JP7338256B2 - Recording medium conveying device and image forming device - Google Patents

Description

The present disclosure relates to a recording medium conveying device and an image forming device.

2. Description of the Related Art In recent years, an inkjet image recording apparatus has been developed as an apparatus for recording high-definition images on various recording media. In particular, when the recording medium is a stretchable fabric or the like, the recording medium is conveyed below the recording head by an endless belt.

After ink is ejected onto the recording medium to form an image, the recording medium is peeled off, and another recording medium is supplied to the endless belt.

Due to ink strike-through or the like, the ink ejected from the recording head may adhere to the endless belt. In this case, the ink adhering to the endless belt adheres to the newly supplied recording medium, contaminating the recording medium.

In order to prevent such contamination, after the recording medium is peeled off, a washing liquid such as water is supplied to the endless belt to wash the endless belt. If the supplied cleaning liquid remains on the endless belt, it causes ink bleeding.

Therefore, the supplied cleaning liquid is removed by a removing member such as a blade as in Japanese Patent Application Laid-Open No. 2012-116619 (Patent Document 1), or is removed as described in Japanese Patent No. 5817736 (Patent Document 2). , or removed by a removing member such as a water absorbing roller.

In Patent Document 1, a plurality of blades are arranged along the rotation direction of the endless belt, and at least one blade among the plurality of blades can change the pushing amount, the contact angle, or the presence or absence of contact with the endless belt. It is configured. The conditions of these blades are changed according to the adhesive (adhesive) applied to the endless belt.

In Patent Document 2, cleaning conditions such as contact area and contact surface pressure are changed according to the properties of the adhesive.

JP 2012-116619 A Japanese Patent No. 5817736

However, although Patent Literature 1 and Patent Literature 2 disclose that various conditions are changed according to the properties of the adhesive, specific timing is not sufficiently considered.

The adhesive strength between the removal member and the endless belt due to the adhesive also changes depending on the operating conditions of the endless belt. When the adhesive force between the endless belt and the removing member increases, the removing member is temporarily pulled by the endless belt. When the pulled removing member returns to its original position due to the restoring force, the removing member is temporarily separated from the endless belt. At this time, the cleaning liquid adhering to the endless belt passes through the gap between the removing member and the endless belt.

The present disclosure has been made in view of the problems described above, and an object of the present disclosure is to provide a recording medium conveying device and an image forming device that can prevent the cleaning liquid from slipping through the removing member.

A recording medium conveying device based on the present disclosure includes an endless belt having a surface coated with an adhesive and conveying the recording medium by rotating while the recording medium is in close contact with the surface; and the endless belt. a cleaning liquid applying section for applying cleaning liquid to the surface; and a cleaning liquid applying section arranged downstream of the cleaning liquid applying section in the rotation direction of the endless belt, contacting the surface of the endless belt, and the cleaning liquid applied to the surface of the endless belt. A removal member that removes the cleaning liquid, a driving unit that intermittently drives the endless belt, and an adhesive strength adjusting mechanism that adjusts the adhesive strength between the endless belt and the removing member due to the adhesive. The adhesive force adjustment mechanism comprises a deceleration period during which the endless belt rotates at a predetermined constant speed until it stops, a stop period during which the endless belt is stopped, and a period during which the endless belt stops rotating. During at least one period of the acceleration period from the start until reaching a predetermined constant speed, an operation is performed so as to suppress the increase in the adhesive force accompanying the stop operation of the endless belt.

In the recording medium conveying device based on the present disclosure, the adhesive force adjusting mechanism may be configured to adjust a pressing force for pressing the removing member against the surface of the endless belt.

In the recording medium conveying device based on the present disclosure, the adhesive force adjustment mechanism adjusts the pressure contact force during the stop period more than the pressure contact force when the endless belt is rotating at the constant speed. Lower is preferred.

In the recording medium conveying device based on the present disclosure, the pressure contact force during the stop period is in the range of 30% or more and 80% or less of the pressure contact force when the endless belt is rotating at the constant speed. is preferred.

In the recording medium conveying device based on the present disclosure, the adhesive force adjustment mechanism may gradually reduce the pressure contact force during the deceleration period.

In the recording medium conveying device according to the present disclosure, the adhesive force adjustment mechanism may gradually increase the pressure contact force during the acceleration period.

