JP2015058527A - Cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a mechanism of reciprocating a cutting edge to reduce vibration and noise.SOLUTION: In a sheet cutter, a reciprocation mechanism 6 for a cutting edge 5 comprises a movable iron core 21 reciprocating the cutter edge 5, a stator core 22 arranged on the outer side of the movable iron core 21 in a non-contact state, a connection implement 23 which arranges the movable iron core 21 reciprocatively in the stator core 22, a field coil 26 which switches alternately the maximum magnetic field position of the stator core 22 to move the movable iron core 21 to an upper dead point and a lower dead point and a power supply circuit 24 which switches the maximum magnetic field position between the upper and lower dead points. The power supply circuit 24 switches the maximum magnetic field position to reciprocate the movable iron core 21 between the upper and lower dead points so as to reciprocate the cutting edge 5.

Description

  The present invention relates to a cutting machine that cuts a sheet by reciprocating a cutting blade, and more particularly to a cutting machine that can cut a sheet accurately with low vibration and low noise while reciprocating a cutting blade.

  The cutting machine moves the cutting head provided with the cutting blade in the X-axis direction and the Y-axis direction on the surface of the cutting table while reciprocating the cutting blade to cut the sheet of the cutting table into a predetermined shape. To do. In this cutting machine, it is important to increase the speed at which the cutting blade is reciprocated. This is because the sheet can be efficiently and beautifully cut by moving the cutting head quickly by moving the cutting blade back and forth quickly.

  The cutting blade is connected to a reciprocating mechanism and reciprocated. An electromagnetic solenoid that reciprocates a plunger has been developed as a reciprocating mechanism. The electromagnetic solenoid energizes the field coil to attract the plunger with a magnetic attractive force, stops energization of the field coil, and returns the plunger with a spring or the like to reciprocate. In the electromagnetic solenoid having this structure, the driving force decreases when the stroke of the plunger to be reciprocated is increased. This is because the force with which the magnetic field of the stator core attracts the plunger decreases as the plunger moves away from the stator core. Also, since the plunger is returned by the elastic body, if the elastic modulus of the elastic body is increased to shorten the return time, the current of the field coil is increased to attract the plunger against the elastic body. Therefore, it is necessary to attract the plunger more strongly with the magnetic field of the stator core. However, since the attractive force of the stator core does not increase in proportion to the current of the field coil, it is difficult to shorten the return time of the plunger by the elastic body. For this reason, it is difficult to reciprocate the plunger at a high speed. That is, there is a drawback that the plunger cannot be driven by the field coil. In addition, since the driving force of the plunger cannot be controlled linearly in proportion to the current of the field coil, there is a drawback that it is difficult to control the driving force for reciprocating the cutting blade.

  In order to eliminate the above disadvantages, as a mechanism for reciprocating the cutting blade, the crankshaft is rotated by a motor, a connecting rod is connected to the crankpin of this crankshaft, and the rotational motion is converted into reciprocating motion, thereby cutting. A mechanism for reciprocating the blade is used. In this structure, since the cutting blade reciprocates once by one rotation of the crankshaft, the revolving motion speed of the cutting blade can be increased by increasing the rotation speed of the crankshaft. However, this structure has a drawback that vibration and noise increase when the rotation speed of the crankshaft is increased. In order to eliminate this defect, reciprocating mechanisms having various structures have been developed. (See Patent Document 1)

WO2004 / 057213

As shown in FIG. 1, the above-described reciprocating mechanism rotates a pair of crankshafts 1 in opposite directions at the same speed, thereby canceling out unbalanced crankshaft vibrations to reduce noise. The reciprocating mechanism of FIG. 1 can eliminate the left and right imbalance by rotating the pair of crankshafts 1 in opposite directions. However, this structure has a drawback that the vertical vibration cannot be completely canceled, and the vertical vibration and noise increase. In particular, since the two crankshafts 1 are rotated and the two connecting rods 2 reciprocate up and down, vibrations in the vertical direction cannot be eliminated. The vibration in the vertical direction causes errors in the cutting line of the sheet, so that the sheet cannot be cut with an accurate line, and the fatigue and damage of the reciprocating member due to the vibration is large, and the life is shortened. is there.
Furthermore, the reciprocating mechanism of the crankshaft also has a drawback that the reciprocating stroke cannot be controlled because the length of the crank arm specifies the reciprocating stroke.

