CS263209B1 - Wiring for monitoring and evaluating the position of rotary indexing tables and for controlling their movements, especially for machine tools - Google Patents

Abstract

The circuit for monitoring and evaluating the position of rotary indexing tables and for controlling their movements, especially for machine tools, is intended for evaluating the position between the fixed and moving parts in such mechanisms where the mechanical arrangement itself ensures the required accuracy and rigidity of the connection. The circuit processes a non-specific signal of the mutual position of the fixed and moving parts, sensed by a common sensor from suitably spaced stops depending on the specific signal of the reference sensor. The circuit thus provides permanent information about the mutual position of both parts and at the same time allows controlling the smooth movement of the moving part to the desired position in any direction without the need for reversal.

Description

(54) Wiring for monitoring and evaluating the position of rotary indexing tables and for controlling their movements, especially for machine tools

The arrangement for monitoring and evaluating the position of rotary indexing tables and controlling their movements, especially for machine tools, is intended for evaluating the position between fixed and movable parts in such mechanisms where the mechanical arrangement itself ensures the required accuracy and rigidity of the binding. The wiring processes a nonspecific signal of the relative position of the fixed and moving parts, sensed by a common sensor from suitable distributed stops, depending on the specific signal of the reference sensor. The connection thus ensures permanent information about the mutual position of the two parts and at the same time enables to control in any sense the smooth movement of the movable part to the desired position without the necessity of reversing.

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The invention relates to a circuit for monitoring and evaluating the position of rotary indexing tables and controlling their movements, in particular for machine tools, by means of stops and switches, by processing their repeated signals in dependence on the reference position switch signal.

The idle states between the rotary and fixed part of the rotary indexing tables are provided mechanically by an indexing and reinforcing device which is controlled by an electrical connection to evaluate the relative position of the fixed and rotary part. Wiring for the control of indexing tables is not required for the degree of positional accuracy as in the case of the electro-wiring of positional coupling servo-mechanics, since the actual accuracy is given by the design and state of the mechanics for positioning and strengthening. The hitherto known circuits process the signals of the switches assigned to the individual positions of the rotary part of the indexing table. These switches are controlled by stops placed directly on the rotating part of the table. However, such a method can only be used for a smaller number of indexed positions. If a plurality of indexed positions are required, the rotary indexing table is controlled such that the motion of the pusher mechanism is derived from the movement of the rotary part via the gears, which switches the set of switches by means of coded signals.

In order to achieve a reliable function and suitable speeds, the movement of the rotary part is usually divided into two phases. First, the rotary part is quickly rotated to the preset position, which is accompanied by the passage of this position. Relevant cue

263 209 closes a switch 8 which sends a coincidence signal activating the reversed slow motion of the rotating part back to the coincidence location. The movement is then terminated by indexing and strengthening the rotating part of the table. The described methods of controlling the position of the indexing tables when a smaller number of positions are required require an associated stop and limit switch for each position. In the case of multi-position table control, a relatively complicated conversion to the cage system is required. In any case, a reversible mechanical system is required which, upon receiving the coincidence signal of the selected position, changes the direction of rotation of the rotary part and slows its operation.

The above drawbacks are overcome by a circuit for monitoring and evaluating the position of the indexing tables and for controlling their movements, in particular for machine tools according to the invention, characterized in that the second output of the distance calculation block is connected to the first input of the counter block for accurate position, on the one hand to the first input of the CW sense block and on the other hand to the first input of the CCW sense block. A CW position switch is connected to the second inputs of these counter blocks, a CCW switch is connected to their third inputs, and a reference position switch connected to a second distance calculation input is connected to their fourth inputs. The data outputs of the counter blocks are connected both to the data inputs of the stop control block, to whose synchronization input the precision position switch is connected, and to the data inputs of the preselection block, the output of which is connected to the second input of the deceleration block.

The arrangement for monitoring and evaluating the position of the indexing tables and controlling their movements, in particular for the machine tool according to the invention, makes it possible to obtain in a simple manner permanent information on the relative position of the two indexing table parts. without reversing.

Connection example for monitoring and evaluating the position of indexing tables and for controlling their movements according to

3 263 209 of the invention is shown schematically in the attached drawing.

