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oSIST prEN 12750:2008
01-julij-2008
Varnost lesnoobdelovalnih strojev - Rezkalnik za štiristransko obdelavo
Safety of woodworking machines - Four sided moulding machines
Sicherheit von Holzbearbeitungsmaschinen - Fräsmaschinen für vierseitige Bearbeitung
Sécurité des machines pour le travail du bois - Machines à moulurer sur quatre faces
Ta slovenski standard je istoveten z: prEN 12750
ICS:
79.120.10 Lesnoobdelovalni stroji Woodworking machines
oSIST prEN 12750:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD
DRAFT
prEN 12750
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2008
ICS 79.120.10 Will supersede EN 12750:2001
English Version
Safety of woodworking machines - Four sided moulding
machines
Sécurité des machines pour le travail du bois - Machines à Sicherheit von Holzbearbeitungsmaschinen -
moulurer sur quatre faces Fräsmaschinen für vierseitige Bearbeitung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 142.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12750:2008: E
worldwide for CEN national Members.
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prEN 12750:2008 (E)
Contents Page
Foreword.4
Introduction .4
1 Scope.5
2 Normative references.5
3 Terms and definitions .8
3.1 General.8
3.2 Definitions.8
4 List of significant hazards .13
5 Safety requirements and/or measures .16
5.1 General.16
5.2 Controls.16
5.2.1 Safety and reliability of control systems.16
5.2.2 Position of controls .19
5.2.3 Starting.20
5.2.4 Normal stopping.20
5.2.5 Emergency stop.21
5.2.6 Mode selection.22
5.2.7 Speed changing.23
5.2.8 Direction of rotation.25
5.2.9 Integrated feed.25
5.2.10 Power operated spindle adjustment during setting.26
5.2.11 Control duplication.26
5.2.12 Failure of the power supply.27
5.2.13 Failure of control circuits.27
5.3 Protection against mechanical hazards .27
5.3.1 Stability.27
5.3.2 Risk of break-up during operation.27
5.3.3 Tool holder and tool design.28
5.3.4 Braking.30
5.3.5 Devices to minimise the possibility or the effect of ejection .32
5.3.6 Work-piece supports and guides.37
5.3.7 Prevention of access to moving parts and ejection of parts of tools .39
5.3.8 Required characteristics of tool guards.44
5.3.9 Retaining devices.44
5.4 Protection against non-mechanical hazards .45
5.4.1 Fire.45
5.4.2 Noise.45
5.4.3 Emission of chips and dust.46
5.4.4 Electricity.47
5.4.5 Ergonomics and handling.47
5.4.6 Lighting.48
5.4.7 Pneumatics.48
5.4.8 Hydraulics.48
5.4.9 Electromagnetic immunity.48
5.4.10 Static electricity.48
5.4.11 Supply disconnection (isolation) .48
5.4.12 Errors of fitting.49
5.4.13 Maintenance.49
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prEN 12750:2008 (E)
6 Information for use.49
6.1 Warning devices.49
6.2 Marking.50
6.3 Instruction handbook.51
Annex A (informative) Use of well-tried components and safety principles .55
Annex B (normative) Use of electronic components .56
B.1 General.56
B.2 Safety-related parts of a control system (SRP/CS).56
B.2.1 Design.56
B.2.2 Safety-related software.56
B.2.3 Validation.57
Annex C (normative) Spindles specification.59
Annex D (normative) Braking tests.60
D.1 Conditions for all tests.60
D.2 Unbraked run-down time .60
D.3 Braked run-down time.60
D.4 Run-up time.61
Annex E (normative) Table lip resistance test.62
E.1 General.62
E.2 Test probe.62
E.3 Measurements.64
E.4 Tests.64
E.5 Result.65
E.6 Test report.65
Annex F (normative) Impact test method for guards .66
F.1 General.66
F.2 Test method.66
F.2.1 Preliminary remarks.66
F.2.2 Testing equipment.66
F.2.3 Projectile for guards.66
F.2.4 Sampling.67
F.2.5 Test procedure.67
F.3 Results.67
F.4 Assessment.68
F.5 Test report.68
F.6 Test equipment for impact test .68
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 98/37/EC.70
Annex ZB (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC.73
Bibliography.77
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prEN 12750:2008 (E)
Foreword
This document (prEN 12750:2008) has been prepared by Technical Committee CEN/TC 142 “Woodworking
machines - Safety”, the secretariat of which is held by UNI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12750:2001.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of the Machinery Directives.