In the recording medium conveying device based on the present disclosure, the adhesive force adjustment mechanism separates the removing member from the surface of the endless belt for a certain period of time during the stop period, and then the endless belt starts to accelerate. Before, the removing member may be brought into contact with the surface of the endless belt, and the pressing force may be gradually increased until the endless belt reaches a predetermined speed.

In the recording medium conveying device according to the present disclosure, the adhesive strength adjustment mechanism may be configured to cool the adhesive.

An image forming apparatus based on the present disclosure includes the recording medium conveying device, and an image forming section that forms an image on the recording medium in close contact with the endless belt.

In the image forming apparatus based on the present disclosure, it is preferable that the image forming section includes a head section that ejects ink toward the recording medium.

According to the present disclosure, it is possible to provide a recording medium conveying device and an image forming apparatus that can prevent the cleaning liquid from slipping through the removing member.

1 is a schematic diagram showing an image forming apparatus according to an exemplary embodiment; FIG. It is a figure which shows the rotation operation of the endless belt contained in the conveying apparatus which concerns on embodiment. FIG. 7 is a diagram showing the relationship between the elapsed time after the endless belt stops and the adhesive force between the endless belt and the removal member due to the adhesive in the conveying device according to the embodiment; FIG. 10 is a diagram showing changes in the pressing force of the removal member based on the first example of the operation of the adhesive force adjustment mechanism; FIG. 10 is a diagram showing changes in the pressing force of the removing member based on the second example of the operation of the adhesive force adjusting mechanism; FIG. 10 is a diagram showing changes in pressure contact force of the removing member based on a third example of the operation of the adhesive force adjustment mechanism; FIG. 10 is a diagram showing changes in the pressing force of the removal member based on the fourth example of the operation of the adhesive force adjustment mechanism; FIG. 12 is a diagram showing changes in the pressing force of the removing member based on the fifth example of the operation of the adhesive force adjusting mechanism; FIG. 14 is a diagram showing changes in the pressing force of the removing member based on the sixth example of the operation of the adhesive force adjusting mechanism; FIG. 14 is a diagram showing changes in the pressing force of the removal member based on the seventh example of the operation of the adhesive force adjustment mechanism; FIG. 20 is a diagram showing changes in pressure contact force of the removal member based on an eighth example of the operation of the adhesive force adjustment mechanism; FIG. 10 is a diagram showing a change in pressure contact force of the removal member when there is no adhesive force adjusting mechanism as a comparative example; FIG. 10 is a diagram showing the evaluation of passing through of cleaning liquid and the evaluation of wear of a removal member in Examples 1 to 8 and Comparative Example 1;

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments shown below, the same or common parts are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.

FIG. 1 is a schematic diagram showing an image forming apparatus according to an embodiment. An image forming apparatus 10 according to an embodiment will be described with reference to FIG.

As shown in FIG. 1 , the image forming apparatus 10 includes an image forming section 11 , a pressing roller 12 , a peeling roller 13 and a recording medium transporting device 20 .

The pressing roller 12 is arranged on the upstream side of the image forming section 11 in the rotation direction of the endless belt 21, which will be described later. The pressing roller 12 brings the supplied recording medium P into close contact with the surface of the endless belt 21 .

As the recording medium P, for example, paper, cloth, plastic film, or the like is used. The recording medium P may be in the form of a sheet that is cut into a predetermined size, or may be in the form of a long sheet that is continuously drawn out from a roll.

The image forming section 11 prints an image on the recording medium P in close contact with the surface of the endless belt 21 . The image forming section 11 includes a head section that ejects ink toward the recording medium P. As shown in FIG. The head section is filled with a coloring agent for printing.

The recording medium P on which an image has been formed by the image forming section 11 is conveyed toward the peeling roller 13 . The peeling roller 13 peels the recording medium P from the endless belt 21 .

The recording medium conveying device 20 includes an endless belt 21 , a driving roller 22 , a driven roller 23 , a driving source 24 , a control section 25 , a cleaning liquid applying section 26 , a removing member 27 , an adhesive force adjusting mechanism 28 and an absorbing member 29 .

An adhesive is applied to the surface of the endless belt 21 . The adhesive can adhere the recording medium P to the surface of the endless belt 21 . The adhesive is not particularly limited, but rubber-based adhesives containing natural rubber or synthetic rubber as a main component, acrylic-based adhesives, silicone-based adhesives, or the like can be used. The pressure-sensitive adhesive may be used by mixing one type or multiple types of materials. As the adhesive, a silicone-based adhesive (“Liquitac FS” manufactured by Dairyoku Co., Ltd.) or the like may be used.

