JP2000071544A - Recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a recorder for forming a good image at low cost while suppressing the sliding noise or sliding load. SOLUTION: The recorder comprises a carriage section 5 turnable about a guide shaft, and a section for positioning the carriage section 5 in the rotational direction by urging it to the sliding face 821 of a guide rail 82 (adjusting means comprising an inter-paper adjusting level 581a and an eccentric cam) wherein the sliding face (cam face) 585c at the positioning section is tapered to recede from the sliding face 821 of the guide rail starting from the forward toward the root thereof. In order to prevent the carriage from being turned with an external force generated at the time of fixing it to a recording head, the abutting position of the sliding face (cam face) 585c and the sliding face 821 is located between the center of rotation of the eccentric cam and the point where the external force acts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a serial type recording apparatus in which a carriage holding recording means performs main scanning in a direction intersecting with a recording medium conveying direction (sub-scanning direction).

[0002]

2. Description of the Related Art A recording device having a function such as a printer, a copying machine, a facsimile, or a recording device used as an output device of a composite electronic device or a workstation including a computer or a word processor is based on image information. It is configured to record an image on a recording material (recording medium) such as a recording medium or a plastic thin plate. This recording apparatus can be classified into an ink jet type, a wire dot type, a thermal type, a laser beam type, and the like according to a recording method.

In a serial type recording apparatus employing a serial scanning system in which a main scan is performed in a direction intersecting a conveying direction (sub-scanning direction) of a recording material, a recording means mounted on a carriage which moves along the recording material. The image is printed (main scanning), a predetermined amount of paper is fed (pitch transport) after printing of one line is completed, and then the image of the next line is printed on the stopped recording material again. By repeating the operation of (main scanning), recording of the entire recording material is performed.

[0004] Among the above recording apparatuses, an ink jet recording apparatus (ink jet recording apparatus) performs recording by discharging ink from a recording means (recording head) onto a recording material. It is easy to record high-definition images at high speed, it can be recorded on plain paper without special processing, running cost is low, and because it is a non-impact method, there is little noise, In addition, there is an advantage that it is easy to record a color image using multicolor inks.

[0005] The carriage configuration in this ink jet recording apparatus will be described with reference to FIGS.

As shown in FIG. 11, a carriage section 5 is provided in the ink jet recording apparatus 1. A guide shaft 81 attached to the printer chassis 8 is passed through a bearing of the carriage 50, and a carriage section 5 is provided. 5
Has a configuration in which a reciprocating scan can be performed by sliding a guide rail portion 82 similarly attached to the printer chassis 8 with screws.

A timing belt 83 is attached to the back of the carriage 50. This timing belt 83 is connected to a pulley 801 attached to a shaft of a carriage motor 80 attached to the printer chassis 8.
Are suspended on an idle pulley 84 which stretches a timing belt 83 also attached to the printer chassis 8. Reference numeral 6 denotes a cleaning unit, 34 denotes a platen, and 85 denotes a flexible fixing plate.

Further, a paper interval adjusting unit 58 for adjusting the gap between the recording head 7 and the recording medium as shown in FIGS. 17 and 18 is provided above the carriage 50. Here, FIG. 17 shows a state where the recording head 7 is mounted, and FIG. 18 shows a state where the recording head 7 is not mounted.

In FIG. 17 and FIG. 18, a paper gap adjusting lever 581 is configured to be rotatable by inserting a pin into a hole provided in the carriage 50. The paper gap adjusting lever 581 has a polygonal sliding surface 585 having a different distance from the rotation center of the paper gap adjusting lever 581 according to the number of paper gap positions.

The pressing lever 582 is rotatable around a pin provided on the carriage 50,
The sliding surface 585 of the sheet gap adjusting lever is urged against the sliding surface of the guide rail portion 82 by its own weight when the recording head 7 is attached to the recording head 7.

