JPS6110912Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a disk device for indexing control used for controlling turret rotation of an NC lathe and other purposes.

Conventionally, this type of disk has been constructed by dividing the disk body into equiangular sectors and forming transparent parts in each fan-shaped section according to the index number, and the disk is interlocked with the drive of a hydraulic motor. The turret is fixed to the shaft of a turret that rotates at a predetermined angle, and a photo sensor installed close to the disc reads information on the disc to determine the current indexing position and calculate the next index from the current indexing position. When rotating the turret to a position, when the turret is near the next indexed position, a timer is activated to slow down the rotation of the turret for a set time so that the turret stops exactly at the next indexed position. ing.

However, with this conventional device, the deceleration time is set by a timer, so when the load fluctuates, for example, when the load is heavy, the rotation slows down and the turret stops before the specified position, or when the load is light, the rotation speed increases and the turret stops after passing the specified position, making it difficult to stop at the specified position accurately. Therefore, in order to reduce the fluctuation in rotation speed caused by the load fluctuation, it is necessary to considerably increase the power of the turret's rotation drive source so that the load fluctuation does not affect the rotation speed.
In this case, a drive source with a considerably large power must be prepared, which has the drawback of making the entire device expensive and large in size.

The purpose of the present invention is to provide an indexing control disk device that eliminates these drawbacks, and is characterized by having an intermediate slit-shaped transparent portion in the remainder of the fan-shaped portion and a predetermined slit-shaped transparent portion on both sides thereof. One auxiliary detection sensor is provided at a position opposite to the remaining portion on the front surface side of the disc on which the light blocking portion of the width is formed, for detecting light passing through the light transmitting portion of the remaining portion or light blocking by the light blocking portion.

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 designates a disc main body, which is formed from a transparent synthetic resin plate, and its surface is divided into 12 fan-shaped parts 1a having equal central angles as shown in the first figure.
In each of these fan-shaped portions 1a, a transparent portion 2a and a light blocking portion 2b are arranged so that a binary number corresponding to the index number can be obtained.
Up to this point, there is no particular difference from the conventional one, but according to the present invention, in the remainder of each fan-shaped portion 1a, that is, the outermost peripheral portion 1b, there is a slit-shaped transparent portion 3a on the center line and an equal width on both sides thereof. The light shielding part 3b,
It is characterized by the formation of 3b.

Next, a case where the disk is applied to turret rotation control of an NC lathe will be explained with reference to FIG. In the figure, 4 is a turret, 4a is its shaft, and 5 is a clamp cylinder box provided in the middle of the shaft 4a.The box 5 has a built-in clamp cylinder, and the piston is moved when the cylinder 5a is driven. In conjunction with the reciprocating movement of the rod, the hearth gear 6
A was clamped or unclamped. 7 is a large diameter gear fixed to the tip of the shaft 4a, 8 is a hydraulic motor, and a small gear 9 fixed to the rotating shaft of the motor 8 is meshed with the large diameter gear 7 to drive the rotation of the motor 8. The turret 4 was made to rotate. Here, the axis of the disk body 1 is set to the axis 4a, and the index number on the disk is set to the turret 4.
The numbers were tied to match. A light source 10 is provided on the back side of the disc body 1, and a main detection sensor 11 consisting of four phototransistors that detects the index number is installed on the front side, and a main detection sensor 11 that detects light passing through or blocking of the outermost part of the disc body 1. Auxiliary detection sensor 12 consisting of one phototransistor
has been established.

13 is a comparison circuit, 14 is a gate circuit, 15 and 16 are electro-hydraulic converters, and the comparison circuit 13
is the binary signal of the current index position number of the turret 1 from the main detection sensor 11 and the setting device 1.
7 and a binary signal of the next set index number are input, and an output signal is generated depending on whether these two numbers are equal or not. Further, the gate circuit 14 receives an input signal from the comparator circuit 13, and when the two binary signals are not equal, unclamps the clamp cylinder via an electro-hydraulic converter 15, and also unclamps the clamp cylinder via an electro-hydraulic converter 15. When the two binary signals become equal, the sensor 12 receives a signal from the auxiliary detection sensor 12, and the sensor 12 detects the light shielding part 3 of the outermost peripheral part 1b of the disc body 1.
When the light is blocked by b, a deceleration signal is outputted to decelerate the hydraulic motor 8 via the electro-hydraulic converter 16, and the sensor 12 then connects to the slit-shaped transparent portion 3.
When light is received from a, the hydraulic motor 8 is stopped and the clamp cylinder is placed in a clamped state.

Thus, if the current index number of the turret 4 is, for example, number 3, and the next index number is set to number 6 in the setting device 17, the clamp cylinder is unclamped and the hydraulic motor 8 is rotationally driven to rotate the turret. Rotate 4. When the current index number becomes 6 due to this rotation, the gate circuit 14
receives an input signal from the auxiliary detection sensor 12, and while the sensor 12 is shielded from light by the light shielding part 3b of the disc body 1, a deceleration signal is generated from the gate circuit 14 to decelerate the hydraulic motor 8 and operate the turret. 4, and sensor 12.
When it receives the light transmitted through the transparent part 3a of the disk body 1, a stop signal is generated from the gate circuit 14 to stop the hydraulic motor 8, and at the same time, the clamp cylinder is put into a clamped state to clamp the turret shaft 4a and stop the turret 4. do. Therefore, the turret 4 is reliably stopped at a predetermined position.

As described above, according to the present invention, in each fan-shaped part of the disc body, the remaining part other than the area where the transparent part and the light-blocking part are formed according to the index number, the intermediate slit-shaped transparent part and the predetermined width on both sides thereof are added. For example, when the turret rotates and approaches a predetermined indexing position and the auxiliary detection sensor is blocked by the light shielding part and does not receive light, the rotation of the turret is decelerated and the slit-shaped transparent part is formed. Since the rotation of the turret can be stopped when receiving transmitted light, a single auxiliary detection sensor can generate a deceleration signal and a stop signal, ensuring that the turret always stops at the specified position even if the load fluctuates. In addition, since the light-shielding portions of the predetermined width are formed on both sides of the light-transmitting portion, it is possible to generate a deceleration signal and a stop signal from the sensor in either the forward or reverse direction of the disk, which further improves the conventional method. Since it is only necessary to form the light-shielding part and the light-transmitting part in the remaining part of the disc, the structure is simple and inexpensive, and the device as a whole is compact and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a front view of one example of the disk of the present invention, and FIG. 2 is a schematic explanatory diagram of the case where this is applied to rotation control of an NC lathe. 1... Disc body, 1a... Fan-shaped part, 1b...
Remaining part, 2a...transparent part, 2b...shading part, 3a...
...Slit-shaped light-transmitting portion, 3b, 3b...light-shielding portion.

Claims (1)

[Scope of utility model registration request] The disk main body is divided into fan shapes of equal angles, and a disk in which a transparent part and a light blocking part are formed according to the index number is fixed to the shaft, and a light source is provided on the back side of the disk, and the partition is divided on the front side. In the device provided with a main detection sensor for detecting a serial number, an intermediate slit-shaped transparent part and a light-shielding part of a predetermined width are formed on both sides of the intermediate slit-shaped transparent part in the remaining part of each fan-shaped part, and the remaining part on the front side of the disk is formed with a light-shielding part of a predetermined width. An indexing control disk device characterized in that one auxiliary detection sensor is provided at an opposing position to detect light passing through the remaining light transmitting section or light blocking at the light shielding section.