US20190153629A1 - Drafting Device of a Textile Machine - Google Patents

Drafting Device of a Textile Machine Download PDF

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Publication number
US20190153629A1
US20190153629A1 US16/098,351 US201716098351A US2019153629A1 US 20190153629 A1 US20190153629 A1 US 20190153629A1 US 201716098351 A US201716098351 A US 201716098351A US 2019153629 A1 US2019153629 A1 US 2019153629A1
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United States
Prior art keywords
roller
rotation
counter
support
axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US16/098,351
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English (en)
Inventor
Christian Griesshammer
Fabian Lehner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter AG
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Filing date
Publication date
Application filed by Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
Publication of US20190153629A1 publication Critical patent/US20190153629A1/en
Assigned to MASCHINENFABRIK RIETER AG reassignment MASCHINENFABRIK RIETER AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEHNER, FABIAN, GRIESSHAMMER, CHRISTIAN
Abandoned legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/70—Constructional features of drafting elements
    • D01H5/74—Rollers or roller bearings
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/56—Supports for drafting elements

Definitions

  • the present invention relates to a drafting device of a textile machine that includes at least one roller and at least one corresponding counter roller, between which a fiber structure can be guided and clamped.
  • the roller and the counter roller each have a roller body and an axis of rotation.
  • the axis of rotation of the roller and that of the counter roller are supported on only one end, the roller being mounted movably between a resting position, in which the roller bodies of the roller and the counter roller do not come in contact, and a load position, in which the roller bodies of the roller and the counter roller are pressed against one another.
  • the roller is movable into an intermediate position in transition from the resting position to the load position. In the intermediate position, the roller bodies of the roller and the counter roller only come in contact.
  • Drafting devices are known in the prior art and are used with ring spinning machines or air spinning machines, for example, where they are used for drafting (other conventional terms for this are “drawing” or “stretching”) and thus for making the fiber structure supplied to the spinning machine more uniform.
  • Drafting devices are used in so-called spinning mill preparation machines, in particular for stretching, which are connected upstream from the corresponding spinning machines and also serve to make the fiber structure more uniform.
  • the aforementioned drafting devices comprise two or more roller configurations, each having corresponding rollers and counter rollers in turn, which are ultimately driven at increasing rotational speeds to cause the fiber structure to be drawn in the direction of transport of the fiber structure passing through the drafting device.
  • rollers and counter rollers can be mounted on both sides by means of two laterally protruding axes of rotation
  • the axis of rotation usually is colinear with the axis of rotation of the roller body of the corresponding roller and/or counter roller and can be supported by means of a ball bearing or roller bearing in a support of the drafting device.
  • the clamping force acting on the fiber structure due to the pressure of the roller and the counter roller in the load position is not constant in the direction of the axes of rotation of the roller and the counter roller but instead decreases with an increase in the distance from the bearings—resulting in a negative effect on the drawing results.
  • An object of the present invention is to counteract this disadvantage and to propose a drafting device with which the fiber structure to be drawn is subjected to a uniform treatment over its width (i.e., at a right angle to the direction of transport) with a clamping force generated by the roller and the counter roller.
  • the drafting device is characterized in that the axes of rotation of the roller and the counter roller are directed toward one another in the intermediate position (in which the roller bodies of the roller and the counter roller do not come in contact), such that the roller bodies of the roller and the counter roller have a joint contact region that is smaller in the axial direction of the axis of rotation of the roller than in the load position, in which the roller bodies of the roller and the counter roller are pressed against one another (the position mentioned last is assumed by the roller during the drafting operation while a fiber structure is being transported through the drafting device and thereby drawn).
