JPH0629052B2 - Film lifting device for packaging in packaging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fruit and vegetable wrapping machine for wrapping a particularly flexible tray, in which a wrapping film stretched and held in the wrapping portion is folded with respect to the tray. The present invention relates to a packaging film pushing-up device used to cover an article with a packaging film from above when the packaging film is inserted.

(Prior Art) Conventionally, for example, in a film pushing device in a packaging machine described in Japanese Patent Laid-Open No. 61-142109, a pair of upright rods that support both sides of a frame of a pushing member are provided with a pair of lower end portions. By connecting the levers and tilting the levers in the vertical direction, the lifting member is moved up and down.

(Problems to be solved by the invention) However, since the tilt amount of the lever is always constant and the uppermost moving position of the frame body of the lifting member is also constant, the height of the packaged item is changed. In this case, there is a problem that the product is excessively pressed against the film to be damaged, or conversely, the degree of expansion of the film is insufficient and wrinkles are generated on the film during packaging.

Configuration of the Invention (Means for Solving the Problems) Therefore, in order to solve the above problems, the present invention has a transporting device for transporting a band-shaped packaging film to a packaging unit, and a vertical movement corresponding to the packaging unit. A push-up member that is provided so as to push up the packaging film that has been stretched in the packaging portion when rising, and an item that is transferred from the item supply device to the packaging unit after the film pushing operation by the pushing-up member. In a packaging machine provided with a push-up cradle device and a folding device that folds and wraps an item on the cradle device from the front, rear, left, and right directions of the packaging film, the push-up member is provided inside the packaging machine body. One end of a driving member that swings in the up-and-down direction around a shaft that is erected as a fulcrum is rotatably connected through the shaft, and one end of a driven member that reciprocates at a predetermined timing is connected to the driving member. To the reciprocating motion of The driving member is linked so as to swing in the vertical direction, and an operating member provided outside the packaging machine body is operatively connected to the driven member, and the reciprocating motion of the driven member is performed based on the operation of the operating member. The gist is that the range can be changed and adjusted.

(Operation) With the above configuration, when the operating member 212 is operated from the outside of the packaging machine main body, the reciprocating range of the driven member 202 is changed and adjusted, and accordingly, the amount of swinging of the driving members 173 and 201 in the vertical direction is adjusted. Is also changed. As a result, the uppermost movement position of the push-up member 171 that pushes up the packaging film F can be changed and adjusted.

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

1 to 4 show a round belt type conveying device 1 arranged on the upper part of the machine frame, and as shown in FIG.
The leading end of the wrapping film F is guided and set, and from this set state, the wrapping film F is spread on the wrapping section S of FIG.

1, 3 and 4 show a packaging film folding device 76 arranged above the conveying device 1, and a fixed front folding member 89 and a front-back direction so as to approach and separate from the front folding member 89. The rear folding member 7 and the left and right folding members 82 supported by the lower left and right ends of the rear folding member 77 so as to be rotatable in the left and right directions.
The left and right folding members 82 are interlocked with each other so that they can be opened and closed with the forward and backward movement of 7.
The folding members 89, 77, 82 approach each other between 9, 77, 82, and the packaging film F is provided below the article W with respect to the article W.
Is a fold portion R into which is folded. The folding part R corresponds to the packaging part S of the carrying device 1 as shown in FIG. Numeral 151 is above the rear folding member 77 and is located on both left and right folding members 8.
2 is a pair of mounting members that are rotatably supported in the left-right direction corresponding to 2, and are always urged to open each other.
The opening of the mounting member 151 is regulated as the rear folding member 77 moves back and forth. Reference numeral 161 denotes an extruding member that is supported above both the mounting members 151 so as to be movable in the front-rear direction, and reciprocates from the rear position to the vicinity of the front folding member 89. A belt conveyor 104 is supported above the push-out member 161 so as to be movable in parallel in the vertical direction, and corresponds to the packaging unit S of the transport device 1.

