KNECHT S 20 User manual

Status 01.2019 Version 2.0 | Translation
Operating Instructions
Universal Wet-Sharpening Machine
S 20 | S 20 B

3
S 20 | S 20 B Universal Wet-Sharpening Machine
Manufacturer
KNECHT Maschinenbau GmbH
Witschwender Straße 26
88368 Bergatreute
Germany
Phone [phone]
Fax [phone]
[email protected]
www.knecht.eu
Documents for the machine operator
Operating Instructions
Date of issue of the operating instructions
January 03, 2019
Copyright
The copyright for these operating instructions as well as other documents for the machine operator is held
by KNECHT Maschinenbau GmbH. These documents will be delivered only to our customers and to opera-
tors of our products and are a part of the machine.
These documents may neither be reproduced, nor made accessible to third parties, including rival firms.
Operating Instructions

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1. Important notes 7
1.1 Foreword 7
1.2 Warnings and symbols in the operating instructions 7
1.3 Warning plates and their meaning 8
1.3.1 Warning and prohibition signs on/in the grinding machine 8
1.3.2 General mandatory signs 8
1.4 Rating plate and machine serial number 9
1.5 Figure and item numbers in the operating instructions 10
2. Safety 11
2.1 Basic safety instructions 11
2.1.1 Observe notes in the operating instructions 11
2.1.2 Operator’s duty 11
2.1.3 Obligations on the part of the personnel 11
2.1.4 Hazards associated with the handling of the machine 11
2.1.5 Malfunctions 12
2.2 Proper use 12
2.3 Warranty and liability 12
2.4 Safety regulations 13
2.4.1 Organisational measures 13
2.4.2 Protective devices 13
2.4.3 Informal safety measures 13
2.4.4 Selection and qualifications of the personnel 13
2.4.5 Machine control system 14
2.4.6 Safety measures in normal operation 14
2.4.7 Dangers due to electrical power 14
2.4.8 Particular danger zones 14
2.4.9 Servicing (maintenance, repair) and fault rectification 15
2.4.10 Structural alterations to the grinding machine 15
2.4.11 Cleaning the grinding machine 15
2.4.12 Oils and greases 15
2.4.13 Relocation of the grinding machine 15
3. Description 17
3.1 Use as intended 17
3.2 Technical specifications 17
3.2.1 General 17
3.2.2 S20 (type with grinding wheel) 17
3.2.3 S20 B (type without grinding wheel) 18
3.3 Functional description 19
3.4 Description of the assemblies 20
3.4.1 Control panel 21
Table of Contents

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3.4.2 Grinding arm (S 20) 21
3.4.3 HV 201 dressing tool (S 20) 22
3.4.4 Grinding and polishing unit for wet-grinding belt and finned brushes 22
3.4.5 Coolant Unit 23
3.5 Functional description of units 24
4. Transport 25
4.1 Transport aids 25
4.2 Transport damage 25
4.3 Transport to another installation site 25
5. Installation 26
5.1 Selection of qualified personnel 26
5.2 Installation site 26
5.3 Supply connections 26
5.4 Settings 26
5.5 Initial commissioning of the grinding machine 27
6. Commissioning 28
7. Operation 30
7.1 General principles of grinding technology 30
7.2 Switching on the grinding machine 31
7.3 Grinding linear and sickle-shaped cutter knives on the wet-grinding belt (S 20) 31
7.3.1 SP 107 grinding plate 32
7.3.2 Mounting the cutter knife 34
7.3.3 Adjusting the cutter knife on the grinding plate 36
7.3.4 Adjusting the grinding angle to the grinding wheel 36
7.4 Grinding linear and sickle-shaped cutter knives on the wet-grinding belt 37
7.4.1 Mounting the grinding plate for grinding on the wet-grinding belt 37
7.4.2 Mounting the cutter knife 39
7.5 Deburring the cutter knife with the finned brushes 44
7.6 Grinding circular knives on the grinding belt (S 20) 45
7.6.1 Adjusting the circular knife on the grinding plate 47
7.6.2 Adjusting the grinding angle to the grinding wheel 47
7.7 Grinding of hand knives 48
7.8 Dressing the grinding wheel (S 20) 49
7.9 Adjusting the grinding wheel guard (S 20) 50
7.10 Changing the grinding wheel (S 20) 50
7.11 Changing the wet-grinding belt 51
Table of Contents

