JP5365270B2 - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect a nonfeeding state and a double feeding state of paper, when detecting the passing of the paper by a sensor thereafter, by further carrying on a paper feeding roller, by separately carrying the paper on a pickup roller, in an image forming device. <P>SOLUTION: A paper feeding motor 8 rotates. A first transmission gear 5 rotating by being transmitted to a first transmission belt 11, a second transmission gear 6 rotating by the first transmission gear 5, a third transmission gear 7 rotating by the second transmission gear 6 and a shaft 1-1 further integrated with the third transmission gear 7 and the pickup roller 1, rotate synchronously with the rotation of the third transmission gear 7. The paper 10 is carried through the rotation of the pickup roller 1. A thickness direction state of the paper 10 is detected by the sensor 3 integrated with a light receiving element and a light emitting element arranged in the oblique direction in a state capable of rotating the carried paper 10 to the same shaft part and a shaft for rotating the paper feeding roller 2. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a paper transport device in an image forming apparatus such as a printer, a facsimile machine, and a copier, and more particularly to a technique for detecting a paper transport state.

  Conventionally, as a technique related to an image forming apparatus, for example, Japanese Patent Application Laid-Open No. 2004-269199 (Patent Document 1), Japanese Patent Application Laid-Open No. 11-255531 (Patent Document 2), Japanese Patent Application Laid-Open No. 10-279133 (Patent Document 3), There are some which were disclosed by Unexamined-Japanese-Patent No. 10-198093 (patent document 4) and Japanese Utility Model Laid-Open No. 4-49139 (patent document 5).

  The technology of Patent Document 1 is a mass feeding device with an intermediate conveyance unit, and the use of a conventional sensor with an actuator results in low durability and reliability, lack of maintainability, The problem is to solve the problem of erroneous detection at the time of double-sided printing, or the problem of erroneous detection due to the influence of ambient light, because paper dust is likely to adhere. Then, at least one of the leading end and the trailing end of the sheet P which is arranged and transported on the upper guide plate at a predetermined interval from the upstream side to the downstream side of the intermediate transport path to detect a plurality of types of paper sizes. A first sensor serving as a paper detection means for detecting the above.

  The technique of Patent Document 2 is a paper positioning mechanism and a paper positioning method for an optical reader, and has a problem of performing positioning without causing a paper transport error with a simple configuration. The leading edge of the paper fed by the paper feed roller passes through the paper feed path between the paper guides and hits the nip portion between the drive roller and the pressure roller. Further, even after the leading edge of the paper hits the nip portion, the paper feeding roller is further driven so that the middle of the paper bends along a substantially L-shaped groove provided in the paper guide, thereby the leading edge of the paper. The warp and curl of the paper are corrected, the stiffness of the paper becomes strong and the biting is improved, so that the conveyance error is prevented and the skew is corrected.

  The technology of Patent Document 3 is a paper transport device, and provides a paper transport device that is highly accurate in detecting the leading edge of paper, suppresses transport troubles, and is easy to assemble even for stiff paper such as cardboard. The challenge is to do. For this reason, the registration detection device is disposed on the downstream side of the sheet conveyance with respect to the registration roller, and the registration roller is configured to be driven in a forward / reverse direction. Then, the front end of the paper transported through the paper transport path is passed through the registration roller from the registration roller to the image forming unit by normal rotation operation, and after the front end is detected by the registration detection device, the registration roller nip operation is performed by the reverse rotation operation of the registration roller. It is controlled to return the tip to the part.

  The technique of Patent Document 4 is a recording medium identification device, and it is an object to identify various types of recording media stably. And each reflected light amount data received by the regular reflection light receiving element that receives the different reflected light components that are emitted from the light emitting element that emits light to the fed recording medium and reflected on the recording medium, and each reflected light amount data received by the irregular reflection light receiving element Are compared with a plurality of threshold values stored in advance, and the main CPU determines the type of the recording medium to be fed.

  The technique of Patent Document 5 is a paper remaining amount detection device that emits light having a spot diameter smaller than the thickness of a single sheet while moving in a direction crossing the side surface of the paper on the paper feed cassette. Means, light receiving means for receiving reflected light from the side of the paper on the paper feed cassette irradiated by the light emitting means and converting it into an electrical signal, and a paper feed cassette from the electrical signal converted by the light receiving means And detecting means for detecting a gap between the end face of each sheet and the sheet, and counting means for counting the end face of each sheet from the detection signal detected by the detecting means.

Problems to be solved by the inventions of claims 1 to 10 are as follows. When the paper is separated and conveyed by the pick-up roller and further conveyed by the paper feed roller, and then the sensor detects that the paper has passed, the double feed status of the paper is detected because it is detected from directly above the front edge of the paper. There was a fault that could not be detected. In addition, when detecting double feeding using an ultrasonic sensor, there is a drawback in that the output varies depending on the thickness of the paper and is erroneously detected.

Further, the problems to be solved by the invention of claim 7 are as follows. In order to prevent double feeding, the reverse roller had to be brought into contact with the paper feed roller for each sheet.

Further, the problems to be solved by the inventions of claims 8 to 10 are as follows. The timing to detect non-feed is that the paper is separated and conveyed by the pickup roller, further conveyed by the paper feed roller, and then the time when the paper passes by the sensor is detected. There was a drawback that it was not possible to detect the case of feeding.

The image forming apparatus according to claim 1, in which the light receiving element and the sensor integrated with the light emitting element are disposed in an oblique direction on the same shaft portion as the shaft that rotates the paper feed roller, and is conveyed in an oblique direction. An image forming apparatus for detecting an end surface , wherein a sensor integrated with the light receiving element and the light emitting element is moved forward, backward, or reciprocally in a circumferential direction of the same shaft as a shaft that rotates the paper feed roller. It is characterized by.

The image forming apparatus according to claim 2 is the image forming apparatus according to claim 1 , wherein the sensor integrated with the light receiving element and the light emitting element is arranged in a circumferential direction of the same shaft portion as an axis for rotating the sheet feeding roller. A solenoid is provided in a mechanism that moves forward, backward, or reciprocally.

The image forming apparatus according to claim 3 is the image forming apparatus according to claim 1 , wherein the sensor integrated with the light receiving element and the light emitting element is arranged in the circumferential direction of the same shaft portion as the shaft for rotating the paper feed roller. An actuator is provided in a mechanism that moves forward, backward, or reciprocally.

The image forming apparatus according to claim 4, in the image forming apparatus according to any one of claims 1 to 3, a sensor integrated with the light-receiving element and the light-emitting element detects the leading edge condition of the conveyance object The digital signal output from the light receiving unit is measured.

The image forming apparatus according to claim 5 is the image forming apparatus according to claim 4 , wherein the sensor integrated with the light receiving element and the light emitting element detects the state of the tip of the conveyed object and is output from the light receiving part. The number of pulses detected in the thickness direction of the conveyed product is measured with a digital signal.

An image forming apparatus according to a sixth aspect is the image forming apparatus according to the fifth aspect , wherein abnormal processing is performed when the number of pulses does not coincide with a preset number.

The image forming apparatus according to claim 7 is the image forming apparatus according to claim 6 , wherein when the number of pulses is larger than a preset number, the reverse roller is abutted against the sheet feeding roller. .

An image forming apparatus according to an eighth aspect is the image forming apparatus according to the sixth aspect , wherein when the number of pulses is smaller than a preset number, the pickup roller is abutted from the conveyed object and conveyed again. It is characterized by striking against an object.

The image forming apparatus according to claim 9 is the image forming apparatus according to claim 6 , wherein when the number of pulses is smaller than a preset number, the pickup roller is rotated in the reverse direction and is rotated in the normal direction again. And

An image forming apparatus according to a tenth aspect is the image forming apparatus according to the sixth aspect , wherein when the number of pulses is smaller than a preset number, the current of the driving motor that rotates the pickup roller is increased. It is characterized by making it.

  According to the first aspect of the present invention, paper is conveyed by disposing the light receiving element and the sensor integrated with the light emitting element in an oblique direction on the same shaft portion as the shaft for rotating the paper feed roller in a rotatable state. It is possible to obtain an image forming apparatus in which the state in the thickness direction is detected.

In addition, the state in the thickness direction of paper conveyance is detected by moving the light receiving element and the sensor integrated with the light emitting element back and forth or reciprocate in the circumferential direction of the same shaft as the shaft that rotates the paper feed roller. An image forming apparatus can be obtained.

According to the second aspect of the present invention, in addition to the effect of the first aspect , the sensor integrated with the light receiving element and the light emitting element is moved forward or backward in the circumferential direction of the same shaft portion as the shaft that rotates the paper feed roller. Alternatively, by providing a solenoid in the reciprocating mechanism, it is possible to obtain an image forming apparatus in which the state of the sheet conveyance in the thickness direction is detected.

According to the third aspect of the present invention, in addition to the effect of the first aspect , the sensor integrated with the light receiving element and the light emitting element is moved forward or backward in the circumferential direction of the same shaft portion as the shaft that rotates the paper feed roller. Alternatively, by providing an actuator in the reciprocating mechanism, it is possible to obtain an image forming apparatus in which the state of the sheet conveyance in the thickness direction is detected.

According to the invention of claim 4 , in addition to the effect of any one of claims 1 to 3 , the sensor integrated with the light receiving element and the light emitting element detects the state of the tip of the conveyed object, and from the light receiving part. By measuring the output digital signal, it is possible to obtain an image forming apparatus in which the state of the sheet conveyance in the thickness direction is detected.

According to the invention of claim 5 , in addition to the effect of claim 4 , the sensor integrated with the light receiving element and the light emitting element detects the tip end state of the conveyed object, and is a digital signal output from the light receiving part, By measuring the number of pulses detected in the thickness direction of the conveyed product, an image forming apparatus in which the state in the thickness direction of the paper conveyance is detected can be obtained.

According to the invention of claim 6 , in addition to the effect of claim 5 , when the number of pulses does not coincide with a preset number, an abnormal process is performed to obtain an image forming apparatus that improves the sheet conveyance accuracy. be able to.

According to the invention of claim 7 , in addition to the effect of claim 6 , only when the number of pulses is larger than a preset number, the reverse roller is brought into contact with the paper feed roller to thereby perform double feeding at the time of paper conveyance. Thus, an image forming apparatus that separates the conveyed product can be obtained.

According to the eighth aspect of the present invention, in addition to the effect of the sixth aspect , when the number of pulses is smaller than a preset number, the pickup roller is released from abutting against the conveyed object and is again abutted against the conveyed object. Thus, an image forming apparatus that prevents non-feeding can be obtained.

According to the ninth aspect of the present invention, in addition to the effect of the sixth aspect , when the number of pulses is smaller than a preset number, the pickup roller is reversely rotated, and the non-feed is prevented by rotating the pickup roller forward again. An image forming apparatus can be obtained.

According to the invention of claim 10 , in addition to the effect of claim 6 , when the number of pulses is smaller than a preset number, the current of the drive motor rotating the pickup roller is increased by increasing the current. An image forming apparatus that prevents feeding can be obtained.

FIG. 3 is a schematic top view of the periphery of the sheet feeding device and the pickup roller in the first embodiment of the present invention. It is a side surface schematic diagram of the circumference of a paper feeder and a pickup roller in a 1st embodiment of the present invention. It is a figure which shows a mode that the thickness and front-end | tip part state of a sheet | seat are detected by the sensor in embodiment of this invention. It is the upper surface schematic diagram of the circumference | surroundings of the paper feeder and pick-up roller in 2nd Embodiment of this invention. It is a side surface schematic diagram of the circumference | surroundings of the paper feeder and pick-up roller in 2nd Embodiment of this invention. FIG. 10 is a schematic top view of the periphery of a sheet feeding device and a pickup roller according to a third embodiment of the present invention. It is a side surface schematic diagram of the circumference | surroundings of the paper feeder and pick-up roller in 3rd Embodiment of this invention. It is a top schematic diagram of the circumference of a paper feeder and a pickup roller in a 4th embodiment of the present invention. It is a side surface schematic diagram of the circumference | surroundings of the paper feeder and pick-up roller in 4th Embodiment of this invention. FIG. 10 is a schematic top view of a periphery of a sheet feeding device and a pickup roller according to a fifth embodiment of the present invention. It is a side surface outline enlarged view of the circumference of a paper feeder and a pickup roller in a 5th embodiment of the present invention. It is a side assembly outline figure of the part of the worm gear in a 5th embodiment of the present invention. It is a side assembly outline figure of a portion of a sensor in a 5th embodiment of the present invention. It is a side assembly schematic diagram which shows the assembled state of the sensor fixing member and sigma-shaped member of the sensor part in 5th Embodiment of this invention. It is a block diagram of the whole control part in a 6th embodiment of the present invention. It is a timing chart in a 6th embodiment of the present invention. It is a block diagram of the whole control part in a 7th embodiment of the present invention. It is a timing chart in a 7th embodiment of the present invention. It is a block diagram of the whole control part in an 8th embodiment of the present invention. It is a timing chart at the time of the double feed state detection in 8th Embodiment of this invention. It is a timing chart at the time of the non-feed state detection in 8th Embodiment of this invention. It is a block diagram of the whole control part in 9th Embodiment of this invention. It is a flowchart in 9th Embodiment and 10th Embodiment of this invention. It is a block diagram of the whole control part in a 10th embodiment of the present invention. It is a flowchart in 11th Embodiment of this invention. It is a flowchart in 12th Embodiment of this invention. It is a flowchart in 13th Embodiment of this invention. It is a flowchart in 14th Embodiment of this invention. It is a whole block diagram of 15th thru | or 18th embodiment of this invention. It is a flowchart in 15th Embodiment of this invention. It is a flowchart in 16th Embodiment of this invention. It is a flowchart in 17th Embodiment of this invention. It is a flowchart in 18th Embodiment of this invention. 1 is a schematic diagram of an image forming apparatus according to an embodiment of the present invention.

  Next, an embodiment of the image forming apparatus of the present invention will be described with reference to the drawings. FIG. 34 is a schematic diagram of an image forming apparatus according to an embodiment of the present invention.

  In FIG. 34, reference numeral 100 denotes the image forming apparatus according to the embodiment. The image forming apparatus 100 includes a plurality of sheet feeding devices 21, an automatic document feeder 110, a reading unit 120, a writing unit 130, and an image forming unit according to the embodiment. 140, a paper feed unit 150, and a post-processing unit 160.

  The automatic document feeder 110 feeds the document M on the document placing plate 112 onto the contact glass 121 of the reading unit 120 by the belt feeding device 111 and also contacts the document M on which the reflection image is read by the image reading unit 120 with the contact glass. 121 is discharged from above. The reading unit 120 illuminates the original M on the contact glass 121 and reads (photoelectrically converts) the original M on the contact glass 121, converts the optical signal into an electric signal, and outputs it to an image processing unit (not shown).

  Each sheet feeding device 21 accommodates a plurality of sheets 10, and the sheet 10 is fed from the designated one sheet feeding device 21 to the sheet feeding unit 150 by the pickup roller 1. The paper feed unit 150 sends the paper 10 between the registration rollers 151 on the image forming unit 140 side. Then, the paper 10 is sent out toward the image forming unit 140 via the registration roller 151.

  The writing unit 130 receives the laser beam emitted from the laser output unit 131 in accordance with an image signal from an image processing unit (not shown) via an optical system such as a polygon mirror, and the outer peripheral surface of the photosensitive drum 141 of the image forming unit 140. A focused image is formed on the photosensitive drum 141 and exposed to the photosensitive drum 141. As a result, the writing unit 130 forms an electrostatic latent image on the outer peripheral surface of the photosensitive drum 141. In the image forming unit 140, the developing device 142 causes the toner to adhere to the outer peripheral surface of the photosensitive drum 141 to develop the electrostatic latent image, and the toner on the photosensitive drum 141 is applied to the sheet 10 sent from the registration roller 151. Transcript. The toner image is fixed on the paper 10 by the fixing device 143, and the post-processing unit 160 performs desired post-processing such as sorting and stapling on the paper 10 on which the fixing is completed.

  Next, each embodiment of the main part of the image forming apparatus 100 of the embodiment will be described.

  (First Embodiment: Claim 1) FIG. 1 is a schematic top view around the paper feeding device 21 and the pickup roller 1 in the first embodiment, and FIG. 2 is a diagram of the paper feeding device 21 and the pickup roller 1 in the first embodiment. It is a surrounding side surface schematic diagram.

