JPH0759407B2 - Film feeder for packaging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to, for example, a packaging machine for fresh food products, and in a device for supplying a packaging film to a packaging portion thereof, when the packaging film is folded into an article. The present invention relates to a mechanism for pressing the peripheral edge of a packaging film.

[Prior Art] Conventionally, as a packaging machine of this type, for example, JP-A-52-1329
There is one shown in Japanese Patent Publication No. 84. In the film supply device of this packaging machine, a fixed gripping member that grips the leading end portion of the film pulled out from the film winding roll (see the publication No. 7).
And a movable gripping member (see FIGS. 9 and 10 of the publication) for gripping the front end portion of the film on the fixed gripping member by approaching and separating from the fixed gripping member. As shown in FIGS. 8 and 12 of the publication, a supporting rod is rotatably supported in the vicinity of the fixed gripping member, and a holding plate is attached to an upper end portion of the supporting rod. Then, the film is pulled out from the fixed gripping member by the movable gripping member, and in that state, the film is held by the fixed receiving plate and the pressing plate at the upper end of the supporting rod, which is arranged in a position slightly above the fixed gripping member. It has become.

[Problems to be Solved by the Invention] However, in the film supply device described above, since the supporting rod to which the pressing plate is attached is rotated to hold the film, a link for rotating the supporting rod is provided. Not only does this require a mechanism and the structure is complicated, but the packaging machine becomes large in size only in the space where the link mechanism is provided. Further, since the film holding position by the fixed receiving plate and the pressing plate is displaced upward from the line connecting the fixed gripping member and the movable gripping member, the film is tilted by that amount when the film is in a stretched state, and There was a problem that the film could not be stretched straight in the direction orthogonal to the pushing direction of.

The present invention, among variously developed to miniaturize the packaging machine, is an improved film holding mechanism at the time of folding, and by eliminating the link mechanism as in the prior art,
It is an object of the present invention to simplify the structure, to reduce the size of the packaging machine, and to stretch the film drawn out by the movable holding member in a direction orthogonal to the pushing-up direction of the article.

Configuration of the Invention [Means for Solving the Problems] In view of this object, the invention of claim 1 is a fixed gripping member 3 for gripping a front end portion of a film 2a pulled out from a film winding roll 2, and a fixed gripping member. In the film feeding device 1 of the packaging machine, which is provided with a movable gripping member 4 that grips the leading end of the film 2a on the fixed gripping member 3 with respect to the fixed gripping member 3, the fixed gripping member 3 holds the film 2a. A pair of holding rollers 15 and 16 are rotatably provided, respectively, and the film 2a is passed between the holding rollers 15 and 16.
Gripping portions 7 and 10 for gripping the tip end of the gripping rollers 15 and 16 are provided, and a brake 17 for blocking rotation of at least one of the gripping rollers 15 and 16 is provided.

According to a second aspect of the present invention, in the film supply device for the packaging machine according to the first aspect, a heater plate 64 used in a packaging step is arranged in the vicinity of the fixed gripping member 3, and the both nipping rollers are disposed. The nipping roller 15 located at least on the heater plate 64 side among the members 15 and 16 is formed of cork.

Further, according to the invention of claim 3, in the film supply device of the packaging machine according to claim 1, the driving part 43a for moving the movable gripping member 4 closer to and away from the driving part 43a is driven based on an input signal about the width of the article 67 to be packed. A control unit 68 is provided which drives and stops the portion 43a to control the position where the movable gripping member 4 is separated from the fixed gripping member 3, and which controls the brake 17 to operate before the movable gripping member 4 is stopped. .

[Operation] In the invention of claim 1, when the leading end portion of the film 2a on the fixed gripping member 3 is gripped by the movable gripping member 4 and pulled out, at least one of the gripping rollers 15 and 16 is rotated. Motion is blocked by the brake 17. Then, the pulled-out film 2a is stretched on the line connecting the movable gripping member 4 and the sandwiching rollers 15 and 16.

Further, in the invention of claim 2, in addition to the operation of the invention of claim 1, the nipping roller 15 made of cork located on the heater plate 64 side is affected by the heat of the heater plate 64. No more wrapping around.

Further, in the invention of claim 3, in addition to the operation of the invention of claim 1, the brake 17 is actuated to operate both nipping rollers.
After the film 2a is sandwiched between 15 and 16, the drive unit 43a is stopped to stop the movable gripping member 4 at the separated position according to the width of the article 67. Therefore, the film 2a is stretched by the movable gripping member 4 after the brake 17 is actuated, and the film 2a is stretched by both gripping members.
It is stretched between 3 and 4.

[Embodiment] 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 to 3 will be described in detail.

The film supply device 1 includes a fixed gripping member 3 that grips the leading end of the film 2a pulled out from the film winding roll 2, and a leading end of the film 2a that is close to and spaced from the fixed gripping member 3. And a movable gripping member 4 for gripping the portion.

The left and right side plates 5 of the fixed grip member 3 are fixed inside the left and right machine frames 6, and a comb-shaped fixed grip plate (grip portion) 7 is attached between the both side plates 5. A movable arm 8 is attached to both side plates 5.
Is rotatably supported about the support shaft 9 in the vertical direction,
A comb-shaped movable gripping plate (grasping part) 10 is attached between the distal ends of the movable arms 8. The movable arms 8 are urged by a torsion coil spring 11 on a support shaft 9 thereof, and the urging force presses a movable gripping plate 10 between the movable arms 8 against a fixed gripping plate 7 from below. . An operating arm 12 is attached to one of the movable arms 8, and by pushing down the operating arm 12, both movable arms 8 and the movable grip plate 10 are twisted by a coil spring 11.
The gripping plates 7 and 10 are opened to each other by pivoting downward against the biasing force of.

A pair of upper and lower shafts 13 and 14 are supported between both side plates 5 and between both movable arms 8, and an upper shaft 13 supported by the side plate 5 is rotatable and a lower side supported by the movable arm 8 is supported. The shaft 14 of is fixed. A cylindrical holding roller 15 is integrally rotatably fixed to the upper shaft 13. A holding roller 16 is rotatably fitted to the lower shaft 14. Double-sided rollers 15,1
6 are pressed against each other by the biasing force of the spring 11.
The upper holding roller 15 is made of cork. One end of the upper rotary shaft 13 projects to the outside of the machine frame 6,
It is connected to a brake 17 attached to the outside of the machine frame 6. The leading end of the film 2a passes between the holding rollers 15 and 16 and is held between the holding plates 7 and 10.

A cutting groove 18a is provided between both side plates 5 above both gripping plates 7 and 10.
A knife insert 18 having a is attached.

A rotary shaft 19 is supported inside the machine frames 6 adjacent to the fixed gripping member 3, and a sliding cylinder 20 is inserted into the rotary shafts 19 so as to be movable in the axial direction and integrally rotatable. While being fitted, the support cylinder 21 is fitted so as to be movable in the axial direction and not integrally rotatable. The sliding cylinder 20 is rotatably fitted to the support cylinder 21. A side plate 22 is fixed to the support cylinder 21 via a connecting portion 23. A support rod 24 is attached between the both side plates 22, and a fixed grip plate 25 is attached to the lower side of the support rod 24.
Are formed. A support cylinder 26 is rotatably supported at the center of the support rod 24, and a comb-like central movable grip plate 27 is attached to the support cylinder 26. Similarly, a support shaft 24 inserted into the support cylinder 26 is rotatably supported on the support rod 24, and a lateral comb-shaped movable grip plate 29 having a comb tooth shape is provided on the support shaft 28 on both sides of the central movable grip plate 27. It is rotatably attached. The central movable gripping plate 27 and the two laterally movable gripping plates 29 rotate independently, and can be opened and closed with respect to the lower side of the fixed gripping plate 25.

A saw blade-shaped 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 connects the guide rollers 34 between the interlocking lever 32 of the central movable gripping plate 27 and one sliding cylinder 20. The interlocking wire 36 is connected via the guide roller 34 between the interlocking lever 32 of the two laterally movable grip plates 29 and the other sliding cylinder 20.

A support plate 37 is attached between the machine frames 6 below the fixed gripping member 3, and a pair of solenoids 3 are attached to the support plate 37.
8,39 are attached. Rods 38a and 39a project on the solenoids 38 and 39, and the rods 38a and 39a move up and down in accordance with the demagnetization or excitation of the solenoids 38 and 39. A pair of guide rollers 40 are supported on both sides of the support plate 37 corresponding to the respective solenoids 38, 39, and an interlocking wire 41 is guided between the rod 38a of one solenoid 38 and the one rotating shaft 19 in both directions. The rod 39a of the other solenoid 39 and the other rotating shaft 19 are connected through a roller 40.
An interlocking wire 42 is connected between the guide roller 40 and both. Then, when the rods 38a, 39a of the solenoids 38, 39 move up and down, the interlocking wires 41, 42, the rotating shaft 19, the sliding cylinder 20.
The central movable gripping plate 27 and the two laterally movable gripping plates 29 are opened and closed with respect to the fixed gripping plate 25 via the interlocking wires 35 and 36.

A rotary belt 43 driven by a motor (driving section) 43a is laid on the inside of both machine frames 6, and the rotary belt 43 is connected to the connecting sections 23 on both sides of the movable grip member 4. Then, when the belt 43 rotates, the movable gripping member 4 approaches and separates from the fixed gripping member 3, and the gripping plate of the fixed gripping member 3 is moved.
The grip plates 25, 27, 29 of the movable grip member 4 are superposed on 7, 10 and the knife insertion member 18 of the fixed grip member 3 is inserted into the insertion groove 31a of the guide plate 31 of the movable grip member 4 and The knife 30 of the movable gripping member 4 is inserted into the cutting groove 18a.

Above the film supply device 1 thus configured,
As shown in FIGS. 1 and 4, a film folding device 44 including a front folding member 45, a rear folding member 46, and left and right folding members 47 is provided.

The front folding member 45 includes both front and rear rotary pulleys 49 and 50 supported between the left and right support frames 48, and a plurality of round belts 51 wound between the both rotary pulleys 49 and 50. Both of the support frames 48 are fixed on a mounting plate 52 attached between them.

The rear folding members 46 are folding rollers along the front and rear edges of the support plate 53.
54 are attached, and both left and right ends of the support plate 53 are supported by guide rails 55 attached to the inside of both machine frames 6 so as to be movable in the front-rear direction. A rotary belt 56 is stretched around the insides of both machine frames 6, and the left and right ends of the support plate 53 are connected to the rotary belt 56.

The left and right folding members 47 are supported rotatably in the left and right directions by a support shaft 58 with respect to a mounting plate 57 mounted between the two machine frames 6, and via a link 59 and a fixed link 60 to the support plate 53. It is linked.

Then, the belt 56 rotates and the rear folding member 46 becomes the front folding member.
When approaching or separating from 45, the left and right folding members 47 are adapted to open and close via the interlocking link 59.

Above the film folding device 44, as shown in FIGS. 1 and 5, an article carrying-out device 61 having a carrying-out belt 62 is provided. Further, a carry-out flat belt 63 is stretched over the front of the front folding member 45, and a heater plate 64 is inserted in the flat belt 63.

As shown in FIG. 6, the brake 17 and the drive motor 43
The a is connected to the CPU 68 via the input / output interface 69. A signal regarding the width of the article 67 to be packed is input to the CPU 68, and the CPU 68 controls the drive motor 4 based on this input signal.
The movable gripping member 3 is driven and stopped to control the position where the movable gripping member 4 is separated from the fixed gripping member 3, and the brake 7 is controlled to operate before the movable gripping member 4 is stopped.

Now, in the film supply apparatus 1, FIG.
When the movable gripping member 4 is separated from the fixed gripping member 3 and the film 2a is stretched between the gripping members 3 and 4, as shown in FIG.
Passes between the upper and lower holding rollers 15 and 16 of the fixed gripping member 3,
It is held between the fixed gripping plate 7 of the fixed gripping member 3 and the movable gripping plate 10 by the urging force of the torsion coil spring 11, and the fixed gripping plate 25 of the movable gripping member 4 and each movable gripping plate 2 are held.
Holds between 7,29. The upper holding roller 15 cannot be rotated by the operation of the brake 17.

In this state, when the pedestal 65 on which the article 67 is placed moves up, the seventh
As shown in the figure (b), the film 2a holds the upper and lower holding rollers 1
5 and 16 and the fixed gripping plate 25 of the movable gripping member 4 and the movable gripping plates 27 and 29 are lifted to the packaging unit S while being pressed, and the film 2a extends to cover the article 67 from above.

Next, when the rear folding member 46 approaches the front folding member 45, the left and right folding members 47 close each other, and the rear folding member 46 and the left and right folding members 47 bite into the film 2a under the article 67. When the rear folding member 46 and the left and right folding members 47 bite under the article 67 to some extent and place the article 67, the article pedestal 65 descends. Then, as shown in FIG. 7C, the film 2a is folded under the article 67 by the rear folding member 46 and the left and right folding members 47 from both the rear and left and right directions. At the time of this folding, first, both lateral movable grip plates 29 are opened to release the pressers on the left and right sides of the film 2a, and then the central movable grip plate 27 is opened to release the center press of the film 2a.

When the pressing of the film 2a by the movable gripping member 4 is released, the movable gripping member 4 approaches the fixed gripping member 3. After the folding by the rear folding member 46 and the left and right folding members 47, the carrying-out belt 62 of the article carrying-out device 61 and the front folding member 45.
The round belt 51 and the unloading flat belt 63 rotate. When the carry-out belt 62 rotates, as shown in FIG.
Is carried out toward the front folding member 45 and placed on the round belt 51 of the front folding member 45. The front folding member 45 bites into the film 2a below the article 67. In synchronization with the carry-out of the article 67, the knife 30 of the movable gripping member 4 is inserted into the cutting groove 18a of the fixed gripping member 3, and the film 2a is pushed by the knife 30 to cut the cutting groove 18a.
Then, the knife 2 cuts the film 2a. After this cutting, the brake 17 is released and the upper holding roller 15 becomes rotatable, the holding of the film 2a is released, and the movable holding plates 27 and 29 of the movable holding member 4 are closed to fix the fixed holding member 3. The leading end of the film 2a at the movable gripping member 4
Is gripped by.

When the movable gripping member 4 is separated from the fixed gripping member 3 as shown in FIG. 7 (e), the film 2a gripped by the movable gripping member 4 is removed from the film winding roll 2 as shown in FIG. 7 (a). Pull out. Then, first, the brake 17 is actuated to hold the film 2a between the two holding rollers 15 and 16, and then the drive motor 43a is stopped to move the movable gripping member 4 to the article 67.
Stop at the separated position according to the width of. Therefore, film 2a
After the brake 17 is actuated, it is stretched by the movable gripping member 4 and stretched on the line connecting the gripping members 3 and 4. The rear folding member 46 is separated from the front folding member 45, and the left and right folding members 47 are opened to each other.

When the wrapping machine stops during this unloading and one cycle is completed, the article 67 is inserted into the front folding member before it is placed on the unloading flat belt 63.
Stop on 45.

When the article 67 is placed on the conveyor 66 as shown in FIG. 7 (b), the packaging machine is operated and one cycle is started.
Then, as shown in FIGS. 7C and 7D, the article 67 is transported by the transport conveyor 66 and placed on the article pedestal 65. The packaged article 67 on the front folding member 45 is placed on the carry-out flat belt 63,
Then, the heater plate 64 causes the lower folded portion of the article 67 to come into close contact.

When the article cradle 65 rises, the film 2a is wrapped in the article 67 in the same manner as described above.

In particular, in this embodiment, the upper and lower holding rollers 15 and 16 which are conventionally used for effectively guiding the film 2a are effectively used, and the rotation thereof is controlled by the brake 17, so that the above-mentioned conventional technique is used. The link mechanism is unnecessary, the structure of the film pressing mechanism is simplified, and the film supply device 1 can be downsized. Moreover, since the film 2a pulled out by the movable gripping member 4 is stretched on the line connecting the gripping members 3 and 4, the film 2a can be straightly stretched in the direction orthogonal to the pushing direction of the article 67.

Further, since the upper holding roller 15 near the heater plate 64 is formed of cork, it is less susceptible to heat as compared with the case where the roller 15 is made of plastic, and the film is
There is less risk that 2a will stick to roller 15 and wind around.

