JP2014172133A - Circle cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circle cutter easy to change a diameter of a circle to be cut in a circular form, preventing a cut object from being damaged by operator' carelessness, and facilitating the cutting operation of an operator.SOLUTION: A circle cutter 10 for cutting a flat plate-like cut object in a circular form, includes: a body part 20; a support part 30 rotatably supporting the body part 20 around the vertical axis; two move parts 50R and 50L provided on the body part 20 in such a manner as to be symmetrically movable in the horizontal direction along the body part 20, centering the vertical axis; and a fixing part 44 for fixing the move parts 50R and 50L to the body part 20. The support part 30 includes a pressing part 31, a pedestal part 32 positioned below the body part 20, and a pivot 33 pivotally supporting the body part 20, and the move parts 50R and 50L include blade parts 51R and 51L.

Description

  The present invention relates to a circle cutter that cuts a flat cutting object into a circular shape.

  Some conventional circle cutters have a cylindrical main body rotatably provided on the upper surface of a disk-shaped fixing plate, and include a cutting edge on the side surface of the cylindrical main body (for example, Patent Document 1). The circle cutter described in Patent Document 1 is to be cut with a cutting blade provided on the side of the main body by holding the cutting plate by placing a fixed plate on the cutting target and rotating the cylindrical main body. The object is cut into a circular shape. In addition, a rectangular main body, a movable body provided so as to be movable along the long side of the rectangular main body, a shaft seat body having a needle-like body at a lower portion provided in the movable body, and a main body are provided. There are some which are comprised from the provided blade body and the support means which rotatably supports the main body provided in the moving body (for example, patent document 2). The circle cutter described in Patent Document 2 is a blade provided on the main body by holding the shaft object on the object to be cut, holding the object to be cut, and rotating the rectangular main body. The object to be cut is cut into a circular shape.

Japanese Utility Model Publication No. 61-39393 JP 2009-247640 A

  However, the circle cutter described in Patent Document 1 needs to change the cylindrical main body when changing the diameter of a circle to be cut into a circular shape, and the diameter of the circle to be cut into a circular shape cannot be easily changed. Moreover, the circle cutter of patent document 2 has a needle-like body in the shaft seat body which presses a cutting target object. This needle-like body prevents the pivot center of the main body from shifting due to piercing the object to be cut, and has a structure in which the tip of the needle-like body can be taken in and out from the lower part of the shaft seat body. However, due to the carelessness of the operator, the shaft seat body is placed on the cutting object with the tip of the needle-like body protruding from the lower part of the shaft seat body by mistake, and unnecessary holes etc. are formed in the cutting object. May cause scratches. Furthermore, since the circle cutter described in Patent Document 2 has only one blade body, it is necessary to rotate the blade body once around the shaft seat body, and the operator's cutting operation is large and the work efficiency is poor. . Accordingly, an object of the present invention is to easily change the diameter of a circle to be cut into a circular shape, to prevent the cutting object from being damaged by carelessness of the operator, and for the operator to perform cutting work. The present invention provides a circle cutter that facilitates the above.

For this reason, the invention according to claim 1 is a circle cutter for cutting a flat cutting object into a circular shape.
The circle cutter includes a main body part,
A support portion that supports the main body portion so as to be rotatable about a vertical axis;
Two moving parts provided on the main body part so as to be symmetrically movable in the horizontal direction about the vertical axis along the main body part;
It consists of a fixing part that fixes the moving part to the main body part,
The support portion includes a presser portion located above the main body portion,
A pedestal located below the main body,
A pivot that pivotally supports the main body,
The moving portion includes a blade portion that cuts the cutting object.

The invention according to claim 2 is the circle cutter according to claim 1,
The support part is provided with a rotating means for rotating the main body via a gear.

The invention according to claim 3 is the circle cutter according to claim 1 or 2,
The main body includes a scale.

  According to the first aspect of the present invention, in the circle cutter for cutting a flat plate-shaped cutting object into a circular shape, the circle cutter supports the main body and the main body so as to be rotatable about a vertical axis. A supporting portion; two moving portions provided on the main body portion so as to be symmetrically movable in the horizontal direction about the vertical axis along the main body portion; and a fixing portion that fixes the moving portion to the main body portion. The support portion includes a presser portion located above the main body portion, a pedestal portion located below the main body portion, and a pivot that pivotally supports the main body portion, and the moving portion includes: The blade part which cut | disconnects a cutting target is provided.

  Therefore, the diameter of the circle to be cut into a circular shape can be easily changed, and it is possible to prevent the object to be cut from being damaged by carelessness of the operator, and to make the operator's cutting work easy. Can be provided. Moreover, even when the cutting object has a hollow or a recess, the cutting object can be cut into a circular shape whose center is located in the hollow or the recess by filling the second mounting portion in the hollow or the recess. is there.

  According to the second aspect of the present invention, since the support portion is provided with the rotating means for rotating the main body via the gear, the operation of the operator's cutting operation can be reduced, and the cutting operation can be performed. It becomes easy and shortening of cutting work time can be aimed at.

  According to invention of Claim 3, since the said main-body part is equipped with a scale, the diameter of the circle | round | yen to cut | disconnect can be adjusted easily and cutting | disconnection operation | work becomes still easier.

It is a perspective view which shows an example of the circle cutter of this invention. It is a front view of the circle cutter in FIG. It is a top view of the circle cutter in FIG. It is a bottom view of the circle cutter in FIG. It is the sectional view on the AA line of the circle cutter in FIG. It is a BB sectional view of the circle cutter in FIG. It is a figure for demonstrating the moving structure of a moving part. It is a figure for demonstrating the moving structure of the moving part of another example of the circle cutter of this invention. It is a figure for demonstrating the rotation structure of the main-body part of another example of the circle cutter of this invention.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. 1 is a perspective view showing an example of the circle cutter of the present invention, FIG. 2 is a front view of the circle cutter in FIG. 1, FIG. 3 is a plan view of the circle cutter in FIG. 1, and FIG. It is a bottom view of the circle cutter in. The circle cutter 10 includes a main body unit 20, a support unit 30, and moving units 50R and 50L.

  The main body 20 has a rectangular tube shape that is long in the left-right direction in plan view, and includes a top plate 21, a front side plate 22, a rear side plate 23, a bottom plate 24, and the like. Through holes 26 and 27 penetrating in the vertical direction are formed in the left and right center portions of the top plate 21 and the bottom plate 24. Openings 25 </ b> R and 25 </ b> L that are elongated along the long side of the bottom plate 24 and are symmetrical about the through holes 26 and 27 are formed in the right side and the left side of the bottom plate 24. On the upper surface of the right end portion of the top plate 21, a grip portion 28 is provided that is rotatable about the vertical axis with respect to the main body portion 20. The grip portion 28 has a cylindrical shape and has a protruding portion that protrudes in the radial direction at the upper end portion. Note that the grip 28 is not limited to the above-described configuration as long as the grip 28 can grip and rotate the main body 20 when a cutting target to be described later is cut into a circular shape. For example, it may be provided on the upper surface of the left end portion of the top plate 21 or may have a configuration without the grip portion 28.

  As shown in FIG. 5 and FIG. 6, a pivot 33 provided in a support portion 30 to be described later is passed through the through holes 26 and 27. The through hole 27 is fitted to a groove portion 40 provided in the pivot 33 and pivotally supports the pivot 33, and the main body 20 is configured to be rotatable in the horizontal direction around the pivot 33. . Further, the through hole 27 is fitted in the groove portion 40, thereby restricting the main body portion 20 from moving upward with respect to the pivot 33. The main body 20 is rotatable in the horizontal direction around the pivot 33, and two moving parts 50R and 50L described later are pivoted along the main body 20 as the pivot of the main body 20. Anything that can be moved symmetrically in the horizontal direction around 33 may be used. Therefore, the outer shape of the main body 20 is not limited to the above-described shape. For example, the outer shape of the main body 20 may be a circular shape in plan view or an elliptical shape.

  The support portion 30 includes a presser portion 31 positioned above the main body portion 20, a pedestal portion 32 positioned below the main body portion 20, and a pivot 33 that pivotally supports the main body portion 20. The presser portion 31 has a cylindrical shape, has a protruding portion 34 protruding in the radial direction at the upper end portion, and is fixed to the upper end portion of the pivot 33 by a nut. The fixing of the presser part 31 to the pivot 33 is not limited to the above-described configuration. For example, fixing by an adhesive, a female screw is provided in the presser part 31, and a male screw is provided at the upper end of the pivot 33. It may be fixed by a screw structure. Further, the presser portion 31 is not limited to the above-described shape, and may be, for example, a shape without the projecting portion 34 or a rectangular tube shape, and is provided with a knurling used for preventing slippage on the outer surface. It may be.

