JP4351499B2 - Reading carriage driving mechanism and image reading apparatus and copying machine provided with the same - Google Patents

Description

  The present invention relates to a reading carriage driving mechanism for driving a carriage for reading a document, and an image reading apparatus and a copying machine including the reading carriage driving mechanism.

  In the conventional image reading apparatus and copying machine, in order to read an image from a document placed on a document table, a reading scanning module for optically scanning the entire area of the document table is incorporated in the main body device. The scanning module is mounted on a carriage that moves on a rail arranged in parallel below the document table. The carriage is mounted on a shaft of the driving motor by a driving motor for driving. Is moved from a transmission gear meshing with the transmission gear via a drive belt stretched on a transmission pulley attached to a rotation shaft of the transmission gear.

  However, when the scanning module is moved by a drive motor via a transmission gear, a drive belt, etc., vibrations caused by the engagement of the drive motor, the motor gear and the transmission gear, the engagement of the transmission pulley and the drive belt, etc. The main unit is made to resonate by resonance through a member for fixing each component. For this reason, when the original is read by the reading / scanning module, the movement accuracy of the reading / scanning module incorporated in the main body device is deteriorated due to resonance of the main body device, so that the accuracy of the read image information is also deteriorated.

In order to cope with such a problem, as a means for suppressing vibrations of the drive motor, transmission gear, and drive belt from being transmitted to the main unit, for example, between the main unit, the drive motor, and the main unit transmission gear. The thing which interposes a buffer member is implemented (for example, refer to patent documents 1).
Japanese Unexamined Patent Publication No. 2000-287038 (FIGS. 6 and 7)

  However, this conventional technique has the following problems.

  That is, in the conventional technique, the drive motor and the transmission gear are attached to the main body device with the buffer member interposed therebetween, so that the main body device can be prevented from resonating and resonating due to the vibration of the drive motor and the transmission gear.

  However, as shown in FIG. 8, when the drive motor 801 vibrates, the buffer member 802 is deformed, so that the shaft 806 of the transmission gear 805 attached to the main body device 804 with the buffer member 803 interposed therebetween is not displaced. Since the shaft 807 fixed to the main body of the motor 801 is displaced, the shaft 806 of the transmission gear 805 and the shaft 807 of the drive motor 801 are inclined, and the engagement between the motor gear 808 and the transmission gear 805 is displaced.

  For this reason, the rotation of the shaft 807 of the drive motor 801 is not properly transmitted, and the reading accuracy of the reading scanning module is deteriorated when the original is read by the reading scanning module, and the accuracy of the read image information is also deteriorated. Such a problem occurs.

  The present invention has been made in view of such problems, and avoids a decrease in movement accuracy of the reading carriage due to the transmission of vibration by the driving motor and the transmission gear to the main body device in which the reading carriage is incorporated and the deformation of the buffer member. Another object of the present invention is to provide a reading carriage driving mechanism that can read an image with high-resolution and high-accuracy image quality, and an image reading apparatus and a copying machine including the reading carriage driving mechanism.

  The present invention includes a reading carriage that is incorporated in a main body apparatus and moves in a sub-scanning manner while reading information on a document in units of main scanning lines, a driving source having a driving shaft that rotates around a bearing, and rotation of the driving shaft of the driving source. In the reading carriage driving mechanism, the driving source is an anti-vibration elastic body. The transmission means is attached to a drive source fixed to the main body device.

  The present invention avoids a decrease in the movement accuracy of the reading carriage due to the transmission of the vibration of the drive motor and transmission gear to the main body device in which the reading carriage is incorporated and the deformation of the buffer member, and allows the image to be obtained with high resolution and high accuracy image quality. Can be read.