The endless belt 21 is stretched over a drive roller 22 and a driven roller 23 . The drive roller 22 is rotationally driven by a drive source 24 . The operation of the drive source 24 is controlled by the controller 25 . As the drive roller 22 rotates, the endless belt 21 rotates in the arrow AR1 direction. The driven roller 23 is driven to rotate by the endless belt 21 .

The drive roller 22 and the drive source 24 function as a drive unit that drives the endless belt 21 to rotate. As will be described later, the drive unit intermittently drives the endless belt 21 when forming an image on a recording medium.

The cleaning liquid application unit 26 applies cleaning liquid to the surface of the endless belt 21 after the recording medium P has been peeled off. The cleaning liquid application unit 26 is composed of a water spray pipe provided with a water spray port, a pump, and the like. By applying the cleaning liquid to the surface of the endless belt 21, it is possible to clean the surface of the endless belt 21 to which ink has adhered during image formation.

The removing member 27 is arranged downstream of the cleaning liquid applying section 26 in the rotation direction of the endless belt 21 . The removing member 27 removes cleaning liquid adhering to the surface of the endless belt 21 . As a result, it is possible to prevent the liquid remaining on the surface of the endless belt 21 from adhering to the recording medium P newly supplied.

The removing member 27 has, for example, a blade shape. The material used for the removal member 27 is not particularly limited, but metal materials such as iron, steel, stainless steel, aluminum, and brass, as well as silicone rubber, soft PVC rubber, urethane rubber, fluororubber, chloroprene rubber, nitrile rubber, Elastic members such as ethylene propylene rubber and butyl rubber may be used. Urethane rubber is preferable from the viewpoint of abrasion resistance. The contact portion with the conveying member may have a rectangular cross-section, but may also have a shape in which the tip is obliquely cut off or a shape that tapers toward the tip.

The adhesive force adjusting mechanism 28 adjusts the adhesive force between the endless belt 21 and the removing member 27 by adhesive. Specifically, the adhesive force adjustment mechanism 28 adjusts the pressure contact force with which the removal member 27 is pressed against the surface of the endless belt 21 .

Adhesive force adjustment mechanism 28 is configured by, for example, an eccentric cam. By adjusting the amount of rotation of the eccentric cam, it is possible to adjust the pushing amount of pushing the removing member 27 toward the endless belt 21 . Thereby, the adhesive force adjusting mechanism 28 can adjust the pressure contact force. Note that the amount of rotation of the eccentric cam is controlled by the control section 25 . The adhesive force adjusting mechanism 28 may be an actuator that adjusts the pushing amount of the removing member 27 by applying voltage.

The absorbing member 29 is arranged downstream of the removing member 27 in the rotation direction of the endless belt 21 . The absorbing member 29 absorbs the cleaning liquid left unremoved by the removing member 27 . As the absorbing member 29, for example, a roller-shaped non-woven fabric of polyester or polyurethane wound around a rotating shaft, a sponge, or the like can be used. Note that the absorbing member 29 is not an essential member and can be omitted.

2A and 2B are diagrams showing the rotation operation of the endless belt included in the conveying device according to the embodiment. FIG. A rotation operation of the endless belt 21 according to the embodiment will be described with reference to FIG.

As shown in FIG. 2 , the endless belt 21 stops rotating when the recording medium P is transported to a position facing the image forming section 11 . The image forming section 11 forms an image in the image forming area of the recording medium P during the stop period. When an image is formed in the image forming area, the endless belt 21 rotates and conveys the recording medium P. As shown in FIG. Thus, the endless belt 21 is intermittently driven by the drive section.

Specifically, the endless belt 21 has a conveying period during which it rotates at a predetermined constant speed, a deceleration period during which the endless belt 21 rotates at a predetermined constant speed until it stops, and a period during which the endless belt 21 stops. It rotates so that a stop period and an acceleration period until it reaches a predetermined constant speed after starting rotation from the stop state are repeated in order.

It should be noted that the endless belt 21 rotates at 200 mm/s during the transport period. Also, the deceleration period is approximately 0.2 seconds. The stop period is approximately 2.0 seconds. The acceleration period is approximately 0.2 seconds.

