JPH08300479A - Laser marking method, laser marking device and exhaust hood for laser light emitting apparatus - Google Patents

Abstract

PURPOSE: To realize the shortening of sign forming process, washing process and wiping process by a method wherein signs are formed on a marking surface by irradiat ing a work holding jig, on which work is held, with a laser irradiator and then some part of the work including the marking surface is washed by turning over the work holding jig and finally the resultant working surface is wiped. CONSTITUTION: In a working charging station S1, a work holding jig 20 is fixed by a positioning mechanism so as to transfer a resin molded article on the work holding jig 20. Then the resin molded article is carried by a line conveyor Ca to a striking-in station S2 so as to surely fit the resin molded article to the work holding jig 20 and further produce signs on the resin molded article with the laser light emitter 353 of a laser light irradiator 300 on the top face of the resin molded article at a marking station s3. Next, at a turning-over station S4, the resin molded article is turned over 180 deg.. Then, the resin molded article is moved in a washing tank under the condition that only the sign-formed surface is immersed in washing liquid at a washing station S5. Finally the sign-formed surface is wiped with wiping mechanism at a wiping station S6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser marking method for forming a code or the like on a resin molded product or the like by laser light, a laser marking device, and an exhaust hood for a laser light irradiation device used in this device or the like.

[0002]

2. Description of the Related Art As shown in FIG. 24, a resin molded product, particularly a resin molded product 1 used for an operation button member of a switch, is made of a transparent resin molded member 2 having a closed-bottomed bottom shape. Transparent white coating layer 3 and light-shielding black coating layer 4 on the surface
Are provided in a laminated manner, and the black coating layer 4 is partially removed by a laser light irradiator to form a code or a figure (hereinafter referred to as a code A). Conventionally, when forming such a code, an operator manually aligns and mounts the resin molded products 1 one by one on a mounting jig and carries the mounting jig directly below the laser light irradiator. The resin molded product 1 of this mounting jig was irradiated with laser light by XY scanning with a laser light irradiation machine. In FIG. 24, 5 is a lid member provided at the opening end of the resin molded product 1 to close the opening, and 6 is a light bulb. By assembling these lid member 5 and the light bulb 6, a switch operation button is completed. .

In the above-mentioned conventional laser light irradiator, the black coating layer 4 burns at the time of irradiating the laser light to generate smoke, and this smoke causes stains on the lens. For this reason, in such a laser beam irradiator, as shown in FIG. 25, the laser beam irradiator is placed on one side of the table 10 close to the work (resin molded article) 1 and orthogonal to the laser beam irradiation direction. The air blowing section 11 is provided, and the air suction section 12 is provided so as to face the air blowing section 12.
1 has a smoke exhaust structure in which wind is blown from the blower 13 and smoke is sucked by the air suction unit 12. In addition, in FIG.
Reference numeral 15 is a laser light emitter, 14 is an air filter, and W is a wind path.

[0004]

However, in the prior art, when forming the code of the resin molded product, the operator must manually arrange the resin molded products one by one on the mounting jig. However, there is a problem in that it requires a lot of man-hours, a lot of work time, and is an obstacle to automation. further,
In the above-mentioned laser light irradiator, the air blowing portion 1 is provided so as to face the direction orthogonal to the laser light irradiation direction.
1 and the air suction unit 12 discharge smoke, that is, smoke in an open space, so that a considerable amount of air must be blown from the air blower unit 11, and the blower 13 consumes a large amount of power and increases manufacturing costs. There was also a problem that it will be one of the causes.

The present invention has been made in view of the above problems, and is a laser marking device capable of automatically forming a code on a work such as a resin molded product with a small number of man-hours, a work holding jig used for the marking device, and a laser. An object is to provide a smoke exhaust structure for a light irradiator.

[0006]

In order to solve the above problems, a laser marking method according to the invention of claim 1 holds a plurality of works in alignment with a work holding jig with the marking surface facing upward. The work holding jig is transferred directly below the laser irradiator, and the marking surface of the work is irradiated with a laser by the laser irradiator to form a code on the marking processed surface, and then the work holding jig is inverted. Then, the marking surface of the workpiece is directed downward, a part of the workpiece including the marking surface is partially immersed in the cleaning liquid in the cleaning tank for cleaning, and then the marking surface of the workpiece is wiped. Configured to.

A laser marking device according to a second aspect of the present invention includes a work holding jig capable of fitting and holding a plurality of works by aligning marking surfaces of the plurality of works with a plurality of work holding portions, respectively. A conveyor that conveys the work holding jig and a conveyor that is arranged in parallel with the conveyer and restrains the work holding jig that is conveyed by the conveyor at a specified position,
The workpieces supplied in the aligned state are transferred by the transfer robot by the transfer robot, and the workpiece loading section that is fitted into the workpiece holding section of the workpiece holding jig at the specified position, and the workpieces are placed upward from the workpiece loading section. A hammering portion that lifts the workpiece holding jig loaded with the workpiece and presses the workpiece of the workpiece holding jig against the pressing member laid on the conveyor, and the workpiece holding jig loaded with the workpiece from the hammering portion is the conveyor. A marking part that is conveyed by the laser light irradiator to form a code on the upper surface of the work of the work holding jig, and the work holding jig that has been loaded from the marking part and is conveyed by the conveyor. An inversion part that inverts the tool and positions the work below the work holding jig; A jig is conveyed by the conveyor, and a portion where at least the code forming surface of the work is partly immersed in a cleaning liquid in a cleaning tank to perform ultrasonic cleaning, and a workpiece already loaded from the cleaning portion. A wiping unit that is conveyed by the conveyor in a state where the work holding jig is positioned on the lower side, and wipes the code forming surface by sliding the wiping member to the code forming surface of the work of the work holding jig. And

Further, the invention according to claim 3 is the same as claim 1.
3. The laser marking method according to claim 2, or the laser marking apparatus according to claim 2, wherein the work holding jig is composed of a plate-shaped member on which a plurality of cylindrical works are fitted and held at their opening ends. A plurality of work holding portions which are fitted into the open end portion of the work and are fitted and held on the one surface of the strip-shaped member are arranged and arranged. Still further, the invention according to claim 4 is the laser marking method or laser marking apparatus according to claim 3, wherein the work holding part is formed of a concave part having a shape substantially similar to the opening end of the work, and the concave part of the concave part is formed. The inner wall portion was dimensioned to have a tightening margin to which the inner portion of the end of the work fits, and the outer wall portion of the recess was dimensioned to have a gap between the outer surface portion of the end portion of the work.

According to a fifth aspect of the present invention, in the laser marking apparatus according to the second aspect, a paying-out portion for removing the work whose code forming surface has been wiped by the wiping portion from the work holding jig, and the paying-out portion. And a transfer mechanism for transferring the workpiece holding jig from the return conveyor to the conveyor, and a return mechanism for returning the workpiece holding jig from the section toward the starting end side of the conveyor. To be done.

