JPS62201765A - Image-transferred sheet conveying device for copying machine - Google Patents

Abstract

PURPOSE:To make it possible to prevent creases, deviations in image transfer and distortion, by constituting a means for conveying a sheet to a fixing means, only with an upstream side roller pair composed of an upper roller and a downstream side lower drive roller. CONSTITUTION:An image-transferred sheet P separated from a photosensitive drum 3 by means of an one-side separating belt 4 is liable to delay in conveyance on the belt 4 laying side, without its leading end reaching a nipping point between upstream side roller pair 9, but a lower downstream side drive roller has no upper opposing roller, and therefore, it is possible to prevent a delay in conveyance. Further, since an image transferred sheet P is held in a free condition, the sheet may be conveyed to a fixing roller 6 without exerting compulsive force to the sheet P. Thus, even if the image transferred sheet is conveyed being slightly skewed, it is possible to prevent creases in the sheet, deviations in image transfer, distortion in image transfer and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field The present invention relates to a transferred paper conveying device for a copying machine, and more specifically, it relates to a transferred paper conveying device for a copying machine, and more specifically, it is used to transport only one side of the photoreceptor drum in order to separate the transferred paper from the photoreceptor drum. The present invention relates to a transferred paper conveying device for a copying machine, in which a separating means is attached to the image forming apparatus, and an upstream roller pair and a downstream roller means are respectively interposed on the separating means side up to the fixing roller.

(b) Problems to be solved by the conventional technology and the invention When conveying the transferred paper separated from the photoconductor drum to the fixing means, conventionally, the transferred paper is suctioned and held onto the conveying belt by suction to ensure a secure transfer. However, the problem was that the structure was complicated and the cost was high.

As a means to solve these problems, for example, a conveyance roller is used. However, this conveyance roller cannot contact the toner image transferred onto the paper because it has not yet been fixed, and therefore is normally installed so as to contact (pindle) only one side margin of the transferred paper. Moreover, as shown in FIG. 3, after the transferred paper (Pa) is separated from the photosensitive drum (3a) by the one-sided separation belt (4a),
The transferred paper is transferred between an upstream roller pair consisting of an upper roller (7a) and a lower drive port roller (8a), and an upper roller (10a).
) and a lower drive roller (IIA), which conveyed the image to the fixing roller (6a).

By the way, when the transferred paper (Pa) is conveyed by each pair of rollers, the leading edge of the transferred paper (Pa) rarely reaches the engagement point of each pair of rollers (the nub point), and therefore, each time it reaches the pair of rollers, The side of the transferred paper (Pa) that is in contact with the roller, that is, the side of the belt on one side, is conveyed with a slight delay.

Of course, since there is no contact with the roller on the opposite side of the transferred paper, there is no delay.

Particularly, as mentioned above, in the downstream roller pair far from the one-sided separation belt (4a) attached to the photoreceptor drum (3a), the transferred paper (Pa) often lags behind the belt side, and as a result, the transferred paper (Pa) is parallel The fixing roller (
6a), there is a great possibility that wrinkles may occur, and that distortion may affect the upstream side, causing transfer deviation and transfer distortion at the trailing edge of the paper.

(c) Means for solving the problem and its operation This invention includes a photosensitive drum rotatably installed in the main body of a copying machine, and a photosensitive drum for separating transferred paper from the photosensitive drum. A separating means attached to one side, a conveying means for the separated transferred paper, and a fixing means, and the conveying means includes an upstream roller pair consisting of an upper roller and a lower drive roller, and a downstream lower drive roller. This is a transferred paper conveying device for a copying machine consisting only of rollers.

That is, in the present invention, by configuring the downstream roller means with only a lower drive roller (without an upper roller), the transferred paper can be conveyed in a free state, thereby reducing slanting. Furthermore, even if the paper is slightly slanted, no forced force is applied to the transferred paper to prevent wrinkles, misalignment of the rear edge of the transfer, distortion of the transfer, etc.

(d) Examples The present invention will be described in detail below based on examples shown in the drawings. Note that this invention is not limited to this.

