JP2017177312A - Cutting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting machine that can change operational force required for bringing a cutting part close to a proximal part.SOLUTION: The cutting machine 10 includes: the proximal part 12 for supporting a processed material 11; the cutting part 14 having a cutting blade 23 for cutting the processed material 11 and capable of coming close to and separating apart from in a first direction B1 relative to the proximal part 12; a torsion spring 27 adding urging force to the cutting part 14 to urge the cutting part 14 in a direction of separating apart from the proximal part 12; and a bolt 28 for adjusting the urging force added to the cutting part 14 from the torsion spring 27.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cutting machine that cuts a workpiece supported by a base with a cutting blade.

  Patent Document 1 discloses a cutting machine having a base that supports a workpiece and a cutting blade that cuts the workpiece. The cutting machine described in Patent Document 1 includes a base portion that supports a workpiece, a turntable provided on the base portion, a tilting portion that can be tilted on the turntable, and swingable with respect to the tilting portion. The attached swinging part, the cutting part attached to the swinging part, the cutting blade provided at the cutting part, the motor provided at the cutting part for driving the cutting blade, and provided at the cutting part and cutting And a handle that is gripped when the portion is swung toward the turntable.

  The tilting portion is provided with a swing support arm, and the swing portion is attached to the tilt portion via the swing support arm. A spring is provided between the swing part and the swing support arm, and the swing part is biased upward. Therefore, the cutting portion is at the uppermost position when the workpiece is not cut. When an operator cuts a workpiece, he or she holds the handle and pushes down the cutting portion against the biasing force of the spring.

JP 2010-274387 A

  However, if there is a difference among individuals in the force with which the operator operates the handle, the cutting machine described in Patent Document 1 may have difficulty performing the operation of bringing the cutting portion closer to the base.

  The objective of this invention is providing the cutting machine which can change the operation force required in order to make a cutting part approach a base.

  An embodiment of the present invention includes a base portion that supports a workpiece, and a cutting portion that has a cutting blade that cuts the workpiece and is capable of approaching and moving away from the base portion in a first direction. An urging mechanism that applies an urging force to the cutting portion to urge the cutting portion in a direction away from the base, and adjusts the urging force applied from the urging mechanism to the cutting portion. An adjustment mechanism.

  According to the embodiment of the present invention, it is possible to change the operating force necessary to bring the cutting portion closer to the base.

It is sectional drawing seen from the front which shows the specific example 1 of a cutting machine. It is a fragmentary sectional view of the cutting machine shown in FIG. (A), (B) is a side view of the cutting machine shown in FIG. (A), (B) is sectional drawing which shows the specific example 2 of a cutting machine. It is a side view of the cutting machine shown in FIG. It is the fragmentary sectional view seen from the front which shows the specific example 3 of a cutting machine. It is the fragmentary sectional view which looked at the cutting machine shown in FIG. (A) is sectional drawing which shows the principal part of FIG. 6, (B) is sectional drawing which shows the principal part of FIG.

  Hereinafter, an embodiment of a cutting machine will be described in detail with reference to the drawings. In each figure, the same code | symbol is attached | subjected to the common member.

(Specific example 1)
The cutting machine 10 shown in FIGS. 1 to 3 includes a base 12 that supports the workpiece 11, a turntable 13 attached to the base 12, and a cutting part 14 attached to the turntable 13. The cutting machine 10 can be carried by an operator, and can be used by placing the cutting machine 10 on a work table. The cutting machine 10 is a desktop type cutting machine.

  A positioning member 15 is provided on the base 12, and the positioning member 15 positions the workpiece 11. The base 12 has a support surface 12A that supports the workpiece 11. The turntable 13 is made of metal, and the turntable 13 can rotate with respect to the base portion 12. A lever 16 is attached to the turntable 13. An operator can hold the lever 16 and turn the turntable 13 in the horizontal direction.

  A hinge 17 that connects the turntable 13 and the cutting portion 14 is provided. The hinge 17 is made of metal, and the hinge 17 is attached to the turntable 13 via the second support shaft 18. When the hinge 17 rotates about the second support shaft 18 in the second direction B2, the cutting portion 14 tilts with respect to the turntable 13 in the second direction B2 as shown in FIGS. Is possible. That is, the second support shaft 18 functions as an inclined support portion that supports the cutting portion 14 so as to be inclined. Further, a lock mechanism for fixing the hinge 17 within a rotation range with respect to the turntable 13 is provided. The lock mechanism will be described later.

