JPH0214057Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a belt photoreceptor unit using a belt-shaped photoreceptor.

BACKGROUND OF THE INVENTION In recent years, in copying machines and the like that use a belt-like photoreceptor, a belt photoreceptor unit in which a belt-like photoreceptor is wound around a drive roller or a tension roller to form a unit has been widely used. In such a belt photoreceptor unit, the tension roller is movably held by a side plate constituting the unit and is biased in a direction to apply tension to the belt-shaped photoreceptor.

When assembling the unit in which the belt-shaped photoreceptor is wound around the drive roller or tension roller, the tension roller is displaced against the biasing force, and the belt-shaped photoreceptor is attached in the meantime. The assembly process is time-consuming. Incidentally, if a locking mechanism is provided that locks the tension roller at the position where it is displaced against the urging force, it will be easier to attach the belt-shaped photoreceptor.
The structure of the unit becomes complicated, and if the unit is set in the main body of the copying machine without being unlocked, it may become inoperable and the belt-shaped photoreceptor may be damaged.

Purpose This invention was devised in view of the above points, and the purpose is to obtain a belt photoreceptor unit that is extremely easy to assemble.

Configuration An embodiment of this invention will be described based on the drawings. The main body 1 of the copying machine consists of an upper structure 2 and a lower structure 3, and the upper structure 2 is provided so as to be openable upwards about a support shaft 4 as shown in FIG. The upper structure 2 supports a discharging lamp 5, a charger 6, a light source 7, and an imaging element 8, and the lower structure 3 supports a developing unit 9 and a transfer charger 10. To the right of the transfer charger 10 is a paper feeding section, in which a paper feeding roller 12 for feeding the transfer paper 11, a conveying/separating roller 13, and a registration roller 14 are provided in this order. On the other hand, the left side of the transfer charger 10 is a fixing sheet discharge section, which includes a conveyance roller 15, a fixing unit 16, and a sheet discharge tray 1.
7 are provided in order. On the inner surfaces of the side plates 18 on both sides of the upper structure 2, rails 19 each having a substantially U-shaped cross section are provided with a locking mechanism ( (not shown) so that it can be locked at a predetermined position.

Next, a lower case 24, which is a first case that holds the driving roller 21, the driven roller 22, and the tension roller 23, is provided, and side plates 25 on both sides of the lower case 24 have side plates 25 on the outer surfaces thereof that are slidable on the rails 19. A fitting portion 26 that fits into each is provided. The driving roller 21 and the driven roller 22 are supported between the side plates 25 in a fixed position, and the support shaft 27 of the driven roller 22 has support plates 28 located inside the side plate 25 on both sides thereof. The tension roller 23 is supported between these support plates 28, which are loosely fitted so as to be rotatable. A belt-shaped photoreceptor 29 is wound around these rollers 21, 22, and 23. Further, the lower case 24 is integrally provided with a toner collection container 31 that stores toner scraped off by a cleaning blade 30 that is in sliding contact with the belt-shaped photoreceptor 29.

Here, an upper case 32, which is a second case, is provided above the belt-shaped photoreceptor 29 and connected to the lower case 24. The lower case 24 is located at one end of the upper case 32 in the longitudinal direction.
An engaging portion 34 that engages with the engaging portion 33 formed at one end is formed, and an engaging portion 35 formed at the other end of the lower case 24 is formed at the other longitudinal end of the upper case 32.
An engaging portion 36 that engages with the lower case 24 is formed, and a screw mounting hole 38 that faces a screw hole 37 formed at the other end of the lower case 24 is formed. Further, on both sides of the upper case 32, locking claws 40 are provided that resiliently engage with locking portions 39 formed on the lower case 24.
is formed. Furthermore, springs 42 are attached to both sides of the upper case 32 as tension imparting members that elastically abut spring receivers 41 formed on the support plate 28.

In such a configuration, first, each roller 2
The operation of winding the belt-shaped photoreceptor 29 around the photoreceptors 1, 22, and 23 will be explained. The drive roller 21 and the driven roller 22 are fixed in position, but the tension roller 23 is not subjected to any external force and is rotatable together with the support plate 28 around the axis of the support shaft 27 of the driven roller 22. Therefore, by rotating the support plate 28 in the direction of arrow A shown in FIG. 3, the belt-shaped photoreceptor 29 can be easily wound around each of the rollers 21, 22, and 23.

