JPS6240752Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a digital count display device that digitally displays the amount of rotation of a feed screw of a machine tool, that is, the amount of feed of a cutter, etc. The purpose is to make it applicable without changing the encoder.

The configuration of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

Reference numeral 2 denotes a holder fixed to the main body of the machine tool, on which the shaft of the feed screw 4 is rotatably supported. In the case of general machine tools, the holding body 2
An index is provided on the flange 6 of the feed screw 4, a dial is fitted onto the feed screw 4, and the amount of rotation of the feed screw 4 is displayed on a scale using the index on the flange 6 and the scale on the dial. In this embodiment, the dial board is removed, and a casing 8 is loosely fitted onto the shaft of the feed screw 4 in place of the dial board. Casing 8
An annular mounting member 9 is removably fixed with a screw. The casing 8 is held by fitting the inner circumferential surface of the annular portion of the member 9 into the outer circumferential surface of the flange portion 6 and tightening the adjustment screws 12 arranged in a plurality of screw holes provided through the member 9. It is fixed to body 2. The adjustment screw 12 constitutes a rotation stopper mechanism for the flange 6 of the casing 8,
The rotation stopping mechanism may have any structure as long as it prevents the casing 8 from rotating relative to the flange 6, and is not particularly limited to the adjustment screw 12. Incidentally, depending on the outer diameter of the flange portion 6, a large-diameter mounting member 10 may be screwed to the casing 8 as shown by the dotted line. Further, when the collar 6 has a small diameter, a large diameter collar member 6a may be fixed to the collar 6 with screws as shown in FIG. Reference numeral 14 denotes a plate member fixed to the casing 8, to which a substrate of a digital display 16 is fixed, and the display portion of the display 16 is located directly below the window formed in the casing 8. Reference numeral 18 indicates two light receiving elements (one is not shown) disposed on the member 14, and reference numeral 20 indicates two light emitting elements (one is not shown) disposed on the plate member fixed to the member 14. (not shown), and the light emitting element 20 and the light receiving element 1
8 are opposed to each other with a predetermined gap therebetween. A rotating body 22 is rotatably attached to the casing 8 via bearing members 28 and 30. Reference numeral 32 denotes an annular slit plate fixed to the flange 22d of the rotating body 22, and the slit plate 32 is located between the light receiving element 18 and the light projecting element 20. Incidentally, a known fixed slit plate (not shown) is arranged in front of the light receiving element 18. A collar 34 is fixed to the shaft portion of the feed screw 4, and a protrusion 36 is fixedly provided on the outer peripheral surface of the collar 34 in the axial direction. A groove 38 is formed in the inner circumferential surface of the rotating body tube portion 22a in the axial direction, and the groove 38 fits into the projection 36. The protrusion 36 and the groove 38 constitute a rotational coupling structure. Numerals 40 and 42 are stopper nuts that are screwed into threaded portions at the ends of the feed screw 4. Reference numeral 44 denotes a case attached to the plate member 14, in which an integrated circuit constituting the electronic circuit of the apparatus is built. 46 is a power supply connector, and 50 is a handle detachably fixed to one end of the feed screw. FIG. 3 is a block diagram of the electronic circuit of this device. In the figure, 54 is a pulse encoder consisting of a slit plate 32, a light emitter, light receiving elements 20, 18, an amplifier circuit, and a waveform shaping circuit, that is, an A-D converter. 56 is an amplifier circuit, 58 is a Schmitt circuit, 60 is a direction discrimination multiplier circuit, 62 is a polarity inversion circuit, 64 is a frequency division circuit, and 66 is a frequency division ratio changeover switch. The frequency dividing circuit 64 is provided with a plurality of contacts 68, 70, 72, 74, 76 corresponding to several types of feed screws with different feed pitches, and a movable switch piece 78 of the switch 66 contacts the contact 68. Then, the circuit 64 works as a 1/2 frequency divider circuit, when it contacts contact 70 it works as a 1/4 frequency divider circuit, when it contacts contact 72 it works as a 1/6 frequency divider circuit, and when it contacts contact 74 it works as a 1/8 frequency divider circuit. It functions as a frequency dividing circuit, and is configured to function as a 1/10 frequency dividing circuit when contact 76 is contacted. Displays such as 1/2 frequency division, 1/4 frequency division, etc. are provided on the casing 8 side, and the desired frequency division ratio can be set by adjusting the knob 80 to the display. ing.
Note that the frequency division ratio described above is an example of implementation, and it is of course possible to use other frequency division ratios, and the number of contacts is not particularly limited. the contact 68,
70, 72, 74, 76, the movable switch piece 78, and the necessary circuits in the frequency dividing circuit 64.
A frequency division ratio selecting means is configured to convert the frequency division ratio of 1 to a desired frequency division ratio among a plurality of preset frequency division ratios. This frequency division ratio selection means can use a known electronic technique, and the means is not limited to a special one. The switch 66 and reset switch 82 are mounted in position on the casing 8. 84 is an up-down counter, 86 is a zero detection circuit, 88 is an oscillation circuit, 9
0 is a reset circuit, 92 is a dynamic drive circuit, 94 is a display driver, and 16 is a display, which has a polarity display section 16a.

