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Патент USA US3032152

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May l, 1962
H. AXER ETAL
3,032,142
AERANGEHENT EGE REGULATTNG THE HEIGHT 0E THE LUBRTCATTNG
FILM oN THE SLIDE TRACKS oF MACHINE TooLs
Filed Aug. 8, 1960
2 Sheets--Shee'rl 1
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Il
llIIII
WVM/70,95
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May 1, 1962
H. AXER ETAL.
3,032,142
AFRANGEMENT FOR REGULATING THE HEIGHT 0F THE LUBRICATING
FILM ON THE SLIDE TRACKS OF MACHINE TOOLS
Filed Aug. 8, 1960
2 Sheets-Sheet 2
United States
C@
3,032,142
Patented May 1, 1962
1
2
3,032,142
In machine tools which have a slide track provided
with depressions in which a lubricant under pressure
ARRANGEMENT FOR REGULATING THE HE‘fGHT
OF THE LUBRÍCATÍNG FILM 0N THE SLIDE
TRACKS OF MACHINE TOOLS
forms a pressure cushion, sensing means or feelers can be
arranged in the depressions along the length or circum
ference of the guide track. Each sensing means is coupled
Ratingen, near Dusseldorf, and Otto W. Ufert, Dussel
with a device for comparing the desired film height with
dorf-Oberkassel, Germany, assignors to Schiess Aktien
the actual film height. rl’he comparison device in turn
gesellschaft, Dusseldorf-Gberkassel, Germany
is coupled through an amplifier with a control motor
Filed Aug. 8, 1960, Ser. No. 43,313
which regulates control means for adjusting the amount
4 Claims. (Cl. 18d-_5)
10 of lubricant fed to the respective depressions in the slide
This invention relates to an arrangement for lubricat
track.
ing the slide tracks of machine tools, and more particu
The amount of lubricant supplied to the depressions
larly to an arrangement or system for regulating the height
in the slide track can be regulated by a throttle valve
of the lubricating film or lubricating gap between the face
which is controlled by the impulses derived from the
plate and the support bed of a vertical lathe.
sensing means provided in the depressions. According
Machine tools such as milling or planing lathes, com
to one embodiment of the invention a control motor,
prise heavy parts e.g, work piece holders, rotary tables,
the speed of which is responsive to the impulses derived
face plates etc., which move in special tracks or guide
from the sensing means drives one sun gear of a bevel
ways either in rotary or in reciprocating paths. These
gear drive, while a constant speed motor drives the other
heavy moving parts require proper lubrication at all 20 sun gear of the bevel gear. The rotation of the con
times, which must be satisfactory even as the amount
necting shaft of the planetary gears operates the throttle
of friction between the parts changes with the speed varia
valve which is provided in the supply line of the pres
tionsof the movable part or with the load which is ap`
surized lubricant between a pump and the depressions
'plied to it.
in the slide track.
Arrangements or systems in which a lubricant means 25
The connecting shaft of the planetary gears may be
Heinrich Axer, Neuss (Rhine), Wolfgang F. Hölken,
such as oil is fed under pressure between a slide track
connected through a spindle drive to the regulating means
and the body sliding thereon are already known. This
for the lubricant supply.
pressure is such that the weight of the face plate as well
The invention is disclosed by way of an embodiment
as that of the work piece carried thereby is supported
which is described hereafter and is shown in the accom
by the lubricant ñlm formed in this gap. The known 30 panying drawings which form a part hereof, in which:
arrangements and systems for regulating the height of
FIG. l is a schematic diagram of the lubricant control
the lubricating film do not provide a film which remains
arrangement of this invention with a partial section of
constant in height regardless of the weight and position
a circular slide track showing a depression in the support
of the load carried by the moving part and regardless
bed and the lubricant supply line thereto.
35
of the speed or motion of the latter.
