JPS62150268A - Device for controlling stop position of belt-like photosensitive body - Google Patents

Abstract

PURPOSE:To shorten the idly running time at the time of image forming of a frequently used size with a simple constitution and to prevent the occurrence of deviation in the used part of a belt-like photosensitive body, by controlling the stop position of the photosensitive body so that the stop position after completion of recording operations can be determined in accordance with an image area corresponding to a specific image size. CONSTITUTION:Upon detecting a synchronizing mark 2, a sensor 6 outputs a signal to a pulse counter 7 and resets the pulse counter 7. The pulse number corresponding to the position, at which a belt-like photosensitive body 105 is to be stopped after the completions of copying operations are set in a pulse setter 9 and the count number of the pulse counter 7 is compared with the pulse number corresponding to the stop position set in the pulse setter 9 by a pulse comparator 8. When the two numbers coincide with each other, a signal is outputted to a motor driving device 10 and the belt-like photosensitive body 105 is stopped by stopping a driving motor 4. It is better to match the stop position of the photosensitive body 105 which determines the pulse number set in the pulse setter 9 to the most frequently used transfer paper size. Therefore, the idly running time can be made shorter in many cases.

Description

TECHNICAL FIELD The present invention relates to a stop position control device for an endless belt photoreceptor used in an electrostatic recording device.

Prior Art Endless belt photoconductors are widely used as one of the photoconductors in electrostatic recording devices such as electrophotographic copying machines, electrostatic printers, and facsimile machines.Endless belt photoconductors are made by rolling up a sheet and attaching both ends. Since it is made into an endless shape by welding, the joint portion cannot be used as an image forming area. Therefore, the image forming areas on the belt are determined to be equally spaced for each size, avoiding the joints of the belt photoreceptors. FIG. 2 is a diagram showing an example of the arrangement of image forming areas (segments) of a belt photoreceptor cut at a seam and developed.

In the example shown in the figure, five A4 segments indicated by one-dot chain lines, four B4 segments indicated by broken lines, and three A3 segments indicated by two-dot chain lines are arranged at equal intervals. In order to time all the image forming processes to avoid seams and create images in this way, a synchronization mark 2 is provided on the edge of the photoreceptor at a certain distance from seam 1, and is detected by a sensor. It looks like this.

When the image forming operation starts, the belt photoconductor rotates due to the rotation of the drive motor, and when the synchronization mark 2 is detected by the sensor, the signal is input to the control circuit, and the rotation is proportional to the amount of movement of the belt photoconductor. All image forming processes are set in advance for each image forming size and start operating at the next timing.

Conventionally, in a copying machine using such a belt photoreceptor, the belt photoreceptor was stopped at the same time as the copying operation was completed, so the next copying time depends on the copy size at that time and the image forming area that was last used. Depending on the size of the copy, there is a problem that the idle running time after the start of the copying operation becomes long.

Furthermore, in the conventional apparatus, once the copy size is determined, the image forming area to be used first is specified, which has the disadvantage that the used portion of the belt photoreceptor is uneven, resulting in a shortened service life.

Purpose The present invention solves the above-mentioned problems with the belt photoreceptor of a conventional electrostatic recording device, has a simple configuration, and can shorten the idle running time when forming images of frequently used sizes. In order to achieve the above object, the present invention aims to provide a stop position control device for a belt photoreceptor that is capable of controlling the stop position of a belt photoreceptor and is not biased in the used portion of the belt photoreceptor. is characterized in that it is controlled so that it is determined by an image area corresponding to a specific image size.

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

FIG. 1 is a diagram showing a schematic configuration of an example of a copying machine having a belt photoreceptor to which the present invention is applied. 200 is provided, and the document is automatically fed and circulated over the contact glass 101 a desired number of times. The entire surface of the document stopped on the contact glass is irradiated with light at the same time, and the first mirror 102, the lens 103, and the second
The belt photoreceptor 105 is exposed through the mirror 104.
Around the belt photoreceptor 105 are a charger 106, the exposure section, an eraser 107, a developer 108, and a transfer charger 1.
09 are disposed, and the toner images formed on the photoreceptor 105 are transferred to paper feed trays 110, 111, 112.
The image is transferred to a transfer paper fed to a transfer section via a conveyance path 113 and a registration roller 114, and after transfer, the transfer paper is sent to a fixing device 116 by a conveyance belt 115, where it is fixed and ejected to a paper output tray 117. be done.

