JPH0732412Y2 - Film switching device for stretch wrapping machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is provided with two stretch film rolls having different width dimensions or different types or the same, and of the films fed from the two stretch film rolls. The present invention relates to a film switching device that switches from one film to another film in a stretch wrapping machine that selects either one and wraps an article in the selected film.

[Prior art]

Conventionally, a film switching device for a stretch wrapping machine, which has two stretch film rolls, selects one of the two stretch film rolls according to the size of the article to be wrapped, and wraps the article As an example,
Japanese Patent Application No. 61-199260 filed earlier by the applicant of the present application
No. 63-55028) disclosed in the specification and drawings. The film switching device of this stretch wrapping machine is composed of a pair of pressure-bonding rollers that press the two surfaces of two types of film having different widths so that the surfaces of the two types of films face each other and are pressure-bonded between the rollers, and between the pressure-bonding rollers. It consists of a shutter that can be inserted and retracted between two types of film, and a cutter that is placed facing each other and cuts or punches the two types of film between them, and is currently used when switching films. The film surface to be used next is pressed against the existing film surface with a pressure roller, the two kinds of films are pulled out by a predetermined amount in a state of being stacked, and the shutter is inserted between the two kinds of film surfaces. Is cut or perforated by a cutter, and two kinds of films that have been pressure-bonded are transferred to switch the films.

[Problems to be solved by the device]

However, in the above film switching device, since the shutter and the pressure roller are in pressure contact with each other when the film is fed (fed), the surface of the shutter is roughened (for example, sandblasting) to make it difficult for the film to adhere to the shutter. Then, there is a problem that the shutter is warped to cause the pressure roller to come into a one-sided contact, and when the film is transferred, the film is biased to deteriorate the finish of the packaging. Further, there is a drawback that the cost increases if the secondary processing for removing the warp of the shutter is performed.

The present invention has been made in view of the above points, and an object of the present invention is to provide a film switching device that surely functions even if the processing accuracy of the shutter component is poor.

[Means for Solving the Problems]

The present invention for solving the above, two stretch film roll (F _1, F ₂₎ is set substantially parallel to the film supply section (100) comprises, the two stretch film roll (F _1, Film (f ₁ , f ₂ ) fed from F ₂ ).
Of the currently used film, the other film end to be selected is brought into close contact face-to-face and fed out by a predetermined amount, and then the currently used film is cut to hold the end, and the currently used film is used. Two stretch film rolls (F ₁ , F ₂ ) in a film switching device of a stretch wrapping machine that switches from one film to another
A plate-like shutter (223) that is drawn out from the film and moves up and down between the films facing each other, and a film holding device that holds the end faces of the cut films that face each other across the vertical movement path of the shutter (223). A pair of film holding members (203, 205) having surfaces and a pair of film adhesive members facing each other across the vertical movement path of the shutter (223) and contacting and separating in conjunction with the downward movement of the shutter (223). (20
9,210) and a pair of cutters (207, 208) located above the upper end of the shutter (223) in the upper moving position and facing each other with both films facing each other, interlocking with the downward movement of the shutter (223). Then the film adhesive (209,2
10) are brought close to each other, and one of the two stretch film rolls (F ₁ , F ₂ ) is stretched above the upper end of the shutter (223) in the lower position and the other stretch is applied to the film surface currently in use. After the film end surface held by the film holding surface (203a or 205a) of one film holding plate (203 or 205) drawn from the film roll is brought into close contact, both films are drawn by a predetermined amount, and the shutter (223) To move one of the cutters (207, 208) above the upper end of the shutter (223) to cut the film (f ₁ or f ₂ ) currently in use, and to interlock with the cutter (207 or 208) Film holding plate (203,20
5) One of the film holding surfaces (203 or 205) of the film holding plate (203 or 205) is operated by operating one of the cut film end surfaces.
Or 205b) and then the cutter (207 or 208)
The film holding plate (203 or 205) is returned to its original state and the film is switched.

Further, the pair of film adhesive members have a film pressing surface for pressing the film existing therebetween, and the film pressing surfaces are arranged so as not to face each other when the pair of film adhesive members approach each other. It is characterized by

Further, the pair of cutters (207, 208) and the film holding plates (203, 205) are attached to a cutter attachment frame (213, 214) which rotates about an axis, and the cutter solenoid (2
It is characterized by moving forward and backward toward the film (f ₁ , f ₂ ) by turning on and off (17,218).

