JP3303734B2 - Stretch wrapping machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a stretch wrapping machine. More specifically, the present invention relates to an improvement in film cutting means for cutting a film fed from a film roll into a predetermined length.

[0002]

2. Description of the Related Art Conventionally, this type of stretch wrapping machine is provided with a film roll in which a film is wound so as to be able to continuously wrap articles to be packaged, and a film drawn from the film roll is cut into a predetermined length. At that point, the film is cut, and the film is transferred to a packaging unit for packaging the article to be packaged, and packaging is performed. Means for cutting such a film into a predetermined length include those disclosed in JP-A-8-169408 and JP-A-9-12008, and those using a rotary cutter using a rotary blade.

[0003] Japanese Unexamined Patent Application Publication No. 8-169408 discloses a method in which a film gripping means movable to a predetermined position of a package grips and moves a film edge (in a longitudinal direction, not a width direction) to be cut. Then, when the film is pulled out for a predetermined length, the rear clamp starts moving at the same speed as the film and grasps the film, and at the same time, the cutter also starts moving at the same speed as the film and moves relative to the film surface. The film is cut at a right angle with a blade.

Japanese Unexamined Patent Application Publication No. 9-12008 discloses a transport belt that sandwiches both side edges in the width direction of a film and transports the film to a packaging unit, and a transport belt upstream of the transport belt in a film transport direction. A cutter that cuts the film with a saw blade that moves only in the vertical direction, pulls out a narrow film from the film roll, pre-stretches the film in the width direction according to the size of the object to be packaged, and then packs When the packaging machine is a packaging machine that packs objects, and the object to be packaged is smaller than a predetermined amount (the amount of pre-stretch is small), the drive of the conveyor belt that conveys the film is stopped because the film does not tear even if the film cutting part is rough When the length reaches the specified length, the film is cut with a cutter. If the packaged object is larger than the specified length (the pre-stretch amount is large), the pre-stretch In order to prevent the film from being torn (caused by slight roughness of the film cutting part), the film is cut by the cutter once the driving of the conveyor belt is stopped when the film is pulled out by the predetermined length. I'm going to do it.

[0005]

SUMMARY OF THE INVENTION The former Japanese Patent Application Laid-Open No. Hei 8-16
No. 9408 discloses that the cutter moves in the film transport direction at the same speed as the film and cuts the film by applying a blade substantially at right angles to the film surface. However, since not only the cutter but also the clamp is moved in the film transport direction, the mechanism becomes complicated and large-scale, which is an adverse effect on downsizing of the packaging machine.

[0006] The latter disclosed in Japanese Patent Application Laid-Open No. 9-12008 discloses that when the packaged object is smaller than a predetermined size, the prestretch is small, so that even if the cut portion is slightly rough, the film tears from the cut portion. Since there is no danger, the film can be cut with the cutter when the predetermined length is reached without stopping the driving of the conveyor belt for conveying the film, and as a result, the packaging speed can be improved. If it is larger, it is necessary to obtain a good cutting part, so the driving of the conveyor belt is temporarily stopped and the film is cut, which takes a long cycle time for packaging and greatly affects the packaging processing capacity. become. Also, if a controllable rotary cutter is applied to this type of packaging machine, it will be bulky due to its structure, which is not preferable for this type of packaging machine aiming at miniaturization.

Therefore, the present invention provides a stretch wrapping machine which always provides a good film cut portion, does not have a possibility of film tearing regardless of the amount of pre-stretch, and contributes to downsizing of the wrapping machine. That is the task.

[0008]

Technical means taken to achieve the above object are film transport means for stretching and holding a film drawn from a film roll on a packaging portion, and a film fed from the film roll. Tip of
Hold the film up to the entrance of the film transfer means
A film holding means for transferring the tip by transferring the tip;
Disposed between the film holding means and the film transport means,
Cutting means for cutting a film reaching a predetermined length, wherein the film cutting means is a film, wherein the film cutting means is a film A cutter which is held so as to be substantially perpendicular to the film and which can move in an acute direction to the film advancing direction and reciprocate in a straight line intersecting with the film. And reciprocating to cut the film.

According to the above technical means, the film transfer means transfers the film drawn from the film roll to the packaging section, and does not stop the film transfer when the film being transferred reaches a predetermined length. Then, the cutter advances at an acute angle with respect to the film advancing direction and the cutter edge is perpendicular to the film to execute the film cutting.

The film transport means for transporting the film to the wrapping section may be of a type which is provided on both sides in the film width direction and which transports the film by sandwiching both edges in the film width direction between a pair of upper and lower conveyor belts. Any of the types that grip the film end (in the longitudinal direction rather than the width direction) and pull it out to a predetermined position may be used. The former type, in which both edges in the film width direction are nipped and transported, is a cutter unit. Is provided on the upstream side of the film transport means. In the case of the latter drawer type, there is no particular limitation on the position in the film transport path which does not hinder packaging.

