JP6133685B2 - Seam welding equipment - Google Patents

Description

  The present invention relates to a seam welding apparatus for welding a lid to a container of a circuit element such as an IC or a crystal resonator.

The sealing operation of circuit elements such as an IC and a crystal resonator is performed as a final manufacturing process after the circuit elements are housed in a package and wiring and test adjustment operations are performed. Examples of the sealing method include resin sealing and airtight sealing.
The hermetic sealing method is a method in which the element is housed and fixed in a metal or ceramic package, and the element is completely sealed by covering with a lid (lid) in a dry inert gas atmosphere. According to this hermetic sealing method, impurities such as moisture do not enter, and since sealing is performed by local heating, the influence of thermal stress is small, and high sealing reliability can be obtained compared to resin sealing.

There is a seam welding apparatus that welds a lid to a package using a seam joining method which is one of the hermetic sealing methods. In this seam welding apparatus, a current is applied to a workpiece while applying pressure to the workpiece by a disk-shaped roller electrode, whereby the workpiece is melted by the generated Joule heat to obtain a joint.
FIG. 4 is a diagram for explaining a sealing operation by the seam welding apparatus. The seam welding apparatus includes disk-shaped roller electrodes 100a and 100b, conductive shafts 101a and 101b that supply power to the roller electrodes 100a and 100b, electrode holders 102a and 102b that supply power to the conductive shafts 101a and 101b, and electrode holders 102a, And electrode holding arms 103a and 103b for holding 102b. In FIG. 4, 104 is a chip such as an IC or a crystal resonator, 105 is a package for housing the chip 104, and 106 is a lid.

In this seam welding apparatus, the roller electrodes 100a and 100b are brought into contact with the lid 106 under a predetermined pressure. Then, while moving the tray or electrode holding arms 103a and 103b (not shown) on which the package 105 is placed, the power supply block 102a, the conductive shaft 101a, the roller electrode 100a, the lid 106, the roller electrode 100b, the conductive shaft 101b, and the power supply block 102b are referred to. The lid 106 is welded to the package 105 by passing a current through the path.
However, in the conventional seam welding apparatus, when the roller electrodes 100a and 100b are lifted after the end of welding, there is a problem that the workpiece (the package 105 and the lid 106) is lifted while being attached to the roller electrodes 100a and 100b. .

  On the other hand, the applicant has proposed a method for preventing the adhesion of the workpiece to the roller electrode (see Patent Document 1). In the method disclosed in Patent Document 1, the workpiece is moved in the direction A in FIG. 5A while the roller electrodes 100a and 100b are in contact with the workpiece, or the roller electrodes 100a and 100b are moved in FIG. The roller electrodes 100a and 100b are rotated to perform welding by moving in the direction B, and the energization to the roller electrodes 100a and 100b is stopped after the welding is completed, and the workpiece is moved in the direction B. By moving the roller electrodes 100a and 100b in the direction A, as shown in FIG. 5B, the roller electrodes 100a and 100b are rotated by a small angle in the direction opposite to that during welding, and then shown in FIG. 5C. Thus, the roller electrodes 100a and 100b are raised.

Japanese Patent No. 3194208

As described above, in the method disclosed in Patent Document 1, the work is peeled off from the roller electrode by rotating the roller electrode by a minute angle in the direction opposite to that during welding.
However, since the mass of the workpiece has become lighter due to the progress of miniaturization of the workpiece, even if the technique disclosed in Patent Document 1 is applied, it has become difficult to prevent the workpiece from adhering to the roller electrode.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a seam welding apparatus that can prevent adhesion of a work to a roller electrode after completion of welding and improve work efficiency. .

