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Unscramblers, Even-Enders, and Lug Loaders Explained

On its way to the trimmer, a sawmill has to turn a jumbled stream of boards back into single boards, each lined up on a common end and seated one per lug on the chain that carries it past the scanner and the saws; unscramblers, even-enders, and lug loaders do that work. UTEC Industrial designs, engineers, machines, fabricates, and installs custom material handling systems for aerospace and heavy industry from its Spokane Valley, WA facility, integrating Allen-Bradley PLC and motion control with in-house CNC machining, heat treating, and stress relief. This article explains what each of the three machines does and where it sits, why the trimmer line can limit mill output, what OSHA accident records show about guarding and restart, which federal rules apply, and the sensing and controls that run the line. Like every handling machine, each one is also the product of a build chain, design → engineering → parts machining → fabrication → assembly → weld fatigue → stress relief → drives → controls → tuning → monitoring, and the last links of that chain decide whether the trimmer gets one clean board per lug.

Where do unscramblers, even-enders, and lug loaders sit in a sawmill?​

The sawmill material-flow article maps the whole mill from log yard to planer; these three machines work on one short stretch of it, the infeed to the trimmer, and the stacker at the end of the line is covered in the lumber stacking article. Boards from the breakdown and edging machines arrive on chain transfers as an uneven mat. They leave on a lug chain as single boards, one per lug, and pass a scanner into the trimmer, which OSHA's Sawmills eTool describes as the machine that trims rough stock to length, width, or both. Along that stretch, the unscrambler separates the mat into single boards, an even-ending step brings every board to a common end line, and the lug loader places each board into its own lug.

Trimming itself is within the federal sawmill standard, whose scope under 29 CFR 1910.265(a) includes log and lumber handling, sawing, trimming, and planing. The stretch is not only machines. The same eTool page pictures workers at a trim saw feed table and a trim saw infeed table with a barrier between worker and saws, and an OSHA accident record describes a grader sorting lumber at the infeed to the trimmer saws, the case a later answer returns to (OSHA eTool: Sawmills, Trimmer Saws; OSHA 29 CFR 1910.265-2016: Sawmills, §1910.265 paragraph a; OSHA Accident Summary No. 170361638).

What does a lumber unscrambler do?​

An unscrambler takes boards as the transfers deliver them, overlapped, crossed, or bunched together, and separates them into a single layer moving one board at a time. It is the first point on the trim line where the mill handles individual pieces again. OSHA's Sawmills eTool pictures an inclined unscrambling conveyor among its conveyor images, and its conveyor page names the hazard such machines share: workers' limbs may get caught in unguarded shafts, shaft ends, spiked live rolls, or nip points. The machine is not confined to the trimmer infeed either: an OSHA accident record describes an employee who had been placing sticks on lumber stacks built by a stacker machine and then climbed down under an unscrambler through an opening by an electrical disconnect panel.

In engineering terms, the failure an unscrambler exists to prevent is two boards travelling as one, overlapped or riding on each other. An OSHA record of a 2013 sawmill fatality describes an event at an edger: an employee was pushing a piece of lumber through an edger when a second piece entered, and the first piece ejected from the machine and struck him in the lower chest and abdomen; he died. As an engineering reading, the edger sits upstream of the trim line, and the failure mode in that record, a second piece entering a machine while the first is still in it, is the one the unscrambler is placed to remove before the boards reach the trimmer (OSHA eTool: Sawmills, Conveyors and Additional Conveyor Images; OSHA Accident Summary No. 127637.015; OSHA Accident Summary No. 50746.015).

What does an even-ender do before the trimmer?​

The name describes the job. An even-ender moves each board endwise until one end reaches a common reference line across the chain, so the scanner and trimmer work from a known end position instead of wherever the board happened to land.

Where boards are driven endwise on powered rolls, three federal rules reach that motion: 1910.265(c)(18)(ii), which requires spiked live rolls to be guarded; 1910.219(f)(3), where the rolls are driven through sprockets and chains; and 1910.212(a)(1), whose machine-guarding duty lists ingoing nip points among its hazards. The sawmill conveyor and deck safety article sets out all three with their full conditions.

