EP1048762A2 - Drive device for driving draft rollers in spinning machine - Google Patents
Drive device for driving draft rollers in spinning machine Download PDFInfo
- Publication number
- EP1048762A2 EP1048762A2 EP00108039A EP00108039A EP1048762A2 EP 1048762 A2 EP1048762 A2 EP 1048762A2 EP 00108039 A EP00108039 A EP 00108039A EP 00108039 A EP00108039 A EP 00108039A EP 1048762 A2 EP1048762 A2 EP 1048762A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- draft
- motor
- draft roller
- reverse rotation
- 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.)
- Withdrawn
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Classifications
-
- 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
- D01H5/32—Regulating or varying draft
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
- D01H1/14—Details
- D01H1/20—Driving or stopping arrangements
- D01H1/22—Driving or stopping arrangements for rollers of drafting machines; Roller speed control
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Abstract
Description
- The present invention relates to a drive device for driving draft rollers in a draft part of a spinning machine such as a spinning frame and, more particularly, the present invention relates to a drive device including a plurality of drive units for driving the draft rollers, at least one of the drive units having synchronous motor as a variable speed motor for driving the draft roller.
- A drive device for driving draft rollers of the above-mentioned type has been known, for example, from Japanese Unexamined Patent Publication (Kokai) No. 55-128024. In this known technique, three elongated draft rollers in the draft part of the spinning machine are connected to synchronous motors, respectively, and each of the synchronous motors is imparted with an output signal from a frequency generator via a frequency regulator and a frequency converter so that each draft roller is independently rotated synchronously with the signal.
- The above arrangement is advantageous in that the change of a rotational speed ratio between the draft rollers (the change of a draft ratio) can be very easily carried by using the frequency converter or the frequency regulator for controlling the former, and therefore, the operator is free from the troublesome operation for replacing gears for changing the draft ratio.
- There is a permanent magnet type synchronous AC motor, as a synchronous motor, which includes a stator and a rotor having permanent magnets and cage conductors. when the motor starts, the rotor is started to move by the torque derived as an induction motor from the cage conductors, and as the rotational speed rises and approaches a synchronous speed, a so-called "synchronous pull-in" occurs to pull the magnetic field of the rotor generated by the permanent magnet into step with the revolving field of the stator. This motor is advantageous in that heat loss and energy consumption are minimized since no current flows through the cage conductors of the rotor after the synchronous pull-in occurs.
- However, in the case where the synchronous motor of this type is adopted as a motor for driving draft rollers of a spinning machine, the following phenomenon occurs. A stop position of the rotor of the motor in the rotational direction (stop position of poles of the permanent magnets of the rotor) varies every time it stops, as shown in Figs. 7A and 7B in the attached drawings. In Figs. 7A and 7B, the
arrow 21A shows a field of the permanent magnet of the rotor, and thearrow 22A shows a revolving field of the stator; the arrow X shows the normal rotating direction of the rotor, and the arrow Y shows the reverse rotating direction of the rotor. Upon a start of the machine, if polarity of the revolvingfield 22A of the stator is opposite to that of thefield 21A of the permanent magnet of the rotor and the revolvingfield 22A of the stator is in front of thefield 21A of the permanent magnet the rotor in the normal rotational direction X, the rotor may be pulled in the normal rotational direction (see Fig. 7A), but if the positional relationship is reversed to that of Fig. 7A, the rotor is pulled in the reverse rotational direction to slightly rotate in reverse (see Fig. 7B). As a result, the draft roller driven by the reversely rotated synchronous motor also rotates in reverse whereby a fiber bundle is slackened or is pulled between that draft roller and another draft roller driven by the normally rotated synchronous motor, causing an undesirable or erroneous draft, leading to yarn breakage or a yarn fault. - Japanese Unexamined Patent Publication (Kokai) No. 7-3539 and Japanese Unexamined Utility Model Publication (Kokai) No. 59-113362, for example, discloses a drive device for driving draft rollers, which includes a ratchet mechanism for preventing a reverse rotation of a draft roller. The purpose of the ratchet mechanism in the above described documents is to prevent the reverse rotation of the draft roller caused by a torsional movement of the draft roller in the case where the draft roller is driven from one end thereof. These publications are not aimed at preventing a reverse rotation of the draft shaft, occurring with a reverse rotation of the synchronous motor upon starting the synchronous motor.