The sliding surface 585 of the paper adjusting lever 581
Is changed, the carriage 50 rotates around the guide shaft 81, and the paper interval can be changed. Further, a lever tip of the sheet gap adjusting lever 581 has elasticity, and a U-shaped convex portion is provided on the front surface of the lever. U of this lever
By fitting the mold projection and the groove 586 provided in the carriage 50, the position of the sheet adjustment lever 581 can be fixed.

Further, when the pressure contact lever 582 urges the cap guide portion provided on the printer chassis 8, the pressure is also the contact pressure against the cap of the recovery system. Also, 51
Denotes a head holder, 53 denotes a hook lever, 509 denotes a rib, 512 denotes a pressing portion, 513 denotes a guide portion, 515 denotes a concave portion, and 583 denotes a spring.

As described above, the simple and low-cost configuration shown in FIGS. 16 to 18 makes it possible to easily adjust the sheet interval.

[0014]

However, this prior art configuration has the following problems to be further improved.

(1) When the sliding surface of the positioning portion of the carriage comes into contact with the sliding surface of the guide rail, a sliding noise is generated. In the related art, in order to reduce the sliding noise, a member having high surface accuracy or a material having high slidability is used for the guide rail, which causes a cost increase. Also,
If a relatively coarse material is used for the guide rails or the printer chassis and guide rails are integrated to reduce costs, the sliding noise of the carriage during scanning will increase, Since the resistance increases, the load at the time of scanning also increases, and improvement is desired also from the viewpoint of improving printing accuracy (image accuracy).

(2) When the sliding surface is switched by the paper gap adjusting lever to adjust the gap between the recording medium and the recording means, a sliding noise is generated when the sliding surface comes into contact at the edge. Sometimes.

(3) When an external force is applied to the carriage by an operation of attaching the recording head to the carriage or the like, a force acts in a direction to release the sheet gap adjusting lever from the fixed position, and the fixed position becomes unstable. In some cases, this is a point that should be improved in order to improve the accuracy.

SUMMARY OF THE INVENTION The present invention has been made to solve these problems of the prior art, and provides a recording apparatus capable of forming a good image at low cost with reduced sliding noise and sliding load. With the goal.

[0019]

According to the present invention, there is provided a carriage holding a recording means for forming an image on a recording medium and capable of scanning in the main scanning direction, a guide shaft and a guide rail for guiding the carriage to scan, Transport means for transporting the recording medium in the sub-scanning direction, wherein the carriage is rotatable about the guide shaft, and is positioned in the rotational direction by urging the carriage against the guide rail. In the recording apparatus having a positioning portion, the sliding surface shape of the positioning portion of the carriage is adjusted so that the leading end of the sliding surface of the positioning portion of the carriage abuts on the holding portion side of the sliding surface of the guide rail. It is a recording device characterized by comprising.

Further, the present invention provides a carriage which holds a recording means for forming an image on a recording medium and is capable of scanning in the main scanning direction, a guide shaft and a guide rail for guiding the carriage to scan, and Transport means for transporting in the scanning direction, the carriage being rotatable about the guide shaft, and having a positioning portion for positioning in the rotational direction by urging the carriage against the guide rail. In the recording apparatus, the positioning portion of the carriage has an eccentric cam for adjusting a gap between the recording medium and the recording means, and an adjusting means including an adjusting lever for rotating the eccentric cam. At least one sliding surface abuts on the sliding surface of the guide rail between the rotation center point of the eccentric cam and the point where an external force acts. A recording apparatus characterized by capable of taking a state.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, details of main parts of a carriage unit of a recording apparatus according to the present invention will be described with reference to FIGS.

As shown in FIGS. 9 to 11, the carriage 5
The carriage 50, the head holder 51, the base cover 52, the hook lever 5
3, a hook cover 55, a flexible substrate 56, other contact springs, rubber pads, and the like.

The head holder 51 mounts the recording head 7 along a guide 501 provided on the carriage 50 shown in FIG. 12, and is configured to slide left and right.