  A reading carriage driving mechanism according to a first aspect of the present invention includes a reading carriage that is incorporated in a main body apparatus and moves in a sub-scanning manner while reading information on a document in units of main scanning lines, and a driving shaft that rotates around a bearing. A driving source; a moving unit that moves the reading carriage in a sub-scanning manner according to the rotation of the driving shaft; and a transmission unit that is connected to the driving shaft and transmits the rotation of the driving shaft to the moving unit. The drive source is fixed to the main body device via a vibration-proof elastic body, and the transmission means is attached to the drive source fixed to the main body device.

  According to this configuration, since the driving source is fixed to the main body device via the vibration-proof elastic body, it is possible to prevent the vibration of the driving source from being transmitted to the main body device in which the reading carriage is incorporated. Further, since the transmission means is attached not to the main body device but to a drive source fixed to the main body device, the vibration of the vibration-proof elastic body causes vibration of the transmission means to move to the main body device in which the reading carriage is incorporated. It can be prevented from being transmitted. Furthermore, since the transmission means is attached to a drive source fixed to the main body device, the drive shaft and the transmission means are affected even if the vibration-proof elastic body is deformed due to vibration of the drive source. Instead, the drive shaft and the transmission means connected to the drive shaft are displaced in the same direction. Therefore, the engagement between the drive shaft and the transmission means is not displaced, and the situation where the transmission means is eccentric can be reliably avoided. Therefore, by stabilizing the operation of the reading carriage, it is possible to read an image with high resolution and high accuracy image quality.

  According to a second aspect of the present invention, in the reading carriage drive mechanism according to the first aspect, the drive shaft has a first helical gear, and the transmission means meshes with the first helical gear. The second helical gear and the helical pulley, and a shaft that rotatably holds them, and the moving means has a helical belt that meshes with the helical pulley.

  According to this configuration, since the gears in the drive transmission system and the pulleys and the belts are meshed in a helical shape, the meshing rate is increased and vibration during meshing can be suppressed.

  According to a third aspect of the present invention, in the reading carriage driving mechanism according to the first aspect, a damper with a flywheel is provided at the end of the driving shaft opposite to the end connected to the transmission means. .

  According to this configuration, even if rotation unevenness occurs on the drive shaft due to vibration of the drive source or the like, the rotation unevenness is absorbed by the damper with the flywheel, so that the occurrence of rotation unevenness can be suppressed.

  According to a fourth aspect of the present invention, in the reading carriage drive mechanism according to the first aspect, the transmission means includes a shaft that rotatably holds the transmission means, and a holding member fixed to the drive source. A configuration is adopted in which the transmission unit is connected to the drive shaft in a step of being attached to the drive source and holding the transmission means on the shaft of the holding member.

  According to this configuration, since the transmission means is coupled to the drive shaft in the step of holding the transmission means on the holding member, the transmission means is easily and easily held on the holding member and driven without requiring a special mechanism. Can be connected to a shaft.

  According to a fifth aspect of the present invention, in the reading carriage driving mechanism according to the fourth aspect, the holding member is made of metal.

  According to this configuration, even when heat due to rotation is generated in the drive source, heat can be radiated by the metallic holding member fixed to the drive source, so that the failure due to the heat of the drive source can be suppressed.

  An image reading apparatus according to a sixth aspect of the present invention includes a reading carriage that is incorporated in a main body apparatus and moves in a sub-scanning manner while reading information on a document in units of main scanning lines, and a drive shaft that rotates around a bearing as a fulcrum. A source, a moving means for moving the reading carriage in a sub-scanning manner according to the rotation of the driving shaft, and a transmitting means connected to the driving shaft and transmitting the rotation of the driving shaft to the moving means, The drive source is fixed to the main body device via a vibration-proof elastic body, and the transmission means is attached to the drive source fixed to the main body device.

