JP2011115894A - Cutting device and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting device and image forming apparatus that prevent degradation of sheet discharge quality such as folding, bending or the like of a sheet that is caused by falling of a cut sheet in an oblique state. <P>SOLUTION: The cutting device cuts the sheet 1 with a cutting means 4 after carrying the sheet 1, which is supported by a discharge member 3, at a prescribed amount of length, while unrolling the sheet 1 that is rolled in a roll shape. The cutting device includes an auxiliary means 6 that imparts a force for preventing a rotation of the sheet 1, which occurs when cutting the sheet that is not supported by the discharge member 3, after completion of carrying of the sheet 1 at least in the starting side of cutting of the sheet. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cutting device that cuts a sheet wound in a roll shape and an image forming apparatus that uses a sheet wound in a roll shape as a recording medium. In particular, the sheet cut into a predetermined length is slanted. The present invention relates to a cutting device and an image forming apparatus that reduce falling on the surface.

  2. Description of the Related Art Some conventional cutting apparatuses or image forming apparatuses that use a sheet wound in a roll shape drop and discharge the cut sheet by its own weight. In such an apparatus, when the cutter cuts the sheet from the standby position that is the cutting start position to the cutting end position, the boundary between the cutting end portion and the uncut portion at the cutting position (5 cut lines) on the sheet is determined. At the fulcrum, the side where the sheet is cut off tries to rotate by its own weight. That is, the side where the sheet is separated hangs obliquely downward due to its own weight. In this state, the completely cut sheet falls in an oblique state (hereinafter also referred to as oblique fall), leading to a reduction in the discharge quality due to sheet folding or the like. Further, in the case of an image forming apparatus in which a cutter is mounted on the carriage of the recording head, if the side of the sheet that is cut off hangs obliquely downward due to its own weight during cutting, the tip of the side of the sheet that is left uncut rises, and the recording head ejects ink. There is a possibility of contact between the surface and the sheet. For this reason, there is a possibility that the recording surface of the sheet to be discharged next becomes dirty or the recording head is destroyed.

  In order to prevent this, for example, Patent Document 1 discloses a method in which a friction member disposed in the width direction of the recording medium is provided on the conveyance surface of the paper discharge member, and the slant drop is reduced by this friction member. .

JP 2006-212784 A

However, in the configuration of Patent Document 1, since the friction member is always in contact with the recording medium, due to long-term use of the apparatus, the friction member is worn due to friction with the recording medium, adhesion of paper dust, or the like. There is a possibility that the friction coefficient becomes small and a sufficient effect cannot be obtained. as a result,
Accordingly, an object of the present invention is to realize a cutting apparatus and an image forming apparatus that prevent a cut sheet from falling in an oblique state and thereby preventing a discharge quality from being deteriorated due to sheet folding or the like.

  Therefore, the cutting device of the present invention is a cutting device for cutting the sheet by a cutting means after unwinding the sheet wound in a roll shape and conveying the sheet supported by the discharge member by a predetermined amount. After completion of conveyance, at least a cutting start side of the sheet is provided with an auxiliary unit that applies a force that prevents rotation of the sheet that is not supported by the discharge member that is generated at the time of cutting.

  In addition, an image forming apparatus according to the present invention includes the cutting device.

  According to the present invention, the cutting apparatus and the image forming apparatus include auxiliary means for applying a force that prevents rotation of the sheet that is not supported by the discharge member generated at the time of cutting, at least on the sheet cutting start side after the conveyance of the sheet is completed. . Accordingly, it is possible to realize a cutting apparatus and an image forming apparatus that prevent the discharged sheet from being deteriorated due to the sheet being folded or the like due to the cut sheet falling in an oblique state.

