. There is. When the sprocket 9 rotates clockwise, the shaft 18 also rotates in the same direction, and at this time, the fixing roller drive gear 11 rotates integrally with the shaft 18 via the one-way clutch 10. The one-way clutch 10 uses the fixing roller drive gear 11 only when the shaft 18 rotates clockwise.
It is mounted on the shaft 18 so as to transmit the rotational driving force to the shaft.

When the fixing roller drive gear 11 rotates clockwise, the intermediate gear 12 rotates counterclockwise, and the fixing roller gear 13 rotates clockwise accordingly. That is, the fixing roller 1 rotates in the arrow direction in FIG. During such driving, the intermediate gear 12
The gear release cam body 26, which will be described later, rotates together with the gear release cam body 26. At this time, the knob shaft 22 also rotates together.

As described above, at the time of fixing, when the sprocket 9 rotates, the fixing roller 1, the oil supply cam (not shown), the paper discharge roller gear, etc. are rotationally driven.

Here, in FIG. 11, the transfer sheet S may be jammed between the fixing roller 1 and the pressure roller 2. When such a jam occurs, the operation of the sprocket 9 described above stops and the fixing roller 1 and the like stop, and in this state, the transfer sheet S has to be extracted and removed from between the rollers 1 and 2. is there. However, if the transfer paper S sandwiched between the rollers 1 and 2 is pulled out as it is, a predetermined pressure is applied between the rollers 1 and 2, so that the transfer paper S is broken. To relax. Therefore, the knob 25 shown in FIG. 10 is rotated to rotate the fixing roller 1 and the pressure roller 2 so that the transfer sheet S is moved in the B or C direction (see FIG.
Although the knob 25 may be configured to be discharged to 1), such rotation of the knob 25 is performed against the load of the drive system, and the rotation operation becomes heavy, and it is impossible. When turned to, the chain may come off the sprocket 9.
Alternatively, the knob 25 may be rotated by pulling the knob 25 toward the front side and disengaging the intermediate gear 12 from the fixing roller driving gear 11, but in this case, the operation of pulling the knob 25 is performed. Is required and the work becomes troublesome.

In order to solve this, as shown in FIGS. 8 (a) and 8 (b), the center hole 26 of the gear release cam body 26 is formed.
The knob shaft 22 is passed through e, and at this time, the pin 14 (FIG. 10) fixed to the knob shaft 22 is fitted into the slits 26c, 26c of the gear release cam body 26. Thus, the gear release cam body 26 is integrally provided on the end side of the knob shaft 22 opposite to the side on which the knob 25 is provided. A cam portion is formed on the gear releasing cam body 26.

That is, the gear release cam body 26 has an angle θ.
Having inclined flat surfaces 26a, 26a forming a flat portion 26b at the apex and projections 26d, 2 at both ends of the peripheral surface.
6d is provided.

On the other hand, the intermediate gear 12 is shown in FIG.
As shown in (b) and (c), a cam portion composed of inclined planes 12a and 12a forming an angle θ is formed in the hollowed-out portion inside. In addition,
The angle θ is set to about 80 ° to 120 °, and about 100 ° is preferable. A bottom flat portion 12b is provided at a place where both the inclined planes 12a fall, and engaging projections 12d and 12d are provided so as to face each other on the hollowed inner peripheral portion.

The center shaft 12e of the intermediate gear 12 shown in FIG. 9 is passed through the knob shaft 22 shown in FIG.
It is put in the slit 26c of the gear release cam body 26 on the shaft end side of 2. Then, after the shaft end side is completely inserted into the center hole 26e of the gear release cam body 26, as shown in FIG.
Stop with ring 45.

In the state shown in FIG. 10, the inclined flat surface 12a of the intermediate gear 12 is acted on by the extension elastic force of the compression spring 15.
(FIG. 9) and the inclined flat surface 26a (FIG. 8) of the gear release cam body 26 are in a state of being pressed and engaged with each other.

Under the conditions described above, when a transfer sheet is fed in the B direction (FIG. 11) when a jam occurs, the knob shaft 2 is used.
Turn the knob 25 (FIG. 10) provided on the shaft end of 2 in the counterclockwise direction.