FIG. 2 is a schematic diagram showing in elevation
It is therefore an object of `the present invention to
the lubricant supply arrangement of a circular face plate
provide an arrangement or system for lubricating the
with the lubricant control devices of FIG. l.
guide track of machine tools in which the height of the
The circular face plate 1 of a vertical lathe is mounted
lubricating film remains constant regardless of the weight
on a support bed 2. The track or guide surface 3 is
and position of the load placed on the moving part and
provided with a concentric lubricant supply canal which
regardless of the speed or motion of the latter.
p
is subdivided by web portions 4 into individual pressure
It is another object of the invention to provide an ar
chambers 5 (FIG, 2). The number of these pressure
rangement or system for lubricating machine tools in
chambers 5 may vary depending on the size of the face
which the regulation or control of the lubricating film is
plate such that it would increase for example with an
not influenced by particular characteristics of the machine
increase of the diameter of the face plate. The supply
' or the lubricant.
of lubricant to the chambers 5 is of sufficient pressure
It is a further object of the invention to provide an ar
to create a gap 6 the height a of which is to remain con
rangement or system for lubricating machine tools in
stant regardless of the weight of the load to be carried
which an equalization between the desired value or height
by the face plate or the speed of rotation of the face
50
of the lubricating film and its actual value is possible.
plate and regardless of whether the load is placed on one
Local variations in the height of the lubricating film
particular portion of the face plate or is distributed uni
can arise if the face plate is not mounted exactly parallel
formly.
to the support bed or if the face plate is inclined due to
The actual value or height of the lubricating gap 6 is
an eccentric load.
measured constantly by a sensing means or feeler 7 which
It is therefore still another object of this invention to
Vprovide a lubricating arrangement in which any disloca
tion or inclination of the face plate and corresponding
may be arranged appropriately in the center of each
change in the height of the lubricating film is picked up
locally and is immediately corrected upon arising by an
60
increase of the amount of lubricant supplied to that par
ticular spot.
The above objects of the invention are accomplished
by arranging spaced sensing means in the path of the
pressure chamber 5 and which may have either an in
ductive. or a capacitive or an hydraulic collecting or
controlling means. The measured value is transmitted
as impulse through a line 7’ to a device -which compares
the desired value or height of the lubricant to the actual
value, for example to a control compensator 8, which is
impressed with or adjusted to the desired value. From
this compensator any difference between the desired value
guide track which constantly sense the actual value of the 65 and the actual value is transmitted through a line 8' to
lubricant film height and by feeding the impulses thus
an amplifier 9. for example an electronic amplifier, and
derived to associated means which compare the desired
from this amplifier through a line 9’ to a control motor
value or height of the lubricating ñlm with the actual
10 (FIG. l).
value, from where any differences which may be derived
The lubricant is fed through a common supply pipe l2
are employed, after suitable amplification, to vary the 70 under a predetermined constant pressure by means of a
lubricant supply to the lubricant gap through control de
gear pump 11 to the pressure chambers 5 of the guide
vices which operate independently of each other.
track. The gear pump 11 is driven at a constant speed by
.3,032,142
3
d
an electric motor V11". The different control devices
which are employed with the same machine are connected
to pipe 12, which consists of a circular conduit in the case
of a rotary machine as shown in FIG. 2. The pressure of
-pump 11 is controlled by means of an overñow valve 13
Awhich is of conventional construction and is therefore not
»specifically described nor shown in detail in the drawing
scribed distance from the support bed in a vertical
-from where the lubricant discharged by the overñow
valve is returned to the lubricant supply vessel 11' of
tion and is not intended as a limitation.
pump 11.
In the embodiment shown a single pump is
used for the control devices, although each control Vde
direction.
Various modifications of the arrangement for regu
lating the height of the lubricating iilm on the slide tracks
of machine tools will suggest themselves to persons skilled
in the art, and it is understood that the embodiment de
scribed here represents only an illustration of the inven
>Thus for ex
ample the throttle valve 14 could be actuated by mag
netic means through the ampliñer 9. Furthermore the
invention which has been illustrated in conjunction with
the guide track of a vertical lathe can be applied, if neces
sary in a modified form, to machine tools having straight
vice could be provided with a separate pump. In the
case of a common supply pipe 12 and a single pump 11
guide tracks.
the individual control devices 23 are connected through
What we claimas new and desire to secure by Letters
branch condui-ts 12' with the individual pressure cham 15
Patent of the United States is:
bers 5 of the guide track and through branch conduits 12’
to the circular supply pipe 12.
l. An arrangement for regulating the height of the
Besides the overflow valve 13 a second flow control
means, for example a throttle valve 14, is provided in the
supply line between theY pump and the pressure chambers.
