A core pipe for a sheet roll

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(11)

EP 1 052 211 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	11.04.2001 Bulletin 2001/15

(43)	Date of publication A2:
	15.11.2000 Bulletin 2000/46

(21)	Application number: 00116709.7

(22)	Date of filing: 08.09.1997

(51)	International Patent Classification (IPC)⁷: B65H 75/10, B65H 75/18

(84)	Designated Contracting States:
	BE DE DK ES FR GB GR IE IT NL PT

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Priority:

20.09.1996 JP 25049296

(62)	Application number of the earlier application in accordance with Art. 76 EPC:
	97115567.6 / 0831048

(71)	Applicant: Kabushiki Kaisha Yuyama Seisakusho
	Toyonaka-shi, Osaka (JP)

(72)	Inventors:
	Yuyama, Shoji, K. K. Yuyama Seisakusho Toyonaka-shi, Osaka (JP) Nose, Hiroshi, K. K. Yuyama Seisakusho Toyonaka-shi, Osaka (JP) Yasunaga, Itsuo, K. K. Yuyama Seisakusho Toyonaka-shi, Osaka (JP) Etou, Naomichi, K. K. Yuyama Seisakusho Toyonaka-shi, Osaka (JP) Amano, Hirokazu, K. K. Yuyama Seisakusho Toyonaka-shi, Osaka (JP)

(74)	Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät
	Maximilianstrasse 58 80538 München 80538 München (DE)

(54)	A core pipe for a sheet roll

(57) It is desired to prevent misalignment of the edges of a folded sheet by smoothly feeding the sheet while keeping tension fluctuations to a minimum when the sheet is unwound from a paper roll (R) set in a paper feed unit to a packaging unit even though the paper roll diameter decreases gradually as the sheet is unwound. A core pipe (P) for a sheet roll is provided comprising a hollow core pipe having a predetermined length for winding a sheet therearound, and magnets (24) provided on the inner periphery of said hollow core pipe near one end thereof at angular intervals determined such that the amount and diameter of the sheet roll wound therearound can be calculated by an angle sensor (25) provided on a fixed shaft (1b), said hollow core pipe being rotatable together with a hollow shaft (1c) rotatably mounted around said fixed shaft. Accordingly, the sheet tension is adjusted to an optimum, constant level by controlling the sheet braking force stepwise according to the roll diameter measured by the sensors.

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