JPH10235965A - Ink-jet printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly correctly position and adjust a printing head by setting a fitting member which moves in association with the rotation of an adjustment screw and can press and move the printing head to a drum against an engagement force by an engagement face inclined to an axis of the adjustment screw set in a rotatable state at a side part of an engaging member of the printing head. SOLUTION: The ink-jet printer has an engaging member 330 which can press and engage a printing head 200 to an engagement face 305 of a printing head-supporting frame 300, an adjustment screw member 313 set to be manipulable and rotatable at a side part 304 of the supporting frame 300, and an engagement face 321 inclined to an axis of the adjustment screw member 313. A fitting member 320 is provided, which moves in association with the rotation of the adjustment screw member 313 and can press and move the printing head 200 to a drum 10 by the engagement face 321 against an engagement force of the engaging member 330. Accordingly, the printing head 200 can be quickly and correctly adjusted in position without retreated from the drum 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum rotatable at a constant peripheral speed, a print head capable of spraying ink on a print medium held on the outer peripheral surface of the drum, and a print head supporting the print head. And a print head supporting frame.

[0002]

2. Description of the Related Art A nozzle unit for each color is reciprocated over the entire length in a row direction, and printing is performed during each forward movement to print one line, and after one line printing, a printing medium (plain paper, OHP paper, etc.). Compared to a so-called serial type ink-jet printer, M can be fed one line in the column direction and repeated, so that the printing speed can be greatly increased and continuous printing operation can be performed on a large number of sheets. The present applicant has proposed an ink-jet printer capable of achieving a great reduction in size (for example, Japanese Patent Application No. 8-296959).

That is, in FIG. 5, a drum 10 is rotatable at a constant peripheral speed and can hold a print medium M on an outer peripheral surface 11 thereof. Rotation of this drum 10 (Y)
A nozzle unit 200 for each color is provided in the direction.

[0004] Therefore, an integrated nozzle unit 200 for each color or an integrated nozzle unit 200 for each color in which a plurality of nozzle unit elements are arranged in the row direction (for example, between the ink jet nozzles). Print medium M rotating while moving back and forth by the pitch
Ink can be printed in the row direction by spraying ink from the inkjet nozzles 207 for each color, and can be printed in the column direction while utilizing the rotation of the drum 10 during the forward movement of the pitch between the inkjet nozzles. That is, since the line-direction printing and the column-direction printing can proceed simultaneously, the printing speed can be greatly increased.

Further, since the nozzle unit 200 for each color and the ink tank (not shown) for each color are arranged at a distance from each other, the nozzle unit 200 for each color can be lightened, and the reciprocating movement speed in the row direction can be further increased. The fact that the height can be increased further promotes a higher printing speed, and the capacity of the ink tank for each color can be greatly expanded, so that a continuous printing operation of, for example, 500 or more sheets can be performed.

In order to realize these, one side (right side in FIG. 5) of the drum 10 is provided with a feeding means 60 and a medium feeding means 9.
0, and on the other side (the left side in FIG. 5), the medium peeling means 140, the medium discharging and conveying means 160, and the direction switching means 190
Are provided.

The feeding means 60 can selectively feed the printing medium M one by one from one of the cassette feeding means 71 and the manual feeding means 61. The medium supply means 90 feeds the fed print medium M to the drum 1 at a predetermined timing.
Feed to the 0 side. The medium peeling means 140 peels the print medium M from the drum 10 after printing, and
Numeral 0 discharges and conveys the separated print medium M to the left in FIG. The direction switching unit 190 selectively switches between the discharge tray 192 and the upper discharge tray 193. In this manner, since the feeding, supply, holding, printing, peeling, and discharging and conveying of the print medium M can be continuously performed, multicolor printing of, for example, 20 sheets or more in A4 size can be performed in one minute.

The print head (200) is supported by a print head support frame 300, and its position with respect to the drum 10 is adjusted via positioning means. As shown in FIG. 6, the print head support frame 300
0) can be accommodated.

