JPS6110221Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a timer device for an injection molding machine.

It is well known that various timers are used in injection molding machines to determine molding conditions for molded products and to operate mechanical devices in automatic cycles. However, in the conventional time management of sequence operations that determine the above-mentioned molding conditions, a certain set time is simply specified at the design stage, and it is not necessary to actually assemble the injection molding machine and perform the same operation using its sequence control device. When testing a machine, it does not necessarily follow that the time settings at the design stage are completely appropriate. This is because the machine has a complex combination of various hydraulic circuit piping and functional parts (pulses, moving bodies, etc.), and therefore, when observed in detail over time, each injection molding machine is completely This is because it cannot be expected to perform the same sequential operations. This means that when several machines are driven by the same sequence control device, the molding conditions unique to each machine will be reflected in the molded product. As public demands for molded products have become more sophisticated, more attention has been paid to these problems with respect to the time management of each injection molding machine and its sequence of operations.

Currently, a stop watch is used to measure the time of each sequence operation, and a so-called adjustment operation is performed in which an operator corrects the set time at the design stage by measuring the optimal operation time. However, when measuring time using a stopwatch, there is an individual error of the operator, and if the operator is not familiar with the contents of the sequence operation, it is difficult to determine the optimal state in time measurement. Furthermore, conventionally cheap analog timers have been used for timer devices in sequence control devices, but these utilize CR charging/discharging circuits and are used for relatively short time settings, and their output However, in most of the timer devices, the digital timer section and the analog timer section are not organically connected (for example, due to inconsistency in the logic level), so it is inconvenient to adjust the set time of the analog timer. It was also difficult to improve the accuracy.

The present invention is intended to eliminate the drawbacks of the conventional timer device for injection molding machines as described above, and its purpose is to centralize the digitized timer and analog timer in one place, and to Another object of the present invention is to provide a hybrid timer for an injection molding machine in which a part having an elapsed time display function for performing a stopwatch function is added and these parts are incorporated into one unit. An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, a portion 1 surrounded by a dashed line indicates a hybrid timer. Reference numeral 2 denotes a power supply section which supplies DC power to the IC and transistor circuits necessary for this device and also generates a clock pulse CP which constitutes the basic unit time in the operation of the timer. The clock pulse CP has a pulse frequency of 50 Hz or 60 Hz synchronized with the cycle of the AC power supply S. 10 is a switching circuit and can be manually set to 50
It is possible to select between Hz and 60Hz, and it also includes a frequency dividing circuit that divides these pulse needle numbers into a predetermined ratio.
Two output lines l ₃ and l ₄ from the circuit 10 are connected to counter 3 and counter 7, respectively.
Output line _l3 is given 10Hz (period of 0.1 seconds) divided by the frequency divider circuit, and output line _l4 is given 10Hz (period of 0.1 seconds) or 1Hz (period of 1 second). ing. In this case, the above 1Hz is a specific signal line.
Only when there is input on l ₆ . (The details will be described later.) 3 is a counter whose input signal line _l2 is adapted to transmit the start of sequence operation of the injection molding machine to the counter 3. In FIG. 1, a push button switch 15 is used to command the start, but this is not necessarily limited to a push button switch. Reference numeral 4 denotes a changeover switch that allows the count value of either the counter 3 or 7 to be selected by a terminal 4a, and the gate 5 provides the output of the changeover switch 4, that is, the count value of the counter 3 or counter 7, to the display circuit 8, and also serves as a push button switch. A signal line _l1 from 16 is input, and the count value at the time the push button switch 16 is pressed is held in the display circuit 8. That is, the display circuit 8, the gate 5, and the push button switch 16 constitute a stopwatch circuit. In this case, another control signal α may be connected in place of the push button switch 16, and the gate 5 may be automatically operated by the same control signal α. The sequence signal D is shown in the lower left of Figure 1.
{D1,...Di...DN} and A{A1,...Ai...AN} are the D part and A of the terminal block 11 in the hybrid timer 1
are entered in each section. Here, the initials D and A are a kind of index for distinguishing whether the timer through which each sequence signal passes is Digital or Analog, as will be described later. Sequence signal D {D1,...DN} is connected to terminal block D
The signal is sent to the input circuit 9 through the section. During one sequence operation, one of the sequence signals D1 . . . , DN corresponds to the output line _l5 of the input circuit 9. Numeral 6 is a daisy switch that can digitally set the delay time (timer set time) until each of the above sequence signals D1,...ND appears as outputs d1,...dN to setting terminals TD1 to TDN, respectively. compares the count value of counter 7 with the corresponding setting value of the daisy switch.
This is the detection line to be monitored. Reference numeral 14 denotes a flip-flop output circuit, which is set by the count-up signals C and UP of the counter 7 and outputs the respective sequence signals d1, . . . dN.

Note that a signal line _l6 is provided from the top output line (corresponding to the sequence signal D1) of the terminal block D section (corresponding to the sequence signal D1) to the switching circuit 10. ..., 10 compared to DN
Used when the size is about twice as large. That is, when the sequence signal D1 is applied, the clock pulse CP of one second period appears on the output line _l4 of the switching circuit 10 as described above.

Also, the sequence signal A1,...,AN is connected to the terminal block A section.
is entered. These signals A1...AN are outputted as output sequence signals a1,...aN via analog timers 12a,...13a each composed of an IC and a transistor. The analog timers 12a, 13a have resistors 12b, 13b for setting time-up times, and various delay times can be set by adjusting these resistors.

Next, the operational functions of the hybrid timer shown in FIG. 1 will be explained.

While the clock pulse CP is being applied from the power supply section 2, turn the terminal 4a of the changeover switch 4 upwards, and when a sequence start signal appears on the output line _L3 , the counter 3 starts counting the pulses on the output line _L3 . . The count value of the counter 3 is sequentially sent to the display circuit 8 via the gate 5. If you want to know the elapsed time from the start of the sequence operation of the injection molding machine at a certain point, press the push button switch 16.
When the button is pressed, the count value at the same time is displayed on the display circuit 8. Further, by tilting the terminal 4a of the changeover switch downward, the counted value of the counter 7 is sequentially sent to the display circuit 8. Each setting terminal of daisy switch 6
Each sequence signal D1,..., TDN is connected to TD1,..., TDN.
Assume that the DN setting time is set. A command to start counting is given to the output line _l5 of the input circuit 9, where the sequence signal (for example, Di) arrives, and the counter 7 performs counting. When the counted value matches the value set at the setting terminal TDi, the count up signal C.UP is generated, the flip-flop circuit 14 is set, and the corresponding output sequence signal di is generated. Further, if the push button switch 16 is pressed at a certain point during counting by the counter 7 based on the sequence signal Di, the push button switch 16 is pressed after the sequence signal Di arrives at the display circuit 8.
The elapsed time until you press is displayed.

Furthermore, when a sequence signal (for example, A1) is given to an analog timer, the output of the corresponding analog timer 12a becomes an output sequence signal a1 after a set time (the time required for the charging/discharging voltage to reach a certain value (referred to as a logic level)). emits. Each sequence signal D1~DN, A1~ mentioned above
AN, d1 to dN, and a1 to aN are all unified to the same logic level (voltage 5 volts or 0 volts).

Next, the features and effects of the present invention will be described.

(a) In the present invention, the digital timer and analog timer are combined into one unit, and the analog timer is also made into an IC transistor, so the power supply for these can be shared and the wiring can be simplified.

(b) In this invention, since the logic level of the analog timer and the digital timer is common, mutual exchange of sequence signals is possible, for example, the output sequence signal a1 of the analog timer.
The input sequence signal of the digitized timer
Connecting to D1 or vice versa can be easily handled within this timer.

(c) Since the digital part and the analog part are constructed at the same logic level, the digital timer can be easily used to adjust the timing of the analog timer.

(d) In this device, the counter 3 counts the time elapsed for all sequence operations and displays it sequentially on the display circuit, so when it is necessary to know the time from the start of operation of the injection molding machine to a certain operating state, the signal line _l1 to the gate 5 is connected, so that the time can be known by operating the push button switch 16. In other words, it has a stopwatch function.

(e) Similarly to (d) above, the stopwatch function can be activated even during the operation of one sequence of each sequence signal.

(F) Equipped with a stopwatch circuit, the injection timing of the injection molding machine, the determination of operating conditions for the molded product, etc. can be clarified in terms of time, making it easy to rationally manage each sequence operation of the injection molding machine. becomes possible.

[Brief explanation of the drawing]

FIG. 1 shows a circuit diagram of a hybrid timer according to the present invention. 1...Hybrid timer, 2...Power supply section,
3... Counter, 4... Changeover switch, 5... Gate, 6... Daisy switch, 7... Counter, 8... Display circuit, 9... Input circuit, 10...
Switching circuit, 11...terminal block, 12a, 13a...
Analog timer, 12b, 13b...setting section,
14...Flip-flop circuit.

Claims (1)

[Claims for Utility Model Registration] A timer device for an injection molding machine having an analog timer and a digital timer, a first counter that counts the elapsed time of all sequence operations, and a second counter that counts the elapsed time of each sequence operation. a counter; a plurality of daisy switches connected to the second counter and setting each operation time;
An input circuit that specifies one of the sequence operations for the second counter and also provides a counting start command signal to the second counter, a flip-flop circuit that is set by the count-up signal of the second counter, and a flip-flop circuit that is synchronized with the commercial AC signal. a digital timer section including a switching means including a frequency dividing circuit that forms a pulse signal and divides the frequency of the pulse signal to form a pulse signal with a longer period than the pulse signal; and the first and second counters. a display circuit that displays the counting state of the display circuit; a stopwatch circuit that maintains the contents of the display circuit in a constant state; A hybrid timer for injection molding machines that is formed as one unit with two analog timer parts.