Apparatus for severing and deforming the ends of helical binders

Details Apparatus for severing and deforming the ends of helical binders Apparatus for severing and deforming the ends of helical binders

1979-03-20

1981-03-03

Larson, Lowell A.

Wireworking

Article making or forming

Helix screwing through row of loops or openings

B21F 3502

Patent

active

042534992

ABSTRACT:
Apparatus for looping the free end portions of the outermost convolutions of helical binders which are threaded through the perforations of a stack of loose leaves has a pivotable tool with a cutting edge which clips the end convolution of a properly located binder and a bending edge which bends the free end portion of the clipped end convolution over the neighboring convolution. A rotary loop forming device is thereupon actuated by a lever to convert the deformed end portion into a loop which surrounds the neighboring convolution. The loop forming device has a guide face which cooperates with a parallel second guide face provided on a reciprocable hold-down device which is caused to extend between the end convolution and the neighboring convolution while the end portion is converted into a loop. These guide faces cooperate with a guide face of a locating projection for the binder and with a guide face of the tool to define a channel which confines the end portion during loop forming so that the loop is located in a plane which includes the axis of the binder. The hold-down device has a notch which receives and prevents deformation of the remaining part of the outermost convolution while the free end portion is being looped around the neighboring convolution.

REFERENCES:
patent: 2649120 (1953-08-01), November
patent: 3568729 (1971-03-01), Freundlich
patent: 3972109 (1976-08-01), Sickinger
patent: 4095623 (1978-06-01), Lemburg et al.

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