JPH0848315A - Detection of powder, etc., adhered on heat-sealing surface of bag in packaging machine - Google Patents

Abstract

PURPOSE:To detect whether a powder is stuck to the heat-sealing surface of a bag in a packaging machine, or two or more bags are pinched or not. CONSTITUTION:For a detecting method of the adhesion of a powder, etc., on a heat-sealing surface of a bag, a toggle type bag-pinching machine with a main arm 15 which is rocked by a main shaft by an elevating mechanism, and curved arms 2a, 2b which are opened/closed by a supporting bar 12 being connected to the main arm is provided. When both surfaces of a bag (a) are pinched by the bag-pinching machine, a displacement of the main arm 15, supporting bar 12 or curved arms 2a, 2b, etc., at a displacement location is measured by a displacement-detecting device (e.g. a proximity switch), and whether a powder, etc., are stuck onto the heat-sealing surface or not is judged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting whether powder is attached to the heat-sealing surface of a bag of a packaging machine or two or more bags are sandwiched.

[0002]

2. Description of the Related Art A packaging machine is supplied with one bag at a time, a process of grasping both vertical edges, a process of opening, a process of inserting an object to be enveloped into the opened bag through a hopper, and a bag sealing. It is divided into processes, etc., and carried out sequentially.

[0003]

In the above packaging machine,
In the process of supplying the bags one by one, sometimes two or more bags are picked up and supplied. In this case, the bag is conveyed as it is, the object to be encapsulated is introduced, and the two bags are sealed together in the sealing step, resulting in the generation of defective products and the bags being wasted. In addition, when the encapsulated material is powdery and easily adheres (adhesive), it adheres to the heat-sealing surface, resulting in defective sealing and defective products. Therefore, it is desired to detect whether powder or the like is attached to the heat-sealing surface of the bag at an early stage and stop the production of defective products.

[0004]

According to a first aspect of the present invention, there is provided a method for detecting dust or the like adhering to a heat-sealing surface of a bag, which comprises a main arm swingable by a main shaft via an elevating mechanism and a support rod connected to the main arm. A toggle-type bag sandwiching machine with a curved arm that opens and closes via a bag is provided, and when both sides of the bag are sandwiched by the bag sandwiching machine, displacement detection of the displacement location of the main arm, support rod, or curved arm is detected. By measuring through a device, it is determined whether or not powder or the like is attached to the heat-sealed surface.
Further, the method for detecting powder or the like adhering to the heat-sealing surface of the bag according to claim 2 is the same as in claim 1, wherein the displaceable support rod is measured using a proximity switch, and the powder or the like adheres to the heat-sealing surface. It is to determine whether there is. A method for detecting powder or the like attached to the heat-sealing surface of a bag according to claim 3, wherein a fixing plate is installed on one side of the bag, and a measuring rod is installed on the other side of the bag. The thickness of the bag is measured by sandwiching the bag, and whether the powder or the like is attached to the heat-sealed surface is determined by the thickness of the bag.

[0005]

According to the first aspect of the present invention, there is provided a method for detecting dust or the like adhered to the heat-sealing surface of a bag, wherein when both sides of the bag are sandwiched by a toggle type bag sandwiching machine, one bag and two stacked bags, or The thickness is different when powder is attached to the sealing surface. This difference is that in the toggle type bag sandwiching machine, the displacement is larger than the thickness of the bag at the displacement position of the main arm, the support rod or the bending arm, and this displacement amount is detected. By measuring with a device, it is possible to easily determine whether or not powder is attached to the bag. According to the second aspect, the amount of displacement of the support rod of the toggle type bag sandwiching machine, which is largely displaced relative to the thickness of the bag, is measured by the proximity switch, and powder or the like adheres to the bag by a simpler method. Is what you do. According to the third aspect, the thickness of the bag is measured by the moving amount of the measuring rod that moves to the fixed plate, and as a result, it is determined whether or not powder or the like is attached to the bag.

[0006]

【Example】

(Embodiment 1) The present invention will be described with reference to FIG. 1 showing a plane of a heat sealer portion of a bag, FIG. 2 showing a front surface of FIG. 1, and FIG. 3 showing a perspective view showing a displacement detecting device. Reference numeral 1 is a toggle heat sealer, which also serves as a bag sandwiching machine of the present invention. The pair of curved arms 2, 2 composed of the main sandwiching arm 2a and the sub sandwiching arm 2b are rotatable on a main rotating shaft 3 fixed to a base (not shown). At the lower end of the one main sandwiching arm 2a, a sandwiching body 6 containing a heater 7 is fixed with a bolt 4 via a heat insulating body 5. Also, the other main holding arm 2
An attachment member 8 is fixed to the lower end portion of a by a bolt 4, and a heater 7 and an internal sandwiching body 6 are fixed to the attachment member 8 via a heat insulator 5 via a bolt 9. In addition, 10 is an adjusting body which adjusts the up-and-down contact condition of the opposing holding body 6.