The present invention has been developed for the purpose of solving this drawback. An important object of the present invention is that the mechanism for reciprocating the cutting blade has a very simple structure in addition to being able to completely eliminate the vibration in the left-right direction, and reducing the mass of the reciprocating parts to reduce vibration. It is to provide a cutting machine that can cut the sheet cleanly with an accurate cutting line while reducing noise.
Another important object of the present invention is to provide a cutting machine capable of adjusting both the speed at which the cutting blade reciprocates and the driving force to optimum values.
Furthermore, another important object of the present invention is to provide a cutting machine capable of controlling a stroke for reciprocating a cutting blade if necessary.

Means and effects for solving the problems

  The cutting machine of the present invention cuts a sheet 4 set on the cutting table 3 with a cutting blade 5 that reciprocates in the crossing direction of the sheet 4. The cutting machine includes a reciprocating mechanism 6 that reciprocates the cutting blade 5 and a moving mechanism 7 that moves the reciprocating mechanism 6 to a predetermined position along the surface of the cutting table 3. The reciprocating mechanism 6 includes a movable iron core 21 connected to the cutting blade 5 to reciprocate the cutting blade 5, a stator core 22 arranged in a non-contact state outside the movable iron core 21, and the stator core. The movable core 21 is connected to the connector 22, and the connecting member 23 arranged so as to be able to reciprocate in a non-contact state with the stator core 22 between the top dead center and the bottom dead center, and the stator core 22. A field coil 26 that excites and switches the maximum magnetic field position alternately between the top dead center and the bottom dead center of the movable iron core 21 to move the movable iron core 21 between the top dead center and the bottom dead center, and this field magnet. A power supply circuit 24 that controls energization of the coil 26 and switches the maximum magnetic field position of the stator core 22 between a top dead center and a bottom dead center at a predetermined cycle is provided. In the above cutting machine, the power supply circuit 24 energizes the field coil 26 to switch the maximum magnetic field position of the stator core 22 between the top dead center and the bottom dead center, and the movable iron core 21 is placed at the top dead center and the bottom dead center. The reciprocating movable iron core 21 causes the cutting blade 5 to reciprocate.

  The above cutting machine can completely eliminate the vibration in the left-right direction, and the mechanism for reciprocating the cutting blade has a very simple structure, and the mass of the reciprocating parts is reduced, reducing vibration and noise. There are features that can be done. The reason for eliminating the vibration in the left-right direction is that the movable iron core is reciprocated linearly only in the direction in which the cutting blade is reciprocated without reciprocating in the left-right direction. The reason why the reciprocating mechanism is made very simple and the vibration and noise can be reduced by reducing the mass of the reciprocating parts to be small and light is that the movable iron core is reciprocated. The movable iron core is an iron core that can pass through the magnetic flux of the stator core, and is a simple part that does not require a coil or a permanent magnet. Since the movable iron core is moved to the maximum magnetic field position of the stator core by being attracted by a magnetic attraction force and reciprocates, it is not necessary to provide a coil or a permanent magnet. In addition, the maximum magnetic field position of the stator core is moved to the top dead center and the bottom dead center, and the movable iron core is attracted to the maximum magnetic field position and reciprocated, so the movable iron core is in both the top dead center and bottom dead center directions. Driven by magnetic attraction force. For this reason, unlike the conventional electromagnetic solenoid, there is no need to urge one side with an elastic body or the like, and the movable iron core can be driven in both directions of top dead center and bottom dead center to reciprocate at high speed. For this reason, the cutting blade can be moved back and forth at high speed, and the sheet can be quickly and neatly cut along an accurate cutting line without error. In addition, since the vibration can be reduced, there is a feature that the fatigue and damage of the reciprocating parts can be reduced and the life can be extended.

Furthermore, the above cutting machine also realizes the feature that both the speed and driving force for reciprocating the cutting blade can be adjusted to the optimum values. Because the reciprocating mechanism can linearly adjust the driving force of the movable core in proportion to the current value of the field coil, it can control the driving force of the movable core by adjusting the magnitude of the field coil current. This is because the speed at which the movable core is reciprocated can be controlled by adjusting the period for switching the maximum magnetic field position, that is, the period for switching the current direction of the field coil. For this reason, the above cutting machine adjusts both the speed for reciprocating the cutting blade and the driving force to the optimum values, and realizes the characteristic that the sheet can be cut quickly and efficiently and cleanly.
Furthermore, the above cutting machine also realizes a feature that can control the stroke of the cutting blade if necessary. This is because the above-described reciprocating mechanism of the cutting machine can control the stroke for reciprocating the movable iron core. The stroke of the movable iron core can be controlled by switching the maximum magnetic field position before the movable iron core moves to the top dead center and the bottom dead center.

