U.S. Philips Corporation

Norbert Vollmann

Leopold Mader

Harald Fleck

A gear mechanism (1) is selectively reversible between two end positions and which comprises a driving gear member (3), which can alternately be driven in opposite driving directions (19, 20) and a driving member (5) which can be driven by said driving gear member, one gear member (3) being partly toothed to form a toothed portion (8) which is bounded by two end faces (6, 7). The gear members can be brought into and out of mesh with each other. For bringing the two gear members (3, 5) into mesh with each other in at least one driving direction (19, 20) of the relevant gear member (3) said members carry a pair of actuating stops (34, 35, 43, 44) which correspond to the relevant driving direction, which are axially offset relative to the teeth (8, 9), and which each comprise a stop surface (36, 37, 45, 46) whose geometry is in conformity with that of a tooth-flank surface (38, 39, 47, 48). At least one (35, 44) of the pairwise cooperating actuating stops (34, 35, 43, 44) extends beyond the addendum circle of the toothed portion (9) of the gear member (5) carrying this actuating stop (35, 44), its stop surface (37, 46) being prolonged in conformity with the tooth-flank geometry. The actuating stops (34, 35, 43, 44) cooperate pairwise via their stop surfaces (36, 37, 45, 46) to bring the gear members (3, 5) into mesh with each other.

Gear mechanism

A recording and/or reproducing apparatus (1) for a magnetic tape (3) that can be drawn out of a cassette (2) introduced into the apparatus is provided for wrapping the magnetic tape around a drum-shaped scanning device (15) of the apparatus with a tape guide device (29), which has at least one tape guide (32,33) which is displaceable by means of a displacement device (30) between a rest position and an operating position and which in its operating position is positioned by means of a positioning device (68) arranged on a displaceable support (70), while it keeps the magnetic tape (3) wrapped around the scanning device (15). For adjusting the tape tension when the magnetic tape (3) wrapped around the scanning device (15) is driven, the apparatus (1) is provided with a tape tension adjustment device (12) comprising a tape tension indicator. The tape guide (32,33) situated in its operating position is disengaged from the displacement device (30) for this guide and is kept urged against the positioning device (68) by means of an urging device (78) provided on the support (70) for the positioning device (68), while the support (70) for the positioning device at the same time constitutes the tape tension indicator of the tape tension adjustment device (12).

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Wiener Neudorf, Austria

Norbert Vollmann