CN204450659U - circular cutter - Google Patents

Abstract

A circular cutter comprises a rotating unit, a distance adjusting unit, a cutting unit and a positioning unit, wherein the rotating unit rotates on a rotating shaft, the distance adjusting unit is displaceably arranged on the rotating unit and has a tool placement groove, the cutting unit is assembled in the tool placement groove, and one end protrudes from the bottom surface of the rotating unit, and the displacement of the distance adjusting unit will make the cutting unit move away from or close to the rotating shaft, and the positioning unit is located on the rotating shaft and is assembled with the rotating unit and the distance adjusting unit, so that the distance adjusting unit is positioned on the rotating unit at a specific position. Thus, pressing down the positioning unit can make the rotating unit move away from the surface to be cut by a height so that the cutting unit can cut around the rotating shaft, and pulling up the positioning unit can make the distance adjusting unit move relative to the rotating unit to change the cutting radius.

Description

circular cutter

technical field

The utility model relates to a cutter, in particular to a circular cutter.

Background technique

Generally, the method of circular cutting on paper is mostly to first use a compass or a circular template to draw the desired circle line on the surface of the paper, and then use a utility knife or scissors to cut along the circle line, and this method is not only labor-intensive Time-consuming and not easy to cut out the true roundness of the circle.

Due to the above-mentioned shortcomings, as China Taiwan Patent No. M433281 discloses a cutter, which includes a turntable and a cutting knife, the turntable is provided with a plurality of perforations, and the cutting knife group is arranged in the perforations to rotate the turntable to cut the circle. However, this method has the following problems in actual operation: first, the force application point of the cutter is at the center of the turntable, and the force force distance is the distance from the hole to the center of the turntable, so if you want to cut a circle with a smaller radius, It will be difficult for the user to apply force due to too small a force distance; second, the perforation depth of the turntable is short and shallow, so the user is likely to cause the problem of cutting knife detachment due to improper force application, which is dangerous; third, the cutting knife and perforation There is no precise fit between them, so the cutting knife is prone to shift during the cutting action, which will affect the accuracy and smoothness of the circle size.

Utility model content

The main purpose of the present utility model is to provide a circular cutter, which not only improves the problem of difficult application of cutting force, but also prevents the blade from detaching, so as to reduce the risk of operation; moreover, the circular cutting tool of the present utility model The structure is stable and easy to adjust, so the blade is not easy to shift during the cutting process, which will make the cut circle more round and more accurate in size.

In order to achieve the above purpose, a circular cutter of the present invention is placed above a surface to be cut and rotates on a rotating shaft to cut paper, which includes a rotating unit, a distance adjusting unit, a cutting unit and a positioning unit. Wherein the rotating unit has a receiving seat and an outer ring portion extending upward from the receiving seat for holding by the hand, the distance adjustment unit is displaceably arranged on the receiving seat, and has a tool placement slot, the displacement of the distance adjustment unit will make the distance between the cutter placement groove relative to the rotation axis become farther or closer, the cutting unit is assembled in the cutter placement groove, and one end protrudes from the bottom surface of the rotation unit, the positioning unit Located on the rotating shaft and combining the rotating unit and the distance adjustment unit, the distance adjustment unit is positioned on the rotation unit at a specific position. When the positioning unit is pressed down, the rotation unit will be away from the surface to be cut by one height; when the positioning unit is pulled upwards, the distance-adjustable unit will be able to move on the receiving seat.

More preferably, the receiving seat is provided with a slide rail spanning the rotating shaft, and the outer ring part is divided into two; the distance adjustment unit is provided with a slide rail corresponding to the slide rail, and the slide rail is slid on on the rails.

More preferably, the receiving seat is provided with an upwardly extending fixed pipe, and the fixed pipe is located on the rotating shaft; the distance adjustment unit is provided with a chute parallel to the slideway; the positioning unit has a sleeve, a A shaft in the sleeve, a set of elastic parts set on the shaft, a pressing part located above the sleeve and a support part located below the sleeve, the sleeve sleeves the fixed pipe and is located in the chute Inside, the shaft rod is installed in the fixed pipe, and the two ends are respectively provided with the pressing piece and the support piece, one end of the elastic piece is against the sleeve, and the other end pushes up the pressing piece.

