Friction shaft for splitting machine

Abstract

The present invention relates to a friction shaft for a slitter, which is provided with a winding pipe on the outer surface thereof, the winding pipe winding unit materials formed by cutting various raw materials such as paper, cloth or film at predetermined intervals in a reel form, and the rotating shaft comprises: a first main body part constituting a main body; a plurality of main flow paths that pass through the first main body in the longitudinal direction and have different lengths from each other; and a plurality of sub-flow paths that communicate the plurality of main flow paths and the outside of the first main body part with each other.

Description

Technical Field

[0001] The present invention relates to a friction shaft, and more particularly, to a friction shaft for a slitter having a winding tube disposed on the outside, the winding tube winding unit materials formed by cutting various raw materials such as paper, fabric, or film at a predetermined interval in the form of a reel. Background Art

[0002] A so-called "Slitter" is a device that unwinds raw materials wound in the form of a roll such as fabric, paper, or synthetic resin film and cuts them in the length direction.

[0003] The raw materials are wound and supplied in the form of a reel in a state where they are cut into a plurality of unit materials having a small width by a slitter.

[0004] When using a slitter, it is necessary to individually wind the cut unit materials on the outer surface of a matching winding tube, so it is difficult to wind all the unit materials with a uniform torque using a single rotating shaft.

[0005] If all the unit materials are wound using a single rotating shaft, the unit materials wound on the winding tube will be unevenly wound, some being wound loosely and some being wound too tightly.

[0006] Therefore, the former may have a problem of the reel coming off during the supply process or use process, and the latter has problems of the unit material breaking or stretching.

[0007] If expensive film stretches, its marketability may be lost, resulting in a large loss.

[0008] Therefore, a winding device for winding all unit materials with a uniform torque is being provided.

[0009] Among them, the key shaft component is generally referred to as a "Friction Shaft", and since it generally uses air pressure, it is also called an "Air Friction Shaft".

[0010] In this regard, domestic patent publication No. 10-2014-0083406 (July 4, 2014) provides a friction shaft for a slitting machine, including: a rod-shaped winding shaft, which is rotated by a winding motor; a first hole, which is arranged inside the winding shaft along the length direction of the winding shaft through perforation; a plurality of third holes, which are elements that can pass from the outer circumference of the winding shaft to the first hole and are arranged through perforation, and are arranged at intervals along the extension direction of the first hole; a plurality of clamps, which are elements inserted into the inner circumference of a paper tube for winding unit materials, are in the shape of short tubes that are sequentially inserted into the outer circumference of the winding shaft, and are arranged at each position equipped with a third hole; a first air pressure generating unit, which supplies compressed air to the first hole so that the clamp applies pressure to the paper tube. The clamp includes: a clamp base, which is in the form of a short tube and is equipped with a plurality of clip placement grooves along the outer circumference, and a connecting hole that clears the third hole and the clip placement groove is equipped by perforation; a clip, which is inserted into the clip placement groove to ensure that it can run along the radial direction of the winding shaft; a spring, one end of which is supported by the clip and the other end is supported by the clip placement groove, so that the clip receives the force that attempts to protrude under the action of elastic force along the radial direction of the winding shaft; a fixed cover, which squeezes the outer side edge of the clip and is fixed on the clamp base to ensure that the clip will not separate from the clip placement groove; a pneumatic guide device, which plays a guiding role to ensure that the compressed air supplied to the first hole squeezes the clip toward the center of the winding shaft.

[0011] The air pressure generated by the air compressor of the friction shaft flows into the interior of the winding shaft from the air pressure generating portion connected to one end of the winding shaft.

[0012] In addition, the air pressure flowing in from one end of the winding shaft causes a plurality of clips arranged in the longitudinal direction of the winding shaft to protrude from the outer peripheral surface of the winding shaft.

[0013] In addition, in this conventional friction shaft, air flows in from one end of the winding shaft.

[0014] In this case, even if air of the same pressure is supplied to each clamp from one end of the winding shaft, there may be a problem of torque deviation in each clamp due to various reasons such as assembly tolerance of the retainer, bearing and other components that constitute the friction shaft, surface roughness, heat generated during product operation, wear, foreign matter entrapment, etc.

