JP2008238387A - Sheet cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a sheet cutting device of a low cost and a long service life capable of full width cutting and partial cutting by changing a movable blade between large and small turning angles without sliding the movable blade. <P>SOLUTION: In the sheet cutting device 1, a pin 12 for turning the movable blade 3 about a support shaft 5 is inserted in an elongate hole 11 formed in the movable blade 3 and is further inserted in a pin cam groove 22 formed in a circular end surface of a rotor 14. The pin 12 is rotatable about a rotation center shaft 13 and is slidable in direction to and from the rotation center axis. When the rotor 14 rotates in a first rotation direction A1, the pin 12 approaches to the rotation center shaft 13 and traces a rotational locus C1 of a first rotation radius R1. When the rotor 14 rotates in a second rotation direction A2, the pin 12 separates from the rotation center shaft 13 and traces a rotational locus C2 of a second rotation radius R2. The movable blade 3 is changed between large and small turning ranges and is changeable for the full width cutting or for the partial cutting only by changing the rotation direction of the rotor 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a scissor-type sheet cutting apparatus that moves a movable blade from a standby position away from a fixed blade to a cutting position that overlaps the fixed blade, thereby cutting a sheet that is passed between them. More specifically, the present invention relates to a sheet cutting apparatus that can perform full-width cutting that completely cuts a sheet and partial cutting that leaves part of the sheet by switching the amount of movement of a movable blade.

  A roll paper printer or the like is equipped with a sheet cutting device for cutting the roll paper after printing. As the sheet cutting device, a movable type that rotates the movable blade relative to the fixed blade to cut the sheet while intersecting both blade edges from the root side to the tip side, and movable relative to the fixed blade A method of cutting a sheet by moving a blade in a linear direction is known. In any type of sheet cutting apparatus, it is possible to perform both full width cutting (full cutting) for completely cutting the sheet and partial cutting (partial cutting) for cutting with a part of the sheet left uncut. Things are known.

  Patent Document 1 discloses a vertical auto-cutter device that can perform full-width cutting and partial cutting. In the auto cutter device disclosed herein, the movable blade is supported so as to be rotatable about the rotation support shaft portion, and a long hole formed in the movable blade, a pin slidably inserted into the long hole, and a pin A crank mechanism for rotating the movable blade is constituted by the rotor that rotates the rotor. In addition, the movable blade is slidably attached to the rotation support shaft, and when the pin rotates in one direction by the rotor, the sheet is partially cut while leaving the end in the width direction of the sheet, When the pin is rotated in the reverse direction, the movable blade is slid by the pin to increase its effective cutting length and cut the full width of the sheet.

Patent Document 2 discloses a sheet cutting apparatus that can move a movable blade in a linear direction to cut the sheet in full width and partially. In the sheet cutting apparatus disclosed herein, a link that functions as a crank arm of a crank mechanism for moving the movable blade is slidably attached to the rotation support shaft through a long hole. By rotating a pin that is slidable along a pin hole formed in the link by a rotor, the link rotates about a rotation support shaft. An L-shaped elongated hole is formed in the link, and a drive pin that is slidably inserted into the elongated hole is attached to the movable blade. When the pin rotates in one direction by the rotor, the link slides in one direction and the drive pin fits into a narrow portion of the L-shaped elongated hole, and the link rotates in this state. As a result, the movable blade cuts the entire width of the sheet. When the pin rotates in the reverse direction, the link slides to the other side and the drive pin is positioned in the wide portion of the L-shaped elongated hole with play, and the link rotates in this state. As a result, the moving range of the movable blade is narrowed, and the sheet is partially cut and partially cut.
Japanese Patent Laid-Open No. 9-19890 JP-A-6-47696

  However, the sheet cutting apparatus that performs full-width cutting and partial cutting by sliding a movable blade that rotates or a rotation link for linearly moving the movable blade as in the prior art has the following problems. is there.

  In order to cut the sheet, it is necessary to make the movable blade surely cross slide with respect to the fixed blade. For this purpose, it is necessary to press the movable blade toward the fixed blade with a large force. The pressurization is performed by mounting a compression coil spring or the like on the rotation center axis portion of the movable blade. Therefore, in order to slide the movable blade or the link supported rotatably on the rotation center axis for switching between full width cutting and partial cutting, a large frictional force generated by the applied pressure acting on them. Must be generated, and a large rotor rotational force is required.