At this time, the intermediate gear 12 integrated with the gear releasing cam body 26 tries to rotate the fixing roller driving gear (first roller driving gear) 11 in the clockwise direction. However, since the fixing roller drive gear 11 is loaded on the main body side, it does not rotate, and only causes the intermediate gear 12 to generate a clockwise rotational moment as a reaction.

When the knob shaft 22 is rotated in a state where such a moment is generated, the flat portion 26b (FIG. 8) of the gear release cam body 26 which rotates integrally with the knob shaft 22 is provided with both inclined planes 12a (FIG. 8) of the intermediate gear 12. 9) so that the intermediate gear 12 is gradually moved by the pressing force of the spring 15 in the direction of the arrow by pushing the same surface, and the intermediate gear 12 is disengaged from the fixing roller drive gear 11.

With the intermediate gear 12 separated from the fixing roller drive gear 11, the boss portion 12f of the intermediate gear 12 contacts the spring seat 46, and at this time, in this example, the protrusion 26d of the gear release cam body 26 (see FIG. 8). ) Is the engagement protrusion 12d of the intermediate gear 12.
(FIG. 9).

At this stage, the gear release cam body 26 and the intermediate gear 12 rotate integrally with each other. Along with this, the intermediate roller 12 rotates the fixing roller gear 13 and the fixing roller 1 rotates clockwise. The transfer paper moves to move in the direction of arrow B (Fig. 1
It is sent to 1) and discharged.

Also in this example, since the intermediate gear 12 is disengaged from the fixing roller drive gear 11, the knob can be rotated with a light force.

When the transfer paper is sent out in the direction of arrow C (FIG. 11), the knob shaft 22 of FIG. 11 may be rotated clockwise. In this case, how to disengage the intermediate gear 12 is as follows. It is done in exactly the same way. This is because the inclined planes and the protrusions of the gear release cam body 26 and the intermediate gear 12 are formed symmetrically.

In any case, no matter whether the knob is turned clockwise or counterclockwise, the gear release cam body 26 pivots and the intermediate gear 12 disengages from the fixing roller drive gear 11 and disengages from it. After that, the gear release cam body 26 and the intermediate gear 12 are integrally rotated.

Even if the knob shaft 22 is pulled toward you, the intermediate gear 1
2 can be removed from the fixing roller drive gear 11.

By the way, when the flat portion 26b (FIG. 8) of the gear releasing cam body 26 is rotated, the flat portion 26b at the corner portion slides in a state of point contact with the inclined flat surface 12a (FIG. 9). Since it moves, it is desirable to use a wear resistant material for the gear release cam body or the flat portion 26b.

For example, it is convenient to use a material obtained by quenching steel or an iron-based sintered material, or a ceramic agent. Further, it is desirable that the mating inclined plane 12a (FIG. 9) is also made of a material similar to that, and it is still effective to use a lubricant or the like.

In FIG. 11, the knob shaft 22 is rotated to disengage the intermediate gear 12 from the fixing roller drive gear 11,
Further, after the jammed paper is removed by integrally rotating the intermediate gear 12 and the gear release cam body 26, the knob 25 (FIG. 11)
When the hand is released from the knob shaft 22, the flatness 26b (FIG. 8) is riding on the inclined flat surface 12a (FIG. 9), and the knob shaft 22 is provided with a turning habit in a direction opposite to the direction in which it has been turned so far. The knob shaft 22 returns to the original rotation position while being rotated in that direction. At this time, the intermediate gear 12 has the spring 15
11 and is meshed with the fixing roller drive gear 11,
Return to the position.

In this case, even if the meshing position of the intermediate gear 12 and the fixing roller driving gear 11 is bad and the intermediate gear 12 is stopped at the tooth end, the compression spring 15 is started after the main body is started.
The intermediate gear 12 smoothly meshes with the fixing roller drive gear 11 while being pushed by. The same applies when the fixing device 100 is set in the main body of the copying machine.