[0015] Therefore, according to the prior art, there is a problem that the unit material wound on the winding tube is wound unevenly.

[0016] Therefore, some are wound loosely, while others are wound too tightly. The former may cause the reel to loosen during the supply process or use, while the latter may cause the unit material to break or stretch.

[0017] For the above reasons, although the industry has been exploring solutions that can evenly wind the unit material around the winding tube, no satisfactory results have been obtained so far. Summary of the Invention

[0018] Technical Problem to be Solved

[0019] To solve the above problems, the present invention provides a friction shaft for a slitter that can evenly wind the unit material around the winding tube.

[0020] The above objects and other objects, advantages and features of the present invention, and the methods for achieving them will be more clearly understood by referring to the accompanying drawings and the detailed embodiments described later.

[0021] Method for Solving the Technical Problem

[0022] To achieve the above object, a friction shaft for a slitter according to an embodiment of the present invention, which has a winding tube on the outside for winding unit materials formed by cutting various raw materials such as paper, fabric, or film at a predetermined interval in a reel form, includes: a rotating shaft that rotates through a driving motor and supplies compressed air from an air supply unit; a plurality of friction cores that are in the shape of short tubes and are arranged side by side on the rotating shaft; a clip portion that is installed on the friction core, and a plurality of clip portions are arranged at equal intervals in the axial direction of the rotating shaft on the friction core; and a rotary joint that is coupled to an end of the rotating shaft and supplies the air supplied from the air supply unit to the rotating shaft. The rotating shaft includes: a first main body portion that constitutes the main body; a plurality of main flow paths that penetrate along the length direction from the first main body portion and have different lengths from each other; and a plurality of sub-flow paths that communicate the plurality of main flow paths with the outside of the first main body portion.

[0023] The friction core includes: a second main body portion that constitutes the main body; a through hole that penetrates in the radial direction from the second main body portion, and the clip portion is inserted therein; a plurality of placement holes that are arranged at equal intervals in the circumferential direction of the rotating shaft at positions on the second main body portion that do not overlap with the through hole; and a plurality of roller portions that are placed in the placement holes.

[0024] The friction core further includes: a retainer bracket that is arranged side by side on the rotating shaft; and a retainer that is supported by the retainer bracket and generates torque by the air pressure flowing in from the outside.

[0025] The plurality of friction cores are composed of the following parts: 4 first cores disposed at one end where the rotary joint is coupled, i.e., the first region; 4 second cores disposed at a position close to the first region in a region opposite to the rotary joint coupling position with respect to the first region, i.e., the second region; 4 third cores disposed at a position close to the second region in a region opposite to the rotary joint coupling position with respect to the second region, i.e., the third region; and 4 fourth cores disposed at a position close to the third region in a region opposite to the rotary joint coupling position with respect to the third region, i.e., the fourth region.

[0026] The plurality of friction cores are sequentially mounted on the first main body portion.

[0027] The main flow path includes: a first main flow path that penetrates from one end where the rotary joint is coupled to the first region; a second main flow path that does not overlap with the first main flow path and penetrates from one end where the rotary joint is coupled to the second region; a third main flow path that does not overlap with the first main flow path and the second main flow path and penetrates from one end where the rotary joint is coupled to the third region; and a fourth main flow path that does not overlap with the first main flow path to the third main flow path and penetrates from one end where the rotary joint is coupled to the fourth region.

[0028] The sub-flow path includes: a first sub-flow path formed in the first region on the first main flow path; a second sub-flow path formed in the second region on the second main flow path; a third sub-flow path formed in the third region on the third main flow path; and a fourth sub-flow path formed in the fourth region on the fourth main flow path.

[0029] The rotary shaft further includes: a plurality of grooves (GROOVE) formed along the length direction on the outer peripheral surface of the first main body portion and communicating with the sub-flow path.

[0030] The grooves are respectively formed on the first sub-flow path, the second sub-flow path, the third sub-flow path, and the fourth sub-flow path.

