JPH0143549Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a clutch switching device used, for example, in food processing mixers.

``Prior Art'' As a conventional clutch switching device of this type, there is one shown in Japanese Utility Model Publication No. 58-33892.

The conventional switching device has a first gear, a second gear, a third gear, and a fourth gear, each having a clutch pawl on the opposite side, rotatably supported on an idle shaft rotatably supported in the casing of the mixer. At the same time, the first
Between the gear and the second gear and between the third gear and the fourth gear,
Assuming a clutch mechanism that is movably supported by two clutch shafts with engaging pawls on both sides,
A plate cam that is rotated by an external handle operation is disposed inside the casing, and a support shaft is provided near the plate cam, and the cylindrical portions of a pair of operating rods are movably fitted onto the support shaft. The rollers provided at one end of each operating rod face each other and are pressed against the peripheral surface of the plate cam by spring pressure, and the other end is connected to each of the clutches.

Then, when the plate cam is rotated appropriately by operating an external handle and the pressure contact position of each roller with respect to the circumferential surface of the plate cam is changed, each operating rod moves on the support shaft according to the change in the pressure contact position of the roller. By moving the clutch in parallel in a predetermined direction and directly moving the clutch in the same direction at the other end of each operating rod, one clutch is brought into engagement with the clutch pawl of the first gear or the second gear, and at the same time, the other clutch is engaged with the clutch pawl of the first gear or the second gear. is engaged with the clutch pawl of the third or fourth gear.

Therefore, in the conventional switching device, by switching using such a plate cam, the gear supported on the input shaft is brought into engagement with the first or second gear engaged with one clutch at the same time. , the third clutch is engaged with the gear supported by the balance shaft.
Alternatively, by meshing with the fourth gear, it becomes possible to switch the rotational speed of the stirrer in four stages using a single motor.

``Problems to be Solved by the Invention'' However, in the above-mentioned conventional switching device, the roller of the operating rod, whose other end is connected to the clutch, is pressed against the circumferential surface of the plate cam by spring pressure, The configuration in which the actuating rod is moved in parallel with the clutch change has the problem that it is actually difficult to smoothly move the actuating rod in a parallel state on the support shaft, and reliable switching of the clutch cannot be expected.

Moreover, in the conventional method, two clutches are switched at the same time, which naturally requires accurate timing for simultaneous switching, which not only makes smooth parallel movement of each operating rod even more difficult, but also makes it difficult to move the two clutches simultaneously. Simultaneous switching of multiple clutches results in extremely large shocks during switching, which also poses operational hazards.

Furthermore, moving the operating rod in a predetermined direction based on the peripheral surface shape of the plate cam and the spring pressure not only deteriorates the spring and makes it impossible to obtain a normal pressure contact state of the roller.
It is quite conceivable that the spring itself vibrates when it expands and contracts, and the pressing force is not accurately transmitted to the operating rod, so from these points as well, there is a problem that reliable clutch switching cannot be achieved. There is.

``Means for Solving Problems'' Therefore, the present invention was developed to effectively solve various problems of the conventional switching device described above, and has a clutch pawl on the side opposite to the idle shaft. Each of the first, second, third, and fourth gears is rotatably supported, and a clutch having engaging pawls on both sides is movably supported between the first gear and the second gear. However, assuming a clutch mechanism in which another clutch, which also has engaging pawls on both sides, is movably supported between the third gear and the fourth gear, the engaging pawl of one clutch can be moved independently of the other clutches. A switching device that alternately engages the clutch pawls of the first gear and the second gear, and alternately engages the clutch pawls of the third gear and the fourth gear, independently of the first clutch, and the external A grooved cam is provided which rotates when the handle is operated, a pair of rollers are fitted into the grooves of the cam, and two slidably overlapped slide plates are provided which fix the shafts of each roller, Each of the slide plates forms a long hole and a receiving part that is movably fitted into the other long hole, and the shaft part of the roller is individually fixed to each receiving part, and each roller has a groove shape of the cam. The structure is such that each slide plate can be moved individually as the slide plate moves, and each slide plate is provided with a pin member that interlocks with the slide plate. An operating rod rotatably supported on a shaft is provided, and one end of each operating rod is connected to each pin member of the slide plate.

"Function" Accordingly, in the present invention, when the grooved cam is rotated by operating the handle, the slide plates fixed to each roller move individually due to the action of the grooved cam and the pair of rollers. As a result, the pin member provided on the slide plate is moved in the same direction, and as a result, the operating rod is reliably rotated by the movement of the pin member, and the clutch connected to the operating rod is moved in a predetermined gear direction. Since the engaging pawl of the clutch is alternately engaged with the clutch pawl of the gear, reliable switching between four stages is possible.

``Example'' The present invention will be described in detail below based on an illustrative example.

First, to explain the clutch mechanism, as shown in FIGS. 1 and 2, the clutch mechanism according to this embodiment has an idle shaft 2 rotatably supported in a casing 1 of a mixer, each having a different number of teeth. 1st, 2nd, 4th, and 3rd gears 3, 4, 6, 5
are rotatably supported in order at appropriate intervals, and a clutch 7 having engaging pawls 7a and 7b on both sides is movably supported between the first gear 3 and the second gear 4. , another clutch 8, which also has engagement pawls 8a, 8b on both sides, is movably supported between the third gear 5 and the fourth gear 6, and the engagement of the first clutch 7 is controlled via a switching device to be described later. The pawls 7a, 7b are alternately engaged with the respective clutch pawls 3a, 4a of the first gear 3 and third gear 4, regardless of the other clutches 8, and the engaging pawls 8a, 8b of the other clutches 8 are similarly engaged with the clutch pawls 3a, 4a of the third gear 4. 7, the clutch claws 5a and 6a of the third gear 5 and the fourth gear 6 are engaged with each other alternately.

Further, an input shaft 9 is provided in the casing 1 in a state parallel to the idle shaft 2, and fifth to eighth gears 10 mesh with the first to fourth gears 3, 4, 5, and 6 on the input shaft 9. , 11, 12, and 13, respectively, and the fifth gear 10 is connected to the first gear 3 and the sixth gear 11.
is the second gear 4, the seventh gear 12 is the third gear 5,
The eighth gear 13 is engaged with the fourth gear 6, and the driving force of a single motor (not shown) separately provided in the casing 1 is transmitted through the gears 10, 11, 12, and 13. for each gear 3 on the idle shaft 2 side,
4, 5, and 6 to rotate the stirrer connected to the idle shaft 2 via a bevel gear or the like at a desired speed.

Next, the switching device of such a clutch mechanism will be explained. The switching device according to this embodiment is also shown in FIG.
As shown in FIG. 2, a grooved cam 15 is provided in place of the conventional plate cam, which is rotated by the operation of an external handle 14, and a pair of rollers 1 are installed in the groove of the cam 15.
6 and 17 are rotatably fitted opposite each other,
The shaft portions 16a, 17a of each of the rollers 16, 17 are individually fixed to two slide plates 18, 19, which will be described later. As shown in FIG. 3, the grooved cam 15 is divided into two parts, one being an action zone X and the other being a neutral zone Y, with the action zone X having a highest shape part A and a lowest shape part B. composition.

The slide plates 18 and 19 are as shown in the figure.
Both slidably overlapped ends are supported by a support arm 20, and elongated holes 18a, 19a are formed at predetermined locations, and receiving portions 18b, 19b are formed to be movably fitted into the other elongated hole. , each receiving portion 18
The shaft portions 16a, 17a of the rollers 16, 17 corresponding to the rollers 16, 19b are fixed, and the respective rollers 16, 1
7 moves in the groove shape of the cam 15, each slide plate 18, 19 can also move individually in the same direction.

Further, one slide plate 18 is provided with a pin member 21, and the other slide plate 19 is formed with another elongated hole 22 into which the pin member 21 is movably inserted. loosely fit into the other slide plate 1 with its end protruding.
An arm 23 having a pin member 24 is formed at 9.

Further, an operating rod 27 has a piece 25 on the other end side that engages in the central annular grooves 7c and 8c of each of the clutches 7 and 8, and whose central portion is rotatably supported on a support shaft 26, 28, one end of each of the operating rods 27, 28 is connected to the pin members 21, 24 through cutouts 27a, 28a, respectively, and the slide plates 18, 19 are moved by the action of the grooved cam 15. Along with,
By interlocking the pin members 21 and 24 in the same direction, each of the operating rods 27 and 28 is rotated in a predetermined direction about the support shaft 26, and the piece 25 at the other end of the operating rods 27 and 28 is engaged. 7 and 8 are moved. As shown in FIG. 4, the clutches 7 and 8 engage not only the pieces 25 of the operating rods 27 and 28 but also the pieces 30 of the auxiliary rod 29 which are rotatably supported on the support shaft 26. shall be installed to ensure smooth movement and rotation.

Therefore, when switching the clutch mechanism using a switching device with such a configuration, first the switch shown in FIG.
When the grooved cam 15 is rotated by operating the handle 14 to the state shown in FIG.
The slide plate 18 is moved to the left in the figure through the slide plate 18, and the pin member 21 provided on the slide plate 18 is moved in the same direction via the elongated hole 22, so the pin member 21 is activated. The rod 28 rotates counterclockwise in the figure.

As a result, the clutch 7 moves in the direction of the first gear 3, particularly by the piece 25 of the operating rod 28, and engages its own engaging pawl 7a with the clutch pawl 3a of the first gear 3, so that only the first gear 3 The rotational force is transmitted via the fifth gear 10 to rotate the stirrer at the first stage rotational speed. In this state, since the roller 17 is located in the neutral zone Y of the grooved cam 15, the other clutch 8 is also in a neutral state, and
The second to fourth gears 4, 5, and 6 are the sixth to eighth gears, respectively.
It is engaged with gears 11, 12, and 13, but it is simply spinning idle.

From this state, by further operating the handle, the groove cam 15
When the roller 16 is rotated by 1/4 to the state shown in FIG. This action causes the operating rod 28 to rotate clockwise in the figure.

As a result, the clutch 7 now moves in the direction of the second gear 4 and engages its own engaging pawl 7b with the clutch pawl 4a of the second gear 4, so that only the second gear 4 is moved through the sixth gear 11. rotational force is transmitted,
The stirrer is rotated at the second stage rotation speed. Note that even in this second stage, the roller 17
is located in the neutral zone Y of the grooved cam 15, so not only is the other clutch 8 in a neutral state, but the other gears are also in a idling state, as in the first stage. .

Next, by operating the handle 14, the grooved cam 15 is further rotated by 1/4 as shown in FIG. The slide plate 19 is moved to the right in the figure via the portion 17a, and the pin member 24 provided on the slide plate 19 via the arm 23 is moved in the same direction.
4, the operating rod 27 rotates clockwise in the figure.

As a result, the clutch 8 moves in the direction of the third gear 5, and the clutch 8 moves its pawl 8a to the clutch pawl 5 of the third gear 5.
Since the third gear 5 is engaged only with the third gear 5 through the seventh gear 12, the stirring bar is rotated at the third rotational speed. still,
In such a state, contrary to the above, the roller 16 is located in the neutral zone Y of the grooved cam 15, so one clutch 7 is also in a neutral state, and the other gears are not idling. Being in a state is similar.

From this state, by further operating the handle, the groove cam 15
When rotated by 1/4 to the state shown in FIG. 2D, the roller 17 comes into contact with the lowest shaped portion B of the grooved cam 15, and the slide plate 19 is moved to the left in the figure.
The action of the pin member 24 causes the operating rod 27 to rotate counterclockwise in the figure.

As a result, the clutch 8 moves in the direction of the fourth gear 6 and engages its own engaging pawl 8b with the clutch pawl 6a of the fourth gear 6, so that only the fourth gear 6 rotates via the eighth gear 13. The force is transmitted to rotate the stirrer at the fourth stage rotational speed.
Even in this fourth stage, since the roller 16 is located in the neutral zone Y of the grooved cam 15, one clutch 7 is also in a neutral state, and the other gears are in a idling state. The same thing is true.

Therefore, in this embodiment, switching from the first stage to the fourth stage can be easily performed by simply rotating the grooved cam 15 once by operating the handle 14. For this reason, the switching device for each stage can be
4 is clearly displayed on the first surface of the casing, the handle operation at the time of switching becomes easier.

"Effects of the Invention" As described above, the present invention provides a grooved cam that rotates by operating an external handle, a pair of rollers fitted into the grooves of the cam, and a sliding mechanism that fixes the shaft of each roller. two superimposed slide plates are provided, each slide plate forming an elongated hole and a receiving portion movably fitted into the other elongated hole, and a shaft portion of the roller is inserted into each receiving portion. Each roller is fixed individually, and as each roller moves in the groove shape of the cam, each slide plate is also movable individually. Furthermore, each slide plate is provided with a pin member that interlocks with the slide plate, and the other end side is An operating rod is provided which is connected to each clutch and whose center portion is rotatably supported on a support shaft, and one end side of each of the operating rods is connected to each pin member of the slide plate. As a result, reliable rotational movement of the operating rod for switching the clutch can be achieved, making it possible to eliminate the problems of conventional switching devices.

Moreover, the present invention does not switch two clutches at the same time as in the past, but instead switches one clutch independently of the other, making it easy to time the switching and reducing shock when switching. It becomes possible to relax.

Furthermore, since there is no need to use a spring that presses the rollers as in the past, problems associated with the use of springs can be solved, and reliable switching is further facilitated.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the main parts showing the switching device and clutch mechanism according to the present invention in a state where they are switched to the third stage;
Figure 2A is a front view showing the first stage switching state, Figure 2B is a front view showing the second stage switching state, Figure C
is a front view showing the switching state of the third stage, FIG. 3 is a front view showing the switching state of the fourth stage, and FIG. FIG. 4 is a side view of essential parts showing the relationship between the clutch, the operating rod, and the auxiliary rod. 2... Idle shaft, 3... First gear, 4... Second gear, 5... Third gear, 6... Fourth gear, 3
a, 4a, 5a, 6a...clutch pawl, 7, 8...
...Clutch, 7a, 7b, 8a, 8b... Articulating pawl, 14... Handle, 15... Groove cam, 16,
17...Roller, 18, 19...Slide plate, 1
8a, 19a...long hole, 18b, 19b...receiving part, 21, 24...pin member, 27, 28...operating rod.

Claims (1)

[Scope of utility model registration request] First, second, third, and fourth gears each having a clutch pawl shaft on the side opposite to the idle shaft are rotatably supported, and interlocking pawls are provided on both sides between the first gear and the second gear. In the clutch mechanism, one clutch is movably supported between the third gear and the fourth gear, and another clutch having engagement pawls on both sides is movably supported between the third gear and the fourth gear. The engaging claws of the other clutches are made to alternately engage the clutch claws of the first gear and the second gear, and the engaging claws of the other clutches are made to engage the clutch claws of the third gear and the fourth gear independently of the first clutch. A switching device for alternately interlocking, provided with a grooved cam that rotates by operating an external handle, and a pair of rollers fitted in the groove of the cam,
Further, two slide plates are provided which are slidably overlapped to fix the shaft portion of each roller, and each slide plate forms an elongated hole and a receiving portion that is movably fitted into the other elongated hole. , the shaft portions of the rollers are individually fixed to each of the receiving portions, and as each roller moves in the groove shape of the cam, each slide plate is also movable individually; A pin member is provided which interlocks with the above-mentioned clutch, and an operating rod whose other end is connected to each of the clutches and whose center portion is rotatably supported on a support shaft is provided, and one end of each of the operating rods is connected to the above-mentioned clutch. 1. A clutch switching device characterized in that it is configured to be connected to each pin member of a plate.