As shown by a white frame in FIGS. 1 and 2, reference numeral 46 is a cradle device which is vertically moved between the inner end portion of the supply device 45 and the packaging portion S and the folding portion R, and is tiltably attached. A plurality of loading tables (not shown) that are energized are provided, and the feeding device 4 is at the lowest position.
Item W is transferred from 5 and placed. (See Japanese Patent Laid-Open No. 59-166819) In FIGS. 1 to 4, reference numeral 26 denotes a front pressing member inserted in the front side of the packaging section S of the packaging film transport apparatus 1, and 37 also in the rear side. And the packaging section S
The both front and rear edges of the packaging film F stretched on the above are clamped by these pressing members 26 and 37. Reference numeral 43 denotes a saw blade mounted in the vicinity of the film supply port P of the packaging film transporting device 1 so as to form perforations at regular intervals during the transportation of the packaging film F. Reference numerals 47, 47 are heater devices on which a packaged product carried out from the folding member 89 is placed.

As shown in FIGS. 1 and 5 to 10, 171 is vertically rotatable with a shaft 173a with respect to the distal end portions of a pair of levers 173 fixed to a shaft 172 on the left and right sides of the pedestal device 46. And a pair of upright rods 171a extending upward from the shaft 173a.
And a frame 171b that is detachably inserted between the upper ends of both upright rods 171a. A lever 174 is rotatably connected to a middle portion of both upright rods 171a with a shaft 174a so that a parallel crank mechanism is formed. Is configured. Reference numeral 215 is an abutting member attached to the lower end of the upright rod 171a, and 216 is a regulating member located below the upright rod 171a.
The lowermost moving position of the pushing-up member 171 is determined by the lowering of 1a and the contact member 215 contacting the regulating member 216. As shown in FIGS. 1 and 2, this lowermost movement position corresponds to the article transfer route of the article W from the supply device 45 to the cradle device 46, and does not hinder the delivery of the item W. It is said to be high. 17
Reference numeral 7 denotes a pair of pressing members provided on both the left and right sides of the frame body 171b, which are vertically moved by a solenoid (not shown) at arbitrary timing. 18
Reference numeral 2 denotes a pair of pressure receiving plates fixed to the machine frame above the left and right pressing members 177 so as to face them.

Reference numeral 201 denotes a connecting rod which is fixed to the rotating shaft 172 and is integrally rotatable with the lever 173 in the vertical direction. The connecting rod 201 and the lever 173 form a driving member. A front end of a male screw rod 202 as a driven member that extends in the front-rear direction and is rotatable in the circumferential direction is attached to the upper end of the connecting rod 201.
Reference numeral 203 denotes a lever that can be tilted in the front-back direction about a shaft 204, and has a female screw member 20 attached to its upper end.
The male screw rod 202 is screwed into the member 5. Reference numeral 206 denotes a stopper screwed to the male screw rod 202 so that the position of the male screw rod 202 can be adjusted back and forth, 207 denotes a connecting member attached to the rear end of the male screw rod 202, and a female screw of the lever 203 between the two 206, 207. The member 205 is adapted for position adjustment. The connecting member 207 is formed with a recess (not shown) that opens rearward.

Reference numeral 208 denotes a guide cylinder whose front end is axially mounted in the recess of the connecting member 207 in a loosely fitted state.
07 is rotatable up and down with respect to the connection member 207
At the same time, it is possible to rotate in the circumferential direction. The male screw rod 202 and the guide cylinder 208 are allowed to bend in the vertical direction at the connecting member 207. A guide groove 209 is formed in the guide cylinder 208 so as to extend almost entirely along the length thereof.

Reference numeral 210 denotes a rotary shaft which penetrates the fixed frame 2 and is loosely inserted into the guide cylinder 208, and a slide pin 211 which is engaged with the guide groove 209 is formed at a front end portion thereof. Then, within the length of the guide groove 209, the guide cylinder 208
Moves on the rotation shaft 210. In addition,
A handle 212 is attached to the rear end of the rotary shaft 210 outside the fixed frame 2. And the handle 21
By rotating 2 in the forward and reverse directions, the female screw member 205
Moves on the male screw rod 202 to adjust the front-back position of the lever 203.

