JP6822015B2 - Conveyor device, image forming device and image reading device - Google Patents

Description

The present invention relates to a transport device, an image forming device and an image reading device.

A paper transport device for stably pulling out and transporting continuously folded paper that is alternately folded and stored with perforations as creases has been conventionally known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-55946

In the present invention, as compared with the configuration in which the continuous paper having perforations to be conveyed with tension applied is always sandwiched between the first pinch roll and the second pinch roll and the tension applying roll, the continuous paper is conveyed. An object of the present invention is to obtain a transport device, an image forming device, and an image reading device capable of suppressing fluctuations in tension on a book paper.

In order to achieve the above object, the transport device according to claim 1 according to the present invention includes a first pinch roll that sandwiches and conveys a continuous book paper having perforations with a tension applying roll, and the first pinch roll. than pinch rolls disposed downstream in the conveyance direction of the continuous paper, a second pinch roll for transporting and held between the tensioning roll the continuous paper, the first pinch roll into the tensioning roll The first urging means for urging the second pinch roll, the second urging means for urging the second pinch roll toward the tension applying roll, and the perforations so as not to come into contact with the first pinch roll. At the timing when the perforation passes between the first pinch roll and the tension applying roll, the first pinch roll is temporarily released from the tension applying roll against the urging force of the first urging means. In accordance with the timing at which the perforation passes between the second pinch roll and the tension applying roll so that the perforation does not come into contact with the second pinch roll. It is provided with a second retracting means for temporarily retracting the second pinch roll from the tension applying roll against the urging force of the second urging means .

The transport device according to claim 2 is the transport device according to claim 1, wherein the pressure applied from the first pinch roll to the tension applying roll and the tension applied from the second pinch roll. The sum with the pressure applied to the roll is always constant.

Further, the transport device according to claim 3 is the transport device according to claim 2, and is added to the tension applying roll as the perforation approaches the first pinch roll. As the pressure of the first pinch roll is gradually reduced and the pressure of the second pinch roll is gradually increased and the perforation approaches the second pinch roll , the tension applying roll The pressure of the second pinch roll applied to the device is gradually reduced, and the pressure of the first pinch roll is gradually increased.

The transport device according to claim 4 is the transport device according to any one of claims 1 to 3, and the first evacuation means and the second evacuation means each have an eccentric cam. It is configured to include.

Further, the image forming apparatus according to claim 5 according to the present invention is based on the conveying device according to any one of claims 1 to 4, and the conveying device for conveying the continuous book paper having perforations. An image forming unit for forming an image on the continuous book paper to be conveyed is provided.

Further, the image reading device according to claim 6 according to the present invention is based on the transport device according to any one of claims 1 to 4, and the transport device for transporting the continuous paper having perforations. It is provided with an image reading unit that reads an image formed on the continuous paper to be conveyed.

According to the first aspect of the present invention, as compared with the configuration in which the continuous paper having perforations to be conveyed with tension applied is always sandwiched and conveyed between the first pinch roll and the second pinch roll and the tension applying roll. Therefore, it is possible to suppress fluctuations in tension of the continuously conveyed paper.

According to the invention of claim 2, the first pinch to the tension applying roll is compared with the configuration in which the sum of the pressures applied to the tension applying roll from the first pinch roll and the second pinch roll is not always constant. It is possible to suppress fluctuations in the tension applied to the continuous paper due to an increase or decrease in pressure due to the contact and detachment of the roll and the second pinch roll.

According to the invention of claim 3, as the perforation approaches the first pinch roll, the pressure of the first pinch roll applied to the tension applying roll is gradually reduced and the second pinch roll is applied. As the roll pressure is gradually increased and the perforations approach the second pinch roll, the pressure of the second pinch roll applied to the tensioning roll is gradually reduced and the first pinch roll is applied. Compared with the case where the pressure of the continuous paper is not gradually increased, it is possible to suppress the fluctuation of the tension of the continuous paper to be conveyed, and the continuous paper can be stably conveyed. ..

