JPH0317700B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a packaging defect detection device in a packaging machine.

[Conventional technology and problems]

The packing machine feeds a thermoplastic band for packing to the outside of the main body, grips and fixes the tip of the band arranged so as to surround the object to be packed between a slide table and a press member, and then presses the band supply end. After pulling back the band from the side and tightening it, the band supply end side is fixed between a slide table and a press member,
Next, the band is cut, and a heater inserted into the overlapped part of the band tip and the band supply end melts both overlapped parts, and after the heater is pulled out, both are crimped between the slide table and the press member, and the slide table is The machine moves backward, takes out the items to be packed, and completes one packing process.

Conventionally, packaging defects in the known packaging process in this type of packaging machine may occur, such as when the packaging band is not sufficiently tightened and adhered to the item to be packed, or due to poor temperature adjustment of the heater, etc., resulting in the band overlapping part. As a device for detecting non-adhesion, as shown in Japanese Utility Model Application No. 56-103404, there is a support attached to a guide provided on the work table of a packaging machine along the transport direction of the packaged items. On the stand,
It has been proposed that a lever protruding in the transfer direction from the direction opposite to the transfer direction is provided on the binding operation surface of the items to be packed, that is, the surface on which the band is applied. is the surface that wraps around the object to be packed, and when the distance from the arch to the side of the object to be packed is long, it is inevitable that the band will wrap around in a meandering manner as it is pulled back, and the band will not hit the lever and the object will be wrapped around the object. In this case, even if the band is wrapped around the object to be packed and tightened, the packaging will be defective.Also, since the lever is attached to the support base provided on the guide on the work table, it is not possible to use a general-purpose band. It is unsuitable for this type of packing machine.Furthermore, if the object to be packed is soft, the band will dig into the object along with the lever, and even if you try to transfer the object, the band will cut into the object through the lever. This has the disadvantage that the transfer cannot be carried out.

The present invention can also be used for general-purpose packaging machines,
In addition, defective packaging is always detected reliably, and the detection signal is used to stop moving on to the next packaging process, or to automatically stop the packaging line in the case of defective packaging in a packing machine in the packaging line. The purpose is to

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention includes a slide table that can move forward and backward, and a press member that is provided so as to be able to move up and down with respect to the slide table, and a band overlapping portion is formed between the slide table and the press member. In a packaging machine installed to perform crimping, a locking rod is provided on the side surface of the slide table and is rotatable by locking onto the band overlapping portion, and the locking rod is configured to detect whether or not the locking rod has rotated within a predetermined time. It is characterized by being equipped with a limit switch for detection.

[Effect]

When the slide table is moved back after the welding process of the overlapping portions of the packaging bands, the band moving toward the work table on the slide table rotates the locking rod, thereby activating the limit switch and generating a signal. When packaging is defective, the locking rod does not rotate within a predetermined time and the limit switch does not operate, so a packaging defect detection signal is generated.

〔Example〕

Hereinafter, details of the present invention will be explained based on embodiments shown in the accompanying drawings.

In Figures 1 to 4, 10 is a slide table, a right press 11 and a left press 1 that can be raised and lowered.
2. The head of the medium press 13 is pressed against the lower surface of the slide table 10, which can move forward and backward onto each press member, via a band. 14 is a work table, and the surface of the work table 14 is provided with a predetermined gap between the lower surface of the slide table 10 and the lower surface of the slide table 10. Reference numeral 15 denotes a band guide having a U-shaped cross section, through which the band sent from a hole 16 provided above the right press 11 passes through a U-shaped insertion hole 17 to form a left bandway flat that can be opened and closed. It passes through the band guide arch (not shown) outside the main body through a loop 18, reaches the lower surface of the slide table 10 and the upper surface of the band guide 15, and is configured to operate the striker 19 of the limit switch.

In addition, B is a band, 5 is an operating lever, which opens and closes the left bandway flap 18, and 6 is an operating lever, which moves the slide table 10 to the left in FIG. The upper part of the press mechanism is opened so that the bonded band overlapping part comes out onto the work table 14 (outside). In Figure 1, 7 is the right bandway flap that can be opened and closed;
is a heater that is inserted and removed between the band overlapping parts.