  According to this configuration, since the driving source is fixed to the main body device via the vibration-proof elastic body, it is possible to prevent the vibration of the driving source from being transmitted to the main body device in which the reading carriage is incorporated. Further, since the transmission means is attached not to the main body device but to a drive source fixed to the main body device, the vibration of the vibration-proof elastic body causes vibration of the transmission means to move to the main body device in which the reading carriage is incorporated. It can be prevented from being transmitted. Furthermore, since the transmission means is attached to a drive source fixed to the main body device, the drive shaft and the transmission means are affected even if the vibration-proof elastic body is deformed due to vibration of the drive source. Instead, the drive shaft and the transmission means connected to the drive shaft are displaced in the same direction. Therefore, the engagement between the drive shaft and the transmission means is not displaced, and the situation where the transmission means is eccentric can be reliably avoided. Therefore, by stabilizing the operation of the reading carriage, it is possible to read an image with high resolution and high accuracy image quality.

  According to a seventh aspect of the present invention, in the image reading apparatus according to the sixth aspect, the drive shaft has a first helical gear, and the transmission means meshes with the first helical gear. It has a second helical gear and a helical pulley and a shaft that rotatably holds them, and the moving means has a helical belt that meshes with the helical pulley.

  According to this configuration, since the gears in the drive transmission system and the pulleys and the belts are meshed in a helical shape, the meshing rate is increased and vibration during meshing can be suppressed.

  According to an eighth aspect of the present invention, in the image reading device according to the sixth aspect, a damper with a flywheel is provided at the end of the drive shaft opposite to the end connected to the transmission means.

  According to this configuration, even if rotation unevenness occurs on the drive shaft due to vibration of the drive source or the like, the rotation unevenness is absorbed by the damper with the flywheel, so that the occurrence of rotation unevenness can be suppressed.

  According to a ninth aspect of the present invention, in the image reading apparatus according to the sixth aspect, the transmission means includes a shaft that rotatably holds the transmission means, and a holding member fixed to the drive source. A configuration is adopted in which the transmission unit is connected to the drive shaft in a step of being attached to the drive source and holding the transmission means on the shaft of the holding member.

  According to this configuration, since the transmission means is coupled to the drive shaft in the step of holding the transmission means on the holding member, the transmission means is easily and easily held on the holding member and driven without requiring a special mechanism. Can be connected to a shaft.

  According to a tenth aspect of the present invention, in the image reading apparatus according to the ninth aspect, the holding member is metallic.

  According to this configuration, even when heat due to rotation is generated in the drive source, heat can be radiated by the metallic holding member fixed to the drive source, so that the failure due to the heat of the drive source can be suppressed.

  A copying machine according to an eleventh aspect of the present invention is a drive source having a reading carriage that is incorporated in a main unit and moves in a sub-scanning manner while reading information on a document in units of main scanning lines, and a drive shaft that rotates about a bearing. And a moving means for moving the reading carriage in a sub-scanning direction according to the rotation of the drive shaft, and a transmission means connected to the drive shaft for transmitting the rotation of the drive shaft to the moving means. The source is fixed to the main body device via a vibration-proof elastic body, and the transmission means is attached to the drive source fixed to the main body device.

  According to this configuration, since the driving source is fixed to the main body device via the vibration-proof elastic body, it is possible to prevent the vibration of the driving source from being transmitted to the main body device in which the reading carriage is incorporated. Further, since the transmission means is attached not to the main body device but to a drive source fixed to the main body device, the vibration of the vibration-proof elastic body causes vibration of the transmission means to move to the main body device in which the reading carriage is incorporated. It can be prevented from being transmitted. Furthermore, since the transmission means is attached to a drive source fixed to the main body device, the drive shaft and the transmission means are affected even if the vibration-proof elastic body is deformed due to vibration of the drive source. Instead, the drive shaft and the transmission means connected to the drive shaft are displaced in the same direction. Therefore, the engagement between the drive shaft and the transmission means is not displaced, and the situation where the transmission means is eccentric can be reliably avoided. Therefore, by stabilizing the operation of the reading carriage, it is possible to read an image with high resolution and high accuracy image quality.

