JP2657821B2 - Paper handling equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sheet processing device configured as a fixing device used in an image forming apparatus such as a copying machine, a printer, a facsimile, or a sheet conveying device, or the like.

2. Description of the Related Art A sheet processing apparatus for passing a sheet between a first roller and a second roller and conveying the sheet has been conventionally known. As an example, a paper such as a transfer paper is passed between a pair of rollers by pressing a pressure roller (second roller) against a fixing roller (first roller) having a predetermined heat source therein. 2. Description of the Related Art A fixing device that heats and fixes an upper unfixed image is known.

In this type of fixing device, a driving gear is meshed with a gear provided coaxially with the fixing roller, and the fixing roller is rotated by the driving force of the driving gear. The transfer paper may be jammed between the fixing roller and the pressure roller.

Conventionally, in order to cope with such a jam, a knob or the like is provided at the shaft end of the fixing roller, and the jammed paper is removed while rotating the fixing roller by rotating the fixing roller. The movement must be performed against the load of the transmission system such as the gear system, chain and sprocket described above.
If the rotation is forcibly performed, the chain may come off the sprocket.

Also, an intermediate gear is interposed between the driving gear and the fixing roller gear, and a knob is provided on the shaft of the intermediate gear. By pulling this knob, the intermediate gear is detached from the driving gear, and the knob is turned. There is also provided one in which the fixing roller is rotated through the intermediate gear and the fixing roller gear to remove the jammed paper, but in this example, the knob is pulled,
This operation has to be performed in two stages of turning, and this kind of operation is very troublesome.

What has been described above is not limited to the fixing device, but can be similarly applied to a sheet processing device such as a sheet conveying device having first and second rollers.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper processing apparatus capable of easily removing jammed paper with a simple operation without an operation of pulling a knob or the like.

Configuration In order to achieve the above object, the present invention has a first roller and a second roller for transporting a sheet between them, a first roller drive gear for rotating the first roller, and a first roller. A knob shaft on one end of which a knob for rotating when a paper jam occurs between the roller and the second roller is fixed to one end side; and the knob shaft is rotatable and moves in the axial direction. An intermediate gear that is freely provided and meshes with the first roller driving gear; and an intermediate gear that is coaxially integrated with the first roller and meshes with the intermediate gear and is driven by the first roller driving gear. A first roller gear rotated by a rotational driving force; and a gear release cam body integrally provided on the other end side of the knob shaft, wherein the first roller gear is pressed against both the intermediate gear and the gear release cam body. The cam parts that slide relative to each other. When the cam portion rotates the knob shaft, the cam portion moves the intermediate gear in a direction in which the intermediate gear is disengaged from the first roller drive gear, and after this movement, integrally rotates the gear release cam body and the intermediate gear. It is characterized in that it is configured as a cam portion that can be engaged.

In order to achieve the above object, the present invention has a first roller and a second roller for transporting a sheet between them, a first roller driving gear for rotating and driving the first roller, and a first roller. A knob shaft fixed to one end of a knob for rotating when a paper jam occurs between the first roller and the second roller; a knob shaft rotatably and movable in the axial direction. And an intermediate gear that meshes with the first roller drive gear; and a coaxially integrated part of the first roller that meshes with the intermediate gear and rotates the first roller drive gear via the intermediate gear. A first roller gear rotated by a driving force, and a gear release cam body integrally provided on the other end side of the knob shaft, wherein a cam portion with which the gear release cam body engages with the intermediate gear is provided. The cam part is attached to the knob shaft. When the gear release cam body is moved, the cam unit is configured to move the intermediate gear in a direction in which the intermediate gear is disengaged from the first roller drive gear by turning of the gear release cam body. An engagement portion for locking a gear release cam body for integrally rotating the intermediate gear is provided on the gear release cam body and the intermediate gear side.

Hereinafter, an embodiment in which the sheet processing apparatus according to the present invention is configured as a fixing device will be described.

FIG. 1 shows a fixing device according to an embodiment of the present invention. The fixing device 100 is a unit.

When such a fixing device 100 is provided in, for example, an electrophotographic copying machine, the fixing device has
The transfer paper S on which the unfixed toner image is formed is inserted in the direction of arrow A.

The fixing roller (first roller) 1 includes a pressure roller (second roller).
The transfer paper S is passed through the roller 2 at a predetermined pressure, and the unfixed toner image on the transfer paper is fixed by the heat generated by the heat source 3 inside the roller 1 and the pressure.

