JP2012127007A - Draft machine in fore spinning process - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a draft machine in a fore spinning process, having an arm in which pressure parts for pressing top rollers to a side of bottom rollers are supported by a common support part, and capable of cleaning the top rollers by sucking action with a simpler structure than a conventional cleaning machine.SOLUTION: A draft machine 11 comprises: support arms 23-26 for supporting top rollers 15-18, the support arms 23-26 having suction holes 23a-26a formed at positions corresponding to the top rollers 15-18 so as to vertically penetrate through main bodies of the arms; top roller pressure units 11 provided on both sides across the suction holes 23a-26a; and a suction duct 27 having suction ports 27a-27d for exerting sucking action on the suction holes 23a-26a from upper sides of the holes when the support arms 23-26 are arranged in a motion position, the suction duct being provided in a movable manner between an action position in which the suction ports 27a-27d face the suction holes 23a-26a to exert sucking action on the suction holes 23a-26a and a retreat position in which the rotation of the support arms 23-26 is not hindered.

Description

  The present invention relates to a drafting device for a pre-spinning process, and more particularly to a drafting device for a pre-spinning process characterized by a top roller cleaning mechanism.

  In a drafting apparatus for a pre-spinning process that includes a process of drafting a plurality of slivers and bundling them into a single sliver like a drawing machine or a comb, four top rollers (turning) , Front, middle and back) are supported by a sheet metal frame structure.

  The draft roller constituting the draft device is liable to adhere to floating fibers or cotton dust that are not gripped between each pair of draft rollers, and this may cause other fibers to wind around the draft roller. As a result, there are cases where the spinning sliver changes in selenium and makes spinning impossible. Conventionally, a clearer device (cleaning device) shown in FIG. 8 has been proposed as a cleaning device for a top roller of a draft device of a 5-over 4-wire system in a drawing machine (see Patent Document 1).

  In this clearer device, the front top roller 71 and the turning top roller 72 of the draft device D are provided with an amenence type clearer device E in which an endless clearer cloth 73 runs around in contact with the front top roller 71 and is upstream of the front top roller 71. Each top roller 74 is provided with a wiper bar 75 that contacts the roller and cleans it. The suction head 76 disposed above the draft device D is removed by a suction port 78 for sucking cotton dust or floating fibers removed from the clearer cloth 73 by the comb 77 and each wiper bar 75. A plurality of ducts (suction pipes) 79 having suction ports 79a for sucking dust or floating fibers are provided.

  Moreover, as a top roller arm structure that supports each top roller of the draft device in a pressurized state with respect to the bottom roller, a gate-shaped pressing arm that supports each top roller independently is orthogonal to the running direction of the sliver. The thing provided so that rotation within a surface is possible is proposed (for example, refer patent document 2). In Patent Document 2, as shown in FIG. 9, the pressing arm 80 is formed in a gate shape from two side pneumatic cylinders 81a and 81b, a common support element 82, and two cover elements 83a and 83b. Has been. The pressing arm 80 is rotated upward around the pivot bearing 85 together with the top roller 84. The bearings 86a and 86b that receive the top roller 84 are pressed by the rams (piston rods) 87a and 87b of the pneumatic cylinders 81a and 81b.

Japanese Utility Model Publication No. 7-33981 JP 2004-60141 A

  The cleaning device described in Patent Document 1 includes an Amens type clearer device E that removes cotton dust from the front top roller 71 and the like, and a wiper bar 75 that removes cotton dust from each top roller 74 upstream of the front top roller 71. The structure is complicated and the apparatus is increased in size because it includes the suction head 76 for sucking and removing the cotton dust or floating fibers removed by them.

  On the other hand, the draft device is provided with 3 or 4 pairs of draft rollers, and in some cases 5 pairs, so the top arm that supports all the top rollers with one arm of the sheet metal frame structure corresponds to the number of draft roller pairs. Therefore, it is necessary to prepare separate arms. However, the pressing arm 80 of Patent Document 2 uses the pressing arm 80 having basically the same configuration for each top roller, so that the number of draft roller pairs varies depending on the number of draft roller pairs. By preparing the pressing arm 80, it can be dealt with easily.

