JP2011221850A - Electronic cam controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the positioning precision of slave axial control without using a servo motor or the like.SOLUTION: This electronic cam controller is provided with: a signal generation part 10 for generating a clock signal c based on main axial pulses a, b of an encoder 3; a slave axial pulse generation part 20 for counting a clock signal c to a direction shown by a direction signal d, and for performing frequency division to make a frequency division rate variable, and for outputting it as a slave axial pulse f; and a frequency division rate control part 30 for controlling the frequency division rate of the slave axial pulse generation part 20 based on the clock signal c and the direction signal d. The frequency division rate control part 30 controls the frequency division rate of the slave axial pulse generation part 20 based on the rate of main axial moving quantity to slave axial moving quantity included in cam curve data K preliminarily recorded in a memory part 32.

Description

  The present invention relates to an electronic cam controller that drives a drive target unit based on preset cam curve data to electrically realize a cam operation.

  This type of electronic cam controller is configured to divide an output signal of an encoder attached to a main shaft in accordance with preset cam curve data to generate a slave shaft pulse and to control the driving of a slave stepping motor or the like Since different cam operations are realized by changing the setting of the cam curve data, it is widely used in various machines having a cam mechanism (for example, Patent Document 1).

JP-A-3-073003

  However, in the case of the above conventional example, if the spindle is hunted due to various factors, an error occurs in the advance amount of the slave shaft with respect to the actual advance amount of the spindle, and accordingly, the positioning accuracy of the slave shaft control is lowered. . However, when optimal control is performed using a servo motor or the like, hunting is reduced and the above problem is alleviated, but this causes another problem that the overall configuration of the control device is complicated and the cost is increased.

  The present invention was created under the above-mentioned background, and the main object thereof is an electronic cam controller capable of improving the positioning accuracy of slave shaft control without using a servo motor or the like. Is to provide.

  In order to solve the above-described problems, an electronic cam controller according to the present invention includes a signal generator that generates at least a clock signal based on a spindle pulse of a spindle encoder, and counts and divides the clock signal in a direction indicated by a direction signal. Divide the variable ratio so that it can be varied and output at least the signal as a driven pulse synchronized with the main pulse, and control the dividing ratio of the driven pulse generator based on the clock signal and direction signal And a frequency division ratio control unit. In particular, the division ratio control unit displays the cam curve using the relationship between the main shaft movement amount and the sub shaft movement amount, and the timing control unit that generates the data switching signal and the data switching direction signal based on the clock signal and the direction signal. A memory unit in which the cam curve data is stored in advance, and a switching unit that sequentially selects and outputs the cam curve data on the memory unit at the timing indicated by the data switching signal while switching the direction indicated by the data switching direction signal; A frequency division ratio adjustment unit that changes a frequency division ratio of the slave pulse generation unit based on a ratio between the main shaft movement amount and the subordinate shaft movement amount included in the cam curve data output from the switching unit. ing. When the data switching signal becomes active, the timing control unit counts the subsequent clock signal in the direction indicated by the direction signal, and the count value changes by the amount of spindle movement output from the switching unit. A signal output unit that outputs a data switching direction signal whose direction is reversed at a timing when the data switching signal is first activated immediately after the direction signal is changed. .

  According to the present invention, when the spindle pulse of the spindle encoder is input, the signal generation unit generates a clock signal based on the spindle pulse, and the slave pulse generation unit counts the clock signal in the direction indicated by the direction signal. The signal is divided and this signal is generated as a slave axis pulse. The frequency division ratio of the slave shaft pulse generation unit is controlled based on the ratio between the main shaft movement amount and the sub shaft movement amount included in the cam curve data prepared in advance by the frequency division ratio control unit.

  Therefore, a slave pulse is generated using a spindle pulse indicating the rotation amount of the spindle and a direction signal indicating the rotation direction of the spindle, and the ratio between the spindle movement amount and the slave shaft movement amount included in the cam curve data prepared in advance. Therefore, even if the spindle hunts due to various factors, there is no error in the advance amount of the slave shaft with respect to the actual advance amount of the master shaft. The accuracy will not be lowered. In addition, since a servo motor or the like is not used, there is an effect that both cost reduction and high performance can be achieved.

