JPH0740940A - Weighing/packaging device - Google Patents

Abstract

PURPOSE:To prevent a checker from interfering with the existence of s clamp for supporting a bag when the weight of the whole body of a bag is measured by a checker which is provided in the middle of a circular orbit. CONSTITUTION:A packaging device dispense an object to be packaged in a bag which is opened at point C while a bag 25 being fed to clamps 20 from the outside at point A are supported and being carried. For such a packaging device, the clamps 20 are opened only for a specified period of time at point E, and at the same time, the bag is supported by a pair of movable jaws which are provided on a metering mechanism while the clamps are opened, are the weight of the bag is measured by the weighing mechanism 40. Then, the error between the weight measured by the weighing mechanism 40 and the target weight which is previously stored in a control unit 61 is calculated, and the object to be packaged the amount of which is equal to the weight shortage found by the calculation is supplemented in the bag by a weighing supplementing mechanism 63.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary-type weighing bag filling and packaging apparatus for filling a packaging bag moving along a circular orbit while weighing an object to be packaged.

[0002]

2. Description of the Related Art As a general device of this system, a computer system having excellent weighing efficiency as shown in, for example, Japanese Unexamined Patent Publication No. 49-39451 is used for a bag which is suspended from a clamp and moves on a circular orbit. Although there is one that fills the packaged items weighed with an electronic scale, it is difficult to evenly distribute the packaged items with highly viscous packaged items such as boiled beans and kinpira burdock, so fill each bag. The measurement error of the packaged item is large and the efficiency is low. Therefore, the bag filled with the packaged item is put on another scale and the weight is re-measured, and the packaged item corresponding to the insufficient measurement is replenished into the bag in a circular orbit to prevent the efficiency from decreasing. There is.

[0003]

However, once the bag is released from the clamp for measurement, when the clamp re-catches the bag, the catch position between the bag and the clamp is deviated, and finally the bag mouth is heated and sealed. When performing, the gap occurs between the bag mouth and the sealing position. However, even if the bag held on the clamp is placed on the scale, the clamp interferes with the scale via the bag, which causes a problem that accurate measurement cannot be performed.

[0004]

According to the present invention, in order to provide a packaging apparatus in which there is no seal deviation with respect to the bag mouth and interference of the clamp with respect to the scale, two sets are provided at the periphery of a rotor having a vertical main shaft. And a clamp bag provided at the tips of both clamp arms, and a bag for packaging having both side edges clamped by clamps respectively, is moved intermittently along a circular orbit by the rotation of the rotor. In a packaging machine configured to fill the bag with the objects to be packaged at one stop position, a closing biasing force of both clamps at a bag stop position behind the object filling position in the rotation direction of the rotor. Against the force, the clamp mechanism opens the clamps for a certain period of time, and the middle part of the bag mouth is held by the pair of movable jaws for fishing during the clamp release time by the pressing mechanism at the stop position. And a controller for calculating a shortage error between a measurement value sent from the load cell of the weighing mechanism and a target value recorded in advance in a storage device. Receiving the shortage error calculated by the controller as an electric numerical signal, and refilling the bag corresponding to the numerical signal into the bag at the rear of the weighing mechanism based on the numerical signal. And a measuring and replenishing mechanism.

[0005]

Operation: When a bag, which is clamped on both side edges by a pair of clamps and intermittently moves in a circular orbit, stops at a rear position subsequent to filling the bag with an object to be packaged, the pressing mechanism is provided with a closure of the clamp. Open the clamp for a certain period of time against the power,
At the same time, the pair of movable jaws hold the middle portion of the bag mouth of the bag to prevent the bag from falling and select the weight of the entire bag to the load cell through the movable jaws. The holding time of the bag by the movable jaw corresponds to the elapsed time when the clamp opens the bag, and the weight of the packaged object in the bag is measured by the load cell while the movable jaw is hanging the bag. Input to the controller.
A target weight is set in advance in the storage device included in the controller, and the controller determines an error (difference that is insufficient from the target weight) between the actual measurement value of the load cell and the target weight value in the storage device. Index and send it to the rear weighing aid. Therefore, when the bag moves along the circular path to the rear weighing assist mechanism, the weighing assist mechanism refills the bag with the object to be packaged corresponding to the previous insufficient index at that position.

