JPH04279410A - Film feeder in packing machine - Google Patents

Abstract

PURPOSE:To prevent the deformation of an article by constituting an apparatus in such manner that the separation position of a movable gripping member is controlled on the basis of an input signal from an article width selection means and drawing of a film is hindered on the basis of an input signal from a brake timing selection means. CONSTITUTION:An apparatus is provided with brake means 15, 16 for hindering drawing of a film 2a from a wind-up roll 2, driving means for causing a movable gripping member 4 to come close to and separate from a fixed gripping member 3, means for selecting the width of an article 68 to be packed and means for selecting the drive timing of the brake means 15, 16. Then, the driving means is driven and stopped on the basis of an input signal from the article width selection means to control the separation position of the movable gripping means 4 for the fixed gripping means 3 and the brake means 15, 16 are driven on the basis of an input signal from the brake timing selection means to control drawing of the film 2a by a controller.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supplying a packaging film to a packaging section of a packaging machine for fresh foods, for example.

0002

2. Description of the Related Art Conventionally, this type of packaging machine is known, for example, as disclosed in Japanese Patent Application Laid-Open No. 132984/1984. The film supply device of this packaging machine includes a fixed gripping member (see Figure 7 of the same publication) that grips the leading end of the film pulled out from the film take-up roll, and a fixed gripping member that approaches and moves away from the fixed gripping member. A movable gripping member that grips the tip of the film on the member (see Figures 9 and 10 of the same publication)
and is provided. As shown in Figures 8 and 12 of the same publication, a brace is rotatably supported near the fixed gripping member, and a presser plate is attached to the upper end of the brace. Then, when the film is pulled out from the fixed gripping member by the movable gripping member, the article holder rises, the film is lifted by the article to the packaging section, and the article is covered with the film from above.

However, in the case of flexible articles, if the tension of the film is too strong, there is a risk that the article will deform when the film is lifted.

0004

[Problems to be Solved by the Invention] As described above, the conventional problem is that the article may be deformed depending on the flexibility of the article and the degree of tension of the film, and the present invention solves the problem of adjusting the tension of the film. The purpose is to prevent deformation of the article by making it possible to do so.

[0005]

[Means for Solving the Problems] As shown in the drawings of the embodiments described later, the packaging machine includes a film supply device 1 that supplies a film 2a to a packaging section S, and an article receiving table 66 that moves up and down with respect to the packaging section S. It is equipped with The film supply device 1 includes a fixed gripping member 3 and a movable gripping member 4.
is the film 2a pulled out from the film take-up roll 2
The movable gripping member 4 approaches and moves away from the fixed gripping member 3 to grip the leading end of the film 2a on the fixed gripping member 3. Furthermore, the packaging machine includes brake means 15, 16 for preventing the film 2a from being pulled out from the take-up roll 2.
, 17, a driving means 43 for moving the movable gripping member 4 toward and away from the fixed gripping member 3, a means 70 for selecting the width of the article 68 to be packaged, and a drive timing T17 of the brake means 15, 16, 17. means 71. The control unit 69 drives and stops the drive unit 43 based on the input signal from the article width selection unit 70 to remove the fixed gripping member 3.
The separation position of the movable gripping member 4 relative to the movable gripping member 4 is controlled. The control section 69 drives the brake means 15, 16, and 17 based on the input signal from the brake timing selection means 71 to prevent the film 2a from being pulled out.

The brake timing selection means 71 selects the article tray 6 from a timing earlier than the stop timing T43 at which the movable gripping member 4 controls the drive means 43 so that the movable gripping member 4 pulls out the film 2a from the fixed gripping member 3 and stops.
The drive timing T17 can be selected in a plurality of stages within the region E up to a timing earlier than the highest timing T66 of No. 6.

[0007]

[Operation] In this way, in the present invention, since the driving timing T17 of the brake 17 can be changed in multiple stages within a certain area E, the article 68 is
The resistance provided to article 68 when lifting can be adjusted. Generally, the more flexible the article 68 is, the later the drive timing T17 of the brake 17 is, the less tension the film 2a will have as the article 68 rises, and the less resistance will be applied to the article 68.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, the film supply device 1 shown in FIGS. 1 and 2(a) and 2(b) will be described in detail. This film supply device 1 includes a fixed gripping member 3 that grips the leading end of a film 2a pulled out from a film take-up roll 2, and a leading end of the film 2a located on the fixed gripping member 3 that approaches and is spaced from the fixed gripping member 3. A movable gripping member 4 for gripping the parts is provided.

