JP6111451B2 - Blade sharpness measuring device - Google Patents

Description

  The present invention is an improvement of a sharpness measuring device for a blade, and more specifically, the sharpness of a blade can be measured more accurately than before, and even when the sharpness of a plurality of blades is sequentially measured, the measurement operation can be performed quickly and efficiently. The present invention relates to a sharpness measuring device for a blade that can be used automatically.

  In general, when evaluating the sharpness of a knife such as a knife, a Honda type sharpness tester (see Non-Patent Document 1) that can quantitatively evaluate the sharpness based on the number of paper cuts, or an ISO-compliant tester. Is used (see Non-Patent Document 2). In these testing machines, a paper bundle is placed on the cutting edge of the blade set upward with a constant load, and the blade or paper bundle is reciprocated in this state to measure the number of sheets cut or the cutting depth. Measure with

  However, in the initial sharpness tester, when fixing the blade with the vice mechanism, it is necessary to operate the handle of the vice mechanism with the opposite hand while holding the blade with one hand and keeping the blade horizontal at a predetermined position. Therefore, when the movable body of the vice mechanism comes into contact with the blade part, the hand on the side holding the blade may be shaken up and down by the impact, and the blade tip may be slightly tilted.

  For this reason, when comparatively evaluating the sharpness of a plurality of blades of different materials, shapes, etc., it has been difficult to perform an accurate evaluation due to a level of error that cannot be ignored in the measurement results of the blades. In addition, since the early test machines also had poor reproducibility of measurement results, it was necessary to collect a large amount of measurement data by repeatedly performing tests on the same type of blade in order to perform more accurate evaluation.

  Therefore, in the past, a technology has been developed in which a plurality of support pins for mounting the blade are provided in the vise mechanism of the sharpness testing machine, and the blade part before fixing is held at a predetermined height and angle by the support pins. ing. In this technique, the arrangement of the support pins can be changed according to the ridge shape of the blade by changing the insertion position into the dowel holes arranged in the vertical direction.

  However, even when the vice mechanism is adopted, the position of each support pin can be adjusted only stepwise, and therefore the blade edge cannot be kept horizontal unless the blade has a matching pin shape and peak shape. In addition, two types of blades with slightly different peak shapes had to be fixed with the same arrangement of support pins, so that the comparative evaluation was likely to be inaccurate.

  Furthermore, with regard to the conventional vise mechanism provided with the support pin, each time the blade to be fixed is replaced with a blade having a different peak shape or thickness, the support pin is repeatedly arranged so that the blade edge becomes horizontal in accordance with the blade to be replaced. Since it was necessary to adjust the position, it took a lot of time for the preparation work before driving the apparatus, and the measurement work could not be performed quickly.

“Tohoku University Institute of Materials Research 120th Kinken Lecture Memorial Calendar”, [online], 2010 Pension Research Institute Executive Committee, [February 8, 2013 search], Internet <URL: http: / /www.imr.tohoku.ac.jp/ge/public_data/archive/120th_lecture.pdf> “KNIFE & BLADE CUTTING TEST MACHINE”, [online], CATRA (the Cutlery and Allied Trades Research Association), [February 8, 2012 search], Internet <URL: http://www.catra.org/pages /products/kniveslevel1/slt.htm>

  Therefore, the present invention has been made in view of the above problems, and the object of the present invention is to accurately measure the sharpness of the blade even when the peak shape and thickness are different, and a plurality of An object of the present invention is to provide a sharpness measuring device with excellent functionality capable of quickly performing preparatory work before measurement when sequentially measuring the sharpness of a blade.

  Means employed by the present inventor for solving the above-described problems will be described with reference to the accompanying drawings.

That is, the present invention relates to a vise mechanism 1 that can be fixed by sandwiching the blade part of the blade B from the left and right with the blade tip facing upward; a sample that is disposed above the vice mechanism 1 and is a workpiece to be cut A sample fixing portion 2 capable of fixing S; a support mechanism 3 that supports the sample fixing portion 2 on the vice mechanism 1 so as to be movable up and down; 4; a reciprocating drive mechanism 5 for reciprocating the vice mechanism 1 in the front-rear direction by a drive source 51, a power transmission mechanism 52, and a slide guide 53; and controlling the reciprocating drive mechanism 5 based on input setting data. Comprising the control device 6 to perform the above-mentioned knife sharpness measuring device,
With the blade portion fixed to the vice mechanism 1, the inclination of the vise mechanism 1 can be adjusted by the vise angle adjusting mechanism 4 so that the portion of the blade tip that contacts the sample S is almost horizontal. is there.