According to the invention of claim 4, the configurations of the first evacuation means and the second evacuation means are simplified as compared with the case where the first evacuation means and the second evacuation means are not configured to include the eccentric cams, respectively . can do.

According to the invention of claim 5, the image caused by the fluctuation of the tension of the continuously transported paper is compared with the case where the transport device according to any one of claims 1 to 4 is not provided. The occurrence of defects can be suppressed.

According to the invention of claim 6, the image caused by the change in the tension of the continuously conveyed paper is compared with the case where the transport device according to any one of claims 1 to 4 is not provided. It is possible to suppress the occurrence of reading defects.

It is a block diagram which shows the image forming apparatus which concerns on this embodiment. (A) It is a perspective view which shows the structure of the 1st pinch roll and the 2nd pinch roll side of the transport device which concerns on this embodiment. (B) It is a perspective view which shows the 1st pinch roll and the 2nd pinch roll which constitute the transport device which concerns on this Embodiment. (A) It is a perspective view which shows the structure of the coil spring side of the transport device which concerns on this embodiment. (B) It is a perspective view which shows the cam member which comprises the transport device which concerns on this Embodiment. It is explanatory drawing which shows the state before the sewing machine surface passes through the 1st pinch roll which constitutes the transfer apparatus which concerns on this embodiment. It is explanatory drawing which shows the state which the sewing machine surface starts to pass through the 1st pinch roll which constitutes the transfer apparatus which concerns on this embodiment. It is explanatory drawing which shows the state which the sewing machine surface is passing through the 1st pinch roll which constitutes the transfer apparatus which concerns on this embodiment. It is explanatory drawing which shows the state which the sewing machine surface has finished passing through the 1st pinch roll which constitutes the transfer apparatus which concerns on this embodiment. It is explanatory drawing which shows the state before the sewing machine surface passes through the 2nd pinch roll which constitutes the transfer apparatus which concerns on this embodiment. It is explanatory drawing which shows the state which the sewing machine surface is passing through the 2nd pinch roll which constitutes the transfer apparatus which concerns on this embodiment. It is a timing chart which shows the timing which the perforation passes through the 1st pinch roll and the 2nd pinch roll of the transfer apparatus which concerns on this embodiment. It is a block diagram which shows the image reading apparatus which concerns on this embodiment.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. For convenience of explanation, the arrow UP shown in each figure is the upward direction of the inkjet recording device 10 as an example of the image forming apparatus, and the front direction of the paper is the front direction of the inkjet recording device 10. Further, in the following, the transport direction of the continuous paper P having the perforation Pf (see FIG. 4) is simply referred to as the “transport direction”, and the upstream side in the transport direction and the downstream side in the transport direction are simply “upstream side”, respectively. Sometimes referred to as "downstream".

As shown in FIG. 1, the inkjet recording device 10 ejects ink droplets (droplets) onto the continuous paper P from an inkjet recording head 12 as an example of an image forming unit provided in the main body of the device. , An image is formed on the continuous paper P. More specifically, the inkjet recording head 12 is arranged in the order of black (K), cyan (C), magenta (M), and yellow (Y) from the upstream side at positions facing the continuous book paper P in the vertical direction. There is.

Each of the inkjet recording heads 12 has a width direction of the continuous book paper P in the longitudinal direction, and has a length equal to or larger than the paper width of the continuous book paper P. Then, each of the inkjet recording heads 12 ejects ink droplets of each color in order from above to the continuous book paper P which is conveyed in the image forming region 18A in the transfer path 18 described later, so that the continuous book paper P An image is formed on the surface.

The continuous paper P has perforations Pf (see FIG. 4) provided at predetermined intervals, and the continuous book paper P is alternately folded with the perforations Pf as creases and accommodated in the box-shaped accommodating portion 14. ing. Then, the continuous paper P is pulled out from the accommodating portion 14 by the conveying device 20, and while being conveyed along the conveying path 18, an image is formed on the surface of the continuous book paper P by each of the inkjet recording heads 12 as described above. It has become like.

