JPH0541490B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Purpose of the Invention (Field of Industrial Application) This invention is particularly directed to a fruit and vegetable packaging machine for packaging flexible trays, in which a packaging film developed and gripped by the packaging section is folded onto the tray. The present invention relates to an article unloading device installed above a folding device for packaging articles.

(Prior Art) Conventionally, for example, in the packaging machine described in JP-A No. 58-90010, the packaging film stretched in the packaging section 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 is tilted inward by contact with the rear folding member and both left and right folding members. Then, as 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 bottom of the tray on the mounting table and contact 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 transferred 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 the 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,
Along with the retreat, the left and right insert members also open from each other.

(Problems to be Solved by the Invention) The conveyor belt is made of sponge to prevent the tray from being pushed up and crushed by the packaging device. However, when packaging particularly flexible or tall trays, the repulsive force of the sponge belt may deform the tray and crush the soft items inside the tray, causing a decline in product value. It was also getting old.

Structure of the Invention (Means for Solving the Problem) The present invention has been made in view of this problem, and as shown in the drawings of the embodiment described later, the link 102 is connected to the support shaft 103 fixed to the machine frame side. The link 113 is supported rotatably in the vertical direction, and the link 113 is supported rotatably in the vertical direction with respect to a support shaft 114 which is also fixed to the machine frame below the support shaft 103.
A link 116 is connected between the two links 102 and 113 with shafts 116a and 116b to have a rotation function in front of both the support shafts 103 and 114, thereby forming a four-bar link mechanism. When carrying out goods in a packaging machine, in which a conveyor 104, on which an endless elastic belt 104a is stretched, is always supported almost horizontally above the packaging section S, the base end of the conveyor 104 is attached to the four-bar link mechanism in the vertical direction. A shaft 11 supported at one point so as to be rotatable to
6b, and the conveyor 104 is provided with an abutting part 115 that comes into contact with a part of the four-bar linkage mechanism based on a downward moment centered on the axis 116b when the conveyor 104 is in a substantially horizontal state.
The conveyor 104 is in a nearly horizontal state due to contact with the conveyor 104.
With the displacement of the four-bar linkage mechanism, the shaft 116
b so as to be movable in the vertical direction, and as the abutting portion 115 is spaced apart, the shaft 116
The four-bar link mechanism is suspended from the machine frame by a spring member 122, and the conveyor 104, which is in a substantially horizontal state, is moved upward by the biasing force of the spring member 122. It was designed to help.

(Function) When the pushing force of the article W to be carried out is applied from below to the belt 104a of the conveyor 104, the conveyor 104 not only tilts upward on the axis 116b, but also is assisted by the biasing force of the spring member 122. and then lifted upwards together with the four-bar linkage.

(Example) Hereinafter, the outline of a packaging mechanism equipped with an article discharging device according to an embodiment of the present invention will be described in 1 to 4.
This will be explained according to the diagram.

1 and 2 show a round belt type film transport device 1 installed on the upper part of the machine frame, and as shown in FIG. From this reset state, the packaging film F is spread onto the packaging section S shown in FIG. 1 by driving the conveying device 1.

As shown in FIGS. 1 and 2, a packaging film folding device 76 is installed above the packaging film conveying device 1, and as shown in FIG. A rear folding member 82a is a rear folding member 82a in which both sliders 79, which are supported so as to be movable in the front and rear direction with respect to the rear folding member 78, are connected by a connecting plate 80 and rollers 81 on both front and rear sides thereof. Both left and right support members 82 are supported movably in the left and right direction with respect to a support plate 83 installed between the ends, and 82 denotes both support members 82a.
It is a left and right folding member which is attached to a shaft 84 so as to be rotatable in the left and right direction. An auxiliary folding plate 86 is screwed so that its position can be adjusted.

