Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/36—Textiles
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/36—Textiles
  • G01N33/365—Filiform textiles, e.g. yarns

Definitions

• the invention relates to a device for the automatic determination of the fineness of textile test material in the form of yarns, rovings or tapes, with a device for withdrawing defined test material lengths from a supply, with a balance and with an evaluation unit.
• Fineness determinations are very important in textile practice, because fluctuations in fineness (also known as number fluctuations), that is, fluctuations in the length-related mass of a yarn, for example, lead to weft stripes in fabrics and stripes in knitwear.
• fineness determinations or number checks are carried out by spinning mills in the textile laboratories so that operating or setting errors can be recognized and corrected as quickly as possible.
• test material length of at least 100 meters, as a rule, required for a fineness determination is conveyed into the weighing pan by the take-off rollers and the gravity. It has been shown that even the smallest section of the test specimen hanging over the edge of the weighing pan or getting caught somewhere falsifies the measurement result in an intolerable manner. However, since this occurs relatively often, the measurement results are not reproducible and not reliable, so that these known devices have so far not been able to establish themselves.
• the invention is intended to provide a device for determining the fineness, the use of which enables automatic nucleation control.
• the measurement results should be precise and reliable, and the emptying of the weighing pan from the test material should work smoothly and without problems.
• the invention is based on the new finding that the reason why the known solution proposals have not been able to prevail so far is that the test material is conveyed into the weighing pan without any additional manipulation.
• a solution was found which leads away from the known, only apparently simple combination of uniformity tester and balance in a single device and consists in that the test material is formed into a ball-like package before being placed on the weighing pan. This guarantees that parts of the test material do not hang over the edge of the weighing pan or get caught anywhere, and furthermore the ball can be easily removed after the measurement, either by blowing or by a mechanical organ.
• the invention further relates to a use of the device mentioned in combination with a uniformity tester. This use is characterized in that the device is connected to the uniformity tester via a transport line and is connected to its evaluation unit.
• the uniformity tester and the device for determining the fineness are no longer combined in a common housing. It is precisely in this way that the further automation of the textile laboratory is decisively improved.
• 1 is a perspective view of a yarn testing system with a uniformity tester and a device for determining the fineness
• FIG. 6 shows a schematic illustration of a detail of the uniformity tester from FIG. 1;
• FIG. 7, 8 diagrams for functional explanation.
• the yarn testing system shown in FIG. 1 consists of a uniformity tester 1 for determining the fluctuations in mass of textile test material, such as yarns, rovings or strips of staple fibers, from an operating / Evaluation unit 2, from a fineness tester 3 and from a frame 4 for the presentation units with the test material P, for example yarn or roving bobbins.
• Yarn testing systems of this type are known with the exception of the precision tester 3 and are sold, for example, by the applicant of the present patent application under the name USTER TESTER (USTER - registered trademark of Zellweger Uster AG) worldwide.
• the uniformity tester 1 for the test material P consists of several modules, which are arranged in the running direction of the test material P, that is from top to bottom in the figure, as follows: First, a module 5 with a thread guiding device 6, for example a thread brake, then a module 7 with a measuring element 8, then a module 9 with a feed device 10 and then a module 11 with a suction nozzle 12. The lowermost module 11 is placed on a base 13, and all the modules 5, 7, 9 and 11 mentioned the base 13 are arranged in a frame 14 with a bow-like upper part 15 and held by this frame.
• the measuring element 8, through which the test material P is drawn through the feed device 10 formed by a pair of rollers, is a so-called capacitive measuring element.
• the operation / evaluation unit 2 contains, among other things, an analog / digital converter and a computer and, as shown, is combined with a screen.
• the electrical signals continuously generated by the measuring element 8 are processed by the computer of the evaluation unit 2 and stored in a suitable form in a memory integrated in the evaluation unit 2 and can be displayed on the screen before being printed out on the printer (not shown). This has the advantage that all the data that is obtained can initially be displayed on the screen and only selected data can be determined for printing on the printer.
• the signals generated by the measuring element 8 are representative of the cross-section of the test material and are processed in the operating / evaluation unit, for example, for the following parameters: spectrogram (wavelength spectrum of the mass fluctuations); Classification and counting of extreme stencils with the Perfection Indicator; Coefficient of variation and length variation curve. All of these parameters are known from the already mentioned USTER TESTER. - 1 -
• a hose or line 16 is connected to the suction nozzle 12. This leads to the fineness tester 3 and thus transports the test material P under the action of compressed air after the uniformity test for the fineness test. Since the fineness or the number of a yarn is specified as the mass per unit length (for example in grams per meter), the fineness determination is a determination of the mass of a defined test material length.
• the uniformity tester 1 processes and tests up to a few hundred meters of test material per minute, the length of test material P drawn and conveyed by the transport rollers 10 per unit of time being given by the speed of the transport rollers 10. On the other hand, if this speed is known, the conveyed length of the test material is determined by the time during which the test material is being conveyed.
