JPH0422767B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention is directed to, for example, a packaging machine for fresh foods, in which a packaging film stretched and gripped by the packaging portion of the machine is folded into a tray to package the product. The present invention relates to a folding device for folding.

(Prior Art) Conventionally, in the packaging machine described in, for example, Japanese Patent Application Laid-Open No. 58-90010, a packaging film stretched in a packaging section is held in a state in which a packaging film is held at both ends in the width direction by both front and rear pressing members. When the tray on the pedestal device is pushed up to the packaging position, the packaging film is stretched to cover the tray from above, and then the packaging film is folded by the folding device below the tray. The tray is then wrapped.

That is, for example, in the folding device of the packaging machine,
The rear folding member moves forward and backward relative to the fixed front folding member, approaching and separating from each other, and the left and right folding members open and close each other as the rear folding member moves back and forth below the rear folding member. The erected article mounting table can be tilted inward by contact with the rear folding member and both left and right folding members. When the rear folding member moves forward and the left and right folding members close each other, these folding members push the packaging film toward the lower side of the tray on the mounting table and push it against the mounting table. Touch it and tilt it. When the pedestal device moves downward at the same time as this tilting, the tray is sequentially placed on the rear folding member from the rear side of the lower surface, and the packaging film is folded under the tray from both the rear and left and right directions. Thereafter, when the tray is conveyed forward by the rotation of the conveyor belt and transferred from the rear folding member to the front folding member, the packaging film hits the front folding member on the underside of the tray during the transfer, and the packaging film hits the front folding member and moves forward. The tray is also folded in from the bottom, and the folding from the rear overlaps with the folding from both left and right directions, and the folding from the front overlaps to form a folded portion at the bottom of the tray. Next, the rear folding member retreats,
As the folding member moves backward, both the left and right folding members also open from each other.

(Problem to be Solved by the Invention) However, when the rear folding member pushes the packaging film downward into the tray on the mounting table and folds it, there is a possibility that the product may move forward slightly due to the folding force. It was hot. This forward movement of the item causes the overlapping portion of the folding from the rear and the folding from both left and right directions to shift to one side from the center position of the tray, resulting in a problem that the packaging condition deteriorates.

Structure of the Invention (Means for Solving Problems) Therefore, in the present invention, of the front folding member 89 and the rear folding member 77 which are arranged opposite to each other in the front and back direction, at least the rear folding member 77 is provided so as to be movable back and forth, and the rear folding member 77 is provided so as to be movable back and forth. Left and right folding members 82 are provided on both left and right sides of the member 77 so that they can be opened and closed in the left and right directions, and between these front and rear, left and right folding members 89, 77, 82, each folding member 89,
77 and 82 are close to each other and have a folding part R for folding the packaging film F into the article W on the lower side thereof. 77, a locking position for locking the item W so as to prevent the item W from moving forward based on the folding force at a predetermined position within the folding portion R;
The packaging film F is placed against the item W by allowing the forward movement of
The gist is that the folding film F is provided so as to be displaceable in the vertical direction with respect to the folding plane of the packaging film F between the folding position where the folding film F is folded in from the front side.

(Function) Therefore, when the rear folding member 77 enters the lower side of the item W on the item placement table and folds the packaging film F, the item W tries to move forward due to the folding force, but it is not locked. The rear end of the front folding member 89 that has moved upward to the position prevents its forward movement within the folding portion R. When the front folding member 89 moves downward from the locking position to the folding position, the article W is allowed to move forward, and with this forward movement, the front side of the packaging film F is folded by the front folding member 89. Ru.

(Example) Hereinafter, an outline of a packaging machine equipped with a packaging film folding device according to an example of the present invention will be described with reference to the drawings.

[Round belt type film transport device]

Figs. 1 to 4 show a round belt type conveying device 1 installed on the upper part of the machine frame, and as shown in Fig. 2, the starting end of a packaging film F is guided and set from its film supply port P. From the set state, the packaging film F is spread onto the packaging section S shown in FIG. 1 by the drive of the conveying device 1.

[Film folding device]

As shown in FIGS. 1, 3, 4, 5 to 10, a packaging film folding device 76 is installed above the packaging film conveying device 1, and 77 is on both left and right sides of the upper part of the machine frame, as shown in FIG. Rail 78 placed in
A rear folding member 82 is constructed between both rails 78 at the rear of the rear folding member 77, in which both sliders 79 supported so as to be movable in the front and rear directions are connected by a guide plate 80 and rollers 81 on both front and rear sides thereof. A pair of left and right folding members are attached to a shaft 84 so as to be rotatable in the left and right direction to the supporting plate 83, which extends forward from the coaxially attached portion of the support plate 83 through below the rear folding member 77, and extends forward in the longitudinal direction. A guide groove 85 is transparently provided along the guide groove 85, and an auxiliary folding plate 86 is screwed to the tip end thereof so that its position can be adjusted. As shown in FIG. 6, 87 is a guide piece rotatably attached to a shaft 88 at both left and right positions on the lower surface of the guide plate 80 of the rear folding member 77, and is connected to the guide groove 85 of the left and right folding member 82.
has been incorporated into.