Reference numeral 89 denotes a front folding member installed between the front ends of both the rails 78, which includes both front and rear conveyance rollers 90 and a folding roller 91 provided behind the rear side conveyance roller 90. A plurality of round belts 90a are stretched between the belts 90,
A round belt 90b is stretched between the rear conveyance roller 90 and the folding roller 91 at both ends, so that both round belts 90a and 90b rotate only in the direction of arrow C.

Reference numeral 140 denotes a threaded rod supported on the support plate 83 so as to extend in the left-right direction, and is formed with a left-hand threaded portion 140a and a right-handed threaded portion 140b.
2a is screwed into the left-hand threaded portion 140a, and the other support member 82a is screwed into the right-hand threaded portion 140b. 141 is an electric motor installed on the machine frame behind the left and right support members 82a, and a pulley 142a of its output shaft 141a is connected to a pulley 142b attached to a threaded rod 140 between both left and right support members 82a. are interlocked via a flat belt 142. When the threaded rod 140 is rotated by the electric motor 141, the left and right support members 82a move on the left and right threaded portions 140a and 140b, approaching or separating from each other.

In FIGS. 3 and 4, reference numeral 143 denotes an L-shaped guide plate fixed to the front portions of the left and right support members 82a, and includes a base plate portion 143a extending to both left and right sides, and a base plate portion 143a extending forward along the rail 78 from its tip. The engaging plate portion 143b extends from the engaging plate portion 143b.
A roller 144 attached to the tip of b is supported so as to be movable in the left-right direction with respect to a rail portion 145 on the machine frame. When the left and right support members 82a move in the left and right direction, the left and right guide plates 143 also move in the same direction along with this movement. 146 is the engagement plate portion 14 of the guide plate 143
3b, a guide groove 147 is formed to extend in the front-back direction, and a guide pin 147 is engaged with the guide groove 146, and is protruded from the slider 79 of the recessed member 77 below the engagement plate portion 143b. It is supported movably in the left and right direction with a long hole 148 on the projecting plate portion 79a. 149 is the lower end of the guide pin 147 and both left and right folding members 8
This is a link that is rotatably supported between the front end sides of 2 and 2. Then, the rear folding member 77
When the slider 79 moves forward and backward along the rail 78, the guide pin 147 moves to the guide plate 143.
The left and right folding members 82 are rotated about the pivot point 84 by the link 149 to open and close each other. Further, when the left and right support members 82a approach and separate from each other, the guide pin 14
7 moves along the elongated hole 148 of the slider 79, the left and right folding members 82, the guide plate 143, the guide pin 147, and the link 149 move in parallel in the left-right direction while maintaining the same positional relationship.

In FIGS. 1 and 2, 93 is a bracket erected on the rear end of the rail 78, and 94 is a support shaft 9 rotatably installed between the upper parts of the brackets 93.
5, and is rotatably attached to a shaft 96a with respect to an interlocking rod 96 that is driven up and down. 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 mounted on the shaft.

When the movement rod 96 is in the upward movement position, the rear folding member 77 is in the retracted position as shown in FIG. 3, 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 is pushed forward by the lever 97 and the link 98 as shown in FIG. The position of the groove 146 is regulated, and both the left and right folding members 82 close to each other via the link 149, and these front, rear, left and right folding members 8
The area between 9, 77, and 82 is defined as a folded portion R. As shown in FIG. 1, this folding section R corresponds to the packaging section S of the packaging film conveying device 1.

