Test strip cutting device for diagnostic kits

Abstract

The present invention has at least two concentric adjustment screws on the partition repeatedly inserted into the shaft and the adjustment nut fixing the blade. When the partition and the blade are fixed by the adjustment nut, the concentric adjustment screw is used to push the partition and the blade along the axial direction to implement concentric adjustment, thereby preventing the occurrence of defects and protecting the blade so that it can be used for a longer time. In particular, the present invention allows the shaft located on one side based on the diagnostic test paper to be elastically supported while adjusting the position in the opposite direction along its length. In addition, the edge of the face opposite to the face forming the blade edge in the partition forms a boss to provide extra space for shaking the blade, thereby adjusting the distance between the blade and the other shaft to prevent the cut test paper strip from being deformed and prevent the blade from being damaged.

Description

Technical Field

[0001] The present invention relates to a test strip cutting device for a diagnostic test kit that cuts a strip of diagnostic test paper into diagnostic test strips of a preset size. More specifically, an adjusting nut is locked and fixed on one side of an axis on which a plurality of blades and partitions are inserted, so as to facilitate cutting according to a certain width. The adjusting nut has at least two concentric adjusting screws that push the blades and partitions along the axial direction, so as to facilitate adjusting the concentricity of the blades and partitions, cutting the diagnostic test strips according to a constant size, protecting the blades, and extending the service life. Furthermore, in a state where the first axis is elastically supported, the position is adjusted along the length direction to finely adjust the cutting position. In addition, a boss is formed on the surface of the partition that is in contact with the blade that forms the knife edge, thereby preventing the cut diagnostic test strips from being damaged while protecting the blades. Background Art

[0002] Typically, a diagnostic test strip (test kit) is manufactured as a strip-shaped diagnostic test strip, which is cut and manufactured using a variety of cutting devices, such as the following (Patent Document 1) to (Patent Document 3).

[0003] (Patent Document 1) Korean Registered Patent No. 10-1617095

[0004] A test strip cutting device for a diagnostic test kit is disclosed. The device comprises: a cutter, which comprises an upper cutter body and a lower cutter body for cutting a diagnostic card; a cutter driving unit, which causes the upper cutter body to move back and forth vertically so as to continuously obtain a first diagnostic test strip and a second diagnostic test strip from the diagnostic card; a diagnostic card transfer unit, which causes the diagnostic card to move in stages to a cutting area between the upper cutter body and the lower cutter body; a first vacuum block and a second vacuum block, which respectively hold the first diagnostic test strip and the second diagnostic test strip; and a diagnostic test strip unloader, which moves the first vacuum block and the second vacuum block from the cutting area to the unloading area, and expands the distance between the first vacuum block and the second vacuum block.

[0005] (Patent Document 2) Korean Registered Patent No. 10-1859280

[0006] A test strip cutting device for a diagnostic test kit is disclosed. The device comprises: an upper cutting roller, which is equipped with a plurality of upper circular blades to cut a diagnostic card into a plurality of diagnostic test strips; a lower cutting roller, which is equipped with lower circular blades corresponding to the plurality of upper circular blades; a cleaning liquid conveying part, which is arranged on the upper part of the upper cutting roller and conveys cleaning liquid to facilitate the removal of impurities on the plurality of upper and lower circular blades; and a recovery container, which is arranged on the lower part of the lower cutting roller and is used to recover the cleaning liquid and the impurities removed from the plurality of upper and lower circular blades.

[0007] (Patent Document 3) Korean Registered Patent No. 10-2031214

[0008] The invention relates to a test strip cutting and inspection device for making an in vitro diagnostic kit, characterized in that a conveying part is formed, the conveying part senses whether the uncut test strip is located at a fixed position through a first camera; a circular rotary cutter is formed, the circular rotary cutter is used to cut the uncut test strip at the rear end of the conveying part to produce a plurality of test strips; a test strip transceiver is formed, the test strip transceiver separates the test strips at the rear end of the circular rotary cutter from each other and moves the test strips; a test strip good and bad product identification part is formed, the test strip good and bad product identification part is arranged on the side of the test strip transceiver, and is used to identify whether the film surface of the test strip is bad. Thus, the uncut test strip is cut without the operation of the operator, and a plurality of test strips are made at the same time, and whether the plurality of test strips are bad is quickly identified, and the process of making the test strips and identifying whether the test strips are bad is automatically completed. Based on the above technical features, the process of making a plurality of test strips and checking whether the test strips are bad is automatically completed by the simple step of allowing the uncut test strips to enter the conveying part. The second camera can be used to identify whether the test result is bad, thereby increasing the bad inspection rate and improving product performance. The uncut test paper is made into multiple test strips, and the test strips with bad membrane surface are easily and automatically identified by the test strip good and bad product identification unit, so that the uncut test strips do not need to be destroyed. Therefore, the production cost can be reduced and the production efficiency can be improved.

