RU2032999C1 - Gear to position microcircuits on surface of printed circuit boards - Google Patents

Abstract

FIELD: electronics. SUBSTANCE: invention is designed to provide high reliability of feed of microcircuits with leads of "gull wing" type from dispenser to working position of centering devices. Specified aim is achieved by manufacture of cut-off device in the form of two mobile cams interacting with leads of microcircuit. They are fitted with mechanisms of synchronous and mirror turning and cut-off gate is mounted for interaction with front cam. EFFECT: high reliability of feed of microcircuits. 13 cl, 6 dwg

Description

 The invention relates to the automation of the assembly of printed circuit boards.

 A device for loading parts is known, which is capable of providing piece-by-piece feeding of parts to a working position with the help of a gate acting as a cutter. This device (and similar devices) is not able to reliably provide piece-by-piece delivery of microcircuits with leads of the "Seagull wing" type due to thin leads (0.1-0.3 mm), which can and get stuck with a variable gap between the gate and the store wall . The gap does not remain constant due to the variation in the thickness of the microcircuits.

 It is impossible to feed microcircuits from the bunkers along vibration trays, since microcircuits clutch in the path and damage the terminals.

 Boot devices made in the form of cells, from which special captures select chips in turn and deliver to a given point, are quite complicated, because correcting video systems are necessary for their reliable operation.

 The aim of the invention is to increase the reliability and performance when installing microcircuits with conclusions such as "Seagull wing".

 This goal is achieved by the fact that the cutter is made in the form of two cams interacting with the terminals of the microcircuit, the axis of the cams are located in the same plane, the gate is installed to interact with one of the cams, which is connected to the other cam by a mechanism of synchronous and mirror rotation, the cams are equipped with stops , the synchronous and mirror rotation mechanism is made in the form of gear sectors engaged with each other and connected with cams, the synchronous and mirror rotation mechanism is made in the form of oromyshl connected with cams, and other ends articulated between each other by a thrust. In addition, the store is equipped with a bottom, which is made with a hole, the bottom of the store is installed in parallel grooves made in the opposite side walls of the store perpendicular to the channel axis, the store in the lower part is equipped with two side guides fixed with protrusions. The axis of the cams are mounted on the side rails, on opposite sides of the magazine relative to the direction of movement of the gate. The device is equipped with an additional pair of cams mounted on two other sides, and a mechanism for their synchronous rotation with the first pair and mirror between them, the cams are spring-loaded in the initial position, the cam and axes are made as one part.

 In FIG. 1 shows a device in section; figure 2 shows the action of the gate on the cams, cams on the terminals of the microcircuit, as a result of which the last microcircuit is free for its subsequent movement by the gate; in FIG. 3 the microcircuit is advanced to its working position, the gate is in the rightmost position and its front edge fixes the position of the microcircuit; figure 4 is a top view of the device in the initial position. The axles are pivotally mounted on the side rails. Rigidly fixed on the axes cams and gear sectors that are engaged; figure 5 disclosed the mechanism of synchronous and mirror rotation of the cams with protrusions.

 The device comprises a housing 1, on which a magazine 2 with side rails 3 with axles 4 mounted on them pivotally mounted on them, on which cams 5 and gear sectors 6 are mounted, the bottom of the magazine 7, on which the column of microcircuits 8 is located, has a gate 9 with a drive mechanism on the left (last not shown).

 The device operates as follows. The gate 9, moving to the right, rotates the front cam 5, which is engaged by the mechanism of synchronous and mirror rotation with another cam opposite. Cams pick up the penultimate microcircuit for the outputs and, together with it, raise the remaining microcircuits in the store.

 Next, the gate valve pushes the microchip to the conditional working position in the drawing, for example, under the pusher, indicated conditionally in figure 3.

 Calculations show that in the proposed solution, when lifting a column of microcircuits using cams interacting with the terminals of the penultimate microcircuit, the latter does not damage these conclusions.

где G вес одной микросхемы;
m количество микросхем;
l плечо, вылет вывода;
n число выводов одной микросхемы;
h толщина вывода;
b ширина вывода.The voltage at the terminals, in the area near the housing, can be calculated according to the circuit shown in Fig.6, and the formula
σ

where G is the weight of one chip;
m number of microcircuits;
l shoulder, departure pin;
n is the number of pins of one chip;
h output thickness;
b output width.

 When substituting the parameters of a particular microcircuit in the formula, you can see that the voltage in the terminals does not exceed the permissible ones, when the number of microcircuits is comparable to the height of the store adopted in practice, while the number of microcircuits is much larger than in cell structures, and this is a gain in area.

Claims (13)

 1. DEVICE FOR MOUNTING ON THE SURFACE OF THE PRINTED CIRCUIT OF CIRCUIT ICS WITH TERMINALS OF THE TYPE "WING OF A SEAGUE", comprising a housing, a magazine with microcircuits, a gate with its drive mechanism, a cutter, characterized in that, in order to increase reliability, the cutter is made in the form of two movable interacting with the outputs of the cam chip with a synchronous and mirror rotation mechanism, and the gate is installed with the possibility of interaction with one of the cams.  2. The device according to claim 1, characterized in that the cams are provided with stops.  3. The device according to PP.1 and 2, characterized in that the synchronous and mirror rotation mechanism is made in the form of gear sectors, placed with the possibility of engagement with each other and connected with the cams.  4. The device according to claims 1 and 2, characterized in that the synchronous and mirror rotation mechanism is made in the form of rockers connected to cams, and other ends pivotally connected to each other through a rod.  5. The device according to PP.1 to 4, characterized in that the store is made with a bottom.  6. The device according to p. 5, characterized in that a hole is made in the bottom of the store.  7. The device according to PP.5 and 6, characterized in that the bottom of the store is placed in parallel grooves made in the opposite side walls of the store and located perpendicular to the channel axis.  8. The device according to PP.1 to 7, characterized in that the store in the lower part is equipped with two side rails, fixed with protrusions.  9. The device according to PP.1 to 8, characterized in that the axis of the cams are mounted on the side rails.  10. The device according to PP.1 to 9, characterized in that the cams are installed on opposite sides of the store with respect to the direction of movement of the gate.  11. The device according to paragraphs. 1 to 10, characterized in that the device is equipped with an additional pair of cams mounted on two other sides of the store, and a mechanism for their synchronous rotation with the main pair of cams and mirror between them.  12. The device according to PP.1 to 11, characterized in that the cams are spring-loaded.  13. The device according to claims 1 to 12, characterized in that each cam and axis are made in the form of one part.

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