  However, the pressing arm 80 of Patent Document 2 does not consider the cleaning of the top roller. For example, when a suction-type cleaning device is provided, a suction pipe with a relatively thick suction pipe communicating with a suction duct located above the press arm 80 is used to suck at a low suction pressure before the fiber is wound around the top roller. It is necessary to insert between the 80 support elements 82 to bring the tip of the suction pipe close to the top roller. However, since the interval between the support elements 82 of the adjacent pressing arms 80 cannot be larger than the interval determined by the minimum roller gauge, it is difficult to use a suction pipe having a necessary thickness. In addition, the mechanism for simultaneously moving the plurality of suction pipes inserted between the plurality of pressing arms 80 to the retracted position becomes complicated. Furthermore, if suction pipes are provided under the plurality of pressing arms 80, it is necessary to lengthen the pneumatic cylinders 81a and 81b, which is disadvantageous for securing the rigidity of the pressing arms 80.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to have an arm in which a pressurizing unit that pressurizes the top roller toward the bottom roller is supported by a common support unit, and by suction action. It is an object of the present invention to provide a drafting device for a pre-spinning process capable of cleaning the top roller with a simple configuration as compared with a conventional cleaning device.

  In order to achieve the above object, the invention according to claim 1 is a drafting device of a pre-spinning process provided with a draft part cleaning device, wherein each support arm that supports the top roller corresponds to the top roller body. A suction hole penetrating the arm main body in the vertical direction is formed at a position, and a top roller pressing portion is provided on both sides of the suction hole. A suction duct having a suction port that exerts a suction action on the suction hole from the upper side in a state where the support arm is disposed at the operating position, and the suction port faces the suction hole to the suction hole. It is movably provided between an action position that exerts a suction action and a retreat position that does not hinder the rotation of the support arm. Here, the “pre-spinning process” means, for example, a process in which a plurality of slivers are drafted with a drafting device such as a drawing machine or a comb, and then bundled into one sliver, or a drafting device such as a card. It means a step of making a drafted wide fiber bundle (web) into a sliver. The “operating position of the support arm” means a position where the support arm is in a state of pressing the sliver or fiber bundle in cooperation with the top roller and the bottom roller.

  In this invention, a suction hole penetrating the arm body in the vertical direction is formed between the two top roller pressing portions provided on the support arm that supports the top roller, and the suction duct is disposed at the operating position. Thus, the suction port faces the upper end of the suction hole. A suction action is exerted on the top roller through the suction hole. Therefore, even if the distance between the suction duct and the surface of the top roller is large, a strong suction action can be exerted on the top roller. Accordingly, the pressure roller that pressurizes the top roller toward the bottom roller has an arm supported by a common support, and the top roller can be cleaned with a simpler structure than a conventional cleaning device by suction. Can do.

  According to a second aspect of the present invention, in the first aspect of the present invention, the suction duct has the suction port formed at a position that can face the suction holes of all the support arms, and the front top roller. An opening amount adjusting portion of the suction port formed at a position that can be opposed to the suction hole of the support arm that supports the top roller disposed further upstream is provided.

  The front top roller is easier to wind the fiber than the top roller disposed on the upstream side of the front top roller. In this invention, the suction amount is adjusted by adjusting the opening amount of the suction port by the opening amount adjusting portion provided in the suction port for exerting a suction action on the top roller arranged on the upstream side of the front top roller. Even if the suction force of the source is not increased, the suction action of the suction port that exerts a suction action on the front top roller can be increased.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the suction duct is provided with the suction port so as to exert a suction action only on the suction hole facing the front top roller. ing. In this invention, since the suction action of the suction duct extends only to the suction hole facing the front top roller where the floating fiber or the fleece is likely to be wound, even if the suction capability of the suction source to which the suction duct is connected is low, the front It is possible to suck and remove fibers and cotton dust to be removed before a part of floating fibers or fleece is wound around the top roller.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the suction duct has a cylindrical portion extending in a direction parallel to a direction in which a bottom roller of the draft device extends. The cylindrical portion is configured to be able to move between the operating position and the retracted position with the rotation center as a rotation center, and to be able to communicate with the suction source via the cylindrical portion. According to the present invention, the structure for moving the suction duct between the action position and the retracted position and the structure for efficiently applying the suction action of the suction source to the suction duct are simplified.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the top roller pressurizing portion is configured by a pneumatic cylinder, and the support arm has one of the empty chambers. A piping portion is provided for supplying the pressurized air supplied to the pressure cylinder to the other pneumatic cylinder. In this invention, when pressurized air is supplied to one of the pneumatic cylinders, the pressurized air is supplied to the other pneumatic cylinder via the piping provided on the support arm. Therefore, the piping structure for supplying the pressurized air to the two pneumatic cylinders is simpler than when both the pneumatic cylinders are configured to communicate independently with the pressurized air source via the piping. Become.