After the fixing, the transfer paper is separated from the peripheral surface of the roller 1 by the separation claw 4, and is discharged out of the fixing device between the discharge rollers 5a and 5b. An oil application felt 6 is in contact with the fixing roller 1, and oil for preventing offset from the oil tray 7 is applied to the peripheral surface of the fixing roller 1 via the application felt 6. . Reference numeral 6a denotes a blade for uniformly adhering oil to the peripheral surface of the fixing roller 1.

FIG. 2 shows the drive components on the back side of the fixing device 100 of FIG. 1. When the unitized fixing device 100 is inserted in the direction of arrow D and loaded into a main body of a copying machine or the like, The intermediate gear 12 on the unit side meshes with the fixing roller driving gear (first roller driving gear) 11 on the copying machine main body side. The fixing device 100 can be pulled out in the direction opposite to the arrow D to perform maintenance.

When the fixing roller driving gear 11 rotates in the above-mentioned meshing state, the fixing roller gear (first roller gear) 13 is rotated via the intermediate gear 12, and the fixing roller 1 is driven to rotate in the direction of the arrow in FIG. It has become. When the fixing roller gear 13 rotates, the paper discharge roller gear 16 is rotated via the gears 14 and 15, and the paper discharge roller 5b shown in FIG. 1 is driven to rotate in the direction of the arrow. The pressure roller 2 may be rotationally driven by a separate drive system, but in the example shown in the figure, the rotation of the fixing roller 1 causes the pressure roller 2 to be driven to rotate.

Next, in order to extend the above-described drive configuration more specifically,
In FIG. 4, a sprocket 9 is fixed to a shaft indicated by reference numeral 18, and a fixing roller driving gear 11 is mounted via a one-way clutch 10, and these are provided on the main body side of the copying machine.

A knob shaft 22 is rotatably supported on the side plates 20, 21 on the fixing device side via bearings 23, 24. One end of the knob shaft 22 is provided between the fixing roller 1 and the pressure roller 2. A knob 25 that is rotated when a paper jam occurs on the transfer paper is fixedly mounted.

The intermediate gear 12 is attached to the other end of the knob shaft 22 so as to be rotatable and movable in the axial direction. The intermediate gear 12 meshes with the fixing roller driving gear 11. The fixing roller 1 is coaxially provided with a fixing roller gear 13, which meshes with the intermediate gear 12.

Here, at the time of fixing, a motor (not shown) on the main body side of the copying machine or the like rotates, and accordingly, a chain (not shown) rotates to rotate the sprocket 9. In this case, the rotation direction of the sprocket 9 is clockwise as viewed from the direction of arrow G in FIG. Hereinafter, the rotation directions of the respective rotating members are all viewed from the direction of arrow G.

When the sprocket 9 rotates clockwise, the shaft 18 also rotates in the same direction. At this time, the fixing roller driving gear 11 rotates clockwise integrally with the shaft 18 via the one-way clutch 10. The one-way clutch 10 is mounted on the shaft 18 so as to transmit a rotational driving force to the fixing roller driving gear 11 only when the shaft 18 rotates clockwise.

When the fixing roller driving gear 11 rotates clockwise, the intermediate gear 12 rotates counterclockwise, and accordingly, the fixing roller gear 13 rotates clockwise. That is, the fixing roller 1
Rotate in the direction of the arrow in FIG.

During such driving, the intermediate gear 12 and a gear release cam body 26 described later rotate integrally, and at this time, the knob shaft 22 also rotates integrally.

An oil pump drive gear 27 is fixed on the knob shaft 22 as shown in FIG. 4, and this gear 27 meshes with another gear 28 as shown in FIG.

A replenishing cam 29 is coaxially provided on the gear 28, and when the revolving cam 29 is rotated via the gears 27 and 28 with the rotation of the knob shaft 22, this causes the actuator lever 31 to swing every rotation. Move. When the lever 31 swings, the lever intermittently pushes the side surface of the oil discharge portion 32 formed of the sleeve, and supplies the oil for preventing offset from the oil tank 33 to the oil tray 7. A check valve (not shown) is provided in the oil discharge section 32.

As described above, when the sprocket 9 rotates at the time of fixing, the fixing roller 1, the oil supply cam 29 (FIG. 3), the paper discharge roller gear 16 (FIG. 2), and the like are driven to rotate.