  • the actual value of the pressing force during the drafting operation should be adjustable through appropriate load elements, wherein the load elements are designed as pneumatic cylinders, for example, with the help of which a load force can be transferred to the bearing of the roller or counter roller to press the roller and the counter roller against one another.
  • roller and “counter roller” which are used here say nothing about the mutual spatial orientation. It is thus possible for the roller to be arranged at a right angle above the counter roller, so that the direction of transport of the drafting device is horizontal. Likewise, the direction of transport of the drafting device may run at a right angle or obliquely to the horizontal and to the vertical so that the roller and the counter roller may be arranged side by side or offset obliquely to one another.
  • the drafting device according to the invention should of course comprise a plurality of roller configurations, each having at least one roller and at least one counter roller.
  • a plurality of counter rollers may be associated with one roller of the drafting device and vice versa, and it is also conceivable for a belt to be wrapped around one or more rollers and/or counter rollers to be able to guide the fiber structure in a particularly reliable manner.
  • At least one roller and/or counter roller of a roller arrangement can be moved between the aforementioned resting position and the aforementioned intermediate position.
  • the contact region has a contact surface which is smaller than that in the load position by a factor of at least 10, preferably a factor of at least 20, especially preferably a factor of at least 50.
  • the roller and the counter roller are preferably in contact with one another in the load position (without a fiber structure in between), such that they form a joint clamping line, preferably 2 cm to 8 cm long.
  • the contact surface here is essentially linear, wherein the line may have a width of a few tenths of a millimeter up to several millimeters.
  • the line preferably has a width of 0.2 mm to 3.0 mm, especially preferably 1.0 mm to 2.5 mm.
  • the contact surface in the intermediate position is embodied in the form of dots.
  • the contact surface is at least significantly smaller than that in the load position, so that the aforementioned advantages with regard to the uniform clamping force acting on the fiber structure during drafting operation can be implemented.
  • the roller bodies of the roller and the counter roller come in contact only in the area of their respective end faces.
  • the axes of rotation of the roller bodies of the roller and the counter roller do not run parallel to one another in the intermediate position.
  • the axes of rotation instead are arranged obliquely to one another, but they may also lie in the same plane.
  • the imaginary extensions of the axes of rotation of the roller bodies would intersect.
  • both the axis of rotation of the roller and the axis of rotation of the counter roller are mounted rotatably at one end by means of a bearing of the drafting device, wherein the roller bodies of the roller and the counter roller in the intermediate position come in contact only in the region of their end faces, which face away from the bearings. If the roller is then moved from the intermediate position into its load position, the contact region, which is at first essentially in the form of dots, develops into an essentially linear contact region, so that the roller and the counter roller ultimately form a joint clamping line with the mutual pressing force of the roller bodies being as constant as possible over the length thereof.
  • the axes of rotation of the roller and the counter roller lie in a common plane, at least in the load position.
  • the axes of rotation in the aforementioned position also preferably run parallel to one another (in at least some sections) to form the aforementioned clamping line (wherein, alternatively, a skewed orientation of the aforementioned axes of rotation would also be conceivable). It is equally conceivable for the respective axes of rotation to also lie in a common plane in the intermediate position and/or in the aforementioned resting position.
