IMPROVEMENTS IN GRINDING AND POLISHING MACHINES
Year: 1883

page_text: LETTERS PATENT to Hugo Sackur, Dr. ph. residing in Berlin, Prussia, German
Empire, for an Invention of "IMPROVEMENTS IN GRINDING AND POLISHING
MACHINES"
"
PROVISIONAL SPECIFICATION left by the said Hugo Sackur at the Office
of the Commissioners of Patents on the 12th October 1883.
HUGO SACKUB, Dr: ph: residing in Berlin, Prussia, German Empire, "IMPROVE-
MENTS IN GRINDING AND POLISHING MACHINES
My invention relates to machines for grinding and polishing plates of metal and
other articles with plane surfaces by means of a rotating disk, and the improvements
consist in the particular construction of the table for carrying the plate &c., and in
the mode of imparting the requisite motion thereto.
The table consists of three superposed parts. The lower part is arranged to slide
forward and backward on suitable ways parallel to the axis of the rotating disk,
and it is operated from the shaft of the disk by worm-wheel-gearing and crank-
motion, or other appropriate means. The middle part of the table is adjustable
vertically in respect to the lower part by the medium of two rotative nuts turning
in bearings in the said lower part and working on screws fixed to the middle part,
both nuts being provided with worm-wheels gearing with two worms keyed on a
common shaft, which can be rotated by hand. The vertical adjustment may,
however, also be obtained by other equivalent devices. In order to steady the
middle part and to keep it truly parallel to itself in all positions, it is preferably
provided with guide-bars sliding in sockets on the lower part.
The upper part of the table serving to attach thereto the article to be ground or
polished, is movable in a direction vertical to the axis of the rotating disk, on or
between parallel ways on the middle part of the table. Its motion is produced by
a screw. -spindle engaging with a nut fixed to the said upper part, and which screw
is operated automatically in any known manner by pall and ratchet-wheel, or other
equivalent device. The upper part is arranged to be easily removed from the table
and to be exchanged, and for this purpose it is preferably made to engage with the
actuating screw-spindle by means of one half of a nut only.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Hugo Sackur in the Patent Office on the 12th April 1884.
"
HUGO SACKUR, Dr. ph. residing in Berlin, Prussia, German Empire IMPROVE-
MENTS IN GRINDING AND POLISHING MACHINES
"
My invention relates to machines for grinding and polishing plates of metal and
other articles with plane surfaces by means of a rotating disk, and the improvements
consist in the particular construction of the table for carrying the plate, &c., and in
the mode of imparting the requisite motion thereto.
On the annexed sheet of drawings Fig. 1 is a front elevation of a machine
comprising my improvements. Fig. 2 is a sectional end-view thereof on line x y
of Fig. 1. Fig. 3 is a plan of the machine, and Fig. 4 a transverse section of the
table CC E.
The grinding or polishing disk A is secured to the end of the shaft B driven by
means of a strap and pulley. The plate F to be ground or polished is carried by a
table composed of three main parts C¹, C and E. The lower part C¹ consists in a
frame arranged to slide forward and backward on bars D, or other suitable ways,
parallel to the shaft B, and it is operated from the said shaft by worm-wheel-
gearing GH, crank I and connecting-rod K or by other appropriate mechanism.
The middle part of the table, or the frame C, is so connected to the lower part C¹
as to be vertically adjustable in respect thereto. The means for this adjustment
consist, according to the drawing, in the two screw-spindles e fixed to the transverse
bows on the part C, and in the nuts f turning in bearings in the part C¹ and
working on the screws e, and which can simultaneously be rotated by the shaft r
carrying the worms h that gear with the worm-wheels g formed upon the said
nuts f. In order to steady the part C and to keep it truly parallel to itself in all
positions, it is provided with guide-bars i sliding in sockets c¹¹ on the part C¹. By
this adjusting-device the plate F can be brought into proper contact with the disk A
and drawn away from it.
The upper part of the table serving to attach thereto the plate or other article F,
consists in a slide E, guided in a direction vertical to the axis of the disk A on or
between parallel ways on the part C of the table. This slide is slowly moved
forward as the work proceeds, by a screw-spindle engaging with a nut k on the
underside of the slide and operated automatically in any suitable manner, as, for
instance, by a lever n oscillated by any known means (not shown in the drawing)
and actuating the screw by a pall and ratchet-wheel m., The slide is, by preference,
a light iron frame with a top of wood covered with a thin plate of iron. It is
arranged to be easily removed from the machine and to be exchanged for another
one, and for this purpose it is preferably made to engage with the screw-spindle
by means of a half nut only.
For the purpose of securing the plate F to the slide E, clamps o may be employed
that are pressed down upon the plate by means of the cams p.
The arrangement of the described table may be modified by making the part or
frame C' stationary and providing it with the means for vertical adjustment, while
the part C is connected to the operating mechanism and is movable to and fro on
ways fixed to the part C'. Moreover, the vertical adjustment may be attained by
other means, as for instance by the employment of sliding pieces with inclined
surfaces acting in the manner of wedges on the part or parts to be raised and
lowered, and which pieces are combined with a screw or other medium for shifting
them simultaneously so as to produce the desired result and for keeping them in
position.

page_text: When thin and long sheets of metal are to be polished, it is advantageous to
replace the slide E by a cylinder adapted to carry the sheet. Or, the sheet attached
with one end to this cylinder, is allowed, while unrolling therefrom, to slide over a
plate arranged tangentially to the cylinder and so as to serve as support for the
sheet while being exposed to the action of the polishing disk.
Having thus described the nature and object of my invention and the manner in
which it is to be carried out in practice, I hereby claim as new and important
feature of the same :
In a grinding and polishing machine the combination with a rotating disk A, of
a work-table consisting of three superposed parts movable in respect to each other
substantially as described, and mechanisms for imparting to the parts of the table
such motion as that the upper part or slide E will be moved horizontally in two
different directions and for adjusting the table in vertical direction, as and for the
purpose specified.
In Witness whereof I the said Hugo Sackur have hereunto set my hand and
seal this thirty-first day of March in the year of our Lord One thousand eight
hundred and eighty-four.
SULATIO