Marking tool

Abstract

The utility model belongs to the technical field of machining, and particularly relates to a marking tool which comprises a vernier caliper, the vernier caliper comprises a main scale, a fixed measuring claw and a vernier scale, and the vernier scale is in threaded connection with a fastening screw. A marking pin perpendicular to the side wall of the main caliper is fixedly arranged on the fixed measuring claw, and the marking end of the marking pin protrudes out of the outer wall of the vernier caliper; an auxiliary reference piece is fixedly arranged on the vernier scale and protrudes out of the scribing end of the scriber in the axial direction of the scriber; the side wall of one side, close to the fixed measuring claw, of the auxiliary reference piece is a lineation reference surface which is of a plane structure and is perpendicular to the axis of the main ruler in the length direction; and when the reading of the vernier caliper returns to zero, the center line of the scriber is coplanar with the scribing reference surface on the auxiliary reference piece. According to the utility model, the waste vernier caliper is recycled, which is green and environment-friendly; by using the marking tool, the marking operation of a long straight line can be completed at one time, the marking operation efficiency is improved, and the straightness of the marked straight line and the position precision of the marked straight line relative to a plate datum plane are improved.

Description

Technical Field

[0001] This utility model belongs to the field of machining technology, and specifically relates to a scribing tool. Background Technology

[0002] Vernier calipers are commonly used measuring tools in mechanical engineering, with typical vernier calipers achieving an accuracy of 0.02 mm. The structure of commonly used vernier calipers in current teaching is as follows: Figure 1 As shown, it includes a main scale 1, a fixed measuring jaw 2 located at the left end of the main scale 1, and a vernier scale 3 slidably connected to the main scale 1. The vernier scale 3 is always located to the right of the fixed measuring jaw 2. The fixed measuring jaw 2 on the upper side of the main scale 1 is the first outer measuring jaw 31, and the fixed measuring jaw 2 on the lower side of the main scale 1 is the first inner measuring jaw 41. The vernier scale 3 is provided with a second outer measuring jaw 32 that cooperates with the first outer measuring jaw 21 and a second inner measuring jaw 42 that cooperates with the first inner measuring jaw 41. A fastening screw 5 is also threaded onto the vernier scale 3, which is used to press against the main scale 1 to position the vernier scale 3 on the main scale 1. When the two adjacent reference surfaces on the first outer measuring jaw 31 and the second outer measuring jaw 32 are in contact, the two adjacent reference surfaces on the first inner measuring jaw 41 and the second inner measuring jaw 42 are also in contact with each other. At this time, the O scale line on the vernier scale 3 is collinear with the O scale line on the main scale 1, and the vernier caliper reading returns to zero. Generally, two inner measuring jaws cooperate to measure the bore diameter, and two outer measuring jaws cooperate to measure the outer diameter of the shaft. During measurement, the faces of the two inner measuring jaws that are opposite to each other are the measuring surfaces, and the measuring surfaces on the inner measuring jaws abut against the bore wall; the two reference surfaces on the two outer measuring jaws that are close to each other are also the measuring surfaces, and the measuring surfaces on the outer measuring jaws abut against the outer wall of the shaft.

[0003] During production and teaching, due to poor maintenance or frequent wear and tear, some vernier calipers have damaged measuring surfaces on their measuring jaws, even though the main scale (1) and vernier scale (3) are intact. This renders the calipers unusable and wastes resources. In machining, when processing large equipment, it's often necessary to draw long straight lines using the sidewall of the sheet metal as a reference surface for assembly or cutting. These long straight lines are typically over 10cm. On-site, steel rulers and squares are usually used with a scribing needle for this task. However, the length of the ruler and square is limited. After drawing a straight line of the same length as the ruler, the ruler needs to be moved horizontally before continuing. During this movement, the ruler is prone to shifting, causing the lines to be misaligned and affecting accuracy. Furthermore, this method is cumbersome, inefficient, and labor-intensive. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a scribing tool made from waste vernier calipers, which improves scribing accuracy and scribing efficiency, saves manpower, and is energy-saving and environmentally friendly.

