United States Patent [19]
Takei et al.
[li] Patent Number: 4,833,616 [45] Date of Patent: May 23, 1989
[54] DEVICE FOR CONTROLLING OPERATION OF INJECTION MOLDER
[75] Inventors: Kazuo Takei, Hachioji; Susumu Toda, Yokohama; Yutaka Nakaya, Yokohama; Akimitsu Mita, Yokohama, all of Japan
[73] Assignees: Nifco Kasei Inc., Tokyo; Nifco Inc., Yokohama, both of Japan
[21] Appl. No.: 927,381
[22] Filed: Nov. 6, 1986
[30] Foreign Application Priority Data
Nov. 6, 1985 [JP] Japan 60-249446
[51] Int. CI.* G06F 9/00
[52] U.S. Q 364/473; 364/921.4
[58] Field of Search 364/200, 900, 473, 476
[56] References Cited
U.S. PATENT DOCUMENTS
4,326,255 4/1982 Fujita 364/476
4,338,115 7/1982 Farkas 364/476
4,344,142 8/1982 Diehr, II et al 364/473
4,369,052 1/1983 Hotmer 364/476
4,427,431 1/1984 Mumford et al 364/476
4,695,237 9/1987 Inaba 364/473
Primary Examiner—Gareth D. Shaw
Assistant Examiner—John G. Mills
Attorney, Agent, or Firm—Obion, Fisher, Spivak,
McClelland & Maier
[57] ABSTRACT
A device for controlling the operation of an injection molder is disclosed. A fall detection signal is produced when a product falls from the mold. If the full detection signal is generated before the lapse of a fixed time preset in a timer from the instant of appearance of a moldopening signal from a mold-opening signal generator, the next molding cycle is started. If no fall detection signal is generated within the preset time of the timer, an alarm is generated.
3 Claims, 4 Drawing Sheets