  According to a twelfth aspect of the present invention, in the copying machine according to the eleventh aspect, the drive shaft has a first helical gear, and the transmission means meshes with the first helical gear. The helical gear has two helical gears and a helical pulley and a shaft that rotatably holds them, and the moving means has a helical belt that meshes with the helical pulley.

  According to this configuration, since the gears in the drive transmission system and the pulleys and the belts are meshed in a helical shape, the meshing rate is increased and vibration during meshing can be suppressed.

  According to a thirteenth aspect of the present invention, in the copying machine according to the eleventh aspect, a damper with a flywheel is provided at the end of the drive shaft opposite to the end connected to the transmission means.

  According to this configuration, even if rotation unevenness occurs on the drive shaft due to vibration of the drive source or the like, the rotation unevenness is absorbed by the damper with the flywheel, so that the occurrence of rotation unevenness can be suppressed.

  A fourteenth aspect of the present invention is the copying machine according to the eleventh aspect, wherein the transmission means includes a shaft that rotatably holds the transmission means, and is driven via a holding member fixed to the drive source. A configuration is adopted in which the transmission member is connected to the drive shaft in a step of being attached to the source and holding the transmission means on the shaft of the holding member.

  According to this configuration, since the transmission means is coupled to the drive shaft in the step of holding the transmission means on the holding member, the transmission means is easily and easily held on the holding member and driven without requiring a special mechanism. Can be connected to a shaft.

  According to a fifteenth aspect of the present invention, in the copying machine according to the fourteenth aspect, the holding member is metallic.

  According to this configuration, even when heat due to rotation is generated in the drive source, heat can be radiated by the metallic holding member fixed to the drive source, so that the failure due to the heat of the drive source can be suppressed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a copying machine 100 equipped with an image reading apparatus (unit) provided with a reading carriage driving mechanism according to an embodiment of the present invention.

  In the copier 100 shown in FIG. 1, an image reading unit 101 having a reading carriage driving mechanism according to the present embodiment is provided at the upper part of the apparatus main body, and performs paper feeding, transfer, recording, and fixing processes below it. A main body unit 102 is provided.

  A plurality of paper feed cassettes 103 to 105 are installed below the main unit 102. The uppermost sheet is taken out from the sheet bundle set in the sheet feeding cassettes 103 to 105 by a pickup roller (not shown). The paper taken out from the paper feed cassettes 103 to 105 is transported to a transport roller 109 by paper feed rollers 106 to 108 on a paper path formed upward from the bottom of the main unit 102.

  The sheet conveyed by the conveyance roller 109 is transferred to the registration roller 110. A photosensitive drum 111 is disposed at the paper conveyance destination by the registration roller 110. In the vicinity of the photosensitive drum 111, a charger 112 for uniformly charging the surface of the photosensitive drum 111, an LSU (Laser Scan Unit) 113, and an LSU 113 for forming an electrostatic latent image on the charged surface of the photosensitive drum 111 are provided. A developer 114 that forms a toner image by attaching toner to the formed electrostatic latent image, a transfer device 115 that transfers the toner image formed on the surface of the photosensitive drum 111 to a sheet to be conveyed, and transfer of the toner image A cleaning unit 116 for cleaning the surface of the subsequent photosensitive drum 111 is disposed.

  The sheet on which the toner image is transferred is sent to the fixing unit 118 by the transport belt 117. The fixing unit 118 includes a fixing roller 119 and a pressure roller 120 disposed to face the fixing roller 119. The fixing roller 119 applies heat to the recording surface of the paper, and the pressure roller 120 presses the paper against the fixing roller 119, whereby the toner image is fixed on the paper. The paper discharged from the fixing unit 118 is discharged onto the paper discharge tray 122 by the discharge roller 121.

  The image reading unit 101 includes an original table glass 123 on which an original D is placed. A reading carriage driving mechanism is provided inside the original table glass 123. This reading carriage driving mechanism is composed of a reading carriage that moves in a sub-scanning manner while reading information on the document D in units of main scanning lines, and a driving block that will be described later. The image reading unit 101 includes a constant speed unit 124 and a half speed unit 125 that move inside the document table glass 123 in the sub-scanning direction (left-right direction shown in FIG. 1). The reading carriage is attached to the constant velocity unit 124.

