JPH0242725B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application)
The present invention relates to a folding device for wrapping an article by folding a packaging film stretched over the packaging portion onto the article.

(Prior art and problems to be solved by the invention) In a conventional packaging machine, as shown in FIG.
7, 47, and 48 were installed. This structure not only complicates the entire packaging film holding device, but also requires a large installation space. Furthermore, the maximum length f in the longitudinal direction of the packaging film F is limited, and the items W1 and W that can be packaged are
2 size was limited.

Therefore, a structure was considered in which the left and right pressing members 47, 48 were omitted and only the front and rear pressing members 26, 37 were used. With this structure, for example, when wrapping an item W1 that is long in the left-right direction, the middle part of the folding edge 82a of the left and right folding members 82 is used for wrapping at the lower positions on both rear sides of the item W1 (both upper sides in the figure). It first bites into the film F, and following that biting, the leading end side of the folded edge 82a from the middle part gradually bites into the film F. On the other hand, when packaging an item W2 that is short in the left and right direction, the left and right folding members 8
2 are close to each other, the folding edges 82a are inserted into the packaging film F, so that the folding edges 82
The tip of the folded edge 82a is first dug in, and then the middle portion of the folded edge 82a is bitten in sequentially from the tip of the folded edge 82a. At this time, with this structure, since the packaging film F is folded while being held simultaneously by both the front and rear presser members 26 and 37 at both ends in the width direction, the middle part and the leading end of the left and right folding members 82 are folded. If the timing of biting into the stretched packaging film F is different due to the rise of the products W1 and W2, a large force will be applied to a part of the packaging film F, that is, the part of the packaging film F where the folding edge 82 is bitten by the eye tip. In addition, there was a risk that the packaging film F would be torn.

The present invention has been made based on the problems and findings of the prior art as described above, and is capable of preventing the packaging film F from being torn during packaging and improving the packaging condition. An object of the present invention is to provide a packaging film folding device in a packaging machine that can be used in a packaging machine.

(Means for Solving the Problems) This invention provides a first folding member and a second folding member that are movable relative to each other in two opposing sides of the four peripheral parts, and The other two sides are provided with third and fourth folding members supported so as to be rotatable in a direction perpendicular to the direction spanning the first and second folding members, and the first folding member of the second folding member A packaging in which the third and fourth folding members are interlocked so as to be openable and closable with each other as the folding member moves back and forth to the folding member, and the space between the first to fourth folding members is a folding part in which the folding members are close to each other. In this film folding device, a folding edge adjusting member that can protrude toward the folding portion is provided at an intermediate portion of the folding edge of the third and fourth folding members, which is on the folding portion side. and an auxiliary folding portion that is movable along the tip edge of the fourth folding member,
The gist is that the folding edge adjusting member and the auxiliary folding part are connected so that as the folding edge adjusting member protrudes toward the folding part, the auxiliary folding part also moves toward the folding part.

(Function) That is, as shown in FIG. 15 of the drawings,
Items W that are short in the third and fourth folding members 82 direction
2, the folded edge adjustment member 186
is made to protrude from the folding edge 82a toward the folding portion R side to perform the folding operation. Then, the folded edge 82a
Since there is no left part of the timing for biting into the packaging film F between the approximately middle part and the leading end, the folding edge 82a can be bited into the packaging film F evenly, and as a result, the third and fourth This reliably prevents the packaging film F from being torn due to a lag in the timing of the folding member 82 being inserted into the packaging film F.

Further, as the folding edge adjusting member 186 protrudes toward the folding portion R side, the auxiliary folding portions 187 protruding from the tip edges 82b of the third and fourth folding members 82 also move toward the folding portion R side. So,
When the third and fourth folding members 82 come close to each other, they become easier to bite into the packaging film F more deeply and are folded in securely.

(Embodiment) Hereinafter, an embodiment of a packaging machine equipped with a packaging film folding device of the present invention will be described.

This packaging machine is broadly divided into a packaging film transport device 1, a packaging film folding device 76, and an article transport device 101.

Each device will be explained in detail below.

1 Packaging film transport device As shown in Figures 2 and 3, the packaging film transport device 1 has two roller shafts 3 and 4 rotatably installed from the outside on the left side between the front and rear fixed frames 2. At the same time, a shaft 5, a pair of upper and lower shafts 6 and 7, and a pair of upper and lower shafts 8 and 9 are fixed, and a pair of upper and lower shafts 10 and 11 are fixed on one left and right sides. Reference numeral 12 denotes a pair of opening/closing frames supported rotatably in the vertical direction on both front and rear ends of the shaft 6, extending from the same shaft 6 to an upper midpoint between the roller shafts 3 and 4, and extending from the ends of the opening/closing frames 12. A support frame 13 having a handle 14 is fixed between the parts, and a pair of roller shafts 15 and 17 are rotatably installed on the base end side of the support frame 13, and a shaft 16 is fixed thereto.

