|Title of Invention||
AN IMPROVED FIBRE PROCESSING MACHINE
|Abstract||A fiber processing machine includes a rotary roll provided with a peripheral clothing; a counter element having a part cooperating with the roll clothing; a sensor stationary relative to the counter element and having a sensing portion facing said roll clothing; and an arrangement for generating a signal representing a distance between the sensing portion and the roll clothing. The distance represents a spacing between the roll clothing and the counter element part.|
|Full Text||BACKGROUND OF THE INVENTION
This Invention relates to a device provided in a fiber processing
(spinning preparation) machine, for example, a carding machine, a
cleaner or the like for measuring distances between facing surfaces.
The machine has a clothed roll which cooperates with a counter
element, for example, a closure member and/or a clothed carding
element. At least one stationary sensor is provided, and with the
counter element a setting arrangement is associated for varying the
radial distance between the roll clothing and the counter element.
The distance between the carding cylinder clothing and a facing
component is of substantial significance as concerns the carding
machine and properties of the fiber. The result of the carding process
such as fiber cleaning, nep formation and fiber shortening is largely
dependent from the carding gap, that is, the distance between the
cylinder clothing and the clothing of the traveling flats or stationary
carding elements. The channeling of air about the carding cylinder
and heat removal are also dependent from the distance between the
cylinder clothing and the clothed or unclothed surfaces, such as mote
knife or housing shells. Such clearances are affected by various,
partially counteracting factors. A wear of facing clothings leads to an
enlargement of the carding gap which, in turn, results in an increase
of the nep number and a decrease of the fiber shortening. An
increase of the cylinder rpm, for example, for enhancing the cleaning
effect, results in an enlargement of the cylinder including its clothing
because of the centrifugal forces and thus diminishes the carding
gap. Further, when large quantities of fiber or particular types of fiber,
for example, chemical fibers are processed, then because of the
temperature increase the carding cylinder expands to a greater extent
than other, neighboring machine components, resulting in a decrease
of the distances of the cylinder clothing from adjoining components.
The carding clearance is affected particularly by the machine
settings, on the one hand, and the condition of the clothing, on the
other hand. The most important carding clearance of a card equipped
with traveling flats is in the principal carding zone, that is, between
the carding cylinder and the traveling flats assembly. Of the two
clothings which define the carding clearance at least one is in motion
(in most cases both are moving). To increase the output of the card, it
has been desirable to select the operating rpm, that is, the operating
speed of the movable elements, to be as high as permitted by the
fiber processing technology. The working clearance is measured in
the radial direction (starting from the rotary axis) of the carding
In current carding processes increasingly larger fiber quantities per
unit time are being handled, requiring higher speeds of the working
components. Alone an increase of the fiber flow rate leads, because
of the mechanical work, to an increased heat generation even if the
working surface areas remain constant. At the same time, however,
the technological carding results (uniformity of sliver, degree of
cleaning, reduction of neps, etc.), are increasingly improved which
requires larger working surfaces participating in the carding process
and a closer setting of the components to the carding cylinder. The
share of chemical fibers to be processed continuously increases. As
compared to cotton, chemical fibers generate more heat due to their
frictional contact with the working components of the fiber processing
machine. In contemporary designs the working components of high-
performance carding machines are enclosed from all sides in order to
comply with the stringent safety requirements, to prevent particle
emission into the spinning room and to minimize the maintenance
requirements of the machines. Grates or even open, material-guiding
surfaces which provide for an air exchange, belong to the past.
In view of the above-listed circumstances, the heat input into the fiber
processing machine is significantly increased while the extent of heat
removal by means of convection has been substantially reduced. The
resulting significant heat-up of the high-performance carding
machines leads to increased thermo-elastic deformations which,
because of the non-uniform distribution of the temperature field, affect
the set distances of the working components: the distances decrease
between the carding cylinder and the traveling flat bars, the doffer,
the stationary flat bars as well as the discharge locations. In an
extreme case the set gap between the working components may
completely disappear because of heat-caused expansions, so that
relatively moving working components collide with one another. This
results in significant damaging of the high-performance carding
machine. Particularly the generation of heat in the working zone of
the carding machine may lead to unlike thermal expansions between
the structural components in case of excessive temperature
In practice the quality of the clothing of the flat bar clothings is in
regular intervals visually verified by an attendant; a wear results in an
increase of the carding gap. In a known device, as disclosed in
European patent document 801 158, a sensor is provided with which
the working distance of carding clothings, that is, the carding gap may
be measured. What is thus measured is the effective distance of the
clothing points of one clothing between that of the facing clothing of
the machine element. The machine element may have a clothing or
may be formed by a housing shell segment having a guide surface.