It is the perspective view which showed the outline of the cutting device which can apply the 1st Embodiment of this invention. It is the perspective view which showed the outline of the cutting device which can apply the 1st Embodiment of this invention. It is the perspective view which showed the outline of the cutting device which can apply the 1st Embodiment of this invention. 1 is a perspective view showing an image forming apparatus to which the present invention is applied. (A), (b) is the schematic of the cutting device which can apply the 2nd Embodiment of this invention. (A), (b) is the schematic of the cutting device which can apply the 3rd Embodiment of this invention. (A), (b) is the schematic of the cutting device which can apply the 4th Embodiment of this invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
1 to 3 are perspective views showing an outline of a cutting apparatus to which the first embodiment of the present invention can be applied. A roll-shaped sheet (hereinafter also simply referred to as a sheet) 1 is held by a shaft holding member (not shown) so as to be freely wound. The conveyance mechanism 2 includes a roller pair of a driving roller 21 that is rotated by a driving source (not shown) and a driven roller 22 that is in pressure contact with the driving roller 21. A discharge member 3 is provided behind the roller pair in the conveying direction of the sheet 1 and supports the sheet 1 as a guide for the discharged sheet 1. The left side in the conveyance direction of the sheet 1 in the discharge member 3 is a standby position of the cutter 4 that cuts the sheet 1, and the cutter 4 is provided so as to cut the sheet 1 while crossing the discharge member 3. Yes. A discharge auxiliary member 6 is provided on the standby position side (right side in FIG. 1) of the cutter 4 on the sheet guide surface of the discharge member 3. The discharge assisting member 6 is held so as to be moved upward by a drive source (not shown). While the sheet 1 is being conveyed by the conveyance mechanism 2, the discharge assisting member 6 is held as a part of a support surface that supports the sheet 1 as a part of the discharge member (conveying position). When the sheet 1 is discharged to a predetermined length and the sheet 1 is cut after the conveyance is finished, the discharge auxiliary member is driven by a driving source (not shown) before the cutter 4 starts cutting (when the cutter 4 is in the standby position). 6 moves upward (cutting position), and then cutting is started (see FIG. 2). The discharge assisting member 6 is held at this cutting position during the cutting of the sheet 1. After the sheet 1 is completely cut, the discharge assisting member 6 is moved to the transport position by a drive source (not shown), and is integrated with the discharge member again to function as a part of the discharge guide.

  When the sheet 1 is cut by the cutter 4, the separated side tends to rotate by its own weight with the boundary between the cut end portion and the uncut portion on the cut line in the sheet 1 as a fulcrum (the separated side hangs obliquely). However, in this embodiment, the sheet 1 is lifted upward by the discharge assisting member 6 when being cut. For this reason, it takes time for the cutting start side to be held by the discharge assisting member 6 on the upstream side in the conveying direction of the side from which the sheet 1 is cut (sheet 1 cutting portion), and for the sheet 1 cutting portion to hang obliquely. In other words, the discharge assisting member 6 applies a force to the partially cut sheet 1 in a direction that prevents the sheet 1 cutting portion from rotating, thereby attempting to move along with the cutting of the sheet 1. The center of gravity of the cut portion of the sheet 1 is held in the state before cutting. In this way, by maintaining the posture of the sheet 1 before, during, and after cutting, the sheet 1 cutting part is delayed from hanging down obliquely, and the cut part of the cut sheet 1 is slantingly dropped. It is possible to fall by its own weight while reducing (see FIG. 3).

  In this embodiment, an example in which one discharge assisting member 6 that is a part of the discharge member 3 is raised is shown, but the present invention is not limited to this. That is, it is only necessary to maintain the center of gravity of the sheet 1 cutting portion to be moved along with the cutting of the sheet 1 by applying a force in a direction that prevents the sheet 1 cutting portion from rotating. For example, a plurality of discharge auxiliary members having a predetermined width dimension (for example, about one tenth of the width direction dimension of the discharge member 3) may be arranged in the width direction of the discharge member 3 at a predetermined interval.

  FIG. 4 is a perspective view showing an image forming apparatus to which the present invention is applied. When the present embodiment is applied to an image forming apparatus, image formation is performed on the sheet 1 while the recording unit 9 moves as the sheet 1 is conveyed, and the cutter 4 performs cutting after the image formation is completed. In the cutting, the discharge assisting member 6 may be operated as described above to perform the cutting.

  In this way, the discharge assisting member 6 provided on the discharge member 3 is raised at the time of cutting the sheet to delay the sheet 1 cutting portion from hanging down obliquely. As a result, it was possible to realize a cutting device and an image forming apparatus that prevent the discharged sheet from being deteriorated due to the sheet being folded or the like due to the cut sheet falling in an oblique state.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. Since the basic configuration of the present embodiment is the same as that of the first embodiment, only the characteristic configuration will be described below.