- An object of the present invention is to provide a drive device for driving draft rollers which includes a permanent magnet type synchronous AC motor, which is simple in construction, and which can minimize an undesirable draft which may occur upon starting the synchronous motor.
- The present invention provides a drive device for driving a plurality of draft rollers in a spinning machine, the drive device comprising a plurality of drive units for driving the draft rollers, each of the drive units having a variable speed motor and a transmission mechanism operatively connected to the variable speed motor for driving at least one draft roller, one of the variable speed motors comprising a synchronous AC motor having permanent magnets arranged therein. The drive device also comprises a reverse rotation preventing device arranged in the transmission mechanism operatively connected to the synchronous motor for preventing a reverse rotation of the associated draft roller, occurring with a reverse rotation of the synchronous motor caused by the action of the permanent magnets in the synchronous motor upon starting of the synchronous motor.
- In another feature of the present invention, the drive device also comprises a reverse rotation preventing device arranged in the transmission mechanism operatively connected to the synchronous motor for preventing a reverse rotation of the associated draft roller, occurring with a reverse rotation of the synchronous motor caused by the action of the permanent magnets in the synchronous motor upon a start of the synchronous motor, the transmission mechanism operatively connected to the synchronous motor having such a reduction ratio that the associated draft roller may otherwise be rotated in reverse to the extent to cause an undesirable draft.
- In the above arrangements, since the reverse rotation preventing device prevents the draft roller associated with the drive unit including the synchronous motor from rotating in reverse upon starting thereof due to the permanent magnets arranged in the motor, the degree of slackening and/or stretching of a fiber bundle becomes less between the draft roller and the normally rotating draft roller to reduce an occurrence of an undesirable draft, compared with the case where a reverse rotation preventing device is not provided.
- Preferably, the transmission mechanism operatively connected to the synchronous AC motor includes a gear attached to one end of the associated draft roller, and the other end of the associated draft roller is freely rotatable.
- Preferably, the reverse rotation preventing device comprises a ratchet wheel rotatable with the associated draft roller and a pawl engageable with the ratchet wheel.
- Preferably, the transmission mechanism operatively connected to the synchronous AC motor includes a shaft, and the ratchet wheel is attached to the shaft.
- Preferably, the pawl is swingeably supported by a machine frame and the reverse rotation preventing device further comprises an actuator to swingeably move the pawl, so that the pawl is maintained at a waiting position in which it is disengaged from the ratchet wheel when the draft roller is normally rotating and is brought into an operating position in which it is engaged with the ratchet wheel when the draft roller is stopped.
- Since the pawl is disengaged from the ratchet wheel during the operation of the spinning machine, a level of noise is lower than that in the case where the pawl is always engaged with the ratchet wheel and repeatedly touches the latter.
- Preferably, the draft rollers comprise a back draft roller, a middle draft roller and a front draft roller, and the drive units comprise a first drive unit for driving the back and middle draft rollers and a second drive unit for driving the front draft roller.
- Preferably, the reverse rotation preventing device is arranged in the transmission mechanism of the drive unit having the front draft roller.
- Preferably, the reverse rotation preventing device comprises a one-way clutch allowing only the normal rotation of the draft roller.
- The present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings in which:
- Fig. 1 is a perspective view of a drive device for driving draft rollers according to the embodiment of the present invention;
- Fig. 2 is a front view of the reverse rotation preventing device including a ratchet wheel and a pawl;
- Fig. 3 is a side cross-sectional view of the permanent magnet type synchronous AC motor;
- Fig. 4 is a cross-sectional view of the motor of Fig. 3, taken along the line IV-IV in Fig. 3;
- Fig. 5 is a schematic view of a part of the spinning machine, including a control system;
- Fig. 6 is a side cross-sectional view of the draft part; and
- Figs. 7A and 7B are views showing the relationship between the magnetic poles of the rotor and the revolving field of the stator.
