JP2022034732A - Storage medium carrier apparatus, image formation apparatus, control method, and program - Google Patents

Abstract

To transport a storage medium restarted after jam occurs such that occurrence of problems such as sagging and jam of the storage medium are suppressed.SOLUTION: A storage medium carrier apparatus includes plural pieces of transport means that transports a storage medium along a transport path, plural pieces of control means that controls operation of the plural pieces of transport means, and jam detection means that detects occurrence of the jam in the transport path. When the jam detection means detects the occurrence of the jam, the plural pieces of control means causes the storage medium transported in an upper stream with respect to an occurrence passage of the jam in the transport path to wait at a predetermined waiting position in the transport path, and then causes the plural pieces of transport means to operate by a predetermined sagging occurrence prevention control for preventing the occurrence of the sagging of the storage medium to restart transport of the storage medium.SELECTED DRAWING: Figure 3

Description

The present invention relates to a recording medium transfer device, an image forming device, a control method, and a program.

In the following Patent Document 1, for the purpose of simplifying the processing of the remaining paper when a jam occurs, it is determined whether or not the corresponding paper can be conveyed, instead of stopping all the paper remaining in the apparatus on the spot. , A configuration is disclosed in which the paper is transported to a regular ejection position or a jam ejection tray, and the position where the user disposes of the remaining paper is integrated as much as possible.

By the way, in an image forming apparatus or the like, when a jam occurs in a paper transport path, the paper conveyed upstream of the jam-occurring location (for example, a double-sided transport path) is discharged due to the jam occurring downstream thereof. It may not be possible.

Therefore, the paper previously conveyed upstream of the jam occurrence location is made to stand by at a predetermined standby position upstream of the jam occurrence location, and after removing the paper at the jam occurrence location, the remaining paper processing switch is pressed. Therefore, there is known a technique for performing purge control for transporting paper upstream from a jam occurrence location to a predetermined discharge location (for example, a purge tray).

However, in the prior art, various factors (for example, communication between a plurality of control means) are used because a plurality of transfer motors are simultaneously driven by a plurality of control means when the transfer of paper upstream from the jam occurrence point is restarted. If the operation of the downstream transfer motor is delayed from the operation of the upstream transfer motor due to a delay, communication retry in one of the control means, time difference in the start-up of the transfer motor, etc., there is a risk that paper slack or jam will occur. There is.

In order to solve the above-mentioned problems, the recording medium transport device according to the embodiment includes a plurality of transport means for transporting the recording medium along the transport path, and a plurality of control means for controlling the operation of the plurality of transport means. , A jam detecting means for detecting the occurrence of jam in the transport path, and a plurality of control means are transported upstream of the jam occurrence point in the transport path when the jam detection means detects the occurrence of jam. After the recording medium that has been used is made to stand by at a predetermined standby position in the transport path, the recording is performed by operating a plurality of transport means by a predetermined slack prevention control for preventing the slack of the recording medium. Resume transport of the medium.

According to one embodiment, it is possible to transport the recording medium that is restarted after the jam occurs so that the occurrence of defects such as sagging and jam of the recording medium can be suppressed.

The figure which shows the whole structure of the image forming apparatus which concerns on one Embodiment. The figure which shows the paper ejection operation at the time of the jam by the image forming apparatus which concerns on one Embodiment. A block diagram showing a configuration example of a motor drive system of an image forming apparatus according to an embodiment. The figure which shows the determination condition of the invalid paper and the valid paper of the paper by the image forming apparatus which concerns on one Embodiment. The figure for demonstrating the first example of the sagging occurrence prevention control by the image forming apparatus which concerns on one Embodiment. The figure for demonstrating the 2nd example of the slack occurrence prevention control by the image forming apparatus which concerns on one Embodiment. A graph showing changes in the drive speeds of two motors in the image forming apparatus according to the embodiment. The figure which shows typically the mode that the paper is conveyed by two motors in the image forming apparatus which concerns on one Embodiment. A graph showing changes in the drive speeds of two motors in the image forming apparatus according to the embodiment. The figure which shows typically the mode that the paper is conveyed by two motors in the image forming apparatus which concerns on one Embodiment. The figure which shows typically the condition which the jam of a paper occurs in the image forming apparatus which concerns on one Embodiment. A graph showing changes in the drive speeds of two motors in the image forming apparatus according to the embodiment. The figure for demonstrating the operation of the contact / separation mechanism provided in the image forming apparatus which concerns on one Embodiment. The figure which shows the structural example of the transfer roller provided in the image forming apparatus which concerns on one Embodiment. The figure which shows the modification of the predetermined standby position in the image forming apparatus which concerns on one Embodiment. The figure which shows the modification of the paper ejection operation at the time of a jam by the image forming apparatus which concerns on one Embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(Overall configuration of image forming apparatus 100)
FIG. 1 is a diagram showing an overall configuration of an image forming apparatus 100 according to an embodiment. The image forming apparatus 100 shown in FIG. 1 is an example of a “recording medium conveying device” and an “image forming apparatus”, and has at least a function of conveying a recording medium and a function of forming an image on the recording medium. It is a device. Examples of the image forming apparatus 100 include an MFP (Multifunction Peripheral / Product / Printer) having a scanning function, a printer function, a FAX function, and the like.