  Preferably, a cam curve data storage unit in which a plurality of types of cam curve data are stored in advance, an input unit to which cam switching information for switching the cam shape type is input, and cam curve data on the cam curve data storage unit And a cam data management unit for updating the cam curve data on the memory unit by reading out the data as the cam switching information input through the input unit, transferring the cam data to the memory unit at the timing indicated by the cam data request signal It is good to make it. In this case, a switching unit having a function of outputting a cam data request signal indicating that the final data of the cam curve data has been selected from the memory unit is used.

According to the subordinate concept invention, when the cam switching information is input through the input unit, the cam curve data is read from the cam curve data storage unit according to the cam switching information, and the recorded content on the memory unit is the cam data request signal. The cam curve data is updated at the timing shown.

  Therefore, the cam shape can be continuously changed without stopping the cam operation, and not only the working efficiency is improved but also the range of use can be expanded.

It is a block diagram of the electronic cam controller which concerns on embodiment of this invention. It is a graph which shows the cam curve data recorded on the memory part of the controller. It is a timing chart of the main signal for demonstrating basic operation | movement of the signal generation part of the same controller, a driven-axis pulse generation part, etc. It is a timing chart of the main signal for demonstrating the basic operation | movement at the time of the spindle normal rotation of the frequency division ratio control part of the controller. It is a timing chart of the main signal for demonstrating the basic operation | movement at the time of reverse of the main axis | shaft of the division ratio control part of the controller. It is a timing chart of the main signal for demonstrating the basic operation | movement at the time of the main axis | shaft of the division ratio control part of the controller shifting from reverse rotation to normal rotation. It is a block diagram which shows a part of frequency division ratio control part for demonstrating the modification of the same controller.

  Hereinafter, an electronic cam controller according to an embodiment of the present invention will be described with reference to FIGS. In addition, what is unclear as to the correspondence between the invention-specifying matters described in the claims and the components of the electronic cam controller will be shown together in the description of reference numerals described later.

  As shown in FIG. 1, an electronic cam controller A as an example receives spindle pulses a and b output from an optical two-phase pulse output type encoder 4 connected to a stepping motor 3 for driving a spindle as shown in FIG. The slave shaft pulse f and the like are generated, the slave shaft driving stepping motor 5 is driven through the driver B, and the slave shaft 2 is rotated in synchronization with the main shaft 1. In the figure, reference numeral 10 denotes a signal generation unit, 20 denotes a driven shaft pulse generation unit, and 30 denotes a frequency division ratio control unit, and an electronic cam controller A is configured by each unit. Hereinafter, the configuration of each unit will be described in detail.

  The signal generator 10 generates a clock signal c (see FIG. 3 etc.) by multiplying the spindle pulse a (or spindle pulse b) by a predetermined number, and detects the phase difference between the spindle pulse a and the spindle pulse b. Thus, the circuit configuration is such that the direction signal d (see FIG. 3 and the like) is generated. When the direction signal d is at the H level, the main shaft 1 indicates normal rotation, and when the direction signal d is at the L level, the main shaft 1 indicates reverse rotation.

  The slave axis pulse generator 20 has a circuit configuration mainly including a variable frequency divider that counts the clock signal c in the direction indicated by the direction signal d and divides the clock signal c so that the frequency division ratio can be varied. A direction signal k is generated and output. The frequency division ratio for dividing the clock signal c is controlled based on the signal o generated by the frequency division ratio control unit 30.

  The driven shaft pulse f is a signal for controlling the rotation angle of the driven shaft driving stepping motor 5 and is a signal synchronized with the main shaft pulse a (see FIG. 3 and the like). The direction signal k is a signal for controlling the rotation direction of the stepping motor 5. A method for generating the driven pulse f and the direction signal k will be described later.

  The frequency division ratio control unit 30 is a circuit that generates the signal o based on the clock signal c and the direction signal d and controls the frequency division ratio of the driven-axis pulse generation unit 20. In the present embodiment, the timing control unit 31, the memory unit 32, the switching unit 34, and the frequency division ratio adjustment unit 35 are configured.

