Patent GB-1053739-A (GB)
IPC: A46D3/06
Abstract: 1,053,739. Brush-making machines. J. EVANS & SON (PORTSMOUTH) Ltd. Nov. 19, 1963 [Nov. 21, 1962], No. 44048/62. Heading A4K. [Also in Division B3] In a brush stock drilling and filling machine, a brush is completed at each of six work-holders by drills Da, b and c and tuft inserters Fa and b in a three stage working cycle. In the first stage, two drilled stocks are filled at c 1  and c 2  and two unbored stocks are drilled at b 1  and b 2 . The clamps of holders a 1  and a 2  are released to allow unbored stocks to be placed in them. On completion of the first stage, the support Sa is transferred through one step into the second stage position and the stocks at a 1  and a 2  are clamped and the completed brushes at c 1  and c 2  released. During this and the following stage brushes are completed at a 1 , a 2  and b 1 , b 2  and removed from the latter. Unbored stocks, inserted at c 1  and c 2  during the second stage, are drilled, during the third stage, by drills Db and Dc respectively. On completion of the third stage, the support Sα is returned in a single stroke to the first stage position and the completed brushes at a 1  and a 2  unclamped. Holders b 1  and b 2  are provided with unbored stocks during the third stage. The cycle may be carried out with two drills and one tuft inserter (Fig. 1, not shown). As an alternative to the step-wise movement of the work holders, the tools Da, b, c, Fa and b may be displaceably mounted on a bar and moved by fluid pressure cylinders (Figs. 10-12, not shown). In other forms (Figs. 15-20, not shown) the work-holders are moved in a circular arcuate path. An additional working stage such as trimming may be included in the cycle. Control of tuft inclination: Figs. 6a and 8; in all forms the work-holders are mounted in pairs of mutually pivoted bars 56, 57, 62, 69 and 63, 69, the bars of each pair being lockable against pivoting to produce lines of bristles in each of which the tufts are parallel. In order that transverse lines shall have parallel tufts, in addition to locking pairs of bars 62, 68 and 63, 69, the engagement between the workholders and toothed bar 8 is released by moving screw 77a back from the path of piston 77. During the step-wise movement of the work-holders, however, fluid pressure is applied to piston 77 so that they are locked on to rod 80. When the pairs of bars 62, 68 and 63, 69 are not locked against mutual pivoting, this may be prevented, during the step-wise movement of the work-holders by fluid operated means pi (Fig. 8a, not shown). The same longitudinal line of bristles may include parallel and non-parallel tufts, produced by two pattern cams having alternatively effective concentric dwell positions. In another form (Figs. 13 and 14, not shown), additional pattern cams are provided for producing a further inclination of the tufts by varying the inclination of the tools. Work locating means: fluid pressure cylinders 67 and 86 control the clamping of the stock in the work-holder and the location of the work-holder along rail 72a (by plunger 88 entering holes 89a, b or c) respectively. Cylinders 67 and 86 and worker-holder displacing cylinder 82 are operated by undisclosed means in timed relationship with the other operations. Control point CP co-operates with a master clamped in work-holder d 1  which does not take part in the step-wise movement.