(19)
(11) EP 1 080 853 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.10.2002 Bulletin 2002/41

(43) Date of publication A2:
07.03.2001 Bulletin 2001/10

(21) Application number: 00307574.4

(22) Date of filing: 01.09.2000
(51) International Patent Classification (IPC)7: B26F 1/10
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 03.09.1999 US 152768 P
24.08.2000 US 645365

(71) Applicant: EMT International
Green Bay, Wisconsin 54302 (US)

(72) Inventor:
  • Rauscher, Paul
    De Pere, Wisconsin 54115 (US)

(74) Representative: Pearce, Anthony Richmond 
MARKS & CLERK, Alpha Tower, Suffolk Street Queensway
Birmingham B1 1TT
Birmingham B1 1TT (GB)

   


(54) Punch ring


(57) An improved punch ring (40) for a hole punching system used to punch lines of holes in a passing paper web. The ring (40) has a punch receiving portion (42). The punch receiving portion (42) includes a number of radially extending grooves (54) spaced about the circumference of the punch receiving portion (42) to receive hardened punches (56). The punch receiving portion (42) also includes a number of cylindrical bores (50) extending through the punch receiving portion (42) between adjacent pairs of the grooves (54) that each receive a clamp screw (52). A clamp ring (44) includes a number of threaded apertures (62) alignable with the bores (50) in the punch receiving portion (42). The clamp ring (44) is placed against the punches (56) in the grooves (54). Clamp screws (42) are inserted through the bores (50) to engage the threaded apertures (62) in the clamp ring (44) to hold the clamp ring (44) in engagement with the punch receiving portion (42) and retain the punches (56) in the grooves (54). The use of the clamp ring (44) avoids the problems heretofore encountered when screws are used to hold punches in a punch ring. Furthermore, the separate clamp ring (44) eliminates the need for the removal of the entire punch ring (40) and shaft from the system should the threads in the clamp ring (44) become damaged by the clamp screws (52).






Search report