JP2006016159A - Air suction type paper feeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air suction type paper feeding device capable of stably feeding paper sheets over thin to thick paper without requiring delicate adjustment. <P>SOLUTION: A protruding member for separating paper sheets protruding downward from a suction face of a conveyance belt in the vicinity of a side face of the conveyance belt is arranged and can move in the horizontal direction on a face of the conveyance belt. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air suction type paper feeding device.

  In the conventional air suction type paper feeder, the paper separating from the belt suction surface in the vicinity of the transport belt to separate the top paper and the second paper from the top and reliably transport only the top paper. Protrusion members are provided (see, for example, Patent Document 1). This paper separating projection member is formed by partially bending the paper adsorbed on the adsorption surface to form a gap between the uppermost paper and the second sheet so that separation air can easily enter. However, the paper separating projection member has become a factor that causes the paper jam due to poor paper feeding, as the thickness of the paper increases and the rigidity increases, the uppermost paper is less likely to be attracted to the transport belt.

  Therefore, a method has been proposed in which the amount of protrusion of the paper separating projection member is varied according to the thickness of the paper (see, for example, Patent Document 2). However, the appropriate range of the protruding amount of the sheet separating projection member is as very small as about 0 to 3 mm, and it is relatively difficult to control the protruding amount with respect to the sheet thickness with high accuracy. May not be fully demonstrated.

JP-A-61-254438

JP-A-10-218401

  An object of the present invention is to provide an air adsorption type paper feeding device that can feed paper from thin paper to thick paper stably without making fine adjustments.

In order to solve the above problems, the following means have been invented.
(1) a paper stacking tray, a first air jetting means for floating the upper part of the paper stacked on the paper stacking tray, a second air jetting means for separating the floated paper, Air suction type paper feed having a transport belt that sucks and transports the uppermost paper on the paper stacking tray, and a paper separation protrusion member that protrudes downward from the suction surface of the transport belt in the vicinity of the side surface of the transport belt In the apparatus, the sheet separating projection member is configured to be movable in a horizontal direction on the surface of the conveying belt.
(2) The air separation mechanism according to claim 1, wherein the disposition of the sheet separating projection member is changed according to the sheet thickness information, and the thicker and more rigid sheet is controlled so as to be further away from the conveying belt. Adsorption type paper feeder.

  According to the present invention, it is possible to set the amount of bending of the paper with higher accuracy, and it is possible to stably feed from thin paper to thick paper without fine adjustment.

  The present invention will be described below with reference to the drawings.

  FIG. 1 shows a side view of an embodiment of the present invention. FIG. 2 shows a front view of an embodiment of the present invention. A sheet 2 stacked on a sheet stacking tray 1 in a sheet hopper (not shown) is positioned by an inner wall of the sheet hopper and two sheet guides 3 and 4. The uppermost sheet 5 of the sheets 2 stacked on the sheet stacking tray 1 is detected by a sheet height detection sensor 6 provided in the sheet guide 4 and controlled so as to have a predetermined height. An air flow supplied from a blower (not shown) is ejected from the air nozzle 7 and the side nozzle 8. Several sheets float from the top of the sheet 2 due to the air flow ejected from the air nozzle 7 and the side nozzle 8. The uppermost sheet 5 and the second sheet of the sheet floated by the air flow ejected from the separation air nozzle 12 are separated. The conveying belt 9 having a large number of suction holes installed above the leading end of the sheet 2 sucks the uppermost sheet 5 by the internal air chamber 10 being sucked by a blower (not shown) and becoming negative pressure. Transport. The sheet 5 sucked by the conveying belt 9 is bent by the sheet separating projection members 11 provided on both sides of the conveying belt 9, and a gap is formed between the uppermost sheet 5 and the sheet immediately below it. The air flow ejected from the separation air nozzle 12 enters the gap between the sheets, and prevents the sheets from being double-fed.

  Since the thick sheet has high rigidity, the uppermost sheet 5 is not bent by the sheet separating projection member 11 as in the case of a thin sheet and is not easily attracted to the transport belt. Therefore, by moving the sheet separating projection member 11 in the horizontal direction with respect to the surface of the conveying belt 9 as indicated by the arrow in FIG. 2, the amount of bending of the sheet is reduced and even thick sheets are attracted to the conveying belt. Make it easier.

  Accordingly, in the conventional method in which the protruding amount of the sheet separating projection member 11 is changed according to the sheet thickness, the setting range of the protruding amount is 0 to 3 mm. It becomes possible to set the setting range of the position of the projection member 11 within a range of about 0 to 100 mm in terms of the distance from the end of the conveyance belt 9.

  The means for moving the paper separating projection member 11 is not particularly limited, but can be easily implemented by using a driving device such as a motor and a mechanical link mechanism.

It is a side view which shows one Example of the air adsorption system paper feeder in this invention. It is a front view (A direction perspective view of Drawing 1) showing an example of an air adsorption system paper feeder in the present invention.

Explanation of symbols

1 is a paper stacking tray, 2 is paper, 3 is a paper guide, 4 is a paper guide, 5 is a top paper, 6 is a paper height detection sensor, 7 is an air nozzle, 8 is a side nozzle, 9 is a conveyor belt, 10 is An air chamber, 11 is a paper separating projection member, and 12 is a separating air nozzle.

Claims (2)

A paper tray,
First air blowing means for floating the upper part of the paper stacked on the paper stacking tray;
A second air ejection means for separating the floated paper;
A conveying belt that sucks and conveys the uppermost sheet on the sheet stacking tray;
In an air suction type paper feeding device having a paper separating projection member that protrudes downward from the suction surface of the transport belt in the vicinity of the side surface of the transport belt,
The air suction type paper feeding device, wherein the paper separating projection member is configured to be movable in a horizontal direction on the surface of the conveying belt. 2. The air suction system supply according to claim 1, wherein the disposition of the paper separating projection member is changed according to information on the thickness of the paper, and the thicker and more rigid paper is controlled so as to be further away from the conveying belt. Paper device.

Images