JP5003300B2 - Paper cutting device - Google Patents

Description

  The present invention relates to a paper cutting device for cutting a large number of stacked sheets.

  There are various types of paper cutting devices, but a cutting device used in combination with an image forming apparatus such as a copying machine, a printer, or a facsimile machine is required to be small and can be driven with low power. For this reason, a cutting device using a rotary cutter is used (for example, Patent Document 1).

  However, a cutting apparatus for a high-speed image forming apparatus such as an electrophotographic image forming apparatus is required to have a performance capable of cutting a large number of sheets of paper at a time. Therefore, the cutting apparatus is small and has low power and high cutting ability. Required.

  In Patent Document 2, in a paper cutting device that cuts a paper by moving a cutter having a linear blade obliquely on the surface of the paper to be cut, the rotation of the motor is converted into a linear motion of the cutter using a crank and a link mechanism. A drive mechanism has been proposed.

Patent Document 3 proposes a drive mechanism that uses a screw shaft to convert the rotation of a motor into a linear motion of a cutter.
JP-A-7-247872 Japanese Utility Model Publication No. 58-13996 JP 2003-191196 A

  The paper cutting device that cuts the paper by moving the cutter in an oblique direction with respect to the paper surface has a high cutting ability to cut a large number of papers while being small in size and capable of driving with low power. It is excellent as a paper cutting device for an image forming apparatus.

  However, Patent Documents 2 and 3 have the following problems.

  In Patent Document 2, when the stroke of the cutter is lengthened in order to increase the cutting ability, the apparatus becomes large. Further, since the driving force changes depending on the angle of the crank lever, the cutter driving force changes during the cutter movement stroke, and the cutting force does not become constant.

  In Patent Document 3, since the friction loss of the drive mechanism is large and the drive efficiency is low, a motor with a large output is required as the drive means.

  If a ball screw is used as the screw, the driving efficiency is improved, but the cost is increased because the ball screw is expensive.

  Patent Document 1 discloses a drive mechanism using a wire. However, the drive mechanism disclosed in Patent Document 1 is used in a cutting device that cuts a small number of sheets, such as a rotary cutter. It cannot be used for a cutting apparatus that cuts the sheet.

  The present invention solves the above-mentioned problems in the conventional paper cutting device used in combination with a high-speed image forming apparatus, and can be driven by a small and small output motor. An object of the present invention is to provide a paper cutting device having a high cutting ability capable of cutting.

The object is achieved by the following invention.
1.
A paper having a table on which the paper is placed, a pressing member for pressing the paper on the table, a cutter that moves in an oblique direction with respect to the paper surface of the paper on the table, and a driving unit that drives the cutter In the cutting device,
The drive means includes a motor, a wire that transmits rotation of the motor to the cutter, a static pulley and a movable pulley on which the wire is hung, and the wire, the static pulley, and the movable pulley constitute a speed reduction mechanism. ,
After cutting, it has return means for returning the cutter to the retracted position,
The cutter is moved in the oblique direction by winding the wire with a positive rotation drive of the motor, and cutting is performed.
A paper cutting device , wherein the cutter is returned to the retracted position by the return means, and the wire is fed out by reverse rotation driving of the motor when the cutter is returned to the retracted position .
2 .
2. The paper cutting device according to 1 above, wherein the return means comprises a spring.
3 .
3. The paper cutting device according to 1 or 2 above, wherein the paper cutting device includes a plurality of the static pulleys and the moving pulleys.
4 .
4. The paper cutting device according to any one of claims 1 to 3 , further comprising braking means for braking rotation of the motor.

  In the present invention, since the rotation of the motor is transmitted to the cutter by a speed reduction mechanism using a wire, it is possible to use a small output motor by high-efficiency power transmission with extremely small friction loss, and a small paper cutting device Is realized.

  Hereinafter, the present invention will be described using embodiments, but the present invention is not limited to the embodiments.

  1 and 2 are sectional views of a paper cutting apparatus according to an embodiment of the present invention. FIG. 1 shows a state at the start of cutting, and FIG. 2 shows a state at the end of cutting.

  The paper S is placed on the table 1, pressed by the paper holding member 2, and held at a high pressure so that the paper bundle does not collapse at the time of cutting.

  The paper S is cut by the cutter 4.

  The cutter 4 has a linear cutting edge parallel to the paper surface of the paper S to be cut, and cuts the paper by performing an oblique movement with respect to the paper surface.

  Such a cutter is called a slide cutter.

  Since the slide cutter 4 can cut a large number of papers as compared with a rotary cutter, and cuts with a small pressure compared to a guillotine cutter that cuts with a motion perpendicular to the paper surface, This has the advantage that a relatively large number of sheets can be cut with small energy.

  In the following description, the slide cutter is simply referred to as a cutter.

  The cutter 4 is fixed to the cutter support plate 3.

  A motor 10 drives the cutter 4, and the rotation of the motor 10 is transmitted to the wire pulley 12 through the gear 11.

  One end of a wire 16 is fixed to the wire pulley 12 and wound many times.

  The wire 16 is hung on the static pulley unit 14 and the movable pulley unit 15, and the other end is fixed to the static pulley unit 14.

  The movable pulley unit 15 is connected to the cutter support plate 3 by a connecting lever 17.

  The cutter support plate 3 is provided with two inclined long holes on the left and right sides, and guide pins 20 fixed to a frame (not shown) of the paper cutting device are fitted into the long holes 18.

  The cutter support plate 3 is urged to the right in the drawing by a tension spring 19 as a return means.

  FIG. 3 shows a speed reduction mechanism composed of a wire 16, a static pulley unit 14, and a moving pulley unit 15.

  The static pulley unit 14 has six static pulleys 141 to 146, and the dynamic pulley unit 15 has five dynamic pulleys 151 to 155.

  The static pulleys 141 to 146 are rotatably supported by the shaft 14A independently of each other, and the movable pulleys 151 to 155 are rotatably supported by the shaft 15A independently of each other.

  When one end of the wire 16 is pulled by the motor 10 (see FIGS. 1 and 2), the wire 16 moves as indicated by an arrow A, but the movable pulley unit 14 moves as indicated by an arrow B by the movement of the wire 16.

  In the movement of the wire 16, the moving amount is halved in each of the movable pulley units 151 to 155.

  By this deceleration, the moving speed of the shaft 15A is decelerated corresponding to the number of the movable pulleys 151 to 155 with respect to the moving speed of the wire 16 in the wire pulley 12.

  The cutter support plate 3 is connected to the shaft 15A by the connecting lever 17, and the cutter support plate 15A is driven by the motor 10 at a speed reduced by the speed reduction mechanism shown in FIG. Then, the cutter 4 cuts the paper S.

  Since the driving force of the motor 10 is amplified in inverse proportion to the reduction gear ratio, even the motor 10 having a small output can be sufficiently used.

  Moreover, in the speed reduction mechanism using the wire, the friction loss in the drive system is extremely small, so that the power transmission efficiency is high, and a large cutter driving force can be obtained with a small output motor.

  When the wire speed reduction mechanism is used, it is possible to use a motor with a half output as compared with the case where a screw screw is used.

  The return from the state of FIG. 2 to the state of FIG. 1 is performed by reverse rotation driving of the spring 19 and the motor 10.

  That is, the motor 10 is reversely rotated by switching the drive signal to feed the wire 16, and the upper end of the wire 16 in FIG. 3 is moved to the left. Then, the spring 19, the cutter 4, the support plate 3, and the connecting lever 17 are moved to the lower right from the state of FIG. 2, and the movable pulley unit 15 is also moved to the right from the position of FIG. To return to the state of FIG.

