JP2017122898A - Image forming apparatus and image forming system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus that can suppress the occurrence of paper jam due to accumulated meander of a continuous recording material even when image formation is performed on the continuous recording material.SOLUTION: An image forming apparatus 101 comprises: a secondary transfer roller 43a that transfers, while sandwiching with an intermediate transfer belt 42, a toner image formed on the intermediate transfer belt 42 onto a form F being conveyed; and a fixing device 50 that fixes the toner image that has been conveyed, while sandwiched, and secondarily transferred to the form F. A form F having a length in a conveyance direction longer than a conveyance path inside an image forming apparatus 101 can be used as the form F. The image forming apparatus includes a guide resistance addition part 110 including an end guide pair 113 that regulate the width direction position and attitude of the form F on the upstream side in the conveyance direction of the form F of the secondary transfer roller 43a, and a friction member 112 that adds a resistance force against a conveying force of the fixing device 50 transmitted through the form F from the downstream side in the conveyance direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an image forming apparatus and an image forming system including the image forming apparatus.

  The recording material used in the image forming apparatus is a cut recording material such as a cut sheet (hereinafter referred to as a cut recording material) cut in a conveyance direction length shorter than the length of the recording material conveyance path in the image forming apparatus. There is. There is also a continuous recording material (hereinafter referred to as a continuous recording material) such as continuous paper whose conveying direction length is longer than the length of the recording material conveyance path in the image forming apparatus. An image forming apparatus capable of forming an image on one or both recording materials has been conventionally known.

Also, when conveying a recording material having a length that is sandwiched between both a transfer unit that transfers the toner image on the image carrier to the recording material and a fixing unit that fixes the transferred toner image on the recording material. It has been conventionally known that the following problems may occur. Due to the fluctuation in the recording material conveyance speed by the fixing means, the recording material is loosened or excessively stretched, resulting in a transfer deviation and a reduction in image quality to be formed.
An image forming apparatus that can suppress (prevent) the occurrence of the above-described problems has been conventionally proposed.

For example, Patent Document 1 describes the following image forming apparatus.
Transfer means (secondary transfer roller) for transferring a toner image formed on an image carrier (intermediate transfer belt) between the image carrier and a cut recording material (paper) being conveyed. ing. The image forming apparatus also includes a fixing unit (fixing device) that fixes the transferred toner image to the cut recording material while nipping and conveying the toner image.
Then, the conveyance speed of the cut recording material by the driving roller that conveys the cut recording material and the rotation period of the drive roller included in the fixing unit are measured, and the slack (loop) of the cut recording material between the transfer unit and the fixing unit is measured. ) Is controlled so that the conveying speed by the driving roller is not formed.
By controlling in this way, the conveyance speed of the cut recording material by the fixing unit can be controlled appropriately, and image quality is guaranteed without forming a slack of the cut recording material between the transfer unit and the fixing unit. This is described in Patent Document 1.

However, in the conventional configuration in which the recording material conveyance speed by the driving roller of the fixing unit is measured and the rotation speed of the driving roller of the fixing unit is controlled, the recording material by the fixing unit is detected by detecting the leading edge of the cut recording material by a sensor. The conveyance speed is measured. For this reason, it cannot be applied to a configuration using a continuous recording material in which the leading end of the recording material does not exist during image formation.
In the conventional configuration using the continuous recording material, if the continuous recording material is slack in the recording material conveyance path of the image forming apparatus, the tension of the continuous recording material is reduced and the minute recording of the continuous recording material is accumulated. There was a risk of jamming.

  In order to solve the above-described problem, the invention described in claim 1 is configured such that the toner image formed on the image carrier is sandwiched between the image carrier and transferred onto the recording material being conveyed. In an image forming apparatus including a transfer unit and a fixing unit that fixes a toner image transferred while being nipped and transported to the recording material, the recording material is transported more than the recording material transport path in the image forming apparatus. A continuous recording material having a long length can be used, and a guide member for regulating the position and orientation of the continuous recording material in the width direction on the upstream side in the transport direction of the transfer unit in the recording material transport path, and the recording material transport A guide resistance adding portion having a friction member for adding a resistance force against a conveying force transmitted from the downstream side in the direction through the continuous recording material is provided.

  According to the present invention, it is possible to provide an image forming apparatus capable of suppressing the occurrence of a jam due to the meandering accumulation of the continuous recording material even if the image is formed on the continuous recording material.

A schematic configuration diagram of a printing press including an image forming apparatus according to an embodiment. FIG. 3 is an explanatory diagram of a configuration relating to a back tension of the image forming apparatus and a form conveyance path from the guide unit to the fixing device. FIG. 6 is a flowchart of the operation of the sheet conveyance related part from the start to the end of printing of the image forming apparatus. Explanatory drawing about the reason which can suppress generation | occurrence | production of meandering of a form. Explanatory drawing of the conveyance resistance adjustment mechanism which changes the conveyance resistance added by a guide resistance addition part, or cancels | releases conveyance resistance.

Hereinafter, an embodiment of an image forming system (hereinafter referred to as a printing press 100) including an electrophotographic image forming apparatus (hereinafter referred to as an image forming apparatus 101) to which the present invention is applied will be described with reference to the drawings. To do.
FIG. 1 is a schematic configuration diagram of a printing press 100 including an image forming apparatus 101 according to the present embodiment. FIG. 2 is a conveyance path of a form F from a guide resistance adding unit 110 of the image forming apparatus 101 to a fixing device 50. It is explanatory drawing of the structure which concerns.

As shown in FIG. 1, a printing machine 100 includes a sheet feeding device 201 that feeds a feeding roll paper BR that is roll paper as continuous paper, an image forming apparatus 101 that includes a guide resistance adding unit 110, and a paper winding device 301. Consists of.
The roll paper BR as a recording material used in the printing machine 100 is a continuous label paper wound in a roll shape, and is applied to the surface base material on which an image is formed by the image forming apparatus 101 and the back surface of the surface base material. And a release paper (release film) that holds the substrate with the adhesive.

The paper delivery device 201 includes a roll attachment unit 210 for attaching the roll paper BR, a delivery roller unit 220, a delivery loop detection sensor 231, a delivery control unit 280, and the like, and delivers the roll paper BR to the image forming apparatus 101 (feeds paper). ).
As the delivery loop detection sensor 231, for example, an optical system that receives reflected light of infrared light toward the delivery loop detection mirror 232 provided on the side surface of the image forming apparatus 101 by a light receiving unit is used. it can.

  By using such a delivery loop detection sensor 231, it is possible to easily detect that the delivery loop 230 formed by the roll paper BR delivered from the paper delivery device 201 has reached a lower position in the figure than a predetermined position. . Thereby, the control of the drive source of the delivery roller unit 220 that delivers the roll paper BR can be appropriately controlled by the delivery control unit 280.

