Patent GB-493351-A (GB)
Title: Improvements in or relating to wrapping machines for wrapping cartons
IPC: B65B11/42
Filed: 1937-03-06
Abstract: 493,351. Wrapping-machines. ROSE, A. G., and ROSE BROS. (GAINSBOROUGH), Ltd. March 6, 1937, No. 6708. [Class 94 (i)] In a machine for wrapping cartons, packets, &c. in a series of steps, the articles are carried from one position to another by means of a packet-wheel having rotatable holders, the articles being inserted in and removed from the holders in the same direction relatively thereto. The wrapping is thus tightened around the article by the friction between the wrapping and the holder. The progress of an article through the machine is indicated in Figs. 1, 2, the successive wrapping and folding operations taking place at positions P1-6. The wrapping material employed is preferably moisture-proof waxed paper which is rendered adhesive by the application of heat. The articles to be wrapped are fed transversely on a belt conveyer 13 to position P1 and each article in turn is advanced between guide plates 11, 12 to the packet-wheel by a ram 14 which is reciprocated through a link 33 by means of a cam 34, the forward stroke being effected through a spring connection 219 to avoid jamming. A catch which normally holds the ram in the retracted position is withdrawn when an article occupies position P1. Wrapping material 2 is fed downwardly between vertical guides in front of the guide plates 11, 12 and a length is severed by a knife 15 and is wrapped around three sides of the article as the latter advances. The packet-wheel comprises an arm 17 which is rotated in steps of 180‹ from a rotating arm 45 having rollers co-operating with a Geneva wheel 41 and which carries at its ends pivoted holders 51, 52 having trailing arms 49, 50 terminating in rollers 61, 62 in engagement with a circular cam track 66, so arranged that the holders turn through 90‹ in passing from the receiving position P2 to the ejecting position P3 and through 270‹ in passing from P3 to P2. Each holder comprises a lower plate 53 and a pair of spring-pressed upper plates 54, 55, and carries at its ends pivoted levers 69, 70 which support a folding rod 67. As the holder arrives at the position P3, a roller 77 on the lever 70 falls into a depression in a fixed cam 75 and swings the rod 67 inwardly to fold down one trailing portion c of the wrapper. The rod 67 is withdrawn -rapidly as the roller 77 is struck by an arm 79 controlled by a cam 82. The other trailing portion d of the wrapper is folded down by a plate 83 which moves in obliquely and presses the packet against a platform 84, both then being moved downwardly to remove the packet from the holder to a position P4. The plate 83 is carried by a transverse member 86 supported by vertical links 87, 88 which are reciprocated by means of a cam, the downward movement being effected through a spring connection 203 to avoid jamming. The platform 84 is mounted on a rod 97 which is moved vertically in synchronism with the links 87, 88. The end tucks e, a are formed during this movement by pairs of folders 117, 118 and 143, 144 mounted respectively on the plate 83 and platform 84, the former pair being moved inwardly by the downward movement of a sleeve 121 relatively to the plate 83 due to the engagement of a roller 141 with a cam surface 142 and the latter pair being moved inwardly by the engagement of rollers 150, 151 with cam surfaces 152, 153. The packet is delivered horizontally to a pair of parallel belts 22 passing over vertical rollers by a ram comprising a pair of plates 156 which reciprocate along guide shafts 162 under cam control. During the movement to position P5, the end flaps h are folded down by plates 178 which are swung inwardly by the engagement of rollers 187 with cam tracks 189. As the packet is received between the delivery belts, the final flaps f, g are folded down, and the closure is sealed as the packet advances by means of vertical and horizontal heating rollers, which may be of convex form. A hand wheel may be provided for operating the machine slowly when a new length of wrapping material is introduced.