公开(公告)号：US3598966A

公开(公告)日：1971-08-10

申请号：US3598966D

申请日：1968-06-27

申请人： NCR CO

发明人： COMBS JERRY A ,  FECHER JOHN W

IPC分类号： G06K7/016 ,  G06K7/10

CPC分类号： G06K7/0163

摘要： Means for preventing an undetected loss of data from tape being sensed by a tape-sensing device, which loss may occur when a sprocket hole being used for clocking purposes is obstructed or defective so that a clock signal cannot be generated therefrom. The addition of a sprocket-hole-sensing device and electrical circuitry for generation of an error signal in response to failure to sense the sprocket hole enables a check to be made in advance as to whether or not the sprocket hole of a frame of data to be subsequently sensed is unobstructed. If a satisfactory signal is obtained from sensing of the sprocket hole, then sensing of the tape by the tape-sensing device proceeds normally. However, if the sprocket hole in question is obstructed or defective, then the normal sensing signal is not produced by the added sprocket-hole-sensing device, and an error signal is generated.

公开(公告)号：US3353007A

公开(公告)日：1967-11-14

申请号：US28005863

申请日：1963-05-13

申请人： NCR CO

发明人： COMBS JERRY A

IPC分类号： G11B15/44

CPC分类号： G11B15/444 ,  G11B15/448

摘要： 1,008,054. Record carrier feed. NATIONAL CASH REGISTER CO. April 17, 1964 [May 13, 1963], No. 15943/64. Heading G5R. A record carrier feeding system moves the record carrier in either direction past a transducer in response to forward or reverse control signals applied at F or B respectively, a bistable arrangement 50 stores the previous control signal and if a control signal is the same as the previous control signal -it is passed through AND gates 44 or 42 to the forward or reverse drives without delay, but if it is opposite to the previous control signal it is delayed until the bi-stable arrangement 50 has been switched, and switching of the bi-stable arrangement is delayed by a monostable arrangement 24. In this way abrupt reversal, with consequent damage, is avoided.