The image forming apparatus 101 includes a display / operation unit 71, an exposure unit 30, a tandem image forming unit 20, a transfer unit 40, a guide resistance adding unit 110, a fixing device 50, a discharge roller pair 61, a main body control unit 80, and the like.
The display / operation unit 71 sets the type of recording material and the number of prints of the printing unit (hereinafter referred to as “form F”) of the roll paper BR sent out from the paper feed device 201 and displays the display panel, print start button, etc. have.
The exposure unit 30 includes a first exposure device 31a and a second exposure device 31b that are two exposure devices, and the image forming units 21Y and 21Y of the tandem image forming unit 20 in which the first exposure device 31a is disposed below. The surface of the photosensitive drums 1Y and 1M held in M is exposed to form an electrostatic latent image. On the other hand, the second exposure device 31b exposes the surface of the photosensitive drums 1C, K included in the image forming units 21C, K of the tandem image forming unit 20 disposed below to form an electrostatic latent image.

The tandem image forming unit 20 includes four (plural) image forming units 21Y, M, C, and K for forming a color toner image along the upper tension surface of the intermediate transfer belt 42 of the transfer unit 40. Have.
Each image forming unit 21 has a yellow (Y), magenta (M), cyan (C), and black (K) toner image on the photosensitive drums 1Y, 1M, 1C, and 1K as image carriers. Formed (supported). Here, since the configuration of each image forming unit 21 is different in the color of the toner to be used and the other configurations are substantially the same, the configuration of the image forming unit 21Y will be described below.
The image forming unit 21Y includes a photosensitive drum 1Y as an image carrier, a charging roller 2Y for uniformly charging the surface of the photosensitive drum 1Y, and a first exposure device 31a disposed above, so that the photosensitive member after uniform charging is obtained. A developing device 3Y that develops the electrostatic latent image formed on the surface of the drum 1Y is provided. The photoconductor cleaning device 4 also cleans residual toner remaining on the photoconductor drum 1Y after being primarily transferred onto the intermediate transfer belt 42 by the primary transfer roller 41Y of the transfer unit 40.

Then, each image forming unit 21 is exposed to light by the exposure unit 30 after the surface of each photoconductive drum 1 is uniformly charged based on the control of the main body control unit 80, and is exposed on each photoconductive drum 1. An electrostatic latent image corresponding to each color is formed and developed by each developing device 3 to form (carry) a toner image.
The toner images of the respective colors developed by the developing devices 3 are sequentially primary-transferred onto an intermediate transfer belt 42 included in the transfer unit 40, whereby a color toner image is formed (supported) on the intermediate transfer belt 42. The Rukoto.
Here, with the printing operation, each color toner is consumed in each developing device 3 of each image forming unit 21, but in order to keep the toner density in each developing device 3 substantially constant, the main body control unit 80. Based on this control, toner of each color is supplied from the toner bottles 72Y, 72M, 72C, 72K.

  The transfer unit 40 primarily transfers an intermediate transfer belt 42 disposed substantially in the center of the image forming apparatus 101 and a toner image formed on each photosensitive drum 1 of each image forming unit 21 onto the intermediate transfer belt 42. Primary transfer rollers 41Y, 41M, 41C, and 41K as primary transfer means. The image forming apparatus also includes a secondary transfer device 43 that secondarily transfers the color toner image primarily transferred onto the intermediate transfer belt 42 onto the form F, which is a printing unit of the roll paper BR fed from the paper feed device 201. . A belt cleaning device 48 is also provided for cleaning residual toner remaining on the intermediate transfer belt 42 after the secondary transfer.

The intermediate transfer belt 42 has an inner circumference spanned by a plurality of roller members such as each primary transfer roller 41, a belt driving roller 44, a secondary transfer counter roller 43 b, a cleaning counter roller 47, and a belt driven roller 45, and the tension roller 46. Thus, the tension is applied from the outer peripheral side. Then, the belt drive roller 44 is driven to rotate and is held so that the surface can be moved (rotated) clockwise in FIGS. The intermediate transfer belt 42 is an image carrier that carries a color toner image that is secondarily transferred onto the form F.
Each primary transfer roller 41 is provided at a position facing each photoconductive drum 1 with the intermediate transfer belt 42 interposed therebetween, which is a primary transfer position for transferring a toner image from each photoconductive drum 1 to the intermediate transfer belt 42. ing. Then, a primary transfer electric field is formed between each photosensitive drum 1 by the applied primary transfer bias, and each color toner image carried on the surface of each photosensitive drum 1 is primarily transferred to the intermediate transfer belt 42. Is.

The secondary transfer device 43 has a secondary transfer roller 43a provided on the opposite side of the tandem image forming unit 20 with the intermediate transfer belt 42 interposed therebetween, and a secondary transfer roller 43a facing the secondary transfer roller 43a via the intermediate transfer belt 42. It consists of a next transfer counter roller 43b and the like.
In the secondary transfer device 43, a secondary transfer electric field is formed by applying a secondary transfer bias to the secondary transfer roller 43a pressed against the secondary transfer counter roller 43b. Then, by this secondary transfer electric field, the color toner image on the intermediate transfer belt 42 is transferred onto the form F which is a printing unit of the roll paper BR sent from the paper feed device 201 via the guide resistance adding unit 110. Next transfer.

The secondary transfer roller 43a included in the secondary transfer device 43 is provided so as to be able to come into contact with and separate from the intermediate transfer belt 42 laid over the secondary transfer counter roller 43b by driving by a driving source. As shown in FIG. 2, the secondary transfer roller 43a is also provided with an encoder 75 for measuring a pulse period when the secondary transfer roller 43a rotates.
Further, in the secondary transfer device 43, a roll paper BR (form F) inputted from the display / operation unit 71 or the like is applied with a transfer bias (transfer current) applied to the secondary transfer roller 43a, which is a parameter of secondary transfer conditions. ) And the like are controlled by the main body control unit 80.

  The belt cleaning device 48 includes a belt cleaning blade 49, a case that houses the belt cleaning blade 49, a cleaning counter roller 47 that faces the intermediate transfer belt 42, and the like. Then, the residual toner remaining on the intermediate transfer belt 42 after the secondary transfer is scraped off by the belt cleaning blade 49 for cleaning.

As shown in FIGS. 1 and 2, the guide resistance adding unit 110 includes a first shaft 111a, a second shaft 111b, a third shaft 111c, a friction member 112, an end guide pair 113, and the like as three shafts 111. Is done.
As will be described in detail later, the position and orientation of the form F, which is a printing unit of the roll paper BR fed from the paper feeding device 201, is determined by the end guide pair 113, and transport resistance is given by the friction member 112. The image is taken into the image forming apparatus 101 in a state. Thereafter, the toner is sent to the secondary transfer nip portion of the secondary transfer device 43.
Here, the friction member 112 is in a pressed state pressed against the second shaft 111b via the form F, and a pressed release state in which the pressed state is released away from the second shaft 111b side. It is provided so as to be rotatable around the break point. Moreover, it is comprised so that a press state can also be changed by providing so that rotation is possible.

