prEN ISO 19085-21

SLOVENSKI STANDARD
01-november-2024
Lesnoobdelovalni stroji - Varnost - Krožne žage - 21. del: Dvolistne krožne žage za
prečni rez z vgrajenim podajalnikom
Woodworking machines - Safety - Part 21: Double blade circular sawing machines for
cross-cutting with integrated feed (ISO/DIS 19085-21:2024)
Sicherheit von Holzbearbeitungsmaschinen - Kreissägemaschinen - Teil 9:
Doppelgehrungskreissägemaschinen mit mechanischem Vorschub und
Handbeschickung und/oder Handentnahme
Machines à bois - Sécurité - Partie 21: Machines à scier à deux lames de scie circulaires
pour tronçonnage avec avance mécanisée (ISO/DIS 19085-21:2024)
Ta slovenski standard je istoveten z: prEN ISO 19085-21
ICS:
13.110 Varnost strojev Safety of machinery
25.080.60 Strojne žage Sawing machines
79.120.10 Lesnoobdelovalni stroji Woodworking machines
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 19085-21
ISO/TC 39/SC 4
Woodworking machines — Safety —
Secretariat: UNI
Part 21:
Voting begins on:
Double blade circular sawing 2024-09-10
machines for cross-cutting with
Voting terminates on:
2024-12-03
integrated feed
ICS: 13.110; 79.120.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
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Reference number
ISO/DIS 19085-21:2024(en)
DRAFT
ISO/DIS 19085-21:2024(en)
International
Standard
ISO/DIS 19085-21
ISO/TC 39/SC 4
Woodworking machines — Safety —
Secretariat: UNI
Part 21:
Voting begins on:
Double blade circular sawing
machines for cross-cutting with
Voting terminates on:
integrated feed
ICS: 13.110; 79.120.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2024
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
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Published in Switzerland Reference number
ISO/DIS 19085-21:2024(en)
ii
ISO/DIS 19085-21:2024(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Safety requirements and measures for controls . 6
4.1 Safety and reliability of control systems.6
4.2 Control devices .6
4.3 Start .6
4.3.1 Direct start .6
4.3.2 Start via control power-on .6
4.3.3 Cutting stroke .6
4.4 Safe stops .7
4.4.1 General .7
4.4.2 Normal stop .7
4.4.3 Operational stop .7
4.4.4 Emergency stop .7
4.5 Braking function of tools .7
4.6 Mode selection .7
4.7 Tool speed changing .8
4.7.1 Speed changing by shifting the belts on the pulleys .8
4.7.2 Speed changing by incremental speed change motor .8
4.7.3 Infinitely variable speed by frequency inverter .8
4.8 Failure of any power supply .8
4.9 Manual reset control .8
4.10 Standstill detection and monitoring .8
4.11 Machine moving parts speed monitoring.8
4.12 Time delay.8
4.13 Teleservice .8
4.14 Power-operated adjustments .8
5 Safety requirements and measures for protection against mechanical hazards . 9
5.1 Stability .9
5.2 Risk of break-up during operation .9
5.3 Tool and tool fixing design .10
5.3.1 General .10
5.3.2 Spindle locking .10
5.3.3 Circular saw blade fixing device .10
5.3.4 Flange dimension for circular saw blades .10
5.4 Braking .10
5.4.1 Braking of tools .10
5.4.2 Maximum run-down time .10
5.4.3 Brake release .10
5.5 Safeguards .10
5.5.1 Fixed guards .10
5.5.2 Interlocking moveable guards .10
5.5.3 Hold-to-run control .11
5.5.4 Two-hand control .11
5.5.5 Electro-sensitive protective equipment (ESPE) .11
5.5.6 Pressure sensitive protective equipment (PSPE) .11
5.5.7 Enabling control .11
5.6 Prevention of access to hazardous moving parts .11
5.6.1 Safeguarding of the saw blades in the rest position on downwards-cutting
machines . 12

