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High Speed Shuttle Mechanism and Control

IP.com Disclosure Number: IPCOM000037121D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 3 page(s) / 70K

Publishing Venue

IBM

Related People

Arai, A: AUTHOR [+2]

Abstract

Disclosed is a new mechanism and control for high speed and long stroke shuttle motion. A trapezoidal velocity curve is realized by adopting a simple gain scheduling and a learning function which reduces mechanical friction variation by machine or shuttle direction. In addition to this, the ratio of head weight to rotary inertia induces preferable shuttle motion. With these techniques, power consumption can be greatly minimized in a high speed shuttle motion and an acceptable size can be achieved. (Image Omitted) Mechanism

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High Speed Shuttle Mechanism and Control

Disclosed is a new mechanism and control for high speed and long stroke shuttle motion. A trapezoidal velocity curve is realized by adopting a simple gain scheduling and a learning function which reduces mechanical friction variation by machine or shuttle direction. In addition to this, the ratio of head weight to rotary inertia induces preferable shuttle motion. With these techniques, power consumption can be greatly minimized in a high speed shuttle motion and an acceptable size can be achieved.

(Image Omitted)

Mechanism

A crank mechanism, generally used in an automobile, is adopted to a high speed shuttle printer with modification. In Fig. 1 the print head moves right and left when the crank shaft turns. Then, the inertia energy of the print head is effectively used for acceleration. In the new shuttle mechanism, a decrease in the moment of inertia is effective to drive a print head to move at constant velocity in the printing area. In the Fig. 2 model, an equation of the new mechanism is given as: ( J + Mr2 sin2 r ) r + ( Mr2 sinr cosr ) r2 - rF3 = 0

Assuming the force from outside F3 is zero, the equation can be written as: ( J/Mr2 + sin2 r ) r + (sin2 r ) r2 /2 = O (Initial conditions: r = O, r = O).

In the above form, parameter J/Mr is variable. The simulated shuttle motion curve, when the ratio is adjusted to J:Mr = 1:8, nearly shows the required shuttle curve in Fig. 3.

Servo Control: By an incremental encoder provided in the head assembly, the position and speed of the head can be fed back to a...