JP2012121238A - Image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To identify whether image forming has been going on or finished, in paper, wherein the paper is held and conveyed on an outer peripheral surface of a carriage and, after an emergency stop instruction, left in an apparatus when a conveyance is resumed.SOLUTION: An image forming apparatus 100 includes: a paper feeding unit 10 and a paper standby unit 20; an image forming unit 40; a discharging unit 70 that discharges paper P applied image forming processing; a plurality of conveying drum that rotate by rotational driving force being transmitted each other and transfer and convey the paper P while holding it; and a control part 14 that stops a conveying operation when receiving the emergency stop instruction, conveys the paper P toward the discharging unit 70 if the paper P on which the image forming by the image forming unit 40 has not finished yet has still held on the conveying drum, prior to the resume of the image forming processing after the emergency stop instruction is clear, and stamps and discharges the held paper P.

Description

  The present invention relates to an image forming apparatus.

  As a conventional technique, it is an object to appropriately determine whether or not automatic discharge is possible for residual paper stopped near the flapper and improve usability by reducing operator intervention as much as possible. An image forming apparatus is known. In this image forming apparatus, the CPU ensures that the stop position of the leading edge of the recording medium when the door of the apparatus is opened, during an emergency stop, or when a jam occurs, the first section, the flapper in front of the flapper. Store in the non-volatile memory either in the second section that is passing, or in the third section that is between the first section and the second section and has not yet passed through the judgment flapper reliably. And determining whether the recording medium stopped on the conveyance path is in a state where automatic discharge is possible or is not possible based on the stored stop position of the leading end of the recording medium. (See Patent Document 1).

JP 2002-154744 A

  The present invention makes it possible to identify whether or not an image is being formed or completed with respect to a sheet that is held on the outer peripheral surface of a transport body and transported and left after restarting after an emergency stop instruction. For the purpose.

According to the first aspect of the present invention, a sheet standby / feeding unit that waits for a sheet and feeds the sheet in response to an instruction for an image forming process, and an image forming process that performs an image forming process on the sheet fed from the sheet standby / feeding unit. A discharge unit that discharges the sheet on which image forming processing has been performed by the image forming unit to the outside of the apparatus, and a sheet that has been fed out from the paper standby / feed-out unit from the discharge unit via the image forming unit. A plurality of transports that are arranged side by side in the paper transport direction until they are ejected, rotate by transmission of rotational driving force to each other, and are delivered and transported downstream in the paper transport direction while holding the paper on the outer peripheral surface The image forming unit stops the image forming process when an emergency stop instruction is received in a state where the sheet is transported while being held on the outer peripheral surface of the body and one of the plurality of transport bodies Both the operations of the plurality of conveyance bodies are stopped, and after the emergency stop instruction is canceled, the sheet on which image formation by the image forming unit has not been completed is left on the conveyance body as it is before the image forming process is resumed. A discharge control that starts the operations of the plurality of transport members when held and transports the paper toward the discharge unit, and adds a mark to the held paper and discharges the paper from the discharge unit. And an image forming apparatus.
According to a second aspect of the present invention, the discharge control unit is configured to detect a sheet that has not been fed out from the paper standby / feeding unit or that has been fed out from the paper standby / feeding unit but has not reached the image forming unit. 2. The image forming apparatus according to claim 1, wherein the mark is not added.
According to a third aspect of the present invention, the discharge control unit discharges a sheet in which image formation by the image forming unit has been completed but the entire sheet is not discharged from the discharge unit without adding the mark. The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus.
According to a fourth aspect of the present invention, the sheet standby / feed-out unit waits for a sheet having a sheet size of at least one of Kikuhan, Shikoku, A, and B, and an image forming process. The image forming apparatus according to claim 1, wherein the sheet is fed out in response to the instruction.
According to a fifth aspect of the present invention, the paper standby / feed-out unit is provided with a storage unit that stores paper, and is provided downstream of the storage unit in the paper transport direction and receives the paper fed out from the storage unit. A first paper standby / feeding unit, and a sheet that is provided downstream from the first paper standby / feeding unit in the paper transport direction and that is fed one by one from the first paper standby / feeding unit. A second paper standby / feeding unit for receiving the paper, and the discharge control unit, after the emergency stop instruction is canceled, prior to restarting the image forming process, the first paper standby / feeding unit. 5. The image forming apparatus according to claim 1, wherein the waiting sheet is fed to the second sheet waiting / feeding unit. 6.
According to a sixth aspect of the present invention, the paper standby / feed-out unit is provided on the downstream side in the paper transport direction with respect to the storage unit for storing the paper, and stacks the paper fed out from the storage unit. 6. The image forming apparatus according to claim 1, further comprising: a stacking surface to be stacked; and a stacking surface feeding unit that feeds the sheets stacked on the stacking surface to the conveyance body.

According to the first aspect of the present invention, whether or not an image is being formed or has been completed with respect to a sheet that is held on the outer peripheral surface of the transport body and is transported and left after restarting after an emergency stop instruction. Can be identified.
According to the second aspect of the present invention, it is possible to more easily identify the paper that has reached the image forming unit when the emergency stop is performed, as compared with the case where this configuration is not provided.
According to the third aspect of the present invention, compared to a case where the present configuration is not provided, it is possible to discharge a sheet on which image formation has been completed when an emergency stop is performed without adding a mark.
According to the invention described in claim 4, for example, the Kikuhan, Yakushima, A half, etc., which were held in the outer peripheral surface of the carrier and were left inside the apparatus when restarted after an emergency stop instruction, It is possible to identify whether paper is in the middle of image formation or has been completed for papers that are larger than normal size papers such as A4, A3, and B4 used in general offices such as B size .
According to the fifth aspect of the present invention, the user can more reliably omit the work of removing the paper in the first paper standby / feed-out section, compared with the case where the present configuration is not provided.
According to the sixth aspect of the present invention, the workability of the user for taking out the paper from the paper standby / feeding unit is further improved as compared with the case where the present configuration is not provided.

