JPH0448947Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a conveying device for a workpiece having small holes, such as the roof of an automobile.

(Prior Art) In automobile assembly lines, conveying devices are used to convey various types of roofs from pallets to the line. For example, phototubes are used to detect roofs with sunroofs and roofs without sunroofs. Improvements are being made. By the way, some of these roofs have a small hole for an antenna, while others do not, and conventionally, the presence or absence of this small hole for an antenna has been detected using a detection rod made of resin. However, this small hole has a width of about 20 mm and a length of about 45 mm, and the workpieces within the pallet are misaligned by about ±10 mm in the front, back, left, and right directions, and the stopping position of the conveyor itself is about ±5 mm. Due to this error, the detection rod could not fit into the small hole for the antenna, resulting in detection errors. Moreover, such conventional devices are not only expensive, but also have the risk of damaging the roof with the tip of the resin rod.

(Problems to be solved by the invention) This invention solves the conventional problems as described above, and can reliably fill small holes even if the workpiece in the pallet is misaligned or the stop position of the conveyor itself is misaligned. It was completed with the aim of creating a workpiece conveyance device that can detect and convey the target workpiece onto the line, and has small holes that do not cause any damage to the workpiece.

(Means for Solving the Problems) The present invention, which was made to solve the above problems, has a suction pad in contact with the top surface of the small hole of the workpiece that can be moved up and down on the bottom surface of the transport frame equipped with the workpiece holder. The suction pad is equipped with a pressure switch that is operated by the internal pressure of the suction pad.

(Example) Next, the present invention will be explained in detail by referring to the illustrated example.

In FIG. 1, 1 is a transport frame;
The entire structure is supported by an overhead traveling device (not shown) so that it can be raised and lowered, and can be moved between the position where the pallets are placed and the assembly line. A plurality of workpiece holders 2 are provided on the lower surface of this transport frame 1 . In this embodiment, the workpiece holder 2 is a suction head provided at the lower end of a rod 3 that can be raised and lowered, and is capable of suctioning the four corners of the workpiece 20 and lifting it. However, it goes without saying that any other type of holder, such as a hook or a top, can be used as the work holder 2. In addition, in order to prevent the workpiece 20 from falling in case of an emergency, the transport frame 1
Hooks 5 are provided on both sides of the cylinder 4 and can be swung between a solid line position and a broken line position by means of a cylinder 4.

In the present invention, in addition to the work holder 2 described above, a suction pad 6 is provided above the small hole 21 of the work 20 as a means for detecting the small hole 21 of the work 20. As shown enlarged in FIGS. 2 and 3, the suction pad 6 is attached to the lower end of the shaft 8 of the slide boss 7, and is always at the lowest position due to its own weight.
When the suction pad 6 hits the workpiece 20, it can also move upward. Further, this suction pad 6 can swing in any direction by means of two horizontal pins 9 and 10 arranged at right angles. 11 is a pressure switch attached to the upper part of this suction pad 6. This pressure switch 11 detects the internal pressure of the suction pad 6 and turns on and off depending on the magnitude of the internal pressure. In the embodiment, the diameter of the suction pad 6 is approximately 70 mm.

(Function) In this structure, the transport frame 1 is moved by an overhead traveling device (not shown) onto a pallet on which a workpiece 20 such as an automobile roof is placed, and then the transport frame 1 is Lower frame 1. At the same time, the workpiece holder 2 comes into contact with the upper surface of the workpiece 20 and attracts the workpiece 20.
At the same time, the suction pad 6 also comes into contact with the upper surface of the antenna small hole 21. The pressure inside the suction pad 6 is then reduced, but a small hole 2 is formed in the workpiece 20 as shown in FIG.
1 exists, even if the inside of the suction pad 6 is suctioned, air will flow in from the small hole 21, so the internal pressure of the suction pad 6 will not decrease, and therefore the pressure switch 1 will not decrease.
1 does not work. On the other hand, if the small hole 21 does not exist in the workpiece 20, the internal pressure of the suction pad 6 will drop sufficiently, and the pressure switch 11 will detect this and operate. Therefore, the presence or absence of the small hole 21 can be determined by the on/off state of the pressure switch 11. Moreover, even if the position of the workpiece within the pallet or the stop position of the conveyance device itself is shifted, and the position of the suction pad 6 with respect to the small hole 21 is slightly shifted, a part of the small hole 21 may be displaced from the opening of the suction pad 6. If there is a small hole 21, the internal pressure of the suction pad 6 will not decrease, so the presence or absence of the small hole 21 can be reliably known. In this way, while checking the workpiece with the small hole 21 and the workpiece without the small hole 21, the workpiece 2
can be transported onto the assembly line.

(Effects of the invention) As explained above, the present invention can reliably detect the presence or absence of a small hole in a workpiece even if there is a slight positional shift, and can transport the target workpiece. It also has the advantage that there is no risk of damaging the workpiece, and it can be manufactured at a relatively low cost. Therefore, the present invention has extremely great practical value as a conveyance device for a workpiece having a small hole, which eliminates the problems of the conventional method.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a front view of the main parts, Fig. 3 is a side view thereof, and Fig. 4 is an enlarged plan view showing the relationship between the workpiece and the suction pad. . 1...Transportation frame, 2...Work holder,
6...Adsorption pad, 11...Pressure switch, 20
...Work, 21...Small hole.

Claims (1)

[Scope of utility model registration request] A suction pad 6 that contacts the upper surface of the small hole 21 of the workpiece 20 is attached to the lower surface of the transport frame 1 equipped with the workpiece holder 2 so as to be movable up and down. A workpiece conveyance device having a small hole.