Star Micronics PR921-24-A User manual

PRESENTER UNIT
PR921-24-A
SPECIFICATION MANUAL

NOTICE
• All rights reserved. Reproduction of any part of this manual in any form whatsoever, without STAR’s
express permission is forbidden.
• The contents of this manual are subject to change without notice.
• All efforts have been made to ensure the accuracy of the contents of this manual at the time of going to
press. However, should any errors be detected, STAR would greatly appreciate being informed of them.
• The above notwithstanding, STAR can assume no responsibility for any errors in this manual.
Copyright 2002 Star Micronics Co., LTD.

CONTENTS
1. GENERAL DESCRIPTION ................................................................................................................ 1
1.1 Model Name Display Directions ............................................................................................. 1
2. PRINTER CONFIGURATION........................................................................................................... 2
3. PAPER SPECIFICATIONS (HEAT SENSITIVE PAPER)............................................................. 3
4. PRESENTER SPECIFICATIONS...................................................................................................... 4
4.1 Basic Operations ...................................................................................................................... 4
4.2 Operating Sequence ................................................................................................................. 4
4.3 Paper Detector General Specifications .................................................................................... 8
4.4 Presenter Motor General Specifications .................................................................................. 9
4.5 Connector............................................................................................................................... 10
5. EXTERNAL SPECIFICATIONS ..................................................................................................... 12
6. AMBIENT SPECIFICATIONS......................................................................................................... 15
7. RELIABILITY SPECIFICATIONS ................................................................................................. 16
8. SETTING PAPER............................................................................................................................... 17
8.1 Setting Paper .......................................................................................................................... 17
8.2 Using the Accessories (Weight Shaft and Loop Guide) ........................................................ 18
9. RECOVERING FROM ERRORS (PAPER JAMS) ....................................................................... 21
10.PRECAUTIONS REGARDING OUTER COVER DESIGNS ...................................................... 23
11.MAINTENANCE ................................................................................................................................25
12.OTHER PRECAUTIONS .................................................................................................................. 26
12.1 Precautions in Handling ......................................................................................................... 26
12.2 Precautions Relating to Safty................................................................................................. 26

– 1 –
1. GENERAL DESCRIPTION
The PR921 is a paper (receipts, etc.) discharging device that uses a built-in thermal printer system employed
in electronic devices such as game machines, ATM and unmanned information kiosk terminals, etc.
This model carries a paper (receipts, etc.) recovery function after discharge, as a standard.
1.1 Model Name Display Directions
P R 9 2 1 - 24 - A
1 234 5 6
1PR : Presenter
29 : 900 Series
32 : No cutter, horizontal discharge
41 : Standard (Used with TMP)
524 : DC 24 V Specifications
6A : Sold Separately

–2 –
2. PRINTER CONFIGURATION
The presenter mechanism is composed of the following devices.
Presenter Mechanism Drive Unit PF Roller
Detector Paper Detector 1 (Reflective Photo-interrupter)
Paper Detector 2 (Reflective Photo-interrupter)
Paper Detector 3 (Reflective Photo-interrupter)

– 3 –
3. PAPER SPECIFICATIONS (HEAT SENSITIVE PAPER)
(1) Paper Width : 79.5 ±0.5 mm to 111.5 ±0.5 mm
(2) Allowable Sheet Length : 75 to 300 mm
(3) Recommended Heat Sensitive Paper : According to product specifications for TMP942-24-A.
(4) Paper Thickness : 0.065 mm to 0.150 mm
(5) Shaft Core Diameter : When paper thickness is Min. 0.065 mm to 0.10 mm
Shaft core inner diameter: Min. 25.4 ±1 mm;
Shaft core outer diameter: Min. 31.4 ±1 mm
When paper thickness is Min. 0.10 mm to 0.15 mm
Shaft core inner diameter: Min. 50.8 ±1 mm;
Shaft core outer diameter: Min. 56.8 ±1 mm
(6) Paper Curl Direction : Set the paper so that the printing side is facing the outside when taken up
on the roll.
Note 1: Paper jams can occur if paper outside of the specifications describe above is use.
(7) Non-printing Region on Back Side :
Note 2: When using paper outside of the specifications describe above, the paper
detector(sensor) may mis-detect the paper or may not detect the paper at all.
25 mm
10 mm
Paper back side
Non-printing region (Back side)
The front side of the
paper is the printing surface.
Paper discharge direction
79 mm
(Minimum paper width)
112 mm
(Maximum paper width)
Center of presenter paper discharge outlet