The fixing device 50 can be brought into contact with and separated from a fixing belt 52 formed of an endless belt, a fixing roller 51 and a heating roller 53 that span the fixing belt 52, and a portion of the fixing belt 52 that spans the fixing roller 51. The pressure roller 55 provided in the is provided. The fixing belt 52, the fixing roller 51 and the heating roller 53 that bridge the fixing belt 52 are arranged in the upper part of FIGS. 1 and 2, and the fixing belt 52 that spans the fixing roller 51. A pressure roller 55 provided so as to be able to contact and be separated is disposed in the lower part of the figure.
Then, when passing through the fixing nip formed between the portion of the fixing belt 52 wound around the fixing roller 51 and the pressure roller 55 in contact with it, heat and pressure are applied to perform secondary transfer. The color toner image thus formed is fixed on the form F.

A halogen lamp 54 as a heat source is disposed in the heating roller 53, and heats the fixing belt 52 spanned by the fixing roller 51.
The fixing roller 51 supports (hangs around) the fixing belt 52 when the heat of the fixing belt 52 and the pressure of the pressure roller 55 (force to press the form F against the fixing roller 51 side) are applied to the form F. Responsible for the reaction force of time. Further, it is provided to be rotated clockwise in the figure by a drive source such as a drive motor.
The pressure roller 55 is provided so as to be in contact with and separated from the portion of the fixing belt 52 that is stretched over the fixing roller 51 by the force of a driving source such as an actuator.
A fixing nip portion is formed between the portion of the fixing belt 52 wound around the fixing roller 51 and the pressure roller 55 in contact with the portion.

Due to the frictional force at the nip portion, the fixing belt 51 rotated by a driving source causes the fixing belt 52, the heating roller 53, and the pressure roller 55 to move on the surface, and the form F sandwiched between the fixing nip portions. Is conveyed toward the paper discharge roller pair 61 disposed on the downstream side in the conveyance direction.
In the fixing device 50, the temperature of the fixing belt 52 and the pressure roller 55, the nip width between the fixing belt 52 and the pressure roller 55, and the speed of the fixing roller 51, which are parameters of the fixing conditions, are changed according to the form F. . Specifically, the temperature of the halogen lamp 54 and the pressure roller 55 are set to the fixing roller 51 under the control of the main body control unit 80 according to the type of roll paper BR (form F) input from the display / operation unit 71 and the like. Change the force of the actuator that pushes toward the side.

The paper take-up device 301 includes a roll take-up unit 310, a paper take-in unit 320, a take-up loop detection sensor 331, a take-up control unit 380, and the like. Then, the form F discharged from the image forming apparatus 101 is taken in by the paper take-in unit 320 and taken up by the roll take-up unit 310 to obtain a take-up roll paper AR.
As the take-up loop detection sensor 331, for example, an optical sensor that receives reflected light of infrared light emitted toward the take-up loop detection mirror 332 provided on the side surface of the image forming apparatus 101 by a light receiving unit is used. be able to.

  By using such a take-up loop detection sensor 331, it is easily detected that the take-up loop 330 formed by the form F discharged from the image forming apparatus 101 has reached a lower position in the drawing than a predetermined position. be able to. Thus, the winding control unit 380 can appropriately control the drive source of the roll winding unit 310 that winds the discharged form F.

As described above, the roll paper BR fed by the feed roller unit 220 from the roll attachment unit 210 of the paper feed device 201 is fed into the guide resistance adding unit 110 of the image forming apparatus 101 via the feed loop 230. It becomes.
The taken-in form F is restricted in position and posture in the paper width direction orthogonal to the conveyance direction by the three shafts 111 and the end guide pairs 113 of the guide resistance adding unit 110, and is given conveyance resistance by the friction member 112. In this state, it is conveyed to the secondary transfer device 43.

On the other hand, the image forming apparatus 101 receives image data from an external device such as a personal computer, or, after receiving the image data, depresses a print start button of the display / operation unit 71 to output an image formation start signal. Upon receipt, rotation driving of the belt driving roller 44 by the driving motor is started. Then, the other plurality of rollers are also driven to rotate, and the intermediate transfer belt 42 starts to move (rotate).
At the same time, each image forming unit 21 forms a single color toner image on each photosensitive drum 1.
The single color toner images formed by the respective image forming units 21 are primary-transferred on the intermediate transfer belt 42 which is moving on the surface in order, and a composite color toner image is formed on the intermediate transfer belt 42. The

The form F taken into the image forming apparatus 101 is conveyed by the secondary transfer apparatus 43 so as to have the same speed as the intermediate transfer belt 42 carrying the composite color image on the intermediate transfer belt 42. The composite color toner image carried (formed) on the intermediate transfer belt 42 is secondarily transferred onto the surface of the form F conveyed to the secondary transfer device 43.
The form F after the secondary transfer of the composite color toner image is sent to the fixing device 50, where heat and pressure are applied to melt and fix the composite color toner image.
Thereafter, the form F is discharged from the image forming apparatus 101 by the pair of paper discharge rollers 61, taken into the paper take-up device 301 by the paper take-up unit 320 through the take-up loop 330, and taken up by the roll take-up unit 310. It is done.

Next, the flow of the operation of the paper conveyance related part related to the printing operation (image forming operation) by the image forming apparatus 101 will be described with reference to FIG.
FIG. 3 is a flowchart of the operation of the paper conveyance related part from the start to the end of printing of the image forming apparatus 101.

First, the procedure for setting the form F before starting printing will be described.
The delivery roll paper BR is set in the paper delivery device 201. Next, with the feed loop 230 formed below the predetermined position, the form F is passed through the guide resistance adding unit 110, the transfer unit 40, the fixing device 50, and the paper discharge roller pair 61 of the image forming apparatus 101. Then, the form F is set in the paper winding device 301 in a state where the winding loop 330 is formed below the predetermined position.

Here, when the form F is set in the image forming apparatus 101, at least the friction member 112 of the guide resistance adding unit 110 is set in a state of being separated from the second shaft 111b. The secondary transfer roller 43a of the secondary transfer device 43 is also set in a state of being separated from the intermediate transfer belt 42 wound around the secondary transfer counter roller 43b. Further, the pressure roller 55 of the fixing device 50 is also set in a state of being separated from the fixing belt 52 wound around the fixing roller 51.
When the paper feeding device 201, the guide resistance adding unit 110 of the image forming apparatus 101, the transfer unit 40, the fixing device 50, and the paper discharge roller pair 61 have been set, the next setting operation is performed manually or displayed / operated. This is automatically performed based on an operation from the unit 71.

The friction member 112 of the guide resistance adding unit 110 is moved (rotated) to the second shaft 111b side to a position where the friction member 112 is pressed with a predetermined pressure according to the type of the delivery roll paper BR (form F). And the second shaft 111b sandwich the form F.
The position of the friction member 112 with respect to the second shaft 111b when performing this setting operation is held so as not to move during the conveyance of the form F, and the next setting operation for the delivery roll paper BR or the next conveyance is performed. Sometimes it is not moved until the type of form F and the paper thickness change.

