JP3001543B1 - Electronic device mounting structure and connection assembly jig - Google Patents

Abstract

The present invention provides a mounting structure of an electronic device capable of securing a mounting area and enabling short-distance wiring of an ultra-high-speed signal when mounting an electronic circuit package having an ultra-high speed and an ultra-high number of terminals on the electronic device. SOLUTION: The mounting structure of the electronic device includes a front-side bookshelf mounting section 2 on which a basic ATM switch package 11 is mounted, a front-side backboard disposed on the back side of the front-side bookshelf mounting section, A back side back board arranged on the back side of the back board, a plurality of sets of connectors provided to face both boards, and another basic ATM switch arranged on the back side of the back side back board A back-side bookshelf mounting unit on which the package is mounted; each connector is configured to be selectable between a connected state and a disconnected state before mounting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM (Asynchronous Transfer) for handling an ultra-high-speed signal.
r Mode: Asynchronous transfer mode) The present invention relates to a mounting structure of an electronic device suitable for an exchange system or the like, and particularly to a front of an electronic circuit package configured by combining a rear bookshelf mounting section on the back of a front bookshelf mounting section. Related to rear mounting structure.

[0002]

2. Description of the Related Art A conventional electronic device mounting structure is disclosed in
Japanese Patent Application Laid-Open Nos. 8-306747 and 7-202456, and the like, and a backboard connector of an electronic device is disclosed in Japanese Patent Application Laid-Open Nos.
181668 and the like.

In this specification, as a conventional technique, a bookshelf mounting structure in which an electronic circuit package of an electronic device such as an ATM switch, which is generally employed, is mounted in a bookshelf shape is described with reference to FIGS. explain.

[0006] The bookshelf mounting section 2 is configured to be mounted on a bookshelf-shaped mounting frame 3. In order to configure an ATM switch by such a bookshelf mounting unit 2, an electronic circuit is divided according to the size of the electronic circuit package 1, and connections between the electronic circuit packages 1 are connected by printed wiring of the backboard 4. Structure is adopted. Furthermore, in the conventional bookshelf mounting section 2 described above, a through-air radiating structure in which the cool air is forcibly sucked in from the lower portion of the frame by the fans 6 of the fan units 5 in the upper portion and the lower portion of the frame to blow the cool air toward the upper portion of the frame. Adopts and dissipates heat.

[0005]

When the ATM switch is divided into circuits by the conventional bookshelf mounting section 2 described above, the signal speed of the ATM switch becomes, for example, 15
Since the speed is as high as 6 to 311 Mbps, the rise time of the pulse is shortened. In addition, in this specification, various numerical values are shown as an example. Therefore, the ratio of the number of signal assignments to the number of grounding contacts of the connector is set to approximately 1: 1 and the characteristic impedance of the contacts is matched to the characteristic impedance of the transmission line (for example, a printed pattern, a cable, etc.) to reduce pulse waveform distortion. It is necessary to reduce the size or to surround the signal contact with a ground to reduce crosstalk in the connector portion. Therefore, the number of terminals of a connector required as an electronic circuit package of an ATM switch is, for example, 100.
It increases extremely, for example, from 0 to 5000.

[0006] However, in the conventional bookshelf mounting section 2 described above, the terminals of the connector can be connected to the outside only from the end face in the depth direction of the electronic circuit package. The wiring is concentrated on one end surface of the mounted bookshelf mounting section 2, and there is a disadvantage that the number of layers of the printed wiring board increases.

Further, as shown in the circuit block diagram of FIG. 13, a large number of basic ATM switches 7 are connected in a grid pattern to increase the number of connectable lines.
The switch method has a large amount of hardware and each basic ATM
It is necessary to connect between the switches 7 and between each basic ATM switch 7 and each optical interface (hereinafter, sometimes referred to as “optical INF”) 8 so that signals can be transmitted at a very high speed. This lattice-expanded ATM switch system is applied to the bookshelf mounting section 2 and an optimal arrangement for providing the shortest wiring length between the basic ATM switches 7 is shown in FIG.
(A) is shown with a number.

Here, the size of the back board 4 in the bookshelf mounting structure shown in FIG.
mm and a height of 800 mm, the handleability deteriorates, the development period of the backboard 4 is prolonged, and the manufacturability of the backboard 4 deteriorates.