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ISO/DIS 19085-21:2024(en)
5.6.2 Safeguarding of the saw blades in the rest position on horizontal and upward
cutting machines .14
5.6.3 Safeguarding of the saw blade during the cutting stroke on semi-automatic
machines .14
5.6.4 Safeguarding of automatic machines . 15
5.7 Impact hazard . 15
5.8 Clamping devices . 15
5.9 Measures against ejection . 15
5.9.1 General . 15
5.9.2 Guards materials and characteristics .16
5.10 Workpiece supports and guides . .16
5.10.1 Workpiece supports .16
5.10.2 Workpiece guides .17
6 Safety requirements and measures for protection against other hazards . 17
6.1 Fire .17
6.2 Noise .17
6.2.1 Noise reduction at the design stage .17
6.2.2 Noise emission measurement and declaration .17
6.3 Emission of chips and dust .17
6.4 Electricity .17
6.5 Ergonomics and handling .17
6.6 Lighting .18
6.7 Pneumatics .18
6.8 Hydraulics .18
6.9 Electromagnetic compatibility.18
6.10 Laser .18
6.11 Static electricity.18
6.12 Errors of fitting .18
6.13 Isolation .18
6.14 Maintenance .18
6.15 Relevant but not significant hazards .18
7 Information for use .18
7.1 Warning devices .18
7.2 Marking .19
7.2.1 General .19
7.2.2 Additional markings .19
7.3 Instruction handbook.19
7.3.1 General .19
7.3.2 Additional information .19
Annex A (informative) List of significant hazards .21
Annex B (informative) Performance levels required .23
Annex C (informative) Stability test .25
Annex D (normative) Test for braking function .26
Annex E (normative) Impact test for guards . .27
Annex F (normative) Noise test code . .28
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2006/42/EC aimed to be covered .31
Bibliography .33

iv
ISO/DIS 19085-21:2024(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 39, Machine tools, Subcommittee SC 4
Woodworking machines, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 142, Woodworking machines, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This document replaces EN 1870-9:2012, which has been technically revised.
A list of all parts in the ISO 19085 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

v
ISO/DIS 19085-21:2024(en)
Introduction
The ISO 19085 series of provides technical safety requirements for the design and construction of
woodworking machinery, as well as for the content of the relevant instruction handbook. It concerns
designers, manufacturers, suppliers and importers of the machines specified in the Scope.
This document is a type-C standard as defined in ISO 12100:2010.
This document is of relevance, in particular, for the following stakeholder groups representing the market
players with regard to machinery safety:
— machine manufacturers (small, medium and large enterprises);
— health and safety bodies (e.g. regulators, accident prevention organisations, market surveillance).
Others can be affected by the level of machinery safety achieved with the means of the document by the
above-mentioned stakeholder groups:
— machine users/employers (small, medium and large enterprises);
— machine users/employees (e.g. trade unions, organizations for people with special needs);
— service providers, for example, for maintenance (small, medium and large enterprises);
— consumers (in case of machinery intended for use by consumers).
The above-mentioned stakeholder groups have been given the possibility to participate in the drafting
process of this document.
The machinery concerned and the extent to which hazards, hazardous situations or hazardous events are
covered are indicated in the Scope of this document.
When requirements of this type-C standard are different from those which are stated in type-A or type-B
standards (as defined in ISO 12100:2010), the requirements of this type-C standard take precedence over
the requirements of the other standards for machines that have been designed and built according to the
requirements of this type-C standard.
The full set of requirements for a particular type of woodworking machine are those given in the part of the
ISO 19085 series applicable to that type, together with the relevant requirements from ISO 19085-1:2021, to
the extent specified in the Scope of the applicable part of the ISO 19085 series.
As far as possible, the safety requirements of parts of the ISO 19085 series refer to the relevant clauses
of ISO 19085-1:2021. Each part includes replacements and additions to the common requirements given in
ISO 19085-1:2021.
All parts of the ISO 19085 series have the same structure, so that reference to ISO 19085-1:2021 is made
always and only from and to the same subclause number, last indent.
Clauses 1 to 3 are specific to each part and, therefore are distinct from ISO 19085-1:2021, Clauses 1 to 3.
For Clauses 4 to 7 and the annexes, each subclause in ISO 19085-1:2021, is cited as:
— confirmed as a whole;
— confirmed with additions;
— excluded in total; or
— replaced with specific text.
This is indicated by one of the following possible statements:
— “ISO 19085-1:2021, [subclause/Annex], applies.”;