  According to the present invention, the pressurizing unit that pressurizes the top roller toward the bottom roller has the arm supported by the common support unit, and the top roller has a simpler configuration than the conventional cleaning device due to the suction action. A drafting device for a pre-spinning process that can be cleaned can be provided.

The partially broken schematic side view of the draft apparatus of one Embodiment. Sectional drawing of a support arm. The schematic perspective view of the draft device in the state where the suction duct was arranged in the operation position. The schematic perspective view of the draft device in the state where the suction duct was arranged in the retreat position. The front view of a support arm. The schematic fragmentary sectional view explaining the effect | action of an opening amount adjustment part. (A) is sectional drawing of the support arm of another embodiment, (b) is a partially broken front view of the support arm of another embodiment. Sectional drawing of a prior art clearer device. The front view which shows the support arm structure of the top roller of a prior art.

Hereinafter, an embodiment in which the present invention is embodied in a comb drafting apparatus as a pre-spinning process will be described with reference to FIGS.
As shown in FIG. 1, a draft device 11 for drafting a plurality of slivers S supplied from a plurality of combing heads of a comb (not shown) includes a front bottom roller 12, a middle bottom roller 13, and a back bottom roller 14. . Each bottom roller 12, 13, and 14 is supported by a roller stand (not shown). A front top roller 15, a middle top roller 16, and a back top roller 17 are disposed on the upper side corresponding to the front bottom roller 12, the middle bottom roller 13, and the back bottom roller 14. On the upper front side of the front bottom roller 12, a turning top roller 18 for changing the traveling direction of the fleece F fed from the front bottom roller 12 and the front top roller 15 downward is disposed. That is, the draft device 11 is a 4-over 3-wire system.

  A gatherer 19 is disposed below the front bottom roller 12 on the front side, and a coiler trumpet 20 of a coiler device and a pair of coiler calendar rollers 21 are sequentially disposed below the gatherer 19. The coiler device advances downward from the gatherer 19 and stores the sliver S after being compressed again by the coiler calender roller 21 in a can with a tube wheel (not shown).

  A draft cleaning device 22 for cleaning the top rollers 15 to 18 is provided above the draft device 11. As shown in FIG. 1, the draft cleaning device 22 includes suction holes 23a, 24a, 25a, 26a formed in support arms 23, 24, 25, 26 that support the top rollers 15-18, and suction holes 23a. , 24a, 25a, and 26a from the upper side, and a suction duct 27 having suction ports 27a, 27b, 27c, and 27d.

  As shown in FIG. 1, in the suction duct 27, the suction ports 27a to 27d are opposed to the suction holes 23a to 26a in the state where the support arms 23 to 26 are arranged at the operating positions, and are formed in the suction holes 23a to 26a. As shown in FIG. 4, it is provided so as to be movable between an action position that exerts a suction action and a retreat position that does not hinder the rotation of the support arms 23 to 26. As shown in FIG. 1, the suction port 27 a is formed on the lower surface of the suction duct 27 so as to be positioned near the front top roller 15 and the turning top roller 18 in a state where the suction duct 27 is disposed at the operating position. A flat cylindrical suction portion 28 is provided so as to protrude.

  As shown in FIGS. 1, 3 and 4, the suction duct 27 has a cylindrical portion 29 extending in a direction parallel to the direction in which the bottom rollers 12 to 14 of the draft device 11 extend, and the cylindrical portion 29 is rotated. It is configured to be movable between an action position and a retracted position as a center. Further, the cylindrical portion 29 is configured to be able to communicate with a suction source (negative pressure source) via a pipe (not shown), and the suction action of the suction source reaches the suction duct 27 via the cylindrical portion 29.