  A driving wire 128 stretched around a driving wire drum 126 and a driven wire drum 127 is connected to the constant speed unit 124 and the half speed unit 125. The constant speed unit 124 and the half speed unit 125 move in the sub-scanning direction according to the rotation of the drive wire drum 126. The half speed unit 125 is set to move at half the speed of the constant speed unit 124. Thereby, between the document D on the platen glass 123 and the mirror M1 of the constant speed unit 124, between the mirror M1 of the constant speed unit 124 and the mirror M2 of the half speed unit 125, and the mirror M2 of the half speed unit 125, The total distance between the mirror M3 and the distance between the mirror M3 of the half-speed unit 125 and the image sensor 130 via the lens 129 is always kept constant.

  2 and 3 are a schematic top view and a schematic perspective view, respectively, of the image reading unit 101 according to the present embodiment.

  As shown in the figure, the drive wire drum 126 is connected to a drive block 201 that drives the drive wire drum 126. The drive block 201 is composed of a drive motor 202 as a drive source, a transmission gear 204 as a transmission means that meshes with a motor gear 203 attached to one end of a drive shaft of the drive motor 202, and the transmission gear 204. A transmission pulley 206 on which one end of the drive belt 205 is stretched, a drive pulley 207 on which the other end of the drive belt 205 is stretched, and a rotation shaft 208 fixed to the drive pulley 207. Since the rotation shaft 208 is fixed to the drive wire drum 126, the drive of the drive block 201 is transmitted to the drive wire drum 126.

  FIG. 4 is an enlarged view of the drive block 201 of the reading carriage drive mechanism according to the present embodiment.

  As shown in the figure, the drive block 201 is attached to the main body frame of the image reading unit 101 by the motor bracket 401 on the surface on the motor gear 203 side. More specifically, the motor gear 203, the transmission gear 204, and the transmission pulley 206 are attached to the motor bracket 401 in a form protruding to the image reading unit 101 side. The motor bracket 401 is fixed to the housing of the image reading unit 101. In FIG. 2 and FIG. 3, the motor bracket 401 is omitted.

  The motor gear 203 of the drive motor 202, the transmission gear 204 and the transmission pulley 206 that mesh with the motor gear 203 are each constituted by a helical gear, as shown in FIG. Similarly, the drive belt 205 that meshes with the transmission pulley 206 is also a helical belt. Thus, since the gears in the drive transmission system and the pulley and the belt are meshed in a helical shape, the meshing rate is increased and vibration during meshing can be suppressed.

  FIG. 5 is an assembly diagram of the main part of the drive block 201 of the reading carriage drive mechanism according to the present embodiment.

  When the drive block 201 is assembled, as shown in the figure, first, a metal plate 501 as a holding member for the transmission gear 204 and the transmission pulley 206 is put on the drive motor 202. An opening 502 is formed in the metal plate 501 corresponding to the motor gear 203 of the drive motor 202. A cylindrical step portion 513 that fits into the opening 502 is formed at the end of the drive motor 202 on the motor gear 203 side. Further, a shaft 503 that rotatably holds the transmission gear 204 and the transmission pulley 206 is provided. A groove of an E-ring 512 (to be described later) for fixing the transmission gear 204 and the like is formed at the tip of the shaft 503.

  An anti-vibration member 506 is placed on the metal plate 501 by sandwiching a rubber 504 as an anti-vibration elastic body between the pair of metal plates 505A and 505B. Also in the vibration isolation member 506, a position corresponding to the motor gear 203 of the drive motor 202 is opened. In the present embodiment, rubber 504 is described as an example of the vibration-proof elastic body, but the present invention is not limited to this. Then, the metal plate 501 and the vibration isolation member 506 are fixed to the drive motor 202 with screws 507 from the screw holes of the metal plate 505A on the metal plate 501 side.

