JPH0450268Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper sheet feeding device, particularly to a paper sheet feeding device for a machine that automatically processes paper sheets such as envelopes and postcard cards.

[Prior art] Fig. 2 is a block diagram of a conventional paper sheet feeding device, Fig. 3 is a schematic diagram of the vicinity of the vacuum suction chamber, and Fig.
In Figure 3, 1 is the main vacuum suction chamber, 2 is the auxiliary vacuum suction chamber, 3 is the adsorption belt, and the main vacuum suction chamber 1
The auxiliary vacuum suction chamber 2 is connected to a vacuum pump 13 communicating with it via an air filter 10.

Paper sheets 4, which are stored with their ends aligned in the supply device, run in sliding contact with the front of the main vacuum suction chamber 1, and are picked up one by one by a suction belt 3, which has holes for suction at equal intervals. and sent out. At this time, to prevent two sheets from being sent out at the same time due to mutual friction between the sheets, the end of the next sheet is sucked,
An auxiliary vacuum suction chamber 2 having a holding function is provided.

On the other hand, the main vacuum suction chamber 1 and the auxiliary vacuum suction chamber 2 communicate with each other through a pipe or the like 5, and are connected to an opening 7 of an air switching valve 6. In addition to the opening 7, the air switching valve 6 is provided with an opening 8 and an opening 9.
Nothing is connected to the opening 8, and the opening 9 is connected to a vacuum pump 13 via an air filter box 10.

When the suction belt 3 is in operation, the openings 7 and 9 are in communication, and air flows from the openings 7 to the openings 9 as shown by the thick solid line 11. However, when the suction belt 3 stops, etc. The valve 6 operates and the openings 8 and 9 communicate with each other, and the thick broken line 12
Air flows directly from the outside air to the opening 9 through the opening 8 as shown in FIG.

The suction belt 3 has suction holes formed at equal intervals, and when the suction holes slide against the front surface of the main vacuum suction chamber 1 and pass through, suction force is generated, and the paper sheets 4 stored therein are sucked. As mentioned above, the auxiliary vacuum suction chamber 2 is provided below the main vacuum suction chamber 1, where one sheet of paper closest to the main vacuum suction chamber 1 is sucked and sent out. The end portion of the paper sheet 4 is suctioned to prevent the next paper sheet from being dragged by the paper sheet suctioned by the suction belt 3 and being sent out due to mutual friction between the sheets.

While the suction belt 3 is being driven, the openings 7 and 9 of the air switching valve 6 are in communication, and the pressure of the vacuum pump 13 is transmitted to the main vacuum suction chamber 1 and the auxiliary vacuum suction chamber 2, resulting in negative pressure. A suction force is generated.

The suction force, that is, the air pressure (negative pressure) of the main vacuum suction chamber 1 and the auxiliary vacuum suction chamber 2, has a great effect on the feeding accuracy such as the interval at which paper sheets are sent out and the accuracy of feeding each sheet, and if the negative pressure is too strong, , the next paper sheet is suctioned through the suction belt, and the next paper sheet is fed out in duplicate, so-called double-sheet feeding is becoming more common. On the other hand, if the negative pressure is too weak, heavy paper sheets may not be attracted and sent out. This negative pressure is adjusted by a regulating valve 15.

The suction belt 3 stops when the stored paper sheets run out, or when the fed paper sheets jam and the machine stops. At this time, the air switching valve 6 operates, the openings 8 and 9 communicate with each other, and the outside air flows through the openings 8 and into the openings 9. The air filter box 10 is disposed between the vacuum pump 13 and the air switching valve 6, and serves to protect the vacuum pump 13 by removing dust, dirt, etc. contained in the air that passes through it. The air filter in the air filter box 10 becomes clogged as air passes through it, and the pressure drop increases at the air filter portion.As a result, the suction power of the main vacuum suction chamber 1 and the auxiliary vacuum suction chamber 2 decreases. Paper sheet feeding accuracy decreases.

In this case, if you want to maintain high supply accuracy,
The adjustment valve 15 must be adjusted according to the degree of clogging of the air filter.
If the clogging of the air filter goes unnoticed, there is a problem that the supply accuracy decreases.

The purpose of this invention is to detect the state of clogging of the air filter and correct the clogging of the air filter by opening and closing the adjustment valve according to the degree of clogging, so that the pressure of the vacuum pump can be adjusted under certain conditions. It is possible to provide a paper sheet feeding device that can obtain an appropriate suction force that is transmitted to the main vacuum suction chamber and the auxiliary vacuum suction chamber, and has high feeding accuracy.

