JPS58196481A - Hand display stopwatch - Google Patents

Abstract

PURPOSE:To obtain hand display stopwatch enabled in split display and capable of starting measurement during the return of hand, by outputting a motor drive signal in a cycle faster than a reference signal by a gate circuit when it is judged by a coincidence circuit that the contents of a latch circuit and the hand position counter are not coincided. CONSTITUTION:When the coincidence of a latch circuit 9 and a hand position counter 11 is released and a coincidence signal Ye outputted from a coincidence circuit 10 comes to ''L'', a quick sending signal phis is certainly outputted from a gate circuit 12 and hand 16 is quickly sent at 16Hz. Therefore, when the position of the hand is not coincided with a measuring time, a step motor is driven in a cycle faster than a reference signal until the position of the hand comes up with the measuring time. By the constitution as mentioned above, even in hand display stopwatch for displaying hand by a step motor, split display and start during the return of the hand are enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for driving a pointer in a pointer display stopwatch in which the pointer is displayed by a step motor.

In recent years, there has been a rapid increase in market demand for crystal oscillation type pointer display stopwatches that can intuitively detect and accurately measure time. However, in a crystal oscillation type pointer display stopwatch, the pointer must be driven by a step motor and a wheel train linked to the step motor. Therefore, unlike digital systems, the display cannot be changed instantaneously, so it was impossible to incorporate a split function that allows measurement to continue but the display to temporarily stop. Furthermore, for the same reason, it was not possible to start measurement again during the second stitch.

The present invention eliminates such drawbacks, and its purpose is to provide a pointer display stopwatch that has not been commercialized in the past, which is capable of split display and can also start measurement midway through the rear hand.

Hereinafter, the present invention will be described in detail based on Examples.

FIG. 1 is a block diagram showing one embodiment of the present invention. In Figure 1, 1 is an oscillation circuit that oscillates at 32768 Hz using a crystal oscillator as the source, and 2 is a frequency division and waveform shaping circuit that sequentially divides the signal generated in oscillation circuit 1 and performs stopwatch measurement. The reference signal φOL required for
It also forms a fast-forward signal φB for driving the slap motor when releasing the split and when the second hand is moving, as well as signals necessary for other circuits. In this example, φ(IL is I
The 4th day is a 16 Hz differential signal.

3 and 4 are external operating members. A control circuit 5 outputs a start/stop signal st, a reset signal R8, and a split signal BP by a combination of operations 3 and 4. Although explanations are omitted here, various combinations of operations 3 and 4 are possible. Further, in addition to 3 and 4, an external operating member may be provided.

Reference numeral 6 denotes a switch controlled by the start Φ stop signal St, which closes and starts measurement when the start/stop signal is 1lH1l. 7 is a step motor drive circuit according to the present embodiment, which includes a sexagesimal time counter 8 that counts the reference signal φOL, and a latch circuit that normally passes the contents of the time counter 8 and holds it when the split signal BP becomes "H". 9. A sexagesimal needle position counter 11 that counts the motor drive signal φM; a matching circuit 10 that detects whether the latch circuit 9 and the needle position counter 11 match;
- The gate circuit 12 selects the reference signal φOY- and the fast-forward signal 4 days as the motor drive signal φM based on the match signal Ye output from the number circuit 10 and the split signal Sp output from the control circuit 5. Mo-
It is composed of a drive pulse shaping circuit that converts the data into a data drive pulse pM. 14 is a step motor driven by a drive pulse pM. 15 is a wheel train that is interlocked with the step motor 14 and drives the pointer 16.

In this embodiment, the pointer 16 is configured to rotate once in 60 steps by the wheel train 15.

When the external operation member 3 is operated while the stopwatch display is in the reset state, the start/stop signal St becomes "H", the switch 6 is closed, and the 1Hz reference signal φO is activated.
L is input to the time counter 8 and gate circuit 12, and measurement is started. At this time, the gate circuit 12 outputs the motor drive signal φ
Reference signal φC as M! - is selected and output, the IHz motor drive pulse pM is output from the drive pulse shaping circuit 13, the pointer 16 moves in steps of 1 second, and φ
Since M is input to the hand position counter 11, the contents of the hand position counter 11 and the contents of the latch circuit 9, which passes the contents of the time counter 8, match. In this state, when the external operating member 4 is operated and the split signal Sp becomes H'', a split time display state is entered, the contents of the latch circuit 9 are held, the output from the gate circuit 12 disappears, and the pointer 16 stops. At this time, since there is no input to the needle position counter 11, the contents of the latch circuit 9 and the needle position counter 11 remain the same, so the gate circuit 12 converts the fast-forward signal φB into the motor drive signal φV.
Do not select as Next, when the external operating member 4 is operated again to cancel the split display state, the split signal sp becomes "L" and the latch circuit 9 passes the contents of the time counter 8, so the contents of the latch circuit 9 and the hand position are The contents of the counter 11 are different, the coincidence signal Ye output from the minus number circuit 10 becomes 'L', and the gate circuit 12 selects the fast forward signal 4 days as the motor drive signal φM.

As a result, the pointer 16 is fast-forwarded at 16 Hz until the content of the hand position counter 11 matches the content of the latch circuit 9 and the match signal Ye becomes "IIH".
When the signal becomes H'', the gate circuit 12 again selects the reference signal φOT- as the motor drive signal φM, and the pointer 16 moves in steps of 1 second.

When the stopwatch is reset by operating the external operating member 4 after the measurement is completed, the reset signal becomes "H" and the content of the time counter 8 becomes 0, so the coincidence signal Ye
becomes "L", and the gate circuit 12 selects the fast-forward signal φB as the motor drive signal φM.As a result, the pointer 16 fast-forwards at 16 Hz until the content of the needle position counter 11 becomes 0 and the coincidence signal Ye becomes @H#. This concludes the explanation of FIG.