[0011] Further, it is preferable that the relative difference between the cutter speed (cutting speed) and the film transfer speed in performing the film cutting be as small as possible in order to obtain a good film cut portion. It is preferable to cut the film by reciprocating at a speed with little relative difference from the transfer speed. Furthermore, reciprocation of the cutter, also Noto reciprocate linearly drive source for reciprocating the cutter, as long as that converts electrical energy or pressure energy into mechanical linear displacement and rotational displacement Good,
For example, there are a solenoid, an air cylinder, an electric motor, and the like (claim 1).

In order to reduce the reciprocating movement of the cutter and facilitate the cutting of the film, the above-mentioned film cutting means is provided opposed to the cutter with the film interposed therebetween and receives and receives the cutter for performing the film cutting. A movable receiving portion is provided. It is preferable that the receiving portion has a U-shaped cross section and that a cutter is inserted into the opening thereof, or a sponge or the like having a sufficiently soft elastic force to receive the cutter. As in the case of the drive source of (1), it is driven by a solenoid, an air cylinder, an electric motor, or the like (claim 2).

Further, by being controlled so as to transfer the film to the film transport means the film holding means moves in said cutter portion and the receiving portion is separated, film transport film holding means, that the When the leading end of the film is moved to the entrance of the means and delivered, the cutter and the receiving portion can be applied without interfering with the delivery operation (claim 3). A packaging machine configured to be capable of moving in and out of the film in the width direction of the film, and extending the width of the cut narrow film in the width direction according to the size of the material to be packaged; Good to be.

[0014]

Next, embodiments of the present invention will be described with reference to the drawings. The drawings illustrate a packaging machine equipped with the film cutting means according to the present invention and suitable for packaging a tray and articles to be packaged on the tray with a film. In the figure, the symbol A indicates a packaging machine, and the symbol 6
Denotes a film cutting means, reference numeral 601 denotes a cutter, and reference numeral 6
02 is a receiving part.

As shown in FIGS. 1 and 2, a packaging machine A provided with a film cutting means 6 according to the present invention comprises
Conveyor 2, elevator 3, film holding means 4, film transport means 5, film cutting means 6.
And a discharge pusher 7.

The wrapping section 1 includes a folding plate 11 (horizontal folding) which can be moved in the horizontal direction to push and fold the edge of the film on the lower surface of an article to be packaged W comprising a product and a tray on which the product is placed. It comprises a plate 11a, a rear folding plate 11b) and a front folding rod 12 which is folded when the packaged material is carried out. As shown in FIG. 2, the conveyer unit 2 is provided with rotatable conveyors 21 arranged at predetermined intervals so as to transfer the articles W to the lower part of the packaging unit 1.

The elevator units 3 are arranged in five rows in the space between the conveyors 21 immediately below the packaging unit 1 and in the vicinity of the outer conveyors 21. The elevator unit 3 has a front stage (loading side) 304a and a rear stage (loading side).
A lifting rod 304 divided into a lifting rod 304b, a cam 305 connected to an electric motor (not shown) as shown in FIG. 2, and a vertical direction based on the displacement of the cam 305 connected to the lifting rod 304. Lifting mechanism 303 consisting of a link 306 that swings
When the folded object 11 is mounted on the upper surface of the elevating rod 304 and the folding plate 11 moves in the horizontal direction and pushes the edge of the film, it falls down or shrinks and the film is placed on the lower surface of the object W to be packaged. An elevator head 302 having an edge folded therein is provided, and the elevator head 302 is moved up and down by driving a lifting mechanism 303 via a lifting rod 304. As shown in FIG. 1, the base of the lifting rod 304a at the preceding stage is vertically slidably mounted on a standing rod 308 provided on the upper surface of a rotatable endless belt 307. At the same time, the base of the subsequent lifting rod 304b is connected to the above-mentioned lifting mechanism 303, and the rotation of the endless belt 307 in the counterclockwise direction causes the latter lifting rod 304b to remain in the fixed position while maintaining the previous lifting rod 304a. Only the lower roller rolls on the side of the base of the lifting rod 304b at the rear stage, and moves to the left in FIG. 1 so that the distance between the lifting rod 304 at the front stage and the rear stage can be adjusted.

The film holding means 4 holds the leading end of the film F unwound from the film roll FR set in the film roll disposing portion, and rotates the endless belt 41 to reach the leading end of the film F to the film transporting means 5 described later. The part is to be moved.

