JP4659285B2 - Rotation transmission device and duplex printing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotation transmission device and a duplex printing apparatus using the rotation transmission device.
[0002]
[Prior art]
2. Description of the Related Art In printers and copiers that employ an electrophotographic system, a duplex printing apparatus that can print an image on both sides of a recording sheet is used.
[0003]
Conventionally, there is a duplex printing apparatus shown in FIG. That is, the duplex printing apparatus includes a printing conveyance path 1 that prints an image on one side while conveying recording paper, and a printing conveyance roller that is provided in the printing conveyance path 1 and rotates in the conveyance direction to convey the recording paper. 2, a discharge path 3 that is provided continuously at the outlet of the print conveyance path 1 and receives the recording paper that has been printed on one side in the print conveyance path 1 and discharges the recording paper that has been printed on both sides, and this discharge path 3, a discharge roller 4 that rotates in the discharge direction to discharge the recording paper and rotates the recording paper in the reverse direction opposite to the discharge direction, and reverses and sends the recording paper, and an outlet and an inlet of the print conveyance path 1. And a reversal transport path 5 that transports the recording paper that is provided side by side with the print transport path 1 and that is reversed and sent out from the discharge path 3 to the print transport path 1, and a reversal transport direction provided in the reversal transport path 5. Rotate the recording paper and rotate it to reverse. , A first motor (main motor) M1 that rotates the conveyance roller 2 for printing, and a second motor that rotates the conveyance roller 6 for reversal and the discharge roller 4 via the rotation transmission belt 7 (reversal). Motor) M2.
[0004]
In this double-sided printing apparatus, the first motor drives printing and conveyance, and the second motor drives recording paper discharge and reverse conveyance. That is, in the case of single-sided printing, the second motor M2 rotates the discharge roller 4 in the same direction as the direction in which the transport roller 2 is rotated by the first motor M1, and discharges the recording paper that has finished single-sided printing. In the case of double-sided printing, the process of transporting the recording paper that has undergone single-sided printing to the discharge path 3 is the same as in the case of single-sided printing, but after the first motor M1 is stopped driving, the second motor M2 Is rotated in the opposite direction to the first motor M1 and the discharge roller 4 is rotated in the reverse direction, so that the recording paper is switched back, the reverse conveyance path 5 is reversed and conveyed while the print conveyance path 1 is conveyed again. Print the other side of the paper. Thereafter, the second motor M2 is driven again in the transport direction, the transport roller 4 is rotated in the transport direction, and the recording paper on which double-sided printing has been completed is discharged from the discharge path 3.
[0005]
[Problems to be solved by the invention]
In the conventional double-sided printing apparatus, the operation of discharging the recording paper that has been printed by the conveyance roller 4 and the recording in which the conveyance roller 5 is reversed in the opposite direction to the discharge (conveyance) in the case of double-sided printing and finished single-sided printing. Both operations for conveying the paper to the reverse conveyance path 5 are performed by the second motor M2. For this reason, the next operation cannot be performed unless one of the recording paper discharge and the reverse conveyance is finished. That is, when the operation proceeds from the previous operation to the next operation, the driving of the second motor M2 is temporarily stopped. After that, an operation for starting and rotating the second motor in the reverse direction is necessary, and thus it is necessary to reverse the second motor M2.
[0006]
Accordingly, in the conventional double-sided printing apparatus, since the double-sided printing time for one sheet of recording paper is long and only double-sided printing can be performed for each sheet of recording paper, continuous printing is required when performing double-sided printing of a plurality of sheets of recording paper. As a result, it took a very long time.
[0007]
Therefore, conventionally, to develop a rotation transmission device that can quickly perform normal rotation and reverse rotation of a rotating body rotated by this motor without stopping the driving of the motor, and to equip this rotation transmission device Therefore, it is desired to develop a double-sided printing apparatus capable of performing double-sided printing capable of continuously performing double-sided printing of a plurality of sheets while shortening the double-sided printing time for each sheet.
[0008]
An object of this invention is to provide the rotation transmission apparatus which can perform the normal rotation and reverse rotation of the rotary body rotated by this motor rapidly and easily, without stopping the drive of a motor.
[0009]
In addition, the present invention provides a double-sided printing apparatus equipped with the rotation transmission device to reduce the double-sided printing time for each sheet and perform double-sided printing capable of continuously performing double-sided printing on a plurality of sheets. With the goal.
[0010]
[Means for Solving the Problems]
  A rotation transmission device according to a first aspect of the present invention includes a switching rotator, an input gear that is provided on one side of the switching rotator on a central axis thereof, is meshed with a driving gear, and is rotated in a fixed direction. A plurality of sets of intermediate gears that are provided on one side surface of the switching rotating body at intervals in the circumferential direction and that are arranged in parallel with the central axis and meshed with the input gear to rotate. An output gear that is provided at a fixed position around the switching rotator and that rotates around the central axis by the rotation of the switching rotator, the plurality of sets of intermediate gears meshing with each other, and an output gear; Switching control means for intermittently stopping the rotation about the central axis at each position where the plurality of sets of intermediate gears mesh with the output gear, and the switching rotator includes the input gear and the switching gear. Through the intermediate gear Der which is rotated by receiving rotation is reachedThe switching control means is provided with a plurality of notches in the peripheral portion of the switching rotator at circumferential intervals, and detachably engages with the respective notches of the switching rotator. A claw body, and a drive mechanism that engages and disengages the claw body with respect to the notch.It is characterized by that.