[0029]

By the way, in the above-mentioned conventional sheet processing apparatus, the intermediate gear 12 and the gear release cam member 26 are provided.
By providing the cam portion that engages with, the jammed paper can be easily removed by a simple operation without the need to pull the knob 25.

However, since the fixing device to which this paper processing apparatus is applied is of a heat press type, the intermediate gear 12 and the gear release cam body 26 are formed of a heat resistant metallic material. Therefore, in order to increase the sliding ability of the cam portion, it is necessary to apply a lubricant such as grease to the cam portion. However, when a large amount of grease is applied in the shape of a general cam portion, the applied grease gradually accumulates at the bottom of the cam portion formed on the intermediate gear 12, which causes a problem that the gear release cam body 26 rises. .. In particular, the floating state becomes remarkable when the scattered toner is mixed in with time or when the lubricant is deteriorated. As described above, when the floating occurs, the releasing force of the cam portion is weakened, and the gear may be disengaged during the operation of the copying machine, which may cause a gear jump.

On the other hand, when a large amount of grease is applied in the shape of a general cam portion, the grease is expelled from the cam surface over time, and the sliding portion of the gear release cam body 26 is scraped. Occurs. This also weakens the initial release force of the cam portion, which causes gear jump.

Further, in the general shape of the cam portion, during high speed rotation and high output, the rotational force of the intermediate gear 12 is dispersed in the thrust direction along the cam surface, and the intermediate gear 12 moves in the thrust direction. As a result, there arises a problem that a gear jump that does not transmit the drive occurs.

Further, in the conventional paper processing apparatus, since the sliding portion of the cam portion formed on the intermediate gear 12 has a point contact structure, the intermediate gear 12 is released by a paper jam or the like. The sliding portion of the cam portion may be abraded over time, the movement amount (release amount) of the intermediate gear 12 may be reduced, and the intermediate gear 12 may not be released.

Further, in the conventional sheet processing apparatus, a helical gear is often used as the intermediate gear 12 for quiet design, and the helical gear that applies a thrust force in the direction in which the intermediate gear 12 bites by the rotation of the drive gear 11 is used. Is used. In this case, when the knob shaft 22 is rotated in the roller driving direction to remove the jammed paper, a thrust force is applied in the gear biting direction and a large releasing force is required.

A first object of the present invention is to provide a sheet processing apparatus which prevents the gear releasing cam body from being lifted and prevents a gear jump accident during a copying operation.

A second object of the present invention is to provide a sheet processing apparatus in which an appropriate amount of lubricating oil is always supplied to the cam portion.

A third object of the present invention is to provide a sheet processing apparatus which can increase the initial pressure when the intermediate gear moves and can cope with high speed rotation and high load.

A fourth object of the present invention is to provide a sheet processing apparatus capable of smoothly removing jammed paper.

[0039]

In order to achieve the first object, the invention according to claim 1 has a first roller and a second roller for conveying the sheet through the sheet, and A roller drive gear for rotationally driving the first roller, and a knob shaft provided with a knob that is rotated when a jam occurs in the sheet between the first roller and the second roller. , This knob shaft is movable in its axial direction, and
An intermediate gear that is rotatably provided and meshes with the roller drive gear, a roller gear that is provided on the shaft of the first roller and that rotates by meshing with the intermediate gear, and a gear release cam body provided on the knob shaft. , The intermediate gear is provided with a cam portion with which the release cam body is engaged, and when the knob shaft is rotated, the cam portion is rotated by the gear release cam body,
The intermediate gear is moved in a direction to be disengaged from the roller drive gear, and at least one of the gear releasing cam body and the engaging portion of the cam portion is provided with a lubricant reservoir portion when engaged. ..

In order to achieve the second object, in the invention according to the second aspect, the first roller and the second roller for conveying the sheet through the sheet are rotated, and the first roller is rotated. A knob shaft provided with a knob that is rotated when a jam occurs in the sheet between the roller drive gear for driving and the first roller and the second roller, and the knob shaft Provided to be movable in the axial direction and rotatable
An intermediate gear that meshes with the roller drive gear, a roller gear that is provided on the shaft of the first roller and that rotates by meshing with the intermediate gear, and a gear release cam body provided on the knob shaft are provided. A cam portion with which the release cam body is engaged is provided, and when the knob shaft is rotated,
By rotating the gear release cam body, the intermediate gear is moved in a direction to be disengaged from the roller drive gear, and the cam portion is lubricated to a position facing the sliding portion of the gear release cam when engaged. It is configured to have an agent supply section.

In order to achieve the third object, in the invention according to the third aspect, the first roller and the second roller for conveying the sheet through the sheet are rotated, and the first roller is rotated. A knob shaft provided with a knob that is rotated when a jam occurs in the sheet between the roller drive gear for driving and the first roller and the second roller, and the knob shaft Provided to be movable in the axial direction and rotatable
An intermediate gear that meshes with the roller drive gear, a roller gear that is provided on the shaft of the first roller and that rotates by meshing with the intermediate gear, and a gear release cam body provided on the knob shaft are provided. A cam portion with which the release cam body is engaged is provided, and when the knob shaft is rotated,
By rotating the gear release cam body, the intermediate gear is moved in a direction to be disengaged from the roller drive gear, and the initial pressure when the intermediate gear moves is applied to the gear release cam body or the engaging portion of the cam portion. The configuration is such that a click portion for raising the height is provided.

In order to achieve the fourth object, the invention according to claim 4 rotates a first roller and a second roller for conveying the sheet through a sheet between the first roller and the second roller. A knob shaft provided with a knob that is rotated when a jam occurs in the sheet between the roller drive gear for driving and the first roller and the second roller, and the knob shaft An intermediate gear that is movable in the axial direction and is rotatable and that meshes with the roller drive gear; a roller gear that is provided on the shaft of the first roller and that rotates by meshing with the intermediate gear; and a knob shaft. A gear releasing cam body provided, and the intermediate gear is provided with a cam portion with which the releasing cam body engages. When the knob shaft is rotated, the cam portion is formed by turning the gear releasing cam body. , Whether the intermediate gear is the roller drive gear A one-way clutch that moves the roller drive gear in the disengaging direction and transmits the drive of the power source only in the sheet passing direction of the paper is provided in the tooth portion of the intermediate gear. When the roller is rotated in the direction opposite to the sheet passing direction, the intermediate gear has a helical shape in a direction to escape from the drive gear.

[0043]

According to the first aspect of the present invention, excess lubricant or foreign matter is contained in the lubricant reservoir when engaged, which is formed on at least one of the gear release cam body and the cam portion formed on the intermediate gear. Goes in. For this reason, when scattered toner is mixed in the lubricating oil with time or the lubricating oil deteriorates, all of this lubricating oil accumulates at the bottom of the cam portion of the intermediate gear along with the paper processing operation, It is possible to prevent a gear jump that the release cam body floats and the gear comes off during operation.

According to the second aspect of the present invention, since the lubricant supply portion is provided at a position facing the gear release cam body of the intermediate gear when the gear release cam body is engaged, the lubricant is supplied each time the gear release cam body is engaged. The lubricant is supplied from the supply part to the sliding part. Therefore, it is possible to prevent the lubricant from being expelled from the cam surface over time and the sliding portion of the gear release cam body being scraped as in the conventional case.

According to the third aspect of the present invention, since the click portion is provided in the cam portion of the intermediate gear or the engaging portion of the gear release cam body, the initial pressure during movement of the intermediate gear becomes high, and the intermediate gear moves. Gear skipping due to movement in the thrust direction does not occur, and high speed rotation and high load operation can be supported.

According to the fourth aspect of the present invention, when the knob shaft is rotated in the roller driving direction, the one-way clutch smoothly rotates, and the knob shaft is rotated in the opposite direction to the roller driving direction. Since the thrust force of the helical gear used as the intermediate gear allows the smooth release, the jam handling is easy and the operation is comfortable.

