CN115195287A

CN115195287A - Conveying device

Info

Publication number: CN115195287A
Application number: CN202210378919.9A
Authority: CN
Inventors: 大江朋久
Original assignee: Riso Kagaku Corp
Current assignee: Riso Kagaku Corp
Priority date: 2021-04-13
Filing date: 2022-04-12
Publication date: 2022-10-18
Also published as: JP2022162690A

Abstract

The invention provides a conveying device, which can reduce the separation and scattering of garbage from a charge removing brush. The conveying belt (21) conveys the paper (P) while rotating. The static removing brush (6) removes electricity from the paper (P) conveyed by the conveying belt (21). When the transport unit (3) is moved from the jam release position to the transport position, the control unit (8) controls the transport belt (21) to abut against the electricity removal brush (6) while rotating in the same direction as when the paper (P) is transported.

Description

Conveying device

Technical Field

The present invention relates to a conveying device.

Background

There is known a printing apparatus that performs printing on paper by ejecting ink from an inkjet head while conveying the paper by being attracted to a charged conveyance belt.

In such a printing apparatus, it is known to provide a static elimination brush for removing static electricity from the printing surface of the paper in order to secure the suction force of the conveying unit (see patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2017-109811

Disclosure of Invention

Problems to be solved by the invention

In the printing apparatus as described above, when a paper jam (jam) occurs, the conveyance unit is lowered from a conveyance position, which is a position where the paper is conveyed, to a jam release position, which is a position where the jam release operation is performed. Here, in a state where the conveying section is disposed at the conveying position, the bristle tips of the static elimination brushes abut against the conveying belt. The static elimination brush is separated from the conveying belt in a state that the conveying part is arranged at the jam releasing position.

When the conveyance unit is lifted from the jam release position to the conveyance position after the jam is released and the static elimination brush comes into contact with the conveyance belt, the static elimination brush is pressed by the conveyance belt and the posture of the static elimination brush varies. When the paper is directly fed to the paper conveying operation and the conveying belt is rotated violently, the posture of the charge removing brush is changed sharply, and therefore, the dust such as paper dust accumulated in the charge removing brush is easily separated from the charge removing brush and scattered. When the dust separated and scattered from the static elimination brush adheres to the nozzle surface of the inkjet head, the print image quality is degraded.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a conveying device capable of reducing separation and scattering of dust from a static elimination brush.

Means for solving the problems

In order to achieve the above object, a conveying device according to the present invention includes: a carrying mechanism for carrying the object to be carried while rotating; a static electricity removing brush for removing static electricity from the conveyed object conveyed by the conveying mechanism; and a control unit that, when shifting from a state in which the conveyance mechanism is separated from the charge removal brush to a state in which the charge removal brush is in contact with the conveyance mechanism for performing charge removal of the conveyed object, controls the conveyance mechanism to rotate in the same direction as that for conveying the conveyed object while being in contact with the charge removal brush.

Effects of the invention

According to the conveying device of the present invention, separation and scattering of the dust from the electricity removal brush can be reduced.

Drawings

Fig. 1 is a schematic configuration diagram of a printing apparatus according to an embodiment.

Fig. 2 is a control block diagram of the printing apparatus shown in fig. 1.

Fig. 3 is a diagram showing a conveyance position and a jam clearing position of the conveyance unit of the printing apparatus shown in fig. 1.

Fig. 4 is a diagram showing a posture in which the hair tips of the wiping brush are aligned toward downstream.

Fig. 5 is a diagram showing a state in which the brush has a variation in the posture.

Fig. 6 is a diagram showing a state in which the dust is separated from the charge removing brush and scattered.

Description of the reference numerals

1: a printing device;

2: a paper feeding section;

3: a conveying part;

4: a lifting drive part;

5: pressing the roller;

6: a de-electrifying brush;

7: a printing section;

8: a control unit;

21: a carrying belt;

21a: carrying noodles;

22A, 22B: a support roller;

23: a tension roller;

24: a tension imparting spring;

25: a carrying motor;

26: a charging roller;

27: a live power supply;

28: a cleaning scraper.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or equivalent parts and components are denoted by the same or equivalent reference numerals.

The embodiments described below exemplify apparatuses and the like for embodying the technical idea of the present invention, and the technical idea of the present invention does not specify the material, shape, structure, arrangement, and the like of each constituent member as follows. The technical idea of the present invention can be variously modified within the scope of the technical solution.

