JP4000686B2 - Shock absorbing mechanism of motor power transmission device and shock absorbing mechanism of cassette loading device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor power transmission device that transmits a driving force of a motor, the shock absorbing mechanism of the motor power transmission device that absorbs an impact transmitted from a power output side via a power transmission system, and the driving force of the motor The cassette loading apparatus for loading a cassette in the above-described manner relates to an impact absorbing mechanism of the cassette loading apparatus that absorbs an impact transmitted from the cassette holder side through a power transmission system.
[0002]
[Prior art]
A motor power transmission device having a motor and a power transmission system for transmitting the driving force is used in various devices, for example, a cassette loading device of a VTR (video tape recorder). This cassette loading apparatus has a cassette holder for holding a cassette, and loads the cassette holder between a cassette insertion position and a cassette mounting position. That is, when the user inserts a cassette into the cassette holder located at the cassette insertion position and the cassette is inserted to a predetermined position, the cassette loading device is driven to move the cassette holder to the cassette mounting position. When a cassette eject command is issued at the cassette mounting position, the cassette loading device is driven to move the cassette holder to the cassette insertion position, and the user can pull out the cassette.
[0003]
Since the cassette loading apparatus that performs such an operation includes a part that the user directly touches and operates, the cassette may be inserted into the cassette holder under severe use conditions, for example, with an insertion force that is more than necessary. The insertion of a cassette with a high impact deforms or destroys the driving parts and peripheral parts of the cassette loading device, and conventionally, the following means have been taken as shock absorbing means.
[0004]
As a first means, the component itself is reinforced such as increasing the gear tooth thickness.
[0005]
As a second means, a motor (coreless motor) having a small initial torque (inherent rotational torque of the motor itself in a no-load state) is used, and the impact force is absorbed by the motor.
[0006]
As a third means, the friction is absorbed by the friction clutch gear structure, and FIG. 7 shows an exploded perspective view of the friction clutch gear structure. In FIG. 7, the small gear 50 is press-fitted into one end side of a metal shaft 51, and the metal shaft 51 is integrated with a metal spacer 52 and a pad 53, and a large gear 54, a pad 55 and a metal spacer 56 is integrated with this. Inserted in order. The large gear 54 is rotatably supported by the metal shaft 51 and is disposed in a state of being interposed between the pair of pads 53 and 55. Further, a conical spring 57 and a metal spacer 58 are inserted in this order into the metal shaft 51, and an E-ring 59 for preventing component removal is engaged with the other end of the metal shaft 51.
[0007]
In other words, since the large gear 54 is held between the pair of pads 53 and 55 by the spring force of the conical spring 57, it normally rotates with the metal shaft 51 and transmits the rotation of the metal shaft 51 to the output side gear. When a rotational load of a certain level or more is applied from the output side, it rotates independently against the frictional force of the pair of pads 53 and 57, thereby absorbing the impact.
[0008]
Further, as a fourth means, a spring having a long coil length is used as a joint part, and the impact is absorbed by expansion and contraction of the spring.
[0009]
[Problems to be solved by the invention]
However, in the first means, the impact force is merely transferred to a portion other than the strengthened portion, so that it becomes a so-called “weasel play” and is not very effective.
[0010]
The second means has a problem that the cost of the motor is about 20 times as high as that of a general-purpose product, resulting in a significant increase in cost.
[0011]
In the third means, the friction clutch gear structure has a large number of parts as shown in FIG. 7, and the assembly is difficult and the cost is high. Further, since the performance is determined by the pressing force of the conical spring 57 and the frictional force of the pair of pads 53 and 55, setting and management of the spring load is troublesome.
[0012]
The fourth means requires a coil length equal to or longer than the cassette insertion stroke, and in order to obtain a sufficient buffering effect, the coil length must be increased so that the load change of the spring does not fluctuate significantly due to expansion and contraction. Therefore, a large space is required for the layout of the cassette loading apparatus. In addition, the reaction force from the spring that tries to push back the cassette with respect to the cassette insertion stroke increases in proportion, so the feel during cassette insertion is not very good.
[0013]
The same problems can be said for the motor power transmission devices other than the cassette loading device except for the cassette insertion feeling.
