Service Manual HS60.pdf - 第95页

HS -60 Se rvic e Manu al 4 Ga ntr ies 03/ 200 3 U S Iss ue 4. 2 S truc tu re of th e gan tr y 93 4.2 Structu r e of th e gantry The principal element of the gantry is the t orsion ally r igid precision-cast gantry . Figu…

4 Gantries HS-60 Service Manual

4.1 Overview 03/2003 US Issue

The structure of the gantries makes them very torsionally rigid. Precise mechanical movements

of the axes are produced by axis recirculating ball screw units. 4

High-precision positioning systems determine the positions of the x and y axes. To do this, the

graduations on metal scales are optoelectronically scanned and the track signals are sent to the

axis control in the control unit. 4

Direct drive units are used to position the placement heads in the x and y directions. This elimi-

nates friction losses, for example, which are typical when complex gearing is used. In addition,

there is none of the wear that can significantly affect the accuracy of positioning systems over the

course of time. 4

X-axis drive 4

A toothed belt is used to convert the rotary movement of the turning motor for the X-axis directly

into a translatory movement of the placement head in the x direction. 4

Y-axis drive 4

The translatory movement of the placement head in the y direction is generated by a linear mo-

tor. 4

HS-60 Service Manual 4 Gantries

03/2003 US Issue 4.2 Structure of the gantry

4.2 Structure of the gantry

The principal element of the gantry is the torsionally rigid precision-cast gantry. Figure

4.2 - 1

contains a plan view of its major components. 4

Fig. 4.2 - 1 Structure of the gantry - plan view

Key

(1) Precision-cast gantry (2) Head mount

(3) Incremental encoder for Y-axis scale (4) Primary part of the y linear motor

(5) Motor bracket (6) Thrust bearing

(7) X-axis motor unit (8) Toothed belt

(9) Deflection unit (10) Y-axis brake, external

(11) Y-axis brake, internal (12) Proximity switches B1 and B2 for the Y-

axis

4 Gantries HS-60 Service Manual

4.2 Structure of the gantry 03/2003 US Issue

Figure 4.2 - 2

shows a bottom view of the gantry. 4

Fig. 4.2 - 2 Structure of the gantry - bottom view

Key

The gantry is fixed to the two shuttles (see item 1 in Fig. 4.2 - 3

) of the recirculating ball screw unit

(see item 2 in Fig. 4.2 - 3

) using four M6 x10 hexagon socket-head screws. 4

The secondary part (see item 3 in Fig. 4.2 - 3

) of the Y-axis linear drive, with its permanent mag-

nets, is located above the guide rail of the recirculating ball screw unit. The secondary part is

mounted on the machine frame. 4

The air and power supply and signal lines for the gantry and collect&place head all run in a trailing

cable (see item 1 in Fig. 4.2 - 4

). 4

(1) Head mount

(2) X-axis brake

(3) PCB camera with lens system

(4) Incremental encoder for the X-axis

(5) Recirculating ball screw unit KUME 12B

(6) Scale for the X-axis

(7) End position proximity switch 2

(8) End position proximity switch 1 and reference point for the X-axis

(9) Elastomeric spring 25x10.5x50