EP3124658A1 - Drafting device for spinning frame - Google Patents
Drafting device for spinning frame Download PDFInfo
- Publication number
- EP3124658A1 EP3124658A1 EP16179877.2A EP16179877A EP3124658A1 EP 3124658 A1 EP3124658 A1 EP 3124658A1 EP 16179877 A EP16179877 A EP 16179877A EP 3124658 A1 EP3124658 A1 EP 3124658A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- apron
- roller
- roving
- pair
- contact pressure
- 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.)
- Granted
Links
- 238000009987 spinning Methods 0.000 title claims description 18
- 239000000835 fiber Substances 0.000 abstract description 22
- 238000000926 separation method Methods 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 description 23
- 238000010168 coupling process Methods 0.000 description 23
- 238000005859 coupling reaction Methods 0.000 description 23
- 230000037431 insertion Effects 0.000 description 8
- 238000003780 insertion Methods 0.000 description 8
- 230000009849 deactivation Effects 0.000 description 5
- 230000004913 activation Effects 0.000 description 3
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 3
- 241000237858 Gastropoda Species 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
Images
Classifications
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/34—Yarns or threads having slubs, knops, spirals, loops, tufts, or other irregular or decorative effects, i.e. effect yarns
-
- 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
- D01H5/26—Drafting machines or arrangements without fallers or like pinned bars in which fibres are controlled by one or more endless aprons
-
- 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
- D01H5/36—Regulating or varying draft according to a pre-arranged pattern, e.g. to produce slubs
-
- 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
- D01H5/86—Aprons; Apron supports; Apron tensioning arrangements
- D01H5/88—Cradles; Tensors
Definitions
- the present invention relates to a drafting device for a spinning frame that spins a strand of yarn while changing the combination ratio of a first roving and a second roving.
- a drafting device 100 includes front rollers 101, middle apron pairs 102, and back apron pairs 103.
- the middle apron pairs 102 and the back apron pairs 103 are located at the rear of the front rollers 101.
- Each middle apron pair 102 feeds a first roving S11 to the front rollers 101.
- Each back apron pair 103 feeds a second roving S12 to the front rollers 101.
- the two apron pairs are arranged in two rows at the rear of the front rollers 101.
- the front rollers 101 include a front bottom roller 101a and front top rollers 101b.
- Each middle apron pair 102 includes a middle bottom apron 104 and a middle top apron 105.
- the middle bottom apron 104 runs around a tensor bar 106, a middle bottom roller 107, and a tensioner 108.
- the middle top apron 105 runs around a middle top roller 109 and a tensioner 111 of an apron cradle 110.
- Each back apron pair 103 includes a back bottom apron 112 and a back top apron 113.
- the back bottom apron 112 runs around the tensor bar 106, a back bottom roller 114, and the tensioner 108.
- the back top apron 113 runs around a back top roller 115 and the tensioner 111 of the apron cradle 110.
- the back top apron 113 which shares the tensioner 111 with the middle top apron 105, runs around the back top roller 115 passing by the circumference of the middle top roller 109.
- the first roving S11 is fed to the middle apron pair 102 and then drafted into a fleece between the front rollers 101 and the middle apron pair 102.
- the second roving S12 is fed to the back apron pair 103 and then drafted into a fleece between the front rollers 101 and the back apron pair 103.
- the fleece is discharged from the front rollers 101 and then twisted into a strand of yarn.
- the second roving S12 fed to the back apron pair 103 is formed by fibers. Some of the fibers are not held by any roller between a position where fibers are held by the front bottom roller 101 a and the front top roller 101 b and a position where fibers are held by the back bottom roller 114 and the back top roller 115. Some of such fibers are tangled with fibers that are held by the front bottom roller 101 a and the front top roller 101 b and pulled by the fibers held by the front bottom roller 101 a and the front top roller 101 b. This may separate fibers from the second roving S12 and break the second roving S12 between the holding position of the front bottom roller 101 a and the front top roller 101b and the holding position of the back bottom roller 114 and the back top roller 115.
- the contact pressure between the back bottom apron 112 and the back top apron 113 may be increased by reducing the clearance between the tensor bar 106 and the tensioner 111 of the apron cradle 110. This limits the separation of fibers from the second roving S12 and the breaking of the second roving S12 between the holding position of the front bottom roller 101a and the front top roller 101b and the holding position of the back bottom roller 114 and the back top roller 115.
- a first aspect of the present invention is a drafting device for a spinning frame that spins a strand of yarn while changing a combination ratio of a first roving and a second roving.
- the drafting device includes front rollers including a front bottom roller and a front top roller, middle rollers including a middle bottom roller and a middle top roller, back rollers including a back bottom roller and a back top roller, a middle apron pair that feeds the first roving to the front rollers, and a back apron pair that feeds the second roving to the front rollers.
- the middle apron pair includes a middle bottom apron that runs around the middle bottom roller and a middle top apron that runs around the middle top roller.
- the middle top apron is driven by the middle bottom roller while pressed by the middle bottom apron.
- the back apron pair includes a back bottom apron that runs around the back bottom roller and a back top apron that runs around the back top roller.
- the back top apron is driven by the back bottom roller while pressed by the back bottom apron.
- the drafting device includes a contact pressure adjustment portion that increases a contact pressure between the back bottom apron and the back top apron in at least a portion of the back apron pair without changing a contact pressure between the middle bottom apron and the middle top apron.
- a drafting device 10 includes front rollers 11, middle rollers 12 located at the rear of the front rollers 11, and back rollers 13 located at the rear of the middle rollers 12.
- the drafting device 10 is of a three-roller configuration.
- the front rollers 11 include a front bottom roller 11 a and front top rollers 11 b.
- Each middle roller 12 includes a middle bottom roller 12a and a middle top roller 12b.
- Each back roller 13 includes a back bottom roller 13a and a back top roller 13b.
- the drafting device 10 includes middle apron pairs 14, which feed a first roving S1 to the front rollers 11, and back apron pairs 15, which feed a second roving S2 to the front rollers 11.
- the drafting device 10 includes apron pairs in two rows so that two kinds of roving are fed to the common front rollers 11.
- the front bottom roller 11a is supported by a roller stand (not shown).
- the front top rollers 11 b are supported by a weighting arm 16, which is located above the middle top rollers 12b and the back top rollers 13b, with a support arm 17.
- the drafting device 10 is of a two-spindle integrated type and includes top rollers such as the front top rollers 11 b at opposite sides of the weighting arm 16.
- Each middle apron pair 14 includes a middle bottom apron 14a and a middle top apron 14b.
- the middle bottom apron 14a runs around the middle bottom roller 12a, a tensor bar 20, and a tensioner 21.
- the tensor bar 20 and the tensioner 21 are located between the front rollers 11 and the middle roller 12.
- the middle top apron 14b runs around the middle top roller 12b and an apron cradle 22, which is located between the front rollers 11 and the middle roller 12.
- the middle top apron 14b is driven by the middle bottom roller 12a while pressed by the middle bottom apron 14a.
- Each back apron pair 15 includes a back bottom apron 15a and a back top apron 15b.
- the back bottom apron 15a runs around the back bottom roller 13a, the tensor bar 20, and the tensioner 21.
- the middle bottom apron 14a and the back bottom apron 15a both run around the tensor bar 20 and the tensioner 21.
- the back bottom apron 15a runs around the back bottom roller 13a passing by the circumference of the middle bottom roller 12a.
