JPH0677299U - Printed circuit board suction jig - Google Patents

Abstract

(57) [Summary] [Purpose] By limiting the dedicated part of the suction jig, which was conventionally manufactured for each different type of printed circuit board, to only the top plate, the manufacturing cost is reduced, the jig storage space and management are performed. Achieve a reduction in labor. [Structure] Negative pressure introducing hole 18 for adsorbing the lower surface of the printed circuit board
And a communication hole 11a for guiding negative pressure to the negative pressure introduction hole when the top plate is supported on the upper surface.
And a side plate 22 fixedly arranged on the outer periphery of the main body, and the base plate has a concave portion for supporting the lower edge of the side plate. A portion of the negative pressure introduced from the introduction hole is defined between the recess 11b and the lower edge of the side plate. Lower it.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to an improvement of a jig for adsorbing a printed circuit board.

[0002]

[Prior art]

 When mounting various components such as ICs, capacitors, resistors, etc. on the wiring patterns of printed circuit boards used for various electronic devices, solder paste is printed and formed on the patterns in a predetermined arrangement in advance. A method of soldering by mounting a mounted component on a solder paste by a reflow method or the like is often used.

In the process of printing the solder paste on the printed circuit board, it is fixed in the solder paste printer with the bottom surface of the board attracted and held by a suction jig, and a mask covering the surface of the board is attached. It is common to print via.

FIG. 2 is an external perspective view showing the structure of a conventional printed circuit board suction jig, and FIG. 3 is a vertical cross-sectional view thereof. The suction jig 1 has a communication hole 2a connected to a vacuum pump (not shown). The base plate 2 has a base plate 2 and a top plate 3 having a negative pressure introducing hole 3a fixed to the base plate 2 with a screw 5 and communicating with the communication hole 2a. The negative pressure introduced into the negative pressure introducing hole 3a through the suction attracts the printed circuit board 4 mounted on the top plate 3.

By the way, one suction jig cannot be used for suction of all printed circuit boards, and a dedicated suction jig must be manufactured according to the size and shape of the printed circuit board to be sucked. For this reason, when printing on a wide variety of printed circuit boards, it is necessary to manufacture a dedicated suction jig with a shape and structure that suits each product type. It has the problem of becoming extremely large. However, since the conventional suction jigs each consist of two dedicated parts, the base plate and the top plate, as described above, the cost for jig manufacturing becomes enormous, and the space required for storing unused jigs is large. There is a tendency that the labor for securing and managing the maintenance is increasing, and improvement of this point was desired.

[0006]

[The purpose of the device]

 The purpose of the present invention is to reduce the manufacturing cost, the jig storage space, and the management labor by limiting the exclusive part (replacement part) of the suction jig manufactured for each different type of printed circuit board to only the top plate. It is to provide the realized suction jig.

[0007]

[Constitution of device]

 The present invention will be described below based on the embodiments shown in the drawings.

FIG. 1 is a vertical sectional view showing the construction of an embodiment of a suction jig of the present invention. This suction jig 10 is composed of a base plate 11 and a top plate 12 mounted on the base plate. The points are characteristic.

The base plate 11 is spread over a communication hole 11a for introducing a negative pressure from a vacuum pump (not shown), a recess 11b having a uniform depth formed on the upper surface, and a bottom surface and an inner wall in the recess 11b. Rubber sheet (bonded) (elastic sheet) 14. The recess 11b is configured to allow the negative pressure from the vacuum pump to be introduced by communicating with the communication hole 11a. Since the base plate 11 is a component used in common to different types of printed circuit boards, the size and shape of the recess 11b are set large in advance so that it can be applied to all types of printed circuit boards.

The top plate 12 has a top plate body 16 having a shape and size adapted to the shape and size of the printed circuit board to be attracted, and a negative pressure introducing passage 18 penetrating the inside of the top plate body 16 in the thickness direction. It has a suction pad (packing) 20 provided at the upper end opening (suction portion) 18a of the introduction path 18 and a side plate 22 fixed to the whole or part of the outer periphery of the side surface of the top plate body 16.

The upper end opening 18 a of the negative pressure introducing passage 18 provided with a suction pad is a portion for sucking the bottom surface of the print substrate (not shown), and when the top plate 12 is placed on the base plate 11, it is connected to the communication hole 11 a. By communicating with the lower end of the pressure introducing hole 18, the negative pressure from the vacuum pump is guided to the opening 18a and the printed circuit board is adsorbed.

