JPH0133529Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a roller conveyor with a workpiece detector, which is equipped with means for detecting the passage of a workpiece made of a conductive material when it slides on the roller conveyor.

(Prior Art) A roller conveyor equipped with such a means for detecting a workpiece is disclosed in, for example, Japanese Utility Model Application No. 54-49089, a device for detecting passage of conveyed articles. This device is
At least one roller of the roller conveyor is provided with a so-called floating roller that protrudes slightly upward from the surface of the other workpieces, so that when the workpiece slides on the roller conveyor and comes into contact with the upper part of this floating roller, the floating roller The passage of the switch is detected by operating the switch using the displacement. Further, in Utility Model Application No. 51-140977, a load passage detection device is provided with a passage plate slightly protruding from the roller surface at at least one location of the roller conveyor, and the workpiece slides on the roller conveyor and hits this passage plate. When a workpiece comes into contact with the workpiece, the displacement of the passage plate is used to operate a switch to detect the passage of the workpiece. Others use phototube switches for detection.

(Problems that the invention aims to solve) With such conventional devices, there are problems such as inability to detect irregularities in the shape of the workpiece, and poor detection due to damage or dirt on the detection device, resulting in unreliability. Lacks sex.

Therefore, an object of the present invention is to provide a highly reliable roller conveyor with a workpiece detector that uses electrical means instead of physical means as in conventional devices.

(Means for Solving the Problem) In order to achieve this object, the present invention provides at least one roller of a group of rollers of a roller conveyor provided on a support frame, electrically insulated from the support frame, The electrically insulated roller and at least one of the other rollers or the support frame form a circuit that forms a closed circuit when a workpiece made of an electrically conductive material passes through the circuit. The structure is characterized in that a means for detecting the passage of the workpiece is provided.

(Function) With this configuration, a workpiece made of an electrically conductive material slides on the roller conveyor, and the workpiece contacts rollers or roller groups or roller groups, causing an electrical short circuit. Since a closed circuit is formed and the detection means is energized, passage of the workpiece can be detected reliably.

(Example) The present invention will be described in detail below based on drawings showing examples thereof. As shown in FIGS. 1 and 2, the roller conveyor with a workpiece detector is a roller conveyor 1 normally used for conveying objects, and includes support frames 2, 2 and rollers 4 on which the workpiece 3 slides. ，
5 and a detection means 6. The support frames 2, 2 are made of an electrically conductive material.
The rollers 4, 5 are made of electrically conductive material.

The roller 4 is a cylindrical body as shown in FIG.
It has open ends at both ends, and ball bearings 17, 17 are fitted into the both open ends, and further, the roller shaft 7 is fitted into the inner diameter of the ball bearings 17, 17, and the roller 4 covers the outer peripheral surface of the roller shaft 7. It is rotatably provided. Both ends of this roller shaft 7 are
It penetrates the side walls of the support frames 2, 2. Bushings 9, 9 made of an insulating material are fitted into the through holes 8, 8 from the inside of the support frames 2, 2.

Furthermore, a screw hole for connecting an electric wire is provided from one end of the roller shaft 7. Therefore, the roller 4 is electrically insulated from the support frames 2, 2.

The roller 5 is formed similarly to the roller 4 as shown in FIG.
penetrate through the through holes 8, 8 of the support frames 2, 2.

Furthermore, a screw hole for electrical connection is provided from one end of the roller shaft 11. In this case, the support frame 2,
Since roller 2 is made of a conductive material, roller 5
are electrically connected to the support frames 2, 2.

Furthermore, in consideration of safety measures, the detection means 6
For example, a 5VDC DC power supply 12 (hereinafter referred to as the power supply 12) is used, and the electric wire 14 is connected to the anode side 13.
is bolted to a screw hole provided at one end of the roller shaft 7 of the roller 4 via a terminal 15, as shown in FIG. On the other hand, a wire 14 is connected from the cathode side 16 of the power supply 12 to the relay 10 (for example, 5VDC, 100m
A) is connected to one terminal of the roller 5, and the electric wire 14 is connected to the roller 1 of the roller 5 from the other terminal as shown in FIG.
1 in the same way as the roller shaft 7. Further, although not shown in the drawings, a counter, an indicator light, or the like may be provided to indicate the passage of the workpiece 3 from a known control circuit formed by contacts belonging to the relay 10 or a photocoupler.

