Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Dual-column tension and speed controller for high speed tape transporter










Image Number 9 for United States Patent #4727440.

A closed loop, high-speed tape transporter (10) includes a vacuum supply (11A), a first vacuum column (40) operatively connected to the vacuum supply (11A) and positioned upstream from a pick-up head (100) and downstream from a tape bin (64) for receiving the loop of tape and exerting a vacuum-induced holdback tension thereon, a second vacuum column (50) operatively connected to the vacuum supply (11A) and positioned downstream of head (100) and upstream of the tape bin (64) for exerting a vacuum-induced pull forward tension on the tape in opposition to the holdback tension exerted on the tape by the first vacuum column (40). A motor-driven capstan (60) is positioned intermediate the pick-up head (100) and the second vacuum column (50). Capstan (100) is driven at a constant speed equal to the ideal reference tape duplication speed. Tape drive capstans (62A) and (70A) cooperate with the first and second vacuum columns (40) and (50) for moving the tape. A servo-control (42 ), (45), (48) senses changes in the position of the tape within the first vacuum column (40) and sends a signal to tape drive (70A) and a servo-control (58), (55), (56) senses changes in the position of the tape within the second vacuum column (50) and sends a signal to tape drive (62A). The speed of the tape is varied as it moves through the first and second vacuum columns (40), (50) thereby minimizing tension induced speed variation in the tape in the region of the pickup head (100).








 
 
  Recently Added Patents
Knife grip
Optical coherence tomography with multiple sample arms
Photoacoustic joulemeter utilizing beam deflection technique
Preserving user applied markings made to a hardcopy original document
Method and system for monitoring and treating hemodynamic parameters
Method and system for electronic assistance in dispensing pharmaceuticals
Multi-domain dynamic group virtual private networks
  Randomly Featured Patents
Methods and media for writing data to flash memory
Pedestal control circuit
Method and apparatus for reducing power requirements in a multi gigabit parallel to serial converter
Method and system for tracking computer hardware and software assets by allocating and tagging the asset with an asset tag barcode having a software distribution system (SDS) number and verify
Double-twist bunching machine
Dual panel liquid crystal display device
Power on/off in combined PDA/telephone
Fishing tackle pack
Hybrid gap measurement circuit
Silver paste for forming conductive layers