  With respect to the timing control unit 31, when a data switching signal i, which will be described later, becomes active, the up / down counter 311 that starts counting the subsequent clock signal c in the positive and negative directions indicated by the direction signal d, and the count value of the up / down counter 311 are When the main shaft movement amount MAIN (n) output from the switching unit 34 changes, this timing is output as the data switching signal i. On the other hand, immediately after the direction signal d changes, the data switching signal i becomes active first. And a signal output unit 312 that outputs a data switching direction signal j whose direction is reversed at the timing.

  For the up / down counter 311, the clock signal c and the direction signal d output from the signal generation unit 10 are input, while the spindle movement amount that is a signal related to the spindle movement amount MAIN (n) output from the switching unit 34. Data h is input, and a data switching signal i is input to the reset / set input. The count value of the up / down counter 311 is output to the signal output unit 312 as count data g. A specific operation of the up / down counter 311 will be described with reference to FIGS.

  When the direction signal d is at the H level, it counts up every time the clock signal c is input, and is reset every time the data switching signal i becomes active. After that, when the direction signal d changes from H level to L level as shown in FIG. 5, the spindle movement amount data h changes from count up to count down at that time and the data switching signal i becomes active. Set. Then, as shown in FIG. 6, when the direction signal d changes from L level to H level, it changes from countdown to countup at that time. Thereafter, the above operation is repeated.

  The signal output unit 312 is a circuit mainly including a comparator that compares the count data g output from the up / down counter 311 and the spindle movement amount data h output from the switching unit 34. The comparison result and direction The data switching signal i and the data switching direction signal j are generated based on the signal d. A specific operation of the signal output unit 312 will be described with reference to FIGS.

  The data switching signal i becomes active for a predetermined period (H level in the present embodiment) when the count data g becomes equal to the spindle movement amount MAIN (n) when the direction signal d is at the H level (for example, , T0, t1, t2 shown in FIG. 4, t8 shown in FIG. 6, and the like, and when the direction signal is at the L level, the value of the count data g becomes equal to 0 (for example, FIG. 5). T4, t5, etc.). The direction signal d is inverted from the H level to the L level when the data switching signal i is first activated immediately after the direction signal d changes from the H level to the L level (for example, t4 shown in FIG. 5). The direction signal d is inverted from the L level to the H level when the data switching signal i is first activated immediately after the direction signal d changes from the L level to the H level (for example, FIG. 6). T8, etc.). The data switching signal i and the data switching direction signal j are guided to the data control unit 341 of the switching unit 34 in addition to the up / down counter 311.

  The memory unit 32 is a storage unit in which cam curve data K representing a cam curve using the relationship between the main shaft movement amount and the slave shaft movement amount is recorded in advance. In the present embodiment, a plurality of registers are used. For the cam curve data K, β data pairs of a main shaft movement amount MAIN (n) and a sub shaft movement amount SUB (n) (n = 1, 2... Α, β: 1 ≦ α <β) Each data pair can be selectively output by a multiplexer 342 described later. For the main shaft movement amount MAIN (n) and the sub shaft movement amount SUB (n), the displacement amounts of the start point and the end point are represented by positive and negative values for each predetermined section on the main shaft and the sub shaft. FIG. 2 shows an example of the cam curve. The cam curve data K recorded in the memory 32 includes a main shaft movement amount MAIN (1) and a sub shaft movement amount SUB (1), a main shaft movement amount MAIN (2) and a sub shaft movement amount SUB (2),. A data group in which data pairs of the spindle movement amount MAIN (β) and the slave shaft movement amount SUB (β) are arranged in order along the cam curve.

  The switching unit 34 includes a data control unit 341 and a multiplexer 342, and the data switching signal i is switched while sequentially switching the data pairs included in the cam curve data K on the memory unit 32 in the direction indicated by the data switching direction signal j. The signals are sequentially selected and output at the timing shown.