[0014]
Therefore, the present invention has been made to solve the above-described problems, has a small number of parts, does not require the use of an expensive motor, is low in cost, and has a compact configuration and a layout in a small space. An object of the present invention is to provide a shock absorbing mechanism of a motor power transmission device that is possible and does not require strict setting and management of a spring load. Another object of the present invention is to provide an impact absorbing mechanism for a cassette loading device that does not interfere with the cassette insertion feel.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is characterized in that a shaft guide is fixed to a rotating shaft that is rotated by driving of a motor, and a shaft in which a worm gear is fixed on an axis extension line of the rotating shaft that fixes the shaft guide. The shaft is configured to be rotatable and movable between a first position and a second position in the axial direction, the shaft is held on the first position side in the axial direction, and is more than a certain level. A shaft position holding means that allows movement to the second position side when a pressing force of is applied is provided, and the shaft guide and the shaft are connected via a connecting means, and the connecting means is configured such that the shaft is positioned at the shaft position. wherein in the first position side position held by the holding means and the shaft guide and the shaft is engaged with the shaft guide and the shaft rotate integrally, and, said shaft impact When the shaft is displaced to the second position side in the axial direction so as to face the holding force of the shaft position holding means, the shaft guide and the shaft are disengaged and the shaft is subjected to the impact. The shaft guide and the shaft are re-engaged after rotating by force and after the impact force disappears.
[0016]
Another feature of the present invention is that a shaft guide is fixed to a rotating shaft that is rotated by driving of a motor, a shaft on which a worm gear is fixed is disposed on an axis extension line of the rotating shaft that fixes the shaft guide, and the shaft is It is configured to be rotatable and movable between a first position and a second position in the axial direction, and when the shaft is held on the first position side in the axial direction and a pressing force of a certain level or more is applied. A shaft position holding means for allowing movement to the second position side is provided, and the shaft guide and the shaft are connected via a connecting means. The connecting means is configured so that the shaft is held by the holding force of the shaft position holding means. wherein at the position of the first position side which is held the shaft guide and the shaft and is engaged with the shaft guide and the shaft rotate integrally, and the worm gear is subjected to an impact force Thus, when the shaft is displaced to the second position side in the axial direction against the holding force of the shaft position holding means, the engagement between the shaft guide and the shaft is released and the shaft is rotated by the impact force. In addition, after the impact force disappears, the shaft guide and the shaft are engaged again.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0018]
1 to 6 show an embodiment of the present invention. In this embodiment, the motor power transmission device is a cassette loading device of a VTR (video tape recorder). 4 is a side view of the cassette loading device in a normal state, FIG. 5 is a side view of the cassette loading device when subjected to a high impact, and FIG. 6 is an exploded perspective view of the main part near the motor.
[0019]
4 and 5, a pair of side plates 2 and 2 (only one is shown in the drawing, the other is not shown. The same applies hereinafter) are provided on the chassis 1 at intervals. Holder guide grooves 3 are provided at two locations on the respective inner side surfaces of the pair of side plates 2 and 2. Each holder guide groove 3 includes a horizontal portion and a vertical portion continuous at the rear end thereof, and each guide pin 5 of the cassette holder 4 is inserted into each holder guide groove 3.
[0020]
The cassette holder 4 has a frame shape capable of holding the cassette K, and is disposed in a space between the pair of side plates 2 and 2. The cassette holder 4 is configured to be guided by the holder guide groove 3 so as to move between the cassette insertion position (the position shown in FIGS. 4 and 5) and the cassette mounting position. At the cassette insertion position, it is close to a cassette insertion slot (not shown), and the user can insert the cassette K into the cassette holder 4 from the cassette insertion slot, and pull out the cassette K inserted into the cassette holder 4 from the cassette insertion slot. Can be done.
[0021]
As shown in FIG. 6, the motor 6 is fixed to one side plate 2, 2 using a motor bracket 7, and the rotation of the rotating shaft 6 a of the motor 6 is engaged with the worm gear 9 via the shock absorbing mechanism 8. It is configured to be transmitted to the wheel 10. The configuration of the shock absorbing mechanism 8 will be described later.