  In addition, with respect to the sample fixing portion 2, the load received by the blade edge when the sample S is lowered can be adjusted by attaching the weight member 25.

  The vise angle adjusting mechanism 4 has the vise mechanism 1 mounted and fixed, and guide holes 41a and 41a are formed on one of the front and rear end faces, and a fixed support leg is formed on the lower side of the other side. A table 41 to which 42 is pivotally attached; a rod member 43, 43 slidably mounted in a guide hole 41a, 41a of the table 41; directly to the rod member 43, 43 or via a connecting bar member 44 And a movable support leg 45 which can be adjusted by raising and lowering or expanding and contracting the main body.

On the other hand, instead of the above-described device configuration, the blade sharpness measuring device is arranged above the vice mechanism 1 with a vise mechanism 1 that can be fixed by sandwiching the blade part of the blade B from the left and right with the blade tip facing upward; A sample fixing portion 2 that can fix the sample S to be cut; a support mechanism 3 that supports the sample fixing portion 2 on the vise mechanism 1 so as to be movable up and down; and drives the vise mechanism 1 A reciprocating drive mechanism 5 that reciprocates in the front-rear direction by a power source 51, a power transmission mechanism 52, and a slide guide 53; and a control device 6 that controls the reciprocating drive mechanism based on input setting data.
Furthermore, if the vise mechanism 1 is structured to include a pair of movable bodies 11 and 11 that move symmetrically about the position immediately below the sample S set in the sample fixing portion 2, the thickness of the blade portion of the blade B is determined. The position of the blade edge can be accurately placed directly below the sample S regardless of the above.

  In the present invention, in the blade sharpness measuring device, by providing a vise angle adjusting mechanism capable of adjusting the inclination of the vice mechanism, the blade edge of the blade is leveled together with the vice mechanism in a state where the blade part of the blade is fixed to the vice mechanism. Since it can be adjusted, the cutting edge can be set horizontally without causing camera shake or the like.

  In addition, since the vise angle adjustment mechanism allows the inclination of the vise mechanism to be adjusted in a stepless manner, the blade edge angle can be accurately adjusted regardless of the shape of the blade (ridge shape, blade width, etc.). Even when comparatively evaluating the sharpness of two types of blades with slightly different shapes, accurate evaluation without error can be performed.

  Further, the vise angle adjusting mechanism does not need to adjust the position of the support pin or the like, and can adjust the inclination of the cutting edge angle quickly because the inclination of the vice mechanism can be adjusted while directly looking at the cutting edge. . As a result, even when the sharpness of a large number of blades is sequentially measured, the measurement work can be efficiently advanced.

  Therefore, according to the present invention, it is possible not only to obtain accurate measurement data on the sharpness of the blade, but also to provide an instrument for measuring the sharpness of the blade excellent in functionality capable of improving the efficiency of the measurement work. The value is high.

It is a whole perspective view showing the sharpness measuring device in Example 1 of the present invention. It is sectional drawing which cut | disconnected only the movable body and the blade for demonstrating the structure of the vice mechanism in Example 1 of this invention. It is sectional drawing which cut | disconnected only the movable body for demonstrating the structure of the vice mechanism in Example 1 of this invention. It is a whole front view showing the sharpness measuring apparatus in Example 1 of this invention. It is sectional drawing showing the structure of the sample fixing | fixed part in Example 1 of this invention. It is sectional drawing showing the structure of the sample fixing | fixed part in Example 1 of this invention. It is a state explanatory drawing showing the use condition of the weight member in Example 1 of the present invention. It is the side view, top view, and front view showing the vise angle adjustment mechanism in Example 1 of this invention. It is a state explanatory drawing showing the use condition of the vise angle adjustment mechanism in Example 1 of the present invention. It is the side view, top view, and front view showing the reciprocating drive mechanism in Example 1 of this invention. It is a state explanatory drawing showing the use state of the reciprocating drive mechanism in Example 1 of this invention. It is a graph which shows the measurement result performed using the sharpness measuring apparatus in Example 1 of this invention. It is the top view and front view showing the structure of the vice mechanism in Example 2 of this invention. It is a side view showing the structure of the vise mechanism in Example 2 of this invention.

