JPS61280963A - Recording device - Google Patents

Abstract

PURPOSE:To put out at high-speed and a high-quality image by shifting a control member which controls moving directions of a recording medium, during the recording operation, to a position which is different from that of a recording medium mounting time to reduce the distance between the recording paper and the recording head. CONSTITUTION:A tip of a paper sheet 1' hits a bend 20' of a paper guide 20 and changes its course, being put between a paper-feeding roller 2 and a rubber roller 3. Then, the tip of the sheet 1' is detected by a photo sensor 21 to stop a paper-feeding pulse motor 4, and the paper sheet 1' stops. Then, a motor 18 turns about 180 deg. in an anticlockwise direction, supported by its control circuit. If the paper-feeding guide 20 is shifted from the position indicated with two dot lines to that of full lines by a rotary shaft 17 and an arm 19, printing is ready to be started. After printing of one sheet of paper, the paper-feeding pulse motor 4 rotates to put out the paper sheet 1'. Then, the sensor 21 detects that the paper sheet 1' is put out, and stops the pulse motor 4 and reversely turns the motor about 180 deg. in the clockwise direction to stop the paper-feeding guide 20 at its home position.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording device that records characters, images, etc. on a recording medium such as paper or film, and particularly relates to a recording device that uses a cut sheet-like recording medium as the recording medium. This paper relates to improvements to the paper feeding system of the device.

[Summary of the Disclosure] This specification and drawings describe a recording device that records characters, images, etc. on a recording medium such as paper or film. This invention discloses a technique for outputting high-quality images at high speed by including a regulating member that regulates the direction and a moving means that moves the regulating member to a different position during recording from when the recording medium is attached.

Note that this summary is provided solely for the purpose of quickly accessing the technical content of the present invention, and does not have any influence on the technical scope of the present invention or the interpretation of rights.

[Prior Art] Fig. 3 shows an example of an inkjet recording device that has been proposed in the past. A paper feed roller that is sandwiched together with the rubber roller 3 and sends it in the sub-scanning direction; 4 is a paper feed pulse motor that drives the upper paper feed roller 2 and the lower paper feed roller 6 via a belt 5; 7 is a paper feed pulse motor that drives the rad 8 for recording. This is the carriage that carries it. The carriage 7 is driven by a head feed motor 11 via a wire 9 and a pulley 10, and reciprocates in the main scanning direction along guide rails 12.13.

14 is an ink supply tube for supplying ink from an ink tank (not shown) to the recording pad 8, and 15 is a flexible wiring board for supplying drive pulses to each nozzle of the recording head 8. is a multi-nozzle jet head, for example, the nozzles are arranged linearly in the sub-scanning direction with a printing width of about 8s+s at an interval (pitch) of 1/m, and the nozzles are supplied via a flexible wiring board 15. The ink droplets are ejected from the nozzle toward the recording paper 1.For example, a heating element is embedded in the nozzle, and a bubble is generated by the heat generated by the pressure pulse. A bubble jet method in which ink droplets are ejected using air bubbles, an air flow method using a piezoelectric element, a diaphragm method using a diaphragm, etc. are used.

In a recording device having a multi-nozzle head as described above, the distance from the tip of each nozzle lined up in the sub-scanning direction to the recording paper is fixed, and the time it takes for an ink droplet to fly from each nozzle to the recording paper is determined. Since it is necessary to suppress variations as much as possible, we
It is necessary to maintain the flatness of the recording paper.

In other words, in normal printers such as impact printers that use type, printing is performed by placing recording paper in close contact with a cylindrical platen, but in the multi-nozzle head described above, printing is performed from each nozzle of the multi-nozzle head. Since the distance to the recording paper that is in close contact with the cylindrical platen changes continuously, when using a multi-nozzle head, place the recording paper l in a flat shape facing the recording head as shown in Figure 3. need to be supported. For this reason, in the conventional example shown in FIG. 3, the recording paper 1 is stretched by the upper paper feed roller 2 and the lower paper feed roller to form a flat part A that faces the recording head 8, and this flat part A is brought into close contact with a flat platen 1B.

By the way, when using a roll-shaped recording paper (hereinafter referred to as roll paper) as the recording paper 1 as described above, the leading end of the roll paper 1 is touched once between the upper paper feed roller 2 and the rubber roller 3. If you do this, there is no need to load the roll paper until the next time you replace the roll paper, so when replacing the roll paper, the operator must manually lift the leading edge of the roll paper upwards. This is generally done by sandwiching the paper between the paper feed roller 2 and the rubber roller 3. On the other hand, in the case of cut sheet-like recording paper (hereinafter referred to as cut paper) that has been cut in advance to a predetermined size such as A4 size or 84 size, the operator needs to If you do the operation of sandwiching the recording paper between the paper feed roller 2 and rubber roller 3,
Since the operation work is complicated and inconvenient, it is common to automatically or semi-automatically transport the recording paper to a desired position where printing is possible.

However, in the paper feeding mechanism that forms the flat part A as shown in the third @, when the cut paper is conveyed, the cut paper passes through the lower roller 8 and continues straight, and is not deposited in the flat part A. Therefore, the cut paper is moved from the lower roller 6 to the upper paper feed roller 2 so that the leading edge of the cut paper is sandwiched between the upper paper feed roller 2 and the rubber roller 3. , flat part A
It is necessary to provide a paper feed guide along the Such a paper feed guide is generally configured to hold the vicinity of both ends of the recording paper on which printing is not performed, using a thin metal plate with spring properties.

[Problems to be solved by the invention] However, the thickness of such a conventional paper feed guide is
Since the distance between the recording pad 8 and the recording paper cannot be less than this value, the landing accuracy of the ink droplets ejected from the nozzle is as follows: By narrowing the distance between the recording paper and the recording head, the quality of the image output on the recording paper can be improved. When performing general printing such as printing, it is sufficient to maintain a distance between the recording paper and the recording head of about 1 to 1.2 mm, but in order to obtain high-quality images such as photographic images, this recording The distance between the paper and the recording head is 0.3
It becomes necessary to reduce the value to about 0.4-■ or less. However, as mentioned above, when using a conventional paper feed guide, the distance between the paper and the print head must be set to 0 to avoid contact between the tip of the print head and the paper feed guide.
．． There was a problem in that it was not possible to reduce the number to less than 3 liters.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a recording apparatus that can eliminate the above-mentioned drawbacks and output high-quality images at high speed. - [Means for Solving the Problems] In order to achieve this object, the present invention provides a regulating member that regulates the conveying direction of the recording medium when the recording medium is mounted to convey the recording medium to a predetermined position where recording is possible; The present invention is characterized by comprising a moving means for moving the regulating member to a position different from that when the recording medium is mounted during recording.

[Function] In the present invention, when the recording medium is loaded, the recording medium is fed very smoothly along the conveyance path formed by the recording medium feeding guide as a regulating member stopped at a position facing the platen. In addition, during recording, the recording medium feeding guide is removed from the above-mentioned position when installed by the moving means, so recording can be performed even if the distance between the recording medium and the recording head is set to 0.3 lumen or less. There is no interference between the head and the recording medium feed guide, making it possible to output good, high-quality images.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an entire embodiment of the present invention, and FIG. 2 shows a side view of the embodiment during recording operation. In FIGS. 1 and 2, the same reference numerals as in the conventional example in FIG. shall represent. In FIG. 1, cut paper 1' as a recording medium is fed to a position where printing is possible, that is, to a position where the leading edge of cut paper 1' in the paper feeding direction is sandwiched between upper paper feed roller 2 and rubber roller 3. Here, 17 is a rotating shaft to which the shaft of a motor 1B as a reversible moving means is coaxially connected, and 18 is a flat paper guide 20 as a regulating member. The upper end of the paper guide 20, which is a pair of arms that transmit the rotation of the rotation shaft 17, is bent along the curved surface of the roller 2. Reference numeral 21 denotes a reflective optical sensor as a recording paper detecting means for detecting that the quad paper 1' has been fed to a printable position as shown in the figure, and 22 indicates a detection signal of this optical sensor 21, not shown. This is a signal line that transmits to the control circuit.

FIG. 2 shows the state during recording in the embodiment shown in FIG.

In FIG. 2, numerals 23 and 24 are an upper paper guide and a lower paper guide, respectively, which are disposed at the lower paper feeding position to guide the cut paper 1' to the lower roller 8.

The lower paper guide 24 has a curled portion 24 along the curved surface of the roller 8.
' have.

In the above configuration, first, as shown in FIG. 1, with the paper guide 20 covering the flat surface A of the recording paper (see FIG. 3), cut paper 1 is automatically fed from a paper cassette (not shown). ' is slid between the upper paper guide 23 and the lower paper guide 24 and the leading edge of the cut paper 1' is pushed between the lower inner roller 6 and the outer roller B' opposite this roller 8. The cut paper 1' is then fed further forward by rotating rollers 8.6'.

At the end of the lower paper guide 24, there is a curled part 24' that changes the paper feeding direction from horizontal to vertical, so the leading edge of the cut paper 1' that reaches this curled part 24 gradually changes its traveling direction. , the paper is eventually guided to the gap formed by the platen 1B and the paper guide 20 located at the chain line position in this figure.

The leading edge of the cut paper 1', which is conveyed vertically through this gap, then hits the bent part 20' of the paper guide 20, and the bent part 20' changes its course along the paper feed roller, causing the paper to It is sandwiched between the feed roller 2 and the rubber roller 3. After that, the tip of the cut paper 1' is connected to the optical sensor 2.
1, the sensor 21 is detected through the signal line 22.
Upon receiving the detection signal, the paper feed pulse motor 4 is stopped by a control circuit (not shown), and the cut paper 1' is thereby stopped.

Subsequently, the motor 18 rotates about 180' counterclockwise in FIG. 2 due to the support of its control circuit, and the rotation axis 17
When the paper feed guide 2o moves via the arm 1 from the position indicated by the two-dot chain line in the figure to the position indicated by the solid line, printing becomes possible. At this time, the paper feed guide 20 is already sufficiently far away from the platen 18, so it will not interfere with the recording head 8 that performs main scanning during printing.

When printing for one sheet is completed, the one-sheet feed pulse motor 4 rotates, and the cut sheet 1' is conveyed to a paper discharge tray (not shown) by the rotating paper feed roller 2. At this time, the sensor 21 detects the completion of conveyance of the cut paper 1', and in response to this detection signal, the above-mentioned control circuit stops the paper feed pulse motor 4, and rotates the motor 18 clockwise in FIG. The paper feed guide 20 is rotated 180° in the opposite direction and stopped at the original position shown in FIG. 1, and enters a state of waiting for the next printing.

In this embodiment described above, the paper feed guide 2 is attached to the shaft of the motor 18.
Although the shaft 17 of 0 is directly coupled, it becomes possible to use a smaller motor by coupling via a reduction gear head or a worm gear.

〔Effect of the invention〕

As explained above, according to the present invention, when a recording medium such as a recording paper is loaded, the recording medium is fed along the conveyance path formed by the recording medium feed guide stopped at a position facing the platen, so The recording medium is now fed smoothly, and the recording medium feeding guide is removed from the above-mentioned position when it is installed during recording, so the distance between the recording medium and the recording head can be kept below 0.3 wet layer. Also, there is no interference between the recording head and the recording medium feed guide, and it is possible to output a good high-quality image.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a side view thereof. FIG. 3 is a perspective view showing an example of a conventional inkjet recording apparatus. 1.1'...Recording paper (recording medium). 2.3, 8.8'...Roller, 4.11.18...Motor. 7... Carriage, 8... Recording head 18... Platen. 20... Paper feed guide (regulating member) 22... Optical sensor, 23... Upper paper guide. 24...Bottom paper guide. Figure 1: Real S Kiri - Surplus life cycle Figure 2

Claims (1)

[Scope of Claims] a) A regulating member that regulates the conveyance direction of the recording medium when the recording medium is mounted to transport the recording medium to a predetermined position where recording is possible; b) A regulating member that controls the conveying direction of the recording medium when the recording medium is mounted to a predetermined position where the recording medium can be recorded; 1. A recording device comprising a moving means for moving the recording device to a different position than the time.