[0009] However, the above-mentioned traditional cutting method inserts the diagnostic test paper between two rollers and cuts it into multiple test strips. This method has the following disadvantages:

[0010] (1) When cutting multiple test strips at once along the width direction of a diagnostic test strip that is transported in a strip shape, it is usually necessary to have multiple blades on the roller. However, it is difficult to make multiple blades on the roller. In addition, if the blades are made integrally on the roller, if they are easily damaged during use or one of them is damaged, defective products will be produced and the entire roller will need to be replaced. Therefore, not only is the service life short, but the maintenance cost is also high.

[0011] (2) In order to solve the above drawbacks, a method can be adopted: the blade of the roller is made detachable, the blade and the partition are inserted into the roller in sequence, and locked and fixed by a nut. However, this method has the following drawbacks.

[0012] (3) When the spacer and the blade inserted into the shaft are assembled by locking the nut, even if the nut is finely made and locked on the shaft, it will press the blade and the spacer at an angle, which will cause the blade to deviate from the concentric position.

[0013] (4) This causes the blade to rotate like a scimitar, so when the diagnostic test paper is cut to make test strips, the test strips will appear unevenly spaced or twisted, which is very likely to produce defective products.

[0014] (5) At this time, there is occasionally a situation where the tightening of the adjustment nut is not enough and the tightening of the blade and the partition is not enough. At this time, various disadvantages may occur, such as the blade and the partition cannot maintain a constant distance, the blade cannot completely cut out the diagnostic test paper, or the cut test paper strip is sandwiched between the blade and the partition.

[0015] (6) In addition, when the adjusting nut is overtightened, the edges of the blades on both sides that rotate around the diagnostic test paper may bend in the direction opposite to the locking direction, so that the cutting position is misaligned and the diagnostic test paper cannot be cut. In addition, the relative blades are easily damaged due to contact. Summary of the invention

[0016] Technical issues

[0017] In order to solve the above-mentioned drawbacks, the purpose of the present invention is to provide a test strip cutting device for a diagnostic test kit, characterized in that an adjusting nut is lockably assembled on the shaft to fix multiple partitions and blades that are repeatedly inserted into the shaft, and at least two concentric adjusting screws are lockably assembled on the adjusting nut. When the partition and the blade are fixed by the adjusting nut, the partition and the blade are pushed in a direction parallel to the shaft through the concentric adjusting screws to align them concentrically, so that the diagnostic test strip can be cut with a given width while protecting the blade to allow it to be used for a longer time.

[0018] In particular, another object of the present invention is to provide a test strip cutting device for a diagnostic test kit, characterized in that while an axis located on one side based on the diagnostic test strip is elastically supported, its position is adjusted in the opposite direction along its length, thereby adjusting the distance between the blade on the other axis, eliminating defects, making cutting more accurate, and protecting the blade through a buffering effect.

[0019] Furthermore, another object of the present invention is to provide a test strip cutting device for a diagnostic test kit, characterized in that a boss is formed on the edge of the partition surface opposite to the surface forming the blade edge to provide excess space for shaking the blade, thereby preventing the cut test strip from being deformed and preventing the blade from being damaged.

