JPS60209454A - Copying device - Google Patents

Abstract

PURPOSE:To automatically adjust the second paper feed timing by detecting the passing state of a copying material copying a test chart via a photoelectric element. CONSTITUTION:A test chart is copied as an original, the image information of the recording paper P thus obtained is detected via a photoelectric element 20, a detected signal S1 is calculated and processed by a chip microcomputer CUP and is managed until the best timing value is selected. That is, the microcomputer CUP compares the product t1l of the detected output t1 of the photoelectric element 20 and the moving speed (l) of the copying paper P with the white- color section length T of a test chart D, thereby the clutch of the second paper feed roller is operated to adjust the timing when paper feeding is started, and the second paper feed timing is automatically adjusted by comparing the values of t1l and T whenever one sheet is copied and repeating the adjustment of the timing value until both t1l and T are made equal.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a copying device that copies an original image onto a copying material such as recording paper, and is designed to facilitate the adjustment of the device and shorten the adjustment time. This invention relates to an improved copying apparatus.

[Prior art]

First, an overview of the electrophotographic copying apparatus will be explained with reference to the configuration diagram shown in FIG. In the figure, reference numeral 1 denotes a toner image bearing member which is formed of a drum and rotates in the direction of the arrow.

2 is an electrostatic latent image forming means, and a document photographing means (not shown).
An electrostatic latent image is formed on the surface of the toner image carrier l based on the optical image sent from the toner image carrier l. The electrostatic latent image is developed into a toner image by a developing device 3. On the other hand, copy materials such as recording paper carried in from the paper feed means 5 such as a cassette or manual feeder are
The paper is conveyed along the guide plate 7 in synchronization with the toner image on the toner image carrier 1 and at the same speed as the circumferential speed of the toner image carrier 1 by a feed roller (registration roller) 6, and is transferred. The toner image is transferred onto the copying material in contact with the surface of the toner image carrier 1 by the means 4 .

The copying material to which the toner image has been transferred is peeled off from the surface of the toner image carrier l and is conveyed to reach the fixing means 8. The toner image is fixed on the copy material by the fixing means 8, and recording is completed. The copy material that has passed through the fixing means 8 is discharged to the outside of the machine by a paper discharge roller 9.

In the above process, if the copying machine has been adjusted, the second
The timing of paper feeding (registration) is synchronized and adjusted so that the leading edge of the toner image on the toner image carrier 1 and the leading edge of the transfer paper match, but this adjustment process is This was done artificially by adjusting the volume, etc. Furthermore, if the line speed of the optical system differs depending on the magnification ratio, this second paper feeding timing must be adjusted for each magnification ratio, and due to mechanical precision (or irregularities), the operator needs to save time and effort for each machine. This type of adjustment by workers can lead to variations in machine adjustment accuracy due to the worker's level of proficiency and fatigue, which can lead to differences in quality. It is connected.

[Purpose of the invention]

The present invention automates the adjustment of the second paper feed timing, which was conventionally done manually in the adjustment process of a copying machine, thereby simplifying the adjustment work, shortening the adjustment time, and improving the quality of the copying machine. The purpose is to provide copying machines.

[Structure of the invention]

The present invention aims to achieve the above-mentioned object, and the present invention includes a photoelectric element arranged in a passage path of a copy material, a passage state of a copy material that has copied a predetermined test chart, detected by the photoelectric element, and The present invention provides a copying apparatus characterized in that the paper feed timing is controlled to be adjusted based on output.

〔Example〕

Figure 2 shows an example of a test chart (test original) used for timing adjustment of the present invention. It consists of a white part DA of (length in the scanning direction) T and a black part DB with a boundary part D2 as a boundary.

On the other hand, in the copying apparatus according to the present invention, for example, in the case of the copying apparatus shown in FIG. It is now possible to detect the presence or absence of images on recording paper as well as the black and white of images on recording paper.

When the test chart D shown in Fig. 2 is placed in a fixed position on the original table of the copying machine equipped with the photoelectric element and copied, the image of the test chart D is recorded on the recording paper. and is discharged from the device.

At this time, the detection signal (voltage) S applied to the photoelectric element becomes K as shown in FIG.

In FIG. 3, Pi indicates the leading edge of the recording paper, tl is the time required to pass the white portion of the recording paper, and P2 indicates the boundary between the white portion and the black portion of the recording paper. Now, if the moving (conveying) speed of the recording paper is e, then t, and if e=T, it means that the adjustment of the second paper feeding timing is carried out accurately.
If t, e>T, the second paper feeding timing is too early, and if t, e('r, the second paper feeding timing is too late).