After the set operation described above is completed, when the operator (user) presses the print start button of the display / operation unit 71 (S101), the image forming apparatus 101 performs a pre-printing adjustment operation (S102).
As pre-printing adjustment operations, operations related to various bias settings in the tandem image forming unit 20 and the transfer unit 40, cleaning operations of the photosensitive drums 1 and the intermediate transfer belt 42, and energization of the halogen lamp 54 in the fixing device 50 are performed. For example, preheating by.

When the pre-printing adjustment operation is completed (S102), the fixing belt 52 and the pressure roller 55 wound around the fixing roller 51 of the fixing device 50 are brought into contact with each other (S103), and the conveyance of the form F is started. Then, the fixing roller 51 is accelerated to a predetermined set reference speed (S104).
Here, at this timing, the secondary transfer roller 43a is not in contact with the intermediate transfer belt 42, and the pulse period T of the encoder 75 (secondary transfer roller 43a) cannot be measured. The roller 51 is accelerated to the rotational speed of the driving source.

When the fixing roller 51 is accelerated to a predetermined set reference speed, the secondary transfer roller 43a, which is a driven roller, is brought into contact with the intermediate transfer belt 42 wound around the secondary transfer counter roller 43b via the form F ( S105). Due to this contact, the secondary transfer roller 43a is driven to rotate with the movement of the form F conveyed by the fixing device 50, and measurement of the pulse period: T of the encoder 75 is started (S106).
Next, it is determined whether or not the pulse period measured by the encoder 75 (hereinafter referred to as a measurement pulse period): T is equal to the set linear velocity pulse period (hereinafter referred to as the set pulse period): T0. Perform (S107). If it is determined by this determination that the measurement pulse cycle T is the set pulse cycle T0 (YES in S107), a printing operation, that is, image printing is started (S109).

On the other hand, when it is determined that the measurement pulse cycle T is not the set pulse cycle T0 (NO in S107), the following feedback control (adjustment) of the rotation speed of the fixing roller 51 of the fixing device 50 is performed. (S108).
Feedback control for accelerating the fixing roller 51 of the fixing device 50 when the measurement pulse period T is long with respect to the set pulse period T0, and decelerating the fixing roller 51 when the measurement pulse period T is short. It is.
Then, it is determined again whether or not the measurement pulse cycle T is the set pulse cycle T0 (S107). If it is determined that the measurement pulse cycle T is the set pulse cycle T0, image printing is performed. Start (S109).
The determination of whether or not the measurement pulse period T is the set pulse period T0 (S107), and feedback control of the rotation speed of the fixing roller 51 (S108) include the measurement pulse period T being the set pulse period: Repeat until T0.

Here, there is a variation in the sheet conveyance speed due to variations in the shapes of the fixing roller 51, the fixing belt 52, the pressure roller 55, and the like of the fixing device 50 due to an increase in the fixing temperature during printing. For this reason, even after image printing is started (S109), after a predetermined time t has elapsed (S110), it is determined whether or not the measurement pulse cycle T is the set pulse cycle T0 (S111).
If it is determined in this determination that the measurement pulse period T is the set pulse period T0 (YES in S111), it is determined whether or not to continue image printing, that is, printing (S112).
If it is determined that printing is to be continued (YES in S112), after a predetermined time t has elapsed (S113), the process returns to the determination of whether or not the measurement pulse cycle T is the set pulse cycle T0 (S111). ).

On the other hand, if it is determined not to continue printing (NO in S112), the secondary transfer roller 43a is separated from the form F (S115), and then the rotation of the fixing roller 51 is stopped to convey the form F (paper conveyance). Is stopped (S116). When the conveyance of the form F is stopped, the pressure roller 55 is separated from the fixing belt 52 wound around the fixing roller 51 of the fixing device 50 (S117), and the sheet conveyance related to the printing operation by the image forming apparatus 101 is performed. A series of movements of the part ends.
That is, when printing is finished, the secondary transfer roller 43a is separated, the rotation of the fixing roller 51 is stopped to stop the sheet conveyance, and finally, the fixing belt 52 and the pressure roller 55 are separated from each other. A series of operations related to the paper conveyance related portion related to the printing operation by the user 101 is completed.

Further, when it is determined that the measurement pulse cycle T after the elapse of the predetermined time t from the start of image printing is not the set pulse cycle T0 (NO in S111), the following fixing roller of the fixing device 50 is used. The feedback control of the rotational speed of 51 is performed (S114).
Feedback control for accelerating the fixing roller 51 of the fixing device 50 when the measurement pulse period T is long with respect to the set pulse period T0, and decelerating the fixing roller 51 when the measurement pulse period T is short. It is.
Then, it is determined again whether or not the measurement pulse cycle T is the set pulse cycle T0 (S111). If it is determined that the measurement pulse cycle T is the set pulse cycle T0, the printing is continued. The process proceeds to determination of whether or not to perform (S112).
The determination of whether or not the measurement pulse period T is the set pulse period T0 (S111), and the feedback control of the rotation speed of the fixing roller 51 (S114), the measurement pulse period T is the set pulse period: Repeat until T0.

Next, the reason why the image forming apparatus 101 of the present embodiment can suppress the slack of the form F and the occurrence of excessive tension will be described with reference to FIG.
As shown in FIG. 2, the guide resistance adding unit 110, the secondary transfer device 43, and the fixing device 50 are arranged in this order from the upstream side in the form F conveyance direction on the form F conveyance path in the image forming apparatus 101. A configuration relating to the conveyance of the form F is arranged.

Then, the form F is conveyed by rotationally driving the fixing roller 51 of the fixing device 50 in a state where the conveyance resistance is added by the friction member 112 of the guide resistance adding unit 110. By conveying in this way, tension can be applied to the foam F between the guide resistance adding unit 110 and the fixing device 50.
Further, since the secondary transfer roller 43a is a driven roller, the tension is increased due to a rotational load on the form F when it is in contact with printing, and the tension of the form F by the friction member 112 increases, so that it does not loosen.
Further, even when the rotational speed of the fixing roller 51 fluctuates and decelerates, if the form F is conveyed, tension can be applied by the friction member 112 and it does not become slack.

  Here, when both the fixing device 50 and the secondary transfer roller 43a have a driving roller, a constant speed is maintained while accelerating / decelerating each other in order to perform a constant rotation control. However, in particular, the fixing roller 51, which is the driving roller of the fixing device 50, is decelerated and the secondary transfer roller 43a is accelerated.

The secondary transfer roller 43 a includes an encoder 75. Therefore, if the secondary transfer roller 43a is in contact with the intermediate transfer belt 42 directly or via the form F, the measurement pulse period T of the secondary transfer roller 43a by the encoder 75 can be measured. It becomes possible.
The encoder 75 is configured to measure one or more signals by a sensor while the secondary transfer roller 43a rotates once, thereby measuring a pulse with a constant period from the secondary transfer roller 43a.
Since the measurement pulse period T measured in this way is used to accelerate or decelerate the fixing device 50 depending on whether it is longer or shorter than the set pulse period T0, the set linear speed can be maintained. Therefore, the secondary transfer device 43 is not pulled by the fixing device 50.

Next, the reason why the occurrence of meandering of the form F can be suppressed in the image forming apparatus 101 of the present embodiment will be described with reference to FIGS.
FIG. 4 is an explanatory diagram showing the reason why the occurrence of meandering of the form F can be suppressed, and is a view of the conveyance-related portion of the form F from the guide resistance adding unit 110 to the fixing nip portion of the fixing device 50 as viewed from above. .

First, the reason why meandering can be prevented by adopting a configuration in which the foam F between the transfer nip portion of the secondary transfer device 43 and the fixing nip portion of the fixing device 50 is not loosened will be described.
In the state where the conveyance resistance by the friction member 112 is added to the form F, tension is applied to the form F by the conveyance force when the fixing roller 51 of the fixing device 50 is rotationally driven.
Further, the position and posture (inclination) of the form F are determined (restricted) by fixing the edge (end) position of the form F by the end guide pair 113 as shown in FIG. .

Here, as shown in FIG. 2, the first shaft 111a, the second shaft 111b, and the second shaft 111b, which are the three shafts 111 shifted in the vertical direction, are wound around the second shaft 111b. A U-shaped part is formed with the bottom as the bottom. By forming such a U-shaped portion on the foam F, the length of the end of the foam F whose position is regulated by the end guide pair 113 is increased, and the bent portion of the U-shaped is By becoming a three-dimensional shape, the rigidity of the side surface of the foam F can be increased.
Thereby, it becomes a state which is hard to deform | transform with respect to the bending to the width direction of the form F, and even if the form F contacts the edge part guide pair 113, it becomes the structure which can suppress generation | occurrence | production of jam by the side surface of the form F deform | transforming. ing.

Next, the occurrence of meandering of a continuous recording material such as Form F will be described. Meandering is caused by the following mechanism.
Variations in the shape of each constituent member constituting the fixing device 50 and variations due to thermal expansion caused by heating of the fixing device 50 occur. Due to these variations, the right and left pressure balance between the fixing belt 52 and the pressure roller 55 in the width direction of the form F is lost in the fixing nip portion, which is the clamping portion of the fixing device 50, and the conveying force in the width direction of the form F is lost. And form F moves in the width direction.

On the other hand, the position and posture of the form F are determined by the guide resistance adding unit 110, and the form F is skewed by the fixing device 50 in a state where tension is applied by the added conveyance resistance and the driving force of the fixing device 50. The tension at the end of the foam F in the direction opposite to the direction to be increased increases.
By increasing in this way, when the component in the width direction of the form F is larger than the conveying force in the width direction, it acts as a restoring force to restore the conveying position of the form F, and the conveyance of the form F is stable. To do.
However, when the tension of the form F decreases between the transfer nip portion of the transfer device and the fixing nip portion of the fixing device 50, the restoring force also decreases, and the width of the form F in the width direction due to the variation of each component constituting the fixing device 50 is reduced. If it becomes smaller than the force, it will continue to skew, causing meandering or jamming.

Next, an example of a configuration for changing (adjusting) the conveyance resistance applied by the guide resistance addition unit 110 and releasing (eliminating) the conveyance resistance will be described with reference to FIG.
FIG. 5 is an explanatory diagram of the transport resistance adjusting mechanism 120 that changes the transport resistance applied by the guide resistance adding unit 110 and releases the transport resistance. 5A is an explanatory diagram when the conveyance resistance is applied by the conveyance resistance adjusting mechanism 120, and FIG. 5B is an explanatory diagram when the conveyance resistance is released by the conveyance resistance adjusting mechanism 120.

As described above, in the guide resistance adding unit 110, the pressing state of pressing the friction member 112 toward the second shaft 111b via the form F is changed, or the friction member 112 is separated from the second shaft 111b. The pressed state can be released.
In view of this, the image forming apparatus 101 according to the present exemplary embodiment includes the conveyance resistance adjusting mechanism 120 that changes the pressing state of the guide resistance adding unit 110 by the friction member 112 and releases the pressing state by the friction member 112.

As shown in FIG. 5, the conveyance resistance adjusting mechanism 120 includes a friction member 112, a rotation shaft 121 that is the rotation center of the friction member 112, a cam 122 that rotates the friction member 112, a cam shaft 123, and the friction member 112. Has a compression spring 124 that rotates in the direction in which the pressed state is released.
When a pressing state is applied to add conveyance resistance, as shown in FIG. 5A, the cam is arranged so that the friction member 112 rotates clockwise in the drawing against the urging force of the compression spring 124. 122 is rotated. On the other hand, when releasing the pressing state in which no conveyance resistance is applied, the cam 122 is rotated by the biasing force of the compression spring 124 so that the friction member 112 rotates counterclockwise in the drawing.
Here, the surface of the foam F that the friction member 112 presses (contacts) is stretched so that the surface (upper surface) of the foam F, which is a label sheet, is in contact with the outer peripheral surface of the second shaft 111b. This is the rear surface of F, that is, the surface of the release paper on which no image is formed. For this reason, the friction member 112 presses the form F so that the image forming surface of the form F is not affected.

That is, the friction member 112 of the guide resistance adding unit 110 is pressed toward the second shaft 111b that is laid around so that the image forming surface of the form F is in contact with the outer peripheral surface, and the second shaft 111b side. It is possible to change to a pressed release state separated from the.
Thus, the following effects can be produced by configuring the guide resistance adding unit 110.
When it is possible to improve the workability when setting the foam F to the guide resistance adding unit 110 and it is not necessary to add the conveyance resistance by the friction member 112 to the foam F depending on the type and thickness of the foam F, The pressed state can be released.

Further, the conveyance resistance adjusting mechanism 120 rotates the cam 122 within a range in which the pressing state of the form F by the friction member 112 is not released from the state of FIG. The pressing force can be changed.
Here, in the conveyance resistance adjusting mechanism 120, the cam shaft 123 that rotates the cam 122 is rotated by the display / operation unit 71 based on the type and thickness information of the form F that is input. The drive source is connected.

That is, the image forming apparatus 101 includes a display / operation unit 71 for inputting information on the type and thickness of the form F. Then, the friction member 112 is pressed toward the second shaft 111b that is routed so that the image forming surface of the form F contacts the outer peripheral surface based on the information on the form F input from the display / operation unit 71. The pressing state (pressing force) when being performed can be changed.
Thus, by configuring the image forming apparatus 101, the following effects can be obtained.
By changing to the pressed state according to the type and thickness of the form F, it is possible to transfer the foam F satisfactorily by adding a conveyance resistance according to the type and thickness of the form F.
Therefore, when forming an image on the form F, it is possible to more suitably suppress the slack of the form F between the secondary transfer device 43 and the fixing device 50 and the occurrence of jamming due to meandering accumulation.

  Here, as described above, the position of the friction member 112 with respect to the second shaft 111b is held so as not to move during the conveyance of the form F, and the next setting operation of the delivery roll paper BR or the next conveyance is performed. Sometimes it is not moved until the type of form F and the paper thickness change.

