JPS63131156A - Developing color misselection preventing device for copying machine - Google Patents

Abstract

PURPOSE:To select a color and start a copying process by one-time operation and to prevent the color from being misselected by providing the operation part of a copying machine with 1st and 2nd switches for color selection and copying starting which are as many as developing tanks and start a copying process, and driving and controlling a developing tank switching device with the output signals of the switches. CONSTITUTION:A 1st developing tank 13, a 2nd developing tank 14, and a 3rd developing tank 15 are arranged at the periphery of the photosensitive body 12 of a copying machine main body 11 so that they are switched automatically between a development attitude and a nondevelopment attitude. Further, one of the developing tanks 13-15 is set at the development attitude by the developing tank switching device 16 (16A-16C) and other tanks are set at the nondevelopment attitude. The operation part 5 of this copying machine main body 11 is provided with the 1st, the 2nd, and the 3rd common-use switches 17-19 for both color selection and starting the copying process which are as many as the developing tanks 13-15. Those respective switches 17-19 are connected to a controller 20, which drives and controls the devices 16 which the output signals of the respective switches 17-19 to select a color and start a copying process at the same time by one-time operation.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a device for preventing errors in selection of developing colors in a multi-color copying machine such as a twin-color type copying machine.

<Prior Art> In a conventional twin color copying machine, a first developer tank and a second developer tank are arranged around a photoreceptor in the main body of the copying machine so as to be switchable between a developing position and a non-developing position. A developing tank switching device was provided for switching one of the developing tanks to a developing position and the other to a non-developing position.

And if this is a twin color type copying machine, the 5th
As shown in the figure, copying was possible by the operator selecting the color selection switch on the operation panel and then pressing the copy start switch. The operating section is shown in FIG. In the figure, 1 is a copy start switch, 2 is a number setting switch, 3 is a number display section, 4A, 4B.

4C are color selection switches, respectively.

Problems to be Solved by the Invention However, when the previous user makes a copy after selecting a color, the user must press the copy start switch 1 after selecting the color again. Furthermore, a copying error may occur in which the operator does not notice the color selection and copies in the color selected by the previous user.

Therefore, some machines have a function that returns to the main developing color after a certain period of time, but this function does not work if the operator is replaced within a certain period of time.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to prevent mistakes in selection of development colors and copy mistakes, and to simplify key operations by an operator.

<Means for Solving the Problems> The means for solving the problems according to the present invention is to combine the color selection switch and the copy start switch, which were conventionally installed separately, into one switch. Operation section 5
A first dual-purpose switch 17 and a second dual-purpose switch 18 are provided in which the same number of developer tanks 13 and 14 are used to select a developing color and to start copying. This configuration is provided with a control device 20 that drives and controls the.

In the above problem solving means, in the copying procedure, after the operator sets the number of sheets using the sheet set, if a copy of the developing color set in the first developer tank 13 is required, the first dual-use By operating the switch 17, the first developer tank 13 is designated and copying is started. In other words, color selection and copy start can be performed in one operation, and since they can be performed simultaneously, it is possible to prevent copy errors due to color selection errors.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4. FIG. 1 is a plan view of the operation section of a copying machine showing an embodiment of the present invention, FIG. 2 is a block diagram of the configuration of the control device,
Fig. 3 is a block diagram of the developer tank switching device, and Fig. 4 is a control 70-
It is a chart. Components having the same functions as those of the conventional component shown in FIG. 5 are designated by the same reference numerals.

As shown in the figure, the copying machine includes a first developer tank 13, a second developer tank 14, and a third developer tank 15, which are arranged around a photoreceptor 12 of a copying machine main body 11 so as to be switchable between a developing position and a non-developing position. and a developer tank switching device 16 that switches one of the developer tanks 13, 14, 15 to a developing position and the other developer tanks to a non-developing position.

In this copying machine, the device for preventing erroneous selection of development colors includes a first dual-purpose switch 17 on the operation unit 5 of the main body 11 of the copying machine, which serves both to select the same number of development colors as the developer tank and to start copying;
A second dual-purpose switch 18 and a third dual-purpose switch 19 are provided, and a control device 20 is provided that drives and controls the developer tank switching device 16 based on the output signals of the respective dual-purpose switches 17 to 19.

As shown in FIG. 3, the developer tank switching device 16 switches and drives the first developer tank 13, the second developer tank 14, and the third developer tank 15 so that they can move closer to or away from the drum-shaped photoreceptor 12. , a switching drive section 16A for the first developer tank 13, a switching drive section 16B for the second developer tank 14, and a switching drive section 16C for the third developer tank 15. And each switching drive section 16
A to 16C are racks 21A, 21B, and 21C fixed to the upper or lower surface of each developer tank 13, 14, and 15, and a motor 22 that meshes with the racks 21A to 21C and can rotate in forward and reverse directions.
Binion 23A rotated by A, 22B, and 22C
, 23B, and 23C.