In engineering terms, a board that reaches the trimmer off the line can be trimmed at the wrong place, which costs value, or it can foul the saws, which is a safety event (OSHA 29 CFR 1910.265-2016: Sawmills, §1910.265 paragraph c.18; OSHA 29 CFR 1910.219, §1910.219 paragraph f.3; OSHA 29 CFR 1910.212-1974, §1910.212 paragraph a.1).

What does a lug loader do?​

A lug loader times each board into an empty space between the lugs of the chain that carries it through the scanner and the trimmer, so that every lug carries exactly one board. The lugs are attachments on conveyor chain, and ASME standards cover three conveyor-chain families: ASME B29.200-2001 (R2021) for welded-steel mill and drag chains, ASME B29.15M-1997 (S2025) for roller-type conveyor chains, and ASME B29.12M-1997 (S2025) for bushed rollerless chains; each standard covers attachments and sprocket teeth alongside the chain. The sawmill material-flow article covers these chains on the green end, and the American Chain Association's Standard Handbook of Chains gives guidance on selecting, designing, using, and maintaining chains for power transmission and material handling.

Two lug-loader faults reach the trimmer:

  • An empty lug. The trimmer's capacity for that lug is lost and cannot be recovered downstream.
  • A doubled or crossed lug. Two boards, or one board lying across a lug, reach a scanner-driven trimmer that is set up to measure and cut one board per lug. The OSHA edger record in the unscrambler answer above shows what happened when a second piece entered a machine while the first was still being fed through it, although that case was at an edger, not a trimmer.

In engineering terms, both faults are why the loader matters more than its size suggests: it is the last machine that can correct a board before the scanner sees it (ASME B29.200-2001 R2021; ASME B29.15M-1997 S2025; ASME B29.12M-1997 S2025; American Chain Association 2005; OSHA Accident Summary No. 50746.015).

Why can the trimmer line limit sawmill output?​

A trimmer can only cut the boards it is given, so the machines that feed it share its capacity. Thoews, Maness, and Ristea built a flow-simulation model of a sawmill and found that the trimmer was the bottleneck of the whole system when the mill's small-log and large-log lines ran at the same time. When the model raised the trimmer's capability, the bottleneck moved to the edger. The changes the mill then made at the trimmer centre produced an actual 10% increase in lumber volume output.

As an engineering reading, not a finding of the study, that result puts the unscrambler, the even-ender, and the lug loader on the critical path of a line whose limit is the trimmer: every empty lug is lost trimmer time, and every jam at the unscrambler stops the one machine the mill cannot afford to stop. It is also a reason to study the edger and the trim line together, since in that model raising the trimmer's capability moved the limit to the edger (Thoews, Maness, Ristea 2008, Maderas. Ciencia y Tecnología 10(3), pp. 229–242).

Why does scanner-based trimming depend on how boards are presented?​

Trim optimization is a per-board calculation, and it is only as good as the board the scanner is shown. Regalado, Kline, and Araman report that the first part of their continuing study, in three hardwood sawmills, found actual lumber value from manually operated edging and trimming to be 62 to 78 percent of the optimum, and concluded that significant value increases can be expected from optimizing hardwood edger and trimmer systems. Their 1992 paper adds that, because board defect scanners have limited capability, not all the defect information needed for the best edging and trimming decision can be scanned.

Schmoldt, Song, and Araman then showed what the computer needs. Their optimizer depends on board data from a scanning system, and in their tests a branch-and-bound method reached the maximal solution for 92% of boards and 99% of the total maximal value. Both studies are hardwood research, and the Schmoldt system is a research prototype, so neither is a statement about a production softwood trim line. As an engineering reading, the dependency they show still applies to a softwood line: an optimizer that solves one board at a time needs the feed machines to deliver one board at a time, singulated, on a known end line, and in its own lug (Regalado, Kline, Araman 1992, Forest Products Journal 42(3), pp. 29–34; Schmoldt, Song, Araman 2001, Proceedings of ScanTech 2001, pp. 87–99).

What does an OSHA trimmer-ejection case show about trim-line guarding?​

OSHA's accident record 170361638 describes a 1994 case at a sawmill trimmer infeed. An employee working as a grader, sorting lumber at the infeed to the trimmer saws, was struck in the chest when a trimmer saw in normal operation propelled a board out of the infeed side of the machine with great force. He suffered a bruised heart, a collapsed lung, and broken ribs, and was hospitalized. The board had a saw kerf along most of its length, which the record says indicated that the saw drove the board out of the machine. The employee was doing his normal job and did not know what had hit him.