[0011]
  According to the configuration of the first aspect of the present invention, the forward rotation and the reverse rotation of the rotating body rotated by the motor can be quickly and easily performed without stopping the driving of the motor while targeting a single motor as a drive source. It can be carried out.Further, it is possible to provide a switching control means that performs an operation utilizing the function of the switching rotating body to which the rotation is applied by utilizing the rotation of the motor of the driving source, with a simple configuration.
[0012]
  According to a second aspect of the present invention, there is provided a rotation transmission device comprising: a switching rotator; one input that is provided on one side of the switching rotator on a central axis thereof and meshes with a driving gear to be rotated in a fixed direction. The other input gear provided on the other side of the gear and the switching rotator on the central axis thereof, meshed with the driving gear and rotated in a fixed direction, and a side portion on one side of the switching rotator One intermediate gear provided in parallel to the central axis and rotated by meshing with the one input gear and the other intermediate side surface of the switching rotating body in the circumferential direction with respect to the one intermediate gear Provided at different positions and provided in a fixed position around one side of the switching rotating body, the other intermediate gear arranged parallel to the central axis and rotated by meshing with the other input gear. By the rotation of the switching rotator The one intermediate moving around the serial central axisGears meshOne output gear to be rotated and a rotation shaft that is common to the one output gear and is provided around the other side of the switching rotator, and moves around the central axis by the rotation of the switching rotator. The other output gear rotated by meshing with the other intermediate gear and the rotation of the switching rotator about the central axis are intermittent at each position where the both intermediate gears mesh with the output gear. And the switching rotating body is rotated by receiving the rotation transmitted from both the input gears via the both intermediate gears.The switching control means is provided with a plurality of notches in the peripheral portion of the switching rotator at circumferential intervals, and detachably engages with the respective notches of the switching rotator. A claw body, and a drive mechanism that engages and disengages the claw body with respect to the notch.It is characterized by that.
[0014]
  Claim 3The double-sided printing apparatus of the invention includes a printing conveyance path that prints an image on one side of the recording paper while conveying the recording paper, a printing conveyance roller that is provided in the printing conveyance path and rotates in the conveyance direction and conveys the recording paper, A discharge path that is continuously provided at the exit of the print conveyance path and receives the recording paper that has been printed on one side in the print conveyance path and discharges the recording paper that has been printed on both sides, and a discharge direction that is provided in this discharge path The print transport path by discharging the recording paper and rotating the recording paper in the reverse direction opposite to the discharge direction and reversing and feeding the recording paper, and connecting the outlet and the entrance of the print transport path. And a reverse conveyance path that conveys the recording paper that is reversed and sent out from the discharge path to the printing conveyance path, and is rotated in the reverse conveyance direction provided in the reverse conveyance path and reversely conveys the recording paper. A reversing conveying roller, and the mark A first motor that rotates the conveying roller, a second motor that rotates the reversing conveying roller, an input gear that is rotated by the first motor, and an output gear that is rotated by the discharge roller. Rotate by giving rotationClaim 1The rotation transmission device is provided.
[0015]
  Claim 3According to the configuration of the invention, the rotation transmission device according to the invention of claim 1 is provided to reduce the double-sided printing time for each sheet, and the double-sided printing capable of continuously performing the double-sided printing of a plurality of sheets is performed. be able to.
[0016]
  Claim 4The double-sided printing apparatus of the invention includes a printing conveyance path that prints an image on one side of the recording paper while conveying the recording paper, a printing conveyance roller that is provided in the printing conveyance path and rotates in the conveyance direction and conveys the recording paper, A discharge path that is continuously provided at the exit of the print conveyance path and receives the recording paper that has been printed on one side in the print conveyance path and discharges the recording paper that has been printed on both sides, and a discharge direction that is provided in this discharge path The print transport path by discharging the recording paper and rotating the recording paper in the reverse direction opposite to the discharge direction and reversing and feeding the recording paper, and connecting the outlet and the entrance of the print transport path. And a reverse conveyance path that conveys the recording paper that is reversed and sent out from the discharge path to the printing conveyance path, and is rotated in the reverse conveyance direction provided in the reverse conveyance path and reversely conveys the recording paper. A reversing conveying roller, and the mark A first motor that rotates the conveying roller for rotation, a second motor that rotates the conveying roller for reversing, and one input gear that is rotated by the first motor and the other input gear is rotated. Rotated by the rotation of the second motor, and one output gear and the other output gear rotate the discharge roller to rotate.Claim 2The rotation transmission device is provided.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
FIGS. 1 to 11 relate to this embodiment. FIGS. 1 and 2 are front views schematically showing a rotation transmission device, FIG. 3 is a perspective view showing the rotation transmission device, and FIG. FIG. 5 to FIG. 11 are diagrams schematically illustrating a configuration, and FIGS. 5 to 11 are diagrams schematically illustrating a printing operation in the double-sided printing apparatus.
[0018]
The configuration of the duplex printing apparatus will be described with reference to FIG. This double-sided printing apparatus is applied to an image forming apparatus employing an electrophotographic system, for example, a printer.
