JP2008074610A - Base position adjusting tool and method of mounting sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a space required for positioning a base to which a sensor is fixed while maintaining the accuracy of the mounting positions of a transmission part and a receiving part. <P>SOLUTION: This base position adjusting tool comprises a first positioning member 81 positioned, by fitting into an opening 41A, relative to a first base 41 on which a transmitter 38 for outputting ultrasonic wave to a receiver 39 is positioned by fitting it into the opening 41A; and a second positioning member 82 positioned, by fitting into an opening 42A, relative to a second base on which a receiver 39 for receiving the ultrasonic wave output by the transmitter 38 and positioned opposite to the transmitter 38 at an interval is positioned by fitting into the opening 42A. The first base 41 and the second base 42 are positioned relative to each other in the state that the first base 41 and the second base 42 are fitted to each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pedestal position adjustment jig for positioning a pedestal device having a transmitting section and a receiving section and fixing a sensor such as an ultrasonic sensor or an optical sensor, and the pedestal position adjustment jig. The present invention relates to a sensor mounting method for mounting a sensor to an apparatus.

  A sensor such as an ultrasonic sensor or an optical sensor includes a transmission unit that outputs a signal such as an ultrasonic wave or light, and a reception unit that receives the signal, and detects double feeding or the like of the conveyed paper. Therefore, in order to accurately detect a detection object such as paper, the accuracy of the mounting position of the transmitter and the receiver is required.

  Conventionally, the attachment of the sensor has been performed by finely adjusting the attachment position of the transmission unit and the reception unit while an operator confirms the reception state of the reception unit in the manufacturing process of the apparatus. For this reason, it took a lot of work time and was inefficient.

Therefore, in recent sensor mounting methods, there is a configuration in which a casing on which a transmitter and a receiver are fixed is fixed to an apparatus while being positioned using a sensor mounting jig (see, for example, Patent Document 1). .) The sensor mounting jig has two positioning pins extending from the block. A part of the positioning pin passes through two through holes formed in the casing and is inserted into a positioning hole formed on the apparatus side to determine the position of the casing. With the positioning pin inserted, the screw passes through a screw fixing hole provided separately in the housing and is screwed into the apparatus.
Japanese Patent Laid-Open No. 11-2957

  However, in the configuration of the above-described Patent Document 1, it is necessary to form a positioning hole on the apparatus side to which the sensor is attached, and it is necessary to provide a through hole for penetrating the positioning pin in the housing. Therefore, the space for the positioning holes and the space for arranging the housing are required for the apparatus, and the apparatus becomes large.

  An object of the present invention is to provide a pedestal position adjusting jig and a pedestal position that can reduce the space required for positioning a pedestal for fixing a sensor while maintaining the accuracy of the mounting positions of the transmitter and the receiver. The object is to provide a sensor mounting method for mounting a sensor using an adjustment jig.

  In order to solve the above problems, the present invention has the following configuration.

  (1) The pedestal position adjusting jig of the present invention includes a first positioning member and a second positioning member. The first positioning member is a transmitter that outputs a signal in a predetermined direction in space, or a receiver that receives a signal output by the transmitter, and is provided with a gap between the transmitter and the receiver in the predetermined direction. One is positioned at the first predetermined position via the first positioning means with respect to the first pedestal having the first predetermined position positioned via the first positioning means. The second positioning member is moved to the second predetermined position via the second positioning means with respect to the second pedestal having the second predetermined position where one of the receiving part or the transmitting part is positioned via the second positioning means. Positioned. The first positioning member and the second positioning member are fitted in a predetermined direction while being positioned on the first pedestal and the second pedestal.

  In this configuration, the first positioning member and the second positioning member are fitted in a state in which they are positioned at the first predetermined position and the second predetermined position of the first base and the second base instead of the transmitter and the receiver. Match. By this fitting, the first pedestal and the second pedestal are positioned relative to each other. By fixing the first pedestal and the second pedestal in this state, the positional accuracy of the transmitting unit and the receiving unit attached by removing the first positioning member and the second positioning member is secured. Moreover, since it is the state which fitted, when fixing, the position of a 1st base and a 2nd base is hard to shift | deviate, and fixation becomes easy.

