CN217973536U

CN217973536U - Draft device, air jet spinning machine, side plate for draft device, and spring box

Info

Publication number: CN217973536U
Application number: CN202221406953.4U
Authority: CN
Inventors: 森秀茂
Original assignee: Murata Machinery Ltd
Current assignee: Murata Machinery Ltd
Priority date: 2021-06-09
Filing date: 2022-06-07
Publication date: 2022-12-06
Anticipated expiration: 2032-06-07
Also published as: JP2022188577A

Abstract

The utility model relates to a draw gear, air jet spinning machine, draw gear are with curb plate and spring box. A draft device (6) is provided with: a draft cradle (40); a spring box (50) installed on the drafting cradle (40); a spring box fixing screw (97) for fixing the spring box (50) to the draft cradle (40); a pair of side plates (80, 80) detachably attached to the spring box (50) and each having a first roller shaft accommodating recess (81) and a second roller shaft accommodating recess (82); a first fixing screw (107) and a second fixing screw (106) for fixing the side plate (80) to the spring box (50); and a front upper roller (17 b) and a middle upper roller (16 b) which are configured in a mode of passing through the first roller shaft accommodating concave part (81) and the second roller shaft accommodating concave part (82).

Description

Draft device, air jet spinning machine, side plate for draft device, and spring box

Technical Field

The utility model relates to a draw gear, air jet spinning machine, for draw gear curb plate and draw gear spring box.

Background

In a spinning machine, a cradle that presses an upper roller (draft roller) against a lower roller of a draft device is known (for example, japanese patent application laid-open No. 2010-168690 (patent document 1) and japanese patent application laid-open No. 2009-001928 (patent document 2)). The cradle is provided with four supporting parts for supporting the front upper roll, the middle upper roll, the third upper roll and the rear upper roll. The support portion is disposed such that a distance between the front upper roller and the upper middle roller or a distance between the third upper roller and the rear upper roller is a predetermined distance.

Patent document 1 describes a structure in which a support structure for supporting the rear upper roller and a support structure for supporting the third upper roller are fixed to the long hole of the cradle. A structure in which a support structure for supporting the front top roll and the middle top roll is fixed to the long hole of the cradle is also described. Patent document 2 describes a structure in which a side plate of a cradle is divided into a front portion supporting front and middle upper rollers and a rear portion supporting third and rear upper rollers.

In the above-described spinning machine, although the arrangement of the upper rolls in the cradle and the gauge are taken into consideration, it tends to take time to adjust or disassemble the members for changing the gauge, and it cannot be said that the gauge change is easy. For example, in patent document 1, when the gauge is changed, it is necessary to remove the shaft support frame, the spring holding frame, and the spring from the cradle, and to attach the plurality of members removed to the cradle again. In patent document 2, when the gauge is changed, it is necessary to temporarily remove and replace a biasing mechanism such as a spring provided in the cradle, in addition to adjusting the position of the side plate.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a draft device, air jet spinning machine, for draft device curb plate and for draft device spring box that can carry out the gauge change of draft roller easily.

The utility model discloses a drafting device possesses: drafting a cradle; a spring box mounted on the drafting cradle; a first fixing portion for fixing the spring box to the draft cradle; a pair of side plates detachably attached to the spring box and each having at least one roller shaft accommodating recess; a second fixing portion for fixing the side plate to the spring box; and at least one draft roller configured to receive the recess through the roller shaft.

According to this draft device, the side plate having the roller shaft accommodating recess is detachably attached to the spring box attached to the draft cradle. By releasing the fixation of the first fixing portion, the spring box can be easily removed from the draft cradle. By releasing the fixation of the second fixing portion, the side plate can be easily removed from the spring box. Therefore, for example, in a state where the spring box is fixed to the draft cradle, only the side plate can be removed from the spring box, and the side plate can be easily replaced. The gauge of the draft roller can be easily changed. In this draft device, if the pressure applied to the draft roller by the spring box is within an effective range, the gauge change can be completed by replacing only the side plate without removing a plurality of members from the draft cradle as in the conventional case.

The draft device may include a front top roll and a middle top roll arranged on an upstream side of the front top roll in the draft direction as draft rolls, wherein two roll shaft accommodating recesses, i.e., a first roll shaft accommodating recess and a second roll shaft accommodating recess, are formed in each of the side plates, the front top roll is arranged to pass through the first roll shaft accommodating recess, and the middle top roll is arranged to pass through the second roll shaft accommodating recess.

According to this configuration, the distance between the front upper roller and the middle upper roller can be easily changed by replacing the side plates.

In the draft device, the side plate may have a first hole portion for the second fixing portion formed downstream of the first roller axis of the first roller shaft accommodating recess in the draft direction, and a second hole portion for the second fixing portion formed downstream of the second roller axis of the second roller shaft accommodating recess in the draft direction.

Since the holes of the second fixing portion may be formed on the downstream side of any of the roller axes, it is possible to avoid a situation in which the distance between the two holes is too short or the holes interfere with each other, and it is possible to pass the degree of freedom of the positions of the holes.

In the draft device, a first distance between the first hole and the first roller axis may be shorter than a second distance between the second hole and the second roller axis.

The positioning of the front top roller when the side plate is attached to the spring box is performed at a position close to the front top roller, whereby the positioning accuracy of the front top roller can be improved.

In the draft device, the side plate may include a reinforcing portion formed around the roller shaft accommodating recess.

According to this structure, the strength of the side panel is improved. The durability of the side plate can be improved with respect to the sliding in the rotational direction of the draft roller.

In the draft device, the pair of side plates may be arranged in bilateral symmetry, and when the side opposite to the side facing the pair of side plates is defined as the outer side, the reinforcing portion may be formed on each of the pair of side plates so as to protrude outward.

According to this configuration, since the reinforcing portions protrude outward on both the left and right sides of the spring case, the strength of the side plate can be increased.

In the draft device, the reinforcing portion of the side plate may be formed to have an inverted U-shaped protruding portion, the spring box may have a pair of side supporting portions to which the side plate is attached, and an arc-shaped or inverted U-shaped recess may be formed in each of the side supporting portions.

According to this configuration, the side plate can be positioned by the reinforcing portion and the recessed portion. More specifically, the contact area between the reinforcement portion and the recess covers a wider range than the positioning by the screw, the screw hole, and the like, so that the positioning of the side plate can be performed with high accuracy.

The utility model discloses an embodiment's air jet spinning machine also can possess: any of the above draft devices; an air jet spinning device disposed downstream of the draft device in the draft direction; and a winding device disposed downstream of the air jet spinning device.

Thus, in the air jet spinning machine, the gauge of the draft roller can be easily changed. Therefore, for example, the time required for the operation associated with the gauge change can be shortened, and therefore, the productivity of the air jet spinning machine associated with the gauge change can be prevented from being lowered.

The utility model discloses a curb plate for draft device is the curb plate for draft device who installs in the spring box of draft device, and it possesses: and a plate-shaped main body portion fixed to the side plate portion of the spring box, the main body portion having at least one roller shaft accommodating recess portion and a step portion for aligning a position in an axial direction of a peripheral edge portion of the roller shaft accommodating recess portion with a position of the side plate portion.

According to the side plate for the draft device, the side plate can be easily removed from the spring box. The side plates can be easily replaced, and the gauge of the draft roller can be easily changed. The peripheral edge of the roller shaft accommodating recess is aligned with the side plate of the spring box by the step portion, so that the position of the upper wall surface in the axial direction does not change when the draft roller is positioned with the side plate as a reference and when the draft roller is positioned with the roller shaft accommodating recess of the side plate as a reference. Therefore, the positioning of the draft roller in the axial direction is also easy.

In the draft device side plate, the peripheral edge portion of the roller shaft accommodating recess may constitute a reinforcing portion of the main body.

