Patent GB-190514139-A (GB)
Title: Improvements in or relating to the Supporting and Positioning of the Work in Machines used in the Manufacture of Boots and Shoes.
Inventor: BOULT ALFRED JULIUS
Filed: 1905-07-08
Granted: 1906-10-08
Abstract: 14,139. Boult, A. J., [United Shoe Machinery Co.]. July 8. Lasting; pegging; paring; burnishing.-Relates - to machines in which the shoe is moved longitudinally and rotated to transfer the point of operation of the tool round the shoe, such as in welt and turn shoe sewing-machines, outsole stitchers, lasting, pegging, and sole-edge trimming and finishing machines, and consists in providing automatic means to present the different portions of the shoe to the operating tool &c., instead of the shoe being manipulated by the operator. These correcting movements, which consist of lateral and longitudinal tipping, and lateral turning, are produced by relatively actuating the jack and the portion of the machine frame in which the tool &c. is mounted, about a centre substantially coincident with the point of operation of the tool. The machine described is a welt or turn shoe sewing- machine containing similar sewing-mechanism to that described in Specification No. 13,366, A.D. 1888, and provided with the usual channel guide and back gauge. The shoe is supported on a jack which is adjustable for shoes of different lengths, and is fed by a feed point 9 engaging the bottom of the channel in which the seam is laid. To enable this feed to take place freely, the jack frame is fixed to a spindle 11, Fig. 6, which can slide and turn in an arm 12 pivoted to an arm 14, which is swivelled in a bracket forming part of the machine frame. The several correcting movements referred to above are effected from a cam shaft 20. The turning movement, by which the edge of the sole near the needle is kept parallel to the line of feed, is caused by a cam on the shaft 20, which is engaged by a lever fixed to a rockshaft 23. The movement of the latter is transmitted through an arm 24 and sliding link, and chain and sprocket gearing 28, 29, 33, 34, to a wheel 35 loosely journalled on the spindle 11 and connected by a sliding pin 36 to the jack frame. The wheel 35 may be disengaged, to permit the jack to be turned by hand. The tipping movements, by which correction is made for both the longitudinal and the lateral curvatures of the sole, are imparted to the sewing instrumentalities. The sewing-mechanism is carried on a yoke 38 pivoted in a carrier 40 mounted on a rock-shaft 41, which is journalled in the machine frame. The tipping movements about the shaft 41 are caused by a cam 43 on the s haft 20 engaging a lever 44 pivoted to the shaft 23, the movement being transmitted through links 45, 46, 47, 48, 49 to the carrier 40. The link 49 is connected to the link 48 and to the carrier by universal joints. The tipping movements about the axis of the yoke 38 are caused by another cam on the shaft 20 engaging a lever 52 pivoted to the shaft 23, the movement being transmitted through links 53, 54, 56 and a sprocket chain 57 to the yoke. The sewing-mechanism is actuated by a cam shaft 61, which is started by depressing a treadle 72. The cam shaft 20 of the correcting-mechanism is also actuated from the main shaft 60 through a worm and wheel 73, 74, controlled by a clutch 75. In order that the correcting-mechanism may only be effective when certain points of the shoe are reached in the course of the operation thereon, the clutch 75 is connected by means, which are made partly pneumatic, to a controlling sole-shaped templet 78, Fig. 6, which is secured to a frame 77 journalled concentrically with the jack spindle 11 on a sleeve projecting from the arm 12. The templet is provided with a number of projecting studs or strips 79. The free member 80 of the clutch is connected to the piston of an air cylinder 84, Fig. 27, which is in communication with a main air-valve casing 86. The air valve 88 of this casing is connected to a pivoted lever 91, Figs. 6 and 9, carried by an arm 93, which is pivoted to another pivotally-mounted arm 95. The arm 93 has a lateral extension 97, Fig. 9, which is held by a spring against the edge of the templet 78, and is also provided with a detent 103, which normally holds a latch 99 pivoted to the lever 91 in such a position that the air valve cannot be opened. When, however, one of the trips 79 engages the latch 99, the lever 91 is released, whereupon the air valve 88 is opened by its spring, so that air is admitted to the cylinder 84, Fig. 27, which causes the clutch 75 to be thrown into gear. A stop prevents the passage of the trips past the latch 99 until the lever 91 is returned to its original position. Shortly after the clutch commences to rotate, the valve mechanism is re-set by the engagement of a cam on a shaft 108 with a lug on the valve spindle. This shaft is normally held stationary, but is released by mechanism actuated by a projection on the member 80, allowed to rotate once, and then brought to rest again by a stop. The member 80 is also constructed so that the clutch itself is automatically brought to rest after each revolution. In order that, when sewing round the toe of a narrow-toed shoe, the proper relative position of the shoe and sewing-mechanism shall be maintained, a supplementary valve-operating mechanism is provided to act independently of the templet 78. The lever 91 is connected to the valve stem by slides 123,124, which are normally hooked together. The shaft 20 carries a cam, which has a rise so located that, in operating on a boot of this type, the rise is brought into engagement with a trip-lever on the arm 95, so as to release the piston 131 of an air cylinder 130, and allow it to break the hook connexion between the slides 123, 124, whereupon the valve 88 is opened. After the toe has been sewn round, the cam has turned sufficiently to free the trip-lever, which therefore allows the connexion between the slides 123, 124 to be restored. The machine can be adjusted for shoes of different sizes, but of the same style, by altering the amplitude of the arm 95. This is effected by varying the point of engagement of a link 139 with a segmental lever 140. When shoes of different styles are to be sewn, the cams and templets must be changed, but where the styles are such that they differ only in the amplitude of the correcting movement required, this adjustment may be effected by altering the positions of the levers 44, 52, for which purpose these links are adjustably connected to the links 45, 53. Specifications No. 827, A.D. 1856, and No. 2651, A D. 1857, are referred to.