IMPROVEMENTS IN MACHINES FOR STRAIGHTENING ROUND BARS OF METAL
Year: 1884

page_text: I, HERBERT JOHN HADDAN, of the firm of Herbert and Company, Patent Agents,
of 67, Strand, in the City of Westminster, Civil Engineer, do hereby declare the
nature of my Invention for IMPROVEMENTS IN MACHINES FOR STRAIGHTENING
ROUND BARS OF METAL, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :—
My Invention relates to improvements in machines for straightening round bars
of metal; and it consists in certain features of construction and in combination of
parts hereinafter described and pointed out in the claims.
My Invention is embodied in a machine in which the bars of metal to be
straightened are revolved and fed through the machine by means of feed rollers
that are set with their axes on a plane that is oblique to the axis of the bar of
metal that is acted upon. The machine is also provided with sets of straightening
rollers that press upon the revolving bar from opposite sides and at different points
lengthwise of the bar, and deflect the bar about as much as a straight bar could be
deflected and regain its straight condition by its elasticity. When crooked or
curved bars are passed through the machine and the outside of the curve comes in
contact with the straightening rollers the bar is deflected in addition to the
deflection to which a straight bar is subjected, a deflection also equal to the
curvature of the bar, which is that much greater that the bar will." spring back
or regain by its elasticity, and the bar therefore, when it leaves the machine will
be straight.
In the Drawings, Fig. 1 is a sido elevation. Fig. 2 is a plan view, and Fig. 3 a
transverse section. Fig. 4 is a transverso section.
A represents the bed plate, to which are attached the pillow-blocks B, in which
are journalled the feed-rollers B', and the standards C and C, in which are
journalled respectively, the straightening rollers c and c. D is a shaft provided at
one end with a driving pulley D', and loose pulley D³, and at the other with the
pinion d, engaging the gear E, that is secured to the same shaft as is the pinion e
that engages alike the intermittent gears F, that in turn engage the gears G that
are respectively attached to the trunnions of the feed-rollers B'. The boxes in
which are journalled the trunnions of the feed rollers B¹ are set in the pillow-
blocks, and are provided with the set screws H, by means of which the rollers are

page_text: .
adjusted laterally and made to engage bars of different size with the required
pressure. K and K' are adjustable guides the former operating from above and
the latter from below the shaft, and hold the shaft vertically in its place between
the feed rollers. The guides are adjusted by the set-screws and l'. The axes of
the feed-rollers are not in the same plane with the axis of the bar in its passago
through the machine, but are slightly inclined thereto, so that the feed-rollers as
they revolve not only revolve the bar, but feed it through the machine. The
standards C and C have slots in their baso flanges running cross wise of the
machine, through which bolts pass that fasten the standards to the base of the
machine, making the standards adjustable; also a slot m running lengthwise of
the machine allows the standard O to be adjusted in this direction also. A rib n
projects upward from the bed-plate behind the standard C, and by driving a wedge
between the said rib and the standards the latter may be forced forward toward
the bar R, that is passing through the machine undergoing the straightening
process.
In operating the machine, the feed rollers B¹ and the guides K and K¹ are
separated, so that the shaft may be readily passed between them. After the shaft
is in position the guides are returned to the proper position, and the feed-rollers
are pressed against the shaft with sufficient force to revolve and feed the shaft.
The standard is also drawn back and the shaft passed on to an engagement with
the rollers C, after which the standard C is pressed forward until the rollers c
deflect the shaft sufficiently as shown in Fig. 2, and the machine is set in motion.
When the shaft has passed the feed roller, there will be no pressure on it and is
free to be removed from the machine. The feed rollers might be set to feed in the
opposite direction, and the shaft in that case would be entered from the other end
of the machine.
•
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is:
1 In a machine for straightening round bars of metal, the combination of feed-
rollers for revolving and feeding the bar and straightening rollers so arranged as to
bear against the bar at different points and from opposite sides, substantially as
set forth.
2nd In a machine for straightening round bars of metal, the combination, of feed
rolls, adjustable guides adapted to hold the shaft in position between the feed
rollers, and adjustable straightening rollers so arranged as to bear against the bar
at different points and from opposite sides, substantially as set forth.
3rd In a machine for straightening round bars of metal or shafting, provided
with feed-rollers for revolving and feeding the shaft or bar through the machine,
straightening rollers set in pairs in suitable bearings, and so arranged that different
pairs of rollers will engage the shaft or bar at different points and from opposite
sides and with the bearing of one or more of the pairs or rollers made adjustable
crosswise of the shaft, so that they may be made to press against and deflect the
shaft, substantially as set forth.