The belt-shaped photoreceptor 29 wound in this manner
does not have the tension necessary for copying, and then the upper case 32 is connected to the lower case 24 in order to apply this tension. When connecting the upper case 32 to the lower case 24,
When the engaging portion 33 and the engaging portion 34 and the engaging portion 35 and the engaging portion 36 are engaged to determine the connecting position, the locking pawl 40 engages with the locking portion 39 and the temporary locking state is established. Become. Therefore, the screw 43 can be easily tightened into the screw hole 37 through the screw attachment hole 38. After tightening the screw 43, the lower case 24 and the upper case 32 are securely connected by the screw 43 and the engagement of the locking pawl 40 with the locking portion 39. By connecting the upper case 32, the lower end of the spring 42 comes into elastic contact with the spring receiver 41, and the support plate 28 and tension roller 23 move around the axis of the support shaft 27 in the direction of the arrow shown in FIG.
Forced in direction A'. Then, the tension roller 23 is displaced in the direction of the arrow A', and the belt-shaped photoreceptor 29 is given the necessary tension and becomes stretched. In this way, the lower case 24 and the upper case 32 can be easily connected, and the belt-shaped photoreceptor 29
Tension can be easily and reliably applied to.

Next, a description will be given of how the belt-shaped photoreceptor 29 is wound around the rollers 21, 22, and 23, and how the lower case 24, which is connected to the upper case 32, is inserted into the main body 1. The upper structure 2 is rotated upward around the axis of the support shaft 4, and the rail 19 is unlocked. With this unlocking, the rail 19 rotates around the axis of the support shaft 20 in the direction of arrow B shown in FIG.
It stops in a tilted state with the 0 side facing downward. and,
The fitting portion 26 is fitted into the rail 19 and inserted from the open side of the upper structure 2 and lower structure 3 in the direction of arrow C shown in FIG. After inserting it to a predetermined set position, the rail 19 is rotated in the direction of arrow B' shown in FIG. 2 and locked, and then the upper structure 2 is rotated downward to a predetermined position.
All settings are complete. Connect the fitting part 26 to the rail 1
When inserting the lower case 24 by fitting it into the upper case 9, the insertion is performed from the open side of the upper structure 2, which makes it possible to secure enough space for insertion. Sufficient insertion space can be secured even when the system is expanded. Also,
There is no need to provide a notch for insertion in the outer plates of the upper structure 2 and the lower structure 3, and the outer structure of the main body 1 can have sufficient strength. Furthermore, rail 19
Since the upper structure 2 is inclined diagonally downward along the insertion direction, the upper structure 2 can be surely inserted into the predetermined set position, and the upper structure 2 cannot be closed due to insufficient insertion. Damage to the lower case 24 and the like due to closing the upper structure 2 in the inserted state can be prevented.

Furthermore, the rail 19 locked by the locking mechanism rotates around the axis of the support shaft 4 integrally with the upper structure 2, and after the lower case 24 etc. are inserted and the rail 19 is locked, the upper When the structure 2 is opened, the lower case 24 and the like also move upward together. Therefore, there is a sufficiently wide space between the open upper structure 2 and the lower structure 3, making it easy to remove the jammed transfer paper 11 when a jam occurs and to perform maintenance and inspection.

Effects This invention allows the belt-shaped photoreceptor to be easily attached around the roller by making the tension roller of the rollers around which the belt-shaped photoreceptor is wound movable as described above. I can do it, and also.
The second case connected to the first case that holds each roller is provided with a tension applying member that displaces the tension roller so as to apply tension to the belt-like photoreceptor. It has effects such as being able to easily and reliably apply tension.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
Figure 2 is a schematic side view of the entire structure; Figure 2 is a schematic side view showing the upper structure in an open state; Figure 3 is an enlarged vertical sectional side view showing the upper case and lower case separated; The figure is an enlarged longitudinal sectional side view showing the state in which the upper case and lower case are connected, and Fig. 5 is the first
It is a sectional view taken along the line a-a in the figure. 21... Drive roller, 23... Tension roller, 24... Lower case (case), 29... Belt-shaped photoreceptor, 32... Upper case (case), 42
...Spring (tension imparting member).

Claims (1)

[Scope of utility model registration request] A first case holding at least a drive roller and a displaceable tension roller is provided, a belt-shaped photoreceptor is wound around these rollers, and the belt-shaped photoreceptor is connected to the case facing the first case. 1. A belt photoreceptor unit, comprising: a second case; and a tension applying member disposed in the second case for displacing the tension roller so as to apply tension to the belt-like photoreceptor.