CN210651009U

CN210651009U - Cutting device

Info

Publication number: CN210651009U
Application number: CN201921612254.3U
Authority: CN
Inventors: 马荣梅; 李立鹏; 胡勇; 蔡君义; 李攀攀; 阳如坤; 魏宏生
Original assignee: Shenzhen Geesun Intelligent Technology Co Ltd
Current assignee: Shenzhen Geesun Intelligent Technology Co Ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2020-06-02
Anticipated expiration: 2029-09-25

Abstract

The utility model provides a cutting tool. The cutting equipment comprises a movable cutter and a fixed cutter; the fixed cutter comprises a fixed cutter frame and a fixed cutter arranged on the fixed cutter frame, the movable cutter comprises a first body and a plurality of first blades connected with the first body, the plurality of first blades can be replaced and used, the fixed cutter comprises a second body and a plurality of second blades connected with the second body, and the plurality of second blades can be replaced and used; the movable cutter comprises a movable cutter frame and a movable cutter arranged on the movable cutter frame. The utility model discloses a cutting equipment is through all setting up a plurality of cutting edges on activity sword and stationary knife, after a cutting edge wearing and tearing, continues work to another cutting edge through simply changing, carries out tool changing and cutter coping again after all cutting edges all wear and tear, compares with current pole piece cutting equipment, the utility model discloses can show and promote complete machine efficiency, reduce artifical maintenance cost and cutter administrative cost.

Description

Cutting device

Technical Field

The utility model relates to a cutting tool field especially relates to a cutting tool.

Background

The process flow of the lithium ion battery at present is generally divided into the following contents: homogenizing → coating → rolling → cutting → flaking → making electric core → filling shell → injecting liquid → forming → grading, etc. The process section for manufacturing the battery core requires that strip-shaped cathode sheet materials and anode sheet materials are cut into sheet materials with certain sizes meeting the battery process. The phenomenon of cutter wearing and tearing can appear in the cutting process, and cutter wearing and tearing can lead to burr increase, dust increase when the pole piece cuts. Excessive burrs and excessive dust can cause the short circuit rate of the battery cell to rise, so the cutting quality of the pole piece is strictly controlled by the technological requirement of the battery, and the grinding is required to be replaced after the cutter is worn to a certain degree. The existing pole piece cutting equipment is single-blade and single-edge at present, namely, only one cutting edge is arranged on one cutting tool, so that the cutting tool needs to be frequently replaced and repaired, the efficiency of the whole machine is reduced due to frequent replacement and repair of the cutting tool, and the manual maintenance cost is increased.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at overcoming the not enough among the prior art, provide a cutting equipment.

The utility model provides a following technical scheme:

a cutting device comprises a movable cutter and a fixed cutter;

the movable cutter comprises a movable cutter frame and a movable cutter arranged on the movable cutter frame, the movable cutter comprises a first body and a plurality of first blades connected with the first body, and the first blades can be replaced for use;

the fixed cutter comprises a fixed cutter frame and a fixed cutter arranged on the fixed cutter frame, the fixed cutter comprises a second body and a plurality of second cutting edges connected with the second body, and the second cutting edges can be replaced for use.

In some embodiments, the number of the first blades in the movable blade is two, the first body is a cylinder, and the first body has a first upper bottom surface and a first lower bottom surface which are oppositely arranged, wherein one first blade is connected to the first upper bottom surface of the first body, and the other first blade is connected to the first lower bottom surface of the first body.

In some embodiments, two first cutting edges correspond to two opposite sides of the first upper bottom surface and the first lower bottom surface respectively, or two first cutting edges correspond to the same side of the first upper bottom surface and the first lower bottom surface.

In some embodiments, in the fixed blade, the second body is a cylinder, the second body has an upper end and a lower end which are oppositely arranged, top surfaces of the upper end and the lower end are a second upper bottom surface and a second lower bottom surface respectively, each second blade is connected to the upper end or the lower end of the second body, and one side surface of each second blade is flush with the second upper bottom surface or the second lower bottom surface of the second body.

In some embodiments, the number of the second cutting edges in the fixed knife is two, wherein one second cutting edge is connected to the upper end of the second body, and the other second cutting edge is connected to the lower end of the second body.

In some embodiments, the two second cutting edges correspond to two opposite sides of the second upper bottom surface and the second lower bottom surface, respectively, or the two second cutting edges correspond to the same side of the second upper bottom surface and the second lower bottom surface.

In some embodiments, the cutting apparatus further comprises a drive mechanism for driving movement of the movable cutter.