  Furthermore, since the first positioning member and the second positioning member are positioned using the first positioning means and the second positioning means for positioning the transmitting section and the receiving section, it is necessary to form a new positioning hole. In addition, the size of the first pedestal and the second pedestal is not increased only for positioning. In addition, since the first positioning member and the second positioning member use positioning means for positioning the transmitting portion and the receiving portion, the positioning of the first pedestal and the second pedestal becomes more accurate.

  (2) In the configuration of (1) above, the first positioning member has a through hole and is externally fitted to the second positioning member positioned below.

  In this configuration, the lower second positioning member is fitted into the through hole of the first positioning member. When the first positioning member is externally fitted to the second positioning member, the operator can externally fit the second positioning member while looking through the inside of the through hole from the upper end side and viewing the first positioning member. Therefore, the operator can easily fit the first positioning member and the second positioning member.

  (3) In the configuration of (2), the second positioning member includes a penetrating portion that penetrates the first positioning member, and the penetrating portion is provided with an index that represents the amount of protrusion.

  In this configuration, the second positioning member is fitted into the first positioning member, and the penetrating portion constituting a part of the second positioning member passes through the through hole of the first positioning member. Since an index indicating the amount of protrusion is provided in the penetrating portion, the distance between the first pedestal and the second pedestal in a state where the first positioning member and the second positioning member are fitted is visually observed by an operator. The

  (4) The sensor mounting method of this invention includes a member positioning step and a pedestal positioning step. The member positioning step is one of a transmitting unit that outputs a signal in a predetermined direction in space, or a receiving unit that receives a signal output by the transmitting unit and that is opposed to the transmitting unit in a predetermined direction with a gap. The second positioning member is positioned at the second predetermined position via the second positioning means with respect to the second base having the second predetermined position positioned via the second positioning means. In the pedestal positioning step, the first positioning member is moved to the first predetermined position via the first positioning means with respect to the first pedestal where one of the receiving part or the transmitting part is positioned at the first predetermined position via the first positioning means. Positioning at a predetermined position and fitting the first positioning member and the second positioning member in a predetermined direction.

  In this configuration, instead of the transmitter and the receiver, the first positioning member and the second positioning member are positioned at the first predetermined position and the second predetermined position of the first base and the second base, and The first positioning member and the second positioning member are fitted. By this fitting, the first pedestal and the second pedestal are positioned relative to each other. By fixing the first pedestal and the second pedestal in this state, the positional accuracy of the transmitting unit and the receiving unit attached by removing the first positioning member and the second positioning member is secured. Moreover, since it is the state which fitted, when fixing, the position of a 1st base and a 2nd base is hard to shift | deviate, and fixation becomes easy.

  Further, since the first positioning member and the second positioning member are positioned by using the first positioning means and the second positioning means for positioning the transmitting section and the receiving section, there is no need to form a new positioning hole. Moreover, the size of the first pedestal and the second pedestal is not increased only for positioning. In addition, since the first positioning member and the second positioning member use positioning means for positioning the transmitting portion and the receiving portion, the positioning of the first pedestal and the second pedestal becomes more accurate.

  (5) In the configuration of (4) above, the member positioning step includes a step of fixing the second pedestal. The sensor mounting method of the present invention includes a pedestal fixing step and an mounting step. In the pedestal mounting step, the first pedestal to be implemented after the pedestal positioning step is fixed using the position adjusting means. In the mounting step, the first positioning member and the second positioning member are removed, and the transmitter and the receiver are positioned and fixed at the first predetermined position and the second predetermined position via the first positioning means and the second positioning means. .

  In this configuration, the second positioning member is positioned, and the second pedestal is also fixed. Thereafter, in the pedestal positioning step, the first positioning member is positioned, and the first positioning member and the second positioning member are fitted in a predetermined direction. Next, the first pedestal is fixed while the position is adjusted so as to maintain the fitted state of the first positioning member and the second positioning member. Thereafter, the transmitter and the receiver are attached to the first pedestal and the second pedestal.

