JPS5824792B2 - Photoreceptor winding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photoreceptor winding device in an electrophotographic apparatus such as a copying machine.

Conventionally, photoconductor winding devices have been used to either: ■ rotate the winding roll at the same number of revolutions no matter how many times the winding roll is used to wind up the photoreceptor; something that winds up the body a certain length,
■There is one that measures the length of the photoreceptor during winding (in operation) and returns it to the winding means to wind it by a certain amount.

However, in the device (2), as the number of times of winding increases, the diameter of the winding roll increases and the length of winding of the photoreceptor increases, resulting in unnecessary winding of more than the required amount.

In a specific example, nearly 10 meters are wasted after 25 windings.

In the device (2), the length of the photoreceptor is theoretically fixed, but since it is wound by friction between the winding roll and the surface of the photoreceptor, if the frictional force decreases, it may slip and not be able to wind the photoreceptor to the required length. It's coming.

In particular, when a winding roll made of chloroprene or polyurethane is coated with toner, the frictional force is significantly reduced and the roll may slip.

In addition, in the apparatus (2), the length measurement method in which the amount of movement of the photoreceptor is converted into the rotation of the roller causes errors due to slippage, and the structure is complicated and costly, and the work of replacing the photoreceptor is complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a photoconductor winding device that can always reliably wind up a photoconductor to a certain length using a relatively simple mechanism.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a photosensitive drum in a copying machine.

The part of the web-shaped photoreceptor 1 that is wound onto the drum body 2 becomes a used segment, and as it is wound up by the take-up roll 3, the next segment from the supply roll 4 is pulled out onto the drum body 2, and the used segment is replaced. be done.

A drum interposer 5 is provided to rotate in conjunction with the rotation of the drum, and a switch 6 disposed at a fixed position detects the rotation of the drum by detecting passage of the interposer 5.

As shown in FIG. 2, the winding roll 3 is connected to a drive gear 12 via a planetary gear 7, a sun gear 8, a pinion 9, a clutch 10, and a pinion 11, and the drum body 2 is fixed to a rotating main shaft 13 and driven. Ru.

The drive gear 12 is integral with the main shaft 13, and the planetary gears 7 normally revolve around the sun gear 8 but do not rotate.

When the clutch 10 is connected, the planetary gear 7 rotates while revolving around itself to rotate the winding roll 3.

As shown in FIG. 3, the motor 14 drives a sprocket 15 integrated with the main shaft 13 via a chain 16.

Central processing unit CPU, read-only memory ROM
, non-volatile read/write memory R/WM, input/output port ■101 data, address, control bus BUS
A microcomputer consisting of the following controls the winding of the photoreceptor by controlling the clutch 10 and the motor 14 using inputs from the switch 6, reset switch, etc.

This case is shown in FIG. As shown, a part of the memory R/WM is used as a segment counter N1 and a winding counter NTU, and in the memory ROM, the winding length at each winding time corresponding to the segment number of a plurality of segments (n) is almost constant. The number of rotations of the winding roll 3.

is the rotational speed N1 of the drum body 2. N2...Nn are converted and stored.

In other words, the photoreceptor 1 has a plurality of segments of approximately equal length, and these segments are used by replacing them one after another (by winding them up onto the drum body 2). Power rotation speed N1. N2...
・N is stored in the memo' JROM.

FIG. 6 shows an example of the relationship between the number of rotations of the drum body 2 and the number of windings when the amount of winding each time is 679 mm.

From this figure, it can be seen that if the drum is rotated 30 times for the first photoconductor winding and 29 times for the second photoconductor winding, the photoconductor can be wound approximately 679 times. do.

The above-mentioned microcomputer resets the segment counter N by the reset input from the reset switch after the photoconductor 1 is set and before the first segment is used.
The 1-winding counter NTU is reset, and the operation shown in FIG. 5 is performed every time 2 signals for photoreceptor segment replacement are generated thereafter.

That is, first, the motor 14 is turned on and a signal from the switch 6 is taken in, and at the rising edge of the signal, the clutch 10 is turned on and the winding roll 3 is rotated.

Next, the winding counter NTU is incremented by 1 to count the number of rotations of the drum, and a memo IJRO corresponding to the count value and the contents of the segment counter Nseg is written.
The difference with the number NX in M is calculated, and if the answer is not zero, the above operation is repeated.

When the answer becomes zero and winding of an almost constant amount is completed, the segment counter N and egG are counted up by one and the NT
U is cleared, the clutch 10 is turned off, and the motor 14 is turned off.

Therefore, the segment counters N and eJ count the used segments of the photoconductor 1 (count the number of convenient segments), and when replacing each segment, a memorandum corresponding to the contents of the segment counter Nseg is used. The number NX in IJROM is N1. N2...
・Nn sequentially changes, the number NX and the winding counter N
Winding up of the photoreceptor 1 ends when the difference from the value of TU becomes zero, so the photoreceptor is wound up by approximately a constant length.

In addition to the actual cases mentioned above, N1. N2
...It is also possible to set Nn as an integrated value.

As described above, in the photoconductor winding device according to the present invention, the number of used segments of the photoconductor is stored and the number of revolutions of the winding roll member is controlled according to the retained content when replacing the photoconductor segments, so that the mechanism is It is relatively simple and the photoreceptor can always be replaced reliably by a substantially constant amount.

Furthermore, since the number of rotations of the drum is detected and counted by a winding counter, there is no malfunction due to mechanical stress.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a part of an embodiment of the present invention, Fig. 2 is a perspective view showing a gear mechanism of the embodiment, Fig. 3 is a schematic diagram showing the embodiment, and Fig. 4 is the same. Diagrams for explaining examples,
FIG. 5 is a flowchart showing the operation of the same embodiment, and FIG. 6 is a characteristic curve diagram showing the relationship between the number of rotations of the drum body and the number of windings in the same embodiment. 1...Photoreceptor, 2...Drum body, 3
・・・・・・Rolling rope 4・・・・Supply roll, 5・・・・Shutter, 6・・・・Switch, 10・・・・Clutch, 14・・・・・・・
Motor, CPU...Central processing unit, ROM...
...Read-only memory, R/WM...
Read/write memory, ■10... Input port.

Claims (1)

[Claims] 1. A web-shaped photoreceptor, a drum that supports the used segments of the photoreceptor, a roll member that winds up the photoreceptor and replaces the used segments, a motor that rotates the drum, and when replacing the used segments of the photoreceptor. An electrophotographic apparatus comprising a clutch for rotating the roll member in accordance with rotation of the drum, further comprising: a memory storing the number of rotations of the drum at the time of replacing each segment of the photoreceptor; A switch that detects the number of rotations of the drum, a winding counter that counts the signal from this switch, a segment counter that counts the number of used segments of the photoconductor, and a photoconductor segment exchange signal that turns on the clutch and removes the photoconductor. When the value of the winding counter reaches the value of the segment counter among the drum rotational speeds stored in the memory, the clutch is turned off and winding of the photoreceptor is finished. and means for causing the segment counter to count each time a used segment of the photoreceptor is replaced.