Here, in FIG. 1, the transfer paper may be jammed between the fixing roller 1 and the pressure roller 2 in some cases. When such a jam occurs, the above-described sprocket 9 stops operating and the fixing roller 1 and the like stop, and in this state, the transfer paper must be removed from between the two rollers and removed. Transfer paper sandwiched between rollers
If the sheet is pulled out as it is, a predetermined pressure is applied between both rollers, so that the transfer sheet may be broken.

Therefore, the fixing roller 1 and the pressure roller 2 are rotated by turning the knob 25 shown in FIG.
(See Fig.), But such a rotation of the knob is performed against the load of the drive system, and the rotation operation becomes heavy, and When turned, the chain comes off the sprocket 9.

Therefore, 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 drive gear 11.However, in this case, the operation of pulling the knob may be performed. Need and this kind of work is really cumbersome.

The embodiment of the present invention has solved such a problem.

As shown in FIGS. 5 (A) and 5 (B), the knob shaft 22 is passed through the center hole 26a of the gear release cam body 26, and at this time, the pin 34 (the fourth ) Are fitted into the lits 26b, 26b of the gear release cam body 26. Thus, the gear release cam body 26 is integrally provided on the knob shaft end side opposite to the side on which the knob 25 is provided.

A cam portion is formed on the gear release cam body 26. That is, as shown in FIG. 5 (B), the portions indicated by H and H1 are high, whereas the portions indicated by L and L1 are low. And between the upper H and L in FIG.
The inclined surface 26d becomes gradually lower in the direction of arrow a.
Also, between the lower side L1 and H1 is an inclined surface 26d that is gradually lowered in the direction of arrow b. The boundary between H and L1 and the boundary between H1 and L are vertical walls perpendicular to the plane of FIG. 5 (B).
26c and 26c.

On the other hand, as shown in FIGS.
In the intermediate gear 12 through which the knob shaft 22 is passed through 12a, the inside of the intermediate gear 12 is hollowed out so as to be formed as a cam portion, and the portion of this cam portion indicated by H2, H3 is high, and L2, The part indicated by L3 is low. Then, in FIG. 7A, an inclined surface 12d gradually lowers in the direction of arrow a between H2 and L2 on the upper side. Further, a portion between L3 and H3 on the lower side is also formed as an inclined surface 12d that becomes gradually lower in the direction of arrow b. The boundary between H2 and L3 and the boundary between H3 and L2 are vertical wall surfaces 12c.

The cam portions of the gear release cam body 26 and the intermediate gear 12 formed in this manner are in press-contact engagement as shown in FIG. 4, and this state is maintained by the extension elastic force of the compression spring 35. ing. That is, the high portion H, H1 and the low portion L, L1 of the gear release cam body 26 are engaged with the low portion L3, L2 and the high portion H3, H2 of the intermediate gear cam portion, and the inclined surfaces are in contact with each other. It is.

Here, as shown in FIG. 1, it is convenient if the transfer paper having a jam between the rollers 1 and 2 can be sent out in both directions of arrows B and C. is there. This embodiment can cope with such a point, and when feeding in the direction B, the knob shown in FIG.
Turn 25 counterclockwise.

When the knob 25 is turned counterclockwise, the gear release cam body 26 and the intermediate gear 12, which are integrated with each other, rotate counterclockwise together with the knob shaft 22 under the action of the extension elasticity of the spring 35. Move. That is, the vertical wall surfaces 26c, 26c of the gear release cam body 26 integral with the knob shaft 22 push the vertical wall surfaces 12c, 12c of the intermediate gear 12 to rotate the intermediate gear 12.

When the intermediate gear 12 rotates counterclockwise, the fixing roller gear 13 meshing with the intermediate gear 12 rotates clockwise integrally with the fixing roller 1, and the transfer paper is fed in the direction of arrow B in FIG. That is, the transfer paper having the jam can be removed.

Here, when the intermediate gear 12 rotates counterclockwise, the fixing roller drive gear 11 rotates clockwise. In this case, the one-way clutch 10 does not transmit the rotation to the shaft 18, the fixing roller driving gear 11 is in an idling state, and does not apply much load to the rotation of the knob 25 in the counterclockwise direction. That is, the transfer paper can be easily sent in the B direction.

Next, when the transfer paper is fed in the direction of arrow C in FIG. 1, the knob 25 in FIG. 4 is turned clockwise.

