JP2002072373A - Transporting device for photosensitive material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a transporting device which can obstruct the occurrence of fogging in photosensitive materials by removing the static electricity generated in transporting belts during the transportation of the photosensitive materials. SOLUTION: This transporting device is constituted by bearing metallic pivots 23 at a metallic frame 22, winding the transporting belts 21 consisting of conductive rubber around the metallic rollers 24 disposed at the pivots 23 and transporting photographic paper by inserting the paper between the transporting belts 21. The surface resistivity of the transporting belts 21 is set within a range from 1×108 to 1×1012 Ω.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving belt having a flexible material so that a photosensitive material in the form of a sheet is sandwiched between the driving belt and a conductive belt for removing static electricity generated in the conveying belt. TECHNICAL FIELD The present invention relates to a photosensitive material transporting device constituted by using an insoluble material.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. Hei 6-278893 discloses a photosensitive material transporting device having a conductive transporting belt as described above. The transport device is configured so as to sandwich and transport the sheet-shaped photographic photosensitive material, thereby preventing a phenomenon in which static electricity is generated in the photographic photosensitive material. Further, there is a similar technique which is not provided with a belt but is disclosed in Japanese Patent Application Laid-Open No. 2000-168191, and this conventional technique is provided with a nip roller for sandwiching and feeding a roll-shaped recording medium. The nip roller includes a metal core material coated with conductive rubber, a conductive system for grounding the charge of the core metal of the nip roller, and a static elimination plate for removing static electricity from the outer surface of the nip roller. .

[0003]

Considering the situation where the photosensitive material is transported by the transport belt, the transport belts come into pressure contact with each other at the start end of transport, and the respective transport belts are separated at the end side of transport. As described in the related art, static electricity is often generated by peeling, and such static electricity may be accompanied by a discharge phenomenon. When a discharge phenomenon occurs, the light-sensitive material is exposed to light due to the discharge, which leads to so-called fogging. Therefore, it is effective to form the transport belt using a conductive flexible material in order to remove static electricity, but how much conductive material should be used for the transport belt. It was not determined, and there was room for improvement.

SUMMARY OF THE INVENTION It is an object of the present invention to rationally construct a photosensitive material transport apparatus capable of effectively removing static electricity generated on a transport belt during transport of a photosensitive material and preventing fogging of the photosensitive material. is there.

[0005]

The features, functions and effects of the photosensitive material conveying apparatus according to claim 1 of the present invention are as follows. [Features] A transport belt made of a flexible material is drivably provided so as to sandwich and transport the sheet-shaped photosensitive material, and a conductive belt is used to remove static electricity generated on the transport belt. In the apparatus for conveying a photosensitive material, the surface resistivity of the material of the conveyor belt is set in a range of 1 × 10 ⁸ to 1 × 10 ¹² Ω.

According to the above features, when static electricity is generated on the conveyor belt by the surface resistivity set as described above, the static electricity is transmitted to the conveyor belt, and the potential deviation of the conveyor belt is reduced. At the same time, the potential difference between each part of the conveyor belt is reduced to suppress the occurrence of the discharge phenomenon. In other words, when considering the surface resistivity of the material of the conveyor belt, it is not only necessary that the surface resistivity is not simply low, but a material having an appropriate value is good. By doing so, a discharge phenomenon can be prevented. As a result, fog can be prevented from occurring when the photosensitive material is transported.

The features, operations and effects of the photosensitive material conveying apparatus according to claim 2 of the present invention are as follows. [Feature] The photosensitive material conveying apparatus according to claim 1, further comprising a static elimination member made of a conductive material that comes into contact with or approaches the conveyor belt.

According to the above-mentioned features, even if the conveyor belt is charged with static electricity, the charge can be released to the ground or the like by the static elimination member, and the phenomenon that the potential of the conveyor belt increases can be prevented. Become. as a result,
Thus, fogging during transportation can be more effectively prevented.

The features, functions and effects of the photosensitive material conveying apparatus according to claim 3 of the present invention are as follows. [Features] In the photosensitive material transport apparatus according to claim 1 or 2, the transport belt is constituted by covering the material with a belt-shaped fiber material.

According to the above-mentioned features, even if the material of the transport belt has a property of being stretched when a tension is applied, the elongation can be suppressed by the fiber material. Can be used without slackening the belt. As a result, the transport belt can be continuously used without causing slip between the pulley and the like wound around the transport belt.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an exposure unit EX for exposing image information to a photographic paper 1 as a photosensitive material sent from a photographic paper magazine M, and a developing process of the photographic paper 1 sent from the exposure unit EX are performed. A development processing unit DE to perform;
A photographic printer is provided with a drying section DR for drying the photographic paper 1 sent from the development processing section DE. The exposing unit EX has a plurality of rollers 2 for nipping and transporting the photographic paper 1 from the photographic paper magazine M, and a cutter 3 for cutting the transported photographic paper 1 into a print size.
And a pressure reducing mechanism 6 for reducing the negative pressure on the non-exposed surface side of the belt 5. An exposure transport device EC that adsorbs and transports the photographic paper 1 from the FC onto the surface of the belt 5, and a post-transport device RC configured to send the photographic paper 1 from the exposure transport device EC to the development processing unit DE. The exposure unit EX further transmits a light beam from a light source 7 to a photographic film supported by a film carrier 8 and transmits a light beam transmitted through the photographic film to an optical lens 9.
And a projection exposure system for projecting the image onto the photographic paper 1 at the exposure position.

The developing section DE has a developing tank 10 for performing a plurality of processes and a transport mechanism 11 composed of a number of rollers for continuously transporting the photographic paper to each developing tank 10. The drying section DR includes a plurality of rollers 12 for feeding the photographic paper 1 and a blower 13 for sending the drying air.

The above configuration is basically the same as a conventional photographic printer, and the present invention is characterized by a configuration for removing static electricity generated on the transport belt of the rear transport device RC.

That is, as shown in FIG. 1, the rear transporting device RC includes a first transporting device RC1, a second transporting device RC2, and a third transporting device RC3, which are arranged in this order in the transporting direction of the photographic paper 1. And the first, second, and third transfer devices RC
Since all of the transport devices 1, RC2, and RC3 are configured to be substantially equal, one of them will be described as an example in detail.
In other words, as shown in FIGS. 2, 3, and 4, this transport device is configured such that four transport belts 21 are set as one set and the photographic paper 1 is transported by sandwiching the printing paper 1 between the two sets of transport belts 21. A wide transfer path is formed, and the metal frame 22 is formed.
And a metal roller 24 around which a respective conveyor belt 21 is wound around a metal support shaft 23 supported at the end position of the tension shaft 2 supported at an intermediate position between these rollers.
5 is provided with a tension roller 26. The lower shafts 23 are linked by gears 27 so that they rotate in opposite directions, and the timing of the output shaft of a timing pulley 28 provided on one of the shafts 23 and an electric motor 29 provided on the frame 22. By providing the timing belt 31 over the pulley 30, the transport belt 21 can be driven and rotated by the driving force of the electric motor 29. The other end of the support shaft 23 having the timing pulley 23 is provided with a knob 32 that can be manually rotated during maintenance.

A charge removing brush 33 made of a conductive resin or a metal material is connected to the frame 22 via a metal conductor 34 as a charge removing member which comes into contact with the inner side of the winding of each set of the conveyor belts 21. , This frame 22 is grounded (grounded)
I have. As shown in FIG. 5, the conveyor belt 21 is formed of a first conductive rubber as a conductive material with respect to the inner surface and the outer surface of a seamless cloth 35 made of a polyester fiber material molded into a belt shape. 36 and the second conductive rubber 37 are formed in two layers. The surface resistivity of the second conductive rubber 37 is set in the range of 1 × 10 ⁸ to 1 × 10 ¹² Ω (ohm). The first conductive rubber 36
Is made of a material having a higher conductivity than that of the second conductive rubber 37 (the surface resistivity is about 2.5 × 10 ³ Ω).
By forming the conductive rubber in two layers so that the inner surface and the outer surface of the conveyor belt 21 have the same structure, even if the front and back of the conveyor belt 21 are erroneously attached, the performance is changed to the performance of removing static electricity. I have nothing.

