Metal detection machine

Abstract

To provide a metal detection machine having a configuration for preventing mixture of a metal foreign matter into a manufacturing / inspection line.SOLUTION: A metal detection machine (1) includes: a sensor box (11); a belt conveyor (13); and a box-like control box (14) that is disposed on the sensor box (11) and has an operation display section (18). The control box (14) is divided into an upper case (21) and a body case (22) by sliding in a slide direction (B) orthogonal to a conveyance direction (A), a first side (224) and a second side (225) located in a slide direction (B) of the body case (22) have a jaw section (31) facing the operation display section (18), and a first side surface (211) and a second side surface (212) located in the slide direction (B) of the upper case (21) have an engagement hole (41). Accordingly, the control box (14) can prevent screws from falling below the control box (14) since there are no casing-fixing screws on a surface facing the conveyance direction (A).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a metal detector for detecting the presence or absence of metal in an object to be inspected. [Background technology]

[0002] A metal detector is a device that detects metallic foreign matter mixed in an object to be inspected by transporting the object to be inspected on a conveyer belt inside a sensor box that generates a magnetic field and detecting magnetic changes inside the sensor box caused by the object to be inspected. For this reason, as shown in Fig. 13, the metal detector is configured such that a sensor box 101 is shaped like a tunnel, and a conveyer belt 103 passes through a tunnel 102. In addition, a control box 104 equipped with an operation display unit of the metal detector and control circuits for the magnetic sensor and the conveyer belt is disposed above the sensor box 101 (see also Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-147275 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the control box 104 has a housing fixing screw 105 provided on the side facing the belt conveyor 103 as shown in FIG. 13, if the screw 105 comes loose for some reason and falls onto the belt conveyor 103 (on the line), this could cause problems such as foreign matter being mixed in or erroneous detection.

[0005] The present invention has been made in consideration of the above circumstances, and has an object to provide a metal detector having a configuration that prevents metallic foreign matter from entering production and inspection lines. [Means for solving the problem]

[0006] In order to solve the above problems, a first aspect of the metal detector of the present invention comprises a sensor box that performs inspection on an object to be inspected, a belt conveyor that passes through the sensor box and transports the object to be inspected in a transport direction, and a box-shaped control box that is arranged on top of the sensor box and has an operation display unit, wherein the control box is divided into an upper case and a body case by sliding in a sliding direction that is a direction perpendicular to the transport direction, and a first side and a second side in the sliding direction of a bottom plate of the body case that forms the bottom surface of the control box have claw portions that face toward the operation display unit, and a first side and a second side in the sliding direction of the upper case that form sides that surround the bottom surface of the control box have engagement holes for the claw portions at their respective lower ends.

[0007] In the metal detector of the second aspect, in the first aspect, it is also preferable that the claw portion is formed by punching the shape of the claw portion from the bottom plate of the body case and bending it up from the bottom plate.

[0008] In the metal detector of the third aspect, in the second aspect, it is also preferable that the bent portion forming the claw portion is provided with a slide guide portion one step lower than the claw portion and on the operation display unit side of the claw portion.

[0009] In the metal detector of the fourth aspect, in any of the first to third aspects, it is also preferable that the engagement hole is formed in a flat portion formed by bending the lower end portions of the first side surface and the second side surface of the upper case inwardly into an L shape.

[0010] In the metal detector of the fifth aspect, in the fourth aspect, it is also preferable that the claw portions and the engagement holes are formed in a plurality in the sliding direction, and the flat portions of the engagement holes are formed so as to be continuous.

[0011] In the metal detector of the sixth aspect, in any of the first to fifth aspects, it is also preferable that the console of the operation and display unit is provided with an L-shaped bracket, one first bracket is inserted into and supported in a notch of a support part provided in the body case, and the other second bracket is provided with the operation and display unit and fixed to the upper case.

