An Automatic Drilling Machine with Means for Automatically Feeding the Piece Operated on.
Year: 1898

page_text: Date of Application, 4th Mar., 1898
Complete Specification Left, 5th Dec., 1898-Accepted, 11th Feb.. 1899
An Automatic Drilling Machine with Means for Automatically
Feeding the Piece Operated on.
I, ABEL BUG, of 239, Friedrichstrasse, Berlin, Germany, Engineer, do hereby
declare the nature of this invention to be as follows:-
This invention relates to a drilling machine which is specially applicable for auto-
matically and at great speed drilling small holes close to each other at like or
periodically changing distances, as for instance desirable in the manufacture of meta
combs where the comb back is to be provided with a number of holes for receiving
the teeth of which one part are closer to each other than the other part.
one
end receives
The machine is suitably made with a horizontal drill spindle which at
which at the other end is pressed
the drill, and
drill spindle forward during its
upon by a spindle which pushes the
rotation. The drill spindle is provided with a helical spring which counteracts
the forward pushing direction of the drill spindle and tends to push it back.
pressing spindle is provided with a similar spring which tends to push back the .
pressing spindle.
The
The pressing spindle and thereby also the drill spindle are pushed forward auto-
matically by a finger arranged to slide on a guide on the headstock. This finger is
vertically above a screw thread formed in the boss of a gut pulley keyed on the
pressing spindle. This pulley rotates the pressing spindle. When the finger is made
to engage with the screw thread which is done by a stop peg fixed in the side of the
pulley, the latter is pushed forward along with the pressing spindle. But when the
finger is thrown out of gear with the screw thread, which is done by another stop on
the pulley, the pressing spindle as well as the drill spindle are thrown back by the
action of their springs.
The feed of the "work" or the piece operated upon is produced by two rollers
between which the work (for instance the back of a comb) is clamped and which are
intermittently rotated by tooth wheel gearing from a spindle. This latter is turned
intermittently by pawl gear actuated from a gut pulley on the pressing spindle at
each revolution of the latter. The pawl wheel is on the spindle which carries the
feed rollers. The periphery of the latter is as great as the sum of all the distances
between the holes in one group of holes to be drilled; and the pawl wheel has as
The tooth pitch of the pawl wheel
many teeth as there are holes in the group.
As the holes in one
corresponds with the distance between the holes in the group.
group are to be spaced differently the pitch of the teeth of the pawl wheel is also
varied. The different tooth distances require different strokes of the pawl lever the
pawl of which takes into the pawl wheel.
The pawl lever is by each revolution of the pulley on the pressing spindle lifted
by a peg on the side of said pulley and then dropped. The stroke of the pawl lever
is therefore limited above but it is made variable by placing the point of support for
the pawl lever higher or lower, so that the carrier peg on the pulley takes hold of
the pawl lever later or sooner. For this purpose the said point of support for the
mami lavar is arranged movable.

page_text: This may be done by a lever provided with as many set offs of different height for
the pawl lever to rest upon as the pawl wheel has different tooth pitches. This lever
is operated by a cam on the pawl wheel spindle, a spring holding it up against
the cam.
Dated this wourth day of March 1900
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.
An Automatic Drilling Machine with Means for Automatically
Feeding the Piece Operated on.
I, ABEL BUG, of 239, Friedrichstrasse, Berlin, Germany, Engineer, 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 invention relates to a drilling machine which is specially applicable for
automatically and at great speed drilling small holes close to each other at like or
periodically changing distances, as for instance desirable in the manufacture of metal
combs where the comb back is to be provided with a number of holes for receiving
the teeth of which one part are closer to each other than the other part. Heretofore
in drilling such holes the rotating drill spindle was pushed forward by means of a
lever operated by the hand and when the hole was finished the lever was again pulled
back by hand in order that the "work" fixed in a clamp might be shifted. The
drilling machine according to the present invention performs these operations
automatically.
Fig. 1 is a side view and Fig. 2 an end view of the machine; Fig. 2 is an end view
of the back centre. Fig. 3 is a detail view of tooth wheel gearing. Fig. 4 is plan
of the machine, Fig. 5 side view of the driving gear, Fig. 6 end view of same, and
Fig. 7 plan view.
The machine is suitably made with a horizontal drill spindle which is provided
with strap pulley d³ and at one end receives the chuck d² with the drill and which
at the other end is pressed upon by a spindle f which pushes the drill spindle d
forward during its rotation. The drill spindle works in bearings on the standard e and
is provided with a helical spring d which counteracts the forward pushing direction
of the drill spindle and tends to push it back. The rear end of the drill spindle has
a recess which receives the hardened steel point f¹ of the pressing spindle f. The
latter is provided with a spring f which tends to push back the pressing spindle f
The standard a has two blocks a² in vertical guides a¹ for guiding the "work," in
this case a piece of wire a to form the back of a wire comb in the right position to
the drill d', by means of the clamping bolts ³.
The pressing spindle and thereby also the drill spindle are pushed forward
automatically by a finger arranged on a slide i working in a guide g¹ on the
.headstock I
but with sufficient friction to remain in the position to which it may be
raised. The finger is vertically above a screw thread formed in the boss of a
gut pulley h keyed on the pressing spindle f. The speed of rotation of the pulley h
may suitably be such that the spindle makes 1 revolution for 100 revolutions of
the drill spindle . Figs. 5, 6 and 7 shew suitable arrangements for this purpose.
When the finger i is made to engage with the screw thread in which is done by a
stop peg h³ fixed in the side of the pulley h, the latter is pushed forward along with
the pressing spindle. But when the finger ¹ is thrown out of gear with the screw
thread in, which is done by another stop 2 on the pulley h, the pressing spindle
as well as the drill spindle d are thrown back by the action of their springs f² and d.
The stop h³ acting on a wedge serves to depress the slide i, and the stop h²
acting on the wedge serves to raise the slide .

page_text: The feed of the "work" of the piece operated upon between the guides a² a² on the
standard a is produced by two rollers as a between which the work (for instance the
piece a which is to form the back of a comb) is nipped and which are intermittently
rotated by toothed wheel gearing bb from a spindle & Figs. 2 and 3. Only the upper
feed roller a needs to be adjustable. This can be done by means of a bolt b¹ with
nut 62 and a slot in the standard c Fig. 4. The spindle is turned intermittently by
pawl gear, the pawl lever m² being actuated by a peg ht on the gut pulley h on the
pressing spindle fat each revolution of the latter. The pawl wheel m is on the
spindle which carries the lower feed roller c. The periphery of the feed rollers
a³ a³ is as great as the sum of all the distances between the holes in one group of
holes to be drilled; and the pawl wheel m has as many teeth as there are holes in
the group. The tooth pitch of the pawl wheel corresponds with the distance between
the holes in the group. As the holes in one group are to be spaced differently the pitch
of the teeth of the pawl wheel m is also varied as will be seen in Fig. 2. The different
tooth distances require different strokes of the pawl lever m², the pawl m¹ of which
takes into the pawl wheel m.
For
The pawl lever m² is by each revolution of the pulley on the pressing spindle
lifted by the peg ht on the side of said pulley and then drops by reason of its own
weight. The stroke of the pawl lever m² is therefore limited above, but it is made
variable by placing the point of support for the pawl lever higher or lower, so that the
carrier peg on the pulley / takes hold of the pawl lever m² later or sooner.
this purpose the said point of support for the pawl lever is arranged movable. This
support inay as here shewn be formed by a lever n pivoted at and provided with
set offs n³n n of different height for the small roller ³ of the pawl lever m² to rest
upon. This lever is operated by a cam o on the pawl wheel spindle k, a spring n
holding it up against the cam o. In the present example the "work" which is to
form the back of a wire comb is to be provided with groups of 13 holes each, in
such manner that the first 8 holes are to be equidistant, but the distance of the
ninth hole from the eighth, tenth from the ninth, the eleventh from the tenth,
the twelfth from the eleventh and the thirteenth from the twelfth is to be
Inore, while the first hole of the next following group is to have double the distance
from the thirteenth hole of the first named group as compared with the mutual
distance of the first eight holes. Hence the diameter of each feed roller a is to be
such, that the circumference equals the sum of all the hole distances of a group of
holes and the pawl wheel m from which the feed rollers derive their motion must
have as many teeth (in the present case 13) as the group of holes has teeth. The
distance between the teeth answers to the distance of the holes in the group of holes.
The different distances of the teeth in the pawl wheel or different lengths of these
teeth require again a different lift stroke of the pawl lever 1.2. Towards the top the
stroke is always limited as shown in Fig. 2 by the position of the stop or roller peg h
in the pulley h. Therefore a change in the lift stroke of the pawl lever will depend
upon whether the stop ht catches the said lever earlier or later in order to carry it up
to its highest position. The three set offs n³ n4 and n' thus answer to the highest,
middle, and lowest set off in the cam o.
The position of the cam o depends upon the position of the pawl wheel m in such
manner that the arm n abuts against the highest set off on the cam o, the highest
set off 3 on the lever serving to support the roller m³ on the pawl lever as long as
the pawl ml engages with the teeth spaced closest. In the position shown in Figure 2
the nose or set off n³ on the lever has come against the second set off of the cam o,
so that in the further working of the machine the set off n* will serve for support to
the roller m³ on the pawl lever m².
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. In a drilling machine provided with a drill spindle influenced by a forwardly
Dressing enindle the unl

page_text: the pressing spindle and so influenced by stops rotating with the pressing spindle
that it is alternately put into and out of gear with a screw thread on the pressing
spindle and thereby the pressing spindle and with it also the drill spindle are auto-
mmatically pushed forward during each revolution of the pressing spindle and then
quickly recede.
2. In a drilling machine provided with a drill spindle influenced by a forwardly
pressing spindle the application and use of a pawl wheel and a pawl lever actuated
from the pressing spindle and operating the feed rollers for the work.
3. In a drilling machine provided with a drill spindle influenced by a forwardly
pressing spindle the application and use of variable feed gear in which the pawl wheel
is provided with teeth of different pitch, while the lift of the pawl lever actuated
from the pressing spindle is varied automatically corresponding to the pitch of the
pawl wheel.
4. The construction of gear for the automatic endwise movements of the pressing
spindle as described with reference to the drawings.
5. The construction of the means for actuating the feed gear from the pressing
spindle, as described with reference to the drawings.
6. The construction of automatic variable feed gear, as described with reference to
the drawings.
7. The construction of automatic drilling machine shown in the drawings.
Dated this Fifth day of December 1898.
ecember
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.