JPH1086355A - Ink jet printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the position of an ink jet printing head in a before and behind direction with respect to paper and the inclination of the arranging axial line of a plurality of ink orifices of the printing head. SOLUTION: Guide rails 4, 6 guiding a carriage 12 in a linear direction are arranged to a machine body and a platen roller 46 is supported in a rotatable manner. The carriage 12 is loaded with a head part 16 equipped with an ink jet printing head 24. The printing head 24 is reciprocally moved along the platen roller 46 by the reciprocal movement of the carriage 12 along the guide rails 4, 6. At this time, ink is emitted from the printing head 24 to apply a printing image to the paper 48 fed along the peripheral surface of the platen roller 46. The head part 16 is supported on the carriage 12 so as to be adjustable in the forward and rearward movement with respect to the platen roller 46. Further, the head part 16 is supported on the carriage 12 in a tiltable manner so that the arranging axial line of the ink emitting orifices of the printing head 24 can be adjusted in the direction coinciding with the scanning direction to the paper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet printer having a function of adjusting the print head front and rear with respect to the paper surface and an inclination adjusting function.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. Hei 2-202043 discloses that a recording head is rotated about a guide shaft as a rotation axis by displacement of a lever, so that the front surface of the recording medium and the surface of the medium can be adjusted in accordance with the thickness of the recording medium. There is disclosed an ink jet printer capable of adjusting the distance to the printer. Japanese Patent Application Laid-Open No. Sho 60-262652 discloses an ink jet printer in which a positioning portion is provided in each of an ink jet head and a carriage so that a distance between a nozzle and a sheet is set to be constant. Japanese Patent Application Laid-Open No. 1-75248 discloses a means capable of changing a distance between a recording head and a recording material held by a platen according to the thickness of the recording material and adjusting the distance to a predetermined value. An ink jet printer provided is disclosed.

[0003]

When a plurality of ink ejection ports are arranged on the print head in the paper scanning direction coaxially, the paper scanning direction along the guide rail of the print head and the arrangement axis of the plurality of ink ejection ports are aligned. Must be set exactly parallel. If the array axis of the plurality of ink ejection ports is inclined with respect to the paper scanning direction of the print head, accurate printing cannot be performed even if the distance between the print head and the paper is accurately adjusted. A main object of the present invention is to provide a printhead tilt adjustment mechanism in addition to a printhead front-back adjustment mechanism, thereby enabling precise inkjet recording. Another object of the present invention is to make it possible to perform the front-back adjustment and the inclination adjustment of the ink head with a simple mechanism.

[0004]

In order to achieve the above object, the present invention provides an airframe, a platen roller rotatably supported by the airframe, a head section having an ink jet print head, and a head section. And a guide rail that guides the carriage in a linear direction along the longitudinal direction of the platen roller. The carriage ejects ink from the print head and conveys the paper along the peripheral surface of the platen roller. In an ink jet printer adapted to perform printing, the head portion is supported on the carriage so as to be movable in the front-rear direction with respect to the platen roller, and the inclination of the head portion is arranged in each of the ink ejection ports of the print head. If the axis can be adjusted in a direction that matches the scan direction of the print head with respect to the paper, A fuselage, a platen roller rotatably supported by the fuselage, a head unit having an ink jet print head, a carriage mounted with the head unit, and the carriage in a linear direction along the longitudinal direction of the platen roller. And a guide rail for guiding the print head to eject ink from the print head and perform printing on paper conveyed along the peripheral surface of the platen roller. Supporting the side portion movably along a shaft perpendicular to the longitudinal direction of the guide rail,
The head portion is urged in a retreating direction away from the platen roller along the shaft body, and a front-rear adjustment screw is supported on the carriage so as to be movable in the axial direction by the rotation thereof. Abutting a rear wall surface of the head portion, and the other side portion of the head portion elastically contacts the carriage by spring force via an inclined surface provided on the head portion and a tilt adjusting piece contacting the inclined surface, and the head portion is contacted with the head portion. A tilt adjustment plate is provided movably in conjunction with the tilt adjustment piece,
The tilt adjustment plate can be moved in a direction in which the relative position between the tilt surface and the tilt adjustment piece changes by rotation of a tilt adjustment screw.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below in detail with reference to the embodiments of the present invention shown in the attached drawings. Reference numeral 2 denotes a base of the ink jet printer, which is supported by a leg (not shown). FIG.
Upper and lower guide rails 4 and 6 extending in the direction perpendicular to the paper are fixed, and a carriage 12 is movably mounted on the guide rails 4 and 6 via a slider 8 and a roller 10. A shaft 14 is arranged on the carriage 12 so as to be perpendicular to the longitudinal direction of the guide rails 4 and 6 in a plane horizontal to the floor, and an intermediate portion of the shaft 14. Are fixed to the 12. The carriage 1
A substrate 16a of the head unit 16 is disposed on the base 2, and bearings 18 and 20 fixed to the substrate 16a are slidably fitted to the shaft 14.

The bearing 20 is urged in the direction of arrow A in FIG. 8 by a coil spring 22 mounted on the shaft 14. An ink jet print head 24 is mounted on the head unit 16. The print head 24 is provided with a plurality of ink ejection ports on the same axis parallel to the guide rails 4 and 6. Reference numeral 26 denotes an L-shaped plate fixed to the substrate 16a via a bracket, and an inclination adjusting plate 28 is disposed in contact with the L-shaped plate. The head of the tilt adjusting screw 30 is rotatably fitted in the support hole at the rising portion of the tilt adjusting plate 28 so that the head of the tilt adjusting screw 30 does not shift in the axial direction.

The screw portion of the tilt adjusting screw 30 is
It is screwed into the screw hole of the rising part. A long hole (not shown) is provided in a horizontal portion of the inclination adjusting plate 28 in a direction parallel to the shaft body 14, and a screw hole formed in a horizontal portion of the L-shaped plate 26 is screwed into the long hole. The shaft portion of the screw 32 to be fitted is slidably fitted. Mounting piece 2 of the tilt adjusting plate 28
A tilt adjusting piece 34 is supported by 8a so as to be able to move up and down.

The tilt adjusting plate 28 is urged downward with the carriage 12 as a fulcrum by the tensile elastic force of the spring 36, and the urging force causes the substrate 16a to move clockwise in FIG. Being energized. 38
Is a taper member fixed to the substrate 16a, and its inclined surface 38a elastically contacts the upper circumferential surface of the tilt adjusting piece 34 by the tensile force of the spring 36, and the adjusting piece 3
4 has a lower circumferential surface in elastic contact with the upper surface of the carriage 12. Reference numeral 40 denotes a front-rear adjustment screw disposed in parallel with the shaft body 14, which is slidably fitted into a shaft hole of a block member 42 fixed to the carriage 12, and a screw portion is formed on the block member 42. Into the screw hole 44.

The front end of the front-rear adjustment screw 40 is in contact with the rear wall surface of the substrate 16a. Reference numeral 46 denotes a platen roller rotatably supported by the body of the ink jet printer, and the print head 24 faces the platen roller. Next, an operation of adjusting the position of the print head 24 in the front-back direction with respect to the platen roller 46 will be described.

When the knob 40a of the screw 40 for forward / backward adjustment is manually rotated forward and the tip of the screw 40 is moved in the projecting direction, the substrate 16a is pressed against the elasticity of the spring 22 by the pushing force of the tip of the screw 40. Move along the shaft 14 in a direction approaching the platen roller 46, that is, forward. At this time, the print head 24 moves forward as shown in FIG. 1 in conjunction with the substrate 16a. When the knob 40a of the front-rear adjustment screw 40 is manually rotated in the reverse direction and the tip of the screw 40 is retracted, the substrate 16a moves along the shaft 14 with respect to the platen roller 46 by the elastic force of the spring 22. As shown in FIG. In this manner, by rotating the front-rear adjustment screw 40 in the normal and reverse directions, the position of the print head 24 in the front-rear direction can be adjusted.

