Geometrical instruments – Gauge – Continuous gauging
Reexamination Certificate
1998-09-17
2001-09-18
Gutierrez, Diego (Department: 2859)
Geometrical instruments
Gauge
Continuous gauging
C033S501030, C019S239000, C019S0650CR, C019S023000, C019S240000
Reexamination Certificate
active
06289599
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application claims the priority of German Application No. 197 40 816.8 filed Sep. 17, 1997 and German Application No. 198 19 728.4 filed May 2, 1998, which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
This invention relates to an apparatus for measuring the thickness of a running sliver bundle in a drawing frame. A sliver guide is arranged at the inlet of the drawing unit of the drawing frame for the sliver bundle which is composed of side-by-side inputted slivers. The slivers are guided in a single plane through a measuring member which includes a biased, movable, mechanically contacting sensor element which, in cooperation with a counterface, forms a constriction through which the slivers pass after being densified thereby. The positional changes of the sensor element in response to thickness fluctuations of the running sliver bundle formed of the slivers are converted into electric control pulses by a transducer.
According to a known device which measures the thickness of a sliver bundle and which includes a sliver guide for guiding the sliver bundle at the drawing unit inlet, the walls of the device converge at least partially conically to gather the slivers inputted in one plane. Further, a roll pair is arranged downstream of the sliver guide. The slivers again diverge downstream of the roll pair. The sliver thickness measuring device has a biased, movable sensor element which forms a constriction with a stationary counterface for the throughgoing sliver bundle as outlined above. The sliver thickness is sensed as the densified slivers are guided in the sliver guide side-by-side, while the roll pair withdraws the sensed slivers.
It has further been proposed to densify the side-by-side arranged slivers from above across the width of the sliver bundle. For this purpose the sensor element, in addition to a sensing and densifying motion in the direction of the slivers, also executes a pivotal motion about an axis which is parallel to the running direction of the slivers and thus the sensor element is able to detect that, for example, slivers of unlike thickness are arranged side-by-side. The movable sensor element has a slide face by means of which the slivers are, in their side-by-side relationship, densified and pressed against the stationary counterface. Disadvantageously, in such an arrangement the thickest sliver determines the distance between the sensor element and the counterface, and even a small thickened location in one of the slivers results in a greater distance. The slivers on either side of such a thickened location are thus pulled out of the thus-obtained clearance without having been submitted to thickness sensing.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an improved apparatus of the above-outlined type from which the discussed disadvantages are eliminated and which, in particular, ensures a significantly improved detection of the thickness fluctuations of the slivers and makes possible a more accurate guidance thereof.
This object and others to become apparent as the specification progresses, are accomplished by the invention, according to which, briefly stated, the apparatus for measuring the thickness of a plurality of side-by-side running slivers includes a supporting surface guiding the side-by-side running slivers thereon in a single plane; a holding member; and a plurality of sensor elements movably secured to the holding member to be movable in a direction transverse to the plane. Each sliver is contacted by a separate sensor element for causing excursions thereof by thickness fluctuations of the running sliver. Each sensor element is yieldingly pressed against a respective sliver, and each sensor element cooperates with the supporting surface for pressing the running slivers against the supporting surface. A summation device adds the excursions of the sensor elements, and a transducer converts the excursion values into electric pulses.
By means of the invention according to which all slivers are individually measured for thickness at the inlet of the drawing frame, a differentiated summation result may be obtained in which the thickness of each individual sliver is taken into account. In this manner the evening of thickness fluctuations of all slivers is significantly improved, eventually resulting in a more uniform drawn sliver, and thus an improved yarn may be manufactured.
The invention includes the following additional advantageous features:
All sensor elements are connected with a holding member which is biased by a force-exerting member and to which the sum of the displacements of the individual sensor elements is applied.
The sensor element is biased by a spring or the like.
The sensor elements are constituted by leaf springs.
The leaf springs are cantilevered.
The counterface is the circumferential surface of a rotating roll.
The measuring member is arranged upstream of the sliver guide.
The measuring member is integrated in the sliver guide.
The sensor elements are connected with a rotatably or shiftably supported holding member which is biased by a force-exerting member and to which the sum of the displacements of the individual sensor elements is applied and wherein the end of the sensor elements includes a securing region fixedly connected with the holding member and further wherein the sensor elements form a moving means for the rotary of shifting motion of the biased holding member and the sensing region is formed by the other end of the sensor elements.
The sensor elements are leaf springs.
The sensor elements lie against the end face of a feed table.
A clearance is provided between the free ends of the sensor elements and the free end of the feed table.
The feed table or the feed roll are supported in a movable, spring-biased manner; the biasing springs are harder than the springs constituting the sensor elements.
The feed table is stationarily held relative to the direction of excursion of the sensor elements.
One end of the sensor elements may lift off the holding member.
An abutment is provided for limiting the excursion of the sensor elements.
The leaf springs are arranged parallel to one another.
The leaf springs are soft in the direction of the displacement of the feed table.
The leaf springs are stiff in the direction oriented from the feed table to the holding member.
The holding member is a longitudinal beam.
The holding member extends parallel to the feed roll.
The holding member is resistant to torsion forces.
At the end face of the holding member at least one torsion bar is disposed in an axial direction.
The holding member is supported in a rotary bearing at least at one end thereof.
A measuring element detects the rotary motion of the holding member.
The measuring element is an inductive path sensor.
The measuring element includes expansion strips.
In an apparatus in which the thickness variations are mechanically sensed over the width of the sliver bundle by the individual sensor elements, the thickness deviations are summarized by the common holding member by means of forming an average value.
The inputted fiber quantity for the drawing frame is altered as a function of the deviation of the actual value (average value) from a desired value.
The sensor elements are situated above the rotary roll forming a counter surface.
The leaf springs extend into the bight between two cooperating rolls between which the slivers pass.
The feed roll is stationarily supported.
The holding member is a hollow extruded member.
The extruded holding member is of aluminum or an aluminum alloy.
The holding member is provided at its end faces with a radially extending axle such as a bar or a pin.
REFERENCES:
patent: 4232447 (1980-11-01), Grunder et al.
patent: 4648054 (1987-03-01), Farah et al.
patent: 4881415 (1989-11-01), Hergeth
patent: 5123280 (1992-06-01), Baechler
patent: 5157810 (1992-10-01), Wicki
patent: 5237754 (1993-08-01), Oexler
patent: 5461757 (1995-10-01), Leifeld
patent: 5479679 (1996-01-01), Leifeld
patent: 5544390 (1996-08-01), Hart
Leifeld Ferdinand
Temburg Josef
Guadalupe Yaritza
Gutierrez Diego
Kelemen Gabor J.
Trutzschler GmbH & Co. KG
Venable
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