The seam welding apparatus of the present invention is a plate-shaped plate made of a pair of roller electrodes, an electrode holder for pivotally supporting the roller electrodes via a conductive shaft and simultaneously supplying power to the roller electrodes, and an insulating material. , A suspension mechanism that supports the retainer in a suspended manner between the pair of roller electrodes, and the electrode holder and the suspension mechanism that are perpendicular to the workpiece to be welded placed on the tray. A drive mechanism for moving the presser in a direction perpendicular to the workpiece via the suspension mechanism according to the movement of the electrode holder, and the drive mechanism includes seam welding. Prior to performing seam welding, the electrode holder and the suspension mechanism are lowered in a direction approaching the workpiece, and after seam welding is finished, the electrode holder and the suspension mechanism are separated from the workpiece. The presser raising / lowering mechanism causes the presser to contact the work before the pair of roller electrodes contact the two sides of the work when the electrode holder and the suspension mechanism are lowered. When the pair of roller electrodes comes into contact with the workpiece, the presser is raised and separated from the workpiece, and when the electrode holder and the suspension mechanism are raised, the presser is lowered by its own weight, thereby the roller electrode The presser is brought into contact with the work when it is separated from the work, and the state where the press continues to press the work is maintained for a certain period.
Further, in one configuration example of the seam welding apparatus of the present invention, the suspending mechanism is configured to support the presser in a form of suspending between the pair of roller electrodes, and to move the support member up and down. A presser holder for supporting the presser lifting mechanism, wherein the presser lifting mechanism has an outer diameter larger than an outer diameter of the roller electrode and an inner diameter larger than a diameter of the conductive shaft, and one of the pair of roller electrodes A lifting ring made of an insulating material fitted on the conductive shaft, and a transmission mechanism for transmitting the movement of the lifting ring in a direction perpendicular to the workpiece to the support member, the drive mechanism including the electrode holder Is supported so that it can be moved up and down, and at the same time, the electrode holder and the holder are lowered in a direction approaching the workpiece before supporting the holder and performing seam welding. The electrode holder and the holding holder are lifted in a direction away from the workpiece after the seam welding is completed, and the pressing is performed before the pair of roller electrodes come into contact with the two sides of the workpiece when the holding holder is lowered. When the pair of roller electrodes come into contact with the work and are lifted away from the work, and when the holding holder is raised, the support member and the presser are lowered by their own weight. The roller electrode comes into contact with the workpiece when it is separated from the workpiece, and the lifting ring pushes up the support member via the transmission mechanism when it comes into contact with the tray as the electrode holder is lowered. The presser is lifted and separated from the work, and the electrode holder is lifted away from the tray via the transmission mechanism. Until stop movement of the serial support member, in which the pressing is characterized in that to maintain a state to hold down the workpiece.

  Further, in one configuration example of the seam welding apparatus of the present invention, the transmission mechanism is rotatable about a rotation axis along a horizontal direction with the tray in a plane perpendicular to the tray. A first arm attached to a lower end of the holding holder; and a second arm attached to the support member so that a lower surface thereof is in contact with an upper surface of the first arm. When the rotation shaft is a fulcrum, the end of the first arm located on the opposite side of the fulcrum across the press and the second arm abut, and the lifting ring is It contacts the lower surface of the first arm at a position closer to the fulcrum than a contact point between the first arm and the second arm.

  According to the present invention, even a small workpiece can be prevented from adhering to the roller electrode and floating after completion of seam welding, so that work efficiency can be improved. Further, in the present invention, since it is not necessary to rotate the roller electrode in the direction opposite to that during welding, the time required for seam welding can be shortened. Further, the present invention can be applied to welding in a vacuum.

  In the present invention, the first arm and the second arm are provided, and the first arm located on the opposite side of the fulcrum with the pressing member interposed therebetween when the pivot axis of the first arm is the fulcrum. The end and the second arm are brought into contact with each other, and the lifting ring is brought into contact with the lower surface of the first arm at a position closer to the fulcrum than the contact point between the first arm and the second arm. Thus, the amount of lift when the presser leaves the workpiece can be made larger than the lift amount by which the lifting ring pushes up the first arm, and the presser can be separated greatly from the workpiece with a small lift amount of the lifting ring. it can.

