Patent GB-190804851-A (GB)
Title: Improved Machine for Sewing Driving Belts.
Filed: 1908-03-03
Granted: 1908-08-20
Abstract: 4851. Maschinenfabrik Moenus Akt. - Ges. March 26, 1907, [date applied for under Section 91 of Patents &c. Act, 1907]. Running-stitch machines ; belting - sewing machines; leather - sewing machines.-In a machine for sewing driving-belts in which a double-pointed needle is gripped by reciprocating needleholders, the thread is passed in a zigzag line through the work, and the tension on the thread is kept constant, a reversing - mechanism for needle-holders being provided which is made dependent on the fixed maximum tension. Needle-driving; needleholders; governing needle thread. - A pulley 4, Fig. 1, on the main shaft drives a shaft 5 through reversible gearing, the motion being transmitted through a bevel-wheel 6 to wheels 11, 12, shafts 9, 10, and wheels 13, 14, 15, 16 to screw spindles 2, 3, which are of steep pitch and carry similar slide blocks 17, 18. A bolt 20, Figs. 2 and 5, carrying a cross-head 21 in which the needle 19 is mounted, is held up by a spring 38, and the needle is held in the block by the nose 24, Fig. 8, of a hollow bolt 23 held by a spring 22. The hollow bolt carries a spindle 25 guided by a pin and slot 53, 54 and having a slotted head 26 carrying a roller 37. The slide block also carries a lever 27 connected by a rod 28 to the cross-head 21, and at its other end to a pivoted lever 30 held against a stop 32 by a spring 31. The end of the lever 30 enters the slot of the pin 25. Attached to the frame in a position to be engaged by the roller 37 when the pin 25 is in its backward position is a spring plate 34, Fig. 6, held against a stop 35 by a spring 33, but adapted, when depressed by a roller 37, to form with the rib 36, a plane the upper part of which is inclined. Another bent lever 39 is also pivoted to the slide block, and has one arm engaged by a pin 40 on the bolt 20, the other arm having a pivoted spring-held extension 41 to which is linked a pawl 44 adapted to engage a rack 45. As the needle passes through the work from below, it is gripped by the upper carrier and released by the lower one. The upper carrier then rises with the needle until the tension of the thread acting against the spring 38 pulls down the slide 20 and thus causes the lever 44 to engage the rack 45. The carrier continues its upward movement and causes the rack 45 to rise and reverse the driving-gear through the levers 47, 48 and the reversing-gear. The pull of the thread also causes the lever 27 to pull the pin 25 out until the pin 53 reaches the end of the slot 54. As the carrier arrives at its lowest position, the engagement of the roller with the surface 55 causes the withdrawal of the nose 24, and the needle is thus freed as it passes through the work and is gripped by the lower carrier, which then performs a similar series of operations. The bolt 23 is pulled back by its spring, and the pin 25 is returned by the engagement of the roller 37 with the underside of the surface 34. The spring 31 on the lever 27 prevents variations of tension from effecting the parts. To prevent reversal when the needle is being pulled through the work, a sliding piece 60 held by a spring 59 in the slot 61 is provided, and the roller 62 which it carries runs on a ledge 63 as the needle nears the centre, the piece 60 being thereby drawn into a slot in the bolt 20. Work-supports; feed; presser-feet.- The worksupport 66 is journaled on a pedestal and tipped from one side to the other by connexions 71, 72 and gear-wheels engaging with a disk 75 carrying rollers 76, which are adapted to be engaged by a pawl 77, attached to the lower slide block 18, when the slide block rises. A pawl 79, which may be adjustable in length, is attached to the work-support and rotates the feed-roller 67 when the table is tipped. An upper roller 68 presses on the upper surface of the work and may be raised or lowered oy turning a slotted disk 81. An adjustable spring presser 82 holds the work on the support. Multiple-needle machines.-A number of needles may be placed in a row close to one another, and under certain conditions, the machine may be used simply for making inclined perforations.