- the back top apron 15b runs around the back top roller 13b and the apron cradle 22.
- the middle top apron 14b and the back top apron 15b both run around the apron cradle 22.
- the back top apron 15b runs around the back top roller 13b passing by the circumference of the middle top roller 12b.
- the back top apron 15b is driven by the back bottom roller 13a while pressed by the back bottom apron 15a.
- a support bar 18 extends along the middle rollers 12 and the back rollers 13 between the middle rollers 12 and the back rollers 13.
- Middle trumpet members 30 are coupled to the support bar 18.
- the middle trumpet members 30 are located between the middle rollers 12 and the back rollers 13.
- a support bar 19 is located at the rear of the back rollers 13.
- Back trumpets 19a are coupled to the support bar 19.
- Each back trumpet 19a guides the second roving S2 to the corresponding back apron pair 15.
- the middle trumpet member 30 includes an oblong tetragonal coupling portion 31.
- the coupling portion 31 includes a rear surface 31 a, which is in contact with the support bar 18. When the longitudinal direction of the coupling portion 31 conforms to the longitudinal direction of the support bar 18, the coupling portion 31 is coupled to the support bar 18.
- the coupling portion 31 includes an upper edge that is formed integrally with a tetragonal tubular middle trumpet 32.
- the middle trumpet 32 guides the first roving S1 to the corresponding middle apron pair 14.
- the middle trumpet 32 is located on a first end of the coupling portion 31.
- the middle trumpet 32 includes a feed port 32a, to which the first roving S1 is fed, and a discharge port 32b, which discharges the first roving S1.
- the feed port 32a and the discharge port 32b open in directions orthogonal to each other.
- the upper edge of the coupling portion 31 is formed integrally with a plate-shaped back apron pair guide 33, which guides the back apron pair 15.
- the middle trumpet member 30 includes the middle trumpet 32 and the back apron pair guide 33.
- the back apron pair guide 33 is located on a second end of the coupling portion 31.
- the back apron pair guide 33 includes a flat guide surface 33a opposed to the middle trumpet 32.
- the back apron pair 15 runs between the middle trumpet 32 and the guide surface 33a of the back apron pair guide 33 as guided by the guide surface 33a.
- the support bar 18 is provided with a female-threaded hole 18a.
- the coupling portion 31 is provided with a screw insertion hole 31 h. When a screw 35 is inserted through the screw insertion hole 31 h and fitted into the female-threaded hole 18a, the coupling portion 31 is coupled to the support bar 18.
- the upper edge of the coupling portion 31 includes a portion between the middle trumpet 32 and the back apron pair guide 33 defining a pressing portion 31f.
- the pressing portion 31f presses the back bottom apron 15a to the back top apron 15b.
- the pressing portion 31f is inclined toward a direction in which the back apron pair 15 runs relative to the lateral direction of the coupling portion 31.
- the pressing portion 31f partially increases the contact pressure between the back bottom apron 15a and the back top apron 15b by pressing the back bottom apron 15a and the back top apron 15b.
- the pressing portion 31f functions to increase the contact pressure between the back bottom apron 15a and the back top apron 15b in at least a portion of the back apron pair 15 without changing the contact pressure between the middle bottom apron 14a and the middle top apron 14b.
- the pressing portion 31f which functions as a contact pressure adjustment portion, is located between the middle roller 12 and the back roller 13.
- the first roving S1 is fed from a first roving winding, which is suspended from a creel (not shown), through the middle trumpet 32 and to the middle apron pair 14.
- the second roving S2 is fed from a second roving winding, which is suspended from a creel (not shown), through the back trumpet 19a and to the back apron pair 15.
- the first roving S1 is fed to the middle apron pair 14 and drafted into a fleece between the front rollers 11 and the middle apron pair 14. Subsequently, the fleece formed from the first roving S1 is guided to a snail wire (not shown) and a traveler (not shown) and wound around a bobbin.
- the second roving S2 is fed to the back apron pair 15 and drafted into a fleece between the front rollers 11 and the back apron pair 15. Subsequently, the fleece formed from the second roving S2 is guided to the snail wire (not shown) and the traveler (not shown) and wound around the bobbin.
- the three bottom rollers namely, the front bottom roller 11 a, the middle bottom roller 12a, and the back bottom roller 13a are all driven.
- the first roving S1 is fed from the middle trumpet 32 and drafted into a first fleece between the front rollers 11 and the middle apron pair 14.
- the second roving S2 is fed from the back trumpet 19a and drafted into a second fleece between the front rollers 11 and the back apron pair 15.
- the first fleece and the second fleece are fed from the front rollers 11 and then twisted into a strand of yarn.
- a spinning condition may change from a state in which the first roving S1 and the second roving S2 are simultaneously fed to a state in which only one of the first roving S1 and the second roving S2 is fed.
- the apron pair corresponding to the roving is deactivated.
- the middle bottom roller 12a is deactivated.
- the deactivation of the middle bottom roller 12a deactivates the middle bottom apron 14a.
- the middle top apron 14b is also deactivated. This deactivates the middle apron pair 14.
- the middle apron pair 14 When the middle apron pair 14 is deactivated, the first roving S1 is broken between the middle apron pair 14 and the front rollers 11 during spinning. When starting to feed the first roving S1 again, the middle bottom roller 12a is activated. This activates the middle apron pair 14. Thus, the first roving S1 is smoothly drafted between the front rollers 11 and the middle apron pair 14.
- the back bottom roller 13a When stopping the feeding of the second roving S2, the back bottom roller 13a is deactivated. The deactivation of the back bottom roller 13a deactivates the back bottom apron 15a. At the same time, the back top apron 15b is deactivated. This deactivates the back apron pair 15.
- the back apron pair 15 When the back apron pair 15 is deactivated, the second roving S2 is broken between the back apron pair 15 and the front rollers 11 during spinning.
- the back bottom roller 13a When starting to feed the second roving S2 again, the back bottom roller 13a is activated. This activates the back apron pair 15.
- the second roving S2 is smoothly drafted between the front rollers 11 and the back apron pair 15.
- the combination ratio of the first roving S1 and the second roving S2, which form two kinds of rovings, is changed by controlling the activation and deactivation of the middle apron pair 14 and the back apron pair 15. This continuously spins a strand of target yarn.
- the activation and deactivation of the middle apron pair 14 and the back apron pair 15 are controlled so that one of the first roving S1 and the second roving S2 is continuously fed while the other roving is intermittently fed.
- the activation and deactivation of the middle apron pair 14 and the back apron pair 15 are controlled so that the first roving S1 and the second roving S2 are alternately fed.
- the slub yarn may be set to have any thickness, any length, any interval, and any color combination ratio.
- Some of fibers forming the second roving S2, which is fed to the back apron pair 15, are not held by any roller between the holding position of the front bottom roller 11 a and the front top roller 11 b and the holding position of the back bottom roller 13a and the back top roller 13b. Some of such fibers are tangled with fibers that are held by the front bottom roller 11 a and the front top roller 11 b and pulled by the fibers held by the front bottom roller 11 a and the front top roller 11 b. This may separate fibers from the second roving S2 and break the second roving S2 between the holding position of the front bottom roller 11 a and the front top roller 11 b and the holding position of the back bottom roller 13a and the back top roller 13b.
- the pressing portion 31f increases the contact pressure between the back bottom apron 15a and the back top apron 15b in at least a portion of the back apron pair 15 by pressing the back bottom apron 15a to the back top apron 15b.
