JPH0356336A - Paper feed mechanism - Google Patents

Abstract

PURPOSE:To prevent overlap feed of sheets by forming projections and recesses on a pad member in a direction crossing a sheet conveying direction so that the projections are directed toward a surface on which a sheet passes. CONSTITUTION:Upon conveyance of a sheet P, projections 10 and recesses 11 on a pad 9 allow the sheet P to wave in a direction crossing a sheet feed conveying direction so as to deal with sheets one by one. At this time, the sheet T is prevented from being excessively curved since a constant gap is present between the pad 9 and a paper feed roller 7. As a result, it is possible to prevent overlap feed of sheets P.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a paper feeding mechanism of a copying machine, a facsimile machine, etc., and particularly relates to an improvement in a structure for preventing double feeding of paper in a paper feeding mechanism.

BACKGROUND OF THE INVENTION Paper feeding mechanisms such as copying machines and facsimile machines are usually provided with a pad member and a torque limiter in addition to advance rollers and paper feeding rollers to prevent double feeding of sheets.

As pad members, there are known types such as friction pads, which are made of elastic material and come into contact with the paper feed roller, and comb-shaped pads that are arranged in a non-contact state with the paper feed roller.

Problems to be Solved by the Invention When using a friction pad or torque limiter to prevent double feeding of paper, since the friction pad or torque limiter is constantly in contact with the paper feed roller, problems such as longevity due to wear and tear may occur. It is necessary to solve problems such as generation of concrete noise due to contact.

On the other hand, with non-contact type comb-shaped pads, the above-mentioned problems do not need to be considered, but when feeding special paper such as OHP film, there is a problem that the special paper generates a chattering sound. .

Therefore, an object of the present invention is to provide a paper feeding mechanism that can feed paper well regardless of the type of paper using a non-contact pad member that has excellent wear resistance and does not generate abnormal noise. .

Means for Solving the Problems〉 The present invention provides a method for preventing heavy paper feeding. The pad member is provided upstream of the paper feed roller at a position that does not overlap with the paper feed roller when viewed from the side in the paper conveyance direction, and the pad member 4 is a paper feeding mechanism characterized in that unevenness is formed in a direction transverse to the paper conveyance direction, and at least the protrusion is arranged so as to protrude with respect to the paper passing surface.

Effect> The unevenness formed on the pad member forcibly waves the paper, so that the paper is separated one by one.

In addition, since the pad member is provided upstream of the paper feed roller at a position that does not overlap with the paper feed roller, the paper to be handled is curved more than necessary by the paper feed roller and the pad, and is subjected to forced straining. Never. Therefore, it is possible to eliminate the chattering sound of the paper during conveyance.

Embodiments FIG. 1 is a schematic side view showing the configuration of a paper feeding mechanism of a copying machine according to an embodiment of the present invention.

Moreover, FIG. 2 is an illustrative view of the mechanism of FIG. 1 viewed from a direction orthogonal to the conveying direction along line -H.

This paper feeding mechanism includes a paper table 1 on which paper P is set;
A forward feed roller 2 for feeding out the paper P set on the paper table 1, a leading edge regulation plate 3 for breaking the leading edge of the paper set on the paper table 1, and a sheet to be conveyed. It includes guide plates 4, 5.6 for guiding the paper, and a paper feed roller 7 for feeding the paper fed out by the advance reroller 2 into the interior.

In this embodiment, the tip regulating plate 3 and the guide plate 4 are integrally formed. In addition, the paper table 1 is provided so as to be able to swing up and down in FIG. It is designed to press into contact with the force of .

The paper feeding mechanism further includes a pad 9 attached to the mounting plate 8. The pad 9 is made of urethane rubber in this embodiment.

The features of this embodiment are: (1) The pad 9 is placed upstream of the paper feed roller 7 and does not overlap the paper feed roller 7 when viewed from the side in the paper conveyance direction, as shown in FIG. (2) As shown in FIG. 2, the pad 9 is a comb-shaped pad having a convex portion 0 and a concave portion 11 intersecting with each other in the paper conveyance direction. , at least the convex portion 10 is arranged so as to protrude from the paper passing surface T, as shown in FIG. Note that the convex portion 10 of the pad 9
In addition, the recess] 1 may also protrude from the paper passage T.

As a result of forming the pad 9 in this manner, when the paper is conveyed, the convex portions 10 and the concave portions 11 of the pad 9 cause the paper to wave in a direction transverse to the conveyance direction, and the paper can be separated one by one. Furthermore, since there is a certain gap between the pad and the paper feed roller 7, the paper does not curve more than necessary.

Therefore, even in the case of thin paper or thick paper that is not charged with static electricity such as OHP film, the river paper no longer generates chattering noise.

The paper feeding mechanism according to the present invention can be employed in various mechanisms for feeding paper into an apparatus. For example, the paper feed mechanism that takes in paper from the paper cassette in a copying machine, the paper feed mechanism that takes paper from the manual paper feed slot, and the paper feed mechanism that takes in paper set in the intermediate tray for refeeding. It can be adopted as a paper mechanism or a paper feed mechanism W in a facsimile machine.

Effects of the Invention Since the present invention is configured as described above, it is possible to provide a paper feeding mechanism that is excellent in durability and can reliably prevent double feeding of paper. In particular, even when feeding special paper such as OHP film or thick paper, it is possible to provide a paper feeding mechanism that can reliably prevent double feeding and does not generate rattling noise of the paper.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing the configuration of a paper feeding mechanism according to an embodiment of the present invention. 6 Diagram 2 is a diagram along line ■1■ in Figure 1. In the figure, 2. Advance roller, 3. Tip regulation plate, 7.
...Paper feed roller, 9...Pad, 1o...Protrusion,
11... Indicates a recessed portion. Patent Source Hito Mita Kogyo Co., Ltd.

Claims (1)

[Claims] 1. Feeder including pad member to prevent double feeding of paper A paper mechanism, The pad member is located upstream of the paper feed roller. Paper feed roller viewed from the side in the paper transport direction It is located in a position that does not overlap with the In addition, the pad member has a There are unevenness formed in the direction of the difference, and the Both protrusions protrude from the paper passing surface. It is characterized by being arranged so that paper feed mechanism.