1.the thickness of required leather sheets is adjusted by hand-wheel. 2.when any gate or cover is not closed to right position, or the charging basket is overfilled.The dynamo can-not start up and the red light will flash to alarm, which is highly secure. 3.The thickness of leather adopts accurate and conve-ninet digital display,the minimum thickness can reach 0.15mm and the sheet precision is ±0.05mm. 4.Charging rate is adjustable as required and adopts digital display. 5.The knife grinding abrasive wheel is adjusted by hand-wheel.The upper and lower abrasive wheels grind synchronously, and the knife can restore position during the course of grinding, which makes grinding geometric shape remains unchanged.