JPH0559479U - Electrophotographic plotter photosensitive drum support mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] To enable highly accurate positioning of the photosensitive drum with a simple structure. [Structure] The frame side plate 2 that supports the photosensitive drum 4 is formed with a guide groove 8 that supports the support shaft 6 of the photosensitive drum 4 with play. The frame side plate 2 has a support shaft 6
A positioning side plate 10 having a positioning recess 12 for highly accurately positioning is pivotally supported.
When the support shaft 6 of the photosensitive drum 4 is arranged in the guide groove 8 and then the positioning side plate 10 is swung and the positioning recess 12 is fitted into the support shaft 6, the photosensitive drum 4 becomes the frame side plate 2. Be accurately positioned.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention irradiates the photosensitive surface of a photosensitive drum with light on which printing image information is printed to form an electrostatic latent image on the photosensitive surface, develops the electrostatic latent image, and exposes it as a toner image. The present invention relates to a photosensitive drum supporting mechanism for an electrophotographic plotter that visualizes the toner image on the surface and then transfers and fixes the toner image on a sheet.

[0002]

[Prior Art]

 In an electrophotographic plotter, the surface of the photosensitive drum may be scratched or toner may be contaminated, so it is necessary to replace the photosensitive drum at a predetermined time. Therefore, generally, the supporting mechanism of the photosensitive drum has a structure in which the photosensitive drum can be easily replaced.

[0003]

[Problems to be solved by the device]

 However, when the photosensitive drum was replaced, the distance between the photosensitive drum and the developing device was misaligned because the photosensitive drum was obliquely attached, and the image quality was sometimes affected. Further, the same development occurs even when the dimension of the drum bearing portion of the frame side plate cannot be accurately finished. The present invention aims to solve the above problems.

[0004]

[Means for solving problems]

 To achieve the above object, the present invention provides a photosensitive drum supporting mechanism of an electrophotographic plotter, which rotatably supports a photosensitive drum 4 at a predetermined position between the frame side plates 2, wherein the photosensitive member formed on the frame side plate 2 is used. It has a guide groove 8 for supporting the support shaft 6 of the drum 4 with some play, and a positioning recess 12 for restricting lateral deflection of the support shaft 6 in the guide groove 8, and can swing on the frame side plate 2. The positioning side plate 10 pivotally supported by the.

[0005]

When the support shaft 6 of the photosensitive drum 4 is inserted into the guide groove 8 of the frame side plate 2, the positioning side plate 10 is swung, and the positioning recess 12 is closely fitted to the support shaft 6 in the guide groove 8. The support shaft 6 is rotatably supported at an accurate position on the frame side plate 2.

[0006]

【Example】

 The structure of the present invention will be described below with reference to the embodiments shown in the accompanying drawings. FIG. 3 shows a schematic configuration of an electrophotographic plotter. The support shafts 6 at both ends of the photosensitive drum 4 are rotatably supported by the frame side plate 2 of the plotter body by a support mechanism described later, and the support shafts 6 of the drum 4 are detachably linked to the drive device.

When the photosensitive drum 4 is driven to rotate counterclockwise, the charge on the surface of the photosensitive drum 4 is removed by the charge eliminating lamp 20, and then the main charger 18 charges the photosensitive drum 4. Next, print image data is written on the surface of the photosensitive drum 4 by the print head 16 formed of a light emitting diode. The written data is developed by the developing device 14, and the data is sensed as a toner image. It is visualized on the optical drum 4.

Further, the transfer charger 26 and the peeling charger 24 transfer the toner image on the surface of the photosensitive drum 4 onto a sheet (not shown) conveyed in the horizontal direction from right to left in FIG. When the paper passes through the fixing device 22, the paper is fixed on the paper, and the paper is discharged to the discharge port.

Next, the photosensitive drum support mechanism will be described. A pair of frame side plates 2 (the other one is not shown) facing each other in parallel are formed with guide grooves 8 at the same position. As shown in FIG. 4, the guide groove 8 has a relatively wide shaft insertion portion 8a, a bearing portion 8c having a shaft mounting surface and wider than the diameter of the support shaft 6 of the photosensitive drum 4, It is composed of a shaft guide portion 8b having an inclined surface for guiding the shaft from the shaft insertion portion 8a to the bearing portion 8c. Reference numeral 10 is a positioning side plate, the upper part of which is rotatably supported at a predetermined position of each of the pair of frame side plates 2.

The lower surface of the positioning side plate 10 is provided with a positioning recess 12 having an open lower portion, which can be tightly fitted to the support shaft 6. Next, the operation of this embodiment will be described. When the photosensitive drum 4 is supported between the frame side plates 2, the positioning side plate 10 is swung counterclockwise around its pivotal support, and the upper part of the guide groove 8 is opened.

In this state, the photosensitive drum 4 is arranged between the frame side plates 2, and the support shaft 6 is inserted from above the guide groove 8 so that the support shaft 6 is loosened in the bearing portion 8 c of the guide groove 8. Insert and place it. In this state, the support shaft 6 is supported by the shaft mounting surface of the bearing portion 8c. Next, the positioning side plate 10 is rotated about its shaft support portion, and the positioning recess 12 is tightly fitted to the upper surface of the support shaft 6 as shown in FIG. As a result, the photosensitive drum 4 is positioned at an accurate position on the frame side plate 2.

[0012]

【effect】

 Since the present invention is configured as described above, the photosensitive drum can be supported at an accurate position on the frame side plate, so that the positional relationship between the photosensitive drum and the developing device can be set with high accuracy and the frame side plate Since accuracy is not required for the guide groove, there is an effect that cost can be reduced and yield can be improved.

[Brief description of drawings]

FIG. 1 is a side view.

FIG. 2 is a side view.

FIG. 3 is a side view.

FIG. 4 is an external view.

[Explanation of symbols]

 2 Frame side plate 4 Photosensitive drum 6 Support shaft 8 Guide groove 10 Positioning side plate 12 Positioning recess 14 Developing device 16 Print head 18 Main charger 20 Electrification lamp 22 Fixing device 24 Peeling charger 26 Transfer charger

Claims (1)

[Scope of utility model registration request] 1. In a photosensitive drum supporting mechanism of an electrophotographic plotter, which rotatably supports a photosensitive drum 4 at a predetermined position between frame side plates 2, a support shaft 6 of the photosensitive drum 4 formed on the frame side plate 2 is supported. The frame side plate 2 has a guide groove 8 for supporting and supporting play and a positioning recess 12 for restricting lateral movement of the support shaft 6 in the guide groove 8.
A photosensitive drum supporting mechanism for an electrophotographic plotter, which includes a positioning side plate 10 pivotably supported on the above.