JPS61238650A - Device for inverting and discharging recording paper sheet - Google Patents

Abstract

PURPOSE:To aim at preventing a paper jam during invert discharge of paper sheets and at also preventing an ink paper sheet from being wasted during normal discharge of the paper sheets, by setting the peripheral speed of an inverting and discharging roller to be higher than that of a paper discharge roller in accordance with the length of an added inverting path so that the discharging time of the paper sheet upon normal discharge is made to be equal to that upon invert discharge. CONSTITUTION:In order to perform the invert discharge of a recording paper sheet, an inverting and discharging device 20 is mounted on the paper discharge section of a thermal printer instead of a guide unit, and therefore, the recording paper is fed onto an inverting path B after passing through a discharging path A. In this arrangement the conveying force of an inverting and discharging roller 24 for the recording paper sheet is set such that it is greater than that of a paper discharge roller 15 but is less than the carriage force of a platen roller 9 so that the recording paper sheet is discharged by means of the roller 24 when the trailing end of the recording paper sheet has passed through between a thermal head 6 and the roller 9 after the leading end of the recording paper sheet reaches the roller 24. Thus, the time for invert discharge is made equal to that for the normal discharge, thereby, it is possible to prevent a paper jam due to a lack of the time for the invert discharge in the device 20, and to prevent an ink sheet from being wasted due to excessive a normal discharge time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a recording paper reversal and discharge device attached to a recording machine such as a thermal printer or an electrostatic copying machine.

(Prior art) When stacking the ejected recording papers as they are on the paper output tray in a conventional general recording machine, the arrangement order of the recording papers is opposite to the recording order, so page alignment is not performed after recording. However, it is complicated. To save this time,
For example, as shown in Japanese Utility Model Application Publication No. 58-41739, an outer guide guides the recording paper led out through a paper discharge roller consisting of a drive roller and a presser roller, which are numbered on one paper section of the recording machine. and inner guide, and this recording paper to the outside of the machine.
A recording paper reversing device equipped with a discharge roller that ejects the recording paper is removably and rotatably attached to the paper discharging section of the recording machine, and the recording paper is reversed through the reversing device to automatically align the pages. There are known things that have been made possible.

By the way, when the above recording paper reversing device is installed, the IJI exit path of the recording paper becomes longer, so if the recording paper reversal and ejection operation is controlled at the same timing as the normal ejection operation, the ejection of the recording paper can be completed. This will result in a paper jam within the reversing device. Therefore, two types of control circuits are installed in the recording machine, one for installing the above-mentioned reversing device to reversely eject the recording paper, and one for removing it and performing normal ejection, and control the recording machine at different timings. However, in this case, there is a problem that the structure becomes complicated. Also,
It may be possible to use one type of control circuit by configuring the control circuit to be controlled at the same timing as when performing the reverse discharge when performing normal discharge, but with this configuration, the reversing device can be removed. There is a problem that when performing normal ejection, the ejection time becomes too long, and the ink sheet is wound up more than necessary and is wasted.

(Object of the Invention) The present invention has been made to solve the above-mentioned problems, and is capable of controlling reverse ejection and normal ejection of recording paper at the same timing using one type of control circuit. Also, the recording paper is reversed so that the recording paper can be completely ejected without causing a paper jam in the recording paper reversing path during reverse ejection, and it also prevents ink sheets from being wasted during normal ejection. A discharge device is provided.

(Structure of the Invention) The present invention is a recording paper reversing and discharging device that is detachably attached to a paper discharging section of a recording machine, and is capable of reversing recording paper that has been led out via a paper discharging drive roller of the recording machine. a reversing path consisting of an outer guide and an inner guide that guide the reversing path, a reversing ejection roller provided at the tip of the reversing path, and a transmission mechanism that transmits the rotational force of the sheet ejection drive roller to the reversing ejecting roller. According to the length of the reversing path, the circumferential speed of the reversing and discharging roller is set faster than that of the sheet discharging drive roller.

With this configuration, the ejection speed when reversing recording paper is ejected is faster than when performing normal ejection by the addition of the reversing path, and the time required to eject the recording paper is set to be approximately the same. I try to do that.

(Embodiment) FIGS. 1 and 2 schematically show the configuration of a thermal printer as a recording machine equipped with a recording paper reversal discharge device according to the present invention. The body of the thermal printer is composed of an upper frame 1 and a lower frame 2. The lower frame 2 has a support shaft 4 for the roll-shaped ink sheet 3.
and a winding device 5 for winding up this ink sheet 3;
A thermal head 6 and a separation roller 7 are provided.

The upper frame 1 also includes an idle roller 8.8 for guiding the ink sheet 3 to the thermal head 6, a platen roller 9 facing the thermal head 6, and a paper feed cassette 11 containing recording paper 10 of a predetermined size. and paper output tray 1
2 and a tray unit 14 including a manual feed tray 13;
A paper discharge drive roller 15 is provided.

