Improvements in Attachments for Screw-machines or Automatic Lathes.
Year: 1899

page_text: COMPLETE SPECIFICATION.
Improvements in Attachments for Screw-machines or Automatic
Lathes.
I, EMIL BOMMER, of 257 to 271, Classon Avenue, in the City of New York,
Borough of Brooklyn and State of New York, U.S.A., Manufacturer, 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 attachments for screw-machines, whether operated
by hand or automatically, by which, with each full rotation of the tool-stock, as
many nipples, or "tips" of spherical or conical shape (such as are known as.
ball-tips" and cones") or other similarly shaped articles may be made and
completely finished as there are tools of the same kind arranged in the tool-stock,.
said nipples, ball-tips, cones or other articles being made from a metallic rod.
which is automatically fed forward and subjected to the action of the operating-
tools supported respectively by the improved attachment,, the tool-stock and
the slide-rest, so that the screw-machine is adapted to turn out special articles
to be made thereon' in a quicker and more effective manner than with the screw-
machines heretofore in use, in which only one article can be made for each full
rotation of the tool-stock.
For this purpose this invention consists in the combination, with a screw-.
machine, or automatic lathe of a curved arm supported parallel with the work-
holder and provided with an eye-shaped end or terminal, a centering-sleeve,.
and means for holding a tool inserted in said sleeve, said centering-sleeve, work-
holder and tool being in axial alignment with each other. The invention consists.
further of the centering-sleeve in the curved arm provided with stop-pins or
projections on the side facing the metallic rod from. which the articles are made,
and of a tubular scoring-tool that is guided in the centering-sleeve and provided
with an exterior shoulder at the end facing the tool-holder, said tubular scoring-
tool being engaged by a spring and moved forward at the proper time against
the tension of the spring by the action of the tool-holder for operating on the.
face of the blank. The invention consists further of certain details of construction.
by which the successive operations of the operating-tools are accomplished, as:
will be fully described hereinafter and finally pointed out in the claims.
In the accompanying drawings,
Fig. 1 represents a plan view of the attachment for screw-machines, shown
as applied to an automatic screw-machine.
Fig. 2 is an end-elevation of a portion of the machine, shown in Fig. 1, drawn
on a larger scale so as to show the operating-tools more distinctly.
Fig. 3 is a side elevation of the attachment, partly in vertical section through
the supports of the same.
Fig. 4 is a side elevation of the lower part of the attachment, drawn on a
larger scale.

page_text: Figs. 5 and 6 are a vertical longitudinal section and a vertical transverse
section respectively on lines 5-5, Fig. 6, and 6-6, Fig. 4.
Figs. and 8 are respectively a vertical longitudinal section and an end-
elevation of the lower part of the attachment; showing the same without a
tubular cutting tool, and.
Fig. 9 is a vertical central section of a ball-tip or similar article made by
this attachment for screw-machines.
Similar letters of reference indicate corresponding parts.
Referring to the drawings, A represents the work-holder of a hand or auto-
matic screw-machine, and A* a chuck at the end of the same. The work-
holder A is guided in a tubular axle and rotated by a belt and pulley in the
usual manner. The work-holder A is intermittently fed forward by means of
a clutch-arrangement A' and by means of cams A² located on the cam-shaft S
of the machine, said cams being provided with as many projections on their
circumferences as are required for producing the forward motion of the metallic
rod a in the work-holder as many times for each full rotation of the cam-shaft
as there are tools in the tool-stock. The clutch A¹ and its operating mechanisms
used for this purpose are well known and require therefore no special description.
The tool-stock B is advantageously of a cylindrical cross-section and mounted
upon a horizontal shaft b, which is supported in the stationary frame-work of
the machine and arranged opposite to and in line with the work-holder. The
tool-stock B serves to support a number of tools of the same kind, their number
corresponding to the number of nipples, ball-tips, cones or other articles which
it is desired to produce at each full rotation of the cam-shaft. The tool-stock
of the screw-machine shown in the drawings is in this instance arranged for
five drilling-tools which are secured in as many sockets arranged on the face of
the tool-stock. The actuating-cam B on the cam-shaft S and the transmitting
mechanisms for imparting motion to the tool-stock B, are so arranged and timed
that five articles can be made for each full rotation of the cam-shaft, and tool-
stock. Below the chuck A of the work-holder A is arranged a laterally-
reciprocating slide-rest C, which carries at one side of its centre-line the forming-
tool and at the opposite side of the same the cutting-off tool C³.
slide-rest C is operated by cams C³ on the cam-shaft and the usual motion-
transmitting mechanism, shown in Fig. 1, so as to be reciprocated five times
for each full rotation of the cam-shaft.
The
In front of the work-holder and intermediately between the end of the same
and the tool-stock, is interposed a curved arm D, the shank 1) of which is
supported parallel with the work-holder in suitable bearings of an auxiliary
support D2, the pillars of which are in this instance shown attached by screw-
bolts to the supports of the tubular axle in which the work-holder A is sup-
ported. The shank D' of the curved arm D is made with square portions.d as
far as it is located in the bearings d2, which bearings are correspondingly shaped
so as to secure the shank of the curved arm rigidly in position. Adjacent to
the square portions 3 of the shank D are arranged screw-threaded portions (+
to which are applied jam-nuts d³ which are screwed up against the outer faces
of the bearings 2 and which permit the adjustment of the curved arm D to
the required position relatively to the work-holder and tool-stock, and the rigid
support of the same after the proper adjustment has been made. The end of
the curved arm D is made with an eye-shaped terminal d which is bored out so
as to support a centering-sleeve E, that is firmly secured to the eye-shaped
terminal of the arm D by means of a set-screw e, which engages a depression in
the circumference of the centering-sleeve E, as shown in Fig. 6. The centering-
sleeve E is provided at the end facing the work-holder with one or more stop-
pins or projections e¹ which serve to arrest the metallic rod as the same is fed
forward in the work-holder. The stop-pins or projections e¹ are secured into
sockets of the centering-sleeve E of the eye-shaped end of the arm D or are
made integral with said centering-sleeve. In the centering-sleeve E is arranged

