Claims
- 1. A method of feeding and conveying and correcting a position of an edge of a copying paper for use in a copyng machine provided with at least two pairs of conveying rollers on a conveying passage of said copying paper prior to a transferring process of the copying machine, wherein a paper feeding means and the conveying rollers are driven synchronously with the driving of an optical system of the copying machine so that the position of the top edge of the copying paper is to be at least twice corrected by making the top edge of the copying paper contact the at least two pair of conveying rollers so as to cause the copying paper to make at least two deflections, wherein the copying paper is once deflected while being conveyed by the paper feeding means and one of the at least two pairs of conveying rollers and is deflected a second time while being conveyed by two of the at least two pairs of conveying rollers; wherein the first deflection is effected by operating the paper feeding means for a period of time when one of the at least two pair of conveying rollers is stopped and the second deflection is effected by operating one of the at least two pair of conveying rollers for a period of time when another of the at least two pair of conveying rollers is stopped.
- 2. A method of feeding and conveying and correcting a position of an edge of a copying paper for use in a copying machine as set forth in claim 1, wherein the copying paper is deflected by contacting the pair of conveying rollers most near the transferring position and the pair of conveying rollers disposed directly before the pair conveying rollers most near the transferring position, respectively.
- 3. An apparatus for feeding and conveying a copying paper for use in a copying machine provided with at least two pairs of conveying rollers on a conveying passage prior to a transferring process of said apparatus, wherein a copying paper detector for detecting a copying paper fed from a paper feeding means is provided somewhat upstream from said pairs of conveying rollers of an upper reach side for providing a first deflection of said copying paper, said pair of conveying rollers of said upper reach side being disposed in the upper reaches of the conveying direction, the top of said copying paper contacting said pair of conveying rollers of said upper reach side by means of said paper feeding means and said pair conveying rollers of said upper reach side on the basis of a signal from said copying paper detector so as to provide a first certain definite deflection to said copying paper, whereby the position of the top of said copying paper is once corrected, and wherein a second certain definite deflection is provided to said copying paper when the top of said copying paper is brought into contact with said pair of conveying rollers of a lower reach side nearest the transferring position, whereby the positional state of the top of said copying paper is again corrected, and wherein said pair of conveying rollers of said lower reach side are driven synchronously with the drive of an optical system of said apparatus for exposing manuscript; wherein said first certain deflection is effected by operating said paper feeding means for a period of time when one of said at least two pair of conveying rollers is stopped and said second certain deflection is effected by operating one of said at least two pair of conveying rollers for a period of time when another of said at least two pair of conveying rollers is stopped.
Priority Claims (1)
| Number |
Date |
Country |
Kind |
| 59-31233 |
Feb 1984 |
JPX |
|
BACKGROUND OF THE INVENTION
This application is a continuation of now abandoned application Ser. No. 699,839, filed Feb. 8, 1985.
1. Field of the Invention
The present invention relates to an improved method and apparatus for feeding and conveying copying papers in a copying machine provided with at least two pairs of conveying rollers on a conveying passage used for transferring copying papers.
2. Description of the Prior Art
In general, an electrostatic photographic copying machine is constructed so that a copying paper 2 housed in a cassette 1 may be conveyed to the transferring position, at which a transferring apparatus 6 and the like are disposed, one by one by means of a paper-feeding roller 3 disposed in the vicinity of said cassette 1, conveying rollers 5 and 5' provided on a conveying passage 4 and the like, where an image formed on a photoreceptor 7 is transferred onto said copying paper, and then the appointed fixation may be carried out, as shown in FIG. 1.
Said conveying passage 4 is a passage from said conveying roller 5 to said photoreceptor 7.
Since the paper-feeding force of said paper-feeding roller 3 becomes unstable due to the frictional force between said copying paper 2 and said paper-feeding roller 3 when said paper-feeding roller 3 is rotated in the usual copying machine of this type, the position of the top edge of said copying paper 2, which has been conveyed to said conveying roller 5 for conveying said copying paper 2 synchronously with the drive of an optical system such that the top edge of said copying paper 2 is initially inclined. That is, the paper is in the condition in which the top edge of said copying paper 2 is not at right angles to the conveying direction but is inclined thereto. The paper position is subsequently corrected in said conveying roller 5. That is, the above described correction of the position of the top edge of said copying paper 2 is carried out by leaving a considerable space between guide plates 8 and 8' and making said copying paper 2 bend in such a manner as shown by an imaginary line 2' in FIG. 1 be engaging the pointed end of said copying paper fed from said paper-feeding roller 3 with the nipping position of said conveying roller 5 standing still.
However, since even a copying machine which has a comparatively long conveying passage 4 and at least two pairs of conveying rollers 5 and 5' which are provided on said conveying passage 4 is adapted to carry out the above described correction of the position of the top edge of said copying paper 2 by means of a pair of conveying rollers, (usually a pair of conveying rollers 5 of the upper reach side), it is necessary to make said copying paper 2 bend to a sufficiently large extent by engaging said copying paper 2' with the nipping position of said conveying rollers 5 standing still in order to correctly carry out said correction.
However, when the amount of bending (deflection) of said copying paper 2 is increased, some creases are generated on said copying paper 2', whereby the adherence of said copying paper 2' to said photoreceptor 7 is lowered, and as a result, an image cannot be distinctly transferred onto said copying paper 2'. On the other hand, when thick copying papers are used, the deflection of said copying paper to the extent required for the correction of the position of the top edge of said copying paper cannot be obtained, whereby said correction cannot be surely carried out.
It is an object of the present invention to provide a method and apparatus for feeding and conveying copying papers wherein the extent of a deflection of a copying paper is reduced by causing the deflection of a copying paper, which is being conveyed, at least two times, whereby the correction of the position of the top edge of said copying paper can be accurately carried out.
US Referenced Citations (3)
| Number |
Name |
Date |
Kind |
| 3963339 |
Taylor et al. |
Jun 1976 |
|
| 4457614 |
Nakajima et al. |
Jul 1984 |
|
| 4548394 |
Koyama et al. |
Jun 1985 |
|
Foreign Referenced Citations (4)
| Number |
Date |
Country |
| 0059631 |
Aug 1982 |
EPX |
| 3223048 |
Dec 1983 |
DEX |
| 0180548 |
Nov 1982 |
JPX |
| 0049561 |
Mar 1984 |
JPX |
Continuations (1)
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Number |
Date |
Country |
| Parent |
699839 |
Feb 1985 |
|
Patent Grant
4708456
