JP2001253060A - Printer with ink jet cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer having an ink jet cartridge which prints a sharp image even on a paper such as an envelope and is free from the possibilities that the paper might be smeared by ink, even when a paper gap between the print end part of the ink jet cartridge and the paper is small. SOLUTION: This printer having a carriage 3 on which the ink jet cartridge 4 is mounted, prints the paper K to be fed to the downstream side of a printer body, while reciprocating in the width direction of the paper K. In this printer, paper holding rollers 7, 7 which rotate in contact with the paper K are arranged on the back 31 at the upstream side of the carriage 3 in the paper feed direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer having a carriage equipped with an ink jet cartridge for printing while reciprocating in the width direction of a sheet sent downstream of a printer body, and more particularly to a printing end of the ink jet cartridge. The present invention relates to a printer having an ink-jet cartridge in which a sheet is not stained with ink even if a paper gap between a unit and a sheet is small.

[0002]

2. Description of the Related Art Generally, when a paper gap between a printing end portion of an ink jet cartridge and a sheet of paper in a printer is small, when printing on an envelope or the like, the surface of the sheet of the envelope or the like is covered with the ink of the ink jet cartridge. There is a problem that the thick paper may be stained by contacting the discharge port. However, attempts have been made to reduce the paper gap between the printing end of the ink jet cartridge and the paper in order to improve the sharpness of the print.

[0003] Japanese Patent Application Laid-Open No. 63-65453 discloses an image forming apparatus. This is shown in FIG.
(A) As shown in (b), a plurality of image forming members are integrated into a cartridge, which is removably housed in the machine body, and a transfer material for holding an image formed by the cartridge is sent to a fixing portion. In an image forming apparatus adapted to supply
At a position after the transfer of the cartridge 102, a pressing unit 104 that presses the transfer material onto the conveyance path 106 at the fixing portion
Are integrated with the cartridge. However, in this case, since the pressing means 104 is provided at a position apart from a portion to be printed on the transfer body, there is a possibility that the print on the transfer body may become dirty when the transfer body is wavy in the course of conveyance. There was a problem.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and enables clear printing even on paper such as an envelope even if the paper gap between the printing end of the ink jet cartridge and the paper is reduced. It is an object of the present invention to provide a printer having an ink jet cartridge which can perform printing and does not cause the paper to be stained with ink.

[0005]

According to an aspect of the present invention, there is provided an ink jet cartridge for printing while reciprocating in a width direction of a sheet fed downstream of a printer body. A paper holding roller that rotates while contacting the paper is disposed on the rear surface of the carriage on the upstream side in the paper feeding direction.

A pair of left and right paper pressing rollers according to a second aspect of the present invention are provided on the rear surface of the carriage on the upstream side in the paper feeding direction in the width direction. According to a third aspect of the present invention, the paper pressing roller is constituted by a gear roller having a tooth portion on an outer peripheral portion. The paper gap between the printing end of the ink jet cartridge according to claim 4 and the paper is one.
It is characterized in that it is small within mm.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a printer having an ink jet cartridge according to the present invention will be described below with reference to the drawings. 1A and 1B show a printer having an ink jet cartridge according to an embodiment of the present invention. FIG. 1A is a side view showing the internal structure of the printer, and FIG. 1B is a rear view showing a part of a carriage on which the ink jet cartridge is mounted.

As shown in FIG. 1A, a printer having an ink jet cartridge according to the present embodiment feeds a sheet K to a downstream side by a pair of upper and lower feed rollers 1 and 2, and moves a carriage 3 in the width direction of the sheet K. Is printed on the paper K by the ink jet cartridge 4 mounted on the carriage 3, and the discharge rollers 5, 6 at the downstream end.
Is discharged.
As shown in FIG. 1B, a pair of left and right gear rollers 7, which rotate while contacting the sheet K, are disposed on the rear surface 31 of the carriage 3 on the upstream side in the sheet feeding direction. The paper gap G between the printing end 41 of the ink jet cartridge 4 and the paper K is 1 mm.
It is effective even if it is small within.