Here, when the knob 25 is turned clockwise, the spring 35
The intermediate gear 12 integrated with the gear release cam body 26 tends to rotate the fixing roller driving gear 11 in the counterclockwise direction under the action of the stretching elasticity. However, the fixing roller drive gear 11 does not actually rotate.

This is because the one-way clutch 10 locks the fixing roller driving gear 11 with respect to the shaft 18 when the rotation direction of the fixing roller driving gear 11 is counterclockwise. That is, the fixing roller driving gear 11 is practically held in a non-rotating state, and therefore, the intermediate gear 12 meshed with the fixing roller driving gear 11 also does not rotate.

As a result, the fixing roller drive gear 11 applies a rotational load to the intermediate gear 12, and a counterclockwise rotational moment is applied to the intermediate gear 12 as a reaction.
When the thrust force generated by this rotational moment becomes larger than the extension elasticity of the compression spring 35, the intermediate gear
12 is displaced from the fixing roller driving gear 11 by being pushed by the above-mentioned cam portion of the rotating gear release cam body 26 and moving in the direction of arrow F against the elasticity of the spring 35. In other words, the high portion of the cam portion of the gear release cam body 26 that rotates clockwise by the rotation of the knob 25 slides on the inclined surfaces 12d, 12d of the intermediate gear cam portion whose rotation is prevented, and F
Direction, and is detached from the fixing roller drive gear 11.

Even if the intermediate gear 12 is disengaged from the fixing roller driving gear 11, the intermediate gear 12 is held so as to mesh with the fixing roller gear 13.
Therefore, by the subsequent rotation operation of the knob 25, the fixing roller 1 can be rotated counterclockwise as follows, and the transfer paper can be discharged in the C direction.

Here, in FIG. 4, the intermediate gear 12 is provided with a boss 12b that houses one end of the spring 35, and when the intermediate gear 12 is completely displaced from the fixing roller driving gear 11, the boss 12b Are adapted to strike the flange portion of the bearing 23.

The movement amount of the intermediate gear 12 at this time is α, and the height of each cam portion of the gear release cam body 26 and the intermediate gear 12 is β (FIG. 5,
(FIG. 6), if α <β, the engagement between the cam portions remains after the movement of the intermediate gear 12, so that when the knob 25 is turned clockwise, the gear release cam body 26 And the intermediate gear 12 can be rotated while being integrated, and the transfer paper can be sent out and discharged in the C direction. In this case, the rotation of the knob 25 can be performed with an extremely light force because the intermediate gear 12 is disengaged from the fixing roller driving gear 11.

Although the configuration of the cam portion of the gear release cam body 26 and the intermediate gear 12 shown in FIGS. 5 and 6 has been described above, in the present embodiment, a so-called meshing clutch is used. In this case, two opposite inclined surfaces are used.

When the hand is released from the knob 25, due to the extension elasticity of the spring 35, the latter intermediate gear 12 of the gear releasing cam body 26 and the intermediate gear 12 which are in press contact with each other is pressed by the pressing force between the inclined surfaces. Accordingly, the gear release cam body 26 is moved in a direction in which it meshes with the fixing roller drive gear 11, and the gear release cam body 26 rotates to return to the initial state. In order to surely achieve such a function, the angle of the inclined surface is suitably about 20 ° to 40 °. Needless to say, the form and the number of the inclined surfaces can be appropriately changed other than those shown in the drawings.

According to the above-described embodiment, even when the knob 25 is rotated in any direction, the rotation can be performed with an extremely light force, and the operation of pulling the knob 25 is not performed. I'm done. Conventionally, a two-step operation of turning the knob while pulling it was necessary. However, in this embodiment, a one-step operation is sufficient, which is useful for preventing erroneous operation. However, if necessary, the intermediate gear 12 can be removed from the fixing roller driving gear 11 by pulling the knob shaft 22 forward.

Furthermore, the meshing with the fixing roller drive gear 11 can be interrupted only by turning the knob, and no manual operation is required to restore the meshing of the intermediate gear 12 after the jammed paper is removed. And never. Further, when the intermediate gear 12 is loaded with the fixing device 100 in a unit form, or
After the jammed paper is removed, when the intermediate gear 12 is engaged with the fixing roller driving gear 11 in the early stage of engagement when engaging with the fixing roller driving gear 11, even if the intermediate gear 12 is caught on the fixing roller driving gear 11, after the fixing device is started, it is subjected to the action of the extension elasticity of the spring 35. In addition, the intermediate gear 12 can be smoothly meshed with the fixing roller driving gear 11 while moving.

