JP3002127B2 - Film switching delivery device in stretch film packaging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film switching / delivery device for selectively transporting a plurality of films to a film transport device in a stretch film packaging machine.

[0002]

2. Description of the Related Art As shown in FIG. 1 of Japanese Unexamined Patent Publication No. 6-183417, in a film feeding device 2 on both right and left sides of a packaging machine main body 1, as shown in FIG. The film gripper 3B holding the arm 5
5a, the film F is advanced from the standby position P4 to the supply position P5, and the film F is supplied to the entrance 60 of the film feeder 6 at the supply position P5, and the film gripper 3B is moved from the supply position P5 to the standby position P4. fall back.

[0003]

As described above, since the film gripper 3B is reciprocated with the rotation of the arm 55a and the film F is transferred to the film feeder 6, the transfer is performed. The structure of the mechanism becomes complicated.

[0004] It is an object of the present invention to provide a simple film switching and delivery apparatus in a stretch film packaging machine.

[0005]

The stretch film packaging machine according to the first invention comprises the following film transport device, a plurality of film setting devices, and a film switching device. In the film transport device, the goods are packed
A transport mechanism is provided on each side of the packaging section, and both transport mechanisms are provided with film retraction guides on both sides in the film transport direction, and the leading end of the film loaded from any one of the film retraction guides is provided. The film is fed to the packaging section at the normal film transport speed with both sides sandwiched. Each film setting device is provided with a film winding roll. In the film switching device, a first film delivery mechanism and a second film delivery mechanism for holding and holding the leading end of the film drawn from each of the film setting devices are connected to each of the film retraction guides, and It is provided on both sides in the film transport direction with the transport device sandwiched therebetween, and the leading end of the film is selectively carried out to the film transport device.

Further, in the above-mentioned film transport apparatus, both transport mechanisms are provided so that a film delivery direction from the first film delivery mechanism to the packaging section, a film return direction from the packaging section to the first film delivery mechanism, and Transport mechanism driving means that can be operated in a film sending direction from the second film sending mechanism toward the packaging section and in a film returning direction from the packing section toward the second film sending mechanism.

Further, the film switching device has a delivery mechanism driving means for synchronously driving each of the film delivery mechanisms of the film switching device and the two transport mechanisms of the film transport device.

Further, the following arrangement is provided for controlling the transport mechanism driving means and the delivery mechanism driving means. In the film switching device, each film delivery mechanism moves away from the film standby position in the film delivery direction, and the film transport device delivers each film.
Said film at a predetermined position up to the film delivery position in each film retraction guide portion of the side to be connected to the mechanism
A film leading end detection sensor for detecting the leading end of the film pulled out from the setting device is provided.

The film sending discrimination means selects which of the film sending mechanisms of the film switching device should be stopped or driven when the film is switched.

[0010] In the control means, the film delivery synchronously driven with both transport mechanism of the first film delivery film transport device a mechanism selected film switching device based on stop discrimination signal by the discrimination means, the film to return the leading portion from the film delivery position to the film waiting position, controls the conveying mechanism drive means and delivery mechanism driving means. Further, the synchronization and is driven with both transport mechanism of the second film delivery mechanism of the film delivery based on a driving determination signal by the discrimination means selected film switching device film transport device, the film waiting position to the film tip as out-feed to the film delivery position from controlling the transport mechanism drive means and delivery mechanism driving means. Then, based on the detection signal from the film leading end detection sensor, the sending drive by the transport mechanism driving means and the sending mechanism driving means is terminated.

The second invention has the following configuration added to the first invention. During film switched, before the film tip
A serial film delivery back film back from the position to the film waiting position speed, the film tip was sent to the film delivery from the film waiting position to the film delivery position and velocity, so as to lower than the normal film transport speed And control means for controlling the transport mechanism driving means and the delivery mechanism driving means. The third invention is the first invention
The following configuration is added to the light or second invention. The control hand
Steps are provided for the transport mechanism driving means and the delivery mechanism driving means.
Return operation to the film front end is completed.
After that, the interval between the two transport mechanisms is adjusted to the second film feeding machine.
Be sure to set the interval according to the film width set on the framing side
Then, the width adjusting motors of the two transport mechanisms are drive-controlled.
The fourth invention may fall under any of the first to third inventions.
The above configuration is added. The control means is optimal for each article
The width of the film,
Based on optimal film width selected by product code
Film width or second fill on the first film delivery mechanism side
Which of the film widths on the
Select the appropriate one and drive the film delivery mechanism on the selected side.
It is controlled to move. The fifth invention is the first invention to the third invention.
The following structure is added to any of the inventions. Said
When an article is supplied to the packaging section, the dimensions of the article are
The control means
Is the first film delivery mechanism side and the second film delivery
Maximum dimensions of articles that can be packaged in advance for each film width on the mechanism side
Method is entered as a program and the article detection
Calculating the dimensions of the article based on the detection signal from the
Larger than the size of the article and smaller than the maximum size
Select the film width corresponding to the
The film feed mechanism on the side is controlled to be driven.
The sixth invention may include any of the first to third inventions.
The above configuration is added . An article is supplied to the packaging section
At this time, an article detection sensor that detects the dimensions of the article before packaging
The control means may further include a filter selected in advance.
With respect to the interval of the transport mechanism, which is adjusted according to the
The size of the article based on the detection signal of the article detection sensor.
This film delivery mechanism is selected when
Is controlled so that only the film is forcibly fed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a film supply device for a stretch film packaging machine according to an embodiment of the present invention will be described with reference to the drawings.

