US3457597A - Roller drafting system for spinning machinery - Google Patents

Roller drafting system for spinning machinery Download PDF

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Publication number
US3457597A
US3457597A US667963A US3457597DA US3457597A US 3457597 A US3457597 A US 3457597A US 667963 A US667963 A US 667963A US 3457597D A US3457597D A US 3457597DA US 3457597 A US3457597 A US 3457597A
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United States
Prior art keywords
roller
drafting
rollers
bottom roller
top roller
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.)
Expired - Lifetime
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US667963A
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English (en)
Inventor
Takuzo Tooka
Hidejiro Araki
Manji Nagai
Choji Nozaki
Junzo Hasegawa
Susumu Kawabata
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.)
Toyota Industries Corp
Toyota Central R&D Labs Inc
Original Assignee
Toyota Central R&D Labs Inc
Toyoda Automatic Loom Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyota Central R&D Labs Inc, Toyoda Automatic Loom Works Ltd filed Critical Toyota Central R&D Labs Inc
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Publication of US3457597A publication Critical patent/US3457597A/en
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Expired - Lifetime 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
    • D01H5/22—Drafting machines or arrangements without fallers or like pinned bars in which fibres are controlled by rollers only

Definitions

  • a high-speed roller drafting system for a draw frame comprising a main drafting zone including five rollers, a front top roller in contact with and driven through a front bottom drive roller, a second and third top roller, respectively, in contact with and driven through a second bottom drive roller, the front top roller being smaller in diameter than the front bottom roller and the second top roller being smaller in diameter than each of the front top roller and the second bottom roller, said rollers of the main zone being so arranged that the extension of a straight line drawn from the center of the third top roller to the center of the second bottom roller intersects the extension of a straight line drawn from the center of the front top roller to the center of the front bottom roller, the nip between the second bottom roller and the second top roller being below the tangent drawn from the nip between the front top roller
  • This invention relates to an improved roller drafting system especially applicable to the main drafting zone for a drawframe, in the spinning of cotton, or staple fiber yarn.
  • the primary object of the invention is to provide a roller drafting system for spinning machinery capable of operating at very high speed without detriment to the quality of the sliver and so arranged as to avoid bearing and other drive problems.
  • Another object of the invention is to provide a roller drafting system in which a second top roller of smaller diameter than conventional is driven from a bottom drive roller rather than from a top drive roller as in conventional apparatus.
  • a further object of the invention is to provide a roller drafting system in which the curvilinear arc of fiber touch at the input side of the front draft zone is lengthened while the curvilinear arc of fiber touch at the output side of said zone is reduced for better drafting action.
  • Yet another object of the invention is to provide a roller drafting system in which the rollers are so positioned as to yield capability of adjustment of the free length of fiber in the front drafting zone.
  • the system facilitates the adjustment of the roller 'ice setting or the distance between the roller nips in the front drafting zone, when changing the drafted material;
  • the system can be operated in a stable state because the forward direction of the delivery is inclined downwardly and because the adhesion, or the winding,
  • the system can be easily equipped with a sliver thickness regulator
  • FIG. 1 is a diagram illustrating a preferred embodiment of the invention
  • FIGS. 2 and 3 are fragmentary diagrams illustrating technical principles used or applied to the invention.
  • FIG. 4 is a diagram showing a conventional r-oller drafting system for comparison with the invention.
  • FIGS. 5 and 6 are diagrams similar to FIG. 1, but illustrating other preferred embodiments according to the invention.
  • FIG. 1 a preferred embodiment of the invention is diagrammed in FIG. 1 as comprising a roller drafting system for a drawframe with a five over four roller arrangement, the construction, elements, drives, etc., being conventional except for the differences mentioned hereinafter.
  • the four bottom rollers 1, 3, 6 and 8 are driven in a conventional manner from a driving shaft (not shown).
  • the five top rollers 2, 4, 5, 7 and 9 are driven by friction from the bottom rollers.
  • the main drafting zone M is composed of five rollers 2, 1, 4, 3 and 5 so arranged and proportioned that the front top roller 2 has a smaller diameter than the front bottom roller 1 and is in contact with and driven by friction through said front bottom roller; the second top roller 4 has a smaller diameter than each of the front top roller 2 and the second bottom roller 3 and is in contact with and driven by friction through said second bottom roller; the extension of a straight line PQ drawn from the center of rotation P of the third top roller 5 in the direction of and through the center of rotation Q of the second bottom roller 3 intersects the extension of the straight line element RS drawn from the center of rotation R of the front top roller 2 in the direction of and through the center of rotation S of the front bottom roller 1; the point of contact a between the second bottom roller 3 and the second top roller 4' is positioned below the tangent bf drawn from the point of contact b to the upper side.
  • the third and fourth top rollers 5 and 7 are in contact respectively with the second and third bottom rollers 3 and 6 and are driven by fraction through said bottom rollers.
