JPH0247023Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an inkjet printer, and particularly to an improvement in the mounting structure of a slider shaft thereof.

[Prior art]

FIG. 5 is a schematic front view of the conventional product, and FIG. 6 is a partially enlarged view showing how the slider shaft is fixed, showing the slider shaft 32 arranged in the front and rear areas of the drum 31 (only one side is shown). A carriage arm 34 with an ink ejecting head 35 therebetween is mounted so as to be movable back and forth in the axial direction of the slider shaft 32, that is, in the axial direction of the drum 31. During printing, the drum 31 is moved by a motor (not shown). Therefore, the ink ejecting head 35 is driven to rotate at a high speed around the axis for main scanning, and the ink ejecting head 35 is driven by a motor (not shown) to the drum 3 while facing the circumferential surface of the drum 1.
It is made to move back and forth in the direction of the axis 1 to perform sub-scanning.

By the way, the slider shaft 32 has one end supported by a support frame 36 that pivotally supports the drum 31, and the other end supported by a support frame 37 that pivotally supports the drum 31, or a support frame 38 extending from the outer support frame 37. However, as shown in FIG.
is screwed into a screw hole formed in the end face of the slider shaft 32 and tightened.

[Problem that the invention attempts to solve]

By the way, the slider shaft 32 in the conventional product as described above is fixed directly to the support frames 36 and 38 with screws, so for example, the length of the slider shaft 32 is longer than the support frame 3.
If it is longer or shorter than the dimension between 6 and 38,
Alternatively, if there is a difference in thermal expansion, or if the support frame 38 has a weaker supporting force than others, the support frames 36, 37, and 38 may bend.
There was a problem in that the slider shaft 32 was deflected and bent, making it impossible to maintain parallelism with the drum 1, preventing smooth movement of the carriage arm 34, and making printing misalignment unavoidable.

[Means for solving problems]

The present invention has been developed in view of the above circumstances, and its purpose is to fix one end of a slider shaft so that it can be moved and adjusted in at least two directions orthogonal to the axis thereof, and to prevent bending or the like from occurring in the support frame. To provide an inkjet printer in which a slider shaft can always be set and maintained parallel to a drum without being affected by this.

The inkjet printer according to the present invention has a carriage arm equipped with an ink jetting head on two slider shafts whose ends are pivotally supported by a support frame so as to be slidable in the axial direction of the drum. The mounted inkjet printer is characterized in that an adjustment mechanism is provided at one end of the shaft support of the slider shaft so that the slider shaft can be moved and adjusted in at least two directions orthogonal to the longitudinal direction of the shaft.

〔Example〕

The present invention will be specifically described below based on drawings showing embodiments thereof. FIG. 1 is a perspective view of an inkjet printer according to the present invention (hereinafter referred to as the present product);
FIG. 2 is a schematic front view of the product, in which 1 is a drum, 2 and 3 are slider shafts, 4 is a carriage arm, and 5a, 5b, 5c, and 5d are ink ejecting heads.

The drum 1 is pivotally supported by a bearing (not shown) at a shaft 1a protruding from both ends thereof, and one shaft is connected to a motor M1 via a pulley provided thereon and a belt _1b adjusted thereto. ₁ allows it to rotate at high speed in the direction of the arrow. Drum 1 is placed in the front and rear areas of this drum 1.
Slider shafts 2 and 3 are disposed in parallel with the support frames 6, 7, and 8 at both ends thereof, and ink jet heads 5a to 5a are disposed on both slider shafts 2 and 3.
A carriage arm 4 provided with 5d is slidably disposed.

A wire 4a connected to a motor _M2 is connected to the carriage arm 4, and the carriage arm ₄ , in other words, the ink ejecting heads 5a to 5d, are reciprocated in the axial direction of the drum 1 by driving the motor M2. It's becoming like that.

In the case of this product, both ends of the slider shafts 2 and 3 are connected to the support frames 6 and 8 at the third and third ends.
As shown in Figure 4, it is fixed and adjustable. Both slider shafts 2, 3 relative to support frames 6, 8
Since the mounting manner of the shaft 2 is substantially the same,
The mounting manner will be explained based on FIGS. 3 and 4. FIG. 3 is an enlarged sectional view showing how both ends of the shaft 2 and the support frame are attached, and FIG. (shown only for the slider shaft 2), one end of which passes through a hole 6a drilled in the support frame 6 to the boulder 9, and the other end passes through the adjustment ring 11 and a hole 7a drilled in the support frame 7 to the boulder 10. are connected and fixed respectively.

The configurations of holders 9 and 10 are substantially the same,
As shown in Figures 3 and 4, one hole 9 into which the main screws 9f and 10f are loosely fitted is provided in the center of the rectangular plate.
a, 10a, and set screws 9g, 10 at the four corners.
One through hole 9b, 10b passing through g is further provided with set screws 9h, 10h approximately at the center of the upper and lower sides.
Two threaded holes 9c and 10c are respectively bored into the threaded holes.

The holders 9 and 10 have through holes 9b and 10b at their four corners.
Connect the set screws 9g and 10g passed through the support frame 6,
Set screws 9h, 10 are screwed into screw holes 6b, 8b drilled in 8, and set screws 9h, 10 screwed into screw holes 9c, 10c.
Holders 9, 10 for the support frames 6, 8 are brought into contact with the end surfaces of the support frames 6, 8 at the tips of h.
The tilt of the screen can be adjusted.

One end of the slider shaft 2 faces the inner surface of the holder 9 through a hole 6a in the support frame 6, which is slightly larger than its diameter, and a main screw 9f is inserted through the hole 9a in the holder 9 into a screw hole 2a drilled in one end surface of the slider shaft 2. By screwing together, the holder 9
It is integrally connected and fixed. The other end of the slider shaft 2 is also exposed to the inner surface of the holder 10 through a hole 8a in the support frame 8, which is slightly larger in diameter than the other end of the slider shaft 2, and a main screw 10f is inserted through the hole 10a in the holder 10 into a screw hole drilled in the other end surface of the slider shaft. 2b, it is integrally connected and fixed to the holder 10.

The adjustment ring 11 has a flange 11b on the outer periphery of one end of the thick cylindrical portion 11a, and a threaded hole 11c penetrating from the outer circumferential surface to the inner circumferential surface of the cylindrical portion 11a near the other end from two orthogonal directions. Drill four holes, screw the adjustment screws 11e into each screw hole 11c,
The distal end is brought into pressure contact with the circumferential surface of the slider shaft 2, thereby forming a mechanism that can finely adjust one end of each of the slider shafts 2 and 3 in two directions perpendicular to their axes.

The flange 11b is provided with through holes 11f at multiple locations in the circumferential direction, and the set screws 11g are screwed into the threaded holes 8c drilled in the support frame 8 through each of the through holes 11f, so that the flange 11b is integrated with the support frame 8. It has become fixed in place.

Therefore, in the case of the product constructed as described above,
Even when the support frames 6 and 8 are bent as shown in FIG.
By relatively adjusting h and 10h (approximately 1 to 0.5 mm), the holders 9 and 10 can be maintained in a non-contact state with the support frames 6 and 8, and the holders 9 and 10 can be adjusted to the deflection of the support frame 8. It can be fixed integrally with the slider shaft 2 without being affected, and since the diameter of the cylindrical portion 11a of the adjustment ring 11 itself is set larger than that of the slider shaft 2, the support frame 8 is not bent. Even if the slider shafts 2 and 3 are attached to the support frame 8 in a slightly inclined state, by adjusting the depth of engagement of the adjustment screw 11e with the threaded hole 11c, each end of the slider shafts 2 and 3 can be fixed. By slidingly adjusting the slider shafts 2 and 3 in a direction perpendicular to the axis thereof, it is possible to always maintain the slider shafts 2 and 3 parallel to the rotation axis of the drum 1, regardless of deflection of the support frame or the like.

〔effect〕

As described above, in the case of this product, an adjustment mechanism is provided at one end of the shaft support of the slider shaft on which the carriage arm to which the ink ejecting head is attached is placed. By moving and adjusting one end of the slider shaft in a direction perpendicular to its axis without being affected by bends, deflections, etc. in the support part of the shaft, the slider shaft can be constantly adjusted to rotate the drum. The present invention has excellent effects, such as being able to maintain the carriage arm parallel to the axis, ensuring smooth sliding of the carriage arm, and greatly improving the mechanism for preventing printing misalignment.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the proposed product, Fig. 2 is a front view of the proposed product, Fig. 3 is an enlarged sectional view showing the fixing structure at both ends of the slider shaft, Fig. 4 is an exploded perspective view, and Fig. 5 is an exploded perspective view. FIG. 6 is a front view of the conventional product and an enlarged view showing the fixing structure of the slider shaft of the conventional product. 1...Drum, 2,3...Slider shaft,
4... Carriage arm, 5a, 5b, 5c, 5
d... Ink ejection head, 6, 7, 8... Support frame, 9, 10... Holder, 9a, 10a...
Hole, 9b, 10b...Threaded hole, 9c, 10c...Threaded hole, 9f, 10f...Main screw, 9g, 9h, 1
0g, 10h...set screw, 11...adjustment ring,
11a...Cylindrical shape, 11b...Flange, 11c
...Threaded hole, 11e...Adjustment screw.

Claims (1)

[Claims for Utility Model Registration] A carriage arm equipped with an ink jetting head is mounted on two slider shafts parallel to the drum and pivotally supported at both ends by support frames so as to be slidable in the axial direction of the drum. What is claimed is: 1. An inkjet printer in which an adjustment mechanism is provided at one end of the shaft support of the slider shaft so that the slider shaft can be moved and adjusted in at least two directions orthogonal to the longitudinal direction of the shaft.