阅读说明：本技术 图像形成系统、图像形成装置和图像读取装置 (Image forming system, image forming apparatus, and image reading apparatus ) 是由 守田拓朗 于 2019-09-06 设计创作，主要内容包括：图像形成系统(100)具备打印机(1)和扫描仪(50),打印机具备第1壳体(10)和固定部件(20),在第1壳体的顶板(13)上形成有第1开口部(11)和第2开口部(12)；固定部件(20)被配置于顶板(13)的下方,能以使第1突出部(21)从第1开口部(11)出没且使第2突出部(22)从第2开口部(12)出没的方式对固定部件进行操作；扫描仪具备：第2壳体(60),其被载置于第1壳体(10)；第2滑架(52),其能够在第2壳体(60)的内部移动；锁定部件(70),其通过与第2滑架(52)啮合来限制第2滑架(52)的移动,在被第1突出部(21)顶起的情况下与第2滑架(52)的啮合位置错开,解除对第2滑架(52)的移动限制；第3开口部(64),第2突出部(22)可嵌入其内。(An image forming system (100) is provided with a printer (1) and a scanner (50), wherein the printer is provided with a1 st housing (10) and a fixing component (20), and a1 st opening (11) and a2 nd opening (12) are formed on a top plate (13) of the 1 st housing; the fixing member (20) is arranged below the top plate (13) and can be operated in a mode that the 1 st protruding part (21) is exposed from the 1 st opening part (11) and the 2 nd protruding part (22) is exposed from the 2 nd opening part (12); the scanner includes: a2 nd case (60) mounted on the 1 st case (10); a2 nd carriage (52) movable inside a2 nd housing (60); a lock member (70) which restricts the movement of the 2 nd carriage (52) by engaging with the 2 nd carriage (52), and which releases the restriction on the movement of the 2 nd carriage (52) by being displaced from the engagement position of the 2 nd carriage (52) when pushed up by the 1 st projection (21); the 3 rd opening (64) into which the 2 nd protrusion (22) can be fitted.)

1. An image forming system is characterized in that,

the image forming apparatus includes an image forming apparatus and an image reading apparatus,

the image forming apparatus includes a1 st housing and a fixing member, wherein: a1 st opening and a2 nd opening are formed in a top plate of the 1 st housing; the fixing member is disposed below the top plate, includes a1 st protruding portion and a2 nd protruding portion, and is operable to allow the 1 st protruding portion to protrude from the 1 st opening and the 2 nd protruding portion to protrude from the 2 nd opening,

the image reading apparatus includes a2 nd housing, a moving frame, a lock member, and a 3 rd opening, wherein,

the 2 nd housing is mounted on the top plate of the 1 st housing;

the moving frame supports an optical system for guiding reflected light from the document to the image pickup device, and is movable inside the 2 nd housing;

the lock member restricts movement of the moving frame by engaging with the moving frame, and when the lock member is pushed up by the 1 st protruding portion protruding from the 1 st opening, the lock member and the moving frame are displaced from each other in the position of engagement, whereby restriction of movement of the moving frame is released;

the 3 rd opening portion is formed in a bottom plate of the 2 nd case for fitting therein the 2 nd protrusion portion protruding from the 2 nd opening portion.

2. The image forming system according to claim 1,

the fixing member is provided with a holding part,

the 1 st housing includes a connector arranged at a position covered by the grip portion, for outputting an image signal converted from the reflected light,

when the fixing member is projected from the 1 st opening by using the grip portion, the connector is exposed.

3. The image forming system according to claim 1,

the fixing member is rotatably supported by the 1 st housing, and is rotated to allow the 1 st protruding portion and the 2 nd protruding portion to protrude and retract through the 1 st opening and the 2 nd opening, respectively.

4. The image forming system according to claim 1,

a guide portion that guides movement of the 2 nd case in one direction along the upper surface of the top plate is formed on the upper surface of the top plate of the 1 st case and on the lower surface of the bottom plate of the 2 nd case.

5. The image forming system according to claim 4,

the guide portion formed on the upper surface of the top plate of the 1 st housing is a guide rail along one direction,

the guide portion formed on the lower surface of the bottom plate of the 2 nd housing is a groove engaging with the guide rail,

the 2 nd housing is guided to a predetermined position with respect to the 1 st housing by the guide portion, whereby the 1 st protruding portion and the 2 nd protruding portion are located below the locking member and the 3 rd opening portion, respectively.

