| 摘要 |
1,166,570. Seaming non-metallic sheet material. H. KUPER, [trading as HEINRICH KUPER]. 20 Feb., 1968 [27 Feb., 1967], No. 8169/68. Heading B5K. Machine for providing individual veneers or sheets of veneers joined edgewise along the run of the grain with a cross-tie in the form of a thread adhesively fixed to the veneers crosswise of the joints and/or grain, comprises feed means 13 for continuously feeding the veneers on a work-table 11 crosswise of the joints and/or grain underneath a supply means 25 for running a preheated thread 26 coated with an adhesive under pressure on to the surface of the feeding veneers, and braking means 22, 23 to retard the forward feed of the veneers and which operate to close open joints and splits in the grain whilst the thread is being applied and the adhesive sets. The feed means comprises a driven roller 13 mounted to project through an opening in the table 11. A slide 15 is adjustably mounted on a rod 14 extending across the table 11 and carries a bracket 16 having a bearing block 17 mounted thereon. The block 17 carries a presser foot 18 having an upturned nose and which is adapted to press the veneer downwards on to the roller 13. The foot 18 is vertically adjustable by a nut 20. The braking means comprises a downholder 22, preferably a length of steel band, suspended from a curved arm 21 carried by the block 17 and an electromagnetic bar 23 of adjustable power parallel to the roller 13. A vertical thread guide and heater 25 extends through an opening 24 in the downholder 22 and is attached to the slide 15 by triangular frames 27. The guide and heater 25 comprises an outer tube 29, Fig. 4, surrounding an inner quartz or quartz glass tube 30 surrounded by a heating coil 31 of circular or flat section wire. The tube 30 and the coil 31 are embedded in an insulating material 32. The lower end of the guide and heater 25 is convexly domed whilst the end of the tube 30 is flared and rounded. Preferably, the thread 26 is non-stretchable and may be of glass silk coated with a heat-sensitive adhesive. In operation, the thread 26 from a package 42 passes through eyelets in a stand 43 and into the guide and heater 25. The veneers which have been joined edgewise along the grain are fed, crosswise of the grain, into the machine in the direction A and, as they are driven across the table 11 by the roller 13, are subjected to the braking action of the downholder 22 and the bar 23 to cause any cracks or splits in the grain as well as the joints to be pushed together. The thread 26 is continuously drawn down the guide and heater 25 and is applied to the veneers across the grain and joints. When the sheet has run through the machine, a solenoid 38, fixed to the slide 15, is operated to actuate a knife blade 39 through a push-rod 37 hinged to a lever 36 fixed to a vertical hinge-pin (35), Fig. 2 (not shown), in a bearing 34. Simultaneously, the lever 36 operates a rod 40 and a bellcrank 41 to swing the frames 27 upwardly to lift the guide and heater 25 to provide a passage for the blade 39 to swing about its hinge to sever the thread 26. The blade 39 and the guide and heater 25 then return to their original positions. The machine may be provided with several work-tables 46 working parallel to the table 11 so that several threads can be applied simultaneously. |
