JPH0143890B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention detects whether the indicated value of a weighing scale such as a health meter, cooking scale, etc. is within the range of allowable error (tolerance) after the spring has been adjusted after assembly. It relates to an inspection device for inspection.

Weight scales such as health meters or cooking scales are required to accurately measure a wide range of weights. Therefore, at the testing stage, it is necessary to test whether the indicated values for two or more different weights are within the allowable range. In the case of a health meter, this test usually involves one piece being, for example,
By loading several 20Kg standard weights onto the health meter one after another, the loaded weight is increased step by step, and it is determined whether the deviation of the indicator scale at each stage is within the allowable range. It is done by twisting.

Currently, such inspections are carried out by full-time workers who read the indicated scale through a television camera, etc., and judge whether or not it is within the allowable range to make a pass/fail judgment, which is very time-consuming and requires a lot of work. This method has disadvantages such as low efficiency and high inspection costs due to the need for dedicated inspection workers.

Therefore, the present invention provides a useful testing device that can automatically test weighing scales to be tested, such as health meters and cooking scales.

Thus, the present invention includes a means 4 for transporting a weighing scale 2 to be tested, such as a health meter or a cooking scale, to a testing position B, and a means 5 for transporting the weighing scale 2 for testing from the testing position B. , two or more reference weights 6... are hung independently above the inspection position B, and the reference weights 6... are lowered one by one onto the weighing scale 2 to be inspected to gradually adjust the carrying load of the weighing scale. a sensor 19 that detects the amount of deflection of the indicator scale 20 of the weighing scale 2 to be inspected each time the reference weight 6 is loaded; A control circuit 22 that compares whether the amount of runout is within a predetermined tolerance range and issues a determination signal indicating that it is good if it is within the range and defective if it is not within the range;
Based on the good signal from the discrimination circuit 22, the weight lowering means 11 is driven downward, and the weighing scale 2 to be inspected is further lowered by one weight.
Additional reference weights 6 are loaded, and the weight lowering means 11 is driven upward by a good signal after all the reference weights 6 have been loaded, and all the weights 6... are removed from the weighing scale 2 to be inspected. A control circuit 23 that controls a series of operations such as raising the weighing scale 2 to be inspected and then operating the carrying-out means 5 to carry out the weighing scale 2 to be inspected from the inspection position B.
The gist is an inspection device for a weighing scale to be inspected, which is equipped with the following.

An embodiment of the present invention will be described below based on the drawings. FIG. 1 is a plan view showing the arrangement position of the inspection apparatus of the present invention, in which 1 is a conveyor line on which a weighing scale to be inspected, such as a health meter 2, is conveyed;
is an inspection device for the health meter 2. Although not shown, a spring adjustment table is provided on one side of the line upstream from the inspection device 3 on the conveyor line, and an unadjusted health meter 2 that is transported on the conveyor line 1 is installed.
The operator takes out the health meter, adjusts the spring on the adjustment table, and places the adjusted health meter at the carry-in starting end position A of the inspection device 3. The inspection device 3 is provided with a carry-in means for carrying the health meter 2 from the carry-in start position A to the test position B, and a carry-out means for carrying the health meter 2 from the test position B to the top of the conveyor line 1. The carrying means is constituted by a moving table as shown at 4 in FIG. 2, for example.
The moving table is configured to move forward and backward between a carry-in starting position A and an inspection position B by rotating a rotating chain (not shown) forward and backward by a motor. The carrying-out means has a structure in which an L-shaped claw body, as shown by 5 in FIG. 2, is provided on a rotary chain (not shown) arranged from a detection position B toward one direction of the conveyor line. By rotating this rotating chain with a motor (not shown) or the like, the health meter 2 at the inspection position B can be pushed out to the conveyor line 1 with the claws 5 hooked thereon.

Above the inspection position B, two or more (five in the illustrated example) reference weights 6 are attached to different arm rods 7...
It is hung independently by. Each weight 6...
When suspended, there is a constant distance t between the top and bottom. This is so that when the weights are lowered by the weight lowering means, which will be described later, the weights are loaded on the health meter sequentially starting from the lowest weight, and the loaded weight increases in stages. In other words, even if all the arm rods 7 are rotated by the same amount at the same time, the upper weight will be loaded with a delay of a time corresponding to the interval t, thereby increasing the loaded weight in stages. This is possible. Further, each of the arm rods 7... is configured to pivotally connect two rod rods 7a and 7b, and a stopper 8 is provided at the base end of one rod 7a so that it can be bent only upward. ing. By making the weights 6 bendable upward, all the weights 6 are connected to the health meter 2 as shown in FIG.
In this loaded state, the health meter 2 has a reference weight 6...
It is possible to prevent unnecessary loads such as the downward rotation moment of the arm rod 7 from being applied. The center of the rod 7b of each arm rod 7 is pivotally supported by a support 10 erected from the inspection device base 9, and the base end is extended to a movable rod 12 forming a part of the weight lowering means 11. It is pivotally mounted via the hole 13.