According to the printer having the ink jet cartridge of the present embodiment, the sheet K is pressed by the ink jet cartridge 4 while the sheet K is held by the pair of left and right gear rollers 7, 7 disposed on the rear surface 31 on the upstream side in the sheet feeding direction of the carriage 3. Since printing is performed, the paper gap G between the printing end portion 41 of the ink jet cartridge 4 and the sheet can be maintained, and the surface of the sheet K is not stained with ink. Therefore, even if the paper K is an envelope, the printing end of the ink jet cartridge 4 does not come into contact with the surface of the envelope, and the surface of the paper K formed of the envelope is not stained with ink.

Further, since the paper cap G can be made as small as 1 mm or less, the print on the paper K can be made clear. Also, since the paper K is pressed by the gear rollers 7, 7, the paper K
Can be rotated with the reciprocating movement of the carriage 3 while reliably holding the carriage 3. In the above-described embodiment, the gear roller 7 has been described. However, the present invention is not limited to this, and a roller having a smooth outer surface or a roller having a spherical shape can be applied.

[0011]

As described above, according to the first aspect of the present invention, the rotating paper pressing roller which rotates while contacting the paper is disposed on the rear surface of the carriage on the upstream side in the paper feeding direction. The paper gap between the print end of the ink jet cartridge mounted on the carriage and the surface of the paper can be maintained, and the print end of the ink jet cartridge does not contact the paper surface, and the paper is not stained. It can print clearly even on paper made of envelopes.

According to the second aspect of the present invention, the paper pressing roller is provided on the rear surface of the carriage on the upstream side in the paper feeding direction.
Since a pair of left and right paper is provided in the width direction, the paper is pressed by a pair of left and right paper pressing rollers on both sides in the width direction, so that the paper does not rise or wavy, and the printing end of the ink jet cartridge is Contact with the surface can be reliably prevented, and a clearer print can be obtained. According to the third aspect of the present invention, since the paper pressing roller is constituted by the gear roller having the tooth portion on the outer peripheral portion, the paper can be surely pressed. , The carriage can smoothly move back and forth, and printing can be performed accurately.

According to the fourth aspect of the present invention, since the paper gap between the printing end of the ink jet cartridge and the sheet is as small as 1 mm or less, the distance between the printing end of the ink jet cartridge and the surface of the sheet is small. The paper gap between them can be reduced, and a clearer print can be performed.

[Brief description of the drawings]

FIGS. 1A and 1B show a printer having an ink jet cartridge according to an embodiment of the present invention, wherein FIG. 1A is a side view showing the internal structure of the printer, and FIG. 1B is a rear view showing a carriage portion on which the ink jet cartridge is mounted.

2A and 2B show a conventional image forming apparatus, in which FIG. 2A is a side view showing an internal structure thereof, and FIG. 2B is an enlarged side view showing a pressing roller portion thereof.

[Explanation of symbols]

 Reference Signs List 3 Carriage 31 Upstream back side in paper feed direction 4 Inkjet cartridge 41 Printing end 7 Gear roller K Paper G Paper gap

Claims (4)

[Claims] 1. A printer having a carriage equipped with an ink jet cartridge adapted to print while reciprocating in a width direction of a sheet fed to a downstream side of a printer main body. A printer having an ink jet cartridge, wherein a paper pressing roller that rotates while contacting the paper is provided. 2. The printer having an ink jet cartridge according to claim 1, wherein a pair of left and right paper pressing rollers are disposed in a width direction on a rear surface of the carriage on an upstream side in a paper feeding direction. 3. The printer having an ink jet cartridge according to claim 1, wherein the paper pressing roller is constituted by a gear roller having a tooth portion on an outer peripheral portion. 4. A printer having an ink jet cartridge according to claim 1, wherein a paper gap between a printing end of said ink jet cartridge and said sheet is as small as 1 mm or less. .