[0019]
  In FIG. 4, reference numeral 11 denotes a print conveyance path for printing an image on one side of the recording paper while conveying the recording paper. The print conveyance path 11 includes a combination of the photosensitive drum 12 and the transfer device 13 and fixing rollers 14 and 14A. Is the combination from the upstream side to the downstream side of the recording paper conveyance direction?JustThey are arranged at intervals. Further, at the entrance of the printing conveyance path 11, a conveyance roller 15 that rotates in the direction of conveying the recording paper and conveys the recording paper along the printing conveyance path 11 is provided. Reference numeral 15A denotes a pinch roller that is combined with and brought into contact with the conveying roller 15. Reference numeral 16 denotes a paper feed roller, which feeds out recording sheets made of cut sheets stacked and accommodated in a cassette (not shown) one by one and feeds them to the entrance of the transport path 11.
[0020]
Reference numeral 21 denotes a discharge path. The discharge path 21 is continuously provided at the exit of the print conveyance path 11. In the case of single-sided printing, the recording paper that has finished printing in the print conveyance path 11 is discharged, and in the case of double-sided printing, printing is performed. This is a path for receiving the recording paper that has been printed on one side in the transport path and discharging the recording paper that has been printed on both sides. The discharge path 21 is provided with discharge rollers 22 and 23 at intervals in the recording paper conveyance direction. The discharge rollers 22 and 23 rotate in the discharge direction to discharge the recording paper and are opposite to the discharge direction. The recording paper is reversed and sent out by rotating in the reverse direction.
[0021]
Reference numeral 31 denotes a reverse conveyance path. The reverse conveyance path 31 connects the outlet and the entrance of the print conveyance path 11 and is provided side by side with the print conveyance path 11, and prints the recording paper that is reversed and sent out from the discharge path 21. This is a path for transporting to the transport path 11. The reverse conveyance path 31 is provided with conveyance rollers 32 and 33 with a gap in the recording paper conveyance direction, and these conveyance rollers 32 and 33 rotate in the reverse conveyance direction to reversely convey the recording paper. .
[0022]
  In the drawing, M1 is a first motor (main motor), and this motor M1 is a photosensitive drum provided in the print conveyance path 11.12The fixing roller 14 is rotated in the transport direction via a rotation transmission device (not shown), and the transport roller 15 and the paper feed roller 16 are rotated in the transport direction via a rotation transmission device (not shown). The first motor M1 rotates the discharge roller 22 provided in the discharge path 21 in the discharge direction and the reverse conveyance direction via a rotation transmission device 50 described later. The rotation of the discharge roller 22 is transmitted to the discharge roller 23 via a rotation transmission device (not shown).
[0023]
M2 is a second motor, and this motor M2 rotates the conveyance rollers 32 and 33 provided in the reverse conveyance path 31 in the reverse conveyance direction via a rotation transmission device (not shown).
[0024]
C is a sensor that is provided at a branch point between the exit of the print transport path 11 and the entrance of the reverse transport path 31 and detects the passage of the trailing edge and outputs a detection signal when the recording paper is transported or reverse transported. The detection signal of the sensor C is used as a signal for performing a switching operation of the rotation transmission device 50 described later.
[0025]
The rotation transmission device 50 will be described with reference to FIGS. 1 to 3. In FIGS. 1 to 3, the gear is represented by a pitch circle, and the tooth portion is omitted. The rotation transmission device 50 is provided below the end of the roller shaft 22a to which the discharge roller 22 is attached.
[0026]
In the figure, reference numeral 51 denotes a switching rotator having a disk shape, and this switching rotator 51 is rotatably supported on a horizontal central shaft 52. Reference numeral 53 denotes a single input gear having a smaller diameter than the switching rotator 51, which is positioned on one side of the switching rotator 51 and is rotatably supported by a central shaft 52 on the central axis. A drive side gear 58A meshes with the input gear 53. The drive side gear 58A meshes with a drive side gear 58B that is rotated by the first motor M1, and the drive rotation of the first motor M1 The drive side gears 58B and 58A rotate, and the input gear 53 is rotated by the drive side gear 58A.
[0027]
Reference numeral 54 denotes a first intermediate gear having a diameter smaller than that of the input gear 53. The first intermediate gear 54 is disposed on two sides of the switching rotator 51 at two symmetrical points with the input gear 53 interposed therebetween. It is rotatably supported by a shaft 52a attached to one side surface of the switching rotator 51 in parallel with the central shaft 52. The pair of first intermediate gears 54 is disposed around the input gear 53 and meshes therewith.
[0028]
Reference numerals 55 and 56 denote second intermediate gears meshed with each other. The combination of the second intermediate gears 55 and 56 is sandwiched between a pair of first intermediate gears 54 on one side of the switching rotating body 51. The input gear 53 is interposed in the region at two locations that are symmetrical points, and are rotatably supported by shafts 55 a and 56 a that are attached to one side surface of the switching rotating body 51 in parallel with the central shaft 52. That is, the second intermediate gears 55 and 56 are arranged around the input gear 53 so that the intermediate gear 55 meshes with the input gear 53, and the intermediate gear 56 is positioned in the circumferential direction of the switching rotator 51 with respect to the intermediate gear 55. Is meshed with the second intermediate gear 55 arranged with a shift.
[0029]
Here, the pitch circle of the first intermediate gear 54 and the pitch circle of the second intermediate gear 56 are in contact with the pitch circle P drawn with a predetermined radius around the central axis 52 from the inside. The pitch circle P is drawn to surround the first intermediate gear 54 and the second intermediate gears 55 and 56 and to have a smaller radius than the switching rotating body 51.