[0012] In the seventh aspect of the metal detector, in the sixth aspect, it is also preferable that the notch is formed at the end of an insertion groove provided in the support part, the insertion groove slopes downward in the insertion direction, the entrance of the insertion groove is wider than the notch and open downward, and a downward-protruding locking part is formed above the entrance. Effect of the Invention

[0013] According to the present invention, it is possible to provide a metal detector having a configuration for preventing the intrusion of metallic foreign matter into a production / inspection line. [Brief description of the drawings]

[0014] [Figure 1] 1 is a front perspective view of a metal detector according to an embodiment of the present invention; [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. 1 shows the upper case, (A) a bottom view, and (B) a bottom perspective view. [Diagram 5] 11A and 11B are diagrams illustrating engagement between the upper case and the body case. [Figure 6] 1A is a front view of the control box 14, (B) is a rear view, (C) is a left side view, and (D) is a right side view. [Figure 7] 13 is a comparative example of the shape of the flat portion. [Figure 8] FIG. 11 is a right side view of the console and support of the operation and display unit in the metal detector according to the modified example. [Figure 9] 13A and 13B are views relating to a modified example, in which FIG. 13A is a right side view of a support portion, and FIG. 13B is a plan view of a first bracket of the console. [Figure 10] 11A and 11B are diagrams illustrating engagement between the console and the support portion. [Figure 11] 13 is a comparative example of the shape of the support portion. [Figure 12] 13A and 13B are diagrams illustrating interference between the console and the support portion when the upper case is slid. [Figure 13] FIG. 1 is a front perspective view of a conventional metal detector. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Next, preferred embodiments of the present invention will be described with reference to the drawings. In this specification, the directions of front, back, left, right, top and bottom are as shown in the drawings.

[0016] Fig. 1 is a front perspective view of a metal detector 1 according to an embodiment. Metal detector 1 is disposed in a part of a conveying path (line) of an entire manufacturing or inspection system (not shown). For example, an object to be inspected is conveyed from the upstream of the line, and metal detector 1 detects the presence or absence of metallic foreign matter mixed in the object to be inspected. Items that pass the inspection are sent to the downstream of the line, and items that are found to be abnormal during the inspection are discharged onto a line-out conveyor (not shown).

[0017] The metal detector 1 includes a sensor box 11, a belt conveyor 13 that passes through a tunnel 12 provided in the sensor box 11, a control box 14 fixed on top of the sensor box 11, and a stand 15 on which the sensor box 11 and the belt conveyor 13 are mounted. The sensor box 11 includes a magnetic sensor (not shown) around the tunnel 12. The belt conveyor 13 includes a drive pulley and a driven pulley (neither of which are shown), and sends the object to be inspected in a conveying direction A by a motor 16.

[0018] The control box 14 is box-shaped and contains electrical equipment 17 (see FIG. 2, which will be described later). The control box 14 is provided with a touch panel type operation display unit 18 on the front side of the device.

[0019] 2 is an exploded perspective view of the control box 14. The control box 14 is a box having a substantially rectangular parallelepiped shape and made up of an upper case 21 and a body case 22, and is disposed with its long side aligned in a direction B perpendicular to the conveying direction A.

[0020] The body case 22 is made of a metal plate and includes a bottom plate 221 and a rear plate 222 formed by bending the rear of the bottom plate 221, forming the bottom and rear surface of the control box 14. The bottom plate 221 is provided with screw holes for fixing the electrical components 17 including the above-mentioned magnetic sensor and control circuits for the motor 16, and screw holes for fixing the control box 14 to the sensor box 11. A power switch 20 (see FIG. 1) is attached to a right plate 223 behind the bottom plate 221.

[0021] The upper case 21 is made of a metal plate, is box-shaped and opens downward and backward, and has a first side surface 211 and a second side surface 212 surrounding a bottom plate 221 of the body case 22, a top surface 213, and a front surface 214. A window portion 23 is formed in the front surface 214 so that the operation display unit 18 can be seen through.

[0022] The console 19 of the operation display unit 18 is supported by a support portion 24 provided in front of the body case 22, and is fixed to a display unit screw hole 25 on the front surface 214 of the upper case 21. The window portion 23 is protected by a decorative panel 26. At the rear opening of the upper case 21, an abutment portion 227 (see FIG. 4(B) described later) for contacting the rear plate 222 of the body case 22 is formed by extending part of the periphery of the first side surface 211, the second side surface 212, and the top surface 213 of the upper case 21 and bending them inward in an L shape.

[0023] For maintenance purposes, the upper case 21 and the body case 22 are disengaged and separated into two pieces by sliding the upper case 21 in a direction B (hereinafter, this direction is referred to as the "slide direction B") perpendicular to the conveying direction A. Details are described below.