“Example 1”
A first embodiment of the present invention will be described with reference to FIGS. In the figure, what is indicated by reference numeral 1 is a vise mechanism, and what is indicated by reference numeral 2 is a sample fixing portion. What is indicated by reference numeral 3 is a support mechanism, and what is indicated by reference numeral 4 is a vise angle adjusting mechanism. Also, what is indicated by reference numeral 5 is a reciprocating drive mechanism, and what is indicated by reference numeral 6 is a control device.

  First, in the first embodiment, a vise mechanism 1 is provided below the sharpness measuring device M as a blade fixing means (see FIG. 1). In addition, as shown in FIGS. 2A and 2B, the vice mechanism 1 is sandwiched between the movable bodies 11 and 11 from the left and right sides with the blade tip facing upward, and the cutter B (in this embodiment, the knife) Used) can be fixed.

  In the present embodiment, support pins 11a and 11a are provided before and after one movable body 11 of the vise mechanism 1, and the support pin 11a is provided when the other movable body 11 is closed on both movable bodies 11 and 11. Insertion holes 11b and 11b are provided so that the blade B can be fixed on the support pins 11a and 11a.

  In the present embodiment, the vise mechanism 1 is provided with a shaft 12 having a normal screw and a reverse screw cut on the left and right sides, and the movable bodies 11 and 11 are mounted on the screw portions of the shaft 12, respectively. Thus, when the handle portion 12a provided at one end of the shaft 12 is rotated, the movable bodies 11 and 11 can be simultaneously moved symmetrically.

  In this embodiment, the plate member 11c made of a synthetic resin that is softer than metal is used so that the blade part of the blade B does not break even if it is strongly tightened inside the movable bodies 11 and 11 of the vise mechanism 1. 11c is attached, and the blade B of the blade B is sandwiched between these plate-like members 11c and 11c so that the blade B having a blade part shorter than the movable bodies 11 and 11 can be stably fixed.

  Further, in this embodiment, as shown in FIGS. 3A and 3B, guide rods 13 and 13 are provided in front of and behind the vice mechanism 1 in parallel with the shaft 12, and the guide rods 13 and 13 are further connected to the bush. Since the movable bodies 11 and 11 are attached in a state of being inserted into the rod through holes 11d and 11d in which the interior is installed, the movable bodies 11 and 11 can be moved to the left and right while maintaining parallelism by operating one shaft 12. Can do.

  On the other hand, above the vice mechanism 1, a sample fixing unit 2 for fixing a sample S (a paper bundle in which several hundreds of thin papers are stacked in this embodiment) used as an object to be cut is disposed ( (See FIG. 4). The sample fixing unit 2 is attached to a support mechanism 3 that is provided laterally from a predetermined height of the apparatus housing F so as to be movable up and down, and can be moved up and down on the vice mechanism 1. .

  In the present embodiment, the vise mechanism 1 has a structure including a pair of movable bodies 11 and 11 that move symmetrically about the position immediately below the sample S set on the sample fixing unit 2. Regardless of the thickness of the blade portion, the position of the blade edge can be accurately placed directly under the sample S.

  Further, as shown in FIGS. 5 and 6, the sample fixing portion 2 is mounted on the suspension portions 21 and 21 for placing the sample S in a state of being spanned, and on the suspension portions 21 and 21. A structure is adopted that includes a pressing plate 22 that presses the sample S from above and an eccentric cam 23 that can press the pressing plate 22 downward by rotating the lever portion 23a.

  In this embodiment, since the rubber plate portion 22a deformed by an external force is provided at the lower portion of the holding plate 22, the sample is measured from the space between the rubber plate portion 22a pushed down without the sample S and the suspension portions 21 and 21. Even when the thickness of S is large, the sample S can be fixed by compressively deforming the rubber plate portion 22a. In this embodiment, the pressing plate 22 is integrated with the frame of the sample fixing portion 2 while being suspended by the spring members 22b and 22b, so that the pressing plate 22 is not required to be attached or detached.

