JPH0454979Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) This invention has a paper feed roller installed at a fixed position.
The present invention relates to a paper feeding device of the type that makes elastic contact with a friction pad provided on a support base to which spring pressure is applied, and separates and feeds paper sheets one by one using the paper feeding roller and the friction pad.

(Prior art) When conveying an OHP film in a friction separation paper feeding device using this kind of friction pad,
The coefficient of friction between the friction pad and the OHP film becomes extremely high, resulting in poor conveyance.

Therefore, in the case of transparencies, conventionally the friction pad pressure was released and the sheets were fed one by one. However, in this case, since the friction pad pressure is released, the feeding force of the paper feed roller is lost, causing problems such as non-feed jams.

Fig. 4 shows the state, in which 1 is a paper feed roller, 2 is a base, 3 is a compression coil spring, 4 is a support base attached to the tip of this spring 3, and 5 is installed on the support base 4. It is a friction pad that has been
Due to the elasticity of the spring 3, it is normally in pressure contact with the paper feed roller 1. Normal paper is separated one by one by the pressure of the friction pad, but in the case of OHP film, the coefficient of friction between the films is small, so the separation effect is reduced. Therefore, in order to release the friction pad pressure, the spring 3 is compressed and the friction pad 5 is separated by the paper feed roller 1.

(Purpose) The present invention was developed based on the above background, and its purpose is to stabilize the conveyance performance of OHP films in a friction separation paper feeding device using a friction pad.

(Structure) In order to achieve this objective, the present invention extends flexible guide plates on both sides of the friction pad in the paper width direction, and the guide plates move downward when pressure on the friction pad is released. When doing so, prevent this,
It is characterized by the arrangement of a blocking member that bends upward.

Hereinafter, one embodiment of the present invention will be described based on the drawings. Note that the same parts as in the conventional example are given the same reference numerals.

FIG. 1 is an external perspective view showing the main parts of a paper feeding device according to an embodiment of the present invention.

In the figure, reference numeral 7 designates blocking members provided on both sides of the friction pad 5, and 8 designates side pads. Flexible guide plates 9 are provided extending from both sides of the friction pad 5. This guide plate 9 is adapted to come into contact with the blocking member 7 when the friction pad 5 moves up and down.

FIG. 2 is a schematic diagram of the paper feeding device seen from the front, and this figure shows a state in which the friction pad 5 is in pressure contact with the paper feeding roller 1. FIG. 3 shows a state in which the friction pad pressure is released, that is, a state in which the support base 4 is moved downward against the pressure of the spring 3 and the friction pad 5 is separated from the paper feed roller 1. show. In this state, the guide plate 9 is prevented from moving in parallel by the blocking member 7, so that it bends upward as shown in the figure.

As mentioned above, when feeding an OHP film, the friction pad pressure is released, but in the paper feeding device according to the present invention, both ends of the guide plate 9 protrude upward in this way. , when an OHP film is fed, it becomes as shown in FIG.

As can be seen from this figure, since the OHP film 6 is pressed in the direction of the paper feed roller 1 by both ends of the guide plate 5, the conveyance force of the paper feed roller 1 is increased, and the conveyance performance can be stabilized.

The guide plate 9 is interposed below the friction pad 5 and between the support base 4 so as not to interfere with the separation of sheets by the friction pad 5.

FIGS. 6 and 7 are diagrams showing a specific mechanism for applying and releasing friction pad pressure.

In FIG. 6, the spring 3 is interposed between the cassette bottom plate 10 and the bracket 11 on which the paper bundle P is placed, and above the paper bundle P there is a pick-up roller 13 that swings about the paper feed roller shaft as a fulcrum. It is provided. 12 is the end fence of the paper bundle P;
The bracket is tilted counterclockwise around the bracket shaft 15, and the paper is moved in one direction of the paper feed roller.

The support base 4 is attached to the tip of the bracket 11, and since the bracket 11 is biased by the force of the spring 3 to rotate clockwise around the shaft 15, the friction pad 5 is pressed against the paper feed roller 1 to obtain friction pad pressure.

Reference numeral 14 designates a pressure release lever, which is rotated about a shaft 16 by lowering the release knob 17, as is clear from FIG. 7, and lifts the bracket 11 at its tip. As a result, the bracket 11 rotates counterclockwise about the shaft 15 against the force of the spring 3, thereby releasing the friction pad pressure.

(Effects) The present invention is as described above, and according to the frictional separation paper feeding device according to the present invention, even when the friction pad pressure is released when feeding an OHP film, the paper feeding roller can be used sufficiently. Conveying power can be obtained.

[Brief explanation of drawings]

Figure 1 is an external perspective view showing the main parts of a paper feeding device according to an embodiment of the present invention, Figure 2 is a front view of the same with pad pressure applied, and Figure 3 is the same with pad pressure released. Figure 4 is a front view showing the state in which OHP film is fed in a conventional paper feeder;
FIG. 5 is a front view showing a state in which an OHP film is fed in the paper feeding device of the present invention, FIG. 6 is a side view showing a specific example of the mechanism for applying and releasing friction pad pressure, and FIG. It is an external perspective view. DESCRIPTION OF SYMBOLS 1... Paper feed roller, 3... Spring, 4... Support stand, 5... Friction pad, 7... Blocking member, 9... Guide plate.

Claims (1)

[Scope of utility model registration request] A friction pad provided on a support base applied with spring pressure is brought into elastic contact with a paper feed roller provided at a fixed position, and the paper is separated into sheets one by one by this paper feed roller and friction pad. In a paper feeding device of the type that feeds paper, flexible guide plates are extended on both sides of the friction pad in the paper width direction, and when the guide plate moves downward when the friction pad pressure is released, A friction separation paper feeding device characterized by disposing a blocking member that prevents this and bends upward.