In Figures 1 and 2, a transferred paper separation and conveyance device (1) of a copying machine includes a photosensitive drum (3) rotatably installed in the main body of the copying machine, and a transferred paper (P) from this photosensitive drum.
One side separation belt (4) attached to one side of the photoreceptor drum (3) to separate the separated transferred paper (P
) and a fixing roller (6).

However, the conveyance means (5) consists of an upstream roller pair (9) consisting of an upper roller and a lower drive roller (8), and a lower drive roller (11).

On the other hand, the upstream roller pair (9) and the lower drive roller (111
Since the toner image transferred to the transferred paper has not yet been fixed, it cannot be contacted at the toner image transfer area, and therefore only the one side margin (B) formed on the side of the separation belt (4) of the transferred paper It is installed so that it contacts (pinches) the

Thus, one side separation belt (4) is removed from the photoreceptor drum (3).
) The transferred paper (P) separated by the upstream roller pair (9) causes a conveyance delay on the opposite side of the rollers, that is, on the side where the one-sided separation belt (4) is installed. That is, the leading edge of the transferred paper (P) rarely reaches the nip point of the roller pair (9) directly, and therefore the side of the transferred paper that comes into contact with the roller pair is slightly delayed. On the other hand, the side of the transferred paper opposite to the roller pair contact side does not come into contact with the roller pair, so there is no delay, and in the end only the roller pair contact side of the transferred paper is delayed. However, since the lower drive roller (11) on the downstream side does not have an opposing upper roller, it is possible to further prevent conveyance delays and to hold the transferred paper in a free state. The image can be transported to the fixing roller (6) without applying any forced force to the image. In other words, even if the transferred sheet is conveyed slightly diagonally when conveyed to the fixing roller (6), it is possible to prevent the sheet from wrinkling, transfer misalignment at the trailing edge, distortion of the transfer, etc.

Note that the downstream drive roller R υ has protrusions (or protrusions) 041 parallel to the axial direction formed on its surface at M angle intervals,
As a result, it can be printed in small sizes such as postcards and business cards.
In the case of stiff paper, the rear end of the paper can be pushed by the protrusion G41 to reliably convey it to the fixing roller (6). Of course, even if the transferred paper is short in the transport direction,
The drive roller (1υ) allows for reliable conveyance without slipping.

Here, for reference, an example of the dimensions of the protrusion (14) of the drive roller (IT) is shown.

Drive roller (outer diameter of 111: 16.0 mm protrusion (1
4) Height: 1. Omm length: 55 mm Pitch: 10'' Note that, unlike the above embodiments, the lower drive roller may be a flat roller without the above-mentioned protrusions.

Further, in the present invention, a method using a separation belt as a separation means has been described, but the present invention is not limited to this, and can also be applied to a type using a so-called separation claw or a type using a corona discharger. It is possible.

Although the fixing means has been described using a pair of rollers for fixing, it is also applicable to a type of fixing means that fixes the paper by conveying the paper under pressure between a roller and a plate-like member.

(E) Effects of the Invention According to the present invention, it is possible to prevent wrinkles of the transferred paper, trailing edge transfer deviation, and transfer distortion.

[Brief explanation of drawings]

FIG. 1 is a functional side view of the main part showing an embodiment of the present invention, FIG. 2 is a plan view of the main part functionally, and FIG. 3 is a functional explanatory diagram of the main part showing a conventional example. (1)・・・Transferred paper separation and conveyance device of copying machine,
(3)...Photosensitive drum, (4)...
・One side separation belt, (5)... Conveyance means,
(6)...... Fixed roller, (Force... Upper roller, (8)... Lower driving roller, (9
)...upstream roller pair, (111...downstream drive roller pair, (14)
...Protrusion.

Claims (1)

[Scope of Claims] 1. A photoreceptor drum rotatably installed in the main body of the copying machine, and a separating means attached to one side of the photoreceptor drum to separate the transferred paper from the photoreceptor drum; A copying machine comprising a conveying means for the separated transferred paper and a fixing means, the conveying means comprising only an upstream roller pair consisting of an upper roller and a lower drive roller, and a downstream lower drive roller. Paper transport device. 2. The apparatus according to claim 1, wherein the lower drive roller on the downstream side has a plurality of dispersed protrusions formed on its surface to enhance the conveying force of the transferred paper.