JP2710489B2 - Safety device for heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a safety device for a heater which operates in accordance with the heat generation state of the heater for heating each processing solution in the photosensitive material processing apparatus.

[0002]

2. Description of the Related Art Generally, in a photosensitive material processing apparatus,
Processing is carried out with processing solutions such as development and fixing, so that the photosensitive material is finished in an optimal state. The temperature of the developing solution and the fixing solution is raised to a certain temperature so that the photosensitive material is processed and finished in an optimum state.

In order to keep each processing solution at a constant temperature, each processing tank of the photosensitive material processing apparatus is provided with a heater for heating the processing solution. Each processing solution is heated to a certain temperature by a heater when the photosensitive material processing apparatus is started up,
After startup, a constant temperature is maintained. The heater provided in each processing tank does not affect the functional components in each processing tank or the transport of the photosensitive material, and each processing tank is easy to keep the processing liquid at a substantially uniform temperature. Often located at the bottom of the.

[0004] Each of the processing tanks is provided with a plurality of safety devices for controlling the operation of the heater and preventing overheating by the heater. As a safety device for the heater, for example, the operation of the heater is controlled so that the temperature of the processing liquid is constant by detecting the heating temperature by the heater, and when the processing liquid reaches a constant temperature, the heater is controlled. There is a temperature thermometer for cutting off the supply of power, or a shutoff device for shutting off the power of the heater when the heater is abnormally overheated due to, for example, empty heating. Each processing tank is provided with a plurality of these heater safety devices.

It is preferable that such a safety device for a heater be provided close to each heater, since the heating state of the heater can be accurately detected and its function can be sufficiently exhibited. However, if a plurality of safety devices are integrally mounted on the heater, it is not preferable because the size of the heater is increased and the cost is increased. For this reason, the heater safety device is generally provided with a device incorporated in the heater and a device disposed near the heater in parallel. For this reason, a through hole for mounting a heater safety device is formed at the bottom of each processing tank, and a heater safety device is mounted in this through hole, and wiring from the through hole to the heater safety device is drawn in. Have been.

[0006]

However, if the confidentiality of the through holes provided in each processing tank is impaired and liquid leakage or the like occurs, the leaked processing liquid adheres to the wiring connection portion of the heater safety device. Otherwise, the operation of the heater safety device may be impaired, and the function of the heater safety device may be impaired.

[0007] The present invention has been made in view of the aforementioned, an object is to provide a safety equipment heater that can sufficiently exhibit the function as leakage concern without safety device of the treatment liquid It is.

[0008]

Means for Solving the Problems According to claim 1 of the present invention.
The safety device for the heater is used for processing the processing tank of the photosensitive material processing device.
Depending on the heat generation condition of the heater of the heater immersed in the liquid,
An operating heater safety device , comprising:
The processing liquid in the processing tank propagates above the maximum liquid level.
Reach the heat transfer member and the maximum level of the processing liquid.
And is transmitted above by the heat transfer member.
A detecting unit for detecting a temperature of the heat generating unit;
Between the power supply for supplying power to the
Limit the heat generation of the heat generating part according to the temperature detected by the
Operating means operable to operate as described above.

[0009] heater safety device according to claim 2 of the present invention, a heater which operates in accordance with the heat generation state of the heat generating portion of <br/> heater that will be immersed in the processing solution in the processing tank of the photosensitive material processing apparatus A safety device, which is immersed in a processing liquid corresponding to the heat generating portion.
And <br/> detection portion that deforms in response to the placed temperature change of the heat generating portion as the processing deformation with temperature change of the detection unit
Transfer above the maximum level of the processing liquid in the bath
A transmission member, the heating section, and power supply to the heating section
Between the power source and the transmission member.
Operating means for operating to limit the heat generation of the heat generating portion in accordance with a temperature change of the heat generating portion.

[0010]

In the heater safety device according to the first aspect of the present invention, the temperature of the heat generating portion of the heater in the processing liquid is controlled by the heat transfer member.
Detection is provided above the maximum liquid level of the processing liquid
To the department. The operating means controls the operation of the heat generating portion of the heater according to the temperature detected by the detecting portion.