In this embodiment, a first conductive rubber 36 and a second conductive rubber 37 are provided on the inner and outer surfaces of the conveyor belt 21.
Although two layers of rubber are formed, a layer of the first conductive rubber 36 may be exposed without forming a layer of the second conductive rubber 37 on the inner surface side. Alternatively, only the layer of the second conductive rubber 37 may be formed on each of the inner surface and the outer surface of the seamless cloth 35 made of a polyester fiber material molded into a belt shape.

[0017] In this transport device, 400 mm / sec.
The photographic paper 1 is conveyed at about the same speed. When the respective electric motors 29 are driven in this way, the gears 27, 27 cause the support shafts 23, 23 to move in opposite directions at a synchronized speed. When the transport belt 21 is driven in this manner, the surfaces of the transport belts 21 of the respective sets that come in contact with each other at the upper position in the transport direction come into contact with each other, and the lower side in the transport direction. At the end position, the conveyor belts 21 and 21 of each set are separated so that the surfaces thereof are peeled off. At the position where the separation is performed, the conveyor belts 21 and 21 are charged with static electricity by peeling charging. Since the surface resistivity of 37 is set to the value described above,
This conductivity reduces potential bias and at the same time,
The charge of this charge is released to the metal frame 22 via the metal roller 24, and the charge of the transfer belt 21 is further removed by the charge removing brush 33, so that the transfer belt 2 can be satisfactorily removed.
1 is removed to prevent discharge between the transport belts 21. In addition, since the transport belt 21 of this transport device is formed by coating the seamless cloth 35 with conductive rubber, the transport belt 21 is not affected by the properties of the conductive rubber and suppresses the slack of the transport belt 21. ing.

The wear resistance test of the second conductive rubber 37 is performed as shown in FIG. That is, the material M of the second conductive rubber 37 is formed into a ring shape having an inner diameter of 30 mm (millimeter) and an outer diameter of 80 mm as shown in FIG. A sample of the material M of the second conductive rubber 37 was formed into a 10 mm square, and was placed at the center position in the width W direction of the ring-shaped material M under a load of 1.15 kg (kg). The amount of wear when rotating at 48 revolutions per minute (48 rpm) for 8 hours is relatively small at about 0.06 mm. As shown in FIG. 7, the value of the wear amount is lower than the wear amount of 0.19 mm in the same wear resistance test performed on the material M of the first conductive rubber 36.

The present invention can be applied to a post-transport device in a photographic printer shown in FIG. 8 as an example different from the above-described embodiment. In the different embodiments, those having the same functions as those of the embodiments are denoted by the same reference numerals and symbols. In this different embodiment, the rear transfer device RC is provided with five transfer devices.

[Other Embodiments] The present invention can be applied to, for example, a conveying device for conveying photographic paper at a position higher than an exposure position, in addition to the above-described embodiment.
The present invention can be applied to a transport device for transporting a photographic film as a photosensitive material.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a photographic printer.

FIG. 2 is a front view of a transfer device.

FIG. 3 is a longitudinal sectional side view of a transfer device.

FIG. 4 is a side view showing a driving structure of the transfer device.

FIG. 5 is a cross-sectional view of a transport belt.

FIG. 6 is a perspective view showing a test form of a wear resistance test.

FIG. 7 is a graph showing test results of a wear resistance test.

FIG. 8 is a side view showing a different embodiment of the photographic printer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Photosensitive material 21 Conveyor belt 33 Brush 35 Textile material 36 Material

 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 2H098 AA03 CA20 CA40 EA09 2H106 AB04 AB45 AB64 BA11 BA91 3F049 AA06 BA13 LA01 LB03 3F101 AA03 LA01 LB03

Claims (3)

[Claims] 1. A transport belt made of a flexible material is provided so as to be drivable so as to sandwich and transport a sheet-like photosensitive material, and a conductive material is used for the transport belt so as to remove static electricity generated on the transport belt. A device for transporting a photosensitive material, wherein the material of the transport belt has a surface resistivity of 1 × 10 ⁸ to 1 ×.
Conveyor for photosensitive material set in the range of 10 ¹² Ω. 2. The photosensitive material conveying device according to claim 1, further comprising a static elimination member made of a conductive material that comes into contact with or approaches the conveying belt. 3. The photosensitive material transport device according to claim 1, wherein the transport belt is constituted by covering the material with a belt-shaped fiber material.