JP7629317B2 - Marking Device - Google Patents

Description

The present invention relates to a marking device equipped with a marking pen.

For flat workpieces such as printed wiring boards, if a product is determined to be defective during the inspection process, the location of the defect may be marked, and the cause of the defect may be analyzed. Marking in this manner by hand is extremely inefficient. Therefore, a technology has been proposed in which a marking device automatically marks the location of the defect using a marking pen such as a felt-tip pen for products determined to be defective during the inspection process (see Patent Document 1).

JP 2000-15170 A

Marking pens have a tip made of felt, synthetic fiber, or synthetic resin, and the shape and dimensions of the tip are prone to change. In addition, with marking pens, ink is supplied to the tip by capillary action, so the supply of ink to the tip is prone to change. For this reason, when marking with a marking pen, if the pen pressure is too low, the mark will be scratched, while if the pen pressure is too high, the pen tip will be crushed, making it difficult to mark properly. However, Patent Document 1 does not disclose any measures to address these problems.

In view of the above problems, the objective of the present invention is to provide a marking device that can perform marking properly using a marking pen.

In order to solve the above problems, the marking device according to the present invention is characterized by having a marking unit including a base, a vertical drive mechanism mounted on the base, a movable block driven vertically by the vertical drive mechanism, a marking pen made of felt, synthetic fiber, or synthetic resin with a pen tip facing downward, a marking head supported on the movable block so as to be movable vertically, and a pen pressure adjustment mechanism including a coil spring that applies an upward biasing force to the marking head against the weight of the marking head, and that adjusts the pen pressure when marking a workpiece with the marking pen by adjusting the length of the coil spring.

In the present invention, a marking head including a marking pen is driven by a vertical drive mechanism, and the workpiece is marked with the tip of the marking pen. In addition, an upward biasing force against the weight of the marking head is applied to the marking head by a compression coil spring, and the pen pressure is determined by the difference between the weight of the marking head and the biasing force of the compression coil spring. Therefore, by adjusting the vertical length of the compression coil spring with the pen pressure adjustment mechanism, the biasing force of the compression coil spring can be changed, and the pen pressure can be adjusted to an appropriate level. Therefore, the occurrence of smearing and crushing of the pen tip during marking can be suppressed, and marking can be performed appropriately with the marking pen.

In the present invention, the coil spring is a compression coil spring arranged in a vertically compressed state between the marking head and the movable block, and the pen pressure adjustment mechanism includes a first spring support member provided on the marking head, and a second spring support member fixed to the movable block base by a position adjustment fixture, in which the compression coil spring is arranged between a portion facing the first spring support portion in the vertical direction, and a mode can be adopted in which the vertical length of the compression coil spring is adjusted by adjusting the vertical position of the second spring support member fixed to the movable block by the fixture.

In the present invention, the first spring support member may include an axis around which the compression coil spring is disposed, and a support portion that protrudes from the upper end side of the axis and against which the upper end of the compression coil spring abuts, and the second spring support member may include a first plate portion that is fixed to the movable block base at a midpoint in the vertical direction by the fixing device, and a second plate portion that is bent from the first plate portion and against which the lower end of the compression coil spring abuts.

In the present invention, the marking head has a rotation drive mechanism mounted on the base, the marking head includes a pen holder that holds the marking pen, the pen holder includes a disk-shaped inner member that holds the marking pen at an eccentric position radially displaced from the center, and an outer member that supports the inner member via a radial bearing so that the inner member can rotate about a rotation center axis that passes through the center of the inner member and extends in the vertical direction, and the rotation drive mechanism can adopt a mode that rotates the inner member about the rotation center axis. According to this mode, the workpiece can be moved in an arc, so that an arc-shaped or circular mark can be applied to the workpiece.

In the present invention, the inner member comprises a disk-shaped first member that holds the marking pen at an eccentric position radially displaced from the center, and a second member that is supported by the outer member rotatably around the rotation axis via the radial bearing and is fixed to the first member at an eccentric position radially displaced from the rotation axis, and the first member can be fixed to the second member in an eccentric position, and the first member can be fixed to the second member in an angular position that can be changed. According to this aspect, the distance between the rotation axis and the pen tip changes depending on the angular position when the first member is fixed to the second member, so that the radius of curvature of the mark to be made on the workpiece can be changed.