 FIG. 7 shows another embodiment of the present invention.

In the drawing, a fixing roller driving gear 4 having a sprocket portion 41a integrally provided on a shaft 18 provided on the main body side of a copying machine or the like.
1 is fixed, which includes the intermediate gear 42 as in the previous embodiment.
Are engaged. The intermediate gear 42 also meshes with the fixing roller gear 13. The one-way clutch 10 shown in FIG. 4 is not provided.

The inside of the intermediate gear 42 is hollowed out, and a gear release cam body 43 is engaged with a cam portion (described below) formed in the hollowed out portion.

The gear release cam body 43 in this example has inclined planes 43a, 43a forming an angle θ, as shown in FIGS.
A flat portion 43b is formed at the top end, and projections 43d, 43d are provided on both sides of the peripheral surface. FIG. 10 is a sectional view of the gear release cam body 43.

On the other hand, the intermediate gear 42 has, as shown in FIGS. 12 and 13, a cam portion formed by inclined planes 42a and 42a forming an angle θ in a hollow portion inside the intermediate gear 42. Has become. The angle θ is set at about 80 ° to 120 °, and is preferably about 100 °. Both inclined planes 42a
The bottom flat part 42b is provided in the place where it falls, and the hollow inner part is opposed to each other,
Engagement projections 42d, 42d are provided.

The center hole 42e of the intermediate gear 42 in FIG. 13 is passed through the knob shaft 22 shown in FIG. 7, and a pin 34 is fixedly mounted on the shaft end side of the knob shaft 22 as shown in FIG. This pin is fitted
34 is inserted into the slit 43c of the gear release cam body 43. Then, after the shaft end side has been inserted into the center hole 43e of the gear release cam body 43, it is stopped by the E-ring 45 as shown in FIG.

In the state shown in FIG. 7, under the action of the extension elasticity of the compression spring 35, the inclined plane 42a of the intermediate gear 42 (FIG. 13) and the inclined plane 43a of the gear release cam body 43 (FIG. 8) Are in a state of being pressed and engaged with each other.

 Other configurations are the same as the previous embodiment.

Under the above conditions, a paper jam occurs and the transfer paper is
To feed in the direction (FIG. 1), the knob 25 (FIG. 4) provided at the shaft end of the knob shaft 22 is turned counterclockwise.

At this time, the intermediate gear 42 integrated with the gear release cam body 43 is a fixing roller driving gear (first roller driving gear) 41.
To rotate clockwise. However, since the fixing roller driving gear 41 has a load on the main body side,
It does not rotate, but only creates a clockwise rotational moment as a reaction on the intermediate gear 42.

When the knob shaft 22 is turned in a state where such a moment is generated, the flat portion 43b (FIG. 8) of the gear release cam body 43 which rotates integrally with the knob shaft is a two-sided plan view 42a (FIG. 13) of the intermediate gear 42.
), The same surface is pushed and moved, and the intermediate gear 42 is gradually moved in the direction of arrow F against the pressing force of the spring 35, and this is moved from the fixing roller drive gear 41. remove.

With the intermediate gear 42 disengaged from the fixing roller drive gear 41, the boss 42f of the intermediate gear 42 abuts against the spring seat 46. At this time, in this example, the projection 43d of the gear release cam body 43 (FIG. 9)
Are engaged with the engaging projections 42d (FIG. 12) of the intermediate gear 42.

At this stage, the gear release cam body 43 and the intermediate gear 42 rotate integrally, and accordingly, the fixing roller gear 13 is rotated by the intermediate gear 42, and the fixing roller 1 rotates clockwise. The transfer paper is fed and discharged in the direction of arrow B (FIG. 1).

Also in this example, the intermediate gear 42 is a fixing roller driving gear.
Since the knob deviates from 41, the knob can be rotated with a light force.

In order to feed the transfer paper in the direction of arrow C (FIG. 1), the knob shaft 22 shown in FIG. 7 may be turned clockwise. The operation is exactly the same as when the paper is fed in the direction of arrow B. This is because the inclined planes, projections, and the like of the gear release cam body 43 and the intermediate gear 42 are formed symmetrically.

