JPS62231272A - Copying machine - Google Patents

Abstract

PURPOSE:To enable dehumidification without providing any dehumidifier by carrying the specific number of sheets of transfer paper in an auxiliary container temporarily from a transfer paper container through a fixing device and then carrying them out to a transfer part when the heating temperature of the fixing device is higher than specific temperature, and performing a transferring and a fixing process and then discharging the sheets. CONSTITUTION:A main motor 33 and a heater 23 for fixation are turned on with a power switch and when the specific number of sheets to be copied is set on a keyboard 32, a temperature sensor 24 detects the temperature T of a fixing roller. When the temperature T rises above the set temperature t1 at which transfer paper can be dehumidified, clutches 34, 35, 37, and 40 turn on to move a changeover piece 28, transfer paper is carried from the container 15 over a blank copying process, dehumidified by a fixing roller 23, and carried in the auxiliary container 25, and then the changeover clutch 37 turns off to move the changeover piece 28. Thus, the transfer paper is dehumidified by the fixing roller by the blank copying before copying operation and then a copy is taken, so any special dehumidifier need not to be provided and the electric power for the dehumidification is saved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention allows the moisture content of transfer paper to be reduced to g! The present invention relates to a copying machine that performs a transfer operation after alignment.

(B) Conventional technology Conventionally, the causes of transfer defects in copying machines include deficiencies in the conveyance path and transfer/separation charges, irregularities in the transfer paper (for example, curls), and water content in the transfer paper, among others. Transfer paper with high moisture content is a source of extremely poor transfer.

Therefore, a copying machine has been proposed in which a transfer paper dehumidifying device is installed in the copying machine to adjust the moisture content of the transfer paper (for example, JP-A-59-2110!i7
(see publication).

(c) Problems to be solved by the invention However, when a dehumidifying device is installed in a copying machine, it is installed between the transfer paper container and the photoreceptor, so the photoreceptor may be heated and adversely affected. , the entire copying machine tends to become longer, which is not preferable.

This invention was made in consideration of these circumstances,
The purpose of the present invention is to provide a copying machine that can dehumidify transfer paper by utilizing the heating action of a fixing device, especially without providing a dehumidifying device.

(d) Means for Solving the Problems This invention develops an electrostatic latent image formed on a photoreceptor by an exposed image from an original using a developing device, and transfers the image onto transfer paper conveyed from a transfer paper container. In a copying machine configured to heat and fix the transfer paper with a fixing device after transfer and discharge it, there is an auxiliary container that temporarily stores the transfer paper, and a fixing S! carrying means for selectively carrying the transfer paper sent out from the storage unit to the auxiliary B unit;
A conveyance means for conveying the transfer paper from the auxiliary container to the transfer section of the photoreceptor, a switching means for switching the transfer paper sent out from the fixing device to be either discharged to the outside or conveyed to the auxiliary container, and heating of the fixing device. A detection means outputs when the temperature is above a predetermined value, and when the heating temperature of the fixing device is above a predetermined value, a predetermined number of transfer sheets are transported from the transfer paper container to the auxiliary container via the fixing device, and then transferred to the transfer section. A copy e characterized by comprising a control unit for carrying out, transferring, fixing and discharging the copy.
There is at'.

(E) Effect When the heating temperature of the fixing device is detected by the detection means and is equal to or higher than a predetermined value, the transfer paper is conveyed to the fixing device without being transferred (in the state of a blank copy). Then, it is heated and dehumidified by the fixing device, and transported to the auxiliary container by the switching means and the transporting means.

The conveyed transfer paper is conveyed to the transfer section by the conveyance means, transferred from the photoreceptor, fixed, and discharged.

(f) Examples The present invention will now be described in detail based on examples shown in the drawings. Note that this invention is not limited to this.

FIG. 1 is a configuration explanatory diagram showing an embodiment of the present invention, in which 1 is a document U mounting table, 2 is a document cover, and 3 is an arrow a, a'.
4 is an exposure lamp; 5 is a mirror that moves together with the exposure device 3 and reflects the light reflected from the document; 6°7 is linked to the exposure device 3;
1 is a mirror that moves at a speed of 2; 8 is an imaging lens; 9 is a fixed mirror; 10 is an image light; 11 is a photosensitive drum that rotates in the direction of arrow C and forms an electrostatic latent image with the image light 10;
2 is a main channel [2] that charges the photoreceptor drum 11 uniformly.
13 is a developing device that develops the electrostatic latent image on the photosensitive drum 11; 14 is a cleaning device that cleans the surface of the photosensitive drum 11; 15 is a transfer paper container; 16 is a delivery roller that sends out the transfer paper; , 11 is a transfer paper conveyance roller, 18
19 is a registration roller, 19 is a transfer charger, 20 is an ACC charger that makes the transfer paper <+1 m from the photosensitive drum 11, 21 is a conveyance belt, 22 is a fixing roller, 23 is a fixing heater, and 24 is a temperature of the fixing roller 22 25 is an auxiliary container, 25a is a transport roller, 26 is a carry-in path to the auxiliary container, 27 is a carry-out path from the auxiliary container to the registration rollers 18, and 28 is a discharge path for the transfer paper sent out from the fixing roller 22. A switching piece 30 that switches between discharging the paper to the rollers 29 and carrying it into the carry-in path 26 is a tray that accommodates the discharged transfer paper.

