Filling Blockages and Uneven Feeding

Uneven feeding is the situation on encrusting and cutting machines that calls for the most care. The causes aren't necessarily complicated, but handling it wrong is dangerous: many occupational accidents with food machinery happen when someone reaches in to clear a jam while the machine is still moving or hasn't been powered off. So this article covers safety first, then causes.

How to Clear It Safely

The first step is always to stop the machine and cut the power.

1. Press stop, then turn off the power, unplug the machine, or cut the main switch.
2. When several people are working, lock the switch and hang a "Under maintenance, do not energize" tag, and the person clearing the jam keeps the key.
3. Make sure the machine has come to a complete stop, with the screw, conveyor belt, and cutting mechanism no longer turning.
4. For machines with stored-energy devices such as air pressure or springs, release residual pressure according to the operating manual.

Article 57 of Taiwan's Occupational Safety and Health Facilities Rules (職業安全衛生設施規則) requires that when machinery is being cleaned, oiled, inspected, repaired, or adjusted, the employer must stop operation and feeding and take measures such as locking out and posting signs to prevent accidental start-up; stored-energy devices with residual pressure must be depressurized or isolated; and if work must be done while the machine is running, hazardous areas must have guards or enclosures, or sufficiently long work tools must be used. Article 77 of the same Rules also states that before removing contents from a mixer or grinder, the machine should in principle first be stopped. The intent of these rules is clear: don't put your hands in while the machine can move.

Once the power is confirmed off:

• Remove the detachable parts such as the hopper and feed passage according to the operating manual.
• Clear out the jammed material with non-sharp, food-grade tools. Don't pry with a screwdriver or knife, which will scratch contact surfaces.
• Check what was jammed: large particles, tough stems or bone fragments, dried lumps, or a foreign object.
• Clean everything, reinstall the parts in their original positions and confirm they're tight, and only then remove the lock and tag and restore power.

Why Filling Jams

• Particles too large or uneven: Large particles get stuck at narrow points in the passage or nozzle.
• Tough stems, bone fragments, connective tissue: Uncut vegetable stems and poorly trimmed connective tissue in ground meat can wrap around parts or jam. See Meat Fillings (Adding Water, Mixing, Binding).
• Filling too dry or hard: High resistance to pushing, so the machine can't move it.
• Caked dry material: Residue from the previous batch dries out and blocks the passage.
• Hopper bridging: The filling forms an arch in the hopper; the bottom empties but the material above doesn't come down.
• Foreign objects: Packaging fragments, rubber bands, or glove fragments mixed into the ingredients.

What to Do If Particles Are Too Large

Particle size must be clearly smaller than the machine's feed passage and nozzle, and uniform; the exact upper limit varies by model, so follow the manufacturer's recommendation. You can improve this at the ingredient-processing stage: switch to a finer cutting plate on the chopping equipment, cut vegetable stems separately and more finely, and dice hard ingredients small beforehand. For details, see Filling Viscosity, Particle Size, and Moisture.

Prevention Beats Clearing

• Visually check ingredients for foreign objects and large pieces before loading.
• Keep filling firmness stable, and don't force a filling that's too dry. See Sweet Paste Firmness and Oil Content.
• Don't pack the hopper full all at once; replenish in small, frequent amounts.
• Clean thoroughly after every production run and don't leave residue overnight.

When to Call for Service

If feeding is still uneven after the jam is cleared, if there are abnormal noises, or if you find deformed or broken parts during disassembly, don't restart and force it. See When to Fix It Yourself vs. When to Call Service.

FAQ

Q: What should I do if filling is stuck in the machine?
A: Stop the machine, turn off the power and unplug it, and lock out and tag out. Once it has come to a complete stop, remove the detachable parts according to the operating manual and clear the jam with non-sharp tools.

Q: Can I reach in to clear it while the machine is still turning?
A: Absolutely not. Article 57 of Taiwan's Occupational Safety and Health Facilities Rules requires stopping operation and preventing accidental start-up during maintenance and cleaning.

Q: How small do filling particles need to be to avoid jamming?
A: Clearly smaller than the feed passage and nozzle, and uniform in size. The exact limit varies by model, so ask the manufacturer.

Q: What if feeding is still uneven after clearing the jam?
A: Don't force it to run. Note the machine model and the symptoms and contact the manufacturer or a service provider. Dong-Yih Machinery: 06-257-4644.