page_text: a tubular scoring-tool F which is guided by means of a lug f in a longitudinal
slot f of the centering-sleeve E, as shown in Fig. 5. The cutting-edge of the
scoring-tool F is located adjacent to the work-holder, while the opposite end is
provided with a shoulder f which is engaged by the free recessed end of a flat
spring F, which is attached at its upper end to the arm D) and which serves to
hold the tubular scoring-tool in normal position so that its cutting-edge is
located inside of the ends of the stop-pins or projections e¹, as shown in Figs. 4
and 5. The tubular scoring-tool F is only used when the bottom of the article
to be produced has to be provided with a depression, as shown in Fig. 9. There
are numerous articles which can be made by my improved attachment, in which
this scoring is not required; and the scoring-tool is in such cases dispensed
with and the end of the curved arm. only provided with the centering-sleeve E,
having stop-pins or projections e, as shown in Figs. 7 and 8.
When the curved arm D with its centering-sleeve E is applied to an ordinary
hand or automatic screw-machine, a separate spotting-tool for centering. for the
point of the drill a separate stop-tool for stopping the blank, and a separate
scoring-tool, in case a depression is desired on the face of the blank, are not
required in the tool-stock. As all these separate operations are performed almost
simultaneously by the use of my attachment, it appears that the functions of
the above-mentioned tools are transferred from the tool-stock to the centering-
sleeve and its scoring-tool, supported by the curved arm, and the special tools
which were heretofore required in the tool-stock for these purposes are dispensed
with so that the tool-stock can be used exclusively for carrying tools of the same
kind, permitting thereby the machine to make for each full rotation of the cam-
shaft and tool-stock as many articles as there are tools in the tool-stock, while
heretofore only one separate article could be made for every full rotation of the
cam-shaft. This gives the additional advantage that each tool in the tool-stock,
after having entirely completed a nipple ball-tip, cone or other article, is out
of action and has time to cool off before its turn comes again after the com-
pletion of a full rotation of the tool-stock, and greatly reduces the wear on the
imachine as idle movements of the tool-stock are entirely avoided and the time'
necessary for completing a nipple, ball-tip, cone or other article is shortened and
the wear on all the mechanisms of the machine correspondingly decreased.
The operation is as follows:-
:―
The metallic rod or blank in the work-holder is first fed forward by the clutch
and feed-device as the same is actuated by the cams on the cam-shaft until the
end of the metallic rod abuts against the stop-pins or projections of the cen-
tering-sleeve. The tool-stock is then moved forward so that one of its tools'
passes through the centering-sleeve and operates on the end of the rotating rod,
from which the nipple, ball-tip, cone or other article is to be made. During
the drilling action of the tool, it is guided in the centering-sleeve, while the
end of the metallic rod is held in contact with the stop-pins or projections on
the centering-sleeve. During the drilling operation the slide-rest has been
moved towards the end of the metallic rod so that the forming tool acts thereon
and imparts the proper exterior shape to the blank. As soon as the drilling and
forming tools have performed their work on the blank, the slide-rest is moved
backward, and the tool-stock with its drilling-tool is withdrawn, and the cutting-
tool applied to the blank so as to cut it off from the metallic rod. The shavings
formed by the drilling-tools during the action of the same are moved along the
stationary stop-pins or projections of the centering-sleeve of the curved arm, so
that they clear the end of the centering-sleeve and are finally dropped into a
trough located below the operating tools of the machine.
When the scoring-tool is used in connection with the centering-sleeve, as
shown in Figs. 4 to 6, the centering-sleeve with the scoring-tool is inserted into
the eye-shaped end of the curved arm D. When the scoring-tool is brought
into action. it is moved forward by the pressure of the tool-socket in the tool-
stock against the tension of the spring 1" towards. the face of the metallic rod,
;

