Slitter friction shaft

Abstract

The present invention relates to a friction shaft for a slitting machine, which enables a winding tube to stably wind a unit material formed by cutting a raw material such as cloth or film at a predetermined interval, and to fix the winding tube even under a low compressed air pressure condition, and has a wide winding tension use range because the pressure range of the compressed air capable of adjusting the winding torque is wide.

Description

TECHNICAL FIELD

[0001] The present invention relates to a friction shaft for a slitter, and more particularly, to a friction shaft for a slitter, which has a wide range of compressed air pressure and a wide range of use of winding tension, and enables a winding tube to stably wind unit materials formed by cutting a raw material such as cloth or film at a predetermined interval, and enables the winding tube to be fixed even at a low compressed air pressure and enables winding torque to be adjusted. BACKGROUND

[0002] Generally, a slitter refers to a device that cuts a raw material such as various papers, cloth, or film at a predetermined interval. In addition, a reel core is used for the purpose of winding a plurality of unit materials formed by the slitter in a roll form.

[0003] Therefore, in order to wind a plurality of unit materials such as various papers, cloth, or film in a roll form on a reel core, a friction shaft for a slitter that rotates the reel core by supplying compressed air is used.

[0004] In relation to this, the winding device provided in Patent Document 1 has the following characteristics, which is configured by forming an air flow passage hole on the outer circumferential surface of a winding roller in which an air flow passage is formed in the center, and inserting a plurality of friction cores from the outside, forming exposure holes and reciprocating rotation holes and a rotation chamber at a plurality of places through the inside and the outside of the friction cores, inserting an operator having a curved portion with a curved bottom surface into the reciprocating rotation holes and the rotation chamber at a certain interval, inserting an O-ring into the operator on the reciprocating hole, providing an O-ring on the upper surface of the inner shaft portion of the operator in the rotation chamber, inserting a press-in plate into the exposure hole, and inserting a plurality of friction cores fixedly connected to the upper portion of the operator into the winding roller to be combined therewith.

[0005] However, in the case of Patent Document 1, compressed air flows into the rotation chamber adjacent to the reciprocating rotation hole, and the operator receives the compressed air pressure transmitted from both the upper and lower portions.

[0006] That is, the movement of the operator in which the press-in plate protrudes from the friction core becomes difficult.

[0007] Therefore, the press-in plate and the reel core cannot be smoothly and closely fitted, the fixation of the reel core becomes more difficult, and the winding work of the reel core can not be smoothly completed.

[0008] Therefore, in order to stably fix the reel core using the press-in plate, it is only possible to further increase the pressure of the compressed air.

[0009] That is, the range of the pressure of the compressed air capable of adjusting the winding torque is very narrow.

[0010] Prior Art Documents

[0011] Patent Documents

[0012] Patent Document 1: Korean Registered Patent No. 1995-0008032 (Published on July 24, 1995) SUMMARY

[0013] Accordingly, the present application has an object to provide a friction shaft for a splitting machine, which can more stably wind a unit material formed by cutting various paper, cloth, or film, etc. raw materials at a predetermined interval, can fix the winding pipe at a lower pressure of compressed air than the prior art, can adjust the winding torque, and can widen the range of the pressure of compressed air and the range of the winding tension compared to the prior art.

[0014] To achieve the above object, the present application provides a friction shaft for a splitting machine, which is provided with a winding pipe for winding a unit material in a reel form, the unit material being formed by cutting various paper, cloth, or film, etc. raw materials at a predetermined interval, characterized by comprising: a rotating shaft having an air supply passage for supplying compressed air in a lengthwise direction formed in the inside center; a plurality of friction cores provided on the rotating shaft in a manner of being able to rotate in place. To ensure that compressed air can be supplied to each of the friction cores, a plurality of air supply holes connected to the air supply passage are formed in the circumferential direction on the outside of the rotating shaft, a through hole for being inserted into the rotating shaft in a through manner is formed in the center of the friction core, a core pipe in which a slot is provided on the inside in a ring form facing the air supply hole and a plurality of exposure holes connected to the slot through the connection hole are formed in the circumferential direction on the outside; a bearing provided on both sides of the through hole; a sealing ring provided between the slot and the pair of bearings; a cylindrical tube provided between the pair of sealing rings to cover the slot and expanded by the compressed air supplied to the air supply hole; a clamping lug provided in the slot, the connection hole, and the exposure hole, a part of which protrudes from the exposure hole to be in close contact with the inside of the winding pipe under the pressure of the expanded tube; and an elastic member provided between the slot and the clamping lug to ensure that a part of the clamping lug is reinserted into the exposure hole when the supply of compressed air is interrupted.

[0015] The present application prevents the compressed air from flowing out of the slot of the core pipe by the tube, and thus, unlike the prior art, the present application transmits the pressure of the compressed air from only one side.

[0016] In addition, in order to fix the winding pipe, the clamping lug, which receives the compressed air pressure, has a structure wider and stronger than the prior art, so that a strong force can be effectively transmitted to the winding pipe.

