JPH0352298A - Apparatus for positioning of electronic part - Google Patents

Abstract

PURPOSE:To prevent even small electronic parts from receiving great impact and damaging and improve the reliability of an apparatus by enabling changing the opening-closing stroke of parts holding claws to hold electronic parts for positioning. CONSTITUTION:The vertical stroke of an L-stick 7 can be changed by changing the position of a rod end 8 and thereby the rotation angle of an L-lever 4 and the opening-closing stroke of parts holding clews 1a and 1b can be changed. Therefore, the rod end 8 is set at the most appropriate position according to the shape and size of an electronic part 5 to be held to make the stroke of the parts holding claws 1a and 1b between the stopping position when open and the holding position for the electronic part 5 approximately constant. Thereby even a small electronic part 5 can be prevented from receiving strong impact and being damaged and the reliability of an apparatus is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electronic component positioning device used in a 2.1 electronic component mounting machine that mounts electronic components onto a printed circuit board.

[Prior Art] Conventionally, electronic component mounting machines have been known to suction and convey electronic components supplied from an electronic component supply device using a vacuum suction nozzle.
The electronic components are mounted on a printed circuit board. In this case, a positioning device is required to correct the position of the electronic components picked up by the vacuum nozzle before mounting them on the printed circuit board. This positioning device employs, for example, a structure in which an electronic component is held between two pairs of component gripping claws arranged at right angles to each other from four directions. The operation of opening and closing the component gripping claws is performed using a cam and a spring, as described in, for example, Japanese Patent Application Laid-open No. 155325/1983 or Japanese Utility Model Application No. 178540/1983. The opening/closing stroke is always set constant regardless of the size of the electronic component.

[Problem to be Solved by the Invention] In the conventional electronic component positioning device described above, when the electronic components to be positioned have different shapes and dimensions, the opening/closing stroke of the component gripping claw is adjusted to the electrical component with the largest size. It must be sized accordingly.9
In the case of such a large stroke, the opening/closing speed of the component gripping claws increases. For this reason, when it comes to small-sized electronic components, the speed of the gripping claws when contacting the component is high, causing a problem in that the impact force against the component becomes large and can damage the component. Ta. In particular, small-sized electronic components have a low impact strength, so they are more likely to break. As a measure to solve this problem, conventionally, two types of positioning devices with different gripping claw strokes have been selectively used depending on the maximum size of the electronic component, but the structure and operation are extremely complicated. The present invention attempts to solve the above problems. In other words, the present invention provides an electronic component positioning device that does not damage electronic components with impact force even when electronic components with different shapes and dimensions are targeted, and that can do so with a single device. The purpose is to provide

[Means for Solving the Problems] In order to achieve the above object, the electronic component positioning device of the present invention includes a component gripping claw that grips and positions an electronic component, and an opening/closing mechanism that opens and closes the component gripping claw. A variable stroke mechanism capable of varying the opening/closing stroke of the component gripping claw, a swinging source for moving the variable stroke mechanism, and a control device for controlling the amount of movement of the drive source.

[For production]

According to the present invention, the stroke amount from the state where the component gripping claws are open and stopped until the electronic component is gripped can be made almost constant in accordance with the shape and dimensions of the target electronic component, Therefore, even if the electronic components are small using the t method, a large i* impact force will not be applied to them, and there is no risk of damage.
It can be handled with one positioning device.

[Embodiment] FIG. 1 is an elevational view schematically showing a first embodiment of the present invention, and FIG. 2 is a plan view showing only a portion thereof.

The electronic component positioning device of this embodiment includes a component positioning section for correcting the position of the electronic component and a drive source for opening and closing the claws of the positioning section.

The component positioning section includes component gripping claws 1;i,1. b, and a block 2 to which these component gripping claws 1a and lb are attached separately.
a, . 2 b, the outer link 3 a p that connects the blocks 2 a and 2 b, the middle link 3 Q y, the outer link 3 b, the L-shaped lever 4, and the component gripping claw 1 a in the horizontal direction (direction toward the electronic component 5). ) is made up of a compression spring 6, etc.

The drive section includes an L-shaped rod 7 having a push-up head 7a, a rond end 8 fixed to the upper end of the L-shaped rod 7, a cam lever 9, and a cam lever 9 that slides the rod end 8 horizontally. The cam 1l is in contact with the cam lever 9, the stopper 12 is in contact with the rod end 8, the servo motor 13, and the servo motor]. 3, a ball screw machine 4 that moves the stopper 12 laterally by rotation, a control device 15 that controls the drive amount of the servo motor l3, and an L-shaped rod 7 that presses the end 8 against the stopper 12. It consists of an attached tension spring 16 and a tension spring 17 to which the cam reper 9 is attached in order to press the cam reper 9 into contact with the cam 1↓.

