Marking device

Abstract

The present application provides a marking device capable of properly marking with a marker. In a marking unit (10) of the marking device (1), an up-down driving mechanism (30) mounted on a base (20) drives a movable block (40) in the up-down direction. A marking head (50) holding a marker (5) with the nib (5a) facing downward is movably supported on the movable block (40). A compression coil spring (95) is arranged between the marking head (50) and the movable block (40), and exerts an upward force on the marking head (50) against the weight of the marking head (50). A pen pressure adjustment mechanism (90) is formed in the marking head (50), and adjusts the pen pressure when marking a workpiece with the marker (5) by adjusting the length of the compression coil spring (95) in the up-down direction.

Description

Technical Field

[0001] This invention relates to a marking device with a marking pen. Background Technology

[0002] For flat workpieces such as printed wiring boards, and for workpieces deemed defective during the inspection process, sometimes the defective areas are marked to analyze the causes of the defects. Manual marking is highly inefficient. Therefore, the following technology has been proposed: a marking device that automatically marks the defective areas of objects determined to be defective during the inspection process using a marker pen or similar marking pen (see Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2000-15170 Summary of the Invention

[0006] The nib of a marker pen is made of felt, synthetic fiber, or synthetic resin, and its shape or size can easily vary. Furthermore, in marker pens, ink is supplied to the nib via capillary action, making the ink supply to the nib prone to variation. Therefore, when marking with a marker pen, if the pen pressure is too low, the marking will be blurry; conversely, if the pen pressure is too high, the nib may be damaged, resulting in difficulties in achieving proper marking. However, Patent Document 1 does not disclose a solution to this problem.

[0007] In view of the above problems, the objective of the present invention is to provide a marking device that can make marks appropriately using a marking pen.

[0008] To address the aforementioned issues, the marking device of the present invention is characterized by having a marking unit comprising: a base; a vertical drive mechanism mounted on the base; a movable block driven vertically by the vertical drive mechanism; a marking head having a downward-pointing marking pen made of felt, synthetic fiber, or synthetic resin, and supported on the movable block in a manner capable of moving vertically; and a pen pressure adjustment mechanism comprising a helical spring that applies an upward force to the marking head against its own weight, the pen pressure adjustment mechanism adjusting the pen pressure when marking a workpiece with the marking pen by adjusting the length of the helical spring.

[0009] In this invention, a marking head including a marking pen is driven by an up-and-down drive mechanism, and the workpiece is marked using the tip of the marking pen. Furthermore, since an upward force against the weight of the marking head is applied to the marking head by a compression coil spring, the pen pressure is determined by the difference between the weight of the marking head and the force of the compression coil spring. Therefore, by adjusting the vertical length of the compression coil spring by the pen pressure adjustment mechanism, the force of the compression coil spring can be varied, thus allowing the pen pressure to be adjusted to an appropriate level. Therefore, it is possible to suppress the occurrence of blurring or pen tip damage during marking, and to mark appropriately with the marking pen.

[0010] In this invention, the following method can be adopted: the aforementioned helical spring is a compression helical spring arranged between the aforementioned marker head and the aforementioned movable block in a compressed state in the vertical direction; the aforementioned pen pressure adjustment mechanism includes: a first spring support member provided on the aforementioned marker head; and a second spring support member fixed to the aforementioned movable block by a position adjustment fixing member, and the aforementioned compression helical spring is arranged between the portion of the aforementioned first spring support member that is opposed to the aforementioned first spring support member in the vertical direction; the vertical length of the aforementioned compression helical spring is adjusted by adjusting the vertical position of the aforementioned second spring support member fixed to the aforementioned movable block by the aforementioned fixing member.

[0011] In this invention, the following method can be adopted: the first spring support member includes: a shaft portion around which the compression coil spring is disposed; and a support portion protruding from the upper end of the shaft portion and abutting against the upper end of the compression coil spring; the second spring support member includes: a first plate portion fixed to the movable block at a midpoint in the vertical direction by the fixing member; and a second plate portion bent from the first plate portion and abutting against the lower end of the compression coil spring.

