JPS62273533A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent a photosensitive material from being contaminated, by providing a timer which controls a fixed time and a controlling means which switches a switching means by using the ON signal of a power supply switch depending upon the state of the timer whether or not the timer controls a fixed time. CONSTITUTION:Two cases are considered when a power supply switch 205 is turned on. One case is that the time since the power supply switch 205 is turned off at the last time exceeds the controlling time of a timer 204 which controls the time since the switch 205 is turned off and the other is that the time does not exceeds the controlling time. Since it is estimated when the time exceeds the controlling time that deposited and crystallized materials adhere to carrying rollers and guide members inside and outside a liquid, a controlling means 206 switches the paper feed means to the 2nd paper feeding means 202 and feeds cleaning paper. After confirming the completion of cleaning, the controlling means 206 switches a switching means 203 to the 1st paper feeding means 201 and feeds a photosensitive material. In case where the time does not exceed the controlling time, the controlling means 202 assumes that the materials do not adhere to the rollers and members and feeds the photosensitive material by switching the switching means to the 1st paper feeding means 201. Since the deposited materials, etc., adhering to the rollers are transferred to the cleaning paper in such way, the photosensitive material is prevented from being contaminated at the time of actual operation.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] This invention exposes original information obtained from an original placed on a glass platen onto a photosensitive material such as photographic film or photographic paper. death,
The present invention relates to an image forming apparatus in which the exposed photosensitive material is sequentially passed through processing liquid tanks installed according to a development process for development processing.

[Background of the invention]

Generally, this type of image forming apparatus is equipped with a plurality of processing liquid tanks for developing the exposed photosensitive material, and each of these processing liquid tanks includes submerged transport rollers and guide members that sandwich the photosensitive material in the liquid. In addition, there are also provided a conveyor roller and a guide member outside the liquid to transfer the photosensitive material to the next tank outside the liquid. If these submerged transport rollers and guide members are left in the solution for a long time (5 to 24 hours, depending on the solution temperature) without being subjected to development processing, precipitates will accumulate on them, and the submerged transport rollers and guide members will In the case of rollers and guide members, the processing liquid adhering to them oxidizes and becomes crystallized.

There is an inconvenience that the precipitates and crystals adhering to the transport rollers and guide members inside and outside the liquid are transferred as stains to the front and back sides of the photosensitive material when the next paper is fed. Copies with such stains are essentially treated as defective products.

All efforts were made in vain.

[Object of the Invention] In view of the above points, the present invention provides a method for solving problems in the case where the development process is not carried out for a period longer than the time period during which it is expected that precipitates or crystals will adhere to the conveyance roller or guide member in or out of the liquid. To provide an image forming apparatus in which a cleaning paper is passed through prior to feeding the next photosensitive material, and deposits and crystals are transferred and removed to prevent the photosensitive material from being contaminated during the second printing.

[Structure of the invention]

In order to achieve the above object, the present invention provides a photosensitive material feeding means, a cleaning paper feeding means, and a switching means for switching the driving of these.

The apparatus is configured to include a timer for managing a fixed time and a control means for switching the switching means according to an on signal from a power switch depending on whether the timer is within or outside the time managed by the timer.

〔Example〕

Next, the present invention will be described based on embodiments shown in the accompanying drawings. Note that this invention is not limited to the embodiments described here.

FIG. 1 is a schematic sectional view of an image forming apparatus according to the present invention. In this figure, 10 is an image exposure section, 20 is a paper feed section,
30 is a transport section, 40 is a development processing section, and 50 is a drying section.

The image exposure section 10 includes an original table glass 11. Light source 12. First mirror 13. Second mirror 14. Third mirror 15. It includes a lens 16 and a shutter 17. A first scanning unit consisting of the light source 12 and the first mirror 13 moves parallel to the document table glass 11 to expose and scan the document, and a second scanning unit consisting of the second mirror 14 and the third mirror 15 moves. It is mounted on a table and is configured to move in the same direction as the first uni-nod and at half the moving speed of the first scanning unit. This image exposure section 10 is similar to that used in known electrophotographic copying machines, but uses an odd number of mirrors to invert the image and expose a latent image corresponding to the original image. It is designed to be formed directly on the photosensitive surface of the material. The shutter 17 opens the exposure window 37 in synchronization with the exposure scan.

The other portions are closed late to prevent light from leaking into the eight sending portions 30.

The photosensitive material used in this invention is preferably a silver halide photographic material for obtaining a high quality copy image (color or black and white) in which a positive image is formed by a development process after exposure. It is also applicable to light-sensitive materials other than photographic light-sensitive materials. Such a silver halide photographic light-sensitive material may be, for example, an internal latent image type or other direct reversal type silver halide photographic material, or a versatile type (reversal development type); The material support (base) may be opaque paper or the like or a transparent film.

The paper feeding section 20 is a paper feeding means for photosensitive material (first paper feeding means).
201, and cleaning paper feeding means (second paper feeding means) 202. The first paper picking means 201 is detachably installed with a magazine 21 storing a photosensitive material wound in a roll shape, and also has a pull-out roller 23 for pinching and drawing out the photosensitive material from the magazine 21, and a drawer roller 23 for holding and drawing out the photosensitive material from the magazine 21. The second paper picking means 202 is also equipped with a magazine 21' in which cleaning paper is wound and stored in a roll, and is detachably installed therein. It is equipped with a pull-out roller 23' that pinches and pulls out the sheet, and a cutting device 24' that cuts the sheet into a predetermined length.

