Patent GB-1326839-A (GB)
Title: Apparatus for grooving and or longitudinally cutting a continuous web
IPC: B26D7/26
Filed: 1971-09-23
Abstract: 1326839 Cutting apparatus WERNER H K PETERS MASCHINENFABRIK GmbH 23 Sept 1971 [26 Sept 1970] 44437/71 Heading B4B [Also in Division B6] An apparatus for longitudinally cutting or grooving a continuous web 26 of cardboard or paper comprises at least one tool 5a mounted on a shaft 1 extending transversely to the direction of travel of the web, the tool being displaceably mounted on the shaft by means of a nut-andthread adjusting device 11, 12, 13, the device being controlled by means 56, 30, 31. The cutting tool, i.e. a disc 5a, is mounted on one half 13, Fig. 1, of a split nut 12, 13, which is adjustable on a thread formed on the shaft; the halves of the nut are urged apart by springs 14 so that the nut tightly grips the shaft. In order to release the grip of the nut on the thread for adjustment of the cutting disc, a pair of arms 15a, 15b, Fig. 3a, are pivotally connected together and movable along a rail 27. The arms are each provided with plates 18a, 18b connected therewith by pneumatically-actuated rams 17 such that when the arms are moved by a pneumatically-actuated ram 51 to align with the nut, Fig. 3 (not shown), the plates are moved by the rams 17 to engage the nut and thereby release the grip on the thread; tooth members 35 are provided on the arms for engagement with a slotted disc 34 secured to the nut. The shaft 1 is rotated by means of a motor M, Fig. 1, via selective gear trains 20a, 20b, 20c, the particular gear train being coupled to the shaft by means of clutches 19a, 19b, 19c respectively. When it is desired to re-adjust the position of a cutter, a carriage 36, Fig. 4, is moved on a graduated slide rail 37 to correspond with the required position of the cutter. The arms 15a, 15b are then actuated to release the nut and the motor M energized to rotate the shaft at a fast speed via gear train 20c and clutch 19c. A second carriage 40 is movable on a further slide rail 41 via a screw 43, and chain drive 43 connected to the shaft 1. Air nozzles 45, 46, 47 are mounted on the carriage 40 such that when the nozzle 46 is obstructed by a plate 38 on the preset carriage 36, a pneumatic signal is fed to a controller 56 so as to disengage the clutch 19c and engage the clutch 19b so that the shaft is rotated at a slower speed. Upon the nozzle 45 being obstructed by the plate 38, the clutch 19b is disengaged and the clutch 19a engaged thereby rotating the shaft 1 at a creeping speed. The shaft is finally stopped with both carriages 40, 36 in alignment when a photo-electric device 31, Fig. 4, co-operating with a slotted-edged disc 30 produces a signal to de-energize the motor M. To obtain extreme accuracy pneumatically-actuated latches 32 and 49a are moved into slots formed on discs 30, 48 secured to the shaft 1 and screw 43 respectively, the relationship of the slots corresponding with those on the discs 30 and 34. Upon completion of the setting operation, the rams 17, 51 on the arms 15a, 15b are actuated so as to allow the nut to again grip the shaft 1 in its new position. As shown in the Figures, a second shaft 4 having further cutter 5 for co-operation with the cutter on the shaft 1, the adjustment of the cutter on the shaft 4 being effected simultaneously in the same way as described above, the two shafts being connected by gears 22, 23, Fig. 1. In order to maintain lateral contact between the two co-operating cutting discs, the shaft 1 is movable axially by means of a pneumaticallyactuated ram 60, Fig. 1. The shaft 4 is moved away from the shaft 1 as shown in Fig. 1 during the setting of the cutters. The air hose for supplying air to the rams 17, 51 is arranged to pass around take-up pulleys 71, Fig. 6, provided in the machine frames 2, 3. As described several pairs of cutters may be provided on the two shafts 1, 4 and more than one pair of shafts may be mounted in the machine. Tools 6a, 6b, Fig. 4, may be provided for forming grooves in the web.