Patent GB-409857-A (GB)
Title: Improvements in and relating to the production of multiple letter sheets or like forms and apparatus to be employed in connection therewith
IPC: B42C9/00
Filed: 1933-02-01
Abstract: 409,857. Bookbinding. HALLEY, J., 82, Beeches Road, HALLEY, J. M., Creag Mhor, Charlemont Avenue, both in West Bromwich, and HALLEY, A. M., 159, Knightlow Road, Harborne, Birmingham. Feb. 1, 1933, No. 3059. [Class 16.] In the production of units or sets of lettersheets or like forms, of the kind wherein a marginal part of each sheet below the top sheet comprising a set is adhesively attached to the top sheet, the sheets are arranged so that the marginal top edge of each sheet below the second sheet in a set is, when the sheets are assembled, exposed to the inner face of the top sheet, and a pile of such assembled sets of sheets are stacked on the bed of a gumming - machine and manipulated so that the sheets of each set to which gum is to be applied come simultaneously under the action of the machine and are gummed by a single operation thereof. All the sheets in each set, except the top sheet, are staggered as shown in Fig. 1, and the top sheet a is adapted to be pressed over and adhered to each underlying sheet. The machine for gumming the sheets is a modification of that described in Specification 1499/10, [Class 16], wherein a vertically-reciprocating bar receives adhesive from a roller and deposits it on the sheets clamped to a table below. The adhesive-applying bar is modified in that the lower part 9 is made separate from the frame structure, and is in the form of a rigid bar rotatably mounted in end bearings in the frame member 9<a>, so that its lower surface, which receives adhesive from the roller 12, automatically assumes the correct inclination to the horizontal as is necessary for making proper contact with the inclined end portions of the sheets to be gummed thereby. The bar 9 is retained in normal position against adjustable stops preferably by two coiled tension springs 13 attached to the bar and to end brackets 14. In order to reduce friction between the lower edge of the frame member 9<a> and the top edge of the bar 9, the former is provided with one or more removable roller bearings 18, Fig. 8, and the part of the bar 9 engaging the rollers is furnished with replaceable sections 9<e> of hardened steel or other bearing metal. In using the machine, a pile of sheets, consisting of a plurality of sets or units arranged as shown in Fig. 1, is clamped on the bed 22 against an adjustable guide 21. The operator lifts the top end of the pile and then drops all the sheets of the bottom set with the exception of the top sheet a, and the gumming-bar 9 is then brought down to apply gum. The top sheet a is then dropped, together with all the sheets, but the top sheet of the second set, and the bar 9 is again depressed. This procedure is adopted until all the sets have been gummed. Since with a large pile the inclination of the pile due to the stepped formation of the sheets becomes increasingly steep, compensating wedge-shaped bars may be introduced at the ends between the sets. The container for the gum has mounted therein a scraper or doctor blade 24 for regulating the amount of gum taken up by the roller 26, with which contacts the roller 12. The rear side of the doctor is provided with a series of shaped ribs 27 which are engaged by the ends of screws 28 to regulate the distance between the doctor and the roller 26. To enable the machine to be used for applying strips of gum at spaced distances along the sheets of a pile the guide 21 is attached to the bed by slotted extensions and screws.