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Title: |
1905 Article-Ransome, A., & Co., Horizontal Log Band Saw |
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Source: |
Timber & Woodworking Machinery, Special Issue, 15 Mar 1905 |
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Insert Date: |
12/19/2016 11:49:10 AM |
Fig. 7 represents an electrically driven horizontal log band-saw by with the axis. The bearings are of the automatic ring oiling type. It is A. Ransome & Co., Ltd., Newark-on-Trent.
In this machine, the saw pulley axle is connected direct with the motor by means of a Renold’s silent driving chain, 8-in. wide by 1¾-in. pitch. The motor is carried on a platform supported on a strong steel screw provided with a gun-metal nut, which is fitted with a worm-wheel. This worm-wheel is actuated by a worm fitted to a horizontal shaft and driven by the same gearing operating the shaft carrying the worms, which actuate the two screws on the machine itself for raising the saw-carriage to suit different thicknesses of cut and by this means the motor and saw-carriage are maintained in their relative positions. The raising gear rests on a strong ball-thrust collar, by means of which the friction is reduced to a minimum. The feed and saw-raising gear is driven by a separate motor coupled direct to the driving shaft. The total width of the floor space occupied by this machine when driven as above described is only 18-ft. 6-in., and when, in addition to this, it is remembered that neither countershaft nor belting are required under the new conditions, the advantages to be derived from the Direct Electric Drive will be immediately patent to all who have a practical knowledge of machinery. The motors usually employed for driving are of the four-pole protected type. The frame and magnet cores are made of cast-steel of high permeability, and the latter are circular in cross section. The magnet coils are of best high conductivity copper, and are wound on separate formers which are easily replaced. The armature is of the slotted drum type, built up of special armature iron about No. 24 S.W.G. in thickness. The armature winding consists of coils formed and thoroughly insulated before they are laid in the slots. The commutator is mounted on a separate sleeve, having air passages parallel with the axis. The bearing are of the automatic ring oiling type. It is claimed that these motors will carry an overload of 25 per cent. for at least In this machine the saw pulley axle is connected direct with the one hour without injurious heating or sparking. |
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1905 Ransome, A., & Co., Horizontal Log Band Saw
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