Groove-type structural rod ejection tool and clamping and flipping assembly of cigarette packaging machine

Abstract

The present invention discloses a groove-type structure rod ejection tool, comprising a support for inserting into a groove cavity of a groove-type structure and a screw extending along the groove width direction and threadedly connected to the support, the support comprising a connecting column and a first support body and a second support body arranged in parallel along the groove width direction, the two ends of the connecting column are respectively connected to the first support body and the second support body, the first support body has a working threaded hole that passes through along the groove width direction and is threadedly matched with the screw, one end of the screw is located between the first support body and the second support body when passing through the working threaded hole, and the other end is located between the first support body and the second support body and has a torque force applying part for applying torque. The groove-type structure rod ejection tool can effectively solve the problem of difficulty in ejecting rods on the groove wall of the groove-type structure. The present invention also discloses a clamping and flipping assembly of a cigarette packaging machine including the above-mentioned groove-type structure rod ejection tool.

Description

Technical Field

[0001] The present invention relates to the field of production equipment, and more specifically, to a groove-shaped structural rod ejecting tool, and also to a clamping and flipping assembly of a cigarette packaging machine comprising the groove-shaped structural rod ejecting tool. Background Art

[0002] In some current devices, rod structures such as shafts and sleeves are inserted into the base, and during the pre-installation process or during long-term use, the rods are locked and cannot be easily detached. It is necessary to apply a large thrust from the insertion end to eject the rod. In actual design and manufacturing, it is easy to form a base or other structural components with a stopper on one side of the rod insertion end, so that a very narrow groove space is formed between the stopper and the rod perforation outlet end on the base, making it difficult to use general tools to eject the rod, at least it is difficult to use a chisel hammer structure to apply hammering force to the rod from the insertion end side.

[0003] In summary, how to effectively solve the problem of the difficulty in ejecting the rods on the groove wall of the groove structure is an issue that the technicians in this field urgently need to solve. Summary of the invention

[0004] In view of this, the first object of the present invention is to provide a groove-type structure rod ejection tool, which can effectively solve the problem of difficulty in ejecting rods on the groove wall of the groove structure. The second object of the present invention is to provide a clamping and flipping assembly of a cigarette packaging machine including the above-mentioned groove-type structure rod ejection tool.

[0005] In order to achieve the above first object, the present invention provides the following technical solutions:

[0006] A groove-type structural rod ejection tool comprises a support for being inserted into a groove cavity of a groove-type structure and a screw extending along the groove width direction and threadedly connected to the support, the support comprising a connecting column and a first support body and a second support body arranged in parallel along the groove width direction, the two ends of the connecting column are respectively connected to the first support body and the second support body, the first support body has a working threaded hole that passes through along the groove width direction and cooperates with the screw thread, and when one end of the screw passes through the working threaded hole, the other end is located between the first support body and the second support body and has a torque applying portion for applying torque.

[0007] In the groove structure rod ejection tool, when it is used, it is applied to the groove structure whose groove width is not less than the support width, and then the support is inserted into the groove structure so that the first support body is close to the groove wall on one side with the ejection rod, and the second support body is against the groove wall on the other side, and the working threaded hole is aligned with the ejection rod, and is preferably coaxially arranged, and then the torque is applied to the screw through the torque application part of the screw so that the screw is screwed into the ejection rod, and after being against the insertion end of the ejection rod, the torque is continued to be applied, because the second support body is against the groove wall of the groove structure to obtain the supporting force in this direction, so at this time the screw continues to be screwed in to push the ejection rod to move until it loosens or exits the groove wall on this side of the groove structure. In the groove-type structure rod ejection tool, the narrow groove cavity space of the groove structure is taken into consideration, especially the limiting effect of the groove wall opposite to the ejection rod, and the above-mentioned groove-type structure rod ejection tool is set up, which is clamped in the groove structure through the support, and the second support body is used to resist the groove wall to obtain the support force in the ejection direction, and then the screw is rotated to convert the torque into axial thrust. The torque is easy to apply to ensure that the ejection rod obtains sufficient axial thrust, and then the rod in the groove structure can be easily ejected. In summary, the groove-type structure rod ejection tool can effectively solve the problem of difficulty in ejecting rods on the groove wall of the groove structure.