  For example, it is assumed that the data pair currently selected by the switching unit 34 among the cam curve data K on the memory unit 32 is the main shaft movement amount MAIN (1) and the sub shaft movement amount SUB (1). In a state where the data switching direction signal j is at the H level, every time the data switching signal i becomes active, the main shaft moving amount MAIN (2), the driven shaft moving amount SUB (2), and the main shaft moving amount MAIN (3) from the memory unit 32. ) And slave shaft movement amount SUB (3)... Are sequentially selected and output. Even if the data switching signal i does not become active, when the data switching direction signal j changes from the L level to the H level, the selection output of the data pair included in the cam curve data K on the memory unit 32 is completely the same as described above. Switch in the same way. When the main axis movement amount MAIN (β) and the sub axis movement amount SUB (β), which are the final data of the cam curve data K, are selectively output, thereafter, the main axis movement amount MAIN (1) and the sub axis movement amount MAIN (1) The axis movement amount SUB (1) can be selected and output.

  Further, it is assumed that the data pair currently selected by the switching unit 34 among the cam curve data K on the memory unit 32 is the main shaft movement amount MAIN (β) and the sub shaft movement amount SUB (β). In a state where the data switching direction signal j is at the L level, every time the data switching signal i becomes active, the main shaft movement amount MAIN (β-1), the driven shaft movement amount SUB (β-1), and the main shaft movement from the memory unit 32. The amount MAIN (β-2) and the driven shaft movement amount SUB (β-2)... Are sequentially selected and output. Even if the data switching signal i does not become active, when the data switching direction signal j changes from the H level to the L level, the selection output of the data pair included in the cam curve data K on the memory unit 32 is completely the same as described above. Switch in the same way. When the main axis movement amount MAIN (1) and the sub axis movement amount SUB (1), which are the final data of the cam curve data K, are selectively output, thereafter, the main axis movement amount MAIN (β) and the sub axis movement amount MAIN (β) The axis movement amount SUB (β) can be selected and output.

  The data control unit 341 is an n (set to a value equal to the number of data pairs included in the cam curve data K recorded in the memory unit 32) with the data switching signal i and the data switching direction signal j as inputs. is there. That is, when the data switching signal i becomes active while the data switching direction signal j is at the H level, the count is incremented each time. On the other hand, when the data switching signal i becomes active while the data switching direction signal j is at the L level, the countdown is performed each time. Such a count value is output to the selection input of the multiplexer 342 as the data selection signal q.

  The multiplexer 342 is a selector that selects the cam curve data K on the memory unit 32 in accordance with the data selection signal q, and outputs the selected cam curve data K to the driven pulse generator 20 and the signal output unit 312. Yes. For example, when the data selection signal q indicates a count value of 1, the multiplexer 342 selects and outputs the spindle movement amount MAIN (1) and the slave axis movement amount SUB (1) from the cam curve data K on the memory unit 32. Is done. When the data selection signal q indicates the count value 2, the multiplexer 342 selects and outputs the spindle movement amount MAIN (2) and the slave axis movement amount SUB (2) from the cam curve data K on the memory unit 32. Is done.

  A signal relating to the spindle movement amount MAIN (n) output from the multiplexer 342 is represented as spindle movement amount data h, and a signal relating to the slave axis movement amount SUB (n) is represented as slave axis movement amount data e. The spindle movement amount data h is output to the signal output unit 312, and both the spindle movement amount data h and the slave shaft movement amount data e are output to the frequency division ratio adjustment unit 35.

  For the frequency division ratio adjustment unit 35, the ratio of the main shaft movement amount MAIN (n) and the sub shaft movement amount SUB (n) included in the cam curve data K output from the switching unit 34 (SUB (n) / MAIN ( n) is calculated, and based on this ratio, a signal o for changing the frequency division ratio of the driven pulse generator 20 is generated.

  In addition to generating the main shaft pulse f as described above, the driven shaft pulse generation unit 20 generates the direction signal k based on the direction signal c and the driven shaft movement amount SUB (n). That is, when the direction signal c indicates normal rotation and the driven shaft movement amount SUB (n) indicates a positive value, the direction signal k is set to H level (forward rotation) and the driven shaft movement amount SUB (n) is a negative value. Is indicated, the direction signal k is set to L level (reverse rotation). On the other hand, when the direction signal c indicates reverse rotation, when the driven shaft movement amount SUB (n) indicates a positive value, the direction signal k is set to L level (reverse rotation), and the driven shaft movement amount SUB (n) indicates a negative value. In some cases, the direction signal k is at the H level (forward rotation).

