Laser joint device

Abstract

To provide a laser joint device which can inhibit a biasing force applied to a portion, to which a laser is radiated, of a workpiece from becoming excessively large or small.SOLUTION: A laser joint device 1 includes a laser radiation part 100, a front biasing member 200F, a rear biasing member 200R, a front sensor 400F, a rear sensor 400R, and an adjustment part 510. The adjustment part 510 adjusts a biasing force applied to a workpiece W by the front biasing member 200F and a biasing force applied to the workpiece W by the rear biasing member 200R so that the biasing force applied to the workpiece W by the front biasing member 200F and the biasing force applied to the workpiece W by the rear biasing member 200R are different from each other during radiation of the laser L by the laser radiation part 100.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a laser bonding apparatus. [Background technology]

[0002] For example, Japanese Patent Application Laid-Open Publication No. 2022-178726 discloses a dissimilar metal joining device for joining a first metal plate and a second metal plate made of different materials. This joining device includes a processing table, a mounting table that is relatively movable in the processing direction, a laser irradiation unit, a first pressing roller, and a second pressing roller. The pressure applied by the first pressing roller and the second pressing roller is feedback-controlled to achieve a desired pressure. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-178726 Summary of the Invention [Problem to be solved by the invention]

[0004] In a laser joining device such as that described in JP 2022-178726 A, the workpiece may soften or bend slightly due to heat input to the workpiece by the laser. If the workpiece softens, there is a concern that the pressure applied to the softened area by the pressure roller may become too large, while if the workpiece bends, there is a concern that the pressure applied to the workpiece may become too small due to a decrease in the adhesion of the workpiece.

[0005] An object of the present disclosure is to provide a laser joining device that can prevent the biasing force applied to the portion of the workpiece irradiated with the laser from becoming too large or too small. [Means for solving the problem]

[0006] a forward biasing member provided in front of the laser irradiation unit in the movement direction of the laser irradiation unit relative to the workpiece and biasing the workpiece; a rearward biasing member provided behind the laser irradiation unit in the movement direction and biasing the workpiece; a forward sensor capable of detecting the biasing force on the workpiece by the forward biasing member; a rearward sensor capable of detecting the biasing force on the workpiece by the rearward biasing member; and an adjustment unit that adjusts the biasing force on the workpiece by the front biasing member based on a detection value of the front sensor, and adjusts the biasing force on the workpiece by the rearward biasing member based on a detection value of the rear sensor, wherein the adjustment unit adjusts the biasing force on the workpiece by the front biasing member and the biasing force on the workpiece by the rearward biasing member so that the biasing force on the workpiece by the rearward biasing member and the biasing force on the workpiece by the front biasing member are different from each other during irradiation of the laser by the laser irradiation unit. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a laser joining device that can prevent the biasing force applied to the portion of the workpiece irradiated with the laser from becoming too large or too small. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a laser joining apparatus according to an embodiment of the present disclosure. FIG. [Figure 2] FIG. 2 is a cross-sectional view of the laser joining apparatus shown in FIG. [Figure 3] FIG. 10 is a perspective view of a front biasing member and a rear biasing member. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present disclosure will be described with reference to the accompanying drawings, in which the same or corresponding elements are designated by the same reference numerals.

[0010] Fig. 1 is a perspective view of a laser joining device according to an embodiment of the present disclosure. Fig. 2 is a cross-sectional view of the laser joining device shown in Fig. 1. Fig. 3 is a perspective view of a front biasing member and a rear biasing member. The laser joining device 1 of this embodiment is particularly suitable for joining resin members and metal members. However, the objects to be joined by the laser joining device 1 are not particularly limited.

[0011] 1, the laser joining apparatus 1 is capable of joining, for example, a workpiece W placed on a support table 10. The laser joining apparatus 1 is also capable of joining the workpiece W while it is held by an actuator (not shown) that is movable three-dimensionally. The laser joining apparatus 1 includes a laser irradiation unit 100, a holding member 150, a front biasing member 200F, a rear biasing member 200R, a front sensor 400F, a rear sensor 400R, and a control unit 500.

[0012] The laser irradiation unit 100 is capable of irradiating the workpiece W with a laser beam L. In this embodiment, the laser irradiation unit 100 irradiates the workpiece W with the laser beam L so that the irradiation direction of the laser beam L is perpendicular to the workpiece W. However, the irradiation direction of the laser beam L does not have to be perpendicular to the workpiece W.

