JPH06293166A - Roller in paper feeder - Google Patents

Abstract

PURPOSE:To carry out a stable paper feed by pressing paper against a platen with a constantly ideal pressure by a plurality of bail rollers. CONSTITUTION:A bail roller 15 presses paper 12 against a platen 11 through a bail arm 13 and a bail shaft 16 by a bail spring 17. At that time, the two or more bail rollers 15 can always uniformly press the paper 12 by the elastic deformation of an elastic member 15b in each of the bail rollers 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller of a paper feeding device such as a dot printer or a typewriter.

[0002]

2. Description of the Related Art In printers and typewriters, stable conveyance of various sheets is an important quality issue.

A conventional paper feeding device will be described below. FIG. 4 is a perspective view of a conventional paper feeding device, in which 1 is a platen, 2 is a sheet, 3 is a bail arm, 4 is a bail support shaft, 5 is a bail roller, 6 is a bail shaft,
7 is a bail spring.

The function of the conventional paper feeding device configured as described above will be described below. A sheet 2 is wound around the platen 1, and the sheet 2 is pressed against the platen 1 by a plurality of bail rollers 5. The bail arm 3 is pivotally attached to the bail support shaft 4. The bail arm 3 heats the bail shaft 6 against the platen 1 by the bail spring 7, and the bail roller 5 pivotally supported by the bail shaft 6 presses the sheet 2 against the platen 1.

[0005]

However, in the above-mentioned conventional configuration, the pressing force of the bail roller 5 pressing the sheet 2 against the platen 1 is often different between the left and right, so the sheet 2 skews with respect to the initial setting position. Sometimes.
Further, the pressing force is small as a whole, and when the external force such as pulling the paper 2 is applied, the side having the smaller pressing force is the paper 2
May be shifted to the pulling force side of. In the case of the structure shown in FIG. 4, the force applied to the entire bail roller 5 is
It is calculated by the displacement amount of the two bail springs 7. The idea is to evenly distribute this by the number of bail rollers 5 and press the paper 2, but in reality, the parts formed by the bail shaft 6, the bail arm 3, and the bail support shaft 4 are twisted, and the left and right springs are Since the force is not uniform, the pressing force of each bail roller 5 is not constant. If the spring force is increased to increase the pressing force or the leverage is changed, the bail shaft 6
However, there is a problem that the bail roller 5 located at the center due to the bending of the blade does not function.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, in which the inside of the bail roller is made of an elastic member.

[0007]

With the above-mentioned structure, the bail roller 15 is used for the sheet 12.
The elastic member 15b in the bail roller elastically deforms when pressing the platen 11 against the platen 11, so that the bail roller 15 itself corrects the positional deviation such as the distortion of the component parts to which the bail roller 15 is attached. The bail roller 15 is capable of providing good pressing force.

[0008]

1 is a perspective view of a paper feeding apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view of the paper feeding apparatus according to an embodiment of the present invention. 11 is a platen, 12 is paper,
Reference numeral 13 is a bail arm, 14 is a bail support shaft, 15 is a bail roller, 16 is a bail shaft, and 17 is a bail spring. FIG. 3 is a sectional view of the bail roller 15 according to the embodiment of the present invention, in which 15a and 15c are resin cylinders,
15b is an elastic member.

The function of the roller of the paper feeding apparatus of the present invention configured as described above will be described below.

The bail arm 13 is urged toward the platen 11 by the bail spring 17, the bail shaft 16 is urged against the platen 1 by the bail arm 13, and the bail roller 15 pivotally supported by the bail shaft 16 forms a sheet. The function of pressing 12 to the platen 11 is the same as the conventional one.

For example, assuming that the urging force of the bail spring 17 is not equal to the left and right, the resin cylinders 15c inside the left and right bail rollers 15 receive different pressing urging forces from the bail shaft 16. However, since the elastic member 15b filled between the inner and outer resin cylinders 15a and 15c elastically deforms and absorbs the difference in urging force corresponding to different pressing urging forces, the outer resin cylinder 15a is The force pressing the paper 12 is evenly maintained by any of the bail rollers 15.

[0012]

According to the present invention, a plurality of bail rollers can always press the sheet against the platen with a uniform pressure, and a stable sheet feeding roller can be provided.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a paper feeding device according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a bail roller of a paper feeding device according to an embodiment of the present invention.

FIG. 4 is a perspective view of a conventional paper feeding device.

[Explanation of symbols]

 1,11 Platen 2,12 Paper 3,13 Bail Arm 4,14 Bail Spindle 5,15 Bail Roller 6,16 Bail Shaft 7,17 Bail Spring 15a, 15c Resin Cylinder 15b Elastic Member

Claims (2)

[Claims] 1. A roller for a paper feeding device comprising a platen and a roller for pressing a paper against the platen, wherein an inner thick portion of the roller is made of an elastic member. 2. The roller has an inner cylindrical member and an outer cylindrical member that are coaxial with each other, and an elastic member is filled in an inner thick portion of the roller sandwiched between the inner cylindrical member and the outer cylindrical member. The roller of the paper feeding device according to claim 1.