1 is a schematic configuration diagram illustrating an image forming apparatus to which the exemplary embodiment is applied. FIG. 3 is a diagram for explaining a drive system of the image forming apparatus. It is a figure for demonstrating holding | maintenance and delivery of a paper. It is a perspective view of a stamper and a stamper periphery. It is a perspective view of a stamper. 6 is a flowchart illustrating control performed by a control unit of an emergency stop image forming apparatus to which the exemplary embodiment is applied. 10 is a flowchart for explaining control performed by a control unit of the image forming apparatus that has undergone an emergency stop in a second mode. 10 is a flowchart illustrating control performed by a control unit of an image forming apparatus that has been urgently stopped in a third mode.

Hereinafter, this embodiment will be described in detail with reference to the accompanying drawings.
<Image forming apparatus 100>
FIG. 1 is a schematic configuration diagram illustrating an image forming apparatus 100 to which the exemplary embodiment is applied. In FIG. 1, the conveyance direction of the paper P is indicated by an arrow S, and the rotation direction of each conveyance drum is indicated by an arrow K.

  As shown in FIG. 1, in the image forming apparatus 100, a plurality of processing units are arranged side by side along the conveyance direction of the paper P (see arrow S). Each processing unit is an example of a transport body, and includes two cylindrical transport drums (thick drums). In the present embodiment, each transport drum is configured with the same dimensions (diameter, length, etc.). The paper P is held on the outer peripheral surface of the transport drum, and the paper P is sequentially transferred to and transported to the downstream transport drum (details will be described later).

  Specifically, in order from the upstream side in the transport direction, the paper feed unit 10, the paper standby unit 20, the preprocessing unit 30, the image forming unit 40, the drying unit 50, the fixing inspection unit 60, and the discharge unit. 70.

  Here, the paper feeding unit 10 stacks and stores the paper P and feeds the stored paper P. The paper standby unit 20 receives and holds the paper fed from the paper feeding unit 10 and sends it further downstream. The pretreatment unit 30 performs pretreatment by applying a treatment liquid to a recording surface PA (described later) of the paper P. The image forming unit 40 forms an image on a recording surface PA (described later) of the preprocessed paper P. The drying unit 50 dries an image formed on a recording surface PA (described later) of the paper P. The fixing inspection unit 60 fixes the dried image on the paper P and inspects the fixed image. The discharge unit 70 discharges the paper P on which the image is fixed and stacks and stores the discharged paper P.

Each processing unit has a sensor (not shown) that detects the presence or absence of paper P in each processing unit and a jam (paper jam) in each processing unit.
In addition, the image forming apparatus 100 is an A4 used in a general office such as a chrysanthemum half (636 x 469 mm), a four quarters (545 x 394 mm), an A half half (625 x 440 mm), or a B half four (542 x 382 mm). , A3, B4, etc., an image is formed on a large paper that is larger than a normal size paper. Other examples of large paper on which the image forming apparatus 100 forms an image include Text Common Size (635 × 482.6 mm), Cover Common size (660 × 508 mm), 640 × 450 mm, and 720 × 520 mm.
Hereinafter, each processing unit will be described in detail.

<Paper Feed Unit 10>
A paper feeding unit 10 which is an example of a paper standby / feeding unit is provided with a storage unit 12 on which paper P is stacked and stored. A feeder board 15 (first paper standby / feed-out unit) is connected to the downstream side of the storage unit 12 in the transport direction (see arrow S). The paper P stored in the storage unit 12 is configured to be fed onto the feeder board 15 one by one or a plurality of sheets by a roll unit (not shown). Here, a maximum of four sheets P are stacked on the stacking surface on the feeder board 15 of the present embodiment. The paper P fed to the feeder board 15 is configured to be fed one by one to the paper standby unit 20 by the vacuum head 17 (suction unit).
The paper feed unit 10 is provided with a drive motor 16. In other words, the drive motor 16 rotationally drives the transport drum of each processing unit (details will be described later).

  Here, the sheet feeding unit 10 is provided with a control unit 14 that controls the entire image forming apparatus 100. The control unit 14 is provided with a control circuit (not shown) configured to include, for example, a CPU (Central Process Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. Various programs and various information (various data) are stored in advance in the ROM. The control unit 14 and each processing unit are connected by a communication network (not shown) and can exchange information with each other. The control unit 14 controls each processing unit by transmitting a command to each processing unit via a communication network.

<Paper standby unit 20>
The paper standby unit 20, which is an example of a paper standby / feeding unit, is provided with a delivery transport drum 120 and a standby transport drum 122 (second paper standby / feeding unit) rotatably. The paper P fed one by one from the feeder board 15 is fed to the surface (circumferential surface) of the standby transport drum 122 via the delivery transport drum 120.

<Pretreatment unit 30>
In the preprocessing unit 30, a delivery transport drum 130 and a pretreatment transport drum 132 are rotatably provided. Above the pretreatment transport drum 132, a treatment liquid coating is applied to the outer peripheral surface 132A of the pretreatment transport drum 132 with the rotational axis direction of the pretreatment transport drum 132 being the longitudinal direction. A device 32 is provided.

