CN201421324Y - Absolute scale - Google Patents

Abstract

The utility model relates to an absolute grating chi of tandem position output, including a confirmation unit of confirming grating chi absolute position, should confirm the unit and concatenate in grating chi to a serial ports interface that supplies grating chi and outside host computer to carry out the communication, concatenate between this serial ports interface and the confirmation unit and provide the control unit that position signal confirmed the position for the confirmation unit through serial ports interface, this control unit has an input port that supplies the outside position signal that triggers, thereby, the utility model discloses grating chi except that position signal transmission at ordinary times can come and go the communication through serial ports interface and host computer outside, does by the outside signal directly by input port input grating chi in, direct requirement latch to reach the effect of latching in time and grating chi encoder synchronization latch.

Description

Absolute scale

technical field

The utility model relates to a grating ruler, in particular to an absolute grating ruler with an external trigger signal input.

Background technique

Press, the grating scale uses the grating of the main scale and the auxiliary scale to produce a superimposed effect for measurement, and the grating scale can be divided into position value output and incremental value output according to the output type.

The grating scale output in the incremental value is output through the A/B phase wave. The advantage is that the host can lock the position in time. The denser the wave, the higher the frequency, so the higher the quality required for the transmission line, it can achieve a considerable amount of signal transmission; another type of position value output grating scale is through serial output, and its advantage is to solve the problem of machine tools and automatic machines. To meet the demand for faster and faster speed, the cable can be simplified and the transmission distance needs to be longer, and the digital serial transmission meets the above requirements, thereby solving the lack of A/B phase wave output.

Please refer to Figure 2, which is a schematic diagram of the serial output grating ruler transmission signal; wherein the grating ruler 90 uses a serial port interface 91 to carry out signal transmission back and forth with an external host 92, and encodes the signal into a serial signal through the host , and then notify the position latch via the control unit 93, but the time point of the output data of the grating ruler 90 is ordered by the host computer 92 in a serial manner, so there is a delay and cannot be positioned in the preset latch position in time, especially in Multi-axis synchronous latch highlights the delay problem.

Utility model content

The present utility model aims at providing an absolute grating ruler for the defects of the above-mentioned prior art, which adds an input port for external triggering on the grating ruler to achieve synchronous positioning at the real position when the signal is triggered.

In order to achieve the above-mentioned purpose, the utility model takes the following technical solutions:

An absolute grating ruler, including a confirmation unit for confirming the absolute position of the grating ruler, the confirmation unit is connected in series to a serial port interface for the grating ruler to communicate with an external host computer, the serial port interface and the confirmation unit are serially connected A control unit is connected to provide a position signal to the confirmation unit to confirm the position through the serial port interface, and the control unit has an input port for externally triggering the position signal.

The confirmation unit includes a detection unit that detects the position signal of the grating ruler. The detection unit is connected in series with a digital signal processor that subdivides the position signal into an absolute position at the rear end, and generates an overall position signal at the rear end through The serial port interface is input to the host computer.

The control unit includes an OR gate, the OR gate has two input ports and an output port that outputs a signal to the confirmation unit, one input port is serially connected to the serial port interface, and the other input port is serially connected to the input port.

The utility model has the advantage that the grating scale can communicate with the host through the serial port interface in addition to the usual position signal transmission, and can also directly input the external signal into the grating scale through the input port to directly require latching, so as to achieve real-time latching and The effect of multi-axis grating encoder synchronous latch.

Description of drawings

Fig. 1 is a schematic diagram of signal transmission of the utility model grating ruler;

Fig. 2 is a schematic diagram of signal transmission of an existing grating ruler.

Explanation of reference numbers:

90. Grating ruler 91. Serial port interface

92. Host 93. Control unit

1. Grating ruler 11. Confirmation unit

111. Detection unit 112. Digital signal processor

12. Serial port interface 13. Control unit

131, input port 132, or gate

132a, input port 132b, output port

2. Host 3. Measuring head

4. Camera

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Please refer to Fig. 1, an absolute grating ruler includes a confirming unit 11 in the grating ruler 1, the confirming unit 11 is used to confirm the absolute position of the optical ruler 1, and it is connected in series in the grating ruler 1 to a A serial port interface 12 through which the grating ruler 1 communicates with an external host 2, a control unit 13 is connected in series between the serial port interface 12 and the confirmation unit 11, and the control unit 13 provides position signals through the serial port interface To confirm the position of the confirmation unit 11, the control unit 13 has an input port 131 for an external trigger position signal.

In this embodiment, the confirmation unit 11 includes a detection unit 111, which is used to detect the position signal of the grating scale 1, and the detection unit 111 is connected in series with a digital signal processor 112 at the rear end. The signal processor 112 is used to subdivide the position signal and combine it into an absolute position, and generate an overall position signal at the back end through the digital signal processor 112 , and the overall position signal is input to the host computer 2 through the serial port interface 12 .

In this embodiment, the control unit 13 includes an OR gate 132 (that is, the OR gate shown in the figure), the OR gate 132 has two input ports 132a and an output port 132b that outputs a signal to the confirmation unit 11, one of which The input port 132a is connected in series with the serial interface 12 , and the other input port 132a is connected in series with the input port 131 .

In this embodiment, it is assumed that on a grating ruler measuring instrument, grating rulers 1 (not shown in the figure) are respectively arranged on the X, Y and Z axes, and when the probe 3 of the measuring instrument measures to a certain After a fixed point, if you want to take pictures of the fixed point, the measurement signal through the probe 3 and the fixed point is input into the grating ruler 1 through the input port 131, and directly output to the OR gate 132 of the control unit 13. Confirm the unit 11 to generate a current overall position signal, and then directly pass through the serial port interface 12 and notify the camera 4 to take pictures through the host computer 13. Therefore, it is not necessary to communicate back and forth with the host computer through the serial port interface like the existing grating ruler, so there will be no Time delay when the position is latched.

The key point of the design of this utility model is to add an external trigger input port on the grating ruler, so that the grating ruler can not only communicate with the host computer through the serial port interface, but also directly input the external signal through the input port. In the grating ruler, the latch is directly required to achieve the effect of real-time latch and multi-axis grating encoder synchronous latch.

The above is only a preferred embodiment of the structure of the utility model, and does not limit the technical scope of the utility model in any way. The technical essence of the utility model makes any slight modification, equivalent change and modification to the above embodiments, all still belong to the scope of the technical solution of the utility model.

Claims (3)

1, a kind of absolute grating chi, it is characterized in that: comprise that one confirms the affirmation unit of grating chi absolute position, this confirmation unit is connected in series the serial ports interface of carrying out communication to the main frame of a confession grating chi and outside in the grating chi, being connected in series between this serial ports interface and the confirmation unit once the serial ports interface provides position signal to confirm the control module of position to confirmation unit, and this control module has an input port for the external trigger position signal.

2, absolute grating chi according to claim 1, it is characterized in that: this confirmation unit comprises the detecting unit of a detecting grating chi position signal, this detecting unit is the digital signals processor of absolute position in rear end serial connection one this position signal of segmentation, and produces an overall positions signal through serial ports interface input main frame in the rear end.

3, absolute grating chi according to claim 1, it is characterized in that: this control module comprises one or lock, should or lock have two input ports and an output signal delivery outlet to confirmation unit, one input port system is serially connected with this serial ports interface, another input port then is connected in series with this input port.

Images