  The pedestal portion 32 includes a first placement portion 35, a second placement portion 36, and the like. The first mounting portion 35 has a disk shape, is fixed to the lower end portion of the pivot 33 by a nut through a washer, and the pivot 33 is located at the center of the first mounting portion 35. The second mounting portion 36 has a disk shape with a smaller diameter than the first mounting portion 35, and is provided at the bottom of the first mounting portion 35 so as to be concentric with the first mounting portion 35. ing. Here, a plurality of concave portions 37 having a circular shape in a bottom view are provided on the bottom portion of the first mounting portion 35, and a receiving portion of a space expanded in the radial direction is formed on the upper end portion of the concave portion 37. . A plurality of columnar convex portions 38 are vertically provided on the top portion of the second placement portion 36, and a protruding portion protruding in the radial direction is formed on the upper end portion of the convex portion 38. By inserting the convex portion 38 of the second placement portion 36 into the concave portion 37 of the first placement portion 35 and the protrusion of the convex portion 38 fitting into the receiving portion of the concave portion 37, the second placement portion 36 is The first mounting portion 35 is detachably provided. In addition, the 2nd mounting part 36 should just be provided in the 1st mounting part 35 so that attachment or detachment is possible, and the structure is not limited above. Further, the first mounting part 35 is fixed to the pivot 33 by a nut in a recess 39 provided at the bottom of the first mounting part 35. Therefore, there is no member (a nut or the lower end portion of the pivot 33) that protrudes downward from the bottom of the first placement portion 35. Note that the configuration of the first mounting portion 35 is not limited to the above as long as the first mounting portion 35 is fixed to the lower end portion of the pivot 33, and may be fixed by an adhesive or the like, for example.

  In addition, the base part 32 should just be a structure which has the mounting surface at the time of mounting on a cutting target object, and is not limited to the above-mentioned structure. For example, the structure which does not have the 2nd mounting part 36 may be sufficient. Moreover, the 1st mounting part 35 and the 2nd mounting part 36 may be a bottom view square shape or a triangular shape, and are not specifically limited.

  The pivot 33 is inserted into through holes 26 and 27 formed at the center in the left-right direction of the top plate 21 and the bottom plate 24 of the main body 20. The pivot 33 has a through hole 27 fitted in a groove 40 provided in the pivot 33 to pivotally support the main body 20, and the main body 20 can be rotated in the horizontal direction around the pivot 33. By fitting the through hole 27 in the groove portion 40, the main body portion 20 is restricted from moving upward with respect to the pivot 33. The main body 20 rotates while the outer peripheral surface of the groove 40 of the pivot 33 and the inner peripheral surface forming the through hole 27 are in contact with each other, and the top surface of the washer and the bottom surface 29 of the bottom plate 24 are in contact with each other. Since the contact surface as described above is formed, it is possible to smoothly rotate the main body 20 while suppressing backlash. The configuration for rotating the main body 20 is not limited to the above-described configuration as long as the main body 20 can be rotated about the vertical axis. Rotation may be possible.

  Further, the pivot 33 penetrates through the main body 20, has a pressing portion 31 at the upper end portion, and has a pedestal portion 32 at the lower end portion, so that a cutting target when cutting a cutting target to be described later into a circular shape is provided. When the work table of the object and the support unit 30 is fixed, the force of pressing the presser unit 31 from above is transmitted to the pedestal unit 32 without being dispersed and can be fixed securely.

  A cylindrical adjustment member 41 that is rotatable with respect to the pivot 33 is attached to the pivot 33. The adjustment member 41 has a protruding portion 42 protruding in the radial direction at the upper end portion, a pinion gear 43 at the lower end portion, and a male screw is provided on the outer peripheral surface between the protruding portion 42 and the pinion gear 43. A fixing portion 44 is provided in which a female screw fitted to the male screw is provided on a cylindrical inner peripheral surface. Knurls used for preventing slipping are provided on the outer peripheral surfaces of the protruding portion 42 and the fixed portion 44.

  The adjustment member 41 is disposed in a state where the pinion gear 43 is located in the main body portion 20 and the top plate 21 of the main body portion 20 is located between the pinion gear 43 and the fixing portion 44. The pinion gear 43 meshes with rack gears 53R and 53L of moving parts 50R and 50L, which will be described later. The pinion gear 43 is rotated by rotating the projecting part 42, and the moving parts 50R and 53L are moved by moving the rack gears 53R and 53L. 50L moves. Further, by screwing the fixing portion 44, the top plate 21 of the main body portion 20 can be sandwiched between the pinion gear 43 and the fixing portion 44, and the rotation of the pinion gear 43 can be stopped, and the movement of the rack gears 53R and 53L is stopped. Is done. Therefore, the movement of the moving parts 50R and 50L is stopped, and the moving parts 50R and 50L are fixed to the main body part 20. In addition, the fixing | fixed part 44 is not limited to the above-mentioned structure, What is necessary is just to be able to fix the moving parts 50R and 50L to the main-body part 20. FIG. For example, the structure which provides in the moving parts 50R and 50L the member which fixes directly the moving parts 50R and 50L and the main-body part 20 may be sufficient.