As described above, the image forming apparatus 101 according to the present embodiment sandwiches the color toner image formed (supported) on the intermediate transfer belt 42 between the intermediate transfer belt 42 and is conveyed. A secondary transfer roller 43a of the secondary transfer device 43 for transferring the image on the upper side is provided. Further, a fixing device 50 for fixing the toner image secondarily transferred while being nipped and conveyed to the form F is also provided.
The image forming apparatus 101 can use, as the form F, the form F sent out from the delivery roll paper BR having a length in the transport direction longer than the transport path of the form F in the image forming apparatus 101.
And the following guide resistance addition part 110 is provided in the conveyance direction upstream of the form F of the secondary transfer roller 43a. An end guide pair 113 that regulates the position and posture in the width direction of the form F, and a friction member 112 that adds a resistance force that resists the conveying force of the fixing device 50 transmitted from the downstream side in the conveying direction via the form F. The guide resistance adding unit 110 is provided.

With this configuration, the image forming apparatus 101 can achieve the following effects.
With the friction member 112 of the guide resistance adding unit 110 provided on the upstream side in the conveyance direction of the form F of the secondary transfer roller 43a and the fixing device 50, with the conveyance resistance applied, the fixing device 50 or the secondary transfer roller 43a The conveyance force by the fixing device 50 can be applied to the form F.
For this reason, it is possible to suppress at least the slack of the form F between the friction member 112 of the guide resistance adding portion 110 and the secondary transfer roller 43a, and the meandering of the form F due to the slack of the form F occurring in this section. Accumulation can be reduced.

In addition, by restricting the position and posture of the form F in the width direction with the end guide pair 113 of the guide resistance addition unit 110 provided on the upstream side in the conveyance direction of the form F of the secondary transfer roller 43a and the fixing device 50, Accumulation of meandering of Form F can be further reduced. Thereby, the occurrence of jam due to meandering accumulation can be suppressed.
Therefore, it is possible to provide the image forming apparatus 101 that can suppress the occurrence of a jam due to the meandering accumulation of the form F even when the image is formed on the form F.

Further, in the image forming apparatus 101 of the present embodiment, the secondary transfer device 43 includes a secondary transfer roller 43a that is driven to rotate while sandwiching the form F with the intermediate transfer belt 42 during the secondary transfer. .
According to this, by rotating the secondary transfer roller 43a in a driven manner, the form F between the secondary transfer device 43 and the fixing device 50 can be prevented from loosening more reliably. For this reason, the conveyance position of the foam F can be maintained by the force acting on the foam F in the width direction of the foam F, and the meandering accumulation of the foam F and the occurrence of jam can be more reliably suppressed.

Further, in the image forming apparatus 101 of the present embodiment, the fixing device 50 has a fixing roller 51 as a driving roller for conveying the form F, and the secondary transfer device 43 forms the form with the intermediate transfer belt 42 when transferring. A secondary transfer roller 43a that sandwiches F is provided. Then, the rotation speed of the fixing roller 51 is controlled by the main body control unit 80 or the like based on the measurement pulse cycle: T of the secondary transfer roller 43a.
According to this, by controlling the rotation speed of the fixing roller 51 included in the fixing device 50 based on the rotation period of the secondary transfer roller 43a, the influence of disturbance caused by heat applied to the recording material by the fixing device 50 is achieved. Thus, it is possible to control the rotation speed of the fixing roller 51 in which the above is reduced (eliminated).
Further, the measurement pulse cycle: T of the driven secondary transfer roller 43a can be measured, and the rotation speed of the fixing roller 51 included in the fixing device 50 can be feedback controlled so that the set pulse cycle: T0.

In addition, the guide resistance adding unit 110 of the image forming apparatus 101 according to the present embodiment has a first shaft 111a, a second shaft 111b, and a third shaft that span the form F as a guide member so that a U-shaped portion is formed. It has a shaft 111c. The guide member also includes an end guide pair 113 that regulates the position in the width direction of the form F so as to sandwich the U-shaped portion from the width direction of the form F. When conveying the form F by the fixing roller 51 provided in the fixing device 50, the friction member 112 is directed toward the second shaft 111b that is wound around such that the image forming surface such as the surface of the form F is in contact with the outer peripheral surface. It is pressed.
According to this, by forming the U-shaped portion in the form F, the length of the end portion of the form F whose position is regulated by the end portion guide pair 113 is increased and the U-shaped portion is bent into the U shape. Since the portion has a three-dimensional shape, the rigidity of the side surface of the foam F can be increased.

  Further, the image forming apparatus 101 according to the present embodiment separates the friction member 112 from the second shaft 111b of the guide resistance adding unit 110 that is wound around so that the image forming surface of the form F is in contact with the outer peripheral surface. The next transfer roller 43 a is separated from the intermediate transfer belt 42. In this state, the form F is set in the image forming apparatus 101 in a state where the fixing devices 50 abut against each other via the form F and the fixing roller 51 (fixing belt 52) is separated from the pressure roller 55. It is configured.

According to this, the following effects can be produced.
It becomes easy to set the form F in the image forming apparatus 101. In order to perform a pre-printing preparatory operation, the secondary transfer roller 43 a is separated from the intermediate transfer belt 42 after the form F is set in the image forming apparatus 101, and the fixing roller 51 is separated from the pressure roller 55. There is no need.
For these reasons, it is possible to shorten the time required to set the form F in the image forming apparatus 101 and start the image forming operation.

In addition, when the pre-printing preparatory operation is completed, the image forming apparatus 101 according to the present embodiment brings the fixing roller 51 and the pressure roller 55 into contact and then contacts the intermediate transfer belt 42 with the secondary transfer roller 43a. In the meantime, rotation driving of the fixing roller 51 is started. The rotation speed of the fixing roller 51 is controlled so as to accelerate to a preset reference speed of a driving source such as a driving motor for the fixing roller 51 set in advance. After the secondary transfer roller 43a is brought into contact with the intermediate transfer belt 42, the rotation speed of the fixing roller 51 is controlled based on the rotation cycle of the secondary transfer roller 43a while image formation is continued. Control is performed at predetermined time intervals such as after the elapse of time t.
According to this, the following effects can be produced.
Compared to the configuration in which the rotation of the fixing roller 51 is started after the secondary transfer roller 43a is brought into contact with the intermediate transfer belt 42, the acceleration is accelerated to a preset reference speed of the driving source of the fixing roller 51. The time required to start the image forming operation can be shortened by the time required.

  Here, the printing press 100 that is the image forming system of the present embodiment includes the above-described image forming apparatus 101 of the present embodiment, and thus can achieve the same effect.

As described above, the present embodiment has been described with reference to the drawings. However, the specific configuration is not limited to the configuration including the image forming apparatus 101 of the present embodiment described above, and the scope of the present invention is not deviated. Design changes may be made.
For example, the above-described image forming apparatus 101 according to the present embodiment is configured to transfer a color toner image formed on the intermediate transfer belt 42 to the form F, but the single color formed on the plurality of photosensitive drums 1. A configuration in which the toner image is directly transferred onto the form F may be used.
The present invention can also be applied to a monochrome image forming apparatus.

