Patent GB-210704-A (GB)
Title: Graduating appliances
IPC: B07C5/06
Filed: 1923-07-17
Abstract: 210,704. Marks, E. C. R., (Kimble Glass Co.). July 17, 1923. Dividing-engines.-A machine for graduating glass tubes is provided with means for compensating for inequalities in the bore of the tube, means for marking each tenth graduation completely round the tube and for marking every fifth line longer than the others, and means for automatica.lly stopping the machine when the tube is completely graduated. Means are also provided whereby tapered tubes may be volumetrically graduated. The table 30 of the machine is formed with grooves 32, Fig. 16, accommodating a slide 32, on the upper surface of which is a longitudinal rib 34. Adjustably mounted on the rLb are head and tail stocks 35, 36 which support the ends of the glass tube 37 through which a mandrel 45 is passed. The grooves 32 also accommodate a slide 50 having two independent coaxial rollers 51, 52, the former of which fits between the guide-bars 46. The slides 35, 50 are connected by a rod 54 formed as a rack at its end which gears with a pinion 60 mounted in a block 57 on the rib 34, so that by turning the head 61 the distance between the slides 33, 50 can be adjusted. At the left of the table 30 is a guide 70 pivoted on a bolt 72 the axis of which passes through the centre line of the slides. Mounted on the guide 70 is a slide 74 to which is attached a bar 75 by a pivot 73 which, in the zero or initial position, is co-axial with the rollers 51, 52. The angle between the members 74, 75 can be adjusted by a telescopic device 76, these two members thus forming an adjustable wedge which moves the slides 33, 50 when the slide 74 is traversed along its guide. To vary the speed of the slides 33, 50 in relation to a constant speed of the slide 74 so as to compensate for inequalities in the bore of the tube 37, the bar 75 carries a resilient bar 81 which bears on the roller 52 and can be deformed by means of four adjustable clamps 83 - - 86. The traversing- means for the slide 74 comprise a screw shaft 110 mounted in bearings 111, 112 in the guide 70 adapted to be engaged by a half-nut 121 carried on a slide 114 mounted in grooves in the slide 74 to which it can be secured by one or more pins 135. A bar 115 pivoted at 116 to the slide 114 carries a sleeve 117 having an aperture through which the nut 121 passes. A yoke 118 pivoted at 119 to the bar 115 carries a bar 120 to which the nut 121 is secured, the nut being moved into, or out of, engagement with the shaft by means of a handle 127. The screw 110 is intermittently rotated by a shaft 140 driven by a belt-pulley 143 and carrying an eccentric 144 surrounded by a sleeve 145 pivoted to a yoke 146 which is connected by links &c. 148 - - 156 to a fork 157, Fig. 7, pivoted at 158 and connected by a link 159 to a fork 160 freely pivoted on the bearing 112, the fork carrying a pawl 161 operating a ratchet 162 secured to the shaft 110. To disengage the pawl periodically, e.g. when each tenth graduation is to be marked completely round the tube, a roller 163 on the pawl is adapted to be engaged by an arm 164 freely mounted on a shaft 165, Fig. 1, and connected by a link 168, Fig. 7, to an arm 169 secured to a shaft 170 which carries a torsion spring 173, Fig. 6, normally holding the arm 164 out of engagement with the roller 163 and also carries an arm 174 terminating above a rod 175, Fig. 5, passing through an aperture in the pivot 72. The rod 175 is adapted to be lifted to rotate the shaft 170 by a bell-crank 176 connected by a rod 178 to a bell-crank 179, Fig. 1, carrying a roller 181 engaged by a cam 182 on a gear 183 driven by a gear 184 on the shaft 140, the gear ratio being 1 to 11 and the shaft 140 making two complete revolutions during the marking of each tenth graduation. To stop the machine automatically at the conclusion of the operation the shaft 165 is provided with a number of spirally-disposed pins 188 and a collar 189, these parts being equally spaced at intervals corresponding to fifty graduations on the tube 37. By turning the disc 190, Fig. 7, secured to the shaft, any one of the pins can be brought into longitudinal alignment with a lug 192, Fig. 3, on a spring plunger 193 mounted on a standard 133 secured to the slide 114, so that when the slide is traversed sufficiently for the lug to engage the appropriate pin, or the collar, the shaft 165 is shifted axially and this movement is transmitted by a lever 195, Fig. 7, to the shaft 170. This shaft carries the pivot of a lever 197, Fig. 6, the end of which is fixed in a bracket on the frame 70, so that axial movement of the shaft moves the other end of the lever into a position above the arm 174 and pin 175, and beneath the end of a pivoted arm 200 connected by links 202, 203 to a lever 204, Figs. 9 and 10, pivoted at 205 with slight axial play and having an extension 206 bearing a grooved roller 207. The pulley 143 is coupled to the shaft 140 by a clutch 215 engaged by move. ment to the right of Fig. 9 and connected by a yoke 216 to a shaft 217 carrying a handle 218 and also carrying an arm 219 having a pin-and-slot connection 220 with a bar 221 the end of which is normally engaged by the part 213 of the lever 204. When the link 203 is moved to the left of Fig. 9 by upward movement of the arm 200 the roller 207 is moved into engagement with a rib 214 on the sleeve 145 and the lever 204 is depressed out of engagement with the bar 221 which is then moved by a spring 223 to disengage the clutch. To facilitate preliminary setting of the slide 74 to definite positions, the frame 70 carries a shaft 224, Figs. 1 and 4, with four radial pins 225 - - 228 corresponding to the 100th - - 400th graduations. The shaft carries an arm 229 pivoted to one end of a rod 230 which is pivoted at its other end to a link on the frame. The slide 74 has a projection 232 adapted to engage any one of the pins when the shaft 224 is turned by moving the rod 230. The means for operating the scriber 253, Figs. 11 and 12, comprise a cam. 233 on the shaft 185, Fig. 1, operating a roller on an arm 234 fixed to a shaft 235 carrying arms 236, 237 connected to slides 240, 241 carried on a stationary bearing 242 within which is a rotary sleeve 243 through which the tube 37 passes, the sleeve being rotated by bevel gears 244, 245 from the shaft 140. The slides 240, 241 carry a sleeve 246 having an internal cylindrical surface 248 and cam-surfaces 249, 250, controlling the period of contact of the scriber 253 with the tube. A lever 251 carrying the scriber is pivoted at 252 in the sleeve 243 which also carries a pivoted lever 255, the toe 257 of which engages the lever 251. The lever 255 carries a roller 258 engaging in one of the surfaces 248, 249, 250, so that it moves the scriber away from the tube against the action of a spring 254 when the roller bears on the cam portions of these surfaces. The tube is initially volumetrically graduated into say hundreds of c.c. and the clamps 83 - - 86 are severally adjusted until the scriber registers at the corresponding graduations, the rod 54 being provided with a pointer 400 to assist in such setting. When tapering tubes are to be graduated the rigid connection between the slides 74, 114 is removed and these slides are connected by means which produce a continuously varying speed of the slide 114 in relation to a constant speed of the slide 74.