JP6581421B2 - Sheet cutter - Google Patents

Description

  The present invention relates to a sheet cutter for cutting a sheet-like workpiece such as paper or plastic film.

  Conventionally, various sheet cutters are used for cutting sheets. For example, a sheet cutter is known that cuts a sheet into a so-called guillotine type by driving a movable blade forward and backward with respect to a fixed blade having a straight blade portion (see, for example, Patent Document 1). Further, a paper cutting machine that cuts paper on a mounting table by manually sliding a rotating round blade along a fixed blade is known (for example, see Patent Document 2).

  The inventors of the present application have previously proposed a sheet cutting device that cuts a sheet bundle with flat blades intersecting with each other and a substantially circular rotary blade (see, for example, Patent Document 3). In this sheet cutting apparatus, while the flat blade is moved along the cutting line, the rotating blade is rotated or swung in the direction opposite to the traveling direction, thereby reducing the cutting jam caused by the cutting paper pieces being clogged between the blade edges. Thus, the cutting load is reduced to achieve smooth cutting and excellent cutting quality.

Japanese Patent Laid-Open No. 10-315184 JP 2006-198739 A Japanese Patent Laying-Open No. 2015-116641

  In general, a sheet cutter is cut by bringing two cutting blades into pressure contact with each other with their blade edges crossing each other, and applying pressure at this intersection to cause the blade edge to bite into the sheet. However, if the sheet deviates from an appropriate orientation, posture, or angle with respect to the cutting edge of the cutting blade, slipping or catching occurs between them, causing a paper jam that cannot be cut, or along the planned cutting line. There was a problem that it could not be cut correctly.

  Therefore, the present invention has been made in view of the above-described conventional problems, and the purpose thereof is to always cut a sheet by appropriately arranging the sheet to be cut with respect to the cutting edge of the cutting blade. It is another object of the present invention to provide a sheet cutter that prevents clogging of the sheet at the cutting blade and always enables smooth cutting and excellent cutting quality.

In order to achieve the above object, the sheet cutter of the present invention
A sheet placement surface for placing one or more sheets to be cut;
A cutter unit having a holder member that travels along a cutting position and at least a pair of upper and lower cutting blades attached to the holder member in order to cut the sheet on the sheet placement surface along a predetermined cutting position. And
The holder member holds the portion of the sheet extending from the sheet placement surface to the opposite side beyond the cutting position in front of the cutting blade as viewed in the traveling direction, at least partially at the same height as the sheet placement surface. It has the sheet | seat lifting part for doing.

  Thus, by holding the uncut portion of the sheet on the opposite side beyond the cutting position from the sheet placement surface by the sheet lifting portion, the sheet can always be properly disposed with respect to the cutting edge of the cutting blade. The sheet can be smoothly cut from one end to the other end with high cutting quality without causing clogging on the way.

  In one embodiment, the configuration of the cutter unit, particularly the holder member, can be simplified by configuring the sheet lifting portion from an arm-shaped member extending a predetermined length on the opposite side of the sheet placement surface. it can.

  In another embodiment, when the holder member reciprocates along the cutting position, the cutter unit has two pairs of cutting blades, and when the pair of cutting blades travel in one direction, the other pair of cutting blades When traveling in the other direction, each sheet is cut, and each pair of cutting blades is disposed in front of each pair of the cutting blades in the traveling direction. Thus, a sheet can be cut by moving the holder member in one direction, and then the next sheet can be cut by running in the opposite direction, so that the sheet can be cut continuously and efficiently. it can. Moreover, even if the sheet is cut from any direction, high cutting quality can be obtained.

  In one embodiment, the pair of cutting blades includes a first cutting blade made of a flat blade and a second cutting blade made of a round blade, and the first cutting blade and the second cutting blade are Are arranged vertically so that their cutting edges intersect each other at an acute angle. By running such a cutting blade along the cutting position, the sheet can be smoothly cut with high cutting quality.

  In another embodiment, the holder member further includes a sheet push-down portion that pushes down a separation portion of the sheet that has been cut by the cutting blade, behind the cutting blade in the traveling direction. Accordingly, it is possible to eliminate the possibility that the cut portion of the cut sheet is hooked on the traveling cutter unit to bend or bend, and the cutting of the smooth sheet or the traveling of the cutter unit is hindered.

