JPH04354758A - Recording medium transport device - Google Patents

Abstract

PURPOSE:To certainly exhaust the marginal piece which is cut away from a recording sheet of paper 11 under running. CONSTITUTION:An endless belt 16 is set over a sheet feeding pinch roller 5, which is pressed to a feed roller 3 in the margin cutting position, and a margin exhausting pinch roller 15 installed understream and pressed to a margin exhaust roller 8A, and the leading edge of the cut margine 12 is guided by this endless belt 16.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a device for conveying sheet-like recording media (hereinafter referred to as recording paper), and in particular, the present invention relates to a device for conveying sheet-like recording media (hereinafter referred to as recording paper), and in particular, the present invention relates to a device for conveying a sheet-like recording medium (hereinafter referred to as recording paper), and in particular, the present invention relates to a device for conveying a sheet-like recording medium (hereinafter referred to as recording paper), and in particular, the present invention relates to a device for conveying a sheet-like recording medium (hereinafter referred to as recording paper). The present invention relates to a recording medium transport device for transporting a recording medium.

0002

2. Description of the Related Art Conventionally, in a recording apparatus such as an electrostatic plotter, unnecessary portions (edge paper) on the side edges of recording paper are cut off and discharged while running the recording paper after recording. As shown in FIG. 6, the conventional device used for cutting and discharging the edge paper consists of a paper feed shaft 1 connected to a drive source (not shown), and a paper feed fixed to the paper feed shaft 1. paper roller 2
and a paper feed roller 3 that also serves as a lower blade for cutting the recording paper, an upper blade 4 that cuts the recording paper in cooperation with the paper feed roller 3, and a rotatable paper feed pinch pressed against the paper feed roller 3. a roller 5, a paper ejection shaft 6 disposed downstream of the paper feed shaft 1 and connected to a drive source, and a paper ejection roller 7 fixed to the paper ejection shaft 6.
The recording paper has an edge paper discharge roller 8, a rotatable edge paper discharge pinch roller 9 pressed against the edge paper discharge roller 8, a guide plate 10, etc., and the recording paper runs in the direction shown by arrow A. 11 is cut off by the paper feed roller 3 and the upper blade 4 to produce a selvage paper 12, and the selvage paper 12 is discharged to the outside of the apparatus by the selvage paper discharge roller 8 and the selvage paper discharge pinch roller 9. was. In addition, in the figure, 13 is a regular cut paper from which the edge paper is cut away.

0003

However, with this configuration, there is a problem that slack occurs in the edge paper 12 between the paper feed roller 3 and the edge paper discharge roller 8, resulting in a paper jam. Ta.

[0004] The above problem arises for the following reasons. That is, the edge paper 12 cut by the paper feed roller 3 and the upper blade 4 is not restrained at all until its leading edge is restrained by the downstream edge paper discharge roller 8 and the edge paper discharge pinch roller 9. Since the selvage paper is narrow in width, it does not have much rigidity on its own. Therefore, the paper feed roller 3 and paper feed pinch roller 5
Even if conveying force is applied to 2, the tip is not conveyed well,
Further, even if the tip reaches the position between the edge paper discharge roller 8 and the edge paper discharge pinch roller 9, it does not easily enter between them.

The present invention has been made in view of the above-mentioned problems, and it is possible to convey thin recording paper such as paper without causing any slack even when conveying it. The purpose is to provide a recording medium conveying device that can

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a paper feed pinch roller that is pressed against the paper feed roller at the edge paper cutting position, and a edge paper discharge roller that is disposed downstream of the paper feed pinch roller. An endless belt is wrapped around the pressed edge paper ejection pinch roller, and the end of the edge paper is guided by the endless belt.

Here, it is preferable that the circumferential speed of the edge paper discharge roller and the edge paper discharge pinch roller pressed against it be greater than the circumferential speed of the paper feed roller and the paper feed pinch roller pressed against it.

[0008]

[Operation] Since the present invention has the above-described structure, the tip of the cut paper that has been cut and sent out by the paper feed roller and the paper feed pinch roller is guided by the endless belt, and smoothly passes between the paper feed roller and the paper pinch roller and the paper feed pinch roller. The paper is caught between the rollers, which stabilizes the conveyance of the paper and prevents paper jams.