  • the angle between the individual roller configurations may vary, so that the amount may depend on the respective diameters of the axes of rotation and/or the roller bodies, for example, and/or the configuration within the drafting device (a drafting device usually has a pair of input rollers, one or more central roller pairs and one output roller pair, wherein fiber structure passes over the individual roller pairs one after the other, as seen in the transport direction).
  • the axis of rotation of the roller and the axis of rotation of the counter roller run obliquely to one another in the intermediate position.
  • the roller in this case is not moved back and forth between the load position and the resting position in a direction linear and perpendicular to the respective axes of rotation. Instead, the movement takes place in a pivoting movement, so that, in the intermediate position, the imaginary extensions of the aforementioned axes of rotation do not intersect.
  • the drafting device has a support that is pivotable about a pivot axis and comprises a bearing of the roller, wherein the pivot axis of the support and the axis of rotation of the roller run obliquely to one another at least in the intermediate position.
  • the support may accommodate one or more rollers by means of corresponding bearings and can preferably be secured in the load position of the rollers with the help of retaining elements that operate pneumatically, mechanically and/or electromechanically.
  • there may be counter support which serves to accommodate and/or support the counter roller, the counter support preferably being secured rigidly in the corresponding textile machine and/or its drafting device.
  • the counter support may accommodate one or more counter rollers by means of corresponding bearings.
  • pivot axis of the support and the axis of rotation of the counter roller to run obliquely relative to one another, at least in the intermediate position. If the support is pivoted in such a way that the rollers are in their load positions, then the axes of rotation of the roller and the counter roller of at least one roller configuration should lie in a common plane.
  • the drafting device has a support that is pivotable about a pivot axis and comprises the bearing of the roller, wherein the pivot axis of the support and the axis of rotation of the roller run parallel to one another at least in the intermediate position, and wherein the axis of rotation of the roller and the pivot axis of the support run skewed to one another at least in the intermediate position.
  • the smaller contact area between the roller and the counter roller is achieved in the intermediate position by the fact that the axis of rotation of the roller in a frontal view of the drafting device (as seen in the direction opposite the direction of transport) is mounted obliquely in the support.
  • the support is pivotable about a pivot axis preferably running horizontally.
  • the drafting device has a support that is pivotable about a pivot axis and comprises the bearing of the roller, wherein the pivot axis of the support and the axis of rotation of the roller run parallel to one another at least in the intermediate position, and wherein the axis of rotation of the counter roller and the pivot axis of the support run skewed to one another, at least in the intermediate position.
  • both the axis of rotation of the roller and the pivot axis run obliquely to the horizontal in the aforementioned frontal view, so that it is ensured that again in this case, the roller will be in contact with the counter roller in only a small contact area in the intermediate position.
  • the bearing of the axis of rotation in the support and/or counter support may be rotatable or rotationally fixed.
  • the roller In the case of a rotationally fixed support of the axes of rotation in the support, the roller is held rotatably on the axis of rotation. Accordingly, a rotationally fixed connection of the roller and the axis of rotation is to be provided in the case of a rotatable bearing of the axis of rotation in the support.
  • FIG. 1 shows a schematic side view of a textile machine equipped with a drafting device
  • FIG. 2 shows a perspective view of a detail of a drafting device according to the invention, wherein the rollers are in their resting positions;
  • FIG. 3 shows the detail according to FIG. 2 , wherein the rollers are in their load positions
  • FIG. 4 shows the detail according to FIG. 2 , wherein the rollers are in their intermediate positions
  • FIG. 5 shows a perspective view of an alternative embodiment of a detail of a drafting device according to the invention, wherein the rollers are also in their intermediate positions.