It is the front view and side view of the electrode part of the seam welding apparatus which concern on embodiment of this invention. It is a figure explaining operation | movement of the seam welding apparatus which concerns on embodiment of this invention. It is a figure explaining operation | movement of the seam welding apparatus which concerns on embodiment of this invention. It is a figure explaining the sealing operation | work by the conventional seam welding apparatus. It is a figure explaining the method of preventing adhesion of the workpiece | work to a roller electrode in the conventional seam welding apparatus.

[Principle of the Invention]
The inventor prevents the workpiece from adhering to the roller electrode by forcibly pressing the workpiece instead of peeling the workpiece from the roller electrode by rotating the roller electrode in the direction opposite to that during welding. I came up with it. If there is a press during welding, the work surface may be damaged or the welding may be affected. Therefore, it is preferable that the press is separated from the work during welding and the press is effective only when the electrode is raised. Further, since welding may be performed in a vacuum, it is preferable that the presser can be driven without using an actuator such as a pump or a solenoid. Furthermore, since the distance between the two roller electrodes becomes narrower due to the progress of miniaturization of the workpiece and it is necessary to put a press between the roller electrodes, it is preferable that the press is an insulator.

[Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a front view of an electrode portion of a seam welding apparatus according to an embodiment of the present invention, and FIG. 1B is a side view of the electrode portion viewed from the left side of FIG. In FIG. 1B, the roller electrode and the electrode holder are indicated by broken lines in order to make it easier to understand the structure of the pressing portion, which is a characteristic configuration of the present embodiment.

  The seam welding apparatus of the present embodiment includes a pair of disk-shaped roller electrodes 1a and 1b made of a conductive material such as metal, cylindrical conductive shafts 2a and 2b made of a conductive material such as metal, and a conductive shaft. Metal that restricts axial movement of the electrode shafts 3a, 3b made of a conductive material such as metal and the conductive shafts 2a, 2b, which supports the shafts 2a, 2b in a rotatable manner and supplies power to the conductive shafts 2a, 2b. Stopper 4a, 4b made of a conductive material such as a plate, plate-like presser 5 made of an insulating material, and support 5 is suspended so that presser 5 is positioned between a pair of roller electrodes 1a, 1b. An elevating part 6 as a supporting member, an arm 7 attached to the elevating part 6 so that the lower surface abuts on an upper surface of an arm 9 to be described later, a holding holder 8 that supports the elevating part 6 so as to be movable up and down, and a workpiece 20 In the example of FIG. 4, the holding holder 8 is arranged so as to be rotatable in a plane perpendicular to the tray 21 around the axis 10 along the horizontal direction of the tray 21 on which the package 105 and the lid 106) are placed. An arm 9 attached to the lower end and an annular lifting ring 11 made of an insulating material are provided. The elevating part 6 and the presser holder 8 constitute a suspension mechanism for the presser 5, and the arms 7 and 9 and the elevating ring 11 constitute a presser elevating mechanism. The arms 7 and 9 constitute a transmission mechanism that transmits the movement of the lifting ring 11 to the lifting unit 6. The elevating part 6, the arms 7 and 9, and the holding holder 8 may be made of a conductive material or an insulating material.

  A drive mechanism (not shown) supports the electrode holders 3a and 3b so as to be movable up and down. The approximate vertical position of the electrode holders 3a and 3b is controlled by a drive mechanism. Furthermore, the electrode holders 3a and 3b reach the lowest position in the vertical movement range restricted by the drive mechanism in a state where the vertical position is not suppressed by the contact between the roller electrodes 1a and 1b and the workpiece 20. It will be getting off by its own weight. The electrode holders 3a and 3b are electrically connected to a power source (not shown) by wires or the like.