  As shown in FIG. 7, the moving parts 50R and 50L are configured by blade parts 51R and 51L, moving part main bodies 52R and 52L, rack gears 53R and 53L, and the like. The moving part main bodies 52R and 52L have a quadrangular prism shape in which the width W1 in the vertical direction when viewed from the front is substantially the same as the width between the top plate 21 and the bottom plate 24 of the main body part 20.

  The moving part main body 52R has a rack gear 53R fixed to the front side part with a bolt with the gear teeth facing rearward, and a blade part 51R for cutting a cutting object on the right side part. A groove is provided on the right side of the moving part main body 52R, and the upper part of the blade 51R is fitted in the groove. The lower part of the blade part 51R is a blade edge and protrudes downward from the bottom part of the moving part main body 52R. The blade portion 51R has an upper portion fixed to the moving portion main body 52R with a bolt via an attachment member. Since the upper part of the blade part 51R is fitted and fixed in the groove part, the blade part 51R can be firmly fixed to the moving part main body 52R, and the deviation or backlash of the blade part 51R when cutting the object to be cut. Can be prevented. The blade 51 is attached to a blade edge of the blade 51R on a straight line 60 that passes through the center of the pivot 33 and is parallel to the long side of the main body 20 in a state where a moving part 50R described later is attached to the main body 20. It is attached so that is located. The moving part 50R to which the rack gear 53R is attached has a width W2 in the front-rear direction in plan view that is substantially the same as the width between the front side plate 22 and the rear side plate 23 of the main body part 20.

  The moving part main body 52L has a rack gear 53L fixed to the rear side part with a bolt with the gear teeth facing forward, and a blade part 51L that cuts the object to be cut on the left side part. The rack gear 53R and the rack gear 53L have the same pitch. Since the blade part 51L is attached to the left side part of the moving part main body 52L with the same configuration as the blade part 51R, the details are omitted.

  Note that the fixing of the blade portions 51R, 51L and the rack gears 53R, 53L to the moving portion main bodies 52R, 52R is not limited to the above-described configuration, and may be, for example, an adhesive. Further, the blade portions 51R and 51L are not limited to the above-described configuration, and can be fixed to the moving portion main bodies 52R and 52R, and the blade tips protrude downward from the bottom portions of the moving portion main bodies 52R and 52R. That's fine. For example, a commercially available cutter blade may be used, and a configuration in which a disk-shaped one having a blade on the outer periphery is rotatably attached to the moving unit main bodies 52R and 52R may be used. Moreover, it is good also as a structure which provided the stopper for regulating the moving range of the moving parts 50R and 50L in the both ends of the main-body part 20 so that the moving parts 50R and 50L may not remove | deviate from the main-body part 20.

  Next, the moving structure of the moving units 50R and 50L will be described. The moving parts 50R and 50L are disposed in the main body part 20 at positions symmetrical with respect to the pivot 33, and the top plate 21, the front side plate 22, the rear side plate 23, and the bottom plate 24 of the main body unit 20 are connected to each other. As a guide, it is movable along the long side of the main body 20. The rack gears 53R and 53L of the moving parts 50R and 50L mesh with the pinion gear 43 of the adjustment member 41. When the protrusion 42 of the adjustment member 41 is rotated clockwise in the plan view, the pinion gear 43 is rotated clockwise in the plan view, the rack gear 53R is moved to the left along the main body 20, and the rack gear 53L is moved to the main body. Move to the right along 20. That is, the moving parts 50 </ b> R and 50 </ b> L move in the direction toward the pivot 33. On the other hand, when the protruding portion 42 of the adjustment member 41 is rotated counterclockwise in plan view, the pinion gear 43 is rotated counterclockwise in plan view, the rack gear 53R is moved rightward along the main body portion 20, and the rack gear 53L is It moves to the left along the main body 20. That is, the moving parts 50R and 50L move in directions away from the pivot 33, respectively. Here, since the rack gears 53R and 53L have the same pitch and are moved by one pinion gear 43, the movement amounts thereof are the same. Therefore, the moving parts 50R, 50L are provided so as to be symmetrically movable in the horizontal direction about the pivot 33 along the main body part 20.

  Here, the main body part 20, the pressing part 31, the first mounting part 35 and the second mounting part 36 of the pedestal part 32, the pivot 33, the adjusting member 41, the fixing part 44, and the blade part 51R constituting the circle cutter 10 are provided. , 51L and the moving part main bodies 52R, 52L are not particularly limited. For example, the main body 20 is made of stainless steel, and the pivot 33, the adjusting member 41, the fixing portion 44, the blades 51R and 51L, and the moving main bodies 52R and 52L are made of iron or the like. The two mounting portions 36 may be formed from a rubber sheet or the like.

