(57) The invention provides a load equalising device for engraved rollers and doctor blades
for use in a spreading machine for spreading or printing, the spreading machine being
preferably suitable for use in the tanning and textile industries for depositing covering
products such as pigments, resins, glues and the like on hide fabric or other types
of stock,
- the spreading machine comprising a transport mechanism for the stock and a distribution
assembly for the coating product to be deposited on the surface of the stock,
- the spreading machine preferably having a roller guide unit or doctor blade guide
unit (1) mounted on a movable bridge (2), connected by a bolt (3) to the fixed structure
of the machine and provided with a spider (4) which positions in sequence one of the
engraved rollers (5) or doctor blades to face the belt (6) carrying the stock to be
treated;
- the load equalising device being characterised in that it is constructed such that
when the roller (5') or the blade (15) is positioned in the work area, in such a manner
as to face the impression roller or the carrier belt, the roller (5') or the blade
(15) while being attached to the spider is held by two lateral spring supports (7),
the two lateral spring supports (7) being adjustable to equalise the load exerted
on the engraved roller or doctor blade in operation as a consequence of its weight,
or the weight of the support structure or other components present on the bridge,
and to equalise variations in the width of the gap at a restricted zone (10) caused
by variations in thickness of the stock or by elastic yield of the components of the
machine, thereby to maintain the contact pressure exerted by the roller or blade on
the stock to be treated at a substantially constant and pre-set value.
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