Title:
SPROCKET AND FILM WINDING DEVICE
Document Type and Number:
Japanese Patent JP3670408
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To surely perform the one-frame feeding of photographic film by slight force.
SOLUTION: Two pairs of teeth 66 and 67 successively engaged with a pair of perforations of the photographic film arranged with short intervals when the pair of perforations are moved are respectively provided at the positions separated by 180° of the peripheral surface of a sprocket 61. Since the radius of a wider circumferential surface 61a is larger than the radius of a narrower circumferential surface 61b, the surface of the photographic film is strongly pressed to the circumferential surface 61a after large teeth 66 are disengaged from large perforations at the time of the one-frame transfer of the photographic film. The sprocket 61 is simultaneously pressed in a follower rotating direction by the pressing force to such an extent that load is not applied to the winding operation of a pressing spring 62, so that the sprocket 61 is surely rotated in accordance with the transfer of the photographic film and is moved to a standby position where small teeth 67 abut on the photographic film.
Inventors:
Hiroshi Katsura
Application Number:
JP22666396A
Publication Date:
July 13, 2005
Filing Date:
August 28, 1996
Export Citation:
Assignee:
Fuji Photo Film Co., Ltd.
International Classes:
G03B1/24; G03B17/00; (IPC1-7): G03B17/00; G03B1/24
Domestic Patent References:
| JP5045720A | ||||
| JP7005526A | ||||
| JP7319017A |
Attorney, Agent or Firm:
Kazunori Kobayashi