For relationship with EC Directives, see informative Annex ZA and Annex ZB, which are integral part of this
document.
Organisations contributing to the preparation of this European Standard include the European Manufacturers
Association "EUMABOIS".
The European Standards produced by CEN/TC 142 are particular to woodworking machines and complement
the relevant A and B Standards on the subject of general safety (see introduction of EN ISO 12100-1:2003 for
a description of A, B and C standards).
Introduction
This document has been prepared to be a harmonised standard to provide one means of conforming to the
Essential Health and Safety Requirements of the Machinery Directive and associated EFTA Regulations.
This document is intended to replace EN 12750:2001. EN 12750:2001 can be further applied until 29/12/2009.
This document is a type C standard as defined in EN ISO 12100-1:2003.
The machinery concerned and the extent to which hazards, hazardous situations and events are covered is
indicated in the scope of this document.
When provisions of this type C standard are different from those which are stated in type A or B standards, the
provisions of this type C standard take precedence over the provisions of other standards, for machines that
have been designed and built according to the provisions of this type C standard.
The requirements of this document are directed to manufacturers and their authorised representatives of four
sided moulding machines. This document is also useful for designers.
This document also includes provisions and examples of information to be provided by the manufacturer to
the user.
Common requirements for tooling are given in EN 847-1:2005 + A1:2007.
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prEN 12750:2008 (E)
1 Scope
This document deals with the significant hazards, hazardous situations and events as listed in clause 4, which
are relevant to stationary four sided moulding machines with a maximum working width of 350 mm and a
maximum speed of the integrated work-piece feed of 200 m/min, with electrical and/or electronic control
system, hereafter referred to as "machines" designed to cut solid wood, chipboard, fibreboard, plywood and
also these materials where these are covered with plastic laminate or edgings when they are used as
intended and under the conditions foreseen by the manufacturer, including reasonably forseeable misuse of
the machine (see 6.3 c)).
NOTE 1 For the definition of a stationary machine see 3.2.1.
This document deals also with hazards relating to the following optional work units:
universal spindle;
glass bead cutting unit.
This document is not applicable to machines designed for machining logs which have not previously been
machined.
This document does not deal with any hazards relating to:
1) infeed devices (magazines, hoppers, etc.);
NOTE 2 For mechanical infeed devices which also prevent access to the infeed opening see 5.3.7.2.
2) single machines being used in combination with any other machine (as part of a line);
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3) hot surfaces related to feed speeds exceeding 120 m min ;
4) outfeed devices (e.g. mechanical handling systems) except for hazards related to ejection from the
machine due to climb cutting.
This document is not applicable to four sided moulding machines which are manufactured before the date of
its publication as EN.
2 Normative references
The following referenced documents are indispensable for the application 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.
