JPS60232335A - Paper feeder - Google Patents

Abstract

PURPOSE:To enable the lifting and separation of paper through a simple construction, by using a rotor on an eccentric shaft to curve the paper toward a conveyance belt to attract the paper on the belt. CONSTITUTION:Before a conveyance belt 2 is revolved, a rotor 20 on an eccentric shaft is rotated by one round in the direction opposite to that of conveyance by the conveyance belt 2, so that the uppermost P of sheets of paper is curved. After the curved sheet P is attracted on the conveyance belt 2 by suction pressure applied by a suction fan 4, the belt 2 is revolved to convey the uppermost sheet P toward a carry-out roller 5.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper feed device used in a copying machine, etc., and more specifically, the present invention relates to a paper feed device used in a copying machine, etc., and more specifically, a paper feed device that lifts the paper by ejecting air to the end surface of the paper placed on a paper feed tray. The present invention relates to a paper feeding device having a structure in which only the uppermost paper among the floated papers is conveyed by a conveyor belt and fed to a recording unit or the like.

[Prior art]

Conventionally, there is a device of this type having a configuration as shown in FIG. 1, for example. That is, in FIG. 1, the conveyor belt 2 is disposed above the end (the front end in the conveyance direction) of the elevating paper feed tray 1 on which the paper P is placed, and is A discharge blower 3 and a suction blower 4 that blow out air are provided. Furthermore, a drive roll 5 for carrying out and a driven roll 6 are arranged in front of the transport belt 2 in the transport direction, and a switch 7 for detecting passage of the leading edge of the paper is provided in front of these rolls 5.6. .

Furthermore, a switch 8 is provided behind the conveyor belt 2 to detect the stacking height of sheets. Further, a nozzle 9 for squeezing the air ejected to the end surface of the paper, and a valve 10 for opening and closing the air passage from the discharge blower 3 to the suction blower 4 are provided.

In this configuration, first, the suction blower 4 and the discharge blower 3 are activated by a paper feed start signal. As a result, air discharged from the discharge blower 3 is supplied via the nozzle 9 to the end surface of the leading end of the paper P loaded on the paper feed tray 1. Then, the upper sheet of the sheets P loaded on the sheet feed tray 1 is floated by this air.

Figure 2 shows this situation.

In this state, the pulp 10 is opened, and the suction pressure of the suction groove 4 is applied to the most of the floated paper through the opening of the vacuum plenum 11 and holes (not shown) provided in the conveyor belt 2. It acts on the uppermost paper P1, and this uppermost paper P1 is attracted to the surface of the conveyor belt 2. At this time, the air discharged from the nozzle 9 is
and the next paper P2.
1 and P2 are separated. Thereafter, a feed clutch (not shown) is turned on after a certain period of time, and rotational force is applied to the transport roll 12. As a result, the conveyor belt 2 is conveyed in the direction of the uppermost sheet P1tl, the unloading drive opening, and the roller 5. Since rotational force is constantly applied to the carry-out drive roll 5 and the driven roll 6, when the paper P1 is sent from the conveyor belt 2, this double stack of paper is further carried forward. Then, when the leading edge of the paper P1 is detected by the switch 7, the feed crank, which applies rotational force to the transport roll 12, is turned off, and the nozzle roller 10 is turned off.
is closed.

Such an operation is repeated every time a paper feeding start signal is given, and the paper carried out by the carrying out drive roll 5 is supplied to the next process.

On the other hand, when the stacking height of the paper P becomes lower as the paper feed progresses, the switch 8 is activated, and the elevating motor provided on the elevating paper feed tray 1 is activated, so that the uppermost paper P1 is always kept at a constant position. Adjusted to make it lively.

In this way, the conventional paper feeding device shown in FIG.
After the upper paper P is levitated by the air discharged from the upper paper P, the uppermost paper P1 of the floated paper P is attracted to the conveyor belt 2 by the suction pressure of the suction blower 4, and at the same time, the next paper P is It is separated from the goose.

For this reason, the structure for flotation and separation of paper becomes complicated, large in size, and expensive.

[Purpose of the invention]

The present invention has been devised in view of these drawbacks, and its object is to provide a paper feeding device that can float and separate paper with a simple and inexpensive structure.

[Structure of the invention]

The present invention curves the paper in the direction of the conveyor belt by applying a force in the opposite direction to the conveyance direction to the end of the paper by a rotor of an eccentric shaft, and then the curved paper is attracted to the conveyor belt by an adsorption means. It is constructed so that it can be transported by

〔Example〕

FIG. 3 is a diagram showing an embodiment of the present invention, and the difference from the conventional structure is that the discharge blower 3, nozzle 9, and pulp 10 are removed, and a rotor 20 of an eccentric shaft is newly installed on the conveyor belt 2. It was placed at the bottom. Eccentric shaft rotor 20
This is accomplished by applying a force in the opposite direction to the transport direction to the uppermost sheet P as shown in the figure. This rotor 20 is the conveyor belt 2
The paper P is curved by rotating once before a rotational force is applied to the paper P. Then, while the paper P is maintained in its curved state, the paper P is attracted to the conveyor belt 2 by the suction pressure (which is constantly applied) from the suction blower 4, as shown in FIG. After this adsorption, a rotational force is applied to the conveyor belt 2 and the conveyor belt 2 is sent in the direction of the carry-out roll 5 .

Such operations are repeated every time a paper feed start signal is applied.

In this case, the rotor 20 only needs to have the function of bending the paper P toward the conveyor belt 2. For example, as shown in FIG. It may also be paddle-shaped like the one that occurs in .

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the rotor of the eccentric shaft bends the paper toward the conveyor belt and adsorbs the paper to the conveyor belt. Since there is no need for a blower, nozzle, or pulp, the structure can be extremely simple, and it can be made inexpensive and compact.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the configuration of a conventional device, Fig. 2 is a diagram showing a paper transport state in the conventional device, Fig. 3 is a diagram showing an embodiment of the present invention, and Fig. 4 is a diagram showing paper transport operation in the embodiment. FIG. 5 is a diagram showing another example of the eccentric shaft rotor. DESCRIPTION OF SYMBOLS 1...Paper feed tray, 2...Transportation belt, 4...Blower for suction, 5...Drive roll for carrying out, 11...Nonokumuzolinum, 12...Transportation roll, 20・
...Rotor, P, P,,P,...Paper. Figure 1

Claims (1)

[Claims] A conveyance belt disposed above the edge of the paper feed tray on which paper is loaded, and an eccentric shaft that applies force to the edge of the paper in the opposite direction to the conveyance direction to curve the paper in the direction of the conveyance belt. and a suction means for adsorbing the uppermost sheet of the sheets curved by the rotor to the conveyor belt, and the sheet attracted to the conveyor belt is conveyed by driving the conveyor belt. paper feed device.