Cam arrangement for cassette loading mechanism having reduced slippage
AssigneeSony Corporation
InventorsSaburo Takasaki, Eiji Ohshima
Life of this patent
Estimating the term…
Abstract
A cam arrangement for a cassette loading mechanism includes a sliding chassis, slidingly mounted on a fixed chassis. When the chassis slides in one direction a cam pin is moved along a cam surface of a fixed cam provided on the fixed chassis to a second cam surface provided on a movable cam mounted to the movable chassis. Proximate a return side of an end of the first cam surface a return cam is provided such that, should misalignment occur between the first and second cam surfaces during tape loading or unloading operation, the cam may be returned to an initial position automatically.
Claims27
A cam arrangement for a video cassette recorder comprising:
- first and second relatively movable portions;
- a fixed cam operatively coupled with one of said first or second portions, said fixed cam including a first cam surface with a gap formed therein;
- a movable cam rotatably mounted on the relatively movable portion mounting said fixed cam, said movable cam having a second cam surface aligning the cam surface of said fixed cam according to a predetermined positional relation therebetween;
- a spring mounted at one end thereof to a portion other than that mounting said fixed and movable cams;
- an arm portion rotatably mounted on the portion mounting said spring means, said arm portion being connected to another end of said spring means and provided with a cam pin contacting said cam surfaces of said fixed and movable cams and urged by said spring means;
- and
- return means, formed in said relatively movable portion mounting said fixed and movable cams, said return means returning said cam pin to said first cam surface via said gap whenever said cam pin is dislodged from one of said cam surfaces;
- wherein said return means comprises a return cam, said return cam having an initial end of a cam surface thereof proximate a position where said alignment occurs between said first and second cam surfaces, and having a terminal end thereof at said gap in said first cam surface.
A cam arrangement for a video cassette recorder comprising:
- a first chassis member;
- a second chassis member, slidably disposed on said first chassis member for movement relative thereto;
- a fixed cam mounted on said first chassis member, said fixed cam including first and second cam surfaces each having engage and return sides respectively, said first and second cam surfaces defining a first gap therebetween;
- a movable cam rotatably mounted on said first chassis member, said movable cam including a third cam surface having engage and return sides thereof, said third cam surface being alignable with said second cam surface so as to be contiguous therewith according to a predetermined positional relationship between said cam arrangement, said second and third cam surfaces defining a second gap therebetween according to an occurrence of a non-aligned positional relationship therebetween;
- a tensioning member, mounted on said second chassis member, spring biased in one direction and rotatable according to movement of said movable cam, said tensioning member operatively coupled with a cam pin, said cam pin moving along an engage side of said first, second and third cam surface according to sliding movement of said second chassis member in a first direction and moving along a return side of said third second and first cam surfaces according to movement of said second chassis member in a second direction opposite said first direction;
- a return cam surface positioned adjacent a return side of said second cam surface, said cam pin being positioned in said second gap and proximate said return cam surface by said spring biasing in said one direction;
- and
- a return cam formed substantially between said return cam surface and said fixed cam and having a terminal end at said first gap, said cam pin, when in said second gap, moving along said return cam surface and along said return cam.
Dependencies are inferred from the claim text.