Patent GB-1179995-A (GB)
Title: A Method of and Machine for Sewing Together Net Sheets.
Inventor: PAJULAID MANIVALD MAXIMOVICH
IPC: D04G1/00
Filed: 1968-11-26
Abstract: 1,179,995. Sewing. TALUNSKY FILIAL TSENTRALNOGO PROEKTNO-KONSTRUKTORSKOGO I TEKH-NOLOGCHESKOGO BJURO GLAVNOGO UPRAVLENIA RYBNOI PROMYSH-LENNOSTI ZAPADNOGO BASSEINA. 26 Nov., 1968, No. 55977/68. Heading DIG. Nets are sewn together manually by pulling loops 3 of thread 1 from a shuttle 2 through successive contiguous meshes 4, and passing the shuttle successively through said loops. A machine for effecting such sewing comprises a main shaft 12 driven by a motor 143 via a belt 144 and gearing 145 to 148, carrying cam drums 24, 30, 44, and rotating a shuttle 6 via gearing 10, 11. A needle bar 34, carrying a hooked latch needle 31, is reciprocated via a linkage co-operating with a cam groove in drum 44. A hook 14 is rigid with a shaft 15 which is journalled in one end of an arm 25 and is oscillated via a linkage co-operating with a cam groove in drum 24, while arm 25 is oscillated via a linkage co-operating with a cam groove in drum 30, the arrangement being such that hook 14 pulls a length of thread from the shuttle bobbin 7 and lays the thread in the hook of the ascended needle, which, on descent, draws a loop 3 through a pair of superimposed meshes 4. Loop 3 is then spread by a projection (46) on an arm 45 rigid with a shaft 49 journalled in a bearing 48, shaft 49 being oscillated and bearing 48 being reciprocated via respective linkages co-operating with respective cam grooves in drum 30. The arrangement is such that the beak of shuttle 6 enters the expanded loop, while on upward movement of the needle a projection (47) on arm 45 removes the thread from the needle hook. The completed stitch is tightened by a hook 66 rigid with a shaft 67 oscillated via a linkage co-operating with a cam groove in drum 44. Work feeding and holding. The superimposed meshes 4 are engaged by respective work-feeding pins 79 upstanding from a plate 78 carried by a bracket 80 to which horizontal and vertical reciprocating movements are imparted. Bracket 80 is slidable on a horizontal rod 81 and is connected by a link 82 to a swinging arm 83 connected by a link 85 to an arm 86 on one end of a rock shaft 87 having at its other end an arm 88 carrying a pin 89 co-operating with a cam groove 90 in drum 24, for reciprocating bracket 80 horizontally. The end positions of link 85 are adjustable by means of respective screws 91, 92 for varying the feed stroke of bracket 80. Rod 81 is carried by a frame 93 rigid with vertical rods 94, 95 slidable in fixed bearings. Frame 93 pivotally carries blocks 97 slidable in recesses 98 in respective 99, 100 rigid with a rock shaft 101. An arm 102 on the latter is connected by a link 103 to one end of a lever 104 fulcrumed intermediately on a pin 105 and carrying at its other end a pin 107 co-operating with a cam groove 108 in drum 44 for reciprocating bracket 80 vertically. The meshes 4 are also engaged by respective pins depending from a bracket 76 rigid with a vertical rod 109 pivotally carrying a block 111 slidable in a recess 112 in a downwardly-spring biased arm 113 at one end of a rock shaft 114 having at its other end an arm 115 pivotally carrying a block 117 slidable in a recess 118 at the upper end of a link 119 pivoted at its lower end to bar 99, for imparting vertical reciprocation to bracket 76. A bracket 77, having a horizontal portion bearing downwardly bn the meshes 4 and formed with a slot 120 for the passage of the lower and upper pins, is rigid with a vertical rod 121 pivotally carrying a block 122 slidable in a recess at one end of one end of a downwardly-spring biased arm 123 at one end of a rock shaft 124 having at its other end an arm 125 pivotally carrying a block slidable in a recess 127 at the upper end of a link 128 pivoted at its lower end to bar 100, for imparting vertical reciprocation to bracket 77. Fulcrum pin 105 is carried by an arm 106 on a rock shaft 129 carrying a two-armed lever 130, one end of which is biased by a spring 131 to engage a follower roller 133 on the other end with a selected one of a plurality of pattern cams 134 splined to a shaft 135 and axially shiftable thereon by means of a handle 136. Shaft 135 is coupled by gears 137, 138 to a Geneva wheel 140 co-operating with a pin 142 on a crank arm 141 rigid with shaft 12 for imparting intermittent rotation to shaft 135. The cams 134 are adapted to shift pin 105 periodically for retaining bracket 80 in its lowered position to prevent work feeding, whereby two or more stitches are formed at individual positions at required spaced distances apart.