Detection clamp for MT-FA test

Abstract

The utility model discloses a detection clamp for an MT-FA test, the MT-FA comprises at least one optical fiber group and at least one connector, and the detection clamp comprises a base, a first fixing piece and a second fixing piece. The first fixing piece is arranged on the base, the end wall, away from the base, of the first fixing piece is provided with at least one first fixing groove, the first fixing groove is opened in the direction away from the base, the optical fiber set is placed in the first fixing groove, the side wall of the first fixing groove is provided with a limiting protrusion, and the limiting protrusion is in limiting fit with the optical fiber set; the second fixing piece is arranged on the base, at least one second fixing groove is formed in the end wall, away from the base, of the second fixing piece, the second fixing groove is opened in the direction away from the base, and the connector is inserted into the second fixing groove and matched with the second fixing groove in a limiting mode. According to the invention, the optical fiber group does not need to be limited in a perforation mode, the problem that the detection hole and the optical fiber group are difficult to align due to fatigue of workers is avoided, and the installation efficiency of FA can be improved.

Description

Technical Field

[0001] This application relates to the field of MT-FA test fixtures, and more particularly to a test fixture for MT-FA testing. Background Technology

[0002] In related technologies, the polarity of MT-FA needs to be tested during use. Before testing the polarity of MT-FA, MT-FA needs to be installed in a special test fixture to fix MT-FA. After MT-FA is installed in the test fixture, the test fixture is placed in the testing equipment to test the polarity of MT-FA.

[0003] Traditional test fixtures have through holes drilled inside the fixture. Operators insert the FA into the through holes to limit its movement. After working for a long time, operators become fatigued and need to align the FA with the through holes multiple times to insert it, which reduces the installation efficiency of the FA and the testing efficiency of the MT-FA. Utility Model Content

[0004] To improve the installation efficiency of FA under operator fatigue and to improve the detection efficiency of MT-FA, this application provides a testing fixture for MT-FA testing.

[0005] The testing fixture for MT-FA testing provided in this application adopts the following technical solution:

[0006] A testing fixture for MT-FA testing, the MT-FA including at least one fiber optic assembly and at least one connector, comprising: a base; a first fixing member disposed on the base, the first fixing member having at least one first fixing groove on its end wall away from the base, the first fixing groove being open in a direction away from the base, the fiber optic assembly being placed in the first fixing groove, the side wall of the first fixing groove having a limiting protrusion, the limiting protrusion engaging with the fiber optic assembly; and a second fixing member disposed on the base, the second fixing member having at least one second fixing groove on its end wall away from the base, the second fixing groove being open in a direction away from the base, the connector being inserted into the second fixing groove and engaging with the second fixing groove.

[0007] By adopting the above technical solution, the fiber optic assembly is inserted into the first fixing slot through its upward-facing open opening, and the limiting protrusion engages with the fiber optic assembly to effectively limit its movement. Compared with existing technologies, this eliminates the need for perforation to limit the fiber optic assembly, avoiding the problem of alignment difficulties between the detection hole and the fiber optic assembly due to worker fatigue. This improves the installation efficiency of the FA and the detection efficiency of the MT-FA.

[0008] Preferably, there are multiple first fixing slots and / or multiple second fixing slots, and the multiple first fixing slots and / or multiple second fixing slots are spaced apart along the first direction of the base.

[0009] By adopting the above technical solution, operators can simultaneously place multiple fiber optic groups and multiple connectors on the testing fixture. Multiple first fixing slots form limiting engagements with corresponding fiber optic groups through corresponding limiting protrusions, and multiple second fixing slots form limiting engagements with corresponding connectors. This allows multiple fiber optic groups and multiple connectors to be stably positioned on the testing fixture, thereby improving the batch installation efficiency of fiber optic groups and connectors, and thus improving the overall testing efficiency of MT-FA.

[0010] Preferably, the first fixing member is slidably connected to the base, the end wall of the first fixing member near the base is provided with a guide protrusion, the base is provided with a sliding groove, and the guide protrusion extends into the sliding groove and is guided and engaged with the sliding groove.

