US 3,941,372 AGranted

Feeding apparatus for corrugated cardboard sheets

OwnerMasaharu Matsuoinventor

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Abstract

Corrugated cardboard sheets are drawn individually from the bottom of a stack by two perforated, continuous belts downwardly bounding a receptacle space which is bounded in a forward direction by a gate. The front part of each belt under the receptacle space travels over a suction box while the rear part may be shifted between an operative position in which the front and rear parts are longitudinally aligned and an idling position in which the rear part is offset from the operative position downward and outward of the receptacle space. The suction box and the shifting mechanism for the rear part of the belt under the receptacle space are synchronously controlled in such a manner that the rear part of the belt is in the operative position while the suction box is being evacuated for maximum traction effect of the belt on the lowermost sheet in the stack, and the rear part is dropped into the idling position while the suction box is vented to the ambient atmosphere so that the belts slip under the stack, and successively fed corrugated sheets are spaced from each other and do not overlap.

Claims8

Dependent claims

Sheet feeding apparatus comprising:

a. a support;
b. gate means mounted on said support and bounding a receptacle space in a predetermined direction, said space being adapted to hold a stack of sheets;
c. a continuous, perforated, elongated belt;
d. guide means on said support guiding said belt in a closed, longitudinal loop,
1. said belt in a portion of said loop bounding said receptacle space transversely to said direction for supporting said stack and having a front part adjacent said gate means and a rear part remote from said gate means,
2. said guide means including shifting means for shifting said rear part back and forth between an operative position in which said rear part is aligned with said front part in the direction of elongation of said belt, and an idling position spaced from said operative position outward of said receptacle space,
e. drive means for continuously moving said belt in said loop in a direction from said rear part toward said front part;
f. suction means for drawing air from said receptacle space through the perforations of said front part;
and
g. control means operatively connected to said suction means and to said shifting means for operating the same in timed sequence, said suction means being actuated by said control means when said rear part is in said operative positions, and said perforations in said front part being vented to the atmosphere by said control means when said rear part is in said idling position.

7 more elements

Dependencies are inferred from the claim text.