JPH0551141A - Paper transport device - Google Patents

Abstract

(57) [Abstract] [Purpose] To form a paper transporting device used for printers such as office machines, which is small and lightweight, and has low power consumption and low noise. [Structure] A cylinder 9 having an air suction port 8 for sucking a sheet 2, a piston 10 which is combined with the cylinder 9 and located on the side of the air suction port 8 by the elasticity of a coil spring 11, and the piston 10 is sucked. Electromagnet for
12 is provided with a paper suction mechanism, and the electromagnet 12
Magnetizes the piston 10 to lower the air pressure in the cylinder 9 to suck and separate the sheet 2 of the sheet stacking unit 1 adhered to the air suction port 8 for conveyance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material (hereinafter referred to as a sheet) from a stack of sheet materials such as copying machine sheets.
The present invention relates to a sheet conveying device that sucks and separates sheets one by one and conveys them to a predetermined position.

[0002]

2. Description of the Related Art Conventionally, a sheet conveying device in an office machine having a printing function such as a copying machine, a facsimile machine, a printing machine or the like sucks and separates sheets one by one from a sheet stacking section by air suction, and fixes them at a predetermined position. Was being transported to.

FIG. 3 is a schematic cross-sectional view of a conventional sheet conveying apparatus using air suction. In FIG. 3, 20 is an air suction port, 21 is a tube as an air passage thereof, and 22 is a vacuum pump for sucking air. Is. In this structure, the air suction port 20 with the rotation shaft 20A as a fulcrum rotates in the direction of arrow A as shown by the broken line in the figure to adhere to the sheet stacking portion 23, and the vacuum pump 22 sucks air. By doing so, one sheet of paper is adsorbed. The air suction port 20 is rotated in the direction of the arrow A'as shown by the solid line with the rotation shaft 20A as a fulcrum while the paper is adsorbed to hold the paper between the transport roller 24 and the pressure roller 25. In this case, the sheet is sent to the left transport section in the figure.

[0004]

However, in the above-mentioned conventional paper transporting apparatus, the vacuum pump 22 occupies a large volume, and the paper transporting apparatus using the vacuum pump 22 is large in size and heavy in weight. It has drawbacks such as power consumption and high noise.

In view of the various problems described above, an object of the present invention is to provide a sheet conveying device which is small and lightweight, and has features of low power consumption and low noise.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a cylinder having an air inlet for paper at its end, a piston which is combined with this cylinder and is located on the side of the air inlet by the elasticity of a coil spring, A sheet suction mechanism constituted by an electromagnet provided outside the cylinder for sucking the piston is provided, and the air suction port is pressed against the sheets in the sheet stacking unit in the initial state of sheet conveyance, and sheet conveyance is performed. At the start, the electromagnet is magnetized and the piston is attracted to reduce the air pressure in the cylinder, so that the sheets in the sheet stacking section are adsorbed and separated one by one, and the sheet is held between the transport roller and the pressure roller. It is characterized in that it is moved to a predetermined position.

[0007]

According to the present invention, the reciprocating piston sucks the air in the cylinder by the electromagnet which does not require a large amount of electric power, and the sucking force sucks and separates the sheet to convey it. Because of its small size, light weight, and low power consumption of the electromagnet, a paper transporting device that is small in size and lightweight, low in noise, and low in power consumption is provided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic sectional view of the structure of an embodiment of the present invention. In FIG.
Is a paper case accommodating the paper stacking portion 1, 3'is a cutout portion of the paper case, 4 is a paper protection claw for supporting the lower edge of the paper stacking portion 1 formed in the paper case 3, 5,
Reference numeral 6 denotes a transport roller for transporting the separated sheet 2, and a pressure roller for bringing the sheet 2 into contact with the transport roller 5 and applying pressure thereto. Reference numeral 7 is a paper suction portion for sucking the paper 2, 7A is a rotating shaft of the paper suction portion 7, 8 is an air suction port provided in the paper suction portion 7, 9 is a cylinder, 10 is a piston that reciprocates in the cylinder 9, 11 is a coil spring for returning the piston 10 to a fixed position by elasticity, 12 is a terminal
The magnetizing power is turned on and off from the electromagnet 13 to drive the reciprocating motion of the piston 10. The reciprocating motion lowers the air pressure in the cylinder 9.

