Closed shoe press head indexing system

Details Closed shoe press head indexing system Closed shoe press head indexing system

D - Textiles, Paper

21

F

D21F 3/02 (2006.01)

Patent

CA 2211601

A blanket passes over a concave shoe which is urged against a backing roll to form a press nip. The ends of the blanket are attached to circular heads. The transition from the nip-imposed cardioid shaped to the circular shape maintained by the heads results in a region of the blanket subject to fatigue. The heads are mounted on journals for motion between inboard stops and outboard stops which are spaced apart approximately 4 inches in the cross machine direction. Positioning of the heads on the journals is controlled by four hydraulic pistons mounted between the support beam and each head. Multiple hydraulic systems are controlled to extend the life of the blanket by alternating between holding the back head fixed and letting the front head float and fixing the front head and letting the back head float.

Cette invention concerne une toile qui passe sur un sabot de formation concave pressé contre un contre-rouleau pour former une pince. Les extrémités de la toile sont fixées à des joues circulaires. La transition entre la forme cardioïde imposée par la pince à forme circulaire maintenue par les joues engendre une zone de fatigue de la toile. Les joues sont montées sur tourillons et sont mobiles entre des butées intérieurs et des butées extérieures espacées d'environ 4 pouces dans le sens travers à la machine. La position des joues sur les tourillons est réglée par des pistons hydrauliques montés entre la poutre support et les joues. Des circuits hydrauliques multiples interviennent pour allonger la durée utile de la toile en immobilisant la joue arrière tout en laissant la joue avant flotter et vice versa.

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