Patent GB-476166-A (GB)
Title: Improvements in or relating to machines for making brooms and brushes
IPC: A46D3/06
Filed: 1936-05-28
Abstract: 476,166. Drilling brush stocks. SHIPLEY, A. H., and BERRY, A. B. May 28, 1936, No. 15099. [Class 83 (iii)] [Also in Group XXIII] The invention relates to machines for drilling and filling brush stocks which are intended for sweeping and have a long handle extending from the back thereof. Separate or combined filling and drilling machines may be used. The object of the invention is to control the angular position of holes grouped round the handle orifice so that in the finished brush sets of bristles or tufts are distributed in uniformly close order throughout, without gaps X as in Fig. 7. Accordingly, in addition to the existing pattern cam-shaft of a brush-making machine, additional rotatable cam means are adapted to effect movement of the pivotal centre about which the workholder operates. In the machine, Fig. 1, there is a vertical drill 1 and a filling tool 2 with customary work-holders 3 and rocking frame 44 which are given the usual side and end spread. The carrier frame 4 has a main portion 5 and thick side members 6. Swivelling movement is imparted to brackets 9 by a side spread cam (not shown), so that the stock moves in an arcuate path a. The two brackets 9 are connected by a longitudinal member 13 operable from the cam on the existing pattern shaft 14. The members 13 are disposed below and at right-angles to the arm of spindle 8. For the purpose of the invention, the lower part of each of the side portions 6 is recessed at 16, Fig. 6, for the reception of a bearing plate 17 and each bearing plate is recessed at its lower end at 18 for the reception of a slidable bearing block 19 mainly circular in shape but with a flat surface to slide on a guideway 21 on a relatively stationary part of the machine. The shape of the recesses in the bearing plates conform to the external shape of the slidable bearing blocks and in this way the carrier frames 4 can rock on the blocks. Axial movement of the blocks is prevented by an upstanding flange 22 contacting with the vertical wall on an adjacent part at the casting 5. The additional or transfer cam 24 of the invention is connected to the slidable blocks 19. The transfer cam consists of a number of sections bolted to an upstanding flange 25 on a rim 26 of a wheel 27 on the shaft 14. The cam-shaft is intermittently rotated by pawl-and-ratchet mechanism. A pawl 28, Fig. 2, is carried on an arm 29 oscillated by linkages 30, 31 operated from a crank motion (not shown) connected with the main shaft. The ratchet wheel 32 has a pinion 33 meshing with a gear-wheel 34 secured on the shaft 14. A suitable clutch mechanism may be provided in association with the crank motion. Mounted just below the pattern shaft is a rock-shaft 35, Fig. 3, carrying an arm 36 and a roller 37 which follows the contour of the cam 24. At the top of the arm 36 is a link 38 connected with one of the slidable bearing blocks 19. A similar arm spaced from the arm 36 is similarly connected to the other slidable bearing block. The roller 37, Fig. 3, is kept in contact with the cam 24 by springs 40 or by an adjustable weight. When the roller contacts with the concentric part of the transfer cam 24 the bearing blocks 19 are central and the carrier 4 rocks about a normal centre. Other parts of the cam cause corresponding movements of the slides 19 and the pivotal centres of the carriers change with corresponding effects on the angularity of the brush blocks and bristle holes. The carrier 4 is moved longitudinally in the arcuate path b, Fig. 3, by a cam 41. Below the shaft 35 is a spindle 42 in a bracket 43 on the bed 44 of the machine. An arm 45 on the spindle 42 is connected by a link 47 with a column 46 projecting upwardly from the casting 5. Between its ends the arm 45 carries a roller 48 connected with the end spread cam 41. The lever 45 is moved in the arcuate path c with a corresponding movement of the carrier 4. When the pivotal centre is moved to one side or the other of the normal centre, the carrier 4 pivots about a centre 53, Fig. 3, so that the holders. 3 are suitably tilted as indicated in broken lines. A compensating cam for height is arranged by parts 21, Fig. 1, and a vertically disposed slide 54 operating in a recess formed in a bracket 56 in the bed of the machine. The slides are operated by the compensating cam (not shown) through intermediate levers 57.