- the present embodiment has the advantages described below.
- a pressing member 41 that includes a pressing portion 41f may be separated from the middle trumpet member 30.
- the pressing member 41 is an oblong tetragonal plate.
- the pressing member 41 is provided with an oblong hole defining a screw insertion hole 41 h.
- the screw insertion hole 41 h extends in the longitudinal direction of the pressing member 41.
- the pressing member 41 includes an upper end that upwardly projects beyond a portion of the upper edge of the coupling portion 31 located between the middle trumpet 32 and the back apron pair guide 33. Additionally, the upper end of the pressing member 41 defines the pressing portion 41f, which presses the back bottom apron 15a to the back top apron 15b.
- the pressing portion 41f presses the back bottom apron 15a to the back top apron 15b
- the contact pressure between the back bottom apron 15a and the back top apron 15b is increased in at least a portion of the back apron pair 15 without changing the contact pressure between the middle bottom apron 14a and the middle top apron 14b.
- the pressing member41 is attached to the middle trumpet member 30 in a removable manner.
- the contact pressure between the back bottom apron 15a and the back top apron 15b may be adjusted.
- the screw insertion hole 41 h is an oblong hole.
- a projection amount of the pressing member 41 from the upper edge of the coupling portion 31 may be adjusted by adjusting the position of the screw 35 relative to the screw insertion hole 41 h. Consequently, the contact pressure between the back bottom apron 15a and the back top apron 15b may be easily adjusted.
- the tensor bar 20, around which the middle bottom apron 14a and the back bottom apron 15a both run may include a pressing portion 51f.
- the pressing portion 51f is located on a surface of the tensor bar 20 where the back bottom apron 15a runs.
- the surface of the tensor bar 20 where the back bottom apron 15a runs, that is, the pressing portion 51f, is located above a surface of the tensor bar 20 where the middle bottom apron 14a runs.
- the back bottom apron 15a runs on a position proximate to the back top apron 15b compared to when the pressing portion 51f and the surface of the tensor bar 20 where the middle bottom apron 14a runs are located at the same height.
- the back bottom apron 15a is pressed to the back top apron 15b by the pressing portion 51f.
- a member that supports the pressing portion 51f does not need to be separately arranged between the front rollers 11 and the middle roller 12. This simplifies the entire structure of the device.
- a pressing member 61 that includes a pressing portion 61f may be coupled to the tensor bar 20. More specifically, the pressing portion 61f and the tensor bar 20 may be separate members.
- a pressing member 71 may be located on a circumferential surface of each middle top roller 12b at a position overlapped with the back top apron 15b.
- the pressing member 71 which is tubular, is coupled to a circumferential surface of the middle top roller 12b and rotationally supported by the middle top roller 12b.
- the pressing member 71 increases the contact pressure between the back bottom apron 15a and the back top apron 15b without allowing the back bottom apron 15a to contact the middle bottom roller 12a.
- a portion of the middle top roller 12b that is overlapped with the back top apron 15b has a smaller outer diameter than a portion of the middle top roller 12b that is overlapped with the middle top apron 14b.
- the pressing member 71 has a smaller outer diameter than the portion of the middle top roller 12b that is overlapped with the middle top apron 14b.
- the back top apron 15b is not in contact with the middle top roller 12b.
- the back bottom apron 15a is not in contact with the middle bottom roller 12a.
- the pressing member 71 is coupled to the middle top roller 12b, the pressing member 71 is in contact with the back top apron 15b and presses the back top apron 15b to the back bottom apron 15a. This increases the contact pressure between the back bottom apron 15a and the back top apron 15b in at least a portion of the back apron pair 15.
- the pressing member 71 is rotational relative to the middle top roller 12b. This reduces friction between the pressing member 71 and the back top apron 15b.
- the pressing member 71 which functions as a contact pressure adjustment portion, may be arranged on the middle top roller 12b, which is a conventional member.
- the pressing member 71 may be arranged on the middle top roller 12b so that the pressing member 71 rotates integrally with the middle top roller 12b instead of rotating relative to the middle top roller 12b.
- a pressing member 81 may be located between each middle top roller 12b and the corresponding back top roller 13b.
- the pressing member 81 includes a pressing portion 81f that presses the back top apron 15b to the back bottom apron 15a.
- the pressing member 81 includes the pressing portion 81f and a support portion 81 a that is continuous with the pressing portion 81f and supported by the middle top roller 12b.
- the pressing portion 81f and the support portion 81a are rod-shaped.
- the support portion 81 a may pivot about the rotation axis of the middle top roller 12b.
- the pressing portion 81f presses the back top apron 15b to the back bottom apron 15a. This increases the contact pressure between the back bottom apron 15a and the back top apron 15b in at least a portion of the back apron pair 15.
- the upper end of the pressing member 41 may include a rotation member 41 a.
- the rotation member 41 a may rotate while contacting the back bottom apron 15a.
- the rotation member 41 a presses the back bottom apron 15a to the back top apron 15b.
- the rotation member 41 a functions as a contact pressure adjustment portion that increases the contact pressure between the back bottom apron 15a and the back top apron 15b in at least a portion of the back apron pair 15.
- the rotation member 41 a rotates while contacting the back bottom apron 15a. This allows the back apron pair 15 to smoothly run.
- a rotation member 41 b may be located opposing the rotation member 41 a.
- the rotation member 41 b is supported by the weighting arm 16 so that the rotation member 41 b may rotate while contacting the back top apron 15b.
- the rotation member 41 b presses the back top apron 15b to the back bottom apron 15a.
- the back apron pair 15 is held between the two rotation members 41 a, 41 b. This increases the contact pressure between the back bottom apron 15a and the back top apron 15b.
- the two rotation members 41 a, 41 b function as contact pressure adjustment portions that increase the contact pressure between the back bottom apron 15a and the back top apron 15b in at least a portion of the back apron pair 15. This limits bends of the running path of the back apron pair 15 and allows the back apron pair 15 to smoothly run.
- the pressing portion 31f may extend in the lateral direction of the coupling portion 31.
- the pressing portion 31f may be inclined toward a side opposite to the running direction of the back apron pair 15 relative to the lateral direction of the coupling portion 31.
- the middle trumpet member 30 does not have to include the middle trumpet 32 and the back apron pair guide 33.
- the middle trumpet member 30 only needs to include the middle trumpet 32.
- the middle trumpet member 30 only needs to at least guide the first roving S1 to the middle apron pair 14.
- the drafting device is not limited to the three-roller configuration and may be of a four-roller configuration.
- a second back roller may be arranged at the rear of the back apron pair 15.
- the first roving S1 and the second roving S2 may be drafted between the middle apron pair 14 and the second back roller and between the back apron pair 15 and the second back roller.
- slivers may be supplied to the drafting device 10 to spin yarn.
- the spinning frame may be a roving frame.
- a drafting device includes a pressing portion that increases the contact pressure between a back bottom apron and a back top apron without changing the contact pressure between a middle bottom apron and a middle top apron. This does not hinder feeding of fibers of a first roving that are held by a front bottom roller and a front top roller. Additionally, separation of fibers from a second roving and breaking of the second roving may be limited between the holding position of the front bottom roller and the front top roller and the holding position of the back bottom roller and the back top roller.
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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 drafting device for a spinning frame that spins a strand of yarn while changing the combination ratio of a first roving and a second roving.
- For example, International Publication No.
