Patent GB-190221786-A (GB)
Title: Improvements in Machines for Sewing Boots and Shoes
Filed: 1902-10-07
Granted: 1903-10-07
Abstract: 21,786. Lake, H. H., [Steam Heated Horn Co.]. Oct. 7. Boot-sole stitching- machines ; driving speed, regulating ; stopping-gear.-Fig. 1 is a general view of the machine, which is of the McKay type. The invention includes, among other things, means for driving at two different speeds to suit the work, the slow speed being used when sewing round the toe and heel. The machine is driven from a shaft 18, which carries pulleys 21, 22 of different sizes. The belts 19, 20 drive pulleys 16, 17, either of which can be operatively connected with a shaft 13 by a friction clutch, shown separately in Fig. 16. The pulleys are attached to cones 23, 24, which act in connection with friction cones 25, 26 rigidly fixed to a shaft 13. The shaft 13 is capable of slight longitudinal movement, and the low-speed pulley is normally kept in action by a strong spring 27. It may, however, be shifted so as to bring the high speed into gear by a pedal-actuated lever 28 carrying a roller 290, which bears on a collar 30 and moves the shaft sideways. A pulley 12, fast on the shaft 13 drives a pulley 9 on a shaft 8 by means of a belt 10. The connection of this pulley with its shaft forms a stopping and starting gear. The pulley runs loosely on the shaft and is fixed to a ratchet-wheel 41, Fig. 12. A disc 38 is fixed on the shaft, and carries a pawl 39 which is held up to the ratchet-wheel by a spring 42, excepting when the tail of the pawl encounters a pin 44 on a lever 46. This lever is connected with the same foot-lever which actuates the two-speed clutch previously described, but the connection is a loose one, so that the speed can be regulated without stopping the machine, which must, however, always start at the slow speed. The lever 46 carries a spring brake 56, which operates when the pawl and ratchet-wheel are disconnected. Presser-feet; presser lifted automatically.-The presser-foot 60 is adjustably screwed to the presserbar 61, which slides on the frame, as shown in Fig. 6, its travel downwards being limited by a screw stop 69. It may be raised by a lever 79, which is actuated by foot, for the purpose of inserting the work. It is raised automatically at each stitch to enable the feed to take place, and then let fall upon the work so as to accommodate itself to varying thicknesses of material. For these purposes, it is actuated by a lever 73 which carries a pin 72 projecting between two jaws 70, 71 on the presser bar. The lever 73 is mounted on a shaft 74, which is acted upon by a coiled spring in such a way as to force the presser-foot against the work. The shaft 74 also carries an arm 83 provided with a blade 85, which extends between a lever 86 loosely mounted on the shaft and a spring 90 carried by the lever 86 and forming therewith a clamp for looking the blade 85. The lever 86 and arm 83 are thus normally locked together, and, as the arm 83, is considerably longer than the arm 73, which directly operates the presser-bar, the latter is held firmly. A camwheel 93 on the main shaft 8, however, performs two operations once in a revolution ; (1) it shifts the lever 86 and thus raises the presser-foot while the feed is taking place, and then (2) it unclamps the blade 85, thus letting the presser-bar down and immediately clamps it again. Needle-driving; chain-stitching machines.-The length of the loop of thread drawn up by the needle is made to correspond with the thickness of the work by varying the upward travel of the needle. The needle-bar 106 moves friction-tight in its guides, and has a collar 112, to which is pivoted a lever 111, operated by the main shaft through a crank 109 and connecting-rod 110. The lever 111 works between two lugs 113, 114 on the collar 112, and thus moves the needle-bar up or down as the case may be whenever it strikes one of the lugs. An additional upward movement is given to the needle-bar when the lever 111 strikes a pin 117 on a lever 116. This lever is governed by the lever 73 so that the upward travel of the needlebar is controlled by the presser-bar mechanism and thus corresponds with the thickness of the material. Needles, hook, cast-off devices for.-A cast-off 123 slides in a groove 124 in the needle-bar, and terminates in a head 125, which is acted on by a spring 126 connected with the collar 112. A collar 127, which embraces the needle-bar and engages with a head 125, passes friction-tight through the needle-bar guide. The upward movement of the collar relative to the needle is regulated by a stop 1311. Feed.-A feed-point 131 is knuckle-jointed to the feed-bar 133, so as to bend when it moves backwards to its initial position.