JPH0675452A - Controller for image forming device - Google Patents

Abstract

PURPOSE:To prevent miscopying caused by a misoperation and to prevent reduction in productivity. CONSTITUTION:In an image forming device capable of forming an image on both of a plain paper and a film for OHP, as a transfer material, a sensor for detecting the film for OHP 32 arranged in a paper feeding tray 28 and a means for changing an image forming parameter with the signal of the detecting sensor 32 are provided. For instance, through-holes 28c and 28d are formed on the paper feeding tray 28, a light emitting element 32a and a light receiving element 32b are arranged opposite to the through-holes 28c and 28d or a reflection sensor is arranged on the paper feeding tray, and the mark of low reflection is provided on the film for OHP.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to form an image on both plain paper and an OHP (overhead projector) film as a transfer material in an image forming apparatus such as a copying machine, a facsimile or a printer which uses an electrophotographic method. The present invention relates to a control device for an image forming apparatus.

[0002]

2. Description of the Related Art In the above image forming apparatus, a charge corotron, an exposure device, a developing device, a transfer corotron, a cleaning device, a discharge lamp and the like are arranged around the image carrier, and the image carrier is carried by the charge corotron. After the body is uniformly charged, an electrostatic latent image is formed on the image carrier by the exposure device, this electrostatic latent image is developed into a toner image by the developing machine, and then this toner image is transferred. After the transfer image is transferred to the material by the transfer corotron, the transferred image is fixed, while in the image carrier, the cleaning device removes the residual toner on the image carrier, and then the charge removal lamp removes the charge on the image carrier. Image formation is performed by a series of processes.

In the image forming apparatus, there is known a method having a function of enabling image formation on both plain paper and OHP film as a transfer material. In this system, the conditions such as charging, exposure, development, transfer, and fixing, that is, the image forming parameters are different between plain paper and OHP film. Changes the image forming parameters by inputting information of plain paper or OHP film, or installs an OHP film detecting sensor in the transfer material conveying path, and automatically sets the image forming parameter by the signal of this detecting sensor. I am trying to change it.

[0004]

However, among the above-mentioned conventional methods, the method of providing a dedicated button on the control panel has a problem that a miscopy occurs due to the operator forgetting to operate the transfer material. In the system in which the OHP film detection sensor is provided in the transport path, O is set until the image forming parameters are set.
There is a problem that CPM (the number of copies produced per hour) is lowered because the HP film is once put on standby in the registration section or the like.

The present invention is intended to solve the above-mentioned problems, and in an image forming apparatus capable of forming an image on both plain paper and an OHP film as a transfer material, miscopy and reduction in productivity due to operation mistakes occur. An object is to provide a control device that can be eliminated.

[0006]

In order to achieve the above object, a control device for an image forming apparatus according to the present invention is an image forming apparatus which enables image formation on both plain paper and OHP film as a transfer material. , O placed in the paper feed tray
It is characterized by comprising an HP film detection sensor and means for changing an image forming parameter according to a signal of the detection sensor. As an example, a through hole is formed in the paper feed tray, and a light emitting element and a light receiving element are arranged facing the through hole, or a reflection type sensor is arranged on the paper feed tray, and the OHP film is Provide a low-reflection mark.

[0007]

In the present invention, the OHP is placed at the position of the paper feed tray.
Since it is detected whether or not it is a film for use, and the image forming parameter is changed accordingly, it is possible to eliminate erroneous copying due to an operation error and reduction in productivity.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 is an overall configuration diagram of a color image forming apparatus to which the present invention is applied. The present invention is not limited to the color image forming apparatus, but can be applied to a single color image forming apparatus, and is not limited to the transfer material conveying belt, and can be applied to the transfer drum. is there. The transfer material conveying belt 11 is formed of an endless belt coated with a dielectric film, and has a plurality of rolls 12, 1 having at least a driving roll 12 and a tension applying roll 14.
It is stretched over 3, 14, and 15 and rotated in the direction of arrow A in the figure. Four sets of image forming units K, Y, M, and C for black, yellow, magenta, and cyan are arranged facing the upper surface of the transfer material transport belt 11.

Each of the image forming units K, Y, M, and C includes an image carrier 16 composed of a photosensitive drum, a charge corotron 17, a latent image writing means 18, a developing device 19, a transfer corotron 20, and an image carrier cleaner. 21, a transfer material discharging corotron 22 is provided on the downstream side of the image forming units K, Y, and M, and the image carrier 16 is rotated in the direction of the arrow in the figure.

On the downstream side of the image forming unit C at the final stage, a peeling corotron 23 and a peeling claw 24 are provided, and a fixing device 25 is further provided. On the upstream side of the drive roll 12, a conveyor belt static elimination corotron 26 and a cleaning blade 27 are arranged. Further, on the downstream side of the drive roll 12, a suction corotron 30 is arranged inside the transfer material conveying belt, and a transfer material suction roll 31 is arranged facing the suction corotron 30. The transfer material in the paper feed tray 28 is transported to the transfer material transport belt 11 by the feed roll 29, and then is attracted to the transfer material transport belt 11 by the suction corotron 30 and the transfer material suction roll 31.

