JPS6041582Y2 - Blade holding device - Google Patents

Description

[Detailed explanation of the invention] This invention is based on the following method: After transferring the original toner image from the photoconductor to the copy paper,
The present invention relates to an improvement in a blade holding device that is included in a cleaning device that removes toner remaining on a photoreceptor and cleans the surface of the photoreceptor, and in particular holds a blade that slides into contact with the photoreceptor.

Conventionally, a cleaning device is configured as shown in FIG.

That is, the apparatus main body 1 is spaced from a photosensitive drum 3, which is a photosensitive member, by a predetermined distance via a spacer 2.

A recovery roller 4 is rotatably supported on the apparatus main body 1 and is in rolling contact with the photosensitive drum 3.

A blade holding device 5, which will be described later, is rotatably supported above the collection roller 4 by a rotating mechanism 6.

The rotation mechanism 6 elastically biases the tip of the blade 7 of the blade holding device 5 so as to come into pressure contact with the photosensitive drum 3.

Further, an auxiliary blade 8 is in rolling contact with the collection roller 4, and a transport 9 consisting of a screw shaft is rotatably supported on the inclined lower end side of the auxiliary blade 8.

An auxiliary collecting tool 10 is provided below the collecting roller 4 to catch falling toner.

The blade holding device 5 is constructed as shown in FIGS. 2 and 3, and 11 is a support plate bent to have a substantially doglegged cross section.

A recess 12 into which the end of the blade 7 fits is provided along the bent edge of the support plate 11.

Further, one end portion of the spring plate 13 is screwed onto the support body 11.

The other end of the spring plate 13 is bent to elastically press the blade 7 against the support plate 11.

The blade 7 scrapes off the toner remaining on the photosensitive drum 3, guides it to the transport 9 via the collection roller 4 and the auxiliary blade 8, and collects it at a predetermined location.

At this point, the blade 7 needs to be periodically removed and wiped off to prevent the scraped toner from forming a side cap on the leading edge.

When attaching and detaching the blade 7, each spring plate 13 must be rotated and held against elastic force.

However, it is extremely troublesome to maintain all the spring plates 13 in the same state.

Further, the force with which the spring plates 13... press the blade 7 varies depending on the tightening condition of the spring plate mounting screws 14....

For this reason, the blade 8 tends to have different distortions in parts,
The toner is scraped off unevenly, which is an obstacle to obtaining uniform and good image quality.

The present invention was made with attention to the above circumstances, and its purpose is to have a relatively simple structure, but to
It is an object of the present invention to provide a blade holding device which allows the blade to be attached and detached very easily and which holds the blade in a uniform state.

An embodiment of the present invention will be described below with reference to FIG. 4 and subsequent figures.

Reference numeral 20 denotes a support plate which is a support body, and is formed by connecting a horizontal piece 20a with an inclined piece 20b along the longitudinal direction, and has a substantially doglegged cross section.

A fixture 22 for gripping the support shaft 21 is fixed to one end of the horizontal piece 20a by means such as spot welding.

The support shaft 21 extends along the longitudinal direction of the horizontal piece 20a, and the presser claws 23 are rotatable at predetermined intervals.
and can be slidably fitted.

Each presser claw 23... is elastically biased by a presser spring 24... which is a coil-shaped torsion spring fitted to the support shaft 21 so that the claw portion 23a comes into contact with the inclined piece portion 20b. be done.

Note that these pressing springs 24 are slidable along the support shaft 21 together with the pressing claws 23 .

Further, the inclined piece portion 20b is provided with a groove 25 which is a fitting groove along the longitudinal direction.
Claw holes 26 communicating with 5 are bored at predetermined intervals on the inclined upper surface side.

The claw portions 23a of the presser claws 23 can be inserted into the claw holes 26 when the presser claws 23 are in opposing positions.

At this time, as shown in FIG. 6, the height L of the claw portion 23a is greater than the thickness T from the sloped upper surface of the inclined piece portion 20b to the groove 25, and the tip of the claw portion 23a is inserted into the groove 25. It will protrude by a dimension S.

One end of a blade 27 made of an elastic member is inserted into the groove 25 .

The claw portion 23a bites into this blade 27, and the blade 27
It is designed to hold elastically.

Therefore, when copying electronic copy paper, the blade 27 is moved to the claw portion 23a of the presser claw 23, as shown in FIG. 7A.
The toner remaining on the photosensitive drum is scraped off at its edge for cleaning.

The blade 27 must be removed from the support plate 20 during periodic inspection.

That is, the presser claw 23 is rotated against the biasing force of the spring 24, and the claw portion 23a is pulled up from the claw hole 26.

From this state, if you press the presser claw 23 together with the spring 24, the support shaft 2
Slide along 1.

If you release your hand when a part of the claw portion 23a is no longer facing the claw hole 26, the biasing force of the pressing spring 24 acts and the part shown in FIG. 7B is released.
As shown in FIG.
Touches the top surface.

By separating each presser pawl 23 from the blade 27 in this way, the blade 27 becomes free, and the concave groove 2
It can be easily removed from 5.

To hold the blade 27 on the support plate 20 again, insert one end of the blade 27 into the groove 25 and press each presser claw 23 in turn.
. . , and insert the claw portion 23a into the claw hole 26.

Since the claw portions 23a... all bite into the blade 27 by the dimension S, the holding force against the blade 27 and the strain caused by the holding are uniform, and as a result, the state of the blade 27 scraping off toner is also completely uniform. .

Although the presser spring 24 is slidable along the support shaft 21 together with the presser claw 23, the present invention is not limited to this, and only the presser claw 23 may be slidable.

Furthermore, although the pressing spring 24 is a coiled torsion spring, it may also be a plate spring, for example.

As explained above, according to the present invention, a blade fitting groove and a pawl hole are provided in a support body, a support shaft is attached to this support body, and a presser pawl is slidably and circumferentially mounted on this support body. Since it is elastically biased, the claw portion of the presser claw can be inserted into and removed from the claw hole, and each state can be maintained.

Therefore, by inserting the claw into the claw hole, the blade can be held elastically, and by pulling the claw out of the claw hole and sliding it in the axial direction of the spindle, this extracted state can be maintained, making it very easy to attach and remove the blade. This improves work efficiency.

Moreover, even if a plurality of presser claws are used, the blade can be held in a uniform state, and the photoreceptor can always provide good image quality.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the main parts of an electronic copying machine equipped with a blade holding device showing a conventional example of the present invention, FIG. 2 is a perspective view of the blade holding device, FIG. 3 is a vertical cross-sectional view thereof, and FIG. 4 The following shows an embodiment of the present invention, in which Fig. 4 is a perspective view of the blade holding device, Fig. 5 is a longitudinal sectional view thereof, Fig. 6 is a longitudinal sectional front view, and Fig. 7 A and B are respective presser claws. FIG. 4 is a perspective view showing different states of FIG. 27...Blade, 25...Fitting groove (concave groove), 26...Claw hole, 20...Support body (support plate), 1. ... Support shaft, 23 ... Presser pawl, 23a ... Claw portion.

Claims (1)

[Scope of utility model registration request] A support for holding a blade for scraping off residual toner adhering to a photoreceptor, the support having a fitting groove for the blade and a claw hole communicating with the fitting groove;
It is equipped with a support shaft attached to the support, and a presser claw that is slidably fitted into the support shaft and elastically biased in the circumferential direction, and the claw portion of the presser claw is in the claw hole. A blade holding device characterized by being able to be inserted into and removed from the blade and elastically held in each state.