A pawl and ratchet device actuated by a solenoid for rotating the cam of a cartridge-type tape player to position the magnetic tape head adjacent different tracks on the tape includes a unitary plastic pawl element having an opening therein for receiving the ratchet wheel and further having first and second pawls integrally formed as part of the pawl element and attached to the sides of the opening thereof by a restricted portion forming a spring biasing the pawls into engagement with the ratche...

An indexing mechanism for sequentially presenting each of a plurality of cassettes containing photographic film to a projection station in a film projector. The indexing mechanism includes two pairs of stop members on sliding plates that are alternately placed in and out of engagement with an abutment on the cassettes.

An indexing mechanism for sequentially presenting each of a plurality of cassettes containing photographic film to a projection station in a film projector. The indexing mechanism includes a pair of stop members that are alternately placed in and out of engagement with an abutment on the cassette.

An indexing mechanism for angular or linear division combining the principles of interlocking teeth, the vernier and the ratchet. Two discs or linear plates having a plurality of interlocking surfaces of different pitches, are joined by a third disc or plate, having a set of interlocking surfaces to match the pitches of the other two. Some of the pitches are not evenly divisable into a circle and do not extend completely around the discs, and a ratcheting type movement is used to accomplish the ...

An indexing arrangement for repetitive, accurate positioning of a movable part relative to a fixed one which comprises a cylindrical cavity in the fixed part, terminating at the intended plane of movement at least one cylindrical cavity in the movable part also terminating at said plane and having a diameter as near equal to that of the diameter of the cavity of the fixed part as is possible and a cylindrical pin able to slide with clearance in the cavity of the fixed part. The pin is projected ...

An indexing mechanism for sequentially presenting each of a plurality of cassettes containing photographic film to a projection station in a film projector. The indexing mechanism includes an escapement member having two pairs of stop members that are alternately placed in and out of engagement abutments on the cassette.

A high-speed indexing mechanism, for moving a member to a printing position, which includes an indexing shaft on which are mounted an indexing drive wheel and a clutch member operated by a cam follower arm. A cam member rotates the cam follower arm to drive the indexing shaft, which moves the member to a printing position by means of the indexing drive wheel. The clutch allows the indexing shaft to be rotated in one direction by the cam follower arm. A second clutch member is mounted on the inde...

An indexing mechanism wherein an index wheel having a number of spaced projections around a periphery thereof is indexed by means of an indexing mechanism which is moved to and fro to engage in turn the said projections and wherein there is a leaf spring which acts on the projections to urge same forward to the desired index position or rearwards to the desired index position.

A pawl and ratchet device actuated by a solenoid for rotating the cam of a cartridge-type tape player to position the magnetic tape head adjacent different tracks on the tape includes a unitary plastic pawl element having an opening therein for receiving the ratchet wheel and further having first and second pawls integrally formed as part of the pawl element and attached to the sides of the opening thereof by a restricted portion forming a spring biasing the pawls into engagement with the ratche...

The fixture has a conventional three-clamp scroll chucking device for clamping it at the end of a shaft or a pinion, and a dial attached to this device. A vernier plate with a water level or a similar leveling means is rotatably mounted on the dial plate for precisely indexing the shaft or pinion to which the device is attached, to any required angular setting for machining operations on the shaft or pinion such as milling, drilling, planing and the like operations.