  In the cutting machine of the present invention, the stator core 22 is composed of a first stator core 22A and a second stator core 22B that are arranged in the reciprocating direction of the movable iron core 21 via a magnetic shield, The field coil 26 includes a first field coil 26A that excites the first stator core 22A and a second field coil 26B that excites the second stator core 22B. 24, the first field coil 26A and the second field coil 26B are alternately energized to move the maximum magnetic field position between the top dead center and the bottom dead center, thereby reciprocating the movable iron core 21. It can also be made.

  The above cutting machine can reciprocate the movable iron core 21 by energizing the first field coil and the second field coil alternately.

  In the stator core 22 of the cutting machine of the present invention, permanent magnets having different magnetic poles at the top dead center and the bottom dead center are arranged on the surface facing the movable iron core 21, and the field coil is provided with the power supply circuit 24. It is possible to switch the energizing direction of 26 to normal and reverse and reverse the excitation direction of the stator core 22 to switch the maximum magnetic field position between the top dead center and the bottom dead center. This cutting machine can also reciprocate the movable iron core by alternately switching the direction of the current flowing through the field coil, and reciprocate the cutting blade with the movable iron core.

  The reciprocating mechanism 6 may have a structure including a pair of linear actuators 29 that reciprocate the movable iron core 21 in opposite directions. Each linear actuator 29 of the reciprocating mechanism includes a movable iron core 21, a stator core 22 that is arranged outside the movable iron core 21 in a non-contact state, and the movable iron core 21 is dead to the stator core 22. Exciting the stator 23 and the coupler 23 connected so that it can reciprocate in a non-contact state between the point and the bottom dead center, the maximum magnetic field position is set to the top dead center and the bottom dead center of the movable iron core 21. It is provided with a field coil 26 that is switched alternately to a point and moves the movable iron core 21 to a top dead center and a bottom dead center. In the above reciprocating mechanism, the cutting blade 5 is connected to the movable iron core 21 of one linear actuator 29, and the energization of the field coil 26 of each linear actuator 29 is controlled to control the maximum magnetic field of each stator core 22. And a power supply circuit 24 that switches the position between a top dead center and a bottom dead center at a predetermined cycle. In this reciprocating mechanism, the power supply circuit 24 energizes the field coils 26 of the respective linear actuators to reciprocate the movable iron cores 21 of the respective linear actuators in opposite directions.

  The above cutting machine has a feature that the pair of linear actuators are reciprocated in opposite directions, so that the vibrations caused by the reciprocal movements can be canceled out and vibration and noise can be significantly reduced.

  The cutting machine can make the movable iron core 21 by laminating silicon steel plates. Since this cutting machine uses a silicon steel plate having a high permeability for the movable iron core, the cutting force can be reciprocated effectively by increasing the driving force for reciprocating the movable iron core. This is because the magnetic resistance of the movable iron core can be reduced, the magnetic resistance of the closed loop magnetic circuit formed by energizing the field coil can be reduced, and the magnetic flux density can be increased.