  Therefore, since only one of the first pedestal and the second pedestal is fixed while being adjusted, it is not necessary to adjust the positions of the two pedestals, and the adjustment is not complicated.

  (6) In the configuration of (5) above, in the pedestal fixing step, the first pedestal positioned above the second pedestal is fixed using the position adjusting means.

  In this configuration, since the first pedestal is located above the second pedestal, it is easy to adjust the position of the first pedestal in the pedestal fixing step.

  According to the present invention, the following effects can be obtained.

  (1) By positioning the first positioning member and the second positioning member in a state of being positioned at the first predetermined position and the second predetermined position, positioning is performed while ensuring the positional accuracy of the transmitting unit and the receiving unit. Therefore, it is possible to reduce the space necessary only for the purpose.

  (2) By fitting the first positioning member to the lower second positioning member, the operator can easily fit the first positioning member and the second positioning member, and the workability of mounting the base can be improved. it can.

  (3) By providing the index indicating the protrusion amount at the penetrating portion of the second positioning member, the distance between the first pedestal and the second pedestal can be visually observed.

  (4) By positioning and fitting the first positioning member and the second positioning member at the first predetermined position and the second predetermined position, positioning accuracy is ensured while ensuring the positional accuracy of the transmission unit and the reception unit. Therefore, it is possible to reduce the space required only for the operation.

  (5) By fixing only the first pedestal while adjusting, there is no need to adjust while adjusting the positions of the two pedestals, and the workability of mounting the pedestal can be improved.

  (6) By positioning the first pedestal above the second pedestal, the work of adjusting the position of the first pedestal can be easily performed in the pedestal fixing step, and the workability of attaching the pedestal can be improved.

  Hereinafter, a pedestal position adjusting jig and a sensor mounting method according to the best embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a schematic configuration of an image forming apparatus having a pedestal positioned by a pedestal adjusting jig according to an embodiment of the present invention. The image forming apparatus 100 forms a monochrome image on a predetermined recording sheet (sheet) in accordance with image data obtained by scanning a document or image data transmitted from the outside.

  The image forming apparatus 100 includes an ADF (Auto Document Feeder) 1, an image reading unit 2, an optical writing unit 3, a developing device 4, a photoconductor 5, a charger 6, a cleaner unit 7, a transfer belt 8, a fixing unit 9, a supply unit It is composed of a paper unit 400 and the like.

  The ADF 1 includes a document tray 27, a document transport path S1, a paper discharge tray 36, and the like, and transports a document from which image data is to be read to a document reading position A. The document tray 27 places a bundle of documents. The document transport path S1 transports a document placed on the document tray 27 to the paper discharge tray 36 via the document reading position A. Details will be described later.

  The image reading unit 2 includes a light source holder 13, a mirror group 14, a CCD 15, and the like. When scanning the reading surface of the document conveyed from the document tray 27 to the document reading position A, the light source holder 13 and the mirror group 14 are stationary.

  The light source holder 13 irradiates light on the reading surface of the document conveyed from the document tray 27 to the document reading position A. The light reflected by the reading surface is optically path-converted through the mirror group 14, imaged on the CCD 15, and converted into electronic image data.

  The charger 6 uniformly charges the surface of the photoconductor 5 to a predetermined potential. In the image forming apparatus 100 of the present embodiment, the charger type charger 6 is used, but a contact type roller type or brush type charger can also be used.

  The optical writing unit 3 adopts a two-beam system including two laser irradiation units 16a and 16b to cope with high-speed printing processing, and exposes the surface of the photoconductor 5 based on input image data. To form an electrostatic latent image. The laser irradiation units 16a and 16b irradiate laser light based on the image data. The mirror groups 17a and 17b reflect the irradiated laser light and guide it to the surface of the uniformly charged photoreceptor 5.