[0012] In this invention, the following approach can be adopted: a rotary drive mechanism mounted on the base is provided, the marking head includes a pen holder for holding the marking pen, the pen holder including: a disc-shaped inner member that holds the marking pen at an eccentric position radially offset from the center; and an outer member that supports the inner member via a radial bearing so that it can rotate about a rotation center axis extending vertically through the center of the inner member, and the rotary drive mechanism causes the inner member to rotate about the rotation center axis. According to this approach, since it can move in an arc shape on the workpiece, arc-shaped or circular markings can be applied to the workpiece.

[0013] In this invention, the inner component comprises: a disk-shaped first component that holds the marking pen at an off-center position radially offset from the center; and a second component that is supported on the outer component via a radial bearing in a manner rotatable about the rotation axis, and the first component is fixed at the off-center position radially offset from the rotation axis, wherein the angular position of the first component when fixed to the second component can be changed. According to this method, since the distance between the rotation axis and the pen tip varies depending on the angular position of the first component fixed to the second component, the radius of curvature of the mark attached to the workpiece can be varied.

[0014] In this invention, a cap is held on the base, which covers the pen tip while the marking head is in standby position. This method can suppress the evaporation or solidification of ink from the pen tip.

[0015] In this invention, the cap can be positioned such that it has an annular sealing member that abuts against the outer peripheral surface of the marker pen or the lower surface of the pen holder. This arrangement effectively suppresses the evaporation or solidification of ink from the pen tip.

[0016] In this invention, a monitoring device is held on the base to monitor markings made on the workpiece by the marking pen. According to this method, the occurrence of blurring can be predicted based on the monitoring results of the markings attached to the workpiece.

[0017] In this invention, the workpiece is flat and has a drive mechanism that moves the workpiece and the marking unit relative to each other in two directions that intersect in the plane of the workpiece. According to this method, a predetermined position on the workpiece can be marked.

[0018] Invention Effects

[0019] In this invention, a marking head including a marking pen is driven by an up-and-down drive mechanism, and the pen tip is used to mark the workpiece. Furthermore, since an upward force against the weight of the marking head is applied to the marking head by a compression coil spring, the pen pressure can be determined by the difference between the weight of the marking head and the force of the compression coil spring. Therefore, by adjusting the vertical length of the compression coil spring by the pen pressure adjustment mechanism, the force of the compression coil spring can be varied, thus allowing the pen pressure to be adjusted to an appropriate level. Therefore, it is possible to suppress the occurrence of blurring or pen tip damage during marking, and to mark appropriately with the marking pen. Attached Figure Description

[0020] Figure 1This is an explanatory diagram of a mark attached to the marking device according to Embodiment 1 of the present invention.

[0021] Figure 2 This is a side view of the marking device according to Embodiment 1 of the present invention.

[0022] Figure 3 It is shown Figure 2 Side view of the up and down drive mechanism of the marking unit shown.

[0023] Figure 4 It is shown Figure 2 The front view of the rotary drive mechanism of the marking unit shown.

[0024] Figure 5 yes Figure 2 An explanatory diagram of the cap and other parts of the marking device shown.

[0025] Figure 6 yes Figure 2 The diagram illustrates the standby state of the marker unit shown.

[0026] Figure 7 yes Figure 2 The diagram illustrates the marking state of the marked unit.

[0027] Figure 8 This is an explanatory diagram of the marking device according to Embodiment 2 of the present invention.

[0028] Figure 9 From Figure 8 The diagram shown illustrates the change in the radius of curvature of the marker. Detailed Implementation

[0029] The embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, in the following description, three mutually orthogonal directions will be referred to as the X-axis, Y-axis, and Z-axis directions. The X-axis direction is the width direction, the Y-axis direction is the front-to-back direction, and the Z-axis direction is the up-to-down direction.

[0030] [First Implementation Method]

[0031] (Overall structure)

[0032] Figure 1 This is an explanatory diagram of the mark M attached to the mark device 1 according to Embodiment 1 of the present invention. Figure 2 This is a side view of the marking device 1 according to Embodiment 1 of the present invention.

[0033] exist Figure 1In the process of inspecting flat workpieces W, such as display panels or printed circuit boards, workpieces deemed defective during the inspection process are sometimes marked at the location where the defect occurred to analyze the cause of the defect. The mark M is formed to surround the location where the defect occurred. In this embodiment, the mark M is an arc or a circle. In this embodiment, the mark M is an arc with a portion M0 missing in the circumferential direction.

[0034] like Figure 2 As shown, the marking device 1 has a workpiece mounting surface 2 for placing the workpiece W and a marking unit 10 for marking the workpiece W, positioned above the machine base 3. The marking device 1 includes a drive mechanism that allows the marking unit 10 and the workpiece W to move relative to each other along the X-axis and Y-axis directions, intersecting each other in the in-plane direction of the workpiece W. For example, as... Figure 2 As indicated by arrows X0 and Y0, the marking device 1 includes an X-axis drive mechanism 11 that drives the marking unit 10 in the X-axis direction and a Y-axis drive mechanism 12 that drives the marking unit 10 in the Y-axis direction. The workpiece W is placed directly or in a pallet or similar container on the workpiece placement surface 2. After the workpiece W is inspected, for example, by an inspection device different from the marking device 1, only workpieces with defects are transported to the workpiece placement surface 2 by a robot or similar device, and then marked by the marking unit 10. Figure 1 The mark M is shown. Additionally, sometimes when inspecting workpiece W with the inspection equipment placed on workpiece mounting surface 2, if a defect occurs, the mark unit 10 is used to attach a mark. Figure 1 The mark M is shown. In any case, the inspection equipment outputs the XY coordinates of the part of the workpiece W where the defect occurs to the marking device 1, and the marking device 1 attaches the mark M at the position corresponding to the XY coordinates output from the inspection equipment. In addition, one workpiece W is placed on the workpiece mounting surface 2, but sometimes multiple workpieces W are placed.

[0035] (Structure of marker unit 10)

[0036] Figure 3 It is shown Figure 2 Side view of the up-down drive mechanism 30 of the marking unit 10 shown. Figure 4 It is shown Figure 2 The front view of the rotary drive mechanism 70 of the marking unit 10 shown. Figure 5 yes Figure 2 Explanation diagram of the cap 80, etc. of the marking device 1 shown.

[0037] like Figure 3 and Figure 4As shown, the marking unit 10 includes: a base 20 supporting the components described below; a vertical drive mechanism 30 fixed to a vertical plate 201 of the base 20; a movable block 40 driven in the vertical direction relative to the base 20 by the vertical drive mechanism 30; and a marking head 50 movably supported on the movable block 40 in the vertical direction. The base 20 includes a vertical plate 201 and horizontal plates 202, 203, etc., which are horizontally bent at the ends of the vertical plate 201. The vertical drive mechanism 30 is a fluid pressure cylinder device 31 with the movable block 40 connected below and fixed to the vertical plate 201 of the base 20. The marking head 50 includes a marking pen 5 with a downward-facing nib 5a made of felt, synthetic fiber, or synthetic resin, and the marking pen 5 is a type of pen that can be appropriately replenished with oil-based ink.

[0038] The marking head 50 includes a pen holder 51 for holding the marking pen 5. The pen holder 51 includes: a disc-shaped inner part 52 that holds the marking pen 5 in an off-center position radially offset from the center; and an outer part 54 that supports the inner part 52 via a cylindrical radial bearing 53 so that it can rotate about a rotational axis L that passes through the center of the inner part 52 and extends in the vertical direction.

[0039] like Figure 5 As shown, the inner component 52 includes: a first component 521 consisting of a cylindrical collar that holds the pen holder 51 inside; a second component 522 fixed to the inner side of the first component 521 by bolts 592; and a stop 523 fixed to the lower end of the first component 521 by bolts 593, the stop 523 engaging with the front end of the marker pen 5. Therefore, although the marker pen 5 can be inserted into the inner side of the first component 521 from above, the stop 523 prevents the marker pen 5 from falling downwards from the first component 521. Additionally, a support plate 590 supporting the radial bearing 53 is fixed to the second component 522 by bolts 591.

[0040] Refer again Figure 3 and Figure 4 In the marking head 50, a vertical axis 56 extends upward from the outer component 54, and a cylindrical component 41 is fixed to the movable block 40. This cylindrical component 41 supports the vertical axis 56 of the pen holder 51 so that it can move vertically. Therefore, the marking head 50 is movably supported on the movable block 40 via the vertical axis 56.