The federal trimmer rule addresses flying debris directly. Under 1910.265(e)(4)(ii):

  1. Trimmer saws must be guarded in front by adequate baffles to protect against flying debris, securely bolted to a substantial frame, and for a series of saws the guards must be set as close to the top of the trimmer table as is practical.
  2. The end saws on the trimmer must be guarded.
  3. The rear of the trimmer saws must have a guard the full width of the saws and as much wider as practical.

OSHA's Sawmills eTool restates the same front, end, and rear guards on its trimmer-saws page and lists flying particles or loose materials striking workers as a trimmer hazard. The record puts a person on the infeed stretch where the unscrambler, even-ender, and lug loader sit. As an engineering reading for layout, any station on that stretch sits in the trimmer's infeed ejection path unless the front baffles and the station layout keep it out (OSHA Accident Summary No. 170361638; OSHA 29 CFR 1910.265-2016: Sawmills, §1910.265 paragraph e.4; OSHA eTool: Sawmills, Trimmer Saws).

What does the 2023 OSHA unscrambler fatality show about troubleshooting and restart?​

OSHA's accident record 159377.015 describes an unscrambler death on August 23, 2023. An employee was troubleshooting an unscrambler malfunction and walked around to the bottom of the machine's support frame, near two parallel drive chains. A coworker restarted the machine, and the employee was pulled in by the drive chains and killed. OSHA's keywords for the case include lockout/tagout, troubleshooting, and pulled in.

An earlier OSHA record, 127637.015, follows a similar sequence. In 2020 a coworker stopped a stacker machine that was building lumber stacks when it started to rain. An employee stayed behind, climbed down under an unscrambler through an opening by an electrical disconnect panel, and sat on a chain conveyor. When the rain stopped, one of the returning workers started the machine again, and the conveyor pulled the employee against the back of the machine; he died from his injuries.

The rules for that task are specific:

  • Coverage. OSHA 1910.147(a)(1)(i) covers servicing and maintenance where the unexpected energization or start-up of the machine, or release of stored energy, could injure employees. Servicing during normal production operations is covered only if an employee must remove or bypass a guard or other safety device, or place any part of the body into the point of operation or an associated danger zone during a machine operating cycle, under (a)(2)(ii)(A)–(B); minor servicing that is routine, repetitive, and integral to production is excepted when alternative measures give effective protection.
  • Isolation. Under 1910.147(c)(1), the energy control program must ensure that before servicing a machine where unexpected energizing, start-up, or release of stored energy could cause injury, the machine is isolated from its energy source and rendered inoperative.
  • Who restarts. Under 1910.147(e)(3), each lockout or tagout device must be removed by the employee who applied it, except under the documented employer procedure the paragraph allows when that employee is not available.

In both records, a coworker restarted the machine while a person was within its reach. As an engineering reading, troubleshooting a malfunction or waiting out a stop is time on a stopped machine that someone else can restart, so the procedure, the isolation points, and the controls have to make a restart by someone else impossible while a person is inside (OSHA Accident Summary No. 159377.015; OSHA Accident Summary No. 127637.015; OSHA 29 CFR 1910.147-1989, §1910.147 paragraphs a, c.1, and e.3).

Which federal rules and standards apply to these machines?​

The federal sawmill standard, 29 CFR 1910.265, names no unscrambler, even-ender, or lug loader. OSHA's Sawmills eTool pictures an inclined unscrambling conveyor among its conveyor images but does not name even-enders or lug loaders, so the rules apply by function: conveyor, live roll, trimmer infeed, power transmission, or servicing.