  The mechanism for generating a large driving force for sliding requires large and expensive parts. Further, since the sliding is performed under a large frictional force, the parts constituting the sliding part are severely worn, and the life of the sheet cutting device is shortened. In order to extend the life, expensive parts with excellent wear resistance are required.

  In view of these points, an object of the present invention is to propose a sheet cutting device capable of performing full width cutting and partial cutting without sliding a movable blade or a member for moving the movable blade. It is in.

In order to solve the above-described problem, the present invention switches the movement amount for moving the movable blade from the standby position away from the fixed blade toward the cutting position overlapping the fixed blade, thereby cutting the full width of the sheet and a part thereof. In the sheet cutting device that performs partial cutting that remains uncut,
In order to move the movable blade, a rotating member that rotates a predetermined angle range around a support shaft;
An elongated hole formed in the rotating member;
A pin that is slidably inserted into this slot,
A rotor that rotates the pin around a rotation center axis away from the support shaft and the elongated hole;
And a switching mechanism that switches a rotation radius of the pin about the rotation center axis in accordance with a rotation direction of the rotor.

Further, the switching mechanism includes a pin pedestal to which the pin is fixed and a pin cam groove into which the pin is slidable, and the pin pedestal rotates about the rotation center axis. The pin cam groove is formed in the rotor, and is located at a position farther from the rotation center axis than the first groove end. A second groove end,
When the rotor rotates in the first rotation direction, the pin draws a rotation trajectory of the first rotation radius defined by the first groove end, and the rotating member rotates the first angular range for partial cutting,
When the rotor rotates in the reverse second rotation direction, the pin draws a rotation trajectory of a second rotation radius longer than the first rotation radius defined by the second groove end, and the rotating member is for full width cutting. The second angle range is rotated.

  Here, in the case of a saddle type sheet cutting device, the movable blade may be formed on the rotating member. In other words, the movable blade may be a rotating member.

  Further, in the case of a sheet cutting apparatus that cuts a sheet by linearly moving the movable blade with respect to the fixed blade, the rotation of the rotating member is caused to approach and leave the movable blade with respect to the fixed blade. What is necessary is just to arrange | position the conversion mechanism which converts into the linear reciprocating motion of a direction.

  In the sheet cutting apparatus of the present invention, a crank mechanism is constituted by the rotating member, the long hole, the pin, and the rotor, and the rotating member rotates around a support shaft by a predetermined angle range by the rotation of the rotor.

  Further, the pin attached to the pin base is inserted into the pin cam groove so as to be slidable in the direction approaching and leaving the rotor rotation center axis. When the rotor rotates in the first rotation direction, the pin cam groove also rotates in the same direction together with the rotor. The pin inserted into the pin cam groove slides in the pin cam groove to the first groove end side as the pin cam groove rotates, and rotates with the rotor integrally with the pin cam groove after contacting the first groove end. To do. That is, the pin rotates around the rotation center axis at a position moved to the side closer to the rotation center axis, and draws a rotation locus of the first rotation radius. As a result, since the amount of movement of the movable blade is small, it is possible to perform partial cutting in which a part of the sheet is left uncut.

  When the rotor rotates in the reverse second rotational direction, the pin inserted into the pin cam groove slides in the pin cam groove toward the second groove end side as the pin cam groove rotates, and then hits the second groove end. Rotates together with the rotor together with the pin cam groove. That is, the pin rotates around the rotation center axis at a position moved away from the rotation center axis, and draws a rotation locus with a second rotation radius longer than the first rotation radius. As a result, the amount of movement of the movable blade increases, so that the sheet is cut in full width.

  In the sheet cutting apparatus of the present invention, it is not necessary to switch the effective cutting length of the movable blade or the moving range of the movable blade by sliding the component on which the pressing force for pressing the movable blade against the fixed blade is applied. This eliminates the need for a large rotor rotational force to slide the parts on which a large pressing force is applied, so sheet cutting that enables switching between full-width cutting and partial cutting with a long service life using small and inexpensive components. A device can be realized.

  Hereinafter, an embodiment of a sheet cutting apparatus to which the present invention is applied will be described with reference to the drawings.