Further, the invention according to claim 6 is an exhaust hood for a laser light irradiator, which is interposed between a laser light emitter and a work irradiated with the laser light from the laser light emitter. A tubular inner shell member capable of passing laser light inside is assembled in a tubular outer shell member to define a duct space having the work side opening between the outer shell member and the inner shell member, The duct space was connected to a negative pressure source.

[0011]

According to the laser marking method of the first aspect of the present invention, the workpiece held in alignment with the workpiece holding jig is irradiated with laser light to form a code, and then the workpiece holding jig is moved downward. Since it is inverted so that the workpiece is held by the workpiece holding jig and the portion including at least the code forming surface is partially immersed in the cleaning liquid for cleaning,
A small amount of the cleaning liquid adheres to the work, and the cleaning liquid can be removed together with the remaining stains by wiping the code forming surface of the work with a wiping member such as felt later, and the drying can be simplified or omitted, and the process can be simplified and shortened.

According to the laser marking apparatus of the second aspect of the present invention, the work holding jig is conveyed between the respective parts by the conveyor, and the work is held and fitted on the work holding jig by the transfer robot in the work loading part. The marking part irradiates the work holding jig with a laser beam to form a code, and the reversing part reverses the work holding jig so that the work is located on the lower side and the cleaning part cleans the work code forming surface. The code forming surface is wiped in a state in which the work is fitted in the work holding jig in the wiping unit by partially immersing the cleaning liquid in the cleaning liquid, so that the manufacturing process can be automated in addition to the action of the above-mentioned claim 1. , The work man-hour can be reduced.

According to the laser marking apparatus of the second aspect of the present invention, after the work is fitted and held in the work holding jig, the work holding member is lifted by the hammering portion and pressed against the holding member, so that the work is held. The work holding member can be securely fitted to the work holding portion in a proper posture, the work can be prevented from falling off, and the subsequent code formation can be performed with high accuracy and without causing defects.

According to the laser marking method or the laser marking apparatus of the present invention, the inner surface of the work is fitted and held in the work holding portion (recess) of the work holding jig. The outer surface of the product is not scratched and the appearance of the product can be prevented from being defective.
According to the laser marking device of the fifth aspect of the present invention, after removing the work having the code formed in the payout part from the work holding jig, the work holding jig is returned to the starting end of the conveyor by the returning conveyor. Since it is transferred to, the automation can be further promoted and the man-hour can be further reduced.

According to the exhaust hood for a laser beam irradiator of the sixth aspect of the invention, a negative pressure source such as a vacuum pump is defined between the outer shell member and the inner shell member by defining a duct space opened on the work side. Therefore, smoke and the like generated by irradiating the work with laser light can be sucked and discharged efficiently with a simple structure, power consumption can be reduced, and cost can be reduced.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 23 show a laser marking apparatus according to an embodiment of the present invention. FIG. 1 is a schematic plan view of the whole, FIG. 2 is a rear view of a main part of a jig receiving station, and FIG. 3 is a work loading station. 4 is a front view of the transfer robot of the work loading station, FIG. 5 is a side view of the transfer robot, FIG. 6 is an overall schematic perspective view of the work loading station, and FIG. Side view of the station, Figure 8 is a plan view of the marking station,
FIG. 9 is a front view of the marking station, FIG. 10 is a front view of a main part of the laser beam irradiation machine of the marking station, FIG. 11 is a schematic enlarged front view of a part of the laser beam irradiation machine, and FIGS. 13A and 13B are diagrams schematically showing the formation of a code by the same laser beam irradiator, FIGS. 13A and 13B are diagrams schematically showing another mode of forming the same symbol, and FIG. 14 is an exhaust hood used in the same laser beam irradiator. Of FIG. 15, FIG. 15 is a plan view of the exhaust hood, FIG. 16 is a front sectional view of the exhaust hood, and FIGS. 17a and 17b are drawings showing exhaust hoods of other aspects. 20 is a perspective view of an essential part of the reversing station, FIG. 21 is a side view of an essential part of the cleaning station, FIG. 22 is a side view of an essential part of the wiping station, and FIG. 23 is a view showing a work holding jig.

In FIG. 1, C indicates a transfer line, and the transfer line C includes a jig receiving station S0, a work loading station S1, a tapping station S2, a marking station S3, a reversing station S4, a cleaning station S5, a wiping station S6 and The payout stations S7 are sequentially set in the carrying direction. The carrying line C is configured by arranging a line conveyor Ca and a belt conveyor (returning conveyor) Cb in parallel vertically.
From a plurality of divided conveyors where the line conveyor Ca is divided between stations (hereinafter the same as the line conveyor Ca), the belt conveyor Cb holds the work on the traveling belt, as shown in the figure described later. It is composed of a well-known one for mounting and carrying the jig 20.

The line conveyor Ca described above, that is, the division conveyor Ca, is provided with a pair of pulleys g spaced apart in the carrying direction on both sides of the conveyor frame h, as will be described later with reference to FIG. A thin belt f is hung on each pair of pulleys g. In this divided conveyor Ca, two thin belts f are positioned in parallel with each other with an interval equal to the width dimension of the work holding jig 20, and the work holding jig 20 is placed on these two thin belts f.
Place both side edges of and transport.

Further, the work holding jig 20 is shown in FIG.
As shown in b and c, it is made of a flat plate of aluminum (alloy) or the like, and a total of eight positioning notches 21 and 21 each of two large and small are formed on a pair of opposing side portions. Further, in this work holding jig 20, eight rows of elongated holes 22 are formed in parallel to penetrate the front and back sides, and each elongated hole 2 is formed on one surface (front surface).
2 work holding parts 23, 4 each along 2
Is formed so that the resin molded product (work) 1 described above can be fitted and held.

As shown in detail in FIGS. 23b and 23c, the work holding portion 23 is composed of a pair of concave portions 24, 24 having a substantially U shape in plan view, into which the open end portion of the resin molded product 1 can be fitted. The recesses 24, 24 are formed so that the inner sides of the bends face each other and stride over the elongated hole 22. These work holding parts 23 are provided with recesses 24, 24.
Between the inner wall surfaces of the resin molded product 1 (see Fig. 23c) is
Is slightly larger than the dimension α '(see FIG. 23c) between the inner wall surfaces of the opening end of the resin molded article 1 and the dimension β'between the outer wall surfaces of the recesses 24, 24 is larger than the dimension β'between the outer wall surface of the opening end of the resin molded product 1. Also, the inner end is fitted in a state where the open end of the resin molded product 1 loosely fits the outer part. Further, in the work holding portion 23, C (R) chamfering is applied to the opening edge portion of each recess 24 over the entire circumference.