According to another aspect of the sheet cutter of the present invention,
A sheet placement surface for placing one or more sheets to be cut;
A cutter unit having a holder member that travels along a cutting position and at least a pair of upper and lower cutting blades attached to the holder member in order to cut the sheet on the sheet placement surface along a predetermined cutting position. When,
A pressing member for pressing the sheet against the sheet placement surface,
The lower cutting blade has a cutting edge that protrudes upward from the sheet placement surface so that the uncut portion of the sheet extending from the sheet placement surface to the opposite side beyond the cutting position can be lifted,
The pressing member has an elastic sheet material for pressing the sheet against the sheet placement surface from above, and the elastic sheet material has a portion extending from the pressing member to slightly before the cutting position. The extension portion is elastically deformable upward by an uncut portion of the sheet lifted by the lower cutting blade.

  In the uncut portion of the sheet lifted by the lower cutting blade of the cutter unit, the elastic force generated in the extended portion of the elastic sheet material due to the upward elastic deformation is applied downward to the cutting edge of the lower cutting blade. Acts like pressing. Therefore, the sheet can be satisfactorily cut along the planned cutting line by friction cutting with the lower cutting blade.

The whole perspective view which shows the sheet cutter of this embodiment from back. The top view of the sheet cutter of FIG. The rear view of the sheet cutter of FIG. Sectional drawing of the sheet cutter in the IV-IV line of FIG. The partial expansion perspective view of one sheet edge holding part. The front view of a cutter unit. The right view of a cutter unit. The perspective view of the cutter unit which shows the state at the time of sheet cutting. The partial enlarged plan view of the sheet cutter of FIG. 1 which looked at the cutter unit from the top. (A) The figure is the elements on larger scale which show the positional relationship of the 1st cutting blade and the 2nd cutting blade, (b) The figure is sectional drawing in the XX line. (A) The figure is the elements on larger scale similar to FIG. 10 (a) which shows the state of cutting a single sheet or a small number of sheets, and (b) is a cross-sectional view taken along the line XI-XI. (A) A figure is the elements on larger scale similar to FIG. 10 (a) which shows the state which cuts many sheets, (b) The figure is sectional drawing in the XII-XII line. (A)-(c) figure is explanatory drawing which shows the cutting state of the one edge part of the sheet | seat by the cutter unit to drive | work in order of a process from the back side of a sheet cutter. (A)-(c) is explanatory drawing which shows the cutting state of the other edge part of the sheet | seat by the cutter unit to drive | work in order of a process from the back side of a sheet cutter.

  Hereinafter, a sheet cutter according to the present invention will be described in detail based on preferred embodiments with reference to the accompanying drawings. In the accompanying drawings, similar components are denoted by the same reference numerals throughout the present specification.

  The sheet cutter 1 of the present embodiment shown in FIGS. 1 to 3 is a so-called desktop type that is manually operated to cut a sheet. As shown in the figure, the sheet cutter 1 includes a rectangular flat plate-shaped mounting table 2 for mounting a single sheet or a plurality of sheets S to be cut. On both the left and right sides of the mounting table 2, side frames 3 a and 3 b that are substantially L-shaped when viewed from the side are integrally provided. The portions of the side frame portions 3a and 3b that are rearward of the mounting table 2 that are L-shaped vertical portions extend upward to form left and right support frame portions 4a and 4b. In the present embodiment, the front side in the plan view of FIG. 2 will be described as the front, the back side as the rear, and the left and right sides as the left and right sides.

  The sheet placement surface 2a, which is the upper surface of the placement table 2, has a certain height between the side frame portions so as to be somewhat lower than the side frame portions 3a, 3b along the left and right sides 5a, 5b. Step is provided. This level difference is provided by making the sides of the sheet S placed on the sheet placement surface 2a to be aligned and set as the left and right reference positions, and is slightly higher than the number of sheets that can be cut by the sheet cutter 1. Set to

  As shown in the cross-sectional view of FIG. 4, a sheet guide plate 6 is disposed immediately behind the mounting table 2, and a sheet guide surface 7 that is flush with the sheet mounting surface is formed continuously with the sheet mounting surface 2a. Defined. Above the sheet guide surface 7, there are a cutter guide mechanism 8 for guiding a cutter unit, which will be described later, in the left-right direction with respect to the main body of the sheet cutter 1, and a sheet pressing mechanism 9 for pressing the sheet S onto the sheet guide surface. The support frame portions 4a and 4b are provided.