More preferably, a non-slip pad is provided on the side of the support member of the positioning unit facing the surface to be cut.

More preferably, the chute of the distance adjusting unit is provided with a row of teeth formed by a plurality of grooves; the sleeve of the positioning unit is provided with a row of teeth formed by a plurality of flanges on the opposite side of the row of teeth The latching part, each of the flanges is embedded in each of the grooves, when the pressing piece is pressed down, the receiving seat will be a distance away from the surface to be cut, and when the sleeve is pulled up, the latching part will be disengaged The row of teeth.

More preferably, the distance adjustment unit is provided with a length scale along the direction of the chute, and the length scale is extended from the tool placement groove to the direction of the rotation axis; the sleeve of the positioning unit is on the length scale A scale indicator is provided on the opposite side of the body for judging the distance of the cutting unit relative to the rotation axis.

More preferably, the distance adjusting unit has a limiter, and a fixing part is provided adjacent to the knife placement groove, and the limiter is assembled on the fixing part and fixedly connected to the cutting unit.

More preferably, the cutter placement groove extends an embedding part in the horizontal direction; the cutting unit has a knife seat, a blade and a protective cover, the knife seat is provided with a pair of slots corresponding to the embedding part, and the card slot is The blade is fixed on the embedded part, and the blade is fixed under the knife seat, and the protective cover is installed on the knife seat and covers the blade.

More preferably, the bottom surface of the receiving seat of the rotating unit is provided with a knife accommodating groove, and a hook is provided in the knife accommodating groove; the knife seat of the cutting unit is provided with a pair of hook grooves corresponding to the hook, for the hook It is used for ticking cards.

More preferably, the circular cutter is placed above a surface to be cut and rotates according to a rotating shaft to cut paper, including the rotating unit, the distance adjustment unit, the cutting unit, the positioning unit, the rotating unit It has a receiving seat and an outer ring portion extending upward from the receiving seat for holding by the hand. The receiving seat is provided with a slide rail that crosses the outer ring portion and a sliding rail that is located on the rotating shaft and extends upward. The fixed pipe fitting; the distance adjustment unit is provided with a tool placement groove and a slideway corresponding to the slide rail, the slideway is displaceably arranged on the slide rail, and the displacement of the distance adjustment unit will make the tool placement groove relatively The distance between the rotating shaft is far away from or close to; the cutting unit is set in the tool placement groove, and one end protrudes from the bottom surface of the rotating unit; the positioning unit is located on the rotating shaft and has a sleeve, a shaft, and an elastic A piece, a pressing piece and a supporting piece, the shaft is located in the sleeve, the elastic piece covers the shaft, the pressing piece is located above the sleeve, and the support is located below the sleeve, the sleeve The sleeve is sleeved on the fixed pipe and located in the chute, the shaft is passed through the fixed pipe and the two ends are respectively provided with the pressing part and the supporting part, one end of the elastic part is against the sleeve, and the other end is upward Push the pressing piece, when the pressing piece is pressed down, the receiving seat will be away from the surface to be cut by a height; when the sleeve is pulled up, the distance adjustment unit will be able to move on the receiving seat.

More preferably, the distance adjustment unit is provided with a chute parallel to the slideway, and the chute is provided with a row of teeth formed by a plurality of grooves; the sleeve of the positioning unit is positioned on the row of teeth On the opposite side, there is a locking part formed by a plurality of flanges. Each of the flanges is embedded in each of the grooves. When the pressing part is pressed down, the receiving seat will be away from the surface to be cut by a distance. When pulled up When the sleeve is lifted, the engaging portion will disengage from the row of teeth.

More preferably, a non-slip pad is provided on a side of the support member of the positioning unit facing the surface to be cut.

