KR102413367B1 - Auto strapping packaging tool for improving user convenience by weight balance - Google Patents

Abstract

base plate; a tension unit disposed on one side of the upper surface of the base plate and providing a tensile force to the plastic band for packaging according to the rotation of the first driven shaft; a main motor disposed on the other side of the upper surface of the base plate such that a first driving shaft is disposed parallel to the first driven shaft; a welding module disposed between the tension unit and the main motor to provide frictional heat to join a plastic band disposed in two layers; and a main shaft part disposed perpendicular to the first driving shaft and having one end gear-coupled to the main motor to transmit power generated from the main motor to the welding module and the tension unit, respectively. Provides a tool for automatic strapping packaging that improves user convenience through weight distribution.

Description

Automatic strapping packaging tool that improves user convenience through weight distribution {AUTO STRAPPING PACKAGING TOOL FOR IMPROVING USER CONVENIENCE BY WEIGHT BALANCE}

The present invention relates to a tool for automatic strapping packaging, and more particularly, to a tool for automatic strapping packaging used when packaging an article using a plastic band.

The automatic packaging tool is used for packaging items such as boxes through a plastic band in the form of a portable tool. The packaging has a process of first wrapping the item with a plastic band to make a loop, and then pulling the plastic band through an automatic packaging tool until a certain tension is generated. Then, a loop with constant tension is created on an article or the like through a subsequent process of bonding the plastic band of the overlapping two-layered part. Here, the bonding usually applies frictional heat generated by vibration while the plastic band is pressed. For this reason, bonding between homogeneous materials occurs in the plastic band that is locally molten. Then, when natural cooling is achieved, the loop by the plastic band is firmly formed through the joint.

Conventional tools for automatic packaging usually have a similar shape. This is due to the shape of the body housing, the configuration of parts disposed therein, and the arrangement structure thereof. In the conventional automatic packaging tool, the overall weight distribution is unbalanced due to the arrangement structure between the tension unit providing tension, the electric motor providing power to the tension unit, and the like, thereby raising inconvenience in terms of ease of use. In addition, the conventional automatic packaging tool has a problem in that it is difficult to cope with a failure or the like due to the complexity of the structure, and the cost of purchase and maintenance increases. In addition, there was a need to develop a new operating method and structure in order to release a completely different concept of automatic packaging tool.

Korean Patent Registration No. 10-1675003 (Registered on November 4, 2016) Strapping device with gear system device Korean Patent Registration No. 10-1613247 (Registered on April 11, 2016) Strapping device with tensioner Korean Patent Publication No. 10-2019-0034662 (published on April 2, 2019) Strapping device

The embodiment of the present invention has been devised to solve the above problems, and it is intended to provide a tool for automatic packaging having a new configuration and structure by newly developing a design for a conventional automatic packaging tool. We aim to provide a tool for automatic packaging that improves user convenience by appropriately reflecting the overall weight distribution.

We would like to provide a welding module with a new concept that can properly utilize the internal space of the body housing. In addition, the welding module adopts each sub-motor used in the pressurization step to be controlled independently of the main motor, thereby securing control reliability for the welding module. In addition, by facilitating a coupling relationship between each component of the present welding assembly, maintenance and management are convenient.

An embodiment of the present invention to solve the above problems, the base plate; a tension unit disposed on one side of the upper surface of the base plate and providing a tensile force to the plastic band for packaging according to the rotation of the first driven shaft; a main motor disposed on the other side of the upper surface of the base plate such that a first driving shaft is disposed parallel to the first driven shaft; a welding module disposed between the tension unit and the main motor to provide frictional heat to join a plastic band disposed in two layers; and a main shaft part disposed perpendicular to the first driving shaft and having one end gear-coupled to the main motor to transmit power generated from the main motor to the welding module and the tension unit, respectively. Provides a tool for automatic strapping packaging that improves user convenience through weight distribution.

The tension unit is disposed on the outside of the tension unit in parallel with the first driven shaft, the tension unit driving gear portion for transmitting the first rotational force in the forward direction of the main motor to the first driven shaft; further comprising it is preferable

The tension unit driving gear unit may include: a first gear shaft having a bevel gear coupled to an outer circumferential surface and having a first screw thread formed at an end thereof; and a second gear shaft disposed parallel to the first gear shaft and having a spur gear set coupled to an outer circumferential surface to transmit the first rotational force from the first gear shaft to the tension unit.

