JP3053956U - Guide shaft fixing device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To securely fix a guide shaft at low cost. SOLUTION: Both ends 2a, 2b of a guide shaft 2 for movably guiding a carriage are supported by both support plates 28, 29.
A guide shaft fixing device for fixing the annular groove 3 at one end 2a of the guide shaft 2 and one side 3a of the annular groove 3 as a tapered surface 37;
The annular groove 3 is engaged with the through hole 5 penetrating the one support plate 28, the wire 10 is fitted between the tapered surface 37 and the one support plate 28, and the other end 2 b of the guide shaft 2 is It is movably inserted into a through hole 38 penetrating the other support plate 29.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a guide shaft fixing device for movably guiding a moving body such as a print head mounting carriage of an ink jet printer.

[0002]

[Prior art]

 Conventionally, an example of this type of guide shaft fixing device is disclosed in Japanese Patent Publication No. 7-73932. As shown in FIGS. 5 and 6, an end of a guide shaft 2 for movably guiding the carriage 1 is inserted into a through hole 5 formed through a support plate 4, and the support plate at the end is inserted. The center loop portion 6a of the torsion coil spring 6 is fitted into an annular groove 3 formed at a portion protruding outward from the support plate 4, and both ends of the torsion coil spring 6 are engaged with the engagement holes 7 through the support plate 4. Is engaged. Reference numeral 8 denotes a guide bar parallel to the guide shaft 2, and a protrusion 1a projecting from the carriage 1 is movably abutted.

In the above configuration, the carriage 1 is reciprocated along the guide shaft 2 and the guide bar 8, and printing is performed on paper (not shown) by a printing unit provided on the carriage 1.

In the above configuration, the guide shaft 2 is pushed down and fixed by the central loop portion 6 a of the torsion coil spring 6, but the end of the guide shaft 2 is movably fitted into the through hole 5 of the support plate 4. Therefore, the guide shaft 2 is easily moved along the axial direction due to the load when the carriage 1 is reciprocated, and there is a possibility that the moving speed of the carriage 1 becomes unstable and printing is shifted. .

In order to solve the above problem, as shown in FIGS. 7 and 8, an annular groove 3 formed at the end of the guide shaft 2 is connected to the large-diameter hole 5a of the through-hole 5 from the small-diameter hole 5b. The center portion of the spring wire 10 is fitted between the one side surface 3 a of the annular groove 3 and the support plate 4, and both ends of the wire 10 are engaged with the support plate 4 to form an annular shape. It is conceivable that the other side surface 3b of the groove 3 is brought into contact with the support plate 4 so that the guide shaft 2 is not moved along the axial direction.

[0006]

[Problems to be solved by the invention]

 In the above configuration, since one side surface 3a of the annular groove 3 is formed along a direction orthogonal to the axial direction of the guide shaft 2, a slight gap α is generated between the one side surface 3a and the wire 10. Accordingly, the guide shaft 2 is likely to be vibrated along the axial direction thereof due to the load when the carriage 1 is reciprocated, and there is a possibility that the moving speed of the carriage 1 becomes unstable and printing is shifted. is there.

[0009] Therefore, as shown in FIG. 9, it has been considered to fix the end of the guide shaft 2 to the support plate 4 with screws 11, but in this case, the guide shaft 2 must be securely fixed. Although it is possible, the end face of the guide shaft 2 needs to be threaded, and the manufacturing cost is high.

The present invention has been made in view of the above-described problems, and has as its object to provide a guide shaft fixing device that can securely fix a guide shaft at low cost.

[0009]

[Means for Solving the Problems]

 To achieve the above object, an invention according to claim 1 is a guide shaft fixing device for fixing a guide shaft for movably guiding a movable body to a support plate, wherein an annular groove is provided at one end of the guide shaft. Is formed, and one side surface of the annular groove is formed into a tapered surface, the annular groove is engaged with a through hole provided through the support plate, and a wire is inserted between the tapered surface and the support plate. It is characterized by being.

According to the above configuration, after the annular groove formed at one end of the guide shaft is engaged with the through hole of the support plate, the gap between the support plate and the tapered surface formed on one side surface of the annular groove is formed. By inserting a wire into the support, the other side surface of the annular groove is pressed against the support plate, and the support plate is sandwiched between the other side surface and the wire, thereby securely fixing the guide shaft to the support plate. Can be.

Further, when the annular groove is formed, the tapered surface can also be formed at the same time, so that the manufacturing cost can be reduced to the same extent as the conventional case.

According to a second aspect of the present invention, in the first aspect of the present invention, a large-diameter hole having a diameter larger than that of the guide shaft and a small-diameter hole having a diameter smaller than the guide shaft communicate with each other. That is, one end of the guide shaft is inserted into the large-diameter hole, and the annular groove is engaged with the small-diameter hole.

According to the above configuration, the annular groove formed at one end of the guide shaft can be formed simply by inserting one end of the guide shaft into the large-diameter hole of the through hole and moving it toward the small-diameter hole. One end of the guide shaft can be locked to the support plate by engaging with the small diameter hole of the through hole.

According to a third aspect of the present invention, in the device according to the first or second aspect, in a state where an annular groove is engaged with the small-diameter hole, an interval from the support plate to an inner peripheral edge of the tapered surface is set to be equal to the distance. The outer diameter of the wire is set to be smaller than the outer diameter of the wire, and the distance from the support plate to the outer peripheral edge of the tapered surface is set to be larger than the outer diameter of the wire.

According to the above configuration, the wire fitted between the support plate and the tapered surface of the annular groove is securely brought into contact with the tapered surface, and one end of the guide shaft is firmly fixed to the support plate. Can be specified.

According to a fourth aspect of the present invention, in the device according to any one of the first to third aspects, the other end of the guide shaft is movably inserted into a through hole formed through the support plate. It is characterized by:

According to the above configuration, expansion and contraction of the guide shaft due to a temperature change can be absorbed between the other end and the through hole of the support plate.

The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the moving body is a carriage for mounting a print head of a printer.

According to the above configuration, since the guide shaft is not vibrated along the axial direction due to the load when the carriage is reciprocated, the moving speed of the carriage is constant, and printing by the print head can be performed precisely. It can be carried out.

[0020]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show an ink jet printer having a guide shaft fixing device according to an embodiment of the present invention, in which a housing 13 having a paper feed port 13a and a paper discharge port 13b is provided. A paper feed roller 14, a feed roller 15, a paper discharge roller 16, and a printing unit 17 are provided, a paper feed tray 18 is disposed in a paper feed port 13a, and a paper guide plate 19 is fixed to a rear portion of the housing 13. ing.

The paper feed tray 18 is rotatably supported by a pair of protrusions 13 c and 13 d of the housing 13 via support shafts 18 a protruding from upper ends of both side surfaces thereof. The paper feed tray 18 is separated from the paper feed roller 14 against the spring 20 by rotating the open / close lever 21 provided on one of the protrusions 13c. The state is locked.

In the above-described configuration, for example, A4 size paper P is supplied between the fixed guide 22 and the movable guide 23 attached to the paper feed tray 18, the lock by the opening / closing lever 21 is released, and The sheet of paper P is brought into contact with the sheet feeding roller 14 and the sheet feeding roller 14 is rotated, whereby only one sheet of the sheet P can be sent out from the sheet feeding tray 18.

Pressing rollers 24 and 25 are in contact with the feed roller 15 and the discharge roller 16, respectively. By rotating both rollers 15 and 16 together, the paper is fed out from the paper feed tray 18. The discharged paper P is discharged from the discharge port 13b.

The printing unit 17 includes a guide plate 27 disposed in a direction perpendicular to the moving and feeding direction a of the paper P, and a pair of support plates 28 that are bent at right angles from both ends of the guide plate 27 and extend forward. 29, a guide shaft 2 provided between the support plates 28, 29, an ink tank 30 and a print head mounted on a carriage (moving body) 1 movably guided by the guide shaft 2 and the guide plate 27. 31; a platen 32 facing the print head 31; a timing belt 35 wound around pulleys 33 and 34 provided at the left and right ends of the guide plate 27 and connected to the carriage 1 by the connector 1b; And a drive motor 36 that reciprocates the carriage 1 via the timing belt 35 by rotating the drive motor 33 forward and backward. 6, the print head 31 prints on the paper P passing below the carriage 1 while the carriage 1 is reciprocated.

As shown in FIGS. 3 and 4, an annular groove 3 is formed at one end 2 a of the guide shaft 2, and one side surface 3 a of the annular groove 3 is formed as a tapered surface 37 which expands outward. A through hole 5 penetrating through one of the support plates 28 is composed of a large diameter hole 5a having a diameter larger than the guide shaft 2 and a small diameter hole 5b smaller than the guide shaft 2 communicating with each other. Just by inserting the one end 2a into the large diameter hole 5a and moving it toward the small diameter hole 5b, the annular groove 3 is engaged with the small diameter hole 5b, and the one end 2a of the guide shaft 2 is connected. It can be locked to one support plate 28.

The center portion of the spring wire 10 is fitted between the tapered surface 37 and one of the support plates 28, and both ends of the wire 10 are cut and raised pieces 28 a, 28b (see FIG. 1), the distance h from one support plate 28 to the inner peripheral edge of the tapered surface 37 is set to be smaller than the outer diameter D of the wire 10 and the tapered surface 37 Is set to be larger than the outer diameter D of the wire 10, whereby the wire 10 is reliably brought into contact with the tapered surface 37.

According to the above configuration, after the annular groove 3 formed at the one end 2 a of the guide shaft 2 is engaged with the through hole 5 of the one support plate 28, one side of the support plate 28 and the annular groove 3 3a, the wire 10 is fitted between the tapered surface 37 and the tapered surface 37. The tapered surface 37 is pressed by the wire 10 and the lifting force F1 of the pressing force F prevents the guide shaft 2 from floating. The other side surface 3b of the annular groove 3 is pressed against one of the support plates 28 by the lateral component F2, whereby the one support plate 28 is sandwiched between the wire 10 and the other side surface 3b of the annular groove 3. And the guide shaft 2 can be securely fixed to the one support plate 28. Accordingly, the guide shaft 2 is not vibrated along its axial direction due to the load when the carriage 1 is moved back and forth, the moving speed of the carriage 1 is kept constant, and printing by the print head 31 is performed precisely. Can be done.

Further, when the annular groove 3 is formed, the tapered surface 37 can be formed at the same time, so that the manufacturing cost can be reduced to about the same level as in the related art.

As shown in FIG. 3, the other end 2 b of the guide shaft 2 is movably fitted into a circular through hole 38 penetrating the other support plate 29, and the guide shaft 2 expands and contracts due to a temperature change. Can be absorbed between the other end 2b and the through hole 38 of the other support plate 29.

[0030]

[Effect of the invention]

 According to the invention of claim 1, after the annular groove formed at one end of the guide shaft is engaged with the through hole of the support plate, the support plate and the tapered surface formed on one side surface of the annular groove are formed. The other side surface of the annular groove is pressed against the support plate by fitting the wire between the support plates, and the support plate is sandwiched between the other side surface and the wire, thereby securely fixing the guide shaft to the support plate. be able to.

Further, when the annular groove is formed, the tapered surface can be formed at the same time, so that the manufacturing cost can be reduced to the same extent as the conventional case.

According to the invention of claim 2, the guide shaft is formed at one end of the guide shaft simply by inserting one end of the guide shaft into the large-diameter hole of the through hole and moving the guide shaft toward the small-diameter hole. By engaging the annular groove with the small diameter hole of the through hole, one end of the guide shaft can be locked on the support plate.

According to the third aspect of the present invention, the wire fitted between the support plate and the tapered surface of the annular groove is securely brought into contact with the tapered surface, and one end of the guide shaft is connected to the support plate. Can be fixed firmly.

According to the present invention, expansion and contraction due to a temperature change of the guide shaft can be absorbed between the other end and the through hole of the support plate.

According to the invention, since the guide shaft is not vibrated along the axial direction due to the load when the carriage is reciprocated, the moving speed of the carriage is constant, and Printing can be performed precisely.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an ink jet printer including a guide shaft fixing device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway plan view of the same.

FIG. 3 is an enlarged vertical sectional view of the main part.

FIG. 4 is a side view of the main part.

FIG. 5 is a perspective view showing an example of the related art.

FIG. 6 is a side view of the same.

FIG. 7 is a longitudinal sectional view of a main part showing another conventional example.

FIG. 8 is a side view of the main part.

FIG. 9 is a longitudinal sectional view of a main part showing still another example of the related art.

[Explanation of symbols]

 Reference Signs List 1 carriage (moving body) 2 guide shaft 2a one end of guide shaft 2b other end of guide shaft 3 annular groove of guide shaft 3a one side surface of annular groove 3b other side surface of annular groove 5 through hole 5a large diameter hole portion 5b small diameter Hole 10 Wire 28 One support plate 29 The other support plate 31 Print head 37 Tapered surface 38 Through hole D Outer diameter of wire h Distance from one support plate to inner peripheral edge of tapered surface H One support plate to tapered surface Distance to outer edge of

Claims (5)

[Utility model registration claims] 1. A guide shaft fixing device for fixing a guide shaft for movably guiding a moving body to a support plate, wherein an annular groove is formed at one end of the guide shaft, and One side is a tapered surface,
The annular groove is engaged with a through hole provided through the support plate,
A guide shaft fixing device, wherein a wire is fitted between the tapered surface and the support plate. 2. The large diameter hole having a diameter larger than that of the guide shaft and the small diameter hole having a diameter smaller than that of the guide shaft. The one end of the guide shaft is connected to the large diameter hole. 2. The guide shaft fixing device according to claim 1, wherein the annular groove is inserted into the small-diameter hole so as to be engaged therewith. 3. An interval between the support plate and an inner peripheral edge of the tapered surface is set smaller than an outer diameter of the wire rod in a state where an annular groove is engaged with the small-diameter hole portion. The guide shaft fixing device according to claim 2, wherein an interval between the tapered surface and an outer peripheral edge is set to be larger than an outer diameter of the wire. 4. The guide shaft fixing device according to claim 1, wherein the other end of the guide shaft is movably inserted into a through hole formed through the support plate. 5. The printer according to claim 1, wherein the movable body is a carriage for mounting a print head of a printer.
The guide shaft fixing device according to any one of the above.