JPH0820813B2 - Replacement peeling claw device - Google Patents

Description

The present invention relates to a replacement peeling pawl device used in an image forming apparatus such as a copying machine or a printer.

[Prior Art] Recently, cartridges of regularly-replaced parts have been promoted in copying machines, printers, etc., and the aim is to make it easy for general users to replace these parts and reduce maintenance service costs. Is to let.

In particular, there are few examples in which, as in JP-A-59-274297, the regular replacement parts arranged in the vicinity of the drum and the like are integrated into a cartridge.

[Problems to be Solved by the Invention] However, even if the regular replacement parts are made into a cartridge as described above, it is easy for a general user to carry out specialized operations and adjustments when attaching the cartridge to the apparatus body. There was a difficulty that could not be exchanged.

The present invention has been made to solve such a problem, and a general-purpose user can easily replace the peeling claw device for replacement that does not require specialized operations or adjustments and that operates properly. It is the one we are trying to provide.

[Means and Actions for Solving Problems] A case having a slit and attached to the main body of the image forming apparatus, and both ends thereof project from openings provided on both sides of the case, and are movable in the opening. The supported shaft, the first biasing means for pressing the shaft to a predetermined position in the opening by the biasing force, the peeling pawl rotatably supported by the shaft, and the peeling pawl with the slit. Second urging means for urging in a direction of projecting from the case to the outside of the case, and the second urging means for making the peeling claw stand by in the case when the shaft is at a predetermined position in the opening. Standby means for locking against the urging force of the urging means, and the image forming apparatus main body, the shaft is fitted after mounting the case, and the first urging means cooperates with the shaft to fit the shaft. A fitting part for holding the case and the case provided near the fitting part, When attaching the, the abutting against the shaft, by moving the shaft from a predetermined position of the opening against the urging force of the first urging means, the standby means is released, It is characterized in that it is provided with a convex portion for releasing the locking and for preventing the shaft fitted in the fitting portion from coming off after the case is mounted.

With such a configuration, the peeling claw is stored in the case at all times during storage and transportation, so that it does not damage it and is safe. In use, the release means is operated to activate the standby means. By releasing, the peeling claw can be projected to the outside of the case through the slit, so that it can be easily replaced and can be operated accurately.

Further, a fitting portion for fitting the shaft after mounting the case to the main body of the image forming apparatus and holding the case in cooperation with the first biasing means, and a fitting portion for contacting the shaft when mounting the case, By moving the shaft from a predetermined position of the opening against the urging force of the urging means of No. 1, the standby means is released to unlock the peeling claw, and after the case is attached, the fitted shaft is disengaged. By providing the convex portion for preventing the above, it becomes possible to easily and safely attach the case.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the entire structure of an embodiment of the present invention, and FIG. 2 is an explanatory view showing the essential parts of the same embodiment.
FIG. 3 and FIG. 4 are vertical sectional views for explaining the operation.

In FIG. 1 to FIG. 4, reference numeral 1 is a case composed of an upper case 1a and a lower case 1b, and a slit 3 for allowing the peeling claw 2 to project and retract is formed in the lower case 1b.

The peeling claw 2 has a triangular plate shape, is rotatably provided around the shaft 4 in the support portion 2a, and is urged by a spring 5 wound around the shaft 4 to constantly apply a rotational force in the direction of arrow A. Has been.

The standby means of the peeling claw 2 will be described. The shaft 4 has both ends thereof supported by the long holes 6 formed in the both-end bent portions 1c of the upper case 1a, and the leaf spring 7 fixed to the both-end bent portions 1c. Is urged upward by the arrow B.

Further, at a position corresponding to the peeling claw 2 of the upper case 1a, a claw storage portion 1d bent inside the case 1 is formed.

When the peeling claw 2 is stored or transported by the apparatus, as shown in FIG. 3, the peeling claw 2 is housed in the case 1, and the shoulder 2b of the supporting portion 2a abuts and engages with the claw storing portion 1d to be positioned. Is regulated and held in a standby state.

On the other hand, as a means for canceling this standby state, as shown in FIG. 1, a pair of reversing side plates 8 and 9 are provided on the main body side, and these side plates 8 and 9 have U-shaped notches 8a. , 9a and mounting support members 8b, 9b are formed.

