JP2005007540A - Cutting device for roll-shaped recording material, and image forming device equipped with that - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting device capable of certainly cutting roll-shaped recording material, without getting a moving blade under a fixed blade. <P>SOLUTION: A cutting edge 15A of a rotary disk blade is moved to a position over a polishing surface B of the fixed blade 15 so as to overlap each other, and overlap length L1 of the rotary disk blade 15 in regard to the fixed blade 13 is set to be 1.5 mm. In the fixed blade 13 and the rotary disk blade 15, angles between the polishing surfaces 13B, 15B and a reference surface is set to be 45°. The rotary disk blade 15 and the fixed blade are contacted with each other at a very small intersecting angle θ. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a roll-shaped recording material cutting apparatus and an image forming apparatus including the same.
[0002]
[Prior art]
In an image forming apparatus such as a copying machine, a printer, or a facsimile, for example, a roll-shaped recording sheet obtained by winding a recording material (hereinafter referred to as a recording sheet) such as paper, a plastic sheet, a cloth, an OHP sheet in a roll shape, What is provided with the cutting device which cut | disconnects to a desired size is known. Since the recording sheet wound in a roll shape can be cut in accordance with the length of the recording image, it is convenient for copying a long object. In particular, roll-shaped recording sheets are often used in industrial wide-width machines because they are easier to set in the case of wide-width copying and the like than recording sheets having a predetermined size.
[0003]
As such a roll-shaped recording material cutting device, there are known a type in which the fixed blade and the movable blade are arranged in contact with each other at right angles and a type in which the fixed blade and the movable blade are arranged in contact with each other in parallel. Yes.
[0004]
The cutting device arranged in contact with the fixed blade and the movable blade so as to make a right angle is longer than the width dimension of the recording sheet along the width direction of the recording sheet at a predetermined position in the recording sheet conveyance path. A fixed blade is provided, and a moving blade that slides along the edge of the fixed blade is known (see, for example, Patent Document 1). In this cutting apparatus, the fixed blade and the movable blade are arranged so as to form a right angle, and the recording sheet arranged along the blade surface of the fixed blade is moved along the cutting edge of the fixed blade. It is designed to cut with a cutting edge. In such a cutting device, the movable blade is attached to the carriage. The carriage cuts the recording sheet on one side, and the opposite side can run on the guide rail. The carriage is controlled to move in the width direction of the recording sheet via a wire that is stretched over a pulley whose rotation is controlled.
[0005]
Moreover, as a cutting device arrange | positioned so that a fixed blade and a movable blade (rotary round blade) may be in surface contact so that it may become parallel, there exists a thing as shown in FIG. FIG. 6 is a main part explanatory view schematically showing the cutting device 100. The fixed blade 101 of the cutting apparatus 100 is fixed to a fixed blade bracket 102 provided on the image forming apparatus main body side. The movable blade 103 is rotatable to a movable blade carriage 106 that slides on a guide rail unit 105 fixed to a guide rail bracket 104 that is disposed to face the fixed blade bracket 102 via a gap S that becomes a recording sheet conveyance path R. Is pivotally supported.
[0006]
As shown in FIG. 6, the movable blade 103 is arranged so that the peripheral edge protrudes from the movable blade carriage 106 toward the fixed blade 101. Further, as shown in FIG. 7, the cutting edge 103A of the moving blade 103 has a maximum dimension (hereinafter referred to as an overlap dimension) L1 that overlaps the fixed blade 101 from the cutting edge 101A of the fixed blade 101 is 0.5 mm or less. Is set to Incidentally, the diameter of the movable blade 103 is set to 25 mm. In addition, the planar projection distance L from the tip of the movable blade 103 to the region where the inclined blade edge polishing surface 101B exists from the blade edge 101A of the fixed blade 101 is set to about 0.5 mm.
[0007]
[Patent Document 1]
JP-A-8-229883 (page 3, FIGS. 5 and 6).
