Patent ID: 7380977

Claim:
A dental impression material kneading device for discharging each paste of a dental impression material including two kinds of pastes having different fluidities at the time of feed start, with a mixing ratio selected and set among two or more gradual mixing ratios, and for mixing and kneading the both pastes in a mixer body, the dental impression material kneading device comprising: a stirring rod configured to rotate about an axis of rotation; an outer case; first and second inlets where each paste is fed from first and second containers accommodating each paste, respectively; first and second outlets provided at a mixer body mounting part including the outer case mounting part through which the stirring rod configured to rotate about an axis of rotation projects, wherein said outer case mounting part is configured to detachably couple to said outer case; a prescribed rate feed pump configured to feed one paste from said first inlet to said first outlet at a fixed flow rate; a set rate feed pump configured to feed another paste from said second inlet to said second outlet at a flow rate gradually selected to be more than said flow rate of the prescribed rate feed pump; a mixing ratio selection switch configured to select and set an arbitrary mixing ratio of both pastes from among the two or more gradual mixing ratios; a starting time memory configured to store starting times of said prescribed rate feed pump and said set rate feed pump, where these times correspond to the two or more gradual mixing ratios of both pastes; and a control means configured to rotatively drive the stirring rod upon receiving a signal for starting the mixing and kneading of the both pastes from a starting switch configured to transmit the signal; collate the starting times stored in said starting time memory, where said starting times correspond to the mixing ratio selected and set by said mixing ratio selection switch, start said prescribed rate feed pump and said set rate feed pump according to the collated starting times, and control said set rate feed pump so as to feed the paste at a flow rate corresponding to the mixing ratio selected and set by said mixing ratio selection switch.