The present invention aims to automate the timing adjustment of the second sheet feeding timing using the detection signal S1 shown in FIG.
Figure 4 shows a detailed diagram of the process. The test chart shown in Fig. 2) D is copied as a document, the image information of the recording paper P obtained by this is detected by the photoelectric element 204C, and the detection signal 8m is processed by the 1-chip microcomputer CPU to achieve the best timing. Manage values until they are selected.

That is, the detection output t1 of the microcomputer CPU #'i elemental element addition
The product hg and the moving speed e of the recording paper P and the test chart) D
The length T of the white part is compared with the length T of the white part of
A's club and chi are activated 1. Adjust the timing at which paper feeding starts, compare the values of td and T after each copy, and repeat the adjustment of the timing value until the two become equal. It is possible to automatically adjust the timing of paper, and the timing adjustment sequence is shown as an algorithm in FIG.

FIG. 5 (&) shows the timing adjustment mode routine,
FIG. 5(b) shows the Fi timer interrupt routine. In this sequence, T' is the timing data (count value) corresponding to the white part at the leading edge of the test chart D set in advance in the nonvolatile memo 1380M, and C1 is the count value corresponding to the white part at the leading edge of the recording paper P. It is a value. When the detected value of the photoelectric element is Ml (H), the timer interrupt count number is C1, and this value and the original count value T'
The flow is such that the second sheet feeding timing value TR is adjusted so that the values are equal to each other. After the adjustment to avoid deviation is completed, the second sheet feeding timing value TR is stored in a non-volatile memory, thereby improving usability.

The adjustment explained above is for l:l copying, but it can also be applied to a copying machine with a variable magnification function.In a copying machine with a variable magnification function, the scanning speed of the optical system changes, so this timing is Adjustments had to be made for each magnification. However, with the above adjustment method, all other work is done automatically by simply placing the test chart on the document loading table, so adjustments for each magnification can be easily performed by programming the microcomputer in advance. .

Once the timing adjustment described above is performed, there is no need to change it unless mechanical parts, optical system parts, etc. are replaced. The data is stored in the digital memory so that the contents are retained even if the power is turned off, and the data can be read when necessary.

Further, although the photoelectric element in this embodiment shown in FIG. 1 is used for timing adjustment, it is not limited to this, and can also be used as a paper discharge sensor or a jam detection sensor. In this embodiment, the photoelectric element is provided near the paper ejection roller of the copying device, but it may be provided on the transport path of the recording paper after the transfer, for example, it may be provided near the fixing device.

When a copying apparatus uses a heat roller fixing means, if the leading edge of the recording paper is black, the leading edge of the recording paper may wrap around the heat roller, causing a conveyance failure. As a countermeasure, the timing adjustment was intentionally shifted, and a width of 2 mm was added to the leading edge of the recording paper.
It has also been proposed to provide a white part with a deviation of about 3 degrees.

The adjustment of the present invention can also be adjusted to provide such a white part, and t, g='r+τ (for example, τ
All you have to do is adjust the TR so that

〔Effect of the invention〕

Conventionally, it took a lot of time, effort, and cost to adjust the timing of the second paper feed for each copying machine, but the present invention greatly simplifies the adjustment work and makes it inexpensive, stable, and good. Quality copying equipment is now available.

[Brief explanation of drawings]

FIG. 1 shows a schematic configuration of a copying apparatus, and FIG. 2 shows a chart. 6... Second paper feed roller 8... Fixing means 9... Paper ejection roller Addition... Photoelectric element D... Test chart) P
...Record paper agent Patent attorney No 1) Father-in-law No. 1 Zuto 76 Fig. 2 Fig. 3 Fig. 4

Claims (5)

[Claims] (1) A photoelectric element is arranged in the passage path of the copy material, the photoelectric element detects the passing state of the copy material on which a predetermined test chart has been copied, and the paper feeding timing is adjusted based on the detection output. A copying device characterized in that it is controlled. (2) The copying apparatus according to claim 1, wherein the test chart has different densities at the leading edge and near the leading edge in the traveling direction of the copying material. (3) Claims 1 or 2 characterized in that the timing data obtained from the detection output is compared with data stored in a non-volatile storage means.
Copying device as described in section. (4) The copying apparatus according to any one of claims 1 to 3, wherein the photoelectric element is disposed near a fixing device or a paper ejection roller. (5) The copying apparatus according to any one of claims 1 to 4, characterized in that the photoelectric element also serves as a paper discharge sensor.