[0013] The workpiece W may include a first workpiece and a second workpiece that are joined together. For example, a resin member may be used as the first workpiece, and a metal member may be used as the second workpiece. However, the workpieces are not limited to this. Furthermore, the workpiece W is not limited to being flat, and may be curved.

[0014] The holding member 150 is connected to the laser irradiation unit 100. The holding member 150 has a holding unit main body 151, a front attachment portion 152, and a rear attachment portion 153.

[0015] The holder body 151 surrounds the laser irradiation unit 100. The holder body 151 is formed in the shape of a square tube.

[0016] The front attachment portion 152 is provided at the front of the holder main body 151 in the movement direction of the laser irradiation portion 100. The front attachment portion 152 is a portion for attaching the front biasing member 200F.

[0017] The rear attachment portion 153 is provided at the rear of the holding portion main body 151 in the movement direction of the laser irradiation portion 100. The rear attachment portion 153 is a portion for attaching the rear biasing member 200R.

[0018] The front biasing member 200F is provided in front of the laser irradiation unit 100 in the movement direction of the laser irradiation unit 100 relative to the workpiece W. Specifically, the front biasing member 200F is connected to the front mounting portion 152. The front biasing member 200F is capable of applying a biasing force to the workpiece W.

[0019] The rear biasing member 200R is provided behind the laser irradiation unit 100 in the movement direction of the laser irradiation unit 100 relative to the workpiece W. Specifically, the rear biasing member 200R is connected to the rear attachment portion 153. The rear biasing member 200R is capable of applying a biasing force to the workpiece W.

[0020] In this embodiment, the front urging member 200F and the rear urging member 200R have substantially the same structure. Specifically, the rear urging member 200R has a structure symmetrical to the front urging member 200F with respect to a plane that is perpendicular to the movement direction of the laser irradiation unit 100 and passes through the irradiation point P (see FIG. 1) as a reference plane. Therefore, the following description will be given taking the front urging member 200F as an example.

[0021] The forward biasing member 200F has a biasing unit 210 (see FIG. 2), a support body 220, a rotary pressing body 230, a guide rail 240, at least one slider 250, a connecting plate 260, and a protective plate 270.

[0022] The urging unit 210 of the front urging member 200F is attached to the front mounting portion 152. The urging unit 210 is capable of adjusting the urging force applied to the workpiece W. In this embodiment, the urging unit 210 is configured with an air cylinder. However, the urging unit 210 is not limited to an air cylinder. As shown in FIG. 2 , the urging unit 210 has a cylinder 211, a piston 212, a rod 213, and a gas flow path 214. The urging unit 210 of the rear urging member 200R is attached to the rear mounting portion 153.

[0023] The rod 213 extends from the piston 212 toward the support 220. An end of the rod 213 (the lower end in the position shown in FIG. 2) is connected to the support 220.

[0024] Gas flow path 214 is connected to each space within cylinder 211 that is partitioned by piston 212. Gas (e.g., air) is supplied to cylinder 211 and gas is discharged from cylinder 211 through gas flow path 214. The tip of gas flow path 214 is connected to a pump or the like.

[0025] The support 220 is connected to an end of the biasing unit 210. The support 220 has a portion connected to the rod 213 and a portion that supports the rotary pressing body 230.

[0026] The rotary pressing body 230 is supported by the support body 220 so as to be rotatable relative to the support body 220. The rotary pressing body 230 presses the workpiece W while rotating relative to the workpiece W. In this embodiment, a roller made of metal is used as the rotary pressing body 230.

[0027] The guide rail 240 extends in the direction in which the biasing force is applied by the biasing unit 210 (a direction parallel to the direction of irradiation of the laser L from the laser irradiation unit 100). The guide rail 240 is disposed outside the cylinder 211 in a direction parallel to the movement direction of the laser irradiation unit 100. The guide rail 240 is fixed to the front mounting portion 152.

[0028] The slider 250 is held by the guide rail 240 so as to be movable along the guide rail 240. In this embodiment, two sliders 250 are held by the guide rail 240 at an interval from each other in the longitudinal direction of the guide rail 240. However, the number of sliders 250 is not limited to two.