[0011]

[0012] heater safety device according to claim 2 of the present invention, arranged upward from the maximum liquid level of the processing liquid of the actuating means, the temperature change of the heat generating portion of the heater in the processing liquid of the detection unit
Deformation corresponding to the maximum level of the liquid level by the transmission member
It transmits to the actuating means arranged above .

[0013] Thus, in the present invention, since being set only the actuating means to above the liquid surface of the treatment liquid, the wiring connected to the actuation means without being immersed in the treatment liquid, the operation of the actuating means Can be reliably transmitted to the heater.

The operating means and the detecting section can be provided integrally above the level of the processing liquid. In this case, the heat transfer member may be formed in the shape of a solid round bar of a good heat conductor to reduce the surface area to suppress unnecessary release of heat. Also, the detection unit is a heater
Can be arranged in the processing liquid together with the heat generating portion. In this case, since the detection unit can be adjacent to the heating unit,
The responsiveness of the operating means can be improved.

It operates according to a temperature change detected by the detecting unit .
The operating means may be turned on or off when the temperature reaches a certain level or higher, and may be any means that cuts off the supply of power to the heater. Further, the detecting unit and the operating unit may be configured to automatically return when the heating unit detects that the temperature of the heat generating unit has become equal to or lower than a predetermined temperature after the operation, or may be configured to return manually. A manual return type or automatic return type bimetal, a temperature thermostat, a temperature fuse and the like can be applied. The safety device for a heater according to the present invention is a protection means for preventing a heater that raises the temperature of a processing solution to maintain a predetermined temperature from malfunctioning and causing an abnormal rise in temperature to adversely affect resin parts and the like near the heater. It is of course possible to use it in combination with other protection means.

This heater safety device can also be applied to a heater arranged in the processing tank. Since both the power supply connection portion of the heater and the heater wiring connection portion are disposed above the liquid level of the processing liquid, adhesion of the processing liquid is prevented. This eliminates the need for a through-hole for mounting the heater and the heater safety device in the processing tank, so that there is no risk of liquid leakage from the processing tank.

[0017]

【Example】

Embodiment 1 FIG. 1 is a schematic structural view of an automatic developing machine 10 which is a photosensitive material processing apparatus to which the present invention is applied.

The automatic developing machine 10 has a casing 12
An insertion port 16 for inserting the photosensitive material 14 is provided on the left side surface (upstream end portion) of FIG. A pair of rollers 18 are provided inside the insertion port 16 and are rotated by driving means (not shown). For this reason, the photosensitive material 14 inserted from the insertion opening 16 is
Processing unit 20 installed inside automatic developing machine 10
You will be guided to

The processing section 20 is provided with a plurality of processing tanks,
The developing tank 24 and the rinsing tank 2 are respectively shown from the left side of FIG.
6, a fixing tank 28, a rinsing tank 30, and a washing tank 32. The developing tank 24, the fixing tank 28, and the washing tank 32 (hereinafter collectively referred to as "processing tank") store a developing solution, a fixing solution, and washing water, respectively. Also, the rinsing tank 26
Rinse water (eg, water or acetic acid aqueous solution) rinse tank 30
, Washing water (for example, water) is supplied from each storage tank (not shown) via a pipe via a pump, and the supplied washing water overflows from the rinsing tanks 26 and 30 to the overflow tank.

When the washing water is water, pipes are provided directly from the water supply to the rinsing tanks 26 and 30 via a solenoid valve without using a storage tank, and water is supplied to each of the rinsing tanks 26 and 30. You may make it.

In the processing tanks 24, 28 and 32, racks 34 are arranged, respectively, and a plurality of pairs of rollers 36 for holding the photosensitive material 14 and transporting the photosensitive material 14 along a predetermined transport path are provided.

A crossover rack 46 having a rinse rack is disposed above each processing tank. The crossover rack 46 includes the rinsing tanks 26, 3
0, rollers 38 and 40 are provided above the photosensitive material 14.
And guides it to an adjacent processing tank, and removes the processing liquid attached to the photosensitive material 14.

As shown in FIG. 2, a liquid temperature adjusting tank 62 is disposed adjacent to each of the developing tank 24 and the fixing tank 28. FIG. 2 shows a cross section of a main part of the developing tank 24 (fixing tank 28) cut along the width direction of the conveying path of the photosensitive material 14.