[0047]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 7 in which the same parts as those in FIGS. Here, FIG. 1 shows the first of the present invention.
2 is a front view, (b) is a sectional view taken along line EE of (a), (c) is a sectional view taken along line FF of (a), and FIG. Shows the structure of the intermediate gear of the second embodiment of the present invention, (a) is a front view, (b) is a G- of (a).
G sectional view, (c) H-H sectional view of (a), FIG. 3 is an explanatory view showing the configuration of the main part of the third embodiment of the present invention, and FIG. 4 is the fourth embodiment of the present invention. Shows the configuration of the gear release cam on
(A) is a front view, (b) is a sectional view taken along the line I-I of (a),
5C is a sectional view taken along line JJ in FIG. 5A, FIG. 5 shows a configuration of an intermediate gear according to a fourth embodiment of the present invention, and FIG.
(B) is a cross-sectional view taken along the line KK of (a), and (c) is an L- line of (a).
L sectional view, FIG. 6 is a characteristic diagram between the intermediate gear movement amount and the knob shaft rotation angle of the fifth embodiment of the present invention, and FIG. 7 is an explanatory diagram showing the configuration of the main part of the sixth embodiment of the present invention. is there.

As shown in FIG. 1, in the first embodiment, on the end surface of the gear release cam body 26. A reservoir 30 for a lubricant such as grease for engagement is provided at peripheral positions of the center hole 26e facing each other. Therefore, when the scattered toner is mixed in the lubricant with time or the lubricant is deteriorated, the excess lubricant and foreign matters are driven into the reservoir 30, so that all of the lubricant is gradually removed from the intermediate gear 12. The gear release cam 26 is prevented from rising by accumulating at the bottom of the cam portion. For this reason, the releasing force of the cam portion of the intermediate gear 12 is weakened, and the gear is prevented from being disengaged during the paper processing to be in the gear jump state.

Further, in the first embodiment, the cam portion of the intermediate gear 12 is designed to withstand a high torque, and although not shown, a high load is applied to the cam portion by a spring so that a gear jump does not occur. I am doing it. Other configurations, operations and effects of the first embodiment are the same as those of the conventional sheet processing apparatus described above.

In the second embodiment, as shown in FIG. 2, the center hole 12e is sandwiched in the intermediate gear 12 and the lubricant is provided at a position facing the sliding portion of the gear release cam 26 when the cam portion is engaged. The supply part 32 is provided, and the lubricant reservoir 31 is formed between the lubricant supply parts 32 so as to surround the center hole 12e.
Is provided. In the second embodiment, the gear release cam 2
Each time 6 is engaged, a lubricant is supplied from the lubricant supply part 32 to the sliding part, and an appropriate amount of lubricant is constantly supplied to the cam surface,
The sliding portion of the gear release cam 26 is prevented from being scraped. For this reason, in the second embodiment, the initial release force does not become weak and gear skipping does not occur. Other configurations, operations and effects of the second embodiment are the same as those of the first embodiment already described.

FIG. 3A is a sectional view of the gear release cam body of the third embodiment, and FIG. 3B is a sectional view of the intermediate gear. As shown in FIG. 3, in the third embodiment, the intermediate gear is used. The click portion 36 is provided on the cam portion 12 or the click portion 36 is provided on the engaging portion of the gear release cam 26. By doing so, in the third embodiment, it is possible to increase the initial pressure when the intermediate gear 12 moves, and it is possible to withstand high speed rotation and high load. Other configurations, operations and effects of the third embodiment are the same as those of the first embodiment already described.

In the fourth embodiment, the structure is such that the initial variation amount when the intermediate gear 12 moves is large, the initial pressure when the intermediate gear 12 moves can be increased, and the gear disengagement can be prevented. be able to. A characteristic as shown by a curve C1 in FIG. 6 is recognized between the knob shaft rotation angle and the intermediate gear movement amount in the fourth embodiment. The straight line D1 in FIG. 6 is a characteristic straight line of the conventional sheet processing apparatus. Other configurations, operations and effects of the fourth embodiment are the same as those of the first embodiment already described.

In the fifth embodiment, as shown in FIGS. 4 and 5, the gear release cam body 26 and the cam portion of the intermediate gear 12 are
It has a structure of surface contact or line contact. In the case of surface contact, the intermediate gear movement diagram is as shown in FIG.
Then, as in the case of the conventional sheet processing apparatus, a straight line D1 is formed, but when the lines are brought into contact with each other, the initial pressure can be increased as a characteristic like a curve C1 in FIG.

