JPS5958457A - Blade cleaning device of electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To prevent the permanent strain of a blade and to prolong its life by allowing a bracket to rotate around a shaft, and varying pressing spring pressure and press-contacting the blade against the surface of an image carrier uniformly to the overall length. CONSTITUTION:An arm 1 is pivoted in a rocking state on the shaft 3 parallel to the surface of a photosensitive drum 2 and energized toward the drum 2 by a spring 4. A U-shaped bracket 5 is fixed to the internal surface center of the lower part of the arm 1 by screws 6; and a rectangular blade 7 is arranged in the breadthwise direction of the drum 2 and both lengthwise end parts project from end parts of a holder 8. A pin 9 is implanted fixedly in the center of the holder 8 and fitted in the bracket 9 so that the holder 8 rotates and moves up and down. The blade 7 is pressed down by a spring 11 provided between a stopper 10 fitted to the pin 9 and the upper internal surface of the bracket 5 to press its lower edge against the surface of the drum 2 with specific force.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blade cleaning device for removing residual cleaning material.

Conventionally, as shown in Japanese Utility Model Publication No. 56-53-4-16, a plate is pivotally attached to a pair of rollers (which are pressed against both ends of the surface of a photoreceptor), and the blades are pressed against the surface of the photoreceptor, so that the plate is pressed against the surface of the photoreceptor. Blade cleaning devices that follow the surface are known, but in order to obtain a sufficient cleaning effect, the blade must be pressed against the surface of the photoreceptor at all times, which tends to cause permanent deformation of the blade. Also, there was a drawback that the blade was severely worn and had a short lifespan.

The present invention enables the bracket to be rotated around the shaft and moved in the axial direction.The bracket is always pressed against the surface of the support body with a weak force, and when in operation, the friction force that acts on the blade is applied. The blade is moved in the axial direction according to the change in the blade, and the spring pressure applied to the blade is changed to bring the plate into sufficient pressure contact with the surface of the image 411 holding body, and to apply pressure uniformly over the entire length. It is designed to eliminate the drawbacks of

1 and 2 show a first embodiment of the present invention.

Reference numeral 1 denotes an arm rotatably pivoted to a shaft 3 parallel to the surface of the photoreceptor drum 2, and is biased toward the photoreceptor drum 2 by a spring. Reference numeral 5 denotes an L-shaped bracket fixed to the center of the lower inner surface of the arm 1 with a screw 6. A rectangular blade 7 is disposed in the direction of the photoreceptor drum 2+iJh, and its longitudinal ends protrude from the ends of the holder 8. 9d] A pin implanted in the center of the holder 8 is fitted to the bracket 5 so that it can rotate and move up and down, and is attached between the stopper 10 fitted to the pin 9 and the inner surface of the bracket 5). The blade door is pushed downward by the blade 11, and its lower edge is pressed against the surface of the memorial tram 2 with a predetermined force. - Even if the lower end of the photoconductor 2 hits the photoreceptor 2, it will be automatically turned off and will touch the photoconductor 2 evenly.

Next, the effect will be explained. When the photoreceptor tram 2 rotates in the direction of the arrow I and 1q, the tip and end of the blade 7 are pressed with the same force by the I-ner 12 remaining on the surface of the photoreceptor drum 2. As a result, the arm] is rotated clockwise about the shaft 3, but due to the suppressing action of the spring 4=, ]i, the tip end of the plate 7 +-i is in pressure contact with the surface of the photoreceptor drum 20. However, 7('s [(terabane 11 is j-
Since the TE is compressed, the contact force between the plate 7 and the photoreceptor tram 2 increases. This increase in pressure contact force increases as the pressure resistance due to the toner [2] applied to the tip of grade 7 increases, and the cleaning effect increases.

Figures 3 and 4 show a second embodiment of the present invention.

Reference numeral 21 denotes an arm 23 which is parallel to the surface of the photoconductor tram 2 and is pivoted to allow pH6 to move freely.
He is facing 22.

25 is a mouth-shaped bracket, and 26 is the vertical length of the pair.
L 25 a is attached to the center of the lower inner surface of the arm 2 so as to be slidable downward. Reference numeral 27 denotes a rectangular plate disposed in the width direction of the photoreceptor tram 22, and both ends in the longitudinal direction protrude from the end of the holder 28. 29
Attach the bracket 25 with a similar pin in the center of the holder 28.
It is fitted in the lower part so that it can rotate and move up and down, and the stopper at the upper end: 30 and the 25-piece part Jy: +l11
A spring 31 is attached to the i-river and pulls the pin 29 upward to eliminate play. A spring 332 is installed between the upper surface of the bracket 25 and the upper part of the arm 21 to press the bracket 25 downward and press the lower end of the blade 27 against the surface of the photoreceptor drum 22 with a predetermined force.

The action is the same as in the 1st embodiment, and the surface of the photoreceptor 22 +/(T due to the remaining toner 83, when the ground 21 or 2:3 is struck once in the opening direction, the splash 3) is L
The pressing force between the f1 blade 27 and the photoreceptor toner 22 increases.

According to the present invention, poly-1 on the surface of the 7Fr image, l'l, i
If toner from step 1 or solid toner remains (li
, the H-force of the plate becomes larger by ii/ll L, and if the residual l·ner is small, the pressing force also becomes proportionally smaller. (-7) The tip of the blade is pressurized in two stages so that it is wetted by the wave cleaning, and even if there is some toner on the striped wall, the blade escapes and causes the toner to pass through. Don't be complacent.

1/ζ When cleaning is not being performed or when there is little residual toner, the blade pressure can be kept relatively weak. There is no need to keep the blade or the surface to be cleaned, and it is not only inexpensive, but also does not damage the blade or the surface to be cleaned or shorten the life of the blade. If 19 is taken out from all the longitudinal ends of the holders, the blade and boulder can be rotated ↑80 degrees with the pin as the center, so that when 14 can no longer be used due to an emergency, the other one can be used. Yes, the blade's lifespan is doubled and it can be used for 1 time.

In both examples, the pressure is applied using a spring, but the design can be modified freely by using a weight instead of a spring, or by hanging a torsion spring instead of a spring instead of a pin. It's not even the first thing to say.

[Brief Description of the Drawings] Fig. 1 shows a first embodiment of the present invention.
Fig. 2 is the same 7Y [view] Fig. 8 61 Second embodiment of the present invention;
FIG. 4 is a perspective view of the main part of the example. ■, 21...Arm, 2, 22/Photoconductor tojl, 8
．． 23...Offer, 4,24...Hane, 5,25...
・）゛Racket, 6, 26... Screw, 7, 27 Play 1.,' + 29 Pin, 10. i30 stopper, ] ], 31 ・Hane, ] ]2,
33-1 Suichi 132 Hane 7,

Claims (1)

[Claims] A bracket is attached to the swingable arm, and a shaft fixed approximately at the center of the plate is rotatably pivoted to the bracket, and the tip of the blade is pressed against the image carrier surface [ni] so that the blade can move in the axial direction. Electrophotocopy machine blade cleaning group @