JPS59174869A - Fixing device - Google Patents

Abstract

PURPOSE:To remove jamming paper easily in safety by supporting a separating pawl turnably within a specified range to some part of a heat insulation cover which is supported turnably while its maximum rotation range is limited, and energizing the pawl in such a direction that it contacts a heat roller. CONSTITUTION:If recording paper jams between the front edge 9a of the separating pawl 9 and the peripheral surface of the heat roller 6, a unit 45 is drawn out and the heat insulation cover 22 is lifted after the cover 49 of an inverting device 30 to turn both movable parts 24b and 23b. Consequently, the separating pawl 9 supported by the movable part 23b also turns and its front edge 9a leaves the heat roller 6 to remove the jamming paper easily. In this case, the turning ranges of both movable parts are limited by allowing the projection 63 of the movable part 23b to abut on a stopper 52, preventing the danger of burn, etc. Further, the turning range of the separating pawl 9 is limited by allowing the projection part 9b of the separating pawl to abut on a stopper 65 to prevent trouble such over turning. Thus, the removal of jamming paper is performed easily in safety.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method of passing a recording paper carrying a toner image between a heating roller and a pressure roller that are in rolling contact with each other. When the recording paper adheres to the heating roller during snacking between the heating roller and the pressure roller, it can come into contact with the heating roller and be peeled off from the heating roller by at least one peeling claw. The present invention relates to a P fixing device configured as shown in FIG.

BACKGROUND OF THE INVENTION Fixing devices of the above type employed in various recording apparatuses such as electronic copying machines, electrostatic recording apparatuses, and printers are well known. The recording paper passes through this fixing device as described above, but the recording paper is caught between the heating roller and the tip of the peeling claw, causing the recording paper to become jammed. It is difficult to completely avoid this problem G1°.Therefore, when a recording paper conveyance trouble occurs, it is necessary to construct a structure in which the jammed left recording paper, that is, the jammed paper can be easily removed. From this point of view, various configurations have been proposed and put into practical use. for example,
direction 1/(r) in which the peeling claw is moved away from the heating roller together with the nearby members;
It is known to be constructed so that the recording paper can be easily removed from between the peeling claw and the peeling claw. However, in this conventional configuration, the sharp tip of the retractable peeling claw is exposed to the outside of the fixing device, so the operator can easily remove jammed paper. When removing, touch the tip of the peeling nail 1,
There is a risk of injuring your hands. In order to eliminate this drawback, it is known that when retracting from the peeling nail sound heating roller, the tip of the peeling claw is oriented downward so that r = tt, and Ql is configured so that this 71 is not exposed. This type of fixing device avoids the drawbacks of complicated structure and increased cost.
none·. A structure has also been proposed in which the peeling claw is retracted from the heating roller together with the heat insulating cover when trouble occurs in transporting the recording paper, but even if this is done, the above-mentioned drawbacks cannot be avoided. Not only that, by opening the heat insulating cover, the heating roller heated to a high temperature will be exposed to a large extent, and there is a risk that the operator will accidentally get burns on all of his hands when touching the nVC. 1. When a recording paper conveyance problem occurs, the cc1 peeling claw is evacuated from the heating roller along with the members near 7? According to the above-mentioned configuration, in order to eliminate the inconvenience of the retracting peeling claw interfering with the heat insulating cover, it is necessary to make a fairly large cut in a portion of the heat insulating cover. There is no drawback that the insulation effect decreases due to the holes.

Purpose The present invention is based on the above recognition.1. The purpose of this system is to provide a fixing system that allows operators to easily remove jammed paper without causing any danger or stress as in the case of conventional methods, and that can also reduce a significant increase in costs. By providing the equipment.

Embodiment The fixing device according to the present invention can be employed in various types of notation devices. An embodiment in which all of the fixing devices according to the invention are adopted will be described with reference to the drawings.

In FIG. 1, 1 is a photosensitive drum;
At this time, a toner image made of toner is formed on the surface of the drum 1 by a latent image forming device and a developing device (not shown). This toner image is fed onto the surface of the photoreceptor drum 1 and placed on the recording paper 2. - After forming the transfer hole, the recording paper 2 is separated from the photoreceptor drum 1 by a lever 91, conveyed in the direction of the arrow by the conveyor belt 3 7''1., and fed into the fixing device 4 by the groove A9. .

The photosensitive drum portion after the toner image transfer reaches a cleaning device 5 as the drum rotates, where the toner remaining on the drum surface is cleaned away.

The fixing device 4 includes a heating roller 6 that extends perpendicularly to the paper surface.
and pressure rollers 7 and 2 that form a pair with the roller 6 and roll into contact with each other while being pressed against each other, and the inside of the heating roller 6 [
The heater 8 is housed at 37"'t, and the heating roller 6 is heated by the VC. In the example shown in the figure, the pressure roller 27vC is □
Although no heater is provided, the pressure roller 7 may also be provided with a heater to directly heat the pressure roller.

The heating roller 6 is rotated in the counterclockwise direction V (n1) by the (1) driving device as shown in the figure, and the pressure roller 7 is rotated in the clockwise direction. "1. The left recording paper 2 is fed between the heating roller 6 and the pressure roller 7 and passes between both rollers. At this time, the toner image on the recording paper 2 is mainly heated by the heater 8vc. The image is fixed onto the recording paper by the heat from the heating roller 6.

When the leading edge of the recording paper adheres to the heating roller 6 due to the separation between the heating roller 6 and the pressure roller 7, one or more peeling claws 9vC, which will be explained in detail later, cause the recording paper to be attached to the heating roller 6. When the leading edge of the recording paper 2 is in close contact with the circumferential surface of the pressure roller 7, the peeling awn is removed from the pressure roller 7 by the lower peeling claw 10Vc in contact with the pressure roller. ηru. In this way, the recording paper 7 is ejected from the fixing device 4. The conveyance rollers 13 and 14Vr rotate in the direction shown by the arrow while being guided by the upper guide plate 11 and the lower guide plate 12. receive.

15 is a thermistor that detects the temperature of the heating roller 6; 16 is a heating roller 26; a roller cleaning blade that cleans toner attached to VC; 17 is a roller cleaning blade that cleans the toner attached to the heating roller 26; Coating felt to be applied to the circumferential surface, Se 19 is coating huff 1. This is a metering blade that evens out the mold release agent. 'f
7. 20 indicates a cleaning roller that cleans the circumferential surface 2 of the pressure roller 7, and 21 indicates an oil pan that receives the mold release agent 2 for dropping iJ drops, and these are all well-known elements. Detailed explanation of f and 7 will be omitted.

The heating roller 66 is heated to a high temperature by the heater 8, but if that heat is released to the outside of the fixing device for IS, not only will heat be lost, but it will also damage the elements around the fixing device. Since there is a risk of adverse effects caused by heat, at least a portion of the area around the heating roller, in the example shown above the area above the heating roller 6, is covered by the heat insulating cover 221.

This heat insulating cover may have a single layer structure using one heat insulating material, or may have a multilayer structure using a plurality of heat insulating materials (1).

In the illustrated f-grid, the first insulation material 23 and the second insulation material 24
The heat insulating cover 222 is formed into a double structure.

Also, in the direction perpendicular to the plane of the paper in FIG.
In FIG. 1, only one side plate is shown). Therefore, the upper region of the heating roller 6 is surrounded by the first heat insulating material 23 and the side plates 25 at rt, 1. Kamo 1st and 2nd
An air flow passage 26 is defined by the heat insulating material 23, 24 and the side plates 25. Air flows into the air flow passage 26 from the air inlets 28, 32, and the air flows through the air inlets 28, 32 formed in the side plates 25. nT: Air flows out from the air outlet 29. The heat insulating effect of the heat insulating cover 22 is enhanced by flowing VC2 air.A blower (not shown) may be connected to the air outlet 29 to forcibly suck the air in the air flow passage 26. It is preferable that the side plate 25 is also made of a heat insulating material.

In the illustrated embodiment, the recording paper reversing device 30 is configured to control the feeding direction of the recording paper 2 from the four fixing devices. Although this reversing device 30 is not an essential component of the present invention, the configuration and operation of this device 3o will be briefly explained in order to understand the present invention.

In Fig. 1, 33 is a clockwise rotation drive roller, and 34.35 is a clockwise rotation drive roller, and 34.35 is a counterclockwise rotation drive roller that is not paired with the drive roller 33. This is a second movable roller.

Recording paper coming out of fixing device 4? When it is to be discharged outside the machine, the first and second movable rollers 34 and 35 are brought to the positions shown by solid lines in the figure. This waste recording paper 2 is conveyed in the direction of arrow B while being held between both movable rollers 34, 35 and the drive roller 33, and is conveyed to the upper and lower guide plates 36.3.
7, and a guide n on the upper end guide surface of the movable guide member 38.
Paper ejection rollers 39 and 40 [Therefore, there are ejection holes to the stacker 41 outside the machine.

For the purpose of aligning the order of the recording sheets stacked on the stacker 41VC, the first and second movable rollers 34 and 35 are separated from each other when the recording sheets are to be reversed and discharged outside the machine. Activate it in the direction, here? Also move π to the position shown by the chain line in FIG. At the same time, 71. The movable guide plate 42, which was in the position shown by the solid line, is moved to the position shown by the chain line. Therefore, when the leading edge of the recording paper 2 reaches the reversing device 3o,
The recording paper is placed on the movable guide plate 42 [when the guide is created, the first movable roller 34 and the fifth drive roller 3 have moved to the position indicated by the chain line.
3, the hole is sent upward as shown by arrow C. In this case, the recording paper is placed between the two upper guide plates 1 mentioned above.
1.36 [The connection to the eyebrows is 7″lK kite plate
The guide plates 11a and 36a of the guide plates 11a and 36a guided by the guide plates 11a and 36a are provided with a pair of feed-back rollers 43 at n. When the trailing edge of the recording paper separates 717 from the movable guide plate 42, the feed-back pair 70-ra pair 43, which had been separated from each other until then, approaches each other as shown by the chain line, and the stiffener rotates π in the direction shown by the arrow. By,
The recording paper is returned in the direction opposite to the arrow C (7L), is held between the second movable roller 35 and the drive roller 33, and is guided through the guide surface of the movable guide member 38 and the upper and lower guide plates 36 and 37, and then inserted into the machine. Exhaust type outside. The ejected recording paper is reversed and becomes 1/1.

When the pair of feed-back rollers 43 approach each other and the recording paper is returned, the movable guide member 38 is moved to the position f shown by the chain line. n
The recording paper is fed downward to the photoreceptor drum 1 again, and the toner image is transferred again to the surface opposite to the surface on which the toner image was previously transferred. The toner image is fixed by the fixing device 4. In this way, upper layer toner images are formed on both sides of the recording paper.

-11 If the movable guide member 38 is rotated to the position indicated by the chain line and the first and second movable rollers 34 and 35 are also set to the position indicated by the solid line, the recording paper 2 that has come out of the fixing device 4 can be fixed. of,
It can be fed directly to the guide plate 44 below. Next, this recording paper is fed to the photoreceptor drum 1 again (717), and a toner image is formed first? During transfer, a new toner image is created on the same surface as the n, ;r= surface? Can a toner image be formed on one side of the recording paper? It can be formed by synthesis.

The fixing of the toner image on the recording paper and the transportation of the recording paper are performed as described above 71-, but while the recording paper is being transported, the heating roller 6 of the fixing device 4 and the peeling claw 9 that are in pressure contact with the heating roller 6 of the fixing device 4 are If the recording paper becomes jammed between the two, the structure according to the present invention, which will be described in detail below, allows the jammed recording paper to be easily removed. Further, in this example, a recording paper reversing device 30 is not provided.
However, this device 30 is constructed so that even one recording paper can be easily removed, and the construction related to this will be explained below.

In the single copying machine shown in FIG. 1, the fixing device 4 and recording paper reversing device 30 form an integral unit 45, as shown enclosed by a chain line, and this unit 45 can be pulled out from the main body of the copying machine. It has become.

That is, a guide rail 47 is fixed to the support 46 of the unit 45, and this guide rail 47 is fixed to the copying machine main body side along the fixed guide rail 48. The support hole is slidable in the direction perpendicular to the plane of the drawing, and the entire unit 45 is
It can be pulled out from the copying machine body toward the front of the page in the figure. In this way, the fixing device 4 and the reversing device 30 can be pulled out as a unit, so that when jammed paper straddles the barrel devices 4 and 30 and stops, it is possible to remove the paper from one side or the other. This is because if the device 4 or 30 is pulled out, the jammed paper may be damaged and it may become difficult to remove the jammed paper 71. Already mentioned rollers] 3, 34, 35
, 43 and the guide plate 11. , 11a, 36,
36 a is the side plate 49 of the cover 49 that covers the reversing device 30;
This cover 49 is supported by a, as shown in FIG.
The roller 39 is configured to be rotatable around the prongs ql 139a. Therefore, after pulling out the unit 45 as described above, opening the cover 49 as shown in FIG.
Papers stuck in the recording paper reversing device 30 can be easily taken out one by one.On the other hand, according to the present invention, at least a portion of the heat insulating cover in the fixing device can be rotated . In this example, the first and second heat insulators 23 and 24 are divided into fixed parts 23a and 24a and movable parts 23b and 24b. Part 23
a is rotatably supported by a hinge 50, and both rotating parts 23b.

24b is constructed so as to be able to rotate integrally with respect to the fixed parts 23a and 24a.In the illustrated example, the side plate 25 does not rotate and is fixed immovably. The side plates r1 located on both sides of the cover 22 may be configured as separate members from the side plates of the entire fixing device, and the side plates on the sides of the heat insulating cover can be rotated together with the movable parts 231) and 24b. , 53.54 is the fixed part 23a
, 24a and the movable parts 23b, 24b.
is made of a flexible material such as sponge so as not to inhibit the movement of the movable parts 23b and 24b.

As explained earlier (7), the peeling claws 9 are rotatably supported on the rotating part of the heat insulating cover 22. In this example, the peeling claws 9 are attached to each lateral end of the movable part 23b of the first heat insulating material 23K. The bracket 60 is fixedly mounted on a rock.

One or more peeling claws 9 are rotatably supported 71 on a support shaft 61 fixed to the bracket 60.

A tension spring 62 is attached to the first heat insulating material 23 and the peeling claw 9.
The peeling claw 9 has a locking groove at each end, and the peeling claw 9 is given a rotating habit in the opening direction by the locking groove ``L'', and the peeling claw 9 is biased σn1 in the direction in which its tip 9a contacts the heating roller 6. The tip 9a of this is in pressure contact with the heating roller 6, and as described above, it is used to peel the recording paper from the heating roller 6.The peeling claw 9?A suitable means other than the tension spring 62 is used as a biasing means. It can also be adopted.

When the recording paper becomes jammed between the tip 9a of the peeling claw 9 and the circumferential surface of the heat roller 6, the unit 45 is pulled out as described above, and the cover 49 covering the reversing device 30i is removed as shown in FIG. After opening the mouth, put your hand on the handle 51 attached to the movable part 24b of the second heat insulating material 24 at a suitable place on the heat insulating cover 22, in this example, lift it upward, and then press both rotating parts 24b, 23
b-(H) The amount of rotation shown in Fig. 2 can be made.
The rLP peeling claw Q is also supported by the movable part 23'b.
, 24b, and its tip 9a separates from the heating roller 6). As a result, the jammed paper (not shown) that has been wedged between the tip 9a of the peeling claw 9 and the circumferential surface of the heating roller 6 is released, and the operator can see the relatively Jam paper can be easily taken out from a large space. In this case, the movable parts 23b and 24b of the heat insulating cover 22 rotate and the peeling claw 9 is biased clockwise by the tension spring 62, so that its sharp tip 9a is exposed to the outside of the fixing load. It is not exposed towards the front, but faces inward and extends up to about f. Therefore, there is virtually no hole where the operator touches the tip 9a of the peeling claw 9, and the disadvantage 2 of injuring the operator's fingers can be eliminated.

If the opening angle of the P movable parts 23b and 24b is too wide, the heating roller 6 will be exposed to the outside of the fixing device 4, and the operator may get burns when touching the high-temperature heating roller 6i/i'. However, in this example, a side plate 25 vci 1 stopper 52 is provided so that the protrusion 63 of the movable part 23b can come into contact with this stopper 52, and the movable part 23b, 2.4'Lb Maximum rotation range? The structure is such that the movable part does not open too widely. If the maximum rotation amount of the movable parts 231) and 24b is too small, it will be difficult to remove the jammed paper.
The maximum rotation amount i of the Oishi lever should be set in consideration of this point.0 Furthermore, since the heat insulating cover 22 itself has heat insulating properties, the outer second heat insulating material 24 No inconveniences such as burns will occur.

When the jammed paper removal operation is completed fJ, when the hand is released from the handle 51, both rotating parts 23b and 24b return to the normal closed position shown in FIG. 1 by their own weight. In this way, in this example, the movable parts 23b, 24b return to the closed position by their own weight, so there is no problem of forgetting to close the movable parts 23b, 124bi. In this case, do not disturb the progress of the recording paper.
The positioning member 64 is immovably fixed at one position, and the movable part 23
b, 24b return to the closed position shown in FIG. . A spring (not shown) is provided to bias the movable parts 23b and 24bi toward the closed position.
It is also advantageous to provide a configuration in which both parts b and 24b can be returned to the closed position more reliably.

When the movable parts 23b, 24b'z are opened from the closed position and the tip 9a of the peeling claw 9 is separated from the heating roller 6, the separating claw 9 is pulled by the tension spring 62F, but this tensile force If the peeling claw 9 rotates too much, the movable part 23b
, 24b'z When reset to the closed position, the tip 9a of the peeling claw 9 interferes with the heating roller 61/C, and the movable part 23b
, 24bi cannot be reset, so in this example, 65 second stoppers are provided on the movable part 23b of the first heat insulating material 23, and the movable part 23b.

24b'z open Q again, this stopper 65 has a peeling claw 9
The abutment of the protrusion 9bi (FIG. 2) restricts the range of rotation of the peeling claw 90, thereby preventing the inconvenience of the mounting 9 from rotating significantly. In this case, by appropriately setting the position or shape of the second stopper 65 as necessary, the movable parts 23b, 2
4b is opened, it is also possible to configure the tip 9a of the peeling claw 9 to be 7"I away from the same surface of the heating roller 6. When the lower peeling claw 10 in pressure contact with the pressure roller can also be rotated from its closed position to its open position, the cover 49 is shown in FIG. When opening to the open position, at the same time as this operation, the paper 9 is separated from the edge pressure roller 7, and any jammed paper caught between the peeling claw 10 and the pressure roller 7 is removed.

ing. 11C In this example, the configuration is such that the pressure roller 7 and heating roller 6 are released from the pressed state not only when the copying machine is stopped or on standby, but also when removing jammed paper.
In the embodiment shown in FIGS. 1 and 2, the heat insulating cover 22
The movable parts 23b and 24bi are kept in the open state by constantly holding them down with fingers or the like, so that they cannot be moved. In the embodiment shown in FIGS. 3 and 4, in order to avoid this complicated procedure, one end 66ak of the leaf spring 66 is attached to the movable part 23b of the first heat insulating material 23 instead of the protrusion 63 shown in FIG.
Fixed and insulated cup-22 movable parts 2.3b, 24bk
When it can be rotated from the closed position shown in FIG. 3 to the open position shown in FIG.
In addition to the two plate springs 66, the stopper 52 is attached to the plate spring 66C.
) It is constructed so that the center part can be overcome. With this configuration f, when the movable parts 23b, 24b (z) are brought to the fully open position 1 shown in FIG. Since they are in contact with each other, the movable parts 23b and 24bG are held in the fully open position.To return the movable part to the fully open position shown in FIG. 6
6 is deformed and moves over the leaf spring 66 again, and the movable parts 23b and 24b can be returned to the closed position shown in FIG. As you can see, the force %-49 [pressing member 67 (
4) is fixed and rotated from the fully open position with a force of <-49 to the position shown by the chain line in FIG. It is advantageous to provide automatic pivoting into its fully closed position.

Although the preferred embodiments of the present invention have been described above, the present invention can be embodied by making various modifications to the above-mentioned configuration. Alternatively, instead of making only a part of the heat insulating cover (the movable part in the illustrated embodiment) rotatable, the entire heat insulating cover may be held rotatably. 11. The first stopper and the second stopper according to the present invention can also adopt any suitable type of stopper other than the illustrated form.0 Effect: The present invention supports at least a portion of the heat insulating cover so as to be rotatable. together with a first part that limits the maximum rotation range of the cover.
a stopper is provided, the peeling claw is rotatably held on a portion of the rotating heat insulating cover, and urging means is configured to urge the peeling claw in a direction in which the tip of the peeling claw comes into contact with the folds of the heating roller vC; The first stopper that regulates the rotation range of the claw? Because of the structure, it is possible to easily remove all the paper jammed between the heating roller and the peeling claw, but there is no inconvenience that the operator may injure his or her fingers with the tip of the peeling claw. It can be suppressed.

Moreover, the high-temperature heating roller [therefore, the drawback of causing burns can be reduced. It is also possible to eliminate the need to make a large notch in the heat insulating cover for the purpose of retracting and removing the peeling claw, as was the case with the conventional configuration, and the reduction in the heat insulating effect of the heat insulating cover can be suppressed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing only a part of an electronic copying machine equipped with a fixing device according to the present invention, FIG. 2 is a partial cross-sectional view showing the state when removing jammed recording paper, and FIG. FIG. 4 is a partial cross-sectional view similar to FIG. 1 showing another embodiment, and FIG. 4 is a partial cross-sectional view showing the entire state similar to FIG. 2 in the embodiment shown in FIG. 3. 2... Recording paper 4... Fixing device 6...
Heating roller 7...Pressure roller 9...Peeling claw 22...Insulating cover 52...First stopper 65...Second stopper agent Patent attorney
Norio Hoshino e Procedural amendment (voluntary) April 30, 1980 Mr. Kazuo Wakasugi, Commissioner of the Japan Patent Office 1 Display of case 1989 Patent Application No. 49530 2 Name fixing device of invention 3 Amendment? Relationship with the case of the person who filed the patent application Address of the patent applicant: 1-3-6 Nakamagome, Ota-ku, Tokyo Name (67
4) Ricoh Co., Ltd. 4th Director General 105 Address 1-9-9 Nishi-Shinbashi, Minato-ku, Tokyo Contents of 6th amendment (1) “Recording paper” from line 3 from the bottom of page 10 to line 2 from page 11 of the specification . . . In some cases, the rollers 43a and 43bi of the pair of feed-back rollers 43 are supported in a supporting manner so as to be able to approach and separate from each other, and the roller 43a on the fixed side is rotationally driven in the direction of reversing the recording paper. Roller 43b on the movable side
6 is rotatable, and when this 717 comes into contact with Q and Q through the recording paper R, and when fJ, the recording paper moves backwards. let When the trailing edge of the recording paper passes through the nip, which is composed of the drive roller 33 and the first movable roller 34, the rollers 43a and 43b of the return roller pair 43 are
contacts the recording paper, and the movable guide plate 42 retreats to the position shown by the solid line. ○ (2) On page 1, line 17 of the same il, after “Ashi h-,” vt-
"Retract to the position of the movable guide plate 42 and insert it." (3) Correct as shown in the attached sheet in Figure 1.

Claims (1)

[Claims] The toner image 2 is fixed on the recording paper by passing the recording paper carrying the toner image between the heating roller and the pressure roller that are in rolling contact with each other, and the toner image 2 is fixed on the recording paper between the heating roller and the pressure roller. When the recording paper that has passed through the heating roller adheres to the heating roller, the recording paper is configured such that it can be peeled off from the heating roller by at least one peeling claw rC in contact with the heating roller, and at least a part of the periphery of the heating roller is
The fixing load G1 covered by the heat insulating cover is provided with a second stopper that rotatably supports at least a portion of the heat insulating cover and limits the maximum rotation range of the cover, and a rotatable heat insulating cover. The peeling claw 7 is rotatably supported in one part, and the tip of the peeling claw is in contact with the heating roller.
A biasing means for biasing the peeling claw and a second stopper for regulating the rotation range of the peeling claw are provided. The fixing device characterized by: