Patent GB-322984-A (GB)
Title: Improvements in or relating to pulling over machines
IPC: A43D21/18
Filed: 1929-04-17
Abstract: 322,984. Stephens, A. J., (Nollesche Werke Kommandit-Ges.). April 17, 1929. Pulling-over. - Relates to machines of the kind described in Specifications 170,352 and 239,890, and consists in the provision of mechanism enabling the pincers to be closed and given their upper - stretching movements either manually by a treadle or bv power or by both in any desired succession, the pincers being held in their extreme position by ratchet mechanism and moved reversely and opened by separate, automatic means which can be coupled to the machine drive. For operating the pincers manually, a treadle 59, Fig. 1, is provided, pivoted to a yoke on a pin 62 which can oscillate about its vertical axis so that the treadle can move sideways as well as up and down. The treadle is normally centralized by a pin 65, the free end of which is restrained by oppositely disposed springs. The treadle can thus engage either or both of a pair of levers 41, 41<a>, Fig. 6, connected by links 42, 42<a>, Fig. 1, with the side and toe pincers respectively. The treadle is held in the stretching position by a pawl 69 engaging a ratchet 70. For operating the pincers by power, a clutch treadle 15, Fig. 5, carries a pawl 20 engaging a lever 11 on which is a step 10 normally engaging an arm of a lever 6 carrying a wedge 7 normally disengaging a pin clutch connecting a cam shaft 4 with a constantly rotating member. An adjustable link 14 connects the lever 6 with a lever 12 carrying a second clutch-disengaging wedge 7<a>. A third arm of the lever 6 carries a roll co-operating with cams 23, 23<a> on the shaft 4. First depression of the treadle 15 frees the lever 6, which under the pull of a spring 9 allows the clutch to engage with the effect of closing and drawing down the toe pincer. The cam 23 then, normally, disengages the clutch. On a second depression of the treadle, the side pincers are closed and drawn down and the toe pincer further moved downwardly. By adjusting the link 14 the wedge 7<a> can be put out of action and the complete single revolution of the shaft 4 then follows the first depression of the treadle. On the shaft 4 are cams 25, 26, Fig. 1, actuating the toe and side pincers respectively. These cams each operate a lever 28 having a yielding fulcrum 29 carried by a lever 34 supported by a spring 32 adjustable in strength by a screw 52. The other end of the lever 28 engages a lever 37 through the medium of a slide block 36, the lever 37 moving with a lever 39 resting on a pin 40 carried by the lever 41. To vary. the stretching pull, the block 36 is adjusted by a link 145 and lever and link mechanism 45, 46, 47 having an adjusting slide 48. To avoid consequential adjustment of the screw 52 after adjustment of the slide 48, the fulcrum 33 of the lever 34 is adjusted with the slide 48, a lever 57 and link 58, connecting the lever 45 with a slide block carrying a pin engaging a slot in the lever 34. The overdraw and tacking mechanism is similar to that described in the prior Specifications, a hand-lever 80; Fig. 10, coupling a shaft 71 to the power drive for one rotation. If the upper is to be pulled over by power, a pin 81 is inserted in an arm connected by a link 75 with a cam on the shaft 4. The lever 80, operated by hand after manual pulling-over, is thus operated automatically by the shaft 4.