page_text: which is rotating in contact with the stop-pins, so as to produce the desired
scoring, until its shoulder and spring are arrested by the completion of the stroke
of the tool in the tool-stock. The length of the stop-pins or projections and
the distance for which the scoring-tool is moved forward, are so proportioned
that the desired depth of scoring on the article is produced in this manner dis-
pensing with the use of the stopping-tool spotting-tool and scoring-tool in the
tool-stock, and permitting the completion of as many pieces as there are tools
in the tool-stock, for each full rotation of the cam-shaft.
The advantages of this attachment for screw machines as compared to the screw-
machines heretofore in use are as follows:-
Firstly, it permits the turning out of as many finished pieces for each full.
rotation of the cam-shaft, as there are tools in the tool-stock, while heretofore
only one article could be produced for each full rotation of the tool-stock, for
the reason that the tools in the tool-stock had to be brought successively into
action. This is obviated by the arrangement of the curved arm, with its cen-
tering-sleeve, stop-pins or projections, and scoring-tool, which arrangement not
only saves several operations but also increases the output of the machine and
reduces the wear on all its mechanisms. Secondly, the articles produced are
made with greater accuracy; for the reason that the tools in the tool-holder are
guided and centered close to their entrance into the blank, whereby vibration
or springing and breaking of the drilling-tools are reduced to the minimum,
while the scoring-tool serves to form a cavity on the face of the blank where,
such is desired, the functions of the stopping-tool centering-tool and scoring-
tool being in our attachment transferred from the tool-stock to the centering-
sleeve supported in the curved arm. Thirdly, this attachment can be applied
to any of the automatic screw machines in use, as the support for the curved
arm can be readily superposed and attached to the bearings of the tubular axle
in which the work-holder is supported, while the cams can be readily changed so
as to produce the motions which are required by the operating-tools during each,
rotation of the cam-shaft, while for hand machines no changes in the mechanism
of the tool-holder, nor in the mechanism of the work-holder, are necessary.
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 attachments for screw-machines or automatic lathes, the combination
of a curved arm supported parallel with the work-holder and provided with an
eye-shaped end or terminal, a centering-sleeve, and means for holding a tool
inserted in said sleeve, said centering-sleeve, work-holder and tool being in axial
alignment with each other, substantially as set forth.
2. In attachments for screw-machines or automatic lathes, the combination.
of a curved arm supported parallel with the work-holder and provided with an
eye-shaped end or terminal, a centering-sleeve supported in said terminal, and.
a tubular spring-actuated scoring-tool guided in said sleeve, substantially as set.
forth.
3. In attachments for screw-machines or automatic lathes, the combination.
of a curved arm supported parallel with the work-holder and provided with an
eye-shaped end or terminal, and a centering-sleeve supported in said terminal
and provided with stop-pins or projections on the face of said centering-sleeve,.
substantially as set forth.
4. An attachment for screw-machines or automatic lathes, consisting of a
curved arm having an eye-shaped end or terminal, the shank of said arm being
supported parallel with the work-holder, a centering-sleeve supported in said
terminal, and a tubular and spring-actuated scoring-tool guided in said centering-
sleeve substantially as set forth.
5. An attachment for screw-machines or automatic lathes, consisting of a
curved arm having an eye-shaped end or terminal, the shank of said arm being.

page_text: supported parallel with the work-holder of the machine, and a centering-sleeve
supported in said terminal and provided with stop-pins or projections on the
face adjacent to the work-holder, substantially as set forth.
6. The combination, with the work-holder, tool-stock and slide-rest of a
screw-machine or automatic lathe, of a curved arm, the shank of which is sup-
ported parallel to said work-holder, said arm having an eye-shaped end or
terminal, a centering-sleeve in said terminal provided with stop-pins or projec-
tions, a scoring-tool in said centering-sleeve, mechanism for intermittently
feeding the metallic rod in the work-holder, and mechanism for intermittently
rotating and reciprocating the tool-stock and reciprocating the slide-rest so as
to apply one after the other to the blank, substantially as set forth.
7. In attachments for screw-machines or automatic lathes, the combination
of a curved arm supported parallel with the work-holder, said arm having an
eye-shaped end or terminal, a centering-sleeve in said terminal having stop-pins
or projections on the face adjacent to the work-holder, and a tubular scoring-
tool in said centering-sleeve, and a rotary tool-stock, having a number of tools
of the same kind, substantially as set forth.
8. In attachments for screw-machines or automatic lathes, the combination
of a curved arm supported parallel with the work-holder, said arm having an
eye-shaped end or terminal, a centering-sleeve in said terminal having stop-pins
or projections on the face adjacent to the work-holder, a tubular scoring-tool
in said centering-sleeve a tool-stock having a number of tools of the same kind,
and mechanism for actuating said tool-stock so that one full reciprocation is
made for each feeding action of the work-holder and each reciprocating action
of the slide-rest, but only such fractional part of a full rotation equal to a full
rotation divided by the number of tools in the tool-stock, substantially as set
forth.
Dated this 14th day of September 1899.
TONGUE & BIRKBECK,
31, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.