Patent GB-386734-A (GB)
Title: Improvements in machines for folding sheet materials in wrappers or envelopes
IPC: B31B160/10
Filed: 1931-10-15
Abstract: 386,734. Wrapping- machines. CLARE, H., 11, Zimmerweg, Berne, Switzerland. Oct. 15, 1931, No. 28672. Convention date, June 27, 1931. [Class 94 (i).] Sheets or letters, after preliminary folding, are again folded with a wrapper or envelope which is secured by adhesive and by embossing the edges to prevent unauthorised opening. The sheet, Fig. 2, and the envelope blank, Fig. 1, are folded about lines 2, 1, so that when the enclosure is complete an address 6 on the sheet registers with a transparent portion 5 of the envelope. Appropriate parts of the wrapper may be gummed and subsequently rendered adhesive by water; alternatively, the adhesive may be applied at a later stage. The sheets slide down a slope 16, Fig. 6, and over a roller 18 until arrested by a bar 19. A roller 17 is moved into engagement with the roller 18 and the bar 19 is swung into a horizontal position so that the sheet is fed forward between positioning members 38, 40, 42, Fig. 5. A plate 34 rises from a recess in the table 33 and turns over through 180‹, as shown in Fig. 11, forming the first fold about the line 2. During this operation, the folding is assisted by blades 43, Fig. 5, which move into the positions shown in broken lines to define the fold on the line 2, Fig. 2. The material x to form the envelope or wrapper is drawn from a roll 15 by a feed roll 58 and drum 59, and passes round the drum 59 into guides 66. The leading end passes over a feed roller 55 and beneath the forwardly extending portion of the preliminarily folded letter sheet y. The gummed edges of the wrapper are moistened by roller 64. The relative position is now as shown diagrammatically in Fig. 28. A length is severed from the web by a serrated blade 67 mounted in the drum 59, movable radially outwards, during a pause in the intermittent feed, into a recess 72 in a counter-roller 65. The blade is actuated by levers 70 and is retracted to its inoperative position by springs 68. The roller 57 now co-operates with the feed roller 55 to execute combined folding and feeding movements whereby the wrapper and letter sheet are first folded together as shown in Fig. 29, and the partially formed packet is fed into a holder 76, 85 for further treatment. The roller 57 moves first from the position 57<1> shown in broken lines in Fig. 11 to the upper position to form the fold. The previously mentioned severance of the web takes place at this moment, and the rollers 55, 57 both move so as to feed the packet into the holder 75, 86 which is then in the upper position 76<1> shown in broken lines. The flap x<1>, Fig. 29, of the wrapper passes over a moistened part of the roller 55, so that an adhesive flap projects rearwardly from the holder. The holder now turns into the horizontal position shown in full lines, the flap being turned upwards by a roller 22. A blade 86 is now actuated by a lever 91 to thrust the packet between rollers 21, 22 which close the flap down on the packet. The roller 21 is adapted to print upon the edges of the wrapper while securing them, so that fraudulent opening can be detected. A modified form of turning plate is described with reference to Figs. 18 and 19 (not shown).