JPS6016354A - Regulating wheel slide for centerless grinder - Google Patents

Abstract

PURPOSE:To surely transmit torque even if the reaction force to the torque is reversed at the low speed of rotation, by providing a transmission mechanism on the regulating wheel shaft of a regulating wheel slide to control the rotation of the shaft, and enabling the change in the speed of a regulating wheel through the switchover of the direction of rotation of a motor. CONSTITUTION:The slow rotation of a regulating wheel 5 in the grinding of a workpiece W results in moving a stopper shaft 26 to a position where the shaft is engaged with an engage-stopping portion 29 by the elastic force of a spring 27. An input shaft 14 is rotated forward by a drive motor so that a planet gear 17 is revolved while rotating counterclockwise because a rotary member 21 is kept by a one-way clutch 23 from being turned clockwise and is kept by the stopper shaft 26 from being turned counterclockwise. As a result, a slow forward rotation under high torque is transmitted to a regulating wheel shaft through an output arm 18. When the input shaft 14 is rotated backward, the rotary member 21 is turned together with the input shaft through a one-way clutch 24 so that the rotation of the input shaft is transmitted directly to the regulating wheel shaft through the output arm 18. At that time, the transmitted rotation is a rapid backward one under low torque.

Description

[Detailed Description of the Invention] Technical Field> The present invention is a centerless processing method in which a workpiece placed on a support blade is held between a grinding wheel and an adjusting wheel, and the workpiece is ground and rotated by the adjusting wheel. This relates to an adjustment chassis for a grinding machine.

<Prior art> The adjustment wheel in the adjustment chassis needs to be rotated 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 reshaping device, it is necessary to reduce the reshaping time. It is preferable to rotate at a high speed of 11,000 rpm or more. However, in the past, some models were unable to rotate at high speed 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. (・Ta)

By the way, using a single drive motor and using a planetary gear mechanism and one-way clutch to switch between high and low speeds has been done in the technical field of nut runner equalization.
The structure as it is cannot be used as an adjustment wheel drive mechanism for a centerless grinder due to the following functional differences.

(1) Before the grindstone and workpiece come into contact, the rotation of the adjustment wheel drives the workpiece, whereas 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, in the state before the grindstone and the workpiece come into contact and in the state after the contact, the direction of the reaction force applied to the rotation transmission system of the adjustment wheel is in the opposite direction.

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

From the points (4) and (2) above, in order to use a planetary gear mechanism as a transmission mechanism for the adjustment wheel, low-speed rotation must not be transmitted even if the reaction force received by the planetary gear mechanism is reversed during low-speed rotation. It will not happen.

<Objective of the Invention> Therefore, the object of the present invention is to provide a system that allows switching between high and low speeds of the adjusting wheel by switching between forward and reverse directions of one motor, and also ensures 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 a stopper mechanism is provided that restrains the rotation of the rotating body even if the reaction force applied to the rotating body of the planetary gear mechanism is reversed at low speeds, and the centerless grinding machine The adjustment wheel base meshes a planetary gear with an input shaft rotatably driven by a drive motor or a gear formed integrally with the input shaft, and connects the planetary gear with an adjustment axle,
A one-way clutch is provided with a rotating body formed with internal teeth that mesh with the planetary gear so as to be rotatable around the input shaft, and between the input shaft and the rotating body, transmits rotation to the rotating body when the input shaft is reversed. A stopper is provided to restrict the rotation of the rotating body when the input shaft rotates in the normal direction.

<Example> Embodiments of the present invention will be described below based on the drawings.

In Figures 1 and 2, 1 is the base, 2 is the base I
The adjusting wheel main body 3 fixedly installed on the top is a housing integrated with the adjusting wheel main body 2, and an adjusting axle 4 is rotatably supported by the adjusting wheel main body 2 and the housing 3. 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. Reference numeral 11 denotes a correction device for reshaping the adjustment wheel 5 installed on the adjustment wheel main body 2, and includes a correction tool #12. When correcting the adjusting wheel 5 using the correcting device 11, the adjusting wheel 5 rotates at a 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 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. Further, a spline 15 is provided at the inner end of the input shaft 140, and a spur gear 16 is fitted into and engaged with the spline 15.
mesh. 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 connects the planetary gear 17 to the output arm 1.
8 is fixedly installed, and the tooth profile 18α at the tip of the output arm 18 is engaged with a spline on an intermediate shaft 19 integral with the adjustment axle 4. 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. Furthermore, a rotating body 21 is provided which is rotatably supported around the input shaft 140. This rotating body 21 has the planetary gear 17
is formed with a meshing 5 inner circumferential tooth n, and a locking portion 29 (see Figs. 4 and 5
(see figure).

A first one-way clutch device is interposed between the outer periphery of the rotary body 21 and the adjustment wheel body 2 to prevent clockwise rotation of the rotary body 210. A second one-way latch is interposed between them to transmit rotation to the rotary body 21 when the input shaft 14 rotates in reverse (counterclockwise).

Further, the adjustment wheel body 2 is provided with a stopper 5. This stopper 5 restrains the rotating body 21 from rotating counterclockwise only when the input shaft 14 rotates normally (clockwise). It has a stopper shaft 26 that is pressed in the direction of engagement with the stopper shaft 26.

When the input shaft 14 is reversed in reverse, the stopper shaft 26 is supplied with pressure by switching the switching valve and retreats against the spring H due to fluid pressure, thereby releasing the rotational restraint of the rotating body 210.

Since the present invention has the above-mentioned configuration, the low-speed rotation of the adjusting wheel 5 during grinding of the workpiece W is caused by the elastic force of the spring n, which causes the stopper shaft 26 to rotate at the locking portion 4, as shown in FIG. advance to the position where it engages. Further, the input shaft 14 is rotated in the normal direction by the drive motor 8. Due to the forward rotation of the input shaft 14, the planetary gear 17 causes the rotating body 21 to be prevented from rotating clockwise by the first one-way latch n, and from rotating one rotation counterclockwise by the stopper shaft 26. Therefore, it revolves around the input shaft 14 while rotating counterclockwise, and the output arm 1
8, the low speed, high torque positive rotation is transmitted to the adjustment axle 4.

On the other hand, when the adjustment device performs high-speed rotation to reshape the adjustment wheel 5, the stopper shaft portion is moved backward to allow the rotating body 21 to rotate counterclockwise, as shown in FIG. Then, the drive motor 8 rotates the input shaft 14 in the reverse direction. This input shaft 14
Due to the reversal of , the rotating body 21 rotates integrally with the input shaft 14 via the second one-way latch, and the deceleration effect of the planetary gear 17 is removed, so that the input shaft 140 rotates directly via the output arm 18. The torque is then transmitted to the adjustment axle 4, resulting in high and low torque rotation (reverse rotation).

As another embodiment, a concave groove 3o may be formed on the outer periphery of the rotary body 21 as shown in FIG. 6 so that the forward and reverse rotation of the rotary body 21 can be restrained only by the stopper 5.

<Effects> As described above, according to the present invention, the speed change mechanism with the planetary gear structure is disposed coaxially with the adjustment axle to control the rotation of the adjustment axle, so it can be compactly incorporated into the adjustment axle. It has remarkable effects such as being able to perform a number of functions and having a simple configuration.

[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 cross-sectional view of the main part, Fig. 4 is a low l base during grinding, 2
...Adjustment wheel body, 3.Housing, 411.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, B...11 first one-way clutch, Sae...fist second one-way clutch, 5...stopper, 4... Locking part. Figure 4 Figure 5 14 22

Claims (1)

[Claims] A planetary gear meshes with an input shaft rotationally driven by a drive motor or a gear formed integrally with the input shaft, and the planetary gear and an adjustment axle are connected to form internal teeth that mesh with the planetary gear. The rotating body is provided rotatably around the input shaft, and a one-way clutch is interposed between the input shaft and the rotating body to transmit rotation to the rotating body when the input shaft is reversed,
An adjustment chassis for a centerless grinding machine, characterized in that it is equipped with a stopper for restraining the rotation of the rotating body when the input shaft rotates in the normal direction.