–4 –
4. PRESENTER SPECIFICATIONS
4.1 Basic Operations
a. Paper is not discharged from the printer while printing.
b. After printing is completed, the presenter roller rotates to discharge the paper.
c. The roller stops when the detector has detected the trailing edge of the paper.
(Paper discharge completed)
d. The next print job can be started by the user removing the paper from the printer.
e. The recovery command or a timer can be used to recover the paper if it is not removed.
4.2 Operating Sequence
Paper Feed Direction
PF Roller
Recovery
Direction
PF Roller
Presenter Inlet
Presenter Inlet
Paper Position
Presenter Outlet
Presenter Outlet
Sensor 3 Sensor 2
Sensor 1 Sensor 2 Sensor 3
Sensor 1
Sensor 1: Sensor for detecting leading edge and trailing edge of paper.
Sensor 2: Sensor for detecting leading edge of paper.
Sensor 3: Sensor for determining recovery
30. 6 mm
(63.6 mm)
13.1 mm 7.2 mm
7.8 mm 4.9 mm

–5 –
(1) Paper is discharged and the trailing edge of the paper is stopped in front of the PF roller.
200 ms
Presenter Inlet Presenter Outlet
CW 2
1
4
3
CCW
ON
OFF
ON
OFF
Paper Position
Terminal Shorted and
Motor Stopped
No Discrimination
DC Motor
Sensor 1
Sensor 2
Sensor 3
1Sensor 1 detects leading edge of paper and sensor 1 turns ON.
2Sensor 1 turns ON, DC motor starts rotating clockwise.
3Sensor 2 detects leading edge of paper and sensor 2 turns ON.
4Sensor 2 turns ON, DC motor is braked for 200 ms and stopped.

–6 –
200 ms
Presenter Inlet Presenter Outlet
CW 58
7
6
CCW
ON
OFF
ON
OFF
Paper Position
Terminal Shorted and
Motor Stopped
No Discrimination
DC Motor
Sensor 1
Sensor 2
Sensor 3
(2) Paper Discharge Until Paper Trailing Edge is Stopped Before PF Roller
5DC motor rotates clockwise by the paper discharge instruction.
6Sensor 1 detects trailing edge of paper and sensor 1 turns OFF.
7Sensor 1 turns OFF, paper is fed 1.2 mm.
8After feeding paper 1.2 mm, DC motor is braked for 200 ms and stopped.
Note: The amount of time required for feeding paper 1.2 mm in step 7, above, is logically 4 ms
with a paper discharge speed of 300 m/s.

– 7 –
200 ms
Presenter Outlet Presenter Inlet
CW
12
11
10
26 ms
1 s
9
CCW
ON
OFF
ON
OFF
ON
OFF
Paper Position
Terminal Shorted and
Motor Stopped
Sensor 3 turns OFF, then, if sensor 2 turns OFF,
it is determined that the paper has been
recovered. Under all other conditions, it is
considered that paper has been pulled out.
DC Motor
Sensor 1
Sensor 2
Sensor 3
(3) Paper Recovery Operation
If the sensor 2 and sensor 3 detection signals are ON after a determined amount of time has passed,
the paper recovery operation is performed.
9DC motor rotates counterclockwise by the paper recovery instruction.
0Sensor 3 detects trailing edge of paper and sensor 3 turns OFF.
ASensor 2 detects trailing edge of paper and sensor 3 turns OFF.
B1 second after sensor 2 turns OFF, DC motor is braked for 200 ms and stopped.
Note: The distance between sensor 2 and sensor 3 is 7.8 mm. Therefore, the amount of time
required for sensor 2 to turn OFF after sensor 3 turns OFF is 26 ms. It is necessary to
enable detection in that amount of time.