In FIG. 3, 18 is the pair of upper and lower shafts 1.
A pair of upper and lower rollers are rotatably supported on the front ends of 6 and 5; 19 is the pair of upper and lower shafts 6 and 7;
It is a pair of upper and lower rollers rotatably supported on the front end of the belt, and five endless round belts 20 are vertically opposed and spanned between the rollers 18 and 19 on the rear side. Reference numeral 21 also shown in FIG. 3 is a pair of upper and lower rollers rotatably supported on the front end portions of the pair of upper and lower shafts 10 and 11,
3 between the upper roller 21 and the front side of the upper roller 18 via the upper roller 19.
While spanning the endless round belt 22 of books,
4 between the lower roller 21 and the front side of the lower roller 18 via the lower roller 19.
The endless round belt 23 of the book is spanned, and the lower running part 22a of the upper round belt 22 is interposed between the upper running part 23a of the lower round belt 23, as shown in FIG. Parts 22a, 23a
are arranged alternately one by one to form seven belt rows M. Reference numeral 24 shown in FIG. 3 denotes a pair of upper and lower rollers rotatably supported on the front ends of the pair of upper and lower shafts 8 and 9, and 25 denotes the roller 21.
A pair of upper and lower rollers rotatably supported on the inside of the fixed frame 2, both rollers 2
4 and 25, the upper and lower round belts 22 and 23
It makes me nervous. Note that the upper round belts 20 and 22 are also kept under tension by the roller shaft 17.

Reference numeral 26 denotes a cylindrical front holding member supported vertically movably with respect to the front fixed frame 2, and as shown in FIG. 4, the inner three round belts 23 of the lower round belts 23 The lower running part of the round belt 23 is inserted, and the pressing part 26a is interposed between the upper and lower running parts of the circular belt 23. Note that this pressing part 26
A corresponds to the inner five belts of the belt row M. Reference numeral 27 shown in FIG. 4 is a pressure receiving plate extending from the fixed frame 2 in correspondence with the presser member 26, and is interposed between the upper and lower running portions of the upper round belt 22.

Reference numeral 28 shown in FIGS. 2 and 3 is a movable frame inserted into the lower shafts 5, 7, 9, and 11 so as to be movable in the axial direction, and the fixed frame 28 on the front side extends from both left and right sides of the movable frame. The upper shafts 16, 17, 6, 8, 10 can be inserted into the notches 28a formed in the upper edge of the moving frame 28. There is. 30 is the pair of upper and lower shafts 16, 5 so as to be positioned within the moving frame 28.
31 is a pair of upper and lower rollers that are supported in the same way relative to the pair of upper and lower shafts 6 and 7; 32 is the pair of upper and lower shafts; 10,1
These rollers 30, 31, and 32 are a pair of upper and lower rollers supported in the same manner as shown in FIG. I'm starting to do that.

33 is five endless round belts stretched between the upper rollers 30 and 32 via the upper roller 31; 34 is the lower roller 30;
As shown in FIG. With the lower running part 33a of the round belt 33 interposed, both running parts 33a, 34a
are arranged alternately one by one to form 11 belt rows M. Reference numeral 35 denotes a pair of upper and lower rollers that are movably and rotatably supported in the axial direction of the upper and lower shafts 8 and 9 so as to be positioned within the movable frame 28. The upper and lower round belts 33 and 34 are tensioned by a pair of upper and lower rollers 36 that move in the axial direction following the movement adjustment and are rotatably supported with respect to the moving frame 28 inside the roller 32. . Note that the upper round belt 33 is also kept under tension by the roller shaft 17.

Reference numeral 37 denotes a cylindrical rear presser member that supports the movable frame 28 so as to be able to move it up and down, and numeral 38 shown in FIG.
The positional relationship between the rear presser member 37 and the pressure plate 38 and the upper and lower round belts 33, 34 is the same as that of the front presser member 26.
The same is true for .

39 is the roller shaft 3, as shown in FIG.
A pair of pulleys supported on the rear end of 4, and an endless round belt 40 between both pulleys 39.
It spans the In FIG. 3, 41 is a gear fixed to both the upper and lower rollers 21, and 42 is a gear fixed to both the upper and lower rollers 32 and movable in the axial direction together with the rollers 32. The drive rotation of the lower shaft 11 is transmitted, and the rollers 21, 32, round belts 22, 2
Rotation is transmitted to each part via 3, 33, 34, etc. Reference numeral 43 in FIG. 2 is a saw blade provided between both roller shafts 3 and 4 on the left side of the fixed frame 2, and is movable vertically.