The film supply device shown in FIGS.
A film transport device A, a film switching device B, and a film setting device C are provided. Note that a horizontal direction along the film transport direction R shown in FIG. 2 is a left-right direction, and a horizontal direction orthogonal to the film transport direction R is a front-rear direction.

[Mechanical Structure of Film Conveying Apparatus A shown in FIGS. 1 and 2 and FIGS. 5 to 7] (Mainly the movable conveying mechanism 1a and the fixed conveying mechanism 1b shown in FIGS. 1, 2 and 5) Packaging The film transport mechanism 1 is provided on both front and rear sides of the section S. The transport mechanism 1 includes a movable transport mechanism 1a provided in front of the packaging section S and a packaging section S.
And a fixed-side transport mechanism 1b provided on the rear side of.

On both left and right sides of the packaging section S, both front and rear machine frames 2,
Male screw rods 4 and 5 are rotatably supported between the three. A movable frame 6 is provided between the front portions of the left and right male screw rods 4 and 5, and female screw portions 7 attached to the lower left and right sides of the movable frame 6 are screwed to the male screw portions 4a and 5a. . A fixed frame 8 is installed between the rear portions of the left and right male screw rods 4 and 5 and attached to the rear machine frame 3. Male screw rods are attached to bearing portions 9 attached to the lower left and right sides of the fixed frame 8. 4 and 5 are rotatably supported.

Upper and lower shafts 10 and 11 and lower shafts 12 and 13 are rotatably supported at both left and right ends of the movable frame 6 and the fixed frame 8, respectively. Pulleys 14 and 15 are supported so as to be integrally rotatable, and pulleys 16 and 17 are attached to the left and right lower shafts 12 and 13.
Are supported so as to be integrally rotatable. An upper transport flat belt 18 is stretched between the left and right upper pulleys 14 and 15 via intermediate pulleys 14a and 15a, and extends in the lateral direction along the film transport direction R in the packaging section S. A lower transport timing belt 19 is stretched between the left and right lower pulleys 16 and 17, and also extends in the left and right direction along the film transport direction R to contact the upper transport flat belt 18. I have. Left and right pulleys 1
The belt 1 wound between the belts 18 and 19 wound on the belts 4 and 16 and on the upper and lower pulleys 15 and 17 on the right side
Between the positions 8 and 19 are film retraction guides 20 and 21 on both sides of the packaging section S in the film transport direction R.

(Mainly the transport mechanism driving means 2 shown in FIGS. 6 and 7)
2) Drive shafts 23 and 24 are rotatably supported between the front and rear machine frames 2 and 3 below the left and right ends of the movable frame 6 and the fixed frame body 8. Drive shaft 23,
Pulleys 25, 26 are attached to the rear end of 24. A servo-type film transport drive motor 27 which is controlled to be rotatable forward and backward is attached to the inside of the rear side machine frame 3, and a pulley 28 attached to an output shaft of the servo-type drive motor 27 and the left and right A drive timing belt 29 is stretched between the pulleys 25 and 26 via intermediate pulleys 30 and 31.

Left and right upper shafts 10 and 11 and left and right lower shafts 1 of the movable transfer mechanism 1a and the fixed transfer mechanism 1b.
The rotation of the left and right drive shafts 23 and 24 is controlled by a gear 32 attached thereto, the two gears 33 and 34 attached to the left and right lower shafts 12 and 13, and the left and right upper shafts. 10,11
Is transmitted through a gear 35 attached to the motor.

Therefore, the rotation of the servo drive motor 27 causes the transport flat belt 18 and the transport timing belt 19 to rotate. (Mainly, the transport mechanism width adjusting drive means 36 shown in FIG. 6) Sprockets 37, 38 are attached to the rear ends of the left and right male screw rods 4, 5 outside the rear machine frame 3. This rear side machine frame 3
Width adjustment motor 3 controlled to be rotatable forward and backward inside
9, the sprocket 40 and the left and right sprockets 3 attached to the output shaft of the width adjusting motor 39.
7 and 38, the chain 41 is an intermediate sprocket 4
2 is passed over. Then, rotation of the width adjusting motor 39 is performed by the right and left male screw rods 4 via the chain 41.
5, the movable side transport mechanism 1a is moved by the female thread portion 7 along the male thread portions 4a and 5a, and approaches and separates from the fixed side transport mechanism 1b.

A potentiometer 43 is attached to the outside of the rear machine frame 3 adjacent to the width adjusting motor 39, and a gear 44 interlocked with the potentiometer 43 and a gear 45 attached to the sprocket 40 are provided. Are engaged. The rotation of the width adjusting motor 39 is controlled by the potentiometer 4.
3 is transmitted.

