Patent GB-1249169-A (GB)
Title: Wrapping machine
Inventor: VILEN ERIC OLAV
IPC: B65B11/20
Filed: 1969-07-07
Abstract: 1,249,169. Wrapping machines/conveyers. TRIANGLE PACKAGE MACHINERY CO. 7 July, 1969, No. 34230/69. Headings B8A and B8C.  A wrapping machine comprises a pusher 8 which pushes a package P from a platform 27 against a web of wrapping material W and on to a lowering table W so that the leading edge of the web is positioned beneath the package, a folder bar 158 which is lowered to grip the web against a gripper bar 147 positioned below the table 69 and thus fold the web over the package, an out feed pusher 97 which after lowering of the table 69 pushes the package on to a receiving table 201 to position the now leading edge under the package, and a clamping blade 172 which on lowering of the table 69 clamps the material over a fixed knife edge 75 to sever the wrapping material. As the package P is pushed on to the table 69 a pair of tuckers 96 tuck the leading sides of the web along each side of the package P, and a pair of downfolder arms 199 move downwardly and fold the sides of the web against the package. When the package P is pushed on to the receiving table 201 further tuckers 204 tuck the now leading package sides against the package, and supports 205 raise the package to cause partial folding of the wrapper against the sides of the package. An endless chain 213 carrying pusher 217 is then raised to carry the package to a conveyer belt 276 for transfer to a heat sealing station 4. During transfer by the pushers 217 the wrapper is folded downwardly and under the package by plows 207 which comprise vertical legs 208 and horizontal legs 209. Heat sealing station (Figs. 11, 27).-The package is urged against heated ribbed plates 294, 295 by springs 316. Heat shrinking station.-After sealing the package is moved to a heat shrink tunnel 3. After shrinking the wrapped package is weighed at a station 4 and then labelled at a station 5. Conveying package through the machine.-An infeed conveyer 6 (Fig. 2) has a stationary belt 12 and pusher bars 13 which square up the package and convey the package to a cross feed pusher 7 which places the package in front of the pusher 8. The wrapped and labelled package is deposited on a shelf 9 from which it is manually moved to a lower shelf or conveyer 10. A shelf or conveyer 11 may be provided for packages prior to placement on the infeed conveyer 6. Drive for the machine.-The machine is driven by an electric motor 25 and a drive shaft 24 (Fig. 11) on which a plurality of cams and sprockets adapted to drive levers and chains to operate all the moving parts of the machine are arranged (Fig. 29, not shown). Feeding wrapping material.-The web is fed from a roll by a mechanism permitting a roll 231, 232 or 233 of appropriate width to be selected. This mechanism is claimed in Specification 1,249,170. Adjustment.-The tuckers 196, 204 and folders 199, 208 are adjustable for packages of varying widths. The gripper bar 147 is coupled to the outfeed pusher 97 so that the longer the package the lower this bar is disposed to enable more wrapping material to be provided. Mechanisms are provided to prevent the package P from moving during lowering of the table 69 and to prevent the infeed pusher 8 from moving against the web when a package P is absent.