  As shown in FIG. 1, the suction duct 27 has suction ports 27 b and 27 c formed at positions facing the suction holes 24 a and 25 a of the support arms 24 and 25 that support the middle top roller 16 and the backtop roller 17. The opening amount adjusting unit is provided. As opening amount adjusting portions, rubber magnet lid bodies 30 that can be attracted to the lower surface of the suction duct 27 so as to cover the suction ports 27b and 27c are provided corresponding to the suction ports 27b and 27c, respectively. Then, by changing the suction position of the lid 30, the opening amounts of the suction ports 27 b and 27 c can be continuously adjusted between 0% and 100%. An annular member 31 made of a rubber magnet having the same thickness as the lid 30 is adsorbed on the lower surface of the suction duct 27 so as to surround the suction port 27a. The suction duct 27 is formed of a material capable of attracting a magnet, for example, a steel plate, at least at a portion where the lid 30 is attracted.

  Next, the support arms 23 to 26 will be described. Since each support arm 23-26 is the same structure, the support arm 23 for the front top roller 15 is demonstrated. As shown in FIGS. 2 and 3, the support arm 23 is formed with a suction hole 23 a penetrating the arm body 33 in the vertical direction at a position corresponding to the top roller body 32, and the top on both sides across the suction hole 23 a. A roller pressure unit 34 is provided. The support arm 23 supports the rotation shaft 32 a protruding from both sides of the top roller body 32 with a pair of support portions 35. A bearing 36 is attached to the rotary shaft 32a so as to be relatively rotatable.

  The top roller pressure unit 34 is composed of pneumatic cylinders 37a and 37b. The arm body 33 is formed with a pair of communication holes 39 each having a large diameter portion and a small diameter portion for slidingly guiding the piston 38 and the piston rod 38a constituting the pneumatic cylinders 37a and 37b, and the piston rod 38a has a communication hole at its tip. It protrudes from the small diameter part of 39 and is arrange | positioned so that it may contact | abut to the bearing 36. FIG. Housings 40 and 41 are fixed to the arm body 33 so as to cover the large-diameter portion of the communication hole 39, and a pipe 42 communicating with a compressed air source (not shown) is connected to one housing 40. Further, both the housings 40 and 41 are communicated with each other by piping (partially shown in FIGS. 3 and 4), and the pressurized air supplied from the compressed air source to the one pneumatic cylinder 37a is the other pneumatic cylinder 37b. To be supplied.

  As shown in FIG. 2, the support arm 23 is rotatably supported with respect to the support bracket via the support shaft 43 at the end portion on the side where the one pneumatic cylinder 37 a is provided. The support arm 23 supports the front top roller 15 at the end opposite to the side supported by the support shaft 43 in an operating position for holding the fiber bundle to be drafted together with the front bottom roller 12. In a state where the arm 23 is disposed, a locking lever 45 that engages with a locking portion 44 provided on the machine base side and holds the support arm 23 in the operating position is rotatably provided. When the locking lever 45 rotates counterclockwise from the locking position indicated by the solid line in FIG. 2, the locking lever 45 is disposed at the non-locking position indicated by the two-dot chain line.

  Next, the operation of the apparatus configured as described above will be described. In the draft device 11, the support arms 23 to 26 are disposed at the operating positions, and the suction ports 27a to 27d of the suction duct 27 face the suction holes 23a to 26a of the support arms 23 to 26, as shown in FIG. It is driven in a state where it is arranged at the operating position. Each of the bottom rollers 12 to 14 is driven so as to have a draft ratio corresponding to the spinning condition. A plurality of slivers S are drafted at a predetermined magnification to become fleece F and are sent out from the front bottom roller 12 and the front top roller 15, and then pass through the gatherer 19 and the coiler trumpet 20 to form one sliver. After being focused on S and compressed again by the coiler calender roller 21, it is accommodated in a can through a tube wheel.

  While the draft device 11 is being driven, the suction duct 27 is disposed at the working position as shown in FIGS. 1 and 3, and the suction ports 27a to 27d are opposed to the upper ends of the suction holes 23a to 26a of the support arms 23 to 26. The suction action from the suction source is maintained. The suction duct 27 is placed on the support arms 23 to 25 in a state where the annular member 31 and the lid 30 are in contact with the upper surfaces of the support arm 23 and the support arms 24 and 25, respectively, in a state where the suction duct 27 is disposed at the operation position. It becomes a state. The suction action of the suction ports 27a to 27d acts strongly on the top rollers 15 to 18 through the suction holes 23a to 26a. In addition, a suction action extends from the suction port 28a of the suction portion 28 in the vicinity of the front top roller 15 and the turning top roller 18 where floating fibers are likely to be generated. As a result, fibers such as floating fibers are sucked and removed from the suction holes 23 a to 26 a before being wound around the top rollers 15 to 18.