Since the case 1 is attached to the main body, these supporting members 8
When it is pushed in the direction of arrow c along b and 9b, the shaft 4 is pushed in the direction of arrow D against the urging force of the leaf spring 7 by the convex portions 8c and 9c near the entrance of the U-shaped notches 8a and 9a. U-shaped notch
It will be in a state of being fitted to 8a and 9a.

At this time, as the shaft 4 is lowered, the shoulder 2b of the supporting portion 2a is disengaged from the claw storing portion 1d, so that the peeling claw 2 is rotated by the spring 5 and the slit 3 is moved to the case 3 as shown in FIG. 1 It will be in a state of protruding to the outside. FIG. 1 shows a state in which the peeling claw 2 is projected.

When the peeling claw 2 projects out of the case 1, the claw 2 moves to the fifth
As shown in the figure, the tip portion contacts the heat roller 10 on the fixing device side. In FIG. 5, 11 is a driven roll, 12 is a paper guide, and the lower surface of the case 1 also serves as a paper guide.

In the transfer section (not shown), the sheet on which the toner image on the dielectric drum is pressure-transferred is supplied between the heat roller 10 and the driven roller 11 of the fixing section, and the toner is fused and fixed by heat and pressure in this section. It After the fixing, the sheet advances so as to wind around the heat roll 10, and here, the sheet is separated by the separating claw 2 and advances as shown by a chain double-dashed line. It is reversed after passing through the roller 14 and is accommodated in the discharge stacker.

In this replacement peeling claw device, the peeling claw 2 is always housed in the case 1 during storage and transportation and is held in the standby state by the standby means. Therefore, the peeling claw 2 is not damaged and is safe. In use, the shaft 4 is pushed down by the protrusions 8c and 9c during mounting, and the shoulder 2b of the support portion 2a is moved to the claw storage portion 1.
Since the peeling claw 2 is inverted and protrudes out of the case 1 by the releasing means that is released from the engagement with d, it can be easily replaced by a general user and can be operated accurately.

The present invention is not limited to the above-mentioned embodiments, and can be carried out in various modified forms without departing from the scope of the invention. For example, it is possible to adopt a configuration in which a strip-shaped claw protrudes and retracts in a linear direction from the slit.

[Effects of the Invention] According to the present invention, it is possible to provide a replacement peeling pawl device that can be easily replaced by a general user without requiring a special operation or adjustment and can be operated accurately. .

[Brief description of drawings]

FIG. 1 is a perspective view showing the entire structure of an embodiment of the present invention, and FIG. 2 is an explanatory view showing the essential parts of the same embodiment.
FIG. 3 and FIG. 4 are vertical sectional views for explaining the operation, respectively, and FIG. 5 is an explanatory view showing a state where the heat fixing device is mounted. 1 …… Case, 1a …… Upper case 1b …… Lower case, 1c …… Bends at both ends 1d …… Claw storage section 2 …… Peeling claw, 2a …… Support section 2b …… Shoulder 3 …… Slit, 4 …… Shaft 5 …… Spring, 6 …… Long hole 7 …… Leaf spring, 8,9 …… Side plate for reversing 8a, 9a …… U-shaped notch, 8b, 9b …… Mounting support member 8c, 9c …… Convex part 10 …… Heat roll, 11 …… Longitudinal roll 12,13 …… Inversion roller, 14 …… Third roller

Claims (1)

[Claims] 1. A case having a slit, which is mounted on an image forming apparatus main body, and both ends of which are projected from openings provided on both sides of the case,
A shaft movably supported in the opening, a first urging unit that presses the shaft to a predetermined position in the opening by an urging force, and a peeling unit rotatably supported by the shaft. A claw, a second urging means for urging the peeling claw in a direction to project the peeling claw from the slit to the outside of the case, and the peeling claw inside the case when the shaft is at a predetermined position in the opening. Standby means for locking against the urging force of the second urging means so that the first urging means is kept on standby, and the first shaft is fitted on the shaft after the case is mounted. A fitting portion for holding the case in cooperation with a biasing means, and a biasing force of the first biasing means, which is provided in the vicinity of the fitting portion and contacts the shaft when the case is mounted. The shaft is moved from a predetermined position of the opening against the force of releasing the standby means to release the peeling means. With solving the engagement of the pawl, the replacement peeling pawl device being characterized in that and a protrusion for preventing disengagement of the shaft that is fitted into the fitting portion after case mounting.