JP2010275088A - Tape cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tape cutter wherein a non-adhesive portion (a peeling allowance) can be formed in simple operation by turning a tape around its front end stuck to the cutter, for allowing easy peel-off of the tape pasted onto the upper cover of a corrugated board box and easy pull-out of the tape in next-time use. <P>SOLUTION: The tape cutter 100 includes a body 1 as a base, a first rocking arm 30 and a first elastic member (a compression spring) B1 provided at the front part thereof, a second rocking arm 40 and a second elastic member (a tension spring) B2 connected thereto, and a cutter C arranged at the center of the second rocking arm 40. Energizing force F1 to energize the first rocking arm 30 in a tape pulling-out direction X is set to be stronger than an energizing force F2 to energize the second rocking arm 40 in the tape pulling-out direction. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a tape cutter that affixes an upper lid of a cardboard box or the like with a packing tape. After cutting the wound adhesive tape, the tip of the tape attached to the cutter is folded back to remove the non-adhesive portion (peeling allowance). If it is prepared, it relates to a tape that can be easily pulled out and peeled off at the next use.

  Conventionally, a tape cutter for packing tape has been provided. As an example, as shown in FIG. 31, the packing tape cutter includes a cylindrical core 1 </ b> A that rotatably supports a wound adhesive tape 10 at the back of the main body 1. Further, the tape feeding portion 1B in front of the main body 1 is provided with bifurcated tape guides 1C and 1D that hold the both ends of the tape being fed so as not to be removed, and a cutter C on the upper side portion of the tape guide.

  The sticking operation by the tape cutter first pulls out the tape tip portion 10B cut by the cutter C by hand. Then, the tape front-end | tip part is affixed on side part S1 of cardboard box DB. Then, the upper lids F3 and F4 of the cardboard box DB are pasted, and the opposite ends of the upper lids F3 and F4 are pulled out and pasted to a place where they have come out, and the tape is cut and pasted to the side surface S2 on the opposite side. is there.

The above tape cutter has been improved so that the tape that closes the top lid of the cardboard box can be easily peeled off, and the tape tip attached to the cutter can be folded back so that it can be easily pulled out the next time. A tape cutter capable of creating (peeling allowance) has been filed.
The configuration includes a cylindrical core portion that rotatably supports the wound adhesive tape on the rear side, and a bifurcated tape guide that holds the both ends of the tape being fed so as not to come off below the front tape feeding portion, and Provided with a tape holding part with the tip facing upward at an intermediate position of the tape guide, and a main body having a pin support part above the tape feeding part, and covering the outside of the pin support part of the main body. A bifurcated tape folding guide wall is pivotally supported by a common pin so as to be rotatable in the vertical direction, and a cutter is pivotally supported between the tape folding upper guide walls below the pin support portion. The lower guide wall has an upper limit stopper, a lower limit stopper, and a tape guide that regulate the rotation angle of the cutter, a tension spring that biases the cutter toward the lower limit stopper side, and a taper. The dimension between the folded lower guide walls is provided with a folded lever body made slightly narrower than the width of the tape. After the tape is cut, the lever portion of the folded lever body is rotated upward so that the axis between the above folded tape upper guide walls The inner surface portion of the supported cutter tip is brought into contact with the tape pressing portion of the main body, and the tape tip is pressed to form a non-adhesive portion at the tape tip (see, for example, Patent Document 1). .

JP 2005-350257 A

  According to the tape cutter disclosed in Japanese Patent Laid-Open No. 2005-350257, a non-adhesive portion that is folded at the end of the tape is created in preparation for the next time. There was a problem that the non-adhesive part could not be created unless the core part was changed to the left hand.

