JP2001005158A - Heat developing type diazo copying machine and developing temperature control method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of an insufficient developing on the last half of a photosensitive paper, even in the case of using a photosensitive paper whose passing length is long, in a heat developing type diazo copying machine. SOLUTION: An original ejection detecting sensor 32 and a re-insertion detecting means 41 as photosensitive paper detecting means are arranged in front of a heat developing part, and when the photosensitive paper 12 is detected by the sensor 32 and the means 41, the heat generating body 46 of the heat developing part is controlled by a temperature control means 50 so that the heat generating amount may become nearly the maximum, then, the body 46 is controlled while the temperature is monitored by a temperature detecting means 48, and the temperature control range of a developing drum 43, is switched from a 1st temperature control range to a 2nd temperature control range which is higher than the 1st temperature control range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which a diazo photosensitive paper is superimposed on an original, inserted into a machine and exposed in an exposure unit.
After a latent image corresponding to the original image is formed on photosensitive paper, the original is separated and only the photosensitive paper is placed in the heating and developing unit, where it is heated to visualize the latent image and discharged out of the machine. It relates to a diazo copying machine.

[0002]

2. Description of the Related Art In a copying machine of this type, if development is carried out at a low temperature in a heating and developing section, development becomes insufficient, and a latent image is not sufficiently developed and color development becomes light. Conversely, when development is carried out at a high temperature, the color-forming components are thermally decomposed and the color development becomes thin, so that an appropriate density cannot be obtained. For this reason, in the heating and developing section, 130 to
It is necessary to carry out development at a temperature suitable for development of a photothermographic paper of 150 ° C.

[0003] Therefore, in such a copying machine, conventionally, a developing drum for heating a photosensitive paper after exposure to develop a latent image into a visible image,
The heating unit includes a heating element for heating the developing drum, a heating and developing unit having a temperature detecting unit for detecting the temperature of the developing drum, and a temperature control unit for controlling the heating element while monitoring the temperature of the developing drum with the temperature detecting unit.

The heating element is controlled by the temperature control means while monitoring the temperature of the developing drum by the temperature detecting means, so that the developing drum is always controlled to have a constant surface temperature.
For example, as shown in FIG.
° C.

[0005]

However, in the conventional developing temperature control method, when developing a photosensitive paper having a long paper passing length, for example, in a case where photosensitive paper having a size of A1 is passed vertically, for example, when the photosensitive paper is developed. The paper deprives the heat, and the surface temperature of the developing drum rapidly decreases as shown in (b) at the bottom of FIG.

At this time, even if the temperature detection means detects the surface temperature of the developing drum and starts energizing the heating element, there is a time lag until the developing drum actually warms up. As shown in (c) in the lower part of FIG. 3, the developing temperature range suitable for the heat-developable photosensitive paper was interrupted, and the development was insufficient in the latter half of the photosensitive paper in some cases.

It is an object of the present invention to prevent shortage of development in the latter half of photosensitive paper even in the case of photosensitive paper having a long paper passing length.

[0008]

Therefore, in order to attain the object, a thermal developing type diazo copying machine, which is a first means, heats a heat-developable photosensitive paper after exposure and forms a latent image formed on the photosensitive paper. A developing drum for visualizing an image, a heating element for heating the developing drum, a heating and developing unit having a temperature detecting means for detecting the temperature of the developing drum, and a photosensitive unit provided in front of the heating and developing unit to detect photosensitive paper When the photosensitive paper is detected by the photosensitive paper detecting means, the heating element is controlled while monitoring the temperature by the temperature detecting means, and the developing drum is moved from the first temperature control range to a second higher temperature range. Temperature control means for switching to a temperature control range.

Here, when the photosensitive paper comes into contact with the developing drum, it is preferable that the heating element has a substantially maximum heating value. In addition, it is preferable to provide a normal conveyance detecting means for detecting a document separated from the photosensitive paper after the exposure, and to use the normal conveyance detecting means as the photosensitive paper detecting means, and re-feed the photosensitive paper discharged outside the machine after the exposure. It is preferable to provide a re-insertion opening for the photosensitive paper, and to provide a re-insertion detecting means at the re-insertion opening for the photosensitive paper to detect the re-feeded photosensitive paper, and use the re-insertion detecting means also as the photosensitive paper detecting means.

A second means, a developing temperature control method for a heat developing type diazo copying machine, is such that when a photosensitive paper is detected by a photosensitive paper detecting means provided in front of a heating developing section, the developing means of the heating developing section is detected by the temperature detecting means. The heating element of the heating and developing unit is controlled by the temperature control means while monitoring the temperature of the drum, and the developing drum is switched from the first temperature control range to a second temperature control range higher than the first temperature control range. And

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the arrangement of each part of a diazo copying machine according to the present invention.

The diazo copying machine according to the present invention comprises, for example, a table section A, an exposure section B, a separation section C, a transport section D, and a heat development section E, as shown in FIG.