The continuous paper P on which the image is formed is continuously conveyed along the transfer path 18 by the transfer device 20, and the perforation Pf is caused by the swing of the swing guide 15 arranged on the downstream side of the drive roll 26 described later. The folds are alternately folded and collected by the collection unit 16.

The transport device 20 is arranged with a plurality of transport rolls 22 that rotate with the front-rear direction as the axial direction, on the downstream side of the accommodating portion 14, and on the upstream side of the inkjet recording head 12, and the front-rear direction is the axial direction. A back tension roll 24 as an example of a tension applying roll that is rotated by being rotated, and a drive that is arranged on the downstream side of the inkjet recording head 12 and on the upstream side of the swing guide 15 and rotates with the front-rear direction as the axial direction. It has a roll 26 and.

The transport device 20 has thin plate-shaped guide members 28 for guiding the continuous paper P on the upstream and downstream sides of the back tension roll 24 and the downstream side of the drive roll 26. Therefore, at least the continuous paper P tensioned by the back tension roll 24 is formed by the plurality of transport rolls 22, the back tension roll 24, the drive roll 26, and the guide member 28 by the rotational driving force of the drive roll 26. It is configured to be transported along the transport path 18.

Further, the transport device 20 has a first pinch roll 30 that sandwiches the continuous book paper P with the outer peripheral surface of the back tension roll 24 (presses the continuous book paper P against the outer peripheral surface of the back tension roll 24) and conveys the continuous paper P. , A second pinch roll 50 arranged on the downstream side of the first pinch roll 30 is included. The first pinch roll 30 and the second pinch roll 50 are arranged symmetrically when viewed from the axial direction of the back tension roll 24, and their configurations are substantially the same.

First, the first pinch roll 30 will be described. As shown in FIG. 2, a plurality of first pinch rolls 30 arranged on the upstream side of the second pinch roll 50 are arranged in the axial direction with the axial direction of the back tension roll 24 as the rotation axis direction. It is composed of disk members of the same diameter. More specifically, the first pinch roll 30 is rotatably attached to one end 32A of the support member 32 formed in a substantially "L" shape when viewed from the axial direction of the back tension roll 24.

A cylindrical portion 32C (see FIG. 2B) is integrally formed at a bent portion (middle portion) bent at a substantially right angle of the support member 32, and each support member 32 penetrates the cylindrical portion 32C. By inserting the cylindrical shaft 34 into the hole 32D, it is configured to be rotatable around the shaft 34. Both ends of the shaft 34 in the axial direction are non-rotatably fixed to the bracket 38A of the spring suspension member 38 provided on the main body of the apparatus, which will be described later.

As shown in FIG. 3, one end 36A of the coil spring 36 as an example of the first urging means is attached to the other end 32B of the support member 32, and the other end 36B of the coil spring 36 is backed. It is attached to a substantially flat plate-shaped spring suspension member 38 extending in the axial direction of the tension roll 24. As a result, the first pinch roll 30 rotates about the shaft 34 and is urged toward the outer peripheral surface of the back tension roll 24.

Further, a support shaft 44 having a hexagonal cross section extending along the axial direction of the back tension roll 24 is provided adjacent to the shaft 34. A tubular cam member 42 having a hexagonal cross-section through hole 42A (see FIG. 3B) is fitted in the support shaft 44, and the cam member 42 cannot rotate with respect to the support shaft 44. It is fixed to. An eccentric cam 40 as an example of the first retracting means is integrally formed on the outer peripheral surface of the cam member 42.

Further, as shown in FIGS. 2 and 3, a driven gear 46 is fixed to one end of the support shaft 44, and a drive gear fixed to a rotating shaft (not shown) of the drive motor 48 (not shown). ) Are in mesh. Therefore, the rotational driving force of the drive motor 48 is transmitted from the drive gear to the driven gear 46, so that the support shaft 44 rotates and the eccentric cam 40 of the cam member 42 rotates in one direction.

