Stacking method and apparatus

Details Stacking method and apparatus Stacking method and apparatus

B - Operations, Transporting

65

H

270/53

B65H 31/30 (2006.01) B65H 7/20 (2006.01) B65H 29/12 (2006.01) B65H 29/70 (2006.01) B65H 33/08 (2006.01) B65H 33/16 (2006.01) B65H 43/00 (2006.01)

Patent

CA 1306474

ABSTRACT OF THE DISCLOSURE A self-adaptive stacker comprised of infeed and stacking sections whose movement is coordinated to provide interception of the signature stream. The infeed conveyor section "Vees" the in- coming signature stream through the use of rollers of different diameters mounted upon straight, spaced, parallel shafts. A microprocessor utilizes a signal, representative of the infeed conveyor speed, together with a signal from a signature counter, to track the movement of each signature and thereby its arrival at the intercept position. Low armature inertia motors drive the three axes, (stacking section, the turntable, and the ejectors) to provide rapid starting, acceleration, deceleration, and stopping at selected positions. These motor are controlled to interact in real-time in order to adapt the three axes to the rate of the incoming signatures. The movement of the signature carriers is altered, when necessary, due to speed changes of the signature stream. A sensor located at the intercept ready posi- tion detects the passage of a signature carrier to initiate acceleration of the signature carrier by an amount which is a function principally of signature thickness, velocity and separa- tion distance to control the amount of acceleration required to move the carrier beneath the first signature of the next stack to be formed. The load current of the stacker motor is monitored to detect the occurrence of a jam which condition is prevented from damaging the stacker section conveying assembly by halting and -20-

538072

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