80S-15贴片机 - 第300页

9 Revolver Head SIPLACE 80S/F/G Service M anual Edition 04/97 9 - 16

SIPLACE 80S/F/G Service Manual 9 Revolver Head

Edition 04/97

9 - 15

9.3.4 Ejection optimization with vacuum error

If the vacuum test at revolver head station 1 indicates a pick-up error for a component, the gantry moves the

revolver head to over the collecting container. The segment is cycled on from revolver head station 1 to

revolver head station 3. Any component which may be present is ejected and the segment closed. The seg-

ment is then cycled on from revolver head station 3 to revolver head station 1. The gantry moves the revolver

head back over the transportation area. The revolver head picks up a fresh component. If this again is not

successful, the revolver head cycles the segment on. The pick-up error is added to the "Not done" list and the

component, if present, ejected during the repairs cycle.

9.3.5 Repairs Cycle

If mechanical and optical centering errors, CRDL testing errors and vacuum errors have occurred during the

pick-up and placement cycle, the component is added to a "Not done" list. Once the placement cycle is fin-

ished, all defective components will be ejected. In the repairs cycle all components which have been added to

the "Not done" list will be inserted.

9 Revolver Head SIPLACE 80S/F/G Service Manual

Edition 04/97

9 - 16

SIPLACE 80S/F/G Service Manual 9 Revolver Head

Edition 04/97

9 - 17

9.4 Description of the Function "Forced Air"

With segment versions E5 and higher the components are no longer ejected from the nozzle with the pusher

but are separated from the nozzle by a short blast of compressed air.

This new method has been introduced mainly for the following reasons:

–

In the case of small components of size 0402 no reasonable ratio could be achieved technically between

the pusher needle diameter and the nozzle walls which would yield economically acceptable service life for

pusher needles and nozzles.

–

Precision of placement and placement performance can be improved with this new method.

–

From segment version E6, nozzles of different lengths can be used. In this way, with long nozzles the

placement shadow can be considerably reduced. In addition, this new technique removes the necessity of

changing pushers.

9.4.1 Mechanical Construction of the Function "Forced Air"

The valve block for the forced air function in the placement and ejection circuit is located directly below the

conversion board "small axis" 1710460-Y0005 (see Fig. 9.1.1) and is mounted on the head mounting of the

gantry. Fig. 9.4.1 shows the structure of the valve block. The compressed air is fed via the quick-release cou-

pling to the valve block. The micro relay valves feed the forced air into the placement circuit or ejection circuit

in order to separate the components from the nozzle.

The micro relay valve for the placement circuit is closest to the revolver placement head. Using the adjustable

restrictor valves you can adjust the strength of the forced air flow in the placement and ejection circuits. The

forced air is injected into the circuit in question by means of two fork distributors. Please refer to the adjust-

ment instructions for the on-times of the micro relay valves and the strength of the compressed air flow.