  • Sawmill standard. Under 1910.265(c)(18), conveyors must be built, operated, and maintained to ANSI B20.1-1957, incorporated by reference, and spiked live rolls must be guarded. The conveyor safety standard has since been reissued as ASME B20.1-2024, so a specification should state which edition it means. Trimmers fall under 1910.265(e)(4), including safety stops or hangers on automatic trimmers so the saws cannot drop onto the table.
  • Walkways and platforms. Under 1910.265(c)(4)(iv), elevated walks, runways, or platforms 4 feet or more from the floor level must have a standard railing, except on the loading or unloading sides of platforms, and a standard toe board is also required where the height exceeds 6 feet.
  • Machine guarding and power transmission. 1910.212(a) sets the general machine-guarding duty, and 1910.219 covers the sprockets, chains, and shafting that drive these machines; the guarding answer below applies them, and the sawmill conveyor and deck safety article states them with their conditions.
  • Servicing. 1910.147 governs lockout and tagout during servicing and maintenance, with the coverage conditions given in the restart answer above.

OSHA describes State Plans as OSHA-approved workplace safety and health programs operated by individual states or U.S. territories; they are monitored by OSHA and must be at least as effective as OSHA in protecting workers and in preventing work-related injuries, illnesses and deaths. As an engineering reading, a mill that buys one machine design for several sites therefore needs the specification to name the rule set that applies at each site (OSHA eTool: Sawmills; OSHA 29 CFR 1910.265-2016: Sawmills, §1910.265 paragraphs c.4, c.18, and e.4; ASME B20.1-2024; OSHA 29 CFR 1910.212-1974; OSHA 29 CFR 1910.219; OSHA 29 CFR 1910.147-1989; OSHA State Plans, 2026).

How are drive chains, sprockets, and rolls guarded on unscramblers and lug loaders?​

These machines are built from chains, sprockets, and rolls running close to where people stand, and the guarding rules address both entanglement and a chain that breaks. Guard design that keeps maintenance access is covered in the machine guarding and maintenance access article. The IFC's sawmilling guideline notes that conveyors under high tension may break and that clothing or limbs can become entangled. Its recommendations include:

  • simple, clearly demarcated conveyor routes, with skirt boards to prevent access where needed;
  • moving gears, chains, and rollers fully enclosed;
  • hard hats where elevated conveyors run.

The federal rules for the drive include 1910.219(f)(3) for sprocket wheels and chains and 1910.212(a)(2) for how guards are affixed and secured; the sawmill conveyor and deck safety article states both with their full conditions.

The two unscrambler records show where guarding has to reach. In the 2023 case a person went to the bottom of the frame, near the drive chains, while troubleshooting a malfunction. In the 2020 case a person climbed under an unscrambler through an opening by a disconnect panel and sat on a chain conveyor; OSHA's Sawmills eTool captions a photo of a worker sitting on a belt conveyor as not a safe practice. As an engineering reading, a guard design for an unscrambler or lug loader has to close the openings that lead under the machine and allow jam clearing and inspection without putting a hand or body near a chain that could move (IFC EHS Guidelines, Sawmilling & Manufactured Wood Products, 2007, Sec. 1.2; OSHA 29 CFR 1910.219, §1910.219 paragraph f.3; OSHA 29 CFR 1910.212-1974, §1910.212 paragraph a.2; OSHA Accident Summary No. 159377.015; OSHA Accident Summary No. 127637.015; OSHA eTool: Sawmills, Conveyors).

What sensing, PLC control, and interlocks run an unscrambler-to-trimmer line?​

The intelligence layer on a trim-line infeed has one job: know where every board and every lug is, and stop the right machine when something is wrong. At a functional level that takes:

  • Board presence. Photoelectric or laser sensing at the unscrambler discharge, at the even-ending line, and at the lug loader tells the PLC whether a board is present and where it is.
  • Lug position. An encoder or proximity target on the lug-chain drive tracks each lug. The loader then releases a board only into an empty lug, and the trimmer can match each scan to the lug that carries it.
  • Jam detection. Comparing the expected board with the sensed one catches a missing, doubled, or skewed board before it reaches the saws.
  • Stops and warnings. The federal sawmill standard's start-up warning and interlock provisions are written for other machines, but they show the pattern. 1910.265(e)(2)(i)(c) requires provisions for alerting and warning employees before band head saws are started, and measures to ensure that all persons are in the clear. Under 1910.265(c)(26)(viii), the lower landing area of stackers and unstackers must be guarded by enclosures that prevent entrance to the area or pit below the hoist platform; entrances should be protected by electrically interlocked gates which, when open, disconnect the power and set the hoist brakes, and where the interlock is not installed, other positive means of protecting the entrance must be provided. In engineering terms, an interlocked access point that removes power when it is opened addresses the restart deaths in the two unscrambler records.
  • PLC and safety logic. Logix 5000 controller tasks can be configured as continuous, periodic, or event, and a periodic task executes automatically based on a preconfigured interval, so board tracking and interlocks can run on a fixed period. Stop and interlock functions belong on safety-related parts of the control system (SRP/CS): ISO 13849-1:2023 specifies a methodology and provides related requirements, recommendations and guidance for the design and integration of SRP/CS that perform safety functions, for high demand and continuous modes of operation, and does not apply to low demand mode of operation; ISO 12100:2010 specifies principles of risk assessment and risk reduction to help designers achieve safety in the design of machinery. IEC 60204-1:2016 applies to electrical equipment and systems to machines not portable by hand while working, including a group of machines working together in a co-ordinated manner, as a trim line is.