  Furthermore, in this embodiment, two vertical rods 24 and 24 provided on the upper side of the suspension part 21 of the sample fixing part 2 are provided in guide holes 31a and 31a formed in the take-out type frame 31 of the support mechanism 3. The vertical rods 24 and 24 are inserted and slid up and down along the guide holes 31a and 31a. Thereby, it becomes possible to raise / lower the sample fixing | fixed part 2 to a perpendicular direction.

  In this embodiment, a dish-shaped weight member 25 is fixed on the upper side of the vertical rods 24, 24 of the sample fixing part 2 to prevent the sample fixing part 2 from falling off the support mechanism 3. When the sample S is lowered onto the blade B, the load received by the blade edge from the sample S can be adjusted by the weight of the weight member 25 using the weight member 25.

  In the present embodiment, since the weight member 25 of the sample fixing portion 2 has a dish shape, as shown in FIG. 7, the load amount is adjusted by stacking the dish-shaped weight members 25 having the elevated portions 25a. be able to. In addition, the weight can be adjusted by placing a weight such as a weight on the dish-shaped weight member 25 (not shown).

  Further, the support mechanism 3 is formed with an opening 32a into which a projection 26 provided on the frame of the sample fixing unit 2 can be inserted, and an arcuate locking hole 32b starting from the opening 32a. A body 32 is provided. Then, the rotating body 32 is operated by the rotary knob 32c, and the protrusion 26 is moved to the end of the locking hole 32b as shown in FIG. 5, so that the sample fixing part 2 can be prevented from falling.

  On the other hand, a vise angle adjusting mechanism 4 capable of adjusting the inclination steplessly is provided below the vise mechanism 1, and in this embodiment, the vise angle adjusting mechanism 4 is shown in FIGS. ), A table 41 for mounting and fixing the vice mechanism 1 and a fixed support leg 42 for fixing the rear end portion of the table 41 in a pivotal state are configured.

  Further, guide holes 41a and 41a are formed in the front end surface of the table 41, and rod members 43 and 43 are slidably mounted in the guide holes 41a and 41a. The rod members 43 and 43 are pivotally attached to the upper bar member 45a of the movable support leg 45 via the connecting bar member 44, and the body part of the movable support leg 45 is moved up and down by the height of the pivot attachment part. It can be adjusted by.

  Accordingly, as shown in FIG. 9, the blade edge of the blade B can be adjusted horizontally with the vice mechanism 1 in a state where the blade part of the blade B is fixed to the vice mechanism 1. Can be set horizontally. Thereby, it becomes possible to measure the sharpness of the blade B more accurately.

  In this embodiment, the fixed support leg 42 and the movable support leg 45 are provided on the base portion 46, and a pipe nut 47 is provided below the movable support leg 45, and can be moved by a bolt 48 inserted into the pipe nut 47. By tightening and fixing the support leg 45 from the side, the inclination of the table 41 can be adjusted steplessly.

  In this embodiment, a coil spring 45b is attached to the movable support leg 45 so that when the bolt 48 is loosened, the table 41 automatically returns to the original horizontal orientation. If the biasing force of the coil spring 45b is used, the angle adjustment work of the table 41 can be easily performed only by adjusting the force pressing the table 41 downward.

  On the other hand, a reciprocating drive mechanism 5 for reciprocating the vice mechanism 1 in the front-rear direction is provided on the apparatus substrate A at the lower part of the vise angle adjusting mechanism 4 as shown in FIGS. It is fixed. In the present embodiment, the reciprocating mechanism 5 includes a drive source 51 (drive motor), a power transmission mechanism 52 (such as a speed reducer 52a, a timing belt 52b, and a gear 52c), and slide guides 53 and 53. .

  Then, the power from the drive source 51 is transmitted by the power transmission mechanism 52 to the base portion 46 of the vise angle adjusting mechanism 4 slidably attached to the slide guides 53 and 53 of the reciprocating mechanism 5, and FIG. ) And (b), the base portion 46 can be reciprocated back and forth. This also allows the specimen S to be cut by moving the blade B fixed to the vice mechanism 1 back and forth.

  In this embodiment, as shown in FIGS. 10A and 10B, the proximity dog 46a is attached to the lower side of the base portion 46, while the proximity switch is provided between the left and right slide guides 53 and 53. The reciprocating motion mechanism 5 is arranged so that the moving direction of the base portion 46 is reversed when the proximity dogs 46a of the base portion 46 are detected by these proximity switches 54 and 54. Is designing.

