Improvements in Machines for the Manufacture of Revolving Cutters.
Year: 1893

page_text: Date of Application, 24th Aug., 1893-Accepted, 7th Oct., 1893
COMPLETE SPECIFICATION.
Improvements in Machines for the Manufacture of Revolving
Cutters.
I, JOHANNES GEORG REINECKER of Gablenz near Chemnitz in the Kingdom
of Saxony, German Empire, Engineer, do hereby declare the nature of said inven-
tion 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 the manufacture of revolving cutters
such as are used for working metal, wood, stone, leather and other like material,
and which tools are commonly designed to cut such material in profile.
The object of my invention is to overcome the difficulties at present experienced
in the manufacture of the said tools which difficulties result from the necessity
of cutting or "backing off" the tools on the whole of their breadth at once.
This can, at present, only be done by means of very expensive tools operated by
heavy machines and even in this case, only such tools can be produced which have
no spiral or twisted grooves.
Tools with twisted or spiral grooves, nevertheless, have a great advantage over
those with straight grooves, especially in the case of cutters of considerable
breadth, for the reason that they produce a more accurate surface, and offer less
resistance and therefore require less power to drive them.
I attain these objects by the mechanism illustrated in the accompanying drawing
in which,
Figure 1 is a vertical cross section of a turning-lathe provided with the
improvements constituting my invention;
Figure 2 is a plan of the machine,
Figure 3 is a side view in part, and
Figure 4 is a detail view of a cam hereinafter described.
Similar letters refer to similar parts throughout the several views.
A represents the bed of a turning lathe, upon which is mounted a slide-rest I,
provided with a hub l', bored out so as to form a bearing for a spindle b, a suitable
lining being preferably inserted between the spindle and the said hub A. The said
spindle is provided on one end with a pinion a engaging with a pinion a¹ fixed upon
the driving shaft a, and on the other end is secured a cam c, the form or shape of
which is clearly seen in the detail view, Figure 4.
A plate is secured upon the slide-rest by means of screw bolts 13 and
forms a sliding bed for a slide e which moves in a transverse direction to the slide
rest .
The slide e on its lower side at one extremity carries a pin and is provided at
its opposite extremity with a projection e¹. One or more springs f arranged
in recesses in the plate and pressing against a screw bolt e³, carried by
the said projection of the slide e, tend to press the pin d against the surface
of the cam c.
On rotating this cam c in the direction of the arrow shown in Figure 4 the
slide e is alternately moved forward by the cam and brought back again by the
action of the springs f; this movement being timed in such a manner that for
each revolution of the blank (from which the tool is to be produced) the cam c
makes a number of revolutions corresponding to the number of teeth to be formed
on the said blank, during one revolution of the latter.
A plate y is fixed on the slide e by means of set screws g'g', and is provided
with an extension 92 which has formed therein grooves for receiving a blade h
carrying the former i. Lateral guides k k secured to the frame A, project upward
and are so arranged as to allow the said blade to move only in a transverse

page_text: direction. Upon the said plate g rests a sliding plate m capable of being adjusted
by springs m' and set screws m² passing through the projection on the plate g, the
said plate m having secured thereto the follower or guiding pin n which is arranged
on the same level as and engages with a former i, the said follower n being con-
stantly pressed against the former i by the springs m¹. To the plate m is attached
the tool holder o which may be adjusted thereon by set screw o¹ the said tool
holder carrying the turning tool p which is secured thereto by set screws o² and
formed at its operating end of the same shape as the follower n. Screw o is for
feeding forward the cutter (Fig. 1).
The operation of the improved machine is as follows:-The shaft a being
revolved the cam c is moved around its axis (see Figure 4) and, by reason of its
co-operation with the pin d, a reciprocating motion is imparted to the slide e, plate g,
blade h, former i as well as plate m, follower n, head o and tool p. This constitutes
the so called relieving or "backing off" motion.
In this
If during the said motion, the slide rest is moved longitudinally, by the ordinary
well known operating devices, the slide e, plate g, plate m, follower n, head o and
turning tool p are caused to partake in this motion, but the blade h and former i,
are by means of the guide arms k, prevented from following this motion.
way the follower n is caused to slide along the former i and in consequence thereof,
the turning-tool p, performing a motion similar to that of the follower n, will
produce a cutter which will conform in shape to that of the former i. If a tool
with straight grooves arranged parallel to the axis is to be produced, the cam c
must accurately perform as many revolutions as there are teeth to be cut on the
blank; but if tools with spiral or twisted grooves or flutes wound in a right or left
handed direction are to be produced, then the movement of the shaft a driving the
cam c must either be retarded or accelerated. This being performed in a manner
and by means well known to those skilled in the art, no further explanation is
needed.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :
1. In a machine for making revolving cutters, the combination of the slide
rest carrying slide e and adjustable plate m having the follower n and turning
tool p secured thereto, with blade and former i guided by arms k, k fixed to the
frame of the machine and means for imparting a reciprocating motion to the
slide e and its accessory parts, substantially as and for the purpose described.
2. The combination, in a machine for making revolving cutters, of the former i
with a blade embedded in plate g, 92 secured to the reciprocating slide e and fixed
arms k, k guiding the said blade in transverse direction essentially as and for the
purpose specified.
3. The combination of the bed A, slide rest 1, plate 12 secured thereto, slide e
adapted to move in guides on said plate 2 pin d secured to slide e a cam c adapted
to engage with pin d and maintained in contact therewith by springs in
operative connection with the slide e the tool holder o connected with slide e and
means for limiting the travel of said holder, substantially as set forth.
4. The combination of the bed A slide rest, plate 12, slide e provided with a
pin d which engages with a cam c the plate g secured to slide e, blade / provided
with a former i guides kk for said blade fixed to the bed A and the adjustable
plate m connected to plate g by springs m¹ and screws m² and provided with a
follower n and tool holder o operating as and for the purpose specified.
Dated the 24th day of August 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.