Lift regulator for lower wheel of printer jointed with base

The utility model provides a lifting and adjusting device for a lower wheel of a seated imprinter. The imprinter has two side walls and a letterpress and two shaft blocks are arranged between the two side walls up and down. A lower wheel is arranged between the two shaft blocks by a pivot. In order to adapt to the replacement of the letterpress of various outside diameters, one end of the shaft blocks drives the displacement with two lifting sliding blocks via a transmission mechanism and the other end lifts with a stay bar which has a spiro union with the shaft blocks via rotation and regulation. The adjustment of the two steps can realize the lifting of the relative letterpress of the lower wheel. The processing of the two side walls is simplified to reduce the cost of the imprinter.