JP2011240426A - Marking-off tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a marking-off tool which enables dimensions of an axis line of a base hole and a marking-off pin in a marking-off pin holder to be accurately drawn in a target dimension position by setting a workpiece and a scale portion of the marking-off tool parallel to each other by making an axis line of a rotational central shaft agree with the axis line of the base hole of the workpiece, in marking-off work performed when a mounting hole or a tap hole is added together with the improvement of a built-in member and the like.SOLUTION: The marking-off tool includes: a scale 2 which has graduations 21 disposed in a length direction; the marking-off pin holder 4 which is slidably fitted into the scale 2, and the tip of which has a marking-off portion 42 attached so as to be capable of adjusting the amount of a protrusion in a direction perpendicular to the scale 2; and the rotational central shaft 32 which comprises a reference protrusion 322 fitted and inserted into the base hole 51 of the workpiece 5 and an abutting surface 321 perpendicular to the axis line of the reference protrusion 322 abutting on an outer peripheral surface of the base hole 51, and which is mounted to a base 31 fixed to a base end of the scale 2.

Description

  The present invention relates to a scoring tool for scoring on the basis of a hole already provided in a workpiece.

In general, in a manufacturing process that requires machining or machining, ruled writing is widely used as a means for easily performing machining and machining.
However, the scoring work is subject to various restrictions depending on the shape and size of the workpiece, the place where scoring is performed, and the like.
Among the scoring operations, the scoring operation may be performed when a mounting hole or a tapped hole is added to improve the incorporated member.
Japanese Utility Model Publication No. 61-1390 (Patent Document 1) is disclosed as a prior art.
FIG. 5 shows a scoring tool according to the prior art. The scale 01, the rotation center axis 02 fixed to the base end portion of the scale 011 of the scale 01, and the scale 01 are fitted to the scale 01, and the scale 01 along the scale 011 is shown. It is composed of a scribing side jaw 03 that slides on the desired position and scribing at a desired position.

One end of the center jaw 02 is fixed to the base end (0 point position) of the scale 011 of the scale 01 by aligning the axis L2 of the center jaw 02, and a tip end portion 021 having a conical shape is provided at the tip end of the other end portion. It has been. The center jaw 02 is fixed to the scale 01 so that the axis L2 of the center jaw 02 is perpendicular to the axis L1 (scale direction) of the scale 01.
Further, one end of the scoring side jaw 03 is slidably fitted along the scale 011 on the scale 01, and the other end has a scoring needle 031 for scoring the work. The scribing needle 031 is mounted so as to be able to advance and retreat in the direction of the axis L3 of the scribing side jaw 03, and is pressed to the advancing side by a spring (not shown). The scribing side jaw 03 is fitted with the scale 01 so that the axis L3 of the scribing side jaw 03 is perpendicular to the axis L1 of the scale 01, and is fitted so as to slide along the axis L1.

In the scoring tool having such a structure, when the point P in FIG. 6 is obtained, the scoring side jaw is positioned at a position on the scale 01 corresponding to the distance F between the reference hole R and the point P on the height E line from the bottom. 03 is installed and fixed with a fixture 032. Next, the tip part 021 formed in the conical shape of the center jaw 02 is fitted into the reference hole R, and a ruled line is drawn with the distance F as the radius on the workpiece 04, and the intersection point on the E line is obtained as the P point.
However, the conical tip portion 021 and the reference hole R are in a line contact state, and the axis L2 of the center jaw 02 is not necessarily perpendicular to the surface of the workpiece and is in an unstable state.

That is, when the pressing force of the scribing side jaw 03 to the workpiece 04 is small, if the axis L2 of the center jaw 02 is inclined by the angle θ1, the axis L1 of the scale 01 and the scribing side jaw 03 The axis L3 is inclined by θ1 with respect to each normal axis, but the center of the reference hole R and the scriber side jaw 03 are proportional to the distance from the center jaw 02 of the scriber side jaw 03 to the position on the scale 01. The distance F from the ruler needle 031 increases.
Further, when the pressing force of the scribing side jaw 03 to the workpiece 04 is large, if the axis L2 of the center jaw 02 is inclined by an angle of θ2, the axis L1 of the scale 01 and the scribing side jaw 03 Is inclined by θ2 with respect to the respective normal axes, so that the center of the reference hole R and the scoring side jaw 03 are proportional to the distance from the center jaw 02 of the scoring side jaw 03 to the position on the scale 01. There is a problem that the distance F from the crease needle 031 becomes small.

Japanese Utility Model Publication No. 61-1390

  Therefore, the present invention has been made in view of the above-mentioned problems, and in addition to the rotation center shaft in the scoring operation when performing additional processing of mounting holes or tapped holes accompanying improvement of incorporated members, etc. A right-angle holding part that is fitted in a reference hole of a workpiece, has a contact surface that contacts the outer peripheral surface of the reference hole, and is arranged so that the axis of the reference hole and the contact surface form a right angle. The contact surface is in contact with the outer peripheral surface of the reference hole so that the scale and the workpiece are parallel, so that the axis of the reference hole and the ruler needle holder It is an object of the present invention to provide a scoring tool that can accurately measure the dimensions of the needle portion.

  The present invention achieves such an object, and an axial scale having a scale in the length direction is slidably fitted in the length direction of the scale, and the tip is perpendicular to the scale. A scoring needle holder having a scoring projection attached so that the amount of protrusion can be adjusted, a base having either one of a concave portion for fitting or a convex portion fixed to the base end portion of the scale, and one end A right angle holding portion having a fitting portion that fits either one of the convex portion or the concave portion of the base portion and a contact surface that maintains the axis line in a direction perpendicular to the workpiece surface is disposed at the other end. And a center axis of rotation.

In this invention, the surface of the workpiece is formed by forming a ruled needle holder perpendicular to the scale and a rotation center axis having a contact surface for maintaining the axis of the rotation center axis in a direction perpendicular to the workpiece surface. Since the rotation center axis is at a right angle, the scale is parallel to the surface of the workpiece, and the accuracy of the scribing dimension can be accurately maintained.
In addition, since the coupling between the base and the rotation center shaft is a fitting structure, it is possible to deal with a plurality of reference holes by exchanging the rotation center shaft, and the manufacturing cost of the tool can be reduced.

  In the present invention, preferably, the other end of the rotation center shaft has a reference projection fitted into a reference hole formed in the workpiece, and is perpendicular to the axis of the reference projection, and the outer peripheral surface of the reference hole. It is good to provide the contact surface which contacts.

  With this configuration, the work surface and the center of rotation can be obtained by fitting the reference protrusion into the reference hole of the workpiece and bringing the contact surface perpendicular to the axis of the reference protrusion into contact with the outer peripheral surface of the reference hole. The axis perpendicular to the axis of the shaft can be easily maintained, and the reference projection is fitted in the reference hole, so that the rotation center axis can be prevented from shifting during the crease work, and the crease work with high accuracy. Has the effect of facilitating.

  Preferably, in the invention of the present application, the other end of the rotation center shaft has a socket portion formed with an engagement recess along the outer peripheral shape of the head portion of the bolt mounted on the workpiece, By fitting the socket part to the part, the outer peripheral plane of the head of the bolt and the contact surface of the inner periphery of the socket part come into contact, and the right angle between the surface of the workpiece and the axis of the rotation center axis It is good to maintain.

  With such a configuration, in the scoring operation when the bolt (bolt head shape is hexagonal or polygonal) is screwed to the workpiece, the bolt head is used as the rotation center of the scoring operation. It is possible to maintain the right angle between the workpiece surface and the axis of the rotation center axis (socket part) easily because the axis of the bolt head and the axis of the rotation center axis are located on the same axis. Therefore, it has an effect of facilitating highly accurate ruled writing.

  In the present invention, it is preferable that a level for confirming the level is provided at a part of the ruled needle holder or at least one of the rotation center shafts fitted with the scale.

  By adopting such a configuration, the parallelism between the scale and the workpiece can be easily confirmed by visual observation, and a highly accurate crease work is facilitated.

According to the present invention, the other end of the rotation center shaft is a rotation center shaft having a contact surface that maintains the axis of the rotation center axis in a direction perpendicular to the workpiece surface with the reference hole of the workpiece as the center. Thus, since the workpiece surface and the rotation center axis are perpendicular to each other, the scale is parallel to the surface of the workpiece, so that the accuracy of the ruled dimension can be accurately maintained.
In addition, since the coupling between the base and the rotation center shaft is a fitting structure, it is possible to deal with a plurality of reference holes by exchanging the rotation center shaft, and the manufacturing cost of the tool can be reduced.
Further, since the structure is such that the rotation center axis is not easily displaced with respect to the reference hole of the workpiece, there is an effect that a highly accurate scoring operation is facilitated.