Throttle valve 14 which is of conventional construction
and is therefore not specially described nor shown in de
tail in the drawing has a slidable piston 15 which oper
ates to change the amount of lubricant supplied to the re
lubricating ñlm on the slide track of machine tools com
prising in combination a face plate and a support bed,
pressure chambers in said support bed along said slide
which is suitably constructed as a bevel-gear differential
track, purnp means for feeding pressurized lubricating
fluid to said pressure chambers and said slide track, valve
track, pump means for feeding pressurized lubricating
fluid to said pressure chambers an-d said slide track, valve
means for proportioning said lubricating fluid to said
pressure chambers, sensing means in said pressure cham
spective pressure chambers and thus regulates the height 25 bers for measuring the height of said lubricating fluid
on said slide track, reference means connected to said
vof the lubricant gap a. Piston 15 is actuated by means
sensing means for comparing the desired height of said
of a piston .rod divided into two sections the length of
lubricating iiuid on said slide track to the actual height
which may be altered through a helically threaded
of said lubricating fluid on said slide track, and means
spindle drive 24. Piston rod section 17 is connected to the
>valve piston and carries the fem-ale part 16 of the helically 3 O connected to said reference means for actuating rsaid
valve means in response to differences between the de
threaded spindle drive 24 while the other piston section
sired height and the actual height of said lubricating film.
17’ is provided with a complementary screw spindle 18
2. An arrangement for regulating the height of the
»which engages the female part 16 of piston rod section
lubricating lilm on the slide track of machine tools com
17. The end of piston rod section 17’ opposite the screw
spindle 18 is coupled with the connecting shaft 19 of the 35 prising in combination a face plate and a support bed,
pressure chambers in said support bed along said slide
gear pair 20, 20’ of a gear drive 2S. This gear drive 25
drive, com-prises a sun gear 21 driven at a constant speed
'
means for proportioning said lubricating iiuid to said preps
When control motor 10 rotates at the same number of
revolutions as the constant speed motor 22, the connect
sure chambers, sensing means in said pressure chambers
y25 to rotate in one or the other direction, depending on
whether the control motor 10 rotates faster or slower
said lubricating iiuid.
3. An arrangement for regulating the height of the lu
by control motor 10.
for measuring the height of said lubricating fluid on said
slide track, reference means connected to said sensing
ing shaft 19 of the gear drive 25 is at rest. If connecting
means for comparing the desired height of said lubricat
shaft 19 does not rotate, piston 15 in turn is not actuated,
ing iluid on said slide track to the actual height of said
and the valve open-ing of throttle valve 14 remains in the
lubricating fluid on said slide track, amplifying means
set position and allows a prescribed quantity of lubricant
connected to said reference means, a control motor con
to pass to gapl 6. However, if the armature voltage of
nected to said amplifying means, gear means connected
.control motor 10 is altered due to a variation in the height
to said control motor and said valve means, said control
a of the lub-ricant gap 6, the speed of the control motor 10
motor actuating said gear means in response to differences
varies with reference to that of the constant speed motor
:22. This difference in the rotating speed between motors 50 between the desired height and the actual height of said
lubricating iiuid to adjust said valve means and proportion
>10 and 22 causes the connecting shaft 19 of gear drive
bricating film on the slide track of machine tools com
Vthan the constant speed motor 22. The rotation of shaft
~19 in one direction or the other direction causes piston 55 prising in combination a face plate and a support bed,
pressure chambers in said support bed along said slide
rod section 17' to execute a corresponding rotation so
track, pump means for feeding pressurized lubricating
that the threaded end 18 either screws into or out of the
ñuid to said pressure chambers and said slide track, valve
female part 16 of the two-part piston rod 17, 17 ’ whereby
means for proportioning said lubricating fluid to said
the piston rod is respectively shortened or lengthened.
