JPS6035664B2 - electrophotographic copying device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic transfer type electrophotographic copying device, and in particular, it reads the density of a toner density sensor mark formed on a non-image area of a photosensitive drum using a photoelectric conversion method, and then adjusts the density. Even if toner, dust, etc. adhere to the toner concentration detection element that automatically supplies toner to the developing section according to the amount of time, it is automatically removed to ensure accurate density detection at all times. This is the purpose.

Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 1 is a front view of the main part of the same embodiment, and FIG. 2 is a side sectional view of the main part. In these drawings, reference numeral 1 denotes a photosensitive drum having a photoelectric layer on its surface, which is rotatably supported by a shaft 2 at a predetermined portion of the main body of the copying apparatus. 3, a portion 3a located below the photosensitive drum 1 on one end side (on the right side in FIG. 2) of the photosensitive drum is pivoted by a pin (or spindle) 5 to a support portion 4a provided on the base body 4. This is a support member arranged to be rotatable in the vertical direction by being supported.

Reference numerals 6 and 7 denote a transfer charger and a paper peeling charger, respectively, which are mounted on the support member 3 so as to face the surface of the photosensitive drum 1, and these chargers are used to charge the photosensitive drum when in use. They are arranged parallel to axis 2.

Note that the charger provided on the support section 3 is not limited to the above two chargers, and may be only one of them. 21 is a toner concentration detection element attached to the support member 3, which will be described later.

Reference numeral 8 denotes a part of the support member 3, specifically, a part located on the other end side of the photosensitive drum 1, by a plurality of pins 9a and 9b, which are guide members, to form arrows A and A shown in FIG. This is a slide member mounted so as to be movable in the direction ', that is, in the longitudinal direction of the axis of the photosensitive drum 1.

Here, the position where the slide member 8 is displaced most to the right in FIG. 2 is referred to as a first position, and the position where the slide member 8 is displaced most to the left is referred to as a second position. This is a tension spring mounted between the slide member 8 and a pin 11 mounted on the support member 3 in order to position the slide member 8 in the first position.
Reference numeral 12 denotes a handle portion formed in a part of the slide member 8, and this is a portion on which the operator places his/her hand when moving the slide member 8 in the direction of arrow A.

13 is an engaging member attached to the lower part of the slide member 8; 14 is a holding member such as a fixed cam member fixed on the base 4; a first engaging portion 15a capable of locking the engaging member 13 of the slide member 8 in order to hold the supporting member 3 in a state where the supporting member 3 is positioned in an operating position close to The support member 3 should be held in a state in which the main parts of the chargers 6 and 7 are located at a non-operating position far away from the photosensitive drum 1 (the engaging portion 13 of the slide member 8 should be locked). It has a second engaging portion 15b that can be moved.

Next, the configuration of the main parts of the present invention will be explained in detail with reference to FIGS. 3 and 4.

Note that the same parts are given the same reference numerals. The toner concentration detection element 21 described above is constructed by integrally molding a light emitting element 22a and a light receiving element 22b for receiving reflected light with resin or the like, and is attached to the support member 3. The paper guide plate 23, which is attached integrally or separately to the support member 3, has a portion at a corresponding position so that the toner concentration detection element 21 faces the photosensitive drum 1 and does not interfere with light irradiation and reflected light reception. 24 is formed. A cleaning plate 25 is provided with a cleaning member 26 made of a buff, cloth, sponge, etc., which contacts the toner concentration detection element 21 and cleans the light emitting element 22a and the light receiving element 22b when sliding. It passes through the hole 27 and is fixed to the slide member 8.

In addition, through holes 28 are provided at corresponding force points of the light emitting and light receiving elements so as not to interfere with light emitting and light receiving during copying operations. This configuration also prevents light diffusion when the light emitting element is irradiated with light. Then, by sliding the cleaning plate 25, the light emitting and light receiving elements are cleaned of toner stains and the like by the cleaning member 26, as shown in FIG. 4B. Next, the handling procedure of this embodiment will be explained. In the copying operation state, as shown in FIGS. 1 and 2, the engaging member 13 is located and locked in the first engaging portion 15a of the holding member 14, and the chargers 6 and 7 are in the operating position. be. Here, if you want to inspect the inside of the copying machine, or if a paper jam occurs near the photosensitive drum and you want to remove it, open the cover (not shown) of the copying machine main body, and put your hand on the handle 12. and pull it in the direction of arrow A.