As shown in FIG. 1, the image forming apparatus 100 includes a main body apparatus 110, a medium supply apparatus 130A, a coating apparatus 130B, and an inversion device 130C. The medium supply device 130A, the coating device 130B, and the reversing device 130C are all subunits 130 incidentally provided to the main body device 110.

The medium supply device 130A holds a plurality of recording media. Further, the medium supply device 130A sends the recording medium on which printing is performed to the main transport path 101A of the recording medium. In this embodiment, paper P is used as an example of the recording medium. The medium supply device 130A can hold and send out a plurality of types of paper P having different sizes and the like. The main transport path 101A leads from the medium supply device 130A to the coating device 130B, the main body device 110, and the reversing device 130C. Paper P is conveyed in the main transfer path 101A by a plurality of transfer rollers 102 (an example of "transport means") provided in each device.

The coating device 130B applies the treatment liquid to the surface of the paper P sent from the medium supply device 130A to the main transport path 101A. Then, the coating device 130B transports the paper P coated with the treatment liquid to the main body device 110 via the main transport path 101A.

The main body device 110 forms an image on the surface of the paper P. The main body device 110 includes an image forming means 111, a drum 112, and a purge tray 113.

The image forming means 111 has a liquid ejection head (not shown) capable of ejecting ink by an inkjet method for each of a plurality of ink colors. The image forming means 111 ejects ink of a plurality of colors to the surface of the paper P conveyed by the drum 112 at a position facing the image forming means 111 by a plurality of liquid ejection heads, thereby ejecting ink of a plurality of colors to the surface of the paper P. Form a color image.

By rotating the drum 112, the paper P before image formation conveyed from the main transport path 101A on the downstream side is conveyed to the image forming apparatus by the image forming means 111, and the paper P on which the image is formed is conveyed. It is transported to the main transport path 101A on the downstream side. The main body device 110 transports the paper P on which the image is formed by the image forming means 111 to the reversing device 130C via the main transport path 101A on the downstream side.

The purge tray 113 is provided on the lower side of the drum 112. In the purge tray 113, when the paper P is jammed in the main transport path 101A or the like in the case of double-sided printing, the subsequent plurality of papers P'remaining in the double-sided transport path 101B of the main unit 110 are discharged. In the case of double-sided printing, the double-sided transfer path 101B is supplied with the inverted paper P from the reversing device 130C, and conveys the inverted paper P to the main transport path 101A on the upstream side. In the case of double-sided printing, when the paper P is jammed in the main transport path 101A or the like, the leading paper P'of the plurality of papers P'remaining in the double-sided transport path 101B is positioned at the predetermined standby position WP. Until this is done, the paper is transported on the double-sided transport path 101B.

Further, a plurality of paper sensors 115 are provided in each of the main transport path 101A and the double-sided transport path 101B in the main body apparatus 110. Each paper sensor 115 is, for example, an optical sensor, and detects the paper P or the paper P'carried on the main transport path 101A or the double-sided transport path 101B.

In the case of double-sided printing, the reversing device 130C reverses the paper P conveyed from the main body device 110 via the main transport path 101A (that is, the paper P for which single-sided printing has been completed). Then, the reversing device 130C supplies the reversed paper P to the double-sided transport path 101B of the main body device 110.

(Paper P'ejection operation)
FIG. 2 is a diagram showing an operation of ejecting paper P'when a jam is generated by the image forming apparatus 100 according to the embodiment. As shown in FIG. 2, in the image forming apparatus 100 according to the embodiment, in the case of double-sided printing, when the paper P is jammed in the main transport path 101A or the like, a plurality of papers P remaining in the double-sided transport path 101B are generated. 'Is conveyed on the double-sided transfer path 101B until the leading sheet P'is located at a predetermined standby position WP (arrow A in the figure). Then, the plurality of papers P'stand by in the double-sided transport path 101B with the leading paper P positioned at the predetermined standby position WP until the jammed paper P is removed. After that, in the image forming apparatus 100 according to the embodiment, after the jammed paper P is removed by the worker, when the remaining paper processing switch is pressed by the worker, the image forming apparatus 100 stands by in the double-sided transport path 101B. The plurality of sheets P'are conveyed to the purge tray 113 by the plurality of transfer rollers 102 (arrow B in the figure). At this time, the plurality of transport rollers 102 can suppress the occurrence of jam on the plurality of sheets P'by performing predetermined slack generation prevention control.