In addition, the movable gripping member 4 moves from the fixed gripping member 3 to the film.
Before gripping 2a and separating it and stopping at a predetermined separation position,
The brake 17 is activated to hold the film 2a between the rollers 15, 16
Since the film 2a is held between the gripping members 3 and 4, the film 2a is securely stretched without slack.

Advantageous Effects of Invention According to the invention of claim 1, unlike the prior art, a complicated link mechanism can be dispensed with, so that the structure of the film pressing mechanism can be simplified and the film supply device 1 can be downsized and the packaging machine can be downsized. Not by the action of the brake 17 that blocks the rotation of at least one of the nip rollers 15.
2a can be stretched straight in a direction orthogonal to the pushing direction of the article.

Further, according to the invention of claim 2, in addition to the effect of the invention of claim 1, the nipping rollers 15, 1 are affected by the heat of the heater plate 64.
It is possible to reduce the possibility that the film 2a is closely attached to the film 6 and is wrapped around.

Further, according to the invention of claim 3, in addition to the effect of the invention of claim 1, when the movable gripping member 4 is stopped at a position separated from the fixed gripping member 3, the film 2a is held by both gripping members.
You can surely spread between 3 and 4 without sagging.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a film supply device, a film folding device and an article unloading device of a packaging machine according to this embodiment.
FIG. 3 is a plan sectional view showing a film supply device, FIG. 3 is a plan sectional view showing a solenoid for opening and closing a grip plate of a movable grip member,
FIG. 4 is a plan sectional view showing the film folding device, FIG. 5 is a partially cutaway plan view showing the article carrying-out device, FIG. 6 is an electric block circuit diagram, and FIGS. 7 (a) (b) (c). (D) (e) is explanatory drawing which shows a packaging action, respectively. 1 ... Film supply device, 2 ... Film winding roll,
2a ... Film, 3 ... Fixed gripping member, 4 ... Movable gripping member, 7 ... Fixed gripping plate (gripping part), 10 ... Movable gripping plate (gripping part), 15, 16 ... Holding roller, 17 ...... Brake, 1
8a ... Cutting groove, 19 ... Rotating shaft, 20 ... Sliding cylinder (interlocking member), 21 ... Support cylinder, 25 ... Fixed gripping plate (gripping part), 27
...... Center movable gripping plate (grasping part), 29 ...... Horizontally movable gripping plate (gripping part), 30 ...... Knife, 35,36 …… Interlocking wire (interlocking rope), 38,39 …… Solenoid (driving part) , 41, 42 …… Interlocking wire (interlocking rope), 43a …… Drive motor (drive section), 6
8 …… CPU (control unit).

Claims (3)

[Claims] 1. A fixed gripping member (3) for gripping a front end portion of a film (2a) drawn out from a film winding roll (2), and a fixed gripping member which is moved toward and away from the fixed gripping member (3). A film supply device for a packaging machine, comprising: a movable gripping member (4) for gripping a front end of a film (2a) in (3), wherein a pair of the gripping film (2a) is sandwiched between the fixed gripping members (3). The gripping rollers (15, 16) are each rotatably provided, and the gripping portions (7, 10) for gripping the leading end of the film (2a) are provided between the sandwiching rollers (15, 16). A film supply device for a packaging machine, comprising a brake (17) for preventing rotation of at least one of the sandwiching rollers (15, 16). 2. The film supply device for a packaging machine according to claim 1, wherein a heater plate (64) used in a packaging process is arranged in the vicinity of the fixed gripping member (3), and the both nipping rollers are provided. At least the heater plate (64) of (15, 16)
A film supply device for a packaging machine, wherein the nipping roller (15) located on the side is formed of cork. 3. The film supply device for a packaging machine according to claim 1, wherein the drive unit (43a) for moving the movable gripping member (4) closer to and away from one another is based on an input signal about the width of the article (67) to be packaged. The drive portion (43a) is driven and stopped to control the position where the movable gripping member (4) is separated from the fixed gripping member (3), and the brake (17) is activated before the movable gripping member (4) is stopped. A film supply device for a packaging machine, which is provided with a control section (68) for controlling so that the film is supplied.