These show the outline appearance perspective view of the scoring tool concerning a 1st embodiment of the present invention. (A) concerning a 1st embodiment of the present invention shows the central axis of rotation, and (B) shows the detailed drawing of a crease part of a crease needle holder. (A) is a schematic external perspective view of a rotation center shaft portion according to the second embodiment of the present invention, (B) is a cross-sectional view along BB of (A), and (C) is an external perspective view of the rotation center shaft. Indicates. These show the outline external view concerning a 3rd embodiment of the present invention. Shows the external view of the prior art. Shows an explanatory diagram of a method for implementing a scribing tool.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specifically described. Only.

(First embodiment)
FIG. 1 is a schematic external perspective view of a scoring tool according to the first embodiment. The scoring tool 1 includes a scale 2 having a scale 21 in the longitudinal direction and a base end portion of the scale 21 of the scale 2. A fixed scoring center part 3 and a scoring part 42 which is a scoring protrusion for marking a scoring line on the workpiece 5 are provided so as to be slidable along the scale 21 direction of the scale 2. And a ruled needle holder 4.
The scoring center part 3 has a base 31 fixed to the base end of the scale 21 of the scale 2 and a rotation center shaft 32 which is detachably fitted to the base 31 and serves as a center of rotation for scoring work. ing.

FIG. 2A shows a rotation center shaft 32 screwed into the base 31 of the scribing center 3. The base portion 31 is fixed to the base end portion of the scale 21 of the scale 2 and is provided with a female screw (not shown) that is a concave portion. The axis Lcf (not shown) of the female screw is located at the 0 point of the scale 21, and the axis Lcf is fixed at right angles to the axis Ls of the scale 2 to which the scale 21 is provided. The rotation center shaft 32 is provided with a male screw 323 having a convex portion at one end. The rotation center shaft 32 is screwed with the above-described female screw, and the axis Lcf of the female screw and the axis Lcm of the rotation center shaft 32 are arranged on the same line. It has become so.
In the present embodiment, the fitting portion of the base portion 31 is a female screw that is a concave portion. However, in the case of a convex portion, a male screw is provided, and the rotation center shaft 32 is provided with a female screw that is a concave portion at one end. .
A hexagonal spanner hook 324 is formed between the male screw 323 and the shaft portion 325 of the rotation center shaft 32, and is used for attaching and detaching the male screw 323 and the female screw of the base 31.

The other end is fitted into the reference hole 51 of the workpiece 5, and a reference protrusion 322 having an outer diameter such that the center of the reference hole 51 and the axis Lcm of the rotation center shaft 32 are substantially in the same axis, and a reference Between the protrusion 322 and the shaft portion 325, the outer peripheral portion that contacts the outer peripheral surface of the reference hole 51 of the workpiece 5 has a circular and flange-shaped contact surface 321, and the contact surface 321 is an axis Lcm. It arrange | positions so that it may become a right angle.
Therefore, it is necessary to replace the rotation center shaft 32 with one having the reference protrusion 322 along the diameter of the reference hole 51 of the workpiece 5, and the base 31 and the rotation center shaft 32 are screwed to each other, so that the rotation center The shaft 32 is easily exchanged.
Further, the flange portion 326 of the contact surface 321 is larger than the outer diameter of the shaft portion 325, and the connection shape from the outer diameter of the flange portion 326 to the outer diameter of the shaft portion 325 is an R portion shape having a smooth curved surface. It has become.
The size of R of the curved surface R portion is determined by pressing the shaft portion 325 with a finger and pressing the contact surface 321 of the flange portion 326 toward the outer peripheral surface of the reference hole 51 of the workpiece 5 toward the workpiece 5 side. The finger and the curved surface R portion are sized to be familiar.

FIG. 2B shows the structure of the tip of the crease portion 42 which is a crease projection fixed to the base portion 41 of the crease needle holder 3.
In the ruler 42, a ruler needle 45 fitted in the outer cylinder 43 is slidably disposed along the axis Lk of the outer cylinder 43. A compression type coil spring 44 is provided between the outer cylinder 43 and the scriber needle 45 so that a pressing force always acts on the workpiece 5 side.

Therefore, the scoring needle holder 4 is moved to the work 5 side so that the reference protrusion 322 is fitted into the reference hole 51 of the work 5 and the contact surface 321 of the flange 326 is brought into contact with the entire outer peripheral surface of the reference hole 51. As a result, the scoring needle 45 is fitted into the outer cylinder 43 against the pressing force of the coil spring 44. When the flange-shaped contact surface 321 contacts the entire outer peripheral surface of the reference hole 51, the plane of the work 5 and the axis Ls of the scale 2 become parallel, and a highly precise ruled line can be drawn.
In addition, since the rotation center shaft 32 is a smoothly curved R portion in the portion where the outer diameter of the flange portion 326 changes to the outer diameter of the shaft portion 325, the contact surface 321 serves as the reference hole 51 of the workpiece 5. When pressing and marking on the workpiece 5, the rotation center shaft 32 rotates along the axis Lcm of the rotation center shaft 32, but since it is an R portion, it smoothly touches the operator's finger portion, It is easy to apply a pressing force of the rotation center shaft 32 to the work 5 and has an effect of making the front surface of the contact surface 321 easily contact the surface of the work.

(Second Embodiment)
3A and 3B relate to a second embodiment of the present invention, in which FIG. 3A is a schematic external perspective view of a scoring center portion 7, FIG. 3B is a cross-sectional view along line BB in FIG. 72 shows an external perspective view.
In addition, about the same component as 1st Embodiment, in order to clarify a component, the same code | symbol is attached | subjected.
In FIG. 3 (A), a scoring tool 6 is fixed to the scale 2 with a scale 21 in the longitudinal direction and the base end of the scale 21 of the scale 2 and serves as the center of scoring of the scoring operation. Part 7 is shown. Other configurations are the same as those in the first embodiment, and thus are omitted.
The scoring center 7 includes a base 70 fixed to the base end of the scale 21 of the scale 2, a columnar support 71 fixed to the base 70 and extending from the base 70 toward the work 5 side, A socket portion 722 having one end externally fitted to the support portion 71 and held by a holding device 73 to be described later attached to the support portion 71 and the other end fitted to the head of a bolt attached to the workpiece 5. The rotation center shaft 72 is provided.

3B is a cross-sectional view taken along line BB in FIG. 3A, and FIG. 3C is an external perspective view of the rotation center shaft 72.
A structure is shown in which an outer fitting portion 721, which is one end of the rotation center shaft 72, is fitted on the support portion 71 of the base portion 70 to hold the rotation center shaft 72.
A circular recess 711 is formed in the outer peripheral portion of the support portion 71. In the recess 711, a holding device 73 in which an engagement ball 731 pressed outward by a leaf spring 733 is held by a casing 732 is disposed.
On the other hand, an engagement groove 724 having a semicircular cross section is provided on the inner peripheral side portion of the outer fitting portion 721 that is one end of the rotation center shaft 72 over the entire circumference. When the external fitting portion 721 is externally fitted to the support portion 71, a part of the engagement ball 731 is fitted into the engagement groove 724, and the rotation center shaft 72 maintains the engagement in the axial direction with respect to the support portion 71. In addition, the support portion 71 is rotatable in the radial direction.

A hexagonal columnar hollow portion 723 is formed on the inner peripheral portion of the socket portion 722, which is the other end of the attachment 72, and is fitted on the head of the hexagon bolt.
The socket part that fits on the head of the bolt is usually a hexagonal bolt, but in special cases, it has a head shape of 4, 8, or 12 squares. The rotation center shaft 72 having a socket portion corresponding to the above is used.

According to the second embodiment, it is used when a bolt is fastened to the reference hole 51 of the workpiece 5, and when the socket part 722 is externally fitted on the bolt head, (In the case of bolts, the height of 6 surfaces) (the axial direction of the bolt) is in surface contact with the surface of the socket portion 722 that forms the columnar hollow portion 723, so the axis of the rotation center shaft 72 and the axis of the bolt are the same axis. The axis of the rotation center axis 72 and the surface of the workpiece 5 are perpendicular to each other.
Therefore, when the scoring needle holder 4 is pressed toward the workpiece 5 so that the square surface of the bolt head and the columnar hollow part 723 of the socket part 722 are fitted, the scoring needle 45 of the scoring needle holder 4 is moved to the coil spring 44. The workpiece 5 enters the outer cylinder 43 against the pressing force, and the workpiece 5 and the scale 2 are parallel to each other, so that a highly precise ruled line can be drawn.
In the second embodiment, a part of the engagement ball 731 is fitted into the engagement groove 724, and the rotation center shaft 72 is engaged and maintained with the support portion 71 in the axial direction. Since it is slidable in the radial direction, even if the attachment 72 is fitted to the bolt head and the scale 2 is rotated around the bolt head, the bolt is not rotated, so the bolt tightening torque It has the effect of preventing changing the tightening force of the bolt that has been adjusted.

(Third embodiment)
FIG. 4 shows a schematic external perspective view according to the third embodiment of the present invention.
In addition, about the same component as 1st Embodiment, in order to clarify a component, the same code | symbol is attached | subjected and it abbreviate | omits since a function and a structure are the same as 1st Embodiment.
In FIG. 4, the scoring tool 8 includes a scale 2 with a scale 21 in the longitudinal direction, a scoring center 3 fixed to the base end of the scale 21 of the scale 2, and a scale 21 of the scale 2. It is composed of a scriber needle holder 4 provided with a scriber part 42 which is a scriber protrusion which is slidably fitted along the direction and forms a scriber line on the workpiece 5. A ruler needle holder 4 having a ruler unit 42 for marking a ruled line on a work, and a level fixed to the upper surface of the ruler needle holder 4 are configured.

The level 9 is a general bubble tube level manufactured by a bubble tube attached to a metal or resin case (a glass closed container in which one bubble is sealed in an alcohol or ether liquid). It's okay.
The level 9 is fixed to the position opposite to the scoring needle 45 of the scoring needle holder 4 with an adhesive or a screw with reference to the scale 2.
The same effect can be obtained even if the level 9 is attached to the base 31 of the scoring center 3.

  According to the third embodiment, the fact that the contact surface between the outer peripheral surface of the reference hole 51 of the workpiece 5 and the contact surface 321 of the rotation center shaft 32 that is difficult to visually confirm is in direct contact with the visual inspection indirectly. This has the effect of making it easier to carry out a more reliable work of marking. (Similar effects can be obtained even when the level of the present embodiment is attached to the second embodiment.)

  Ruled lines that use existing holes or the heads of bolts (or nuts) that are fastened in the scoring operation to add holes or tapped holes for improvement of incorporated members It can be applied as a writing tool.

1, 6, 8 crease tool 2 scale 3, 7 crease center 4 crease needle holder 5 work 9 level 21 scale 31, 70 base 32, 72 rotation center axis 42 crease 45 crease needle 51 reference hole 73 Holding device 321 Contact surface 322 Reference protrusion 324 Spanner hooking part 722 Socket part 723 Columnar hollow part 724 Engaging groove 731 Engaging ball 733 Leaf spring

Claims (4)

  For scribing with a scale with a scale in the length direction and a slidable fit in the length direction of the scale, and attached to the tip so that the amount of protrusion can be adjusted in the direction perpendicular to the scale A scoring needle holder having a protrusion, a base fixed to the base end of the scale and having either a fitting recess or a protrusion, and one of the protrusion or recess of the base at one end A rotation center shaft having a fitting portion that fits with one side and a right angle holding portion having a contact surface that maintains the axis line in a direction perpendicular to the workpiece surface at the other end. Characteristic marking tool.   At the other end of the rotation center shaft, there are a reference protrusion that fits into a reference hole formed in the workpiece, and a contact surface that forms a right angle with the axis of the reference protrusion and contacts the outer peripheral surface of the reference hole. The scoring tool according to claim 1, further comprising a scribing tool.   The other end of the rotation center shaft has a socket part formed with an engagement recess along the outer peripheral shape of the head part of the bolt mounted on the workpiece, and the socket part is fitted to the head part of the bolt By doing so, the outer peripheral plane of the head of the bolt and the contact surface of the inner periphery of the socket part are in contact with each other, and the right angle between the surface of the workpiece and the axis of the rotation center axis is maintained. The scoring tool according to claim 1.   2. The scoring tool according to claim 1, wherein a leveling tool for checking the level is disposed at a part of the scoring needle holder or at least one of the rotation center shafts where the scale is externally fitted.

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