GB1288935A - - Google Patents

Abstract

1288935 Needling machines HINDLE SON & CO Ltd 27 May 1970 [14 May 1969] 24569/69 Heading D1R A plurality of main eccentrics 7, symmetrically spaced along the single driving shaft 8 of a needling machine, reciprocate needle beam 4 through connecting rods 10, wrist pins 11 and brackets 12. An equal or lesser number of symmetrically spaced counter eccentrics 17 are angularly displaced through 180‹ to main eccentrics 7, and are connected via rods 20 to counterweights 18 arranged substantially vertically above shaft 8 to balance beam 4. Preferably the counterweights 18 are cylindrical pistons sliding in vertical tubes 19, or guided by vertical slide bars. Alternatively the counterweight (18A, Fig. 3, not shown) are secured to the free ends of generally horizontal radius arm (21), the fulcrums (22) being mounted on bridge beam 1, so that the counter-weight (18A) oscillate over a small arc approximately vertically above driving shaft 8. Preferably the main and counter eccentrics 7, 17 have the same throw, connecting rods 10, 20 are of equal length, and the total weight of the counterweights 18 equals that of needle beam 4. Alternatively the ratio connecting rod length to eccentric throw is identical for 7 and 17 and the total weight of the counter-weights times the throw of the counter-eccentric equals the weight of the needle beam times the throw of the eccentric. The shaft mounts concentric flywheels 16, and is driven by electric motor (15, Fig. 2) via V-belt pulley 13.