  • the back top roller 9 is in contact with the back bottom roller 8 and is driven by friction through said back bottom roller.
  • the arrow indicates the direction of flow of the sliver B.
  • the diameter of the front bottom roller 1 is increased according to the invention, so that the delivery speed may be increased while the revolutions per minute are kept below a certain value.
  • the diameter of the front bottom roller 1 is increased to 60 mm., and for a delivery speed of 500 M./min. it is only necessary to raise the speed of the front roller 1 to 2,660 rpm.
  • the second top roller 4 is made smaller in diameter than the front top roller 2, said second top roller 4 can be installed in the space between the front bottom roller 1, the front top roller 2, and the second bottom roller 3, and the setting ab of the front drafting zone, namely, the fiber pass from the point of contact a between the rollers 4 and 3 on the input side to the point of contact 1; between the rollers 2 and 1 on the output side, can be considerably shortened, so that the formation of the drafting wave is not increased even though the diameter of the front bottom roller 1 has been increased.
  • the extension of the straight line PQ drawn from the center of the third top roller 5 in the direction of the center of the second bottom roller 3 intersects the extension of the straight line RS drawn from the center R of the front top roller 2 in the direction of the center of the front bottom roller 1, the point of contact a "between the rollers 4 and 3 is placed below the tangent bf drawn from the point of contact b between the rollers 2 and 1 to the upper side of the second bottom roller 3, and the tangent be drawn from the point of contact b between the rollers 2 and 1 to the lower side of the second top roller 4 is substantially perpendicular to the straight line RS.
  • the sliver B is in curvilinear contact with the surface of the second top roller 4 in the are ac at the input side of the front drafting zone, while the sliver B has no curvilinear contact at the output side of the front drafting zone, or has only a small curvilinear contact in the arc bd on the front bottom roller 1 or on the front top roller 2.
  • the second top roller 4 may be varied somewhat in position, as for example to occupy the broken line position of FIG. 1 without departing materially from the inventive concept and improved results.
  • FIG. 2 and FIG. 3 indicate theoretic roller systems drafting sliver B in the direction of the arrow. While the bottom rollers 1 and 3' are driven by a driving shaft, each of the top rollers 2 and 4' is in contact with either the bottom roller 1' or 3' and driven by friction through the roller 1 or 3' respectively.
  • the speed change at which such a fiber is abruptly accelerated from the low-speed to the surface speed of the front rollers 1' and 2', or so-called high-speed, concentrates sharply around a point near the nip point b, resulting in drafting action and very little irregularity due to the drafting wave.
  • the number of fibers touching the arc db' at a given time is smaller than the number of fibers touching the arc a'c', so that it is indefinite at what point the fibers are accelerated; in other words, the high-speed fibers on the curvilinear arc db' are increased in number as well as speed, but most of the above-mentioned floating fibers tend to accelerate and run at high-speed when more fibers are nipped by the front nip point b, while most of the floating fibers do not accelerate, but tend to run at low-speed when less fibers are nipped by the front nip point b'. Therefore, the FIG. 3 construction has the disadvantage that, the speed change points are distributed over a wider range, and the irregularity of the sliver is increased by the additional formation of the drafting wave.
  • the present invention contemplates that a curvilinear arc of fiber touch ac is placed at the input side of the front draft zone and the curvilinear arc of fiber touch db at the output side is diminished or kept very short so that better drafting action may be accomplished with less formation of drafting wave.
  • the inventive system provides for adjustment of free length cd to maintain the above-mentioned conditions of fiber touch on the curvilinear arcs at both the input side and the output side of the front drafting zone, without any adjustment of the second bottom roller 3. This is done by making the second top roller 4 adjustably movable from the solid line position of FIG. 1 to the broken line position in FIG. 1, for instance, while still maintaining its surface contact with the second bottom roller 3, and out of contact with any other rollers.
  • the roller to be shifted for obtaining the optimum free length is the second top roller 4 in the driven roller side.
  • the setting ab in the front drafting zone can be adjusted according to the staple length of the fiber material without shifting either bottom roller 1 or 3 in the driving roller side. Therefore, this arrangement provides a simple yet sturdy drafting system, is very easy to handle, and yields the advantage of rapid adjustability of settings for free length of fiber according to the mean staple length of the material being processed.
  • each the third bottom roller 6, the fourth top roller 7, the back bottom roller 8, and the back top roller 9 for the five over four roller drafting system on a super high speed and high draft drawframe according to the invention shown in FIG. 1.
  • This is especially so as to the back bottom roller 8 and the back top roller 9 and to mesh one of them with the other so as to grip the sliver more firmly, and for better control of the sliver drafted.
  • the second bottom roller 3, the third bottom roller 6, and the back bottom roller 8 have equal diameters to make possible the convenience of their mutual exchange. This also applies to the third top roller 5, the fourth top roller 7 and the back top roller 9.
