Patent GB-511987-A (GB)
Title: Improvements in machines for making golf balls
IPC: B29D99/00
Filed: 1938-03-25
Abstract: 511,987. Winding golf balls. BOGOSLOWSKY, B.' March 25, 1938, No. 9231. Convention date, April 28, 1937. [Class 120 (ii)] A machine for winding golf ball bodies comprises a rotatable mandrel, means for guiding a strand of elastic material to the mandrel for winding on the latter and means for producing relative oscillatory movement between the mandrel and guide means such that the period of each complete relative oscillation is longer than the time required for one complete revolution of the mandrel. The guide means is preferably oscillated with respect to the mandrel with a dwell at each end of the oscillatory movement and means may be provided for varying the amplitude of the oscillatory movement and the extent of such variation. As shown a removable mandrel 5 is screwed into the end of a driven shaft 1 and a pair of guiding means 13, 13<1> is provided so that two strands 10, 10<1> are wound on the mandrel, the guides 13, 13<1> are carried by levers 14, 14' pivoted on pins 15, 15' and to rods 16, 16' slidable in bearings 18 and carrying rollers engaging grooves 19, 19<1> in a cam 21 driven from the shaft 1 at a slightly slower rate. The cam is formed so that the levers 14, 14<1> dwell at each end of their oscillation and their amplitude of oscillation and, consequently, of the guides 13, 13<1> is varied by moving the pivot pins 15, 15'. The pins are carried by a bracket 30 which is slidably mounted in a sleeve 32 and carries a pin 33 engaging the bifurcated end of a lever 36 which is fulcrummed on a pin 37 in the casing 2 and has its other end connected to a nut 38 engaging a threaded shaft 39 rotatably mounted in bearings 40, 41. The shaft 39 is driven from the shaft 1 through reversing gearing 43, 44, 45, the gears 44, 45 rotating loosely on the shaft 1 and being alternately engaged by clutches 46, 47 splined to the shaft 1 and carried in a bracket 51 having a projecting lug 55 engaged by the arms 53, 54 of a member 52 which is carried by a pivot 64 and also has an arm 56 engaging a lug 57 extending from the nut 38 and an arm 58 engaging the teeth 59 of a rack 60 slidable in a holder 65. When winding begins, the lug 57 engages the arm 56 and rotates the member 52 on its pivot until a spring 62 moves across the pivot and snaps the member around its pivot so that the arm 53 engages the lug 55 and moves the bracket to disengage the clutch 47 and engage the clutch 46; at the same time the arm 58 is caused to engage the upper tooth of the rack 60. The rotation of the shaft 39 causes the raising of the nut 38 until it engages the lower end of the rack 60, further movement of the nut sliding the rack upwards in its holder until the spring 62 snaps the member 52 in counter-clockwise direction to reverse the rotations of the shaft 39. The rack is held in its raised position by spring- pressed balls engaging its holder 65 and on the next clockwise movement of the member 52, the arm 58 is caused to engage the next lower tooth on the rack and so allow the nut and consequently the lever 36 and guides 13, 13' to move through progressively increasing amplitudes before reversal takes place, the extent and period of variation of the amplitude of oscillations of the guide means being consequently varied; if winding is not completed when the rack reaches its uppermost position, the winding continues with a constant variation of amplitude. A spring finger 70 may be secured to a standard 7 so as to engage the periphery of the ball when it has reached the required diameter, the finger then 'acting as a brake to restrain the rotation of the ball and causing the mandrel 5 to become unscrewed from the shaft 1 so that the ball can be easily removed. The mandrel may have a weakened portion at the part where winding is begun so that, after winding, it may be easily broken by twisting its two ends in opposite directions and the two parts of the mandrel can then be easily removed from the ball. The mandrel may be oscillated relatively to the guide means in which case the mandrel is connected to the shaft 1 by a splined connection carrying pins engaging a bracket actuated from the cam 21 and having a pivot engaging the lever 36.