JPH0347984B2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention involves processing by holding a workpiece placed on a support blade between a grinding wheel and an adjustment wheel, and grinding and rotating the workpiece by the adjustment wheel. This invention relates to an adjustment chassis for a centerless grinding machine.

<Prior art> The adjustment wheel in the adjustment chassis needs to rotate at a low speed of 5 to 200 rpm and high torque during grinding of a workpiece, and when the adjustment wheel is reshaped by a correction device, the correction time is shortened. Therefore, it is preferable to rotate at a high speed of 1000 rpm or more. However, in the past, some machines were unable to rotate at high speeds during correction, while others were equipped with a special motor for high-speed rotation, but these required two drive sources and a switching mechanism, resulting in a complicated configuration. It was inviting a transformation.

By the way, using a single drive motor and a planetary gear mechanism and a clutch to switch between high and low speeds has been done in other technical fields such as nut runners, but it is used as an adjustment wheel drive mechanism for centerless grinding machines. cannot be applied as is due to the following functional differences.

(1) Before the grindstone and workpiece come into contact, the workpiece is driven by the rotation of the adjustment wheel, but when the grindstone is in contact with the workpiece, the workpiece tries to rotate faster than the adjustment wheel. The speed must be kept from exceeding the speed of the regulating vehicle. Therefore, the direction of the reaction force applied to the rotation transmission system of the adjustment wheel is opposite between the state before the grindstone and the workpiece come into contact and the state after the contact.

(2) The workpiece must be reliably rotated by the adjustment wheel before the grindstone comes into contact with the workpiece.

Based on these points (1) and (2), in order to use a planetary gear mechanism as a transmission mechanism for the adjustment wheel, it is necessary that low-speed rotation is not transmitted even if the reaction force received by the planetary gear mechanism is reversed during low-speed rotation. It will not happen.

<Object of the Invention> Therefore, the object of the present invention is to provide a system that can switch the speed of the adjusting wheel between high and low speeds by switching between forward and reverse directions of a single motor, and also provides reliable low-speed rotation transmission even when the rotational reaction force is reversed at low speeds. It is about achieving.

<Configuration of the Invention> The characteristic configuration of the present invention is that an input shaft and an adjustment axle are rotatably supported on the adjustment wheel body coaxially and facing each other, and a rotating body is provided on the outer periphery where the input shaft and adjustment axle face each other. is rotatably supported on the adjustment wheel body coaxially with the input shaft, a drive motor for rotating the input shaft in the forward or reverse direction is rotationally connected to one end of the input shaft, and a spur gear is rotationally connected to the other end of the input shaft. An arm rotatably bearing a planetary gear that meshes with this spur gear is rotatably connected to the adjustment axle, and when the input shaft rotates in the normal direction, relative rotation between the input shaft and the rotating body is allowed, and when the input shaft rotates in the reverse direction. During rotation, a one-way clutch that transmits the rotation of the input shaft to the rotating body is interposed between the input shaft and the rotating body, internal teeth are formed on the inner periphery of the rotating body to mesh with the planetary gear, and a one-way clutch is formed on the outer periphery of the rotating body. forming a locking portion that engages in the rotational direction;
A stopper shaft that engages with this locking portion is provided, and the stopper shaft moves to a position where it engages with the locking portion when the input shaft rotates in the normal direction, but does not engage with the locking portion when the input shaft rotates in the reverse direction. A switching drive means is provided for moving the stopper shaft to the position.

<Examples> Examples of the present invention will be described below based on the drawings.
1 and 2, 1 is a base, 2 is an adjustment wheel body fixed on the base 1, 3 is a housing integrated with the adjustment wheel body 2, and an adjustment axle 4 is connected to the adjustment wheel body 2 and the housing. 3 is rotatably supported. Reference numeral 5 denotes an adjustment wheel provided on the adjustment axle 4, which holds the workpiece W placed on the support blade 6 between it and the grinding wheel 10, and applies low-speed grinding rotation to the workpiece W. 11 is a correction device for reshaping the adjustment wheel 5 installed on the adjustment wheel main body 2;
It has a correction tool 12. This correction device 11
When adjusting the adjustment wheel 5 at , the adjustment wheel 5 rotates at high speed.

A speed change mechanism 7 is provided for switching the adjustment wheel 5 between low speed and high speed rotation, and the rotation of the drive motor 8 is input to the speed change mechanism 7 via a timing belt 9.

The configuration of this transmission mechanism section 7 will be explained with reference to FIG. An input shaft 14 is rotatably supported on the adjustment wheel main body 2 on one end of the adjustment axle 4 on a concentric line, and a pulley 13 on which the timing belt 9 is hung is provided at the outer end of the input shaft 14. A spline 15 is provided at the inner end of the input shaft 14, into which a spur gear 16 is fitted and engaged, and a planetary gear 17 is meshed with the spur gear 16. Note that the spur gear 16 may be provided directly on the input shaft 14. Then, the planetary gear 17 and the adjustment axle 4 are connected. This coupling means has an output arm 18 fixed to the planetary gear 17, and a tooth profile 18a at the tip of the output arm 18 is connected to the intermediate shaft 1 integrated with the adjustment axle 4.
9 engages spline 20 on top. Although not shown, it is also possible to extend the end of the adjustment axle 4 and provide a spline at this extended end to engage with the output arm 18, thereby omitting the intermediate shaft 19. A rotating body 21 rotatably supports the input shaft 14 between the adjustment wheel main body 2 and the input shaft 14, and is rotatably supported on the adjustment wheel main body 2 about the same axis as the input shaft 14.
is arranged, and one end of the rotating body 21, that is, the input shaft 14
Inner teeth 22 with which the planetary gear 17 engages are formed at positions where the adjusting axle 4 faces each other, and a locking portion 29 on the outer periphery with which a stopper shaft 26 (described later) engages (see FIGS. 4 and 5). is provided.

A first one-way clutch 23 is interposed between the outer periphery of the rotary body 21 and the adjusting wheel body 2 to prevent clockwise rotation of the rotary body 21. A second one-way clutch 24 is interposed between the two, which transmits rotation to the rotary body 21 when the input shaft 14 rotates in reverse (counterclockwise).

Further, the adjustment wheel main body 2 is provided with a stopper 25. This stopper 25 restrains the rotating body 21 from rotating counterclockwise only when the input shaft 14 rotates normally (clockwise), and is engaged with a locking portion 29 formed on the rotating body 21 by a spring 27. It has a stopper shaft 26 that is pressed in the direction of mating. When the input shaft 14 is reversed, the stopper shaft 26 is supplied with pressure by switching the switching valve 28 and retreats against the spring 27 due to fluid pressure.
The rotation constraint of is now released. By the spring 27 and the switching valve 28, the input shaft 1
4, the stopper shaft 26 is moved to the locking portion 29 during normal rotation.
A switching drive means is configured to move the stopper shaft 26 to a position where it engages with the locking portion 29, and move the stopper shaft 26 to a position where it does not engage with the locking portion 29 when the input shaft 14 rotates in reverse.

Since the present invention is configured as described above, the low speed rotation of the adjustment wheel 5 during grinding of the workpiece W is
As shown in the figure, the stopper shaft 26 is connected to the spring 27.
It is advanced to the position where it engages with the locking part 29 by the elastic force of. Further, the input shaft 14 is rotated in the normal direction by the drive motor 8. Due to the normal rotation of the input shaft 14, the planetary gear 17 causes the rotary body 21 to be prevented from rotating clockwise by the first one-way clutch 23 and prevented from rotating counterclockwise by the stopper shaft 26. Therefore, it revolves around the input shaft 14 while rotating counterclockwise, and transmits low-speed, high-torque positive rotation to the adjustment axle 4 via the output arm 18.

When the rotation of the adjustment axle 4 is faster than that of the input shaft 14, the rotation of the adjustment axle 4 acts on the spur gear 16 via the output arm 18 and the planetary gear 17, so that the input shaft 14 and the drive motor 8 are rotated faster than the input shaft 14. 4, and prevents the rotational speed of the workpiece W from increasing as the grinding wheel 10 rotates.

On the other hand, when the adjusting device rotates at high speed to reshape the adjusting wheel 5, the stopper shaft 26 is moved backward to allow the rotating body 21 to rotate counterclockwise, as shown in FIG. The input shaft 14 is then driven by the drive motor 8.
Reverse. Due to this reverse rotation of the input shaft 14, the rotating body 21 rotates integrally with the input shaft 14 via the second one-way clutch 24, and the deceleration effect of the planetary gear 17 is removed, so that the input signal is transferred via the output arm 18. The rotation of the shaft 14 is directly transmitted to the adjustment axle 4, and the adjustment wheel 5 rotates at high speed with low torque. Due to the resistance applied to the adjustment wheel 5 during reshaping, the rotary body 21 rotates in the opposite direction to the input shaft 14, and the input shaft 14
The rotational speed of the adjustment axle 4 does not decrease compared to the rotational speed of the adjusting axle 4.

In another embodiment, only the stopper 25 is used to
In order to restrict forward and reverse rotation of the rotating body 21, a concave groove 30 may be formed on the outer periphery of the rotating body 21 as shown in FIG.

<Effects> As described above, the present invention rotatably supports an input shaft and an adjustment axle coaxially and facing each other on an adjustment wheel body, and a rotating body is mounted on the outer periphery where the input shaft and adjustment axle face each other. A drive motor is rotatably supported on the adjustment wheel body coaxially with the input shaft, and a drive motor for rotating the input shaft in forward or reverse rotation is rotatably connected to one end of the input shaft, and a spur gear is rotatably connected to the other end of the input shaft, An arm rotatably bearing a planetary gear that meshes with this spur gear is rotatably connected to the adjustment axle, allowing relative rotation between the input shaft and the rotating body when the input shaft rotates in the normal direction, and when the input shaft rotates in the reverse direction. A one-way clutch that transmits the rotation of the input shaft to the rotating body is interposed between the input shaft and the rotating body, internal teeth that mesh with the planetary gear are formed on the inner circumference of the rotating body, and a rotating clutch is formed on the outer circumference of the rotating body. A locking part that engages in the direction is formed, and a stopper shaft that engages with this locking part is provided, and when the input shaft rotates normally, the stopper shaft is moved to a position where it engages with the locking part, and the input shaft The structure is equipped with a switching drive means that moves the stopper shaft to a position where it does not engage with the locking part when the input shaft rotates in the reverse direction. The rotation of the adjustment wheel is transmitted to the input shaft via the arm, planetary gear, and spur gear, and the input shaft and drive motor act as a brake to suppress the increase in the rotation speed of the adjustment wheel, and the rotation of the adjustment wheel is transmitted to the input shaft through the arm, planetary gear, and spur gear. Therefore, the effect of suppressing the increase in the rotational speed of the workpiece W can be obtained. In addition, even if resistance due to reshaping acts on the adjustment wheel when the input shaft rotates in reverse, the input shaft and adjustment wheel rotate as a unit via the one-way clutch, so the rotation relative to the input shaft does not occur. The body will not rotate in the opposite direction and the speed of the adjustment axle will not decrease compared to the speed of the input shaft. In addition, a planetary gear mechanism is used as the reduction mechanism, and the rotation speed of the adjustment axle can be changed with a small amount of action from the stopper shaft, making the device simple and compact. . Further, the control is simple, as it is only necessary to operate the switching drive means and rotate the drive motor in the forward and reverse directions, and the effect of being able to change the torque in accordance with the rotational speed is achieved.

[Brief explanation of drawings]

Fig. 1 is a front view of the present invention, Fig. 2 is a side view, Fig. 3 is an enlarged sectional view of main parts, Fig. 4 is an explanatory diagram showing the low speed rotation state during grinding, Fig. 5 is correction of the adjustment wheel. FIG. 6 is a sectional view showing another embodiment of the rotating body. 1...Base, 2...Adjustment wheel body, 3...Housing, 4...Adjustment axle, 5...Adjustment wheel, 7...
Transmission mechanism section, 8... Drive motor, 11... Correction device, 14... Input shaft, 16... Spur gear, 17...
Planetary gear, 18... Output arm, 21... Rotating body, 22... Inner tooth, 23... First one-way clutch, 24... Second one-way clutch, 25...
Stopper, 29...Locking part.

Claims (1)

[Claims] 1. An input shaft and an adjustment axle are rotatably supported on the adjustment wheel body coaxially and facing each other, and a rotating body is mounted on the adjustment wheel body on the outer periphery where the input shaft and adjustment axle face each other to rotate coaxially with the input shaft. A drive motor that rotates the input shaft forward or backward is rotatably connected to one end of the input shaft, and a spur gear is rotatably connected to the other end of the input shaft, and a planetary gear that meshes with the spur gear can be rotated. An arm supported on a shaft is rotatably connected to the adjustment axle, and when the input shaft rotates in the normal direction, the input shaft and the rotating body are allowed to rotate relative to each other, and when the input shaft rotates in the reverse direction, the rotation of the input shaft is allowed to rotate relative to the rotating body. A one-way clutch for transmission is interposed between the input shaft and the rotating body,
forming internal teeth that mesh with the planetary gear on the inner periphery of the rotating body, forming a locking part that engages in the rotational direction on the outer periphery of the rotating body, and providing a stopper shaft that engages with the locking part; Equipped with a switching drive means that moves the stopper shaft to a position where it engages with the locking part when the input shaft rotates in the normal direction, and moves the stopper shaft to a position where it does not engage with the locking part when the input shaft rotates in the reverse direction. An adjusting chassis for a centerless grinding machine, which is characterized by: