Patent GB-1451689-A (GB)
Title: Magnetic tape recording and/or reproducing apparatus
IPC: G11B15/18
Filed: 1974-07-18
Abstract: 1451689 Magnetic tape recorders SONY CORP 18 July 1974 [9 Aug 1973] 31913/74 Heading G5R The tape transport of a reel-to-reel magnetic tape recording and/or playback apparatus has reel supports 23, 24, Fig. 3, for rotational coupling with respective tape reels, an idler wheel 112 engageable with a main drive wheel 92, 106, 108 and with support 24 to drive the latter, means for engaging idler 112 against support 24 upon deactivation of the tape drive with sufficient force to brake support 24, and a brake 156, 158 selectively engageable with the support 23, the tape transport being operable so that idler 112 and brake 156, 158 are brakingly engaged against their respective reel supports 24, 23 in rapid succession so that the driven reel support is braked before the other reel support, which free wheels during drive of the driven support, upon deactivation of the tape drive. A motor 82, Fig. 3, of a cassette tape machine drives a capstan 21 flywheel 90 and a main drive flywheel 92 via a belt 88. A trident-shaped member 130, Fig. 5, is coupled to rewind button 28, play button 32 and fast forward button 34 whereby depression of any one of these buttons slides member 130 to close a switch 142 to energize motor 82 and to pivot a lever 146 to release the brake 158, Fig. 5, thereon from reel support 23. Pressing play button 32 for the PLAY or RECORD mode also moves actuator bar 32' to advance carriage 60 supporting heads 78, 80 and pinch wheel 74, such advance causing carriage 60 to engage a lever 114 to disengage the idler wheel 112 thereon from engagement between reel support 24 and a friction wheel 106 mounted with flywheel 92, and a pin 100 rides along a lever 94 to engage in a notch (165), Fig. 6 (not shown), therein thereby allowing spring 98 to pivot lever 94 to engage friction wheel 108, mounted with flywheel 92 on lever 94, with reel support 23 to slow forward drive the tape. Upon completion of the play or record mode the apparatus is switched off, e.g. by an auto-shut-off mechanism as disclosed in Specification 1451688, or by STOP button 30 whereupon reel support 23 is braked by brake 158 before idler 112 re-engages between friction wheel 106 and reel support 24 to brake the latter and rotate it slightly clockwise to tighten the tape in the cassette. When REWIND button 28 is depressed, member 130 releases brake 158, energizes motor 82 and acts on lever 114 via spring 121, Fig. 3, and lever 118 to more tightly engage idler 112 between friction wheel 106 and reel support 24 to drive the latter at fast rewind speed. On stopping of rewind, idler 112 remains engaged between wheel 106 and reel support 24 to brake the latter before reel support 23 is braked by brake 158. On pressing FAST FORWARD button 34, member 130 again releases brake 158 and energizes motor 82, and fast forward actuator 34 acts on lever 114 via bellcrank 178, Fig. 7, lever 186 and spring 188 to disengage idler 112 from reel support 24 and engage it with idler 190 which is engaged with friction wheel 194 of reel support 23 whereby the latter is driven from flywheel 92. On stopping of fast forward wind, reel support 23 is again braked before idler 112 reengages reel support 24 to brake the latter and rotate it slightly clockwise to tighten the tape. In a modification, Fig. 8 (not shown), the reel support 24 is braked by the idler 112 becoming engaged between support 24 and a stationary braking member (202), rather than between support 24 and wheel 106. A further embodiment, Fig. 9, has a tridentshaped member 130 operated by any of rewind button 28, play button 32 and fast forward button 34 to energize motor 82 which, via belt 88, drives capstan flywheel 90 and main drive flywheel 210 in opposite directions, with a belt 214 driving auxiliary flywheel 216 on lever 94. Reel supports 23, 24 are braked by respective idlers 230, 232 on levers 222, 224 and normally engaging between flywheels 90, 210 and the associated reel support. On pressing button 32 for PLAY or RECORD mode, pin 100 on actuator 32' engages notch 165 of lever 94 whereby spring 98 engages friction wheel 260, mounted with flywheel 216, to slow forward drive support 23, a pin 262 on actuator 32' having acted via links 236, 254 to pivot idlers 230, 232 to non-braking positions. On stopping of play or record, idlers 230, 232 re-engage and simultaneously brake and slightly counter-rotate their associated reel supports 23, 24 to stop and tighten the tape in the cassette. On pressing REWIND button 28, actuator 28'acts via bellcrank 238 and link 236 to move idler 230 to its non-braking position with idler 232 remaining engaged between flywheel 210 and reel support 24 to fast rewind the latter. Similarly on pressing FAST FORWARD button 34, idler 232 is moved by means of bell-crank 256 and link 254 to its non-braking position and support 23 is fast wound by flywheel 90 and idler 230. On stopping rewind or fast forward wind idler 230 or 232 re-engages with support 23 or 24 respectively to brake the latter and rotate it slightly to tighten the tape, support 24 or 23 respectively being braked by means of its respective idler 232 or 230 remaining engaged therewith.