<Image forming unit 40>
An image forming unit 40 that is an example of an image forming unit is provided with a delivery transport drum 140 and an image formation transport drum 142 that are rotatable.
An ink jet device 44 is provided above the image forming conveyance drum 142. The ink jet device 44 includes ink jet recording heads 42Y, 42M, 42C, and 42K corresponding to the respective colors of yellow (Y), magenta (M), cyan (C), and black (K).
In the following description, when distinguishing yellow (Y), magenta (M), cyan (C), and black (K), Y, M, C, and K are added after the reference numerals to particularly distinguish them. When not necessary, Y, M, C, and K after the code are omitted.

The nozzle surfaces 42YA, 42MA, 42CA, and 42KA of the ink jet recording head 42 have an image forming area (ink droplets) that is equal to or larger than the maximum width (width in the main scanning direction) of the paper P on which an image is formed. Discharge region).
The respective ink jet recording heads 42Y, 42M, 42C, and 42K are arranged with the rotation axis direction (main scanning direction) of the image forming transport drum 142 as the longitudinal direction, and are arranged side by side along the circumferential direction. The nozzle surface 42 </ b> A of the inkjet recording head 42 is disposed toward the outer peripheral surface 142 </ b> A of the image forming conveyance drum 142. A plurality of nozzles (not shown) are formed on the nozzle surface 42A, and ink droplets TY, TM, TC, TK are generated from the nozzles (not shown) by known means such as a thermal method or a piezoelectric method. (See FIG. 3). A color image is formed when the ink droplet T lands on the recording surface PA of the paper P.

The ink jet device 44 is provided with ink tanks (not shown) for replenishing the ink jet recording heads 42Y, 42M, 42C, and 42K with the respective color inks.
In other words, the treatment liquid applied to the recording surface PA of the paper P in the pretreatment unit 30 described above aggregates due to the reaction of the color material (pigment) dispersed in the ink, and the color material and the solvent. Has the effect of promoting separation. Therefore, when the ink droplet T (see FIG. 3) lands, an aggregate is formed so that a color material flow or the like does not occur on the recording surface PA of the paper P.

<Drying unit 50>
In the drying unit 50, a delivery transport drum 150 and an ink drying transport drum 152 are rotatably provided. Above the ink drying transport drum 152, a hot air nozzle 52 and an infrared heater 54 are provided toward the outer peripheral surface 152A.

<Fixing inspection unit 60>
The fixing inspection unit 60 is provided with a delivery conveying drum 160 and a fixing inspection conveying drum 162 that are rotatable. The fixing inspection unit 60 is provided with a fixing roll 62 that is in pressure contact with the outer peripheral surface 162 A of the fixing inspection transport drum 162. The fixing roll 62 is supported by the support portion 65 and is driven to rotate as the fixing inspection transport drum 162 rotates. The sheet P is sandwiched and transported between the fixing roll 62 and the outer peripheral surface 162A of the fixing inspection transport drum 162 (nip portion).

  Further, on the downstream side of the conveyance direction (rotation direction) of the fixing roll 62, an image reading sensor 68 is provided that is disposed toward the outer peripheral surface 162A of the conveyance drum 162 for fixing inspection with the rotation axis direction as the longitudinal direction. Yes. The image reading sensor 68 reads an image fixed on the paper P passing under the image reading sensor 68 and sends the read data to the control unit 14.

  Further, the fixing inspection transport drum 162 is provided with an electromagnetic powder brake 200. The conveyance roller 162 for fixing inspection is configured to rotate at a predetermined number of rotations while a predetermined load (rotational resistance) is applied by the powder brake 200.

<Discharge unit 70>
A delivery transport drum 72 is rotatably provided in a delivery unit 70 that is an example of a delivery unit. A delivery chain provided between the sprockets 77 and 78 and provided with a plurality of delivery grippers (not shown) on the downstream side in the transport direction of the delivery transport drum 72 (see arrow S). 79. Further, a paper discharge container 71 is provided on the downstream side in the transport direction of the paper discharge chain 79 (see arrow S). Further, between the sprockets 77 and 78, a paper discharge guide board 74 which is a plate-like member for guiding the paper P held by a paper discharge gripper (not shown) of the paper discharge chain 79 is connected. Yes.
The paper discharge guide board 74 is provided with a stamper 76 (details will be described later) for marking the conveyed paper P.

<Drive system>
Next, the drive system of the image forming apparatus 100 will be described with reference to FIG. Since the drive systems of the respective transport drums have the same configuration, the description will be made using the transport drums 120, 122, and 130 here. Here, FIG. 2 is a diagram for explaining a drive system of the image forming apparatus 100.
As shown in FIG. 2, gears 121, 123, and 131 that transmit driving force are provided at one end of the transport drums 120, 122, and 130 in the direction of the rotation axis (end on the back side in FIG. 1). It has been. And these gears 121, 123, 131 are meshed with each other, and the rotational driving force is transmitted.
A pulley 124 is provided coaxially with the gear 121 of the transfer drum 120 for delivery. A belt 138 is wound around the pulley 124 and a pulley 136 provided on the rotation shaft of the drive motor 16.

Here, the operation of the drive system of the image forming apparatus 100 will be described.
When the rotation shaft of the drive motor 16 rotates, the rotational driving force is transmitted through the pulleys 136 and 124 and the belt 138, and the delivery transport drum 120 rotates. When the delivery transport drum 120 rotates, the rotational driving force is transmitted by the gears 121, 123, and 131 described above, and the standby transport drum 122 and the delivery transport drum 130 rotate.

