JPS626939B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves mounting a jig for holding a workpiece downward on the upper part of a machine frame set upright at a working position, and performing welding or other predetermined processing on the workpiece held by the jig. The present invention relates to a jig changing device in a welding device, etc., which performs the following steps.

Conventionally, in this type of welding equipment, a workpiece is carried into the lower space of the working position surrounded by a machine frame using a trolley, and the workpiece on the trolley is lifted and placed downward on the upper part of the machine frame. It is configured to be delivered to a tool and welded to it, but when changing the model of a workpiece, the jig is replaced by lifting the jig with a crane or the like and replacing the jig at the top of the machine frame. This is generally the case, and comes with the disadvantage of poor workability and safety.

In order to eliminate such inconveniences, the present invention aims to provide a jig changing device in which a plurality of jigs are prepared in advance on a machine frame and can be selectively operated. A machine frame installed upright at a working position, a rotating shaft horizontally installed on the machine frame, a supporting member protruding radially on the rotating shaft, and a supporting member attached to the supporting member via a base frame. A plurality of jigs having a plurality of clamp members on the base frame and the same number of index grooves as the jigs are provided on the outer periphery, and an index plate fixed to the rotating shaft and the index grooves of the index plate are connected to each other. and a stopper for suspending one of the jigs from the lower surface of the machine frame.

Next, the present invention will be explained with reference to the illustrated embodiments. In the drawing, 1 is the machine frame installed at the working position, 2 is the workpiece W
This jig 2 is a base frame 2a.
According to the present invention, a plurality of clamp members 2b for gripping the workpiece W are attached to the clamp member 2b.
A rotating shaft 3 is installed horizontally on the upper part of the machine frame 1, and a plurality of jigs 2 are supported around the rotating shaft 3 via respective supporting members 4. In addition, shaft supports 5, 5 on both the front and rear sides are protruded from the upper part of the machine frame 1, and the rotation shaft 3 is supported thereon.
Arm-shaped support members 4 extending radially outward are provided protrudingly at three locations in the circumferential direction at intervals in the front and rear, respectively,
The base plates 2a of each jig 2 were attached to these supporting members 4, and the jigs 2 were arranged around the rotation shaft 3 in a total of three units.

The rotating shaft 3 is rotated by an indexing device 6, and the device 6 moves a rack 8 on the machine frame 1, which engages a pinion 7 on the rotating shaft 3, forward and backward using a cylinder 9 to index the index. A rotational drive mechanism for rotating the rotating shaft 3, and a stopper on the machine frame 1 opposite to the index plate 10 having index grooves 10a at three locations around the rotating shaft 3 as shown in FIG. 11 and a positioning mechanism for positioning the rotary shaft 3 by freely engaging and disengaging each groove 10a by a cylinder 12, and the two mechanisms work together to appropriately rotate the rotary shaft 3 by a predetermined angle. , any one of the three jigs 2 can be selectively reversed to a lower operating position. Therefore, when changing the model of the workpiece W, the corresponding jig 2 can be reversed to the lower operating position to easily handle the model change.

In this way, according to the present invention, the rotating shaft 3 is installed horizontally on the machine frame 1 which is installed upright at the working position.
A support member 4 protruding radially is provided, a jig 2 is attached to the support member 4 via a base frame 2a, and has a plurality of clamp members 2b on the base frame 2a, and one of the jig 2 is attached to the support member 4 through a base frame 2a. An index plate 10 having the same number of index grooves 10a on the outer periphery and fixed to the rotating shaft 3, and a stopper 11 that engages with the index grooves 10a of the plate 10 are provided on the lower surface of the machine frame 1. Since the indexing device is made to hang down, it is possible to easily and quickly replace the jig when changing the model of the workpiece, and the indexing device is supported on the rotating shaft, making it easy and compact. has.

[Brief explanation of the drawing]

FIG. 1 is a side view of one example of the device of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a front view of the positioning mechanism portion of the indexing device. 1...Machine frame, 2...Jig, 3...Rotation axis, 4...
...Supporting member, 6...Index device.

Claims (1)

[Claims] 1. A machine frame installed upright at a working position, a rotating shaft installed horizontally on the machine frame, a support member protruding radially on the rotating shaft, and attached to the supporting member via a base frame. a plurality of jigs having a plurality of clamp members on a base frame; an index plate having the same number of index grooves as the jigs on the outer periphery and fixed to the rotating shaft; and an index plate of the index plate. A jig changing device comprising a stopper that engages with the groove and suspends one of the jigs onto the lower surface of the machine frame.