  Thereafter, the drive motor 202 to which the vibration isolating member 506 is fixed is fixed to the motor bracket 401. Specifically, the screw 508 is fixed from the motor bracket 401 side to the screw hole of the metal plate 505B on the motor bracket 401 side. An opening 509 is formed in the motor bracket 401 at a position corresponding to the motor gear 203 of the drive motor 202. An opening 510 is formed at a position corresponding to the shaft 503 of the metal plate 501.

  When the drive motor 202 is fixed to the motor bracket 401, the motor gear 203 and the shaft 503 project from the openings 509 and 510 formed in the motor bracket 401, respectively. Then, the transmission gear 204 and the transmission pulley 206 are attached to the shaft 503 protruding from the opening 510. At this time, the transmission gear 204 meshes with the motor gear 203. As described above, the transmission gear 204 or the like can be engaged with the shaft 503 on the metal plate 501 fixed to the drive motor 202, so that it can be engaged with the motor gear 203. Therefore, troublesome positioning work is required when these gears are engaged with each other. Can be omitted. And it fixes to the front-end | tip part of the axis | shaft 503 which penetrated this transmission gear 204 and the transmission pulley 206 with the E ring 512 via the washer 511. FIG.

  FIG. 6 is a top view of the main part of the drive block 201 of the reading carriage drive mechanism according to the present embodiment after assembly.

  When the assembly is completed, as shown in the figure, the drive block 201 is in a state where the teeth of the motor gear 203 and the teeth of the transmission gear 204 are engaged. In the assembled state, the shaft 503 for holding the transmission gear 204 and the like is provided at a fixed position on the metal plate 501 as described above. On the other hand, the metal plate 501 is fixed to the drive motor 202 with screws. For this reason, the drive shaft of the drive motor 202 and the shaft 503 always maintain a fixed positional relationship. Therefore, even when the rubber 504 of the vibration isolation member 506 between the drive motor 202 and the motor bracket 401 is displaced due to vibration of the drive motor 202, the motor gear 203 and the transmission gear 204 of the drive motor 202 are always in contact with each other. It will be maintained in a meshed state.

  The drive block 201 of the reading carriage drive mechanism according to the present embodiment includes a damper-equipped flywheel 601 at the end of the drive shaft of the drive motor 202 opposite to the transmission gear 204 and the like. By providing the flywheel damper 601 at the end of the drive motor 202 in this way, even if rotation unevenness occurs on the drive shaft due to vibration of the drive motor 202, the rotation unevenness is absorbed by the flywheel damper 601. The occurrence of uneven rotation can be suppressed.

  In the reading carriage driving mechanism according to the present embodiment, the holding member attached to the driving motor 202 is made of metal (metal plate 501). For this reason, even when heat is generated by rotation in the drive motor 202, the heat can be dissipated by the metal plate 501, so that the trouble due to heat of the drive motor 202 can be suppressed.

  FIG. 7 is a diagram for explaining a state in which the rubber 504 is displaced in the drive block 201 of the reading carriage drive mechanism according to the embodiment. In FIG. 7, the case where the upper part of the rubber 504 in the figure is displaced to the left side will be considered. In FIG. 7, the configuration of the drive block 201 is simplified for convenience of explanation.

  As shown in the figure, when the rubber 504 is displaced, the drive shaft of the drive motor 202 is tilted downward in the drawing by the displacement of the rubber 504. However, the vibration isolation member 506 including the displaced rubber 504 is fixed to a metal plate 501 fixed to the drive motor 202. Therefore, the metal plate 501 is also inclined. For this reason, the tip of the shaft 503 provided on the metal plate 501 is similarly inclined. As a result, the motor gear 203 fixed to the drive shaft of the drive motor 202 and the transmission gear 204 attached to the shaft 503 maintain a certain positional relationship.

