Magnetic tape transport device with tape tension roller on a lever subjected to motor torque
AssigneeBTS Broadcast Television Systems GmbH
InventorsGerhard Falk, Wolfgang Fell
Life of this patent
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Abstract
In a magnetic tape transport device having supply and take-up reels and tape guide elements, as well as a scanner, there is engaged with the tape on each side of the scanner a tape tension roller on the free extremity of a tape tension lever which is subjected to torque at its pivot by a d.c. motor for maintaining the desired tension of the tape. An angular position indicator is connected to the pivot of the lever and a regulation loop is provided for controlling the tape tension in a manner consistent with the tape speed. A capstan drive of the tape is not necessary.
Claims8
A magnetic tape transport device having
- two reel devices for winding up and unwinding a magnetic tape,
- tape guide elements,
- a scanner for scanning the tape,
- a first tape tension roller mounted on a first swingable tape tension lever, said lever being mounted so as to be swingable about a first axis,
- a first motor for controlling tape tension having a shaft which is affixed directly to said first lever for swinging said lever about said first axis,
- a second tape tension roller mounted on a second swingable tape tension lever, said lever being mounted so as to be swingable about a second axis,
- a second motor for controlling tape tension having a shaft which is affixed directly to said second lever for swinging said lever about said second axis, wherein:
- said first tape tension roller, and said first motor are coupled to said first lever, being component parts of a first tape tension device, and said second tape tension roller and said second motor are coupled to said second lever, being component parts of a second tape tension device;
- said first tape tension device is located for engagement of said first tape tension roller with said tape on the path of said tape between said scanner and a first one of said two reel devices operating as a supply reel and said second tape tension device is located for engagement of said second tape tension roller with said tape on the path of said tape between said scanner and a second one of said two reel devices operating as a take-up reel;
- said first tape tension lever is connected with an angular position indicator for producing an electrical angular position signal;
- a regulating circuit is provided for detecting deviation (.delta.v) of the tape speed (v.sub.act) from a value corresponding to the sum of a reference tape speed value (v.sub.r) and a tape tension reference value (F) derived from said tape speed and providing, in response to said deviation (.delta.v), a controlling direct current for said first motor for controlling tape tension;
- each of said reel devices is equipped with a reel drive motor connected to a reel device regulator for controllably driving a reel of said reel device, and
- said output signal of said angular position indicator is a control magnitude for the corresponding reel drive regulator.
Dependencies are inferred from the claim text.