More preferably, the distance adjustment unit is provided with a length scale along the direction of the chute, and the length scale is extended from the tool placement groove to the direction of the rotation axis; the sleeve of the positioning unit is on the length scale A scale indicator is provided on the opposite side of the body for judging the distance of the cutting unit relative to the rotation axis.

More preferably, the distance adjusting unit has a limiter, and a fixing part is provided adjacent to the knife placement groove, and the limiter is assembled on the fixing part and fixedly connected to the cutting unit.

More preferably, the cutter placement groove extends an embedding part in the horizontal direction; the cutting unit has a knife seat, a blade and a protective cover, the knife seat is provided with a pair of slots corresponding to the embedding part, and the card slot is The blade is fixed on the embedded part, and the blade is fixed under the knife seat, and the protective cover is installed on the knife seat and covers the blade.

More preferably, the bottom surface of the receiving seat of the rotating unit is provided with a knife accommodating groove, and a hook is provided in the knife accommodating groove; the knife seat of the cutting unit is provided with a pair of hook grooves corresponding to the hook, for the hook It is used for ticking cards.

More preferably, the bottom surface of the receiving seat of the rotating unit is provided with a cutter accommodating groove for accommodating the unused cutting unit.

More preferably, an anti-slip notch is provided on the outer surface of the outer ring portion of the rotating unit.

Therefore, a circular cutter of the present invention not only solves the problem of difficult application of cutting force through the design of the outer ring, but also has a more stable assembly structure to prevent the blade from detaching, so as to reduce the risk of operation; moreover , The circular cutting tool of the utility model has a stable and conveniently adjustable structure, so the blade is not easy to deviate during the cutting process, and this will make the cut circle smoother and more accurate in size.

Description of drawings

In order to enable the examiner to further understand the structure, features and purpose of the utility model, the following are several embodiments of the utility model, which are described in detail with the accompanying drawings, and at the same time allow those familiar with the technical field to implement them in detail. What is described below is only an embodiment provided in order to illustrate the technical content and features of the present utility model. Those who have general knowledge in the field of the present utility model, after understanding the technical content and features of the present utility model, will use Without violating the spirit of the present utility model, all kinds of simple modifications, replacements or reductions in components shall fall within the intended protection category of the present utility model, among which:

Fig. 1 is a perspective view of a circular cutter in a preferred embodiment of the present invention.

FIG. 2 is an exploded view of the circular cutter of the preferred embodiment of the present invention, mainly showing the constituent elements of each unit and their corresponding positions.

FIG. 3 is a cross-sectional view along the section line A-A of FIG. 1 , mainly showing the corresponding relationship of each unit after assembly.

FIG. 4 is a cross-sectional view along the section line B-B in FIG. 1 , mainly showing the corresponding relationship of each unit after assembly.

Fig. 5 is a partially enlarged view of the circular cutter of the preferred embodiment of the present invention, mainly showing the inside of the cutter accommodating groove on the bottom surface of the receiving seat.

Fig. 6 is a cross-sectional view of the circular cutter according to the preferred embodiment of the present invention, mainly showing that the user pulls up the sleeve of the positioning unit, so that the distance adjusting unit is no longer restricted by the sleeve and can be displaced on the rotating unit.

Fig. 7 is a perspective view of the circular cutter of the preferred embodiment of the present invention, mainly showing the state that the cutting unit on the distance adjusting unit is away from the rotation axis.

Fig. 8 is a top view of the circular cutter according to the preferred embodiment of the present invention, mainly showing how the cutting unit on the distance adjustment unit is away from or close to the rotation axis.

Fig. 9 is a cross-sectional view of the circular cutter in the preferred embodiment of the present invention, mainly showing that the user presses down the pressing part of the positioning unit, so that the supporting part protrudes from the receiving seat of the rotating unit and is slightly flush with the blade of the cutting unit, In order to rotate the outer ring part to cut the paper.