WO2015/033811 discloses such type of drafting device. As shown inFigs. 16 and 17 , adrafting device 100 includesfront rollers 101,middle apron pairs 102, and backapron pairs 103. Themiddle apron pairs 102 and theback apron pairs 103 are located at the rear of thefront rollers 101. Eachmiddle apron pair 102 feeds a first roving S11 to thefront rollers 101. Eachback apron pair 103 feeds a second roving S12 to thefront rollers 101. The two apron pairs are arranged in two rows at the rear of thefront rollers 101. - The
front rollers 101 include afront bottom roller 101a andfront top rollers 101b. Eachmiddle apron pair 102 includes amiddle bottom apron 104 and amiddle top apron 105. The middle bottom apron 104 runs around atensor bar 106, amiddle bottom roller 107, and atensioner 108. Themiddle top apron 105 runs around amiddle top roller 109 and atensioner 111 of an apron cradle 110. - Each
back apron pair 103 includes aback bottom apron 112 and aback top apron 113. The back bottom apron 112 runs around thetensor bar 106, aback bottom roller 114, and thetensioner 108. The back bottom apron 112, which shares thetensor bar 106 and thetensioner 108 with themiddle bottom apron 104, runs around theback bottom roller 114 passing by the circumference of themiddle bottom roller 107. - The
back top apron 113 runs around aback top roller 115 and thetensioner 111 of the apron cradle 110. Theback top apron 113, which shares thetensioner 111 with themiddle top apron 105, runs around the backtop roller 115 passing by the circumference of the middletop roller 109. - The first roving S11 is fed to the
middle apron pair 102 and then drafted into a fleece between thefront rollers 101 and themiddle apron pair 102. The second roving S12 is fed to theback apron pair 103 and then drafted into a fleece between thefront rollers 101 and theback apron pair 103. The fleece is discharged from thefront rollers 101 and then twisted into a strand of yarn. - The second roving S12 fed to the
back apron pair 103 is formed by fibers. Some of the fibers are not held by any roller between a position where fibers are held by thefront bottom roller 101 a and thefront top roller 101 b and a position where fibers are held by theback bottom roller 114 and theback top roller 115. Some of such fibers are tangled with fibers that are held by thefront bottom roller 101 a and thefront top roller 101 b and pulled by the fibers held by thefront bottom roller 101 a and thefront top roller 101 b. This may separate fibers from the second roving S12 and break the second roving S12 between the holding position of thefront bottom roller 101 a and thefront top roller 101b and the holding position of theback bottom roller 114 and theback top roller 115. - In this regard, the contact pressure between the
back bottom apron 112 and theback top apron 113 may be increased by reducing the clearance between thetensor bar 106 and thetensioner 111 of the apron cradle 110. This limits the separation of fibers from the second roving S12 and the breaking of the second roving S12 between the holding position of thefront bottom roller 101a and thefront top roller 101b and the holding position of theback bottom roller 114 and theback top roller 115. - However, when the clearance is reduced between
tensor bar 106 and thetensioner 111 of the apron cradle 110, the contact pressure between themiddle bottom apron 104 and themiddle top apron 105 is also increased. This hinders the feeding of fibers that form the first roving S11, which is fed to themiddle apron pair 102, and are held by thefront bottom roller 101 a and the fronttop roller 101 b. Thus, the drafting of the first roving S11 is hindered between thefront rollers 101 and themiddle apron pair 102. - It is an object of the present invention to provide a drafting device for a spinning frame that limits breaking of a second roving fed to a back apron pair while facilitating drafting of a first roving fed to a middle apron pair.
- To solve the above problem, a first aspect of the present invention is a drafting device for a spinning frame that spins a strand of yarn while changing a combination ratio of a first roving and a second roving. The drafting device includes front rollers including a front bottom roller and a front top roller, middle rollers including a middle bottom roller and a middle top roller, back rollers including a back bottom roller and a back top roller, a middle apron pair that feeds the first roving to the front rollers, and a back apron pair that feeds the second roving to the front rollers. The middle apron pair includes a middle bottom apron that runs around the middle bottom roller and a middle top apron that runs around the middle top roller. The middle top apron is driven by the middle bottom roller while pressed by the middle bottom apron. The back apron pair includes a back bottom apron that runs around the back bottom roller and a back top apron that runs around the back top roller. The back top apron is driven by the back bottom roller while pressed by the back bottom apron. The drafting device includes a contact pressure adjustment portion that increases a contact pressure between the back bottom apron and the back top apron in at least a portion of the back apron pair without changing a contact pressure between the middle bottom apron and the middle top apron.
- Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
- The invention, together with objects and advantages thereof, may best be understood by reference to the following description of the presently preferred embodiments together with the accompanying drawings in which:
-
Fig. 1 is a schematic perspective view showing one embodiment of a drafting device according to the present invention; -
Fig. 2 is a schematic cross-sectional view of the drafting device; -
Fig. 3 is a schematic perspective view of a middle trumpet member; -
Fig. 4 is a cross-sectional view of the middle trumpet member; -
Fig. 5A is an exploded perspective view showing a modified example of a middle trumpet member and a pressing member; -
Fig. 5B is a schematic perspective view of the middle trumpet member; -
Fig. 6 is a cross-sectional view of the middle trumpet member; -
Fig. 7 is a schematic perspective view showing a modified example of a tensor bar; -
Fig. 8 is a side view of the tensor bar; -
Fig. 9 is a schematic perspective view showing a modified example of a tensor bar; -
Fig. 10 is a schematic perspective view showing a modified example of a middle top roller; -
Fig. 11A is a schematic diagram showing a state when a pressing member is not coupled to the middle top roller; -
Fig. 11B is a schematic diagram showing a state when the pressing member is coupled to the middle top roller; -
Fig. 12 is a schematic perspective view showing a portion of a modified example of a drafting device; -
Fig. 13 is a cross-sectional view showing a modified example of a middle trumpet member; -
Fig. 14 is a cross-sectional view showing a modified example of a middle trumpet member; -
Fig. 15A and 15B are cross-sectional views showing modified examples of a middle trumpet member; -
Fig. 16 is a schematic perspective view of a prior art drafting device; and -
Fig. 17 is a schematic cross-sectional view of the prior art drafting device. - One embodiment of a drafting device for a spinning frame will now be described with reference to
Figs. 1 to 4 . - Referring to
Figs. 1 and 2 , adrafting device 10 includesfront rollers 11,middle rollers 12 located at the rear of thefront rollers 11, and backrollers 13 located at the rear of themiddle rollers 12. The draftingdevice 10 is of a three-roller configuration. Thefront rollers 11 include a front bottom roller 11 a and front top rollers 11 b. Eachmiddle roller 12 includes amiddle bottom roller 12a and a middletop roller 12b. Eachback roller 13 includes a backbottom roller 13a and a backtop roller 13b. The draftingdevice 10 includes middle apron pairs 14, which feed a first roving S1 to thefront rollers 11, and back apron pairs 15, which feed a second roving S2 to thefront rollers 11. The draftingdevice 10 includes apron pairs in two rows so that two kinds of roving are fed to thecommon front rollers 11. - The front bottom roller 11a is supported by a roller stand (not shown). The front top rollers 11 b are supported by a
weighting arm 16, which is located above the middletop rollers 12b and the backtop rollers 13b, with asupport arm 17. The draftingdevice 10 is of a two-spindle integrated type and includes top rollers such as the front top rollers 11 b at opposite sides of theweighting arm 16. - Each
middle apron pair 14 includes amiddle bottom apron 14a and a middletop apron 14b. Themiddle bottom apron 14a runs around themiddle bottom roller 12a, atensor bar 20, and atensioner 21. Thetensor bar 20 and thetensioner 21 are located between thefront rollers 11 and themiddle roller 12. The middletop apron 14b runs around the middletop roller 12b and anapron cradle 22, which is located between thefront rollers 11 and themiddle roller 12. The middletop apron 14b is driven by themiddle bottom roller 12a while pressed by themiddle bottom apron 14a. - Each
