JPS5940121A - Scaling device - Google Patents

Abstract

PURPOSE:To hold measurement precision invariably high, by lowering a body to be measured according to the inclination of a conveyor pawl, and mounting the body to be measured on a conveyor belt and moving it in a floating state over the conveyor pawl. CONSTITUTION:When the conveyor pawl 3 mounting a work W passes on a scale table 5, scaling is carried out before and after the work W is mounted and signals of both measured values are inputted to a control device. Then, the weight difference between both measured values is sorted on the basis of specific weight section stages and a discharge shoot 9 is commanded to lower the tip of a pawl plate 3a according to the selected stage. Consequently, the conveyor pawl 3 mounting the work W again by passing through a scale device 4 drops the work W on the selected discharge shoot 9 from above and the work is discharged to the side of the conveyor 2. Thus, since the measurement is taken by utilizing the weight difference, the weight of the conveyor belt 3 as a conveyor container does not relate to the measurement precision.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weighing device mainly used in automatic weight sorting machines for irregularly shaped items such as marine products and agricultural products.

In the conventional structure of this type of automatic sorting machine, the object to be weighed (
A workpiece (hereinafter referred to as a workpiece) is placed in a packet as a transportation container, and during transportation, the entire packet is weighed using a scale.The weight is divided into weight classification stages, and each workpiece is separated from the packet into seven stages. Previously, the conventional method of transporting packets was
・In this case, variations in the weight of the packets directly result in measurement errors, so there is the hassle of having to standardize the weight of the packets, and the weight of dirt that adheres to the packets during work causes errors. The drawback was that highly accurate measurements could not be expected.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a weighing device that can perform zero correction at each weighing time.

As a means to achieve that objective, the weighing device of the present invention includes:
A transport claw that is driven by a conveyor and moves horizontally at a constant speed, and is equipped with a large number of claw plates arranged intermittently in parallel within the width line, and a transport claw that is suspended on the transport path of the transport claw. A transfer belt that is held and moves horizontally at approximately constant speed (within a range that does not exceed the conveyor speed), and is composed of a plurality of belt bands that are intermittently parallel to the claw plate and the erroneous position within the width line. A weighing device is equipped with a weighing device using a transfer belt as a weighing platform, and during the weighing operation in which the transfer claw moves on the weighing platform, the object to be weighed placed on and conveyed on the transfer claw is moved by the tilting of the transfer claw. The object to be weighed is transferred to the transfer belt and moved along the transfer claw while floating above the transfer claw.

The present invention will be described below based on an illustrated embodiment.

In the automatic sorting machine equipped with the weighing device 1 of the embodiment,
As shown in FIGS. 1 to 3, while the work W is being conveyed while being placed on the pawl plates 33 of a large number of plow-shaped conveying pawls 3 attached to the chain conveyor 2 at regular intervals, A method is adopted in which the weight is measured when passing through a weighing platform 5 suspended from a weighing device 4, and the chain conveyor 2 is operated by a motor 6.
A hook is rotated between the drive sprocket 7, which is driven by the sprocket 7, and the other driven sprocket 8, and rotates at a constant speed.

Therefore, on the downstream side of the weighing device 4, that is, below the conveyor 2 on the right side of the drawing, a plurality of discharge chutes 9, each consisting of a receiving plate tilted diagonally downward in the width direction (open phase a), are arranged in a row. The workpieces W sequentially fed onto the conveyor 2 from the workpiece feeder 10 are conveyed to the conveyance claw 3 and passed through the weighing platform 5, after which they are selectively discharged to the discharge chute 9 for each weight classification stage. There are many people.

By the way, each conveyance claw 3 is connected to the idle roller 12 of the passive arm 11 which is pivoted to one end of the base shaft 3b which is supported by the conveyor 2. By being guided by the cam groove 13a and driven in the vertical direction, the swing angle is regulated as follows in accordance with the movement position.