  The cutting portion 14 is fixed to a boss portion 20 attached to the hinge 17 via the first support shaft 19, an electric motor 21 supported by the boss portion 20, and a rotating shaft 22 that rotates with the power of the electric motor 21. A circular cutting blade 23, an outer cover 24 provided continuously to the boss portion 20 and covering the outer periphery of the cutting blade 23, an inner cover 25 attached to the outer cover 24, and a handle 26 provided on the outer cover 24 Have. The cutting blade 23 is a metal circular saw blade.

  The boss portion 20 is made of metal, and the boss portion 20 can rotate, that is, swing around the first support shaft 19 with respect to the second support shaft 18. In other words, the first support shaft 19 functions as a swing support portion that enables the cutting portion to swing so as to approach and separate from the base portion 12 and the turntable 13. When the cutting machine 10 is placed on the work table, the first support shaft 19 is positioned above the second support shaft 18. When the cutting machine 10 is viewed in plan, the center line A2 of the first support shaft 19 is disposed at right angles to the center line A1 of the second support shaft 18. The inner cover 25 is movable with respect to the outer cover 24 within a predetermined range around the rotation shaft 22.

  An operation unit is provided on the handle 26, and the operation unit has a run button and a stop button. When the operator operates the operation button, electric power is supplied from the power source to the electric motor 21 and the rotating shaft 22 rotates. The power source may be either an AC power source or a DC power source. When the operator operates the stop button, power is not supplied from the power source to the electric motor 21, and the electric motor 21 stops.

  The cutting part 14 is rotatable about the first support shaft 19 in the first direction B1. The first direction B1 is a direction different from the second direction B2. The first direction B1 and the second direction intersect. The first direction B1 is a direction that approaches and separates from the base 12. A torsion spring 27 is provided as a biasing mechanism that biases the cutting portion 14 in a direction away from the base portion 12. The torsion spring 27 is made of metal and is attached to the outer periphery of the first support shaft 19.

  A screw hole is provided in the boss portion 20, and a bolt 28 is inserted into the screw hole. In a plan view of the cutting machine 10, the center line A <b> 3 of the bolt 28 is perpendicular to the center line A <b> 2 of the first support shaft 19. When the bolt 28 is rotated, the bolt 28 moves in the direction of the center line A3 with respect to the boss portion 20. The first end 29 of the torsion spring 27 contacts the tip of the bolt 28, and the second end 30 of the torsion spring 27 contacts the hinge 17. The boss part 20 has a first stopper 31 and a second stopper 32. The first stopper 31 and the second stopper 32 restrict the range in which the cutting portion 14 rotates in the first direction B1 with respect to the base portion 12.

  An example of use of the cutting machine 10 will be described. As shown in FIGS. 3A and 3B, the center of gravity W <b> 1 of the cutting portion 14 is located above the rotation shaft 22. For this reason, the cutting part 14 tends to rotate clockwise in FIG. 1 around the first support shaft 19 by its own weight. On the other hand, the urging force of the torsion spring 27 is transmitted to the cutting part 14 via the bolt 28. The urging force of the torsion spring 27 urges the cutting portion 14 counterclockwise in FIG. The counterclockwise urging force transmitted from the torsion spring 27 to the cutting portion 14 is larger than the force that the cutting portion 14 tries to rotate clockwise by its own weight. A part of the boss portion 20 comes into contact with the first stopper 31, and the cutting portion 14 stops at the upper limit position.

  After the operator operates the operation button to drive the electric motor 21, the handle 26 is gripped to apply an operating force to the cutting unit 14, and the clockwise operating force applied to the cutting unit 14 is applied from the torsion spring 27 to the cutting unit 14. When the counterclockwise urging force applied to is exceeded, the cutting portion 14 rotates clockwise about the first support shaft 19. For this reason, the cutting blade 23 cuts the workpiece 11. The range in which the cutting portion 14 rotates clockwise with the first support shaft 19 as a fulcrum is restricted by the boss portion 20 contacting the second stopper 32. The position of the cutting part 14 when the boss part 20 contacts the second stopper 32 is the lower limit position. As described above, the cutting portion 14 is rotatable around the first support shaft 19 within the range between the upper limit position and the lower limit position.

