Patent GB-988601-A (GB)
Title: Improvements in or relating to apparatus for feeding lengths of web
Inventor: GILES WILLIAM HUDSON
IPC: B65H19/18
Filed: 1962-06-14
Abstract: 988,601. Feeding webs. NU ROLL CORPORATION. June 14, 1962, No. 22989/62. Heading B6B. Web splicing apparatus, Figs. 1 and 5, comprises a pair of main nip rollers 30, 31 driven by the running web 65 and two identical sets of secondary nip rollers 42, 55 and 41, 60. The rollers of each secondary set intermesh when there is no web between them, thereby acting as detectors. The leading end of a reserve web 75 is prepared with an adhesive strip 101, and by lifting the roller 60 mounted on a spring- biased bell-crank lever 37, 38, it is placed between the nip of the secondary rollers 41, 60 and over a flat supporting bar 96. A pair of levers 91, Fig. 5, with transverse extensions 93, spring-biased away from the bar 96, co-operate with the shaft 61 of the roller 60 when the roller is lifted so that the extensions 93 register the web 75 on the bar 96. When the trailing end of the running web 65 passes the rollers 42, 55, they intermesh, turning the bell-crank lever 39, 40 in a clockwise direction, Fig. 5. An intermediate roller 73 mounted on the bell-crank lever 39, 40 and in permament contact with the primary roller 30, contacts roller 41 which is rotated thereby. The leading end of the web 75 is then fed into the nip of the main rollers 30, 31 forming a splice to the trailing end of the exhausted web 65 with the adhesive strip 101. The ends of the webs may be in abutting relationship or overlapping depending on the position of the leading end of the web 75 on the bar 96. In a second embodiment, Fig. 17, the ends of the webs are not spliced with an adhesive strip, but are fed forward in abutting relationship. The main nip rollers 118, 119 are driven in synchronism with a pair of feed rollers 110, 111, by a chain and sprocket mechanism 114, 115 and 116. The operation is similar to that of the first embodiment, Figs. 1 and 5. Guide strips 150, 151 are provided to feed the leading and trailing edges of the webs in abutting relationship from the main rollers to the feed rollers 110, 111. In a third embodiment, Fig. 23, the main nip rollers 161, 162 are driven by a chain-andsprocket mechanism from the feed rollers of the machine being fed, and strip guides 205, 206 are provided since the leading edge of the reserve web is fed in abutting relationship with the trailing edge of the exhausted web. The bellcrank levers are dispensed with and replaced by levers 170, 170<SP>1</SP> carrying intermediate drive rollers 173, 173<SP>1</SP> and operated by solenoids 192, 192<SP>1</SP>. Actuation of each solenoid is by a switch 191, 191<SP>1</SP> operated by a feeler 190, 190<SP>1</SP> which rests on the web, and when the web has expired, moves into the spaces or grooves of the roller 185, 185<SP>1</SP> forming the upper roller of a set of secondary nip rollers. The leading edge of the reserve web is placed between the nip of the secondary rollers by lifting the top roller 185, 185<SP>1</SP> which tilts about a point 182, 182<SP>1</SP> on the frame of the apparatus. Registration is by gauges 200, 200<SP>1</SP> on a frame member 201 of the apparatus.