Abstract: An object of the present invention is to provide a dioxazine pigment having excellent fluidity. More specifically, an object of the present invention is to provide a dioxazine pigment in which practically sufficient fluidity is attained in both (1) initial viscosity and (2) storage stability when the dioxazine pigment is used in a printing ink application. The object is attained by providing a dioxazine pigment having a contact angle with respect to water according to an infiltration rate method in a range of 30° to 75°, and a contact angle with respect to 1-bromonaphthalene according to an infiltration rate method in a range of 30° to 75°.

Abstract: Heat-up characteristics are obtained individually for a plurality of heat zones of an injection molding machine. A heat-up time is obtained from the heat-up characteristic of each heat zone and the difference between a preset temperature and an actual temperature. A heat zone that requires the longest heat-up time is specified. Heat-up of each heat zone is controlled in accordance with the longest heat-up time.

Abstract: Heat-up characteristics are obtained individually for a plurality of heat zones of an injection molding machine. A heat-up time is obtained from the heat-up characteristic of each heat zone and the difference between a preset temperature and an actual temperature. A heat zone that requires the longest heat-up time is specified. Heat-up of each heat zone is controlled in accordance with the longest heat-up time.

Abstract: Disclosed herewith is an injection control apparatus which is used for an injection-molding machine that is subjected to injection and hold pressure controls by means of a numerical control unit (30), and which controls the switching from the injection control to the hold pressure control based on the injection time and resin pressure so as to improve the operation reliability of the injection-molding machine and ensures production of good-quality molded articles.When the pressure on the resin filled in a mold that is detected by pressure detection means (26) exceeds preset pressure or when a predetermined time elapses after the start of the injection operation, hold pressure control means (30, 50, 60) starts the hold pressure control. When pulse distribution to a hold end position is not completed upon completion of the hold pressure control, an error register (51) of a servo circuit (50) is followed up by follow-up means (30) so that the pulse distribution is forcibly executed.

Abstract: A method and an apparatus for injection control for an injection-molding machine, adapted to perform injection control by means of a servomotor controlled by a numerical control unit, in which the injection control is completed by performing pulse distribution to the servomotor, up to a hold pressure end position, and a follow-up operation when injection-speed control and hold pressure control for individually predetermined times are finished, in order that the injection-speed control and the hold pressure control can be executed in a time-based manner.

Abstract: Disclosed is a manual operation system for a machine controlled by a numerical control apparatus (1). The same operation pattern as in an automatic operation mode can be manually performed according to the manual operation system.When a programmable controller central processing unit (6) determines that a manual instruction from selection switches (33a-33g, 34a, 34b) is kept enabled, the machine is controlled according to the manual operation program including a predetermined portion of the automatic operation program, thereby executing the same operation as in the automatic mode from the current position.

Abstract: Disclosed is a switching control system for a unit torque limit value of an injection molding machine servo motor (M) to limit a torque instruction (e) supplied from a servo circuit (8) to the servo motor (M) so as to optimize an injection pressure, a holding pressure, and a back pressure.During metering as compared with injection, an output level of a D/A converter (9) for receiving the torque limit instruction (g) is set to be smaller by a predetermined value to reduce the unit torque limit level. A unit torque limit value of the back pressure during metering is set to be smaller than the unit torque limit value for injection and holding pressures during injection, thereby setting smaller torque limit values during metering in units of smaller values as compared with the case of injection.

Abstract: A metering system of an injection molding machine which uses a numerical control unit (10), having a torque limit function, in order to control a rotating speed and a back pressure of a screw (1) in accordance with a screw position.The numerical control unit (10) reads out, from a non-volatile memory (14), a screw rotating speed command value and a torque limit value in accordance with a screw position detected by an encoder (P1), and outputs the readout screw rotating speed command value and torque limit value to a second servo motor (M2), which rotates the screw (1), and to a first servo motor (M1), which drives the screw (1) in the axial direction, respectively.

Abstract: An injection molding machine uses a servo motor (M) as a drive source of a mold clamp mechanism (2) and includes a mold protecting function. An NC control unit (4) for driving the servo motor (M) has a torque limit function, and performs torque limit when a mold is discriminated to have reached a preset mold protection start position, based on a detection output from a position detector (P). The NC control unit (4) further has a display unit (10). When a predetermined period of time elapses before the mold reaches a preset mold contact position, beginning from a point in time at which the mold reaches the preset mold protection start position, an alarm display is generated by the display unit (10).