[0017] That is, the clamping lug can be easily protruded from the friction core by the action of the compressed air, so as to be closely fitted to the winding pipe.

[0018] Therefore, the winding pipe can be more stably fixed to the clamping lug than the prior art, so that the winding pipe can be more stably wound with a unit material formed by cutting various papers, cloths or films and the like at a predetermined interval.

[0019] In addition, the pressure of the compressed air for fixing the winding pipe can be reduced compared to the prior art.

[0020] According to the present application, if the compressed air is further supplied, the groove of the sealing ring is expanded, and at the same time, the friction between the rotating shaft and the friction core is increased, so that a frictional force for increasing the winding tension of the winding pipe can be obtained.

[0021] That is, the frictional force between the rotating shaft and the friction core can be adjusted by adjusting the pressure of the compressed air, and at the same time, the winding tension can be adjusted.

[0022] In other words, compared to the prior art, the use range of the winding tension can be widened, so that more various products can be wound from various papers, cloths or films requiring a low tension to various papers, cloths or films requiring a high tension.

[0023] According to the present application, the insertion plate and the fitting plate are fastened by the fastening member, so that if the fitting plate is damaged by the frictional action with the winding pipe, it can be separated and replaced.

[0024] According to the present application, the first elastic plate and the first elastic support part are provided between the insertion slot and the insertion plate and are supported, so that the clamping lug can be easily returned to the original position after the winding work is completed.

[0025] In addition, since the protruding part of the insertion plate passes through the through hole of the first elastic plate, the elastic member is easily provided.

[0026] According to the present application, in a state where the second and third elastic plates are supported by the first and second planes, the second and third elastic support parts support the insertion plate provided in the insertion slot, so that the clamping lug can be easily returned to the original position after the winding work is completed.

[0027] In addition, since the protruding part of the insertion plate passes through the through hole of the second elastic plate, the elastic member is easily provided.

[0028] In addition, since the third elastic plate is fixed to the insertion plate by the fastening of the fastening member, the third elastic plate does not shake on the insertion plate when the winding work is performed.

[0029] According to the present application, since the length of the insertion plate is elongated and the width is widened, the area of the clamping piece for fixing the wound pipe to which compressed air pressure is transmitted is further widened.

[0030] That is, compared to the prior art, the force of the clamping piece for fixing the wound pipe is further enhanced even under a lower pressure of the compressed air.

[0031] In other words, the pressure of the compressed air for fixing the wound pipe is lowered compared to the prior art.

[0032] The present application further seals the gap through which the compressed air can flow out of the insertion slot by inserting the fitting portion of the core pipe between the fitting portions of the pipes.

[0033] The present application fixes the sealing ring to the inner surface of the core pipe using the gasket and the fixing ring, and the fitting portions of the pipes are more tightly fitted to the fitting portion of the core pipe by the pressure of the fixing ring.

[0034] That is, the gap through which the compressed air can flow out of the insertion slot is further sealed.

[0035] According to the present application, since the fitting protrusion that is pressed by the pressure of the fixing ring attempts to return to its original state by the elastic force, the gap through which the compressed air can flow out of the insertion slot is further sealed.

[0036] According to the present application, since the fitting portion is inserted into the fitting groove between the fitting portions and the protruding portion, the pipes are further fixed to the inner surface of the core pipe, and the gap through which the compressed air can flow out of the insertion slot is further sealed.

[0037] According to the present application, since the first protruding portion or the second protruding portion that is pressed by the pressure of the fixing ring attempts to return to its original state by the elastic force, the gap through which the compressed air can flow out of the insertion slot is further sealed.

[0038] According to the present application, since the coil spring is supported between the insertion slot and the insertion plate, the clamping piece can be easily returned to its original position after the winding work is completed. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a diagram showing the state of the friction shaft of a slitter according to an embodiment of the present application.

[0040] Figure 2 is a front view of a friction shaft for a slitter according to an embodiment of the present application.

[0041] Figure 3 is a sectional view of a friction shaft for a slitter according to an embodiment of the present application.

[0042] Figures 4 to 10 is a partially enlarged sectional view and a detailed view of a friction shaft for a slitter according to an embodiment of the present application.

[0043] Figures 11 to 13 is a use state view of a friction shaft for a slitter according to an embodiment of the present application.

[0044] Figure 14 and Figure 15 is a use state view of a friction shaft for a slitter according to a first modified example of an embodiment of the present application.

[0045] Figure 16 and Figure 17 is a partially enlarged sectional view of a friction shaft for a slitter according to a second modified example of an embodiment of the present application.

[0046] Figure 18 is a partially enlarged sectional view of a friction shaft for a slitter according to a third modified example of an embodiment of the present application.

[0047] Figure 19 and Figure 20 is a partially enlarged sectional view of a friction shaft for a slitter according to a fourth modified example of an embodiment of the present application.

[0048] Figure 21 and Figure 22 is a partially enlarged sectional view of a friction shaft for a slitter according to a fifth modified example of an embodiment of the present application.

[0049] Figures 23 to 25 is a perspective view and a use state view of a friction shaft for a slitter according to a sixth modified example of an embodiment of the present application.

[0050] Figures 26 to 28 is a perspective view and a use state view of a friction shaft for a slitter according to a seventh modified example of an embodiment of the present application.

[0051] Figures 29 to 31 is a perspective view and a use state view of a friction shaft for a slitter according to an eighth modified example of an embodiment of the present application.

[0052] 100: rotating shaft 110: air supply passage

[0053] 120: air supply hole 200: friction core

[0054] 210: core pipe 211: through hole

[0055] 212: slot 213: connecting hole

[0056] 214: exposure hole 215: fitting portion

[0057] 220: bearing 230: seal ring

[0058] 231: recess 240: pipe

[0059] 241: fitting portion 241a: fitting protrusion

[0060] 241b: first recess 241c: first protrusion

[0061] 241d: second recess 241e: second protrusion

[0062] 242: fitting groove 243: protrusion

[0063] 250: clamping clip 251: insertion plate

[0064] 251a: protrusion 251b: fastening hole

[0065] 251c: first plane 251d: second plane

[0066] 251e: fastening hole 252: fitting plate

[0067] 252a: fastening hole 260: elastic member

[0068] 261: first elastic plate 261a: through hole

[0069] 262: first elastic support portion 263: second elastic plate

[0070] 263a: through hole 264: second elastic support portion

[0071] 265: third elastic plate 266: third elastic support portion

[0072] 267: coil spring 270: washer

[0073] 280: fixing ring 1000: friction shaft for slitting machine DETAILED DESCRIPTION

[0074] Hereinafter, the configuration of a specific embodiment of the present application will be explained in detail with reference to the accompanying drawings.

[0075] As Figures 1 to 31As shown, the friction shaft 1000 for a slitting machine according to the embodiment of the present application and the first to eighth modified examples is provided on a slitting machine 2 including the following parts, i.e., the slitting machine 2 includes a supply device 2b that supplies raw materials 1 such as various paper, cloth, or film wound in a reel form to a winding device 2a; a cutting device 2c that cuts the raw materials 1 at predetermined intervals; and the winding device 2a that winds unit materials 1a formed by cutting the raw materials 1 at predetermined intervals in a reel form using a winding tube 3.

[0076] That is, the friction shaft 1000 for a slitting machine is provided on the winding device 2a of the slitting machine 2 and thus is included.

[0077] Here, the raw materials 1 can also be arranged in multiple forms by printing the same design shape or pattern before the raw materials 1 become the unit materials 1a.

[0078] In addition, the winding device 2a includes a driving portion 2a' including a driving motor or the like that rotates the friction shaft 1000 for a slitting machine and an air supply portion 2a'' that can be an air compressor or the like that supplies compressed air to the friction shaft 1000 for a slitting machine.

[0079] In addition, the unit materials 1a are formed in multiple, and the winding tubes 3 are also formed in multiple to match the unit materials 1a and are provided outside the friction shaft 1000 for a slitting machine.

[0080] Here, the winding tube 3 is formed of a reel core, an FRP core, or the like.

[0081] In addition, as shown, Figures 1 to 13 As shown, the friction shaft 1000 for a slitting machine according to the embodiment of the present application includes a rotating shaft 100 that is rotated by the driving portion 2a' and has an air supply passage 110 that supplies compressed air from the air supply portion 2a'' in a length direction formed in an inner center, and a plurality of friction cores 200 that are provided on the rotating shaft 100 in a manner capable of rotating in place and have the winding tube 3 provided outside.

[0082] Here, the plurality of friction cores 200 are maintained at intervals by an interval member provided on the rotating shaft 100 and do not deviate from the original position by a fixing member provided on the rotating shaft 100.

[0083] In addition, the rotating shaft 100 is formed of a metal material or the like.

[0084] In addition, in order to ensure that compressed air can be supplied to each of the friction cores 200, a plurality of air supply holes 120 connected to the air supply passage 110 are formed in a circumferential direction outside the rotating shaft 100.

[0085] Here, the air supply holes 120 are formed in plurality at intervals along the circumferential direction of the rotating shaft 100.

[0086] In addition, the friction core 200 includes a core pipe 210 in which a through hole 211 is formed in the center to be inserted through the rotating shaft 100, a slot 212 is provided in the inner center in a ring shape to face the air supply holes 120, and a plurality of exposure holes 214 connected through connection holes 213 and the slot 212 are provided in the outer side in the circumferential direction.

[0087] Here, the connection holes 213 are smaller in size than the exposure holes 214.

[0088] In addition, the exposure holes 214 are provided in plurality at intervals along the circumference of the core pipe 210 in a form to face the air supply holes 120, and the core pipe 210 is composed of a metal material or the like.

[0089] In addition, the friction core 200 includes bearings 220 provided at both ends of the through hole 211, sealing rings 230 respectively between the slot 212 and the pair of bearings 220, and a cylindrical pipe 240 between the pair of sealing rings 230 to cover the slot 212 and expand by the compressed air supplied from the air supply holes 120.

[0090] Here, grooves 231 are formed on the outer sides of the pair of sealing rings 230 toward the pipe 240, and the sealing rings 230 are in the form of a retainer composed of a rubber material or the like.

[0091] In addition, in order to pass through the rotating shaft 100, the pipe 240 is formed in a cylindrical form with the center open and is formed not to be in close contact with the rotating shaft 100 and is composed of a rubber material or the like.

[0092] In addition, the bearings 220 are formed in the form of ball bearings.

[0093] In addition, the friction core 200 includes a clamping clip 250 provided in the slot 212 and the connection holes 213 and the exposure holes 214, a part of which protrudes from the exposure holes 214 under the pressure of the expanded pipe 240 to be in close contact with the inner surface of the winding pipe 3, and an elastic member 260 provided between the slot 212 and the clamping clip 250 to ensure that a part of the clamping clip 250 is reinserted into the exposure holes 214 when the supply of the compressed air is interrupted.

[0094] Here, the clamping clip 250 and the elastic member 260 are composed of a metal material or the like.

[0095] In addition, the clamping jaw 250 includes an insertion plate 251 inserted into the insertion slot 212 in a curved manner, a protruding portion 251a of the insertion connecting hole 213 protruding from the outside center, a fastening hole 251b provided on the outside of the protruding portion 251a, and a fitting plate 252 inserted into the exposed hole 214, the fitting plate 252 having a fastening hole 252a formed on the outside to be fastened by the fastening member, and being tightly fitted to the inner surface of the winding pipe 3.

[0096] Here, the fastening holes 251b and 252a are composed of nut portions to be fastened by bolt portions of the fastening member.

[0097] In addition, the elastic member 260 is provided between the insertion slot 212 and the insertion plate 251.

[0098] In addition, the elastic member 260 includes a first elastic plate 261 provided in a curved manner to be supported by the insertion slot 212, the first elastic plate 261 having a through hole 261a formed on the outside to be inserted into the protruding portion 251a in a through manner, and a first elastic support portion 262 provided on the outside of the first elastic plate 261 along both sides of the through hole 261a to be supported by the insertion plate 251.

[0099] Here, the first elastic support portion 262 is protruded from the outside edge of the first elastic plate 261.

[0100] In addition, a fitting portion 241 is protruded and provided on both side ends of the outside of the pipe 240.

[0101] In addition, a fitting portion 215 is protruded and provided on the inner surface of the core pipe 210 to be inserted between a pair of fitting portions 241 along both sides of the insertion slot 212.

[0102] In addition, the friction core 200 includes a washer 270 provided between the bearing 220 and the sealing ring 230 to be tightly fitted to the outer wheel of the bearing 220, and a fixing ring 280 provided between the washer 270 and the fitting portion 241 to allow the sealing ring 230 to be fixed between the washer 270 and the fitting portion 241.

[0103] Here, the washer 270 is composed of a metal material or the like to be not tightly fitted to the inner wheel of the rotating shaft 100 and the bearing 220.

[0104] In addition, the fixing ring 280 is composed of a metal material or the like to be not tightly fitted to the rotating shaft 100.

[0105] In addition, the fixing ring 280 presses the fitting portion 241 of the fitting portion 215.

[0106] In addition, the core pipe 210 includes a main body 210a having a through hole 211, a slot 212, a connection hole 213, an exposure hole 214, and a fitting portion 215, and a cover 210b having the through hole 211 and coupled to the main body 210a to fix the bearing 220, the seal ring 230, the pipe 240, the washer 270, and the fixing ring 280 to the main body 210a.

[0107] In addition, as shown in the following, the operation and effects of the friction shaft 1000 for a slitting machine according to the embodiment of the present application having the above-described configuration will be described. Figures 1 to 13

[0108] In order to ensure that a plurality of unit materials 1a, which are formed by cutting a raw material 1 such as paper, cloth, or film at a predetermined interval, can be wound in a roll shape, a plurality of winding pipes 3 are inserted outside a plurality of friction cores 200 of the friction shaft 1000 for a slitting machine.

[0109] Then, the compressed air is supplied to the air supply passage 110 of the rotating shaft 100 through the air supply portion 2a''.

[0110] Then, the compressed air moves along the air supply passage 110 and is supplied into each of the friction cores 200 through the plurality of air supply holes 120.

[0111] That is, the compressed air is supplied to the inside of the pipe 240.

[0112] Here, since the slot 212 of the core pipe 210 is covered by the pipe 240, a gap formed between the pipe 240 and the slot 212 can be sealed.

[0113] That is, the compressed air can be prevented from flowing out of the slot 212 of the core pipe 210.

[0114] In addition, the fitting portion 241 of the pipe 240 is tightly fitted to the fitting portion 215 of the core pipe 210 by the pressure of the fixing ring 280, so that the gap formed between the pipe 240 and the slot 212 can be further sealed.

[0115] That is, the compressed air can be prevented from flowing out of the slot 212 of the core pipe 210.

[0116] In addition, a gap formed between the rotating shaft 100 and the friction core 200 is sealed by a pair of seal rings 230 respectively positioned at both sides of the pipe 240.

[0117] That is, the compressed air cannot be discharged to the outside through the gap formed between the rotating shaft 100 and the friction core 200.

[0118] ​Then, the pipe 240 is expanded toward the insertion groove 212 while pressing the insertion plate 251 of the clamping clip 250 under the action of the compressed air supplied from the air supply hole 120.

[0119] Then, the insertion plate 251 is moved toward the outside of the friction core 200 along the insertion groove 212 under the pressure of the expanded pipe 240. At the same time, the protruding portion 251a of the insertion plate 251 is also moved toward the outside of the friction core 200 along the connection hole 213 and the through hole 261a of the elastic member 260.

[0120] Here, since the compressed air does not flow out of the insertion groove 212, the insertion plate 251 receives the pressure of the compressed air that expands the pipe 240 only from one side, and thus easily moves toward the outside of the friction core 200 along the insertion groove 212.

[0121] In addition, the first elastic plate 261 and the first elastic support portion 262 of the elastic member 260 are deformed and compressed under the action of the insertion plate 251.

[0122] Then, the fitting plate 252 of the clamping clip 250 protrudes from the exposure hole 214, and thus closely fits the inner surface of the winding pipe 3.

[0123] That is, the winding pipe 3 is fixed to the friction core 200.

[0124] Then, the rotation shaft 100 is rotated by driving the driving portion 2a'.

[0125] Then, the plurality of friction cores 200 rotate together with the rotation shaft 100 through the bearing 220.

[0126] Then, the plurality of winding pipes 3 rotate together with the plurality of friction cores 200 by the friction between the fitting plate 252 of the clamping clip 250 that closely fits the inner surface.

[0127] Therefore, the plurality of winding pipes 3 respectively wind the plurality of unit materials la using winding tension.

[0128] Then, when the plurality of unit materials la are respectively wound in the form of a roll around the plurality of winding pipes 3, the supply of the compressed air to the rotation shaft 100 is interrupted, and the driving of the driving portion 2a' is stopped.

[0129] Then, the pipe 240 is restored to its original shape by shrinking under the influence of the reduced compressed air, and the fitting plate 252 of the clamping clip 250 is again inserted into the exposure hole 214 with the aid of the elastic force of the first elastic plate 261 and the first elastic support portion 262 of the elastic member 260 that are compressed.

[0130] Then, the close contact state between the inner face of the winding pipe 3 and the contact plate 252 of the clamping clip 250 is released.

[0131] Therefore, the plurality of winding pipes 3 respectively wound with the plurality of unit materials 1a are drawn out from the slitting machine friction shaft 1000 of the present application, thereby ending the winding work.

[0132] In addition, if the thickness of the raw material 1 is thick and the weight is heavy, the compressed air corresponding thereto is further supplied to the air supply passage 110 of the rotating shaft 100, so that the winding tension of the winding pipe 3 is increased.

[0133] Then, under the pressure of the further supplied compressed air, the internal pressure of the pipe 240 is increased, as shown in Figure 13 The grooves 231 of the pair of sealing rings 230 located on both sides of the pipe 240 are deformed and expanded.

[0134] Then, the sealing rings 230 whose grooves 231 are expanded are more closely contacted with the rotating shaft 100, and the friction is increased.

[0135] That is, the slitting machine friction shaft 1000 obtains the rotating force for increasing the winding tension of the winding pipe 3.

[0136] In addition, the pipe 240 is expanded toward the insertion slot 212 under the pressure of the further supplied compressed air, and further pressurizes the insertion plate 251 of the clamping clip 250.

[0137] In addition, the contact plate 252 of the clamping clip 250 protrudes from the exposure hole 214 and is more closely contacted with the inside of the winding pipe 3.

[0138] That is, as shown in Figure 13 The winding tension of the winding pipe 3 is increased as the pressure of the compressed air increases.

[0139] Therefore, the plurality of winding pipes 3 respectively wound with the plurality of unit materials 1a are wound with the increased winding tension.

[0140] Then, as shown in Figure 14 and Figure 15 In the slitting machine friction shaft 1000 according to the first modified example of the embodiment of the present application, the length of the insertion plate 251 in the circumferential direction of the core pipe 210 is set to be long, and the adjacent insertion plates 251 are ensured to be close to each other.

[0141] That is, the length of each of the insertion plates 251 is set to be long, so that each of the insertion plates 251 is close to each other.

[0142] In addition, the width of the insertion plate 251 in the length direction of the core pipe 210 is widened to ensure the width of the approach slot 212.

[0143] Therefore, if compressed air is supplied to the inside of the pipe 240 through the air supply hole 120, the pipe 240 is expanded and the insertion plate 251 of the clamping clip 250 is pressurized.

[0144] Here, since the insertion plate 251 is long in length and wide in width, the area in contact with the expanded pipe 240 is wider than in the first embodiment.

[0145] That is, the insertion plate 251 transmits the pressure of the compressed air over a larger area than in the first embodiment.

[0146] Then, the fitting plate 252 of the clamping clip 250 protrudes from the exposure hole 214 through the insertion plate 251 whose pressure transmission area has increased due to the pressure of the compressed air, and is more tightly fitted to the inside of the wrapped pipe 3 by a greater force.

[0147] That is, the wrapped pipe 3 is more firmly fixed to the friction core 200.

[0148] In addition, as shown in Figs. 9 and 10, in the slitter friction shaft 1000 according to the second modification of the embodiment of the present application, the fitting protrusion 241a that is tightly fitted to the fitting portion 215 is provided on the outer side of the fitting portion 241. Figure 16 Figure 17 Then, in a state where the fitting protrusion 241a of the fitting portion 241 is supported by the fitting portion 215, the fixing ring 280 is pressurized and deformed.

[0149] That is, the fitting protrusion 241a is crushed by the pressure.

[0150] Therefore, the gap formed between the fixing ring 280, the fitting portion 241, and the fitting portion 215 is further sealed by the fitting protrusion 241a that attempts to return to its original state.

[0151] That is, the outflow of the compressed air to the approach slot 212 of the core pipe 210 can be prevented.

[0152] In addition, as shown in Figs. 11 and 12, in the slitter friction shaft 1000 according to the third modification of the embodiment of the present application, the protrusion 243 is provided on the outer side of the pipe 240 to ensure that the fitting groove 242 is formed between the protrusion 243 and the fitting portion 241.

[0153] Then, the fitting portion 215 is inserted into the fitting groove 242. Figure 18 That is, the fitting protrusion 241a is crushed by the pressure.

[0154] Therefore, the gap formed between the fixing ring 280, the fitting portion 241, and the fitting portion 215 is further sealed by the fitting protrusion 241a that attempts to return to its original state.

[0155] ​Therefore, the gap formed between the fitting portion 241 and the fitting portion 215 is further sealed by the protrusion portion 243.

[0156] That is, the compressed air can be prevented from flowing out to the insertion groove 212 of the core pipe 210.

[0157] In addition, as the fitting portion 215 is inserted into the fitting groove 242, the pipe 240 is more firmly fixed inside the core pipe 210.

[0158] In addition, as Figure 19 and Figure 20 shown, in the friction shaft 1000 for the slitting machine according to the 4th modified example of the embodiment of the present application, a first protrusion portion 241c is provided on the outer side of the fitting portion 241 toward the fitting portion 215, so that a first groove 241b is formed between the fitting portion 241 and the first protrusion portion 241c.

[0159] Here, the first protrusion portion 241c is closely fitted with the fitting portion 215.

[0160] In addition, in the state that the first protrusion portion 241c of the fitting portion 241 is supported by the fitting portion 215, the fixing ring 280 is pressed, so that the first groove 241b is deformed.

[0161] That is, the first protrusion portion 241c is collapsed due to the extrusion.

[0162] Therefore, the gap formed between the fixing ring 280, the fitting portion 241 and the fitting portion 215 is further sealed by the first protrusion portion 241c which tries to restore the original state.

[0163] That is, the compressed air can be prevented from flowing out to the insertion groove 212 of the core pipe 210.

[0164] In addition, as Figure 21 and Figure 22 shown, in the friction shaft 1000 for the slitting machine according to the 5th modified example of the embodiment of the present application, a second protrusion portion 241e is provided on the outer side of the fitting portion 241 toward the opposite side of the fitting portion 215, so that a second groove 241d is formed between the fitting portion 241 and the second protrusion portion 241e.

[0165] Here, the second protrusion portion 241e is closely fitted with the fixing ring 280.

[0166] In addition, in the state that the fitting portion 241 is supported by the fitting portion 215, the second protrusion portion 241e is pressed by the fixing ring 280, so that the second groove 241d is deformed.

[0167] That is, the second protrusion portion 241e is collapsed due to the extrusion.

[0168] Therefore, the gap formed between the retaining ring 280, the mating part 241 and the fitting part 215 is further sealed by the second protrusion 241e, which attempts to restore the original state.

[0169] That is, compressed air does not flow out into the slot 212 of the core tube 210.

[0170] In addition, such as Figures 23 to 25 As shown, in the friction shaft 1000 for a slitting machine according to the sixth modified example of the present invention, a flat first plane 251c is formed on the outer side of the insertion plate 251 along the periphery of the protrusion 251a.

[0171] Additionally, the elastic member 260 includes: a second elastic plate 263, which is formed as a flat plate and fits tightly against the first plane (251c), and has a through hole 263a on the outside for inserting the protrusion 251a through; and a second elastic support 264, which is disposed on both sides of the through hole 263a on the outside of the second elastic plate 263 and is supported by the slot 212.

[0172] Here, the second elastic support portion 264 is formed by protruding from the outer corner of the second elastic plate 263.

