JPH081801Y2 - Manual pulse generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION “Industrial application field” The present invention relates to a manual pulse generator for moving and positioning a work or the like of a machine tool.

"Prior Art" Generally, in a machine tool such as a machining center, as shown in FIGS. 3 and 4, a manual pulse generator for moving and positioning a tool or a work is used. The manual pulse generator supplies a pulse signal from a sensor unit 1 including a light emitting device and a light receiving device according to a rotation angle of a rotary disc having a slit to another circuit device via a connector 2. Has become. The rotating shaft 3 for rotating the rotating disk is rotatably supported by the main body 4 with bearings 5 and 6 interposed. On the other side of the rotating shaft 3, a dial 7 having a scale for displaying a rotation angle is fixedly provided, and a handle 8 for an operator to hold is rotatably attached to the dial 7. It is supported. Then, when the handle 8 is gripped and the dial 7 is turned by a predetermined angle, a pulse signal corresponding to the angle is output from the sensor unit 1. The handle 8 is provided with a certain amount of frictional resistance, so-called friction, so that the handle 8 does not rotate carelessly even if it is not operated and the rotation angle is easily set. In order to provide such a friction, the drum 9 is fixed to the rotary shaft 3, and the leaf spring 10 is fixed to the main body 4 with screws.
The steel ball 11 is brought into pressure contact with the drum 9 by utilizing the elastic force of.

In addition, the mechanism shown in FIG. 5 is also used. The friction mechanism shown in FIG. 5 has a release spring between the holder 12 screwed to the main body 4 and the dial 7.
When the dial 7 rotates with the interposition of 13, the dial 7 is brought into sliding contact with the release spring 13 to have some friction.

However, the former friction mechanism is the leaf spring 10
Due to the fact that the friction force is given by the elastic force of, the adjustment of the degree of friction is not easy, for example, in order to adjust the degree of friction, it is necessary to replace it with a leaf spring 10 having an elastic force corresponding to it. Further, it is necessary to secure a space for mounting the drum 9 and the leaf spring 10 for giving a friction, and further for mounting the steel ball 11, which causes a problem that the shape is correspondingly bulky.

The latter friction mechanism adjusts the pressing force of the dial 7 against the release spring 13 to set the degree of friction to a desired value, but there is a fluctuation such as a reduction in the degree of friction due to wear of the sliding contact portion. This is a factor, and since the tightening force of the screw 14 is used to adjust the pressing force of the dial 7, it is not easy to make fine adjustments, and it is not satisfactory to obtain the desired friction.

Therefore, in view of the above circumstances, the present invention can provide an appropriate friction to the rotating shaft for rotating the pulse generating section without increasing the number of parts and increasing the size, and the degree of friction can be freely adjusted. It is an object of the present invention to provide a convenient manual pulse generator that can be finely and finely adjusted and is very useful in use.

"Means and Actions for Solving the Problem" The present invention has been made to achieve the above-mentioned object, and a rotating disk provided with a large number of slits, and a pulse is provided by shielding and transmitting light by the slits of the rotating disk. A manual pulse generator having a pulse generator for outputting a signal, wherein an operating knob is fixedly mounted on a rotary shaft of the rotary disc, wherein an inner race of a bearing supporting the rotary shaft is outer race. The bearing itself is provided with a desired value of friction by appropriately pressing and loosening the nut in a direction in which the bearing is positioned.

[Embodiment] An embodiment of the manual pulse generator according to the present invention will be described below with reference to the drawings.

First, the first embodiment shown in FIG. 1 will be described. In the first embodiment, a microminiature type which is attached to an operation panel, or which can be appropriately pulled out from the operation panel and operated by an operator's hand In the figure, 21 is the main body. At the center of the main body 21, there is a receiving hole 22 penetrating from one end to the other end. A ball bearing 23, 24 is interposed in the receiving hole 22 to rotatably support a rotary shaft 25. The outer races 23a, 24a of the ball bearings 23, 24 are fitted in the recessed portions 22a, 22b of the receiving hole 22, respectively. Inner race of one ball bearing 23
One side of 23b can be pressed by a nut 26 screwed to the rotary shaft 25. The nut 26 is adapted to be screwed with a male screw 25a formed on a part of the rotary shaft 25 protruding from one opening of the receiving hole 22. An end portion of the outer race 23a of the ball bearing 23 at a position opposite to the nut 26 is brought into contact with a wall portion of the recess 22a of the main body 21 with an elastic dish washer, a so-called bell screw spring 27 interposed. It is like this. One end of the inner race 24b of the ball bearing 24 is brought into contact with the end of the large diameter portion 25b of the rotary shaft 25. The large-diameter portion 25b of the rotating shaft 25 is projected from the other side of the receiving hole 22, and a rotating disk 29 having a slit that constitutes a part of the pulse generating portion 28 is fixedly provided. A light receiving and emitting portion 30 for outputting a pulse signal according to the rotation angle of the rotating shaft 25 is fixed to one end of the main body 21 by being shielded by the slit of the rotating disk 29. The light emitting / receiving unit 30 constitutes the pulse generating unit 28 together with the rotating disc 29, and is composed of a light receiving device and a light emitting device, and the light receiving device and the light emitting device are provided with the rotating disk 29 provided with the slit. Of course, they are sandwiched and faced to each other. The pulse generator 28 is covered with a case 31, and the pulse generator
The lead wire is pulled out from 28 as before. Case
31 is fixed to the main body 21. Pulse generator of rotating shaft 25
A dial 32 is fixed to the end opposite to 28 with a screw 33. The dial 32 is provided with a scale for displaying the rotation angle, and the rotation angle of the dial 32, and by extension, the rotation disc 29 can be read with respect to the index line attached to the main body 21. A knob 34 is rotatably supported on the dial 32 as in the conventional case.