  1 and 2 show a pickup roller 1, a shaft 1-1 integrated with the pickup roller 1, a paper feed roller 2, a shaft 2-1 integrated with the paper feed roller 2, a light receiving element, and a light emitting element. The sensor 3, the light receiving element, and the sensor fixing member 4 integrated with the light emitting element, the first transmission gear 5, the second transmission gear 6, the third transmission gear 7, the fourth transmission gear 41, and the fifth transmission gear 42. The states of the sheet feeding motor 8, the conveyance motor 9, the first transmission belt 11, the second transmission belt 12, and the paper 10 are shown. Further, a state is shown in which the paper 10 being double-fed when the paper 10 is conveyed can be separated by abutting the reverse roller 20 against the paper feed roller 2.

  With these configurations, the operation is as follows. A first transmission gear 5 that is transmitted by the first transmission belt 11 and rotates from the paper feed motor 8, a second transmission gear 6 that is rotated by the first transmission gear 5, and a third transmission that is rotated by the second transmission gear 6. The shaft 1-1 integrated with the gear 7, and further the third transmission gear 7 and the pickup roller 1 rotates in synchronization with the rotation of the third transmission gear 7, and the sheet 10 is rotated by the rotation of the pickup roller 1. Transport.

  Then, in the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction in a rotatable state, the transported paper 10 can be rotated to the same shaft portion as the shaft that rotates the paper feed roller 2. The state in the thickness direction of the paper 10 can be detected.

  FIG. 3 is a diagram showing how the thickness of the paper 10 and the state of the leading end are detected by the light receiving element and the sensor 3 integrated with the light emitting element. The light emitted from the light emitting element of the sensor 3 is focused on the point P, and the light reflected by this focus is detected by the light receiving element to detect the thickness and the leading end state of the paper 10. 3A shows a state at the start of feeding of the paper 10, FIG. 3B shows a state when the paper thickness is detected, and FIG. 3C shows a state after the paper thickness is detected.

(Second Embodiment: Claim 1 ) FIG. 4 is a schematic top view around the paper feeding device 21 and the pickup roller 1 in the second embodiment, and FIG. 5 is a diagram of the paper feeding device 21 and the pickup roller 1 in the second embodiment. It is a surrounding side surface schematic diagram.

  4 and 5 show the pickup roller 1, the shaft 1-1 integrated with the pickup roller 1, the paper feed roller 2, the shaft 2-1 integrated with the paper feed roller 2, the light receiving element and the light emitting element. The sensor 3, the light receiving element, and the sensor fixing member 4 integrated with the light emitting element, the first transmission gear 5, the second transmission gear 6, the third transmission gear 7, the fourth transmission gear 41, and the fifth transmission gear 42. The states of the sheet feeding motor 8, the conveyance motor 9, the first transmission belt 11, the second transmission belt 12, the paper 10, and the forward / reverse or reciprocating member 13 are shown. Further, a state is shown in which the paper 10 being double-fed when the paper 10 is conveyed can be separated by abutting the reverse roller 20 against the paper feed roller 2.

  With these configurations, the operation is as follows. A first transmission gear 5 that is transmitted by the first transmission belt 11 and rotates from the paper feed motor 8, a second transmission gear 6 that is rotated by the first transmission gear 5, and a third transmission that is rotated by the second transmission gear 6. The shaft 1-1 integrated with the gear 7, and further the third transmission gear 7 and the pickup roller 1 rotates in synchronization with the rotation of the third transmission gear 7, and the sheet 10 is rotated by the rotation of the pickup roller 1. Transport.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the paper 10 can be detected by operating the backward or reciprocating member 13.

(Third Embodiment: Claim 2 ) FIG. 6 is a schematic top view around the paper feeding device 21 and the pickup roller 1 in the third embodiment, and FIG. 7 is a diagram of the paper feeding device 21 and the pickup roller 1 in the third embodiment. It is a surrounding side surface schematic diagram.

  6 and 7 show the pickup roller 1, the shaft 1-1 integrated with the pickup roller 1, the paper feed roller 2, the shaft 2-1 integrated with the paper feed roller 2, the light receiving element and the light emitting element. The sensor 3, the light receiving element, and the sensor fixing member 4 integrated with the light emitting element, the first transmission gear 5, the second transmission gear 6, the third transmission gear 7, the fourth transmission gear 41, and the fifth transmission gear 42. The states of the sheet feeding motor 8, the conveyance motor 9, the first transmission belt 11, the second transmission belt 12, the paper 10, and the solenoid 14 are shown. Further, a state is shown in which the paper 10 being double-fed when the paper 10 is conveyed can be separated by abutting the reverse roller 20 against the paper feed roller 2.

  With these configurations, the operation is as follows. A first transmission gear 5 that is transmitted by the first transmission belt 11 and rotates from the paper feed motor 8, a second transmission gear 6 that is rotated by the first transmission gear 5, and a third transmission that is rotated by the second transmission gear 6. The shaft 1-1 integrated with the gear 7, and further the third transmission gear 7 and the pickup roller 1 rotates in synchronization with the rotation of the third transmission gear 7, and the sheet 10 is rotated by the rotation of the pickup roller 1. Transport.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state of the sheet 10 in the thickness direction can be detected by operating the solenoid 14 which is a backward or reciprocating member.

(Fourth Embodiment: Claim 3 ) FIG. 8 is a schematic top view around the paper feeding device 21 and the pickup roller 1 in the fourth embodiment, and FIG. 9 is a diagram of the paper feeding device 21 and the pickup roller 1 in the fourth embodiment. It is a surrounding side surface schematic diagram.

  8 and 9 show the pickup roller 1, the shaft 1-1 integrated with the pickup roller 1, the paper feed roller 2, the shaft 2-1 integrated with the paper feed roller 2, the light receiving element and the light emitting element. The sensor 3, the light receiving element, and the sensor fixing member 4 integrated with the light emitting element, the first transmission gear 5, the second transmission gear 6, the third transmission gear 7, the fourth transmission gear 41, and the fifth transmission gear 42. The states of the paper feed motor 8, the transport motor 9, the first transmission belt 11, the second transmission belt 12, the paper 10, and the actuator 15 are shown. Further, a state is shown in which the paper 10 being double-fed when the paper 10 is conveyed can be separated by abutting the reverse roller 20 against the paper feed roller 2.

  With these configurations, the operation is as follows. A first transmission gear 5 that is transmitted by the first transmission belt 11 and rotates from the paper feed motor 8, a second transmission gear 6 that is rotated by the first transmission gear 5, and a third transmission that is rotated by the second transmission gear 6. The shaft 1-1 integrated with the gear 7, and further the third transmission gear 7 and the pickup roller 1 rotates in synchronization with the rotation of the third transmission gear 7, and the sheet 10 is rotated by the rotation of the pickup roller 1. Transport.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the paper 10 can be detected by operating the actuator 15 which is a backward or reciprocating member.

(Fifth Embodiment: Reference Example ) FIG. 10 is a schematic top view of the periphery of the paper feeder 21 and the pickup roller 1 in the fifth embodiment, and FIG. 11 is the periphery of the paper feeder 21 and the pickup roller 1 in the fifth embodiment. FIG.

  10 and 11 show the pickup roller 1, the shaft 1-1 integrated with the pickup roller 1, the paper feed roller 2, the shaft 2-1 integrated with the paper feed roller 2, the light receiving element and the light emitting element. The sensor 3, the light receiving element, and the sensor fixing member 4 integrated with the light emitting element, the first transmission gear 5, the second transmission gear 6, the third transmission gear 7, the fourth transmission gear 41, and the fifth transmission gear 42. The states of the sheet feeding motor 8, the conveyance motor 9, the first transmission belt 11, the second transmission belt 12, the paper 10, the gear 16, the worm gear 17, and the sigma-shaped member 18 are shown. The sigma-shaped member 18 is biased to a predetermined position by a spring 38. Further, a state is shown in which the paper 10 being double-fed when the paper 10 is conveyed can be separated by abutting the reverse roller 20 against the paper feed roller 2.

  12 is a schematic side assembly diagram of the worm gear 17, FIG. 13 is a schematic side assembly diagram of the sensor 3, and FIG. 14 shows an assembled state of the sensor fixing member 4 and the sigma shaped member 18 of the sensor 3. It is a side assembly outline figure.