A cam 213 is driven to rotate by a drive source (not shown) and is in contact with a cam follower 214 attached to the lever 203. Then, with the rotation of the cam 213, the lifting member 171 is moved up and down via the lever 203, the male screw rod 202, the connecting rod 201, and the pair of levers 173.

Next, the vertical movement of the push-up member 171 by the cam 213 will be described with reference to FIGS.

First, the cam 213 is moved from the initial position shown in FIG.
When it is rotated in the 0 direction, the cam surface of the cam follower 21
4, the lever 203 starts tilting forward.
In response to this, the male screw rod 202 moves forward, the pair of levers 173 tilts upward via the connecting rod 201, the both upright rods 171a move upward, and the frame body 171b moves the packaging part S. And moves upward toward the folding part R. And
As shown in FIG. 7, when the frame body 171b reaches the vicinity of the pressure receiving plate 182, the solenoid is operated and the pressing member 177 is operated.
Is pressed against the pressure receiving plate 182, and both sides of the packaging film F are sandwiched between the both 177 and 182.

Further, the frame body 171b continues to move upward as the cam 213 rotates, and as shown in FIGS.
At the position where 0 abuts on the cam follower 214 of the lever 203, the frame body 171b reaches its uppermost moving position. After that, the frame body 171b starts moving downward in response to the rotation of the cam 213, and when the cam 213 returns to the initial position, the frame body 171b reaches its lowermost moving position as shown in FIG.
Immediately before the frame body 171b is positioned below the pressure receiving plate 182 and the left and right folding members 82 start the folding operation, the solenoid is actuated and the pressing member 177 moves downward to separate from the pressure receiving plate 182.

By the way, the uppermost moving position of the frame body 171b becomes higher in proportion to the initial position shown in FIG. 5, that is, the backward tilting amount of the lever 203 when the pushing-up member 171 is at the lowermost moving position. This is because the lever 203 tilts most forward because the apex 30 of the cam 213 is as shown in FIGS.
0 and the cam follower 214 are in contact with each other, and the most tilted position is always constant. Therefore, the closer the lever 203 is to the rear in the initial position, that is, the closer the cam 213 and the cam follower 214 are to each other, the more the cam 2 moves.
The amount of tilting forward due to the rotation of 13 becomes large. Then, the amount of forward movement of the male screw rod 202 increases in accordance with the amount of rearward tilting of the lever 203, and the connecting rod 20
This is because the amount of forward tilting of No. 1 and the amount of tilting upward of the lever 173 also increase, and thus the amount of upward movement of the upright rod 171a also increases. In other words, when the cam 213 and the cam follower 214 are always in contact with each other, the uppermost moving position of the frame body 171b becomes the highest, and the cam follower 214 moves the cam 2
The position becomes lower as the distance from 13 increases.

Therefore, when the height of the item W is low, the handle 212 is rotated to move the lever 203 as shown by the chain double-dashed line in FIG.
Move the cam follower 214 to the cam 2
Separated from 13. Then, the cam 213 does not come into contact with the cam follower 214 until it rotates to a certain degree, and the lever 20 is not contacted until the two 213 and 214 come into contact with each other.
The tilting of No. 3 and the upward movement of the pushing-up member 171 are started. Then, the apex 300 of the cam 213 and the cam follower 2
The frame 17 of the push-up member 171 at the contact position with
1b reaches the uppermost moving position. As described above, the uppermost moving position of the frame body 171b in this case becomes lower as the cam follower 214 moves away from the cam 213. On the contrary, when the height of the article W is high, the handle 212 is rotated in the opposite direction to the above, and the cam follower 214 and the cam 21 are rotated.
You should bring 3 and 3 closer together.

In this way, by appropriately changing the front-back position of the lever 203 with the handle 212, the uppermost moving position of the frame body 171b can be adjusted according to the height of the item W, so that the extension degree of the packaging film F is optimized. The product W can be packaged as a product, and the soft product W is excessively pressed against the film F to be damaged, or conversely, the degree of extension of the film F is insufficient, so that the film F is wrinkled when the product W is packaged. There is no fear that it will occur. Further, it becomes possible to change the tension of the film F according to the softness of the products W having the same height and package them.