1 and 2 show a device 101 for discharging goods W,
102 is a pair of links rotatably supported on both sides of a support shaft 103 installed between the lower portions of both brackets 93; 113 is a support shaft installed below the support shaft 103 between both brackets 93; 1
A pair of links rotatably supported on both sides of 14, each link 102, 113
extend forward from the support shafts 103 and 114. 1
Reference numeral 16 denotes an L-shaped interlocking link which is rotatably connected between the tips of the links 102 and 113 with shafts 116a and 116b. roller 120
is attached. Reference numeral 104 denotes a conveyor on which an endless belt 104a made of sponge is stretched, and is supported rotatably in the vertical direction with respect to the shaft 116b at a guide plate 115 as a contact portion extending rearward from both sides of its rear end. The guide plate 115 is placed on the roller 120 of the interlocking link 116, and is supported horizontally on the packaging section S of the packaging film conveying device 1. 117 is a connecting rod connected between both the interlocking links 116;
Reference numeral 8 denotes a handle rotatably supported on a support rod 119 installed between the upper parts of both brackets 93, and a threaded rod 118a thereof is connected to the connecting rod 117.
are screwed together. And the threaded rod 118a
A tension spring 122 as a spring member that suspends and supports the four-bar link mechanism is disposed between the four-bar link mechanism and the interlocking link 116 of the four-bar link mechanism. The links 102, 113, 116 constitute a four-bar link mechanism in which the two support shafts 103, 114 are fixed nodes, and the connecting rod 117, handle 118, and support rod 119 constitute a four-bar link mechanism. constitutes vertical position holding means. .

Then, when the handle 118 is rotated, the connecting rod 117 moves along the threaded rod 118a, and both the links 102 move vertically around the support shafts 103 and 114, and the guide plate 11 of the conveyor 104
While the rollers 120 of the interlocking link 116 slide on the conveyor 104, the conveyor 104 moves in 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 114.
A round belt 110 is hooked between both belt pulleys 108 and 109. Reference numeral 121 denotes an idler pulley fixed to the guide plate 115 of the conveyor 104, which tensions the round belt 110. 11
1 is the support shaft 1 so as to be interlocked with the belt pulley 109.
The sprocket is rotatably supported relative to the sprocket 14, and is driven and rotated by the 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 round belt 110 and the belt pulley 108. However, since the sprocket 111 is supported on the spindle 114 by the one-way clutch 111a, the rotation of the chain 112 is not transmitted to the sprocket 111, and the belt 1 of the conveyor 104 is
04a does not rotate in reverse.

In FIG. 1, 45 is the film conveying device 1.
A belt conveyance type product supply device 46 is installed below the machine frame both inside and outside the machine frame, and 46 is a quality pedestal device that is moved up and down between the inner end of the product supply device 45 and the packaging section S and the folding section R. It is equipped with a plurality of loading tables 46a biased to be tiltable, and the article W is transferred from the article supply device 45 and placed thereon at the lowest moving position, and is positioned by a stopper 47. .

In FIGS. 1 and 2, reference numeral 26 denotes a front press member attached to the front side of the packaging section S of the packaging film conveying device 1, and numeral 37 denotes a rear press member attached to the rear side of the packaging section S. Both front and rear edges of the packaging film F stretched are pressed against these pressing members 26,
37. Reference numeral 43 denotes a sawtooth mounted near the film supply port P of the packaging film conveying device 1, and is adapted to form perforations at every predetermined length of the packaging film F during its conveyance. 48 is a heater device on which the packaged goods carried out from the front folding member 89 are placed.

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

When an item W (a tray containing items) is placed on the item supply device 45 before operation, the distance between the pivot points 84 of the left and right folding members 82 is automatically adjusted according to the item W. be done.

Next, by driving the article supply device 45, the article W
is transferred and placed on the pedestal device 46 that has moved downward. At this time, the rear folding member 77 is connected to the interlocking rod 96.
It retreats due to the upward movement of.

When the film transport device 1 is driven in synchronization with this feeding, the packaging film F located at the supply port P is
The starting end of is transported toward the packaging section S in the center of the transport device 1. During the conveyance, perforations are formed in the width direction of the packaging film F by the sawtooth 43 at every predetermined length, and an instantaneous brake is applied at the supply port P to pull the packaging film F, and this tensile force causes cut at the perforation,
It is transported to the top of the packaging section S.

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

Next, when the pedestal device 46 moves upward and the product W pushes up the packaging film F, the product W is covered with the packaging film F.

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, both the left and right folding members 82
also approach each other. Next, when the rear folding member 77 and both the left and right folding members 82 enter below the article W, and the pedestal device 46 moves downward again, the article W is placed on the rear folding member 77 and backwards under the article W. The folding operation of the packaging film F is performed from both left and right directions. 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.

After that, when the belt 104a is rotated and the clamping by the front presser member 26 is released,
The article W is carried forward and transferred from the rear folding member 77 to the front folding member 89. 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. The lower side of the article W becomes a folding part. Next, the interlocking rod 96 is moved upward again to move the rear folding member 77 backward, and as the rear folding member 77 moves backward, both the left and right folding members 82 open from each other.

In particular, when packaging a flexible tray or a tall tray, the sponge belt 104a may bend under the upward force of the item W from below, and the item W may be affected by the repulsive force. In this case, since the conveyor 104 tilts upward, the force is alleviated, and there is no possibility that the tray will be deformed and the soft items stored in the tray will be crushed.

Moreover, the conveyor 104 has a tension spring 122
Since the belt 104 is suspended by
When the pushing force of the article W is applied to a from below, it not only tilts upward about the shaft 116b but also lifts upward together with the four-bar link mechanism. Therefore, the force pushing up the item W is further relaxed.

After packaging, the same item W is carried out to the heater device 48,
There, the folded parts are brought into close contact and one process is completed.

Effects of the Invention As detailed above, according to the present invention, with a simple configuration, the upward force applied to the conveyor 104 from below is transferred upward around the rotational fulcrum of the conveyor supported at one point by the four-bar link mechanism. It can absorb not only the tilting movement but also the upward movement of the four-bar linkage mechanism itself with the help of the spring member 122, and even when packaging flexible or tall trays, the deformation of the tray and the soft objects stored in the tray can be absorbed. damage can also be prevented.

[Brief explanation of drawings]

1 to 4 show an embodiment embodying the present invention.
The figure is a schematic cross-sectional view taken from the line X-X in Figure 1,
The figure is a schematic plan view showing a packaging film folding device.
FIG. 4 is a partial sectional view showing the interlocking mechanism of the folding device. Film conveying device...1, Front presser member...2
6, Rear press member...37, Item feeding device...4
5. Product holder device...46. Film folding device...
...76, Rear folding member...77, Both left and right folding members...
...82, Front folding member...89, Article unloading device...
101, Link...102, Shaft...102a, Support shaft...103, Conveyor...104, Belt...
104a, link...113, roller...113
a, Support shaft...114, Guide plate as a contact part...
...115, Movement link...116, Axis...116
a, 116b, connecting rod...117, handle...
118, Threaded rod...118a, Support rod...11
9. Roller...120, Tension spring as a spring member...122, Wrapping film F, Wrapping section S, Folding section R, Item W.

Claims (1)

[Scope of Claims] 1. The link 102 is rotatably supported in the vertical direction with respect to a support shaft 103 fixed to the machine frame side, and a support shaft also fixed to the machine frame side below the support shaft 103. 114, the link 113 is supported rotatably in the vertical direction, and both support shafts 103, 1
14, both the links 102, 1
13, a link 116 is rotatably connected with shafts 116a, 116b to form a four-bar link mechanism, and the conveyor 104, on which an elastic endless belt 104a is stretched, is constructed. In an article unloading device for a packaging machine that is always supported almost horizontally above the packaging section S, the four-bar link mechanism is provided with a shaft 116b that supports the base end of the conveyor 104 at one point so as to be rotatable in the vertical direction, and the conveyor 104 is is provided with an abutting portion 115 that abuts a part of the four-bar linkage mechanism based on a downward moment about the shaft 116b in the approximately horizontal state, and the abutting portion 115 maintains the approximately horizontal state. The conveyor 104 located at Further, the four-bar linkage mechanism is suspended from the machine frame by a spring member 122, and the biasing force of the spring member 122 assists the upward movement of the conveyor 104 in the substantially horizontal state. Product delivery device for packaging machines.