  The cutter guide mechanism 8 includes a guide rod 11 made of a circular rod member that is horizontally installed between the support frame portions 4a and 4b. The guide rod 11 is disposed above the support frame portions 4 a and 4 b and slightly ahead of the rear end of the sheet guide surface 7. Accordingly, as shown in FIG. 2, when the sheet cutter 1 is viewed from above, the rear edge of the sheet guide surface 7 can be visually confirmed.

  The cutter guide mechanism 8 further includes a guide rail 12 that protrudes downward on the lower side of the sheet guide plate 6 and is horizontally formed between the side frame portions 3a and 3b. The guide rail 12 is also disposed slightly forward from the rear end of the seat guide surface 7. As shown in FIG. 4, the guide rod 11 and the guide rail 12 are arranged so as to coincide with each other on the substantially same line in the vertical direction.

  The sheet pressing mechanism 9 includes a pressing plate 13 for pressing the sheet S on the sheet guiding surface 7 against the sheet guiding surface from above, and an operation lever 14 for operating pressing and releasing of the sheet by the pressing plate. Is provided. The pressing plate 13 has a horizontal and flat lower surface facing the sheet guide surface over substantially the entire left and right width of the sheet guide surface 7, and a plurality of vertical actuating rods 15 arranged at predetermined intervals in the left-right direction. It is attached and supported at the lower end. The operating rod 15 passes through a U-shaped fixed frame 16 extending horizontally in the left-right direction so as to be movable in the vertical direction, and the operating rod 15 is connected between the connecting portion 17 fixed on the upper portion and the fixed frame 16. It is biased and supported upward by a compression coil spring 18 that is externally inserted into the compression coil spring 18.

  A relatively thin flexible elastic sheet material 20 is attached to the lower surface of the pressing plate 13 over substantially the entire surface thereof. The elastic sheet material 20 has a rear end portion 20a extending a little rearward from the rear end of the pressing plate 13 to a short distance from the rear end of the sheet guide surface 7, that is, slightly before the cutting position. Yes. As the elastic sheet material 20, for example, a rubber sheet made of a rubber material such as natural rubber or synthetic rubber, or a synthetic resin sheet made of a synthetic resin material such as polyester can be used.

  The operation lever 14 has a base end, that is, a rear end portion, which is fixed to a movable frame 19 that extends horizontally between the support frame portions 4 a and 4 b and is coupled to the connecting portion 17 of the operating rod 15. The movable frame 19 has ends 19a and 19b of arms that extend rearward from the left and right ends of the movable frame 19 that are rotatably fitted to the left and right ends of the guide rod 11, respectively, so that the movable frame 19 can swing around the guide rod. It is attached.

  Accordingly, when the operation lever 14 is pushed down by hand, the operating rod 15 is lowered against the urging force of the compression coil spring 18, and the elastic sheet material 20 is pressed against the upper surface of the sheet S by the pressing plate 13, thereby guiding the sheet. The surface 7 can be pressed. By interposing the elastic sheet material 20 at that time, it is possible to apply a sufficient pressure to the sheet guide surface 7 without leaving or damaging the sheet S on its upper surface. When the hand is released from the operation lever 14, the actuating rod 15 is lifted by the urging force of the compression coil spring 18, and the pressing plate 13 is separated from the upper surface of the sheet S and returns to the original upper position.

  Immediately behind the left and right ends of the sheet guide plate 6 are adjacent sides of a sheet portion that extends rearward from the rear end of the sheet guide surface when the sheet S to be cut is placed on the sheet guide surface 7. Sheet edge holding portions 21a and 21b for holding the edges are provided. The sheet edge holding portions 21a and 21b are provided symmetrically on the inner wall surfaces facing the side frame portions 3a and 3b, respectively. Here, in order to simplify the description, one sheet edge holding portion 21a will be described with reference to FIG.