It is a front view which shows the conventional reciprocating mechanism. It is a perspective view of a cutting machine. It is a block diagram of the cutting machine shown in FIG. It is the schematic of the reciprocation mechanism of the cutting machine concerning the Example of this invention. It is the schematic which shows the state which the movable iron core of the reciprocation mechanism shown in FIG. 4 moves to a top dead center. It is the schematic which shows the state which the movable iron core of the reciprocation mechanism shown in FIG. 4 moves to a bottom dead center. It is a graph which shows the electric current waveform which supplies with electricity to the field coil of the reciprocation mechanism of FIG. It is the schematic of the reciprocating mechanism concerning the other Example of this invention. It is the schematic which shows the state which the movable iron core of the reciprocation mechanism shown in FIG. 8 moves to a top dead center. It is the schematic which shows the state which the movable iron core of the reciprocation mechanism shown in FIG. 8 moves to a bottom dead center. It is a graph which shows the electric current waveform which supplies with electricity to the field coil of the reciprocation mechanism of FIG. It is the schematic of the reciprocating mechanism concerning the other Example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment shown below exemplifies a cutting machine for embodying the technical idea of the present invention, and the present invention does not specify the cutting machine as follows.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The cutting machine shown in FIG. 2 cuts a sheet set on the cutting table 3 with a cutting blade 5 that reciprocates. This cutting machine includes a cutting head that is disposed above the cutting table 3 and moves in the X-axis direction and the Y-axis direction at a position approaching the upper surface of the cutting table 3, and the cutting head. A cutting blade 5 connected so as to reciprocate in the up-down direction, that is, the sheet crossing direction, a reciprocating mechanism 6 provided on the cutting head to reciprocate the cutting blade 5, and a cutting head including the reciprocating mechanism 6 And a moving mechanism 7 for moving the sheet to a predetermined position along the surface of the cutting table 3.

  The above cutting machine moves the cutting head 8 in the X-axis direction and the Y-axis direction by the moving mechanism 7 while reciprocating the cutting blade 5, and the sheet set on the cutting table 3 has a predetermined shape. Cut to.

  The moving mechanism 7 includes an X-axis drive mechanism 9 that moves the cutting head 8 in the X-axis direction, and a Y-axis drive mechanism 10 that moves the cutting head 8 in the Y-axis direction.

  The X-axis drive mechanism 9 includes a guide bridge 11 extending in the X-axis direction, a screw rod 12 for moving the cutting head 8 along the guide bridge 11, and rotating the screw rod 12 to move the cutting head 8 in the X-axis direction. And an X-axis servomotor 13 that is moved to the position. The screw head 12 is rotated by the X-axis servo motor 13 so that the cutting head 8 moves in the X-axis direction along the guide bridge 11. Is provided to penetrate. Further, the cutting head 8 is moved in the longitudinal direction of the guide bridge 11 without rotating. In order to realize this, a guide surface 14 that slides in surface contact with each other is provided on the opposing surfaces of the guide bridge 11 and the cutting head 8.

  The Y-axis drive mechanism 10 moves the guide bridge 11 in the Y-axis direction. The guide bridge 11 has a pair of support columns 15 extending downward at both ends, and a female screw hole extending in the Y-axis direction is provided at the lower end of the support column 15. The Y-axis drive mechanism 10 includes a pair of screw rods 16 screwed into the female screw holes, and a Y-axis servomotor 17 that rotates the pair of screw rods 16 in the same direction at the same rotational speed. The pair of screw rods 16 are arranged in parallel so as to extend in the Y-axis direction, and are rotated by the Y-axis servo motor 17 to move the guide bridge 11 in the Y-axis direction.

  Further, the cutting head 8 has a rotating mechanism 18 that rotates the cutting blade 5 in a horizontal plane to rotate the cutting blade 5 in a posture parallel to the moving direction and having the tip in the transfer direction as a blade edge. The rotation mechanism 18 includes a blade rotation servomotor (not shown) that rotates the cutting blade 5 in a horizontal plane. The cutting blade 5 is fixed to the rotating shaft of the blade rotation servomotor.

  As shown in the block diagram of FIG. 3, the cutting machine includes a control circuit 19 that controls the X-axis servo motor 13, the Y-axis servo motor 17, and the blade rotation servo motor, and the cutting blade 5 that feeds the sheet to the control circuit 19. And an input device 20 for inputting a shape to be cut. The control circuit 19 controls the X-axis servo motor 13, the Y-axis servo motor 17, and the blade rotation servo motor to reciprocate the cutting blade 5 so as to cut the sheet into the shape input from the input device 20. The sheet is cut by moving the cutting blade 5 to a cutting line while rotating the cutting blade 5 at a predetermined angle. The above cutting machine moves the cutting head 8 in the X-axis direction and the Y-axis direction to cut the sheet into a predetermined shape. In the present invention, the mechanism for moving the cutting head in the horizontal plane is the above-described mechanism. Not specified. This is because the cutting machine can be any mechanism that can move the cutting head to a predetermined position in the horizontal plane.

  The cutting machine is set on the cutting table 3 by moving the cutting head 8 provided with the cutting blade 5 in the X-axis direction and the Y-axis direction on the surface of the cutting table 3 while reciprocating the cutting blade 5. Cut the cut sheet with the cutting line.

