SU766715A1 - Device for continuously making rings - Google Patents

Description

one

The invention relates to the manufacture of rings of twig solder and can be applied to obtain doses of solids of a ring shape of a particularly small size.

Along with other soldering technologies (e.g., "wave"), group soldering in the coolant is widely used to provide local contact of the third-generation PCB.

A device is known for continuously making rings of wire 1. In this device, the wire is fed to a mandrel through a die. The screw surface of the mechanical cam turns when the mandrel is rotated moves by the pitch. Together with the mandrel, a sleeve is rotated in which a radial groove is made with a spring-loaded knife mounted therein, which, pushing against the roller, moves to the center. When the knife moves, the cutting edges cut the coil from the coiled helix.

However, due to the immersion of the wire, the rings are formed with a gap between the ends.

A device equipped with a spindle mounted on two supports is known.

a cantilever end of which is provided with a replaceable mandrel for winding a wire onto it. The head is put on the mandrel mounted with the possibility of axial movement 2.

The wire enters the mandrel, comes off of it due to the interaction with the spherical surface of the nozzle rigidly connected with the head, is wound onto the mandrel and advances along it due to the movement of the head.

10 At each turn of the spindle protrusion

the head interacts with the ball, while the next turn is cut by a knife rigidly connected to the mandrel.

To limit the winding sequence at the moment of compression of the spring by the head, an arcuate covering head was used to swing the rocker arm, which rotates around the axis, retracing the peephole with wire, thereby terminating the wire winding on the mandrel.

20 A disadvantage of the known device is the impossibility of cutting rings of small diameter from a bar solder, especially tin-lead, since, due to the fluidity of the alloy, the supply of coils with

The spherical mandrel will occur with deformation of the coils.

The aim of the invention is to improve the quality of the rings produced in the manufacture of bar solders.

This is achieved by the fact that in a device for continuous production of rings, comprising a housing mounted on a rotating stem, a mandrel with a knife rigidly fixed on it, the mechanism for feeding the rings to a knife is made in the form of a spring-loaded lever with shock absorber fixed on the housing, On the drive axis, two rigidly connected cams are installed, successively interacting with the pinch through the pulley and with the lever through the plunger.

The shock absorber is made in the form of a diluted dovetail and provides a smooth flow of a coil, in contact with its end surface.

A spring-clip is installed on the lever, which provides for winding the helix in one row.

FIG. 1 shows an example of a specific embodiment of the specified device; ar fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one.

The device has a housing 1 with a spindle 2 mounted on two bearings, a pulley 3 fitted on it with a rubber ring 4 interacting with the cam 5 to transmit a rotating movement from the drive, for example, an electric motor to the spindle.

At the end of the rod 2, a replaceable mandrel 6 of round, square or other cross-section is fixed for wound onto it of bar solder. The mandrel passes through the hole of the lever 7 and the shock absorber 8 mounted on the lever. The lever 7, when interacting with the cam 9 through the pusher 10 and the spring 11, is capable of reciprocating motion.

To cut the turns of the solder bar 12, which come from the mandrel 6, a knife 13 is mounted on it, rigidly connected to the mandrel.

To feed the blade 13 turns of the helix bar spiral, the lever 7 performs a reciprocating movement. A guide element 14 is mounted on the housing 1 through which a solder rod is fed.

Two rollers 15 and 16 are installed for trimming cut-off rings moving from the mandrel.

The lever 7, in conjunction with the shock absorber 8, is secured by a winding limiter in the form of a clip 17. The gap between the limiter and the mandrel 6 is set to less than two bar diameters, which ensures the spiral winding in one row.

The described device operates as follows.

The bar through the guide element 14 enters the mandrel 6, during rotation of which it is wound on it with coils and advances along the mandrel to the knife 13 by moving the lever 7 with the shock absorber 8. The spindle 2 receives rotation from interacting with the cam 5 only for winding one turn of the helix and then stops and at this moment the cam 9 interacts with the lever 7 through the pin, advancing the helix to the knife 13, which cuts off

turn, and the lever with the help of a spring 11 returns to its original position. The cut rings fall through the straightening rollers 15 and 16 into the hopper.

The use of the device allows to mechanize the dosing of solder during

 soldering of printed circuit boards for third-generation computers, as well as increasing the reliability of the dosage of solder.

Claims (3)

Invention Formula . 1. A device for continuous production of rings, comprising a drive disposed in the housing, a spindle with a pulley, a mandrel mounted in the spindle, at the end of which a knife is fixed and a mechanism for feeding the rings to the knife, characterized by 0 that, in order to expand technological capabilities and improve the quality of the rings, the mechanism for feeding the rings to the knife consists of a spring-loaded lever with a shock absorber mounted on the housing with reciprocating movement mounted in a push housing and two cams fixed with an axis interaction with the spindle through the pulley and with the lever through the pusher. 0 2. A device according to claim 1, characterized in that the shock absorber is made of spring material in the form of a diluted dovetail tail. 3. The device according to PP. 1 and 2, characterized in that a lever is placed on the lever, which is made in the form of a clip from a spring material. Sources of information taken into account in the examination 1. USSR author's certificate number 411947, cl. In 21 F 1/96, 1973. 2. USSR author's certificate number 421421. cl. B 21 F 37/00, 1974.