  FIG. 12 shows the state of the worm gear 17, the first worm gear support member 34, the second worm gear support member 35, the protruding member 33, and the retaining ring 32.

  13 shows the sensor 3 integrated with the light receiving element and the light emitting element, the sensor fixing member 4 integrated with the light receiving element and the light emitting element, the sensor fixing screw 28, the sensor mounting PCB 29, the sensor fixing member 30, and the sensor fixing member stopper. The state of the screw 31 is shown.

  FIG. 14 shows a state of the sensor fixing member 30, the sigma-shaped member 18, and the sigma-shaped member fixing screw 36 assembled in FIG.

  With these configurations, the operation is as follows. A first transmission gear 5 that is transmitted by the first transmission belt 11 and rotates from the paper feed motor 8, a second transmission gear 6 that is rotated by the first transmission gear 5, and a third transmission that is rotated by the second transmission gear 6. The shaft 1-1 integrated with the gear 7, and further the third transmission gear 7 and the pickup roller 1 rotates in synchronization with the rotation of the third transmission gear 7, and the sheet 10 is rotated by the rotation of the pickup roller 1. Transport.

  And the sensor 3 integrated with the light receiving element and the light emitting element arranged in an oblique direction in a state where the conveyed paper 10 can be rotated to the same axis part as the axis for rotating the paper feed roller 2, and The light receiving element is integrated with the sigma-shaped member 18, the gear 16 rotates, is transmitted to the worm gear 17, and the protrusion 33 a of the protrusion member 33 connected to the worm gear 17 rotates following the inner surface of the sigma-shaped member 18. In addition, the sensor 3 integrated with the light emitting element continues the forward, backward, or reciprocating motion, so that the state of the sheet 10 in the thickness direction can be detected.

(Sixth Embodiment: Claim 4 ) FIG. 15 is a block diagram of an overall control unit in the sixth embodiment, and FIG. 16 is a timing chart in the sixth embodiment. The sixth embodiment is a second embodiment having a forward / reverse or reciprocating member 13, a third embodiment having a solenoid 14 that is a forward / return or reciprocating member, and a forward / return or reciprocating member. In the image forming apparatus of the fourth embodiment provided with a certain actuator 15, it is an embodiment of various controls including control of the reciprocating member. Pickup roller 1, paper feed roller 2, sensor 3, sensor fixing member 4, first transmission gear 5, second transmission gear 6, third transmission gear 7, fourth transmission gear 41, fifth transmission gear 42, paper feed motor 8, the configuration and operation of the transport motor 9, the paper 10, the first transmission belt 11, the second transmission belt 12, the forward or backward or reciprocating member 13, and the reverse roller 20 are as described above.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the sheet 10 is detected by the backward or reciprocating member 13.

  The control unit 50 includes a CPU, a RAM, a ROM, a BUS, and an I / F (interface). The control unit 50 controls the paper feed motor 8 by a paper feed motor control unit 50a. Further, the reciprocating member driving unit 50b controls the forward / reverse or reciprocating member 13. Further, the digital signal output from the light receiving unit of the sensor 3 is measured by the digital signal measuring unit 50c.

  As shown in FIG. 16, the paper feed motor 8 is turned on by the paper feed motor control unit 50 a from the control unit 50 to transport the paper 10. Further, the light receiving element and the sensor 3 integrated with the light emitting element are turned ON. Further, a reciprocating member signal for controlling the reciprocating member 13 is turned ON by the reciprocating member driving unit 50b. The sensor 3 integrated with the light receiving element and the light emitting element detects the state of the leading end of the paper 10, and measures the digital signal output from the light receiving unit of the sensor 3 integrated with the light receiving element and the light emitting element. Thus, the state of the sheet 10 in the thickness direction can be detected.

(Seventh Embodiment: Claim 5 ) FIG. 17 is a block diagram of an overall control unit in the seventh embodiment, and FIG. 18 is a timing chart in the seventh embodiment. The seventh embodiment is a second embodiment having a forward / reverse or reciprocating member 13, a third embodiment having a solenoid 14 that is a forward / return or reciprocating member, and a forward / return or reciprocating member. In the image forming apparatus of the fourth embodiment provided with a certain actuator 15, it is an embodiment of various controls including control of the reciprocating member. Pickup roller 1, paper feed roller 2, sensor 3, sensor fixing member 4, first transmission gear 5, second transmission gear 6, third transmission gear 7, fourth transmission gear 41, fifth transmission gear 42, paper feed motor 8, the configuration and operation of the transport motor 9, the paper 10, the first transmission belt 11, the second transmission belt 12, the forward or backward or reciprocating member 13, and the reverse roller 20 are as described above.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the sheet 10 is detected by the backward or reciprocating member 13.

  The control unit 50 includes a CPU, a RAM, a ROM, a BUS, and an I / F (interface). The control unit 50 controls the paper feed motor 8 by a paper feed motor control unit 50a. Further, the reciprocating member driving unit 50b controls the forward / reverse or reciprocating member 13. Further, the digital signal output from the light receiving unit of the sensor 3 is measured by the pulse number measuring unit 50d.

  As shown in FIG. 18, the paper feed motor 8 is turned on by the paper feed motor control unit 50a from the control unit 50, and the paper 10 is conveyed. Further, the light receiving element and the sensor 3 integrated with the light emitting element are turned ON. Further, a reciprocating member signal for controlling the reciprocating member 13 is turned ON by the reciprocating member driving unit 50b. The sensor 3 integrated with the light receiving element and the light emitting element detects the state of the leading end of the paper 10, and the number of pulses of the digital signal output from the light receiving unit of the sensor 3 integrated with the light receiving element and the light emitting element is calculated. By measuring, the thickness direction state of the paper 10 can be detected.

(Eighth Embodiment: Claim 6 ) FIG. 19 is a block diagram of the overall control unit in the eighth embodiment, FIG. 20 is a timing chart at the time of double feed state detection in the eighth embodiment, and FIG. 21 is in the eighth embodiment. It is a timing chart at the time of non-feed state detection. The eighth embodiment is a second embodiment having a forward / reverse or reciprocating member 13, a third embodiment having a solenoid 14 that is a forward / return or reciprocating member, and a forward / return or reciprocating member. In the image forming apparatus of the fourth embodiment provided with a certain actuator 15, it is an embodiment of various controls including control of the reciprocating member. Pickup roller 1, paper feed roller 2, sensor 3, sensor fixing member 4, first transmission gear 5, second transmission gear 6, third transmission gear 7, fourth transmission gear 41, fifth transmission gear 42, paper feed motor 8, the configuration and operation of the transport motor 9, the paper 10, the first transmission belt 11, the second transmission belt 12, the forward or backward or reciprocating member 13, and the reverse roller 20 are as described above.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the paper 10 can be detected by operating the backward or reciprocating member 13.

  The control unit 50 includes a CPU, a RAM, a ROM, a BUS, and an I / F (interface). The control unit 50 controls the paper feed motor 8 by a paper feed motor control unit 50a. Further, the reciprocating member driving unit 50b controls the forward / reverse or reciprocating member 13. Further, the digital signal output from the light receiving unit of the sensor 3 is measured by the pulse number measuring unit 50d. Further, the abnormal processing control unit 50e detects the double feed state and the non-feed state.

  As shown in FIG. 20 and FIG. 21, the paper feed motor 8 is turned on by the paper feed motor control unit 50 a from the control unit 50 to transport the paper 10. Further, the light receiving element and the sensor 3 integrated with the light emitting element are turned ON. Further, a reciprocating member signal for controlling the reciprocating member 13 is turned ON by the reciprocating member driving unit 50b. The sensor 3 integrated with the light receiving element and the light emitting element detects the state of the leading end of the paper 10, and the number of pulses of the digital signal output from the light receiving unit of the sensor 3 integrated with the light receiving element and the light emitting element is calculated. measure.

  Then, as shown in FIG. 21, when the number of pulses of the digital signal output from the light receiving unit of the sensor 3 is less than the preset number, the paper 10 is not fed. In addition, as shown in FIG. 20, when the number of pulses of the digital signal output from the light receiving unit of the sensor 3 is larger than a preset number, it is determined that the paper 10 is in a double feed state and abnormal processing can be performed. It becomes.