At this time, the slide member 8 is moved from the first position to the second position against the tensile force of the tension spring 10, and the engagement member is disengaged from the first engagement portion 15a of the holding member 14. Further, since the cleaning plate 25 is also slid as the slide member 8 moves, the cleaning plate 26 is moved over the light emitting element 22a as shown in FIG. 4b.
and the light receiving element 22b are brought into sliding contact.

When the handle portion 12 is lowered in this state, the support member 3, together with the chargers 6 and 7, the slide member 8, and the engagement member 13, is rotated about the pin 5 as a fulcrum as shown by the chain line in FIG. The member 13 is attached to the green portion 1 of the holding member as shown by arrow B.
4a, and is stopped at the second engaging portion 15b.

In this case, the support member 3 has a charger 6,
There is no need to forcefully push down the handle 12 because it moves downward in proportion to the weight of the handle 7 and the slide section 8. Even if you release your hand from the handle portion 12 in the above state, the downward movement state is maintained. Therefore, the chargers 6 and 7 are held in the non-operating position, and the distance from the photosensitive drum 1 increases as the distance approaches the handle portion 12. This makes it easy to inspect the vicinity of the photosensitive drum and remove paper jams. To return it to its original position, it is sufficient to simply lift the handle portion 12.

That is, when the handle part 12 is lifted, the engaging part village 13 moves from the second engaging part 15b of the holding member 14 to the green part 14a and reaches near the first engaging part 15a, and then the tension spring 1
It is brought to the first engaging portion 15a by a tensile force of 0, and as shown in FIG. 2, the chargers 6 and 7 are locked in the operating position. At this time as well, the cleaning plate 25 moves to its original position as shown in FIG. 4a as the slide member 8 returns, so that the cleaning member 26 again comes into sliding contact with the light-emitting and light-receiving elements 22a and 22b and cleans them. become.

As is clear from the above description, the present invention enables inspection of the interior of a copying machine to remove toner, dust, and other contamination adhering to the toner concentration detection element, and removes jammed paper by operating the handle of the slide member to remove the photosensitive drum and the charger. Since the cleaning member can automatically clean the parts by following the actions of increasing the distance between them or returning them to their original state, performance deterioration due to dirt can be prevented.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a front view of the main part of an embodiment of the present invention, Fig. 2 is a side sectional view of the main part of the embodiment, and Fig. 3 is a sectional front view of the main part.
FIGS. 4a and 4b are sectional side views of essential parts showing the relationship between the cleaning member and the toner concentration detection element in the same embodiment. 1... Photosensitive drum, 3... Support member, 4.
... Base body, 4a ... Supporting part, 5 ...
... Pin (or support shaft), 6... Charger for transfer, 7... Charger for paper peeling, 8... Slide member, 9a, 9b... ...Pin, 10...
...Tension spring, 12...Handle part, 13...
...Engaging member, 14...Holding member, 14a
...Ayase part, 15a...First engaging part, 1
5b... Second subjunction part, 21... Toner concentration detection element, 22a... Light emitting element, 22b.
... Light receiving element, 24 ... Notch, 25.
...Cleaning plate, 26...Cleaning member. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A paper guide plate equipped with a charger and partially provided with a notch, and a support member provided with a toner concentration detection element at a position corresponding to the notch, the part located on one end side of the photosensitive drum. rotatably pivoted to the base and movably engaged with the support member between a first position and a second position;
and a sliding member is movably attached to the other end in the longitudinal direction of the photosensitive drum, and a cleaning member that can slide into contact with the toner concentration detection element is provided in a part of the sliding member. Photocopying equipment.