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STANDARD
SIST EN 12387:2005+A1:2009
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12387:2005+A1
August 2009 ICS 61.060 Supersedes EN 12387:2005English Version
Footwear, leather and imitation leather goods manufacturing machines - Modular shoe repair equipment - Safety requirements
Machines pour la fabrication de chaussures et d'articles chaussants en cuir et matériaux similaires - Equipement modulaire de réparation de chaussures - Prescriptions de sécurité
Maschinen zur Herstellung von Schuhen, Leder- und Kunstlederwaren - Schuhreperaturmaschinen - Sicherheitsanforderungen This European Standard was approved by CEN on 10 January 2005 and includes Amendment 1 approved by CEN on 16 July 2009.
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. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12387:2005+A1:2009: ESIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 2 Contents Foreword . 3 1 Scope . 5 2 Normative references . 6 3 Terms and definitions . 7 4 !!!!List of significant hazards"""" . 9 5 Safety requirements and/or measures . 17 6 Verification of safety requirements and/or measures . 22 7 Information for use . 26 Annex A (normative)
Requirements for covers and guards . 29 Annex B (normative)
Requirements for hold-to-run control device for combined heel and sole presses . 30 Annex C (normative)
Noise test code for modular shoe repair equipment . 31 Annex D (normative)
Requirements for dust extraction system . 34 Annex E (normative)
Minimum distances and working height for finishing machines . 35 Annex F (normative) . 36 Annex G (informative)
Lighting for finishing machines . 38 Bibliography . 41 SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 3 Foreword This document (EN 12387:2005+A1:2009) has been prepared by Technical Committee CEN/TC 201 “Leather and imitation leather goods and footwear manufacturing machinery - Safety”, the secretariat of which is held by UNI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2010, and conflicting national standards shall be withdrawn at the latest by February 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document includes Amendment 1, approved by CEN on 2009-07-16. This document supersedes EN 12387:2005. The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ". 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 EU Directive(s). !For relationship with EU Directive(s), see informative Annexes ZA and ZB, which are integral parts of this document." According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: 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.
SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 4 Introduction This document is a Type C standard as stated in !EN ISO 12100-1". The machinery concerned and the extent to which hazards, hazardous situations and events are covered are 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 the other standards, for machines that have been designed and built according to the provisions of this Type C standard. SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 5 1 Scope 1.1 This document applies to the following machines including their additional equipment intended for the repair of footwear, leather and imitation leather goods as well as for the manufacture and repair of orthopaedic shoes hereafter called "Shoe Repair Machines": a) Polishing machines; b) Trimming machines; c) Scouring machines; d) Finishing machines; e) Orthopaedic finishing machines; f) Heel and sole press; g) Activating unit – Adhesive; h) Orthopaedic vacuum moulding press; i) Orthopaedic presses; j) Extraction equipment; k) Powered ranging device; l) Edge inking or staining machines; m) Mechanism for stationary nailing and stapling tools. These machines can be standing alone or combined in a modular system for shoe repairs or the production of orthopaedic shoes including the lasts. 1.2 This document does not apply to: a) Sewing machines b) Autosoling machines c) Sole stitching machines d) Hand operated pneumatic nail drivers or staple tackers. 1.3 This document specifies safety requirements for construction, transport, installation, setting, adjustment, programming or converting, operating, cleaning, maintenance for the machines listed in 1.1.