The left and right side plates 5 of the fixed gripping member 3 are fixed inside the left and right machine frames 6, and a comb-shaped fixed gripping plate 7 is attached between the both side plates 5. A movable arm 8 is supported on both side plates 5 so as to be rotatable in the vertical direction about a support shaft 9, and a comb-shaped movable gripping plate 1 is disposed between the tips of both movable arms 8.
0 is attached. Both movable arms 8 are biased by a torsion coil spring 11 on the support shaft 9, and due to the biasing force, a movable grip plate 10 between both movable arms 8 is pressed against the fixed grip plate 7 from below. . An operating arm 12 is attached to one movable arm 8, and by pushing down the operating arm 12, both movable arms 8 and the movable grip plate 10 rotate downward against the biasing force of the torsion coil spring 11. , both gripping plates 7,1
0 open to each other.

A pair of upper and lower shafts 13 and 14 are supported between both side plates 5 and between both movable arms 8, and the upper shaft 13 supported by the side plates 5 is rotatable and is supported by the movable arms 8. The lower shaft 14 is fixed. A cylindrical holding roller 15 is fitted onto the upper shaft 13 so as to be rotatable therewith. A holding roller 16 is rotatably fitted to the lower shaft 14. Both nipping rollers 15 and 16 are pressed against each other by the biasing force of the spring 11. One end of the upper shaft 13 protrudes to the outside of the machine frame 6 and is connected to a brake 17 attached to the outside of the machine frame 6. The leading end of the film 2a passes between both the pinching rollers 15 and 16, and then passes between the two pinching plates 7.
, 10.

Above both gripping plates 7 and 10, both side plates 5
A knife insertion member 18 having a cutting groove 18a is attached therebetween. A rotating shaft 19 is supported inside the machine frame 6 adjacent to the fixed gripping member 3, and a sliding cylinder 20 is inserted into both rotating shafts 19 so as to be movable in the axial direction and rotatable together. At the same time, the support cylinder 21 is fitted so as to be movable in the axial direction but not to rotate integrally. The sliding tube 20 is rotatably fitted into the support tube 21. A side plate 22 is fixed to this support tube 21 via a connecting portion 23. A support rod 24 is attached between the side plates 22, and a fixed grip plate 25 is formed below the support rod 24. A support cylinder 26 is rotatably supported at the center of the support rod 24, and a comb-shaped central movable grip plate 27 is attached to the support cylinder 26. Similarly, a support shaft 28 inserted into the support tube 26 is rotatably supported on the support rod 24.
On both sides of the central movable grip plate 27, comb-like horizontally movable grip plates 29 are rotatably attached to the support shaft 28. The central movable grip plate 27 and both lateral movable grip plates 29 rotate separately and can be opened and closed relative to the lower side of the fixed grip plate 25.

A serrated knife 30 and a guide plate 31 are mounted on the support rod 24, and an insertion groove 31a is formed between the knife 30 and the guide plate 31 above the knife 30. An interlocking lever 32 is attached to each of the support cylinder 26 and the support shaft 28. A pair of guide rollers 34 are supported on a mounting plate 33 attached to the support rod 24 , and an interlocking wire 35 is connected between the interlocking lever 32 of the central movable gripping plate 27 and one sliding tube 20 . The interlocking wire 36 is connected to the guide roller 3 between the interlocking lever 32 of the both laterally movable gripping plates 29 and the other sliding cylinder 20.
They are connected via 4.

A support plate 37 is attached between the machine frames 6 below the fixed gripping member 3, and a pair of solenoids 38 and 39 are attached to the support plate 37. Rods 38a and 39a protrude above both solenoids 38 and 39, and both rods 38a and 39a move up and down as the solenoids 38 and 39 are demagnetized or excited. A pair of guide rollers 40 are supported on both sides of the support plate 37 in correspondence with the respective solenoids 38 and 39, and an interlocking wire 41 is connected between the rod 38a of one solenoid 38 and the rotation shaft 19 on both sides. They are connected via rollers 40, and an interlocking wire 42 is connected between the rod 39a of the other solenoid 39 and the other rotating shaft 19 via both guide rollers 40. And solenoid 38
, 39 move up and down, the central movable gripping plate 27 and both lateral movable gripping plates 29 are fixed via the interlocking wires 41, 42, the rotating shaft 19, the sliding tube 20, and the interlocking wires 35, 36. It is configured to open and close with respect to the grip plate 25.