back apron pair 15 includes a backbottom apron 15a and a backtop apron 15b. The backbottom apron 15a runs around the backbottom roller 13a, thetensor bar 20, and thetensioner 21. Thus, themiddle bottom apron 14a and the backbottom apron 15a both run around thetensor bar 20 and thetensioner 21. The backbottom apron 15a runs around the backbottom roller 13a passing by the circumference of themiddle bottom roller 12a. - The back
top apron 15b runs around the backtop roller 13b and theapron cradle 22. Thus, the middletop apron 14b and the backtop apron 15b both run around theapron cradle 22. The backtop apron 15b runs around the backtop roller 13b passing by the circumference of the middletop roller 12b. The backtop apron 15b is driven by the backbottom roller 13a while pressed by the backbottom apron 15a. - A
support bar 18 extends along themiddle rollers 12 and theback rollers 13 between themiddle rollers 12 and theback rollers 13.Middle trumpet members 30 are coupled to thesupport bar 18. Thus, themiddle trumpet members 30 are located between themiddle rollers 12 and theback rollers 13. Additionally, asupport bar 19 is located at the rear of theback rollers 13. Back trumpets 19a are coupled to thesupport bar 19. Eachback trumpet 19a guides the second roving S2 to the corresponding backapron pair 15. - As shown in
Fig. 3 , themiddle trumpet member 30 includes an oblongtetragonal coupling portion 31. Thecoupling portion 31 includes arear surface 31 a, which is in contact with thesupport bar 18. When the longitudinal direction of thecoupling portion 31 conforms to the longitudinal direction of thesupport bar 18, thecoupling portion 31 is coupled to thesupport bar 18. - The
coupling portion 31 includes an upper edge that is formed integrally with a tetragonal tubularmiddle trumpet 32. Themiddle trumpet 32 guides the first roving S1 to the correspondingmiddle apron pair 14. Themiddle trumpet 32 is located on a first end of thecoupling portion 31. Themiddle trumpet 32 includes afeed port 32a, to which the first roving S1 is fed, and adischarge port 32b, which discharges the first roving S1. Thefeed port 32a and thedischarge port 32b open in directions orthogonal to each other. - Additionally, the upper edge of the
coupling portion 31 is formed integrally with a plate-shaped backapron pair guide 33, which guides theback apron pair 15. Thus, themiddle trumpet member 30 includes themiddle trumpet 32 and the backapron pair guide 33. The back apron pair guide 33 is located on a second end of thecoupling portion 31. The back apron pair guide 33 includes a flat guide surface 33a opposed to themiddle trumpet 32. Theback apron pair 15 runs between themiddle trumpet 32 and the guide surface 33a of the back apron pair guide 33 as guided by the guide surface 33a. - As shown in
Fig. 4 , thesupport bar 18 is provided with a female-threadedhole 18a. Thecoupling portion 31 is provided with ascrew insertion hole 31 h. When ascrew 35 is inserted through thescrew insertion hole 31 h and fitted into the female-threadedhole 18a, thecoupling portion 31 is coupled to thesupport bar 18. - The upper edge of the
coupling portion 31 includes a portion between themiddle trumpet 32 and the back apron pair guide 33 defining apressing portion 31f. Thepressing portion 31f presses the backbottom apron 15a to the backtop apron 15b. As indicated by arrow X1 inFig. 4 , thepressing portion 31f is inclined toward a direction in which theback apron pair 15 runs relative to the lateral direction of thecoupling portion 31. Thepressing portion 31f partially increases the contact pressure between the backbottom apron 15a and the backtop apron 15b by pressing the backbottom apron 15a and the backtop apron 15b. However, the contact pressure between themiddle bottom apron 14a and the middletop apron 14b does not change. Thus, thepressing portion 31f functions to increase the contact pressure between the backbottom apron 15a and the backtop apron 15b in at least a portion of theback apron pair 15 without changing the contact pressure between themiddle bottom apron 14a and the middletop apron 14b. Thepressing portion 31f, which functions as a contact pressure adjustment portion, is located between themiddle roller 12 and theback roller 13. - Referring to
Fig. 1 , the first roving S1 is fed from a first roving winding, which is suspended from a creel (not shown), through themiddle trumpet 32 and to themiddle apron pair 14. Also, the second roving S2 is fed from a second roving winding, which is suspended from a creel (not shown), through theback trumpet 19a and to theback apron pair 15. - The first roving S1 is fed to the
middle apron pair 14 and drafted into a fleece between thefront rollers 11 and themiddle apron pair 14. Subsequently, the fleece formed from the first roving S1 is guided to a snail wire (not shown) and a traveler (not shown) and wound around a bobbin. The second roving S2 is fed to theback apron pair 15 and drafted into a fleece between thefront rollers 11 and theback apron pair 15. Subsequently, the fleece formed from the second roving S2 is guided to the snail wire (not shown) and the traveler (not shown) and wound around the bobbin. - When the first roving S1 and the second roving S2 are simultaneously fed, the three bottom rollers, namely, the front bottom roller 11 a, the
middle bottom roller 12a, and the backbottom roller 13a are all driven. The first roving S1 is fed from themiddle trumpet 32 and drafted into a first fleece between thefront rollers 11 and themiddle apron pair 14. The second roving S2 is fed from theback trumpet 19a and drafted into a second fleece between thefront rollers 11 and theback apron pair 15. The first fleece and the second fleece are fed from thefront rollers 11 and then twisted into a strand of yarn. - A spinning condition may change from a state in which the first roving S1 and the second roving S2 are simultaneously fed to a state in which only one of the first roving S1 and the second roving S2 is fed. In such a case, when stopping the feeding of a roving, the apron pair corresponding to the roving is deactivated. For example, when stopping the feeding of the first roving S1, the
middle bottom roller 12a is deactivated. The deactivation of themiddle bottom roller 12a deactivates themiddle bottom apron 14a. At the same time, the middletop apron 14b is also deactivated. This deactivates themiddle apron pair 14. When themiddle apron pair 14 is deactivated, the first roving S1 is broken between themiddle apron pair 14 and thefront rollers 11 during spinning. When starting to feed the first roving S1 again, themiddle bottom roller 12a is activated. This activates themiddle apron pair 14. Thus, the first roving S1 is smoothly drafted between thefront rollers 11 and themiddle apron pair 14. - When stopping the feeding of the second roving S2, the back
bottom roller 13a is deactivated. The deactivation of the backbottom roller 13a deactivates the backbottom apron 15a. At the same time, the backtop apron 15b is deactivated. This deactivates theback apron pair 15. When theback apron pair 15 is deactivated, the second roving S2 is broken between theback apron pair 15 and thefront rollers 11 during spinning. When starting to feed the second roving S2 again, the backbottom roller 13a is activated. This activates theback apron pair 15. Thus, the second roving S2 is smoothly drafted between thefront rollers 11 and theback apron pair 15. - During spinning, the combination ratio of the first roving S1 and the second roving S2, which form two kinds of rovings, is changed by controlling the activation and deactivation of the
middle apron pair 14 and theback apron pair 15. This continuously spins a strand of target yarn. - In one example, when spinning slub yarn, the activation and deactivation of the
middle apron pair 14 and theback apron pair 15 are controlled so that one of the first roving S1 and the second roving S2 is continuously fed while the other roving is intermittently fed. In one example, when the first roving S1 and the second roving S2 have different colors, the activation and deactivation of themiddle apron pair 14 and theback apron pair 15 are controlled so that the first roving S1 and the second roving S2 are alternately fed. This spins yarn in which portions having different colors continuously alternate. The slub yarn may be set to have any thickness, any length, any interval, and any color combination ratio. When themiddle bottom roller 12a and the backbottom roller 13a are activated in accordance with the above setting, desired yarn may be spun. - The operation of the present embodiment will now be described.