[0031] The chucking portion includes: an upper chucking piece that, when compressed air flows in from the air supply portion, has its upper surface contact the inner peripheral surface of the winding tube and clamps the winding tube (chucking); a connecting portion that extends downward from the lower surface of the upper chucking piece; a lower chucking piece having a placement portion formed on its upper surface and extending from both ends in the circumferential direction of the rotary shaft at the lower end of the connecting portion; and an elastic member having one end placed on the placement portion and the other end contacting the inner peripheral surface of the second main body portion.

[0032] The elastic member is a compression spring.

[0033] The friction shaft for a slitter according to claim 6, wherein the rotary joint includes: a third main body portion that constitutes the main body; a first connection hole that penetrates one end and the other end of the third main body portion and communicates with the first main flow path; a second connection hole that penetrates one end and the other end of the third main body portion and communicates with the second main flow path; a third connection hole that penetrates one end and the other end of the third main body portion and communicates with the third main flow path; and a fourth connection hole that penetrates one end and the other end of the third main body portion and communicates with the fourth main flow path.

[0034] Advantages of the Invention

[0035] According to the present invention, the main flow paths composed of multiple parts are respectively connected to multiple friction cores provided in multiple regions, and different air pressures flow into the multiple friction cores respectively. Thus, the torques generated by the air pressures are respectively applied to the multiple friction cores, so that the torque deviation of each of the multiple friction cores can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a perspective view showing a friction shaft for a slitter according to an embodiment of the present invention.

[0037] Figure 2 is a cross-sectional view of a friction shaft for a slitter according to an embodiment of the present invention.

[0038] Figure 3 is a cross-sectional view of a friction shaft for a slitter according to another embodiment of the present invention.

[0039] Figure 4 is a perspective view showing a rotating shaft and a rotary joint of a friction shaft for a slitter according to an embodiment of the present invention.

[0040] Figure 5 is along Figure 4 a cross-sectional view taken along the line A-A' shown.

[0041] Figure 6 is along Figure 4 a cross-sectional view taken along the line B-B' shown.

[0042] Figure 7 is a perspective view showing a clip portion of a friction shaft for a slitter according to an embodiment of the present invention.

[0043] Figure 8 is to Figure 2 an enlarged view of the enlarged 'A' portion shown.

[0044] Figure 9a and Figure 9b is an operation diagram of a friction shaft for a slitter according to an embodiment of the present invention.

[0045] Figure 10 is a perspective view showing a rotating shaft according to another embodiment of the present invention.

[0046] Figure 11 is Figure 10 a sectional view taken along the C-C' line shown.

[0047] Figure 12 is Figure 10 a sectional view taken along the D-D' line shown. DETAILED DESCRIPTION

[0048] Embodiments of the present invention are provided to more completely describe the present invention to those skilled in the art of the present technology. The following embodiments can be deformed in various different forms, and the scope of the present invention is not limited to the following embodiments. On the contrary, these embodiments are provided to make the present invention more substantial and complete, and to completely convey the idea of the present invention to those skilled in the art. In addition, for the convenience and clarity of the description, each component in the following drawings is exaggeratedly described. The same symbols in the drawings represent the same elements. As used in this specification, the term "and / or" includes any one and all combinations of more than one of the listed items.

[0049] The terms used in this specification are used to describe specific embodiments and do not limit the present invention.

[0050] As used in this specification, unless the context clearly indicates otherwise, the singular form may include the plural form. In addition, if used in this specification, "comprise" and / or "comprising" specifically specify the existence of the mentioned shape, number, step, action, component, element, and / or group thereof, and do not exclude the existence or addition of one or more other shapes, numbers, actions, components, elements, and / or groups.