  The cylindrical conductive shafts 2a and 2b are supported by being inserted into through holes of the electrode holders 3a and 3b, and are rotated by sliding friction. The roller electrodes 1a and 1b are attached to one end of the conductive shafts 2a and 2b, and stoppers 4a and 4b for restricting the axial movement of the conductive shafts 2a and 2b are attached to the other ends of the conductive shafts 2a and 2b. It has been. Thus, the electrode holders 3a and 3b function as bearings for the conductive shafts 2a and 2b, and at the same time serve to supply current to the conductive shafts 2a and 2b. The roller electrodes 1a and 1b are arranged so as to come into contact with a desired joined portion of the workpiece 20 when the electrode holders 3a and 3b are lowered.

  A lifting ring 11 is fitted on the conductive shaft 2a between the roller electrode 1a and the electrode holder 3a. The diameter of the through hole of the lifting ring 11 through which the conductive shaft 2a passes is larger than the diameter of the conductive shaft 2a. Therefore, the lifting ring 11 is fitted to the conductive shaft 2a so as to be movable up and down. Further, the outer diameter D2 of the lifting ring 11 is set to be larger by a predetermined value α than the dimension obtained by adding the diameter D1 of the roller electrodes 1a and 1b to the height H of the workpiece 20 (D2 = H + D1 + α). . The movable range in which the elevating ring 11 is restricted by the conductive shaft 2a is set to a value equal to or greater than the predetermined value α. As described above, the lifting ring 11 is disposed between the roller electrode 1a and the electrode holder 3a, and is disposed so as to contact the tray 21 outside the workpiece 20 when the electrode holder 3a is lowered. ing.

  On the other hand, the holding holder 8 is fixed to the drive mechanism. The holding holder 8 supports the arm 9 so as to be rotatable. The arm 9 can rotate clockwise and counterclockwise about the shaft 10. Moreover, the holding holder 8 supports the raising / lowering part 6 so that an up-down movement is possible. A presser 5 and an arm 7 are fixed to the elevating part 6. The presser 5 is disposed between the roller electrodes 1a and 1b, and is disposed so as to come into contact with the upper surface of the work 20 (the upper surface of the lid 106 in the example of FIG. 4) when the presser holder 8 is lowered. Yes. The vertical positional relationship between the holding holder 8 and the arm 9 and the lifting ring 11 is such that the lifting ring 11 is lowered to the lowest position in the vertical movement range regulated by the conductive shaft 2a. It is defined that the upper part of the ring 11 is in contact with the lower part of the arm 9.

  The approximate vertical position of the elevating unit 6 is controlled by a drive mechanism. Therefore, the approximate vertical position of the presser 5 is also controlled by the drive mechanism. Further, when the lifting ring 11 is not in contact with the tray 21, the arm 7 and the arm 9 are in contact with each other, and the arm 9 and the lifting ring 11 are in contact with each other to be pressed downward, so that the conductive shaft 2a. The arm 9 is moved down to the lowest position in the vertical movement range regulated by the above and the movement of the arm 9 is suppressed. Thereby, the vertical position of the arm 7 and the pressing holder 8 is determined, and the vertical position of the pressing 5 is determined.

  During seam welding, the horizontal positional relationship between the workpiece 20 and the roller electrodes 1a and 1b (left and right direction in FIG. 1B) changes. Accordingly, the horizontal positional relationship between the workpiece 20 and the presser 5 is changed. Will also change. Therefore, it is desirable that the horizontal dimension of the presser 5 is larger than the horizontal dimension of the workpiece 20.

  The positional relationship between the roller electrodes 1a, 1b, the presser 5 and the lifting ring 11 is such that when the electrode holders 3a, 3b and the presser holder 8 are lowered, the presser 5 comes into contact with the workpiece 20 and then moves up and down. It is defined that the ring 11 comes into contact with the tray 21 and the roller electrodes 1a and 1b come into contact with the workpiece 20 after this contact. When the electrode holders 3a, 3b and the holding holder 8 are raised while the roller electrodes 1a, 1b are in contact with the workpiece 20, the roller ring 1a, 1b is separated from the workpiece 20, and then the lifting ring 11 is moved to the tray. It is defined that the presser 5 is separated from the workpiece 20 and thereafter the presser 5 is separated from the workpiece 20.

Next, the operation of the seam welding apparatus of the present embodiment will be described in detail with reference to FIGS. 2 (A), 2 (B), 3 (A), and 3 (B).
First, when the electrode holders 3a and 3b and the holding holder 8 are lowered by the driving mechanism, the roller electrodes 1a and 1b, the holding 5 and the lifting ring 11 are also lowered, and the roller electrodes 1a and 1b come into contact with the workpiece 20. Before pressing, the presser 5 comes into contact with the workpiece 20 (FIG. 2A). Thereby, the descent of the presser 5 stops.

When the electrode holders 3a and 3b and the holding holder 8 are further lowered, the lifting ring 11 comes into contact with the tray 21 (FIG. 2B).
Subsequently, when the electrode holders 3a, 3b and the holding holder 8 are further lowered, the elevating ring 11 cannot be lowered because it is in contact with the tray 21, and is fixed up and down regulated by the conductive shaft 2a. Begins to rise within the range of motion. As a result, the lifting ring 11 pushes up the arm 9, so that the arm 9 pushes up the arm 7, and the lifting unit 6 and the presser 5 start to rise (FIG. 3A).

  When the electrode holders 3a and 3b and the holding holder 8 are further lowered, the roller electrodes 1a and 1b come into contact with the workpiece 20 (FIG. 3B). Thereby, the lowering of the electrode holders 3a and 3b is suppressed. The drive mechanism detects that the roller electrodes 1a, 1b and the work 20 have come into contact with each other because the electrode holders 3a, 3b do not descend despite the attempt to lower the electrode holders 3a, 3b. , 3b and the holding holder 8 are stopped.

  As described above, the outer diameter D2 of the lifting ring 11 is set to be larger by the predetermined value α than the dimension obtained by adding the diameter D1 of the roller electrodes 1a and 1b to the height H of the workpiece 20. Therefore, when the roller electrodes 1a and 1b come into contact with the workpiece 20, the lifting ring 11 pushes up the arm 9 by the predetermined value α. At this time, the arm 9 rotates clockwise about the shaft 10. Assuming that the point where the arm 9 and the lifting ring 11 are in contact with each other with the shaft 10 as a fulcrum is the force point, the end of the arm 9 located on the opposite side of the fulcrum across the presser 5 is the action point that pushes up the arm 7. Is closer to the fulcrum than the point of action, and therefore, the amount by which the arm 9 pushes up the arm 7 is larger than the amount by which the lifting ring 11 pushes up the arm 9. When the arm 9 pushes up the arm 7, the elevating part 6 and the presser 5 are raised, so that the lift amount of the presser 5 is also larger than the lift amount by which the lift ring 11 pushes the arm 9. Thus, when the roller electrodes 1 a and 1 b come into contact with the workpiece 20, the presser 5 is separated from the workpiece 20.

  After the roller electrodes 1a and 1b come into contact with the workpiece 20, seam welding is performed as in the conventional case. That is, the power source (not shown) is moved while moving the electrode holders 3a and 3b and the holding holder 8 in the horizontal direction (the left-right direction in FIG. 1B and the direction perpendicular to the paper surface in FIG. 3B) by the drive mechanism. From the electrode holder 3a, the conductive shaft 2a, the roller electrode 1a, the work 20, the roller electrode 1b, the conductive shaft 2b, and the electrode holder 3b, the work 20 is welded (in the example of FIG. Is welded to the package 105).

When the energization from the power supply is finished, the seam welding is finished. After the seam welding is completed, the operation is performed in the order of FIG. 3 (B), FIG. 3 (A), FIG. 2 (B), and FIG. 2 (A).
When the electrode holders 3a, 3b and the holding holder 8 are raised by the drive mechanism, the shaft 10 of the arm 9 is also raised, so that the arm 9 depends on the weight of the holding 5, the lift 6 and the arm 7, and the weight of the arm 9 itself. Begins to rotate counterclockwise. Thereby, the raising / lowering part 6 and the presser 5 begin to fall (FIG. 3 (A)).

