Patent GB-191328423-A (GB)
Title: Improvements in Machines for Making Fibre Tubes.
Inventor: MEHLUM CASPER
IPC: B31C1/00
Filed: 1913-12-09
Granted: 1914-12-09
Abstract: 28,423. Mehlum, C. Dec. 26, 1912, [Convention date]. Fibrous pipes and tubes. -In a fibre-tube making machine of the kind having a rack which is gradually raised during the rotation of the mandrel so that, when a predetermined number of revolutions have been made, an adjustable stop on the rack operates mechanism to stop the machine, means are provided whereby the rack is set free to fall back to its original position. An improved collapsible mandrel is also provided. The paper web 2 passes through an acid bath 3, between scrapers 5, under a presser roller 6 (preferably heated) and round the mandrel 7. The scrapers are adjustable individually, and the frame 78 that carries them is adjustable at the connexions 79, 81. The presser roller 6 is carried by a pivoted arm 69, and can be moved away from the mandrel by a link 72 eccentrically pivoted to a shaft 29 which can be rotated by a hand-lever 68. The end of the mandrel shaft 12 remote from the driving- mechanism is supported by a movable semicylindrical bearing formed in a bracket 22, the bracket being mounted to move vertically and swing horizontally on a pin 24. The bracket is supported in its raised position on a cam 28 carried by the shaft 29. When the handle 68 is moved to raise the roller 6 from the mandrel, the bracket 22 is simultaneously lowered, and can be swung clear to allow removal of the finished tube. The roller 6 can be adapted to different sizes of mandrel by an adjustable bearing 70 and holes 76. The mandrel comprises segmental plates, preferably four in number, the meeting edges of which are bevelled to facilitate overriding when being collapsed. Each segment has hinge connexions 9 with bars 11, the bars being supported by links 14 pivoted to bosses on the mandrel shaft. A sleeve 17, slidably carried by the ahaft, has link connexions 15 with the ends of the bars 11, so that relative endlong movement of the sleeve and shaft give expansion or contraction of the mandrel. An operating-handle 34 is pivoted to a pinion 30 on the sleeve 17, and is connected to the shaft by a link 35. In the expanded position, the arm 34 is held by a spring catch in a slotted projection 36 on the pinion 30. The machine is driven by a belt 38, fast pulley 37, shaft 32, and pinion 31 engaging the pinion 30. A belt-shifting fork 40 carried by a slidable bar 41 tends to throw the belt on to a loose pulley 39 by the action of a spring 64, but is held during the winding operation by a projection 63 on the bar 41 engaging one arm 62 of a three-armed lever pivoted at 58. A worm 44 on the sleeve 17 drives a shaft 46, on which is a loose pinion 49 engaging the rackbar 52. The pinion is driven through a clutch 50 normally held in engagement by a spring 51. As the mandrel rotates, the pinion 49 raises the rack 52 until the adjustable stop 55 strikes a counterweighted arm 56 of the three-armed lever. This moves the arm 62 clear of the projection 63, allowing the spring 64 to throw the belt on to the loose pulley 39. A cam-surface on the projection 63 gives the arm 62 an additional movement, thus causing the third arm 59 of the lever to strike a projection 60 on a forked lever 61 engaging a groove in one of the clutch members. The pinion 49 is thus freed, allowing the rack 52 to fall to the starting position.