KR101086091B1 - Power source device - Google Patents

Abstract

At least part of both sides of the cover 14 substantially contacts the case 2 in a state of covering the panel 12 having a plurality of operators for setting the characteristics of the power supply circuit for the purpose of streamlining the setting work of the parameters. The cover 14 is attached to the case so as to freely rotate about an axis almost perpendicular to both sides at this contact portion. In the case 2, a plurality of circular horns 26 are provided on the circumference around the axis, and these circular horns 26 are formed so that the convex portion 22 can invade.

Description

Power unit {POWER SOURCE DEVICE}

1 is a side view of a power supply device of a first embodiment of the present invention;

2 is a plan view of the power supply device of FIG.

3 is a longitudinal sectional view showing an intermediate portion of the power supply case of FIG. 1;

4 is a front view of the power supply device of FIG. 1;

5 is a partially omitted longitudinal cross-sectional view of the front portion of the power supply case of FIG. 1;

6 is a partially omitted plan view of a cover of the power supply case of FIG. 1;

7 is a partially broken side view of the cover of FIG. 1, FIG.

8 is a rear view of the power supply device of FIG.

9 is an enlarged fragmentary cutaway view of the rear portion of the power supply of FIG.

10 is a partially omitted perspective view of the inner cover used in the power supply of FIG. 1, FIG.

11 is a plan view and a side view of an intermediate portion of the power supply case of FIG. 1, and

12 is a partially omitted rear view of the front portion of the power supply case of FIG. 1.

<Explanation of symbols for the main parts of the drawings>

2: case 4: front part

6: back part 8: middle part

20: axis 22: convex portion                 

26: round foil

The present invention relates in particular to a power supply, for example a welding power supply.

There are various types of welding such as accommodation welding, TIG welding, etc. A power supply for welding machines corresponding to these types is used. The basic composition thereof is as follows. The commercial AC voltage is converted into a DC voltage by an input rectifier and a smoothing capacitor. The DC voltage is converted into a high frequency voltage by an inverter. The high frequency voltage is transformed into a predetermined voltage by a transformer. The output rectifier converts the DC voltage into the load and supplies it to the load. If necessary, the DC voltage is converted into a low frequency AC voltage and supplied to the load. In this power supply unit, the DC voltage is converted into a high frequency voltage by the inverter. A small transformer can be used and the whole power supply can be miniaturized.

As mentioned above, types of welding include an accommodating welding, a direct current TIG welding, an alternating TIG welding, and the like.

When performing welding, the welding power supply has a constant current output characteristic in which the output current is constant even if the output voltage fluctuates. An output current setter for setting this output current value is provided in the panel of the welding power supply. In addition, in the case of water welding, when the start of welding or when the load of the torch and the base material is short-circuited, a hot start is performed in which a current larger than the output current flows and arcs are generated well. A hot start setter is provided on the panel to set the current flowing at the hot start. The panel is also provided with an indicator indicating the output voltage and the output current.

DC TIG welding is suitable for welding stainless steel, for example, and has a constant current output characteristic. Also, like welding, some require a hot start. In direct current TIG welding, the output current is made constant when welding a flat base material. However, in the case of welding a base material such as a pipe, especially when welding the bottom of the pipe, if a constant output current is supplied, the melt from the pipe needs to fall from the base material and be rewelded or melted to the TIG welding electrode of the torch. There is a possibility that seafood may adhere or the welding electrode may be damaged. Therefore, when the output current is a pulse current and the face current IB flows during the pulse current, for example, a molten nail formed at the bottom of the pipe is cooled. This prevents the melt from falling from the molten nail or from adhering to the weld electrode of the torch.

In TIG welding, as a method of arc generation, a short current is generated by short circuiting the welding electrode and the base material, and then the welding electrode is separated from the base material, and a touch start method for generating arcs between the protons and the welding electrode is previously separated from the base material. Thus, there is a high frequency start method for generating arc by applying a high frequency and a high voltage of 5 to 20 kV at 1 to 3 MHz, for example.

The panel of the DC TIC welding power supply is provided with an output current setter and a hot start setter for setting the output current. Furthermore, the maximum pulse current (set output current) at the starting current when the pulse current is supplied as the output current. The upslope and downslope time adjusters, which set up-slope time for operating up to and down-slope time for decreasing from the maximum pulse current to the crater current flowing at the end of welding, are also displayed on the panel. Furthermore, a pulse frequency setter for setting the frequency of the pulse current and a pulse changer for switching the supply of the pulse current or the supply of the direct current are installed in the panel. In addition, an arc start switch for switching between touch start and high frequency start is provided on the panel. In addition, an indicator for displaying the output voltage and the output current is also provided on the panel.

AC TIG welding is used, for example, in the case of welding aluminum. Aluminum has a high melting point film so that a current flows using a DC power supply and the base material as the anode and the welding electrode as the cathode. Is not hot and welding is not possible. Therefore, when the base material is used as the cathode and the electrode as the anode, current flows (negative), hot electrons are released from the base material to remove the oxide film (cleaning effect). Welding is possible. However, in the case of the positive polarity, there is a cooling effect of cooling the electrode. Therefore, in the case of the alternating TIC welding, the cooling effect can be obtained together with the cleaning effect. The effect can be brought to the desired state.

This AC TIC welding also has a direct current TIC welding machine which can be used for direct current TIC welding. The panel of the power supply unit for the direct current TIC welding machine has an output current setter, a hot start setter for DC TIG welding, Upslope and downslope time setting devices, pulse frequency setting devices, pulse changers for the presence or absence of pulse currents, arc start changers for switching between touch start and high frequency start, indicators for output voltage and output current are installed on the panel. In addition, a frequency setter for setting the frequency of the voltage at the time of alternating current welding for AC TIG welding, and a waveform balance setter for setting the ratio between positive and negative polarities are also provided on the panel.

It is cumbersome to manufacture these various power supplies for welding separately. Since various settings are required for the above-described welding, the panel requires a large number of setters to manufacture one power supply that can be used for various welding. This not only complicates the configuration, but also complicates setting of each setter.

Accordingly, the present applicant has proposed a power supply device as shown in Japanese Patent Laid-Open No. 10-3079. This power supply unit has a welding process setting push button for setting welding process such as accommodation welding or direct current TIG welding on the panel, a parameter setting push button for selecting parameters of each welding process after selecting the welding process, and one setter. This setting device adjusts the output current, output voltage, and the like to cope with various welding. In addition, the panel is provided with a process indicator, a parameter indicator, an up / down push button, an output voltmeter, an output ammeter, and the like.

By the way, the power supply device for the welder is not only used indoors, but also used outdoors, and it is necessary to take countermeasures against spinning and dust. Therefore, the above panel is provided with a spinning and dustproof cover.

 However, in setting the welding process, the parameters, the output, and the like, the power supply device for the welding machine had to open each cover, so that the setting work could not be efficiently performed.

Therefore, an object of the present invention is to provide a power supply device capable of efficiently performing such setting work.

The power supply device according to the present invention includes a case. A panel is disposed in a part of the case. The panel includes a plurality of operators for setting characteristics of the power supply circuit disposed in the case. The cover covers the panel. The cover covers the panel so that at least a portion of both sides is generally in contact with the case and freely rotates about an axis almost perpendicular to the sides at this contact portion. It is also mounted to the case. For example, it is also possible to install a bearing part on the case side that protrudes an axis along the axis from both sides of the cover and supports the axis so as to be free to rotate. Protrude shafts toward both sides of the cover to form shaft holes with these shafts inserted on both sides of the cover. It is also good. In one direction of the sides of the case and cover, at least one convex portion is located on the circumference around the axis. A plurality of convex portions can be provided on the circumference, for example, at equal intervals. In one direction, a plurality of recesses into which the convex portions penetrate are located on the circumference. The convex portion penetrates into one concave portion in a state in which the cover covers the panel, and the cover is moved in a direction in which the cover opens the panel, whereby the convex portion is positioned at a position where the concave portion invading in sequence is changed. A recess is provided.