Similarly, the transport drums 142, 152, 162 installed on the downstream side of the transfer transport drum 130 in the transport direction (see the arrow S) are also one end in the rotation axis direction (the back side of the paper surface in FIG. 1). (End portion) has a gear, and a rotational driving force is transmitted to rotate. Further, since the gears of the respective transport drums have the same size and the same number of teeth, the respective transport drums rotate at the same rotational speed.
Further, as described above, a load is applied to the fixing inspection transport drum 162 by the powder brake 200, but the rotational driving force applied by the drive motor 16 is larger than this load, and thus each transport drum 142 is driven. , 152, 162 rotate at a predetermined number of rotations.
For the sake of clarity, the illustration of gears is omitted except for FIG.

<Delivery of paper P>
Next, the conveyance system of the paper P, that is, the mechanism in which the outer peripheral surface of each conveyance drum holds the paper P and the delivery of the paper P to the downstream conveyance drum in the conveyance direction will be described with reference to FIG. Here, FIG. 3 is a diagram for explaining the holding and delivery of the paper P. FIG.
Each of the transport drums is configured in the same manner, and therefore, the transport drums 140, 142, and 150 will be illustrated and described as representatives.

As shown in FIG. 3, the outer circumferential surfaces 140A, 142A, and 150A of the transport drums 140, 142, and 150 have concave grooves 140D and 140F, concave grooves 142D and 142F, and concave grooves 150D and 150F whose longitudinal direction is the rotation axis direction. Is formed. The concave groove 140D and the concave groove 140F are formed at positions facing each other across the rotation axis (circular center). Similarly, the concave groove 142D and the concave groove 142F are opposed to each other, and the concave groove 150D and the concave groove 150F are opposed to each other.
In the concave grooves 140D and 140F, the concave grooves 142D and 142F, and the concave grooves 150D and 150F, a gripper rotation shaft 252 arranged in a direction along the rotation axis direction is provided. A gripper 250 is fixed to the gripper rotating shaft 252.

  Then, when the gripper rotating shaft 252 is rotated in both forward and reverse directions by an actuator (not shown), the gripper 250 is rotated in both forward and reverse directions along the circumferential direction of the transport drums 140, 142, 150. As a result, the gripper 250 opens and closes, and as a result, the leading end in the transport direction of the paper P can be held and released.

Further, as shown in FIG. 3, the sheet P can be delivered at a delivery position where the outer peripheral surface 140A of the delivery transport drum 140 and the outer peripheral surface 142A of the image forming transport drum 142 face each other. Yes. Specifically, at this delivery position, the paper P is delivered from the gripper 250 of the delivery transport drum 140 to the gripper 250 of the image forming transport drum 142.
Similarly, from the gripper 250 of the image forming transport drum 142 to the gripper 250 of the transfer transport drum 150 at the transfer position where the outer peripheral surface 142A of the image forming transport drum 142 and the outer peripheral surface 150A of the transfer transport drum 150 face each other. And paper P are delivered.
For the sake of clarity, the grooves and grippers are not shown except for FIG.

<Stamper 76>
Next, the stamper 76 will be described with reference to FIGS. 4 and 5. Here, FIG. 4 is a perspective view of the stamper 76 and the periphery of the stamper 76, and FIG. 5 is a perspective view of the stamper 76. In FIG. 4, the paper discharge chain 79 is not shown for the sake of clarity.

First, as shown in FIG. 4, the stamper 76 is provided below the paper discharge guide board 74. Specifically, the stamper 76 is provided on a support portion 761 fixed below the paper discharge guide board 74. The paper discharge guide board 74 is provided with a through hole 741, and a part of the stamper 76 passes through the through hole 741.
The stamper 76 is provided so as to be able to advance and retreat with respect to a conveyance path S1 (see FIG. 4) along which the paper P delivered from the delivery conveyance drum 72 is conveyed along the paper discharge guide board 74. .

  As shown in FIG. 5, the stamper 76 includes a stamp head 762 for applying a stamp (mark) with ink to the front end of the paper P (see FIG. 1) conveyed on the conveyance path S <b> 1 (see FIG. 4). Further, the stamper 76 includes a solenoid 765 that is connected to the opposite side of the stamp head 762 across the support point 764 and moves the stamp head 762.

Next, the operation of the stamper 76 will be described with reference to FIG.
When the solenoid 765 is switched on and off, the stamp head 762 moves between a position where the stamp head 762 protrudes from the transport path S1 of the paper P (see FIG. 4) and a position where the stamp P is retracted from the transport path S1 of the paper P. .

Specifically, when the solenoid 765 is switched from the on state to the off state, the head portion (not shown) of the solenoid 765 is immersed (see arrow E). Along with the movement of the head portion, the stamp head 762 moves along the arrow F, and the stamp head 762 is disposed at a position on the conveyance path S1 (see FIG. 4) of the paper P, that is, at a position where the conveyance of the paper P is blocked. The
On the other hand, when the solenoid 765 is switched from the off state to the on state, the head portion of the solenoid 765 protrudes (see arrow D), and the stamp head 762 moves along the arrow G. The stamp head 762 is disposed at a position retracted from the transport path S1 of the paper P.

  Here, when the sheet P is conveyed in a state where the solenoid 765 is on and the stamp head 762 is disposed at a position on the conveyance path S1 of the sheet P, the conveyance direction of the sheet P (arrow S in FIG. 1). The tip at (see) contacts the stamp head 762. By this contact, a mark (stamp) is attached to the front end of the paper P. Then, after the leading edge of the paper P and the stamp head 762 contact each other, the solenoid 765 is switched from the on state to the off state, and the stamp head 762 moves along the arrow G. As a result, the stamp head 762 moves to a position retracted from the transport path S1 of the paper P and suppresses marking of portions other than the front end of the paper P.