The sensor is conceived particularly for measuring the working
distance between the carding cylinder and the flat bars of a traveling
flats assembly where an optical device, positioned laterally, senses
the carding clearance between the carding cylinder and the flat bar
clothings. It is a disadvantage of such an arrangement that the
measuring results cannot lead to a conclusion concerning a
clearance change in the width direction (that is, parallel to the axis of
the carding cylinder). Further, a distance between the sensor and the
counter element cannot be measured with such a device.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an improved device of the
above-outlined type from which the discussed disadvantages are
eliminated and which particularly makes possible to sense distance
changes in the width direction and further, which senses in a simple
manner only the distance from the carding cylinder clothing and
makes possible an optimal setting of such distance.
This object and others to become apparent as the specification
progresses, are accomplished by the invention, according to whicn.
briefly stated, a fiber processing machine includes a rotary roll
provided with a peripheral clothing; a counter element having a part
cooperating with the roll clothing; a sensor stationary relative to the
counter element and having a sensing portion facing said roll
clothing; and an arrangement for generating a signal representing a
distance between the sensing portion and the roll clothing. The
distance represents a spacing between the roll clothing and the
counter element part.
By the measures according to the invention a wear of the cylinder
clothing may be determined, particularly after a longer service period.
A distance adjustment results in a change of the effect of the cylinder
clothing, either directly with regard to the wear and or indirectly as
concerns the clothed or unclothed counter element, particularly the
wear of the clothing of a stationary carding element and the heat-
caused expansions of the counter element. In this manner, based on
a desired value, an optimal setting of the distance between the
carding cylinder and the counter element is possible. Distance
detection and adjustment may be performed during operation.
The invention has the following additional advantageous features:
The sensor detects the distance between itself and the points of the
The sensor detects the distance between the counter surface and the
points of the cylinder clothing.
The signals of the sensor are applied as input magnitudes to a control
and regulating apparatus for the distance regulation between the
counter element and the cylinder clothing.
The radial distance between the cylinder clothing and the counter
element may be settable by the position and/or form of the flexible
supporting layer which is arranged between the end portions of the
counter element and a stationary substrate face of the machine.
The counter element is a housing element of the cylinder.
The cylinder cover is an extruded profiled aluminum component.
The surface of the counter element oriented towards the carding
cylinder has a carding clothing.
The sensor detects the wear of the cylinder clothing.
The sensor detects a displacement of the counter element caused by
The sensor detects a displacement of the cylinder clothing caused by
thermal expansion and/or centrifugal forces.
The sensor and setting means are connected to an electronic control
and regulating apparatus.
The electronic control and regulating apparatus has a memory for the
desired values of the working gaps, and upon exceeding the desired
value, a switching operation or display is initiated.
The setting device for adjusting the working gap is actuated by
manual input, for example, by means of a push button.
At least one parameter relating to the change of the working gap,
such as temperature, is measured for producing a measuring value
relating to the working gap.
The position of the flat bar assembly is adjusted as a function of the
measuring value for preserving the working gap in accordance with a
BRIEF DESCRIPTION OF THE DRAWINGS :
FIG. 1 is schematic side elevational view of a carding machine
incorporating the invention.
FIG. 2 is a fragmentary sectional schematic front elevational view of
the device according to the invention, facing the clothing of the
FIG. 3 is a fragmentary sectional side elevational view of a stationary
carding element incorporating the invention.
