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Title:
STRETCH BENDING MACHINE
Document Type and Number:
Japanese Patent JP2008142718
Kind Code:
A
Abstract:

To provide a stretch bending machine which can improve the working efficiency of its adjusting work, and also can accurately detect the generating timing of abnormal pressure to be generated in a hydraulic cylinder.

The measuring portion 51 of an internal pressure sensor 50 is arranged inside a piston rod side pressure chamber 27. Further, a moved length detecting device 54 to be composed of a rotary encoder 55 is arranged to a piston rod 25 so as to measure the moved length from a preset reference position. In addition, rotary encoders 60 are arranged on lap arm portions 5 so as to measure turned angles from a preset reference angular position. In this configuration, when abnormal pressure is measured in the piston rod side pressure chamber 27 by means of the internal pressure sensor 50, the moved length of the piston rod 25 and the turned angles of the lap arm portions 5 at that time are informed by means of a monitor 65.


Inventors:
YOKOYAMA MORIMASA
Application Number:
JP2006329747A
Publication Date:
June 26, 2008
Filing Date:
December 06, 2006
Export Citation:
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Assignee:
TOKO SEISAKUSHO KK
International Classes:
B21D7/06; F15B20/00
Domestic Patent References:
JPH10192989A1998-07-28
JP2000237825A2000-09-05
JPH10216848A1998-08-18
JP2005282644A2005-10-13
Attorney, Agent or Firm:
Kitao Matsuura
Yasutoshi Iwata
Yu Yamamoto