Silicone oil application device

Abstract

To provide a silicon oil coating device which can coat required amount of silicone oil on an outer diameter surface of a headrest stay at a lower end side through simple operations.SOLUTION: A silicon oil coating device 1 coating silicon oil S on outer diameter surfaces of a pair of stays 52 of a head rest 5 comprises: a silicon oil tank 2; an elevating member 3 which holds a head rest 5 to put lower end part 53 side portions of the stays 52 in and out through the opening 2a of the silicon oil tank 2; a lid body 21 arranged at the opening 2a with flexible rubber plate 21b which has a stay through hole 21b1 through which the stays 52 are passed in a pressure contact state; and a plurality of rollers 23 which are arranged below the lid body 21 being rotatable around a shaft extending in a vertical direction in accompany with vertical motion of the elevating member 3, and contacts with any of the stays 52 to rotate while containing the silicon oil S so that the silicon oil S can be coated on an outer diameter surface of the stay 52.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a silicone oil applicator, and more particularly to a silicone oil applicator that applies silicone oil to the surface of a headrest stay. [Background technology]

[0002] In a conventional vehicle seat equipped in a vehicle such as an automobile, a headrest is attached by inserting a pair of headrest stays into headrest supports, which are a pair of tubular members disposed on the upper side of the seat back. In this case, during the manufacturing process of the vehicle seat, when inserting the pair of headrest stays into the inner diameter portions of the pair of headrest supports, silicone oil is applied to the outer diameter surface of each headrest stay before insertion to improve sliding properties and make insertion easier. To apply the silicone oil, as described in Patent Document 1, a dipping method is sometimes used in which the lower portion of each headrest stay is immersed in a tank containing silicone oil. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-287738 Summary of the Invention [Problem to be solved by the invention]

[0004] In the application of silicone oil to the headrest stay by dipping as described in Patent Document 1, there is a risk of problems such as excess silicone oil adhering to the outer and inner diameter surfaces of the headrest stay dripping and contaminating the floor. There is also a problem of silicone oil being wasted by applying silicone oil to the inner diameter surface where application is not required. Therefore, there has been a demand for a device that can apply the required amount of silicone oil only to the outer diameter surface of the headrest.

[0005] In view of such demands, an object of the present invention is to provide a silicone oil application device that can apply a required amount of silicone oil to the outer diameter surface of the lower end side of a headrest stay with a simple operation. [Means for solving the problem]

[0006] The first invention of the present invention is a silicone oil application device that applies silicone oil to the outer diameter surfaces of the tip-side portions of a pair of stays that protrude from the main body of a headrest, and is characterized by comprising: a silicone oil tank that contains silicone oil and has an opening at the top; a lifting member that holds the headrest and moves the tip-side portions of the pair of stays of the headrest into and out of the silicone oil tank from above through the opening of the silicone oil tank; a lid body that is installed in the opening and has a flexible pressure-contact member attached thereto and has stay-passing holes through which the pair of stays pass in a pressure-contact state; and a plurality of rollers that are arranged below the lid body inside the silicone oil tank so as to be rotatable about an axis that extends in the vertical direction in conjunction with the up and down movement of the lifting member, and that contain the silicone oil and are able to apply the silicone oil to the outer diameter surfaces of the pair of stays by rotating in contact with one of the pair of stays.

[0007] According to the first aspect of the present invention, when the headrest held by the lifting member is lowered relative to the silicone oil vat and the tip end portions of the pair of stays are inserted into the silicone oil vat while pushing and widening the stay-passing holes of the pressure contact members attached to the lid, multiple rollers containing silicone oil come into contact with one of the pair of stays and rotate. This causes silicone oil to be applied to the outer diameter surfaces of the tip end portions of the pair of stays. Then, when the headrest held by the lifting member is moved upward, the tip end portions of the pair of stays are pulled out while being pressed by the pressure contact members around the stay-passing holes of the pressure contact members attached to the lid, so any excess silicone oil is scraped off to an appropriate amount. This allows the silicone oil applicator to apply the required amount of silicone oil to the tip end portions of the pair of stays with the simple operation of raising and lowering the headrest held by the lifting member relative to the silicone oil vat.

[0008] The second invention of the present invention is characterized in that, in the first invention, the silicone oil tank has a pump inside that is activated by the lifting and lowering action of the lifting member and draws up a predetermined amount of the silicone oil stored inside the silicone oil tank and supplies it to the top of at least one of the rollers in a group of rollers that contacts one of the pair of stays among the plurality of rollers.

[0009] According to the second invention, the silicone oil stored inside the silicone oil tank is supplied to the top of at least one roller in the group of rollers that contacts one of a pair of stays in the plurality of rollers by a pump operated by the lifting and lowering movement of the lifting member, thereby eliminating the need to manually pump up the silicone oil stored inside the silicone oil tank and supply it to the plurality of rollers.

[0010] The third invention of the present invention is characterized in that, in the second invention, the lid body is provided with an oil supply passage having one end opening toward the pump and the other end opening to the top of at least one of the rollers in the group of rollers, and the oil discharge port of the pump and the one end of the oil supply passage are connected by a flexible hose.

[0011] According to the third invention, the silicone oil is supplied to the top of at least one roller in the group of rollers that contacts one of a pair of stays among the multiple rollers through an oil supply passage provided in the lid body, so there is no need to arrange piping or the like for supplying the silicone oil outside the lid body, resulting in a simple structure.

[0012] A fourth aspect of the present invention is characterized in that, in the second or third aspect of the invention, each of the plurality of rollers has a pinion gear arranged at its lower part and coaxial with the shaft, the pinion gear of one of the rollers, that is, a start roller, meshes with a rack gear that moves horizontally as the lifting member moves up and down, and the pinion gears of the rollers in each of the roller groups other than the start roller are meshed so as to rotate together with the rotation of the pinion gear of the start roller, the rack gear is biased in one horizontal direction and is connected to the lifting member by a string-like body so as to move in the other direction against the biasing force when the lifting member rises and move in the one direction due to the biasing force when the lifting member descends.

[0013] According to the fourth aspect of the present invention, when the lifting member is lowered, the rack gear moves horizontally in one direction due to the biasing force, rotating the pinion gear of the activation roller in each roller group. Accordingly, the pinion gears of the rollers other than the activation roller in each roller group rotate, causing all the rollers in each roller group to rotate and apply silicone oil to each of the pair of stays. When the lifting member is then raised, all the rollers in each roller group rotate in the opposite direction to when the lifting member is lowered, applying silicone oil to each of the pair of stays. In this way, it is possible to apply silicone oil to the outer diameter surfaces of the tip end portions of the pair of stays using a simple mechanism that does not use power. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic front view illustrating a silicone oil application device according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a top view of the silicone oil tank of the embodiment. [Figure 3] 5 is a top view illustrating the roller operating mechanism in the embodiment. FIG. [Figure 4] FIG. 2 is a view corresponding to FIG. 1, illustrating a state in which a headrest stay is inserted into the silicone oil tank of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] A silicone oil application device 1 according to one embodiment of the present invention will be described with reference to Figures 1 to 4. In the following description, directions will be described based on the up, down, front, back, left, and right directions shown in each figure. Here, the up, down, front, back, left, and right directions are defined based on the operator who faces the silicone oil application device 1 and operates it.

[0016] First, we will explain the headrest 5 to which silicone oil is applied. As shown in FIG. 1, the headrest 5 has a main body 51, which has a structure in which a frame body forming a framework is covered with a cushion body and a cover body is placed on top of that, and a pair of left and right stays 52 arranged to extend downward from the underside of the main body 51. The main body 51 is a member that abuts against the head of a seated occupant and elastically supports it. The stays 52 are formed from a cylindrical metal pipe with a plated surface, and a lower end 53, which is the end opposite the main body 51, is tapered. The headrest 5 is attached to the upper part of the seatback by inserting each stay 52 from the lower end 53 side into the inner diameter portions of a pair of left and right cylindrical headrest supports (not shown) arranged inside the upper part of the seatback. Here, during the seat manufacturing process, a silicone oil application device 1 is used to apply silicone oil to the outer diameter portions of each stay 52 near the lower end 53 to make it easier to insert each stay 52 into the inner diameter portions of the pair of left and right headrest supports. Silicone oil is a type of silicone that has a relatively small molecular weight and is oily at room temperature, and is widely used as a friction reducer and lubricant for machinery. Here, the lower end 53 corresponds to the "tip" in the claims.

[0017] As shown in Figures 1 and 2, the silicone oil application device 1 has a silicone oil tank 2 that is open at the top, a plate-shaped lifting member 3 that moves up and down relative to the silicone oil tank 2, and a connecting member 4 that connects the lifting member 3 to the silicone oil tank 2 so that it can move up and down.

[0018] 1 and 2, the silicone oil tank 2 has a rectangular box shape with a rectangular opening 2a at the top with its long axis extending left to right. A bottom surface 2b of the same shape as the opening 2a is formed on the lower side opposite the opening 2a. Silicon oil S is stored above the bottom surface 2b inside the silicone oil tank 2.

[0019] A thick resin lid 21 is attached to the inside of the center of the opening 2a at the top of the silicone oil tank 2 in the left-right direction. The top surface of the lid 21 is flush with the surface of the opening 2a of the silicone oil tank 2. A pair of left and right circular holes 21a with circular cross sections are formed in the lid 21 in the vertical direction. A flexible and elastically deformable rubber plate 21b is disposed inside the circular hole 21a. The stay-through hole 21b1 has an inner diameter slightly smaller than the outer diameter of the stay 52 at its center. The left-right dimension between the centers of the left and right stay-through holes 21b1 is the same as the left-right dimension between the central axes of the pair of left and right stays 52. A cylindrical horizontal supply hole 21c extending in the left-right direction is formed inside the front side of the lid 21. Vertical supply holes 21d are formed inside the left and right sides of the lid 21, communicate with the horizontal supply holes 21c, extend downward, and open to the underside of the lid 21. When silicone oil S is injected through inlet 21c1 of horizontal supply hole 21c, which opens on the left side of lid 21, the silicone oil S passes through horizontal supply hole 21c and is discharged downward from left and right vertical supply holes 21d of lid 21. Here, rubber plate 21b and inlet 21c1 correspond to the "pressure contact member" and "one end" in the claims, respectively. Furthermore, horizontal supply hole 21c and vertical supply hole 21d correspond to the "oil supply path" in the claims.

[0020] A pump 22 is disposed inside the silicone oil tank 2 on the left side of the lid 21. When the head 22a is pressed from above, the pump 22 discharges the silicone oil S stored therein from the discharge port 22c. When the pressure on the head 22a is released, the head 22a returns upward due to the biasing force, sucking the silicone oil S stored inside the silicone oil tank 2 and storing it inside. The head 22a is pressed by the lower end surface of the pump pressing portion 33 (described later) when the lifting member 3 descends. The discharge port 22c of the head 22a and the inlet 21c1 of the lid 21 are connected by a flexible hose 22d, and when the head 22a is pressed, the silicone oil S is supplied to the inlet 21c1 of the lid 21. Here, the discharge port 22c corresponds to the "oil discharge port" in the claims.

[0021] As shown in Figures 1 to 3, three rollers 23 are arranged on each of the left and right sides inside the silicone oil tank 2. The rollers 23 are cylindrical coating rollers with an outer diameter surface formed like a short-haired brush. The three rollers 23 on the left side are used to apply silicone oil S to the left stay 52 of the headrest 5, and the three rollers 23 on the right side are used to apply silicone oil S to the right stay 52 of the headrest 5. Since all of them have the same structure, the three rollers 23 on the left side will be described as representative. Here, the three rollers 23 on the left side and the three rollers 23 on the right side each correspond to a "group of rollers" in the claims.

[0022] As shown in FIGS. 1 to 3, the rear roller 23a is rotatable about a vertically extending shaft 23a1 fixed to the bottom surface 2b of the silicone oil tank 2. A pinion gear 23a2 fixed to the lower portion of the rear roller 23a is meshed with a rack gear 24, the tooth surface of which extends in the left-right direction and faces forward. The front roller 23c is rotatable about a vertically extending shaft 23c1 fixed to the bottom surface 2b of the silicone oil tank 2. A pinion gear 23c2 fixed to the lower portion is meshed with the pinion gear 23a2 of the rear roller 23a. The middle roller 23b, located in the center in the front-to-rear direction, is rotatable about a vertically extending shaft 23b1 fixed to the bottom surface 2b of the silicone oil tank 2. A pinion gear 23b2 fixed to the lower portion is meshed with the pinion gear 23a2 of the rear roller 23a. As a result, when rack gear 24 moves rightward, rear roller 23a rotates counterclockwise about shaft 23a1 in Fig. 3, and accordingly, front roller 23c rotates clockwise about shaft 23c1, and middle roller 23b rotates clockwise about shaft 23b1. When rack gear 24 moves leftward, rear roller 23a rotates clockwise about shaft 23a1 in Fig. 3, and accordingly, front roller 23c rotates counterclockwise about shaft 23c1, and middle roller 23b rotates counterclockwise about shaft 23b1. 3, when the left stay 52 of the headrest 5 is positioned in the center of the triangle formed by the shafts 23a1, 23b1, and 23c1, the shafts 23a1, 23b1, and 23c1 are arranged so that the outer diameter portions of the rear roller 23a, middle roller 23b, and front roller 23c are in pressure contact with the outer diameter surface of the stay 52. ​​The shafts 23a1, 23b1, and 23c1 are also arranged so that the outer diameter portions of the middle roller 23b and front roller 23c are in pressure contact with the outer diameter portion of the rear roller 23a. The rack gear 24 is arranged to be movable in the left-right direction parallel to the bottom surface 2b while meshing with the pinion gears 23a2 of the left and right rear rollers 23a, and is biased rightward by a tension coil spring 24a arranged between the right end of the rack gear 24 and the inside of the right wall surface of the silicone oil tank 2.A string-like body 24b, one end of which is fixed to the left end of the rack gear 24, is looped from below around a fixed pulley 24c, which is rotatably attached to the silicone oil tank 2 around an axis extending in the front-to-rear direction, and the other end of which is fixed to the underside of the lifting member 3. As a result, when the lifting member 3 is lowered, the rack gear 24 moves to the right by the biasing force of the tension coil spring 24a, causing each roller 23 to rotate. At this time, the outer diameter portion of each roller 23, soaked in silicone oil S, presses against the outer diameter surface of the stay 52 and rotates, allowing silicone oil S to be applied to the outer diameter surface of the lower portion of the stay 52. ​​Here, the rear roller 23a corresponds to the "starting roller" in the claims, and the middle roller 23b and the front roller 23c each correspond to the "rollers other than the starting roller" in the claims.

[0023] As shown in FIG. 1 , the lifting member 3 is formed with a pair of left and right stay holes 31 in the left-right center at positions corresponding to the pair of left and right stay through-holes 21b1 of the lid 21 attached to the silicone oil tank 2, through which a pair of left and right stays 52 of the headrest 5 pass to hold the headrest 5 on the lifting member 3. The lifting member 3 also has a pair of left and right rod-shaped member holes 32 on its left and right ends, through which rod-shaped members 41 pass. The lifting member 3 also has a cylindrical pump pressing portion 33 extending downward at a position on its underside corresponding to the head portion 22a of the pump 22. The vertical dimension of the lower end surface of the pump pressing portion 33 from the underside of the lifting member 3 is such that when the lifting member 3 descends and its lower surface abuts against the upper surface of the lid 21, the lower end surface of the pump pressing portion 33 presses against the head portion 22a of the pump 22, causing a predetermined amount of silicone oil S to be discharged from the discharge port 22c.

[0024] As shown in FIG. 1 , the connecting member 4 includes a pair of cylindrical rod-shaped members 41 on the left and right sides and a pair of compression coil springs 42 arranged coaxially with the rod-shaped members 41. The rod-shaped members 41 are attached to brackets 43, which extend outward from the left and right sides of the silicone oil tank 2, with their lower ends extending upward. Each rod-shaped member 41 is arranged with its corresponding compression coil spring 42 arranged coaxially. The male-threaded upper end of each rod-shaped member 41 is inserted into each rod-shaped member hole 32 of the lifting member 3, and a nut 44 is tightened to slightly compress the compression coil spring 42. In this state, the lifting member 3 is biased upward and positioned at a predetermined height.

[0025] The present embodiment configured as described above operates as follows. First, as shown in FIG. 1 , the stays 52 of the headrest 5 are inserted into the stay holes 31 of the lifting member 3 from above, starting from the lower end 53, until the lower surface of the main body 51 abuts against the upper surface of the lifting member 3. In this state, when the main body 51 of the headrest 5 is pressed downward, the stays 52 enter the stay-passing holes 21b1 of the rubber plate 21b of the lid 21 from the lower end 53 side while pushing and widening the stay-passing holes 21b1. Then, as shown in FIG. 3 , the stays 52 enter the spaces between the rear roller 23a, the middle roller 23b, and the front roller 23c from the lower end 53 side. When the lower surface of the lifting member 3 abuts against the upper surface of the lid 21, the stays stop descending, reaching the state shown by the solid line in FIG. 4 . At this time, the rack gear 24 is gradually moved rightward by the biasing force of the tension coil spring 24a as the pulling force of the string-like body 24b to the left is gradually released. 3, as the rack gear 24 moves rightward, the rear rollers 23a rotate counterclockwise about their respective shafts 23a1, and in conjunction with this, the middle rollers 23b rotate clockwise about their respective shafts 23b1, and the front rollers 23c rotate clockwise about their respective shafts 23c1. At this time, since the silicone oil S has permeated the rollers 23, the rollers 23 rotate while pressing against the outer diameter surface of the stays 52, thereby applying the silicone oil S to the outer diameter surface of each stay 52. ​​At the same time, the head portion 22a of the pump 22 is pressed by the lower end surface of the pump pressing portion 33 of the elevating member 3, so that the silicone oil S stored in the pump 22 is supplied to the front rollers 23c through the horizontal supply hole 21c and the vertical supply hole 21d. Next, when the force pressing the main body 51 of the headrest 5 downward is removed, the lifting member 3 rises due to the action of the compression coil spring 42 and returns to the state shown in FIG. 1 (the state shown by the two-dot chain line in FIG. 4). At this time, the rack gear 24 is pulled leftward by the string-like body 24b and gradually moves leftward against the biasing force of the tension coil spring 24a. As the rack gear 24 moves leftward, the rear rollers 23a rotate clockwise about their respective shafts 23a1 in FIG. 3. In conjunction with this, the middle rollers 23b rotate counterclockwise about their respective shafts 23b1, and the front rollers 23c rotate counterclockwise about their respective shafts 23c1.At this time, since the silicone oil S has soaked into each roller 23, each roller 23 rotates while pressing against the outer diameter surface of each stay 52, and therefore the silicone oil S is applied to the outer diameter surface of each stay 52. ​​Then, when each stay 52 is pulled upward from each stay-passing hole 21b1 of the rubber plate 21b, the rubber plate 21b around each stay-passing hole 21b1 is in pressure contact with the outer diameter surface of each stay 52, and therefore excess silicone oil S adhering to the outer diameter surface of each stay 52 is scraped off and collected in the silicone oil tank 2. As each roller 23 rotates due to the elevation of the elevation member 3, each front roller 23c and each rear roller 23a rotate with their outer diameter surfaces pressed against each other, and therefore the silicone oil S that has soaked into each front roller 23c is also transferred to each rear roller 23a. Furthermore, since the rear rollers 23a and the middle rollers 23b rotate with their outer diameter surfaces pressed against each other, the silicone oil S soaked into each rear roller 23a is also transferred to each middle roller 23b. As the lifting member 3 repeatedly moves up and down, each of the rear rollers 23a, middle rollers 23b, and front rollers 23c is maintained in a state in which the silicone oil S has soaked into them.

[0026] The present embodiment configured as described above provides the following advantageous effects. When the headrest 5 held by the lifting member 3 is lowered relative to the silicone oil tank 2, and the portions of the pair of stays 52 on the side of the lower end portions 53 thereof are inserted into the silicone oil tank 2 while pushing and widening the stay-passing holes 21b1 of the rubber plates 21b, the rollers 23 containing the silicone oil S come into contact with one of the pair of stays 52 and rotate. This causes the silicone oil S to be applied to the outer diameter surfaces of the portions of the pair of stays 52 on the side of the lower end portions 53 thereof. When the headrest 5 held by the lifting member 3 is moved upward, the portions of the pair of stays 52 on the side of the lower end portions 53 thereof are pulled out while being pressed by the rubber plates 21b around the stay-passing holes 21b1 of the rubber plates 21b, so that any excess silicone oil S is scraped off to an appropriate amount. This allows the silicone oil application device 1 to apply the required amount of silicone oil S to the portions of the pair of stays 52 on the side of the lower end portions 53 by a simple operation of raising and lowering the headrest 5 held by the lifting member 3 relative to the silicone oil tank 2.

[0027] Furthermore, the pump 22, which is actuated by the lifting and lowering action of the lifting member 3, supplies the silicone oil S stored inside the silicone oil tank 2 to each front roller 23c, eliminating the need to manually pump up the silicone oil S stored inside the silicone oil tank 2 and supply it to each roller 23.

[0028] Furthermore, since the silicone oil S is supplied to each front roller 23c through the horizontal supply hole 21c and each vertical supply hole 21d provided in the lid body 21, there is no need to arrange piping or the like for supplying the silicone oil S outside the lid body 21, resulting in a simple structure.

