Patent GB-191016186-A (GB)
Title: Improvements in or relating to Sewing Machines for use in the Manufacture of Boots and Shoes.
IPC: D05B67/00
Filed: 1910-07-06
Granted: 1911-09-06
Abstract: 16,186. Bates, A., and British United Shoe Machinery Co. July 6. [Cognate Application, 17,505/10.] Boot-sole sewing machines; driving.-In machines for performing successive operations round the marginal portions of boots or shoes, such as sewing or nailing, the turning of the worksupport or horn automatically controls the rate at which the successive operations are performed according to the requirements of the work. The invention is described with reference to a sewing-machine in which a cam K on the horn B controls variable-speed gear to accelerate the speed when sewing on a straight part and to retard it along the curved parts, such as the toe. The cam K is connected by levers K<1>, K<4> to a bell-crank lever K<5>, which carries an arm K<6> to which is connected one end of a brake band H<2> passing over disk H<1> attached to a bevel-wheel H, the other end of the band having a fixed connexion. The wheel H, together with a wheel J, gear with pinions G<2> on studs G<1> of a driving- pulley G, all being loose on a main shaft A'. When the band H<2> is loose, the wheels H, J are driven with the pulley G, but when the band is tightened through the action of the cam K owing to the turning of the horn B, the wheel J is driven at an increased speed, to allow of which a roller clutch J<3> is interposed between the wheel J and the pulley G. The wheel J drives the shaft A<1> by means of a clutch consisting of members J<1>, J<2> the latter comprising a disk secured upon the shaft A<1>, to which disk is attached a split ring J<3Î> having its ends connected by a spring-pressed toggle J<5> to clutch it to the inner surface of the member J<1>. A fixed concentric brake member L lies within the ring J<3Î>. The toggle J<5> is normally held out to stop the machine by a pivoted lever M having an inclined surface M<1> engaging a roller J<7> on the toggle-joint. The lever M is connected through another toggle M<3>, with a spring- pressed treadle-rod M<5>. When the treadle is depressed to start the machine, the lever M is moved away from the roller to allow the toggle J<5> to expand the clutch ring J<3Î> to start the machine; on the release of the treadle, the surface M<1> is forced into the path of the roller J' to uncouple the clutch members. The surface M<1> may form a positive stop for the roller J<7>. The cam K may be mounted on an extension of the horn, connected to the horn by pin and slot, so as to rotate therewith but not partake of any vertical movement. In a modification, one of the bevel-wheels carries a clutch member O, Fig. 6, adapted to engage frictionally an adjacent disk on the shaft A', this wheel being mounted on a sleeve Q extending from the other bevel-wheel, which is provided with a disk Q<1> surrounded by a band H<2>. The boss of the first wheel forms a bearing for the pulley G, and the whole is adapted to be moved laterally by a wedge R actuated from a treadle-rod R<1>. The horn B<Î> is mounted on a carrier B<10> on a post B", the carrier having an extension B<12> carrying a cam B<13> to engage a roller S<1> on a spring-pressed rod S. The rod S is attached to a bell-crank lever S<2> connected to the band H<2>. The rod R<1> also carries a collar R<2> with a pin R<3> for actuating a pivoted rod R<4>, which carries a roller R<6> adapted to engage a cam S<4> on the bell-crank lever S<2>, so that when the treadle is partly depressed, the engagement of the roller R<6> with the cam S<4> prevents the rod S from moving with the cam B<13> to vary the speed. A lostmotion connexion T allows the further movement of the treadle to release the cam S<4> without affecting the wedge R. Specification 10,148/11 is referred to.