Improvements in or relating to Machines for Grinding Files and other Articles.
Year: 1899

page_text: Date of Application, 25th Apr., 1899-Accepted, 29th July, 1899
COMPLETE SPECIFICATION.
Improvements in or relating to Machines for Grinding Files and
other Articles.
I, HEINRICH KLEWER, Manufacturer, Heumarkt 2, Hanau o/M, Empire of
Germany, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement;-
-
The present invention relates to a machine, by means of which files, or other
articles, with flat or curved surfaces, may be ground. The articles to be worked
may be arranged vertically or horizontally and the parts may be so adjusted as to
take articles of any size.
These special properties the machine owes to its special construction: The work
holder can be set at an angle of 90°, and the guiding device for the same, which
is provided with springs which keep the object to be acted upon, constantly
pressed against the grind stone or other tool, is kept in a continuous steady
swinging motion, by means of two eccentric dises arranged at an angle of 180°
with relation to each other. When the article to be worked is arranged vertically,
the shaft of the eccentrics can be placed out of gear, and when the length of the
article to be operated upon is so great, that the lateral oscillations produced by
the eccentrics are no longer sufficient, an extensible pivotted lever, with adjust-
able centre is connected with the article or work support, which lever at its other
end is actuated by a disc set obliquely on a shaft, by which means, the lever may
be made to swing laterally to any desired extent.
In the accompanying drawing:-
Figure 1 is a longitudinal section, and
Figure 2 a horizontal section of a machine with the work held in a horizontal
position, whilst
Figure 3 is a side view, and
Figure 4 a plan view of the machine with the work arranged in the vertical
position.
On the bars or supports / of the frame ua carrier c can be moved towards the
grind-stone or similar tool by means of a rack or racks & and pinion or equiva-
lent device. On the carrier springs are provided in cylinders d which are
pivotted on the carrier so that they can move horizontally, which springs press
against extensions or plungers on the guiding device which is provided with
similar cylinders and springs cooperating with extensions or plungers of a shaft a
supporting the articles to be ground or worked in a holder f. The guiding
device 6 is caused to oscillate laterally by two adjustable eccentric discs or
cams e, arranged oppositely on their shaft. By means of these oscillations the
work pressed, by means of the springs within the cylinders against the tool is so
swung against the latter, that it is ground or worked in the curved shape
required. The work holder f is provided with an adjustable lever r, by means of
which the work s, in case the arched surface is to be also rounded off in a vertical
direction, can be turned in a horizontal position. The lever r is embraced by
the forked end g of the central lever p, the pivotal point of oscillation of which

page_text: may be adjustable and is provided at its rear end with two pins o between which
engages the disc n set obliquely on the shaft m. The object of this device is to
increase the extent of the oscillations of the article to be operated on, in case that
produced by the eccentrics should be insufficient for the size of the work.
When it is required to set the work vertically the eccentric shaft is put out of
gear and the pivotted centre lever removed, and the guide device fastened to
the slide c by means of screws. After taking off the work holder f, the corre-
spondingly shaped holder i Figure 3, is secured to the shaft a supported in bear-
ings which slide on the guide b, the said holder i being thus pressed against
the tool by means of the springs housed within the adjustable cylinders h.
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. A machine for grinding files and other articles in which the object to be
treated is pressed against the tool by the action of springs housed in pivotted
cylinders capable of moving horizontally which are caused to swing horizontally,
together with a guide device, such as b, by cams or eccentric discs, such as e,
arranged on a revoluble shaft, substantially as described.
2. In a machine of the kind described a pivotted lever such as 2, longitu-
dinally adjustable as regards its centre of oscillation and actuated by a disc set
obliquely in a shaft whereby the work holder can be oscillated substantially as
described.
:
3. In a machine of the kind described, means for operating upon the work in
the vertical position, comprising a holder such as 7, carrying the work, spring
cylinders such as h for pressing the work against the tool and a lever such as r
for turning the work holder, substantially as described.
4. The complete machine for grinding files and other articles, substantially as
described or illustrated in the accompanying drawings.
Dated this 25th day of April 1899.