The developing device 4 is disposed in the vicinity of the surface of the photoreceptor 4 and visualizes the electrostatic latent image formed on the surface of the photoreceptor 5 with toner. The transfer belt 8 is stretched in a loop between a plurality of rollers below the photoreceptor 5, and has a resistance value of about 1 × 10 ⁹ to 1 × 10 ¹³ Ω · cm. Inside the loop-shaped movement path of the transfer belt 8, a transfer roller 22 that presses against the photoconductor 5 with the transfer belt 8 interposed therebetween is provided. A predetermined transfer voltage is applied to the transfer roller 22, and a toner image carried by the photoconductor 5 is transferred onto a recording sheet that passes through a transfer position between the transfer belt 8 and the photoconductor 5.

  The cleaner unit 7 removes and collects toner remaining on the surface of the photoreceptor 5 after the toner image is transferred to the recording paper.

  The fixing device 9 includes a heating roller 23 and a pressure roller 24. The heating roller 23 is heated to a temperature at which the toner can be melted by an internal heater. The pressure roller 24 is pressed against the peripheral surface of the heating roller 23 with a predetermined pressure. The fixing device 9 firmly fixes the toner image on the paper by heating and pressurizing the recording paper passing between the heating roller 23 and the pressure roller 24. The sheet that has passed through the fixing device 9 is discharged to a discharge tray 12 mounted on one side surface of the image forming apparatus 100.

  The paper feed unit 400 includes paper feed cassettes 401, 402, 403, 404, a manual feed tray 405, and the like. Each of the paper feed cassettes 401, 402, 403, 404 stores a plurality of sheets of the same size. On the manual feed tray 405, paper of a size or quality that is not frequently used is placed.

  The paper feed unit 400 feeds paper one by one from one of the paper feed cassettes 401, 402, 403, 404 and the manual feed tray 405. The sheet fed from the sheet feeding unit 400 is conveyed to the transfer position between the photosensitive member 5 and the transfer belt 8 via the sheet feeding conveyance path 10 and the sheet conveyance path 11. Thereafter, the toner image is transferred and fixed on the sheet as described above, and is discharged to the discharge tray 12.

  FIG. 2 is a cross-sectional view showing a schematic configuration of an ADF having a pedestal positioned by a pedestal adjusting jig according to an embodiment of the present invention.

  The ADF 1 includes a document tray 27, a pickup roller 28, a paper feed roller 30 and a separating roller 29, a driving roller 32 and a pressing roller 31, a registration roller 33, a paper discharge roller 35, and a paper discharge tray 36.

  The pickup roller 28 sends out the uppermost document in the document bundle placed on the document tray 27 to the document conveyance path 213. The paper feed roller 30 and the separating roller 29 convey the documents sent to the document conveyance path 213 to the downstream side of the document conveyance path 213 while separating the documents one by one.

  The driving roller 32 and the pressing roller 31 convey the document along the document conveyance path 213. The pressing roller 31 is a driven roller that presses the document against the driving roller 32. The registration roller 33 is disposed on the downstream side of the driving roller 32 and the pressing roller 31 in the direction of the arrow F1 that is the document conveyance direction. The registration roller 33 sends out the document so that the document passes through the document reading position A on the document table 34 at a predetermined timing. The rotation axis of the registration roller 33 is arranged in a direction orthogonal to the arrow F1 direction. The paper discharge roller 35 discharges the document whose image has been read to the paper discharge tray 36.

  The document tray 27 can move in the vertical direction, and when a bundle of documents is placed, a sensor (not shown) detects it. When a printing request is made by the user, the document tray 27 moves upward so that the recording paper comes into contact with the pickup roller 28.

  The document is conveyed by the driving roller 32 and the pressing roller 31, and the front end is abutted against the resist roller 33 in a stopped state. Thereby, when the document is skewed, the skew of the document is corrected. As described above, the registration roller 33 starts rotating at a timing when the document is sent onto the document table 34 at a predetermined timing.