- Some of fibers forming the second roving S2, which is fed to the
back apron pair 15, are not held by any roller between the holding position of the front bottom roller 11 a and the front top roller 11 b and the holding position of the backbottom roller 13a and the backtop roller 13b. Some of such fibers are tangled with fibers that are held by the front bottom roller 11 a and the front top roller 11 b and pulled by the fibers held by the front bottom roller 11 a and the front top roller 11 b. This may separate fibers from the second roving S2 and break the second roving S2 between the holding position of the front bottom roller 11 a and the front top roller 11 b and the holding position of the backbottom roller 13a and the backtop roller 13b. - In this regard, in the present embodiment, the
pressing portion 31f increases the contact pressure between the backbottom apron 15a and the backtop apron 15b in at least a portion of theback apron pair 15 by pressing the backbottom apron 15a to the backtop apron 15b. This limits the separation of fibers from the second roving S2 and the breaking of the second roving S2 between the holding position of the front bottom roller 11 a and the front top roller 11 b and the holding position of the backbottom roller 13a and the backtop roller 13b. - The present embodiment has the advantages described below.
- (1) The
drafting device 10 includes thepressing portions 31f. Eachpressing portion 31f functions as a contact pressure adjustment portion that increases the contact pressure between the backbottom apron 15a and the backtop apron 15b in at least a portion of theback apron pair 15 without changing the contact pressure between themiddle bottom apron 14a and the middletop apron 14b. In this configuration, the contact pressure between themiddle bottom apron 14a and the middletop apron 14b will not be increased in accordance with the contact pressure between the backbottom apron 15a and the backtop apron 15b. Thus, the contact pressure between themiddle bottom apron 14a and the middletop apron 14b does not increase. This does not hinder the feeding of the fibers of the first roving S1 that are held by the front bottom roller 11 a and the front top roller 11 b. Additionally, as compared to a configuration that does not include thepressing portions 31f, the separation of fibers from the second roving S2 and the breaking of the second roving S2 are limited between the holding position of the front bottom roller 11 a and the front top roller 11 b and the holding position of the backbottom roller 13a and the backtop roller 13b. Therefore, the breaking of the second roving S2, which is fed to theback apron pair 15, is controlled while facilitating the drafting of the first roving S1, which is fed to themiddle apron pair 14. - (2) The
pressing portion 31f is located between themiddle roller 12 and theback roller 13. Thus, the position where thepressing portion 31f increases the contact pressure between the backbottom apron 15a and the backtop apron 15b may be separated from thefront rollers 11 more than when thepressing portion 31f is located between thefront rollers 11 and themiddle roller 12. This prevents a situation in which the feeding of the second roving S2 held by the front bottom roller 11 a and the front top roller 11 b is hindered due to the contact pressure between the backbottom apron 15a and the backtop apron 15b that is increased by thepressing portion 31f. - (3) The
pressing portion 31f is arranged on themiddle trumpet member 30. Themiddle trumpet member 30 is located between themiddle roller 12 and theback roller 13. Thus, a support member for arranging thepressing portion 31f on themiddle trumpet member 30 does not need to be separately arranged between themiddle roller 12 and theback roller 13. This simplifies the entire structure of the device. - (4) When the
pressing portion 31f and themiddle trumpet member 30 are separate members, a task for coupling thepressing portion 31f to themiddle trumpet member 30 is necessary. In this regard, in the present embodiment, thepressing portion 31f is formed integrally with themiddle trumpet member 30. This configuration eliminates the need of the task for coupling thepressing portion 31f to themiddle trumpet member 30. Thus, the coupling efficiency is improved. Also, the number of components is reduced. - (5) The
pressing portion 31f is inclined toward the running direction of theback apron pair 15 relative to the lateral direction of thecoupling portion 31. This allows theback apron pair 15 to be smoothly run compared to when thepressing portion 31f is inclined toward a side opposite to the running direction of theback apron pair 15 relative to the lateral direction of thecoupling portion 31. - It should be apparent to those skilled in the art that the present invention may be embodied in many other specific forms without departing from the scope of the invention. Particularly, it should be understood that the present invention may be embodied in the following forms.
- As shown in
Figs. 5A and 5B , a pressingmember 41 that includes apressing portion 41f may be separated from themiddle trumpet member 30. The pressingmember 41 is an oblong tetragonal plate. When the longitudinal direction of the pressingmember 41 conforms to the lateral direction of thecoupling portion 31, the pressingmember 41 is located between themiddle trumpet 32 and the backapron pair guide 33. The pressingmember 41 is provided with an oblong hole defining ascrew insertion hole 41 h. Thescrew insertion hole 41 h extends in the longitudinal direction of the pressingmember 41. When ascrew 35 is inserted through thescrew insertion hole 41 h and thescrew insertion hole 31 h and fitted into the female-threadedhole 18a, the pressingmember 41 and thecoupling portion 31 are coupled to thesupport bar 18. - As shown in
Fig. 6 , the pressingmember 41 includes an upper end that upwardly projects beyond a portion of the upper edge of thecoupling portion 31 located between themiddle trumpet 32 and the backapron pair guide 33. Additionally, the upper end of the pressingmember 41 defines thepressing portion 41f, which presses the backbottom apron 15a to the backtop apron 15b. When thepressing portion 41f presses the backbottom apron 15a to the backtop apron 15b, the contact pressure between the backbottom apron 15a and the backtop apron 15b is increased in at least a portion of theback apron pair 15 without changing the contact pressure between themiddle bottom apron 14a and the middletop apron 14b. - In the above configuration, the pressing member41 is attached to the
middle trumpet member 30 in a removable manner. Thus, the contact pressure between the backbottom apron 15a and the backtop apron 15b may be adjusted. This further limits the breaking of the second roving S2, which is fed to theback apron pair 15. Additionally, thescrew insertion hole 41 h is an oblong hole. Thus, a projection amount of the pressingmember 41 from the upper edge of thecoupling portion 31 may be adjusted by adjusting the position of thescrew 35 relative to thescrew insertion hole 41 h. Consequently, the contact pressure between the backbottom apron 15a and the backtop apron 15b may be easily adjusted. - As shown in
Figs. 7 and 8 , thetensor bar 20, around which themiddle bottom apron 14a and the backbottom apron 15a both run, may include apressing portion 51f. Thepressing portion 51f is located on a surface of thetensor bar 20 where the backbottom apron 15a runs. The surface of thetensor bar 20 where the backbottom apron 15a runs, that is, thepressing portion 51f, is located above a surface of thetensor bar 20 where themiddle bottom apron 14a runs. In this case, the backbottom apron 15a runs on a position proximate to the backtop apron 15b compared to when thepressing portion 51f and the surface of thetensor bar 20 where themiddle bottom apron 14a runs are located at the same height. Thus, the backbottom apron 15a is pressed to the backtop apron 15b by thepressing portion 51f. In this configuration, thetensor bar 20, which is a conventional member located between thefront rollers 11 and themiddle roller 12, includes thepressing portion 51f. Thus, a member that supports thepressing portion 51f does not need to be separately arranged between thefront rollers 11 and themiddle roller 12. This simplifies the entire structure of the device. - As shown in