In the above-described power supply device, for example, when the cover is opened to operate the operator, the concave portions entering the convex portions are changed in sequence. Therefore, when the cover is opened up to a predetermined angle, the convex portions penetrate the concave portions so that the predetermined angles are maintained. The cover stops in position, and the cover does not close naturally even if you remove your hand from the cover. Therefore, setting of the operator can be easily performed since there is no need to support the cover by hand.

In addition, the cable can be introduced from the outside of the case to the inside using the introduction port installed in the case. In this case, a first clamp portion which is integrated with the case is formed in the vicinity of the introduction port. The first clamp portion is formed in a shape that encompasses almost half of the outer circumferential direction of the cable. The 2nd clamp part is attached with the 1st clamp part so that the whole outer periphery of the said cable may be enclosed.

In such a configuration, since the first clamp portion is formed integrally with the case, the cable can be clamped by pressing the cable into the first clamp portion to contact the cable with the second clamp portion and installing the second clamp portion in the first clamp portion. have. Therefore, the clamping operation can be easily performed.

The case may be constituted by having a front portion and a rear portion arranged to face each other at intervals, and an intermediate portion positioned between the front portion and the rear portion and contacting the front portion and the rear portion to connect the front portion and the back portion. have. A sheet is disposed in the intermediate portion so as to cover a component for a power circuit in the intermediate portion. The sheet extends into the front portion beyond the contact surface of the front portion and the intermediate portion from an upper portion thereof. And a second tongue piece extending into the rear portion beyond the contact surface between the intermediate portion and the rear portion from an upper portion of the sheet.

In such a configuration, even if rainwater intrudes from the contact surface of the front part and the intermediate part, the first tongue piece part flows to the seat side, so that the rain water does not contact the power circuit components surrounded by the sheet. The same is true when rainwater invades from the contact surface of the back portion and the middle portion.

 In addition, as described above, when the case includes a front portion, a back portion and an intermediate portion, it is possible to project the first protrusion toward the other direction of the contact surface of the front portion and the intermediate portion in one direction of the contact surface of the front portion and the intermediate portion. In this case, in the other direction of the contact surface of the front part and the intermediate part, a first recess is provided to penetrate the first protrusion. In one direction of the contact surface of the back portion and the intermediate portion, the second protrusion is projected toward the other direction of the contact surface of the back portion and the intermediate portion. In the other direction of the contact surface of the rear portion and the intermediate portion, a second recess is provided to penetrate the second protrusion.

In this configuration, since the first protrusion is engaged with the first recess and the second protrusion is engaged with the second recess, the joining of the front part and the middle part is not missed, and the joining of the back part and the middle part is not missed. .

The power supply device of the first embodiment of the present invention has a case 2 as shown in FIG. 1, for example, as a welding power supply device. The case 2 is made of synthetic resin composed of a front portion 4, a back portion 6 and an intermediate portion 8.

 The front part 4 and the back part 6 have a substantially parallel parallelepiped shape of the same dimension. The front portion 4 and the rear portion 6 are arranged to face each other at predetermined intervals.

The intermediate part 8 is arrange | positioned so that the back surface of these front part 4 and the front surface of the back part 6 may contact. The middle portion 8 has a substantially parallel rectangular parallelepiped shape and is composed of a right middle portion 8a and a left middle portion 8b, as shown in FIGS. 2 and 3. These right and left middle portions 8a, As shown in Fig. 3, the cross-sectional shape is substantially U-shaped with its end faces arranged upside down to face each other. A power supply circuit (not shown) of a welding power supply device is disposed in this intermediate portion 8. . Moreover, the handle 9 is formed so that it may be located in the upper center of the middle part 8 in the state which matched the right and left middle parts 8a, 8b.

In the upper part of the front part 2 shown in FIG. 4, the recessed part 10 which is inclined downward partly is formed. In this recessed part 10, the panel l2 as shown in FIG. 5 is arrange | positioned. The panel 12 is provided with an operator for setting a plurality of parameters for adjusting the characteristics of the power supply device, for example, a switch or a volume (not shown).

The dustproof cover 14 is mounted in the recess 10 so as to cover the panel 12 as shown in Fig. 4. The cover 14 is transparent and the cover 14 is not shown in Fig. 4, but the cover 14 is panel. Even in the state in which (12) is covered, the setting state of the panel 12 can be confirmed from the outside. In addition, in FIG. 4, the code | symbol 16 shows the cover 14 as one handle of an operator; Even when the panel 12 is covered, it protrudes outward of the cover 14 so that it can be operated from the outside.

At the top of both sides of the cover 14, discs 18 and 18 are formed, as shown in Fig. 6. The shafts 20 and 20 are moved outwardly substantially perpendicular to both sides from the center of the discs 18 and 18. As shown in Fig. 7, a plurality of convex portions 22 protrude outwards at an isometric angle on a circumference centered on the center of the axes 20 and 20. As shown in Figs.

On the other hand, in the recess 10, the cover 14 covers the panel 12 in the position of both sides corresponding to the shaft 20, 20 of the cover 14, the shaft 20, 20 as shown in FIG. ), For example, shaft holes 24 and 24 are formed to support the rotation freely. In the circumference | surroundings of these axial holes 24 and 24, the recessed part which can penetrate | engage and engage with each convex part 22, for example, circular horns 26 and 26 is formed so that the convex part 22 may correspond. The angles of these circular arcs 26 with respect to each other are formed equal to the angles of the convex portions 22 with respect to each other.

By inserting the shafts 20 and 20 of the cover 14 into the shaft holes 24 and 24, the cover 14 rotates around the shafts 20 and 20 and the cover 14 guides the panel 12. It can be opened and closed as indicated by the dotted line in l. In addition, since the convex portion 22 rotates in order to change the circular hools 26 engaged with each other in turn, the cover 14 can be fixed at every predetermined angle. Therefore, as shown in FIG. 1, the cover 14 can be fixed in a desired rotation position. Therefore, when operating the operator of the panel 12, it is not necessary to press the cover 14 by hand one by one, and parameter setting can be performed easily.

In Fig. 4, reference numeral 28 denotes a positive output terminal, reference numeral 30 denotes a negative output terminal, reference numeral 32 denotes an inert gas output terminal. This is a window for introducing air into the case 2. The reference numeral 36 denotes a connection terminal of the torch switch.

As shown in FIG. 8, the back part 6 includes a cable, for example, a power cable 38.

This is for supplying commercial AC power to the power supply circuit in the case 2. The power cable 38 is connected to the clamper 40 to prevent the power cable 38 from being pulled out of the case 2. The clamper 40 is composed of the first clamp portion 40a and the second clamp portion 40b, as shown in Fig. 9. All of them are made of synthetic resin and the first clamp portion 40a is formed on the back portion ( 6). The first clamp portion 40a is a recess 44 surrounding the outer periphery of about 3/4 of the circular inlet 42 of the power cable 38 formed in the rear portion 6. Has Moreover, the 2nd clamp part 40b is formed separately from the back part 6, and has the recessed part 46 which can surround the remaining outer periphery of the circular inlet 42. As shown in FIG.

The concave portion of the second clamp portion 40b to contact the power cable 38 with the concave portion 44 of the first clamp portion 40a and to press the power cable 38 toward the first clamp portion 40a. The part 46 is brought into contact with the power cable 38, and the fixing means, for example, the bolts 48 and 48, is penetrated through the second clamp part 40b to be screwed into the first clamp part 40a. butterfly clamping) to clamp the power cable (38) by fixing the second clamp portion (40b) to the first clamp portion (40a).