Further, the pair of film adhesive members (209, 210) is characterized in that the film adhesive faces (209, 210) are rotated about an axis and are urged by elastic members (215, 216) so that the film pressing surfaces are separated from each other.

Also, the cam plate (211,2) is attached to the film adhesive member (209,210).
02) is attached, and the cam plate (2
When the shutter (223) descends, the cam plate (211,202) rides on the surface of the shutter (223) and the film adhesive member (209,210) rotates about the axis. When the pressing surface approaches at least until the shutter (223) rises, the cam plate (211,202) is inserted into the cam hole, and the film adhesive member (209,210) rotates about the axis by the elastic member (215,216). However, the film pressing surfaces are separated from each other.

[Operation] By configuring the film switching device of the stretch wrapping machine as described above, when the film is fed, the film holding surface of the film holding plate is separated from the shutter, so that one-sided contact is eliminated due to the warp of the shutter. ,
The film is reliably fed to a predetermined position without meandering. Further, since the mechanism can surely perform the operation even if the processing accuracy of the parts such as the warp of the shutter is poor, the parts processing does not require time and the cost is low.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 are views showing the structure of a film switching device of a stretch wrapping machine according to the present invention. FIG. 1 is a side view of the film switching device, and FIG. 2 is a detailed side view of the film switching unit 200. FIG. 3 is a plan view of the film switching unit 200, and FIG. 4 is a front view of the film switching device.

The film switching device includes a film supply unit 100 that sets a stretch film roll and supplies the film, a film switching unit 200 that switches the film, and a film payout transfer unit 300 that pays out and transfers the film.

The film supply unit 100 includes support rollers 101 and 102 and support rollers.
A stretch film roll F ₁ having a small width is mounted on the supporting rollers 101 and 102, and a stretch film roll F ₂ having a large width is mounted on the supporting rollers 103 and 104. A belt 114 is suspended between the support rollers 101 and 102 and is rotated by receiving a driving force from the drive roller 106. A belt 115 is suspended between the support rollers 103 and 104 and the drive roller 10 is rotated.
It is designed to be rotated by getting driving force from 5.

The drive roller 105 and the drive roller 106 are rollers with an electromagnetic clutch, and when the electromagnetic clutch is turned on, a driving force is obtained from the belt 113 to rotate.

Further, reference numeral 107 in the figure denotes a stopper plate which supports both ends of the stretch film roll F ₁ , which can be rotated around a support shaft 107a and is fixed to the contact plate 111 by a magnet 109. Further, 108 is also a stopper plate that supports both ends of the stretch film roll F ₂ , and can rotate about the support shaft 108a.
It is fixed to the contact plate 112 by the magnet 110.

The film switching unit 200 includes guide rollers 201 and 202, guide rollers 204 and 206, film holding plates 203 and 205, and a shutter 22.
3, equipped with cutters 207, 208, film adhesive members 209, 210 and the like.

Guide rollers 201 and 202 are stretch film rolls F ₁ and F
Roller to guide the film from ₂ upwards, shaft 2
It is rotatably supported by 01a and 202a.

The film adhesive members 209 and 210 are each made of a resin material,
As will be described later, they have film pressing surfaces 209b and 210b, respectively, and are fixed to the film adhesive member attachment members 209a and 210a. The guide roller 204 and the film adhesive member mounting member 209a are rotatably supported by a shaft 204a.
Further, the film adhesive member mounting member 210a to which the guide roller 206 and the film adhesive member 210 are mounted is also rotatably supported by the shaft 206a.

Also, cam plates 211 and 212 are attached to the lower portions on both sides of each of the film adhesive member attachment members 209a and 210a.

In addition, the film adhesive members 209 and 210 are respectively coil springs 21.
5 and 216, the predetermined rotation direction, that is, the film adhesive member 209
The film pressing surfaces 209b and 210b of the respective Nos. 210 and 210 are urged in the directions to be separated from each other. The coil spring 21
5 and 216 may be elastic members other than the coil spring.

