Patent GB-190512743-A (GB)
Title: Improvements in Machines Employed in the Manufacture of Abrading Surfaces on Sheets, Backings or the like.
Inventor: LASCH ROBERT HELMUTH
Filed: 1905-06-20
Granted: 1906-01-25
Abstract: 12,743. Lasch, R. H. June 20. Glueing.-In a machine for applying glue &c. to sheets in the process of making emery &c. paper or cloth, particularly those sheets in which the abrading-surface is formed with recesses or clear spaces, the sheets are held by pneumatic devices against an inteimittently rotating platen which is held in the requisite position while a glue-depositing head comes in contact with the sheets. The glue &c. is carried in a steamjacketed vessel 3, Figs. 1 and 2, moving on rails 5. A guideway 6 is formed in the centre of the vessel, and a rod 8 passes through this guide and a guide 7 through the platform 1, when the glue vessel 3 is in its operative position. The rod 8 carries at its upper end a removable gluedepositing head 9, Fig. 3, which comprises a hanger 10 carrying vertical pins 11, the ends of which are in one plane and can be depressed below the surface of the glue. These pins are so arranged that when the head is raised they carry a small quantity of glue to the paper and deposit it there according to any desired pattern. Ribs may be used in place of the pins if desired. The head is attached by a nut to the rod 8, and when it is detached the rod can be removed from the guide, and the glue vessel run off on the rails 5 for cleaning &c. purposes. Mechanism is provided for reciprocating the rod 8 carrying the glue-depositing head, and also for rotating the platen head carrying the sheets of paper. The cam shaft 18 is driven by worm gearing 17 from the shaft 15. A rocking shaft 22, Fig. 10, is carried in hangers 23 and carries an arm 24 rigidly attached to it. This arm has at its farther end a stud 25 which works in the groove 21 in the cam 20. A lever 26 is pivoted on the stud 25, and one end is pivotally fastened to the rod 8, while the other embraces a cam 27 on the shaft 22. A foot-operated push-rod 30 moves a slotted arm 29 and rotates the cam 27 on the shaft 22, thus raising the end of the arm 26 and lowering the limit of upward movement of the glue-depositing head so that it will not reach the platen. The upward stroke can thus be varied without interference with the regular motion of the platen. A crank-arm 32, Fig. 1, rigid with tho - rock-shaft reciprocates the rod 33 and operates the arrangement for presenting the sheets &c. to, and removing them from, the glue-receiving position. A shaft 35, Figs. 1 and 2, arranged above the glue-depositing head, carries at its end a vertical disk 36, provided with locking-notches 37. This disk has an annular flange 38 formed with equally spaced .edge notches 39. The reciprocating rod 33 is pivotally attached to one end of a rocking arm 40 pivoted on the shaft 35. The other end of this arm carries a spring-operated pin 42 which takes into the notches at the edge of the flange 38. The flange is thus made to turn in one direction with the lever, while the pins slip out of the notches when the arm travels in the other direction. A spring bolt 47, carried in a fixed casing 48 radially to the disk 36, enters the notches in the disk and prevents rotation of the shaft 35. As the rod 33 descends, a tappet 51 catches a swinging toe 50 attached to the bolt 47 and moves the bolt out of the notch 37 and allows the shaft to rotate until the bolt springs back into the next notch. On the upward movement of the rod, the tappet slips past the toe 50. The arrangement for holding the paper comprises a box mounted on the shaft 35. This box is illustrated as having four plates for holding the paper. It is divided into fonr separate compartments 55, Fig. 5, each of which is connected through a port 56 to the vacuum chamber in an air-chest 63, and through slots 58, to one of the perforated platen plates 59. Hollow central portions 61, which may have flanges 62 to aline the sheets, are provided on the platens for the reception of the head of the glue-depositing device. The inner face of the air-chest 63 is provided with an elongated port 69, Fig. 6, and a port 80 open to the atmosphere, or to air under pressure if very rapid discharge of the sheets is required, is also provided. The paper on the npper horizontal platen is thus not under the action of any suction, but as the box turns, the port 56 comes over the port 69 and the paper is held by suction until it has passed its lowest position. It is then cut off from the suction and reaches the releasing-port 80, when the paper slips off on to the stand 81 and passes along on an endless belt under the grit-distributing devices.