  • FIG. 1 shows an air spinning machine as an example of a textile machine 2 , which may be equipped with a drafting device 1 according to the invention.
  • the drafting device 1 according to the invention may also be used in a so-called drawing frame or in other spinning machines, for example, a ring spinning machine.
  • the air spinning machine shown as an example in FIG. 1 is preferably used to produce so-called roving 16 .
  • Roving 16 is yarn containing a relatively small amount of cover fibers, i.e., a yarn in which the winding fibers are wrapped relatively loosely around the inner core (preferably untwisted), so that the yarn remains twistable. This is crucial if the roving 16 thus produced is or must be twisted to be processable further accordingly (wherein this drafting device 1 may also be designed according to the present invention).
  • the air spinning machine comprises in general a drafting device 1 with at least two roller configurations arranged one after the other in a direction of transport T of the drafting device 1 , serving to twist a fiber structure 5 .
  • Each roller configuration comprises at least one roller 3 and a corresponding counter roller 4 , which is mounted to be rotatable about corresponding axes of rotation 7 and between which the fiber structure 5 can be passed with clamping (for reasons of simplicity, only one of the axes of rotation 7 of the rollers 3 and one of the axes of rotation 7 of the counter rollers 4 are provided with reference numerals).
  • the air spinning machine shown here in principle comprises a spinneret 21 at a distance from the drafting device 1 and having an interior eddy chamber (known from the prior art and therefore not illustrated here) and a yarn-forming element protruding into the eddy chamber, also known from the prior art and therefore not illustrated here.
  • the fiber sliver 5 and/or at least a portion of the fibers of the fiber sliver 5 is/are provided with a protective twist in the spinneret 21 .
  • the air spinning machine may have a draw-off unit 15 which preferably has two draw-off rollers 14 that can rotate about an axis of rotation 7 , as well as a bobbin device 18 for the roving 16 connected downstream from the draw-off unit 15 .
  • the bobbin device in turn preferably comprises a bushing drive 19 plus at least one bushing receptacle, which is known in principle and is connected to the bushing drive 19 and to which a bushing 17 can be secured and can be induced to rotate with the help of the bushing drive 19 in order to be able to wind the roving 16 , having been traversed by a traversing device 20 , onto the bushing 17 .
  • the air spinning machine operates according to a special air spinning method.
  • the fiber sliver 5 is guided in a transport direction T over an intake opening (not shown) into the eddy chamber of the spinneret 21 where it receives a protective twist, i.e., at least some of the fibers of the fiber sliver 5 are captured by an air stream generated by suitably positioned air jets. Some of the fibers are thereby pulled out of the fiber structure 5 at least some distance and wound around the tip of a yarn-forming element protruding into the eddy chamber.
  • the fibers of the fiber sliver 5 are drawn out of the eddy chamber over an intake opening of the yarn-forming element and a draw-off channel arranged inside the yarn-forming element and connected to the intake opening.
  • the free fiber ends here are also drawn onto a spiral path in the direction of the intake opening, and in doing so, are wrapped as winding fibers around the core fibers running centrally, thereby resulting in a roving 16 having the desired protective twist.
  • the roving 16 has a residual drawing capacity due to the only partial twist of the fibers, this residual drawing capacity being indispensable for further processing of the roving 16 in a downstream spinning machine, for example, a ring spinning machine.
  • a downstream spinning machine for example, a ring spinning machine.
  • conventional air spinning devices impart such a strong twist to the fiber sliver 5 that the necessary drawing after yarn production is no longer possible. In this case, this is also desirable because traditional air spinning machines are designed to produce a finished yarn, which should usually be characterized by a great strength.
  • FIG. 2 shows a detail of an drafting device 1 according to the invention, which can be used in the air spinning machine shown in FIG. 1 , for example.