That is, when the operator holds the dial 34 and turns the dial 32 by a desired angle, the rotary shaft 25 and the rotary disc 29 rotate, and a pulse signal is generated from the light emitting / receiving unit 30 according to the rotation angle. At this time, if it is assumed that the rotary shaft 25 can rotate without any resistance (friction resistance), it is easy to rotate it so as to align it at a predetermined rotation angle while looking at the scale of the dial 32 with respect to the index line of the main body 21. Often, it goes too far or the rotational position is insufficient, so that the rotary shaft 25 has an appropriate friction. To give the rotating shaft 25 friction, the nut 26 is tightened. When the nut 26 is tightened, the inner race 23b of the ball bearing 23 is pressed in the axial direction of the rotating shaft 25, that is, in the direction of being displaced relative to the outer race 23b, and the steel ball of the ball bearing 23 is pressed. The outer race 23a and the inner race 23b are squeezed by 23c according to the pressing force of the inner race 23b, and impart a frictional resistance to the rotation of the steel ball 23c. The rotation resistance of the steel ball 23c becomes the rotation resistance of the rotating shaft 25. Therefore, when the operator holds the claw 34 with his / her finger to rotate the dial 32, the dial 32 is rotated against the rotation resistance, so that the operator does not overshoot and can easily perform the alignment with respect to the desired rotation angle. To adjust the degree of friction of the rotary shaft 25, the pressing force of the inner race 23b of the bearing 23 by the nut 26 can be adjusted to finely adjust the rotation resistance of the steel ball 23c by the outer race 23a and the inner race 23b. obtain. At this time, the bell bis spring 27 is designed to have an elastic force when the steel ball 23a is pinched by the outer race 23a and the inner race 23b. Inner race 23b
Can move a little in the axial direction of the rotary shaft 25 when adjusting the friction, and can rotate together with the rotary shaft 25. On the other hand, the outer race 23b moves with respect to the main body 21 when adjusting the friction and presses the bell screw spring 27 to utilize the repulsive force. Is in a state.

FIG. 2 shows a manual pulse generator used in a tabletop model. The main body 21 has a long body, and the rotary shaft 25 has a dial 32 and a steering wheel type handle 35 fixed thereto. This is the same as the first embodiment. That is, the inner race 23b of one ball bearing 23 that rotatably supports the rotary shaft 25 with respect to the main body 21 is pressed by the nut 26 screwed to the rotary shaft 25, and the same as in the first embodiment. In addition, the outer race 23a and the inner race 23b clamp the steel ball 23c to impart rotational resistance to the steel ball 23c so that the ball bearing 23 has an appropriate friction. The degree of friction can be freely obtained by adjusting the pressing force of the nut 26 on the inner race 23b. Further, it is also the same as the first embodiment that a bell screw spring 27 is interposed between the outer race 23a and the main body 21 to give an elastic force when the friction is applied. Others are the same as those in the first embodiment.

[Advantage of Invention] As described above, according to the manual pulse generator of the present invention, an appropriate friction is applied to the rotary shaft for rotating the pulse generator without increasing the number of parts and increasing the size. Moreover, the degree of friction can be adjusted freely and finely, which is convenient for use.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of a manual pulse generator according to the present invention, FIG. 2 is a vertical sectional view of a manual pulse generator showing a second embodiment, and FIG. 3 is a conventional manual pulse generator. FIG. 4 is a vertical cross-sectional view of the generator, FIG. 4 is a main part configuration diagram of the manual pulse generator of FIG. 3, and FIG. 5 is a vertical cross-sectional view of another conventional manual pulse generator. 21 …… Main body 23, 24 …… Ball bearing 25 …… Rotary shaft, 26 …… Nut 28 …… Pulse generator, 32 …… Dial

Claims (1)

[Scope of utility model registration request] 1. A rotary disk having a large number of slits, and a pulse generating section for outputting a pulse signal by light shielding and light transmission by the slits of the rotary disk, and operating on a rotary shaft of the rotary disk. Manual pulse generator in which a knob for use is fixed, wherein a nut is screwed onto the rotary shaft so that the inner race of the bearing supporting the rotary shaft can be pressed freely. .