[0030]
An output gear 57 is attached to the end of a horizontal roller shaft 22a to which the discharge roller 22 provided in the discharge path 21 is attached. The roller shaft 22a and the central shaft 52 are arranged in parallel. That is, when the output gear 57 rotates, the roller shaft 22a rotates and the discharge roller 22 rotates. The output gear 57 is disposed above the first intermediate gear 54 and the second intermediate gears 55 and 56 on one side of the upper edge of the switching rotator 51, and the pitch circle thereof is the first intermediate gear 54. And a pitch circle P surrounding the second intermediate gears 55 and 56 from the outside.
[0031]
The relationship between the input gear 53, the intermediate gear 54, and the output gear 57 (shown in FIG. 1) is that the output gear 57 rotates in the same direction (solid line direction) as the input gear 53 via the intermediate gear 54 due to the rotation of the input gear 53. Is done. The rotation direction of the output gear 57 is the same as the rotation direction of the conveyance roller 15 in the printing conveyance path 11 and the rotation direction when the discharge roller 22 is discharged. The transmission gear ratio (tooth ratio) of the intermediate gear 54 is set so that the rotational speed of the output gear 57 is equal to the rotational speed when the transport roller 15 transports the recording paper.
[0032]
The relationship between the input gear 53, the intermediate gears 55 and 56, and the output gear 57 (shown in FIG. 2) is opposite to the rotation direction of the output gear 57 when the intermediate gear 54 is interposed by the rotation of the input gear 53 (broken line). Direction). The rotation direction of the output gear 57 is the same as the rotation direction of the conveyance rollers 32 and 33 in the reverse conveyance path 31 (shown in FIG. 7) and the rotation direction during the reverse conveyance of the discharge roller 22. The speed ratio (tooth ratio) obtained by combining the intermediate gears 55 and 56 is such that the rotational speed of the output gear 57 is equal to the rotational speed when the transport rollers 32 and 33 and the discharge roller 22 reversely transport the recording paper. Set to. Note that the rotation speed when the conveyance roller 15 conveys the recording paper and the rotation speed when the conveyance rollers 32 and 33 and the discharge roller 22 reversely convey the recording paper are generally for stable printing. Equal size.
[0033]
Further, in the rotation transmission device 50, the first intermediate gear 54 and the second intermediate gears 55 and 56 mesh with the output gear 57 for rotation about the central axis (center axis) 52 of the switching rotator 51. Switching control means for intermittently stopping at each position is provided. The configuration in this embodiment will be described. A total of four notches 61a, 61b, 61c, 61d corresponding to a pair of first intermediate gears 54 and two sets of second intermediate gears 55, 56 are provided on the outer periphery of the switching rotating body 51 in the circumferential direction, etc. It is formed at intervals. Each of the notches 61a to 61d has a shape that allows rotation in one direction of the switching rotator 51 and prevents rotation in the opposite direction. In this embodiment, as will be described later, the switching rotator 51 is used as the input gear. Since it rotates in the same rotation direction (solid line direction) as 53, it has a shape that prevents rotation in this direction. The notches 61a and 61c are for stopping the first intermediate gear 54 at a position where the first intermediate gear 54 is engaged with the output gear 57, and the notches 61b and 61d are at a position where the second intermediate gears 55 and 56 are engaged with the output gear 57. It is to stop.
[0034]
Reference numeral 62 denotes a claw lever 62 which is an example of a claw body provided adjacent to the switching rotator 51. The claw lever 62 has a claw 62a which engages with the notches 61a to 61d at the tip. The claw lever 62 is pivotally supported by a shaft 63 provided in the middle of the claw lever 62 in parallel with the central shaft 52 so that the claw 62a swings in a direction to be engaged with and disengaged from the cutout portions 61a to 61d of the switching rotator 51. Is provided.
[0035]
64 is a solenoid that is an example of a drive mechanism. A plunger 65 provided in the solenoid 64 is attracted and pulled in, for example, when the solenoid is energized, and a force is applied in a direction in which it is pushed out by the compression coil spring 66 when not energized. It has been added. The plunger 65 is connected to the base end portion of the claw lever 62. When the plunger 65 moves to the outside of the solenoid, the claw lever 62 is swung in a direction approaching the switching rotary body 51, and the plunger 65 moves to the inside of the solenoid. When this occurs, the claw lever 62 is swung in a direction away from the switching rotator 51. The solenoid 64 is excited by a signal from the sensor C described above.
[0036]
  In the rotation transmission device 50 configured as described above, when the input gear 53 is rotated in the direction of the solid line by the drive side gear 58A, the first gear meshing with the input gear 53 is engaged.ofThe intermediate gear 54 and the second intermediate gear 55 are rotated, respectively, and a rotational force in the direction indicated by the arrow is applied to the switching rotating body 51. When the switching rotator 51 rotates about the central shaft 52, the first intermediate gear 54 is supported by the shaft 54a and meshes with the input gear 53 to rotate (spin) while the input gear rotates.53Revolves around with a predetermined radius. The second intermediate gears 55 and 56 are supported by shafts 55a and 56a, and are input gears.53Revolves around with a predetermined radius. The intermediate gear 55 meshes with the input gear 53 and rotates (spins), and the intermediate gear 56 meshes with the intermediate gear 55 and rotates (spins). When the first intermediate gear 54 and the second intermediate gear 56 revolve and reach the upper end of the switching rotator 51, they mesh with the output gear 57 at a fixed position above the switching rotator 51. That is, the planetary gear operates.