The arm portion 33 is formed between the bent portion (cylindrical portion 32C) and the other end portion 32B of the support member 32, and the eccentric cam 40 of the cam member 42 is located in the axial direction of the shaft 34 (support shaft 44). , It is arranged at the same position as the arm portion 33 of the support member 32 (see also FIG. 4). As a result, the cam surface 40A of the eccentric cam 40 is configured to come into contact with the arm portion 33 and the spring suspension member 38 while rotating due to the urging force of the coil spring 36. Then, the pressure applied to the arm portion 33 and the spring suspension member 38 changes depending on the profile of the eccentric cam 40.

Next, the second pinch roll 50 will be described. As shown in FIG. 2, a plurality of second pinch rolls 50 arranged on the downstream side of the first pinch roll 30 are arranged in the axial direction with the axial direction of the back tension roll 24 as the rotation axis direction. It is composed of disk members of the same diameter. More specifically, the second pinch roll 50 is rotatably attached to one end 52A of the support member 52 formed in a substantially "L" shape when viewed from the axial direction of the back tension roll 24.

A cylindrical portion 52C (see FIG. 2B) is integrally formed at a bent portion (middle portion) bent at a substantially right angle of the support member 52, and each support member 52 penetrates the cylindrical portion 52C. By inserting the cylindrical shaft 54 into the hole 52D, it is configured to be rotatable around the shaft 54. Both ends of the shaft 54 in the axial direction are non-rotatably fixed to brackets 58A of a spring suspension member 58, which will be described later, provided in the main body of the apparatus.

As shown in FIG. 3, one end 56A of the coil spring 56 as an example of the second urging means is attached to the other end 52B of the support member 52, and the other end 56B of the coil spring 56 is backed. It is attached to a substantially flat plate-shaped spring suspension member 58 extending in the axial direction of the tension roll 24. As a result, the second pinch roll 50 rotates about the shaft 54 and is urged toward the outer peripheral surface of the back tension roll 24.

Further, a support shaft 64 having a hexagonal cross section extending along the axial direction of the back tension roll 24 is provided adjacent to the shaft 54. A tubular cam member 62 having a hexagonal cross-section through hole 62A (see FIG. 3B) is fitted in the support shaft 64, and the cam member 62 cannot rotate with respect to the support shaft 64. It is fixed to. An eccentric cam 60 as an example of the second retracting means is integrally formed on the outer peripheral surface of the cam member 62.

Further, as shown in FIGS. 2 and 3, a driven gear (not shown) is fixed to one end of the support shaft 64, and the driven gear 66 meshes with the driven gear. Then, the driven gear 46 of the first pinch roll 30 meshes with the driven gear 66. Therefore, the rotational driving force of the drive motor 48 is transmitted from the drive gear to the driven gear 46 and the driven gear 66, and further transmitted to the driven gear, so that the support shaft 64 rotates and the eccentric cam 60 of the cam member 62 is moved. It is configured to rotate in the same direction in synchronization with the eccentric cam 40.

The arm portion 53 is formed between the bent portion (cylindrical portion 52C) and the other end portion 52B of the support member 52, and the eccentric cam 60 of the cam member 62 is located in the axial direction of the shaft 54 (support shaft 64). , It is arranged at the same position as the arm portion 53 of the support member 52 (see also FIG. 4). As a result, the cam surface 60A of the eccentric cam 60 is configured to come into contact with the arm portion 53 and the spring suspension member 58 while rotating due to the urging force of the coil spring 56. The profile of the eccentric cam 60 changes the pressing force on the arm portion 53 and the spring suspension member 58.