The cutter 207 and the film holding plate 203 are integrally attached to the upper end of the cutter attachment frame 213, and the other end of the cutter attachment frame 213 is rotatably supported by the shaft 204a. The cutter 208 and the film holding plate 205 are integrally attached to the upper end of the cutter attachment frame 214, and the other end of the cutter attachment frame 214 is supported by the shaft 206a. The cutter mounting frame 213 includes links 221, 221, which are attached to both ends thereof, and a connecting shaft 21 for connecting the links 221, 221.
Via 9 are connected to cutter solenoids 217, 217 arranged at both ends of the connecting shaft 219.

Further, the cutter mounting frame 214 has links 222, 222 attached to both ends thereof and a connecting shaft for connecting the links 222, 222.
Via the 220, it is connected to the cutter solenoids 218, 218 arranged at both ends of the connecting shaft 220.

When the cutter mounting frame 213 rotates about the shaft 204a and the film holding surface 203a of the film holding plate 203 of the cutter 207 hits the shutter surface of the shutter 223, the cutter 207 and the film holding plate 203 have a tip end of the cutter 207. Is attached so as to stop beyond the upper end of the shutter 223 by protruding a predetermined amount to the opposite side. Similarly, the cutter mounting frame 214 of the cutter 208 and the film holding plate 205 has a shaft 206a.
The film holding surface 205 of the film holding plate 205
When 05a hits the shutter surface of the shutter 223, the tip of the cutter 208 exceeds the upper end of the shutter 223 and projects to the opposite side by a predetermined amount and stops.

The film holding plates 203 and 205 are made of a resin material as described above, the tips thereof are formed in a comb tooth shape, and the tip surfaces thereof are the film holding surfaces 203a and 205a, and the film holding surfaces 203a and 205a are Each is buffed to make the film easier to hold.

If the film holding plates 203, 205 are attached to the cutter attachment frames 213, 214 separately from the cutters 207, 208 via elastic members such as compression springs, when the cutters 207, 208 are operated, the tips of the cutters 207, 208 are more protruded to ensure film cutting. In addition to this, the elasticity of the elastic member such as a spring presses the film holding surfaces 203a and 205a against the film, so that the film can be securely held by adhesion.

The film adhesive member attachment members 209a and 210a are plate members each having a L-shaped cross section, and the comb-shaped film adhesive members 209 and 210 formed of a resin material are attached to the L-shaped surface. The film pressing surface 2 of the film adhesive member 209, 210
09b and 210b are arranged so that they do not face each other.

The shutter 223 is a film holding plate 203 arranged to face each other.
And 205 and between the film adhesive members 209 and 210, a plate-like member that moves up and down by a coil spring 228 attached to both ends of the shutter 223 and a shutter drive solenoid 227 attached to both ends of the shutter 223. , Solenoid 227,2 for shutter drive via shutter mounting plate 233
It is connected to 27 plungers 227a, 227a.

The cam plates 211 and 21 are provided at predetermined portions on both ends of the shutter 223.
A cam hole 224 through which 2 is inserted is formed.

Belts 231 and 232 are suspended on the guide rollers 201 and 202, respectively, and coil springs 22 are provided on both ends of the belts 231 and 232.
Install 9,229 and 230,230. Accordingly, in the guide rollers 201 and 202, the belts 231 and 232 have the coil springs 229,
229 and 230, 230 are pulled to guide rollers 201 and 202
It has a structure to maintain the stop state. That is, the film from the stretch film roll F ₁ or F ₂ f ₁ or f ₂
The guide roller 201 or 202 is moved to the belt 231
Alternatively, the coil springs 229 and 229 or the springs on one side of the coil springs 230 and 230 are stretched because they rotate by slipping with the belt 232. Therefore, when the feeding of the film f ₁ or f ₂ is stopped, the guide roller 201 or 202 is slightly reversely rotated by the elasticity of the stretched coil spring 229 or 230 to maintain the rotation stop.
Or, since the tension of the film can be generated and maintained between 202, the cutting or perforation by the cutters 207 and 208 is surely performed, and the film pre-stretching is performed to generate the tension in the film during the film feeding. Is done to improve the finish of the packaging.

The coil springs 229 and 230 may be other elastic members such as rubber as long as they have elasticity.

