SU917374A1 - Device for mounting electronic components onto printed circuit board - Google Patents

Description

(S) DEVICE FOR INSTALLING RADIO ELEMENTS ON A PCB

The invention relates to paflMOtexnik, and more specifically to technology and equipment for the manufacture of radio equipment. A device for installing radio elements on a printed circuit board containing a collet clip connected to a gear-rack-and-pinion gear drive Cll is known. However, the known device does not provide high-quality installation of radio components. The purpose of the invention is to improve the quality of the installation of radio elements. This goal is achieved by the fact that in a device for mounting radio elements on a printed circuit board containing a collet chuck with a pusher coupled to a rack and pinion drive, the collet chuck is fixed to the gear axis of the sprocket-chord gear. rotational movement, with one of the rails of the gear drive connected to the sleeve of the collet clamp. In order to increase the reliability of operation, the ejector is positioned between the jaws of the collet chuck and connected to a rack and pinion drive. The drawing shows the device, the overall appearance. The device consists of a pin-clamping clamp, including sponges 1 and 2, on the working surfaces of which prismatic grooves are made, a tapered sleeve 3 rigidly connected to the rack 4 of a toothed-belt transmission, which also includes a rail 5 connected to the main drive (for example, pneumatic actuator reciprocating movement of the machine on which the device is used), and a gear wheel 6 mounted inside the collet clamp of a spring-loaded pusher 7, controlled cam 8, gesture 39

mounted on the shaft E of the toothed wheel 6. The jaws 1 and 2 of the collet chuck are fixed on a fork 10, which is also rigidly seated on the shaft 9. The device is also equipped with a centering ring 11 intended to center ry6ok 1 and 2. relative to the holes of the printed circuit board, and the transistor 12 moves along the guides 13, the ejector is equipped with a spring H, and a spring 15 and 16 is attached to the rack and pinion shaft. The rail 5 interacts with the pawl 17.

The device works as follows.

In the initial position, the collet chuck is horizontal or tilted at some angle. The radio element (transistor) 12 from the nutrient device with single-piece delivery (not shown) along the fixed guide 13 enters the additional seal to the elongated portion of the jaws 1 and 2, which overlap each other. The body of the transistor in this case rests on a plate attached to the bottom of the jaws. As the rail 5 moves downward, the gear wheel 6 rotates counterclockwise with the shaft 9 and the cam 6. The gear wheel 6 moves the rail k and the taper sleeve 3. associated with it 3. to the left. At. This jaws 1 and 2 converge and prismatic grooves center the output of the transistor to the established center-to-center distance. At the same time, the cam 8 releases the plunger 7, which under the action of the springs T moves to the left and presses the transistor 12 body through the elastic element to the guide 13, basing it on the lower plane of the housing. Further compression of the jaws 1 and 2 ensures that the extreme leads are bent to the right and the central one to the left of the symmetry axis of the transistor. The free part of the pins remains parallel to the transistor case. At the end of the compression of the jaws 1 and 2, the cam 8 pulls the pusher 7 away from the transistor 12. After further movement of the rail 5, the resistance of the spring 15 and the plug TO, on which the collet clamp is fixed, is turned counterclockwise, in a vertical position until it stops. The rail 5, moving further down, overcomes the resistance of the spring 16 and moves the entire system together with the shaft 9 down. Body collet

374,

Goes to centering ring T1, a. the leads of the transistor 12 - in the hole on the board. All inaccuracies in the manufacture of parts and play in the joints

are compensated when basing the collet body in the ring 11. At the end of the stroke of the shaft 9, a spring-loaded pawl 17 s. The fixed axis of rotation engages the shaft 9 and holds it in the edge of the lower position.

When the rail 5 moves upward, the gear wheel 6 rotates clockwise with the shaft 9, the rail k moves with the tapered sleeve 3 up, the jaws 1 and 2 attached to the leaf springs disperse, releasing the output of the transistor 12. At the same time, the plunger 7, released by cam 8, under the action of springs k presses against the body. transistor 12 and sends it all the way to the PCB. At the end of the divergence of the jaws 1 and 2, the rail 5 pushes the pawl 17 away and releases the shaft E, which under the action of the spring 16 and the rail 5 moves upwards, the collet body exits the centering ring 11. A translational movement of the shaft 9 occurs together with the collet extreme top position. At the end of the stroke of the rail 5 upwards, the entire system is rotated clockwise to its original position until it stops.

Claims (2)

1. A device for installing radio elements on a printed circuit board containing a collet chuck with a pusher connected to a drive in the form Q gear rack and pinion gear, characterized in that, in order to improve the quality of the installation of radio elements, the collet clamp is fixed on the gear-rack gear axis with the possibility of returning and rotating movement, and one of the gear-rack gear bars is connected to the collet of the collet clamping. 2. The device according to claim 1, about t l and so that, with the aim  increase the reliability of work, the ejector is placed between the jaws of the collet chuck and connected with a gear-rack drive. 55 Sources of information taken into account in the examination 1. USSR author's certificate No. 790387, cl. H 05 K, 1979 (prototype).