  Specifically, the operation procedure will be described in detail. Hold the cylindrical core portion of the main body and the lever portion of the folding lever body simultaneously with the right hand, and pull downward with the tip of the wound adhesive tape with the left hand. Subsequently, when the leading end of the wound adhesive tape is pulled back and pulled between the lower guide walls with the left hand, the adhesive tape is applied to the cutter and pulled upward. When the cutter is rotated to the upper limit position, the cylindrical part of the wound adhesive tape is pressed so that the tape does not move, and the cutter is lowered to cut the adhesive tape. After cutting the tape, the cutter comes back against the lower limit stopper by the restoring force of the tension spring and stops. At this time, the tip of the tape adheres to the blade of the cutter with adhesive tape, the tape adhesive surface comes into light contact with the tape guide, and is held in a curved state on the inner surface of the tip of the cutter blade. Subsequently, when the cylindrical core part at the bottom of the main body is changed to the left hand, the lever part of the turning lever body is turned upward with the right hand, and the tip of the cutter is brought into pressure contact with the tape pressing part of the main body. Thus, a non-adhesive part is formed. As described above, if the operation is not performed by both hands, the work cannot be turned back, so that the work efficiency is poor, and the cutter moves at the time of cutting the tape.

The present invention has been made based on the problems of the above tape cutter, and its purpose is to improve workability.
That is, the folding work for creating the non-adhesive part can be performed while holding the cylindrical core part of the main body and the upper cover at the same time with the right hand, and when cutting the tape, the cutter part is in the tape drawing direction (upward) Wrap from the top with a tape cover with a tape width regulating member that is a leaf spring to prevent the tape from being removed from the cutter, so that it does not interfere with cutting in a narrow space. Holding the adhesive tape.
In addition, the cutter blade has a structure in which a cutting blade provided forward and a cutting blade directed upward at an angle of approximately 90 ° are alternately provided. The tape is stabbed and cut with a cutting blade directed upward. That is, the tape is completely prevented from being detached from the cutter by the synergistic action of the above-mentioned tape cover and the above-mentioned cutting edge that is stuck into the tape toward the front.
In addition, since the tape does not stab and detach from the cutting edge directed forward, a slight gap is provided so that both ends of the tape do not come into contact with the guide wall in order to reliably perform the folding operation for creating the non-adhesive portion.

In order to achieve the above object, a tape cutter according to claim 1 of the present invention is a tape cover in which a cylindrical core portion that rotatably supports a wound adhesive tape is formed at the right end, and the wound adhesive tape is pressed upward on the left side. A tape guide that regulates the position of both ends of the tape fed from the wound adhesive tape is arranged at the lower part, and a tape pressing part is arranged at a position in front of the lower part and in contact with the cutter front part. On the left side of the tape guide, a main body in which a guide roller that contacts and regulates the position of the non-adhesive surface of the tape is rotatably arranged by a support pin;
Extending from the first swing fulcrum at the top of the main body in a direction intersecting the tape pull-out direction, configured to be swingable around the first swing fulcrum, and biased in the tape pull-out direction by the first elastic member; A first swinging arm configured to be swingable in an anti-tape pulling direction against the biasing force of the first elastic member, and having a cover disposed above;
Extending from the second swing fulcrum of the lower portion of the first swing arm in a direction deviating toward the tape pull-out direction from the direction intersecting the tape pull-out direction, and configured to swing around the second swing fulcrum. The cutter is disposed in the center, and is biased in the tape pull-out direction by the second elastic member having a smaller elastic force than the first elastic member, and swings in the anti-tape pull-out direction against the biasing force of the second elastic member. A second swing arm configured to be movable,
Pull out the tip of the wound adhesive tape, cut the tape against the cutter of the second swing arm, hold the tape at the tip of the cutter, and first resist the second swing arm against the second elastic member. Then, refracting downward, bending the tape tip toward the adhesive surface, the second oscillating arm refracts the first oscillating arm in an even stronger refracting operation, and presses the front of the cutter against the tape pressing part of the main body. Thus, a non-adhesive portion is formed at the tip portion of the tape.

  The tape cutter according to claim 2 of the present invention is the tape cutter according to claim 1, wherein the cutter is a cutting blade provided forward and a cutting blade directed upward at an angle of approximately 90 °. Are provided alternately.

  According to the above means, the following effects can be obtained. The tape cutter of the present invention has the cylindrical core part of the main body and the lever part of the upper tape cover at the same time with the right hand, the tip part of the wound adhesive tape with the left hand, and passes upward between the lower tape guide and the guide roller. Pull out and cut the tape by applying it to the cutter.

  Subsequently, a non-adhesive portion can be formed at the tip of the tape by bending the second swing arm end downward with the left hand. Further, the non-adhesive portion can be formed by pressing the second swing arm end against the cardboard wall or the like without using the left hand.

  According to the tape cutter of the present invention, it is possible to surely form the non-adhesive portion by one-hand operation by folding back the tape end in preparation for the next time. Moreover, when peeling a tape, it can be easily peeled by being pinched with a fingertip. Therefore, the cutting operation and the folding operation of the tape end can be easily performed with a simple operation. Thereby, a tape sticking and the folding | returning part of a tape end can be formed quickly and accurately.

1 is a perspective view of a tape cutter according to a first embodiment of the present invention. 1 is a developed perspective view of a tape cutter according to a first embodiment of the present invention. FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is the front view of the tape cutter which shows the 1st Embodiment of this invention. 1 shows a first embodiment of the present invention and is a left side view of a tape cutter. FIG. 1 shows a first embodiment of the present invention and is a plan view of a tape cutter. FIG. 1 is a bottom view of a tape cutter according to a first embodiment of the present invention. 1 shows a first embodiment of the present invention and is a front view of a frame. FIG. FIG. 2 is a left side view of the frame, showing the first embodiment of the present invention. 1 shows a first embodiment of the present invention and is a bottom view of a frame. FIG. FIG. 3 is a front view of the first swing arm according to the first embodiment of the present invention. FIG. 3 is a left side view of the first swing arm according to the first embodiment of this invention. It is a front view of the 2nd swing arm which shows a 1st embodiment of the present invention. FIG. 3 is a left side view of a second swing arm according to the first embodiment of this invention. FIG. 3 is a right side view of a second swing arm according to the first embodiment of this invention. It is a detailed view of a cutter, showing the first embodiment of the present invention. FIG. 3 is a diagram illustrating an operation of the tape loading method according to the first embodiment of this invention. FIG. 3 is a diagram illustrating an operation of the tape loading method according to the first embodiment of this invention. It is operation | movement explanatory drawing of the tape cutting method which shows the 1st Embodiment of this invention. It is operation | movement explanatory drawing of the tape cutting method which shows the 1st Embodiment of this invention. FIG. 2 is a first operation explanatory diagram of the tape end peeling allowance creation according to the first embodiment of this invention. FIG. 2 is a first operation explanatory diagram of the tape end peeling allowance creation according to the first embodiment of this invention. FIG. 2 is a first operation explanatory diagram of the tape end peeling allowance creation according to the first embodiment of this invention. FIG. 2 is a first operation explanatory diagram of the tape end peeling allowance creation according to the first embodiment of this invention. FIG. 2 is a first operation explanatory diagram of the tape end peeling allowance creation according to the first embodiment of this invention. FIG. 4 is a second operation diagram for explaining a tape end peeling allowance according to the first embodiment of this invention. FIG. 4 is a second operation diagram for explaining a tape end peeling allowance according to the first embodiment of this invention. FIG. 4 is a second operation diagram for explaining a tape end peeling allowance according to the first embodiment of this invention. It is a top view which shows the 1st Embodiment of this invention and operates a tape cutter with a right hand. 1 is a perspective view of a wound adhesive tape according to a first embodiment of the present invention. It is the state figure which showed the 1st Embodiment of this invention and was affixed on the cardboard box with the tape with peeling allowance. It is a perspective view of the sticking operation situation in the cardboard box of the conventional tape sticking apparatus.

Hereinafter, the form for implementing this invention is demonstrated taking the 1st Embodiment shown in FIGS. 1-30 as an example. As shown in FIGS. 1 to 15, the main components of the tape cutter 100 of the present invention include a main body 1 as a base, a first swing arm 30 provided in front of the main body 1, and a second swing connected to the first swing arm 30. It consists of an arm 40 and a cutter C arranged in the middle part of the second swing arm 40.
The main body 1 has a cylindrical core portion 1A which is formed to protrude to support the wound adhesive tape 10 so as to be rotatable at the right end in the drawing, and mounting seats 1G and 1H having arcuate end faces for attaching various members to the front position. Is integrally formed of a resin material. The mounting seats 1G and 1H of the main body 1 are provided with an arcuate frame body 1F having a concave cross section. An arc-shaped tape cover 20 is provided at the upper end portion of the frame body 1F, and is disposed above the wound adhesive tape held on the cylindrical core portion 1A.

