Patent GB-190903742-A (GB)
Title: Improvements in Machines for Forming Sheets or Bars from Plastic Substances.
Inventor: GREEN THOMAS LUTHER
IPC: A21C11/16
Filed: 1909-02-15
Granted: 1910-01-06
Abstract: 3742. Green, T. L. Feb. 15. Extrusion machines for dough are provided with means for adjusting the die opening ; a removable partition which is introduced into the hopper when two different doughs are used ; means for adjusting the feedrolls ; scrapers adjustable with the rolls ; a carrier adjustable longitudinally and angularly to feed the dough sheet accurately to a companion machine ; flour-dusting means ; and a surfacing-device. The die 50, Fig. 20, comprises two cylindrical bars 47 formed with flat portions 49 which can be turned to vary the opening between them by means of a hand-wheel 54 mounted upon a spindle 53 carrying a pinion 52 engaging with the longer of two intermeshing pinions 51 mounted upon the bars 47. When the spindle 53 is pushed inwards, the pinion 52 engages with both pinions 51 and locks the members 47 in their adjusted positions. When two different doughs are employed, the hopper 1, Fig. 12, is divided by a vertical partition 170. The feed-rolls 4 are carried by shafts 5 mounted in bearings in plates 7 pivoted in bearings 13, and are adjusted by means of handles 18 secured to shafts 15 carrying eccentrics engaging with eccentric straps 16 carried by bars 17. To facilitate removal of the rolls 4 and shafts 15, the bearings are constructed as shown in Fig. 2. Scrapers 42, Fig. 12, rest in grooves in the shafts 12 carrying the members 7 and are held in position by back supports 44. The extruded dough sheet is received upon a carrier belt 60 passing over a support 67 carried by a tilting frame 61, which is angularly adjustable about a shaft 80 by means of slotted bars 110 held by a clamping-sleeve 116. Longitudinal adjustment of the belt is obtained by moving the support 67 relatively to the frame 61 by means of a pinion 113 and racks 112. Links 115<a> depending from the pinion shaft 114 provide additional support for the frame 61. Flour is supplied from dusting-boxes 121, each fitted with a sieve and provided with a projection 126, Fig. 5, operated upon by a hammer 127 carried by a vibrating arm 128 pivoted to an adjustable bar 130, and actuated by a cam 134 and spring 133. The dough is surfaced by means of a U-shaped plate 150, Fig. 12, and brushes 151 resting upon the sheet and carried by a frame 152 vibrated by crank-pins 154 operated from a shaft 165 through bevel-gearing. The brushes 151 are loosely supported so as to rest lightly upon the dough. Motion is imparted to the various parts of the machine from a main shaft 35, which through variable-speed gearing 37 drives a second shaft 33 connected to the rolls 4 by spur gearing. The shaft 165 of the surfacing- device, and the cam operating the flour-dusting device, are both driven from the shaft 35 by belt gearing. Motion is imparted to the belt 60 by means of a drum 73 mounted upon the shaft 80, which is driven from the shaft 35 through a shaft 88, friction gearing 87, 86, and worm gearing 84, 83. The worm-wheel 83 is connected to the shaft 80 through a variable-speed mechanism, Fig. 17, by means of which the shaft 80 may be run at two different speeds or may be stationary ; a key 100 when in its extreme left-hand position couples the shaft 80 directly to the worm-wheel 83 ; in the right-hand position the shaft is driven through gearing 107, 106, 104, 103 ; and in the mid-position the shaft is disconnected. The die plate 50 may be replaced by a die adapted to form bars &c.