Detailed ways

In order to describe in detail the structure, features and effects of the present utility model, a first preferred embodiment is hereby enumerated and described as follows in conjunction with the following drawings, wherein:

Please refer to Fig. 1 to Fig. 2, a kind of circular cutter 10 is placed on the top of a surface to be cut and rotates according to a rotation axis C to cut paper, including a rotating unit 20, a distance adjustment unit 30, a The cutting unit 40 and a positioning unit 50 .

The rotating unit 20 has a receiving base 21 and an outer ring portion 23 extending upward from the receiving base 21 for holding by hands. The receiving base 21 is provided with a slide rail 211 and a fixed pipe 213, The slide rail 211 straddles the rotation axis C and divides the outer ring portion 23 into two, so that it is convenient for the user to grasp and rotate with fingers, and the fixed pipe 213 extends upward from the bottom surface of the receiving seat 21 , and The fixed pipe 213 is located on the rotation axis C. In addition, in order to allow the user to rotate the outer ring with less effort, an anti-slip notch 231 is provided on the outer surface of the outer ring 23 so that the fingers can rotate the outer ring. The lateral action force when the part 23 is applied to the anti-slip notch 231, and the problem of slippage will not occur.

The distance adjustment unit 30 is arranged on the receiving seat 21 in a laterally displaceable manner, and has a tool placement groove 31 for the cutting unit 40 to be assembled, a slideway 33 corresponding to the slide rail 211, and a slideway 33 corresponding to the slide rail 211. The chute 35 of the road 33 parallel to each other, a length scale 36 along the direction of the chute 35, a stopper 37 and a fixing part 39, as shown in Fig. 3 and Fig. 4, wherein the displacement of the distance adjusting unit 30 will be To make the distance between the tool placement groove 31 and the rotation axis C farther or closer, the slideway 33 is slidably arranged on the slideway 211, and the inner wall surface of the slideway 35 is provided with a The tooth row portion 351 is formed by a plurality of grooves 352 arranged. The fixing part 39 is two circular holes and the positions provided are respectively adjacent to the both sides of the tool placement groove 31. The stopper 37 is provided with two protrusions corresponding to each of the circular holes on the opposite side of the fixing part 39, through which each The boss is engaged in each of the round holes, so that the limiting member 37 is assembled on the fixing part 39 and the cutting unit 40 is firmly arranged in the tool placement groove 31. In addition, in order to increase the cutting unit 40 For the stability of the installation, in the present invention, an embedded part 311 is extended in the horizontal direction from the cutter resting groove 31 . Please refer to the following description for the structure corresponding to the embedded part 311 .

The cutting unit 40 is assembled in the knife placement groove 31, and one end protrudes from the bottom surface of the rotating unit 20. The cutting unit 40 has a knife seat 41, a blade 43 and a protective cover 45. The knife seat 41 is provided with a pair of The card slot 411 of the embedded part 311 should be fixed, and the card slot 411 is fixed on the embedded part 311, the blade 43 is fixed under the knife seat 41, the protective cover 45 is installed on the knife seat 41 and covers Cover the blade 43. Therefore, when the user wants to cut the paper, the protective cover 45 must be taken off first, and the protective cover 45 is put back into the knife holder 41 after use, so that it can be avoided when the blade is not in use. In the state of the circular cutter 10, the blade 43 of the circular cutter 10 scratches objects or accidentally cuts people.

The positioning unit 50, as shown in Figure 2, the positioning unit 50 is located on the rotation axis C and is assembled with the rotating unit 20 and the distance adjustment unit 30, through the locking of the positioning unit 50 and the distance adjustment unit 30 or In the separated state, the distance adjustment unit 30 can be positioned on the rotating unit 20 at a specific position. When the positioning unit 50 is pressed down, the rotating unit 20 will be away from the plane R to be cut by a height L; when the positioning unit is pulled up When the unit 50 is used, the distance adjustment unit 30 will be able to displace on the receiving seat 21. To describe in detail, the positioning unit 50 has a sleeve 51, a shaft 53 located in the sleeve 51, and a set of the shaft. The elastic member 55 of the rod 53, a pressing member 57 located above the sleeve 51, and a support member 59 located below the sleeve 51, the sleeve 51 sleeves the fixed pipe member 213 and is located in the sliding groove 35, and The sleeve 51 is provided with a scale indicator 513 on the opposite side of the length scale 36, the shaft 53 is passed through the fixed pipe 213 and the pressing member 57 and the supporting member 59 are respectively provided at both ends, and the elastic member 55 One end leans against the sleeve 51, and the other end pushes up the pressing member 57. In addition, in order to prevent the blade 43 from pulling the paper in the process of cutting the paper, the utility model causes the paper to slip, resulting in a precise circular shape. The problem of poor degree and smoothness, so a non-slip pad 591 is provided on the side of the support member 59 facing the surface to be cut, and the anti-slip pad 591 is preferably elastic rubber. The opposite side of the part 351 is provided with a locking part 511 formed by a plurality of flanges 512, and each of the flanges 512 is inserted into each of the concave grooves 352, so that the distance adjustment unit 30 will be adjusted by each of the concave grooves. 352 and each of the flanges 512 cannot move freely on the receiving seat 21 of the rotating unit 20 . It is also worth mentioning that, as shown in FIG. 5 , the bottom surface of the receiving seat 21 of the rotating unit 20 is provided with a cutter accommodating groove 215 for accommodating the spare cutting unit 40 . A hook portion 216 is disposed in the slot 215 , and the knife seat 41 of the cutting unit 40 is provided with a pair of hook grooves 413 corresponding to the hook portion 216 for the hook portion 214 to hook.

For the operation of adjusting the circular cutting radius, please refer to Fig. 3, Fig. 6 to Fig. 8, when the circular cutter 10 is not in use, a gap is formed between the sleeve 51 and the pressing member 57. Normal gap D1, when the user wants to adjust the distance between the cutting unit 40 and the rotation axis C (that is, to adjust the radius of the circle), the thumb of one of the user's hands rests on the pressing member 57, and the index finger and middle finger respectively Hook on the left and right sides of the sleeve 51 and then pull it up, so that the sleeve 51 will be pulled up, and the gap D2 between the sleeve 51 and the pressing member 57 will be shortened , and the locking part 511 will be disengaged from the row of teeth 351, and then the user can slide the distance adjustment unit 30 with the other hand to change the radius of the cutting circle, and finally only need to release it after confirming the distance The sleeve 51 , the sleeve 51 will make the flange 512 of the engaging portion 511 fit back into the grooves 352 of the row of teeth 351 again due to the restoring force of the elastic member 55 .

See also shown in Figure 9, when the user completes the aforementioned adjustment and intends to perform circular cutting, the user first places the circular cutter 10 on the paper to be cut, and then the user moves one of the hands to Press down the pressing member 57, so that the supporting member 59 is driven by the shaft 53 to protrude toward the direction of the paper and lean against the paper with the anti-slip pad 591. At this time, the receiving seat 21 is It will be away from the surface R to be cut by a height L (that is, the receiving seat 21 is slightly empty), and then the user's other hand is grasped on the outer ring part 23, and rotates according to the direction of the blade 43 to perform The action of a circular cut.

In addition, in order for the user to know the distance between the blade 43 of the cutting unit 40 and the rotation axis C clearly and quickly, the distance adjustment unit 30 is provided with a length scale 36 along the direction of the chute 35 , and the The length scale 36 is extended from the tool placement groove 31 to the direction of the rotation axis C, and then passed through the sleeve 51 of the positioning unit 50 and the scale index 513 on the opposite side of the length scale 36, so that the user can use The operator can easily judge the distance of the cutting unit 40 relative to the rotation axis C from the position of the length scale 36 indicated by the scale indicator 513, so as to improve its convenience.