An upper end portion of the sub-holding arm 2b is connected to a metal support rod 12 through a connecting member 11 which can be rotated by a rotation shaft 11a, and the support rod 12 is lifted and lowered in the middle. A main arm 15 that is pivotally connected by a rod 13 and a pivot shaft 15a.
Done through. The support rod 12 has a guide body 12a attached to an end thereof, and a pair of guide bodies 30 provided upright on both sides.
Sliding up and down with respect to 30 prevents twisting. Further, as a displacement detecting device for measuring the displacement of the support rod 12, a proximity switch 50 having a transmitting circuit or the like for detecting the position is attached to the upper portion of the guide body 12a via the attaching body 30a.

The main shaft 16 is a support member 1 provided upright on a base 17.
The main arm 15 is attached to the main shaft 16 so as to be swingable. The sub-arm 20 is swingable on the main shaft 16 at both outer ends of the support member 18, extends along the lower side of the main arm 15 via a Y-shaped arm in plan view, and has the other end. The part is attached to a main rod 21 that moves up and down via a lifting mechanism (not shown) via a rotating shaft 21a.

When the main rod 21 rises (FIG. 4), the rotating shaft 26a of the main arm 15 opens the sandwiching body 6 through the rod 26 biased by the elastic body 25 to receive the bag. It is configured to be possible. On the other hand, the locking claw 28 that can be rotated by the rotation shaft 28 a formed on the sub arm 20 is provided on the main arm 15.
A bolt 22a can be engaged with a spacer 22 for preventing wear, which is fixed to the rear end of the main arm 21, and lowers the main arm 15 when the main rod 21 descends. And the main arm 15
The sub-arm 20 and the sub-arm 20 are swingable as a unit. However, even if the sub-arm 20 swings by detaching the locking claw 28 via a disengaging means not shown, The arm 15 stops swinging, and heat sealing can be prohibited.

Next, the operation of the above structure will be described. When the main rod 21 moves up and down via an elevating mechanism (not shown), the sub arm 20 and the main arm 15 swing on the main shaft 16. When the end portion of the main arm 15 is moved up and down, the support rod 12 is moved up and down, and the main rotating shaft 3 is moved through the auxiliary holding arm 2b.
Then, the main holding arm 2a is opened and closed. That is, when the support rod 12 descends, the main sandwiching arm 2a is opened and the sandwiching body 6 is also opened (state shown in FIG. 4). On the contrary, support rod 1
When 2 rises, the main holding arm 2a is closed,
The sandwiching body 6 is closed to seal the bag a (state shown in FIG. 2).

At this time, when the sandwiching portion (heat seal portion) of the bag a is a stack of two sheets or when powder is attached, it is compared with the case of one bag (normal). Then, the thickness becomes thicker, and the difference is amplified and displaced by the toggle mechanism. As a result, the raised position of the metal support rod 12 is stopped at a lower position than in the normal state, and the displacement detection device can detect it more easily. As this displacement detecting device, as shown in FIG.
By attaching 0, it is possible to easily determine whether the thickness of the bag a is not attached with powder or one bag, and in such a case, through a control device (not shown),
The defective product can be prevented from being discharged by discharging it at another place (a place different from the product) as a defective product or by issuing an alarm and stopping.

In the above description, the position where the change in the thickness of the bag a is detected is determined by the support rod 12 that moves up and down, but the bending arm 2 (the main holding arm 2a, the sub holding arm 2b). ,
The main arm 15, the sub arm 20, and the like may be located at a position where the bag a is clamped, and the detection device may be a proximity switch or a transmission type photoelectric sensor that detects light by conducting or blocking light at a predetermined position. A switch or a reflective photoelectric switch may be used. Further, in the above example, the heat sealer is used as a bag sandwiching machine, but it goes without saying that a bag sandwiching machine may be separately installed to make the determination.

(Embodiment 2) Next, another means for detecting whether powder or the like is attached to the heat-sealed portion of the bag will be described. Note that this detecting means directly measures the thickness of the bag, unlike the case where the thickness of the bag can be detected by the amplified displacement in the first embodiment. FIG. 5 (plan view) and FIG. 6 (front cross-sectional view) show that the heat-sealing portion of the bag a is sandwiched via the cylinder mechanism, and whether the powder adheres or two sheets are stacked depending on the thickness of the bag. To do.

Reference numeral 40 denotes a sandwiching arm for gripping the vertical edge of the bag a. Reference numeral 41 denotes a fixed plate vertically provided on the lift table 42, to which the proximity switch 50 is attached. On the other hand, a metal body 51 is attached to the tip of the rod 44a of the cylinder 44, and when the cylinder 44 is "OFF", the metal body 51 and the proximity switch 50 are separated via the intermediate body 45 (FIG. 5). When the cylinder 44 is “ON”, the metal body 51 moves the proximity switch 50 through the elastic body 47 attached to the intermediate body 45.
It acts in the contact direction and has a cushioning effect at the time of contact. Check if there is powder on the heat-sealing surface of bag a.
With the cylinder 44 in the “ON” state, the metal body 51
The change in the movement amount of the (measurement rod) is measured by the proximity switch 50 to make a determination.