  As described above, according to the reading carriage driving mechanism according to the present embodiment, the driving motor 202 is fixed to the motor bracket 401 via the vibration isolating member 506 including the rubber 504, and therefore the vibration of the driving motor 202 is read. It is possible to prevent the carriage from being transmitted to the main body frame in which the carriage is incorporated.

  Further, since the transmission gear 204 and the transmission pulley 206 are attached to the drive motor 202 fixed to the motor bracket 401, vibrations of the transmission gear 204 and the like are caused by the vibration isolation effect of the vibration isolation member 506 provided with the rubber 504. It is possible to prevent transmission to the main body frame to be incorporated.

  Further, the transmission gear 204 and the like are attached not to the motor bracket 401 but to the drive motor 202. For this reason, even when the rubber 504 is deformed due to vibration of the drive motor 202 or the like, the drive shaft of the drive motor 202 and the transmission gear 204 are not affected by any influence, and the motor gear 203 of the drive shaft and the motor gear 203 are not affected. Are displaced in the same direction as the transmission gear 204 meshing with the transmission gear 204. Accordingly, the meshing between the motor gear 203 and the transmission gear 204 is not displaced, and the situation where the transmission gear 204 is eccentric can be reliably prevented. As a result, the operation of the reading carriage can be stabilized, so that an image can be read with high resolution and high accuracy image quality.

  In particular, in the image reading unit 101 according to the present embodiment, the transmission gear 204 is fixed to the drive motor 202 by fitting the cylindrical step 513 of the drive motor 202 into the opening 502 of the metal plate 501. It is provided so as to be engaged with the motor gear 203 reliably and with high accuracy while being rotatably held by the shaft 503 on the metal plate 501 formed. For this reason, the transmission gear 204 can be meshed with the motor gear 203 simply by attaching the transmission gear 204 to the shaft 503. Therefore, the transmission gear 204 can be meshed with the motor gear 203 easily and easily without requiring a special mechanism.

  In the present embodiment, a configuration is described in which the transmission gear 204 and the like are attached to the drive motor 202 via the shaft 503 on the metal plate 501, and the transmission gear 204 and the like are integrated with the drive motor 202. However, the present invention is not limited to this, and the transmission gear 204 or the like may be directly attached to a predetermined position of the drive motor 202 without the metal plate 501 as long as the drive motor 202 and the transmission gear 204 or the like can be realized as an integrated configuration. Even if it is a case where it changes in this way, the effect similar to this Embodiment can be acquired.

  The reading carriage driving mechanism and the image reading apparatus and copying machine having the same according to the present invention transmit the vibration of the driving motor and the transmission gear to the main body apparatus in which the reading carriage is incorporated and the movement accuracy of the reading carriage by the deformation of the buffer member. This is useful in that the image can be read with high resolution and high accuracy image quality while avoiding the deterioration.

1 is a schematic configuration diagram of a copier equipped with an image reading apparatus (unit) including a reading carriage driving mechanism according to an embodiment of the present invention. Schematic top view of the image reading unit according to the above embodiment Schematic perspective view of the image reading unit according to the above embodiment The enlarged view of the drive block of the reading carriage drive mechanism concerning the above-mentioned embodiment Assembly drawing of main part of drive block of reading carriage drive mechanism according to above embodiment The top view after the assembly of the principal part of the drive block of the reading carriage drive mechanism concerning the above-mentioned embodiment The figure for demonstrating the state when rubber | gum is displaced in the drive block of the reading carriage drive mechanism which concerns on the said embodiment. The figure for demonstrating the state around a drive gear when the buffer member is displaced in the conventional image reading apparatus.