In the diazo copying machine according to the present invention, as shown in FIG. 2, the superposed paper 14 in which the original 10 and the photosensitive paper 12 are overlapped is placed on the table 20 with the original 10 facing upward.
It is placed on the top, guided by the table 20, and inserted into the exposure unit B.

At this time, the superposed paper 14 is detected by the detecting means 21, and a drive roller 22 is driven by operating a motor (not shown) to rotate the endless belt 25 while the pulling roller 23 and the idler roller 24 are respectively driven and rotated. When driven, the cylinder glass 26 rotatably supported by rollers (not shown) is rotated counterclockwise. Further, the superposed paper 14 is detected by the detecting means 2.
When the detection is made in step 1, the exposure fluorescent lamp 27 supported by a support member (not shown) is turned on.

Then, the polymerized paper 14 is transferred to the cylinder glass 26.
Between the endless belt 25 and the endless belt 25, irradiating the light with the fluorescent lamp 27 for exposure and applying the light transmitted through the original 10 to the photosensitive paper 12 while forming a latent image on the photosensitive paper 12 based on the image of the original 10. The conveyed paper 14 is conveyed with the rotation of the cylinder 26 and the endless belt 25.

The exposed polymerized paper 14 is separated from the cylinder glass 26 by a pickup plate 28 whose tip is pressed against the cylinder glass 26 by urging means (not shown).

When the separation switching lever 29 is automatically switched to bring the automatic manual separation switching plate 30 to the illustrated position, the exposed polymerized paper 14 is shifted between the pair of rollers 31.

Due to the speed difference between the two shift rollers 31, the photosensitive paper 12 on the high-speed shift roller 31a leads the original 10 on the low-speed shift roller 31b by about 1 cm.

The document 10 is discharged outside the machine by operating the filler 32a of the document discharge detection sensor 32. The document discharge detection sensor 32 is a normal conveyance detection unit that also serves as a photosensitive paper detection unit.

On the other hand, the photosensitive paper 12 is moved by pushing the leading end of the photosensitive paper 12 into the notch of the separation claw 33 and pushing the actuator 34. Thus, the rotation stopper of the separation claw 33 is removed, and the separation claw 33 is rotated to feed the photosensitive paper 12 to the transport section D.

The photosensitive paper 12 sent to the transport section D is guided by a guide plate 35 and is put between the relay transport roller pair 36.

When the original 10 operates the above-described filler 32a of the original discharge detection sensor 32, the developing unit insertion prevention switching plate 37 is rotated from the illustrated position by a rotating means (not shown) to open the transport path. , Relay conveyance roller pair 36
The photosensitive paper 12 that has exited from the printer enters the heat developing section E.

However, when the original 10 does not operate the above-described filler 32a of the original discharge detection sensor 32, the original 10 and the photosensitive paper 12 are not normally separated by the separating section C, and the original 10 is transferred to the transport section D. Is determined to have been sent to
The transport path is closed while the developing unit insertion prevention switching plate 37 remains at the position shown in the figure, and the photosensitive paper 12 that has exited the relay transport roller pair 36 is U-turned without being sent to the heating and developing unit E, and is discharged out of the machine through the front discharge port 38. Discharge to

In the illustrated copying machine, when the document 10 is extremely thick or thin, when the photosensitive paper 12 is a film system such as the second original drawing photosensitive paper, or when the size of the document 10 and the photosensitive paper 12 are different. When the automatic separation is performed in the separation section C, a separation failure may occur and the document 10 may be damaged.

If there is a possibility of such a situation, the separation switching lever 29 is manually switched, the automatic manual separation switching plate 30 is rotated from the illustrated position, and the exposed polymerized paper 14 is displaced to the roller pair 31. Discharge outside the machine without passing through.

When the overlapped paper 14 is discharged from the front discharge port 38 without being completely separated, or when the overlapped paper 14 is discharged out of the machine for manual separation, the user separates the original 10 from the original 10. The photosensitive paper 12 only,
Reinsert from 0 into the machine. When the re-insertion is detected by the re-insertion detection means 41, the developing unit insertion prevention switching plate 37
Is rotated from the position shown in the figure, and guided by the guide plate 42 between the relay conveyance roller pair 36 to enter the heating and developing unit E.

The photosensitive paper 12 that has entered the heating and developing section E is guided between the developing drum 43 and the nip roller 44, and the developing drum 43 is rotated by the rotation of the nip roller 44 to enter between the conveying guide sheet 45. The rotation of the developing drum 43 and the nip roller 44 guides the developing drum 43 between the other nip roller 44 and the conveyance guide sheet 45.

In the meantime, heat is applied by the developing drum 43 heated to a predetermined temperature by the heating element 46 to develop the latent image on the photosensitive paper 12. Then, the sheet is separated from the developing drum 43 and discharged outside the machine, and is stacked on a sheet discharge tray 47.

When the rear end of the photosensitive paper 12 passes through the heating and developing unit E, the developing unit insertion prevention switching plate 37 is returned to the illustrated position.

