JPH0128514Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a charger holding mechanism for an electrostatic recording device such as a copying machine.

(Prior art) Conventionally, extruded aluminum rails have been used as guide members when inserting the charger into the copying machine body, but because extruded aluminum is expensive, sheet metal guide rails have recently been used. A charger holding mechanism is used that guides the charger into the copying machine main body and positions the charger using a pin attached to the copying machine main body. However, in such a conventional charger holding mechanism, since the sheet metal guide rail is bent or warped, the charger guided when the charger is inserted may damage the photoreceptor located near the charger.

Conventionally, the charger was guided away from the photoreceptor when it was inserted, and the charger was guided closer to the photoreceptor when the installation was completed in the copying machine body.
In addition to arranging sheet metal guide rails and positioning pins, the shape of the positioning pins is
The diameter of the tip is made smaller and a hexagonal shape is provided on the outer periphery near the bottom so that it can be attached with a spanner.
We also increased the overall diameter and provided a cross hole at the tip so that it could be attached with a screwdriver.
The charger was ensured to fit into the positioning pin.

However, in the above-mentioned conventional charger holding mechanism, if the diameter of the tip of the positioning pin is made small, it must be attached using a wrench, which is considerably labor intensive compared to attachment using a screwdriver. Furthermore, when a positioning pin with a large diameter is used, the hole in the charger that fits therein becomes large, creating problems in terms of space and increasing costs.

(Purpose) The present invention has been developed in view of the drawbacks of the conventional examples described above, and is an inexpensive method that allows the charger to fit smoothly with the positioning pin without damaging the photoreceptor when inserted into the main body of the copying machine. The present invention provides a charger holding mechanism with good workability during assembly.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. In Fig. 1, 1 is a guide rail installed inside the main body of the copying machine, and a plate spring 2 is attached to the top surface of the guide rail.
is fixed, and is installed with its lower surface facing the photoreceptor and with a predetermined gap between the end of the upper surface and the end of the charger insertion opening of the front plate 3 of the copying machine main body. Further, a positioning pin 4 is fixed at a predetermined position near the charger insertion opening of the front side plate 3. Reference numeral 5 designates a charger, in which a pair of plate-shaped cases 6 and 7 face each other, and end blocks 8 and 9 are fixed to both ends of the charger by sandwiching both sides of each case, and a wire 10 is inserted between both end blocks 8 and 9. It is constructed by being stretched. The end block 8, which is on the front side when the charger is inserted into the copying machine main body, has portions that protrude upward and downward at right angles to the longitudinal direction of the cases 6 and 7, respectively, and is positioned at the upwardly protruding portions. A U-shaped groove 8b is provided in the downwardly protruding portion to engage the rotation stopper pin 12 fixed to the drum support plate 11 of the copying machine main body.
is provided. Further, the other end block 9 has a cylindrical protrusion 9a having a tapered guide shape at the tip for fitting into a cylindrical portion 13a of a receptacle 13 installed on the rear side plate of the copying machine main body (not shown). , and a screw 9b connected to the wire 10 is fixed to the tip thereof. The cases 6 and 7 have bent portions 6a and 7a on the upper surface of the charger 5, respectively, which are bent and protrude from the side surfaces of the charger 5.
and 7a engage the guide rail 1,
It is attached to the end blocks 8 and 9 so as to have a predetermined gap from the upper surface of each end block. Also,
At the ends of the cases 6 and 7 on the end block 8 side, there are trapezoidal convex portions 6 that protrude upward, respectively.
b and 7b are formed.

In the above configuration, the charger 5 is guided and positioned within the main body of the copying machine as follows.
First, insert the ends of the bent portions 6a and 7a of the cases 6 and 7 on the end block 9 side into the gap between the guide rail 1 and the front plate 3, align the bent portions 6a and 7a with the guide rail 1, and set the charger. 5 into the copier body,
The bent portions 6a and 7a are pushed up by the leaf spring 2 fixed to the guide rail 1, and the front plate 3
The end block 9 comes into contact with the lower surface of the guide rail 1, and the charger 5 is drawn away from the photoreceptor (upward in the figure). When the charger 5 is pushed in further in this state, the screw 9b at the tip of the protruding part 9a of the end block 9 enters inside the cylindrical part 13a of the receptacle 13, and is guided toward the photoreceptor by the tapered guide part. Then, the cylindrical portion is fitted into the cylindrical portion 13a, and the end on the end block 9 side is positioned. In addition, as shown in FIG. 2, the end of the charger 5 on the end block 8 side is such that the end of the front plate 3 comes into contact with the inclined portions of the trapezoidal convex portions 6b and 7b of the cases 6 and 7. When the charger 5 is pushed in as it is, the charger 5 is pushed toward the photoreceptor due to its inclination, and the charger 5 approaches the photoreceptor until the end of the front plate 3 comes into contact with the flat portion of the convex portions 6b and 7b. Then, when you push the charger 5 further,
As shown in FIG. 3, the tip of the positioning pin 4, which has a slightly tapered tip, enters the hole 8a of the end block 8, and the other inclined portion of the trapezoidal convex portions 6b and 7b. As a result, cases 6 and 7 begin to separate from the front plate 3,
The positioning pin 4 is completely fitted into the hole 8a of the end block 8, the end block 8 is positioned, and the charger 5 is completely set in the main body of the copying machine. At this time, the U-shaped groove 8 of the end block 8
b engages with a rotation stop pin 12 fixed to the drum support plate 11 to prevent the entire charger 5 from rotating. Note that the leaf spring 2 also serves to prevent the inserted charger 5 from coming off.

FIG. 4 is a diagram showing another embodiment of the present invention, in which a convex portion is provided to narrow the case.
It has the same effect.

(Effects) As explained above, the present invention does not require special parts by simply providing a convex portion on the case, and does not require large positioning pins that would increase the cost. Since it can be installed with a screwdriver, it is inexpensive and easy to assemble.
Furthermore, since the charger moves up and down by the convex part of the case and is set in the copying machine by fitting with the positioning pin from a position sufficiently far away from the photoreceptor, there is no need to visually check the charger when setting it. In addition to improving workability, the vertical movement of the charger provides a feeling of setting, prevents setting errors, and does not damage the photoreceptor.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the configuration of an embodiment of the present invention, FIGS. 2 and 3 are diagrams showing the process of an embodiment of the present invention, and FIG. 4 is an exploded perspective view showing the configuration of an embodiment of the present invention. FIG. 7 is a perspective view of another embodiment. DESCRIPTION OF SYMBOLS 1... Guide rail, 3... Front side plate, 4... Positioning pin, 5... Charger, 6, 7... Case, 6b, 7b... Convex shaped portion, 8, 9... End block.

Claims (1)

[Scope of utility model registration request] An electrical connection member disposed on the back side plate of the electrostatic recording apparatus body, a positioning pin or fitting hole disposed on the front side plate of the apparatus body, and a positioning pin or fitting hole disposed in the vicinity of the electrical connection member. A guide rail for guiding the charger fixed to the device main body near the fitting hole, an elastic member that biases the charger in a direction to separate it from the photoconductor when the charger is inserted along the guide rail, and an elastic member at the back of the charger. A connecting portion provided on the side end block and engaged with the electrical connection member; a fitting hole or positioning pin provided on the front end block of the charger that fits with the positioning pin or fitting hole; A charger holding mechanism comprising a convex portion formed at the front end of the case and guiding the fitting between the positioning pin and the fitting hole.