Explanation of symbols

100 copier 101 image reading device (unit)
DESCRIPTION OF SYMBOLS 102 Main body unit 123 Original plate glass 124 Constant speed unit 125 Half speed unit 201 Drive block 202 Drive motor 203 Motor gear 204 Transmission gear 205 Drive belt 206 Transmission pulley 207 Drive pulley 208 Drive shaft 401 Motor bracket 501 Metal plate 503 Shaft 504 Rubber 506 Vibration member 513 Stepped portion 601 Damper with flywheel

Claims (15)

  A reading carriage that is incorporated in the main unit and moves in a sub-scanning manner while reading information on a document in units of main scanning lines, a driving source having a driving shaft that rotates around a bearing, and the reading carriage according to the rotation of the driving shaft Moving means for sub-scanning movement, and transmission means connected to the drive shaft and transmitting the rotation of the drive shaft to the movement means, and the drive source is connected to the main body device via a vibration-proof elastic body. The reading carriage driving mechanism is fixed, and the transmission means is attached to the driving source fixed to the main unit.   The drive shaft has a first helical gear, and the transmission means rotatably holds a second helical gear and a helical pulley that mesh with the first helical gear. The reading carriage driving mechanism according to claim 1, wherein the moving unit has a helical belt meshing with the helical pulley.   2. The reading carriage driving mechanism according to claim 1, further comprising a damper with a flywheel at an end opposite to the end connected to the transmission means in the drive shaft.   The transmission means is a step of attaching the transmission means to the drive source via a holding member that includes a shaft that rotatably holds the transmission means and is fixed to the drive source, and holding the transmission means on the shaft of the holding member. The reading carriage driving mechanism according to claim 1, wherein the reading carriage driving mechanism is connected to the driving shaft.   The reading carriage driving mechanism according to claim 4, wherein the holding member is made of metal.   A reading carriage that is incorporated in the main unit and moves in a sub-scanning manner while reading information on a document in units of main scanning lines, a driving source having a driving shaft that rotates around a bearing, and the reading carriage according to the rotation of the driving shaft Moving means for sub-scanning movement, and transmission means connected to the drive shaft and transmitting the rotation of the drive shaft to the movement means, and the drive source is connected to the main body device via a vibration-proof elastic body. The image reading apparatus is fixed, and the transmission means is attached to the driving source fixed to the main body apparatus.   The drive shaft has a first helical gear, and the transmission means rotatably holds a second helical gear and a helical pulley that mesh with the first helical gear. The image reading apparatus according to claim 6, further comprising a helical belt that meshes with the helical pulley.   The image reading apparatus according to claim 6, further comprising a flywheel damper at an end of the drive shaft opposite to the end connected to the transmission unit.   The transmission means is a step of attaching the transmission means to the drive source via a holding member that includes a shaft that rotatably holds the transmission means and is fixed to the drive source, and holding the transmission means on the shaft of the holding member. The image reading apparatus according to claim 6, wherein the image reading apparatus is connected to the drive shaft.   The image reading apparatus according to claim 9, wherein the holding member is metallic.   A reading carriage that is incorporated in the main unit and moves in a sub-scanning manner while reading information on a document in units of main scanning lines, a driving source having a driving shaft that rotates around a bearing, and the reading carriage according to the rotation of the driving shaft Moving means for sub-scanning movement, and transmission means connected to the drive shaft and transmitting the rotation of the drive shaft to the movement means, and the drive source is connected to the main body device via a vibration-proof elastic body. The copying machine is fixed, and the transmission means is attached to the drive source fixed to the main unit.   The drive shaft has a first helical gear, and the transmission means rotatably holds a second helical gear and a helical pulley that mesh with the first helical gear. 12. The copying machine according to claim 11, further comprising a helical tooth belt that meshes with the helical pulley.   12. The copying machine according to claim 11, further comprising a damper with a flywheel at an end of the drive shaft opposite to the end connected to the transmission means.   The transmission means is a step of attaching the transmission means to the drive source via a holding member that includes a shaft that rotatably holds the transmission means and is fixed to the drive source, and holding the transmission means on the shaft of the holding member. 12. The copier according to claim 11, wherein the copier is connected to the drive shaft.   15. The copying machine according to claim 14, wherein the holding member is metallic.

Images