A case will be described in which a packaging film F is set from one of a pair of upper and lower take-up rolls 44 provided on the left side of the packaging film conveying apparatus 1 constructed as described above. In this case, operate the operation bar 29 in advance to move the moving frame 28.
The position of is adjusted according to the width dimension of the packaging film F. When the handle 14 on the left side of the machine shown in FIG. 2 is grabbed and lifted upward, the opening/closing frame 12 rotates upward around the shaft 6.
Upper rollers 18, 30 and lower roller 18,
30 and the film supply port P is opened. From this state, the starting end of the packaging film F on the take-up roll 44 is guided to the supply port P via both roller shafts 3 and 4, and the lower round belt 20, 23, 2
4 Place it on top. Next, the opening/closing frame 12 is returned downward, and the upper rollers 18, 30 and the lower roller 1 are removed.
8 and 30 and close the film supply port P, both edges in the width direction of the packaging film F are connected to the upper round belts 22 and 23 as shown in FIG.
For the belt row M of the lower running parts 22a, 23a and the upper running parts 23a, 34a of the lower round belts 23, 24, the running part 23 of the first row from the inside
2nd row running section 22a, 33 above a, 34a
They are inserted alternately below the running sections 23a and 34a of the third row, resulting in an up-and-down meandering state. From this set state, the packaging film F is transferred to the conveying device 1.
It is expanded into the packaging section S by the drive of.

2 Packaging film folding device Figs. 7 to 11 show the packaging film folding device 76 of the present invention installed above the conveying device 1, and 77 are arranged on both left and right sides of the upper part of the machine as shown in Fig. 9. A rear folding member 8 as a second folding member, in which both sliders 79 supported so as to be movable in the front and rear directions with respect to the rail 78, which are supported by a guide plate 80 and rollers 81 on both the front and rear sides thereof, are connected.
Reference numeral 2 denotes a pair of third and fourth folding members, which are a pair of left and right folding members, which are mounted on a shaft 84 so as to be rotatable in the left and right direction with respect to a support plate 83 installed between both rails 78 at the rear of the folding member 77. It is a member that extends forward from the coaxial 84 attachment part, and has a guide groove 85 transparent therethrough along its longitudinal direction. Note that the intermediate portions of the folding edges 82a inside the left and right folding members 82 are formed in a slightly concave shape.

Reference numeral 186 denotes a folding edge adjusting member rotatably attached to a shaft 188 on the base end side of the left and right folding members 82, as shown by the imaginary line in FIG. The auxiliary folding part 187 at the tip can be protruded from the folding edge 82a of the left and right folding members 82.
It is made to protrude from the tip edge 82b. and,
This folding edge adjustment member 186 is held by a leaf spring 189 at the lower side of its tip against the lower surface of both the left and right folding members 82, and the folding edge 82
It is fixed to both the left and right folding members 82 by screws 190 at appropriate protruding positions from a. At this time, the auxiliary folding portion 187 at the tip of the folding edge adjusting member 186 is moved along the tip edges 82b of both the left and right folding members 82 as the auxiliary folding portion 187 is rotated.

Reference numeral 87 shown in FIGS. 10 and 11 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 attached to the guide groove 85 of the left and right folding member 82.
As shown in FIG. 11, both side edges of the guide groove 85 are engaged with a fitting groove 87a formed on the entire outer periphery.

Reference numeral 89 shown in FIG. 9 is a front folding member as a first folding member which is constructed by installing a plurality of rollers 90 between the front ends of both rails 78, and the rollers 90 are moved only in the direction of arrow C by a belt 91. I'm trying to rotate it.

Reference numeral 93 shown in FIG. 8 is a bracket erected on the rear end of the rail 78, and 94 is a lever fixed to a support shaft 95 rotatably installed between the upper parts of the bracket 93, which is vertically driven. A shaft 96a is rotatably attached to an interlocking rod 96.
97 is a pair of levers fixed to both ends of the support shaft 95 on the outside of the bracket 93, and 98 shown in FIGS. 7 and 8 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 of the slider 79.

When the interlocking rod 96 is in the upward movement position, the rear folding member 77 is in the retracted position and the left and right folding members 82 are in an open state, as shown in the ninth diagram. When the interlocking rod 96 moves downward from this state, the rear folding member 77 is pushed forward by the lever 97 and the link as shown in FIG.
The positions of the two guide grooves 85 are regulated, and both the left and right folding members 82 close to each other, and a folding portion R is formed between the front, rear, left, and right folding members 89, 77, and 82. This folding section R corresponds to the packaging section S of the conveying device 1.