That is, in the component positioning section, component gripping claws 1a and 1b
are respectively attached to blocks 2a and 2b facing each other, the block 2a is pivoted to the block 2a by an outer link 3a and a pivot pin 3e, as also seen in Figure 52, and the block 2b is The middle link 3c, which is pivotally connected to the block 2b by an outer link 3b and a pivot pin 3g and is horizontally rotatable about a support shaft 3h, is different from the outer link 3a by a pivot pin 3d. and is pivotally connected to the outer link 3b by a pivot pin 3f.

When the L-shaped lever 4 rotates clockwise or counterclockwise in FIG. 1 about the fulcrum 4a, the blocks 2a and 2b move along arrows 2 in FIG. 2 along guides (not shown).
The electronic component 5 is moved horizontally as shown by 0 and 21, and the component gripping claws 1a and 1b therefore perform opening and closing operations, and in the closing operation, the electronic component 5 is gripped by the force of the compression spring 6 to correct the position of the electronic component 5.

In the drive section, the L-shaped rod 7 moves up and down as will be described later, and the push-up head 7a of the L-shaped rod 7 moves against the L-shaped lever 4.
The L-shaped lever 4 is rotated by pressing against the lower part of the lever. At this time, the vertical movement of the L-shaped rod 7 is the part gripping claw 1.
Corresponds to opening/closing steps 1 to 1 of opening/closing a and lb. A rod end 8 is fixed to the upper tip of the L-shaped rod 7, and the rod end 8 slides left and right in a horizontally long groove 10 provided in a cam lever 9 that rotates vertically about a fulcrum 9a. It is possible to move. The cam lever 9 is pressed against the cam l1 by a tension spring 17, and by the rotation of the cam ↓, the L
The shaped rod 7 moves up and down as shown by arrow l9.

The vertical stroke of the L-shaped rod 7 can be varied by changing the position of the rod end 8 from side to side within the groove 10. The position of the rod end 8 can be arbitrarily varied by controlling the position of the stopper 12 by moving the stopper 12, which is actuated by a servo motor 13 and a ball screw 14, as shown by an arrow 18.

The amount of movement of the servo motor 3 is set in the control device 15 according to the dimensions of the electronic components stored in advance.

In this way, by changing the position of the rod end 8, the magnitude of the vertical stroke of the L-shaped rod 7 can be changed, and thereby the rotation angle of the L-shaped lever 4 can be changed, and the component gripping claws 1a, The opening/closing stroke of Lb can be changed. Therefore, the position of the rod end 8 is selected to be optimal in accordance with the shape and dimensions of the target electronic component, and thereby the electronic component 5 is By keeping the stroke amount until the grip is approximately constant, it is possible to prevent damage to even small electronic components by preventing large impact forces from being applied to them.

In the first embodiment, the servo motor 13 is used for parking, but a pulse motor or an opening device that can change the stopping position intermittently may also be used.

FIG. 3 shows a second embodiment of the invention. In this second embodiment, the L-shaped rod 7 and rod end 8 shown in the first construction drawing are
The elevating member 22 having a push-up head 22a is moved up and down directly by a ball screw 14 rotated by a servo motor 13 without using a cam lever 9, a cam 11, a stopper 12, or a tension spring 16. According to this second embodiment, not only the strokes of the component gripping claws 1a and 1b but also the component gripping claws 1 at a position slightly outside the tolerance of the electronic component 5.
It is possible to stop the opening of a, lb, and therefore,
It is possible to minimize the impact force on the electronic component 5 when the electronic component 5 is held.

In this second embodiment as well, a pulse motor or other heel motion device may be used as the power source.

[Effects of the Invention] As described above, according to the present invention, the opening and closing strokes of the component gripping claws that grip and position electronic components can be made variable, so that The stroke amount from when the component gripping jaws are open and stopped until they grip the electronic component can be kept almost constant, so even small electronic components can be gripped.
The reliability of the device is improved because no large impact force is applied and no damage occurs. Furthermore, since electronic components of different shapes and sizes can be handled with this one positioning device, the versatility is also improved.

[Brief explanation of drawings]

FIG. 1 is an elevational view schematically showing the first embodiment of the present invention;
FIG. 2 is a plan view showing only a part of FIG. 1, and FIG. 3 is an elevational view showing a second embodiment of the present invention. la, lb... Part gripping claws 3a, 3b... Outer link 3o... Middle link 5... Electronic component 7... L-shaped rod 9... Cam lever 1↓... Cam 13. ... Servo motor l5 ... Control device 16.17 ... Tension spring 4 ... L-shaped lever 6 ... Compression spring 8 ... Rod end 10 ... Oblong groove 12 ... Stopper 4. ... Ball screw 22 ... Lifting member

Claims (1)

[Scope of Claims] 1. A component gripping claw for gripping and positioning an electronic component, an opening/closing mechanism for opening and closing the component gripping claw, a variable stroke mechanism for making the opening/closing stroke of the component gripping claw variable; An electronic component positioning device comprising: a drive source that drives a variable stroke mechanism; and a control device that controls the amount of drive of the drive source. 2. Electronic component positioning according to claim 1, wherein the opening and closing strokes of the component gripping claws are controlled by controlling the drive source based on information corresponding to the dimensions of the electronic component stored in advance by the control device. Device.