[0041] In the pen holder 51, the outer part 54 is not rotatable due to the vertical axis 56 and the cylindrical part 41.

[0042] The stop 57, which abuts against the cylindrical member 41 from above, abuts against the upper end of the vertical shaft 56. Therefore, when the fluid pressure cylinder device 31 lowers the movable block 40, the marking head 50, including the pen holder 51, descends due to its own weight as the vertical shaft 56 is guided by the cylindrical member 41. Conversely, when the fluid pressure cylinder device 31 raises the movable block 40, the marking head 50 rises. In this embodiment, two sets of vertical shafts 56, cylindrical members 41, and stop 57 are arranged around the marking pen 5 between the outer member 54 and the movable block 40.

[0043] A shock absorber 26 is provided between the base 20 and the movable block 40. The shock absorber 26 reduces the descent speed of the movable block 40 when it descends. A vertical plate 42 is connected to the movable block 40 adjacent to the fluid pressure cylinder device 31, and a shock absorber 27 is provided between the vertical plate 42 and the base 20. The shock absorber 27 reduces the rising speed of the movable block 40 when it rises, and also functions as a stop to determine the rising position of the movable block 40.

[0044] The marking unit 10 has a rotary drive mechanism 70 mounted on a horizontal plate 202 of the base 20. The rotary drive mechanism 70 rotates the inner component 52 of the pen holder 51 about the rotation center axis L. More specifically, a vertical shaft 55 extends upward from the inner component 52. On the other hand, the rotary drive mechanism 70 includes a rotary actuator 71, a horizontal plate 73 connected to the output shaft 72 of the rotary actuator 71, and a vertical plate 74 extending downward from the end of the horizontal plate 73. Two rollers 75 are mounted on the sides of the vertical plate 74, abutting against the vertical shaft 55 from both sides. Therefore, when the output shaft 72 of the rotary actuator 71 rotates and the horizontal plate 73 and the vertical plate 74 rotate about the rotation center axis L, the inner component 52 rotates together with the vertical shaft 55. In addition, a pressing member 58 is fixed on the vertical shaft 55, abutting against the upper end of the marking pen 5.

[0045] In the marking unit 10 configured in this way, the outer part 54 of the pen holder 51 is fixed, while the inner part 52 is connected to the rotation drive mechanism 70. Furthermore, the central axis L0 of the marking pen 5 is separated from the rotation center axis L. Additionally, the rotation drive mechanism 70 rotates the inner part 52 within an angle range of less than 360°. Therefore, as... Figure 1 As shown, the tip 5a of the marking pen 5 is able to attach a portion of the arc-shaped mark M missing in the circumferential direction M0 to the workpiece W.

[0046] (Structure of the pen pressure adjustment mechanism 90)

[0047] exist Figure 3In the marking unit 10, the weight G of the marking head 50 causes the tip 5a of the marking pen 5 to come into contact with the workpiece W for marking. In this embodiment, a coil spring 94 is disposed between the movable block 40 and the marking head 50, and the coil spring 94 applies an upward force S to the marking head 50 against its own weight G. Therefore, the force exerted by the pen tip 5a against the workpiece W when marking the workpiece W, i.e., the pen pressure, is obtained by subtracting the force S of the coil spring 94 from the weight G of the marking head 50.

[0048] The marking unit 10 is provided with a pen pressure adjustment mechanism 90, which uses a helical spring 94 to adjust the pen pressure when marking the workpiece W with the marking pen 5.

[0049] The pen pressure adjustment mechanism 90 adjusts the force S by adjusting the length of the spiral spring 94, thereby adjusting the pen pressure.

[0050] In this embodiment, the coil spring 94 is a compression coil spring 95 configured between the movable block 40 and the marker head 50 in a compressed state along the vertical direction. The pen pressure adjustment mechanism 90 includes the compression coil spring 95, a first spring support member 91 fixed to the marker head 50, and a second spring support member 92 fixed to the movable block 40 by a position adjustment fixing member 93. The compression coil spring 95 is configured between the vertically opposite portions of the first spring support member 91 and the second spring support member 92. Therefore, the vertical length of the compression coil spring 95 is adjusted by the vertical position of the second spring support member 92 when it is fixed to the movable block 40 by the fixing member 93.