In any case, regardless of whether the knob is turned clockwise or counterclockwise, the gear release cam body 43 pivots and the intermediate gear 42 is disengaged from the fixing roller drive gear 41, and the gear is released. There is no change in that the release cam body 43 and the intermediate gear 42 rotate integrally.

As in the previous embodiment, the intermediate gear 42 can be removed from the fixing roller driving gear 41 even when the cam shaft 22 is pulled toward the user.

By the way, the flat portion 43b of the gear release cam body 43 (eighth
As shown in the figure, the corner portion 43b ₁ slides in a state of point contact with the inclined plane 42a (FIG. 13) during its rotation. It is desirable to use the following material.

For example, it is convenient to use a quenched steel or iron-based sintered material, or a ceramic material. It is also desirable that the material of the mating inclined plane 42a (FIG. 13) be made of the same material, and it is still more effective to use a lubricant or the like.

In FIG. 7, the knob shaft 22 is turned, and the intermediate gear 42 is turned.
From the fixing roller drive gear 41, and further, the intermediate gear 42
After the jammed paper is removed by rotating the gear and the gear release cam body 43 together, the hand is released from the knob 25 (FIG. 4), and the flat portion 43b (FIG. 8) is inclined by the inclined plane 42a (FIG. 13). In this state, the knob shaft 22 is provided with a rotation behavior in the direction opposite to the direction in which the knob shaft 22 has been turned, so that the knob shaft 22 returns to the original rotation position while being rotated in that direction. At this time, the intermediate gear 42 is pushed by the spring 35 to mesh with the fixing roller driving gear 41, and returns to the position shown in FIG.

In this case, the meshing position between the intermediate gear 42 and the fixing roller driving gear 41 is poor, and even if the intermediate gear 42 is stopped at the tooth end, the intermediate gear 42 is pressed by the spring 35 after the body is started.
Reference numeral 42 smoothly meshes with the fixing roller driving gear 41. The same applies when the fixing device 100 is set in the copying machine main body.

In this embodiment, as shown in FIG. 7, the fixing roller driving gear 41 is connected to the shaft 18 without passing through a one-way clutch.
In this case, the desired purpose can be achieved without using such a one-way clutch. That is, the mesh between the gears can be released by turning the knob in any direction. In this example, a one-way clutch is not required, which contributes to cost reduction.

FIG. 14 shows a modification of the above-described embodiment, in which a pin-shaped gear release cam body 53 is fixedly passed through the knob shaft 22, and the gear release cam body 53 is connected to the intermediate gear 52. It is engaged with the bottom of the provided inclined plane 52a.

When the knob shaft 22 is turned, the gear release cam body 53 is tilted flat 52a.
To move the intermediate gear 52 in the F direction. By this movement, the intermediate gear 52 is disengaged from the fixing roller driving gear 41 (FIG. 7), and thereafter, the engagement projection (provided on the intermediate gear 52) while the gear release cam body 53 remains engaged with the inclined flat surface 52a. (Not shown), the gear release cam body 53 and the intermediate gear 52
Will rotate integrally.

In the embodiment shown in FIG. 7 and FIG. 14, the intermediate gear 4
2,52 rotate, and at this time, the gear release cam body 43,53
And the knob shaft 22 rotate integrally, and further, the rotation of the intermediate gears 42 and 52 causes the fixing roller gear 13 to rotate clockwise.

In this case, the load on the knob shaft 22 causes the intermediate gear 4
2, 52 receive a relative sloW force from the gear release cam bodies 43, 53. When this thrust force balances the pressing force of the spring 35, the intermediate gears 42, 52 and the fixing roller driving gear 41
Can be prevented.

In FIG. 1, in the fixing device in which the feeding direction of the transfer paper in which the jam has occurred is set to only one of B and C, the turning direction of the knob 25 is only one direction. I'm done. However, if the sending direction is two directions, the degree of freedom in the sending direction can be increased.

In the embodiment shown in FIGS. 7 to 14, the engaging portion for locking the gear release cam body for integrally rotating the gear release cam body and the intermediate gear when the intermediate gear moves is engaged with the projection 43d. Although constituted by the mating projection 42d, other appropriate means may be used.

Further, in each of the above-described embodiments, the cam portion is formed directly on the intermediate gear. However, the cam portion is attached to the intermediate gear by forming the cam portion on another member that operates integrally with the intermediate gear. Is also good.