vi
ISO/DIS 19085-21:2024(en)
— “ISO 19085-1:2021, [subclause/Annex], applies with the following additions.” or “ISO 19085-1:2021,
[subclause/Annex], applies with the following additions, subdivided into further specific subclauses.”;
— “ISO 19085-1:2021, [subclause/Annex], does not apply.”;
— “ISO 19085-1:2021, [subclause/Annex], is replaced by the following text.” or “ISO 19085-1:2021,
[subclause/Annex], is replaced by the following text, subdivided into further specific subclauses.”.
Other subclauses and annexes specific to this document are indicated by the introductory sentence:
“Subclause/Annex specific to this document.”.

vii
DRAFT International Standard ISO/DIS 19085-21:2024(en)
Woodworking machines — Safety —
Part 21:
Double blade circular sawing machines for cross-cutting with
integrated feed
1 Scope
This document specifies the safety requirements and measures for double blade circular sawing machines
for cross-cutting with integrated feed of the cutting-stroke, with manual loading and/or unloading of the
workpiece and capable of continuous production use, hereinafter referred to also as “machines”.
The machines are designed to cut solid wood and material with similar physical characteristics to wood as
well as:
— aluminium profiles also filled or composed with plastic or foam or rubber based insulating materials;
— composite materials, with core consisting of e.g. polyurethane or mineral material, laminated with
light alloy;
— polymer-matrix composite materials and reinforced with thermoplastic or thermoset or elastomeric
materials;
— fibreglass;
— composite bars made from the materials listed above.
This document deals with all significant hazards, hazardous situations and events as listed in Annex A
relevant to the machines when operated, adjusted and maintained as intended and under the conditions
foreseen by the manufacturer; reasonably foreseeable misuse has been considered too. Transport, assembly,
dismantling, disabling and scrapping phases have also been taken into account.
This document does not apply to:
a) machines for cross-cutting logs;
b) machines intended for use in potentially explosive atmosphere;
c) machines manufactured prior to the publication of this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13855:2010, Safety of machinery — Positioning of safeguards with respect to the approach speeds of parts
of the human body
ISO 13857:2019, Safety of machinery — Safety distances to prevent hazard zones being reached by upper and
lower limbs
ISO/DIS 19085-21:2024(en)
ISO 19085-1:2021, Woodworking machines — Safety — Part 1: Common requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12100:2010, ISO 19085-1:2021 and
the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
double blade circular sawing machine for cross-cutting with integrated feed
machine fitted with two sawing heads, each with one sawing unit for cross-cutting with power-operated
cutting stroke (3.3), where the workpiece is stationary during cutting
Note 1 to entry: One or both sawing heads (see Figure 1, key 1 and 2) can be manually or power-operated moveable for
horizontal positioning.
Note 2 to entry: The saw units (see Figure 1, key 3) can be manually or power-operated tilted or pivoted or both.
Note 3 to entry: The workpiece can be manually or automatically positioned for cutting to pre-selected lengths.
3.2
workpiece positioning mechanism
mechanism using the clamping system and the power-operated horizontal positioning capability of a
movable saw unit to feed the workpiece to the intended position for cross cutting to the desired length
Note 1 to entry: The workpiece positioning mechanism can be used, for example, to allow processing workpieces
longer or shorter respectively than the maximum or minimum distance between the saw units.
Note 2 to entry: When the workpiece positioning mechanism is used, usually only one saw blade is operating during
the cutting stroke.
3.3
cutting stroke
feed movement of the saw unit incorporating the tool to perform the cut immediately followed by the return
of the saw unit to its rest position (3.7)
Note 1 to entry: The cutting stroke can be downward, horizontal or upward. See Figure 1 a) for a manual machine
with downward cutting stroke, where only the saw unit feed for the cutting stroke is power-operated, Figure 1 b) for a
fully power-operated machine with horizontal cutting stroke, and Figure 1 c) for a fully power-operated machine with
upward cutting stroke.
3.4
cutting cycle
automatic sequence of movements of one or both sawing heads for positioning to pre-
selected lengths, of the saw units for positioning to pre-selected angles and inclinations, and cutting stroke (3.3)
Note 1 to entry: More cutting cycles can be repeated automatically if pre-selected.
Note 2 to entry: see Figure 1 d) for an example of an automatic machine.