[0051] More specifically, the first spring support member 91 has: a shaft portion 911 around which a compression coil spring 95 is disposed; and a support portion 912 that protrudes from the upper end of the shaft portion 911 and abuts against the upper end of the compression coil spring 95. The second spring support member 92 has: a first plate portion 921 fixed to the movable block 40 at a midpoint in the vertical direction by a fixing member 93; and a second plate portion 922 bent from the lower end of the first plate portion 921 and abutting against the lower end of the compression coil spring 95, the compression coil spring 95 being disposed in a compressed state between the support portion 912 of the first spring support member 91 and the second plate portion 922 of the second spring support member 92. The fixing member 93 is a bolt. An elongated hole 923 extending in the vertical direction is provided on the second plate portion 922, and a threaded hole for the fixing member 93 to stop is formed on the side of the movable block 40. Therefore, within the vertical range of the elongated hole 923, the vertical position of the second spring support member 92 when it is fixed to the movable block 40 by the fixing member 93 can be adjusted.

[0052] In the pen pressure adjustment mechanism 90 of this embodiment, there are two sets of compression coil springs 95, a first spring support component 91, a second spring support component 92, and a fixing component 93.

[0053] In this pen pressure adjustment mechanism 90, the height h of the upper part of the second spring support member 92 from the upper surface of the movable block 40 is adjusted. For example, when the weight G of the marker head 50 is 850g, the free length of the compression coil spring 95 is 45mm, and the spring constant of each compression coil spring 95 is 81g / mm, the compression length (mm) of the compression coil spring 95, the force S of the two compression coil springs 95, and the pen pressure (g) when the height h is changed are as follows.

[0054]

[0055]

[0056] Therefore, for example, if the appropriate pen pressure is 445g, the optimal pen pressure can be achieved by setting the height h to 28mm. This reduces the likelihood of ink blurring or nib deformation during marking.

[0057] (Structure of monitoring device 60)

[0058] In the marking unit 10, a monitoring device 60 for monitoring the mark M marked on the workpiece W by the marking pen 5 is held on the base 20. The monitoring device 60 monitors the degree of blurring of the mark M, etc., and detects the timing of replenishing ink to the marking pen 5.

[0059] In this embodiment, a monitoring device 60 is held at the lower end of a support shaft 65 fixed to a horizontal plate 202 on a base 20. The monitoring device 60 is located to the side of the marking head 50. The monitoring device 60 is a camera that captures the marking M, and is tilted at an angle of about 5° in a manner that allows for proper monitoring of the surface of the workpiece W.

[0060] (Structure of Cap 80)

[0061] exist Figure 4 In the marking device 1, a cap 80 covers the pen tip 5a from below when the marking head 50 is in standby mode above. The cap 80 is located via... Figure 4 The connecting parts 86, 87, 88, and 89 shown are fixed to the... Figure 2 The machine base 3 shown is located on the support column 4 extending upwards, and below the marking head 50. In addition, a Y-axis drive mechanism 12 for driving the marking unit 10 in the Y-axis direction is provided between the connecting member 86 and the horizontal plate 203 of the base 20.

[0062] The cap 80 has an annular sealing member 82 at the opening edge of the recess 81 that houses the pen tip 5a, which abuts against the outer peripheral surface of the marking pen 5. The sealing member 82 is made of rubber or the like. Here, the cap 80 is located below the marking head 50, but the marking device 1 is provided with a vertical drive mechanism 30 that drives the marking head 50 in the vertical direction and a Y-axis drive mechanism 12 that drives the marking unit 10 in the Y-axis direction. Therefore, when marking the workpiece W, the marking head 50 can move vertically in a position that avoids the cap 80, and in the standby position, the marking head 50 can move vertically in a position that overlaps with the cap 80 in the vertical direction, thereby performing installation onto and removal from the cap 80. In addition, the pen holder 51 is described later. Figure 8 and Figure 9 In the case shown, the annular sealing member 82 can also be provided in a manner that abuts against the lower surface of the pen holder.

[0063] (action)

[0064] Figure 6 yes Figure 2 The diagram illustrates the standby state of the marker unit 10 shown. Figure 7 yes Figure 2 An explanatory diagram of the marking state of the marking unit 10 shown.