[0037]
  As shown in FIG. 1, when the first intermediate gear 54 meshes with the output gear 57, the rotation of the input gear 53 is transmitted to the output gear 57 via the first intermediate gear 54, and the output gear 57 moves in the direction of the solid line in the figure. Further, the discharge roller 22 is rotated via the roller shaft 22a. Further, as shown in FIG. 2, the second intermediate gear55Is engaged with the output gear 57, the rotation of the input gear 53 is transmitted to the output gear 57 via the second intermediate gears 55, 56, the output gear 57 is rotated in the direction of the broken line in the figure, and the discharge roller 22 further rotates. Is done.
[0038]
The claw lever 62 of the switching control means is always swung in the direction approaching the switching rotator 51 by the spring 66, and the claw 62a is moved to the four notches 61a, 61b, 61c and 61d of the switching rotator 51. Is engaged to prevent the rotation of the switching rotator 51 in the solid line direction. When the claw 62a of the claw lever 62 engages with the notches 61a and 61c of the switching rotator 51, the rotation of the switching rotator 51 is prevented in a state where the first intermediate gear 54 is engaged with the output gear 57, and the claw lever 62 When the claw 62a is engaged with the notches 61b and 61d of the switching rotator 51, the rotation of the switching rotator 51 is prevented while the second intermediate gear 56 is engaged with the output gear 57. When the solenoid 64 is excited and the claw lever 62 is swung away from the switching rotator 51, the claw 62a is separated from the notches 61a, 61b, 61c and 61d, and the switching rotator 51 rotates. Therefore, the claw lever 62 is swung by the operation of the solenoid 64 to control the rotation of the switching rotator 51, thereby engaging the first intermediate gear 54 and the output gear 57, and the second intermediate gear 56 and the output. The meshing with the gear 57 can be switched, that is, the rotation transmission by the first intermediate gear 54 and the rotation transmission by the second intermediate gears 55 and 56 can be switched and controlled. By this switching, the rotation direction of the output gear 47 can be reversed.
[0039]
In this manner, the rotation transmission device 50 adopts the planetary gear system and can perform the switching operation while the input gear 53 is rotated to switch the rotation direction of the output gear 57. Therefore, the rotation of the input gear 53 is stopped and the switching is performed. Switching control can be performed quickly in a short time compared with the case where it is performed. In other words, by adopting a planetary gear mechanism under the limited condition of targeting a single motor as a drive source, the rotation of the rotating body rotated by this motor is stopped without stopping the motor drive. Rotation and reversal can be performed quickly and easily.
[0040]
Although not shown, if the switching rotator 51 can be stopped between the first intermediate gear 54 and the second intermediate gears 55 and 56 with respect to the output gear 57, the intermediate gear is separated from the output gear 57. The rotation transmission to the output gear 57 can be cut off. Furthermore, by changing the gear ratio of each of the two types of intermediate gears, not only the rotation direction of the output gear can be changed, but also the rotation speed and torque of the output gear can be selected. Furthermore, not only two types of intermediate gears but also three or more types can be provided.
[0041]
The switching control means of this embodiment forms a notch portion arranged in the circumferential direction on the switching rotator 51, a swingable claw lever 62 that engages with and disengages from the notch portion, and a solenoid that swings the claw lever 62. By providing 64, it is possible to provide, with a simple configuration, switching control means for performing an operation utilizing the function of the switching rotating body to which the rotation is applied by utilizing the rotation of the motor M1 as the driving source.
[0042]
Next, the operation of the double-sided printing apparatus using this rotation transmission device 50 will be described with reference to FIGS.
[0043]
In the printing conveyance path 11, the conveyance motor 15 is always rotated in the conveyance direction by the first motor M1. In the reverse conveyance path 31, the conveyance rollers 32 and 33 are always rotated in the reverse conveyance direction by the second motor M2. In the discharge path 21, the rotation direction of the discharge roller 22 is switched by switching control of the rotation transmission device 50 according to the conveyance direction of the recording paper P accompanying printing.
[0044]
In FIG. 5, the following operation is performed. In the rotation transmission device 50, the first intermediate gear 54 meshes with the output gear 57 to transmit the rotation, and the discharge roller 22 is rotated in the discharge direction indicated by the solid line. The first recording paper P <b> 1 is supplied to the printing conveyance path 11 from a cassette (not shown) by the paper supply roller 16. While the first recording sheet P is being conveyed by the conveying roller 15, the image formed on the photosensitive drum 12 is transferred onto one surface of the recording sheet P1 by the transfer device 13, and then this image is fixed by the fixing rollers 14A and 14B. Further, the recording paper P1 is conveyed in the discharge direction by the discharge roller 22 in the discharge path 21 to be printed on one side.
[0045]
In FIG. 6, the following operation is performed. When the trailing edge of the recording paper P1 that has finished printing on one side passes through the branch portion between the printing conveyance path 11 and the reverse conveyance path 31, the sensor C detects this. In response to the signal from the sensor C, the rotation transmission device 50 operates the solenoid 64 to swing the claw lever 62 to rotate the switching rotator 51 to mesh the second intermediate gear 56 with the output gear 47. The rotation is transmitted to rotate the discharge roller 22 in the reverse conveyance direction. In this case, the rotation of the discharge roller 22 can be quickly reversed without stopping the rotation of the first motor M1 and the rotation of the discharge roller 22.
[0046]
In FIG. 7, the recording paper P <b> 1 that has finished printing on one side is conveyed from the discharge path 21 to the reverse conveyance path 31 by the rotation of the discharge roller 23 in the reverse conveyance direction. Further, two recording papers P2 are printed on one side while being transported through the print transport path 11.
[0047]
In FIG. 8, the following operation is performed. When the trailing edge of the recording paper P1 conveyed through the reverse conveyance path 31 passes the sensor C, the sensor C detects this. In response to the signal from the sensor C, the rotation transmission device 50 operates the solenoid 64 to swing the claw lever 62 to rotate the switching rotating body 51 to mesh the first intermediate gear 54 with the output gear 47 again. Then, the rotation is transmitted and the discharge roller 23 is rotated in the discharge direction. In this case, the rotation of the discharge roller 22 can be quickly reversed without stopping the rotation of the first motor M1 and the rotation of the discharge roller 22. Thereafter, the second recording paper P that has been printed on one side is conveyed to the discharge path 21 and further conveyed in the discharge direction by the discharge roller 22.
[0048]
In FIG. 9, the following operation is performed. The first recording paper P1 is transported through the reverse transport path 31. When the second recording sheet P2 is conveyed in the discharge direction by the discharge path 21 and the trailing end thereof passes the sensor C, the discharge roller 22 is rotated in the reverse conveyance direction by the switching operation in the rotation transmission device 50 described above.
[0049]
In FIG. 10, the following operation is performed. The first recording paper P1 is conveyed again from the reverse conveyance path 31 to the printing conveyance path 11, and the image is transferred and fixed on the other surface of the recording paper P1 as described above, and printing is performed. Thus, printing is performed on both sides of the first recording sheet P. The second recording paper P2 is transported through the reverse transport path 31.
[0050]
In FIG. 11, the following operation is performed. When the second recording paper P2 is conveyed by the reverse conveyance path 31 and the trailing edge thereof passes the sensor C, the discharge roller 22 is rotated in the discharge direction by the switching operation of the rotation transmission device 50 described above. Thereafter, the first recording paper P2 that has finished printing on the other side (finished double-sided printing) is transported from the print transport path 11 to the discharge path 21, and is further discharged from the discharge path 21 to the outside. Further, the third recording paper P3 is supplied to the printing transport path 11 and printing on one side is performed. In this case, the rotation of the conveyance rollers 32 and 33 in the reverse conveyance path 31 is stopped, and the conveyance of the second recording paper P2 is stopped. Thereafter, when the third recording paper P3 for which single-sided printing has been completed is conveyed to the discharge path 21 and the rear end thereof is detected by the sensor C, the printing on the other surface of the second recording paper P2 and the third recording paper are performed. The recording paper P3 is reversed and conveyed.
[0051]
As described above, this double-sided printing apparatus is equipped with the rotation transmission device 50, so that when the recording paper after the single-sided printing is reversed, there is no mechanical stop (stagnation) for performing the reversing operation. Easily move to reverse conveyance. For this reason, it is possible to reduce the time for double-sided printing for each sheet by an economical means of using only the first motor M1, and to perform double-sided printing capable of continuously performing double-sided printing on a plurality of sheets. it can.
[0052]
Next, another embodiment will be described with reference to FIGS.
This embodiment uses a second motor in addition to the first motor as a drive motor. FIG. 12 is a diagram schematically showing the rotation transmission device, FIG. 13 is a perspective view showing the rotation transmission device, and FIGS. 12 and 13 are views in which a rotation transmission portion by a second motor is added to FIGS. The same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals.
[0053]
That is, in the figure, 53A is the same input gear as the input gear 53, which is disposed on the other side of the switching rotator 51 and is rotatably provided on the central shaft 52. A drive side gear 59A is meshed with the input gear 53A. A drive side gear 59B rotated by the second motor M2 is meshed with the gear 59A, and the gear 59B, The rotation is transmitted by 59A, and the input gear 53A is rotated in the same rotational direction as the input gear 53 at the same rotational speed. 57A is an output gear having the same specifications as the output gear 57, and is disposed on the other side of the switching rotary body 51 and is integrally attached to the roller shaft 22a of the discharge roller 22. Further, on the other side surface of the switching rotator 51, the same circumference as the position where the two second intermediate gears 55 and 56 are attached to one side surface portion of the switching rotator 51 in the above-described embodiment. Intermediate gears 55 </ b> A and 56 </ b> A are attached in parallel to the central shaft 52 at positions (different from the intermediate gear 54). Of these two sets of intermediate gears 55 </ b> A and 56 </ b> A, the gear 55 </ b> A always meshes with the input gear 53, and the gear 56 </ b> A meshes with the output gear 57 when moved to the output gear 57 by the rotation of the switching rotary body 51.