UTEC Industrial, a Rockwell Automation Recognized System Integrator, builds UL 508A control panels and integrates Allen-Bradley ControlLogix and CompactLogix control with VFD and servo drives into the handling systems it builds (OSHA 29 CFR 1910.265-2016: Sawmills, §1910.265 paragraphs c.26 and e.2; Rockwell Automation 1756-RM094N-EN-P-2025; ISO 13849-1:2023; ISO 12100:2010; IEC 60204-1:2016).

Where does the build chain decide how these machines perform?​

An unscrambler, even-ender, or lug loader is a wide, chain-driven frame that must hold several strands of chain, and their lugs, in step across the whole width of the line. Each link of the build chain affects whether it does:

  • Design and engineering set the board range the machine must separate, align, and load, and the loads it carries. Green sapwood can weigh up to about 1.9 times as much as the same wood kiln-dried, as the sawmill material-flow article works out.
  • Parts machining sets sprocket tooth form, shaft fits, and bearing bores. The ASME B29 standards cover sprocket teeth with the chains, so a sprocket can be specified to the same standard as the chain it drives.
  • Fabrication, weld fatigue, and stress relief decide whether a welded frame keeps its shaft lines parallel after machining and under continuous load cycling, which is why welded frames are stress-relieved before final machining.
  • Assembly and drives set chain tension and timing between strands.
  • Controls, tuning, and monitoring set the loader timing against the lug chain and trend jam counts and drive current over time.

Under 1910.219(p), all power-transmission equipment must be inspected at intervals not exceeding 60 days and kept in good working condition at all times, and shafting must be kept in alignment, free from rust and excess oil or grease, which makes alignment a maintenance requirement as well as a build one. For customer Gillingham Best, UTEC Industrial fabricated sawmill lumber stacking and material handling equipment (OSHA 29 CFR 1910.219, §1910.219 paragraph p; ASME B29.200-2001 R2021; ASME B29.12M-1997 S2025; USDA Forest Products Laboratory, Wood Handbook FPL-GTR-282).

What should a mill define before requesting an unscrambler, even-ender, or lug loader?​

A request for quotation for trim-line infeed equipment should carry the inputs that change the design:

  • Boards: thickness, width, and length range; species; and whether the line runs green or dry lumber. The Wood Handbook calls its green moisture values typical, with considerable variation within and between trees, so as an engineering choice the design takes the wet end of the range.
  • Downstream machine: the trimmer and scanner being fed, and how board and lug tracking is handed off between them.
  • People: where the operator stations sit relative to the trimmer's ejection paths, and what guarding protects them.
  • Maintenance: jam-clearing access, energy isolation points, and how a restart is prevented while someone is inside.
  • Jurisdiction: the federal rules above, 1910.265, 1910.219, 1910.212, and 1910.147, and the rule set that applies at each site.
  • Controls: PLC platform, network, safety functions, and sensing.

NIOSH adds a maintenance input. During 1982–2006, NIOSH investigated 185 fatalities related to installation, maintenance, service, or repair tasks on or near machines, equipment, processes, or systems, and failure to completely de-energize, block, and/or dissipate the energy source was a factor in 142 (77%) of the incidents. NIOSH recommends that lockout/tagout procedures be developed that are specific to each machine. As an engineering reading, the isolation points therefore belong in the request for quotation and the machine's documentation, not only in the mill's own procedures. UTEC Industrial performs factory acceptance testing and on-site commissioning, so these criteria can be written into the purchase order and demonstrated before the equipment ships (USDA Forest Products Laboratory, Wood Handbook FPL-GTR-282; NIOSH Publication No. 2011-156, 2011, pp. 1–2; OSHA 29 CFR 1910.265-2016: Sawmills; OSHA 29 CFR 1910.147-1989).