1.4 This document deals with all significant hazards, hazard situations and events relevant to shoe repair machines when they are used as intended and under the conditions foreseen by the manufacturer (see Clause 4). The document does not deal with hazards due to use of the machines different from the use defined in 1.1. 1.5 This document assumes the machines are: operated by adequately trained persons SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 6 used with adequate workplace lighting (see EN 12464-1). 1.6 !This document is not applicable to shoe repair 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 distance to prevent danger zones being reached by the upper limbs EN 349:1993, Safety of machinery – Minimum gaps to avoid crushing of parts of the human body !deleted text" !EN 574", Safety of machinery – Two-hand control devices – Functional aspects – Principles for design EN 626-1:1994, Safety of machinery – Reduction of risks to health from hazardous substances emitted by machinery – Part 1: Principles and specifications for machinery manufacturers EN 842, Safety of machinery – Visual danger signals – General requirements, design and testing EN 953:1997, Safety of machinery – Guards – General requirements for the design and construction of fixed and movable guards !deleted text" EN 982, Safety of machinery – Safety requirements for fluid power systems and their components – Hydraulics EN 983, Safety of machinery – Safety requirements for fluid power systems and their components – Pneumatics !deleted text" EN 1088, Safety of machinery – Interlocking devices associated with guards – Principle for design and selection EN 1127-1, Explosive atmospheres – Explosion prevention and protection – Part 1: Basic concepts and methodology EN 1837, Safety of machinery - Integral lighting of machines EN 12545:2000, Footwear, leather and imitation leather goods manufacturing machines – Noise test code – Common requirements EN 13478, Safety of machinery – Fire prevention and protection !EN ISO 11688-1", Acoustics – Recommended practice for the design of low-noise machinery and equipment – Part 1: Planning (ISO/TR 11688-1:1995) EN ISO 11688-2, Acoustics - Recommended practice for the design of low-noise machinery and equipment - Part 2: Introduction to the physics of low-noise design (ISO/TR 11688-2:1998) SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 7 EN ISO 11689, Acoustics – Procedure for the comparison of noise emission data for machinery and equipment 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 13732-1, Ergonomics of the thermal environment – Methods for the assessment of human responses to contact with surfaces – Part 1: Hot surfaces (ISO 13732-1:2006)" !EN ISO 13849-1, Safety of machinery – Safety-related parts of control systems – Part 1: General principles for design (ISO 13849-1:2006)" !EN ISO 13850, Safety of machinery – Emergency stop - Principles for design (ISO 13850:2006)" !EN ISO 14122-1", Safety of machinery-Permanent means of access to machinery – Part 1: Choice of fixed means of access between two levels (ISO 14122-1:2001) !EN 60204-1:2006", Safety of machinery – Electrical equipment of machines – Part 1: General requirements !(IEC 60204-1:2005 (modified))" !EN 60335-2-69:2003, Household and similar electrical appliances – Safety – Part 2-69: Particular requirements for wet and dry vacuum cleaners, including power brush, for industrial and commercial use (IEC 60335-2-69:2002, modified)" !EN 61310-1", Safety of machinery – Indication, marking and actuation – Part 1: Requirements for visual, auditory and tactile signals !(IEC 61310-1:2007)" 3 Terms and definitions For the purposes of this document the terms and definitions given in EN ISO 12100-1:2003, EN ISO 12100-2:2003, and the following apply: 3.1 scouring section or machine section or machine which transmits energy from a prime mover to a tool for the purpose of removing layers of material 3.2 abrasive disc/cone disc or cone of metal, wood, cloth, felt, rubber or paper having any surface consisting wholly or partly of abrasive material 3.3 polishing section or machine section or machine which transmits energy from a prime mover to a tool for the purpose of removing or applying layers of material 3.4 trimming section or machine section or machine which transmits energy from a prime mover to a rotary tool for the purpose of trimming the edges of material SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 8 3.5 naumkeag section section which transmits energy from a prime mover to an abrasive tool for the purpose of removing fine layers of materials 3.6 tool includes rotary cutters, abrasive bands, discs, pads and wheels, abrasive steel tools, rotary brushes, pads and mops, edge irons, drills 3.7 abrasive wheel rotating wheel, cylinder, disc or cone which consists of natural or artificial abrasive particles held together by mineral, metallic or organic bond 3.8 finishing machine machine consisting of several sections including scouring as defined in 3.1, 3.3, 3.4 and 3.5 3.9 orthopaedic finishing machine machine generally as a finishing machine adapted at the trimming, scouring and naumkeag sections in order to work on the manufacture and repair of orthopaedic footwear and lasts 3.10 abrasive band band of cloth, felt, rubber, paper or similar material, the outside surface of which consists wholly or partly of abrasive material 3.11 presses combined heel and sole press/orthopaedic press: A machine which transmits energy from a prime mover to a pad or an inflatable bag containing a gas or a liquid for the purpose of applying pressure to a component 3.12 adhesive activating equipment device for activation by heat of applied adhesive 3.13 powered ranging device device which transmits energy from a prime mover to a cutting tool for the purpose of removing surplus material from the edges of soles and heels when attached to repaired shoes, and for cutting strips of material 3.14 heel attaching machine machine which transmits energy from a prime mover to a number of drivers which drive nails, pins or staples through the insole and sole seat into a heel unit 3.15 edge inking or staining machines machine which transmits ink and/or wax to an applicator for the purpose of staining the edges of materials 3.16 edge iron rotating disc, singular or in combination for the purpose of setting the edge of soles, heels and other components SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 9 3.17 working area area of the machine which covers: a) tool area in which the operating cycles take place; b) operator's position. 4 !!!!List of significant hazards"""" 4.1 This clause contains all the significant hazards, hazardous situations and events as far as they are dealt with in this document, identified by risk assessment as significant for this type of machinery and which require action to eliminate or reduce the risk (see 4.1 – 4.10 of Table 1).
NOTE Typical outlines of these machines together with significant danger areas are given in Figures 1 and 2 and Annex B.! The Figures are given for information only." 4.2 !!!!deleted text" Before using the standard it is important to carry out a risk assessment of shoe repair machines to check that its significant hazards are identified in this clause. SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 10 Table 1 — !!!!List of significant hazards"""" Danger zone or source of hazard Type of hazard Figure Rel. No. in Clause 5 of this document 4.1 Mechanical hazards
4.1.1 Transmission and drive mechanisms entanglement or drawing in, trapping, friction, impact, crushing and shearing
5.2.1.1 4.1.2 Moving machinery parts, tools, work pieces drawing in and trapping, friction, impact, crushing and shearing
5.3.1.1 5.2.1.2 5.2.1.3 5.2.1.4 4.1.3 Finishing machines
4.1.3.1 Scouring section
- all abrasive tools
-
abrasive wheel:Bursting
particle ejection from tool friction, abrasion, drawing-in or entanglement, trapping Flying parts
5.3.1.2 5.3.1.3
5.3.1.4 4.1.3.2 Naumkeag section particle ejection from tool friction, abrasion, drawing-in or entanglement, trapping
5.3.1.6 Naumkeag when fitted with drill stabbing or puncture
5.3.1.5 4.1.3.3 Trimming section
Rotating tools and guides cutting, severing, drawing-in, trapping, particle ejection
5.3.1.7 Manual or power positional changing of tools entanglement, crushing, shearing
5.3.1.8 5.3.1.9 4.1.3.4 Polishing section
Rotating tools entanglement
Power or manual positional of any changing of tools crushing and shearing
5.3.1.2 SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 11 Table 1 — !!!!List of significant hazards"""" (continued) Danger zone or source of hazard Type of hazard Figure Rel. No. in Clause 5 of this document 4.1.4 Heel and sole presses
Pressing area between pressing pad/lasting mould or work piece area between pressing pad and body of machine when returns crushing and shearing
5.3.2.1 5.3.2.2 5.3.2.3 4.1.5 Mechanism for stationary nailing and stapling tools
Accidental operation by advancing the work piece shoot in of nails and staplers 3 5.3.3 4.1.6 Powered ranging device cutting, severing, shearing 4 5.3.4 4.2 Operator's position
- protruding parts - uneven, sloping, slippery platforms - steps slips, trips and falls
5.2.1.5 4.3 Electrical hazard
5.2.2.1 Electrical contact, direct or indirectly, caused by - component failure - insulation failure - incorrect design, installation or component specification of the electrical equipment electric shock or burns
5.2.2.2 4.4 Thermal hazard
- accidental contact with hot surfaces risk of burns
5.2.3 4.5 Noise
- the action of the tool on the worked material or component - pneumatic systems - extraction equipment - motor and transmission equipment damage to hearing, physiological disorders, interference with speech-communication and acoustic signals
5.2.4 4.6 Emission of dust
The action of the tool on the materials being worked create leather, plastic or rubber dust risk of occupational disease (respiratory problems)
5.2.5
SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 12 Table 1 — !!!!List of significant hazards"""" (concluded)
4.7 Fire and explosion hazard at finishing machines
5.3.1.10 - through material being worked (scouring) it comes to - flammable dust - through accumulation fire hazard - through whirling up the accumulation of dust explosive atmospheres (seldom and for short periods in connection with ignition source → fire and/or explosions) fire dust explosions (deflagration)
5.3.1.11 5.3.1.12 5.3.1.13 5.3.1.14 5.3.1.15 5.3.1.16 4.8 Neglect of ergonomic principles risk of occupational disease
5.3.1.17
- inadequate local lighting - accidents resulting from poor visibility
- poor operator's posture - fatigue
- poor operating conditions - psychological stress
- too small space between the tools
- risk of friction and abrasion
- unsuitable working height - musculo-skeletal damage
4.9 Functional disorders of controls and energy supply
5.2.6
- failure of control system all possible hazards generated by unexpected dangerous movements 5.2.6.1 5.2.6.2
- fault of energy supply (irregularity, failure, unexpected reconnection)
5.2.6.3
- accident operation of foot actuated controls
5.2.6.4 4.10 Fluid systems, ejection of pressure medium injury from hot oil or impact from flexible hoses
5.2.6.1 SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 13
a) Frontal view Key 1 Power transmission (4.1.1) – Rotating shafts (4.1.2) 2 Scouring section (4.1.3.1) 3 Naumkeag (4.1.3.2) 4 Trimming section (4.1.3.3) 5 Polishing section (4.1.3.4)
SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 14
b) Lateral view Key 1 Power transmission (4.1.1) – Rotating shafts (4.1.2) 2 Operator's position (4.2)
Figure 1 — Example of a finishing machine SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 15
Key 1 Power transmission (4.1.1) 2 Pressing area (4.1.4)
Figure 2 — Example of a heel and sole press SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 16
Figure 3 — Mechanism for stationary nailing and stapling tools
Figure 4 — Powered ranging device SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 17 5 Safety requirements and/or measures 5.1 General Machinery shall comply with the safety requirements and/or measures of this clause. In addition, the machine shall be designed according to the principles of EN ISO 12100 for hazards relevant but not significant, which are not dealt with by this document (e.g. sharp edges).
For hazards which are to be reduced by the application of a B-level standard the manufacturer shall carry out a risk assessment to establish the requirements of the B-standard to be applied. This specific risk assessment is part of the general risk assessment of the machine. 5.2 Common requirements for all shoe repair machines 5.2.1 Mechanical equipment 5.2.1.1 All transmission machinery and drive mechanisms which give rise to danger shall be enclosed by fixed enclosing guards which satisfy EN 953. 5.2.1.2 !Unless required otherwise by 5.3 hazardous movements of machinery parts, tools and work pieces shall be safeguarded by:" fixed enclosing guards which satisfy EN 953; or in case of technical impossibility fixed covers which satisfy Annex A of this document. 5.2.1.3 Safety distances and gaps shall comply with EN 294:1992, Tables 1, 3 and 4, unless specified otherwise by 5.3. !Fixing systems of fixed guards and fixed covers shall remain attached to these parts or to the machine when the parts are removed." 5.2.1.4 Safeguards at crushing, shearing, drawing-in, trapping and friction points are not required, if the maximum force of moving parts is limited to 150 N and the contact pressure is limited to 50 N/cm2. 5.2.1.5 The surface of an area where the operator is standing for recurring manual intervention shall be even and steps, slopes and protruding parts shall be avoided according to EN ISO 14122-1. 5.2.2 Electrical equipment 5.2.2.1 The electrical equipment shall be in accordance with EN 60204-1. With respect to some clauses of !EN 60204-1:2006", stated hereafter, the following shall apply: 4.3:
A.C. supplies: 4.3.2 applies without the note; 6.2: Protection in accordance with 6.2.2 or 6.2.3 and, where applicable, 6.2.4; 9.2.5.3/4: stop function and emergency stop: Category 0 or 1; SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 18 9.4: the safety related parts of the control system shall meet the requirements of 5.2.6.1 and 5.2.6.2 of this document; !!!!11.3"""": degree of protection: IP 43, when using electronics e.g. printed circuit boards: IP 54. 5.2.2.2 All operating control devices requiring frequent adjustment for altering process settings shall be located outside the electrical cabinet. 5.2.3 Hot surfaces Hot surfaces within reach which are not directly required for the working process shall be avoided or safeguarded against accidental contact such that the temperatures of the burn threshold for the material concerned and a contact time of less than 1 second, given in !EN ISO 13732-1", are not exceeded. 5.2.4 Noise reduction 5.2.4.1 Noise control at the design stage When designing the machine the available information and technical measures to control at source the noise from machine parts, tools, hydraulic, pneumatic and extraction equipment shall be taken into account, according to EN ISO 11688-1.
NOTE EN ISO 11688-2 gives useful information on noise generation mechanisms in machinery. Examples for noise control measures are: a) reduction of vibrations through static and dynamic balancing of the rotating parts; b) reduction of vibrations within the machine by reducing both the mass of the moving parts and their acceleration; c) reduction of impactive over-clearance of rotational bearings by application of positive pre-loading; d) proper choice and design of energy transfer components to eliminate bouncing; e) proper choice and design of transmission components (gears, pulleys, belts, bearings etc.); f) design of the machine structure which takes account of vibration, damping and avoiding structural resonances, in particular coating of deflection rollers at scouring bands with damping rubber or felt; g) fitting pneumatic exhaust silencers. The above list is not exhaustive. Other noise control measures with the same or better efficiency can be used by a manufacturer. 5.2.4.2 Noise reduction by information If measures taken at the design stage are known to be insufficient to reduce noise emission to an acceptable level, then the manufacturer shall give information on means to reduce noise further (see 7.3). 5.2.5 Dust detrimental to health Shoe repair machines where the working process creates dust may be hazardous to health shall be fitted with an integral extraction system or with connections for an external system.
SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 19 Reduction of risk to health from dust shall be carried out by observing the state of the art, Clause 6 of
EN 626-1:1994 and Annex D of this document. 5.2.6 Control systems 5.2.6.1 Control systems shall comply with the following general requirements: electrical systems: 5.2.2 of the present document and Clause 9 of !EN 60204-1:2006"; pneumatic systems: the requirements of EN 983; for hydraulic systems: the requirements of EN 982. 5.2.6.2 !The safety related parts of the control system shall as a minimum conform to performance level "b" as defined in EN ISO 13849-1." 5.2.6.3 Means shall be provided to prevent uncontrolled starting of motors or movement of presses caused by failure or unexpected reconnection of power supply. For the pneumatic and hydraulic systems this means can be for example a pressure switch. 5.2.6.4 To avoid unintended operation foot-actuated controls, which actuate hazardous motions, control systems shall be fixed to the frame of the machine and shall be safeguarded by a bridge shaped cover which prevent unintended actuation by the operator or falling objects. 5.2.6.5 When selecting a bridge shaped cover for two or more foot-actuated controls the distance between the pedals shall be more than 150 mm or, if less, a vertical divider shall be fitted between them. 5.2.7 Pressurized fluid systems Equipment of hydraulic and pneumatic systems shall satisfy 4.10 of EN ISO 12100-2:2003, EN 982 and
EN 983. 5.2.8 Ergonomics When designing shoe repair machines basic ergonomic principles of 4.8 of EN ISO 12100-2:2003 shall be considered. 5.3 Requirements for specific shoe repair machines NOTE Following requirements apply also when the specific machine is integrated in a modular system. 5.3.1 Finishing machines for manual scouring, brushing, polishing and trimming operations 5.3.1.1 All rotating axles and shafts as well as tool shafts, nuts, bolt heads and fixing equipment, shall be safeguarded by fixed enclosing guards which satisfy EN 953. Loose rolls around axles and shafts are considered acceptable if they are designed and fitted such that its touch causes an immediate standstill of it. Shaft ends do not need safeguarding if: they have a circular section; their surface is smooth; their exposed length does not exceed ¼ of their diameter or in case of bayonet catch 15 mm. SIST EN 12387:2005+A1:2009
EN 12387:2005+A1:2009 (E) 20 If the exposed length in case of a bayonet catch exceeds 15 mm a solution can be a bayonet cover designed to be used with the loose roll. 5.3.1.2 Except for the section of the tools that is strictly for the work, scouring and polishing tools shall be safeguarded either by: interlocking guards according to EN 953, EN 1088 and Annex A.2 or
fixed guards according to EN 953 and Annex A. Taking into account the technical constraint of the work, a hinged guard with key locking is considered acceptable. The guard opening at the area of action shall comply for shoe repair finishing machines with Annex F, Figure F.1, and for orthopaedic finishing machines with Annex F, Figure F.2. 5.3.1.3 Where the tool consists of an abrasive wheel, for sharpening the trimmer the wheel shall be protected as much as possible by a fixed guard. Detailed requirements are still under consideration, but for the moment being, the following is considered to be a minimum. a) The guard shall be made of steel, with a thickness of minimum 1,5 mm; b) The guard shall be constructed and fitted in such a manner that in case of bursting flying parts shall be diverted downwards; c) The opening of the guard shall be limited to ≤ 120°. NOTE More information can be found in EN 13218. 5.3.1.4 Naumkeag equipment shall be so designed, that pick-up attachm
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