Ninth Embodiment: Claim 7 FIG. 22 is a block diagram of the overall control unit in the ninth embodiment, and FIG. 23 is a flowchart in the ninth embodiment. The ninth embodiment is a second embodiment having a forward / reverse or reciprocating member 13, a third embodiment having a solenoid 14 that is a forward / return or reciprocating member, and a forward / return or reciprocating member. In the image forming apparatus of the fourth embodiment provided with a certain actuator 15, it is an embodiment of various controls including control of the reciprocating member. Pickup roller 1, paper feed roller 2, sensor 3, sensor fixing member 4, first transmission gear 5, second transmission gear 6, third transmission gear 7, fourth transmission gear 41, fifth transmission gear 42, paper feed motor 8, the configuration and operation of the transport motor 9, the paper 10, the first transmission belt 11, the second transmission belt 12, the forward or backward or reciprocating member 13, and the reverse roller 20 are as described above.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the paper 10 can be detected by operating the backward or reciprocating member 13.

  The control unit 50 includes a CPU, a RAM, a ROM, a BUS, and an I / F (interface). The control unit 50 controls the paper feed motor 8 by a paper feed motor control unit 50a. Further, the reciprocating member driving unit 50b controls the forward / reverse or reciprocating member 13. Further, the digital signal output from the light receiving unit 3-1 of the sensor 3 is measured by the pulse number measuring unit 50d. Further, the reverse roller 20 is controlled by the reverse solenoid controller 50f.

  As shown in FIG. 23, in step S1, the paper feed motor controller 50a turns on the paper feed motor 8 to transport the paper 10. In step S2, the sensor 3 integrated with the light receiving element and the light emitting element is turned ON by the sensor control unit. By turning on the pickup solenoid in step S3, the pickup roller 1 is brought into contact with the paper 10 in step S4, the paper 10 is moved in step S5, and the reciprocating member 13 is controlled by the reciprocating member driving unit 50b in step S6. Turn the reciprocating member signal ON. In step S7, the number of pulses of the digital signal output from the light receiving unit of the sensor 3 is measured. If the number of pulses of the digital signal output from the light receiving unit of the sensor 3 is the same as the preset number, in step S8. The paper 10 is transported, the paper feeding operation is terminated in step S9, the pickup solenoid is turned off in step S10, the reverse solenoid is turned off in the reverse solenoid controller 50f in step S11, and the paper feeding motor is controlled in step S12. The sheet feeding motor 8 is turned off at the section 50a, and the sheet feeding is finished.

  If the number of pulses of the digital signal output from the light receiving unit of the sensor 3 in step S7 is not the same as the number set in advance, the process proceeds to step S13, and the number of pulses of the digital signal output from the light receiving unit of the sensor 3 in step S13. Is greater than the preset number, it is determined that the paper 10 is in a double feed state, the reverse solenoid control unit 50f turns on the reverse solenoid in step S14, and the reverse roller 20 is pushed against the paper feed roller 2 in step S15. The sheet 10 fed in step S16 is separated and the process proceeds to step S8. In addition, when the number of pulses of the digital signal output from the light receiving unit of the sensor 3 in step S13 is smaller than the number set in advance, the operation of a tenth embodiment described later is performed.

  Thereby, when the number of pulses of the digital signal output from the light receiving unit of the sensor 3 is larger than the preset number, it is determined that the paper 10 is in a double feed state, and the reverse roller 20 is brought into contact with the paper feed roller 2. It becomes possible to separate the double-fed paper 10.

(Tenth Embodiment: Claim 8 ) FIG. 24 is a block diagram of an overall control unit in a tenth embodiment. The tenth embodiment is a second embodiment having a forward / reverse or reciprocating member 13, a third embodiment having a solenoid 14 that is a forward / return or reciprocating member, and a forward / return or reciprocating member. In the image forming apparatus of the fourth embodiment provided with a certain actuator 15, it is an embodiment of various controls including control of the reciprocating member. Pickup roller 1, paper feed roller 2, sensor 3, sensor fixing member 4, first transmission gear 5, second transmission gear 6, third transmission gear 7, fourth transmission gear 41, fifth transmission gear 42, paper feed motor 8, the configuration and operation of the transport motor 9, the paper 10, the first transmission belt 11, the second transmission belt 12, the forward or backward or reciprocating member 13, and the reverse roller 20 are as described above.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the paper 10 can be detected by operating the backward or reciprocating member 13.

  The control unit 50 includes a CPU, a RAM, a ROM, a BUS, and an I / F (interface). The control unit 50 controls the paper feed motor 8 by a paper feed motor control unit 50a. Further, the reciprocating member driving unit 50b controls the forward / reverse or reciprocating member 13. Further, the digital signal output from the light receiving unit of the sensor 3 is measured by the pulse number measuring unit 50d. Furthermore, the pickup roller 1 is controlled by the pickup solenoid controller 50g.

  The flowchart of the tenth embodiment is FIG. 23 described above, and steps S1 to S16 are as described in the ninth embodiment. If the number of pulses of the digital signal output from the light receiving unit of the sensor 3 in step S13 is smaller than the preset number, it is determined that the paper 10 is not fed, and in step S17, the pickup solenoid control unit 50g uses the pickup solenoid. In step S18, the pickup roller 1 is released. In step S19, the pickup solenoid controller 50g turns on the pickup solenoid again. In step S20, the pickup roller 1 is abutted against the paper 10. If the number of pulses of the digital signal output from the light receiving unit of the sensor 3 in step S21 is the same as the number set in advance, the process proceeds to step S8, and the number of pulses of the digital signal is not the same as the number set in advance. Returns to step S6.

  As a result, when the number of pulses of the digital signal output from the light receiving unit of the sensor 3 is smaller than the preset number, it is determined that the paper 10 is not fed, the pickup roller 1 is released, and the pickup roller 1 is turned on again. The sheet 10 can be transported by abutting against the sheet 10.

Eleventh Embodiment: Claim 9 FIG. 25 is a flowchart in the eleventh embodiment. The entire block is the same as in FIGS. 22 and 24, and the operation of each part is also the same. The eleventh embodiment is an image forming apparatus according to a third embodiment including a solenoid 14 that is a forward or backward or reciprocating member, and an image forming apparatus according to a fourth embodiment that includes an actuator 15 that is a forward or backward or reciprocating member. It is an embodiment of various controls including control of the reciprocating member. Pickup roller 1, paper feed roller 2, sensor 3, sensor fixing member 4, first transmission gear 5, second transmission gear 6, third transmission gear 7, fourth transmission gear 41, fifth transmission gear 42, paper feed motor 8, the configuration and operation of the transport motor 9, the paper 10, the first transmission belt 11, the second transmission belt 12, the forward or backward or reciprocating member 13, and the reverse roller 20 are as described above.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the paper 10 can be detected by operating the backward or reciprocating member 13.

  As shown in FIG. 25, Steps S1 to S16 are as described in the ninth embodiment. If the number of pulses of the digital signal output from the light receiving unit of the sensor 3 in step S13 is less than the preset number, it is determined that the paper 10 is not fed, and in step S22 the feed motor control unit 50a instantaneously In step S23, the pickup roller 1 is rotated in the reverse direction. In step S24, the sheet feeding motor control unit 50a rotates the sheet feeding motor 8 in the normal direction to rotate the pickup roller 1 in the normal direction. In step S25, the reciprocating member signal for controlling the reciprocating member 13 is turned off by the reciprocating member driving unit 50b. If the number of pulses of the digital signal output from the light receiving unit of the sensor 3 in step S26 is the same as the number set in advance, the process proceeds to step S8, and the number of pulses of the digital signal is not the same as the number set in advance. Returns to step S6.

  Thereby, when the number of pulses of the digital signal output from the light receiving unit of the sensor 3 is smaller than the preset number, it is determined that the paper 10 is not fed, the pickup roller 1 is rotated in the reverse direction, and the paper feed motor is again turned on. By rotating 8 forwardly, the paper 10 can be conveyed.

(Twelfth Embodiment: Claim 10 ) FIG. 26 is a flowchart in the twelfth embodiment. The entire block is the same as in FIGS. 22 and 24, and the operation of each part is also the same. The eleventh embodiment is an image forming apparatus according to a third embodiment including a solenoid 14 that is a forward or backward or reciprocating member, and an image forming apparatus according to a fourth embodiment that includes an actuator 15 that is a forward or backward or reciprocating member. It is an embodiment of various controls including control of the reciprocating member. Pickup roller 1, paper feed roller 2, sensor 3, sensor fixing member 4, first transmission gear 5, second transmission gear 6, third transmission gear 7, fourth transmission gear 41, fifth transmission gear 42, paper feed motor 8, the configuration and operation of the transport motor 9, the paper 10, the first transmission belt 11, the second transmission belt 12, the forward or backward or reciprocating member 13, and the reverse roller 20 are as described above.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the paper 10 can be detected by operating the backward or reciprocating member 13.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the paper 10 can be detected by operating the backward or reciprocating member 13.