  In addition, the ADF 1 includes a double feed detection sensor 37 in the vicinity of the driving roller 32 and the pressing roller 31 disposed on the downstream side in the direction of the arrow F 1 with respect to the paper feeding roller 30 and the separating roller 29. The double feed detection sensor 37 is an ultrasonic sensor, and includes a transmitter 38 and a receiver 39 as shown in FIG. 3, and the original D is conveyed when the original D overlaps and is conveyed to the original conveyance path S1. Detects double feed. The wave transmitter 38 corresponds to the transmitting unit of the present invention, and the wave receiver 39 corresponds to the receiving unit of the present invention.

  The double feed detection sensor 37 is usually provided even when the original D is overlapped and sent to the original transport path S1, but the double feed state is canceled by the separation roller 29, but the high speed printing process is performed. This is because the document D is conveyed at a high speed so as to correspond to the above, and there is a possibility that double feeding may occur even if the separation roller 29 is provided.

  The ultrasonic sensor is hardly affected by the thickness, color, etc. of the recording paper as compared with the optical sensor and has few false detections.

  As shown in FIG. 6, the wave transmitter 38 faces the wave receiver 39 across the document conveyance path S <b> 1 so as to be inclined with respect to the arrow F <b> 2 direction which is a direction orthogonal to the arrow F <b> 1 direction. The transmitter 38 outputs an ultrasonic wave in one direction toward the receiver 39. 6 is an enlarged cross-sectional view showing a mounting state of the first pedestal 41, the second pedestal 42, and the double feed detection sensor 37 as seen from the direction of the arrow Y shown in FIG.

  The wave receiver 39 is located on the output direction of the ultrasonic wave output from the wave transmitter 38, receives the ultrasonic wave, and converts it into electrical energy. As in the present embodiment, the arrangement positions of the transmitter 38 and the receiver 39 are inclined with respect to the direction of the arrow F2, so that the output direction of the ultrasonic waves is not orthogonal to the surface direction of the document D. It is for doing so. In other words, when the output direction of the ultrasonic wave is orthogonal to the surface direction of the document D, the ultrasonic wave reflected from the document D is reflected on the upper surface of the document transport path S1 and reaches the wave receiver 39, and erroneous detection occurs. Because it will do.

  As shown in FIG. 3, the drive roller 32 and the pressing roller 31 carry out the conveyed document D at a predetermined carry-out angle so as to press the document D down the document conveyance path S1. For this reason, the drive roller 32 is disposed downstream of the pressing roller 31 in the direction of the arrow F1.

  The double feed detection sensor 37 is an area in which the document D is conveyed along the document conveyance path S1 while being in contact with the bottom surface of the document conveyance path S1, specifically, the document D unloaded from the driving roller 32 and the pressing roller 31. Double feed of the document D is detected in the vicinity of a contact point C between the leading edge and the bottom surface of the document transport path S1.

  The ultrasonic wave transmitted from the transmitter 38 is attenuated when passing through the document D. Here, when one document D passes between the transmitter 38 and the receiver 39, and when the two documents Da and Db overlap each other as shown in FIG. As shown in FIG. 5, the attenuation amount of the ultrasonic wave received by the receiver 39 is different from the case of passing between the receiver 39 and the receiver 39. This is because the ultrasonic wave transmitted from the transmitter 38 is greatly attenuated by a slight air layer in which the originals Da and Db overlap each other.

  A control unit (not shown) provided in the image forming apparatus 100 compares the level of the electric energy converted by the receiver 39 shown in FIG. 5 with a predetermined threshold value, so that the document D is normally processed. It is determined whether the sheets are being conveyed one by one or in a double feed state. The control unit controls the operation of the entire image forming apparatus. FIG. 5 is an explanatory diagram showing the relationship between the number of documents to be fed and the electrical energy of ultrasonic waves received by the wave receiver 39.