Fig. 1 is a schematic configuration diagram of a printing apparatus provided with a conveying apparatus according to an embodiment of the present invention. Fig. 2 is a control block diagram of the printing apparatus shown in fig. 1. In the following description, a direction perpendicular to the paper surface of fig. 1 is referred to as a front-rear direction. The top, bottom, left, and right of the paper in fig. 1 are the top, bottom, left, and right directions. In fig. 1, the direction from left to right is a conveying direction of a sheet (corresponding to a conveyed object) P as a printing medium. The upstream and downstream in the following description refer to upstream and downstream in the conveying direction of the sheet P.

As shown in fig. 1 and 2, the printing apparatus 1 according to the present embodiment includes a paper feeding unit 2, a conveying unit 3, an elevation drive unit 4, a pressure roller 5, a charge removing brush 6, a printing unit 7, and a control unit 8.

The paper feed unit 2 feeds the paper P to the conveyance unit 3. The paper feeding unit 2 includes a paper feeding table 11, a paper feeding roller 12, and a registration roller 13.

The paper feeding table 11 loads paper P for printing.

The paper feed rollers 12 pick up and convey the paper P one by one from the paper feed table 11, and stop the paper P by abutting the registration rollers 13. The paper feed roller 12 is driven by a motor not shown.

The registration roller 13 temporarily stops the sheet P conveyed by the sheet feed roller 12 and conveys the sheet P toward the conveying unit 3. The registration roller 13 is driven by a motor not shown.

The conveying unit 3 conveys the sheet P conveyed by the registration rollers 13 by electrostatic attraction while holding the sheet P.

The conveyance unit 3 is movable between a conveyance position and a jam release position by the elevation drive unit 4. The conveyance position of the conveyance unit 3 is the position of the conveyance unit 3 when conveying the printed paper P. The conveyance position of the conveyance unit 3 is the position of the conveyance unit 3 shown in fig. 1 and the position of the conveyance unit 3 shown by the two-dot chain line in fig. 3, and is located in the vicinity of the lower side of the printing unit 7. The jam release position of the conveying portion 3 is a position of the conveying portion 3 when the user removes the paper P remaining in the printing apparatus 1 by the jam release operation. The jam release position of the conveying portion 3 is a position of the conveying portion 3 shown by a solid line in fig. 3, and is a position below the conveying position.

The conveying unit 3 includes a conveying belt (corresponding to a conveying mechanism) 21, a pair of

support rollers

22A and 22B, a tension roller 23, a tension applying spring 24, a conveying motor 25, a charging roller 26, a charging power supply 27, and a cleaning blade 28.

The conveyance belt 21 suctions and holds and conveys the sheet P. The conveyor belt 21 is an endless belt stretched between

support rollers

22A and 22B. The conveyance belt 21 holds the paper P by suction on the conveyance surface 21a by electrostatic attraction force generated by the electrification of the electrification roller 26. The conveying surface 21a is an upper surface of the conveying belt 21 extending between the

support rollers

22A and 22B, and is formed in a horizontal plane. During printing, the conveying belt 21 conveys the paper P sucked and held on the conveying surface 21a in the right direction while rotating (endlessly moving) in the clockwise direction in fig. 1.

The

support rollers

22A and 22B support the conveyor belt 21. The

support rollers

22A and 22B are disposed at the same height apart from each other in the left-right direction. The support roller 22A is driven to rotate by the conveyance motor 25, and rotates the conveyance belt 21. The support roller 22B rotates following the rotating conveyor belt 21. The support roller 22B may be driven to rotate by the conveying motor 25, and the support roller 22A may be driven to rotate by the conveying belt 21.

The tension roller 23 is a member that applies tension to the conveyor belt 21. By applying tension to the conveying belt 21 by the tension roller 23, a flat conveying surface 21a is formed between the

support rollers

22A and 22B. The tension roller 23 rotates following the rotating conveyor belt 21. The tension roller 23 is disposed between the

support rollers

22A and 22B at a position lower than the

support rollers

22A and 22B.

The tension applying spring 24 applies tension to the transport belt 21 via the tension roller 23 by pressing the tension roller 23.

The carrying motor 25 drives the support roller 22A to rotate. The carrying motor 25 may drive the supporting roller 22B to rotate.