<Operation of Image Forming Apparatus 100>
Here, the operation of the image forming apparatus 100 will be described with reference to FIG.
When the image forming apparatus 100 starts an image forming operation, a roll unit (not shown) of the paper feeding unit 10 rotates, so that one or more sheets are fed from the housing unit 12 of the paper feeding unit 10 to the feeder board 15. P is sent out. The fed paper P is sent to the delivery drum 120 for delivery one by one by a vacuum head 17 which is an example of a stacking surface feeding unit. The paper P sent to the delivery transport drum 120 is delivered to the standby transport drum 122.
The paper P held on the standby conveyance drum 122 is delivered to the pretreatment conveyance drum 132 via the delivery conveyance drum 130 after receiving an instruction from the control unit 14.

The processing liquid is applied to the recording surface PA (see FIG. 3) of the paper P by the processing liquid applying device 32 on the paper P held on the preprocessing transport drum 132.
The sheet P coated with the treatment liquid is transferred from the preprocessing transfer drum 132 to the image forming transfer drum 142 via the transfer transfer drum 140. Ink is ejected from the inkjet recording heads 42Y, 42M, 42C, and 42K to the paper P held on the image forming conveyance drum 142 in accordance with input data. When the ink droplets T (see FIG. 3) land on the paper P coated with the treatment liquid, aggregates are formed and the color material movement is suppressed.

  Then, the paper P onto which the ink has been ejected is transferred from the image forming transport drum 142 to the ink drying transport drum 152 via the transfer transport drum 150. The paper P held on the ink drying transport drum 152 is heated by the hot air nozzle 52 and the infrared heater 54. As a result, the solvent in the ink separated by the color material aggregating action of the treatment liquid on the recording surface PA of the paper P is dried, and a thin image layer is formed. As a result, curling of the paper P is prevented and image quality deterioration due to the solvent component is suppressed.

The dried paper P is transferred from the ink drying transfer drum 152 to the fixing inspection transfer drum 162 via the transfer transfer drum 160. The sheet P held on the fixing inspection transport drum 162 passes through the nip portion between the fixing roll 62 and the outer peripheral surface 162A of the fixing inspection transport drum 162, whereby the image formed on the sheet P is fixed. To settle.
Further, the sheet P held on the fixing inspection transport drum 162 is read by the image reading sensor 68 provided on the downstream side in the transport direction (rotation direction) of the fixing roll 62. The read information read is sent to the control unit 14 and analyzed to check whether there is any abnormality. If there is an abnormality in the image, the control unit 14 issues a warning to, for example, a user interface (not shown).

  The sheet P on which the image is formed in this manner is transferred from the fixing inspection transport drum 162 to the paper discharge chain 79 through the transfer transport drum 72. The paper P held by the paper discharge gripper (not shown) of the paper discharge chain 79 is conveyed along the upper surface of the paper discharge guide board 74 and then stored in the paper discharge storage portion 71.

<Emergency stop of image forming apparatus 100>
<First aspect>
Now, when an image is formed on the paper P by the image forming apparatus 100, for example, when a malfunction (system failure) of the image forming apparatus 100 such as a jam (paper jam) is detected or due to the convenience of the user, the image forming apparatus. 100 may be emergency stopped (hard shutdown). For example, the emergency stop of the image forming apparatus 100 discharges the paper P remaining in the image forming apparatus 100 toward the paper discharge accommodating portion 71 of the discharge unit 70 (purge process) as a predetermined operation. Then, the image forming operation is restarted. In addition, when performing the purge process, for example, image formation on the paper P is not performed in the image forming unit 40 or the like. In this embodiment, the paper P discharged by the purge process is not a reprint target.

  Here, the control of the control unit 14 performed when the image forming apparatus 100 that has stopped urgently restarts the image forming process will be described with reference to FIGS. 1 and 6. FIG. 6 is a flowchart illustrating the control performed by the control unit 14 of the image forming apparatus 100 that has been urgently stopped.

  First, for example, when a jam (paper jam) occurs while the image forming apparatus 100 is performing an image forming operation, a sensor (not shown) of the processing unit in which the jam has occurred detects the jam, and the controller 14 Send emergency stop instructions. Receiving the emergency stop instruction, the control unit 14 (S101) issues an instruction to stop each transport drum (S102). Furthermore, the control unit 14 displays that an emergency stop has been performed on a user interface (not shown) (S103).

Next, the control part 14 receives the instruction | indication which performs the purge process made by the user's operation via a user interface (not shown) (S104). At this time, a user interface (not shown) may display, for example, “paper remains in the main body. Press the“ paper ejection ”button”. This display prompts the user's operation.
Then, the control unit 14 that has received the instruction to perform the purge process determines whether or not the jammed paper P (jamming paper) remains in each processing unit (S105). Here, the control unit 14 determines whether or not the jammed paper remains depending on whether or not each sensor provided in each processing unit detects the jammed paper.

If an affirmative determination (Yes) is made in S105, that is, if it is determined that jammed paper is present, the control unit 14 displays that the jammed paper remains on the user interface (not shown). Then, the jammed paper is removed by the user (S106). Thereafter, the control unit 14 again receives an instruction to perform the purge process performed by the user's operation via a user interface (not shown) (S104).
On the other hand, if a negative determination (No) is made in S105, that is, if it is determined that there is no jammed paper, the control unit 14 determines whether or not the paper P remains in each processing unit. Judgment is made (S107). Here, the control unit 14 determines whether or not the paper P remains depending on whether or not each sensor provided in each processing unit detects the paper P (scratch paper) remaining in each processing unit. .

