Patent GB-649024-A (GB)
Title: Improvements in or relating to a brush making machine
IPC: A46D3/06
Filed: 1947-02-24
Abstract: 649,024. Staple driving mechanism. CARLSON TOOL & MACHINE CO. Feb. 24, 1947, No. 5297. Convention date, June 5, 1940. [Class 89(iii)] [Also in Group XXIII] A staple driving mechanism for a brushmaking machine including two slides carrying staple forming and holding jaws and a staple driver, said slides being longitudinally movable relative to a stationary supporting member of the machine and relative to each other and being independently guided on said supporting member, is characterized in that a member is provided for interconnecting the slides and for stiffening them, 'said member being rigidly mounted on one of the slides and having a slidable and closely fitting engagement with the other slide. This provision eliminates binding of the slides in the guides on the stationary supporting member, and makes for a sturdy construction rendering the mechanism capable of high speed operation. As shown, the mechanism comprises an upper or driving slide 30 and a lower slide 31, both reciprocable in a vertical guideway 32 in a plate 33 supported on a cross member 13 of the machine frame. The upper slide is actuated by means of a link 36 and pivoted lever 34. A driving connection between the two slides is provided by means of a bell-crank 40 pivoted at 41 on a bracket 42 projecting laterally from upper slide 30. One arm of the bell-crank carries a follower 44 which engages a cam-groove 45 in plate 33; the other arm is provided with a stud 47 about which pivots a cross-head 49 connected by bolts 52 to another cross-head 50 pivoted about a stud 51 secured to lower slide 31. The slides 30 and 31 move in unison in their downward movement until cam follower 44 reaches portion 45<SP>1</SP> of the cam groove whereupon the bell-crank 40 is rocked clockwise causing the lower slide to move downwards more slowly than the upper slide for reasons indicated below. The underneath faces of slides 30 and 31 are formed with channels 56 and 57 which receive the ends of a rigid flat stock bar 59. The bar 59 is rigidly but adjustably secured at one end to upper slide 30 and at the other end makes a snug sliding engagement with lower slide 31. The lower end of bar 59 carries a block slidably received in a slot 58 formed longitudinally in slide 31. A staple driver 62 is placed on top of the block and on top of the driver is placed a cam 63, all three being secured to member 59 by bolts 66. A pair of jaws 68 are mounted on the slide 31 and in their downward movement with this slide serve to shape a cut length of wire into a staple and to guide the staple as it is driven into a brush back. These jaws are pivoted intermediate their ends on pins 69; cam followers 70 carried by the upper ends of the jaws are held in engagament with cam 63 by a tension spring 71. When the slides are given their relative movement as described above, the followers 70 ride up the wide portion 63<SP>1</SP> of the cam causing the jaws to converge at their lower ends and impart an inward set to the legs of the staple. The relative movement between the slides also causes a corresponding relative movement between the staple driver and the jaws 68 whereby the staple is driven from the jaws into the brush stock. The staple driving mechanism is utilized in a conventional type of brush-making machine as illustrated in Fig. 1 of Specification 649,075, [Group XXIII].