On the other hand, FIG.
FIG. 9 is a diagram schematically illustrating a relationship between an arrangement of an LSI mounted on an electronic circuit package and a wiring length of an ultra-high-speed signal when an F8 and a basic ATM switch 7 are arranged. It can be understood that the wiring length of the ultra-high-speed signal is determined by the sum of the wiring length 9 depending on the LSI arrangement and the wiring length 10 depending on the package arrangement.

Here, as shown in the circuit block diagram of FIG. 13, # 0 connected to optical INF8 of # 48-63.
The horizontal distance between the ATM switches 3 and # 12 is equivalent to eight electronic circuit packages 1 in light of the arrangement shown in FIG. Since the width of the basic ATM switch 7 that can be realized while satisfying the heat radiation characteristics and the number of connector terminals is about 45.72 mm, the wiring length 10 depending on the package arrangement is 45.72 mm × 8 = 365.76 mm.
become. The wiring length 9 depending on the LSI arrangement is shown in FIG.
When calculated from (b), the length is 340 mm, so the wiring length of the ultra-high-speed signal is about 706 mm, and the transmission rate that can be transmitted by unbalanced transmission is about 100 Mbps.
There is a disadvantage that 1152 terminals are increased as compared with the number of connector terminals when 0 Mbps transmission is possible.

In order to improve such disadvantages of the prior art, the present invention is to provide a mounting area and a short distance of an ultra-high-speed signal when mounting an ultra-high-speed and multi-terminal electronic circuit package on an electronic device. An object of the present invention is to provide a mounting structure of an electronic device capable of wiring and a jig for connecting the same.

[0012]

The present invention employs the following means to solve the above-mentioned problems.

1. A front-side bookshelf mounting section on which an electronic circuit package is mounted; a front-side backboard disposed on the back side of the front-side bookshelf mounting section; and a rear-side back disposed on the back side of the front-side backboard. A board, a plurality of sets of backboard-backboard connectors provided so as to face the front-side backboard and the rear-side backboard, respectively, are arranged on the rear side of the rear-side backboard, and A back-side bookshelf mounting section on which another electronic circuit package is mounted, wherein each of the backboard-backboard connectors can be selected to be connected or disconnected before mounting. An upper front back backboard and a lower front backboard, each comprising the front side backboard and the backside backboard. And an electronic circuit package connected across the upper-side front rear backboard and the lower-side front rear backboard and a plurality of backboard-side connectors arranged on the electronic circuit package. The rear backboard and the lower front front backboard are divided, and each of the backboard connectors is connected to the front backboard and the rear backboard via each of the backboard / backboard connectors. The mounting structure of electronic equipment that can connect between.

2. 2. The electronic device mounting structure according to claim 1, wherein the backboard-to-backboard connectors are arranged in a plurality of rows, and connection / disconnection can be selected for each row.

3. An upper-stage front back backboard and a lower-stage front rear backboard, each composed of a front-side backboard and a rear-side backboard, are divided, and the upper-stage front-back backboard and the lower-stage front-back backboard are divided. And a plurality of backboard-side connectors disposed on the electronic circuit package, and each of the backboard-side connectors is opposed to the front-side backboard and the back-side backboard. In a mounting structure of an electronic device capable of connecting between the front-side backboard and the rear-side backboard via a plurality of sets of backboard-backboard connectors provided respectively, a flat plate, A plurality of positioning members for fixing the front side backboard and the rear side backboard which are arranged so as to overlap on a flat plate; A power transmission mechanism for sliding the slider, and a handle for operating the power transmission mechanism. Connection assembly jig for mounting structure of electronic equipment to be used.

4. 4. The electronic device according to claim 3, wherein the backboard / backboard connectors are arranged in a plurality of rows, and the slider selects one of the backboard / backboard connectors in a row in a connected or unconnected state. Connection assembly jig with mounting structure.

5. Each of the positioning members includes a pair of holding bearing members for holding the front side backboard and the backside backboard, and positioning pins for fixing the front side backboard and the backside backboard to the holding bearing members. The power transmission mechanism is moved to a shaft to which the handle is attached and supported by the pair of holding bearing members, a pair of eccentric cams fixed to the shaft, and the pair of eccentric cams. 4. The connection assembling jig for a mounting structure of an electronic device according to the above item 3, comprising a pair of eccentric cam driven members coupled to the slider.