According to this structure, the strength of the side panel is improved. The draft roller slides in contact with the roller shaft accommodating recess, but the durability of the side plate can be improved with respect to the sliding of the draft roller.

The utility model discloses a curb plate for drafting device is the curb plate for drafting device who installs in drafting device's spring box, and it possesses: a plate-shaped main body fixed to the side plate of the spring box; the main body portion has at least one roller shaft accommodating recess, and a reinforcing portion formed around the roller shaft accommodating recess.

According to the side plate for the draft device, the side plate can be easily removed from the spring box. The side plates can be easily replaced, and the gauge of the draft roller can be easily changed. The strength of the side panel is improved by the reinforcing portion. The draft roller slides in the roller shaft accommodating recess, but the durability of the side plate can be improved with respect to the sliding of the draft roller.

In the draft device side plate, the main body may have a flat plate portion overlapping with the side plate portion of the spring box, and the reinforcing portion may be formed in a rib shape protruding from the flat plate portion.

With this configuration, the rib-shaped reinforcing portion can be formed to have the same thickness as that of the flat plate portion. That is, the reinforcing portion is not formed by a method of increasing the thickness. The draft roller is firmly supported by the side plate, and the draft cradle (draft device) is not excessively heavy when the draft roller and the side plate are attached to the draft device. Therefore, the operability is not degraded.

In the side plate for draft device, the reinforcing portion may protrude by 2.4mm to 3.5mm from the flat plate portion overlapping with the side plate portion of the spring box. According to this structure, the strength around the roller shaft accommodating recess can be increased without increasing the size of the entire side plate.

In the side plate for draft device, the reinforcing portion may be formed in an inverted U-shape. According to this configuration, when the side plate is attached to the spring box, the side plate is easily positioned.

In the side plate for a draft device, the main body may be formed as two roller shaft accommodating recesses, and the first roller shaft accommodating recess and the second roller shaft accommodating recess may be formed.

In recent years, the drawing speed (spinning speed) has been remarkably increased. With the increase in the draft speed, particularly the rotation speed of the front roller, the stable rotation of the front top roller becomes a problem. If the rotation of the front top roller is unstable, the draft quality (yarn quality) may be degraded. The utility model discloses a curb plate is provided with rib and supplementary rib, so as to be used for making preceding roller rotatory part steadily, helps drafting assembly's performance to maintain. In addition, with the high-speed rotation of the draft roller, for example, even if the side plate is worn, the side plate can be easily replaced.

The utility model discloses a spring box for drafting arrangement possesses: a main body portion; and a biasing portion attached to the main body portion, the main body portion including: a planar portion to which the force applying portion is attached and which extends in the draft direction and an axial direction orthogonal to the draft direction; a pair of first side plate portions provided at both ends of the planar portion in the axial direction; and a pair of second side plate portions provided at both ends of the planar portion in the draft direction, wherein the first side plate portion is shorter than the second side plate portions in a vertical direction orthogonal to both the draft direction and the axial direction.

According to the spring box for a draft device, the side plate having the roller shaft accommodating recess can be detachably attached to the first side plate portion. The side plate can be easily removed from the first side plate portion. Therefore, the side plate can be easily replaced, and the gauge of the draft roller can be easily changed.

In the draft device spring box, an arc-shaped or inverted U-shaped recess opening downward may be formed in the first side plate portion of the draft device spring box.

According to this configuration, the side plate can be positioned by fitting the inverted U-shaped protruding portion of the side plate into the recessed portion.

In the draft device spring box, the depth of the recess of the first side plate portion may be smaller than the radius of the draft roller supported by the main body.

According to this structure, the side plate is easily fitted into the first side plate.

Drawings

Fig. 1 is a front view of an air jet spinning machine according to an embodiment of the present invention.

Fig. 2 is a side view of a spinning unit of the air jet spinning machine shown in fig. 1.

Fig. 3 is a side view showing the draft device in fig. 2.

Fig. 4 is a perspective view of the draft device.

Fig. 5 is an exploded perspective view of the draft device.

Fig. 6 is an exploded perspective view showing the draft device viewed from the downstream side in the draft direction.

Fig. 7 is an exploded perspective view showing the spring box and the pair of side plates.

Fig. 8 is a front view of the side panel.

Fig. 9 is a perspective view of the side plate.

Fig. 10 is a perspective view showing the side plate as viewed obliquely from below.

Fig. 11 is a bottom view of the side plate.

Fig. 12 is a cross-sectional view taken along a plane parallel to the XY plane in the vicinity of the first roller shaft accommodating recess.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and overlapping description thereof will be omitted.

As shown in fig. 1, a spinning machine (air jet spinning machine) 1 includes: a plurality of spinning units 2, a yarn splicing cart 3, a doffing cart (not shown), a first end frame 4, and a second end frame 5. The plurality of spinning units 2 are arranged in a row. Each spinning unit 2 generates a yarn Y and winds the yarn Y into a package P. When the yarn Y is cut in a certain spinning unit 2 or for some reason, the yarn Y is cut, the yarn splicing cart 3 performs yarn splicing operation in the spinning unit 2. When the package P becomes full in a spinning unit 2, the doffing cart doffs the package P and supplies a new bobbin B to the spinning unit 2. The first end frame 4 houses a recovery device and the like for recovering lint, yarn waste, and the like generated in the spinning unit 2.

An air supply unit that accommodates the second end frame 5 and adjusts the air pressure of compressed air (air) supplied to each unit of the spinning machine 1 to supply air to each unit; and a drive motor for supplying power to each part of the spinning unit 2. The second end frame 5 is provided with a console control device 100, a touch panel screen 102, and input keys 104. The machine control device 100 centrally manages and controls each part of the spinning machine 1. The touch panel screen 102 can display information and the like related to the setting content and/or the state of the spinning unit 2. The operator can perform the setting operation of the spinning unit 2 by performing an appropriate operation using a button displayed on the touch panel screen 102, an input key 104, or the like.

As shown in fig. 1 and 2, each spinning unit 2 includes a draft device 6, an air jet spinning device 7, a yarn monitoring device 8, a tension sensor 9, a yarn accumulating device 11, a waxing device 12, and a winding device 13 in this order from the upstream side in the traveling direction of the yarn Y. The unit controller 10 is provided for each predetermined amount of the spinning units 2, and controls the operation of the spinning units 2.

The draft device 6 drafts the fiber bundle (sliver) S. The draft device 6 includes a rear roller pair 14, a third roller pair 15, an intermediate roller pair 16, and a front roller pair 17 in this order from the upstream side in the traveling direction of the fiber bundle S.

The rear roller pair 14 includes a rear lower roller 14a on the driving side and a rear upper roller 14b on the driven side. The rear lower roller 14a and the rear upper roller 14b face each other with a travel path through which the fiber bundle S travels. The third roller pair 15 includes a third lower roller 15a on the driving side and a third upper roller 15b on the driven side. The third lower roller 15a and the third upper roller 15b face each other with a travel path through which the fiber bundle S travels. The intermediate roller pair 16 includes a lower intermediate roller 16a on the driving side and an upper intermediate roller 16b on the driven side. The intermediate lower roller 16a and the intermediate upper roller 16b face each other with a travel path through which the fiber bundle S travels. The front roller pair 17 includes a driving side front lower roller 17a and a driven side front upper roller 17b. The lower front roller 17a and the upper front roller 17b face each other with a travel path for the fiber bundle S traveling therebetween.

The rear lower roller 14a, the third lower roller 15a, the intermediate lower roller 16a, and the front lower roller 17a are rotated at different rotational speeds by a drive motor provided in the spinning unit 2 so as to be faster as the rollers on the downstream side are closer. A flap belt 18a is provided for the intermediate lower roller 16 a. A baffle belt 18b is provided for the upper intermediate roller 16b. The front lower roller 17a and the intermediate lower roller 16a may be driven by a drive motor provided in common in the second end frame 5 of the plurality of spinning units 2.

