Description; Mechanics - Avery Dennison ALX 720 User Manual

Operators Manual
ALX 720

2. Description

This chapter explains the structure and the function of the 720 dispenser part. The expressions
used are explained here.
CAUTION! - The machine is connected to mains. Only authorised
personnel may open the cover. Operation without this cover is not
allowed.

2.1 Mechanics

The label material is unwound from roller (003). The maximum diameter of the label roll is 300
mm. Max. width is 100 mm. The material roll is guided by 2 removable plates (002). The guide
plate in front has to be pressed against the label roll. Behind the cap (004) of unwind mandrel
(003) an adjustment screw for the brake is located. The unwind brake avoids after run of the
label roll when the label drive stops. The dancer arm (011) keeps the material tight and the
acceleration forces low. The deviator roller (008) makes sure that the material is guided
correctly.
Note: For labels longer than 100 mm and in "side labelling applications" it is
recommended to use the optional available kit dancer arm controlled unwind brake.
This device avoids uncontrolled after run of label material. The brake should not be
fixed too tight, otherwise the motor may stall or the material web gets broken.
Behind the deviator roller (009) the material is guided to the printer unit. First it passes the both
opposite holder for the label sensor. The sensor could be positioned across the whole label to
get the optimised position. In one of the two red guides a sensor to detect end of material is
mounted. Behind the print unit the material is hold in a loop buffer. The loop is controlled by the
position of the dancer arm. If the loop is not filled, the printer starts to fill the loop again. At a
adjustable position all further starts of the dispenser are ignored. Behind the loop the material is
guided to the dispensing edge. The brush (006) keeps the material tight without disturbing the
movement. At the dispensing edge (010) the label sensor (007) is mounted. The label sensor
detects the gaps between labels. The label sensor comprises of a light source and a light
receiver. The sensitivity can be adjusted by the operators panel.
At the dispensing edge (010) the label is separated from the backing paper. By means of a soft
(005) roller the label is applied on to the product. Roller (012) makes sure that the material is
always guided properly around the dispensing edge. Drive roller (001) keeps the transport
speed of the material constant. Deviator rollers (012) guide the backing material around the
drive roller (001). The pressure mechanics (013) press the backing paper against the drive
roller (001).
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