[0022]
The worm wheel 10 is rotatably supported by one side plate 2, 2 and the motor bracket 7, and a small-diameter gear 11 is integrally fixed to the worm wheel 10. A large-diameter intermediate gear 12 is engaged with the small-diameter gear 11, and the large-diameter intermediate gear 12 is rotatably supported by one side plate 2 and the motor bracket 7. A small-diameter intermediate gear 13 is integrally fixed to the large-diameter intermediate gear 12, and the small-diameter intermediate gear 13 meshes with one intermittent gear 14.
[0023]
The one intermittent gear 14 is connected to the other intermittent gear (not shown) disposed on the side of the other side plate (not shown) via a rotating shaft 15, and the pair of intermittent gears 14 and 4 are A pair of side plates 2 and 2 are rotatably supported. A swing arm 16 is fixed to each intermittent gear 14, and a cam groove 17 is provided on the distal end side of each swing arm 16. Each cam groove 17 is engaged with a guide pin 5 of the cassette holder 4.
[0024]
1 is an exploded perspective view showing an impact absorbing mechanism of the cassette loading apparatus, FIG. 2 is a sectional view showing the normal state of the impact absorbing mechanism, and FIG. 3 is a sectional view showing when the impact absorbing mechanism is subjected to a high impact. is there.
[0025]
1 to 3, the impact absorbing mechanism 8 has a shaft guide 18, and the shaft guide 18 is fixed to the rotating shaft 6 a of the motor 6 by press fitting. A shaft insertion hole 18a is formed in the shaft guide 18, and an engagement groove 18b that communicates with the shaft insertion hole 18a and extends in the radial direction at intervals of 120 degrees is formed. The shaft guide 18 is formed with a retracting chamber 18c for an engaging projection 19a, which will be described later, and the retracting chamber 18c opens into the engaging groove 18b.
[0026]
The shaft 19 is arranged on an axis extension line of the rotating shaft 6a to which the shaft guide 18 is fixed, and an engaging protrusion 19a that protrudes in the radial direction at 120 ° rotation intervals is provided on one end side of the shaft 19. One end side of the shaft 19 provided with the engagement protrusion 19a is inserted into the shaft guide 18 using the shaft insertion hole 18a and the engagement groove 18b.
[0027]
The engaging groove 18b and the engaging protrusion 19a constitute a connecting means 21 for connecting the shaft guide 18 and the shaft 19, and the shaft guide 18 and the shaft 19 are integrally rotated in both engaged states. . In a state where the engaging protrusion 19a has escaped from the engaging groove 18b to the retracting chamber 19c, the shaft guide 18 and the shaft 19 are rotated independently.
[0028]
Further, when the engaging protrusion 19a enters the engaging groove 18b from the retracting chamber 19c, the engaging protrusion 19a is inserted into the engaging groove 18b at each entrance side of the engaging groove 18b and the engaging protrusion 19a. In order to facilitate, taper portions 22 and 23 (shown in FIGS. 2 and 3) are formed respectively.
[0029]
The other end side of the shaft 19 is rotatably supported by the motor bracket 7 via a pivot bearing 24, and the pivot bearing 24 is configured so as not to drop off when shifted within a certain distance in the axial direction of the shaft 19. That is, the first position where the engagement protrusion 19a on the other end side engages with the engagement groove 18b while maintaining the state where the shaft 19 is rotatably supported by the pivot bearing 24 and the shaft guide 18 (position in FIG. 2). And a second position (the position shown in FIG. 3) that is separated from the engaging groove 18b and enters the retreat chamber 18c.
[0030]
A worm gear 9 is inserted into the shaft 19. The worm gear 9 is engaged so as to rotate integrally with the shaft 19, and the movement in the axial direction is restricted by the E ring 25 and is prevented from coming off from the shaft 19. Further, a compression coil spring 26 serving as a shaft position holding means and a disk-like polyslider 20 are inserted into the shaft 19, and the compression coil spring 26 is interposed between the worm gear 9 and the polyslider 20.
[0031]
The shaft 19 is urged toward the first axial position (in the direction of the arrow A in FIG. 2) by the spring force of the compression coil spring 26, and the engagement protrusion 19a is engaged with the engagement groove 18b by this urging force. Held at the mating position. The polyslider 20 serves as a sliding surface for the compression coil spring 26 that rotates together with the worm gear 9 while restricting one end of the shaft 19 from coming out of the shaft guide 18 by the spring force of the compression coil spring 26.
[0032]
Next, the operation of the above configuration will be described. As shown in FIG. 4, when the cassette holder 4 is in the cassette insertion position and the user inserts the cassette K into the cassette holder 4 and the cassette K is inserted to the predetermined insertion position, for example, a cassette-in switch is turned on. Then, the motor 6 is driven. When the motor 6 is driven, the rotating shaft 6a of the motor 6 is rotated, and the shaft guide 18 is rotated by this rotation. Here, as shown in FIG. 2, the shaft 19 is positioned on the first position side in the axial direction by the spring force of the compression coil spring 26, and the engagement protrusion 19a is engaged with the engagement groove 18b. Therefore, the rotation of the shaft guide 18 is transmitted to the shaft 19 via the connecting means 21.
[0033]
The worm gear 9 rotates together with the shaft 19, and the worm wheel 10 rotates by this rotation. This rotation is transmitted from the small diameter gear 11 to the large diameter intermediate gear 12 and from the small diameter intermediate gear 13 to the pair of intermittent gears 14, 14. When the pair of intermittent gears 14 and 14 rotate, the pair of turning arms 16 and 16 rotate together. The guide pins 5 of the cassette holder 4 are pressed by the rotation of the pair of turning arms 16, 16, and the cassette pins 5 move in the holder guide groove 3. By moving the cassette pin 5 in the holder guide groove 3, the cassette holder 4 is moved from the cassette insertion position to the cassette mounting position.
[0034]
In the above operation process, as shown in FIG. 5, the user may insert the cassette K into the cassette holder 4 with a high impact, and when such an insertion is made, the impact force is applied to the power transmission system described above. Is transmitted through. That is, it is transmitted to the cassette holder 4, the turning arm 16, the intermittent gear 14, the small diameter intermediate gear 13, the large diameter intermediate gear 12, and the worm wheel 10, and further transmitted from the worm wheel 10 to the worm gear 9.
[0035]
Then, a rotational force and an axial force F act on the worm gear 9 by the transmitted impact force, and when this axial force F is stronger than the spring force of the compression coil spring 26, FIG. As shown, the shaft 19 moves against the spring force toward the second position in the axial direction (in the direction of arrow B in FIG. 2). Then, the engaging protrusion 19a of the shaft 19 is separated from the engaging groove 18b of the shaft guide 18 and enters the retracting chamber 18c. Thus, when the engagement between the engagement protrusion 19a and the engagement groove 18b is disengaged, the shaft 19 becomes almost unloaded and can be rotated independently. Therefore, the shaft 19 is rotated by the force in the rotational direction of the impact force. This will release the impact force. Therefore, even when the user inserts the cassette K into the cassette holder 4 with a high impact, neither the parts of the power transmission system nor the peripheral parts are deformed or damaged.
[0036]
When the impact force disappears, the shaft 19 is pressed toward the first position in the axial direction by the spring force of the compression coil spring 26. With this pressing force, the shaft 19 moves in the direction of the arrow A in FIG. 19a reenters the engaging groove 18b, and the subsequent cassette loading operation becomes possible. Here, when the engaging protrusion 19a is inserted into the engaging groove 18b, both the inlet sides are formed by the tapered portions 22 and 23, and the insertion is guided by the tapered portions 22 and 23, so that the insertion is smoothly performed. Is done.
[0037]
The shock absorbing mechanism 8 can be composed of a shaft guide 18, a shaft 19 movable in the axial direction, a connecting means 21 for connecting them, a compression coil spring (shaft position holding means) 26, a polyslider 20, and the like. The number is low and the cost is low. The shock absorbing mechanism 8 is assembled by pressing the shaft guide 18 into the rotating shaft 6a of the motor 6 while inserting the polyslider 20, the compression coil spring 26, and the worm gear 9 into the shaft 19 in this order from the other end. The ring 25 is used for mounting. One end of the shaft 19 is inserted into the shaft guide 18. Then, one end side (engagement protrusion 19a) of the shaft 19 is inserted into the retracting chamber 18c of the shaft guide 18 against the spring force of the compression coil spring 26, and the other end of the shaft 19 is attached to the motor bracket 7. Since it is completed by inserting it into the pivot bearing 24, and the assembly is easy, the cost is low.