The motors 23A, 23B, and 23C are stopped by turning on microswitches or the like provided in the developing position and the non-developing position, respectively.

The dual-purpose switches 17 to 19 are push-on switches, and are arranged in parallel on the right side of the operating section 5, as shown in FIG. In addition, each dual-purpose switch 17 to 19 has an LE that can display a color to indicate that the switch is selected.
Display lamps 17A, 18A, and 19A such as D may be arranged in parallel.

The control device 20 has a function of switching and driving the first developing tank 13 to a developing position and the rest to a non-developing position by an ON signal of a first dual-purpose switch 17, and switching the second developing tank 13 to a non-developing position by an ON signal of a second dual-purpose switch 18. The third developing tank 15 is switched to the developing position and the rest to the non-developing position according to the ON signal of the third dual-purpose switch 19. There is.

Furthermore, in order to improve the start-up at the start of copying, the control device 20 may have a return function that returns the first developer tank 13 containing the main color toner to the developing position after a certain period of time has elapsed. good.

In FIG. 2, reference numeral 25 indicates a copying drive circuit (including exposure means, charging means, developing means, paper feeding means, transfer means, fixing means, static eliminating means, etc.). In the above configuration, after the operator sets the number of copies by setting the number of copies as part of the copying procedure, if a copy of the color set in the first developer tank 13 is required, the first dual-purpose switch 17 is operated.

Then, the first developer tank 13 is designated, and the control device 20
outputs a normal rotation signal for rotating the pinion 23A clockwise to the drive circuit of the motor 22A. As the binion 23A rotates, the rack 21A meshing with the binion moves forward, and the first developer tank 13 approaches the photoreceptor 3 and assumes a developing position. After that, a drive signal is output to the copy drive circuit 25, and copying starts. In other words, color selection and copy start can be performed in one operation, and since they can be performed simultaneously, it is possible to prevent copy errors due to color selection errors. Note that at this time, the control device 20 turns the first dual-purpose switch 17 ON.
In response to the signal, the motor 2 of the developer tank switching device 16 switches the second developer tank 14 and the third developer tank 15 to the non-developing position.
Outputs forward/reverse signals to 2B and 22C.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

For example, the developer tank switching device 16 is not limited to the one that moves the developer tanks 13 to 15 close to and away from the photoreceptor 12 as in the above embodiment, but can also be used to keep the developer tank fixed while switching the main pole of the developing roller (magnetic roller). It may also be something that changes the position. Further, in the above embodiment, a copying machine having three developer tanks has been described, but the present invention is not limited to this, and it goes without saying that the present invention can be applied to a copying machine having two or four or more developer tanks.

<Effects of the Invention> As is clear from the above description, in the present invention, the color selection switch and the copy start switch, which were conventionally installed separately, are integrated into one switch, so that the color selection and copy start switch are combined into one switch. This is possible by repeating the key operations twice, and since they can be performed simultaneously, it is possible to prevent the occurrence of erroneous copying due to color selection mistakes, and it has the excellent effect of simplifying key operations for the operator.

[Brief Description of the Drawings] Fig. 1 is a plan view of the operation section of a copying machine showing an embodiment of the present invention, Fig. 2 is a block diagram of the control device, and Fig. 3 is a block diagram of the developer tank switching device. , FIG. 4 is a control flowchart. FIG. 5 is a plan view of the operating section of a conventional copying machine. 5: Operation unit, 11: Copying machine main body, 12: Photoreceptor, 13:
First developer tank, 14: Second developer tank, 15: Third developer tank, 1
6: Developer tank switching device, 17: First dual-purpose switch, 18:
Second dual-purpose switch, 19: Third dual-purpose switch, 20: Control device.

Claims (1)

[Claims] A first developer tank and a second developer tank are arranged around the photoreceptor of the copying machine body so as to be switchable between a developing position and a non-developing position, and one of the developing tanks is in the developing position and the other is in the non-developing position. In a copying machine having a developer tank switching device that changes the orientation, a first dual-purpose switch and a second dual-purpose switch are provided in the operation section of the main body of the copying machine to select the same number of developer colors as the developer tank and to start copying. An apparatus for preventing incorrect selection of a developing color, further comprising a control device for driving and controlling the developing tank switching device based on the output signals of the respective dual-purpose switches.