A rotary belt 44 driven by a motor 43 is stretched around the inside of both machine frames 6, and the movable gripping member 4
This rotating belt 44 is connected to the connecting portions 23 on both sides of the rotary belt 44 . When the belt 44 rotates, the movable gripping member 4 approaches and moves away from the fixed gripping member 3, and the gripping plate 25 of the movable gripping member 4 moves relative to the gripping plate 7.10 of the fixed gripping member 3.
. It is now possible to do so.

[0015] Film supply device 1 configured as described above
As shown in FIGS. 1 and 3, a film folding device 45 is provided above the film folding device 45, which includes a front folding member 46, a rear folding member 47, and both left and right folding members 48. The front folding member 46 has both front and rear pulleys 50, 51 supported between the left and right support frames 49.
and a plurality of round belts 52 wound around both rotating pulleys 50 and 51, and both support frames 49 are fixed on a mounting plate 53 attached between both machine frames 6.

The rear folding member 47 has folding rollers 55 attached along both front and rear edges of the support plate 54, and the support plate 5 is attached to a guide rail 56 attached to the inside of the machine frame 6.
Both left and right end portions of 4 are supported so as to be movable in the front-back direction. A rotating belt 57 is stretched around the inside of both machine frames 6, and both left and right ends of the support plate 54 are connected to this rotating belt 57.

The left and right folding members 48 are supported by a support shaft 59 so as to be rotatable in the left-right direction with respect to a mounting plate 58 attached between both machine frames 6, and an interlocking link 60 and a fixed link 61 are linked via. When the belt 57 rotates and the rear folding member 47 approaches and moves away from the front folding member 46, both the left and right folding members 48 open and close via the interlocking link 60.

Above this film folding device 45, there is a
As shown in FIG. 4, there is provided an article delivery device 62 on which a delivery belt 63 is stretched. Further, a flat belt 64 for carrying out is stretched over the front of the front folding member 46, and a heater plate 65 is inserted into the flat belt 64. Figure 7
As shown in FIG. 2, the article receiving stand 66 can be moved up and down relative to the packaging section S. An article 68 is conveyed to this article receiving table 66 from an article conveyor 67.

As shown in FIG. 5, the brake 17, the solenoids 38 and 39, and the drive motor 43 are connected to the output side of a CPU 69 as a central processing unit. An article width selector 70 and a brake timing selector 71 are connected to the input side of the CPU 69, and can be input by operating keys in each mode. As shown in FIG. 6, in addition to the control program, the program memory also includes a
on timing (constant) and off timing of the solenoid 39, on timing (constant) and off timing of the solenoid 39, on timing and off timing (constant) of the drive motor 43 during normal rotation, and reverse rotation of the drive motor 43. The on-timing (constant) and off-timing of the brake 17 and the off-timing (constant) of the brake 17 are stored in advance.

In particular, the on-timing T17 of the brake 17 is from a timing earlier than the off-timing T43 when the drive motor 43 reverses rotation to a timing earlier than the highest rising timing T66 (constant) of the article receiving table 66. In the area E, the program memory is pre-stored in a plurality of stages. Note that each of the above-mentioned timings is counted for each cycle from the cycle start timing of the packaging machine.

Next, the packaging operation will be explained in detail with reference to FIGS. 6 to 11, focusing on the film supply device 1. First, before the packaging operation, the width of the article 68 is input from the selector 70 to the CPU 69 by operating keys in each mode, and the on-timing T17 of the brake 17 is input from the selector 71 to the CPU 69. Therefore, each timing in FIG. 6 is read out from the program memory by these input signals, and the CPU
69 turns on and off both solenoids 38 and 39, the drive motor 43, and the brake 17 at that timing.

In particular, the on-timing T1 of the brake 17
Regarding No. 7, the brake-on timing selector 71 is set to a stage closer to the highest rising timing T66 of the article holder 66 as the article 68 becomes more flexible. The following packaging operation shows an example in which the brake 17 is turned on while the article tray 66 is being raised. In the film supply device 1, in the state shown in FIG. 7, the drive motor 43 rotates in reverse and then stops at the off timing T43, the movable gripping member 4 is separated from the fixed gripping member 3, and the film 2a is moved between both gripping members 3, 4. stretched between. The film 2a pulled out from the film take-up roll 2 passes between the upper and lower clamping rollers 15 and 16 of the fixed gripping member 3, and is held between the fixed gripping plate 7 and the movable gripping plate 10 of the fixed gripping member 3 by the torsion coil spring 11. The fixed gripping plate 25 of the movable gripping member 4 and each movable gripping plate 27,
29. Since the brake 17 remains off, the film 2a can be pulled out from the take-up roll 2. The article tray 66 is in the lowest position,
An article 68 is placed on the receiving table 66 and is waiting.