If an affirmative determination (Yes) is made in S107, the scratch paper is conveyed by the control unit 14 issuing an instruction (S108). Specifically, the control unit 14 drives the drive motor 16 to rotate each transport drum. Each rotating transport drum transports the scratch paper downstream in the transport direction (see arrow S in FIG. 1), and discharges the scratch paper to the paper discharge storage portion 71 of the discharge unit 70. When the scratch paper is conveyed, a stamp is applied by the stamper 76 to indicate that the paper P is a scratch paper (S109). Specifically, when the scratch paper passes above the stamper 76 of the discharge unit 70, the stamper 76 stamps the leading end of the scratch paper in the conveyance direction. When all the scratch sheets are arranged outside the image forming apparatus 100, that is, in the paper discharge accommodating section 71, the control section 14 instructs each processing unit, and the image forming apparatus 100 instructs the next image formation. (S110).
On the other hand, when a negative determination (No) is made in S107, the control unit 14 issues an instruction to each processing unit, and the image forming apparatus 100 enters a standby state waiting for an instruction for the next image formation (S110). .

  In other words, in the present embodiment, the paper discharge accommodating portion 71 can also store paper P (normal paper) on which normal image formation has been performed, but since the scratch paper is stamped, it is normal paper. And scratch paper are identified.

  Further, the image forming apparatus 100 discharges the paper P (purge process), thereby eliminating the need for the user to remove the paper P remaining in the image forming apparatus 100. In particular, when the paper P having a size larger than that of a normal size paper used in a general office is used, the convenience for the user is particularly increased. Further, when the user removes the paper P manually, if the paper P having a large size is used, unevenness or folding may occur, and there is a case where the resetting for re-forming the image is restricted. . Therefore, the image forming apparatus 100 also prevents the resetting of the removed paper P from being restricted.

  Note that, unlike the emergency stop, when the image forming apparatus 100 stops due to a cycle down, the image forming apparatus 100 may be configured to discharge the transportable paper P outside the apparatus while continuing printing. In this case, the user removes the paper P that can be transported. Then, for example, the subsequent paper P may be discharged out of the apparatus by a cycle up purge operation.

  Further, in S103, the control unit 14 may display, for example, the occurrence of a jam on the user interface (not shown), and at the same time, display the animation of the coping method and the release procedure. This display prompts the user to remove the jammed paper. Note that “confirm” displayed on the user face (not shown) may be pressed by the user after the jammed paper is removed. At this time, the above-described control unit 14 determines whether or not the jammed paper P (jam-causing paper) remains in each processing unit (S105), and an affirmative determination in S105 (Yes) ) Is displayed on the user interface (not shown), it is displayed that the jammed paper remains, and the user removes the jammed paper (S106) by the user's operation. The instruction to perform the purge process is performed before the step (S104) in which the control unit 14 receives the instruction via the user interface (not shown).

<Second aspect>
Next, as a second mode, a mode in which some stamps 76 are not stamped by the stamper 76 among the scratched papers existing in the transport path of the paper P in the emergency stop image forming apparatus 100 will be described.
Here, the control of the control unit 14 performed when the image forming apparatus 100 that has been urgently stopped in the second mode restarts the image forming process will be described with reference to FIGS. 1 and 7. FIG. 7 is a flowchart illustrating the control performed by the control unit 14 of the image forming apparatus 100 that has been urgently stopped in the second mode.

  First, for example, when a jam (paper jam) occurs while the image forming apparatus 100 is performing an image forming operation, a sensor (not shown) of the processing unit in which the jam has occurred detects the jam, and the controller 14 Send emergency stop instructions. Upon receiving the emergency stop instruction, the control unit 14 (S201) issues an instruction to stop each transport drum (S202). Furthermore, the control unit 14 displays that an emergency stop has been performed on a user interface (not shown) (S203).

  Next, the control part 14 receives the instruction | indication which performs the purge process made by the user's operation via a user interface (not shown) (S204). Receiving the instruction to perform the purge process, the control unit 14 determines whether or not the jammed paper P (jamming paper) remains in each processing unit (S205). Here, the control unit 14 determines whether or not the jammed paper remains depending on whether or not each sensor provided in each processing unit detects the jammed paper.

If an affirmative determination (Yes) is made in S205, that is, if it is determined that jammed paper is present, the control unit 14 displays that the jammed paper remains on the user interface (not shown). Then, the jammed paper is removed by the user (S206). Thereafter, the control unit 14 again receives an instruction to perform the purge process performed by the user's operation via a user interface (not shown) (S204).
On the other hand, if a negative determination (No) is made in S205, that is, if it is determined that there is no jammed paper, the control unit 14 determines whether or not the paper P remains in each processing unit. (S207). Here, the control unit 14 determines whether or not the paper P remains depending on whether or not each sensor provided in each processing unit detects the paper P (scratch paper) remaining in each processing unit. .

  If the determination in step S207 is affirmative (Yes), that is, if it is determined that a scratch sheet exists, the control unit 14 determines whether the image forming process applied to the scratch sheet is incomplete. (S208). Specifically, when the emergency stop is performed, the image forming apparatus 100 is disposed in the paper feeding unit 10, the paper standby unit 20, the preprocessing unit 30, the image forming unit 40, the drying unit 50, and the fixing inspection unit 60. For the paper P that is present, the control unit 14 determines that the image forming process has not been completed (Yes). On the other hand, the control unit 14 determines that the image forming process is not incomplete for the paper P disposed in the discharge unit 70 when the emergency stop is performed (No).