Further, the positions of the cam portion on the intermediate gear side and the cam portion on the gear release cam body side may be changed from each other in the state shown in the drawing, or the slopes 26d, 12d, 42a, 43a may be formed as curved slopes. .

As described above, the example in which the sheet processing apparatus according to the present invention is applied to the fixing device has been described. In this example, the first roller is configured as a fixing roller, the second roller is configured as a pressure roller, and Is passed through, and an unfixed image on the paper is fixed. The first roller driving gear is configured as a fixing roller driving gear, and the first roller gear is configured as a fixing roller gear, and the fixing roller gear and the intermediate gear mesh with each other,
At the time of fixing, the fixing roller gear is rotated by a rotational driving force via an intermediate gear by the fixing roller driving gear. However, the present invention is applicable to other sheet processing apparatuses, for example, the first and second paper processing apparatuses. The present invention can be widely applied to a paper transport device having rollers.

Effects As described above, according to the first and second aspects of the present invention, the jammed sheet can be easily sent out and removed from the first and second rollers without pulling. Further, in performing this removal, it is only necessary to turn the knob with a light force without pulling the knob, and the return to the normal driving state can be performed immediately.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a fixing device according to an embodiment of the present invention, and FIG.
FIG. 3 is a perspective view of a driving component of the fixing device, FIG. 3 is an external perspective view of the fixing device, FIG. 4 is a cross-sectional view of the driving component, and FIG. FIG. 5B is a view of the gear release cam body of FIG.
6A is a plan view of the intermediate gear, FIG. 6B is a cross-sectional view taken along line XX of FIG. 7A, and FIG. 7 is a cross-sectional view of a driving component according to another embodiment of the present invention. Fig. 8, Fig. 8 is a side view of a gear release cam body in another embodiment, Fig. 9 is a view of the gear release cam body of Fig. 8 viewed from below, and Fig. 10 is a cross section of the gear release cam body. FIG. 11, FIG. 11 is a perspective view of a gear release cam body, FIG. 12 is a plan view of an intermediate gear, FIG. 13 is a cross-sectional view taken along line YY of FIG. 12, and FIG. It is sectional drawing which shows the assembly state of an intermediate gear and a gear release cam body. 1 First roller 2, 2 Second roller 11,41 First roller drive gear 12,42,52 Middle gear 13 First roller gear 22 Knob shaft, 25 Knob 26,43,53 …… Gear release cam body 42d, 43d …… Engagement part

Claims (2)

(57) [Claims] A first roller driving gear for rotating the first roller; a first roller driving gear for rotating the first roller; a first roller and a second roller; A knob shaft fixedly mounted on one end side when a paper jam occurs between sheets, and a knob shaft rotatably mounted on the knob shaft, and movably provided in the axial direction, An intermediate gear that meshes with the first roller drive gear; and a coaxially integral part of the first roller, meshes with the intermediate gear, and is rotated by the first roller drive gear by a rotational driving force through the intermediate gear. A first roller gear, and a gear releasing cam body integrally provided on the other end side of the knob shaft, wherein the cam is pressed against both the intermediate gear and the gear releasing cam body and relatively slid. Parts are attached, and the cam part When the shaft is rotated, the intermediate gear is moved in a direction to be disengaged from the first roller drive gear, and after this movement, a cam portion is brought into an engaged state in which the gear release cam body and the intermediate gear are integrally rotated. A sheet processing apparatus characterized by comprising: 2. A first roller and a second roller for transporting a sheet between them, a first roller driving gear for rotating the first roller, and a first roller and a second roller. A knob shaft fixedly mounted on one end side when a paper jam occurs between sheets, and a knob shaft rotatably mounted on the knob shaft, and movably provided in the axial direction, An intermediate gear that meshes with the first roller drive gear; and a coaxially integral part of the first roller, meshes with the intermediate gear, and is rotated by the first roller drive gear by a rotational driving force through the intermediate gear. A first roller gear, and a gear release cam body integrally provided on the other end side of the knob shaft, and a cam portion for engaging the intermediate gear and the gear release cam body is provided. When the knob rotates the knob shaft, the gear The intermediate gear is configured to be moved in a direction in which the intermediate gear is disengaged from the first roller drive gear by turning the cam removal member, and after the intermediate gear is moved, the gear release cam body and the intermediate gear are integrally rotated. A sheet processing apparatus comprising an engagement portion for locking a gear release cam body for moving the gear release cam body and the intermediate gear.