  The sheet edge holding portion 21a (21b) is directed toward the mounting stay 22a (22b) fixed to the inner wall surface of the side frame portion 3a (3b) and the other sheet edge holding portion 21b (21a) facing from the front end thereof. And swinging fingers 23a (23b) extending horizontally. The swing finger 23a (23b) is normally held at a horizontal position by a spring 24a (24b) built in the tip of the mounting stay 22a (22b) at the base end thereof, and is vertically moved in a certain range downward from the horizontal position. Is swingably attached.

  At the tip of the swing finger 23a (23b), a lower sheet support claw 25a (25b) and an upper sheet pressing claw 26a (26b) are integrally formed with a predetermined vertical gap 27 apart. Yes. The vertical dimension of the gap 27 is set to be slightly larger than the total thickness of the number of sheets that can be cut by the normal sheet cutter 1. The height of the upper surface of the sheet support claw 25a (25b) is set to be substantially the same as that of the sheet guide surface 7.

  In order to facilitate the insertion of the sheet S into the gap 27, the swing finger 23a (23b) of FIG. 5 is provided with a length of the sheet pressing claw 26a (26b) somewhat shorter than the length of the sheet support claw 25a (25b). It has been. Further, as will be described later, the upper surface of the tip of the swing finger 23a (23b) is formed in a taper shape that becomes lower toward the tip in order to make it easier to push the swing finger downward by the traveling cutter unit. .

  A cutter unit 31 is mounted behind the sheet pressing mechanism 9 by the cutter guide mechanism 8 so as to be able to reciprocate between the support frame portions 4a and 4b. As shown in FIG. 6, the cutter unit 31 is configured symmetrically so that the sheet can be cut even if it travels in either the left or right direction.

  As shown in FIGS. 6 to 8, the cutter unit 31 includes a holder member 32 and first and second blade members 33 and 34. The holder member 32 includes a first holder member 35 for attaching the cutter unit 31 to the guide rod 11 so that the cutter unit 31 can run, and a second holder member 36 for attaching and holding the first and second blade members 33 and 34. Is done. The upper first holder member 35 and the lower second holder member 36 are formed of, for example, a synthetic resin material and are integrally coupled to each other with a screw 37. Thereby, when the 1st or 2nd blade member 33,34 is worn out or damaged, the cutter unit 31 can be removed with the 2nd holder member 36, and can be replaced | exchanged easily.

  A guide hole 38 through which the guide rod 11 is slidably inserted is formed in the upper front portion of the first holder member 35 so as to cross the first holder member horizontally. As shown in the drawing, the lower end of the guide hole 38 is formed with a downward narrow groove 38a and is open to the outside. On the 1st holder member 35, the operation tab 39 for grasping by hand when driving the cutter unit 31 is integrally fixed.

  A guide groove 40 for slidably fitting the guide rail 12 is recessed in the lower front portion of the second holder member 36 so as to cross the second holder member horizontally. The cutter unit 31 fits the guide hole 38 to the guide rod 11 and fits the guide groove 40 to the guide rail 12 so that it does not rattle from front to back and from side to side and from side to side. It is mounted so that it can travel freely and smoothly in any direction.

  As described above, since the guide rod 11 is disposed in front of the rear edge of the sheet guide surface 7, the sheet cutter 1 is placed on the sheet guide surface 7 when viewed from above as shown in FIG. The planned cutting line Ls of the sheet S is visually observed. Therefore, the sheet S can be accurately cut at a desired position by aligning the planned cutting line Ls with the cutting position defined by the rear edge of the sheet guide surface 7.

  The first blade member 33 is formed of a generally inverted trapezoidal flat blade member, and first cutting blades 41a and 41b are formed on the left and right sides inclined at a predetermined angle inwardly downward. The second blade member 34 is composed of two thin disk-like round blades (circular blades), and the second blades 34a and 34b are respectively formed with second cutting blades 42a and 42b over the entire periphery. Has been.

  As shown in FIG. 6, the first blade member 33 is fixed to the second holder member 36 with a screw 43 and arranged at the center in the left-right direction of the cutter unit 31. The second blade members 34a and 34b are disposed so as to partially overlap the right and left sides of the corresponding first cutting blades 41a and 41b of the first blade member 33. Each of the second blade members 34a and 34b is fixed to the second holder member 36 with screws 44a and 44b, and is biased outward by a spring (not shown) built in the screw hole.