  As shown in FIG. 6, the wave transmitter 38 is fixed with screws 61 in a state of being fitted into the opening 41 </ b> A of the first base 41. Further, the wave receiver 39 is fixed with screws 62 in a state of being fitted into the opening 42A of the second pedestal 42 as shown in FIG. The transmitter 38 and the receiver 39 are positioned by the opening 41A and the opening 42A. The positions of the transmitter 38 and the receiver 39 positioned by the opening 41A and the opening 42A correspond to the first predetermined position and the second predetermined position of the present invention.

  The first pedestal 41 is fixed to the upper surface of the outer wall of the document transport path S1 with two screws 65 and 66. The through holes 75 and 76 of the first pedestal 41 that pass through the screwed portions of the screws 65 and 66 are long holes in which grooves are formed along the direction of the arrow F2. Therefore, it is possible to adjust the position of the first pedestal along the arrow F2 direction. The screws 65 and 66 and the through holes 75 and 76 correspond to the position adjusting means of the present invention.

  The second pedestal 42 is fixed to the bottom surface of the outer wall of the document transport path S1 with two screws 67 and 68. The through holes 77 and 78 of the second pedestal 42 that pass through the screwed portions of the screws 67 and 68 have a diameter that allows the screwed portions to pass therethrough. Therefore, the position of the second pedestal 42 cannot be adjusted along the arrow F2 direction, and the second pedestal 42 is fixed at one point by screws 67 and 68.

  FIG. 7 is an explanatory view showing the procedure of a sensor mounting method for mounting the first pedestal 41, the second pedestal 42 and the double feed detection sensor 37 using the pedestal position adjusting jig according to the embodiment of the present invention. When attaching the double feed detection sensor 37 in a production process or the like, the operator first fixes the second pedestal 42 using screws 67 and 68 and opens the second positioning member 82 in the opening 42A as shown in FIG. Through the document transport path S1 (member mounting step).

  As for the 2nd positioning member 82, the shape of fitting part 82A fitted to opening 42A is the same shape as wave receiver 39, and cylindrical extension part 82B has extended from fitting part 82A. In the extending portion 82B, the shaft extends in the output direction of the ultrasonic wave output from the transmitter 38 in a state where the second positioning member 82 is inserted into the opening 42A. The second positioning member 82 is positioned by the opening 42A. Further, the fitting portion 82A is formed with a protruding portion 82C that fits into a screwing hole into which the screw 62 is screwed. The second positioning member 82 is fixed to the second pedestal 42 by fitting the protruding portion 82C into the screw hole.

  Note that the attachment of the second pedestal 42 and the attachment of the second positioning member 82 may be either first or simultaneously.

  Next, the first pedestal 41 is temporarily fixed with screws 65 and 66. Thereafter, as shown in FIG. 7B, the first positioning member 81 is inserted into the opening 41A toward the inside of the document conveyance path S1. At this time, the through-hole 81C formed in the first positioning member 81 is externally fitted to the extending portion 82B of the second positioning member (pedestal positioning step). At this time, the through hole 81C is externally fitted to the extending portion 82B in the output direction of the ultrasonic wave output from the wave transmitter 38. Thereby, the one end side of the extension part 82B penetrates. The first pedestal 41 may not be temporarily fixed. The output direction of the ultrasonic wave corresponds to the predetermined direction of the present invention.

  In the first positioning member 81, the shape of the fitting portion 81A fitted to the opening 41A is the same as that of the wave receiver 38, and a cylindrical extending portion 81B extends from the fitting portion 81A. The first positioning member 81 is positioned by the opening 41A. Further, the first positioning member 81 is fixed by being externally fitted to the second positioning member 82.

  As described above, the positions of the first pedestal 41 and the second pedestal 42 are determined in a state where the first positioning member 81 and the second positioning member 82 are fitted in the output direction of the ultrasonic wave. Thereafter, in this state, the first pedestal 41 is moved and adjusted along the direction of the arrow F2 and fixed using the screws 65 and 66 (pedestal fixing step). In addition, the 1st positioning member 81 and the 2nd positioning member 82 comprise the base position adjustment jig of this invention.

