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    • 4. 发明专利
    • Improvements in machines for sawing timber
    • GB685059A
    • 1952-12-31
    • GB2905349
    • 1949-11-14
    • PHILLIP HARWOODGORDON ROBERT JACOB
    • B27B5/18
    • 685,059. Circular saws. HARWOOD, P., and JACOB, G. R. Nov. 14, 1950 [Nov. 14, 1949], No. 29053/49 Class 145 (ii). A timber saw has a power-driven circular saw displaced by a hydraulic ram across the length of timber supported by a carriage, to be conveyed at right angles to the plane of the saw. The timber is also supported by pairs of rolls disposed on intersecting axes inclined to one another and arranged on either side of the path traversed by the saw in its cutting operation. The saw 13 powered by an electric motor 11 is carried by carriage 12, the motor also driving a hydraulic pump delivering to a single acting ram 15. The carriage is driven up rails 17 (inclined at about 5 degrees from the horizontal) on V-grooved wheels 16 and additional wheels 18 are provided to engage the underside of the rail supports 17a. The carriage is returned 'by gravity. Valves and limit stops enable the sawtraverse to be started manually by lever 20 and to complete and reverse automatically. A truck 26, Fig. 4, supports the bulk of the work 25 and is urged along rails 27 by continuous rope 28 and winch 29. The work is supported by rollers 31, 32 inclined as shown in front of the blade and a second pair of rollers behind the blade. One of the latter rollers, 34, may be horizontal to help open the cuts to clear the saw. Intermittent support means which may take the form of a belt 35, with a line of dogs 36, may deliver the cut-off work to a further conveyer. The saw guard 13a and the roller assembly in the vicinity of the saw may be lined with wood to prevent damage to the saw blade.
    • 7. 发明专利
    • Improvements in or relating to saw-benches
    • GB700412A
    • 1953-12-02
    • GB2789150
    • 1950-11-15
    • PHILLIP HARWOODGORDON ROBERT JACOB
    • B27B5/22
    • 700,412. Circular saws. HARWOOD, P., and JACOB, G. R. Feb. 15, 1952 [Nov. 15, 1950], No. 27891/50. Class 145 (2) A circular re-sawing machine comprises two to twelve simultaneously cutting blades and an associated, independent positively acting driving means arranged above the blades to press upon and advance the work being sawn at a speed proportional to the blade speed, the means being adjustable towards and away from the bench and being resiliently compensated. The work is advanced by rollers 4, 5 journalled in a triangular frame 6 for rocking motion about its apex where it is secured to an arm 7, the latter being acted upon by an adjustable spring 20, through the shaft 24 and arm 7a. The latter arm is engaged by a cam 13 which is adjustable by lever 8 to set the minimum clearance between the rollers and saw blades. A flat 13a on the cam gives a self locking action when the arm 7 is fully raised for attention to the saws &c. Lever 27a is provided to give an independent lifting action on the rollers and is controlled by the pedal 26. It is attached to the triangular plate by a slotted connection to allow the rollers to adjust themselves to slight irregularities in the work size and is attached nearer the roller 4 so that this roller exerts more pressure on the work than the other roller 5. Idling rollers 28, 29 facilitate movement of the work. The rollers are driven by a chain engaging sprockets 4a, 5a, 16 and idler 17 and a further chain engaging sprockets 16 and 19. The latter is driven from an independent motor through a gearbox. The sawblade unit may be removable or adjustable in height. A roller form and counterbalanced pressure roll, also a coolant system, may also be provided.
    • 8. 发明专利
    • Circular saw machines
    • GB684330A
    • 1952-12-17
    • GB2905249
    • 1949-11-14
    • PHILLIP HARWOODGORDON ROBERT JACOB
    • B27B25/04
    • 684,330. Circular saws. HARWOOD, P., and JACOB, G. R. Nov. 14, 1950 [Nov. 14, 1949], No. 29052/49. Class 145 (ii). A circular saw has two parallel blades acting simultaneously and a positively acting driving means to advance the work at a speed relative to that of the saw, the driving means being connected via a variable ratio gearing to an endless chain conveying means having dogs projecting at intervals. Preferably every link is drilled to be capable of receiving a dog and the chain moves in a longitudinal slot centrally disposed in the bench. The embodiment shown has blades 11, 12 and an endless chain 33 carrying dogs (not shown) at intervals to engage the work placed in the central slot between tables 14, 15 which latter can be adjusted to incline downwardly to the chain to form a guiding trough for the work. The metal bearers 19, 20 support the work as it is being sawn. The saws are each laterally adjustable on splined shaft 13a, and are also steadied, by being engaged by shanks carried by an arm and engaging the saw near its periphery. A wheel 48 bears down on the sawn work to guide it and it may be driven or idle. An overhead V-roller may be provided in front of the saws for centering purposes. The dogs may be spring-loaded to lay flat when the work lies on top of them.