6. The image forming system according to claim 1,

the locking member has a projection portion and a notch portion, wherein,

the protrusion engages with a hole formed in the moving frame;

the notch portion is engaged with a convex portion provided in the 2 nd housing to restrict downward movement of the lock member,

when the lock member is pushed up by the 1 st projection projecting from the 1 st opening, the projection is separated from the hole, and the engagement position of the lock member with the moving frame is shifted.

7. The image forming system according to claim 1,

the 1 st protrusion is an eccentric cam fixed to a shaft portion, and the 2 nd protrusion has a pin shape protruding in a radial direction from the shaft portion in a direction of a maximum diameter of the 1 st protrusion.

8. The image forming system according to claim 1,

the 2 nd protruding portion is fitted into the 3 rd opening portion, whereby the 2 nd housing is positioned with respect to the 1 st housing.

9. An image forming apparatus is characterized in that,

comprises a1 st shell and a fixed component, wherein,

a1 st opening and a2 nd opening are formed in a top plate of the 1 st housing;

the fixing member is disposed below the top plate, includes a1 st protruding portion and a2 nd protruding portion, and is operable such that the 1 st protruding portion protrudes from the 1 st opening portion and the 2 nd protruding portion protrudes from the 2 nd opening portion.

10. An image reading apparatus is characterized in that,

comprises a2 nd housing, a movable frame, a locking member and a 3 rd opening part, wherein,

the 2 nd housing is mounted on the top plate of the 1 st housing of the image forming apparatus;

the moving frame supports an optical system for guiding reflected light from the document to the image pickup device, and is movable inside the 2 nd housing;

the lock member restricts movement of the moving frame by engaging with the moving frame, and when the lock member is pushed up by a1 st projection portion projecting from a1 st opening portion of the top plate of the image forming apparatus, the lock member and the moving frame are displaced from each other in an engagement position, whereby restriction of movement of the moving frame is released;

the 3 rd opening is formed in a bottom plate of the 2 nd housing for fitting therein a2 nd protrusion protruding from the 2 nd opening of the top plate of the image forming apparatus.

Technical Field

The present invention relates to a technique of combining an image forming apparatus and an image reading apparatus.

Background

A multifunction machine (multifunction machine) is known which combines an image forming apparatus and an image reading apparatus and has a copy function, a facsimile function, and the like. As means for combining an image forming apparatus and an image reading apparatus, the following examples are known: a housing (housing) of the image reading apparatus is placed on a housing of the image forming apparatus, and the housings are coupled to each other by screws or the like. For example, patent document 1 describes providing a stand for adjusting a support height of a housing of an image reading apparatus coupled to an image forming apparatus. Patent document 2 describes that a housing of an image forming apparatus and a housing of an image reading apparatus are provided with a hook and a hole for engaging with the hook, and when the housing of the image reading apparatus is provided on the housing of the image forming apparatus, the housing of the image reading apparatus is slid to engage the hook with the hole, thereby coupling the image forming apparatus and the image reading apparatus.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2005-123777

Patent document 2: japanese patent laid-open publication No. 2003-209647

Disclosure of Invention

[ problem to be solved by the invention ]

However, in both of the contents described in patent documents 1 and 2, it is assumed that a product in which an image forming apparatus and an image reading apparatus are integrated is provided to a user, and a complicated operation is required when the user purchases the image forming apparatus and the image reading apparatus separately and wants to combine them after that. Further, there is a possibility that a moving frame of an optical system in the image reading apparatus may be damaged by an impact when the image reading apparatus is combined with the image forming apparatus.

In view of the above, an object of the present invention is to provide an image forming system, an image forming apparatus, and an image reading apparatus, which can easily couple the image forming apparatus and the image reading apparatus and can prevent damage to a moving housing of an optical system of the image reading apparatus.