To sum up, the circular cutter 10 of the present invention not only solves the problem of difficulty in cutting and applying force through the design of the outer ring portion 23, but also because the tool placement groove 31 of the distance adjustment unit 30 and the stopper 37 The cutting unit 40 can be firmly assembled therein, and this can prevent the blade 43 from falling off during the cutting process, so as to reduce the risk of operation, so that the blade 43 is not easy to be deviated during the cutting process, In order to make the cut circle smoother and more accurate in size; moreover, the sliding design of the rotating unit 20 of the circular cutter 10 and the distance adjustment unit 30 matches the positioning of the distance adjustment unit 30 and the positioning unit 50 design, which can facilitate the user to adjust the radius of the cutting circle.

The constituent elements disclosed in the above-disclosed embodiments of the present invention are only examples and are not intended to limit the scope of the present application. Substitution or changes of other equivalent elements should also be covered by the scope of the claims of the present application.

Claims (18)

1. A circular cutter, placed above a surface to be cut and cut paper according to a rotation axis, is characterized in that it includes: A rotating unit has a receiving seat and an outer ring portion extending upward from the receiving seat for holding by hands; A distance-adjusting unit, displaceably arranged on the receiving seat, and having a tool placement groove, the displacement of the distance-adjusting unit will make the distance between the tool placement groove relative to the rotation axis farther or closer; A cutting unit is assembled in the cutter placement groove, and one end protrudes from the bottom surface of the rotating unit; and A positioning unit is located on the rotating shaft and the rotating unit and the distance adjustment unit are assembled so that the distance adjustment unit can be positioned on the rotation unit at a specific position. When the positioning unit is pressed down, the rotation unit will be away from The surface to be cut has a height; when the positioning unit is pulled upward, the distance adjusting unit can move on the receiving seat. 2. The circular cutter as claimed in claim 1, wherein the receiving seat is provided with a slide rail spanning the rotating shaft, and the outer ring part is divided into two; the distance adjustment unit is provided There is a slideway corresponding to the slideway, and the slideway is slidably arranged on the slideway. 3. The circular cutter according to claim 2, wherein the receiving seat is provided with a fixed pipe extending upwards, and the fixed pipe is located on the rotation axis; the distance adjustment unit is provided with a The chute; the positioning unit has a sleeve, a shaft located in the sleeve, a set of elastic parts set on the shaft, a pressing piece located above the sleeve and a support located below the sleeve part, the sleeve sleeves the fixed pipe and is located in the chute, the shaft passes through the fixed pipe and the two ends are respectively provided with the pressing part and the supporting part, and one end of the elastic part is against the sleeve , and the other end pushes up the pressing piece. 4. The circular cutter according to claim 3, wherein a non-slip pad is provided on a side of the support member of the positioning unit facing the surface to be cut. 5. The circular cutter according to claim 3, wherein the chute of the distance adjusting unit is provided with a row of teeth formed by a plurality of grooves; the sleeve of the positioning unit is positioned in the row The opposite side of the tooth portion is provided with a locking portion composed of a plurality of flanges, each of which engages with each of the grooves, when the pressing piece is pressed down, the receiving seat will be a distance away from the surface to be cut, When the sleeve is pulled up, the engaging portion will disengage from the row of teeth. 6. The circular cutter as claimed in claim 3, wherein the distance adjustment unit is provided with a length scale along the direction of the chute, and the length scale starts from the cutter placement groove toward the rotation axis extending in the direction; the sleeve of the positioning unit is provided with a scale indicator on the opposite side of the length scale for judging the distance of the cutting unit relative to the rotation axis. 7. The circular cutter according to claim 1, wherein the distance adjusting unit has a stopper, and a fixing part is provided adjacent to the knife placement groove, and the stopper is assembled on the fixing part. part and fix the cutting unit. 8. The circular cutter as claimed in claim 7, wherein the knife seating groove extends horizontally with an embedded part; the cutting unit has a knife seat, a blade and a protective cover, and the knife seat is provided with There is a pair of card slots corresponding to the engaging part, and the card slots are fixed on the engaging part, the blade is fixed under the knife seat, and the protective cover is installed on the knife seat and covers the blade. 