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Reflective Sensing of Tape Diameter on Reel

IP.com Disclosure Number: IPCOM000092392D
Original Publication Date: 1967-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Larson, RT: AUTHOR

Abstract

The device provides an indication of when a particular quantity of tape, film or similar strip material remains on a reel. The beam from a light source is passed through one flange of the reel, reflected at the other flange and sensed by a photocell-type device. The device is particularly useful for warning that a machine reel which is in a high-speed rewind mode is nearing the last few feet of tape left on its hub.

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Reflective Sensing of Tape Diameter on Reel

The device provides an indication of when a particular quantity of tape, film or similar strip material remains on a reel. The beam from a light source is passed through one flange of the reel, reflected at the other flange and sensed by a photocell-type device. The device is particularly useful for warning that a machine reel which is in a high-speed rewind mode is nearing the last few feet of tape left on its hub.

Reel 10 has front flange 11 and rear flange 12. Aperture 15 in 12 is arranged for receiving light from source 16 so as to illuminate reflective surface 18. The latter redirects the light from 16 into photocell detector 20. The presence of sufficient tape on 10 to block 11 prevents an output from 20. During a high- speed rewind, the removal of sufficient tape from 10 to expose 11 results in a signal from 20 indicating that the last few feet of tape are about to be unwound from 10. By devices not shown, the output of 20 is then used to initiate deceleration from the high-speed rewind condition to a low-speed terminal rewind mode. Since 16 and 20 can be mounted in a relatively flush position within the tape drive, the system is substantially impervious to ambient light.

Reflector 18 can be a segment as shown or a continuously circumferential strip on the interior of 11 but would preferably be recessed as shown in the section drawing. A plurality of apertures such as 15 can be provided or 12 can be fabricated of...