Patent GB-809645-A (GB)
Title: Sewing machine
IPC: D05B27/18
Filed: 1956-12-11
Abstract: 809,645. Sewing machines. SINGER MANUFACTURING CO. Dec. 11, 1956 [Dec. 19, 1955], No. 37789/56. Class 112 [Also in Group XXV] Overhead cup-feed sewing machines. A sewing machine of the hosiery seamer type in which the work is fed past the stitching mechanism by cup-type feed wheels has a standard formed by four planar sides comprising two pairs of adjacent substantially identical sides, a bracket-arm carried by the standard which extends from adjacent to the intersection of a first pair of sides outwardly across the second pair of sides, and internal mechanism including a main machine shaft journalled for rotation longitudinally of the standard which is itself driven by a power input shaft also journalled for rotation in the casing. The sides of the first pair have apertures to provide access to the interior of the casing which are closed by cover plates. Stitch-forming devices; frames, driving. The casing or frame 1, Figs. 2 and 4, carrying a bracket arm 3 is quadrangular in cross section and is formed by two short sides 9, 10 and two long sides 11, 12. The bracket arm 3 projects laterally from the angle at the intersection of the long sides 11, 12 outwardly across the angle at the intersection of the short sides 9, 10. The long sides have oepnings covered by plates 13, 14 to provide access to the internal mechanism. A threaded plug 15 is provided in the plate 14 to provide access for adjustment of the feed eccentric 117. A top-cover plate 18 for closing the belt compartment 8 of the bracket arm 3 is resiliently held in position by a screw 21 threaded into a stud 22. A spring 19 is located between the head of the screw 21 and a recess 20 in the cover plate. A main machine shaft 24 is journalled in bearings 25, 26 in the casing 1. The shaft is held against vertical movement by a collar 32 and the hub of a gear 33 which about against the upper and lower ends of the lower bearing 26. At its upper end the shaft 24 carries a hand wheel 29. The shaft 24 is driven from the shaft 37 through bevel gears 33, 36. The shaft 37 is driven by a pulley 46 enclosed in a compartment 45 formed by partitions 42, 44 and a curved plate 49. The plate 49 is held in position by four spring metal clips 50, Fig. 9, comprising a sheet metal part 51 having a rounded end 52 adjustably secured to the plate by a screw 53. A stop to position the plate 49 is formed by angle brackets 55. A needle-bar 56 is reciprocated by a pitman 61 connected to a crank 63 on the main shaft 24. A thread carrying looper 64 is adjustably secured to a clamp 65 by a screw 64a which extends through a slot in the shank of the looper. The clamp 65 is mounted on a looper shaft 67 which is oscillated by a crank 73 connected by a pitman 74 to an eccentric 75 on the shaft 24. The shaft 67 is located axially by a collar 71 and the hub of the crank 72. To facilitate adjustment of the looper 64 axially of and circularly about the shaft 67, a sleeve or collar 76 is releasably attached to the shaft by a set screw 77 to act as a marker to gauge the adjustment. A second threaded looper 80 is adjustably secured to a clamp 82 mounted on a shaft 83. The shaft 83 is oscillated by a crank 87 actuated by a pitman 89 connected to an eccentric 90 and is located axially by a collar 86 and the hub of the crank 87. A collar 91 is provided to facilitate adjustment of the looper 80. A countweight 155, Figs. 2 and 10 is secured to the main shaft 24. The counterweight is divided longitudinally into two equal parts secured together by screws 159. Each part comprises a part of the hub 156, arm 157 and counterweight 159. The depth of the portion of the aperture in each part is less than half the diameter of the shaft so that when the screws are tightened, the two initially contact at the line 160 and then pivot about this line. Feed. The work is held and fed between two cup wheels 104, 105 on vertical shafts 121, 106 respectively which are driven from a shaft 110 actuated from the shaft 37 by an adjustable eccentric 117, pitman 116 and one-way clutch 114. Shaft 106 is journalled in the frame 2 at the inter-section of the short sides 9, 10 and driven by gearing from the lower end of shaft 110. The upper shaft 121, enclosed in a tube 128, is driven by a belt from the upper end of the shaft 110. The tube 128, which forms a bearing for the shaft 121, is clamped into a lever 130 by a screw 131. The lever is pivotally mounted in the bracket arm 3 by trunnious and has an arm 134 which is biased upwardly by a spring 135 to pivot the cup 104 into engagement with the cup 105. The loading of the spring is adjustable by a disc 139 which is rotatable by a square rod 140, access to which may be obtained by removing the cover 8. At its free end the lever 134 is connected to a pull rod 143 through a spring 145. The pull rod is enclosed in a sleeve 147 mounted in a plug 148 secured to the lower plate 6. Lubrication. The frame 1 has splash lubrication compartment 4 formed by a partition 5 and the base plate 6. Lubricant is fed into the compartment 4 through the stud 21. A sight gauge is provided to determine the level of lubricant in the compartment together with a drain plug 16. The lubricant is dispensed by an oil sling 161 comprising a disc 162 with an inturned periphery 164 perforated at 167. Specifications 611,837, 809,646 [Group XXXIV], 809,647 and 809,648 are referred to.