The rear upper roller 14b, the third upper roller 15b, the middle upper roller 16b, and the front upper roller 17b are rotatably supported by the draft cradle 40. The rear upper roller 14b, the third upper roller 15b, the middle upper roller 16b, and the front upper roller 17b are driven to rotate by being brought into contact with the rear lower roller 14a, the third lower roller 15a, the middle lower roller 16a, and the front lower roller 17a at a predetermined pressure.

The air jet spinning device 7 twists the fiber bundle S drafted by the draft device 6 by a whirling air flow, thereby generating a yarn Y. The air jet spinning device 7 continuously spins the yarn Y at a constant speed. The air jet spinning device 7 has a fiber guide section, a swirling air flow generating nozzle, and a hollow guide shaft body, although detailed description and illustration thereof are omitted. The fiber guide section guides the fiber bundle S supplied from the draft device 6 on the upstream side to a spinning chamber formed inside the air jet spinning device 7. The swirling-air-flow generating nozzle is disposed around a path along which the fiber bundle S travels. The air is ejected from the whirling air flow generating nozzle, thereby generating a whirling air flow in the spinning chamber. The fiber ends of the plurality of fibers constituting the fiber bundle S are reversely rotated by the whirling airflow. The hollow guide shaft guides the spun yarn Y from the spinning room to the outside of the air jet spinning device 7.

The yarn monitoring device 8 monitors information of the running yarn Y between the air jet spinning device 7 and the yarn accumulating device 11, and detects the presence or absence of a yarn defect based on the monitored information. When detecting a yarn defect, the yarn monitoring device 8 transmits a yarn defect detection signal to the unit controller 10. The yarn monitoring device 8 detects, for example, a yarn defect, such as an abnormal thickness of the yarn Y and/or a foreign substance contained in the yarn Y. The yarn monitoring device 8 also detects yarn breakage or the like.

The tension sensor 9 measures the tension of the running yarn Y between the air jet spinning device 7 and the yarn accumulating device 11, and transmits a tension measurement signal to the unit controller 10. When the unit controller 10 determines that there is an abnormality based on the detection result of the yarn monitoring device 8 and/or the tension sensor 9, the yarn Y is cut in the spinning unit 2. Specifically, the air supply to the air jet spinning device 7 is stopped, and the yarn Y is cut by interrupting the generation of the yarn Y. Alternatively, the yarn Y may be cut by a cutter provided separately.

The waxing device 12 waxes the yarn Y between the yarn accumulating device 11 and the winding device 13.

The yarn accumulating device 11 accumulates the yarn Y between the air jet spinning device 7 and the winding device 13. The yarn accumulating device 11 includes a yarn accumulating roller for accumulating the yarn Y by winding the yarn Y around the outer peripheral surface. The yarn accumulating device 11 has a function of stably drawing out the yarn Y from the air jet spinning device 7, a function of preventing the yarn Y fed out from the air jet spinning device 7 from being accumulated and slackened at the time of a yarn splicing operation by the yarn splicing cart 3 or the like, and a function of preventing a variation in tension of the yarn Y on the downstream side of the yarn accumulating device 11 from being transmitted to the air jet spinning device 7.

The winding device 13 winds the yarn Y around the bobbin B to form a package P. The winding device 13 includes a cradle arm 21, a winding drum 22, and a traverse guide 23. The cradle arm 21 rotatably supports the bobbin B. The swing arm 21 is swingably supported by a support shaft 24 so that the surface of the bobbin B or the surface of the package P contacts the surface of the winding drum 22 with an appropriate pressure. A drive motor (not shown) provided in the second end frame 5 simultaneously drives the take-up drums 22 of the plurality of spinning units 2. Thereby, in each spinning unit 2, the bobbin B or the package P rotates in the winding direction. The traverse guide 23 of each spinning unit 2 is provided on a shaft 25 shared by the plurality of spinning units 2. The driving motor of the second end frame 5 reciprocally drives the shaft 25 in the direction of the rotation axis of the winding drum 22, whereby the traverse guide 23 traverses the yarn Y with a predetermined width with respect to the rotating bobbin B or package P.

When the yarn Y is cut in a certain spinning unit 2 or is cut for some reason, the yarn splicing cart 3 moves to the spinning unit 2 and performs a yarn splicing operation. The joint carriage 3 includes a joint device 26, a suction pipe 27, and a suction port 28. The suction pipe 27 is rotatably supported by a support shaft 27a, and captures the yarn Y from the air jet spinning device 7 and guides the yarn Y to the yarn splicing device 26. The suction port 28 is rotatably supported by a support shaft 28a, and captures the yarn Y from the winding device 13 and guides the yarn Y to the yarn splicing device 26. The yarn splicing device 26 splices the guided yarns Y to each other. The yarn splicing device 26 is a splicer using compressed air, a knotter mechanically splicing the yarn Y, or the like.

When the yarn splicing operation is performed by the yarn splicing cart 3, the package P is rotated (reversed) in the reverse winding direction. At this time, the cradle arm 21 is moved by an air cylinder (not shown) so that the package P is separated from the winding drum 22, and the package P is reversed by a reverse rotation roller (not shown) provided on the joint carriage 3.

As described above, the spinning unit 2 (spinning machine 1) of the present embodiment includes the draft device 6, the air jet spinning device 7 disposed on the downstream side of the draft device 6, and the winding device 13 disposed on the downstream side of the air jet spinning device 7. The draft device 6 will be described in more detail below.

In the draft device 6, the plurality of roller pairs 14, 15, 16, and 17 draft the fiber bundle S supplied from a can (not shown) and advance the fiber bundle S from the upstream side to the downstream side, and supply the fiber bundle F to the air jet spinning device 7. Hereinafter, the direction along the traveling path of the fiber bundle S is referred to as "draft direction". The upstream side in the draft direction is simply referred to as "upstream side", and the downstream side in the draft direction is simply referred to as "downstream side".

In the drawings of fig. 3 and the following, the X axis, the Y axis, and the Z axis are shown for convenience of explanation. The + Y-axis direction is the draft direction. The X-axis direction is the axial direction of the front top roller 17b and the middle top roller 16b (draft rollers). In the present specification, the "left-right direction" is the X-axis direction and is a direction orthogonal to the draft direction. The "vertical direction" is a Z direction and is a direction orthogonal to both the draft direction and the horizontal direction. The X, Y and Z axes are mutually orthogonal.

The

lower rollers

14a, 15a, 16a, and 17a are rotatably supported by the base 45. In fig. 3, all the

lower rollers

14a, 15a, 16a, and 17a are illustrated as being supported by one base 45. However, the base 45 may be formed of a plurality of portions, and each portion may support each lower roller. The

lower rolls

14a, 15a, 16a and 17a are driven to rotate at mutually different rotational speeds so as to be faster on the downstream side.

As shown in fig. 1, 3, 4, and 5, the draft device 6 includes a draft cradle 40; a spring case 50; a pair of

side plates

80, 80; a front upper roller 17b and a middle upper roller 16b. The spring box 50 is mounted to the draft cradle 40. The pair of

side plates

80, 80 are detachably attached to the spring box 50, and each have a first roller shaft accommodating recess portion (roller shaft hole) 81 and a second roller shaft accommodating recess portion (roller shaft hole) 82. The front upper roller 17b is disposed to pass through the first roller shaft accommodating recess 81. The upper intermediate roller 16b is disposed to pass through the second roller shaft accommodating recess 82. That is, the draft device 6 includes a front top roller 17b as a draft roller and an intermediate top roller 16b arranged on the upstream side of the front top roller 17b in the draft direction.