  The main shaft pulse f and the direction signal k thus generated are output to the driver B, and the driver B generates each phase excitation signal of the stepping motor 5 for driving the slave shaft.

  The operation of the electronic cam controller A configured as described above will be described with reference to FIGS.

  The main shaft 1 is rotated by the stepping motor 3, and main shaft pulses a and b are input from the encoder 4 in response thereto. As shown in FIG. 3, the clock signal c and the direction signal d are generated in accordance with the input of the main axis pulses a and b, and the clock signal c is divided. As a result, the slave axis pulse f is generated. The frequency division ratio of the clock signal c is proportional to the ratio of the spindle movement amount MAIN (n) and the slave axis movement amount SUB (n) included in the cam curve data K on the memory unit 32, and the slave axis pulse is accordingly generated. The pulse width of f changes. Such a slave shaft pulse f or the like is output to the driver B, and each phase excitation signal is generated by the driver B, and the stepping motor 5 is driven accordingly. As a result, the driven shaft 2 rotates in synchronization with the main shaft 1. The main axis movement amount MAIN (n) and the sub axis movement amount SUB (n), which are indispensable for the generation of the slave axis pulse f, are generated as follows.

  First, in the state where the direction signal d is at the H level as shown in FIG. 4, the up / down counter 311 counts up every time the clock signal c is input from the time t0. During the counting up, the data pair selected and output by the multiplexer 342 among the cam curve data K on the memory unit 32 is the spindle movement amount MAIN (α) and the slave axis movement amount SUB (α). . Thereafter, when the count value of the up / down counter 311 matches the value “l” of the spindle movement amount MAIN (α) output from the multiplexer 342, the data switching signal i becomes active at time t1. Along with this, the up / down counter 311 is reset, and the data pair selectively output by the multiplexer 342 is converted from the spindle movement amount MAIN (α) and the slave axis movement amount SUB (α) to the spindle movement amount MAIN (α + 1) and the slave axis. Changes to the axis travel SUB (α + 1).

  When the up / down counter 311 counts up every time the clock signal c is input from time t1, the count value of the up / down counter 311 coincides with the value 'm' of the spindle movement amount MAIN (α + 1) output from the multiplexer 342. At time t2, the data switching signal i becomes active. Along with this, the up / down counter 311 is reset, and the selectively output data pair output from the multiplexer 342 is converted from the spindle movement amount MAIN (α + 1) and the slave shaft movement amount SUB (α + 1) to the spindle movement amount MAIN (α + 2). And the driven shaft movement amount SUB (α + 2).

  Thereafter, when the direction signal d changes from H level to L level at time t3 as shown in FIG. 5, the up / down counter 311 counts down every time the clock signal c is input. It is assumed that the data pair selectively output from the multiplexer 342 at this time is the main shaft movement amount MAIN (β) and the sub shaft movement amount SUB (β). When the up / down counter 311 underflows at time t4, the data switching direction signal j changes from the H level to the L level, and the data pair selected and output from the multiplexer 342 includes the spindle movement amount MAIN (β) and the slave axis movement. The amount changes from the amount SUB (β) to the main shaft movement amount MAIN (β-1) and the sub shaft movement amount SUB (β-1). At the same time, the up / down counter 311 is set to the value ‘l’ of the spindle movement amount MAIN (β−1).

  When the up / down counter 311 counts down every time the clock signal c is input from time t4 and each underflows at time t5, the data switching signal i becomes active, and the data pair selected and output from the multiplexer 342 becomes the spindle movement amount MAIN. It changes from (β-1) and slave shaft movement amount SUB (β-1) to main shaft movement amount MAIN (β-2) and slave shaft movement amount SUB (β-2). The same is true at time t6 shown in FIG. The data pair selected and output from the multiplexer 342 is converted from the spindle movement amount MAIN (β-2) and the slave shaft movement amount SUB (β-2) to the spindle movement amount MAIN (β-3) and the slave shaft movement amount SUB (β− Change to 3).