  As shown in FIG. 26, steps S1 to S16 are as described in the ninth embodiment. If the number of pulses of the digital signal output from the light receiving unit of the sensor 3 in step S13 is smaller than the preset number, it is determined that the paper 10 is not fed, and in step S27, the paper feed motor control unit 50a instantaneously In step S28, the current of the paper feed motor 8 is returned to a steady value by the paper feed motor control unit 50a, and in step S29, the reciprocating member drive unit 50b is used to turn the reciprocating member 13 on. The reciprocating member signal to be controlled is turned OFF. If the number of pulses of the digital signal output from the light receiving unit of the sensor 3 in step S30 is the same as the number set in advance, the process proceeds to step S8, and the number of pulses of the digital signal is not the same as the number set in advance. Returns to step S6.

  Thereby, when the number of pulses of the digital signal output from the light receiving unit of the sensor 3 is smaller than the preset number, it is determined that the paper 10 is not fed, and the current of the paper feed motor 8 is instantaneously increased. The paper 10 can be conveyed.

Thirteenth Embodiment: Reference Example FIG. 27 is a flowchart in the thirteenth embodiment. The entire block is the same as in FIGS. 22 and 24, and the operation of each part is also the same. The eleventh embodiment is an image forming apparatus according to a third embodiment including a solenoid 14 that is a forward or backward or reciprocating member, and an image forming apparatus according to a fourth embodiment that includes an actuator 15 that is a forward or backward or reciprocating member. It is an embodiment of various controls including control of the reciprocating member. Pickup roller 1, paper feed roller 2, sensor 3, sensor fixing member 4, first transmission gear 5, second transmission gear 6, third transmission gear 7, fourth transmission gear 41, fifth transmission gear 42, paper feed motor 8, the configuration and operation of the transport motor 9, the paper 10, the first transmission belt 11, the second transmission belt 12, the forward or backward or reciprocating member 13, and the reverse roller 20 are as described above.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the paper 10 can be detected by operating the backward or reciprocating member 13.

  As shown in FIG. 27, steps S1 to S16 are as described in the ninth embodiment. If the number of pulses of the digital signal output from the light receiving unit of the sensor 3 in step S13 is smaller than the number set in advance, it is determined that the paper 10 is not fed, and in step S31 the feed motor control unit 50a instantaneously The pulse width for driving the paper feed motor 8 is increased, the pulse width for driving the paper feed motor 8 is returned to a steady value by the paper feed motor control unit 50a in step S32, and the reciprocating member driving unit is driven in step S33. At 50b, the reciprocating member signal for controlling the reciprocating member 13 is turned OFF. If the number of pulses of the digital signal output from the light receiving unit of the sensor 3 in step S34 is the same as the number set in advance, the process proceeds to step S8, and the number of pulses of the digital signal is not the same as the number set in advance. Returns to step S6.

  Thereby, when the number of pulses of the digital signal output from the light receiving unit of the sensor 3 is smaller than the preset number, it is determined that the paper 10 is not fed, and the pulse width of the paper feed motor 8 is instantaneously increased. Thus, the paper 10 can be transported.

(Fourteenth Embodiment: Reference Example ) FIG. 28 is a flowchart in the fourteenth embodiment. The entire block is the same as in FIGS. 22 and 24, and the operation of each part is also the same. The eleventh embodiment is an image forming apparatus according to a third embodiment including a solenoid 14 that is a forward or backward or reciprocating member, and an image forming apparatus according to a fourth embodiment that includes an actuator 15 that is a forward or backward or reciprocating member. It is an embodiment of various controls including control of the reciprocating member. Pickup roller 1, paper feed roller 2, sensor 3, sensor fixing member 4, first transmission gear 5, second transmission gear 6, third transmission gear 7, fourth transmission gear 41, fifth transmission gear 42, paper feed motor 8, the configuration and operation of the transport motor 9, the paper 10, the first transmission belt 11, the second transmission belt 12, the forward or backward or reciprocating member 13, and the reverse roller 20 are as described above.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the paper 10 can be detected by operating the backward or reciprocating member 13.

  As shown in FIG. 28, the fourteenth embodiment is a combination of the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, and the thirteenth embodiment. The processing of each block in S34 is the same as described with reference to FIGS. 23, 25, 26, and 27.

  That is, if the number of pulses of the digital signal output from the light receiving unit 3-1 of the sensor 3 in step S13 is smaller than the preset number, it is determined that the paper 10 is not fed, and the pickup solenoid is turned off in step S17. In step S18, the pickup roller 1 is released. In step S19, the pickup solenoid is turned on again. In step S20, the pickup roller 1 is abutted against the paper 10. If the number of pulses of the digital signal output from the light receiving unit of the sensor 3 in step S21 is the same as the number set in advance, the process proceeds to step S8, and the number of pulses of the digital signal is not the same as the number set in advance. Determines that the paper 10 is not fed, and proceeds to step S22.

  In step S22, the paper feed motor controller 50a instantaneously reverses the paper feed motor 8, reversely rotates the pick-up roller 1 in step S23, re-rotates the pick-up roller 1 forward in step S24, and reciprocates in step S25. Turn off the motion member signal. If the number of pulses of the digital signal output from the light receiving unit of the sensor 3 in step S26 is the same as the number set in advance, the process proceeds to step S8, and the number of pulses of the digital signal is not the same as the number set in advance. Determines that the paper 10 is not fed, and proceeds to step S27.

  In step S27, the current of the paper feed motor 8 is instantaneously increased. In step S28, the current of the paper feed motor 8 is returned to a steady value, and in step S29, the reciprocating member signal is turned off. If the number of pulses of the digital signal output from the light receiving unit of the sensor 3 in step S30 is the same as the number set in advance, the process proceeds to step S8, and the number of pulses of the digital signal is not the same as the number set in advance. Determines that the paper 10 is not fed, and proceeds to step S31.

  In step S31, the pulse width for driving the paper feed motor 8 is instantaneously increased. In step S32, the pulse width for driving the paper feed motor 8 is returned to a steady value. In step S33, the reciprocating member signal is turned off. If the number of pulses of the digital signal output from the light receiving unit of the sensor 3 in step S34 is the same as the number set in advance, the process proceeds to step S8, and the number of pulses of the digital signal is not the same as the number set in advance. Returns to step S6.

  In this way, the combination described above prevents the paper 10 from being unfed, further separates the transported material being fed, and transports the paper 10.

(Fifteenth embodiment: reference example ) FIG. 29 is an overall block diagram of the fifteenth embodiment, and FIG. 30 is a flowchart in the fifteenth embodiment. The overall block diagram of FIG. 29 is also an overall block diagram of 16th to 18th embodiments described later. The fifteenth embodiment is an image forming apparatus according to a third embodiment including a solenoid 14 that is a forward / backward or reciprocating member, and a fourth embodiment including an actuator 15 that is a forward / backward or reciprocating member. It is an embodiment of various controls including control of the reciprocating member. Pickup roller 1, paper feed roller 2, sensor 3, sensor fixing member 4, first transmission gear 5, second transmission gear 6, third transmission gear 7, fourth transmission gear 41, fifth transmission gear 42, paper feed motor 8, the configuration and operation of the transport motor 9, the paper 10, the first transmission belt 11, the second transmission belt 12, the forward or backward or reciprocating member 13, and the reverse roller 20 are as described above.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the paper 10 can be detected by operating the backward or reciprocating member 13.

  The control unit 50 includes a CPU, a RAM, a ROM, a BUS, and an I / F (interface). The control unit 50 controls the paper feed motor 8 by a paper feed motor control unit 50a. Further, the reciprocating member driving unit 50b controls the forward / reverse or reciprocating member 13. Further, the digital signal output from the light receiving unit 3-1 of the sensor 3 is measured by the digital signal measuring unit 50c. The counter unit 22 measures and stores the pulse width of the digital signal. Further, the current of the fixing heater 24-1 of the fixing unit 24 is controlled by the heater control unit 50h. The motor control unit 50j controls the conveyance motor, the intermediate motor, the registration motor, the fixing motor that rotates the fixing roller 26, and the main motor. Further, the reverse roller 20 is controlled by the reverse solenoid controller 50f. Furthermore, the pickup roller 1 is controlled by the pickup solenoid controller 50g.