[0054]
  That is, basically, this rotation transmission device is provided on one side of the switching rotator 51 on the central axis thereof and rotated in one direction and on the other side of the switching rotator 51. The other input gear 53A provided on the central axis and rotated in a certain direction, and one input gear 53 provided on one side surface of the switching rotating body 51 and arranged in parallel with the central axis. One intermediate gear 54 that is engaged and rotated and the other side surface portion of the switching rotator 51 are provided with different positions in the circumferential direction with respect to the one intermediate gear 54 and are arranged parallel to the central axis. The other intermediate gears 55A and 56A, which are meshed with the other input gear 53A and rotated, are provided at fixed positions around one side of the switching rotator 51, and move around the central axis by the rotation of the switching rotator 51. on the other hand Intermediate gear54Is connected to a rotating shaft common to the one output gear 57 and provided around the switching rotary body 51 and is moved around the central axis by the rotation of the switching rotary body 51. And the other output gear 57A rotated by meshing with the other intermediate gear 56A.
[0055]
In the rotation transmission device 50A configured in this way, the input gear 53 on one side of the switching rotator 51 is rotated in the direction of the solid line by the first motor M1, and the other side of the switching rotator 51 is rotated by the second motor M2. The input gear 53A is rotated in the direction of the solid line in the figure. The first intermediate gear 54 and the second intermediate gear 55A mesh with the input gears 53 and 53A and rotate, and a rotational force in the solid line direction is applied to the switching rotator 51. The switching control means described above controls the rotation of the switching rotator 51 to move the first intermediate gear 54 on one side of the switching rotator 51 to the output gear 57, and the switching rotator 51. The second intermediate gears 55A and 56A on the other side of 51 are switched to the operation of moving to the output gear 57A and meshing. As a result, the output gear 57 is rotated in the direction of the solid line, the output gear 57A is rotated in the direction of the broken line, and the discharge roller 22 is rotated in the transport direction and the reverse transport direction via the roller shaft 22a that rotates forward and reverse.
[0056]
By adopting the planetary gear mechanism for the two motors M1 and M2 as drive sources in this way, the forward rotation of the discharge roller 22 rotated by this motor without stopping the motor drive M1 and M2, The reversal can be performed quickly and easily.
[0057]
FIG. 14 shows a double-sided printing apparatus using this rotation transmission device 50A. The basic configuration is the same as FIG. 4, and the same parts as those in FIG. That is, FIG. 14 shows that in addition to the first motor M1, the second motor M2 is connected to the rotation transmission device 50A.
[0058]
In this way, by using the first motor M1 and the second motor M2, the double-sided printing that shortens the double-sided printing time for each recording sheet and can continuously perform the double-sided printing of a plurality of sheets. It can be performed.
[0059]
In addition, this invention is not limited to embodiment mentioned above, It can implement by changing variously.
[0060]
【The invention's effect】
  According to the rotation transmission device of the first aspect of the present invention, the driving of the motor is not stopped by adopting the planetary gear mechanism under the limited condition of targeting a single motor as a drive source. The forward and reverse rotations of the rotating body rotated by this motor can be performed quickly and easily.Further, it is possible to provide a switching control means that performs an operation utilizing the function of the switching rotating body to which the rotation is applied by utilizing the rotation of the motor of the driving source, with a simple configuration.
[0061]
  According to the rotation transmission device of the invention of claim 2, by adopting a planetary gear mechanism for two motors as drive sources, a rotating body rotated by this motor without stopping the driving of the motor. The normal rotation and reverse rotation can be performed quickly and easily.Further, it is possible to provide a switching control means that performs an operation utilizing the function of the switching rotating body to which the rotation is applied by utilizing the rotation of the motor of the driving source, with a simple configuration.
[0063]
  Claim 3According to the double-sided printing device of the invention, the rotation transmission device of the invention of claim 1 is equipped, and the double-sided printing time for each sheet is shortened by an economical means of using only the first motor, Double-sided printing can be performed in which multiple-sided double-sided printing can be performed continuously.
[0064]
  Claim 4According to the double-sided printing device of the invention, the rotation transmission device of the invention of claim 2 is equipped, and the double-sided printing time for each sheet is shortened by using the first motor and the second motor, Double-sided printing that can perform double-sided printing of multiple sheets continuouslyDobe able to.
[Brief description of the drawings]
FIG. 1 is a front view schematically showing a rotation transmission device according to an embodiment of the present invention.
FIG. 2 is a front view schematically showing a rotation transmission device in the embodiment.
FIG. 3 is a perspective view showing a rotation transmission device according to the embodiment.
FIG. 4 is a diagram schematically showing a double-sided printing apparatus according to the embodiment.
FIG. 5 is a diagram schematically illustrating a printing operation in the duplex printing apparatus according to the embodiment.
FIG. 6 is a diagram schematically illustrating a printing operation in the double-sided printing apparatus according to the embodiment.
FIG. 7 is a diagram schematically showing a printing operation in the double-sided printing apparatus of the embodiment.
FIG. 8 is a diagram schematically showing a printing operation in the double-sided printing apparatus of the embodiment.
FIG. 9 is a diagram schematically illustrating a printing operation in the double-sided printing apparatus according to the embodiment.
FIG. 10 is a diagram schematically illustrating a printing operation in the double-sided printing apparatus according to the embodiment.
FIG. 11 is a diagram schematically illustrating a printing operation in the duplex printing apparatus according to the embodiment.
FIG. 12 is a front view schematically showing a rotation transmission device according to another embodiment.
FIG. 13 is a perspective view showing a rotation transmission device according to the embodiment.
FIG. 14 is a diagram schematically illustrating a duplex printing apparatus according to the embodiment.
FIG. 15 schematically illustrates a conventional double-sided printing apparatus.