The lifting table 42 has a fixed plate 41, a measuring cylinder 46, and an air cylinder 44 which can be lifted up and down as a unit, and at a timing of loading and unloading the bag a via a lifting device (not shown). Move up and down. That is, after the arrival of the bag a,
The elevating table 42 is lowered (FIG. 6), and then the cylinder 44 is started to sandwich the bag a between the metal body 51 and the proximity switch 50, and the thickness of the bag is determined by the output of the proximity switch 50. . An elastic body 47 attached to the intermediate body 45
Acts as a buffer between the metal body 51 and the proximity switch 50. In the above mechanism, the proximity switch 50 measures the bag a.
When the thickness is within a predetermined range, it is normal, and therefore the elevating plate 42 is raised to prepare for the next bag a. Conversely,
When the thickness of the bag a is out of the predetermined range, it is determined that powder is attached or the two bags a are stacked, and the bag a is
Similar to the first embodiment, the process is performed as a defective product.

(Embodiment 3) Next, as another example of measuring the thickness of the bag a, a well-known ball screw mechanism is used. In this case, in FIGS. 5 and 6, the measuring cylinder 46 is a ball screw, a metal body 51 is attached to the end of the screw (measuring rod), and the screw is driven by a stepping motor. In the case of the ball screw mechanism, the proximity switch 50 mounted on the fixed plate 41 is unnecessary. When the bag a comes to this place, the fixing plate 41 is lowered to one side of the bag a and the metal body 51 is lowered to the other side of the bag a through a lifting device (not shown) to a position where the bag a seals. Then, the stepping motor is driven to count the number of pulses while detecting the current value of the motor. The number of pulses is determined when the current value exceeds a predetermined value, that is, when the metal body 51 sandwiches the bag a and contacts the fixed plate 41.

The amount of movement of the screw (measuring rod) is known from this pulse number, and the thickness of the bag a is measured. If powder or the like is adhered, the count number becomes smaller than the normal state, and the above-mentioned steps are performed. The defective product is treated in the same manner as in Example 1. On the other hand, when the number of pulses is within a predetermined value, the screw is returned to the original state by the stepping motor, and then the fixing plate and the ball screw mechanism are lifted via an elevator device (not shown) to Prepare for the bag. Even if the ball screw mechanism is used in this way, it is possible to easily detect whether powder or the like is attached to the seal portion of the bag.

[0018]

EFFECT OF THE INVENTION The method of detecting powder adhered to the bag of the present invention is
By using a toggle type bag sandwiching machine, the bag thickness is amplified and displaced, so it is possible to easily determine whether powder is attached or another method of directly measuring the bag thickness. Also, similarly, the determination is easy, and the occurrence of defective products can be prevented in advance.

[Brief description of drawings]

FIG. 1 is a plan view of a heat sealer portion of a bag.

FIG. 2 is a front view of FIG.

FIG. 3 is a perspective view showing a displacement detection device.

FIG. 4 is a view showing the action of the heat sealer.

FIG. 5 is a plan view showing another detecting means for detecting whether powder or the like is attached to the bag.

FIG. 6 is a front cross-sectional view of FIG.

[Explanation of symbols]

 1 Toggle Type Heat Sealer 2 Curved Arm 6 Clamping Body 12 Support Rod 15 Main Arm 20 Secondary Arm 21 Main Rod 30 Guide Body 40 Clamping Arm 44 Cylinder 50 Proximity Switch 51 Metal Body

Claims (3)

[Claims] 1. A packaging machine in which an object to be encapsulated is intermittently fed into a bag and then the opening of the bag is heat-sealed,
A toggle-type bag sandwiching machine having a main arm that swings by a main shaft via an elevating mechanism and a bending arm that opens and closes via a supporting rod connected to the main arm is provided, and the bag sandwiching machine heat seals the bag. When both sides of the heat-sealing surface are sandwiched, it is determined whether or not powder or the like is attached to the heat-sealing surface by measuring the displacement of the displacement position of the main arm, the support rod, the bending arm, or the like through a displacement detection device. A method for detecting powder adhered to the heat-sealing surface of a bag, which is characterized in that 2. The method for detecting dust or the like adhering to the heat-sealing surface of a bag according to claim 1, wherein a proximity switch is used as a displacement detecting device for the displacing support rod. 3. In a packaging machine in which an object to be encapsulated is intermittently sent to a bag and then the opening of the bag is heat-sealed, a fixing plate is installed on one side of the bag and the other side of the bag is installed. A measuring rod is installed in the bag, the bag is clamped by the measuring rod and the fixing plate, and the thickness of the bag is measured. Based on the thickness of the bag, it is determined whether powder or the like is attached to the heat-sealing surface. A method for detecting powder or the like adhering to the heat-sealing surface of a bag, which is characterized by: