JPS60200274A - Pressure fixing device - Google Patents

Abstract

PURPOSE:To easily attach and detach a cleaning member by forming a groove which guides a support shaft extending from above a hole to the upper end of a support member in the support member. CONSTITUTION:A hole 21 for receiving a pin 18 is formed in the surface opposite the lengthwise end surface of the cleaner frame 12 of a side plate 4, and the groove 22 for guiding the pin 18 toward the top end of the side plate 4 is formed above the groove 21. Similarly, a hole 21' for receiving a pin 18 is formed in the lengthwise end surface of the cleaner frame 12 of a side plate 4', and a groove 22' for guiding the pin 19 is also formed. Therefore, when the cleaning member 11 is fitted to the side plates 4 and 4', the pins 18 and 19 are slid in the grooves 22 and 22' and lowered to the inner parts of the grooves; and then the pin is pressed against the side plate 4 while inserting into the hole 21 and the pin 19 is inserted into the hole 21', thereby holding the member 11 between the side plates 4 and 4' with the restoring force of a compression spring 20. The member 11 is detached according to the reverse procedure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a pressure fixing device in which a support carrying a toner image is passed between a pair of fixing rolls and fixed only by pressure.

[Prior art]

In image forming devices such as electrophotographic devices and electrostatic recording devices, for example, a pressure fixing device is used to fix a toner image held on a support such as paper or a plastic sheet after development or transfer. ing. There are various structures for this pressure fixing device, but for example, the
One equipped with a pair of fixing rolls as described in Japanese Patent Publication No. 7751 or, for example, Japanese Patent Publication No. 55-4851.
A roller having three rolls as described in Japanese Patent No. 5 is common.

In this type of pressure fixing device, pressure is applied (usually 1
Linear pressure of about 9/α from 0 to 25) In order to compensate for the deflection between the pair of fixing rolls and obtain a uniform pressure distribution in the axial direction,
For example, Japanese Patent Publication No. 55-6911 and Japanese Unexamined Patent Publication No. 55-1989
As described in Japanese Patent No. 4075, it is common practice to have the axes of the pair of rolls intersect.

In addition, in a normal pressure fixing device, in order to prevent the offset phenomenon, the surface of the fixing plate is plated with hard chrome and then polished to make it thinner (0.3 to 0.0 mm).
8S) is provided with a cleaning member for removing toner adhering to the roll surface. As this cleaning member, one in which felt is mounted in a frame is known, for example, as described in Japanese Utility Model Publication No. 54-40026. However, when using felt alone, after copying multiple plates, toner accumulates between the roll surface and the felt surface that is in contact with the surface, and not only does the cleaning effect of the felt become ineffective, but also the accumulated toner is deposited on the roll surface. reattached,
On the contrary, the result is that the image becomes dirty.

Therefore, as described in, for example, Japanese Unexamined Patent Publication No. 111959-18974, a cleaning member is used in which a scraping plate is provided in front of the cleaner felt in the rotational direction of the roll.

In order to eliminate the above-mentioned problems with this cleaning member, it is necessary to periodically remove the cleaning member and replace the felt. Particularly in pressure fixing devices used in printers, replacement is frequently required, so cleaning It is required that the members can be easily attached and detached. However, although the structure described in JP-A-59-18974 has the advantage that the cleaning member can be easily removed, it has the disadvantage that it takes time and effort to attach the cleaning member. [Object] An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a pressure fixing device in which the IJ-ning member can be easily attached and detached.

[Summary]

The pressure fixing device of the present invention includes at least a pair of fixing rolls that are in pressure contact with each other, a pair of support members that rotatably support the fixing rolls, and a scraper whose tip is in contact with the outer peripheral surface of one of the fixing rolls. A pressure fixing device comprising: a cleaning member having a support shaft protruding from both ends of a frame that holds a plate and a band-shaped member in contact with the outer circumferential surface of the fixing plate; and a hole for receiving the support shaft is provided in the support member. The support member is characterized in that a groove for guiding the support shaft is provided in the support member, extending from above the hole toward the upper end of the support member.

〔Example〕

The details of the present invention will be explained below with reference to the drawings.

FIG. 1 is a plan view of a pressure fixing device according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line A-A in FIG. 1 (however, it is enlarged).
, FIG. 5 is a plan view of the cleaning member in FIG.
(However, the scraping plate is omitted), 4rgJ is a cross-sectional view taken along line B-B in Figure 3 (but enlarged), Figure 5 (, yj is a cross-sectional view taken along line C-C in Figure 1 (but enlarged), ), FIG. 6 is a view taken along the line DD in FIG. 5, and FIG. 7 is a view taken along the line EE in FIG.

First, in FIGS. 1 and 2, the fixing roll 1 is rotatably supported on the side plate 4.4' via a bearing (not shown), and the fixing roll 2 is freely movable up and down within the side plate 4.4'. The pressure roll 3 is supported via a bearing (not shown) on a guide plate 5 mounted on the side plate 4. is supported through. Are there four springs between the guide plate 6 and the side plate 4.4'? A washer 8.8' is interposed, and the upper end of a pressure bolt 9 screwed onto the side plate 4.4' is in contact with the lower surface of the washer 8'.

Therefore, by appropriately tightening the pressure port 9, the fixing rolls 1 and 2 and the fixing roll 2 and the pressure roll 3 can be brought into pressure contact with each other with a predetermined pressure.

Further, in the drawings, 10 is a stay, 11 is a cleaning member, 25 is a toner image, and 26 is a support holding the toner image 251, respectively.

Next, the structure of the cleaning member is shown in FIGS. 1 to 4.
This will be explained using figures.

Reference numeral 12 designates a cleaner frame, on the top surface of which a toner storage groove 13 having a triangular cross section is formed, and at the bottom of the groove 15 a scraping plate 14 whose tip is in contact with the surface of the fixing reel 1 is fixed with a screw 15. There is. Further, a groove 16 is formed in the surface of the cleaner frame 12 facing the fixing reel 1 along the axial direction of the roll.
A felt 17 is held in contact with the surface. Further, pins 18 and 19 are fixed to both longitudinal end surfaces of the cleaner frame 12, and one of the pins 18 is fitted with a compression coil spring 20.

Next, a method for attaching and detaching the cleaning member will be explained with reference to FIGS. 5 to 7.

First, a hole 21 having a depth greater than the length of the pin 1B for receiving the pin 1B is formed on the surface of the side plate 4 facing the longitudinal end surface of the cleaner frame 12.
A groove 22 for guiding the pin 18 toward the upper end of the side plate 4 is formed above. Similarly, a hole 21' for receiving the pin 19 is formed on the longitudinal end surface of the cleaner frame 12 of the side plate J/, and above the hole 21', the pin 19 is guided toward the upper end of the side plate 4'. A groove 22' is formed for this purpose.

Therefore, when attaching the cleaning member 11 to the side plate 4.4', first
9 into the grooves 22 and 22', respectively, and are lowered to the depths of the grooves (see dashed lines in FIG. 5).

Next, the pin 18 is inserted into the hole 21 and pressed against the side plate 4 (compressing the compression coil spring 20), and then the pin 19 is inserted into the hole 21' and the pressing force is released, so that the restoring force of the compression coil spring 20 Cleaning member 1
1 is stably held between the side plates 4, 4'. On the other hand, when removing the cleaning member 11 from the side plate 4.41, press the cleaning member 11 toward the side plate 4 and press the pin 19.
is taken out from the hole 21' and placed in the groove 22/, and then the pin 18 is
All you have to do is take it out of the hole 21, place it in the groove 22, and then pull it upward.

According to the configuration according to the present invention as described above, by providing specific grooves 22 and 227 in the side plates 4 and 4', respectively, the cleaning member can be installed from above with one touch, and can be removed. It is also extremely easy. The depth of the grooves 22.22' and the holes 21.21' and the length of the cleaner frame 11 are set appropriately so that the above-mentioned operations can be performed smoothly (specifically, the depths of the grooves 22.22' and the holes 21.21' are
> 16 > 12), but
For smooth operation, the depth of the hole 21 is preferably larger than that of the hole 21'.

In addition, if protrusions 23 and 23' of appropriate height are provided below the holes 21 and 21', as shown in No. 5ryJ, it will be effective to prevent the pin from falling during the above operation, and the work efficiency will be greatly improved. can be improved.

Furthermore, in the present invention, in addition to the above-mentioned configuration, a scraping plate 14 is provided.
(7) Cho'i! It is also possible to set lB to be the same as or larger than the length zr of the body of the fixing roll 1 (js≧lr). With such a configuration, it is possible to prevent toner from falling from both ends of the toner storage groove 15 of the cleaning member 11.

Furthermore, when attaching the scraping plate 14 to the cleaner frame 12, by attaching the presser plate 27 to the screws 15, it is possible to prevent the scraping plate from warping and toner storage groove 1S.
By installing the cuckoo 24 above the fixing roll 1, it is possible to prevent toner from scattering. By bending the other end of the guide bar 24 into an arc shape and locking it to the stay 10 installed between the side plates 4 and 4', the cover 24
It is easy to attach and detach.

In the above embodiment, a three-roll type pressure fixing system was explained; however, the present invention is not limited to this, but can also be applied to a two-roll type or four or more roll type pressure fixing device. Of course it is possible.

〔effect〕

As described above, according to the pressure fixing device according to the present invention, by providing a specific groove in the side plate, the cleaning member can be attached and detached extremely easily, which is an excellent practical effect. If necessary, toner can be prevented from falling by making the length of the scraping plate longer than that of the fixing roll, and also by making the length of the scraping plate longer than that of the fixing roll.
- By setting the number of toners, it is possible to obtain the effect of increasing the toner storage capacity and preventing toner scattering.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a pressure fixing device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. Figure 4 is the third
Figure 5 is a sectional view taken along line C-C in Figure 1, Figure 6 is a view taken along line D-D in Figure 5, and Figure 7 is taken along line E-B in Figure 5.
It is an arrow view. 1.2: Fixing roll, 3: Pressure roll, 4.4:
@Plate, 11: Cleaning member, 12: Cleaner frame, 15: ) Gner storage groove, 14: Scraping plate, 1
7: Felt, 1B, 19: Pin, 20: Compression coil spring, 21.
21': Hole, 22.22': Groove, 24: Cleaner cover, 27: Holding plate.謬 3 Otsu 4n Habit 72 / Do 5r Kootsuguchi

Claims (1)

[Claims] 1. A pair of fixing rolls that are in pressure contact with each other, a pair of support members that rotatably support the fixing rolls, and a scraper whose tip is in contact with the outer peripheral surface of one of the fixing rolls. In a pressure fixing device, the cleaning member has a support shaft protruding from both ends of a frame that holds a cleaning blade and a strip member in contact with the outer peripheral surface of the fixing roll, and the support member is provided with a hole for receiving the support shaft. 2. A pressure fixing device characterized in that the supporting member is provided with a groove extending from above the hole toward the upper end of the supporting member and guiding the supporting shaft. 2. The length of the scraping plate is determined by adjusting the length of the fixing roll. The pressure fixing device according to claim 1, wherein the pressure fixing device is larger than the length.