[0005] The technical solution adopted by this utility model to solve the technical problem is as follows: a scribing tool, including a vernier caliper, the vernier caliper including a main scale, a fixed measuring jaw disposed at one end of the main scale, and a vernier scale slidably connected to the main scale, the vernier scale being threaded with a fastening screw; a scribing needle perpendicular to the side wall of the main scale is fixedly disposed on the fixed measuring jaw, the scribing end of the scribing needle protruding from the outer wall of the vernier caliper; an auxiliary reference component is fixedly disposed on the vernier scale, the auxiliary reference component protruding from the scribing end of the scribing needle along the axial direction of the scribing needle; the side wall of the auxiliary reference component near the fixed measuring jaw is a scribing reference surface, the scribing reference surface is a planar structure and is perpendicular to the axis of the length direction of the main scale;

[0006] When the vernier caliper reading is zero, the center line of the scribe line is coplanar with the scribing reference surface on the auxiliary reference component.

[0007] Furthermore, the side of the main scale with the graduation lines is the graduation surface, the scribe is perpendicular to the graduation surface, and the scribe end is located on the side of the main scale away from the graduation surface.

[0008] Furthermore, it also includes an adapter fixedly mounted on the fixed measuring claw, the adapter having a positioning through hole, and the scriber being located within the positioning through hole;

[0009] The adapter is also threaded with a positioning bolt. The axis of the positioning bolt is arranged radially along the positioning through hole. The bolt head of the positioning bolt is located outside the adapter. The screw of the positioning bolt abuts against the scribe in the positioning through hole and abuts against the hole wall of the positioning through hole.

[0010] Furthermore, the adapter is a plate-shaped structure riveted to the fixed measuring claw.

[0011] Furthermore, the auxiliary reference component includes a connecting plate connected to the vernier scale. The connecting plate is parallel to the scale surface and has a reference plate at one end near the fixed measuring jaw. The reference plate is perpendicular to the connecting plate, and the plane on the reference plate near the fixed measuring jaw is the scribing reference surface.

[0012] Furthermore, the connecting plate is welded onto the vernier scale.

[0013] Furthermore, the centerline of the scribe is coplanar with the sidewall of the fixed measuring jaw near the vernier scale, and the scribe reference plane is coplanar with the sidewall of the vernier scale near the fixed measuring jaw.

[0014] Furthermore, the auxiliary reference component is fixedly mounted on the fixed measuring jaw, and the scribe is fixedly mounted on the vernier scale.

[0015] Compared with existing technologies, the beneficial effects of this utility model are as follows: It provides a scribing tool that allows for the simultaneous scribing of relatively long straight lines without interruption, thus improving scribing efficiency and saving manpower. During the scribing process, the reference positioning surface cooperates with the reference surface of the material to achieve the positioning of the scriber relative to the reference surface. The positional accuracy of the scriber relative to the reference positioning surface is the same as the reading accuracy of the vernier caliper, improving the straightness of the scribed line and its positional accuracy relative to the reference surface. By setting the reference positioning surface and the center line of the scriber to be coplanar when the vernier caliper reading is zeroed, the real-time reading of the vernier caliper becomes the distance between the reference positioning surface and the scribing end, facilitating the adjustment of the distance between the reference positioning surface and the center line of the scriber, further improving the adjustment efficiency of the scribing tool. Furthermore, this utility model allows for the recycling of discarded vernier calipers that can no longer be used for measurement, saving costs and being environmentally friendly. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a vernier caliper in the background art;

[0017] Figure 2 This is a schematic diagram of the structure when the vernier caliper reading returns to zero in the background art;

[0018] Figure 3 This is a schematic diagram of the main structure of this utility model;

[0019] Figure 4 This is a top view of the structure of this utility model;

[0020] Figure 5 This is a top view of the structure of this utility model when the vernier caliper is zeroed.