FIG. 4 is a block diagram of a control circuit associated with a
distance detecting sensor according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a carding machine CM which may be, for example, an
EXACTACARD DK803 model manufactured by Trutzschler GmbH &
Co. KG, Monchengladbach, Germany. The carding machine CM
includes a feed roll 1, a feed table 2 cooperating therewith, licker-ins
3a, 3b, 3c, a carding cylinder 4 having a cylinder clothing 4a, a
direction of rotation 4b and a rotary axis M, a doffer 5, a stripping roll
6, crushing rolls 7 and 8, a web guiding element 9, a sliver trumpet
10, calender rolls 11, 12, a traveling flats assembly 13 having
traveling flat bars 14, a coiler can 15, a coiling device 16 and the
device according to the invention including a sensor 19. The rotary
directions of the various roll components of the carding machine are
shown by curved arrows drawn therein. A stationary carding segment
27' is positioned between the licker-in 3c and the rearward end
sprocket 13a of the traveling flats assembly 13 whereas the
stationary carding segment 27" is situated between the doffer 5 and
the frontal end sprocket 13b of the traveling flats assembly 13.
Turning to FIG. 2, three sensors 19a, 19b and 19c are arranged
which are spaced from one another parallel to the axial length of the
carding cylinder 4. The respective sensor surfaces 19', 19" and 19'"
are oriented towards the clothing 4a of the carding cylinder 4 and are
spaced at a distance a therefrom. Fine-threaded adjustment nuts
21a, 21b and 21c provide for a setting of the distance a for each
sensor relative to the cylinder clothing 4a. The sensors 19a, 19b and
19c are secured in a holding device 22 which is secured stationarily
to the lateral shield plates 24a, 24b by means of respective screws
23a and 23b.
Turning to FIG. 3, a generally semicircular rigid lateral shield plate 24
is secured to the machine frame (not shown) on each side of the
carding machine. An arcuate rigid support element 25 is
concentrically affixed by casting to the periphery of each shield plate.
The support element 25 has an underside and a convex outer face
serving as a supporting surface. On the support element 25 a
circumferentially wedge-shaped flexible supporting strip 26 is
positioned which is made, for example, of a low-friction synthetic
material and which has a convex outer surface and a concave inner
surface. The concave inner surface lies on the convex surface of the
support element 25 in an annular groove thereof and may slide
therein in the direction of the arrows A, B. The shifting of the support
strip 26 circumferentially in the direction A or B, is, as symbolically
illustrated in FIG. 4, effected by a shifting or setting device 35 which
includes a driving device such as a motor, a gearing or the like. At
opposite axial ends the carding segment 27' is supported on the
convex outer face of the support strip 26, so that as the support strip
26 is circumferentially shifted, it displaces radially the carding
segment 27' by a camming effect. On the underside of the carding
segment 27' carding elements 27a are provided, each having a
carding clothing 27b. The circle on which the points of the clothings
27b lie is designated at 28. The circle circumscribable about the
points of the clothing 4a of the carding cylinder 4 is designated at 29.
The distance between the circles 28 and 29 is designated at b and is,
for example, 0.20 mm. The distance between the convex outer face
26a and the circle 29 is designated at c. The radius of the convex
inner face 26a is designated at r1 and the radius of the circle 29 designated at
r2. The radii r1 and t2 intersect on the cylinder axis M.
The carding segment 27' includes a carrier 30 which holds the two carding
elements 24a in seriesin the rotary direction 4b of the carding cylinder 4. The
clothings 24b of the carding elements 24a face the clothing 4a of the carding
cylinder 4. A holding element 31 carrying the sensor 19 is secured to a vertical
end face of the carrier 30.
Also referring to FIG. 4, in case the distance a between the measuring surface
19' of the sensor 19 and the points 29 of the cylinder clothing 4a decreases, for
example, because of thermal expansions, or increases because of a wear of the
cylinder clothing 4a, the sensor emits a signal which is applied by an electric
conductor 32 to an electronic evaluating device 33. The electric signal may be
utilized for setting or adjusting a given distance b (desired value) by means of an
electronic control and regulating apparatus 34. For this purpose, the
circumferentially wedge-shaped supporting strip 26 is displaced on the
circumferential groove of the support member 25 in the direction A or B. As a
result of such a shift the carding segment 27' is displaced in the direction of the
arrow C or D. The distance b between the clothings 24b of the carding elements
24a and the cylinder clothing 4a is thus accurately adjustable in a simple
The evaluating device 33 which displays and stores the magnitudes detected by
the sensor 19, is connected with the electronic card control device 34 which
emits signals for the setting devince 35 for shifting the support strip 26 to thus
adjust the carding gap (that is, the distance b) between the clothing 24b of the
carding segment 27' and the clothing 4a of the carding cylinder 4. At the same
time, this information is also applied to a carding information system which may
be a KIT model, manufactured by Trutzschler GmbH & Co. KG and which forms
part of a computer display device 36 where the data of an entire carding group
The invention was described, as an example, in conjunction with the
clothings 24b of the carding segment 27', cooperating with the
clothing 4a of the carding cylinder 4. It is to be understood that the
invention also encompasses a non-clothed counter element, for
example, a circumferential shell plate shrouding the carding cylinder.