The draft device 6 includes a draft cradle 40, a spring box 50 attachable to and detachable from the draft cradle 40, and a pair of side plates 80 attachable to and detachable from the spring box 50. In the draft cradle 40 of the present embodiment, each component can be easily disassembled. The draft device 6 includes, for example, two spring box fixing screws 97 (first fixing portions) for fixing the spring box 50 to the draft cradle 40. For example, the spring case fixing screws 97 are inserted into the two through holes 57 (see fig. 7) formed in the flat surface portion 54 of the spring case 50 and the two through holes 46b (see fig. 5) formed in the attachment plate 46 of the main body cover 41. The spring box 50 is attached and fixed to the draft cradle 40 by fastening the spring box fixing screw 97, a nut, and the like. By removing the spring box fixing screw 97, the spring box 50 can be easily removed from the draft cradle 40.

The draft device 6 includes, for example, a first fixing screw 107 and a second fixing screw 106 (see fig. 4 and 5) as a second fixing portion for fixing the side plate 80 to the box spring 50. By removing the first fixing screws 107 and the second fixing screws 106, the side plate 80 can be easily removed from the spring box 50.

This makes it possible to easily replace the side plate 80 as a consumable part in the draft device 6. Even in a state where the spring box 50 is fixed to the draft cradle 40, the side plate 80 can be easily removed. The structure associated with the side plate 80 will be described in detail later. Further, before the side plate 80 is removed from the spring box 50, the middle upper roller 16b, the front upper roller 17b, and the like are removed from the side plate 80.

The structure of the front upper roller 17b will be described with reference to fig. 6. As shown in fig. 6, the front upper roller 17b extends in the left-right direction. The front top roller 17b includes a front roller shaft 71, and a pair of rubber rollers 71c provided at both left and right end portions of the front roller shaft 71. The front roller shaft 71 includes a shaft main body 71a disposed at the center below the spring case 50, and a pair of small diameter portions 71b continuous with both right and left ends of the shaft main body 71 a. Each small diameter portion 71b has a diameter smaller than that of the shaft main body portion 71 a. The pair of rubber rollers 71c are located outside the side plates 80.

As shown in fig. 1 and 3, the draft cradle 40 rotatably supports the

upper rolls

14b, 15b, 16b, and 17b of the draft device 6 provided in each of the pair of adjacent spinning units 2. For example, two adjacent rubber rollers 71c (see fig. 4) are attached to the respective axial ends of one front roller shaft body 71. Two adjacent rubber rollers 61c (see fig. 4) are attached to the respective axial ends of one intermediate roller shaft body 61.

The front roller shaft 71 is held by a plate spring 59 (see fig. 5 and 7) provided inside the spring case 50. The intermediate roller shaft body 61 is also held by a plate spring 59 (see fig. 5) provided inside the spring case 50. Each shaft body of the rear top roller 14b and the third top roller 15b is also held by a leaf spring 58 (see fig. 5) provided inside the spring case 50. The upper rolls are prevented from falling from the spring box 50 by the plate spring.

As shown in fig. 3 and 4, the draft cradle 40 includes a body cover 41 and a pair of mounting plates 46 extending leftward and rightward from the body cover 41. The body cover 41 and the attachment plate 46 are made of metal plates.

A rotating shaft 43 is provided at an upstream end of the draft cradle 40. The rotating shaft 43 rotatably supports the draft cradle 40 between a contact position where the

upper rollers

14b, 15b, 16b, and 17b contact the

lower rollers

14a, 15a, 16a, and 17a and a separated position where the

upper rollers

14b, 15b, 16b, and 17b are separated from each other.

A handle 44 used when an operator performs a turning operation of the draft cradle 40 is provided at a downstream end of the draft cradle 40. When the draft cradle 40 is rotated to the contact position, a hook (not shown) provided at the lower end portion of the handle 44 engages with a fixed roller (not shown) provided at the downstream end portion of the base 45, and the

upper rollers

14b, 15b, 16b, and 17b and the

lower rollers

14a, 15a, 16a, and 17a are held in contact with each other with a predetermined pressure.

In the draft device 6, the fiber bundle S is drafted by the rear roller pair 14, the third roller pair 15, the intermediate roller pair 16, and the front roller pair 17 rotating at different rotational speeds, and is conveyed to the air jet spinning device 7 as a fiber bundle F. In order to perform draft appropriately, in the draft device 6, it is necessary to appropriately set the intervals (i.e., pitches) in the draft direction of the rear roller pair 14, the third roller pair 15, the intermediate roller pair 16, and the front roller pair 17. The gauge of the drafting rollers can vary depending on the type of fiber being spun and/or other conditions.

In the draft device 6, the positions of the rear lower roller 14a and the third lower roller 15a on the base 45 can be adjusted along the draft direction. In the draft cradle 40, the positions of the rear top roller 14b and the third top roller 15b can be adjusted along the draft direction. This makes it possible to adjust the distance between the adjacent roller pairs 14 and 15 and the distance between the adjacent roller pairs 15 and 16, for example, according to the fiber length of the drafted fiber bundle S. In the draft cradle 40, the positions and the intervals of the middle top roller 16b and the front top roller 17b can be adjusted along the draft direction by changing (replacing) the type of the side plate 80.

Next, the spring box 50 attached to the draft cradle 40 will be described with reference to fig. 4 to 7. As shown in fig. 7, the spring case 50 includes a main body 51 and an urging portion 52. The main body 51 supports the front upper roller 17b and the middle upper roller 16b via the side plate 80. The biasing portion 52 is attached to the body 51 and biases the front top roller 17b and the middle top roller 16b downward (in the-Z-axis direction in the drawing). The main body 51 has a flat surface 54 extending in the axial direction and the draft direction of the front top roller 17b and the middle top roller 16b. The main body 51 has a cubic shape extending in the axial direction and the draft direction as a whole. The biasing portion 52 protrudes upward at the center in the axial direction of the main body portion 51.

As shown in fig. 4 and 5, the body cover 41 accommodates the biasing portion 52 therein, and the flat surface portion 54 is fixed to the attachment plate 46, whereby the spring box 50 is fixed to the inside of the draft cradle 40. The main portion of the spring box 50 including the main body 51 and the frame 52a of the biasing portion 52 is formed of a metal plate.

As shown in fig. 7, the biasing portion 52 includes a frame 52a extending in the draft direction, and a plurality of pressing springs 52b housed in the frame 52a and arranged in the draft direction. Each of the pressing springs 52b is, for example, a compression coil spring. A pressing shaft body 52c is inserted into each pressing spring 52b. A circular receiving plate 52f is fixed to a lower portion of each pressing shaft body 52c, and a lower end of the pressing spring 52b presses the receiving plate 52f. The lower end of each pressing shaft 52c passes through a through hole 52e formed in the planar portion 54. The lower end portion of the one pressing shaft body 52c abuts against the axial center portion of the front roller shaft body 71 (the center portion of the shaft body 71a shown in fig. 6). The lower end portion of the one pressing shaft body 52c abuts against the axial center portion of the intermediate roller shaft body 61. Thereby, a pressing force is applied to the front upper roller 17b or the middle upper roller 16b. The biasing portion 52 is configured to bias the front upper roller 17b or the middle upper roller 16b downward (toward the front lower roller 17a or the middle lower roller 16 a) via each pressing shaft body 52c.

The pressing force against the front upper roller 17b and the middle upper roller 16b can be adjusted by rotating an adjusting portion 52h provided so as to be exposed to the frame 52 a. The adjusting portion 52h can be operated by the hand of the operator from the outside of the body cover 41 (see fig. 4) while keeping the spring box 50 attached to the draft cradle 40.

As shown in fig. 4 and 5, two spring boxes 90 that support the third top roller 15b and the rear top roller 14b are attached to the draft cradle 40 in addition to the spring box 50. A pair of side plates 91 are detachably attached to both ends of each spring box 90 in the axial direction. The third upper roller 15b is supported by a pair of side plates 91. The rear upper roller 14b is supported by the other pair of side plates 91.

