Patent GB-190816682-A (GB)
Title: Improvements in or relating to Automatic Embroidering Machines.
Inventor: KNECHT JOHANN JAKOB
Filed: 1908-08-07
Granted: 1909-01-07
Abstract: 16,682. Knecht, J. J. Aug. 7. Toothed gearing.-A number of spur-wheels are moved as determined by an automatic pattern apparatus into gear with an axially movable worm connected to the frame of an embroidery machine. The movement of the worm is equal to the sum of all the movements which the wheels m gear would have severally imparted, and the parts are so proportioned or arranged that the values of the movements which they can severally impart are in geometrical progression. Fig. 1 shows a construction in which the spur-wheels 21 are movable into gear with a number of curved racks in a frame 24 pivoted at 25 and reciprocated by a mangle-motion 29, 35. The wheels are moved by the forks 22 connected to the pattern apparatus. The wheels are splined to screws 1 ... 8, the top one of which runs through a fixed nut 9 and the rest through nuts 10 ... 16 connected to the ends of the worms next above them. The bottom one is connected to a frame having two racks 19, 20. In this arrangement the rack frame receives the sum of all the motions imparted to the nuts by reason of the rotation of the screws which pass through them. The pitches of the screws are so proportioned that the motions imparted to the nuts during one swing of the frame 24 are in geometrical progression. The pinion 37 is splined to the worm which moves the work frame, and is movable into gear with either the rack 19 or the rack 20 according to the intended direction of movement of the frame. In the construction shown in Fig. 3, the motions are added together by screws to which the gear-wheels 21<a> are splined. The wheels are actuated by a central wheel 43 intermittently rotated by connexion with a star-wheel 48 driven by a crank 39<a> on the driving-shaft 44. In the modification shown in Fig. 6, two shafts 51, 52 are intermittently rotated by a star-wheel gear. Spur-pinions 60 ... 63, 64 ... 67 are splined to these shafts and by means of the forks 87, 88 are movable into gear with the spur-wheels 68 ... 75. These wheels each carry a pair of planet wheels 85, 86, which, with the exception of the first and last wheels 68, 75 engage with teeth on the hub of a wheel 83 on the left hand, and with internal teeth of a wheel 83 on the right hand. The left-hand planet-wheel 79 of the first wheel 68 gears with a stationary wheel 79, and the right-hand planet-wheel of the last wheel 75 gears with internal teeth of a wheel 82 integral with the nut of the embroidery-frame worm 81. The motions imparted to the wheels 68 ... 75 by the pinions are added together and transmitted to the worm. The pitch circles of the wheels 83 are in the ratio 1 : 2, therefore the motion of any wheel is doubled in transmission to the next, and the motions imparted to the worm by the pinions 60 ... 67 taken separately are in geometrical progression. A second gear and similar wheeltrain is mounted in the box 78 beneath the one shown to drive a second worm, which moves the embroidery frame in a direction at right-angles to that of the action of the worm 81. The shafts corresponding to the shafts 51, 52 are geared to the latter worm, and all are driven by a common starwheel. When the pinions are out of gear with the spur-wheels, the latter are locked from rotation by pawls 91, 95. In another construction, double the number of pinions shown in Fig. 6 are provided so that each of the wheels 68 ... 75 may be operated by a pinion on either shaft. Motions imparted from the shafts 51, 52 to wheels denoted by odd and even numbers respectively are then subtracted from the motions imparted from the same shafts 51, 52 to wheels denoted by even and odd numbers respectively.