(Film pressing mechanism 46 shown in FIG. 1) The film pressing mechanisms 46 of the movable side transport mechanism 1a and the fixed side transport mechanism 1b move the upper and lower belts 1 during film transport.
The film 88 is sandwiched between 8, 19,
A central pressing portion 47, lateral pressing portions 48 on both left and right sides thereof, and a pressure receiving plate 49 above the pressing portions 47, 48 are provided. The central pressing portion 47 and the horizontal pressing portion 48 have solenoids 50, 51, respectively. Are connected via parallel crank mechanisms 52, 53. The central pressing portion 47 and the lateral pressing portion 48 sandwich the upper and lower belts 18 and 19 with respect to the pressure receiving plate 49 by the solenoids 50 and 51.

[Mechanical Structure of Film Switching Apparatus B shown in FIGS. 1 to 4 and FIGS. 5 to 7] (Mainly, film feeding mechanisms 54 and 55 shown in FIGS. 1 to 5)
The left and right film delivery mechanisms 54 and 55 have the same structure and are connected to the left and right film retraction guides 20 and 21 of the movable transport mechanism 1a and the fixed transport mechanism 1b, and sandwich the film transport device A. Are provided on both sides in the film transport direction R.

A lower fixed shaft 56, a lower rotating shaft 57, and a lower fixed shaft 58 are sequentially arranged side by side from the film retraction guide portions 20, 21 and are bridged between the front and rear machine frames 2, 3. The two fixed shafts 56 and 58 have grooved rollers 59, respectively.
61 is rotatably supported. This lower rotating shaft 57
A saw blade 60 is attached so as to be integrally rotatable. Above the grooved rollers 59, 61 and the saw blade 60, a manual opening / closing frame 62 is supported by the front and rear machine frames 2, 3 by a support shaft 62a so as to be vertically rotatable. In the opening / closing frame 62, an upper grooved roller 63 is provided above the lower grooved roller 59.
Are rotatably supported. This lower grooved roller 5
A comb tooth 64 is inserted into 9, and the upper grooved roller 63 is in contact with the lower grooved roller 59 across the comb tooth 64. Comb teeth 65 are attached to the open / close frame 62 on the saw blade 60, and the rotation locus of the saw blade 60 passes through the comb teeth 65.

The lower rotating shaft 57 to which the saw blade 60 is attached
A slit plate 66 (having one circular slit formed on its circular outer periphery) is attached to the inside of the rear side machine frame 3, and the photoelectric switch 67 detects the slit of the slit plate 66.

In the movable transport mechanism 1a and the fixed transport mechanism 1b, the left and right ends of the movable frame 6 and the left and right ends of the fixed frame 8 are located above the left and right film draw-in guides 20, 21 respectively. On their inner parts facing each other,
Film tip detection sensors 68 and 69 (photoelectric switches) are attached.

(Sending mechanism driving means 70 mainly shown in FIGS. 6 and 7) Near the front ends of the left and right driving shafts 23 and 24 in the transport mechanism rotation driving means 22, a clutch brake 71a, The rotation of both left and right drive shafts 23 and 24 is transmitted to gears 71 and 73 via gears 72 and 73. The rotation of the output side of the clutch brakes 71a, 71b is controlled by the pulley 74, the timing belt 75, and the pulleys 76, 77.
9, 61.

The clutch brakes 71a, 71
The rotation on the output side of b is transmitted to the input sides of the clutches 81a and 81b via the pulley 78 integrated with the pulley 74, the timing belt 79, and the pulley 80. The rotation on the output side of the clutches 81a and 81b is transmitted to the lower rotation shaft 57 provided with brakes 82a and 82b.

Therefore, by the rotation of the servo drive motor 27, both the lower grooved rollers 59, 61 rotate via the clutch brakes 71a, 71b, and the saw blade 60 rotates via the clutches 81a, 81b.

[Mechanical Configuration of Film Setting Apparatus C shown in FIGS. 1 and 6 to 7] The film setting apparatus C is provided below the left and right film feeding mechanisms 54 and 55, respectively, and has a setting shaft 83.
have. A film winding roll 84 is attached to the set shaft 83. This film winding roll 8
A lever 85 is provided on the inside of the rear frame 3 below the support shaft 85a.
The lever 85 is rotatably supported in the vertical direction.
A pressing roller 86 is rotatably supported by a support shaft 86a at the distal end of the pressing roller 86. A tension coil spring 87 on the rear side machine frame 3 is connected to the lever 85, and a film feeding and pressing roller 86 is pressed against a film winding roll 84 by its elastic force. A film 88 pulled out from the film take-up roll 84 is wound around both guide rollers 89 and 90.

The left and right film delivery mechanisms 54, 55
The rotation of the grooved roller 61 at
, A pulley 93, a round belt 94, pulleys 95 and 96 attached to the support shaft 85a, a round belt 97, and a pulley 98 attached to the support shaft 86a. To be transmitted.

[Electrical Configuration of Each Apparatus A, B, and C] The article detection sensor 99 shown in FIG. 8 measures the size W of the article 102 shown in FIG. (Dimensions in a direction perpendicular to the film transport direction R) before the packaging. Incidentally, in the automatic switching mode described later, the detection of the article size W and the detection of whether or not the article 102 has been supplied are performed.
In the product code-specific operation mode described later, only the supply of the article 102 is detected, and the article size W is not detected.