  When preparing the operation of the comber, when a plurality of sliver S supplied from a plurality of combing heads are arranged between the bottom rollers 12-14 and the top rollers 15-18, maintenance work for the bottom rollers 12-14 is performed. When performing, it is necessary to prevent the top rollers 15 to 18 from interfering with work. Therefore, as shown by a two-dot chain line in FIG. 5, the support arms 23 to 26 are arranged at the retracted position. In FIG. 5, only the support arm 23 for the front top roller 15 is shown. The suction duct 27 needs to be disposed at the retracted position before the support arms 23 to 26 are disposed at the retracted position. The suction duct 27 is moved to the operating position and the retracted position with a cylindrical portion 29 extending in a direction parallel to the extending direction of the bottom rollers 12 to 14 as a rotation center. As a configuration that exerts a suction action on each of the top rollers 15 to 18, without providing the suction holes 23 a to 26 a of the support arms 23 to 26, each of the flat cylindrical suction portions from the suction duct 27 is provided like the suction portion 28. When provided corresponding to the top rollers 15 to 18, when the suction duct 27 rotates, some suction portions interfere with the support arms 23 to 26. However, the suction duct 27 is provided with a flat cylindrical suction portion 28 only at a position that does not hinder the rotation, and suction ports 27a to 27d are provided at other positions. It is moved to the operating position and the retracted position.

  Further, the opening amounts of the suction ports 27b and 27c are adjusted so that an appropriate suction action is exerted on the suction holes 23a to 26a via the suction ports 27a to 27d. The opening amount is adjusted by changing the suction position of the lid 30 as shown in FIG.

According to this embodiment, the following effects can be obtained.
(1) The support arms 23 to 26 that support the top rollers 15 to 18 are formed with suction holes 23a to 26a penetrating the arm body 33 in the vertical direction at positions corresponding to the top roller body 32, and the suction holes 23a to 23a. A top roller pressing portion 34 is provided on both sides of 26a. The suction duct 27 having suction ports 27a to 27d exerting a suction action on the suction holes 23a to 26a from the upper side in a state where the support arms 23 to 26 are arranged at the operation position, the suction port 27a and the like are suction holes. It is provided so as to be movable between an action position that exerts a suction action on the suction hole 23a and the like, and a retreat position that does not hinder the rotation of the support arm 23 and the like. Therefore, the pressurizing unit that pressurizes the top rollers 15 to 18 toward the bottom rollers 12 to 14 has an arm supported by a common support unit, and has a simple structure as compared with a conventional cleaning device by a suction action. The rollers 15 to 18 can be cleaned. Further, since the suction duct 27 does not have a suction portion that extends to the vicinity of the top rollers 15 to 18 except for the suction portion 28, the shape of the duct is simplified, and the cost can be reduced.

  (2) The suction holes 23a to 26a exerting a suction action on the top rollers 15 to 18 are provided between the top roller pressing portions 34 provided on both sides of the support arms 23 to 26. Therefore, it is easy to secure a space for providing the suction holes 23a to 26a, and each support arm 23 is compared with a configuration in which the members forming the suction holes 23a to 26a are formed independently of the support arms 23 to 26. ˜26 can be moved to the operating position and the retracted position with no trouble with a simple configuration.

  (3) The suction duct 27 is formed with suction ports 27a to 27d at positions that can face the suction holes 23a to 26a of all the support arms 23 to 26, respectively. And the opening amount of the suction ports 27b and 27c formed in the position which can oppose the suction holes 24a and 25a of the support arms 24 and 25 which support the top rollers 16 and 17 arrange | positioned upstream from the front top roller 15 The adjustment part (lid body 30) is provided. Therefore, by adjusting (squeezing) the opening amounts of the suction ports 27b and 27c by the opening amount adjusting unit, suction that exerts a suction action on the front top roller 15 and the turning top roller 18 without increasing the suction force of the suction source. The suction action of the ports 27a and 27d can be increased.