[Means for solving problems]

According to the present invention, there is a main vacuum suction chamber, a suction belt that runs in sliding contact with the front of the main vacuum suction chamber and has holes for suctioning paper sheets, and a front hole that is installed in parallel with the main vacuum suction chamber and has a through hole on the front surface. and a vacuum pump communicating with the front hole main vacuum suction chamber and the auxiliary vacuum suction chamber via an air filter, wherein the main vacuum suction chamber, the auxiliary vacuum suction chamber, and the air an air switching valve provided between air pipes connecting the filters to switch the air suction direction; a detector for detecting clogging of the air filter; and a valve control unit operated based on the output of the detector. , an adjustment valve that is controlled by the valve control unit and that adjusts the amount of air passing through the air filter based on the output of the detector when the air switching valve is switched to the outside air side and sucks air from the outside air; There is obtained a paper sheet feeding device characterized in that it includes the following.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

In Figures 2 and 3, parts with the same symbols indicate parts with the same function, and in Figure 1, a detector 16 that detects the degree of clogging of the air filter and the degree of clogging are shown in Figure 1 to ensure that an appropriate suction force is always obtained. A valve control circuit 17 for controlling the opening and closing of the valve 15 according to the conditions is provided in the middle of a pipe 14 connecting the vacuum pump 13 and the air filter box 10.

There is a correlation between air filter clogging and flow rate, such as when the air filter becomes clogged, the flow rate decreases. The detector 16 is a flow rate detector, and determines the degree of clogging of the air filter by measuring the flow rate.

When the air filter becomes clogged and the flow rate decreases, the valve control circuit 17, which is electrically connected to the detector 16, opens the regulating valve 15 to maintain a proper flow rate. When the valve is opened to the maximum extent and no longer opens, the regulating valve 15 cannot adjust the flow rate and the air filter needs to be cleaned, so the valve control circuit 17 sends an alarm signal to the outside.

On the other hand, if the flow rate is too high, the suction force will become too strong and cause double feeding, etc., so the adjustment valve 15 is closed until the appropriate flow rate is reached.

The above flow rate adjustment is performed when the switching valve 6 is operated and the air flow is on the thick broken line 12, that is, when air can be directly drawn from the outside air, in order to detect only the state of air filter clogging. When the air flow is indicated by the large solid line 11, that is, when the suction belt 3 is moving, the flow rate is not adjusted because the flow rate fluctuation is large.

[Effect of idea]

This invention detects the state of clogging of the air filter and corrects the clogging of the air filter by opening and closing the adjustment valve according to the degree of clogging, thereby reducing the pressure of the vacuum pump to the main vacuum suction under certain conditions. The suction force is transmitted to the chamber and the auxiliary vacuum suction chamber to obtain an appropriate suction force, which has the effect of increasing supply accuracy.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 and FIG. 3 are block diagrams of an example of a conventional sheet feeding device, and a perspective view of its main vacuum suction chamber. 1...Main vacuum suction chamber, 2...Auxiliary vacuum suction chamber,
3...Adsorption belt, 4...Paper sheets, 5...Connection pipe, 6...Switching valve, 7, 8, 9...Switching valve opening, 10...Core filter box, 1
3...Vacuum pump, 14...Connection pipe, 15...
...adjustment valve, 16...detector, 17...valve control circuit.

Claims (1)

[Scope of utility model registration request] A main vacuum suction chamber, a suction belt that runs in sliding contact with the front surface of the main vacuum suction chamber and has holes for sucking paper sheets, and an auxiliary vacuum suction that is installed in parallel with the main vacuum suction chamber and has a through hole on the front surface. and a vacuum pump communicating with the main vacuum suction chamber and the auxiliary vacuum suction chamber via an air filter, wherein the main vacuum suction chamber and the auxiliary vacuum suction chamber are connected to the air filter. an air switching valve installed between the air pipes to switch the air suction direction; a detector for detecting clogging of the air filter; a valve control unit operated by the output of the detector; and the valve control unit. and an adjustment valve that is controlled by and that adjusts the amount of air passing through the air filter based on the output of the detector when the air switching valve is switched to the outside air side and air is sucked from the outside air. A feeding device for paper sheets.