[0029] In addition, when the lifting member 3 is lowered, the rack gear 24 moves rightward due to the biasing force of the tension coil spring 24a, causing the pinion gear 23a2 of each rear roller 23a to rotate. Accordingly, the pinion gear 23b2 of each middle roller 23b and the pinion gear 23c2 of each front roller 23 rotate, applying silicone oil S to each of the pair of stays 52. When the lifting member 3 is then raised, all of the rollers 23 rotate in the opposite direction to when the lifting member 3 is lowered, applying silicone oil S to each of the pair of stays 52. In this way, it is possible to apply silicone oil S to the outer diameter surfaces of the portions of the pair of stays 52 on the side of the lower end portions 53 using a simple mechanism that does not use power.

[0030] Although specific embodiments have been described above, the present invention is not limited to those external appearances and configurations, and various modifications, additions, and deletions are possible within the scope of the present invention. For example, the following can be mentioned.

[0031] 1. In the above embodiment, the lowering of the lifting member 3 is determined to occur when the lower surface of the lifting member 3 abuts against the upper surface of the lid body 21. However, this is not limiting, and a spacer can be disposed between the lower surface of the lifting member 3 and the upper surface of the lid body 21 to adjust the lowering distance of the lifting member 3.

[0032] 2. In the above embodiment, the headrests 5 are set by inserting the stays 52 one by one into the stay holes 31 of the lifting member 3. However, this is not limiting, and the headrests 5 can be arranged side by side with the stays 52 facing downwards on a slope that slopes in the direction in which the stay holes 31 extend, with each stay 52 of the headrest 5 being configured to be inserted sequentially into each stay hole 31 by gravity, making it easier to attach the headrests 5 to the lifting member 3. [Explanation of symbols]

[0033] 1 Silicone oil application device 2 Silicone oil tanks 2a opening 3 Lifting member 4 Connecting members 5 Headrest 21 Lid 21b Rubber plate (pressure welding member) 21b1 Stay hole 21c Horizontal supply hole (oil supply passage) 21c1 Inlet (one end) 21d Vertical supply hole (oil supply passage) 22d flexible hose 22 Pump 22c Outlet (oil outlet) 23 Laura 23a Rear roller (starting roller) 23a1 axis 23a2 pinion gear 23b Middle Roller 23b1 axis 23b2 pinion gear 23c Front roller 23c1 axis 23c2 pinion gear 24 Rack Gear 24a tension coil spring 24b String-like body 51 Main body 52 Stay 53 Lower end (tip) S Silicone oil

Claims

1. A silicone oil application device that applies silicone oil to outer diameter surfaces of portions of a pair of stays protruding from a main body of a headrest, the portions being on the side of the tip ends of the stays, a silicone oil tank containing silicone oil and having an opening at the top; a lifting member that holds the headrest and moves the tip end portions of the pair of stays of the headrest into and out of the silicone oil tank from above through the opening of the silicone oil tank; a lid body to which a flexible pressure-contact member is attached, the lid body having stay-passing holes through which the pair of stays are passed in a pressure-contact state and which is installed in the opening; a plurality of rollers that are arranged below the lid inside the silicone oil tank and are rotatable about an axis that extends in the vertical direction in conjunction with the up and down movement of the lifting member, and that contain the silicone oil and rotate in contact with one of the pair of stays to apply the silicone oil to the outer diameter surfaces of the pair of stays.

2. In claim 1, The silicone oil application device has a pump inside the silicone oil tank that is operated by the lifting and lowering action of the lifting member to draw up a predetermined amount of the silicone oil stored inside the silicone oil tank and supply it to the top of at least one of the rollers in a group of rollers that contacts one of the pair of stays among the multiple rollers.

3. In claim 2, the cover is provided with an oil supply passage having one end opening toward the pump and the other end opening to an upper portion of at least one of the rollers in the roller group; The silicone oil application device has an oil discharge port of the pump and the one end of the oil supply path connected by a flexible hose.

4. In claim 2 or claim 3, A pinion gear is disposed coaxially with the shaft at the bottom of each of the rollers, the pinion gear of a start roller, which is one of the rollers in the roller group, meshes with a rack gear that moves horizontally due to the up and down movement of the lifting member, and the pinion gears of the rollers other than the start roller in each of the roller groups are meshed with each other so as to rotate together with the rotation of the pinion gear of the start roller, The rack gear is biased in one horizontal direction, The silicone oil application device is connected to the lifting member by a string-like body so that when the lifting member rises, it moves in the other direction against the biasing force, and when the lifting member falls, it moves in the one direction due to the biasing force.

Images