JPH061824Y2 - Guide rod support device for printer carriage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a printer in which a carriage having a print head mounted on a guide rod extending in parallel with a longitudinal direction of a platen is mounted, and more particularly to a carriage. The present invention relates to a guide rod supporting device.

[Prior Art] As a conventional guide rod supporting device for a carriage of a printer, the device disclosed in Japanese Patent Laid-Open No. 60-30378 is known. The device has a structure in which a carriage main body is supported by two main shafts and a rear shaft (guide rod), one eccentric bearing is provided on each of the left and right sides of the carriage main body, and the main shaft penetrates the eccentric bearings. Has been done. The rear shaft is supported by the chassis side plate (frame) at the eccentric small diameter portions at both ends. In the conventional apparatus having such a structure, the rear shaft of the carriage body is moved up and down by rotating the rear shaft, and the horizontal inclination of the carriage body is adjusted by rotating the two eccentric bearings. I am trying to do it.

[Problems to be Solved by the Invention] However, in the conventional apparatus, two shafts are required for position adjustment of the carriage body, and
Since the rotating operation is performed by the shafts whose positions are distant from each other, there is a problem that operability is poor.

The present invention has been made to solve the above problems, and an object thereof is to allow the guide rod to be accurately parallel to the platen and to adjust the interval with a simple configuration and simple operation. An object is to provide a guide rod supporting device for a carriage of a printer.

[Means for Solving the Problems] In order to achieve the above object, a guide rod supporting device for a carriage of a printer of the present invention is a guide rod extending parallel to the longitudinal direction of a platen supported by a pair of left and right frames. In a printer equipped with a carriage on which a print head is mounted, an eccentric shaft portion formed eccentrically with respect to the axis of the guide rod at both ends of the guide rod, and a fitting hole formed in each of the frames. And a pair of bearing members having a bearing hole that rotatably supports the eccentric shaft portion of the guide rod, and at least one of the pair of bearing members is rotatable with respect to the fitting hole. The bearing hole of the bearing member is formed eccentrically with respect to the rotation axis of the bearing member.

[Operation] With the above configuration, the carriage guide rod supporting device of the printer of the present invention adjusts the parallel state between the platen and the carriage by rotating the bearing member, and
By rotating the guide rod, the distance between the platen and the carriage is adjusted while maintaining the parallel state between the platen and the carriage.

[Embodiment] An embodiment of a printer embodying the present invention will be described in detail below with reference to the drawings.

In the printer of this embodiment, as shown in FIGS. 2 to 4, the lower frame 1 is formed of a synthetic resin into a substantially box shape having an open upper surface, and an upper frame 2 made of synthetic resin is formed at the upper rear portion thereof. Has been inserted. A pair of left and right fitting holes 3 is formed in the rear wall of the lower frame 1, and a pair of left and right protrusions 5 that fit into the fitting hole 3 via a rubber elastic cap 4 are formed in the rear surface of the upper frame 2. Has been done. A pair of left and right elastic cylinders 6 made of rubber are fitted to the front edge of the lower frame 1, and a screw 8 is screwed from the upper surface of the upper frame 2 to a nut 7 held at the lower end thereof. The frame 2 is detachably fixed to the lower frame 1.

A bottom cover 10 is fixed to the opening 9 provided at the bottom of the lower frame 1 by a plurality of screws, and a circuit board 11 supporting a control circuit of the printer is fixed to the upper surface of the bottom cover 10 by the screws. There is. At the right end of the front portion of the lower frame 1, a power supply unit 13 having power-related electric parts such as a transformer, a capacitor, and a switch installed therein is detachably attached. On the left side of the power supply unit 13, a front cover 14 is openably and closably mounted on the front upper part of the lower frame 1, and a transparent cover 15 is openably and closably mounted on the front upper part of the upper frame 2.

As shown in FIGS. 2 to 4, a platen 16 is rotatably supported via a bearing member 17 between the left and right side walls 2a and 2b of the upper frame 2, and an operation knob 18 is attached to the left end thereof. ing. A metal guide rod 19 is provided between the side walls 2a and 2b of the upper frame 2 in the vicinity of the platen 16.
Are extended and extend in parallel along the longitudinal direction of the platen 16. Platen 16 with the guide rod 19 in between
So that it is located on the opposite side to the side walls 2 of the upper frame 2.
A metal guide rail 20 having a substantially U-shaped cross section is provided between a and 2b, and extends in parallel with the guide rod 19.

A metallic carriage 21 is movably mounted on the guide rod 19, and a print head 22 is mounted on the upper surface thereof.

As shown in FIGS. 3 and 4, a protruding piece 23 is formed on the carriage 21 toward the guide rod 20, and an engaging body 24 is attached to the tip thereof. And the third
As shown in the figure, the engaging body 24 is engaged so as to sandwich the upper side portion of the guide rail 20 from above and below, and the carriage 2 along the longitudinal direction of the platen 16 is guided by the guide rail 20.
The movement of 1 is guided. Print head 2
A ribbon cassette 25 is detachably mounted on the upper frame 2 so as to be located on the opposite side of the platen 16 with the sheet 2 interposed therebetween. An ink ribbon 26 is housed inside the ribbon cassette 25, and a part of the ink ribbon 26 comes out of the ribbon cassette 25 and is arranged between the platen 16 and the print head 22.

As shown in FIG. 4, a metal support plate 27 is attached to the lower right portion of the upper frame 2, a platen drive motor 28 is supported on the right side surface thereof, and a carriage drive motor 29 is attached to the lower surface thereof. Is supported. And
When the platen drive motor 28 is rotated, the platen 16 is rotated in either forward or reverse directions through the reduction gear mechanism 30 to feed the printing paper on the platen 16.
When the carriage drive motor 29 is rotated,
The carriage 21 is moved to the left or right in the longitudinal direction of the platen 16 via a reduction gear mechanism (not shown), a toothed pulley 31, and a toothed belt 32.
The upper print head 22 prints on the print paper on the platen 16 via the ink ribbon 26. Further, when the carriage driving motor 29 is rotated, the ribbon feed shaft 33 on the ribbon cassette 25 is rotated in one direction via a reduction gear mechanism (not shown), and the ink ribbon 26 is fed by a predetermined amount. .

Next, the support device for the guide rod 19, which is the main part of the present invention, will be described. As is apparent from FIGS. 1 and 5 to 9, the upper frame 2 includes the platen 1
6 and a bottom wall 2c located below the guide rod 19 and parallel to the guide rod 19, and left and right side walls 2a standing on both left and right ends thereof,
2b is integrally formed and has both left and right side walls 2a, 2
Each of b is composed of inner side walls 2a-1 and 2b-1 and outer side walls 2a-2 and 2b-2 spaced apart from the inner side walls 2a-1 and 2b-1. The inner and outer both side walls are connected to each other at the upper end and open at the lower end.

A fitting hole 41 is formed in each of the inner side walls 2a-1 and 2b-1, and a fitting hole 4 is formed in the outer side wall 2a-2 of the left side wall 2a.
A through hole 42 is formed in correspondence with No. 1. Each fitting hole 41
Has a bearing member 43 made of synthetic resin on one side of the outer peripheral shaft portion 43a.
Is rotatably fitted and supported at its outer peripheral shaft portion 43a.
A bearing hole 43b extending parallel to the axis of the outer peripheral shaft portion 43a and extending on an axis that is eccentric to the axis of the outer peripheral shaft portion 43a is formed, and the engaging protrusion 43c is formed on one side of the outer periphery. Is projected.

On the other hand, eccentric shaft portions 19b are formed at both ends of the guide rod 19 so as to extend parallel to the axis of the central guide shaft portion 19a and extend on an axis eccentric to the axis, and the left eccentric shaft portions 19b are formed. A cutout portion 19c is formed in the eccentric shaft portion 19b. Further, the guide rod 19 has the eccentric shaft portions 19b at both ends having the bearing holes 43b of the both-end bearing member 43.
The eccentric shaft portion 19b is erected and supported between the bearing members 43 so as to be rotatable around its axis in a state of being fitted into the bearing member 43.
A stop ring 44 attached to the front end of the shaft holds the bearing member 43 on the same side to prevent it from coming out to the left.

