JPH11115262A - Paper feed mechanism of printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately feed any of continuous sheets and single cut sheets. SOLUTION: In this paper feed mechanism of a printer, a push tractor 6 is arranged at one end of a paper transfer straight path constituted of a platen roller 3 and paper feed rollers 1, 12 before and after the platen roller. When a single cut sheet is to be sent, the push tractor 6 is retreated to under the path. When a continuous sheet S1 is to be sent, the push tractor is positioned to be even with the path. Accordingly, any of the sheets can be transferred with good pitch accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a paper feed mechanism for a printer.

[0002]

2. Description of the Related Art In a printer capable of writing a required record on a cut sheet and a continuous sheet, since a paper feed unit is usually arranged vertically, a recording operation is performed from a paper feed unit. The paper transport path that reaches the paper output section through the paper transport section must have a curvature, so that the load on the paper transport path may reduce the accuracy of the paper feed pitch, or the paper may float due to stiffness. This causes inconvenience that recording and writing are hindered.

In order to solve such a problem, the apparatus disclosed by the present applicant in Japanese Patent Laid-Open Publication No. Hei 3-1966 rotates a single unit member at one end of a linear paper feed path leading to a recording / writing section. The apparatus is freely mounted so that a required one of a plurality of paper feed mechanisms provided in the unit member and directed to a pivot point can be linearly connected to one end of a paper feed path. Although the method has the advantage that the required paper can be accurately conveyed from the paper feeding section to the recording / writing section, it leaves room for further improvement in that the paper conveying mechanism is unnecessarily increased in size.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem.
It is an object of the present invention to provide a new printer capable of accurately transporting a single sheet of paper or continuous paper with a small load without increasing the size of the apparatus.

[0005]

That is, according to the present invention, as a paper feed mechanism of a printer for achieving the above object, there is provided a paper feed mechanism comprising a platen and paper feed rollers disposed before and after the platen. A cut sheet feeding section is provided at one end of the paper transport path, and at the other end of the paper transport path,
A push tractor is provided to be rotatable and displaceable at a position on the same plane as the paper transport path when feeding continuous paper, and at a position retracted from the paper transport path when feeding cut sheet paper. In addition, regardless of the type of cut sheets, they can be conveyed accurately with a slight load.

[0006]

Embodiments of the present invention will be described below. The drawings relate to an embodiment of the present invention, which is shown with each paper feeding state of continuous paper and cut paper.

In FIG. 1, reference numeral 1 denotes a paper feed roller disposed at one end of the paper transport path so as to form a linear paper path, that is, at the left end of the figure. In this case, the sheet rotates in the clockwise direction in the figure, and feeds the cut sheet S2 from the sheet cassette (not shown) to the recording writing section, that is, the platen 3 and the recording head 4 in cooperation with the driven roller 13, and At the time of feeding, it is configured to rotate counterclockwise in the figure and discharge the recorded continuous paper S1 outside the machine.

On the other hand, reference numeral 6 in the figure denotes a push tractor disposed at the other end of the paper transport path, that is, at the right end in the figure.
The push tractor 6 is rotatably locked at a horizontal position with the roller shaft 7 near the platen 3 as a fulcrum so that the transport surface forms a linear transport surface identical to the paper transport path during continuous paper feed. When the cut sheet is fed, the cut sheet S
By operating a release lever or the like to rotate the push tractor 6 clockwise in the figure so as not to hinder the discharge of the sheet 2, the push tractor 6 is moved downward from the straight paper transport path as shown in FIG. It is configured to be evacuated.

Reference numeral 10 in the figure denotes a stepping motor for driving the paper feed rollers 1 and 12 before and after the platen roller 3 and the push tractor 6 via a series of driving force transmission trains 11. The driven roller 13 interposed between the platen roller 3 and the push tractor 6 is separated from the paired paper feed roller 12 at the time of continuous paper feeding so as not to hinder the feeding of the continuous paper S1. It is configured.

In the embodiment constructed as described above, when recording and writing on the continuous paper S1, the release tractor 6 is operated to rotate the push tractor 6 in the horizontal direction as shown in FIG. The paper feed rollers 1 and 12 are switched so as to rotate in the counterclockwise direction in FIG.

As a result, the continuous paper S1 is fed by the push tractor 6 on the linear paper transport path with a slight load with high pitch accuracy, and a high-quality recorded image is written on the surface. .

On the other hand, when performing recording and writing on a cut sheet, the push tractor 6 is rotated clockwise in the figure by operating a release lever or the like to rotate the push tractor 6 around the roller shaft 7 near the platen roller 3 as a fulcrum. As shown in FIG. 2, this is retracted below the linear paper transport path.

As a result, the cut sheet S2 fed from one end of the paper transport path and subjected to the recording and writing process passes through the push tractor 6 and is discharged onto a discharge tray (not shown) without resistance.

[0014]

As described above, according to the present invention, the push tractor is pivotally displaceable at one end of the linear paper transport path at a position flush with the paper transport path and at a retracted position. By simply rotating the push tractor to one of them, it is possible to transport them along a straight transport path regardless of whether they are cut sheets or continuous paper with high pitch accuracy. At the same time, it is possible to write a good recorded image while suppressing the floating of the paper.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an apparatus showing an embodiment of the present invention in a state of feeding continuous paper.

FIG. 2 is a configuration diagram of an apparatus showing an embodiment of the present invention in a cut sheet feeding state.

[Explanation of symbols]

 1, 12 Paper feed roller 3 Platen 6 Push tractor 7 Roller shaft

Claims (1)

[Claims] 1. A cut sheet feeding section is provided at one end of a linear paper transport path formed by a platen and paper feed rollers disposed before and after the platen. At the end, a push tractor is disposed so that it can be rotated and displaced at a position that is flush with the above-mentioned paper transport path when continuous paper is fed, and at a position that retreats from the above-mentioned paper transport path when feeding cut sheet paper. A paper feed mechanism for a printer.