Patent GB-1115976-A (GB)
Title: Sawing apparatus
IPC: B23D47/04
Filed: 1966-07-06
Abstract: 1,115,976. Sawing. MO OCH DOMSJO, AKTIEBOLAG. 6 July, 1966 [7 July, 1965] No. 30391/66. Heading B5L. Apparatus for sawing logs or the like of varying diameter into lengths comprises a rotatable support frame 5 for the logs to be sawn having a plurality of gripping assemblies 7 mounted for rotation therewith, each assembly having a movable jaw 16 shaped to receive and adjustably grip a log which is positioned parallel to the axis of rotation of the frame, means to move the log axially of the frame to a selected position, and sawing means 54 for cutting a log held on the frame as the frame is rotated. The frame is mounted for rotation in cantilever manner in a bearing 4 on a bed 1 supported on wheels 2. One part of the frame 5 comprises a receiving section consisting of beams 52 extending from the bearing and joined to transverse plates 53. A second part of the frame comprises a delivery section which is disposed between the bearing 4 and a bearing 3 for rotation with the receiving section and consists of beams 42 connected to support plates 51. The saw blade 54 is carried by a pedestal 9 adjustable to permit cutting of the logs at predetermined angles. The gripping assemblies 7 are aligned in rows adjacent the beams 52 and each comprises a yoke 20, Fig. 6, supported by a pair of rods 36 slidable in guides 46 on a beam 52, the yoke being movable by a gear drive or fluid motor 18 so that a pair of V-shaped rollers 19 mounted on an arm 16 extending from the yoke are moved towards or away from a V-shaped roller 21 which is mounted on the support plate 53 and is rotated by a motor 22 through a transmission 23. The gripping assemblies 7 on the receiving section of the frame face in the direction of rotation of the frame while those on the delivery section face in the opposite direction. When a log is gripped by the assemblies, the motors 22 can be operated to move the log axially to a stop 10, there being a stop aligned with each row of gripping assemblies. Each stop consists of a carriage 37, Fig. 7, having wheels 40, 41 for engagement with the beams 42 and a member 17 for abutment by the log. The carriage may be moved to a position determined by the operator of the machine whereupon a motor 35 is actuated to cause a catch 32 to engage a selected stop 34 on a rod 60 which then moves axially against a spring 50 to operate a switch 55 controlling the motors 22 advancing the log. In an alternative embodiment the stop is located in position by catches controlled by a motor and engageable with cleats on the beams 48. The stops 10 are returnable to positions adjacent the bearing 4 by engagement of girders 31 with rollers 30, Fig. 7 on the carriages. In operation, logs are fed along a table and are supported on a cradle for engagement by the gripping device 7, the hydraulic motors of which are then operated so that the assemblies grip the logs as the frame reaches a particular rotational position. At a further rotational position, the motors 22 are operated to drive the log axially to engage the associated stop 10, operation of its switch 55 stopping the motors 22 driving the log axially; the stops may be moved by the logs to their predetermined position. Thereafter, the log is carried past the saw, the gripping assemblies on the delivery section of the frame opening so that the severed piece of log can be received by a discharge conveyer. In other embodiments, the saw is a chain saw, the gripping assemblies comprise L- or C-shaped members movable about pivots to grip the logs, or the rollers of the assemblies may be replaced by flat-bearing surfaces or chain conveyers.