KR20010004950A - Apparatus for driving fusing device - Google Patents

Abstract

PURPOSE: A driving device for a fixing device is provided so that paper can be easily removed without requiring a manual operation for releasing a heat roller and a pressing roller. CONSTITUTION: When a driving motor(10) is driven, a driving force is transmitted to a fixing device driving gear(20) through a gear train(11). A driving shaft(21) is rotated with the driving gear(20). Here, a spring clutch(41) is rotated in a winding direction. According to the rotation in the winding direction, the spring clutch(41) is wound around a hub of a vertical driving gear(30), thereby rotating the vertical driving gear(30) in an identical direction. The vertical driving gear(30) rotates a heat roller gear(6a), thereby driving a heat roller(6) and a pressing roller. When paper is jammed between the heat roller(6) and the pressing roller, a controller displays an error message "PAPER JAM" on a display window. When a user pulls the paper, the heat roller(6) and the pressing roller are rotated, and thus the vertical driving gear(30) is rotated. The rotation of the vertical driving gear(30) does not influence on the spring clutch(41). Thus, the driving gear(20) is not rotated. Accordingly, an entire driving load is not applied to the heat roller(6). As a result, the user can easily remove the jammed paper.

Description

Drive unit of fuser unit {APPARATUS FOR DRIVING FUSING DEVICE}

The present invention relates to a drive device of a fuser, and more particularly, to a drive device of the fuser to prevent the load on the fuser when the paper jammed in the fuser is removed.

In general, a laser beam printer includes a main body 1, a paper feed cassette 2 on which a plurality of sheets are loaded, a pickup roller 3 picking up sheets of paper loaded on the paper feed cassette 2, and a pickup It consists of a conveying roller 4 for conveying the paper, a developing device 5 for forming an image on the surface of the conveyed paper, a heat roller 6 and a pressing roller 7 in contact with a predetermined bite force. And a fixing roller 8 for fixing the formed image with heat and frictional force, and a discharge roller 9 for discharging the completed paper to the outside of the machine.

Although the driving means of the laser beam printer is not shown in the figure, the driving motor is composed of a drive train and a gear train for transmitting the rotational force of the driving motor to each of the roller-type devices.

When the operation state of the conventional laser beam printer configured as described above is briefly described, when the operation of the device is started, a current is applied to the drive motor so that the rotational force of the drive motor passes through the pickup roller 3, the transfer roller 4, It is transmitted to the heat roller 6 and the compression roller 7 of the fixing unit 8, and the discharge roller 9, and each roller rotates.

The paper picked up by the pickup roller 3 is conveyed to the developing unit 5 side by the rotational force of the conveying roller 4, and the developing unit 5 forms an image on the surface of the conveyed paper.

An image formed on the surface of the paper is fixed by heat and pressing force while passing between the heat roller 6 and the pressing roller 7 of the fixing unit 8, and the paper which has been fixed is discharged to the outside of the machine by the discharge roller 9 do.

On the other hand, when a paper jam occurs in each roller-type device, an error message "PAPER JAM" is displayed on the display window, and the driving of the machine is stopped. The user manually removes the paper. same.

For example, when the paper is jammed between the heat roller 6 and the pressing roller 7 of the fixing machine 8, the user pulls the paper, and the friction force between the paper and the rollers 6 and 7 is driven entirely. If the load is larger than the load, the paper is removed while the rollers 6 and 7 are rotated together. At this time, the unfixed toner is partially fixed through the pressure.

If the frictional force between the rollers 6 and 7 is less than the total driving load, the paper slips out between the rollers 6 and 7.

However, due to the biting force of the heat roller 6 and the pressing roller 7, a malfunction occurs such that the paper is not easily removed and torn, and in order to prevent such a phenomenon, the heat roller 6 and the pressing roller ( A method for removing the bite force of 7) is provided.

As a method, the cover roller (not shown) of the fixing unit 8 is detached and the heat roller 6 is separated, and a pressure roller is applied to the press roller 7 by the operation of the lever. And a method of spaced apart from (6).

However, according to the driving apparatus of the conventional fuser configured as described above, when the paper is forcibly pulled out and removed, the toner unfixed by the load applied to the rollers 6 and 7 is stored in each roller 6 and 7. Since the contaminants lose their properties as a fixing unit, there is a problem that image quality is lowered and durability is lowered.

In addition, in order to remove the paper to apply excessive force, paper removal work was very difficult and cumbersome. In addition, a very large load is applied to the fixing unit 8 so that the paper may be torn, and a part of the torn paper may remain inside the fixing unit to degrade image quality.

