JPH07172619A - Paper sheet transport device - Google Patents

Abstract

PURPOSE:To prevent occurrence of collision noise and sliding noise due to contact of the sheet with an arc feeding guide when sheets are fed into the arc sheet feeding route formed by opposing two arc feeding guides. CONSTITUTION:In a paper sheet transport device provided with an arc sheet transport route 3 formed by opposing two arc transport guides 1 and 2, an air blowing mechanism 7 is provided closely to the arc transport guide 1, and also an air blowing hole 10 to blow air from the air blowing mechanism 7 to the sheet 4 that is being transported in the sheet transport route 3 is formed in the arc transport guide 1 on the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device having an arc-shaped sheet conveying path formed by facing two arc-shaped conveying guides.

[0002]

2. Description of the Related Art In recent years, image forming apparatuses such as copiers and printers have a built-in paper feed cassette to save space. Therefore, an arc-shaped paper conveyance path is used by using a small-radius arc-shaped conveyance guide. Are formed.

[0003]

When such an arc-shaped transport guide is used, a collision sound caused by the leading edge of the sheet carried into the paper transport path hitting the outer arc-shaped transport guide, and the paper carried into the paper transport path. A sliding contact sound is generated due to the scraped paper slidingly contacting the outer arc-shaped conveyance guide.

[0004]

The invention according to claim 1 is
In a paper conveyance device having an arc-shaped paper conveyance path formed by facing two arc-shaped conveyance guides, a blower mechanism is provided close to the arc-shaped conveyance guide, and wind from the blower mechanism is passed through the paper conveyance path. Blower holes for blowing the sheet being conveyed are formed in the outer arc-shaped conveying guide.

According to a second aspect of the present invention, in the first aspect of the invention, an air blowing hole for blowing air toward the downstream side in the sheet conveying direction is formed.

According to a third aspect of the present invention, in the first or second aspect of the invention, the outer arc-shaped conveyance guide is formed of a damping steel plate.

According to a fourth aspect of the present invention, in the first or second aspect of the invention, the outer arc-shaped conveyance guide is formed by a wire.

The invention according to claim 5 is the invention according to claims 1, 2, and 3.
Alternatively, in the invention described in item 4, a carry-in detection sensor for detecting that the paper has been carried into the paper transport path is provided on the entrance side of the paper transport path, and the air blowing mechanism is operated based on the detection result from the carry-in detection sensor. I was allowed to.

The invention according to claim 6 is based on claims 1, 2 and
In the invention described in claim 3, 4 or 5, a displacement detection sensor is provided for detecting that the sheet conveyed in the sheet conveyance path is displaced toward the inner arc-shaped conveyance guide side by a set value or more, and the detection result from the displacement detection sensor Based on the above, the air volume of the blower mechanism is reduced or set to "0".

[0010]

According to the first aspect of the present invention, by blowing air from the air blowing holes formed in the outer arc-shaped conveyance guide, the paper carried into the paper conveyance path does not hit the outer arc-shaped conveyance guide, and the leading edge of the paper is The collision noise caused by hitting the outer arc-shaped conveyance guide and the sliding contact noise caused by the paper slidingly contacting the outer arc-shaped conveyance guide are prevented.

According to the second aspect of the present invention, since the air from the air blowing hole blows out to the downstream side in the sheet conveying path in the sheet conveying direction, this wind helps convey the sheet, and jams in the sheet conveying path are eliminated. Occurrence is prevented.

According to the third aspect of the invention, even if the paper cannot hit the outer arc-shaped conveyance guide because the paper is stiff and cannot be sufficiently controlled by the wind, the arc-shaped conveyance guide is formed of the damping steel plate. Therefore, it is possible to reduce the occurrence of a collision noise caused by the leading edge of the sheet hitting the arcuate conveyance guide and a sliding contact noise caused by the paper slidingly contacting the arcuate conveyance guide.