3 Unloading device FIGS. 7 and 8 show the unloading device 101 for the article W, and 102 shown in FIG.
3. A pair of support plates rotatably supported on a support shaft 103 installed between the lower parts of the support shaft 103.
A conveyor 104 extending forward from 3 and having an endless sponge belt 104a stretched between its front half is supported, and the conveyor 104 corresponds to the packaging section S of the conveying device 1. 106
is a stopper supported at the rear of the support shaft 103 so as to be able to take three positions with respect to the support shaft 107 installed between the brackets 93, and below which is connected to the stopper shaft 105 installed between the support plates 102. Together, the conveyor 10
The tilt of 4 can be adjusted.

108 is the drive shaft 104 of the conveyor 104
a belt pulley fixed to b; 109 is the support shaft 10;
The belt pulley 108, 109 is rotatably supported by a belt pulley 108, 109. 111 is a sprocket rotatably supported on the support shaft 103 so as to be interlocked with the belt pulley 109;
It is designed to be rotated by the drive.

Then, when the chain 112 is rotated in the direction of arrow D, the sprocket 111 and the belt pulley 10
9. 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 not transmitted to the sprocket 111, and the conveyor 1
04 belt 104a does not rotate in reverse.

Next, an outline of the actual packaging operation will be explained. The article W placed on the supply device 45 shown in FIG. 1 is transferred and placed on the pedestal 46 that has moved downward. At this time, the rear folding member 77 is moved backward by the upward movement of the interlocking rod 96.

(Operation of the embodiment) When the conveying 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 conveying device 1. go. On the way, the saw blade 43 instantaneously moves upward to form perforations in the width direction at every fixed length of the packaging film F, and furthermore, the roller shaft 4
When the instantaneous brake is applied, the packaging film F held between the upper and lower shafts 15 and 4 is pulled, and this tension causes it to be cut at the perforation, and as shown by the imaginary line in Figure 3, the packaging film F is pulled. transported to.

As shown in FIGS. 5 and 6, the packaging film F on the packaging section S is held between the pressure receiving plates 27 and 38 by moving the front and rear press members 26 and 37 upward.

From this packaging film set state, the pedestal 46
is moved upward and the article W is pushed up to the packaging position as shown by the imaginary line in FIG. 2, the interlocking rod 96 shown in FIG. , as the left and right folding members 82 move forward, they are mutually closed. and,
When the pedestal 46 is moved down 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.

After that, the interlocking rod 96 is moved upward again and the rear folding member 77 is moved backward, and as the rear folding member 77 is moved back, both the left and right folding members 82 are opened to each other, and both the front and rear presser members 26 and 37 are moved downward to release the clamped state. Ru. Therefore, the article W is rotated by the rotation of the belt 104a.
is conveyed forward, and at this time, the packaging film F hits the front folding member 89 on the lower side of the article W and is folded in from the front as well, and when the article W passes over the front folding member 89, it is folded backward and on both the left and right sides. The folding from the front overlaps with the folding from the front to form a folded portion _F1 on the lower side of the item W as shown in FIG.

After packaging, the same item W is carried out, and one process is completed.

The front folding member 89 is also movable back and forth in the front and rear directions, and the folded article W
It may also be configured to transport.

In this embodiment, as shown in FIG. 14, when wrapping an item W ₁ that is long in the left and right direction, the folding edge adjustment member 186 is rotationally adjusted to fold the product from the folding edges 82a of the left and right folding members 82. Do not allow it to protrude toward the R side. In this case, if the middle part of the folding edge 82a is formed into a concave shape as in the embodiment described above, there will be no difference in the timing of biting in between the middle part and the tip of the folding edge 82a. On the other hand, as shown in FIG. 15, when wrapping an item _W2 that is short in the left-right direction, the folding edge adjustment member 186 is made to protrude from the folding edge 82a toward the folding portion R side. The amount of protrusion is changed as appropriate depending on the shape and size of the item W.

In this way, by making the folding edge adjustment member 186 protrude from both the left and right folding members 82 toward the folding part R, even if the size of the item W to be packaged changes from W1 to W2, the center of the folding edge 82a Since it is possible to eliminate the difference in the time when the left and right folding members 82 bite into the packaging film F, the tearing of the packaging film F that occurs due to the difference in the time when the left and right folding members 82 bite into the packaging film F can be eliminated. can be prevented.

