JPH08197800A - Ink jet recording mechanism - Google Patents

Abstract

PURPOSE: To provide an ink jet recording mechanism using recording paper unrolled from a roll which requires only a small space for rewinding unrolled paper after recording ends so that the paper may not be left to curl. CONSTITUTION: When recording begins, an electromagnetic clutch 31 is turned on, recording paper is transported by a motor 91, and when the leading edge of the recording paper comes to the print position of an ink jet head 1, recording begins. During recording, when the remaining recording length of one page becomes L, the recording paper is cut by a cutter 31. After that, the electromagnetic clutch 31 is turned off, only the recording paper on the cut edge side is transported, and recording continues. At that time, paper on the roll 2 side is stationary. After recording ends and paper discharge end, the motor is rotated reversely and a curl removing function 5 is terminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording mechanism which uses an ink jet system as a recording system and uses a roll of recording paper.

[0002]

2. Description of the Related Art An ink jet recording mechanism using a conventional roll of paper as recording paper is disclosed in Technical Report 9
3 to 3265. This will be described with reference to the drawings. In FIG. 5, the recording paper pulled out from the roll 2 is the two shafts 5 of the curl removing mechanism 5.
Passing between 1 and 52, the biting roller 3 and the conveying roller 6
Is conveyed to the recording position of the inkjet head 1. The recording paper recorded by the inkjet head 1 is further ejected by the ejection roller 7. The two shafts 51 and 52 of the curl removing mechanism 5 are composed of a shaft 51 having a triangular cross section and a shaft 52 having a circular cross section, and are arranged above and below the recording paper.

During the recording operation, the shafts 51 and 52
Rotates about the midpoint of the two shafts.
As a result, the leading end side of the recording paper comes into contact with the apex of the triangle of the shaft 51, and the recording paper is squeezed to remove the curl of the recording paper. The shaft 52 is for increasing the wrapping angle of the recording paper around the shaft 51, and the roller 53 contacts the shaft 52 when the shafts 51, 52 have moved by a predetermined rotational movement amount or more, so that the roll paper 2 It is sandwiched between the shaft 52 and the shaft 52 to apply tension to the roll paper 2 to facilitate removal of the curl of the recording paper.

When recording is completed, the leading edge of the recording paper is conveyed to the position of the cutter 4 and cut. After that, the two shafts of the curl removing mechanism 5 are rotationally moved in opposite directions,
The recording paper is released, the discharge roller 7, the transport roller 6, and the bite roller 3 are reversed, and the recording paper is rewound until the leading edge of the recording paper comes to the position of the bite roller 3. The reason why the recording paper is rewound to the position of the bite roller 3 is to prevent the recording paper from being left unattended by the conveying roller 6 or the like.

Here, as a prior art, for example, Japanese Patent Laid-Open No.
Japanese Patent Laid-Open No. 9-20690 (hereinafter, referred to as Prior Art 1) describes a method in which a cut edge of paper is backed in a device configuration in which after printing paper is released from a crease, printed, cut by a cutter, and discharged outside the device. A "thermosensitive recording apparatus" is disclosed in which the waste of paper is reduced as much as possible by rewinding to the vicinity of the contact point between the roller and the recording head.

Further, Japanese Patent Laid-Open No. 3-7366 (hereinafter, referred to as
According to the prior art 2, when the printing of one page is completed, the sheet is cut into a predetermined size by the cutter unit, and then the transfer unit reciprocally transfers the unprinted print sheet by a predetermined amount, thereby the tension of the print sheet. There is disclosed a "printer" which eliminates the habit and prevents a crease.

[0007]

In the above-mentioned conventional ink jet recording mechanism, since the rewinding length of the recording paper is long, a large space is required for accommodating the rewound recording paper, and the apparatus becomes large. There are drawbacks.

The present invention has been made to solve the above problems, and an object of the present invention is to rewind the recording paper after the completion of recording so that the drawn recording paper does not have a habit of being left unattended. An object is to provide an ink jet recording mechanism that can be narrow.

Here, in both the prior art 1 and the prior art 2, the recording paper recorded after the recording on the recording paper is completed is cut by the cutter as in the conventional ink jet recording mechanism. A wide space is required to store the rewound recording paper.

[0010]

According to the first aspect of the present invention, in a recording mechanism using an ink jet recording head for recording ink by ejecting ink onto a recording paper pulled out from a roll, a recording paper conveying path is provided. A cutter disposed above the recording head and the roll for cutting the recording paper to a predetermined length, a curl removing mechanism for removing a curl of the recording paper, and a recording paper conveyance mechanism. An ink jet recording mechanism comprising: a biting roller arranged between the cutter and the curl removing mechanism; and a clutch capable of selectively switching the presence / absence of drive transmission between the biting roller and a drive source. can get.

According to the second aspect of the present invention, in a recording mechanism using an ink jet type recording head for recording ink by ejecting ink onto the recording paper pulled out from a roll, the recording head and the recording head are arranged on the recording paper conveyance path. A cutter disposed between the roll and for cutting the recording paper to a predetermined length, a curl removing mechanism for removing a curl of the recording paper, and the cutter and the curl remover for conveying the recording paper. A biting roller arranged between the biting mechanism, a first clutch capable of selectively switching the presence / absence of transmission of drive between the biting roller and a driving source, and a roller arranged below the roll to reverse the roll. And a second clutch capable of selectively switching the presence / absence of transmission of drive between the roll reverse roller and the drive source. Kujetto recording mechanism can be obtained.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1A is a sectional view showing the structure of an ink jet recording mechanism according to the first embodiment of the present invention.
(B) is a conceptual diagram showing a connected state of the drive system of the embodiment.

The roll 2 is placed in the recording paper storage section 21.
The recording paper pulled out from the roll 2 has a curl removing mechanism 5
Is passed through between the two shafts 51 and 52, and is guided to the biting roller 3. The cutter 4 is placed between the biting roller 3 and the conveying roller 6. The recording paper transportation path is U-shaped at the transportation roller 6.

The ink jet head 1 is of a shuttle type and has a plurality of ink ejection nozzles arranged in the sub-scanning direction, which are moved in the main scanning direction to eject ink in synchronism with the main scanning linear density for recording. I do. The inkjet head 1 is placed above the cutter 4, and the recording paper conveyance path is guided to the printing section of the inkjet head 1.
The cutter 4 is placed below the inkjet head 1 in order to prevent the paper dust generated when the recording paper is cut from adhering to the ink ejection portion of the inkjet head 1 or the like and degrading the recording image quality.

A discharge roller 7 is arranged behind the ink jet head 1 in the recording paper conveyance direction. A saw-tooth roller is generally used as the discharge roller 7. This is because the ink applied to the recording paper does not dry immediately so that the roller is prevented from rubbing the ink. Similarly, the reason why the cutter 4 is arranged in front of the inkjet head 1 is to prevent the blade of the cutter 4 from rubbing the ink.

As shown in FIG. 1B, the discharge rollers 7,
The conveying roller 6 and the biting roller 3 are connected to a recording sheet conveying motor 91 by a gear train 9. This time,
The bite roller 3 is connected to the gear train 9 by the electromagnetic clutch 31.
When the electromagnetic clutch 31 is energized (ON), the rotation of the recording paper conveyance motor 91 is transmitted to the biting roller 3.

The ink jet head 1 is driven in the main scanning direction by a drive motor 12 via a belt 11.

The curl removing function 5 is driven by an original motor 54, and the cutter 4 is also driven by an original motor 41.

Next, the operation of the ink jet recording mechanism shown in FIG. 1 will be described with reference to FIGS. 2 (a) and 2 (b). FIG. 2A shows the operation when recording a plurality of pages continuously, and FIG. 2B shows the operation when recording one page and ending.

In the standby state, the leading edge of the recording paper is located at the biting roller 3. When recording, first, the recording paper conveyance motor 91 is normally rotated (the direction in which each roller rotates in the direction of arrow A) to convey the leading end of the recording paper to the recording / printing position. At this time, the electromagnetic clutch 31 is on, and the bite roller 3 also rotates normally.

