JPH04365042A - Undeveloped film - Google Patents

Abstract

PURPOSE:To provide an undeveloped film capable of being smoothly conveyed when the photographic film is developed. CONSTITUTION:Tip sections of a film 1 extracted from a patrone 2 are cut into an obtuse-angled shape with the angle theta or a circular arc shape with the curvature (r) at positions not crossing perforations 11.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an undeveloped film,
In particular, the present invention relates to a film processing technique suitable for use in automatically developing photographic film.

0002

2. Description of the Related Art A conventional photographic film (hereinafter simply referred to as film) 1 is spirally wound inside a cylindrical cartridge 2 as shown in FIG. It is constructed so that it can be drawn out in a band shape approximately tangentially from the circumferential surface. Since the film 1 is wound around the core in the cartridge 2, when it is pulled out, it has a curled shape as shown in the figure.

On the other hand, in a developing device for developing the film 1, the film 1 is conveyed while being sequentially immersed in a developing tank, a fixing tank, etc. During this dipping and transportation, conventionally, an uncurled leader tape is attached to the tip of the film 1.
Film 1 was led by leader tape.

However, there are various problems with this method, such as the need for a leader tape and the fact that it is time-consuming to apply it, so recently automatic developing devices that can develop the film without using a leader tape have been developed. has come to be used. In this case, the film 1 is guided along a slit-shaped conveyance path formed by a guide member. The tip of the film 1 for general photography has a stepped shape with a tongue-like part.
Since the tongue-shaped portion is bent when loaded into the camera, the film 1 cannot be conveyed as it is by being guided to the slit-shaped conveyance path. Therefore, film 1
The film 1 is processed by being cut at a predetermined position at right angles to both sides of the film 1, as shown by dotted lines X in FIG.

[0005]

[Problems to be Solved by the Invention] However, since the film 1 is curled due to curling during winding, the right-angled tip corner may get caught on a guide member, etc., and the reliability of conveyance is reduced. low. For this reason, there was concern about conveyance of the film 1, and high-speed conveyance could not be carried out. Therefore, there is a limit to the efficiency of development processing.

[0006] In order to solve the above problem, a method has been proposed in which the vicinity of the cutting position Pushing work is required, and workability is not good.

The present invention has been made in view of the above-mentioned circumstances, and its object is to provide an undeveloped film that can be smoothly transported during developing processing of photographic film.

[0008]

[Means for Solving the Problems] The object of the present invention is to provide an undeveloped film whose leading end is drawn out from a cartridge so that the end of the side edge in the drawing direction becomes an obtuse edge or an outwardly protruding arcuate edge. This is achieved by using an undeveloped film that is cut to avoid perforations.

[0009]

[Function] According to the undeveloped film, when the film is transported, both ends of the leading edge do not get caught in the transport path.
Since the conveyance resistance is reduced, smooth conveyance can be performed.

0010

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 8. 1 to 3 show embodiments of an undeveloped film to which the present invention is applied, and FIG. 8 shows an example of an automatic developing device for developing an undeveloped film. In explaining the embodiments, each embodiment of the undeveloped film will be explained, and then the automatic developing device will be explained.

A first example of an undeveloped film will be explained with reference to FIGS. 1 and 2. The leading end of the film 1 pulled out from the cartridge 2 is cut, for example, at a position indicated by a dotted line X by a cutter to be described later. However, rather than simply cutting at an appropriate position, there are various ways to change the cutting position and the shape of the cut surface.

First, the cutting position of the film 1 will be explained. That is, perforations 11 are formed at predetermined intervals on both sides of the film 1 for engaging sprockets when the film 1 is fed within the camera. The cutting position is set using the gap between the perforations 11 so as not to overlap each perforation 11.

On the other hand, as shown in a partially enlarged view of FIG. 2, the cutting shape is not cut perpendicular to both side edges 1b of the film 1, but the angle θ of the cut edge is set to 90° or more. and cut. Further, in the case of a 35 mm film, the cutting depth d is set to about 1 mm to 3 mm, and is about 5 mm at the maximum.

Next, another example of the cutting shape will be explained with reference to FIG. 3. The cutting position is set in the same manner as described above, but the cutting edge is formed in an arc shape. The radius of curvature r of the cut edge is set to about 1 mm to 3 mm, and at most about 5 mm.

By cutting the leading end of the film 1 as described above, the transport resistance during transport for development processing can be significantly improved as shown in the table below.