  • the direction of the tangent of the front bottom roller 1 and of the front top roller 2 at the point of contact b can be changed through a wide range to suit process demands, by swinging the assembly of the front bottom roller 1, the front top roller 2, and the second top roller 4 around the axis Q of the second bottom roller 3.
  • the sliver from the roller drafting system is delivered through a coiler (not shown, but placed forwardly and downwardly) and then stored in a can.
  • the sliver in the form of web as delivered between the front bottom roller 1 and the front top roller 2 runs in the direction of the tangent at the point of contact b.
  • the momentum of the running sliver is so large that it is not desirable, from the viewpoint of stability, to guide the sliver through the coiler which is offset from said tangent.
  • the roller drafting system according to the invention therefore, improves the stability of the operation, because the direction of said tangent can be changed through a wide range without affecting the composition of the front drafting rollers.
  • the fibers tend to flow forward and downward at an angle with the tangent drawn at the point of contact between the rollers 12 and 11 owing to the weight of the fibers. So that the fibers may be deposited between the second bottom roller 10 and the third bottom roller 11, it becomes necessary to remove the second top roller 12, to guide the deposited fibers to the nip between the front bottom roller 1" and the front top roller 2", and then to re-start the machine.
  • the initiation, or starting operation involves two steps, with resulting delay and unsmoothness of a sliver when new slivers are lapped in.
  • the locus of the fibers ejected from the third top roller 5 deviates downward from the tangent of the third top roller 5 and the second bottom roller 3 at the point of contact e due to the gravitational force and reaches the surface of the second top roller 4 along the surface of the second bottom roller 3.
  • the fibers ejected from the second top roller 4 also tend to flow downward, the fibers are carried on the surface of the front bottom roller 1 whose upper surface is running forward and then nipped by the front top roller 2.
  • the fibers automatically reach the nip between the front bottom roller 1 and the front top roller 2, simply by supplying the fibers B to the nip between the back bottom roller 8 and the back top roller 9. It is an advantageous feature of this invention that the initiation is performed very smoothly in such a way, and with only one step.
  • the tendency toward fiber adhesive, or winding, on the front bottom roller is a big problem particularly in high speed operations.
  • the use of the front bottom roller 1 with a larger than conventional diameter in the invention is very elfective for preventing such trouble.
  • the revolutions per minute of the front bottom roller must be higher than conventional. Therefore, to increase the speed of conventional machines the regulating systems of the front rollers should be reformed for higher revolutions per minute, but this is rather difficult. In the present invention, it is not necessary to increase the revolutions per minute of the front bottom roller 1 up to as high a level, even for a super high speed operation of the drawframe, because of the larger diameter of said roller. Thus, the regulating system may be attached to the drawframe without major reconstruction. This is also an advantage of the invention.
  • the fourth top roller 7 is reduced in diameter and the center of said roller 7" is placed more forward, while the center of the third bottom roller 6 is placed back of the center of the fourth top roller 7".
  • the back bottom roller 8 is placed higher than the same roller 8 shown in FIG. 1, and the center of the back top roller 9 is placed in front of the center of the back bottom roller 8.
  • the back drafting zone is composed of the rollers 7" and 6 and the back rollers 9 and 8.
  • the system is so arranged that the intermediate and back drafting zones are inclined upwardly toward the rear, the back bottom roller 8 being placed slightly above the third bottom roller.
  • This arrangement is used when required by space and other factors, and there is no difference in result or principle from the FIG. 1 embodiment.
  • the drafting zone back of the third bottom roller 6 and the drafting zone in front of the second bottom roller 3 can be relatively inclined through an arbitrary angle with considerable freedom, without changing the composition of the drafting zone between rollers 6 and 3. It is thus a feature of the invention that each drafting zone can be fore, is not to be restricted except insofar as is necessitated by the prior art and by the spirit of the appended claims.
  • a roller drafting system for spinning machinery comprising a main drafting zone including a front top roller in contact with and driven through a front bottom drive roller, and second and third top rollers respectively in contact with and driven through a second bottom drive roller, and an intermediate drafting zone including said second bottom and third top rollers, and a fourth top roller in contact with and driven by a third bottom drive roller, the front top roller being smaller in diameter than the front bottom roller and the second top roller being smaller in diameter than each of the front top roller and the second bottom roller, the second top roller being adjustably movable along the surface of the second bottom roller, said rollers of the main zone being so arranged that the extension of a straight line drawn from the center of the third top roller to the center of the second bottom roller intersects the extension of a straight line drawn from the center of the front top roller to the center of the front bottom roller, the point of contact between the second bottom roller and the second top roller being below the tangent drawn from the point of contact between the front top roller and the front bottom roller to the upper side of the second bottom roller so

