Improvements in Apparatus for Excentric Cutting.
Year: 1893

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Excentric Cutting.
We CHRISTIAN WILHELM HECKMANN, OTTO HECKMANN and ERNST
HECKMANN, all of Barmen, Rhenish Prussia, Germany, Mechanical Engineers
and owners of the Firm of C. W. Heckmann Jr. 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 :--
This apparatus has for its object the shaping or cutting of excentric parts on
rotary working pieces and by it one is enabled to work such a piece in an ordinary
lathe or other suitable tool concentrically and excentrically at the same time
without requiring resetting.
The concentric working is done as usual; the cutting of the excentric parts is
done by means of a cutter.
On the accompanying drawing
Figure 1 gives a general view of this cutter with regard to the piece to be
worked upon;
Figures 2 and 3 are respectively a front view and a side view, partly in section
of one manner of arranging the device on a lathe;
Figures 4 and 5 show a modified arrangement in two similar views.
The cutter F is keyed excentrically to a spindle A; it rotates at the same
angular speed as the spindle S with the working piece W, consequently the cutter
shapes the said working piece according to a circular excentric when the turning of
the same and of the cutter takes place at the same angular speed and in the same
direction.
During the working the cutter is gradually approached to the working piece so
that the shaping is performed in a number of revolutions and not in a single
rotation. Figures 2, 3 and 4, 5 show two different mechanisms for carrying out
the said movements of the cutter and of the working piece. In both cases the
movement of the cutter F is caused indirectly by the turning of the spindle S
carrying the working piece W. A spur wheel H on the spindle S gearing into a
spurwheel L on a shaft B carried in the brackets M and N in bushes K. Between
the two vertical arms of the bracket N, the shaft B carries a spur wheel O gearing
into a similar wheel P on the spindle A of the cutter F.
Now in order to be able to move the cutter towards and from the working piece
the spindle A (Figs. 2 and 3) is mounted in a box shaped bracket or standard Q,
which again is carried on the bushes K of the shaft B and in the brackets N, so
that it can rock to and fro round the shaft B with the spindle A and its wheel P.
It is evident that the first motion needs not be necessarily given to the spindle S.
The device shown by Figures 4 and 5 differs from the preceding one only in the
manner of moving the cutter towards and from the spindle S holding the working
piece.
The transmission of the movements from the spindle S to the cutter spindle A is
done in exactly the same way as befor by the gear wheels H, L and O, P and the
intermediate shaft B. The bracket T carrying the spindle A. with the wheel P,
instead of being mounted so that it can rock to and fro on the shaft B is designed
as a sliding piece like the headstock of a lathe, sliding in dovetails on the
bracket U.
This arrangement does not allow as large a range of the way of the cutter as the
other, because the wheels O and P can get disengaged.

page_text: It will however not be difficult for the expert mechanic to design a device, by
the use of change wheels for instance, allowing a larger way for the cutter in this
arrangement.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed we declare that what
we claim is :
The arrangement for cutting excentric parts on a rotary working piece by giving
to the cutter the same angular speed as that of the working piece and approaching
the cutter gradually towards the said piece. The whole as set forth and as
*specified.
Dated this 30th day of November 1893.
CHRISTIAN WILHELM HECKMANN,
OTTO HECKMANN,
ERNST HECKMANN,
Per Karl J. Mayer,
Agent.