  Thus, in the mechanism for returning the cutter 4 by the reverse rotation drive of the motor 10 and the spring 19, it is sufficient for the spring 19 to have a force that eliminates the slack of the wire 16 and always maintains the wire 16 in a tension state. .

  When the configuration in which the spring 19 is restored only by the restoring force of FIG. 1 is used, the motor 10 is reversed by the force of the spring 19 and a spring having a large tensile force is used. .

  In that case, a large force is required to move the cutter against the force of the spring from FIG. 1 to FIG. 2, and a motor with a large output is required, but the cutter drive mechanism shown in FIGS. In addition, it becomes possible to drive the cutter 4 with a motor having a smaller output.

  Note that a torque limiter 13 incorporating a one-way clutch is connected to the motor 10 so that braking is not applied during normal rotation of the motor for cutting, but is applied only during reverse rotation for moving the cutter 4 to the retracted position.

  By the braking of the torque limiter 13, the motor 10 stops at a predetermined position without overrun when returning from FIG. 2 to FIG.

  The pressing member 2 that holds the paper S is retracted upward at the stage of placing the paper S on the table 2, and moves down to press the paper S at the time of cutting and retracts upward at the end of cutting. .

  Such operation of the pressing member 2 is performed by the motor 30.

  The rotation of the motor 30 is transmitted through the gear 31, the belt 32A, and the gear 33A, and rotationally drives the screw screw 34A.

  The rotation of the motor 30 is transmitted through the gear 31, the belt 32B, and the gear 33B, and rotationally drives the screw screw 34B.

  The holding member 2 has a female screw coupled to the screw screws 34A and 34B, and moves up and down by the rotation of the screw screws 34A and 34B.

  The paper S is placed on the table 1 with the pressing member 2 in the retracted position.

  Next, the pressing member 2 descends and presses the paper S to be in the state shown in FIG.

  Next, the motor 10 becomes a positive point, the wire 16 is wound up by the wire pulley 12, the moving pulley unit 15 moves to the left, and the cutter 4 rises to the upper left to cut the paper S.

  After the cutting is completed, the motor 10 reverses.

  With the reverse rotation of the motor 10 and the restoring force of the spring 19, the cutter 4 moves to the lower right, the wire 16 is fed out from the wire pulley 12, and the movable pulley unit 15 moves to the right. Return.

  Further, the pressing member 2 is raised and the paper S can be taken out from the table 2.

It is sectional drawing of the paper cutting apparatus which concerns on embodiment of this invention. It is sectional drawing of the paper cutting apparatus which concerns on embodiment of this invention. It is a figure which shows a deceleration mechanism.

Explanation of symbols

1 unit 2 holding member 3 support plate 4 cutter 10 and 30 motor 13 torque limiter 14 static pulley unit 15 dynamic pulley unit 16 wire 19 spring 141 to 146 static pulley 151 to 155 dynamic pulley

Claims (4)

A paper having a table on which the paper is placed, a pressing member for pressing the paper on the table, a cutter that moves in an oblique direction with respect to the paper surface of the paper on the table, and a driving unit that drives the cutter In the cutting device,
The drive means includes a motor, a wire that transmits rotation of the motor to the cutter, a static pulley and a movable pulley on which the wire is hung, and the wire, the static pulley, and the movable pulley constitute a speed reduction mechanism. ,
After cutting, it has return means for returning the cutter to the retracted position,
The cutter is moved in the oblique direction by winding the wire with a positive rotation drive of the motor, and cutting is performed.
A paper cutting device , wherein the cutter is returned to the retracted position by the return means, and the wire is fed out by reverse rotation driving of the motor when the cutter is returned to the retracted position . The paper cutting device according to claim 1 , wherein the return means is a spring. The paper cutting device according to claim 1 or 2 , wherein a plurality of the static pulleys and the movable pulleys are provided. The paper cutting device according to any one of claims 1 to 3 , further comprising a braking unit that brakes rotation of the motor.

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