The film transporting means 5 comprises a pair of upper and lower rotatable endless belts 51 which are arranged side by side so that the end on the film holding means 4 side can be opened and closed, and a belt on the side facing the endless belt 51. A clamp 52 for holding the front end of the film F by moving the film holding means 4 to the endless belt 51 side, and at the same time, moving the film holding means 4 of the endless belt 51 together. The film F cut into a predetermined length by the film cutting means 6 described later by moving the end of the
Due to the rotation of the endless belt 51, the center position immediately below the wrapping portion 1 matches the center position of the film F (centering).
To be transported. The endless belts 51 provided opposite each other form a guide 53 and a guide shaft.
The film cut in accordance with the size of the article to be packaged W is stretched in the width direction by using a narrow film F (pre-stretch).
It has become.

The film cutting means 6 includes a cutter unit 601 and
A receiving portion 602 is provided, and is controlled so that the film F, which is being held and conveyed by the film transport means 5, is cut into a predetermined length at a predetermined timing according to the size of the article W to be packaged. The cutter unit 601 is shown in FIGS. 3 and 4 (1).
As shown in the figure, a cutter 603 is screwed into a cutter 603 which is formed in a saw-like shape and which is
Support rod 604 for supporting 03 and connecting rod installed between machine frames
A rod of a solenoid 606 of a type that is provided in series at 605 at a predetermined interval and retracts when voltage is applied has an L-shape, and the L-shaped bent portion is pivotally supported so as to be rotatable. And at the end of the rod,
A tension spring 608, one end of which is fixed to the connecting rod 605, is hooked. The cutter 601 is provided below the film transport path and between the film holding means 4 and the film transport means 5. Are provided so that the cutting edge is perpendicular to the film surface and crosses the film F at an acute angle to the film advancing direction. The cutter unit 601 thus configured moves forward in an acute angle direction with respect to the film advancing direction while maintaining the cutting edge of the cutter 603 perpendicular to the film surface by the pulling movement of the solenoid 606 via the link 607. The film F being transported is cut. The component in the film transport direction of the forward speed (cutting speed) of the cutter is designed to be the same as or similar to the transport speed of the film, and there is almost no relative difference from the transport speed of the film. It becomes a straight line and an extremely good film cut portion can be obtained.

The receiving portion 602 is provided with a frame body 6 which can be opened and closed and is provided at a position facing the cutter portion 601 with the film F interposed therebetween.
An L-shaped stay 610 is provided to protrude inside the interior of the housing 09, and a solenoid 611 capable of reciprocating by forward and reverse application is provided at the top of the stay 610. Its solenoid
A link 612 having an L-shape and rotatably supporting the L-shaped bent portion is connected to the tip of the rod of 611, and even if the film F abuts on the tip of the link 612. A sponge 613 having a rectangular cross section is provided on the inner surface of the opening so as not to damage the film F, and a receiving body 614 having a U-shaped cross section for inserting a cutter into the opening is provided. The reciprocating operation of the solenoid 611 causes the receiving main body 614 to move toward and away from the film cutting position.

The discharge pusher 7 is configured to be movable above the rear folding plate 11b in the same direction as the rear folding plate 11b, and to push the package W at the same time when the left and right folding and the rear folding are completed. Then, the package W is forward folded by the front folding rod 12, and the packaged object W is carried out onto the heater conveyor HC for heat-sealing the end of the film folded into the lower surface of the packaged product W.

The wrapping operation of the wrapping machine A constructed as described above will be briefly described. The leading end of the film F pulled out from the film roll is held by the film holding means 4 and is placed on the endless belt 51 side of the film transport means 5. Simultaneously with the movement, the end of the endless belt 51 on the film holding means 4 side is opened and closed to hold the leading end of the film F, and the transfer of the film F is started by the rotation of the endless belt 51. At the same time, the film holding means 4 immediately returns to the original position when the delivery of the film is completed. (At this time, the cutter part 601
And the receiving section 602 are in the standby state shown in FIG. 3 and FIG. Then, as shown in FIG. 4 (2), when the length required for packaging the article to be packaged W is reached, the endless belt 51 is not stopped, and the cutter 603 of the cutter section 601 is moved with respect to the film surface. At the same time, the film F is advanced at an acute angle at a speed having no relative difference from the transfer speed of the film F while maintaining the vertical position, and at the same time, the film F is cut by approaching and positioning the film position where the receiving body 614 of the receiving portion 602 is cut. Done instantly and quickly cutter
The 603 and the receiving body 614 are separated from each other, and return to the original standby state.