[0011] By adopting the above technical solution, when installing fiber optic assemblies of different lengths, the operator can slide and adjust the position of the first fixing member according to the length of the fiber optic assembly, so that fiber optic assemblies of different lengths can be installed between the first fixing member and the second fixing member. This allows the testing fixture to be adapted to fiber optic assemblies of different lengths, thereby improving the compatibility and flexibility of the testing fixture.

[0012] Preferably, the base has an oblong hole on the end wall away from the first fixing member, and the first fixing member has a connecting hole on the end wall near the base. The connecting hole is arranged opposite to the oblong hole, and the fastener passes through the oblong hole and the connecting hole in sequence to fix the base and the first fixing member.

[0013] By adopting the above technical solution, the operator first drives the first fixing part to a preset position that matches the length of the optical fiber group, and then makes the fastener pass through the waist-shaped hole and the connecting hole in sequence, and tightens the fastener to fix the connecting base and the first fixing part. This can prevent the first fixing part from being displaced due to external force during the detection process, thereby ensuring that the optical fiber group is always in a stable limited state and improving the working reliability of the detection fixture.

[0014] Preferably, there are multiple waist-shaped holes, multiple connecting holes and multiple fasteners, and the multiple waist-shaped holes, multiple connecting holes and multiple fasteners are all spaced apart along the first direction of the base, and the multiple waist-shaped holes, multiple connecting holes and multiple fasteners are all arranged in a one-to-one correspondence.

[0015] By adopting the above technical solution, by sequentially passing multiple fasteners through the corresponding oblong holes and corresponding connecting holes and tightening the fasteners one by one, the first fixing member can be firmly fixed in the preset position, thereby preventing the first fixing member from loosening or tilting, and thus improving the reliability of the testing fixture.

[0016] Preferably, the optical fiber group includes a first optical fiber group and a second optical fiber group. The width of the first optical fiber group is different from that of the second optical fiber group. The first fixing member has at least one third fixing groove on the end wall away from the base. The width of the first fixing groove and the width of the third fixing groove are different along the first direction of the base. One of the first optical fiber group and the second optical fiber group is placed in the first fixing groove, and the other is disposed in the third fixing groove and is limited and matched with the third fixing groove.

[0017] By adopting the above technical solution, the operator places the first fiber optic group in the first fixing slot and inserts the second fiber optic group into the third fixing slot according to the width of the fiber optic group. This ensures that the first and second fiber optic groups are stably fixed in their respective fixing slots, thus preventing loosening and shaking during the testing of the first and second fiber optic groups.

[0018] Preferably, the testing fixture further includes: a third fixing member, which is slidably disposed on the base, and a fourth fixing groove is provided on the end wall of the third fixing member away from the base. The fourth fixing groove is open in the direction away from the base and is disposed opposite to the second fixing groove. The adapter of the MT-FA testing device is inserted into the fourth fixing groove and is adapted to drive the third fixing member to move closer to the second fixing member so that the adapter can be connected and engaged with the connector.

[0019] By adopting the above technical solution, the adapter is inserted into the fourth fixing slot. The operator drives the third fixing member to move closer to the second fixing member so that the adapter and the connector can be connected and cooperated. When there are multiple connectors and adapters, the operator does not need to connect the connectors and adapters one by one, thereby improving the connection efficiency of the adapter and connector.

[0020] Preferably, the base is provided with a guide rod, the third fixing member is provided with a guide hole, and the guide rod passes through the guide hole and is guided and engaged with the guide hole.

[0021] By adopting the above technical solution, the guide rod and guide hole can guide and cooperate to prevent the third fixing part from deviating from the preset motion trajectory, and can prevent the adapter and connector from failing to connect and cooperate, thereby improving the reliability of the testing fixture.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. By inserting the fiber optic assembly into the first fixing slot through its upward-facing opening, and by using a limiting protrusion to limit the fiber optic assembly, effective positioning of the fiber optic assembly is achieved. Compared with existing technologies, this eliminates the need for perforation to limit the fiber optic assembly, avoiding the problem of difficulty in aligning the detection hole and the fiber optic assembly due to worker fatigue. This improves the installation efficiency of the FA and the detection efficiency of the MT-FA.

[0024] 2. By sequentially passing multiple fasteners through the corresponding oblong holes and corresponding connecting holes and tightening the fasteners one by one, the first fastener can be firmly fixed in the preset position, thereby preventing the first fastener from loosening or tilting, and thus improving the reliability of the inspection fixture.

