Patent GB-297556-A (GB)
Title: Improved control device for the feed motions of the workpiece carriers in brush drilling and stopping machines
IPC: A46D3/06
Filed: 1927-08-23
Abstract: 297,556. Haddan, R., (Sternberg, V.). Aug. 23, 1927. Drilling brush-stocks. - A brush filling and drilling machine comprises a helically grooved drum rotated by a friction clutch, a locking device engaging the helical groove so as to cause the drum to be rotated intermittently, means actuated by the drum for imparting longitudinal movements to the work holders and a cam also actuated by the drum for imparting transverse movements to the holders. The machine. which drills one brush stock while another is being filled, is provided with two brush holders 6, 7, universally mounted on supports 9, 10, carried by a vertically movable frame 8, the movements of the holders being controlled about the two perpendicular axes by templates 12, 12a. Longitudinal movement is imparted to the holders.by a bar 13 guided in the fixed frame 11 at 14 and 15, the bar being attached by a pin and slot connection 17 to a link 16 secured to the two holders and reciprocated bv a link 19 and a variable throw crank 20. For transverse movement the work-tables are secured together by a rod 23 having a prismatic crosssection and passing through a vertical slot in a guide 29 on a horizontally slidable bar 30, the rod 23 carrying arms 24 secured to' horizontal links 25 attached to the tables by ball and socket joints 28. The bar 30 is moved, in one direction by a weight 46 and rope 47, and in the other direction by rack teeth 45 engaged by a, toothed quadrant 44 on a shaft 43 which is oscillated by a link 42 having a sliding extension 41 carrying at one end a block 39, the latter being reciprocated vertically by a slotted arm 38 on a vertical slide 36 having at its lower end a roller 37 in contact with a cam 33. The cam is mounted on a shaft 21 which also carries the crank 22 and a drum 31 provided with a helical groove and notches so that the drum, crank and cam may be rotated intermittently through a friction coupling 32. A spring-loaded pin is carried along the drum during its rotation by means of the helical groove and engages, the notches in succession to check the rotation until the pin is automatically removed again. The drum may be provided with two or more differently spaced series of notches for operating on brushes having differently spaced bristles. The position of the block 39 in the arm 38 may be adjusted to vary the amplitude of oscillation of the quadrant 44 and thus the stroke of the bar 30. When operating on oval blanks having similarly shaped rows of holes, a cam 33 of similar shape is secured on the shaft 21 and the block 39 is adjusted to give the work the lateral stroke required to operate on the outermost row of holes, whilst the throw of the crank 22 is adjusted for the longitudinal stroke. On completion of the outermost row a dog 57 on the drum trips a catch 53 having two teeth 54, 55 and allows a weight 50 to move a ratchet bar 51 through one tooth space, the bar being adjustably attached to a second bar 48 which carries an arm 58, in a slot 59 of which a block 60 is adjustably secured by a screw 61. A link 64 is pivoted at 63 to the block 60 and at the other end to a double lever 65, 67, the arm 67 being pivoted at 70 to a crescent-shaped member 71 pivoted to the sliding block 39. The latter is thus displaced to decrease the amplitude of transverse oscillation of the work holders. Simultaneously with this movement of the block 39 a bracket 72 on the bar 48 actuates a non- rotatable collar 75 slidably mounted on the shaft 21 to cause an inclined slot 76 in the collar to oscillate a lever 78 about its pivot 77 and cause the slide 82 which carries the crank pin 22 to be moved inwards and thus reduce the amplitude of longitudinal oscillation of the work holders. The crank and block 39 are similarly adjusted by the bar 48 after each complete row of holes has been operated upon, the movement of the work holders during such adjustment and while the drum is stationary serving to move the work in such a manner that the holes in one row are staggered in relation to the holes of the preceding row. To vary the spacing of the rows the ratchet bar 51 is changed for another of different pitch and to operate on straight rows the transverse mechanism operated by the cam 33 is disconnected.