JPS6333226Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a roller drive device for a copying machine.

Conventionally, in an electrophotographic copying machine, for example, in a heat fixing device, when copy paper jams between a pair of fixing rollers, it has been necessary to pull out the heat fixing device from the body of the copying machine in order to remove the copy paper. I'm trying to make it possible. However, it is troublesome to pull out the heat fixing device from the machine every time a copy paper jam occurs. Moreover, when installing the heat fixing device on the machine, it is necessary to engage gears, etc. in order to connect it to the drive source of the copying machine.
The installation work was complicated. If the fixing roller could be rotated without pulling out the heat fixing device from the machine body, it would be convenient because the jammed copy paper could be easily removed. However, conventionally, the drive source of the copying machine is stopped when a copy paper jam occurs, and it is difficult to manually rotate the fixing roller, which is connected to the drive source via a gear or the like. It was hot.

Therefore, an object of the present invention is to provide a system that allows the roller connected to the drive source to be easily rotated without being pulled out from the body of the copying machine, and also to be easily attached even when the roller is pulled out from the body of the copying machine. It is an object of the present invention to provide a roller drive device that has the following features.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a heating fixing device 1 according to an embodiment of the present invention.
FIG. 2 is a partially cutaway perspective view of FIG. This heating fixing device 1
can be pulled out from the body 18 of the electrophotographic copying machine laterally (to the left in FIG. 2) in the direction indicated by the arrow 13. A frame 2 of the heat fixing device 1 is provided with a pair of fixing rollers 3 and 4 that are parallel to each other and have horizontal axes. One of the fixing rollers 3 is rotatably supported by the frame 2. Inside this fixing roller 3,
Heater 5 is interpolated. The heater 5 is connected to a power source (not shown) via a connection terminal 7 fixed to the frame 2. The other fixing roller 4 is pivotally supported by a lever 6. One end of the lever 6 is pivotally supported on the frame 2 by a pin 8. The other end of the lever 6 is urged upward by a spring 9, thereby pressing the fixing roller 4 against the fixing roller 3.

The copy paper transport path is indicated by reference numeral 10 in FIG.
The copy paper is guided between a pair of fixing rollers 3 and 4 in the direction shown by arrow 11. A toner image corresponding to the original is formed on the copy paper guided between the fixing rollers 3 and 4. A peeling plate 12 is provided on the downstream side of the fixing roller 3 for removing toner adhering to the fixing roller 3 and peeling off copy paper wrapped around the fixing roller 3.

FIG. 3 shows the fixing rollers 3 and 4 of the heat fixing device 1.
FIG. A first gear 14 and a second gear 15 are fixed to both ends of the rotation shaft of the fixing roller 3, respectively. An operating knob 16 having a rotational axis parallel to the axis of the fixing roller 3 is pivotally supported on the front side wall 2a of the frame 2 along the pull-out direction 13 of the heat-fixing device 1. A gear portion 17 that meshes with the first gear 14 is formed on the operating knob 16 .

An opening portion 19 from which the second gear 15 of the heat-fixing device 1 projects is formed in the body 18 of the copying machine corresponding to the rear side wall 2b along the pull-out direction 13 of the frame 2. A bracket 20 is fixed to this opening portion 19, and a pivot 21 having an axis parallel to the fixing roller 3 is fixed to the bracket 20 so as to protrude inward of the body 18, that is, toward the heat fixing device 1 side. A cylindrical rotating member 22 is loosely fitted into the pivot shaft 21 so as to be freely rotatable. A sprocket wheel 23 is fixed to one end of the rotating member 22 (the right end in FIG. 3). This sprocket foil 23
A chain 35 connected to a drive source (not shown) is wound around the chain 35 . Heat fixing device 1 for rotating member 22
A third gear 25 is attached to the other end of the gear via a one-way roller clutch 24. Third gear 25
can be connected and meshed with the second gear 15 of the heat fixing device 1 .