In this embodiment, as the work, the above-mentioned bottomed tubular resin molded product 1 shown in FIG. It goes without saying that the invention can be applied to works of various shapes. Further, the chamfering of the opening edge portion of the recess 24 is formed over the entire circumference for convenience of processing, but it is also sufficient to form the chamfering only on the inner side portion of the opening edge portion of the recess 24, that is, only on the fitting side. Further, the above-mentioned work holding portion 23 can be replaced by a projection formed integrally, or a shaft-shaped member separately provided by bolts, adhesion, welding or the like.

Next, the laser marking device will be explained. The jig receiving station S0 is located at the start end of the carrying line C (the lower side of the paper in FIG. 1), and the work holding jig 20 is moved from the belt conveyor Cb to the line conveyor Ca. A transfer mechanism 40 for lifting and transferring is provided. Transfer mechanism 40
As shown in FIG. 2, a support member 41 is provided on the floor so that its height can be adjusted by a plurality of legs 42, and a support post 43 is erected on one side of this support member 41. A lifting motor 50 is mounted. A bracket 44 is horizontally extended at the upper end of the support post 43, and a screw shaft 45 is rotatably supported between the bracket 44 and the support member 41.

The screw shaft 45 has a lower end protruding below the support member 41, and a pulley 46 is fixedly mounted on the protruding lower end.
Further, a screw is formed in the intermediate portion, and the nut member 47 is screwed into this screw. The screw shaft 45 is rotated by being driven by the motor 50, with the timing belt 52 being looped between the pulley 46 and the pulley 51 fixed to the rotary shaft of the lifting / lowering motor 50. The lifting frame 48 is horizontally fixed to the side surface of the nut member 47, and the nut member 47 moves up and down integrally with the lifting frame 48 by the rotation of the screw shaft 45.

A pair of pulleys 49 are rotatably attached to both sides of the upper portion of the elevating frame 48, and a transfer motor 53 is mounted on the lower portion thereof, and the pulley 54 provided on the rotating shaft of the motor 53 and the above-described pulley 54. A thin belt f is hung between the pair of pulleys 49. Incidentally, 56 is the pulley 4
A slidable member having a thin belt f slidably provided on the upper surface between 9 and 57 is a guide pulley rotatably arranged on both sides of the pulley 54 of the motor 53.

The transfer mechanism 40 receives the empty work holding jig 20 returned by the belt conveyor Cb on the thin belt f in a state where the elevating frame 48 stands by at the lowered position (state of FIG. 2). Then, after this, the lifting frame 48
Is driven by the motor 50 to move up and move to the up position (see FIG.
The thin belt f is made to travel by the motor 53 at the middle and two-dot chain line position) and is transferred to the line conveyor Ca.

At the work loading station S1, a positioning mechanism 150 for the work holding jig 20 and a work transfer robot 110 are arranged.
The work supply conveyor 130 extends toward 0 in a direction orthogonal to the line conveyor Ca. Positioning mechanism 15
As shown in FIG. 3, 0 means that the stopper pieces 151 having a length substantially equal to the width of the thin belt f are fixed on both upper sides of the conveyor frame h so as to face the thin belt f in the vertical direction, and Lifting cylinder 15 on the base member 152
3 is provided, and a substantially plate-shaped push-up member 154 is attached to the tip of the operating rod of the elevating cylinder 153 with a screw or the like.

The push-up member 154 is provided with a pin projecting / withdrawing cylinder 155 on the lower surface thereof, and a plurality of guide rods 156 are vertically provided on the peripheral portion of the lower surface. Cylinder for projecting and retracting pins 1
55, a positioning pin 157 which is engageable with the positioning notch 21 of the work holding jig 20 is provided at the tip of the operating rod, and the positioning pin 157 is projected and retracted onto the push-up member 154. The guide rod 156 is a guide bush 159 provided on the base member 152 via a spacer 158.
It is slidably inserted into and guides the up-and-down movement of the push-up member 154. Incidentally, 160 is a lock pin.

As shown in FIGS. 3 and 5, the work supply conveyor 130 is provided with a plurality of guide members 132 extending in the traveling direction in parallel on the belt conveyor 131, and
A stopper member 133 extending in a direction orthogonal to the traveling direction is provided at the front end in the traveling direction (end on the line conveyor Ca side). The work supply conveyor 130 is mounted on the belt surface of the belt conveyor 131 by the guide member 132.
The striped alignment paths are defined, and the resin molded products 1 are aligned and conveyed in a row on each of the aligned paths, and the resin molded products 1 on each of the aligned paths come into contact with the stopper member 132 and stop. In FIG. 5, reference numeral 134 denotes an air blow tube, 135
Is a pressing plate that blows compressed air from the air blowing tube 134 to prevent the resin molded product 1 from sticking, and the pressing plate 135 prevents the resin molded product 1 from jumping out when air is blown from the air tube 134.

The work transfer robot 110 is shown in FIGS.
As shown in FIG. 6, it is composed of an XYZθ robot and has a vacuum hand 111 that is movable in three-dimensional directions. The vacuum hand 111 is configured by attaching eight suction elements 111a corresponding to the number of the alignment paths (the number of the work holding portions 23 of the work holding jig 20 in the vertical direction) to a substantially belt-shaped holding member 112. The child 111a is connected to a negative pressure source (not shown). The workpiece transfer robot 110 vacuum-sucks the resin molded product 1 that is in contact with the stopper member 133 of each alignment path by the suction element 111a of the robot hand 111, and fixes the workpiece of the workpiece holding jig 20 by the positioning mechanism. It is transferred to the holding unit 23. Note that the work transfer robot 110 can also be composed of an XYZ robot, and its type (specification) is the work supply conveyor 13.
0 or the positional relationship between the work holding jig 20 and the like are appropriately selected.

In the work loading station S1, when the work holding jig 20 conveyed from the jig receiving station S0 reaches a predetermined position, the positioning mechanism 1
The work holding jig 20 is fixed at a predetermined position by 50,
The work transfer robot 110 sucks and transfers the resin molded product 1 on the work supply conveyor 130 to the work holding portion 23 of the work holding jig 20 fixed at this predetermined position. That is, the positioning mechanism 150 raises the push-up member 154 by the elevating cylinder 153 to bring the work holding jig 20 into contact with the stopper piece 151, and causes the pin projecting and retracting cylinder 155 to project the positioning pin 157 to hold the work. The work holding jig 2 is engaged with the notch 21 of the jig 20.
Fix 0 at the specified position.

Further, in the work supply conveyor 130, the resin molded products 1 are supplied to the respective alignment paths in an aligned state, and the resin molded products 1 in the front row of these alignment paths are stopper members 13.
It abuts on 2 and is located in a straight line. Then, the work transfer robot 110 moves the vacuum hand 111 in the XYZ directions, and the suction members 111 a of the holding member 112 cause the stopper members 13 of the alignment paths of the work supply conveyor 130.
The resin molded products 1 that are in contact with 2 are collectively adsorbed and taken out, and loaded into the one-row work holding portions 23 of the work holding jig 20. After that, this operation is repeated to repeat the work holding member 2
When the loading of the resin molded product 1 into all the work holding portions 23 of 0 is completed, the positioning mechanism 150 performs the operation reverse to the above operation to open the work holding jig 20, and the work holding jig is operated by the division conveyor Ca. 20 is transferred to the next tapping station S2.