Related Articles

References​

  • OSHA. Employee Injured by Board Kicked Back by Trimmer Saw, Accident Summary No. 170361638. U.S. Department of Labor, 2026 (undated web documentation, accessed September 2026).
  • OSHA. Employee Is Struck and Killed by Piece of Lumber, Accident Summary No. 50746.015. U.S. Department of Labor, 2026 (undated web documentation, accessed September 2026).
  • OSHA. Employee Is Killed When Pulled Into Unscrambler Machine, Accident Summary No. 159377.015. U.S. Department of Labor, 2026 (undated web documentation, accessed September 2026).
  • OSHA. Employee Is Killed When Sawmill Chain Conveyor Starts Up, Accident Summary No. 127637.015. U.S. Department of Labor, 2026 (undated web documentation, accessed September 2026).
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  • OSHA 29 CFR 1910.219: Mechanical Power-Transmission Apparatus. U.S. Department of Labor, 1974 (as amended through 2004).
  • OSHA 29 CFR 1910.212-1974: General Requirements for All Machines. U.S. Department of Labor, 1974.
  • OSHA. State Plans. U.S. Department of Labor, 2026 (undated web documentation, accessed September 2026).
  • IFC EHS Guidelines: Environmental, Health, and Safety Guidelines for Sawmilling & Manufactured Wood Products. World Bank Group, 2007.
  • OSHA 29 CFR 1910.147-1989: The Control of Hazardous Energy (Lockout/Tagout). Occupational Safety and Health Administration, 1989.
  • DHHS (NIOSH) Publication No. 2011-156: Using Lockout and Tagout Procedures to Prevent Injury and Death during Machine Maintenance. National Institute for Occupational Safety and Health, 2011.
  • Thoews SE, Maness TC, Ristea C (2008). "Using flow simulation as a decision tool for improvements in sawmill productivity." Maderas. Ciencia y Tecnología, 10(3), 229-242.
  • Regalado C, Kline DE, Araman PA (1992). "Value of defect information in automated hardwood edger and trimmer systems." Forest Products Journal, 42(3), 29-34.
  • Schmoldt DL, Song H, Araman PA (2001). "Real-Time Value Optimization of Edging and Trimming Operations for Rough, Green Hardwood Lumber." Proceedings of ScanTech 2001 International Conference, 87-99. Wood Machining Institute.
  • ASME B29.200-2001 (R2021): Welded-Steel-Type Mill Chains, Welded-Steel-Type Drag Chains, Attachments, and Sprocket Teeth. ASME, 2001.
  • ASME B29.15M-1997 (S2025): Steel Roller Type Conveyor Chains, Attachments, and Sprocket Teeth. ASME, 1997.
  • ASME B29.12M-1997 (S2025): Steel Bushed Rollerless Chains, Attachments, and Sprocket Teeth. ASME, 1997.
  • American Chain Association. Standard Handbook of Chains: Chains for Power Transmission and Material Handling, 2nd ed. CRC Press, 2005. ISBN 9781574446470.
  • ASME B20.1-2024: Safety Standard for Conveyors and Related Equipment. ASME, 2024.
  • Rockwell Automation 1756-RM094N-EN-P-2025: Logix 5000 Controllers Design Considerations. Rockwell Automation, 2025.
  • ISO 13849-1:2023: Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design. International Organization for Standardization, 2023.
  • ISO 12100:2010: Safety of machinery — General principles for design — Risk assessment and risk reduction. ISO, 2010.
  • IEC 60204-1:2016 (Ed. 6.0): Safety of Machinery -- Electrical Equipment of Machines -- Part 1: General Requirements. International Electrotechnical Commission, 2016.
  • USDA Forest Products Laboratory. Wood Handbook: Wood as an Engineering Material, FPL-GTR-282. USDA Forest Service, 2021.

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