[0029] The connecting plate 260 connects the support body 220 and the slider 250. Therefore, the connecting plate 260, the support body 220, and the rotary pressing body 230 are movable along the guide rail 240 together with the slider 250 relative to the laser irradiation unit 100. The connecting plate 260 also has the function of restricting the rotation of the support body 220 relative to the cylinder 211 around the central axis of the cylinder 211. Note that the connecting plate 260 of the forward biasing member 200F is omitted in FIG. 3.

[0030] As shown in FIGS. 1 and 3, the connecting plate 260 has a connecting portion 262 and a clamping portion 264.

[0031] The connecting portion 262 connects the outer surface of the support body 220 in a direction parallel to the movement direction of the laser irradiation unit 100 to the slider 250. The lower end of the connecting portion 262 is fixed to the support body 220 by a fastening member such as a screw. The upper end and middle portion of the connecting portion 262 are fixed to the slider 250 by a fastening member such as a screw. The connecting portion 262 is formed in a flat plate shape.

[0032] The clamping unit 264 clamps the support body 220 from both sides in an orthogonal direction that is orthogonal to both the movement direction of the laser irradiation unit 100 and the irradiation direction of the laser L. The clamping unit 264 is fixed to the outer surface of the support body 220 in the orthogonal direction by a fastening member such as a screw. The clamping unit 264 is connected to the connecting unit 262. Note that the clamping unit 264 may be omitted.

[0033] The protective plate 270 protects the cylinder 211 from the laser L. The protective plate 270 is disposed between the laser L emitted from the laser irradiation unit 100 and the cylinder 211, i.e., inside the cylinder 211 in a direction parallel to the movement direction of the laser irradiation unit 100. The protective plate 270 is fixed to the inner surface of the guide rail 240 in the direction parallel to the movement direction of the laser irradiation unit 100 by a fastening member such as a screw.

[0034] The front sensor 400F can detect the biasing force of the front biasing member 200F on the workpiece W. The front sensor 400F detects the biasing force of the front biasing member 200F on the workpiece W by detecting the position of the connecting plate 260. The front sensor 400F detects, for example, the position of the upper end of the connecting plate 260 of the front biasing member 200F.

[0035] The rear sensor 400R can detect the urging force of the rear urging member 200R on the workpiece W. The rear sensor 400R detects the urging force of the rear urging member 200R on the workpiece W by detecting the position of the connecting plate 260 of the rear urging member 200R. The rear sensor 400R detects, for example, the position of the upper end of the connecting plate 260 of the rear urging member 200R.

[0036] Examples of the front sensor 400F and the rear sensor 400R include a photoelectric sensor and a magnetic sensor. The front sensor 400F and the rear sensor 400R may be attached to the upper part of the guide rail 240 or the holding member 150, or may be fixed to a position spaced apart from the guide rail 240 or the holding member 150. For the sake of explanation, in FIG. 1, the front sensor 400F and the rear sensor 400R are shown at positions spaced apart from the respective biasing members 200F, 200R.

[0037] The control unit 500 controls the biasing force of the front biasing member 200F on the workpiece W and the biasing force of the rear biasing member 200R on the workpiece W. The control unit 500 has an adjustment unit 510, a memory unit 520, and an area identification unit 530.

[0038] The adjustment unit 510 adjusts the biasing force of the front biasing member 200F on the workpiece W based on the detection value of the front sensor 400F, and adjusts the biasing force of the rear biasing member 200R on the workpiece W based on the detection value of the rear sensor 400R. For example, the adjustment unit 510 adjusts the value of a pressure gauge connected to the gas flow path 214.

[0039] When the workpiece W is irradiated with the laser L, the workpiece W may be softened by the heat of the laser L. In particular, if the workpiece W includes a resin material, the portion of the resin material irradiated with the laser L or a portion nearby may be partially melted by the heat. In this case, the melted portion of the resin material is biased by the rear biasing member 200R. In other words, the biasing force of the rear biasing member 200R may become excessive.

[0040] On the other hand, when the workpiece W is irradiated with the laser L, the workpiece W may bend slightly due to the heat of the laser L, and the adhesion of the workpiece W may decrease. In this case, the part of the workpiece W where the adhesion has decreased is biased by the rear biasing member 200R. In other words, the biasing force of the rear biasing member 200R may become too small.