The liquid temperature adjusting tank 62 is provided at one end in the width direction of the developing tank 24 and the fixing tank 28 (in this embodiment, the near side in FIG. 1). At the other end in the width direction, a drive source for driving the rollers 36 of the rack 34 and the like is provided.

The liquid temperature adjusting tank 62 is partitioned by providing a flame-retardant or non-combustible heat shield plate 100 between a side plate 64 of each processing tank and a rack 34 accommodated in each processing tank. .
In the heat shield plate 100, communication holes 102 and 104 are formed near the liquid surface of the processing liquid and near the bottom in each processing tank. The processing liquid in each processing tank freely flows from these communication holes 102 and 104 into the liquid temperature adjusting tank 62, and the level of the processing liquid in each processing tank and the liquid temperature adjusting tank 62 is always the same. .

One end of a pipe 106 is connected to the bottom of the liquid temperature adjusting tank 62. A pump 108 is provided at an intermediate portion of the pipe 106, and the other end of the pipe 106 is connected to the bottom of the adjacent developing tank 24 or fixing tank 28, and each processing tank and the liquid temperature adjusting tank 62 are connected via the pipe 106. They are still in communication. By the operation of the pump 108, the processing liquid in the liquid temperature adjusting tank 62 is supplied to the bottom of each adjacent processing tank. As a result, the liquid temperature adjusting tank 6 adjacent to the processing liquid in each processing tank.
The processing liquid in 2 is circulated and mixed.

A lid 112 is mounted above the liquid temperature adjusting tank 62, and the heater 60 is inserted through the lid 112 into the liquid temperature adjusting tank 62. The heater 60 has a heat generating portion 110 in which a heat generating body (not shown) as a heat source is housed inside from a middle portion in the axial direction to a lower end of a cylindrical body made of a stainless alloy (for example, SUS316). Further, a temperature sensor (not shown) is housed inside from the middle part to the upper end of the heater 60, and detects the heat generation temperature of the heat generation part 110. The heating section 11
A ceramic heater (for example, a product of Hirano Corporation, rated 288 W / 240 V) using ceramics as the heating element of 0 can be applied.

The liquid temperature adjusting tank 62 has a side plate 64 and a heat shield plate 1.
00 and a cover 112 is provided.
The heater 60 has a through-hole 114 provided in the lid 112 at the top.
The heat generating unit 110 is immersed in each processing liquid. A wiring 138 connected to a heating element (not shown) and a temperature sensor in the heater 60 is connected to the heater 6.
0 is pulled out from the power connection at the upper end.

In the vicinity of the through hole 114 of the lid 112, the lid 1
A safety device housing 116 is formed on both sides of the lid 112 so as to penetrate the safety device housing 116. The safety device storage unit 116 includes a manual reset type bimetal thermostat (manufactured by Japan GT Co., Ltd .; hereinafter, referred to as a "thermostat 120") having a detection unit 122 and a shut-off unit 124 as a detection unit and an operation unit of the heater safety device 118. ) Are arranged.
Thermostat 120, the detection unit 122 is adapted to release the contact provided to the cut-off portion 124 to be heated above a certain temperature (not shown). The open contacts are
The blocking portion 124 upward (toward upward in FIG. 2) or we push Succoth, return button (not shown) of the internal blocking portion 124 is closed by being pushed. When returning, the temperature of the detection unit 122 needs to be lower than a certain temperature.

The thermostat 120, the detection unit 122 is directed to the treatment liquid-liquid surface, blocking portion 124 is directed upward, the wiring is connected to the contacts of the interrupting unit 124 140
Is pulled out from above the safety device storage unit 116. The wiring 140 is connected to the wiring 138 of the heater 60, and the heat generating unit 1
The power supply to 10 is cut off.

A transmission member 126 is provided between the heating section 110 of the heater 60 and the detection section 122 of the thermostat 120. The transmission member 126 is a solid round bar, an intermediate portion of which is bent in the axial direction, and both end portions are directed in parallel and in opposite directions. One end of the transmission member 126 in the longitudinal direction is arranged along the heat generating portion 110,
The support member 128 is closely fixed to the heat generating portion 110. Also, at the other end in the longitudinal direction of the transmission member 126,
A flange 130 is formed. The flange 130
The detection device 122 is in close contact with the lower end of the safety device storage unit 116, thereby closing the safety device storage unit 116 and the flange 130.