The sixth embodiment has a structure as shown in FIG. 7, and in order to be applied to a fixing device, the first roller 1 and the second roller 2 are under pressure, The drive torque is high. A helical gear is used as the intermediate gear 12 because of its quiet design. However, when a helical gear is used, the operation torque is different between left-handed and right-handed rotation of the knob shaft 22 due to the twist angle of the gear, and thrust force is applied in the direction in which the intermediate gear 12 and the roller drive gear 11 escape. When the knob shaft 22 is rotated, the driving torque is further increased and the operability may be poor.

Therefore, in the sixth embodiment, the drive of the power source is transmitted to the roller drive gear 11 only in the sheet passing direction.
When the one-way clutch 10 is provided and the knob shaft 22 is further rotated in the reverse direction of paper feeding, the intermediate gear 12 is used in consideration of the direction of the hasha so that the thrust force acts in the direction in which the intermediate gear 12 escapes from the roller drive gear 11. is doing. FIG. 7 shows a gear release mechanism of the sixth embodiment. When the power source rotates to the right as shown by the arrow, the first roller 1 moves through the drive shaft 41, the roller drive gear 11, and the intermediate gear 12. The sheet is rotated clockwise, the second roller 2 is rotated together, and the sheet is transported from right to left in the figure.

When a jam occurs and the paper is sandwiched between the first roller 1 and the second roller 2, the knob shaft 22 is rotated counterclockwise, the first roller 1 is rotated clockwise, and the paper is not rotated. Jam can be released by feeding in the paper feeding direction (right to left). At this time, the drive gear 11 is also driven to rotate to the right, but the one-way clutch 10 does not rotate the drive shaft 41. Therefore, a torque exceeding the rotational torque of the first roller 1 and the second roller 2 is applied to the knob shaft 22. In addition, it is possible to easily perform jam processing. Similarly, when the knob shaft 22 is rotated to the right, the first roller 1 is rotated to the left, so that the sheet is fed in the direction opposite to the sheet passing (from right to left). At this time, since the power source of the roller drive gear 11 is stopped, the roller drive gear 11 is stopped via the drive shaft 41 and the one-way clutch 10. For this purpose, the intermediate gear 12
The cam moves forward by the cam and the connection with the roller drive gear 11 is released. However, since the direction of the intermediate gear 12 has a direction to escape from the roller drive gear 11, the jam can be easily removed.

[0057]

According to the first aspect of the present invention, excess lubricant or foreign matter is driven into the lubricant reservoir, and the gear release cam body floats up due to the lubricant oil accumulated in the cam of the intermediate gear.
It is possible to prevent a gear jump.

According to the second aspect of the present invention, the lubricating oil supply portion of the cam portion of the intermediate gear can drive the lubricating oil of the cam surface into the sliding portion, thereby reducing wear of the cam portion due to running out of lubricating oil. However, it is possible to prevent a decrease in the initial release force of the cam that causes a gear jump.

According to the third aspect of the present invention, the click portion provided on the cam portion of the intermediate gear or the engaging portion of the gear release cam body increases the initial pressure when the intermediate gear is moving (released), thereby causing the gear jump. It is possible to prevent the occurrence of the above, and to operate at high speed and withstand a high load operation sufficiently.

According to the fourth aspect of the present invention, the knob shaft can be smoothly rotated to improve the operability when removing the jammed paper.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a gear release cam body according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of an intermediate gear according to a second embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a configuration of a main part of a third embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a configuration of a gear release cam body according to a fourth embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a configuration of an intermediate gear according to a fourth embodiment of the present invention.

FIG. 6 is a characteristic diagram between an intermediate gear movement amount and a knob shaft rotation angle according to a fifth embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a configuration of a main part of a sixth embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a configuration of a gear release cam body of a conventional sheet processing apparatus.

FIG. 9 is an explanatory diagram showing a configuration of an intermediate gear of a conventional sheet processing apparatus.

