A reel-to-reel web (tape) transport apparatus which has no tape length buffering between the supply and take-up reels. The tape follows a fixed length path from the supply reel, past a read/write head and guides, to a take-up reel. A two motor control mechanism is employed in which one motor drives the take-up reel and one motor drives the supply reel to maintain the appropriate tension and tape motion at the read/write head. The control mechanism is adaptive to dynamic changes as the tape is moved from the supply reel to the take-up reel. Three quantities are monitored: lineal tape position and the angular reel displacement of the supply and take-up reel. From these quantities reel radii are derived, tape inertia calculated and the velocity or position error is determined. A motor current algorithm is utilized to generate the appropriate torque for each reel to drive the control error to zero along a predetermined profile with negligible tape tension disturbances. The result is a reel-to-reel tape drive with static and dynamic performance characteristics which are independent of reel radius and inertia changes resulting from tape motion.

Adaptive reel-to-reel tape control system

A method for controlling the transfer of a flexible web member from a supply reel to a take-up reel, according to which the rotational speeds of the supply reel and the take-up reel are measured and whereby the ratio between these measurements is established independently of the speed and direction of the movement of the web member. The method comprises the steps of storing reference information representing the characteristics of different types of reel and web, releasing the reference information corresponding to the reels and webs used, generating intermediate signals which represent the said ratio combining these intermediate signals with the released reference information and generating output signals in dependence upon the momentary position of the web in relation to one or other ends thereof, and using these output signals for the purpose of visually displaying the position of the web and/or of controlling certain operations of the apparatus. Apparatus is also disclosed comprising angular speed detectors for measuring the rotational speed of each of the reels, and a micro-processor having two counters totalizing the pulse signals generated by the speed detectors and a divider circuit for generating, on receiving a control signal, intermediate signal representing the ratio between the contents of the counters, a memory containing reference information relating to different types of reels and web, and a circuit for combining the intermediate signals with the stored information corresponding to the reels and web used and generating output signals in dependence upon the instantaneous position of the web in relation to one or other of its ends. The output signals are applied to a display device serving to indicate the position of the web member.

Transfer of a flexible web member from supply reel to a take-up reel

A method of controlling the internal tension of a web roll, in particular a paper web roll during winding of the roll in a winder having two, individually driven supporting rollers. The rotational speeds of the supporting rollers or their drive members are measured, whereby the speed signals are fed to control means for controlling the rotational speeds of the supporting rollers to maintain a desired speed difference therebetween for controlling the web tension wound into the roll.

Method of controlling a web winding process

An optical encoder generates a train of digital pulses as a function of the length of web material unwound per revolution of an unwinding roll. A counter counts the encoder pulses for each revolution of the roll. The counts of the encoder pulses are accumulated over a first set of revolutions of the roll. A programmed microprocessor effects a base computation of (1) the average change in the number of pulses generated per revolution of the roll and (2) the length of web remaining on the roll after the first set of revolutions. Thereafter, the base computation of web length is updated at each revolution of the roll. The counter may comprise an addressable hardware counter chain alone or in combination with a read/write memory which counts the number of times that the counter chain overflows.

Control system for an unwinding roll

Coil Diameter Control System for controlling strip coiling apparatus whereby rotation of the coiling mandrel is automatically and precisely terminated upon the attainment of a preselected coil diameter wound about the mandrel. The invention can be utilized to precisely terminate mandrel rotation both when the mandrel is operating in a coil build-up mode or when it is functioning as a pay-off device in an uncoiling operation.

Coil diameter control system

An end of tape sensor for sensing the approaching end of a supply of magnetic tape on a storage reel on a tape transport and for producing a control signal for controlling the tape drive means includes a feed tachometer means for detecting longitudinal tape speed, reel tachometer means for detecting reel rotational speed, digital counter means responsive to said feed and reel tachometer means for developing a digital signal representing the ratio of longitudinal tape speed to reel rotational speed, a tape pack diameter selector for producing a preselected digital ratio of longitudinal tape speed to reel rotational speed corresponding to a desired terminal tape pack diameter and digital comparator means for comparing said digital signal with said preselected digital ratio, said comparator including a storage register which produces a control signal to control said tape drive means when said digital signal and said preselected digital ratio achieve a plurality of matches in succession.

Apparatus and method for sensing diameter of tape pack on storage reel

Anordnung zur feststellung der auf einer drehbaren speicherspule vorhandenen menge eines langgestreckten bandes

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Apparatus and method for sensing diameter of tape pack on storage reel

Anordnung zur feststellung der auf einer drehbaren speicherspule vorhandenen menge eines langgestreckten bandes