JP2001146056A - Driving force transmission of scanning member in imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving force transmission of the scan motion member in an imaging apparatus in which stabilized traveling of the scan motion member can be realized. SOLUTION: A head carriage 15 is provided with parts 32a, 32b abutting slidably against a guide rail 18 at at least two positions in a plane orthogonal to the main scanning direction. A wire 29 for driving the head carriage 15 in the main scanning direction constitutes means for urging the abutting parts 32a, 32b toward the guide rail 18 side by dragging the head carriage 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a plotter or a printer using a scanning moving member such as a carriage which carries an ink cartridge and travels.
The present invention relates to a scanning-moving-member driving force transmission device of an image forming apparatus that enables stable movement of a scanning-moving member.

[0002]

2. Description of the Related Art Recording devices such as printers, copiers and facsimile machines, computers, word processors,
Recording devices used as output devices such as workstations include recording paper and plastic thin plates (for example, OHP).
It is configured to record an image including characters and symbols on a recording medium such as a sheet according to image information. However, depending on the recording method of the recording means to be used, an ink jet type, a wire dot type, a thermal type, and a thermal transfer type. Type and laser beam type.

In a serial type recording apparatus employing a recording method in which a main scanning is performed in a direction intersecting a sub-scanning direction which is a conveying direction of a recording medium, the recording medium is set on a predetermined recording position and then mounted on a carriage. The image is recorded for each row by the main scanning being performed by the recording head being reciprocated close to the recording medium. That is, 1
When the printing of the image for the row is completed, a predetermined amount of paper feeding (sub-scanning) is performed, and the printing of the image for the next row (main scanning) is performed. By repeating such an operation, an image is recorded in a desired range of the recording medium.

In a carriage for moving a recording head in the above-mentioned serial type recording apparatus, for example, as shown in FIG. 9, a long guide member 68 provided to extend in the main scanning direction is provided. Slide bearing 8 on carriage side
2 is slidably mounted, and is reciprocated by driving means (not shown) such as a belt connected to the carriage. At this time, the sliding bearing 8
Numeral 2 is a rod-shaped member having a round cross section, and has an inner diameter d1 of the sliding bearing 82 slightly larger than an outer diameter d2 of the guide member 68, so that the sliding bearing 82 is movable and fit. Such a bearing structure has the advantages of exhibiting appropriate dynamic stability and having a long life.

[0005]

However, in the above-described conventional slide bearing, the contact state between the slide bearing 82 on the carriage side and the guide member 68 is one line contact extending in the main scanning direction. Therefore, the contact position may move in the circumferential direction according to the direction of the acting force exerted on the carriage by the driving means (not shown) such as the belt.
That is, in the driving means, the direction in which the force acts on the carriage may change, for example, the angle of the carriage in the pulling direction changes between the forward movement and the backward movement. As a result, rotational movement occurs in the carriage,
There is a possibility that a gap between the recording head mounted on the carriage and the recording medium and a positional deviation in the sub-scanning direction may occur, thereby deteriorating the quality of the recorded image. Such a phenomenon is particularly likely to occur at both ends in the main scanning direction during acceleration and deceleration of the carriage.

On the other hand, in order to reduce the backlash between the guide member 68 and the slide bearing 82 on the carriage side in order to reduce the above-mentioned problem, a high-precision bearing component is required, or the vicinity of the bearing is required. It becomes necessary to provide a mechanism for removing backlash and the like, resulting in a complicated configuration and high cost.

Accordingly, the present invention provides a scanning moving member of an image forming apparatus capable of preventing a backlash in a direction perpendicular to the main scanning direction with a simple structure and realizing a stable running of a carriage as a scanning moving member. It is an object to provide a driving force transmission device.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a scanning movable member having a recording head for forming an image on a recording medium, and the scanning movable member are provided. Scanning member driving force transmission of an image forming apparatus, comprising: a guide member extending in the main scanning direction so as to guide in the main scanning direction; and driving means for reciprocating the scanning member along the guide member. In the apparatus, on one side of the scanning moving member or the guide member, there is provided an abutting portion slidably contacting the member on the other side at at least two different positions in a plane orthogonal to the main scanning direction. In addition, the driving means constitutes an urging means for pressing the scanning moving member toward the guide member by the driving force of the driving means.

Further, in the invention according to the second aspect, the contact portion of the scanning moving member according to the first aspect is formed on a bearing structure fixed to the scanning moving member, and the bearing structure includes the main scanning member. It is provided at least two places apart in the direction.

