JP2009006449A - Scissor type sheet cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scissor type sheet cutting device capable of maintaining the pressing force between a stationary blade and a movable blade in an appropriate range wherever their crossing sliding position lies between the root and the tip in the blade striation direction. <P>SOLUTION: The scissor type sheet cutting device 1 is configured so that the movable blade 3 is pressed to the stationary blade 2 only with the energizing force of a compression coil spring 42 of a root part energizing means during the period in which the movable blade 3 rotates and the crossing sliding position C to the stationary blade 2 shifts for a prescribed amount toward the tip. The pressing force lowers gradually when the position C separates from the rotational center. After the crossing sliding position C of the two blades 2 and 3 has moved toward the tip for the prescribed amount, the pressing force by a torsion coil spring 45 of a tip energizing means is added to the movable blade 3. Thereafter the movable blade 3 is pressed to the stationary blade 2 by the energizing force of the two energizing means, so that the pressing force of the two blades 2 and 3 is maintained at the prescribed value or above. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  According to the present invention, as the movable blade rotates, the cross sliding position of the fixed blade and the movable blade moves from the root side portion toward the tip side portion in the blade line direction, The present invention relates to a scissors-type sheet cutting device that cuts a sheet disposed on the sheet.

  In a roll paper printer or the like, a sheet cutting device for cutting a roll paper is mounted in order to issue a printed roll paper portion as a receipt having a predetermined length. As a sheet cutting device, there is known a scissor-type device that cuts a sheet while rotating a movable blade with respect to a fixed blade and moving the crossing position of both blades from the root side toward the tip side.

  Such a scissors-type sheet cutting device is disclosed in Patent Document 1. 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.

In the vertical sheet cutting apparatus, it is necessary to reliably slide the movable blade against the fixed blade in order to cut the sheet. Therefore, it is necessary to pressurize the movable blade toward the fixed blade with a large force. As disclosed in Patent Document 1, a compression coil spring is attached to a portion of the rotation center axis of the movable blade, and a state in which the movable blade is pressed against the fixed blade by the compression coil spring is formed.
Japanese Patent Laid-Open No. 9-19890

  However, the urging mechanism that presses the movable blade against the fixed blade at the position of the rotation center axis, in other words, at the base side of the movable blade, sufficiently applies the pressing force to the fixed blade at the distal end portion of the movable blade. It cannot be secured.

  If it demonstrates with reference to Fig.5 (a)-(c), sufficient pressing force can be ensured in the state which the fixed blade 102 and the movable blade 103 cross-slide in the site | part of those root sides. However, as indicated by a solid curve A in the graph of FIG. 5C, the pressing force decreases as the cross sliding position C moves to the tip side and moves away from the biasing position of the biasing mechanism 110, and the tip It becomes the smallest in the side part.

  Here, in order to ensure a sufficient pressing force even when the cross-sliding position C of the two blades 102 and 103 moves to the tip side, the spring member that urges the movable blade 103 at the position of the rotation center. It is necessary to increase the urging force F (see FIG. 5B).

  However, when the urging force F is increased, the pressing force between the two blades increases in the entire blade line direction as indicated by the broken line curve B in the graph of FIG. The pressing force when the two blades cross and slide on the base side is greatly increased. If the pressing force of both the blades becomes excessive, the wear of the cross-sliding both blades becomes intense and the durability deteriorates. Further, if the pressing force on the root side becomes excessive, the rotational load of the movable blade becomes excessive, and the movable blade may not be able to rotate and may fall into a locked state.

  An object of the present invention is to maintain the pressing force between the fixed blade and the movable blade within an appropriate range at any position between the root side and the tip side in the blade line direction of the cross sliding position thereof. It is to propose a scissors-type sheet cutting apparatus capable of performing the above.

  In order to solve the above problems, according to the present invention, as the movable blade rotates, the cross sliding position of the movable blade with respect to the fixed blade changes from the root side portion to the tip side portion in the direction of the blade line. In a saddle type sheet cutting apparatus that moves toward and cuts a sheet positioned between them, the root that urges the movable blade toward the fixed blade at the position of the root side portion of the movable blade It is characterized by having side urging means and tip side urging means for urging the movable blade toward the fixed blade at the position of the tip side portion of the movable blade.

  In the scissors-type sheet cutting device of the present invention, when the movable blade rotates and the cross sliding position with respect to the fixed blade moves toward the tip side, the movable blade is pressed against the fixed blade by the urging force of the root side urging means. It is done. This pressing force gradually decreases as the cross sliding position moves away from the rotation center. However, when the pressing force by the tip side biasing means is added to the movable blade, the movable blade is pressed against the fixed blade by the biasing force of both biasing means, so that the pressing force of both blades is maintained at a predetermined value or more. Therefore, the pressing force of both blades is maintained at a predetermined value or more over the entire blade direction of both blades, and the sheet can be cut reliably.