When the heat generating portion 110 generates heat, the heat is transmitted to the transmitting member 126 and the flange 13 of the transmitting member 126
From 0, heat is transmitted to the detection unit 122.

The heater 60 and the safety device storage 116
Is covered with waterproof caps 132 and 134 having a wiring outlet 136. Also. A drip-proof cover 142 made of, for example, stainless steel is provided above the lid 112 so as to cover the lid 112 from each processing tank. As a result, drip-proofing is performed at a portion where the wiring is drawn from the heater 60 and the thermostat 120.

Each of the developing tank 24 and the fixing tank 28 is provided with a float switch or the like for detecting the liquid level of each processing liquid. Prevention of empty burning due to

The processing liquids (developing liquid and fixing liquid) are heated and circulated by the respective heaters 60 to reach a temperature at which the photosensitive material can be processed when the automatic developing machine 10 is started up. Is maintained at a temperature at which it can be processed.

On the other hand, as shown in FIG.
The photosensitive material 14, which has been subjected to the water washing process,
By 2, it is conveyed to the drying unit 45 adjacent to the processing unit 20. In the drying section 45, the photosensitive material 14 which has been washed with the washing water is dried.

The photosensitive material 14 is inserted into the drying chamber 45A of the drying section 45 from the drying chamber insertion port 44. Drying room 45
A is provided with a squeeze roller 48, two heat rollers 50, and a discharge roller 52 along the conveyance path of the inserted photosensitive material 14. The squeeze roller 48 squeezes moisture adhering to the surface while nipping and transporting the photosensitive material 14, and further guides the photosensitive material 14 to the outer peripheral edge of the heat roller 50 by a guide 54 provided downstream of these squeeze rollers 48. Is done.

The two heat rollers 50 are arranged substantially vertically and are adapted to wind and transport the photosensitive material 14 on the outer peripheral surface. The heat roller 50 has a cylindrical shape, and an infrared heater 56 for heating the heat roller 50 and an outer peripheral portion is coaxially disposed at an axial center portion. A plurality of nip rollers 58 are provided on the outer peripheral edge of the heat roller 50 so that the photosensitive material 14 wound around the heat roller 50 is sandwiched between the nip roller 58 and the outer peripheral surface of the heat roller 50. I have. The photosensitive material 14 includes an infrared heater 56
The heat roller 50 is heated and dried by contact with the outer peripheral portion of the heat roller 50 heated by the heat.

At the downstream side of each heat roller 50 in the conveying direction of the photosensitive material 14, one end is in contact with the outer peripheral surface of the heat roller 50, and the other end is rotatably supported by a side plate 64 in the drying chamber 45A. A guide 66 is provided. The photosensitive material 14 wound around the heat roller 50 is guided by a peeling guide 66 from an outer peripheral surface of the heat roller 50 at a predetermined position.

The heat roller 5 of the nip roller 58
On the side opposite to 0, a spray pipe 6 with a hollow inside
8 are provided. These spray pipes 68 are formed with slits (not shown) communicating with the inside toward the conveyance path of the photosensitive material 14 along the width direction of the photosensitive material 14. The spray pipe 68 directs the drying air supplied to the inside of the photosensitive material 14 and uniformly discharges it along the width direction of the photosensitive material 14.

Guides 72 are arranged between the downstream side of each heat roller 50 and the discharge roller 52, respectively. The guide 72 guides the photosensitive material 14 conveyed by the heat roller 50 or the discharge roller 52 to the heat roller 50 or the discharge roller 52 on the downstream side. Each guide 72 has a hollow inside, and a slit (not shown) is formed along the width direction of the photosensitive material 14 to be guided. The guide 72 is supplied with the drying air thereinto so as to be directed toward the photosensitive material 14 and to uniformly discharge the drying air along the width direction of the photosensitive material 14.

The drying air discharged from each of the spray pipe 68 and the guide 72 promotes the drying of the photosensitive material 14, and discharges the high humidity air that has stayed near the surface of the photosensitive material. I have.