[0065] In the marking device 1 of this embodiment, the up-down drive mechanism 30 switches the height position of the marking head 50 to three stages: the top, the bottom, and the middle. Figure 4 The illustration shows the marker head 50 at the top, with the pen tip 5a not mounted on the cap 80.

[0066] When the up-and-down drive mechanism 30 lowers the movable block 40 from the above-described state, the marker head 50 descends. As a result, as... Figure 6 As shown, the pen tip 5a is embedded inside the recess 81 of the cap 80, forming a standby state where the sealing member 82 abuts against the outer peripheral surface of the marking pen 5. Therefore, in the standby state, it is less likely for ink from the pen tip 5a to evaporate or solidify.

[0067] In the above state, when the up-and-down drive mechanism 30 raises the movable block 40, the marking head 50 rises to the top, becoming... Figure 4 The state shown. Next, when the Y-axis drive mechanism 12 drives the marker head 50 along the Y-axis direction, the marker head 50 moves to a position where it does not overlap with the cap 80 in the vertical direction. Next, when the vertical drive mechanism 30 lowers the movable block 40, as shown... Figure 7As shown, the marking head 50 descends to its lowest point, and the pen tip 5a abuts against the workpiece W. At this time, the pen tip 5a abuts against the workpiece W with the optimal pen pressure set by the pen pressure adjustment mechanism 90. Therefore, when the rotation drive mechanism 70 rotates the inner part 52 of the pen holder 51 about the rotation center axis L, a marking M can be attached to the workpiece W.

[0068] After marking is completed, the up-down drive mechanism 30 raises the marking head 50 to its highest position, and then the Y-axis drive mechanism 12 moves the marking head 50 to a position directly above the cap 80. Then, as... Figure 6 As shown, the up-down drive mechanism 30 lowers the marker head 50 to the middle position. As a result, the marker head 50 returns to the standby state.

[0069] [Implementation Method 2]

[0070] Figure 8 This is an explanatory diagram of the marking device 1 according to Embodiment 2 of the present invention. Figure 9 From Figure 8 The diagram illustrates the curvature radius of the state change marker M. Figure 8 and Figure 9 In the diagram, the marker head 50, pen holder 51, and first component 521 are enlarged and schematically shown. However, in... Figure 8 and Figure 9 In the cross-section of the marking head 50 shown at the top, the cut-off position of the marking head 50 is set at the position showing each component. Additionally, in... Figure 8 and Figure 9 In the diagram, a white circle indicates the center O52 of the inner component 52 (the center of the second component 522) through which the rotation center axis L passes, a black circle indicates the position O5 through which the central axis L0 of the marker pen 5 passes, and a "+" sign indicates the center O521 of the first component 521. Furthermore, the basic structure of this embodiment is the same as that of Embodiment 1; therefore, the same reference numerals are used for common parts, and their descriptions are omitted.

[0071] like Figure 8 As shown, in this embodiment, similar to Embodiment 1, the pen holder 51 includes: a disc-shaped inner member 52 that holds the marker pen 5 at an eccentric position radially offset from the center O52; and an outer member 54 that supports the inner member 52 via a cylindrical radial bearing 53 so that it can rotate about a rotational axis L that passes through the center of the inner member 52 and extends in the vertical direction. The inner member 52 has: a first member 521 consisting of a cylindrical collar that holds the pen holder 51 inside; a second member 522 that fixes the first member 521 inside; and a stop 523 fixed to the lower end of the first member 521, the stop 523 engaging with the front end of the marker pen 5.

[0072] Here, the center O52 of the inner component 52 is the position through which the rotational axis L passes, and coincides with the center of the second component 522. The first component 521 holds the marker pen 5 at an off-center position radially offset from the center O521, and the second component 522 is supported on the outer component 54 via a radial bearing 53 in a manner that allows it to rotate about the rotational axis L. Furthermore, the first component 521 is fixed to the second component 522 at an off-center position radially offset from the rotational axis L by bolts 592. Additionally, a portion of the multiple bolts 592 fixed to the second component 522 are embedded inside the arc-shaped guide groove 521a of the first component 521, forming a circumferential guide shaft.

