JP2015139850A - Marking tool and marking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a marking tool and a marking method capable of easily marking a prescribed position of a pipe with a mark.SOLUTION: A marking tool 1 marking a pipe L with a mark includes: a first member 10 in contact with the pipe L during marking; a second member 11 which is provided on an opposite side of the first member 10 across the pipe L and is rotatably connected to an end of the first member 10 so that the pipe L is held between the second member 11 and the first member 10 during marking; and a fixing section 12 which is provided in the second member 11 and fixes a stamp 15 for marking the pipe L with the mark. The first member 10 includes a positioning section 25 for positioning the pipe L held between the first member 10 and the second member 11. The second member 11 includes a pressing section 51 for pressing the pipe L positioned by the positioning section 25. The fixing section 12 fixes the stamps 15 so that the pipe L which is held between the first member 10 and the second member 11 and is positioned can be marked with the mark.

Description

  The present invention relates to a marking tool and a marking method for marking a pipe with a mark.

  2. Description of the Related Art Conventionally, there is known a curved surface mark marking apparatus for marking a printed object having a curved surface (for example, see Patent Document 1). The mark marking device for curved surfaces includes an elastic printing body that forms a complementary marking surface with the curved surface of the object to be printed, a slide mechanism that brings the elastic printing body into and out of contact with the object to be printed, and an elastic printing body that slides by the slide mechanism and is at the tip. And a rod for supporting. In this curved surface mark marking apparatus, a mark is attached to the object to be printed by bringing the elastic stamping body into and out of contact with the object to be printed by a slide mechanism via a rod.

Japanese Utility Model Publication No. 56-165632

  By the way, as the object to be printed, for example, there is a pipe. In order to appropriately perform processing operations such as caulking on the piping, it is necessary to accurately mark a mark at a predetermined position of the piping. Here, in the mark marking device for curved surface described in Patent Document 1, since the positioning of the object to be printed and the elastic stamping body is not performed, it is difficult to accurately mark the mark at a predetermined position of the object to be printed. It is.

  Then, this invention makes it a subject to provide the marking tool and marking method which can mark a mark easily to the predetermined position of piping.

  The marking tool of the present invention is a marking tool for marking a pipe, and is provided on the opposite side of the first member with the pipe sandwiched between the first member that contacts the pipe at the time of marking, A second member rotatably connected to an end of the first member, and a stamp provided on the second member for marking the pipe. The first member has a positioning portion for positioning the pipe sandwiched between the first member and the second member, and the second member includes the positioning portion. A holding portion that holds the pipe positioned by the fixing member, and the fixing portion is marked between the first member and the second member and marks the mark with respect to the pipe positioned. Characterized by securing the stamp.

  According to this configuration, the piping is brought into contact with the positioning portion of the first member, the second member is rotated with respect to the first member, the piping is brought into contact with the holding portion of the second member, and the first By inserting the pipe between the member and the second member, the pipe can be marked with a stamp fixed by the fixing portion. For this reason, since the mark can be marked on the pipe with the pipe positioned, the mark can be easily marked at a predetermined position on the pipe. In addition, after marking, since the contact between the first member and the second member can be suppressed by expanding the space between the first member and the second member and removing the first member and the second member from the piping, the marking was made on the piping. The rubbing of the mark can be suppressed.

  In addition, the holding portion has a pair of protrusions that protrude to the pipe side and are arranged in the axial direction of the pipe, and the fixing portion has a pair of protrusion portions in the axial direction of the pipe. It is preferable that the contact portion of the pair of protrusions with the pipe and the stamp surface of the stamp on the pipe are on the same plane.

  According to this configuration, when a pipe having a predetermined diameter is sandwiched between the first member and the second member, in the axial direction, the pair of protrusions and the stamp face of the stamp are in contact with the pipe. For this reason, a mark can be marked on the pipe with the stamp while the pipe is pressed by the pair of protrusions. In other words, when a pipe having a diameter different from the predetermined diameter is sandwiched between the first member and the second member, in the axial direction, one of the pair of protrusions contacts the pipe, and the pair of protrusions The other side of the part and the stamp face do not contact (or are difficult to contact). For this reason, pipes having different diameters are not marked with a stamp (or imprinted). Thereby, marking of marks on pipes having different diameters can be suppressed, and marks can be suitably marked on pipes having a predetermined diameter.

  Moreover, it is preferable that the said contact part of the said projection part is formed in the curved surface which contacts a point with respect to the said piping.

  According to this configuration, since the pair of protrusions are in point contact with the pipe, the contact area of the protrusion with the pipe can be reduced as compared with the case where the pair of protrusions are in surface contact with the pipe. For this reason, it can suppress that the stamp face of a stamp inclines with respect to piping by contact of a projection part, and marking of the mark to piping can be performed stably.

  Moreover, it is preferable that the said positioning part has an axial direction positioning part which positions the said pipe in an axial direction, and a radial direction positioning part which positions the said pipe in radial direction.

  According to this configuration, the pipe can be positioned in the axial direction by the axial positioning portion, and the pipe can be positioned in the radial direction by the radial positioning portion. On the other hand, movement (rotation) in the circumferential direction of the pipe can be allowed.

  Moreover, it is preferable that the said radial direction positioning part has a pair of V-shaped block provided along with the axial direction of the said piping while forming a V-groove along the axial direction of the said piping.

  According to this configuration, by using the pair of V-shaped blocks, the piping can be easily positioned in the radial direction.

  Moreover, it is preferable that the said positioning part is comprised using aluminum.

  According to this configuration, since the positioning portion can be reduced in weight, operability can be improved. In addition, by using aluminum having a low hardness (soft) among metal materials, it is possible to suppress the formation of scratches on the piping due to the contact of the positioning portion.

  The fixing portion has a position adjusting mechanism capable of adjusting a mounting position of the stamp, and the position adjusting mechanism includes three screw members that support an end portion on the opposite side of the stamp face of the stamp at three points. It is preferable to have.

  According to this configuration, it is possible to easily adjust the attachment position of the stamp with the three screw members.

  Moreover, it is preferable that a mark visual recognition hole for visually confirming whether or not the mark marked on the pipe is marked at a predetermined position of the pipe is formed through the first member.

  According to this configuration, it is possible to confirm whether or not the mark is marked at a predetermined position of the pipe by visually observing the mark visual recognition hole.

  Moreover, it is preferable that a position visualizing hole for visually confirming the positioning of the pipe by the positioning portion is formed through the first member.

  According to this configuration, it is possible to confirm whether or not the pipe is positioned by viewing the position visual recognition hole.

  Moreover, it is preferable that the 1st member is formed with the avoidance groove | channel for avoiding the contact to the said mark marked on the said piping along the circumferential direction of the said piping.

  According to this configuration, even when the pipe marked with the mark is rotated in the circumferential direction, the contact between the first member and the mark can be avoided by the avoidance groove. Rubbing by one member can be suppressed.

  The marking method of the present invention is the above-described marking method using the marking tool, wherein the piping is positioned by bringing the piping into contact with the positioning portion of the first member and positioning the piping. The second member is rotated with respect to one member, the pipe is brought into contact with the pressing part of the second member, the pipe is sandwiched, and the pipe is fixed to the pipe by the stamp fixed by the fixing part. And a marking step for marking the mark.

  According to this configuration, since the mark can be marked on the pipe with the pipe positioned, the mark can be easily marked at a predetermined position on the pipe.

FIG. 1 is a perspective view illustrating an appearance of a marking tool according to the present embodiment. FIG. 2 is a side view of the marking tool according to the present embodiment. FIG. 3 is a plan view when the marking tool according to the present embodiment is viewed from the first member side. FIG. 4 is a cross-sectional view of the fixing portion of the marking tool according to the present embodiment when viewed from the side. FIG. 5 is a cross-sectional view of the fixing part of the marking tool according to the present embodiment when viewed from the second member side. FIG. 6 is an explanatory diagram regarding a marking operation using the marking tool according to the present embodiment.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same. Furthermore, the constituent elements described below can be combined as appropriate, and when there are a plurality of embodiments, the embodiments can be combined.

  FIG. 1 is a perspective view illustrating an appearance of a marking tool according to the present embodiment. FIG. 2 is a side view of the marking tool according to the present embodiment. FIG. 3 is a plan view when the marking tool according to the present embodiment is viewed from the first member side. FIG. 4 is a cross-sectional view of the fixing portion of the marking tool according to the present embodiment when viewed from the side. FIG. 5 is a cross-sectional view of the fixing part of the marking tool according to the present embodiment when viewed from the second member side. FIG. 6 is an explanatory diagram regarding a marking operation using the marking tool according to the present embodiment.

  The marking tool 1 of the present embodiment is a hand tool for marking a mark on the end of a pipe having a predetermined diameter, and a plurality of types are prepared according to the diameter of the pipe. The mark marked on the pipe is, for example, an indicator of the caulking position when caulking the pipe when connecting the ends of the pipe. In addition, as piping, there exist hydraulic piping of the hydraulic system provided in an aircraft, for example, and many hydraulic piping is provided. The marking tool 1 will be described with reference to FIGS. 1 and 2.

  As shown in FIGS. 1 and 2, the marking tool 1 includes a first member 10, a second member 11 provided to face the first member 10, and a fixing portion 12 provided to the second member 11. The second member 11 is connected to the first member 10 so as to be relatively rotatable. In the marking tool 1, the pipe is sandwiched between the first member 10 and the second member 11.

  The first member 10 is a member that comes into contact with the pipe at the time of marking on the pipe, and a longitudinal portion 21 that extends along the axial direction of the pipe, and a radial direction of the pipe from one end of the longitudinal portion 21. It is formed in an L-shape with the short part 22 projecting into the shape. The longitudinal portion 21 has a groove 23 formed along the axial direction of the pipe on the surface facing the second member 11, and an abutment block 31 and a pair of V-shaped blocks, which will be described later, are formed in the groove 23. 32 and a leaf spring 34 are arranged. The short part 22 is provided with a rotating shaft 13 that pivotally supports the second member 11.

  The first member 10 has a positioning portion 25 for positioning the pipe. The positioning portion 25 includes an axial positioning portion 26 for positioning the pipe in the axial direction and a radial positioning for positioning the pipe in the radial direction. Part 27. The positioning portion 25 positions the axial direction and the radial direction of the pipe while allowing movement (rotation) in the circumferential direction of the pipe.

  As shown in FIG. 1, the axial positioning portion 26 has an abutment block 31 that is fixed to the longitudinal portion 21 of the first member 10. The abutting block 31 has a rectangular shape and is made of aluminum. The abutting block 31 is disposed in the concave groove 23 of the long portion 21 on the short portion 22 side. The abutting block 31 positions the pipe in the axial direction by contacting the end face of the pipe.

  The radial positioning portion 27 has a pair of V-shaped blocks 32 that are fixed to the longitudinal portion 21 of the first member 10. A pair of V-shaped blocks 32 are respectively disposed in the concave grooves 23 of the long portion 21, and one V-shaped block 32 is provided on the side opposite to the short-side portion 22 side, and the other V-shaped block 32 is The one V-shaped block 32 and the butting block 31 are provided. For this reason, a pair of V-shaped blocks 32 are provided side by side in the axial direction of the piping.

  Each V-shaped block 32 is made of aluminum, and has a V-groove 33 extending along the axial direction of the pipe, and the pipe is accommodated in the V-groove 33. The pipe accommodated in the V-groove 33 is positioned in the radial direction by two points in the circumferential direction coming into contact with each V-shaped block 32.

  Further, the first member 10 is provided with a leaf spring 34 that biases the first member 10 and the second member 11 in a direction in which the first member 10 and the second member 11 spread. The leaf spring 34 is provided between the short part 22 and the abutting block 31, the end part on the abutting block 31 side is screwed and fixed to the long part 21, and the end part on the short part 22 side is The second member 11 is in contact with the second member 11 and is in a free state. For this reason, when the pipe is sandwiched between the first member 10 and the second member 11, the first member 10 and the second member 11 are centered on the rotation shaft 13 against the urging force of the leaf spring 34. Rotate in the direction to narrow. On the other hand, when the first member 10 and the second member 11 are separated from each other, the first member 10 and the second member 11 rotate in a direction spreading around the rotation shaft 13 by the biasing force of the leaf spring 34. .

  Further, a mark visual recognition hole 41, a mark scale line 42, a position visual recognition hole 43, and an avoidance groove 44 are formed in the longitudinal portion 21 of the first member 10.

  The mark visual recognition hole 41 is a hole for visually confirming whether or not the mark marked on the pipe is marked at a predetermined position on the pipe. As shown in FIGS. 1 and 3, the mark visual recognition hole 41 is formed through the surface of the longitudinal portion 21 that faces a stamp 15 (described later) provided in the second member 11. The mark visual recognition hole 41 is formed slightly larger than the mark marked on the pipe. When checking the mark marked on the pipe, the pipe after marking (or the marking tool 1) is relatively rotated in the circumferential direction so that the mark is placed in the mark visual recognition hole 41. And when a mark is settled in the mark visual recognition hole 41, it can confirm that the mark was marked in the predetermined position of piping.

  As illustrated in FIG. 3, the mark scale line 42 is formed on a surface (back surface) opposite to the second member 11 side of the longitudinal portion 21. A pair of mark scale lines 42 are formed on both sides of the mark visual recognition hole 41 in the axial direction of the pipe. The pair of mark scale lines 42 is a straight line parallel to a direction orthogonal to the axial direction of the pipe on the back surface of the longitudinal portion 21. Then, when the mark placed in the mark visual recognition hole 41 is the same length as the length between the pair of mark scale lines 42 in the axial direction of the pipe, the mark marked on the pipe is located at a predetermined position of the pipe. It can be determined that the marking has been made.

  The position visual recognition hole 43 is a hole for visually confirming the positioning of the pipe in the axial direction by the abutting block 31. As shown in FIG. 2, the position visualizing hole 43 is formed in the longitudinal portion 21 between the abutting block 31 and the other V-shaped block 32, and the pipe abutted against the abutting block 31 can be confirmed. ing.

  The avoidance groove 44 is a groove for avoiding contact with the mark marked on the pipe. As shown in FIG. 2, the avoidance groove 44 is formed on the surface of the longitudinal portion 21 on the second member 11 side along the circumferential direction of the pipe on which the mark is marked. For this reason, even if it is a case where piping (or marking tool 1) after marking is rotated in the peripheral direction relatively, a mark does not contact the 1st member 10 (longitudinal part 21).

  Next, the second member 11 will be described with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, the end of the second member 11 is pivotally connected to the short portion 22 of the first member 10 via a pivot shaft 13. The second member 11 is provided so as to extend along the axial direction of the pipe, and the end opposite to the rotating shaft 13 protrudes toward the first member 10 side.

  The second member 11 has a holding portion 51 that holds the pipe, and the holding portion 51 is positioned by the positioning portion 25 of the first member 10 when the first member 10 and the second member 11 sandwich the pipe. Holding down the pipe. The pressing part 51 includes a pair of protrusions 53 that protrude toward the first member 10 and are provided side by side in the axial direction of the pipe.

  As shown in FIG. 2, the pair of protrusions 53 are provided on the surface of the second member 11 on the first member 10 side. The pair of protrusions 53 are provided at positions facing the pair of V-shaped blocks 32 on the first member 10 side, and are arranged side by side in the axial direction of the pipe. The projecting portion 53 is formed in a curved surface where the contact portion that contacts the pipe is in point contact with the pipe, and in the present embodiment, is formed in a semicircular cross section.

  Next, the fixing unit 12 will be described with reference to FIGS. 1, 2, 4, and 5. As shown in FIGS. 1 and 2, the fixing portion 12 is provided on the second member 11 and is disposed between the pair of protruding portions 53. The fixing portion 12 fixes a stamp 15 for marking the pipe.

  The fixed portion 12 includes a cylindrical portion 55 that accommodates the stamp 15 therein, a flange portion 56 that protrudes outward from the cylindrical portion 55, and a position adjustment mechanism 57 that adjusts the mounting position of the stamp 15 accommodated therein. ing.

  The cylindrical portion 55 is disposed so as to penetrate the second member 11, and the stamp 15 accommodated therein is locked at the end of the cylindrical portion 55 on the first member 10 side. Here, the stamp 15 is formed in a tapered shape that expands toward the first member 10 in the axial direction of the cylindrical portion 55. Further, the stamp 15 is formed with a stepped portion by increasing the taper angle at the end on the first member 10 side. The cylindrical portion 55 is engaged with the step portion of the stamp 15 to lock the stamp 15. That is, the inner diameter of the cylindrical portion 55 is substantially the same as the diameter of the step portion of the stamp 15.

  The flange portion 56 is provided on the opposite side of the first member 10 across the second member 11, protrudes to the outer peripheral side of the cylindrical portion 55, and is provided along the circumferential direction. The flange portion 56 is fixed to the second member 11 with screws.

  As shown in FIG. 4, the position adjustment mechanism 57 is provided at the end of the cylindrical portion 55 opposite to the first member 10 side. The position adjusting mechanism 57 includes three screw members 61 that support the end portion of the stamp 15 opposite to the marking surface at three points. The position adjusting mechanism 57 is a state in which the angle of the stamp face of the stamp 15 is adjusted by adjusting the amount of protrusion of the three screw members 61 toward the stamp 15 side, and the angle of the stamp face of the stamp 15 is adjusted. Thus, the stamp 15 is fixed.

  Here, the contact point of the pair of protrusions 53 provided on the second member 11 to the pipe and the stamp surface of the stamp 15 fixed to the fixing portion 12 are on the same plane. The same surface has a pair of protrusions on the outer peripheral surface in the axial direction of the pipe when a pipe having a predetermined diameter marked by the marking tool 1 is sandwiched between the first member 10 and the second member 11. The portion 53 and the stamp 15 are in contact with each other.

  Next, with reference to FIG. 6, the marking method to piping using the marking tool 1 is demonstrated. First, when marking a mark on the pipe, the operator holds the marking tool 1 and places the first member 10 and the second member 11 on the positioning portion 25 of the first member 10 with the leaf spring 34 spreading. The piping L is made to contact and the piping L is positioned (step S1: piping positioning process). At this time, the operator looks at the position visual recognition hole 43 and confirms whether or not the pipe L is positioned.

  Thereafter, the operator holds the pressing portion 51 of the second member 11 by gripping the marking tool 1 so that the first member 10 and the second member 11 are narrowed against the urging force of the leaf spring 34. The pipe L positioned in contact with the pipe L and sandwiched by the positioning portion 25 is sandwiched. By sandwiching the pipe L, the stamp surface of the stamp 15 is stamped at a predetermined position of the pipe, and thereby a mark is marked at a predetermined position of the pipe L (step S2: marking process). At this time, the pipe L comes into contact with the pair of protrusions 53 and the stamp face of the stamp 15.

  After the marking, the operator releases the grip of the marking tool 1 so that the first member 10 and the second member 11 are spread by the urging force of the leaf spring 34. The operator spreads the first member 10 and the second member 11 by the leaf spring 34, and in a state where the pipe L is positioned by the positioning portion 25, the mark after marking is placed in the mark visual recognition hole 41. The marking tool 1 is rotated around the pipe L. Then, when the mark after marking fits in the mark visual recognition hole 41, the operator removes the marking tool 1 from the pipe L in a state where the first member 10 and the second member 11 are spread by the leaf spring 34, and the pipe The mark marking operation on L is finished. On the other hand, when the mark after marking does not fit in the mark visual recognition hole 41, the operator marks the pipe L again.

  When marking a plurality of marks in the circumferential direction of the pipe L, the marking tool 1 is appropriately rotated with respect to the pipe L, and the above steps are repeated.

  As described above, according to this embodiment, the pipe L is brought into contact with the positioning portion 25 of the first member 10 to position the second member 11 with respect to the first member 10, and the second member 11 is rotated. By marking the pipe L between the first member 10 and the second member 11 by bringing the pipe L into contact with the holding part 51 of the first and second members 11, a mark can be marked on the pipe L with the stamp 15 fixed by the fixing part 12. it can. For this reason, since the mark can be marked on the pipe L in a state where the pipe L is positioned, the mark can be easily marked at a predetermined position of the pipe L. Moreover, since the space | interval between the 1st member 10 and the 2nd member 11 is expanded after marking and the contact to the piping L of the 1st member 10 and the 2nd member 11 can be suppressed by removing from the piping L. The rubbing of the mark marked on the pipe L can be suppressed.

  Further, according to the present embodiment, the contact point of the pair of protrusions 53 to the pipe L and the stamp surface of the stamp 15 to the pipe L can be on the same plane. On the other hand, the pair of protrusions 53 and the stamp face of the stamp 15 can be brought into contact with each other. For this reason, a mark can be marked on the pipe L with the stamp 15 in a state where the pipe L is pressed by the pair of protrusions 53. In other words, when a pipe L having a diameter different from the predetermined diameter, for example, a large-diameter pipe L, is sandwiched between the first member 10 and the second member 11, the pair of protrusions 53 are provided in the pipe L. Among them, the protruding portion 53 on the rotating shaft 13 side comes into contact, and the protruding portion 53 on the side opposite to the rotating shaft 13 and the stamp surface of the stamp 15 do not contact (or are difficult to contact). For this reason, the pipes L having different diameters are not marked by the stamp 15 (or imprinted). Thereby, marking of the mark to the pipe L of a different diameter can be suppressed, and a mark can be suitably marked to the pipe L of a predetermined diameter.

  Moreover, according to the present Example, since a pair of projection part 53 is each in point contact with the pipe L, compared with the case where a pair of projection part 53 is each surface contact with the pipe L, the projection part 53 to the pipe L is provided. The contact area can be reduced. For this reason, it can suppress that the marking surface of the stamp 15 inclines with respect to the piping L by the contact of the projection part 53, and marking of the mark to the piping L can be performed stably.

  In addition, according to the present embodiment, the pipe L can be positioned in the axial direction by the axial positioning portion 26, and the pipe L can be positioned in the radial direction by the radial positioning portion 27. On the other hand, movement (rotation) of the pipe L in the circumferential direction can be allowed.

  Moreover, according to the present Example, by using a pair of V-shaped block 32, the piping L can be easily positioned in the radial direction.

  Moreover, according to the present Example, since the abutting block 31 and the V-shaped block 32 can be comprised using aluminum, the weight of the positioning part 25 can be achieved and an operator's operativity improves. Can be achieved. Moreover, it can suppress that the damage | wound is formed in the piping L when the positioning part 25 contact | abuts by using aluminum with low hardness (soft) among metal materials.

  Further, according to the present embodiment, the mounting position of the stamp 15 can be easily adjusted by the three screw members 61.

  Further, according to the present embodiment, it is possible to confirm whether or not the mark is marked at a predetermined position of the pipe L by visually observing the mark visual recognition hole 41.

  Moreover, according to the present Example, it can be confirmed whether the piping L was positioned by visually observing the position visual recognition hole 43. FIG.