In some embodiments, the surface of the stationary blade holder that is used to carry the material to be cut is flush with the surface of the stationary blade that is used to carry the material to be cut.

In some embodiments, the movable blade and the stationary blade are a unitary blade or a mosaic blade.

In some embodiments, the stationary blade carrier and the stationary blade are secured together by a fastener, and the movable blade carrier and the movable blade are secured together by a fastener.

The embodiment of the utility model has the following advantage:

the utility model discloses a cutting equipment is through all setting up a plurality of cutting edges on activity sword and stationary knife, after a cutting edge wearing and tearing, continues work to another cutting edge through simply changing, carries out tool changing and cutter coping again after all cutting edges all wear and tear, compares with current pole piece cutting equipment, the utility model discloses can show and promote complete machine efficiency, reduce artifical maintenance cost and cutter administrative cost.

In order to make the aforementioned and other objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a cutting apparatus according to embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of a cutting apparatus according to embodiment 2 of the present invention;

fig. 3 is a schematic structural diagram of a cutting apparatus according to embodiment 3 of the present invention;

fig. 4 is a schematic structural diagram of a cutting apparatus according to embodiment 4 of the present invention;

FIG. 5A is a schematic front view of a first embodiment of a movable knife in the cutting apparatus of the present invention;

FIG. 5B is a schematic perspective view of a movable knife of the cutting device according to the first embodiment of the present invention;

FIG. 6A is a schematic front view of a movable knife in the cutting apparatus according to the second embodiment of the present invention;

FIG. 6B is a schematic perspective view of a movable knife of the cutting device according to the present invention;

FIG. 7A is a schematic front view of a first embodiment of a stationary knife in the cutting apparatus of the present invention;

FIG. 7B is a schematic perspective view of a fixed knife of the cutting device according to the first embodiment of the present invention;

FIG. 8A is a schematic front view of a second embodiment of a stationary knife in the cutting apparatus of the present invention;

fig. 8B is a schematic perspective view of a fixed knife in the cutting device according to the second embodiment of the present invention.

Description of the main element symbols:

10. fixing a cutter; 11. fixing a tool rest; 12. fixing a knife; 121. a second body; 122. a second blade; 52. a second through hole; 20. a movable cutter; 21. a movable tool rest; 22. a movable knife; 221. a first body; 222. a first blade; 51. a first via.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It is worth mentioning that, in the present invention, the "plurality" means two or more than two.

Referring to fig. 1 to 8B, the present invention provides a cutting device, which includes a movable cutter 20 and a fixed cutter 10;

the movable cutter 20 comprises a movable cutter frame 21 and a movable cutter 22 mounted on the movable cutter frame 21, the movable cutter 22 comprises a first body 221 and a plurality of first cutter edges 222 connected with the first body 221, and the plurality of first cutter edges 222 can be replaced for use;

the fixed cutting tool 10 includes a fixed tool holder 11 and a fixed blade 12 mounted on the fixed tool holder 11, the fixed blade 12 includes a second body 121 and a plurality of second cutting edges 122 connected to the second body 121, and the plurality of second cutting edges 122 can be replaced for use.

Specifically, the utility model discloses a cutting equipment is applicable to and cuts slice or banded material such as pole piece (negative pole piece or positive pole piece).

Specifically, as shown in fig. 1 to 4, when the cutting device cuts the pole piece, the pole piece is supported on the top surface of the fixed cutter 10, the movable knife 22 is located above the fixed knife 12, and is used for executing the first cutting edge 222 and the second cutting edge 122 mutually perpendicular (the first cutting edge 222 is vertical, the second cutting edge 122 is horizontal) of the cutting action, the position of the fixed knife 12 is kept still, the movable knife 22 moves (i.e. moves downwards) from far to near to the fixed knife 12, so as to realize the cutting of the pole piece, and after the cutting is completed, the movable knife 22 returns (i.e. moves upwards) to the original position.

The first blade 222 of the stationary knife 12 functions to: first, the edge of the first blade 222 is aligned with the tip of the second blade 122, defining the cutting position of the pole piece; secondly, a clearance space is formed below the first blade 222, the second blade 122 may shift left and right in the downward movement process and the downward and upward movement processes, and the clearance space can provide a buffer space for the left and right movement of the second blade 122, so as to prevent the second blade 122 from colliding with the fixed knife 12 to damage the knife; thirdly, in the case that the top surface of the first blade 222 is flush with the top surface of the first body 221, the top surface of the fixed cutter 10 can be a stage for stably supporting the pole piece, thereby ensuring the cutting effect.

