80S-15贴片机 - 第351页

SIPLACE 80S/F/G Service Manual 9 Revolver Head Edition 04/97 9 - 67 Fig. 9.6.16 Incremental shaft encoder of the dR axis

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

Edition 04/97

9 - 66

9.6.10 Incremental Shaft Encoder of the dR Axis

The incremental shaft encoder of the dR axis supplies information concerning the current position of the

revolver head when the revolver head cycles the segments on from station to station. Once the required posi-

tion is reached the rotational movement of the revolver head is stopped. The position regulator then fixes the

revolver head in this position.

The resolution of the electronic positioning system of the dR axis is 200 digits per degree.

The incremental shaft encoder of the dR axis basically consists of the following components (see Fig. 9.6.16):

–

glass disk with 3600 lines for the position track and a zero pulse track

–

bearing bush: the glass disk is glued to the bearing bush in the factory.

–

2 deep-grooved ball bearing

–

light source with lens system and light source masks with 5 through-holes as encoder

–

opto-electronic scanning with 5 phototransistors

●

2 each for position tracks A and B

●

one for the zero pulse track

–

M5 hexagon socket-head screw for mounting the revolver head on the incremental shaft encoder. The

hexagon socket-head screw is varnished after the revolver head is fitted in the factory.

NOTE

During all servicing work, make sure that the glass disk does not get dirty or come into contact with solvents

otherwise there will be counting errors and thus positioning errors.

NOTE

As a rule it will only be possible to replace the revolver head in the factory since the varnished M5 hexagon

socket-head screw has to be removed.

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

Edition 04/97

9 - 67

Fig. 9.6.16 Incremental shaft encoder of the dR axis

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

Edition 04/97

9 - 68