  When the operating force applied to the handle 26 by the operator is reduced and the clockwise operating force applied to the cutting portion 14 becomes smaller than the counterclockwise biasing force applied to the cutting portion 14 from the torsion spring 27, the cutting portion 14 is The urging force of the torsion spring 27 rotates counterclockwise around the first support shaft 19 and stops at the upper limit position. The urging force of the torsion spring 27 is a restoring moment about the first support shaft 19.

  Further, as shown in FIGS. 3A and 3B, the cutting portion 14 is rotated about the second support shaft 18, thereby supporting the center line A <b> 5 in the thickness direction of the cutting blade 23 and the base 12. The compression angle θ1 formed between the surface 12A can be changed. The compression angle θ1 can be changed from 90 degrees to a predetermined angle of less than 90 degrees.

  When the cutting machine 10 changes the position of the bolt 28 in the direction of the center line A3, the urging force applied to the cutting part 14 from the torsion spring 27 is changed. As shown in FIG. 2, when the bolt 28 is brought close to the first support shaft 19, the acute angle side formed between the first end portion 29 and the second end portion 30 with the cutting portion 14 being in the upper limit position. The angle, that is, the compression angle θ2 is reduced. That is, the urging force applied to the cutting part 14 from the torsion spring 27 increases. On the other hand, when the bolt 28 is moved in a direction away from the first support shaft 19, the compression angle θ2 is increased in a state where the cutting portion 14 is at the upper limit position. That is, the urging force applied to the cutting part 14 from the torsion spring 27 is reduced. The bolt 28 is an urging force adjusting mechanism.

  For this reason, if the urging | biasing force added to the cutting part 14 from the torsion spring 27 is changed according to the use condition of the cutting machine 10, workability | operativity will improve. For example, the urging force applied to the cutting portion 14 from the torsion spring 27 can be changed according to individual differences in the arm strength of the worker. Further, when the workpiece 11 is continuously cut in a short time, if the biasing force applied to the cutting portion 14 from the torsion spring 27 is reduced, the operation force applied to the handle 26 by the operator can be reduced.

  Further, when the urging force of the torsion spring 27 is lowered due to a change with time while the cutting portion 14 is in the upper limit position, the urging force of the torsion spring 27 can be increased by bringing the bolt 28 closer to the first support shaft 19. . Therefore, it can suppress that the urging | biasing force which returns the cutting | disconnection part 14 to an upper limit position is insufficient.

  Furthermore, since the position of the bolt 28 in the direction of the center line A3 can be continuously changed, the urging force applied to the cutting part 14 from the torsion spring 27 can be changed steplessly. Furthermore, the urging force can be adjusted by a simple operation of rotating the bolt 28, and the support position of the torsion spring 27 in the direction of the center line A3 can be reliably fixed.

(Specific example 2)
4 and 5 show a specific example 2 of the cutting machine 10. The cutting machine 10 has a shaft member 33 as an adjustment mechanism. The shaft member 33 is rotatable with respect to the hinge 17. A center line A4 around which the shaft member 33 rotates is parallel to the center line A2. The levers 34 are provided at both ends of the shaft member 33 in the direction of the center line A4. The operator holds the lever 34 and rotates the shaft member 33. The shaft member 33 has a circular cross-sectional shape, and is provided with a notch 35 in which a part of the shaft member 33 in the circumferential direction is cut out. The first end portion 29 of the torsion spring 27 contacts the boss portion 20, and the second end portion 30 contacts the outer peripheral surface of the shaft member 33.

  When the shaft member 33 is rotated, the urging force applied to the cutting portion 14 from the torsion spring 27 can be changed. As shown in FIG. 4A, when the second end portion 30 is positioned at a place other than the notch portion 35 by the shaft member 33, the urging force applied from the torsion spring 27 to the cutting portion 14 is large. As shown in FIG. 4B, when the second end portion 30 is positioned at the notch portion 35 by the shaft member 33, the urging force applied to the cutting portion 14 from the torsion spring 27 is reduced. This is because the compression angle θ2 formed between the first end portion 29 and the second end portion 30 is larger in FIG. 4B than in FIG. 4A. By rotating the shaft member 33, the urging force applied from the torsion spring 27 to the cutting portion 14 can be changed in two stages. The cutting machine 10 shown in FIGS. 4 and 5 can obtain the same effect as the cutting machine 10 shown in FIGS. Furthermore, since the levers 34 are provided at both ends of the shaft member 33 in the direction of the center line A4, the operator can easily and appropriately adjust the biasing force from the lever 16 side, that is, from the standing position during the operation, from the right hand to the left hand. .