[0008] Preferably, the torque applying portion is a hexagonal screw head or a quadrangular screw head.

[0009] Preferably, a countersunk groove is formed at the end of the working threaded hole on a side of the first supporting body away from the second supporting body.

[0010] Preferably, it also includes a sleeve top column that is detachably fixed to the first support body or the second support body, the top diameter of the sleeve top column is larger than the diameter of the working threaded hole, and the countersunk groove can accommodate the top of the sleeve top column.

[0011] Preferably, a fixing threaded hole is provided on the first support body, and the threaded section of the sleeve top column is threadedly connected to the fixing threaded hole, the diameter of the threaded section is not larger than the diameter of the screw rod, and a positioning countersunk hole is provided at the top of the sleeve top column to cooperate with the top end of the screw rod.

[0012] Preferably, an arc-shaped positioning slot is provided at one side edge of the first support body, the fixing threaded hole is provided at the other side edge, and the working threaded hole is provided close to the edge of the arc-shaped positioning slot.

[0013] Preferably, the second support body is provided with an avoidance hole or an avoidance groove for the screw rod to pass from the second support body into the working threaded hole.

[0014] Preferably, the second support body is U-shaped, and two sides thereof are connected to the first support body through the connecting columns respectively.

[0015] Preferably, the countersunk groove forms an opening extending to the arc-shaped positioning groove on a side close to the arc-shaped positioning groove, so that the cross-section of the countersunk groove is U-shaped.

[0016] In order to achieve the above-mentioned second purpose, the present invention also provides a clamping and flipping assembly of a cigarette packaging machine, the clamping and flipping assembly of the cigarette packaging machine includes any one of the above-mentioned groove-type structure rod ejection tools, and also includes a flipping body, the flipping body includes a clamping claw, an intermediate column portion located in the middle, a flange plate arranged at one end of the intermediate column portion and a mounting shoulder portion fixed on the intermediate column portion, a shifting shaft for driving the clamping claw to rotate is passed through the mounting shoulder portion, the shifting shaft is exposed on the side of the mounting shoulder portion close to the flange plate, a bushing is arranged between the shifting shaft and the mounting shoulder portion, a gap is arranged between the flange plate and the mounting shoulder portion to form a groove-type structure, the support of the groove-type structure rod ejection tool is located between the flange plate and the mounting shoulder, and the second support body of the support is arranged to abut against the flange plate, the first support body of the support is arranged to be close to the mounting shoulder, and the cross-section of the top of the screw of the groove-type structure rod ejection tool is not larger than the cross-section of the shifting shaft and abuts against the insertion end of the shifting shaft. Since the above-mentioned groove-shaped structure rod ejection tool has the above-mentioned technical effects, the clamping and turning assembly of the cigarette packaging machine having the groove-shaped structure rod ejection tool should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a groove-shaped structural rod ejection tool support provided by an embodiment of the present invention;

[0019] Figure 2 A three-dimensional bottom-up structural schematic diagram of a groove-shaped structural rod ejection tool support provided by an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of the three-dimensional structure of a screw provided in an embodiment of the present invention;

[0021] Figure 4 A schematic diagram of the three-dimensional structure of a sleeve top column provided in an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of the three-dimensional structure of the clamping and flipping assembly of the cigarette packaging machine provided by the embodiment of the present invention when the push-out shaft is ejected;

[0023] Figure 6 for Figure 5 A schematic cross-sectional structure diagram of the clamping and flipping assembly of the cigarette packaging machine when the ejection shaft is ejected;

[0024] Figure 7 A schematic diagram of the surface structure of the clamping and flipping assembly of the cigarette packaging machine provided in an embodiment of the present invention when the shaft sleeve is ejected.

