A continuously rotating driver and an element to be intermittently indexed are mounted on parallel axes. The driver has an oblong actuating portion that engages generally radial projections of said element. Adjacent projections are separated by spaces whose opposite sides converge towards the axis of said element. The contour of the actuating portion is free of concave curvature while said projections have sides with convex and concave curvature. Preferably the oblong actuating portion is shaped...

An indexing mechanism for playing a plurality of messages on a phonograph record sequentially by stopping the record at predetermined reversely rotated positions following playing of each message. A first stop on the record engages a third stop on a carrier frictionally coupled to the record for movement thereby during reverse rotation until a second stop interrupts movement of the carrier with the record coincident to movement of the third stop into the path of travel of the first stop. The car...

A tool turret mounted for rotation about and axial movement with a threaded sleeve carried by a base. The freely rotatable turret is selectively locked to the base by a locknut carried by the base and threadingly engaging the sleeve which axially displaces the tool turret to urge curvic couplings fixed to the turret and the base into locking engagement. The turret is rotated or indexed by a rack and a gear fixed to the turret for axial and rotary movement therewith. The gear and rack both have s...

Indexing apparatus includes a housing, a rotatable indexing shaft mounted in the housing, a spider mounted on the shaft for rotation therewith, a plurality of rollers equally spaced about the periphery of the spider, and an indexing bracket mounted in the housing for movement transversely of the shaft. A stop block on the bracket engages one of the rollers to prevent rotation of the spider. A slotted arm on the bracket engages another roller to rotate the spider when the first roller is disengag...

An indexing, or positioning, device for a table guided for movement on a base. The positioning device comprises a pair of indexing discs connected via a totalizing transmission with the table to be positioned. Each indexing disc is driven through a differential transmission from a pair of motors, each of which has a brake to lock the motor when it is deenergized. Presettable counters control the motors and a pulse generating device associated with each disc feeds countdown pulses to the counters...

An indexing device provides a bookmark for a reader to indicate the reader's place in the book for successive reading sessions. The device includes a flexible prong held in position between two leaves of the book from an edge location by an arm member. The arm member is preferably pivotally secured to a base that releaseably attaches to the book. Several embodiments showing different mounting structures are described.

An electromagnetic linearly indexing actuator in which a shaft is mounted for linear motion in the direction of its axis. A pair of electromagnetic stator assemblies are carried in fixed position coaxially spaced from each other in the direction of the shaft axis. Each stator assembly has an associated armature which is slidably carried by the shaft, and a spring for urging each armature away from its associated stator. A latch is pivotally mounted at one end to each armature eccentrically of th...

An indexing and positioning device comprises: a fixed inner ring; and outer ring disposed coaxially, coplanarly, and revolvably therearound with an annular boundary therebetween; a plurality of positioning recesses formed at equal indexing intervals along and straddling the boundary and comprising respective inner and outer parts respectively formed in the inner and outer rings, all recesses assuming a completely assembled state upon combination of the inner and respective outer parts in a speci...

In an indexing mechanism for advancing a transducer with respect to a rotated disk to record and/or play back information on the disk, the transducer is mounted on a cylindrical carrier having a flat surface along one of its sides. A fixed guide supports the carrier for longitudinal movement along a reference axis defining the direction of travel of the carrier relative to the rotated disk. The carrier is moved by a stepper motor which rotates a lead screw in threading engagement with the carrie...

There is provided a tool-magazine indexing device for rapidly indexing tools by the utilization of pressure oil, which comprises a tool-magazine housing a number of tools, a cylindrical feed-back shaft making one rotation in synchronization with one circumferential movement of the tool-magazine and a command input shaft inserted in the cylindrical feed-back shaft so as to rotate for indexing purposes corresponding to the number of the tools in the tool-magazine so that an indexing operation by t...