(Specific example 3)
6 and 7 show a specific example 3 of the cutting machine 10. FIGS. 8A and 8B are main parts in the specific example 3 of the cutting machine 10. A guide hole 36 is provided in the boss portion 20. The guide hole 36 is arranged in an arc shape around the second support shaft 18.

  A screw hole is provided in the turntable 13, and a bolt 37 is inserted into the screw hole. A lever 38 is fixed to the bolt 37. An operator can grasp the lever 38 and rotate the bolt 37 to tighten and loosen the bolt 37. The shaft portion of the bolt 37 is disposed in the guide hole 36. When the bolt 37 is loosened, the cutting portion 14 can rotate in the second direction B2 about the second support shaft 18 with respect to the base portion 12 within a range in which the bolt 37 can move within the guide hole 36. It is. When the bolt 37 is fastened and fixed, the cutting portion 14 is positioned and fixed with respect to the base portion 12 in the second direction B2.

  A support hole 39 is provided in the hinge 17, and a metal support pin 40 is disposed in the support hole 39. The support pin 40 is movable in a direction perpendicular to the center line A2. The second end 30 of the torsion spring 27 is pressed against the upper end of the support pin 40. A rolling element 41 is rotatably attached to the lower end of the support pin 40. Thus, the support pin 40 is pushed toward the cam surface 44 by the urging force of the torsion spring 27. The rolling element 41 is disposed outside the support hole 39. The second support shaft 18 is disposed between the bolt 37 and the support pin 40 in a plan view perpendicular to the center line A1.

  A cam 43 is provided on the turntable 13. The cam 43 is fixed to the turntable, and the cam 43 is made of metal. The cam 43 has a cam surface 44, and the cam surface 44 is curved in a plan view perpendicular to the center line A1. The distance L1 from the center line A2 to the cam surface 44 continuously changes in the direction of the center line A2. As shown in FIG. 8B, the cam surface 44 is curved such that the distance L1 increases as the distance from the bolt 37 increases. The distance L1 is a length in a direction perpendicular to the center line A2.

  The cutting machine 10 shown in FIGS. 6 and 7 can change the urging force applied from the torsion spring 27 to the cutting part 14 when the cutting part 14 is rotated about the second support shaft 18. FIG. 7 corresponds to the case where the compression angle θ1 shown in FIG. 3B is 90 degrees. In this case, the distance L1 from the center line A2 to the contact point D1 between the rolling element 41 and the cam surface 44 is the minimum. The compression angle θ2 formed between the first end portion 29 and the second end portion 30 is the minimum. That is, the urging force applied to the cutting part 14 from the torsion spring 27 is the maximum.

  On the other hand, when the cutting portion 14 is tilted to the maximum with respect to the base portion 12 and the compression angle θ1 shown in FIG. 3B is minimum, the distance L1 is maximum as shown in FIG. 8B. . In this case, the compression angle θ2 formed between the first end portion 29 and the second end portion 30 is maximized as shown in FIG. The distance L1 changes continuously and the compression angle θ2 also changes continuously in conjunction with the movement of the cutting portion 14 about the second support shaft 18. The smaller the compression angle θ2, the greater the urging force applied from the torsion spring 27 to the cutting part 14.

  Also in the cutting machine 10 shown in FIG.6 and FIG.7, the urging | biasing force added to the cutting part 14 from the torsion spring 27 can be changed, and the effect similar to the specific example 1 of the cutting machine 10 can be acquired.

  On the other hand, when the cutting portion 14 is brought close to the base portion 12, the operating force necessary for operating the handle 26 increases as the compression angle θ1 formed between the cutting blade 23 and the upper surface of the turntable 13 decreases. This is because there is a difference between the direction in which the weight of the cutting portion 14 acts and the direction in which the cutting portion 14 rotates about the first support shaft 19, and the weight of the cutting portion 14 changes from the cutting portion 14 to the base 12. This is because the ratio acting as a moment in the approaching direction decreases.

