Patent GB-1250620-A (GB)
IPC: A43D25/06
Filed: 1968-12-04
Abstract: 1,250,620. Boots &c. BRITISH UNITED SHOE MACHINERY CO. 3 Dec., 1969 [3 May, 1969; 4 Dec., 1969], Nos. 57495/68 and 22672/69. Addition to 1,182,775. Heading A3B. [Also in Division B2] The lasting machine of the Parent Specification, which includes an adhesive applying device in which a metered quantity of adhesive is ejected from a first chamber by a blast of compressed air, is modified by the addition of means for feeding adhesive in solid rod form into a melting chamber so that it forces adhesive previously melted into the first chamber, the length of rod fed into the melting chamber determining the amount of molten adhesive metered into the first chamber. The adhesive applying device 18 (Fig. 3), which acts as a holddown in the lasting machine, consists of a main body 112 and a metal block 142 which are heated by an electric heater 144, and a foot 118 having outlets 133 which direct adhesive onto the insole and/or lasting margin. Adhesive in solid rod form is fed into a meltchamber 146 in the block 142 and as it is fed forces previously melted adhesive along passages 148, 158, 152 and 154 and a tube 140 into a chamber formed by a recess in the top of foot 118. The adhesive is ejected from the chamber by a blast of compressed air from a passage 114 coaxial with the tube 140. The adhesive rod R (Fig. 5) is fed from a feed device 143 to the applicator along a flexible tube 139. A feed member 149 is reciprocated by a piston and cylinder 153 and has pawls 151 which engage in slots 147 in a tube 145 through which the rod R passes. When the feed member 149 is raised the pawls 151 grip the rod R to feed it along the tube 139 and when the feed member 149 is lowered the pawls 151 slip on the rod R, reverse movement of the rod R being prevented by check pawls 185. The stroke of the feed member 149 is limited by stop plate 171 which can be adjusted by screw 173 and thus determines the quantity of adhesive metered into the chamber in the foot 118. In a first embodiment (Fig. 2) the adhesive applying device 18 forms a hold-down in a lasting machine of the type described in Specification No. 1,034,662. The hold-down 18 is mounted on a bell-crank 36 and is held in operative position by a latch 44 which engages a plate 42 on the bell crank 36. When the wipers (not shown) advance a screw 43 on the wiper carriage moves the latch 44 and allows the hold-down to be raised clear of the wipers by springs 41. In a second embodiment (Fig. 9) the adhesive applying device 18 forms a hold-down 330 in a lasting machine of the type described in the Parent Specification. The hold down 330 is mounted on an arm 380 which is pivoted to block 397 which can slide along guides 386. The blocks 397 are connected to a piston and cylinder device 392 which, when operated, initially causes forward movement of the hold-down 338 to a position above the insole, and then, when a lug 406 on the arm 380 engages a stop screw 408, causes the arm 380 to tilt about pivots 382 to lower the hold-down into operative position. The upper and insole may be mounted on a last (not shown), in which case the hold-down depresses the last until the insole is level with the wipers, or on a fixed metal form (not shown) in which case the holddown stops just above the level of the insole.