Patent GB-191114672-A (GB)
Title: Improvements in or relating to Sewing Machines.
Inventor: MEYER WILLIAM CRISTIAN
IPC: D05B27/02
Filed: 1911-06-21
Granted: 1912-06-20
Abstract: 14,672. Meyer, W. C. June 22, 1910, [Convention date]. Boot-sole sewing machines, welting a n d turnshoe. - The shank 52, Fig. 2, of a weltguide 51 is pivoted upon a rod 54 at 53, and its further end is guided by means of a cam-slot 55 which embraces a bowl upon it. The movement of the welt-guide consequent upon the reciprocation of the rod 54 and the control of the camslot is substantially in the path of the needle, so that the position of the welt relative to the needle is independent of the thickness of t h e work. The rod 54 is supported by two levers 58, 63, the former of which is also the lockoperating lever. T h e rod is pressed towards the work by two springs 56, 57, but prior to the welt-guide reaching the work, this spring 57, in expanding, meets an adjustable stop 70 and ceases to be effective. Thus the welt-guide contacts with the work under the pressure of the lighter spring 56 alone. A screw 66 on the lever 63 engages with a spring-pressed plunger 65 when no work is in the machine, and thus an outer limit for the movement of the welt-guide is provided. The position of the welt-guide is adjusted by means of the bracket upon which the lever 63 is mounted. This bracket is slidingly mounted on the machine frame, and can be adjusted by means of a screw 67 secured in the bracket and threading in a nut 68 held between two lugs on the machine frame. The rod 54 is moved backwards to withdraw the weltguide by means of a roller-lock comprising a roller-carrying box 60 and plates 74 having inclined roller-engaging surfaces and carried by a block 61 pivotally secured upon the lever 58. The box 60 is urged towards the block 61 by. a pair of spiral springs (not shown). In the forward movement of the rod 54, these springs are overcome by the engagement of a part of the frame with a shoulder 75 on the box. When the block 61 is moved backwards, the springs retain the box 60 until the lock is effected, and thereafter all moves together. A similar lock is provided for giving a small positive forward movement to the welt-guide and for locking the same. In this lock, the box 59 has freedom for only a small movement in opposition to a plate spring. The lever 63 is adapted to be turned so as to withdraw the welt-guide from the work by the usual swinging link adapted to be actuated by the main shaft on reversal. The Specification as open to inspection under Section 91 (3) (a) comprises also the following matter:- Needles, driving; perforating-devices; feed by awl and channel guide.-The curved needle is pivoted upon the machine frame and is linked to a bell-crank lever 5, Fig. 5 (cancelled), pivoted upon a fixed sleeve 10 through which the feed-slide shaft 26 slides. The awl moves in a path of radius smaller than that of the needle path, and is mounted upon a bracket 21 adjustably secured to a feed-arm 22, Fig. 2 (cancelled), carried by the feed-slide shaft 26, and is linked to a bell-crank lever 24 mounted upon the shaft. The levers 5, 24 are connected to their camlevers 7, 25 by a link 6, Fig. 9 (cancelled), and a cross-head 12 respectively, the lever 24 having lateral freedom upon the extended pivot-pin 27. The levers 5, 7 and the cross-head are confined between guide-surfaces 11, 28, and the link 6 is in sliding engagement with the cross-head. A channel-guide 29 is adjustably secured to the awl-carrying bracket on the feed-arm, and cooperates with the awl in feeding the work. The feed-arm receives the feed-movement from a usual feed-lever 33, and is extended upwards to engage a cam-disk which imparts a tilting motion to it periodically to lift the channelguide from the work. Governing needle thread.-The thread finger 35 is carried by a shaft 36 mounted obliquely in the machine frame, which is oscillated by means of a cam-actuated slide 39. The slide is connected to an arm on the shaft 36 by a telescopic link 38, which in the normal working of the machine remains of constant length. If the thread finger meets with any obstruction, a spring 40 permits the link to lengthen. The take-up 77 is connected to its cam-lever by a link 78. The pivot-pin uniting the link to the take-up lever arm is secured in a slot in the lever-arm which is concentric with the pivot connecting the link 78 and the cam-lever when the take-up is at the top of its stroke. By adjusting the pivot-pin in the slot, the lower limit of the take-up is altered while the upper limit remains the same. A hollow steam-heated plate 84 is arranged adjacent to the take-up, and heat is transferred to the take-up by a spring-pressed plunger upon the take-up, the head of which rubs against the plate. The main tension disk 86 is provided with a thread groove by notching the edge of the disk, the notches being inclined to the radial, and bending the parts so separated alternately in opposite directions. The disk is secured to a brake-wheel upon which two brakeshoes press. These shoes are arranged diametrically opposite one another, and are pressed upon the wheel by cam and governor controlled gear similar to that described in Specification 28,740/09. A second tension disk 87, around which the thread passes before reaching the disk 86 is braked by a co-axial friction-disk pressed on to it by a spring. The rotation of the main tension disk is controlled so as to produce a light tension during the loop-drawing stroke of the needle and a heavy tension during the stitch-setting stroke of the take-up. In addition, the tension disk is locked when the take-up reaches the limit of its stroke by a band-brake brought into action by a cam. The tensionrelease mechanism is of an ordinary nature, and is operated by a usual swinging link adapted to be actuated by the main shaft on reversal. Needles, hook, threading-devices for. - The looper is secured to a sleeve 42 having sliding and rocking freedom upon a spindle 43 fixed to the machine frame. The sleeve is rocked by means of a cam-actuated rod 49, and is moved axially by a lever having a roller 46 mounted upon it, which engages in a slot in a thickened portion of the sleeve. The spindle supporting the sleeve is hollow, and steam is led into it to heat the looper. This subject-matter does not appear in the Specification as accepted.