JPH0569955A - Paper sheet feed device - Google Patents

Abstract

PURPOSE:To maintain optimum pressure so as to prevent duplex feed or abnormal feed in feeding a paper sheet by providing a spring which is held with a holding part and pressure against a paper sheet loaded plate can be changed with it following to up/down movement of the holding part. CONSTITUTION:Under the condition in which a large sized paper sheet is loaded and a side guide 1 is brought outside (arrow mark (a) direction), a pinion 2 is rotationally moved in the arrow mark (c) direction with a rack part 1a. A pressure spring holding part 3 is moved upward (arrow mark (e) direction) through a screw part so as to raise pressure of a pressure spring 4. Meanwhile, under the condition in which a small sized paper sheet is loaded and the side guide 1 is brought inside (arrow mark (b) direction), the pinion 2 is rotationally moved in the arrow mark (d) direction with the rack part 1a, the pressure spring holding part 3 is moved downward (arrow mark (f) direction) through the screw part so as to lower pressure of the pressure spring 4. In this way, the pressure of the pressure spring 4 can be changed according to the size of the paper sheet, and contact pressure of a paper sheet loaded plate 5 against a paper feed roller 6 can be changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding mechanism in a terminal device or the like which uses cut sheets.

[0002]

2. Description of the Related Art Conventionally, this type of paper feeding mechanism has not been provided with a pressure changing mechanism of a pressure spring. That is, as an example thereof, as shown in FIG. 2, the side guide 11 has a rack portion 11a and a pinion 12 so as to move left and right in accordance with the sheet size, while the sheet stacking plate 5
Is pressed against the paper feed roller 6 by the pressure spring 14 to feed the paper. However, there is no relationship between the movement of the side guide 11 and the pressure spring 14, and the pressure spring 14 always presses the sheet stacking plate 5 with the same contact pressure.

[0003]

In the above-mentioned conventional paper feeding mechanism, the contact pressure is always the same, but the weight of the paper differs depending on the size, and there are the following problems.

(1) If the contact pressure to the paper feed roller is set in accordance with the maximum stackable sheet, double feed is likely to occur with the minimum stackable sheet.

(2) If the contact pressure is set to the minimum sheet, no feeding occurs in the maximum sheet.

(3) If both are satisfied, the type of paper is limited.

The present invention eliminates the above-mentioned conventional problems, and provides a paper feed mechanism in which the contact pressure can be changed according to the paper size even if the weight of each paper size is different.

[0008]

According to the present invention, there is provided a paper feed mechanism for a terminal device or the like in which a plurality of types of stackable paper can be selected, and a side guide having a rack portion and movable left and right according to the size of the paper. A pinion having a threaded portion in the center, which engages with the rack portion and rotates with the lateral movement of the side guide; and a support portion screwed with the threaded portion with the rotation of the pinion. And a spring that is held by the holding unit and that varies the pressure on the sheet stacking plate as the holding unit moves up and down.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, FIG. 1 (a) is a perspective view showing the configuration, and FIGS. 1 (b) and (c) are perspective views showing the operation of this embodiment.

The side guide 1 has a rack portion 1a and moves left and right according to the size of the paper. The pinion 2 has a threaded portion at the center, meshes with the rack portion 1 a, and rotates by the lateral movement from the side guide 1. The pressure spring holding portion 3 has a threaded portion on the lower end support portion, and is vertically moved by the rotation from the pinion 2. The pressure sprig 4 is held by the pressure spring holding portion 3, pushes up the sheet stacking plate 5, and brings the sheet stacking plate 5 into contact with the sheet feeding roller 6.

1B and 1C are operation diagrams of this embodiment. FIG. 1B shows a state in which large size sheets are stacked, the side guide 1 is moved outward (in the direction of arrow a), the pinion 2 is rotated in the direction of arrow c by the rack portion 1a, and the pin portion 2 is rotated through the screw portion. The pressure spring holding portion 3 is moved upward (in the direction of arrow e) to increase the pressure of the pressure spring 4. Figure 1
(C) is a side guide 1 on which small size sheets are stacked.
In the state of being moved inward (direction of arrow b), the pinion 2 is rotated in the direction of arrow d by the rack portion 1a, and the pressure spring holding portion 3 is moved downward (direction of arrow f) via the threaded portion. Reduce the pressure of spring 4. Thus, according to the present embodiment, the pressure spring 4 is
Can be varied, and the contact pressure of the sheet stacking plate 5 to the sheet feeding roller 6 can be changed.

[0013]

As described above, according to the present invention, the contact pressure to the paper feed roller is changed according to the size of the paper, so that the optimum pressure is always ensured, and the double feed at the time of feeding the paper is performed. It has the effect of preventing non-delivery.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 (a) is a perspective view showing the configuration, and FIGS. 1 (b) and (c) are perspective views showing the operation of the present embodiment.

FIG. 2 is a perspective view showing a configuration of a conventional paper feeding mechanism.

[Explanation of symbols]

 1,11 Side guide 2,12 Pinion 3 Pressure spring holding part 4,14 Pressure spring 5 Paper stacking plate 6 Paper feed roller

Claims (1)

[Claims] 1. In a paper feeding mechanism for a terminal device or the like in which a plurality of types of stackable paper can be selected, a side guide having a rack portion and movable left and right according to the size of the paper, and a screw portion at the center are provided. A holding portion that has a pinion that engages with the rack portion and that rotates as the side guide moves left and right, and a support portion that engages with the screw portion and that is vertically movable as the pinion rotates. And a spring that is held by the holding unit and that varies the pressure on the sheet stacking plate as the holding unit moves up and down.