Reference numeral 89 denotes a front folding member supported so as to be tiltable in the vertical direction with a rotation center axis 90a between the front ends of both rails 78, and a pair of side frames 90b fixed to the rotation center axis 90a. There is a rotation center shaft 9 in between.
A roller 91a is installed on the same axis as 0a, and a roller 91b is installed on the rear side of this roller 91a, and these rollers 91a, 91
A plurality of round belts 92 are stretched between the belts B and rotated only in the direction of the arrow C. As shown in FIG. 6, this front folding member 89 is normally on the same plane as the rear folding member 77, and when the rotation center axis 90a rotates, as shown in FIGS. is tilted upward about the same axis 90a, and the rear roller 91b moves upward to function as a stopper, as will be described later.

In FIGS. 1, 3, and 4, 93 is the rail 78.
A bracket 94 erected on the rear end is a lever fixed to a support shaft 95 rotatably installed between the upper parts of the bracket 93, and is fixed to an interlocking rod 96 that is driven up and down. It is rotatably mounted on a shaft 96a. 97 is a pair of levers fixed to both ends of the support shaft 95 on the outside of the bracket 93; 98 is a link rotatably attached to the shaft 99 at the tip of the lever 97; A shaft 100 is rotatably attached to the tip.

When the interlocking rod 96 is in the upward movement position, the rear folding member 77 is in the retracted position as shown in FIG. 7, and the left and right folding members 8
2 are open to each other. When the interlocking rod 96 moves downward from this state, the rear folding member 77 moves between the lever 97 and the link 98 as shown in FIGS.
As the guide piece 87 of the rear folding member 77 moves forward by being pushed by the
5 is regulated in position, the left and right folding members 82 close together, and these front, rear, left and right folding members 89, 77, 8
The space between the two is the folded part R. This folding part R is the third
As shown in the figure, it corresponds to the packaging section S of the packaging film conveying device 1.

As shown in FIGS. 5 and 6, 151 is the rear folding member 7.
A pair of mounting members are mounted on a shaft 153 so as to be rotatable in the left and right direction on a support plate 152 installed between the left and right rails 78 above the rear folding member 77. A spring 154 attached corresponding to the folding member 82 and connected between the base end portions 151a of the folding member 82 allows the folding members 82 to normally open from each other. Reference numeral 155 denotes guide pieces attached to both left and right sides of the guide plate 80, which
51 , and controls the opening of the mounting member 151 by the spring 154 as the rear folding member 77 moves back and forth.

Reference numeral 161 is an extrusion member installed above both the mounting members 151 so as to be movable in the front and back direction between both the rails 78, and is connected to an endless chain 162 on both sides thereof, and is rotated by forward and reverse rotation of the chain 162. It is configured to reciprocate from the rear position of both rails 78 to near the front folding member 89.

[Export device]

1, 3, and 4 show a device 101 for discharging goods W, and 102 is a pair of support plates rotatably supported on both sides of a support shaft 103 installed between the lower portions of both the brackets 93. A conveyor 104 extends forward from the support shaft 103 and has an endless sponge belt 104a stretched between its front ends.The conveyor 104 is rotatably supported by a shaft 102a on both sides of its rear end. It corresponds to the packaging section S of the packaging film transport device 1. Reference numeral 113 indicates both brackets 93 below the support shaft 103.
A pair of guide rods are rotatably supported on both sides of a support shaft 114 installed between them, and rollers 113a attached to the tips of the rods are connected to the conveyor 104.
It is in contact with a guide plate 115 that hangs down from both sides of the rear end. 116 is the support shaft 103 and shaft 1
02a, the shaft 11 between the support plate 102 and the guide rod 113, and the support shaft 114 and the roller 113a.
6a and 116b, the upper left and right shafts 116a are connected by a connecting rod 117. Reference numeral 118 denotes a handle screwed onto a support rod 119 installed between the upper portions of both brackets 93;
It is fixed at 7.

Then, rotate the handle 118 to remove the support rod 1.
19, the support plate 102
rotates vertically around the support shaft 103, and the guide rod 113 rotates vertically around the support shaft 114 via the interlocking link 116, causing the guide plate 115 of the conveyor 104 to rotate vertically around the support shaft 113. While the conveyor 113a is sliding, the conveyor 104 moves almost parallel in the vertical direction.

108 is a drive shaft 104b of the conveyor 104
A belt pulley 109 is fixed to the support shaft 103.
The belt pulley is rotatably supported by the belt pulley 108 and 109, and a belt 110 is stretched between the belt pulleys 108 and 109. A sprocket 111 is rotatably supported on the support shaft 103 so as to be interlocked with the belt pulley 109, and is driven and rotated by a chain 112.

Then, when the chain 112 is rotated in the direction of arrow D, the sprocket 111, the belt pulley 109,
The belt 104a of the conveyor 104 rotates in the sending direction E via the belt 110 and the belt pulley 108. However, since the sprocket 111 is supported on the spindle 103 by a one-way clutch 111a, the rotation of the chain 112 is caused by the rotation of the sprocket 1.
11 and the belt 10 of the conveyor 104
4a does not rotate in reverse.

[Case device, film holding member, outside]

As shown by the white frame in FIGS. 1 and 2, 46 is a pedestal device that is moved up and down between the inner end of the article supply device 45 and the packaging section S and the folding section R, and is attached so as to be tiltable. a plurality of loading tables (not shown);
The product W is removed from the product supply device 45 at the lowest moving position.
is being transported and placed there. (Refer to Japanese Unexamined Patent Publication No. 59-166819.) In FIGS. 1 to 4, 26 is a front holding member attached to the front side of the packaging section S of the packaging film conveying device 1, and 37 is also attached to the rear side. These pressing members 26,
37. Reference numeral 43 denotes a saw blade mounted near the film supply port P of the packaging film conveying device 1, and is adapted to form perforations at intervals of a certain length of the packaging film F during conveyance. Reference numeral 171 is a push-up member mounted so as to be vertically movable around the pedestal device 46, and is configured to push up the packaging film F stretched on the packaging section S to the folding section R of the folding device 76. ing. 177 is this push-up member 1
The push-up member 171, which is a left and right pressing member that moves in conjunction with the vertical movement of the packaging film 71, clamps both left and right edges of the packaging film F when it reaches it. 47 is a heater device on which the packaged goods carried out from the front folding member 89 are placed.

[Packaging action of the example]

Next, an outline of the actual packaging operation will be explained.

When an article W (a tray W1 containing an article) is placed on the supply device 45, the article W is transferred and placed on the pedestal device 46 that has moved downward. At this time, the push-up member 171 is already at the lowest position, and the rear folding member 77 is moved backward by the upward movement of the interlocking rod 96.

When the conveyance device 1 is driven in synchronization with this feeding, the starting end of the packaging film F located at the supply port P is conveyed toward the packaging section S at the center of the conveyance device 1. On the way, the sawtooth 43 forms perforations in the width direction of the packaging film F at every fixed length, and an instantaneous brake is applied at the supply port P to pull the packaging film F, and this tensile force causes the packaging film F to be pulled. It is cut at the perforations and conveyed to the top of the packaging section S.

The packaging film F on the packaging section S is clamped by the upward movement of both the front and rear pressing members 26, 37.

When the push-up member 171 is moved upward from this packaging film set state, when the push-up member 171 reaches the packaging film F, both left and right press members 1
77 also clamps both left and right edges of the packaging film F. Thereafter, as shown in FIG. 2, the packaging film F is pushed up and stretched by the pushing up member 171.

Next, the pedestal device 46 moves upward so that the article W comes into contact with the packaging film F, and the push-up member 17
1 is separated from the packaging film F, and the article W is covered with the packaging film F. The left and right pressing members 177 release the left and right edges of the packaging film F as the push-up member 171 moves downward.

Thereafter, as the pedestal device 46 moves upward, the interlocking rod 96
When the rear folding member 77 moves downward, the rear folding member 77, which is in the retracted position, moves forward. Along with this forward movement, the guide piece 155 on the rear folding member 77 moves the guide edge 15 of the mounting member 151.
6 is pushed inward against the bias of the spring 154, and both mounting members 151 approach each other. Both mounting members 151 hold the packaging film F on the pedestal device 4.
At the same time, the product W on the tray W1 is pushed toward the bottom of the tray W1, and the tray W1 is brought into contact with the tray W1 at a position slightly spaced downward from the lower surface of the tray W1 to tilt it. It enters below the item W and places it there. At this time, as the rear folding member 77 moves forward, the left and right folding members 82 also approach each other with a slight delay. Before the rear folding member 77 comes into contact with the packaging film F, the front folding member 89 tilts upward as shown in FIG.
(stopper) moves upward.

Next, the rear folding member 77 and both left and right folding members 82
When the rear folding member 77 enters below the article W in the same manner as both placing members 151, both placing members 151 are attached to the spring 154. The product W is separated from the product W by force, and the product W is folded into the rear folding member 77.
be placed on top. Then, when the pedestal device 46 moves downward again, the packaging film F is folded under the product W from both rear and left and right directions while the product W is placed on the rear folding member 77. In synchronization with this folding operation, the clamping by the rear presser member 37 is released, and only the clamping by the front presser member 26 is maintained.
When the rear folding member 77 pushes the packaging film F toward the lower side of the tray W1 on the mounting table and folds it, the roller 91b of the front folding member 89 engages with the item W and uses its folding force. Prevents forward movement of item W. At the time of folding, the pushing member 161 moves forward and approaches the item W as shown in FIG. 9, and then, as shown in FIG. The roller 91b of the front folding member 89 moves down and the front folding member 89
returns to the same plane as the rear folding member 77.

Thereafter, when the pushing member 161 pushes out the article W, the clamping by the front pressing member 26 is released and the belt 104a is rotated. Then, the article W is conveyed forward by the advancement of the pushing member 161 while being separated from or in contact with this belt 104a, and is supported from above by this belt 104a to prevent it from swinging, while being transported backward as shown in FIG. Front folding member 8 from above folding member 77
9. During the transfer, the packaging film F hits the front folding member 89 on the lower side of the item W and is folded in from the front as well, and the folding from the rear overlaps with the folding from both left and right directions, and the folding from the front overlaps. As shown in FIG. 11, the lower side of the article W becomes a folding portion F1. Next, the interlocking rod 96 is moved upward again and the rear folding member 77
, the left and right folding members 82 open from each other, and the pushing member 161 also retreats.

After packaging, the same article W is carried out to the heater device 47, where the folded portion F1 is brought into close contact with the article W, thereby completing one process.

In the embodiment described above, by tilting the front folding member 89 and moving the roller 91b on the rear side up and down, the roller 91b serving as a stopper is retracted from the article W at the lower movement position, and the same roller 91b is moved away from the article W.
The roller 91 is allowed to move forward at the same position.
b can be locked to the article W to prevent the article W from moving forward; however, the entire front folding member 89 may be moved in parallel in the vertical direction.

Effects of the Invention As detailed above, according to the present invention, the forward movement of the article W based on the folding force of the rear folding member 77 is stopped at a predetermined position in the folding portion R by the rear end of the front folding member 89 having a stopper function. Therefore, the folding from the rear side and the folding from both left and right sides always overlap at the center of the tray W1 without being misaligned.
Not only can a good packaging condition be obtained, but also the number of parts can be reduced because the front folding member has not only a film folding function but also a stopper function.

[Brief explanation of drawings]

FIG. 1 is a schematic side sectional view of a fresh food packaging machine using a packaging film folding device according to an embodiment of the present invention, and FIG. 2 is a side view of the packaging machine as seen from the line A schematic cross-sectional view, FIG. 3 is a schematic enlarged side cross-sectional view of the folding device and unloading device, and FIG. 4 is the X in FIG.
- Schematic enlarged cross-sectional view of both devices as seen from X-rays, No. 5
The figure is a schematic enlarged plan view of the folding device, FIG. 6 is a schematic enlarged side sectional view, and FIG. 7 is a partially cutaway enlarged plan view showing each folding member of the folding device.
The figures show the folding action, in particular, Figs. 8 and 9 are side schematic enlarged sectional views showing the action of preventing the forward movement of the article by the stopper of the front folding member during folding, and Fig. 11 is a cross-section of the article wrapped with a packaging film. It is a diagram. Packaging film conveying device...1, Front presser member...
...26, Rear press member...37, Item feeding device...
45, cradle device...46, folding device...76, rear folding member...77, both left and right folding members...82, front folding member...89, roller (stopper)...91
b, Unloading device...101, Conveyor...104,
Placement member...151, Pushing member...161, Pushing member...171, Left and right pressing members...17
7. Packaging film...F, Packaging section...S, Folding section...R, Item...W.

Claims (1)

[Scope of Claims] 1. Out of the front folding member 89 and the rear folding member 77 which are arranged opposite to each other in the front-rear direction, at least the rear folding member 77 is provided so as to be movable back and forth, and the rear folding member 77 is provided on both left and right sides. Both left and right folding parts 8 that can be opened and closed
2 are provided, and these front, rear, left and right folding members 89, 77,
In the packaging film folding device, the space between the front folding members 89 and 82 is a folding part R in which the folding members 89, 77, and 82 approach each other and fold the packaging film F into the article W on the lower side thereof. A locking position in which at least the rear end is locked to the item W at a predetermined position in the folding portion R so as to prevent the item W from moving forward based on the folding force when the film is folded by the rear folding member 77; , characterized in that it is provided so as to be displaceable in the vertical direction with respect to the folding plane of the packaging film F between a folding position where the packaging film F is folded from the front side with respect to the product W while allowing forward movement of the product W. A packaging film folding device for a packaging machine.