The conveying mechanism width adjusting drive means 3 shown in FIG.
Potentiometer 4 linked to width adjusting motor 39 of 6
3 detects the position of the movable side transport mechanism 1a. FIG.
A rotary encoder 27a (film feed amount detecting means) is attached to the servo drive motor 27 of the transport mechanism driving means 22 shown in FIG. The rotary encoder 27a transmits a pulse according to the rotation speed of the servo drive motor 27. The servo drive motor 27 is controlled by a servo amplifier 27b.

The controller 100 shown in FIG. 8 is built in a control box (not shown), and operation keys 101 connected to the controller 100 are provided outside the control box.

Although not described in detail, the controller 100 includes a central processing unit (CPU), a read-only memory (ROM) in which predetermined programs and the like are stored in advance, and a random access memory (RA) for temporarily storing calculation results of the CPU and the like.
M), a backup RAM for storing data stored in advance, and the like, and a logical operation circuit configured by connecting these with an external input circuit and an external output circuit via a bus.

As shown in FIG. 8, the external input circuit includes the article detection sensor 99, the potentiometer 43, the photoelectric switch 67 and the film leading end detection sensor in the left and right film sending mechanisms 54 and 55. 68, 69 and the rotary encoder 27a are connected. The external output circuit includes the width adjusting motor 39, the servo amplifier 27b, the clutch brakes 71a and 71b, the clutches 81a and 81b, and the brakes 82a and 82b in the left and right film delivery mechanisms 54 and 55. Is connected. Then, the controller 100 receives the article detection sensor 99, the potentiometer 43, and the photoelectric switch 6 through an external input circuit.
7, signals from the film leading edge detection sensors 68 and 69, the rotary encoder 27a and the operation keys 101 are read as input values, and based on these input values, the width adjusting motor 39 and the servo amplifier 27 are output via an external output circuit.
b, clutch brakes 71a, 71b, clutch 81
a, 81b and brakes 82a, 82b.

[Regarding Various Processing Operations Executed by Controller 100] (Operation mode for each product code performed when the packaging machine is stopped shown in FIG. 9A) First, in the left and right film setting devices C shown in FIG. Film winding roll 84 to film 8
Pull out 8. Next, in the left and right film sending mechanisms 54 and 55 of the film switching device B, the opening / closing frame 62 is opened upward, the film 88 is placed on the lower grooved roller 61, and then passed under the comb teeth 65, and the comb teeth 64 are passed through. Put on top. Then, the opening and closing frame 62 is closed downward, and the film 8 is closed.
8 with the lower grooved roller 59 (see FIG. 5).
And the upper grooved roller 63 (the initial setting position of the leading end of the film).

Next, in the left film delivery mechanism 54,
Width H of the film 88₁Data on the right side fill
Width H of the film 88 in the film delivery mechanism 55_TwoAbout
Input data with the operation keys 101,
The rollers 100 have their width H ₁, H_TwoData corresponding to
(Set film width detecting means).

Next, the optimum film width H ₀₁ in each article 102 to be conveyed, H _02, H _03, ... also operation key 1 H _0n
01, the controller 100 has its width H
₀₁ , H ₀₂ , H ₀₃ ,... H _0n are stored (optimum film width storage means).

Next, when a product code corresponding to the article 102 to be packaged is input using the operation keys 101, the data of the optimum film width stored in the controller 100 is selected.

Although not described in detail, the controller 100 sets the set film width H ₁ of the left film 88 and the set film width H ₂ of the right film 88 according to the optimum film width H _on selected based on the product code. It is determined which of the two is optimal. For example, a film having a set film width equal to or more than the optimum film width H _0n and close to the optimum film width H _0n is selected. Thereafter, when the operator turns on the start switch, the subsequent operations are performed.

First, the case where the set film width H ₁ of the left film 88 is selected will be described. In this case, since the leading end portions 88a of the left and right films 88 are at the initial set position, they are not detected by the film leading end detection sensors 68 and 69, and it is determined that both the film leading end portions 88a are at the later-described film standby position P. It is set so that a film return operation, which will be described later, is not performed for the film on the side not selected.

The controller 100 stores the interval N (see FIG. 2) between the two film transport mechanisms 1 for each film width, and stores the potentiometer 43 on the width adjusting motor 39.
Based on a signal from the controls to drive the same motor 39 so that the interval N in conjunction with the width H ₁ of the left film 88.

The controller 100, the output to the servo-type drive motor 27, a predetermined one corresponding to the time of the film transport speed V _E usual and it slower also given film delivery speed V _F and a predetermined film return speed V _One corresponding to _G is stored. Then, the controller 100 engages and releases the clutch of the clutch brake 71a in the left film sending mechanism 54, and releases the clutch.
When the servo drive motor 27 is driven after the clutch is disengaged and the brake is actuated for the clutch brake 71b in 5, the film transport device A and the left film delivery mechanism 54 are driven in synchronization with each other. The controller 100 is equivalent to the rotational speed by controlling the servo amplifier 27b based on a signal from the rotary encoder 27a of the servo-type drive motor 27, the corresponding rotation speed of the servo-type drive motor 27 to a predetermined film delivery speed V _F I try to make it. Therefore, FIG.
As shown in FIG.
Tip 88a of the left film 88 is fed to the film delivery direction F ₁ at low speed (film delivery speed V _F).

