Patent GB-628856-A (GB)
Title: An improved device for automatically generating periodic motions, such as meandering, sinuous or zig-zag motions, of apparatus parts, particularly for the preparation-carriers of microscopes
IPC: G02B21/26
Filed: 1947-03-13
Abstract: 628,856. Microscopes. KRASSILNIKIAN, S., and HELLER, B. March 13, 1947. No. 7057. Convention date, March 13, 1946. [Class 97 (i)] [Also in Group XXIV] A microscope preparation carrier is supported on a slide linearly movable on a casing which itself is linearly movable along a fixed slide perpendicular to the first and gearing is provided such that continuous rotation of a control knob in one direction causes the preparation carrier to execute a continuous sinuous or zig-zag movement beneath the microscope objective ; means are also provided for effecting independent movements of the slide or casing. As shown in Fig. 1 the preparation-carrier G is on a slide 3 movable in guides 2b, Fig. 2, of a casing 2 which is similarly supported for perpendicular movement along a fixed guide 1. The slide 3 has a rack engaged by gear 13 connected by gears 12, 11 and 15 to a gear 10, and the carrier has gears 6, 8 engaging a rack on the fixed slide 1. A driving knob 21, Fig. 2, on a shaft 5 has three toothed wheels 51, 52, 53 integral therewith, the wheels 51, and 53 respectively having teeth over two portions and one portion of their periphery, Fig. 3, and being adapted to engage respectively with the gear 10 and gears 6 or 7. The operation of the device is as follows : On rotating the knob 21 one set of teeth on the wheel 51 engage the gear 10 to move the slide 3 a certain distance in the direction P, the wheel 53 being meanwhile disengaged, Fig. 3a. On further rotation the gear wheel 51 disengages and the wheel 53 engages the gear 6 to move the casing in the direction Q, Figs. 1, 3b. Still further rotation causes the other set of teeth on the wheel 51 to engage the gear 10 and move the carrier in the direction P, Fig. 3c. Finally the wheel 53 engages the gear 7 and causes gear 8 to move the casing 2 in the direction Qa, Figs. 1, 3d. The carrier G therefore follows the path shown in Fig. 4. To move either the carrier G or the casing 2 independently the shaft 5 carries an intermediate gear wheel 53 having teeth round the whole of its periphery and the shaft is axially movable by means of a lever 19 to engage this gear with the gear 10. When so engaged the slide 3 may be moved through the gears 15, 11., 12, 13. To move the casing 2 the gear 15 is supported on a carrier 16 rotatable about the axis of the gear 10 which carrier may swing until the gear 15 engages the gear 7 permitting the drive to be transmitted to the gear 8 and the casing 2 moved along the slide 1. In a modification the slide 3 is driven, as before, through gearing, but the gears 7, 8 are driven by a pivoted lever having gear teeth over a short arc engaging the gear 7, and having a follower spring-urged against a cam on the continuously rotated shaft 5, the shape of the cam determining the shape of the movement parts of the carrier G (see Group XXIV). The shaft 5 is mounted in a slide which moves laterally to permit independent movement in two perpendicular directions.