  4 to 6 and FIGS. 8 to 10 show the reciprocating mechanism 6 of the cutting blade 5. The reciprocating mechanism 6 includes a movable core 21 connected to the cutting blade 5 to reciprocate the cutting blade 5, a stator core 22 disposed in a non-contact state on both sides of the movable core 21, The coupler 23 that connects the movable core 21 to the stator core 22 and the stator core 22 are excited to alternately switch the maximum magnetic field position between the top dead center and the bottom dead center where the movable core 21 reciprocates. Thus, the field coil 26 that moves the movable iron core 21 between the top dead center and the bottom dead center and the energization of the field coil 26 are controlled so that the maximum magnetic field position of the stator core 22 is set to the top dead center of the movable iron core 21. And a power supply circuit 24 for switching between a point and a bottom dead center at a predetermined cycle.

  The movable iron core 21 is a block in which silicon steel plates having a high magnetic permeability are stacked in the horizontal direction in the figure, and a pair of guide shafts 25 extending in the reciprocating motion direction are fixed linearly at both ends thereof. The reciprocating mechanism 6 shown in the drawing reciprocates the movable iron core 21 in the vertical direction, so that the guide shaft 25 is fixed to the upper and lower end surfaces of the movable iron core 21 so as to extend in the vertical direction. The guide shaft 25 is a non-magnetic material such as plastic, and the lower end of the lower guide shaft 25 is connected to the cutting blade 5.

  The connecting tool 23 is connected to the stator core 22 in a non-contact state via the upper and lower guide shafts 25 so that the movable iron core 21 can reciprocate between the top dead center and the bottom dead center. The connecting tool 23 shown in the figure includes a guide cylinder 23A and an elastic body 23B. The guide cylinder 23A is inserted so that the guide shaft 25 can slide in the reciprocating motion direction, and the elastic body 23B passes through the stator core 22. In a non-excited state where excitation is not performed, the movable iron core 21 is disposed at the center between the top dead center and the bottom dead center as shown in FIGS. The elastic body 23B is elastically deformed to reciprocate the movable iron core 21 between the top dead center and the bottom dead center.

  The stator core 22 has a magnetic pole portion 22a that is arranged opposite to both sides of the movable iron core 21, and the movable iron core 21 is arranged between the pair of magnetic pole portions 22a. The stator core 22 is also laminated with a silicon steel plate having a small magnetic resistance. The stator core 22 reciprocates the movable iron core 21 with the magnetic flux between the opposing magnetic pole portions 22a. The stator core 22 moves the maximum magnetic field position generated between the magnetic pole portions 22a in the reciprocating motion direction of the movable iron core 21, thereby reciprocating the movable iron core 21 between the top dead center and the bottom dead center. The reciprocating mechanism 6 in FIG. 4 switches the field coil 26 to be energized to switch the maximum magnetic field position between the top dead center and the bottom dead center. The reciprocating mechanism 6 in FIG. 8 reverses the direction of the current supplied to the field coil 26 to switch the maximum magnetic field position between the top dead center and the bottom dead center.

  4 and 8 controls the energization of the field coil 26 by the power supply circuit 24 to switch the maximum magnetic field position of the stator core 22 between the top dead center and the bottom dead center. Is moved back and forth between top dead center and bottom dead center.

  The reciprocating mechanism 6 in FIG. 4 includes a first stator core 22A and a second stator core in which the stator core 22 is disposed in the reciprocating direction of the movable iron core 21 via the magnetic shield 27, that is, vertically. 22B. The field coil 26 includes a first field coil 26A that excites the first stator core 22A, and a second field coil 26B that excites the second stator core 22B.

  The magnetic shield 27 is disposed between the first stator core 22A and the second stator core 22B, and the magnetic flux of the first field coil 26A is applied to the magnetic pole portion 22a of the second stator core 22B. The leakage is limited, the magnetic flux of the second field coil 26B is restricted from leaking to the magnetic pole portion 22a of the first stator core 22A, and the maximum magnetic field position is switched between the top dead center and the bottom dead center.