EN 294:1992, Safety of machinery – Safety distances to prevent danger zones being reached by the upper
limbs
EN 847-1:2005 + A1:2007, Tools for woodworking –Safety requirements – Part 1: Milling tools, circular saw
blades
EN 894-1:1997, Safety of machinery – Ergonomics requirements for the design of displays and control
actuators – Part 1: General principles for human interactions with displays and control actuators
EN 894-2:1997, Safety of machinery – Ergonomics requirements for the design of displays and control
actuators – Part 2: Displays
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prEN 12750:2008 (E)
EN 894-3:2000, Safety of machinery — Ergonomics requirements for the design of displays and control
actuators — Part 3: Control actuators
EN 953:1997, Safety of machinery – Guards - General requirements for the design and construction of fixed
and movable guards
EN 982:1996, Safety of machinery — Safety requirements for fluid power systems and their components —
Hydraulics
EN 983:1996, Safety of machinery — Safety requirements for fluid power systems and their components —
Pneumatics
EN 1005-1:2001, Safety of machinery — Human physical performance — Part 1: Terms and definitions
EN 1005-2:2003, Safety of machinery — Human physical performance — Part 2: Manual handling of
machinery and component parts of machinery
EN 1005-3:2002, Safety of machinery — Human physical performance — Part 3: Recommended force limits
for machinery operation
EN 1005-4:2005, Safety of machinery — Human physical performance — Part 4: Evaluation of working
postures and movements in relation to machinery
EN 1037:1995, Safety of machinery — Prevention of unexpected start-up
EN 1088:1995 + A1:2007, Safety of machinery — Interlocking devices associated with guards — Principles
for design and selection
EN 1760-2:2001, Safety of machinery - Pressure sensitive protective devices - Part 2: General principles for
the design and testing of pressure sensitive edges and pressure sensitive bars
EN 50178:1997, Electronic equipment for use in power installations
EN 50370-1:2005, Electromagnetic compatibility (EMC) — Product family standard for machine-tools —
Part 1: Emission
EN 50370-2:2003, Electromagnetic compatibility (EMC) — Product family standard for machine-tools —
Part 2: Immunity
EN 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
(IEC 60204-1:2005, modified)
EN 60439-1:1999 + A1:2004, Low-voltage switchgear and controlgear assemblies — Part 1: Type-tested and
partially type-tested assemblies (IEC 60439-1:1999)
EN 60529:1991 + A1:2000, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989)
EN 61310-1:1995, Safety of machinery — Indication, marking and actuation — Part 1: Requirements for visual,
auditory and tactile signals (IEC 61310-1:1995)
EN 61496-1:2004, Safety of machinery — Electro-sensitive protective equipment — Part 1: General
requirements and tests (IEC 61496-1:2004, modified)
EN 61508-2:2001, Functional safety of electrical/electronic/programmable electronic safety-related systems —
Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems (IEC 61508-
2:2000)
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prEN 12750:2008 (E)
EN 61508-3:2001, Functional safety of electrical/electronic/programmable electronic safety-related systems —
Part 3: Software requirements (IEC 61508-3:1998 + Corrigendum 1999)
EN 61508-7:2001, Functional safety of electrical/electronic/programmable electronic safety-related systems –
Part 7 Overview of techniques and measures (IEC 61508-7:2000)
EN 62061:2005, Safety of machinery – Functional safety of safety-related electrical, electronic and
programmable electronic control systems (IEC 62061:2005)
EN ISO 20354:2003, Acoustics - Measurement of sound absorption in a reverberation room (ISO 354:2003)
EN ISO 3743-1:1995, Acoustics — Determination of sound power levels of noise sources — Engineering
methods for small, moveable sources in reverberant fields — Part 1: Comparison method for hard-walled test
rooms (ISO 3743-1:1994)
EN ISO 3743-2:1996, Acoustics — Determination of sound power levels of noise sources using sound
pressure — Engineering methods for small, moveable sources in reverberant fields — Part 2: Methods for
special reverberation test rooms (ISO 3743-2:1994)
EN ISO 3744:1995, Acoustics — Determination of sound power levels of noise sources using sound pressure
— Engineering method in an essentially free field over a reflecting plane (ISO 3744:1994)
EN ISO 3745:2003 + AC:2006, Acoustics — Determination of sound power levels of noise sources using
sound pressure — Precision methods for anechoic and semi-anechoic rooms (ISO 3745:2003)
EN ISO 3746:1995, Acoustics — Determination of sound power levels of noise sources using sound pressure
— Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:1995)
EN ISO 4871:1996, Acoustics — Declaration and verification of noise emission values of machinery and
equipment (ISO 4871:1996)
EN ISO 9614-1:1995, Acoustics — Determination of sound power levels of noise sources using sound
intensity — Part 1: Measurement at discrete points (ISO 9614-1:1993)
EN ISO 11202:1995 + AC:1997, Acoustics — Noise emitted by machinery and equipment — Measurement of
emission sound pressure levels at a workstation and at other specified positions — Survey method in situ
(ISO 11202:1995)
EN ISO 11204:1995 + AC:1997, Acoustics — Noise emitted by machinery and equipment — Measurement of
emission sound pressure levels at a workstation and at other specified positions — Method requiring
environmental corrections (ISO 11204:1995)
EN ISO 11688-1:1998+AC:1998, Acoustics – Recommended practice for the design of low-noise machinery
and equipment – Part 1: Planning (ISO/TR 11688-1:1995)
EN ISO 12100-1:2003, Safety of machinery - Basic concepts, general principles for design - Part 1: Basic
terminology, methodology (ISO 12100-1:2003)
EN ISO 12100-2:2003, Safety of machinery - Basic concepts, general principles for design - Part 2: Technical
principles (ISO 12100-2:2003)
EN ISO 13849-1:2006, Safety of machinery — Safety-related parts of controls systems — Part 1: General
principles for design (ISO 13849-1:2006)
EN ISO 13849-2:2003, Safety of machinery — Safety-related parts of controls systems — Part 2: Validation
(ISO 13849-2:2003)
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prEN 12750:2008 (E)
ISO 7960:1995, Airborne noise emitted by machine tools – Operating conditions for woodworking machines
3 Terms and definitions
3.1 General
For the purposes of this document the terms and definitions given in EN ISO 12100-1:2003 and the following
apply.
3.2 Definitions
3.2.1
four sided moulding machine
machine where the work-piece once loaded manually or by magazine, moves by an integrated feed
mechanism (machines where the first feed roller is fitted after the first tool are, for the purpose of this
document, integrated fed machines). The machine has at least four work units, one on each side, with rotating
planing or moulding tools. The spindles have horizontal and/or vertical axes which can be adjusted manually
or under power.
The machine can be fitted with additional work units such as universal spindle(s) or glass bead cutting unit(s)
3.2.2
universal spindle
work unit, the position of which can be changed manually or under power so as to allow it to work at different
positions around the work-piece
3.2.3
glass bead cutting unit
work unit fitted with a tool, usually a saw blade, to cut out a glass bead from the machined profile of the work-
piece (e.g. see figure 1)
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prEN 12750:2008 (E)
Key
1 glass bead saw-blade
2 bed ledge separator
3 anti-kickback finger
4 pressure device
5 guiding channel for glass bead ledge
6 glass bead ledge
7 work-piece
8 fixed safeguard for glass bead saw blade
9 automatic guard for glass bead saw blade
10 fence
11 feed direction
Figure 1 — Example of a glass bead cutting unit
3.2.4
hydraulic tool fixing device
device for clamping the tool to the spindle using hydraulic pressure
3.2.5
integrated feed on four sided moulding machines
feed mechanism for the work-piece or tool which is integrated with the machine and where the work-piece or
machine element with incorporated tool are held and controlled mechanically during the machining operation
3.2.6
loading of four sided moulding machines
manual or automatic placing of the work-piece on to a carriage, magazine, lift, hopper, movable bed, conveyor
or the presentation of the work-piece to an integrated feed device
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prEN 12750:2008 (E)
3.2.7
climb cutting
when the relative rotational direction of the tool cutting point is in the same direction as the feed
3.2.8
cutting area of the tool
area of the tool involved in the cutting process
3.2.9
non-cutting area of the tool
area of the tool which is not involved in the cutting process
3.2.10
ejection
uncontrolled movement of the work-piece or parts of it or part of the tool from the machine during processing
3.2.11
kickback
unexpected sudden move
...