Next, FIG. 2 shows a specific configuration example of the step motor drive circuit 7 of this embodiment. In Figure 2, 17, 18, 19,
20, 21, 22, and 23 are master-slave type 7 lip-flops with a reset terminal (hereinafter 7. ).

Also 52.55, 34.35.56.37, 38 are o
It is a latch that passes data when the clock input to the p terminal is IIH' and holds it when it is L''.
39, 40, 41.42, 44゜45.46 are KXOL
USIV'F: ``H'' when the inputs match at the NOR gate
become. Also, 49 is a master-slave type F, in which the Q and page change at the rising edge of the clock input to the CP terminal. It is. Also, 31゜50.51, 52 are inverters, 24, 27
゜55.56 is an OR gate, 25, 28 is a NAND (7
) Game), 26, 29 is NOR gate, 30, 43.47
．． 48.53.54.57 are AND gates. This concludes the explanation of each element in FIG. 2, and next the operation of FIG. 2 will be explained.

A reference signal φB, which is an IHz differential signal formed by the branch and waveform shaping circuit 2 shown in FIG. 1, is input to the terminal. A reset signal R day is input to the terminal. terminal worker,
A fast forward signal φB, which is a 16 Hz differential signal, is input to the input signal φB. A split signal Sp is input to the terminal I4. For terminal work, 128H controls the timing of matching detection.
A differential signal WR of z is input. Terminal worker. A signal Bz for storing the zero position of the hand is input to the hand position counter 11. A motor drive signal φM is output from the terminal 01 and is connected to the drive pulse shaping circuit 13 shown in FIG.

:.

Timing counter 8 has 7 F・Fi7,18°19.2
0, 21, 22, 23 and 9 gates 24, 25, 26
, 56, 57, 27, 2B, 29°30. The hand position counter 11 has exactly the same structure as the time counter 8. The latch circuit 9 is composed of seven latches 32, 55, 34, 35, 36, 37, 3B, and the contents α1, . β1
, γ1. δ1, α10+β+Osγ, 0 are passed when the split signal Sp is IIL", and held when it is llH". -The number circuit 10 is 7 (7) JCX
(!LUSIVENOR'r'-)39,40,41
．． 42, 44, 45. 46 and ANDNO gate, 47
, 48 and 7/1F49, IF-749
This ensures accurate match detection. Gate circuit 12
is composed of an inverter 51 and gates) 53, 54.55, and the coincidence signal Ye is @H' and the split signal Sp
When is @H”, the reference signal φOL is used as the motor drive signal φM
When the match signal Ye is L'', the fast forward signal φ8 is selected as the motor drive signal φM. That is,
The latch circuit 9 and the needle position counter 11 do not match,
When the coincidence signal Ye output from the -number circuit 10 becomes L1, the fast forward signal φ day is always output from the gate circuit 12, and the pointer 16 is fast forwarded by 16H2.

Therefore, the position of the pointer (the contents of the needle position counter), such as when the split is released and the measurement is started during the second needle.
When the measured time (contents of the latch circuit) do not match, the step motor is driven at a frequency faster than the reference signal until the position of the pointer catches up with the measured time. With the above configuration, even in a pointer display stopwatch which uses a step motor to display the pointer, it is possible to perform split display and start during the second hand.

Note that the pointer display stopwatch according to this embodiment operates normally even if the gate circuit 12 does not include the gates 54 and 55. In other words, the gate 53 that selects the fast forward signal φS
Even if the gate circuit 12 is configured with only one pass through φB, if the content of the time counter 8 is incremented by 1 by the reference signal φOL, the latch circuit 9 and the hand position counter 11 will not match, and the gate 53 will pass through φB only once. Above is the reference signal φ
This is similar to driving a step motor with OT-.

Further, in this embodiment, the case where the digit of one second is indicated has been described, but the present invention can also be applied to the case where the digit of one minute or one hour is indicated. Further, in this embodiment, the case where the pointer makes one revolution in 60 steps is given as an example, but the number of steps in one revolution can be easily changed by changing the configuration of the wheel train 16, time counter 8, hand position counter 11, etc. be able to.

As described above, the present invention is capable of split display, can start measurement even in the middle of the second hand, and can be operated in the same way as a digital display stopwatch, which can measure - and third place times at the same time. This has the excellent effect of providing a pointer display stopwatch.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a specific example of the configuration of a step motor drive circuit according to the present invention. 1... Oscillation circuit 2... Frequency division and waveform shaping circuit 3.4... External operation member 5... Control circuit 6... Switch 7...Step motor drive circuit 8...
Timing counter 9... Latch circuit 10... Coincidence circuit 11... Hand position counter 12... Gate circuit 13... Drive pulse shaping circuit 14... ...Step motor 15 ... Gear train 16 ... Guideline or above Applicant Suwa Seikosha Co., Ltd. Agent Patent attorney Tsutomu Mogami

Claims (1)

[Claims] (1) In a pointer display stopwatch whose pointer is displayed by a step motor, a time counter that counts a reference signal, a latch circuit that passes and holds the contents of the time counter, a hand position counter that memorizes the display position of the pointer, and A matching circuit between the latch circuit and the needle position counter, and a gate circuit that selects a motor drive signal with a higher frequency than the reference signal when it is judged by the -number circuit that the contents of the latch circuit and the needle position counter do not match. What is claimed is: 1. A pointer display stopwatch characterized by having a step motor drive circuit.