JP2003260592A - Soft landing press unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press unit for a necessary and enough pressure strength and to minimize the stress to a print plate in an in-circuit test or a function test of the print plate with mounted components. <P>SOLUTION: The speed of rotary movement by a speed control motor 53 using AC 100 V power source is reduced by two pairs of sprockets 31, 32, and a soft landing press unit is composed of a crank structure for changing the rotary movement of the sprockets to the linear motion (in up and down direction) of a pressure top plate between a crank link 40 for connecting the rotary axis of the sprocket whose speed is reduced and the lower edge part of the link 16 connected to the upper edge part of the working base. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft landing press unit used as an auxiliary device when performing an in-circuit test or a function test of a printed board on which components are mounted.

[0002]

2. Description of the Related Art In the in-circuit test or function test of a printed circuit board on which components are mounted, a method of pressing a test probe of a fixture jig against a conductive portion of a printed circuit board pattern is used. , An air cylinder type press is used. In the air cylinder method, the maximum pressure is generated regardless of the position of the cylinder, and suddenly exerts a large force on the printed board to be measured, which adversely affects the mounting parts and the bonding parts with the bonding parts. . Further, there is a method of adjusting the drive speed by using a needle valve for cushion of the cylinder, but the adjustment range is narrow and unstable. Further, at the time of installation, dry air equipment was required in addition to the AC100V power source.

[0003]

As a method of performing soft landing by a pressing device using a cylinder, combination of cylinders, switching of supply circuit of solenoid valve, etc. can be considered. However, in any of the cases, it is almost impossible to control quickly within the required vertical movement time (about 2 seconds). When sinus curve control using a crank mechanism is attempted instead of the linear control described above, factors such as actuator size increase, drive auxiliary device size increase, and product cost increase are suppressed. It was difficult. The present invention has been made to solve the above-mentioned problems, and is a motor (induction motor, stepping motor) using an AC100V power source as a drive source.
By using a motor or servo motor, etc., and performing a sin θ curve control using the crank mechanism in combination with a crank mechanism (converting circular motion to linear motion), the stress on the PCB to be measured is minimized. It was possible to apply a necessary and sufficient pressure while suppressing the pressure.

[0004]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a front view and a side view showing a configuration of a soft landing press unit according to the present invention. In FIG. 1, the rotational movement of the motor 53 with an electromagnetic brake is converted into the rotational movement of the sprocket 31 and the sprocket 32 connected via the chain 33 and is decelerated.

A link support block 12 is provided at the center of the operation base 9 which constitutes the soft landing press unit.
And a lower end of the link 16 is connected to a rotating shaft of the sprocket 32 via a clamp link 40 to form a crank mechanism. Therefore, the rotational movement of the sprocket 32 is converted into the linear movement (vertical direction) of the upper end portion of the link 16,
The operation base 9 connected to the upper end of the link 16 also performs a vertical linear motion in accordance with the rotational motion of the electromagnetic brake motor 53.

Since a plurality of pressure top plates 62 are vertically attached to the lower surface of the operation base 9, the push rods arranged on the pressure top plate 62 are moved as the operation base 9 moves downward. The tip portion is pressed against the measured printed board 63, and the conductive portion of the measured printed board 63 and the test probe 64 embedded in the fixture jig 61 come into pressure contact with each other. Fixture jig 61 and printed circuit board 6 to be measured
Since the crank mechanism is used as the pressurizing mechanism (press unit) of No. 3, the pressurizing characteristic shown in FIG. . That is, pressurizing mechanism (press unit)
By adopting the crank function in the, the sin θ curve control can be realized, slow start and slow stop are possible, and as shown in Fig. 4, the pressurization characteristic with less impact during driving was obtained. It was possible to realize a necessary and sufficient pressing force while minimizing the stress applied to the printed board 63.

[0007]

As described above, the soft landing press unit according to the present invention can move in a short time while raising the safety to the surroundings with a low driving force during the descending operation in which it does not contact the printed board to be measured. It can be completed, the driving pressure is gradually increased after it comes into contact with the printed board to be measured, and it matches the pressure characteristics of the test probe embedded in the fixture, and at the same time, the measured print can be made at the same time. Achieves minimal stress on the board. The soft landing press unit according to the present invention can realize a necessary and sufficient pressing force by supplying the AC100V power source, so that restrictions on the installation place are alleviated.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a soft landing press unit according to the present invention.

FIG. 2 is a side view showing an embodiment of a soft landing press unit according to the present invention.

FIG. 3 is a characteristic diagram showing a moving distance and a pressurizing characteristic of the electric press.

FIG. 4 is a characteristic diagram showing movement time and movement speed characteristics of the electric press.

[Explanation of symbols]

9 Operation base 12 link support block 16 links 31 Sprocket A 32 Sprocket B 33 chains 40 clamp link 53 Motor with electromagnetic brake 61 fixture 62 Pressure top plate 63 Printed board under test 64 test probe

Claims (2)

[Claims] 1. A soft landing press unit used as an auxiliary device in an in-circuit test or a function test of a printed circuit board on which a component is mounted, the underside of an operation base constituting the soft landing press unit. A plurality of pressure top plates mounted vertically on the
The operation base connected to the upper end of the link that constitutes the crank mechanism is moved downward along with the linear movement of the working base, and the tip of the push rod arranged on the pressure top plate is pressed against the printed board to be measured to measure it. A soft landing press unit characterized in that the conductive part of the printed board and the test probe embedded in the fixture jig are pressed into contact with each other to minimize the stress applied to the printed board to be measured. 2. A crank shaft comprising: a rotating shaft of a sprocket that is decelerated by two sets of sprockets that are connected by a chain to rotational motion of an AC motor; and a lower end of a link whose upper end is connected to a central part of an operating base. By connecting via a link, a crank mechanism that converts the rotational motion of the sprocket into the linear motion of the tip of the push rod arranged on the pressure top plate is constructed, and sin θ curve control using this crank mechanism is fixed. The soft landing press unit according to claim 1, wherein the soft landing press unit is realized as a method of pressing a chuck jig and a printed board to be measured.