At the tapping station S2, as shown in FIG. 7, a pressing member 210 is provided above the division conveyor Ca.
However, the pressing mechanism 220 is provided below the division conveyor Ca. The pressing member 210 is made of a plate-shaped member having a rubber sheet 211 adhered to the lower surface thereof, and is laid across support conveyors 212 erected on both sides of the division conveyor Ca across the division conveyor Ca. As will be described later in detail, the resin molded product 1 which is lifted from the division conveyor Ca by the pressing mechanism 220 and mounted on the work holding jig 20 is pressed against the pressing member 210. Reference numeral 213 is a guide plate attached to the middle portion of each support rod 212 by a bracket 214.
Reference numeral 3 prevents the work holding jig 20 from falling off from the thin belt f of the divided conveyor Ca.

The pressing mechanism 220 is a plate-shaped pressing member 22 that is supported above the pedestal 221 so as to be able to move up and down between the thin belts f.
2 and an elevating cylinder 223 that elevates and lowers the pressing member 222. The gantry 221 has a plurality of members 22.
The upper member 221 is configured by connecting 1a by welding or the like.
A bush 224 for the guide rod is provided in the peripheral portion of a, and a bush 2 for the cylinder rod is provided in the central portion of the upper member 221a.
25 is fixed. A plurality of guide rods 226 that slidably penetrate the bush 224 around the lower surface are fixed to the pressing member 222 by bolts or the like, and a substantially cylindrical case member 229 is fixed to the center of the lower surface by bolts or the like, and a predetermined lower surface is formed. A positioning cylinder 227 is attached to the position. The positioning cylinder 227 includes a positioning pin 228 that slidably penetrates the pressing member 222 at the tip of the operating rod.
Is fixed, and the positioning pin 228 is pressed against the pressing member 222.
Drive it so that it sinks upward.

The lifting cylinder 223 is fixed on the lower member 221a in the pedestal 221 and its operating rod 22
3a slidably penetrates the bush 225 and slidably projects into the case member 229. A case member 229 is attached to the tip of the operating rod 223a of the lifting cylinder 223.
A disk-shaped retainer 230 that can be locked to the inner wall opening edge portion of is fixed by a bolt 231 and a spring 232 is compressed between the retainer 230 and the lower surface of the pressing member 222. Note that 233 is a stopper that defines the lower limit position of the pressing member 222.

In the tapping station S2, when the work holding jig 20 reaches a predetermined position, the pressing mechanism 220 causes the positioning cylinder 227 to cause the positioning pin 228 to project to the positioning notch 21 of the work holding jig 20. Engagement and lifting cylinder 22
3 extends to move the pressing member 222 upward, and the pressing member 222 presses the resin molded product 1 of the work holding jig 20 against the rubber sheet 211 on the lower surface of the pressing member 210 to fit the resin molded product 1 to the work holding portion 23. To wear. And at this time,
The spring 232 prevents the pressing force from becoming excessive.

The marking station S3 is shown in FIG.
As shown in FIGS. 9 and 10, a laser light irradiator 300 having a table (robot hand) 310 capable of three-dimensional position (XYZ) control is arranged, and a division conveyor Ca is mounted on the table 310. As shown in FIG. 10, in the divided conveyor Ca, a plate-shaped base member 311 is fixed on the upper surface of the table 310, and the support member 3 is mounted on the base member 311.
Two substantially strip-shaped sliding members 312 are horizontally and parallelly provided at a predetermined interval at 19, and the drive unit 320 is fixed to the upper surface of the base member 311 between the supporting members 319.

The drive unit 320 is a well-known drive unit that houses a motor and a speed reducer, and its drive shaft 322 projects to both sides of the support member 319, and the drive pulley 32 is provided at each end.
3 is fixed. The sliding member 312 has pulleys 313 whose peripheral surfaces are substantially aligned with the upper surface of the sliding member 312 at both ends.
Is rotatably provided, and a thin belt f is hung on guide pulleys 324 provided on both side surfaces of the pulley 313, the drive pulley 323, and the support member 319. As described above, this divisional conveyor Ca transfers the holding jig 20 by mounting the peripheral portion of the work holding jig 20 on the thin belt f.

Further, on the base member 311, a stopper cylinder 331 is fixedly installed on one side in the direction of conveyance of the divided conveyor Ca and a positioning cylinder 332 is fixedly installed on the other side. The stopper cylinder 331 has a stopper pin 3 at the tip of the operating rod.
31 a is formed, and the stopper pin 331 a is projected and retracted above the thin belt f, that is, so as to engage with one end of the work holding jig 20 conveyed by the thin belt f. Similarly, in the positioning cylinder 332, a positioning pin 332a is fixedly provided at the tip of the operating rod, and the positioning pin 332a is projected and retracted above the thin belt f so that the positioning pin 332a can engage with the other end of the work holding jig 20. . The cylinders 331 and 332 and the pins 331a and 332a form a positioning mechanism 330.

The laser light irradiator 300 is shown in FIG.
As shown in FIGS. 11 and 12, a laser light emitter 353 is provided at the tip of an arm 352 that extends horizontally from the upper part of the device base body 351, and this laser light emitter 353 and the above-mentioned division conveyor Ca on the table 310 are provided. An exhaust hood 360 is provided between Although detailed description is omitted, the laser light emitter 353 includes a well-known laser light emitter that emits laser light, a lens 354, and a mask 355 for forming a code. The mask 355 is a code (A in this embodiment).
Pattern) corresponding to (characters of
Reference numeral 4 focuses the laser light on the resin molded product 1 to form a code image.

In this laser light irradiator 300, as shown in FIG. 13, a mask 355 is fixed and attached,
The laser light-emitting element is scanned in the XY directions to sequentially irradiate the divided areas of the mask 355 (four areas divided into four in this embodiment), and a part of the code is formed by the irradiation on the first floor. It is also possible to form the entire code A by irradiation.

The exhaust hood 360 is shown in FIGS.
As shown in FIG. 5, it has a hollow pipe shape constituted by assembling the inner shell member 362 in the outer shell member 361, and the lower end thereof is arranged close to the resin molded product 1 of the work holding jig 20 described above. The outer shell member 361 is made of a tubular member with both ends open, has a taper portion 361a with a reduced diameter at the lower end, and a joint pipe 363 is fixed or integrally formed on the outer circumference. The inner shell member 362 has a tapered pipe shape with both ends open, and the outer diameter of the outer shell member 3 is set so that the opening end on the diameter reduction side is located below.
It is provided in 61. In this inner shell member 362, the upper end on the large diameter side is substantially airtightly engaged with the inner surface of the outer shell member 361, and the lower end on the small diameter side forms a gap 3 with the inner surface of the tapered portion 361.
64a is formed.