• a cutting element only has to be controlled via a counter or timer in such a way that the test material is in each case according to a certain length, for example 100 meters is cut off (see Fig. 7a-7d).
• FIGS. 7a to 7d A switch with cutting elements (FIGS. 7a to 7d) is provided in module 11, through which the test pieces are either passed to the fineness tester 3 or to a waste container 26 (FIG. 6).
• the fineness tester 3 is shown in detail in FIGS. 2 to 5. 2 shows a front view and FIG. 3 shows a side view in the direction of arrow III of FIG. 2; FIG. 4 shows a partially cut-away top view of a detail from FIG. 2, and FIG. 5 shows a section along the line V - V from FIG. 4.
• the fineness tester 3 consists of a two-part housing with a lower and upper housing part 17 or 18, with an electronic scale 19 built into the lower housing part 17 and with a bell-shaped container 20 placed on the upper housing part 18, in which the line 16 (Fig. 1) opens.
• the container 20 is shown in detail in FIGS. 4 and 5.
• the two housing parts 17 and 18 are connected to one another via a pivot axis 21, about which the upper part 18 can be pivoted upwards relative to the lower part.
• a corresponding mofor and drive are arranged in the left half in FIG. 3 (in relation to FIG. 2, therefore, in the rear half) of the housing 17, 18.
• the container 20 consists of a bell-shaped cover 22 which is open at the top and a bottom 23 which is adjustable in relation to the cover 22 and for this stroke adjustment, in which the base 23 is lowered onto the scale 19, there is also a housing 17, 18 special drive mechanism (not shown) is provided.
• the mode of operation of the fineness tester 3 is as follows: as soon as the fineness of a test item is to be determined, it is blown through the line 16 into the container 20 in the predetermined length and thereby due to the effect of the blown air and the shape and dimensioning of the item holder 20 formed into a ball K. After the predetermined length of the test material has been conveyed into the container 20, it lies in the form of the ball K on the floor 23.
• the scale 19 measures the weight of the floor 23 and ball, subtracts the known weight from the floor 23 and displays the net weight of the ball in a display field 24.
• the weight is of course also supplied to the operating / evaluation unit 2 for determining the precision and any other parameters derived therefrom.
• the cover 22 of the housing 20 has a bell-like shape and consists of two frustoconical parts with different angles of inclination.
• the wall of the lower part with the height Hl has an inclination of 70 ° to 90 °, preferably about 85 °
• the wall of the upper part with the height H2 has an inclination of 45 ° to 75 °, preferably about 60 °.
• the height Hl is about twice as large as H2. At the top is the lid
• the lower, open end is closed by the bottom 23 when a ball K is formed.
• the line 16 opens into the cover 22 in a tangential plane at an acute angle of less than 45 °, preferably of about 20 ° to the horizontal, the mouth lying somewhat below the transition area between the lower and upper part of the cover 22.
• the test material P is blown by the air in line 16 against the inner wall of the lower cover part and slides along it in the direction of arrow A (FIG. 4) and spirally downwards. As soon as the test material P is on the floor
• FIG. 6 schematically shows the pair of rollers of the feed device 10 and the suction nozzle 12 (FIG. 1), which is designed as a switch for the optional forwarding of the test material P to the fineness tester 3 or to a waste container 26.
• FIGS. 7a to 7d show the suction nozzle 12 in various operating states and
• FIG. 8 shows diagrams for the explanation of the function.
• the suction nozzle 12 consists of two nozzles D1 and D2 connected to a common one piece E, which branch off in a fork shape from the one piece and can be individually pressurized with compressed air. These nozzles are preferably so-called Coanda nozzles of the type described in FR-A-2 606883.
• each nozzle D1, D2 and the one-piece E there is a controllable knife M1 or M2.
• a line leading to the waste container 26 is connected to the nozzle D1, and the line 16 to the fineness tester 3 is connected to the nozzle D2.
• the control of the nozzles D1, D2 and the knives M1, M2 is carried out by a suitable control stage ST using a tachometer signal which is removed by a sensor 27 which is positively connected to one of the rollers 10.
• the line tachometer signal is shown in FIG. 8, line b, and consists of rectangular pulses, the number of which represents a measure of the length of the test material P drawn off by the pair of rollers 10. Accordingly, both the time t and the subtracted test length L are plotted on the abscissa in FIG. 8.
• the test material is conveyed into the waste container 26 by the time t1, where this is certainly the case.
• the nozzle D1 is in operation, the nozzle 2 is not in operation, the knife M1 is open and the knife M2 is closed.
• the knife M1 cuts (FIG. 7b), the nozzle D2 is activated and the knife M2 is opened.
• the nozzle Dl is only switched on shortly after tl, so that the cut test material safely arrives in the waste container 26.
• the knife M 1 then remains closed and the knife M2 is open, the nozzle D1 is not in operation and the nozzle D2 conveys the test material P to the fineness tester 3. This corresponds to FIG. 7c and the state 7c in line g of FIG. 8 .
• time t2 (state according to FIG. 7d) there is now a cut through the knife M2.
• the processes take place in the opposite way to the time t1 and the cut test material reaches the fineness tester 3 completely, the nozzle 02 only being switched off shortly after t2.
• the state according to FIG. 7 a is then reached again and the test material P is conveyed into the waste container 26 until the next fineness determination.
• the duration of the time span between t1 and t2 is defined by a number N of pulses of the tachometer signal (FIG. 8, line b) corresponding to a predetermined test material length delta L of preferably 100 m. Since the time span between the cuts of the knives Ml and M2 can be precisely determined by the speedometer signal at a constant test material speed, the exact length of the test material is obtained for the fineness determination and a standard length can be easily selected.

