JPS6055408B2 - Automatic detection device for disturbance of long objects - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a system for automatically detecting disturbances in a long object such as an axial lead type electrical component being transported by a transport device. This invention relates to an automatic disturbance detection device.

As shown in Fig. 1, generally when transporting electrical parts 1 (hereinafter referred to as "works") such as axial lead type dies and auto parts, the works 1 are placed one by one on a conveyor chain 2, which is a transport device, and It is widely used to convey workpieces at intervals of one pitch (corresponding to 1 in FIG. 1) of the chain 2. A combination of a ball feeder and a lightning shooter is used to place the workpiece 1 on the conveyor chain 2, but due to external factors such as bending of the lead wire of the workpiece 1, the workpiece 1 is placed on the conveyor chain 2. It may not be possible to ride in the designated position.

In FIG. 1, a workpiece 1a is placed in a predetermined groove a-a' on a conveyor chain 2. For example, a workpiece lb
, the workpiece is disordered like a pine needle like lc, the workpiece ld,
Two workpieces are placed in one groove d-d' as in le, or two workpieces are placed in a predetermined groove distance e-e' or f as in work lf.
-f' may cause the workpiece to be disturbed, such as being placed not in one position but in the adjacent groove fe'. If such a disturbance occurs in the workpieces, the workpieces will become disturbed one after another on the conveyor chain 2 when measuring the electrical characteristics of the workpieces, and may also cause erroneous measurements.

Furthermore, when marking workpieces, unmarked products may be left unmarked. Therefore, with conventional equipment, in order to prevent the occurrence of defective products and perform work with high precision, operators must constantly monitor each piece of equipment, making it difficult to improve work efficiency. It was hot. Not only when a workpiece is transported on a conveyor chain, but also when a long object is transported on a conveyance means that replaces a conveyor chain, such as a belt conveyor, table roller, etc. A problem has arisen in that workers must constantly monitor the equipment to make sure that it is placed in the correct position. The present invention eliminates the above-mentioned drawbacks, and provides an automatic long object disturbance detection device that automatically detects long objects that are not placed in a predetermined position on a conveying device and improves work efficiency. be.

The automatic long object disturbance detection device of the present invention that achieves the above object is characterized by measuring the number of long objects passing at a predetermined interval at at least two locations in the longitudinal direction of the long object;
A rejection signal is emitted when the number of long objects passing at a predetermined interval exceeds a predetermined number, and when the number of long objects passing at a predetermined interval measured at at least two locations does not match. That's the point.

Here, the predetermined interval is, for example, l in FIG.
At the 1st pitch of conveyor chain 2 shown in the figure! The interval is corresponding.

FIG. 2 shows a block diagram of an automatic disturbance detection device for a long object, which is an embodiment of the present invention.

In FIG. 2, 6a and 6b are detection circuits, and the light receivers 4a and 4 detect the presence or absence of a long workpiece, respectively.
The counters 5a and 5b receive output signals from the light emitters 3a and 3b and the light receivers 4a and 4b, respectively, and calculate the number of passing works at a predetermined interval.

The counters 5a and 5b are synchronized with the conveyance speed 4 of the conveyor chain 2, which is a conveyance device, and are reset each time the conveyor chain 2 moves by one pitch, which is a predetermined interval. 7 receives electric pulse signals which are the output signals of the detection circuits 6a and 6b, and checks the number of workpieces passing within a predetermined interval, and if there is even one workpiece that exceeds the predetermined number. is a first determination circuit that issues a rejection signal.

For example, if the predetermined number is one, the detection circuits 6a, 6
When b is "0" and "1", the detection circuits 6a and 6b
The signals from the detection circuits 6a and 6 are output as they are, but the detection circuits 6a and 6
If at least one of b is ゜"2゛ or more, a fail signal is output. 8 is a first judgment circuit 7 that outputs a pass signal in the form of an electric pulse signal through a comparison circuit 8a. When the output signals of the detection circuits 6a and 6b do not match, a fail signal is issued, and when they match, a pass signal is issued.
This is a second determination circuit that detects a discrepancy in the number of passing workpieces at a predetermined interval measured by the detection circuits 6a and 6b, and detects a disturbance in the workpieces.

The failure signals of the first and second judgment circuits 7 and 8 are output from terminals a-c.
The information is then transmitted to an alarm device (not shown) and used to issue an alarm. Further, the pass signal is transmitted from the terminal d to a display device (not shown), and is used to indicate that the workpiece is being smoothly conveyed on the conveyor chain.
A plan view illustrating the mounting positions of a light emitter and a light receiver used in an embodiment of the present invention is shown in FIG. 3a, and a front view is shown in FIG. 3b.

Figure 3 A. , b, similarly to FIG. 1, a predetermined number of long workpieces 1, for example, one piece at a time, are placed on the conveyor chain 2, and the workpieces 1 are placed at intervals of one pitch of the conveyor chain 2. Convey in the direction shown by the arrow.

As shown in FIGS. 3a and 3b, light emitters 3a and 3b are provided separately along the conveyor chain 2 in the longitudinal direction of the workpiece, and the light emitters 3a and 3b are placed symmetrically to the conveyor chain 2. Light receivers 4a and 4b are provided to receive the light emitted by lights 3a and 3b, respectively. Light emitter 3a,
3b and the light receivers 4a, 4b are provided to sandwich the workpiece 1 from above and below, so in FIGS.
When passing between the light emitter 3b and the light receivers 4a and 4b, the light emitter 3
The light from a and 3b is blocked by the workpiece 1a, and the light does not reach the receivers 4a and 4b, indicating that the workpiece 1a is present, and then the state shown in Fig. 3a and b occurs. , the light from the emitters 3a and 3b is transmitted to the receiver 4.
It can be seen that there is no workpiece 1a after reaching a and 4b.