[0018]

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A mounting structure of an electronic device according to an embodiment of the present invention will be described with reference to FIGS.

FIGS. 1 to 5 show an embodiment of the present invention. 1 to 3 are a front view, a longitudinal sectional view, and a rear view showing a mounting structure of an electronic device having a front-side bookshelf mounting section and a rear-side bookshelf mounting section, and FIG. FIG. 5 is an enlarged vertical sectional view, and FIG. 5 is a partial enlarged horizontal sectional view of a bookshelf mounting portion.

In FIG. 1, eight basic ATM switch packages 11 from # 08 to # 15 in the circuit block diagram of FIG. 13 are mounted on the front-side bookshelf mounting section 2, and the circuit block diagram of FIG. From # 00 to # 0
8 basic ATM switch packages 11 up to 7
It is mounted on a back-side bookshelf mounting section (not shown).

As shown in FIGS. 4 and 5, a backboard / backboard connector (hereinafter referred to as "BWB connection") for detachably connecting the front backboard 19 and the rear backboard 20 to each other. The connector 12 is disposed at an appropriate position where the wiring length of the ultra-high-speed signal between the basic ATM switch packages 11 is reduced, and the front surface of the BWB connection connector 12 is closed by the connector front plate 13 to dissipate heat. Prevent the wind from leaking.

The optical INF package 14 has an interface LSI 16 and is disposed above and below the basic ATM switch package 11 disposed in the middle stage. Considering the position of the switch LSI 15 of the basic ATM switch package 11, the connection relationship can be designed by selecting the upper optical INF package 14 or the lower optical INF package 14 and the front side or the rear side. The wiring length 9 depending on the above-described LSI arrangement can be optimally determined. Further, since the optical INF package 14 arranged on the front side or the rear side near the basic ATM switch package 11 can be appropriately selected, the wiring length 10 depending on the package arrangement can be optimally determined.

In the heat dissipation of the basic ATM switch package 11 and the optical INF package 14, the fans 6 and 6 of the fan units 5 and 5 in the upper and lower portions of the frame forcibly suck cool air from the lower portion of the frame and move toward the upper portion of the frame. This is performed by a through-blowing method. The area to radiate heat is
The back board is divided into a front surface and a back surface, and the number of fans 6 to be used can be designed to be equal to that of the conventional technology. Therefore, heat radiation comparable to that of the conventional technology is possible.

In FIG. 4, the basic A mounted on the middle stage
In the TM switch package 11, two backboard-side connectors 22 arranged on the upper side from the center thereof are connected to the upper-stage front-back backboard 17, and two backboards arranged on the lower side from the center thereof. Side connector 2
2 is connected to the lower front front back board 18. Further, the upper front back back board 17 and the lower front back back board 18 are respectively composed of a front back board 19 and a back back board 20, and are connected by the BWB connection connector 12 at the position shown in FIG. Have been.

Therefore, the connection positions of the two backboard-side connectors 22 arranged on the upper side of the basic ATM switch package 11 are not limited from the center to the upper part. , The front side backboard 19 and the back side backboard 20 can be connected. Similarly, the connection positions of the two backboard-side connectors 22 arranged below the basic ATM switch package 11 are not limited from the center to the lower part. Front side backboard 19 and back side backboard 20
Can be connected between

FIGS. 6 (a), 6 (b) and 6 (c) show the divided backboard structures as the front unit frames 39 (see FIG. 6) of the upper front rear backboard 17 and the lower front backboard 18, respectively. 10 (see FIG. 10), a plan view, a front view, and a side view shown according to the arrangement. Since the front side back board 19 and the back side back board 20 are fixed by sandwiching three reinforcing beams 21 therebetween, the insertion and removal force of about 88 kg of the basic ATM switch package 11 is applied. Also, no deformation that impairs the function occurs.
Further, since the upper front back back board 17 and the lower front back back board 18 can be divided, the size of the back board can be designed to have a width of 585 mm and a height of 394 mm. The properties are good.

FIG. 7 shows the backboard side connector 22 and the BWB connection connector 12 connected to the basic ATM switch 7, and the backboard side connector 22 has 35 connectors.
The seven terminals (the number of contacts) and the BMB connection connector 12 have 523 terminals.