In order to adjust the inclination of the print head 24, the inclination adjusting screw 3 is manually operated using a driver.
This can be done by rotating 0 in the forward and reverse directions. Rotate the tilt adjusting screw 30 forward to rotate the tilt adjusting plate 2
8 is moved to the right in FIG.
4 pushes up the taper member 38. As a result, the substrate 16a swings counterclockwise in FIG. 4 around the shaft 14 against the tensile force of the spring 36, and the print head 24 moves counterclockwise around the shaft 14 in FIG. Is displaced.

When the tilt adjusting screw 30 is rotated in the reverse direction to move the tilt adjusting plate 28 to the left in FIG. 7, the tilt adjusting piece 34 moves to the left in FIG. Thereby, the substrate 16a is moved by the tensile force of the spring 36 in FIG.
The print head 24 swings clockwise about the shaft 14, and the print head 24 is displaced clockwise about the shaft 14. By adjusting the inclination of the print head 24, the direction of the array axis of each ink ejection port of the print head 24 can be changed.
The scanning direction of the print head 24 with respect to the sheet 48 can be matched.

[0013]

As described above, according to the present invention, since the front-back adjustment and the tilt adjustment of the print head can be performed, there is an effect that an accurate printing can be performed.

[Brief description of the drawings]

FIG. 1 is a side view of a part of an ink jet printer, showing a state where a print head is advanced.

FIG. 2 is a side view of a part of the ink jet printer, showing a state where a print head is retracted.

FIG. 3 is a plan view of a head unit.

FIG. 4 is a rear view of the head unit.

FIG. 5 is a side view of a head unit.

FIG. 6 is a rear view of the head unit.

FIG. 7 is a side view of a head unit.

FIG. 8 is an explanatory diagram showing a front-back adjustment mechanism of a head unit.

[Explanation of symbols]

 2 Base 4 Guide rail 6 Guide rail 8 Slider 10 Roller 12 Carriage 14 Shaft 16 Head 16a Substrate 18 Bearing 20 Bearing 22 Coil spring 24 Print head 26 L-shaped plate 28 Tilt adjusting plate 30 Tilt adjusting screw 32 Screw 34 Tilt adjusting Top 36 Spring 38 Taper member 38a Inclined surface 40 Front-back adjustment screw 42 Block member 44 Screw hole 46 Platen roller 48 Paper

Claims (2)

[Claims] 1. A machine body, a platen roller rotatably supported by the machine body, a head unit having an ink jet print head, a carriage mounting the head unit, and a carriage extending in the longitudinal direction of the platen roller. A guide rail that guides the printhead in a linear direction along with the carriage, wherein the ink jet printer ejects ink from the printhead and performs printing on paper conveyed along the peripheral surface of the platen roller. The head unit is supported so as to be movable in the front-rear direction with respect to the platen roller, and the inclination of the head unit is set in a direction in which the array axis of each ink ejection port of the print head matches the scanning direction of the print head with respect to the paper. An inkjet printer characterized by being adjustable. 2. A machine body, a platen roller rotatably supported by the machine body, a head section having an ink jet print head, a carriage on which the head section is mounted, and the carriage in a longitudinal direction of the platen roller. A guide rail that guides the carriage in a linear direction along with the carriage, wherein the ink jet printer ejects ink from the print head and performs printing on paper conveyed along the peripheral surface of the platen roller. One side of the head is movably supported along a shaft perpendicular to the longitudinal direction of the guide rail, and the head is attached in a retreating direction away from the platen roller along the shaft. Urged, the front-rear adjustment screw is supported on the carriage movably in the axial direction by its rotation, and the tip of the front-rear adjustment screw is The rear wall surface of the head section is abutted, and the other side of the head section is resiliently contacted with the carriage by a spring force through an inclined surface provided on the head section and an inclination adjusting piece contacting the inclined surface, and the inclination of the head section is caused. The tilt adjustment plate is provided so as to be movable in association with the adjustment piece, and the tilt adjustment plate can be moved in a direction in which the relative position between the inclined surface and the tilt adjustment piece changes by rotation of a tilt adjustment screw. And an inkjet printer.