  Thereafter, when the direction signal d changes from L level to H level at time t7, the up / down counter 311 counts up every time the clock signal c is input, and when the up / down counter 311 overflows, the data switching direction signal j is It changes from L level to H level. The data pair selected and output from the multiplexer 342 is converted from the main shaft movement amount MAIN (β-3) and the sub shaft movement amount SUB (β-3) to the main shaft movement amount MAIN (β-2) and the sub shaft movement amount SUB (β−. Change to 2). The subsequent operation is exactly the same as described above.

  When such an electronic cam controller A is used, even if the main shaft 1 hunts when the rotation of the main shaft 1 is stopped, an error does not occur in the advance amount of the slave shaft 2 with respect to the advance amount of the main shaft 1. Along with this, the positioning accuracy of slave shaft control is not lowered. Moreover, since it has a very simple configuration, it is possible to reduce costs and improve performance.

  Next, a modification of the electronic cam controller A will be described with reference to FIG. In this modification, an input unit 36, a cam curve data memory unit 37, and a cam curve data management unit 38 shown in FIG. 7 are added to the configuration of the frequency division ratio control unit 30 shown in FIG.

  However, the data control unit 341 of the frequency division ratio control unit 30 is slightly different from the above. That is, in addition to the function of creating the data selection signal q based on the data switching signal i and the data switching direction signal j, the data control unit 341 selects the final data of the cam curve data K from the memory unit 32. A cam data request signal m indicating the above. The final data of the cam curve data K referred to here is a data pair of the main shaft movement amount MAIN (β) and the sub shaft movement amount SUB (β) when the data switching direction signal j is at the H level. When j is at the L level, it indicates a data pair of the spindle movement amount MAIN (1) and the slave axis movement amount SUB (1).

  In the cam curve data memory unit 37, n types of cam curve data K1, K2,... Kn are stored in advance. The cam curve data K1 includes, in addition to the data pair of the main shaft movement amount MAIN (n) and the slave shaft movement amount SUB (n) indicating the cam shape, the specific information of the cam shape, the number of the data pairs, the memory of the data pair Contains information such as addresses. The same applies to the cam curve data K2... Kn.

  The input unit 36 is an external signal input terminal or a switch for switching the cam operation. Specifically, cam shape specification information (information specifying one of the cam curve data K1, K2,... Kn), order (order of reading the specified cam curve data K1, etc.), and the number of times Sequence data indicating (the number of repetitions of the basic cam operation to be realized) or the like can be input, and the input sequence data is output as the cam switching signal p.

  The cam curve data management unit 38 is a circuit unit that has both a data reproduction circuit for the cam curve data memory unit 37 and a data recording circuit for the memory unit 32. That is, the cam curve data K1, K2,... Kn in the cam curve data storage unit 37 are read as indicated by the sequence data related to the cam switching signal p input through the input unit 36, and the cam curve data K1 and the like are read out as cam data. The data is transferred to the memory unit 32 through the data bus n at the timing indicated by the request signal m, and the recorded contents on the memory unit 32 are updated.

  In the case of this modification, when sequence data is input through the input unit 36, the recorded contents of the memory unit 32 are updated at any time as indicated by the sequence data, so that the realized cam operation can be continued without stopping. Can be changed. Therefore, not only the work efficiency is improved, but the range of use can be expanded.

Note that the electronic cam controller according to the present invention is not limited to the above embodiments in terms of the types of the main shaft and the sub shaft mechanism, the number of sub shafts, the type of drive motor, the type of main shaft encoder, and the like. When the direction signal is included in the output signal of the spindle encoder, this direction signal may be used. The functions of the frequency division ratio control unit and the like may be realized using a microcomputer.

  In particular, as long as the signal generation unit has at least the function of generating a clock signal necessary for generating the slave axis pulse, the output form and the multiplication ratio are not limited, and the spindle pulse output from the spindle encoder is directly clocked. The form utilized as a signal may be sufficient.

  As the memory unit, a general memory may be used, and the cam curve data may be read according to the switching unit or the data control unit. The cam curve data may have any content as long as the relationship between the spindle movement amount and the slave shaft movement amount is directly or indirectly shown. For example, the cam curve data includes the spindle movement amount and the slave shaft speed relative to the spindle speed. In the case of a data pair with the speed ratio, if the calculation of the slave axis movement amount (master axis movement amount × speed ratio of the slave shaft speed to the spindle speed) is performed, the data pair of the master axis movement amount and the slave axis movement amount is obtained. It is possible to convert. In addition, in the case of a data pair with each section (section of each movement amount of the main shaft / slave shaft) and the type of cam curve (sine, cycloid, cam curve, etc.) used in the section, an arithmetic expression representing the cam curve is given. It is also possible to convert into a data pair of the main axis movement amount and the sub axis movement amount by the calculation used. The same applies to the cam curve data memory unit. That is, the cam curve data recorded in the cam curve data memory unit may be read by the cam curve data management unit and converted into a data pair of the main shaft movement amount and the slave shaft movement amount.

  As for the switching unit, as long as it has a function of sequentially selecting and outputting the cam curve data on the memory unit at the timing indicated by the data switching signal while switching the direction indicated by the data switching direction signal, the switching unit is appropriately selected according to the memory unit and the switching unit. Change the design.

  For the timing control unit, when the data switching signal becomes active, the subsequent clock signal is counted in the direction indicated by the direction signal, and the timing at which this count value is changed by the amount of spindle movement output from the switching unit is switched to data. As long as it has a function of generating a data switching direction signal whose direction is reversed at the timing when the data switching signal is first activated immediately after the direction signal is changed, the design may be changed as appropriate.

  As for the frequency division ratio adjustment unit, as long as it has a function of changing the frequency division ratio of the slave shaft pulse generation unit based on the ratio of the main shaft movement amount and the sub shaft movement amount included in the cam curve data output from the switching unit. The design may be changed as appropriate.

A Electronic cam controller 10 Signal generation unit 20 Slave shaft pulse generation unit 30 Division ratio control unit 31 Timing control unit 311 Up / down counter
312 Signal output unit
32 Memory part
K cam curve data 34 switching unit 35 division ratio adjusting unit 36 input unit 37 cam curve data memory unit 38 cam curve data management unit B driver 1 main shaft 2 slave shaft 3 stepping motor (stepping motor for main shaft)
4 Encoder (Spindle encoder)
5 Stepping motor (Stepping motor for slave shaft)

Claims (2)

  A signal generator that generates at least a clock signal based on the spindle pulse of the spindle encoder, and counts the clock signal in the direction indicated by the direction signal to divide the frequency so that the variable division ratio can be controlled. A slave-axis pulse generator that outputs a slave-axis pulse that is synchronized with the signal, and a frequency-dividing ratio controller that controls the frequency-dividing ratio of the slave-axis pulse generator based on the clock signal and the direction signal. A timing control unit that generates a data switching signal and a data switching direction signal based on the clock signal and the direction signal, and cam curve data that represents a cam curve using a relationship between a main shaft movement amount and a slave shaft movement amount Is stored in advance, and the timing indicated by the data switching signal while switching the direction indicated by the data switching direction signal of the cam curve data on the memory unit. The frequency dividing ratio of the slave pulse generator is changed based on a switching unit that sequentially selects and outputs, and a ratio between the main shaft movement amount and the sub shaft movement amount included in the cam curve data output from the switching unit. A division ratio adjusting unit, and the timing control unit counts the subsequent clock signal in a direction indicated by the direction signal when the data switching signal becomes active, and the count value is the switching Data switching that outputs the timing changed by the amount of spindle movement output from the unit as a data switching signal, while the direction is reversed at the timing when the data switching signal is first activated immediately after the direction signal is changed An electronic cam controller, comprising: a signal output unit that outputs a direction signal.   The electronic cam controller according to claim 1, wherein the switching unit has a function of generating a cam data request signal indicating that the final data included in the cam curve data is selected and output from the memory unit. Of the cam curve data on the cam curve data storage unit, a cam curve data storage unit in which a plurality of types of cam curve data are stored in advance, an input unit to which cam switching information for switching the type of cam curve is input, A cam data management unit that reads out cam curve data corresponding to the cam switching information input through the input unit, transfers the cam curve data to the memory unit at a timing indicated by a cam data request signal, and updates the storage content of the memory unit; An electronic cam controller characterized by

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