First, a description will be given based on FIG. 1 showing the first embodiment. An electric wire 14 wired from the anode side 13 of the power source 12 of the detection means 6 is connected to the roller shaft 7 of the insulated roller 4. There is. On the other hand, the electric wire 14 wired from the cathode side 16 via the relay 10 is connected to the roller shaft 11 of the 5 groups of three non-insulated rollers; The electric wire 14 is not connected to the shaft 11. However, since the support frames 2, 2 are made of an electrically conductive material, the roller shafts 11 of the 5 groups of rollers are electrically connected to the support frames 2, 2.
Therefore, the workpiece 3 slides on the roller conveyor 1,
When the workpiece 3 comes into contact with the roller 4 and one of the three rollers 5 located next to it, the circuit of the detection means 6 becomes short-circuited, forming a closed circuit. Therefore, the relay 10 indicates the ON state, and this signal indicates that the workpiece 3 has passed a predetermined position on the roller conveyor 1.

The detection means 6 is formed so that when the workpiece 3 passes and slides on the continuous group of rollers 5, the formed closed circuit becomes open. A feature of this embodiment is that passage of the workpiece 3 is reliably detected at the positions of the rollers 4 and 5 that form an electric circuit.

A description will be given based on FIG. 2 showing a second embodiment. Similar to the first embodiment, the electric wire 1 on the anode side 13
4 is connected to the roller shaft 7 of the roller 4, and the cathode side 1
The electric wire 14 wired through the relay 10 of No. 6 is connected to the support frame 2 through a terminal 15, as shown in FIG. Therefore, in this embodiment, the support frame 2,
2 is made of an electrically conductive material, and the roller shafts 11 of the roller 5 group are electrically connected to the support frames 2, 2. Therefore, when the workpiece 3 slides on the roller conveyor 1 and comes into contact with the roller 4 from the roller group 5, the circuit of the detection means 6 becomes short-circuited, forming a closed circuit. Therefore, the passage of the workpiece 3 is detected in the same manner as shown in the first embodiment. After detection, workpiece 3 moves over roller 5 groups onto roller conveyor 1.
The detecting means 6 is formed so that the closed circuit formed at that time is in an open state. A feature of this embodiment is that the electric wire 14 on the cathode side 16 only needs to be connected at one location.

Although the embodiments described above use a DC power source, a low voltage AC power source can also be used.

Next, its effect will be explained.

First, in the first embodiment, the cathode side 16 of the power supply 12 is
An electric wire 14 is connected to the roller shaft 11 of the roller 5, which is not insulated from the support frames 2, 2. This is connected to the roller shaft 11 in order to ensure that the workpiece 3 is detected at a specific position.

Therefore, when the workpiece 3 short-circuits the rollers 5 and 4 to which the electric wire is not connected, the relay 10 is activated.
Although there is a possibility that it will be in the ON state, when it comes into contact with the roller 5 to which the next electric wire is connected from the roller 4, it will definitely be detected.

In the second embodiment, an electric wire 14 from a cathode side 16 of a power source 12 is connected to a support frame 2. This allows the passage of the workpiece 3 to be detected when it slides on the roller conveyor 1 and any of the rollers 5 and 4 are short-circuited.

Due to the above-described operation, a closed circuit is formed through the workpiece 3 sliding on the roller conveyor 1, and since electricity is supplied, passage of the workpiece 3 can be detected reliably.

(Effects of the invention) As described above, the present invention can achieve reliable and reliable detection of the workpiece 3 sliding on the roller conveyor, which greatly improves work efficiency and speeds up the progress of the work. It is done smoothly.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a first embodiment of the present invention, Fig. 2 is a schematic diagram showing a second embodiment of the invention, and Fig. 3 shows a roller insulated from a support frame. FIG. 4 is a vertical cross-sectional view showing the roller not insulated from the support frame, and FIG. 5 is a vertical cross-sectional view showing the cathode side electric wire of the power source connected to the support frame. 1: Roller conveyor, 2: Support frame, 3: Workpiece, 6: Detection means.

Claims (1)

[Scope of utility model registration request] At least one roller of a roller group of a roller conveyor provided on a support frame is provided electrically insulated from the support frame, and at least one of the roller and another roller group is provided electrically insulated. With a workpiece detector, the circuit is formed with a roller or a support frame to form a closed circuit when a workpiece made of an electrically conductive material passes through the circuit, and a means for detecting the passage of the workpiece is provided in the circuit. roller conveyor.