[0020] Technical Solution

[0021] In order to achieve the above-mentioned purpose of the present invention, the present invention provides a test strip cutting device for a diagnostic kit, characterized in that the transported plate-shaped diagnostic test strip is cut along the width direction to cut into a plurality of strip-shaped test strips at one time. The test strip cutting device for a diagnostic kit comprises: a frame (100); a first shaft (200'), on which a plurality of disc-shaped blades (210') and partitions (210") are inserted and fixed to prevent alternating rotation, and one side is locked and fixed with an adjusting nut (230) to prevent the blades (210') and partitions (210") from falling off; and a second shaft (200"), on which a plurality of disc-shaped blades (210') and partitions (210") are inserted and fixed to prevent alternating rotation, and one side is locked and fixed with an adjusting nut (230). The first shaft (200') and the second shaft (200") are rotatably mounted on the frame (100) and simultaneously rotate in situ on the frame (100). Then, the blade (210') finely cuts the diagnostic test paper (10) into a plurality of test strips (11) through cutting force. The adjusting nut (230) is respectively locked and fixed on the first shaft (200') and the second shaft (200"), and at least two concentric adjusting screws (231) are locked on a virtual circle with the center of the first shaft (200') as the reference, so as to facilitate pushing the blade (210') and the partition (210") in the width direction to adjust the concentricity.

[0022] In particular, the partition (210") is assembled on the first shaft (200'), wherein the outer edge of the surface opposite to the surface forming the cutting edge of the blade (210') forms a boss (214) according to a preset interval W. At this time, the interval W is 0.05 mm to 2 mm.

[0023] Finally, in the first shaft (200'), a compression spring (240), a tapered bearing (250') and a bearing (250") are sequentially inserted on one side to support rotation and absorb the force applied along the axial direction; the other side includes: a bearing (260), which is assembled on the first shaft (200') to support rotation and support movement along the length direction; a length adjustment screw (271), which is assembled on the frame (100); and a thrust bearing (270), which is assembled on the first shaft (200') to enable the length adjustment screw (271) to rotate in place and support rotation.

[0024] Beneficial Effects

[0025] The test strip cutting device for a diagnostic kit according to the present invention has the following technical effects:

[0026] (1) The adjusting nut is used to fix a plurality of partitions and blades that are made into a single piece and repeatedly inserted into the shaft, and a concentric adjusting screw is arranged on the adjusting nut. Therefore, as the adjusting screw is locked and fixed to the shaft, even if the partitions and blades are not concentric, they can be easily and accurately aligned by the concentric adjusting screw to achieve concentricity.

[0027] (2) In particular, the concentric adjustment is implemented by means of a screw, and the rotation amount is converted into a linear direction to complete the concentric adjustment. The accuracy of the concentric adjustment can reach 0.01 mm, and high-precision concentric adjustment can be achieved.

[0028] (3) When the first axis is elastically supported along the length direction, it can be adjusted along the length direction. Therefore, the spacing between the blades relatively mounted on the first axis and the second axis can be adjusted, and the pre-cut test paper can be cut at a fixed position. The spacing effect can also be obtained by elastic shaking, so that the test strip can be cut more safely and conveniently.

[0029] (4) At this time, the first axis is adjusted along its length direction by locking it with screws, so the accuracy can reach 0.01 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] [ Figure 1 ] shows a side view of a test strip cutting device for a diagnostic kit in [Example 1] of the present invention, when a diagnostic test strip is placed on the test strip cutting device and cut into test strips;

[0031] [ Figure 2 ] shows a front view of the structure of a test strip cutting device for a diagnostic kit in [Example 1] of the present invention;

[0032] [ Figure 3 ] shows an exploded side view of the first axis structure in the structure of the test strip cutting device for a diagnostic kit according to [Example 1] of the present invention;

[0033] [ Figure 4 ] shows the structure of the blade in [Example 1] of the present invention, (a) is a front view, (b) is a side view;

[0034] [ Figure 5 ] shows the structure of the partition in [Example 1] of the present invention, (a) is a front view, (b) is a side view;

[0035] [ Figure 6 ] shows the adjusting nut in [Example 1] of the present invention, (a) is a front view, (b) shows the working state when the concentric adjustment is implemented by the adjusting nut;

[0036] [ Figure 7 ] shows the boss formed on the partition in [Example 2] of the present invention, which is a partial enlarged view of the partition and the blade;

[0037] [ Figure 8 ] shows a front view of the structure of the first axis in [Example 3] of the present invention.

[0038] Explanation of symbols

[0039] 10: diagnostic test paper; 11: test strip; 100: frame;

[0040] 200': first axis; 200": second axis; 210': blade;

[0041] 210": spacer; 214: boss; 230: adjusting nut;

[0042] 231: concentric adjustment screw; 240: compression spring; 270: thrust bearing;

[0043] 271: Length adjustment screw; 280: Keyway. DETAILED DESCRIPTION

[0044] The preferred embodiments of the present invention are described in further detail below with reference to the accompanying drawings. First, when interpreting the terms or words in this specification and claims, they should not be limited to the meanings recorded in common or dictionaries, but should be interpreted as meanings and concepts that conform to the technical ideas of the present invention based on the principle that the inventor can appropriately define the terminology and concepts and describe his invention in the most optimal way.

[0045] Therefore, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all the technical ideas of the present invention. It should be understood from the perspective of this application that there are many equivalents and modifications that can replace them.

[0046] [Mode for Carrying Out the Invention]

[0047] [Example 1]

[0048] like[ Figure 1 ]to[ Figure 6 ] As shown in [Example 1] of the present invention, the test strip cutting device for a diagnostic test kit can cut a plate-shaped diagnostic test strip 10 with a long conveying length along the width direction, and cut it into multiple strip-shaped test strips 11 at one time, which includes a frame 100, a first axis 200' and a second axis 200".

[0049] In particular, in the first shaft 200', a plurality of blades 210' and an adjusting nut 230 for fixing the partition 210" are alternately inserted into the first shaft 200', and at least two concentric adjusting screws 231 are locked, so that when the adjusting nut 230 cannot apply equal pressure to the blade 210' and the partition 210", the concentric adjusting screws 231 are used to apply pressure to the blade 210' and the partition 210" to align them and achieve concentricity.

[0050] The above structure is further described in detail below with reference to the accompanying drawings, wherein the reference numeral "10" indicates a diagnostic test paper in a strip shape with a diagnostic reagent on one side, and the reference numeral "11" indicates a plurality of strip-shaped test paper strips formed by cutting the diagnostic test paper at one time.

[0051] A. Framework

[0052] like[ Figure 1 ]and[ Figure 2 ] As shown in FIG. 1 , the frame (100) supports the two ends of the first axis 200' and the second axis 200", between which the diagnostic test paper 10 is inserted and cut into a plurality of test strips 11. In this way, the frame 100 can be made into any form as long as it is capable of supporting the two ends of the first axis 200' and the second axis 200", and the attached figure shows an example of making it into a grid form.

[0053] B. First and second axes

[0054] like[ Figure 1 ]to[ Figure 3 ], both ends of the first shaft 200' and the second shaft 200" can rotate in situ on the frame 100, and the periphery can cut a diagnostic test paper 10 into multiple test strips 11 at one time.

[0055] The first shaft 200' and the second shaft 200" are identical in structure, and therefore, the first shaft 200' is used as the reference for description, and the specific description of the second shaft is omitted. Furthermore, the first shaft 200' and the second shaft 200" can rotate in situ respectively, but preferably, the first shaft 200' and the second shaft 200" are respectively equipped with gears 220 so as to rotate simultaneously.

[0056] For this reason, Figure 1 ]to[ Figure 6 ] As shown in FIG. 1 , the two ends of the first shaft 200' are provided with bearings 250", 260 so as to provide support for rotation in situ. In addition, a plurality of blades 210' and partitions 210" are alternately inserted on the periphery. The locking adjustment nut 230 is fixed. At this time, a keyway 280 is formed on the first shaft 200', and blades 210' and partitions 210" are inserted therein and fixed to prevent rotation in situ.

[0057] 1. Blade

[0058] like[ Figure 2 ]to[ Figure 4 ], the blade 210' is disc-shaped. Figure 4 ] As shown in FIG. 1 , the edge of one side of the blade 210' forms a cutting edge 211, and the blade 210' is respectively assembled on the first axis 200' and the second axis 200", and cuts the diagnostic test paper 10 by using cutting force like scissors.

[0059] like[ Figure 4 ] As shown in FIG. 1 , a mounting hole 212 is formed through the center of the blade 210' to facilitate the insertion of the first shaft 200', and another keyway 213 is formed on one side of the mounting hole 212 to facilitate the insertion of the key inserted in the keyway 280.

[0060] 2. Partition

[0061] like[ Figure 2 ]and[ Figure 3 ], the partition 210" is in relative contact with the blade 210' and is assembled on the first shaft 200'. At this time, the partition 210" is made into a disc shape, and its diameter is slightly smaller than that of the blade 210', so that the blade 210' has space for cutting the diagnostic test paper 10. In addition, the partition 210" is the same as the blade 210', and also needs to be non-rotatably assembled on the first shaft 200', thereby forming a mounting hole 212 and a keyway 213. Such structures are the same as the relevant description of the blade 210', and their detailed description is omitted here.

