**Calculation of Weaving Loom Efficiency**

**Loom Efficiency:**

If we define

**loom efficiency**then we can say that, the average number of picks per minute inserted by a loom expressed as a percentage of what is theoretically possible if the machine were running continuously.

Calculation of Weaving Loom Efficiency |

Actual Production

**Loom Efficiency (%)**=

**………………………….**X 100

Calculated Production

A second approach, which gives the same answer, is to consider running times:

Actual running time

**Loom efficiency (%)**=

**……………………….......……….**X 100

Actual running time + stopped time

It is the stopped time that management try to minimize by appropriate choice of yarns, preparation of warp and weft, loom selection and maintenance, training of operatives , supervision, etc.

**Example:**

**Find out the loom efficiency from the following data,**

- Loom speed = 180 picks/min
- Repair of warp breaks per 100,000 picks = 20 occasions
- Repair of weft breaks per 100,000 picks = 15 occasions
- Other repairs with loom stopped per 100,000 picks = 6 occasions
- Average warp-repair time = 0.85 min
- Average weft-repair time = 0.30 min
- Average time for other repairs = 0.12 min

**Solution:**
First, we want to find out the running time per 100,000 picks

Running time for 100,000 picks =100,000/loom speed

=100,000/180 = 555.5min

Stopped time for warp breaks = 20 x 0.85 =17 min

Stopped time for weft breaks = 15 x 0.30 = 4.5 min

Stopped time for other repairs = 6 x 0.12 = 0.72 min

Total time for machine stoppage = 17 + 4.5 + 0.72 = 22.22min

Total time to weave 100,000 picks =555.5 + 22.22 = 577.72 min

Actual running time

Actual running time + stopped time

555.5

=

555.5 + 22.22

= 96.16%

This efficiency value does not take into account time lost for such matters as major mechanical breakdown, waiting for new warp and gaiting new warp, type new warp to old warp.

Running time for 100,000 picks =100,000/loom speed

=100,000/180 = 555.5min

Stopped time for warp breaks = 20 x 0.85 =17 min

Stopped time for weft breaks = 15 x 0.30 = 4.5 min

Stopped time for other repairs = 6 x 0.12 = 0.72 min

Total time for machine stoppage = 17 + 4.5 + 0.72 = 22.22min

Total time to weave 100,000 picks =555.5 + 22.22 = 577.72 min

**Hence, the loom efficiency:**Actual running time

**Loom efficiency (%)**=**………..............……………………….**X 100Actual running time + stopped time

555.5

=

**……...…....…..**X 100555.5 + 22.22

= 96.16%

**(ANS)**This efficiency value does not take into account time lost for such matters as major mechanical breakdown, waiting for new warp and gaiting new warp, type new warp to old warp.