FIG. 8 is a sectional view of a connecting portion of the BMB connection connector 12. When an operation load in the direction of the arrow is applied to the slide housing 23 in the unconnected state of FIG. 8A, the plurality of short-circuit female contacts 25 provided on the slide housing 23 move and are provided on the front side back board 19. The plurality of male contacts 24 provided and the plurality of male contacts 24 provided on the back side backboard 20 are short-circuited and connected.

FIG. 9 shows a jig for connecting and connecting the front side backboard 19 and the back side backboard 20. A plurality of clamping bearing members 31 are fixed to both sides of the flat plate 30, respectively, and the front backboard 19 and the rear backboard 20 are sandwiched between the backboards 19, 20 by three reinforcing beams 21. It is clamped by the U-shaped section of the member 31.
A positioning pin 29 is fixed to each of the holding bearing members 31 from the upper surface of each of the holding bearing members 31 by penetrating the front side backboard 19 and the back side backboard 20. The shafts 32 are supported by a pair of opposing holding bearing members 31, and eccentric cams 33 are fixed to both ends of each shaft 32. Each eccentric cam 33 has a hole 35 formed in the center of an eccentric cam follower plate 34. A pair of protrusions 36 are formed symmetrically on both upper sides of each eccentric cam follower plate 34, and one of the protrusions 36 is selected according to the connection or disconnection of the BWB inter-connector 12, and the slider 26 Fit each hole opened at both ends of. The slider 26 and a handle 27 described later are
You only need to prepare one for each. Each eccentric cam follower plate 34
The retaining member 37 is fitted to the shaft 32 from the outside, and the retaining member 37 is fixed to the holding bearing member 31 with two screws 38.

The operation of connecting and disconnecting each of the BWB connecting connectors 12 is performed in units of rows. Each BWB in the desired row
When the inter-connector 12 is connected, the holes formed at both ends of the slider 26 are fitted into the right convex portions 36 of the eccentric cam follower plates 34 corresponding to the rows, and the handle 27
The square holes formed in the bosses 28
Into the corner at one end. When the handle 27 is rotated counterclockwise, the shaft 32 and the eccentric cam 33 are rotated in the same direction, and the eccentric cam follower plate 34 and the slider 26 are moved to the left. For this reason, the slider 26 moves the slide housing 23 shown in FIG.
Then, each short-circuit type female contact 25 moves to the position shown in FIG.
4 and the male contact 24 of the back side backboard 20. The slider 26 and the handle 27 are operated in the same manner when connecting the BWB connection connectors 12 in other rows.

When disconnecting each of the connectors 12 between BWBs in a desired row, the holes formed at both ends of the slider 26 are inserted into the left convex portions 36 of the eccentric cam follower plates 34 corresponding to the row. Fit. When the handle 27 is rotated clockwise, the shaft 32 and the eccentric cam 33 are rotated in the same direction, and the eccentric cam follower plate 34 and the slider 26 are moved rightward.
For this reason, the slider 26 moves the slide housing 23 from left to right in FIG. 8B. Then, each short-circuit type female contact 25 moves to the position of FIG. 8A and separates from the male contact 24 of the front side backboard 19 and the male contact 24 of the back side backboard 20. The slider 26 and the handle 27 are similarly operated when disconnecting the BWB connection connectors 12 in the other rows.

After the above operation is completed, each positioning pin 2
9 is removed from each of the holding bearing members 31, and the front side backboard 19 and the rear side backboard 20 are taken out from the connection assembly jig.

The number of connections between the front-side backboard 19 and the rear-side backboard 20 as described above is 28 connectors × 523 in total of the upper-side front-back backboard 17 and the lower-side front-back backboard 18. Since the number of contacts is 14,644, and the ratio of the number of signal assignments to the number of connector contacts to the number of arm assignments can be approximately 1: 3, the connection to the ground can be made. It is possible to reduce the noise of the connector ground generated between them to a small value.