[0062] 3. Adjusting nut

[0063] like[ Figure 2 ]、[ Figure 3 ]and[ Figure 6 ] As shown in the figure, the adjusting nut 230 is locked to one side of the first shaft 200'. Preferably, when the blade 210' and the partition 210" are inserted, the adjusting nut 230 is locked to the first shaft 200' and supported and fixed so as to arrange the blades 210' and the partition 210" side by side.

[0064] In particular, the adjusting nut 230 has at least two concentric adjusting screws 231 to facilitate the pressure application of the blade 210' and the partition 210". As the adjusting nut 230 is locked to the first shaft 200', as shown in [ Figure 6(b)] As shown in FIG. 1 , due to the characteristics of the screw, a gap angle θ may be formed. Therefore, even if the concentric adjustment screw 231 is tightened firmly, the blade 210' and the partition 210" may be out of concentricity. In this way, when the concentricity is inconsistent, a gap will be formed, which will cause the blade 210' and the partition 210" to shake, resulting in an inability to evenly cut the diagnostic test paper 10, or the cut test paper strip 11 being sandwiched therebetween. In view of this, even if the adjusting nut 230 of the present invention does not tightly abut the blade 210' and the partition 210", it will tightly abut therebetween through the concentric adjustment screw 231 while maintaining concentricity, thereby cutting the diagnostic test paper 10 according to preset specifications to form the test paper strip 11, thereby preventing the cut test paper strip 11 from being sandwiched therebetween.

[0065] In a preferred embodiment of the present invention, there are at least two concentric adjustment screws 231, preferably, two adjacent ones are equally spaced, and most preferably, eight concentric adjustment screws 231 are equally spaced. The reason is that when the adjustment nut 230 is screwed for adjustment, a clearance angle θ may be formed on one side, and therefore, the spacing between the concentric adjustment screws 231 needs to be reduced, and the concentricity is adjusted by the concentric adjustment screws 231 that are always close.

[0066] Thus, anyone skilled in the art can easily understand that after the concentric adjustment is achieved by the concentric adjustment screw 231 , the concentricity of the blade 210 ′ can be verified using a concentricity gauge and adjusted.

[0067] The symbol "290" not shown indicates a partition inserted into the first and second shafts 200', 200" and used to adjust the spacing, which is inserted and used as needed, for example, the assembly quantity or position of the blade 210' and the partition 210" needs to be adjusted according to the length of the diagnostic test strip 10.

[0068] [Example 2]

[0069] like[ Figure 7 ], in [Example 2] of the present invention, the test strip cutting device for a diagnostic kit is the same in structure as that of the above-mentioned [Example 1], except that a boss 214 is additionally configured on the partition 210" assembled on the first shaft 200'. Therefore, the description here focuses on the additionally configured structure, and the specific description of the remaining structures that are the same as those of the above-mentioned [Example 1] are omitted.

[0070] like[ Figure 5 ]and[ Figure 7], [Example 2] forms a boss 214 with a given spacing W on one side of the disc. At this time, preferably, the boss 241 is formed on the surface of the partition 210", and the surface of the partition 210" is connected to the surface forming the cutting edge 211 of the blade 210'. Therefore, when the shaft is over-pressurized by the adjusting nut 230, the portion close to the shaft will deform along the direction of the pressure, while the edge portion forming the cutting edge 211 will bend in the opposite direction of the pressure. In response to this deformation, the boss 214 is formed as a deformable space to prevent the test strip 11 cut by the blade 210' from deforming while minimizing damage to the blade 210'.

[0071] In a preferred embodiment of the present invention, as [ Figure 7 ] As shown in FIG. 1 , preferably, the spacing W of the bosses 214 is 0.05 mm to 2 mm, and most preferably, it is 0.1 mm.

[0072] [Example 3]

[0073] like[ Figure 8 ], in [Example 3] of the present invention, the test strip cutting device for the diagnostic kit is the same in structure as [Example 1] and [Example 2] above, except that a structure is additionally configured on the first axis 200' so that it can move along its length direction. Therefore, the description here is centered on the structure of the additional configuration, and the specific description of the other structures such as [Example 1] and [Claim 2] above is omitted.