[0041] For this reason, in this embodiment, the adjustment unit 510 adjusts the biasing force of the workpiece W by the front biasing member 200F and the biasing force of the workpiece W by the rear biasing member 200R so that the biasing force of the workpiece W by the rear biasing member 200R and the biasing force of the workpiece W by the front biasing member 200F are different from each other during irradiation of the laser L by the laser irradiation unit 100. More preferably, the adjustment unit 510 adjusts the biasing force of the workpiece W by the front biasing member 200F and the biasing force of the workpiece W by the rear biasing member 200R so that the biasing force of the workpiece W by the rear biasing member 200R is smaller than the biasing force of the workpiece W by the front biasing member 200F during irradiation of the laser L by the laser irradiation unit 100. Hereinafter, this adjustment by the adjustment unit 510 will be referred to as the "front-rear adjustment operation." The biasing force of the front biasing member 200F on the workpiece W and the biasing force of the rear biasing member 200R on the workpiece W during irradiation with the laser L are appropriately set depending on the material, thickness, etc. of the workpiece W.

[0042] Furthermore, the adjustment unit 510 adjusts the biasing force of the rear biasing member 200R on the workpiece W so that the biasing force of the rear biasing member 200R on the workpiece W during irradiation of the laser L by the laser irradiation unit 100 is smaller than the biasing force of the rear biasing member 200R on the workpiece W at the start of irradiation of the laser L by the laser irradiation unit 100. Hereinafter, this adjustment by the adjustment unit 510 will be referred to as the "rear adjustment operation."

[0043] The storage unit 520 stores area-specific setting values, which are biasing forces preset for each of the different joining areas of the workpiece W. The area-specific setting values ​​are input from the outside. The storage unit 520 sends the area-specific setting values ​​to the adjustment unit 510. For example, the area-specific setting values ​​include a first front setting value, a first rear setting value, a second front setting value, and a second rear setting value.

[0044] The first front set value is the biasing force of the front biasing member 200F on the workpiece W in the first joining region. The first rear set value is the biasing force of the rear biasing member 200R on the workpiece W in the first joining region. The first front set value and the first rear set value may be different from each other.

[0045] The second front set value is the biasing force of the front biasing member 200F on the workpiece W in the second joining region. The second rear set value is the biasing force of the rear biasing member 200R on the workpiece W in the second joining region. The second front set value and the second rear set value may be different from each other. The second joining region may be adjacent to the first joining region or may be spaced apart from the first joining region.

[0046] The area identification unit 530 stores area information indicating each joining area. The area information is input from an external device. The area identification unit 530 sends the area information to the adjustment unit 510. Each joining area is set based on, for example, the material and thickness of the workpiece W.

[0047] The adjustment unit 510 adjusts the biasing forces on the workpiece W by the front biasing member 200F and the rear biasing member 200R based on the region information received from the region identification unit 530 and the region-specific setting values ​​received from the storage unit 520.

[0048] For example, when the adjustment unit 510 receives information indicating the first joining area from the area identification unit 530, it adjusts the value of the pressure gauge connected to the gas flow path 214 of the front urging member 200F so that the detection value of the front sensor 400F becomes the first front set value, and adjusts the value of the pressure gauge connected to the gas flow path 214 of the rear urging member 200R so that the detection value of the rear sensor 400R becomes the first rear set value.

[0049] Then, the adjustment unit 510 pre-adjusts the biasing forces of the front biasing member 200F and the rear biasing member 200R so that after the joining in the first joining area is completed and before the joining in the second joining area is started (before moving to the second joining area), the detection value of the front sensor 400F becomes the second front set value and the detection value of the rear sensor 400R becomes the second rear set value.

[0050] Thereafter, when the adjustment unit 510 receives information indicating the second joining area from the area identification unit 530, the adjustment unit 510 adjusts the value of the pressure gauge connected to the gas flow path 214 of the front urging member 200F so that the detection value of the front sensor 400F becomes the second front set value, and adjusts the value of the pressure gauge connected to the gas flow path 214 of the rear urging member 200R so that the detection value of the rear sensor 400R becomes the second rear set value.

[0051] Furthermore, the adjustment unit 510 performs the front-rear adjustment operation and the rear adjustment operation while any of the joining regions is being joined.

