JP2021014330A - Dust removal device - Google Patents

Abstract

To provide a dust removal device having excellent dust removal performance with an inexpensive and simple configuration.SOLUTION: A dust removal device of the present invention includes dust removal members (22, 54) that come into contact with a belt like conveyance medium (P) to be conveyed and remove dust (S) adhering to the conveyance medium, movable holding members (21, 53) that hold the dust removal members, receive a moving force in the conveyance direction conveyed from the conveyance medium to the dust removal members, perform a follow-up operation to the conveyance medium, and circulate and move a contact point of the dust removal member with the conveyance medium, and differential generating means (24, 30) that give resistance to the follow-up operation of the movable holding member and slow down the removal speed of the dust removal member with respect to the conveyance speed of the conveyance medium.SELECTED DRAWING: Figure 4

Description

The present invention relates to a dust removing device for removing dust such as paper dust adhering to a transport medium such as paper transported to a printing device.

Dust such as paper dust adheres to printing paper during the manufacturing process. If dust adheres to the paper when printing with the printing device, the printing quality may deteriorate or the printing device may have a problem (such as clogging of the nozzle of the inkjet head). As a countermeasure, a dust removing device for removing dust from the paper is provided. In particular, a dust removing device is often used in a printing device of a type in which long roll paper (continuous paper) is continuously conveyed and printed.

As a dust removing device, a brush is brought into contact with the paper transported by the transporting means to scrape off the dust, or dust is transferred by an electrostatic force to a dust removing roller that also serves as a roller for transporting paper. What makes you know is known. However, simply bringing the brush into contact with the paper may not sufficiently remove the dust, or the dust may scatter and reattach to the paper. Further, if the traveling speed of the paper and the peripheral speed of the peripheral surface of the dust removing roller are the same, dust cannot be sufficiently transferred from the surface of the paper to the dust removing roller.

In order to solve such a problem, in the paper dust removing device of Patent Document 1, the paper dust removing roller is driven by the paper dust removing roller drive mechanism using a motor, and the paper dust is driven with respect to the traveling speed of the paper. There is a speed difference in the peripheral speed of the removal roller. Further, the non-woven fabric impregnated with the cleaning liquid is conveyed so as to be in contact with the peripheral surface of the paper dust removing roller to remove the paper dust adhering to the paper dust removing roller.

JP-A-2010-52835

In the invention described in Patent Document 1, a drive mechanism using a motor is required to rotate the paper dust removing roller and convey the non-woven fabric, resulting in complicated structure, high cost, and increased power consumption. There was a problem such as.

An object of the present invention is to provide a dust removing device having an inexpensive and simple structure and excellent dust removing performance.

The dust removing device of the present invention holds a dust removing member that comes into contact with a strip-shaped transport medium to be transported and removes dust adhering to the transport medium, and holds the dust removing member to remove the dust from the transport medium. A movable holding member that receives a moving force in a transporting direction transmitted to the member to perform a follow-up operation to the transport medium and circulates and moves a contact portion of the dust removing member with the transport medium, and the follow-up operation of the movable holding member. It is characterized by comprising a differential generating means for giving resistance to the dust removing member and slowing the moving speed of the dust removing member with respect to the transport speed of the transport medium.

According to the present invention, it is possible to obtain a dust removing device having excellent dust removing performance with an inexpensive and simple configuration.

It is a perspective view which shows the paper transport part and the dust removal device. It is a perspective view which shows a part of the dust removal apparatus. It is a figure which shows the state which cleans the brush of the dust removal roller with a cleaning member. It is a side view which conceptually shows the removal of dust by a dust removal device. It is a perspective view which shows the 1st modification of the dust removal device. It is a side view which shows the 1st modification of the dust removing device, (A) shows the state which lowered the height of a cleaning member, (B) shows the state which raised the height of a cleaning member. It is a perspective view which shows the 2nd modification of the dust removal device. It is a side view which shows the 3rd modification of the dust removal device.

Hereinafter, the dust removing device according to the embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to the removal of dust adhering to the paper (continuous paper) conveyed to the printing apparatus.

The transport roller 11 and the transport roller 12 shown in FIG. 1 form a part of the paper transport unit 10. The paper transport unit 10 is provided in a printing device (not shown as a whole), and continuously transports continuous paper P, which is a strip-shaped transport medium, to the printing unit. FIG. 1 shows only a part of the transport path of the continuous paper P by the paper transport unit 10. The continuous paper P is supported by an unwinding portion (not shown) in a state of being wound in a roll shape, is unwound from the unwinding portion, and is conveyed by a paper conveying portion 10 including a conveying roller 11 and a conveying roller 12. Reach the printing department. The continuous paper P for which printing by the printing unit has been completed is collected by winding it in a roll shape at the winding unit (not shown) or cutting it with a cutting machine (not shown).

Of the front and back surfaces of the continuous paper P, the side facing upward on the substantially horizontal transport path from the transport roller 11 to the transport roller 12 is defined as the upper surface, and the side facing downward is defined as the lower surface. The transfer roller 11 and the transfer roller 12 can rotate around parallel rotation shafts 11a and 12a, and a driving force is transmitted from a drive mechanism (not shown) to perform a rotation operation to convey the continuous paper P.

The transport roller 11 brings the peripheral surface of the cylindrical paper contact portion 11b concentric with the rotating shaft 11a into contact with the lower surface of the continuous paper P. The transport roller 12 brings the peripheral surface of the cylindrical paper contact portion 12b concentric with the rotating shaft 12a into contact with the upper surface of the continuous paper P. When the transport roller 11 and the transport roller 12 are rotationally driven by the drive mechanism, a force for transporting the continuous paper P in the longitudinal direction is applied by the friction acting between the peripheral surfaces of the paper contact portions 11b and 12b and the continuous paper P. The arrow F shown in FIG. 1 and the like is the traveling direction of the continuous paper P when it is conveyed to the printing apparatus. In the following, the traveling direction will be referred to as the transport direction F. Although not shown in FIG. 1, a transport roller that is paired with the transport roller 11 to sandwich the continuous paper P or a transport roller that is paired with the transport roller 12 to sandwich the continuous paper P may be provided.

The continuous paper P runs substantially horizontally in the transport path from the transport roller 11 to the transport roller 12. In the printing device, a dust removing device 13 for removing dust adhering to the continuous paper P is provided below the transport path. The dust removing device 13 removes dust adhering to the lower surface side of the continuous paper P.

The paper transport unit 10 includes a transport path (not shown) in which the front and back sides of the continuous paper P are turned upside down from the states shown in FIGS. 1 and 4, and dust is removed below the transport path. A dust removing device having the same configuration as that of the device 13 is provided. As a result, dust can be removed from both the front and back surfaces of the continuous paper P.

The dust removing device 13 is arranged in front of the printing unit in the transport path of the continuous paper P. This prevents the printing unit from being affected by the dust adhering to the continuous paper P.

The dust removing device 13 of the present embodiment will be described with reference to FIGS. 1 to 4. The dust removing device 13 has a dust removing roller 20. The dust removing roller 20 has a cylindrical brush holding member 21 and a brush 22 arranged in a roller shape on the outer peripheral surface of the brush holding member 21.

The brush 22 is an example of a dust removing member that comes into contact with the conveyed continuous paper P and removes dust adhering to the continuous paper P. The dust removing member may be another member such as a pad, and is not limited to the brush 22. The brush holding member 21 holds the brush 22, which is a dust removing member, and receives a moving force from the continuous paper P to the brush 22 in the transport direction F to follow the continuous paper P (rotating portion). ) Is an example.

The brush holding member 21 has a rotating shaft 23 protruding from both ends in the longitudinal direction (axial direction). The rotating shaft 23 extends in parallel with the rotating shafts 11a and 12a of the conveying rollers 11 and 12. In other words, the rotating shaft 23 extends perpendicular to the transport direction F of the continuous paper P. The rotary shaft 23 is pivotally supported by a shaft support member (not shown) provided on the paper transport portion 10, and the brush holding member 21 is rotatably supported around the rotary shaft 23. The dust removing roller 20 is driven and rotated by a force for conveying the continuous paper P, and does not have a unique drive mechanism for rotating the brush holding member 21.

The brush 22 is configured as an aggregate of a plurality of linear members 22a (see FIG. 3). A plurality of linear members 22a are radially projected from the outer peripheral surface of the brush holding member 21, and the linear members 22a are continuously arranged in the rotation direction (circumferential direction of the dust removing roller 20) about the rotation shaft 23. In this way, the roller-shaped brush 22 is configured. In addition, in FIG. 1, FIG. 2 and FIG. 4, for convenience of drawing, a gap is drawn in the middle of the brush 22 in the circumferential direction of the dust removing roller 20, but in reality, a plurality of linear members are drawn. 22a are arranged at high density in the circumferential direction with almost no gap.

The brush 22 is provided substantially in the longitudinal direction (axial direction) of the brush holding member 21. From the viewpoint of removing dust adhering to the continuous paper P over the entire width direction of the continuous paper P, the length occupied by the brush 22 in the longitudinal direction of the brush holding member 21 is equal to or more than the width of the continuous paper P. It is desirable to be long.

The longitudinal direction of the brush 22 is a direction that intersects the transport direction F of the continuous paper P (a direction that is not parallel), and is preferably a direction that is perpendicular to the transport direction F of the continuous paper P (continuous paper). (Width direction of P). When the longitudinal direction of the brush 22 and the axial direction of the rotating shaft 23 are perpendicular to the conveying direction F of the continuous paper P, when the moving force in the conveying direction F is transmitted from the continuous paper P to the dust removing roller 20. No extra component force is generated.

Rotary dampers 24 are connected to both ends of the rotating shaft 23 (see FIG. 1). The rotary damper 24 is an example of a differential generating means that gives resistance to the follow-up operation of the brush holding member 21 to the continuous paper P to be conveyed and slows down the moving speed of the brush 22 with respect to the conveying speed of the continuous paper P. ..

As shown in FIG. 2, a gear 23a is provided at the axial end of the rotating shaft 23, and the gear 24a provided on the shaft of the rotary damper 24 meshes with the gear 23a. The housing 24b of the rotary damper 24 is fixed to a support member (not shown). The rotary damper 24 generates a braking force by the viscous resistance of oil inside the housing 24b, and gives a resistance of a predetermined magnitude to the rotation of the gear 24a. Therefore, in a state where the gear 24a is meshed with the gear 23a, resistance is given from the rotary damper 24 to the rotational operation of the brush holding member 21. FIG. 2 shows a rotary damper 24 provided at one end of the rotating shaft 23, but the rotary damper 24 on the other end side of the rotating shaft 23 has the same configuration.

As shown in FIG. 4, the dust removing roller 20 brings the brush 22 into contact with the lower surface of the continuous paper P running between the transport roller 11 and the transport roller 12 from below. More specifically, the dust removing roller 20 so as to slightly push up the continuous paper P traveling along the transport path extending horizontally from the transport roller 11 to the transport roller 12 (so as to overlap the transport path in the vertical direction). Is installed. As a result, the brush 22 comes into contact with the continuous paper P at a predetermined contact pressure.

When the continuous paper P is moved in the transport direction F by the paper transport unit 10, friction with the brush 22 in contact with the lower surface of the continuous paper P causes the continuous paper P to move in the transport direction F with respect to the brush 22. The movement power of is added. Then, the brush holding member 21 that receives the moving force from the brush 22 rotates in the forward direction R1 about the rotation shaft 23 (following operation of the continuous paper P). When the brush holding member 21 rotates in the forward direction R1, the contact points of the brush 22 with the continuous paper P sequentially change in the circumferential direction of the dust removing roller 20. That is, in accordance with the rotation of the brush holding member 21, the contact portion of the brush 22 with respect to the continuous paper P is circulated and moved, and the outer peripheral portion of the brush 22 separated after contacting the continuous paper P goes around the rotation axis 23. After turning, it comes into contact with the continuous paper P again.

When the dust removing roller 20 rotates in the forward direction R1 under the moving force of the continuous paper P to be conveyed, the brush holding member 21 rotates in the direction opposite to the forward direction R1 due to the resistance from the rotary damper 24. It receives a load in a certain reverse direction R2. As a result, the moving speed (peripheral speed) of the dust removing roller 20 in the forward direction R1 becomes relatively slower than the transport speed of the continuous paper P in the transport direction F. Due to the differential caused by the speed difference between the continuous paper P and the dust removing roller 20, the tip of the brush 22 is in a state of rubbing the lower surface of the continuous paper P, and the dust S such as paper dust adhering to the lower surface of the continuous paper P. Can be reliably scraped off by the brush 22. Since the brush 22 is formed by arranging the linear members 22a at a high density continuously in the circumferential direction of the dust removing roller 20, the moving force of the continuous paper P is surely applied to the dust removing roller 20 via the brush 22. While transmitting, dust S can be removed evenly from the continuous paper P.

