JPS583773Y2 - Synchronization device for automatic packaging machine article feeding - Google Patents

Description

[Detailed description of the invention] This invention feeds articles at predetermined intervals into a cylindrical bag made of a synthetic resin sheet, welds and melts the articles at predetermined lengths, and automatically transfers the articles using the same sheet. The present invention relates to an automatic packaging machine for continuous packaging, and more particularly to a synchronizing device for supplying articles that can feed the articles in synchronization with the speed change when the packaging speed of the packaging machine changes.

Generally, as shown in Fig. 1, an automatic packaging machine 1 is equipped with an entrance conveyor 2 that is continuously operated by the power of the machine 1 in its front stage, and further in front of it is an inlet conveyor 2 that supplies goods in an intermittent operation that is started by a start signal. A conveyor 3 is provided.

The entrance conveyor 2 is configured to have a predetermined interval t (for example, this t causes the rotation shaft 4 of the conveyor 20 to rotate once.

) blades 5, 5... are pivotally attached to each
The article A sent onto the article supply conveyor 3 is transferred by the same conveyor 3 which is driven at the appropriate time by a start signal, and the article A is transferred to the entrance conveyor 2 which is continuously operating. It must be ensured that A is delivered and received exactly at the position immediately in front of the blade 5.

Therefore, the conventional method is to attach a one-rotation cam (not shown) to the rotating shaft 4 so as to emit a notch signal every one rotation, and use this notch signal as the start signal to start the article supply conveyor 3. It is used to start driving.

Therefore, if the wrapping speed of the automatic packaging machine 1, that is, the speed of the continuously running inlet conveyor changes, the timing of the start of the article supply conveyor 3 to which this article A was delivered must be changed, otherwise the above-mentioned situation will occur. As a result, the article A will not be delivered or received at the desired position on the entrance conveyor 2.

Therefore, in order to adjust the timing, it is necessary to operate the one-rotation cam in the structure to adjust the mounting position relative to the rotating shaft 4. Therefore, the screw tightening work is performed automatically each time. Not only must the operation of the machine 1 be stopped, but it is also necessary to perform trial runs several times and make adjustments while testing whether or not the article A is delivered to the desired position.

The present invention attempts to solve these difficulties, and its features include the provision of an angle-to-voltage converter 6 that generates a voltage that changes linearly in response to the rotation angle of the artificial conveyor 20. , a speed-voltage converter T whose output changes in response to changes in the speed of the entrance conveyor 2 is provided, and a voltage change line from the angle-voltage converter 6 is compared with the output voltage from the speed-voltage converter T. The device 8 detects the matching point between the two, and transmits a start pulse at the same point, and this pulse is used as the start signal for the article supply conveyor 3.

Various types of angle-to-voltage converters 6 can be used here, but as shown in FIG. Generates a voltage according to the rotation angle of 360°,
A voltage change line V as shown in FIG. 2 may be obtained,
The potentiometer in this case may be either a contact or non-contact potentiometer.

Alternatively, the origin pulse and signal pulse may be obtained from a rotary transducer instead of the potentiometer, introduced into the counter circuit, and subjected to DC-AC conversion to obtain the voltage change line V.

Furthermore, as shown in FIG. 6, a light shielding plate 11 is interposed between the emitter 9 and the light receiver 10 so that the amount of light received by the converter 10 changes linearly by one rotation, and the plate 11 is rotated by the rotating shaft 4. The purpose can also be achieved by obtaining a voltage proportional to the rotation angle.

On the other hand, by associating a speed-voltage converter 7 such as a tacho generator 1' with the rotating shaft 4 of the input conveyor 20, when the packaging speed of the automatic packaging machine 1 changes, an output voltage proportional to the speed is generated. The output voltage from the angle-voltage converter 6 is introduced into the comparator 8 via the interface 12, and the output voltage v0 is also input to the converter 8, so that both voltages V
.

As shown in FIG. 4, the output from the comparator 8 is generated at the intersection of the voltage V1 and the voltage change line V (at a rotation angle of 180° in the figure), that is, at the matching point P. Since it is applied to the differentiating circuit 13 connected to the next stage,
The output from comparator 8 is 36081, which is not self-holding, and becomes a start pulse SP like the mouth in the same figure.
This is used as a start signal for driving the article supply conveyor 3 using general means.

Next, when the packaging speed of automatic packaging machine 1 changes,
The transfer speed of the entrance conveyor 2 also changes accordingly, but at this time the output voltage from the speed-voltage converter T automatically changes to <vz as shown in FIG.

Therefore, in the illustrated embodiment, v2 also increases due to the increase in packaging speed, and the matching point P may be at 180° or the matching point P may be at 270°.
', the generation of the start pulse SP' is delayed by 90 degrees, and thus the article A is always delivered to and received at the desired position on the entrance conveyor 2.

As described above, the present invention generates a start pulse at the point where the voltage change line V from the angle-voltage converter 6 and the output voltage from the speed-voltage converter T of the entrance conveyor 2 match, and transmits this pulse to the article supply conveyor 3. Therefore, even if the packaging speed changes, the output voltage from the speed-voltage converter 7 can dynamically obtain the synchronized force for feeding the article, and the removal of the cam can be easily achieved. This eliminates the wasted effort and time of repeating installation and adjustment many times, and enables fully automatic control.

[Brief explanation of drawings]

Fig. 1 is an actual explanatory diagram of the synchronizing device according to the present invention, Fig. 2 is a voltage change diagram with respect to rotation angle showing the output voltage of the angle-voltage converter in the device, and Fig. 3 is a diagram showing the output voltage of the angle-voltage converter in the same device. Figure 4 shows a diagram showing the output voltage of the speed-voltage converter over time, and Figure 4A shows the relationship between the voltage change line at a certain packaging speed and the above output voltage. The waveform diagram, 49 ports in FIG. 5 is a relationship diagram corresponding to the 9 ports in FIG. 4 at other packaging speeds, the waveform diagram, and FIG. FIG. 1...Automatic packaging machine, 2...Entrance conveyor, 3...Goods supply conveyor, 5...
・Blade, 6...Angle-voltage converter, 7...
... Speed-voltage converter, 8... Comparator, P
, P'... Matching point, sp , sp'...
・Start pulse, ■・・・Voltage change line, V l
tv2...Output voltage.

Claims (1)

[Scope of utility model registration request] An article supply conveyor that is driven intermittently by a start signal, and a continuously operating entrance conveyor that receives articles transferred from the conveyor and pushes the articles into the entrance of an automatic packaging machine using blades provided at predetermined intervals. In the article supplying device, an angle-to-voltage converter is provided that generates a voltage that linearly changes in response to the rotation angle of the entrance conveyor, and the output changes in response to changes in the speed of the entrance conveyor. A speed-voltage converter is provided,
A comparator detects a matching point between the voltage change line of the angle-voltage converter and the output voltage from the speed-voltage converter, and transmits a start pulse at the same point. A synchronization device for supplying articles of an automatic packaging machine, which is used as a start signal for the conveyor for supplying articles.