Graduated scale

Abstract

The utility model discloses a graduated scale, which relates to the field of measuring instruments and comprises a scale body, first protrusions are integrally and symmetrically arranged on the scale body in the length direction, second protrusions are integrally and symmetrically arranged between one side of the scale body in the length direction and the first protrusions, and a plurality of transverse scale marks are uniformly distributed on one side of the scale body. According to the graduated scale, the bottom of the second protrusion is placed on the top of the edge of the furnace-passing jig, the longitudinal edge of the first protrusion is tightly attached to the edge of the furnace-passing jig, the side face of the first protrusion is attached to the side face of the furnace-passing jig, and the length size of the second protrusion is the distance between the edge of the furnace-passing jig and the edge of a PCB. The height size of the second protrusion is larger than the height of the lamp bead, distance measurement is carried out through the scales of the transverse scale lines, meanwhile, the ruler body does not make contact with the lamp bead, and the scratch risk of non-contact measurement is reduced.

Description

Technical Field

[0001] This utility model relates to measuring instrument technology, specifically to a scale ruler. Background Technology

[0002] A ruler is a tool used to measure the length of objects, using units of length as the standard for marking. Its basic structure includes evenly distributed graduations, numerical markings, and a zero mark. The graduations indicate units of length, such as centimeters, millimeters, or inches, while the numerical markings directly display the corresponding length values. The zero mark is the starting point for measurement and is usually located at the far left of the ruler.

[0003] During the reflow or wave soldering process of PCBs, a ruler is needed to measure and verify whether the size and soldering position of the LEDs soldered on the top of the PCB meet the design standards. However, the edge of the reflow oven fixture can affect the ruler's measurement of the PCB, and the angle between the ruler and the PCB can affect the accuracy of the measurement. Furthermore, the protrusion of the LEDs soldered on the PCB can also affect the measurement of the PCB. In addition, there is a risk that the ruler may scratch the surface of the LEDs during measurement. Utility Model Content

[0004] The purpose of this invention is to provide a ruler that addresses the shortcomings of existing rulers in measuring PCB boards, such as inaccurate measurements due to deviation and the tendency to scratch the surface of LED beads.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a ruler, comprising a ruler body, wherein a first protrusion is integrally formed and symmetrically arranged along the length direction of the ruler body, a second protrusion is integrally formed and symmetrically arranged between the first protrusion and one side of the ruler body along the length direction, and a plurality of evenly distributed transverse scale lines are provided on one side of the ruler body.

[0006] Furthermore, a mounting cavity is provided through the second protrusion, and a longitudinal measuring unit is provided inside the mounting cavity. A longitudinal scale line is provided on one side of the second protrusion.

[0007] Furthermore, the longitudinal measurement unit includes:

[0008] A threaded rod is longitudinally arranged and rotatably mounted inside the mounting cavity, with a thread on the middle of the outer side of the threaded rod.

[0009] An isolation plate is fixedly installed inside the mounting cavity, and the isolation plate is penetrated by a threaded rod, with the outer side of the threaded rod rotatably connected to the penetration point of the isolation plate;

[0010] A fixed gear is fixedly installed on the top of the threaded rod, and the fixed gear is located inside the mounting cavity and above the isolation plate;

[0011] An optical axis, the top of which is fixedly installed on the bottom of the isolation plate, and the bottom of the optical axis is fixedly connected to the bottom of the inner side of the mounting cavity;

[0012] A movable plate is threaded to the outside of a threaded rod, and the movable plate is penetrated by an optical axis, with the penetration point of the movable plate slidably connected to the outside of the optical axis;

[0013] Two measuring rods are symmetrically fixedly installed on the outside of the movable plate, and the measuring rods are also located on the outside of the second protrusion.

[0014] Furthermore, a large gear is meshed with the outer side of the fixed gear, and the large gear is rotatably connected to the top of the inner side of the mounting cavity via a rotating shaft.

[0015] Furthermore, a small gear is meshed with the outer side of the large gear, and the small gear is rotatably connected to the top of the inner side of the mounting cavity via a rotating shaft.