It can be understood that after the cutting operation is performed for a long time, the first blade 222 and the second blade 122 often rub against each other and rub against the material to be cut, so that the first blade 222 and the second blade 122 are worn to various degrees, the first blade 222 is easily worn to have problems of poor cutting effect (for example, burrs and burrs) and low cutting efficiency, the second blade 122 may have problems of irregular edge and uneven top surface of the blade after being worn, the second blade 122 may have irregular edge, and the material to be cut is easily not stably supported when the top surface of the second blade 122 is uneven, thereby causing poor cutting effect.

In the conventional cutting device, the movable knife 22 has only one second blade 122, and the fixed knife 12 has only one first blade 222, so when the second blade 122 and the first blade 222 are worn, the movable knife 22 and the fixed knife 12 need to be replaced and repaired, which results in higher manual maintenance cost and knife management cost.

The utility model discloses a cutting equipment is through all setting up a plurality of cutting edges on movable sword 22 and stationary knife 12, after a cutting edge wearing and tearing, continues work to another cutting edge through simply changing, carries out tool changing and cutter coping again after all cutting edges all wear and tear, compares with current pole piece cutting equipment, the utility model discloses can show promotion complete machine efficiency, reduce manual maintenance cost and cutter administrative cost.

Preferably, the plurality of first blades 222 in the fixed knife 12 have the same size, shape and material, and the plurality of second blades 122 in the movable knife 22 have the same size, shape and material, so as to ensure uniform cutting effect after blade replacement.

As shown in fig. 1-8B, in some embodiments of the present invention, the number of the first cutting edges 222 of the stationary knife 12 is two, and the number of the second cutting edges 122 of the movable knife 22 is two.

Optionally, the first body 221 and the second body 121 are both cylinders, because the cylinders are regular in shape, the shape of the cylinders cannot be changed greatly after the cylinders are turned up and down, left and right, and it is ensured that the mounting surfaces of the cutters are uniform when the blades are replaced.

Optionally, the column is a prism or a cylinder, and for convenience of installation, preferably, the column is a prism, especially a prism with a rectangular (including square) cross section.

As shown in fig. 5A, 5B, 6A, and 6B, in some embodiments of the present invention, in the movable blade 22, the number of the first blades 222 is two, the first body 221 is a cylinder, the first body 221 has a first upper bottom surface and a first lower bottom surface which are opposite to each other, one of the first blades 222 is connected to the first upper bottom surface of the first body 221, and the other first blade 222 is connected to the first lower bottom surface of the first body 221.

Fig. 5A is a front view of the first embodiment of the movable blade 22, and fig. 5B is a perspective view of the first embodiment of the movable blade 22, as shown in fig. 5A and 5B, in the first embodiment, two first cutting edges 222 respectively correspond to two opposite sides of the first upper bottom surface and the first lower bottom surface.

In the case of using the movable blade 22 according to the first embodiment, when one of the first blade edges 222 is worn to be unusable, the movable blade 22 is detached from the movable blade holder 21, turned upside down and left and right based on the direction in which the movable blade 22 is attached, and the movable blade 22 is reattached to the movable blade holder 21 in the turned direction.

Preferably, in the first embodiment, the first body 221 is a rectangular parallelepiped, and each of the two first blades 222 has a blade surface flush with two opposite side surfaces of the first body 221, and the blade surface is flush with the side surfaces of the body, so that the integrity of the blade and the body can be improved, and the mechanical strength of the blade can be further improved.

Preferably, after the movable knife 22 is turned by 360 degrees, the structure and shape are identical to those before turning.

Fig. 6A is a front view of a second embodiment of the movable blade 22, and fig. 6B is a perspective view of the second embodiment of the movable blade 22, as shown in fig. 6A and 6B, in which two first cutting edges 222 correspond to the same side of the first upper bottom surface and the first lower bottom surface.

When the movable knife 22 of the second embodiment is used, when one of the first knife edges 222 is worn to be unusable, the movable knife 22 is detached from the movable knife holder 21, turned upside down based on the direction in which it was attached, and the movable knife 22 is reattached to the movable knife holder 21 in the turned direction.

Preferably, in the first embodiment, the first body 221 is a rectangular parallelepiped, and each of the two first blades 222 has a blade surface flush with the same side surface of the first body 221.

Preferably, after the movable knife 22 is turned by 180 degrees, the structure and shape are identical to those before turning.