In the present invention, the heating element 46 is controlled by the temperature control means 50 while always monitoring the surface temperature of the developing drum 43 by the temperature detecting means 48. As shown in FIG. 43 surface temperature to 134
It is a first temperature control range of up to 140 ° C.

However, when the original 10 is detected by the original discharge detection sensor 32 also serving as a photosensitive paper detecting means,
At that time, since it can be determined that the photosensitive paper 12 has been sent to the transport path D, although indirectly, the photosensitive paper 12 is detected, the developing unit insertion prevention switching plate 37 is rotated to open the transport path, and The temperature of the heating element 46 is set to approximately the maximum heat value by the temperature control means 50, and then the temperature of the developing drum 4 is
The heating element 46 is controlled by the temperature control means 50 while monitoring the surface temperature of the developing drum 43, and the developing drum 43 is moved from the first temperature control range to a temperature higher than the heating temperature as shown in FIG.
Switch to a second temperature control range of 2-148 ° C.

When the photosensitive paper 12 has a long paper passing length, the surface temperature of the developing drum 43 gradually decreases as shown in FIG. 3F, but does not fall below 130.degree.
The heat development photosensitive paper can be kept within the proper development temperature range.
This is because the heating element 46 is set to substantially the maximum heat generation amount, and when the photosensitive paper 14 comes into contact with the developing drum 43, the heating element 46 has already heated the developing drum 43, and the heating delay of the developing drum 43 is eliminated. is there.

In the illustrated example, the developing unit insertion prevention switching plate 37 is provided.
When is returned to the position shown in FIG. 2, the temperature is returned from the second temperature control range to the first temperature control range so as to prepare for the next development of the photosensitive paper 12.

[0034]

As described above, according to the present invention, when the photosensitive paper is detected by the photosensitive paper detecting means, the developing drum is moved from the first temperature control range to the second temperature control range higher than the first temperature control range. Since the switching is performed, it is possible to eliminate a delay in heating of the developing drum and prevent shortage of development in the second half of the photosensitive paper even in the case of photosensitive paper having a long paper passing length.

According to the second aspect of the present invention, when the photosensitive paper comes into contact with the developing drum, the heating element is set to substantially the maximum heating value. Can be prevented.

According to the third and fourth aspects of the present invention, since the separately provided normal conveyance detecting means and reinsertion detecting means are also used as the photosensitive paper detecting means, the dedicated photosensitive paper detecting means is unnecessary and the structure is simplified. As a result, cost can be reduced by reducing the number of parts.

[Brief description of the drawings]

FIG. 1 is a diagram showing the arrangement of components of a giant copier according to the present invention.

FIG. 2 is a schematic configuration diagram of the inside thereof.

FIG. 3 is a graph showing the relationship between the lapse of time and the temperature of a developing drum, wherein the upper part shows the case of the present invention and the lower part shows the case of the prior art.

[Explanation of symbols]

 Reference Signs List A Table section B Exposure section C Separation section D Transport section E Heat development section 10 Document 12 Photosensitive paper 14 Overlaid paper 32 Document discharge detection sensor (photosensitive paper detection means) 37 Developing section insertion prevention switching plate 40 Photosensitive paper reinsertion port 41 Re Insertion detection means (photosensitive paper detection means) 43 Developing drum 46 Heating element 48 Temperature detection means 50 Temperature control means

Claims (5)

[Claims] 1. A developing drum for heating a photothermographic paper after exposure to develop a latent image formed on the photosensitive paper, a heating element for heating the developing drum, and a temperature for detecting a temperature of the developing drum. A heating / developing unit having a detecting unit, a photosensitive paper detecting unit provided in front of the heating / developing unit to detect photosensitive paper, and monitoring the temperature by the temperature detecting unit when the photosensitive paper is detected by the photosensitive paper detecting unit. A temperature control means for controlling the heating element while switching the developing drum from a first temperature control range to a second temperature control range higher than the first temperature control range. 2. A heating device according to claim 1, wherein when the photosensitive paper comes into contact with said developing drum, said heating element has a substantially maximum heating value.
2. A heat-developing diazo copying machine according to item 1. 3. The apparatus according to claim 1, further comprising a normal conveyance detecting means for detecting a document separated from the photosensitive paper after the exposure, and using the normal conveyance detecting means as the photosensitive paper detecting means.
Or a heat-developing diazo copying machine according to item 2. 4. A photosensitive paper re-insertion port for re-feeding the photosensitive paper discharged out of the machine after exposure, and a re-insertion detecting means provided at the photosensitive paper re-insertion port to allow re-feeding of the photosensitive paper. Detect
4. A heat developing type diazo copying machine according to claim 1, wherein said reinsertion detecting means is also used as said photosensitive paper detecting means. 5. When the photosensitive paper is detected by a photosensitive paper detecting means provided in front of the heating and developing section, the temperature control means monitors the temperature of the developing drum of the heating and developing section while monitoring the temperature of the developing drum. A developing temperature control method for a heat developing type diazo copying machine, comprising controlling a heating element and switching the developing drum from a first temperature control range to a second temperature control range higher than the first temperature control range.