JPS60238990A - Counting device - Google Patents

Abstract

PURPOSE:To prevent an error in counting due to chattering by providing the counting device with two storage circuits composed of flip-flop circuits and an erroneous counting preventing circuit composed of a timer and a logical circuit in combination. CONSTITUTION:When conveying facilities 1 start, a flip-flop FF12 is set by a pulse generator PLG11 to allow the signal of a detector S1 to be inputted to the set input of an FF13. When the detector S1 detects a conveyed body 2, the FF13 is set and an FF14 is reset to allow a counter 10 to count up through an OR gate 23. At the same time, a timer 15 is set and starts to generate an H-level output for the time set according to conveyance pitch; and the FF13 and FF14 are held set and reset respectively. Further, the on signal of the detector S1 is inputted to an AND gate 17 and inhibited from satisfying OR requirements at an OR gate 22, so that the counting operation is not performed up to the time when the next conveyed body is expected to be detected.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a method of detecting the passage of a conveyed object by a detector [7] and counting the detection signal in a conveyance equipment that carries out regular pitching feeding or conveyance at a regular speed. This relates to a counting device that counts Y number of conveyances.

[Prior art]

Conventionally, as this type of device, there has been a counting device as shown in FIG. 3 in the elaborate conveyance equipment shown in FIG. In the figure, (1) is the conveyance equipment, [2) ~
(4) is the object to be transported % (SI) is a detector that detects the object to be transported, (10) is a counter that counts the ON signal of the detector (SI), and (16) is an AND gate.

Next, the [phase] operation of the above device will be explained. The objects to be conveyed (21, (31, etc.) are placed on a mounting table arranged at a constant pitch on the conveyance equipment (1) consisting of a belt conveyor, etc., and are conveyed sequentially at a regular pitch or speed. During this transportation, the objects to be transported (21, (31, . . . The ON signal enters the AND game (16) together with the forward signal that becomes H level when the transport equipment (1) is driven, and its A
When the ND condition is met, the counter (10) counts up by Yl.

In such a configuration, the transported objects [21, (3+,
... is caused by vibrations of the transport equipment (1), etc.

Due to this backlash, a slight movement occurs in the detection correlation position with respect to the ERI detector (SI), and the output of the detector (SI) contains a charring signal that repeatedly turns on and off. Therefore, the counter (1o) also counts this chatter signal, causing a problem that an error occurs between the number of conveyances and the count value.

[Summary of the invention]

This invention was made to eliminate the drawbacks of the above-mentioned conventional devices, and includes a counting device equipped with an erroneous counting prevention circuit that is combined through a logic circuit such as two memory circuits and a timer, and detects a detection signal. To provide a counting device which can prevent incorrect counting by blocking chatter signals contained in the data.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIG. 1 with reference to FIG. 2. In FIG. 1, (11) is a pulse generator PLS, (121, (13), (14)) that generates a pulse signal according to the conveyance pitch of the conveyance equipment (1).
(15) is a timer device, (17) to (20) are AND gates, (21) is a memory circuit made of a flip-flop circuit;
) to (23) are OR, gate, ZE is counter (10)
This is a level signal that is output when the count reaches zero or the set count value is completed.

Next, how does the counting device according to this invention work? explain.

The objects to be conveyed (21, r31... are conveyed by the conveyance equipment (11) at regular pitches, so after being detected by the detector (SI), it must be carried out only after a time corresponding to the conveyance pitch. , the next conveyed object cannot be detected.

First, when the conveyance equipment (1) is driven and starts at t''+, the pulse signal generated by the PLG (11) according to the conveyance pitch causes the flip-flop circuit (12) to switch to SET 1.
is set, and with this set output, input of the signal of the detector (Sl) to the flip-flop circuit (13) (>) SET A1 becomes OK. Then, when the detector (Sl) detects the transported object (2), the 711717071 circuit (13
) is set to 5ETAI, the flip-flop circuit (14) is set to Vl+, and the counter (10) is counted up by one via the OR gate) <25]. At the same time, the timer (15) is set and started, and until the time-up time is set manually according to the conveyance pitch or automatically according to the conveyance speed, ■
■Level signal is output. The flip-flop circuit (13) is reset by this output, and the 711717071
Circuit (14)0)5ETA2 is set and held at time-up. Furthermore, AND gate (1
7) is input, te, OR, game) The establishment of the ON condition with the ON signal of the detector (Sl) in (22) is prevented, and the primary conveyed object (3) is detected by the detector (Sl). Until the time-up time (when the sensor reaches the position of
The on signal is 0'R, Ge) (22)? false counting in the counter (10) is prevented.

After the timer (15) times up, the counter (10) can count up when the detection signal for the next conveyed object (3) is turned on. In this way, the detector (Sl)
The chattering signal included in the detection signal is blocked.

In the above embodiment, a circuit for preventing erroneous counting of a counting device in a conveyance facility that feeds regular pitches has been described, but the present invention is not limited to this embodiment.

Even in the detection of mechanical movements that occur reliably over time,
By providing the erroneous count prevention circuit according to the present invention, erroneous detection can be similarly prevented.

〔Effect of the invention〕

As explained above, the counting device according to the present invention is provided with an erroneous count prevention circuit that combines two memory circuits made of flip-flop circuits and a timer via a logic circuit, and is equipped with a counter circuit that prevents chattering contained in a detection signal. Since the counter is configured to block the number of objects to be transported, even if chattering occurs due to looseness of the transported objects, erroneous counting is reliably prevented, and the counter can always accurately count the number of transported objects.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a counting device having an erroneous counting prevention circuit according to the present invention, FIG. 2 is a block diagram of a transport facility, objects to be transported, and a detector, and FIG. 3 is a block diagram of a conventional counting device. (1)...Transfer equipment, (2)-(4)...Transferred object, (81)...Detector, (10)...Counter,
(11)...Pulse generator, (12)-(14)-
... Flip-flop circuit, (15) ... Timer device % (16) - (20) ... AND gate, (21
)~(23)...OR. Gate. Note that the same reference numerals in the figures indicate the same or corresponding parts 4. Agent Patent Attorney Sanro Kimura

Claims (1)

[Claims] Is the object to be conveyed by regular pitch feeding? In a device that detects with a detector and counts the number of conveyances based on the detection signal, an erroneous count prevention circuit that combines two memory circuits and a timer via a logic circuit is provided, and a chattering signal included in the output of the detector is installed. A counting device characterized by blocking and preventing erroneous counting.