公开(公告)号：US5367471A

公开(公告)日：1994-11-22

申请号：US919151

申请日：1992-07-23

申请人： Thai Nguyen ,  George Reichenberg

发明人： Thai Nguyen ,  George Reichenberg

IPC分类号： G11B15/43 ,  G11B15/48 ,  B65H59/38

CPC分类号： G11B15/48 ,  G11B15/43

摘要： A method and apparatus is disclosed which reduces tape stiction during tape acceleration and deceleration. Tape tension is adjusted to eliminate the effects of tape stiction when the tape is either accelerated from a stationary position to a steady state velocity, or decelerated from a steady state velocity to a stationary position. This method uses tape tension, tape velocity, and tension reference profiles stored in a microprocessor to dynamically adjust the tape tension during tape acceleration and deceleration. The tape tension is adjusted as a function of tape velocity by the use of both a current generated by the tension reference profile and a feedforward current. The feedforward current is determined by the sum of the tape velocity and tape tension profiles. This dynamic adjustment of tape tension essentially eliminates tape stiction in tape start and stop operations. The tape drive system can therefore function more error-free and more efficiently with tape drive systems which use constant tape head air pressure.

摘要翻译： 公开了一种方法和装置，其减少了带加速和减速期间的磁带粘滞。 当磁带从静止位置加速到稳定状态速度或者从稳定状态速度减速到静止位置时，调整磁带张力以消除胶带静摩擦的影响。 该方法使用存储在微处理器中的磁带张力，磁带速度和张力参考曲线来在磁带加速和减速期间动态地调节磁带张力。 通过使用由张力参考曲线产生的电流和前馈电流来调节带张力作为带速度的函数。 前馈电流由磁带速度和磁带张力分布的总和决定。 磁带张力的这种动态调整基本上消除了磁带启动和停止操作中的磁带粘滞。 因此，磁带驱动系统可以使用磁带头空气压力恒定的磁带驱动系统，无故障地运行。

公开(公告)号：US5058822A

公开(公告)日：1991-10-22

申请号：US573079

申请日：1990-08-24

申请人： Thai Nguyen ,  George Reichenberg

发明人： Thai Nguyen ,  George Reichenberg

IPC分类号： G11B15/08 ,  G11B15/67

CPC分类号： G11B15/08 ,  G11B15/67

摘要： The takeup reel positioning apparatus for the tape threading operation in a magnetic tape drive functions to precisely locate the takeup reel slot at the end of the tape threading path in order to enable the tape threading arm to load the leader block therein. This precise positioning is accomplished by the use of a disk that is fixedly attached to the takeup reel motor shaft. An interrupter is provided whose beam transverses the disk in the region of an annular ring thereon thereby indicating the presence of a transparent or opaque portion thereof. A selected boundary between the opaque and transparent portions of the annular ring is in the path of the beam of the interrupter at precisely the same time that the takeup reel slot is positioned at the end of the tape threading path. The interrupter is used to cause the takeup reel motor to oscillate around this predetermined position to automatically compensate for any mispositioning caused by inaccuracies in the appartus.

摘要翻译： 用于磁带驱动器中的磁带穿线操作的收带卷轴定位装置用于在带穿线路径的端部处精确地定位卷绕卷轴槽，以使带穿线臂能够将导引块装入其中。 这种精确的定位是通过使用固定地连接到卷绕电动机轴的盘来实现的。 提供了一个断路器，其横梁在其上的环形区域中横跨盘，从而指示其存在透明或不透明部分。 在环形环的不透明部分和透明部分之间选择的边界处于与断线器的梁的路径中的准确相同的时间，即卷绕卷轴槽位于带穿线路径的端部。 断路器用于使卷绕马达在该预定位置周围振荡，以自动补偿由于不准确引起的任何误位。