As shown in fig. 4, the spring box 90 supporting the third upper roller 15b is fixed to the mounting plate 46 by a spring box fixing screw 95. The spring box 90 supporting the rear upper roller 14b is fixed to the mounting plate 46 by a spring box fixing screw 94. The two spring boxes 90 are attached and fixed to the attachment plate 46 of the draft cradle 40 by inserting the spring box fixing screws 95 and 94 into the elongated holes 46a provided so as to extend in the draft direction and fastening the spring box fixing screws 95 and 94 to nuts and the like. By moving the spring

case fixing screws

95 and 94 in the elongated hole 46a, the position of the rear top roller 14b and the third top roller 15b in the draft direction can be adjusted.

Although there are different points in that the spring box 50 supports the two

roller shafts

71, 61 and each spring box 90 supports one roller shaft, each spring box 90 has substantially the same configuration as the spring box 50. That is, each spring box 90 has a biasing portion 92 housed in the body cover 41, and biases the third upper roller 15b or the rear upper roller 14b downward.

Next, the mounting structure of the side plate 80 to the spring box 50 and the structure of the side plate 80 will be described in detail with reference to fig. 5 to 11. As shown in fig. 7, the spring box 50 includes a pair of first side plate portions (side support portions) 55 provided at both ends of the planar portion 54 in the axial direction, and a pair of second side plate portions 56 provided at both ends of the planar portion 54 in the draft direction. Each first side plate portion 55 and each second side plate portion 56 are formed to be continuous with the flat surface portion 54 by bending one metal plate. The first side plate portions 55 and the second side plate portions 56 are bent perpendicularly to the flat surface portion 54.

As shown in fig. 6 and 7, the spring box 50 is formed to be symmetrical in left and right. In the main body 51, the pair of first side plate portions 55 is plane-symmetrical with respect to a center plane parallel to the YZ plane. The pair of side plates 80 is also arranged symmetrically left and right. The pair of side plates 80 is plane-symmetric with respect to a central plane parallel to the YZ plane. The pair of side plates 80 are completely the same in material, size, and shape, except that they have a symmetrical shape. In the following description, only the structure of one side plate 80 will be described, and the structures of both side plates 80 can be understood. In fig. 7 and 8, although a pair of side plates 80 are shown, in fig. 9 to 12, only the side plate 80 on the back side (left side in fig. 6) shown in fig. 7 is shown.

As shown in fig. 7, 8, and 9, the side plate 80 includes a plate-shaped main body portion 80M fixed to the first side plate portion 55 of the spring box 50. The main body 80M is made of a metal plate. The main body 80M includes a first roller shaft accommodating recess 81 and a second roller shaft accommodating recess 82 as two roller shaft accommodating recesses through which the draft rollers pass.

Each of the first roller shaft accommodating recess 81 and the second roller shaft accommodating recess 82 has an inverted U shape that opens downward.

The front roller shaft body 71 of the front upper roller 17b is disposed in the first roller shaft accommodating recess 81. The intermediate roller shaft body 61 of the upper roller 16b is disposed in the second roller shaft accommodating recess 82. That is, the front roller shaft body 71 of the front upper roller 17b is disposed to pass through the first roller shaft accommodating recess 81 of the pair of side plates 80. The small diameter portion 71b of the front roller shaft body 71 passes through the first roller shaft accommodating recess 81.

The intermediate roller shaft body 61 of the intermediate upper roller 16b is disposed to pass through the second roller shaft accommodating recess 82 of the pair of side plates 80. The small diameter portion of the intermediate roller shaft body 61 passes through the second roller shaft accommodating recess 82.

The main body portion 80M also has a trapezoidal cutout 83. The notch 83 is disposed between the first roller shaft accommodating recess 81 and the second roller shaft accommodating recess 82, and receives the baffle tape support 18c of the baffle tape 18b.

The main body 80M has a rectangular flat plate portion 80a that overlaps the first side plate portion 55 of the spring box 50. The flat plate portion 80a is formed with the first roller shaft accommodating recess 81 and the second roller shaft accommodating recess 82.

In the first roller shaft accommodating recess 81, the radius of the upper arc portion (the arc portion located at the end region in the + Z direction) is set to a radius suitable for the front roller shaft body 71 of the front upper roller 17b. The width (distance in the draft direction) of the lower parallel portion continuous with the circular arc portion is set to a diameter suitable for the front roller shaft body 71.

In the second roller receiving recess 82, the radius of the upper arcuate portion (+ arcuate portion in the end region in the Z direction) is set to a radius suitable for the intermediate roller shaft body 61 of the intermediate upper roller 16b. The width (distance in the draft direction) of the lower parallel portion continuous with the circular arc portion is set to a diameter suitable for the intermediate roller shaft body 61.

The radius of the arc portion and the width of the parallel portion of the first roller shaft accommodating recess 81 are adjusted to be able to just receive the small diameter portion 71b of the front roller shaft body 71. A step portion 71e is formed between the shaft main body portion 71a and each small diameter portion 71b. The pair of step portions 71e are restricted from moving in the axial direction by the flat plate portions 80a of the pair of side plates 80. This positions the front roller shaft 71 in the axial direction.

The same applies to the second roller-shaft accommodating recess 82 and the intermediate roller shaft body 61.

The front upper roller 17b supported by the first roller shaft accommodating recess 81 slides along the peripheral surface of the first roller shaft accommodating recess 81 while rotating. The upper and lower rollers 16b supported by the second roller shaft accommodating recess 82 slide along the circumferential surface of the second roller shaft accommodating recess 82 while rotating. The small diameter portion 71b of the front upper roller 17b slides along the circumferential surface of the first roller shaft accommodating recess 81. The small diameter portion of the intermediate upper roller 16b slides along the peripheral surface of the second roller shaft accommodating recess 82. Therefore, the side plate 80 is a member worn out over time, and needs to be replaced after a predetermined period of time.

The main body portion 80M includes a first reinforcing portion 84 formed in a rib shape protruding from the flat plate portion 80a around the first roller shaft accommodating recess 81, and a second reinforcing portion 85 formed in a rib shape protruding from the flat plate portion 80a around the second roller shaft accommodating recess 82. The first roller shaft accommodating recess 81 and the second roller shaft accommodating recess 82 can be formed by press working or the like, for example.

The first reinforcing portion 84 and the second reinforcing portion 85 increase the strength of each side plate 80. In a state where the side plate 80 is attached to the spring case 50, the first reinforcing portion 84 and the second reinforcing portion 85 protrude outward. The term "outside" refers to the outside of the body 51 in the lateral direction, i.e., the side away from the biasing portion 52.

As shown in fig. 9, the surface 80aa of the flat plate portion 80a forms a flat surface extending along the YZ plane. As shown in fig. 10, the rear surface 80ab of the flat plate portion 80a forms a flat surface extending along the YZ plane. Each of the first reinforcing portion 84 and the second reinforcing portion 85 protrudes axially outward in a state of having the same thickness as that of the flat plate portion 80a. Each of the first reinforcing portion 84 and the second reinforcing portion 85 is formed to have an inverted U-shaped protruding portion. Thus, a first stepped portion 84s having an inverted U-shape is formed around the first roller shaft accommodating recess 81, and a second stepped portion 85s having an inverted U-shape is formed around the second reinforcing portion 85.

As shown in fig. 11, the first reinforcing portion 84 protrudes by, for example, 2.4mm or more and 3.5mm or less from the flat plate portion 80a overlapping with the first side plate portion 55 of the spring case 50. The second reinforcing portion 85 protrudes by, for example, 2.4mm or more and 3.5mm or less from the flat plate portion 80a overlapping with the first side plate portion 55 of the spring box 50. The above-mentioned value corresponds to the projection length T shown in fig. 11. The projection length T is a distance between the inner face 80ab of the flat plate portion 80a and the first rib surface 84a of the first reinforcing portion 84 (or the second rib surface 85a of the second reinforcing portion 85).