The film F cut to a predetermined length in this manner is transported to the packaging section 1 by the film transport means 5, and the film F cut according to the size of the article to be packaged is stretched in the width direction and held. At the same time, the article to be packaged W moved directly below the packaging section 1 by the conveyor section 2 is pushed up by the elevator head 302 via the elevating rod 304 onto the stretched and held film F of a predetermined length, Packaged item W
Is covered with a film F. And left and right folding board
By moving the 11a and the rear folding plate 11b and releasing the film clamp at the same time, the film edge is folded into the lower surface of the packaged object, leaving only one side in the unloading direction. Then, the elevator head 302 descends and pushes the article W to be wrapped by the discharge pusher 7 so that the above-mentioned front folding rod 12 is moved.
At the same time, the film is conveyed onto the heater conveyor HC, and the end of the film folded on the lower surface of the packaged object W is heat-sealed to complete the packaging.

In the present embodiment, the cutter and the receiver are driven by a solenoid, but the invention is not limited to this, and it is optional to use an air cylinder, a motor, or the like . Et al is subjected is also optional be the moving locus of the body to the movement trajectory and the target of the cutter, when the receiving body exhibited illustrated U-shaped cross section in this embodiment, formed of the opening Even if the width is short, it is possible to receive it, which can contribute to downsizing of the device. Further, in the present embodiment, the film transport means for transporting the film to the packaging unit is of a type in which both edges in the film width direction are sandwiched between a pair of upper and lower transport belts provided on both sides in the film width direction. However, a type in which the end of the film to be cut (in the longitudinal direction rather than the width direction) is gripped and pulled out to a predetermined position may be used, and furthermore, a packaging machine in which an electronic balance and a label attaching device are combined is used. It is a good thing.

[0026]

As described above, the present invention has the following advantageous effects. According to the first aspect, the film transfer means transfers the film drawn from the film roll to the packaging unit, and the cutter in which the cutter blade is held substantially perpendicular to the film without stopping the film being transferred is provided. Since the film is cut by moving linearly in an acute angle direction to the film advancing direction, it is possible to obtain a clean cutting edge without a risk of film tearing, and to provide the film cutting means in a narrow space. .
According to the second aspect, the reciprocating movement of the cutter is reduced by providing the receiving portion provided to face the cutter portion with the film interposed therebetween and capable of receiving and moving the cutter for cutting the film, thereby easily cutting the film. In addition, since the receiving portion can be moved toward and away from the film surface of the cutting portion, the receiving portion does not hinder the drawing of the film by being separated during the drawing of the film. According to claim 3, baffle and does not become the passing film be spaced in full Irumu drawer. According to the fourth aspect, in the case of a packaging machine for packaging a prepackaged object by stretching the cut narrow film in the width direction according to the size of the object to be packaged (prestretching), the film cut during film transfer. Even if the amount of pre-stretch is increased, the cut edge is clean and there is no risk of film tearing, and a stretch packaging machine with high processing capacity can be provided.

[Brief description of the drawings]

FIG. 1 is a vertical side view showing an outline of a packaging machine.

FIG. 2 is a longitudinal sectional front view of the same.

FIG. 3 is a plan view of a main part.

FIG. 4 is (1) a side view in FIG. 3; (2),
The operation state figure following (1).

[Explanation of symbols]

A: Stretch wrapping machine FR: Film roll F:
Film 1 ... Packing unit 5 ... Film transfer means 6 ... Film cutting means W
… Packaged object 601… Cutter 603… Cutter 602… Receiving part
4: Film holding means

Claims (4)

(57) [Claims] 1. A and film transport means were drawn from the film roll film is stretched holding the packaging unit, Phil
Hold the leading edge of the film unwound from the
Transfer the leading end of the film to the entrance of the film transfer means.
Film holding means for moving and delivering, and the film holding means
Cutting means disposed between the means and the film transfer means, for cutting the film having reached a predetermined length, and wrapping the object to be packaged with the film of the predetermined length transferred to the packaging section and stretched and held. In the stretch wrapping machine, the film cutting means is held so that the cutter edge is substantially perpendicular to the film, and can move in an acute angle direction to the film advancing direction and reciprocate in a straight line crossing the film. A stretch packaging machine comprising a cutter, wherein the cutter is reciprocated during the transfer of the film to cut the film. 2. The film cutting device according to claim 1, wherein the film cutting means includes a receiving portion provided opposite to the cutter with the film interposed therebetween and capable of receiving and moving the cutter for performing the film cutting. Stretch wrapping machine. When wherein spaced said cutter portion and the receiving portion, a stretch of claim 2, wherein the film holding means is controlled so as to transfer the film to the film transport means to move Packaging machine. 4. The packaging apparatus according to claim 1, wherein the film transport means is configured to be movable toward and away in the width direction of the film, and stretches the cut narrow film in the width direction in accordance with the size of the packaging object. The stretch wrapping machine according to any one of claims 1 to 3, wherein the stretching wrapping is performed.