As shown in fig. 7A, 7B, 8A, and 8B, in some embodiments of the present invention, in the stationary knife 12, the second body 121 is a cylinder, the second body 121 has an upper end and a lower end which are oppositely disposed, top surfaces of the upper end and the lower end are a second upper bottom surface and a second lower bottom surface, respectively, each second blade 122 is connected to the upper end or the lower end of the second body 121, and a side surface of the second blade 122 is flush with the second upper bottom surface or the second lower bottom surface of the second body 121.

In some embodiments of the present invention, in the fixed knife 12, the number of the second cutting edges 122 is two, one of the second cutting edges 122 is connected to the upper end portion of the second body 121, and the other second cutting edge 122 is connected to the lower end portion of the second body 121.

Fig. 7A is a front view of the first embodiment of the fixed blade 12, and fig. 7B is a perspective view of the first embodiment of the fixed blade 12, as shown in fig. 7A and 7B, in the first embodiment, two second blades 122 respectively correspond to two opposite sides of the second upper bottom surface and the second lower bottom surface.

When the fixed blade 12 of the first embodiment is used, when one of the second cutting edges 122 is worn to be unusable, the fixed blade 12 is detached from the fixed blade holder 11, and then turned upside down and left and right based on the direction in which it was attached, and the fixed blade 12 is reattached to the fixed blade holder 11 in the turned direction.

Preferably, after the fixed blade 12 is turned by 360 degrees, the structure and shape of the fixed blade are completely the same as those before turning.

Fig. 8A is a front view of the first embodiment of the fixed blade 12, and fig. 8B is a perspective view of the first embodiment of the fixed blade 12, in which the two second cutting edges 122 correspond to the same side of the second upper bottom surface and the second lower bottom surface.

When the fixed blade 12 of the second embodiment is used, when one of the second cutting edges 122 is worn to be unusable, the fixed blade 12 is detached from the fixed blade holder 11, turned upside down based on the direction in which it was attached, and the fixed blade 12 is reattached to the fixed blade holder 11 in the turned direction.

Preferably, after the fixed blade 12 is turned by 180 degrees, the structure and shape are completely the same as those before turning.

Optionally, the cutting device of the present invention further comprises a driving mechanism for driving the movable cutter 20 to move. The driving mechanism can drive the movable cutter 20 to move towards the fixed cutter 10 to perform a cutting action, and can also drive the movable cutter 20 to move back to the original position after the cutting is finished, that is, the driving mechanism can drive the fixed cutter 10 to perform a reciprocating action.

Preferably, the surface of the fixed tool holder 11 for bearing the material to be cut is flush with the surface of the fixed tool 10 for bearing the material to be cut, so that the fixed tool 10 and the fixed tool 10 together form a bearing table for the material to be cut.

Specifically, the movable knife 22 and the fixed knife 12 may be an integral knife (also called a solid knife) or a mosaic knife.

Alternatively, the fixed blade holder 11 and the fixed blade 12 are fixed together by a fastener, and the movable blade holder 21 and the movable blade 22 are fixed together by a fastener.

In some embodiments, the fastener comprises a bolt and a nut.

As shown in fig. 7B and 8B, the fixed blade 12 is provided with a plurality of second through holes 52, so that the fixed blade 12 and the fixed blade holder 11 can be fixedly connected through bolts. As shown in fig. 5B and fig. 6B, a plurality of first through holes 51 are formed in the movable knife 22, so that the movable knife 22 and the movable knife rest 21 are fixedly connected through bolts.

Based on the cutting equipment, the utility model also provides a cutting method adopts above-mentioned cutting equipment to treat the material that cuts and cuts, has the tangent plane and levels, cuts advantage such as efficient, with low costs.

Specifically, the material to be cut is a sheet material or a strip material, such as a cathode sheet material or an anode sheet material of a lithium battery.

Example 1

Referring to fig. 1, a cutting apparatus includes a movable cutter 20 and a fixed cutter 10;

the movable cutter 20 comprises a movable cutter frame 21 and a movable cutter 22 mounted on the movable cutter frame 21, the movable cutter 22 comprises a first body 221 and two first cutter edges 222 connected with the first body 221, and the two first cutter edges 222 can be replaced for use;

the fixed cutting tool 10 includes a fixed tool holder 11 and a fixed blade 12 mounted on the fixed tool holder 11, and the fixed blade 12 includes a second body 121 and two second cutting edges 122 connected to the second body 121, and the two second cutting edges 122 can be replaced for use.

In the stationary knife 12:

the second body 121 is a rectangular parallelepiped, the second body 121 has an upper end and a lower end which are oppositely arranged, top surfaces of the upper end and the lower end are a second upper bottom surface and a second lower bottom surface respectively, each second blade 122 is vertically connected to the upper end or the lower end of the second body 121, and one side surface of each second blade 122 is flush with the second upper bottom surface or the second lower bottom surface of the second body 121;

one of the second blades 122 is connected to the upper end of the second body 121, and the other second blade 122 is connected to the lower end of the second body 121; the two second blades 122 correspond to opposite sides of the second upper bottom surface and the second lower bottom surface, respectively.

In the movable knife 22:

the first body 221 is a rectangular parallelepiped, the first body 221 has a first upper bottom surface and a first lower bottom surface which are oppositely arranged, one first blade 222 is vertically connected to the first upper bottom surface of the first body 221, and the other first blade 222 is vertically connected to the first lower bottom surface of the first body 221; the two first blades 222 respectively correspond to two opposite sides of the first upper bottom surface and the first lower bottom surface; the two first cutting edges 222 each have a cutting edge surface flush with the two oppositely disposed side surfaces of the first body 221.

After the fixed knife 12 and the movable knife 22 are turned by 360 degrees, the structures and the shapes are completely the same as those before turning.

Example 2

Referring to fig. 2, compared with embodiment 1, the cutting apparatus has a different structure of the movable knife 22, which is characterized in that:

in the movable blade 22 of this embodiment 2, the two first blade edges 222 correspond to the same side of the first upper bottom surface and the first lower bottom surface.

After the movable knife 22 is turned by 180 degrees, the structure and shape are completely the same as those before turning.

Example 3

Referring to fig. 3, compared with embodiment 1, the structure of the fixed knife 12 is different in that:

in the fixed blade 12 of this embodiment 3, the two second cutting edges 122 correspond to the same side of the second upper bottom surface and the second lower bottom surface.

After the fixed knife 12 is turned over by 180 degrees, the structure and shape of the fixed knife are completely the same as those before turning over.

Example 4

Referring to fig. 4, compared with embodiment 1, the cutting device has different structures of the movable knife 22 and the fixed knife 12, and the differences are:

in the movable blade 22 of this embodiment 4, the two first blade edges 222 correspond to the same side of the first upper bottom surface and the first lower bottom surface;

in the fixed blade 12 of this embodiment 4, the two second cutting edges 122 correspond to the same side of the second upper bottom surface and the second lower bottom surface.

After the fixed knife 12 and the movable knife 22 are turned over by 180 degrees, the structures and the shapes of the fixed knife and the movable knife are completely the same as those before turning over.

In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The above-described embodiments are merely illustrative of several embodiments of the present invention, which are described in detail and specific, but not intended to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims

1. A cutting device comprises a movable cutter and a fixed cutter;

2. The cutting apparatus as claimed in claim 1, wherein the number of the first blades of the movable knife is two, the first body is a cylinder, the first body has a first upper bottom surface and a first lower bottom surface which are oppositely arranged, one of the first blades is connected to the first upper bottom surface of the first body, and the other first blade is connected to the first lower bottom surface of the first body.

3. The cutting apparatus as claimed in claim 2, wherein two first knife edges correspond to opposite sides of the first upper and lower base surfaces, respectively, or wherein two first knife edges correspond to the same side of the first upper and lower base surfaces.

4. The cutting apparatus as claimed in claim 1, wherein the second body of the fixed knife is a cylinder, the second body has an upper end portion and a lower end portion which are oppositely arranged, top surfaces of the upper end portion and the lower end portion are a second upper bottom surface and a second lower bottom surface respectively, each second blade is connected to the upper end portion or the lower end portion of the second body, and one side surface of the second blade is flush with the second upper bottom surface or the second lower bottom surface of the second body.

5. The cutting apparatus as claimed in claim 4, wherein the number of the second cutting edges in the fixed knife is two, one of the second cutting edges being connected to an upper end of the second body and the other second cutting edge being connected to a lower end of the second body.

6. The cutting apparatus as claimed in claim 5, wherein two second cutting edges correspond to opposite sides of the second upper and lower bottom surfaces, respectively, or wherein two second cutting edges correspond to the same side of the second upper and lower bottom surfaces.

7. The cutting apparatus of claim 1, further comprising a drive mechanism for driving movement of the movable cutter.

8. The cutting apparatus as claimed in claim 1, wherein the surface of the stationary blade holder for carrying the material to be cut is flush with the surface of the stationary blade holder for carrying the material to be cut.

9. The cutting apparatus as claimed in claim 1, wherein the movable and stationary knives are integral knives or mosaic knives.

10. The cutting apparatus as claimed in claim 1, wherein the stationary blade carrier and the stationary blade are secured together by a fastener, and the movable blade carrier and the movable blade are secured together by a fastener.