公开(公告)号：US3904148A

公开(公告)日：1975-09-09

申请号：US46425974

申请日：1974-04-25

Applicant: IBM

Inventor： CLOUD SAMUEL P ,  KALTHOFF CLEMENT H ,  RUEGER WILLIAM J ,  THOMPSON TIMOTHY W

IPC: G06K13/24 ,  B65H19/28 ,  B65H51/28 ,  G11B15/66 ,  G11B15/67 ,  B65H17/32

CPC classification number: G11B15/671 ,  G11B15/66

Abstract: A wide magnetic tape is self-threaded about a helical path containing a rotating head by pushing a tape along the channelized helical path. Electronic control of the supply motor, take-up motor, channel pneumatics and tape edge guides optimizes the threading of the helical path for speed and reliability. The supply spool acts as the pushing force on the tape to push the tape through the channelized path. Motion of the tape, including speed and position, is controlled as a result of sensing the position of the end of tape as it proceeds through the thread path and attaches itself to the take-up hub. The take-up hub is a vacuum hub to assist the attachment of the tape to the hub. Motion control of the tape during thread includes selection of speeds for different portions of thread operation including stopping and reversing tape motion to assist attachment of tape to the take-up hub and straightening of tape along the helical path.