JP2008220132A - Motor positioning structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor positioning structure to be repaired in a relatively short time at low cost even when a motor or a bracket is broken. <P>SOLUTION: This motor position structure is configured to connect the motor 22 with the bracket 24 on which a transmission gear receiving a driving force of the motor 22 is mounted in a positioned state to each other. The first engagement holes 18d, 18e in which gear studs 24c, 24d for attaching the transmission gear mounted on the bracket 24 are inserted and the second engagement hole 18c in which a motor shaft 22d of the motor 22 is inserted are formed in a positioning fixture portion. The positioning fixture portion is formed at an access cover 18 which constitutes a device in which the motor 22 and the bracket 24 are assembled. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a motor positioning structure for coupling a motor and a bracket to which a transmission gear to which the driving force of the motor is transmitted are positioned in a mutually positioned state.

  In order to couple the motor to the bracket, it is necessary to couple the motor with the gear shaft for attaching the transmission gear and the motor shaft of the motor positioned. For example, in Patent Document 1 below, in order to position the drive shaft that is rotated forward and backward by the scanner motor and the motor, the distance between the drive shaft and the motor shaft of the scanner motor is set to the bracket to which the motor is coupled. A bearing mounting hole for the prescribed drive shaft is provided. The motor is provided with a reference boss, and the scanner motor is positioned relative to the bracket by a motor shaft mounting hole formed in the bracket and the reference boss.

JP 2002-341466 A

  In the above configuration, the bracket can be positioned using the reference boss provided in the motor itself, but there are cases where the positioning function for the motor itself cannot be provided. For example, a case where the motor is coupled to the bracket via a vibration absorbing member such as rubber is applicable. When using rubber or the like, the bracket and the motor are coupled so as not to be in direct contact with each other, so that the bracket and the motor cannot be positioned as they are.

  Therefore, at present, the motor and the bracket are coupled in a state where the motor shaft and the gear shaft for attaching the transmission gear are positioned using a positioning jig. In such a case, if the motor or bracket breaks down, it is necessary to replace the parts. However, once the motor is removed from the bracket, positioning cannot be performed. It became a thing. In order to avoid such trouble, it is only necessary to replace the unit in which the motor and the bracket are combined. However, there is a problem in that even parts that do not need to be replaced are replaced, which increases the burden of repair costs. .

  The present invention has been made in view of the above circumstances, and its problem is to provide a motor positioning structure that can be repaired in a relatively short time even if a motor or bracket breaks down and that can also reduce repair costs. Is to provide.

In order to solve the above problems, the motor positioning structure according to the present invention is:
A motor positioning structure for coupling a motor and a bracket to which a transmission gear to which a driving force of the motor is transmitted is attached in a state where the motor is positioned with respect to each other,
A positioning jig portion in which a first fitting hole into which a gear shaft for mounting a transmission gear to be installed in the bracket is inserted and a second fitting hole into which the motor shaft of the motor is inserted is formed by a motor. And a member constituting a device to which the bracket is assembled.

  The operation and effect of the motor positioning structure having such a configuration will be described. In this configuration, when positioning the motor and the bracket, a member constituting a device to which the motor and the bracket are assembled is used as a positioning jig. In this member, a first fitting hole for attaching a transmission gear and a second fitting hole for a motor shaft are formed, and the positioning of the motor and the bracket can be performed using these. Since this positioning jig part is provided in the member which comprises an apparatus, components of a motor and a bracket can be replaced on the spot, and positioning can also be performed. Therefore, it is not necessary to send it back to the factory and assemble the motor. Moreover, it is not necessary to prepare a positioning-dedicated jig, and repair costs can be reduced. As a result, even if the motor or the bracket breaks down, it is possible to provide a motor positioning structure that can be repaired in a relatively short time and that can also reduce repair costs.

  In the present invention, the motor is preferably one that is coupled to the bracket via a vibration absorbing member.

  In the case of coupling via the vibration absorbing member, the motor and the bracket cannot be positioned directly, but by using a member having the positioning jig as described above, both can be positioned and coupled.

  In this invention, it is preferable that the member which comprises the said apparatus is a cover member which comprises an external appearance part.

  By forming the positioning jig portion on such a cover member, not only can the function as an appearance member be given, but also a function as a jig can be provided, and a dedicated positioning jig need not be provided. Therefore, it can contribute to cost reduction.

  In this invention, it is preferable that the cover member which comprises the said external appearance part is attached to an apparatus after a motor.

  By using the cover member attached after the motor, the motor can be positioned and assembled using the cover member without any trouble in the assembly process. Also, when the repair is performed, the cover member can be opened to take out the motor, so that the cover member can be used without any trouble during the repair.

  In the present invention, the motor is used as a drive source for feeding and transporting the original from the original placing portion in an automatic original feeding device for feeding the original placed on the original placing portion to the image reading position. The member constituting the apparatus is preferably a cover member for covering the automatic document feeder.

  Such an automatic document feeder is provided, for example, in a digital multi-function peripheral, and is provided with a mechanism for feeding a document placed on a document placement unit to an image reading position.

  FIG. 1 is a longitudinal sectional view showing a main part of an automatic document feeder 1 using an ADF in a facsimile machine, a copying machine, or a so-called multi-function machine having both facsimile and copying functions (including a printer function). The automatic document feeder 1 shown in the figure is configured as a double-sided document reading device for reading images on both sides of a sheet-like document D conveyed one by one and outputting them as digital signals. 1 shows that the back side of the paper surface is the front side of the automatic document feeder 1, and the front side of the paper surface is the back side. The motor positioning structure according to the present invention is preferably applied when positioning a motor used in the automatic document feeder.

  A document tray 2b is detachably attached to the document supply port 2a of the automatic document feeder 1 shown in the figure so as to incline downward toward the document supply port 2a. The document supply port 2a and the document tray The document placing portion 2 is configured by 2b. A pickup roller 3 is provided on the document supply port portion 2a to feed out the document D deposited on the document placement portion 2 in the order of pages upward from the upper layer portion. A document separation device 4 for separating and feeding the sheets one by one is provided. The document separation device 4 includes a separation roller 4a and a separation pad 4b urged so as to elastically contact the peripheral body of the separation roller 4a. The document fed out by the pickup roller 3 is introduced between the separation roller 4a and the separation pad 4b, and is separated one by one due to the difference in friction coefficient with respect to the two papers as the separation roller 4a rotates, and is fed downstream. Sent. The compression spring 4c functions to bring the separation pad 4b into elastic contact with the peripheral body of the separation roller 4a. Needless to say, the separating and feeding means 4 includes a separating roller and a retard roller.

  The documents D separated one by one by the document separation device 4 are registered rollers 6, a first transport roller 7 and a second transport roller 8 which are sequentially disposed along a document transport path 5 formed in a U-turn shape. Is conveyed to the first reading point P 1, further fed to the second reading point P 2 by the third conveying roller 9, and discharged to the discharge tray 11 by the discharge roller 10. A platen 12 is arranged at the first reading point P1, and when the document passes over the platen 12, the surface of the document (first reading unit) is read by a reading scanning device (first reading means) 13 that is waiting under the platen 12. Screen image information is sequentially read and output as a digital signal as described above.

  The reading scanning device 13 shown in the figure is configured to be used also as a mobile reading scanning device for a flatbed scanner (FBS). That is, although a part of the illustration is omitted, the FBS portion 14 is coupled to the left side of the broken portion in FIG. In the illustrated example, the reading scanning device 13 is in a standby / static state at the reading position of the ADF document, but when reading the FBS document, it moves into the FBS unit 14, and the FBS unit 14 is moved to the lower surface of the platen glass 15. The image information of the document placed on the platen glass 15 is read by the reading scanning device 13 in the same manner as described above. The image reading device 1, the document tray 2b, and the discharge tray 11 are integrated to form a platen cover, and can be opened and closed up and down with the front side of the paper as a hinge portion (not shown). Accordingly, when the FBS unit 14 reads a document, the platen cover is opened and the document is placed on the exposed platen glass 15.

  As described above, the original whose surface image has been read at the first reading point P1 is further conveyed by the third conveying roller 9 to the second reading point P2, and this second reading point P2 is The contact point between the contact image sensor 16 disposed on the back side of the transported document and the platen roller 17 disposed in contact therewith. That is, the document introduced between the contact image sensor 16 and the platen roller 17 is fed while sliding the reading surface of the contact image sensor 16 by the rotation of the platen roller 17, and during this time, the back surface of the document (second Surface) An image is read by the contact image sensor 16, converted into an electrical signal, and output as a digital signal.