Next, the operation of this embodiment will be explained.

To set up this device on a general machine tool with a dial display, first remove the handle 50 and nut 4.
0 and 42 from the feed screw 4, and then remove the dial from the shaft of the feed screw 4. Next, the collar 34 is fixed to the shaft 4. Next, the tube part 22a of the rotating body 22 is inserted into the shaft part of the feed screw 4, the groove 38 is fitted into the projection 36, and the side surface of the casing 8 is inserted into the member 9.
It comes into contact with the side end surface of the flange portion 6 of the holder 2 via. Next, the adjusting screw 12 is tightened in the screw hole so as not to apply an unbalanced load to the rotating body 22, and the casing 8 is fixed to the flange portion 6. Next Natsu 4
0, 42 and the handle 50. Next, if the feed pitch of the feed screw 4 is standard, turn the knob 80 to move the switch piece 78 to the contact point 7.
0. As a result, the frequency division ratio of the frequency dividing circuit 64 is set to 1/4.

In the above configuration, when the feed screw 4 is rotated by the handle 50, the rotating body 22 and the slit plate 32 are rotated, and two types of pulses having a phase shift of 90 degrees from each other are output from the two light receiving elements 18. . These pulses are amplified by an amplifier circuit 56, passed through a Schmitt circuit 58, and shaped into waveforms.
The pulse is sent to a direction discrimination multiplier circuit 60, where the pulse is multiplied by four. When the rotation direction of the handle 50 is forward rotation, the output terminal OA of the amplifier circuit 56 receives a pulse whose phase is delayed by 90 degrees with respect to the pulse at the output terminal OB, and the output terminal OB receives a pulse delayed by 90 degrees with respect to the pulse at the output terminal OA. A pulse whose phase is advanced by .degree. is output, and a pulse four times that of this pulse appears at the output terminal OE of the circuit 60. When the handle 50 is rotated in the opposite direction, the output end OA of the amplifier circuit 56 receives a pulse that is 90° in phase with respect to the pulse at the output end OB, and the output end OB receives a pulse that is 90° in phase with respect to the pulse at the output end OA.
A pulse whose phase is delayed by .degree. is output, and a pulse four times this pulse appears at the output terminal OF of the circuit 60. Now, the case where a pulse appears at the output terminal OE of the circuit 60 will be explained.