  If an affirmative determination (Yes) is made in S208, the control unit 14 issues an instruction, and the scratch paper is conveyed (S209). Specifically, the control unit 14 drives the drive motor 16 to rotate each transport drum. Each rotating transport drum transports the scratch paper to the downstream side in the transport direction (see arrow S in FIG. 1), and discharges the scratch paper to the paper discharge container 71 of the discharge unit 70. Further, when the scratch paper is conveyed, a stamp is applied by the stamper 76 to indicate that the image forming process for the paper P is incomplete (S211). When all the scratch sheets are arranged outside the image forming apparatus 100, that is, in the paper discharge accommodating section 71, the control section 14 instructs each processing unit, and the image forming apparatus 100 instructs the next image formation. (S212).

  On the other hand, if a negative determination (No) is made in S208, the control unit 14 issues an instruction to transport the scratch paper (S210). When all the scratch papers are placed in the paper discharge accommodating portion 71, the image forming apparatus 100 enters a standby state waiting for a next image forming instruction (S212).

  When a negative determination (No) is made in S207, the control unit 14 issues an instruction to each processing unit, and the image forming apparatus 100 enters a standby state waiting for an instruction for the next image formation (S212).

  In S208 of the present embodiment, the control unit 14 determines whether or not the image forming process performed on the scratch paper is incomplete, but the present invention is not limited to this. For example, it may be determined whether or not image forming processing is further performed. Specifically, the control unit 14 determines that the image forming process is not performed on the paper P disposed in the paper supply unit 10 and the paper standby unit 20 when the emergency stop is performed. Then, when the paper P arranged in the paper supply unit 10 and the paper standby unit 20 is transported downstream in the transport direction (see arrow S in FIG. 1), the stamper 76 does not put a stamp. May be.

<Third Aspect>
Next, as a third mode, when an emergency stop is performed, the paper P placed on the feeder board 15 of the paper feeding unit 10 is in a standby state after being sent downstream in the transport direction (see arrow S). Will be described.
Here, with reference to FIGS. 1 and 8, the control of the control unit 14 performed when the image forming apparatus 100 that has stopped urgently in the third mode restarts the image forming process will be described. FIG. 8 is a flowchart illustrating the control performed by the control unit 14 of the image forming apparatus 100 that has been urgently stopped in the third mode.

  First, for example, when a jam (paper jam) occurs while the image forming apparatus 100 is performing an image forming operation, a sensor (not shown) of the processing unit in which the jam has occurred detects the jam, and the controller 14 Send emergency stop instructions. Receiving the emergency stop instruction, the control unit 14 (S301) issues an instruction to stop each transport drum (S302). Furthermore, the control unit 14 displays that an emergency stop has been performed on a user interface (not shown) (S303).

  Next, the control part 14 receives the instruction | indication which performs the purge process made by the user's operation via a user interface (not shown) (S304). Receiving the instruction to perform the purge process, the control unit 14 determines whether or not the paper P causing the jam (jam causing paper) remains in each processing unit (S305). Here, the control unit 14 determines whether or not the jammed paper remains depending on whether or not each sensor provided in each processing unit detects the jammed paper.

If an affirmative determination (Yes) is made in S305, that is, if it is determined that jam-causing paper is present, the control unit 14 displays that the jam-causing paper remains on the user interface (not shown). Then, the jammed paper is removed by the user (S306). Thereafter, the control unit 14 again receives an instruction to perform the purge process performed by the user's operation via a user interface (not shown) (S304).
On the other hand, when a negative determination (No) is made in S305, that is, when it is determined that there is no jammed paper, the control unit 14 determines whether or not the paper P remains in each processing unit. (S307). Here, the control unit 14 determines whether or not the paper P remains depending on whether or not each sensor provided in each processing unit detects the paper P (scratch paper) remaining in each processing unit. .

  If an affirmative determination (Yes) is made in S307, that is, if it is determined that there is a scratch paper, the control unit 14 determines whether or not the scratch paper is arranged on the feeder board 15 (S308). .

When a positive determination (Yes) is made in S308, the control unit 14 issues an instruction, whereby the scratch paper is conveyed one by one to the standby conveyance drum 122 via the delivery conveyance drum 120 ( S310). In other words, all the scratch sheets on the feeder board 15 are taken out. Further, an image is formed on the paper P on the feeder board 15 by the image forming process after the restart.
Then, the control unit 14 issues an instruction to each processing unit, and the image forming apparatus 100 enters a standby state waiting for an instruction for the next image formation (S312).

  On the other hand, if a negative determination (No) is made in S308, the control unit 14 issues an instruction to transport the scratch paper (S309). Specifically, the control unit 14 drives the drive motor 16 to rotate each transport drum. Each rotating transport drum transports the scratch paper to the downstream side in the transport direction (see arrow S in FIG. 1), and discharges the scratch paper to the paper discharge container 71 of the discharge unit 70. Further, when the scratch paper is conveyed, a stamp is applied by the stamper 76 to indicate that the paper P is a scratch paper (S311). When all the scratch sheets are arranged outside the image forming apparatus 100, that is, in the paper discharge accommodating section 71, the control section 14 instructs each processing unit, and the image forming apparatus 100 instructs the next image formation. (S312).

  If a negative determination (No) is made in S307, the control unit 14 issues an instruction to each processing unit, and the image forming apparatus 100 enters a standby state waiting for an instruction for the next image formation (S312).