As shown in fig. 9 and 10, a first auxiliary reinforcing portion 88 bent at a right angle to the flat plate portion 80a (main body portion 80M) is formed only above the second roller shaft accommodating recess 82 supporting the middle upper roller 16b. The first auxiliary reinforcing portion 88 extends parallel to the XY plane and is formed over the second roller shaft accommodating recess 82 and the notch 83. The side plate 80 is "upward" on the side opposite to the open sides of the first roller shaft accommodating recess 81 and the second roller shaft accommodating recess 82.

Further, a pair of second auxiliary reinforcing portions 89 bent at right angles to the flat plate portion 80a are formed at both ends of the flat plate portion 80a in the draft direction. The first auxiliary reinforcing portion 88 and the pair of second auxiliary reinforcing portions 89 each protrude inward of the flat plate portion 80a. The projecting direction of the first reinforcing portion 84 and the second reinforcing portion 85 and the projecting direction of the first auxiliary reinforcing portion 88 and the second auxiliary reinforcing portion 89 are parallel to the axial direction, but opposite to each other.

As shown in fig. 8, a first hole 87 for a first fixing screw 107 (see fig. 4 and 5) is formed in the flat plate portion 80a of the side plate 80 on the downstream side (on the right side in the figure) of the center axis of the first roller shaft accommodating recess 81 (first roller axis line) and the rotation axis of the front upper roller 17b disposed in the first roller shaft accommodating recess 81. The flat plate portion 80a has a second hole 86 for a second fixing screw 106 (see fig. 4 and 5) formed on a downstream side (right side in the drawing) of the center axis of the second roller accommodating recess 82 (second roller axis, the rotation axis of the intermediate upper roller 16b disposed in the second roller accommodating recess 82).

The first hole 87 is formed at a corner portion on the upper and downstream sides of the flat plate portion 80a. The second hole 86 is formed in an upper portion of the flat plate portion 80a and in an intermediate portion (above the notch 83) between the first roller shaft accommodating recess 81 and the second roller shaft accommodating recess 82. As is clear from fig. 8, a first distance between the central axis of the first roller shaft accommodating recess 81 and the first hole portion 87 is shorter than a second distance between the central axis of the second roller shaft accommodating recess 82 and the second hole portion 86. Since the rotation speed of the front upper roller 17b is much greater than that of the middle upper roller 16b, the position of the first hole 87, that is, the fixing position of the first fixing screw 107 is brought close to the first roller shaft accommodating recess 81 in order to appropriately support the front upper roller 17b.

Referring back to fig. 7, the first side plate 55 of the spring case 50 will be described. Since the pair of side plates 80 is attached to the first side plate portion 55, the vertical length of the first side plate portion 55 is limited. In other words, the size of the first side plate portion 55 is determined in consideration of the minimum strength required to hold the side plate 80, and the like. This reduces the weight of the spring box 50. For example, the first side plate portion 55 is shorter than the second side plate portion 56 in the up-down direction (Z direction in the drawing).

The first side plate 55 is formed with a first recess 64 and a second recess 65 that open downward. Each of the first recess 64 and the second recess 65 is formed in an arc shape that opens downward. The depth of the first concave portion 64 is smaller than the radius of the rubber roller 71c (see fig. 4) of the front roller shaft body 71. The depth of the second recess 65 is smaller than the radius of the rubber roller 61c (see fig. 4) of the intermediate roller shaft body 61. By forming the first concave portion 64 and the second concave portion 65 in the first side plate portion 55 of the mounting side plate 80, the first reinforcing portion 84 and the second reinforcing portion 85 of the side plate 80 are engaged with the first concave portion 64 and the second concave portion 65, respectively, and the mounting stability of the side plate 80 is improved.

The first side plate portion 55 has a first through hole 67 formed corresponding to the first hole 87 of the side plate 80, and a second through hole 66 formed corresponding to the second hole 86. The flat plate portion 80a of the side plate 80 overlaps the rear surface 55b of the first side plate portion 55 (i.e., the inner surface side of the first side plate portion 55) (see fig. 12). The first fixing screw 107 is inserted in a state where the first hole 87 is aligned in a straight line in the axial direction with respect to the first through hole 67. The second fixing screw 106 is inserted in a state where the second hole portion 86 is aligned in a straight line in the axial direction with respect to the second through hole 66. Thereby, the side plate 80 is fixed to the spring box 50. For example, female screws are formed in the first through hole 67 and the second through hole 66. The side plate 80 may be fastened and fixed by screwing the first fixing screw 107 into the first through hole 67 and screwing the second fixing screw 106 into the second through hole 66. The side plate 80 can be easily attached by screwing each of the first fixing screw 107 and the second fixing screw 106 from the outside.

According to the draft device 6 of the present embodiment, the side plate 80 having the first roller shaft accommodating recess 81 and the second roller shaft accommodating recess 82 is detachably attached to the spring box 50 attached to the draft cradle 40. By releasing the fixation of the spring box fixing screw 97, the spring box 50 can be easily removed from the draft cradle 40. By releasing the first fixing screw 107 and the second fixing screw 106, the side plate 80 can be easily removed from the spring box 50. When the side plate 80 is removed, the spring box 50 does not need to be removed from the draft cradle 40. Therefore, the side plate 80 can be easily replaced, and the gauge of the front upper roller 17b and the middle upper roller 16b can be easily changed. The member having the roller shaft accommodating recess (i.e., the side plate 80) that is easily worn out over time can be easily replaced. In the draft device 6, if the pressure applied to the front top roller 17b and the middle top roller 16b (draft rollers) by the spring box 50 is within an effective range, the gauge change can be completed only by replacing the side plates 80 without removing a plurality of members from the draft cradle 40 as in the conventional case.

In particular, in recent years, the number of changes in the type and/or draft ratio of the fiber bundle S drafted by the draft device 6 tends to increase. In order to improve the productivity of the draft device 6 with an increase in the draft speed, the frequency of pitch changes of the front top roller 17b and the middle top roller 16b (draft rollers) with the modification of the draft device 6 is also increased. In order to meet the recent requirements, in the draft device 6 of the present embodiment, the pitch of the front top roller 17b and the middle top roller 16b (draft rollers) can be easily changed. Accordingly, by finely setting the positions of the front top roller 17b and the middle top roller 16b (draft rollers), the draft accuracy of the draft device 6 can be improved.

With the configuration in which the side plate 80 has the first roller shaft accommodating recess 81 and the second roller shaft accommodating recess 82, the distance between the front upper roller 17b and the middle upper roller 16b can be easily changed by replacing the side plate 80.

The first hole 87 for the first fixing screw 107 is formed on the downstream side of the roller axis (first roller axis) of the front upper roller 17b in the draft direction. The second hole 86 for the second fixing screw 106 is formed on the downstream side of the roller axis (second roller axis) of the middle-upper roller 16b in the draft direction. This can avoid the distance between the two holes from being too short or the holes from interfering with each other, and can increase the degree of freedom in the positions of the first hole 87 and the second hole 86.

A first distance between the first hole portion 87 and the first roller axis is shorter than a second distance between the second hole portion 86 and the second roller axis. The positioning of the front top roller 17b when the side plate 80 is attached to the spring box 50 is performed at a position close to the front top roller 17b, whereby the positioning accuracy of the front top roller 17b can be improved.

The side plate 80 includes a first reinforcing portion 84 formed around the first roller shaft accommodating recess 81. The side plate 80 includes a second reinforcing portion 85 formed around the second roller receiving recess 82. Thereby, the strength of the side plate 80 is improved. The front upper roller 17b slides in the rotational direction in contact with the first roller shaft accommodating recess 81, and the upper roller 16b slides in the rotational direction in contact with the second roller shaft accommodating recess 82.

The pair of side plates 80 are disposed symmetrically, and the first reinforcing portion 84 and the second reinforcing portion 85 are disposed to protrude outward. According to this configuration, since the first reinforcing portion 84 and the second reinforcing portion 85 protrude outward on both the left and right sides of the spring box 50, the strength of the side plate 80 can be improved.