  Moreover, as shown in FIG. 2, it is good also as a structure provided with the scale SC which makes the center of the pivot 33 of the support part 30 zero on the outer surface of the front side board 22 of the main-body part 20. As shown in FIG. Note that the scale SC may be a scale with the center of the pivot 33 being zero, and may be provided on the outer surface of the top plate 21 or the rear side plate 23 of the main body 20, for example. With such a configuration, since the distance from the center of the pivot 33 to the blade portions 51R and 51L can be easily measured, the moving bodies 50R and 50L are moved while looking at the scale SC, and the blade 33R is moved from the center of the pivot 33 to the blade. It becomes easy to set the distance to the parts 51R and 51L to a desired distance. Therefore, the diameter of the circle to be cut can be easily adjusted, and the cutting operation is further facilitated. Furthermore, it is good also as a structure which provides the protrusion which shows the position of blade part 51R, 51L in moving body 50R, 50L, and makes distance to blade part 51R, 51L a desired distance using this protrusion and scale SC. .

  The size of the circle cutter 10 is such that the long side of the main body 20 is 200 to 1500 mm, the short side is 20 to 100 mm, and the height is about 10 to 30 mm. The diameter is 100 to 500 mm, the thickness is about 3 to 15 mm, the diameter of the second placement portion 36 is 30 to 300 mm, the thickness is about 3 to 15 mm, and the bottom portion of the second placement portion 36 and the presser portion 31 Although the distance to an upper end is about 20-80 mm, it is not specifically limited.

  Moreover, the cutting object cut | disconnected circularly with the circle cutter 10 is flat form, and if it can cut | disconnect with the blade parts 51R and 51L, it will not specifically limit, For example, cardboard, a cardboard, etc. It may be paper, resin sheet, fabric, wood and the like.

  Next, the cutting method of the cutting object using the circle cutter 10 of the present invention shown in FIGS. A cardboard as a cutting object in which a circular through hole is formed is placed on a work table. The adjusting member 41 is rotated to move the moving parts 50R and 50L so that the distance from the center of the pivot 33 to the blade parts 51R and 51L is the same as the radius of the desired cutting circle. Here, since the moving part 50R and the moving part 50L move symmetrically in the horizontal direction around the pivot 33, it is only necessary to match the distance between the blade part 51R and the blade part 51L. Moreover, you may match | combine the distance of the blade part 51R or the blade part 51L by moving either one of the moving parts 50 and 50L directly. When the rotation of the pinion gear 43 is stopped by the fixing portion 44, the movement of the moving portions 50R and 50L is stopped, and the moving portions 50R and 50L are fixed to the main body portion 20. A second mounting portion 36 that fits into the circular through hole of the cardboard is appropriately attached to the bottom of the first mounting portion 35, and the second mounting portion 36 is fitted into the circular through hole of the cardboard from above. Let The presser part 31 is pressed from above with one hand, and the cardboard and the support part 30 are fixed to the work table. Specifically, the bottom portion of the second placement portion 36 is grounded to the work table, and the first placement portion 35 is grounded to the upper surface of the cardboard, whereby the cardboard and the support portion 30 are fixed to the work table. In addition, since the holding part 31 is provided with the protrusion part 34, it is easy to grasp and can be stably fixed to the work table. Here, the blade portions 51R and 51L are in contact with the cardboard.

  In the above-described state, when the grip portion 28 of the main body portion 20 is gripped with the other hand and the main body portion 20 is rotated about the pivot 33, a circular through hole is formed by the blade portions 51R and 51L. The corrugated cardboard can be cut into a circular shape that is concentric with the through hole and has a desired diameter. Here, since the protruding portion is provided at the upper end portion of the grip portion 28, it is easy to grip the grip portion 28. Further, since the grip portion 28 is rotatable about a vertical axis with respect to the main body portion 20, when the grip portion 28 is gripped and the main body portion 20 is rotated about the pivot 33, the grip portion 28 is rotated. The main body 20 can be rotated without changing the grip (grip of the hand), and the corrugated cardboard that is the object to be cut can be easily cut into a circular shape. In addition, since the two blade portions 51R and 52L are in an axially symmetric position with respect to the pivot 33 serving as a rotation center, the corrugated cardboard as a cutting object is cut into a circular shape by only rotating the main body portion by half. Thus, the cutting work can be facilitated and the cutting work time can be shortened.