FIG. 3 is a diagram showing the relationship between the elapsed time after the endless belt stops and the adhesive force between the endless belt and the removing member due to the adhesive in the conveying device according to the embodiment. In FIG. 3, the broken line shows the change in the adhesive force when the removing member is brought into contact with the endless belt with the same pressure as before the endless belt 21 stops, and the adhesive force in the present embodiment is shown by the broken line. An example of change in is shown by a solid line.

As shown in FIG. 3, when the removing member is brought into contact with the endless belt after the endless belt 21 stops with the same pressure as before the endless belt 21 stops, a considerable amount of pressure is applied to the adhesive, as indicated by the dashed line. The removing member 27 is in contact with the stopped endless belt 21 in an unloaded state. Under such circumstances, the viscosity of the adhesive increases. That is, the adhesive force increases as the endless belt 21 stops.

In the present embodiment, as shown in the first to eighth examples to be described later, the adhesive force adjustment mechanism 28 is configured to operate as described above during at least one of the deceleration period, the stop period, and the acceleration period. In addition, it operates to suppress the increase in the adhesive force due to the stopping operation of the endless belt 21 . As a result, as indicated by the solid line in FIG. 3, an increase in adhesive force is suppressed. In addition, the solid line in FIG. 3 indicates, as an example, the change in adhesive force in a first example described later.

4 to 11 are diagrams showing changes in the pressing force of the removing member based on the first to eighth examples of the operation of the adhesive force adjusting mechanism. The pressing force of the removing member is the pressing force with which the removing member 27 is pressed against the surface of the endless belt 21 .

As shown in FIG. 4, in the first example, the adhesive force adjustment mechanism 28 makes the contact force during the stop period lower than the contact force when the endless belt 21 is rotating at a constant speed. Specifically, the pressing force during the stop period is about 30% of the pressing force when the endless belt 21 rotates at a constant speed. The pressing force during the deceleration period and the acceleration period is approximately the same as the pressing force when the endless belt 21 rotates at a constant speed.

The pressure contact force when the endless belt is rotating at a constant speed is approximately 5 N/m, and the pressure contact force during the stop period is approximately 1.5 N/m.

In this case, the load on the adhesive can be reduced by reducing the contact pressure during the stop period. Thereby, an increase in adhesive strength can be suppressed. As a result, even when the endless belt 21 is rotated from the stopped state, the removing member 27 is prevented from returning to its original position after being pulled by the endless belt 21 .

In general, the removing member 27 is temporarily separated from the endless belt 21 when returning to its original position after being pulled by a large amount.

In the present embodiment, since the removal member 27 is prevented from being pulled by the endless belt 21, it is possible to prevent the removal member 27 from separating from the endless belt 21. As a result, it is possible to prevent the cleaning liquid from slipping between the removing member 27 and the endless belt 21 .

As shown in FIG. 5, in the second example, the adhesive force adjustment mechanism 28 gradually decreases the contact pressure during the deceleration period. As in the first embodiment, the pressing force during the stop period is 30% of the pressing force when the endless belt 21 rotates at a constant speed. The pressing force during the acceleration period is approximately the same as the pressing force when the endless belt 21 rotates at a constant speed.

Even in this case, as in the first example, by reducing the contact pressure during the stop period, it is possible to prevent the cleaning liquid from slipping between the removing member 27 and the endless belt 21 as described above. Furthermore, the load on the removing member 27 can be reduced by gradually lowering the pressing force of the removing member 27 during the deceleration period.

As shown in FIG. 6, in the third example, the adhesive force adjustment mechanism 28 gradually increases the contact pressure during the acceleration period. The pressing force at the start of acceleration is 30% of the pressing force when the endless belt 21 rotates at a constant speed, and the pressing force at the end of acceleration is the pressing force when the endless belt 21 rotates at a constant speed. equivalent to force. The pressing force during the deceleration period and the stopping period is approximately the same as the pressing force when the endless belt 21 rotates at a constant speed.

In this case, since the pressure contact force during the stop period is equivalent to the pressure contact force when the endless belt 21 is rotating at a constant speed, the adhesive force increases during the stop period.

However, by reducing the pressure contact force at the start of acceleration and gradually increasing it, it is possible to suppress the increase in adhesion force during the acceleration period. Therefore, also in the third example, it is possible to suppress an increase in the adhesive force due to the stopping operation of the endless belt 21 , thereby suppressing the pulling of the removing member 27 by the endless belt 21 . As a result, it is possible to prevent the cleaning liquid from slipping between the removing member 27 and the endless belt 21 .

As shown in FIG. 7, in the fourth example, the adhesive force adjustment mechanism 28 gradually reduces the contact pressure during the deceleration period. Also, the adhesive force adjustment mechanism 28 makes the pressure contact force during the stop period lower than the pressure contact force when the endless belt 21 is rotating at a constant speed. Furthermore, the adhesive force adjusting mechanism 28 gradually increases the contact pressure during the acceleration period.

Even in this case, as in the first example, by reducing the contact pressure during the stop period, it is possible to prevent the cleaning liquid from slipping between the removing member 27 and the endless belt 21 as described above. Furthermore, the load on the removing member 27 can be reduced by gradually decreasing the pressing force of the removing member 27 during the deceleration period and gradually increasing the pressing force of the removing member 27 during the acceleration period. .

As shown in FIG. 8, in the fifth example, the adhesive force adjustment mechanism 28 separates the removing member 27 from the surface of the endless belt 21 for a certain period of time during the stop period and before the endless belt 21 starts accelerating. The removal member 27 is brought into contact with the surface of the endless belt 21, and the pressing force is gradually increased until the endless belt 21 reaches a predetermined speed.

Specifically, the removing member 27 is separated from the endless belt 21 from the start of the stop period to 0.1 second before the end of the stop period. The removing member 27 is brought into contact with the endless belt 21 0.1 second before the end of the stop period, and the pressing force is gradually increased until the end of the acceleration period.

In this case, by separating the removing member 27 from the endless belt 21, a gap is temporarily formed between the removing member 27 and the surface of the endless belt 21. The endless belt 21 is contacted 0.1 second before. Therefore, it is possible to prevent the cleaning liquid remaining on the surface of the endless belt 21 from slipping through the gap between the removing member 27 and the surface of the endless belt 21 during the stop period.

Further, by gradually increasing the pressure contact force, it is possible to suppress the progress of the increase in the adhesive force during the acceleration period. Therefore, the removal member 27 is prevented from being pulled by the endless belt 21 . This also prevents the cleaning liquid from passing through between the removing member 27 and the endless belt 21 .

As shown in FIG. 9, in the sixth example, the pressing force during the stop period is changed as compared with the first example. The pressing force during the stop period is 10% of the pressing force when the endless belt 21 rotates at a constant speed.

Also in this case, it is possible to prevent the cleaning liquid from slipping between the removing member 27 and the endless belt 21, as in the first example.

As shown in FIG. 10, in the seventh example, the pressing force during the stop period is changed as compared with the first example. The pressing force during the stop period is 80% of the pressing force when the endless belt 21 rotates at a constant speed.

Also in this case, it is possible to prevent the cleaning liquid from slipping between the removing member 27 and the endless belt 21, as in the first example.

As shown in FIG. 11, in the eighth example, the pressing force during the stop period is changed as compared with the first example. The pressing force during the stop period is 90% of the pressing force when the endless belt 21 rotates at a constant speed.

In this case, although the effect of suppressing the increase in adhesive strength is lower than in the first example, it is possible to suppress the cleaning liquid from slipping through between the removing member 27 and the endless belt 21 .

As described above, in the recording medium conveying device 20 according to the embodiment and the image forming apparatus 10 including the same, during at least one of the deceleration period, the stop period, and the acceleration period, By operating the adhesive force adjusting mechanism so as to suppress an increase in adhesive force accompanying the stopping operation of the endless belt 21, it is possible to suppress the cleaning liquid from slipping through the removing member.

(Comparative example)
FIG. 12 is a diagram showing a change in pressure contact force of the removing member when there is no adhesive force adjusting mechanism as a comparative example. Unlike the recording medium conveying device 20 according to the embodiment, the recording medium conveying device according to the comparative example does not include the adhesive force adjusting mechanism 28 and constantly applies a constant pressing force to the endless belt 21 . Specifically, during the deceleration period, the stop period, and the acceleration period, the pressure contact force equivalent to the pressure contact force when the endless belt 21 rotates at a constant speed is applied.

In this case, the state in which a considerable degree of pressure is not applied to the adhesive is maintained even during the deceleration period, stop period, and acceleration period. As a result, the viscosity of the adhesive increases, and the adhesive force increases as the endless belt 21 stops.

Accordingly, when the endless belt 21 is rotated from the stopped state, the removing member 27 is largely pulled by the endless belt 21 . When the removing member 27 returns to its original position, the removing member 27 is temporarily separated from the endless belt 21 . At this time, the cleaning liquid adhering to the endless belt 21 passes through the gap between the removing member 27 and the endless belt 21 .

(Experimental result)
FIG. 13 is a diagram showing the evaluation of cleaning liquid penetration and the evaluation of abrasion of the removing member in Examples 1 to 8 and Comparative Example 1. FIG. With reference to FIG. 13, an evaluation of cleaning liquid slipping through and an evaluation of wear of the removal member, which were carried out to verify the effects of the embodiment, will be described.

As Examples 1 to 8, the operations of the adhesive force adjustment mechanism 28 in the above-described first to eighth examples were performed in the recording medium conveying device 10 according to the embodiment, and evaluations of slipping-through of the cleaning liquid and evaluations of wear of the removing member were performed. did That is, in Examples 1 to 8, the pressure contact force was changed in the manner shown in FIGS.

In addition, as Comparative Example 1, the recording medium conveying apparatus in the above Comparative Example was used to evaluate the passage of the cleaning liquid and the wear of the removal member. That is, as shown in FIG. 12, the pressure contact force was kept constant, and the pass-through evaluation of the purified liquid and the abrasion evaluation of the removal member were performed.

For the pass-through evaluation, the amount of cleaning liquid passing through the removing member 27 was checked, and the image quality formed on the recording medium after the endless belt 21 was cleaned was checked. At this time, the case where no cleaning liquid passed through the removing member 27 was confirmed was evaluated as good. The cleaning liquid passed through the removing member 27, but the image was not blurred by the cleaning liquid, and was evaluated as acceptable. On the other hand, when the cleaning liquid slipped through the removing member 27 and bleeding occurred in the image due to the cleaning liquid, it was evaluated as unsatisfactory.

As for the wear evaluation, it was confirmed whether or not abrasion marks were formed on the removing member 27, and whether or not the cleaning liquid slipping through the removing member due to wear affected the image quality formed on the recording medium after cleaning. At this time, the case where no wear marks were formed was evaluated as good. The image was evaluated as acceptable when bleeding due to the washing liquid could not be confirmed although abrasion marks were formed. On the other hand, when abrasion traces were formed and bleeding due to the cleaning liquid occurred on the image, it was evaluated as unsatisfactory.

As shown in FIG. 13, in Example 1, no cleaning liquid passed through the removing member 27 was observed. Moreover, no abrasion marks were found on the removal member 27 . Therefore, the slip-through evaluation of the removal member 27 in Example 1 was evaluated as good, and the wear evaluation was evaluated as good. Considering these slip-through evaluation and wear evaluation comprehensively, the overall evaluation was evaluated as good.

In Example 2, no cleaning liquid passed through the removing member 27 was confirmed. Moreover, no abrasion marks were found on the removal member 27 . For this reason, the slip-through evaluation of the removal member 27 in Example 2 was evaluated as good, and the wear evaluation was evaluated as good. Considering these slip-through evaluation and wear evaluation comprehensively, the overall evaluation was evaluated as good.

In Example 3, although the cleaning liquid passed through the removing member 27 was confirmed, bleeding due to the cleaning liquid could not be confirmed in the image. Moreover, no abrasion marks were found on the removal member 27 . Therefore, the slip-through evaluation of the removing member 27 in Example 3 was evaluated as good, and the wear evaluation was evaluated as good. In consideration of these slip-through evaluations and wear evaluations comprehensively, the overall evaluation was evaluated as acceptable.

In Example 4, no cleaning liquid passed through the removing member 27 was confirmed. Moreover, no abrasion marks were found on the removal member 27 . Therefore, the slip-through evaluation of the removal member 27 in Example 4 was evaluated as good, and the wear evaluation was evaluated as good. Considering these slip-through evaluation and wear evaluation comprehensively, the overall evaluation was evaluated as good.

In Example 5, although the cleaning liquid passed through the removing member 27 was confirmed, bleeding due to the cleaning liquid could not be confirmed in the image. Moreover, no abrasion marks were found on the removal member 27 . Therefore, the slip-through evaluation of the removal member 27 in Example 5 was evaluated as good, and the wear evaluation was evaluated as good. In consideration of these slip-through evaluations and wear evaluations comprehensively, the overall evaluation was evaluated as acceptable.