According to the third aspect of the present invention, the contact portion of the guide member of the first aspect extends in the main scanning direction.

Further, in the invention described in claim 4, one of the two different contact portions according to the first, second, and third aspects is arranged such that one of the two contact portions is in a discharge direction of the recording agent discharged from the recording head. They are provided on orthogonal planes.

Further, according to the invention described in claim 5, the other side of the two different contact portions according to claim 4 is a plane orthogonal to the plane provided with the one contact portion. It is provided in.

According to the present invention, the direction in which the biasing means of the first, second, third, fourth or fifth aspect presses the scanning moving member toward the guide member is different in the two different directions. It is provided in parallel with the two combined directions from the contact portion to the central axis of the guide member in the main scanning direction.

Further, in the invention according to claim 7, the driving means according to claim 1, 2, 3, 4, 5 or 6 includes an elongated member for pulling the scanning moving member in the main scanning direction. The two ends of the elongated member are fixed to two positions separated from each other in the main scanning direction of the scanning moving member, and are fixed to positions far from each other in the pulling direction.

Further, according to the invention described in claim 8, the elongated member of claim 7 is constituted by a wire or a belt.

According to the first aspect of the present invention having such a configuration, the contact portions provided at at least two different positions in a plane orthogonal to the main scanning direction are pressed against the guide member by the driving means. Therefore, even when the direction of action of the driving means on the scanning moving member changes, the scanning moving member is stably held, and the position of the scanning moving member can be maintained even during acceleration and deceleration when the scanning moving member travels. However, the print quality is always kept constant in a direction orthogonal to the main scanning direction, so that stable print quality can be maintained.

Further, according to the second aspect of the present invention,
The position of the scanning moving member in the direction orthogonal to the main scanning direction as described above can be maintained more stably.

According to the third aspect of the present invention, the above-described operation can be obtained in the same manner as described above.

Further, according to the fourth aspect of the present invention,
More stable printing quality can be maintained.

Further, according to the invention described in claim 5,
The above operation can be obtained efficiently.

According to the sixth aspect of the present invention, efficient biasing is performed on the scanning moving member.

According to the seventh aspect of the present invention, the scanning moving member is more efficiently biased.

Further, according to the invention described in claim 8,
The above-described biasing of the scanning moving member is reliably realized.

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a scanning-moving member driving force transmitting device for an image forming apparatus according to the present invention. FIG. 1 is a color plotter (hereinafter referred to as a plotter) which is an example of an ink jet type image forming apparatus equipped with a scanning moving member driving force transmission device according to the present invention.
It is a perspective view which shows schematic structure of.

The plotter 1 is fixed to an upper portion of a stand 2 having casters 2a.
An operation section 3 for operating the plotter 1 is provided at a front portion on one side in the longitudinal direction. The operation unit 3 is provided with various switches and the like. The switches and the like are set so that the size of the recording paper and the start and stop of the transportation of the recording paper can be instructed. Further, the recording paper is inserted from the recording paper insertion slot 4, and is conveyed into the plotter 1 based on an instruction from the operation unit 3, and then a color image is printed and discharged. .

FIG. 2 is a diagram showing a conveyance path from the insertion of the recording paper to the discharge thereof. The conveyance path of the recording paper will be described below with reference to FIG. First, in the above plotter 1,
Printing can be performed on a cut sheet-shaped recording paper inserted from the recording paper insertion slot 4 and on a recording paper (roll paper) 5 wound in a roll shape. The recording paper rolled or unwound from the roll body has a paper transport roller 9a attached to the lower transport support plate 8 and a paper transport roller 9b attached to the upper transport roller support plate 10,
Large-diameter drive roller 11 facing each of rollers 9a and 9b
And reaches above the printing plate 12. The recording paper on the printing plate 12 is sandwiched between the discharge roller 19 and the spur 20, and discharged toward the operator.

On the other hand, the printing section includes a head carriage (scanning member) 15 which reciprocates in the direction of arrow B.
A plurality of print heads (recording heads) 17 containing various color inks (for example, cyan, magenta, yellow, and black inks) are mounted on a head holder 16 of the head carriage 15. A plurality of ink ejection ports (not shown) for ejecting ink are formed on the ink ejection surface of the print head 17.

The head carriage 15 is mounted on the plotter 1
Is movably mounted on the guide rail 18 extending in the main scanning direction, which is the width direction of the camera, and is fixed to a wire 29 hung on a drive source (not shown).
The wire 29 is moved in the direction of the arrow B by the forward / reverse rotation of the drive source.
When the wire 29 reciprocates in the direction of arrow B, the head carriage 15 is guided by the guide rail 18 and reciprocates in the direction of arrow B.