The machine cycle control block 6 is connected by its output 11 to the first input 21 of the block 2 to calculate the distance of the actual position of the pivot part from the desired position. The distance calculation block 2 is connected by its first output 23 to the first input 31 of the block 3 to control the deceleration of the rotating part and by its second output 24 both to the first input 41 of the counter block 4 for precise position and to the first input 51 of the counter block 5 the sense retardation CW and, on the other hand, to the first input 61 of the counter block 6 for sense retardation CCW. A CW position switch 12 is connected to the second inputs 42, 52, 62 of the blocks 4, 2, 2, 2. A CCW position switch is connected to their third inputs 43, 21 »63 and a switch is connected to their fourth inputs 44. 21» 64 14 of the reference position, which is simultaneously connected to the second input 22 of the distance calculation block 2. Block 4 for its counter position is further to its data output 45 connected both to a first data input 71 of the unit 2 a preset formed by a comparative evaluation circuits for slowing movement of the pivoting part, first, the first data input 81 of the block 2 P ^ro steering stop, formed by the comparative and the evaluation circuitry for the exact position of the rotatable part. The counter sense block 6 of the CCW sense retardation is connected to its data output 65 on the one hand. the third data input 73 of block 7, the presets, on the other hand, to the third data input 83 of block 2 for controlling the stop. A precise position switch 15 is connected to the fourth synchronization input 84 of the stop control block J3, and a fifth actuation input 85 of this block is connected to its output 33 with a deceleration control block 2 connected simultaneously to the input 91 of the first deceleration output block 9. rotating parts. Furthermore, the stop control block 8 is connected via its output 86 to the input 101 of the second output switch block 10 intended to start and stop the rotary part.

From the machine cycle control block χ the signal for entering the desired indexing table position comes to the distance calculation block 2. Upon receiving the signal from switch 1 of the reference position, the surrender block 2 is activated

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283 209 laziness. After performing the calculation, the signal sent from the second output 24 of this block releases the first input 41 of block 4; the exact position counters, the first input 51 of the block C of the deceleration counter, and the first input 61 of the block 6 of the CCW deceleration counter. Simultaneously when the desired distance is less than the set deceleration, or when the first input when there is no registered signal from the switch 14 the reference position, <them from the first inlet 23 of the unit 2 for calculating the distance among ⁺ i signal is sent to a first input 31 of the block 2 P ^ro control deceleration and a signal from the output 33 of this block activates the block 9 of the first output switches. When the counter blocks 6, 6 are released, these counters synchronously add or subtract, depending on the sense of movement, pulses coming to their second inputs 42, 52, 62 from the switch 12 of position CW and to their third inputs 43, 53. 63 from the CCW position switch 13. The switching sequence of the switches 12, 13 distinguishes between the sense of movement of CW and CCW in block 2 of the counter to slow the sense CW and in block 2 of the counter to slow the sense CCW. The signal from the data output 55 of the CW sense slower comes to the second data input 72 of the preset block 2, to whose third data input 73 the signal from the data output 65 of the block 6 of the CCW sense slower comes. The applied signals are compared and evaluated in the preset block 2 and the resulting signal from the output 74 of this block is fed to the second input 32 of the block 2 for deceleration control. The signal in output 33 of this block activates block 2 of the first output switches, thereby slowing down the movement of the rotary part, and block 8 for stop control, whose first data input 81 receives a signal from data output 45 of counter block 4 for precise position and Synchronous input 84 receives a signal from the exact position switch 22. After comparing and evaluating all the signals applied to the block 8 for controlling the stop, the block 10 of the second output switches is activated by the signal from the output 86 of this block. This stops the movement of the rotating part of the table and its mechanical strengthening.

The circuit according to the invention can be used in all mechanisms. nisms performing movement indexed in working positions, such as the indexing tables already mentioned, turret heads, tool magazines, workpiece magazines «below.

Claims (1)

SUBJECT OF THE INVENTION 263 209 Connections for monitoring and evaluating the position of indexing tables and for controlling their movements, in particular for machine tools consisting of a machine cycle control block connected to the first input of the distance calculation block connected by its first output to the first input of the deceleration control block The output of which is connected to the input of the first output switch block and to the activation input of the stop control block connected by its output to the input of the second output switch block, characterized in that the second output (24) of the calculation block (2) the distance is connected both to the first input (41) of the counter (4) for precise position, and to the first input (51) of the counter (5) to slow down the CW sense and to the first input (61) of the counter (6) sense of the CCW, and connect to the second inputs (42, 52, 62) of these counter blocks n CW position switch (12), a CCW position switch (13) is connected to their third inputs (43, 53, 63) and a reference position switch (14) connected simultaneously to their fourth inputs (44, 54, 64) the second input (22) of the distance calculation block (2), while the data outputs (45, 55, 65) of the counter blocks (4, 5, 6) are connected to the data inputs (81, 82, 83) of the block (8) for stop control, to the synchronization input (84) of which the exact position switch (15) is connected and to the data inputs (71, 72), 73) a preset block (7), the output of which (74) is connected to a second input (32) of the deceleration block (3).