The charging roller 26 charges the conveyor belt 21 by applying an electric charge to the conveyor belt 21. The charging roller 26 is disposed at a position contacting the conveyor belt 21, and rotates following the conveyor belt 21.

The charging power supply 27 applies a voltage for charging the transport belt 21 to the charging roller 26.

The cleaning blade 28 cleans the conveyor belt 21.

The lifting/lowering drive unit 4 lifts/lowers the conveyance unit 3 between the conveyance position and the jam release position. The elevation driving unit 4 includes a motor and the like.

The pressing roller 5 is a roller that presses the paper P against the conveying belt 21. The pressing roller 5 is disposed at the following positions: this position is a position where the conveying portion 3 contacts the conveying belt 21 above the support roller 22B when it is disposed at the conveying position. The pressing roller 5 rotates following the conveyance belt 21. Even if the conveying unit 3 is lowered from the conveying position, the pressing roller 5 is not lowered. Therefore, in a state where the conveying portion 3 is disposed at the jam clearing position, the pressing roller 5 is separated from the conveying belt 21.

The static electricity removal brush 6 removes electricity from the paper P conveyed by the conveyor belt 21. The static elimination brush 6 is disposed on the upstream side of the printing portion 7. When the conveying section 3 is disposed at the conveying position, the brush 6 is in a state in which the tip of the brush abuts against the conveyor belt 21. When the conveyance unit 3 is disposed at the jam release position, the neutralization brush 6 is separated from the conveyance belt.

The printing unit 7 ejects ink to the paper P conveyed by the conveying unit 3 to print an image. The printing unit 7 includes a plurality of inkjet heads 31.

The inkjet head 31 has a plurality of nozzles arranged in the front-rear direction, and ejects ink from the nozzles. The nozzles are opened on a nozzle surface 31a which is a lower surface of the inkjet head 31. The plurality of inkjet heads 31 are arranged in parallel along the conveyance direction (left-right direction) of the paper P.

The control unit 8 controls operations of the respective units of the printing apparatus 1. The control unit 8 includes a CPU, a RAM, a ROM, a hard disk, and the like.

When the transport unit 3 is moved from the jam release position to the transport position after the jam release, the control unit 8 controls the transport belt 21 to abut against the charge removing brush 6 while rotating (endlessly moving) in the same direction as that when the paper P is transported.

Next, the operation of the printing apparatus 1 will be described.

In printing, the paper feed roller 12 sequentially picks up the paper P from the paper feed table 11 and feeds the paper P to the registration roller 13. The sheet P picked up from the sheet feeding table 11 is temporarily stopped by abutting against the registration rollers 13, and then conveyed to the conveying unit 3 by the registration rollers 13. The paper P that has reached the conveying surface 21a of the conveying belt 21 of the conveying unit 3 is pressed against the conveying belt 21 by the pressing roller 5, and conveyed while being attracted to the conveying surface 21a by the electrostatic force in the conveying belt 21 charged by the charging roller 26.

At this time, the printing surface of the paper P is electrically removed by the removing brush 6 on the upstream side of the inkjet head 31. After the paper P passes through the neutralization brush 6, the paper P is printed with ink ejected from the inkjet head 31. Here, the conveying unit 3 is disposed at a conveying position, and conveys the sheet P at a predetermined printing conveying speed.

The printed paper P is conveyed by a conveying roller or the like, not shown, downstream of the conveying unit 3, and is sequentially discharged to a paper discharge table, not shown.

When a jam occurs in the paper P during the printing operation as described above, the control unit 8 stops the paper feeding unit 2 and the conveying unit 3. Next, the control unit 8 moves (lowers) the conveying unit 3 from the conveying position to the jam clearing position. After that, the user performs a jam clearing operation for removing the paper P remaining in the printing apparatus 1.

After the jam is released, the control unit 8 moves (raises) the conveying unit 3 from the jam release position to the conveying position while rotating the conveying belt 21. Thereby, the carrier belt 21 abuts against the charge removing brush 6 while rotating (endlessly moving). At this time, the control unit 8 controls the conveyance belt 21 to abut against the charge removing brush 6 while rotating in the same direction as that in the conveyance of the sheet P at a speed lower than that in the conveyance of the sheet P.

Accordingly, since the static elimination brush 6 is pressed by the conveying belt 21 while receiving a force in the downstream direction, when the conveying section 3 is disposed at the conveying position, the static elimination brush 6 takes a posture in which the hair tips are aligned in the downstream direction as shown in fig. 4.