On the other hand, the recording paper is intermittently conveyed in a direction perpendicular to the arrow B direction (recording paper conveyance direction). When forming an image on the recording paper, after temporarily stopping the recording paper, the head carriage 15 is reciprocated in the arrow B direction,
At the same time, an image is formed by discharging ink while detecting the position with a linear sensor. An image for the next row is formed on a new surface of the recording paper located in an image forming area formed in front of the ink ejection surface. By repeating this operation over the entire length of the recording paper, a color image is formed on the recording paper.

As shown in FIGS. 3A and 3B,
A substantially rectangular parallelepiped bearing structure 31 for supporting the head carriage 15 reciprocally with respect to the guide rail 18 is provided on the lower surface side of the head carriage 15. In order to stabilize the traveling of the head carriage 15, the bearing structure 31 in the present embodiment is
8 in the main scanning direction. Each of these bearing structures 31 has a U-shaped opening that is open to the lower side, and is mounted so that the opening covers the guide rail 18 having a circular cross-sectional shape from above. Have been.
A sliding bearing 32 is provided on the inner wall of the opening of the bearing structure 31 so as to slidably contact the guide rail 18.

The slide bearing 32 has an L-shaped cross section in a direction perpendicular to the main scanning direction, and has two L-shaped opposed surfaces to the guide rail 18. Contact portions 32a and 32b that are in contact with each other are provided. Abutment portion 32 on one of them
“a” is a horizontal plane orthogonal to the ink ejection direction, and is arranged so as to contact the guide rail 18 from above. Also, the contact portion 32b on the other side is
The guide rail 18 is arranged so as to contact the guide rail 18 from the recording paper carry-in side opposite to the side on which the driving means described later is provided. These contact portions 32a and 32b are provided over the entire length of the sliding bearing 32 in the main scanning direction.

The cross-sectional shape of the slide bearing 32 perpendicular to the main scanning direction is not limited to the L-shape shown in FIG. 3B, and for example, as shown in FIG. It may be a substantially U-shaped one. At this time, the contact portion 42a on one side is a horizontal plane orthogonal to the ink ejection direction, and the contact portion 42b on the other side is
This is a vertical plane orthogonal to 2a. The contact portions 42a and 42b are located on the upper side of the guide rail 18 and on the recording paper carry-in side.

Further, the cross-sectional shape of the guide rail 18 perpendicular to the main scanning direction is not limited to a circular shape. For example, as shown in FIG. The guide rail 48 may be provided.
Further, at this time, the cross-sectional shape of the slide bearing 52 orthogonal to the main scanning direction can be, for example, an L-shape.
The contact portion 52a on one side of the L-shaped sliding bearing 52 has a semicircular cross-sectional shape protruding from a plane 52c perpendicular to the ink discharge direction, and the contact portion 52b on the other side is ,
It has a semicircular cross-sectional shape protruding from a plane 52d perpendicular to the one surface 52c. In addition, each contact portion 52
Reference numerals a and 52b are located above the guide rail 48 and on the recording paper carry-in side.

Furthermore, as shown in FIG. 6, rollers 62a and 62b may be used as a contact portion on the bearing side with respect to the guide rail 48 having a U-shaped cross section opened downward.

Further, as shown in FIG. 7, contact portions 58a and 58b may be provided on the guide rail 58 side having a U-shaped cross section opened downward. At this time, the contact portion 58a on one side of the guide rail 58 has a semicircular cross-sectional shape projecting from a plane 58c orthogonal to the ink ejection direction, and the contact portion 58b on the other side has It has a semicircular cross-sectional shape protruding from a plane 58d orthogonal to the one surface 58c. In addition, each contact portion 58a, 58b
Are located above the guide rail 58 and on the recording paper carry-in side. In the above description, two contact portions (3
2a, 32b, etc.) are orthogonal, but need not necessarily be orthogonal, and the positional relationship may be an acute angle or an obtuse angle.

Next, returning to FIG. 3, the driving means will be described. An end portion of a wire 29 that forms a part of a driving unit that drives the head carriage 15 in the main scanning direction is connected to a side surface of the bearing structure 31 on the recording paper discharge side. The driving means includes the wire 29, the pulleys 27 and 28 wound by the wire 29, and the pulleys 27 and 2
And a drive device (not shown) for rotating the motor 8. Pulleys 27 and 28 connected to the driving device are arranged at both ends of the scanning range.