[0024] 3 is a top perspective view of the body case 22. A pair of left and right sides of the bottom plate 221 parallel to the sliding direction B, a first side 224 on the left side and a second side 225 on the right side, are formed with claws 31 facing the front direction of the device. Furthermore, a rectangular slide guide part 32 is formed on the front direction of the claw part 31, forming a flat side one step lower than the claw part 31 and one step higher than the bottom plate 221. The claws 31 and the slide guide part 32 are formed by punching out the shape from the left and right end regions of the bottom plate 221, bending the periphery of the bottom plate 221 downward at a right angle, and bending and raising the bottom plate 221 vertically upward. The bent parts 33 are formed at two locations spaced apart from each other in the approximate center regions of the first side 224 and the second side 225.

[0025] FIG. 4 is a diagram of the upper case 21, FIG. 4(A) is a bottom view, and FIG. 4(B) is a bottom perspective view seen from the rear. An engagement hole 41 is formed at the lower end of each of a pair of left and right side surfaces of the upper case 21 that are parallel to the sliding direction B, the first side surface 211 on the left side and the second side surface 212 on the right side. The engagement hole 41 is formed at two locations spaced apart on each of the first side surface 211 and the second side surface 212 in correspondence with the positions of the respective claw portions 31. On each of the first side surface 211 and the second side surface 212, the engagement holes 41, 41 are formed in a flat portion 42 that continues in the sliding direction B. The flat portion 42 is formed by extending the lower end portions of the approximately central regions of the first side surface 211 and the second side surface 212 and bending them inward in an L-shape. As a result, the flat portion 42 is formed in a position that is continuous between the engagement holes 41, 41 and one step higher than the lower ends of the first side surface 211 and the second side surface 212.

[0026] The engagement hole 41 is formed such that a front region 43 on the device front side (the direction in which the operation display unit 18 is located) has a narrower hole width than a rear region 44 on the device rear side, and the hole width of the front region 43 is formed to correspond to the plate thickness of the claw portion 31 of the lower case 22. In addition, an inclined portion 45 is formed at the boundary between the front region 43 and the rear region 44. The engagement hole 41 is formed by punching out these shapes from the flat portion 42.

[0027] The engagement between the body case 22 (claw portion 31) and the upper case 21 (engagement hole 41) will be described. FIG. 5 is a diagram for explaining the engagement between the upper case 21 and the body case 22. To engage the upper case 21 and the body case 22, the upper case 21 is placed over the body case 22 from the front and slid backward. When the upper case 21 is placed over the body case 22 from the front, the flat portion 42 of the upper case 21 rests on the claw portion 31 of the body case 22 as shown in FIG. 5(A). When the upper case 21 is slid backward and the claw portion 31 passes through the engagement hole 41, the flat portion 42 of the upper case 21 rests on the slide guide portion 32 of the body case 22 as shown in FIG. 5(B). When the upper case 21 is further slid backward, the claw portion 31 engages with the front region 43 of the engagement hole 41 and is locked as shown in FIG. 5(C). At this time, the slide guide portion 32 functions as a guide for guiding the claw portion 31 to the front region 43 in FIG. 5B, and the inclined portion 45 of the engagement hole 41 functions as a guide for guiding the claw portion 31 to the front region 43 in FIG.

[0028] To release the engagement between the body case 22 (claw portion 31) and the upper case 21 (engagement hole 41), the upper case 21 is slid forward relative to the body case 22 and lifted up. This results in the state shown in FIG. 5B, where the engagement between the claw portion 31 and the front region 43 of the engagement hole 41 is released, and the claw portion 31 can be removed from the rear region 44 of the engagement hole 41.

[0029] 6 is a four-sided view of the control box 14, (A) a front view, (B) a rear view, (C) a left side view, and (D) a right side view. In the control box 14, the body case 22 (claw portion 31) and the upper case 21 (engagement hole 41) are slidably engaged to assemble the control box 14 as described above. In order to prevent wobbling, the abutment portion 227 (see FIG. 4(B)) of the rear opening of the upper case 21 is screwed to the rear plate 222 of the body case 22 at two points, left and right (see the dashed circle in FIG. 6(B)), and the front surface 214 of the upper case 21 is screwed to the decorative panel 26 at four points, top, bottom, left and right (see the dashed circle in FIG. 6(A)). As a result, the control box 14 does not have any housing screws for fastening the housing of the control box 14 on the left and right side surfaces 211, 212 (see FIGS. 6(C) and (D)).

[0030] As described above, according to the metal detector 1 of this embodiment, the control box 14 is assembled by sliding engagement between the body case 22 (claw portion 31) and the upper case 21 (engagement hole 41), so that there are no housing screws of the control box 14 on the left and right side surfaces 211, 212 of the control box 14 facing the conveying direction A. The housing screws of the control box 14 of this embodiment are only arranged on the front and rear surfaces 214, 222 of the control box 14 facing the direction B perpendicular to the conveying direction A of the belt conveyor 13, so that even if a housing screw should come loose, the probability of the screw falling onto the line can be kept significantly low.

[0031] In the metal detector 1 of this embodiment, the body case 22 (claw portion 31) and the upper case 21 (engagement hole 41) engage at two points in the sliding direction B, but the engagement points may be modified to one point in the sliding direction B, or to more than two points. Even with these modifications, the same effect as described above can be obtained, that is, since there is no need to provide a housing screw on the side surface of the control box 14 facing the conveying direction A, it is possible to prevent metallic foreign matter from being mixed into the line.

[0032] However, as in the metal detector 1 of this embodiment, it is preferable to provide a plurality of engagement points between the claw portion 31 and the engagement hole 41 in the sliding direction B, and to make the flat portions 42 of the engagement holes 41, 41 continuous, so that the upper case 21 can be prevented from falling down when the control box 14 is assembled. In the metal detector 1 of this embodiment, the engagement holes 41 are provided at two locations in the sliding direction B, and the flat portions 42 of the engagement holes 41, 41 are continuous, so that when the control box 14 is assembled, as shown in (A) of FIG. 5, the flat portion 42 of the upper case 21 once rests on the claw portion 31 of the body case 22 and interferes with it. Therefore, the flat portion 42 prevents the upper case 21 from falling down until the upper case 21 is in the appropriate position and the claw portion 31 passes through the engagement hole 41. In contrast, FIG. 7 shows a comparative example in which the flat portions 42 of the engagement holes 41, 41 are not continuous. If the flat surface portions 42 are not continuous, as shown in FIG. 7, even if the claw portions 31 are not fitted into the engagement holes 41, the flat surface portions 42 do not interfere, and the upper case 21 may fall all the way down. In this case, there is a risk that the operator may get his or her fingers caught in the case, or that the upper case 21 may not slide properly and the control box 14 may not close. There is also a risk that the electrical equipment 17 designed to be housed therein may come into contact with the upper surface 213, damaging the electrical components. According to the metal detector 1 of this embodiment, the above-mentioned problems can be prevented by providing a plurality of engagement holes 41, 41 in the sliding direction B and making the flat surface portions 42 continuous.

[0033] Next, preferred modifications of the above-described embodiment will be given. The same components as those in the embodiment will be given the same reference numerals and the description thereof will be omitted.

[0034] 8 is a right side view of the console 19 of the operation and display unit 18 according to the modified example and the support part 24 provided on the body case 22. In the control box 14 of the metal detector 1, the console 19 including the operation and display unit 18 and its control circuit is configured to be removable from the upper case 21 for ease of maintenance. The console 19 of the operation and display unit 18 includes an L-shaped metal bracket (hereinafter referred to as an L-shaped bracket) 51, with a first bracket 511 on the short side supported by the support part 24 and the operation and display unit 18 fixed to a second bracket 512 on the long side, which is then screwed into the display unit screw hole 25 (see FIG. 2) on the front surface 214 of the upper case 21.

[0035] 2, the support portion 24 is formed such that receiving plates 241, 241 of the same shape are arranged on the bottom plate 221 of the body case 22 in a plane parallel to the slide direction B and spaced apart in the transport direction A, and is formed, for example, by bending a metal plate having the shape of the receiving plate 241 formed at both ends into a U-shape and fixing the center portion to the bottom plate 221 with a screw. As shown in FIG. 8, the receiving plate 241 is formed with an insertion groove 242 that slopes downward from the front direction of the device (the direction in which the operation display unit 18 is located) toward the rear direction of the device, and the first bracket 511 of the console 19 is inserted into the insertion groove 242 from the front side (hereinafter, the direction C in which the first bracket 511 is inserted into the insertion groove 242 is referred to as the "insertion direction").