  The tape cover 20 is provided with a tape width restricting portion 20H at the tail end that restricts the wound adhesive tape 10 from dropping off. In order to attach the wound adhesive tape 10 to the cylindrical core 1A, the tail end of the tape cover 20 is lifted upward so as to be separated from the cylindrical core 1A, and the tape is attached. After the tape is mounted, since the tape cover 20 is a leaf spring, the inner surface of the tail end comes into contact with the outer peripheral surface of the tape by the restoring force, and the tape width regulating portion 20H is located on the side surface of the tape. This prevents the wound adhesive tape 10 from falling off.

  A tape feeding portion 1B is provided at the front lower side of the frame body 1F attached to the main body 1. Beneath the arcuate end plates 1G and 1H, a pair of bifurcated tape guides 1C and 1D that regulate the positions of both ends of the tape 10A fed out from the wound adhesive tape 10 so as not to come off are arranged in pairs. Has been. Further, on the upper side of the tape guides 1C and 1D, a guide roller 2R that contacts and regulates the position of the non-adhesive surface of the tape 10A is a support pin 3P that passes through support holes H5 and H5 provided in the flange plates 1G and 1H. It is arrange | positioned so that rotation is possible. A tape pressing portion 1E is disposed on the outer surface of the frame body 1F that is located above the guide roller 2R.

At the upper position of the tape pressing part 1E arranged in the frame body 1F, the first swing arm 30 is passed through the support holes H1 and H1 provided at the upper positions of the flange plates 1G and 1H of the arcuate end faces. Supported by P1. The configuration of the first swing arm 30 includes a pair of support plates 30A and 30B connected to the left and right ends of the holding plate 30C, and support holes H2 opened on the first swing support point O1 side of the support plates 30A and 30B. H2 is aligned with the support holes H1 and H1 of the main plate 30A and 30B, and is supported by tightening with a nut N through support pins P1.
The first swing arm 30 is extended from the first swing fulcrum O1 on the upper side of the plates 1G and 1H of the main body 1 in a direction intersecting with the tape drawing direction X, and swings around the first swing fulcrum O1. It is configured so as to be urged in the tape pull-out direction X by a pair of compression springs B1 attached to the outer surface of the frame body 1F and the lower surface of the holding plate 30C of the first swing arm 30, and the urging force F1 of the compression spring B1 On the contrary, it is configured to be swingable in the anti-tape pulling direction Y. Note that the rotation angle of the first swing arm 30 in the tape drawing direction X is regulated by the convex portions a and b provided on the inner surfaces of the flange plates 1G and 1H, and both ends of the compression spring B1 are also swung in the first direction. It is regulated by a convex portion c provided on the lower surface of the holding plate 30C of the arm 30 and a convex portion d provided on the outer surface of the frame body 1F of the main body 1.

  The second swing arm 40 is aligned with the support holes H4 and H4 opened in the flange plates 40A and 40B in the support holes H3 and H3 opened in the second swing support point O2 below the first swing arm 30; This is supported by being tightened with a nut N through a support pin P2. Thus, the second swing arm 40 is extended and arranged in a direction deviated from the direction intersecting the tape pull-out direction X toward the tape pull-out direction, and is configured to be swingable around the second swing support point O2. A cutter C is disposed at the center, and is urged (tensile force) in the tape drawing direction X by a tension spring B2 having a biasing force F2 smaller than the biasing force F1 of the compression spring B1, and resists the biasing force F2 of the tension spring B2. Thus, it is configured to be swingable in the anti-tape drawing direction Y. The rotation angle of the second swing arm 40 in the tape pull-out direction X is regulated by the protrusions e and f provided on the inner surfaces of the flange plates 30A and 30B of the first swing arm 30, and both ends of the tension spring B2. Is connected to the back surface of the second swing arm 40 and the outer surface of the frame body 1F with a screw or the like, and biases (tensile force) between them.

