JPH08277051A - Recording device - Google Patents

Abstract

PURPOSE: To excellently discharge the paper by changing the carrying speed of the paper relative to the carrying speed during the recording before the rear end of the paper is discharged from a sheet discharging means after completion of recording. CONSTITUTION: A main carrying roller 15 is driven by a carrying motor to regulate the recording surface of the recording paper 41 and carry the sheet during the recording. A spur 27 is turnably and pivotably supported by a guide rail, and regulates the position of the recording surface of the paper 41. Paper discharging rollers 29A, 29B discharge the recording paper 41 toward a paper discharge port, and are integratedly formed of the ABS resin and the elastomer, and arranged at the position opposite to the spur 27, and energized in the direction of the spur 27 by a spring. The amount of carriage for the unit drive quantity of a paper carrying motor of the paper discharging rollers 29A, 29B is larger than that of the carrying roller 15. The paper 41 is discharged by increasing the speed after e.g. the printing instruction is completed according to the position of the rear end of the recording paper 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device.

[0002]

2. Description of the Related Art In a conventional recording apparatus, when recording data is recorded on a recording sheet and then discharged onto a desk or a discharge tray or the like, a knurl is formed on a discharge roller to improve dischargeability. In many cases, mechanical improvements were made. The purpose of this is to surely eject the trailing edge of the paper to the outside of the recording device by the knurling, and the effect was great.

[0003]

However, in recent years, in which various transport systems are used, such as horizontal transport, which provides good transport performance regardless of the type of paper, knurls do not always provide sufficient effects. ing.

For example, in a recording apparatus having a horizontal transport mechanism, the state of the trailing edge of the sheet at the time of discharging is not necessarily biased by the discharging means, so that the rigidity of the sheet is lowered and buckling occurs in a high humidity environment. If it becomes easy, it is not possible to secure sufficient discharge performance with only the knurls. Therefore, it is possible to avoid the problem by increasing the conveying speed. However, if the discharging speed is excessively increased, noise generated by the paper conveying motor or sliding noise between the recording paper and the members constituting the recording apparatus is generated. Sometimes became uncomfortable as it grew. When the recording paper is conveyed by a plurality of conveyance rollers having different rotation axes, the recording unit determines the conveyance speeds of the plurality of conveyance rollers so that the recording paper is stretched. In many cases, therefore, the vibration sound of the recording apparatus may be amplified by the stretched recording paper, which may increase discomfort.

On the other hand, if the discharging speed is increased in a low humidity environment, the amount of static electricity generated by sliding on the housing, the discharge tray itself, and the recording results stacked on these increases. Therefore, the discharge resistance increases, and in the worst case, there is a problem that the recording paper is not completely discharged from the recording device, which may cause a problem that is contrary to the high humidity environment. In addition, when the trailing edge of the paper is pulled closer to the member located above the discharge port due to static electricity, the next discharged print result may enter underneath it, causing problems such as disordered alignment. there were. Therefore, if the discharge speed is reduced to avoid the above-mentioned problem, the throughput will be decreased this time, and when printing is performed on the recording paper with low elasticity under the high humidity environment, the discharge is completed as described above. Before doing so, there was a problem that the recording paper buckled and it was not ejected in the correct posture. When the buckling occurs,
The printing operation may end in the state where the trailing edge of the recording paper is in contact with the discharge roller disposed on the most downstream side of the paper transport path. There is also a problem that the ejected sheet is pulled back into the recording apparatus.

Further, when a spur member is used for the discharging means, the trailing edge of the sheet is caught by the tooth-shaped portion of the spur, which makes it more likely to be caught and may damage the trailing edge of the sheet.

Therefore, conventionally, although the cost is increased, parts and the like are added to avoid mechanical problems, and
It was common practice to balance the two conflicting defects while setting a discharge rate that minimizes the extent of the defects.

[0008]

The present invention has been made in view of the above problems, and the main means for solving the problems is to discharge the recording paper in accordance with the position of the trailing edge of the recording paper. Is changed to minimize the problems due to static electricity generation and buckling and the noise without increasing the cost and increasing the size of the device.

[0009]

【Example】

(Embodiment 1) FIG. 1 shows a perspective view of a recording apparatus according to the present invention. Here, 2 is a discharge stacker in which metal is coated.

FIG. 2 is a side view of the recording apparatus shown in FIG. 1. In the recording apparatus according to the present invention, the contact position X between the discharge stacker and the trailing edge of the recording result is in the sheet conveying direction rather than the discharging means Y. (Arrow in the figure) It is configured to be located on the downstream side. Such a configuration is often adopted when a horizontal transport mechanism or the like, which has been often adopted in recent years because of its good transport performance for thick paper and the like.