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7.12 Belt control 52
7.13 Changing the finned brushes 53
8. Care and maintenance 54
8.1 Cleaning 54
8.2 Lubrication schedule and lubricant table 54
9. Malfunctions 55
9.1 Faults 55
10. Disassembly and disposal 56
10.1 Disassembly 56
10.2 Disposal 56
11. Service, spare parts and accessories 57
11.1 Postal Address 57
11.2 Service 57
11.3 Spare parts 57
11.4 Accessories 58
11.4.1 Abrasives used 58
12. Appendix 59
12.1 EC Declaration of Conformity 59
Table of Contents

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1.1 Foreword
These operating instructions are meant to make it easier to get to know the Universal Wet-Sharp-
ening Machine, referred to in this document as grinding machine, and to use it properly for the
intended purpose.
The operating instructions contain important information on how to operate the grinding machine
safely, properly and cost-effectively. Observance of these instructions helps to avoid dangers, re-
pair costs and downtimes, and increases the reliability and service life of the grinding machine.
The operating instructions must always be accessible at the place of use of the grinding machine.
The operating instructions must be read and used by all persons entrusted with working on the
grinding machine, e.g. those entrusted with
• Transport, installation, commissioning
• Operation, including troubleshooting in the process flow, as well as
• Servicing (maintenance, repair).
In addition to the operating instructions and the binding accident prevention regulations applica-
ble in the country and place of use of the machine, the generally acknowledged rules of technol-
ogy with regard to safe and professional work practices are to be observed.
1.2 Warnings and symbols in the operating instructions
Heeding the following safety alert symbols/designations used in the operating instructions is
absolutely necessary:
The hazard triangle with the signal word “CAUTION” is used as a work
safety indication for all work which could result in death or physical injury.
Special care and caution must be taken when carrying out such jobs.
ATTENTION
The signal word “ATTENTION” is used to call attention to hazards which
could result in damage and/or destruction of the grinding machine or its
environment if special attention is not paid while carrying out particular
jobs.
NOTICE The signal word “NOTE” calls attention to tips on use and useful
information.
1. Important notes
CAUTION

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1.3 Warning plates and their meaning
1.3.1 Warning and prohibition signs on/ in the grinding machine
The following warning and prohibition signs have been affixed to the grinding machine:
CAUTION! DANGEROUS ELECTRICAL VOLTAGE (warning
notice on the switch cabinet)
On being connected to the voltage supply (3x 400 V), the grinding
machine becomes electrically live and touching its live parts directly
could be life-threatening.
Live machine parts may be opened only by authorised, trained
personnel.
The grinding machine must be separated from the mains supply
before carrying out servicing, maintenance and repair jobs on it.
CAUTION! RISK OF INJURY FROM ABRASIVE PARTICLES
(warning notice on the machine bonnet)
Grinding, polishing, deburring and truing gives rise to abrasive
particles which could enter the eyes.
Wearing safety glasses is mandatory when carrying out such jobs.
1.3.2 General mandatory signs
The following general mandatory signs must be observed:
CAUTION! RISK OF INJURY ON THE BLADE
Work on the grinding machine involves the sharpening of knives
which could cause serious cut injuries due to their sharpness.
Protective gloves must be worn when clamping and unclamping
the knives.
Be careful when transporting blades. Use the protective devices
provided by the knife manufacturer. Wear protective gloves and
apron.
1. Important notes

TYPE S 20
Universal Nass-Schleifmaschine
Bauj. 2018
Masch.-Nr.
Motor
029046120
Schleifantrieb
V 400 A Gew. kg1802,94
KW 1,15 Hz 50 Sch. Y
V 400 n1 n22860
KW A1,1 2,75 Hz 50 Sch. Y
KNECHT Maschinenbau GmbH
Witschwender Strasse 26
88368 Bergatreute Germany
07527-928-0 www.knecht.eu
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1.4 Rating plate and machine serial number
The type plate is located on the rear panel of the
machine.
The machine number can be found on the type
plate and on the right side panel underneath the
wet-grinding belt.
NOTICE Rating plate and machine serial number vary
depending on machine type.
1. Important notes
Figure 1-2 Machine serial number (S20)
Figure 1-1 Rating plate (S20)