A feed roller 16 is provided above the paper feed cassette 11, and a compression spring 17 is provided within the paper feed cassette 11 to urge the recording paper 10 toward the feed roller 16. The recording paper 10 fed out from the paper feed cassette 11 is supplied between the thermal head 6 and the platen roller 9 via a paper feed path 18 consisting of upper and lower kite plates and a pair of upper and lower registration rollers 19. Then, by applying a heat pulse from the thermal head 6 to this portion, the ink on the ink sheet 3 is transferred to the recording paper, and recording is performed. Thereafter, the recording paper is separated from the ink sheet 3 by a separating roller 7, and if a reversing and discharging device 20 is attached to the paper discharging section of the upper frame 1, it is discharged to the outside of the machine via this.

As shown in FIG. 3, this reversing and ejecting device 20 has a
A reversing path B consisting of an outer guide 22 and an inner guide 23 that guides the recording paper led out through the ejection path A leading to the lead-out portion between the paper ejection drive roller 15 and the presser roller 21 while reversing it.
, a reversing discharge roller 24 provided opposite the tip of the outer guide 22, and a holding section 2 that holds the discharged recording paper.
5. The inverted U-shaped engagement groove 26 formed at the front end of the reversing and ejecting device 20 is engaged with the rotation support shaft 27 that is a rotational fulcrum and protrudes from the inner surface of the upper frame 1, whereby the reversing A discharge device 20 is detachably attached to the paper discharge section of the thermal printer and is rotatably rotatable about the rotation support shaft 27. Then, as shown in FIG. 4, by rotating the reversing and discharging device 20 in the direction of the arrow R1 about the rotation support shaft 27, the paper discharging section of the thermal printer is opened and the presser roller 21 is driven to discharge the paper. It is configured so that it can be separated from the roller 15.

The outer guide 22 is formed of a plate material that protrudes at predetermined intervals from the inner surface of a cover plate 29 that is rotatably attached around a pivot 28 at the base end. The cutout surface constitutes a guide surface for the recording paper. The outer guide 22 can be separated from the reversing discharge roller 24 and the inner guide 23 by rotating the cover plate 29 about the pivot shaft 28 in the direction of the arrow R2 to open it. In this state, paper jams occurring in the reversing path B can be easily removed. Further, a compression spring 30 is disposed below the pivot shaft 28 for urging the lower end of the cover plate 29 outward, and the urging force of the compression spring 30 causes the outer guide 22 to be rotated into a reverse discharge roller in a normal state. 24 and the inner guide 23. In addition, the presser roller 21
is attached to the inner guide 23 while being biased toward the paper ejection drive roller 15 via the leaf spring 31, and the presser roller 21 is pressed into engagement with the paper ejection drive roller 15 in a normal state.

Further, the reversing discharge roller 24 is connected to the paper discharge drive roller 15.
J: is configured to be rotationally driven by a transmission mechanism that transmits the rotational force of J:. That is, as shown in FIG.
A driven gear 33 that meshes with the reversing and discharging roller 20 is pivotally supported on the side end surface of the reversing and discharging device 20 , and a first sprocket 34 that is coaxially with the driven gear 33 is connected to the side end of the reversing and discharging roller 24 via a chain. The reversing and discharging roller 24 is rotationally driven by a transmission mechanism 36, which is connected to a second sprocket 35 provided in the second sprocket.

When the reversing and discharging device 20 is removed to perform normal discharging, as shown in FIG. to be installed in the state. Then, the recording paper is transferred from the recording section between the thermal head 6 and the platen roller 9 to the paper ejection drive D-ra 15 and the presser roller 3.
Paper ejection tray 1 passes through ejection path A leading to the outlet between
2 is discharged on top.

Further, when performing reverse ejection of recording paper, a reversal ejecting device 20 is attached to the paper ejecting section of the thermal printer in place of the guide unit 39, as shown in FIG. After passing through the discharge path A leading from the recording section to the lead-out section, the recording paper is supplied to a reversing path B consisting of an outer guide 22 and an inner guide 23, and the rear end of the recording paper is connected to the thermal head 6 and the platen. When the recording paper passes through the recording section between the recording paper and the roller 9, it is discharged onto the holding section 25 at a speed corresponding to the circumferential speed of the reversing discharge roller 24. That is, the conveying force of the recording paper by the reversing discharge roller 24 is set to be greater than the conveying force by the paper discharge drive roller 15 and smaller than the conveying force by the platen roller 9, so that the leading edge of the recording paper is reversely discharged. After reaching the roller 24 , the recording paper is discharged via the reversing discharge roller 24 when the rear end of the recording paper passes between the thermal head 6 and the platen roller 9 .

As described above, when the recording paper is reversely discharged, the length of the recording paper discharge path is extended by a length corresponding to the reverse path B compared to when the recording paper is normally discharged. Therefore, by setting the circumferential speed v1 of the reversing discharge roller 24 faster than the circumferential speed v2 of the paper ejection drive roller 15 according to the length of the reversing path B, the time required for performing the reversing discharge can be reduced. ,
The configuration is such that the time required for normal discharge is approximately the same.

That is, the time required for the trailing edge of the recording paper to pass through the reversing path B to the ejecting path when performing the reversing discharge is 11
If t2 is the time required for the trailing edge of the recording paper to pass through the ejection path A during normal ejection, these ejection times t1 and t2 are expressed by the following equations.

tl = (A+8)/v1 t2 = A/V2 The speed ratio of the circumferential velocities v1 and v2 necessary to set the ejection times t1 and t2 equal to each other is determined based on the formula shown below.

(A+B)/V1=A/V2 ,', V1 =V2 ・(A+8)/A In this way, the circumferential speed 1 of the reversing discharge roller 24 is changed to the paper discharge drive roller 15.
By setting the circumferential speed v2 to (A+8)/A times,
It is possible to equalize the ejection time when performing reverse ejection of recording paper and when performing normal ejection. Therefore, unlike conventional devices, there is no need to adopt a complicated configuration in which separate control circuits are used to perform reverse ejection of recording paper and normal ejection, and a single control circuit is used. Appropriate control is possible by

In other words, since the ejection time when performing the above-mentioned reverse ejection is equal to the ejection time when performing normal ejection, paper jams may occur in the reversal ejection device 20 due to insufficient ejection time during reversal ejection, or paper jams may occur in the reversal ejection device 20, or paper jams may occur in the reversal ejection device 20. It is possible to prevent the occurrence of situations where the ejection time is sometimes too long and the ink sheet is wound up more than necessary and wasted, and a single control circuit can perform both the above-mentioned reverse ejection and normal ejection. It can be controlled appropriately.

The circumferential speed (1) of the reversing discharge roller 24 can be set to a high speed by making the diameter of the reversing discharge roller 24 larger than the diameter of the paper discharge drive roller 15, and by setting the first circumferential speed of the transmission mechanism 36. There is a method of increasing the rotational speed of the reversing and discharging roller 24 compared to the rotational speed of the paper discharging drive roller 15 by varying the number of teeth of the second sprockets 34, 35, etc. Further, the reversing and discharging device 20 according to the present invention includes:
The present invention is not limited to the above-mentioned thermal printer, and can be used in a paper discharge section of an electrostatic copying machine, a laser beam printer, a facsimile machine, or the like.

(Effects of the Invention) As explained above, the present invention has the following advantages:
The recording paper is reversely discharged by making the peripheral speed of the reverse discharge roller installed at the tip of the reverse path faster than the peripheral speed of the paper discharge drive roller installed at the base end of the reverse path. The configuration is such that the time required for normal ejection is approximately equal to the time required for normal ejection, so that ejection of recording paper can be properly controlled with a simple configuration using a single control circuit. I can do it. In other words, there is no need to perform complicated control such as providing two types of control circuits and making the ejection time for reverse ejection of recording paper different from the ejection time for normal ejection as in the past. When performing reverse ejection of recording paper, it is possible to prevent paper jams from occurring due to the ejection operation ending with the recording paper remaining in the reversal ejection device, and to prevent paper jams from occurring when performing normal ejection. This has the advantage of preventing the material from being wound up and wasted. □

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a thermal printer equipped with a recording paper reversal discharge device according to the present invention, FIG. 2 is a sectional view of the thermal printer, and FIG. 3 is a sectional view showing essential parts of the present invention. 4 is a cross-sectional view showing the recording paper reversing path in an open state, FIG. 5 is a side view showing the drive section of the reversing ejection roller, and FIG. 6 is a cross-sectional view showing the reversing and ejecting device removed. be. 15... Paper discharge drive roller, 20... Reversing discharge device,
22...Outer guide, 23...Inner guide, 24...
Reversing discharge roller, 36... Transmission mechanism, B... Reversing path.

Claims (1)

[Claims] 1. A recording paper reversing and discharging device that is detachably attached to the paper discharging section of a recording machine, and includes an outer guide and an inner guide that guides the recording paper led out through the recording machine's paper discharging drive roller while reversing it. a reversing path consisting of a guide, a reversing discharge roller provided at the tip of the reversing path, and a transmission mechanism for transmitting the rotational force of the paper ejection driving roller to the reversing discharge roller, and the length of the reversing path 1. A reversing and discharging device for recording paper, characterized in that the circumferential speed of a reversing and discharging roller is set faster than that of a paper discharging drive roller.