An intermediate portion of the wire 29 is wound around a part of the outer periphery of the pulleys 27 and 28. Both ends 29a and 29b of the wire 29 extending from the pulleys 27 and 28 The above-described bearing structures 31, 3
1 are connected from opposite sides. Thus, a loop is formed from one bearing structure 31 to the other bearing structure 31 via both pulleys 27 and 28.

At this time, the upper loop lines 29a, 29b extending between the respective pulleys 27, 28 and the respective bearing structures 31, 31 extend substantially horizontally between the pulleys 27, 28. And extends obliquely downward with respect to the lower loop line 29c. That is, the upper loop lines 29a, 29b extending from the pulleys 27, 28 toward the head carriage 15.
Extends diagonally downward, which is a direction in which the two contact portions 32a, 32b of the slide bearing 32 are pressed against the guide rail 18 side.
5 is the lower side (the lower side of FIG. 3B) and the inner side (FIG. 3B).
(The left side of (B)), and is positioned well.

At this time, the two pulleys 27 and 28 are moved away from the bearing structure 31 in the recording paper conveying direction, and the rotating shafts 27a and 28a of the two pulleys 27 and 28 are moved.
The recording paper carry-in side 28a is disposed so as to be inclined lower than the horizontal position, and is arranged so as to be pulled in the recording paper transport direction while pulling down each bearing structure 31, 31 via the wire 29. ing. That is, each of the bearing structures 31, 31 is configured to be pulled obliquely downward (in the direction C) by the wire 29 on the recording paper discharge side. Preferably, the C direction is a C1 direction from the contact portion 32a of the slide bearing 32 to the center axis of the guide rail 18 and a C2 direction from the contact portion 32b of the slide bearing 32 to the center axis of the guide rail 18. Good synthesis direction. Thus, when the wire 29 pulls the respective bearing structures 31, 31, the respective bearing structures 31, 31 are brought into contact with the contact portions 32a, 3 provided above the sliding bearing 32 and on the recording paper carry-in side.
In 2a, it will contact | abut the guide rail 18 reliably.

As described above, according to this embodiment, the contact portions 32a, 32b of the carriage 15 provided at least at two different positions in a plane orthogonal to the main scanning direction.
However, the carriage 15 is stably pressed against the guide rail 18 by the action force of the drive means, so that even if the action direction of the drive means with respect to the carriage 15 slightly changes, the carriage 15 is satisfactorily held without any displacement. It will be.
In particular, even during acceleration and deceleration when the carriage 15 travels, the position of the carriage 15 is always kept constant in a direction orthogonal to the main scanning direction, so that stable print quality can be maintained. .

Furthermore, the contact portions 32a and 32b of the head carriage 15 are formed on a bearing structure 31 fixed to the head carriage 15, and the bearing structure 3
Numerals 1 are provided at least at two places in the main scanning direction with a space therebetween. Therefore, the position of the head carriage 15 in the direction orthogonal to the main scanning direction as described above can be more stably maintained.

When the contact portions 32a and 32b are provided on the guide rail 18 serving as a guide member, the contact portions 32a and 32b extend in the main scanning direction. This also enables the above-described operation to be obtained similarly.

The contact portions 32 provided at the two different places described above
Since one of the sides a and 32b is provided on a plane orthogonal to the ejection direction of the ink as the recording agent, more stable printing quality can be maintained.

The two different contact portions 32a,
Since the other side of 32b is provided on a plane orthogonal to the plane on which the one side contact portion is provided, the above-described operation can be efficiently obtained.

The direction in which the head carriage 15 is pressed against the guide rail 18 by the wire 29 acting as the urging means is different from the two contact portions 32 described above.
It is preferable that the direction is parallel to the two combined directions from a and 32b toward the center axis of the guide rail 18 in the main scanning direction, so that efficient biasing is performed on the scanning moving member. .

As described above, since the bearing structure 31 receives the force obliquely downward (in the direction C) on the recording paper carry-out side, an upward moment acts on the recording paper carry-in side of the head carriage 15. Therefore, a pressing roller 36 is provided on the side surface of the head carriage 15 on the recording paper carry-in side.
The roller 36 pushes up a sub rail 40 provided right beside the recording paper carry-in side to prevent the head carriage 15 from floating.

More specifically, the sub rail 40 has a U-shaped cross section that opens in the recording paper transport direction. The lower end portion 15a of the side surface of the head carriage 15 on the side where the recording paper is carried in is mounted on the sub rail 40. Further, on the side of the recording paper loading side of the head carriage 15,
A leaf spring 35 is protruded toward the recording paper carry-in side. A pressing roller 36 is attached to the tip of the leaf spring 35, and the roller 36 is arranged to be inserted into the opening of the U-shaped sub rail 40.

The cylindrical surface of the roller 36 pushes the sub rail 40 upward from within the opening of the sub rail 40. Further, as described above, the lower end 15a of the side surface of the head carriage 15 on the recording paper carry-in side is placed above the sub-rail 40.
The sub rail 40 is sandwiched between the roller 36 and the roller 36. Thus, the lifting of the head carriage 15 is prevented.

When the head carriage 15 having a large moment of inertia is used, for example, as shown in FIG. 8A, when the head carriage 15 starts moving in the direction D from a stationary state, the moment of inertia is reduced. In operation, the head carriage 15 tries to rotate in the E direction. At this time, the bearing structure 31b tries to strike the guide rail 18, while a force in the direction away from the guide rail 18 acts on the bearing structure 31a. Therefore, as shown in FIG. 8C, the bearing structure 3
It is preferable that the force F1 for pressing the guide rail 18 by 1a be as large as possible.

This is because the upper wire line 29a of the loop constituted by the wire 29
And 29b are arranged so as to intersect with each other. That is, the end of the wire 29 extending from the pulley 27 is attached to the bearing structure 31b,
The end of the wire 29 extending from the pulley 28 is attached to the bearing structure 31a. At this time, the upper wire lines 29a and 29b are arranged so as to be positioned on the recording paper unloading side of the wire line 29c. Thereby, the bearing structure 31
a presses the guide rail 18 against the force F1.
1b can be greater than the force F2 of pressing the guide rail 18.

As described above, the driving means is provided with the wires 29 for pulling the head carriage 15 in the main scanning direction, and both ends of the wires 29 are separated from each other by two wires separated in the main scanning direction of the head carriage 15. Bearing structure 31
a, 31b, and are fixed to the bearing structures 31a, 31b farther from each other in the pulling direction, so that the head carriage 15 as a scanning moving member can be biased more efficiently. Is being done.

Further, since the long member of the driving means shown in FIG. 3 or FIG. 8 is constituted by a wire or a belt, the above-mentioned urging of the scanning moving member is reliably realized.

Although the embodiments of the present invention have been specifically described above, it is needless to say that the present invention is not limited to the above-described embodiments and can be variously modified without departing from the gist thereof. .

[0054]

As described above, according to the first aspect of the present invention, one side of the scanning moving member or the guide member has at least two different portions in a plane orthogonal to the main scanning direction.
A contact portion slidably in contact with the member on the other side at a location, and the driving means is configured as urging means for pressing the scanning moving member against the guide member by the driving force of the driving means. Since at least two different contact portions provided in a plane orthogonal to the main scanning direction are pressed against the guide member by the driving unit, even if the action direction of the driving unit on the scanning moving member changes, While holding the scanning moving member stably, even during acceleration and deceleration when running the scanning moving member,
The position of the scanning moving member is always kept constant in the direction orthogonal to the main scanning direction so that stable printing quality can be maintained, eliminating the need for high precision quality of the scanning moving member. Therefore, the positional accuracy of the scanning moving member can be improved at low cost.

According to a second aspect of the present invention, the contact portion of the scanning moving member according to the first aspect is formed on a bearing structure fixed to the scanning moving member, and the bearing structure is provided at least in the main scanning direction. Since it is provided at two places apart, the position of the scanning moving member in the direction perpendicular to the main scanning direction can be more stably maintained.

Further, even when the contact portion of the guide member of the first aspect is configured to extend in the main scanning direction as in the invention of the third aspect, the same effect as above can be obtained. Can be obtained.

According to a fourth aspect of the present invention, one of the two different contact portions according to the first, second, or third aspect is provided on a plane orthogonal to the discharge direction of the recording agent. Therefore, more stable printing quality can be maintained.

Further, according to a fifth aspect of the present invention, the other one of the two different contact portions in the fourth aspect is a plane perpendicular to the plane on which the one contact portion is provided. , The above-described operation can be efficiently obtained.

According to a sixth aspect of the present invention, the direction in which the scanning moving member is pressed against the guide member by the urging means of the first, second, third, fourth, or fifth direction is set to the two different positions. Since it is provided in parallel with the two combined directions from the contact portion to the central axis in the main scanning direction of the guide member, efficient biasing is performed on the scanning moving member.

According to a seventh aspect of the present invention, the driving means of the first or second or third or fourth or fifth or sixth aspect comprises an elongated member for pulling the scanning moving member in the main scanning direction. Since the two end portions of the elongated member are fixed to two places separated in the main scanning direction of the scanning moving member, and fixed to places far from each other in the pulling direction, the scanning movement is performed. More efficient biasing is performed on the member.

Further, in the invention according to the eighth aspect, since the elongated member according to the seventh aspect is constituted by a wire or a belt, the urging of the scanning moving member is reliably realized. .

[0062]

[Brief description of the drawings]

FIG. 1 is an external view illustrating an example of an inkjet image forming apparatus equipped with a scanning moving member driving force transmission device according to the present invention.

FIG. 2 is an external perspective perspective view illustrating a transport path from insertion to ejection of a recording sheet of the inkjet type image forming apparatus illustrated in FIG. 1;

FIG. 3 shows one embodiment of a scanning-moving-member driving force transmission device of an image forming apparatus according to the present invention, and (A).
Is an explanatory plan view, and FIG.

FIG. 4 is a diagram illustrating another embodiment of the scanning moving member driving force transmission device of the image forming apparatus according to the present invention.

FIG. 5 is a view showing another embodiment of the scanning moving member driving force transmission device of the image forming apparatus according to the present invention.

FIG. 6 is a diagram showing another embodiment of the scanning moving member driving force transmission device of the image forming apparatus according to the present invention.

FIG. 7 is a view showing another embodiment of the scanning moving member driving force transmission device of the image forming apparatus according to the present invention.

FIG. 8 shows another embodiment of the scanning moving member driving force transmission device of the image forming apparatus according to the present invention,
(A) is a plan view, (B) is a side view, and (C) is an explanatory view showing a force acting on a wire.

FIG. 9 is a diagram showing an example of a scanning moving member driving force transmission device of a conventional image forming apparatus.

[Explanation of symbols]

15 Head carriage 18, 48, 58, 68 Guide rail 27, 28 Pulley 29 Wire 31, 31a, 31b Bearing structure 32, 42, 52, 72 Sliding bearing 32a, 32b, 42a, 42b, 52a, 52b, 58
a, 58b Applicable part 62a, 62b Roller

Claims (8)

[Claims] A scanning member having a recording head for forming an image on a recording medium; a guide member extending in the main scanning direction so as to guide the scanning member in the main scanning direction; A driving unit for reciprocating the moving member along the guide member. A driving force transmitting device for a scanning member in an image forming apparatus, wherein one of the scanning member and the guide member has the main scan. At least two different portions in a plane orthogonal to the direction are provided with contact portions that slidably contact the member on the other side, and the driving unit is configured to drive the scanning moving member by a driving force of the driving unit. A driving means for transmitting the driving force of the scanning moving member of the image forming apparatus, wherein the urging means presses the scanning member against the guide member. 2. The scanning moving member according to claim 1, wherein the abutting portion is formed on a bearing structure fixed to the scanning moving member, and the bearing structure is provided at least at two locations in the main scanning direction. A driving force transmitting device for a scanning moving member of an image forming apparatus, comprising: 3. The driving force transmitting device for a scanning moving member of an image forming apparatus according to claim 1, wherein the contact portion of the guide member extends in the main scanning direction. 4. One of the two different contact portions according to claim 1, 2 or 3 is provided on a plane orthogonal to a discharge direction of a recording agent discharged from the recording head. A scanning-moving-member driving force transmission device for an image forming apparatus. 5. The other side of the two different contact portions according to claim 4, wherein the other side is provided on a plane orthogonal to the plane on which the one side contact portion is provided. A scanning member driving force transmission device for an image forming apparatus. 6. A direction in which the scanning moving member is pressed against the guide member by the urging means of claim 1, 2, 3, 4, or 5, from the two different contact portions to the main scanning direction of the guide member. A driving force transmission device for a scanning moving member of an image forming apparatus, wherein the driving force transmission device is provided in parallel with two combined directions toward a central axis. 7. The driving means according to claim 1, further comprising an elongated member for pulling the scanning moving member in a main scanning direction, wherein both ends of the elongated member are provided. A scanning moving member driving force transmission of an image forming apparatus, wherein the scanning moving member is fixed to two places separated in the main scanning direction of the scanning moving member, and is fixed to places far from each other in a pulling direction. apparatus. 8. The driving force transmitting device for a scanning moving member of an image forming apparatus, wherein the elongated member is a wire or a belt.