  The separation roller (including the pickup roller 3) 4a, the registration roller 6 and the first conveyance roller 7 constitute a first conveyance system A, and the second conveyance roller 8, the third conveyance roller 9, the platen roller 17 and the discharge roller. Reference numeral 10 constitutes a second transport system B, and the transport systems A and B classified into these two systems use one motor (see FIGS. 2 and 3) 22 as a drive source and drive transmission of two systems described later. Drives are transmitted individually through the means A1 and B1.

  The pickup roller 3 is configured to be driven and transmitted from the drive shaft 4d of the separation roller 4a. Briefly, a frame 3a is attached to the drive shaft 4d via a torque limiter (not shown) so as to be swingable up and down, and a support shaft 3b is supported on the front side of the frame 3a so as to be rotatable. ing. A belt 3d is stretched between a pulley 4e attached to the drive shaft 4d and a pulley 3c attached to the support shaft 3b. The rotation of the support shaft 3b is transmitted to the pickup roller 3 via a one-way clutch (not shown).

  The pickup roller 3 configured as described above is positioned above the frame 3a in the standby state, and when the drive shaft 4d rotates in the forward direction (X direction), the frame 3a has the drive shaft 4d as a fulcrum by the action of the torque limiter. Swings downward. This swinging is stopped when the pickup roller 3 is pressed against the uppermost layer portion of the document D deposited on the document placing portion 2, but the transmission system (pulley 4e, belt) is driven by the continued rotation of the drive shaft 4d. The pickup roller 3 rotates via 3d and the pulley 3c). In this way, while the drive shaft 4d is rotating forward, the pickup roller 3 rotates while being pressed against the uppermost layer portion of the stacked originals D, so that the original document D is sequentially fed out from the uppermost layer portion. Then, once the drive shaft 4d stops and rotates in the reverse direction (counter-X direction), the frame 3a swings upward by the action of the torque limiter, and is held stationary in a standby state by the subsequent stop of the drive shaft 4d.

  The separation roller 4a is driven and transmitted from the drive shaft 4d via a not-shown one-way clutch. Accordingly, the document D is fed out from the pickup roller 3 as described above by the forward rotation of the drive shaft 4d, and the fed document is introduced between the separation roller 4a and the separation pad 4b, one by one as described above. Separated and fed downstream. The document D fed from the separation roller 4a is registered by the registration roller 6 and conveyed further downstream. The peripheral speeds of the rollers 7, 8, 9, 17, and 10 after the registration roller 6 are as follows. The peripheral speed of the separation roller 4 a and the pickup roller 3 is set to be larger than the peripheral speed of the separation roller 4 a and the registration roller 6. Accordingly, when the leading edge of the document D fed from the separation roller 4a reaches the registration roller 6, a transport load (tensile force) is applied to the document due to the difference in peripheral speed. However, the separation roller 4a and the pickup roller 3 are not described above. Thus, a one-way clutch (not shown) is incorporated, whereby both rollers 4a and 3 are idly rotated, and the conveying load is alleviated.

  Pressure rollers 6a, 7a, 8a, 9a and 10a are respectively provided on the registration roller 6, the first to third conveying rollers 7, 8, 9 and the discharge roller 10, and the original is nipped and conveyed by these rollers. The The separation roller 4a and the pickup roller 3 and pressure rollers 6a and 7a associated with the separation roller 4a are attached to the inside of a jam access cover 18 pivotally attached to the hinge pin 18a so as to be opened and closed vertically. Accordingly, when a document jam occurs in the document conveyance path 5 up to the second conveyance roller 8, the jam access cover 18 is opened to connect the separation pad 4b, the registration roller 6, and the first conveyance roller 7. Can be easily removed.

  The second conveying roller 8, the third conveying roller 9, the pressure rollers 8a, 9a, the platen roller 17 and the discharge roller 10 which are paired with the second conveying roller 8, the machine frame 19 forming the machine frame of the platen cover including the ADF, and this It is attached to a cylindrical intermediate inner guide frame 20 fixed to the frame. Further, the contact image sensor 16 and the pressure roller 10a are attached to an intermediate frame 21 pivotally mounted so as to be opened and closed up and down with the drive shaft 6b of the registration roller 6 as a fulcrum. Although the jam clearing of the jammed document between the second transport roller 8 and the third transport roller 9 will be described later, when the jam is generated after the third transport roller 9, the intermediate frame 21 is opened after the jam access cover 18 is opened. If it is opened, the nip relationship between the contact image sensor 16 and the platen roller 17 and between the discharge roller 10 and the pressure roller 10a is released, so that the jammed document can be easily taken out at this portion.