  The second holder member 36 is provided with sheet lifting arms 46a and 46b, respectively, separated from the second blade members 34a and 34b by a small distance outwardly from the left and right sides. The sheet lifting arms 46a and 46b extend horizontally from the second holder member 36 toward the rear at substantially the same height as the second blade member.

  The tip portions 47a and 47b of the sheet lifting arms 46a and 46b are bent upward and obliquely inward. The lower surfaces of the seat lifting arms 46a and 46b are inclined outward and downward over substantially the entire length. The upper surfaces of the sheet lifting arms 46a and 46b are horizontally and flatly formed between the base ends and the distal end portions 47a and 47b, and the adjacent wall surfaces of the second holder member 36 when viewed from the side as shown in FIG. A space having a size that allows the sheet edge holding portions 21a and 21b to pass therethrough is defined.

  Further, the second holder member 36 is integrally formed with a sheet pressing portion 48 that protrudes rearward with a predetermined thickness immediately behind the first blade member 33. As shown in FIG. 6, the sheet pressing portion 48 has an inverted isosceles triangle shape in which the left and right sides 48 a and 48 b are inclined relatively gently when viewed from the rear, and the apex 48 c, that is, the lower end is the left-right direction of the cutter unit 31 It is arranged so that it is located in the center and the upper ends of the left and right sides are located slightly higher than the leading ends 47a and 47b of the sheet lifting arms 46a and 46b.

  10A and 10B show the positional relationship between one first cutting blade 41a of the first blade member 33 and the second cutting blade 42a of the second blade member 34a adjacent thereto, and the cutting blade and the sheet. The positional relationship with the guide surface 7, the pressing plate 13, and the elastic sheet material 20 is shown. FIG. 10B is a cross-sectional view taken along line XX passing through the intersection point P0 between the sheet guide surface 7 and the second cutting blade 42a. In addition, since the positional relationship between the other first cutting blade 41b and the second cutting blade 42b is symmetrical and substantially the same, description thereof is omitted.

  The second blade member 34 a is arranged so that the back surface of the second cutting blade 42 a faces rearward and the upper end of the second blade member 34 a protrudes slightly upward from the sheet guide surface 7. The first cutting blade 41a has its back surface opposed to the back surface of the second cutting blade 42a, and the cutting edge of the second cutting blade is slightly in front of the apex of the second cutting blade 42a (on the right side in the figure). Arranged so as to intersect. Since the second blade member 34a is biased outward by the spring built in the screw hole of the second holder member 36 as described above, the first cutting blade 41a and the second cutting blade 42a They are in pressure contact with each other at the intersection P1. At the intersection P1, the angle α defined between the first and second cutting blades is an acute angle.

  Furthermore, the lower end of the first cutting blade 41a is disposed slightly below the cutting edge of the second cutting blade so as to reduce the area overlapping the back surface of the second cutting blade 42a, and the first cutting blade 41a below the first cutting blade 41a. The side of the blade member 33 is cut out round along the periphery of the second blade member 34a. This prevents paper dust and waste generated when the sheet is cut from accumulating between the first and second cutting blades 41a and 42a.

  The sheet S on the sheet guide surface 7 is cut by moving the cutter unit 31 in the cutting direction, that is, on the right side in FIG. FIGS. 11A and 11B show a state where a single sheet or a small number of sheets S are cut. The sheet S is pressed onto the sheet guide surface 7 by the elastic sheet material 20, and is held horizontally until the position immediately before the second cutting blade 42a. When the cutter unit 31 travels in the cutting direction in this state, the sheet S is pressed against the cutting edge of the second cutting blade 42a by the pressing force of the elastic sheet material 20, and is frictionally cut at the intersection P0 or slightly above the intersection P0. Cut.