  Further, the tip side urging means of the present invention is configured so that the cross sliding position of the movable blade and the fixed blade moves from the root side portion toward the tip side portion by a predetermined amount from the point in time. The movable blade is biased toward the fixed blade at the position of the tip side portion.

  In the scissors-type sheet cutting device of the present invention, the movable blade is rotated only by the urging force of the base side urging means while the movable blade rotates and the cross-sliding position with respect to the fixed blade moves by a predetermined amount toward the tip side. Is pressed against the fixed blade. This pressing force gradually decreases as the cross sliding position moves away from the rotation center. However, after the cross-sliding position of the two blades moves to the tip side by a predetermined amount, the pressing force by the tip side urging means is added to the movable blade. After this, since the movable blade is pressed against the fixed blade by the urging force of both urging means, the pressing force of both the blades is maintained at a predetermined value or more. Therefore, the pressing force of both blades is maintained at a predetermined value or more over the entire blade direction of both blades, and the sheet can be cut reliably.

  Also, since the tip side biasing means is used to secure the pressing force of both blades when the cross-sliding position of both blades moves to the tip side, it is necessary to increase the biasing force of the root side biasing means. There is no. Therefore, it is possible to prevent the adverse effect that the root portion of both the blades crosses and slides with an excessive pressing force, and the wear amount of both the blades increases to deteriorate the durability. In addition, it is possible to prevent an adverse effect that a large cross-sliding resistance is generated by an excessive pressing force and the movable blade cannot be rotated and falls into a locked state.

  Here, the tip-side urging means may be of various structures. For example, the tip-side urging means is composed of a presser lever and a spring member that urges the presser lever. After the movable blade has moved by a predetermined amount from the base portion, the tip of the movable blade engages with the presser lever and rotates while being pressed against the fixed blade by the presser lever. You can do it.

  As the root side urging means, a means using a coil spring or the like that urges the movable blade at the rotation center position of the movable blade may be used as generally adopted.

  In the scissors-type sheet cutting apparatus of the present invention, the movable blade is urged against the fixed blade by the root side biasing means at the root side position, and at the tip side position, the movable blade is moved by the tip side biasing means. The blade is biased to the fixed blade.

  Therefore, the pressing force between the fixed blade and the movable blade can be maintained in an appropriate range over the entire blade line direction. In addition, the pressing force on the base side of both blades becomes excessive, and the sliding wear amount of both blades increases and the durability decreases, and the movable blade moves from the base side portion of the fixed blade toward the tip side. Thus, the adverse effect of falling into a locked state at the start of sliding can be solved.

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

  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 line AA. The vertical sheet cutting device 1 includes a fixed blade 2 and a movable blade 3. The fixed blade 2 is a device housing 4 or a member on which the vertical sheet cutting device 1 is mounted, for example, a frame ( (Not shown). The movable blade 3 is attached to the device housing 4 in a rotatable state, and the device housing 4 is also fixed to a member (not shown) on the side where the saddle type sheet cutting device 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 within a predetermined angle range in a direction approaching the fixed blade 2 from a standby position 3A away from the fixed blade 2 shown in the figure by a movable blade driving mechanism 10 mounted on the apparatus housing 4. is there.

  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.

  When the movable blade 3 is rotated in the direction in which the movable blade 3 approaches the fixed blade 2 by the movable blade driving mechanism 10, the base portion 30 a of the blade tip 30 of the movable blade 3 riding on the root portion 20 a of the blade tip 20 of the fixed blade 2. The cross-sliding position C of the two blades 2 and 3 moves from the tip toward the tip side. As a result, a sheet (not shown) sandwiched between both the blades 2 and 3 is cut from the root-side end of the both blades 2 and 3 toward the tip-side end.

  FIG. 2 is a schematic perspective view showing an urging mechanism for urging the movable blade 3 toward the fixed blade 2. Referring to FIG. 1 and FIG. 2, a root-side urging means that always presses the movable blade 3 against the fixed blade 2 is disposed at the root-side end 31 of the movable blade 3. The base side biasing means of this example includes a disk-shaped spring receiver 41 fixed to the tip of the support shaft 5 and a compression coil spring 42 mounted between the end portions 31 of the movable blade 3. The movable blade 3 is always pressed against the fixed blade 2 with a predetermined force by the spring force of the compression coil spring 42.