[ solution for solving problems ]

In order to solve the above-described problems, an image forming system according to the present invention includes an image forming apparatus and an image reading apparatus, wherein the image forming apparatus includes a1 st housing and a fixing member, and wherein: a1 st opening and a2 nd opening are formed in a top plate of the 1 st housing; the fixing member is disposed below the top plate, and includes a1 st protruding portion and a2 nd protruding portion, and the fixing member is operable such that the 1 st protruding portion is exposed (extended or retracted) from the 1 st opening portion and the 2 nd protruding portion is exposed from the 2 nd opening portion, and the image reading apparatus includes a2 nd housing, a moving frame, a lock member, and a 3 rd opening portion, wherein the 2 nd housing is mounted on the top plate of the 1 st housing; the moving frame supports an optical system for guiding reflected light from the document to the image pickup device, and is movable inside the 2 nd housing; the lock member restricts movement of the moving frame by engaging with the moving frame, and when the lock member is pushed up by the 1 st protruding portion protruding from the 1 st opening, the lock member and the moving frame are displaced from each other in the position of engagement, whereby restriction of movement of the moving frame is released; the 3 rd opening portion is formed in a bottom plate of the 2 nd case for fitting therein the 2 nd protrusion portion protruding from the 2 nd opening portion.

An image forming apparatus according to the present invention includes a1 st housing and a fixing member, wherein a1 st opening and a2 nd opening are formed in a top plate of the 1 st housing; the fixing member is disposed below the top plate, includes a1 st protruding portion and a2 nd protruding portion, and is operable such that the 1 st protruding portion protrudes from the 1 st opening portion and the 2 nd protruding portion protrudes from the 2 nd opening portion.

An image reading apparatus according to the present invention includes a2 nd housing, a moving frame, a lock member, and a 3 rd opening, wherein the 2 nd housing is mounted on a top plate of a1 st housing of an image forming apparatus; the moving frame supports an optical system for guiding reflected light from the document to the image pickup device, and is movable inside the 2 nd housing; the lock member restricts movement of the moving frame by engaging with the moving frame, and when the lock member is pushed up by a1 st projection portion projecting from a1 st opening portion of the top plate of the image forming apparatus, the lock member and the moving frame are displaced from each other in an engagement position, whereby restriction of movement of the moving frame is released; the 3 rd opening is formed in a bottom plate of the 2 nd housing for fitting therein a2 nd protrusion protruding from the 2 nd opening of the top plate of the image forming apparatus.

[ Effect of the invention ]

According to the present invention, the image forming apparatus and the image reading apparatus can be easily combined, and the damage of the moving frame of the optical system of the image reading apparatus can be prevented.

Drawings

Fig. 1 is a front view schematically showing an internal configuration of a color printer according to an embodiment of the present invention.

Fig. 2A is a perspective view of a printer according to an embodiment of the present invention.

Fig. 2B is a perspective view of a fixing member according to an embodiment of the present invention.

Fig. 3A is a perspective view of a scanner according to an embodiment of the present invention.

Fig. 3B is a perspective view of the lock member according to the embodiment of the present invention.

Fig. 3C is a perspective view of the lock member according to the embodiment of the present invention.

Fig. 4A is a diagram showing a state in which the scanner according to the embodiment of the present invention is moving.

Fig. 4B is a diagram showing a state after completion of movement of the scanner according to the embodiment of the present invention.

Fig. 4C is a diagram showing a state in which the scanner according to the embodiment of the present invention is incorporated in the printer.

Fig. 5A is a diagram showing a state before the scanner according to the embodiment of the present invention is coupled.

Fig. 5B is a diagram showing a state in which the scanners according to the embodiment of the present invention are combined.

Fig. 6A is a perspective view of a printer according to a modification of the embodiment of the present invention.

Fig. 6B is a perspective view of a fixing member according to a modification of the embodiment of the present invention.

Detailed Description

Next, an image forming system 100 according to an embodiment of the present invention will be described with reference to the drawings. The image forming system 100 includes a printer 1 (an example of an image forming apparatus) and a scanner 50 (an example of an image reading apparatus).

First, the overall structure of the printer 1 and the scanner 50 is explained with reference to fig. 1. Fig. 1 is a front view schematically showing the internal configuration of the printer 1 and the scanner 50. Although fig. 1 shows a state in which the printer 1 and the scanner 50 are combined, the printer 1 and the scanner 50 may be operated separately from each other without combining them. Next, the front side of the paper in fig. 1 is referred to as the front side (front side) of the printer 1 and the scanner 50, and the left-right direction is described with reference to the direction in which the printer 1 and the scanner 50 are viewed from the front. In each figure, U, Lo, L, R, Fr, Rr represent up, down, left, right, front, and rear, respectively.

The printer 1 includes a paper feeding device 3, an image forming unit 4, a fixing device 5, and a discharge unit 7, wherein the paper feeding device 3 feeds a sheet S stored therein to a conveyance path 6; the image forming portion 4 forms a full-color toner image on the sheet S by an electrophotographic method; the fixing device 5 fixes the toner image to the sheet S; the sheet S after the toner image is fixed is discharged to the discharge portion 7.

When the printer 1 receives image data from an external computer or the like, the sheet S is sent out from the paper feeding device 3 to the conveyance path 6, and a toner image is formed on the sheet S by the image forming portion 4, and the toner image is fixed on the sheet S by the fixing device 5, after which the sheet S is discharged to the discharge portion 7.

The scanner 50 includes a1 st carriage 51, a2 nd carriage 52 (an example of a moving frame), a lens 53, an image pickup device 54, a platen glass 55, and a platen (not shown), wherein the 1 st carriage 51 includes a light source and a mirror; the 2 nd carriage 52 includes two mirrors; the lens 53 images the reflected light; the imaging element 54 converts the imaged reflected light into an image signal; the platen glass 55 is used for arranging an original; the platen presses the original on the platen glass 55.

When a reading instruction is given to the scanner 50, the 2 nd carriage 52 moves to the right at a speed V/2 in conjunction with the movement of the 1 st carriage 51 to the right at the speed V. The reflected light reflected by the original is reflected by the mirror of the 1 st carriage 51 and the mirror of the 2 nd carriage 52, guided to the lens 53, imaged in the imaging element 54, and converted into an image signal. The converted image signal is output to the printer 1, and converted into image data.

Next, a structure for combining the printer 1 and the scanner 50 will be described with reference to fig. 1 to 3B. Fig. 2A is a perspective view of the printer 1. Fig. 2B is a perspective view of the fixing member 20. Fig. 3A is a perspective view of the scanner 50. Fig. 3B and 3C are perspective views of the lock member 70.

The printer 1 comprises a1 st housing 10 and a fixing member 20, wherein a1 st opening 11 and a2 nd opening 12 are formed on a top plate 13 of the 1 st housing 10; the fixing member 20 is disposed below the top plate 13. The scanner 50 includes a2 nd housing 60, a lock member 70, and a 3 rd opening 64, wherein the 2 nd housing 60 is mounted on the top plate 13 of the 1 st housing 10; the lock member 70 restricts the movement of the 2 nd carriage 52 by engaging with the 2 nd carriage 52; the 3 rd opening 64 is formed in a bottom plate 65 of the 2 nd case 60.

As shown in fig. 2A, the 1 st housing 10 of the printer 1 is formed in a rectangular parallelepiped shape, and a1 st opening 11 and two 2 nd openings 12 are formed in a top plate 13. The 1 st opening 11 is a rectangular hole having a longitudinal direction in the front-rear direction, and is formed near the left end of the top plate 13. The two 2 nd openings 12 are rectangular holes having a longitudinal direction in the front-rear direction, and are formed on the right side of the 1 st opening 11 and near the right end of the top plate 13. A hole 15 is formed in the right side plate 14. A hole 17 is formed in the left side plate 16.

As shown in fig. 2B, the fixing member 20 includes a shaft portion 23 having a longitudinal direction in the left-right direction, and is disposed below the top plate 13. A boss 24 is formed at the right end of the shaft 23. The boss 24 is supported by the hole 15 of the right side plate 14 of the 1 st case 10. A grip portion 25 is formed at the left end of the shaft portion 23. The left end of the shaft 23 penetrates the hole 17 of the left side plate 16 of the 1 st case 10, and the grip 25 is disposed on the outer surface side of the left side plate 16 of the 1 st case 10.

The fixing member 20 includes a1 st projection 21 and a2 nd projection 22. The 1 st projection 21 is an eccentric cam, and the 2 nd projection 22 is formed in a pin shape projecting from the shaft portion 23 in a direction in which the diameter of the 1 st projection 21 is largest. The 1 st and 2 nd protrusions 21 and 22 are formed at positions corresponding to the 1 st and 2 nd openings 11 and 12, respectively. The fixing member 20 is operated so that the 1 st protruding portion 21 is protruded from and retracted from the 1 st opening 11 and the 2 nd protruding portion 22 is protruded from and retracted from the 2 nd opening 12. Specifically, when the grip 25 is operated in the counterclockwise direction, the 1 st protruding portion 21 protrudes from the 1 st opening 11 and the 2 nd protruding portion 22 protrudes from the 2 nd opening 12. When the grip 25 is operated clockwise from the state where the 1 st protruding portion 21 and the 2 nd protruding portion 22 protrude, the 1 st protruding portion 21 enters the 1 st opening 11 and the 2 nd protruding portion 22 enters the 2 nd opening 12.

Guide rails 18 (guide portions) having a longitudinal direction in the left-right direction are formed at both front and rear end portions of the upper surface of the top plate 13. A connector 30 is disposed on the outer surface of the left side plate 16 of the 1 st housing 10, and the connector 30 outputs an image signal converted from reflected light. The connector 30 is disposed at a position covered by the grip 25 when the 1 st and 2 nd protrusions 21 and 22 do not protrude from the 1 st and 2 nd openings 11 and 12, and the connector 30 is exposed when the 1 st and 2 nd protrusions 21 and 22 are protruded using the grip 25.

As shown in fig. 3A, the 2 nd housing 60 of the scanner 50 is formed in a rectangular parallelepiped shape, and a lock member 70 is disposed at a left end portion thereof. In fig. 3A, the left side surface of the lock member 70 is exposed for convenience of illustration, but in reality, as shown in fig. 4A, the left side surface of the lock member 70 is covered with the left side plate 61. As shown in fig. 3B and 3C, the lock member 70 is a rectangular parallelepiped member having a notch portion 71 formed at a lower end portion of a rear end portion. A recess 62 for accommodating the lock member 70 is formed in the left side plate 61 of the 2 nd housing 60. The dimension of the recess 62 in the up-down direction is larger than the dimension of the lock member 70 in the up-down direction. At a position corresponding to the notch portion 71 of the lock member 70 in the concave portion 62, a convex portion 63 for restricting downward movement of the lock member 70 is formed. When the convex portion 63 comes into contact with the notch portion 71, the top portion of the lock member 70 and the top portion of the concave portion 62 are separated, and the lock member 70 can slide upward. A hook-shaped protrusion 72 bent downward is formed on the right side surface of the lock member 70.

The 3 rd opening 64 is a rectangular hole having a longitudinal direction in the front-rear direction, and is formed in the bottom plate 65 at a position corresponding to the 2 nd opening 12 of the 1 st casing 10. The 2 nd projecting portion 22 of the fixing member 20 projecting from the 2 nd opening portion 12 of the 1 st case 10 is fitted into the 3 rd opening portion 64.

Grooves 66 (guide portions) having a longitudinal direction in the left-right direction are formed at both front and rear end portions of the lower surface of the bottom plate 65. The groove 66 is formed in a shape corresponding to the guide rail 18 of the 1 st housing 10. A connector 80 is disposed on the outer surface of the left side plate 61 of the 2 nd housing 60.

Next, a sequence in which the printer 1 and the scanner 50 are combined will be described with reference to fig. 4A to 5B.

First, as shown in fig. 4A, the user places the scanner 50 on the top plate 13 of the 1 st housing 10 of the printer 1. The user inserts the guide rail 18 of the 1 st housing 10 into the groove 66 of the 2 nd housing 60 and moves the 2 nd housing 60 in the left direction. At this time, the movement of the 2 nd housing 60 to the left is guided by the guide rail 18. The hole 56 is formed in the 2 nd carriage 52, and the projection 72 of the lock member 70 engages with the hole 56 of the 2 nd carriage 52, whereby the movement of the 2 nd carriage 52 inside the 2 nd housing 60 is regulated. As shown in fig. 5A, the notch portion 71 of the lock member 70 contacts the convex portion 63 of the 2 nd housing 60, and downward movement of the lock member 70 is restricted. In fig. 5A and 5B, the left side surface of the lock member 70 is exposed for convenience of illustration, but in actuality, as shown in fig. 4A, the left side surface of the lock member 70 is covered with the left side plate 61.

Next, as shown in fig. 4B, the user stops the movement of the 2 nd casing 60 at a position where the left side surface of the 1 st casing 10 coincides with the left side surface of the 2 nd casing 60.

Next, as shown in fig. 4C and 5B, the user grips the grip portion 25 of the fixing member 20 and rotates the fixing member 20 counterclockwise. Then, the 2 nd projecting portion 22 projects from the 2 nd opening portion 12 and fits into the 3 rd opening portion 64, whereby the 2 nd casing 60 is fixed to the 1 st casing 10. At the same time, the 1 st projecting portion 21 pushes up the lock member 70, and the engagement position of the projecting portion 72 with the hole 56 is shifted, whereby the restriction of the movement of the 2 nd carriage 52 is released. The connector 30 covered by the grip portion 25 is exposed.