ISO/DIS 19085-21:2024(en)
a) machine with downward cutting stroke and manually moveable saw head

ISO/DIS 19085-21:2024(en)
b) machine with horizontal cutting stroke and power-operated moveable saw head
c) machine with upward cutting stroke and power-operated moveable saw head

ISO/DIS 19085-21:2024(en)
d) automatic machine
Key
1 fix saw head 4 control panel with two-hand control device
2 moveable saw head 5 workpiece support
3 saw unit
Figure 1 — Double blade circular sawing machines for cross-cutting with integrated feed for the
cutting stroke (examples with one fix and one moveable saw head)
3.5
semi-automatic double blade circular sawing machine
double blade circular sawing machine for cross-cutting with integrated feed (3.1) where the workpiece is
positioned by means of a manually controlled power operated positioning mechanism and the cutting stroke
(3.3) is initiated manually for each cross-cutting to length
3.6
automatic double blade circular sawing machine
double blade circular sawing machine for cross-cutting with integrated feed (3.1) with workpiece positioning
mechanism and material buffer for batch processing
Note 1 to entry: Batch processing includes a cutting cycle (3.4) or a pre-selected sequence of cutting cycles.
EXAMPLE See Figure 1 d).
3.7
rest position
position where the saw blade is fully inside the guarding and from which the saw unit starts the
cutting stroke (3.3) and to which it returns at the end of each cutting stroke (3.3)
3.8
initiation control
control which after actuation enables providing power to specific machine actuators, e.g. by a programmable
logic control
ISO/DIS 19085-21:2024(en)
4 Safety requirements and measures for controls
4.1 Safety and reliability of control systems
ISO 19085-1:2021, 4.1, applies with the following additions.
Annex B provides an informative summary table of Performance Levels required (PL ) specified in Clauses 4
r
and 5 for each safety function.
4.2 Control devices
ISO 19085-1:2021, 4.2, applies with the following additions.
Where the machine is fitted with a two-hand control device, this shall be:
a) at the front of the machine;
b) below the workpiece support;
c) at a minimum height above floor level of 750 mm;
d) movable and capable of being adjusted centrally between the saw units.
If the control device for clamping is separate from the two-hand control device, it shall be within 400 mm
measured horizontally from the two-hand control device.
The machine shall be equipped with one or more emergency stop devices (see 4.4.4) at the following
positions:
1) within 1,0 m of the workpiece loading position;
2) within 1,0 m of the workpiece unloading position;
3) at the main control panel;
4) within 500 mm of a two-hand control device;
5) within 3,0 m of the saw unit.
NOTE Taking into account the two-hand control positioned in the centre.
If the distance between two or more of the positions above is less than 1 m, only one emergency stop control
device is required instead of two or more.
4.3 Start
4.3.1 Direct start
ISO 19085-1:2021, 4.3.1, applies.
4.3.2 Start via control power-on
ISO 19085-1:2021, 4.3.2, applies.
4.3.3 Cutting stroke
Subclause specific to this document.
In semi-automatic machines each cutting stroke shall be started with a hand-operated control device.
The cutting stroke shall only be capable of being started when the saw blade rotation and powered workpiece
clamping, if fitted, have been initiated.

