| 摘要 |
583,594. Feeding sheets. DEHN, F. B. (Christensen Machine Co.). Nov. 7, 1944, No. 21858. [Class 100 (i)] A side-registering device for sheet feeders of the kind in which the sheets are registered against side guides 11 by feed rollers which grip the sheet intermittently while in contact with the front lays is constructed with two sets of gripping rollers 12<1>, 12<11> : 13<1>, 13<11>, mounted in oscillating arms 20, and so constructed that when the sheet is gripped by the rollers 13, 131 close to the side guide the arms 20 are raised so as to free the sheet of the grip of the rollers 121, 12". This ensures that any marring of the sheet, due to slippage of the rollers while in contact with the side guide, is outside the printing area, and so does not spoil the prints. The sligbt rise given to roller 12<11> when roller 13<11> engages the sheet is shown in Fig. 6. The lower rollers 12<1>, 13<1>, are positively driven, and roller 13<1> is preferably driven more slowly than roller 12<1>. The rollers act through slots in a feed table 6, and crinkling of the sheets is prevented by a shoe 27 carried by the arms 20, and formed with slots through which the rollers 12<11>, 13<11> project. In a modification, Fig. 9, the shoe 27 is replaced by a shoe 30 which has a lost motion connection (rod 34 and aperture 35) with the arms 20, and when the rollers 12<1>, 12<11> are in engagement the shoe is maintained by gravity in a position which is controlled by engagement of a screw 32, Fig. 10, not shown, with a fixed part of the frame. |