  In this embodiment, the stroke distance (the distance by which the base portion 46 is moved in one direction) in the reciprocating mechanism 5 can be adjusted by operating the rotary handle 55 and changing the distance between the proximity switches 54 and 54. ing.

  The apparatus is also provided with a control device 6 for controlling the reciprocating drive mechanism 5 based on the input setting data (see FIG. 4). The cutter B can be reciprocated under the specified conditions (reciprocating speed, number of reciprocations, etc.) while pressing the sample S.

  Further, by incorporating a complicated control program in the control device 6, the reciprocating speed can be changed in the middle. In the present embodiment, the touch panel unit 61 serving as an input operation unit and a display unit for the number of times of reciprocation, the speed adjustment dial 62 for setting the reciprocating speed, and the activation of the reciprocating drive mechanism 5 are provided in front of the main body of the sharpness measuring device M. -A start / stop button 63 for operating the stop is provided (see FIG. 1).

  In this embodiment, the stroke distance (interval between the proximity switches 54 and 54) adjusted by the operation of the reciprocating rotary handle 55 of the reciprocating drive mechanism 5 is measured and transmitted to the control device 6 so as to be able to transmit the stroke distance. Can be displayed on the touch panel unit 61.

[Effectiveness test]
Next, the result of evaluating the sharpness of the knife using the sharpness measuring device M for the blade B is shown below. First, in this test, the sharpness evaluation test was performed by measuring the number of cut sheets of the paper bundle used as the sample S for the same lot of knives P and Q with the same material (iron-based alloy), shape (single blade), and manufacturing method. Went.

  The measurement conditions for this test are: the load applied to the cutting edge by the sample S is 10N, and the stroke distance for the reciprocating movement of the blade B is 30 mm (the width of the sample S is 10 mm. Is 40 mm), the speed at which the blade B is moved is 40 mm / second, and the number of reciprocations of the blade B is one.

  The measurement procedure of this test was performed as follows. First, the blade B is fixed to the vise mechanism 1, and the angle of the portion of the blade tip that contacts the sample S is adjusted horizontally by the vise angle adjusting mechanism 4, and the sample S is set on the suspension portion 21 of the sample fixing portion 2. This is fixed by the pressing plate 22 by operating the lever portion 23a. At this time, it is confirmed that the adjustment of the load by the weight member 25, the stroke distance, the reciprocating speed, and the number of reciprocations are in accordance with the measurement conditions.

  If the setting and measurement conditions are different when checking the stroke distance, the reciprocating speed, and the number of reciprocations, the rotary handle 55 of the reciprocating drive mechanism 5, the touch panel unit 61 of the control device 6, and the speed adjustment dial 62. Perform the reset operation to meet the measurement conditions.

  Thereafter, the rotary knob 32c of the support mechanism 3 is operated to unlock the sample fixing portion 2, and the sample fixing portion 2 is slowly lowered until the sample S touches the blade edge. Then, the start / stop switch 63 of the control device 6 is operated to start the drive source 51 of the reciprocating drive mechanism 5 to move the vise mechanism 1 to which the blade B is fixed back and forth.

  Finally, after confirming that the blade B has stopped, the sample fixing part 2 is lifted and fixed to the support mechanism 3 again, and then the lever part 23a is operated to loosen the presser plate 22, and the suspension part 21 The sample S is pulled out and the number of sheets cut is measured.

  In this test, as a result of repeating the above measurement, as shown in FIG. 12 (a), the number of cut knives P and Q of the same lot showed almost the same numerical value. In the graph of FIG. 12, the number of times the measurement is repeated is expressed as “number of times of cutting”. Further, when a test was performed on the cutter R having the same material as that of the cutter P and having a shape of a double-edged blade under the same conditions, the number of cut pieces was different from the measurement result of the knife P as shown in FIG. showed that. From the above results, it was confirmed that the sharpness of the blade B can be measured with high accuracy by this apparatus.

“Example 2”
Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, as shown in FIGS. 13 (a) and 13 (b), projecting members 11e and 11e are provided on the inner side of the movable bodies 11 and 11 of the vice mechanism 1 in the front-rear direction. The protruding members 11e and 11e are connected to the movable bodies 11 and 11 in a universal joint shape so that the angle can be adjusted according to the inclination of the blade side surface.

