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Sicherheit für Pressmaschinen
Safety Light Curtain for Press Machine | Type 4 SIL 3 Certified
Always pre-empt amputations and crush injuries on mechanical, hydraulic and servo press: choose our ENT Series safety light curtain for Type 4 protection with SIL 3 integrity – TV-certified, factory-direct from QJKH.
- Resolution 14 / 25 / 45mm
- Reaktionszeit 6.0ms
Type 4 SIL 3
Sicherheitsbewertung
Up to 70m
Detection Range
IP65
Protection
TÜV Certified
Verification
Press Machine Hazards — How Safety Light Curtains Protect Your Operators
A safety light curtain is the best way to keep your press operators out of harm’s way. OSHA data confirms that 49% of mechanical press injuries are amputations – a figure that’s flat for 10 years. Yearly, 18000 American workers have fingers, hands or arms severed on unguarded presses.
Root cause: unguarded point-of-operation access or bare minimum guarding on press tables. They duck into the die space to load, reposition or remove parts – but a press stroke can be complete in 30 thousandths of a second. Safety barriers block access – but frustrate workflow.
How a Safety Light Curtain Works
Infrared beam barrier:
A transmitter transmits 12 feed IR beams to a receiver in the threat zone
Presence sensing:
When the beams are broken by hand, finger or foot, the controller halts the press in less than 10ms
Permanent self-testing:
The IEC 61496 Type 4 curtains check themselves each scan cycle – if they fail they shut the press down
No physical interstice:
“No doors or covers to open-and-close, no mechanical parts to diminish”
Industrial Safety Light Curtain vs Traditional Press Guards
Press safety guarding falls into a handful of categories: light curtains, physical guards, two-hand controls, or laser scanners. Each has a use case – but presses with high frequency operator access favor non-contact presencesensing equipment, which beats mechanical options hands down on throughput and operator comfort.
| Merkmal | Type 4 Light Curtain (ENT) | Physical Guard / Barrier | Two-Hand Control | Sicherheitslaserscanner |
|---|---|---|---|---|
| Reaktionszeit | 6.0–12ms | N/A (fixed barrier) | 15–30ms | 40–80ms |
| Coverage Area | Up to 1,800mm height × 70m range | Fixed opening only | Operator hands only | Floor plane, 2D scanning |
| Operator Access | Unrestricted (non-contact) | Open/close door (3–8 sec/cycle) | Beide Hände besetzt | Unrestricted (floor zone) |
| Cycle Time Impact | None — instant reset | +3–8 sec per cycle | None (operator constrained) | +0.5–2 sec (scan delay) |
| Maintenance Interval | 10+ years (no moving parts) | 1–3 years (hinges, interlocks) | 2–5 years (switches) | 5–10 years |
| Installation Time | 2–4 hours (bracket mount) | 8–16 hours (fabrication + wiring) | 1–2 hours | 4–8 hours |
| Approx. Cost (per point) | $400–$2,500 | $800–$5,000 | $150–$600 | $2,000–$8,000 |
Bottom line: safety light curtains remove the access penalty that physical guards impose. For a press running 200+ cycles/hr, eliminating 5 seconds of door-open/close time per cycle equates to a 16+minute/hr gain in actual production. That’s 2.1 hours per shift, per press.
Where Each Technology Fits Best
Light curtain
Manual load/unload stamping, punching, forming presses
Physical guard
Fully-automatic presses, with operators in the cell outside production hours
Zweihandsteuerung
Small table-top press with a dedicated, single operator
Laser scanner
Large robotic cells requiring floor-level area monitoring
Non-contact presencesensing also mean fewer service issues. Door switches and mechanical interlocks have a number of parts that wear, corrode, and ultimately fail – often without anyone ever catching it. An IP65-rated-light curtain with no moving parts can go over 10 years in a stamping environment without necessitating replacements.
Press Machine Safety: An ROI Framework for Reducing Injuries
Safe guarding applications are inherently risk-mitigation exercises. The question is how fast an investment in a risk-reducing system can cost-justify when compared against a single injury incident.
Press Machine Safety — Return on Investment
$67K
Direct cost per press injury
$670K
Total cost including indirect
12–24 mo
Typical payback period
Ledje (American Society of Safety Professionals) cites the average incurred cost of Medically Consulted workplace injury. For amputations – the most frequent press injury – that number rises to 280hollows Snag ($44,000) direct and an estimated 47shives $670,000 when adding up all the other mitigation costs like workers’-comp, OSHA, legal, replacement, productivity, and insurance.
Application-Specific ROI Drivers
Stamping press:
Very high cycle usage (300-600 SPM) exponentially increases risk exposure as every cycle without guarding is effectively a liabilityHydraulic press:
Much slower cycle but significantly higher force-based injury severityPunch press:
Small die footprint profile dictates finger-sensing detection to prevent the most common injury typePress brake:
Close mounting distance to the sheet work zone using ENT-14 mounts without restricting sheet movementQJKH Factory-Direct Advantage
Western brands tend to distribute through several additional layers that insert 35-70% markup then perform the installation. We sell factory direct from our Hangzhou shop, offering the same savings with the sameTV-certified Type 4 SIL 3 that make your procurement dollar stretch months farther.