(Example of motor drive system configuration)
FIG. 3 is a block diagram showing a configuration example of a motor drive system of the image forming apparatus 100 according to the embodiment.

As shown in FIG. 3, the main body device 110 includes an image forming main body control unit 121, a plurality of drive control units 122, a plurality of drivers 123, a plurality of motors 124, a jam detection unit 125, and a determination unit 126. The image-forming main body control unit 121 can communicate with the subunit control unit 131 of the subunit 130 via serial communication. Further, the image forming main body control unit 121 can communicate with each of the plurality of drive control units 122 via serial communication. The plurality of drive control units 122 are an example of "plurality of control means". Each drive control unit 122 transmits a control signal to a plurality of drivers 123 subordinate to the drive control unit 122, whereby a plurality of motors 124 subordinate to the drive control unit 122 (that is, a plurality of motors 124 included in the main body device 110). The transport roller 102) can be driven. The jam detection unit 125 is an example of "jam detection means". If the paper P or the paper P'is not detected at a predetermined timing by any of the plurality of paper sensors 115 included in the main body apparatus 110, the jam detection unit 125 may use the paper P or the paper P in the main transport path 101A or the double-sided transport path 101B. It is detected that the paper P'has been jammed. When the jam is detected by the jam detection unit 125, the determination unit 126 uses invalid paper or valid paper for the paper P remaining in the image forming apparatus 100 based on a predetermined determination condition (see FIG. 4). It is possible to determine which one to use.

On the other hand, as shown in FIG. 3, the subunit 130 (medium supply device 130A, coating device 130B, and reversing device 130C) includes a subunit control unit 131, a drive control unit 132, a plurality of drivers 133, and a plurality of motors 134. To prepare for. The subunit control unit 131 can communicate with the image forming main body control unit 121 of the main body device 110 via serial communication. Further, the subunit control unit 131 can communicate with the drive control unit 132 via serial communication. The drive control unit 132 transmits a control signal to a plurality of drivers 133 subordinate to the drive control unit 132, thereby transmitting a control signal to a plurality of motors 134 subordinate to the drive control unit 132 (that is, a plurality of transports included in the subunit 130). The roller 102) can be driven.

Each control unit of the image forming apparatus 100 described above can be realized by one or a plurality of processing circuits. Here, the "processing circuit" in the present specification is a processor programmed to execute each function by software such as a processor implemented by an electronic circuit, or each control unit of the image forming apparatus 100 described above. It shall include devices such as ASICs (Application Specific Integrated Circuits), DSPs (digital signal processors), FPGAs (field programmable gate arrays) and conventional circuit modules designed to be used.

(Judgment conditions for invalid paper and valid paper on paper P)
FIG. 4 is a diagram showing determination conditions for invalid paper and valid paper of paper P by the image forming apparatus 100 according to the embodiment. As shown in FIG. 4, in the image forming apparatus 100 according to the embodiment, the determination unit 126 of the main body apparatus 110 determines the presence / absence of pre-coating by the coating apparatus 130B, the printing state, and the printing type (single-sided printing or double-sided printing). Therefore, it is possible to determine whether the paper P is invalid paper or valid paper.

For example, in the example shown in FIG. 4, when the precoating by the coating device 130B is required, the determination unit 126 determines that the paper P that has not been precoated at the time of jam occurrence is "effective paper".

Further, for example, in the example shown in FIG. 4, when the precoating by the coating device 130B is required, the determination unit 126 determines that the paper P that has already been precoated at the time of jam occurrence is "invalid paper". .. However, the paper P for which printing has already been completed is determined to be "effective paper".

Further, for example, in the example shown in FIG. 4, the determination unit 126 determines that the paper P for which printing has not started at the time of jam occurrence is "effective paper" when the precoating by the coating device 130B is not required. ..

Further, for example, in the example shown in FIG. 4, the determination unit 126 determines that the paper P being printed is "invalid paper" when the jam occurs when the precoating by the coating device 130B is not required.

Further, for example, in the example shown in FIG. 4, the determination unit 126 determines that the paper P for which printing has already been completed at the time of jam occurrence is "effective paper" when the precoating by the coating device 130B is not required. do. However, in the case of double-sided printing, paper P for which printing on only one side has been completed is determined to be "invalid paper".

(First example of sagging prevention control)
FIG. 5 is a diagram for explaining a first example of sagging generation prevention control by the image forming apparatus 100 according to the embodiment.

