Abstract: An injection device in a molding machine includes: a cylinder having an outlet member formed at a tip-end injection side, a stopper part provided at a rear side, and a pellet supply opening for supplying plastic pellets; a melting device having a plurality of melting holes formed communicating from inflow-side large openings to outflow-side small openings in the longitudinal direction of a device main body, the melting device having a diameter equal to an inner diameter of the cylinder; a heating unit for heating the melting device; and a drive unit for causing the melting device to move in a reciprocating manner.

Abstract: A first protrusion member 12 is provided on two side surfaces of a fixed mold 1 having a first parting surface 11. Moreover, a second protrusion member 22 is provided on side surfaces of a moving mold 2 including a second parting surface 21 having the same shape and size as the first parting surface 11, that is, two side surfaces placed in positions which are not opposed to the first protrusion member 12 when the fixed mold 1 and the moving mold 2 are closed. Consequently, the fixed mold 1 and the moving mold 2 are positioned by fitting the first protrusion member 12 into the side surface of the moving mold 2 and fitting the second protrusion member 22 into the side surface of the fixed mold 1. Consequently, it is not necessary to provide a guide pin in order to carry out the positioning and a size of a device can be reduced correspondingly.

Abstract: A first fitting surface 11 and a first mating surface 12 taking a concave shape are formed on a fixed mold 1, a second fitting surface 21 to be fitted to the first fitting surface 11 in clamping and a second mating surface 22 taking a convex shape which is to be mated in the first mating surface 12 in the clamping are formed in a moving mold 2, and a concave portion is provided on a bottom surface of the first mating surface 12 to form a cavity 3. Consequently, the fixed mold 1 and the moving mold 2 are positioned by fitting the first fitting surface 11 and the second fitting surface 21 and mating the first mating surface 12 and the second mating surface 22. Consequently, it is not necessary to provide a guide pin in order to carry out the positioning and a size of a device can be reduced correspondingly. Moreover, it is possible to decrease heat capacities of the fixed mold 1 and the moving mold 2 by the reduction in the size, thereby decreasing consumed power required for a temperature control.