Now, workpiece 1 is in the state shown in Figures 1 and 3 A and b.
It is assumed that a to 1f are transported.

At this time, the predetermined number of workpieces is one, and in the first judgment circuit 7, if the output signal of the detection circuit 6 is "2" or more, the work is rejected. , each workpiece 1a to 1 transported in the direction of the arrow by the conveyor chain 2
This shows the state immediately before f passes between the light emitters 3a, 3b and the light receivers 4a, 4b and the counter is reset. In the case shown in Fig. 4a, when the workpiece 1a passes between the light emitters 3a, 3b and the light receivers 4a, 4b, the output signals of the detection circuits 6a, 6b become "1", "゜1", and the first It passes through the determination circuit 7, and is determined to be a pass by the comparison circuit 8a of the second determination circuit 8 due to the combination (1, 1), indicating that the workpiece 1a is placed at a predetermined position.

After the workpiece 1a has passed, the counters 5a and 5b are reset and detect the next workpiece. Similarly, when there is no workpiece on the conveyor chain as shown in FIG. Passed the test.

As shown in Fig. 4c, when the workpieces 1b and 1c are disturbed like pine needles, the output signals of the detection circuits 6a and 6b are respectively ゜2.
゛, ``゜1゛'', and in the first judgment circuit 7, since there is a signal of ``゜2゛ or more, it is rejected, and a fail signal is output. When the workpieces 1d and 1e overlap as shown in FIG. 4d, the output signals of the detection circuits 6a and 6b are respectively ゜゜2.
゛, ゜゜2゛, and the first determination circuit 7 rejects the test, outputting a rejection signal.

At this time, even if there are three or more overlapping works, the work will be rejected in the same way. In the case of the state shown in FIG. The combination of (0, 1) is determined by the circuit 8a to be a failure, and a failure signal is output.

Therefore, any disturbance of the workpieces on the conveyor chain 2 is automatically detected.

If the product is determined to be rejected and a rejection signal is output, possible measures may be taken such as stopping the conveyor chain 2 or issuing a rejection warning.

In this example, an axial lead type diode was explained as an example, but the diode is not limited to this, and square timbers,
The present invention can also be applied to general long objects such as steel materials,
Further, the predetermined number of elongated objects placed within a predetermined interval is limited to one, but may be plural.

In addition, the device for detecting long objects is not limited to the combination of a light emitter and a light receiver, but any device such as a photoelectric switch, proximity switch, limit switch, etc. that can detect the presence or absence of a long object can be used. Also good.

In this embodiment, a combination of a light emitter and a light receiver was installed at a position where the presence or absence of a workpiece could be determined at the same time.
It may be provided at any position within the range provided that there is nothing else on a straight line parallel to the traveling direction of the workpiece.

In addition, the number of combinations of light emitters and light receivers used to determine the presence or absence of a long object is limited to two. It's okay to be hot.

As the number of devices that determine the presence or absence of long objects increases, the number of counters increases and the first and second determination circuits described above become more complex, but the accuracy of the function to detect disturbances of long objects increases. Go up. At this time as well, a plurality of light emitters and light receivers may be provided at any position within the range of one pitch l of the conveyor chain 2, as shown in FIG. Since the device 4d, the light emitter 3e, and the light receiver 4e are on the same straight line in the traveling direction of the workpiece, the discrimination of long objects is the same for both of them, so it is sufficient to provide one of them. Furthermore, as shown in FIG. 5d, even if the orientation of the predetermined position where the work is placed is not perpendicular to the longitudinal direction and the transport direction of the work shown by the arrow, the conveyor chain 2 shown by the broken line in the figure As long as it is within the range of 1 pitch 1 of
, 8 use conventional electric pulse signal counters and determination circuits, so the detailed circuit configuration will be omitted.

Further, in this embodiment, a conveyor chain is used as an example of the conveyance device, but other general conveyance devices such as a belt conveyor or table roller may be used.

As described above, the present invention automatically detects long objects that are not placed in a predetermined position and in a predetermined number on a conveying device, which can greatly improve work efficiency. It is possible to obtain a device for automatically detecting disturbances in the length.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conveyance device for conveying a workpiece used in an embodiment of the present invention, FIG. 2 is a block diagram of an automatic detection device for disturbance of a long object, which is an embodiment of the present invention, and FIG. 3 a and b are a plan view and a front view of a part of an automatic long object disturbance detection device which is an embodiment of the present invention; FIG. 4 is an explanatory diagram for explaining the basic principle of the present invention; FIG. FIG. 3 is an explanatory diagram for explaining another embodiment of the present invention. 1a-f...work, 6a, 6b...
Detection circuit, 7...First judgment circuit, 8...
...Second judgment circuit.

Claims (1)

[Claims] 1. Long objects are placed at a distance in the longitudinal direction along a conveying device that transports long objects such that the longitudinal direction thereof has a predetermined angle with respect to the transport direction and a predetermined number of long objects are placed at a predetermined interval with respect to the transport direction. a plurality of detection means for detecting the number of long objects passing at the predetermined interval and outputting the number of passing objects as electric pulses; a first determining means for emitting a rejection signal when the number of long objects passed in the process exceeds the predetermined number, and a pass signal when the number is less than the predetermined number as an electric pulse signal; a second determining means that compares the pass signals from the detection means and issues a fail signal when the number of long objects detected by each detecting means that passes through the predetermined interval does not match, and issues a pass signal when they match; An automatic detection device for detecting disturbance of a long object, comprising: