JPH02235051A - Roll film for photography having light shielding paper with adhesive agent - Google Patents

Abstract

PURPOSE:To facilitate the production of the above film and the loading of the film to a camera by applying tacky adhesive glue on both ends of light shielding paper, bringing one thereof into pressurized contact with a spool, detaining the light shielding paper thereto and bringing the other into pressurized contact with a wound scroll surface. CONSTITUTION:The front end 107A and rear end 107B of the light shielding paper 3 to be used for a Brownie film, etc., is coated with the tacky adhesive glue 107 and the rear end of the film 12 is joined to the paper 3 by an adhesive tape 13. The glue 107 at the front end 107A is brought into pressurized contact with a winding shaft 102 of the spool 101 and the paper 3 is wound together with the film 12. The loosening of the paper 3 is stopped by the glue 107 at the rear end 107B. The rear end 107B is stripped and the glue 107 is brought into pressurized contact with the spool of a winding chamber, then the film is wound at the time of loading this roll film into the camera. Either one end of the paper 3 may be made into a slit insertion system.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in light-shielding paper constituting photographic roll films.

[Conventional technology]

120 size photographic roll film is shown in Figure 7 and Figure 1.
As shown in Figure 3, a light-shielding paper 3 and a photographic film 12 are glued together with an adhesive paper 13 and wound around a spool L, and although not shown, a 220-size photographic roll film has two ends of the photographic film. are joined to light-shielding paper called a leader and trailer, and wound around a spool. In any case, the end portion 7 at the end of the winding is folded back along the line 6 in FIGS. 9 and 10, and a seal 4a as shown in FIG. 8 is placed on top of it as shown in FIG. It was wound in one or more turns into a strip and pasted with a hot melt adhesive 5 to prevent it from unraveling.

When loading such a roll film into a camera, tear the seal 4a and remove the first roll film on the core of the roll film.
Attach the spool shown in Figure 1 to the film stock section of the camera, and insert the unraveled tip of the light-shielding paper into the slit hole 11 of the spool of the same size as the core spool attached to the camera's winding section. do. Then, as shown in FIG. 12, the fold line 6 of the light-shielding paper completely fits into the slit, making it impossible to insert it any further. In this state, the desired design target for the camera was 0.2 kg.
Winding is started using a driving force that generates a pull-out load of 0.3 kg, and the film is sequentially wound as each frame is photographed.

After the shooting is finished, the professional film that has been wound is taken out of the camera and a non-unraveling seal 4 is placed at the end of it.
b is attached and sent to development processing.

Here, winding may be performed manually by the photographer using the camera's knob, or may be performed by an electric motor built into the camera. However, the torque is adjusted to be approximately constant and is generally designed to produce a pull-out load of 0.2 kg to 0.3 kg on the film, which is a desirable goal for cameras.

Also, when inserting the tip of the light-shielding paper into the slit of the spool and winding it up for the first time, press the light-shielding paper against the spool by hand so that the tip does not come off the slit.
After winding up ~3 turns, steady winding was performed.

[Problem to be solved by the invention]

As mentioned above, if winding is started with the leading edge of the light-shielding paper inserted into the slit of the take-up spool attached to the camera, the leading edge of the light-shielding paper often comes out of the slit and cannot be wound.To prevent this. for the first 2
For 3 to 3 rolls, a person had to use his or her fingers to help prevent the rolls from unraveling while loading the rolls.

Such operations are extremely undesirable in handling and disseminating cameras and photosensitive materials.

Furthermore, since such films are often manufactured in light-tight manufacturing rooms or equipment, it is necessary to confirm whether the spool and the film have completed the locking process in a stable manner. However, since the confirmation process is complicated, a stable and reliable engagement means that eliminates the need for the confirmation process is desired.

An object of the present invention is to solve these problems and provide a photographic roll film that can be manufactured by reliable means and that can be loaded into a camera simply, reliably, and with peace of mind.

[Means to solve the problem]

The purpose of this is to apply tack adhesive glue to the leading and/or rear end of the light-shielding paper, press one end of the adhesive to the outer peripheral surface of the winding shaft of the spool, and lock the light-shielding paper together with the film. Winding is accomplished by a photographic roll film characterized in that the other end of the light-shielding paper is pressure-adhered to the outer peripheral surface of the scroll being wound up.

〔Example〕

Examples of the present invention are shown in FIGS. 1, 2, and 3. , Figure 4,
This will be explained using FIGS. 5 and 6. However, the present invention is not limited to this embodiment.

FIG. 1 shows the photographic roll film of the present invention developed and its component structure clarified. The leading end 107A of the light-shielding paper 3 is pasted and secured to the outer periphery of the winding shaft 102 of the spool 101 via a tack adhesive glue 107 applied thereto. Then, the light-shielding paper 3 is wound onto the spool 101, and on the way, the leading edge 12A of the film l2 touches the light-shielding paper 3.
It is rolled up together with the light-shielding paper at a certain distance from the tip of the 7-ilm 12, and when the winding is finished, the rear end 12B of the seven ilms 12 and the back surface of the light-shielding paper are joined with an adhesive tag l3, and it is further rolled up as it is until it reaches the rear end 107B. The tack adhesive glue coated on the inside is applied to the outer circumferential surface of the light-shielding paper and prevents the rolled-up light-shielding paper from unraveling. That is, the photographic roll film is made into a photographic roll film as shown in the perspective view of FIG. 3, and is further packaged and shipped.

Note that tack adhesive glue always maintains its tackiness, and by pressing a sheet of paper or other material coated with it,
Demonstrates strong adhesive strength. However, when the sheet at the adhesive portion is peeled off, the bond with the mating member simply comes undone. Moreover, since the adhesiveness is maintained, when it is pressed again to the same object or another object, it can be bonded as strongly as before.

Therefore, when loading a 120 or 220 type photographic roll film into a camera, remove the empty spool from the film loading chamber of the camera, transfer it to the take-up chamber, and insert a new roll film into the film loading chamber as shown in Figure 3. is loaded, the terminal part 107B of the light-shielding paper 3 is peeled off, the film is passed through the running surface of the film inside the camera, and it is pressed against and pasted onto the winding shaft 102 of the spool lot transferred to the winding chamber, and winding begins as it is. The strong locking force allows the paper to be wound stably without peeling off in the middle, and when each photographic frame is taken, the light-shielding paper is conveyed to the winding side and the light-shielding paper terminal 1
07A is naturally peeled off from the winding shaft of the spool 101 and conveyed as it is to the take-up chamber, and the light-shielding paper terminal 107A is stuck to the outer peripheral surface of the photographed film with tack adhesive to prevent it from unraveling, and is taken out from the camera and developed. You will be left with a lot of trouble.

At this time, it is desirable that the film running surface inside the camera be treated with a fluorine-based resin. This makes it possible to prevent the running surface from being contaminated with glue when the tacky adhesive portion of the light-shielding paper passes through.

It is also possible to wind up the film after shooting the entire screen, stop the camera at the stage where it is peeled off from the spool 101, open the camera, remove the end of the light-shielding paper from the film running surface of the camera, and wind it up. be.

As shown in FIG. 2, the tack adhesive glue is notched to form an end shape at each measuring length L, which is the length of one piece of light-shielding paper 3, and the cutting waste 108 is cut off. A long sheet of light-shielding paper is formed, and a tack adhesive glue 107 is applied to that portion as shown by hatching in the figure.

The Conotack adhesive needs to have a composition that does not contaminate the film manufacturing process and the camera travel path, and also adheres well to the light-shielding paper 3.

Furthermore, the terminal portions 107A and 107B of the light-shielding paper 3 are shown in FIG.
), (b), (c), and (d), and the coating size B of the tack adhesive glue 107 can be set to any desired length. t;Tack adhesive glue 1
07 is applied up to the end of the terminal part as shown in Fig. 4 (a) and (b), and the part 07 is applied only to the hatched area, leaving the end part 107c a little longer than C. Figure (C
) and (d), which are very convenient and easy to peel off when the unraveled end of the light-shielding paper is peeled off after winding.

Also, in this case, it is easier to cut a long piece of light-shielding paper to a length because no glue is applied to this part.

Also, as shown in Figure M5 and Figure 6, the volume 1 of the spool 101 is
It is more convenient to provide recesses 104 and 105 in the shape of the terminal parts 107A and 107B on the surface of 102, since the locking state can be performed accurately without getting stuck or shifting.

Further, the spool 101 may have a slit 111. That is, the conventional spool can in principle be used as is.

Note that it is desirable that one end of the light-shielding paper is printed with photographed characters, and the other end is printed with unexposed characters. This provides benefits to the user.

It is also useful to use a tack adhesive adhesive method for only one of the leading and trailing ends of the light-shielding paper, and use a slit insertion method for the other end.

〔Effect of the invention〕

As in the present invention, by using tack adhesive as the locking means between the spool of a roll film using light-shielding paper such as L20 or 220 type and the end portion of the light-shielding paper, a strong locking force can be achieved during winding. It has become possible to provide a means that does not easily peel off, and that allows the end portion of the light shielding paper at the end of winding to be easily peeled off naturally and smoothly when removed from the conventional spool. With the present invention, it is now possible to use existing shutters as they are, simplifying the manufacturing process, and eliminating the concerns of photographers who load film into a camera and take pictures about it coming loose. .

[Brief explanation of drawings]

FIG. 1 is a plan view showing the structure of a developed photographic roll film of the present invention. Figure 2 is a processing diagram of a long piece of light-shielding paper. FIG. 3 is a perspective view of the photographic roll film of the present invention. FIG. 4 is a diagram showing the shape of the end portion of the light-shielding paper used in the present invention and the glue application area. FIG. 5 is an axis-perpendicular cross-sectional view of the spool used in the present invention. FIG. 6 is a side sectional view of the spool used in the present invention. Figure 7 is a perspective view of Jubei's photographic roll film. Figure 8 is a plan view of the envelope. FIG. 9 is a plan view of a conventional photographic roll film in a state where the seal has been removed and the leading edge of the light-shielding paper has been stretched out. Figure lθ is a side view of a conventional photographic roll film in its natural state, with the seal still unwrapped. Figure 11 is a plan view of Sugur. FIG. 12 is a side view of a conventional photographic roll film with the tip of the light-shielding paper inserted into the slit of the take-up spool. FIG. 13 is a plan view showing the structure of a conventional photographic roll film developed. 3... Light-shielding paper 101... Spool 10
3...7 lunge 107...tack adhesive glue 107A. 107B... Light-shielding paper terminal section 107G...
edge

Claims (1)

[Claims] Applying tack adhesive glue to the leading and/or trailing end of the light-shielding paper, pressing one end of the end to the outer peripheral surface of the winding shaft of the spool and locking it, and winding up the light-shielding paper together with the film; A photographic roll film characterized in that the other end of the light-shielding paper is pressure-adhered to the outer peripheral surface of a wound scroll.