A duct space 364 extending in an annular cross section is defined between the inner surface of the outer shell member 361 and the outer surface of the inner shell member 362, and the lower end of the duct space 364 is the gap 36.
It is opened downward from 4a. Fitting pipe 363
Is opened to the duct space 364, and the other end is connected to a negative pressure source such as a vacuum pump (not shown). This exhaust hood 360
Laser light passes through the inner shell member 362, and smoke generated during code formation by the laser light is sucked into the duct space 364 through the gap 364a and discharged through the joint pipe 363 as shown by the arrow in FIGS.

The exhaust hood 360 described above is shown in FIG.
7a, b, as shown in FIG. 18,
Alternatively, the one shown in FIG. 19 can be used. That is, the exhaust hood 360 shown in FIGS.
Is a rectangular pipe-shaped outer shell member 371 having a tapered portion 371a at the lower end, and a quadrangular truncated pyramid pipe-shaped inner shell member 37.
2 is assembled so that the upper end thereof coincides with the upper end of the outer shell member 371, and a duct space 374 is defined between the outer surface of the inner shell member 372 and the inner surface of the outer shell member 371. A gap 374a is formed between the lower end of the inner shell member 372 and the inner surface of the tapered portion 371a of the outer shell member 371 and opens into the duct space 374,
The duct space 374 is connected to a vacuum pump or the like via a joint pipe 373.

The exhaust hood 360 shown in FIG.
The tapered inner shell member 382 was assembled from the upper opening thereof into the substantially tubular outer shell member 381, and the intermediate portion of the outer peripheral surface of the inner shell member 382 was fitted in the upper opening of the outer shell member 381 in a substantially airtight manner. It is a thing. Furthermore, in the exhaust hood 360 shown in FIG. 19, the outer shell member 391 and the inner shell member 392 are formed in a substantially similar shape, and the outer shell member 391 and the inner shell member 392 are formed.
And the upper end openings are aligned with each other, and they are assembled by adhesion, welding, or bolts. In addition, as shown in FIG.
Regarding the exhaust hoods 18 and 19, the description of the same parts as the exhaust hood of FIG. 14 is omitted.

At the reversing station S4, as shown in FIG. 20, a reversing mechanism 400 is provided between the division conveyors Ca. The reversing mechanism 400 fixes the receiving member 401 of the work holding jig 20 to the support shaft 402, and the support shaft 402
Is laid on a conveyor frame or the like (not shown) so as to be rotatable in a direction orthogonal to the conveying direction. Receiving member 401
Is substantially U-shaped when viewed from the side and has a receiving groove 401a capable of accommodating the work holding jig 20 in which the resin molded product 1 is mounted, and is fixed to the support shaft 403 by the bracket 402 at two closed ends. To be done. The support shaft 403 is a bracket 40.
A pulley 404 is fixed between the two, and a timing belt 407 is looped between the pulley 404 and the pulley 406 of the drive unit 405.

The drive unit 405 includes a rotary actuator and rotationally drives the support shaft 403, that is,
This reversing mechanism 400 for swinging the receiving member 401
Stands by at the position where the receiving groove 401a of the receiving member 401 opens toward the pre-stage division conveyor Ca, and
01, the work holding jig 20 is received with the resin molded product 1 mounted on the upper side, and when the work holding member 20 is received as shown by the arrow in the figure, the support shaft 403 rotates about 180 ° and the receiving member 401 When the workpiece holding member 20 in the receiving groove 401a is inverted at a position where the receiving groove 401a is opened toward the divided conveyor Ca in the subsequent stage, that is, the resin molded product 1 is attached to the lower side, the workpiece holding member 20 is delivered.

At the cleaning station S5, as shown in FIG. 21, a cleaning tank 501 storing a cleaning liquid is arranged, and in the cleaning tank 501, a feeding mechanism 510 and a cleaning tank 5 are provided.
A transfer mechanism 530 is provided at each of the inlet and the outlet of 01. The cleaning tank 501 is of a well-known ultrasonic cleaning type, and stores cleaning liquid up to a predetermined liquid level L. The feeding mechanism 510 is provided with sliders 513 slidably in the vertical direction on guide poles 512 standing on both sides of the entrance and exit of the cleaning tank 501 (direction orthogonal to the conveying direction of the work holding jig). The guide members 511 are attached to the respective sliders 513 along the carrying direction, and the operating rods of the elevating cylinders 515 fixed to the upper ends of the guide poles 512 are connected to the guide members 511.

The guide member 511 has a substantially L-shaped cross section having a strip-shaped vertical portion 511a extending vertically in the transfer direction and a strip-shaped horizontal portion 511b extending horizontally from the lower end of the vertical portion 511a. Cleaning tank 501 consisting of long members
It has a longitudinal dimension that allows it to be immersed therein. The pair of guide members 511 are arranged so that the horizontal portions 511b face each other, and both side edges of the work holding jig 20 are slidably engaged with the horizontal portions 511b. The elevating cylinder 515 is arranged with the operating rod facing downward, and the tip of the operating rod is connected to the guide member 511 by the bracket 516. The lifting cylinder 515 moves the guide member 511 up and down,
When the guide member 511 is in the lowered position, the resin molded product 1 held on the lower side of the work holding member 20 placed on the horizontal portion 511b partially has only the lower surface portion (the surface on which the reference numeral is formed) of the cleaning liquid in the cleaning tank 501. It is immersed inside (see the phantom line in FIG. 21).

In the transfer mechanism 530, guide rails 532 are provided in parallel on both sides of the cleaning tank 501 by poles 531 and a cross member 534 is installed on a slider 533 slidably engaged with these guide rails 532. The cross member 534 includes a pair of lifting rods 535 and a lifting cylinder 536. The cross member 534 is connected to a slide cylinder 537 at its end, and is driven by the slide cylinder 537 to reciprocate in a predetermined range in the transport direction.

The lifting rod 535 has a coupling member 53 at its upper end.
9 are connected to each other and slidably penetrate through a bush 538 provided on the cross member 534 and hang down.
The elevating cylinder 536 is fixed upward on the cross member 534 between the elevating rods 535, and the tip of the operating rod is connected to the coupling member 539 to integrally elevate the elevating rod 535. The transfer mechanism 530 has substantially the same configuration on the inlet side and the outlet side, and is therefore represented by the above description.

In this cleaning station S5, the guide member 511 is in the raised position, and the transfer mechanism 530 positions the cross member 534 on the reversing station S4 side to raise the elevating rod 535 and waits. The work holding jig 20 is the reversing station S
4 is moved, the elevating rod 535 is lowered, the lower end of the elevating rod 535 is brought into contact with the rear end of the work holding jig 20, and the cross member 534 is moved to the wiping station S6 side. Then, it is pushed out and transferred onto the horizontal portion 511b of the guide member 511. When the work holding jig 20 is completely placed on the horizontal portion 511b of the guide member 511, the guide member 511 descends and the resin molded product 1 held by the work holding jig 20.
Part of only the mark forming surface (around it) of the cleaning tank 50
Immerse in the cleaning liquid of 1.

