- If you convert 6.5 hours into seconds, the total production seconds are 23,400 seconds.
- If the total production time of the day is divided by the total output of the day: 23,400 seconds / 29,500 sheets = 0.79 seconds per sheet . Â
- When we compare the actual print time per 0.79 second to the standard 0.45 seconds, the efficiency is: 0.45 seconds / 0.79 seconds x 100% = 56.9% . In conclusion, the efficiency of the second day on the second day is only 56.9% , which is far from the standard 100% . Â
The author does not intend to subtract the downtime (2 hours ) from the actual production time. The reason is: Â
i) Remove the operator's lazy excuse.
Ii) Encourage operators to care about machine performance and reduce downtime.
Iii) Encourage operators to increase efficiency and reduce downtime.
The formula is as follows: Â
A) Standard time = standard output per hour / 3600 seconds Â
B) Actual output = 12 hours - 〔 (1.5 hours of ink exchange x times ) + (0.5 hours of change x times ) x 3600 seconds] / actual production Â
C) Efficiency = A ( standard time ) / B ( actual output ) x 100%
Therefore, we can set a standard output of 12,000 sheets per hour for Roland900 and 2 hours for ink change . In contrast, the Speed master 's standard output is 6,000 , and the standard ink change time is one hour. The above methods can also be applied to plastic, oil, beer machines and other departments to learn their actual and objective production efficiency. 
Although the above diagram disturbs the line of sight we analyze (the following will analyze each printer independently ) , it is not difficult to find several phenomena:
- can be found in four Japanese aircraft more efficient and more October 24 plunge in the night of October 10, must therefore believe that external factors than human factors, such as power failures, floods caused by heavy rain, air conditioning failure Wait. Â
- In addition, the efficiency on Saturdays and Sundays is lower than usual. It may be due to lack of supervision. Â
In general, the night's efficiency of the printing presses is more efficient than that of the day. The reason is that there is no plug-in at night, and work can be done according to schedule. Â
i) Machine A :
- between October 6 date, day, night and more efficiency are reduced, the reason is mechanical failure.
- After mid- October , their performance has improved, mainly due to the large number of prints and the low number of transfers. Â
- Overall, night performance is better than daily. Â
Ii) Machine B
- Although the performance of the day is more stable, it is inefficient ( less than 80%) . If the problem is due to the captain's skill level, the chart will fluctuate greatly. If the problem is a machine malfunction, the day and night chart will be affected. So the above two inferences can be negated.
——If we look up the “Production Daily Report†again, we can see that there is a large number of inserts on the No. 2 machine at Nisshin, which affects its performance. If you compare this data with other plug-in machines, you can see that all the operators of No. 2 machine have done their best to maximize the efficiency. In fact, its performance is better than other machines. Â
- Of course, the efficiency of the night is better than the day, but every Monday, the efficiency must be less than 80% , mainly the captain's official holiday, the second car is not qualified for the captain. Â
Iii) Machine C
Looking at the breakdown of various machines, press C ( including day and night ) performed best and most consistently. The main problems are external factors and the lack of supervision on Sunday.