  (4) The suction duct 27 has a cylindrical portion 29 extending in a direction parallel to the direction in which the bottom rollers 12 to 14 of the draft device 11 extend, and moves to the operating position and the retracted position with the cylindrical portion 29 as a rotation center. It is possible to communicate with the suction source via the cylindrical portion 29. Therefore, the structure for moving the suction duct 27 between the operation position and the retracted position and the structure for efficiently applying the suction action of the suction source to the suction duct 27 are simplified.

  (5) The top roller pressure unit 34 is composed of pneumatic cylinders 37a and 37b. Therefore, compared with the case where a cylinder using a spring is used as the top roller pressing portion 34, the adjustment of the pressing force is simplified.

  (6) As a configuration for supplying pressurized air to the pneumatic cylinders 37a and 37b provided on both sides of each of the support arms 23 to 26, one of the pneumatic cylinders 37a can communicate with a compressed air source via a pipe 42. The pressurized air supplied to the pneumatic cylinder 37a is supplied to the other pneumatic cylinder 37b via a pipe. Therefore, the piping structure for supplying the pressurized air to each of the pneumatic cylinders 37a and 37b becomes simpler than the configuration of supplying the pressurized air to each of the pneumatic cylinders 37a and 37b independently from the compressed air source. .

  (7) The suction duct 27 includes a flat cylindrical suction portion 28 that extends to the vicinity of the front top roller 15 between the support arm 23 and the support arm 26 that are spaced apart from each other in a state where the suction duct 27 is disposed at the operating position. Have. Therefore, it is possible to more efficiently prevent the fiber from being wound around the front top roller 15 where the floating fiber or the like is easily wound without hindering the rotation of the suction duct 27.

  (8) A lid 30 made of rubber magnet is provided as the opening adjustment section, and the amount of the suction openings 27b and 27c not covered, that is, the opening is adjusted by changing the suction position of the lid 30 with respect to the suction duct 27. Therefore, the configuration of the opening amount adjustment unit that can change the opening amount in a stepless manner is simplified.

The embodiment is not limited to the above, and may be embodied as follows, for example.
○ The top roller pressure unit 34 is not limited to the pneumatic cylinders 37a and 37b, but employs a configuration in which the piston 38 is biased in the protruding direction of the piston rod 38a by a coil spring 46, for example, as shown in FIG. May be. In this case, a configuration for supplying pressurized air is not required, the structure is simplified, and the manufacturing cost is reduced.

  A pipe portion 47 that supplies pressurized air supplied to one pneumatic cylinder 37a to the other pneumatic cylinder 37b may be provided in each of the support arms 23 to 26. For example, the support arm 23 will be described. As shown in FIG. 7B, a groove 48 that extends to the vicinity of both the communication holes 39 and is open on the upper side at a position that does not interfere with the suction hole 23a on the upper portion of the arm body 33. The communication hole 39 and the groove 48 are communicated with each other through the hole 49. The upper side of the groove 48 is sealed with a cover 50. In this case, it is not necessary to provide the housing 41 in the other pneumatic cylinder 37b, and each pneumatic cylinder 37a is compared with a configuration in which pressurized air is supplied to each pneumatic cylinder 37a, 37b independently from the compressed air source. , 37b, the piping structure for supplying pressurized air is simplified.

  The suction duct 27 may be configured to have a suction port so as to exert a suction action only on the suction holes 23 a and 26 a facing the front top roller 15 and the turning top roller 18. Floating fibers and fleece wrapping are likely to occur on the front top roller 15 and the turning top roller 18, and depending on the type of spinning fiber, a dedicated suction section may not be provided for the middle top roller 16 or the back top roller 17. In some cases, spinning may not be hindered. In such a case, the suction ports 27b and 27c corresponding to the suction holes 24a and 25a of the support arms 24 and 25 may be omitted, and only the suction ports 27a and 27d may be provided.

  ○ If the suction duct 27 is provided with an opening adjustment section, use it in a state where the opening is zero and the suction action from the suction ports 27b and 27c does not reach the suction holes 24a and 25a of the support arms 24 and 25. May be. In this case, when a fiber for which it is preferable to provide a dedicated suction portion for the middle top roller 16 or the back top roller 17 as the spun fiber is used, it can be easily dealt with.

  The opening adjustment section of the suction duct 27 is not limited to the rubber magnet lid 30 and may be configured such that the shutter can be attached to the suction duct 27 so as to be rotatable or slidable. Also in this case, the opening amount can be adjusted steplessly.