FIG. 3 shows an example of the configuration of the printer section according to the present invention.

Here, 1 is a carriage for mounting a recording head (not shown) (in this embodiment, a disposable type ink cartridge is used) for scanning. Reference numeral 5 is a flexible cable for connecting the recording head and the controller. Reference numeral 7 denotes a guide shaft for scanning and guiding the carriage 1, and a bearing 9 of the carriage 1
Has been inserted into. Numeral 11 is a timing belt to which the carriage 1 is fixed and which transmits power for scanning the carriage 1, and pulleys 13A and 13B arranged on both sides of the apparatus.
It is stretched over. The carriage motor 14 is directly connected to one of the pulleys 13B, and the driving force is transmitted as necessary.

Denoted at 15 is a conveying roller which is a first sheet guide for regulating a recording surface of a recording sheet (hereinafter also referred to as recording sheet) and for conveying the recording sheet at the time of recording.
It is driven by a carry motor (not shown). Reference numeral 21 denotes a pinch roller which is disposed in the middle of the feeding path of the recording sheet and presses the recording sheet toward the conveying roller to convey the same. Reference numeral 23 denotes a conveying roller for the pinch roller by a spring (not shown). It is a pinch roller holder as a second paper guide that axially supports while applying a pressure contact force in the direction. 27
Is a spur rotatably supported by the guide rail 31, and regulates the position of the recording surface of the paper. 29A, 29
Reference numeral B denotes a paper discharge roller for discharging the recording medium toward a paper discharge port (not shown), which is formed by integrally molding an ABS resin and an elastomer and is arranged at a position facing the spur. , Is biased in the spur direction by a spring (not shown). Further, the paper discharge roller and the carrying roller are connected to a paper carrying motor (not shown) through a gear train, and the carrying amount with respect to the drive amount per unit of the paper carrying motor is larger than that of the paper carrying roller. Since it is configured to be larger than the above, the sheet at the recording position receives an appropriate tension and is in a tensioned state, so that the distance from the recording head can be accurately maintained. Here, the spur is 29A
The spur corresponding to 29B is arranged farther from the printing surface than the spur corresponding to. This is carried after regulating the trailing edge of the sheet in a direction in which the trailing edge of the sheet is pressed against the rib r provided on the platen 33 so that the trailing edge of the sheet does not come into contact with and destroy the recording head after the sheet comes out of the conveying roller. Because of. Further, 35 is a paper end sensor, and 36 is a paper end sensor lever.

FIG. 4 is a cross-sectional view of the recording apparatus in which the main conveyance roller 15, the paper discharge roller, the spur, and the recording paper 4 are viewed.
FIG. 1 is a diagram showing a configuration of a paper end sensor lever 36.

The sheet conveying motor (not shown) has a step angle of 7.5 degrees and is driven by W1-2 phase drive.
The gear train is configured so that the carry amount per step corresponds to 1/360 inch. Further, the carrying amount of the discharge roller is configured to be about 1% larger than the carrying amount of the main carrying roller. This is to prevent the slack of the paper by applying tension to the paper between the two rollers, and to keep the distance between the nozzle formed in the head and the recording surface of the paper accurately and always constant.

The contact position A between the main transfer roller and the paper is the first position, the contact position B between the discharge roller and the paper is the second position, and C is the third position in the paper transport direction. .

FIG. 5 shows a recording sequence in this embodiment.

FIG. 6 shows a sequence of the sequence shown in FIG.
Paper transport (S109, S111, S113, S115)
Is a chart showing the speed, and the vertical axis represents the drive frequency of the carry motor, and the horizontal axis represents the sheet trailing edge position. In this figure, the print command is canceled when the trailing edge of the sheet reaches the third position, but the printing instruction remains when the trailing edge of the sheet passes through the third position. Sometimes FIG.
It is assumed that the speed is increased after the print command is completed as shown in. This is to ensure the conveyance accuracy during printing. The inflection point a is set at a position where the trailing edge of the paper is sent slightly downstream of the contact point between the transport roller and the pinch roller. This is because the error in the detection position of the paper end sensor is taken into consideration. On the other hand, when the above command remains, 4000 pps (70.6 m) until the command is completed.
The paper conveyance motor is driven at m / sec) and the driving frequency is 6000 pps (105.8 mm) when printing is completed.
/ Sec) to complete the discharge. The discharging performance is improved as the discharging speed is increased from 4000 pps, but in the present embodiment, 6000 pps, which is judged from the experimental results that the practically sufficient performance is obtained, is adopted.

