GB1329996A - Apparatus for transferring strip material - Google Patents

Abstract

1329996 Tape transports; brakes CANON KK 21 Sept 1970 [20 Sept 1969 26 Sept 1969] 44924/70 Heading G5R [Also in Division F2] Braking mechanism for a tape recorder comprises two brake wheels each rotatable with a respective reel in either direction, and brake shoes which can be brought into contact with both brake wheels to brake them, the shoes being arranged so that the brake wheels are braked only by brake shoes operating in an "escape direction" irrespective of the direction of rotation of the brake wheels. "Escape direction" is defined as that direction in which the (tangential) frictional force derived from the contact between shoe and wheel tends to decrease, rather than increase, the braking effect of the shoe on the wheel. As described, each wheel may have either one or two shoes associated with it, and in the latter case only one shoe is operative at any one time. As shown in Fig. 5, when brake wheel 23A is rotating as shown, and member 28A is moved to permit springs 21A, 22A, to act on arms 11A, 12A, respectively, in brake-applying direction, the brake torque developed moves arm 11A outward along pin 24A until little or no braking effect is exerted by shoe 13A, and moves arm 12A inwards and upwards, free of pin 25A, so shoe 14A is applied in the "escape" direction. (Link 18A may be stopped by pin 27A). In Fig. 7, by differently-shaped and orientated brake arms 111A, 112A, and appropriatelyplaced fixed pins 124A, 125A, it is shoe 113A which is applied and shoe 114A which is released during counter-clockwise rotation. In Fig. 10, arm 301A is urged leftwards by brake torque until holding lever 309A contacts pin 315A to cause application of the single shoe 302A in the "escape" direction. When the direction of wheel rotation is reversed, lever 301A is tilted in the opposite direction to cause brake application in the new "escape" direction. The greater spacing, from the wheel, of the righthand pivots and pins has the effect of providing that the braking force in the latter direction of rotation is less than that in the former. Fig. 15 shows a variant of Fig. 10. In Fig. 17, links and fixed pins are dispensed with: instead, pins 449 and 450 on brake arm 447 are accommodated in triangular slots of fixed mounting plates 451 and 452 respectively. In the embodiment of Fig. 5, where in the complete apparatus four springs such as 21A are provided, the strengths of the springs are so chosen that the wheel associated with the reel acting as supply reel for the time being has a greater braking force applied to it than the other wheel, to maintain the tape taut. Wire instead of tape may be employed.