Japanese Patent Application No. 2019-085139, filed on Apr. 26, 2019, is hereby incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

The present invention relates to a press machine and a method of setting an operation for a press machine.

For example, a configuration in which an encoder is attached to a crankshaft has been well known as a method of detecting the position of a slide (a crank angle) in a press machine. There is also a well-known timing switch for a press machine which outputs a timing signal for activating (turning on) or deactivating (turning off) an attachment device (including equipment or an attachment device mounted on the press body and an external peripheral device) using outputs from the encoder. For example, JP-A-9-225696 discloses a timing switch using outputs from an encoder. According to the disclosure of JP-A-2004-58152, a timing switch for the start and end of operation is displayed in a table form at an interface and numerical values are input to the table as a method of setting a timing switch related to activation or deactivation operation of an attachment device.

In setting an operation for such an attachment device, the operator may find it difficult to intuitively imagine the positional relation between slide motion and the operation of the attachment device, which is defined as the slide position for each stroke (time or a crank angle). In particular, a skilled operator may imagine the slide motion as the rotational motion of an eccentric mechanism which drives the slide and set the operation for the attachment device according to its rotational angle. An input result by the conventional table type interface is dependent on the operator's imagination, which may result in different settings from those intended by the operator. Therefore, a higher level of skill is required in setting an operation for a servo press machine which allows slide motion to be arbitrarily changed.

SUMMARY

The present disclosure can provide a press machine which allows an operator to set an operation for an attachment device while visually recognizing the relation between the motion of a slide and the operation of an attachment device after setting and a method of setting an operation for a press machine.

According to a first aspect of the invention, there is provided a press machine performing press working by transforming a rotation of an electric motor into a reciprocating linear motion of a slide by using an eccentric mechanism which transforms a rotational motion into a linear motion, the press machine including:

a display unit which displays a first image in a circular shape corresponding to a rotation of the eccentric mechanism and representing one stroke of slide operation and a second image in a circular-arc shape corresponding to an operation of an attachment device interlocked with the press machine; and

an operation unit which receives an input operation,

the first image indicating at least one slide operation region,

the second image being placed concentrically with the first image in relation to the slide operation region, and

the second image having opposed ends each allowed to move in response to the input operation in a direction in which the second image extends.

According to a second aspect of the invention, there is provided a method of setting an operation for a press machine which performs press working by transforming a rotation of an electric motor into a reciprocating linear motion of a slide by using an eccentric mechanism which transforms a rotational motion into a linear motion, the method including:

displaying a first image in a circular shape corresponding to a rotation of the eccentric mechanism displayed at a display unit and representing one stroke of slide operation and a second image in a circular-arc shape placed concentrically with the first image; and

setting a range in which an attachment device interlocked with the press machine operates by performing an input operation to the second image.