FIG. 8 is a block diagram showing a structural example of a control system of an ink jet recording apparatus to which the present invention is applied. FIG.
In, the capping position and the moving position of the carrier 11 can be known based on the detection of the carrier home sensor. 1000 is an MPU for controlling each part, 10
01 is an RO that stores programs corresponding to the control procedure
M, 1002 are a RAM used as a work area when the control procedure is executed, 1003 is a timer for measuring time, and 1004 is an interface unit. Note that command data, recording data, and the like can be input to the control system from the keyboard.

(Embodiment 2) In the first embodiment described above, there are two kinds of paper conveyance speeds of 4000 and 6000 pps.
More types may be set as shown in FIG. 9, and the speed may be changed steplessly as shown in FIG.

(Embodiment 3) In the present invention, it is not always necessary to perform constant control in all cases, and the result detected by a temperature detecting means such as a thermistor incorporated in the apparatus is taken into consideration in consideration of the temperature characteristic of the paper. The paper transport speed is changed accordingly, and when the temperature is above a certain temperature, the control shown in FIG. 5 is performed.
At other times, the control shown in FIG. 9 may be performed.
Further, it is not always necessary to detect the temperature, and for example, the humidity may be detected, or the temperature may be changed according to the paper type, the paper size, and the like.

(Embodiment 4) Further, the holding member does not have to be a carrying roller, but may be a driven roller or a paper holding member 50 for preventing floating of the paper as shown in FIG.

In the ink jet head used in each of the above-mentioned embodiments, the heating element is provided in the nozzle for ejecting ink, and the thermal energy generated by the heating element forms a bubble in the ink, and the bubble expands. The ink droplets are ejected from the nozzles.

[0024]

As is apparent from the above description, according to the present invention, it is possible to obtain a printing apparatus having a good discharge property without increasing the cost and increasing the size of the apparatus.

[Brief description of drawings]

FIG. 1 is a perspective view of a recording apparatus main body.

FIG. 2 is an external view showing a positional relationship among a recording apparatus body, a discharge roller, and a discharge stacker.

FIG. 3 is a perspective view of a recording device.

FIG. 4 is a cross-sectional view of the recording device.

FIG. 5 is a flowchart showing control during recording.

FIG. 6 is a chart showing the relationship between the sheet conveyance speed and the sheet trailing edge position.

FIG. 7 is a chart showing the relationship between the sheet conveyance speed and the sheet trailing edge position.

FIG. 8 is a block diagram showing a configuration example of a control system.

FIG. 9 is a flowchart showing another embodiment.

FIG. 10 is a chart of a sheet transport speed showing another embodiment.

FIG. 11 is a cross-sectional view of a recording unit showing the configuration of another embodiment.

[Explanation of symbols]

 S Paper transport direction 1 Carriage 5 Flexible cable 7 Guide shaft 9 Bearing 11 Timing belt 13A, 13B Hook 14 Carriage motor 15 Transport roller 21 Pinch roller 23 Pinch roller holder 27 Spur 29A, 29B Paper discharge roller 31 Guide rail 33 Platen 35 Paper end Sensor 36 Paper end sensor lever 50 Paper holding member 1000 MPU 1001 ROM 1002 RAM 1003 Timer 1004 Interface section

Claims (9)

[Claims] 1. A recording apparatus, wherein a conveyance speed of a sheet is changed with respect to a conveyance speed at the time of recording from the end of recording until the rear end of the sheet is ejected from a sheet ejecting unit. 2. The recording apparatus according to claim 1, wherein the ejected paper is ejected at a conveyance speed sufficient to eject it to a position where it does not touch the paper ejecting means. 3. A part or the whole of the paper discharge means is composed of a spur member.
The recording device according to 1. 4. The recording apparatus according to claim 2, wherein the paper discharge unit performs a reverse operation between the end of paper discharge and the start of discharge of the next paper. 5. The recording apparatus according to claim 2, wherein a contact position between the recording result supporting unit and the trailing end of the discharged recording result is on the downstream side of the sheet discharging unit in the sheet conveying direction. 6. The recording apparatus according to claim 2, wherein the change of the sheet conveying speed is performed according to the type of sheet. 7. The recording apparatus according to claim 2, wherein the change of the sheet conveying speed is performed according to a detection result of a temperature detecting unit. 8. The sheet discharging unit and the sheet conveying unit are driven by the same driving unit, and the sheet conveying amount per unit drive amount of the driving unit is larger in the discharging unit than in the sheet conveying unit. 3. The recording apparatus configured as described above, wherein the timing of changing the transport speed is after the trailing edge of the sheet has passed the sheet transporting unit.
The recording device according to 1. 9. The recording apparatus according to claim 2, wherein the discharging speed is 75 mm / sec or more.