  2 and 3 show a drive transmission mechanism for each of the above rollers, FIG. 2 is a front view thereof (a rear view when viewed from the entire image reading apparatus 1), and FIG. 3 is a plan view thereof. The body frame 19 is fixedly provided with a sheet metal main body frame (rear frame) 23 for a drive transmission mechanism, and the main body frame 23 is provided with the registration roller 6, the first conveying roller 7, the second conveying roller 9, the platen. One end portions of the drive shafts 6b, 7b, 9b, 17a and 10b of the roller 17 and the discharge roller 10 are pivotally supported. Further, the bracket 24 made of sheet metal is fixed to the main body frame 23 with a space therebetween by screwing screws 24b into nut posts 24a fixed to the main body frame 23. Further, the bracket 24 is provided with a motor 22 which is a common drive source for the rollers.

  Gears 6c, 7c, 9c, 17b, and 10c are attached to one end portions of the drive shafts 6b, 7b, 9b, 17a, and 10b of the respective rollers, and an output gear (output shaft) 22a of the motor 22 is attached to these gears. The drive is transmitted via an idler gear or a belt. That is, the large-diameter gear of the two-stage first idler gear 25 meshes with the output gear 22a, and the second idler gear 26 meshes with the small-diameter gear of the first idler gear 25. Further, the third idler gear 27 meshes with the second idler gear 26, thereby establishing a drive transmission system dedicated to the separation roller 4a. That is, a notch 23a is formed on the upper side of the main body frame 23. When the jam access cover 18 is closed, the drive shaft 4d of the separation roller 4a is fitted and held in the notch 23a, and one end of the drive shaft 4d is held. 4f meshes with the third idler gear 27, and rotational drive transmission from the output gear 22a of the motor 22 to the separation roller 4a via the first idler gear 25, the second idler gear 26, and the third idler gear 27 is performed. Made.

  A fourth idler gear 28 meshes with the first idler gear 25, and a first timing belt (toothed belt, the same applies hereinafter) 30 is stretched between the fourth idler gear 28 and the fifth idler gear 29. The gear 6c of the registration roller 6 and the gear 7c of the first transport roller 7 are engaged with the fifth idler gear 29. As a result, a drive transmission system for the registration roller 6 and the first conveyance roller 7 is established, and rotational power is transmitted from the output gear 22 a of the motor 22 to the registration roller 6 and the first conveyance roller 7.

  A further sixth idler gear 31 meshes with the output gear 22a, and a second timing belt 32 is stretched between the sixth idler gear 31 and the gear 9c of the third conveying roller 9, thereby providing an output. Rotational power is transmitted from the gear 22 a to the third transport roller 9 via the sixth idler gear 31 and the second timing belt 32. Further, the drive shaft 9b of the third transport roller 9 is driven and transmitted to the gear 8c of the second transport roller 8 through a gear 9e and a fourth timing belt 37 provided on the front frame 36 side as will be described later. (See FIG. 3). Further, a third timing belt 34 is stretched between the sixth idler gear 31 and the seventh idler gear 33, and the gear 17 a of the platen roller 17 and the gear 10 c of the discharge roller 10 are engaged with the seventh idler gear 33. As a result, the rotational power is transmitted from the output gear 22 a to the platen roller 17 and the discharge roller 10 via the sixth idler gear 31, the third timing belt 34 and the seventh idler gear 33.

  As described above, the drive transmission system from the first idler gear 25 through the second idler gear 26 to the third idler gear 27, and from the first idler gear 25 through the fourth idler gear 28, the first timing belt 30, and the fifth idler gear 29. The drive transmission system that reaches the gear 6c or the gear 7c is a first drive for sequentially driving the first conveyance system A including the separation roller (including the pickup roller 3) 4a, the registration roller 6, and the first conveyance roller 7. A transmission system A1 is configured. Further, a drive transmission system from the sixth idler gear 31 through the second timing belt 32 to the gear 9c and further to the gear 8c, and a drive transmission system from the sixth idler gear 31 through the third timing belt 34 to the gear 17a or the gear 10c. Constitutes a second drive transmission system B1 for sequentially driving the first conveyance system B comprising the second conveyance roller 8, the third conveyance roller 9, the platen roller 17 and the discharge roller 10.