The opening of valve 14 is in turn respectively enlarged 60 pressure chambers, sensing means in said pressure cham
bers for measuring the height of said lubricating ñuid
or decreased and thus the amount of lubricant supplied
to the pressure chambers 5 is controlled in response to
on said slide track, reference means connected to said
sensing means for comparing the desired height of said
the impulses derived from the sensing means 7 in the
lubricating
liuid on said slide track to the actual height
pressure chambers.
In the embodiment described above each of the sector 65 of said lubricating liuid on said slide track, amplifying
means connected to said reference means, a control motor
shaped pressure chambers 5 is supplied with lubricant
connected to said amplifying means, a ñrst sun gear con
from a pump 11 through a common v'feed pipe 12. -Each
nected to said control motor, a bevel gear drive connected
pressure chamber 5 has associated therewith a control
to said sun gear, a constant speed motor, a second sun
device 23 as shown in FIG. 2. The construction and op
eration of the control devices 23 is conventional and does 70 gear connected to said bevel gear drive and said constant
speed motor, shaft means interconnecting two opposite
not form a part of this invention. These control devices
bevel gears of said bevel gear drive, a helically threaded
are therefore not further described in the specification
spindle drive connected to said valve means and said
.nor illustrated in detail in the drawing. This arrange
shaft means, said control motor driving said iirst sun gear
„ment has .the advantage that the face plate of a vertical
lathe maintains always its prescribedrheight or its pre 75 at a speed dissimilar to the speed of said second sun
3,032,142
5
6
gear in response to differences between the desired height
and the actual height of said lubricating ñuid to rotate
said opposite bevel gears and said shaft, said rotation of
said shaft operating said spindle drive to actuate said
valve means and apportion said lubricating ñuid.
4. An arrangement for regulating the height of the
threaded spindle drive connected to said valve means and
said shaft means, a two-part piston rod, an internally
lubricating film on the slide track of machine tools com
prising in combination a face plate and a support bed,
pressure chambers in said support bed along said slide
track, pump means for feeding pressurized lubricating
ñuid to said pressure chambers and said slide track, valve
means for proportioning said lubricating iiuid to said
pressure chambers, sensing means in said pressure cham
bers for measuring the height of said lubricating fluid
threaded portion at one end of one of said parts, an ex
ternally threaded portion at one end of the other of said
parts, said externally threaded portion engaging said in
ternally threaded portion, said two part piston rod con
necting said valve means and said shaft means, both said
motor means driving said first sun gear at a speed dis~
similar to the speed of said second sun gear in response
to differences between the desired height and the actual
height of said lubricating fluid to rotate said bevel gears
and said shaft means, said rotation of said shaft means
moving said externally threaded portion within said in
ternally threaded portion to vary the length of said two
on said slide track, reference means connected to said 15 part piston rod and actuate the valve means to proportion
sensing means for comparing the desired height of said
lubricating ñuid on sai-d slide track to the actual height
of said lubricating fluid on said slide track, amplifying
the lubricating ñuid.
References Cited in the ñle of this patent
UNITED STATES PATENTS
means connected to said reference means, a control motor
connected to said amplifying means, a iìrst sun gear con~
nected to said control motor, a bevel gear drive con
nected to said sun gear, a constant speed motor, a second
502,557
1,154,785
2,087,291
Doolittle _____________ __ Aug. 1, 1893
Lemp _______________ __ Sept. 28, 1915
Moross ______________ __ July 20, 1937
sun gear connected to said bevel gear drive and said
2,782,602
Hamilton _____________ __ Feb. 26, 1957
constant speed motor, shaft means interconnecting two
2,788,862
opposite bevel gears of said bevel gear drive, a helically 25 2,939,289
Langer _______________ __ Apr. 16, 1957
Clark ________________ __ June 7, 1960
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