(a) At the position of the earth flow from the scale 4, the claw plate 3
The tip of a is raised at a swinging angle.

(b) At the position where the scale 4 is being passed, the claw plate 3
It forms an oscillating inclination with a being horizontal.

(C) At the position downstream from the weighing device 4, the tip of the claw plate 3a maintains a slightly raised swinging angle, but according to a command from a controller (not shown), the upper position of the selected discharge chute 9 is determined. At the point in time when the tip of the claw plate 3a is lowered, the tilting angle shifts to a tilt angle in which the tip of the claw plate 3a is lowered.

Next, the scale stand 5 suspended from the scale 4 has a claw plate 3a.
and double-row belt belt 14 arranged on the width line at the wrong position.
A transfer belt 14 consisting of a is arranged between a driving work 15 and a driven work 16 and continuously rotates by turning h. 2, and is moving in the same direction as the conveyor 2 at approximately the same speed (within a range that does not exceed the speed of the conveyor 2).

As described above, at the position where the transport claw 3 enters the weighing device 4, the swing plate 3a of the transport claw 3 lowers horizontally, so the workpiece W floats up from the claw plate 3a. The sample is transferred onto the transfer belt 14 and then transferred to the conveyor 2 through the five weighing tables.

Next, a detected value of the moving position of the conveyor 2 is input to a control device (not shown), and based on this, the control device outputs the timing immediately before and after the workpiece W is transferred to the transfer belt 14. At this point, a measurement command signal is output to the weighing device 4.

Here, the operation of the weighing device of the embodiment configured as described above will be explained.

When the transport claw 3 carrying the workpiece W passes through the scale table 5, weighing operations are performed before and after transferring the workpiece W, and signals of both weighed values are input to the controller.

Therefore, in the control device, the weight difference between the two weighed values is compared with a predetermined weight classification stage, and the classification stage is selected. Command 9.

As a result, the transport claw 3 that has passed through the weighing device 4 and placed the work W again drops the work W onto the chute above the sorted discharge chute 9 and discharges it to the side of the conveyor 2. let

Therefore, in the weighing operation of the embodiment, since measurement is performed based on the weight difference, the weight of the transport claw 3 as a transport container is irrelevant to measurement accuracy, and therefore, highly accurate measurement can be performed. be exposed.

As described above, according to the weighing device according to the present invention, the transfer belt is arranged on the weighing platform of the weighing device, and when the carrying claw on which the work is placed passes through the weighing platform, the work is transferred to the transfer belt. Since the structure is such that the workpiece can be transferred and loaded, it is possible to perform zero correction of the weight by removing the workpiece the moment the workpiece is not on the measuring table or once every fixed period of time during each measurement. This has the effect of constantly maintaining high measurement accuracy.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of a weighing device showing an embodiment of the present invention, FIG. 2 is a plan view at the point of expiration (■) in FIG. 1, and FIG. 3 is an enlarged view of the weighing section in FIG. 1. It is. W... Work as an object to be measured, 2... Conveyor,
3...Transportation claw, 3a...Claw plate, 4...Weigher, 5
... Weighing stand, 14... Transfer belt, 14a... Belt band. Patent applicant Anritsu Electric Co., Ltd.

Claims (1)

[Claims] A transport claw that is driven by a conveyor and moves horizontally at a constant speed, and is equipped with a large number of claw plates arranged intermittently in parallel within the width line, and a transport claw that is suspended on the transport path of the transport claw. The scale table is an endless transfer belt that is held and moves horizontally at approximately constant speed, and is composed of a plurality of belt bands that are intermittently parallel to the claw plate at the wrong position within the width line. During the weighing operation in which the transport claw moves over the weighing platform, the object to be weighed placed on the transport claw is lowered based on the tilting of the transport claw. . A weighing device, wherein the object to be weighed is transferred to the transfer belt and moved in a floating state from the transfer claw.