[0025] The following are marked in the accompanying drawings:

[0026] Support 1, screw 2, sleeve top column 3, clamping claw 4, intermediate column 5, flange 6, mounting shoulder 7, sleeve 8, shift shaft 9, connecting column 11, first support body 12, second support body 13, working threaded hole 14, countersunk groove 15, fixed threaded hole 16, arc-shaped positioning slot 17, avoidance groove 18, top 31, threaded section 32, positioning countersunk hole 33, arc-shaped avoidance notch 34. DETAILED DESCRIPTION

[0027] The embodiment of the invention discloses a groove structure rod ejecting tool, which effectively solves the problem of difficulty in ejecting the rod on the groove wall of the groove structure.

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-Figure 7 , Figure 1 A schematic diagram of the three-dimensional structure of a groove-shaped structural rod ejection tool support provided by an embodiment of the present invention; Figure 2 A three-dimensional bottom-up structural schematic diagram of a groove-shaped structural rod ejection tool support provided by an embodiment of the present invention; Figure 3 A schematic diagram of the three-dimensional structure of a screw provided in an embodiment of the present invention; Figure 4 A schematic diagram of the three-dimensional structure of a sleeve top column provided in an embodiment of the present invention; Figure 5 A schematic diagram of the three-dimensional structure of the clamping and flipping assembly of the cigarette packaging machine provided by the embodiment of the present invention when the push-out shaft is ejected; Figure 6 for Figure 5 A schematic cross-sectional structure diagram of the clamping and flipping assembly of the cigarette packaging machine when the ejection shaft is ejected; Figure 7 A schematic diagram of the surface structure of the clamping and flipping assembly of the cigarette packaging machine provided in an embodiment of the present invention when the shaft sleeve is ejected.

[0030] In a specific embodiment, this embodiment provides a slot-type structure rod ejection tool, which is mainly used to eject a rod that is inserted into the slot wall of the slot-type structure in the slot-type structure, such as a clamping and flipping assembly used in a cigarette packaging machine, wherein a slot-type structure is formed between the flange 6 and the mounting shoulder 7, wherein the shifting shaft is the ejection rod, which is inserted into the mounting shoulder 7 and exposed on the side of the mounting shoulder 7 close to the flange 6. Specifically, the slot-type structure rod ejection tool includes a support 1 and a screw 2.

[0031] The support 1 is used to be inserted into the groove cavity of the groove structure, that is, to be inserted between the groove walls on both sides of the groove structure to form a support by the groove walls on both sides, and especially needs to be abutted against the groove wall opposite to the ejection rod in the groove structure, and the screw rod 2 extends along the groove width direction and is threadedly connected to the support 1 to be used to abut against the ejection rod, so that when rotating, it can push the ejection rod to move along the axial direction to push out the ejection rod.

[0032] Specifically, the support 1 includes a connecting column 11, a first support body 12 and a second support body 13, wherein the first support body 12 and the second support body 13 are arranged side by side along the groove width direction, wherein the first support body 12 is used to lean against the groove wall with the ejection rod passing through the groove wall on both sides of the groove structure, and the second support body 13 is used to abut against the groove wall opposite to the ejection rod in the groove structure. The first support body 12 and the second support body 13 are generally plate-like structures to facilitate support and to make enough space to facilitate the operation of the screw 2. The two ends of the connecting column 11 are respectively connected to the first support body 12 and the second support body 13, and the connection can be an integral molding connection, or it can be welded, screwed, etc. When the first support body 12 and the second support body 13 are both plates, they are arranged in parallel and are both arranged perpendicular to the connecting column 11.

[0033] The first support body 12 has a working threaded hole 14 that passes through along the groove width direction, and the working threaded hole 14 is threadedly matched with the screw rod 2 so that the screw rod 2 can be screwed into the working threaded hole 14, and the working threaded hole 14 is set through so that the screw rod 2 can be exposed at both ends of the working threaded hole 14, that is, the screw rod 2 is exposed on both sides of the first support body 12. Specifically, when one end of the screw rod 2 passes through the working threaded hole 14, it can abut against the insertion end of the ejector rod on the groove wall corresponding to the groove structure, and the other end of the screw rod 2 is located between the first support body 12 and the second support body 13 and has a torque applying part for applying torque. Torque can be applied through the torque applying part so that the screw rod 2 is screwed into the ejector rod, and the screw rod 2 continues to rotate, which can push the ejector rod to move in a direction away from the groove structure to exit the groove structure.

