Photography – With film drive – Mechanical detail
Reexamination Certificate
1997-12-19
2001-01-09
Gray, David M. (Department: 2851)
Photography
With film drive
Mechanical detail
C396S418000
Reexamination Certificate
active
06170999
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a power transmission device for winding and rewinding a film in a camera or the like, and to an apparatus using the same.
2. Description of Related Art
Among various types of photographic films, there is a type of film in which a film leader part is stowed in a cartridge until use thereof and, after the cartridge is loaded in the camera or the like, a film is thrust out from the cartridge with a spool disposed within the cartridge (hereinafter referred to as the cartridge spool) driven by a film transport mechanism disposed inside the camera or the like, as disclosed in U.S. Pat. Nos. 4,832,275 and No. 4,834,306. Such a type of film is hereinafter referred to as the thrust type.
Further, there have been proposed various kinds of technique for winding a film thrust out from the thrust-type cartridge onto a take-up spool disposed in the camera or the like by driving the take-up spool and for rewinding the film into the cartridge by driving the cartridge spool, as disclosed in (i) Japanese Laid-Open Patent Application No. HEI 3-206435, (ii) Japanese Laid-Open Patent Application No. HEI 3-287150, (iii) Japanese Laid-Open Patent Application No. HEI 6-265989, etc.
For example, in the technique disclosed in (i) Japanese Laid-Open Patent Application No. HEI 3-206435, the change-over from a film thrusting-out operation by the driving of the cartridge spool to a film winding operation by the driving of the take-up spool is smoothly performed by utilizing a one-way clutch.
Also, in the technique disclosed in (ii) Japanese Laid-Open Patent Application No. HEI 3-287150, two transmission route channels are arranged to be selectively used to make smooth the change-over from a film thrusting-out operation by the driving of the cartridge spool to a film winding operation by the driving of the take-up spool, without using any one-way clutch.
Further, in the technique disclosed in (iii) Japanese Laid-Open Patent Application No. HEI 6-265989, a sun gear is disposed at the last stage of a reduction gear train, and is provided with two planet gears. One of the two planet gears is arranged to be used for performing a film winding operation by the driving of the take-up spool, and the other is arranged to be used for performing a film thrusting-out operation by the driving of the cartridge spool, so that the change-over from the film thrusting-out operation to the film winding operation can be smoothly performed with a compact gear train arrangement.
However, each of the above-mentioned kinds of technique has presented a problem in that there are required at least two channels of driving power transmission for driving the cartridge spool and for driving the take-up spool, thereby disadvantageously increasing the size of the device.
BRIEF SUMMARY OF THE INVENTION
In accordance with one aspect of the invention, there are provided a power transmission device for a camera or the like and an apparatus using the power transmission device, comprising a spool gear disposed at a film take-up spool and an output gear that outputs a driving force transmitted to the spool gear, so that the spool gear is used as an intermediate gear in transmitting the driving force, thereby enabling reduction in size and cost of the device.
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patent: 0 424 938 A2 (1991-05-01), None
Canon Kabushiki Kaisha
Gray David M.
Robin Blecker & Daley
LandOfFree
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