[0173] Therefore, when the tube 240 expands under the action of compressed air supplied from the air supply hole 120, the insertion plate 251 moves along the slot 212 toward the outside of the friction core 200 under the pressure of the expanded tube 240.

[0174] Here, with the second elastic plate 263 of the elastic member 260 supported by the first plane 251c and the second elastic support portion 264 supported by the slot 212, the second elastic support portion 264 deforms under the influence of the moving insertion plate 251.

[0175] Then, if the supply of compressed air to the rotating shaft 100 is interrupted, the tube 240 will contract and return to its original shape due to the reduced compressed air, and the second elastic support 264 of the elastic member 260 will return to its original shape by means of elastic force in the deformed state.

[0176] In addition, such as Figures 26 to 28 As shown, in the friction shaft 1000 for a slitting machine according to the seventh modified example of the present invention, a flat second plane 251d is formed on the outer side of the insertion plate 251 along the periphery of the protrusion 251a, and fastening holes 251e are respectively provided on the second plane 251d along both sides of the protrusion 251a.

[0177] Additionally, the elastic member 260 includes: a pair of third elastic plates 265, which are formed as flat plates and are tightly fitted to the second plane 251d on both sides of the protrusion 251a, and have fastening holes 265a formed on the outer side for fastening with fastening members and fastening holes 251e; and a third elastic support 266, which is disposed on the outer side of the third elastic plates 265 and is supported by the slot 212.

[0178] Here, the third elastic support portion 266 protrudes from the outer corner of the third elastic plate 265.

[0179] In addition, the third elastic plate 265 is fixed to the insertion plate 251 by fastening members that are connected by riveting or bolting to fastening holes 251e and 265a.

[0180] Therefore, if the tube 240 expands due to the compressed air supplied from the air supply hole 120, the insert plate 251 moves along the slot 212 toward the outside of the friction core 200 by the pressure of the expanded tube 240.

[0181] Here, the third elastic plate 265 of the elastic member 260 is fixed on the second plane 251d and supported by the fastening holes 251e and 265a. When the third elastic support 266 is supported by the slot 212, the third elastic support 266 is deformed by the moving insertion plate 251.

[0182] Furthermore, if the supply of compressed air to the rotating shaft 100 is interrupted, the tube 240 will shrink and return to its original shape due to the reduced compressed air, and the third elastic support portion 266 of the elastic member 260 will return to its original shape by means of elastic force in the deformed state.

[0183] In addition, such as Figures 29 to 31 As shown, the elastic member 260 of the friction shaft 1000 for the slitting machine in the eighth variation of the present invention includes: a helical spring 267, which is supported on both sides by a slot 212 and an insertion plate 251, respectively.

[0184] Here, the helical spring 267 is respectively disposed on both sides of the protrusion 251a between the slot 212 and the insertion plate 251.

[0185] In addition, grooves for inserting and fixing helical springs 267 are formed on the outside of the slot 212 and the insertion plate 251, respectively.

[0186] In addition, the helical spring 267 is made of metal or the like.

[0187] Therefore, if the tube 240 is expanded by compressed air supplied from the air supply hole 120, the insertion plate 251 is moved outward of the rubbing core 200 along the insertion slot 212 by the pressure of the expanded tube 240.

[0188] Here, the coil spring 267 of the elastic member 260 is deformed and compressed by the insertion plate 251 in a state where it is supported by the insertion slot 212 and the insertion plate 251 on both sides.

[0189] In addition, if the supply of compressed air to the rotating shaft 100 is interrupted, the tube 240 is restored to its original shape by contracting due to the reduced compressed air, and the coil spring 267 of the elastic member 260 is restored to its original shape by the elastic force in a deformed state.

[0190] The present application has been described above with reference to specific preferred embodiments and to the accompanying drawings, but the present application is not limited to the above-described embodiments, and various changes and modifications can be made by those skilled in the art without departing from the spirit of the present application.

Claims

1. A friction shaft for a slitter, which realizes high strength clamping and a wide range of variable torque adjustment simultaneously using one air pressure supply passage, the outer surface of the friction shaft being provided with a winding tube in which a unit material is wound in a reel form, the unit material being formed by cutting a raw material such as paper, cloth, or film at a predetermined interval, the friction shaft for a slitter comprising: a rotating shaft (100) in which an air supply passage (110) for supplying compressed air in a lengthwise direction is formed in the center; and a plurality of friction cores (200) provided on the rotating shaft (100) in a manner capable of rotating in place, wherein: in order to ensure that compressed air can be supplied to each of the friction cores (200), a plurality of air supply holes (120) connected to the air supply passage (110) are formed in the outer surface of the rotating shaft (100) in a circumferential direction, wherein: the friction core (200) comprises: a core tube (210) in which a through hole (211) is formed in the center to be inserted into the rotating shaft (100), an insertion groove (212) facing the air supply hole (120) is provided in the inner surface of the core tube (210) in a ring shape, and a plurality of exposure holes (214) connected to the insertion groove (212) through connection holes (213) are formed in the outer surface of the core tube (210) in a circumferential direction; bearings (220) provided on both sides of the through hole (211); sealing rings (230) respectively positioned between the insertion groove (212) and the pair of bearings (220); a cylindrical tube (240) positioned between the pair of sealing rings (230) to cover the insertion groove (212) and expanded by the compressed air supplied from the air supply hole (120); a clamping clip (250) provided in the insertion groove (212), the connection hole (213), and the exposure hole (214), a portion of which protrudes from the exposure hole (214) to be in close contact with the inner surface of the winding tube under the pressure of the expanded tube (240); and an elastic member (260) provided between the insertion groove (212) and the clamping clip (250) to ensure that a portion of the clamping clip (250) is reinserted into the exposure hole (214) when the supply of compressed air is interrupted, wherein: the clamping clip (250) comprises: an insertion plate (251) bent to be inserted into the insertion groove (212), the outer surface of which is provided with a protruding portion (251a) inserted into the connection hole (213), and the outer surface of the protruding portion (251a) is provided with a fastening hole (251b); and a fitting plate (252) inserted into the exposure hole (214), the outer surface of which is provided with a fastening hole (252a) fastened to the fastening hole (251b) by a fastening member.

2. The friction shaft for a slitter according to claim 1, wherein: recesses (231) are respectively provided on the outer surfaces of the pair of sealing rings (230) to face the tube (240). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 3. The friction shaft for a slitting machine according to claim 1, wherein the elastic member (260) comprises: a first elastic plate (261) having a through hole (261a) into which the protrusion (251a) is inserted in a through manner, and being bent to be supported by the insertion groove (212); and a first elastic support (262) provided on the outer side of the first elastic plate (261) at both sides of the through hole (261a) and supported by the insertion plate (251).

4. The friction shaft for a slitting machine according to claim 1, wherein the length of the insertion plate (251) in the circumferential direction of the core pipe (210) is set to be long in a manner approaching the adjacent insertion plate (251), and the width of the insertion plate (251) in the longitudinal direction of the core pipe (210) is set to be wide in a manner approaching the width of the insertion groove (212).

5. The friction shaft for a slitting machine according to claim 1, wherein a fitting portion (241) is provided on the outer side of the pipe (240), and a fitting protrusion (215) is provided on the inner side of the core pipe (210) to be inserted between a pair of fitting portions (241) on both sides of the insertion groove (212).

6. The friction shaft for a slitting machine according to claim 5, wherein the friction core (200) comprises: a washer (270) provided between the bearing (220) and the seal ring (230) to be closely fitted to the outer rim of the bearing (220); and a fixing ring (280) provided between the washer (270) and the fitting portion (241) to secure the seal ring (230) between the fixing ring (280) and the washer (270).

7. The friction shaft for a slitting machine according to claim 5, wherein a fitting protrusion (241a) is provided on the outer side of the fitting portion (241) to be closely fitted to the fitting protrusion (215).

8. The friction shaft for a slitting machine according to claim 5, wherein a protrusion (243) is provided on the outer side of the pipe (240) to form a fitting groove (242) between the protrusion (243) and the fitting portion (241), and the fitting protrusion (215) is inserted into the fitting groove (242).

9. The friction shaft for a slitting machine according to claim 5, wherein a first protrusion (241c) is provided on the outer side of the fitting portion (241) toward the fitting protrusion (215) to form a first recess (241b) between the first protrusion (241c) and the fitting portion (241).

10. The friction shaft for a slitting machine according to claim 5, wherein a second protrusion (241e) is provided on the outer side of the fitting portion (241) toward the opposite side of the fitting protrusion (215) to form a second recess (241d) between the second protrusion (241e) and the fitting portion (241).

11. The friction shaft for a slitting machine according to claim 1, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ A first plane (251c) is formed along the periphery of the protrusion (251a) on the outer surface of the insertion plate (251), The elastic member (260) includes: A second elastic plate (263) is formed in a flat plate shape, closely adheres to the first plane (251c), and is provided with a through hole (263a) on the outer surface, which is inserted into the protrusion (251a) in a through manner; A second elastic support portion (264) is provided on the outer surface of the second elastic plate (263) along both sides of the through hole (263a) and is supported by the insertion groove (212).

12. The friction shaft for a slitting machine according to claim 1, wherein A second plane (251d) is formed along the periphery of the protrusion (251a) on the outer surface of the insertion plate (251), Fastening holes (251e) are respectively provided on the second plane (251d) along both sides of the protrusion (251a), The elastic member (260) includes: A pair of third elastic plates (265) are formed in a flat plate shape, closely adhere to the second plane (251d) along both sides of the protrusion (251a), and are provided with fastening holes (265a) on the outer surface, which are fastened to the fastening holes (251e) by a fastening member; A third elastic support portion (266) is provided on the outer surface of the third elastic plate (265) and is supported by the insertion groove (212).

13. The friction shaft for a slitting machine according to claim 1, wherein The elastic member (260) includes: A coil spring (267) is supported by the insertion groove (212) and the insertion plate (251) on both sides, respectively.

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