[0052] As described above, in the laser joining apparatus 1 of this embodiment, the biasing force of the rearward biasing member 200R is adjusted to be less than the biasing force of the forward biasing member 200F during irradiation of the laser L, so that even if the portion of the workpiece W irradiated with the laser L becomes softer than before irradiation of the laser L, poor joining caused by the biasing force of the rearward biasing member 200R applied to that portion becoming excessive is suppressed.

[0053] Furthermore, since the adjustment unit 510 performs rear adjustment operations, even when the workpiece W contains a resin material, i.e., when the resin material softens more after irradiation with the laser L than at the start of irradiation due to the resin material melting due to the heat of the laser L, it is possible to bias the workpiece W with an appropriate biasing force.

[0054] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0055] [Aspect 1] a laser irradiation unit capable of irradiating a laser onto the workpieces to be joined together and movable relative to the workpieces; a forward biasing member that is provided in front of the laser irradiation unit in a movement direction of the laser irradiation unit relative to the workpiece and biases the workpiece; a rearward biasing member that is provided behind the laser irradiation unit in the movement direction and biases the workpiece; a front sensor capable of detecting the biasing force of the workpiece by the front biasing member; a rear sensor capable of detecting the biasing force of the workpiece by the rear biasing member; an adjustment unit that adjusts the biasing force of the front biasing member on the workpiece based on a detection value of the front sensor, and adjusts the biasing force of the rear biasing member on the workpiece based on a detection value of the rear sensor, The adjustment unit adjusts the biasing force of the workpiece by the rear biasing member and the biasing force of the workpiece by the rear biasing member so that the biasing force of the workpiece by the rear biasing member and the biasing force of the workpiece by the front biasing member are different from each other during irradiation of the laser by the laser irradiation unit.

[0056] In this laser joining device, the force of the rearward biasing member and the force of the forward biasing member are adjusted so that they are different from each other during laser irradiation. Therefore, even if the part of the workpiece that is irradiated with the laser becomes softer or slightly warped compared to before the laser irradiation, poor joining caused by the force of the rearward biasing member being too large or too small on that part is suppressed.

[0057] [Aspect 2] The laser joining device of aspect 1, wherein the adjustment unit adjusts the biasing force of the workpiece by the front biasing member and the biasing force of the rear biasing member so that the biasing force of the workpiece by the rear biasing member is smaller than the biasing force of the workpiece by the front biasing member during irradiation of the laser by the laser irradiation unit.

[0058] In this aspect, the biasing forces of the rear biasing member are adjusted so that they are smaller than the biasing force of the front biasing member during laser irradiation. Therefore, even if the portion of the workpiece irradiated with the laser becomes softer than before laser irradiation, poor joining caused by the biasing force of the rear biasing member being excessively large on that portion is suppressed.

[0059] [Aspect 3] The laser joining device of aspect 2, wherein the adjustment unit adjusts the urging force of the rear urging member on the workpiece so that the urging force of the rear urging member on the workpiece during irradiation of the laser by the laser irradiation unit is smaller than the urging force of the rear urging member on the workpiece at the start of irradiation of the laser by the laser irradiation unit.

[0060] In this embodiment, for example, even when the workpiece contains a resin material, that is, when the workpiece becomes softer after laser irradiation than when laser irradiation begins due to melting caused by the heat of the laser, it is possible to bias the workpiece with an appropriate biasing force.

[0061] [Aspect 4] A memory unit is further provided for storing area-specific set values, which are biasing forces preset for different joining areas of the workpiece, A laser joining device described in any one of aspects 1 to 3, wherein the adjustment unit adjusts the biasing force of the workpiece by the front biasing member and the rear biasing member so that the detection values ​​of the front sensor and the rear sensor become the set values ​​for each area.

[0062] [Aspect 5] A laser joining device as described in aspect 4, wherein the adjustment unit adjusts the biasing force of the workpiece by the front biasing member and the rear biasing member to the region-specific set value in the second joining region before the laser irradiation unit moves from a first joining region to a second joining region included in the mutually different joining regions.

[0063] [Aspect 6] Each of the front biasing member and the rear biasing member is a biasing unit capable of applying the biasing force to the workpiece; a support connected to the biasing unit; a rotary pressing body that is supported by the support body so as to be rotatable relative to the support body and presses the workpiece; a guide rail extending along a direction in which the biasing force is applied by the biasing unit; a slider movable along the guide rail; A laser joining apparatus according to any one of aspects 1 to 5, further comprising: a connecting plate that connects the support body and the slider.

[0064] In this embodiment, the support body and the rotary pressing body move along the guide rail together with the slider via the connecting plate, so that the direction in which the rotary pressing body urges the workpiece is stable.

[0065] [Aspect 7] the front sensor detects the position of the connecting plate of the front biasing member; Aspect 7. The laser joining apparatus according to aspect 6, wherein the rear sensor detects a position of the connecting plate of the rear biasing member.

[0066] In this aspect, each sensor detects the position of the connecting plate that moves together with the rotary pressing body, so that it is possible to adjust the biasing force of each biasing member.

[0067] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present invention is defined by the claims, not by the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0068] 1 Laser joining device, 100 Laser irradiation unit, 200F Front biasing member, 200R Rear biasing member, 210 Biasing unit, 211 Cylinder, 212 Piston, 213 Rod, 214 Gas flow path, 220 Support body, 230 Rotary pressing body, 240 Guide rail, 250 Slider, 260 Connecting plate, 400F Front sensor, 400R Rear sensor, 500 Control unit, 510 Adjustment unit, 520 Memory unit, 530 Area identification unit, L Laser, W Work.

Claims

1. a laser irradiation unit capable of irradiating a laser onto the workpieces to be joined together and movable relative to the workpieces; a forward biasing member that is provided in front of the laser irradiation unit in a movement direction of the laser irradiation unit relative to the workpiece and biases the workpiece; a rearward biasing member that is provided behind the laser irradiation unit in the movement direction and biases the workpiece; a front sensor capable of detecting the biasing force of the workpiece by the front biasing member; a rear sensor capable of detecting the biasing force of the workpiece by the rear biasing member; an adjustment unit that adjusts the biasing force of the front biasing member on the workpiece based on a detection value of the front sensor, and adjusts the biasing force of the rear biasing member on the workpiece based on a detection value of the rear sensor, The adjustment unit adjusts the biasing force of the workpiece by the rear biasing member and the biasing force of the workpiece by the rear biasing member so that the biasing force of the workpiece by the rear biasing member and the biasing force of the workpiece by the front biasing member are different from each other during irradiation of the laser by the laser irradiation unit.

2. 2. The laser joining device according to claim 1, wherein the adjustment unit adjusts the biasing force of the workpiece by the front biasing member and the biasing force of the workpiece by the rear biasing member so that the biasing force of the workpiece by the rear biasing member is smaller than the biasing force of the workpiece by the front biasing member during irradiation of the laser by the laser irradiation unit.

3. 2. The laser joining device according to claim 1, wherein the adjustment unit adjusts the biasing force of the workpiece by the rear biasing member during irradiation of the laser by the laser irradiation unit so that the biasing force of the workpiece by the rear biasing member at the start of irradiation of the laser by the laser irradiation unit is smaller.

4. A memory unit is further provided for storing area-specific set values, which are biasing forces preset for different joining areas of the workpiece, 2. The laser joining device according to claim 1, wherein the adjustment unit adjusts the biasing force of the workpiece by the front biasing member and the rear biasing member so that the detection values ​​of the front sensor and the rear sensor become the set values ​​for each area.

5. 5. The laser joining device according to claim 4, wherein the adjustment unit pre-adjusts the biasing force of the workpiece by the front biasing member and the rear biasing member to be the region-specific set value in the second joining region before the laser irradiation unit moves from a first joining region to a second joining region included in the mutually different joining regions.

6. Each of the front biasing member and the rear biasing member is a biasing unit capable of applying the biasing force to the workpiece; a support connected to the biasing unit; a rotary pressing body that is supported by the support body so as to be rotatable relative to the support body and presses the workpiece; a guide rail extending along a direction in which the biasing force is applied by the biasing unit; a slider movable along the guide rail; The laser joining device according to claim 1 , further comprising: a connecting plate that connects the support body and the slider.

7. the front sensor detects the position of the connecting plate of the front biasing member; The laser joining device according to claim 6 , wherein the rear sensor detects a position of the connecting plate of the rear biasing member.

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