The positioning means includes a spring member 312 for urging the print head (200) toward the reference surface 311 and a direction for separating the print head (200) from the reference surface 311 against the urging force of the spring member 312. The print head (200) is formed so as to be capable of adjusting the position in a direction orthogonal to the axis of the drum 10. The adjusting screw member 313 is disposed at the end of the print head support frame 300 such that the axis is orthogonal to the drum 10 axis and at a position close to the drum outer peripheral surface 11.

[0010]

In the ink jet printer proposed above, after the print head (200) is inserted into the accommodating portion 301 of the print head support frame 300 toward the drum 10, the adjusting screw member 313 is appropriately rotated. The positioning operation of the print head (200) is performed by performing a moving operation.

However, since the adjusting screw member 313 is close to the drum outer peripheral surface 11 and the turning operation of the adjusting screw member 313 must be performed from the tip end side of the print head support frame 300, the turning operation is performed. It is difficult.

Therefore, the print head support frame 300
Is largely moved in the direction away from the drum 10 from the set state shown by the solid line in FIG. 5, and then the turning operation of the adjustment screw member 313 is performed. In this case, the positioning adjustment of the print head (200) can be performed quickly and quickly. Difficult to do exactly.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ink jet printer capable of quickly and accurately positioning and adjusting a print head.

[0014]

SUMMARY OF THE INVENTION The present invention provides a drum rotatable at a constant peripheral speed, a print head capable of printing by spraying ink on a print medium held on the outer peripheral surface of the drum, and a print head. A print head supporting frame supporting the print head, wherein the print head is pressed against a locking surface of the print head support frame to be locked, and the print head is rotated around a side portion of the print head support frame. An adjusting screw member movably provided, and an engaging surface inclined with respect to the axis of the adjusting screw member, the interlocking member being moved in conjunction with the rotation of the adjusting screw member, and being printed on the engaging surface. An engaging member capable of moving the head against the drum while opposing the locking force of the locking member is provided.

In this case, the adjusting screw member is rotated from the side of the print head support frame. On this occasion,
Even if the print head support frame is disposed close to the drum, the adjustment screw member can be rotated without being hindered by the drum.

The turning operation of the adjusting screw member moves the engaging member, and presses and moves the print head toward the drum at the engaging surface against the locking force of the locking member.

Therefore, the position of the print head can be quickly and accurately adjusted.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. This inkjet printer is shown in FIG.
4 to FIG. 4, the basic configuration is the same as that of the previously proposed inkjet printer (FIG. 5).
An adjustment screw member 313 capable of adjusting the position of the print head (200) is provided on a side portion 304 of the frame 300 via an engagement member 320.

The same components as those in the case of the previously proposed ink jet printer shown in FIG. 5 are denoted by the same reference numerals, and description thereof will be simplified or omitted.

As shown in FIG. 4, the print head support frame 300 is provided so as to be movable with respect to the frame 10F for supporting the rotation of the drum 10 along the table 100. Pin 3
08A is provided with a positioning recess 308B capable of engaging with the positioning recess 308B.

This print head support frame 300 is shown in FIG.
To position at the set position shown in FIG.
The positioning recess 308B is engaged with the positioning pin 308A by being moved toward zero. Next, in that state,
It is fixed to the table 100 by tightening the fixing bolt 309S via 8H. In addition, in FIG.
R and 305L are used to accommodate the print head (200) in the housing section 301.
It is a guide to guide to.

A reference surface 302 is formed on one inner surface of the housing portion 301 of the print head support frame 300, and the print head (200) is
A biasing member 306 capable of biasing toward 02 is provided. On the side 304 of the print head support frame 300,
A lateral position adjustment screw member 307S is provided.

Therefore, when the print head (200) is inserted into the accommodating portion 301 of the print head support frame 300 along the guides (305L, 305R), the print head (200) is directed toward the reference surface 302 by the urging member 306. And the longitudinal end face of the print head (200) comes into contact with the reference plane 302.