FIG. 2 is a diagram showing an initial state of the sheet conveying apparatus of FIG. 1, and the same reference numerals as those in FIG. 1 are used.

In the initial state of the sheet conveying device shown in FIG. 2, the sheet suction section 7 is pressed against the lower sheet of the sheet stacking section 1 from the cutout section 3'of the sheet case 3, at which time the electromagnet 12 is de-excited. It is the state of. Therefore, the piston 10 is moved to the cylinder 9 as shown by the elasticity of the coil spring 11.
It is positioned so as to be crimped to the side of the air suction port 8 and the air inside the cylinder 9 is discharged.

In the conveying operation of the sheet 2, first, when a driving current is applied from the terminal 13 to the electromagnet 12, the electromagnet 12 is magnetized and the piston 10 is attracted by the magnetic force. As a result, the air pressure inside the cylinder 9 is reduced, and the sheet 2 that has been pressed by the sheet suction unit 7 is sucked. The sheet suction unit 7 rotates around the rotation shaft 7A in the suctioned state to bring the sheet 2 into contact with the transport roller 5 as shown in FIG.

When the sheet 2 comes into contact with the transport roller 5, the pressure roller 6 moves from the solid line position to the dotted line position, and the sheet 2 is sandwiched between the transport roller 5 and the pressure applied to the transport roller 5 and the sheet. The conveyance of the paper 2 is started by the friction with the paper 2.

At this time, when the current applied to the terminal 13 is turned off, the attraction force of the electromagnet 12 disappears, and the piston 10 is rapidly returned to the initial state of FIG. 2 by the elasticity of the coil spring 11. As a result, the paper 2 is separated from the paper suction unit 7, and the carrying roller 5 carries the paper 2 to a predetermined position. At the end of the sheet conveyance, the sheet suction unit 7 is rotated around the rotating shaft 7A to return to the initial state of FIG. 2, and the sheet 2 is ready for suction separation and conveyance.

According to the present invention, by repeating the above-described operation, the sheets 2 can be sucked and separated one by one from the sheet stacking section 1 in the sheet case 3 and conveyed.

[0015]

As described above, since the sheet conveying apparatus of the present invention uses the cylinder and the piston driven by the electromagnet for the sheet suction mechanism, it is more compact than the conventional sheet suction mechanism such as a vacuum pump. , Light weight, low power consumption and low noise can be used for adsorption / separation and transportation of paper.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of the configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing an initial state in the paper transport device of FIG.

FIG. 3 is a schematic cross-sectional view of the configuration of a conventional paper transport device.

[Explanation of symbols]

1 ... Paper stacking section, 2 ... Paper, 3 ... Paper case,
4 ... paper protection claw, 5 ... conveying roller, 6 ... pressurizing roller, 7 ... paper adsorbing part, A7 ... rotating shaft, 8 ... air inlet, 9 ... cylinder, 10 ... piston, 11 ... coil spring, 12 ... Electromagnet, 13 ... terminal.

Claims (1)

[Claims] 1. A cylinder having an air suction port for a sheet at an end thereof, a piston which is combined with the cylinder and is located on the air suction port side by the elasticity of a coil spring, and a cylinder for sucking the piston. A sheet suction mechanism composed of an electromagnet provided outside is provided, and the air suction port is pressed against the sheets in the sheet stacking section in the initial state of sheet conveyance, and the electromagnet is magnetized at the start of sheet conveyance. By sucking the piston, the air pressure in the cylinder is reduced, the sheets in the sheet stacking section are sucked and separated one by one, and the sheets are held between a conveyance roller and a pressure roller and transferred to a predetermined position. Paper transport device characterized by.