Below the drying chamber 45A, a fan 82 and a heater 84 for generating drying air are provided. The drying air is supplied to the inside of the spray pipe 68 and the guide 72 through a duct (not shown). In addition, without providing the heater 84, the air outside the automatic developing machine 10 is supplied into the drying chamber 45A by the fan 82 or the air in most of the drying chamber 45A is circulated by the fan 82, Drying room 45 with some air
You may make it supply in A.

The photosensitive material 14 dried in the drying chamber 45A is discharged out of the automatic developing machine 10 through a discharge port 78.

A heat roller 50 is provided in the drying chamber 45A.
A plurality of temperature sensors 76 are arranged in the vicinity of the outer peripheral edge of. The heat roller 5 is controlled by these temperature sensors 76.
The drying temperature of the photosensitive material 14 is detected by measuring the surface temperature of the outer peripheral portion of the photosensitive material 14.

The infrared heater 56, the temperature sensor 76, the fan 82, and the heater 84 are connected to the control device 80 so that the drying temperature of the photosensitive material 14 in the drying section 45 is controlled. The controller 80 is connected to a temperature / humidity sensor or humidity sensor (not shown) for detecting the temperature / humidity or humidity outside the automatic developing machine 10. It is designed to detect humidity. In order to make the moisture content of the finished photosensitive material 14 the moisture content at the time of exposure, the control device 80 controls the photosensitive material 14 according to the temperature or humidity under the working environment.
Is previously obtained and stored based on experimental results and the like.

Thus, the drying of the photosensitive material 14 to be dried in the drying section 45 is performed in accordance with the temperature and humidity of the working environment, at least in accordance with the humidity. Of water.

Next, the operation of this embodiment will be described. When the photosensitive material 14 is inserted into the automatic developing machine 10 from the insertion opening 16, the photosensitive material 14 is drawn in by the transport rollers 18, guided by the guide surface of the crossover rack 46, and transported into the developing tank 24. In the developing tank 24, the photosensitive material 14 is sandwiched between rollers 36 provided on a rack 34, conveyed in a substantially U-shape in the developing solution, developed by the developing solution, and discharged downstream.

The photosensitive material 14 discharged from the developing tank 24
After being washed by the washing water of the rinsing tank 26 while being conveyed to the rollers 38 of the rinsing tank 26, it is guided to the guide surface of the crossover rack 46 and sent to the fixing tank 28. In the fixing tank 28, the photosensitive material 14 is sandwiched by rollers 36 provided on a rack 34, is conveyed in a substantially U-shape through the fixing solution, is subjected to fixing processing by the fixing solution, and is discharged to the downstream side.

The photosensitive material 14 discharged from the fixing tank 28 is washed by the washing water while being conveyed to the rollers 40 of the rinsing tank 30, reaches the washing tank 34, is conveyed through the washing water by the rack 34, and is subjected to the washing process. You.

The photosensitive material 14 which has been subjected to the water-washing process in the water-washing tank 32 is inserted into the drying chamber 45A of the drying unit 45, and is conveyed through the drying chamber 45A to be dried.

The photosensitive material 14 inserted into the drying chamber 45A
Is squeezed by the squeeze roller 48 and wound around the heat roller 50 on the upstream side, and the heat of the outer peripheral portion of the heat roller 50 is transferred by heat conduction and heated. Dry air is discharged from the spray pipe 68, and is also heated and dried by these. Further, the heat roller 50 is similarly heated and dried by heat conduction by the heat roller 50 on the downstream side, and is heated by the drying air.
And is discharged from the discharge port 78 to the outside of the automatic developing machine 10.

The developing tank 24 and the fixing tank 28 of the automatic developing machine 10
The developing solution and the fixing solution stored in the automatic developing machine 1 are respectively heated by heaters 60 provided in respective solution temperature adjusting tanks 62.
At the start of operation 0, the photosensitive material 14 is heated to a predetermined temperature at which the photosensitive material 14 can be processed and is started. The automatic developing machine 10
During the operation, the temperature sensor (not shown) in the heater 60 detects the heat generation temperature of the heater 60 and turns on / off the power supply to the heat generation unit 110 so that each processing liquid can process the photosensitive material 14. Maintain in the temperature range.