In this first example, the plurality of drive control units 122 included in the main body device 110 make the plurality of sheets P'remaining in the double-sided transport path 101B stand by at a predetermined standby position WP at the time of jam occurrence, and then a plurality of transports. By sequentially operating the rollers 102 from the downstream side in the double-sided transfer path 101B, the transfer of the plurality of sheets P'is resumed.

In the example shown in FIG. 5, the main body device 110 has a plurality of motors 124. Specifically, the main body device 110 has three motors 124A1 to A3 in the main transport path 101A. Further, the main body device 110 has nine motors 124B1 to B9 on the double-sided transport path 101B.

The plurality of motors 124 shown in FIG. 5 are controlled by a plurality of drive control units 122 (see FIG. 3) included in the main body device 110. Therefore, even if the driving of the plurality of motors 124 is started simultaneously by the plurality of drive control units 122, the driving of any of the motors 124 may be delayed due to the communication delay or the difference in the motor rise time. In this case, if the drive of the motor 124 on the downstream side is delayed, there is a possibility that slack and jam may occur in the paper P'.

Therefore, in this first example, in the image forming apparatus 100 according to one embodiment, the plurality of drive control units 122 start driving the plurality of motors 124 sequentially from the downstream motor 124 with a time lag. , Controlled by the pulling force of a plurality of sheets P'. For example, the plurality of drive control units 122 start driving in the order of motor 124A3, motor 124A2, motor 124A1, motor 124B9, motor 124B8, motor 124B7, .... As a result, the image forming apparatus 100 according to the embodiment can convey the plurality of sheets P'to the purge tray 113 while suppressing the slack of the plurality of sheets P'. Since the plurality of papers P'standby in the double-sided transport path 101B are invalid papers on which only one side is printed (see FIG. 4), even if a force in the pulling direction is applied and scratches occur on the printed surface. no problem.

The first example of this slack generation prevention control is preferably executed when the paper P'is "invalid paper". Therefore, the plurality of drive control units 122 execute the first example of the slack generation prevention control only when the paper P'is determined to be "invalid paper" by the determination unit 126 (see FIG. 4). May be good.

(Second example of sagging prevention control)
FIG. 6 is a diagram for explaining a second example of sagging generation prevention control by the image forming apparatus 100 according to the embodiment.

In this second example, the plurality of drive control units 122 included in the main body device 110 make the plurality of sheets P'remaining in the double-sided transport path 101B stand by at a predetermined standby position WP at the time of jam occurrence, and then a plurality of transports. By sequentially operating the rollers 102 for each predetermined control block from the downstream side in the double-sided transfer path 101B, the transfer of the plurality of sheets P'is resumed.

In the example shown in FIG. 6, the main body device 110 has a plurality of motors 124. Specifically, the main body device 110 has three motors 124A1 to A3 in the main transport path 101A. Further, the main body device 110 has nine motors 124B1 to B9 on the double-sided transport path 101B. The plurality of motors 124 are classified into five control blocks B1 to B5. The control unit block B1 includes motors 124A1 and A2. The control unit block B2 includes the motor 124A3. The control unit block B3 includes motors 124B1 and B2. The control unit block B4 includes motors 124B3 and B4. The control unit block B5 includes motors 124B5 to B9.

In this second example, in the image forming apparatus 100 according to the embodiment, the plurality of drive control units 122 start driving the plurality of motors 124 sequentially from the downstream motor 124 with a time lag for each control block. Thereby, it is controlled by the force in the pulling direction of the plurality of sheets P'. For example, the plurality of drive control units 122 start driving in the order of control block BK2, control block BK1, control block BK5, control block BK4, and control block BK3. As a result, the image forming apparatus 100 according to the embodiment can convey the plurality of sheets P'to the purge tray 113 while suppressing the slack of the plurality of sheets P'.

The second example of this slack generation prevention control is preferably executed when the paper P'is "invalid paper". Therefore, the plurality of drive control units 122 execute the second example of the slack generation prevention control only when the paper P'is determined to be "invalid paper" by the determination unit 126 (see FIG. 4). May be good.

(Third example of sagging prevention control)
Next, with reference to FIGS. 7 and 8, a third example of the slack generation prevention control by the image forming apparatus 100 according to the embodiment will be described. FIG. 7 is a graph showing changes in the drive speeds of the two motors 124 in the image forming apparatus 100 according to the embodiment. FIG. 8 is a diagram schematically showing how paper P'is conveyed by two motors 124 in the image forming apparatus 100 according to the embodiment.