Each of the first reinforcing portion 84 and the second reinforcing portion 85 is formed to have an inverted U-shaped protruding portion. The first side plate 55 of the spring box 50 is formed with an arc-shaped first recess 64 and a second recess 65, respectively. According to this configuration, the first reinforcing portion 84 and the first recess 64, and the second reinforcing portion 85 and the second recess 65 can position the side plate 80. Since the contact area between the first reinforcement portion 84 and the first recess 64 and the contact area between the second reinforcement portion 85 and the second recess 65 cover a wider range than the positioning by screws, screw holes, or the like, the positioning of the side plate 80 can be performed with high accuracy.

According to the above embodiment, in the spinning unit 2 (spinning machine 1), the gauge change of the draft roller can be easily performed. Therefore, for example, the time required for the operation associated with the gauge change can be shortened, and therefore, a reduction in productivity of the spinning unit 2 (spinning machine 1) associated with the gauge change can be avoided. Further, as described above, since the draft device 6 can change the gauge finely, the quality of the yarn produced by the spinning unit 2 (spinning machine 1) can be improved.

According to the side plate 80 of the present embodiment, the side plate 80 can be easily removed from the spring box 50. The side plates 80 can be easily replaced, and the distance between the front upper roller 17b and the middle upper roller 16b can be changed. As shown in fig. 11, the first step portion 84s and the second step portion 85s align the peripheral edge portions of the first roller shaft accommodating recess 81 and the second roller shaft accommodating recess 82 with the positions of the first side plate portion 55. That is, the second rib surface 85a coincides with the surface 55a of the first side plate 55, and the second rib rear surface 85b coincides with the rear surface 55b of the first side plate 55, as viewed from below. Although not shown in fig. 12, the first rib front surface 84a also coincides with the front surface 55a of the first side plate portion 55, and the first rib rear surface 84b (see fig. 11) coincides with the rear surface 55b of the first side plate portion 55. When the front top roller 17b and the middle top roller 16b are positioned with reference to the first side plate portion 55, and when the front top roller 17b is positioned with reference to the first roller shaft accommodating recess portion 81 of the side plate 80 and the middle top roller 16b is positioned with reference to the second roller shaft accommodating recess portion 82, the position of the wall surface does not change in the axial direction. Therefore, the axial positioning of the front upper roller 17b and the middle upper roller 16b is also easy.

The strength of the side plate 80 is improved by the first reinforcing portion 84 and the second reinforcing portion 85. The front upper roller 17b slides in the rotational direction in contact with the first roller shaft accommodating recess 81, and the upper roller 16b slides in the rotational direction in contact with the second roller shaft accommodating recess 82.

The first reinforcing portion 84 and the second reinforcing portion 85 formed in a rib shape have the same thickness as the flat plate portion 80a. That is, the reinforcing portion is not formed by a method of increasing the thickness. The front upper roller 17b and the middle upper roller 16b can be firmly supported by the side plates 80. The draft cradle 40 (draft device 6) is not too heavy when the side plate 80, the front top roller 17b, and the middle top roller 16b are attached to the draft device 6. Therefore, the operability is not degraded.

In the side plate 80, the first roller shaft accommodating recess 81 protrudes by 2.4mm to 3.5mm with respect to the flat plate portion 80a that overlaps the first side plate portion 55 of the spring box 50. The second roller shaft accommodating recess 82 projects by 2.4mm to 3.5mm from the flat plate portion 80a that overlaps the first side plate portion 55 of the spring box 50. Therefore, the strength around the first roller shaft accommodating recess 81 and the second roller shaft accommodating recess 82 can be increased without increasing the size of the entire side plate 80.

Since the first reinforcing portion 84 and the second reinforcing portion 85 are each formed in an inverted U shape, the side plate 80 is easily positioned when attached to the spring box 50.

The side plate 80 is formed with a plate-shaped first auxiliary reinforcing portion 88 bent at a right angle. In recent years, the drawing speed (spinning speed) has been remarkably increased. With the increase in the draft speed, particularly the increase in the rotation speed of the front top roller 17b, the stable rotation of the front top roller 17b becomes a problem. If the rotation of the front top roller 17b is unstable, the draft quality (yarn quality) may be reduced. The side plate 80 of the present embodiment contributes to maintaining the performance of the draft device 6 as a member for stably rotating the front top roller 17b. For example, even if the side plate 80 has worn out, the side plate 80 can be easily replaced.

According to the spring box 50 of the present embodiment, the side plate 80 having the first roller shaft accommodating recess 81 and the second roller shaft accommodating recess 82 can be detachably attached to the first side plate portion 55. The side plate 80 can be easily removed from the first side plate portion 55. Therefore, the side plates 80 can be easily replaced, and the gap between the front upper roller 17b and the middle upper roller 16b can be easily changed.

The side plate 80 can be positioned by fitting the protruding portion of the side plate 80 into the first recess 64 and the second recess 65.

The depth of the first recess 64 is smaller than the radius of the front upper roller 17b, and the depth of the second recess 65 is smaller than the radius of the middle upper roller 16b. With this structure, the side plate 80 can be easily fitted into the first side plate portion 55.

While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.

Instead of the above configuration, the air jet spinning device may include a pair of air jet nozzles that twist the fiber bundle in opposite directions to each other.

In the spinning unit 2, the yarn accumulating device 11 has a function of drawing the yarn Y from the air jet spinning device 7, but the yarn Y may be drawn from the air jet spinning device 7 by a feed roller and a pinch roller. When the yarn Y is drawn out from the air jet spinning device 7 by the feed roller and the pinch roller, a slackening tube using a suction air flow, a mechanical compensator, or the like may be provided instead of the yarn accumulating device 11.

A cleaning device for cleaning the top roll may be attached to the draft cradle 40. The front roller shaft 71 may not have a stepped portion as shown in fig. 6, but may be a roller having a constant outer diameter.

In the above embodiment, each device is arranged such that the yarn Y supplied on the upper side is wound on the lower side in the machine height direction. However, each device may be arranged so that the yarn fed below is wound up above.

In the above embodiment, the draft device 6 has been described as an example of a configuration including the rear roller pair 14, the third roller pair 15, the intermediate roller pair 16, and the front roller pair 17. However, one or more roller pairs may be provided upstream of the rear roller pair 14. In this case, the draft cradle 40 supports, for example, the upper rollers of all the roller pairs including the roller pair on the upstream side.

In the above embodiment, a configuration in which at least one of the lower rollers of the draft device 6 and the traverse guide 23 are driven by power from the second end frame 5 (that is, common to a plurality of spinning units 2) has been described as an example. However, each part (for example, a draft device, a spinning device, a winding device, and the like) of the spinning unit 2 may be independently driven in units of the spinning unit 2.

In the above embodiment, the configuration in which the air jet spinning device 7 continuously spins the yarn Y at a constant speed has been described as an example. However, the speed at which the air jet spinning device 7 continuously spins the yarn Y may not be constant.

In the above embodiment, a mode in which two yarn ends are connected by the yarn splicing device 26 has been described as an example. However, instead of the configuration in which the yarn ends are connected by the yarn splicing device 26, the yarn Y from the package P may be inserted into the air jet spinning device 7, and the yarn Y from the air jet spinning device 7 and the yarn Y from the package P may be connected (spliced) by starting the draft operation of the draft device 6 and the spinning operation of the air jet spinning device 7. In any case, the yarn splicing cart 3 may be omitted, and each spinning unit 2 may include a device necessary for yarn splicing.

In the above embodiment, the description has been given taking the form in which the tension sensor 9 is disposed downstream of the yarn monitoring device 8 in the traveling direction of the yarn Y as an example. However, the tension sensor 9 may be disposed upstream of the yarn monitoring device 8. The unit controller 10 may be provided in units of one spinning unit 2. In the spinning unit 2, the waxing device 12, the tension sensor 9, and the yarn monitoring device 8 may be omitted. In the case where the yarn Y is not waxed, only the wax may be removed from the waxing device 12 without omitting the waxing device 12.