Typical installation savings from factory direct pricing on a 10-press stamping line would fund an additional safety device for your press brake. This upgrade can be a plant-wide safety enhancement–without exceeding your planned spend.
Stamping Press Safety | Type 4, SIL 3, Cat. 4, PL e Certified
Safety light curtain with no third-party certification can be dangerous, not safe. Your safety risk assessment, your insurance company and your OSHA officer will all need documentation indicating the device has been tested to certain performance parameters. The ENT Series has all the certifications the press applications require.
✓ IEC 61496 Type 4
✓ IEC 61508 SIL 3
✓ ISO 13849 Cat. 4 PL e
✓ OSHA Compliant
✓ ANSI B11.19
✓ CE Marked
✓ TÜV Verified
✓ IP65 bewertet
What Each Standard Means for Press Safety
- IEC 61496 Type 4:
- The highest class of electro-sensitive safety equipment that is self-monitoring during operation, has signal processing redundancy, and is fail-safe. Type 2 equipment will only detect a fault during the initialization; Type 4 equipment will detect faults during every scan cycle.
- IEC 61508 SIL 3 (Safety Integrity Level 3)—
- probability of dangerous failure per hour is between 10 and 10. This is the required rating for high risk press applications where one failure results in amputation.
- ISO 13849 Category 4, PLe:
- the best performance level – the safety function remains intact even when 2 faults occur simultaneously within the system. Category 3 will accept 1 fault, category 4 will accept 2 faults.
- OSHA 29 CFR 1910.217:
- The applicable U.S. federal standard for press machine point-of-operation guarding. Requires presence-sensing devices that meet specific response time and self-monitoring requirements—all of which Type 4 light curtains comply with.
- ANSI B11.19:
- Performance requirements for safeguarding – covers the selection, installation and validation of safety devices for metalworking machines.
- CE / TV:
- CE mark indicates CE approval of the European Machinery Directive. TV approval indicates independent test lab from Germany proved our design files, test procedures, and manufacturing quality system.
- IP65:
- Full dust ingress protection and protected against water jet damage – equally important in stamping environments where metal particulate, coolant mist and hydraulic fluid spray are encountered.
Safety Distance Calculation
“Incorrect installation distance of a safety light curtain is by far the most common error we encounter. Too close and the operator’s hand arrives at the die before the press has been de-energized and moved out of reach, too far and you lose valuable working space. IEC 13855 establishes the calculation:”
Minimum Safety Distance Formula (ISO 13855)
S = (K × T) + C
- S = Minimum safety distance (mm)
- K = Hand approach speed—(2000mm/s for resolution 40mm; 1600mm/s for resolution >40mm)
- T = Total stopping time (seconds)= light curtain response+mch stopping time
- C = Supplementary distance based on resolution (8 × (d − 14) mm, minimum 0)
Calculation Example: ENT-14 on Mechanical Press
- ENT-14 response time: 6.0ms
- Mechanical press brake stopping time: 100ms
- Total stopping time (T): 0.106 seconds
- K = 2,000 mm/s (resolution 14mm ≤ 40mm)
- C = 0mm (14mm − 14 = 0)
“We tested our ENT series through 5,000-hour accelerated aging, EMC interference, and IP65 ingress testing in our Hangzhou lab — every unit ships with the same TÜV test report that validates the design.”
Safety Sensors for Press Machines: A Complete Procurement Guide
We do not publish published price lists as the price of a safety light curtain is a function of 5 factors that are different for every project. What we guarantee: factory direct from our Hangzhou factory will remove 30-50% of the distributor markup you pay when buying similar Type 4 SIL 3 certificated products from the West.
1
Resolution Class
14mm (finger) more expensive than 45mm (body) due to higher beam density and tight tolerance manufacturing.
2
Protection Height
The taller curtains (to 1,800mm) will need additional emitter/receiver pairs. Standard heights are available to ship from stock; custom heights available.
3
Erkennungsentfernung
Extended-range units (50m+) use more powerful optics. Most press applications are under 5m if it is not the expensive range.
4
Order Volume
Pricing for single-unit (small OEMs) vs pricing for 10+ unit (middle OEMs) vs pricing for 100+ OEM program. As enters a higher volume level, the unit cost drops 15-30%.
5
Accessories & Relay
Sample component bundling: SRB-2A1B safety relay, mounting brackets, M12 cables, alignment mirrors all in one package to reduce overall system cost.
6
OEM Customization
Provide Custom protection height, Cable length, Firmware Param, and Private Labeling for OEM press builders.
Kostenloses Musterprogramm
We send evaluation units to pre-qualified buyers free of charge. You test the ENT on your press, validate the safety distance calculation, confirm the PLC integration and then order production. No deposits, no purchase commitments.