In this third example, the plurality of drive control units 122 included in the main body device 110 make the plurality of sheets P'stand by at a predetermined standby position WP, and then the plurality of motors 124 holding one sheet P'. By operating a plurality of motors 124 so that the start-up time of the motor 124 on the upstream side is longer than the start-up time of the motor 124 on the downstream side of the (conveyor roller 102), the one sheet P. 'Resume transport. Specifically, as shown in FIGS. 7 and 8, the plurality of drive control units 122 make the acceleration at the start of the motor 124 on the upstream side smaller than the acceleration at the start of the motor 124 on the downstream side.

As a result, the image forming apparatus 100 according to the embodiment can control one sheet P'with a force in the pulling direction. Therefore, the image forming apparatus 100 according to the embodiment performs the same control on the plurality of sheets P', thereby suppressing the slack of the plurality of sheets P'and sending the plurality of sheets P'to the purge tray 113. Can be transported.

It is preferable that the third example of the slack generation prevention control is executed when the paper P'is "invalid paper". Therefore, the plurality of drive control units 122 execute the third example of the slack generation prevention control only when the paper P'is determined to be "invalid paper" by the determination unit 126 (see FIG. 4). May be good.

(Fourth example of sagging prevention control)
Next, a fourth example of the slack generation prevention control by the image forming apparatus 100 according to the embodiment will be described with reference to FIGS. 9 and 10. FIG. 9 is a graph showing changes in the drive speeds of the two motors 124 in the image forming apparatus 100 according to the embodiment. FIG. 10 is a diagram schematically showing how paper P'is conveyed by two motors 124 in the image forming apparatus 100 according to the embodiment.

In this fourth example, the plurality of drive control units 122 included in the main body device 110 make the plurality of sheets P'stand by at a predetermined standby position WP, and then the plurality of motors 124 holding one sheet P'. By operating a plurality of motors 124 so that the linear speed of the motor 124 on the upstream side of the (conveying roller 102) is smaller than the linear speed of the motor 124 on the downstream side, the paper P'of the one sheet P'. Resume transport. As a result, the image forming apparatus 100 according to the embodiment can control one sheet P'with a force in the pulling direction.

After that, when the two motors 124 for holding the one paper P'are changed by conveying the one paper P', the plurality of drive control units 122 newly hold the one paper P'. Similar control (control to make the line speed different) is performed for the two motors 124. As a result, the image forming apparatus 100 according to the embodiment can always control one sheet P'with a force in the pulling direction.

The image forming apparatus 100 according to the embodiment performs the same control on the plurality of sheets P'to convey the plurality of sheets P'to the purge tray 113 while suppressing the slack of the plurality of sheets P'. be able to.

The fourth example of this slack generation prevention control is preferably executed when the paper P'is "invalid paper". Therefore, the plurality of drive control units 122 execute the fourth example of the slack generation prevention control only when the paper P'is determined to be "invalid paper" by the determination unit 126 (see FIG. 4). May be good.

(Fifth example of sagging prevention control)
Next, with reference to FIG. 11, a fifth example of the sagging generation prevention control by the image forming apparatus 100 according to the embodiment will be described. FIG. 11 is a diagram schematically showing the conditions under which jam of the paper P'is generated in the image forming apparatus 100 according to the embodiment.

In this fifth example, the plurality of drive control units 122 included in the main body device 110 make the plurality of sheets P'stand by at a predetermined standby position WP, and then have a low transfer speed to the extent that jam is unlikely to occur. By simultaneously starting the operation of the plurality of motors 124, the transfer of the plurality of sheets P'is restarted.

For example, as shown in FIG. 11, when the upstream transfer roller 102 is driven while the downstream transfer roller 102 is stopped, the amount of paper P'conveyed by the upstream transfer roller 102 (jam generation). Jam occurs when the transport amount) exceeds the transport path gap [mm] * 2. In view of this, for example, "a transport speed low enough to prevent jams from occurring" is a transport speed that satisfies the following condition 1.

Transport speed <(Transfer path gap [mm] * 2) / Maximum simultaneous drive delay time [s] ... (Condition 1)

For example, as shown in FIG. 11, when the transport path gap is 4 [mm] and the maximum simultaneous drive delay time is 0.3 [s], the jam generation transport amount is 8 [mm]. The "transport speed low to the extent that jam is unlikely to occur" is a transport speed of less than 26 [mm / s].

The image forming apparatus 100 according to the embodiment starts the operations of the plurality of motors 124 at the same time so as to obtain the transfer speed calculated in this way, so that the start-up of any of the motors 124 is delayed by any chance. Even in this case, the plurality of sheets P'can be conveyed to the purge tray 113 while suppressing the occurrence of jam of the plurality of sheets P'.

It is preferable that the fifth example of the slack generation prevention control is executed regardless of whether the paper P'is "invalid paper" or "effective paper". Therefore, the plurality of drive control units 122 control the slack generation prevention even when the paper P'is determined to be either "invalid paper" or "valid paper" by the determination unit 126 (see FIG. 4). The fifth example may be executed.

(Sixth example of sagging prevention control)
Next, with reference to FIG. 12, a sixth example of the sagging generation prevention control by the image forming apparatus 100 according to the embodiment will be described. FIG. 12 is a graph showing changes in the drive speeds of the two motors 124 in the image forming apparatus 100 according to the embodiment.

In this sixth example, the plurality of drive control units 122 included in the main body device 110 wait for the plurality of sheets P'at a predetermined standby position WP, and then obtain each of the plurality of transfer rollers 102 in advance. By giving a drive instruction at a timing considering the delay time from the drive instruction to the start of the drive and operating the drive instruction, the transfer of a plurality of sheets P'is restarted.

For example, in the example shown in FIG. 12, the delay time from the drive instruction of the transport roller 102 on the upstream side to the start of drive, which has been learned in advance, is 6 [s]. On the other hand, the delay time from the drive instruction of the transport roller 102 on the downstream side to the start of drive is approximately 0 [s]. Therefore, the plurality of drive control units 122 advance the drive instruction timing t1 of the upstream transfer roller 102 by 6 [s] earlier than the drive instruction timing t2 of the downstream transfer roller 102. As a result, as shown in FIG. 12, the upstream transfer roller 102 and the downstream transfer roller 102 are started to be driven substantially at the same time. As a result, the image forming apparatus 100 according to the embodiment can convey the plurality of sheets P'to the purge tray 113 while suppressing the occurrence of slack in the plurality of sheets P'.

It is preferable that the sixth example of the slack generation prevention control is executed regardless of whether the paper P'is "invalid paper" or "effective paper". Therefore, the plurality of drive control units 122 control the slack generation prevention even when the paper P'is determined to be either "invalid paper" or "valid paper" by the determination unit 126 (see FIG. 4). The sixth example may be executed.

(Contact / detachment mechanism 102B)
FIG. 13 is a diagram for explaining the operation of the contact / detachment mechanism 102B included in the image forming apparatus 100 according to the embodiment. In the example shown in FIG. 13, of the two transport rollers 102 included in the main body device 110, the transport roller 102 on the downstream side has a contact / detachment mechanism 102B. As a result, the transport roller 102 on the downstream side can be switched between a state of being in contact with the paper P'and a state of being separated from the paper P'.

For example, FIG. 13 shows the operation of the contact / detachment mechanism 102B when the rising edge of the transport roller 102 on the upstream side is delayed from the rising edge of the transport roller 102 on the downstream side.

In this case, the image forming apparatus 100 according to the embodiment has a mechanism for connecting and disconnecting the downstream transfer roller 102 until both the upstream transfer roller 102 and the downstream transfer roller 102 have started up. It is separated by 102B.

Then, the image forming apparatus 100 according to the embodiment contacts the downstream transfer roller 102 by the contact / detachment mechanism 102B in a state where both the upstream transfer roller 102 and the downstream transfer roller 102 have risen. Put it in a state.

As a result, the image forming apparatus 100 according to the embodiment can prevent two transport rollers 102 having different rotation speeds from coming into contact with the paper P'at the same time. Therefore, the image forming apparatus 100 according to the embodiment can convey the paper P'without causing slack or a load in the pulling direction on the paper P'.

It is preferable that the image forming apparatus 100 controls the contact / detachment mechanism 102B with respect to at least two transport rollers 102 that are adjacent to each other and are controlled by different drive control units 122. In this case, the contact / detachment mechanism 102B may be provided on either one of the two transfer rollers 102, or the contact / detachment mechanism 102B may be provided on both of the two transfer rollers 102. When the contact / detachment mechanism 102B is provided on both of the two transport rollers 102, only the upstream transport roller 102 may be separated until both of the two transport rollers 102 have started up, and only the upstream transport roller 102 may be separated from each other. Only the transfer roller 102 may be separated, or both of the two transfer rollers 102 may be separated from each other.

Further, the contact / detachment mechanism 102B may be provided only on one transfer roller 102 controlled by one drive control unit 122, and the contact / detachment mechanism 102B may be provided with respect to a plurality of transfer rollers 102 controlled by one drive control unit 122. The mechanism 102B may be provided.

(Configuration example of transport roller 102)
FIG. 14 is a diagram showing a configuration example of a transport roller 102 included in the image forming apparatus 100 according to the embodiment. In the example shown in FIG. 14, the ratchet mechanism 102A is provided on the roller shaft of the transport roller 102. The ratchet mechanism 102A is an example of a "following mechanism capable of following the transport speed of a recording medium and capable of transporting".

