Electric press, bend-point detection method, and program

Patent metadata

Field	Value
Publication number	US-10173385-B2
Application number	US-201414473681-A
Country	US
Kind code	B2
Filing date	Aug 29, 2014
Priority date	Sep 9, 2013
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A detection unit for detecting a data row of a press position and a load at the press position; an input/storage unit for inputting and storing a value serving as a reference for determining a bend point in a relation between the press position and the load at the press position; a data-row calculation unit for calculating a data row of a press position and a load at a constant distance interval based on the data row of the press position and the load detected; a slope calculation unit for calculating a slope of the load based on the press position and the load at the press position detected; and a bend-point determination unit for determining a point, at which the calculated slope of the load exceeds the value serving as the reference for determining the bend point, as the bend point are provided.

First claim

The invention claimed is:

1. An electric press comprising:
a detection unit configured to detect a first data row of a press position at a constant time interval and a load at the press position at the constant time interval;
an input and storage unit configured to input and store a value serving as a reference for determining a bend point in a relation between the press position and the load at the press position;
a data-row calculation unit configured to calculate a second data row of a press position and a load at a constant distance interval based on the first data row of the press position and the load detected;
a slope calculation unit configured to calculate a slope of the load based on the second data row of the press position and the load at the press position at the constant distance interval, according to a regression line, wherein the slope of the load is calculated by the following formula (i),

the
⁢

⁢
slope
⁢

⁢
of
⁢

⁢
the
⁢

⁢
load

=

n
⁢

∑

i
=
1

n

⁢

x
i

⁢

y
i

-

∑

i
=
1

n

⁢

x
i

⁢

∑

i
=
1

n

⁢

y
i

n
⁢

∑

i
=
1

n

⁢

x
i
2

-

(

∑

i
=
1

n

⁢

x
i

)

2

,

[

Formula
⁢

⁢

(
i
)

]

and wherein, in the formula (i), n denotes a number of data, xi denotes data of a pressurization part, and yi denotes data of the load; and
a bend-point determination unit configured to determine a point, at which, the calculated slope of the load exceeds the value serving as the reference for determining the bend point, as the bend point.

2. An electric press comprising:
a detection unit configured to detect a first data row of a press position at a constant time interval and a load at the press position at the constant time interval;
an input and storage unit configured to input and store a value serving as a reference for determining a bend point in a relation between the press position and the load at the press position;
a data-row calculation unit configured to calculate a second data row of a press position and a load at a constant distance interval in space of the press position and the load based on the first data row of the press position and the load detected;
a slope calculation unit configured to calculate a slope of the load based on the second data row of the press position and the load at the press position at the constant distance interval in the space of the press position, according to a regression line, wherein the slope of the load is calculated by the following formula (i),

the
⁢

⁢
slope

Assignees

• Janome Sewing Machine Co Ltd

Inventors

• Takada Shingo
• Hiruma Kenichiro

Classifications

• B21D5/006

  combined with measuring of bends · CPC title

• B21D5/004

  with program control · CPC title

• B30B15/0094

  Press load monitoring means (B30B15/281 takes precedence) · CPC title

• B21D5/02

  on press brakes without making use of clamping means · CPC title

• B30B15/26 Primary

  Program-control arrangements · CPC title