US 4,693,433 AGranted

Unwind stand for web rolls

OwnerMerrill D. Martininventor

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Abstract

An unwind stand for positioning and controlling the unwinding of large paper rolls to processing machines is mounted on wheels riding on rails and motor driven through hydraulic motor to providing gripping and longitudinal movement of the rolls. Swinging gripping arms are mounted on the stand and disposed to grip the ends of the roll and raise it above the floor and hold it in position and provides for unwinding. The arms are capable of longitudinal movement along the axis of the roll, either individually or simultaneously, for flexibility in picking up the roll and locating it into operating position. A device is provided for final axial adjustment in alignment with the processing machine in a transverse direction and a device for gripping the rails to hold the machine in a fixed position and to prevent its tipping over. The entire stand and all its functioning elements is operated from a platform located on a cab in which are positioned various control elements for operation of the hydraulic components of the stand.

An unwind roll stand for handling paper rolls on a spool for supplying a web of paper to a processing machine comprising:

a travelling carriage;
a control cab forming a part of said carriage;
a pair of parallel swing lift arms positioned on movable bases;
said arms being pivoted on and keyed to a rotating shaft to insure their alignment with each other;
one end of said shaft being journaled on said carriage and the other end on an outboard support;
hydraulic means for raising and lowering said lift arms comprising:
hydraulic cylinders pivotally mounted on said arms;
piston rods one end engaging pistons within said cylinders and the opposite end pivotally mounted on said bases to exert a thrust thereon;
hydraulic means to operate said pistons to produce a reciprocating motion;
a pair of parallel steel rails positioned longitudinally beneath said roll stand;
said bases being mounted on wheels engaging said rails;
said carriage being mounted on an axle carrying flanged wheels engaging said rails;
means for moving said bases and said arms simultaneously in a longitudinal direction along said rails independently of said carriage;
means for moving each of said bases and said arms separately in a longitudinal direction along said rails independently of said carriage to accommodate said rolls therebetween;
said means for moving said bases and said arms in a longitudinal direction comprising:
a pair of rotating screws;
hydraulic motors coupled to one end of each of said screws;
said motors being mounted on collars positioned on said carriage;
the opposite end of said screws being journaled into said outboard support;
travelling nuts disposed for engaging said screws;
said nuts being fixedly positioned on said bases;
hydraulic means for turning each of said motors separately;
hydraulic means for turning both of said motors simultaneously;
spindles positioned at the outer ends of the facing sides of said arms and having adjustable brakes mounted thereon;
pointed chuck means positioned on said spindles and disposed to engage axially the ends of said spool in said rolls at their centers and thereby grip them in position;
means for driving said axle and flanged wheels on said carriage and moving it longitudinally along said rails;
means for controlling the movement of said bases, said arms and said carriages positioned in said control cab.

24 more elements

Abstract

Claims7