A plurality of positioning recesses which are located on the outer periphery of each of the fitting holes 41 and which can be engaged with the engaging protrusions 43c on each of the bearing members 43 on the outer surfaces of both inner side walls 2a-1 and 2b-1 of the upper frame 2. 45
Are formed respectively. The positioning concave portion 45 and the engaging projection 43c constitute a positioning means 46, and each bearing member 43 is rotationally adjusted at the time of assembly to engage the engaging projection 43c with the arbitrary positioning concave portion 45. The guide shaft 19a of the guide rod 19 is aligned with the platen 16 by positioning the guide shaft 19a at a predetermined rotation position.
It can be adjusted to be parallel to the axis of.

An operating member 47 made of synthetic resin is fitted and fixed to the tip of the left eccentric shaft portion 19b of the guide rod 19 so as to project outward from the through hole 42 on the left outer wall 2a-2 of the upper frame 2. Around the outer periphery thereof, there are formed a restriction recess 47a for restricting the rotation range and a plurality of holding recesses 47b for holding and setting at a predetermined rotation position. As shown in FIG. 5, an index 48 corresponding to the thickness of the printing paper is provided on the outer surface of the left outer wall 2a-2 of the upper frame 2 so as to face the operation member 47, and the operation member 47 is operated in accordance with the instruction of the index 48. Can be rotated.

As shown in FIGS. 1, 5, 6 and 8, a holding member 49 made of synthetic resin is attached between the inner and outer side walls of the left side wall 2a of the upper frame 2 in the vicinity of the operating member 47. Each holding member 49 integrally has a locking claw 49b on the upper surface of one end, a stacking portion 49c on the lower surface of the same end, and a locking piece 49a on the upper surface of the other end. A pair of arms 5 is provided on the upper surface of the other end.
0 is projectingly formed, and a restricting protrusion 50a for restricting the rotation of the operating member 47 within a predetermined range is engaged at the tip of one arm 50 with the restricting recess 47a of the operating member 47. While being formed, the other end of the arm 50 is selectively engaged with the holding recess 47b of the operating member 47,
A holding projection 50b for setting and holding the operation member 47 at a predetermined rotation position is formed to project. The holding projection 51b on the holding member 49 and the holding recess 47b on the operating member 47 constitute the holding means 51.

A U-shaped recess 2d is formed in the left side wall 2a corresponding to the operation knob 18 of the platen 16, and a wall 2e at the bottom thereof bridges the inner and outer side walls 2a-1 and 2a-2 at the lower end, It is cut out from the arc wall of the recess 2d. Holding member 4
Reference numeral 9 removably hooks the locking claw 49b and the hooking piece 49a on both ends of the wall 2e, and positions the pair of arms 50 corresponding to the operation member 47 as described above.

On the other hand, as shown in FIG. 5, the bearing member 17 for supporting the platen 16 has a U-shaped cutout 2 on the side walls 2a and 2b.
It has a pair of flanges 17a and 17b so as to sandwich the peripheral edge of f, and at one lower part thereof, a projecting piece 53 which inserts an insertion hole 52 formed at the bottom of the recess 2d is integrally formed, and the lower end thereof is formed. An engaging shaft locking claw 54 is formed on the lower surface opening edge of the insertion hole 52 so as to be removable. In this embodiment, with the holding member 49 adhered to the lower surface of the upper frame 2, one side portion of the holding member 49 is disposed so as to face the lower end of the projecting piece 53, and the projecting piece 53 is shown in FIG. It is configured to move in the direction of the arrow to prevent the latching claw 54 from being disengaged from the engaged state.

Now, in the printer configured as described above, after the platen 16 is assembled to the upper frame 2, the guide rod 1
When both ends of 9 are installed and assembled, both inner side walls 2a-
1 and 2b-1 through the fitting holes 41, and then the bearing holes 43b of the bearing member 43 are fitted to both ends of the guide rod 19 and the outer peripheral shaft portion 43a of the bearing member 43 is fitted into the fitting hole 41.
To fit. In this state, both the bearing members 43 are pivotally adjusted and positioned at a predetermined position by the engagement of the engagement protrusion 43c with the optional positioning recess 45.
The axis of b can be specially moved so that the axis of the guide shaft portion 19a can be prepared and accurately adjusted to be parallel to the axis of the platen 16.

The right end of the guide rod 19 is retained by the stop ring 44 with the bearing member 43 interposed between the right end and the inner wall 2b-1 at the right end. The bearing member 43 on the left side is pressed and held by the inner side wall 2a-1 on the inside by the side surface of the arm portion 50 by attaching the holding member 49 to the wall 2e as described above. The operating member 47 is fitted to the end of the guide rod 19 from the outside of the frame 2 through the through hole 42. Upper frame 2
The lower surface of the is also covered with the holding member 49 by the lower frame 1. When the guide rod 19 becomes hot due to friction with the carriage 21 or the temperature changes when the printer is used, the difference in thermal expansion between the guide rod 19 and the frame 2 is due to the eccentric shaft portion 19b of the guide rod 19 on the left side. It is absorbed by sliding the bearing member 43 in the axial direction. For this reason, the eccentric shaft portion 19b on the left side is formed sufficiently long to a position separated from the inner side wall 2a-1 inward as shown in FIG.

When the thickness of the printing paper on the platen 16 changes when the printer is used, the operating member 47 is rotated according to the support of the index 48 corresponding to the thickness of the printing paper,
When the holding recess 47b and the arbitrary holding projection 50b are engaged and set and held at a predetermined position, the guide rod 19 is rotated about the axis of the eccentric shaft portion 19b, and the axis of the guide shaft portion 19a is changed. The platen 16 is moved toward or away from the axis of the platen 16 while being parallel to the axis. Therefore, the print portion of the print head 22 is arranged at a position spaced from the surface of the print paper by a predetermined distance, and uniform printing can be performed in that state. In addition, when the operation member 47 is rotated, the restriction recess 4 is formed.
Since the rotation of the operating member 47 is restricted within a predetermined range by the engagement of the regulating projection 50a on the holding member 49 with 7a, the rotation setting position of the operating member 47 does not get out of order.

The invention is not limited to the configuration of the above-described embodiment, and the configurations of the respective parts can be arbitrarily modified and embodied without departing from the spirit of the invention.

[Advantages of the Invention] As described in detail above, the guide rod supporting device for the carriage of the printer according to the present invention adjusts the parallel state between the platen and the carriage by rotating the bearing member and rotates the guide rod. Since the distance between the platen and the carriage is adjusted while maintaining the parallel state between the platen and the carriage by the dynamic operation, the guide rod can be accurately parallel to the platen with a simple configuration and simple operation. The spacing can be adjusted.

[Brief description of drawings]

FIG. 1 is a partially exploded perspective view showing a guide rod supporting device for a carriage in a printer embodying the present invention.
FIG. 2 is a perspective view showing the entire printer, FIG. 3 is a longitudinal sectional view of a main part of the printer, and FIG. 4 is a partial horizontal sectional view of the same.
5 is a partial exploded perspective view showing the mounting structure of the bearing member for the platen, FIG. 6 is a partial bottom view showing the supporting device portion of the guide rod in an enlarged manner, and FIG. 7 is a line AA of FIG. Partial sectional view, FIG. 8 is a partial sectional view taken along the line BB in FIG. 6, and FIG. 9 is a partial sectional view taken along the line CC in FIG. In the figure, 2 is a frame, 16 is a platen, 19 is a guide rod, 21 is a carriage, 22 is a print head, 41 is a fitting hole, 43 is a bearing member, and 43b is a bearing hole.

Claims (1)

[Scope of utility model registration request] 1. A carriage (21) having a print head (22) mounted on a guide rod (19) extending parallel to the longitudinal direction of a platen (16) supported by a pair of left and right frames (2). In a mounted printer, an eccentric shaft portion (19b) formed eccentrically with respect to the axis of the guide rod (19) at both ends of the guide rod (19) and the frame (2), respectively. Mating hole (4
1) A bearing hole (43b) fitted and supported by the guide rod (19) for rotatably supporting the eccentric shaft portion (19b) of the guide rod (19).
And a pair of bearing members (43) having a pair of bearing members (43), at least one of the pair of bearing members (43) being rotatable with respect to the fitting hole (41).
A guide rod support device for a carriage of a printer, characterized in that the bearing hole (43b) of 3) is formed eccentrically with respect to the rotational axis of the bearing member (43).