FIG. 4 is an axially perpendicular cross-sectional view showing a portion of the one-way roller clutch 24. As shown in FIG. The output end member 26 is fixed to the inner peripheral surface of the third gear 25. The output end member 26 is formed with a recess having an inclined surface 28 spaced apart in the circumferential direction and radially outwardly away from the rotating member 22 toward the rear in the rotational drive direction 27 . A roller 29 is interposed between the inclined surface 28 and the outer peripheral surface of the rotating member 22. The spring 30 applies a resilient force to the roller 29 toward the front in the rotational drive direction 27 .

When the rotating member 22 rotates in the rotation driving direction 27, the rollers 29 are elastically twisted by the spring 30 and bite into between the inclined surface 28 and the outer peripheral surface of the rotating member 22, as shown in FIG. Therefore, the rotational power from the rotating member 22 is transmitted to the output end member 26 and the third gear 25 via the rollers 29, and the third gear 25 is rotationally driven integrally with the rotating member 22. Rotating member 22
When the roller 29 is stopped, the roller 29 does not bite between the inclined surface 28 and the outer peripheral surface of the rotating member 22 as shown in FIG. In this state, the one-way roller clutch 24, together with the third gear 25,
The third gear 25 can be freely displaced along the axis of the rotating member 22, and the third gear 25 can be moved around the rotating member 22 in the direction indicated by the arrow 31, that is, in the same direction as the rotational drive direction 27, without transmitting rotational power to the rotating member 22. It can be idled.

Such a one-way roller clutch 24 has the advantages of a large transmission torque, a quick response when the transmission of the driving force starts, and the possibility of making it compact.

Between the sprocket wheel 23 and the third gear 25, there is a conical coil spring 3 surrounding the rotating member 22.
2 is provided. The spring force of the spring 32 urges the third gear 25 in a direction away from the sprocket wheel 23 along the axis of the rotating member 22. Displacement of the third gear 25 away from the sprocket wheel 23 is limited by a blocking member 33 provided at the free end of the pivot shaft 21.

In the third gear 25, a conical inclined surface 34 whose diameter becomes smaller toward the drawing direction 13 is formed at the peripheral edge of the front end face along the drawing direction 13 of the heat fixing device 1. Note that the second gear 15
A conical inclined surface may be formed on the peripheral edge 15a of the rear end surface along the pull-out direction 13, and it is sufficient that a conical inclined surface is formed on at least one of the second and third gears 15, 25. .

When the heat fixing device 1 is mounted on the body 18 of the copying machine as shown in FIG.
3, the rotation member 22, the one-way roller clutch 24, the third gear 25, and the second gear 15 are transmitted to the fixing roller 3. The other fixing roller 4 is in pressure contact with the fixing roller 3 and rotates accordingly, and the copy paper on which the toner image is formed is transferred to the fixing rollers 3 and 4.
It is heated and fixed in between.

Assume that a copy paper jams between the fixing rollers 3 and 4 in such a heat fixing device 1. When a paper jam occurs, the paper jam is detected by a detection means (not shown), and the drive of the chain 35 is stopped, and therefore the rotational drive of the fixing rollers 3 and 4 is stopped. Therefore, the heat fixing device 1 is
8, rotate the operating knob 16. The rotation operation direction is gear part 1
7 and the first gear 14, the fixing roller 3 rotates in the direction in which the copy paper is ejected. When the rotating member 22 is stopped, the third gear 25 rotates the fixing roller 3 in the direction of the arrow 31 as shown in FIG. In addition, it can freely rotate around the rotating member 22. Therefore, when a paper jam occurs, by rotating the operating knob 16, the fixing roller 3 and the fixing roller 4 that follows the fixing roller 3 can be rotationally driven in the direction in which the copy paper is ejected. Therefore, without pulling out the heat fixing device 1 from the machine body 18, the operation knob 16 can be rotated to remove the jammed copy paper from the arrow 11.
It can be transported and taken out in the direction (see Figure 1).