  When the electrode holders 3a and 3b and the presser holder 8 are further raised, the roller electrodes 1a and 1b are separated from the work 20 after the presser 5 that has started to descend comes into contact with the work 20, or the presser 5 is Simultaneously with the contact, the roller electrodes 1a and 1b are separated from the workpiece 20 (FIG. 2B). Since a downward force due to the weight of the elevating part 6 and the arm 7 is applied to the presser 5, even if the work 20 is attached to the roller electrodes 1a and 1b, the work 20 is peeled off from the roller electrodes 1a and 1b. The presser 5 presses the workpiece 20.

  When the electrode holders 3a, 3b and the holding holder 8 are further raised, the lifting ring 11 is separated from the tray 21 (FIG. 2A). Even when the elevating ring 11 is separated from the tray 21, the presser 5 keeps pressing the work 20.

  When the electrode holders 3a, 3b and the holding holder 8 are further raised, the lifting ring 11 descends to the lowest position in the vertical movement range restricted by the conductive shaft 2a, so that the arm 9 rotates counterclockwise. Stops. When the electrode holders 3a and 3b and the presser holder 8 are further raised from this state, the arm 9 pushes up the arm 7, so that the elevating part 6 and the presser 5 are raised and the presser 5 is separated from the workpiece 20. Thus, the state of FIG. 1 (A) and FIG. 1 (B) is restored.

  As described above, in the present embodiment, the presser 5 is brought into contact with the work 20 before the roller electrodes 1a and 1b come into contact with the work 20, and when the roller electrodes 1a and 1b come into contact with the work 20, the presser 5 Is separated from the workpiece 20 and seam welding is performed. The reason why the presser 5 is separated from the work 20 is that the work 20 is heated at the time of seam welding, so that the presser 5 made of an insulating material such as resin may be melted, and the presser 5 may damage the work surface. This is because there is a possibility of attaching or affecting the welding. The presser 5 is brought into contact with the workpiece 20 when the roller electrodes 1a and 1b are separated from the workpiece 20 after seam welding. The presser 5 maintains the state in which the roller 20 is kept pressing the workpiece 20 for a while after the roller electrodes 1a and 1b are separated from the workpiece 20, so that even if the workpiece 20 is attached to the roller electrodes 1a and 1b, Can be peeled off from the roller electrodes 1a and 1b. As described above, in the present embodiment, even if the workpiece 20 is small, it is possible to prevent the workpiece 20 from adhering to the roller electrodes 1a and 1b after the seam welding is finished, so that the working efficiency can be improved. it can.

  Further, in the present embodiment, unlike the technique disclosed in Patent Document 1, it is not necessary to rotate the roller electrodes 1a and 1b in the direction opposite to that during welding, so the time required for seam welding can be shortened. . Moreover, in this Embodiment, only the electrode holders 3a and 3b and the press holder 8 can be driven, and the press 5 can be driven without using an actuator such as a pump or a solenoid. Since the drive mechanism can be disposed outside the vacuum chamber that houses the seam welding apparatus, the present invention can be applied to welding in a vacuum.

  In the present embodiment, when the electrode holders 3a and 3b and the holding holder 8 are lowered, the lifting ring 11 is brought into contact with the tray 21 after the pressing 5 is brought into contact with the workpiece 20. Since the presser 5 may be separated from the work 20 when the roller electrodes 1 a and 1 b come into contact with the work 20, the lifting ring 11 may be in contact with the tray 21 at the same time as the presser 5 comes into contact with the work 20. In addition, when the electrode holders 3a and 3b and the holding holder 8 are raised, the holding ring 5 is separated from the workpiece 20 after the lifting ring 11 is separated from the tray 21, but the roller electrodes 1a and 1b are separated from the workpiece 20. Since the presser 5 may be separated from the workpiece 20 after being separated from the workpiece 20, the presser 5 may be separated from the workpiece 20 at the same time as the lifting ring 11 is separated from the tray 21.

  The present invention can be applied to seam welding.

  DESCRIPTION OF SYMBOLS 1a, 1b ... Roller electrode, 2a, 2b ... Conductive shaft, 3a, 3b ... Electrode holder, 4a, 4b ... Stopper, 5 ... Pressing, 6 ... Lifting part, 7, 9 ... Arm, 8 ... Holding holder, 10 ... Shaft 11 ... Lifting ring, 20 ... Workpiece, 21 ... Tray.

Claims (3)

A pair of roller electrodes;
An electrode holder for pivotally supporting the roller electrode via a conductive shaft and simultaneously supplying power to the roller electrode;
A plate-shaped presser made of an insulating material;
A suspension mechanism for supporting the presser in a suspended manner between the pair of roller electrodes;
A drive mechanism for moving the electrode holder and the suspension mechanism in a direction perpendicular to a workpiece to be welded placed on a tray;
A presser raising / lowering mechanism that moves the presser in a direction perpendicular to the workpiece via the suspension mechanism according to the movement of the electrode holder;
The drive mechanism lowers the electrode holder and the suspension mechanism in a direction approaching the workpiece before performing seam welding, and moves the electrode holder and the suspension mechanism away from the workpiece after seam welding is completed. Raise,
The presser raising / lowering mechanism causes the presser to contact the work before the pair of roller electrodes come into contact with two sides of the work when the electrode holder and the suspension mechanism are lowered, and the pair of roller electrodes When the roller electrode is separated from the work by raising the presser away from the work at the time of contact with the work and lowering the presser with its own weight when the electrode holder and the suspension mechanism are lifted The seam welding apparatus is characterized in that the presser is brought into contact with the workpiece and the state in which the presser continues to press the workpiece is maintained for a certain period of time. The seam welding device according to claim 1,
The suspension mechanism is
A support member that supports the presser in a suspended form between the pair of roller electrodes;
It consists of a holding holder that supports the support member so as to move up and down,
The presser lifting mechanism is
A lifting ring having an outer diameter larger than the outer diameter of the roller electrode and an inner diameter larger than the diameter of the conductive shaft, and made of an insulating material fitted to the conductive shaft of one of the pair of roller electrodes. When,
A transmission mechanism that transmits the movement of the lifting ring in a direction perpendicular to the workpiece to the support member;
The drive mechanism supports the electrode holder so that the electrode holder can move up and down, and also supports the pressing holder, and lowers the electrode holder and the pressing holder in a direction approaching the workpiece before performing seam welding, thereby performing seam welding. Raise the electrode holder and the holding holder in a direction away from the workpiece after completion,
The presser comes into contact with the work before the pair of roller electrodes come into contact with the two sides of the work when the presser holder is lowered, and rises when the pair of roller electrodes comes into contact with the work. The support member and the presser are lowered by their own weight when the presser holder is lifted away from the work and comes into contact with the work when the roller electrode leaves the work,
The lifting ring pushes up the support member via the transmission mechanism when it comes into contact with the tray as the electrode holder descends, thereby lifting the presser away from the workpiece, A seam welding apparatus that maintains the state in which the presser keeps pressing the workpiece until it moves away from the tray as it rises and stops the movement of the support member via the transmission mechanism. The seam welding apparatus according to claim 2,
The transmission mechanism is
A first arm attached to a lower end of the holding holder so as to be rotatable in a plane perpendicular to the tray around a rotation axis along a horizontal direction with the tray;
A second arm attached to the support member such that a lower surface is in contact with an upper surface of the first arm;
When the rotation axis of the first arm is a fulcrum, the end of the first arm located on the opposite side of the fulcrum across the press and the second arm abut,
The seam welding apparatus according to claim 1, wherein the elevating ring contacts the lower surface of the first arm at a position closer to the fulcrum than a contact point between the first arm and the second arm.

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