[0051] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0052] Figure 1 is a perspective view showing a friction shaft for a slitter according to an embodiment of the present invention, Figure 2 is a sectional view of a friction shaft for a slitter according to an embodiment of the present invention, Figure 3 is a sectional view of a friction shaft for a slitter according to another embodiment of the present invention, Figure 4 is a perspective view showing a rotating shaft and a rotary joint of a friction shaft for a slitter according to an embodiment of the present invention, Figure 5 is Figure 4 a sectional view taken along the A-A' line shown, Figure 6 is Figure 4Cross-sectional view taken along line B-B' as shown Figure 7 is a perspective view showing a chucking part of a friction shaft for a slitter according to an embodiment of the present invention Figure 8 is to Figure 2 an enlarged view obtained by enlarging the part 'A' shown Figure 9a and Figure 9b is an operation diagram of a friction shaft for a slitter according to an embodiment of the present invention Figure 10 is a perspective view showing a rotating shaft according to another embodiment of the present invention Figure 11 is along Figure 10 cross-sectional view taken along line C-C' as shown Figure 12 is along Figure 10 cross-sectional view taken along line D-D' as shown

[0053] Referring to Figures 1 to 12 it can be seen that according to an embodiment of the present invention, a friction shaft having a winding tube on the outside for winding unit materials formed by cutting various raw materials such as paper, fabric, or film at a predetermined interval in a roll form includes: a rotating shaft 100; a friction core 200 mounted on the rotating shaft 100; a chucking (lug) part 300 mounted on the friction core 200 for selectively chucking the winding tube; and a rotary joint 400 coupled to one end of the rotating shaft 100

[0054] In addition, the winding tube may be composed of a paper tube or an FRP core, etc

[0055] The rotating shaft 100 is rotated by a driving motor, and compressed air is supplied from an air supply unit 500

[0056] Such a rotating shaft 100 includes a first main body part 110, a main flow path 120, and a sub-flow path 130

[0057] The first main body part 110 constitutes the main body of the rotating shaft 100

[0058] The main flow path 120 penetrates through the first main body part 110 in the longitudinal direction and is composed of a plurality of parts having different lengths

[0059] In addition, the compressed air supplied from the air supply unit 500 is selectively moved in the main flow path 120

[0060] The sub-flow path 130 is composed of a plurality corresponding to the plurality of main flow paths 120 and communicates with the outside of the first main body part 110

[0061] That is, the sub-flow path 130 supplies the compressed air supplied from the air supply unit 500 to the friction core 200

[0062] The friction core 200 is in the shape of a short tube and is composed of multiple parts, which are arranged side by side on the rotating shaft 100 at a predetermined interval along the length direction.

[0063] In addition, a winding tube is installed on the outer peripheral surface of the friction core 200.

[0064] Such a friction core 200 includes a second main body portion 210, a through hole 220, a placement hole 230, a roller portion 240, a retainer ring bracket 250, and a retainer ring 260.

[0065] The second main body portion 210 constitutes the main body of the friction core 200 and is in the shape of a short tube.

[0066] A plurality of through holes 220 are formed, and they are spaced apart from each other at equal intervals along the circumferential direction of the second main body portion 210.

[0067] In addition, the through holes 220 penetrate the second main body portion 210 in the radial direction, and the clamping piece portion 300 is inserted therein.

[0068] Such through holes 220 communicate the outside and the inside of the friction core 200 with each other.

[0069] In addition, the through holes 220 are configured in a T-shape with a wider upper part and a narrower lower part in cross-section.

[0070] A plurality of placement holes 230 are formed, and a plurality of them are formed on the second main body portion 210 along the length direction of the rotating shaft 100 and are spaced apart from each other at equal intervals along the circumferential direction of the second main body portion 210.

[0071] Such placement holes 230 are provided in the region of the second main body portion 210 that does not overlap with the plurality of through holes 220, that is, between the plurality of through holes 220.

[0072] A plurality of roller portions 240 corresponding to the placement holes 230 are provided, and they are respectively placed in the plurality of placement holes 230.

[0073] In addition, the inner peripheral surface of the winding tube is in contact with the outermost side of the roller portion 240.

[0074] That is, in a state where the clamping piece portion 300 does not clamp the winding tube, the roller portion 240 can make the winding tube move easily from the friction core 200.

[0075] Therefore, in a state where the clamping piece portion 300 does not clamp the winding tube, when adjusting the position of the winding tube on the friction core 200, the roller portion 240 rotates together with the winding tube, and at the same time, it can easily move the heavy winding tube, so that its position can be adjusted.