  12A and 12B show a state in which a large number of sheets are cut. When the cutter unit 31 travels in the cutting direction, the lower surface of the sheet S on the sheet guide surface 7 comes into contact with the upper end protruding portion of the second cutting blade 42 a and is lifted against the pressing force of the elastic sheet material 20. As a result, as shown in the drawing, the sheet S is curved upward and small in the vicinity of the position in contact with the second cutting blade 42a while elastically deforming the elastic sheet material 20 upward. At this time, the elastic force generated by the elastic deformation of the elastic sheet material 20 acts on the sheet S so as to be pressed downward against the cutting edge of the second cutting blade 42a. On the other hand, the upper surface of the sheet S comes into contact with the first cutting blade 41a and is pressed downward.

  In this embodiment, as shown in FIGS. 6 and 7, the separation portion Sb before the sheet S is cut is formed by the sheet lifting arms 46 a and 46 b provided on the second holder member 36 of the cutter unit 31. A certain distance from the rear end to the rear is maintained at substantially the same height as the sheet guide surface. As a result, the sheet S is maintained substantially horizontal so as to intersect the first cutting blade 41a and the second cutting blade 42a substantially at right angles at least in the range between the intersection point P0 and the intersection point P1 in FIG. Is done. Therefore, the sheet S is smoothly cut along the planned cutting line smoothly without causing paper jam or the like by the friction cutting with the first cutting blade 41a from the upper surface side and the friction cutting with the second cutting blade 42a from the lower surface side. Is done.

  On the other hand, in the conventional cutter unit that does not include the sheet lifting arms 46a and 46b according to the present embodiment, the length that the separation portion Sb before cutting the sheet S extends backward from the sheet guide surface 7 becomes longer. , Droops greatly backward due to its own weight. Therefore, the sheet S obliquely intersects the first cutting blade 41a and the second cutting blade 42a in the range between the intersection point P0 and the intersection point P1 in FIG. As a result, the sheet S slips or gets caught between the cutting edges of the first and / or second cutting blades 41a and 42a, and can not be cut due to a paper jam, or cannot be cut along the planned cutting line. There is a fear.

  As shown in FIG. 12A, the separation portion Ss of the sheet S just cut in the present embodiment is guided to the rear side along the surface of the first cutting blade 41a. In general, the first cutting blade 41 a has a blade surface angle of the inner margin 50 smaller than the angle of the blade edge 49, that is, the blade edge angle, so that the separation portion Ss of the sheet S is obliquely upward along the inclination of the margin 50. Extend. Therefore, as the sheet S is cut, if the leading end of the separation portion Ss is caught on the surface or corner of the cutter unit 31 to cause bending or bending, the smooth cutting of the sheet S or the traveling of the cutter unit 31 is hindered. There is a fear.

  According to this embodiment, such a problem is solved as follows. FIG. 13A shows a state immediately after the sheet S starts to be cut by the cutter unit 31 from one end. As shown in the figure, the sheet portion Ss cut immediately after starting to be cut is pressed downward by the side 48a of the sheet pressing portion 48 at a portion close to the cutting line. When the cutting of the sheet S is further advanced, the rear part far from the cutting line is pushed downward by the inclined lower surface of the sheet lifting arm 46b on the rear side in the traveling direction, as shown in FIG. 13B. When the cutting of the sheet S proceeds to some extent, the separation portion Ss hangs downward from the sheet pressing portion 48 and the sheet lifting arm 46b by its own weight.

  FIGS. 14A to 14C sequentially show states from immediately before the other end of the sheet S is completely cut by the cutter unit 31 until it is completely cut. As shown in FIGS. 14A and 14B, the side edge portion Se of the sheet S is flush with the sheet guide surface 7 by the swing finger 23a of the sheet edge holding portion 21a until it is completely cut. Is held horizontally.

  As described above, the sheet support claw 25a and the sheet pressing claw 26a at the tip of the swing finger 23a are provided longer than the height of the gap 27 defined between them. Therefore, as shown in FIG. 14 (a), even if the uncut portion Sr of the sheet S has a slightly shorter length than the sheet pressing claw 26a, the edge thereof is the inner surface and / or the upper corner of the gap 27. Is held in the gap 27 against the weight of the cut portion Ss of the cut sheet S.

  Accordingly, the sheet S can be cut well along the cutting line without causing uncut portions or tearing to the side edge portion on the side where cutting is completed. After the cutting of the sheet S, as shown in FIG. 14C, the upper surface of the swing finger 23a abuts on the side 48a of the sheet pressing portion 48 of the cutter unit 31, and swings downward. Thereby, in order to cut | disconnect the next sheet | seat, the cutter unit 31 can be made to run over the full length of the guide lot 11 in the reverse direction.

  As mentioned above, although this invention was demonstrated in relation to preferred embodiment, this invention is not limited to the said embodiment, In the technical scope, it can implement by adding various change or deformation | transformation. Needless to say. For example, the sheet cutter 1 of the above embodiment is a so-called desktop type that manually moves the cutter unit 31 and cuts the sheet, but is built in an image forming apparatus or a printer, and automatically cuts the sheet by a motor drive or the like. The same applies to the sheet cutter.

DESCRIPTION OF SYMBOLS 1 Sheet cutter 2 Mounting base 3a, 3b Side frame part 4a, 4b Support frame part 6 Sheet guide plate 7 Sheet guide surface 8 Cutter guide mechanism 9 Sheet press mechanism 11 Guide rod 12 Guide rail 13 Press plate 14 Operation lever 21a, 21b Sheet Edge holding portions 22a, 22b Mounting stays 23a, 23b Swing fingers 25a, 25b Sheet support claws 26a, 26b Sheet pressing claws 27 Clearance 31 Cutter unit 32 Holder member 33 First blade member 34 Second blade member 35 First holder member 36 Second holder member 38 Guide hole 39 Operation knob 40 Guide grooves 41a and 41b First cutting blades 42a and 42b Second cutting blades 46a and 46b Sheet lifting arms 47a and 47b Tip portion 48 Sheet pressing portions 48a and 48b Sides

Claims (6)

A sheet placement surface for placing one or more sheets to be cut;
In order to cut the sheet on the sheet placement surface along a predetermined cutting position, a holder member that travels along the cutting position and a holder member that is attached to the holder member, and the blade edges cross each other at an acute angle. A cutter unit having at least one pair of first and second cutting blades disposed above and below ,
The holder member, in front of the first and second cutting blade of said at least one pair as viewed in the direction of travel, have a seat lifting portion extending from the cutting position on the opposite side of the sheet stacking surface,
The sheet cutter includes a sheet cutter having an upper surface that extends horizontally from the base end to the opposite side and a distal end portion that is bent obliquely upward from the upper surface to the opposite side . The holder member reciprocates along the cutting position, the cutter unit has two pairs of the first and second cutting blades, and the pair of first and second cutting blades travel in one direction. When the other pairs of the first and second cutting blades travel in the other direction, the sheet is cut, respectively, and each pair of the first and second cutting blades is viewed in the traveling direction, respectively. The sheet cutter according to claim 1 , wherein each one of the sheet lifting portions is disposed in front of the sheet cutter. The sheet cutter according to claim 1 or 2, wherein the sheet lifting portion on the rear side when viewed in the traveling direction has a lower surface inclined downward from the front to the rear in the traveling direction. The holder member, behind the first and second cutting blades of said pair or each pair when viewed in the running direction, depressing the disconnect portion of the cut already the sheet downward by the first and second cutting blades further comprising a seat depressed portion, the sheet cutter according to any one of claims 1 to 3. Ri Do from flat blade, wherein the first cutting blade is disposed on the upper side, the second cutting blade Ri Do a round blade which is disposed on the lower side, and the first cutting blade and the second cutting blade, they crossed at an acute angle to each other a cutting edge of the placement as pressed by the intersection, the sheet cutter according to any one of claims 1 to 4. A pressing member for pressing the sheet to the sheet stacking surface,
An elastic sheet material extending from the pressing member to the front of the cutting position ;
The cutting edge of the sheet extending from the sheet mounting surface to the opposite side beyond the cutting position , in front of the intersection with the cutting edge of the first cutting blade, in front of the intersection. as can lift the cut portion, projecting upwardly from said sheet stacking surface,
Before SL elastic sheet member, wherein when pressing the sheet to the sheet stacking surface by the pressing member, and upward elastic deformation from the sheet stacking surface between the front of the cutting position and said pressing member, The sheet cutter according to claim 5, wherein the sheet is pressed against the sheet placement surface .

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