  In this embodiment, when a positive determination (Yes) is made in S308, that is, when the control unit 14 determines that the scratch paper is arranged on the feeder board 15, the following flow is also performed. Good. That is, the sheet P on the feeder board 15 of the sheet feeding unit 10 is not conveyed to the standby conveyance drum 122 (see S310), but the user interface indicates that the sheet P exists on the feeder board 15. (Not shown). The sheet P on the feeder board 15 may be removed by the user and stored in the storage unit 12. As a result, all the scratch sheets on the feeder board 15 are taken out.

  Further, for example, depending on the possibility that the paper P may be folded or wrinkled due to the influence of the type or thickness of the paper P, the paper P is fed from the feeder board 15 to the standby transport drum 122 or removed by the user. May be switched. That is, when using paper P (so-called strong paper) that is unlikely to be folded or wrinkled, the user removes it from the feeder board 15, and when using paper P that has high possibility, Paper is fed to the transport drum 122. This switching is performed by the control unit 14 again receiving a switching instruction made by a user operation via a user interface (not shown).

  Further, when an emergency stop is performed, a sensor that detects the number of sheets P loaded on the feeder board 15 by setting the sheet P not to be arranged on the feeder board 15 prior to restarting image formation. In addition, a system for managing the number of sheets P is not necessary.

<Others>
In the above-described embodiment, the mechanism has been described in which each transport drum has the gripper 250 and the outer peripheral surface of each transport drum holds the paper P by sandwiching the leading end in the transport direction of the paper P by the gripper 250. However, the present invention is not limited to this. For example, each conveyance drum may be configured to hold the paper P on the outer peripheral surface by air adsorption. Specifically, a large number of suction holes (openings) for holding the paper P are provided on the outer peripheral surface of each transport drum, and a vacuum channel continuous to the suction holes is provided in each transport drum. And this vacuum flow path is connected to the vacuum pump provided in the exterior of the conveyance drum via piping provided in the side surface of each conveyance drum. When the vacuum pump is operated to generate a negative pressure, an adsorption pressure is applied to the paper P through the adsorption holes and the vacuum flow path.

DESCRIPTION OF SYMBOLS 12 ... Accommodating part, 15 ... Feeder board, 16 ... Drive motor, 32 ... Treatment liquid coating device, 42Y, 42M, 42C, 42K ... Inkjet recording head, 44 ... Inkjet device, 52 ... Hot air nozzle, 54 ... Infrared heater, 62 DESCRIPTION OF SYMBOLS Fixing roll, 71 ... Paper discharge accommodating part, 74 ... Paper discharge guide board, 76 ... Stamper, 122 ... Standby conveyance drum, 132 ... Pretreatment conveyance drum, 142 ... Image formation conveyance drum, 152 ... For ink drying Conveyance drum, 162 ... conveyance drum for fixing inspection, 200 ... powder brake

Claims (6)

A paper standby / feeding unit for waiting the paper and feeding the paper in response to an instruction for image formation processing;
An image forming unit that performs an image forming process on the paper fed from the paper standby / feeding unit;
A discharge unit that discharges the paper on which the image forming process has been performed by the image forming unit;
The paper fed out from the paper standby / feed-out unit is arranged side by side in the paper conveyance direction until it is discharged from the discharge unit via the image forming unit, and rotates by transmitting a rotational driving force to each other. A plurality of conveying bodies that convey and convey the sheet downstream in the sheet conveying direction while holding the sheet on the outer peripheral surface;
When an emergency stop instruction is received in a state where the sheet is being conveyed while being held on the outer peripheral surface of any of the plurality of conveyance bodies, the image forming process by the image forming unit is stopped and the plurality of the plurality of conveyance bodies are stopped. After the operation of the transport body is stopped and the emergency stop instruction is canceled, the sheet on which image formation by the image forming unit has not been completed is held in the transport body as it is before the image forming process is resumed. And a discharge control unit that starts the operations of the plurality of transport members to transport the paper toward the discharge unit, adds a mark to the held paper, and discharges the paper from the discharge unit. Image forming apparatus.   The discharge control unit does not add the mark to a sheet that has not been fed out from the paper standby / feeding unit or that has been fed out from the paper standby / feeding unit but has not reached the image forming unit. The image forming apparatus according to claim 1.   The discharge control unit discharges a sheet in which image formation by the image forming unit is completed but the entire sheet is not discharged from the discharge unit without adding the mark. 3. The image forming apparatus according to 1 or 2.   The paper standby / feed-out unit waits for a paper whose paper size is at least one of chrysanthemum, 46-quarter, A-half, and B-size, and feeds the paper in response to an image forming process instruction. The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus. The paper standby / feeding unit is a storage unit that stores paper, and a first paper standby / feeding unit that is provided downstream of the storage unit in the paper transport direction and receives the paper fed out from the storage unit. And a second paper standby / feeding device that is provided downstream of the first paper standby / feeding unit in the paper transport direction and receives the paper fed one by one from the first paper standby / feeding unit. And
The discharge control unit, after the emergency stop instruction is released, prior to resuming the image forming process, the second paper standby / feeding sheet that is waiting in the first paper standby / feeding unit. The image forming apparatus according to claim 1, wherein the image forming apparatus is extended to a portion.   The sheet standby / feed-out unit is configured to store a sheet, a stacking surface that is provided on the downstream side of the storing unit with respect to the sheet transport direction and stacks the sheet fed from the storing unit, and the stacking surface. The image forming apparatus according to claim 1, further comprising: a stacking surface feeding unit that feeds the sheets stacked on the sheet to the conveyance body.

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