| 摘要 |
828,588. Microtomes. LEITZ G.m.b.H., E. April 23, 1958 [May 25, 1957], No. 12855/58. Class 97(1) The microtome comprises two driving means for providing relative movement at two different speeds between an object to be sectioned and a knife, means being provided for alternately coupling each of the driving means to a rotor for carrying a knife or an object so that the relative speed of the object and knife is higher in the intervals between the cutting actions than it is during them. In the Figure the object 2a is moved past a knife 7 by a rotor 1. The rotor 1 is belt driven from a shaft 10 which may be connected through the electromagnetic clutch 16 to electric motor 18 and which is connected through an overrun clutch to motor 14. This motor 14 has a slower speed than motor 18 and runs idle, when the motor 18 is driving the rotor. As the object 2a approaches the knife 7, a cam 6 on rotor 1 opens a switch 19 and the motor 18 is disconnected so that as the object passes the knife it is driven by the motor 14 only. After the cut has been reformed switch 19 re-opens and rotor 1 is again driven at a higher speed by motor 18. Motor 18 may be permanently connected to the rotor by closing switch 20. Only one motor, connected to clutches 16 and 12 by intermediate gearing need be used. |
