JPH0515466Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a machine that processes paper sheets of various sizes such as mail, and is particularly applicable to machines that process paper sheets of various sizes such as mail. Regarding the supply device.

[Conventional technology]

Conventionally, in this type of supply device, a main chamber and a subchamber connected to an air suction device such as a blower are fixed on a supply board, a plate having suction holes is attached to the front surface of each chamber, and a A suction belt having holes corresponding to the suction holes in the front plate is driven in contact with the surface of the front plate. When the suction holes in the main chamber align with the holes in the suction belt, the paper sheets placed in front of the suction belt are attracted and conveyed by the suction belt. The subchamber is located below the main chamber and on the opposite side of the paper sheet recording direction, and by suctioning and holding the second sheet on its front plate, the next sheet is carried by the suction belt. Prevent multiple feeding of paper sheets.

[Problem that the invention attempts to solve]

The above-mentioned conventional feeding section has the following drawbacks in processing both long and short paper sheets because the positions and intervals between the main chamber and the subchamber on which the suction belt is applied are fixed.
In terms of a machine that processes mail, the feeding section of this type of machine usually handles mail in the range of 140 mm to 235 mm in the length direction, but if it feeds mail with longer lengths, the second As shown in the figure. Since the suction belt suction part processes the smallest mail item with a length of 140 mm, for example, for large mail items with a length of 320 mm, the suction belt start part (arrow part) is closer to the end side. If the paper is thin and of poor quality, there is a drawback that the feeding condition becomes unstable as shown in FIG. 2b.

On the other hand, the supply pitch is determined according to the maximum length of the mail, so compared to the case where only mail with a length of 140 mm to 235 mm is targeted, the longer pitch means that these regular mail The disadvantage is that the supply speed is reduced.

[Means for solving problems]

The paper sheet feeding device of the present invention differs from the conventional suction belt type feeding section by dividing the main chamber into two chambers, and providing an electromagnetic valve in the chamber chamber air system on the upstream side in the conveying direction. By turning the solenoid valve ON and OFF according to the length of the paper sheet to be picked up, the point at which paper sheet suction starts can be varied.

〔Example〕

Next, the present invention will be explained with reference to the drawings. Figures 1a and 1b show an embodiment of the present invention. FIG. 1a shows a case where paper sheets (generally referred to as paper sheets) having a length of 140 mm to 235 mm are supplied. At this time, the electromagnetic valve 2 provided in the air system of the lower main chamber chamber 1 is opened. In other words, negative pressure is applied to both main chamber chambers. This condition is the same as when feeding by the conventional suction belt method, and the suction belt for paper sheets...3
The starting point of adsorption is around the arrow A section. When the suction holes in the upper and lower main chamber chambers match the holes in the suction belt 3, the paper sheets are sucked and conveyed, and are sent to the downstream processing process by the conveyance system 4. On the other hand, the subchamber...5, like the main chamber, is connected to a suction device such as a blower by an air hose and is subjected to negative pressure. Subchamber...
By suctioning the end of the next sheet, the suction belt 5 prevents the next sheet from being created and fed together with the sheet being suctioned and conveyed by the suction belt 3.

FIG. 1b shows a case where paper sheets having a length of 235 mm to 340 mm (referred to as large paper sheets) are supplied. At this time,
Lower main chamber chamber...1 electromagnetic valve...2
is closed. In other words, only the upper main chamber chamber 6 is subjected to negative pressure. For large paper sheets, the suction force is activated only when the holes in the suction belt (3) align with the suction holes (6) in the upper main chamber chamber. In other words, compared to case a when normal paper sheets are fed, the suction start part is b.
It looks like the area around arrow B, which is the leading edge of large paper sheets.

Furthermore, when feeding large sheets of paper, the driving speed of the suction belt 3 is simultaneously reduced to increase the conveyance pitch of the sheets in the conveyance system with a constant conveyance speed. One example of this means is to use a speed control motor as a drive device for the suction belt.

[Effect of idea]

As explained above, the present invention divides the main chamber into two chambers in the conveying direction to handle relatively short regular paper sheets and longer large paper sheets. By opening and closing the electromagnetic valves installed in the air system to these divided main chambers, the part where the suction belt starts to pick up paper sheets can be varied, making it possible to stably supply both types of paper sheets. be. Further, it is possible to obtain a paper sheet supply section that does not reduce the supply speed of short ordinary paper sheets in order to process large paper sheets.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a case where large paper sheets are supplied by a conventional method.

Claims (1)

[Scope of utility model registration request] A main chamber connected to negative pressure, a subchamber provided behind the subchamber to which negative pressure is supplied, a front plate provided at the front of each chamber and having suction holes, and corresponding to the suction holes in the front plate of the main chamber. a suction belt that has holes and is driven in the conveyance direction; a conveyance system that receives paper sheets taken out by the suction belt and sends them to a processing process;
In a paper sheet feeding device consisting of a plate for aligning the ends of paper sheets, the main chamber is divided into two chambers in the transport direction, and an electromagnetic valve is provided in the chamber chamber air system on the upstream side in the transport direction, and the paper sheets are supplied. When the paper sheet is not a large paper sheet, the electromagnetic valve is opened to drive the main chamber chambers on both the upstream and downstream sides, and when the paper sheet to be fed is a large paper sheet, the electromagnetic valve is closed and the main chamber chambers are driven on the downstream side. A paper sheet feeding device characterized in that the leading end of large paper sheets is sucked only in the main chamber of the paper sheet.