JP2010019369A - Guide roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out the reduction and stabilization of the rotation torque of a guide roller, the pollution control of an operating environment, and the prevention of quality deterioration of a conveyed article. <P>SOLUTION: In the guide roller of a deep groove ball bearing type wherein one or more rolling elements comprise a composite material containing a solid lubricant in regard to a plurality of the rolling elements 4 rotatably retained by a retainer 3 between an inner ring 1 and an outer ring 2, a solid lubricating film 3a of the retainer 3 of at least a surface of a surface formed with a friction face with the rolling element 4 is formed of a solid lubricant or a composite material including the solid lubricant. The outer ring 2 or a contact surface with track of the roller is formed by of solid lubricant or a composite material containing the solid lubricant, and the plurality of ball type rolling elements 4 comprise load rolling elements 4a applied with bearing loads and one or more non-load rolling elements 4b of small diameters and not applied with the bearing loads, and the non-load rolling element 4b is formed of a composite material containing the solid lubricant. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a guide roller using a solid lubricant, and is further applied to a film stretching machine using this as a guide roller for a tenter clip, or an incinerator or a sintering furnace using such a guide roller. This is related to the dolly.

As an example of a guide roller that can withstand high-temperature use conditions, a tenter clip guide roller for a film stretching machine is known, which will be described with reference to FIGS.
First, as shown in FIG. 4, when the film stretcher 11 prepares a resin raw sheet 13 extruded by a melt extruder 14, the film stretcher 11 holds the edge of the raw sheet 13 between a plurality of tenter clips. The sheet 13 is conveyed while being stretched so as to spread and continuously stretched.

  As shown in FIGS. 5 and 6, the tenter clip 21 is supported on the guide rails 22 and 23 via the outer ring rotating rolling bearings as guide rollers, and is attached to the endless annular guide rails 22 and 23 for film conveyance. It goes around a predetermined section along and is repeatedly used for the stretching process.

  In such a stretching process, since the film 13 is maintained at a required temperature of, for example, about 150 to 250 ° C., a rolling bearing having excellent heat resistance is used for the mechanical portion of the tenter clip that can withstand such high temperature use conditions. Used guide rollers.

  It is known that a guide roller comprising a rolling bearing filled with lubricating grease is used for the mechanical portion of a conventional tenter clip, and a sealing structure is important for sealing lubricating oil and lubricating grease in such a rolling bearing. It performs the function (Patent Document 1).

  However, the elasticity of the rubber seal is lowered under high temperature use conditions, and the so-called labyrinth structure that is a structure necessary for the seal cannot be maintained. Lubricating oils and greases tend to cause unstable factors such as reduced viscosity and thermal decomposition of base oils, thickeners and other additives, and there is a concern that low torque rotation of stable rolling bearings cannot be expected. .

As a lubrication system for a rolling bearing that requires a stable low rotational torque even in a high temperature atmosphere, a solid lubrication system can be adopted instead of the oil lubrication or grease lubrication described above.
For example, polytetrafluoroethylene (PTFE) is well known as a solid lubricant for solid lubricated rolling bearings, but this is because the limit of the use temperature is a metal-based solid due to thermal decomposition at a temperature exceeding 300 ° C. Low compared to lubricants.

  As solid lubricants that can be used even under conditions higher than PTFE, metallic solid lubricants such as tungsten disulfide and molybdenum disulfide are known, and solid lubricated rolling bearings in which these are provided as a lubricant film on the surface of the rolling element. Is also known (Patent Document 2).

  Further, the rolling elements of the rolling bearing are composed of a loaded rolling element to which a bearing load is applied and a non-loaded rolling element having a smaller diameter and no bearing load. One or more of the unloaded rolling elements are made of 90% tungsten disulfide. A solid lubricating film made of molybdenum disulfide or tungsten disulfide may be provided on the surface of any one of a bearing (Patent Document 3) formed of a sintered material containing at least volume%, and an inner ring, an outer ring, and a load rolling element. Known (Patent Document 4).

JP 2007-232089 A JP 2008-014394 A JP 2005-048852 A JP 2005-133881 A

  However, in the above-described conventional guide roller, one or more of the non-load rolling elements are formed of a sintered material containing tungsten disulfide, and molybdenum disulfide is formed on any surface of the inner ring, the outer ring, and the load rolling elements. Alternatively, there is one provided with a solid lubricant film made of tungsten disulfide, but in this case, the amount of solid lubricant supplied to the friction surface from the unloaded rolling element tends to be insufficient at the initial operation of the guide roller, There is a problem that it is difficult to stabilize the bearing rotational torque at a low initial stage of operation.

  In addition, when such a guide roller is used as a guide roller for a tenter clip, it is expected that the rotational torques of the plurality of guide rollers will be different at the time of starting. Since the running speed is different, the film cannot be stretched with a stable tension, and the stretched film is distorted or twisted, and cannot be manufactured with a stable quality.

  Furthermore, it is necessary to lubricate the contact surface of the guide roller with the guide rail. If this is done by liquid lubrication, the lubricating oil will flow out or scatter and contaminate the surrounding environment where the guide roller is used. There is also a problem that the quality of a transported article such as a film is lowered.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems and to reduce the rotational torque of the guide roller from the initial stage of operation so that the solid lubricant supply amount is sufficient even at the initial stage of operation of the solid-lubricated rolling bearing. It is stable and does not pollute the surrounding environment where the guide roller is used, and does not deteriorate the quality of a transported article such as a film.

  In particular, in the tenter clip guiding guide roller of the film stretching machine, it is also a problem to stabilize the running torque of the plurality of tenter clips by keeping the rotational torque low and stable from the start.

  It is also an object to provide a film stretching machine that supports the tenter clip so that a stable stretching action can be obtained from the start, so that a uniform film without distortion can be stably produced.

  Furthermore, for a carriage provided with a guide roller for article conveyance guidance on the vehicle body, the guide roller rotation torque should be low and stable from the beginning of operation, and the carriage can be moved smoothly at all times, or such a carriage can be used under high temperature conditions. As such, even when used in a particularly severe incinerator or sintering furnace in a heated state, it can be smoothly used for conveying articles.

  In order to solve the above-described problems of the guide roller, in the guide roller that can move along the raceway by rotating the outer ring of the rolling bearing or the roller provided integrally therewith to the raceway in a rotatable manner, A contact surface with the raceway is formed of a solid lubricant or a composite material including the same, and at least one of the rolling elements is rotatably held by a cage between the outer ring and the inner ring. The guide roller is made of a lubricant-containing composite material, and the surface including at least the contact surface with the rolling element of the cage is formed of a solid lubricant or a composite material containing the same.

  In the guide roller of the present invention configured as described above, the contact surface with the outer ring or the raceway of the roller is formed of a solid lubricant or a composite material containing the same. There is no need to use oil, and therefore, the liquid lubricant does not scatter and does not contaminate the surrounding environment where the guide roller is used, and the quality of transported articles such as films does not deteriorate.

  The guide roller according to the present invention includes a rolling element made of a composite material containing a solid lubricant, and a cage in which a surface including at least a contact surface with the rolling element is formed of a solid lubricant or a composite material containing the same. In addition, since the solid lubricant is supplied from both the rolling element and the cage without interruption, it is transferred to a friction surface such as the surface of the inner / outer ring and exhibits a sufficient lubricating action.

In addition, since the guide roller includes the solid lubricant on both sides of the one or more rolling elements made of the composite material containing the solid lubricant when contacting the surface of the cage, the guide roller Solid lubricant is supplied from both surfaces of the rolling elements and the cage even in a low-speed rotation state, and it is supplied for a long time without interruption, so it is transferred to the friction surface that requires lubrication such as the inner and outer ring surfaces. Sufficient lubrication.
Due to such a good lubricating action, the solid lubricated rolling bearing of the present invention can stabilize the bearing rotational torque at a low level from the beginning of operation.

  Further, the plurality of rolling elements include a loaded rolling element to which a bearing load is applied and a non-loaded rolling element having a smaller diameter and not loaded with a bearing load, and at least one or more non-loaded rolling elements contain a solid lubricant. A guide roller made of a composite material is preferable in order to stabilize the low rotational torque state when the guide roller is rotated at the beginning or intermittently.

  This is because a non-load rolling element having a smaller diameter than a loaded rolling element often rotates more than a loaded rolling element, particularly when the rolling bearing is initially in the start-up or under conditions where the rotation and stop are repeated intermittently. The non-load rolling element having a smaller diameter than the rolling element frequently makes frictional contact with the cage. At that time, tungsten disulfide or a sulfide with good lubricity is supplied from the surface of the unloaded rolling element to the required friction surface.

  In order to fully exhibit such a lubricating action, the condition that the diameter A of the unloaded rolling element is 0.8 ≦ A <1.0 when the diameter of the loaded rolling element is 1.0. Is preferably adopted.

  When the diameter of the non-loaded rolling element is smaller than the predetermined range (A <0.8), the efficiency with which the rolling element surface comes into contact when the unloaded rolling element frictionally contacts the loaded rolling element, the cage, and the inner and outer rings. This is not preferable because the lubrication performance is lowered and the rolling amount of the rolling element becomes unnecessarily large. In addition, a large diameter (A ≧ 1) that is equal to or greater than the predetermined range is not preferable because a high load is applied to the non-load rolling element more than necessary, which may cause cracks.

  The solid lubricant used in the present invention may be molybdenum disulfide as well as tungsten disulfide.

  In order to stably exhibit the above-described action for a longer time, a composite material containing a solid lubricant constituting the rolling element or a composite material forming a contact surface with at least the rolling element of the cage is a metal. It is preferable to use a composite material made of a sintered body in which a solid lubricant is dispersed in the material. Since the sintered body can hold a large amount of solid lubricant between the sintered metal particles inside, the supply amount of the solid lubricant can be increased, and the supply time can be maintained for a long time. is there.

  In addition, adopting a configuration in which the composite material containing the solid lubricant is a composite material made of a sintered body in which tungsten disulfide is dispersed in a tungsten alloy has excellent heat resistance as well as low torque durability. It is preferable for a solid lubricated rolling bearing.

In particular, the composite material containing the solid lubricant is preferably a composite material made of a sintered body in which 80% by volume or more of tungsten disulfide is dispersed in a tungsten alloy in order to further stabilize the above action. A guide roller formed of a sintered material containing less than 80% by volume of tungsten disulfide does not achieve the expected durability at a high temperature of 200 ° C. or higher, and the durability at such a high temperature is certain. Can not be obtained.
In the guide roller according to the present invention, during use, tungsten disulfide and other sulfides are supplied to the friction surface by an appropriate amount without interruption, so that the durability life of the bearing is extended.

  In addition, because the unloaded rolling element is made of a tungsten alloy-based sintered material that contains tungsten disulfide as a whole, even if the surface of the unloaded rolling element is worn down somewhat when used for a long time, tungsten disulfide, The supply of the solid lubricant composed of other sulfides to the friction surface is always stable without interruption, and the friction surface is sufficiently lubricated.

  As a guide roller as described above, a film stretching machine is a suitable application, that is, both edges facing the width direction of the belt-shaped film are each gripped by a tenter clip, and the width direction of the belt-shaped film is transferred as the belt-shaped film is transferred. The above-described guide roller can be applied to a film stretching machine in which a track for guiding the tenter clip is provided so as to widen the gripping interval and the guide roller guided by this track is provided integrally with the tenter clip.

  In other words, it can be said that the guide roller as described above can be applied to a tenter clip of a film stretching machine, that is, grips both edges in the width direction of the belt-shaped film transferred in the film stretching machine, and grips this. In the tenter clip that is guided along the track so as to widen the interval in the width direction and extends in the width direction of the strip film, a guide roller that is provided integrally with the tenter clip and guided to the track is referred to as the guide roller. It can be a tenter clip.

  As described above, since the guide roller of the present invention stabilizes the rotational torque at a low level from the start and stabilizes the running speed of the plurality of tenter clips, a stable stretching action from the start by using such a tenter clip. And a film stretching machine that can stably produce a homogeneous film without distortion.

Furthermore, the above-described guide roller can be a carriage provided on the vehicle body as a guide roller for article conveyance guidance.
The cart configured in this manner is a cart that can always move smoothly by stabilizing the rotational torque of the guide roller at a low level from the beginning of operation. Such a cart is an incinerator or sintering furnace that is particularly severe as a high temperature use condition. Can be used for conveying articles in a heated state.

  In the guide roller, the contact surface of the outer ring or the raceway of the roller is formed of a solid lubricant or a composite material containing the same, and at least one rolling element is made of a composite material containing the solid lubricant, and Since the surface of the cage is a solid-lubricated rolling bearing formed of a solid lubricant or a composite material containing the same, it does not contaminate the surrounding environment where the guide roller is used and does not degrade the quality of transported articles such as films. In addition, there is an advantage that the supply amount of the solid lubricant is sufficient even at the initial stage of operation of the solid lubricated rolling bearing, and the bearing rotational torque can be stabilized low from the initial stage of operation.

  In addition, the tenter clip guiding guide roller of the film stretching machine has an advantage that the rotational torque is stable at a low level from the start, and the traveling speed of the plurality of tenter clips can be stabilized constantly.

  Or there exists an advantage that the film extending machine which supports a tenter clip becomes what has a stable extending | stretching effect from the time of starting, and can produce a homogeneous film without distortion stably.

  Furthermore, a carriage provided with a guide roller for article conveyance guidance on the vehicle body becomes a carriage that can always move smoothly by stabilizing the rotational torque of the guide roller at a low level from the beginning of operation, or such a carriage is used under high temperature conditions. There is an advantage that it can be smoothly used for conveying articles even when used in a heated state in a particularly severe incinerator or sintering furnace.

  The guide roller according to the embodiment of the present invention is not particularly limited in type, type or size, and a typical example is a deep groove ball bearing. Embodiments of the guide roller of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, in the embodiment, for a plurality of rolling elements 4 that are rotatably held by a cage 3 between the inner ring 1 and the outer ring 2, the one or more rolling elements 4 contain a solid lubricant. This is a deep groove ball bearing type guide roller made of a composite material, and the cage 3 has at least a solid lubricant film 3a on the surface layer that forms a friction surface with the rolling element 4 on the surface. It is formed of a composite material containing an agent.
The cage 3 is formed not only of the solid lubricant film 3a on the surface layer including the contact surface with the rolling elements, but also the entire portion is formed of a composite material containing a solid lubricant regardless of the formation site or depth thereof. It may be.

  The plurality of ball-shaped rolling elements 4 includes a loaded rolling element 4a to which a bearing load is applied and one or more unloaded rolling elements 4b having a smaller diameter and not loaded with the bearing load. The non-loaded rolling element 4b is solid lubricated. It is preferably formed of a composite material containing an agent.

  In order to form the rolling element 4 with a composite material containing a solid lubricant, for example, a known solid lubricant is mixed in a sinterable metal matrix in a dispersed state, and the composite sintered material is formed into a polyhedral shape. It can be formed and then polished into a spherical shape by a barrel processing machine or the like. The diameter A of the unloaded rolling element is adjusted to 0.8 ≦ A <1.0 when the diameter of the loaded rolling element is 1.0, as described above, such as the contact efficiency of the rolling element. Is preferable.

The type of solid lubricant may be selected according to the application of the rolling bearing. For example, PTFE, which is a polymer compound, other fluorine compounds, or layered structure compounds such as molybdenum disulfide, graphite, boron nitride, and the like Examples of non-layered compounds include lead oxide (PbO), calcium fluoride (CaF ₂ ), and soft metals such as lead, tin, gold, silver, and copper.

  In order to form a surface including at least the contact surface with the rolling element of the cage 3 with a solid lubricant, the solid lubricant film 3a may be formed on the surface by a well-known technique. Specifically, such a solid lubricant film 3a can be formed by tumbling or sputtering. The solid lubricating film thus formed is difficult to peel off, is formed with a stable film thickness, and has a good lubricating performance from the beginning of starting.

  Further, in order to provide a composite material including a solid lubricant on the entire cage 3 or on a surface including at least a contact surface with the rolling element, the whole is sintered and molded using a powder sintered material containing a solid lubricant. Alternatively, composite sintering molding is performed only on the surface layer of the cage material.

  Examples of the sintered material suitable for the present invention include a sintered material using a tungsten alloy containing 80% by volume or more of tungsten disulfide, more preferably a tungsten alloy containing 90% by volume or more of tungsten disulfide. The thing formed with the sintered material using was mentioned.

  The metal matrix that is the main component in the sintered material of the composite material is tungsten disulfide, but other examples of the metal material contained include tungsten (W), copper (Cu), Tin (Sn), carbon (C), etc. are mentioned.

  The guide roller of the above embodiment is formed of a rolling element made of a composite material such as tungsten alloy containing a solid lubricant such as tungsten disulfide, and a surface made of a composite material such as tungsten disulfide or a tungsten alloy containing the same. Since the solid lubricant is supplied from both of the cages without interruption for a long time, a sufficient lubricating action is exerted by the transferred solid lubricant on the friction surfaces such as the inner and outer ring surfaces.

  A film stretching machine 11 shown in FIG. 4 uses the guide roller of the above-described embodiment as a guide roller for a tenter clip guide.

  The film stretching machine 11 includes means for performing the following steps together with an extruder 14 that melts the thermoplastic polymer compound 12 and extrudes it as an unstretched film 13 and a cooling drum 15 that receives the extruded film 13. ing.

That is, a feed roller 16 that feeds the film 13 cooled by the cooling drum 15, a water tank 17 that performs humidity conditioning on the film 13 that is fed by the feed roller 16, and the film 13 that has been humidity-conditioned by the water tank 17 are sandwiched. And a drainer 18 for removing water droplets on the surface.
Further, a biaxial stretching machine 19 that biaxially stretches the film 13 after the draining process in the longitudinal and lateral directions, and a collection roller 20 that winds up the film 13 formed by the biaxial stretching machine 19 are provided.

As shown in FIGS. 4 and 5, a transverse stretching device 30 is provided as a component of the biaxial stretching machine 19, and the transverse stretching device 30 is provided with a tenter clip 21.
As shown in FIGS. 5 and 6, the transverse stretching device 30 is disposed on both sides in the traveling direction of the belt-shaped film 13 that is sent, and the guide is disposed so that the rail interval gradually increases as the film 13 travels. Rails 22 and 23 are provided, and a plurality of tenter clips 21 that are connected to each other in a chain and circulate on the guide rails 22 and 23 in the traveling direction of the production line are provided.

The tenter clip 21 includes a grip portion 24 that elastically grips both edges facing the width direction of the film 13 with a spring force and the like, and a plurality of rolling bearings that roll on endless annular guide rails 22 and 23 by outer ring rotation. And guide rollers 25, 26, and 27.
That is, the tenter clip 21 advances in the traveling direction along the guide rails 22 and 23 in a state in which both edges in the width direction of the belt-like film 13 are gripped by the grip portion 24, and the film 13 is stretched in the width direction at that time. Has the effect of making

As shown in FIG. 6, the guide rollers 25 (25a, 25b, 25c, 25d), 26 (26a, 26b, 26c, 26d), 27 (27a, 27b, 27c, 27d) of the tenter clip 21 are directed upward, A plurality (four in the drawing) are provided in a downward and lateral direction as a set and are connected and integrated, and each set plays a role of rolling and guiding the guide rails 22 and 23.
The guide rollers 25 and 26 that roll on the guide surfaces facing the vertical direction of the guide rails 22 and 23 are attached to a fixed shaft (indicated by a one-dot chain line in FIG. 5) in the horizontal direction (lateral posture). The guide roller 27 that rolls on the guide surface in the vertical direction is attached to a fixed shaft (indicated by a one-dot chain line in FIG. 5) in the vertical direction (vertical posture).

  Each of these guide rollers 25 (25a, 25b, 25c, 25d), 26 (26a, 26b, 26c, 26d), 27 (27a, 27b, 27c, 27d) rotates the outer ring. Of the four guide rollers 25, 26, 27 each mounted on the fixed shaft in the horizontal posture and the vertical posture, each set 25b, 26b, 27b has a solid lubricating film 3a. The rolling bearing of the embodiment shown in FIGS. 1 to 3 is used.

  For the other guide rollers 25 (25a, 25c, 25d), 26 (26a, 26c, 26d), 27 (27a, 27c, 27d), the contact surfaces of the outer ring 2 with the guide rails 22, 23 are solid lubricated. A rolling bearing having the same configuration as that of the guide rollers 25b, 26b, and 27b is employed except that it is not formed of an agent or a composite material containing the agent.

  The film stretching machine that supports the tenter clip using the guide rollers 25, 26, and 27 does not scatter liquid lubricant from the contact surface with the outer ring or the track of the roller, and the surrounding environment in which the guide roller is used. There is no contamination and the quality of transported articles such as films does not deteriorate.

  In the film stretching machine, since the solid lubricant is supplied without interruption from both the rolling element and the cage, the friction surfaces such as the inner and outer ring surfaces are sufficiently lubricated, and the film stretching machine A stable stretching effect is produced from the start, and a homogeneous film without distortion can be stably produced.

  Needless to say, the guide rollers 25a, 25c, 25d, 26a, 26c, 26d, 27a, 27c, and 27d may have the same configuration as the guide rollers 25b, 26b, and 27b as appropriate. .

The second embodiment of the guide roller shown in FIG. 7 shows a guide roller 31 that can move along the track 29 by bringing a roller 28 provided integrally with the outer ring 2 of the rolling bearing into contact with the track 29 in a rotatable manner. is there.
Such a guide roller can be used for the tenter clip guide roller described above, and can also constitute a carriage 33 provided on the vehicle body 32 as an article conveyance guide guide roller.

  The roller 28 can be formed in a layered manner with the composite material containing the solid lubricant film 3a or the solid lubricant as described above only on the contact surface with the raceway 29, or contains the solid lubricant like the rolling element 4 described above. The composite material may be integrally molded as a molding material. When the roller 28 is formed of a metal such as a steel material, it can be fixed to the outer ring 2 by an interference fit or the like, or can be integrally formed integrally with the outer ring 2 using a sintered metal.

  The carriage configured as described above can be used for conveying articles even in a heated state such as 150 to 250 ° C. or higher in an incinerator or a sintering furnace, and has excellent heat resistance. Or it can be a trolley.

  A plurality of rolling elements of a deep groove ball bearing made of SUS440C (manufactured by NTN: SEB08) are a loaded rolling element (diameter 4 mm) to which a bearing load is applied and an unloaded rolling element (diameter 3.9 mm) to which the bearing load is not applied. The non-loaded rolling element is a sintered material in which 90% by volume or more of tungsten disulfide is dispersed in a tungsten alloy (Fuji Dice Corporation: FWD-CuCo with tungsten disulfide content of 90% by volume) Was polished into a spherical shape with a barrel processing machine to obtain an unloaded rolling element having the above-mentioned diameter.

One of the obtained unloaded rolling elements was incorporated in a cage, and the other rolling elements were ordinary rolling elements made of steel balls loaded with bearing load. The diameter A of the unloaded rolling element is 0.9 when the diameter of the loaded rolling element is 1.0, and the entire surface including the contact surface with the rolling element of the cage and the outer peripheral surface of the outer ring are the same as the rolling element. The entire surface including the friction surface was coated with molybdenum disulfide (MoS ₂ ) by sputtering, and these parts were assembled to produce the deep groove ball bearing type guide roller of Example 1.

In Example 1, the cage was prepared in exactly the same manner except that only the friction surface with the rolling element was coated with molybdenum disulfide (MoS ₂ ) by sputtering. Were assembled to produce a deep groove ball bearing type guide roller of Example 2.

  In Example 1, the cage is a cubic sintered material in which 90% by volume or more of tungsten disulfide is dispersed in a tungsten alloy (Fuji-Dies: FWD-CuCo, and the content of tungsten disulfide is 90% by volume. And a cage is prepared in the same manner as in Example 1, and the other parts are assembled to produce the deep groove ball bearing type guide roller of Example 3. did.