  Further, in this embodiment, as shown in FIG. 14, the concave portion is formed in the central portion of the movable body 11 where the front and rear protruding members 11e and 11e are not disposed, and therefore the blade B having a small blade width is formed. Even when the measurement is carried out with the vice mechanism 1 set, the cutting edge can be deeply cut into the sample S without bringing the sample S and the movable bodies 11 and 11 into contact with each other.

  The present invention is generally configured as described above. However, the present invention is not limited to the illustrated embodiment, and various modifications can be made within the description of “Claims”. The movable support leg 45 of the vise angle adjusting mechanism 4 may be an expansion / contraction mechanism such as a fluid pressure cylinder, or may be automatically adjusted using an actuator.

  Moreover, the kind of blade B which can be used with this apparatus can also measure the sharpness of not only a knife but a knife, a cutter, etc. In addition, regarding the sample S used as an object to be cut, the sharpness may be quantitatively evaluated by measuring the cutting depth using not only a bundle of paper but also a plastic piece, a piece of wood, or the like. It belongs to the technical scope of the present invention.

  In recent years, the technological development of knives such as knives has been activated, and a more accurate sharpness measuring device is required. Under such circumstances, the blade sharpness measuring device according to the present invention is a useful technique that can be used for research and development of high-performance blades in blade manufacturers, material manufacturers, public research institutions, etc. The industrial utility value is very high.

1 Vice mechanism
11 Movable body
11a Support pin
11b insertion hole
11c Plate member
11d Rod through hole
11e Protruding members
12 shaft
12a Handle part
13 Guide rod 2 Sample fixing part
21 Suspension
22 Presser plate
22a Rubber plate
22b Spring material
23 Eccentric cam
23a Lever part
24 Vertical rod section
25 Weight member
25a Height
26 Protrusion 3 Support mechanism
31 carry-out frame
31a Guide hole
32 Rotating body
32a opening
32b Locking hole
32c Rotary knob 4 Vise angle adjustment mechanism
41 tables
41a Guide hole
42 Fixed support legs
43 Rod member
44 Connecting bar material
45 Movable support legs
45a Upper bar material
45b coil spring
46 Base part
46a Proximity dog
47 Pipe nut
48 Volts 5 Reciprocating drive mechanism
51 Driving source
52 Power transmission mechanism
52a reducer
52b Timing belt
52c gear
53 Slide guide
54 Proximity switch
55 Rotating handle 6 Control device
61 Touch panel
62 Speed control dial
63 Start / stop button M Sharpness measuring device B Cutting tool S Sample F Device housing A Device substrate

Claims (3)

A vise mechanism (1) that can be fixed by sandwiching the blade part of the blade (B) from the left and right with the blade tip facing upward; a sample that is disposed above the vise mechanism (1) and that is a workpiece to be cut A sample fixing part (2) capable of fixing (S); a support mechanism (3) for supporting the sample fixing part (2) on the vice mechanism (1) so as to be movable up and down; A vise angle adjusting mechanism (4) capable of adjusting the inclination steplessly; and the vice mechanism (1) is reciprocated back and forth by a drive source (51), a power transmission mechanism (52) and a slide guide (53). A reciprocating drive mechanism (5); and a control device (6) for controlling the reciprocating drive mechanism (5) based on the inputted setting data,
With the blade portion fixed to the vice mechanism (1), the inclination of the vice mechanism (1) is adjusted by the vise angle adjusting mechanism (4) so that the portion of the blade tip that contacts the sample (S) is almost horizontal. A sharpness measuring device for a blade characterized by being adjustable.   The sharpness of the blade according to claim 1, wherein a weight member (25) for adjusting a load received by the blade edge when the sample (S) is lowered is attached to the sample fixing portion (2). measuring device.   The vise angle adjusting mechanism (4) is mounted and fixed to the vise mechanism (1), and has guide holes (41a) and (41a) formed on the end surface on either one of the front and rear sides and fixed to the lower part on the other side. A table (41) to which a support leg (42) is pivotally attached; a rod member (43) (43) slidably mounted in a guide hole (41a) (41a) of the table (41); A movable support leg (45) which is pivotally attached to the member (43) (43) directly or via a connecting bar member (44) and the height of the pivotally attached portion can be adjusted by raising or lowering or extending or contracting the main body The blade sharpness measuring device according to claim 1, wherein the blade sharpness measuring device is configured to include a blade.