Device for applying thread staples to folded sheets

Details Device for applying thread staples to folded sheets Device for applying thread staples to folded sheets

1979-09-13

1981-10-13

Feldbaum, Ronald

Sewing

Special machines

Book sewing

42B 200, B42B 102

Patent

active

042941822

ABSTRACT:
The device for piercing thread staples into folded sheets travelling in a plane includes an endless chain travelling at the same speed above the sheet feeding plane and supporting at regular intervals thread feeding plates which in turn support for a reciprocating movement a needle carrier with two needles having bifurcated points for engaging a thread length in the plate. The needle carrier supports two cam following rollers cooperating, respectively, with a stationary cam assembly above the chain. The cam assembly includes a lower cam for imparting a lifting movement to the needle carrier and a pivotable upper cam for imparting a lowering movement to the carrier against the sheet to be stitched. The upper cam cooperates with a solenoid which urges the same into its working position, and with a tensioning spring which urges the cam into its inoperative position against the force of the solenoid. A switch deactivates the solenoid when the upper cam is displaced by the resistance of the needles toward its inoperative position.

REFERENCES:
patent: 3763798 (1973-10-01), Bottcher
patent: 3763799 (1973-10-01), Bottcher
patent: 4041883 (1977-08-01), Meratti

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