  Most of the first to seventh idler gears 25, 26, 27, 28, 29, 31, and 33 are composed of multi-stage gears, and the diameter (number of teeth) of each gear is such that each roller has a predetermined peripheral speed. Set as appropriate. Also, any idler gear is rotatably mounted on a gear stud that is fixed to the main body frame 23 by caulking or the like, and a part of the gear stud is held by the bracket 24 at the other end. Further, electromagnetic clutches 26a, 6d and 9d are attached to the second idler gear 26, the gear 6c of the registration roller 6 and the gear 9c of the third transport roller 9 in the drive transmission system to the separation roller 4a, respectively. The roller 6 and the third conveyance roller 9 are individually controlled to be turned on / off. In FIG. 2, illustration of these electromagnetic clutches is omitted.

  In FIG. 2, reference numerals 35a, 35b, and 35c denote tension gears that serve to adjust the tension of the first, second, and third timing belts 30, 32, and 34, respectively. These tension gears 35a, 35b, and 35c are mounted on a tension plate 35 that is swingably mounted in a vertical surface area with the drive shaft 6b of the registration roller 6 as a fulcrum. The tension plate 35 is always elastically biased counterclockwise about the drive shaft 6b by a tension spring 35d, whereby the tension gears 35a, 35b, and 35c are respectively first, second, and third. It acts on the timing belts 30, 32, 34 and keeps them always in tension.

  Next, a drive transmission mechanism for the second transport roller 8 will be described. This transmission mechanism is configured on the other end side of the drive shaft 9b of the third transport roller 9 (the front side of the image reading apparatus 1). That is, the drive shaft 9 b of the third transport roller 9 extends across the image reading device 1 to the front side, and a front frame 36 attached to the machine frame 19 holds the front side end portion rotatably. . The front end of the drive shaft 8 b of the second transport roller 8 is also held by the front frame 36. Gears 9e and 8c are attached to the front end portions of the drive shafts 9b and 8b, respectively, and a fourth timing belt 37 is stretched between the gears 9e and 8c. A drive transmission mechanism is established. Accordingly, when the third transport roller 9 is rotationally driven via the drive transmission mechanism, the second transport roller 8 is rotationally driven simultaneously by the drive transmission mechanism.

  As is apparent from the above description, the document conveyance system in the image reading apparatus 1 of the present invention includes the first conveyance system A composed of rollers up to the upstream position of the first reading means (first reading point P1), and It is classified into two transport systems, that is, before and after the reading means (first and second reading points P1 and P2) and the second transport system B including each roller reaching the discharge roller 10, and these two transport systems A, B is rotationally driven in series via two drive transmission systems A1 and B1, respectively. The two drive transmission systems A1 and B1 are connected in a distributed manner from the output shaft 22a of the motor 22 and are individually transmitted to the drive.

<Motor positioning structure>
Next, the positioning structure of the motor 22 will be described. As described above, the output gear 22a of the motor 22 is configured to mesh with the large-diameter gear of the first idler gear 25 and the sixth idler gear 31 at the same time. It is necessary to assemble with high accuracy. When the motor 22 is directly coupled to the bracket 24, the motor 22 and the bracket 24 can be coupled with screws in a state where the motor 22 and the bracket 24 are directly positioned.

  However, there are cases where the motor 22 cannot be positioned with respect to the bracket 24. For example, the motor 22 is coupled to the bracket 24 via a vibration absorbing member. Specifically, a rubber bush 40 (corresponding to a vibration absorbing member) is coupled to the two brackets 24, and the motor 22 is coupled to the rubber bush 40. A motor base plate 22 b is attached to the main body of the motor 22, and is coupled by bolts 41 and nuts 42 using a coupling hole 22 c provided in the motor base plate 22 b.

