Avery Berkel CX20 SERIES, Service Manual

Page: 203 / 353

20 — Label and Receipt Printer
20–3 CX20/CX30/CX34 Service Manual
Figure 20.1 Label and Receipt Printer (CX20/CX30)
Spring (take–up
spool)
Screw (for secur-
ing retaining plate)
Retaining
plate
Cassette
Roller (print head)
Sensor (optical photodetector)
Drive belt
Pulley (print head roller)
Pillar (stepper motor)
Screw (securing pillar
to stepper motor)
Stepper motor and
loom assembly
Motor and gearbox assembly
(take–up motor)
Pillar (take–up
motor)
Loom (print
head)
Spine
Cross protection
plate
Printer assembly
(Rohm)
Label (paper feed
instructions)
Take–up
spool
2–off corner stops
(CX20/CX30 only)
20.1 Description
The printer described in this section is complete with unit spine and top plate.
On the CX20/CX30 the unit spine also carries two of the four corner stops,
which act as asymmetric overload stops for the cross assembly of the unit: these
are adjusted as part of the unit calibration (refer to Section 7).
The printer is a versatile unit, being able to print thermal paper tickets and
self–adhesive, thermal labels in a variety of sizes. It uses a thermal print head,
two electric motors, and a photodetector sensor mechanism. A plastic cassette
provides a housing for a ticket roll.
The cassette is interchangeable, so that an operator may carry a number of
cassettes each loaded with different types of ticket roll. For example, one might
carry a roll of self–adhesive labels and another might carry continuous paper.
This enables an operator to change the printing function quickly and easily,
without any need to unload the existing paper roll from the cassette.