  A base portion CO of the cutter C bent into an L shape is attached to the upper surface of the holding plate 40C connecting the flange plates 40A and 40B of the second swing arm 40 with screws or the like. The cutter C is alternately provided with triangular cutting edges C1 provided forward and triangular cutting edges C2 directed upward at an angle of approximately 90 °. Thus, the tape is cut with the cutting blade C2 which is pierced by the cutting blade C1 and directed upward, and the tape cutting edge 10C is held by the cutting blade C2. Further, the front surface C3 of the cutter C presses the back surface of the folded tape against the tape pressing portion 1E, and the convex portions g and h provided on the inner surfaces of the flange plates 40A and 40B serve to bend the tape when the tape is bent. Further, since the tape guide width W1 is set slightly wider than the tape width W, the protrusions i and j are provided on the inner surfaces of the end faces of the flange plates 40A and 40B of the second swing arm 40, and only the front end portion of the tape guide width W1. The same dimensions as the tape width W are set. This is to prevent twisting of the tape when it enters the tape guide.

  Thus, the tape cutter 100 pulls out the leading end portion 10B of the wound adhesive tape 10, cuts it with the cutting edge C2 of the cutter C of the second swing arm 40, and the tape cutting edge 10C is held by the cutting edge C2. In this state, the second swing arm 40 is first refracted downward against the tension spring B2, the tip of the tape is bent toward the adhesive surface side, and the second swing arm 40 is moved by a stronger refracting operation. When the first swing arm 30 is interlocked and refracted, and the front surface C3 of the cutter C is pressed against the tape pressing portion 1E of the main body 1, a non-adhesive portion 10D is formed at the tip of the tape.

  A tape mounting method based on the above configuration will be described with reference to FIGS. In order to attach the wound adhesive tape 10 to the cylindrical core portion 1A, the tail end of the tape cover 20 is lifted upward so as to be separated from the cylindrical core portion 1A and attached. Since the tape cover 20 is a leaf spring after the tape is mounted, the inner surface of the tail end comes into contact with the outer peripheral surface of the tape by the restoring force, and the tape width restricting portion 20H is positioned on the side surface of the tape. Prevents the wound adhesive tape from falling off.

  Next, the tape cutting method will be described with reference to FIGS. First, the worker's right hand HR grasps the cylindrical core portion 1A of the main body 1 and the tape cover 20 at the same time, grips the tip 10B of the tape 10A with the left hand HL, and pulls it out of the cylindrical core portion 1A. Then, it guides to the cutter C through between the guide roller 2R and the tape guides 1C and 1D. Here, the tip 10B of the tape 10A is pulled upward, first pierced into the cutting edge C1, and then pulled while being bent toward the cutting edge C2, whereby the tape is completely cut by the cutting edge C2.

Next, a method of forming the non-adhesive portion (peeling allowance) 10H at the tip end portion of the tape will be described with reference to FIGS. When the tape is cut by the cutter C, the cutting edge C2 of the cutter C holds the tape cutting edge 10C, so that the second swing arm 40 is bent in the anti-tape pulling direction Y with the left hand HL. Then, the tape tip is bent toward the adhesive surface. The second swing arm 40 is refracted against the compression spring B1 of the first swing arm 30 by a stronger refraction operation, and the front surface C3 of the cutter C of the second swing arm 40 is used as the tape pressing portion 1E of the main body 1. When pressed, a non-adhesive portion 10D is formed at the tape tip portion 10B.
After that, when the left hand HL is released from the second swing arm 40, the second swing arm 40 and the first swing arm 30 are restored in the tape drawing direction X by the restoring action of the compression spring B1 and the tension spring B2. The non-adhesive portion 10D protrudes forward.

  Further, a method of forming the non-adhesive portion (peeling allowance) 10D at the tape front end portion using the side wall or the like of the cardboard box DB will be described with reference to FIGS. Instead of pushing the second swing arm 40 with the left hand HL, the tip of the second swing arm 40 of the tape cutter 100 held in the right hand HR is pushed into the side wall of the cardboard box DB without using the left hand HL. This is done by refracting. The procedure is performed as shown in FIG. 25, pressing in FIG. 26, and releasing in FIG.

  An example in which the upper lids F3 and F4 of the cardboard box DB are closed by the tape cutter 100 will be described. As shown in FIG. 30, when a tape is stuck on the upper lids F3 and F4 of the cardboard box DB, the non-adhesive portion (peeling allowance) 10D of the tape is picked and drawn downward, and the tip thereof is the side surface portion S1 of the cardboard box DB. Paste to. Then, the upper lids F3 and F4 of the cardboard box DB are pasted, the opposite ends of the upper lids F3 and F4 are pulled out to a slightly protruding position, cut and pasted on the opposite side surface portion S2. On the other hand, when unpacking the upper lid of the cardboard box, the tape can be easily peeled from the upper lids F3 and F4 by picking the non-adhesive portion (peeling allowance) 10D of the tape by hand and pulling it up.

