A rolling mill for producing rolling mill product is provided. The rolling mill includes a rolling mill line that moves the rolling mill product. A plurality of rolling mill stands are coupled to the rolling mill line that receives the rolling mill product and rolls the rolling mill product. A plurality of speed measuring devices that are positioned in close proximity to each rolling mill stand, where each speed measuring device measures the speed of the rolling mill product as it passes the speed measuring devices. A control device receives information associated with the speed measuring devices and adjusts the speed of the rolling mill product for any speed differential that might exist between any of the rolling mill stands.

A driving force transmission mechanism is capable of preventing breakage of an oil chamber when the internal pressure in the oil chamber rises by impact when replacing work rolls and the like. The driving force transmission mechanism transmits power of a driving source to a work roll through a spindle and includes a first gear portion disposed on one end portion of the spindle, a second gear part disposed on the driving source or the work roll and fitted to the first gear part and an oil chamber for supplying a lubricating oil to the first gear part and the second gear part, where the oil chamber is provided with a first valve for discharging inner air in the oil chamber to an outside of the oil chamber and a second valve for introducing outer air into the oil chamber.

A driving force transmission mechanism is capable of preventing breakage of an oil chamber when the internal pressure in the oil chamber rises by impact when replacing work rolls and the like. The driving force transmission mechanism transmits power of a driving source to a work roll through a spindle and includes a first gear portion disposed on one end portion of the spindle, a second gear part disposed on the driving source or the work roll and fitted to the first gear part and an oil chamber for supplying a lubricating oil to the first gear part and the second gear part, where the oil chamber is provided with a first valve for discharging inner air in the oil chamber to an outside of the oil chamber and a second valve for introducing outer air into the oil chamber.

A hand-powered jewellery rolling mill is disclosed. The mill comprises a support frame and a pair of opposed parallel cylindrical rollers rotatably mounted to the support frame. A drive shaft is connected to at least one of the rollers for rotation thereof. A manually rotatable handle is configured for providing a drive force to the drive shaft. The handle may be connected to the drive shaft through a high-ratio gear train. The rolling mill may further comprise an input shaft, rotatable by the manually rotatable handle. The input shaft may have a worm and a worm-to-gear coupling may transfer torque from the input shaft to the drive shaft.

A hand-powered jewellery rolling mill is disclosed. The mill comprises a support frame and a pair of opposed parallel cylindrical rollers rotatably mounted to the support frame. A drive shaft is connected to at least one of the rollers for rotation thereof. A manually rotatable handle is configured for providing a drive force to the drive shaft. The handle may be connected to the drive shaft through a high-ratio gear train. The rolling mill may further comprise an input shaft, rotatable by the manually rotatable handle. The input shaft may have a worm and a worm-to-gear coupling may transfer torque from the input shaft to the drive shaft.

The present disclosure relates to an asymmetric rolling device capable of enhancing a physical property of materials and may include: a first work roll contacting a first surface of a material to be rolled; a second work roll contacting a second surface of the material to be rolled and having a second radius greater than a first radius of the first work roll so as to asymmetrically roll the material to be rolled; a drive roll contacting the first work roll and formed above or below the first work roll so as to drive the first work roll; a driving device driving the second work roll or the drive roll; and a first idle roll contacting the first work roll and formed at a front or a back of the first work roll to support the first work roll in a longitudinal direction of the material.