JPH1086354A - Ink jet printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately replace a rotary body preventing the levitation of a printing image forming medium from a platen roller immediately after the formation of a printing image corresponding to the kind of the printing image forming medium. SOLUTION: An arm 58 is supported on a machine body 22 so as to be freely shakable in a direction coming into contact with a platen roller 18 and separating therefrom. A plurality of kinds of rotary body attaching plates 32 to which rotary bodies such as a star roller 38, a soroban (bead on abacus) rotary body and a cask-shaped rotary body are selectively attached in a freely rotatable manner are prepared at every kinds of rotary bodies. A desired kind of a rotary body attaching plate 32 can be attached to the arm 58 in a detachable manner and a printing image forming medium 24 immediately after a printing image is formed on the platen roller 18 is pressed to the platen roller 18 by the rotary body of the rotary body attaching plate 32 attached to the arm 58.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an industrial ink jet printer.

[0002]

2. Description of the Related Art A conventional ink jet printer is shown in FIG.
As shown in FIG. 1, while the roll paper 2 as the printing image forming medium is fed out and conveyed along the peripheral surface of the platen roller 4,
The ink jet print head 6 is reciprocally driven along the longitudinal direction of the platen roller 4, ejects ink from the head 6, and performs printing on the paper 2 on the peripheral surface of the platen roller 4. The head unit 8 to which the print head 6 is attached is supported on a carriage 10, and the carriage 10 is configured to reciprocate along a guide rail 12 in a direction perpendicular to the plane of FIG. One end of an arm 16 is fixed to both ends of a rotating body mounting plate 14 that supports a rotating body 12 such as a plurality of star rollers or rubber rollers so as to be rotatable coaxially.
A shaft 18 is rotatably supported by the body of the ink jet printer. The rotating body 12 such as a star roller contacts the sheet 2 immediately after printing by the print head 6, and the sheet 2
Is prevented from floating from the peripheral surface of the platen roller 4.

[0003]

The ink jet printer which prints and prints on a sheet such as a paper used for a signboard has a problem in the weather resistance of the ink and the like, and its recognition in the market is low. In recent years, ink jets have become well known, and at the same time, the development of inks having weather resistance has been progressing, and the use and development of inks for industrial use have been actively performed. When an ink jet printer is used for industrial use, especially for outdoor signboards, the media to be printed are various from thin to thick, from soft to hard, and from weak to strong with a coated surface. This is significantly different from the use environment of an inkjet printer used for offices, and requires a flexible paper transport mechanism. Ink used for inkjet printers has low viscosity unlike printing inks,
Depending on the paper, it takes a long drying time, and if the paper immediately after printing is pressed, the printed result is often stained.
Conventional ink jet printers have a configuration in which a rotating body such as a star roller that presses the paper immediately after printing is not easily detachable from the machine. For this reason, it was not possible to selectively change the paper conveyance (pass) suitable for various types of paper, that is, the path suitable for the stiffness of the paper and the pressing method suitable for the strength of the image receiving surface (coating surface). . An object of the present invention is to solve the above problems.

[0004]

To achieve the above object, the present invention conveys a sheet along a peripheral surface of a platen roller rotatably supported by a machine body, while conveying a sheet along a longitudinal direction of the platen roller. In an ink jet printer in which an ink jet type print head is reciprocated to perform printing on a sheet printing medium on a peripheral surface of a platen roller, an arm is swingably movable in a direction of coming and going with respect to the platen roller. Multiple types of rotating body mounting plates are provided for each type of rotating body, with one type of rotating body selected from among rotating bodies such as bearings, star rollers, abacus-shaped rotating bodies or barrel-shaped rotating bodies. And a printing medium immediately after printing on the platen roller, wherein a rotating body mounting plate of a desired type can be removably mounted on the arm. Pressing a rotating body of the rotating member mounting plate attached to the arm, of the print drawing medium is obtained by so as to prevent floating from the platen roller peripheral surface.

[0005]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In FIG. 5, 1
Reference numeral 8 denotes a platen roller.
0 so as to be rotatable. On the right side of the platen roller 18, the paper 24 on the platen roller 18
A head section 28 having a print head 26 for performing printing on a (printing / printing medium) is provided movably along the platen roller 18.

The head section 28 is movably mounted on a guide rail (not shown) extending in the direction perpendicular to the paper of FIG. A roll portion 24a of roll paper is supported between the legs of the printer 20 below the machine body 22, and the roll paper 24 fed from the roll portion 24a passes through a buffer guide 26, a platen roller 18, and a discharge guide 28. , And is configured to be discharged to the front side of the inkjet printer 20.