At the same time, the motor 54 is normally rotated to rotate the shafts 51 and 52 in the direction of arrow B about the midpoint of the two shafts. As a result, the leading end side of the recording paper comes into contact with the apex of the triangle of the shaft 51, and the recording paper is squeezed to remove the curl of the recording paper. The shaft 52 is for increasing the wrapping angle of the recording paper around the shaft 51, and the roller 53 contacts the shaft 52 when the shafts 51, 52 move by a predetermined rotational movement amount or more, and the recording paper is rotated. It is sandwiched between 52 and 52 to apply tension to the recording paper to facilitate removal of the curl of the recording paper. The rotational movement amount of the shafts 51 and 52 is changed to the optimum amount at that time by detecting the remaining amount of recording paper, temperature, humidity and the like (detection means is not shown).

When recording is started, the recording paper feeding motor 9
Reference numeral 1 conveys a recording sheet at a speed synchronized with the recording density of the inkjet head 1. When the remaining recording length of one page reaches the length L between the recording print position and the cutter 4, the motor 41 is driven to cut the recording paper. At this time, if the time for driving the cutter 4 is set shorter than the time during which the inkjet head 1 is moving in the main scanning direction, the recording paper is stopped, so that cutting failure such as diagonal cutting and cutting jam does not occur.

After cutting the recording paper, the electromagnetic clutch 31 is turned off. The recording paper conveyance motor 91 further conveys the recording paper at a speed synchronized with the recording speed of the inkjet head 1, and the inkjet head 1 continues recording.

After the recording is completed, the recording paper feeding motor 91 is further rotated in the forward direction, and the printed recording paper is ejected from the ejection roller 7. From the end of cutting the recording paper to the end of discharging the recording paper, since the electromagnetic clutch 31 is off, the bite roller 3 does not rotate and the leading edge of the recording paper on the next page is the cutter 4.
Has stopped at the position.

When the next page is recorded, the data shown in FIG.
As shown in, the electromagnetic clutch 31 is turned on, the recording paper conveyance motor 91 is rotated in the normal direction, the leading end of the recording paper is conveyed to the printing position, and the next page is recorded in the same manner.

When the recording operation is completed without recording the next page, as shown in FIG. 2 (b), the curl removing mechanism 5 does not allow the recording paper to be left unattended. 52 is rotationally moved in the direction opposite to the arrow B, returned to the initial position, the ironing of the recording paper is released, and the recording operation is ended. At this time, since the leading edge of the recording paper is stopped at the position of the cutter 4, if the recording paper path from the recording paper storage portion 21 to the position of the cutter 4 is straight, the recording paper does not have a habit of leaving.

FIG. 3A is a sectional view showing the structure of an ink jet recording mechanism according to the second embodiment of the present invention.
(B) is a conceptual diagram showing a connected state of the drive system of the embodiment. Components having the same functions as those in the first embodiment are designated by the same reference numerals, and only differences will be described below.

Recording paper roll reversing rollers 81 and 82 are arranged on the bottom surface of the recording paper housing portion 21, and the roll 2 is placed so as to be in contact with the roll reversing rollers 81 and 82. The roll reverse roller 81 is connected to the gear train 9 by an electromagnetic clutch 83. The other parts are the same as those in the first embodiment.

Next, the operation of the ink jet recording mechanism shown in FIG. 3 will be described with reference to FIGS. 4 (a) and 4 (b). FIG. 4A shows the operation when recording a plurality of pages continuously, and FIG. 4B shows the operation when recording one page and ending.

The operation from the standby state to the end of recording is the same as in the first embodiment. However, during this period, the electromagnetic clutch 81 is turned off, and the roll reversing rollers 81 and 82 rotate together with the rotation of the roll 2.

When the recording operation is completed without recording the next page, as shown in FIG. 4B, the curl removing mechanism 5 does not allow the recording paper to be left unattended. 52 is rotated in the opposite direction of arrow B, returned to the initial position, and the ironing of the recording paper is released. At the same time, the electromagnetic clutches 31 and 83 are turned on, and the recording paper conveyance motor 91 is rotated in the reverse direction. As a result, the leading edge of the recording paper is rewound toward the bite roller 3. Further, as the roll reversing roller 81 rotates, the roll 2 in contact therewith also rotates, so that the recording paper rewound by the biting roller 3 is taken up by the roll 2. When the leading edge of the recording paper reaches the position of the bite roller 3, the driving of the recording paper transport motor 91 is stopped and the operation is stopped. The discharge roller 7 and the transport roller 6 also rotate in the reverse direction, but at this time, since the recording paper of the previous page has been discharged, there is no problem even if the discharge roller 7 and the transport roller 6 rotate in the reverse direction. As a result, even if the recording paper path to the positions of the biting roller 3 and the cutter 4 is not straight, the recording paper does not have a habit of being left.

It is needless to say that the present invention is not limited to the above-mentioned embodiments, and that various modifications may be made without departing from the scope of the present invention.

[0034]

As described above, according to the present invention, good recording can be obtained by placing the recording paper cutter in front of the recording head and cutting the roll paper before recording or before the end of recording. Further, by stopping the drive of the biting roller by the electromagnetic clutch when it is unnecessary, the rewinding amount of the recording paper can be reduced. Further, by reversing the roll by the roll reversing roller and winding the rewound paper on the roll, the rewinding space can be eliminated.

[Brief description of drawings]

FIG. 1 is a diagram showing an inkjet recording mechanism according to a first embodiment of the present invention, in which (a) is a cross-sectional view showing its structure;
(B) is a conceptual diagram showing a connected state of the drive system of the embodiment.

2A and 2B are timing charts for explaining the operation of the inkjet recording mechanism shown in FIG. 1, in which FIG. 2A shows the operation when a plurality of pages are continuously recorded,
(B) shows an operation when recording one page and ending.

FIG. 3 is a diagram showing an inkjet recording mechanism according to a second embodiment of the present invention, in which (a) is a cross-sectional view showing its structure;
(B) is a conceptual diagram showing a connected state of the drive system of the embodiment.

4A and 4B are timing charts for explaining the operation of the inkjet recording mechanism shown in FIG. 3, in which FIG. 4A shows the operation when a plurality of pages are continuously recorded,
(B) shows an operation when recording one page and ending.

FIG. 5 is a cross-sectional view showing a conventional inkjet recording mechanism.

[Explanation of symbols]

 1 inkjet head 11 belt 12 drive motor 2 roll 3 biting roller 31 electromagnetic clutch 4 cutter 41 motor 5 curl removing mechanism 51 shaft 52 shaft 53 roller 54 motor 6 transport rotor 7 discharge roller 81 roll reverse roller 82 roll reverse roller 83 electromagnetic clutch 9 Gear train 91 Recording paper transport motor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B65H 23/34

Claims (2)

[Claims] 1. A recording mechanism using an ink jet recording head for ejecting ink onto a recording paper drawn from a roll and recording the recording paper, wherein the recording mechanism is arranged between the recording head and the roll on a recording paper conveyance path. A cutter that cuts the recording paper to a predetermined length, a curl removing mechanism that removes curl of the recording paper, and a bite that is arranged between the cutter and the curl removing mechanism on the recording paper conveyance. An inkjet recording mechanism comprising: a roller; and a clutch capable of selectively switching whether or not to transmit drive between the biting roller and a drive source. 2. A recording mechanism using an ink jet recording head for recording ink by ejecting ink onto a recording paper drawn from a roll, the recording mechanism being arranged between the recording head and the roll on a recording paper conveyance path. A cutter that cuts the recording paper to a predetermined length, a curl removing mechanism that removes curl of the recording paper, and a bite that is arranged between the cutter and the curl removing mechanism on the recording paper conveyance. A roller, a first clutch capable of selectively switching the presence / absence of transmission of drive between the biting roller and a drive source, a roll reversing roller arranged below the roll for reversing the roll, An ink jet recording mechanism, comprising: a second clutch capable of selectively switching the presence / absence of transmission of drive between a roll reversing roller and the drive source.