公开(公告)号：US3910527A

公开(公告)日：1975-10-07

申请号：US44957774

申请日：1974-03-08

Applicant: IBM

Inventor： BUHLER OTTO R ,  CUTTER JOSEPH T ,  MANTEY JOHN P ,  WOOD DAVID R

IPC: G03B21/43 ,  G11B15/32 ,  B65H59/38 ,  G03B1/04

CPC classification number: G11B15/32 ,  G03B21/43

Abstract: The parameters, i.e., acceleration/deceleration, speed, position and tension, of a length of unbuffered magnetic recording tape, which runs between the two reels of a reel-to-reel tape transport, are accurately controlled by a closed-loop servomechanism which is controlled as a function of the tape distribution between the two reels. A number of design-point servo networks are constructed and arranged to energize the reel motors, based upon the assumption that given tape distributions exist. The outputs of these point servo networks are weighted or blended by a network which is controlled in accordance with actual tape distribution. The output of the weighting network is then used to control reel motor energization.

Abstract translation: 通过一个闭环伺服机构精确地控制在卷轴到卷轴带传输的两个卷轴之间运行的无缓冲磁记录带长度的加速/减速，速度，位置和张力的参数， 作为两个卷轴之间的带分布的函数被控制。 基于存在给定的磁带分布的假设，构造并布置了许多设计点伺服网络以对卷轴电机通电。 这些点伺服网络的输出由根据实际磁带分布控制的网络进行加权或混合。 然后，加权网络的输出用于控制卷轴电机通电。

公开(公告)号：CA1098596A

公开(公告)日：1981-03-31

申请号：CA255843

申请日：1976-06-28

Applicant: IBM

Inventor： BUHLER OTTO R

IPC: H02H3/28 ,  H02H7/20

Abstract: A detection device for sensing malfunctions in a wide band power amplifier driving the take-up spool motor of a reel-to-reel tape transport system, is disclosed A feedback loop is connected from the output of the amplifier to a malfunction junction positioned at the input of the amplifier. The signal at the malfunction junction is monitored and compared with a predetermined range of standard reference signal. Whenever the malfunction junction signal is out of the predetermined range, the power amplifier is turned off thereby preventing damage to the tape. A filter means is positioned so as to desensitize the compare means until the amplifier is operating at steady state.