As a result, in the image forming apparatus 100 according to the embodiment, as illustrated in FIG. 14, when the transport roller 102 on the upstream side is driven while the transport roller 102 on the downstream side is stopped, the image forming apparatus 100 is on the upstream side. The transport roller 102 on the downstream side can be idled (arrow A in the figure) following the paper P'extruded to the downstream side by the transport roller 102. As a result, the image forming apparatus 100 according to the embodiment can transport the paper P'to the downstream side of the transport roller 102 on the downstream side without causing slack in the paper P'.

On the contrary, in the image forming apparatus 100 according to the embodiment, when the transport roller 102 on the downstream side is driven while the transport roller 102 on the upstream side is stopped, the image forming apparatus 100 is pulled out to the downstream side by the transport roller 102 on the downstream side. The transport roller 102 on the upstream side can idle in accordance with the paper P'. As a result, the image forming apparatus 100 according to the embodiment can transport the paper P'to the downstream side of the transport roller 102 on the downstream side without damaging the paper P'by the load in the pulling direction. ..

(Modification example of predetermined standby position)
FIG. 15 is a diagram showing a modified example of a predetermined standby position in the image forming apparatus 100 according to the embodiment. In the example shown in FIG. 15, the main unit 110 has a predetermined standby position WP2 instead of the predetermined standby position WP (see FIG. 1). As shown in FIG. 15, the standby position WP2 is a position where the paper P'waiting at the standby position WP2 is not curved. For example, in the image forming apparatus 100 illustrated in FIG. 1, since the standby position WP is a position where the paper P'is curved, there is a possibility that the paper P'is curled while the paper P'is waiting at the standby position WP. be. If the paper P'is curled in this way, the paper P'may not be reusable. Therefore, the image forming apparatus 100 exemplified in FIG. 15 makes the paper P'stand by at the standby position WP2 that does not bend the paper P'. As a result, the image forming apparatus 100 according to the embodiment can suppress the occurrence of curl during standby of the paper P'even if the paper P'is prone to curl.

(Modified example of discharge operation)
FIG. 16 is a diagram showing a modified example of the ejection operation of the paper P'when a jam is generated by the image forming apparatus 100 according to the embodiment. In the image forming apparatus 100 illustrated in FIG. 16, in the case of double-sided printing, when a jam of paper P occurs in the main transport path 101A or the like, a plurality of papers P'remaining in the double-sided transport path 101B are the leading papers. The double-sided transport path 101B is transported until P'is located at a predetermined standby position WP (arrow A in the figure). Then, the plurality of papers P'stand by in the double-sided transport path 101B with the leading paper P positioned at the predetermined standby position WP until the jammed paper P is removed. After that, in the image forming apparatus 100 illustrated in FIG. 16, when the paper P in which the jam is generated is removed by the worker and then the remaining paper processing switch is pressed by the worker, the image forming apparatus 100 stands by in the double-sided transport path 101B. The plurality of sheets P'pass through the lower side of the drum 112 (that is, avoid being conveyed to the image forming position by the drum 112) and are conveyed to the reversing device 130C (arrow B in the figure). , C). Then, the plurality of sheets P'conveyed to the reversing device 130C are ejected by the reversing device 130C to the same place as the ejection place of the paper P for which printing is normally completed (arrows D and E in the figure). As a result, the operator can process a plurality of sheets P'at the same place as the ejection place of the sheets P for which printing is normally completed.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to these embodiments, and various modifications or modifications are made within the scope of the gist of the present invention described in the claims. It can be changed.

100 Image forming device 101A Main transfer path 101B Double-sided transfer path 102 Transfer roller 102A Ratchet mechanism 102B Contact / detachment mechanism 110 Main unit device 111 Image forming means 112 Drum 113 Purge tray 115 Paper sensor 121 Image drawing main body control unit 122 Drive control unit 123 Driver 124 Motor 125 Jam detection unit 126 Judgment unit 130 Subunit 130A Medium supply device 130B Coating device 130C Reversing device 131 Subunit control unit 132 Drive control unit 133 Driver 134 Motor P, P'Paper WP, WP2 Standby position

Japanese Unexamined Patent Publication No. 2019-101105

Claims (14)

A plurality of transport means for transporting a recording medium along a transport path, and
A plurality of control means for controlling the operation of the plurality of transport means, and
A jam detecting means for detecting the occurrence of jam in the transport path is provided.
The plurality of control means
When the occurrence of the jam was detected by the jam detecting means, the recording medium transported upstream of the location where the jam occurred in the transport path was made to stand by at a predetermined standby position in the transport path. After that, the recording medium transport device is characterized in that the transport of the recording medium is restarted by operating the plurality of transport means by a predetermined slack generation prevention control for preventing the occurrence of the slack of the recording medium. The plurality of control means
As the predetermined sagging prevention control, after the recording medium is made to stand by at the predetermined standby position, the plurality of transport means are sequentially operated from the downstream side in the transport path to transport the recording medium. The recording medium transport device according to claim 1, wherein the recording medium transport device is restarted. The plurality of control means
The claim is characterized in that, as the predetermined sagging prevention control, the plurality of transport means are sequentially operated in predetermined control block units from the downstream side in the transport path to restart the transport of the recording medium. Item 2. The recording medium transport device according to item 2. The plurality of control means
As the predetermined sagging prevention control, after the recording medium is made to stand by at the predetermined standby position, the start-up time of the upstream side of the plurality of transport means holding the recording medium is started. However, the record according to claim 1, wherein the transport of the recording medium is restarted by operating the plurality of transport means so as to be longer than the start-up time of the transport means on the downstream side. Media transfer device. The plurality of control means
As the predetermined sagging prevention control, after the recording medium is made to stand by at the predetermined standby position, the linear speed of the upstream side of the plurality of transport means holding the recording medium is set. The recording medium transport according to claim 1, wherein the transport of the recording medium is restarted by operating the plurality of transport means so as to be smaller than the linear speed of the transport means on the downstream side. Device. The plurality of control means
As the predetermined sagging prevention control, after the recording medium is made to stand by at the predetermined standby position, the operation of the plurality of transport means is simultaneously started at a motor speed low enough to prevent jams from occurring. The recording medium transport device according to claim 1, wherein the transport of the recording medium is restarted. The plurality of control means
As the predetermined sagging prevention control, after the recording medium is made to stand by at the predetermined standby position, the delay time from the drive instruction obtained in advance to the start of driving of each of the plurality of transport means is taken into consideration. The recording medium transfer device according to claim 1, wherein the transfer of the recording medium is restarted by giving a drive instruction at a timing and operating the recording medium. A claim, wherein at least one of the two transport means provided adjacent to each other in the transport path and controlled by the control means different from each other has a contact / detachment mechanism with respect to the recording medium. The recording medium transport device according to any one of 1 to 7. The plurality of transport means
The recording medium transport device according to any one of claims 1 to 8, further comprising a follow-up mechanism capable of following the transport speed of the recording medium and capable of transport operation. The predetermined standby position is
The recording medium transporting apparatus according to any one of claims 1 to 9, wherein the recording medium is in a position where the recording medium is not curved. The plurality of control means
Claims 1 to 10 are characterized in that, after resuming the transfer of the recording medium by the predetermined slack generation prevention control, the recording medium is discharged to the same place as the discharge place of the recording medium for which printing is normally completed. The recording medium transport device according to any one of the above items. A plurality of transport means for transporting a recording medium along a transport path, and
A plurality of control means for controlling the operation of the plurality of transport means, and
A jam detecting means for detecting the occurrence of jam in the transport path is provided.
The plurality of control means
When the occurrence of the jam was detected by the jam detecting means, the recording medium transported upstream of the location where the jam occurred in the transport path was made to stand by at a predetermined standby position in the transport path. After that, the image forming apparatus is characterized in that the transport of the recording medium is restarted by operating the plurality of transport means by a predetermined sagging prevention control for preventing the occurrence of the sagging of the recording medium. A plurality of transport means for transporting a recording medium along a transport path, and
A plurality of control means for controlling the operation of the plurality of transport means, and
It is a control method of a recording medium transport device provided with a jam detecting means for detecting the occurrence of jam in the transport path.
The plurality of control means
When the occurrence of the jam was detected by the jam detecting means, the recording medium transported upstream of the location where the jam occurred in the transport path was made to stand by at a predetermined standby position in the transport path. After that, a control method comprising restarting the transportation of the recording medium by operating the plurality of conveying means by a predetermined slack generation prevention control for preventing the occurrence of the slack of the recording medium. A plurality of transport means for transporting a recording medium along a transport path, and
A plurality of control means for controlling the operation of the plurality of transport means, and
A program for a recording medium transport device provided with a jam detecting means for detecting the occurrence of jam in the transport path.
Computer,
When the occurrence of the jam was detected by the jam detecting means, the recording medium transported upstream of the location where the jam occurred in the transport path was made to stand by at a predetermined standby position in the transport path. After that, a program that operates as the plurality of control means for resuming the transport of the recording medium by operating the plurality of transport means by a predetermined slack generation prevention control for preventing the occurrence of the slack of the recording medium.

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