When the article holder 66 rises, the film 2a is lifted by the article 68 to the packaging section S and covers the article 68 from above, as shown in FIG. At the beginning of this rise, the brake 17 is in an off state, so the film 2a is pulled out from the take-up roll 2. When the brake 17 reaches the on timing T17 while the article tray 66 is rising,
The film 2a is held between the upper and lower nipping rollers 15 and 16, and the drawing of the film 2a from the take-up roll 2 is stopped. Then, as the article tray 66 rises, the film 2
a is stretched and tension is applied to the film 2a.

As the rear folding member 47 approaches the front folding member 46 as it rises, the left and right folding members 48 close together, and the rear folding member 47 and the left and right folding members 48 close the article 68.
It hits the film 2a on the lower side. At this time, first, the solenoid 39 is turned off, the both laterally movable grip plates 29 are opened, and the left and right sides of the film 2a are released. Next, the solenoid 38 is turned off, the central movable gripping plate 27 is opened, and the central press of the film 2a is released. Goods tray 6
6 reaches the highest position, the rear folding member 47 and both left and right folding members 48 enter under the article 68 to some extent and place the article 68 thereon, and then the article receiving stand 66 is lowered. Then, as shown in FIG. 9, the film 2a is folded under the article 68 from both rear and left and right directions by a rear folding member 47 and left and right folding members 48.

After the holding of the film 2a by the movable gripping member 4 is released, the drive motor 43 is turned on and rotates forward, and the movable gripping member 4 approaches the fixed gripping member 3. After folding by the rear folding member 47 and both left and right folding members 48, the carrying-out belt 63 of the article carrying-out device 62, the round belt 52 of the front folding member 46, and the carrying-out flat belt 64 rotate. When the carry-out belt 63 rotates, the article 68 is carried out toward the front folding member 46 and placed on the round belt 52 of the front folding member 46, as shown in FIG. The front folding member 46 is the article 6
8 into the film 2a.

When the drive motor 43 is turned off and stopped in synchronization with the unloading of the article 68, the movable gripping member 4 overlaps the fixed gripping member 3, and the knife 30 of the movable gripping member 4 cuts the fixed gripping member 3. The film 2a is inserted into the groove 18a, is pushed by the knife 30, enters the cutting groove 18a, and is cut by the knife 30. After this cutting, the brake 17
is released at the off timing, the upper gripping roller 15 becomes rotatable, the gripping of the film 2a is released, and both solenoids 38 and 39 are turned on to move the movable gripping member 4
The movable gripping plates 27 and 29 are closed, and the tip of the film 2a on the fixed gripping member 3 is gripped by the movable gripping member 4.

As shown in FIG. 11, the drive motor 43 rotates in reverse at the on-timing, so that the movable gripping member 4 moves to the fixed gripping member 3.
7, the film 2a gripped by the movable gripping member 4 is pulled out from the film take-up roll 2. After that, as described above, the drive motor 43
stops at the off timing T43, and the movable gripping member 4 stops at a separated position corresponding to the width of the article 68. Note that the rear folding member 47 is separated from the front folding member 46, and both the left and right folding members 38 are opened to each other.

When the article 68 is placed on the conveyor 67 as shown in FIG. 8, the article 68 is placed on the conveyor 67 as shown in FIGS.
8 is transported by a transport conveyor 67 to an article receiving table 66
be placed on top. The packaged articles 68 on the front folding member 46 are placed on the unloading flat belt 64, where the article 6 is wrapped by the heater plate 65.
The folded part on the lower side of 8 is tightly attached. When the article holder 66 is raised, the film 2a is wrapped around the article 68 in the same manner as described above.

On the other hand, before the article 68 on the article holder 66 comes into contact with the film 2a as it rises, the brake 1
7 is turned on, the film 2a is held between the upper and lower holding rollers 1.
5, 16 and between the fixed gripping plate 25 of the movable gripping member 4 and each movable gripping plate 27, 29, the article 6
8 to the packaging section S. Therefore, film 2
A is not pulled out from the take-up roll 2 as the article 68 rises, and as the article 68 rises, tension is applied to the film 2a.