As this clamper 40, the 1st clamp part 40a is formed integrally with the back part 6. As shown in FIG. Conventionally, as the clamper used, the equivalent of the first clamp portions 40a and 40b is formed separately from the case, so that the equivalent of the first clamp portion 40a has to be installed in the case and the workability is deteriorated. . However, since the clamper 40 has the first clamp portion 40a integrally formed on the rear portion 6, it is not necessary to install the first clamp portion 40a on the rear portion 6, thus making the clamping work more efficient. In addition, since the first and second clamp portions 40a and 40b are made of synthetic resin, no rust occurs.

8 denotes an input terminal of the inert gas. Similarly, denoted by 5l is a window for exhausting air flowing in the case 2.

As indicated by the dotted line in Fig. 1, an inner cover 52 is disposed in the middle portion 8 to cover the power supply circuit. The inner cover 52 is made of a conductive material, for example, a metal foil, more specifically, an aluminum foil or Both sides of the copper foil are coated with a material having corrosion resistance and heat resistance such as heat resistant vinyl chloride or heat resistant polyester. Conductive carbon resin can be used instead of metal foil. Both sides of the metal foil are covered with the above materials. It is relatively flexible, and it can be made into a desired shape by folding and processing the appropriate cutting part in one plate-shaped object.

This inner cover 52 has both side walls 52R, 52L extending downward from the long side of the upper wall 52U, as shown in FIG. 10. The upper wall 52U, as shown in FIG. It is in a position to approach the top wall of the middle part 8 and has a size substantially coincident with the top wall of the middle part 8. Both ends of the upper wall 52U are located in the contact surface between the middle portion 8 and the front portion 4, and in the middle portion 8 near the contact surface between the middle portion 8 and the back portion 6. Both the wall 52R And 52L are in contact with the lower wall of the intermediate portion 8. The appropriate position of this inner cover 52 is connected to the reference potential point of the power supply circuit. Thus, this inner cover 52 functions as a shield case.

Further, tongue tongue portion 52a is formed from the end portion on the front side portion 4 side of the upper wall 52U toward the inside of front portion portion 4. The tongue portion portion 52a has a front portion (52U) of top wall portion 52U. It has the 1st inclination part 52a-1 which inclines upward at the edge part of the side 4), and has the 2nd inclination part 52a-2 which continues in the 1st inclination part 52a-1 and becomes a gentler inclination than this. The second tongue section 52b is similarly formed at the end of the back wall 6 side of the upper wall 52U. The tongue section 52b also has the first and second inclined sections 52a-l and 52a. It has the same 1st inclination part 52b-1 and 2nd inclination part 52b-2 as -2).

Further, tongue piece portions 52c and 52c are formed so as to penetrate into the front portion 4 from the end portions of the side walls 52R and 52L at the front portion 4 side. Similarly, the side walls 52R and 52L are formed. The tongue sections 52d and 52d are formed so as to penetrate into the rear section 6 at the end of the rear section 6 side of the side. These tongue sections 52c, 52c, 52d and 52d are also almost the front section 4 and the rear section. It extends to near the lower wall of (6).

Since the inner cover 52 contains a conductive material therein, the inner cover 52 functions as a shielded case, and high frequency signals or the like from a noise source near the power supply device reach and malfunction in the power supply circuit covered by the inner cover 52. prevent. The upper wall 52U receives water invaded from the joint surface 54 to the upper right of the right middle part 8a and the left middle part 8b of the middle part 8 shown in FIG. Therefore, it is possible to prevent the power supply circuit in the inner cover 52 from flowing into the water penetrating from the joint surface 54. In addition, water penetrating from the joint surface 56 of the front part 4 and the middle part 8 or the joint surface 58 of the back part 6 and the middle part 8 passes through the tongue section portions 52a and 52b and the upper wall. It flows to the (52U) side. Therefore, it is possible to prevent the power circuit in the inner cover 52 from getting wet by water invading from the joint surface 56 or 58.