The head holder 51 is provided with a pressing portion 512 shown in FIG. This pressing part 512
Is for pressing the recording head 7 against the contact surface 503 and the positioning surface 504 of the side plate 502 erected perpendicular to the carriage 50 shown in FIGS.

There are three positioning surfaces 504 on the side plate 502 of the carriage 50. These are configured to correspond to two points on the base plate near the nozzles of the recording head 7 and one point above the ink tank of the recording head 7.
Contact surface 503 between recording head 7 and carriage 50
Are configured to be located inside a triangle formed by the three points of the positioning surface 504. The pressing position of the pressing portion 512 of the head holder 51 is inside this triangle.

As shown in FIG. 14 [(a) is a front view, (b) is a bottom view, and (c) and (d) are right and left side views] of the recording head 7, a guide 74 is provided on the side surface of the ink tank 73. The guide portion 513 shown in FIGS. 17 and 18 is provided.
Attached along the side of the. At a predetermined position where the recording head 7 is mounted, a concave portion 75 is provided in a guide 74 of the recording head 7. Further, a convex portion 76 is provided on the bottom surface of the recording head 7, and a concave portion 515 shown in FIG. 13 is provided in a receiving portion of the head holder 51 corresponding to the convex portion 76. With this configuration, when the recording head 7 is mounted, the nozzle 70
The recording head 7 is not damaged. In addition, a click feeling at the time of mounting is obtained, and the feeling of mounting is improved. In FIG. 14, reference numeral 78 denotes a contact surface, and 731 denotes a concave portion.

The hook lever 53 shown in FIGS.
Is rotatably attached to the side plate 502 of the carriage 50. A contact spring is provided at the center of rotation of the hook lever 53 and urges the hook lever 53.

The hook cover 55 is attached so as to cover the hook lever 53, and holds the hook lever 53 so that the hook lever 53 does not come off the carriage 50. The hook lever 53 and the head holder 51 have respective cams that come into contact with each other, and the head holder 51 is configured to move in the left-right direction by rotation of the hook lever 53. The urging force of the contact spring is applied to the recording head 7 by the head holder 51 via the hook lever 53.
Pressure.

As shown in FIGS. 12 and 13, on the side plate 502 of the carriage 50, fitting pins 505a and 505b for positioning the recording head 7 are provided.
These fitting pins 505a and 505b are fitted into fitting holes 77a and 77 of the base plate 72 of the recording head 7 shown in FIG.
Two are provided corresponding to b. 12 and 13, 57 is a rubber pad, 506 is a positioning pin, 507 is a slit hole, 521 is a holding portion, and 561
Is a contact portion.

As shown in FIG. 14, the base plate 72 of the recording head 7 is inclined from the driving of the recording head 7 by about 1 ° to 4 ° with respect to the scanning direction of the carriage unit 5.
To accommodate the inclined fitting holes 77a and 77b, one of the fitting holes 77 (77a in the figure) of the base plate 72 of the recording head 7 is formed into a square hole, and as shown in FIG. The fitting pin 505a on the carriage 50 side is a square pin having a partly cylindrical shape 505d, and the fitting hole 7
As shown in FIG. 15A, the fitting pin 505b on the carriage 50 side is
The portion that becomes an undercut in the mold configuration is removed so that the fitting at the position where the recording head 7 abuts on the positioning surface 504 of the carriage 50 can be achieved. With such a configuration, a complicated type structure is not required,
The recording head 7 can be accurately and smoothly positioned even with respect to the inclined base plate 72.

When mounting the recording head 7, the hook lever 53 is raised upward as shown in FIG. 10, and the head holder 51 is moved to the left so that the recording head 7 can be mounted. With the recording head 7 mounted in this state, the hook lever 5
When the head 3 is rotated downward as shown in FIG. 9, the head holder 51 moves to the right together with the recording head 7, and
Positioning, electrical contact and the like are performed. In this state, an image can be formed on the recording medium. Further, when the recording head 7 is detached from the carriage section 5, the hook lever 5
3 is raised upward as shown in FIG.
Is moved to the left, the guide portion 513 of the head holder 51 presses the recording head 7 to the left, so that the recording head 7 is removed from the carriage portion 5.

Next, the characteristic structure of the present invention will be described as first and second embodiments while comparing with the conventional technology.

<First Embodiment> First, a conventional technique will be specifically described with reference to FIGS.

FIGS. 5 and 7 are detailed top and side views when the sheet gap of the sheet adjusting lever 581 attached to the carriage is narrow. FIGS. 6 and 8 are also similar figures when the sheet gap is wide. It is an upper surface and a side detailed view.

As shown in FIG. 5 to FIG.
81 has a plurality of eccentric cam surfaces 585. The eccentric cam surface 585 is connected to the guide rail sliding surface 8 by using the adjustment lever 581 as a center of rotation about a shaft fitted to the carriage.
By rotating the carriage unit 5 to a position where the carriage unit 5 abuts on the guide shaft 81 shown in FIG. 11 and the like, the gap between the recording head 7 and the recording medium can be adjusted. However, in such a shape of the sliding surface of the sheet adjusting lever 581 (shape of the eccentric cam surface 585), the guide rail sliding surface 821 and the lever sliding member 821 are in a state where the sheet gap shown in FIGS. 5 and 7 is narrow. Moving surface 5
85a comes into contact with the surface, so that the vibration of the sheet adjustment lever 581 is transmitted to the carriage unit 5 in a large state. Moreover, the contact area with the guide rail sliding surface 821 is large,
The guide rail portion 82 also comes into contact at the tip end where the vibration increases, and as a result, the sliding noise increases.

As shown in FIGS. 6 and 8, when the gap between the sheets is changed to a wide state, the gap adjusting lever 581 is set.
When the sliding surface 585b and the sliding surface 585a contact each other at the edge, and the edge is affected by burrs and steps at the time of forming parts, the sliding noise increases.

Next, the first embodiment of the present invention can solve the problems of the prior art (FIGS. 5 to 8).
This will be described with reference to FIGS.

FIGS. 1 and 3 are detailed top and side views when the sheet gap of the sheet adjusting lever 581 mounted on the carriage is narrow. FIGS. 2 and 4 are also figures when the sheet gap is wide. It is a top view and a detailed side view.

As shown in FIGS. 3 and 4, the shapes of the sliding surfaces 585c and 585d of the sheet gap adjusting lever 581a are such that the leading end thereof is in contact with the holding portion of the sliding surface 821 of the guide rail. It is tapered away from the sliding surface 821 of the guide rail from the tip toward the root. That is, the sliding surfaces 585c, 585 of the sheet gap adjusting lever 581a
The shape of d has a tapered surface that comes into contact with the holding portion (root) side of the guide rail portion 82 first and moves away from the guide rail as the distance from the holding portion increases. Further, the tip of the sliding surfaces 585c and 585d and / or the intersection of the tapered face and the tip face are smoothly connected by an R shape (curved surface shape).

As described above, in the first embodiment of the present invention, the sliding surfaces 585c, 585 of the paper interval adjusting lever 581a are provided.
As shown in FIGS. 3 and 4, d is (1) a smooth, small contact area, and (2) abuts against the rail holding portion (root) side where the vibration is small at the time of contact with the guide rail;
(3) By making contact with the leading ends of the sliding surfaces 585c and 585d, which are advantageous for absorbing vibration due to the mold elasticity, the sliding noise during carriage scanning can be reduced and the sliding load can be reduced. Even when a convex shape such as a burr or an edge at the end of the guide rail portion 82 occurs, no problem occurs,
The printing accuracy can also be improved.

Furthermore, since the guide rail portion 82 is configured to contact at a position closer to the holding portion (root) side, the guide rail portion 82 is more securely contacted than at the tip (end) side of the guide rail portion 82. Abutment at the place fixed and supported by the As a result, it is possible to more effectively suppress the resonance of the sound, which is effective in reducing the sliding sound.

In FIG. 1 to FIG.
2 is integrated with the printer chassis 8, but the same effect can be obtained with a configuration in which the guide rail portion 82 is formed of a separate member and attached to the printer chassis 8 in order to reduce costs and reduce the number of parts. Is possible.

Further, as shown in FIGS. 1 to 4, when the guide rail portion 82 and the printer chassis 8 are integrally formed, in the bending of an integral member such as a steel member, the bending portion is closer to the holding portion than to the distal end. However, it is easy to obtain high accuracy. Therefore, the configuration in which the guide rail portion 82 comes into contact with a portion closer to the holding portion (root) side also improves the accuracy of gap adjustment in that respect.

FIGS. 2 and 4 are detailed top and side views when the cam surface 585 of the paper gap adjusting lever 581a is switched to widen the paper gap. Also in this case, it is possible to reduce the sliding noise at the time of scanning the carriage, as in the case of FIGS. Regardless of which gap is set, a stable sliding state can be maintained by setting the guide rail portion 82 and the sliding surfaces 585c, 585d of the lever 581a at substantially the same position.

<Second Embodiment> First, the prior art will be specifically described with reference to FIGS. 5 to 8, FIGS. 17 and 18. FIG.

FIG. 17 is a view showing a state in which the recording head 7 is not mounted on the carriage section 5, and FIG. 18 is a view showing a state in which the recording head 7 is mounted on the carriage section 5. The basic operation of the method of mounting the recording head 7 is based on mounting the recording head 7 by moving the hook lever 53 from the state of FIG. 17 to the state of FIG. 18 as described above. At this time, the carriage interval 5 is supported by the guide shaft 81 shown in FIG.
An external force is applied to the surface that comes into contact with the guide rail.

In FIG. 6, the sliding surface 585b of the sheet gap adjusting lever 581 that contacts the guide rail is located on the left side with respect to the rotation center line L of the sheet gap adjusting lever 581. In this state, as described above, when a force for pushing the hook lever 53 to attach the recording head 7 is applied, the rotation center of the sheet gap adjusting lever 581 is set as a fulcrum due to the relation of the force. The sliding surface 585b becomes a point of force, and a force acts in the direction of arrow D3.

At this time, the carriage portion 5 which is a plastic molded product is simultaneously bent by the operation force of the hook lever 53. Further, since the fixed fitting portion 586 (the fixed fitting portion on the hidden side in FIG. 6) of the paper gap adjusting lever 581 is disengaged by bending, the paper gap adjusting lever 581 is rotated in the direction of arrow D4 as a result. Could be done. Also, in the state of FIG. 5, there is a possibility that the sheet gap adjusting lever 581 may move in the direction of D2 by the same operation.

Next, the second embodiment of the present invention can solve the problems of the prior art (FIGS. 5 to 8).
This will be described with reference to FIGS.

In FIGS. 1 and 2, a stopper 585e is provided on the sheet gap adjusting lever 581a, and a rotation preventing rib 588 is provided on the carriage.

In the state where the gap is wide as shown in FIG. 2, the sliding surface (cam surface) 585d moves between the rotation center point of the eccentric cam and the point where an external force acts on the sliding surface 821 of the guide rail. Is in contact with the Specifically, when a force is applied from the outside, the paper gap adjusting lever 581
Since the sliding surface (cam surface) 585d of the paper interval adjusting lever 581a always contacts the sliding surface 821 of the guide rail on the side on which an external force acts with respect to the rotation center line L of a, the paper interval adjusting lever 581a Produces an action force that rotates in the direction of arrow D8. At this time, the stopper 585e provided on the sheet gap adjusting lever 581a is in contact with the surface 588a of the rib 588 of the carriage, and is configured to prevent the sheet gap adjusting lever 581a from rotating without permission.

Even when the gap shown in FIG. 1 is narrow, the sliding surface (cam surface) 585c is in contact with the sliding surface 821 of the guide rail between the center of rotation of the eccentric cam and the point where an external force acts. It is in a state of contact. Here, when a similar acting force acts, a force is generated that rotates the sheet gap adjusting lever 581a in the direction of arrow D6. In this case, the surface 588b of the rib collides with the surface 585f of the sheet adjustment lever, thereby preventing the sheet adjustment lever 581a from rotating beyond the position where it should be fixed.

With the structure shown in FIGS. 1 and 2, even when an external force is applied to the carriage 50,
The position of the sheet gap adjusting lever 581a can be reliably fixed, and deterioration of an image can be prevented by maintaining a stable gap adjustment state.

Further, in the example shown in FIGS. 1 and 2, in order to fix the position of the sheet gap adjusting lever 581a, the sheet gap adjusting lever 5 is used.
A U-shaped convex portion 587 is provided on the front rising portion of 81a, and two V-shaped concave portions 586a fitted to the U-shaped convex portion 587 are provided on the upper surface of the carriage 50 on the carriage 50 side. This V-shaped recess 586
a is a U-shaped convex portion 58 of the sheet gap adjusting lever 581a.
By making line contact with the R surface of No. 7, play of fixing the adjustment lever is eliminated, and optimal positioning can be performed.

[0055]

As described above, according to the present invention,
The following effects can be obtained.

(1) More specifically, by providing a configuration in which the tip of the sliding surface of the positioning portion of the carriage and the holding portion of the sliding surface of the guide rail are in contact with each other, more specifically, the recording medium and the recording medium are recorded. An adjusting means comprising an eccentric cam for adjusting the gap with the means and an adjusting lever for rotating the eccentric cam is adopted, and the guide rail slides from the tip of the sliding surface (cam surface) of the eccentric cam toward the root. By adopting a tapered configuration away from the moving surface, sliding noise can be reduced at low cost, the load during scanning can be reduced, and printing accuracy can be improved. Furthermore, the tip of the sliding surface of the positioning portion, and / or
By making the intersection of the tapered surface and the tip surface into an R-shape, smoother, less load, and better scanning can be performed. Further, if the above configuration is used, the guide rail can be formed integrally with the printer chassis, so that the number of parts can be reduced and the cost can be further reduced.

(2) When the gap is adjusted to be wide, the shape of the sliding surface (cam surface) is also changed to an R-shaped intersection point between the tip (upper horizontal plane) of the positioning portion such as an adjustment lever and the tapered surface. In addition, the smooth connection can eliminate the contact at the edge portion, and similarly can reduce the sliding noise and the sliding load when scanning the carriage.

(3) At least one sliding surface of the eccentric cam can be brought into contact with the sliding surface of the guide rail between the rotation center point of the eccentric cam and the point where an external force acts. This makes it possible to optimize the positions of the fulcrum and the point of force even when an external force is applied to the carriage due to a recording head replacement operation, etc., and it is possible to securely fix the position of the adjustment lever, which causes image deterioration. And a stable gap adjustment state can be maintained.

[Brief description of the drawings]

FIG. 1 is a top view of a carriage adjustment lever section illustrating a recording apparatus of the invention.

FIG. 2 is a top view of a carriage adjustment lever portion illustrating the recording apparatus of the present invention.

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a side view of FIG. 2;

FIG. 5 is a top view of a carriage adjustment lever portion in a conventional example.

FIG. 6 is a top view of a carriage adjustment lever portion in a conventional example.

FIG. 7 is a side view of FIG. 5;

FIG. 8 is a side view of FIG. 6;

FIG. 9 is a front view illustrating the recording apparatus of the invention, with the recording head removed from the carriage.

FIG. 10 is a front view illustrating a recording apparatus according to an embodiment of the invention, with a recording head attached to a carriage.

FIG. 11 is a side view of a carriage illustrating the recording apparatus of the invention.

FIG. 12 is a side view of a carriage illustrating the recording apparatus of the invention.

FIG. 13 is a side view of a carriage illustrating the recording apparatus of the invention.

FIG. 14 is an external view of a recording head illustrating the recording apparatus of the invention.

FIG. 15 is a detailed view of a carriage fitting pin.

FIG. 16 is an overall configuration diagram of an inkjet recording apparatus.

FIG. 17 is a top view showing a state in which a recording head is attached to a carriage in a conventional example.

FIG. 18 is a top view of the conventional example with a recording head removed from a carriage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recording device 5 Carriage part 7 Recording head 8 Printer chassis 50 Carriage 51 Head holder 52 Base cover 53 Hook lever 55 Hook cover 56 Flexible board 81 Guide shaft 82 Guide rail 83 Timing belt 84 Idle pulley 581, 581a Adjustment lever 582 Pressure contact lever 585a To d Sliding surface (cam surface) 585e Stopper 588 Rotation preventing rib 586a V-shaped concave portion 587 U-shaped convex portion 821 Guide rail sliding surface

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shinya Sonoda 3-30-2 Shimomaruko, Ota-ku, Tokyo F-term in Canon Inc. (reference) 2C480 CA48 DB02 DB03 DB08

Claims (9)

[Claims] A carriage that holds a recording unit that forms an image on a recording medium and is capable of scanning in a main scanning direction; a guide shaft and a guide rail that guide scanning of the carriage;
Transport means for transporting the recording medium in the sub-scanning direction, wherein the carriage is rotatable about the guide shaft, and the rotational direction is positioned by urging the carriage against the guide rail. In the recording apparatus having a positioning portion for performing the positioning, the shape of the sliding surface of the positioning portion of the carriage is such that the tip of the sliding surface of the positioning portion of the carriage and the holding portion side of the sliding surface of the guide rail abut. A recording device characterized by comprising: 2. The recording apparatus according to claim 1, wherein the shape of the sliding surface of the positioning portion of the carriage is tapered away from the sliding surface of the guide rail toward the root from the tip of the sliding surface. 3. The recording apparatus according to claim 2, wherein the sliding surface of the positioning portion of the carriage has a rounded shape at the tip of the sliding surface and / or at the intersection of the tapered surface and the leading surface. 4. The recording apparatus according to claim 1, wherein the positioning portion of the carriage includes an eccentric cam for adjusting a gap between the recording medium and the recording means, and an adjusting means including an adjusting lever for rotating the eccentric cam. . 5. The recording apparatus according to claim 1, wherein the guide rail is formed integrally with the printer chassis. 6. A carriage holding a recording unit for forming an image on a recording medium and capable of scanning in a main scanning direction, a guide shaft and a guide rail for guiding scanning of the carriage,
Transport means for transporting the recording medium in the sub-scanning direction, wherein the carriage is rotatable about the guide shaft, and the rotational direction is positioned by urging the carriage against the guide rail. In the recording apparatus having a positioning unit for performing the positioning, the positioning unit of the carriage includes an eccentric cam for adjusting a gap between the recording medium and the recording unit, and an adjustment unit including an adjustment lever for rotating the eccentric cam. At least one sliding surface of the eccentric cam may be in a state of contact with the sliding surface of the guide rail between a rotation center point of the eccentric cam and a point where an external force acts. Recording device. 7. The recording apparatus according to claim 6, wherein the point at which the external force acts is a point at which the external force generated for the operation of attaching the recording means to the carriage acts. 8. When there is no positioning portion of the carriage between the rotation center point of the eccentric cam and the point where an external force acts, the stopper has a stopper which is a rotation preventing member in a direction in which the adjusting means rotates by the external force. The recording device according to claim 6. 9. The recording apparatus according to claim 6, wherein the position of the adjustment lever is fixed by fitting a U-shaped projection provided on the adjustment lever with a V-shaped recess provided on the carriage.