[0008]
[Problems to be solved by the invention]
However, in the above-described cutting device in which the fixed blade and the moving blade are arranged in contact with each other at a right angle, or in the cutting device of the type shown in FIGS. 6 and 7, the moving blade and the fixed blade are recorded. Since they face each other with a gap S serving as a sheet conveyance path, there may be inconveniences as described below.
[0009]
That is, in the above-described cutting apparatus, when the recording sheet is conveyed, a jam occurs if the recording sheet is fed in a state where wrinkles or ear folds are generated on the surface of the recording sheet. In this state, when the movable blade starts to move, the jam of the recording sheet on which the jam has occurred serves as a guide for the movable blade, the guide rail bracket 104 side where the guide rail unit 105 is provided, and the fixed blade bracket 102. A phenomenon occurs in which the side is expanded in the direction indicated by the thick arrows a and b shown in FIG. At that time, as shown in FIG. 8, if the movable blade 103 sinks below the fixed blade 101, the movable blade 103 becomes immovable and the recording sheet may not be cut.
[0010]
SUMMARY An advantage of some aspects of the invention is that it provides a cutting device that can reliably cut a roll-shaped recording material without a moving blade under the fixed blade, and an image forming apparatus including the cutting device.
[0011]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a fixed blade disposed over at least the entire width of the roll-shaped recording material conveyed along the recording material conveyance path, and the width of the recording material by moving while contacting the fixed blade. The present invention relates to a cutting device that cuts in a direction. The cutting apparatus according to the present invention is characterized in that the cutting edge of the movable blade is overlapped at least beyond the cutting edge polishing surface of the fixed blade.
[0012]
A second aspect of the present invention relates to a roll-shaped recording material cutting apparatus according to the first aspect. In the cutting device according to the present invention, the movable blade and the fixed blade are overlapped so that a cutting edge polishing surface formed on the cutting edge of the moving blade exceeds the cutting edge polishing surface of the fixed blade. It is a feature.
[0013]
A third aspect of the present invention relates to a roll-shaped recording material cutting apparatus according to the first or second aspect. The cutting device according to the present invention is characterized in that the movable blade and the fixed blade are in line contact so as to form an acute angle. .
A fourth aspect of the present invention relates to a roll-shaped recording material cutting device according to any one of the first to third aspects. The cutting device according to the present invention is characterized in that an overlapping dimension L of the movable blade and the fixed blade is 0.5 mm <L <1.6 mm.
[0014]
The invention described in claim 5 relates to an image forming apparatus. An image forming apparatus according to the present invention includes the cutting device according to any one of claims 1 to 4.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, details of a roll-shaped recording material cutting device and an image forming apparatus including the same according to an embodiment of the present invention will be described with reference to the drawings. 1 is a schematic configuration diagram of the image forming apparatus according to the present embodiment, FIG. 2 is a perspective view of the cutting device, FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, and FIG. FIG. 5 is a plan view showing the positional relationship between the rotating round blade and the fixed blade. However, it should be noted that the drawings are schematic and the ratio of dimensions of each member is different from the actual one. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings is contained.
[0016]
(Schematic configuration of image forming apparatus)
The cutting device for a roll-shaped recording material according to the present embodiment is characterized in that the cutting edge of the movable blade is overlapped at least beyond the cutting edge polishing surface of the fixed blade.
[0017]
First, the schematic configuration of the image forming apparatus 1 including functions will be described with reference to FIG. The image forming apparatus 1 according to the present embodiment stores a roll-shaped recording sheet 3 as a roll-shaped recording material in the image forming apparatus main body 2 in a rotatable manner, and includes a sheet feeding means such as a feed roller (not shown). Storage unit 4, cutting device 5 that cuts recording sheet 3A fed from roll storage unit 4 along the width direction at a desired size, and pinch roller that conveys recording sheet 3A cut by cutting device 5 6, an image forming unit 7 that records an image on the recording sheet 3 </ b> A conveyed by the pinch roller 6, a fixing unit 8 that fixes an image of the recording sheet 3 </ b> A on which an image is recorded, and a fixing unit 8 that performs fixing processing. The recording sheet 3 </ b> A is roughly constituted by various transport system members 10 that transport the recording sheet 3 </ b> A along the recording material transport path R to the paper discharge tray 9.