For example, Patent No. 3,235,777 discloses a cover having an upper wall 52U and side walls 52R, 52L. In this state, since the equivalent of the tongue sections 52a, 52b is not provided, the joint surface 56 It cannot cope with water invading from (58).

As shown in Fig. 11 (b), a plurality of, for example, two convex portions 60 protruding toward the front portion 4 side are formed at the upper portion of the contact surface with the front portion 4 of the intermediate portion 8. It is. These convex parts 60 are provided in the right end part of the right middle part 8a and the left middle part 8b, as shown to the same figure (a). The middle part 8 and the front part 4 in the up-down direction In the state in which there is no contact between the convex portions, the convex portions 60 and 60 are provided at both side outer ends of the upper surface of the side of the middle portion 8 of the front surface portion 4 so that the convex portions 60 and 60 penetrate and come into contact with each other. Concave portions 62 and 62 are formed in correspondence with 60 and 60. Similarly, convex portions protruding toward the rear portion 6 at upper and outer sides of the contact surface with the rear portion 6 of the middle portion 8. (64, 64) are formed. In addition, although not shown in the drawing, the convex portions (64, 64) invade in a state where the intermediate portion (8) and the rear portion (6) are brought into contact with each other in a vertically displaced manner. Two grooves are formed in the surface on the side of the middle portion 8 of the rear portion 6 so as to contact each other.

In this way, the convex portions 60 and 60 are brought into contact with the concave portions 62 and 62 on the front part 4 side, and the convex portions 64 and 64 are brought into contact with two grooves on the rear part 6 side. For example, even if the user grasps the handle 9 and lifts the case 2, the front part 4 and the middle part 8 do not deviate in the vertical direction, and the middle part 8 and the back part 6 are similar in the vertical direction. Do not miss.

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If such a convex portion or a concave portion is not provided, when the handle 9 is held by a person and the case 2 is lifted, a relatively heavy weight such as a power supply circuit exists in the intermediate portion 8, whereas the front portion ( 4) Since no heavy weight exists in the rear part 6, the deviation | deviation to the up-down direction arises between the front part 4 and the intermediate part 8, and between the back part 6 and the intermediate part 8, respectively. However, by providing the convex portions 60, 60, the concave portions 62, 62, etc., such a deviation can be prevented from occurring.

In the above embodiment, the shaft 14 and the convex portion 22 are provided in the cover 14 and the shaft hole 24 and the circular hole 26 are provided on the concave portion 10 side. The shaft hole 24 and the circular hole 26 may be provided in 14, and the shaft 20 and the convex part 22 may be provided in the recessed part 10 side. In addition, although the convex part 22 was provided in multiple numbers, you may provide the at least 1 convex part 22. In addition, although the 1st clamp part 40a and the 2nd clamp part 40b were fixed by the bolt in embodiment mentioned above, it is not limited to this, For example, the hole which provided the fastener which has a hook in both ends, and engaged with these hooks is provided. It can be provided in the 1st and 2nd clamp part 40a, 40b. Moreover, although the tongue piece 52c, 52d was provided in the inner cover 52 in the said embodiment, it is not necessary in some cases. In addition, in the said embodiment, although the convex parts 60 and 64 were provided in the intermediate part 8 side, and the recessed part was provided in the front part 4 and the back part 6 side, in contrast, the intermediate part 8 side The concave part may be provided in the convex part, and the convex part may be provided in the front part 4 and the back part 6 side. In addition, in the above embodiment, the middle portion 8 is composed of right and left middle portions 8a and 8b, but can also be formed in a parallel rectangular parallelepiped form in which the inside of the intermediate portion is hollowed out and the front and back sides are opened. ．

