JP4003049B2 - Recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recorder in which the detection accuracy of moving position in the main scanning direction is not lowered even if PG adjustment is performed by displacing a carriage and the carriage guide shaft can be grounded efficiently without increasing the number of components. <P>SOLUTION: The recorder comprising a carriage guide shaft 2 for supporting a carriage provided with a recording head section and guiding the movement thereof in the main scanning direction, a side frame 1 for bearing the guide shaft 2, and a linear scale 4, i.e., a moving position detecting means of the carriage in the main scanning direction, is further provided with a mechanism for displacing the guide shaft 2, and a holder 10 displaceable integrally with the guide shaft 2. The linear scale is fixed to the holder so that it can be displaced while being interlocked with displacement of the guide shaft 2, and the holder 10 has a function for grounding the guide shaft 2 and the side frame 1. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording apparatus typified by an ink jet printer or the like having a structure in which a carriage guide shaft and a linear scale can be displaced up and down in conjunction with each other.
[0002]
[Prior art]
In a recording apparatus such as an ink jet printer, a recording head unit including a nozzle array that ejects ink is mounted on a carriage, and the carriage reciprocates in a main scanning direction along a carriage guide shaft that is a support member. Printing on the recording material is performed. The operation of the carriage in the main scanning direction is controlled on the basis of a linear scale which is a carriage position detecting means provided in a tape shape in the main scanning direction in parallel with the carriage guide shaft (that is, in the main scanning direction). The That is, the linear scale has slits formed at equal intervals, and is performed by a linear encoder unit including an optical detection unit that optically detects the number of passing slits.
[0003]
Incidentally, the distance between the recording head portion (more specifically, the nozzle array) mounted on the carriage and the recording material (so-called paper gap, hereinafter referred to as “PG”) is the thickness of the printing paper as the recording material. However, in order to perform printing with high accuracy, it is necessary to adjust PG according to the thickness of the recording material. Here, since PG is defined by the distance between the recording head and a platen that is a sheet position regulating member provided opposite to the recording head, adjustment of PG is usually performed with respect to the recording head with respect to the platen. This is done by changing the position.
[0004]
Normally, an eccentric mechanism such as an eccentric shaft or an eccentric bush is used for the support portion of the carriage guide shaft, and the carriage guide shaft rotates around the axis of the carriage guide shaft via the eccentric mechanism (PG adjustment direction). The displacement is changed. That is, by using the eccentric mechanism, the position of the carriage guide shaft extending in the horizontal direction is changed, and the carriage is moved up and down in this manner, thereby adjusting the position of the recording head and adjusting the PG. I am trying.
[0005]
[Problems to be solved by the invention]
However, in the conventional recording apparatus, when the carriage is moved up and down, the linear scale for detecting the movement position of the carriage in the main scanning direction is fixed. It is conceivable that the position detection accuracy is impaired. Particularly in an ink jet printer, a linear scale has recently been used because the amount of carriage movement during PG adjustment tends to increase in order to maintain high print quality (high image quality) regardless of the thickness of the recording material. The importance of maintaining the detection accuracy by is increasing.
[0006]
In addition, it should be avoided that static electricity is accumulated in the carriage and / or carriage guide shaft, but since non-conductive material such as plastic is used for the eccentric mechanism, it is necessary to ground the carriage guide shaft. A dedicated grounding member is required, which is an obstacle to the number of parts and cost reduction.
[0007]
An object of the present invention is to reduce the detection accuracy of the moving position in the main scanning direction even if the PG adjustment is performed by displacing the carriage, and to increase the number of parts for grounding the carriage and / or the carriage guide shaft. It is an object of the present invention to provide a recording apparatus that can efficiently perform the operation.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, a recording apparatus according to a first aspect of the present invention includes a recording head unit that performs recording on a recording material, a carriage that can reciprocate in the main scanning direction, and a carriage that supports the carriage. And a carriage guide shaft that guides movement in the main scanning direction, a side frame that is a structural member that supports the carriage guide shaft, and a linear scale that is means for detecting the movement position of the carriage in the main scanning direction. A recording apparatus having a mechanism for displacing the carriage guide shaft, wherein the holder is engaged with the carriage guide shaft and can be displaced integrally with the carriage guide shaft, and the linear scale is mounted on the holder. By attaching, the linear scale is configured to be displaceable in conjunction with the displacement of the carriage guide shaft. A biasing member is provided between the guide frame and the biasing member. The biasing member is configured to press the retainer against the side frame, and the retainer is formed of a conductive material. And a grounding function for grounding the carriage guide shaft and the side frame.