[0038]
Further, since the impact absorbing mechanism 8 does not need to use a long-span spring as in the prior art, the compact structure enables a layout in a small space. Further, it is not necessary to use a motor (coreless motor) having a small initial torque (inherent rotational torque of the motor itself in a no-load state), and it is sufficient to use an inexpensive motor 6. .
[0039]
Furthermore, since the minimum impact force absorption point (setting of impact resistance) is determined by the performance of the spring force (holding force) of the compression coil spring (shaft position holding means) 26 alone, the exact setting of the spring (holding) load No management is required. Furthermore, since there is no reaction force from the spring that tries to push the cassette K back against the cassette K insertion stroke, there is no hindrance to the cassette insertion feel.
[0040]
In the above embodiment, the shaft position holding means is constituted by the compression coil spring 26. However, when the shaft 19 is held on the first position side in the axial direction and a pressing force of a certain level or more is applied, the second position is maintained. Any device that allows movement to the position side may be used. However, if the biasing means such as the compression coil spring 26 is used as the shaft position holding means, when the impact force is lost, the engaging protrusion 19a reenters the engaging groove 18b by the biasing force as described above, There is an advantage that the subsequent cassette loading operation becomes possible. As the biasing means, an elastic body (for example, rubber) or the like may be used in addition to the spring. However, it is preferable to use a spring because it is easy to set and manage a load (spring force) and is excellent in durability and the like.
[0041]
In the above embodiment, the engaging groove 18b is integrally provided in the shaft guide 18, and the engaging protrusion 19a is integrally provided in the shaft 19, so that these are provided as members separate from the shaft guide 18 and the shaft 19. Also good. However, if it is provided integrally as in this embodiment, the number of parts is reduced.
[0042]
In addition, according to the embodiment, the case where the motor power transmission device is a cassette loading device of a VTR (video tape recorder) has been described. However, an audio cassette, a disc (CD, MD, floppy disc, etc.), or those on a tray. The present invention can be applied not only to a loading device that loads by loading, but also to all motor power transmission devices in which an impact is transmitted to a power transmission system.
[0043]
According to the embodiment, the shock absorbing mechanism 8 is provided in the vicinity of the motor 6 by fixing the shaft guide 18 to the rotating shaft 6a of the motor 6 itself. It is not limited, but is appropriately determined from the component arrangement of the power transmission system, space, and the like.
[0044]
In addition, according to the said embodiment, although the taper parts 22 and 23 were formed in the entrance side of both the engagement protrusion part 19a and the engagement groove 18b, you may provide only in any one. However, if both are provided, the insertion becomes smoother.
[0045]
【The invention's effect】
As described above, according to the first aspect of the present invention, the shaft guide is fixed to the rotating shaft that is rotated by the drive of the motor, and the shaft in which the worm gear is fixed on the axis extension line of the rotating shaft that fixes the shaft guide. The shaft is configured to be rotatable and movable between a first position and a second position in the axial direction, the shaft is held on the first position side in the axial direction, and is constant. A shaft position holding means that allows movement to the second position side when the above pressing force is applied is provided, and the shaft guide and the shaft are connected via a connecting means. The connecting means is configured so that the shaft is connected to the shaft. The shaft guide and the shaft are engaged with each other at a position on the first position side held by the position holding means so that the shaft guide and the shaft rotate integrally, and the shaft position When the shaft is displaced to the second position side in the axial direction against the holding force of the holding means, the shaft guide and the shaft are disengaged, and the shaft guide and the shaft are independently rotatable. Since the shock absorbing mechanism of the motor power transmission device is configured as described above, when the impact force from the power output side acts on the worm gear, the axial external force acting on the worm gear resists the biasing force of the biasing means. Since the shaft moves to the second position side in the axial direction, the connection of the connecting means is disengaged, and the shaft rotates in an unloaded state, so that the number of parts is small and an expensive motor is used. It is not necessary and is low in cost, can be laid out in a small space with a compact configuration, and does not require strict setting and management of the spring load. It is possible to provide a hammer absorption mechanism.