Then, in the case of a specification in which the heat roller 6 is separated from the pressing roller 7 to remove the biting force of each roller 6, 7 so as not to apply an excessive force during the paper removing operation, the user is used whenever the paper is jammed. There is inconvenience and hassle to remove cover or operate lever manually.

The present invention has been made to solve the problems described above, when removing the paper jam in the fuser to remove the drive load on each roller so that each roller is free to rotate so that the unfixed toner does not contaminate the roller surface It is an object of the present invention to provide a driving device of a fixing unit.

In addition, another object of the present invention is to be able to remove the paper jammed in the fuser without applying excessive force.

In addition, another object of the present invention is to release the load on the fuser even without performing a separate manual operation to remove the paper jammed in the fuser.

1 is a schematic diagram of a typical laser beam printer.

2 is a configuration diagram of a driving device of a laser beam printer to which an embodiment according to the present invention is applied.

Figure 3 is a perspective view showing one embodiment of the clutch means applied to the embodiment according to the present invention.

Figure 4 is a side view showing an embodiment of the clutch means applied to the embodiment according to the present invention.

Figure 5 is a perspective view showing another embodiment of the clutch means applied to the embodiment according to the present invention.

Figure 6 is a side view showing another embodiment of the clutch means applied to the embodiment according to the present invention.

Figure 7 is a plan view showing another embodiment of the clutch means applied to the embodiment according to the present invention.

<Description of the code used in the main part of the drawing>

10: drive motor 20: drive gear

21: drive shaft 22,32: locking part

30: driven gear 41: spring clutch

The driving apparatus of the fixing unit of the present invention for achieving the above object, a drive motor, a drive unit driven by the drive motor as a drive source, a driven unit for transmitting the driving force of the drive unit to the fuser, and the drive unit A clutch means for selectively transmitting power to the follower and blocking the driving force of the follower if the follower is first driven so as not to be transmitted to the drive, thereby removing the paper jammed between the fuser; Driving the eastern part is characterized in that the drive unit is not driven by the clutch means.

Preferably, the clutch means is a spring clutch installed between the driving part and the driven part to restrain the driven part to rotate only in one direction.

Preferably, the clutch means is a latch formed on one side of the driving part to restrain the driving force of the driving motor to be transmitted only in one direction to the driven part.

It is preferable to further include an elastic member for elastically supporting the driven part toward the driving part side.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the drive device of the fuser according to the present invention will be described in detail.

2 is a configuration diagram of a driving apparatus of a laser beam printer applied to an embodiment according to the present invention, FIG. 3 is a perspective view showing an embodiment of a clutch means applied to an embodiment according to the present invention, and FIG. Figure 5 is a side view showing the installation state of one embodiment of the clutch means applied to the embodiment, Figure 5 is a perspective view showing another embodiment of the clutch means applied to the embodiment according to the present invention, Figure 6 is an embodiment according to the present invention Fig. 7 is a side view showing another embodiment of the clutch means applied to the example, and Fig. 7 is a plan view showing the structure of another embodiment of the clutch means applied to the embodiment according to the present invention. For convenience of description, the same member numbers are assigned to the same constituent members as in the prior art.

Referring to FIGS. 1 to 4, the driving apparatus of the fixing unit of the present invention includes a drive motor 10, a gear train 11 transmitting a driving force of the drive motor 10, and a gear train 11. A fuser drive gear 20 that receives rotational force, a driven gear 30 installed on the drive shaft 21 of the drive gear 20 so as to be idling, and meshed with the heat roller gear 6a of the fuser unit 8; It comprises a clutch means for transmitting the rotational force of the drive gear 20 to the driven gear 30 and the rotational force is not transmitted to the drive gear when the driven gear 30 rotates.

As the clutch means, the cylinder 40 is inserted between the drive gear 20 and the driven gear 30 while being fitted to the drive shaft 21 and inserted into the cylinder 40 while being fitted to the drive shaft 21. One end is fixed to the drive gear 20, the other end is fixed to the cylinder 40, and a portion is composed of a one-way spring clutch 41 is disposed on the hub 31 of the driven gear 30.

As described above, the operation state of the driving device of the fuser of the present invention to which the spring clutch is applied is as follows.

When the operation of the device is started, the drive motor 10 is driven, and this driving force is transmitted to the fuser drive gear 20 through the gear train 11, and the driving shaft 21 rotates integrally with the drive gear, so that the spring clutch ( 41) rotates in the winding direction.

By rotating the spring clutch 41 in the winding direction, the spring clutch 41 is wound around the hub 31 of the driven gear 30 to rotate the driven gear 30 in the same direction.