  In Example 3, the cage and the unloaded rolling element were made of a cubic sintered material in which 80% by volume of tungsten disulfide was dispersed in a tungsten alloy (Fuji-Dice Co., Ltd .: FWD-CuCo with tungsten disulfide content). 80% by volume) is manufactured by sintering molding, and other than that, a cage is prepared in exactly the same manner as in Example 3, and other parts are assembled and the deep groove ball bearing type of Example 4 is assembled. A guide roller was produced.

  With respect to the solid lubricated rolling bearings of Examples 1 to 4 obtained, when an experiment of intermittently starting in an atmosphere of 200 ° C. under the condition of outer ring rotation was repeatedly performed, the bearing rotational torque can be stabilized low from the initial stage of operation. There was found. In addition, it was confirmed that under the condition that the outer ring is rotated on the steel track, the solid lubricant dust is not scattered and the surrounding environment is not polluted.

The principal part top view of the guide roller which shows embodiment Sectional drawing of the principal part of the guide roller which shows embodiment Cross section of FIG. Schematic configuration diagram of an embodiment film stretching machine Sectional drawing which shows the tenter clip periphery part of the film stretching machine of embodiment Sectional view taken along line VI-VI in FIG. Sectional drawing which shows the guide roller periphery part of the trolley | bogie of embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Cage 3a Solid lubricating film 4 Rolling element 4a Loaded rolling element 4b Unloaded rolling element 11 Film stretching machine 12 Thermoplastic polymer compound 13 Film (raw sheet)
14 Extruder 15 Cooling drum 16 Feeding roller 17 Water tank 18 Draining device 19 Biaxial stretching machine 20 Recovery roller 21 Tenter clip 22, 23 Guide rail 24 Clip portions 25, 26, 27, 31 Guide roller 28 Roller 29 Track 30 Horizontal stretching device 32 body 33 trolley

Claims (9)

In a guide roller that can move along the raceway by rotating an outer ring of a rolling bearing or a roller provided integrally therewith to the raceway in a freely rotating manner,
One or more of a plurality of rolling elements that are formed of a solid lubricant or a composite material containing the same in contact with the outer ring or the raceway of the roller and that are rotatably held between the outer ring and the inner ring by a cage. A rolling roller is formed of a solid lubricant-containing composite material, and a surface including at least a contact surface with the rolling element of the cage is formed of a solid lubricant or a composite material containing the same.   The plurality of rolling elements are composed of a loaded rolling element to which a bearing load is applied and a non-loaded rolling element having a smaller diameter and not loaded with a bearing load, wherein at least one or more non-loaded rolling elements contain a solid lubricant. The guide roller according to claim 1, comprising:   The guide roller according to claim 1 or 2, wherein the solid lubricant is tungsten disulfide or molybdenum disulfide.   The guide roller according to any one of claims 1 to 3, wherein the composite material containing the solid lubricant is a composite material made of a sintered body in which the solid lubricant is dispersed in a metal material.   The guide roller according to claim 4, wherein the composite material containing the solid lubricant is a composite material made of a sintered body in which tungsten disulfide is dispersed in a tungsten alloy. A guide that guides the tenter clip is provided so that both edges facing the width direction of the belt-shaped film are each gripped by the tenter clip, and the gripping interval in the width direction is widened with the transport of the belt-shaped film. In a film stretching machine in which a roller is provided integrally with the tenter clip,
A film stretching machine, wherein the guide roller is the guide roller according to claim 1. In the tenter clip that grips both edges in the width direction of the belt-shaped film transferred in the film stretching machine and is guided in a track so as to widen the gap in the width direction of gripping and stretches the width direction of the belt-shaped film,
A tenter clip for a film stretching machine, wherein the guide roller provided integrally with the tenter clip and guided along a track is the guide roller according to any one of claims 1 to 5.   A cart for conveying an article provided with the guide roller according to claim 1.   The cart according to claim 8, wherein the cart is used in a heated state in an incinerator or a sintering furnace.

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