[0018]
(Configuration of Cutting Device) Next, the configuration of the cutting device 5 according to the present embodiment will be described. As shown in FIG. 2, the cutting device 5 includes an apparatus base plate 11 fixed to the image forming apparatus main body 2 side, a fixed blade mounting base 12 attached to the apparatus base plate 11, and the fixed blade mounting base 12. A movable blade carriage provided with a fixed blade 13 fixed on top, a guide plate 14 attached to the apparatus base plate 11, and a rotating round blade 15 as a movable blade provided so as to be able to travel along the guide plate 14 16 and a wire 18 wound around a pair of pulleys 17 for driving the movable blade carriage 16 along the guide plate 14.
[0019]
<< Structure of Device Base Plate >> First, the structure of the device base plate 11 will be described. The apparatus base plate 11 is an elongated, substantially rectangular plate disposed along the width direction W of the recording sheet 3A to be conveyed so as to block the recording material conveyance path R in the image forming apparatus main body 2. Note that the apparatus base plate 11 does not actually cut off the recording material conveyance path R, but has a sheet passage slit 19 through which the recording sheet 3A can pass (see FIGS. 2 and 3). As shown in FIG. 2, the sheet passage slit 19 is formed longer than the width dimension of the recording sheet 3A along the width direction W of the recording sheet 3A being conveyed. Further, the sheet passing slit 19 is disposed at a position slightly close to one long side of the apparatus base plate 11. For this reason, as shown in FIG. 3, the apparatus base plate 11 is partitioned into a fixed blade mounting portion 11 </ b> A having a narrow width and a guide plate mounting portion 11 </ b> B having a relatively wide width by a sheet passing slit 19. The apparatus base plate 11 is fixed to a predetermined portion of the image forming apparatus main body 2 by fixing means such as screwing or welding.
[0020]
<< Structure of Fixed Blade Mounting Base >> Next, the structure of the fixed blade mounting base 12 will be described. As shown in FIGS. 2 and 3, the fixed blade mounting base 12 is made of a metal such as aluminum and has a hollow rectangular tube shape. Further, the fixed blade mounting base 12 is placed and fixed along the longitudinal direction on a narrow fixed blade mounting portion 11 </ b> A defined by the sheet passing slit 19. Further, as shown in FIG. 3, the fixed blade mounting base 12 is located on the bottom of the apparatus base plate 11 facing the sheet passing slit 19 from the downstream side in the recording material conveying direction with respect to the sheet passing slit 19. A recording sheet guide plate portion 12A inserted toward the upstream side protrudes. The length of the recording sheet guide plate portion 12A in the longitudinal direction is set to be approximately the same as the length of the sheet passing slit 19 in the longitudinal direction. As shown in FIG. 3, the recording sheet guide plate portion 12 </ b> A is inclined so as to expand in the direction away from the recording material conveyance path R toward the leading edge.
[0021]
A fixed blade placement step 12B for placing the fixed blade 13 is formed on the upper surface of the fixed blade mount 12 facing the sheet passing slit 19.
[0022]
<Structure of fixed blade>
Next, the structure of the fixed blade 13 placed on the fixed blade placement step 12B will be described. As shown in FIGS. 2 and 3, the fixed blade 13 protrudes with the blade edge 13 </ b> A facing the sheet passage slit 19 and is formed on the blade edge portion on the fixed blade mounting step 12 </ b> B. 13B is placed so as to face diagonally downward. Incidentally, in the present embodiment, the edge angle at which the polishing surface 13B is formed is set to 55 °. As shown in FIG. 3, the fixed blade 13 is set slightly longer than the depth of the fixed blade mounting step 12 </ b> B, and the length in the longitudinal direction is equal to the length in the longitudinal direction of the fixed blade mounting base 12. It is set to the same length. In the present embodiment, the length of the fixed blade 13 is set to 1084 mm.