[0025] 3. The adapter is inserted into the fourth fixing slot. The operator drives the third fixing part to move closer to the second fixing part so that the adapter and the connector can be connected and engaged. When there are multiple connectors and adapters, this setting eliminates the need for the operator to connect the connectors and adapters one by one, thereby improving the connection efficiency of the adapters and connectors. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the detection fixture according to the embodiments of this application;

[0027] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0028] Figure 3 This is a schematic diagram of the detection fixture from another angle according to an embodiment of this application;

[0029] Figure 4 This is a cross-sectional view of the detection fixture according to the embodiments of this application;

[0030] Figure 5 This is a schematic diagram of the detection fixture from another angle according to an embodiment of this application;

[0031] Figure 6 This is a cross-sectional view of the detection fixture according to an embodiment of this application from another angle.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100. Testing fixtures;

[0034] 1. Base; 11. Sliding groove; 12. Oval hole; 13. Guide rod;

[0035] 2. First fixing component; 21. First fixing groove; 211. Limiting protrusion; 22. Guide protrusion; 23. Connecting hole; 24. Third fixing groove;

[0036] 3. Second fastener; 31. Second fixing groove;

[0037] 4. Fasteners;

[0038] 5. Third fastener; 51. Fourth fastening groove; 52. Guide hole. Detailed Implementation

[0039] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0040] This application discloses a testing fixture 100 for MT-FA testing.

[0041] Reference Figure 1 and Figure 2 According to an embodiment of this application, a test fixture 100 for MT-FA testing is provided. The MT-FA includes at least one fiber optic group and at least one connector. The test fixture 100 for MT-FA testing includes: a base 1, a first fixing member 2, and a second fixing member 3.

[0042] It should be noted that the fiber optic array is FA (Fiber Array) and the connector is MT (MT Ferrule).

[0043] The first fixing member 2 and the second fixing member 3 are both provided on the base 1. The end wall of the first fixing member 2 away from the base 1 is provided with at least one first fixing groove 21, which is open in the direction away from the base 1. The end wall of the second fixing member 3 away from the base 1 is provided with at least one second fixing groove 31, which is open in the direction away from the base 1.

[0044] Specifically, along the height direction of the base 1, the first fixing member 2 and the second fixing member 3 are both located on the upper end wall of the base 1. The first fixing groove 21 and the second fixing groove 31 both open downwards, and both are constructed as through grooves. The height direction of the base 1 can be indicated by… Figure 4 The up and down directions in the middle.

[0045] In some specific embodiments, the first fixing groove 21 and the second fixing groove 31 can be arranged relative to each other.

[0046] Furthermore, the optical fiber assembly is placed in the first fixing groove 21. The side wall of the first fixing groove 21 is provided with a limiting protrusion 211. Along the height direction of the base 1, the limiting protrusion 211 is spaced apart from the bottom wall of the first fixing groove 21. The limiting protrusion 211 is located above the bottom wall of the first fixing groove 21. The limiting protrusion 211 is in a limiting engagement with the optical fiber assembly. The connector is inserted into the second fixing groove 31 and is in a limiting engagement with the second fixing groove 31.

[0047] Specifically, the operator places the optical fiber assembly into the first fixed slot 21 through the upward-opening opening of the first fixed slot 21. Then, the limiting protrusion 211 engages with the wire portion of the optical fiber assembly to prevent the optical fiber assembly from detaching from the first fixed slot 21 and to achieve the technical effect of confining the optical fiber assembly within the first fixed slot 21. Then, the operator inserts the connector into the second fixed slot 31, thereby confining the connector within the testing fixture 100.

[0048] Furthermore, when the operator is fatigued, the operator inserts the fiber optic bundle into the detection hole one after another. This setting can easily lead to damage to the ends of the fiber optic bundle. By placing the fiber optic bundle directly in the first fixing groove 21 and using the limiting protrusion 211 to limit and cooperate with the fiber optic bundle, damage to the ends of the fiber optic bundle can be avoided as much as possible, thereby improving the product quality of MT-FA.