In the above-mentioned color image forming apparatus, the image carrier 16 is uniformly charged by the charge corotron 17, the original image is exposed by the latent image writing means 18, and the electrostatic latent image is formed on the image carrier 16. An image is formed. Developing machine 1
At 9, the toner is brought into contact with the surface of the image carrier 16 to form a toner image, and the developed toner image is transferred to the transfer corotron 2.
After transfer to the transfer material on the transfer material transport belt 11 at 0,
A series of image forming cycles is performed by scraping off the toner remaining on the image carrier 16 with the cleaner 21, and this cycle is performed by four image forming units K, Y, and
This is performed by M and C, and a plurality of toner images are sequentially superposed and transferred onto the transfer material that is adsorbed and conveyed by the transfer material conveying belt 11.

FIG. 1 is a partial cross-sectional view of the paper feed tray 28 of FIG. 5, showing one embodiment of the control device of the image forming apparatus according to the present invention. The paper tray 28 is a bottom plate 28.
a, an upper plate 28b, and a bottom plate 2
Through holes 28c and 28d are formed in the 8a and the upper plate 28b so as to face each other, and a sensor 32 including a light emitting element 32a and a light receiving element 32b is arranged so as to face the through holes 28c and 28d. On one side of the paper feed tray 28,
A feed roller 33 and a transfer material presence / absence detection sensor 34 are provided. In addition, the through hole 28 of the bottom plate 28a
When the c is provided in a portion where the upper plate 28b facing the c is not provided, the through hole 28d is naturally omitted.

The operation of this embodiment having the above-described structure will be described. When the transfer material T in the paper feed tray 28 is plain paper, the through holes 28c and 28d are closed, so that the light from the light emitting element 32a is not emitted. Since it is not detected by the light receiving element 32b, an OFF signal is output to a control circuit (not shown), and when the transfer material T in the paper feed tray 28 is an OHP film,
The light of the light emitting element 32a passes through the through holes 28c and 28d, is received by the light receiving element 32b, and outputs an ON signal to a control circuit (not shown), thereby enabling the identification signal of the plain paper and the OHP film to be output.

2A and 2B show another embodiment of the controller of the image forming apparatus according to the present invention. FIG. A is a partial sectional view of the paper feed tray, and FIG. B is a plan view of the OHP film. In addition,
The same components as those in the embodiment of FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In the above embodiment, the paper feed tray 2
When all the transfer materials in 8 are plain paper or OHP film, they can be distinguished from each other.
There is plain paper inside, and when the OHP film is set on it, the two cannot be distinguished.

Therefore, as shown in FIG.
A reflection type sensor 35 is arranged above 8, and a low reflection mark 37 is applied to the OHP film 36 so as to face the detection position of the reflection type sensor 35. This mark 37 is shown in Figure B.
As shown in FIG. 5, it is formed at four places on the OHP film 36, but it may be formed at one place.

The operation of this embodiment having the above-described structure will be described. When the transfer material T on the paper feed tray 28 is plain paper, the light from the light emitting element 32a is detected by the light receiving element 32b. An ON signal is output to a control circuit (not shown), and when the transfer material T in the paper feed tray 28 is an OHP film, the light of the light emitting element 32a cannot be detected by the light receiving element 32b due to the low reflection mark 37, and the light is turned off. By outputting the signal to a control circuit (not shown), it is possible to output the identification signal of the plain paper and the OHP film.

3 and 4 are flow charts showing an example of processing in the control device of the image forming apparatus of the present invention.

FIG. 3 shows an example in which after the copy start (the start button is turned on), it is judged whether or not it is the OHP film every set number of sheets, and the parameter is set to the plain paper or the OHP film. In the example, after the start of copying, it is determined whether or not the first sheet is an OHP film, but after the second sheet, the same parameters are used until the set number of sheets is completed.

[0019]

As is apparent from the above description, according to the present invention, in the image forming apparatus which enables the image formation on both the plain paper and the OHP film as the transfer material, the OHP arranged on the paper feed tray is provided. Since it is provided with a film detection sensor for the film and a means for changing the image forming parameter according to the signal of the detection sensor, it is possible to prevent erroneous copying due to an operation error and reduction in productivity.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a paper feed tray of FIG. 5, showing an embodiment of a control device of an image forming apparatus according to the present invention.

2A and 2B show another embodiment of the control device of the image forming apparatus according to the present invention, FIG. A is a partial sectional view of a paper feed tray, and FIG. B is a plan view of an OHP film.

FIG. 3 is a flowchart showing an example of processing of a control device according to the present invention.

FIG. 4 is a flowchart showing an example of processing of a control device according to the present invention.

FIG. 5 is an overall configuration diagram of a color image forming apparatus to which the present invention is applied.

[Explanation of symbols]

28 ... Paper feed tray, 28c, 28d ... Through hole 32, 35 ... OHP film detection sensor, 32a, 3
5a ... Light emitting element 32b, 35b ... Light receiving element, 36 ... OHP film,
37 ... Mark

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location G03G 15/16 15/22 103 Z 6830-2H

Claims (3)

[Claims] 1. An image forming apparatus capable of forming an image on both plain paper and an OHP film as a transfer material,
A control device for an image forming apparatus, comprising: an OHP film detection sensor arranged in a paper feed tray; and means for changing an image forming parameter according to a signal from the detection sensor. 2. The control device for an image forming apparatus according to claim 1, wherein a through hole is formed in the paper feed tray, and the light emitting element and the light receiving element are arranged facing the through hole. 3. A control device for an image forming apparatus according to claim 1, wherein a reflection type sensor is arranged on the paper feed tray and a low reflection mark is provided on the OHP film.