According to the fourth aspect of the present invention, since the paper is stiff and cannot be sufficiently controlled by the wind and the paper hits the outer arc-shaped conveyance guide, the arc-shaped conveyance guide is formed by the wire. The area of contact with the paper is remarkably small, and the occurrence of collision noise due to the tip of the paper hitting the arc-shaped transport guide and sliding contact noise due to the paper slidingly contacting the arc-shaped transport guide are reduced.

According to the fifth aspect of the present invention, when the carry-in detection sensor detects that the paper has been carried into the paper transport path, the blowing mechanism operates based on the detection result.
Useless energy consumption is prevented.

According to the sixth aspect of the invention, since the stiffness of the sheet is weak, the sheet is largely displaced toward the inner arc-shaped conveyance guide side by the wind from the air blowing hole, and it is determined that the displacement amount is equal to or greater than the set value. When the detection sensor detects, the air volume of the air blowing mechanism decreases or becomes "0" based on the detection result, so that the sheet is prevented from slidingly contacting the inner arc-shaped conveyance guide.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. First, an arc-shaped sheet conveyance path 3 is formed by facing two arc-shaped conveyance guides 1 and 2, which are respectively formed in an arc shape, and a sheet 4 is placed on the entrance side and the exit side of this paper conveyance path 3. Conveyor rollers 5 and 6 that hold and convey
Are arranged.

Next, a blower mechanism 7 is provided on the outer peripheral surface side of the arcuate conveyance guide 1 on the outside, and the blower mechanism 7 includes a duct 8 fixed to the arcuate conveyance guide 1.
It is formed by a fan 9 attached to the end of the duct 8. Then, at a position of the arc-shaped conveyance guide 1 that faces the upstream side of the sheet conveyance path 3 in the conveyance direction, the wind from the blower mechanism 7 is directed into the sheet conveyance path 3,
In addition, a blower hole 10 that blows toward the downstream side of the sheet 4 in the transport direction is formed.

Here, a carry-in detection switch 11 which is a carry-in detection sensor for detecting that the paper 4 has been carried into the paper transport path 3 is provided at the entrance side of the paper transport path 3. Further, at a position facing the air blowing hole 10 in the paper transporting path 3, the paper 4 transported in the paper transporting path 3 is moved to the inner arc-shaped transport guide 2 side by the influence of the air blown from the air blowing hole 10. A displacement detection switch 12, which is a displacement detection sensor for detecting displacement of a set value or more, is provided. The carry-in detection switch 11 is a normally open type switch that is normally kept "open" and "closed" at the time of detection, and the displacement detection switch 12 is normally kept "closed" and detected at the time of detection. It is a normally-closed type switch that is "open", and these carry-in detection switch 11 and displacement detection switch 12 are connected in series between the fan 9 and the power supply 13. Further, the displacement detection switch 12 has a movable piece 12a for detection projected into the sheet conveyance path 3 from a hole 14 formed in the arc-shaped conveyance guide 2 inside.

In such a structure, when the paper 4 is not carried into the paper transport path 3, the carry-in detection switch 11 is "open" and the energization of the fan 9 is stopped.

When the paper 4 is carried into the paper transport path 3, the carry-in detection switch 11 is closed and the fan 9 is energized. Then, the wind generated by driving the fan 9 blows out from the air blowing hole 10 toward the inside of the sheet conveying path 3 and toward the downstream side in the conveying direction of the sheet 4. Accordingly, when the wind blows against the sheet 4 carried into the sheet conveying path 3, the sheet 4 floats above the inner peripheral surface of the arc-shaped conveying guide 1, and the leading end of the sheet 4 reaches the arc-shaped conveying guide 1. It is prevented that the sheet 4 hits the inner peripheral surface of the sheet 4 and the sheet 4 is prevented from slidingly contacting the arc-shaped transport guide 1. As a result, the tip end of the sheet 4 hits the arc-shaped transport guide 1 and a collision sound is generated or the sheet 4 slides on the arc-shaped transport guide 1. The generation of sliding contact noise due to the contact is prevented.

Moreover, the air blown from the air blowing hole 10 into the paper conveying path 3 blows out toward the downstream side of the paper 4 in the conveying direction, so that the air helps to convey the paper 4 and jams in the paper conveying path 3. Is prevented from occurring.

Next, when the stiffness of the sheet 4 is weak, the sheet 4 is largely displaced toward the inner arc-shaped transport guide 2 side by the air blown from the blower hole 10. However, when the displacement amount exceeds the set value, the sheet 4 contacts the movable piece 12a of the displacement detection switch 12 and the displacement detection switch 12 is in the "open" state. Then, when the displacement detection switch 12 is opened, the energization of the fan 9 is stopped and the blower hole 10
The blowing of the wind from is stopped. Therefore, the ventilation hole 10
It is possible to prevent the sheet 4 from slidingly contacting the inner peripheral surface of the arc-shaped conveyance guide 2 due to the wind blown from it to generate sliding contact noise.

In this embodiment, the case where the energization of the fan 9 is stopped when the displacement detection switch 12 detects the displacement has been described as an example. However, the displacement detection switch 12 performs the detection. Fan 9
It is also possible to adopt a structure in which the amount of air blown by the fan 9 is reduced by switching the drive voltage of 2 to a low value.

Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those described with reference to FIGS. 1 to 3 are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, the outer arc-shaped conveyance guide 1a is formed of a wire and the inner arc-shaped conveyance guide (not shown) is formed of a wire.

In such a structure, by forming the outer arc-shaped conveyance guide 1a with a wire, the paper 4 to be conveyed is stiff, so that the fan 4 blows the paper 4 away from the arc-shaped conveyance guide 1a. Even if the sheet cannot be fully fed, the arc-shaped transport guide 1a can
The area corresponding to is significantly reduced. Therefore, even if the leading edge of the sheet 4 hits or slidably contacts the arcuate conveyance guide 1a, the occurrence of collision noise and sliding noise is reduced.

Further, since the inner arc-shaped conveying guide is formed of a wire, the displacement of the sheet 4 cannot be detected by the displacement detecting switch 12 because the sheet 4 to be conveyed has a weak stiffness, and thus the sheet 4 cannot be detected inside. Even when the inner peripheral surface of the arc-shaped conveying guide is slidably contacted with the arc-shaped conveying guide,
Area of sliding contact with Therefore, it is possible to prevent the sliding contact sound from being generated due to the paper 4 slidingly contacting the inner arc-shaped conveyance guide.

If the inner and outer arc-shaped conveyance guides are formed of vibration-damping steel plates, even if the paper 4 hits the inner peripheral surface of the arc-shaped conveyance guide because the paper 4 is stiff or weak, the paper will not be curved. Vibration at the time of hitting the conveyance guide is reduced, and collision noise caused by the leading edge of the sheet hitting the arc-shaped conveyance guide and sliding contact noise caused by the sheet slidingly contacting the arc-shaped conveyance guide are reduced.

[0028]

As described above, the invention according to claim 1 has two advantages.
In a sheet conveying device having an arc-shaped sheet conveying path formed by facing a sheet of arc-shaped conveying guides, a blowing mechanism is provided in the vicinity of the arc-shaped conveying guide, and air from the blowing mechanism is conveyed in the sheet conveying path. Since the air blowing hole for blowing out the paper being conveyed is formed in the outer arc-shaped conveyance guide, the paper conveyed in the paper conveyance path is lifted from the inner peripheral surface of the outer arc-shaped conveyance guide by the air blown from the air blow hole. Therefore, it is possible to prevent the occurrence of a collision noise caused by the leading edge of the paper hitting the outer arc-shaped conveyance guide and a sliding contact noise caused by the paper slidingly contacting the outer arc-shaped conveyance guide.