  Further, on the side of the distal end portion 32 of the movable blade 3, distal end side urging means for pressing the movable blade 3 against the fixed blade 2 side is also arranged. The front end side urging means of this example includes a presser lever 44 supported so as to be swingable about a swing center shaft 43 attached to the apparatus housing 4, and the presser lever 44 about the swing center shaft 43. And a torsion coil spring 45 biased on one side. When the movable blade 3 is rotated by a predetermined amount from the standby position 3A shown in FIG. 1 toward the fixed blade 2, the distal end portion 32 of the movable blade 3 is engaged with the presser lever 44. Thereafter, the movable blade 3 is fixed by the presser lever 44. It rotates while being pressed against the blade 2 side.

  That is, the presser lever 44 can swing about the swing center shaft 43 in the direction in which the tip end portion 44 a approaches and moves away from the movable blade 3. A distal end surface 44b having a constant width and length for pressing the movable blade is formed at a portion of the distal end portion 44a on the movable blade 3 side. An inclined guide surface 44c that is inclined in a direction away from the movable blade 3 side is continuous with the end of the tip end surface 44b on the swinging central axis 43 side.

  The tip end surface 44b and the inclined guide surface 44c of the presser lever 44 are located within the rotation range of the tip end portion 32 of the movable blade 3, as can be seen from FIG. After the movable blade 3 is rotated by a predetermined amount from the standby position 3A, the tip end portion 32 passes through the arrangement positions of the inclined guide surface 44c and the tip surface 44b.

  Further, as can be seen from FIG. 1B, the inclined guide surface 44c intersects the movement path of the distal end portion 32 of the rotating movable blade 3, and the distal end surface 44b continuous to the inclined guide surface 44c is The movable blade 3 is held so as to protrude to the position of the back surface 3b of the movable blade 3. Therefore, when the movable blade 3 is rotated by a predetermined amount, it contacts the inclined guide surface 44c. Thereafter, the presser lever 44 is rotated while being pushed away from the movable blade 3 against the spring force of the torsion coil spring 45. After passing through the inclined guide surface 44 c, the movable blade 3 is further rotated while being pressed against the tip end surface 44 b of the presser lever 44.

  FIGS. 3A and 3B are a plan view and a cross-sectional view showing a state when the movable blade 3 starts to contact the presser lever 44, and FIGS. 4A and 4B show the movable blade 3. They are the top view and sectional drawing which show the state which finished rotating to the cutting | disconnection end position. FIGS. 5D and 5E are explanatory views showing changes in the pressing force of the double blades 2 and 3 in the embodiment of the present invention. With reference to these drawings, the cutting operation of the scissors type sheet cutting apparatus 1 will be described.

  First, in the standby state, as shown in FIG. 1, the movable blade 3 is located at a standby position 3 </ b> A away from the fixed blade 2. In the standby state, the blade edge 30 of the movable blade 3 is in a state where only the root-side portion 30 a in the blade line direction rides on the root-side portion 20 a of the blade edge 20 of the fixed blade 2. In this state, the movable blade 3 is pressed against the fixed blade 2 by the spring force of the compression coil spring 42 attached to the support shaft 5. In this state, a sheet to be cut (not shown) is disposed between the blades 2 and 3.

  When the movable blade 3 is rotated toward the fixed blade 2 by the movable blade driving mechanism 10, the cross-sliding position C of the blade edge 30 of the movable blade 3 with respect to the blade edge 20 of the fixed blade 2 is changed as the movable blade 3 rotates. It moves toward the tip side in the direction of the 3 blade lines. The blades (not shown) are cut from the root-side ends of the two blades 2 and 3 when the blade edges of the two blades cross and slide while being pressed by the spring force of the compression coil spring 12 (FIG. 5 (e)). ) Time points T1 to T2).

  As shown in FIG. 3, the amount of rotation of the movable blade 3 exceeds a predetermined amount, and the cross sliding position C of the blade edges of the movable blade 3 and the fixed blade 2 is the center position of the blade edges 20, 30 in the blade line direction. When the movable blade 3 moves to a position closer to the tip side than the tip end side, the movable blade 3 comes into contact with the inclined guide surface 44c of the presser lever 44 (time point T2 in FIG. 5E). Thereafter, the movable blade 3 rotates while pushing up the presser lever 44 against the spring force of the torsion coil spring 45 (time points T2 to T3 in FIG. 5E). After passing through the inclined guide surface 44c, the distal end portion 32 of the movable blade 3 rotates while being pressed by the distal end surface 44b continuous therewith (time points T3 to T4 in FIG. 5E).