[0023]
The fixed blade 13 is pressed and fixed by a pressing plate 20 fixed on the fixed blade mounting base 12. Note that a jetty portion 20A that rises in the recording material conveyance direction R is formed at the front edge portion of the presser plate 20.
[0024]
<< Structure of Guide Plate >> Next, the structure of the guide plate 14 will be described. The guide plate 14 is mounted and fixed along the guide plate mounting portion 11B of the apparatus base plate 11, and is wider than the fixed blade mounting base 12 and has a fixed length in the longitudinal direction. It is set to be the same as the length of the blade mounting base 12 in the longitudinal direction. The guide plate 14 includes a first guide jetty 21 at an edge facing the sheet passing slit 19, and the first guide at a predetermined distance from the first guide jetty 21 in a direction opposite to the fixed blade mounting base 12. A second guide jetty 22 formed so as to be parallel to the jetty 21 is formed. Guide grooves 21A and 22A are formed on the opposing surfaces of the first and second guide jetty 21 and 22, respectively.
[0025]
<< Configuration of Moving Blade Carriage >> Next, the configuration of the moving blade carriage 16 will be described. As described above, the movable blade carriage 16 is driven to travel along the sheet passing slit 19 with respect to the guide plate 14.
[0026]
2 and 3, the movable blade carriage 16 includes a movable plate 23, a sliding block 24 provided integrally below the movable plate 23, and an unillustrated formed on the movable plate 23. A rotating round blade 15 in which a rotating shaft is rotatably inserted into the lower bearing portion, a cover plate 25 in which an upper bearing portion (not shown) is inserted, into which a rotating shaft protruding above the rotating round blade 15 is formed, and a cover plate And a shaft pressing plate 26 that is disposed on the upper surface 25 and biases the upper end of the rotary shaft 15 in the axial direction.
[0027]
Note that both end portions of the wire 18 to which a coil spring 27 as a buffer member is connected are fixed to both side portions of the moving plate 23 in the traveling direction. The wire 18 is stretched around a pulley 17 rotatably supported at both ends of the apparatus base plate 11. Further, one pulley 17 is interlocked with a rotation drive control system (not shown).
[0028]
<< Arrangement Relationship Between Rotating Round Blade and Fixed Blade >> Next, an arrangement relationship between the rotating round blade 15 and the fixed blade 13 in the cutting device 5 according to the present embodiment will be described with reference to FIGS. 4 and 5.
[0029]
In the present embodiment, as shown in FIGS. 4 and 5, the cutting edge 15 </ b> A of the rotary round blade 15 is aligned so as to overlap to a position beyond the polishing surface 13 </ b> B of the fixed blade 15. Specifically, in the present embodiment, the diameter of the rotary round blade 15 is set to 27 mm (conventionally 25 mm), and the overlap dimension L1 of the rotary round blade 15 with respect to the fixed blade 13 is set to 1.5 mm. Yes. The fixed blade 13 and the rotating round blade 15 both have an angle of 45 ° between the polishing surfaces 13B and 15B and the reference surface. In addition, in the present embodiment, as shown in FIG. 4, the rotating round blade 15 and the fixed blade 13 are in contact with each other so as to form an extremely small angle θ.
[0030]
In this way, by setting the conditions for aligning the rotary round blade 15 and the fixed blade 13, the recording sheet 3A is conveyed in the cutting device 5 in a state in which wrinkles or ear folds occur on the surface. Even if the jam occurs and the rotary round blade 13 moves along the heel or the like, the overlap size between the rotary round blade 15 and the fixed blade 13 is increased. It is possible to prevent dive into the lower side. If the overlap dimension is less than 1.5 mm, the rotary blade 15 may sink under the fixed blade 13. Further, it is not preferable to set the overlap dimension L1 between the rotating round blade 15 and the fixed blade 13 to 1.6 mm or more because the recording sheet 3A is wavy. Therefore, setting the overlap dimension L1 between the rotating round blade 15 and the fixed blade 13 in the range of 0.5 mm <L1 <1.6 mm can effectively prevent the cutting process from being hindered.
[0031]
When such an overlap dimension is set, the cutting edge of the rotating round blade 15 is overlapped beyond the cutting edge polishing surface of the fixed blade 13, and the length of the line contact between the rotating round blade 15 and the fixed blade 13 is reduced. It is getting longer. Further, since the rotary round blade 15 and the fixed blade 13 are not in surface contact, the rotational friction of the rotary round blade 15 can be reduced, and the recording sheet 3A can be cut smoothly.
[0032]
Further, as described above, since the rotary round blade 15 and the fixed blade 13 are in line contact so as to form a very small angle θ, the contact between the two blades at the two operation points S as shown in FIG. Can be improved.
[0033]
(Other embodiments)
Although the embodiment has been described above, the present invention is not limited to this, and various modifications accompanying the gist of the configuration are possible.
[0034]
For example, in the above-described embodiment, the rotating round blade 15 is applied as the moving blade, but a blade having another shape may be used. Further, the present invention can also be applied to a cutting device in which the rotating round blade 15 and the fixed blade 13 are arranged substantially at right angles.
[0035]
【The invention's effect】
As is clear from the above description, according to the present invention, it is possible to realize a cutting device that can reliably cut the roll-shaped recording material without the moving blades under the fixed blade.
[0036]
In addition, according to the present invention, it is possible to realize an image forming apparatus that can reliably cut the roll-shaped recording material and can reduce maintenance work.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an image forming apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view of a cutting device according to an embodiment of the present invention.
3 is a cross-sectional view taken along the line AA in FIG.
FIG. 4 is an explanatory side view of a main part showing an arrangement state of rotating round blades and fixed blades in the cutting apparatus according to the embodiment of the present invention.
FIG. 5 is an explanatory plan view of a main part showing an arrangement state of a rotating round blade and a fixed blade in the cutting apparatus according to the embodiment of the present invention.
FIG. 6 is a side view of an essential part showing a conventional cutting device.
FIG. 7 is a plan view of an essential part showing a conventional cutting device.
FIG. 8 is a side view of an essential part showing a state in which a movable blade has entered under a fixed blade in a conventional cutting device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus, 3 ... Roll-shaped recording sheet, 3A ... Recording sheet, 5 ... Cutting device, 11 ... Device base plate, 11A ... Fixed blade attaching part, 11B ... Guide plate attaching part, 12: Fixed blade mount, 13: Fixed blade, 13A: Cutting edge, 13B: Polishing surface, 14: Guide plate, 15: Rotary round blade, 15A: Cutting edge, 15B: Polishing surface, 16 ... Moving blade carriage

Claims (5)

A fixed blade disposed over at least the entire width of the roll-shaped recording material conveyed along the recording material conveyance path, and a cutting device that moves while contacting the fixed blade and cuts the recording material in the width direction. And
An apparatus for cutting a roll-shaped recording material, wherein the cutting edge of the movable blade is overlapped at least beyond the polishing surface of the fixed blade. The movable blade and the fixed blade are overlapped so that a cutting edge polishing surface formed on a cutting edge of the moving blade exceeds the cutting edge polishing surface of the fixed blade. Roll recording material cutting device. The roll recording material cutting apparatus according to claim 1 or 2, wherein the movable blade and the fixed blade are in line contact so as to form an acute angle. 4. The roll-shaped recording according to claim 1, wherein an overlap dimension L between the movable blade and the fixed blade is 0.5 mm <L <1.6 mm. 5. Material cutting device. An image forming apparatus comprising the cutting device according to claim 1.

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