Sealing tape winding device

Abstract

To provide a seal tape winding apparatus in which a screw roller smoothly rotates when winding a seal tape and good seal winding can be performed regardless a workpiece size.SOLUTION: In a seal tape winding apparatus 1, a screw portion Wa of a workpiece W in which the screw portion Wa is formed on at least one end is caused to place in a workpiece space S between a drive roller 10 and a pair of screw rollers 11, 11 to move a tip end of a seal tape T to move so as to be placed between the workpiece W and the drive roller 10, is caused to move the screw roller 11 disposed on a roller mounting base 12 to move along with the roller mounting base 12, to press the workpiece W to the drive roller 10, and causes the seal tape T set by rotating the workpiece W and the screw roller 11 with rotation of the drive roller 10 to be wound around the screw portion Wa. An annular slide member 4 is interposed between the roller mounting base 12 and the screw roller 11.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a sealing tape winding device for winding a sealing tape around a threaded portion of a hollow workpiece having a threaded portion formed at one end thereof. [Background technology]

[0002] The applicant has developed an automatic sealing tape winding machine that winds sealing tape around hollow workpieces, such as the male threads of tapered thread joints for pipes, in order to reduce the labor required for manual winding of sealing tape and the variation in winding quality caused by manual work.

[0003] The automatic sealing tape winding machine manually moves the workpiece to the device and winds the sealing tape around the threaded portion of the workpiece, and as shown in Fig. 9, positions the threaded portion Wa of the hollow cylindrical workpiece W in the working space S between the drive roller 10 and the screw rollers 11, 11, and presses it with the screw rollers 11, 11 so that the sealing tape is interposed between the drive roller 10. Then, as the screw portion Wa is pressed against the drive roller 10, the screw portion Wa is rotated in accordance with the rotation of the drive roller 10. As a result, the sealing tape T sent between the drive roller 10 and the screw portion Wa is wound around the screw portion Wa of the workpiece W (see Patent Document 1).

[0004] However, with this device, the worker must hold the workpiece, which can cause it to drop during operation, and so the operation takes time. Therefore, a sealing tape winding device that automatically transports the workpiece to the work space S was developed.

[0005] The operation of the sealing tape winding device 100 will be briefly described with reference to Fig. 6 to Fig. 8. First, as an initial state, as shown in Fig. 6, the tape holder 7 is fixed at the upper position farthest from the drive roller 10. The guide portion 60 of the tape guide 6 extending from the sealing tape outlet is located above the cutting unit 8. At this time, the tension unit 5 and the moving mechanisms 52, 83 of the cutting unit 8 are in a state in which the rods enter the cylinders, and the tension bar 50 and the flange 80 are located at the rightmost position in the figure. In this state, the sealing tape T is attached to the guide portion 60, and the sealing tape T is configured to move forward and backward (moving up and down in the figure) with the tip portion of the sealing tape T extending from the guide portion 60 by a predetermined length.

[0006] Next, the control unit (not shown) moves the tape holder 7 downward, thereby moving the entire tape guide 6 downward, and positions the tip of the sealing tape T extending from the guide portion 60 in contact with or close to the peripheral surface of the drive roller 10 (see Figure 7(a)).

[0007] Then, the workpiece W is positioned in the working space S by an automatic workpiece W supply device (not shown), and the slide unit 14 is operated to move the screw roller 11, so that the workpiece W is held by the drive roller 10 and the screw rollers 11, 11, and the seal tape T is interposed between the workpiece W and the drive roller 10. After that, the guide part 60 is raised to the vicinity of the cutting unit 8, and the moving mechanism 52 of the tension unit 5 is operated. By operating the tension unit 5, the seal tape T is pressed against the screw roller 11 by the pressing part 50a at the tip of the tension bar 50. As a result, tension is applied to the seal tape T between the workpiece W and the drive roller 10 and the guide part 60, and the same force is applied to the seal tape T as when the seal tape T is manually wound around the screw part of the workpiece W (see FIG. 7(b)).

[0008] In the state shown in FIG. 7(b), the winding operation starts, followed by an initial low-speed winding and then a high-speed winding.

[0009] 8, the tape guide 6 is moved above the cutting unit 8 to operate the cutting unit 8. Then, almost simultaneously with the cutting operation, the drive roller 10 is rotated at high speed to wind the excess portion of the sealing tape T around the threaded portion of the workpiece W. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Special Publication No. 55-18233 [Patent Document 2] JP 2020-70190 A Summary of the Invention [Problem to be solved by the invention]

[0011] However, in the sealing tape winding device described in Patent Document 2, the thread of the screw roller 11 that comes into contact with the workpiece W as the slide unit 14 moves is almost never in a position that completely matches the thread of the workpiece W. Therefore, the screw roller 11 rotates slightly while a force is applied parallel to the axis, and the thread of the screw roller 11 is forcibly engaged with the thread of the workpiece W. For this reason, the screw roller 11 may be pressed against the roller mount 12. In such a case, when the screw roller 11 rotates in accordance with the rotation of the drive roller 10, frictional resistance between the roller mount 12 and the screw roller 11 increases, which may cause rotation failure. The effect of rotation failure is particularly noticeable when the size of the workpiece W is relatively large.

[0012] The present invention has been made in consideration of the above points, and its object is to provide a sealing tape winding device that allows the screw roller to rotate smoothly when winding the sealing tape, and can wind a good seal regardless of the work size. [Means for solving the problem]

[0013] The tape winding device of the present invention, which has been made to solve the above-mentioned problems, positions the threaded portion of a workpiece, which has a threaded portion formed at at least one end, in the working space between a drive roller and a pair of screw rollers, moves the screw roller arranged on a roller mounting base so that a sealing tape is interposed between the workpiece and the drive roller, presses the workpiece against the drive roller, and winds the sealing tape that is fed out by rotating the workpiece and the screw roller in response to the rotation of the drive roller, and is arranged to have a circular sliding member interposed between the roller mounting base and the screw roller.

[0014] Even if the screw roller is biased toward the roller mounting base when the workpiece is fixed, this tape winding device allows the screw roller to rotate smoothly without generating frictional resistance due to the sliding member, making it possible to wind the sealing tape well even around large workpieces.

[0015] In this case, the screw roller has a roller body having a threaded portion on its peripheral surface that engages with the thread of the workpiece and an insertion hole formed in the axial direction; a shaft-shaped mounting member that is inserted into the insertion hole and that rotatably mounts the roller body to the roller mounting base; The mounting member is composed of a shaft portion, a threaded portion formed at a tip of the shaft portion, and a head portion having a larger diameter than the shaft portion at the other end, The insertion opening may be formed with a step portion so that the diameter is larger on the side opposite the roller mounting base, and an elastic member may be disposed between the inner annular end face of the head portion and the step portion.

[0016] Furthermore, in this case, a step may be formed in the insertion opening so that the roller mounting base side has a larger diameter, and an elastic member may be disposed between the sliding member and the step.

[0017] In these cases, the sliding member may be a thrust bearing. Effect of the Invention

[0018] According to the present invention, a sealing tape winding device can be provided that can wind a good seal regardless of the work size without increasing frictional resistance between the screw roller and the roller mounting base to which the screw roller is attached so that it can rotate freely when winding the sealing tape. [Brief description of the drawings]

[0019] [Figure 1] 1A and 1B are schematic diagrams of a sealing tape winding device according to an embodiment of the present invention, in which (a) is a front view and (b) is a plan view showing a drive roller, a screw roller, and a workpiece. [Diagram 2] 2 is a partially cutaway cross-sectional plan view showing a screw roller of the sealing tape winding device. FIG. [Diagram 3] This shows an example of the operation when the screw roller of the sealing tape winding device comes into contact with the workpiece, where (a) shows the state immediately after contact and (b) shows the state after the screw roller body has moved in the axial direction. [Figure 4] 1 shows another example of the operation of the screw roller of the sealing tape winding device when it comes into contact with the workpiece, where (a) shows the state immediately after contact and (b) shows the state in which the screw roller body is pressed against the sliding contact member while rotating. [Diagram 5] 13 is a partially cutaway cross-sectional plan view showing another embodiment of the screw roller of the sealing tape winding device. FIG. [Figure 6] FIG. 1 is a schematic front view of a conventional sealing tape winding device. [Figure 7] This is a front view explaining the operation of the sealing tape winding device, in which (a) shows the state in which the guide part together with the sealing tape has been lowered to the vicinity of the drive roller, and (b) shows the state in which the screw roller has been operated from the state in (a) to clamp the workpiece, and further the tension unit has been operated to apply tension to the sealing tape. [Figure 8] 7, this is a front view for explaining the operation of the sealing tape winding device, showing the state after the winding operation is completed and the cutting unit is activated. [Figure 9] FIG. 1 is an explanatory diagram of manually winding tape around a workpiece using a conventional sealing tape winding device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or its uses.

[0021] <Embodiment 1> 1 to 3 show a first embodiment of the present invention.

[0022] In this tape winding device 1, as in the conventional example, the threaded portion Wa of the work W, which has a threaded portion Wa formed at at least one end, is positioned in the working space S between the driving roller 10 and the paired screw roller 11, the leading end of the seal tape T is moved between the work W and the driving roller 10, the screw roller 11 arranged on the roller mount 12 is moved along with the roller mount 12, the work W is pressed against the driving roller 10, and the work W and the screw roller 11 are rotated in accordance with the rotation of the driving roller 10, whereby the seal tape T is wound around the screw portion Wa. An annular sliding member 4 is interposed between the roller mount 12 and the screw roller 11.

[0023] [Drive roller] The material of the drive roller 10 is not particularly limited, but in this embodiment, it is made of an elastic member (e.g., annular urethane rubber) fitted to the peripheral surface of the drive shaft of a drive means (e.g., an electric motor) that drives the drive roller 10 or a metallic rotating shaft connected to the tip of the drive shaft.

[0024] The triangular area connected by the driving roller 10 and the two screw rollers 11, 11 at the adjacent peripheral surfaces thereof becomes the working space S for winding the sealing tape T.

[0025] [Screw Roller] In this embodiment, two screw rollers 11 are arranged one above the other when viewed from the front as shown in Fig. 1. The screw rollers 11 are moved in a direction approximately perpendicular to the axis SC1 of the drive roller 10 by a slide unit 14. The slide unit 14 is not particularly limited as long as it exerts a pressing force sufficient to press the screw portion Wa of the workpiece W against the drive roller by the screw roller 10, and in this embodiment, an air cylinder with a guide is used.

[0026] The screw roller 11 is composed of a roller body 110 having a threaded portion 110x on its circumferential surface that engages with the thread Wa of the workpiece W and an insertion hole 110a formed in the axial direction, and a shaft-shaped mounting member 111 that is inserted through the insertion hole 110a and rotatably mounts the roller body 110 to the roller mounting base 12. The mounting member 111 is composed of a shaft portion 111c, a threaded portion 111b formed at the tip of the shaft portion 111c, and a head portion 111a at the other end that is larger in diameter than the shaft portion 111c. The insertion hole 110a is formed with a step portion 110b so that the diameter is larger on the side opposite to the roller mounting base 12, and an elastic member 112 is disposed between the inner annular end surface of the head portion 111a of the mounting member 111 and the step portion. In this embodiment, the screw portion 111b is a male screw and is screwed into the male screw portion 12a formed on the roller mounting base 12. Also, a through hole may be formed in the roller mounting base 12, and a nut may be used for fixing on the opposite surface. The elastic member 112 may be a spring or a disc spring, but in this embodiment, a spring is used.

[0027] It is also preferable to prepare a plurality of screw rollers 11 with different outer diameters and distances between the screw rollers according to the size of the workpiece W to be wound with the sealing tape T. For example, there can be three types of screw roller structures 13 (screw rollers 11 and roller mounts 12) for R1 / 8, for R1 / 4 and R3 / 8, and for both R1 / 2 and R3 / 4, or five types of screw roller structures 13 can be prepared for each size of the workpiece W.

[0028] [Work] The workpiece W is, for example, a tapered male thread for a pipe of R1 / 8 to R3 / 4. Usually, it has threads on both ends, but if one end is a tapered thread Wa, the other may be a parallel thread or a parallel thread with a nut attached. Also, if one end is formed with a male thread for wrapping the sealing tape T, the other end may be an adapter with a female thread.

[0029] [Sliding parts] The sliding member 4 is an annular member disposed between the annular end face of the screw roller body 110 on the roller mount 12 side and the roller mount 12, and in this embodiment, a thrust bearing 4A is used (see FIG. 2). The sliding member 4 may also be an annular member made of a material with high slidability, such as polyether ether ketone resin (PEEK), polyphenylene sulfide resin (PPS), nylon, acetal, polyimide or polyester.

[0030] In the tape winding device 1 of this embodiment, a triangular area connected by the driving roller 10 and the two screw rollers 11, 11 at the peripheral surface close portions thereof becomes a working space S for winding the sealing tape T. The device is equipped with a work holder (not shown) and a work clamping mechanism (not shown) that continuously supplies the work W to a work pushing mechanism (not shown) that positions the screw portion Wa of the work W in this working space S.

[0031] [Tape Guide] As in the conventional example, the tape guide 6 is composed of a guide portion 60 that covers the tip of the tape T fed from the tape holder 7 as shown in FIG. 1, and a strip-shaped portion 61 that is connected to the guide portion 60, is fixed inside the feed opening of the tape holder 7, and moves back and forth together with the tape holder 7 (moves up and down in the illustrated example) to carry the sealing tape T to the vicinity of the drive roller. The strip-shaped portion 61 is a rigid thin plate, for example, made of metal, with a width dimension approximately equal to that of the sealing tape T. The guide portion 60 is a plate-shaped member made of the same material as the strip-shaped portion 61, and covers the tip of the strip-shaped portion 61. Specifically, the guide portion 60 and the strip-shaped portion 61 are an integral member cut out from a single metal plate, and the protruding portion cut out in a T-shape is bent into a C-shape to form the guide portion 60. Alternatively, a separate member that becomes the guide portion 60 may be disposed in a T-shape on the back surface of the tip of the strip-shaped portion 61, and fixed by a fastening means such as spot welding, and then both ends are curved into a C-shape. In this case, both ends may be bent in advance into a C-shape and then attached and fixed to the tip of the belt-shaped portion 61. When the tape holder 7 reciprocates, the sealing tape T is covered by the guide portion 60 of the tape guide 6 and advances to the drive roller 10 side, and in a state where it is sandwiched between the drive roller 10 and the workpiece W, only the guide portion 60 can be raised.

[0032] The sealing tape T is attached by attaching a roll of the sealing tape T wound in multiple layers to the shaft of the tape holder 7, and inserting the sealing tape T into the gap between the guide portion 60 and the belt-shaped portion 61. The belt-shaped portion 61 is fixed inside the tape holder 7, and a reciprocating mechanism (not shown) of the tape holder 7 controlled by a control unit moves the sealing tape T together with the tape holder 7 to the vicinity of the drive roller 10. The long side of the lower end opening of the belt-shaped portion 61 is the portion against which the sealing tape T abuts under tension when the tension unit 5 described below is operated. Therefore, it is preferable to perform a predetermined R processing to prevent the sealing tape T from being cut when tension is applied by the tension unit 5.

[0033] [Tension unit] As in the conventional example, the tension unit 5 is disposed on the side of the anti-thread roller 11 immediately above the driving roller 10 as shown in Fig. 1, and is composed of a tension bar 50 having a pressing portion 50a formed at its tip, and a moving mechanism 52 that moves the tension bar 50 in a horizontal direction substantially perpendicular to the axis of the driving roller 10. The moving mechanism 52 is not particularly limited as long as it has a pressing force sufficient to apply tension to the sealing tape T sandwiched between the workpiece W and the driving roller 10, and in this embodiment, a pneumatic guided cylinder is used. The moving mechanism 83 of the cutting unit 8 also uses a similar cylinder.

[0034] The pressing portion 50a has an arc shape so as to prevent folding or cutting of the sealing tape T when pressing the sealing tape T from the drive roller 10 side to the screw roller 11 side. In this embodiment, a configuration in which it is molded integrally with the tension bar 50 is shown, but this is not limited thereto, and it may be a roller rotatably attached to the tip of the tension bar 50 via a shaft portion.

[0035] [Cutting unit] As in the conventional example, the cutting unit 8 is disposed between the tension unit 5 and the tape holder 7 as shown in FIG. 1, and comprises a fixed blade 81 at the upper part on the screw roller 11 side, a movable blade 82 attached to the tip of the flange 80, and a moving mechanism 83 that moves the flange 80 in a horizontal direction approximately perpendicular to the axis of the drive roller 10.

[0036] The cutting unit 8 cuts the sealing tape T by causing the cutting edges of the fixed blade 81 and the moving blade 82, which are cutting blades of the cutting unit 8, to cross each other as the moving blade 82 moves.

[0037] The device is also provided with a control unit (not shown) that controls the tape guide 6 to move close to the cutting unit 8 when the tension unit 5 is operating, and that controls the tape guide 6 to move above the cutting unit 8 when the winding work of the sealing tape T is completed, thereby operating the cutting unit 8. This control unit further controls the rotation speed, rotation timing and rotation time of the drive roller 10, and the operation timing of the tape guide 6.

[0038] Next, the situation in which the screw roller 11 in the sealing tape winding device 1 of this embodiment moves toward the workpiece W and the screw portion Wa of the workpiece W meshes with the screw portion 110x of the screw roller 11 between the drive roller 10 will be described in detail with reference to Figures 3 and 4.

[0039] When the peaks and valleys of the screw portion 110x of the screw roller 11 and the screw portion Wa of the workpiece W are aligned, no axial force is applied to the screw roller body 110 as shown in Figures 3 and 4. However, it is rare for the peaks and valleys of the screws to be aligned at the point of contact between the screw roller 11 and the workpiece W, and usually the initial point of contact between the screw roller 11 and the workpiece W is in the state shown in Figure 3(a) or Figure 4(a).

[0040] First, the screw roller 11 moves toward the workpiece W by the slide unit 14, and when the screw portions start to mesh, the positional relationship shown in Fig. 3(a) may be obtained. In this case, since the workpiece W is fixed, a force F toward the lower side of the figure acts on the screw roller body 110. In this embodiment, this force F causes the elastic member 112 to bend, and as shown in Fig. 3(b), the screw roller body 110 separates from the sliding member 4, and the operation proceeds to winding the sealing tape T without applying any extra load to any part.

[0041] Next, when the screw roller 11 moves toward the workpiece W by the slide unit 14 and the screw portion starts to mesh, the positional relationship shown in Fig. 4(a) may be obtained. In this case, a force F toward the upper side of the figure acts on the screw roller body 110. This force F acts as a pressing force on the sliding member 4, but if a thrust bearing 4A is used as the sliding member 4, the force F is inclined toward the twisting direction of the screw thread, and a force in the rotation direction is applied to the thrust bearing 4A as a component force of the inclination, and the screw roller body 110 easily rotates in the direction of the arrow Y as shown in Fig. 4(b), and the operation of winding the seal tape T proceeds without applying extra load to any part.

[0042] In this manner, when the sealing tape winding device 1 of this embodiment is in the positional relationship shown in Figure 3(a) when the screw portions begin to mesh, the elastic member 112 arranged in the screw roller main body 110 ensures that when the positional relationship shown in Figure 4(a) is achieved, the thrust bearing 4A as the sliding member 4 arranged between the screw roller 11 and the roller mounting base 12 ensures that no extra load is applied to any part, and in particular there is no increase in frictional resistance between the screw roller main body 110 and the roller mounting base 12, which in turn prevents the screw roller 11 from rotating poorly.

[0043] <Embodiment 2> FIG. 5 shows a second embodiment of the present invention.

[0044] In this tape winding device 1, a step portion 110c is formed at an insertion opening 110a opening in the screw roller body 110 of the screw roller 11 so that the roller mounting base 12 side has a larger diameter, and an elastic member 113 is disposed between the sliding member 4 and the step portion 110c.

[0045] As the elastic member 113, a spring or a disc spring can be used, similar to the elastic member 112 described in the first embodiment, but in this embodiment, a spring is used, similar to the first embodiment.

[0046] In addition, the elastic member 113 is disposed between the step portion 110c of the screw roller body 110 and the sliding member 4 in the example shown, but it can also be disposed between the sliding member 4 and the roller mounting base 12. In this case, it is preferable to use a disc spring with an inner diameter slightly larger than the outer diameter of the shaft portion 111c of the mounting member 111.

[0047] By providing the elastic member 113, when the screw roller 11 is moved toward the workpiece W by the slide unit 14 and the screw portions begin to mesh, as shown in FIG. 4(a), the gap between the screw roller body 110 and the sliding member 4 is reduced even without rotation of the sliding member 4 due to a component force corresponding to the twist angle of the screw threads, and no large load is applied to the sliding member 4. [Industrial Applicability]

[0048] As described above, the sealing tape winding device of the present invention can be suitably used as a winding device for newly designed sealing tapes, and can also be suitably used in existing sealing tape winding devices by replacing the screw roller structure. [Explanation of symbols]

[0049] 1 Sealing tape winding device 10 Drive roller 11 Screw roller 12 Roller mounting base 4. Sliding member 4A Thrust Bearing T Sealing Tape Double work

Claims

1. A threaded portion of a workpiece having a threaded portion formed at at least one end is positioned in a working space between a drive roller and a pair of screw rollers; A tip of a sealing tape is disposed between the workpiece and the drive roller; A seal tape winding device that moves a roller mounting base to which the screw roller is attached, presses the workpiece against the drive roller, and winds the seal tape around the screw portion by rotating the workpiece and the screw roller in accordance with the rotation of the drive roller, The screw roller has a roller body having a threaded portion on its circumferential surface that engages with the thread of a workpiece and an insertion hole formed in the axial direction; a shaft-shaped mounting member that is inserted into the insertion hole and that rotatably mounts the roller body to the roller mounting base; The mounting member is composed of a shaft portion, a threaded portion formed at a tip of the shaft portion, and a head portion having a larger diameter than the shaft portion at the other end, The insertion opening is formed with a step so that the diameter is larger on the side opposite the roller mounting base, and an elastic member is disposed between the inner annular end face of the head and the step.

2. The sealing tape winding device of claim 1 further comprises a step formed in the insertion port so that the roller mounting base side has a larger diameter, and an elastic member is disposed between the step and a circular sliding member interposed between the roller mounting base and the screw roller.

Images