[0016]

[0017] The film transport resistance shown in the above table is as follows:
It is determined by the resistance torque of the transport roller 22 when the film 1 is inserted through a slit-shaped film guide 21 as shown in FIGS. 4 and 5 and the transport roller 22 is rotated to transport the film 1. . As is clear from the above table, the undeveloped film 1 shown in this embodiment has less film transport resistance than that of a film whose leading end is cut at a right angle. Therefore, the conveyance speed of the film 1 can be increased during the development process, and the efficiency of the development process can be improved.

Incidentally, if the cutting position of the undeveloped film 1 is not set as described above, but is cut randomly at a position that overlaps the film feed hole 11, protrusions are formed at both ends of the cut surface as shown in FIG. This may cause the film to get caught on the inner wall surface of the film guide 21 during transport, or increase frictional resistance. In addition, when cutting at right angles, the corners are deformed and frictional resistance tends to increase as shown in FIG. However, in the undeveloped film 1 shown in this embodiment, the above-mentioned disadvantages can be solved at once.

Next, the development process and the like of the film 1 will be explained with reference to FIG. Inside the case 101, from left to right, there are a developer tank 105, a bleach tank 106, and a fixer tank 1.
07, three washing tanks 108 and a drying section 109 are installed in this order. Note that each tank from the developer tank 105 to the washing tank 108 is provided with a conveyance roller as shown in a part of the developer tank 105, but the illustration thereof is omitted. Furthermore, an autoloading device is provided at the upper left of the developing tank 105 to set the cartridge 2 and supply the film 1. In FIG. The supply roller 30 and the cutter 31 that cuts the film 1 as described above are schematically illustrated.

Film 1 pulled out from cartridge 2
is pulled out by a supply roller 30, the tip thereof is cut by a cutter 31, and then immersed in the developer while being conveyed by a conveyance roller 111 and a reversing roller 112 provided in the developer tank 105. The film 1 immersed in the developer is
The paper is transported to the bleaching tank 106 by a transport roller and reversing roller 112 (not shown), immersed therein, subjected to bleaching treatment, and then transported to the fixing tank 107. The film 1 immersed in the fixer is then transported to a washing tank 108 , and the film 1 immersed in the three washing tanks 108 and washed with water is transported to a drying section 109 . Although not shown in each processing tank, the film 1 is guided by a film guide 21 shown in FIGS. 4 and 5. The drying section 109 is configured to blow out hot air as shown by the arrow along the transport path of the film 1, and the film 1 dried by the warm air is transported to a baking process (not shown).

In this way, the film 1 pulled out from the cartridge 2 is conveyed sequentially through the developing tank 105 and below, but at the stage when the film 1 is supplied to the developing tank 105, the leading end of the film 1 has a low friction surface. It has been cut to look like this. Therefore, there is no inconvenience such as the film 1 being conveyed getting caught in each tank, and not only can clogging of the film 1 or accidents associated with clogging can be prevented, but also the conveyance of the film 1 can be increased.

[0022]

As explained above, the undeveloped film according to the present invention is obtained by cutting the leading end of the film pulled out from the cartridge at an angle greater than or equal to a right angle at a position that does not overlap the perforations. Therefore, when transporting the film, the leading edge of the film does not get caught in the transport path.
Moreover, since the frictional resistance with the transport path is reduced, high-speed transport is possible, and automatic film development can be performed efficiently and accurately.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first example of an undeveloped film to which the present invention is applied.

FIG. 2 is a plan view of an undeveloped film.

FIG. 3 is a plan view showing a second example of an undeveloped film.

FIG. 4 is a perspective view showing a mode of conveyance of undeveloped film.

FIG. 5 is a sectional view of a main part showing a mode of conveyance of an undeveloped film.

FIG. 6 is an enlarged plan view of a main part showing catching of undeveloped film.

FIG. 7 is an enlarged perspective view of a main part showing catching of undeveloped film.

FIG. 8 is a system diagram showing the configuration of an automatic developing device.

FIG. 9 is a perspective view showing a conventional film drawing situation.

[Explanation of symbols]

1 Undeveloped film 2 Patrone 11 Perforation 100 Automatic developing device 105 Developing tank 106 Bleach tank 107 Fixer tank 108 Washing tank 109 Drying section θ Cutting angle r Cutting radius

Claims (1)

[Claims] Claim 1: An undeveloped film whose leading end is pulled out from a cartridge, and is cut so that the end of the side edge in the pulling direction forms an obtuse edge or an outwardly protruding arcuate edge, avoiding perforations. undeveloped film.