JP2019155575A - Cutting-off device and image formation device - Google Patents

Abstract

To provide a cutting-off device that can acquire stable cutting-off performance even when a conveyance amount and a conveyance direction of a recording medium vary, and to provide an image formation device using the same.SOLUTION: A cutting-off device 28 includes: a cutting-off member 27 having a blade part 27a for cutting-off a recording medium 22; drive means 33 for driving the cutting-off member 27; and position adjusting means 29 for adjusting a relative position of the cutting-off member 27 to the recording medium 22 so that the blade part 27a takes a proper cutting-off position relative to the recording medium 22 depending on variation in a conveyance direction of the recording medium 22.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a cutting apparatus and an image forming apparatus.

An image forming apparatus that forms an image on a long recording medium such as roll paper is known. In one of such image forming apparatuses, the recording medium is sent out toward the image forming unit, and after the image is formed in the image forming unit, the recording medium on which the image is formed is further conveyed downstream, There is known a technique of cutting a recording medium by a cutting device including a cutting member that can move in a main scanning direction that is the width direction of the recording medium.
However, in the conventional cutting apparatuses, since the transport amount of the recording medium changes depending on the roll diameter and winding direction of the recording medium, it is difficult to perform a stable cutting operation by changing the posture of the recording medium with respect to the cutting member. There was a problem.

In addition, when cutting strip steel sheets, in order to ensure that the wear of the cutting tool is uniform regardless of the plate thickness of the steel sheet, there is a technology that always maintains the cutting tool in an appropriate posture against fluctuations in the plate thickness. However, this technique has a problem that the cutting surface is frequently inclined and proper processing cannot be performed.
Therefore, a technique is disclosed in which the support roller placed on the upper surface of the steel plate is moved up and down together with the cutter frame to maintain the relative position between the steel plate and the cutting tool (see, for example, “Patent Document 1”).

When cutting a long recording medium, it may be possible to maintain the relative position between the recording medium and the cutting member by applying the technique described in “Patent Document 1”. In the technique disclosed in the above, there is no description about the case where the conveyance direction of the recording medium changes, and when the conveyance direction of the recording medium changes, the posture of the recording medium with respect to the cutting member changes and becomes stable. There is a problem that cutting performance cannot be obtained.
The present invention solves the above-described problems, and provides a cutting apparatus capable of obtaining stable cutting performance even when the transport amount and transport direction of a recording medium change, and an image forming apparatus using the same With the goal.

  According to the first aspect of the present invention, the cutting member having a blade part that cuts the recording medium, a driving unit that drives the cutting member, and the blade part is changed according to a change in a conveyance direction of the recording medium. And a position adjusting means for adjusting a relative position of the cutting member with respect to the recording medium so as to take an appropriate cutting position with respect to the recording medium.

  According to the present invention, even when the transport amount and transport direction of the recording medium are changed, each blade portion can be brought into contact with the recording medium at an appropriate position. A cutting device having cutting performance can be provided.

1 is a schematic perspective view of an image forming apparatus to which an embodiment of the present invention can be applied. 1 is a schematic front view of an image forming apparatus to which an embodiment of the present invention can be applied. It is the schematic explaining the conventional cutting device. It is the schematic explaining the problem of the conventional cutting device. It is the schematic explaining the problem of the conventional cutting device. It is the schematic of the cutting device used for one Embodiment of this invention. It is the schematic explaining the structure when the sheet conveyance direction of the cutting device used for one Embodiment of this invention changes. It is the schematic explaining the structure when the sheet conveyance direction of the cutting device used for one Embodiment of this invention changes.

FIG. 1 is a schematic view of an ink jet recording apparatus which is a conventional image forming apparatus to which the cutting apparatus of the present invention is applicable, and FIG. 2 is a front view thereof.
In FIG. 1, an ink jet recording apparatus 1 is a serial type image forming apparatus, and includes an apparatus main body 2, and a paper feeding device 3 and a winding device 4 disposed below the apparatus main body 2. In the present embodiment, the paper feeding device 3 and the winding device 4 are provided integrally with the device main body 2, but each may be provided separately or any one of them may be provided separately. An image forming unit 5 for forming an image is disposed inside the apparatus main body 2.

