Title:
INSPECTION DEVICE FOR HEATER FOR DIE
Document Type and Number:
Japanese Patent JP3231056
Kind Code:
B2
Abstract:
PURPOSE: To detect a short circuit between a heater for heating the hot-runner block of an injection molding die and the die.
CONSTITUTION: Cartridge heaters CH1-CH4 and band heaters BH1-BH3 are installed to each section of a hot-runner block 06. When short-circuit inspection currents at low voltage are made to flow collectively through all heaters and the generation of a short circuit is detected by short circuit currents leaking from the heaters to the die side, an alarm is given by a buzzer. The heater, in which the short circuit is generated, is specified by separately making short- circuit inspection currents flow through each heater. When temperature-rise voltage is applied to said heater in order to elevate the temperature of the heater, a breaker is turned OFF and the temperature rise of the heater is stopped when there is the position of the short circuit, thus protecting an operator and facilities.
Inventors:
Shuichi Matsumoto
Application Number:
JP28805791A
Publication Date:
November 19, 2001
Filing Date:
November 01, 1991
Export Citation:
Assignee:
Honda motor industry stock company
International Classes:
B29C33/02; B29C45/26; B29C45/27; B29C45/73; B29C45/84; G01R31/02; (IPC1-7): B29C45/73; B29C33/02; B29C45/26; B29C45/84; G01R31/02
Domestic Patent References:
| JP238611U |
Attorney, Agent or Firm:
Ken Ochiai (1 person outside)