Improvements in Horizontal Band Sawing Machines.
Year: 1897

page_text: Date of Application, 20th Jan., 1897-Accepted, 27th Feb., 1897
COMPLETE SPECIFICATION.
Improvements in Horizontal Band Sawing Machines.
I, ERNST KIRCHNER, Manufacturer, of Sellerhausen near Leipzig, in the
Kingdom of Saxony, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained:
in and by the following statement:-
This invention relates to a band sawing machine for sawing logs, which differs
from others by a peculiar arrangement and operation of its principal mechanisms,
the object being to increase the efficiency of the machine, besides facilitating the.
work of the attendant.
In the accompanying drawings Fig. 1 is a front elevation of a band saw
embodying my invention, and Fig. 2 is a side view of the same.
The principal feature of novelty is the arrangement of the log carriage A
between the upper and lower part (that is to say in the interior) of the endless saw
blade mounted on saw pulleys with horizontal axis.
It will be noticed, that the saw blade cuts the log with its upper half, in.
consequence of which the machine and the piece of work is easier to survey than
usual, the attendance on the machine is simplified, the height of the machine above
the floor is reduced, and the safety of the attendant from injury is increased.
The guides B for the saw blade are adjustable, so that the cutting blade may be
guided in close proximity to the log. The back of the saw blade runs over a pair
of wooden pegs b, each of which is surrounded by a steel ring and may be.
re-adjusted after wear by turning it on its axis in a clamping sleeve a.
The axles c and c² of the saw pulleys are mounted in uniformly lubricated
bearings C1, C2, which latter are combined with a peculiar device for regulating
the tension of the blade.
The standards or brackets D, which carry the bearings of the pulley axles, are
connected with each other by cross stays d, and are capable of simultaneous.
adjustment up and down.
The tension of the saw blade is capable of being regulated by hand and
automatically, for which purpose the axle bearings C² are mounted in a pair of
horizontally movable slide blocks E which can be shifted by means of horizontal
screw spindles c. These spindles may be turned on their respective axes by means
of a handwheel e¹ and worm gearing, and are exposed to the pressure of a weight G
through the intermediary of a system of levers H, h and a pair of cams t, adapted
to press on the spindles e in the direction of the arrow. The worm wheels are, of
course, mounted on their respective spindles e by means of groove and feather, so
as to allow the spindles to move axially under the pressure of the cams t.
For exchanging the saw blade, the axle c² must be relieved from pressure, and
this is effected by means of a ratchet lever g, ratchet wheelf, and weighted chain k,
the said chain being attached at one end to the weighted lever H and running
over a pulley mounted on the axle of the ratchet wheelf, as shown by Fig. 1.
The accurate adjustment of the bearings C1, C2, is effected by means of set
screws i, i, as shown.
The log carriage A receives its motion through a wire rope mechanism, as
illustrated by Fig. 2. For this purpose a rope s, attached to the ends of the
carriage A, is coiled once or twice on the rope drum S.
The bearings K of the drum shaft are pressed down by weighted levers l, so as.
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page_text: to ensure a firm grip between the circumference of the rope drum and the friction
rollers T, T, mounted underneath the same, and thereby to couple the drum with
the feed mechanism which drives the axle of the friction rollers.
If desired, the log carriage may also be connected with a mechanism for
producing a rapid return motion.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :
1. A horizontal band sawing machine having the distinctive feature, that the
log carriage is arranged to run between the upper and lower half of the saw
blade, and that the saw blade cuts the log with its upper half, substantially as
described.
2. In a horizontal band sawing machine of the type specified, a pair of adjustable
saw blade guides B, substantially as described.
3. In a horizontal band sawing machine of the type specified, a tension
regulating device for the saw blade, comprising a weighted lever H, lever
mechanism, cams t, adjustable screw spindles e, and movable side blocks E,
substantially as described.
4. In a horizontal band sawing machine of the type specified, the combination
of a pulley axle c² with bearings (2 and set screws i, i, adapted to regulate the
position of the said axle, substantially as described.
5. In a horizontal band sawing machine of the type specified, a feed mechanism
for the log carriage, comprising in its construction a rope s, drum S, rollers T and
weighted lever 17, substantially as described.
T