The driven gear 30 drives the heat roller 6 and the compression roller 7 by rotating the heat roller gear 6a.

On the other hand, if a sheet of paper is caught between the heat roller 6 and the pressing roller 7 of the fixing unit 8, the controller (not shown) displays an error message "PAPER JAM" on the display window.

When the user pulls to remove the paper, the heat roller 6 and the compression roller 7 are rotated, and the driven gear 30 is rotated by the rotation of the heat roller 6, the rotation of the driven gear 30 The drive gear 20 does not rotate because it does not restrain the spring clutch 41. In other words, the entire driving load is not applied to the heat roller 6.

Hereinafter, another embodiment of the clutch means applied to the embodiment according to the present invention will be described.

As shown in FIGS. 5 to 7, engaging portions 22 and 32 are formed on opposite surfaces of the fuser drive gear 20 and the driven gear 30, respectively. When the drive gear 20 is rotated in the driving direction, the driven gear 30 is rotated, while the driven gear 30 is inclined in one direction so as to be spaced apart from the drive gear 20 when the driven gear 30 is driven first. The coil spring 50 is formed on the other side of the driven gear 30 to elastically support the driven gear 30 toward the drive gear 20, and the coil spring 50 is supported at the end of the drive shaft 21. The support member 51 is coupled.

Referring to the operation state of the latch-type clutch configured as described above is as follows.

When the operation of the device is started, the driving motor is driven, and the driving gear 20 is rotated by the driving force, and the locking part 22 is rotated when the driving gear 20 is rotated due to the structure of the locking parts 22 and 32. The driven gear 30 is rotated in the same direction while pushing the locking step 32a of the locking portion 32 of the driven gear 30.

The heat roller 6 is rotated by the rotational force of the driven gear 30 to rotate the pressing roller 7.

On the other hand, when a paper jams between the heat roller 6 and the pressing roller 7, the control unit displays an error message "PAPER JAM" on the display window.

When the user pulls the paper to remove it, the heat roller 6 is rotated to rotate the driven gear 30.

The driven gear 30 rotates while the locking portion 32 of the driven gear 30 passes along the inclined portion 22a of the locking portion 22 of the drive gear 20, and the driven gear 30 is a coil. It is spaced apart from the drive gear 20 while compressing the spring 50.

As the driven gear 30 is rotated while being driven away from the drive gear 20 as described above, the paper is removed by the force of pulling the paper.

As the paper is released from the heat roller 6 and the pressing roller 7, the heat roller 6 is in a free movement state, and the driven gear 30 is moved toward the driving gear 20 by the elastic force of the coil spring 50. Each engaging portion 22, 32 is engaged.

As described above, when the device is restarted, the drive gear 20 drives the fixing unit by rotating the driven gear 30.

Accordingly, when the paper is pulled to remove the paper, the paper is removed while the rollers 6 and 7 are rotated by the friction force between the paper and the rollers 6 and 7, and the rotational force is driven by the clutch means. Since it is not transmitted to 20, the entire driving load is not applied to the heat roller 6. That is, since the bite force between the heat roller 6 and the pressing roller 7 becomes small, the toner unfixed on the surface of the paper does not contaminate the roller.

In addition, the rollers 6 and 7 can be rotated even if less force is applied than before.

In addition, in order to solve the biting force between the heat roller 6 and the pressing roller 7, it is not necessary to open the cover every time or operate a separate biting force removing device as in the prior art.

As described above, according to the driving apparatus of the fixing unit of the present invention, since contamination of the roller is prevented, image quality and durability of the product can be improved.

In addition, even if a small force is applied, the paper can be removed, thereby improving workability for maintenance of the machine.

In addition, it is possible to improve the reliability of the product because it does not need to perform a separate manual work to remove the paper.

Claims (4)

A drive motor, a drive unit driven by using the drive motor as a drive source, a follower for transmitting the driving force of the drive unit to the fixing unit, and selectively transmitting power of the drive unit to the follower, while the driven unit is driven first And a clutch means for blocking the driving force of the driven part from being transmitted to the driving part. When the driven part is driven to remove the paper jammed between the fixing unit, the driving part is not driven by the clutch means. A drive device of the fixing unit. 2. The driving apparatus of the fixing unit according to claim 1, wherein the clutch means is a spring clutch provided between the driving unit and the driven pour to constrain the driven unit to rotate only in one direction. 2. The driving apparatus of claim 1, wherein the clutch means is a latch formed at one side of the driving part to restrain the driving force of the driving motor to be transmitted only in one direction to the driven part. 4. The drive device of the fuser according to claim 3, further comprising an elastic member for elastically supporting the driven part toward the driving part side.