CN108156952B

CN108156952B - Fruit and vegetable picking device

Info

Publication number: CN108156952B
Application number: CN201810090177.3A
Authority: CN
Inventors: 王星; 张世丰; 陈醒僚
Original assignee: Northeastern University China
Current assignee: Northeastern University China
Priority date: 2018-01-30
Filing date: 2018-01-30
Publication date: 2020-01-10
Anticipated expiration: 2038-01-30
Also published as: CN108156952A

Abstract

The invention relates to a fruit and vegetable picker which comprises a V-shaped shell and a saw blade, wherein the V-shaped shell comprises a shell body with an accommodating cavity, and a first limiting piece and a second limiting piece which are fixedly connected with the shell body at the same time. The saw blade is arranged in the accommodating cavity and can rotate in the accommodating cavity, and the shell body is provided with a cutting opening which enables partial saw teeth of the saw blade to be exposed out of the accommodating cavity and is used for cutting fruit stalks of fruits and vegetables. The first limiting piece is arranged on the outer side of the cutting opening, and forms a cutting groove with a V-shaped opening with the shell body. The second limiting piece and the first limiting piece form an introduction groove with a V-shaped opening, the opening direction of the V-shaped opening of the cutting groove is consistent with the opening direction of the V-shaped opening of the introduction groove, and the opening angle of the V-shaped opening of the introduction groove is larger than or equal to the opening angle of the V-shaped opening of the cutting groove. The fruit and vegetable picker is simple in structure, capable of picking fruits and vegetables accurately and quickly, low in labor intensity, high in efficiency and capable of ensuring the quality of finished products of fruits and vegetables.

Description

Fruit and vegetable picking device

Technical Field

The invention belongs to the technical field of agricultural machinery, and particularly relates to a fruit and vegetable picker.

Background

At present, agricultural production is widely operated in various ways, and economic crops, particularly fruits and vegetables are massively produced and put on the market, so that dietary varieties of people are enriched, and the life quality of people is improved.

Taking oranges as an example, the planting area of the oranges in 2011 is 873 hectare, the yield reaches 1.31 hundred million tons, and the international annual trade amount of the oranges and finished products thereof is 232 hundred million dollars, which is the third international trade agricultural product next to wheat and corn. In China, oranges are mainly eaten fresh, and the processing amount is only 10%. However, in most areas of China, the orange picking process basically mainly utilizes labor resources, the labor intensity is high, and the working price accounts for a large proportion of the production cost. In recent years, the production cost of the oranges in China is continuously increased, the export competition pressure is continuously increased, the export comparative advantages are gradually lost, no prominent local dominant varieties exist, the maturity stages of the oranges in all regions are basically consistent, intensive production is urgently needed, and the mechanization level is improved.

In order to facilitate picking of fruits and vegetables, several types of fruit picking tools have been developed by various research institutes at home and abroad. Some large-scale mechanical picking devices have high picking efficiency, but have complex operation and high cost, and have great damage to fruits and vegetables. Some simple fruit and vegetable picking tools, such as a telescopic fruit picker (CN204888023U), are flexible and convenient to operate, but have technical disadvantages, which are mainly shown in that: with conventional scissors-type cutters, it is not easy to align and cut the pedicles. When picking fruit, the V-shaped cutting edge of the scissors is aligned with the pedicel, and then the scissors are closed to cut the pedicel, but: the higher the fruit tree is, the higher the fruit bearing position is, and the more difficult the V-shaped cutting edge is aligned with the fruit base; moreover, the pedicles of some fruits are very tough, and the pedicles are easy to slide along the scissors blades when being cut, so that the pedicles are difficult to cut and the efficiency is low.

Disclosure of Invention

Technical problem to be solved

In order to solve the problems in the prior art, the invention provides the fruit and vegetable picker which is simple in structure, capable of picking accurately and quickly, low in labor intensity, high in efficiency and capable of ensuring the quality of finished products of fruits and vegetables.

(II) technical scheme

In order to achieve the purpose, the invention adopts the main technical scheme that:

the invention provides a fruit and vegetable picker, which comprises a V-shaped shell and a saw blade; the V-shaped shell comprises a shell body with an accommodating cavity, and a first limiting piece and a second limiting piece which are fixedly connected with the shell body at the same time; the saw blade is arranged in the accommodating cavity and can rotate in the accommodating cavity, and the shell body is provided with a cutting opening which enables partial saw teeth of the saw blade to be exposed out of the accommodating cavity and is used for cutting fruit stalks of fruits and vegetables; the first limiting piece is arranged on the outer side of the cutting opening and forms a cutting groove with a V-shaped opening with the shell body; the second limiting piece and the first limiting piece form an introduction groove with a V-shaped opening, the opening direction of the V-shaped opening of the cutting groove is consistent with the opening direction of the V-shaped opening of the introduction groove, and the opening angle of the V-shaped opening of the introduction groove is larger than or equal to the opening angle of the V-shaped opening of the cutting groove.

According to the invention, the saw teeth are in the shape of oblique teeth, and the inclination direction of the saw teeth and the rotation direction of the saw blade are opposite to the opening direction of the V-shaped opening of the cutting groove.

According to the invention, the shell body is disc-shaped, the shell body is also provided with the mounting opening for mounting the saw blade, and the chord length of the mounting opening is larger than the diameter of the saw blade.

According to the invention, the second limiting piece comprises two inclined edges, one end of each inclined edge is fixedly connected, and the other end of each inclined edge is fixedly connected with the shell body.

According to the invention, the surface of at least the first limiting member comprises an elastic buffer material.

According to the invention, the device also comprises a driving device and a handheld rod; the bottom of the shell body is fixedly connected with the first end of the handheld rod, and the center of the saw blade is fixedly connected with the rotating output end of the driving device and is driven to rotate by the driving device.

According to the invention, the driving device is a motor, an output shaft of the motor penetrates out of the top of the shell body from the bottom of the shell body, the bottom of the shell body is rotatably connected with the output shaft through a fixing piece, and the top of the shell body is fixedly connected with the output shaft and the saw blade through a gasket.

According to the invention, the motor also comprises a power supply device and a switch which is simultaneously connected with the power supply device and the motor; the second end of the hand-held rod is connected with a handle, the switch is a point-control double-pole double-throw switch and is arranged on the handle, and the power supply device is internally arranged in the hand-held rod or is externally connected with an external power supply.

According to the invention, the distance between the handle and the V-shaped housing is adjustable.

According to the invention, the fruit and vegetable collecting device is also arranged at the first end of the handheld rod; the fruit and vegetable collecting device comprises an upward collecting opening which is correspondingly arranged below the cutting groove.

(III) advantageous effects

The invention has the beneficial effects that:

the first limiting piece and the second limiting piece in the V-shaped shell of the fruit and vegetable picker form a funnel shape, so that fruit stalks can be quickly and accurately guided into the cutting groove. Because the cutting groove is V-shaped, the fruit stalks can be effectively locked after being guided into the cutting groove, so that the fruit stalks are prevented from popping up, and the rotation of the saw blade arranged in the shell body is reused, so that the fruit stalks can be quickly and accurately cut. Therefore, the fruit and vegetable picker is simple in structure, can pick fruits and vegetables accurately and quickly, greatly reduces labor intensity and improves picking efficiency. Simultaneously because the sawtooth that exposes the holding chamber outside is located cuts the cut groove, the effective work area of sawtooth also limits to cutting the V type region in groove, therefore the sawtooth can not touch the place of cutting outside the groove region, in addition the setting of first locating part and second locating part, so can prevent that the sawtooth from touching the fruit vegetables and causing the damage, and then guaranteed the finished product quality of fruit vegetables.

Drawings

FIG. 1 is a schematic structural view of a fruit and vegetable picker provided in the following embodiments;

FIG. 2 is a perspective schematic view of the fruit and vegetable picker shown in FIG. 1;

FIG. 3 is a schematic top view of the fruit and vegetable picker shown in FIG. 1

Fig. 4 is a schematic view of the working state of the fruit and vegetable picker shown in fig. 1 when picking oranges.

[ description of reference ]

1: a V-shaped shell; 11: a housing body; 111: cutting an opening; 112: an installation opening; 12: a first limit piece; 13: a second limiting member; 2: a saw blade; 3: a drive device; 4: a hand-held wand; 5, a handle; 6: a switch; 7: fruit vegetables collection device.