[0016] Furthermore, a portion of the small gear is located outside the second protrusion, and a portion of the large gear is located outside the second protrusion.

[0017] Compared with the prior art, the scale provided by this utility model places the bottom of the second protrusion on the top edge of the reflow oven fixture, with the longitudinal edge of the first protrusion close to the edge of the reflow oven fixture, and the side of the first protrusion in contact with the side of the reflow oven fixture. The length of the second protrusion is the distance between the edge of the reflow oven fixture and the edge of the PCB, and the height of the second protrusion is greater than the height of the LED bead. The distance is measured by the scale of the horizontal scale line, while ensuring that the scale body does not contact the LED bead, reducing the risk of scratches from non-contact measurement. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure provided for Embodiment 1 of the present utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure provided for Embodiment 2 of the present utility model;

[0021] Figure 3 This is a partial cross-sectional view of the overall structure provided in Embodiment 2 of this utility model;

[0022] Figure 4 This is a schematic diagram of the longitudinal measurement unit structure provided in Embodiment 2 of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Ruler body; 2. First protrusion; 3. Second protrusion; 4. Horizontal scale line; 5. Longitudinal measuring unit; 6. Mounting cavity; 7. Longitudinal scale line; 51. Isolation plate; 52. Optical axis; 53. Threaded rod; 54. Moving plate; 55. Measuring rod; 56. Fixed gear; 57. Large gear; 58. Small gear. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0026] Example 1:

[0027] Please see Figure 1 A ruler includes a ruler body 1, a first protrusion 2 integrally formed and symmetrically arranged along the length direction of the ruler body 1, a second protrusion 3 integrally formed and symmetrically arranged between one side of the ruler body 1 and the first protrusion 2, and a plurality of evenly distributed transverse scale lines 4 arranged on one side of the ruler body 1.

[0028] The ruler body 1 is made of non-deformable acrylic sheet or FR-4 material. The ruler body 1 can be a transparent sheet or an opaque sheet. When in use, place the bottom of the second protrusion 3 on the top edge of the reflow oven fixture, and the longitudinal edge of the first protrusion 2 is close to the edge of the reflow oven fixture. The side of the first protrusion 2 is in contact with the side of the reflow oven fixture. The length of the second protrusion 3 is the distance between the edge of the reflow oven fixture and the edge of the PCB. The height of the second protrusion 3 is greater than the height of the LED bead. The distance is measured by the scale of the horizontal scale line 4.

[0029] Example 2:

[0030] Please see Figures 2 to 4 This embodiment provides a technical solution based on embodiment one: a mounting cavity 6 is provided through the second protrusion 3, a longitudinal measuring unit 5 is provided in the mounting cavity 6, and a longitudinal scale line 7 is provided on one side of the second protrusion 3.

[0031] The longitudinal measuring unit 5 is used to measure the height of the LED beads.

[0032] Longitudinal measurement unit 5 includes:

[0033] The threaded rod 53 is longitudinally arranged and rotatably installed inside the mounting cavity 6, and the threaded rod 53 has a thread on the middle of its outer side.

[0034] The isolation plate 51 is fixedly installed inside the mounting cavity 6. The isolation plate 51 is penetrated by the threaded rod 53, and the outer side of the threaded rod 53 is rotatably connected to the penetration point of the isolation plate 51.

[0035] A fixed gear 56 is fixedly installed on the top end of the threaded rod 53. The fixed gear 56 is located inside the mounting cavity 6 and above the isolation plate 51.

[0036] The optical axis 52 is fixedly installed at the bottom of the isolation plate 51 at its top end, and the bottom end of the optical axis 52 is fixedly connected to the bottom of the inner side of the mounting cavity 6.

[0037] The movable plate 54 is threaded to the outside of the threaded rod 53. The movable plate 54 is penetrated by the optical axis 52, and the part of the movable plate 54 that is penetrated is slidably connected to the outside of the optical axis 52.

[0038] Two measuring rods 55 are symmetrically fixed on the outside of the movable plate 54, and the measuring rods 55 are also located on the outside of the second protrusion 3.

[0039] A large gear 57 is meshed with the outer side of the fixed gear 56, and the large gear 57 is rotatably connected to the top of the inner side of the mounting cavity 6 via a rotating shaft.

[0040] The outer side of the large gear 57 is meshed with a small gear 58, and the small gear 58 is rotatably connected to the top of the inner side of the mounting cavity 6 via a rotating shaft.

[0041] The small gear 58 is located outside the second protrusion 3, and the large gear 57 is located outside the second protrusion 3.

[0042] The isolation plate 51 is used to separate the fixed gear 56 from the moving plate 54. When it is necessary to measure the height of the LED bead, the large gear 57 is rotated manually first. The large gear 57 meshes with the fixed gear 56 to drive the threaded rod 53 to rotate. The threaded rod 53 drives the moving plate 54 to move downward, so that the measuring rod 55 is close to the top of the LED bead. Then, the small gear 58 is driven to rotate. The small gear 58 meshes with and drives the large gear 57 to rotate. The large gear 57 meshes with and drives the fixed gear 56 to rotate, so that the moving plate 54 continues to move downward. The measuring rod 55 approaches and contacts the surface, and the height of the LED bead is read through the longitudinal scale line 7.

[0043] All standard parts used in this utility model can be purchased from the market. Irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0044] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. "A plurality of" means two or more, unless otherwise explicitly specified.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0048] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0049] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A ruler, comprising a ruler body (1), characterized in that, The ruler body (1) is integrally formed with a first protrusion (2) symmetrically arranged along its length direction. A second protrusion (3) is integrally formed with the first protrusion (2) on one side of the ruler body (1) and symmetrically arranged between the first protrusion (2). A number of evenly distributed transverse scale lines (4) are provided on one side of the ruler body (1).

2. A ruler according to claim 1, characterized in that, The second protrusion (3) has a through-hole (6) and a longitudinal measuring unit (5) is provided in the mounting cavity (6). A longitudinal scale line (7) is provided on one side of the second protrusion (3).

3. A ruler according to claim 2, characterized in that, The longitudinal measurement unit (5) includes: A threaded rod (53) is arranged longitudinally and rotatably installed inside the mounting cavity (6), and the threaded rod (53) has a thread in the middle of its outer side; An isolation plate (51) is fixedly installed inside the mounting cavity (6). The isolation plate (51) is penetrated by a threaded rod (53), and the outer side of the threaded rod (53) is rotatably connected to the penetration point of the isolation plate (51). A fixed gear (56) is fixedly installed on the top of the threaded rod (53). The fixed gear (56) is located inside the mounting cavity (6) and above the isolation plate (51). The optical axis (52) is fixedly installed at the bottom of the isolation plate (51) at its top end, and the bottom end of the optical axis (52) is fixedly connected to the bottom of the inner side of the mounting cavity (6); A movable plate (54) is threaded to the outside of a threaded rod (53). The movable plate (54) is penetrated by an optical axis (52), and the part of the movable plate (54) that is penetrated is slidably connected to the outside of the optical axis (52). Two measuring rods (55) are symmetrically fixed on the outside of the movable plate (54), and the measuring rods (55) are also located on the outside of the second protrusion (3).

4. A ruler according to claim 3, characterized in that, The fixed gear (56) is meshed with a large gear (57) on its outer side, and the large gear (57) is rotatably connected to the top of the inner side of the mounting cavity (6) via a rotating shaft.

5. A ruler according to claim 4, characterized in that, The large gear (57) is meshed with a small gear (58) on its outer side, and the small gear (58) is rotatably connected to the top of the inner side of the mounting cavity (6) via a rotating shaft.

6. A ruler according to claim 5, characterized in that, A portion of the pinion (58) is located outside the second protrusion (3), and a portion of the gear (57) is located outside the second protrusion (3).

Images