Thereafter, the leading end 88a of the left film 88
As shown in FIG. 5 (a), the film leader portion from the initial set position the film delivery direction F ₁ to distant of the conveying mechanism 1 film feed in and left the film pull guide portion 20 of the way to the position Q it reaches the predetermined position Q _1.
It left the film tip detecting sensor 68 at the predetermined position Q ₁
Detects the leading end 88a of the left film 88, the controller 100
After a predetermined time (for a predetermined pulse inputted from the rotary encoder 27a), the servo drive motor 27 is stopped, and the film transport device A and the left-side film sending mechanism 54 are stopped based on the signal from the controller. Therefore, FIG.
As shown in FIG.
Stops at the film delivery position Q.

Thereafter, the packaging machine automatically starts the idle operation (excluding the film transport). Next, when the article 102 supplied by the worker is detected by the article detection sensor 99 and the detection signal is input to the controller 100, the controller 100 performs the same control as the servo-type drive motor 27.
The rotation speed to match the rotational speed corresponding to the normal film transport speed V _E. Then, the tip portion 88a of the left film 88 in the film delivery position Q is sent to the packaging section S toward at normal film transport speed V _E to the feed direction E _1. When the left film 88 is fed by a predetermined length based on the number of pulses from the rotary encoder 27a, the controller 100 engages the left clutch 81a, releases the left brake 82a, and starts transmitting rotation to the rotating shaft 57. Then, based on the signal from the photoelectric switch 67 that has detected the slit of the slit plate 66, the rotation shaft 57 is rotated once from the standby position to disengage the left clutch 81a and operate the left brake 82a. Therefore, the saw blade 60 perforates the left side film 88 only by one rotation. Then, when the controller 100 releases the clutch of the clutch brake 71a and activates the brake, the rotation of the left film feeding mechanism 54 stops, and the left film 88 pulled out from the left film take-up roll 84 moves along the perforation. Be cut off. At this time, the film cutting tip 88 from the left film take-up roll 84
The rotation stop timing of the left film sending mechanism 54 is set so that a stops at the film sending position Q. Further, the servo drive motor 27 continues to rotate for a film transport distance based on a previously input film cut length. Then, the left film 88 cut to a predetermined length stops at the center of the packaging unit S.

When the article 102 rises in this film supply state, the cut film 88 is lifted by the article 102 in the packaging section S. Next, the film 88 is folded under the article 102 to complete the packaging.

Conversely, when the controller 100 is
88 set film width H_TwoIf you select
(B) As shown in FIG.
Similar operations are performed on the film 88. This place
In case, film sending direction F₁Is the film sending direction F_Two
And is suitable for film supply E₁Is suitable for film supply E
_TwoCorresponds to.

(Film Switching in the Product Code-Specific Operation Mode) On the other hand, the leading end 88a of the left film 88
Is switched to the right side film 88 when is in the delivery position Q, the switching is performed as follows.

Based on the product code, the controller 100
But if you select the set film width of H ₂ right film 88, selects whether to stop or drive those which of the film switching device B of the left and right film delivery mechanism 54 and 55.

Next, when the start switch is turned on, the controller 100 synchronizes the left film sending mechanism 54 of the film switching apparatus B selected based on the stop determination signal with the two transport mechanisms 1 of the film transport apparatus A. and is driven, as shown in FIG. 5 (b), the tip portion 88a of the left film 88 is returned at a low speed from the film delivery position Q to the film back direction G ₁ (film return speed V _G).

[0051] Thereafter, as shown in FIG. 5 (b), the the film waiting position during the predetermined position Q ₁ leading to P, the left film tip detecting sensor 68 detects the leading end portion 88a of the left film 88, the controller 100 stops the servo drive motor 27 after a predetermined time (for a predetermined pulse inputted from the rotary encoder 27a) based on the signal from the film leading edge detection sensor 68,
The film transport device A and the left side film delivery mechanism 54 are stopped. Therefore, as shown in FIG. 5B, the leading end 88a of the left film 88 stops at the film standby position P.

Next, the controller 100 controls the drive of the width adjusting motor 39 so that the distance N between the two film transport mechanisms 1 (see FIG. 2) according to the set film width H ₂ of the right film 88.

Further, the controller 100 drives the right-side film delivery mechanism 55 of the film switching apparatus B selected based on the drive discrimination signal in synchronization with the two transport mechanisms 1 of the film transport apparatus A in the same manner as described above. Then, the film leading end 88a is sent to the film sending position Q. Thereafter, the packaging machine automatically starts the idle operation, and performs the same operation as that described above.

The above-mentioned film switching is the same when the tip 88a of the right film 88 is switched to the left film 88 when the leading end 88a is at the film sending position Q. In this case, the film returns direction G ₁ is applicable to the film back direction G _2.

