| 摘要 |
A friction wheel singler is proposed for singling sheet material, in particular bank notes, comprising sheet magazine 5 for receiving stack of sheets 1, singling cylinder 2 having one or more friction elements 4 for contacting and conveying sheet 1a to be singled out of the magazine, and retaining device 3 forming with singling cylinder 2 singling gap 7 through which sheets 1a to be singled out of the magazine are conveyed one by one, retaining device 3 having one or more friction areas 3a for contacting sheets 1a to be singled out of magazine 5. Friction elements 4 of singling cylinder 2 and friction areas 3a of retaining element 3 have the same friction material, whereby different frictional forces transferred to sheet 1a by singling cylinder 2, on the one hand, and retaining device 3, on the other hand, are obtained by selecting the contact area between friction elements 4 of singling cylinder 2 and sheet 1a to be singled to be substantially larger than the contact area between friction areas 3a of retaining element 3 and sheet 1a to be singled. Any further contact areas of retaining device 3 and/or singling cylinder 2 with the sheet to be singled have a substantially lower coefficient of friction than the friction material of friction elements 4 of singling cylinder 2 and friction areas 3a of retaining element 3. According to a special aspect of the invention, it is proposed that the sheet material is deposited in sheet magazine 5 on driven feed rolls 11 to 14 to guarantee a reliable supply of sheets to be singled to singling gap 7 regardless of the stack height.
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