Adhesive-applying apparatus
AssigneeBritish United Shoe Machinery Ltd.
InventorsRaymond Hanson, Malcolm Tillyard
Life of this patent
Estimating the term…
Abstract
A nozzle having a flexible blade member with a flat adhesive-receiving surface in combination with a rotary transfer roll and side wall elements forms a reservoir for adhesive "upstream" (in the direction of roll rotation) of the line of contact of a straight edge of the surface with the roll surface, the arrangement being such that a layer of the adhesive, doctored by blade member to control its thickness and with its width controlled by the wall elements, is applied to the roll surface and carried thereby to the operating locality. An adhesive supply system is also provided for supplying adhesive to the reservoir, said system including a melting device for adhesive in solid form and pressure control means for controlling the pressure under which the adhesive is supplied.
Claims57
Adhesive-applying apparatus whereby a layer of moisture-curable adhesive in a molten state can be applied to a surface portion of a workpiece presented to an operating locality of the apparatus, said apparatus comprising
- a cylindrical transfer roll arranged at the operating locality, together with heating means for heating the transfer roll, and drive means for effecting rotation of the transfer roll,
- a flexible blade member terminating in a straight edge which is held in line contact engagement with the surface of the transfer roll, the "upstream" (in terms of the direction of rotation of the transfer roll) face of said member being inclined at an acute angle to a plane which lies tangential to the surface of the transfer roll and passes through the line of contact with the blade member, and
- two wall elements arranged one at either side of the blade member and extending "upstream" therefrom and sealingly engaging with the transfer roll, thus to form with the blade member and the surface of the transfer roll a reservoir to which molten adhesive can be supplied from a supply thereof and in which it can be contained, the arrangement being such that as the transfer roll is caused to rotate a layer of molten adhesive, the thickness of which is determined by the flexible blade member, is formed on the surface of the transfer roll and carried thereby to the operating locality.
Dependencies are inferred from the claim text.