[0036] Fig. 9(A) is a right side view of the support part 24 according to the modified example, and Fig. 9(B) is a plan view of the first bracket 511 of the console 19 according to the modified example. As shown in Fig. 9(A), the insertion groove 242 is inclined downward toward the insertion direction C, and a notch 243 equivalent to the plate thickness of the first bracket 511 is formed at the end of the insertion groove 242. An entrance 244 of the insertion groove 242 is formed in a shape that is one step lower and wider than the notch 243, and a locking part 245 is formed protruding downward above the entrance 244 of the insertion groove 242 with a slight distance from the notch 243. A second notch 247 equivalent to the plate thickness of the first bracket 511 is formed at the front end of the locking part 245.

[0037] 9(B), a short groove 513 that interferes with the notch 243 and a long groove 514 that interferes with the locking portion 245 are formed in the first bracket 511 of the console 19 at positions corresponding to the receiving plate 241 of the support portion 24. The short groove 513 is formed on the end face of the first bracket 511 on the insertion direction C side, and the long groove 514 is formed on the inside of the short groove 513.

[0038] The following describes the process from the engagement of the console 19 (first bracket 511) of the operation display unit 18 with the support unit 24 (notch 243) to the assembly of the control box 14. To engage the console 19 with the support unit 24, (ai) the first bracket 511 is inserted below the locking portion 245 from the entrance 244 of the insertion groove 242, the locking portion 245 is aligned with the long groove 514, and the bracket 511 is slid in the insertion direction C while being lifted slightly upward. Then, (aii) the short groove 513 of the first bracket 511 is inserted into the notch 243 for primary interference, and the front region of the long groove 514 is inserted into the second notch 247 of the locking portion 245 for secondary interference, so that the first bracket 511 is supported by the support unit 24 in a cantilevered manner (see FIG. 10). (aiii) In this state, the cables of the console 19 and the electrical equipment 17 are arranged and stored in the control box 14, (aiv) the upper case 21 is slid backward into engagement with the body case 22 (see FIG. 5), (av) the second bracket 512 is screwed into the screw hole 25 for the display unit on the front surface 214 of the upper case 21. Finally, (avi) the rear plate 222 of the upper case 21 and the body case 22 are screwed together (see FIG. 6(B)), and the front surface 214 of the upper case 21 and the decorative panel 26 are screwed together (see FIG. 6(A)).

[0039] The removal of the control box 14 and the disengagement of the console 19 from the support section 24 will be described. First, (bi) remove the screws on the front surface 214 of the upper case 21 and the decorative panel 26, and remove the screw on the screw hole 25 for the display section on the front surface 214 of the upper case 21, thereby releasing the fixation of the console 19 (bracket 51) and the upper case 21. (bii) Next, remove the screws on the rear panel 222 of the upper case 21 and the body case 22, thereby releasing the movement of the upper case 21 in the sliding direction B. (biii) Next, slide the upper case 21 to disengage it from the body case 22, and remove the upper case 21 from the body case 22. (biv) Next, to disengage the console 19 from the support section 24, slide the bracket 51 in the direction opposite to the insertion direction C while slightly lowering the position of the bracket 51, and pull out the bracket 51 from the support section 24. Then, (bv) the primary interference between the short groove 513 and the notch 243 is released, and the secondary interference between the front region of the long groove 514 and the second notch 247 is also released, allowing the first bracket 511 (console 19) to be pulled out of the insertion groove 242 (support portion 24).

[0040] Here, when removing the control box 14, if step (bi) above is forgotten and the fixing screws on the console 19 and the front surface 214 of the upper case 21 are not removed, and step (biii) above is performed to remove the upper case 21, the console 19 will remain fixed to the upper case 21, and the cable of the console 19 will be pulled together with the upper case 21, which may result in a disconnection.

[0041] To address this problem, Fig. 11 shows a comparative example of the shape of the receiving plate 241 of the support part 24. As a configuration in which the console 19 of the operation display unit 18 is inserted into the support part 24 and cantilevered, the insertion groove 242' of the support part 24' (receiving plate 241') may be linear in the sliding direction C. However, with this insertion groove 242', when the upper case 21 is slid forward in the above (biii), even if the above step (bi) (removing the fixing screw) is forgotten, the engagement between the upper case 21 and the body case 22 can be released, and as a result, the cable of the console 19 may be pulled with excessive force, which may result in the cable being broken.