[0076] Preferably, the retainer brackets 250 are formed in a ring shape and are arranged in a pair, respectively disposed at one end and the other end of the second main body portion 210.

[0077] In addition, the outer peripheral surface of the retainer bracket 250 is joined to the inner peripheral surface of the second main body portion 210, and the inner peripheral surface is joined to the retainer 260.

[0078] The retainers 260 are arranged in a pair and are disposed on the inner peripheral surface of the retainer bracket 250 along the left - right direction of the clip portion 300.

[0079] The outer peripheral surface of the retainer 260 is in contact with the inner peripheral surface of the retainer bracket 250, and the inner peripheral surface is in contact with the outer peripheral surface of the first main body portion 110.

[0080] Such a retainer 260 is made of an elastic material such as silicone or polyurethane, and grooves are formed in opposite directions.

[0081] Therefore, if air pressure is injected from the outside of the retainer 260, under the action of the air pressure, the grooves of the retainer 260 will undergo elastic deformation, the outer peripheral surface of the retainer 260 presses against the inner peripheral surface of the retainer bracket 250, and the inner peripheral surface presses against the outer peripheral surface of the first main body portion 110.

[0082] Due to such a structure, when the rotating shaft 100 rotates, the retainer 260 can effectively transmit torque to the friction core 200.

[0083] In addition, a plurality of friction cores 200 made of the above - mentioned structure may be composed of a first core 200_1, a second core 200_2, a third core 200_3, and a fourth core 200_4.

[0084] As Figure 2 shown, the first core 200_1 means that 4 friction cores 200 among the plurality of friction cores 200 are arranged at one end where the rotary joint 400 is joined, that is, the first region A1, and the second core 200_2 means that another 4 friction cores 200 among the plurality of friction cores 200 are arranged in a position close to the first region A1 in the region opposite to the joining position of the rotary joint 400 with respect to the first region A1, that is, the second region A2.

[0085] In addition, the third core 200_3 means that another 4 friction cores 200 among the plurality of friction cores 200 are arranged in a position close to the second region A2 in the region opposite to the joining position of the rotary joint 400 with respect to the second region A2, that is, the third region A3, and the fourth core 200_4 means that another 4 friction cores 200 among the plurality of friction cores 200 are arranged in a position close to the third region A3 in the region opposite to the joining position of the rotary joint 400 with respect to the third region A3, that is, the fourth region A4.

[0086] In addition, in the present invention, for the convenience of description, the friction shaft of the slitter of the present invention is introduced by dividing it into the first region A1 to the fourth region A4. However, as Figure 3 shown, depending on the usage environment of the present invention, the friction shaft of the slitter of the present invention can be divided into at least the second region and above, that is, the first region A1 to the nth region An. Therefore, the friction core 200 also corresponds thereto and can be composed of the first core 200_1 and the second core 200_2 or the first core 200_1 to the nth core 200_n.

[0087] Such a plurality of friction cores 200, that is, the first core 200_1, the second core 200_2, the third core 200_3, and the fourth core 200_4, are sequentially inserted into the first main body portion 110 along the axial direction.

[0088] Therefore, the clip portion 300 inserted into the through hole 220 of the second main body portion 210 is in contact with a plurality of positions on the inner peripheral surface of the winding tube, so that the winding tube can be stably clamped.

[0089] In addition, the main flow paths 120 having different lengths from each other include a first main flow path 121, a second main flow path 122, a third main flow path 123, and a fourth main flow path 124.

[0090] The first main flow path 121 penetrates through the first main body portion 110 from one end where the rotary joint 400 is coupled to the first region A1, and the second main flow path 122 does not overlap with the first main flow path 121 on the first main body portion 110 and penetrates through from one end where the rotary joint 400 is coupled to the second region A2.

[0091] In addition, the third main flow path 123 does not overlap with the first main flow path 121 and the second main flow path 122 on the first main body portion 110 and penetrates through from one end where the rotary joint 400 is coupled to the third region A3, and the fourth main flow path 124 does not overlap with the first main flow path 121 to the third main flow path 123 and penetrates through from one end where the rotary joint 400 is coupled to the fourth region A4.