The dust S scraped from the continuous paper P by the brush 22 is transferred to the brush 22 (mainly near the tip). Further, a part of the scraped dust S does not transfer to the brush 22 but falls downward by gravity. The dust removing device 13 includes a dust box 25 and a cleaning member 26 below the dust removing roller 20 in order to collect the dust S removed from the continuous paper P.

The dust box 25 is a box-shaped body composed of a rectangular bottom wall 25a and a side wall 25b protruding upward from the peripheral edge of the bottom wall 25a, and is installed in the paper transport unit 10 in a state of being opened upward. ing. The dust box 25 has a size (area) that covers the entire area below the area where the brush 22 is arranged by the dust removing roller 20, and the dust S that has been removed from the continuous paper P by the brush 22 and has fallen is , It is surely collected by the dust box 25.

The cleaning member 26 is provided on the dust box 25 and extends along the longitudinal direction of the dust removing roller 20. In order to clean the entire brush 22 in the longitudinal direction, it is desirable that the length of the cleaning member 26 in the longitudinal direction of the dust removing roller 20 is equal to or greater than the length of the brush 22.

The cleaning member 26 has a base portion 26a mounted on the bottom wall 25a of the dust box 25, and a comb tooth portion 26b protruding upward from the base portion 26a. A plurality of slits 26c having a width through which the linear member 22a of the brush 22 can pass are intermittently formed in the comb tooth portion 26b along the longitudinal direction of the cleaning member 26 (see FIGS. 2 and 3). ..

As shown in FIG. 4, a part of the lower end side of the brush 22 and the comb tooth portion 26b of the cleaning member 26 overlap in the vertical direction. Therefore, when the dust removing roller 20 rotates about the rotation shaft 23, the tip end side of the brush 22 intersects the comb tooth portion 26b when passing through the installation position of the cleaning member 26. At that time, as shown in FIG. 3, the brush 22 rubs against the comb tooth portion 26b (the portion between the plurality of slits 26c), and the dust S adhering to the brush 22 is scraped off. The dust S scraped off by the cleaning member 26 falls downward due to gravity and is collected by the dust box 25.

In this way, the brush 22 of the dust removing roller 20 that follows and rotates with the transportation of the continuous paper P passes while intersecting the comb tooth portion 26b of the cleaning member 26, thereby cleaning the brush 22 (from the continuous paper P). Dust S transferred to the brush 22) is removed. The cleaning member 26 removes dust S from the brush 22 during the circulation movement until the linear member 22a of the brush 22 in contact with the continuous paper P next contacts the continuous paper P. Therefore, it is possible to prevent the brush 22 from coming into contact with the continuous paper P again with the dust S attached and reattaching the dust S to the continuous paper P.

The cleaning member 26 is fixedly supported, and the brush 22 is cleaned by using the rubbing of the brush 22 and the comb tooth portion 26b by the rotational operation of the dust removing roller 20, so that no original driving means is required. .. Therefore, the brush 22 can be cleaned with an inexpensive and simple configuration. The dust box 25 is detachably attached to the paper transport section 10, and when the amount of collected dust S increases, the dust box 25 is removed and the dust S is discarded.

As described above, in the dust removing device 13 of the present embodiment, when the dust removing roller 20 receives the moving force of the continuous paper P to be conveyed and the dust removing roller 20 follows (rotates), a load is applied by the rotary damper 24. By causing a speed difference between the transport speed of the continuous paper P and the moving speed of the dust removing roller 20, the dust S is efficiently removed by the brush 22. A rotary damper against the force in the forward direction R1 received by the dust removing roller 20 when the continuous paper P is conveyed without using a drive source such as a motor for driving the dust removing roller 20 or a complicated driving mechanism. Since the load is only passively applied by 24, it is possible to realize reliable dust removal from the continuous paper P with an inexpensive and simple configuration.

Further, a cleaning member 26 is provided at a position intersecting the brush 22 of the dust removing roller 20, and the brush 22 can be cleaned at the same time as dust is removed from the continuous paper P by the dust removing roller 20. Since the cleaning member 26 is fixed and the dust S is removed from the brush 22 by the rotating force of the dust removing roller 20, an inexpensive and simple configuration is required without the need for a unique driving means.