-
- Fig. 1 illustrates a
draft part 2 of a spinning frame 1 (Fig. 5) which is a representative spinning machine. Here, thedraft part 2 includes two sets ofback draft rollers 3,middle draft rollers 4 andfront draft rollers 5. A drive device for driving thedraft rollers draft part 2 includes two drive units; one being a front roller drive unit 6 and the other being a back and middleroller drive unit 7. Eachdrive unit 6 or 7 has a synchronous motor M2 or M3, and a transmission mechanism operatively connected to the synchronous motor M2 or M3. - In the front roller drive unit 6, the rotation of the synchronous motor M2 having no speed reducing device is transmitted from an
output shaft 14 of the synchronous motor M2 to thefront draft rollers 5 via the transmission mechanism including belt drive devices 8 and adrive shaft 9. In the back and middleroller drive unit 7, the synchronous motor M3 is coupled to aspeed reducing device 10, and the rotation of the synchronous motor M3 is transmitted to thespeed reducing device 10, and from thespeed reducing device 10 to theback draft rollers 3 via the transmission mechanism, includingbelt drive devices 11 and agear train 12, and then to themiddle draft rollers 4 viagear trains 13. - Assuming that a draft ratio of the
draft part 2 is 40, the ratio of the rotational speed of theback draft roller 3 to the rotational speed of thefront draft roller 5 is 1:40, so thefront draft roller 5 rotates significantly faster. Accordingly, assuming that the synchronous motors M2 and M3 rotate at the same rotational speed, the ratio of the reduction ratio of the transmission mechanism of the back and middleroller drive unit 7 from the synchronous motor M3 to theback draft rollers 3 to the reduction ratio of the transmission mechanism of the front roller drive unit 6 from the synchronous motor M2 to thefront draft roller 5 is 1/40:1. Since the draft ratio between theback draft roller 3 and themiddle draft roller 4 is small and approximately 1.3, the reduction ratio of the front roller drive unit 6 is far smaller than that of the back and middleroller drive unit 7. - Therefore, in the back and middle
roller drive unit 7, the back andmiddle draft rollers front draft roller 5, which may causes an undesirable or erroneous draft between thefront draft roller 5 and themiddle draft roller 4. - In the front roller drive unit 6, a
ratchet wheel 15 is keyed to thedrive shaft 9 at an intermediate portion thereof, to constitute a reverse rotation preventing device T. As shown in Fig. 2, apawl 17 is pivotally supported at one end thereof by a machine frame F so that thepawl 17 is swingeable up and down to engage withteeth 16 of theratchet wheel 15. An intermediate portion of theratchet wheel 15 is connected to a tip end of apiston rod 19 of apneumatic cylinder 18 as an actuator for a rocking motion of thepawl 17. Thepiston rod 19 is biased by aspring 20 arranged in thecylinder 18 in the outwardly projecting direction. When the machine is operating (when the draft rollers are rotating), pressurized air is not supplied to thecylinder chamber 18a so that thepawl 17 is maintained at a waiting position A in which thepawl 17 is released from theratchet wheel 15. On the other hand, when the draft rollers are stopped, the pressurized air is supplied to thecylinder chamber 18a and thepawl 17 is brought into an operating position B in which the tip end of thepawl 17 is engaged with theteeth 16 of theratchet wheel 15. The engagement of theteeth 16 with thepawl 17 allows only the normal rotation of thedrive shaft 9 and thefront draft roller 5. - As shown in Figs. 3 and 4, the synchronous motors M2 and M3 comprise permanent magnet type synchronous AC motors. In each of the motors M2 and M3, a
stator 22 is provided integrally with the inner wall of ahousing 30. Thestator 22 has acore 22a formed of laminated steel sheets, and coils 22b arranged through thecore 22a in the up-down (axial) direction, to generate a revolving field by supplying an alternate current with a frequency thereof equal to that of the AC current. - The
output shaft 14 is rotatably supported bybearings 31 in the front and rear ends of thehousing 30. Arotor 21 is provided integrally with theoutput shaft 13 at a position radially opposite to the inside of thestator 22. Therotor 21 includes acore 21a formed of laminated thin steel sheets,aluminum cage conductors 21b surrounding the rotational axis of the motor at a circumferentially constant pitch and extending through thecore 21a in the form of a trapezoidal cross-section, and a pair ofpermanent magnets 21c embedded in therotor 21 inside thecage conductors 21b. The pair ofpermanent magnets 21c have N and S poles on the side facing thestator 22, respectively. There is a predetermined radial gap between therotor 21 and thestator 22 for facilitating the rotation of motor. - Fig. 5 shows the spinning frame 1 having spindles 40, a ring rail 41, the above-mentioned
draft part 2, and acontroller 50 for controlling them. A spindle drive system 43 for driving the spindles 40 includes a spindle drive motor M1 comprising an induction motor. The spindle drive system 43 from the spindle drive motor M1 to the spindles 40 includes areference pulse generator 44. Also, a ringrail lifting device 45 includes a ring rail drive motor M4 comprising an induction motor. - Motors M1 to M4 are connected to inverters INV1 to INV4, respectively. The inverters INV1 to INV4 are controlled by commands issued from the
controller 50. Thecontroller 50 is imparted from outside with spinning conditions such as a rotational speed of the spindles, a draft ratio, a twist number and a layer pitch. When the spindle drive motor M1 is rotated via the inverter INV1 to establish a given spindle rotational speed, thereference pulse generator 44 detects the rotation thereof and issues a reference pulse "a" corresponding to the spindle rotational speed to thecontroller 50. Thecontroller 50 calculates rotation commands to be input to the remaining inverters INV2 to INV4 to satisfy the spinning conditions, based on the reference pulse "a" and the spinning conditions, and issues rotation control commands to the inverters INV2 to INV4, respectively. - The inverters INV2 to INV4 supply frequency-controlled alternating electric power to the corresponding drive motors M2 to M4, according to these control commands. The rotational speeds of the drive motors M2 to M4 are controlled in accordance with the given frequencies to satisfy the above spinning conditions. In this regard,
reference numerals 51 to 53 denote rotational speed detecting means for detecting the rotational speeds of the ringrail lifting device 45, the front roller drive unit 6, and the back and middleroller drive unit 7, respectively, for inputting the detected values to thecontroller 50 which in turn monitors the occurrence of operational abnormality of the machine by determining whether or not the detected values coincide with the rotation commands issued from thecontroller 50. - When the machine is stopped, the pressurized air is supplied into the
cylinder chamber 18a to bring thepawl 17 into the operating position B in which thepawl 17 engages with theteeth 16 of theratchet wheel 15. when the machine is started and the spindle drive motor M1 begins to rotate by the command from thecontroller 50, thereference pulse generator 44 generates the reference pulse "a", as stated before, and the speed control commands are issued from thecontroller 50 based on this reference pulse and the spinning conditions given in advance, so that frequency-controlled alternate electric power is supplied to the remaining motors M2 to M4 via the inverters INV2 to INV4. The motors M2 to M4 are thus rotated. - In the two synchronous motors M2 and M3, alternate electric power, the frequency of which is controlled, is supplied to the
coil 22b of thestator 22 by the inverters INV2 and INV3. Therefore, a revolving field is generated in thecoil 22b of thestator 22. An induced current flows through thecage conductors 21b of therotor 21, based on the revolving field, to generate a field which generates, with the revolving field, a motor starting torque, whereby therotor 21 or theoutput shaft 14 begins to rotate in the normal direction, causing thefront draft roller 5, theback draft roller 3 and themiddle draft roller 4 to rotate in the normal direction. At this time, thepawl 17 in the operating position B repeatedly disengages relative to theteeth 16 of theratchet wheel 15 while compressing the pressurized air in thecylinder chamber 18a. After a time period preset by a timer (not shown) has lapsed from start-up of the rotation, the pressurized air supplied to thecylinder 18 is removed whereby thepawl 17 is displaced to the waiting position A by the bias of thespring 20 to disengage from theteeth 16 of theratchet wheel 15. Thus, no engagement occurs between thepawl 17 and theteeth 16 and no noise is generated during the rotation of the draft rollers. When therotor 21 is accelerated closer to the synchronous speed, the difference between the speed of the revolving field and the rotational speed of thepermanent magnets 21c becomes extremely small, and the magnetic field of thepermanent magnets 21c is pulled into the revolving field (the synchronous pull-in phenomenon), resulting in the synchronous rotation. By supplying an alternate electric power of a low frequency through the inverters INV2 and INV3 at a starting stage, the synchronous pull-in occurs while the speed of the revolving field of thestator 22 is at a low level. When the synchronous rotation has been established, no induced current flows through thecage conductors 21b of therotor 21, whereby no heat is generated to attain energy saving, unlike the conventional induction motor in which an induced current always flows through the rotor to generate heat. - In this way, the
draft rollers 3 to 5 rotate so as to realize the given draft ratio, the ring rail 41 repeats the lifting motion to realize the given layer pitch, and the spindles 40 rotate to realize the given twist. - When the synchronous motors M2 and M3 start to rotate, the
rotor 21 may rotate reverse to the normal rotational direction due to magnetic attraction of thepermanent magnets 21c of therotor 21 toward the revolving field of thestator 22, if a polarity of the revolving field is different from that of thepermanent magnets 21c of therotor 21 and the revolvingfield 22A of thestator 22 is in front of thefield 21A of thepermanent magnets 21c of therotor 21 in the rotational direction Y which is reverse to the normal rotational direction X (see Fig. 7B). The reverse rotation of the motor is not so serious in the back and middleroller drive unit 7 because the reduction ratio thereof is large and the back anddraft rollers front draft roller 5 is rotated in reverse to such an extent that an undesirable or erroneous draft would occur between thefront draft roller 5 and themiddle draft roller 4. - However, according to the present invention, the
ratchet wheel 15 is engaged with thepawl 17 and thedrive shaft 9 is unable to rotate in reverse, so thefront draft roller 5 is prevented from rotating in reverse and a risk of slack in the fiber bundle caused by the reverse rotation of thefront draft roller 5 is avoided. Upon the start of the machine, themiddle draft roller 4 begins to rotate in the normal direction, while thefront draft roller 5 is stopped, slack in the fiber bundle (see P2 in Fig. 6) may occur between thefront draft roller 5 and themiddle draft roller 4. However, the amount of such a slack P2 in the fiber bundle will be smaller than that slack in the fiber bundle (see P1 in Fig. 6) in the prior art in which themiddle draft roller 4 normally rotates and thefront draft roller 5 reversely rotates. The synchronous motor M2 in the front roller drive unit 6 is subsequently rotated in the normal direction to thereby drive thefront draft roller 5 to rotate in the normal direction. Thus, the drafting operation is carried out in thedraft part 2. Since the slack in the fiber bundle is small, as described above, the risk of undesirable or erroneous drafting due to the slack is small. Needless to say, thepawl 17 is returned to the waiting position A, after a predetermined time period has lapsed from the time in which the synchronous motor M2 is rotated in the normal direction. - In the above embodiment, a mechanism including the
ratchet wheel 15 and thepawl 17 engageable therewith is used as a reverse rotation preventing device, but it is possible to modify the reverse rotation preventing device from the illustrated example. For example, it is possible to use a one-way clutch of a well-known type between the drive shaft and the machine frame, allowing the drive shaft to rotate only in the normal direction. - Also, in the above mentioned embodiment, in the spinning frame, a reverse rotation preventing device is not provided in the back and middle