  As a result, the movable blade 3 is fixed by the compression coil spring 42 on the root side during the rotation from the time point shown in FIG. 3 when the movable blade 3 contacts the presser lever 44 to the cutting end position 3B shown in FIG. The blade 2 is pressed against the blade 2, and rotates at the tip side while being pressed against the fixed blade 2 by the torsion coil spring 45 via the presser lever 44. In other words, the movable blade 3 is pressed against the fixed blade 2 by both springs at the time when the cross sliding position C of the two blades 2 and 3 reaches the cutting end position shown in FIG. 4 from the position shown in FIG. Move with.

  Note that when the movable blade 3 is returned from the cutting end position to the standby position, the movable blade 3 is detached from the presser lever 44 in the middle thereof.

  As described above, in the scissors type sheet cutting device 1, the movable blade 3 is always pressed against the fixed blade 2 by the root side biasing means, and the movable blade 3 is rotated by a predetermined amount from the standby position to the cutting end position. In the meantime, the movable blade 3 is pressed against the fixed blade 2 by the tip side biasing means in addition to the root side biasing means.

  Therefore, the pressing force of the blades 2 and 3 is maintained at a predetermined value or more over the entire blade direction of the blades 2 and 3, and the sheet can be cut reliably. Further, since the pressing force of both the blades when the cross sliding position C of the blades 2 and 3 moves to the tip side is secured by using the tip side biasing means, the biasing force of the root side biasing means is increased. There is no need to keep it. Therefore, it is possible to prevent the adverse effect that the root portions of the two blades 2 and 3 cross slide with an excessive pressing force, and the wear amount of the two blades increases to deteriorate the durability. In addition, it is possible to prevent an adverse effect that a large cross-sliding resistance is generated by an excessive pressing force and the movable blade cannot be rotated and falls into a locked state. As a result, a scissors-type sheet cutting apparatus that is durable and excellent in cutting stress can be obtained.

  In this example, a presser lever and a torsion coil spring are used as the front end side biasing means, but other biasing means may be used. For example, it is possible to use a presser roller instead of the presser lever. Further, as the root side biasing means, it is possible to use the same means as the tip side biasing means. Further, when the urging of the tip of the movable blade 3 is weak from the beginning of cutting, such as when the paper width is wide, the movable blade 3 can always be pressed against the fixed blade 2 by the tip side urging means.

It is the schematic block diagram and the fragmentary sectional view of the scissors type sheet cutting device to which the present invention is applied. It is a schematic perspective view which shows the mechanism which urges | moves a movable blade. It is the schematic plan view and schematic sectional drawing which show the state which the movable blade contacted the presser lever. It is the schematic plan view and schematic sectional drawing which show a cutting end state. It is explanatory drawing for showing the change of the pressing force of the both blades accompanying rotation of a movable blade.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 鋏 type sheet cutting device, 2 fixed blade, 3 movable blade, 3A standby position, 3B cutting end position, 4 device housing, 5 spindle, 10 movable blade drive mechanism, 11 oblong hole, 12 pin, 13 rotation center axis, 14 rotor, 15 worm gear, 16 drive motor, 16a output shaft, 20 cutting edge, 20a root side part, 20b tip side part, 30 blade edge, 30a root side part, 30b tip side part, 31 root end part , 32 Tip portion, 41 Spring receiver, 42 Compression coil spring, 43 Oscillation center shaft, 44 Presser lever, 44a Tip portion, 44b Tip surface, 44c Inclined guide surface, 45 Torsion coil spring, C Cross sliding position

Claims (4)

As the movable blade rotates, the cross-sliding position of the movable blade with respect to the fixed blade moves from the root-side portion to the tip-side portion in the blade line direction, and is positioned between them. In a vertical sheet cutting device that cuts a sheet that is cut,
Root-side biasing means for biasing the movable blade toward the fixed blade at the position of the base-side portion of the movable blade;
A scissors-type sheet cutting apparatus comprising tip end side biasing means for biasing the movable blade toward the fixed blade at the position of the tip side portion of the movable blade. In the scissors type sheet cutting device according to claim 1,
The tip-side urging means is configured so that the position of the tip-side portion of the movable blade from the time point when the cross-sliding position of the movable blade and the fixed blade moves by a predetermined amount from the root side portion toward the tip-side portion. The scissors-type sheet cutting device according to claim 1, wherein the movable blade is biased toward the fixed blade. In the scissors type sheet cutting device according to claim 1 or 2,
The tip side biasing means includes a presser lever and a spring member that biases the presser lever,
After the cross-sliding position has moved a predetermined amount from the base side portion, the movable blade rotates while the tip side portion engages with the presser lever and is pressed against the fixed blade by the presser lever. A scissors-type sheet cutting device. In the scissors type sheet cutting device according to any one of claims 1 to 3,
The saddle type sheet cutting device characterized in that the root side urging means urges the movable blade at a rotation center position of the movable blade.

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