JP2789221B2 - Film transport device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film transport device having a sprocket for feeding a perforated film to a load section.

[Conventional technology]

When a photographic film is manufactured, perforations are previously perforated in a long film by a perforator, and the long film is cut into fixed lengths for each one and wound around a spool. At this time, the long film 12 is usually sent out by a sprocket 11 as shown in FIG. 2 and passed through a guide chute 13, a cut and puncher section 14 and a loop chute 15 in order, and the cut and puncher section 14 is operated to operate the film 12
Was cut into a tongue end shape.

[Problems to be solved by the invention]

However, the loop chute 15 is a sprocket
It becomes a big load on the film sent out at 11. Therefore,
A sprocket is mounted on the load section F such as the loop chute 15.
When the film 12 is fed with only the conveying force of 11, the film
12 into the gap 17 with the guide chute 13 provided on the inlet side of the load portion F as shown by a two-dot chain line.
Sliding on the cover 11 'covering the upper surface of the
In some cases, scratches and static were generated on the 12 photosensitive surfaces. It also hindered the correct scale.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a film transporting apparatus which has a simple structure and a small size and has good film transportability. Another purpose is to damage the surface of the film during transport,
An object of the present invention is to provide a film transport device that does not cause static.

Still another object is to provide a film transport device capable of high-speed transport.

[Means for solving the problem]

In order to achieve the above object, the present invention relates to a film transport device having a sprocket for feeding a perforated photographic film to a load unit, wherein a feed roller capable of nipping the outside of the film perforation at the entrance side of the load unit. And a pad roller, the feed roller and the sprocket are connected to each other via a timing belt so that the linear velocity of the feed roller is slightly increased, and the pinching force between the pad roller and the feed roller is The film is adjusted so as to be able to slip slightly with respect to the film sent from the sprocket, so that the flatness of the film can be easily ensured. Further, it is configured so as not to damage the photosensitive surface of a photographic film as a photosensitive member. Further, it is configured such that high-speed stable transport of the film can be ensured.

〔Example〕

Next, the present invention will be described based on the embodiment shown in FIG. The same parts as those in FIG. 2 are described by the same reference numerals.

In the figure, reference numeral 19 denotes a feed roller disposed close to the guide chute 13, and reference numeral 20 denotes a pad roller which presses the upper surface of the feed roller 19 and holds the film 12 therebetween. The feed roller 19 is connected to the sprocket 11 for sending out the film 12 via a timing pulley 21, a timing belt 22, and a timing pulley 23, so that the film 12 can be conveyed synchronously.

In this case, the feed roller on the tension side of the film 12
The linear speed of 19 is adjusted to be slightly higher than the linear speed of sprocket 11. This adjustment is performed on the timing pulley.
It becomes possible by changing the radius of 21 and 23. That is, the reason why the linear speed of the feed roller 19 is slightly higher than that of the sprocket 11 is that the film 12 sandwiched between the feed roller 19 and the pad roller 20 slips by the speed difference,
This is because the back tension is applied to the film 12 and flatness can be imparted. As a result, the film can be stably fed into the load portion F such as the loop chute 15 having a large conveyance resistance, and high-speed conveyance is realized. However, in order to prevent the photosensitive surface of the film 12 from being damaged by the slip, the feed roller 19 and the pad roller 20 are adjusted so that a slip of about 0.075 to 7.5% occurs.

Further, in order to transport the film as fast as possible, it is necessary to effectively prevent the generation of static electricity due to friction (slip) between the film and the feed roller 19 and the pad roller 20 sandwiching the film. To this end, both the feed roller 19 and the pad roller 20 are formed of conductive rubber rollers, and the rubber hardness thereof is set to 50 ° or less so that the web clamping point is not deformed.

Furthermore, for high-speed film transport, the nip pressure between feed roller 19 and pad roller 20 (considered as line contact)
It is good to adjust to about 120g / mm or less.

〔The invention's effect〕

As described above, the present invention relates to a film transport device including a sprocket that feeds a perforated photographic film to a load unit, wherein a feed roller and a pad capable of nipping the outside of the film perforation at an entrance side of the load unit are provided. Rollers, the feed roller and the sprocket are connected to each other via a timing belt so that the linear velocity of the feed roller is slightly increased, and the pinch force between the pad roller and the feed roller is reduced by the sprocket. This is characterized in that the film is adjusted so as to be able to slip a little with respect to the film sent from the printer, so that the film transportability is improved.

Further, in the present invention, the feed roller and the pad roller, which hold the film, are adjusted so as to be able to slip to some extent, so that the film is not damaged and the film can be transported at high speed.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of the apparatus of the present invention, and FIG. 2 is an explanatory view of a conventional example. 11 Sprocket 12 Film 13 Guide chute 14 Cut and puncher 15 Loop chute 19 Feed roller 20 Pad roller 21, 23 Timing pulley 22 Timing belt F Load section

Claims (1)

(57) [Claims] 1. A film transport device having a sprocket for feeding a perforated perforated photographic film to a load portion, wherein a feed roller and a pad roller capable of sandwiching the outside of the film perforation are arranged at an entrance side of the load portion. The feed roller and the sprocket are connected to each other via a timing belt so that the linear velocity of the feed roller is slightly increased, and the pinch force between the pad roller and the feed roller is sent out from the sprocket. A film transport device characterized by being adjusted so that it can slip slightly with respect to the film.