What OEM Press Builders Get
•
Product protection height is designed according to your press stroke and die area.
•
Private-label options: your brand on the housing, your part numbers in the documentation
•
Pre-configured muting/blanking parameters for your specific feeding mechanism
•
Offering dedicated application engineering support for safety distance calculations and CE documentation
•
Consignment inventory programs for high-volume OEM accounts (50+ units/year)
Häufig gestellte Fragen
What type of safety light curtain do I need for a hydraulic press?
For hydraulic presses with manual hand-feeding, the ENT-25 (25mm resolution, hand detection) meets IEC 61496 requirements in most risk assessments. If operators’ fingers approach the die area directly, step up to the ENT-14 (14mm resolution). Your risk assessment per ISO 12100 determines the required resolution — we provide free application reviews to confirm the correct model. For multi-sided hydraulic presses fed from two or three directions, the ENT cascading system links multiple light curtain pairs through a single safety controller, and reflective columns redirect beam planes around corners to guard additional access points without extra sender-receiver pairs. This multi-point configuration is common in automotive stamping cells and appliance manufacturing lines where press operators load from the front while automated systems feed from the side or rear.
How do I calculate the safety distance for a light curtain on a press?
Use the ISO 13855 formula: S = (K × T) + C. K is the hand approach speed (2,000 mm/s for ≤40mm resolution). T is total stopping time (light curtain response + press brake time). C is the supplementary distance based on beam resolution. For an ENT-14 on a mechanical press with 100ms stopping time: S = 2,000 × 0.106 + 0 = 212mm. We include a calculation worksheet with every quotation.
What is the difference between Type 2 and Type 4 safety light curtains?
Type 2 light curtains perform self-diagnostics only at startup and at set intervals — a fault between checks goes undetected. Type 4 light curtains (like the ENT Series) perform continuous self-monitoring on every scan cycle. For press machines — where a single point-of-operation failure causes amputation — OSHA and ISO 13849 require Type 4. Type 2 is acceptable only for low-risk applications like packaging machine access points.
Can safety light curtains be used with muting for automated press feeding?
Yes. The ENT Series includes programmable muting capability that disables detection temporarily whenever an automated feeder (coil feed, transfer arm) enters the beam field. Muting is allowed in the series only if external muting sensors (not the operator) detect the presence of the feeder. Manual safety cycles are unaffected. No software – the ENT Series muting is customizable with our IR one-button programming, standard safety features without software access.
Are QJKH safety light curtains compatible with Siemens/Allen-Bradley PLCs?
The ENT Series offers dual-channel PNP or NPN OSSD outputs – fundamental digital safety inputs for safety PLC PCUs to connect directly to Siemens S7 F-series, Allen-Bradley GuardLogix, Pilz PNOZ, and other safety controllers with 24V DC inputs. We provide detailed wiring diagrams for Siemens, Rockwell, and Mitsubishi applications with each unit.
What certifications should a press machine safety light curtain have?
Minimum: IEC 61496 Type 4, ISO 13849 Category 4 Performance Level e, and IEC 61508 SIL 3. For U.S. facilities: OSHA 29 CFR 1910.217 compliance is compulsory. CE labeling is demanded for European markets. TÜV (type verification) demonstrates an independent laboratory proven the manufacturer’s claims. The ENT Series passes these and more. Never buy a safety light curtain without a downloadable TÜV or third-party test report – the safety is in the documentation.
How much does a safety light curtain system cost?
A Type 4 safety light curtain system including the sensors, safety relay, installation, and cabling costs from $500 to $3,500 based on resolution, protection height, and detection distance. Western brands purchased through distributors generally cost 30-50% more than factory direct manufacturers like QJKH with comparable specs. Larger volume purchases (10 or more units) cuts unit price 15-30%. Contact us for a custom quote – we answer within 24 hrs.
Do safety light curtains meet OSHA requirements for press machines?
Yes – Type 4 safety light curtains lawfully satisfy OSHA 29 CFR 1910.217 rules for point-of-operation protection on hydraulic and mechanical presses. OSHA requires presence sensing devices to know immediately before the point of operation if anyone or anything is in the beam field, continually test for silent faults internally, and have dual-channel output and redundant diagnostics. The ENT Series meets all three mandates with dual-channel OSSD output and full Type 4 diagnostics.
Can I bypass a safety light curtain for setup and maintenance?
Avoid detaching or taping over safety light curtain sensors to bypass safeguards; such actions violate OSHA regulation and leaves only mid-air unprotected. For true setup use, the ENT Series provides a key switch override allowing the operator to insert a physical key and run in inch/jog mode only (single stroke, slow down) with no save monitoring. Blanking lets stationary tooling be moved within the beam field without compromising safety.
Do you offer free samples for testing?
Yes. We ship free evaluation units to qualified buyers — 30 days, no purchase obligation. Contact our team to arrange a sample.
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