Landscapes

• Engineering & Computer Science (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Textile Engineering (AREA)
• Medicinal Chemistry (AREA)
• Food Science & Technology (AREA)
• Physics & Mathematics (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• General Physics & Mathematics (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Treatment Of Fiber Materials (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4266070

Family Applications (1)

Country Status (10)

Cited By (2)

Families Citing this family (8)

Citations (5)

Family Cites Families (13)

• 1987
  • 1987-10-06 CH CH3907/87A patent/CH675305A5/de not_active IP Right Cessation
• 1988
  • 1988-09-06 IN IN622/MAS/88A patent/IN171167B/en unknown
  • 1988-09-28 US US07/364,431 patent/US5025660A/en not_active Expired - Fee Related
  • 1988-09-28 KR KR1019890700581A patent/KR970007076B1/ko not_active IP Right Cessation
  • 1988-09-28 JP JP63507535A patent/JP2676396B2/ja not_active Expired - Lifetime
  • 1988-09-28 WO PCT/CH1988/000175 patent/WO1989003531A1/de active IP Right Grant
  • 1988-09-28 EP EP88908127A patent/EP0348443B1/de not_active Expired - Lifetime
  • 1988-09-28 AT AT88908127T patent/ATE78595T1/de active
  • 1988-09-28 DE DE8888908127T patent/DE3873079D1/de not_active Expired - Fee Related
  • 1988-10-06 CN CN88109097A patent/CN1018075B/zh not_active Expired

Patent Citations (5)

Also Published As

Similar Documents

Legal Events