As will be described later, the first pinch roll 30 and the second pinch roll 50 having the above configuration are rotationally driven by the drive motor 48 in accordance with the timing at which the perforations Pf of the continuous paper P pass. As a result, the coil springs 36 and 56 can be temporarily retracted from the outer peripheral surface of the back tension roll 24 with a time lag against the urging forces of the coil springs 36 and 56, respectively. Both the first pinch roll 30 and the second pinch roll 50 do not retract (separate) from the outer peripheral surface of the back tension roll 24.

Then, even when either one of the first pinch roll 30 and the second pinch roll 50 is temporarily retracted from the outer peripheral surface of the back tension roll 24, the other of the first pinch roll 30 and the second pinch roll 50 causes it. The pressure applied to the outer peripheral surface of the back tension roll 24 is the same as the pressure applied by both the first pinch roll 30 and the second pinch roll 50. That is, the sum of the pressures applied from the first pinch roll 30 and the second pinch roll 50 to the outer peripheral surface of the back tension roll 24 is always constant.

Further, the pressure of the first pinch roll 30 applied to the outer peripheral surface of the back tension roll 24 gradually decreases at the timing when the perforation Pf passes between the first pinch roll 30 and the back tension roll 24. The pressure of the second pinch roll 50 applied to the outer peripheral surface of the back tension roll 24 is gradually increased.

Then, the pressure of the second pinch roll 50 applied to the outer peripheral surface of the back tension roll 24 gradually decreases at the timing when the perforation Pf passes between the second pinch roll 50 and the back tension roll 24. The pressure of the first pinch roll 30 applied to the outer peripheral surface of the back tension roll 24 is gradually increased.

Next, the operation of the inkjet recording device 10 provided with the transfer device 20 having the above configuration will be described with reference to FIGS. 4 to 10. In FIGS. 4 to 9, the perforations Pf are exaggerated.

As shown in FIGS. 4 and 10, the normal positions where the cam surfaces 40A and 60A of the eccentric cams 40 and 60 of the cam members 42 and 62 are not in contact with the arm portions 33 and 53 and the spring suspension members 38 and 58. Then, the first pinch roll 30 and the second pinch roll 50 are both in contact with the outer peripheral surface of the back tension roll 24 by the urging force (normal urging force) of the coil springs 36 and 56. That is, the back tension roll 24, the first pinch roll 30, and the second pinch roll 50 sandwich and convey the continuous book paper P.

At this time, the urging force of the coil spring 36 of the first pinch roll 30 and the urging force of the coil spring 56 of the second pinch roll 50 are both equal. That is, if the pressure applied to the outer peripheral surface of the back tension roll 24 by the first pinch roll 30 is α and the pressure applied to the outer peripheral surface of the back tension roll 24 by the second pinch roll 50 is β, then α = β. The total pressure (sum of pressures) applied to the outer peripheral surface of the back tension roll 24 is α + β (= 2 × α = 2 × β).

Next, as shown in FIG. 5, when the perforation Pf of the continuous paper P approaches the first pinch roll 30, the drive motor 48 is rotationally driven, and the eccentric cam 40 is moved via the driven gear 46. Rotate. Then, the cam surface 40A of the eccentric cam 40 starts to gradually press the arm portion 33 in the direction of the arrow R1 against the urging force of the coil spring 36. As a result, the first pinch roll 30 gradually begins to separate from the outer peripheral surface of the back tension roll 24.

The intervals of the perforations Pf are set for each type of continuous paper P. Therefore, the timing at which the perforation Pf of the continuous paper P approaches the first pinch roll 30 or the second pinch roll 50, in other words, the timing at which the drive motor 48 is driven, determines the type of the continuous paper P. When the user inputs in advance to the control unit (not shown) of the inkjet recording device 10, the control unit automatically determines the determination.

On the other hand, when the drive motor 48 is rotationally driven, the eccentric cam 60 synchronizes with the eccentric cam 40 via the driven gear 66 that meshes with the driven gear 46 and the driven gear that meshes with the driven gear 66. Rotate in the direction. Then, the cam surface 60A of the eccentric cam 60 gradually starts pressing the spring suspension member 58 in the direction of arrow R2. As a result, the urging force of the coil spring 56 is gradually increased, and the pressing force of the second pinch roll 50 against the outer peripheral surface of the back tension roll 24 is gradually increased.

Subsequently, as shown in FIG. 6, when the drive motor 48 is further rotationally driven and the cam surface 40A of the eccentric cam 40 presses the arm portion 33 of the support member 32 to the maximum extent, the first pinch roll 30 backs up. It is completely separated from the outer peripheral surface of the tension roll 24. That is, the first pinch roll 30 is temporarily arranged at the retracted position shown in FIG.

As a result, the perforations Pf of the continuous paper P pass through without contacting the first pinch roll 30. Therefore, as compared with the case where the first pinch roll 30 is not configured to be temporarily retractable from the outer peripheral surface of the back tension roll 24 (configured to be in constant contact), the continuous book paper P to be conveyed , Fluctuations in tension (fluctuations in transport speed) due to catching of the perforation Pf on the first pinch roll 30 are suppressed or prevented, and the occurrence of image defects due to the fluctuations is suppressed or prevented.

On the other hand, along with this, the cam surface 60A of the eccentric cam 60 presses the spring suspension member 58 to the maximum, so that the urging force of the coil spring 56 is maximized, and the second pinch roll 50 presses the outer peripheral surface of the back tension roll 24. Press with maximum pressure. That is, the second pinch roll 50 is arranged at the maximum pressurization position shown in FIG.

Here, the pressure on the outer peripheral surface of the back tension roll 24 at the maximum pressurizing position of the second pinch roll 50 is set to be twice the pressure at the normal position. That is, the pressure applied to the outer peripheral surface of the back tension roll 24 by the second pinch roll 50 urged by the coil spring 56 at this time is 2 × β (= α + β). In other words, even when the outer peripheral surface of the back tension roll 24 is pressed only by the second pinch roll 50, the total pressure (sum of pressures) applied to the outer peripheral surface of the back tension roll 24 is α + β.

As described above, the total pressure (sum of pressures) applied to the outer peripheral surface of the back tension roll 24 by the first pinch roll 30 and the second pinch roll 50 is when the perforation Pf passes through the first pinch roll 30. But it is always constant. Therefore, as compared with the configuration in which the total pressure (sum of pressures) is not constant, the pressure is increased or decreased by the contact and detachment of the first pinch roll 30 with respect to the outer peripheral surface of the back tension roll 24, and the pressure is added to the continuous paper P. Fluctuations in tension are suppressed or prevented.

Further, the pressure of the first pinch roll 30 applied to the outer peripheral surface of the back tension roll 24 gradually decreases at the timing when the perforation Pf passes between the first pinch roll 30 and the back tension roll 24. The pressure of the second pinch roll 50 applied to the outer peripheral surface of the back tension roll 24 is gradually increased. Therefore, as compared with the case where the pressure is not gradually increased or decreased, the fluctuation of the tension of the continuously booked paper P to be conveyed is suppressed or prevented, and the continuously formed paper P is stably conveyed. ..

Next, as shown in FIG. 7, when the drive motor 48 is further rotationally driven, the eccentric cam 40 rotates, and the pressing force on which the cam surface 40A presses the arm portion 33 begins to be gradually reduced. Then, the first pinch roll 30 rotates in the direction of arrow R3 due to the urging force of the coil spring 36, and starts to come into contact with the outer peripheral surface of the back tension roll 24.

On the other hand, as the eccentric cam 40 rotates, the eccentric cam 60 rotates, and the pressing force on which the cam surface 60A presses the spring suspension member 58 begins to be gradually reduced. Then, the spring suspension member 58 rotates in the direction of arrow R4, and the pressing force of the second pinch roll 50 with respect to the outer peripheral surface of the back tension roll 24 begins to be gradually reduced. Then, as shown in FIG. 8, the first pinch roll 30 and the second pinch roll 50 are arranged again at the normal positions shown in FIG.

