Tape pack diameter measurement means and method
AssigneeAmpex Corporation
InventorsKenneth Louth, Reginald William Oldershaw
Life of this patent
Estimating the term…
Abstract
An unknown tape pack diameter is determined by measuring the inertia of the unknown tape pack and comparing the inertia with an inertia value representative of the inertia of a second tape pack of known diameter.
Claims11
A method of measuring the tape pack diameter of a reel of tape driven by a reel servomotor, comprising:
- measuring the inertia of a first tape pack, and
- comparing said inertia with an inertia value representative of the inertia of a second tape pack of known diameter to determine the diameter of said first tape pack.
A method of measuring an unknown tape pack diameter of a reel of tape driven by a reel servomotor, comprising:
- 1. applying a step voltage to said servomotor;
- 2. detecting the transient response of said servomotor to said applied step voltage;
- and
- 3. comparing said transient response with a reference transient response for a tape pack of known diameter to determine said unknown tape pack diameter.
A method of measuring an unknown tape pack diameter of a reel of tape driven by a reel servomotor, comprising:
- 1. removing a step voltage from said servomotor while said servomotor is in operation;
- 2. detecting the transient response of said servomotor to the removal of said step voltage;
- and
- 3. comparing said transient response with a reference transient response for a tape pack of known diameter to determine said unknown tape pack diameter.
A system for measuring the tape pack diameter of a reel of tape driven by a reel servomotor, comprising:
- means for measuring the inertia of a first tape pack;
- and
- comparison means for comparing said first tape pack inertia with an inertia value representative of the inertia of a second tape pack of known diameter to determine the diameter of said first tape pack.
Dependencies are inferred from the claim text.