roller drive unit 7 since the back and middleroller drive unit 7 has a greater reduction ratio, but it is possible to provide a reverse rotation preventing device in the back and middleroller drive unit 7 if the reduction ratio of thedrive unit 7 from the synchronous motor M3 to the back andmiddle draft rollers permanent magnets 21a causes the back andmiddle draft rollers front draft roller 5 rotates in the normal direction and themiddle draft roller 4 is prevented from rotating in reverse. Even in such a case, the fiber bundle present between the middle andfront draft rollers front draft roller 5 normally rotates and themiddle draft roller 4 reversely rotates. Thus, in this case too, an undesirable or erroneous draft is also mitigated. While both of the front roller drive unit 6 and the back and middleroller drive unit 7 are provided with synchronous motors, respectively, as a drive source in this embodiment, a servo-motor may be used as a drive motor for the back and middleroller drive unit 7. - As described above, according to the present invention, a draft roller drive device employs a synchronous AC motor having permanent magnets which is advantageous in having a lower energy consumption and less heat loss. While the motor of this type may reversely rotate at a start thereof due to the permanent magnets arranged therein, a reverse rotation preventing device provided in the drive device for driving draft rollers including the synchronous motor prevents the draft roller from reversely rotating, whereby the fiber bundle present between that draft roller and another draft roller which normally rotates is less pulled or slackened than in the case where no reverse rotation preventing device is provided, to reduce an undesirable or erroneous draft.
- Since the pawl is disengaged from the ratchet wheel in the reverse rotation preventing device when the textile machine is operating, noise is suppressed compared with the case where the pawl is always engaged with the ratchet wheel.
Claims (9)
- A drive device for driving a plurality of draft rollers in a spinning machine, said drive device comprising:a plurality of drive units for driving the draft rollers, each of said drive units having a variable speed motor and a transmission mechanism operatively connected to said variable speed motor for driving at least one draft roller;one of the variable speed motors comprising a synchronous AC motor having permanent magnets arranged therein; anda reverse rotation preventing device arranged in the transmission mechanism operatively connected to said synchronous motor for preventing a reverse rotation, of the associated draft roller, occurring with a reverse rotation of said synchronous motor caused by the action of the permanent magnets in the synchronous motor upon starting the synchronous motor.
- A drive device for driving a plurality of draft rollers in a spinning machine, said drive device comprising:a plurality of drive units for driving the draft rollers, each of said drive units having a variable speed motor and a transmission mechanism operatively connected to said variable speed motor for driving at least one draft roller;one of the variable speed motors comprising a synchronous AC motor having permanent magnets arranged therein; anda reverse rotation preventing device arranged in the transmission mechanism operatively connected to said synchronous motor for preventing a reverse rotation, of the associated draft roller, occurring with a reverse rotation of said synchronous motor caused by the action of the permanent magnets in the synchronous motor upon starting the synchronous motor, said transmission mechanism operatively connected to said synchronous motor having such a reduction ratio that said associated draft roller may otherwise be rotated in reverse to an extent to cause an undesirable draft.
- A drive device according to claim 1 or 2, wherein said transmission mechanism operatively connected to said synchronous AC motor includes a gear attached to one end of the associated draft roller, and the other end of said associated draft roller is freely rotatable.
- A drive device according to claim 1 or 2, wherein said reverse rotation preventing device comprises a ratchet wheel rotatable with the associated draft roller and a pawl engageable with the ratchet wheel.
- A drive device according to claim 4, wherein said transmission mechanism operatively connected to said synchronous AC motor includes a shaft, and said ratchet wheel is attached to said shaft.
- A drive device according to claim 5, wherein the pawl is swingeably supported by a machine frame and said reverse rotation preventing device further comprises an actuator to swingeably move the pawl, so that the pawl is maintained at a waiting position in which it is disengaged from the ratchet wheel when the draft roller is normally rotating and is brought into an operating position, in which it is engaged with the ratchet wheel, when the draft roller is stopped.