In Example 6, no washing liquid passed through the removing member 27 was observed. Further, although wear marks were confirmed on the removing member 27, bleeding due to the cleaning liquid could not be confirmed on the image. Therefore, the slip-through evaluation of the removal member 27 in Example 4 was evaluated as good, and the wear evaluation was evaluated as acceptable. In consideration of these slip-through evaluations and wear evaluations comprehensively, the overall evaluation was evaluated as acceptable.

In Example 7, no washing liquid passed through the removing member 27 was observed. Moreover, no abrasion marks were found on the removal member 27 . Therefore, the slip-through evaluation of the removal member 27 in Example 7 was evaluated as good, and the wear evaluation was evaluated as good. Considering these slip-through evaluation and wear evaluation comprehensively, the overall evaluation was evaluated as good.

In Example 8, although the cleaning liquid passed through the removing member 27 was confirmed, bleeding due to the cleaning liquid could not be confirmed in the image. Moreover, no abrasion marks were found on the removal member 27 . Therefore, the slip-through evaluation of the removal member 27 in Example 8 was evaluated as good, and the wear evaluation was evaluated as good. In consideration of these slip-through evaluations and wear evaluations comprehensively, the overall evaluation was evaluated as acceptable.

In Comparative Example 1, it was confirmed that the cleaning liquid slipped through the removing member 27, and bleeding of the image due to the cleaning liquid was confirmed. Further, although wear marks were confirmed on the removing member 27, bleeding due to the cleaning liquid could not be confirmed on the image. Therefore, the slip-through evaluation of the removal member 27 in Comparative Example 1 was evaluated as not acceptable, and the wear evaluation was evaluated as good. Comprehensively considering these pass-through evaluation and wear evaluation, the overall evaluation was evaluated as unsatisfactory.

From the above results, as in Examples 1 to 8, during at least one of the deceleration period, the stop period, and the acceleration period, the increase in the adhesive force accompanying the stop motion of the endless belt 21 was suppressed. , it was confirmed that the operation of the adhesive force adjustment mechanism can suppress the cleaning liquid from slipping through the removing member.

Further, by comparing the results of Examples 1, 6, 7, and 8 with the results of Comparative Example 1, the pressure contact force during the stop period is greater than the pressure contact force when the endless belt is rotating at a constant speed. It was confirmed that the range of 10% or more and 90% or less is preferable, and the range of 30% or more and 80% or less is more preferable. By making it within the range of 30% or more and 80% or less, slip-through can be suppressed, and wear of the removal member 27 can also be suppressed.

In addition, in the above-described embodiment, the case where the pressure contact force is adjusted as an adhesive force adjusting mechanism has been exemplified and explained, but the present invention is not limited to this, and the temperature of the adhesive may be adjusted. In this case, the adhesive strength adjusting mechanism is configured to be able to cool the adhesive. For example, a Peltier element can be used as the adhesive force adjusting mechanism.

As described above, the embodiments and examples disclosed this time are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the scope of claims, and includes all modifications within the meaning and scope of equivalence to the scope of claims.

REFERENCE SIGNS LIST 10 image forming apparatus 11 image forming unit 12 pressing roller 13 peeling roller 20 recording medium conveying device 21 endless belt 22 driving roller 23 driven roller 24 driving source 25 control unit 26 cleaning liquid applying unit 27 Removing member 28 Adhesion adjusting mechanism 29 Absorbing member.

Claims (7)