[Explanation of symbols]
11: Printing transport path
15 ... Conveying roller
21 ... Discharge path
22 ... discharge roller
31 ... Reverse conveyance path
32 ... Conveying roller
33 ... Conveying roller
51. Switching rotating body
52 ... Center axis
53 ... Input gear
54. First intermediate gear
55. Second intermediate gear
56. Second intermediate gear
57 ... Output gear
58 ... Drive side gear
61a-61d ... Notch
62 ... Claw lever
64 ... Solenoid

Claims (4)

A switching rotator,
An input gear that is provided on one side of the switching rotator and is located on the central axis thereof, meshes with the drive-side gear and is rotated in a fixed direction,
A plurality of sets of intermediate gears provided on one side surface portion of the switching rotor at intervals in the circumferential direction, and arranged in parallel with the central axis and rotated in mesh with the input gear; ,
An output gear which is provided at a fixed position around the switching rotator and is rotated by sequentially engaging the plurality of sets of intermediate gears which move around the central axis by rotation of the switching rotator;
Switching control means for intermittently stopping the rotation of the switching rotator about the central axis at each position where the plurality of sets of intermediate gears mesh with the output gear,
The switching rotator is rotated by receiving rotation transmitted from the input gear via the intermediate gear,
The switching control means is provided with a plurality of notches provided in the circumferential portion of the switching rotator at intervals in the circumferential direction, and a claw body detachably engaged with each notch of the switching rotator. , and rotation transmitting device, characterized in that is provided a drive mechanism for engagement and disengagement with respect to the notch of the pawl member. A switching rotator,
One input gear provided on one side of the switching rotator and positioned on the central axis thereof, meshed with a drive side gear and rotated in a fixed direction, and the central axis on the other side of the switching rotator The other input gear provided on the line and meshed with the drive side gear and rotated in a certain direction;
One intermediate gear provided on one side surface of the switching rotator and arranged in parallel with the central axis and meshed with the one input gear, and on the other side of the switching rotator The other intermediate gear provided on the side surface portion with the circumferential position different from that of the one intermediate gear, and arranged parallel to the central axis and meshed with the other input gear;
One output gear which is provided at a fixed position around one side of the switching rotator and is rotated by meshing with the one intermediate gear which moves around the central axis by rotation of the switching rotator; and Mounted on the same rotary shaft as one of the output gears, provided around the other side of the switching rotator, and rotated by the rotation of the switching rotator and the other intermediate gear meshing with the other intermediate gear. The other output gear to be
Switching control means for intermittently stopping the rotation of the switching rotator about the central axis at each position where both the intermediate gears mesh with the output gear,
The switching rotator is rotated by receiving rotation transmitted from both the input gears via both the intermediate gears,
The switching control means is provided with a plurality of notches provided in the circumferential portion of the switching rotator at intervals in the circumferential direction, and a claw body detachably engaged with each notch of the switching rotator. , and rotation transmitting device, characterized in that is provided a drive mechanism for engagement and disengagement with respect to the notch of the pawl member. A printing conveyance path for printing an image on one side of the recording paper while conveying the recording paper;
A conveyance roller for printing, which is provided in the printing conveyance path and rotates in the conveyance direction to convey the recording paper;
A discharge path that is continuously provided at an exit of the print conveyance path, receives a recording sheet that has been printed on one side in the print conveyance path, and discharges the recording sheet that has been printed on both sides;
A discharge roller that is provided in the discharge path, rotates in the discharge direction and discharges the recording paper, and rotates in the reverse direction opposite to the discharge direction to reverse and send the recording paper;
A reversing conveyance path that connects the outlet and the inlet of the printing conveyance path and is arranged alongside the printing conveyance path, and that conveys the recording paper that is reversed and sent out from the discharge path to the printing conveyance path;
A reversing conveying roller that is provided in the reversing conveying path and rotates in the reversing conveying direction to reversely convey the recording paper;
A first motor for rotating the printing transport roller;
A second motor for rotating the reverse conveying roller;
The double-sided printing apparatus comprising: the rotation transmission device according to claim 1, wherein the input gear is rotated by being rotated by the first motor and the output gear is rotated by rotating the discharge roller. . A printing conveyance path for printing an image on one side of the recording paper while conveying the recording paper;
A conveyance roller for printing, which is provided in the printing conveyance path and rotates in the conveyance direction to convey the recording paper;
A discharge path that is continuously provided at an exit of the print conveyance path, receives a recording sheet that has been printed on one side in the print conveyance path, and discharges the recording sheet that has been printed on both sides;
A discharge roller that is provided in the discharge path, rotates in the discharge direction and discharges the recording paper, and rotates in the reverse direction opposite to the discharge direction to reverse and send the recording paper;
A reversing conveyance path that connects the outlet and the inlet of the printing conveyance path and is arranged alongside the printing conveyance path, and that conveys the recording paper that is reversed and sent out from the discharge path to the printing conveyance path;
A reversing conveying roller that is provided in the reversing conveying path and rotates in the reversing conveying direction to reversely convey the recording paper;
A first motor for rotating the printing transport roller;
A second motor for rotating the reverse conveying roller;
One input gear is rotated by the first motor and rotated, the other input gear is rotated by the second motor and rotated, and one output gear and the other output gear are A duplex transmission device comprising: a rotation transmission device according to claim 2 , wherein the rotation transmission device is rotated by rotating the discharge roller.

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