According to the second aspect of the present invention, as described above, in the first aspect of the present invention, since the air blowing hole for blowing the air toward the downstream side of the sheet conveying direction is formed, the sheet is conveyed by the air blown from the air blowing hole. It is possible to assist the conveyance of the sheet conveyed in the path, and therefore, it is possible to prevent the occurrence of jam in the sheet conveyance path.

As described above, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the outer arc-shaped conveyance guide is formed of a vibration-damping steel plate. Even when the paper cannot be sufficiently contacted with the outer arc-shaped conveyance guide, it is possible to reduce the occurrence of collision noise caused by the leading edge of the paper hitting the arc-shaped conveyance guide and sliding noise caused by the paper slidingly contacting the arc-shaped conveyance guide. Have an effect.

As described above, in the invention according to claim 4, in the invention according to claim 1 or 2, since the outer arc-shaped conveyance guide is formed by a wire, the stiffness of the paper is strong, so that the control by wind is sufficient. Even if the paper hits the outer arc-shaped transport guide, the area where the paper hits the arc-shaped transport guide is significantly reduced. This has the effect of reducing the generation of sound.

As described above, the invention according to claim 5 is the invention according to claim 1, 2, 3 or 4, wherein the carry-in detection sensor for detecting that a paper has been carried into the paper carrying path is used. The blower mechanism is provided on the entrance side of the path, and the blower mechanism is operated based on the detection result from the carry-in detection sensor. Therefore, the blow-in mechanism is detected by the carry-in detection sensor when the paper has been carried into the paper conveyance path. Has an effect such that wasteful energy consumption can be prevented.

As described above, the invention according to claim 6 is, in the invention according to claim 1, 2, 3, 4 or 5, the value of the sheet conveyed in the sheet conveying path is set to the inner side of the arc-shaped conveying guide. Since the displacement detection sensor for detecting the above displacement is provided and the air volume of the air blowing mechanism is reduced or set to “0” based on the detection result from the displacement detection sensor,
When the displacement detection sensor detects that the paper is displaced toward the inner arc-shaped conveyance guide side by the set value or more due to the wind from the air blow hole because the paper is weak, the air volume of the air blowing mechanism decreases or becomes “0”, It is possible to prevent the sliding contact noise from being generated due to the sliding contact with the inner arc-shaped conveyance guide.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view.

FIG. 3 is a circuit diagram.

FIG. 4 is a perspective view showing a part of a second embodiment of the present invention.

[Explanation of symbols]

 1, 1a Outer arc-shaped transport guide 2 Inner arc-shaped transport guide 3 Paper transport path 4 Paper 7 Blower mechanism 10 Blower hole 11 Carry-in detection sensor 12 Displacement detection sensor

Claims (6)

[Claims] 1. A paper transporting apparatus having an arcuate paper transporting path formed by facing two arcuate transporting guides, wherein a blower mechanism is provided close to the arcuate transporting guides.
A sheet conveying device, wherein an air blowing hole for blowing air from the air blowing mechanism to the sheet being conveyed in the sheet conveying path is formed in the outer arc-shaped conveying guide. 2. The sheet conveying device according to claim 1, wherein an air blowing hole is formed to blow air toward the downstream side of the sheet in the conveying direction. 3. The sheet conveying apparatus according to claim 1, wherein the outer arc-shaped conveying guide is formed of a damping steel plate. 4. The sheet conveying apparatus according to claim 1, wherein the outer arc-shaped conveying guide is formed of a wire. 5. A carry-in detection sensor for detecting that the paper has been carried into the paper transport path is provided on the entrance side of the paper transport path, and the air blowing mechanism is operated based on the detection result from the carry-in detection sensor. The sheet conveying device according to claim 1, 2, 3, or 4. 6. A displacement detection sensor for detecting that a sheet conveyed in a sheet conveyance path is displaced toward a side of an inner arc-shaped conveyance guide by a set value or more, and a blower mechanism is based on a detection result from the displacement detection sensor. The air volume of the air is reduced or set to "0".
Alternatively, the paper transport device according to item 5.