The weight lowering means 11 includes this movable rod 12, a drive shaft 14 inserted into the support column 10 so as to be slidable up and down, and a rack portion 14 formed at the lower end of the drive shaft.
It consists of a pinion 15 that meshes with the drive shaft 15, and a motor 16 with a reduction gear that rotates the pinion 15 and drives the drive shaft 14 up and down. The movable rod 12 and the drive shaft 14 are connected by a suitable connecting member (not shown), and the movable rod 12 moves up and down together with the drive shaft 14. As the movable rod 12 rises, the arm rods 7 lower the ends from which the weights are suspended, centering on the pivot points with the support columns 10. Due to this lowering, the reference weights 6... are sequentially moved at intervals of t, starting from the lower one.
The health meter 2 is loaded with a time delay corresponding to . In addition to the pinion 15, the motor 16 is connected to a light shielding plate 17 having a plurality of slits formed around its circumference. The light shielding plate 17 is provided between the light emitter 18a and the light receiver 18b, and the rotation speed of the motor 16 is detected by receiving the light passing through the slit of the light shielding plate 17 at the light receiver 18b. The number of reference weights 6 loaded on the health meter 2 can be indirectly detected from the rotation speed of the motor.

On the other hand, for the health meter 2 at the detection position B, for example, an image sensor 19 is installed as a sensor at a position that does not interfere with the reference weights 6 or the carrying means 5, and with the aim at the indication scale of the health meter 2. are provided as shown in FIG. This image sensor 19 focuses on the area circled by a circle on the indication scale 20 of the health meter shown in FIG. Each time the reference weights 6 are loaded on the health meter 2, the amount of deflection of the indication scale is detected. However, the standard weight 6
Immediately after the indicator scale is loaded, the indicator scale vibrates violently, so a control circuit, which will be described later, is controlled to detect the amount of deflection of the indicator scale after a certain period of time (several seconds) when the indicator scale stops vibrating. In this way, the signal (video signal) detected by the image sensor 19 is converted by the video control unit 21 into a signal that can be processed by the subsequent circuit, and is sent to the discrimination circuit 22. The determination circuit 22 compares whether the amount of deflection of the indicator scale detected by the sensor 19 is within a predetermined tolerance range, and if it is within the range, it is judged as OK.
If it is not within the range, a defect determination signal is issued. For example, if one reference weight (20Kg) is loaded on health meter 2, the tolerance for 20Kg is ±0.3Kg.
However, if the indication scale at that time indicates 21Kg, then since |21Kg−20Kg|>|±0.3Kg|, a defective determination signal is issued. However, since the weight to be compared with the amount of deflection of the indicator scale detected by the sensor 19 changes depending on the number of reference weights 6 loaded on the health meter 2, the discrimination circuit 22 includes the light receiver 18b. A signal is also input. In the discrimination circuit 22, the number of reference weights 6 loaded on the health meter 2 is known from the signal from the light receiver 18b, and the loaded weight is calculated. Further, the allowable error for each weight is stored in the discrimination circuit 22, and the allowable error for the corresponding weight is read out in response to a signal from the light receiver 18.

The good/bad judgment signal from the judgment circuit 22 is input to the control circuit 23. Based on the good signal, the control circuit 23 drives the weight lowering means 11 downward to load one more standard weight 6 on the health meter 2, and also to check the quality after all the standard weights 6 have been loaded. A series of operations is performed in which the weight lowering means 11 is driven upward by the signal to lift all the weights 6 from the health meter 2, and then the carrying out means 5 is operated to carry out the health meter 2 from the inspection position B. Let's do it. In addition, when a defective signal is applied from the discrimination circuit 22, it is generally sufficient to issue an alarm to prompt the spring adjustment operator to readjust the spring, but in this embodiment, the defective signal causes the weight lowering means 11 to At the same time, the carrying means 4 is operated backward to return the health meter 2 to the carrying side. As a result, the inspection of the health meter 2 is completely automated. In order to carry out such an automatic operation, the operations of the weight lowering means 11, the carrying-out means 5 and the carrying-in means 4 are controlled by the output of the discrimination circuit 23. In FIG. 2, the output line a of the control circuit 23 is a line for driving the motor 16 of the weight lowering means 11 in normal rotation, reverse rotation, and stopping;
The line c for stopping operation is a line for causing the carrying means 4 to rotate forward, reverse, and stop. The output line d is connected to the video control unit 2 in order to detect the amount of deviation of the indicator scale several seconds after the reference weight 6 is loaded on the health meter 2.
This is a line added to 1. However, this line d can also be added to the image sensor 19. In addition, a light receiver 18 is provided on the input side of the control circuit 23.
signal is added. If this is a good discrimination signal, the reference weight 6 loaded on the health meter 2...
This is because the reverse operation of lowering or raising the weight lowering means 11 is required depending on the number of times. Furthermore, although not shown, the carry-in start position A and the inspection position B
A millimeter switch is provided to detect the presence or absence of the health meter 2 and the health meter 2, and detection signals from these switches are sent to the control circuit 23 through input lines e and f.
has been added to. By providing these switches, it is possible to prevent the carrying-in means 4 from operating even though the health meter 2 is not present at the carrying-in start end, or from conducting an inspection even though the health meter 2 is not present at the inspection position B. . The input line g is an inspection start command. FIG. 6 shows a flowchart of the operation performed by the control circuit 23. Furthermore, the control circuit 23
and the discrimination circuit 22 can be constructed by a computer. In that case, the computer has the sixth
Programming can be done according to the flowchart shown in the figure.

Since the inspection device for the weighing scale to be inspected according to the present invention is configured as described above, the instructions for the weighing scale to be inspected are 2 times.
To automatically perform operations such as determining whether or not each of the different weights is within the allowable range, and carrying out the weighing scale from the inspection position if all the weights are within the allowable range. This has the effect of increasing the efficiency of inspection, saving labor, and reducing operating costs accordingly.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, FIG. 1 is a plan view showing the arrangement position of the inspection device, and FIG. 2 is A of FIG. 1.
- A sectional view, Figure 3 shows the state in which all reference weights are loaded on the weighing scale to be inspected, Figure 4 shows the state of sensor arrangement, and Figure 5 shows the state of the sensor. Figures 6A and 6B showing the indication scale are flowcharts showing a series of operations performed by the control circuit. 2... Weighing scale for inspection, 3... Inspection device, 4... Carrying means, 5... Carrying out means, 6... Reference weight, 11... Weight lowering means, 19... Sensor, 22... Discrimination circuit, 2
3...Control circuit, B...Inspection position.

Claims (1)

[Scope of Claims] 1. Means 4 for transporting a weighing scale 2 for testing, such as a health meter, to inspection position B; and a weighing scale 2 for testing, such as a health meter.
means 5 for carrying out the test position B from the test position B;
Two or more reference weights 6... are independently suspended above, and the reference weights 6... are lowered one by one onto the weighing scale 2 to be inspected to increase the carrying load of the weighing scale in stages. A weight lowering means 11, a sensor 19 that detects the amount of deflection of the indicating scale 20 of the weighing scale 2 to be inspected each time the reference weight 6 is loaded, and the sensor 19.
A discrimination circuit 22 generates a discrimination signal for determining pass/fail based on the deflection amount of the indicating scale detected by the weight lowering means 11 based on the pass/fail signal of the discrimination circuit 22.
is driven downward to load one more reference weight 6 onto the weighing scale 2 to be inspected, and all reference weights 6 are
The weight lowering means 11 is driven upward by the acceptance signal after loading the weights 6 to lift all the weights 6 from the weighing scale 2 to be inspected, and then the carrying out means 5 is operated to lower the weight to be inspected. An inspection device for a weighing scale to be inspected, comprising a control circuit 23 that controls a series of operations for carrying out a weighing scale 2 from an inspection position B. 2 The control circuit 23 drives the weight lowering means 11 upward in response to the defective signal from the discrimination circuit 22, and also controls the operation of retracting the carrying means 4 to return the weighing scale 2 to be inspected to the carrying side. An inspection device for a weighing scale to be inspected according to claim 1, characterized in that it is configured as follows.