Next, the user connects the connector 30 of the 1 st housing 10 and the connector 80 of the 2 nd housing 60 with wires (not shown). Through this connection, an image signal can be output from the scanner 50 to the printer 1.

According to the image forming system 100 of the present embodiment described above, the scanner 50 and the printer 1 can be coupled and the movement restriction of the 2 nd carriage 52 can be released at the same time by operating the lock member 70. During the joining operation of the scanner 50, the movement of the 2 nd carriage 52 inside the 1 st housing 10 is restricted, and the movement restriction of the 2 nd carriage 52 is released while the scanner 50 is joined to the printer 1. Accordingly, according to the image forming system 100 of the present embodiment, the printer 1 and the scanner 50 can be easily coupled to each other, and the 2 nd carriage 52 of the optical system of the scanner 50 can be prevented from being damaged.

Further, according to the image forming system 100 of the present embodiment, since the scanner 50 can be electrically connected to the printer 1 after the scanner 50 is fixed to the printer 1, malfunction of the printer 1 and the scanner 50 can be prevented.

Further, according to the image forming system 100 of the present embodiment, the guide rail 18 of the 1 st housing 10 is fitted into the groove 66 of the 2 nd housing 20, and the 2 nd housing 20 is guided to a predetermined position with respect to the 1 st housing 10, whereby the 1 st projection 21 and the 2 nd projection 22 are positioned below the lock member 70 and the 3 rd opening 64, respectively. Therefore, the 2 nd housing 20 can be easily positioned with respect to the 1 st housing 10.

The above embodiment may be modified as described below.

In the above embodiment, the fixed member 20 is configured to rotate, but the fixed member 20 may be configured to move. For example, in the example shown in fig. 6A and 6B, hook-shaped openings 15A and 17A are formed in the right side plate 14 and the left side plate 16 of the 1 st case 10A, respectively, and both right and left end portions of the shaft portion 23 of the fixing member 20 are supported by the openings 15A and 17A. The openings 15A and 17A are formed of 1 st portions 15A1 and 17A1 extending in the vertical direction and 2 nd portions 15A2 and 17A2 extending in the front-rear direction from the upper end portions thereof, and the lower end portions of the 2 nd portions 15A2 and 17A2 are formed so as to be lower on the rear side than on the front side. The shaft 23 has a1 st projection 21A similar to the 2 nd projection 22 formed at a position corresponding to the 1 st opening 11. The fixing member 20 is supported by the openings 15A and 17A in a posture in which the 1 st protruding portion 21A and the 2 nd protruding portion 22 face upward. To couple the scanner 50 to the printer 1, the fixing member 20 is moved upward along the 1 st parts 15a1 and 17a 1. By this operation, the 2 nd projecting portion 22 is fitted into the 2 nd opening portion 12, and the 1 st projecting portion 21A jacks up the lock member 70. Next, the fixing member 20 is moved backward along the 2 nd parts 15a2, 17a2, whereby the fixing member 20 is fixed to the 2 nd parts 15a2, 17a 2.

In the above embodiment, the connector 30 is exposed by operating the fixing member 20, but it may be configured such that connectors are provided on the top plate 13 of the 1 st housing 10 and the bottom plate 65 of the 2 nd housing 60, and when the 2 nd housing 60 is moved to the position shown in fig. 4B, the connector of the 1 st housing 10 is connected to the connector of the 2 nd housing 60.

In the above embodiment, the guide rail 18 is provided on the top plate 13 of the 1 st case 10, and the groove 66 is provided on the bottom plate 65 of the 2 nd case 60, but for example, the top plate 13 of the 1 st case 10 may be formed in a concave shape in which the central portion is depressed downward with respect to the front and rear end portions, and the bottom plate 65 of the 2 nd case 60 may be formed in a convex shape corresponding to the top plate 13 of the 1 st case 10. In short, the upper surface of the top plate 13 of the 1 st case 10 and the lower surface of the bottom plate 65 of the 2 nd case 60 may be formed in a shape that guides the movement of the 2 nd case 60 in one direction along the upper surface of the top plate 13.