The pulse output from the output terminal OE to the circuit 60 appears at the output terminal OH of the polarity reversing circuit 62, and the pulse output from the output terminal OE
The pulse appearing on OH is supplied to the frequency dividing circuit 64,
Here, the frequency of the pulse is divided into 1/4 and inputted to the up-count terminal of the up-down counter 84. At this time, the polarity display section 16a displays "+", indicating that the amount of rotation of the feed screw 4 is in the positive rotation side range from zero. The information counted by the counter 84 is sent to the dynamic drive circuit 9.
2 and then displayed on the display section of the display 16 as a decimal value. This display value indicates the actual feed amount of the cutter. When the handle 50 is rotated in the reverse direction, a pulse signal is sent to the down count terminal of the counter 84, and the contents of the counter 84 are sequentially decreased. When the reset switch is pressed to set zero, and the handle 50 is then rotated in the opposite direction, "-" is displayed on the polarity display section 16a due to the action of the zero detection circuit 86 and the polarity reversal circuit 62. The pulse appearing at the output terminal OF of the circuit 60 appears at the output terminal OH of the circuit 62 by the action of the flip-flop in the polarity inverting circuit 62, and the output pulse is divided into 1/4 pulses and sent to the up-down counter 84. is input to the up count terminal. When the handle 50 is rotated in the forward direction while "-" is displayed on the polarity display section 16a, the output pulse of the frequency dividing circuit 64 is input to the down count terminal of the counter 84.

When installing this device on a feed screw that has a finer pitch than the standard one and the blade feed amount per revolution is 1/2 that of the standard one, turn the knob 80 to select the contact point 74 that corresponds to that pitch. and the circuit 64 is 1/
Set to 8 frequency divider circuit. As a result, when the feed screw is rotated once, half the amount of pulses is sent to the counter 84 compared to the above embodiment. Therefore, on the display section of the display 16, the actual feed amount of the cutter etc. by the feed screw is digitally displayed as a correct value. In this case, if there is no frequency division ratio selection means, the slit plate 32 would have to be changed, which would be extremely inconvenient.

As mentioned above, the present invention allows the frequency dividing ratio of the frequency dividing circuit to be selected so that the display can display the correct value in accordance with the pitch of the feed screw to which this device is attached, so that different feed pitches can be selected. This device has the advantage of being able to be used with several types of feed screws without changing the slit plate.

[Brief explanation of the drawing]

The figures show a preferred embodiment of the present invention, with FIG. 1 being a sectional view, FIG. 2 being a sectional view of the mounting portion, and FIG. 3 being an electronic block circuit diagram of the device. 4...Feed screw, 6...Brim portion, 8...Casing, 16...Digital display, 18...Light receiving element, 20...Light projecting element, 22...Rotating body, 32
...Slit plate, 48...Reset button, 54
...A-D converter (pulse encoder), 56...
...Amplification circuit, 58... Schmitt circuit, 60...
Direction discrimination multiplier circuit, 62...Polarity inversion circuit, 64
...Frequency dividing circuit, 66... Frequency division ratio selection switch, 6
8, 70, 72, 74, 76... Contact, 78...
Switch piece, 80... Knob, 82... Reset switch, 84... Counter, 86... Zero detection circuit, 88... Oscillation circuit.

Claims (1)

[Scope of utility model registration request] The outer peripheral surface of a tubular rotating body 22 is rotatably supported in the casing 8 so as not to move in the axial direction, and the slit plate 3 of the pulse encoder 54 is mounted on the rotating body 22.
2, while attaching the feed screw 4 of the machine tool.
A rotation coupling structure consisting of an axial groove 38 and a protrusion 36 slidably fitted into the axial groove 38 between the portion protruding from the collar 6 of the machine tool and the inner diameter side of the rotating body 22. The rotating body 22 is fitted into the feed screw 4 via the rotation coupling structure so as to be able to rotate in conjunction with the feed screw 4, and the flange portion 6 of the casing 8 is
A rotation stop mechanism is provided to prevent rotation against the
The casing 8 is attached to the flange 6 of the machine tool,
On the other hand, in a device that can be detachably attached so as not to rotate, the feed screw 4 is
a counter 84 that counts the amount of feed of a cutter or the like due to the rotation of the counter 84; a display 16 that displays the contents of the counter 84; and a frequency dividing circuit 6 provided between the counter 84 and the pulse encoder 54.
4, and a frequency division ratio for converting the frequency division ratio of the frequency division circuit 64 into a desired frequency division ratio from among a plurality of preset frequency division ratios according to the pitch of the feed screw 4. A feed amount digital count display device for a machine tool, characterized in that it is equipped with a selection means.