The opening amount adjusting unit of the suction duct 27 may be configured to adjust the opening amount in two stages of full opening and full closing or in three stages of full opening, half opening, and full closing instead of stepless.
○ When the opening adjustment section is formed with the rubber magnet lid 30, only the portion of the suction duct 27 where the lid 30 is attracted is formed of a magnetic material that the magnet adsorbs, and the remaining portion is made of resin or fiber reinforced. It may be made of resin.

  The support portion that rotatably supports the suction duct 27 is not limited to the cylindrical portion 29 having a function of communicating the suction duct 27 with the suction source, and a support portion and a portion that communicates with the suction source are provided independently. Also good.

○ The suction part 28 may be omitted.
The draft device 11 is not limited to a three-wire draft device, and may be a four-wire or five-wire draft device. Further, a two-line draft device including a front roller and a back roller may be used.

The turning top roller 18 disposed on the front side of the draft device 11 may be omitted.
The pre-spinning process is not limited to a drawing machine and a comber, but may be applied to a spinning machine including a process of drafting a plurality of slivers and then binding them to one sliver, for example, a sliver wrap machine or a ribbon wrap machine.

  ○ The pre-spinning process is not limited to a spinning machine having a process of drafting a plurality of slivers and then bundling them into one sliver, and a process of making a wide fiber bundle (web) drafted by a draft device like a card into a sliver A spinning machine equipped with

The following technical idea (invention) can be understood from the embodiment.
(1) In the invention described in claim 3, the opening amount adjusting portion is formed of a rubber magnet that can be attracted to the suction duct 27 in a state of covering the suction port.

  (2) In the invention according to any one of claims 1 to 5 and the technical idea (1), the top roller includes a front top roller and a turning top roller, and the suction duct has a lower surface thereof, In a state where the suction duct is disposed at the operating position, a flat cylindrical suction portion is provided that extends so as to be directed between the front top roller and the turning top roller.

  DESCRIPTION OF SYMBOLS 11 ... Draft device, 12 ... Front bottom roller, 13 ... Middle bottom roller, 14 ... Back bottom roller, 15 ... Front top roller, 16 ... Middle top roller, 17 ... Back top roller, 18 ... Turning top roller, 22 ... Draft Part cleaning device, 23, 24, 25, 26 ... support arm, 23a, 24a, 25a, 26a ... suction hole, 27 ... suction duct, 27a, 27b, 27c, 27d, 28a ... suction port, 29 ... cylindrical part, 32 ... top roller main body, 33 ... arm main body, 34 ... top roller pressurizing part, 37a, 37b ... pneumatic cylinder, 47 ... piping part.

Claims (5)

A drafting device for a pre-spinning process equipped with a draft part cleaning device,
Each support arm that supports the top roller is formed with a suction hole penetrating the arm main body in a vertical direction at a position corresponding to the top roller main body, and a top roller pressure unit is provided on both sides across the suction hole,
A suction duct having a suction port that exerts a suction action on the suction hole from the upper side in a state in which the support arm is arranged at the operating position, and the suction opening faces the suction hole and sucks the suction hole. A drafting device in a pre-spinning process, wherein the drafting device is movably provided between an action position that exerts an influence on the position and a retracted position that does not hinder the rotation of the support arm.   The suction duct has the suction ports formed at positions that can face the suction holes of all the support arms, and the suction of the support arms that support the top roller disposed upstream of the front top roller. The drafting device of the pre-spinning process according to claim 1, further comprising an opening amount adjusting portion of the suction port formed at a position that can face the hole.   The drafting device for a pre-spinning process according to claim 1 or 2, wherein the suction duct is provided with the suction port so as to exert a suction action only on the suction hole facing the front top roller.   The suction duct has a cylindrical portion extending in a direction parallel to a direction in which the bottom roller of the draft device extends, and is movable to the working position and the retracted position with the cylindrical portion as a rotation center, and the cylindrical portion The drafting device of the pre-spinning process as described in any one of Claims 1-3 comprised so that a suction source can be connected via this.   The top roller pressurizing part is constituted by a pneumatic cylinder, and the support arm is provided with a piping part for supplying pressurized air supplied to one of the pneumatic cylinders to the other pneumatic cylinder. The draft apparatus of the pre-spinning process as described in any one of Claims 1-4.

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