[0042] On the other hand, according to the insertion groove 242 of the modified example, if one tries to slide the upper case 21 without removing the fixing screws on the console 19 and the front surface 214 of the upper case 21, the rear end surface of the locking portion 245 interferes with the rear region of the long groove 514 as shown in Fig. 12, and the console 19 (first bracket 511) cannot be pulled out from the support portion 24 (insertion groove 242). That is, in the insertion groove 242 of the modified example, the fixing screws on the console 19 and the front surface 214 of the upper case 21 must be removed to release the bracket 51 from its vertical movement and pass the first bracket 511 under the locking portion 245 before the console 19 can be pulled out from the support portion 24, and the upper case 21 connected to the console 19 cannot be slid (pulled out) from the body case 22, so that cable breakage of the console 19 due to a procedure error can be prevented.

[0043] In this modification, the console 19 and the support part 24 are engaged at two points in the transport direction A, but the engagement points may be one in the transport direction A, or more than two. Even with these modifications, the same effect as described above can be obtained, that is, the cable of the console 19 can be prevented from breaking when the upper case 21 is removed. Also, the second notch 47 of the locking part 245 is an optional configuration that is preferably provided to further stabilize the cantilever support of the support part 24.

[0044] Although the preferred embodiment and several modified examples of the present invention have been described above, these can be modified and combined based on the knowledge of those skilled in the art, and such forms are also included within the scope of the present invention. [Explanation of symbols]

[0045] 1...metal detector, 11...sensor box, 13...belt conveyor, 14...control box, 18...operation display unit, 19...console, 21...upper case, 211...first side (left), 212...second side (right), 22...body case, 224...first side (left), 225...second side (right), 24...support unit, 242...insertion groove, 243...notch, 244...entrance, 245...engagement unit, 247...second notch, 25...display unit screw hole, 31...claw portion, 32...slide guide portion, 33...bending portion, 41...engagement hole, 42...flat portion, 43...front region, 44...rear region, 45...inclined portion, 51...L-shaped bracket, 511...first bracket, 512...second bracket, 513...short groove, 514...long groove, A...transport direction, B...slide direction, C...insertion direction

Claims

1. a sensor box for inspecting an object to be inspected, a belt conveyor for conveying the object to be inspected in a conveying direction passing through the sensor box, and a box-shaped control box disposed above the sensor box and having an operation display unit; The control box is separated into an upper case and a body case by sliding in a sliding direction that is a direction perpendicular to the conveying direction, a first side and a second side in the sliding direction of a bottom plate of the body case that forms a bottom surface of the control box include tabs that face toward the operation display unit; A first side surface and a second side surface in the sliding direction of the upper case that form a side surface surrounding the bottom surface of the control box are provided with engagement holes for the claw portions at their lower ends. A metal detector comprising:

2. 2. The metal detector according to claim 1, wherein the claw portion is formed by punching a shape of the claw portion from the bottom plate of the body case and bending the claw portion up from the bottom plate.

3. 3. The metal detector according to claim 2, wherein the bent portion forming the claw portion includes a slide guide portion that is one step lower than the claw portion and is located closer to the operation display unit than the claw portion.

4. 2. The metal detector according to claim 1, wherein the engagement hole is formed in a flat portion formed by bending the lower ends of the first side and the second side of the upper case inward in an L-shape.

5. 5. The metal detector according to claim 4, wherein a plurality of the claws and the engagement holes are formed in the sliding direction, and the flat surfaces of the engagement holes are formed so as to be continuous.

6. The metal detector described in claim 1, characterized in that the console of the operation and display unit is equipped with an L-shaped bracket, one of which, a first bracket, is inserted into and supported by a notch in a support part provided on the body case, and the other of which, a second bracket, has the operation and display unit and is fixed to the upper case.

7. The notch is formed at the end of an insertion groove provided in the support portion, The insertion groove is inclined downward in the insertion direction, 7. The metal detector according to claim 6, wherein the entrance of the insertion groove is wider than the notch and is open downward, and a downwardly protruding engaging portion is formed above the entrance.

Images