JPH01177935A - Device for automatically locking screw of on-board part for board - Google Patents

Abstract

PURPOSE:To enable a device to be applicable to various types of parts, and thereby enable screws to be positively fastened even onto a board susceptible to be easily deflected by providing a type judging means, and thereby constituting pressing force to be applied when a section which is to be locked with screws is slightly pressed so that push-up force acts on. CONSTITUTION:Those operations such as setting a board A to a support frame 5, movement to a screw locking point by means of a X/Y table 6, pressing the board A at the screw looking point and shipping the board A after screws have been locked are entirely performed automatically based on a controlled program. In addition, pressing the board A is performed by intensive force capable of withstanding the press-up force of a screw fastening machine only at the time of screw fastening, a part, even if it is a printed board product susceptible to be easily deflected, can thereby be locked with screws safely and positively from the lower side of the board A, and furthermore effectively processed under an unattended condition. And since it is equipped with a type judging means 10, a device set forth herein above can be applied to various types of parts, thereby enabling the same device to be economically operated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an apparatus for automatically screwing mounted components onto a printed circuit board or the like that is bent by a small force from below the board.

[Conventional technology and its problems]

For installation, there are various devices for screwing components such as connectors positioned on a surface from above. However, according to the method of screwing from above, the following problem occurs when parts set on a board are screwed from the back side of the board.

In other words, in such cases, the method is to first place the component on the board, then support the component, turn the entire board 180 degrees, and tighten the screws from above. Even if you automate the process, an increase in work processes cannot be avoided. In addition, it is not easy to stably support multiple components at the same time and flip the board over, and there are also problems with quality assurance, such as parts that have already been placed falling off during flipping.

Note that there are devices that tighten screws from below the board, but these devices are only effective for specialized products with a certain shape and size, and if the board is a printed circuit board, etc. However, the board was bent by the thrust force of the screw tightening machine, making it impossible to secure the screws securely.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an automatic screw-fastening device that can be applied to a wide variety of products and that can reliably tighten screws from the bottom of a board even on a flexible board.

[Means to solve the problem]

The screw fastening device of the present invention includes a screw fastening machine that is placed facing upward at a screw fastening point, a support frame that is located between conveyors arranged in series, and a substrate that is supplied from one of the conveyors that is transferred to a setting point on the support frame. and a transfer means for sending the substrate from the setting point onto the other conveyor after screwing is completed; A board transfer and positioning device equipped with a Y-table and a type discrimination means for discriminating the type of board and issuing a control program change command, and the above-mentioned screw tightening machine It is composed of a presser mechanism that is light from the top up to the starting point of screw tightening, and presses strongly while resisting the upward force of the screw tightening machine when tightening the screws.

[Effect]

If a product type discrimination means is provided and the control program of the device is changed to a program corresponding to the product type, it becomes possible to handle a wide variety of products.

In addition, the holding mechanism lightly presses the screwed part of the part,
When the thrust force of a screw tightening machine is applied to the board, a pressing force sufficient to support the force is applied, so that the board does not bend.

〔Example〕

Embodiments of the present invention will be described below based on the accompanying drawings.

Screw tightening machine 1 installed upward at the screw fixing point (Figure 3)
A substrate holding mechanism 2 is provided directly above the substrate. Further, at a location away from the belt, conveyors 3.4, each consisting of two endless belts arranged in parallel with a predetermined width, are installed in series at a predetermined interval. Furthermore, conveyor 3.4
A substrate support frame 5 having a guide groove for the substrate is arranged between them.

6 is an xy table that moves the support frame 5 in two horizontal axes directions. This table 6 has pulse motors 6a, 6a
' is a drive source, ball screws 6b and 6b' are power transmission means, elements without a dash move the holding table 6c of the support frame 5 along the rail 6d in the X-axis direction, and elements with a dash in the X-axis direction. Although the support table 6e of the mechanism is moved in the Y-axis direction along the rail 5d', the present invention is not limited thereto.

Reference numeral 7 denotes a transfer means provided between the conveyors 3 and 4 along the substrate A transport line. This transfer means includes a rodless cylinder 7b that propels the moving body 7a in the longitudinal direction of the conveyor.
As shown in FIG. 5, it is composed of two locate pins 7c and 7d attached downward to the movable body 7a, and a cylinder 7e for raising and lowering the pins, and it moves the supply substrate from the conveyor 3 as shown in the figure. It is transferred onto the support frame 5 which is waiting at the position. The operation at that time is to move the movable body 7a to the conveyor 3 side, then lower the locate pins and locate one pin 7a.
C into the locating hole on the board side, and then move the moving body 7a
The board is pulled back toward the conveyor 4 side to stop the board at a fixed point on the support frame 5, and the locate pin is raised and removed from the locate hole.

Further, the transfer means 7 transfers the substrate A to the support frame 5 after screwing is completed.
The board is moved onto the conveyor 4 from above, but at this time, the locate pin 7d, which was lowered after being moved again to the conveyor 3 side, is locked to the rear edge of the board in the traveling direction, and
Push out the board with the second return motion.

Reference numeral 8 designates a locate pin on the side of the support frame 5 that is raised and lowered by a cylinder 9. It is inserted from below into the locate hole of the board, and after the locate pin 7c has been pulled out, the support frame 5 is held until the board is returned to the conveyance line after screwing is completed. position on top.