[0074] like[ Figure 8 ] As shown in [Example 3], the first shaft 200' is adjusted to move along the length direction, and the distance between the blades 210' respectively assembled on the first shaft 200' and the second shaft 200" is adjusted to ensure that the diagnostic test paper 10 is cut better.

[0075] For this reason, Figure 8 ] As shown in FIG. 1 , at least one side of the first shaft 200' is additionally provided with a tapered bearing 250', so that even if the first shaft 200' moves along the length direction, it can be stably supported. At this time, preferably, the tapered bearing 250' and the above-mentioned bearing 250' are not squeezed to the rear and are assembled in the frame 100 with stable support. In particular, a compression spring 240 is inserted between the first shaft 200' and the tapered bearing 250', so that when the first shaft 200' is pressed along the length direction, a rebound force is provided in the opposite direction thereof to play a buffering role.

[0076] And, as [ Figure 8] As shown in FIG. 1 , a thrust bearing 270 is mounted on the other side of the first shaft 200' to support the first shaft 200', and the thrust bearing 270 is connected to a length adjustment screw 271 mounted on the frame 100. At this time, if the length needs to be adjusted by the length adjustment screw 271, that is, if the spacing between the blades 210' respectively mounted on the first shaft 200' and the second shaft (200") needs to be adjusted, the length adjustment screw 271 is screwed to move the first shaft 200' along the length direction and push the thrust bearing 270 to complete the adjustment. At this time, the first shaft 200' obtains the elastic support of the compression spring 240, and always obtains the buffering effect to complete the length adjustment, thereby adjusting the spacing between the blades 210'. At the same time, even if the blades are misaligned with each other, the buffering effect can be used to guide them to reset to the preset position.

[0077] As described above, the present invention enables the first axis to obtain elastic support, thereby achieving adjustment along the length direction, so that when the blade position needs to be adjusted, it can be easily adjusted to stably cut the diagnostic test paper. In addition, since the elastic support achieves a buffering effect, it can not only protect the blade, but also cut at a preset position and in a preset shape.

Claims

1. A test strip cutting device for a diagnostic kit, which cuts a transported plate-shaped diagnostic test strip along the width direction to cut a plurality of strip-shaped test strips at one time, wherein the test strip cutting device for a diagnostic kit is characterized in that: include: frame(100); A first shaft (200') is inserted with a plurality of disc-shaped blades (210') and partitions (210") and fixed to prevent alternating rotation, and one side is locked and fixed with an adjustment nut (230) to prevent the blades (210') and partitions (210") from falling off; and The second shaft (200") is inserted with a plurality of disc-shaped blades (210') and partitions (210") and fixed to prevent alternating rotation, and one side is locked and fixed with an adjusting nut (230) to prevent the blades (210') and partitions (210") from falling off. The first shaft (200') and the second shaft (200") are rotatably mounted on the frame (100) and simultaneously rotate in situ on the frame (100), whereupon the blades (210') finely cut the diagnostic test paper (10) into a plurality of test paper strips (11) through cutting force. The adjusting nuts (230) are respectively locked and fixed on the first shaft (200') and the second shaft (200"), and at least two concentric adjusting screws (231) are locked on a virtual circle with the center of the first shaft (200') as the reference, so as to facilitate pushing the blade (210') and the partition (210") along the width direction to adjust the concentricity. The partition plate (210") is assembled on the first shaft (200'), wherein a boss (214) is formed at a preset interval W from the outer edge of the surface opposite to the surface forming the cutting edge of the blade (210') toward the thickness direction of the partition plate (210").

2. The test strip cutting device for a diagnostic kit according to claim 1, characterized in that: The spacing W is 0.05 mm to 2 mm.

3. The test strip cutting device for a diagnostic kit according to claim 1 or 2, characterized in that: A compression spring (240), a tapered bearing (250') and a first bearing (250") are sequentially inserted into one side of the first shaft (200') to support rotation and absorb force applied along the axial direction; The other side includes: a second bearing (260) mounted on the first shaft (200') to support rotation and movement along the length direction; a length adjustment screw (271) mounted on the frame (100); and a thrust bearing (270) mounted on the first shaft (200') to enable the length adjustment screw (271) to rotate in situ and support rotation.

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