Subsequently, a modified example of the dust removing device 13 will be described with reference to FIGS. 5 to 8. 5 and 6 show a first modification, FIG. 7 shows a second modification, and FIG. 8 shows a third modification. In the following modification, the members and parts common to the above-described configuration are indicated by the same reference numerals and the description thereof will be omitted.

In the first modification of the dust removing device 13 shown in FIGS. 5 and 6, the height of the cleaning member 30 can be adjusted in the vertical direction with respect to the support member 31. The support member 31 extends along the longitudinal direction of the dust removing roller 20. The base portion 31a of the support member 31 is placed on the bottom wall 25a of the dust box 25, and the mounting plate portion 31b projects upward from the base portion 31a.

The cleaning member 30 has a plate shape extending in the longitudinal direction of the dust removing roller 20, and has a comb tooth portion 30a formed with a plurality of slits 30b through which the linear member 22a (see FIG. 3) of the brush 22 can pass. There is a portion where the slit 30b does not exist near both ends of the cleaning member 30 in the longitudinal direction, and an elongated hole 30c oriented in the longitudinal direction is formed in the portion. A bolt insertion hole 31c (see FIG. 6) is formed in the mounting plate portion 31b of the support member 31 at a position communicating with the elongated hole 30c. Although FIGS. 5 and 6 show only the height adjusting structure on one end side of the cleaning member 30, a similar height adjusting structure is provided on the other end side of the cleaning member 30.

When assembling the cleaning member 30, the cleaning member 30 is superposed on the mounting plate portion 31b of the support member 31, and the bolt 32 is inserted into the elongated hole 30c and the bolt insertion hole 31c. The bolt 32 is screwed into the nut 33 arranged on the back side of the mounting plate portion 31b (the side opposite to the side where the cleaning member 30 is attached), and when the bolt 32 is tightened, the cleaning member 30 is fastened and fixed to the support member 31. To.

The cleaning member 30 can be moved up and down by changing the insertion position of the bolt 32 in the longitudinal direction of the elongated hole 30c, and by changing the position of the cleaning member 30 up and down, the comb tooth portion 30a with respect to the brush 22 The amount of intersection (the amount of overlap in the vertical direction) is changed. FIG. 6A shows a state in which the cleaning member 30 is positioned at the lowermost position within a range that can be adjusted by the elongated hole 30c, and the amount of intersection M between the brush 22 and the cleaning member 30 is minimized. FIG. 6B shows a state in which the cleaning member 30 is positioned at the uppermost position within a range that can be adjusted by the elongated hole 30c, and the crossing amount M between the brush 22 and the cleaning member 30 is maximized.

When the brush 22 passes through the comb tooth portion 30a of the cleaning member 30, the brush 22 comes into contact with the wall surface around the slit 30b of the comb tooth portion 30a and is deformed, or is bent so as to get over the upper surface of the cleaning member 30. And receive resistance. Therefore, if the amount of intersection between the brush 22 and the cleaning member 30 is increased, the movement resistance of the cleaning member 30 to the dust removing roller 20 increases, and the moving speed of the dust removing roller 20 rotating in the forward direction R1 becomes slow. On the contrary, when the amount of intersection between the brush 22 and the cleaning member 30 is reduced, the movement resistance of the cleaning member 30 to the dust removing roller 20 is reduced, and the moving speed of the dust removing roller 20 rotating in the forward direction R1 is increased. When the speed of the dust removing roller 20 decreases, the time for each linear member 22a (FIG. 3) constituting the brush 22 to rub the lower surface of the continuous paper P becomes longer, and the dust removing effect becomes higher.

In this way, the magnitude of the load on the dust removing roller 20 is adjusted by utilizing the change in the crossing amount M between the cleaning member 30 and the brush 22, and the speed of the dust removing roller 20 having excellent dust removing efficiency is set. Can be done. Since this load adjustment only needs to change the mounting position of the cleaning member 30 with respect to the support member 31, it can be realized with an inexpensive and simple configuration. For example, if the rotary damper 24 is to be replaced to adjust the load, it is necessary to prepare a plurality of types of rotary dampers 24 having different viscous resistances, which is more costly and laborious than the height adjustment of the cleaning member 30. ..