Here, if the circumferential speed of the edge paper ejection roller and the edge paper ejection pinch roller pressed against it is made larger than the circumferential speed of the paper feed roller and the paper feed pinch roller pressed against it, the paper feed roller and Even if the leading edge of the selvedge paper that is fed out from between the paper feed pinch rollers becomes slack before it is caught between the selvage paper ejection roller and the selvedge paper ejection pinch roller, the sag paper ejection roller and the selvedge paper ejection pinch roller When the paper starts to be conveyed, the slack can be taken up and stable paper conveyance becomes possible.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view of a recording medium conveying device according to an embodiment of the present invention, and the same members as those in the conventional example shown in FIG. 6 are denoted by the same reference numerals. In Figure 1, 1
is a paper feed shaft connected to a drive source (not shown) such as a motor,
2 is a paper feed roller fixed to the paper feed shaft 1; 3 is a roller fixed to the paper feed shaft 1 so as to convey the portion of the recording paper 11 that will become the edge paper 12; and 3 is a roller for cutting the recording paper 11. A paper feed roller that also serves as a lower blade, 4 an upper blade that cuts the recording paper in cooperation with the paper feed roller 3, 5 a rotatable paper feed pinch roller pressed against the paper feed roller 3, and 6 a paper feed roller. A paper ejection shaft arranged downstream of the shaft 1 and connected to a drive source, 7 a paper ejection roller fixed to the paper ejection shaft 6, and 8A a paper ejection roller provided at a position for conveying the selvedge paper 12. and is rotatably held on the paper discharge shaft 6. Reference numeral 15 denotes a rotatable selvage paper ejection pinch roller pressed against this selvage paper ejection roller 8A, and has a groove 15a in the center (see FIG. 2). Reference numeral 16 denotes an endless belt that is stretched around the edge paper discharge roller 15 and the paper feed pinch roller 5, and is looped around the edge paper discharge roller 15 in its groove 15a. As shown in FIG. 3, upstream of the paper feed shaft 1 is a cutter 1 that cuts the recording paper 11 in the width direction.
7 is provided. A drive source (not shown) that rotationally drives the paper feed shaft 1 and the paper ejection shaft 6 drives the paper feed rollers 2 and 3 and the paper ejection roller 7 at a circumferential speed V1 of the paper feed rollers 2 and 3 and the paper ejection roller 7. The recording paper 11 is driven at a speed equal to or greater than the velocity V0 of the recording paper 11 (that is, V0≦V1), and is configured to slip when a torque exceeding a predetermined value is applied. In addition, in Figure 1, 1
0 is a guide plate, and 13 is a regular cut paper.

The operation of the recording medium conveying device configured as described above will be explained below. As shown in FIG. 3, before the recording paper 11 reaches the paper feed roller 3, the paper feed roller 3 and the paper feed pinch roller 5 pressed against it are rotating at a peripheral speed V1, and the belt 16 is also rotated. same speed V
It is running at 1. Therefore, the edge paper discharge pinch roller 15
is driven by the belt 16, and its circumferential speed V2 is lower than the belt speed V1 because the belt 16 is hung in the groove 15a.
(ie, V1<V2). Furthermore, the edge paper discharge roller 8A is also rotating at the same circumferential speed V2 as the edge paper discharge pinch roller 15.

In this state, when the recording paper 11 is fed at a speed V0 by a paper feeding device (not shown) and its leading edge is fed onto the paper feeding rollers 2 and 3, the paper is fed as shown in FIG. The speeds of the paper roller 3, paper feed pinch roller 5, belt 16, etc. become equal to the speed of the recording paper 11, and the recording paper 11 is further conveyed downstream. At the same time, the paper feed roller 3, which also serves as the lower blade, and the upper blade 4 (
(see FIG. 1), the side edge portion of the recording paper 11 is cut,
This becomes the ear paper 12. After the leading edge of the edge paper 12 is ejected from between the paper feed roller 3 and the paper feed pinch roller 5, it is guided by a belt 16 running at the same speed as the recording paper, and is connected to the edge paper discharge roller 8A downstream. The paper is fed between the pinch rollers 15, conveyed further downstream by the edge paper discharge roller 8A and the edge paper discharge pinch roller 15, and is discharged from the apparatus. Here, since the belt 16 guides the edge of the edge paper, even if the edge paper 12 is thin and has no rigidity, it will be reliably fed between the edge paper discharge roller 8A and the edge paper discharge pinch roller 15, and the paper will be jammed. will not occur. Furthermore, since the selvedge paper discharge roller 8A and the selvedge paper discharge pinch roller 15 rotate at a peripheral speed V3 that is faster than the circumferential speed V0 of the upstream paper feed roller 3 and paper feed pinch roller 5, Even if slack occurs before the leading end is sandwiched between the edge paper discharge roller 8A and the edge paper discharge pinch roller 15, the slack is absorbed and the edge paper 12 is conveyed while being given an appropriate tension. In this way, the selvage paper 12 can be smoothly ejected without causing a paper jam. Note that the ratio of the circumferential speeds of the paper feed pinch roller 5 and the edge paper discharge pinch roller 15 is determined so that an appropriate tension can be applied to the edge paper 12. It can be adjusted by changing the depth of 15a.