[0034] In the groove structure rod ejection tool, when it is used, it is applied to the groove structure whose groove width is not less than the width of the support 2, and then the support 2 is inserted into the groove structure so that the first support body 12 is close to the groove wall on one side with the ejection rod, and the second support body 13 is against the groove wall on the other side, and the working threaded hole 14 is aligned with the ejection rod, and is preferably coaxially arranged, and then the torque is applied to the screw 2 through the torque application part of the screw 2 so that the screw 2 is screwed into the ejection rod, and after being against the insertion end of the ejection rod, the torque is continued to be applied, because the second support body 13 is against the groove wall of the groove structure to obtain the supporting force in this direction, so at this time the screw 2 continues to be screwed in to push the ejection rod to move until it loosens or exits the groove wall on this side of the groove structure. In the groove-type structure rod ejection tool, the narrow groove cavity space of the groove structure, especially the limiting effect of the groove wall opposite to the ejection rod, is taken into consideration, and the above-mentioned groove-type structure rod ejection tool is provided, through the support 1 stuck in the groove structure, and the second support body 13 is against the groove wall to obtain the support force in the ejection direction, and then the screw 2 rotates to convert the torque into axial thrust, and the torque is easy to apply to ensure that the ejection rod obtains sufficient axial thrust, and then the rod in the groove structure can be easily ejected. In summary, the groove-type structure rod ejection tool can effectively solve the problem of difficulty in ejecting rods on the groove wall of the groove structure.

[0035] Furthermore, in order to facilitate the torque application of the torque force applying part, a radial through hole is provided, so that when in use, a corresponding rod is selected, so that one end of the rod is inserted into the radial through hole, and then the other end of the rod is pushed to transfer torque to the screw rod, but this operation is more troublesome. Based on this, the torque force applying part is preferably a hexagonal screw head or a square screw head. At this time, the screw rod 2 can be selected as the screw rod of the bolt, and the nut of the bolt can be correspondingly arranged on the first support body 12, so that there is no need to open another threaded hole on the first support body 12.

[0036] Furthermore, considering that a sleeve 8 is generally provided between the groove structure and the ejection rod, the ejection rod needs to be ejected from the sleeve 8 first, and then the sleeve 8 is ejected from the groove structure. In order to facilitate further ejection of the sleeve, it is preferred that a countersunk groove 15 is formed at the end of the working threaded hole 14 on the side of the first support body 12 away from the second support body 13, so that an intermediate force transmission member can be placed in the countersunk groove 15, and the cross-section of the intermediate force transmission member is larger than the cross-section of the ejection rod, but not larger than the outer contour cross-section of the sleeve, so that one end of the intermediate force transmission member is against the screw to receive force, and the other end is against the sleeve to apply force to the sleeve. Through the countersunk groove 15, an intermediate force transmission member with a cross-section larger than the intermediate ejection rod can be placed, thereby realizing force transmission between the screw 2 and the sleeve 8.

[0037] Furthermore, the intermediate force transmission member can be selected and applied according to the actual cross-sectional size of the sleeve. In order to avoid the intermediate force transmission member being placed randomly and easily lost during long-term use. Based on this, it is preferred that a sleeve top column 3 detachably fixed on the first support body 12 or the second support body 13 is also included here, and the sleeve top column 3 is the above-mentioned intermediate force transmission member, and the diameter of the top 31 of the sleeve top column 3 is larger than the diameter of the working threaded hole 14, and the countersunk groove 15 can accommodate the top 31 of the sleeve top column 3, so that when in use, one side of the top 31 of the sleeve top column 3 is against the screw 2, and the other side is against the end of the sleeve 8.

