ECCENTRIC MECHANISM FOR CONVERTING A ROTARY MOVEMENT INTO A RECIPROCATING RECTILINEAR MOVEMENT OF VARIABLE AMPLITUDE

摘要

1282004 Linkwork; bearings MICROMEDIC SYSTEMS Inc 15 Aug 1969 [16 Aug 1968] 40899/69 Headings F2A and F2K Rotation of an input shaft 3 is converted into reciprocating movement, of variable amplitude, of an output member 43 by a mechanism comprising a crank-pin in the form of a rod 14 which is driven in such a way as to describe a core having an axis 26, Fig. 2, a runner 27 within which the rod 14 can slide, screw-and-nut mechanism 46, 47 for adjusting the longitudinal position of the rod 14 relative to the runner 27, and a yoke member 42 connected to output member 43 and to a rod 31 which guides the runner 27 and is constrained to move in a direction 39 perpendicular to the core axis 26. The rod 14 is secured at one end to a plate 15 which carries slide blocks 10, 11 which are disposed in grooves 8, 9 in a cup-shaped member 5 secured to the input shaft 3. The other end of rod 14 carries an eccentric lug 17 on which is secured a ball 18 retained by a plate 21 in a socket 19 formed in a slide member 20. Rotation of a knob 65 causes rotation of a sleeve 48 carrying the nut 47 and axial movement of slide 20, thereby causing axial movement of rod 14 to vary the amplitude of reciprocation of the output member 43. In the position shown, the rod 14 is parallel to the axis of cup-member 5, and it may be located in that position by a ball 70. Thus the upper limit of reciprocation remains fixed. The sleeve 48 is rotatably mounted with respect to a support 60 by a resilient bearing formed by a triangular frame comprising resilient rods 51, 52 and 53. The ends of the rods are held in the support 60 whilst their middle points co-operate with a circular groove 64 in the sleeve 48.