Patent GB-442612-A (GB)
Title: Method of and means for needle-pointing and treating the dents on dismounted flats used in carding engines
IPC: D01G15/38
Filed: 1934-10-20
Abstract: 442,612. Grinding and sharpening wire cards. DRONSFIELD, J., c/o Dronsfield Bros., Ltd., Oldham. Oct. 20, 1934, No. 30084. [Class 60] The teeth of card filleting carried on dismounted flats from a carding-engine are pointed by mounting the flats on moving supports which carry them through a normally circular path, to and from the grinding tool, but are resiliently mounted so that they may move 'out of the circular path and also " feather " or pivot to enable the flats to travel in a straight path whilst the teeth are being acted upon by the tool. In the apparatus shown, the flats are held at each end in clamps carried by supports resiliently mounted on the peripheries of two circular rotary carriers a which are adjustable axially on their driving shaft s so that the distance between them may be varied to suit the length of the flats. The supports comprise blocks b radially movable in gaps a<1> in the peripheries of the carriers a and urged outwardly by springs b<2> surrounding studs b<1> screwed into the blocks and passing through apertures in circular flanges a<8> on the carriers. To each block b is attached by a pivot pin b<4> a trough-shaped member b<3>, the flanges of which straddle the edge of the carrier a, and which carries the clamp members b<6>, b' for the end of the flat bar, As the carriers a revolve the flats are carried past a needle-point grinder A, a burnishing roller h, and a surfacing grinding roller d, and at each of these stations the members b<3> come into contact with straight slides c which cause them to move in straight paths while passing the rollers. Spring- pressed plungers b<5>, Fig. 10, maintain the members b<3> at the correct angle to engage with the guides c. The carriers a are mounted on sleeves a<2> which rotate in bearings formed in brackets a<5> which are adjusted along crossrails a<6>, a<6x> when the spacing of the carriers is altered, and the guides c are attached to the brackets a<5>. The driving-shaft s of the carriers is rotated at a slow speed by means of epicyclic gearing in the driving-pulley s<1> and reduction gearing 7, 8, 9, 11. The needlepoint grinder A automatically advances and retracts grinding discs between the teeth, and may be substantially identical with that described in Specification 380,957. The burnishing roller h is carried in bearings adjustable by hand-operated screws h<2>, and may be reciprocated axially by the known device m mounted on it and attached by an anchoring link m<1> to a fixed bracket. The surfacing roller d, which may be covered with grooved emery filleting, is carried by bearings mounted on levers d<2>. As shown in Fig. 1, one end of each lever is pivoted to the strap of an eccentric d<6> which is rotated through worm gearing by a hand wheel d<12> in order to adjust the roller vertically to and from the work. To enable the initial setting of the roller to be repeated for each batch of flats, a small gear on the shaft of the hand wheel engages a larger gear having a projection which engages an adjustable stop, these parts not being shown. The other end of each ]ever d<2> is carried by an eccentric j<24>, both eccentrics being mounted on a shaft j<23>, Figs. 12 and 13 which is slowly rotated in order to raise the ends of the levers and feed the roller upwardly during grinding. The shaft j<23> is rotated by worm and wheel gears j<21>, j<22> from a shaft j<20> which is rotated by further worm and wheel gears j<15>, j<16> from a shaft j<1> driven through a clutch j<3> by a chain wheel j<2>. The clutch may be operated by a hand lever j<4>, which carries a pivoted catch j<11> by which it is held in position to keep the clutch members engaged. At the end of the grinding operation it is raised by a cam j<25> on the shaft j<23> allowing the clutch to open, and stopping the feed. To re-set the roller d, the shaft j<23> is rotated to its initial position by rotation of the shaft j<20> by a handle j<21>, a pawl-and-ratchet drive between the worm wheel j<16> and shaft j<20> allowing the latter to be rotated independently of the former.