Next, the cross member 534 is driven by the slide cylinder 537 to be transferred to the outlet side, and the mark forming surface of the resin molded product 1 held by the work holding jig 20 is ultrasonically cleaned during this transfer period. . When the work holding jig 20 reaches a predetermined position (cleaning end position) on the outlet side in the cleaning tank 501, the guide member 511 is driven by the elevating cylinder 515 to move up to a predetermined position (discharging position). After that, the cross member 534 further moves to the wiping station S6 side to move up and down the rod 535.
Then, the work holding jig 20 is pushed out and the work holding jig 20 is transferred to the dividing conveyor Ca.

The wiping station S6 has a restraint mechanism 61.
0 and the wiping mechanism 650 are arranged vertically. As shown in FIG. 22, the restraint mechanism 610 has a support member (not shown) that is laterally stretched by columns or the like, and a substantially rectangular plate-shaped lift member 611 is supported by this support member so that it can be lifted and lowered.
The supporting member is provided with an elevating cylinder 612 at the center and guide bushes 613 at the four corners. Lifting member 611
Has a substantially cylindrical case member 614 fixed to the center of the upper surface thereof with bolts or the like, and the guide bush 6 is provided at four corners of the peripheral portion of the upper surface.
A guide rod 615 that slidably passes through 13 is provided upright, and a pin protruding / withdrawing cylinder 616 is provided on one side of the upper surface.
Guide bushes 621 are provided on both sides of the pin projecting / withdrawing cylinder 616 in the direction perpendicular to the paper surface of FIG. 22, and a plurality of contact claws 617 are fixed to one side edge.

Similar to the pressing mechanism 220 of the tapping station S2 described above, the tip of the actuating rod 612a of the elevating cylinder 612 projects into the case member 614, and the retainer 618 at the end of this actuating rod and the upper surface of the elevating member 611. The spring 619 is contracted. A stopper pin 620 is slidably passed through each of the guide bushes 621, and an upper end of each stopper pin 620 is coupled by a coupling member 622 so that the upper end can be integrally lifted. The pin projecting / retracting cylinder 616 is arranged such that the tip of the operating rod faces upward, and the tip of the operating rod is connected to the coupling member 622, so that the stopper pin 620 projects into and out of the lower surface of the elevating member 611. The contact claw 617 has a tapered surface on the stopper pin 620 side, and the work holding jig 20 is sandwiched between the contact claw 617 and the contact claw 617 in a protruding state.
0 is constrained horizontally.

The wiping mechanism 650 has an X-direction moving member 65.
1, a Y-direction moving member 652 and a Z-direction moving member 653, and a wiping member 654 such as felt or cloth is provided on the upper surface of the Z-direction moving member 653. X-direction moving member 651
Has two pairs of shoes 651a on the lower surface and two guide rails 65 extending on the upper surface in parallel to the direction orthogonal to the transport direction.
8 is fixed, a Y direction drive cylinder 662 is provided on one side of the upper surface, and an X direction drive cylinder 656 is connected to one side edge via a floating joint 655. The shoe 651a slidably rides on a guide rail 657 extending in the carrying direction on the base member 699,
The direction driving cylinder 656 is installed on the base member 651, and the X direction moving member 651 is driven by the X direction driving cylinder 656 to move in the transport direction. The base member 699 is provided directly on the floor surface of the factory or via an elevating mechanism.

The Y-direction moving member 652 is provided with two pairs of shoes 652a on the lower surface, a plurality of guide bushes 659 and an elevating cylinder 660 on the upper surface, and a floating joint (not shown) at one side edge. The Y-direction drive cylinder 662 is connected. This Y-direction moving member 6
In the shoe 52, the shoe 652 a slidably rides on the guide rail 658 of the X-direction moving member 651, and is driven by the Y-direction drive cylinder 662 to move on the X-direction moving member 651 in the direction orthogonal to the transport direction.

The Z-direction moving member 653 has a plurality of guide rods 663 whose ends are fixed to the peripheral portion of the lower surface by bolts and the operating rod of the elevating cylinder 660 is connected to the central portion of the lower surface by bolts. The Z-direction moving member 653 is driven by the elevating cylinder 660 to move up and down on the Y-direction moving member 652, and the wiped member 654 on the upper surface is restrained by the restraining mechanism 610 in a raised state. 1 is contacted with a predetermined pressure.

In this wiping station S6, the work holding jig 20 conveyed by the division conveyor Ca is restrained by the restraining mechanism 610, and in this state, the code forming surface of the resin molded product 1 is wiped by the wiping mechanism 650. Remove cleaning liquid and clean dirt. That is, as described above, the restraining mechanism 610 lowers the elevating member 611 to sandwich the work holding jig 20 between the contact claw 617 and the stopper pin 620, and the wiping mechanism 650 uses the Z-direction moving member. 653 is raised to bring the wiping member 654 into contact with the code forming surface of the resin molded product 1 held by the work holding jig 20, and the moving members 65 are moved by the cylinders 656 and 662.
1,652, that is, the wiping member 654 is horizontal (XY)
In the direction, the code forming surface of the resin molded product 1 is wiped.

At the payout station S7, the operator takes out the work holding jig 20 from the line conveyor Ca and removes the resin molded product 1 held by the work holding jig 20. Then, the removed resin molded product 1 is accommodated in another accommodation jig or the like and conveyed to the next step, and the work holding jig 20 from which the resin molded product 1 is removed is conveyed to the belt conveyor Cb.
It is placed on the belt of No. 1 and is returned to the start end of the line conveyor Ca, that is, the jig receiving station S0.

At the payout station S7, the resin molded product 1 can be removed from the work holding jig 20 by using an automatic machine such as a robot. It is also possible to provide a dryer after the wiping station S6 described above to dry the cleaning liquid attached to the resin molded product 1.

Next, the overall operation of this embodiment will be described. First, in the jig receiving station S0, the empty work holding jig 20 returned by the belt conveyor Cb from the payout station S7 is held by the lifting mechanism 40 and the thin belt f of the line conveyor Ca. The work holding jig 20 is placed on the upper side and the next work loading station S1 is moved by the line conveyor Ca.
(See FIG. 2).

At the work loading station S1,
As shown in FIG. 3 to FIG. 6, the work holding jig 20 is fixed at a predetermined position by the positioning mechanism 150, and the resin molded product 1 on the work supply conveyor 130 is moved by the work transfer robot 110. It is transferred to the work holding unit 23. That is, the resin molded product 1 is vacuum-sucked to fit the open end of the resin molded product 1 into the recess 24 of the work holding jig 20, and the work molded jig 20 holds the resin molded product 1. Here, the resin molded product 1 fits into the concave portion 24 of the work holding jig 20 at the inside of the open end and fits the outside with a gap, so that the outer surface of the resin molded product 1 is prevented from being scratched.