Fig. 9 , a pressing member 61 that includes apressing portion 61f may be coupled to thetensor bar 20. More specifically, thepressing portion 61f and thetensor bar 20 may be separate members. - As shown in
Fig. 10 , a pressingmember 71 may be located on a circumferential surface of each middletop roller 12b at a position overlapped with the backtop apron 15b. The pressingmember 71, which is tubular, is coupled to a circumferential surface of the middletop roller 12b and rotationally supported by the middletop roller 12b. The pressingmember 71 increases the contact pressure between the backbottom apron 15a and the backtop apron 15b without allowing the backbottom apron 15a to contact themiddle bottom roller 12a. A portion of the middletop roller 12b that is overlapped with the backtop apron 15b has a smaller outer diameter than a portion of the middletop roller 12b that is overlapped with the middletop apron 14b. The pressingmember 71 has a smaller outer diameter than the portion of the middletop roller 12b that is overlapped with the middletop apron 14b. - As shown in
Fig. 11A , when the pressingmember 71 is not coupled to the middletop roller 12b, the backtop apron 15b is not in contact with the middletop roller 12b. Also, the backbottom apron 15a is not in contact with themiddle bottom roller 12a. As shown inFig. 11B , when the pressingmember 71 is coupled to the middletop roller 12b, the pressingmember 71 is in contact with the backtop apron 15b and presses the backtop apron 15b to the backbottom apron 15a. This increases the contact pressure between the backbottom apron 15a and the backtop apron 15b in at least a portion of theback apron pair 15. Even in this state, the backbottom apron 15a is not in contact with themiddle bottom roller 12a. Additionally, the pressingmember 71 is rotational relative to the middletop roller 12b. This reduces friction between the pressingmember 71 and the backtop apron 15b. The pressingmember 71, which functions as a contact pressure adjustment portion, may be arranged on the middletop roller 12b, which is a conventional member. The pressingmember 71 may be arranged on the middletop roller 12b so that the pressingmember 71 rotates integrally with the middletop roller 12b instead of rotating relative to the middletop roller 12b. - As shown in
Fig. 12 , a pressingmember 81 may be located between each middletop roller 12b and the corresponding backtop roller 13b. The pressingmember 81 includes apressing portion 81f that presses the backtop apron 15b to the backbottom apron 15a. The pressingmember 81 includes thepressing portion 81f and a support portion 81 a that is continuous with thepressing portion 81f and supported by the middletop roller 12b. Thepressing portion 81f and the support portion 81a are rod-shaped. The support portion 81 a may pivot about the rotation axis of the middletop roller 12b. When the support portion 81a pivots about the rotation axis of the middletop roller 12b toward the backbottom apron 15a, thepressing portion 81f presses the backtop apron 15b to the backbottom apron 15a. This increases the contact pressure between the backbottom apron 15a and the backtop apron 15b in at least a portion of theback apron pair 15. - As shown in
Fig. 13 , the upper end of the pressingmember 41 may include a rotation member 41 a. The rotation member 41 a may rotate while contacting the backbottom apron 15a. The rotation member 41 a presses the backbottom apron 15a to the backtop apron 15b. Thus, the rotation member 41 a functions as a contact pressure adjustment portion that increases the contact pressure between the backbottom apron 15a and the backtop apron 15b in at least a portion of theback apron pair 15. In this case, the rotation member 41 a rotates while contacting the backbottom apron 15a. This allows theback apron pair 15 to smoothly run. - As shown in
Fig. 14 , in the embodiment shown inFig. 13 , arotation member 41 b may be located opposing the rotation member 41 a. Therotation member 41 b is supported by theweighting arm 16 so that therotation member 41 b may rotate while contacting the backtop apron 15b. Therotation member 41 b presses the backtop apron 15b to the backbottom apron 15a. Thus, theback apron pair 15 is held between the tworotation members 41 a, 41 b. This increases the contact pressure between the backbottom apron 15a and the backtop apron 15b. The tworotation members 41 a, 41 b function as contact pressure adjustment portions that increase the contact pressure between the backbottom apron 15a and the backtop apron 15b in at least a portion of theback apron pair 15. This limits bends of the running path of theback apron pair 15 and allows theback apron pair 15 to smoothly run. - As shown in
Fig. 15A , thepressing portion 31f may extend in the lateral direction of thecoupling portion 31. Alternatively, as shown inFig. 15B , thepressing portion 31f may be inclined toward a side opposite to the running direction of theback apron pair 15 relative to the lateral direction of thecoupling portion 31. - The
middle trumpet member 30 does not have to include themiddle trumpet 32 and the backapron pair guide 33. Themiddle trumpet member 30 only needs to include themiddle trumpet 32. Thus, themiddle trumpet member 30 only needs to at least guide the first roving S1 to themiddle apron pair 14. - The drafting device is not limited to the three-roller configuration and may be of a four-roller configuration. For example, a second back roller may be arranged at the rear of the
back apron pair 15. Then, the first roving S1 and the second roving S2 may be drafted between themiddle apron pair 14 and the second back roller and between theback apron pair 15 and the second back roller. In the four-roller configuration, instead of roving, slivers may be supplied to thedrafting device 10 to spin yarn. - The spinning frame may be a roving frame.
- The present examples and embodiments are to be considered as illustrative and not restrictive, and the invention is not to be limited to the details given herein, but may be modified within the scope and equivalence of the appended claims.
- A drafting device includes a pressing portion that increases the contact pressure between a back bottom apron and a back top apron without changing the contact pressure between a middle bottom apron and a middle top apron. This does not hinder feeding of fibers of a first roving that are held by a front bottom roller and a front top roller. Additionally, separation of fibers from a second roving and breaking of the second roving may be limited between the holding position of the front bottom roller and the front top roller and the holding position of the back bottom roller and the back top roller.
Claims (7)
- A drafting device (10) for a spinning frame that spins a strand of yarn while changing a combination ratio of a first roving (S1) and a second roving (S2), wherein the drafting device includes front rollers (11) including a front bottom roller (11 a) and a front top roller (11b), middle rollers (12) including a middle bottom roller (12a) and a middle top roller (12b), back rollers (13) including a back bottom roller (13a) and a back top roller (13b), a middle apron pair (14) that feeds the first roving (S1) to the front rollers (11), and a back apron pair (15) that feeds the second roving (S2) to the front rollers (11), wherein the middle apron pair (14) includes a middle bottom apron (14a) that runs around the middle bottom roller (12a) and a middle top apron (14b) that runs around the middle top roller (12b), the middle top apron (14b) is driven by the middle bottom roller (12a) while pressed by the middle bottom apron (14a), the back apron pair (15) includes a back bottom apron (15a) that runs around the back bottom roller (13a) and a back top apron (15b) that runs around the back top roller (13b), the back top apron (15b) is driven by the back bottom roller (13a) while pressed by the back bottom apron (15a), the drafting device (10) being characterized by:a contact pressure adjustment portion (31f, 41f, 51f, 61f, 81f, 71, 41a, 41b) that increases a contact pressure between the back bottom apron (15a) and the back top apron (15b) in at least a portion of the back apron pair (15) without changing a contact pressure between the middle bottom apron (14a) and the middle top apron (14b).