The packaging defect detection device 20 according to the present invention has a third
As shown in the figure, the lower ends of L-shaped locking rods 21 and 22 are respectively attached to rotatable links 23 and 24, and both links 23 and 24 are connected at the center by a pin 25. The L-shaped locking rods 21 and 22
The upper end is provided so as to form a U-shaped gate above the band in front of the left bandway flap 18 in the band traveling direction on the side surface of the slide table 10, and the tips of the L-shaped locking rods 21 and 22 are They are configured to open and close facing each other in the band width direction. In addition, the upright portion 2 of the L-shaped locking rod 21
1' is in contact with a step 10' formed on the front side of the slide table 10.

The links 23 and 24 are attached to the mounting plate 25 with pins 26,
27, each is rotatably mounted, and
The link 24 is a continuous rod 2 with one end bent in a substantially dogleg shape.
4', and one end of the spring 28 is attached to the lower end. The other end of the spring 28 is locked to the mounting plate 25, and in order to urge the link 24 in the counterclockwise direction in FIG. bias in the direction. Therefore, the L-shaped locking rods 21 and 22 forming the U-shaped gate are configured to remain closed at all times.

A limit switch 30 is fixed on the mounting plate 25, and the roller 31 of the roller lever is in contact with the side surface of the connecting rod 24' of the link 24 when the gate is closed.

Note that the L-shaped locking rods 21 and 22 can be provided on only one side, and a limit switch can be provided so that they can be operated freely, and it is not necessary to limit the locking rods to only the L-shape. Needless to say.

The present invention has the above-mentioned structure, and its operation will now be explained. Band B is now wound around the object to be packed and tightened, and the process of cutting the band supply end and bonding the band overlapping part is completed. , as shown in FIG. 1, the slide table 10 is retracted,
When the upper part of the press mechanism of the middle presses 11 to 13 is open and the band is properly welded, there is a distance between the work table 14 and the lower surface of the slide table 10, and the band is evenly tightened around the object to be packed. Therefore, the tension of the band opens the gate-like L-shaped locking rods 21 and 22 in opposite directions against the tension of the spring 28 provided at the lower end of the link 24, and the roller of the limit switch 30 opens. 31
moves counterclockwise in FIG. 3, the limit switch 30 issues an ON signal, and at the same time the bonded band is exposed to the upper (outward) surface of the work table 14.

Although the sequence is omitted, if the ON signal of the limit switch 30 is received within a predetermined time after the signal that the press mechanism etc. has returned to the previous position, the band is fed to the arch outside the packaging machine body, which is the normal next packing process. Preparation begins and ends.

On the other hand, if the packaging is defective, for example, if the bonding is defective, that is, if the overlapping part of the band is not completely bonded, the L-shaped locking rod 2 may be damaged due to the slide table retreating.
Since the limit switch 30 is not turned on within a predetermined time after the gate formed by the gates 1 and 22 is not opened and a signal indicating that the press mechanism etc. has returned to the previous position is generated, a packaging defect detection signal is generated, and this signal causes the
For example, a packaging line such as a conveyor is stopped, a lamp is turned on, and the next packaging preparation is not started.

As a packing defect, if the band is sufficiently attached to the packaged item but is not tightened tightly enough, the gate will not open and the signal from the limit switch 30 cannot be obtained, resulting in the same problem as an adhesion defect. It is activated.

〔Effect of the invention〕

As described above, the present invention makes it possible to detect packaging defects such as failure to tighten the prescribed amount or complete band welding with an extremely simple configuration, and is particularly applicable to unmanned packaging lines. It is possible to detect packaging defects and to prevent items from collapsing during loading, storage, or transportation of poorly packaged items. Furthermore, it can be used for a wide range of purposes, and has great practical effects, such as detecting that the packaged item is not in the specified packing state or in a certain fixed state when it is necessary to bind it tightly, such as a large and hard object. It is something.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall perspective view, FIG. 2 is a sectional view taken along the line of FIG. 4, FIG. 3 is a sectional view taken along the line of FIG. FIG. 10...slide table, 10'...stepped section,
14... Working table, 21, 22... Locking rod (L-shaped rod; gate), 23, 24... Link, 2
5... Mounting plate, 26, 27... Pin, 28... Spring, 30... Limit switch, 31...
Laura, B...band.

Claims (1)

[Scope of Claims] 1. A package that has a slide table that can move forward and backward, and a press member that is provided to be able to move up and down with respect to the slide table, and that is provided to press the overlapped portion of the band between the slide table and the press member. In the machine, a locking rod is provided on a side surface of the slide table and is rotatable by locking onto the band overlapping portion, and
A packaging defect detection device for a packaging machine, characterized in that a limit switch is provided to detect rotation of the locking rod within a predetermined time.