JPH0680271A - Paper conveying device - Google Patents

Abstract

PURPOSE:To provide a paper conveying device in which documents and paper sheets are not caught to a conveying guide, and to an aperture plate in particular, so as to prevent generation of a paper blockage, when documents and paper sheets are conveyed. CONSTITUTION:Vibrators 20 are set to an aperture plate 19, so as to vibrate the aperture plate minutely, and thereby, documents and paper sheets are not caught to the aperture plate 19 but conveyed smoothly. As a result, generation of a paper blockage is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device used for an image input device, a copying machine or the like and for sequentially feeding paper such as originals and printing paper.

[0002]

2. Description of the Related Art In copying machines, printers, image reading devices, etc., sheets such as originals and printing sheets are sequentially conveyed one by one from a stacked tray, conveyed to a printing section or a reading section, and further accumulated in a discharge tray. A paper transport device is provided.
For example, in the image reading device as shown in FIG.
A supply unit 1 for supplying a read document, a transport unit 2 for transporting the supplied document by a transport belt or a transport roller, a reading unit 3 for optically reading the transported document, and a discharge unit 4 for discharging the read document. It is composed of.

In the supply unit 1, the paper feed tray 12 on which the documents 11 are stacked is sent out one by one by the feed roller 13 to the transport unit 2. The sent document 11 is sent to the reading unit 3 on the carrying path 14 by the carrying roller 15 and the carrying belt 16. The reading unit 3 irradiates a predetermined area of the original 11 with light from the light source 17, reads the reflection term by the optical sensor 18 such as a CCD, converts it into a digital signal as image data, and transmits it to a computer or the like. In this reading unit 3,
An aperture plate 19 is provided as a conveyance guide in order to suppress the blurring of the document, and this portion is shown in FIG. The aperture plate 19 has an opening 19a, and a document is read through this opening 19a.
The aperture plate 19 is a guide for stabilizing the original at the focal position of the optical sensor, and the distance between the two is set to be slightly wider than the thickness of the original. The document 11 is sent to the discharge unit 4 after passing through the reading unit 3.

[0004]

As described above, the aperture plate serving as the conveyance guide has a narrow interval because it is necessary to prevent the movement of the document. For this reason, there is a problem in that the original is caught on this and a paper jam occurs.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a sheet conveying apparatus capable of preventing a sheet jam caused by a sheet caught on a conveying guide.

[0006]

In order to achieve the above-mentioned object, a sheet conveying apparatus according to the present invention uses a conveying roller formed on a conveying path formed by a plurality of conveying guides to convey a sheet.
This is a device for transporting one by one, and is provided with a transport guide vibrating means for vibrating at least one of the transport guides.

[0007]

The present invention has the above-mentioned structure, and the sheet is prevented from being caught by the conveyance guide by slightly vibrating the conveyance guide.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

The present embodiment is characterized in that a vibration means for newly vibrating the conveyance guide is provided in addition to the conventional apparatus. This vibrating means is the ultrasonic motor 20 in the case of this embodiment, and as shown in FIG. 1 and FIG. 1 and 2, the same components as those of the conventional device are designated by the same reference numerals, and the description thereof will be omitted.

When the document 11 is placed on the paper feed tray 12 and an instruction to read the document is given, the document 11 is fed one by one by the feed roller 13. Simultaneously with the start of the document feeding, the vibrator 20 is driven and the aperture plate 19 is driven.
Starts to vibrate.

The original 11 is sent to the reading section by the carrying roller 15 and the carrying belt 16. In the present embodiment, the reading unit 3 has two optical systems for reading the front and back of the original 11 at the same time. Since the document is conveyed vertically from bottom to top in the reading section 3, the two optical systems are arranged on the left and right as shown in the figure.

When the document 11 passes through the aperture plate 19, this gap is narrow and is fed upward against the force of gravity, so that the edge of the document is caught by the aperture plate 19 at this portion, and a paper jam easily occurs. But,
In this embodiment, since the vibrator 20 causes the aperture plate 19 to slightly vibrate, the document 11 can be prevented from being caught. Further, the vibrating means will be described in detail with reference to FIG. An aperture plate 19 is arranged on the frame 10 via a vibrator 21 and a stroke expanding mechanism 22. The vibrator 21 is made of piezoelectric ceramic or the like, and applies a voltage having a frequency of 100 to 2 kHz to move the aperture plate 19 to 10 to 5
It is configured to vibrate with an amplitude of 00 μm. The configuration of this vibrating means will be described in more detail in FIG. An aperture plate 19 is arranged on a vibrator 21 made of a piezoelectric ceramic via a stroke expanding mechanism 23. With this mechanism, the required amplitude of the aperture plate 19 can be secured even if a piezoelectric ceramic having a small amplitude is used.

FIG. 3 (c) shows another vibrating means. The aperture plate 19 is disposed on the frame 10 via a leaf spring 24 and is vibrated by the piezoelectric ceramic 21. The vibration of the aperture plate 19 is 0.1 mm or less even at the maximum, that is, it is sufficiently smaller than the focal depth of 3 to 4 mm of the optical system, and there is no problem that the vibration causes the image to be blurred when the document is read.
Further, although the vibrator is used as the means for vibrating the aperture plate 19 in the present embodiment, the present invention is not limited to this, and for example, vibration obtained by rotating an eccentric shaft may be used.

[0014]

As described above, according to the present invention, it is possible to prevent the paper from being caught in the guide by slightly vibrating the paper conveying guide, and it is possible to provide a paper conveying device without a paper jam.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a preferred embodiment according to the present invention.

FIG. 2 is a diagram showing a main part of this embodiment, particularly an aperture plate and a vibrating means.

FIG. 3 is a diagram showing details of a vibrating means of the present embodiment.

FIG. 4 is a diagram showing a configuration of a conventional device.

FIG. 5 shows a conventional device, in particular the aperture plate and the vibrating means.

[Explanation of symbols]

 11 manuscript 19 aperture plate 20 oscillator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeomi Koshimizu 4-7-35 Kitashinagawa, Shinagawa-ku, Tokyo Eastman Kodak Japan Co., Ltd.

Claims (1)

[Claims] 1. A sheet conveying device for conveying sheets one by one by a conveying roller along a conveying path formed by a plurality of conveying guides, wherein a conveying guide vibrating means for vibrating at least one of the conveying guides is provided. A paper transport device characterized by.