[0009]
According to this feature, since the linear scale is attached so as to be integrally displaceable in conjunction with the displacement of the carriage guide shaft via a holder, when the carriage is moved up and down for PG adjustment, The linear scale also moves up and down together with the carriage. Therefore, since the relative position of the linear scale with respect to the carriage does not change, the accuracy of position detection in the main scanning direction of the carriage is not impaired.
[0010]
Further, since the holder has a grounding function for grounding the carriage guide shaft and the side frame, the carriage and / or the carriage guide shaft can be grounded efficiently without increasing the number of parts.
Further, since the urging member is configured to press the holding tool against the side frame, the holding tool can be firmly brought into contact with the frame, and the grounding function can be further ensured. Furthermore, the holder can be stabilized without rattling, and the integrity of the carriage guide shaft and the linear scale can be strengthened, so that even if the PG adjustment is performed, the position detection accuracy by the linear scale is kept high. be able to.
[0011]
The recording apparatus according to claim 2 of the present application is the recording apparatus according to claim 1, wherein at least one of the holders is provided with a plate spring, and the linear scale is attached to the plate spring. It is characterized by that.
According to this feature, since the linear scale is attached to the leaf spring provided in the holder, the tape-like linear scale is urged by the leaf spring and is held in a tensioned state, and the carriage in the main operation direction. The accuracy of position control can be ensured.
[0012]
Further, in the recording apparatus according to claim 3 of the present application, in the recording apparatus according to claim 1 or 2, the holding tool has an engaging portion with which the carriage guide shaft is engaged. The carriage guide shaft is engaged with the substantially semicircular engaging portion and then rotated by a predetermined amount around the axial center line. It is formed in the cross-sectional shape which cannot be pulled out with respect to the open side.
According to this feature, the assembly work of the carriage guide shaft with respect to the holder can be simplified with a simple structure, and the assembly work efficiency can be improved.
[0015]
A recording apparatus according to a fourth aspect of the present invention is the recording apparatus according to any one of the first to third aspects, wherein a positioning portion in the height direction of a linear scale is formed on the holder. Features.
[0016]
According to this feature, since the positioning part in the height direction of the linear scale is formed in the holder, it is possible to prevent a slight shift in the height direction of the linear scale and to ensure the relative position with respect to the carriage with high accuracy. it can.
[0017]
According to a fifth aspect of the present invention, in the recording apparatus according to any one of the first to fourth aspects, the movement of the holder is guided along a locus that coincides with the displacement locus of the carriage guide shaft. A guide structure is provided.
[0018]
According to this feature, since the guide structure guides the movement of the holder along a trajectory that matches the displacement trajectory of the carriage guide shaft, the trajectory of movement of the carriage guide shaft and the trajectory of movement of the holder always match. As a result, the loci of the displacement of the carriage and the linear scale also coincide. Therefore, the relative position of the linear scale with respect to the carriage can always be maintained in the same state.
[0019]
A recording apparatus according to a sixth aspect of the present invention is the recording apparatus according to the fifth aspect, wherein the guide structure includes a protrusion formed on the holder, the protrusion capable of being fitted therein, and the carriage. And a guide hole provided in the side frame in a shape coinciding with the displacement locus of the guide shaft.
[0020]
According to this feature, the guide structure employs an engagement structure between the protrusion formed on the holder and a guide hole having a shape that matches the displacement trajectory of the carriage guide shaft, so the structure is simple and installation is easy. In addition, since the guide hole has a shape that matches the displacement locus of the carriage guide shaft, the projection can be reliably guided along the same locus. In addition, the holder can be reliably guided by providing the guide hole in the side frame which is a structural member having high strength.
[0021]
According to a seventh aspect of the present invention, there is provided a recording apparatus according to the sixth aspect, wherein the projection is provided with a retaining action portion for preventing the projection from coming out of the guide hole of the side frame. It is characterized by that.