[0021] Figure 6 This is a schematic diagram of the structure of this utility model in use;

[0022] Reference numerals: 1-Main scale; 11-Scale surface; 2-Fixed measuring jaw; 3-Vernier scale; 31-First outer measuring jaw; 32-Second outer measuring jaw; 41-First inner measuring jaw; 42-Second inner measuring jaw; 5-Fasting screw; 6-Scriber; 61-Scribping end; 7-Reference positioning component; 71-Scribping reference surface; 72-Connecting plate; 73-Reference plate; 8-Adapter; 82-Positioning bolt; 9-Sheet material; 91-Sheet material reference surface. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] As attached Figure 3-6 As shown, a scribing tool includes a vernier caliper. The vernier caliper includes a main scale 1, a fixed measuring jaw 2 disposed at one end of the main scale 1, and a vernier scale 3 slidably connected to the main scale 1. A fastening screw 5 is threaded onto the vernier scale 3. A scribing needle 6 perpendicular to the side wall of the main scale 1 is fixedly disposed on the fixed measuring jaw 2, and the scribing end 61 of the scribing needle 6 protrudes from the outer wall of the vernier caliper. An auxiliary reference component 7 is fixedly disposed on the vernier scale 3, and the auxiliary reference component 7 protrudes from the scribing end 61 of the scribing needle 6 along the axial direction of the scribing needle 6. The side wall of the auxiliary reference component 7 near the fixed measuring jaw 2 is a scribing reference surface 71, which is a planar structure and perpendicular to the axis of the length direction of the main scale 1. When the vernier caliper reading is zero, the center line of the scribing needle 6 is coplanar with the scribing reference surface 71 on the auxiliary reference component 7, and the reading of the vernier caliper is the distance between the reference positioning surface 71 and the center line of the scribing needle 6.

[0025] The vernier caliper used in this invention is a discarded vernier caliper with a damaged measuring surface, as described in the background art. When the vernier scale 3 slides along the length of the main scale 1, it drives the auxiliary reference component 7 and the scribing reference surface 71 to move synchronously in a straight line. The scribe 6 is positioned on the main scale 1, and its center line is collinear with the scribing end 61. By adjusting the position of the vernier scale 3 along the length of the main scale 1, the position of the reference positioning surface 71 on the main scale 1 is adjusted, thereby adjusting the distance between the reference positioning surface 71 and the scribe 6. The reading accuracy of the vernier caliper is generally up to 0.02 mm, and the adjustment accuracy and positioning accuracy of the distance between the scribe 6 and the reference positioning surface 71 are the same as the reading accuracy of the vernier caliper.

[0026] Before the scribing operation, the board 9 is placed horizontally on the workbench with the scribing surface facing upwards. The side wall of the board 9, which serves as the reference surface 91, protrudes from the side wall of the workbench. The external screw 5 makes the position of the vernier caliper 3 on the main scale 1 adjustable. After adjusting the position of the vernier caliper 3 on the main scale 1 so that the reading of the vernier caliper is equal to the distance of the scribing line relative to the reference surface 91 of the board, the internal screw 5 locks the vernier caliper 3 on the main scale 1. At this time, the position of the vernier caliper 3 and the auxiliary reference part 7 on it is fixed in the length direction of the main scale 1, and the reading of the vernier caliper is the distance of the reference positioning surface 71 relative to the center line of the scribing needle 6. During the scribing operation, the main ruler 1 is parallel to the top surface of the board 9, the scribing needle 6 is located above the board 9 and the scribing end 61 is in contact with the surface of the board 9 to be scribed, and the reference positioning surface 71 on the auxiliary reference component 7 abuts against the reference surface 91 of the board. Then, by pulling or pushing the entire scribing tool along the horizontal extension direction of the reference surface 9 of the board, a long straight line with the required distance from the reference surface 91 of the board can be drawn.

[0027] The scribing tool of this invention can complete the scribing of long straight lines in one go without stopping, improving scribing efficiency and saving manpower. During the scribing process, the reference positioning surface 71 cooperates with the reference surface 91 of the plate to achieve the positioning of the scribe 6 relative to the reference surface 91 of the plate. The positional accuracy of the scribe 6 relative to the reference positioning surface 71 is the same as the reading accuracy of the vernier caliper, improving the straightness of the scribing line and its positional accuracy relative to the reference surface 91 of the plate. By setting the center line of the reference positioning surface 71 and the scribe 6 when the vernier caliper reading is zeroed to be coplanar, the real-time reading of the vernier caliper is the distance between the reference positioning surface 71 and the scribing end 61 of the scribe 6, which facilitates the adjustment of the distance between the reference positioning surface 71 and the center line of the scribe 6, further improving the adjustment efficiency of the scribing tool. In addition, this invention allows for the recycling of used vernier calipers that can no longer be used for measurement, saving costs and being environmentally friendly.