  In the state where the first field coil 26A arranged on the upper side is energized and the second field coil 26B is not energized, the reciprocating mechanism of FIG. 4 has a maximum magnetic field position as shown in FIG. The position is opposite to the magnetic pole portion 22a of the first stator core 22A. In this state, the magnetic shield 27 restricts the magnetic flux of the first stator core 22A from leaking to the magnetic pole portion 22a of the second stator core 22B. In this state, the movable iron core 21 is lifted and raised to the maximum magnetic field position by a magnetic attractive force. That is, it is arranged at the top dead center. In a state in which the second field coil 26B disposed on the lower side is energized and the first field coil 26A is not energized, as shown in FIG. 6, the maximum magnetic field position is the second stator core 22B. The movable iron core 21 is lowered by the magnetic attractive force and lowered. That is, it is arranged at the bottom dead center.

  Therefore, the reciprocating mechanism 6 of FIG. 4 energizes the power supply circuit 24 so as to alternately switch between the first field coil 26A and the second field coil 26B, so that the movable iron core 21 is top dead center. And reciprocate to the bottom dead center. The cycle in which the movable core 21 is reciprocated is specified by the cycle in which the first field coil 26A and the second field coil 26B are energized.

  FIG. 7 shows a current waveform in which the power supply circuit 24 energizes the first field coil 26A and the second field coil 26B. As shown in this figure, the power supply circuit 24 energizes the first field coil 26A and the second field coil 26B alternately. The reciprocating mechanism 6 described above specifies a period for reciprocating the movable iron core 21 in a period (T) in which the first field coil 26A and the second field coil 26B are alternately energized. In the reciprocating mechanism 6, the magnetic flux density between the opposing magnetic pole portions 22a increases in proportion to the value of the current supplied to the field coil 26. This is because the movable iron core 21 is attracted with a force proportional to the magnetic flux density of the magnetic pole portion 22a and moved to the top dead center and the bottom dead center. Therefore, the reciprocating mechanism 6 can control the driving force that reciprocates the movable iron core 21, that is, the thrust, with the value of the current supplied to the field coil 26.

  In the reciprocating mechanism 6 in FIG. 8, a permanent magnet 28 is fixed to the surface of the stator core 22 facing the movable core 21. The permanent magnet 28 is disposed so that the top dead center and the bottom dead center for reciprocating the movable iron core 21 have different magnetic poles. In the figure, the upper part and the lower part are different magnetic poles. In addition, the permanent magnet 28 is disposed such that the opposing surface of the magnetic pole portion 22a of the stator core 22 is a different magnetic pole, that is, a different magnetic pole is disposed on both sides of the movable core 21. In FIG. 8, the permanent magnet 28 on the right side of the movable iron core 21 has an N pole at the top and the S pole at the bottom, and the permanent magnet 28 on the left side of the movable iron core 21 has an S pole at the top and an N pole at the bottom. The magnetic flux is radiated from the N pole toward the S pole, but not on the opposite side.

  A field coil 26 is wound around each stator core 22 arranged on the left and right of the movable iron core 21. The field coil 26 radiates magnetic flux in the direction shown in FIGS. 9 and 10 depending on the direction of the current to be applied. As shown in FIG. 9, the stator core 22 energizes the field coil 26 in a direction in which magnetic flux is radiated from the right stator core 22 toward the left stator core 22 to raise the maximum magnetic field position. Place at the dead point. The reason why the maximum magnetic field position is arranged at the top dead center in this state is that the upper permanent magnet 28 is at the upper part, and the right side of the movable iron core 21 is the N pole and the left side is the S pole. That is, the magnetic flux of the opposing permanent magnet 28 is radiated from right to left. In this state, the movable iron core 21 is lifted and raised to the maximum magnetic field position by a magnetic attraction force. That is, it is moved to the top dead center. When the current of the field coil 26 is reversed, as shown in FIG. 10, the direction of the magnetic flux is reversed, the maximum magnetic field position becomes the bottom dead center of the magnetic pole portion 22a, and the movable iron core 21 is pulled down by the magnetic attractive force. And moved to the bottom dead center. In this state, the maximum magnetic field position is moved to the bottom dead center at the lower part of the permanent magnet 28. The left side of the movable iron core 21 is the N pole and the right side is the S pole. It is because it is radiated to.