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US667963A 1966-10-12 1967-09-15 Roller drafting system for spinning machinery Expired - Lifetime US3457597A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6759666 1966-10-12

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US3457597A true US3457597A (en) 1969-07-29

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US667963A Expired - Lifetime US3457597A (en) 1966-10-12 1967-09-15 Roller drafting system for spinning machinery

Country Status (6)

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US (1) US3457597A (fr)
BE (1) BE704966A (fr)
CH (1) CH476866A (fr)
DE (1) DE1710023A1 (fr)
GB (1) GB1181265A (fr)
NL (1) NL6713842A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5018248A (en) * 1988-08-09 1991-05-28 Hollingsworth (U.K.) Limited Drafting apparatus with autolevelling
WO2009060298A3 (fr) * 2007-11-09 2009-07-16 Atex Spa Unité d'étirage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3542355A1 (de) * 1985-11-29 1987-06-04 Zinser Textilmaschinen Gmbh Streckwerk einer spinnereimaschine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH79594A (de) * 1917-04-11 1918-12-02 Heinrich Meier Walzenstreckwerk für Baumwolle
GB127702A (en) * 1918-05-31 1919-06-12 Henry Philips Greg Improvements in or appertaining to the Drawing of Cotton or like Yarns or Fibres in Spinning, Doubling or Preparing Machines.
US1579414A (en) * 1924-10-18 1926-04-06 Meinrad F Thoma Drawing mechanism
US1583893A (en) * 1926-01-29 1926-05-11 Meier Heinrich Drawing mechanism
US2076609A (en) * 1935-06-28 1937-04-13 Julian T Hightower Drawing mechanism
GB642419A (en) * 1946-09-09 1950-09-06 Jose Mateu Termens Improvements in drafting mechanisms for textile fibres for use with spinning machines
US2624919A (en) * 1951-05-02 1953-01-13 Whitin Machine Works Means to prevent the accumulation of waste in drafting systems

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH79594A (de) * 1917-04-11 1918-12-02 Heinrich Meier Walzenstreckwerk für Baumwolle
GB127702A (en) * 1918-05-31 1919-06-12 Henry Philips Greg Improvements in or appertaining to the Drawing of Cotton or like Yarns or Fibres in Spinning, Doubling or Preparing Machines.
US1579414A (en) * 1924-10-18 1926-04-06 Meinrad F Thoma Drawing mechanism
US1583893A (en) * 1926-01-29 1926-05-11 Meier Heinrich Drawing mechanism
US2076609A (en) * 1935-06-28 1937-04-13 Julian T Hightower Drawing mechanism
GB642419A (en) * 1946-09-09 1950-09-06 Jose Mateu Termens Improvements in drafting mechanisms for textile fibres for use with spinning machines
US2624919A (en) * 1951-05-02 1953-01-13 Whitin Machine Works Means to prevent the accumulation of waste in drafting systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5018248A (en) * 1988-08-09 1991-05-28 Hollingsworth (U.K.) Limited Drafting apparatus with autolevelling
WO2009060298A3 (fr) * 2007-11-09 2009-07-16 Atex Spa Unité d'étirage

Also Published As

Publication number Publication date
NL6713842A (fr) 1968-04-16
CH476866A (fr) 1969-08-15
BE704966A (fr) 1968-04-11
GB1181265A (en) 1970-02-11
DE1710023A1 (de) 1971-10-21

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