[0049] Therefore, by inserting the fiber optic assembly into the first fixing slot 21 through its upward-facing opening, and with the limiting protrusion 211 engaging with the fiber optic assembly, effective positioning of the fiber optic assembly is achieved. Compared to existing technologies, this eliminates the need for perforation to position the fiber optic assembly, avoiding the problem of alignment difficulties between the detection hole and the fiber optic assembly due to worker fatigue. This improves the installation efficiency of the FA and enhances the testing efficiency of the MT-FA.

[0050] Reference Figure 1 In some embodiments of this application, there are multiple first fixing slots 21 and / or multiple second fixing slots 31, and the multiple first fixing slots 21 and / or multiple second fixing slots 31 are spaced apart along the first direction of the base 1. The first direction of the base 1 can refer to... Figure 1 The left and right directions in the middle.

[0051] In some specific embodiments, there are multiple first fixing slots 21 and multiple second fixing slots 31, and there are multiple fiber optic groups and multiple connectors.

[0052] In other specific embodiments, there are multiple first fixing slots 21, a single second fixing slot 31, multiple fiber optic groups, and a single connector.

[0053] In some other specific embodiments, the first fixing slot 21 is a single one, the second fixing slot 31 is multiple, the fiber optic group is a single one, and the connector is multiple.

[0054] Specifically, the operator can simultaneously place multiple fiber optic groups and multiple connectors on the testing fixture 100. Multiple first fixing slots 21 form limiting engagements with corresponding fiber optic groups through corresponding limiting protrusions 211, and multiple second fixing slots 31 form limiting engagements with corresponding connectors. This allows multiple fiber optic groups and multiple connectors to be stably positioned on the testing fixture 100, thereby improving the batch installation efficiency of fiber optic groups and connectors, and thus improving the overall testing efficiency of MT-FA.

[0055] Reference Figures 1-3 In some embodiments of this application, the first fixing member 2 is slidably connected to the base 1. The first fixing member 2 is provided with a guide protrusion 22 near the end wall of the base 1. The base 1 is provided with a sliding groove 11. Along the height direction of the base 1, the guide protrusion 22 is provided on the bottom wall of the first fixing member 2, and the sliding groove 11 is provided on the top wall of the base 1. The guide protrusion 22 extends into the sliding groove 11 and is guided and engaged with the sliding groove 11.

[0056] Specifically, when installing fiber optic assemblies of different lengths, the operator can slide and adjust the position of the first fixing member 2 according to the length of the fiber optic assembly, so that fiber optic assemblies of different lengths can be installed between the first fixing member 2 and the second fixing member 3. This allows the testing fixture 100 to be adapted to fiber optic assemblies of different lengths, thereby improving the compatibility and flexibility of the testing fixture 100.

[0057] Furthermore, by guiding the first fixing member 22 in conjunction with the guide groove, the first fixing member 2 can be prevented from deviating from the preset motion trajectory, and the first fixing member 2 can be prevented from tilting, which would cause some of the optical fibers in the optical fiber group to bend, thereby improving the reliability of the detection fixture 100.

[0058] Reference Figure 4 In some embodiments of this application, the end wall of the base 1 away from the first fixing member 2 is provided with a waist-shaped hole 12, and the waist-shaped hole 12 is constructed as a countersunk through hole. The end wall of the first fixing member 2 near the base 1 is provided with a connecting hole 23, and the connecting hole 23 is arranged opposite to the waist-shaped hole 12. The fastener 4 passes through the waist-shaped hole 12 and the connecting hole 23 in sequence to fix and connect the base 1 and the first fixing member 2.

[0059] In some specific embodiments, the fastener 4 can be a screw or bolt, etc.

[0060] In some specific embodiments, the connection hole 23 can be configured as a through hole.

[0061] In some other specific embodiments, the connection hole 23 may be configured as a blind hole.

[0062] The operator first drives the first fixing part 2 to a preset position that matches the length of the optical fiber group. Then, the fastener 4 passes through the waist-shaped hole 12 and the connecting hole 23 in sequence, and tightens the fastener 4 to fix the connecting base 1 and the first fixing part 2. This can prevent the first fixing part 2 from being displaced due to external force during the detection process, thereby ensuring that the optical fiber group is always in a stable limited state and improving the working reliability of the detection fixture 100.