On the other hand, the lowermost moving position of the frame body 171b is the upright rod 171a.
Since the contact member 215 at the lower end of the frame contacts the regulating member 216, the frame body 171b is always kept at a constant height even if the upward movement amount is changed. Therefore, when the article W is transferred from the supply device 45 to the cradle device 46, the frame body 171
The packaging work can be smoothly continued without any hindrance to b.

Next, the outline of the actual packaging action will be described.

When the item W (the item in which the items are stored in the tray) is placed on the supply device 45, the item W is transferred and placed on the cradle device 46 that has moved downward. At this time, as shown in FIG. 5, the push-up member 171 is already at the lowermost moving position, and the rear folding member 77 is retracted.

When the transport device 1 is driven in synchronization with this feeding, the starting end of the packaging film F located at the supply port P is transported toward the packaging portion S at the center of the transport device 1. In the middle of the process, the saw blade 43 forms perforations in the width direction for each constant length of the packaging film F, and the supply port P is momentarily braked to pull the packaging film F,
This tensile force cuts the perforations and conveys them to the packaging section S.

The wrapping film F on the wrapping portion S is the front and rear pressing members 26,
It is pinched by the upward movement of 37.

When the push-up member 171 is moved upward from this packaging film set state, when the frame 171b reaches the packaging film F as shown in FIG. 7, the solenoid is driven to move the left and right pressing members 177. It abuts the pressure receiving plate 182 and also clamps both left and right edges of the packaging film F. Then, as shown in FIGS. 2 and 8, the packaging film F is attached to the frame body 1.
It is pushed up at 71b and stretched. Thus, if the packaging film F is clamped not only at the front and rear edges but also at the left and right edges, the packaging film F is uniformly stretched and is not wrinkled when pushed up by the frame 171b.

Next, as shown in FIG. 9, the cradle device 46 moves upward to bring the article W into contact with the packaging film F, and as shown in FIG. 10, the frame body 171b of the push-up member 171 moves the packaging film F. The product W is covered with a wrapping film F from above. At this time, the product W is pressed from above by the extension of the packaging film F, but the packaging film F is not usually contracted so much in a short time until the end of the packaging after being stretched by the upward movement of the frame body 171b. W does not have much pressing force. The left and right pressing members 177 are separated from the pressure receiving plate 182 by the left and right folding members 82 immediately before folding, and the sandwiching of the left and right side edges of the packaging film F is released. By this release, the pressing force on the article W is further reduced.

In this way, since the dedicated pushing member 171 is used without directly pushing up the packaging film F with the article W or the tray, the tray is deformed even when packaging a flexible tray or a tall tray. Then, there is no risk that the soft contents in the tray will be crushed.

Further, as described above, since the pressing member 177 is configured to be moved up and down by the solenoid, compared to the case where the pressing member 177 is interlocked with the frame body 171b, an accurate timing is obtained immediately before the folding by the left and right folding members 82. Thus, the pressing member 177 can be separated from the pressure receiving plate 182, and wrinkles or the like do not occur in the film F when folded from the left and right, and the appearance of the packaged product W is not damaged.

Thereafter, as shown in FIGS. 9 and 10, the rear folding member 77 in the retracted position advances as the pedestal 46 moves upward. With this forward movement, both mounting members 151 approach each other. The both mounting members 151 push the packaging film F toward the lower side of the article W on the mounting table of the receiving device 46, and contact the mounting table at a position slightly separated from the lower surface of the tray. When they come into contact with each other and are tilted, they enter below the article W and are placed thereon. 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. Next, the rear folding member 77 and the left and right folding members 82 are placed on both the mounting members 15.
As in the case of 1, the rear folding member 77
When the item W has sufficiently entered below the item W, the two mounting members 151 are separated from each other and separated from the item W, and the item W is placed on the rear folding member 77. Then, when the cradle device 46 moves down again, the packaging film F is folded from the rear and left and right directions below the article W while the article W is placed on the rear folding member 77. In synchronization with this folding operation,
The holding by the rear pressing member 37 is released, and the front pressing member 26
Keep only clamped by.