The side plate 22 is configured such that the lower end edge thereof projects from the bottom surface of the top plate body 16 by a predetermined length (depth of the recess 11b-wall thickness of the rubber sheet). When the side plate 22 is arranged over the entire circumference of the main body 16, the recess 11b is also formed in an annular shape so as to cover the entire outer circumference of the top plate main body 16. Further, when the side plate is arranged at an appropriate position of the main body 16, the recess 11b having a length corresponding to the length of the side plate 22 is formed. By arranging the rubber sheet 14 up to the inner wall of the recess 11b, it is possible to secure airtightness between the rubber sheet 14 and the side end surface of the side plate 22.

Therefore, when a negative pressure is introduced from the communication hole 11a with the top plate 12 placed on the base plate 11 as shown in the drawing, the negative pressure is defined between the lower end edge of the side plate 22 and the recess 11b. Since the pressure in the void 25 decreases, the lower edge of the side plate bites into the rubber sheet 14, and the two come into airtight contact. Therefore, the vacuum loss due to air leakage is significantly reduced, and it is not necessary to fix the base plate 11 and the side plate 22 with screws or the like.

Reference numeral 5 is a positioning protrusion projecting from the upper surface of the base plate 11, and is fitted into the positioning hole 16 a of the top plate body 16 to align the positions of both.

The rubber sheet 14 is not always necessary, and an elastic packing member may be arranged along the lower edge of the side plate, or the side plate and the bottom surface of the recess may be directly in contact with each other.

At the time of attachment / detachment accompanying replacement of the top plate, the vacuum pump on the printing machine side may be stopped to facilitate removal.

In the present invention, in particular, in order to reduce the manufacturing cost, consideration is given to simplifying the shape by reducing the machining of the dedicated parts as much as possible, for example, for forming the vacuum path (negative pressure introducing hole 18). The spot facing part is provided on the base plate side.

In the above embodiment, the side plate is fixed to the outer peripheral surface of the top plate body and the lower edge of the side plate is projected. However, any suction jig having substantially the same configuration as the side plate is provided by the present invention. It is included in the range of. For example, a protrusion is integrally provided downward from the lower surface of the outer periphery of the top plate body itself to replace the side plate, or a protrusion made of an elastic body is protruded from the lower surface of the outer periphery of the top plate body itself. Any of these variations are included in the present invention.

In the present invention, the base plate 11 is used as a common component commonly used for a plurality of types of top plates, and the top plate 12 is exclusively used for each different type of printed circuit board (replacement). Since the top plate is the only component that needs to be replaced when the type of the printed circuit board to be picked up changes, only the top plate 12 as a dedicated component needs to be replaced. In other words, only the top plate needs to be manufactured in advance according to the type of printed circuit board, which is advantageous in terms of cost reduction, storage space, and management labor. Specifically, the manufacturing cost of the suction jig can be reduced by 30 to 40%, and the storage space can be reduced to about half.

The reason why the top plate is not used as a common component is that the top plate needs to be variously deformed according to changes in various conditions such as the shape and size of the printed circuit board and the position where the through holes are formed. It is clear that even if they are unified into one, the versatility for multiple printed circuit boards is lost.

[0021]

[Effect of device]

 As described above, according to the present invention, the manufacturing cost is reduced and the jig storage space is reduced by limiting the exclusive portion of the suction jig, which was conventionally manufactured for each different type of printed circuit board, to only the top plate. Also, it has become possible to reduce management labor.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a suction jig according to an embodiment of the present invention.

FIG. 2 is an external perspective view of a conventional suction jig.

FIG. 3 is a vertical sectional view of a conventional suction jig.

[Explanation of symbols]

10 ... Suction jig, 11 ... Base plate, 11
a ... communication hole, 11b ... recess, 12 ... top plate, 14 ... rubber sheet (elastic sheet) 16,
・ Top plate body, 18 ... Negative pressure introduction path, 18a
・ ・ ・ Top opening (suction part), 20 ... Suction pad (packing), 22 ... Side plate

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[Procedure amendment]

[Submission date] March 2, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3] ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 30, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

Claims (2)

[Scope of utility model registration request] 1. A top plate having a negative pressure introducing hole for adsorbing a lower surface of a printed circuit board, and a base plate having a communicating hole for guiding a negative pressure to the negative pressure introducing hole when the top plate is supported on the upper surface. In a printed circuit board suction jig, the top plate has a main body having the negative pressure introduction hole,
A replacement part comprising a side plate fixedly arranged on an outer peripheral portion of the main body, wherein the base plate, which is a common part, is a recess for supporting a lower end edge of the side plate and communicates with the communication hole. And a part of the negative pressure introduced from the introduction hole lowers the pressure in the void defined between the recess and the lower edge of the side plate. 2. A printed circuit board suction jig according to claim 1, wherein an elastic sheet is interposed between the recess and the side plate to improve airtightness.