  As shown in FIG. 30, in step S41, the paper feed motor controller 50a turns on the paper feed motor 8 to transport the paper 10. In step S42, the sensor control unit turns on the sensor 3 integrated with the light receiving element and the light emitting element. By turning on the pickup solenoid in step S43, the pickup roller 1 is abutted against the paper 10 in step S44, the paper 10 is moved in step S45, and the reciprocating member 13 is controlled by the reciprocating member driving unit 50b in step S46. Turn the reciprocating member signal ON.

  In step S47, the pulse width of the digital signal output from the light receiving unit 3-1 of the sensor 3 is measured. In step S48, the current of the fixing heater 24-1 at the time of fixing corresponding to the measured pulse width value is stored. In step S49, the paper 10 is transported. In step S50, the paper feeding operation is terminated. Next, in step S51, the pickup solenoid is turned off. In step S52, the reverse solenoid control unit 50f turns off the reverse solenoid. In step S53, the paper feed motor control unit 50a turns off the paper feed motor 8. finish.

  Next, in step S54, the motor controller 50j turns on the conveyance motor, in step S55, the paper feed motor controller 50a turns off the paper feed motor 8, and in step S56, the motor controller 50j turns off the intermediate motor. In step S57, the motor controller 50j turns off the conveyance motor. In step S58, the motor controller 50j turns on the registration motor. In step S59, the motor controller 50j turns off the intermediate motor.

  Next, in step S60, a stored current corresponding to the measured paper is set. In step S61, the main motor is turned on by the motor control unit 50j. In step S62, the fixing motor is turned on by the motor control unit 50j. In step S63, the motor controller 50j turns on the conveyance motor. In step S64, the motor controller 50j turns off the registration motor. In step S65, the motor controller 50j turns off the main motor. In step S66. The fixing motor is turned off by the motor control unit 50j, the conveyance motor is turned off by the motor control unit 50j in step S67, and the conveyance is finished.

  Thereby, the pulse width of the digital signal output from the light receiving unit of the sensor 3 is measured, the current corresponding to the measured paper is stored, and when the corresponding paper passes through the fixing unit 24, the fixing heater of the fixing unit 24 The current of 24-1 can be controlled. Therefore, the fixing accuracy can be improved even if the thickness of the paper 10 changes.

(Sixteenth Embodiment: Reference Example ) FIG. 31 is a flowchart in the sixteenth embodiment. The overall block diagram of the sixteenth embodiment is the same as FIG. The sixteenth embodiment is an image forming apparatus according to a third embodiment including a solenoid 14 that is a forward / backward or reciprocating member, and a fourth embodiment including an actuator 15 that is a forward / backward or reciprocating member. It is an embodiment of various controls including control of the reciprocating member. Pickup roller 1, paper feed roller 2, sensor 3, sensor fixing member 4, first transmission gear 5, second transmission gear 6, third transmission gear 7, fourth transmission gear 41, fifth transmission gear 42, paper feed motor 8, the configuration and operation of the transport motor 9, the paper 10, the first transmission belt 11, the second transmission belt 12, the forward or backward or reciprocating member 13, and the reverse roller 20 are as described above.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the paper 10 can be detected by operating the backward or reciprocating member 13.

  Similarly to the above, the control unit 50 includes a CPU, RAM, ROM, BUS, and I / F (interface), and the control unit 50 controls the paper feed motor 8 by the paper feed motor control unit 50a. Further, the reciprocating member driving unit 50b controls the forward / reverse or reciprocating member 13. Further, the digital signal output from the light receiving unit of the sensor 3 is measured by the digital signal measuring unit 50c. The counter unit 22 measures and stores the pulse width of the digital signal. Further, the current of the fixing heater 24-1 of the fixing unit 24 is controlled by the heater control unit 50h. The motor control unit 50j controls the conveyance motor, the intermediate motor, the registration motor, the fixing motor that rotates the fixing roller 26, and the main motor. Further, the reverse roller 20 is controlled by the reverse solenoid controller 50f. Furthermore, the pickup roller 1 is controlled by the pickup solenoid controller 50g.

  As shown in FIG. 31, also in the sixteenth embodiment, steps S41 to S67 are the same as steps S41 to S67 of FIG. Next to step S60, the process proceeds to step S71. If the pulse width of the digital signal measured and stored in step S47 is the same as the preset pulse width value in step S71, the process proceeds to step S61. Advances to step S72. In step S72, if the pulse width of the measured and stored digital signal is larger than the preset pulse width value, in step S73, the fixing heater 24-1 at the time of fixing corresponding to the measured pulse width value. The current is increased and the process proceeds to step S61. If the pulse width of the digital signal is smaller than the preset pulse width value at step S72, the current of the fixing heater 24-1 at the time of fixing corresponding to the measured pulse width is decreased at step S74. Proceed to step S61.

  Thereby, the pulse width of the digital signal output from the light receiving portion of the sensor 3 is measured, and when the pulse width is larger than a preset value, the paper thickness is thick, so the current of the fixing heater 24-1 of the fixing portion 24 is increased. And the temperature of the fixing unit 24 is increased, so that fixing can be performed at an appropriate temperature even if the paper thickness is thick. Further, when the pulse width is smaller than the preset value, the paper thickness is thin. Therefore, the current of the fixing heater 24-1 of the fixing unit 24 is decreased, the temperature of the fixing unit 24 is decreased, and the paper thickness is changed. Can be fixed at an appropriate temperature. Therefore, the fixing accuracy can be improved even if the thickness of the paper 10 changes.

(Seventeenth Embodiment: Reference Example ) FIG. 32 is a flowchart in the seventeenth embodiment. The overall block diagram of the seventeenth embodiment is the same as FIG. The seventeenth embodiment is an image forming apparatus according to a third embodiment including a solenoid 14 that is a forward / backward / reciprocating member, and a fourth embodiment including an actuator 15 that is a forward / backward / reciprocating member. It is an embodiment of various controls including control of the reciprocating member. Pickup roller 1, paper feed roller 2, sensor 3, sensor fixing member 4, first transmission gear 5, second transmission gear 6, third transmission gear 7, fourth transmission gear 41, fifth transmission gear 42, paper feed motor 8, the configuration and operation of the transport motor 9, the paper 10, the first transmission belt 11, the second transmission belt 12, the forward or backward or reciprocating member 13, and the reverse roller 20 are as described above.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the paper 10 can be detected by operating the backward or reciprocating member 13.

  Similarly to the above, the control unit 50 includes a CPU, RAM, ROM, BUS, and I / F (interface), and the control unit 50 controls the paper feed motor 8 by the paper feed motor control unit 50a. Further, the reciprocating member driving unit 50b controls the forward / reverse or reciprocating member 13. Further, the digital signal output from the light receiving unit 3-1 of the sensor 3 is measured by the digital signal measuring unit 50c. The counter unit 22 measures and stores the pulse width of the digital signal. Further, the current of the fixing heater 24-1 of the fixing unit 24 is controlled by the heater control unit 50h. The motor control unit 50j controls the conveyance motor, the intermediate motor, the registration motor, the fixing motor that rotates the fixing roller 26, and the main motor. Further, the reverse roller 20 is controlled by the reverse solenoid controller 50f. Furthermore, the pickup roller 1 is controlled by the pickup solenoid controller 50g.

  As shown in FIG. 32, in the seventeenth embodiment, steps S41 to S47 and steps S49 to S67 are the same as steps S41 to S47 and steps S49 to S67 of FIG. In step S48 ', the number of rotations of the fixing motor for fixing roller control at the time of fixing according to the measured pulse width value is stored, and the process proceeds to step S49.

  After step S60, the process proceeds to step S75. When the pulse width of the digital signal measured and stored in step S47 is the same as the preset pulse width value, the process proceeds to step S61. Advances to step S76. If the pulse width of the digital signal measured and stored in step S76 is larger than the preset pulse width value, in step S77, the fixing roller control fixing at the time of fixing corresponding to the measured pulse width value is performed. The number of rotations of the motor is reduced and the process proceeds to step S61. If the pulse width of the digital signal is smaller than the preset pulse width value in step S76, the number of rotations of the fixing motor for fixing roller control at the time of fixing corresponding to the value measured in step S78 is determined. Increase and go to step S61.

