Rapier Loom: Working Principle, Types and Uses

Walk through a weaving shed that makes shirting, curtains, home textiles and suiting, and many of the machines you see will be rapier looms. They are known for flexibility. A rapier loom can handle fine yarn and coarse yarn, plain colours and many-coloured wefts, cotton, wool, silk, linen and synthetics. It does this at a steady speed, with gentle treatment of the yarn.

This guide explains the rapier loom in simple steps. You will learn how it inserts the weft, the main types, the parts, how to calculate its speed and production and how it compares with other shuttleless looms. For the first loom guide in this series, see our page on the air jet loom.

What is a rapier loom

A rapier loom is a shuttleless weaving machine. The weft yarn is carried across the width of the warp shed by a rod or a flexible tape, called the rapier, rather than by a shuttle. The rapier picks up the weft yarn from a package placed outside the loom, takes it into the shed and leaves it there. Then it returns empty for the next pick.

Old shuttle looms threw a heavy wooden shuttle that carried its own weft. This was noisy and slow, and it wore the yarn. Shuttleless looms such as rapier, air jet, water jet and projectile looms replaced them in most modern mills. To follow the broader steps of weaving, read our guide on the weaving process from yarn to fabric and the flow chart of weaving.

The basic working principle

All looms follow the same four main motions, whatever the weft insertion system.

1. Shedding. Heald frames or a jacquard lift some warp threads and lower others, creating an opening (the shed).
2. Picking. The weft is inserted through the shed. On a rapier loom, this is done by the rapier.
3. Beating up. The reed pushes the new weft against the fell of the cloth.
4. Let-off and take-up. The warp is released from the beam and the finished cloth is wound on, in step with the picks.

Our guide on the primary motions of a loom explains these in more detail.

How the rapier inserts the weft

On a typical double rapier loom:

1. A weft yarn is chosen by a selector at the side of the loom and held at the feeding side.
2. The feeding-side rapier, driven by a gear or a lever system, enters the open shed. Its head grips the end of the weft.
3. The rapier moves to the centre of the shed. At the same time, the receiving-side rapier enters from the other side.
4. The two heads meet in the middle. The weft is passed from the giving head to the taking head.
5. Both rapiers withdraw, and the taking rapier pulls the weft to the far side.
6. The yarn is cut at the feeding side. The reed beats the pick into place.
7. The shed closes and the cycle repeats, hundreds of times per minute.

This method is called the transfer system or Dewas system. Another system uses a single rapier that carries the weft across the full width and back.

Types of rapier looms

By the rapier type

Type	Description	Notes
Rigid rapier	A solid rod or bar enters the shed	Needs space on the side for the rod. Good for heavy fabric. Used mainly on older or special looms
Flexible rapier	A flexible tape, coiled around a wheel or stored in a guide	Needs less space, runs faster and is the usual choice on modern looms

By the number of rapiers

Type	How it works	Notes
Single rapier	One rapier carries the weft across the full width and returns	Older, simple, used for narrow or special fabrics
Double rapier	Two rapiers meet in the middle and transfer the weft	The most common. Faster, as each rapier travels only half the width

By the transfer system

System	Idea	Notes
Gabler system	The giving rapier carries the yarn tip, and the taking rapier receives it by clamping	Gentle on yarn, suitable for fine and delicate yarns
Dewas system	The giving head holds the weft in a loop and the taking head clamps it	Used with many yarn types, positive transfer
Tip transfer vs loop transfer	The weft is passed as a tip or as a loop	Affects the yarn it suits and the selvedge

Machine makers use different names and designs. When you buy a loom, ask for the transfer system used and the yarn range it can handle.

Main parts of a rapier loom

Part	Function
Warp beam	Holds the warp yarns
Let-off motion	Releases warp at the right tension
Back rest roller (whip roll)	Guides the warp and senses tension
Drop wires	Stop the loom when a warp yarn breaks
Heald frames or jacquard	Form the shed
Reed	Spaces the warp and beats in the weft
Rapier heads and tapes (or rods)	Carry the weft across the shed
Rapier drive	Gear, cam or servo drive that moves the rapiers
Weft selector	Chooses which weft is inserted
Weft feeder (accumulator)	Controls the weft supply and tension
Weft cutter	Cuts the weft at the feeding side
Tuck-in or leno selvedge device	Forms a neat edge
Take-up roller	Draws the fabric forward
Cloth roll	Collects the fabric
Electronic control	Handles speed, stops, pattern and data

For a general list, see our guide on the parts of a loom.

Speed and production

Rapier looms run at lower speed than air jet looms but give a high weft insertion rate. Speeds vary by make, width and fabric. A loom speed in the range of about 400 to 700 picks per minute is common for rapier looms. Check the maker’s data for your model.

Weft insertion rate (metres per minute) = picks per minute × reed space in metres

Loom production (metres per hour) = picks per minute × 60 × 0.0254 ÷ PPI × efficiency

Here PPI is picks per inch and 0.0254 converts inches to metres.

Worked example: production of one loom

A rapier loom runs under these conditions.