  Further, according to the present embodiment, even if the pipe L marked with the mark is rotated in the circumferential direction, the avoidance groove 44 can avoid contact between the first member 10 and the mark. The marked mark can be prevented from being rubbed by the first member 10.

  In the present embodiment, the pair of protrusions 53 are curved surfaces that are in point contact with the pipe L, but may be in line contact or surface contact with the pipe L.

  Before marking the pipe L with the marking tool 1, mark the mark on the test pipe and check whether the marking tool 1 is properly marking the pipe L. May be.

DESCRIPTION OF SYMBOLS 1 Marking tool 10 1st member 11 2nd member 12 Fixed part 13 Rotating shaft 15 Stamp 21 Long part 22 Short part 23 Groove 25 Positioning part 26 Axial direction positioning part 27 Radial direction positioning part 31 Butting block 32 V character Block 33 V-groove 34 Leaf spring 41 Marking visual recognition hole 42 Marking scale line 43 Position visual recognition hole 44 Avoidance groove 51 Pressing part 53 Projection part 55 Cylindrical part 56 Flange part 57 Position adjustment mechanism 61 Screw member L Piping

Claims (11)

For marking tools that mark pipes,
A first member in contact with the pipe at the time of marking;
At the time of marking, the first member is provided on the opposite side of the first member with the piping interposed therebetween, and is pivotally connected to the end of the first member so as to sandwich the piping with the first member. Two members,
A fixing portion that is provided on the second member and fixes a stamp that marks the pipe.
The first member has a positioning portion for positioning the pipe sandwiched between the first member and the second member,
The second member has a holding portion that holds the pipe positioned by the positioning portion,
The said fixing | fixed part fixes the said stamp so that the said mark can be marked with respect to the said piping pinched and positioned between the said 1st member and the said 2nd member, The marking tool characterized by the above-mentioned. The pressing portion has a pair of protrusions that protrude toward the pipe side and are provided side by side in the axial direction of the pipe.
The fixing portion is provided between the pair of protrusions in the axial direction of the pipe,
The marking tool according to claim 1, wherein a contact portion of the pair of protrusions with the pipe and a stamp surface of the stamp with respect to the pipe are on the same plane.   The marking tool according to claim 2, wherein the contact portion of the protrusion is formed in a curved surface that makes point contact with the pipe.   The said positioning part has an axial direction positioning part which positions the said pipe in an axial direction, and a radial direction positioning part which positions the said pipe in radial direction, The any one of Claim 1 to 3 characterized by the above-mentioned. The marking tool described.   The said radial direction positioning part has a pair of V-shaped block provided along with the axial direction of the said piping while forming a V-groove along the axial direction of the said piping. Marking tool.   The marking tool according to claim 4 or 5, wherein the positioning portion is made of aluminum. The fixing portion has a position adjustment mechanism capable of adjusting the mounting position of the stamp,
The marking tool according to any one of claims 1 to 6, wherein the position adjusting mechanism includes three screw members that support an end portion on the opposite side of the stamp face of the stamp at three points.   The said 1st member is formed with the mark visual recognition hole for visually recognizing whether the said mark marked on the said piping was marked in the predetermined position of the said piping. The marking tool according to any one of 1 to 7.   The marking tool according to any one of claims 1 to 8, wherein a position visualizing hole for visually confirming the positioning of the pipe by the positioning portion is formed through the first member.   10. The first member according to claim 1, wherein an avoidance groove for avoiding contact with the mark marked on the pipe is formed along a circumferential direction of the pipe. The marking tool according to any one of claims. In the marking method to the said piping using the marking tool of any one of Claim 1 to 10,
A pipe positioning step for positioning the pipe by bringing the pipe into contact with the positioning portion of the first member;
The second member is rotated with respect to the first member, the piping is brought into contact with the pressing portion of the second member, the piping is sandwiched, and the piping is fixed by the stamp fixed by the fixing portion. And a marking step for marking the mark.

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