Patent GB-115040-A (GB)
Title: Improved Automatic Control Mechanism for Embroidering Machines.
Inventor: FAHRNI OTTO
IPC: D05C9/06
Filed: 1918-04-17
Abstract: 115,040. Fahrni, O. April 17, 1917, [Convention date]. Embroidery machines. - In control mechanism for an embroidery machine, the work frame is driven by a rack 44 connected by linksge-gear to a series of cranks of different lengths on shafts 24a - - h, the selective operation of which is deiermined by perforations in a pattern strip on a jacquardcylinder 113. The shafts 24a - - h carry pinions 18 which are oscillated by a rack 13 (reciprocated from the main shaft 1) and are clutched to, or released from, the shafts according to their axial positions thereon, which is determined by the pattern strip. Stitch changing means and drilling, punching and other functions are similarly controlled by the pattern strip, the needles of which are connected to other toothed gearing associated with the shafts 24. Fig. 5 shows the crank linkage for operating the rack 41 which drives the main rack 44 (through a pinion 43) as well as a stop-rack 42 for the frame. The cranks 24a - - h are of such lengths, and are connected by rods 31 and links 32 - - 36, 38, 39 in such a manner that the pivot 40 of the link 39, carrying the rack 41, can be given displacements corresponding to any desired number of sixtieths of a unit (the pitch of the rack 44) up to four complete units. Referring to Fig. 2, the rack 13 operates the pinions 16 and if these are in the proper axial position on the shafts 24, lugs 28 on the pinions engage driving-lugs 30 on the shafts to bring the cranks into their lower (working) position. On the return stroke of the rack, the cranks will be reversed only if the pinions have been axially displaced so that other pairs of lugs on the pinions and shafts are brought into engagement to rotate the shafts in the reverse direction. The axial displacement of the pinions 18, as well as of the stitch-changing pinions 19, 21 and reversing- pinion 20, is selectively effected by devices controlled from the pattern-strip and operated by a blade 106, which is reciprocated from the shaft 1 by the gear 128, 127 on shaft 11, and crank 125. A series of cranleed levers 26, 26' have each one arm engaging a groove in the pinions 18, and similar levers 56, 69, 70 engage the pinions 19, 20, 21. All these levers are mounted on a shaft 71 and their other arms are linked to pairs of plates 104, 105 which are connected to the jacquard-needles 107 and hooked to be engaged by the blade 106 according to the position of the needles. These are normally pressed up to the cylinder 113 by springs 108 against which they are withdrawn, on the return stroke of the blade 106, by a bar 136 (operated by a cam 133 on the shaft 11) engaging the cross-pins 110 of the needles. The pins 110 serve also to prevent rotation of the needles by engagement in the slotted bar 112. The stitchchanging devices are controlled from the shafts 24g, 24h. A sleeve 48, free to slide and rotate on a shaft 47 carries fixed pinions 20, 20<1> and slidable collars 49, 50. The latter are adapted to engage notches in stitch-changing, and reversing- disks 51, 52 and 53, 54 respectively, rotatable on the shafts 24g, 24h. The disks are also formed with facing pinions adapted to mesh with the pinion 20', the arrangement being such that when the pinions on the reversing-disks are so engaged the collar 49 is in locking engagement with the stitch-changing disks, and vice versa, The shafts 24g, 24h carry fixed driving-lugs 57, with which one or other of the pawls 61, 62 and 63, 64 pivoted on the stitch-changing and reversing disks engages. The shafts 24g, 24h are also provided with fixed collars 65, 66 having clutch faces adapted to engage the clutch members 67, 68 of the pinions 19, 21. The axial adjustment of the sleeve 48 is effected by a cranked lever 56 controlled from the pattern-strip. In order to effect the stitch-changing before the working stroke of the rack 13, the needle connected to the sleeve 48 is rearwardly cranked so as to project Leyond the other needles bv one transverse row of holes in the pattern, and its lever 89 (in the linkage between the crank-lever 56 and the arms 104, 105) is reversed as shown in Fig. 2. For effecting the drilling, punching, and other functions, a rack 14 operates pinions 140<a> - - f on the shafts 24a - - f, the pinions being grooved to receive the blocks 138 on rods 137 whose other ends are adapted to be engaged by the lugs 28 of the pinions 18. The pinions 140a, b, c are mounted directly on the corresponding shafts 24 and have lugs 142 to engage lugs 143 on sleeves 144 which embrace the shafts and carry cranks 145 connected to the function-driving mechanism. The pinions 140d, e, f have lugs 146, 147 to engage lugs 148, 149 on sleeves 141<d>, e, f which embrace the corresponding shafts 24 and carry cranks 150 connected to the drilling-mechanism. For adjusting the latter, the cranks 150 are of different lengths (see Fig. 3) and the driving-rod 154 for this function is connected to the cranks by linkage 151, 152, 153 so that the rod 154 is capable of seven different movements. The changing of the drive between the racks 13, 14 is effected by the gear shown in Fig. 11. The connecting-rod 12 (rocked from the shaft 1) is bored to register with the eyes of the racks 13, 14 at each end of the stroke. Pins 160, 161 are adapted to clutch the racks to the rod 12 or to the stationary arms 165, 167 according to the position of a slider which is connected by links 171, 172, 173 to a lever 103 on the shaft 102. A lever 101 fixed on the shaft 102 is connected to the needle at one edge of the jacquard. The racks 41, 42 are caused to operate alternately, through their respective pinions 46-45 and 43, upon the main rack 44 by cams 178, 182, Fig. 4, actuating linkage 177 and 180, 181 connected respectively to slides 174, 175 in slotted links formed on the racks. The rack 41 is arranged to engage its pinion 43 just before the rack 42 leaves its pinion 46. The movements of the frame at right angles to the rack 44 are effected by mechanisms (not shown) similar to those above described actuated from the shaft 11.