In the image forming apparatus 101 of the present embodiment described above, the configuration in which the fixing roller 51 is provided as the driving roller of the fixing device 50 has been described. However, the configuration is not limited to such a configuration.
For example, the present invention can be applied to a configuration in which the pressure roller 55 is provided as a drive roller, or the fixing roller 51 and the pressure roller 55 are both provided as drive rollers.

What was demonstrated above is an example, and there exists an effect peculiar for every following aspect.
(Aspect A)
A recording material such as Form F (feeding roll paper BR) conveyed by holding a toner image such as a color toner image formed on an image carrier such as the intermediate transfer belt 42 between the image carrier. Image formation comprising transfer means such as a secondary transfer roller 43a of the secondary transfer device 43 for transferring the image onto the recording material, and fixing means such as a fixing device 50 for fixing the toner image transferred while being nipped and conveyed to the recording material. In an image forming apparatus such as the apparatus 101, a continuous recording material such as Form F (feed roll paper BR) having a length in the transport direction longer than the recording material transport path in the image forming apparatus can be used as the recording material. A guide member such as an end guide pair 113 for regulating a width direction position and posture of the continuous recording material on the upstream side of the recording material conveyance path in the conveyance direction of the transfer unit; and the recording material A guide resistance adding portion 110 having a friction member such as a friction member 112 for applying a resistance force against a conveyance force such as a conveyance force of the fixing device 50 transmitted from the downstream side in the feeding direction through the continuous recording material. The guide resistance adding portion is provided.

According to this, as described in the present embodiment, the following effects can be achieved.
A friction member of a guide resistance adding portion provided on the upstream side in the recording material conveyance direction of the transfer unit and the fixing unit. With a conveyance resistance applied to the continuous recording material, the recording material conveyance force by the fixing unit or the transfer unit and the fixing unit Can be applied to the continuous recording material. For this reason, it is possible to suppress the occurrence of slack in the recording material between at least the friction member of the guide resistance adding portion and the transfer means, and it is possible to reduce the meandering accumulation of the continuous recording material due to the slack in the recording material occurring in this section.
In addition, the meandering of the continuous recording material is accumulated by regulating the width direction position and posture of the continuous recording material with the guide member of the guide resistance adding portion provided on the upstream side in the recording material conveyance direction of the transfer unit and the fixing unit. This can be further reduced and jamming due to meandering accumulation can be suppressed.
Therefore, it is possible to provide an image forming apparatus capable of suppressing the occurrence of jam due to the meandering accumulation of the continuous recording material even when the image is formed on the continuous recording material.

(Aspect B)
In (Aspect A), the transfer unit includes a transfer roller such as a secondary transfer roller 43a that is driven to rotate while sandwiching the recording material with the image carrier when transferring. .
According to this, as described in the present embodiment, the following effects can be achieved.
By rotating the transfer roller in a driven manner, the continuous recording material between the transfer unit and the fixing unit can be prevented from loosening more reliably. For this reason, the recording material conveyance position can be maintained by the force acting on the continuous recording material in the recording material width direction, and the meandering accumulation and jamming of the continuous recording material can be more reliably suppressed.

(Aspect C)
In (Aspect A) or (Aspect B), the fixing unit includes a driving roller such as a fixing roller 51 that conveys the recording material, and the transfer unit records the recording with the image carrier when transferring. It has a transfer roller such as a secondary transfer roller 43a that sandwiches the material, and the rotation speed of the drive roller is controlled by the main body control unit 80 or the like based on the rotation period of the transfer roller.

According to this, as described in the present embodiment, the following effects can be achieved.
By controlling the rotation speed of the drive roller in the fixing unit based on the rotation period of the transfer roller, the rotation speed of the drive roller reduces (eliminates) the influence of disturbance caused by heat applied to the recording material by the fixing unit. Can be controlled.
In addition, the rotation period of the driven transfer roller such as the measurement pulse period: T can be measured, and the rotation speed of the driving roller included in the fixing unit is feedback-controlled so that the set rotation period becomes a reference rotation period such as T0. be able to.

(Aspect D)
In any one of (Aspect A) to (Aspect C), the guide resistance adding portion is a first shaft 111a and a second shaft that span the continuous recording material so that a U-shaped portion is formed as a guide member. The position of the continuous recording material in the recording material width direction is such that three or more shaft members such as 111b and the third shaft 111c and the U-shaped portion are sandwiched from the recording material width direction such as the width direction of the form F. An end guide pair such as an end guide pair 113 to be regulated is provided, and when the friction member conveys the continuous recording material by a driving roller provided in the fixing unit, the surface (upper surface) of the continuous recording material, etc. The image forming surface is pressed toward a shaft member such as the second shaft 111b that is wound around so as to be in contact with the outer peripheral surface.

According to this, as described in the present embodiment, the following effects can be achieved.
By forming the U-shaped part on the continuous recording material, the length of the end of the continuous recording material whose position is regulated by the end guide pair is increased, and the U-shaped part is three-dimensional. By using a simple shape, the rigidity of the side surface of the continuous recording material can be increased.
As a result, the continuous recording material is difficult to be deformed with respect to the bending in the width direction, and even if the continuous recording material comes into contact with the end guide pair, it is possible to suppress the occurrence of a jam due to the side surface of the continuous recording material being deformed. It has become.

(Aspect E)
In (Aspect D), the friction member included in the guide resistance adding portion is pressed toward a shaft member that is wound around so that an image forming surface of the continuous recording material contacts an outer peripheral surface; Further, it is possible to change to a pressed release state separated from the shaft member side.

According to this, as described in the present embodiment, the following effects can be achieved.
When it is possible to improve workability when setting the continuous recording material to the guide resistance addition part, and it is not necessary to add the conveyance resistance due to the friction member to the continuous recording material depending on the type and thickness of the continuous recording material The pressed state can be released.

(Aspect F)
In (Aspect D) or (Aspect E), the information processing apparatus includes input means such as a display / operation unit 71 for inputting information on the type and thickness of the continuous recording material, and the friction member is input from the input means. Based on the information of the continuous recording material, the pressing state when the image forming surface of the continuous recording material is pressed toward the shaft member that is routed so as to contact the outer peripheral surface can be changed. .

According to this, as described in the present embodiment, the following effects can be achieved.
By changing the pressing state according to the type and thickness of the continuous recording material, it is possible to convey the continuous recording material with good transport resistance according to the type and thickness of the continuous recording material.
Accordingly, when image formation is performed on a continuous recording material, it is possible to more suitably suppress the occurrence of slack in the recording material between the transfer unit and the fixing unit and the occurrence of jamming due to meandering accumulation.

(Aspect G)
In any one of (Aspect D) to (Aspect F), the friction member is separated from a shaft member that is routed so that an image forming surface of the continuous recording material contacts an outer peripheral surface of the guide resistance adding portion. The transfer unit is separated from the image carrier, and the fixing unit is in contact with each other via the continuous recording material, and is either a fixing roller 51 (fixing belt 52) of a member constituting a fixing nip portion, or the like. The continuous recording material is set on the image forming apparatus in a state where the continuous recording material is separated from the other of the pressure roller 55 and the like.

