JPH0136829Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a paper supply section of a machine (hereinafter referred to as a postal machine) that automatically processes paper sheets such as sealed letters, postcards, and cards.

As shown in Fig. 1, the conventional supply section has the following parts inside the supply section.
A group of paper sheets stored with the ends aligned 1
is run at a constant speed in front of the main vacuum chamber 2, and there are holes for suction at equal intervals equal to the length of the longest sheet that can be mechanically processed plus the clearance required for mechanical processing. A suction belt 3 picks up paper sheets one by one and sends them out onto a conveyance path. In this case, the distances between the front and rear paper sheets sent out from one end to the next end are equal intervals, so this delivery method is called "end feeding". In this end feed, even if the distance between the ends is constant, the distance between the end of the previous sheet and the leading edge of the next sheet, that is, the gap between the sheets, is not constant depending on the length of the sheet. Therefore, it is not constant.

When paper sheets are conveyed at a constant speed and processed continuously, the gap between the sheets is an important factor that limits the maximum processing speed of a mail machine, and when the gap falls below a certain value, the machine will not operate normally. I won't. In the case of end-feeding, the end spacing is determined according to the longest paper sheet to be processed so that the gap does not fall below a certain value.For short paper sheets, the gap is longer than the above-mentioned certain value. This means that the machine has more processing capacity. In order to make the most of the machine's capacity and maximize the machine processing speed, the above-mentioned clearance should always be kept at the minimum required for machine processing, regardless of the length of the paper sheets. I need to send it out.

In conventional end feed, as already explained,
When paper sheets have different lengths, it is not possible to feed them while maintaining a constant gap between them.

The purpose of the present invention is to provide a paper sheet feeding device that can eliminate the above-mentioned problems, maximize the capabilities of the machine, and improve the machine processing speed.

The present invention will be explained in detail below based on the drawings showing one embodiment of the present invention. Fig. 2 is a diagram showing an embodiment of the present invention, and the sum of the length of the shortest paper sheet that can be machine-processed and the length of the minimum gap that is allowable for mechanical processing is the length that can be machine-processed. This is an example of a case where the length is longer than the longest paper sheet. The suction belt 4 has suction holes formed at regular intervals.
This interval is the sum of the length of the shortest paper sheet that can be machine processed and the minimum gap allowed for mechanical processing, and when this suction hole passes through the main vacuum suction chamber 5, a suction force is generated. From a group of paper sheets 6 stored with their ends aligned, the one closest to the main vacuum suction chamber is taken out and sent to the conveyance path 7. At this time, an auxiliary vacuum suction chamber 8 is provided at the end of the stored paper to prevent the next paper from being pulled out due to friction or the like.
The auxiliary vacuum suction chamber attracts the end of the next paper sheet, preventing it from being dragged and sent out.

The suction belt 4 is driven by a drive roller 9, and the drive roller 9 is attached to the shaft of a control motor whose rotation speed can be switched between two stages: normal rotation and low speed rotation. When the paper sheet 10 is sent out to the conveyance path 7 and the next paper sheet 11 is sucked by the suction belt 4 and sent out, the tip of the paper sheet 10 is sent out to the detector 12.
(for example, a photoelectric converter), the paper sheet 1
The distance from the end of 0 is measured. This detected gap between sheets 11 is less than the minimum gap allowed for mechanical processing when the adsorption belt is running at normal speed. It is necessary to delay the gap between the paper sheets so that the gap between the sheets is equal to or greater than the minimum gap.

To explain with reference to FIG. 3, a signal of the detected gap between the paper sheets is sent to the control signal generation circuit 13, and this circuit calculates the difference between the minimum gap and the actual gap between the paper sheets. A signal of proportional magnitude (e.g. pulse number, pulse width or voltage magnitude) is generated by the circuit and this signal is transmitted to the motor control circuit 14.
sent to. The motor control circuit 14 switches the control motor 15 from normal rotation to low speed rotation for a period of time proportional to the magnitude of this signal. As a result, the suction belt runs at low speed for a certain period of time, the feeding of the suctioned paper sheet 11 is delayed, and the immediately preceding paper sheet 1
The gap with 0 is widened, and this gap becomes the minimum gap that can be machined.

By performing the above correction on paper sheets that are continuously fed in this way, the gap between the front and rear sheets can be kept to a certain minimum value, eliminating waste in mechanical processing and improving processing speed. This makes it possible to utilize the maximum capacity of the machine and obtain the highest processing speed for paper sheets.

As described above, according to the present invention, it is possible to reduce the gap between the front and rear sheets to a certain minimum value, making full use of the machine's capabilities and achieving the maximum processing speed of the machine. .

[Brief explanation of the drawing]

Figure 1 is a diagram showing a conventional paper sheet feeding device, Figure 2 is a diagram showing a conventional sheet feeding device.
The figure shows an embodiment of the present invention, and FIG. 3 is a diagram showing a control section in FIG. 2. In the figure, 1...A group of paper sheets, 2...Main vacuum suction chamber, 3...Suction belt, 4...Suction belt, 5...Main vacuum suction chamber, 6...A group of paper sheets,
7... Conveyance path, 8... Auxiliary vacuum suction chamber, 9... Drive roller, 10... Paper sheets, 11... Paper sheets, 1
2...Detector, 13...Control signal generation circuit, 14
...Motor control circuit, 15...Control motor.

Claims (1)

[Scope of utility model registration request] A vacuum suction chamber and a vacuum suction chamber with suction holes at regular intervals approximately equal to the sum of the shortest sheet length to be fed by running in front of the vacuum suction chamber plus the minimum clearance allowed for mechanical processing. A suction belt, a drive roller that is connected to a variable speed motor and drives the suction belt, detect the gap between the leading edge of the paper sheet being sucked and fed out, and the end of the previously fed paper sheet, and the gap is determined in advance. A paper sheet feeding device comprising: a motor control unit that generates a signal to control the speed of the variable speed motor to a low speed when the length is shorter than a predetermined length.