The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 1997
Filed:
Feb. 16, 1996
Kenji Takata, Kanagawa, JP;
Hiroshi Nakahashi, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
When drawbacks which prevent driving of a portion to be driven arise, an excessive load is not applied to components in a drive system so that damage of the components can be prevented. Thrust force, i.e., force in the direction along an axis of rotation (in the direction of arrow B) is applied to a movable worm gear due to the excessive load. When the thrust force becomes larger than urging force of a compression coil spring, the movable worm gear moves axially in the direction of arrow B against the urging force of the compression coil spring. A pin is disengaged from a groove by the axial movement of the worm gear so that the torque of the rotating shaft is not transmitted to the worm gear. As a result, the drive force is not transmitted to the drive system of the downstream side of the movable worm gear. Accordingly, damage such as breakage of teeth of gears due to the excessive load applied to each gear can be prevented.