The cutters 207 and 208 are arranged to face each other,
Film f ₁ and f ₂ of the between the stretch film roll F ₁ and F ₂ is transported along the surface of the shutter 223. By energizing the cutter driving solenoid 217, the plunger rises, whereby the cutter mounting frame 213 rotates counterclockwise around the shaft 204a and the cutter 207 moves.
The film f ₂ is cut by projecting the film forward.

Also, by energizing the cutter driving solenoid 218, the plunger rises, and the cutter mounting frame moves to the shaft 20.
The film f ₂ is cut by rotating clockwise around 6a and protruding the cutter 208 forward. Cutter 207,20
Cutter blade 207a when 8 is rotated, 208a is a film f ₁ or f ₂
Acts near the top surface of shutter 223 to ensure disconnection.

Next, the film feeding / transporting unit 300 includes a film feeding roller 301, a film guiding unit 302, a film transporting unit 303, and the like.

Film feeding rollers 301 is a roller for feeding pulling the film f ₁ and f ₂ from the stretch film roll F _1, F _2, a surface so that the film surface is brought into close contact with the roller surface are smoothly processed.

The film guiding portion 302 is a portion that guides the film fed by the film feeding roller 301 to the film transport portion 303, the timing belt 304 suspended by the timing pulleys 305 and 306, and the presser foot arranged above these timing belts 304. The film, which is composed of a plate 307 and the like, has passed through the film feeding roller 301 and is guided to the film transfer unit 303 through between the timing belt 304 and the pressing plate 307. The film feeding / transporting units 300 having the above-described configuration are arranged side by side in the width direction of the film.

Since the film guiding section 302 is described in detail in the specification and screen of Japanese Utility Model Application No. 60-99943 filed by the applicant earlier, detailed description thereof will be omitted here.

The film transfer unit 303 includes a chain conveyor 309, a round rubber belt 308 suspended around the chain conveyor 309, and a plurality of grippers 3 attached to the chain conveyor 309.
A film made of 10 or the like and cut into a predetermined length is sandwiched between the round rubber belt 308 and the plurality of grippers 310, and is conveyed to the packaging position of the article. Regarding the film transfer section 303, Japanese Patent Application No.
Since it is described in detail in the specification and the drawings of 9-182465, its detailed description is omitted here.

311 is a reversible rotation motor, and the reversible rotation motor 311 rotates the screw gear 312 forward and backward. The threaded gear 312 is meshed with a threaded rod 313 having opposite threads formed on both sides, and by rotating the threaded rod 313 in the normal direction and the reverse direction, the film transfer portions 303 and 303 are arranged side by side in the width direction of the film. You can adjust the distance between and. That is,
Film transfer unit 30 according to the width of the film used
The distance between 3 and 303 can be adjusted.

Each of the film transfer units 303 includes a chain conveyor 30
Support members 314, 314 fixed to a frame body (not shown) of 9,309
Is provided, and the gap is adjusted in conjunction with the gap adjustment of the film transfer units 303, 303.

The movement of the film transfer unit 303 is performed by a detection mechanism including a detection piece 318 that moves by engaging a mounting plate 315 attached to an end portion of the support member 314 and a plurality of transmission type detectors that detect the detection piece 318. Detected. The details of the detection mechanism are disclosed in the specification of Japanese Patent Application No. 61-199260 and the application filed by the applicant of the present invention, and the details are omitted here. The operation of the film switching device will be described below.

FIGS. 5 to 9 are views showing a state in which the film from the film supply unit 100 is sent to the film delivery transfer unit 300 through the film switching unit 200.

FIG. 5 is a diagram showing a state in which the packaging machine is using the film f ₂ from the stretch film roll F _2, the film f ₂ from the stretch film roll F _2, the guide rollers
The film is passed through the space 202 between the shutter 223 and the guide roller 204, further through the guide roller 235, and is transported by the film delivery roller 301 to the delivery transfer unit 300.
Tip of the film f ₁ from the time stretch film roll F ₁ is held by the film holding surface 205a of the film holding plate 205.