After that, the resin molded product 1 is attached to the work holding portion 23.
The work holding jig 20 loaded in the
Is conveyed to the tapping station S2. Then, at the tapping station S2, as shown in FIGS. 6 and 7, the work holding jig 20 is pressed by the pressing mechanism 2
The resin molded product 1 is lifted by 10 and the resin molded product 1 is pressed by the pressing member 2.
It is pressed against 10 rubber sheets. Therefore, the resin molded product 1 can be reliably fitted to the work holding portion 23 of the work holding jig 20 in an appropriate posture. That is,
In the above-described work loading station S1, when the work transfer robot 110 vacuum-adsorbs the resin molded product, the resin molded product 1 cannot be securely fitted to the work holding portion 23, or the fitting posture is improper. However, such a defective loading can be corrected by pressing the resin molded product 1 against the work holding jig 20 at the tapping station S2, so that the defective marking or the like can be prevented from occurring at the next marking station S3.

Subsequently, the work holding jig 20 is conveyed to the marking station S3, and at the marking station S3, the upper surface (code forming surface) of the resin molded product 1 held by the work holding portion 23 of the work holding jig 20. Then, the laser beam irradiator 300 irradiates the laser beam through the mask 355 to form the symbol "A" on the upper surface of the resin molded product 1 (see FIGS. 8 to 19). That is, table 31
Workpiece holding jig 2 transferred to the divisional conveyor Ca on 0
0 is constrained to a specified position by the positioning mechanism 330, the position of the table 310 is controlled by XY, and the laser light irradiator 300 irradiates the upper surface of each resin molded product 1 with laser light.
A code is formed on the resin molded product 1.

Here, in forming this code, when the upper surface of the resin molded product 1 is irradiated with laser light, the outermost black coating layer 4 of the resin molded product 1 burns to generate smoke and soot. Laser light emitter 353 of the light irradiator 300
An exhaust hood 360 is provided between the resin molding 1 and the resin molded product 1, and smoke or the like is exhausted as indicated by arrows in FIGS. 15 and 16. Therefore, the lens 35 of the laser light emitter 353
Since 4 is not contaminated with smoke or soot, maintenance such as cleaning can be simplified, and the frequency of maintenance can be reduced.

The exhaust hood 360 is the outer shell member 3
In order to assemble the inner shell member 362 in 61 to define a duct space 364 communicating with a negative pressure source such as a vacuum pump, and to open the lower part of this duct space 364 to the upper surface of the resin molded product 1 through the gap 364a, As shown by the arrows in FIGS. 15 and 16, the generated smoke and the like can be effectively sucked in, and the smoke can be efficiently discharged without requiring a large amount of power, and the power consumption can be reduced and the cost can be reduced.

Next, the work holding jig 20 is conveyed to the reversing station S4, is reversed 180 degrees (the front and back are reversed) by the reversing mechanism 400 in the reversing station S4, and is conveyed to the cleaning station S5. That is, when the work holding jig 20 is inserted into the receiving groove 401 a of the receiving member 401, the reversing mechanism 400 rotates the receiving member 401 by about 180 ° by the drive unit 405, and the work holding jig 20 is resin-molded. The product 1 is transferred to the division conveyor Ca in a posture in which it is located on the lower side (reversed posture) and is conveyed to the cleaning station S5 (see FIG. 20).

At the cleaning station S5, FIG.
As shown in FIG. 5, the work holding jig 20 in the inverted position is transferred to the feeding mechanism 510 by the transfer mechanism 530, and the work holding jig 20 is moved only by the feeding mechanism 510 to the code forming surface (or the code forming surface) of the resin molded product 1. (Including a part) is moved in the cleaning tank 501 for cleaning while being immersed in the cleaning liquid, and is transferred to the next wiping station S6 by being transferred to the division conveyor Ca by the transfer mechanism 530 at the outlet of the cleaning tank 501 by the transfer mechanism 530. Here, at the time of this cleaning, since the entire resin molded product 1 or the work holding jig 20 is not immersed in the cleaning liquid, the cleaning liquid can be removed only by wiping thereafter.
Steps such as drying can be omitted or simplified to shorten the steps.

In the wiping station S6, the work holding jig 20 in the inverted posture is held by the holding mechanism 610, and the code forming surface of the resin molded product 1 of the work holding jig 20 is wiped by the wiping mechanism 650. That is, as shown in FIG. 22, the wiping mechanism 650 includes a wiping member 65 such as felt or cloth.
4 is brought into contact with the code forming surface of the resin molded product 1 with a predetermined (small) pressure to move (slide) in the XY directions, and the code forming surface of the resin molded product 1 is cleaned. Therefore, it is possible to remove dirt such as burned dust that is stubbornly stuck to the code forming surface of the resin molded product 1, and also to remove the cleaning liquid attached. In particular, since the amount of the cleaning liquid that adheres to the resin molded product 1 is small here as described above, the cleaning liquid can also be reliably removed.

[0070]

As described above, according to the laser marking method of the first aspect of the present invention, the work holding jig is positioned on the lower side after the work is irradiated with the laser beam to form the code. In this way, the work is held by the work holding jig and the part including at least the code forming surface is partially immersed in the cleaning liquid for cleaning. By wiping the code forming surface with a wiping member such as felt, the cleaning liquid can be removed together with the remaining stains, and the drying can be simplified or omitted, and the process can be simplified and shortened.

According to the laser marking device of the second aspect of the present invention, the work holding jig is conveyed between the respective parts by the conveyor, and the work is held and fitted in the work holding jig by the transfer robot in the work loading part. The marking part irradiates the work holding jig with a laser beam to form a code, and the reversing part reverses the work holding jig so that the work is located on the lower side and the cleaning part cleans the work code forming surface. In addition to the effect of claim 1, automation of the manufacturing process can be achieved because the code forming surface is wiped in a state in which the work is fitted in the work holding jig in the wiping unit by partially immersing in the cleaning liquid for cleaning. The work man-hour can be reduced, and furthermore, after the work is fitted and held on the work holding jig, the work holding member is lifted by the hammering part and pressed against the holding member, so that the work holding member is held. Can be reliably fitted in a proper position on the workpiece holding portion, falling or the like of the workpiece can be prevented,
In addition, subsequent code formation can be performed with high accuracy without causing defects.

According to the laser marking method or the laser marking apparatus of the present invention, the inner surface of the work is fitted and held in the work holding portion (recess) of the work holding jig. The outer surface of the product is not scratched and the appearance of the product can be prevented from being defective.
According to the laser marking device of the fifth aspect of the present invention, since the work holding jig is returned to the starting end of the conveyor by the returning conveyer after removing the work with the code formed in the payout part from the work holding jig. Automation can be promoted more and man-hours can be reduced.

