JPH0532852Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a temperature control device for maintaining a photoreceptor at an appropriate temperature in an electrostatic copying machine or the like used in electrostatic recording.

<Prior art> Generally, in an electrostatic copying machine, a photoconductor having a photoconductor layer on its surface is used, and while the photoconductor is rotated, it is charged in a main charging section and then irradiated with an original image to generate static electricity. By forming a latent image, toner is attached to the electrostatic latent image, developed, and transferred to transfer paper at a transfer section to form a copy image. The quality of the copied image thus obtained depends on the sensitivity of the photoreceptor. That is, the sensitivity of the photoreceptor changes depending on its own temperature, making it difficult to obtain good copied images. Therefore, when using a photoreceptor having such temperature dependence, its temperature must be controlled.

Therefore, according to Japanese Patent Application Laid-Open No. 55-53377, as a method of controlling the temperature of the photoreceptor to a predetermined temperature, a heat source for heating the photoreceptor and a heat-sensitive element are provided adjacent to this heat source, and the heat-sensitive element is It has been proposed to install a temperature control means inside the photoconductor to control the energization of the heating source according to the detection signal of the photoconductor, and to control the temperature of the photoconductor by connecting the drive power source to the main body of the device only.

<Problems to be Solved by the Invention> The device having such a configuration controls the temperature of the photoreceptor based on the detection signal from only the heat-sensitive element. However, depending on the rotation state of the photoreceptor,
That is, the amount of heat dissipated from the photoreceptor differs between when the photoreceptor is stopped and when it is rotating, and this has not been addressed, resulting in the problem that the temperature of the photoreceptor cannot be accurately controlled.

<Purpose of the invention> In view of the above-mentioned problems, the present invention provides a photoconductor temperature control device that can detect the presence or absence of rotation of the photoconductor and accurately control the temperature of the photoconductor. It is something.

<Means for solving the problem> The present invention includes a heating means for heating a photoconductor, a temperature sensor for detecting the temperature of the photoconductor, a rotation detection sensor for detecting whether or not the photoconductor is rotating, and these two. When the photoreceptor is rotating, the amount of current applied to the heating means is increased according to the output signal from the two sensors, and when the photoreceptor is not rotating, the amount of current applied to the heating means is increased when the photoreceptor is rotating. A temperature control device for a photoreceptor, characterized in that an energization control circuit for controlling the temperature smaller than that of the photoreceptor is provided inside the photoreceptor, and a detected portion consisting of a black and white pattern is provided outside the photoreceptor, facing the rotation detection sensor. .

<Function> When the photoconductor is stationary, the rotation detection sensor detects one of the black and white patterns and outputs a stationary signal, and when the photoconductor is rotating, it detects either the black and white pattern and outputs a stationary signal. Each pattern is detected and a rotation signal is output.

The energization control circuit controls the amount of energization to the heater, that is, the temperature of the photoreceptor, according to the signal output as described above and the signal output from the temperature sensor.

<Examples> Examples will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a sectional view of a main part using a drum-shaped photoreceptor. The photoreceptor drum 1 consists of a cylindrical drum body 1' and a photoreceptor layer 1'' provided on its surface, and is connected between the front and rear side plates 31, 33 by front and rear flanges 20, 22 at both ends and a support rod 4. A heater 2, a temperature sensor 3, an energization control circuit 16, and a rotation detection sensor 21 are housed in the photosensitive drum 1. Note that there is a space between the front and rear flanges 20, 22 and the front and rear side plates 31, 33. A bearing 19 is interposed therebetween.Sliding brushes 26 and 27 are respectively attached to the front plate 31 via an insulator 30, and a lead wire 28 connected to a round terminal is connected to the power supply circuit 40 of the main body of the copying machine. Sliding brush 2 by 29
6 and 27. The sliding brush 26 is
A sliding brush 27 slides on a ground electrode 24 and a sliding ring 25, which will be described later. The ground electrode 24 and the sliding ring 25 pass through the front flange 20 and are connected to the connectors 10 and 11, respectively. The wired connectors 10 and 11 are connected to the connector 12 of the energization control circuit 16 through the lead wire 9. Note that the lead wire 9 is tied to the support rod 4 with a binding band 5. On the other hand, lead wires 6 are connected to the heater 2, a temperature sensor 3 attached closely to the heater 2, and a rotation detection sensor 21 provided on the rear flange 22, respectively.
7 and 8 are connected to an energization control circuit 16 via connectors 13, 14, and 15, respectively. The energization control circuit 16 is attached via a support 17 to a mounting plate 18 attached to the rear flange 22. A gear 23 is attached to the rear flange 22.
is provided, and the drive is transmitted from a drive motor (not shown) of the main body. On the rear side plate 33, facing the rotation detection sensor 21, there is a white part 32a as a detected part.
A black and white pattern 32 consisting of a black part 32b and a black part 32b is attached (see FIG. 3).

Next, the operation will be explained with reference to FIG. First, the power supply circuit 4 from the outside of the photoreceptor drum 1
0, electrodes are supplied to the energization control circuit 16 via the sliding brush 26 and the ground electrode 24, and the sliding brush 27 and the sliding ring 25, and the heater is activated based on the detection output signals of the temperature sensor 3 and the rotation detection sensor 21. The amount of electricity supplied to 2 is controlled. That is, when the photosensitive drum 1 is stationary, the rotation detection sensor 21 detects one of the black and white patterns 32 and outputs a stationary signal to the energization control circuit 16. Then, when the drive motor (not shown) of the main body transmits the drive to the gear 23 and the photosensitive drum 1 rotates, the rotation detection sensor 21 detects each pattern of the black and white pattern 32 and sends a rotation signal to the energization control circuit 16. Output.

In this way, the amount of electricity applied to the heater 2 from the electricity supply control circuit 16 is changed by the rotation detection sensor 21 depending on whether or not the photosensitive drum 1 is rotating. That is, when the photoreceptor drum 1 is rotating, the amount of current supplied from the energization control circuit 16 to the heater 2 is greater than when the photoreceptor drum 1 is not rotating.

<Effects of the invention> As described above, the present invention accommodates a heater, a temperature sensor, a rotation detection sensor, and an energization control circuit inside the photoreceptor, and provides a detection portion outside the photoreceptor facing the rotation detection sensor. Therefore, the number of electrical connections between the outside and the inside of the photoreceptor can be minimized, and noise in the detection signal can be suppressed. Furthermore, since the presence or absence of rotation of the photoreceptor can be detected with a simple structure, there is a practical effect that temperature control can be performed with high accuracy.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main part of the present invention, FIG. 2 is a block diagram of the present invention, and FIG. 3 is a front view of the rear plate to which a black and white pattern as a detected part is attached. 1...Photosensitive drum, 2...Heater, 3...Temperature sensor, 16...Electrification control circuit, 21...Rotation detection sensor, 32...Black and white pattern.

Claims (1)

[Scope of utility model registration request] A heating means for heating the photoconductor, a temperature sensor for detecting the temperature of the photoconductor, and a rotation detection sensor for detecting whether or not the photoconductor is rotating. An energization control circuit is installed inside the photoreceptor, which increases the amount of current applied to the heating means when the photoreceptor is rotating, and controls the amount of current applied to the heating means to be smaller when the photoreceptor is not rotating than when the photoreceptor is rotating. 1. A temperature control device for a photoreceptor, characterized in that a detection portion made of a black and white pattern is provided outside the photoreceptor, facing the rotation detection sensor.