[0063] Reference Figure 4 and Figure 5 In some embodiments of this application, there are multiple waist-shaped holes 12, multiple connecting holes 23 and multiple fasteners 4. The multiple waist-shaped holes 12, multiple connecting holes 23 and multiple fasteners 4 are all spaced apart along the first direction of the base 1, and the multiple waist-shaped holes 12, multiple connecting holes 23 and multiple fasteners 4 are all arranged in a one-to-one correspondence.

[0064] Specifically, by sequentially passing multiple fasteners 4 through the corresponding oblong holes 12 and the corresponding connecting holes 23 and tightening the fasteners 4 one by one, the operator can firmly fix the first fixing member 2 in the preset position, thereby preventing the first fixing member 2 from loosening and tilting, and thus improving the reliability of the testing fixture 100.

[0065] Furthermore, with the configuration of multiple waist-shaped holes 12 and connecting holes 23, operators can choose the appropriate position for fixing according to different needs, avoiding the loosening or displacement of the first fastener 2 due to a single fastening point, thus improving the detection accuracy of MT-FA.

[0066] Reference Figure 1 and Figure 3 In some embodiments of this application, the optical fiber group includes a first optical fiber group and a second optical fiber group. The width dimensions of the first optical fiber group and the second optical fiber group are different. The width direction of the optical fiber group is the first direction of the base 1.

[0067] The first fixing member 2 has at least one third fixing groove 24 on its end wall away from the base 1. The width of the first fixing groove 21 and the width of the third fixing groove 24 are different along the first direction of the base 1. One of the first optical fiber group and the second optical fiber group is placed in the first fixing groove 21, and the other of the first optical fiber group and the second optical fiber group is located in the third fixing groove 24 and is limited to the third fixing groove 24.

[0068] It should be noted that the light emission angle of the optical fiber group located in the third fixed slot 24 is parallel to the central axis of the optical fiber group. The optical fiber group located in the third fixed slot 24 is placed horizontally in the third fixed slot 24. Under the action of gravity, the optical fiber group located in the third fixed slot 24 is confined within the third fixed slot 24.

[0069] In some specific embodiments, the first optical fiber group is placed in the first fixing slot 21, and the second optical fiber group is inserted into the third fixing slot 24.

[0070] According to the width of the fiber optic group, the operator places the first fiber optic group in the first fixing slot 21 and inserts the second fiber optic group into the third fixing slot 24, so that the first fiber optic group and the second fiber optic group are stably fixed in their respective fixing slots, which can prevent loosening and shaking during the testing of the first fiber optic group and the second fiber optic group.

[0071] Furthermore, by setting a first fixing slot 21 and a third fixing slot 24 with different width dimensions, the detection fixture 100 can adapt to fiber optic groups with different width dimensions, thereby improving the adaptability of the detection fixture 100.

[0072] Reference Figure 1 and Figure 4 In some embodiments of this application, the testing fixture 100 may further include: a third fixing member 5, which is slidably disposed on the base 1. The end wall of the third fixing member 5 away from the base 1 is provided with a fourth fixing groove 51. The fourth fixing groove 51 is open in the direction away from the base 1. Specifically, along the height direction of the base 1, the fourth fixing groove 51 is located on the upper end wall of the third fixing member 5. The fourth fixing groove 51 is open upward and is constructed as a through groove. The fourth fixing groove 51 is disposed opposite to the second fixing groove 31. The adapter of the MT-FA testing device is inserted into the fourth fixing groove 51 and is adapted to drive the third fixing member 5 to move closer to the second fixing member 3 so that the adapter can be connected and engaged with the connector.

[0073] The MT-FA testing equipment can only perform tests on MT-FA after the adapter and connector of the MT-FA testing equipment are connected and mated.

[0074] The adapter is inserted into the fourth fixing slot 51. The operator drives the third fixing member 5 to move closer to the second fixing member 3 so that the adapter and the connector can be connected and engaged. When there are multiple connectors and adapters, this setting eliminates the need for the operator to connect the connectors and adapters one by one, thereby improving the connection efficiency of the adapters and connectors.

[0075] Reference Figure 1 , Figure 4 and Figure 6In some embodiments of this application, the base 1 is provided with a guide rod 13, the third fixing member 5 is provided with a guide hole 52, and the guide hole 52 is constructed as a through hole, the guide rod 13 passes through the guide hole 52 and is guided and engaged with the guide hole 52.

[0076] Specifically, the guide rod 13 and guide hole 52 guide the engagement, thereby preventing the third fixing member 5 from deviating from the preset motion trajectory, preventing the adapter and connector from failing to connect and engage, and thus improving the reliability of the detection fixture 100.

[0077] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A testing fixture for MT-FA testing, the MT-FA comprising at least one fiber optic group and at least one connector, characterized in that, include: Base (1); A first fixing member (2) is provided on the base (1). The end wall of the first fixing member (2) away from the base (1) is provided with at least one first fixing groove (21). The first fixing groove (21) is open in the direction away from the base (1). The optical fiber group is placed in the first fixing groove (21). The side wall of the first fixing groove (21) is provided with a limiting protrusion (211). The limiting protrusion (211) is in a limiting cooperation with the optical fiber group. The second fixing member (3) is provided on the base (1). The end wall of the second fixing member (3) away from the base (1) is provided with at least one second fixing groove (31). The second fixing groove (31) is open in the direction away from the base (1). The connector is inserted into the second fixing groove (31) and is limited to the second fixing groove (31).

2. The testing fixture for MT-FA testing according to claim 1, characterized in that, There are multiple first fixing slots (21) and / or second fixing slots (31), and the multiple first fixing slots (21) and / or multiple second fixing slots (31) are spaced apart along the first direction of the base (1).

3. The testing fixture for MT-FA testing according to claim 1, characterized in that, The first fixing member (2) is slidably connected to the base (1). The first fixing member (2) has a guide protrusion (22) on the end wall near the base (1). The base (1) has a sliding groove (11). The guide protrusion (22) extends into the sliding groove (11) and is guided and engaged with the sliding groove (11).

4. A testing fixture for MT-FA testing according to claim 3, characterized in that, The base (1) has a waist-shaped hole (12) on the end wall away from the first fixing member (2), and the first fixing member (2) has a connecting hole (23) on the end wall near the base (1). The connecting hole (23) is arranged opposite to the waist-shaped hole (12). The fastener (4) passes through the waist-shaped hole (12) and the connecting hole (23) in sequence to fix the base (1) and the first fixing member (2).

5. A testing fixture for MT-FA testing according to claim 4, characterized in that, There are multiple waist-shaped holes (12), multiple connecting holes (23) and multiple fasteners (4). The multiple waist-shaped holes (12), multiple connecting holes (23) and multiple fasteners (4) are all spaced apart along the first direction of the base (1), and the multiple waist-shaped holes (12), multiple connecting holes (23) and multiple fasteners (4) are all arranged in a one-to-one correspondence.

6. A testing fixture for MT-FA testing according to claim 1, wherein the fiber optic group comprises a first fiber optic group and a second fiber optic group, the width dimensions of the first fiber optic group and the second fiber optic group being different, characterized in that... The first fixing member (2) has at least one third fixing groove (24) on the end wall away from the base (1). Along the first direction of the base (1), the width of the first fixing groove (21) and the width of the third fixing groove (24) are different. One of the first optical fiber group and the second optical fiber group is placed in the first fixing groove (21), and the other is located in the third fixing groove (24) and is limited to the third fixing groove (24).

7. A testing fixture for MT-FA testing according to claim 1, characterized in that, Also includes: The third fixing member (5) is slidably disposed on the base (1). The end wall of the third fixing member (5) away from the base (1) is provided with a fourth fixing groove (51). The fourth fixing groove (51) is open in the direction away from the base (1). The fourth fixing groove (51) is disposed opposite to the second fixing groove (31). The adapter of the MT-FA testing equipment is inserted into the fourth fixing groove (51) and is suitable for driving the third fixing member (5) to move closer to the second fixing member (3) so that the adapter can be connected and cooperated with the connector.

8. A testing fixture for MT-FA testing according to claim 7, characterized in that, The base (1) is provided with a guide rod (13), and the third fixing member (5) is provided with a guide hole (52). The guide rod (13) passes through the guide hole (52) and is guided and engaged with the guide hole (52).

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