According to the exhaust hood for a laser beam irradiator of the sixth aspect of the invention, a negative pressure source such as a vacuum pump is defined between the outer shell member and the inner shell member by defining a duct space opened on the work side. Therefore, smoke and the like generated by irradiating the work with laser light can be sucked and discharged efficiently with a simple structure, power consumption can be reduced, and cost can be reduced.

[Brief description of drawings]

FIG. 1 is an overall schematic plan view of a laser marking device according to an embodiment of the present invention.

FIG. 2 is a rear view of a main part of a jig receiving station of the laser marking device.

FIG. 3 is a side view of a main part of a work mounting station of the laser marking device.

FIG. 4 is a front view of a work transfer robot of the work mounting station.

FIG. 5 is a side view of the work transfer robot.

FIG. 6 is a schematic perspective view of the entire work loading station.

FIG. 7 is a side view of a main part of a tapping station of the laser marking device.

FIG. 8 is a plan view of a marking station of the laser marking device.

FIG. 9 is a front view of the marking station.

FIG. 10 is a rear view of the main part of the marking station.

FIG. 11 is a schematic front view of a main part of a laser light irradiator of the marking station.

FIG. 12 shows formation of a code in the marking station, a is a front view and b is a plan view of a work having the code formed.

13A and 13B are views showing another mode of forming a code in the marking station, wherein a is a front view and b is a plan view of a work on which the code is formed.

FIG. 14 is a perspective view of an exhaust hood used in the marking station.

FIG. 15 is a plan view of the exhaust hood.

FIG. 16 is a front sectional view of the exhaust hood.

FIG. 17 shows an exhaust hood of another aspect, in which a is a perspective view and b is a front sectional view.

FIG. 18 is a cross-sectional view of an exhaust hood of another mode.

FIG. 19 is a cross-sectional view showing an exhaust hood of still another aspect.

FIG. 20 is a perspective view of a main part of a reversing station of the laser marking device.

FIG. 21 is a side view of a main part of a cleaning station of the laser marking device.

FIG. 22 is a side view of a main part of a wiping station of the laser marking device.

FIG. 23 shows a work holding jig used in the laser marking apparatus, wherein a is an overall plan view, b is an enlarged plan view of a main part, and c is a sectional view of the main part.

FIG. 24 is a cross-sectional view of a resin molded product that is a target of code formation by the laser marking device.

FIG. 25 is a front view schematically showing a main part of a conventional laser marking device.

[Explanation of symbols]

1 Resin Molded Product (Work) 2 Resin Molded Member 3 White Paint Layer 4 Black Paint Layer 20 Work Holding Jig 21 Positioning Notch 23 Work Holding Part 24 Recess 40 Lifting Mechanism 110 Work Transfer Robot 130 Work Supply Conveyor 150 Positioning Mechanism 210 Pressing member 220 Pressing mechanism 300 Laser light irradiator 310 Table (robot hand) 330 Positioning mechanism 360 Exhaust hood 361 Outer shell member 362 Inner shell member 363 Joint pipe 364 Duct space 364a Gap 400 Inversion mechanism 501 Washing tank 510 Feeding mechanism 530 Transfer Loading mechanism 610 Restraint mechanism 650 Wiping mechanism 654 Wiping member C Conveyor Ca line conveyor, division conveyor Cb Belt conveyor (returning conveyor) S0 Jig receiving station S1 Work loading station (working station Loading unit) S2 hammering station (hammering unit) S3 marking station (marking portion) S4 inverting station (reversing portion) S5 wash station S6 wiping station (wiping portion) S7 payout station (supplying section)

Claims (6)

[Claims] 1. A plurality of works are aligned and held on a work holding jig with a marking processing surface facing upward, and the work holding jig is transferred to directly below a laser irradiator, and the laser irradiator marks the work. After irradiating the processing surface with a laser to form a code on the marking processing surface, the workpiece holding jig is inverted to direct the marking processing surface of the workpiece downward, and a part of the workpiece including the marking processing surface is A laser marking method, which comprises partially immersing in a cleaning liquid in a cleaning tank for cleaning, and then wiping the marking surface of the work. 2. A work holding jig capable of fitting and holding a plurality of works by aligning marking surfaces on a plurality of work holding portions respectively, and a conveyer for conveying the work holding jig, and the conveyor. The work holding jigs, which are installed in parallel with each other, are constrained to a specified position, and the works supplied in an aligned state are fitted to the work holding part of the work holding jig at the specified position by a transfer robot. A work loading unit and a work holding jig that has been loaded by the conveyor and is lifted from the work loading unit with the work above, and presses the work of the work holding jig laterally on the conveyor. The hammering portion to be pressed against the member and the workpiece holding jig loaded with the workpiece are conveyed from the hammering portion by the conveyor, and are placed on the upper surface of the workpiece of the workpiece holding jig. -Reversing the marking part that irradiates a laser beam from a light irradiator to form a code, and the work holding jig that has been loaded by the conveyor and conveyed by the conveyor from the marking part. The reversing part positioned on the lower side, and the work holding jig with the work loaded therein is conveyed from the reversing part by the conveyor, and a part of the work including at least the code forming surface is partially immersed in the cleaning liquid in the cleaning tank. And a cleaning unit for performing ultrasonic cleaning, and the work holding jig with the work loaded therein is conveyed from the cleaning unit by the conveyor with the work being positioned on the lower side, and the wiping member is moved to the work holding jig. A wiping portion that slides on the code forming surface of the work to wipe the code forming surface,
A laser marking device comprising: 3. The work holding jig is a plate-shaped member for holding a plurality of tubular works by fitting the open ends of the work, and the work holding jig is fitted on one surface into the open ends of the work. 3. The laser marking method according to claim 1, or the laser marking device according to claim 2, wherein a plurality of work holding portions for holding and fitting are aligned. 4. The work holding portion is a recess having a shape substantially similar to the open end of the work, and has a size such that an inner wall portion of the recess is fitted to an inner portion of the end of the work. The laser marking method or the laser marking apparatus according to claim 3, wherein the outer wall of the recess has a gap between the outer wall of the recess and the outer surface of the end of the work. 5. A discharging unit for removing the work whose code forming surface has been wiped by the wiping unit from the work holding jig, and a return for returning the work holding jig from the discharging unit toward the starting end side of the conveyor. 3. The laser marking device according to claim 2, further comprising: a conveyor for transfer and a transfer mechanism for transferring the work holding jig from the return conveyor to the conveyor. 6. An exhaust hood for a laser light irradiator, which is interposed between a laser light emitter and a work irradiated with the laser light from the laser light emitter, wherein the laser light can pass through the inside. The tubular inner shell member is assembled in the tubular outer shell member to define a duct space having the work side opening between the outer shell member and the inner shell member, and the duct space serves as a negative pressure source. Exhaust hood for laser light irradiation machine characterized by contacting us.