Next, the presser mechanism 2 has a configuration shown in FIGS. 6 and 7.

That is, on the support plate 2a integrated with the device frame,
The cylinder 2b and the air chuck 2c are fixed on the same axis with their positions changed up and down. Also, in the center of the chuck is a presser rod 2e that is biased downward by a spring 2d.
is made to face the screw tightening machine 1 and is slidably penetrated therethrough. When the presser rod 2e protrudes downward from the cylinder 2b, the movement rule by the arm 2f at the tip of the cylinder ram is released, and the presser rod 2e descends under the force of the spring 2d and its own weight.

The board A, which has been transferred from the conveyor 3 onto the support frame with components such as connectors placed in a predetermined position, is moved and positioned by the X/Y table 6 so that the point to be screwed is directly under the holding rod 2e. . The presser rod 2e first presses the screwed point of component B from above after positioning, but at this time, the presser rod 2e is used to weaken the force of the spring 2d than the force that causes the board to bend, so it can only be pressed one-sidedly. Even if it is, it does not deform the board. After this pressing, the chuck 2C is activated to clamp the presser foot loft 2e with a force that can withstand the thrusting force of the screw tightening machine, and then the screw tightening machine 1 is thrust up to perform screw fastening. The reason for holding the presser rod 2e with a chuck while tightening the screws is that the pushing up force of the screw tightening machine is usually 10
This is because the substrate is so large that it exceeds kg, and unless a counterforce is applied to the other surface (upper surface), the substrate will crack or deform. In the illustrated presser mechanism, the presser loft 2e acts as a reaction force receiver, so the forces applied to both sides of the substrate are balanced, and the substrate is reliably protected. Moreover, since the rod 2e can be moved upward by a length l with respect to the arm 2f, and the chuck 2c can also grip any point on the rod 2e, the height dimension of the screwed part of the product is l.

can also cope with changes in

Note that 2g is a pilot bin provided as necessary. In order to position the part, this pin is lowered by the force of the cylinder 2h in advance of the holding rod 2e, and is inserted into the pilot hole of the part B at the bottom dead center.

Screw-fastening work is performed based on a preset control program, but as the screw-fastening position changes when the product type changes, the control program must also be changed. It is a means of determining the variety. This discrimination means 10 provided on the upper part of the conveyor 3 consists of a plurality of reflective optical fiber sensors 10a shown in FIG.
The board type is determined based on the number and arrangement pattern of the discrimination holes 10b of the dummy board A' that is flown first for each loaf 1, and the operation program according to the type is sent to the control unit of the device. issue instructions to operate.

〔effect〕

As described above, according to the device of the present invention, it is possible to set the board on the instruction frame, move the board to the screwing point using the X-Y table, hold the board at the screwing point, and carry out the board after screwing. Everything is done automatically based on the control program, and the board is held down only when tightening the screws with a strong force that can withstand the pushing force of the screw tightener, so even if the product is a printed circuit board that is easily bent, It becomes possible to safely, reliably, and efficiently attach screws to the board from below, completely unmanned.

Furthermore, since it includes a product type discrimination means, it is possible to handle a wide variety of products, and the same device can be operated economically.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the entire apparatus of the present invention, Fig. 2 is a side view thereof, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 4 shows the conveyance line section. Enlarged plan view for easy understanding,
Fig. 5 is a sectional view taken along the line V-V in Fig. 4, Fig. 6 is an enlarged view of the presser mechanism taken along the line ■-■ in Fig. 1, and Fig. 7 is a cross-sectional view taken along the line ■-■ in Fig. 1. The diagram along the line, FIG. 8, is a diagram showing a schematic configuration of the type discrimination means. 1... Screw tightening machine, 2... Presser mechanism, 2a... Support plate, 2b...
・Cylinder, 2c...Air chuck, 2d...Spring, 2f...Arm, 3.4...Conveyor, 5...
Support frame, 6...X-Y table, 7...
・Transfer means, 7a...Moving body, 7b...Rodless cylinder, 7c, 7d...
...Locate pin, 7e...Cylinder,
8...Locate pin, 9...Cylinder, 10...Type discrimination means, 10a.
...Optical fiber sensor, 10b...Discrimination hole. Patent applicant Sumitomo Electric Industries, Ltd. Agent Kama 1) Text 2 Figure 1 Figure 2 WJS Figure 4 Figure 6 Figure 7

Claims (1)

[Claims] A screw tightening machine is placed facing upward at the screw tightening point, and a support frame is positioned between the conveyors arranged in series.The board supplied from one conveyor is transferred to the setting point on the support frame, and after screw tightening is completed, the above A transfer means that sends it from the setting point onto the other conveyor, an X/Y table that moves the board on the frame together with the support frame so that the part to be screwed is on the screw tightening machine, and a type of board is determined. A board transfer and positioning device equipped with a type discrimination means that issues a command to change the control program, and a screw-fastening part of the component set on the board facing the screw-fastening machine from the top to the screw-fastening starting point. This is an automatic screw-fastening device for mounting components on a board, which is lightweight and consists of a presser mechanism that withstands the upward force of the screw tightening machine and strongly presses the screws when tightening the screws.