JP2003300642A - Image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a recorded material from being damaged by stopping a motor of small inertia after an arbitrary time form the stop of a motor of large inertia in emergency stop, in an image forming device comprising a plurality of driving means, and one or a plurality of transporting means respectively driven by the plurality of driving means. <P>SOLUTION: In this image forming device comprising the plurality of driving means, and one or the plurality of transporting means respectively driven by the plurality of driving means, the motor of small inertia is stopped after the arbitrary time from the stop of the motor of large inertia in emergency stop. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention corresponds to desired image information by a developing material such as toner on a recording medium in an image forming process means section of an appropriate principle and method such as electrophotography, electrostatic recording, magnetic recording and the like. An image forming apparatus such as a printer, a copying machine, a recording machine, or a facsimile, which forms and carries the formed image by an indirect method or a direct method, and thermally fixes the image on a recording medium as a permanently fixed image to output an image formed product. .

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus such as a copying machine, a printer, a facsimile, a transfer material, a photosensitive paper, a static paper, An image is formed and carried on a recording material such as an electric recording paper or a printing paper by a transfer method or a direct method in accordance with target image information.

In the image forming apparatus adopting the transfer method, a thermal fixing device is used to thermally fix the unfixed toner image formed and carried on the recording material on the surface of the recording material. As a heat fixing device, a contact heating type device such as a heat roller type or a film heating type is widely used.

When a recording material conveyed by a plurality of driving means and a plurality of conveying means causes a conveyance failure for some reason, a CPU which controls the conveyance of the recording material.
Detects a conveyance failure and stops a plurality of driving means for driving a plurality of conveyance means at the same time.

[0005]

In the above-mentioned conventional example, since a plurality of driving means are stopped at the same time, when the recording material is conveyed by a plurality of conveying means having different driving means, the inertia of the driving means is different. As a result, there is a possibility that the recording material being conveyed may be stretched and damaged.

Therefore, an object of the present invention is to provide a plurality of driving means and an image forming apparatus in which the plurality of driving means respectively drive one or a plurality of conveying means, by stopping a motor having a large inertia in an emergency stop. It is to prevent damage to the recording material by stopping the motor with less inertia after an arbitrary time from.

[0007]

According to the first invention of the present application, the object is to stop the motor having a small inertia after an arbitrary time after stopping the motor having a large inertia during an emergency stop. To be achieved.

According to a second invention of the present application, the above-mentioned object is, in the above-mentioned first invention, that the motor with a large inertia is stopped after the motor with a large inertia is stopped according to the rotation speed of the drive means. This is achieved by varying the time to stop.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments 1 to 2 below solve the above problems.

(Embodiment 1) FIG. 1 is a schematic configuration diagram of an image forming apparatus of this embodiment. In FIG. 1, 104 is a photosensitive drum made of an organic photosensitive member or an amorphous silicon photosensitive member, and has a predetermined peripheral speed (process speed) in the clockwise direction.
Is driven to rotate. This rotating photosensitive drum 104
The peripheral surface of the charging roller 105 is uniformly charged to a predetermined polarity and potential. Then, corresponding to the time series electric digital pixel signal of the target image information output from the laser optical box 108 and input from an image signal generating device (not shown) such as an image reading device or a computer on the charged surface. The modulated (on / off converted) laser light is changed and emitted by the laser light reflection mirror 109, so that scanning exposure is performed and an electrostatic latent image corresponding to image information is formed.

The electrostatic latent image thus formed corresponding to the target image is developed by the developing device 106.

Next, one recording material is fed from the paper feeding cassette 103 to the photosensitive drum 104 by the paper feeding roller 102, so that a mirror image of the recording material on the photosensitive drum 104 side. A toner image is formed. The transfer roller 107 transfers a toner image from the photosensitive drum 104 to the recording material by supplying a charge having a polarity opposite to that of the toner from the back surface of the recording material. The recording material on which the toner image has been transferred in this manner is separated from the photosensitive drum 104 and sent to the thermal fixing device 110, where the heater 1
The toner image is thermally fixed by 11.

The recording material having undergone heat fixing is conveyed by a FU roller 112 driven by a DC brushless motor and an FD roller 113 driven by a stepping motor having a smaller inertia than the DC brushless motor, and a paper discharge tray 114. Is discharged to.

The stepping motor is an FD
The roller 113 is driven, and the DC brushless motor mainly drives the paper conveying means other than the FD roller 113.

FIG. 2 is a block diagram of the control system. When the conveyance failure occurs for some reason, the CPU 203, which controls the conveyance of the recording material, detects the conveyance failure based on the information from the sensors S1 to S4. When the CPU 203 detects a paper conveyance defect, the CPU 203 stops the DC brushless motor 204 through the drive circuits 201 and 202, and stops the stepping motor 205 after an arbitrary time T.

Here, the arbitrary time T means the DC brushless motor 20 when the recording paper is conveyed by both the FU roller 112 and the FD roller 113.
4 and the stepping motor 205 is a time that can be stopped without damaging the recording paper in consideration of the difference in conveyance distance of the recording paper due to inertia after stopping.

With the control as described above, in the image forming apparatus in which the plurality of driving means and the plurality of driving means respectively drive one or a plurality of conveying means, due to the difference in inertia of the driving means, the conveyance is being performed. It is possible to prevent damage to the recording material such as stretching of the recording material.

(Embodiment 2) In Embodiment 1, regardless of the number of rotations of the motor, after the DC brushless motor 204 is stopped, the stepping motor 2 is stopped after an arbitrary time T.
05 was stopped. In this embodiment, the arbitrary time T is varied according to the rotation speeds of the DC brushless motor 204 and the stepping motor 205.

By the control as described above, even in the image forming apparatus in which the plurality of driving means and the plurality of driving means respectively drive one or a plurality of conveying means, even when the rotation speed of the driving means is variable. Due to the difference in inertia of the driving means, damage to the recording material such as stretching of the recording material being conveyed can be prevented.

[0020]

As described above, the first aspect of the present application
According to the second aspect of the invention, in the image forming apparatus in which the plurality of drive units and the plurality of drive units respectively drive the one or the plurality of transport units, after stopping the motor having a large inertia during an emergency stop, By stopping the motor with low inertia after an arbitrary time, it is possible to prevent damage to the recording material.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of an image forming apparatus of the present invention.

FIG. 2 is a block diagram of a control system of the present invention.

[Explanation of symbols]

101 image forming apparatus 102 paper feed roller 103 paper feed cassette 104 photosensitive drum 105 charging roller 106 developing device 107 transfer roller 108 Laser Optical Box 109 Laser light reflection mirror 110 heat fixing device 111 heater 112 FU roller 113 FD roller 114 output tray 115 FU tray

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Claims (2)

[Claims] 1. An image forming apparatus in which a plurality of driving means and each of the plurality of driving means drive one or a plurality of conveying means, and after an arbitrary time after stopping a motor having a large inertia in an emergency stop. An image forming apparatus characterized by stopping a motor having a small inertia. 2. The image forming apparatus according to claim 1, wherein the time from stopping the motor having a large inertia to stopping the motor having a small inertia is variable according to the rotation speed of the driving unit. Image forming apparatus.