  The third specific example of the cutting machine 10 can continuously reduce the urging force applied from the torsion spring 27 to the cutting portion 14 as the compression angle θ1 formed between the cutting blade 23 and the upper surface of the turntable 13 decreases. That is, when the cutting part 14 is brought close to the base part 12, it is possible to suppress an increase in operating force necessary for operating the handle 26, and workability is improved. Further, the rolling element 41 rolls along the cam surface 44 in conjunction with the rotation of the cutting portion 14 around the second support shaft 18, and the support pin 40 is in a direction perpendicular to the center line A2. Move automatically. Therefore, the operator does not need to perform a dedicated operation for changing the urging force applied to the cutting portion 14 from the torsion spring 27, and the workability is improved.

  The torsion spring 27 is an urging mechanism, and the bolt 28, the shaft member 33, the support pin 40, and the cam 43 are adjustment mechanisms. The support pin 40 is a movable member, and the bolt 28 and the shaft member 33 are support members. The compression angle θ1 represents the distance between the first end portion and the second end portion as an angle.

  The cutting machine is not limited to the above embodiment, and can be variously modified without departing from the gist thereof. For example, a spring as a biasing mechanism may be a plate spring or a coil spring instead of the torsion spring. The urging mechanism can use a rubber-like elastic body instead of the metal spring. It is also possible to express the distance between the first end and the second end by the shortest distance.

  DESCRIPTION OF SYMBOLS 10 ... Cutting machine, 11 ... Work material, 12 ... Base part, 14 ... Cutting part, 18 ... 2nd support shaft, 19 ... 1st support shaft, 23 ... Cutting blade, 27 ... Torsion spring, 28 ... Bolt, 29 ... 1st end part, 30 ... 2nd end part, 33 ... Shaft member, 40 ... Supporting pin, 43 ... Cam, B1 ... 1st direction, B2 ... 2nd direction.

Claims (8)

A cutting machine comprising: a base that supports a workpiece; and a cutting portion that has a cutting blade that cuts the workpiece and is capable of approaching and separating from the base in a first direction,
An urging mechanism for applying an urging force to the cutting portion to urge the cutting portion in a direction away from the base; and
An adjustment mechanism for adjusting the urging force applied to the cutting portion from the urging mechanism;
Having a cutting machine. The biasing mechanism has a spring,
The first end of the spring is supported by the base,
A second end of the spring is supported by the cutting portion;
The cutting machine according to claim 1, wherein the adjustment mechanism adjusts a biasing force applied to the cutting portion by changing a distance between the first end portion and the second end portion. The adjustment mechanism includes a support member that is in contact with the first end or the second end and is rotatably arranged.
The cutting machine according to claim 2, wherein a distance between the first end and the second end is changed when the support member rotates.   The cutting machine according to claim 3, wherein the support member is disposed between the second end portion and the cutting portion.   The cutting machine according to claim 3, wherein the support member is disposed between the first end and the base. A first support shaft that supports the cutting portion and allows the cutting portion to rotate in the first direction with respect to the base;
A second support shaft that supports the cutting portion and allows the cutting portion to rotate with respect to the base portion in a second direction different from the first direction;
Is provided,
The adjustment mechanism adjusts a biasing force applied from the biasing mechanism to the cutting portion in conjunction with an operation of rotating the cutting portion with respect to the base portion in the second direction. Any one of the cutting machines. The biasing mechanism is a torsion spring attached to the first support shaft,
The torsion spring has a first end and a second end;
The adjustment mechanism changes a distance between the first end and the second end in conjunction with an operation of rotating the cutting portion with respect to the base in the second direction. The cutting machine described. The adjustment mechanism is
A movable member provided to be movable with respect to the base and in contact with the second end;
Rolling elements provided on the movable member;
A cam provided on the base and in contact with the rolling element;
Have
In conjunction with the operation of rotating the cutting portion with respect to the base portion in the second direction, the rolling element rolls in a state of contacting the cam, and the movable member moves to move the first end portion. The cutting machine according to claim 7, wherein a distance between the second end portion is changed.

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