  In the above description, the corrugated cardboard in which circular through holes are formed is the cutting object, but the diameter and shape of the through holes are not particularly limited. By appropriately changing the shape of the second mounting portion 36 in accordance with the shape of the through hole, even if the through hole of the cardboard is a through hole of various shapes, the corrugated cardboard is desired to be centered in the through hole. It can be cut into a circular shape with a diameter. In addition, even if the through hole is a concave portion, the bottom of the second mounting portion 36 is grounded to the bottom of the concave portion by fitting the second mounting portion 36 in the same manner, and the first mounting portion Since the corrugated board 35 and the upper surface of the corrugated board 35 are brought into contact with each other, the corrugated board and the support portion 30 are fixed to the work table. Moreover, the through-hole and the recessed part do not need to be in a cutting target object. Since the second mounting portion 36 is detachable from the first mounting portion 35, the second mounting portion 36 is removed, and the bottom portion of the first mounting portion 35 is placed on the upper surface of the cutting object. If the cutting is performed in the same manner as described above, the object to be cut can be cut into a circular shape having a desired diameter.

  In the above description, the movement of the moving parts 50R and 50L is performed using the adjustment member 41 having the pinion gear 43 attached to the pivot 33, but is not limited to this structure. The moving parts 50 </ b> R and 50 </ b> L need only be provided so as to be symmetrically movable in the horizontal direction about the pivot 33 that is the rotation center of the main body 20 along the main body 20. For example, the moving parts 50R and 50L may be moved to a desired position by a power source such as a motor. Moreover, as shown in FIG. 8, it is good also as a structure which provides an adjustment member in a main-body part.

  The adjustment member 141 includes a right pinion gear 143R, a left pinion gear 143L, two intermediate gears GE1, GE2, and the like. The right pinion gear 143R extends through the rotation axis AX1. The rotation axis AX1 is pivotally supported by the front side plate 122 and the rear side plate 123 of the main body 120 so as to be rotatable with the axial direction as the front-rear direction. The end of the rotary shaft AX1 on the front plate 122 side protrudes outward from the front plate 122 and has a protruding portion 142 protruding radially at the end. The rotating shaft AX1 is provided with a male screw on the outer peripheral surface between the projecting portion 142 and the front plate 122, and a fixed portion 144 provided with a female screw fitted on the male screw on the cylindrical inner peripheral surface. It is attached to AX1. Knurls used for preventing slipping are provided on the outer peripheral surfaces of the protruding portion 142 and the fixing portion 144. By screwing the fixing portion 144, the fixing portion 144 abuts on the front side plate 122, and the rotation of the right pinion gear 143R can be stopped, and the moving portions 150R and 150L can be fixed to the main body portion 120. it can. The left pinion gear 143L extends through the rotation axis AX2. The rotation axis AX2 is pivotally supported by the front side plate 122 and the rear side plate 123 of the main body 120 so that the axial direction is the front-rear direction. The intermediate gears GE1 and GE2 are rotatably provided at one ends of the rotation shafts AX3 and AX4, respectively, and the other ends of the rotation shafts AX3 and AX4 are fixed to the front plate 122 of the main body 120.

  The right pinion gear 143R and the left pinion gear 143L, and the intermediate gear GE1 and the intermediate gear GE2 are disposed at symmetrical positions of the main body 120 around the pivot 133, respectively. The right pinion gear 143R meshes with the intermediate gear GE1, the intermediate gear GE1 meshes with the intermediate gear GE2, and the intermediate gear GE2 meshes with the left pinion gear 143L. The right pinion gear 143R and the left pinion gear 143L, and the intermediate gear GE1 and the intermediate gear GE2 have the same pitch and pitch circle, respectively. The right pinion gear 143R is provided at a position where it does not contact a rack gear 153L described later. Further, the left pinion gear 143L and the intermediate gears GE1 and GE2 are provided at positions that do not contact a rack gear 153R described later.

  The pivot 133 pivotally supports the main body 120, and the main body 120 is rotatable in the horizontal direction around the pivot 133. The moving parts 150R and 150L are configured by blade parts 151R and 151L, moving part main bodies 152R and 152L, rack gears 153R and 153L, respectively. The widths of the moving part main bodies 152R and 152L in the front view in the vertical direction are substantially the same as the width between the top plate 121 and the bottom plate 124 of the main body part 120, and the width in the front and rear direction in plan view is the same as that of the front side plate 122 of the main part 120. It is a quadrangular prism shape that is substantially the same as the width between the side plates 123.

