Patent GB-214168-A (GB)
Title: Improvements in automatic machines for drilling and tufting brush stocks
IPC: A46D3/06
Filed: 1923-03-14
Abstract: 214,168. Dehn, F. B., (Northboro Brush Co.). March 14, 1923. Drilling brush stocks. -A machine for drilling and tufting brush backs comprises a vertically-movable frame carrying an intermittently-rotatable and longitudinally-movable turret for holding brush backs, means being provided for controlling the movements of the frame and turret so as to move each brush back first successively and step-by-step crosswise by moving the frame then to move the brush back longitudinaly one step by moving the turret then to restore it to a first crosswise position and thereafter to repeat the operation, a tuft being set in each position in one of the brush backs while a hole is drilled in each corresponding position in another back carried on the opposite side of the turret. The machine shown in Fig. 3 is provided with means for forming tufts, means for transferring each tuft in a position opposite a brush back and means for inserting the tuft in the back. This part of the mechanism is described in Specification 213,419. Driving the brush turret, Figs. 3, 4, and 7. The brush turret is provided with a gear wheel 116 adapted to be intermittently rotated through the medium of a sliding pinion 54 keyed to an index clutch shaft 53 consisting of two parts connected by a joint 56. To the shaft is secured a clutch member 55 and a spring tending to couple the member to a loosely-mounted gear wheel 52 meshing with a gear wheel 51 fixed on a rotating shaft 50. A groove is formed in the clutch member for engagement with a roll provided on the end of a spring-pressed arm 59 which is secured to a shaft 58. When the roll moves into the end of the groove it draws the clutch member away from the gear wheel 52 and stops rotation of the shaft 53. A spring-pressed locking arm 63, for ensuring that the shaft 53 will rotate exactly one complete revolution at a time, is loosely mounted on the shaft 58 and is formed with a wedge-shaped projection for engagement with a groove 67 in the member 55. The locking arm, when the arm 59 is drawn back, is moved with it by means of a projection 64. A rotating shaft 74 is provided with a dog 77, which at the end of each revolution of the shaft engages an arm on the shaft 58 oscillating the latter whereby the roll on the arm 59 is temporarily freed from engagement with the groove 61 and the index clutch shaft 53 is allowed to make a complete revolution and cause partial rotation of the turret gear wheel 116. Longitudinal turret motion, Figs. 3, 4, and 13. The shaft 74 is intermittently rotated by a ratchet 76 and a pawl 75 in conjunction with a lever 73, a link 72, and a lever 69 with a roller engaged on a cam 70 on the shaft 50. A cam 80 is mounted on the shaft 70 and is formed with a spiral groove having a series of steps each except the last one corresponding to an advance of three steps of the ratchet 76. The groove is engaged by a roll 82 on the end of a lever 83. Rotation of the cam 80 moves the roll further away from the shaft 74 thereby, through the medium of the lever 83, lever 86, and a yoke 87 with pins engaging between flanges on a roller surrounding the pinion 54, the pinion and the turret wheel 116 together with the turret are given horizontal movement. The cam 80 is provided with a spring-held pawl so that at the end of a complete revolution of the cam the roll 82 is directed to the inner portion of the spiral groove. Vertical turret motion, Figs. 3 and 7. The periphery of a cam 95 mounted on the shaft 74 is formed with sets of three steps, each set corresponding to a step in the groove in the cam 80. A roller 96 resting on the cam 95 is connected to a vertical rod 98 attached to a rest 99 supporting the frame 41. Rotation of the cam causes the roller to be lowered and raised, whereby the frame 41 is moved on its pivot and the turret is moved vertically. The combined horizontal and vertical movements of the turret are employed to drill and set tufts in a brush back in the order indicated in Fig. 16. Drilling, the brush back, Figs. 3 and 17. The drill spindle 103 is rotated by a pulley 104 and a driven be@t and is reciprocated by means comprising a lever 101, a link 100 and the lever 69 which is oscillated by means of a cam on the shaft 50. While a hole is being drilled in one blank a tuft is being set in a corresponding position in a blank carried on the opposite side of the turret. Supplying brush blanks, Figs. 3, 22, 23 and 28. The gear wheel 51 on the shaft 50 drives through a pinion 119, a wheel 120 loose on a cam shaft 121. This shaft carries a spring- pressed clutch member 122 which is formed with a groove for engagement with a roll on a spring pressed lever 123. The lever is pivoted on a support 124 and has a pin 125 adapted to be engaged by a cam 126 on the shaft 53 to disengage the roll and allow the shaft 121 to rotate. A cam 131 on the shaft 121 controls a roll 132 on a link 133 which is connected to one end of a lever 134, the other end being connected to the brush blank hopper 136 comprising an inclined back plate and two adjustable side plates. The hopper is thereby brought into registration with the brush turret. A second - cam 140 operates a roll 141 on a lever 142 pivoted to;the shaft 58 and having a lost motion connection with a rod 143 by means of which a plunger 147 is reciprocated along a guide on the bottom of the hopper. The plunger carries a pusher 149 and a rod 150 provided with stop nuts 151, the rod passing through a slot in a pivoted feed finger pawl 152. In the position shown in Fig. 28 the lowest brush blank in the hopper is supported by a plate 157 carried by the pusher so as to project over the brush turret, the next blank being supported by a projection 153 on the pawl 152. When the plunger is moved to the right the lowest blank is forced into jaws or. the brush turret and the next blank is released from contact with the projection 153 by the action of a spring 154. Brush blank turret, Fig. 17. The frame 41 is provided with bearings to support a shaft 111 and a sleeve 110 in which the shaft has a bearing. The turret is rotably mounted on the shaft 111 and comprises a hub 158 and a plate 159 in which are journaled shafts 160 carrying radially projecting jaws 161. Corresponding movable jaws 162 are pivoted on the shaft and are normally pressed by springs 163 against sliding wedges 164 located between the jaws. The jaws are provided on their edges with lips to engage the brush blanks. Means for operating the jaws comprise a cam 170 acting in conjunction with levers 171 and 175 and a link 176 to reciprocate a slide 178 which is formed with two projections 179 to operate two of the wedges. Each wedge is provided with inclined slots 180 engaging pins 181 carried by the stationary jaw, whereby inward pressure on the wedge raises it to clamp a brush blank beneath the projections on the pair of jaws. Ejector mechanism, Figs. 22 and 34. The lever 142 actuated by the cam 140 and the roller 141 operates a vertical rod 190 adjustably connected with an arm 191 on a shaft 192 carried by an ejector frame 193. A second arm 194 is connected by a link 195 to a lever 198 slotted at one end to engage a pin 199 on an ejecting hook 200, which is mounted on a slide 201. By means of these arms and links the slide is reciprocated, the hook 200 engaging the end of the brush stock C and ejecting the brush.