  The image forming unit 5 includes a guide rod 6 and a guide stay 7 that are spanned on both side plates (not shown), and a carriage 8 is supported by these so as to be movable in the main scanning direction indicated by an arrow A in the figure. . On one side of the image forming unit 5 in the main scanning direction, a main scanning motor 9 which is a driving source for reciprocating the carriage 8 is disposed, and a driving pulley 10 is connected to an output shaft thereof. A driven pulley 11 is disposed at a position facing the driving pulley 10, and a timing belt 12 is stretched between the pulleys 10 and 11. A belt holding unit (not shown) of the carriage 8 is connected to the timing belt 12, and the carriage 8 is reciprocated in the main scanning direction by the driving of the main scanning motor 9 with this configuration.

  The carriage 8 is mounted with a plurality of recording heads (not shown) that are integrated with an ink discharge head (not shown) and an ink tank that supplies ink to the ink discharge head. Each recording head is mounted such that a nozzle row having a plurality of nozzles for ejecting ink is arranged in the sub-scanning direction indicated by arrow B in the drawing orthogonal to the main scanning direction, and the ink ejection direction is downward. Yes. Each recording head is supplied with ink of a different color.

An encoder sheet 13 is disposed in the vicinity of the timing belt 12 along the moving direction of the carriage 8, and an encoder sensor (not shown) that reads the encoder sheet 13 is provided on the carriage 8. The encoder sheet 13 and an encoder sensor (not shown) constitute a linear encoder, and the speed and position of the carriage 8 are detected from the output of the linear encoder.
In the recording area of the main scanning area of the carriage 8, the recording medium is fed from the paper feeding device 3, and the conveyed recording medium is intermittently conveyed by the conveying means 14 in the sub-scanning direction.

  The ink tank of the recording head (not shown) mounted on the carriage 8 is supplied with ink of each color from an ink cartridge 15 that is replaceably mounted on the apparatus main body 2 via a supply tube. A conveyance guide member 16 for guiding a recording medium to be conveyed is disposed at a position corresponding to the lower side of the carriage 8, and a maintenance recovery mechanism that performs maintenance recovery of the recording head on one side of the carriage 8 in the main scanning direction. 17 is disposed.

  The transport unit 14 includes a transport roller 18 that transports a recording medium fed from the paper feeding device 2, and a pressure roller 19 that is disposed to face the transport roller 18. The conveyance guide member 16 is disposed on the downstream side of the conveyance unit 14 in the conveyance direction of the recording medium. The transport guide member 16 has a plurality of holes formed in the guide surface through which the recording medium passes, and the recording medium is sucked against the guide surface by the suction force of the suction fan 20 disposed below the hole. To do.

The paper feeding device 3 has a hollow shaft portion 21 such as a paper tube as a core member at the center thereof, and a long sheet 22 as a recording medium is wound around the hollow shaft portion 21 in a roll shape. Has been. The sheet 22 may or may not be fixed at the rear end of the sheet 22 with respect to the hollow shaft portion 21. In the case of fixing, the sheet 22 is fixed by glue, adhesive, tape, or the like.
The winding device 4 also has a hollow shaft portion 23 at the center thereof, and the front end of the sheet 22 is fixed to the hollow shaft portion 23. The sheet 22 is wound up by the hollow shaft portion 23 being rotated by a drive motor (not shown).
The apparatus main body 2 is provided with guide members 24 and 25 for guiding the sheet 22 supplied from the sheet feeding device 3 and the sheet 22 taken up by the take-up device 4. A cutting device 26 for cutting the sheet 22 is disposed on the downstream side in the direction.

  In such an ink jet recording apparatus 1, when the image is formed, the carriage 8 is moved in the main scanning direction, and the sheet 22 stored in the sheet feeding device 3 is intermittently sent to the image forming unit 5 by the conveying unit 14. A desired image is formed on the sheet 22 by driving the recording heads according to the image information and ejecting ink of each color from each nozzle. The sheet 22 on which the image is formed is guided by the guide member 25 and wound around the hollow shaft portion 23 of the winding device 4. Then, the cutting device 26 operates at a desired position, and the sheet 22 is cut.

Next, the configuration and problems of the above-described conventional cutting device 26 will be described.
As shown in FIG. 3, the cutting device 26 has a pair of rotary blades 27 which are cutting members. Each rotary blade 27 has a disk shape, and a blade portion 27a is formed on the entire circumference thereof. Although the rotary blades 27 are illustrated as being spaced apart from each other in FIG. 3, the rotary blades 27a are actually configured to wrap a predetermined amount from each other. Each rotary blade 27 is configured to be reciprocally movable in the paper surface direction in FIG. 3 by a motor (not shown) as a driving means, and is configured to rotate with the reciprocal movement.