  The tape cutter 100 according to the embodiment of the present invention has the following effects. Since the tip of the tape attached to the cutter can be folded back and the non-adhesive part (peeling allowance) can be easily created with a simple operation, the stripping allowance shown in FIG. In particular, when the transparent tape is pulled out, the failure as shown in FIG. 29B, in which the tape is not peeled off uniformly on the cut line of the tape, is eliminated.

Also, when unpacking a cardboard box or the like that has been packed with a tape that has been made a stripping allowance, the tape can be peeled off instantaneously without leaving any tape in the cardboard box or the like.
Also, as an example, it is convenient to put an invoice in an envelope and stick it on the side of the cardboard box when shipping the cardboard box (FIG. 30).

  The present invention is not limited to the first embodiment described above, and it is needless to say that the design can be appropriately changed within the gist of the invention.

  The tape cutter 100 of the present invention has been described with respect to a tape cutter that attaches an upper lid of a cardboard box with a packing tape. However, the present invention is not limited to this, and can also be applied to an ordinary office adhesive tape.

DESCRIPTION OF SYMBOLS 1 Main body 1A Cylindrical core part 1B Tape feeding part 1C, 1D Tape guide 1E Tape holding | maintenance part 1F Frame body 1G, 1H Plate 2R Guide roller 10 Rolling adhesive tape 10A Tape 10B Tape front-end | tip part 10C Tape cutting edge 10D Non-adhesive Department (peeling off)
20 Tape cover 20H Tape width regulating portion 30 First swing arm 30A, 30B Cover plate 30C Holding plate 31 Cover 40 Second swing arm 40A, 40B Cover plate 40C Holding plate aj Convex portion B1 First elastic member (compression Spring)
B2 Second elastic member (tensile spring)
C Cutter CO Cutter base C1, C2 Cutter cutting edge C3 Cutter front DB Corrugated box F1 First elastic member (compression spring) urging force F2 Second elastic member (tensile spring) urging force F3, F4 Upper lid N of cardboard box N Nut H1 H5 Support hole HR Right hand HL Left hand O1 First swing fulcrum O2 Second swing fulcrum P1-P3 Support pins S1, S2 Side face W of cardboard box Tape width W1 Tape guide width X Tape pull-out direction Y Anti-tape pull-out direction 100 Tape cutter

Claims (2)

A cylindrical core that pivotably supports the wound adhesive tape is projected at the right end, a tape cover that holds the wound adhesive tape is placed on the upper left side, and both end positions of the tape fed out from the wound adhesive tape are located below The tape guide is placed at the front of the lower part of the tape guide so that it can contact the front of the cutter. A main body in which a guide roller for regulating the position is rotatably arranged by a support pin;
Extending from the first swing fulcrum at the top of the main body in a direction intersecting the tape pull-out direction, configured to be swingable around the first swing fulcrum, and biased in the tape pull-out direction by the first elastic member; A first swinging arm configured to be swingable in an anti-tape pulling direction against the biasing force of the first elastic member, and having a cover disposed above;
Extending from the second swing fulcrum of the lower portion of the first swing arm in a direction deviating toward the tape pull-out direction from the direction intersecting the tape pull-out direction, and configured to swing around the second swing fulcrum. The cutter is disposed in the center, and is biased in the tape pull-out direction by the second elastic member having a smaller elastic force than the first elastic member, and swings in the anti-tape pull-out direction against the biasing force of the second elastic member. A second swing arm configured to be movable,
Pull out the tip of the wound adhesive tape, cut the tape against the cutter of the second swing arm, hold the tape at the tip of the cutter, and first resist the second swing arm against the second elastic member. Then, refracting downward, bending the tape tip toward the adhesive surface, the second oscillating arm refracts the first oscillating arm in an even stronger refracting operation, and presses the front of the cutter against the tape pressing part of the main body. A non-adhesive portion is formed at the tip of the tape.   2. The tape cutter according to claim 1, wherein the cutter is provided with cutting edges provided toward the front and cutting edges directed upward at an angle of approximately 90 [deg.].

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