[0006]

EXAMPLE A bag-filling machine shown in FIG.
Eight pairs of arms (11), each consisting of two arms, are pivotally supported on the periphery of (0) via pins (12), and a pair of fan-shaped gears (13) and (14) fixed to the pins are provided. Occlusal two arms (1
1) allows them to oscillate in the relative direction in synchronization with each other, while a lever (15) connected to one arm of the two arms is provided with a coil spring (1) provided between the two arms.
It is pressed against the peripheral surface of the cloud cam (17) by the tensile force of 6).
Therefore, when the rotor (10) is intermittently rotated in the direction of the arrow (19) integrally with each arm (11) by the main shaft (18) of the central portion, the lever (15) that moves along the peripheral edge of the cloud cam (17). Thus, the distance between the arms (11) of each pair of pairs changes in the shape of the cloud cam (17).

As shown in FIG. 2, the clamp (20) provided at the tip of each arm (11) is normally closed by the tension of the coil spring (21) installed in the arm, and the clamp (20) is attached to the clamp (20). Pin roll (23) connected via a rod (22)
The holding force of the clamp (20) on the bag (25) is released by applying a pressing force such as the arrow (24) to the. L-shaped pushing arm (28) supported on the machine base (26) of the bagging machine via pins (27) and seesaw arm (31) supported on the machine base (29) via pins (30). And the rod arm (32) are connected to each other, while the groove cam (34) rotating synchronously with the rotor (10) via the power transmission shaft (33) swings the seesaw arm (31) around the pin (30). By the movement, the pushing striking arm (28) can exert a pushing force as shown by the arrow (24) on the pin roll (23).

A clamp arm that rotates intermittently in FIG.
When (11) stops at point A, the pushing arm (28) shown in FIG. 2 opens the clamp (20) for a certain period of time, so that the bag (25) adsorbed on the vacuum cup (35) of FIG. When supplied from the outside in time, the bag is clamped by the clamp (20) and hung down. After that, the bag suspended on the clamp (20) is rotated by the rotor (10) B
Carry to point C. Meanwhile, the distance between the pair of arms (11) is reduced by the cloud cam (17) to widen the mouth of the bag (25). C
As shown in FIG. 3, an endless chain (37) having a large number of buckets (36) mounted at equal intervals is rotating at a constant speed at a point, and the volume-measured object to be packed in the bucket (36) is Every time the bag (25) is stopped downward, the bag (36) is inverted and dropped into the bag (25) through the morning glory hopper (38) to be filled.
Subsequently, the bag passes through point D to point E, where it is released from the clamp and at the same time is weighed by the weighing mechanism (40).

That is, at the point E, the pushing arm (28) shown in FIG. 2 is provided, and when the bag suspended by the clamp stops at that position, the pushing arm (28) moves to the pin roll (28). Hit 23) to release the clamp (20). For this reason, the bag (25) tries to drop downward due to the weight of the object to be packaged, but immediately before that, the holding action of the pair of movable jaws (41) (42) prevents the bag (25) from falling. It is supposed to do. Ie Paul
(43) Pin both movable jaws (41) and (42) on a block (46) suspended from a load cell (45) on a support plate (44) at the upper end, respectively.
(47) supported via a pair of gears (48) and (49) fixed to the pins respectively, and both movable jaws (41) and (42) can rotate in conjunction with each other, and the block The piston rod (51) of the fixed fluid cylinder (50) is connected to the upper end of the movable arm (41) on one side. Normally, the tension of the coil spring (52) in the cylinder causes both movable arms (41) and (42) to wait in an open state, and the upper edge of the bag (25) stops between these movable arms (41) and (42). Then, the pusher (53) fixed to the upper surface of the rotor (10) simultaneously closes the switch (54), and the solenoid (55).
Both movable jaws (41) (42) are spring (52) due to the pressure fluid acting in the cylinder (50) from the pump (57) through the circuit (58) by exchanging the solenoid valve (56). Hold the upper edge of the bag (25) against the tension of. Hold the bag with both movable jaws (41) (42) for the clamp (20) with the bag (25) with the timer (59).
Is set to be almost equal to the time that is released. As a result, during this time, the total weight of the packaged items in the bag is the load cell (45).
The load cell (45) outputs the weight measurement value of the packaged object to the controller (61) via the circuit (60).