On the other hand, in the conventional example shown in FIG. 13, when folding from the front after folding from both the rear and left and right directions, the packaging film F on both sides of the lower front of the items W ₁ and W ₂ (bottom sides in the figure) Unfolded parts are likely to occur. However, as in the embodiment described above, the auxiliary folding portion 187 at the tip of the folding edge adjusting member 186 protrudes from the tip edge 82b of both the left and right folding members 82, and as the folding edge adjusting member 186 is rotated, If the left and right folding members 82 are movable along the folding member 82, when the left and right folding members 82 approach each other when folding from the front after folding from both the rear and left and right directions,
Insert the packaging film F deeply into the packaging film F on both sides of the lower front of the items W ₁ and W ₂ (bottom sides in the figure).
The packaging film F can be reliably folded into W ₁ and W ₂ . In particular, when wrapping an item _W2 that is short in the left-right direction, when the folding edge adjustment member 186 is made to protrude from the folding edge 82a as shown in FIG. Therefore, both the left and right folding members 82
When they approach each other, it becomes easier to bite into the packaging film F more deeply, so that it can be folded more reliably. On the other hand, since an item W ₁ that is long in the left-right direction is more easily folded in than an item W ₂ that is short in the left-right direction, the auxiliary folding portion 187
may be located in the center of the leading edge 82b as shown in FIG. 14, and does not necessarily have to be located closer to the inside of the leading edge 82b, but if it is inserted too deeply, the packaging film F may be damaged. Since it is easy to tear, it is preferable to locate it in the center of the tip edge 82b.

(Effects of the Invention) As detailed above, according to the present invention, the article W
By changing the amount of protrusion of the folding edge adjusting member according to the shape and size of the folding edge, it is possible to eliminate the difference in the timing of biting into the packaging film between the middle part and the leading edge of the folding edge. It is possible to reliably prevent the packaging film F from being torn due to timing lag.

Further, as the folding edge adjustment member protrudes toward the folding section, the auxiliary folding sections protruding from the tip edges of the third and fourth folding members also move toward the folding section. When the four folding members are close to each other, they can be more easily inserted into the packaging film and can be folded more reliably.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a fruit and vegetable packaging machine using a packaging film folding device according to the present invention, FIG. 2 is a schematic front view, FIG. 3 is a schematic plan view of a packaging film conveying device, and FIG. 4 is X-X in Figure 3
5 and 6 are partial sectional views showing the clamped state by both the front and rear presser members, FIG. 7 is a schematic side sectional view of the folding device and the unloading device, and FIG. 8 is a schematic front sectional view. 9 is a schematic plan view of the folding device, FIG. 10 is a schematic side sectional view, and FIG. 11 shows the state of engagement between the guide piece of the rear folding member and the guide groove of both the left and right folding members in the folding device. Fig. 12 is a sectional view showing an item packaged with a packaging film;
FIG. 3 is an explanatory view of the operation of a conventional packaging film folding device, and FIGS. 14 and 15 are operation explanatory diagrams of the packaging film folding device according to the present invention. Conveying device...1, Round belt...22, 23, 3
3, 34, Front presser member...26, Pressure receiving plate...2
7. Rear holding member...37, Pressure plate...38, Folding device...76, Rear folding member...77, Left and right folding members...82, Folding edge adjustment member...18
6. Auxiliary folding part...187, Front folding member...
89, Conveyor...104, Folding section...R, Packaging section...S, Item...W, Packaging film...
F.

Claims (1)

[Scope of Claims] 1. A first folding member 89 and a second folding member 77, which are movable relative to each other, are provided on two opposing sides of the four peripheral parts, and the other two opposing sides There are first and second folding members 89, 77.
Third and fourth folding members 82 are provided which are rotatably supported in a direction perpendicular to the spanning direction, and the first folding member 89 of the second folding member 77 is provided.
The third and fourth folding members 8
In the packaging film folding device, the first to fourth folding members 89, 77, 82 are interlocked so as to be openable and closable with each other, and a folding portion R is formed between the first to fourth folding members 89, 77, 82 in which the folding members 89, 77, 82 are close to each other. A folding edge adjustment member 186 that can protrude toward the folding part R side is provided at the intermediate part of the folding edge 82a of both the third and fourth folding members 82, which is on the folding part R side. And the tip edge 82b of the fourth double-folding member 82 has this tip edge 82.
The auxiliary folding part 187 that is movable along the folding part R is projected, and the folding edge adjustment member 186 is
A packaging film folding device for a packaging machine, characterized in that the folding edge adjusting member 186 and the auxiliary folding portion 187 are connected to each other so that the auxiliary folding portion 187 also moves toward the folding portion R side as the auxiliary folding portion 187 protrudes to the side.