When the heat generating portion 110 of the heater 60 generates heat, the processing liquid around the heat generating portion 110 is heated. The heated processing liquid is returned to each processing tank by a pipe 106 and a pump 108, and the heat shielding plate 10
The processing liquid flows into the liquid temperature adjusting tank 62 from the communication holes 102 and 104 of 0. As a result, the processing liquids are sequentially heated and circulated, and the temperatures of the processing liquids in the processing tanks become substantially uniform.

The heater 60 is inserted into the liquid temperature adjusting tank 62, and a heat shield plate 100 is provided between the heater 60 and functional components in each processing tank such as the rack 34. Therefore, the radiation heat of the heater 60 does not directly heat the rack 34 or the like, and damage such as thermal deformation of the rack 34 or the like is prevented.
That is, the functional components in each processing tank are protected by providing the liquid temperature adjusting tank 62 divided into each processing tank by the heat shield plate 100. For this reason, the heater 60 can be arranged in a narrow space in each processing tank.

The temperature near the heating section 110 of the heater 60 is transmitted to the detection section 122 of the thermostat 120 via the transmission member 126. When the heater 60 is overheated for some reason, the abnormality of the heating is detected by the transmission member 126.
And the detection unit 122 opens the contact point of the interruption unit 124 when the detection unit 122 reaches a certain temperature or higher. Since the supply of power to the heating unit 110 of the heater 60 is shut off by opening the contact of the shut-off unit 124 of the thermostat 120, the heat generation of the heater 60 is stopped.

Normally, the operating temperature of the detecting unit 122 is set higher than the temperature at which each processing liquid is heated by the heater 60, and is operated only when the heater 60 is overheated for some reason. In addition, the blocking unit 124
When the thermostat 120 is restored, the operator may determine the cause of overheating of the heater 60 and then return the thermostat 120. And the heater 60 does not overheat again.

Since the transmitting member 126 is a solid round bar, the heat received from the heater 60 can be reliably transmitted to the flange 130. Normally, the temperature of the portion of the transmission member 126 immersed in the processing liquid is substantially equal to the temperature of the processing liquid by the heater 60. Further, when the transmitting member 126 has relatively small radiant heat in air and has a short length, it is not extremely cooled. Therefore, the transmission member 126, the detecting section 122 provided above the processing solution, it is possible to transmit the heat generation state of the heater 60.

Incidentally, the transmission member 126 may be extended to the heater 60. Thus, the flange 130, not only the transmission member 126, for receiving the even directly heat from the heater 60, it is possible to operate the detecting section 122 more accurately.

Furthermore, the heater 60 and the heater safety device 1
The operation of the heater safety device 118 can be checked with the device 18 and the lid 112 assembled, and after the operation of the heater safety device 118 has been checked, it can be assembled to each processing tank. Thereby, the reliability of the heater safety device 118 attached to each processing tank of the automatic developing machine 10 is improved, and the maintenance is facilitated.

Note that the heater safety device 118 does not have to directly shut off the power supply to the heater 60 by the thermostat 120. For example, instead of the thermostat 120, a thermostat or the like may be provided and automatically turned on / off according to the heat generation state of the heater 60.
Further, a plurality of heater safety devices may be provided.

(Embodiment 2) FIG. 3 shows Embodiment 2 of the present invention.
Is shown. In the second embodiment, the configuration is basically the same as that of the first embodiment, and the same parts as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

The lid 150 of the liquid temperature adjusting tank 62 has a heater 6
A safety device accommodating portion 152 protruding in a cylindrical shape is formed near zero. A cover 150 is provided in the safety device housing 152.
Is formed, and a through hole 154 is provided with a cylindrical detection portion 156. Detector 156
Is provided with a blocking portion 124 at the upper end thereof, and a heat transfer member 158 is fixed at the lower end thereof. The heat transfer member 158 is connected to the heat generating portion 110 of the heater 60 by the fixing member 160,
The heater 60 is supported and fixed. This fixing member 160
Thereby transmitting the heat transfer member 158 to heat the heating portion 110.