- The drafting device (10) for a spinning frame according to claim 1, being characterized in that the contact pressure adjustment portion (31f, 41f, 81f, 41a, 41b) is located between the middle roller (12) and the back roller (13).
- The drafting device (10) for a spinning frame according to claim 2, being characterized by a middle trumpet member (30) located between the middle roller (12) and the back roller (13) to guide the first roving (S1) to the middle apron pair (14),
wherein the middle trumpet member (30) includes the contact pressure adjustment portion (31f, 41f, 41a, 41b). - The drafting device (10) for a spinning frame according to claim 3, being characterized in that the contact pressure adjustment portion (31f) is formed integrally with the middle trumpet member (30).
- The drafting device (10) for a spinning frame according to claim 3, being characterized in that the contact pressure adjustment portion (41f, 41a, 41 b) and the middle trumpet member (30) are separate members.
- The drafting device (10) for a spinning frame according to claim 1, being characterized by a tensor bar (20) located between the front roller (11) and the middle roller (12), wherein
the middle bottom apron (14a) and the back bottom apron (15a) both run around the tensor bar (20), and
the contact pressure adjustment portion (51f, 61f) is located on a surface of the tensor bar (20) where the back bottom apron (15a) runs. - The drafting device (10) for a spinning frame according to claim 1, being characterized in that:the back top apron (15b) runs around the back top roller (13b) passing by a circumference of the middle top roller (12b); andthe contact pressure adjustment portion (71) is located on a circumferential surface of the middle top roller (12b) at a position overlapped with the back top apron (15b).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2015149848A JP6358187B2 (en) | 2015-07-29 | 2015-07-29 | Draft device in spinning machine |
Publications (2)
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EP3124658A1 true EP3124658A1 (en) | 2017-02-01 |
EP3124658B1 EP3124658B1 (en) | 2019-03-06 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP16179877.2A Active EP3124658B1 (en) | 2015-07-29 | 2016-07-18 | Drafting device for spinning frame |
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EP (1) | EP3124658B1 (en) |
JP (1) | JP6358187B2 (en) |
CN (1) | CN106400217B (en) |
ES (1) | ES2718243T3 (en) |
TR (1) | TR201906637T4 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108728950A (en) * | 2018-07-31 | 2018-11-02 | 无锡市恒久电器技术有限公司 | A kind of special drawing-off spinning mechanism of spinning frame |
WO2019016414A1 (en) * | 2017-09-29 | 2019-01-24 | Pinter Caipo, S.A.U. | Cradle assembly for a drafting device of a spinning machine |
LU503151B1 (en) * | 2022-12-07 | 2024-06-07 | Saurer Spinning Solutions Gmbh & Co Kg | Tensioning device and spinning machine |
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US2239863A (en) * | 1937-10-23 | 1941-04-29 | Spinnfaser Akt Ges | Draw frame |
JPS4843976B1 (en) * | 1966-07-06 | 1973-12-21 | ||
DE19547462A1 (en) * | 1995-12-19 | 1997-06-26 | Zinser Textilmaschinen Gmbh | Drawing unit |
DE19626031A1 (en) * | 1996-03-25 | 1997-10-02 | Zinser Textilmaschinen Gmbh | Thick/thin effect filament yarn with partially drawn sections |
WO2015033811A1 (en) | 2013-09-09 | 2015-03-12 | 株式会社 豊田自動織機 | Drafting device in spinning machine |
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US3596458A (en) * | 1966-07-06 | 1971-08-03 | Asahi Chemical Ind | Spun yarn of elastic fiber and preparation thereof |
US3789461A (en) * | 1967-02-24 | 1974-02-05 | Asahi Chemical Ind | Apparatus for preparing spun yarn |
BG41936A1 (en) * | 1985-05-07 | 1987-09-15 | Bakhov | Apparatus for drawing |
IT1290035B1 (en) * | 1996-03-25 | 1998-10-19 | Zinser Textilmaschinen Gmbh | PROCEDURE AND DEVICE TO PRODUCE LARGE / THIN EFFECTS IN A FULLY ORIENTED FILAMENT FEED YARN |
CN101225560B (en) * | 2008-02-04 | 2010-06-09 | 河北太行机械工业有限公司 | Drafting assembly of spinning machine |
CN104060360B (en) * | 2014-06-23 | 2016-09-21 | 嘉兴学院 | SEILE textile resultant yarn method, device and the yarn of a kind of difference in length fiber yarn |
-
2015
- 2015-07-29 JP JP2015149848A patent/JP6358187B2/en not_active Expired - Fee Related
-
2016
- 2016-07-18 ES ES16179877T patent/ES2718243T3/en active Active
- 2016-07-18 EP EP16179877.2A patent/EP3124658B1/en active Active
- 2016-07-18 TR TR2019/06637T patent/TR201906637T4/en unknown
- 2016-07-25 CN CN201610592045.1A patent/CN106400217B/en active Active
Patent Citations (5)
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US2239863A (en) * | 1937-10-23 | 1941-04-29 | Spinnfaser Akt Ges | Draw frame |
JPS4843976B1 (en) * | 1966-07-06 | 1973-12-21 | ||
DE19547462A1 (en) * | 1995-12-19 | 1997-06-26 | Zinser Textilmaschinen Gmbh | Drawing unit |
DE19626031A1 (en) * | 1996-03-25 | 1997-10-02 | Zinser Textilmaschinen Gmbh | Thick/thin effect filament yarn with partially drawn sections |
WO2015033811A1 (en) | 2013-09-09 | 2015-03-12 | 株式会社 豊田自動織機 | Drafting device in spinning machine |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019016414A1 (en) * | 2017-09-29 | 2019-01-24 | Pinter Caipo, S.A.U. | Cradle assembly for a drafting device of a spinning machine |
EP3461938A1 (en) * | 2017-09-29 | 2019-04-03 | Pinter Caipo, S.A.U. | Cradle assembly for a drafting device of a spinning machine |
CN108728950A (en) * | 2018-07-31 | 2018-11-02 | 无锡市恒久电器技术有限公司 | A kind of special drawing-off spinning mechanism of spinning frame |
CN108728950B (en) * | 2018-07-31 | 2024-02-27 | 无锡市恒久电器技术有限公司 | Drafting spinning mechanism special for spinning frame |
LU503151B1 (en) * | 2022-12-07 | 2024-06-07 | Saurer Spinning Solutions Gmbh & Co Kg | Tensioning device and spinning machine |
EP4382647A1 (en) * | 2022-12-07 | 2024-06-12 | Saurer Spinning Solutions GmbH & Co. KG | Tensioning device and spinning machine |
Also Published As
Publication number | Publication date |
---|---|
CN106400217A (en) | 2017-02-15 |
TR201906637T4 (en) | 2019-05-21 |
JP2017031512A (en) | 2017-02-09 |
CN106400217B (en) | 2020-10-16 |
ES2718243T3 (en) | 2019-06-28 |
JP6358187B2 (en) | 2018-07-18 |
EP3124658B1 (en) | 2019-03-06 |
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