Improvements in Machines for Grinding and Polisning seet Metal of any desired Length, with Self-acting Longitudinal
Year: 1885

page_text: Improvements in Machines for Grinding and Polisning seet
Metal of any desired Length, with Self-acting Longitudinal
I FRIEDRICH RAUBER of the town of Elbnig in the Kingdom of Prussia and
German Empire, Manufacturer, do hereby declare the nature of my Invention for
IMPROVEMENTS IN MACHINES FOR GRINDING AND POLISHING SHEET METAL OF
ANY DESIRED LENGTH WITH SELFACTING LONGITUDINAL AND LATERAL MOVEMENT
OF THE SHEET 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 by which the operation of
grinding and polishing or burnishing sheet metal can be carried out to perfection
in a continuous operation.
By the action of a new and peculiarly arranged agitating or shaking mechanism,
a longitudinal as well as a lateral motion can be imparted to the sheet metal,
whereby a. perfect polish is produced and streaks and scratches are completely
avoided which obviates the necessity of finishing the polishing operation by hand
which has been found necessary with all other machines of this kind up to the
present, and consequently the working capacity of my machine is thereby very
considerably increased.
In the accompanying drawings
Figure 1 is a side view.
Figure 2 is a top view, and
Figure 3 a front view of my improved machine, the principal parts of which
consist of the driving gear A and the polishing and burnishing machine proper B,
which said driving gear consists of the two standards a a the shaft b, of a fixed
and a loose strap drum c c, a large strap drum d, a small drum e and the
excenter f.
The polishing machine B consists of the wooden frame g with wooden table h,
the two standards i i, the grinding, polishing or burnishing roller k, the iron
counter roller l, the spanning or tension device m with its three spiral springs, the
gearing n with the rope drum o, the rope with the clutch q and the agitating or
shaking mechanism cc. The starting of the machine is effected by means of the belt

page_text: shifter 2 which is attached to the driving gear A, the shaft of which has to make
about 200 revolutions per minute. The grinding polishing or burnishing roller k
is rotated by the belt on the strap drum d, while at the same time the gearing n is
set in motion by the belt or strap of the strap drum e in consequence of which the
rope q is wound up upon the rope drum o, while the clutch attached to the said
rope, pulls the sheet metal which is in the act of being polished, under the polishing
roller in the desired direction.
If the sheet metal is to be passed under the roller k in contrary direction the
rope drum o is uncoupled by means of the uncoupling device y, when the polishing
roller will automatically pull the metal sheet back again which latter can freely
move upon the guide roller 7.
In order to prevent the metal sheet from recoiling, the rope drum o is provided
with the brake r, which can be regulated by means of a spiral spring according to
requirement while the treadler will permit a slower or quicker transportation of
the sheet metal as may be desired.
In order to effect the forward movement of the sheet metal the rope drum o is
again coupled; while the lateral movement of the said metal sheet is effected by
the action of the agitating or reciprocating mechanism x.
By means of the excenter rod t, connection is made between the excenter f of
the driving gear A, and the bell-crank lever x, which latter is connected to the
table h by the screw 8, whereby a lateral movement is imparted to the said table
when the machine is in operation.
The fulcrum of the table is formed by the pin v.
Beneath the table h is the
tension device m, for the purpose of regulating the pressure of the metal sheets
against the grinding, polishing .or burnishing roller. This said tension device
consists of three perpendicular bolts having each a spiral spring applied around the
same which can be adjusted by screwing a suitable nut up or down.
In order to facilitate the lateral movement of the table h, the bolts of the tension
device m, are provided with appropriate rollers which press against the said table.
When the requisite tension is attained and a metal sheet is to be inserted it will
only be necessary to pull the table downwards by means of the treadle lever w,
push the metal sheet through under the grinding polishing or burnishing roller, and
apply the clutch q. In front of the driving gear A is another table for the support
of the sheet metal which has to undergo the polishing operation as shown in
figures 1 and 2 of the accompanying drawings.
As novel and peculiar features of my invention I must point out the agitating
or reciprocating device which imparts a lateral movement to the sheet metal
operated upon, and the brake or friction mechanism r, by means of which the
forward and backward transportation of the sheet metal can be effected.
It is evident from the foregoing specification and the accompanying drawings
that my said invention can be modified in various manners without departing from
the tenor of my invention.
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
In a machine for grinding polishing or burnishing sheet metal in which the
metal to be ground polished or burnished is pulled or drawn through between a
rotating grinding polishing or burnishing roller k and a guide roller l placed under
the former by means of a suitable rope or chain.
1. The arrangement construction and employment of the said guide roller / upon
a table h, which latter is rapidly reciprocated in a lateral direction with the said
guide roller by means of a suitable rod or rods and bell crank lever or levers, con-
nected with the main driving shaft and which said table is supported at the other
end by means of a suitable pivot substantially as and for the purpose described in
the foregoing specification and shown in the accompanying drawings.

page_text: 2. The device or arrangement for uncoupling the rope or chain drum o, from the
sheet of metal after the same has completed its stroke, passage or traverse in one
direction, and the arrangement employment and application of a brake r, whereby
the said rope or chain drum is turned in an opposite direction to the previous
traverse of the sheet of metal which now follows the strain or tension of the
grinding polishing or burnishing roller so that the metal plate is caused to travel
back again id est in opposite direction to the direction in which the sheet moves
when the coupling is in gear substantially as described and shown in the accom-
panying drawings.