[0022]
According to this feature, the protrusion is provided with a retaining portion for preventing the protrusion from coming out of the guide hole of the side frame, so that the protrusion can be prevented from coming off from the guide hole, and the holder can be securely attached. Can be guided to.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view of a main part of an embodiment of a recording apparatus according to the present invention, in which a holder is mounted, and FIG. 2 is a cross-sectional view of the main part around the holder in FIG.
[0024]
The carriage guide shaft 2 is supported on the left and right side frames 1 via an eccentric mechanism 30 so as to be displaced in the vertical direction. Although an eccentric shaft can be adopted as the eccentric mechanism 30, an eccentric bush is used as the eccentric mechanism 30 here. By using the eccentric bush, a shaft body having a concentric cross section can be used as the carriage guide shaft 2, and the displacement distance of the carriage guide shaft 2 can be increased without increasing the diameter of the carriage guide shaft 2 itself. Therefore, it becomes possible to widen the displacement width of the carriage, and the degree of freedom of PG adjustment is increased.
[0025]
In the present invention, the shape of the holder 10 is arbitrary as long as the carriage guide shaft 2 and the linear scale 4 can be interlocked. In this aspect, a flat plate-like member is used, and the holder 10 is formed to be slightly wider. The lower part engages with the carriage guide shaft 2 and the upper part is provided with a mounting part 13 for the linear scale 4. The middle part of both parts rises from the lower side to the upper side substantially vertically and comes into contact with the wall surface of the side frame 1. have.
[0026]
As shown in FIGS. 7A and 7B, the holder 10 has a substantially semicircular shape corresponding to the outer periphery of the small-diameter shaft 3 of the carriage guide shaft 2 at the engaging portion 70 with the carriage guide shaft 2. A bearing-shaped portion is provided, and the small-diameter shaft 3 having a substantially D-shaped cross section of the carriage guide shaft 2 is engaged with the carriage guide shaft 2 so as to be fitted to the bearing-shaped portion (engaging portion 70). FIGS. 7A and 7B are side views as seen from the right direction in FIG. 2, and the eccentric mechanism 30 and the side frame 1 are not shown for easy understanding. The bearing-shaped portion (engagement portion 70) of the holder 10 is larger than the outer periphery of the small-diameter shaft 3 of the carriage guide shaft 2 to the extent that the rotation of the carriage guide shaft 2 is not hindered, and the carriage guide shaft 2 is being displaced. The holder 10 is formed so as to move in synchronization with the carriage guide shaft 2 without detaching.
[0027]
That is, in the holder 10, the engaging portion 70 with which the carriage guide shaft 2 engages is formed in a partially open substantially semicircular shape that can be engaged from the outer edge side of the holder 10. Is engaged with the substantially semi-circular engaging portion 70, and then rotated by a predetermined amount around the axial center line (from the state (A) to the state (B) in FIG. 7) with respect to the open side. It is formed in a cross-sectional shape that cannot be removed. Specifically, the minimum length passing through the center of the small-diameter shaft 3 having a substantially D-shaped cross section of the carriage guide shaft 2 is h1, the diameter of the small-diameter shaft 3 is h2, and the minimum dimension of the entrance to the engaging portion 70 is h3. The magnitude relationship between them is set as follows.
h1 <h3 <h2
Therefore, the assembly work of the carriage guide shaft 2 with respect to the holder 10 can be simplified with a simple structure, and the assembly work efficiency can be improved.
[0028]
Further, the holder 10 is made of a conductive material and has a grounding function for grounding the carriage guide shaft 2 and the sheet metal side frame 1. In this embodiment, as indicated by an arrow 60 in FIG. 2, the side frame 1 is discharged from the carriage guide shaft 2 through the holder 10. Accordingly, the carriage and / or the carriage guide shaft 2 can be grounded efficiently without using a dedicated grounding member, that is, without increasing the number of parts.
[0029]
As shown in FIG. 2, a disc spring 51 is sandwiched between the engaging portion 70 of the holder 10 and the carriage guide shaft 2, and urges the holder 10 to be pressed against the side frame 1. ing. Specifically, a disc spring 51 serving as an urging member is provided between a boundary portion of the carriage guide shaft 2 that is reduced in diameter to the small diameter shaft 3 and the holder 10, and the small diameter shaft 3 of the carriage guide shaft 2 is The disc spring 51 is configured to press the holder 10 against the side frame 1 by its elastic force in a state where it is pivotally supported by the side frame 1.
[0030]
Since the disc spring 51 is configured to press the holding tool 10 against the side frame 1 in this way, the holding tool 10 can be firmly brought into contact with the side frame 1, and the grounding function of the holding tool 10 can be achieved. It can be made more reliable. Furthermore, the holder 10 can be stabilized without rattling, and the integrity of the carriage guide shaft 2 and the linear scale 4 can be strengthened. Therefore, even if PG adjustment is performed, the position detection accuracy by the linear scale 4 can be improved. Can be kept high.
[0031]
In addition, the shape of the peripheral holder 10 that engages with the carriage guide shaft 2 is formed in a substantially U-shaped cross section, and the upper and lower sides of the inverted U-shape are in contact with the side frame 1. However, the plate-shaped plane around the engaging portion is formed with a spaced-apart portion 11 so as to be separated from the wall surface of the side frame 1. By this separated shape portion 11, the load on the carriage guide shaft 2 is relieved to the side frame 1 so as to straddle the eccentric mechanism 30 fitted to the side frame 1, and the load on the eccentric mechanism 30 is reduced. ing.
[0032]
That is, the carriage guide shaft 2 is subjected to a horizontal load caused by the reciprocating movement of the carriage in the main scanning direction, and a vertical load caused by the carriage's own weight and the vertical displacement by the eccentric mechanism 30. Since the shaft 2 is concentrated on the eccentric mechanism 30 that supports the shaft 2 at both ends, the load on the eccentric mechanism 30 is reduced by releasing the load to the side frame 1 that is a structural member by the separated shape portion 11 of the holder 10. is doing.
[0033]
The attachment portion 13 of the linear scale 4 is substantially perpendicular to the flat surface of the holder 10 at the upper part of the holder 10 mounted so as to rise from below (that is, in parallel with the tape-like linear scale 4). A so-called hook-shaped hook 14 for engaging the linear scale 4 is formed by bending a portion of the bent mounting portion approximately twice at a substantially right angle. . The linear scale 4 is attached so that the hook portion 14 is hooked into the engagement hole at the end of the linear scale 4.
[0034]
FIG. 3 is a perspective view of a principal part showing a state of the holder 10 attached to the side frame 1 portion on the opposite side to FIG. 1 in the recording apparatus of the same embodiment. The basic configuration of the holder 10 is shown in a simplified manner in FIG. 3, but includes the grounding function of the holder 10, the substantially semicircular engaging portion 70, and the disc spring 51, and FIG. It is the same as that of FIG. The holder 10 is also formed using a plate-like member, and is provided with a spaced-apart portion 11 (on this side, which is substantially U-shaped in cross section) at a lower portion, and a carriage guide at this portion. The shaft 2 is engaged. In FIG. 3, unlike FIG. 1, the linear scale 4 is not directly attached to the holder 10, but is attached to a leaf spring 20 attached to the holder 10. That is, an opening hole is formed near the center of the holder 10, and the leaf spring 20 is inserted into the opening hole.
[0035]
The leaf spring 20 is locked to the holder 10 by means (not shown) in the lower part, and is attached to be displaceable up and down along the same locus as the carriage guide shaft 2 and the holder 10. On the upper part of the leaf spring 20, there is provided a mounting portion for the linear scale 4 formed by being bent so as to be substantially perpendicular to the flat plate surface of the leaf spring 20 (that is, parallel to the tape-like linear scale 4). 1 and a linear scale 4 mounting flange is formed in the same manner as the linear scale 4 mounting section 13 in FIG. 1, and the hook is hooked into the engagement hole at the end of the linear scale 4; A linear scale 4 is attached.
[0036]
Thus, the attachment part of the linear scale 4 is provided in the leaf | plate spring 20 inserted in the holder 10, and the tension | tensile_strength is provided using the urging | biasing force of the leaf | plate spring 20 by attaching the linear scale 4 to this attachment part. The linear scale 4 can be held. In this embodiment, the leaf spring 20 is formed as a separate part from the holder 10, but a part of the holder 10 can be elastically deformed to obtain the same urging action as the leaf spring 20.
[0037]
The upper part of the holder 10 in FIG. 3 is bent so as to be substantially perpendicular to the flat plate surface of the holder 10 (that is, so as to be parallel to the tape-like linear scale 4). Directional positioning part 15 is provided. In the positioning portion 15 provided by bending, a protruding piece 16 is formed by further bending a part thereof at a substantially right angle. By inserting the protruding piece 16 into a height positioning hole provided in the linear scale 4, The height of the linear scale 4 can be defined so that the vertical position does not shift.
[0038]
As shown in FIGS. 2 and 4, a protrusion 21 is provided on a flat plate-like rising portion 12 that rises substantially vertically from below, and this protrusion 21 is formed on the side frame 1. Together with the guide hole 41, a guide structure that defines a trajectory when the holder 10 is moved up and down is formed. Since the shape of the lower half of the guide hole 41 is formed so as to be the same locus as the displacement locus of the carriage guide shaft 2, the protrusion 21 fitted in the guide hole 41 moves inside the guide hole 41 during the displacement operation. It is guided along the same locus as the carriage guide shaft 2. Therefore, the linear scale 4 attached to the holder 10 moves along the same path as the carriage guide shaft 2 and eventually the carriage, and the displacement in a state in which the relative position between the linear scale 4 and the carriage is ensured. enable.
[0039]
Further, the tip end side of the protruding portion 21 is formed in a T-shaped cross section, and functions as a retaining action portion 22 from the guide hole 41. The upper portion of the guide hole 41 is formed wider than the lower locus shape, and the guide hole 41 of the protrusion 21 is inserted by inserting the protrusion 21 from the upper portion of the guide hole 41 when the holder 10 is mounted. It is possible to easily fit into. Further, the protrusion 21 is connected to the side frame 1 by a backlash spring 52 for preventing backlash in the guide hole 41 and is guided in the guide hole 41 in a stable state.
[0040]
Based on the above, the operation of the recording apparatus in the present embodiment will be described.
The linear scale 4 is attached to a holder 10 (or a leaf spring 20 attached to the holder 10). The holder 10 is moved up and down in synchronization with the displacement of the carriage guide shaft 2 provided with the eccentric mechanism 30. As a result, the linear scale 4 is displaced up and down in conjunction with the carriage guide shaft 2. Accordingly, since the relative position of the linear scale 4 with respect to the carriage does not change, the accuracy of position detection in the main scanning direction of the carriage is not impaired.
[0041]
Since the holder 10 also has a grounding function for grounding the carriage guide shaft 2 and the side frame 1, the number of parts may be increased in order to achieve grounding of the carriage and / or the carriage guide shaft 2. Absent.
[0042]
In addition, since the disc spring 51, which is an urging member, is configured to press the holder 10 against the side frame 1, the holder 10 can be brought into firm contact with the side frame 1, and its grounding function can be achieved. It will be even more certain. Further, since the countersunk circle 51 stabilizes the holder 10 without rattling, the integrity of the carriage guide shaft 2 and the linear scale 4 becomes strong, and even if PG adjustment is performed, the linear scale 4 The position detection accuracy by can be maintained high.
[0043]
Next, as shown in FIGS. 5 and 6, the eccentric mechanism 30 used in the recording apparatus according to the present invention is a PG adjustment bush for PG adjustment by displacing the vertical position of the carriage guide shaft 2 (carriage). In addition to 31, a parallelism adjusting bush 32 for adjusting the parallelism of the carriage is provided. The side frame 1 is provided with a mounting hole 42 for the parallelism adjusting bush 32, and the parallelism adjusting bush 32 is rotatably fitted in the mounting hole 42. A PG adjustment bush 31 is inserted into the parallelism adjustment bush 32.
[0044]
The inner PG adjustment bush 31 supports a small-diameter shaft 3 having a substantially D-shaped cross section of the carriage guide shaft 2 and is in contact with the outer parallelism adjustment bush 32 in a rotatable state. . The carriage guide shaft 2 supported by the PG adjustment bush 31 is displaced up and down by a PG adjustment operation lever (not shown). That is, since the shaft support portion is provided at a position deviated from the center of the PG adjustment bush 31, the rotation center of the PG adjustment bush 31 and the small-diameter shaft 3 is different, and as a result, the outer parallelism adjustment bush 32 is fixed. When the operating lever is swung, the carriage guide shaft 2 pivotally supported by the PG adjustment bush 31 is displaced while rotating, and the carriage guide shaft 2 can be moved up and down. Further, the parallelism adjusting bush 32 is locked by a locking means 43 (here, a screw) at another part of the side frame 1 via a lever, and the operation lever of the PG adjusting bush 31 is fixed. The parallelism of the carriage can be adjusted by loosening the screw 43 which is the locking means of the locking portion 33 and rotating the parallelism adjusting bush 32.
[0045]
FIG. 5 shows the state in which the eccentric mechanism 30 is fitted in the mounting hole 42 of the side frame 1 in detail.
The eccentric mechanism 30 is provided with a total of four portions, three frame mounting portions 121 provided concentrically with the center of the parallelism adjusting bush 32, and a reduced diameter portion 124, respectively, on the main body side frame 1 of the recording apparatus. It is attached to the main body side frame 1 of the recording apparatus in contact with the four sides of the mounting hole 42 having a rectangular shape, fitted in a rotatable state. The three frame mounting portions 121 are adapted to act on the urging force so as to be pressed against the mounting hole 42 by the first urging means 122 as indicated by the symbol a. As a result, the first urging means 122 prevents rattling of the parallelism adjusting bush 32 and presses the first eccentric hole 123 of the PG adjusting bush 31 in the direction indicated by the symbol b.
[0046]
When the first eccentric hole 123 is pressed in the direction indicated by the symbol b, the reduced diameter portion 124, which is a thin plate-like wall structure, has the parallelism adjusting bush 32 including the reduced diameter portion 124 formed of plastic. Since it is formed of a soft material such as, it is crushed and deformed in the direction indicated by the symbol d, and is bent along the side indicated by the symbol f of the mounting hole 42. The diameter of the eccentric hole 123 is reduced. As a result, the PG adjustment bush 31 is pushed by the reduced diameter portion 124 and is pushed against the first eccentric hole 123, thereby preventing the PG adjustment bush 31 from rattling.
[0047]
Further, the second biasing means 132 provided in the second eccentric hole 131 causes the small-diameter shaft 3 to be fitted into the second eccentric hole 131 to be biased in the direction indicated by the symbol e. The eccentric hole 131 is pressed against the surface indicated by the symbol g. Thereby, rattling of the carriage guide shaft 2 is prevented.
[0048]
FIG. 6 is a front view of the eccentric mechanism 30. In the recording apparatus, eccentric mechanisms 30 are provided at both ends of the carriage guide shaft 2, respectively. The PG adjustment bush 31 of the eccentric mechanism 30 has a shape capable of transmitting a rotational force for rotating the PG adjustment bush 31 in order to change the gap between the recording material and the head surface of the recording head. . Therefore, the eccentric mechanism 30 changes the gap between the recording material and the head surface of the recording head as the PG adjustment bush 31 rotates as indicated by the phantom line in FIG.
[0049]
In this way, the small diameter shaft 3 is provided on the carriage guide shaft 2, and the eccentric mechanism 30 including the PG adjustment bush 31 to which the small diameter shaft 3 is fitted and the parallelism adjustment bush 32 to which the PG adjustment bush 31 is fitted is a carriage. An eccentric amount that does not depend on the thickness of the guide shaft 2 can be obtained. Further, the eccentric mechanism 30 has a structure in which the carriage guide shaft 2 moves up and down in the vertical direction in order to accurately and easily adjust the parallelism, while recording due to wear of the PG adjustment bush 31. This prevents the quality from being lowered and the recording quality from being lowered due to the backlash between the parallelism adjusting bush 32 and the PG adjusting bush 31.
[0050]
In another embodiment, the parallelism adjusting bush 32 is rotated in a recording apparatus in which the head surface of the recording head is a vertical surface and the recording material is conveyed in the vertical direction. Thus, the carriage guide shaft 2 can be configured to move in the horizontal direction.
Furthermore, as another embodiment, the small diameter shaft 3 of the carriage guide shaft 2 can be eccentric so that a larger amount of eccentricity can be obtained.
[0051]
As described above, in the present invention, as a result of the holder 10 of the linear scale 4 being tuneably mounted on the carriage guide shaft 2 employing the eccentric mechanism 30, the carriage guide shaft 2 and the linear scale 4 are interlocked. Therefore, the PG adjustment and the position of the linear scale 4 can be changed by only one switching operation. The eccentric mechanism 30 is not limited to the eccentric bush described above, and a known mechanism such as an eccentric shaft can be employed.
[0052]
【The invention's effect】
According to the present invention, since the linear scale is attached so as to be integrally displaceable in conjunction with the displacement of the carriage guide shaft via the holder, when the carriage is moved up and down for PG adjustment, the linear scale is Also move up and down together with the carriage. Therefore, since the relative position of the linear scale with respect to the carriage does not change, the accuracy of position detection in the main scanning direction of the carriage is not impaired.
Further, since the holder has a grounding function for grounding the carriage guide shaft and the side frame, the carriage and / or the carriage guide shaft can be grounded efficiently without increasing the number of parts.
[Brief description of the drawings]
FIG. 1 is a perspective view of a main part of a recording apparatus according to an embodiment of the invention.
FIG. 2 is a cross-sectional view of the main part of FIG.
FIG. 3 is a perspective view of main parts of a recording apparatus according to an embodiment of the invention.
FIG. 4 is a side view showing a state of the outside of the side frame of the recording apparatus according to the embodiment of the invention.
FIG. 5 is an explanatory view showing details of an eccentric mechanism.
FIG. 6 is a plan view of an eccentric mechanism.
7A and 7B are side views of the main part as viewed from the right in FIG. 2, in which FIG. 7A is a state before engaging the carriage guide shaft, and FIG. An eccentric mechanism and a side frame are not shown for easy understanding of the state before the state in which it cannot be pulled out.
[Explanation of symbols]
1 Side frame
2 Carriage guide shaft
3 Small diameter shaft
4 Linear scale
10 Holder
11 Spacing shape part
12 Rising part
13 Mounting part
14 Buttocks
15 Positioning part
16 Projection
20 leaf spring
21 Protrusion
22 Retaining action part
30 Eccentric mechanism
31 PG adjustment bush
32 Parallelism adjustment bush
33 Locking part
41 Guide hole
42 Hole for mounting
43 Locking means
51 Disc spring
52 Backlash prevention spring
60 Arrow indicating static electricity flow
70 engaging part
121 Frame mounting part
122 First biasing means
123 First eccentric hole
124 Reduced diameter section
131 Second eccentric hole
132 Second urging means

Claims (7)

A carriage having a recording head unit for recording on a recording material and capable of reciprocating in the main scanning direction;
A carriage guide shaft that supports the carriage and guides movement in the main scanning direction;
A side frame that is a structural member that pivotally supports the carriage guide shaft;
A linear scale which is a moving position detecting means in the main scanning direction of the carriage,
A recording apparatus having a mechanism for displacing the carriage guide shaft,
A holder is provided that engages with the carriage guide shaft and can be displaced integrally with the carriage guide shaft, and the linear scale is attached to the holder to interlock the linear scale with the displacement of the carriage guide shaft. And displaceable,
A biasing member is provided between the holder and the carriage guide shaft, and the biasing member is configured to press the holder against the side frame,
The holder is made of a conductive material, has a rising portion that abuts against a wall surface of the side frame, and has a grounding function for grounding the carriage guide shaft and the side frame. apparatus.   2. The recording apparatus according to claim 1, wherein a leaf spring is provided on at least one of the holders, and the linear scale is attached to the leaf spring.   3. The carriage guide according to claim 1, wherein the holding part is formed in a partially open substantially semicircular shape in which an engaging part with which the carriage guide shaft engages can be engaged from an outer edge side of the holding part. The shaft is formed in a cross-sectional shape that cannot be pulled out from the open side by being engaged with the substantially semicircular engaging portion and then turning a predetermined amount around the axial center line. apparatus.   4. The recording apparatus according to claim 1, wherein a positioning unit in a height direction of a linear scale is formed in the holder. 5.   5. The recording apparatus according to claim 1, further comprising a guide structure that guides the movement of the holder along a trajectory that coincides with a displacement trajectory of the carriage guide shaft.   6. The guide hole according to claim 5, wherein the guide structure includes a protrusion formed in the holder, a guide hole provided in the side frame in a shape that allows the protrusion to be fitted and coincides with a displacement locus of the carriage guide shaft. And a recording apparatus.   The recording apparatus according to claim 6, wherein the protruding portion is provided with a retaining action portion for preventing the projecting portion from coming off from the guide hole of the side frame.

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