- A drive device according to claim 1 or 2, wherein said draft rollers comprise a back draft roller, a middle draft roller and a front draft roller, and said drive units comprise a first drive unit for driving the back and middle draft rollers and a second drive unit for driving the front draft roller.
- A drive device according to claim 7, wherein said reverse rotation preventing device is arranged in the transmission mechanism of the drive unit driving the front draft roller.
- A drive device according to claim 1 or 2, wherein said reverse rotation preventing device comprises a one-way clutch allowing only the normal rotation of the draft roller.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11115966A JP2000303269A (en) | 1999-04-23 | 1999-04-23 | Draft roller-driving device in spinning machine |
JP11596699 | 1999-04-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1048762A2 true EP1048762A2 (en) | 2000-11-02 |
EP1048762A3 EP1048762A3 (en) | 2001-01-17 |
Family
ID=14675554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00108039A Withdrawn EP1048762A3 (en) | 1999-04-23 | 2000-04-20 | Drive device for driving draft rollers in spinning machine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1048762A3 (en) |
JP (1) | JP2000303269A (en) |
CN (1) | CN1273287A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114323942A (en) * | 2021-12-24 | 2022-04-12 | 盐城金科亚麻纺织有限公司 | Cotton sliver traction stretching device for flax preparation |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10161522A1 (en) * | 2001-12-14 | 2003-06-18 | Rieter Ag Maschf | Spinning machine has controlled drive for drawing unit cylinders, using frequency converter set by machine control, together with start unit at computer to vary predraft action |
JP4670522B2 (en) * | 2005-07-19 | 2011-04-13 | 株式会社豊田自動織機 | Draft device in spinning machine |
CN104862831B (en) * | 2015-06-17 | 2017-07-21 | 南通市金山纺织有限公司 | Spinning frame roller gear |
CN108385217A (en) * | 2018-05-10 | 2018-08-10 | 葛陈鹏 | Digitally-controlled spinning frame headstock driver |
CN109825907B (en) * | 2019-03-13 | 2023-09-19 | 安徽新雅新材料有限公司 | Alternating drafting four-way spinning device and spinning method of variable-count variable-ratio variable-twist yarn |
CN114351309B (en) * | 2021-12-06 | 2023-03-21 | 广东职业技术学院 | Preparation method of equal linear density yarn with variable blending ratio |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4332059A (en) * | 1978-09-29 | 1982-06-01 | Rieter Machine Works Limited | Drive for drafting arrangement rolls of long spinning machines |
US4987734A (en) * | 1988-02-12 | 1991-01-29 | Rieter Machine Works, Ltd. | Ring spinning machine |
US5438733A (en) * | 1991-12-12 | 1995-08-08 | Trutzschler Gmbh & Co. Kg | Cotton drafting frame |
-
1999
- 1999-04-23 JP JP11115966A patent/JP2000303269A/en active Pending
-
2000
- 2000-04-20 EP EP00108039A patent/EP1048762A3/en not_active Withdrawn
- 2000-04-21 CN CN 00106797 patent/CN1273287A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4332059A (en) * | 1978-09-29 | 1982-06-01 | Rieter Machine Works Limited | Drive for drafting arrangement rolls of long spinning machines |
US4987734A (en) * | 1988-02-12 | 1991-01-29 | Rieter Machine Works, Ltd. | Ring spinning machine |
US5438733A (en) * | 1991-12-12 | 1995-08-08 | Trutzschler Gmbh & Co. Kg | Cotton drafting frame |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114323942A (en) * | 2021-12-24 | 2022-04-12 | 盐城金科亚麻纺织有限公司 | Cotton sliver traction stretching device for flax preparation |
Also Published As
Publication number | Publication date |
---|---|
EP1048762A3 (en) | 2001-01-17 |
JP2000303269A (en) | 2000-10-31 |
CN1273287A (en) | 2000-11-15 |
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