JPS6048837A - Sheet feeder - Google Patents

Abstract

PURPOSE:To accomplish stable sheet feed operation by disposing a sheet separating projection between a plurality of vacuum suction sheet transport belts arranged on the base of a sheet feed tray and controlling the projecting amount of the projection according to the thickness of a sheet to be used. CONSTITUTION:A regulating member 2A for regulating the leading end of stacked sheets P is disposed on the front of a sheet feed tray 2, and a plurality of sheet transport belts 6 for adsorbing and feeding out the lowermost sheet by suction of a blower 8 are arranged on the base of the tray 2. A sheet separating projection 14 capable of advancing and retreating to project over the sheet adsorbing surface of the belt 6 is disposed between these plural belts 6. A decision means is adapted to decide the projecting amount of the projection 14 according to information from sheet thickness setting means, and a control means is adapted to operate driving means for advancing and retreating the projection 14. In this arrangement, even if the thickness of a sheet to be used is changed, stable sheet feed operation can be performed without misfeed and multifeed.

Description

[Detailed description of the invention]! FIELD OF THE INVENTION The present invention relates to a vacuum suction paper feeding device for multiple GM, facsimile, etc.

PRIOR ART In a paper feeding device equipped with several paper conveyance belts, the lowermost layer of paper is sucked and carried out by the suction action of a blower on the bottom of the paper feed tray, there is a Paper handling protrusions are provided that protrude from the paper suction surface of the paper conveyance belt. This paper handling protrusion has a function of maliciously lifting the laminated paper, and when it is lifted, y,=s'lS
The front edge of the paper feed tray is regulated by the wall in front of the paper feed tray. However, since only the lowest layer of paper to be carried out is attracted to the conveyor belt, its front edge, including the part that should originally have been lifted by the paper separation protrusion,
The M paper tray faces the paper exit formed below the wall in front of the paper tray, and is transported out of the paper exit as the conveyor belt moves.

However, in conventional paper feeding devices, the paper handling protrusion is fixed, so the amount of protrusion is constant, and if the protrusion amount is alternated for thin paper, it may cause misfeeds (paper misfeeds) when using thick paper. On the other hand, if the protrusion amount is set for thick paper, there will be a problem that double feeding (two or more sheets of paper may be fed) at the same time when using thin paper 7.
OBJECT OF THE INVENTION The present invention was devised against this technical background, and its purpose is to prevent misfeeds and electrical transmission errors even if the thickness of the paper used is changed by 3Y. The object of the present invention is to provide a paper feeding device that can carry out stable paper ejection without causing any problems.

Structure of the Invention The paper feeding device of the present invention has a structure in which it is moved forward and backward by an abrasive protrusion driving means disposed on the bottom of a paper feeding tray or located between several vacuum suction type paper conveyance belts, The type (thickness) of the paper to be used is inputted to the protrusion of the paper handling protrusion by the thickness setting means AY to the protrusion determining means B, and the protrusion amount determining means B
The paper type (thickness) information signal Z is given to the drive means operation control means C, and the control signal of the control means C causes the drive means to operate, thereby adjusting the amount of protrusion of the paper handling protrusion. (See Figure 1).

EXAMPLE 1 Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 2 to 4.

Figure 2 is a photocopy machine, Factor 91] etc.
1, a vacuum suction type conveyor belt device 3 is disposed on the bottom surface of a paper feed tray 2. This vacuum suction type conveyor belt device 3 includes a conveyor belt 6 which is stretched between a driving roll 4 and a driven roll 5 and has a large number of intake holes 7, and an intake chamber 9 having an opening T on the back side of the conveyor belt 6. and a blower 8 that communicates with the intake chamber 9 (see Figs. 2 and 3. However, Fig. 3 is a view of the black-m line in Fig. 2). .

The top wall 10 of the suction chamber 9 extends forward from the lower edge of the front wall 2A of the paper feed tray 2 by extending forward from the conveyance guide plate toaK7. c'iJ, t'L, the paper is conveyed along the conveyance guide plate tOa and guided to the conveyance roll 17.

Further, an opening 11 is formed in the top wall 10 at approximately the center of the pair of conveyor bells 1-6, and a paper handling protrusion 14 that can move forward and backward is provided in the opening 11. . this@,
The handling protrusion 14 is supported on the top of the star cony 15 so as to be relatively rotatable. Step 11 Knee 15, top wall 1
The bracket fixed to the back surface of the bracket 0 is screwed into the female screw part 13 attached to the bracket 2, and its lower half g is hollow, and is engaged with the rotor @16 of the stepping motor M by a spline. Therefore, when the rotor shaft 16 rotates due to the operation of the steering motor M, the screw 15
is raised or lowered, and the paper flap protrusion 14 is raised or lowered accordingly.
It also moves up and down (see Figure 4 0 (UL Figure 4 is a sectional view taken along the line IV-IV in Figure 3).