 As described above, according to the present invention, since the cover can be fixed at a desired angle with respect to the panel, the operator on the panel can be operated without supporting the cover by hand. Therefore, the setting operation of the operator can be performed efficiently. In addition, when the first clamp unit is integrally installed with the case, the clamping operation of the cable can be easily performed. If the tongue extends beyond the joint surface, the power circuit will not get wet even if water intrudes from the joint surface of the front and middle sections or the joint surface of the middle and back sections. In the case where the convex part is provided on the other side of the contact surface of the front part and the middle part, and the convex part is provided on the other side of the contact surface of the back part and the intermediate part, the front part and the intermediate part are A shift does not occur between them, and a shift does not occur between the middle part and the back part.

Claims (7)

With a case (2), An operation panel 12 mounted on the case 2 and having a plurality of operators; An openable cover 14 disposed on the operation panel 12, At least one of the operators is an externally operated operator that is accessible from the outside of the cover 14 in a state in which the cover 14 covers the operation panel 12, The externally operated operator enters the parameter setting mode when it is activated, And the parameter is set by rotating or sliding the externally operated operator. The method of claim 1, The power supply device operates selectively among a plurality of operating modes, And a power supply device for setting the parameters of each of the operation modes. delete With the case (2), An operation panel 12 disposed in a part of the case 2 and having a plurality of operators for setting characteristics of a power supply circuit; At least a part of both sides contacting the case 2 in the state of covering the operation panel 12 and mounted to the case 2 so as to be free to rotate around an axis perpendicular to the both sides at this contact portion. With cover 14, At least one convex portion located on one side of the case 2 and the cover 14 on a circumference about the axis; In the other side of the said case 2 and the cover 14, the said convex part is provided with the some recessed part which can invade, The convex portion penetrates into one concave portion while the cover 14 covers the operation panel 12, and the cover 14 moves in the direction of opening the operation panel 12. The power supply device provided with each said recessed part so that the recessed part which intruded may invade in order. The method of claim 4, wherein A cable introduced through the inlet provided in the case 2 from the outside of the case 2 to the inside; A first clamp portion 40a formed integrally with the case 2 and surrounding half of the outer circumferential direction of the cable; A power source further comprising a second clamp portion 40b mounted to the first clamp portion 40a to surround the other half of the cable and surround the entire outer circumference of the cable together with the first clamp portion 40a. Device. The method of claim 4, wherein The case 2 is located between the front part 4 and the back part 6 which are arranged to face each other at intervals, and is located between the front part 4 and the back part 6 and the front part 4 and the back part. And an intermediate portion 8 in contact with the front portion 4 and the back portion 6 for connecting 6, The power supply further has a sheet disposed in the intermediate portion 8 to cover the component for the power circuit in the intermediate portion 8, The sheet has a first flap that extends from the upper portion thereof to the inside of the front portion 4 beyond the contact surface of the front portion 4 and the intermediate portion 8, and from the top of the sheet. And a second tongue extending beyond the contact surface between the portion (8) and the back portion (6) into the back portion (6). The method of claim 4, wherein The case 2 is located between the front part 4 and the back part 6 which are arranged to face each other at intervals, and is located between the front part 4 and the back part 6 and the front part 4 and the back part. An intermediate portion 8 having a cross section for contacting end surfaces of the front portion 4 and the back portion 6 to connect (6), The power supply further comprises contacting the front part 4 and the intermediate part 8 in one of the rear end faces of the front part 4 and the front end face of the intermediate part 8 which are in contact with each other. A first protrusion projecting toward the other cross section, A first concave portion provided in the other end surface in contact with the front portion 4 and the intermediate portion 8 and in which the first protrusion portion penetrates; A second protrusion projecting toward the other end face of the rear part 6 and the middle part 8 from one of the front end face of the rear part 6 and the rear end face of the middle part 8 in contact with each other; , And a second concave portion provided at the other end face in contact with the rear portion (6) and the intermediate portion (8) and into which the second protrusion is intruded.

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