In the present invention, a configuration can be adopted in which a cap that covers the pen tip is held by the base while the marking head is waiting above. This configuration can prevent ink from evaporating or solidifying from the pen tip.

In the present invention, the cap may be provided with an annular sealing member that contacts the outer peripheral surface of the marking pen or the underside of the pen holder. This can effectively prevent ink from evaporating or solidifying from the pen tip.

In the present invention, a monitoring device that monitors the mark made on the workpiece by the marking pen can be held on the base. According to this aspect, the occurrence of scratching can be predicted based on the results of monitoring the mark made on the workpiece.

In the present invention, the workpiece is flat, and an embodiment can be adopted in which a drive mechanism is provided for moving the workpiece and the marking unit relatively in two directions intersecting the in-plane direction of the workpiece. According to this embodiment, marking can be performed at a predetermined position on the workpiece.

In the present invention, a marking head including a marking pen is driven by a vertical drive mechanism, and the workpiece is marked with the tip of the marking pen. In addition, an upward biasing force against the weight of the marking head is applied to the marking head by a compression coil spring, and the pen pressure is determined by the difference between the weight of the marking head and the biasing force of the compression coil spring. Therefore, by adjusting the vertical length of the compression coil spring with the pen pressure adjustment mechanism, the biasing force of the compression coil spring can be changed, and the pen pressure can be adjusted to an appropriate level. Therefore, the occurrence of smearing and crushing of the pen tip during marking can be suppressed, and marking can be performed appropriately with the marking pen.

3A and 3B are explanatory diagrams of marks made by the marking device according to the first embodiment of the present invention. 1 is a side view of a marking device according to a first embodiment of the present invention. FIG. 3 is a side view showing a vertical drive mechanism and the like of the marking unit shown in FIG. 2 . FIG. 3 is a front view showing a rotation drive mechanism and the like of the marking unit shown in FIG. 2 . 3 is an explanatory diagram of a cap and the like of the marking device shown in FIG. 2. FIG. 3 is an explanatory diagram of a standby state of the marking unit shown in FIG. 2 . FIG. 3 is an explanatory diagram of a marking state of the marking unit shown in FIG. 2 . FIG. 11 is an explanatory diagram of a marking device according to a second embodiment of the present invention. 9 is an explanatory diagram when the radius of curvature of the mark is changed from the state shown in FIG. 8 .

An embodiment of the present invention will be described with reference to the drawings. In the following description, three mutually orthogonal directions will be referred to as an X-axis direction, a Y-axis direction, and a Z-axis direction. The X-axis direction is the width direction, the Y-axis direction is the front-rear direction, and the Z-axis direction is the up-down direction.
[First embodiment]
(Overall composition)
Fig. 1 is an explanatory diagram of a mark M made by a marking device 1 according to a first embodiment of the present invention. Fig. 2 is a side view of the marking device 1 according to the first embodiment of the present invention.

In FIG. 1, in a flat workpiece W such as a display panel or a printed wiring board, if an item is determined to be defective in the inspection process, the location of the defect may be marked to analyze the cause of the defect. Mark M is formed to surround the location of the defect. In this embodiment, mark M is arc-shaped or circular. In this embodiment, mark M is arc-shaped with a portion M0 missing in the circumferential direction.

As shown in FIG. 2, the marking device 1 is provided with a workpiece placement surface 2 on which the workpiece W is placed, and a marking unit 10 for applying marking to the workpiece W, which are located above the machine base 3. The marking device 1 is provided with a drive mechanism for relatively moving the marking unit 10 and the workpiece W in the X-axis direction and the Y-axis direction that intersect with each other in the in-plane direction of the workpiece W. For example, as shown by arrows X0 and Y0 in FIG. 2, the marking device 1 is provided with an X-axis drive mechanism 11 for driving the marking unit 10 in the X-axis direction, and a Y-axis drive mechanism 12 for driving the marking unit 10 in the Y-axis direction. The workpiece W is placed on the workpiece placement surface 2 directly or after being placed on a tray or the like. After the workpiece W is inspected, for example, by an inspection device other than the marking device 1, only the workpiece W having a defect is transported to the workpiece placement surface 2 by a robot or the like, and then the marking unit 10 applies the mark M shown in FIG. 1 to the workpiece W. Also, the inspection equipment inspects the workpiece W while it is placed on the workpiece placement surface 2, and if a defect is found, the mark M shown in Fig. 1 may be placed by the marking unit 10. In either case, the inspection equipment outputs the XY coordinates of the location where the defect is occurring in the workpiece W to the marking device 1, and the marking device 1 places the mark M at a position corresponding to the XY coordinates output from the inspection equipment. Also, although one workpiece W is placed on the workpiece placement surface 2, multiple workpieces W may be placed thereon.

(Configuration of marking unit 10)
Fig. 3 is a side view showing the vertical drive mechanism 30 etc. of the marking unit 10 shown in Fig. 2. Fig. 4 is a front view showing the rotation drive mechanism 70 etc. of the marking unit 10 shown in Fig. 2. Fig. 5 is an explanatory diagram of the cap 80 etc. of the marking device 1 shown in Fig. 2.

As shown in Figs. 3 and 4, the marking unit 10 includes a base 20 that supports the various components described below, a vertical drive mechanism 30 fixed to a vertical plate 201 of the base 20, a movable block 40 that is driven vertically relative to the base 20 by the vertical drive mechanism 30, and a marking head 50 that is supported by the movable block 40 so as to be movable vertically. The base 20 includes a vertical plate 201, and horizontal plates 202 and 203 that are horizontally bent at the ends of the vertical plate 201. The vertical drive mechanism 30 is a fluid pressure cylinder device 31 to which the movable block 40 is connected below, and is fixed to the vertical plate 201 of the base 20. The marking head 50 includes a marking pen 5 made of felt, synthetic fiber, or synthetic resin, with a pen tip 5a facing downward, and the marking pen 5 is a type of pen that can be appropriately refilled with oil-based ink.

The marking head 50 includes a pen holder 51 that holds the marking pen 5. The pen holder 51 includes a disk-shaped inner member 52 that holds the marking pen 5 at an eccentric position radially displaced from the center, and an outer member 54 that rotatably supports the inner member 52 via a cylindrical radial bearing 53 around a central axis of rotation L that passes through the center of the inner member 52 and extends in the vertical direction.

As shown in FIG. 5, the inner member 52 includes a first member 521 made of a cylindrical collar that holds the pen holder 51 inside, a second member 522 to which the first member 521 is fixed inside by a bolt 592, and a stopper 523 fixed to the lower end of the first member 521 by a bolt 593, and the stopper 523 engages with the tip side of the marking pen 5. Therefore, the marking pen 5 can be inserted inside the first member 521 from above, but the stopper 523 prevents it from falling out of the first member 521 downward. A support plate 590 that supports the radial bearing 53 is fixed to the second member 522 by a bolt 591.

Referring again to Figures 3 and 4, in the marking head 50, a vertical shaft 56 extends upward from the outer member 54, and the movable block 40 has a cylindrical member 41 fixed thereto, which supports the vertical shaft 56 of the pen holder 51 so that it can move up and down. Therefore, the marking head 50 is supported by the movable block 40 via the vertical shaft 56 so that it can move up and down. In the pen holder 51, the outer member 54 cannot rotate due to the vertical shaft 56 and the cylindrical member 41.

A stopper 57 that 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 lowers by its own weight while the vertical shaft 56 is guided by the cylindrical member 41. Also, when the fluid pressure cylinder device 31 raises the movable block 40, the marking head 50 rises. In this embodiment, two sets of the vertical shaft 56, the cylindrical member 41, and the stopper 57 are provided around the marking pen 5 between the outer member 54 and the movable block 40.

A shock absorber 26 is provided between the base 20 and the movable block 40. The shock absorber 26 dampens the descent speed at the lowering end when the movable block 40 descends. A vertical plate 42 is connected to the movable block 40 so as to be 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 dampens the descent speed at the upper end when the movable block 40 ascends, and also acts as a stopper that determines the ascending position of the movable block 40.

The marking unit 10 has a rotation drive mechanism 70 mounted on the horizontal plate 202 of the base 20. The rotation drive mechanism 70 rotates the inner member 52 of the pen holder 51 around the rotation center axis L. More specifically, a vertical shaft 55 extends upward from the inner member 52, while the rotation 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 attached to the side of the vertical plate 74, which abut 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 around the rotation center axis L, the inner member 52 rotates together with the vertical shaft 55. A pressing member 58, which abuts against the upper end of the marking pen 5, is fixed to the vertical shaft 55.

In the marking unit 10 configured in this manner, the outer member 54 of the pen holder 51 is fixed, while the inner member 52 is connected to the rotation drive mechanism 70. The central axis L0 of the marking pen 5 is spaced apart from the central axis L of rotation. The rotation drive mechanism 70 rotates the inner member 52 through an angle range of less than 360°. Therefore, the pen tip 5a of the marking pen 5 can apply an arc-shaped mark M with a portion M0 missing in the circumferential direction to the workpiece W, as shown in FIG. 1.

(Configuration of pen pressure adjustment mechanism 90)
3, in the marking unit 10, the weight G of the marking head 50 is utilized to bring the pen tip 5a of the marking pen 5 into contact with the workpiece W to perform marking. In this embodiment, a coil spring 94 is disposed between the movable block 40 and the marking head 50, which applies an upward biasing force S to the marking head 50 against the weight G of the marking head 50. Therefore, the pen pressure, which is the force with which the pen tip 5a abuts against the workpiece W when marking the workpiece W, is a value obtained by subtracting the biasing force S of the coil spring 94 from the weight G of the marking head 50.

The marking unit 10 is provided with a pen pressure adjustment mechanism 90 that uses a coil spring 94 to adjust the pen pressure when marking the workpiece W with the marking pen 5. The pen pressure adjustment mechanism 90 adjusts the biasing force S by adjusting the length of the coil spring 94, thereby adjusting the pen pressure.

In this embodiment, the coil spring 94 is a compression coil spring 95 arranged in a vertically compressed state between the movable block 40 and the marking head 50. The pen pressure adjustment mechanism 90 includes the compression coil spring 95, a first spring support member 91 fixed to the marking head 50, and a second spring support member 92 fixed to the movable block 40 by a position adjustment fixture 93, and the compression coil spring 95 is arranged between the portions where the first spring support member 91 and the second spring support member 92 face each other in the vertical direction. Therefore, the vertical length of the compression coil spring 95 is adjusted depending on the vertical position of the second spring support member 92 when fixed to the movable block 40 by the fixture 93.

More specifically, the first spring support member 91 includes an axis portion 911 around which the compression coil spring 95 is disposed, and a support portion 912 that protrudes from the upper end side of the axis portion 911 and against which the upper end of the compression coil spring 95 abuts. The second spring support member 92 includes a first plate portion 921 whose middle position in the vertical direction is fixed to the movable block 40 by a fixing device 93, and a second plate portion 922 that is bent from the lower end of the first plate portion 921 and against which the lower end of the compression coil spring 95 abuts, and the compression coil spring 95 is disposed in a compressed state between the receiving portion 912 of the first spring support member 91 and the second plate portion 922 of the second spring support member 92. The fixing device 93 is a bolt. The second plate portion 922 is provided with an elongated hole 923 extending in the vertical direction, and a screw hole into which the fixing device 93 is fastened is formed on the side of the movable block 40. Therefore, the vertical position of the second spring support member 92 when fixed to the movable block 40 by the fixing device 93 can be adjusted within the vertical range of the long hole 923.

In this embodiment, the pen pressure adjustment mechanism 90 includes two sets of a compression coil spring 95, a first spring support member 91, a second spring support member 92, and a fixing device 93.

The pen pressure adjustment mechanism 90 adjusts the height h of the upper end portion of the second spring receiving member 92 from the upper surface of the movable block 40. For example, when the weight G of the marking head 50 is 850 g, the free length of the compression coil spring 95 is 45 mm, and the spring constant of each compression coil spring 95 is 81 g/mm, the compression length (mm) of the compression coil spring 95, the biasing force S of two compression coil springs 95, and the pen pressure (g) when the height h is changed are as follows:
Height h Compression length Force S Pen pressure 31 39.5 891 -41
30 40.5 729 121
29 41.5 567 283
28 42.5 405 445
27 43.5 117 733
26 44.5 52 798

Therefore, for example, if the appropriate pen pressure is 445 g, the optimal pen pressure can be achieved by setting the height h to 28 mm. Therefore, when marking, problems such as ink smearing and deformation of the pen tip 5a are unlikely to occur.

(Configuration of monitoring device 60)
In the marking unit 10, a monitoring device 60 that monitors 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 smearing of the mark M, etc., and detects the timing to refill the marking pen 5 with ink.

In this embodiment, the monitoring device 60 is held at the lower end of the support shaft 65 fixed to the horizontal plate 202 of the base 20, and is located to the side of the marking head 50. The monitoring device 60 is an imaging device that images the mark M, and is tilted at an angle of about 5° so that the surface of the workpiece W can be properly monitored.

(Configuration of Cap 80)
In Fig. 4, the marking device 1 has a cap 80 that covers the pen tip 5a from below while the marking head 50 is waiting above. The cap 80 is fixed to the support 4 extending upward from the machine base 3 shown in Fig. 2 via connecting members 86, 87, 88, and 89 shown in Fig. 4, and is located below the marking head 50. Note that a Y-axis drive mechanism 12 that drives 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.

The cap 80 is provided with an annular seal member 82 that abuts against the outer peripheral surface of the marking pen 5 at the opening edge of the recess 81 in which the pen tip 5a is housed. The seal member 82 is made of rubber or the like. Here, the cap 80 is located below the marking head 50, and 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 be moved vertically at a position that avoids the cap 80, and in the standby position, the marking head 50 is moved vertically at a position that overlaps with the cap 80 in the vertical direction, thereby attaching it to the cap 80 and removing it from the cap 80. Note that, when the pen holder 51 is in the form shown in Figures 8 and 9 described later, an annular seal member 82 may be provided so as to abut against the lower surface of the pen holder.

(Operation)
Fig. 6 is an explanatory diagram of the standby state of the marking unit 10 shown in Fig. 2. Fig. 7 is an explanatory diagram of the marking state of the marking unit 10 shown in Fig. 2.

In this embodiment of the marking device 1, the vertical drive mechanism 30 switches the height position of the marking head 50 between three levels: the top end, the bottom end, and the middle. Figure 4 shows the marking head 50 at the top end, with the pen tip 5a not attached to the cap 80.

When the vertical drive mechanism 30 lowers the movable block 40 from this state, the marking head 50 also lowers. As a result, as shown in FIG. 6, the pen tip 5a fits inside the recess 81 of the cap 80, and the seal member 82 abuts against the outer circumferential surface of the marking pen 5, resulting in a standby state. Therefore, in the standby state, the ink is less likely to evaporate from the pen tip 5a or solidify.

In this state, when the vertical drive mechanism 30 raises the movable block 40, the marking head 50 rises to the top end, as shown in FIG. 4. Next, when the Y-axis drive mechanism 12 drives the marking head 50 in the Y-axis direction, the marking head 50 moves to a position where it does not overlap the cap 80 in the vertical direction. Next, when the vertical drive mechanism 30 lowers the movable block 40, the marking head 50 descends to the bottom end as shown in FIG. 7, and the pen tip 5a abuts against the workpiece W. At that 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 member 52 of the pen holder 51 around the rotation center axis L, a mark M is applied to the workpiece W.

After marking is completed in this manner, the vertical drive mechanism 30 raises the marking head 50 to the top end, and then the Y-axis drive mechanism 12 moves the marking head 50 to a position directly above the cap 80, and then, as shown in FIG. 6, the vertical drive mechanism 30 lowers the marking head 50 to the intermediate position. As a result, the marking head 50 is again in a standby state.

[Embodiment 2]
FIG. 8 is an explanatory diagram of the marking device 1 according to the second embodiment of the present invention. FIG. 9 is an explanatory diagram when the radius of curvature of the mark M is changed from the state shown in FIG. 8. In FIG. 8 and FIG. 9, the marking head 50, the pen holder 51, and the first member 521 are each enlarged and typically shown. However, in FIG. 8 and FIG. 9, in the cross section of the marking head 50 shown in the top row, the cutting position of the marking head 50 is set to the position where each member is shown. In addition, in FIG. 8 and FIG. 9, the center O52 (the center of the second member 522) of the inner member 52 through which the rotation central axis L passes is shown by a white circle, the position O5 through which the central axis L0 of the marking pen 5 passes is shown by a black circle, and the center O521 of the first member 521 is shown by a "+". Note that the basic configuration of this embodiment is the same as that of the first embodiment, so the same reference numerals are attached to the common parts and their description is omitted.