FIG. 10 is an explanatory diagram showing a configuration of a main part of a conventional sheet processing apparatus.

FIG. 11 is an explanatory diagram showing a configuration of a fixing device to which a sheet processing device is applied.

[Explanation of symbols]

 1 First Roller 2 Second Roller 10 One-Way Clutch 11 Roller Drive Gear 12 Intermediate Gear 12e Center Hole 13 First Roller Gear 22 Knob Shaft 26 Gear Release Cam Body 26e Center Hole 30,31 Reservoir 32 Lubricants 35, 36 Click part

Claims (4)

[Claims] 1. A first means for transporting a sheet through a sheet in between
When a jam occurs in the paper between the first roller and the second roller, the roller drive gear for rotating and driving the first roller, and the first roller and the second roller,
A knob shaft provided with a knob to be rotated, an intermediate gear that is provided on the knob shaft so as to be movable in the axial direction and rotatable, and meshes with the roller driving gear, and a shaft of the first roller. And a roller gear that meshes with the intermediate gear and rotates, and a gear release cam body provided on the knob shaft,
The intermediate gear is provided with a cam portion that engages with the release cam body, and when the knob shaft is rotated, the cam portion is rotated to move the intermediate gear from the roller drive gear. A sheet processing apparatus which is moved in a disengaging direction, and at least one of the gear releasing cam body and the engaging portion of the cam portion is provided with a lubricant reservoir when engaged. 2. A first means for transporting a sheet through a sheet between
When a jam occurs in the paper between the first roller and the second roller, the roller drive gear for rotating and driving the first roller, and the first roller and the second roller,
A knob shaft provided with a knob to be rotated, an intermediate gear that is provided on the knob shaft so as to be movable in the axial direction and rotatable, and meshes with the roller driving gear, and a shaft of the first roller. And a roller gear that meshes with the intermediate gear and rotates, and a gear release cam body provided on the knob shaft,
The intermediate gear is provided with a cam portion that engages with the release cam body, and when the knob shaft is rotated, the cam portion is rotated to move the intermediate gear from the roller drive gear. Move it in the removing direction,
A sheet processing apparatus, wherein a lubricant supply portion is provided at a position facing the sliding portion of the gear release cam during the engagement. 3. A first means for transporting the sheet through the sheet
When a jam occurs in the paper between the first roller and the second roller, the roller drive gear for rotating and driving the first roller, and the first roller and the second roller,
A knob shaft provided with a knob to be rotated, an intermediate gear that is provided on the knob shaft so as to be movable in the axial direction and rotatable, and meshes with the roller driving gear, and a shaft of the first roller. And a roller gear that meshes with the intermediate gear and rotates, and a gear release cam body provided on the knob shaft,
The intermediate gear is provided with a cam portion that engages with the release cam body, and when the knob shaft is rotated, the cam portion is rotated to move the intermediate gear from the roller drive gear. A sheet processing apparatus, comprising a click portion that is moved in a disengaging direction and that is provided at an engagement portion of the gear release cam body or the cam portion to increase an initial pressure when the intermediate gear moves. 4. A first means for transporting a sheet through a sheet in between.
When a jam occurs in the paper between the first roller and the second roller, the roller drive gear for rotating and driving the first roller, and the first roller and the second roller,
A knob shaft provided with a knob to be rotated, an intermediate gear that is provided on the knob shaft so as to be movable in the axial direction and rotatable, and meshes with the roller driving gear, and a shaft of the first roller. And a roller gear that meshes with the intermediate gear and rotates, and a gear release cam body provided on the knob shaft,
The intermediate gear is provided with a cam portion that engages with the release cam body, and when the knob shaft is rotated, the cam portion is rotated to move the intermediate gear from the roller drive gear. A one-way clutch that moves the roller drive gear in the disengaging direction and transmits the drive of the power source only in the sheet passing direction of the paper is provided in the tooth portion of the intermediate gear. A sheet processing apparatus, characterized in that when the roller is rotated in a direction opposite to the sheet passing direction, the intermediate gear is formed in a direction in which the intermediate gear escapes from the drive gear.