[0028] The scriber 6 is a commonly used scriber structure in machining and assembly, and will not be described in detail here. The scriber 6 can be arranged in any direction perpendicular to the side wall of the main scale 1. Considering that the marking on site is not always performed according to the pre-designed position and dimensions, sometimes it is necessary to adjust the marking position in real time according to the actual shape and size of the board. In this case, it is necessary to observe and record the reading on the vernier caliper while adjusting the distance between the scriber 6 and the marking reference surface 71. Preferably, the side of the main scale 1 with the scale lines is the scale surface 11, the scriber 6 is perpendicular to the scale surface 11, and the marking end 61 is located on the side of the main scale 1 away from the scale surface 11. During the marking operation, the scale surface 11 is arranged facing upwards, which makes it convenient for the operator to read the vernier caliper reading.

[0029] The scriber 6 can be fixedly connected to the fixed measuring jaw 2 by welding, bolting, clamping, etc. After prolonged use, the scriber end 61 will wear down and needs to be replaced promptly. Preferably, it also includes an adapter 8 fixedly mounted on the fixed measuring jaw 2. The adapter 8 has a positioning through hole, and the scriber 6 is located within the positioning through hole. A positioning bolt 82 is also threaded onto the adapter 8. The axis of the positioning bolt 82 is arranged radially along the positioning through hole, and the bolt head of the positioning bolt 82 is located outside the adapter 8. The thread of the positioning bolt 82 abuts against the scriber 6 within the positioning through hole, causing the scriber 6 to abut against the wall of the positioning through hole. The positioning bolt 82 and the side wall of the positioning through hole cooperate to clamp and position the scriber 6 on the adapter 8. By rotating the positioning bolt 82 outward, the positioning bolt 82 is disengaged from the scriber 6, thereby making the axial position of the scriber 6 adjustable and detachable within the positioning through hole 6. After the scriber 6 is replaced or adjusted to the designated position, the positioning bolt 82 is rotated inward to make the positioning bolt 82 press against the scriber 6 again to complete the installation and positioning of the scriber 6.

[0030] The adapter 8 can be a frame structure, plate structure, or column structure, etc., and can be welded to the fixed measuring claw 2, or it can be welded to the fixed measuring claw 2 by riveting, bolting, or other methods. Preferably, the adapter 8 is a plate-like structure riveted to the fixed measuring claw 2, which is highly reliable and detachable. The cross-section of the positioning through hole has the same shape and size as the outer contour of the cross-section of the adapter 8. The positioning bolt 82 can be a common hex socket head cap screw or a commercially available wing bolt.

[0031] The auxiliary reference component 7 has various structural forms, including plate structures with L-shaped, U-shaped, or I-shaped cross-sections, as well as column or frame structures. Specifically, the auxiliary reference component 7 includes a connecting plate 72 connected to the vernier scale 3. The connecting plate 72 is parallel to the scale surface 11, and a reference plate 73 is provided at one end near the fixed measuring claw 2. The reference plate 73 is perpendicular to the connecting plate 72, and the plane on the reference plate 73 near the fixed measuring claw 2 is the scribing reference surface 71. The entire auxiliary reference component 7 is mounted on the vernier scale 3 via the connecting plate 72. The connecting plate 72 can be fixed to the vernier scale 3 by welding, bolting, riveting, etc. Considering that the auxiliary reference component 7 is always in contact with the plate reference surface 91 during the scribing operation, as a further preferred embodiment, the connecting plate 72 is welded to the vernier scale 3 to improve the connection stability of the auxiliary reference component 7.