[0092] In addition, the sub-flow paths 130 formed at the ends of the main flow paths 120 are composed of a first sub-flow path 131, a second sub-flow path 132, a third sub-flow path 133, and a fourth sub-flow path 134 according to the formation positions in the first main flow path 121 to the fourth main flow path 124.

[0093] The first sub-flow path 131 is formed in the first region A1 on the first main flow path 121 penetrating through the first region A1, and the second sub-flow path 132 is formed in the second region A2 on the second main flow path 122 penetrating through the second region A2.

[0094] In addition, the third sub-flow path 133 is formed in the third region A3 on the third main flow path 123 that penetrates to the third region A3, and the fourth sub-flow path 134 is formed in the fourth region A4 on the fourth main flow path 124 that penetrates to the fourth region A4.

[0095] Such multiple sub-flow paths 130 are respectively formed at positions corresponding to the multiple friction cores 200.

[0096] That is, the present invention can supply compressed air with different pressures through the multiple main flow paths 120 and sub-flow paths 130.

[0097] Therefore, compressed air with different pressures is respectively supplied to the friction cores 200 inserted into the first region A1 to the fourth region A4 through the multiple main flow paths 120 and sub-flow paths 130, and thus the torques generated by air pressure are respectively applied to the multiple friction cores 200.

[0098] That is, it is possible to reduce the deviation of the torque caused by various reasons such as assembly tolerances, surface roughness, heat generation, wear, and foreign object entrapment between the components constituting the friction shaft.

[0099] Therefore, a certain torque is generated on each friction core where the winding tube is installed, so that the fabric wound on the winding tube can be stably wound.

[0100] In addition, the present invention supplies compressed air with different pressures to the first core 200_1 to the fourth core 200_4 or supplies compressed air only to the necessary regions among the first core 200_1 to the fourth core 200_4, reducing the deviation of the torque applied to the multiple arranged friction cores 200, and thus can have versatility according to the usage environment of the present invention.

[0101] The clip portions 300 clamp the winding tube, and a plurality of them are arranged at equal intervals along the circumferential direction of the rotating shaft 100 on the friction core 200, and they are installed on the friction core 200 in a manner that can slide in the radial direction.

[0102] Specifically, the clip portions 300 are respectively inserted into a plurality of through holes 220 formed along the circumferential direction of the second main body portion 210.

[0103] That is, the clip portions 300 are inserted into the through holes 220 that penetrate the outer peripheral surface and the inner peripheral surface of the second main body portion 210, so that they can slide along with the compressed air supplied from the sub-flow path 130.

[0104] Such clip portions 300 include an upper clip 310, a connecting portion 320, a lower clip 330, and an elastic member 340.

[0105] The upper surface of the upper clamping piece 310 is exposed to the outside. If compressed air flows in from the air supply unit 500, the upper surface will engage with the inner circumferential surface of the winding tube.

[0106] That is, if compressed air flows in, the upper clamping piece 310 will clamp the winding tube.

[0107] The connecting part 320 extends downward from the lower surface of the upper clamping piece 310, and its width is narrower than the width in the longitudinal direction of the rotating shaft 100.

[0108] The lower clamping piece 330 extends from the lower end of the connecting part 320 toward both ends in the circumferential direction of the rotating shaft 100, and placement parts 331 are formed on the upper surfaces on both sides with the connecting part 320 as the center.

[0109] That is, the lower clamping piece 330 is blocked by the second main body part 210.

[0110] Therefore, when the lower clamping piece 330 is pressurized through the auxiliary flow path 130, it can effectively prevent detachment from the through hole to the outside.

[0111] Preferably, the elastic member 340 is composed of a compression spring and is placed on the placement part 331 of the clamping piece part 300.

[0112] In addition, if the air pressure supplied to the auxiliary flow path 130 stops being supplied, the elastic member 340 can reset the clamping piece part 300 toward the rotating shaft 100.

[0113] For this purpose, one end of the elastic member 340 is placed on the placement part 331, and the other end engages with the inner circumferential surface of the second main body part 210.

[0114] Therefore, the elastic member 340 provides elastic support for the lower clamping piece 330, and after the air pressure supplied to the auxiliary flow path 130 stops being supplied, it can elastically reset the clamping piece part 300 toward the rotating shaft 100.

[0115] The rotary joint 400 is combined with any one of the two ends of the rotating shaft 100 to supply the air supplied from the air supply unit 500 to the main flow path of the rotating shaft 100.

[0116] Such a rotary joint 400 includes a third main body part 410, a first connection hole 420, a second connection hole 430, a third connection hole 440, and a fourth connection hole 450.

[0117] The third main body part 410 constitutes the main body of the rotary joint 400.

[0118] The first connection hole 420 penetrates through one end and the other end of the third main body portion 410 and is communicated with the first main flow path 121. The second connection hole 430 penetrates through one end and the other end of a region on the third main body portion 410 that does not overlap with the first connection hole 420 and is communicated with the second main flow path 122.

[0119] In addition, the third connection hole 440 penetrates through one end and the other end of a region on the third main body portion 410 that does not overlap with the first connection hole 420 and the second connection hole 430 and is communicated with the third main flow path 123. The fourth connection hole 450 penetrates through one end and the other end of a region on the third main body portion 410 that does not overlap with the first connection hole 420 to the third connection hole 440 and is communicated with the fourth main flow path 124.

[0120] Connection pipes capable of receiving compressed air from the air supply portion 500 are respectively connected to the first connection hole 420 to the fourth connection hole 450.

[0121] Therefore, the first connection hole 420 to the fourth connection hole 450 can respectively receive compressed air with different pressures from the air supply portion 500 as needed.

[0122] Therefore, the first connection hole 420 to the fourth connection hole 450 respectively supply compressed air with different pressures to the plurality of main flow paths 120 and the sub-flow paths 130, so that the torque deviation of the first core 200_1 to the fourth core 200_4 respectively applicable to the first region A1 to the fourth region A4 can be effectively reduced.

[0123] For example: If the torque of the second core 200_2 among the first core 200_1 to the fourth core 200_4 is low, selectively supply a larger air pressure to the second core 200_2 than the other cores 200_1, 200_3, 200_4, so that a larger torque is generated in the retainer 260 of the second core 200_2. If the torque of the fourth core 200_4 among the first core 200_1 to the fourth core 200_4 is high, selectively supply a smaller air pressure to the fourth core 200_4 than the other cores 200_1, 200_2, 200_3, so that a smaller torque is generated in the retainer 260 of the fourth core 200_4.

[0124] Therefore, the torque deviation between the first core 200_1 to the fourth core 200_4 arranged in the first region A1 to the fourth region A4 can be reduced.

[0125] In addition, the rotating shaft 100 according to another embodiment of the present invention further includes a groove (GROOVE) 140.

[0126] A plurality of grooves 140 are formed on the outer peripheral surface of the first main body portion 110 along the length direction of the rotating shaft 100 and are respectively communicated with the plurality of sub-flow paths 130.

[0127] Specifically, grooves 140 are respectively formed on the first secondary flow path 131, the second secondary flow path 132, the third secondary flow path 133, and the fourth secondary flow path 134.

[0128] Therefore, for example, the grooves 140 can supply a uniform pressure of compressed air to the clip portions 300 inserted into the four friction cores 200 constituting the first core 200_1.

[0129] As described above, the embodiments disclosed in this specification should be considered from an exemplary perspective for illustration rather than from a restrictive perspective. The scope of the present invention is not limited to the above description, but is shown in the claims, and all differences within the same scope should be construed as being included in the present invention.

Claims

1. A friction shaft for a slitting machine, characterized in that: The friction shaft for the slitting machine is provided with a winding tube on the outside for winding unit materials such as various papers, cloths or films cut at predetermined intervals in a reel form. The friction shaft for the slitting machine: a rotating shaft, which is rotated by a drive motor and receives compressed air from an air supply; A plurality of friction cores in the shape of short tubes, mounted side by side on the rotating shaft; A plurality of clip parts are provided on the friction core at equal intervals along the axial direction of the rotating shaft and are mounted on the friction core; as well as a rotary joint connected to the end of the rotary shaft to supply air supplied from an air supply unit to the rotary shaft, The rotating shaft comprises: The first main body part, which constitutes the main body; a plurality of main channels extending from the first main body along the length direction and having different lengths; and A plurality of secondary flow paths connect the plurality of primary flow paths and the outside of the first main body portion to each other.