ISO/DIS 19085-21:2024(en)
The SRP/CS for the interlocking of the cutting stroke with the saw blade rotation shall achieve PL = c.
r
The SRP/CS for the interlocking of the cutting stroke with the powered workpiece clamping shall achieve
PL = c.
r
4.4 Safe stops
4.4.1 General
ISO 19085-1:2021, 4.4.1, applies with the following additions.
The stopping sequence shall be as follows:
a) initiate the return stroke of the saw blade;
b) stop the tool drive in stop category 0 or 1.
At the end of stopping sequence, powered workpiece clamping devices may be de-energized if no additional
hazard occurs.
4.4.2 Normal stop
ISO 19085-1:2021, 4.4.2, applies.
4.4.3 Operational stop
ISO 19085-1:2021, 4.4.3, does not apply.
4.4.4 Emergency stop
ISO 19085-1:2021, 4.4.4, applies.
4.5 Braking function of tools
ISO 19085-1:2021, 4.5, applies.
4.6 Mode selection
ISO 19085-1:2021, 4.6, is replaced by the following text.
A mode selector shall be provided for automatic machines as well as for machines designed to operate
as semi-automatic too. All requirements for each type of machine shall apply when operating in the
corresponding mode.
IEC 60204-1:2016, 9.2.3.5, applies.
Mode selection shall be in accordance with the following requirements (see also ISO 12100:2010, 6.2.11.10):
a) the mode selected shall override all other controls or operating modes, except emergency stop;
b) the mode selector shall be lockable in any position, e.g. by a key-operated switch;
c) changing the mode shall not initiate any movement of the machine;
d) when changing modes, the machine shall be brought to a safe stop.
The SRP/CS for mode selection shall achieve PLr = c.

ISO/DIS 19085-21:2024(en)
4.7 Tool speed changing
4.7.1 Speed changing by shifting the belts on the pulleys
ISO 19085-1:2021, 4.7.1, does not apply.
4.7.2 Speed changing by incremental speed change motor
ISO 19085-1:2021, 4.7.2, applies.
4.7.3 Infinitely variable speed by frequency inverter
ISO 19085-1:2021, 4.7.3, applies with the following additions.
Requirements on speed monitoring stated in ISO 19085 1:2021 apply to the maximum rotational speed set
by the manufacturer for the saw blade.
4.8 Failure of any power supply
ISO 19085-1:2021, 4.8, applies.
4.9 Manual reset control
ISO 19085-1:2021, 4.9, applies.
4.10 Standstill detection and monitoring
ISO 19085-1:2021, 4.10, does not apply.
4.11 Machine moving parts speed monitoring
ISO 19085-1:2021, 4.11, applies.
4.12 Time delay
ISO 19085-1:2021, 4.12, applies.
4.13 Teleservice
ISO 19085-1:2021, 4.13, applies.
4.14 Power-operated adjustments
Subclause specific to this document.
On automatic machines, access to shearing and crushing hazards due to power-operated adjustments like
horizontal positioning of moveable saw heads and like tilting and pivoting of saw units and workpiece
positioning during cutting cycle shall be prevented fulfilling the requirements stated in 5.6.4.
On semiautomatic machines and on automatic machines operating as semiautomatic machines, power-
operated adjustments like horizontal positioning of moveable saw heads and like tilting and pivoting of saw
units shall only be possible after actuation of a hold-to-run control device. As an alternative, an initiation
control device for movements under pre-set electronic control may be used to start these movements in
combination with a limiting device (see ISO 12100:2010, 3.26.8) preventing the saw heads from coming
closer than 300 mm from each other or from their end stop on the machine frame if not prevented by design.
In this case, the machine heads shall stop when reaching 300 mm, and shall only be permitted to come
closer than 300 mm by using a hold-to-run control. The cutting stroke and initiation control in sequence

ISO/DIS 19085-21:2024(en)
may be initiated by using the two-hand control required for initiating the cutting stroke. Other crushing and
shearing points along the movement of the saw heads shall be avoided by design.
The SRP/CS for initiation control shall achieve PL = c.
r
The SRP/CS for interlocking by limiting device shall achieve PLr = c.
Unexpected start of power-operated adjustments under pre-set electronic control shall be prevented after
the pre-set position has been reached. This can be achieved, for example, by a time delay device, which, after
actuation of the initiation control for power-operated adjustments, cuts power to the actuators with a time
delay set to the maximum possible adjustment time.
NOTE 1 Machine axes calibration is included in power-operated adjustments of saw hea
...