  • the drafting device 1 comprises a plurality of rollers 3 and a plurality of counter rollers 4 , which correspond to the rollers 3 and each of which has a roller body 6 and an axis of rotation 7 , which serves to provide rotatable mounting of the respective roller body 6 , wherein the axes of rotation 7 are mounted in bearings 11 (merely indicated in FIGS. 2 and 3 ).
  • the bearing support of the axis of rotation 7 in the bearings 11 may be either rotatable or rotationally fixed.
  • the roller body 6 In the case of a rotationally fixed bearing of the axes of rotation 7 in the bearings 11 , the roller body 6 is held rotatably on the axis of rotation 7 . Accordingly, with a rotatable bearing support of the axis of rotation 7 in the bearing 11 , a rotationally fixed restraint of the roller body 6 on the axis of rotation 7 is to be provided.
  • FIG. 2 shows, among other things, that the rollers 3 are preferably mounted in a support 12 and that the counter rollers 4 are mounted in a corresponding counter support 9 .
  • the bearing support here is unilateral, i.e., the respective axes of rotation 7 each extend between only one of the two front ends 10 of the corresponding roller bodies 6 and the respective support 12 and/or counter support 9 (of course, each roller 3 or group of rollers 3 may be supported in a separate support 12 in order to be able to adjust the mutual spacings of the rollers 3 ; the same thing also applies according to the counter rollers and their counter supports 9 ).
  • FIG. 2 shows the condition of the drafting device 1 , in which the rollers 3 are in their resting position, i.e., the roller bodies 6 of the roller 3 and the counter roller 4 are not in contact.
  • the rollers 3 preferably assume this position while the drafting device 1 is stopped, such that the rollers 3 and/or counter rollers 4 are not driven and the fiber sliver 5 has been and/or is to be removed from the drafting device 1 .
  • the rollers 3 are moved into their load position shown in FIG. 3 , wherein this can take place, for example, by pivoting the support 12 about a pivot axis 13 (the pivot axis 13 is shown only in FIG. 3 ).
  • the axes of rotation 7 of the rollers 3 designed according to the invention shall have an orientation in an intermediate position as illustrated in FIG. 4 , which results in the roller bodies 6 of the roller 3 having a joint contact region 8 and the counter roller 4 having a common contact area 8 , which is smaller as seen in the axial direction of the axis of rotation 7 of the roller 3 than in the load position illustrated in FIG. 3 .
  • the roller bodies 6 of the roller 3 and the corresponding counter roller 4 preferably have only an essentially dot-shaped contact region 8 in the intermediate position wherein this can be implemented by the fact that the axes of rotation 7 of the roller 3 and counter roller 4 form an angle ⁇ in the aforementioned intermediate position, the size of this angle being different than 0° (reference is made to the general description with regard to advantageous angle sizes).
  • rollers 3 mounted in this way are moved out of their intermediate position and into their load position illustrated in FIG. 3 by pivoting the support 12 , then any play in the bearings 11 and/or a slight curving of the individual axes of rotation 7 are balanced in such a way that the pressing force is constant over the entire contact region 8 between the roller 3 and the counter roller 4 (ideal case).
  • a fiber sliver 5 guided with clamping between the corresponding roller bodies 6 is uniformly loaded here over its width so that the fiber sliver 5 can be drawn in a particularly homogeneous manner.
  • FIG. 4 illustrates an approach in which the axes of rotation 7 of the rollers 3 are mounted obliquely in the support 12 , and the support 12 can be pivoted about a pivot axis 13 running parallel to the axes of rotation 7 of the counter rollers 4
  • FIG. 5 shows an alternative embodiment which is characterized in that the axes of rotation 7 of the rollers 3 are aligned parallel with the pivot axis 13 of the support 12 .
  • both the pivot axis 13 of the support and the axes of rotation 7 of the rollers 3 form an angle ⁇ (shown in an exaggerated size in FIG.
  • roller bodies 6 of the rollers 3 and the counter rollers 4 each have only an essentially dot-shaped contact region 8 when the rollers 3 are in their intermediate position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US16/098,351 2016-05-02 2017-04-13 Drafting Device of a Textile Machine Abandoned US20190153629A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH00576/16A CH712427A1 (de) 2016-05-02 2016-05-02 Streckwerk einer Textilmaschine.
CH00576/16 2016-05-02
PCT/IB2017/052143 WO2017191515A1 (de) 2016-05-02 2017-04-13 Streckwerk einer textilmaschine