In fig. 1, the spinning machine 1 is illustrated as winding a package P in a bobbin shape (a cone shape 124811254074. In the case of a package having a pyramidal shape, although the yarn Y is loosened by the traverse of the yarn Y, the looseness can be absorbed by the yarn accumulating device 11. The material and shape of each structure are not limited to the above-described material and shape, and various materials and shapes can be used.

In the above embodiment, the description has been given taking the form in which the two draft rollers (the front top roller 17b and the middle top roller 16 b) are supported by the spring box and the side plates as an example. However, the spring box and the side plate may support only one draft roller. In this case, only the front top roller 17b may be supported by the box spring and the side plates.

The reinforcing portion of the side plate is not limited to the rib-like shape protruding from the flat plate portion, and may be formed by increasing the plate thickness of the side plate. The reinforcing portion of the side plate may be formed of a member (other member) different from the flat plate portion.

In the above embodiment, the description has been given taking a form in which the pair of side plates are bilaterally symmetrical as an example. However, a pair of side plates having the same shape may be used instead of being symmetrical to each other. In this case, the number of parts can be reduced by using common parts as the left and right side plates. In addition, when the side panel is made common, the side panel is preferably not divided into front and rear.

In the above embodiment, the first concave portion 64 and the second concave portion 65 having the circular arc shapes are formed in the first side plate portion 55 of the spring case 50 as an example. However, the depth of the first recess 64 may be larger than the radius of the rubber roller 71c of the front upper roller 17b, and/or the depth of the second recess 65 may be larger than the radius of the rubber roller of the middle upper roller 16b. The first concave portion 64 and the second concave portion 65 may be formed in an inverted U shape including parallel edge portions continuous with the circular arc. In this case, the first reinforcing portion 84 is fitted into the first recess 64, and the second reinforcing portion 85 is fitted into the second recess 65.

The step portion is not limited to the form of the reinforcing portion formed in the inverted U shape, and may be formed linearly along the lower edge (parallel to the lower end) of the side plate portion and protrude from the flat plate portion. In this case, the stepped portion may be formed in a rib shape having a straight line.

In the embodiment in which the side plates support the two draft rollers arranged adjacent to each other in the draft direction, the auxiliary reinforcing portion may be formed only above the second roller shaft accommodating recess, or may be formed over the first roller shaft accommodating recess and the second roller shaft accommodating recess.

Claims

1. A draft device for drafting a fiber bundle, comprising:

drawing a cradle;

a spring box mounted on the draft cradle;

a first fixing portion for fixing the spring box to the draft cradle;

a pair of side plates detachably attached to the spring box and each having at least one roller shaft accommodating recess;

a second fixing portion for fixing the side plate to the spring box; and

and at least one draft roller configured to pass through the roller shaft accommodating recess.

2. Drafting device as in claim 1,

the draft roller includes a front top roller and an intermediate top roller disposed upstream of the front top roller in a draft direction,

a first roller shaft accommodating recess and a second roller shaft accommodating recess, which are two roller shaft accommodating recesses, are formed in each of the side plates,

the front top roller is configured in a way of passing through the first roller shaft accommodating concave part,

the middle upper roll is disposed to pass through the second roll shaft accommodating recess.

3. Drafting device as in claim 2,

on the above side plate

A first hole portion for the second fixing portion is formed downstream of the first roller axis of the first roller shaft accommodating recess portion in the draft direction,

a second hole portion for the second fixing portion is formed downstream of the second roll axis accommodating recess in the draft direction.

4. Drafting device as in claim 3,

a first distance between the first hole and the first roller axis is shorter than a second distance between the second hole and the second roller axis.

5. A drafting device as claimed in any one of claims 1 to 4,

the side plate includes a reinforcing portion formed around the roller shaft accommodating recess.

6. Drafting device as in claim 5,

the pair of side plates are arranged in a left-right symmetry,

in the case where the side opposite to the side opposed to the pair of side plates is defined as the outer side,

the reinforcing portion is formed on each of the pair of side plates so as to protrude outward.

7. Drafting device as in claim 5,

the reinforcing portion of the side plate is formed to have an inverted U-shaped protruding portion,

the spring box has a pair of side supporting parts for mounting the side plate,

an arc-shaped or inverted U-shaped recess is formed in each of the side support portions.

8. Drafting device as in claim 6,

the spring box has a pair of side supporting parts for mounting the side plate,

each of the side support portions is formed with an arc-shaped or inverted U-shaped recess.

9. An air jet spinning machine is characterized by comprising:

a drawing device as claimed in any one of claims 1 to 8;

an air jet spinning device disposed downstream of the draft device in the draft direction; and

and a winding device disposed downstream of the air jet spinning device.

10. A side plate for a draft device, which is attached to a spring box of the draft device, is provided with:

a plate-shaped main body portion fixed to the side plate portion of the spring case,

the main body has at least one roller shaft accommodating recess and a step portion for aligning the axial position of the peripheral edge of the roller shaft accommodating recess with the position of the side plate.

11. The side plate for a draft device according to claim 10,

the peripheral edge of the roller shaft accommodating recess constitutes a reinforcing portion of the main body.

12. The side plate for a draft device according to claim 11,

the main body portion has a flat plate portion overlapping the side plate portion of the spring box,

the reinforcing portion is formed in a rib shape protruding from the flat plate portion.

13. The side plate for a draft device according to claim 11 or 12,

the reinforcing portion protrudes by 2.4mm to 3.5mm from the flat plate portion overlapping the side plate portion of the spring box.

14. The side plate for a draft device according to claim 11 or 12,

the reinforcing part is formed in an inverted U shape.

15. The side plate for a draft device according to claim 13,

the reinforcing part is formed in an inverted U shape.

16. A side plate for a drafting device as claimed in claim 11, 12 or 15,

a first roller shaft accommodating recess and a second roller shaft accommodating recess are formed in the main body as the two roller shaft accommodating recesses,

a plate-shaped auxiliary reinforcing portion bent at a right angle to the main body portion is formed only above one of the first roller shaft accommodating recess portion and the second roller shaft accommodating recess portion.

17. The side plate for a draft device according to claim 13,

18. The side plate for a draft device according to claim 14,

19. A side plate for a draft device, which is attached to a spring box of the draft device, is provided with:

a plate-shaped main body portion fixed to the side plate portion of the spring box;

the main body includes at least one roller shaft accommodating recess and a reinforcing portion formed around the roller shaft accommodating recess.

20. The side plate for a draft device according to claim 19,

21. The side plate for a draft device according to claim 19 or 20,

22. The side plate for a draft device according to claim 19 or 20,

the reinforcing part is formed in an inverted U shape.

23. The side plate for a draft device according to claim 21,

the reinforcing part is formed in an inverted U shape.

24. The side plate for a draft device according to claim 19, 20 or 23,

25. The side plate for a draft device according to claim 21,

26. The side plate for a draft device according to claim 22,

27. A spring box for a draft device, comprising:

a main body portion; and

a biasing portion attached to the main body portion,

the main body part includes:

a planar portion to which the biasing portion is attached and which extends in a draft direction and an axial direction orthogonal to the draft direction;

a pair of first side plate portions provided at both ends of the planar portion in the axial direction; and

a pair of second side plate portions provided at both ends of the planar portion in the draft direction,

the first side plate portion is shorter than the second side plate portion in a vertical direction orthogonal to both the draft direction and the axial direction.

28. The spring box for a drawing frame according to claim 27,

the first side plate portion is formed with an arc-shaped or inverted U-shaped recess opening in a direction away from the flat surface portion.

29. The spring box for a drawing frame according to claim 28,

the depth of the recess is smaller than the radius of the draft roller supported by the main body.