[0046]
According to invention of Claim 2, a shaft guide is fixed to the rotating shaft rotated by the drive of a motor, the shaft to which the worm gear was fixed is arrange | positioned on the axis extension line of the rotating shaft which fixed this shaft guide, and this shaft Is configured to be rotatable and movable between a first position and a second position in the axial direction, the shaft is held on the first position side in the axial direction, and a pressing force of a certain level or more is applied. Then, a shaft position holding means for allowing movement to the second position side is provided, and the shaft guide and the shaft are connected via a connecting means. The connecting means is configured such that the shaft is held by the shaft position holding means. The shaft guide and the shaft engage with each other at a position on the first position side so that the shaft guide and the shaft rotate integrally and resist the holding force of the shaft position holding means. Thus, when the shaft is displaced to the second position side in the axial direction, the engagement of the shaft guide and the shaft is disengaged, and the impact of the motor power transmission device is made such that the shaft guide and the shaft are independently rotatable. Since the absorbing mechanism is configured, when the impact force from the power output side acts on the worm gear, the shaft is opposed to the urging force of the urging means by the axial external force acting on the worm gear. Since the shaft is moved to the side and the connection of the connecting means is released and the shaft rotates in a no-load state, the number of parts is small, and it is not necessary to use an expensive motor, so that the cost is low and compact. As a simple structure, layout in a small space is possible, and strict setting and management of the spring load is not required, and the cassette insertion feel is not hindered. It can provide a shock absorbing mechanism of the set loading device.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an impact absorbing mechanism of a cassette loading apparatus according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a normal state of an impact absorbing mechanism of the cassette loading apparatus according to the embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a state where the impact absorbing mechanism of the cassette loading apparatus according to the embodiment of the present invention receives a high impact.
FIG. 4 is a normal side view of the cassette loading apparatus according to the embodiment of the present invention.
FIG. 5 is a side view of the cassette loading device according to the embodiment of the present invention when receiving a high impact.
FIG. 6 is an exploded perspective view of a main part in the vicinity of a motor according to an embodiment of the present invention.
FIG. 7 is an exploded perspective view of a friction clutch structure according to a conventional example.
[Explanation of symbols]
6 Motor 6a Rotating shaft 8 Shock absorbing mechanism 9 Worm gear 18 Shaft guide 18b Engaging groove 19 Shaft 19a Engaging protrusion 21 Connecting means 22, 23 Taper 26 Compression coil spring

Claims (2)

A shaft guide is fixed to the rotating shaft that is rotated by the drive of the motor, and a shaft with a worm gear fixed is arranged on the shaft extension line of the rotating shaft that fixes this shaft guide, and this shaft can be rotated freely and in the axial direction. The shaft is configured to be movable between the first position and the second position, and the shaft is held on the first position side in the axial direction. Providing shaft position holding means for allowing, connecting the shaft guide and the shaft via a connecting means;
The connecting means is configured such that the shaft guide and the shaft are engaged with each other at a position on the first position side where the shaft is held by the shaft position holding means, and the shaft guide and the shaft rotate integrally, and When the shaft receives an impact force, the shaft guide is disengaged from the shaft when the shaft is displaced to the second position side in the axial direction opposite to the holding force of the shaft position holding means. An impact absorbing mechanism for a motor power transmission device, wherein the shaft is rotated by the impact force, and the shaft guide and the shaft are engaged again after the impact force disappears . A shaft guide is fixed to a rotating shaft that is rotated by the drive of a motor, and a shaft with a worm gear fixed is arranged on an axis extension line of the rotating shaft that fixes the shaft guide. It is configured to be movable between the first position and the second position, the shaft is held on the first position side in the axial direction, and when the pressing force exceeds a certain level, the shaft moves to the second position side. Providing shaft position holding means for allowing, connecting the shaft guide and the shaft via a connecting means;
In this connection means, the shaft guide and the shaft are engaged with each other at the first position side where the shaft is held by the holding force of the shaft position holding means, and the shaft guide and the shaft rotate integrally. When the shaft is displaced to the second position side in the axial direction against the holding force of the shaft position holding means due to the impact force of the worm gear , the shaft guide and the shaft are engaged. And the shaft rotates by the impact force, and the shaft guide and the shaft are engaged again after the impact force disappears. mechanism.

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