The pressing roller 86 cooperates with each of the film feeding mechanisms 54 and 55, and assists the feeding of the film 88 during the film feeding and the normal film transport. Further, when the film is returned, the film 88 is rewound to prevent its slack.

(Packing Function in Operation Mode by Product Code During Operation of Packaging Machine) Referring to FIG. 9B, FIG.
The following description focuses on the differences from FIG. When a product code corresponding to another article 102 to be packaged is input using the operation keys 101 during operation of the packaging machine (during idle operation), the controller 1
00 performs the use film determination (if you select the set film width H ₁ of the left film 88). And
When the article 102 is supplied and detected by the article detection sensor 99, and the detection signal is input to the controller 100, the packaging machine decelerates and stops.

Next, the leading end 88a of the right film 88 is rewound from the film delivery position Q of the film transport mechanism 1 as described above. Next, the interval N between the film transport mechanisms 1 is set according to the width of the selected left film 88.

Next, the leading end 88a of the selected left side film 88 is sent out at a low speed as described above and stopped for a predetermined time after being detected by the leading end detecting sensor 68 of the film transport mechanism 1. .

Subsequently, the normal film transport speed V
_E , the film transport mechanism 1 and the left side film delivery mechanism 54 are driven synchronously, and the cut film 8 is cut.
8 is conveyed to the center of the packaging section S. Then, when the packaging machine is automatically started, the article 102 rises toward the cut film 88 and is carried out after packaging.

On the other hand, the same applies when packaging is performed using the right film 88 instead of the left film 88. (Automatic switching mode) Referring to FIG.
The differences from (b) will be mainly described.

In the operation mode for each product code, the article 1
The optimum film width H _0n about 02 controller 100
And store it, and then select a product code. In this automatic switching mode, the controller 1
00 is the maximum dimension W ₁ , of the wrappable article 102 which is preprogrammed for each set film width H ₁ , H ₂ .
To select the W _2. Then, the start switch is turned ON.
Next, when the worker supplies the article 102, the article 102 is detected by the article detection sensor 99, and the controller 10.
The detection signal is input to 0. The controller 100 calculates the dimension W _{0 of the} article 102 based on the signal from the article detection sensor 99, and proceeds to use film determination. For example, a set film width larger than the dimension W _{0 of the} article 102 and corresponding to the smaller one of the maximum dimensions W ₁ and W ₂ is selected.

(Fixed Mode) Although not shown, in the fixed mode, one of the left film 88 and the right film 88 is selected, and the film is transported with the distance adjusted according to the selected left film 88 or right film 88. with respect to the spacing N of mechanism 1, only if small size W ₀ of the supplied articles 102, so that feeds only preselected film forces.

This embodiment has the following features (a) to (f). (A) Each film retraction guide 2 of the film transport device A separated from the film standby position P in each of the film delivery mechanisms 54 and 55 to the film delivery directions F ₁ and F ₂ .
The film leader portion 88a at a predetermined position to Q ₁ up to the film delivery position Q by using the film tip detecting sensors 68, 69 for detecting the 0,21, doing film switching as described above. Therefore, the film switching delivery device in the stretch film packaging machine can be simplified.

[0064] (b) when the film switched, and the film return speed V _G in the case of the return to terminate the drive to return the film leader portion 88a from the film delivery position Q to the film waiting position P, and the film tip 88a film waiting film delivery speed V _F when the delivery ends the drive by sending from the position P to the film delivery position Q is,
To normal when the film is slower than the conveying speed V _E Naruru so,
It is controlled by the controller 100. Therefore, when the film is transferred from the film switching device B to the film transport device A, the initial film transport position after the switching (the film standby position P and the film delivery position Q) is reliably performed to prevent the bending of the film leading end portion 88a. At the same time, the film can be transported smoothly and the packaging operation can be performed efficiently.

[0065] and (c) a film transporting device A and the film switching device B, usually during film transport speed V _E or from even low speed (film return speed V _G, the film delivery speed V _F) in synchronization with each other by driving Therefore, the film transport initial positioning after the switching (the film standby position P, the film delivery position Q) and the subsequent film transport can be smoothly performed.

[0066] (d) at the time of film switching, in the course of the predetermined position Q ₁ which leads to the film waiting position P or the film delivery position Q, if the film leader portion 88a film tip detecting sensor 68, 69 detects, the film leading end After a predetermined time (for a predetermined pulse input from the rotary encoder 27a) based on the signals from the section detection sensors 68 and 69, the film transport device A and the film delivery mechanism 5
4, 55 are stopped. Therefore, if the predetermined time is set accurately, the leading end 88a of the film 88 can be reliably stopped at the film standby position P or the film delivery position Q.

(E) Each film delivery mechanism 54, 55
, The film leading end detection sensors 68 and 69 for detecting both side portions of the film leading end 88a are connected to both the film transport mechanisms 1 (near the film retraction guide sections 20 and 21 of the movable transport mechanism 1a and the fixed transport mechanism 1b). Is provided. For this reason, the film leading end portion 8 sandwiched between the upper and lower belts 18 and 19 by the film retraction guide portions 20 and 21.
8a can be detected near both sides. Therefore, for example, at the time of film delivery, the film leading end 88
In the incomplete state sandwiched between the upper and lower belts 18 and 19 while one side of the both sides is bent, the operation does not shift to the normal film transport operation, thereby preventing a defective film transport. can do.

(F) The film transport mechanism 1 feeds both sides of the film 88 between the upper and lower belts 18 and 19. The film delivery mechanisms 54 and 55 feed the film 88 by the rollers 59, 61 and 63. Therefore, the film transport mechanism 1 and the film delivery mechanisms 54 and 55 can be simplified.

In addition to the above embodiment, the following (a) to (c)
It may be configured as follows. In (i) above embodiment, at a predetermined position to Q ₁ between the film waiting position P and the film delivery position Q, the film leader portion 88a film tip detecting sensor 68, 69 is detected. Instead of this configuration, the film delivery position Q
Substantially coincide with the predetermined position Q ₁ and. In this case, the film leading end 88a stops near the film delivery position Q.

(B) Each film delivery mechanism 54, 55
In the above, one film front end detection sensor 6 is provided so that only the center between both sides of the film front end 88a can be detected by the film front end detection sensors 68 and 69.
Install 8,69.

(C) A motor is used instead of the clutch brakes 71a, 71b, the clutches 81a, 81b, and the brakes 82a, 82b, which are synchronous driving means for the film transport mechanism 1 and the film delivery mechanisms 54, 55.

The technical ideas (other than the claims) that can be grasped from each embodiment are described together with the effects. (B) In the first or second aspect, when returning the film leading end portion 88a from the film sending position Q to the film standby position P, the film leading end portion detecting sensors 68, 6 are provided.
And control means (controller 100) for terminating the return drive by the transport mechanism drive means 22 and the delivery mechanism drive means 70 based on the detection signal from the control mechanism 9. Therefore, the leading end 88a of the film 88 can be reliably stopped at the film standby position P.

[0073]

According to the stretch film wrapping machine of the present invention, since the film is switched using the film leading end detection sensor, the film switching and sending device can be simplified.

[0074] In particular, according to the second invention, when the full Irumu switching, since the by controlled so that slower than the film return speed and the film delivery speed and the normal film transport speed, at the time of film delivery, switching The initial positioning of the subsequent film transport can be reliably performed to prevent the bending of the leading end of the film, and the film can be transported smoothly to perform an efficient packaging operation.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a film supply device according to an embodiment.

FIG. 2 is a schematic plan view showing the same film supply device.

FIG. 3 is a partially enlarged plan view of FIG. 2;

FIG. 4 is a partially cutaway plan view of FIG. 3;

FIG. 5 is a partially enlarged sectional view of FIG. 1;

FIG. 6 is a schematic diagram showing a drive system of the film supply device.

FIG. 7 is a drive system diagram of the film supply device.

FIG. 8 is an electric block diagram of the film supply device.

FIG. 9 is an operation process diagram of the film supply device.

[Explanation of symbols]

 1 .... conveying mechanism, 20, 21 ... film retraction guide section, 2.
2 ... Conveying mechanism driving means, 54, 55 ... Film feeding machine
Structure, 68, 69 ... film leading edge detection sensor, 70 ... feeding
Unwinding mechanism driving means, 84 ... Film winding roll, 88 ...
Film, 88a: Film tip, A: Film transport
Equipment, B: film switching device, C: film set equipment
Placement, S: packaging part, R: film transport direction, E₁, E_Two…
Suitable for film supply, F₁, F_Two... Film sending direction,
G₁, G_Two… Film return direction, V _E… Normal film
Transport speed, V_F… Film delivery speed, V_G…the film
Return speed, P: Film standby position, Q: Film delivery
Position, Q₁... predetermined position, 100 ... controller (fill
Transmission determination means, control means).

Continuation of the front page (72) Inventor Seiwa Inoue 4-380 Nakaodai, Nishi-ku, Nagoya-shi, Aichi Fujikikai Co., Ltd. Nagoya Works (56) References JP-A-9-2420 (JP, A) JP-A-8-58733 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65B 57/00-57/20 B65B 41/00-41/18

Claims (6)