When the measured value from the load cell (45) in FIG. 4 is input to the controller (61), the controller causes the memory device (6
The target weight value previously recorded in 2) is extracted, and the error between this target weight value and the weight value already sent from the load cell (45) is calculated. In other words, since this calculated value corresponds to the shortage of the target weight, the controller (61) will reach when the bag, which has been weighed in the package at point E in FIG. 1, reaches point F.
Sends the value of the shortfall to the replenishment mechanism (63). The metering and replenishing mechanism shown in FIG. 4 receives the feedback signal (66) from the second load cell (65) which bears the load of the metering gutter (64), and the controller (61) sends an instruction signal (68) to the vibrator (67). Then, the wrapping material corresponding to the shortage is once dropped from the gutter (64) to the middle hopper (69), and then a sufficient amount of the wrapping material is replenished from the hopper (69) to the bag (25).

[0011]

[Effects] The present invention provides a pair of movable jaws that open the clamp for a fixed time by a pressing mechanism provided in the middle of a circular orbit for supporting and conveying the bag by the clamp, and close the bag in response to the opening action. The bag is temporarily supported and weighed, and the shortage of the items to be packed calculated by such weight measurement is replenished into the bag by the weighing mechanism at the rear. The action is accurate and there is no load interference of the clamp, and the clamp re-clamps the position of the bag that was previously held.Therefore, the sealing position for the bag mouth does not shift and it is always possible to seal to the same position. it can.

[Brief description of drawings]

FIG. 1 is a plan view of the present invention.

FIG. 2 is a cross-sectional view at point E in the previous figure.

FIG. 3 is a sectional view of a point C in FIG.

FIG. 4 is a cross-sectional view of a point F in FIG.

[Explanation of symbols]

(10)… Rotor (11)… Arm (20)… Clamp
(25)… Bag (28)… Pushing arm (pressing mechanism) (40)… Weighing mechanism
(41) (42) ... Movable jaw (45) ... Load cell (61) ... Controller (62) ... Memory device (63) ... Weighing replenishment mechanism (64) ... Weighing gutter
(65)… Load cell (66)… Feedback signal
(67) ... Vibrator

Claims (1)

[Claims] 1. A packaging bag in which two pairs of clamp arms are provided on the periphery of a rotor having a vertical main shaft, and both side edges are sandwiched by clamps provided at the tips of the two clamp arms. , In a packaging machine configured to intermittently move along a circular orbit by the rotation of the rotor and to fill the bag with the article to be packaged at one stop position thereof, in the rotation direction of the rotor. A pressing mechanism that opens the clamps for a fixed time against the closing biasing force of the clamps at the bag stop position after the packed object filling position, and a bag during the clamp opening time by the pressing mechanism at the stop position. A weighing mechanism that holds the middle part of the mouth with a pair of movable jaws to select the weight of the entire bag for the hanging load cell, and the measurement value sent from the load cell of the weighing mechanism and the storage device. A controller for calculating a shortage error between the recorded target value and the shortage error calculated by the controller as an electric numerical signal, and based on the numerical signal, a packaged portion corresponding to the numerical signal is packaged. A weighing bag packing and packaging device configured by a weighing and replenishing mechanism configured to replenish items in the bag at the rear of the weighing mechanism.