Patent GB-226870-A (GB)
Title: Improvements in and connected with machines for making paper bags
IPC: B31B3/34
Filed: 1923-09-26
Abstract: 226,870. M³ller, J. C. [Firm of], and Halank, G. F. Sept. 26, 1923. Paper bags, making.- A machine for making bags from a single web 4 of cardboard or stiff paper comprises a mandrel 24 lying along the longitudinal axis of the paper web and having a clamping device 41, which secures a free edge of the severed web while the mandrel is rotated, after which a presser-arm holds a gummed edge of the web against the body of the bag. The mandrel is then moved longitudinally into a casing 84, where hinged flaps 85 fold in the sides of the projecting end of the bag, before being pressed into the sides of the casing. A slide 89 folds the projecting tabs thus formed on to the bottom of the bag, which is then advanced with the mandrel through an aperture 95 in the slide 89, hooks' (not. shown) engaging the open end of the bag to strip it from the mandrel as the mandrel is withdrawn. The bag may then be brought to a vertical position on a table, where it is filled, after which the open end of the bag may be closed by means similar to the casing 84 and hinges 85. Feeding and severing web. The web is drawn from a roll 3 over pulleys 5 and a gumming roller 7 by means of a sleeve 11, rotatably mounted on a drum 9, engagement between the drum 9 and sleeve 11 being effected by means of a ball 12 and an inclined surface 13 in one direction of rotation of the drum 9, which is driven by a crank 15 and connecting-rod 14 from a disc 16, a pin-and-slot adjustment being provided between the rod 14 and disc 16. An insert web 23 may be secured to the web 4, a pressure roller 20 being employed to unite the two webs. The end of the web is fed on to a horizontal table and after one edge has been secured to the mandrel 24, the web is severed by a knife 47 driven by an eccentric 52 on the shaft 53, which also carries the disc 16. The shaft 53 is driven from the main shaft 19 by bevels 18. Forming body of bag. The mandrel 24 is carried by a shaft 25, which is capable of longitudinal movement through a connection with a cam 30 and also of rotary movement through a clutch 36. The mandrel 24 is provided with a key 37 capable of a longitudinal movement on the shaft 25, wedges on the key 37 engaging members 41 pivoted in transverse slots 40 in the mandrel to grip the free edge of the web in a longitudinal slot in the mandrel. The key 37 is operated by engagement with a lug 27 on the movement of the mandrel into its first position. A cam 46 operates a lug 27<a> to release the key 37 after the completion of the bag. The mandrel is rotated by means of a clutch member 61 which is brought into engagement with a second clutch member 36 secured to the shaft 25 by means of a fork 63 actuated by a cam on a shaft 57 driven from the main shaft 19. A gear 58 on the shaft 57 engages a gear 59 secured to the clutch 61. When the paper is wound round the mandrel, a presser-foot 70 on an arm 71 is moved upwardly by means of an eccentric 76 on the shaft 57 to fold the gummed edge of the paper against the body of the bag, and the foot is then held against the mandrel by the spring 72, until it is released by the projection 77 on a cam 82 on the shaft 57 engaging a projection 78 formed on one end of a rod 79. The foot 70 is held out of engagement until the rotation of the cam 82 permits its return. Folding end of bag. A shaft 31 parallel to the shaft 25 is driven intermittently through gears 68, 69 by the engagement of the clutch 66, which is connected to the continuously rotating clutch 61. A groove 32 in a cam 30 carried by the shaft 31 serves both to bring the clutch 36 into engagement with the clutch 61 to rotate the mandrel 24 and to move the mandrel 24 longitudinally into its various operative positions. On the completion of the folding of the paper round the mandrel, the mandrel is moved into the casing 84, where the end-folding takes place by means of the flaps 85 and the slide 89, prior to removal of the bag from the mandrel.