[0013] When the recording paper 11 is conveyed to a predetermined position, the cutter 17 is operated to cut off the recording paper. Thereafter, the circumferential speed of the paper feed roller 3 becomes V1 as shown in FIG. 3, and the separated portion is discharged at a higher speed than the speed V0 of the upstream recording paper 11.

In the above embodiment, the belt 16 is applied only to the paper feed pinch roller 5 and the edge paper discharge pinch roller 15, but as shown in FIG. A belt roller 18 may also be provided and the belt roller 18 may also be hooked. When such a belt roller 18 is provided, the belt 16 extending between the edge paper discharge pinch roller 15 and the belt roller 18 acts as an upper guide for the edge paper, and prevents the edge paper from being caught in the edge paper discharge pinch roller 15. can.

[0015]

Effects of the Invention As is clear from the above description, the present invention provides a paper feed pinch roller that is pressed against the paper feed roller at the edge paper cutting position, and a pinch roller that is pressed against the edge paper discharge roller located downstream of the paper feed pinch roller. An endless belt is placed around the paper ejection pinch roller, and the endless belt guides the edge of the edged paper, so that the edge of the edged paper that is cut and fed out by the paper feed roller and the paper feed pinch roller is endless. It is guided by a belt and is smoothly caught between the edge paper discharge roller and the edge paper discharge pinch roller, which has the effect of stabilizing the conveyance of the edge paper and preventing paper jams.

Note that if the circumferential speed of the edge paper ejection roller and the edge paper ejection pinch roller pressed against it is set higher than the circumferential speed of the paper feed roller and the paper feed pinch roller pressed against it, the paper feed roller and the paper feed Even if the leading edge of the selvage paper that is fed out from between the paper pinch roller and the sag paper is sagged until it is caught between the selvage paper ejection roller and the selvage paper ejection pinch roller, the sag paper ejection roller and the selvage paper ejection pinch roller When the operator starts transporting the selvedge paper, the slack can be taken up and the sag paper can be transported stably.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a recording medium transport device according to an embodiment of the present invention.

[Fig. 2] A perspective view showing the selvedge paper ejection roller and the selvedge paper ejection pinch roller in the above embodiment.

FIG. 3 is a schematic cross-sectional view showing the state before the recording paper is fed to the paper feed roller and the paper feed pinch roller in the above embodiment.

[
FIG. 4 is a schematic cross-sectional view showing the state after the recording paper is fed to the paper feed roller and the paper feed pinch roller in the above embodiment.

FIG. 5 is a schematic sectional view of the same part as FIG. 4 showing another embodiment of the present invention.

[Fig. 6] Schematic perspective view of a conventional device

[Explanation of symbols]

1 Paper feed shaft 2 Paper feed roller 3 Paper feed roller (lower blade) 4 Upper blade 5 Paper feed pinch roller 6 Paper ejection shaft 7 Paper ejection roller 8, 8A Slip paper discharge roller 10 Guide plate 11 Recording paper 12　Slip paper 13　Standard cut paper 15　Slip paper discharge pinch roller 15a Groove 16 Endless belt 17 Cutter 18 Belt roller

Claims (2)

[Claims] Claim 1: A paper feed roller disposed at the edge paper cutting position, a paper feed pinch roller pressed against the paper feed roller, an edge paper ejection roller disposed downstream thereof, and the edge paper ejection roller. A pressed paper ejection pinch roller,
A recording medium conveyance device including an endless belt that is stretched around the paper feed pinch roller and the edge paper discharge pinch roller and guides the edge paper. 2. Claim 1, wherein the circumferential speed of the edge paper discharge roller and the edge paper discharge pinch roller pressed against it is set higher than the circumferential speed of the paper feed roller and the paper feed pinch roller pressed against it. The recording medium transport device described above.