8, in this embodiment, as in the first embodiment, the pen holder 51 includes a disk-shaped inner member 52 that holds the marking pen 5 at an eccentric position radially displaced from the center O52, and an outer member 54 that supports the inner member 52 rotatably around a central axis L of rotation that passes through the center of the inner member 52 and extends in the vertical direction via a cylindrical radial bearing 53. The inner member 52 includes a first member 521 made of a cylindrical collar that holds the pen holder 51 inside, a second member 522 to which the first member 521 is fixed inside, and a stopper 523 fixed to the lower end of the first member 521, and the stopper 523 engages with the tip side of the marking pen 5.

Here, the center O52 of the inner member 52 is a position through which the central axis of rotation L passes, and coincides with the center of the second member 522. The first member 521 holds the marking pen 5 at an eccentric position radially offset from the center O521, and the second member 522 is supported by the outer member 54 via a radial bearing 53 so as to be rotatable around the central axis of rotation L. The first member 521 is fixed to the second member 522 by bolts 592 at an eccentric position radially offset from the central axis of rotation L. Some of the bolts 592 among the multiple bolts 592 fastened to the second member 522 fit inside the arc-shaped guide groove 521a of the first member 521 to form a circumferential guide shaft.

Here, the direction in which the center O521 of the first member 521 is misaligned with respect to the center of the second member 522 (the center O52 of the inner member 52) is opposite to the direction in which the central axis L0 of the marking pen 5 is misaligned with respect to the center O521 of the first member 521. Therefore, the distance d0 by which the marking pen 5 is misaligned with respect to the central axis L of rotation is a value obtained by subtracting the distance d2 by which the marking pen 5 is misaligned with respect to the first member 521 from the distance d1 by which the first member 521 is misaligned with respect to the second member 522, as shown below.
d0=d1-d2

For example, if the distance d1 by which the first member 521 is misaligned relative to the second member 522 is 4.5 mm, and the distance d2 by which the marking pen 5 is misaligned relative to the first member 521 is 2 mm, then the distance d0 by which the marking pen 5 is misaligned relative to the second member 522 is 2.5 mm. Therefore, the radius of curvature of the mark M shown in FIG. 1 is 2.5 mm.

In this embodiment, the fixing position of the bolt 592 and the like are set so that the angular direction of the first member 521 can be changed when the first member 521 is fixed to the second member 522. Therefore, as shown in Fig. 9, the direction in which the center O521 of the first member 521 is shifted from the center of the second member 522 (the center O52 of the inner member 52) can be set to the same side as the direction in which the central axis L0 of the marking pen 5 is shifted from the center O521 of the first member 521. In this case, the distance d0 by which the marking pen 5 is shifted from the rotation central axis L is a value obtained by adding the distance d2 by which the marking pen 5 is shifted from the first member 521 to the distance d1 by which the first member 521 is shifted from the second member 522, as shown below.
d0=d1+d2

Therefore, if the distance d1 by which the first member 521 is misaligned relative to the second member 522 is 4.5 mm, and the distance d2 by which the marking pen 5 is misaligned relative to the first member 521 is 2 mm, the distance d0 by which the marking pen 5 is misaligned relative to the second member 522 is 6.5 mm. Therefore, the radius of curvature of the mark M shown in FIG. 1 is 6.5 mm.

Therefore, the radius of curvature of the mark M can be changed by changing the angular position when fixing the first member 521 to the second member 522.

[Other embodiments]
In the above embodiment, the mark M is an arc shape with a portion M0 missing in the circumferential direction, but it may be a configuration in which a circular mark M is applied. Also, in the above embodiment, the marking pen 5 is rotated when applying the mark M, but the present invention may be applied to a marking device of the type in which the pen tip 5a is brought into contact with the workpiece W without rotating the marking pen 5, in which the pen pressure is adjusted.

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

Claims (8)

With the base,
A vertical drive mechanism mounted on the base;
a movable block that is driven in the vertical direction by the vertical drive mechanism;
a marking head including a marking pen made of felt, synthetic fiber, or synthetic resin, the pen tip of which faces downward and is supported by the movable block so as to be movable in the vertical direction;
a pen pressure adjustment mechanism including a coil spring that applies an upward biasing force to the marking head against the weight of the marking head, and adjusts a pen pressure when marking a workpiece with the marking pen by adjusting a length of the coil spring;
A marking unit including :
the coil spring is a compression coil spring arranged in a vertically compressed state between the marking head and the movable block,
the pen pressure adjustment mechanism includes a first spring bearing member provided on the marking head, and a second spring bearing member fixed to the movable block by a position adjustment fixture, the second spring bearing member having the compression coil spring disposed between a portion facing the first spring bearing portion in the up-down direction,
A marking device, characterized in that the vertical length of the compression coil spring is adjusted by adjusting the vertical position of the second spring support member fixed to the movable block by the fixing device . 2. The marking device according to claim 1 ,
the first spring support member includes a shaft portion around which the compression coil spring is disposed, and a support portion that protrudes from an upper end side of the shaft portion and against which an upper end of the compression coil spring abuts;
This marking device is characterized in that the second spring support member comprises a first plate portion whose intermediate position in the vertical direction is fixed to the movable block by the fixing device, and a second plate portion bent from the first plate portion and against which the lower end of the compression coil spring abuts. With the base,
A vertical drive mechanism mounted on the base;
a movable block that is driven in the vertical direction by the vertical drive mechanism;
a marking head including a marking pen made of felt, synthetic fiber, or synthetic resin, the pen tip of which faces downward and is supported by the movable block so as to be movable in the vertical direction;
a pen pressure adjustment mechanism including a coil spring that applies an upward biasing force to the marking head against the weight of the marking head, and adjusts a pen pressure when marking a workpiece with the marking pen by adjusting a length of the coil spring;
A marking unit including:
A rotation drive mechanism is mounted on the base,
The marking head includes a pen holder for holding the marking pen,
The pen holder includes a disk-shaped inner member that holds the marking pen at an eccentric position radially displaced from a center, and an outer member that rotatably supports the inner member via a radial bearing around a rotation center axis that passes through a center of the inner member and extends in a vertical direction,
The marking device, wherein the rotation drive mechanism rotates the inner member about the central axis of rotation. 4. The marking device according to claim 3 ,
the inner member includes a disk-shaped first member that holds the marking pen at an eccentric position radially displaced from a center, and a second member that is supported by the outer member via the radial bearing so as to be rotatable around the rotation axis, and to which the first member is fixed at an eccentric position radially displaced from the rotation axis,
A marking device, characterized in that the angular position of the first member when fixed to the second member is changeable. With the base,
A vertical drive mechanism mounted on the base;
a movable block that is driven in the vertical direction by the vertical drive mechanism;
a marking head including a marking pen made of felt, synthetic fiber, or synthetic resin, the pen tip of which faces downward and is supported by the movable block so as to be movable in the vertical direction;
a pen pressure adjustment mechanism including a coil spring that applies an upward biasing force to the marking head against the weight of the marking head, and adjusts a pen pressure when marking a workpiece with the marking pen by adjusting a length of the coil spring;
A marking unit including:
A marking device characterized in that a cap covering the pen tip is held on the base while the marking head is waiting above. 6. The marking device according to claim 5 ,
The marking device according to claim 1, wherein the cap is provided with an annular sealing member that abuts against an outer peripheral surface of the marking pen or a lower surface of the pen holder. With the base,
A vertical drive mechanism mounted on the base;
a movable block that is driven in the vertical direction by the vertical drive mechanism;
a marking head including a marking pen made of felt, synthetic fiber, or synthetic resin, the pen tip of which faces downward and is supported by the movable block so as to be movable in the vertical direction;
a pen pressure adjustment mechanism including a coil spring that applies an upward biasing force to the marking head against the weight of the marking head, and adjusts a pen pressure when marking a workpiece with the marking pen by adjusting a length of the coil spring;
A marking unit including:
A marking device characterized in that a monitoring device for monitoring a mark made on the workpiece by the marking pen is held on the base. The marking device according to any one of claims 1 to 7 ,
The workpiece is flat,
A marking device comprising: a drive mechanism for relatively moving the workpiece and the marking unit in two directions intersecting an in-plane direction of the workpiece.

Images