(57) [Claims] 1. A transport mechanism (1) is provided on both sides of a packaging section (S) in which articles are packed , and both transport mechanisms (1) are provided.
Are provided with film retraction guides (20, 21) on both sides in the film transport direction (R), respectively, and both sides of the film (88) whose leading end is carried in from any one of the film retraction guides (20, 21). A film transport device (A) for feeding the film to the packaging portion (S) at a normal film transport speed (V _E ), a plurality of film setting devices (C) for mounting a film winding roll (84), A first film delivery mechanism (54) and a second film delivery mechanism (5) for holding the film leading end (88a) pulled out of the film setting device (C) and holding it.
5) are connected to the respective film retraction guides (20, 21) and provided on both sides in the film transport direction (R) with the film transport device (A) interposed therebetween, and the film leading end (88a) is selected. And a film switching device (B) for unloading the film to a film transport device (A), wherein both transport mechanisms (1) of the film transport device (A) are connected to a first film delivery mechanism ( packaging unit from 54) (S) to the towards the film delivery direction (F ₁₎ and the packaging unit (S) the first film delivered from and towards the mechanism (54) film return direction (G _1), and the second film feed The operation is performed in the film sending direction (F ₂ ) from the sheet feeding mechanism (55) to the packaging section (S) and in the film returning direction (G ₂ ) from the packaging section (S) to the second film sending mechanism (55). Transfer mechanism Driving means (22), both transport mechanisms (1) of the film transport device (A), and respective film delivery mechanisms (54, 5) of the film switching device (B).
5) and a delivery mechanism driving means (7)
0), and the film sending directions (F ₁ , F ₁ ) from the film standby position (P) in each of the film sending mechanisms (54, 55).
Away to _2), the fill in said film transport device (A)
Said film at a predetermined position (Q ₁₎ of each film retraction guide portion of the side to be connected to the arm delivery mechanism (54, 55) in (20, 21) to the film delivery position (Q)
The leading end of the film (8
8a), a film leading end detection sensor (68, 6)
9) and a film sending discrimination means (100) for selecting which of the film sending mechanisms (54, 55) of the film switching device (B) to stop or drive at the time of film switching; The first film delivery mechanism (54) of the film switching device (B) selected based on the stop determination signal by the film delivery determination means (100) is connected to the film transport device (A).
Synchronously driven with both transfer mechanism (1) of the film leader portion to return said (88a) film delivery position from the (Q) to the film waiting position (P), the transport mechanism drive unit (22) And a control means (100) for controlling the feeding mechanism driving means (70); and a second film feeding mechanism of the film switching device (B) selected based on a drive discrimination signal from the film feeding discriminating means (100). (55) is a film transport device (A)
Of synchronization with both transfer mechanism (1) is driven, so that out-feed the film leader portion (88a) to the from the film waiting position (P) off <br/> Irumu delivery position (Q), the transport A control means (100) for controlling a mechanism driving means (22) and a delivery mechanism driving means (70); and a transport mechanism driving means (22) based on a detection signal from the film leading end detection sensor (68, 69). And a control means (100) for terminating the sending drive by the sending mechanism driving means (70). At 2. A film switching, the film tip (88a) of the film delivery position (Q) returned from to the film waiting position (P) film return speed (V _G)
When the film leading end portion of said (88a) from the film waiting position (P) film delivery position (Q) delivered to the film delivery speed to (V _F), the normal film transport speed (V _E) than 2. A control means (100) for controlling said transport mechanism driving means (22) and said delivery mechanism driving means (70) so as to delay said driving mechanism.
5. A film switching and sending device in a stretch film packaging machine according to item 5. 3. The transfer device according to claim 2, wherein
The structure drive means (22) and the delivery mechanism drive means (70)
Return operation to the film leading end (88a)
After completion, the interval (N) between the two transport mechanisms (1) is
The filter set on the second film delivery mechanism (55) side
The two transport mechanisms are spaced so as to correspond to the width of the
The drive control of the width adjusting motor (39) in (1) is performed.
The stretch film according to claim 1 or 2,
A film switching delivery device in a packaging machine. 4. The control means (100) includes an article (10)
2) For each optimum film width (H ₀₁ , H ₀₂ , H ₀₃ ,…
H _0n ) To be stored and packaged (102)
Optimal film width selected by product code
(H _0n ) Based on the first film delivery mechanism (54)
Film width (H ₁ ) Or the second film delivery mechanism (5
5) Side film width (H _Two )
Select the appropriate one, and select the film delivery mechanism (5
4, 55) is driven.
The stretch fill according to any one of claims 1 to 3.
A film switching delivery device in a film packaging machine. 5. An article (102) is provided in said packaging section (S).
When supplied, the dimensions of the article (102) (W ₀ A) packaging
Further provided is an article detection sensor (99) for detecting in advance. The control means (100) includes a first film delivery mechanism.
(54) side and the second film delivery mechanism (55) side
Film width (H ₁ , H _Two ) Can be pre-packaged for each item (10
2) Maximum dimensions (W ₁ , W _Two ) Is programmed
Both are based on the detection signal from the article detection sensor (99).
Based on the dimensions (W ₀ )
The dimensions of the article (102) (W ₀ Larger than and before
The maximum dimensions (W ₁ , W _Two ) Corresponding to the smaller of
Film width (H ₁ , H _Two ) To select the file on the selected side.
Control to drive the LUM delivery mechanism (54, 55).
The method according to any one of claims 1 to 3, wherein
Switching feed in a stretch film wrapping machine
Out device. 6. An article (102) is provided in the packaging section (S).
When supplied Product (102) dimensions (W ₀ A) packaging
Further provided is an article detection sensor (99) for detecting in advance. The control means (100) operates on a preselected film.
The interval (N) of the transport mechanism (1) adjusted according to the interval
In response to the detection signal of the article detection sensor (99).
Size (W) ₀ ) When this is small
The selected film delivery mechanism (54, 55)
Control to forcibly extend only the film.
The stress according to any one of claims 1 to 3,
A film switching delivery device in a film packaging machine.