Reference numeral 30 denotes a printing image medium holding member, which is composed of a long rotating body mounting plate 32 having a U-shaped cross section and a plurality of star rollers 38. The center of both ends of a spring 42 is fixed to the rotating body mounting plate 32, and star roller shafts 34, 36 are supported in shaft holding grooves of the spring 42, and the star roller shafts 34, 36 are provided with a plurality of star rollers 38, ie, rotating. The body is rotatably mounted. As shown in FIG. 10A, the outer peripheral surface of the star-shaped body of the star roller 38 is formed in a star shape or a spur shape. The mounting plate 32
, A paper ejection guide 40 is attached at a lower portion thereof. The star roller shafts 34 and 36 are movable in the vertical direction by the elasticity of a spring 42 mounted on the mounting plate 32.

A hinge member 44 is fixed to one end of the mounting plate 32 in the longitudinal direction. Holes are formed in the hanging pieces 44a, 44b of the hinge member 44, and a slide shaft 46 is slidably fitted in the holes. A lower portion of a lever 48 is fixed to the slide shaft 46.
Reference numeral 8 is slidably fitted and disposed in a long hole 50 provided in the hinge member 44.

The slide shaft 46 is urged by a spring 52 in a direction protruding from one end of the hinge member 44, and one end of the slide shaft 46 projects from a hanging piece 44 a at one end of the hinge member 44. A hinge member 54 is fixed to the other end of the mounting plate 32 in the longitudinal direction, and a hole 56 is formed in a hanging piece of the hinge member 54 on a coaxial extension with the slide shaft 46.

Reference numeral 58 denotes an arm positioned at one end in the longitudinal direction of the platen roller 18 and rotatably supported on the right side of the body 22 by one of the arms for receiving the slide shaft 46. A hole 62 is provided. An arm 64 is rotatably supported on the left side of the body 22 at the other end of the platen roller 18 in the longitudinal direction, and a hinge shaft 66 protrudes from one of the arms 64.

The rotation centers of the arms 58 and 64 are set on a coaxial line parallel to the central axis of the platen roller 18. Further, one hole 62 of the arm 58 and one hinge shaft 66 of the arm 64 are also set on a coaxial line parallel to the central axis of the platen roller 18. 6
Reference numeral 8 denotes a rod arranged on the right side of the body 22, and a rod having the same shape as this is also arranged on the left side of the body 22.

A U-shaped portion 68a is formed on one of the right and left rods 68, and a substantially middle point of the U-shaped portion 68a is rotatably connected to one of the corresponding arms 58 and 64 by a shaft 72. Supported. Reference numerals 74 denote links arranged on both sides of the body 22 (the other is not shown), and one end 74a of each of the links is fixed to both ends of a rotating shaft 76 rotatably supported by the body 22. The pair of links 7
The other end of the pair of rods 68 is rotatably supported on one end of each of the shafts 4.

One of the pair of links 74
Is integrally formed with a sheet release lever 74a.
When attaching the printing image medium holding member 30 to the arms 58 and 64, one hinge member 54 of the holding member 30 is opposed to the arm 64, and the hinge shaft 66 is inserted into the hole 56 of the hinge member 54. Next, the lever 48 is moved rightward along the long hole 50 in FIG. 1 against the elasticity of the spring 50,
The tip of the slide shaft 46 is attached to the hanging piece 44 of the hinge member 44.
a from the guide hole of the hanging piece 44a and the arm 58
When the pulling force of the lever 48 is released after that, the slide shaft 46 projects leftward in FIG.
Fits into the hole 62 of the arm 58.

Thus, the printing / image forming medium holding member 30
Is supported between the arms 58 and 64. In this state, the paper release lever 74a is pivoted about the shaft 76 as shown in FIG.
When swinging clockwise in the middle, the rod 68 is pushed up, the arm 58 swings clockwise about the shaft 60, and the holding member 30 moves in a direction away from the platen roller 18. In this state, the operator can set the sheet on the platen roller 18. At this time, the two protrusions 78 of the U-shaped portion 68a of the rod 68,
Reference numeral 80 acts as a stopper against the swing of the rotating body mounting plate 32 about the shafts 46 and 66.