The conveying section 30 includes a path 34 having conveying rollers 31, 32, and 33 for photosensitive material cut into a predetermined length, and a first Akiemulator 35 provided above the path 34 for once winding up and storing the photosensitive material. and a second accumulator 36 provided below the path 34.

Note that a supply path 341 for cleaning paper drawn out from the second paper feeding means 202 communicates with the path 34 .

The conveying rollers 31 to 33 are capable of forward and reverse rotation, and after conveying the photosensitive material sent from the paper feed section 20 to the first accumulator 35, they are reversed once and sent to the second accumulator 3.
This second accumulator 36 is lowered toward 6.
The photosensitive material is transported to the exposure window 3 of the image exposure section 10.
7, during which the original image is exposed. Therefore, the speed of the photosensitive material during this downward movement is synchronized with the light source scanning speed. Note that there is no need to carry out image exposure when conveying the cleaning paper; therefore, the exposed photosensitive material accommodated in the second accumulator 36 is again accommodated in the first accumulator 35 by the conveyance rollers 31 to 33. By switching a switching claw 38 provided in the middle of the path 34, the material is guided to a path 34' communicating with the development processing section 4o, and is sent to the development processing section 40 by a conveyance roller 39 provided in the path 34'.

The development processing section 40 has a housing 40 that can be pulled out from the main body of the apparatus.
'A first developer tank 41A, a second developer tank 41B, a bleach-fix tank 41C, and a first stabilizer tank 41D.

Each processing liquid tank of the second stabilizing tank 41E is provided.

A guide roller 42 is provided at the entrance of the first developing tank 41A to guide the photosensitive material fed into the tank by the conveying roller 39 provided in the passage 34'.

The photosensitive material guided to the first developing tank 41A is transported by a plurality of groups of submerged transport rollers 44- provided in a passage 43 filled with processing liquid.
The photosensitive material discharged from the second developing tank 41B is then sent to the bleach-fixing tank 41C via a passing roller 45 provided outside the solution, and is similarly transferred to the bleach-fixing tank 41C.
1C to the first stabilizing tank 41D, from the first stabilizing tank 41D to the second stabilizing tank 41E, and after passing through the final tank 41E and completing all the development processing steps, the photosensitive material is conveyed by a conveying roller 46 provided at the outlet thereof. It is then sent to the drying section 50.

In this drying section 5.degree., the photosensitive material is sandwiched between a conveyance roller 51 and a conveyance wire 52, and its upper and lower surfaces are dried with warm air by a hot air dryer 53, and then discharged to the outside of the machine through a discharge roller 54.

FIG. 2 shows a first paper feeding means 2 which is a paper feeding means for the photosensitive material.
In FIG. 1, which is a block diagram for controlling the driving of the second paper feeding means 202, which is the paper feeding means for cleaning paper, 203 indicates the first paper feeding means 201 and the second paper feeding means 2.
The switching means 204 of 02 is submerged in liquid for a certain period of time 9, for example, from when the power switch 205 is turned off until the next time it is turned on.

A timer that manages the time (set within a range of 5 to 24 hours) during which precipitates and crystals are expected to adhere to the transport roller and guide member outside the liquid.

Reference numeral 206 denotes a control means that switches the switching means 203 according to an on signal when the power switch 205 is turned on, depending on whether it is within the management time of the tie'P-204 or outside one hour.

That is, when the power switch 205 is turned on, there are two cases: (1) the time managed by the timer 204, which manages the time since the last time the power switch 205 was turned off, has exceeded, and (2) the time has not yet exceeded. be. In case (3), it is predicted that sediment or crystals are attached to the conveying roller or guide member in or outside the liquid, so the control means 206 switches the switching means 203 to the second paper feeding means 202. When the cleaning paper is fed and the end of the feeding of the cleaning paper is detected by the end detector 207 and the control means 206 receives the detection signal, the switching means 20
3 is switched to the negative paper feeding means 201 to feed the photosensitive material. In the case of (2), it is assumed that no precipitates or crystals have adhered yet, and the control means 206 switches the switching means 203 to the -
The paper feeding means 201 is switched to feed the photosensitive material.

〔Effect of the invention〕

As explained above, the present invention includes a photosensitive material feeding means, a cleaning paper feeding means, a switching means for switching the driving of these, a timer for managing a certain time, and a control time for controlling the time of the timer. The invention is characterized in that it is provided with a control means that switches the switching means in response to an on signal from a power switch, so that it is possible to prevent deposits or crystals from adhering to the conveyance roller or guide member outside the liquid for 7 days or more. If the developing process has not been performed before, a cleaning paper is passed through the photosensitive material before feeding the next photosensitive material. Therefore, since the precipitates and crystals adhering to the roller are transferred to the cleaning paper, there is an excellent effect that stains do not adhere to the photosensitive material in one run.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of an image forming apparatus of the present invention, and FIG.
The figure is a block diagram of a control system for the first and second sheet feeding means. lO--Image exposure section 20...Paper feeding section 30--Transportation section 40--Development processing section 201-Photosensitive material paper feeding means (first paper feeding means) 202.
- Cleaning paper feeding means (second paper feeding means) 2Q3 - Switching means 204 - Timer 205 - Power switch 206 - Control circuit 207 - End detector

Claims (2)

[Claims] (1) A feeding means for photosensitive material, a feeding means for cleaning paper, a switching means for switching the drive of these, a timer for managing a certain time, and an on signal for the power switch depending on whether the timer is in or out of the managed time. An image forming apparatus comprising: a control means for switching the switching means. (2) The image forming apparatus according to claim 1, wherein the timer manages the time from when the power switch is turned off until the next time it is turned on.