Preferably, the main shaft unit further includes a welding module driving gear unit configured to transmit a second rotational force in the reverse direction of the main motor to the welding module.

The welding module includes: a pressing unit for pressing the plastic band for packaging disposed in two layers between the upper gripper and the lower gripper while the press unit disposed on the upper end moves downward and the upper gripper is pressed by the press unit; and a friction unit that receives the rotational force of the main shaft and linearly reciprocates the upper gripper.

The friction unit may include a second driven shaft engaged with the main shaft and pivoted; an eccentric cylindrical element formed on an outer circumferential surface of the second driven shaft; and a link arm having one end coupled to the second driven shaft and the other end coupled to the upper gripper part.

The welding module may include: a sub-motor engaged with the press unit to elevate and lower the press unit; and a cutting unit for cutting the plastic band by interlocking lowering according to the lowering operation of the press unit.

The cutting unit may include a cutting body having an accommodating space inside and a coupling groove formed on one side thereof; a cutting blade coupled to the coupling groove and having a sliding hole in the vertical direction; and a reaction element accommodated in the accommodating space and providing an elastic restoring force for elevating the cutting body when the cutting unit descends.

The welding module further includes a connecting pin penetrating each of the press unit, the cutting blade, and the cutting body in a horizontal direction, and an elastic spring is disposed in the sliding hole in a vertical direction according to the lowering operation of the press unit. It is preferable to press the cutting blade by being compressed by the connecting pin.

According to the problem solving means of the present invention as described above, various effects including the following items can be expected. However, the present invention is not established only when exhibiting all of the following effects.

The automatic strapping packaging tool with improved user convenience through weight distribution according to an embodiment of the present invention can provide a new configuration and structure different from the conventional automatic packaging tool. In addition, the automatic packaging tool can improve user convenience by properly reflecting the overall weight distribution.

In addition, it is possible to provide a welding module of a new concept that can properly utilize the inner space of the body housing. In addition, the welding module can be controlled independently of the main motor by separately adopting a sub-motor used in the pressing step, thereby ensuring control reliability of the welding module. In addition, by facilitating a coupling relationship between each component of the present welding assembly, maintenance and management may be convenient.

1 is a perspective view of a tool for automatic strapping packaging according to an embodiment;
Figure 2 is an exploded perspective view of Figure 1;
3 is a view showing a path through which power generated from the main motor of FIG. 1 is transmitted through the main shaft;
Figure 4 is a partially exploded perspective view of Figure 3;
Figure 5 is a perspective view of the welding module of Figure 1;
Figure 6 is an exploded perspective view of Figure 5;

Hereinafter, in the description of the present invention, if it is determined that the subject matter of the present invention may be unnecessarily obscured as it is obvious to those skilled in the art with respect to related known functions, the detailed description thereof will be omitted. The terminology used in the present application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as "comprise" or "have" are intended to designate that a feature, number, step, operation, component, part, or a combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

1 is a perspective view of an automatic strapping packaging tool according to an embodiment, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a view showing a path through which power generated from the main motor of FIG. 1 is transmitted through the main shaft part. , FIG. 4 is a partially exploded perspective view of FIG. 3 .

1 to 4, the tool for automatic strapping packaging according to an embodiment of the present invention is a base plate 100, a tension unit 200, a main motor 300, a welding module 1000, a main shaft part ( 400), a sub-motor 1140, and the like. In the automatic scraping packaging tool, a plastic band for packaging is first arranged to surround a target article, and then a tensile force of a certain size is applied to the plastic band through the tension unit 200 . Then, after the plastic band is placed to be overlapped in two layers, frictional heat generated by vibration is provided in a pressurized state through the welding module 1000 so that the plastic band is locally melted and joined. Here, the plastic band may be formed of a PP or PET material.

