Fabrication of screen devices

Details Fabrication of screen devices Fabrication of screen devices

1978-12-22

1980-12-16

Larson, Lowell A.

Metal working

Method of mechanical manufacture

Repairing

425185, 210387, 210390, B29F 300

Patent

active

042388775

ABSTRACT:
Screen devices for use with an automatic screen changer (10) of an extruder (11) are fabricated from a screen preform (32) including an elongated carrier strip (36) having a plurality of screen elements (33--33) connected thereto. The screen changer (10) includes a pair of recesses (21,22) for receiving screen devices and is movable between a first position in which one recess is in the path of the extrudate (11) while the other recess is outside the path thereof and a second position in which the dispositions of the recesses is reversed. While a recess (21 or 22) is outside of the path of the extrudate, a used, clogged screen device is ejected therefrom and a new screen device is fabricated, in situ, therein. The screen device is fabricated by feeding the preform (32) between a punch (54) and the recess. The punch (54) is then actuated to sever an element (33) from the preform (32) and in the same motion insert it into the recess.

REFERENCES:
patent: 2661497 (1953-12-01), Birmingham
patent: 3007199 (1961-11-01), Curtis
patent: 3059276 (1962-10-01), Yokana
patent: 3661188 (1972-05-01), Gaug
patent: 3804758 (1974-04-01), Cooper et al.
patent: 3856277 (1974-12-01), Tiramani
patent: 3971721 (1976-07-01), Fogarty, Jr.
patent: 4021346 (1977-05-01), Berthiaume
patent: 4080297 (1978-03-01), Yoshida
patent: 4082487 (1978-04-01), Rapp

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