IMPROVEMENTS FOR ROLLING MILLS FOR CRUSHING AND GRINDING CORN, SEEDS, AND THE LIKE SUBSTANCES
Year: 1878

page_text: PROVISIONAL SPECIFICATION left by Frank Wirth at the Office of the
Commissioners of Patents on the 1st June 1878. A communication from
Christian Braun, Engineer, of Ravensburg, in the Empire of Germany.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at Frank-
fort-on-the-Main, in the Empire of Germany. "IMPROVEMENTS FOR ROLLING MILLS
FOR CRUSHING AND GRINDING CORN, SEEDS, AND THE LIKE SUBSTANCES." [A com-
munication from Christian Braun, Engineer, of Ravensburg, in the Empire of
Germany.]
My Invention relates to improvements in rolling mills for grinding purposes, and
differs in the following particulars from other apparatus heretofore used for the
same purpose.
1. The rollers are much larger in diameter than those now used.
2. The rollers are made of cast iron and chilled, or of paper, stone, or other
suitable material, according to the use to which they are to be applied.
3. Each roller is driven independently of the other, thus effecting a noiseless
movement, and one can be driven more rapidly than the other, or both at the same
velocity, the speed being regulated by the material being ground.
4. I employ an improved lever mechanism for pressing the said rolls together, or
for separating them as required.
5. The rollers are cleaned by cleaning rollers revolving in the opposite direction.
One of the said rollers is carried in fixed journals; the other roller is carried on
the upper ends of double armed levers; these levers turn on pivots and carry on
their lower ends a segment, which gears into small toothed wheels at the ends of a
shaft, to which is attached an arm carrying a weight. The latter causes the toothed
wheel to push the said segment outwards, and therefore forces the roller at the
upper end of the said lever against the other roller.
Parallel with the aforesaid shaft is placed a second shaft, on which an excentric
is so fixed as to be immediately under the said weighted arm.
By using a lever arm, as above specified, this second shaft can be turned to
lift the weighted arm by the said excentric, thus causing the rollers to separate
more or less, according to the extent the lever is pulled back.

page_text: The said lever arm or hand lever is provided with a spring catch, which fitting
into a segment holds the said lever arm in any desired position.
I employ cleaning brushes driven by small band wheels in the ordinary manner.
The roller on the lever is driven by a pulley, and the other roller by a wheel
in steps.
For flat grinding, the rollers are preferably run at the same speed, and chilled
rolls should be used.
For crushing corn, paper rollers running at different speeds are the best.
For grinding flour, quarry stone rollers, running at unequal speeds are the best;
bran skinning can also be effected with stone rollers.
The said paper rolls should be constructed in the following manner, that is to
say: A metal centre piece is provided with flanges and feathers to prevent the
turning of the paper on the centre. The sheets of paper being passed over the
centre piece are pressed together by hydraulic or other suitable power, and then
secured by screwing.