  Next, the first positioning member 81 and the second positioning member 82 are removed, and instead the transmitter 38 and the receiver 39 are attached as shown in FIG. 6 (attachment step). Thereby, the positional accuracy of the transmitter 38 and the receiver 39 attached by removing the first positioning member 81 and the second positioning member 82 can be ensured.

  Further, the first positioning member 81 and the second positioning member 82 are positioned using the opening 41A as the first positioning means for positioning the transmitter 38 and the receiver 39 and the opening 42A as the second positioning means. Therefore, it is not necessary to form a new positioning hole, and it is possible to prevent the first pedestal 41 and the second pedestal 42 from increasing in size only for positioning. Therefore, it is possible to reduce the space required only for positioning while ensuring the positional accuracy of the transmitter 38 and the receiver 39 (the first pedestal 81 and the second pedestal 82).

  In the present embodiment, the first positioning member 81 is provided with a through hole 81C, and the first positioning member 81 is externally fitted to the second positioning member 82 from above, so that the operator looks into the through hole 81C from above. The external fitting operation can be performed while visually recognizing the position of the second positioning member 82. Therefore, the first positioning member 81 can be easily fitted on the second positioning member 82 from above, and the workability of attaching the first base 41 and the second base 42 can be improved.

  In the present embodiment, a plurality of grooves 82D are formed on one end side of the extending portion 82B of the second positioning member 82 by providing a partition wall. The groove 82D has a groove direction parallel to a direction orthogonal to the extending direction of the extending part 82B, and is used as an index representing the protruding amount of the extending part 82B. By this index, the operator can visually check the distance between the first pedestal 41 and the second pedestal 42 in a state where the first positioning member 81 and the second positioning member 82 are fitted. One end side of the fitting portion 81A corresponds to the penetrating portion of the present invention. In addition, the index is not limited to the groove 82D, and any index can be used as long as the distance between the first pedestal 41 and the second pedestal 42 such as a scale can be visually observed.

  In addition, the structure which does not protrude the 1st positioning member 81 at the one end side of the extension part 82B may be sufficient. For example, as shown in FIG. 8, a first positioning member 81 having a fitting hole 91 and a peep hole 92 may be used. The fitting hole 91 is externally fitted to the extending portion 82B. The peep hole 92 communicates with the fitting hole 91 on one end side, and the other end side is exposed to the outside on the fitting portion 81A side.

  Therefore, the operator can perform work while confirming the position of the extending portion 82B from the peep hole 92. Moreover, since the peeping hole 92 is smaller than the diameter of the extension part 82B, it has a function of a stopper that restricts the extension part 82B from being fitted into the fitting hole 91 too much. Therefore, the distance between the first pedestal 41 and the second pedestal 42 can always be kept constant. Moreover, as shown in FIG. 9, the structure without the peep hole 92 may be sufficient.

  In this embodiment, since only the first pedestal 41 can be adjusted in position along the direction of the arrow F2, there is no need to adjust the positions of the two pedestals while adjusting the pedestal. Can be improved. In addition, since the first pedestal 41 that can be adjusted in position is disposed above the second pedestal 42, it is easy for the operator to adjust the position of the first pedestal 41, and the workability of mounting the pedestal is improved. Can be made.

  In this embodiment, the wave transmitter 38 is fixed to the first pedestal 41 and the wave receiver 39 is fixed to the second pedestal 42, but the reverse may be possible. Further, the direction of position adjustment of the first pedestal 41 is the arrow F2 direction, but it is not particularly limited to this, and the direction in which the output direction of the ultrasonic wave is inclined with respect to the surface direction of the document being conveyed. If it is.

  Further, in the present embodiment, as shown in FIG. 1, a double feed detection sensor 37 having the same configuration as the double feed detection sensor 37 is arranged on the paper conveyance path 11 on the original conveyance path S1, and the paper on which an image is formed. Prevents double feed.

  Finally, in the present embodiment, the ultrasonic sensor that is the double feed detection sensor 37 has been described. However, the ultrasonic sensor is not particularly limited to this, and a transmitter that outputs a signal in a predetermined direction in space and a transmitter Any sensor can be used as long as it is a receiving unit that receives an output signal and has a receiving unit that is spaced from the transmitting unit and faces in a predetermined direction. For example, there is an optical sensor having a light emitting unit and a light receiving unit. Furthermore, in this embodiment, the image forming apparatus has been described. However, any apparatus including the above-described sensor is applicable. For example, there is a paper feeding device that conveys a recording paper to a predetermined position.

1 is a cross-sectional view showing a schematic configuration of an image forming apparatus having a pedestal positioned by a pedestal adjusting jig according to an embodiment of the present invention. It is sectional drawing which shows the schematic structure of ADF which has the base positioned by the base adjustment jig. It is sectional drawing to which a part of ADF which has a base positioned by the base adjustment jig was expanded. It is sectional drawing to which a part of ADF which has a base positioned by the base adjustment jig was expanded. It is explanatory drawing which shows the relationship between the double feed number of a document, and the electrical energy of the ultrasonic wave which the receiver received. It is an expanded sectional view which shows the attachment state of the base and double feed detection sensor seen from the arrow Y direction of FIG. It is explanatory drawing which shows the procedure of the sensor attachment method which attaches a 1st base, a 2nd base, and a double feed detection sensor using the base position adjustment jig. It is explanatory drawing explaining the structure of the base position adjustment jig which concerns on another embodiment of this invention. It is explanatory drawing explaining the structure of the base position adjustment jig which concerns on another embodiment of this invention.

Explanation of symbols

37-Double feed detection sensor 38-Transmitter 39-Receiver 41-First base 41A-Opening 42-Second base 42A-Opening 65, 66, 67, 68- Screw 75, 76, 77, 78- Through Hole 81-first positioning member 81C-through hole 82-second positioning member 82D-groove

Claims (6)

One of a transmitting unit that outputs a signal in a predetermined direction of space or a receiving unit that receives a signal output by the transmitting unit and that is spaced from the transmitting unit and faces the predetermined direction is a first unit. A first positioning member positioned at the first predetermined position via the first positioning means with respect to a first base having a first predetermined position positioned via the one positioning means;
One of the receiving unit or the transmitting unit is positioned at the second predetermined position via the second positioning unit with respect to a second pedestal having a second predetermined position positioned via the second positioning unit. A second positioning member,
The pedestal position adjusting jig, wherein the first positioning member and the second positioning member are fitted in the predetermined direction while being positioned on the first pedestal and the second pedestal.   The pedestal position adjusting jig according to claim 1, wherein the first positioning member has a through hole and is fitted on the second positioning member positioned below.   The pedestal position adjusting jig according to claim 2, wherein the second positioning member includes a penetrating portion that penetrates the first positioning member, and an index indicating a protruding amount is provided in the penetrating portion. One of a transmitting unit that outputs a signal in a predetermined direction of space or a receiving unit that receives a signal output by the transmitting unit and that is spaced from the transmitting unit and faces the predetermined direction is a first unit. A member positioning step for positioning the second positioning member at the second predetermined position via the second positioning means with respect to the second base having the second predetermined position positioned via the two positioning means;
With respect to a first pedestal in which one of the receiving unit or the transmitting unit is positioned at a first predetermined position via the first positioning means, a first positioning member is connected to the first predetermined position via the first positioning means. And a pedestal positioning step of positioning the first positioning member and the second positioning member in the predetermined direction. The member positioning step includes a step of fixing the second pedestal,
A pedestal fixing step of fixing the first pedestal performed after the pedestal positioning step using a position adjusting means;
The first positioning member and the second positioning member are removed, and the transmitting section and the receiving section are moved to the first predetermined position and the second predetermined position via the first positioning means and the second positioning means. The sensor mounting method according to claim 4, further comprising a mounting step of positioning and fixing.   6. The sensor mounting method according to claim 5, wherein, in the pedestal fixing step, the first pedestal positioned above the second pedestal is fixed using a position adjusting means.

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