It is also possible to reduce the moving speed of the dust removing roller 20 by mainly utilizing the moving resistance given to the brush 22 by the cleaning member 30, and to configure the dust removing device without using the rotary damper 24. That is, a configuration in which only the cleaning member 30 is applied as the differential generation means can be selected.

In the second modification of the dust removing device 13 shown in FIG. 7, the dust removing roller 20 is movable in the vertical direction, and a force is applied to move the dust removing roller 20 toward the continuous paper P side. At both ends of the rotating shaft 23, urging support mechanisms 40 that movably support the dust removing roller 20 are provided. Although FIG. 7 shows only the urging support mechanism 40 on one end side of the dust removing roller 20, the other end side of the dust removing roller 20 also has a similar urging support mechanism 40.

The urging support mechanism 40 includes a bearing portion 41. The rotating shaft 23 of the brush holding member 21 is inserted and fixed to the bearing portion 41, and the rotary damper 24 is assembled. The bearing portion 41 is supported so as to be movable in the vertical direction via a guide means (not shown) provided in the paper transport portion 10. An urging member 42 is attached to the lower portion of the bearing portion 41. The urging member 42 is a coil-shaped compression spring, the upper end of which abuts on the bearing portion 41, and the lower end of which abuts on the bottom wall 25a of the dust box 25 to urge the bearing portion 41 upward. Therefore, a force U that moves the dust removing roller 20 that is supported at both ends of the rotating shaft 23 by the urging support mechanism 40 toward the continuous paper P side above is applied by the urging force of the urging member 42.

A tension is always applied to the continuous paper P conveyed by the paper conveying unit 10, and the continuous paper P is pressed against the brush 22 by this tension. However, when the continuous paper P is a thin paper having a weak stiffness, the continuous paper P is conveyed with a lower tension than general paper in order to prevent wrinkles from forming. Then, the force for pressing the continuous paper P against the brush 22 is reduced, and the friction between the continuous paper P and the brush 22 is reduced, so that the force for the brush 22 to scrape off the dust is reduced.

By constantly applying a force U for moving the dust removing roller 20 to the continuous paper P side by the urging support mechanism 40, the contact pressure of the brush 22 with respect to the continuous paper P is secured even when the tension of the continuous paper P is small. Therefore, efficient dust removal can be realized.

By preparing a plurality of types of urging members 42 having different magnitudes of urging force and exchanging the urging members 42, it is possible to appropriately adjust the degree of the force U to be moved to the continuous paper P side. .. The urging member 42, which is a compression spring, has a low component cost and can be easily replaced.

The urging member 42 shown in the drawing is an example of an urging means for applying a force U for moving the dust removing roller 20 to the continuous paper P side, and the urging means is a compression spring such as the urging member 42. Not limited. For example, as the urging means, a tension spring that pulls the bearing portion 41 from above may be used. Alternatively, the bearing portion 41 may be supported from below by an elastic body other than the spring, and the dust removing roller 20 may be pressed against the continuous paper P side by the restoring force of the elastic body to form the urging means.

The dust removing roller 20 described above includes a cylindrical brush holding member 21 as a movable holding member (rotating portion), and the dust removing member is composed of brushes 22 radially arranged on the outer peripheral surface of the brush holding member 21. However, the movable holding member and the dust removing member in the present invention are not limited to this. As an example thereof, FIG. 8 shows a third modification of the dust removing device 13. In this modification, a dust removing unit 50 having a form different from that of the dust removing roller 20 is used.

The dust removing unit 50 has a plurality of (three in the example of FIG. 8) roller members 51 arranged along the transport direction F of the continuous paper P. The configuration of each roller member 51 is the same as that of the brush holding member 21 described above, has a rotating shaft 52 extending in the width direction of the continuous paper P, and rotates about the rotating shaft 52 by a shaft support mechanism (not shown). It is supported as much as possible.

Although not shown, a rotary damper is connected to the end of the rotating shaft 52. Similar to the rotary damper 24 described above, this rotary damper is a differential generating means that applies a load to the rotation of the roller member 51 by viscous resistance.

A brush holding belt 53 having an oval loop structure is attached to the outside of the three roller members 51. The brush holding belt 53 swivels along the outer peripheral surface of each roller member 51 in an oval locus. The brush holding belt 53 is frictionally engaged with the outer peripheral surface of each roller member 51, and the rotation of each roller member 51 and the elliptical turning operation of the brush holding belt 53 are performed in synchronization with each other. In addition to frictional engagement, the moving force may be transmitted between the brush holding belt 53 and each roller member 51 by fitting a sprocket or the like. The brush holding belt 53 and the roller member 51 form a movable holding member, and the roller member 51 constitutes a rotating portion of the movable holding member.