[0038] The sleeve top column 3 is detachably fixedly connected to the first support body 12 or the second support body 13, such as snap-on, magnetic or other detachable connection methods. In order to facilitate the connection, it is preferred that a fixed threaded hole 16 is provided on the first support body 12, and the threaded section 32 of the sleeve top column 3 is threadedly connected to the fixed threaded hole 16, so that the threaded section 32 can be a part of the top of the sleeve top column 3, or the threaded section 32 can be provided separately. It is preferred that the threaded section 32 is provided separately, and the diameter of the threaded section 32 is preferably not greater than the inner diameter of the sleeve, so that when in use, the threaded section 32 of the sleeve top column 3 is inserted into the inner hole of the sleeve, and the threaded section 32 is provided on one side of the top 31 of the sleeve top column 3. Specifically, the sleeve top column 3 can select an inner hexagonal screw, or other similar T-shaped structures. Further, in order to better transmit force between the screw 2 and the sleeve top column 3, it is preferred that a positioning countersunk hole 33 is provided at the top of the sleeve top column 3 to match the top of the screw 2. In order to facilitate avoidance, an arc-shaped avoidance notch 34 may be provided on one side of the top of the sleeve top column 3 .

[0039] Furthermore, for the convenience of installation, the countersunk groove 15 is preferably formed with an opening extending to the arc-shaped positioning groove 17 on one side close to the arc-shaped positioning groove 17, so that the cross section of the countersunk groove 15 is U-shaped. At this time, the sleeve top column 3 can be first inserted to the sleeve 8, and the threaded section 32 of the sleeve top column 3 is inserted into the sleeve 8, and the top 31 of the sleeve top column 3 is located at the end of the sleeve. At this time, the support 2 is installed, and when the first support body 12 moves inward in accordance with the groove wall of the groove structure, the head 31 of the sleeve top column 3 enters the countersunk groove 15 from the opening of the countersunk groove 15, so that the sleeve top column 3 can be aligned with the screw 2 on the first support body 12.

[0040] Furthermore, in order to facilitate avoidance and ensure that there is a larger support surface between the first support body 12 and the groove wall with the ejector rod, it is preferred that an arc-shaped positioning groove 17 is provided on one side edge of the first support body 12 to be clamped on the connecting column between the groove walls on both sides of the groove structure. The above-mentioned fixed threaded hole 16 is provided on the other side edge of the first support body 12 to fix the sleeve ejector column 3. The working threaded hole 14 is provided close to the edge of the arc-shaped positioning groove. Correspondingly, in order to facilitate the insertion of the screw 2 into the first support body 12, it is preferred that an avoidance hole or avoidance groove 18 is provided on the second support body 13 to allow the screw 2 to penetrate from the second support body 13 into the working threaded hole 14.

[0041] Furthermore, the second support body 13 may be U-shaped, so that the second support body 13 can avoid the corresponding movement by forming a U-shaped structure of the second support body 13, wherein the U-shaped opening of the second support body 13 is oriented in the same direction as the notch of the arc-shaped positioning slot 17. In order to better transmit the force between the first support body 12 and the second support body 13, it is preferred that both sides of the second support body 13 are connected to the first support body 12 through the connecting column 11.

[0042] Based on the groove-type structure rod ejection tool provided in the above-mentioned embodiments, the present invention also provides a clamping and flipping assembly of a cigarette packaging machine, which includes any one of the groove-type structure rod ejection tools in the above-mentioned embodiments, and also includes a flipping body, wherein the flipping body includes a clamping claw 4, an intermediate column 5 located in the middle, a flange 6 arranged at one end of the intermediate column 5 and a mounting shoulder 7 fixed on the intermediate column 5, a shifting shaft 9 for driving the clamping claw 4 to rotate is passed through the mounting shoulder 7, the shifting shaft 9 is exposed on the side of the mounting shoulder 7 close to the flange 6, a shaft sleeve is arranged between the shifting shaft 9 and the mounting shoulder 7, and a gap is arranged between the flange 6 and the mounting shoulder 7 to form a groove structure. The support of the slot-shaped structural rod ejection tool is located between the flange 6 and the mounting shoulder 7, and the second support body 13 of the support 2 is arranged against the flange 6, and the first support body 12 of the support 2 is arranged close to the mounting shoulder 7. The cross section of the top of the screw of the slot-shaped structural rod ejection tool is not larger than the cross section of the shifting shaft 9 and is against the insertion end of the shifting shaft 9. Since the clamping and flipping assembly of the cigarette packaging machine adopts the slot-shaped structural rod ejection tool in the above embodiment, please refer to the above embodiment for the beneficial effects of the clamping and flipping assembly of the cigarette packaging machine.

