JPH0548206Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field The present invention is a fixing device that can be used in electrophotographic machines, electrostatic printers, etc. It relates to something that sticks and sticks.

(b) Prior Art The oil feed roller is fixed to the lower roller, and it is necessary to apply a pressing force of more than a predetermined value to the lower roller immediately after the oil feed roller is installed. Therefore, a load was placed on the lower roller. In addition, when used for a long period of time, the outer diameter of the oil feed roller becomes smaller, and the pressing force on the lower roller decreases. could not be completely removed.

Therefore, in the fixing device described in Japanese Patent Application Laid-Open No. 60-222879, the fixing device rotates while being pressed against each other.
In a fixing device that fixes an unfixed toner image by inserting a sheet of paper on which an unfixed toner image is formed between a pair of rolls, at least one of which is a heating roll, at least one of the pair of rolls has a The above-mentioned problems are solved by providing an endless belt that rotates in pressure contact with the roll surface as a supply member for applying the molding agent, and by pressing this endless belt with an elastic member via a pressure plate. There is.

(c) Problems to be solved by the invention However, in the above-mentioned Japanese Patent Application Laid-Open No. 60-222879, the pressure plate and the elastic member work to always completely coat the roller with oil and to remove the toner adhering to the roller. Although it can be completely removed, the mechanism is complicated and the work such as replacement is complicated.

The present invention was developed in view of the above problems, and it completely coats the roller with oil, completely removes the toner adhering to the roller, and removes the toner around the oil supply member (oil feed roller). The present invention aims to provide a fixing device that has a simple mechanism and can be easily replaced.

(d) Means for Solving Problems The present invention comprises an upper roller and a lower roller that rotate while being pressed against each other, and the recording paper on which the unfixed toner image is formed is moved between the upper roller and the lower roller. In order to solve the above-mentioned problem, in a fixing device that fixes an unfixed toner image by inserting the toner image into the fixing device, an oil supply member is provided on at least one of the upper roller and the lower roller in pressure contact with the surface of the roller. ,
An elastic lever that rotatably holds the oil supply member, a locking means that locks the vicinity of the free end of the elastic lever with the oil supply member pressed against the roller, and a locking means that locks the oil supply member in pressure contact with the roller. holding means for holding the rotation fulcrum of the elastic lever together with the stop;
The pivot point of the elastic lever can be detached from the holding means by releasing the locking of the locking means.

(E) Effect By having the above-mentioned configuration, the oil supply member always applies stable pressure to the roller even when its outer diameter changes, and can completely coat the roller with oil. Not only can the toner adhering to the roller be completely wiped off, but also the work required to replace the oil supply member is simply to release the locking state of the locking means, which simplifies the work.

(f) Example The drawings are all examples of the present invention, and the drawings are examples of the present invention.
The figure is a partial perspective view of the front side, Figure 2 is a partial exploded perspective view of the front side, Figure 3 is a sectional view, Figure 4 is a partial side view of the front side, and Figure 5 is an exploded perspective view of the area around the elastic lever. , Fig. 6 is a perspective view, Fig. 7, Fig. 8
The figure is a partial sectional view, and FIG. 9 is an exploded perspective view of the solenoid.

In the figure, since the front side and the rear side are constructed in the same way, only the front side will be explained, and the explanation of the rear side will be omitted. Note that parts on the rear side that correspond to the front side are given the same numbers as those on the front side. 1 is a bottom plate, and a screw 5 is screwed into an opening 2 provided in the bottom plate 1 and an opening 6 formed in a bent portion 4 facing the frame 3, and the bottom plate 1 and the frame 3 are screwed together. is fixed. A pin 8 is caulked into the opening 7 of the frame 3, and the pin 8 is fitted into an opening 10 provided in the lever 9. Reference numeral 11 denotes an E-ring, which is attached to the groove 12 of the pin 8 and prevents the lever 9 from coming off. A lower roller 15 is rotatably fixed in a notch 13 provided in the lever 9, and an upper roller 14 with a built-in heater is provided in an opening 16 provided in the frame 3.
is rotatably attached. Further, a shaft 74 is inserted through an opening 74' provided in the lever 9, and a portion of the shaft 74 is exposed on the front side (and rear side) of the opening 74'. An elastic lever 75 is attached to the exposed portion of the shaft 74.
The notches 76 are engaged. Further, 77 is a ball bearing, and the V-shaped portion 8 of the elastic lever 75 is inserted into the groove 78 provided in the ball bearing 77.
2'. A shaft 81 of an oil supply member (oil feed roller) 80 is inserted into an opening 79 of the ball bearing 77 with the elastic lever 75 and the ball bearing 77 integrated (see FIG. 4). The elastic lever 75 is formed of a V-shaped portion 82' and an elastic portion 82 made of an elastic material. Further, 17 is a shift plate, and this shift plate 17 has openings 20 for temporarily fixing the shift plate 18 with screws 19.
is provided. 21 is a notch into which the screw 19 can be inserted. The shift plate 17 is provided with a long hole 22, and the bent portion 2 of the shift plate 18
3 are engaged, and this bent portion 23 can move up and down in the elongated hole 22. A pin 26 caulked to a frame holder 25 is fitted into an opening 24 provided in the shift plate 17 while the shift plates 17 and 18 are connected. Further, a pin 27 caulked to the shift plate 17 is slidably engaged in a long hole 29 provided in the frame 28. Screws (not shown) are inserted into the opening 31 formed in the bent portion 30 provided in the plate holder 25 and the opening 32 provided in the bottom plate 1.
is screwed in to fix the plate holder 25 and the bottom plate 1.

The frame 28 includes a photomicro sensor 33,
cover 34, paper guide 35, separation claw 36,
A pair of transport rollers 37, 38, etc. are fixed.

Reference numeral 39 denotes a spring (elastic member), which connects an opening 40 provided in the lever 9 with a notch 41 provided in the shift plate 18. In order to adjust the biasing force of the spring 39, a screw 44 is screwed into an opening 42 provided in the shift plate 17 and an opening 43 provided in the shift plate 18.
The reference numeral 2 denotes a clearance hole, and the opening 43 is tapped, so that the bent portion 23 can move within the elongated hole 22 by tightening or loosening the screw 44 .

More specifically, when the plate 28 and the like (opening/closing member) are tilted outward (when opened) as shown in FIG. 1, there is a gap between the upper roller 14 and the lower roller 15. This is because the lower roller 15 is rotatably attached to the lever 9, and the lever 9 is biased by a spring 39 connected to the shift plates 17, 18, which tilt outward about the pin 26. That is, the lever 9 rotates about the pin 8 due to the biasing force of the spring 39, and the lower roller 15
moves in a direction away from the upper roller 14. On the other hand, when the plate 28 and the like are placed in the state shown in FIG. 3 (when closed), the upper roller 14 and the lower roller 15 are brought into pressure contact.

By adjusting the screw 44, the pressing force between the upper roller 14 and the lower roller 15 can be adjusted. Therefore, the paper that has passed through the transport section (not shown) passes through the paper guide 35 as shown in FIG.
If adjustment is necessary when the paper passes between the upper roller 14 and the lower roller 15 and is discharged by the transport roller pair 37 and 38, first loosen the screw 19 and adjust the spring pressure of the spring 39 with the screw 44. By tightening the screw 19 again, the pressing force between the upper roller 14 and the lower roller 15 can be adjusted.

In addition, as mentioned above, the lever 9 and the shift plate 1
7, 18, and plate 28,
By pulling the handle 46 fixed to the plate 28 in the direction of the arrow in FIG. 3, the state shown in FIG. 1 is achieved, and at this time, various members fixed to the plate 28 also move together.