  FIGS. 5A and 5B are schematic views of a cutting apparatus to which the second embodiment of the present invention can be applied. In the present embodiment, a friction member 8 that protrudes downstream in the sheet conveying direction is provided at the end of the discharge member 3. The discharge member 3 is provided with a discharge auxiliary member 60 as an operating member. When the sheet 1 is conveyed, the discharge assisting member 60 is in a position to cover the friction member 8. When the sheet is cut after the sheet is conveyed, the discharge assisting member 60 moves relative to the discharge member 3 toward the upstream side in the conveying direction. Thus, the friction member 8 is exposed. By exposing the friction member 8 when the sheet 1 is cut, a large frictional force is generated between the sheet 1 cutting portion and the friction member 8, and the sheet 1 cutting portion can be delayed from hanging down obliquely. That is, by applying a force in a direction that prevents the cutting portion of the sheet 1 from rotating to the partially cut sheet 1 by the friction member 8, the sheet that is going to move as the sheet 1 is cut. The center of gravity of one cutting part is held in the state before cutting.

  In this way, the friction member 8 provided on the discharge member 3 is exposed when the sheet 1 is cut, and the sheet 1 cutting portion is delayed from hanging down obliquely. As a result, it was possible to realize a cutting device and an image forming apparatus that prevent the discharged sheet from being deteriorated due to the sheet being folded or the like due to the cut sheet falling in an oblique state.

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. Since the basic configuration of the present embodiment is the same as that of the first embodiment, only the characteristic configuration will be described below.

  FIGS. 6A and 6B are schematic views of a cutting apparatus to which the third embodiment of the present invention can be applied. In the present embodiment, the discharge member 3 is provided with a discharge auxiliary member 61 on the cutting start side downstream in the sheet 1 conveyance direction. The discharge assisting member 61 is held so as to be moved above the discharge member 3 by a driving source (not shown), and is held as a part of the discharge guide while the sheet 1 is being conveyed by the conveyance mechanism 2 ( Transport position). When the sheet 1 is discharged to a predetermined length and the sheet 1 is cut after the conveyance is stopped, the discharge auxiliary member 61 is driven by a drive source (not shown) before the cutter 4 starts cutting (when the cutter 4 is in the standby position). Moves upward (cutting position), and then the cutter 4 starts cutting. During the cutting of the sheet 1, the discharge assisting member 61 is held at this cutting position. After the sheet 1 is completely cut, the discharge assisting member 61 is moved to the transport position by a drive source (not shown) and is held again as a part of the discharge guide.

  When the sheet 1 is cut, the discharge assisting member 61 provided on the cutting start side is moved upward to delay the sheet 1 cutting portion from hanging down obliquely. That is, the discharge assisting member 61 applies a force to the partially cut sheet 1 in a direction that prevents the sheet 1 cutting portion from rotating, thereby attempting to move as the sheet 1 is cut. The center of gravity of the cut portion of the sheet 1 is held in the state before cutting. In this way, by maintaining the posture of the sheet 1 before, during, and after cutting, the sheet 1 cutting part is delayed from hanging down obliquely, and the cut part of the cut sheet 1 is slantingly dropped. It is possible to fall by its own weight while reducing the weight.

  In the present embodiment, there is one discharge auxiliary member 61 on the cutting start side, but this is not a limitation, and there are a plurality of members having a predetermined width dimension (for example, about one-tenth of the width direction dimension of the discharge member 3). The discharge member 3 may be arranged in the width direction at a predetermined interval.

  Further, even when the entire discharge member 3 is displaced upward while lifting the cutting start side of the discharging member 3 relatively upward from the cutting end side, the same effect can be obtained.

  In this way, the discharge assisting member 61 provided on the discharge member 3 is raised at the time of cutting the sheet, and the sheet 1 cutting portion is delayed from hanging down obliquely. As a result, it was possible to realize a cutting device and an image forming apparatus that prevent the discharged sheet from being deteriorated due to the sheet being folded or the like due to the cut sheet falling in an oblique state.

(Fourth embodiment)
The fourth embodiment of the present invention will be described below with reference to the drawings. Since the basic configuration of the present embodiment is the same as that of the first embodiment, only the characteristic configuration will be described below.

  FIGS. 7A and 7B are schematic views of a cutting apparatus to which the fourth embodiment of the present invention can be applied. In the present embodiment, a discharge assisting member 62 is provided on the discharge member 3 on the cutting start side downstream in the sheet 1 conveyance direction. The discharge assisting member 62 is held so as to be extendable downstream of the discharge member 3 in the sheet 1 conveyance direction by a drive source (not shown), and as a part of the discharge guide while the sheet 1 is conveyed by the conveyance mechanism 2. It is held (conveying position). When the sheet 1 is discharged to a predetermined length and the sheet 1 is cut after the conveyance is stopped, the discharge auxiliary member 62 is driven by a driving source (not shown) before the cutter 4 starts cutting (when the cutter 4 is in the standby position). Is extended downstream of the sheet 1 conveyance direction (cutting position). Thereafter, the cutter 4 starts cutting the sheet 1. During the cutting of the sheet 1, the discharge assisting member 62 is held at this cutting position. After the sheet 1 is completely cut, the discharge assisting member 62 is moved to the transport position by a drive source (not shown) and is held again as a part of the discharge guide.

  When the sheet 1 is cut, the discharge auxiliary member 62 provided on the cutting start side is extended to the downstream side in the sheet 1 conveyance direction, thereby delaying the sheet 1 cutting portion from hanging down obliquely. In other words, the discharge assisting member 62 applies a force to the partially cut sheet 1 in a direction that prevents the sheet 1 cutting portion from rotating, thereby attempting to move as the sheet 1 is cut. The center of gravity of the cut portion of the sheet 1 is held in the state before cutting. In this way, by maintaining the posture of the sheet 1 before, during, and after cutting, the sheet 1 cutting part is delayed from hanging down obliquely, and the cut part of the cut sheet 1 is slantingly dropped. It is possible to fall by its own weight while reducing the weight.

  In the present embodiment, there is one discharge auxiliary member 62 on the cutting start side, but this is not a limitation, and there are a plurality of members having a predetermined width dimension (for example, about one-tenth of the width direction dimension of the discharge member 3). The discharge member 3 may be arranged in the width direction at a predetermined interval.

  In this way, the discharge auxiliary member 61 provided on the discharge member 3 at the time of cutting the sheet is extended to the downstream side in the sheet 1 conveyance direction to delay the sheet 1 cutting portion from hanging down obliquely. As a result, it was possible to realize a cutting device and an image forming apparatus that prevent the discharged sheet from being deteriorated due to the sheet being folded or the like due to the cut sheet falling in an oblique state.

DESCRIPTION OF SYMBOLS 1 Sheet 2 Conveyance mechanism 3 Discharge member 4 Cutter 6 Discharge auxiliary member 60 Discharge auxiliary member 61 Discharge auxiliary member 62 Discharge auxiliary member

Claims (8)

In a cutting device for cutting the sheet by a cutting means after unwinding the sheet wound in a roll shape and conveying the sheet supported by the discharge member by a predetermined amount,
A cutting apparatus comprising: an auxiliary unit that applies a force that prevents rotation of the sheet that is not supported by the discharge member that is generated at the time of cutting, at least on a cutting start side of the sheet after completion of conveyance of the sheet.   The cutting apparatus according to claim 1, wherein the auxiliary unit is provided on the discharge start side of the sheet in the discharge member.   The cutting according to claim 1 or 2, wherein the auxiliary member forms a part of a support surface on which the discharge member supports the sheet, and moves upward after the conveyance of the sheet is completed. apparatus.   The auxiliary member is provided at an end of the discharge member, is covered with an operating member when the sheet is conveyed, and is exposed after the conveyance of the sheet is completed. 2. The cutting device according to 2.   The cutting apparatus according to claim 4, wherein a frictional force between the auxiliary member and the sheet is larger than a frictional force between the operating member and the sheet.   The cutting apparatus according to claim 1, wherein the auxiliary member is provided at an end portion of the discharge member and moves upward after the conveyance of the sheet is completed.   3. The cutting apparatus according to claim 1, wherein the auxiliary member is provided at an end portion of the discharge member and moves in a conveyance direction of the sheet after completion of conveyance of the sheet.   An image forming apparatus comprising the cutting device according to claim 1.

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