  Therefore, the reciprocating mechanism 6 shown in FIGS. 8 to 10 is switched by the power supply circuit 24 so that the direction of the current of the field coil 26 is reversed at a constant period, thereby moving the movable core 21 to the top dead center and the bottom dead center. Can reciprocate to a point. The cycle in which the movable iron core 21 is reciprocated by the cycle of switching the energizing direction of the field coil 26 is specified.

  FIG. 11 shows a current waveform when the power supply circuit 24 energizes the field coil 26. As shown in this figure, the power supply circuit 24 reverses the current supplied to the field coil 26 at a predetermined cycle (T). The period for reciprocating the movable iron core 21 is specified by the period (T) for reversing the current applied to the field coil 26. This is because the movable iron core 21 is moved between the top dead center and the bottom dead center in the direction of the current flowing through the field coil 26.

  In addition, the reciprocating mechanism 6 can control the driving force for reciprocating the movable iron core 21 with the current value supplied to the field coil 26. The magnetic flux density between the opposing magnetic pole portions 22a is increased in proportion to the current value of the field coil 26, and the movable iron core 21 is attracted by a force proportional to the magnetic flux density of the magnetic pole portion 22a. It is because it is moved to the bottom dead center. Therefore, the reciprocating mechanism 6 can control the driving force that reciprocates the movable core 21, that is, the thrust, by adjusting the value of the current supplied to the field coil 26.

  The reciprocating mechanism shown in FIGS. 8 to 10 includes a position detector 30 for detecting the moving position of the movable iron core in order to control the stroke of the movable iron core. The position detector 30 detects the vertical position of the movable iron core, controls the timing at which the power supply circuit 24 switches the direction of the current supplied to the field coil 26, and adjusts the stroke of the movable iron core. For example, the stroke of the movable iron core can be reduced by switching the direction of the current flowing through the field coil 26 in the middle of the movement of the movable iron core to the top dead center and the bottom dead center. That is, the stroke can be controlled by controlling the timing of switching the direction of the current to be supplied to the field coil by the displacement from the center of the movable core. In FIG. 11, as the cycle (T) is shortened, the stroke for reciprocating the movable iron core is reduced. Without detecting the position of the movable core, the power supply circuit can shorten the cycle (T) and control the stroke of the movable core. However, as shown in FIGS. The reciprocating mechanism that detects the power and controls the power supply circuit 24 with the position detector 30 to switch the direction of the current can be controlled so as to reciprocate up and down from the center of reciprocating movement of the movable iron core. It is also possible to control the stroke of reciprocating by shifting up and down.

  The reciprocating mechanism 6 in FIG. 12 includes a pair of linear actuators 29 that reciprocate the movable iron core 21 in opposite directions. As shown in the reciprocating motion mechanisms shown in FIGS. 4 to 6 and FIGS. 8 to 10, each linear actuator 29 is fixed to the movable iron core 21 and arranged in a non-contact state outside the movable iron core 21. Exciting the stator core 22, the coupler 23, which is connected to the stator core 22 so that the movable core 21 can reciprocate in a non-contact state between the top dead center and the bottom dead center. Then, a field coil 26 is provided which switches the maximum magnetic field position alternately between the top dead center and the bottom dead center of the movable iron core 21 and moves the movable iron core 21 to the top dead center and the bottom dead center. In the reciprocating mechanism 6, the cutting blade 5 is connected to the movable iron core 21 of one linear actuator 29. Further, a power supply circuit 24 is provided that controls the energization of the field coil 26 of each linear actuator 29 to switch the maximum magnetic field position of each stator core 22 between a top dead center and a bottom dead center at a predetermined cycle. The power supply circuit 24 energizes the field coils 26 of the respective linear actuators 29 to reciprocate the movable iron cores 21 of the respective linear actuators 29 in opposite directions to eliminate vertical vibration and noise.

  The cutting machine of the present invention is used as an apparatus for moving a cutting blade 5 that reciprocates to a predetermined cutting line to cut a sheet into a predetermined shape.

