JPH09202016A - Slide guide structure - Google Patents

Abstract

(57) Abstract: A slide guide structure suitable for reciprocating a movable unit having a print head of a printer is provided. A movable chassis (2) carrying a print head (1)
Is formed into an L shape and placed on the guide shafts 6 and 7. A position regulating member 8 is provided so that the guide shaft 6 is located in the L-shaped portion of the movable chassis 2. The guide shafts 6 and 7 are moved by the pressure spring 9 to the movable chassis 2 and the position regulating member 8.
Holds elastically between and.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide guide structure suitable for reciprocating a movable unit equipped with a print head of a printer, for example.

[0002]

2. Description of the Related Art Conventionally, for example, in an ink jet recording apparatus, there is a slide guide structure for reciprocating and scanning a print head shown in a perspective view of FIG. This has a structure in which two guide shafts arranged in parallel are used, and these guide shafts are slid by an annular bearing provided in the movable unit.

In the figure, a print head 1 is mounted on a movable chassis 2, and ink supplied from an ink tank 3 from a nozzle 11 formed in the print head 1 controls a printed circuit board 4 for control. And eject. Two guide shafts 6 and 7 arranged in parallel are inserted in an annular bearing 10 provided in the movable chassis 2. By reciprocating the movable units in parallel along the guide shafts 6 and 7, , Scan against the recording paper.

[0004]

However, in the above-mentioned conventional structure, a clearance is required between the guide shaft and the bearing for assembling the guide shaft and the bearing wears as the movable unit reciprocates. However, the clearance is further increased.

Therefore, as shown in the front view of FIG. 6, the movable unit is inclined, and the dot position a in the forward path indicated by arrow A is indicated.
And the dot position b on the backward path indicated by arrow B is different, and the print quality is degraded. Further, there is a problem in that the degree of wear of the bearings at both ends of the movable unit is different, so that the head rattles and the reciprocating operation is not smoothly performed.

[0006]

In order to solve this problem, the present invention provides a movable unit in which at least a part of the bottom surface is formed in an L shape, and the movable unit is movably mounted along its axial direction. The two guide shafts arranged in parallel with each other and one of the guide shafts are in contact with the L-shaped portion of the movable unit, and the remaining guide shafts are also in contact with the movable unit, and the position of the movable unit with respect to the guide shaft is A position regulating member for regulating the guide shaft, and the position regulating member and the movable unit elastically sandwich the guide shaft.

As a result, even if the bottom surface of the movable unit is worn by repeated movements of the movable unit, a slide guide structure that does not rattle and can achieve stable operation is realized.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is a movable unit in which at least a part of the bottom surface is formed in an L shape, and the movable unit is movably mounted along the axial direction thereof. Two guide shafts arranged in parallel with each other and one of the guide shafts abuts on the L-shaped portion of the movable unit, and the remaining guide shaft also abuts on the movable unit, so that the position of the movable unit with respect to the guide shaft is adjusted. A position regulating member for regulating, wherein the position regulating member and the movable unit are configured to elastically sandwich the guide shaft, thereby repeating the movement of the movable unit. Thus, even if the bottom surface of the movable unit is worn, stable operation can be obtained without rattling.

Embodiments of the invention described in claim 1 of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a side view of the slide guide structure of the present invention when applied to an ink jet recording apparatus, and FIG. 2 is a bottom view thereof. doing.

The movable chassis 2 is different from the conventional structure.
Instead of mounting a bearing on the guide shaft, it is bent into an L shape and placed on the guide shafts 6, 7. On the lower surface of the movable chassis 2, a sliding member 5 made of acetal resin or the like having a high sliding property is provided at a portion abutting the guide shafts 6 and 7 so as to have good wear resistance and to be able to slide smoothly. ing.

A position regulating member 8 is provided from below the guide shafts so as to sandwich the guide shafts 6 and 7. This is made of acetal resin, which is a highly slidable material, like the sliding member 5. ing. This position regulating member 8
Is angled so that the guide shaft 6 comes into contact with the sliding member 5 provided at the L-shaped corner of the movable chassis 2, and the guide shaft 7 comes into contact with the bottom surface of the movable chassis 2. Regulated to. Further, the position restricting member 8 is biased by a pressure spring 9 provided on a pin 12 protruding from the movable chassis 2 so as to elastically sandwich the guide shafts 6 and 7 with the movable chassis 2. There is.

According to this structure, even when the sliding member 5 and the position regulating member 8 are worn due to friction with the guide shafts 6 and 7, as the reciprocating motion of the movable unit is repeated, the position of the movable chassis 2 and the position of the movable chassis 2 is reduced. The regulating member 8 is always biased by the pressure spring 9 so as to elastically sandwich the guide shafts 6 and 7, so that no clearance is generated. Therefore, the print head 1 does not rattle due to the reciprocating operation, the dot positions recorded by the print head 1 do not differ between the forward pass and the return pass, and the print quality does not deteriorate.

Since the movable unit gradually moves due to the abrasion of the sliding member 5 and the position regulating member 8, the recording position of the print head 1 also moves accordingly. However, as described above, the reciprocating dot positions of the print head 1 are not different, and the writing position is only slightly changed, so that the print quality is not affected.

Incidentally, FIG. 3 shows L formed on the movable chassis 2.
The shape of the character portion and the shape obtained by deforming the shape of the movement restricting member 8 in accordance with the shape are shown. Further, FIG. 4 shows a structure in which the position regulating member 8 is made of an elastic material, the pressure spring is eliminated, and the print head 1 is arranged downward.

[0015]

As described above, according to the slide guide structure of the present invention, it is not necessary to provide a clearance with the guide shaft during assembly, and the position of the movable unit is restricted with respect to the guide shaft. Since it is always elastically urged, the unit does not rattle even if it is worn due to repeated reciprocating motions.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration example of a slide guide structure according to an embodiment of the present invention.

FIG. 2 is a bottom view showing the slide guide structure.

FIG. 3 is a side view showing another configuration example of the slide guide structure.

FIG. 4 is a side view showing another configuration example of the slide guide structure.

FIG. 5 is a perspective view showing a conventional slide guide structure.

FIG. 6 is a sectional view showing the slide guide structure.

[Explanation of symbols]

 1 Print Head 2 Movable Chassis 3 Ink Tank 4 Control Printed Circuit Board 5 Sliding Member 6, 7 Guide Shaft 8 Position Limiting Member 9 Pressure Spring 10 Bearing 11 Nozzle 12 Pin

Claims (1)

[Claims] 1. A movable unit having at least a part of a bottom surface formed in an L shape, two guide shafts arranged in parallel with each other for movably mounting the movable unit along an axial direction thereof, One of the guide shafts comes into contact with the L-shaped portion of the movable unit, and the remaining guide shaft also comes into contact with the movable unit, and a position regulating member that regulates the position of the movable unit with respect to the guide shaft is provided. A slide guide structure, wherein the movable unit is configured to elastically sandwich the guide shaft.