[0043] The flip body is used to flip the clamped cigarette group to facilitate the next process. The clamping jaws 4 of the flip body mainly have two groups, and the two groups of clamping jaws are set away from each other to clamp a group of cigarettes respectively. The shifting shaft 9 is driven by the cam to rotate, so as to drive the clamping jaws 4 to open and close during the rotation.

[0044] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0045] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A slotted structural rod ejection tool, characterized in that: It comprises a support for being inserted into a groove cavity of a groove-shaped structure and a screw extending in the groove width direction and being threadedly connected to the support, the support comprising a connecting column and a first supporting body and a second supporting body arranged in parallel in the groove width direction, the two ends of the connecting column are respectively connected to the first supporting body and the second supporting body, the first supporting body has a working threaded hole that passes through in the groove width direction and is threadedly matched with the screw, one end of the screw is located between the first supporting body and the second supporting body when passing through the working threaded hole, and has a torque applying portion for applying torque; A countersunk groove is formed at the end of the working threaded hole on one side of the first support body away from the second support body; It also includes a sleeve top column detachably fixed to the first support body or the second support body, the top diameter of the sleeve top column is larger than the working threaded hole diameter, and the countersunk groove can accommodate the top of the sleeve top column; The first support body is provided with a fixed threaded hole, the threaded section of the sleeve top column is threadedly connected to the fixed threaded hole, the diameter of the threaded section is not greater than the diameter of the screw, and the top of the sleeve top column is provided with a positioning countersunk hole to match the top end of the screw; An arc-shaped avoidance notch is arranged on one side of the top of the shaft sleeve top column.

2. The groove structure rod ejection tool according to claim 1, characterized in that: The torque applying part is a hexagonal screw head or a quadrangular screw head.

3. The groove structure rod ejection tool according to claim 1, characterized in that: An arc-shaped positioning slot is arranged at one side edge of the first support body, and the fixing threaded hole is arranged at the other side edge, and the working threaded hole is arranged close to the edge of the arc-shaped positioning slot.

4. The groove structure rod ejection tool according to claim 3, characterized in that: The second support body is provided with an avoidance hole or an avoidance groove for the screw rod to pass from the second support body into the working threaded hole.

5. The groove structure rod ejection tool according to claim 4, characterized in that: The second support body is U-shaped, and two sides thereof are connected to the first support body through the connecting columns respectively.

6. The groove structure rod ejection tool according to claim 5, characterized in that: The countersunk groove forms an opening extending to the arc-shaped positioning slot on a side close to the arc-shaped positioning slot, so that the cross section of the countersunk groove is U-shaped.

7. A clamping and flipping assembly of a cigarette packaging machine, comprising a flipping body, the flipping body comprising a clamping claw, an intermediate column located in the middle, a flange arranged at one end of the intermediate column, and a mounting shoulder fixed to the intermediate column, a shifting shaft for shifting the clamping claw to rotate is passed through the mounting shoulder, the shifting shaft is exposed on a side of the mounting shoulder close to the flange, a sleeve is arranged between the shifting shaft and the mounting shoulder, a gap is arranged between the flange and the mounting shoulder to form a groove structure, characterized in that: It also includes the groove-type structural rod ejection tool as described in any one of claims 1 to 6, wherein the support of the groove-type structural rod ejection tool is located between the flange and the mounting shoulder, and the second support body of the support is arranged to abut against the flange, and the first support body of the support is arranged toward the mounting shoulder, and the cross-section of the top of the screw of the groove-type structural rod ejection tool is not larger than the cross-section of the shift shaft and abuts against the insertion end of the shift shaft.

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