Clearing Jams on Production Machines

A jam is when ordinary production turns dangerous. The machine has stopped, the line is waiting, and the fix looks like a two-second reach. But a stopped machine can still hold energy, and clearing the jam can be the very thing that sets it moving. You need to know what a jam calls for, which tools keep your body out, and what to leave for someone else. None of this replaces lockout training or your plant's written procedures.

What You Will Be Able to Do

• Explain why jams hurt people, even when the machine is stopped.
• Decide when lockout is required and when the minor servicing exception could apply.
• Pick the right tool to clear a part without reaching in.
• Find and control stored energy on a jammed machine.
• Recognize a stuck die or stalled press, and hand it off.

Why Jams Hurt People

Several things make jam clearing more dangerous than it looks:

• The machine may be waiting, not stopped. Many machines pause on a sensor. Remove the jam, the sensor clears, and the cycle carries on.
• Energy is still there. Air, hydraulic pressure, springs, and gravity can all move parts after power is off.
• The part itself may be under load. A wedged part or a tight strip can spring free.
• You are in a hurry. Pressure to get running is when people skip steps.

Lockout Is the Default

OSHA's lockout rule, 29 CFR 1910.147, treats unjamming a machine as servicing. Lockout/tagout keeps the machine from starting or energizing while someone's body is in the danger zone. During production, the rule applies when you must do either of these:

• Remove or bypass a guard or other safety device.
• Put any part of your body in the point of operation, or in a danger zone around it during a cycle.

So any time you enter the die area or reach in to clear a jam, the machine is locked out. Your lock. Your key.

The Minor Servicing Exception

There is one narrow exception. Minor tool changes, adjustments, and other minor servicing during normal production fall outside the lockout rule only if all of these are true:

1. The task is routine, meaning a regular part of the job.
2. It is repetitive, meaning it recurs as part of production.
3. It is integral, meaning essential to production.
4. It is done using alternative measures that give effective protection.

Examples of alternative measures include specially designed tools, remote devices, interlocked barrier guards, and local disconnects or control switches under the sole control of the person doing the work. A plain stop button or selector switch by itself is generally not enough.

This decision is not yours to make at the machine. Your employer decides which tasks qualify and writes them into a procedure. If the jam you are facing is not on that list, treat it as a lockout job.

Remember that an interlock or a light curtain protects you in normal running. Neither one is a lockout.

Tools That Keep Hands Out

Use a tool so that your hands never enter the die. The right one depends on the part.

Three rules apply to all of them:

1. A tool is not a guard. OSHA says hand tools only add to guarding, and they never replace it. Guards stay in place.
2. Use the plant's tools. A press employer must supply and enforce hand tools for freeing stuck work, under 1910.217(d)(1)(ii). A screwdriver or a piece of scrap is not an approved tool.
3. Account for the tool. A tool left in a die can be thrown out or break the die when the machine cycles. Keep tools in their marked holders.

Stored Energy on a Jammed Machine

Your lockout procedure lists every energy source. On a jammed machine, these are the ones people miss:

A machine is not ready until each source is controlled and you have checked that nothing can move.

Clearing a Jam Under Lockout

1. Stop the machine. Do not reset the fault yet.
2. From outside the guard, work out what has jammed and where.
3. Tell your lead and anyone else affected.
4. Shut down, isolate the energy, and put on your lock and tag. Each person working on it uses their own.
5. Release or block stored energy.
6. Verify. Try the normal start, confirm that nothing moves, and put the control back to off.
7. Clear the jam with an approved tool. Pull every piece, including small slugs and broken bits.
8. Inspect the tooling, sensors, and guards for damage.
9. Remove your tools, put the guards back, and tell people you are restarting.
10. Remove your lock, then restart by the slowest method available, such as single cycle.
11. Check the first part, because a jam can knock a setup out of position.
12. Log the jam: the time, the cause, how many parts were affected, and any damage.

Warning: Check twice that no one else is in the danger zone before removing your lock. Your lock protects whoever is in there, so you remove it only when everyone is clear.

Jams by Machine Type

Stuck Dies and Stalled Presses

Some jams are not an operator's job at all. If a press stalls at the bottom of its stroke, for example from a double blank, huge force is locked up in the frame and the die. The same goes for a die that will not open, or a mold that will not release.

Do not cycle it, jog it, pry at it, or reach in. Any of these can release that force all at once, or wreck the die.

1. Stop, and leave the controls alone.
2. Keep other people clear of the machine.
3. Call the die setter or maintenance.
4. Tell them exactly what happened and what you saw.

Those people work from a written procedure. On a mechanical power press, OSHA requires safety blocks whenever dies are adjusted or repaired in the press, under 1910.217(d)(9)(iv).

What Never to Do

• Never put your hand in a die or any point of operation, even with the machine stopped, unless it is locked out.
• Never rely on an E-stop, a stop button, or an open gate in place of lockout.
• Never reach past a light curtain, or block a sensor to hold the machine still.
• Never tape, wedge, or jump out an interlock or a two-hand control.
• Never use someone else's lock, or work under someone else's lock.
• Never cycle a press to knock a jam loose.
• Never clear a jam you have not been trained to clear.

When Jams Keep Coming Back

A jam that repeats is a symptom. Common causes are stock that is out of spec, worn or dull tooling, misaligned guides, a dirty or moved sensor, or feed timing that is off. Note each one in the log and raise it with your lead, so it can be fixed. "We always clear that by hand" is how injuries begin. A jam that happens often is no safer to reach into.

Check Your Understanding

1. A stamped part is stuck in a die. You could reach it with your fingers, and the ram is at the top. The press is stopped. What do you do?

Do not reach in. A stopped press is not a locked-out press. Use an approved tool from outside the guard if your procedure allows it. If not, lock it out first.

2. A coworker says the plant has a poke stick, so the press guard can stay open while they work. Is that right?

No. A hand tool adds to guarding and never replaces it. The guard must stay in place.

3. A carton jams at a photo eye on a packaging line. The line paused by itself. What is the hidden hazard?

The line may be waiting, not stopped. Removing the carton could clear the sensor and start the line. Follow the written procedure, or lock it out.

4. The press stops at the bottom of its stroke with two blanks in the die. What is your next step?

Stop, leave the controls alone, and call the die setter or maintenance. Do not jog, cycle, or pry at it.

5. After clearing a jam under lockout, the machine runs. Why check the first part?

A jam can shift tooling, damage the die, or knock a sensor out of place. The first part shows whether the setup is still good.

Key Takeaways

• Lockout is the default for any jam that puts your body in the danger zone or means opening a guard.
• The minor servicing exception is narrow, and your employer decides what qualifies.
• Use a poke stick, magnet, or pickoff so your hand stays out of the die.
• A hand tool never replaces a guard, and an E-stop never replaces lockout.
• Find stored energy before you touch the jam, and verify that nothing can move.
• Stuck dies and stalled presses go to the die setter or maintenance.