At the time of folding, the pushing member 161 moves forward and approaches the article W. Then, when the pushing member 161 further moves forward and pushes the article W, the holding by the front pressing member 26 is released and the belt conveyor 104 moves. Is rotated. Then, the article W is conveyed forward by the forward movement of the pushing member 161 in a state of being separated from or in contact with the belt conveyor 104, supported by the belt conveyor 104 from above and prevented from swinging, and the rear folding member 77.
It is transferred from above to the front folding member 89. In the middle of the transfer, the packaging film F hits the front folding member 89 and is folded also from the front side on the lower side of the article W, and the folding from the left side overlaps with the folding from the rear side, and the folding from the front side also overlaps. It will be the folding part on the lower side. Next, the rear folding member 77 retracts, the left and right folding members 82 open with each other as the rear retracts, and the pushing member 161 also retracts.

After packaging, the same article W is carried out to the heater device 47, and the folded portion is brought into close contact therewith to complete one step.

It should be noted that the present invention is not limited to the above-described embodiments, and it is needless to say that the following modifications can be made at any time without departing from the spirit of the invention.

As shown in FIG. 11, the lever 17 of the parallel crank mechanism is used.
4, the upright rod 171a is vertically slidably inserted into at least one guide 221 that is immovably fixed. Then, the lever 173 and the upright rod 171a are connected so that the upright rod 171a moves linearly up and down. In this case, the adjustment of the uppermost moving position of the frame body 171b is performed by the relationship between the cam 213 and the cam follower 214 as in the other example.

As described above in detail, according to the present invention, when the operating member 212 is operated from the outside of the main body of the packaging machine, the reciprocating range of the driven member 202 is adjusted and the swing amount of the driving members 173, 201 is adjusted to push up the lifting member. Since the amount of upward movement of 171 is changed and the uppermost moving position of the push-up member 171 can be appropriately changed according to the height of the item W, the extension degree of the packaging film F is optimized and the item W is packaged. It has an excellent effect that it can.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view of a wrapping machine for fruits and vegetables using a wrapping film lifting device according to an embodiment of the present invention.
The figure is a schematic cross-sectional view of the packaging machine seen from the line XX in FIG.
FIG. 3 is an enlarged schematic side sectional view of the folding device and the unloading device.
4 is a schematic enlarged cross-sectional view of the two devices as seen from the line XX in FIG. 1, FIG. 5 is a schematic side view showing the lifting member and the left and right pressing members, and FIG. 6 is a schematic plan view of the same. FIGS. 7 to 10 are schematic side views showing the vertical movement of these and the positional relationship between these and the cradle device, and FIG. 11 is a schematic side view showing another example of means for adjusting the amount of pushing of the pushing member. It is a figure. Unloading device 1, feeding device 45, cradle device 46, folding device 7
6, push-up member 171, lever 17 that constitutes a drive member
3, similarly the connecting rod 201, the shaft 173a, the driven member 20
2, the operation member 212, the packaging film F, the packaging section S, the item W.

Claims (1)

[Claims] 1. A transporting device (1) for transporting a strip-shaped packaging film (F) to a packaging section (S), and a vertically movable unit corresponding to the packaging section (S), which is packaged when rising. The push-up member (171) for pushing up the packaging film (F) spread on the section (S) and the product (W) transferred from the article supply device (45) are formed by the push-up member (171). After the pushing-up operation, the cradle device (46) is pushed up to the packaging section (S), and the packaging film (F) is attached to the article (W) on the cradle device (46) from the front, rear, left and right directions. In a packaging machine provided with a folding device (76) for folding and packaging, a drive member (which swings in the up-and-down direction around a shaft (172) installed in the packaging machine body as a fulcrum is provided in the pushing-up member (171). Rotate one end of 173, 201) via the shaft (173a) The driving member (173, 201) is connected to the driving member (173, 201) at one end of the driven member (202) that reciprocates at a predetermined timing. An operating member (212) provided outside the packaging machine body is operatively connected to the driven member (202) so as to swing in the vertical direction, and the driven member is driven based on the operation of the operating member (212). A packaging film lifting device in a packaging machine, wherein the reciprocating range of the member (202) can be changed and adjusted.