  As a result, the pulse width of the digital signal output from the light receiving unit of the sensor 3 is measured. If the pulse width is larger than a preset value, the paper thickness is thick, and the motor control unit 50j fixes the fixing unit 24. Control is performed such that the rotation speed of the fixing motor rotating the roller 26 is decreased, the speed of passing the fixing unit 24 is decreased, and the passing time of the fixing roller 26 is increased. When the pulse width is smaller than the preset value, the paper thickness is thin, so that the motor controller 50j increases the number of rotations of the fixing motor that rotates the fixing roller 26 of the fixing unit 24, thereby fixing the fixing unit 24. The speed of passing the toner is increased, and the time for passing the fixing roller 26 is shortened. Thereby, even if the paper thickness changes, it can be fixed at an appropriate temperature. Therefore, the fixing accuracy can be improved even if the thickness of the paper 10 changes.

(Eighteenth Embodiment: Reference Example ) FIG. 33 is a flowchart in the eighteenth embodiment. The overall block diagram of the eighteenth embodiment is the same as FIG. The eighteenth embodiment is the image forming apparatus according to the third embodiment including a solenoid 14 that is a forward / backward or reciprocating member, and the fourth embodiment including an actuator 15 that is a forward / backward or reciprocating member. It is an embodiment of various controls including control of the reciprocating member. Pickup roller 1, paper feed roller 2, sensor 3, sensor fixing member 4, first transmission gear 5, second transmission gear 6, third transmission gear 7, fourth transmission gear 41, fifth transmission gear 42, paper feed motor 8, the configuration and operation of the transport motor 9, the paper 10, the first transmission belt 11, the second transmission belt 12, the forward or backward or reciprocating member 13, and the reverse roller 20 are as described above.

  Then, the transported paper 10 is rotated to the same shaft portion as the shaft that rotates the paper feed roller 2, and the sensor 3 integrated with the light receiving elements and the light emitting elements arranged in an oblique direction is moved forward. Alternatively, the state in the thickness direction of the paper 10 can be detected by operating the backward or reciprocating member 13.

  Similarly to the above, the control unit 50 includes a CPU, RAM, ROM, BUS, and I / F (interface), and the control unit 50 controls the paper feed motor 8 by the paper feed motor control unit 50a. Further, the reciprocating member driving unit 50b controls the forward / reverse or reciprocating member 13. Further, the digital signal output from the light receiving unit 3-1 of the sensor 3 is measured by the digital signal measuring unit 50c. The counter unit 22 measures and stores the pulse width of the digital signal. Further, the current of the fixing heater 24-1 of the fixing unit 24 is controlled by the heater control unit 50h. The motor control unit 50j controls the conveyance motor, the intermediate motor, the registration motor, the fixing motor that rotates the fixing roller 26, and the main motor. Further, the reverse roller 20 is controlled by the reverse solenoid controller 50f. Furthermore, the pickup roller 1 is controlled by the pickup solenoid controller 50g.

  As shown in FIG. 33, in the eighteenth embodiment, steps S41 to S48 ′ and steps S49 to S67 are the same as steps S41 to S48 ′ and steps S49 to S67 of FIG.

  After step S60, the process proceeds to step S81. When the pulse width of the digital signal measured and stored in step S47 is the same as the preset pulse width value, the process proceeds to step S61. Advances to step S82. In step S82, if the pulse width of the measured and stored digital signal is larger than the preset pulse width value, in step S83, the fixing heater 24-1 at the time of fixing corresponding to the measured pulse width value. In step S84, the number of rotations of the fixing motor for fixing roller control at the time of fixing corresponding to the measured pulse width is decreased, and the process proceeds to step S61.

  If the pulse width of the digital signal is smaller than the preset pulse width value in step S82, the current of the fixing heater 24-1 during fixing corresponding to the measured pulse width is decreased in step S85. In step S86, the number of rotations of the fixing motor for controlling the fixing roller at the time of fixing corresponding to the measured pulse width is increased, and the process proceeds to step S61.

  Thereby, the pulse width of the digital signal output from the light receiving portion of the sensor 3 is measured, and when the pulse width is larger than a preset value, the paper thickness is thick, so the current of the fixing heater 24-1 of the fixing portion 24 is increased. , The temperature of the fixing unit 24 is increased, and the motor controller 50j is rotating the fixing roller 26 of the fixing unit 24. The rotation speed of the fixing motor is decreased and the speed of passing through the fixing unit 24 is increased. Is controlled so that the passage time of the fixing roller 26 becomes longer. If the pulse width is smaller than a preset value, the paper thickness is thin, so the current of the fixing heater 24-1 of the fixing unit 24 is decreased, the temperature of the fixing unit 24 is decreased, and the motor control unit 50j. Thus, the number of rotations of the fixing motor that rotates the fixing roller 26 of the fixing unit 24 is increased, the speed of passing through the fixing unit 24 is increased, and the passing time of the fixing roller 26 is shortened. Thereby, even if the paper thickness changes, it can be fixed at an appropriate temperature. Therefore, the fixing accuracy can be improved even if the thickness of the paper 10 changes.

  As the sensor 3 integrated with the light receiving element and the light emitting element, for example, “Point Spot Infrared LED Type (KR1227)” manufactured by Shinko Electronics Co., Ltd. (homepage: www.shinko-elecs.jp/) is used. Further, as the solenoid 14 and the actuator 15, a solenoid, an actuator, or the like manufactured by Hosiden Corporation (www.hosiden.co.jp/) can be used.

DESCRIPTION OF SYMBOLS 1 Pickup roller 1-1 Axis 2 Paper feed roller 3 Sensor 4 Sensor fixing member 13 Forward / reverse or reciprocating member 14 Solenoid 15 Actuator 20 Reverse roller 100 Image forming apparatus

JP 2004-269199 A Japanese Patent Laid-Open No. 11-255381 JP-A-10-279133 Japanese Patent Laid-Open No. 10-198093 Japanese Utility Model Publication No. 4-49139

Claims (10)

To the same shaft portion and the shaft for rotating the feed roller, in a rotatable state, place the sensor integrated with the light receiving element and a light-emitting element in an oblique direction, encounters an image forming apparatus to detect the sheet edge to be conveyed And
An image forming apparatus, wherein the light receiving element and a sensor integrated with the light emitting element are moved forward, backward, or reciprocally in a circumferential direction of the same shaft as a shaft that rotates the paper feed roller . A sensor integrated with the light-receiving element and the light-emitting element,往又the circumferential direction of the same shaft and the shaft for rotating the feed roller in the mechanism for backward or reciprocates claim 1, characterized in that providing the solenoid The image forming apparatus described in 1. A sensor integrated with the light-receiving element and the light-emitting element, according to claim 1往又the circumferential direction of the same shaft and the shaft for rotating the paper feed roller, characterized in that the mechanism for backward or reciprocates, the actuator is provided The image forming apparatus described in 1. Sensor integrated with the light-receiving element and the light-emitting element detects the leading edge condition of the conveyance object, according to any one of claims 1 to 3, characterized in that to measure the digital signal output from the light receiving portion Image forming apparatus. A sensor integrated with the light receiving element and the light emitting element detects the state of the tip of the conveyed product, and the number of pulses detected in the thickness direction of the conveyed product is measured by a digital signal output from the light receiving unit. The image forming apparatus according to claim 4 . 6. The image forming apparatus according to claim 5 , wherein when the number of pulses does not coincide with a preset number, an abnormality process is performed. The image forming apparatus according to claim 6 , wherein when the number of pulses is larger than a preset number, the reverse roller is abutted against the paper feed roller. The image forming apparatus according to claim 6 , wherein when the number of pulses is smaller than a preset number, the pickup roller is released from abutting against the conveyed object and is again abutted against the conveyed object. The image forming apparatus according to claim 6 , wherein when the number of pulses is smaller than a preset number, the pickup roller is reversely rotated and rotated forward again. The image forming apparatus according to claim 6 , wherein when the number of pulses is smaller than a preset number, the current of the driving motor that rotates the pickup roller is increased.

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