The film in this state from the film f ₂ of stretch film roll F ₂ of stretch film roll F ₁ film f ₁
Shutter switch solenoid 227 to O
Then, when the shutter 223 is lowered, the cam plates 211 and 212
Is pressed by the shutter 223, so that the film adhesive members 209 and 210 cause the coil springs around the shafts 204a and 206a.
It rotates against the elasticity of 215 and 216. At this time, the film f ₁ which is adhesively held on the film holding surface 205a of the film holding plate 205 is the film pressing surface 210 of the film adhesive member 210.
It is separated from the film holding surface by pressing a, and the film pressing surfaces 209a and 210a are engaged with each other.
pressed against the f ₁ and the film f ₂ becomes a state of being adhered to the film f ₂ (I see FIG. 6). At this time, the film adhesive member 209
Since the film pressing surfaces 209b and 210b of 210 and 210 are arranged in a comb-like shape and displaced from each other as shown in FIG.
The film f ₁ and the film f ₂ are in surface contact with each other to increase the bonding area and securely bond.

In this way, the film pressing surface 209b and the film pressing surface 210b
Since the film f ₁ and the film f ₂ are not directly sandwiched between them, the method disclosed in the Japanese Patent Application No. 61-199260 filed by the present applicant and the drawings is directly sandwiched between the pressure rollers. By comparison, processing and adjustment of the film adhesive members 209 and 210 and the film pressing surfaces 209b and 210b are simplified. That is, in the one disclosed in Japanese Patent Application No. 61-199260 and the drawings, since the film is directly sandwiched between the pressure bonding rollers, it is necessary for the pair of pressure bonding rollers to uniformly contact with each other. Should be placed in parallel,
In addition, it was necessary to process the pressure roller surface with high processing accuracy. Also, since the shutter and the pressure roller are in pressure contact with each other when the film is transported (feed), if the surface of the shutter is roughened to prevent the film from sticking to the shutter, the shutter will warp and the pressure roller will not contact one side. turn into. On the other hand, in the case of the present embodiment, the shutter 223 may be warped, and the film pressing surface 2
Film f ₁ and film f ₁ are placed between 09b and the film pressing surface 210b.
_{Since the 2} is not directly sandwiched, the film pressing surfaces 209b and 210b
The processing accuracy of the film adhesive members 209 and 2 may be low.
The placement accuracy of 10 may be low.

With film f ₂ and film f ₁ adhered,
When the shutter driving solenoid 227 is turned off when f ₁ and f ₂ have been transferred by a predetermined amount, the shutter 223 is pulled up by the coil spring 228 and moves up to return to the initial position, and the cam plates 211 and 212 move the cams of the shutter 223 to the cams. Hole 224
, The film adhesive members 209 and 210 are pulled by the coil springs 215 and 216 and are rotated about the shafts 204a and 206a in the directions away from each other,
The film pressing surfaces 209a and 210a are separated from each other and return to their intended positions (see FIG. 7).

Next, the transfer of the films f ₁ and f ₂ is stopped, and the cutter solenoid 217 is set to 0N. As a result, the cutter mounting frame 213 rotates counterclockwise about the shaft 204a, and the cutter 2
07 cuts the film f ₂ and the film holding plate 203
The film holding surface 203a presses the cut lower part of the film f ₂ against the surface of the shutter 223. As a result, the film f ₂ is adhesively held on the film holding surface 203a (see FIG. 8).

Next, the cutter solenoid 217 is set to 0FF and the cutter 207 is returned to the initial position. As a result, the leading end of the film f ₂ is adhesively held on the film holding surface 203a of the film holding plate 203 (see FIG. 9). Subsequently, the film f ₁ and the cut film f ₂ are transported by a predetermined amount, the adhesive portion between the film f ₁ and the film f ₂ is removed, and the film f ₁ of the stretch film roll F ₁ can be used.

It can be carried out in substantially the same operation even when switching from the film f ₁ from a stretch film roll F ₁ on the film f ₂ of stretch film roll F _2.

[Effect of device]

As described above, the film switching device of the stretch wrapping machine according to the present invention has the following excellent effects.

By configuring the film switching device of the stretch wrapping machine as described above, when the film is fed, the film holding surface of the film holding plate is separated from the shutter, so one-sided contact is lost due to the warpage of the shutter. It is reliably sent to a predetermined position without meandering, and the packaging finish of the packaging machine is improved.

Further, since the mechanism can surely perform the operation even if the processing accuracy of the parts such as the warp of the shutter is poor, the parts processing does not take time and the cost is reduced.

[Brief description of drawings]

1 to 4 are views showing the structure of a film switching device of a stretch wrapping machine according to the present invention. FIG. 1 is a side view of the film switching device, FIG. 2 is a detailed side view of the film switching portion, and FIG. FIG. 3 is a plan view of the film switching unit, FIG. 4 is a front view of the film switching device, and FIGS. 5 to 9 are views showing the operation of the film switching unit. In the figure, 100 ... film supply unit, 200 ... film switching unit, 203,205 ... film holding plate, 204, 206 ... guide roller, 207, 208 ... cutter, 209, 210 ... film adhesive member, 211, 212 ... cam plate, 224 ... … Cam hole, 223 …… Shutter, 300 …… Film feeding and transport section.

Claims (5)

[Scope of utility model registration request] 1. Two stretch film rolls (F ₁ ,
It is equipped with a film supply unit (100) for setting F ₂ ) substantially parallel to each other, and is currently used among the films (f ₁ , f ₂ ) fed from the _two stretch film rolls (F ₁ , F ₂ ). One of the films to be selected is brought into close contact with the other film end portion on the body surface and fed out by a predetermined amount, and then the currently used film is cut to hold the end portion thereof, In a film switching device of a stretch wrapping machine for switching to the other film, a plate-shaped shutter (223) that is fed from the _two stretch film rolls (F ₁ , F ₂ ) and moves up and down between opposed films. A pair of film holding plates (203, 205) having a film holding surface that holds the end surfaces of the cut films, facing each other with the vertical movement path of the shutter (223) interposed therebetween, Shutter (223) pair of film adhesive member across the up-down movement path approaching and moving away from in conjunction with the downward movement on the movement of opposing the shutter (223) each other (209,21
0) and a pair of cutters (207, 208) located above the upper end of the shutter (223) in the upper moving position and facing each other with both facing films sandwiched therebetween. The film adhesive members (209, 210) are moved close to each other in an interlocking manner, and are fed from one of the two stretch film rolls (F ₁ , F ₂ ) above the upper end of the shutter (223) in the down position. After adhering the film end face held by the film holding surface (203a or 205a) of the one film holding plate (203 or 205) fed out from the other stretch film roll to the film surface in use, The two films are fed by a predetermined amount, the shutter (223) is moved upward, and the cutter (2
07,208) is operated to cut the film (f ₁ or f ₂ ) currently in use, and the other film holding plate (203, 205) is linked with the cutter (207 or 208).
The film holding surface (203a or 203a of the film holding plate (203 or 205)
The film switching device is characterized in that the film is switched by holding the cutter (207 or 208) and the film holding plate (203 or 205) back after being held by 205b). 2. The pair of film adhesive members have film pressing surfaces for pressing a film existing therebetween, and the film pressing surfaces are displaced so as not to face each other when the pair of film adhesive members approach each other. The film switching device for a stretch wrapping machine according to claim (1), wherein the film switching device is arranged. 3. The pair of cutters (207, 208) and film holding plates (203, 205) are attached to a cutter attachment frame (213, 214) which rotates about an axis, and the film is turned on / off by turning a cutter solenoid (217, 218) on and off. A film switching device for a stretch wrapping machine according to claim (1) or (2), characterized in that it moves forward and backward toward f ₁ and f ₂ ). 4. The pair of film adhesive members (209, 210)
Rotates about an axis and is an elastic member (215,216)
Of the stretch wrapping machine according to claim (1), (2) or (3), characterized in that the film pressing surfaces are urged by the Film switching device. 5. A cam plate (211,202) is attached to the film adhesive member (209,210), and the shutter (223).
And a cam hole through which the cam plate (211, 202) is inserted, and when the shutter (223) is lowered, the cam plate (211, 20)
2) rides on the surface of the shutter (223) and the film adhesive member (209, 210) rotates about the axis and approaches until the film pressing surface at least coincides with the shutter (22
When 3) rises, the cam plate (211, 202) is inserted into the cam hole, and the film adhesive member (209, 210) is moved by the elastic member (2
15,216) pivots about an axis, and the film pressing surfaces are separated from each other. Claims (1) or (2) or (3) or (4) ) The film switching device of the stretch wrapping machine according to the item.