Publications (1)

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US20190153629A1 true US20190153629A1 (en) 2019-05-23

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US16/098,351 Abandoned US20190153629A1 (en) 2016-05-02 2017-04-13 Drafting Device of a Textile Machine

Country Status (6)

Country Link
US (1) US20190153629A1 (de)
EP (1) EP3452645A1 (de)
JP (1) JP2019516872A (de)
CN (1) CN109072495A (de)
CH (1) CH712427A1 (de)
WO (1) WO2017191515A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110004556B (zh) * 2019-04-17 2021-04-30 中国农业科学院兰州畜牧与兽药研究所 一种动物纤维的捻拉设备

Citations (8)

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US1742553A (en) * 1927-06-02 1930-01-07 Mottedewavrin Ets Pressure rollers for spinning machines and the like
US2246474A (en) * 1939-01-04 1941-06-17 Ver Kugellagerfabriken Ag Guiding arrangement for top weighting rolls
US2256193A (en) * 1939-08-10 1941-09-16 Gen Motors Corp Top roll
GB817765A (en) * 1956-08-21 1959-08-06 Mackie & Sons Ltd J Improvements relating to drawing frames and similar textile machines for the treatment of flax and like fibres
US3747863A (en) * 1970-05-02 1973-07-24 Akzona Inc Adjustable thread drawoff apparatus
US3918128A (en) * 1973-12-18 1975-11-11 Toyoda Automatic Loom Works Device for setting the intervening space between a bottom roller and a top roller of a roller assembly
US20060179615A1 (en) * 2002-06-20 2006-08-17 Firdausia Chehab Roller pair for stretching strips of filter material
US20150292127A1 (en) * 2012-12-28 2015-10-15 Kuraray Co., Ltd. Drawing device and drawing method

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FR74231E (de) * 1961-03-06
GB711425A (en) * 1951-04-04 1954-06-30 Tmm Research Ltd Improvements in supporting and weighting means for the upper rollers of textile drafting apparatus
CH330431A (de) * 1955-01-19 1958-06-15 Spinnerei Karl Marx Veb Oberwalzentrag- und -belastungsarm für Spinnereimaschinenstreckwerke
DE3902859A1 (de) * 1989-02-01 1990-08-09 Skf Textilmasch Komponenten Oberwalzentrag- und -belastungsarm fuer spinnereimaschinen-streckwerke
DE10159048A1 (de) * 2001-11-30 2003-06-18 Rieter Ag Maschf Spinnmaschine
DE10331759B4 (de) * 2003-07-14 2012-03-29 Trützschler GmbH & Co Kommanditgesellschaft Vorrichtung an einer Strecke für Textilfaserbänder mit Be- und Entlastung der Streckwerksoberwalzen
JP2006200069A (ja) * 2005-01-20 2006-08-03 Murata Mach Ltd 空気式精紡機におけるドラフト装置
CN202359256U (zh) * 2011-11-29 2012-08-01 上海淳瑞机械科技有限公司 一种转杯纺纱机的同步带张紧调节机构
DE102012014152A1 (de) * 2012-07-18 2014-01-23 Trützschler GmbH & Co Kommanditgesellschaft Vorrichtung an einer Spinnereimaschine, insbesondere Karde, Strecke Kämmmaschine, Bandwickler o. dgl. mit einem Streckwerk
CN103103645B (zh) * 2012-12-10 2015-06-24 苏州道众机械制造有限公司 一种纺织机械的微调罗拉
CN203593819U (zh) * 2013-11-22 2014-05-14 上海淳瑞机械科技有限公司 一种转杯纺纱机的皮辊配合调节机构

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1742553A (en) * 1927-06-02 1930-01-07 Mottedewavrin Ets Pressure rollers for spinning machines and the like
US2246474A (en) * 1939-01-04 1941-06-17 Ver Kugellagerfabriken Ag Guiding arrangement for top weighting rolls
US2256193A (en) * 1939-08-10 1941-09-16 Gen Motors Corp Top roll
GB817765A (en) * 1956-08-21 1959-08-06 Mackie & Sons Ltd J Improvements relating to drawing frames and similar textile machines for the treatment of flax and like fibres
US3747863A (en) * 1970-05-02 1973-07-24 Akzona Inc Adjustable thread drawoff apparatus
US3918128A (en) * 1973-12-18 1975-11-11 Toyoda Automatic Loom Works Device for setting the intervening space between a bottom roller and a top roller of a roller assembly
US20060179615A1 (en) * 2002-06-20 2006-08-17 Firdausia Chehab Roller pair for stretching strips of filter material
US20150292127A1 (en) * 2012-12-28 2015-10-15 Kuraray Co., Ltd. Drawing device and drawing method

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WO2017191515A1 (de) 2017-11-09
EP3452645A1 (de) 2019-03-13
CH712427A1 (de) 2017-11-15
CN109072495A (zh) 2018-12-21
JP2019516872A (ja) 2019-06-20

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