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Патент USA US3019520

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Feb- 6, 1962
c. A. BlscHol-F
3,019,510
MULTIPLE-SPINDLE AUTOMATIC v'Lßxrmss
Filed May 24, 1960
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States Patent
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3,019,5lil
Patented Feb. 6, 1962
2
the number of spindles on the revolving head. Each stop
s 019 51
carrying member is stepwise rotated synchronously with
Charles Albert Bischoff, Paris, France, assigner to So
cíete des Etablissements Malicet & Blin, Aubervilliers,
the revolving head so as to bring each stop in turn in axial
MULTIPLE-Spinnin ÁU'roMATIC LATrras
France
Filed May 24, 1960, Ser. No. 31,449
Claims priority, application France `luly 21, 1959
3 Claims. (Cl. 29-65)
Multiple-spindle automatic lathes are provided with a
number of transversely movable tool-carriers arranged on
either side or both sides of a frame. Said frame carries
in its center a cylindrical revolving spindle carrier, herein~
after called “revolving head” wherein are journalled the
workpiece-carrying spindles (usually 4, 6 or 8 spindles)
the axes of which are spaced on a circle having its center
alignment with a single cooperating adjustable stop
mounted on the corresponding tool-carrier, and said stopcarrying member bearing transversely on the machine
frame in the direction of the feed motion of the tool«
carrier.
Thus, for each tool-carrier the series of stops on the
corresponding stop-carrying rotating member is adjusted
once and for all according to the position of the axis of
each spindle with respect to said tool-carrier. When it
is necessary to adjust the diameter of the workpiece after
a change of a tool, only the adjustable stop on the tool
carrier has to be readjusted.
In order that the invention may be clearly understood
and readily carried into practice, an embodiment thereof
will now be described more Ifully with reference to the
in the axis of the revolving head.
The revolving head is rotated stepwise about its axis
each time through an angle equal to the angular distance
accompanying drawings, in which:
between two successive spindles so that each spindle is pre 20
FIG. l is a front view showing the arrangement of the
sented in front of each tool-carrier.
spindles and tool-carriers in -a six-spindle automatic lathe
Such a multiple-spindle automatic lathe will be called
according to the invention;
hereafter “an automatic lathe of the type speciñed.”
FIG. 2 is a corresponding side view showing the revolv~
The arrangement to perform on each spindle succes~
ing head carrying frame and the rotating stop-carrying
sively the same operations to finally obtain identical pieces 25 members with their actuating mechanism; and
requires that each tool will stop in front of each successive
FIG. 3 is a partially sectioned fragmentary plan View
spindle at exactly the same distance from the axis thereof.
corresponding to FIG. 2, viewing along e axis of one of
In practice, whatever care has been exercised in the
the rotating stop-carrier.
construction of such a machine, differences are observed
In the illustrated device, a pinion 1 meshes with the
from one spindle to another, due in particular to inac 30 gear wheel v2 fixedly connected to the revolving spindle
curacy in the indexed angles of rotation of the revolving
carrying head 3.
head. Consequently, the end of the feed motion of each
The pinion 1 is mounted on a shaft 4 which carries at
tool~carrier must not be set with respect to the axis of the
its other end a bevel gear pinion 5 meshing with another
revolving head but with respect to the axis of each suc~
pinion 6 mounted on a transverse shaft 7 at each end of
cessive spindle in order to obtain identical pieces on all 35 which is also mounted a bevel gear pinion 8 meshing with
spindles.
a pinion 9 to drive a vertical shaft 10 journalled in the
In one of the known devices contrived for such a pur
frame at the corresponding side thereof.
pose, the end feed position is determined by the abutment
of the tool-carrier on a peripheral ring provided on the re
Each vertical shaft 10 cariies three suitably spaced
worms 11 each meshing with a worm gear 1.2 which is in
volving head. This results in applying substantial loads 40 fixed relation with a small stop-carrying member 13 ro
to the revolving head itself, which, after some time of
tatingly mounted in the frame and axially engaging said
use of the machine, may cause offsetting of the revolving
head, which will impair the precision of the machine.
