|
Main
- books.jibble.org
My Books
- IRC Hacks
Misc. Articles
- Meaning of Jibble
- M4 Su Doku
- Computer Scrapbooking
- Setting up Java
- Bootable Java
- Cookies in Java
- Dynamic Graphs
- Social Shakespeare
External Links
- Paul Mutton
- Jibble Photo Gallery
- Jibble Forums
- Google Landmarks
- Jibble Shop
- Free Books
- Intershot Ltd
|
books.jibble.org
Previous Page
| Next Page
Page 6
[Illustration: FIG. 2 AUGUSTE'S STONE SAW.]
[Illustration: FIGS. 3 and 4 AUGUSTE'S STONE SAW.]
[Illustration: FIGS. 5 through 10 AUGUSTE'S STONE SAW.]
The machine is wholly of cast iron. The frame consists of four
columns, A, bolted to a rectangular bed plate, A', and connected above
by a frame, B, that forms a table for the support of the transmission
pieces, as well as the iron ladders, _a_, and the platform, _b_, that
supports the water reservoirs, C, and sand receptacles, C'.
Between the two columns at the ends of the machine there are two
crosspieces, D and D', so arranged that they can move vertically, like
carriages. These pieces carry the axles of the pulleys, P and P',
around which the band saw, S, passes. In the center of the bed plate,
A', which is cast in two pieces connected by bolts, there are ties to
which are screwed iron rails, _e_, which form a railway over which the
platform car, E, carrying the stone is made to advance beneath the
saw.
The saw consists of an endless band of steel, either smooth or
provided with teeth that are spaced according to the nature of the
material to be worked. It passes around the pulleys, P and P', which
are each encircled by a wide and stout band of rubber to cause the
blade to adhere, and which are likewise provided with two flanges. Of
the latter, the upper one is cast in a piece with the pulley, and the
lower one is formed of sections of a circle connected by screws. The
pulley, P, is fast, and carries along the saw; the other, P', is
loose, and its hub is provided with a bronze socket (Figs. 1 and 4).
It is through this second pulley that the blade is given the desired
tension, and to this effect its axle is forged with a small disk
adjusted in a frame and traversed by a screw, _d'_, which is
maneuvered through a hand wheel. The extremities of the crosspieces, D
and D', are provided with brass sockets through which the pieces slide
up and down the columns, with slight friction, under the action of the
vertical screws, _g_ and _g'_, within the columns.
A rotary motion is communicated to the four screws simultaneously by
the transmission arranged upon the frame. To this effect, the pulley,
P, which receives the motion and transmits it to the saw, has its
axle, _f_, prolonged, and grooved throughout its length in order that
it may always be carried along, whatever be the place it occupies, by
the hollow shaft, F, which is provided at the upper extremity with a
bevel wheel and two keys placed at the level of the bronze collars of
its support, G. The slider, D, is cast in a piece with the pillow
block that supports the shaft, _f_, and the bronze bushing of this
pillow block is arranged to receive a shoulder and an annular
projection, both forged with the shaft and designed to carry it, as
well as the pulley, P, keyed to its extremity. Now the latter, by its
weight, exerts a pressure which determines a sensible friction upon
the bushing through this shoulder and projection, and, in order to
diminish the same, the bushing is continuously moistened with a
solution of soap and water through the pipe, _g_, which runs from the
reservoir, G'.
The saw is kept from deviating from its course by movable guides
placed on the sliders, D and D'. These guides, H and H', each consist
of a cast iron box fixed by a nut to the extremity of the arms, _h_
and _h'_, and coupled by crosspieces, _j_ and _j'_, which keep them
apart and give the guides the necessary rigidity.
The shaft, _m_, mounted in pillow blocks fixed to the left extremity
of the frame, receives motion from the motor through the pulley, _p_,
at the side of which is mounted the loose pulley, _p_. This motion is
transmitted by the drum, M, and the pulley, L, to the shaft, _l_, at
the other extremity. This latter is provided with a pinion, _l'_,
which, through the wheel, F', gives motion to the saw. The shaft, _m_,
likewise controls the upward or downward motion of the saw through the
small drums, N and _n_, and the two pairs of fast and loose pulleys,
N' and _n'_. This shaft, too, transmits motion (a very slow one) to
the four screws, _g_ and _g'_, in the interior of the columns, and the
nuts of which are affixed to the sliders, D and D'. To this effect,
the shaft, _q_, is provided at its extremities with endless screws
that gear with two wheels, _q_', with helicoidal teeth fixed near the
middle of two parallel axes, _r_, running above the table, B, and
terminating in bevel wheels, _r'_, that engage with similar wheels
fixed at the end of the screws, _g_ and _g'_.
The car that carries the block to the saw consists of a strong frame,
E, mounted upon four wheels. This frame is provided with a pivot and a
circular track for the reception of the cast iron platform, E', which
rests thereon through the intermedium of rollers. Between the
rails, _e_, and parallel with them, are fixed two strong screws, _e'_,
held by supports that raise them to the bottom of the car frame, so
that they can be affixed thereto. When once the car is fastened in
this way, the screws are revolved by means of winches, and the block
is thus made to advance or recede a sufficient distance to make the
lines marked on its surface come exactly opposite the saw blade.
Previous Page
| Next Page
|
|