• Speed: 500 picks per minute
• Reed space: 190 cm = 1.9 m
• Fabric: 60 picks per inch
• Efficiency: 85 percent

Weft insertion rate

• 500 × 1.9 = 950 metres per minute

Production per hour

• Picks per hour = 500 × 60 = 30,000
• Length at 100 percent = 30,000 ÷ 60 = 500 inches = 500 × 0.0254 = 12.7 metres
• At 85 percent efficiency = 12.7 × 0.85 = 10.8 metres per hour

Production per day

If the loom runs 22 hours of the day in a mill that has changeovers and maintenance:

• 10.8 × 22 = 237.6 metres per loom per day

For 100 looms

• 237.6 × 100 = 23,760 metres per day

Worked example: weft yarn needed

• Reed space: 190 cm. Each pick travels about the reed space, plus a small waste for tails.
• Picks per metre of cloth = 60 × 39.37 = 2,362
• Weft length per metre = 2,362 × 1.9 = 4,488 metres (before crimp and waste)
• Weft yarn: 40s Ne cotton, tex = 590.5 ÷ 40 = 14.76
• Weight per metre of cloth = 4,488 × 14.76 ÷ 1,000 = 66.2 g

The weft yarn alone weighs about 66 grams per metre of cloth. Add warp weight and about 3 to 5 percent for waste to plan the yarn purchase. For weaving cost calculations, see our guide on the calculation of weaving cost and profit.

Advantages of a rapier loom

• Very flexible. Handles a wide range of yarns, from fine filament to coarse and fancy yarns.
• Easy to weave with many weft colours, often 8 or 12 or more, which suits stripes, checks and fancy shirting.
• Gentle on the weft yarn, which is useful for delicate and hairy yarns.
• Lower noise and vibration than shuttle looms.
• Lower power use than air jet looms, since there is no compressed air for weft insertion.
• Wide fabric widths possible, including very wide home textile fabric.
• Neat selvedges, with leno or tuck-in devices.
• Good for short runs and quick style changes.
• Works well with jacquard and dobby shedding for patterned fabrics.

Limitations of a rapier loom

• Slower than air jet looms for simple fabrics, so the output per loom is lower.
• More moving parts, so more wear on the rapier heads, tapes and drive.
• Needs careful setting of the transfer point in the centre of the shed.
• Costs more to maintain than some simple designs.
• Waste yarn at the selvedge, from the tail cut at the feeding side.
• Less suited to very high-volume plain fabrics where speed counts most.

Rapier loom compared with other looms

Point	Rapier	Air jet	Water jet	Projectile
Weft carrier	Rapier head and tape or rod	Compressed air	Water jet	Small gripper projectile
Typical speed	Medium	High	High	Medium
Yarn range	Very wide	Medium, best on spun and filament of fair strength	Hydrophobic filament (polyester, nylon)	Wide, good for heavy yarns
Weft colours	Many	Fewer (often up to 6 or 8)	Few	Few
Fabric width	Narrow to very wide	Narrow to wide	Narrow to medium	Very wide
Energy use	Lower	Higher (air)	Medium (water and pump)	Medium
Noise	Moderate	High	Moderate	Moderate
Fabric examples	Shirting, suiting, curtains, towels, denim, technical	Poplin, sheeting, denim, bulk fabric	Taffeta, linings, synthetic cloth	Canvas, heavy fabric, filter cloth

These are general trends. The best machine depends on your product and your volume. Compare cost per metre, not just machine speed.

Uses of rapier looms

• Shirting and blouse fabric with stripes and checks
• Suiting and wool fabrics
• Home textiles such as curtains, upholstery and bedding
• Terry towels (with special terry motion)
• Denim, in mills that want flexible weft options
• Silk and fine filament fabrics
• Carpet and technical fabrics
• Fancy fabrics woven with dobby or jacquard heads. See our guide to jacquard weave

Common faults and remedies

Fault	Likely cause	Remedy
Weft breaks at transfer	Wrong transfer timing, worn heads	Reset timing and replace heads
Missing pick	Weft not gripped, weak yarn	Check clamps, tension and yarn quality
Weft float or loop	Poor weft tension control	Adjust feeder and brake
Tape wear or breakage	Friction, dirt, wrong tension	Clean guides, replace tape, align
Selvedge defects	Wrong tuck-in or leno settings	Reset and check cutter
Warp breaks	Poor sizing, high tension	Check size, reduce shed height, clean reed
Reed marks	Bent or dirty reed	Replace or clean reed
Starting marks	Stop and start with loose beat-up	Use proper restart procedure
Shade bars	Mixed weft lots	Control lots at the creel
Rapier collision	Timing error	Check synchronisation and safety sensors

Maintenance tips

1. Clean the loom daily to remove fluff and dust, especially around the rapier path and sensors.
2. Lubricate as the maker advises, with the right oil and quantity.
3. Check rapier heads and tapes for wear every week, and replace on schedule.
4. Check the transfer timing after any repair.
5. Keep reeds, healds and drop wires in good order.
6. Record stops and causes, and review them weekly to find the biggest loss.
7. Train weavers and fitters on setting and troubleshooting. Training lowers stops and wasted time.

How to choose between loom types

Think about the fabric first.

• Many weft colours and fancy yarns: rapier.
• Large volumes of simple fabric at high speed: air jet.
• Filament synthetics: water jet.
• Very wide or heavy fabric: projectile or wide rapier.
• Small orders with frequent changes: rapier, because the changeover is quick.

Also consider power costs, air supply, yarn waste, spare parts and skilled staff. If you are new to weaving, a visit to a working mill gives a better feel than any brochure. For a simple look at hand weaving before machines, see our page on the handloom.

Final thoughts

The rapier loom is the all-round machine of modern weaving. It may not be the fastest, but it is flexible, gentle and good for variety. Understand how the rapier passes the weft, plan production with real numbers and keep the transfer point and tapes in good order. Then the loom will repay you with steady, high-quality fabric across a wide range of styles.

Frequently asked questions