Detailed Description

For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.

For convenience of description, the following examples will be described by taking orange picking as an example, but those skilled in the art will understand that the fruit and vegetable picker of the present invention is not limited to use in orange picking.

Referring to fig. 1 to 3, the present embodiment provides a fruit and vegetable picker, including a V-shaped housing 1 and a saw blade 2, where the V-shaped housing 1 includes a housing body 2 having a receiving cavity, a first limiting member 12 and a second limiting member 13. The first limiting member 12 and the second limiting member 13 are fixedly connected to the housing body 2.

The saw blade 2 is arranged in the accommodating cavity and can rotate in the accommodating cavity, and the shell body 2 is provided with a cutting opening 111 which enables part of saw teeth of the saw blade 2 to be exposed out of the accommodating cavity and is used for cutting fruit stalks of oranges. The first limiting member 12 is disposed outside the cutting opening 111, and forms a cutting groove with a V-shaped opening with the housing body 2. The second stopper 13 and the first stopper 12 form an introduction groove having a V-shaped opening, the opening direction of the V-shaped opening of the cutting groove coincides with the opening direction of the V-shaped opening of the introduction groove, and the opening angle of the V-shaped opening of the introduction groove is greater than or equal to the opening angle of the V-shaped opening of the cutting groove.

Specifically, referring to fig. 4, in operation, the leading-in groove is firstly aligned with the fruit stalks of oranges to be picked, then the V-shaped shell 1 is moved to lead the fruit stalks into the cutting groove, and the fruit stalks are quickly cut off by the sawteeth exposed out of the accommodating cavity in the cutting groove through the rotation of the saw blade 2. The leading-in groove and the cutting groove are integrally formed into a funnel shape, the leading-in groove is used for leading the fruit stalks into the cutting groove, and meanwhile, the arrangement of the first limiting piece 12 and the second limiting piece 13 prevents the fruit stalks from being ejected out in the cutting process. The V-shaped housing 1 described here does not mean that the overall shape of the housing is V-shaped. Meanwhile, only a part of the structure of the handheld rod 4 is shown in fig. 2 to 4, and the whole structure of the handheld rod 4 is shown in fig. 1.

In summary, the first limiting member 12 and the second limiting member 13 in the V-shaped housing 1 of the fruit and vegetable picker in the embodiment form a funnel shape, so that the fruit stalks can be quickly and accurately guided into the cutting groove. Because the cutting groove is the V type, can effectively lock the fruit stalk behind the leading-in cutting groove of fruit stalk and prevent popping out of fruit stalk, thereby it cuts to recycle the rotation of the saw bit 2 of built-in casing body 2 accurately fast. Therefore, the fruit and vegetable picking device in the embodiment has a simple structure, can accurately and quickly pick fruits, greatly reduces labor intensity and improves picking efficiency. Especially, the fruit (such as oranges, litchis and the like) with difficultly-fallen fruit stalks can be picked conveniently and quickly. Simultaneously because the sawtooth that exposes the holding chamber outside is located the cutting groove, the effective work area of sawtooth also limits to cutting the V type region of groove, therefore the sawtooth can not touch the place outside cutting the groove region, in addition first locating part 12 and second locating part 13's setting, so can prevent that the sawtooth from touching the orange and causing the damage, and then guaranteed the finished product quality of orange.

Further, the opening angle of the V-shaped opening of the introduction groove was 60 °, and the opening angle of the V-shaped opening of the cutting groove was 30 °.

Further, the saw teeth are of a skewed tooth shape, and the direction of inclination of the saw teeth, the direction of rotation of the saw blade 2 (i.e. counterclockwise as viewed in fig. 3) is opposite to the opening direction of the V-shaped opening of the cutting groove. Therefore, the saw teeth can clamp the fruit stalks in the cutting grooves, so that the fruit stalks can be cut off more quickly and accurately, and the fruit stalks are further prevented from popping up.

Further, the housing body 2 is disc-shaped, the housing body 2 is further provided with an installation opening 112 for installing the saw blade 2, and the chord length of the installation opening 112 is larger than the diameter of the saw blade 2. Specifically, the housing body 2 is formed by connecting two disks, a gap between the two disks forms the receiving cavity, and the cutting opening 111 is formed at the edge of the housing body 2 to expose a part of the saw teeth of the saw blade 2. A mounting opening 112 is formed at the other edge of the housing body 2, through which mounting opening 112 the saw blade 2 can be fitted into the receiving cavity. Since the saw blade 2 can generate sawdust (mainly stalk powder) during the cutting process of the stalks, the mounting opening 112 can discharge the sawdust in time so as to avoid blockage.

Further preferably, the chord length of the mounting opening 112 is 2-3 mm larger than the diameter of the saw blade 2, and the height of the gap between the two disks is 2-3 mm. Therefore, the saw blade 2 can be smoothly arranged in the accommodating cavity, and the protection effect of the shell body 2 on the saw blade 2 can be guaranteed, and the material is saved.

Further, the second limiting member 13 includes two oblique edges, and one end of the two oblique edges is fixedly connected, and the other end is respectively fixedly connected with the housing body 2. Two hypotenuses form a confined region with casing body 2 like this, can play better guide effect and improve the stability of structure to the fruit stalk. Further, the closed area that two hypotenuses and casing body 2 enclose is equipped with the bottom plate, further improves the stability of structure.

Further, at least the surface of the first limiting member 12 includes an elastic buffer material, such as rubber, plastic or silica gel, to protect the fruit peel from being damaged, thereby ensuring the quality of the fruit and vegetable finished product. Of course, the surface of the V-shaped housing 1 may be provided with an elastic buffer material, or the entire V-shaped housing 1 may be provided with an elastic buffer material having a certain rigidity.

Further, all the structures of the V-shaped shell 1 are formed by an integrated molding technology, and the V-shaped shell is simple and convenient. Of course, all the structures of the V-shaped shell 1 can be fixedly connected by welding.

Further, this fruit vegetables picker still includes drive arrangement 3 and handheld pole 4, and the first end fixed connection of the bottom of casing body 2 and handheld pole 4, the center of saw bit 2 and the rotatory output end fixed connection of drive arrangement 3 and by the drive arrangement 3 drive rotation. The handheld rod 4 is preferably of a hollow structure, so that the weight can be reduced, the cost is reduced, and meanwhile, the laying of lines is facilitated.

Further preferably, the driving device 3 is a motor, an output shaft of the motor penetrates through the top of the housing body 2 from the bottom of the housing body 2, the bottom of the housing body 2 is rotatably connected with the output shaft through a fixing member (for example, a bearing is sleeved on the output shaft, and the output shaft is rotatably connected with the fixing member through a bearing), and the top of the housing body 2 is simultaneously and fixedly connected with the output shaft and the saw blade 2 through a gasket. The electric drive is adopted, the operation is light and portable, the operation is simple and flexible, and the labor intensity is reduced. The fixing member for fixedly connecting the bottom of the housing body 2 to the first end of the hand lever 4 and the fixing member for rotatably connecting the bottom of the housing body 2 to the output shaft may be two separate members or may be integrally connected (for example, by welding or an integral molding technique, and all of the members shown in fig. 1 to 4 are formed by the integral molding technique). Further, the bottom and top referred to herein refer to the orientation shown in fig. 1.

Further, the rotating speed of the motor is 8000-12000 r/min, so that fruit stalks can be cut quickly in a short time, and the picking efficiency is improved. If the rotating speed of the motor is less than 8000r/min, the fruit stalks are easy to clamp the saw blade 2 to influence the normal work. If the rotating speed of the motor is more than 12000r/min, the motor is easy to overheat, and faults occur. Therefore, the rotating speed of the motor is selected to be 8000-12000 r/min, so that the normal work of the motor is guaranteed, and the fruit stalks can be quickly sawn off.

Further alternatively, the driving means 3 is a mechanical energy storage means and is connected to the actuating member. The rotary output end of the mechanical energy storage device is fixedly connected with the center of the saw blade 2, the actuating piece is installed on the handheld rod 4 and is connected with the mechanical energy storage device inside the handheld rod 4 through a pull rope, the pull rope is respectively provided with a winding reel at the mechanical energy storage device and the actuating piece, and when the actuating piece is pressed, the winding reels at the positions of the mechanical energy storage device and the actuating piece rotate to enable the mechanical energy storage device to store mechanical energy of the rotating motion so as to drive the saw blade 2 to rotate.

Further, a handle 5 is connected to the second end of the holding rod 4 to facilitate holding by a human hand. It is further preferred that there are three grooves on the side wall of the handle 5, which are approximately finger-shaped, and this design makes the operator more comfortable to hold and meets the ergonomic requirements.

Further, the fruit and vegetable picker further comprises a power supply device and a switch 6, wherein the switch 6 is arranged on the handle 5 and is simultaneously connected with the power supply device and the motor for controlling the motor to work. The power supply device adopts external power supply equipment, specifically, external power supply equipment can be placed on the ground when in use, is connected with the switch 6 through an electric wire outside the picking device, and the motor is connected with the switch 6 through an electric wire inside the handheld rod 4. Of course, the power supply device may be a rechargeable battery and built in the hand-held lever 4, and the motor and the switch 6 may be connected to each other by an electric wire inside the hand-held lever 4.

Further preferably, the switch 6 is a point-controlled double-pole double-throw switch 6, and the saw blade 2 rotates for a certain angle once when the switch 6 is pressed, so that the control is convenient and the energy is saved. The point-control double-pole double-throw switch 6 can respond to sudden conditions such as jamming and the like, and when the sawtooth blocks obstacles such as branches and the like to influence normal work, the switch 6 can control the motor to rotate reversely so as to solve the problem.

Further preferably, the distance between the handle 5 and the V-shaped housing 1 is adjustable. Specifically, the handle 5 is slidably connected to the handheld lever 4, and at this time, the portion of the electric wire of the connection portion of the motor and the switch 6 is disposed inside the handheld lever 4, and the portion of the electric wire of the connection portion of the motor and the switch 6 is disposed outside the handheld lever 4, so that the sliding between the handle 5 and the handheld lever 4 is facilitated, and the electric wire circuit is not interfered. When picking oranges of lower height, the handle 5 slides upwards along the holding rod 4, so that the effect similar to the effect of shortening the rod can be realized, picking of lower height is carried out, and the operation range is enlarged. Of course, the handheld rod 4 can also adopt a telescopic rod, the telescopic rod comprises a fixed rod and a movable rod, and is connected through a movable locking device, so that the length of the telescopic rod is convenient to adjust, oranges of different heights are convenient to pick, and the operation range is enlarged.

Further, this fruit vegetables picker still includes the fruit vegetables collection device 7 of establishing at the first end of handheld pole 4, and fruit vegetables collection device 7 includes an ascending collection opening, and collects the opening and establishes the below at the cut groove correspondingly. In particular, the fruit and vegetable collecting device 7 comprises a recovery frame fixedly connected to the first end of the hand-held lever 4, the recovery frame having the above-mentioned upward collecting opening for collecting the fallen oranges. Hooks or grooves (grooves are adopted in figures 1 to 4) are arranged around the recovery frame and are used for hanging long hoses or cropping bags, so that oranges smoothly slide to the ground along the inner wall of the pipeline, and a picking period is completed.

Specifically, when the fruit and vegetable picking machine is used, an operator holds the handle 5 with one hand to control the switch 6, holds the handheld rod 4 with the other hand, firstly presses a button in the switch 6, the motor drives the saw blade 2 to rotate, then aims the leading-in groove at the fruit stalks of oranges hung under branches in a mature mode, leads the fruit stalks into the cutting groove by moving the handheld rod 4, and the sawteeth exposed out of the accommodating cavity cut off the fruit stalks rapidly, so that the orange stalks fall down into the fruit and vegetable collecting device 7, and one-time picking is realized. After one orange is picked, the picking machine can directly aim at the fruit stem of the next orange for picking, and selective picking is realized.

When the fruit stem cutting device is used, the switch 6 is pressed down to enable the saw blade 2 to rotate and then aim at the fruit stems, so that the rotating speed of the saw blade 2 reaches 8000-12000 r/min before the fruit stems are cut, the saw blade 2 can be rapidly and accurately sawn off, and the phenomenon that the saw blade 2 is clamped by the fruit stems due to the fact that the rotating speed is too low is avoided. Meanwhile, if the point-control double-pole double-throw switch 6 is adopted, the switch 6 needs to be pressed all the time if the saw blade 2 needs to be kept rotating all the time during use. If the point control switch 6 is not adopted, the saw blade 2 can be always in a rotating state by pressing.

In addition, the fruit and vegetable picker in the embodiment can also be used for cutting branches with the diameter of less than 2cm (for example, for trimming branches with different heights), the process of cutting the branches is the same as that of cutting the fruit stems of the oranges, and the operation is simple and convenient. Simultaneously the fruit vegetables in this embodiment are picked the ware and can also be used for weeding, pick the ware back in the whole fruit vegetables that shows in figure 1, can realize the function of weeding after leading-in the cutting groove with the grass, and is simple and convenient and efficient.

In conclusion, the fruit and vegetable picking device in the embodiment has the advantages of simple structure, accurate and rapid picking, low labor intensity, high picking efficiency, low cost, wide operation range, selective picking and capability of ensuring the quality of finished oranges.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention in any way, so that any person skilled in the art can make modifications or changes in the technical content disclosed above. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

Claims

1. A fruit and vegetable picker is characterized by comprising a V-shaped shell (1) and a saw blade (2);

the V-shaped shell (1) comprises a shell body (11) with an accommodating cavity, and a first limiting piece (12) and a second limiting piece (13) which are fixedly connected with the shell body (11) at the same time;

the saw blade (2) is arranged in the accommodating cavity and can rotate in the accommodating cavity, and the shell body (11) is provided with a cutting opening (111) so that part of saw teeth of the saw blade (2) are exposed out of the accommodating cavity and used for cutting fruit stalks of fruits and vegetables;

the first limiting piece (12) is arranged on the outer side of the cutting opening (111), and forms a cutting groove with a V-shaped opening together with the shell body (11);

the second limiting piece (13) and the first limiting piece (12) form an introduction groove with a V-shaped opening, the opening direction of the V-shaped opening of the cutting groove is consistent with the opening direction of the V-shaped opening of the introduction groove, and the opening angle of the V-shaped opening of the introduction groove is larger than or equal to that of the V-shaped opening of the cutting groove;

the second limiting part (13) comprises two inclined edges, one ends of the two inclined edges are fixedly connected, and the other ends of the two inclined edges are respectively fixedly connected with the shell body (11); at least the surface of the first retaining member (12) comprises an elastic buffer material.

2. The fruit and vegetable picker according to claim 1,

the saw teeth are in the shape of oblique teeth, and the oblique direction of the saw teeth and the rotating direction of the saw blade (2) are opposite to the opening direction of the V-shaped opening of the cutting groove.

3. The fruit and vegetable picker according to claim 2,

the saw blade mounting structure is characterized in that the shell body (11) is disc-shaped, a mounting opening (112) is further formed in the shell body (11) and used for mounting the saw blade (2), and the chord length of the mounting opening (112) is larger than the diameter of the saw blade (2).

4. The fruit and vegetable picker according to any one of claims 1 to 3, further comprising a drive device (3) and a hand-held lever (4);

the bottom of the shell body (11) is fixedly connected with the first end of the handheld rod (4), and the center of the saw blade (2) is fixedly connected with the rotating output end of the driving device (3) and is driven to rotate by the driving device (3).

5. The fruit and vegetable picker according to claim 4,

the driving device (3) is a motor, an output shaft of the motor penetrates out of the top of the shell body (11) from the bottom of the shell body (11), the bottom of the shell body (11) is rotatably connected with the output shaft through a fixing piece, and the top of the shell body (11) is fixedly connected with the output shaft and the saw blade (2) through a gasket.

6. The fruit and vegetable picker according to claim 5, further comprising a power supply device and a switch (6) connected to both the power supply device and the motor;

the second end of the handheld rod (4) is connected with a handle (5), the switch (6) is a point control double-pole double-throw switch (6) and is arranged on the handle (5), and the power supply device is arranged in the handheld rod (4) or is an external power supply.

7. The fruit and vegetable picker according to claim 6,

the distance between the handle (5) and the V-shaped shell (1) is adjustable.

8. The fruit and vegetable picker according to claim 4, further comprising a fruit and vegetable collection device (7) provided at the first end of the hand-held lever (4);

the fruit and vegetable collecting device (7) comprises an upward collecting opening, and the collecting opening is correspondingly arranged below the cutting groove.