(19)

(11)

EP 0 577 638 A1

(12)

(43) Date of publication: 12.01.1994 Bulletin 1994/02 (21) Application number: 92906641.0 (22) Date of filing: 17.03.1992

(51) International Patent Classification (IPC):  D03C 3/ 20( . ) (86) International application number: PCT/GB1992/000471 (87) International publication number: WO 1992/016680 (01.10.1992 Gazette 1992/25)

(84) Designated Contracting States: GB (30) Priority: 21.03.1991 GB 19910006058 19.09.1991 GB 19910019996 (71) Applicant: BONAS MACHINE COMPANY LIMITED Gateshead ME11 OLF (GB)	(72) Inventors: LOGAN, John Light Horne, Warwickshire CV35 OAX (GB) SANGHA, Parminder Singh Solihull, West Midlands B91 1UF (GB) (74) Representative: Dealtry, Brian, et al  Eric Potter & Clarkson St. Mary's Court St. Mary's Gate Nottingham NG1 1LE Nottingham NG1 1LE (GB)