The stepping motor M is rotated by a predetermined rotation angle in response to a pulse signal provided by the computer 21. In the side number diagram, 22 is a motor control device, and the control device 22 is a control circuit that applies 7 pulses to each coil of the stepping motor M at an appropriate timing based on the output signal of the computer 21. It is composed of a drive circuit that amplifies its pulse.

Therefore, the paper handling protrusion 14 is projected higher than the upper surface of the conveyor belt 6 by H, but if the paper thickness of the paper P stored in the paper feed tray 2 is large Gj-, then H is small. ,
Conversely, if the paper thickness is small, H is set large. The value of H is determined in advance according to the paper thickness, and the paper P to be used is
If the input device 20 inputs information into the computer 21, for example, by distinguishing between "thick,""normal," and "thin," or in units of μ (microns), then depending on the input value, A pulse signal corresponding to the specified protrusion MH is given to the stepping motor M by the computer 21.

This embodiment is configured as described above, and the paper feed tray 2
When the input device 20 inputs the thickness 7 of the paper P into the computer 21, the stepping motor M operates in accordance with the command from the fan viewer 21, and the screw 15 rotates down integrally with the rotor shaft 16 and the rotor. is rotated by a predetermined angle, and the protruding amount H of the paper separating protrusion 14 changes from the paper P.
It corresponds to the thickness of , and has a value of 1°.

Next, when the stacked sheets of paper P7 are loaded into the first paper feed tray 2, the central part of the front end of the sled is lifted by the paper handling protrusion 14, and the front edge is regulated by the front wall 2A. While the blower 8 is operating, air is taken in from the suction hole 7 of the conveyor belt 6 through the suction chamber 9. At the same time, the bottom layer of paper is attracted to the conveyor belt 6 and lifted by the paper handling protrusion 14. The front edge to be covered also lies along the top wall 10 surface.

As the conveyor belt rotates 60 times, only the lowest layer of paper is conveyed out through the outlet defined by the front wall 2A and the top wall 1 (J) and sent to the conveyor roll 171.

After this, if you want to replace the used paper with thin M paper,
The paper thickness of the new paper to be stored in the paper feed tray 2 is input from the input device to the feeder 21, and the paper handling protrusion 14Z is input.
The thickness is increased to a protrusion amount H corresponding to the paper thickness. Conversely, when using thick M-paper vinyl, the A-separation protrusion 14 is lowered.

As is clear from the fact that the explanatory power exceeds the effect of the invention, the present invention provides a copying machine,
In facsimile machines, etc., a paper handling protrusion is installed between several vacuum suction type m paper conveyance belts arranged on the bottom of three paper trays, and the amount of protrusion of this paper handling protrusion is determined. Since it is configured so that it can be adjusted according to the thickness of the paper being used, even if the thickness of the paper used is changed, misfeeds or double feeds will not occur, and troubles can be prevented from occurring. This will improve the operating efficiency of the machine.

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram showing the configuration of the present invention, Fig. 2 is a vertical sectional side view of a paper feeding device according to an embodiment of the present invention, and Fig.
In the figure -■ Line arrow view, Figure 4 is the same as in Figure 3.
-rv i sectional view. ■...Paper feeding device, 2...Paper feeding tray, 2A...Front wall, 3...Vacuum suction conveyor belt device, 4...Drive roll, 5...Followed roll 6...・・Transport belt, 7
...Intake hole 8...Blower-19...Intake chamber, 1
0... Top wall, HJ Q... Conveyance guide plate, 11...
・Opening, 12...Bracket, 13...Female screw part,
14...Paper handling protrusion, 15...Screw, I6
... Rotor shaft, ]7 ... Conveyance roll, Addition ... Input device, 21 ... Computer, 22 ... Motor control device, M ... Stella Doknob Motor〇 Agent Patent Attorney Jiang Hara Nozomi 1 person

Claims (1)

[Claims] 18 A regulating section is provided on the front of the paper tray to regulate the front edge of the stacked paper, and a blower is provided on the bottom of the paper feed tray.
In a paper feeding device having a plurality of paper conveyance belts that absorb and transport the lowest layer of paper by the suction action of a determining means for determining the amount of protrusion of the paper handling protrusion based on information from a retractable a-bar that can protrude above the paper suction surface of the paper; A paper feeding device comprising a control means for controlling