Apparatus for converting holes in a stack of overlapping leaves

Details Apparatus for converting holes in a stack of overlapping leaves Apparatus for converting holes in a stack of overlapping leaves

1980-06-17

1983-09-13

Bell, Paul A.

Bookbinding: process and apparatus

Apparatus

Edge binding apparatus

270 53, B42B 508

Patent

active

044038968

ABSTRACT:
Apparatus for converting straight or inclined holes along one edge face of a stack of leaves into arcuate passages for convenient threading of the leader of a spiral wire binder has a locating device which holds the stack in a given position. Two rows of pivotable and retractible straight mandrels are adjacent to opposite sides of the stack in the locating means, and such mandrels are introduced into the registering holes of the stack prior to movement of the convex surface of a shaping member against the edge face of the stack. The convex surface shifts the leaves of the stack relative to each other and causes the leaves to pivot the mandrels to mutually inclined positions. At the same time, the leaves convert the holes into arcuate passages whose curvature conforms to that of the convex surface on the shaping member. The stack is thereupon clamped during withdrawal of mandrels from the arcuate passages.

REFERENCES:
patent: 4157821 (1979-06-01), Fabrig
patent: 4161196 (1979-07-01), Fabrig

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