[0073] Here, the direction in which the center O521 of the first component 521 is offset relative to the center of the second component 522 (the center O52 of the inner component 52) ​​is opposite to the direction in which the central axis L0 of the marker pen 5 is offset relative to the center O521 of the first component 521. Therefore, the distance d0 that the marker pen 5 is offset relative to the rotation center axis L is, as shown below, a value obtained by subtracting the distance d2 that the marker pen 5 is offset relative to the first component 521 from the distance d1 that the first component 521 is offset relative to the second component 522.

[0074] d0 = d1 - d2

[0075] For example, when the distance d1 at which the first component 521 is offset relative to the second component 522 is 4.5 mm and the distance d2 at which the marker pen 5 is offset relative to the first component 521 is 2 mm, the distance d0 at which the marker pen 5 is offset relative to the second component 522 is 2.5 mm. Therefore, Figure 1 The radius of curvature of the mark M shown is 2.5 mm.

[0076] In this embodiment, when the first component 521 is fixed to the second component 522, the fixing position of the bolt 592 is set in a manner that allows the angular direction of the first component 521 to be changed. Therefore, as... Figure 9 As shown, the direction in which the center O521 of the first component 521 is offset relative to the center of the second component 522 (the center O52 of the inner component 52) ​​can be set to the same side as the direction in which the central axis L0 of the marker pen 5 is offset relative to the center O521 of the first component 521. In this case, the distance d0 that the marker pen 5 is offset relative to the rotation center axis L is, as shown below, a value obtained by adding the distance d1 that the first component 521 is offset relative to the second component 522 to the distance d2 that the marker pen 5 is offset relative to the first component 521.

[0077] d0 = d1 + d2

[0078] Therefore, when the distance d1 of the first component 521 offset from the second component 522 is 4.5 mm and the distance d2 of the marker pen 5 offset from the first component 521 is 2 mm, the distance d0 of the marker pen 5 offset from the second component 522 is 6.5 mm. Figure 1 The radius of curvature of the marker M shown is 6.5 mm.

[0079] Therefore, by changing the angular position when the first component 521 is fixed on the second component 522, the radius of curvature of the mark M can be changed.

[0080] [Other Implementation Methods]

[0081] In the above embodiment, the mark M is an arc shape with a portion of M0 missing in the circumferential direction, but it can also be a structure with an additional circular mark M. Furthermore, in the above embodiment, the marking pen 5 is rotated when the mark M is attached, but in marking devices where the pen tip 5a contacts the workpiece W without rotating the marking pen 5, the present invention can also be applied when adjusting the pen pressure.

[0082] Figure Labels

[0083] 1…marking device; 2…workpiece placement surface; 20…base; 3…machine base; 5…marking pen; 5a…pen tip; 10…marking unit; 11…X-axis drive mechanism; 12…Y-axis drive mechanism; 30…up and down drive mechanism; 31…fluid pressure cylinder device; 40…movable block; 50…marking head; 51…pen holder; 54…outer component; 52…inner component; 53…radial bearing; 60…monitoring device; 70…rotary drive mechanism; 71…rotary actuator; 80…cap ; 81…recess; 82…sealing component; 90…pen pressure adjustment mechanism; 91…first spring support component; 92…second spring support component; 93…fixing component; 94…coil spring; 95…compression coil spring; 521…first component; 522…second component; 911…shaft; 912…support component; 921…first plate; 922…second plate; 923…elongated hole; G…self-weight; L…rotation center axis; L0…center axis; M…mark; S…force applied.

Claims

1. A marking device, characterized in that, It has a marking unit. The marking unit includes: Base; An up-and-down drive mechanism is mounted on the base; A movable block, which is driven in the vertical direction by the up-down driving mechanism; A marking head comprising a downward-pointing marking pen made of felt, synthetic fiber, or synthetic resin, and movably supported on the movable block in a vertical direction; and The pen pressure adjustment mechanism includes a helical spring that applies an upward force to the marking tip against its own weight. The mechanism adjusts the pen pressure when marking a workpiece using the marking pen by adjusting the length of the helical spring. It has a rotary drive mechanism mounted on the base. The marking head includes a pen holder that holds the marking pen. The pen holder includes: a disc-shaped inner component that holds the marker pen in an off-center position radially offset from the center; and an outer component that supports the inner component via a radial bearing, enabling it to rotate about a rotational axis passing through the center of the inner component and extending vertically. The rotary drive mechanism causes the inner component to rotate about the rotation center axis.