That is, the urging force of the coil spring 36 of the first pinch roll 30 and the urging force of the coil spring 56 of the second pinch roll 50 are equal again, and the outer circumference of the back tension roll 24 is equalized by the first pinch roll 30 and the second pinch roll 50. The total pressure (sum of pressures) applied to the surface is α + β (= 2 × α = 2 × β).

Further, when the drive motor 48 is rotationally driven and the cam surface 60A of the eccentric cam 60 presses the arm portion 53 of the support member 52 to the maximum, the second pinch roll 50 back tensions as shown in FIG. It is completely separated from the outer peripheral surface of the roll 24. That is, the second pinch roll 50 is temporarily arranged at the retracted position shown in FIG.

As a result, the perforations Pf of the continuous paper P pass through without contacting the second pinch roll 50. Therefore, as compared with the case where the second pinch roll 50 is not configured to be temporarily retractable from the outer peripheral surface of the back tension roll 24 (configured to be in constant contact), the continuous book paper P to be conveyed , Fluctuations in tension (fluctuations in transport speed) due to catching of the perforation Pf on the second pinch roll 50 are suppressed or prevented, and the occurrence of image defects due to the fluctuations is suppressed or prevented.

On the other hand, along with this, the cam surface 40A of the eccentric cam 40 presses the spring suspension member 38 to the maximum, so that the urging force of the coil spring 36 is maximized, and the first pinch roll 30 presses the outer peripheral surface of the back tension roll 24. Press with maximum pressure. That is, the first pinch roll 30 is arranged at the maximum pressurization position shown in FIG.

Here, the pressure on the outer peripheral surface of the back tension roll 24 at the maximum pressurizing position of the first pinch roll 30 is set to be twice the pressure at the normal position. That is, the pressure applied to the outer peripheral surface of the back tension roll 24 by the first pinch roll 30 urged by the coil spring 36 at this time is 2 × α (= α + β). In other words, even when the outer peripheral surface of the back tension roll 24 is pressed only by the first pinch roll 30, the total pressure (sum of pressures) applied to the outer peripheral surface of the back tension roll 24 is α + β.

As described above, the total pressure (sum of pressures) applied to the outer peripheral surface of the back tension roll 24 by the first pinch roll 30 and the second pinch roll 50 is when the perforation Pf passes through the second pinch roll 50. But it is always constant. Therefore, compared to the configuration in which the total pressure (sum of pressures) is not constant, the pressure is increased or decreased by the contact and detachment of the second pinch roll 50 with respect to the outer peripheral surface of the back tension roll 24, and the pressure is applied to the continuous paper P. Fluctuations in tension are suppressed or prevented.

Further, the pressure of the second pinch roll 50 applied to the outer peripheral surface of the back tension roll 24 gradually decreases at the timing when the perforation Pf passes between the second pinch roll 50 and the back tension roll 24. The pressure of the first pinch roll 30 applied to the outer peripheral surface of the back tension roll 24 is gradually increased. Therefore, as compared with the case where the pressure is not gradually increased or decreased, the fluctuation of the tension of the continuously booked paper P to be conveyed is suppressed or prevented, and the continuously formed paper P is stably conveyed. ..

After this state, when the drive motor 48 is further rotationally driven, the first pinch roll 30 and the second pinch roll 50 are arranged at the normal positions shown in FIG. 4, and the next perforation Pf is the second. 1 The continuous paper P is sandwiched between the outer peripheral surface of the back tension roll 24 and the continuous paper P until it approaches the pinch roll 30.