As shown in FIG. 3, the belt photoreceptor 105 is wound around a drive pulley 3 which is rotated by a drive motor 4, and is driven by the drive motor 4. A pulse generator 5 is integrally attached to the shaft of the drive motor 4, and thereby generates pulses proportional to the moving distance of the belt photoreceptor 105. It is pulsed and counted. Reference numeral 6 indicates a synchronization mark 2 provided on the edge of the belt photoreceptor 105.
(See Figure 2) When the mark 2 is detected, it outputs a signal to the pulse counter 7.
Reset. The number of pulses corresponding to the position at which the belt photoreceptor 105 should be stopped after the copying operation is completed is set in the pulse setting device 9, and the number of pulses corresponding to the stop position set in the pulse setting device 9 and the count number of the pulse counter 70 are set. teeth,
If the two values are compared by the pulse comparator 8, a signal is output to the motor drive device 10 to stop the drive motor 4, thereby stopping the belt photoreceptor. do. The above flow is shown as a flowchart in FIG.

Now, the stop position of the belt photoreceptor 105, which determines the number of pulses set in the pulse setting device 9, is preferably set to the size of the transfer paper most frequently used. By doing so, the idle running time can be shortened in many cases. General 1F motsuyi folding tray f1-
In the case of a copier with multiple copying machines, the most frequently used paper size is loaded on the main paper feed tray, so the above stop position should be set to match the size of the transfer paper stacked on the main paper feed tray. . However, in cases where transfer paper of a particular size is used temporarily and frequently, it is recommended that the operator be able to specify the image size corresponding to the stop position using a selection switch provided on the operation panel. good. FIG. 5 shows the flow in these cases.

In addition, K, which prevents the used part of the belt photoreceptor from shifting, is important when determining the stop position of all image forming areas of a certain size, by setting any one of a plurality of image forming areas of that size to the stop position. The image forming area can be specified as an image forming area corresponding to the image forming area, and the set number of pulses may be changed so as to shift the stop position from time to time.

For example, if the image forming area being used for stop control is A4, in the example shown in FIG. The number of pulses P corresponding to the first image area is P = the number of stop pulses corresponding to the first image area, 11 x the number of pulses corresponding to the circumference of the photoreceptor, 15 (where n = ff, l, 2, 3.4).Stop Before starting the operation, the pulse value for n from σ to 4 may be set in the pulse setting device 9 using the operation section.

However, when stop control is performed in an A4 image area, the image areas do not match when copying an A3 image, so the idle running distance after the start of the copying operation becomes long. However, if A3 images are frequently formed, the image forming area used for stop position control should be changed to A3.
As mentioned above, it is sufficient to make it selectable.

Since three image forming areas of A3 are provided around the belt photoreceptor, the number of pulses at the stop position phP=number of stop pulses corresponding to the first image area 10nx number of pulses corresponding to the circumference of the photoreceptor/3 (However, n = σ, 1.2) Similarly, in the case of B4, the number of pulses at the stop position P = number of stop pulses corresponding to the first image area n x number of pulses corresponding to the circumference of the photoreceptor / 4 (However, n = e + i l 21
3) Effects As described above, according to the present invention, the idle running time when copying a copy size that is preferentially used is shortened, and the used part of the belt photoreceptor is not stiff, so that the belt photoreceptor can be easily used. The effect is to improve the lifespan of.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a schematic configuration of an example of a copying machine having a belt photoreceptor to which the present invention is applied; FIG. 2 is an explanatory diagram showing the arrangement of image forming areas of various sizes on the belt photoreceptor; FIG. 3 is a block diagram showing an embodiment of the belt photoreceptor stop position control device according to the present invention, FIG. 4 is a flowchart of the photoreceptor stop position control, and FIG. 5 is an image size at which the belt photoreceptor stop position is determined. 2 is a flowchart of the specification. 3... Belt photoreceptor drive pulley 4... Belt photoreceptor, drive motor 5... Pulse generating means 7... Pulse counting means 8.
...Pulse comparator 9...Pulse setter 100...
・Electrostatic recording device (copying machine) 105... Belt photoreceptor Fig. 2

Claims (3)

[Claims] (1) In the stop position control device for the belt photoconductor of an electrostatic recording device using a belt photoconductor having a plurality of image forming areas in one circumference and dividing the image forming area differently depending on the size of the image to be recorded, A stop position control device for a belt photoreceptor, characterized in that the stop position after a recording operation is completed is controlled to be determined by an image area corresponding to a specific image size. (2) The belt photoreceptor stop position control device according to claim 1, wherein the image size for which the stop position is determined can be specified. (3) Claim 1, characterized in that any one of a plurality of image forming areas having an image size corresponding to the stop position can be designated as the image forming area corresponding to the stop position. The stop position control device for a belt photoreceptor according to item 1 or 2.