The bottom of the detecting section 156 has a bimetal 16
2 is provided, heat the bimetal 162 and the blocking portion 124
They are connected by a shaft 164 provided as a reaching member . The bimetal 162 is curved in an arc shape, and its intermediate convex portion is in contact with the heat transfer member 158. One end of the shaft 164 is in contact with the intermediate concave portion of the bimetal 162 on the side opposite to the heat transfer member 158, and the other end of the shaft 164 is in contact with the blocking portion 124.

[0065] When the bimetal 162 by the heat of the heat transfer member 158 which has been heated constant temperature over the heating unit 110, presses the shaft 164 warp upward changes curved direction upward. This shaft 164
Further presses the breaking part 124 to open the internal contact of the breaking part 124.

The heater safety device 148 includes the detecting unit 1
Reference numeral 56 is provided inside the processing liquid, and the shaft 164 moved by the bimetal 162 activates the blocking part 124. Also in this case, the heater safety device 1
The wiring to 48 is connected above the processing liquid level,
There is no fear that the wiring to the heater safety device 148 and the connection portion of the wiring are immersed in the processing liquid.

[0067] The heater 60 by the bimetal 162 to detect the overheating of the heat generating portion 110, because it is provided in contact with the heat transfer member 158 in the processing liquid, the processing liquid which has been heated by the fixing member 160 and the heater 60 Is reliably transmitted, and the safety device 148 for the heater operates reliably.

In this embodiment, the heater 60 is provided in the developing tank 24 and the fixing tank 28 of the automatic developing machine 10, but the washing tank 3
The heater 60 may be provided to other processing tanks such as 2 with the same structure.

[0069]

As described above, a heater according to the present invention is provided.
Safety device is an operating means that supplies power to the heating part of the heater.
Since the step is located above the maximum level of the processing liquid, the processing liquid adheres to the wiring for supplying power to the heater
Do not drip or soak .

[0070]

Further, according to the present invention , the heater and the safety device for the heater can be attached to each of the processing tanks in a state where they are assembled in advance. Thus, since the operation of the heater safety device can be confirmed in a state where the heater and the heater safety device are assembled, an excellent effect of improving the reliability of the heater safety device can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic structural view of an automatic developing machine according to the present embodiment.

FIG. 2 is a cross-sectional view of a main part of a processing tank, showing attachment of a heater according to the first embodiment.

FIG. 3 is a cross-sectional view of a main part of a processing tank similar to FIG. 2, illustrating attachment of a heater according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Automatic developing machine (photosensitive material processing apparatus) 14 Photosensitive material 24 Developing tank (processing tank) 28 Fixing tank (processing tank) 34 Rack 60 Heater 62 Liquid temperature adjusting tank (processing tank) 100 Heat shield plate 102, 104 Communication hole 106 Piping 108 Pump 110 Heating section 118, 148 Heater safety device 122 Detecting section 124 Blocking section (operating means) 126 Transmission member (Heat transmission member) 156 Detection section 164 Shaft (Transmission member)

Claims (2)

(57) [Claims] In a processing solution in a processing tank of a photosensitive material processing apparatus ,
Operates according to the heating state of the heating part of the immersed heater
A safety device for a heater , comprising:
Transfer the processing liquid above the maximum level of the processing liquid in the bath
Heat transfer member, above the maximum level of the processing liquid
The heat transfer member and the heat transfer member
A detecting section for detecting the temperature of the heating section;
Between the power supply for supplying power to the
Limit the heat generated by the heat generating part according to the temperature detected by the part
Heating, characterized in that it comprises a and actuating means for actuating the
Safety device . 2. A photosensitive material processing processing tank of the processing safety device for a heater which operates in accordance with the heat generation state of the heating portion of the heater that will be immersed in the solution of equipment, the processing corresponding to the heating unit
It is arranged so that it can be immersed in liquid and responds to changes in the temperature of the heating part.
And a deformation corresponding to a temperature change of the detection unit.
Shape above the maximum level of the processing liquid in the processing tank
A transmitting member for transmitting the electric power to the heat generating portion and the electric power to the heat generating portion.
Between the power supply for supplying
Operating means for operating to limit heat generation of the heat generating portion in accordance with a temperature change of the heat generating portion.