In case the sensor 19 according to FIG. 3 is secured to the counter
element and the distance b from the counter element decreases (for
example, because of a thermal expansion), then according to the
measures of the invention, by means of measuring the distance a, the
distance b is determined.
Structural features relating to mechanisms for adjusting the working
distances by means of shifting the support strip 26 as a function of
sensor signals are disclosed, for example, in U.S. Pat. No. 5,918,349
which is incorporated herewith by reference.
It will be understood that the above description of the present
invention is susceptible to various modifications, changes and
adaptations, and the same are intended to be comprehended
within the meaning and range of equivalents of the appended claims.
1. An improved fiber processing machine comprising
(a) a rotary roll(4) provided with a peripheral clothing (4a);
(b) a counter element (27a) held stationarily during operation and having
a part (27b)cooperating with the roll clothing (4a);
(c) a sensor (19) affixed to said counter element (27a) and having a
sensing portion (19') facing said roll clothing (4a);
(d) means(19a, 19b, 19c) for generating a signal representing a distance
between said sensing portion (19') and said roll clothing (4a); said
distance representing a spacing (b) between said roll clothing(4a) and
said part (27b) of said counter element (27a);
(e) a control and regulating device (33, 34) connected to said sensor(19)
for receiving said signals therefrom; and
(f) setting means (35) having a component engaging the stationarily held
counter element (27a) for displacing said counter element radially with
respect to said rotary roll (4) to alter said spacing (b) between said roll
clothing (4a) and said part (27b) of said counter element (27a) as a
function of said signal.
2. The fiber processing machine as claim 1 wherein said roll
clothing (4a) has points (29) and wherein said signal represents
a distance (c) between said sensing portion (19) and said points
(29) of said roll clothing (4b).
3. The fiber processing machine as defined in claim 1, wherein
said counter element (27a) is a housing portion covering said
rotary roll (4).
4. The fiber processing machine as claimed in claim 1, wherein
said counter element (27a) has a clothing (27b) lacing said roll
5. The fiber processing machine as claimed in claim 1, wherein
said fiber processing machine is a carding machine (CM) and
said rotary roll (4) is a main carding cylinder of said carding
6. The fiber processing machine as claimed in claim 1, wherein
said control and regulating device (33) has a memory for
storing data representing desired values of said spacing (b).
7. The fiber processing machine as claimed in claim 1, wherein said
component (26) is an elongated, wedge-shaped member shiftable
circumferentially relative to said rotary roll (4); said counter element (27a)
being in engagement with and being radially displaceable by, said wedge-
shaped member (26) by camming effect between said counter element
(27a) and said wedge-shaped member(26) during circumferential shifting
motions of said wedge-shaped member (26).
A fiber processing machine includes a rotary roll provided with a
peripheral clothing; a counter element having a part cooperating with
the roll clothing; a sensor stationary relative to the counter element
and having a sensing portion facing said roll clothing; and an
arrangement for generating a signal representing a distance between
the sensing portion and the roll clothing. The distance represents a
spacing between the roll clothing and the counter element part.
|Indian Patent Application Number||269/CAL/2000|
|PG Journal Number||30/2011|
|Date of Filing||05-May-2000|
|Name of Patentee||TRUTZSCHLER GMBH & CO. KG.|
|Applicant Address||DUVENSTRASSE 82-92, D-41199 MONCHENGLADBACH|
|PCT International Classification Number||D01G 15/76|
|PCT International Application Number||N/A|
|PCT International Filing date|