  The moving part main body 152R has a groove on the upper rear side, the rack gear 153R is fixed with a bolt with the gear teeth facing downward in the groove, and the blade part 151R that cuts the cutting object on the right side. Is provided. The blade portion 151R is attached with the same configuration as described above.

  The moving part main body 152L is provided with a groove in the upper front side, the rack gear 153L is fixed with a bolt with the gear teeth facing downward in the groove, and the blade part 151L for cutting the object to be cut is provided on the left side. Prepare. The blade portion 151L is attached with the same configuration as the blade portion 151R. Further, the rack gear 153R and the rack gear 153L have the same pitch.

  Next, the moving structure of the moving units 150R and 150L will be described. The moving parts 150R and 150L are disposed in the main body part 120 at positions symmetrical with respect to the pivot 133, and the top plate 121, the front side plate 122, the rear side plate 123, and the bottom plate 124 of the main body unit 120 are connected. As a guide, it can move along the long side of the main body 120. When the protrusion 142 of the adjustment member 141 is rotated clockwise in the front view, the pinion gear 143R is rotated clockwise in the front view, and the rack gear 153R is moved in the right direction along the main body 120. Further, the intermediate gear GE1 rotates counterclockwise when viewed from the front, the intermediate gear GE2 rotates clockwise when viewed from the front, the pinion gear 143L rotates counterclockwise when viewed from the front, and the rack gear 153L rotates along the main body 120. Move in the direction. That is, the moving units 150R and 150L move in a direction away from the pivot 133. On the other hand, when the projecting portion 142 of the adjustment member 141 is rotated counterclockwise when viewed from the front, the pinion gear 143R, the intermediate gear GE1, the intermediate gear GE2, and the pinion gear 143L rotate in the opposite directions, respectively, and the rack gear 153R The rack gear 153 </ b> L moves to the left along the main body 120 and moves to the right along the main body 120. That is, the moving parts 150R and 150L move in the direction toward the pivot 133. Here, since the right pinion gear 143R and the left pinion gear 143L, the intermediate gear GE1 and the intermediate gear GE2 have the same pitch and the same pitch circle, and the rack gear 153R and the rack gear 153L have the same pitch, the rack gear 153R and the rack gear 153L. The amount of movement is the same. Therefore, the moving part 150R and the moving part 150L are provided so as to be symmetrically movable in the horizontal direction about the pivot 133 along the main body part 120.

  The intermediate gears GE1 and GE2 may not be provided. The left pinion gear 143L is disposed at a position where the intermediate gear GE1 is disposed, and the right pinion gear 143R and the left pinion gear 143L are engaged with each other. Even with such a configuration, the moving unit 150R and the moving unit 150L can be moved symmetrically in the horizontal direction about the pivot 133 along the main body 120 as described above.

  In the above description, when the main body portion is rotated, the grip portion provided in the main body portion is gripped and rotated. However, the main body portion may be rotated and is limited to this configuration. It is not a thing. For example, as shown in FIG. 9, the support unit may be provided with a rotating unit that rotates the main body through a gear, and the main body may be rotated by the rotating unit.

  The rotating means 70 uses a planetary gear mechanism, and includes a cylindrical base 71 provided in the main body 220, a sun gear 72 fixed on the outer peripheral surface of the upper end of the base 71, and the sun gear 72. Two planetary gears 73R, 73L meshing with the sun gear 72 on the outer periphery, an internal gear 74 meshing with the two planetary gears 73R, 73L, a rod-shaped arm portion 75 fixed to the outer peripheral portion of the internal gear, and an arm portion 75 It is comprised from the holding part 228 etc. which were provided in the edge part.

  A through hole 226 penetrating in the vertical direction is formed at the center of the top plate 221 of the main body 220. A cylindrical base 71 is connected to the center of the bottom plate 224 of the main body 220. The base 71 penetrates the through hole 226, and a sun gear 72 is fixed to the outer peripheral surface of the upper end of the base 71. Yes. A pivot shaft 233 is inserted into the base portion 71, the base portion 71 pivotally supports the pivot shaft 233, and the main body portion 220 is rotatable around the pivot shaft 233 in the horizontal direction. Two planetary gears 73 </ b> R and 73 </ b> L that mesh with the sun gear 72 on the outer periphery of the sun gear 72 are pivotally supported by a rotation shaft fixed to the bottom of the presser portion 231. The internal gear 74 that meshes with the two planetary gears 73R and 73L has a ring shape and has a gear on the inner peripheral surface, and the gear and the internal gear 74 are meshed with each other. One end of a rod-shaped arm portion 75 bent in an L shape is fixed to the outer peripheral portion of the internal gear 74, the other end of the arm portion 75 faces upward, and the end portion has an arm portion. A grip portion 28 that is rotatable with respect to 75 is provided.