  A first gear stud 24c for rotatably supporting the first idler gear 25 and a second gear stud 24d for rotatably supporting the sixth idler gear 31 are integrally planted on the bracket 24 by a method such as caulking. Has been. Since the motor 22 is coupled to the bracket 24 via the rubber bush 40, it is difficult to accurately obtain the distance between the motor shaft 22d and the first and second gear studs 24c, 24d. The first and second gear studs 24c and 24d correspond to gear shafts for attaching a transmission gear.

  Therefore, when the motor 22 is coupled to the bracket 24, a positioning jig is required. In the present invention, a positioning jig is not prepared for exclusive use, but as shown in FIG. 5, a positioning jig is provided for the jam access cover 18 (corresponding to a member constituting the device and a cover member constituting the external portion of the device). The tool part is configured. As this positioning jig portion, a first gear stud positioning hole 18d (corresponding to a first fitting hole) into which the first gear stud 24c is inserted, a second gear stud positioning hole 18e into which the second gear stud 24d is inserted, A motor shaft fitting hole 18c (corresponding to a second fitting hole) into which the motor shaft 22d is inserted is integrally formed. Each of these holes is formed as a bag hole, and the shape of the hole cannot be recognized from the appearance side.

  By forming the positioning jig portion on the access cover 18, a dedicated positioning jig is not required. Further, when the motor 22 fails and is replaced, the new motor 22 needs to be positioned and coupled to the bracket 24. However, the positioning and coupling can be performed by using the access cover 18. Therefore, it is possible to save the trouble of sending parts to the factory and assembling them, and the repair cost can be suppressed.

  The access cover 18 is a cover member that is attached after the motor 22. Therefore, the access cover 18 can be assembled after the positioning of the motor 22 using the access cover 18, and can be performed in a normal assembly sequence. Further, when the repair is performed, the access cover 18 is opened to take out the motor 22, so that the access cover 18 can be used without any trouble during the repair.

<Another embodiment>
In the present embodiment, the positioning jig portion is formed on the access cover 18, but the positioning jig portion may be formed on another cover member. Moreover, you may form a positioning jig part in components other than a cover member. For example, a positioning jig portion may be formed on the frame 23.

  In the present embodiment, the configuration example in which the motor 22 is coupled via the rubber bush 40 has been described. However, the present invention can also be applied to the case where a motor that originally does not have a positioning function is coupled to the bracket.

  In the present embodiment, there are two gears that mesh with the output gear 22a, but the number of gears that mesh may be one and is not limited to a specific number.

Vertical sectional view showing an example of an image reading apparatus Front view showing the drive transmission mechanism of each roller Plan view showing drive transmission mechanism of each roller Diagram showing coupling relationship between motor and bracket The figure which shows the example which constituted the positioning jig part in the access cover

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image reading apparatus 2 Original mounting part 3 Pickup roller 4 Separation feeding means 5 Conveyance path 13 Reading scanning apparatus 16 Contact type image sensor 18 Access cover 18c Motor shaft fitting hole 18d First gear stud positioning hole 18e For second gear stud Positioning hole 22 Motor 22a Output gear (output shaft)
22b Motor base plate 24 Bracket 24c First gear stud 24d Second gear stud 40 Rubber bush A First conveyance system A1 First drive transmission mechanism B Second conveyance system B1 Second drive transmission mechanism D Document

Claims (5)

A motor positioning structure for coupling a motor and a bracket to which a transmission gear to which a driving force of the motor is transmitted is attached in a state where the motor is positioned with respect to each other,
A positioning jig portion in which a first fitting hole into which a gear shaft for mounting a transmission gear to be installed in the bracket is inserted and a second fitting hole into which the motor shaft of the motor is inserted is formed by a motor. And a motor positioning structure formed on a member constituting a device to which the bracket is assembled.   The motor positioning structure according to claim 1, wherein the motor is coupled to the bracket via a vibration absorbing member.   The motor positioning structure according to claim 1, wherein the member constituting the device is a cover member constituting an external appearance portion.   The motor positioning structure according to claim 3, wherein the cover member constituting the external appearance part is attached to the apparatus after the motor.   The motor is used as a drive source for feeding and conveying a document from the document placement unit in an automatic document feeder for feeding a document placed on the document placement unit to an image reading position. 5. The motor positioning structure according to claim 1, wherein the member constituting the apparatus is a cover member for covering the automatic document feeder.

Images