  FIGS. 1A and 1B are a schematic configuration diagram showing a scissors-type sheet cutting device according to an embodiment of the present invention, and a partial cross-sectional view of a portion cut along a line aa. The sheet cutting device 1 according to the present embodiment includes a fixed blade 2 and a movable blade 3, and the fixed blade 2 is fixed to a device housing 4 or a member (not shown) on the side where the sheet cutting device 1 is mounted. The movable blade 3 is attached to the apparatus housing 4 in a rotatable state, and the apparatus housing is also fixed to a member (not shown) on the side where the sheet cutting apparatus 1 is mounted.

  The movable blade 3 is supported such that the end 31 on the base side is rotatable on a support shaft 5 fixed to the apparatus housing 4. The movable blade 3 can be rotated by a movable blade driving mechanism 10 mounted on the apparatus housing 4 within a predetermined angle range intersecting the fixed blade 2 from a standby position 3A away from the fixed blade 2 shown in the figure. When the movable blade 3 is rotated in a direction approaching the fixed blade 2, the root side portion of the blade edge portion 3a of the movable blade 3 riding on the root side portion of the blade edge portion 2a of the fixed blade 2 is directed toward the tip side. These crossing positions move, and a sheet (not shown) sandwiched between the blades 2 and 3 is cut. A compression coil spring (not shown) is attached to the support shaft 5 and presses the movable blade 3 toward the fixed blade 2 with a large force.

  The movable blade drive mechanism 10 includes a pin-sliding oblong hole 11 formed in a state extending along the length direction of the movable blade 3 at a substantially central portion in the length direction of the movable blade 3, and the elongated hole. A cylindrical pin 12 inserted into the elongated hole 11 so as to be slidable along the elongated hole 11, and the pin 12 is rotated about a rotation axis 13 that is separated from the support shaft 5 and the elongated hole 11. And a rotor 14. The rotor 14 is a worm wheel, and a worm gear 15 is engaged with the rotor 14. The worm gear 15 is fixed to an output shaft 16 a of a drive motor 16 mounted on the apparatus housing 4.

  Here, there is provided a switching mechanism for switching the rotation radius of the rotation locus of the pin 12 around the rotation center shaft 13 between long and short according to the rotation direction of the rotor 14. The switching mechanism includes a pin base 21 on which the pin 12 is supported and a pin cam groove 22 into which the pin 12 is inserted in a slidable state.

  The pin base 21 has a rectangular flat plate shape and is disposed between the rotor 14 and the movable blade 3. A shaft hole 21a made of a long hole is formed at one end of the pin base 21, and the rotation center shaft 13 passes through the shaft hole 21a in a rotatable and slidable state. A cylindrical pin 12 is fixed to the other end of the pin pedestal 21 so as to face in a direction orthogonal to the pin pedestal 21, that is, in a direction parallel to the rotation center axis 13.

  In this example, the pin cam groove 22 is an oval groove formed in the circular end surface 14a of the rotor 14 on the movable blade 3 side. The pin cam groove 22 extends in a direction inclined at an inclination angle of less than 90 degrees with respect to a radial line extending from the rotation center shaft 13, and the center of one semicircular first groove end 22 a, the rotation center shaft 13, (The first turning radius R1) is shorter than the distance (second turning radius R2) between the center of the other semicircular second groove end 22b and the rotation center shaft 13. The pin 12 fixed to the pin base 21 is inserted into the pin cam groove 22 so that one end thereof is slidable, and the other end is inserted into the elongated hole 11 formed in the movable blade 3. It is passed through in a slidable state.

  The operation of the sheet cutting apparatus 1 having this configuration will be described. It is assumed that the movable blade 3 is in the standby position 3A shown in FIG. In this state, when the rotor 14 is rotated in the first rotation direction indicated by the arrow A1, the pin cam groove 22 formed on the circular end surface 14a of the rotor 14 is also integrally rotated about the rotation center shaft 13 in the same direction. . As a result, the pin 12 inserted into the pin cam groove 22 is pushed in a direction approaching the rotation center shaft 13 by the inner end face 22 c outside the pin cam groove 22 as the rotor 14 rotates. Since the pin 12 is fixed to the pin base 21 that is rotatable about the rotation center shaft 13 and is slidably mounted, the pin 12 and the pin base 21 slide toward the rotation center shaft 13.