Next, as shown in FIG. 8, the lever 74a is pushed down, and the lever 74a is
When swinging in the counterclockwise direction, the rod 68 descends, and the arm 58 swings counterclockwise in FIG. 8 around the shaft 60, and the rotating body mounting plate 32 approaches the platen roller 18. . Thus, the star roller 38 on one shaft 36 contacts the surface of the platen roller 18 from above the sheet, and the star roller 38 on the other shaft 34 contacts the guide roller 82 from above the sheet 24. Medium holding member 3
6, the lever 48 is pulled rightward with a finger to remove the slide shaft 4 from the arm 58, 64.
6 while being retracted into the hinge member 44,
Lift diagonally to the right.

Thus, the slide shaft 46 is connected to the arm 5
8 comes off the hole 62. Next, release the hand from the lever 48 and, as shown in FIG. 7, lift the medium pressing member 30 diagonally upward and to the left, and move the hinge member 54 to the arm 64.
From the hinge shaft 66. A plurality of types of media press members 30 other than those provided with the star roller 38 are prepared, and are exchanged according to the print image forming medium.

When the printing image forming medium is a cloth, a medium to which "abacus-shaped roller 84" shown in FIG. 10B or "barrel-shaped roller 86" shown in FIG. 10C is attached in order to prevent the fiber from being caught. Replace with the holding member 30. Further, the arrangement of the rollers may be inclined in the direction in which the wrinkles of the cloth are extended. If the print screen medium is a backlight film,
The coating layer is generally very thin because the ink does not reach the bottom of the coating layer to obtain a clear image on the opposite side.

The back light film is transferred to a star roller 38.
If you hold it down, the abacus shape will damage the coat
Roller 84 or replace the medium holding member 30 with a "sponge-shaped" roller. When the printing medium is a thick PVC sheet or tarpaulin, the sheet has a strong stiffness. Therefore, a one-stage medium pressing member in which a star roller is arranged on one axis is used. By changing the (pass), change the discharge angle,
Reduces the degree of sheet bending.

[0019]

As described above, according to the present invention, a sheet discharging method suitable for a sheet can be selected, so that an optimum sheet conveying method can be adopted for many sheets.

[Brief description of the drawings]

FIG. 1 is a side view of a part of an ink jet printer.

FIG. 2 is a front view of one side of a printing image medium holding member.

FIG. 3 is a front view of the other side of the printing image medium holding member.

FIG. 4 is a bottom view of one side of a printing image medium holding member.

FIG. 5 is a bottom view of the other side of the printing image medium holding member.

FIG. 6 is an external view of a part of the inkjet printer.

FIG. 7 is an external view of a part of the ink jet printer.

FIG. 8 is a side view for explaining operation of a part of the ink jet printer.

FIG. 9 is a side view illustrating an operation of a part of the ink jet printer.

FIG. 10 is an explanatory diagram of a rotating body.

FIG. 11 is a side view of the prior art.

[Explanation of symbols]

 2 Roll paper 4 Platen roller 6 Print head 8 Head unit 10 Carriage 12 Rotary body 14 Rotary body mounting plate 16 Arm 18 Platen roller 20 Inkjet printer 22 Body 24 Paper (printing medium) 26 Buffer guide 28 Discharge guide 30 Print image medium Pressing member 32 Rotating body mounting plate 34 Star roller shaft 36 Star roller shaft 38 Star roller 40 Discharge guide 42 Spring 44 Hinge member 46 Slide shaft 48 Lever 50 Long hole 52 Spring 54 Hinge member 56 Hole 58 Arm 60 Shaft support 62 Hole 64 Arm 66 hinge shaft 68 rod 70 shaft 72 shaft 74 link 74a paper release lever 76 rotation shaft 78 protrusion 80 protrusion 82 guide roller 84 abacus roller 86 barrel roller

Claims (1)

[Claims] An ink jet print head reciprocates along a longitudinal direction of a platen roller while conveying a sheet along a peripheral surface of a platen roller rotatably supported by a machine body. In an ink jet printer adapted to perform printing on a sheet-like printing image medium, an arm is supported so as to be swingable in a direction approaching and separating from the platen roller, and a star roller, an abacus-shaped rotating body or a barrel-shaped rotating body is provided. A plurality of types of rotator mounting plates are provided for each type of rotator, with one type of rotator selected from among the rotators, and a desired type of rotator mounting plate is removed from the arm. The rotating body of the rotating body mounting plate attached to the arm is pressed against the printing medium immediately after printing on the platen roller. An ink jet printer, wherein the printing image medium is prevented from floating from the peripheral surface of the platen roller.