The base plate 100 according to an embodiment may be a part of the body housing, in particular, a part forming the bottom part. This base plate 100 has a flat bottom surface so that the tool for automatic strapping and packaging can be arranged in a vertical direction on the object or the like by interviewing the flat surface constituting the ground. However, although the base plate 100 shown in FIGS. 1 to 4 has a rectangular shape, this is only an exemplary embodiment and is not necessarily limited thereto. In addition, the base plate 100 may further include at least one mounting element so that various parts constituting the tool for automatic strapping and packaging can be stably arranged, installed, fixed, and the like.

The tension unit 200 is disposed on one side of the upper surface of the base plate 100 and provides a tensile force to the plastic band for packaging according to the rotation of the first driven shaft 210 . The tension unit 200 receives the rotational force provided by the main motor 300 and winds one end of the plastic band. The tensile unit 200 may provide a tensile force during the strapping process by pulling the plastic band. Tension unit 200 is disposed in the inner center of the first driven shaft 210 axially rotated, is disposed on the outer periphery of the first driven shaft 210 and is meshed with the first driven shaft 210 to reduce rotation. It may include a worm gear unit that is an assembly. In addition, the tension unit 200 may further include a feed wheel 212 that is coupled to the outer circumferential surface of the worm gear unit and rotates together, and winds and pulls the plastic band by frictional force due to pressure. The feed wheel 212 has a cylindrical shape, and a knurling portion is formed on the outer peripheral surface.

In addition, the tension unit 200 is disposed on the outside of the tension unit 200 in parallel with the first driven shaft 210 , and applies a first rotational force in the forward direction of the main motor 300 to the first driven shaft 210 . It may further include a tension unit driving gear unit 230 to transmit. Specifically, the tension unit driving gear unit 230 includes a first gear shaft 232 having a bevel gear coupled to an outer circumferential surface and a first screw thread portion formed at an end thereof, and disposed in parallel with the first gear shaft 232, the outer circumferential surface The spur gear set 236 may be coupled to the spur gear set 236 to further include a second gear shaft 234 for transferring the first rotational force from the first gear shaft 232 to the tension unit 200 .

Meanwhile, the tension unit driving gear unit 230 may further include a one-way clutch bearing 510 . As a result, when the main motor 300 provides the second rotational force in the reverse direction, the second rotational force is blocked from being transmitted to the tensioning unit 200 through the tensioning unit driving gear unit 230 .

The first driven shaft 310 and the first driven shaft 210 are spaced apart from each other by a predetermined distance and are disposed parallel to each other. Meanwhile, the main shaft unit 400 serves to transmit the rotational force generated from the first driven shaft 310 to the first driven shaft 210 . To this end, bevel gears are respectively formed at both ends of the main shaft part 400 and the ends of the first driving shaft 310 . In addition, a bevel gear that meshes with any one of the bevel gears of the main shaft part 400 is also coupled to the first gear shaft 232 . The spur gear set 236 is composed of a pair of spur gears spaced apart from each other by a predetermined interval, and serves to transmit the rotational force transmitted to the second gear shaft 234 through the first screw thread to the end of the first driven shaft 210 . do Specifically, the spur gear set 236 may be meshed with a gear disposed at an end of the first driven shaft 210 . As a result, the first rotational force generated from the main motor 300 is the first type through the first driving shaft 310 , the main shaft part 400 , the first gear shaft 232 , and the second gear shaft 234 . It may be transmitted coaxially (210).

The main motor 300 is disposed on the other side of the upper surface of the base plate 100 such that the first driven shaft 310 is disposed parallel to the first driven shaft 210 . That is, the tension unit 200 is disposed on one side of the upper surface of the base plate 100 , and the main motor 300 is disposed on the other side of the upper surface of the base plate. By adjusting the arrangement position of the main motor 300 , that is, the separation distance of the main motor 300 with respect to the tension unit 200 , the weight applied to the base plate 100 can be easily distributed. This is a part that is differentiated from the internal arrangement structure of the conventional automatic strapping packaging tool, and user convenience can be improved by properly distributing the weight. That is, the weight applied to the base plate 100 can be effectively dispersed by adjusting the arrangement position of the main motor 300 , so that even if the user performs packaging work for a long time, strain on the wrist joint and the like does not occur.

The main motor 300 may provide the first rotational force through rotation in the forward direction. In addition, the main motor 300 may provide the second rotational force through rotation in the reverse direction. Meanwhile, in the main motor 300 , operations such as rotation speed and rotation time are controlled by a controller (not shown).

The main shaft part 400 is disposed perpendicular to the first driving shaft 310, and one end is gear-coupled with the main motor 300 to apply power generated from the main motor 300 to the welding module 1000 and the tension unit ( 200), respectively. On the other hand, the main shaft unit 400 further includes a welding module driving gear unit 1400 that transmits the second rotational force by the reverse direction of the main motor 300 to the welding module 1000 . The welding module driving gear unit 1400 is coupled to the outer circumferential surface of the main shaft unit 400 , and includes a first gear formed with a first radius and a second gear meshed with the first gear, and a second gear formed with a second radius. Here, the first radius is preferably larger than the second radius. This is to provide vibration through the friction unit 1200 .

Meanwhile, a one-way clutch bearing 510 may be interposed between the inner circumferential surface of the first gear and the outer circumferential surface of the main shaft part 400 . The one-way clutch bearing 510 blocks transmission of the first rotational force to the welding module 1000 when the main motor 300 generates the first rotational force in the forward direction.

5 is a perspective view of the welding module of FIG. 1 , and FIG. 6 is an exploded perspective view of FIG. 5 .

The welding module 1000 is disposed between the tension unit 200 and the main motor 300, and provides frictional heat to join the plastic bands arranged in two layers. The welding module 1000 is disposed in a vertical direction from the upper surface of the base plate 100 . On the other hand, each type of units, parts, etc. constituting the welding module 1000 may be installed, mounted, and fixed through mounting elements formed in all or part of the base plate 100 even though not shown in the drawings. On the other hand, various units and parts constituting the welding module 1000 may be installed, mounted, and fixed by mounting elements formed inside the body housing including the base plate 100 .

Specifically, the welding module 1000 includes a pressing unit 1100 , a friction unit 1200 , and a cutting unit 1300 . In the pressing unit 1100, the upper gripper unit 1120 and the lower gripper unit 1130 are lowered and the upper gripper unit 1120 is pressed by the press unit 1110. It serves to press the plastic band for packaging placed in two layers between them. The pressing unit 1100 may raise and lower the press unit 1110 through the sub-motor 1140 disposed in the upper space. That is, the sub-motor 1140 is engaged with the press unit 1110 to raise and lower the press unit 1110 . At this time, it is preferable that the main motor 300 and the sub-motor 1140 are electric motors operated by electric power supplied from the outside (power source such as a battery). The sub-motor 1140 may rotate in a forward direction or a reverse direction according to the control of the controller.

At the upper end of the press unit 1110 , a pressing gear element that meshes with the shaft of the sub-motor 1140 is formed in order to receive rotational force due to rotation of the shaft of the sub-motor 1140 . Meanwhile, it is preferable that a gap of the first interval L1 is formed between the lower surface of the press unit 1110 and the upper surface of the upper gripper unit 1120 .

The upper gripper unit 1120 is pressed by the press unit 1110, and when the second rotational force is transmitted through the welding module driving gear unit 1400 and the friction unit 1200, it performs a linear reciprocating motion within a predetermined stroke. That is, the upper gripper unit 1120 vibrates. On the other hand, a plurality of rectangular grooves are formed on the upper surface of the upper gripper unit 1120 . The rectangular groove is formed in the same direction as the vibration direction of the upper gripper unit 1120 . On the other hand, the same rectangular groove is also formed on the lower surface of the press unit 1110. An empty space is formed by the rectangular grooves respectively formed in the press part 1110 and the upper gripper part 1120 , in which the ball bearing can be accommodated and seated.

Also, a spring may be disposed on the upper surface of the upper gripper unit 1120 in a vertical direction. When the press unit 1110 moves downward by the sub-motor 1140 , the upper gripper unit 1120 comes into contact with the lower gripper unit 1130 . At this time, when the sub-motor 1140 further rotates in the same direction, the upper gripper unit 1120 enters a pressurized state that presses the lower gripper unit 1130 . When changing from the contact state to the pressurized state, the first gap L1 is reduced and at the same time the spring disposed therein is compressed.

In addition, the press unit 1110 and the upper gripper unit 1120 may maintain a coupled state by a pair of links 1340 disposed to face each other in the vertical direction. On the other hand, a circular hole and a rectangular hole 1342 are formed in the link 1340, respectively. The connection pin 1500 is through-coupled to the rectangular hole 1342 of the link 1340, and when the pressing unit 1100 is changed from the contact state to the pressing state, the connection pin 1500 can be further descended by a fine interval. let it be

In addition, a link receiving groove is formed in the upper gripper unit 1120 so that one end of the link arm 1230 is received and coupled. In addition, knurling plates that face each other are formed on the lower surface of the upper gripper part 1120 and the upper surface of the lower gripper part 1130 . A plastic band overlapped in two layers is disposed on the upper surface of the lower gripper unit 1130 , and when the pressurization state of the pressurization unit 1100 is reached, the upper gripper unit 1120 is a plastic with power transmitted through the friction unit 1200 . Frictional heat can be generated in the band.

The welding module 1000 may further include a cutting unit 1300 for cutting the plastic band by interlocking and descending according to the lowering operation of the press unit 1110 . The welding module 1000 may further include a connection pin 1500 penetrating each of the press unit 1110 , the cutting blade 1320 , and the cutting body 1310 in a horizontal direction. Specifically, the cutting unit 1300 includes a cutting body 1310 , a cutting blade 1320 , a reaction element 1330 , and the like. The cutting body 1310 has a receiving space on the inside and a coupling groove formed on one side thereof. The cutting body 1310 serves as a weight for applying a load to the lowering cutting blade 1320 .

The cutting blade 1320 is coupled to the coupling groove, and a sliding hole is formed in the vertical direction. A spring that provides an elastic force is formed in the sliding hole during the vertical operation of the cutting blade 1320 . At this time, when the press unit 1110 descends, the spring is pressed and compressed by the connection pin 1500 to lower the cutting blade 1320 . The reaction element 1330 is accommodated in the receiving space portion, and when the cutting unit 1300 descends, it provides an elastic restoring force for elevating the cutting body 1310 . The reaction element 1330 includes a spring, and when the cutting unit 1300 descends, it generates an elastic restoring force according to compression.

The friction unit 1200 receives the rotational force of the main shaft unit 400 to linearly reciprocate the upper gripper unit 1120 . The friction unit 1200 is disposed on one side of the pressurization unit 1100, and the press unit 1110 descends through the sub-motor 1140. The second rotational force by the reverse direction of the motor 300 is transmitted. Specifically, the friction unit 1200 may include a second driven shaft 1210 , an eccentric cylindrical element 1212 , a link arm 1230 , and the like. The second driven shaft 1210 is meshed with the main shaft part 400 to rotate the shaft. Specifically, the second driven shaft 1210 meshes with the second gear shaft 234 of the welding module driving gear unit 1400 . On the other hand, an eccentric cylindrical element 1212 is formed on the outer circumferential surface of the second driven shaft 1210 .

One end of the link arm 1230 is coupled to the second driven shaft 1210 , and the other end is coupled to the upper gripper unit 1120 . The link arm 1230 performs a linear reciprocating motion within a certain stroke range according to the axial rotation of the second driven shaft 1210 due to the eccentric cylindrical element 1212 formed on the second driven shaft 1210 . Accordingly, the second rotational force generated from the main motor 300 passes through the main shaft unit 400, the welding module driving gear unit 1400, the second driven shaft 1210, and the link arm 1230, and finally the upper gripper unit ( 1120) to generate vibration. In addition, the other end of the link arm 1230 is accommodated in the link arm receiving groove of the upper gripper unit 1120, and may be coupled through a fixing pin or the like.

The strapping process by the automatic strapping packaging tool of FIG. 1 is as follows. First, in a state where one end of the plastic band is pressed to the tension unit 200 , when the main motor 300 axially rotates in the forward direction to generate a first rotational force, the first rotational force is the main shaft part 400 , the tensioning unit. The first driven shaft 210 of the tension unit 200 is rotated through the driving gear unit 230 . At this time, a tensile force of an appropriate size is provided to the plastic band. Through this, the step of providing the tensile force is completed.

Then, the pressing unit 1100 is operated for welding. This starts in the pressurizing step, which ends when the press unit 1110 descends by the sub-motor 1140 and the pressurizing unit 1100 is changed to the pressurized state through the contact state. Then, when the main motor 300 shaft rotates in the reverse direction to generate a second rotational force, the second rotational force is the main shaft part 400, the welding module driving gear part 1400, the second driven shaft 1210, and the link arm. The upper gripper part 1120 of the friction unit 1200 is vibrated through 1230 . As a result, the plastic band overlapped in two layers between the upper gripper part 1120 and the lower gripper part 1130 is locally melted and joined.

In the above, preferred embodiments of the present invention have been exemplarily described, but the scope of the present invention is not limited to such specific embodiments, and can be appropriately changed within the scope described in the claims.

100: base plate 200: tension unit
300: main motor 400: main shaft part
1000: welding module

210: first driven shaft 230: tension unit drive gear unit
232: first gear shaft 234: second gear shaft
236: spur gear set 212: feed wheel
510: one-way clutch bearing
1100: press unit 1110: press unit
1120: upper gripper part 1130: lower gripper part
1140: sub motor
1200: friction unit 1210: second driven shaft
1212: eccentric cylindrical element 1230: link arm

1300: cutting unit 1310: cutting body
1320: cutting blade 1330: kickback element
1340: link 1342: rectangular hole
1400: welding module driving gear unit 1500: connecting pin

Claims (9)

base plate;
a tension unit disposed on one side of the upper surface of the base plate and providing a tensile force to the plastic band for packaging according to the rotation of the first driven shaft;
a main motor disposed on the other side of the upper surface of the base plate such that a first driving shaft is disposed parallel to the first driven shaft;
a welding module disposed between the tension unit and the main motor to provide frictional heat to join a plastic band disposed in two layers; and
and a main shaft part disposed perpendicular to the first driving shaft and having one end geared to the main motor to transmit power generated from the main motor to the welding module and the tension unit, respectively;
The main shaft part automatic strapping packaging tool that improves user convenience through weight distribution, characterized in that it further comprises;
According to claim 1, wherein the tension unit,
The tension unit driving gear part disposed on the outside of the tension unit in parallel to the first driven shaft and transmitting the first rotational force in the forward direction of the main motor to the first driven shaft; Tool for automatic strapping packaging with improved convenience. According to claim 2, wherein the tension unit driving gear unit,
a first gear shaft having a bevel gear coupled to an outer circumferential surface and having a first screw thread formed at an end thereof; and
a second gear shaft disposed parallel to the first gear shaft and coupled to an outer peripheral surface of a spur gear set to transmit the first rotational force from the first gear shaft to the tension unit; Tool for automatic strapping packaging with improved convenience.
delete The method of claim 1, wherein the welding module,
a pressing unit for pressing the plastic band for packaging disposed in two layers between the upper gripper and the lower gripper while the press unit disposed on the upper end moves downward and the upper gripper unit is pressed by the press unit; and
A tool for automatic strapping and packaging that improves user convenience through weight distribution including a friction unit that receives the rotational force of the main shaft and linearly reciprocates the upper gripper.
The method of claim 5, wherein the friction unit is
a second driven shaft meshed with the main shaft and pivoted;
an eccentric cylindrical element formed on an outer circumferential surface of the second driven shaft; and
A tool for automatic strapping packaging that improves user convenience through weight distribution further comprising a link arm having one end coupled to the second driven shaft and the other end coupled to the upper gripper part.
According to claim 5, wherein the welding module,
a sub motor engaged with the press unit to elevate the press unit; and
Automatic strapping packaging tool that improves user convenience through weight distribution further comprising;
The method of claim 7, wherein the cutting unit,
a cutting body having a receiving space inside and a coupling groove formed on one side thereof;
a cutting blade coupled to the coupling groove and having a sliding hole in the vertical direction; and
A tool for automatic strapping packaging that improves user convenience through weight distribution including a; a recoil element accommodated in the receiving space and providing an elastic restoring force for raising and lowering the cutting body when the cutting unit is lowered.
The method of claim 8, wherein the welding module is
The press unit, the cutting blade, and the connecting pins each passing through the cutting body in the horizontal direction; further comprising,
An elastic spring is disposed in the sliding hole in a vertical direction and is compressed by the connecting pin according to the lowering operation of the press unit to improve user convenience through weight distribution to press the cutting blade.

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