A brush 54 is provided on the outer surface of the brush holding belt 53. Similar to the brush 22 described above, the brush 54 is configured as an aggregate of a plurality of linear members protruding outward from the brush holding belt 53. Corresponding to the shape of the brush holding belt 53, the outer peripheral shape of the brush 54 is oval. The brush 54 comes into contact with the lower surface of the continuous paper P from below. In the dust removing roller 20 described above, the brush 22 comes into contact with the continuous paper P in a linear region facing the longitudinal direction (the width direction of the continuous paper P), but in the dust removing unit 50, it spreads in the conveying direction of the continuous paper P. The brush 54 comes into contact with the continuous paper P in a planar area with a surface. As the dust removing member, another member such as a pad can be used instead of the brush 54.

A dust box 55 and a cleaning member 56 are provided below the dust removing unit 50. The dust box 55 and the cleaning member 56 have the same configuration as the dust box 25 and the cleaning member 26 described above. A plurality (three) cleaning members 56 are arranged on the circulation path of the brush 54 corresponding to the brush 54 having an oval outer peripheral shape.

When the continuous paper P is moved in the transport direction F, the brush 54 in contact with the lower surface of the continuous paper P receives a moving force in the transport direction F due to frictional force. Then, the brush holding belt 53 swivels in the forward direction R1, and the contact points of the brush 54 with respect to the continuous paper P are sequentially changed (circulated) along the loop shape of the brush holding belt 53.

Each roller member 51 rotates in the forward direction R1 as the brush holding belt 53 rotates. At this time, each roller member 51 receives a load in the reverse direction R2, which is a rotation direction opposite to the forward direction R1, due to the resistance from the rotary damper (not shown). As a result, the moving speed (peripheral speed) of the brush holding belt 53 in the forward direction R1 becomes relatively slower than the conveying speed of the continuous paper P in the conveying direction F. When the roller member 51 and the brush holding belt 53 are frictionally engaged with each other, the friction between the brush 54 and the continuous paper P is prevented so as not to cause slippage between the roller member 51 and the brush holding belt 53 at this time. The frictional force between the roller member 51 and the brush holding belt 53 is set to be larger than the force.

Due to the speed difference between the continuous paper P and the brush holding belt 53, the tip of the brush 54 is in a state of rubbing the lower surface of the continuous paper P, and the dust adhering to the lower surface of the continuous paper P is surely scraped off by the brush 54. Can be done. Since the contact area of the brush 54 with respect to the continuous paper P is wide, the dust removing effect can be enhanced.

The dust transferred from the continuous paper P to the brush 54 is scraped off by the cleaning member 56 and collected in the dust box 55.

As can be seen from the above, the movable holding member in the present invention does not have a mode of rotating around a specific axis like the brush holding member 21 and a specific rotation center like the brush holding belt 53. It includes any aspect of performing a turning operation. The follow-up operation of the movable holding member in the present invention is a concept including the rotation operation and the rotation operation.

In the above-described embodiment and each modification, the rotary damper is applied as the differential generating means for giving resistance to the brush holding member 21 and the roller member 51. The rotary damper is excellent in that it can always provide stable resistance to the brush holding member 21 and the roller member 51. However, it is also possible to use a differential generating means other than the rotary damper. For example, a braking member that frictionally contacts the rotating shafts 23 and 52, a spring member that generates an urging force in the rotating direction of the rotating shafts 23 and 52, and the like can be adopted as the differential generating means.

Further, in the configuration of FIG. 8, instead of giving resistance to each roller member 51 by a rotary damper or the like, it is also possible to select a configuration in which movement resistance is directly given to the brush holding belt 53 as the differential generating means. It is possible. For example, a friction member that constantly contacts the inner surface of the brush holding belt 53 to give movement resistance may be provided.

Further, the transport medium targeted for dust removal in the present invention may be a film or the like in addition to the printing paper.

In the above embodiment, the dust removing device 13 provided in the paper transport section 10 in the printing device is applied, but the dust removing device of the present invention can be used in addition to the printing device. For example, in an apparatus for applying a treatment agent or coating to a transport medium such as a strip of paper or a film, it may be applied to remove dust from the transport medium before these treatments.

Although the present invention has been described above with reference to embodiments and modifications based on the accompanying drawings, the present invention is not limited to the above-described embodiments and modifications, and various modifications and applications are made without departing from the gist. It is possible. In the above-described embodiment, the configuration and control shown in the accompanying drawings are not limited to this, and can be appropriately changed within the range in which the effects of the present invention are exhibited. In addition, it can be appropriately modified and implemented as long as it does not deviate from the gist of the present invention. The inventions described in the claims at the time of filing the application of the present application are described below.
[Appendix 1]
A dust removing member that comes into contact with the strip-shaped transport medium to be transported and removes dust adhering to the transport medium.
The dust removing member is held, and the moving force transmitted from the transport medium to the dust removing member in the transport direction is received to perform a follow-up operation to the transport medium, and the contact points of the dust removing member with the transport medium are circulated. Movable holding member to move and
A differential generating means that gives resistance to the following operation of the movable holding member and slows down the moving speed of the dust removing member with respect to the transport speed of the transport medium.
A dust removing device characterized by being provided with.
[Appendix 2]
Dust transferred from the transport medium to the dust removing member is provided below the transport medium at a position intersecting the circulation movement path of the dust removing member, and during the following operation of the movable holding member. The dust removing device according to Appendix 1, further comprising a cleaning member for cleaning.
[Appendix 3]
The cleaning member can adjust the amount of intersection with the dust removing member, and the magnitude of resistance of the movable holding member to the following operation is changed by changing the amount of intersection between the cleaning member and the dust removing member. The dust removing device according to Appendix 2, which is a feature.
[Appendix 4]
The dust removing device according to any one of Supplementary note 1 to 3, further comprising an urging means for applying a force to the movable holding member in a direction in which the dust removing member contacts the transport medium.
[Appendix 5]
The movable holding member has a rotating portion that can rotate about a rotation axis extending in a direction intersecting the transport direction of the transport medium.
The dust removing device according to any one of Appendix 1 to 4, wherein the differential generating means is a rotary damper that imparts rotational resistance to the rotating shaft.

10: Paper transfer unit 11: Transfer roller 12: Transfer roller 13: Dust removal device 20: Dust removal roller 21: Brush holding member (movable holding member, rotating part)
22: Brush (dust removal member)
23: Rotating shaft 24: Rotary damper (differential generating means)
25: Dust box 26: Cleaning member 30: Cleaning member (differential generating means)
30c: Long hole 31: Support member 40: Biasing support mechanism (urging means)
41: Bearing (biasing means)
42: Biasing member (urging means)
50: Dust removal unit 51: Roller member (movable holding member, rotating part)
52: Rotating shaft 53: Brush holding belt (movable holding member)
54: Brush (dust removal member)
55: Dust box 56: Cleaning member P: Continuous paper (conveying medium)
S: Dust

Claims (5)

A dust removing member that comes into contact with the strip-shaped transport medium to be transported and removes dust adhering to the transport medium.
The dust removing member is held, and the moving force transmitted from the transport medium to the dust removing member in the transport direction is received to perform a follow-up operation to the transport medium, and the contact points of the dust removing member with the transport medium are circulated. Movable holding member to move and
A differential generating means that gives resistance to the following operation of the movable holding member and slows down the moving speed of the dust removing member with respect to the transport speed of the transport medium.
A dust removing device characterized by being provided with. Dust that is provided below the transport medium and intersects the path of the circulation movement of the dust removing member, and that has been transferred from the transport medium to the dust removing member during the following operation of the movable holding member. The dust removing device according to claim 1, further comprising a cleaning member for cleaning. The cleaning member can adjust the amount of intersection with the dust removing member, and the magnitude of resistance of the movable holding member to the following operation is changed by changing the amount of intersection between the cleaning member and the dust removing member. The dust removing device according to claim 2. The dust removal according to any one of claims 1 to 3, wherein the movable holding member is provided with an urging means for applying a force in a direction in which the dust removing member comes into contact with the transport medium. apparatus. The movable holding member has a rotating portion that can rotate about a rotation axis extending in a direction intersecting the transport direction of the transport medium.
The dust removing device according to any one of claims 1 to 4, wherein the differential generating means is a rotary damper that imparts rotational resistance to the rotating shaft.

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