After the conveyance unit 3 has completely moved from the jam clearing position to the conveyance position, the control unit 8 stops the rotation of the conveyance belt 21. Thereafter, when the printing operation is resumed, the control section 8 controls the transport belt 21 to rotate at the rotational speed at which the paper P is transported.

Here, unlike the present embodiment, when the conveying portion 3 is moved from the jam clearing position to the conveying position with the conveying belt 21 stopped, the position of the static elimination brush 6 varies as shown in fig. 5 as the static elimination brush 6 is pressed by the conveying belt 21 when coming into contact with the conveying belt 21.

In this state, when the rotation of the transport belt 21 is started to resume the printing operation, the posture of the charge removing brush 6 changes rapidly, and therefore, as shown in fig. 6, a phenomenon in which dust 41 such as paper dust accumulated in the charge removing brush 6 is separated from the charge removing brush 6 and is scattered easily occurs. When the dust 41 separated and scattered from the static elimination brush 6 adheres to the nozzle surface 31a of the inkjet head 31, the print image quality is degraded.

In contrast, in the present embodiment, as described above, when the conveying unit 3 is disposed at the conveying position, the neutralization brush 6 is oriented such that the hair tips are aligned downstream. Therefore, even if the rotation of the conveyor belt 21 is started to restart the printing operation, the attitude of the charge removing brush 6 does not change, and therefore separation and scattering of dust from the charge removing brush 6 can be reduced.

As described above, in the printing apparatus 1, when the transport unit 3 is moved from the jam clearing position to the transport position, the control unit 8 controls the transport belt 21 to abut against the neutralization brush 6 while rotating in the same direction as when the paper P is transported. Thus, when the conveying section 3 is disposed at the conveying position, the static elimination brush 6 takes a posture in which the hair tips are aligned downstream. Therefore, even if the rotation of the conveyor belt 21 is started to restart the printing operation, the attitude of the charge removing brush 6 does not change, and therefore, separation and scattering of dust from the charge removing brush 6 can be reduced.

In the above-described embodiment, the description has been made on the structure in which the transport belt 21 (transport unit 3) is raised and lowered with respect to the fixed neutralization brush 6, but the present invention is not limited thereto, and any structure may be employed as long as at least one of the neutralization brush 6 and the transport belt 21 is moved so that the neutralization brush 6 and the transport belt 21 can be brought into contact with and separated from each other. The conveying mechanism is not limited to the conveying belt 21 for conveying the paper P, and may be a mechanism for conveying the object to be conveyed while rotating. When the state is shifted from the state in which the conveyance mechanism is separated from the charge removal brush to the state in which the charge removal brush is brought into contact with the conveyance mechanism for charge removal of the object to be conveyed, the conveyance mechanism may be controlled to be brought into contact with the charge removal brush while rotating in the same direction as that in the conveyance of the object to be conveyed.

The present invention is not limited to the above-described embodiments, and can be embodied by modifying the constituent elements in the implementation stage within the scope not departing from the gist thereof. In addition, various inventions can be formed by appropriate combinations of a plurality of constituent elements disclosed in the above embodiments. For example, some of the components may be deleted from all the components shown in the embodiments.

[ accompanying notes ]

The present application discloses the following inventions.

(note 1) a conveying device, comprising: a carrying mechanism for carrying the object to be carried while rotating; a static electricity removing brush for removing static electricity from the conveyed object conveyed by the conveying mechanism; and a control unit that controls the conveying mechanism to rotate in the same direction as that in conveying the object and to come into contact with the static elimination brush when the state of the conveying mechanism separated from the static elimination brush is shifted to a state of the static elimination brush coming into contact with the conveying mechanism for static elimination of the object.

Claims

1. A carrying device is characterized in that,

the conveying device is provided with:

a carrying mechanism for carrying the object to be carried while rotating;

a static electricity removing brush for removing static electricity from the conveyed object conveyed by the conveying mechanism; and

and a control unit that, when the state of the conveyance mechanism being separated from the static elimination brush is shifted to a state of the conveyance mechanism being brought into contact with the static elimination brush for static elimination of the conveyed object, controls the conveyance mechanism to rotate in the same direction as that in the conveyance of the conveyed object and to come into contact with the static elimination brush.