Toshiba Kikai Kabushiki Kaisha

Toshiba Machine Co., Ltd.

Koichi Ozawa

Hiroshi Kanno

Koichi Kanazawa

Hajime Abe

Tsugio Toyama

Yutaka Owashi

In a hot runner exchange apparatus for use in a vertical type injection molding machine made up of a metal mode, a mold clamping device for opening and closing the metal mold in the vertical direction, an injection device having a nozzle provided at the front end of a heating cylinder and a hot runner acting as a passage of molten resin supplied to the metal mold, there are provided a hanger for hanging the hot runner, a device for vertically moving the hung hot runner and a driving device for moving the hung hot runner in the axial direction thereof.

Hot runner exchange apparatus for use in an injection molding machine

In a heating/cooling unit for selectively heating or cooling a set of dies, oil received in a reservoir is supplied to a flow direction changeover valve by a first oil pump. In a stably mode, oil is returned to the reservoir through the changeover valve and a heat exchanger. In a heating mode, the oil is supplied to a second oil pump from the changeover valve through a check valve. The second oil pump supplies the oil to an oil heater, and the heated oil is introduced into a fluid path formed in the dies to heat the dies. The oil discharged from the fluid path of the dies is returned to the second oil pump. Thus, the heated oil is circulated in a closed loop in the heating mode. In a cooling mode, new oil is supplied to the fluid path of the dies from the changeover valve and the oil discharged from the fluid path is guided to the heat exchanger through a switching valve and the cooling oil is returned to the reservoir.

Heating and cooling unit

An injection molding machine is provided with two sets of metal molds each including a stationary and movable metal molds. The two sets are mounted on a supporting plate which is moved in a direction perpendicular to the axis of an injection cylinder. Thus by reciprocating the supporting plate the two sets of the metal molds are alternately moved into and out of the injection molding machine.

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Susono, Japan

Koichi Ozawa