According to this, as described in the present embodiment, the following effects can be achieved.
In order to make it easy to set the continuous recording material in the image forming apparatus and to perform the pre-printing preparation operation, after the continuous recording material is set in the image forming apparatus, the transfer means is separated from the image carrier or the fixing nip portion is configured. There is no need to separate one of the members to be separated from the other.
For these reasons, it is possible to shorten the time until the continuous recording material is set in the image forming apparatus and the image forming operation is started.

(Aspect H)
In (Aspect G), when the pre-printing preparatory operation is completed, after the member constituting the fixing nip portion is brought into contact with the image carrier, the fixing unit is brought into contact with the fixing unit. Control of the rotational speed of the drive roller that starts rotational drive of the drive roller is performed to accelerate to a preset reference speed of a drive source of the drive roller that is set in advance, and the image carrier is While the image formation is continued after the fixing unit is brought into contact, the rotation speed of the drive roller is controlled by a feedback control based on the rotation cycle of the transfer roller for a predetermined time such as after a lapse of time t. It is characterized by being performed at intervals.

According to this, as described in the present embodiment, the following effects can be achieved.
Compared to the configuration in which the rotation of the driving roller included in the fixing unit is started after the transfer unit is brought into contact with the image carrier, it is required to accelerate to a preset reference speed of the driving source of the driving roller set in advance. The time until the image forming operation is started can be shortened by the time.

(Aspect I)
An image forming apparatus capable of forming an image on a continuous recording material such as Form F (delivery roll paper BR), a recording material delivery apparatus such as a paper delivery apparatus 201 for delivering the continuous recording material to the image forming apparatus, and the image formation In an image forming system such as a printing press 100 provided with at least one of recording material storage devices such as a roll winding unit 310 that winds and stores the continuous recording material discharged from the device. The image forming apparatus includes an image forming apparatus such as the image forming apparatus 101 of any one of (Aspect A) to (Aspect H).

  According to this, as described in the present embodiment, it is possible to provide an image forming system that can achieve the same effects as any of the image forming apparatuses of (Aspect A) to (Aspect H).

DESCRIPTION OF SYMBOLS 20 Tandem image forming part 21 Image forming unit 40 Transfer part 41 Primary transfer roller 42 Intermediate transfer belt 43 Secondary transfer device 43a Secondary transfer roller 43b Secondary transfer counter roller 50 Fixing device 51 Fixing roller 52 Fixing belt 53 Heating roller 54 Halogen Lamp 55 Pressure roller 61 Paper discharge roller pair 71 Display / operation unit 75 Encoder 80 Main body control unit 100 Printing machine 101 Image forming apparatus 110 Guide resistance addition unit 111 Shaft 111a First shaft 111b Second shaft 111c Third shaft 112 Friction member 113 End guide pair 120 Conveyance resistance adjusting mechanism 121 Rotating shaft 122 Cam 123 Cam shaft 124 Compression spring 201 Paper feeding device 210 Roll attachment portion 220 Feeding roller portion 280 Feeding control portion 301 Paper winding device 310 Low Paper take-up unit 320 paper take-in unit 380 take-up control unit BR delivery roll paper AR take-up roll paper F form T measurement pulse period T0 set pulse period

JP 2014-137432 A

Claims (9)

Transfer means for nipping the toner image formed on the image carrier with the image carrier and transferring it onto the recording material being conveyed, and the toner image transferred while nipping and conveying to the recording material In an image forming apparatus provided with a fixing means for fixing,
As the recording material, a continuous recording material having a length in the transport direction longer than the recording material transport path in the image forming apparatus can be used.
A guide member for regulating the width direction position and posture of the continuous recording material on the upstream side in the transport direction of the transfer means on the recording material transport path and the downstream side in the recording material transport direction is transmitted via the continuous recording material. An image forming apparatus comprising: a guide resistance adding portion having a friction member that adds a resistance force that resists the conveying force. The image forming apparatus according to claim 1.
2. The image forming apparatus according to claim 1, wherein the transfer unit includes a transfer roller that is driven to rotate while sandwiching the recording material with the image carrier when transferring. The image forming apparatus according to claim 1, wherein
The fixing unit has a driving roller for conveying the recording material,
The transfer means has a transfer roller for sandwiching the recording material with the image carrier when transferring,
An image forming apparatus, wherein a rotation speed of the driving roller is controlled based on a rotation period of the transfer roller. The image forming apparatus according to any one of claims 1 to 3,
The guide resistance adding portion sandwiches the continuous recording material as a guide member so that a U-shaped portion is formed, and the U-shaped portion is sandwiched from the recording material width direction. A pair of end guides for regulating the position of the continuous recording material in the recording material width direction,
When the continuous recording material is conveyed by a driving roller provided in the fixing unit, the friction member is pressed toward a shaft member that is wound around so that an image forming surface of the continuous recording material contacts an outer peripheral surface. An image forming apparatus. The image forming apparatus according to claim 4.
The friction member included in the guide resistance adding portion includes a pressing state in which the image forming surface of the continuous recording material is pressed toward the shaft member that is wound around so as to contact the outer peripheral surface, and from the shaft member side. An image forming apparatus, wherein the image forming apparatus can be changed to a separated press release state. The image forming apparatus according to claim 4 or 5,
Input means for inputting information on the type and thickness of the continuous recording material,
The friction member is pressed toward a shaft member that is wound around so that the image forming surface of the continuous recording material contacts the outer peripheral surface based on the information of the continuous recording material input from the input unit. An image forming apparatus characterized in that the pressing state at the time can be changed. The image forming apparatus according to any one of claims 4 to 6,
Separating the friction member from a shaft member that is wound around such that the image forming surface of the continuous recording material contacts the outer peripheral surface of the guide resistance adding portion;
Separating the transfer means from the image carrier;
The continuous recording material is set in the image forming apparatus in a state in which one of the members constituting the fixing nip portion is in contact with each other through the continuous recording material of the fixing unit and separated from the other. An image forming apparatus. The image forming apparatus according to claim 7.
When the pre-printing preparatory operation is completed, after the member constituting the fixing nip portion is brought into contact, the drive roller included in the fixing unit is brought into contact with the image bearing member until the transfer unit is brought into contact. Start rotating drive,
The rotation speed of the drive roller is controlled so as to accelerate to a preset reference speed of the drive source of the drive roller,
While the image formation is continued after the transfer unit is brought into contact with the image carrier, the rotation speed of the drive roller is controlled based on the rotation period of the transfer roller for a predetermined time. An image forming apparatus, which is performed at intervals. An image forming apparatus capable of forming an image on a continuous recording material;
An image forming apparatus comprising: a recording material feeding device that feeds the continuous recording material to the image forming device; and a recording material storage device that stores the continuous recording material discharged from the image forming device. In the system,
An image forming system comprising the image forming apparatus according to claim 1 as the image forming apparatus.

Images