  Thus, as the rotor 14 rotates, the pin 12 moves relative to the first groove end 22a along the pin cam groove 22 and comes into contact with the first groove end 22a.

  FIG. 2 is an explanatory view showing a state in which the pin 12 is in contact with the first groove end 22 a of the pin cam groove 22. Since the pin 12 does not slide after reaching the state shown in FIG. 2, the pin 12 rotates in the direction of the arrow A1 together with the rotor 14 while being in contact with the first groove end 22a. Therefore, the pin 12 rotates along the rotation locus C1 of the first rotation radius R1 defined by the first groove end 22a. Since the pin 12 rotates along the small rotation locus C1, the rotation angle of the movable blade 3 by the pin 12 is narrow.

  When the rotor 14 is rotated in the first rotational direction indicated by the arrow A1 from the position where the pin 12 contacts the first groove end 22a of the pin cam groove 22, in the above description, the pin 12 contacts the first groove end 22a from the beginning. It rotates along the rotation locus C1 while touching.

  FIG. 3 is an explanatory view showing a state in which the rotor 14 rotates in the direction of the arrow A1 and the movable blade 3 reaches the maximum rotation position, that is, the sheet cutting end position 3B. As shown in this figure, when the movable blade 3 reaches the sheet cutting end position 3B, only the tip portion 3b of the blade tip portion 3a of the movable blade 3 intersects the tip portion 2b of the blade tip portion 2a of the fixed blade 2. Not. Therefore, partial cutting is performed in which the end of a sheet (not shown) located between the leading end portions 2b and 3b is left uncut. When the rotor 14 is further rotated in the direction of the arrow A1 from the state shown in FIG. 3, the movable blade 3 returns to the standby position shown in FIG. In this case, the pin 12 is in a position in contact with the first groove end 22 a of the pin cam groove 22.

  On the other hand, when the rotor 14 is rotated in the second rotation direction indicated by the arrow A2 from the state where the pin 12 is in contact with the first groove end 22a of the pin cam groove 22 as shown in FIG. The pin cam groove 22 is also integrally rotated about the rotation center shaft 13 in the same direction. As a result, the pin 12 inserted into the pin cam groove 22 is pushed away from the rotation center shaft 13 by the inner end face 22d inside the pin cam groove 22 as the rotor 14 rotates. Since the pin 12 is fixed to the pin base 21 that is rotatable about the rotation center shaft 13 and is slidably mounted, the pin 12 slides in a direction away from the rotation center shaft 13.

  Thus, as the rotor 14 rotates, the pin 12 moves relative to the second groove end 22b along the pin cam groove 22 and comes into contact with the second groove end 22b. Thereafter, since the pin 12 does not slide, the pin 12 rotates together with the pin base 21 in the direction of the arrow A2 together with the rotor 14 while being in contact with the second groove end 22b. Therefore, the pin 12 rotates along the rotation locus C2 of the second rotation radius R2 defined by the second groove end 22b. Since the pin 12 rotates along the large rotation locus C2, the rotation angle of the movable blade 3 by the pin 12 is wide.

  When the rotor 14 is rotated in the second rotational direction indicated by the arrow A2 from the state where the movable blade 3 is in the standby position shown in FIG. 1, that is, the position where the pin 12 contacts the second groove end 22b of the pin cam groove 22, In the description, the pin 12 rotates along the rotation locus C2 while coming into contact with the second groove end 22b from the beginning.

  FIG. 4 is an explanatory diagram showing a state in which the rotor 14 rotates in the direction indicated by the arrow A2 and the movable blade 3 reaches the maximum rotation position, that is, the sheet cutting end position 3C. As shown in this figure, in a state where the movable blade 3 has reached the sheet cutting end position 3C, the blade edge portion 3a of the movable blade 3 totally intersects with the blade edge portion 2a of the fixed blade 2 including its tip portion 3b. It becomes a state. Accordingly, a sheet (not shown) positioned between them is cut in full width. When the rotor 14 is further rotated in the direction of the arrow A2 from the state shown in FIG. 4, the movable blade 3 returns to the standby position shown in FIG.