2. The friction shaft for a slitting machine according to claim 1, characterized in that: The friction core comprises: A second main body portion, which constitutes the main body; a through hole extending radially from the second main body portion, into which the clip portion is inserted; a plurality of placement holes, which are provided on the second main body at positions not overlapping with the through holes and spaced apart at equal intervals along the circumferential direction of the rotating shaft; and A plurality of roller parts are arranged in the arrangement holes.

3. The friction shaft for a slitting machine according to claim 2, characterized in that: The friction core also includes: a retainer bracket mounted side by side on the rotating shaft; and The retainer, which is supported by the retainer bracket, generates torque by gas pressure flowing in from the outside.

4. The friction shaft for a slitting machine according to claim 3, characterized in that: The plurality of friction cores include: Four first cores are arranged at one end of the rotary joint, i.e., the first region; Four second cores are arranged in a second region close to the first region in a region in the opposite direction of the rotary joint coupling position with reference to the first region; four third cores arranged in a third region close to the second region in a region in the opposite direction of the rotary joint coupling position with reference to the second region; and The four fourth cores are arranged in a fourth region that is located close to the third region in a region in the opposite direction of the rotary joint connection position with respect to the third region.

5. The friction shaft for a slitting machine according to claim 3, characterized in that: The plurality of friction cores are sequentially mounted on the first main body.

6. The friction shaft for a slitting machine according to claim 5, characterized in that: The main flow path comprises: A first main flow path, which runs from one end of the rotary joint to the first area; a second main flow path which does not overlap with the first main flow path and which passes from one end connected to the rotary joint to the second area; a third main flow path which does not overlap with the first main flow path and the second main flow path and which penetrates from the end where the rotary joint is connected to the third region; and The fourth main flow path does not overlap with the first to third main flow paths, and penetrates from the end connected to the rotary joint to the fourth region.

7. The friction shaft for a slitting machine according to claim 6, characterized in that: The secondary flow path includes: a first secondary flow path formed in a first region on the first primary flow path; a second secondary flow path formed in a second region on the second primary flow path; a third sub-flow path formed in a third region on the third main flow path; and A fourth sub-flow path is formed in a fourth region on the fourth main flow path.

8. The friction shaft for a slitting machine according to claim 7, characterized in that: The rotating shaft further includes: a plurality of grooves formed along a length direction on an outer peripheral surface of the first main body portion and communicating with the auxiliary flow path.

9. The friction shaft for a slitting machine according to claim 8, characterized in that: The grooves are formed in the first sub-flow path, the second sub-flow path, the third sub-flow path, and the fourth sub-flow path, respectively.

10. The friction shaft for a slitting machine according to claim 3, characterized in that: The clip portion comprises: The upper clamp, if compressed air flows in from the air supply unit, contacts the inner circumference of the winding tube and clamps the winding tube (CHUCKING); A connecting portion extending downward from the bottom of the upper clip; a lower clip having a receiving portion formed thereon and extending from the lower end of the connecting portion toward both ends of the rotating shaft in the circumferential direction; and The elastic member has one end mounted on the mounting portion and the other end in contact with the inner peripheral surface of the second main body portion.

11. The friction shaft for a slitting machine according to claim 10, characterized in that: The elastic component is a compression spring.

12. The friction shaft for a slitting machine according to claim 6, characterized in that: The rotary joint includes: The third main body part, which constitutes the main body; a first connecting hole, which penetrates one end and the other end of the third main body portion and communicates with the first main flow path; a second connecting hole, which penetrates one end and the other end of the third main body portion and communicates with the second main flow path; a third connecting hole that penetrates one end and the other end of the third main body portion and communicates with the third main flow path; and The fourth connecting hole penetrates one end and the other end of the third main body portion to communicate with the fourth main flow path.

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