FIG. 2 is a block diagram showing the control circuit of FIG.
31 is a microcomputer with built-in ROM, RAM, CPU, I10 board, etc., 32 is a keyboard,
33 is a main motor, 34 is an electromagnetic rod for rollers that connects the conveyor belt 21, fixing roller 22 and discharge roller 29 to the main motor 33, and 35 is a registration roller 1.
8 is an electromagnetic clutch for the registration roller that connects the main motor 33; 36 is an electromagnetic clutch for developing light that connects the photoreceptor 11 and the developing roller of the developing device 13 to the main motor; and 31 is a conveyor that activates the switching piece 18. 38 is an optical system motor that moves the exposure device 3 and mirror 6.7; 39 is a charger driver that supplies high voltage for discharging to the main charger 12, transfer charger 19 and AC charger 20; 40 is an electromagnetic latch for the delivery roller that connects the delivery roller 16 and the conveyance roller 11 to the main motor 33, and 41 is an electromagnetic clutch for the delivery roller that connects the delivery roller 25a to the main motor 33.

FIG. 3 is a flowchart showing the main parts of the operations in FIGS. 1 and 2. First, in step 101, when the power switch (not shown) of the copying machine is turned on, the main motor 33 and the fixing heater 23 are turned on. Then, when the predetermined number of copies to be made is set using the keyboard 32 (step 102), the temperature of the fixing roller is detected by the 4 degree sensor 24. When the temperature T reaches the set temperature [1] or more at which the transfer paper can be dehumidified (step 103), the clutches 34, 35, 37° 40 are turned on, the switching piece 28 moves to the position indicated by the broken line, and the transfer paper is moved to the container 15. After being conveyed as a blank copy, dehumidified by the fixing roller 23, and conveyed to the auxiliary container 25 (step 104), the conveyance switching clutch 31 is turned off and the switching piece 28 moves to the position shown by the solid line.

When the temperature detected by the temperature sensor 24 reaches the fixing temperature 2 (step 1os), the clutches 34, 35.
36°38, 41J5 and motor 38, driver 39,
Since the exposure lamp 4 is sequentially turned on and off in accordance with the copying operation, the transfer paper is transferred to the delivery path 21 by the delivery roller 25a.
from the photosensitive drum 1 to the registration roller 18.
1 is transferred and fixed by the fixing roller 22, and then discharged to the tray 30 via the discharge roller 29 (step 106).

In this way, before the copying operation, the transfer paper is dehumidified by the fixing roller by blank copying and then copied.

In this embodiment, in J3, the dehumidifying temperature t1 of the fixing roller is detected from the temperature sensor 24.
Instead, a timer may be provided to measure a predetermined time when the power switch is turned on, and it may be determined that the fixing roller has reached a dehumidifying temperature after the predetermined time has elapsed.

(G) Effects of the Invention According to this invention, since the copying operation is performed after the transfer paper is heated and dehumidified at a constant temperature of 40°C, there is no need to provide a special dehumidification device, and the copying machine is miniaturized. Electricity for dehumidification is saved.

[Brief explanation of drawings]

FIG. 1 is a configuration explanatory diagram showing one embodiment of the present invention, FIG. 2 is a block diagram showing the control circuit of FIG. 1, and FIG. 3 is a flowchart showing the operations of FIGS. 1 and 2. 15... Transfer paper container, 22... Fixing roller, 23... Fixing heater, 24...
...m1t-sensor, 25...auxiliary container,
25a...Carry-out roller, 26...Carry-in path, 27...Carry-out path, 28...
...Switching piece. Figure 2 Figure 3

Claims (1)

[Claims] 1. After developing an electrostatic latent image formed on a photoreceptor by an exposed image from a document using a developing device and transferring the image to a transfer paper conveyed from a transfer paper container, the transfer paper is In a copying machine configured to heat and fix the transfer paper in a fixing device and then discharge the transfer paper, the copying machine includes: an auxiliary container for temporarily storing the transfer paper; a carrying means for selectively carrying the transfer paper sent out from the fixing device into the auxiliary container;
A conveyance means for conveying the transfer paper from the auxiliary container to the transfer section of the photoreceptor, a switching means for switching the transfer paper sent out from the fixing device to be either discharged to the outside or conveyed to the auxiliary container, and heating of the fixing device. A detection means outputs when the temperature is above a predetermined value, and when the heating temperature of the fixing device is above a predetermined value, a predetermined number of transfer sheets are transported from the transfer paper container to the auxiliary container via the fixing device, and then transferred to the transfer section. 1. A copying machine characterized by comprising a control means for carrying out, performing transfer and fixing processing, and ejecting the machine.