  As described above, in the sheet cutting apparatus 1 according to the present embodiment, when the rotation direction of the rotor 14 is switched, the rotation radius of the pin 12 that rotates together with the rotor 14 is switched between longer and shorter. Therefore, the rotation angle of the movable blade 3 that is rotated by the pin 12 can be changed into wide and narrow, and the sheet can be cut in full width and partially.

  Therefore, as compared with the conventional case where the movable blade 3 is slidably attached to the support shaft 5 and the movable blade 3 is slid against a large pressing force, the sliding blade 3 is small and does not have a large sliding frictional resistance. The rotational angle range of the movable blade 3 can be switched using inexpensive components. Therefore, it is possible to realize an inexpensive sheet cutting apparatus having a long life and capable of switching between full width cutting and partial cutting.

(Other embodiments)
In the above example, the present invention is applied to a vertical sheet cutting apparatus. The present invention can be similarly applied to a sheet cutting apparatus of a type in which a movable blade is moved linearly with respect to a fixed blade and a sheet positioned between the two blades is cut. In this case, for example, as described in Patent Document 2 described above, a drive pin is attached to the movable blade 3, and a rotation that is rotated by a pin 12 whose rotation radius is switched between long and short according to the rotation direction of the rotor. An oval long hole into which the driving pin is slidably inserted is formed in the moving member, and the rotation of the rotating member may be converted into a linear motion of the movable blade. In addition, unlike the case of patent document 2, the long hole which a drive pin slides should just be a long hole of fixed width.

It is the schematic block diagram and the fragmentary sectional view of the sheet cutting device to which the present invention is applied. It is explanatory drawing for demonstrating operation | movement of a sheet cutting device. It is explanatory drawing which shows the sheet cutting device at the time of partial cutting. It is explanatory drawing which shows the sheet cutting device at the time of full width cutting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet cutting device, 2 Fixed blade, 2a Cutting edge part, 2b Tip part, 3 Movable blade, 3a Cutting edge part, 3b Tip part, 3A Standby position, 3B Sheet cutting completion position, 3C Sheet cutting completion position, 4 Apparatus housing, 5 Support shaft, 10 movable blade drive mechanism, 11 long hole, 12 pins, 13 rotation center shaft, 14 rotor, 14a circular end face, 15 worm gear, 16 drive motor, 16a output shaft, 21 pin pedestal, 21a shaft hole, 22 pin cam groove , 22a First groove end surface, 22b Second groove end surface, 22c, 22d Inner end surface, 31 end, A1 first rotation direction, A2 second rotation direction, C1 rotation locus, C2 rotation locus, R1 first rotation radius, R2 Second turning radius

Claims (4)

In the sheet cutting apparatus that switches the moving amount to move the movable blade from the standby position away from the fixed blade toward the cutting position that overlaps the fixed blade, and performs full width cutting and partial cutting that leaves part of the sheet,
In order to move the movable blade, a rotating member that rotates a predetermined angle range around a support shaft;
An elongated hole formed in the rotating member;
A pin that is slidably inserted into this slot,
A rotor that rotates the pin around a rotation center axis away from the support shaft and the elongated hole;
A sheet cutting apparatus comprising: a switching mechanism that switches a rotation radius of the pin about the rotation center axis according to a rotation direction of the rotor. In the sheet cutting device according to claim 1,
The switching mechanism includes a pin pedestal to which the pin is fixed and a pin cam groove into which the pin is slidable, and the pin pedestal is rotatable about the rotation center axis. And the pin cam groove is formed in the rotor, and is located at a first groove end and a position further away from the rotation center axis than the first groove end. With two groove ends,
When the rotor rotates in the first rotation direction, the pin draws a rotation trajectory of the first rotation radius defined by the first groove end, and the rotating member rotates the first angular range for partial cutting,
When the rotor rotates in the reverse second rotation direction, the pin draws a rotation trajectory of a second rotation radius longer than the first rotation radius defined by the second groove end, and the rotating member is for full width cutting. A sheet cutting device that rotates the second angle range. In the sheet cutting device according to claim 1 or 2,
The sheet cutting apparatus according to claim 1, wherein the movable blade is formed on the rotating member. In the sheet cutting device according to claim 1 or 2,
A sheet cutting device comprising: a conversion mechanism that converts the rotation of the rotating member into a linear reciprocating motion in a direction in which the movable blade approaches and leaves the fixed blade.

Images