9. The circular cutter according to claim 8, wherein the bottom surface of the receiving seat of the rotating unit is provided with a cutter accommodating groove, and a hook is provided in the cutter accommodating groove; the cutter of the cutting unit The seat is provided with a pair of hooking grooves corresponding to the hooking portion for the hooking of the hooking portion. 10. A circular cutter, which is placed above a surface to be cut and cuts paper according to a rotation axis, is characterized in that it includes: A rotating unit has a receiving seat and an outer ring part extending upward from the receiving seat for holding by hands. The receiving seat is provided with a slide rail crossing the outer ring part and a and upwardly extending fixed pipe fittings; A distance adjustment unit is provided with a tool placement groove, a slideway corresponding to the slide rail, and a slide groove parallel to the slideway, the slideway is displaceably arranged on the slide rail, and the distance adjustment unit The displacement will make the distance between the tool seating groove and the rotation axis farther or closer; A cutting unit is assembled in the cutter placement groove, and one end protrudes from the bottom surface of the rotating unit; and A positioning unit is located on the rotating shaft and has a sleeve, a shaft, an elastic member, a pressing member and a support member, the shaft is located in the sleeve, the elastic member sleeves the shaft, and the pressing The part is located above the sleeve, and the supporting part is located below the sleeve. The sleeve sleeves the fixed pipe and is located in the chute. The shaft passes through the fixed pipe and has two ends respectively The pressing part and the supporting part, one end of the elastic part is against the sleeve, and the other end pushes up the pressing part, when the pressing part is pressed down, the receiving seat will be far away from the surface to be cut by a height; When the sleeve is used, the distance adjustment unit can move on the receiving seat. 11. The circular cutter according to claim 10, wherein the chute of the distance adjusting unit is provided with a row of teeth formed by a plurality of grooves; the sleeve of the positioning unit is located in the row The opposite side of the tooth portion is provided with a locking portion composed of a plurality of flanges, each of which engages with each of the grooves, and when the pressing member is pressed down, the receiving seat will be a distance away from the surface to be cut, When the sleeve is pulled up, the engaging portion will disengage from the row of teeth. 12 . The circular cutter according to claim 10 , wherein a non-slip pad is provided on a side of the support member of the positioning unit facing the surface to be cut. 13 . 13. The circular cutter as claimed in claim 10, wherein the distance adjustment unit is provided with a length scale along the direction of the chute, and the length scale starts from the tool placement groove toward the rotation axis extending in the direction; the sleeve of the positioning unit is provided with a scale indicator on the opposite side of the length scale for judging the distance of the cutting unit relative to the rotation axis. 14. The circular cutter according to claim 10, wherein the distance adjusting unit has a stopper, and a fixing part is provided adjacent to the knife placement groove, and the stopper is assembled on the fixing part. part and fix the cutting unit. 15. The circular cutter as claimed in claim 10, wherein the cutter placement groove extends horizontally with an embedded part; the cutting unit has a knife seat, a blade and a protective cover, and the knife seat is provided with There is a pair of card slots corresponding to the engaging part, and the card slots are fixed on the engaging part, the blade is fixed under the knife seat, and the protective cover is installed on the knife seat and covers the blade. 16. The circular cutter according to claim 15, wherein the bottom surface of the receiving seat of the rotating unit is provided with a cutter accommodating groove, and a hook is provided in the cutter accommodating groove; the cutter of the cutting unit The seat is provided with a pair of hooking grooves corresponding to the hooking portion for the hooking of the hooking portion. 17. The circular cutter as claimed in any one of claims 1 or 12, wherein the bottom surface of the receiving seat of the rotating unit is provided with a cutter accommodating groove for accommodating the unused cutting unit use. 18. The circular cutter according to any one of claims 1 or 12, wherein an anti-slip notch is provided on the outer surface of the outer ring portion of the rotating unit.