Furthermore, if the movable gripping member 4 grips and separates the film 2a from the fixed gripping member 3, and before the brake 17 is turned on before stopping at a predetermined separated position, the film 2a
is stretched by the movable gripping member 4 after the brake 17 is turned on, and is reliably stretched between the gripping members 3 and 4 without slack. In this embodiment, the on-timing T17 of the brake 17 can be changed in multiple stages within the certain area E, so that the resistance applied to the article 68 when the article 68 lifts the film 2a in the packaging section S can be adjusted. be able to. If the brake 17 is turned on before the timing when the article tray 66 starts rising,
The state of tension of the film 2a pulled out from the fixed gripping member 3 by the movable gripping member 4 influences this resistance. If the switch is turned on after this rising start timing, this resistance changes depending on the amount of pull-out of the film 2a as the article 68 rises. Generally, the more flexible the article 68 is, the later the on-timing T17 of the brake 17 is, the less tension the film 2a will have as the article 68 rises, the less resistance will be applied to the article 68, and the more difficult the article 68 will be deformed.

In the above embodiment, the brake means is a pair of clamping rollers 15 which are braked by a brake 17.
, 16, but for example, the film winding roll 2
The rotation may be prevented. Further, in the above embodiment, the knife 30 of the movable gripping member 4 cuts the film 2a when the movable gripping member 4 overlaps the fixed gripping member 3 as the film cutting means. It may be as shown in Japanese Patent No. 132984.

[0032]

According to the present invention, the brake means 15,1
6 and 17, it is possible to adjust the tension of the film 2a and prevent the article 68 from deforming.

[Brief explanation of the drawing]

FIG. 1: A film supply device of a packaging machine according to this embodiment,
It is a longitudinal section showing a film folding device and an article carrying out device.

FIG. 2(a) is a plan sectional view showing the film supply device according to the present embodiment, and FIG. 2(b) is a plan sectional view showing a solenoid that opens and closes the gripping plate of the movable gripping member in this film supply device. .

FIG. 3 is a plan cross-sectional view showing the film folding device according to this embodiment.

FIG. 4 is a partially cutaway plan view showing the article delivery device according to the embodiment.

FIG. 5 is an electrical block circuit diagram according to the present embodiment.

FIG. 6 is a time chart according to this embodiment.

FIG. 7 is an explanatory view of the operation showing a state in which the film is pulled out to the packaging section.

FIG. 8 is an explanatory diagram showing the state in which the film is lifted by an article.

FIG. 9 is an explanatory view showing the state in which the film is folded into the lower side of the article from both the rear and left and right directions.

FIG. 10 is an explanatory diagram showing the state in which the film is cut and the packaged article is transported out.

FIG. 11 is an operation explanatory view showing a state in which the packaged article is carried out, the film is also folded in from the front, and the film is pulled out to the packaging section.

[Explanation of symbols]

Claims (2)

[Claims] 1. A film supply device (1) that supplies a film (2a) to a packaging section (S), and an article receiving stand (66) that moves up and down with respect to the packaging section (S). 1) includes a fixed gripping member (3) that grips the leading end of the film (2a) pulled out from the film take-up roll (2), and a fixed gripping member (3) that approaches and moves away from the fixed gripping member (3). 3), the packaging machine is equipped with a movable gripping member (4) that grips the leading end of the film (2a), and a brake means (15) that prevents the film (2a) from being pulled out from the take-up roll (2). , 16, 17) and
a driving means (43) for moving the movable gripping member (4) toward and away from the fixed gripping member (3); and an article (68) to be packaged.
) means (70) for selecting the width of said braking means (
15, 16, 17) and drive means (43) based on input signals from the article width selection means (70) to drive and stop the drive means (43) to select the fixed gripping member ( In addition to controlling the separation position of the movable gripping member (4) with respect to the brake timing selection means (71), the brake means (
15, 16, 17) to prevent the film (2a) from being pulled out. 2. In claim 1, the brake timing selection means (71) controls the drive means (43) so that the movable gripping member (4) pulls out the film (2a) from the fixed gripping member (3) and stops. Stop timing (T4
3) The drive timing (T17) can be selected in multiple stages within the region (E) from a timing earlier than the timing earlier than the highest rising timing (T66) of the article tray (66). Characteristics of the film feeding device in the packaging machine.