Here, the nozzle unit 20 for each color is used.
In order to adjust the position of 0 in the axial direction of the drum 10, as shown in FIG. 3, the dot farthest from the reference plane 302 [for example, the dot (207) of the black nozzle unit 200] is replaced with another dot [yellow, magenta, Each screw member 313 is rotated so that the dots (207) of the cyan nozzle unit 200 are aligned.

As shown in FIGS. 1A and 1B, the locking member 330 is formed so that the print head (200) can be pressed against the locking surface 305 of the print head support frame 300 and locked.

The adjusting screw member 313 is rotatably provided on the side portion 304 of the print head support frame 300. The adjusting screw member 313 is provided so that its axis extends along the axial direction of the drum 10.

The engagement member 320 has an engagement surface 321 inclined with respect to the axis of the adjustment screw member 313, and moves in conjunction with the rotation of the adjustment screw member 313 to move the print head at the engagement surface 321. (200) is formed so as to be able to press and move toward the drum 10 while resisting the locking force of the locking member 330.
In this embodiment, the engaging member 320 is the adjusting screw member 31.
3 and are provided integrally.

Next, the operation of this embodiment will be described. In order to adjust the position of the print head (200) inserted into the storage portion 301 of the print head support frame 300,
The adjustment screw member 313 is rotated from the side 304 of the print head support frame 300. At this time, even if the print head support frame 300 is disposed at the set position, the adjustment screw member 313 can be rotated without being hindered by the drum 10.

According to this embodiment, the locking member 330 capable of pressing the print head (200) against the locking surface 305 of the print head support frame 300 and locking the print head (200), and the side portion of the print head support frame 300 An adjustment screw member 313 rotatably provided at 304, and an engagement surface 321 inclined with respect to the axis of the adjustment screw member 313, move in conjunction with the rotation of the adjustment screw member 313, and move. Engagement surface 32
1, the engaging member 3 capable of pressing and moving the print head (200) toward the drum 10 while resisting the locking force of the locking member 330.
Since the print head (20) is provided, the position of the print head (200) can be quickly and accurately adjusted without being retracted from the drum 10. The locking surface 305 and the locking member 330 may also be used as the drum-side portions (305 ', 330') of the guides (305L, 305R).

[0030]

According to the present invention, a locking member capable of pressing a print head against a locking surface of a print head support frame and locking the same is provided on a side portion of the print head support frame so as to be rotatable. An adjusting screw member, and an engaging surface inclined with respect to the axis of the adjusting screw member, the interlocking member moving in synchronization with the rotation of the adjusting screw member, and locking the print head with the engaging surface. Since the engagement member is provided which can be pressed against the drum while resisting the force, the position of the print head can be easily and accurately adjusted without being retracted from the drum.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining an embodiment of the present invention.

FIG. 2 is also a diagram for explaining position adjustment of a print head in a drum axis direction.

FIG. 3 is a view for explaining a specific position adjustment of the print head in the drum axis direction.

FIG. 4 is a diagram for explaining the overall configuration.

FIG. 5 is a diagram for explaining a previously proposed inkjet printer.

FIG. 6 is a view for explaining position adjustment of the print head.

[Explanation of symbols]

 Reference Signs List 10 drum 11 outer peripheral surface 200 nozzle unit (print head) for each color 300 print head support frame 301 housing portion 305 locking surface 313 adjusting screw member 320 engaging member 321 engaging surface 330 locking member

Claims (1)

[Claims] 1. A drum rotatable at a constant peripheral speed, a print head capable of printing by spraying ink on a print medium held on an outer peripheral surface of the drum, and a print head support frame supporting the print head. An ink jet printer comprising: a locking member capable of pressing the print head against a locking surface of the print head support frame to lock the print head; and an adjustment member rotatably provided on a side portion of the print head support frame. A screw member, and an engagement surface inclined with respect to the axis of the adjustment screw member. The engagement member is moved in conjunction with the rotation of the adjustment screw member to lock the print head at the engagement surface. An ink jet printer, comprising: an engaging member capable of pressing and moving toward the drum while resisting force.