The transport device 20 according to the present embodiment has been described above with reference to the drawings, but the transport device 20 according to the present embodiment is not limited to the one shown in the drawing and does not deviate from the gist of the present invention. The design can be changed as appropriate. For example, the first evacuation means and the second evacuation means are not limited to those including the eccentric cams 40 and 60, and may be configured by an actuator (not shown) such as an air cylinder. However, if the first evacuation means and the second evacuation means are configured to include the eccentric cams 40 and 60, there is an advantage that the configurations are simplified.

Further, as shown in FIG. 1, a first pinch roll 30 and a second pinch roll 50 for sandwiching and transporting the continuous paper P may be provided at a position facing the drive roll 26. Also in this case, the first pinch roll 30 and the second pinch roll 50 are temporarily retracted from the outer peripheral surface of the drive roll 26 with a time lag in accordance with the timing at which the perforations Pf of the continuous paper P pass. It is configured to be possible. The drive roll 26 also applies tension to the continuous paper P. Therefore, the drive roll 26 is also an example of a tension applying roll.

Further, as shown in FIG. 11, the transport device 20 according to the present embodiment is an image reading device 70 provided with a scanner 68 as an example of an image reading unit in which the width direction of the continuous paper P is the longitudinal direction. Is also applicable. According to the image reading device 70 to which the conveying device 20 according to the present embodiment is applied, the occurrence of image reading defects of the scanner 68 due to the fluctuation of the tension of the conveyed continuous paper P is suppressed. Further, the transfer device 20 according to the present embodiment can also be applied to an image forming device 10 provided with an image reading device 70.

10 Inkjet recording device (an example of image forming device)
12 Inkjet recording head (an example of image forming unit)
20 Conveyor device 24 Back tension roll (an example of tension applying roll)
30 1st pinch roll 36 Coil spring (example of 1st urging means)
40 Eccentric cam (an example of the first evacuation means)
50 Second pinch roll 56 Coil spring (an example of second urging means)
60 Eccentric cam (example of second evacuation means)
68 Scanner (an example of image reader)
70 Image reader P Continuously printed paper Pf Perforation

Claims (6)

The first pinch roll that holds and conveys the perforated continuous paper between the tensioning rolls, and
A second pinch roll for conveying sandwiched between the first than the pinch rolls disposed at the conveying direction downstream side of the continuous paper, the tensioning roll the continuous paper,
The first urging means for urging the first pinch roll toward the tension applying roll, and
A second urging means for urging the second pinch roll toward the tension applying roll, and
The first pinch roll is attached to the first pinch roll at the timing when the perforation passes between the first pinch roll and the tension applying roll so that the perforation does not come into contact with the first pinch roll. A first evacuation means for temporarily retracting the tension applying roll against the urging force of the force means,
The second pinch roll is attached to the second pinch roll at the timing when the perforation passes between the second pinch roll and the tension applying roll so that the perforation does not come into contact with the second pinch roll. A second evacuation means for temporarily retracting the tension applying roll against the urging force of the force means,
Conveyor device equipped with. The transport according to claim 1, wherein the sum of the pressure applied from the first pinch roll to the tension applying roll and the pressure applied from the second pinch roll to the tension applying roll is always constant. apparatus. As the perforation approaches the first pinch roll, the pressure of the first pinch roll applied to the tension applying roll is gradually reduced, and the pressure of the second pinch roll is gradually reduced. Increased to
As the perforation approaches the second pinch roll, the pressure of the second pinch roll applied to the tension applying roll is gradually reduced, and the pressure of the first pinch roll is gradually reduced. The transport device according to claim 2, which is configured to be increased to. The transfer device according to any one of claims 1 to 3, wherein the first evacuation means and the second evacuation means each include an eccentric cam. The transport device according to any one of claims 1 to 4, which transports a continuous paper having a perforation.
An image forming unit that forms an image on the continuous paper transported by the transport device, and
An image forming apparatus equipped with. The transport device according to any one of claims 1 to 4, which transports a continuous paper having a perforation.
An image reading unit that reads an image formed on the continuous paper transported by the transport device, and
An image reader equipped with.

Images