FIG. 10 shows an upper-stage front-back board 17.
FIG. 9 is a cross-sectional view illustrating a method of attaching the lower front front back board 18 to the front unit frame 39. The front side unit frame 39 is formed as an integral structure, and is first fixed to the column 40 through the unit frame mounting holes 41. Next, from behind the front-side unit frame 39, the upper-stage front rear backboard 17 and the lower-stage front rear backboard 18 are temporarily fixed so as to be finely movable. Thereafter, the contact position locating jigs 42 are fitted to the respective contacts of the back board side connector 22, and the contact position locating jigs 42 are inserted into about five slots of the front side unit frame 39 accommodating the electronic circuit package. The upper front rear backboard 17 and the lower front rear backboard 18 are positioned and permanently stopped. Further, a rear unit frame (not shown) is integrally fixed to the front unit frame 39.

With the simple method described above, the divided upper-stage front rear backboard 17 and the divided lower-stage front rear backboard 18 can be positioned, and are arranged so as to straddle both the backboards 17, 18. Basic ATM
The switch package 11 can be fitted to and removed from both back boards 17 and 18.

The present invention is not limited to the above-described embodiment, and the shape or structure of each part in the mounting structure of the electronic device can be appropriately changed. Further, the case where the present invention is applied to an electronic device such as an ATM exchange has been described above, but the present invention is not limited to this, and can be applied to all mounting structures of electronic devices configured by mounting an electronic circuit package.

[0038]

As is apparent from the above description, the present invention has the following advantages.

1. Since the bookshelf mounting part of the front side backboard and the bookshelf mounting part of the backside backboard can be connected by the BWB connecting connector, the position of the switch LSI of the basic ATM switch package is taken into consideration. The connection relationship can be designed by selecting the optical interface package of the part or the optical interface package of the lower part and the front side or the rear side, so that the connection wiring between each basic ATM switch and the basic ATM switch and the optical interface Wiring to the package can be reduced.

2. Since the upper front rear backboard and the lower front rear backboard can be divided, the backboard can be configured in a size that is easy to handle. Therefore, the development period of the backboard can be shortened, and the manufacturability of the backboard is good because of easy handling.

3. The backboard having a single-layer structure is multi-layered, and the cost becomes exponentially high.
Since the backboard is divided into two pieces and connected by the BWB connection connector, the backboard becomes low-layer and the cost is reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a mounting structure of an electronic device according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a mounting structure of an electronic device according to an embodiment of the present invention.

FIG. 3 is a rear view of the mounting structure of the electronic device according to the embodiment of the present invention;

FIG. 4 is an enlarged vertical sectional view of a bookshelf mounting portion in the mounting structure of the electronic device according to the embodiment of the present invention.

FIG. 5 is a partially enlarged cross-sectional view of a bookshelf mounting portion in the mounting structure of the electronic device according to the embodiment of the present invention.

FIGS. 6A and 6B are three views showing an arrangement of an upper front back backboard and a lower front backboard in a mounting structure of an electronic device according to an embodiment of the present invention, wherein FIG. (b) is a front view, and (c) is a side view.

FIG. 7 shows a backboard-side connector and a backboard-to-backboard (between BWB) connection connector for a basic ATM switch in a mounting structure of an electronic device according to an embodiment of the present invention, and FIG. (B) is a front view.

FIGS. 8A and 8B are cross-sectional views of a connection portion of a backboard / backboard connector in an electronic device mounting structure according to an embodiment of the present invention, wherein FIG.
Indicates the state after connection.

FIG. 9 is a perspective view of a jig for connecting and connecting the front-side backboard and the rear-side backboard in the electronic device mounting structure according to one embodiment of the present invention; However, some parts are disassembled and shown.

FIG. 10 is a cross-sectional view illustrating a method of attaching an upper-stage front back backboard and a lower-stage front back backboard to a unit frame in a mounting structure of an electronic device according to an embodiment of the present invention.

11A and 11B show a conventional bookshelf mounting structure of an electronic device, wherein FIG. 11A is a front view and FIG. 11B is a partial longitudinal sectional view.

FIG. 12 is a schematic diagram showing a relationship between an LSI arrangement of an electronic circuit package and a wiring length of an ultra-high-speed signal in a conventional bookshelf mounting structure of an electronic device, wherein FIG. b) is seen from the front.