[0032] The scriber 6 can be positioned anywhere on the fixed measuring jaw 2. When the scriber 6 is located on the side of the fixed measuring jaw 2 away from the vernier scale 3, to ensure that the center line of the scriber 6 is coplanar with the scribing reference surface 71 when the vernier caliper reading is zeroed, the auxiliary reference component 7 is placed on one side protruding from the vernier scale 3 and closer to the fixed measuring jaw 2. This is not only inconvenient to hold, but also prone to causing the auxiliary reference component 7 to bump into the scribing operator due to obstruction by the vernier scale 3 and the fixed measuring jaw 2. Therefore, preferably, the center line of the scriber 6 is coplanar with the side wall of the fixed measuring jaw 2 near the vernier scale 3, and the scribing reference surface 71 is coplanar with the side wall of the vernier scale 3 near the fixed measuring jaw 2. This makes the entire device easier to hold and use, and is safer and more reliable.

[0033] When the space outside the reference surface 91 of the plate is limited and cannot accommodate the part of the main scale 1 on the side of the fixed measuring claw 2, the auxiliary reference component 7 can be fixedly set on the fixed measuring claw 2, and the scribe 6 can be fixedly installed on the vernier scale 3.

[0034] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

[0035] In the description of this utility model, the terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe the positional relationship in the figure are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above-mentioned terms can be understood according to the specific circumstances.

Claims

1. A marking tool, comprising a vernier caliper, the vernier caliper comprising a main scale (1), a fixed measuring jaw (2) disposed at one end of the main scale (1), and a vernier scale (3) slidably connected to the main scale (1), wherein a fastening screw (5) is threadedly connected to the vernier scale (3); characterized in that: A scriber (6) perpendicular to the side wall of the main scale (1) is fixedly installed on the fixed measuring jaw (2), and the scribe end (61) of the scriber (6) protrudes from the outer wall of the vernier caliper; an auxiliary reference component (7) is fixedly installed on the vernier scale (3), and the auxiliary reference component (7) protrudes from the scribe end (61) of the scriber (6) along the axial direction of the scriber (6); the side wall of the auxiliary reference component (7) near the fixed measuring jaw (2) is a scribe reference surface (71), and the scribe reference surface (71) is a planar structure and perpendicular to the axis of the length direction of the main scale (1); When the vernier caliper reading is zero, the center line of the scribe (6) is coplanar with the scribing reference surface (71) on the auxiliary reference component (7).

2. The marking tool according to claim 1, characterized in that: The side of the main scale (1) with the scale lines is the scale surface (11), the scribe (6) is perpendicular to the scale surface (11), and the scribe end (61) is located on the side of the main scale (1) away from the scale surface (11).

3. The marking tool according to claim 2, characterized in that: It also includes an adapter (8) fixedly mounted on the fixed measuring claw (2), the adapter (8) having a positioning through hole, and the scriber (6) being located inside the positioning through hole; The adapter (8) is also threaded with a positioning bolt (82). The axis of the positioning bolt (82) is arranged radially along the positioning through hole. The bolt head of the positioning bolt (82) is located outside the adapter (8). The screw of the positioning bolt (82) abuts against the scribe (6) in the positioning through hole and makes the scribe (6) abut against the hole wall of the positioning through hole.

4. The marking tool according to claim 3, characterized in that: The adapter (8) is a plate-shaped structure riveted to the fixed measuring claw (2).

5. The marking tool according to claim 3, characterized in that: The auxiliary reference component (7) includes a connecting plate (72) connected to the vernier scale (3). The connecting plate (72) is parallel to the scale surface (11) and a reference plate (73) is provided at one end near the fixed measuring claw (2). The reference plate (73) is perpendicular to the connecting plate (72). The plane on the reference plate (73) near the fixed measuring claw (2) is the scribing reference surface (71).

6. The marking tool according to claim 5, characterized in that: The connecting plate (72) is welded onto the vernier scale (3).

7. The scribing tool according to any one of claims 1-6, characterized in that: The centerline of the scribe (6) is coplanar with the side wall of the fixed measuring jaw (2) near the vernier scale (3), and the scribe reference plane (71) is coplanar with the side wall of the vernier scale (3) near the fixed measuring jaw (2).

8. The scribing tool according to any one of claims 1-2, characterized in that: The auxiliary reference component (7) is fixedly mounted on the fixed measuring claw (2), and the scribe (6) is fixedly mounted on the vernier scale (3).

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