(19)
(11) EP 0 655 302 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.12.1996 Bulletin 1996/52

(43) Date of publication A2:
31.05.1995 Bulletin 1995/22

(21) Application number: 95200073.5

(22) Date of filing: 02.01.1990
(51) International Patent Classification (IPC)6: B26D 1/24, B26D 5/04, B26D 7/26
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 03.01.1989 US 293298

(62) Application number of the earlier application in accordance with Art. 76 EPC:
90300001.6 / 0377484

(71) Applicant: TIDLAND CORPORATION
Camas Washington 98686 (US)

(72) Inventors:
  • Tidland, John W.
    Vancouver, Washington 98686 (US)
  • Biswas, Borendra K.
    Vancouver, Washington 98664 (US)
  • Schable, Reinhold A.
    Washougal, Washington 98671 (US)
  • Miller, William R.
    Portland, Oregon 97219 (US)
  • VanderBom, Casey M.
    Willsboro, Oregon 97124 (US)

(74) Representative: Parker, Nigel Edward et al
H.N. & W.S. Skerrett Charles House 148/9 Great Charles Street
Birmingham B3 3HT
Birmingham B3 3HT (GB)

 
Remarks:
This application was filed on 13 - 01 - 1995 as a divisional application to the application mentioned under INID code 60.
 


(54) Web slitting machine


(57) A web slitting machine (10) for cutting a web or roll of material includes an upper carriage assembly (16) joined to a lower blade holder assembly (18) by a selectively removable guide key (38) which is milled to provide a predetermined cant angle for the blade (20). The blade (20) is lowered into position by a piston (54, 58) which is rectangular and includes a torsion-resisting sleeve (60a, 60b) to prevent rotation of the piston about its vertical axis. A pneumatic control provides a plurality of control modes whereby the blade (20) may be raised and lowered with or without locking the upper carriage assembly (16) to its transverse bar (14) and vice-versa. A unique side shift adjustment is provided whereby the blade (20) may be shifted to a half-stroke position and the upper carriage (16) locked when the blade is positioned against a lower knife (22). This ensures that the pressure of the blade (20) against the knife (22) is the pressure exerted at the mid point of the stroke. A parallelogram linkage (210, 212) biased by a spring (224) can provide a shock absorber for maintaining blade/knife contact in the presence of webs moving at high speed.






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