FIG. 13 is a circuit block diagram of a lattice-expansion type ATM system in a conventional bookshelf mounting structure of an electronic device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Electronic circuit package 2 Bookshelf mounting part, front side bookshelf mounting part 3 Mounting frame 4 Backboard 5 Fan unit 6 Fan 7 Basic ATM switch 8 Optical interface (INF) 9 LSI-dependent wiring length 10 Package-dependent wiring Length 11 Basic ATM switch package 12 Connector between backboard and backboard (BWB) 13 Connector part front plate 14 Optical interface (INF) package 15 Switch LSI 16 Interface LSI 17 Upper front-back backboard 18 Lower front-back backboard DESCRIPTION OF SYMBOLS 19 Front back board 20 Back back board 21 Reinforcement beam 22 Back board side connector 23 Slide housing 24 Male contact 25 Short-circuit female contact 26 Slider 27 Handle 28 Boss 29 Positioning pin 30 Flat plate 31 Holding bearing member 32 Shaft 33 Eccentric cam 34 Eccentric cam follower plate 35 Hole 36 Convex portion 37 Retaining member 38 Screw 39 Front unit frame 40 Column 41 Unit frame mounting hole 42 Contact position setting jig

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shigeru Kashiwagi 1-21-2 Dogenzaka, Shibuya-ku, Tokyo Inside Japan Aviation Electronics Industry Co., Ltd. (72) Inventor Tomohiko Aso 1-21-2 Dogenzaka, Shibuya-ku, Tokyo No. Japan Aviation Electronics Industry Co., Ltd. (56) References JP-A-3-222499 (JP, A) JP-A-5-739962 (JP, U) JP-A-3-45695 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) H05K 7/14

Claims (5)

(57) [Claims] 1. A front bookshelf mounting section on which an electronic circuit package is mounted, a front backboard disposed on the back side of the front bookshelf mounting section, and a rear side of the front backboard. A back side back board, a plurality of sets of back board / back board connectors respectively provided so as to face the front side back board and the back side back board, and a back side of the back side back board. It has a backside bookshelf mounting part on which another electronic circuit package is mounted, and each of the backboard-backboard connectors can be selected to be connected or disconnected before mounting. And an upper-stage front-back board configured from the front-side backboard and the back-side backboard, respectively. A lower front front back board, and an electronic circuit package connected across the upper front rear back board and the lower front back back board and a plurality of back board connectors arranged therein; The upper front rear backboard and the lower front rear backboard are divided, and each of the backboard connectors is connected to the front backboard and the backboard via the backboard / backboard connector. An electronic device mounting structure capable of connecting to a backside backboard. 2. The electronic apparatus according to claim 1, wherein the backboard-to-backboard connectors are arranged in a plurality of rows, and connection / disconnection can be selected in units of one row. Mounting structure. 3. An upper-stage front rear backboard and a lower-stage front rear backboard, each of which includes a front-side backboard and a rear-side backboard, are divided, and the upper-stage front-back backboard and the lower-stage side are separated. Having an electronic circuit package connected across the front and back backboard and a plurality of backboard-side connectors arranged thereon;
Each of the backboard-side connectors is connected to the front-side backboard via a plurality of sets of backboard-backboard connectors provided so as to face the front-side backboard and the rear-side backboard, respectively. In a mounting structure of an electronic device capable of being connected to a back side backboard, a flat plate, and a plurality of positionings for fixing the front side backboard and the backside backboard disposed so as to overlap on the flat plate. A member, a slider for selecting each of the backboard / backboard connectors to be connected or disconnected, a power transmission mechanism for sliding the slider, and a handle for operating the power transmission mechanism. A connection assembling jig for a mounting structure of an electronic device. 4. The backboard / backboard connectors are arranged in a plurality of rows, and the slider selects one of the backboard / backboard connectors in one row unit in a connected or disconnected state. 4. The connection assembly jig according to claim 3, wherein the connection assembly is a mounting structure for an electronic device. 5. The positioning member includes a pair of holding bearing members for holding the front side backboard and the backside backboard, and fixing the front side backboard and the backside backboard to the holding bearing member. The power transmission mechanism, the handle is attached, and a shaft supported by the pair of clamping bearing members, a pair of eccentric cams fixed to the shaft,
4. The connection assembly jig according to claim 3, further comprising a pair of eccentric cam driven members which are moved by said pair of eccentric cams and are coupled to said slider.