Patent GB-191325268-A (GB)
Title: Improvements in Means for Automatically Regulating the Feeding of Stock to a Paper Making Machine.
Inventor: FRENCH TOM
IPC: D21F1/00
Filed: 1913-11-05
Granted: 1914-06-18
Abstract: 25,268. French, T. Nov. 5. Thickness of paper , regulating and gauging.- In apparatus for controlling the thickness and weight of paper during the process of manufacture, the stock gate 62, Fig. 2, is raised and lowered according to the thickness of paper passing between press or other rolls 10, 12, Fig. 1. The upper roll 12 is mounted in yielding arms 16, 17 and carries a ball 22 on which rests a lever 26, one end of which is attached to a diaphragm 30 resting on mercury or other liquid 33, while the other end supports a diaphragm 36 by means of a ball 34. The chamber above the diaphragm 36 is also filled with a liquid, such as mercury, and an upwardlyextending tube connexion is also filled with liquid. A ball 44 is connected by a rod 46 to a pivoted beam 48 having contact-members 50, 51 adapted to dip into cups of mercury 54, 55. A blade or vane 56 in a cup of mercury 58 exerts a damping-action on the movements of the beam 48. When the paper is too thin, contact is made at 51 by the slight fall of the diaphragm 36, an electric circuit is completed, and an electro-magnet 71 attracts an armature 72, the movement of which causes a pawl 93 on a reciprocating yoke 90, Fig. 2, to engage a ratchet-wheel 96, which raises the stock gate 62 through gear-wheels 100, 66. If the paper is too thick, contact is made at 50 and, by similar means, the pawl 92 on the yoke 90 rotates the ratchet wheel 96, and the stock gate is thus lowered. The electric circuit includes a timing-device 126 mounted on the shaft 122 and carrying cam-surfaces 152, 153, which periodically press a spring contactpiece 138 against an adjustable contact-piece 140. To prevent the stcck gate 62 from being operated excessively when the paper fails or becomes broken, a switch 134, which is normally closed, is caused to open by an electro-magnet 184 when the electric circuit of a battery 180 is completed by the contact of a pivoted lever 170 in the circuit with a cupshaped member 176, which may contain mercury, and into which the lever falls when the paper web fails or breaks. This circuit also includes a timing- member 124, also mounted on the shaft 122, and carrying plugs 192 which engage spring contacts 188, 189 just ahead of the engagement of the contact 138 by cams 152, 153, so that when the paper fails, the magnets 70, 71 are rendered inoperative. Fig. 6 shows an arrangement in which the diaphragm 241 is connected to a U-tube, the diaphragm being filled with oil, as is also the tube 244, while the bent part contains mercury 246. The raising of the diaphragm causes the mercury to cover a contact-wire 264 sealed in the glass, and so bridges the gap between it and a contactwire 262 and brings into operation the electromagnet 70. Lowering of the diaphragm causes the mercury to connect the points 252, 262 and bring into operation the electro-magnet 71, while excessive falling of the diaphragm due to failure of the paper uncovers the contact-point 262 and so prevents excessive motion of the stock gate. Fig. 7 shows a similar arrangement, but with the switch 134 included in the circuit. When the paper fails, a lever 302 falls into a cup-shaped member 303, and when the mercury in the tube rises to the contact-wire 300, a circuit is completed which energizes the magnet 184 and operates the switch 134 to break the circuit. A bulb or catch receptacle 45 for the liquid is formed at the top of the tube 272, and a similar bulb may be provided for the tubes described in the other arrangements. In the arrangement shown in Fig. 8, the rising of the diaphragm causes the mercury in a tube 208 to make contact with a rod 212. The fall of the diaphragm brings a rod 226 into contact with mercury 228, and excessive falling due to failure of paper brings the rod 220 into contact with the mercury 222, which controls the circuit through the magnet 184.