A handle 46 is fixed to the plate 28, and a shaft 48 is rotatably fixed to the aperture 47.
A shaft 51 is connected to this shaft 48 by a connecting member 49 and is slidable within an elongated hole 50. In the state shown in FIG. 3, the shaft 51 fits into a notch 52 formed in the frame 3, and the movable parts consisting of the lever 9, shift plates 17, 18, plate 28, etc. are connected to the plate 3, the bottom plate 1, It is locked against the upper roller 14 and the like.

Here, the features of the present invention will be explained in detail with reference to FIGS. 4 and 5.

When the elastic lever 75 is rotated clockwise in the figure about the notch (rotation fulcrum) 76 held by the shaft (holding means) 74, the oil feed roller 80 is pressed against the lower roller 15. At this point, the vicinity of the free end of the elastic lever 75 is attached to the frame 3.
It is hooked onto a pin (locking means) 83 provided in the.
Since the pin 83 is provided with a flange, the elastic lever 75 is reliably locked in a state in which the oil feed roller 80 and the lower roller 15 are pressed. Therefore, even if the outer diameter of the oil feed roller 80 becomes smaller, the pressing force on the lower roller 15 does not decrease and toner can be reliably removed. Further, the shaft 74 passes through the opening 74' of the lever 9, and the exposed portion thereof serves as a pivot point for the elastic lever 75, so that the shaft 74 and the elastic lever 75 move in conjunction with the movement of the lever 9.

Next, a procedure for replacing the oil feed roller 80 will be described.

First, from the closed state of the opening/closing member, the opening/closing member is opened as shown in FIG. 4 (only a portion of the opening/closing member is shown in FIG. 4). Then, the vicinity of the free end of the elastic lever 75 is removed from the pin 83. Next, the elastic lever 75 is rotated counterclockwise in the figure, and both the front and rear elastic levers 75 and the oil feed roller 80 are pulled out from the opening 84. Finally, by removing the oil feed roller 80 from the elastic lever 75 in this extracted state, the removal operation of the oil feed roller 80 is completed. Furthermore, in order to install a new oil feed roller 80, the above-mentioned operation may be performed in reverse.

Therefore, the oil feed roller 80 can be replaced simply by rotating the elastic lever 75 and attaching and detaching the elastic lever 75 (the elastic lever 75 can be attached and detached by simply removing the notch 76 from the shaft 74). I can do it.

In the embodiment of the present invention, the oil supply member 80 is pressed against the lower roller 15, but it may be configured so that it is pressed against the upper roller 14. Moreover, when the lower roller 15 is coated with oil, the upper roller 14 can also be indirectly coated with oil.

36 is a separation claw, and the opening 53 of the plate 28
It is rotatable together with a shaft 54 rotatably fixed to.

55 is a bracket for mounting the photomicro sensor 33, and is fixed to the plate 28. The photomicro sensor 33 is equipped with a sensor lever 56, and the tip of the sensor lever 56 is exposed through an opening 57 formed in the paper guide 45. The photomicro sensor 33 fixed to the frame 28 and the sensor lever 56 constitute a jam detection means.

Therefore, the paper that has passed through the conveyance section passes through the paper guide 45, passes between the upper roller 14 and the lower roller 15, as shown in FIG. While slidingly contacting the sensor lever 56 exposed at the side, the sheet passes through the sensor lever 56 and is discharged by a pair of rollers 37 and 38. At this time, the amount of exposure of the sensor lever 56 from the paper guide 45 remains constant no matter how many times the movable part is rotated.