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1.5 Figure and item numbers in the operating instructions
If a component of the machine that is shown in a figure is described in the text, it is followed by a
figure or item number in brackets.
Example: (6-2/1) denotes figure number 6-2, item 1.
Check the direction of rotation of the finned brushes.
The direction arrow (6-2/1) indicates the direction of
rotation of the wet-grinding belt / finned brushes. If the
finned brushes are rotating in the right direction, then the
direction of rotation of the grinding wheel and of the wet-
grinding belt too is correct.
If the direction of rotation of the finned brushes is incor-
rect, have the phase reversed by a qualified electrician.
Figure 6-2 Check the direction of rotation
1
1
1. Important notes

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2.1 Basic safety instructions
2.1.1 Observe notes in the operating instructions
The basic prerequisite for the safe handling and uninterrupted operation of this grinding machine
is knowledge of the basic safety instructions and regulations.
• These operating instructions contain important notes on how to operate the grinding machine
safely.
• All persons carrying out work on the grinding machine must follow these operating instructions,
in particular the safety notices.
• In addition, the accident prevention rules and regulations applicable at the place of use of the
machine must also be observed.
2.1.2 Operator’s duty
The operator is obliged to allow only those persons to work on the grinding machine, who
• are familiar with the basic occupational safety and accident prevention regulations and have
been trained and instructed in the handling of the grinding machine,
• have read the operating instructions, particularly the “Safety” section, and have read and
understood the warning notes. They have given a signed confirmation of this in writing.
It is also checked at regular intervals as to whether the worker is fulfilling his employee obligation
to observe safety at work.
2.1.3 Obligations on the part of the personnel
All the personnel working on the grinding machine shall be obliged to
• observe the basic occupational safety and accident prevention regulations,
• read the operating instructions, particularly the “Safety” chapter, and the warning notes. They
shall give a signed confirmation of this in writing.
2.1.4 Hazards associated with the handling of the machine
The grinding machine has been built to the latest technological standards and the acknowledged
rules of technical safety. In spite of that, its use presents inherent risks which could result in bodily
harm or even death of the user or third persons, or impairment of the grinding machine or other
property.
The grinding machine may be used only:
• for the intended purpose, and
• in faultless condition with regard to safety-relevant aspects.
2. Safety

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2. Safety
Faults that could impair safety must be eliminated immediately.
2.1.5 Malfunctions
If safety-relevant malfunctions occur in the grinding machine, or if the processing behaviour
indicates that such malfunctions may have occurred, the grinding machine must be stopped
immediately until the malfunction has been found and eliminated.
Allow only authorised technical staff to eliminate the malfunctions.
2.2 Proper use
The grinding machine can be used universally for all common varieties of cutter knives, as well as
circular knives, hand knives and other cutting tools.
Other than hand knives (e.g. butcher knives), all the knives must be clamped to suitable grind-
ing plates. Before starting work on a flat knife, it must be checked whether the knife fits on the
grinding plate. Only then may the knife be mounted on the grinding plate.
Any other use is considered improper use. KNECHT Maschinenbau GmbH does not assume any
liability for damages resulting from improper use. The user alone bears the risk in such cases.
Use as intended includes the observance of all the instructions in the operating instructions.
The grinding machine is being used improperly, if, e.g.,
• flat knives are sharpened without grinding plate.
• devices are not fastened properly.
• knives are sharpened/ polished in opposite direction of the cutting edge on the wet-grinding
belt or the finned brushes.
2.3 Warranty and liability
Warranty and liability claims in case of personal injuries or property damage are excluded if such
damage is attributable to one or more of the following causes:
• improper use of the grinding machine,
• improper transportation, commissioning, operation and maintenance of the grinding machine,
• operating the grinding machine with defective safety devices, or improperly attached or mal-
functioning safety and protective devices,
• ignoring the operating instructions with regard to transportation, commissioning, operation,
maintenance and repair of the grinding machine.

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• unauthorised structural alterations to the grinding machine,
• unauthorized modification, e.g. of the drive conditions (power and speed), and
• insufficient monitoring of machine parts that are exposed to wear.
• use of unapproved replacement and wear parts
Use only original replacement and wear parts. If parts are purchased from external suppliers, it
cannot be guaranteed that they will be constructed and manufactured to withstand the stresses
and provide the level of safety required for operating the grinding machine.
2.4 Safety regulations
2.4.1 Organisational measures
All the existent safety devices must be checked regularly.
Observe prescribed intervals for recurring maintenance work or as specified in the operating
instructions.
2.4.2 Protective devices
Before putting the grinding machine in operation, it must be ensured that all the protective devices
are properly mounted and in functional condition.
Protective equipment may be removed only after the machine has stopped and has been secured
against accidental restarting of the grinding machine.
If spare parts are supplied, the protective equipment must be correctly attached by the operator
according to the instructions.
2.4.3 Informal safety measures
The operating instructions must be permanently available at the place of use of the grinding
machine. In addition to the operating instructions, the generally applicable as well as the locally
relevant accident prevention regulations must also be made available and observed.
All the safety alert symbols and danger warnings on the grinding machine must be complete and
clearly legible.
2.4.4 Selection and qualifications of the personnel
Only trained and instructed personnel may work on the grinding machine. The minimum legal
age for employment must be observed.
The responsibilities of the personnel must be clearly assigned, i.e. commissioning, operation,
maintenance and repair, etc.
2. Safety

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Personnel still in the training or instruction phase may only be allowed to work on the grinding
machine under the permanent supervision of an experienced person.
2.4.5 Machine control system
Only trained and instructed personnel is allowed to switch on the machine.
2.4.6 Safety measures in normal operation
Refrain from any method of working which may pose a risk to safety. Only operate the grinding
machine if all the safety devices are installed and fully functional.
Check the grinding machine for external signs of damage and correct operation of the safety
devices at least once every shift.
Report any changes (including operating behaviour) immediately to the competent depart-
ment/person. Where required, shut down the grinding machine immediately and secure against
restarting.
Before switching on the grinding machine, ensure that no one is exposed to any risk from the
start-up of the machine.
If there are any functional faults, immediately stop the machine and secure against restarting.
Have the faults eliminated immediately.
2.4.7 Dangers due to electrical power
Work on electrical units or operating materials may only be performed by a qualified electrician in
accordance with electrical rules.
Defects, such as damaged cables, cable connections, etc., must be immediately rectified by an
authorised electrician.
Cables marked in yellow are electrically live even when the main switch
is in off position.
CAUTION
2.4.8 Particular danger zones
In the area of the grinding wheel, wet-grinding belt and finned brushes, there is a hazard of
pinching and being drawn in (e.g. clothing, fingers and hair). Suitable personal protective equip-
ment must be worn.
2. Safety

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2.4.9 Servicing (maintenance, repair) and fault rectification
Maintenance work is to be carried out on schedule by trained personnel. Inform operating
personnel before starting repair work. The responsible supervisor is to be named.
For all service work, the grinding machine is to be disconnected from the power supply and
secured against accidental restarting. Pull out the mains plug. Cordon off the servicing area, as
far as possible.
After completion of the maintenance work and fault rectification, install all the safety devices and
check whether they are fully functional.
2.4.10 Structural alterations to the grinding machine
Modifications, retrofitting or rebuilds of the grinding machine are not allowed without the per-
mission of the manufacturer. This also applies to the installation and adjustment of safety devices.
No alterations may be carried out without prior written permission from KNECHT Maschinenbau
GmbH.
Immediately replace machine parts which are not in perfect condition.
Use only original replacement and wear parts. If parts are purchased from external suppliers, it
cannot be guaranteed that they will be constructed and manufactured to withstand the stresses
and provide the level of safety required for operating the grinding machine.
2.4.11 Cleaning the grinding machine
Cleaning agents and materials used must be handled properly and disposed of in an environmen-
tally friendly manner.
Ensure that wear and replacement parts are disposed of in a safe and environmentally friendly
way.
2.4.12 Oils and greases
When handling lubricants/oils and greases, follow the safety regulations for the product. Observe
special instructions for the foodstuffs sector.
2.4.13 Relocation of the grinding machine
Even when moving the machine a short distance from its site, disconnect it from all external
power supply sources. Before restarting the machine, connect it properly to the current supply.
When loading or unloading, only use hoisting and load lifting equipment with sufficient
load-bearing capacity. Appoint a qualified banksman (signaller) for the lifting process.
No persons other than those entrusted with this work may be present in the loading and
installation area.
2. Safety

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2. Safety
Only lift the grinding machine correctly with a suspension device in accordance with the operat-
ing instructions (attachment points for load suspension devices, etc.). Only use suitable transport
vehicles with sufficient load-bearing capacity. Attach the load securely. Use suitable attachment
points. When putting in operation again, proceed only as instructed in the operating instructions.

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3. Description
3.1 Use as intended
The Universal Wet-Sharpening Machine S 20 | S 20 B is meant for grinding, deburring and polish-
ing all commonly used cutter knives as well as circular knives, hand knives and other cutting tools.
3.2 Technical specifications
3.2.1 General
Current supply* ������������������������������������������������������������ 3x 400 V
Mains frequency* �������������������������������������������������������������� 50 Hz
Power* ������������������������������������������������������������������� 1.17 kW
Power consumption* �������������������������������������������������������� 1.61 kW
Back-up fuse ������������������������������������������������������������������� 16 A
Measured A-evaluated emission sound pressure level ����������������������������� 77 dB (A)
at workstation LpA**
3.2.2 S20 (type with grinding wheel)
Height ������������������������������������������������������������ approx. 1400 mm
Width ������������������������������������������������������������� approx. 1300 mm
Depth ������������������������������������������������������������� approx. 1700 mm
Space requirement (WxD) ��������������������������������������������� 1300 x 2000 mm
Weight ���������������������������������������������������������������������� 180 kg
Energy consumption* ��������������������������������������������������������� 2.79 A
Diameter of finned brushes ������������������������������������������������� d. 200 mm
Speed of wet-grinding belt/finned brushes ������������������������������������ 1500 rpm
Diameter of grinding wheel ������������������������������������������������ d. 200 mm
Speed of grinding wheel ����������������������������������������������������� 350 rpm

approx. 1300 mm
approx. 1400 mm
approx. 1700 mm approx. 1300 mm
approx. 1400 mm
approx. 1700 mm
SP SP
18
Figure 3-1 Dimensions in mm (S20)
3.2.3 S20B (type without grinding wheel)
Height ������������������������������������������������������������ approx. 1300 mm
Width ������������������������������������������������������������� approx. 1050 mm
Depth ������������������������������������������������������������� approx. 1700 mm
Space requirement (WxD) ��������������������������������������������� 1300 x 2000 mm
Weight ���������������������������������������������������������������������� 160 kg
Energy consumption* ���������������������������������������������������������� 2.7 A
Diameter of finned brushes ������������������������������������������������� d. 200 mm
Speed of wet-grinding belt/finned brushes ������������������������������������� 1500 rpm
*) This data may vary depending on the electrical power supply.
**) Dual number noise emission value according to EN ISO 4871 (measurement uncertainty KpA. 3 dB(A)).
Emission sound pressure level according to EN ISO 11201.
A K24 cutter knife by KNECHT Maschinenbau GmbH was ground.
3. Description

approx. 1050 mm
approx. 1300 mm
approx. 1700 mm approx. 1050 mm
approx. 1300 mm
approx. 1700 mm
SP SP
19
Figure 3-2 Dimensions in mm (S20B)
3. Description
3.3 Functional description
The universal wet-sharpening machine can be used to grind, deburr and polish linear, sickle-
shaped and circular knives.
All knives other than hand knives must be clamped onto grinding plates and must be ground on
the grinding wheel as well as the wet-grinding belt with the relevant units.
The grinding angle on the grinding wheel can be infinitely adjusted. The grinding angle on the
wet-grinding belt can be adjusted using various spacer disks.
Knives can be deburred and polished on the finned brushes.

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3. Description
3.4 Description of the assemblies
1 Grinding arm (S 20)
2 Grinding wheel (S 20)
3 Finned brushes
4 Control panel
5 Knife guide carriage
6 Belt control
7 Wet-grinding belt
8 Grinding and polishing unit for wet-grinding belt and finned brushes
9 Coolant dosing unit for wet-grinding belt
10 Water tank
11 HV 201 dressing tool for S 20 grinding wheel
12 Machine feet
1
2
3
5
4
10
12
6
7
9
8
11
Figure 3-3 General view of the S 20 grinding machine

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3. Description
1 Holder for HV 201 dressing tool
2 Tool box
3 Rating plate
3.4.1 Control panel
1 Coolant pump ON/OFF
2 Main switch ON/OFF
3 Units ON/OFF
3.4.2 Grinding arm (S 20)
1 Hand wheel for angle adjustment
2 Clamping and rotating unit
3 Grinding arm
4 SP 107 grinding plate
Figure 3-5 Control panel
Figure 3-4 Rear view
Figure 3-6 Grinding arm
1
2
3
1 2 3
1 2
3
4