  Note that the number of planetary gears is not limited to two, it is sufficient that there is at least one, and a plurality of planetary gears are preferable. By having a plurality of planetary gears, the meshing between the planetary gears and the internal gear can be strengthened. An adjustment member 241 having the same configuration as that of the adjustment member 41 described above is provided on the outer peripheral portion of the base 71 and is rotatable with respect to the base 71. Since the adjustment member 241 has the same configuration as the adjustment member 41 described above, the details are omitted.

  Next, the turning structure of the main body 220 by the turning means 70 will be described. With one hand, the pressing portion 231 is pressed from above, and the pivot 233 is pressed so as not to move. When the grip 228 is gripped with the other hand and pivoted about the pivot 233, the internal gear 74 pivots about the pivot 233. When the internal gear 74 is rotated, the two planetary gears 73R and 73L meshing with the internal gear 74 are rotated around the rotation shaft fixed to the bottom of the presser portion 231. As the two planetary gears 73R and 73L rotate, the sun gear 72 that meshes with the planetary gear 73 rotates about the pivot 233 as a rotation center. Since the sun gear 72 is fixed to the base 71, and the base 71 is connected to the bottom plate 224 of the main body 220, the main gear 220 rotates around the pivot 233 as the sun gear 72 rotates. Move. Therefore, by rotating the grip 228 about the pivot 233, the main body 220 rotates about the pivot 233.

  Since the main body 220 is rotated via the sun gear 72, the planetary gears 73R and 73L, and the internal gear 74, the appropriate rotation of the main body 220 is determined by the amount of rotation of the grip 228 by appropriately designing the respective gear ratios. You can increase the amount of movement. For example, the gear ratio of the sun gear 72, the planetary gears 73R and 73L, and the internal gear 74 is designed so that the ratio of the input (the amount of rotation of the internal gear) and the output (the amount of rotation of the sun gear) is 1: 2. In this case, the gripping portion 228 can be rotated by a quarter of a rotation with the pivot 233 as a rotation center, so that the main body 220 can be rotated by a half with the rotation of the pivot 233. Since the object can be cut into a circular shape, the cutting operation becomes easy and the cutting operation time can be shortened. In addition, the main body 220 can be rotated with a small force by appropriately designing each gear ratio so as to have a reverse relationship to the above. In addition, the structure of the rotation means 70 should just be what rotates a main-body part via a gear, and is not limited to the above-mentioned structure.

  1 to 7, the main body 20 is made of stainless steel, the pivot 33, the adjustment member 41, the fixing part 44, the blade parts 51 </ b> R and 51 </ b> L, and the moving part main bodies 52 </ b> R and 52 </ b> L are made of iron. The first mounting part 35 and the second mounting part 36 use a circle cutter 10 formed of a rubber sheet. A corrugated cardboard in which a through hole having a thickness of 5 mm and a diameter of 150 mm was formed was an object to be cut, and the corrugated board was cut into a circular shape having a diameter of 700 mm concentric with the through hole by the method described above. Here, the size of the circle cutter 10 is that the length of the long side of the main body 20 is 1000 mm, the length of the short side is 60 mm, the height is 20 mm, the diameter of the first mounting portion 35 is 300 mm, the thickness is 5 mm, The diameter of the 2nd mounting part 36 is 150 mm, and thickness is 5 mm. As a result, the corrugated cardboard could be easily cut into a circular shape having a diameter of 700 mm that is concentric with the through hole.

DESCRIPTION OF SYMBOLS 10 Circle cutter 20,120,220 Main body part 30 Support part 31,231 Press part 32 Base part 33,133,233 Axis 35 1st mounting part 36 2nd mounting part 44,144 Fixing part 50R, 50L, 150R, 150L Moving part 51R, 51L, 151R, 151L Blade part 70 Rotating means SC scale

Claims (3)

In a circle cutter that cuts a flat cutting object into a circular shape,
The circle cutter includes a main body part,
A support portion that supports the main body portion so as to be rotatable about a vertical axis;
Two moving parts provided on the main body part so as to be symmetrically movable in the horizontal direction about the vertical axis along the main body part;
It consists of a fixing part that fixes the moving part to the main body part,
The support portion includes a presser portion located above the main body portion,
A pedestal located below the main body,
A pivot that pivotally supports the main body,
The said moving part is provided with the blade part which cut | disconnects the said cutting target object, The circle cutter characterized by the above-mentioned.   The circle cutter according to claim 1, wherein the support portion is provided with a rotating means for rotating the main body via a gear.   The circle cutter according to claim 1, wherein the main body includes a scale.

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