In order to avoid such an inconvenience, it has been
proposed, in another known device, to provide the abut 45
ment, on the frame carrying said head rather than on
frame in the inward direction.
Each rotating member 13 carries six adjustable, circum
ferentially equally spaced stop-screws 14. Each adjustable
screw 14 corresponds to one of the spindles.
'
On eac-h tool-carrier 15 is mounted an adjustable stop
the revolving head. In such a device, each tool~carrier has
screw 16 so positioned as to be axially aligned with each
mounted thereon a number of adjustable stops, one for
stop-screw 14 when the latter is in its working position.
each spindle, and these stops are adapted successively to
If the revolving head 3 is rotated through 60° (angular
engage an intermediate part bearing on the frame and 50
space between two successive spindles), the gear 2 rotates
moving stepwise with the revolving head. Each stop of
the pinion 1 which, through the shaft 4, the bevel gears
the tool-carriers is then adjusted according to the position
S, 6, the shaft 7 and the bevel gears 8, 9, drives the
taken by the axis of the corresponding spindle when co
shaft 10 carrying the worms 11 which in turn actuate the
operating with the relevant tool-carrier. However, such a
device suffers from the drawback that, when the end posi 55 worm gears 12 of the stop-carrying members 13. By suit»
ably choosing the gear ratios, it is arranged that the stop
tion of the tool-carriers has to be changed (for reducing
carrying members rotate through the same angle as the
or increasing the diameter of the workpiece), every stop
revolving head 3, so that each stop-screw 14 correspond~
has to be newly adjusted.
ing to a respective spindle in each stop-carrying member
lt is the primary object of the present invention to
13 will come in turn in register with the stop-screw 16 of
avoid the inconvenience of having to adjust individually 60 the corresponding tool-carrier 15 when said respective
all the stops corresponding to each spindle when it is de
spindle will itself come in alignment with said correspond
sired to change the end position of the tool-carriers, while
ing tool-carrier.
however maintaining the advantage that the abutment is
Of course, without depar-ting from the scope of the
eifective against the frame and not against the revolving
present invention as delined in the appended claims, modi~
65
head.
iications may be made in the above described embodiment.
For this purpose, according to the present invention, an
Thus, the connecting drive between the revolving head 3
automatic lathe of the type specified comprises, for each
and the stop-carrying members 13 may be of any other
tool-carrier, a rotating member carrying circumferentially
suitable known type.
spaced axially adjustable stops, and mounted for rotation
What I claim is:
about an axis parallel to the direction of movement of 70
l. In a multiple-spindle automatic lathe having a frame,
the tool-carrier, the number of said stops being equal to
a revolving head rotatably mounted in said frame and
3,019,510
3
wherein are rotatably mounted, about axes parallel to the
axis of rotation of said revolving head and spaced on a
4
carrier, said stop~carrying member bearing transversely on
the machine frame in the direction of the feed motion of
the tool-carrier.
2. A multiple-spindle automatic lathe according to
mounted on said frame for transverse movement in a di U1 claim 1, wherein said means for rotating said stop-carry
ing members consists of a mechanical gear device.
rection at right angles with the axis of said revolving
y 3. A multiple-,spindle automatic lathe according to
head, the latter being adapted to be rotated stepwise so
claim 1, wherein said adjustable stops consist of adjustable
that each spindle in turn comes successively in Working
screws.
`
relationship with each tool-carrier, in combination, a ro
circle, a plurality of workpiece-carrying spindles, a plu
rality of tool-carriers in equal number to said spindles and
tating member, for each tool carrier, carrying circumfer
entially spaced, axially adjustable stops, and mounted for
References Cited in the ñle of this patent
rotation about an axis parallel to the direction of move
UNITED STATES PATENTS
ment of the tool-carrier, the number of said stops being
equal to the number of spindles on the revolving head,
means for rotating said stop-carrying member stepwise
2,325,571
Montgomery ___”, ____ __ July 27, 1943
2,399,045
Kylin ________________ __ Apr. 23, 1946
and synchronously with the revolving head so as to bring
each stop in turn in axial alignment with a single cooperat
ing adjustable stop mounted on the corresponding tool
FOREIGN PATENTS
545,776
Great Britain ________ ___„ June 1l, 1942
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