If the jammed copy paper cannot be removed even by rotating the operating knob 16, the heat fixing device 1 is pulled out from the machine body 18 in the pull-out direction 13. During this pulling operation, the second gear 15 and the third gear 25 are disengaged. If the heat fixing device 1 is removed from the machine body 18,
Copy paper jammed between fixing rollers 3 and 4 can be reliably taken out.

After taking out the copy paper, attach the heat fixing device 1 to the machine body 1.
8, the heat fixing device 1 is pushed in the direction opposite to the pull-out direction 13. During this pushing operation, the peripheral edge 15a of the second gear 15
contacts the conical inclined surface 34 of the third gear 25, and resists the spring force of the conical coil spring 32 to rotate the third gear 25.
toward the sprocket wheel 23. Moreover, the peripheral edge 15a of the second gear 15 is similar to the third gear 2.
It is in contact with the conical inclined surface 34 of No. 5. Therefore,
When the meshing positions of both gears 15 and 25 match,
The third gear 25 is meshed with the second gear 15 by the spring force of the conical coil spring 32. Therefore, when attaching the heat fixing device 1 to the body 18, the second
And meshing of the third gears 15 and 25 is easily achieved.

As another embodiment of the present invention, the heat fixing device 1 may be configured to be pulled out to the right in FIG.
In this case, the third gear 25 is urged in a direction approaching the sprocket wheel 23, and the peripheral edge of the front end face of the third gear 25 in the pulling direction and the peripheral edge of the end face of the second gear 15 on the rear side in the pulling direction. A conical inclined surface is formed on at least one of them.

The present invention can be implemented not only in the heat fixing device of the above-described embodiments, but also in connection with a pressure fixing device.

As described above, according to the present invention, the driving force from the drive source of the copying machine is transmitted to the roller via the one-way clutch, and an operating knob for rotating the roller is provided, so that the drive source stops. The roller can be easily rotated without being pulled out from the machine body when the machine is in use. In addition, when attaching the frame body with the roller attached to the machine body, the third gear which is urged in the pulling direction and connected to the drive source and the second gear fixed to the other end of the roller are brought into contact with the conical inclined surface. Since we made them touch, by pushing the frame,
The second gear and the third gear are easily meshed with each other, thus making it easier to attach the gear to the aircraft body and improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a simplified side view of a heat fixing device 1 according to an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view, and FIG. 3 is a fixing roller 3, 4 of the heat fixing device 1. A cross-sectional view developed on a cutting plane that includes the axis of
FIG. 4 is an axially perpendicular sectional view showing a portion of the one-way roller clutch 24. As shown in FIG. 1... Heat fixing device, 2... Frame, 3, 4...
Fixing roller, 13... Pulling out direction, 14... First gear, 15... Second gear, 16... Operation knob, 17... Gear part, 18... Body, 22...
Rotating member, 24... One-way roller clutch, 25...
...Third gear, 32... Conical coil spring, 34...
Conical slope.

Claims (1)

[Claims for Utility Model Registration] A frame body on which a roller is rotatably mounted and which can be pulled out from the body of a copying machine along the axis of rotation of the roller, a first gear fixed to one end of the roller, and a first gear. an operating knob having a gear portion meshing with the roller and pivotably supported on a frame body so as to be rotatable about an axis parallel to the roller; a rotating member supported and rotationally driven by a driving force from a driving source; a second gear fixed to the other end of the roller; a one-way clutch mounted on the rotating member so as to be freely displaceable in the axial direction; a third gear fixed to the outer periphery of the directional clutch and capable of meshing with the second gear; and a spring that attaches and biases the third gear forward in the pulling direction, and a peripheral edge of the rear end face of the second gear in the pulling direction. A copying machine characterized in that a conical inclined surface having a smaller diameter toward the drawing direction is formed over the entire circumference on at least one of the peripheral edge of the end face on the front side in the drawing direction of the third gear and the third gear. Roller drive device.