FIG. 3 shows a default state (a state in which the winding device 4 has wound a predetermined amount of the sheet 22). In this case, each rotary blade 27 has its respective blade portion 27a substantially perpendicular to the sheet 22. Therefore, the sheet 22 can be satisfactorily cut when the cutting device 26 is operated.
However, as shown in FIG. 4, when the winding amount of the sheet 22 in the winding device 4 is small, or when the winding direction of the sheet 22 in the winding device 4 is reverse as shown in FIG. When the conveyance direction of 22 changes, each blade part 27a cannot be made to contact perpendicularly | vertically with respect to the sheet | seat 22, and there existed a problem that favorable cutting | disconnection could not be performed.

The configuration of the present invention that solves the above-described problems will be described below.
FIG. 6 shows a cutting apparatus to which an embodiment of the present invention is applied. In the figure, the cutting device 28 has a pair of rotary blades 27 which are cutting members similar to the cutting device 26. Each rotary blade 27 is configured to freely reciprocate in the paper surface direction in FIG. 6 by a motor 33 as a driving means, and is configured to rotate with the reciprocal movement.

  Further, the cutting device 28 is supported by the casing 28a so as to be swingable with respect to the device main body 2 by a support shaft 29 as a position adjusting means. The support shaft 29 is integrally provided with a guide member 30 that contacts the sheet 22 drawn into the casing 28a and guides the sheet 22 so that the posture of the sheet 22 is perpendicular to the blade portions 27a. . Further, a compression coil spring 31 is disposed outside the casing 28a as an urging means for applying an urging force in the clockwise direction in FIG. Further, instead of the guide member 25, a guide plate 32 made of a plate member is provided.

  According to the cutting device 28 having the above-described configuration, when the winding amount of the sheet 22 in the winding device 4 is small as shown in FIG. 7, or in the winding direction of the sheet 22 in the winding device 4 as shown in FIG. Even when the conveyance direction of the sheet 22 changes as in the case of the reverse direction, the casing 28a swings around the support shaft 29 according to the change in the conveyance direction of the sheet 22, and as a result, the sheet 22 On the other hand, since each blade part 27a can contact substantially perpendicularly, the cutting device 28 which always has a favorable cutting performance can be provided.

Further, since the cutting device 28 includes the guide member 30 for guiding the sheet 22, the posture of the sheet 22 with respect to each blade portion 27a can be stabilized, and the cutting performance can be further improved.
Moreover, since the guide member 30 can be reliably brought into contact with the sheet 22 by the compression coil spring 31, the stabilization of the posture of the sheet 22 by the guide member 30 can be improved, and stable cutting performance is provided. be able to.

  In the above embodiment and each modification, an example using a color printer as an image forming apparatus has been described. However, the image forming apparatus is not limited to this, and the present invention can be applied to a printer, a facsimile machine, a multifunction machine, and the like. . In this embodiment and the modification, the configuration using the sheet 22 as a recording medium on which an image is formed is shown. However, the sheet 22 is not limited to the recording paper, and is a cardboard, a postcard, an envelope, a plain paper, Also includes thin paper, coated paper (coated paper, art paper, etc.), tracing paper, OHP sheet, OHP film, resin film, etc. Also good.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to such specific embodiments, and unless specifically limited by the above description, the present invention described in the claims is not limited. Various modifications and changes are possible within the scope of the gist. The effects described in the embodiments of the present invention are merely examples of the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

1 Image forming device (inkjet recording device)
22 Recording medium (sheet)
27 Cutting member (rotating blade)
27a Blade portion 28 Cutting device 29 Position adjusting means (support shaft)
30 Guide member 31 Biasing means (compression coil spring)
33 Drive means (motor)

JP-A-8-99209

Claims (4)

A cutting member having a blade portion for cutting the recording medium;
Driving means for driving the cutting member;
Position adjusting means for adjusting a relative position of the cutting member with respect to the recording medium so that the blade portion takes an appropriate cutting position with respect to the recording medium in accordance with a change in a conveyance direction of the recording medium; Cutting device having. The cutting device according to claim 1, wherein
A cutting apparatus comprising a guide member for guiding the recording medium toward the blade portion. The cutting device according to claim 2, wherein
A cutting apparatus comprising biasing means for bringing the guide member into contact with the recording medium.   An image forming apparatus comprising: an image forming unit that forms an image; and the cutting device according to claim 1.

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