2. The marking device according to claim 1, characterized in that, The helical spring is a compression helical spring configured between the marking head and the movable block in a compressed state in the vertical direction. The pen pressure adjustment mechanism includes: a first spring support member disposed on the marker head; and a second spring support member fixed to the movable block by a position adjustment fastener, and a compression coil spring disposed between the portion of the second spring support member and the portion of the first spring support member opposite each other in the vertical direction. The vertical length of the compression coil spring is adjusted by adjusting the vertical position of the second spring support member, which is fixed to the movable block by the fixing member.

3. The marking device according to claim 2, characterized in that, The first spring support member includes: a shaft portion around which the compression coil spring is disposed; and a support portion protruding from the upper end of the shaft portion and abutting against the upper end of the compression coil spring. The second spring support member has: a first plate portion, the midpoint of which is fixed to the movable block by the fixing member; and a second plate portion, which is bent from the first plate portion and abuts against the lower end of the compression coil spring.

4. The marking device according to any one of claims 1 to 3, characterized in that, The inner component includes: a disk-shaped first component that holds the marker pen at an off-center position radially offset from the center; and a second component supported on the outer component via the radial bearing in a manner rotatable about the rotational axis, and the first component fixed at the off-center position radially offset from the rotational axis. The first component can change its angular position when it is fixed to the second component.

5. The marking device according to any one of claims 1 to 3, characterized in that, A cap is held on the base, which covers the pen tip while the marking head is in standby position above.

6. The marking device according to claim 5, characterized in that, The cap has an annular sealing component that abuts against the outer peripheral surface of the marking pen or the lower surface of the pen holder.

7. The marking device according to any one of claims 1 to 3, characterized in that, A monitoring device is held on the base to monitor the markings made on the workpiece by the marking pen.

8. The marking device according to any one of claims 1 to 3, characterized in that, The workpiece is flat. It has a driving mechanism that causes the workpiece and the marking unit to move relative to each other in two directions that intersect in the in-plane direction of the workpiece.

9. A marking device, characterized in that, It has a marking unit. The marking unit includes: Base; An up-and-down drive mechanism is mounted on the base; A movable block, which is driven in the vertical direction by the up-down driving mechanism; A marking head comprising a downward-pointing marking pen made of felt, synthetic fiber, or synthetic resin, and movably supported on the movable block in a vertical direction; and The pen pressure adjustment mechanism includes a helical spring that applies an upward force to the marking tip against its own weight. The mechanism adjusts the pen pressure when marking a workpiece using the marking pen by adjusting the length of the helical spring. The helical spring is a compression helical spring configured between the marking head and the movable block in a compressed state in the vertical direction. The pen pressure adjustment mechanism includes: a first spring support member disposed on the marker head; and a second spring support member fixed to the movable block by a position adjustment fastener, and a compression coil spring disposed between the portion of the second spring support member and the portion of the first spring support member opposite each other in the vertical direction. The vertical length of the compression coil spring can be adjusted by adjusting the vertical position of the second spring support member, which is fixed to the movable block by the fixing member. The first spring support member includes: a shaft portion around which the compression coil spring is disposed; and a support portion protruding from the upper end of the shaft portion and abutting against the upper end of the compression coil spring. The second spring support member has: a first plate portion, the midpoint of which is fixed to the movable block by the fixing member; and a second plate portion, which is bent from the first plate portion and abuts against the lower end of the compression coil spring.

10. The marking device according to claim 9, characterized in that, A cap is held on the base, which covers the pen tip while the marking head is in standby position above.

11. The marking device according to claim 10, characterized in that, The marking head includes a pen holder that holds the marking pen. The cap has an annular sealing component that abuts against the outer peripheral surface of the marking pen or the lower surface of the pen holder.

12. The marking device according to claim 9, characterized in that, A monitoring device is held on the base to monitor the markings made on the workpiece by the marking pen.

13. The marking device according to claim 9, characterized in that, The workpiece is flat. It has a driving mechanism that causes the workpiece and the marking unit to move relative to each other in two directions that intersect in the in-plane direction of the workpiece.

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