Patent GB-206802-A (GB)
Title: Improvements in brush forming machines
IPC: A46D3/06
Filed: 1922-05-04
Abstract: 206,802. Marks, E. C. R., (Kent-Owens Machine Co.). May 4, 1922. Drilling brush stocks; feed - motions; driving machine spindle; spindles. - In a brush - making machine of the type employing two work-holders, one for use with a drilling tool, the other for use with a tufting tool, a drill spindle 143, Fig. 1, having a pulley 145, driven preferably by a number of belts, is mounted in a bushing 147 within a plunger 148 which is mounted non- rotatably in a bearing 149. The bushing abuts at one end against the pulley 145, and at the other end against a thrust-collar 150. The plunger carries a roller 151 resiliently pressed into engagement with a cam 24 on a rotating shaft 2 by means of which the spindle is given a reciprocatory movement. Work holders, tables, and carriages.-Centrally arranged between the boring and tuft-setting mechanisms is a guideway 155, Figs. 1 and 10, containing slides 156, 157 with roller bearings 158, 159 respectively, for engaging cams 22 and 23. The slide 157 is connected to a yoke 160 carrying vertical rods 161, 162 which pass through the shanks of swivelled heads 165, 164 and are provided at their upper ends with slotted heads 182 supporting frames 168. Each head is formed with cheek plates 167 between which is mounted a frame 168 carrying a brush-back holding-chuck 169. The slide 156 is connected with a yoke 185 on which is mounted vertically-extending helical racks 186 which engage helical segmental gears 187 mounted on sleeves secured to the rods 161, 162. Each frame 168 is mounted on a pivot pin 170 the ends of which extend into guide ways 171 in the cheek plates and are secured to sliding blocks 172. Spring-pressed plungers 173 press the blocks 172 away from the drilling and tuft-setting mechanisms. Thrust-bars 174, preferably with a yoke connection 175, are slidably secured in guideways in the cheek plates. The forward ends of the bars are rounded and engage with pattern strips 176 secured to the rear of the chucks 169. The yoke 175 carries a pattern 177, arranged in a plane at right angles to that of each of the strips 176, and bearing against an adjustable roller thrust bearing 178. In operation vertical movement imparted to the slide 156 causes an oscillatory movement of the swivelled heads 164, 165, while vertical movement of the slide 157 oscillates the frames 168 about the pivots 170. The patterns 176 and 177 co-operating with the thrust-bars 174 and the thrust-bearing 178 maintain the proper relation of the brush-backs to the operating tools. The holder corresponding to the tuft-setting tool may be adjusted to correspond to a deflection of the drill when boring oblique holes by means of the thrust-bearing 178. The cams 22 and 23 may be formed by manually setting holders to successive positions of registration, the cam blanks being marked in each adjusted position. This is facilitated by the provision at the upper ends of the .slides 156, 157, of threaded sockets for engaging threaded shanks 188 engaged by wing nuts 189. The rollers 158 and 159 having been removed and replaced by marking devices for operating upon the cam blanks, the wing nuts 189 are turned to raise or lower the slides whereby the position of the holders is adjusted. For use with brushes where the tufts are set at right angles to the face of the stock a work-holder capable of holding a number of brush-backs may be employed. As shown in Fig. 16 a work-holder A is formed with a series of projecting pins D forming shoulders for engagement with a number of toothbrush backs. Spring-pressed jaws E engage the ends of the brush-backs, the springs abutting against a movable block J actuated by a cam K and handle L to adjust the tension of the springs. In boring and tuft-setting operations two holders A are mounted on guides W, Fig. 13 in a carrier M slidable horizontally on a vertically-movable carrier N. These carriers are actuated by rotary cams P, P<1>, through the medium of vertical slides Q, Q<1> and connecting mechanism. Brakes; stop-motions.-On the completion of the cycle of operations a brake shoe 192, Fig. 1A, is resiliently pressed into engagement with a groove 191 in the pulley 3 by means of a solenoid 194, the core 195 of which is connected by links 196 with a cam 197 bearing against a projection on the brake shoe. The solenoid is included in the motor circuit so that on starting the motor the brake is released, to be applied when the motor is stopped. The motor circuit is automatically opened by means of a projection 199 on the cam 23 which actuates a cut-out switch 200. Specification 20&.fi34, [Class 19, Brushing &c.], is referred to.