an endless belt that has a surface coated with an adhesive and rotates while the recording medium is in close contact with the surface to convey the recording medium;
a cleaning liquid applying unit that applies cleaning liquid to the surface of the endless belt;
a removing member arranged downstream of the cleaning liquid application section in the rotation direction of the endless belt, contacting the surface of the endless belt, and removing the cleaning liquid adhering to the surface of the endless belt;
a driving unit for intermittently driving the endless belt;
an adhesive force adjustment mechanism that adjusts the adhesive force between the endless belt and the removing member by the adhesive,
The adhesive force adjustment mechanism comprises a deceleration period during which the endless belt is rotated at a predetermined constant speed until it stops, a stop period during which the endless belt is stopped, and a period during which the endless belt stops rotating. during at least one of the acceleration periods from the start until reaching a predetermined constant speed, suppressing the increase in the adhesive force due to the stopping operation of the endless belt ;
The adhesive force adjusting mechanism is configured to adjust a pressing force for pressing the removing member against the surface of the endless belt,
During the stop period, the removing member is kept in contact with the endless belt,
The recording medium conveying device, wherein the adhesive force adjusting mechanism lowers the pressure contact force during the stop period than the pressure contact force when the endless belt is rotating at the constant speed. an endless belt that has a surface coated with an adhesive and rotates while the recording medium is in close contact with the surface to convey the recording medium;
a cleaning liquid applying unit that applies cleaning liquid to the surface of the endless belt;
a removing member arranged downstream of the cleaning liquid application section in the rotation direction of the endless belt, contacting the surface of the endless belt, and removing the cleaning liquid adhering to the surface of the endless belt;
a driving unit for intermittently driving the endless belt;
an adhesive force adjustment mechanism that adjusts the adhesive force between the endless belt and the removing member by the adhesive,
The adhesive force adjustment mechanism comprises a deceleration period during which the endless belt rotates at a predetermined constant speed until it stops, a stop period during which the endless belt is stopped, and a period during which the endless belt stops rotating. during at least one of the acceleration periods from the start until reaching a predetermined constant speed, suppressing the increase in the adhesive force due to the stopping operation of the endless belt;
The adhesive force adjusting mechanism is configured to adjust a pressing force for pressing the removing member against the surface of the endless belt,
The adhesive force adjustment mechanism makes the contact pressure during the stop period lower than the contact pressure when the endless belt is rotating at the constant speed,
The recording medium conveying device, wherein the pressing force during the stop period is in the range of 30% or more and 80% or less of the pressing force when the endless belt is rotating at the constant speed. an endless belt that has a surface coated with an adhesive and rotates while the recording medium is in close contact with the surface to convey the recording medium;
a cleaning liquid applying unit that applies cleaning liquid to the surface of the endless belt;
a removing member arranged downstream of the cleaning liquid application section in the rotation direction of the endless belt, contacting the surface of the endless belt, and removing the cleaning liquid adhering to the surface of the endless belt;
a driving unit for intermittently driving the endless belt;
an adhesive force adjustment mechanism that adjusts the adhesive force between the endless belt and the removing member by the adhesive,
The adhesive force adjustment mechanism comprises a deceleration period during which the endless belt rotates at a predetermined constant speed until it stops, a stop period during which the endless belt is stopped, and a period during which the endless belt stops rotating. during at least one of the acceleration periods from the start until reaching a predetermined constant speed, suppressing the increase in the adhesive force due to the stopping operation of the endless belt;
The adhesive force adjusting mechanism is configured to adjust a pressing force for pressing the removing member against the surface of the endless belt,
The recording medium conveying device , wherein the adhesive force adjustment mechanism gradually reduces the pressure contact force during the deceleration period. The pressing force at the start of the acceleration period is the same value as the pressing force during the stopping period,
4. The recording medium conveying device according to claim 1 , wherein said adhesive force adjustment mechanism gradually increases said pressure contact force during said acceleration period. an endless belt that has a surface coated with an adhesive and rotates while the recording medium is in close contact with the surface to convey the recording medium;
a cleaning liquid applying unit that applies cleaning liquid to the surface of the endless belt;
a removing member arranged downstream of the cleaning liquid application section in the rotation direction of the endless belt, contacting the surface of the endless belt, and removing the cleaning liquid adhering to the surface of the endless belt;
a driving unit for intermittently driving the endless belt;
an adhesive force adjustment mechanism that adjusts the adhesive force between the endless belt and the removing member by the adhesive,
The adhesive force adjustment mechanism comprises a deceleration period during which the endless belt rotates at a predetermined constant speed until it stops, a stop period during which the endless belt is stopped, and a period during which the endless belt stops rotating. during at least one of the acceleration periods from the start until reaching a predetermined constant speed, suppressing the increase in the adhesive force due to the stopping operation of the endless belt;
The adhesive force adjusting mechanism is configured to adjust a pressing force for pressing the removing member against the surface of the endless belt,
The adhesive force adjusting mechanism moves the removing member to the surface of the endless belt before the endless belt starts accelerating after separating the removing member from the surface of the endless belt for a certain period in the stop period. A recording medium conveying device that makes contact with the endless belt and gradually increases the pressure contact force until the endless belt reaches a predetermined speed. A recording medium conveying device according to any one of claims 1 to 5 ;
and an image forming unit that forms an image on the recording medium in close contact with the surface of the endless belt. 7. The image forming apparatus according to claim 6 , wherein said image forming section includes a head section for ejecting ink toward said recording medium.

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