Next, a method of adjusting the approach angle of the paper sent from the transport section will be explained. As shown in FIG. 6, the bottom plate 1 has a solenoid plate 5.
8 is attached with screws 60, and a solenoid 59 is attached to this solenoid plate 58 with screws 72. 61 is a paper guide support member to which the paper guide 45 is fixed with a screw 62; this paper guide 45 and the paper guide support member 61 constitute a guide member. A shaft 74 is inserted through the paper guide support member 61 . Therefore, the paper guide 45 and the paper guide support member 61 are rotatably fixed to the bottom plate 1 and the frame 3. To adjust the paper entrance angle, first, the paper guide support member 61
The height direction of the paper is determined in advance by a scale 63 carved in the paper guide 45 and a convex portion 64 provided on the paper guide 45.
Next, the upper roller 14 of the paper sent from the conveyance section
In order to determine the approach angle to the lower roller 15, it is necessary to make a final angle adjustment (fine adjustment) of the paper guide 45. Since the paper guide 45 and the paper guide support member 61 are fixed with screws 62,
Opening hole 65 provided in paper guide support member 61
By attaching a screw 66 to and rotating the screw 66, the angle of the paper guide 45 can be freely changed and an appropriate value can be selected. Note that the lower end of the screw 66 is in contact with the upper surface of a flange 67 provided on the frame 3 (FIG. 7; first position). In the embodiment of the present invention, the guide member is provided with a screw, but the frame 3 may be provided with a screw and the guide member may be provided with a flange.

On the other hand, to change the angle of the paper guide 45 for cardboard (postcards), the solenoid 59 is turned on when the postcard size is detected, and the shaft 68 of the solenoid 59 is pulled. Pin 7 on shaft 68
3, a lever 69 is attached, and an arm 70 of the lever 69 pushes up a convex portion 71 provided on the paper guide support member 61 (FIG. 8; second position). Since the angle of the paper guide 45 changes (the paper guide 45 is urged to rotate in the same direction as the rotational direction of the lower roller 15), the entrance angle of the paper can also be changed, and stable paper feeding becomes possible.

Note that when the solenoid 59 is turned off, the state shown in FIG. 7 is restored by an elastic member that urges the shaft 74 to rotate in the same direction as the rotational direction of the upper roller 14.

(g) Effects of the invention As is clear from the above description, the invention includes an elastic lever that rotatably fixes the oil supply member;
The oil supply member is configured to include a locking means for locking the oil supply member in pressure contact with a roller near a free end of the elastic lever, and a holding means for removably holding a pivot point of the elastic lever. This ensures that the rollers are always completely coated with oil and that toner adhering to the rollers can be completely removed. Moreover, the mechanism around the oil supply member is simple, and operations such as replacement can be easily performed.

[Brief explanation of the drawing]

Each drawing is an example of the present invention, and the first
The figure is a partial perspective view of the front side, Figure 2 is a partial exploded perspective view of the front side, Figure 3 is a sectional view, Figure 4 is a partial side view of the front side, and Figure 5 is an exploded perspective view of the vicinity of the elastic lever. , Figure 6 is a perspective view, Figures 7 and 8.
The figure is a partial sectional view, and FIG. 9 is an exploded perspective view of the solenoid. 1... Bottom plate, 3... Frame, 9...
... Lever, 14 ... Upper roller, 15 ... Lower roller, 17, 18 ... Shift frame, 28 ... Plate, 33 ... Photo micro sensor, 39 ...
... Spring (elastic member), 44 ... Screw, 45
...Paper guide, 56...Sensor lever, 59
... Solenoid, 61 ... Paper guide support member, 66 ... Screw, 67 ... Flange, 74 ... Shaft (holding means), 75 ... Elastic lever, 76 ...
... Notch, 80 ... Oil supply member (oil feed roller), 83 ... Pin (locking means).

Claims (1)

[Claims for Utility Model Registration] An upper roller and a lower roller that rotate while being pressed against each other are provided, and a recording paper on which an unfixed toner image is formed is inserted between the upper roller and the lower roller to remove the unfixed toner image. A fixing device for fixing an image includes: an oil supply member provided on at least one of the upper roller and the lower roller in pressure contact with the roller surface; and an elastic lever that rotatably holds the oil supply member. , a locking means for locking the vicinity of the free end of the elastic lever with the oil supply member in pressure contact with the roller, and a holding means for holding the rotational fulcrum of the elastic lever together with the locking by the locking means. A fixing device comprising the following: When the lock of the locking means is released, the rotation fulcrum of the elastic lever can be freely attached to and removed from the holding means.