DESCRIPTION OF SYMBOLS 1 ... Crankshaft 2 ... Connecting rod 3 ... Cutting table 4 ... Sheet 5 ... Cutting blade 6 ... Reciprocating mechanism 7 ... Moving mechanism 8 ... Cutting head 9 ... X-axis drive mechanism 10 ... Y-axis drive mechanism 11 ... Guide bridge 12 ... Screw Bar (X axis direction)
13 ... X-axis servo motor 14 ... Guide surface 15 ... Post 16 ... Screw rod (Y-axis direction)
DESCRIPTION OF SYMBOLS 17 ... Y-axis servo motor 18 ... Rotation mechanism 19 ... Control circuit 20 ... Input device 21 ... Movable iron core 22 ... Stator core 22a ... Magnetic pole part 22A ... 1st stator core 22B ... 2nd stator core 23 ... Connection Tool 23A ... guide cylinder 23A 23B ... elastic body 23B
24 ... Power supply circuit 25 ... Guide shaft 26 ... Field coil
26A ... 1st field coil 26B ... 2nd field coil 27 ... Magnetic shield 28 ... Permanent magnet 29 ... Linear actuator 30 ... Position detector

Claims (5)

A cutting machine for cutting a sheet set on a cutting table (3) with a cutting blade (5) that reciprocates in the crossing direction of the sheet,
A reciprocating mechanism (6) for reciprocating the cutting blade (5), and a moving mechanism (7) for moving the reciprocating mechanism (6) to a predetermined position along the surface of the cutting table (3),
A reciprocating mechanism (6) is connected to the cutting blade (5) and reciprocatingly moves the cutting blade (5), and is arranged in a non-contact state outside the movable iron core (21). Energize the stator core (22), the coupler (23) that connects the movable core (21) to the stator core (22) so that it can reciprocate without contact, and the stator core (22) The field coil that moves the movable iron core (21) between the top dead center and the bottom dead center by alternately switching the maximum magnetic field position between the top dead center and the bottom dead center where the movable iron core (21) reciprocates. (26) and a power supply that controls the energization of the field coil (26) and switches the maximum magnetic field position of the stator core (22) between the top dead center and the bottom dead center of the movable core (21) at a predetermined cycle. Circuit (24) and
The connector (23) is arranged with the movable iron core (21) between the top dead center and the bottom dead center in the non-energized state of the field coil (26),
The power circuit (24) energizes the field coil (26), switches the maximum magnetic field position of the stator core (22) between top dead center and bottom dead center, and moves the movable iron core (21) to top dead center and bottom dead center. A cutting machine that reciprocates to the dead center and reciprocates the cutting blade (5) with a movable iron core (21) that reciprocates. A first stator core (22A) and a second stator core (22B) in which a stator core (22) is arranged in a reciprocating direction of the movable iron core (21) via a magnetic shield (27); And a field coil (26) for exciting the first stator core (22A) and a second field for exciting the second stator core (22B). A magnetic coil (26B),
2. The power supply circuit (24) according to claim 1, wherein the power supply circuit (24) reciprocates the movable iron core (21) by energizing the first field coil (26A) and the second field coil (26B) alternately. Cutting machine. The stator core (22) has a top pole and a bottom dead center with different magnetic poles on the surface facing the movable iron core (21), and the magnetic poles facing both sides of the movable iron core (21) are also different magnetic poles. Permanent magnet (28)
The power supply circuit (24) switches the energizing direction of the field coil (26) between forward and reverse, reverses the excitation direction of the stator core (22), and switches the maximum magnetic field position between top dead center and bottom dead center. The cutting machine according to claim 1. The reciprocating mechanism (6) includes a pair of linear actuators (29) for reciprocating the movable iron core (21) in opposite directions,
Each linear actuator (29) is movable to the movable iron core (21), the stator core (22) arranged in a non-contact state outside the movable iron core (21), and the stator core (22). Maximum magnetic field position by exciting the connector (23), which connects the iron core (21) so that it can reciprocate in a non-contact state between the top dead center and the bottom dead center, and the stator core (22) And a field coil (26) for moving the movable iron core (21) to the top dead center and the bottom dead center by alternately switching between the top dead center and the bottom dead center of the movable iron core (21),
The cutting blade (5) is connected to the movable iron core (21) of one linear actuator (29),
Furthermore, by controlling the energization of the field coil (26) of each linear actuator (29), the power source that switches the maximum magnetic field position of each stator core (22) between top dead center and bottom dead center at a predetermined cycle Circuit (24) and
The power circuit (24) energizes the field coil (26) of each linear actuator (29) to reciprocate the movable iron core (21) of each linear actuator (29) in opposite directions. The cutting machine according to any one of claims 1 to 3.   The cutting machine according to any one of claims 1 to 4, which is a silicon steel plate formed by laminating a movable iron core (21).

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