JP3560318B2 - Unpacking machine for film package - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a swing arm of a film package unpacking machine, and more particularly, to a film package in which articles to be packaged such as relatively light empty containers are piled up through an insole sheet and stretch-wrapped or shrink-wrapped. The present invention relates to an improved swing arm for opening a door, which is mounted on an unpacking machine for unpacking a body.
[0002]
[Prior art]
Conventionally, many empty containers such as glass bottles, PET bottles, and metal kettles are stacked on pallets via thick paperboard insole sheets, and the outside is shrink-wrapped or stretch-wrapped and delivered to beverage manufacturers, etc. It has been.
As an apparatus for automatically unpacking such a film package, proposals described in Japanese Patent Nos. 2,561,178, 2,561,203, 2,670,980 and 2,750,826 filed by the present applicant have been proposed. Has been done.
These unpacking devices are described in FIG. 1 in Japanese Patent No. 2561178, and basically have a structure as shown in FIG. In the case of such a device, the film is cut vertically by one side surface of the film package by the cutting device A, and the film is sandwiched by the upper grippers 6 at the tips of the pair of swing arms 1. Since the film is turned and the film is opened to the left and right so that the film is straight, the unpacking is performed. Therefore, no other devices can be installed upstream and downstream of the unpacking device, respectively, just as far as the tip of the swing arm immediately after the opening. Space is created.
[0003]
In order to prevent the installation space from being widened, Japanese Patent No. 2757141 filed by the present applicant discloses that a film near the lower end edge on both sides of the film package is adsorbed, and the film is roughly 90 degrees outward and rearward. There has been proposed a film packaging unpacking apparatus provided with at least four unpacking auxiliary suction cups which rotate and a mechanism for limiting the rotation angle of the swing arm to less than 90 °.
[0004]
According to this device, the problem of saving the installation space of the device can be solved, but both swinging arms are turned at an angle of less than 90 °, and after the film is opened, the swing arm is provided at the tip of the arm. When the upper gripper opens and releases the cut end of the film, the opened end of the film falls naturally, touching the packages stacked on the insole sheet, and Some of them may fall from the insole sheet. Also, when removing the film in the vicinity of the upper and lower ends on both sides behind the opened film by sucking the film with at least four suction cups, for example, the film is wrinkled or torn, and the film is abutted thereon. If the sucker does not completely absorb the film, the attraction force of the other three suckers will be extremely reduced, and the opened film may be dropped.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of such circumstances, and the problem is that the film is cut upward and downward on one side of the film package, and the film is sandwiched by upper grippers at the tips of a pair of swing arms. When the swing arm is swiveled to open the film to the left or right to open the package, the opened film can be reliably caught and removed without touching the packaged material, and upstream and downstream of the unpacking machine. Another object of the present invention is to provide a swing arm of a film package unpacking machine which minimizes a space in which other devices that can occur cannot be installed.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the swing arm of the film package unpacking machine of the present invention is a package in which objects to be packaged stacked on a pallet are packaged with a film, and the package is formed of at least two pillars located at the front and rear. It is set in place, and the film covering the front surface of the package is cut in the vertical direction, opened and closed on the left and right, and attached to an unpacking machine. And a pair of swing arms that open left and right around a fulcrum provided at a symmetrical position on both sides of the center of the rear side of the package and open the film. Is attached at a position where its full length is divided into two parts, and is provided with a second upper gripper which sandwiches the upper edge of the opened film at a position adjacent to the hinge at a position adjacent to the hinge. With the entire moving arm extended , At an angle not exceeding 90 °, and means to pivot outwardly just outside, and characterized in that a means for pivoting the rear of the fulcrum portion after the hinge.
[0007]
Means for pivoting outwardly at an angle not exceeding 90 ° with the entire swing arm extended, and means for pivoting only the portion behind the hinge outward and behind the pivot point, The air cylinder group (C1, C2) that operates in two stages, and the front part (1a) of the swing arm is moved in the same direction as the rotation direction of the rear part (1b) in conjunction with the operation of the air cylinder group in the second step. It can be constituted by a reversible motor (5) for turning in the opposite direction, and a transmission mechanism for transmitting the rotation of the motor to the turning axis (2a) of the front part (1a) of the swing arm.
[0008]
Also, instead of using the reversible motor and the transmission mechanism, the swing arm is provided with a spring that keeps the entire arm straight during the first stage operation of the air cylinder group, and a (first) In the stage, a slot for preventing the operation of the (first) air cylinder (C1) from being transmitted to the front portion of the swing arm is provided near the front end. In order to bend the part inward, a configuration may be adopted in which a connecting bar is attached to the part to be anchored to a rear frame.
Further, instead of the air cylinder group that operates in the two stages, a servo motor that rotates forward and backward by a command from a control system may be used.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings, but the present invention is not limited thereto.
FIG. 1 is a plan view of a swinging arm for opening a film according to an embodiment of the present invention. The unpacking machine shown in FIG. 10 (for example, the unpacking machine described as FIG. 1 in Japanese Patent No. 2561178). 1) shows the swing arm of the present invention mounted as a swing arm 1 for opening a cut film. FIG. 2 is an enlarged view of a main part of the swing arm in FIG. 1, and FIG. 3 is an enlarged side view of a main part of the swing arm. Both figures are partially cut away and / or omitted. FIG. 4 is a cross-sectional view taken along line XX ′ of FIG. 3 and shows an end surface of the second upper gripper. FIG. 5 is a plan view showing a first stage in which the swing arm shown in FIG. 1 opens the cut film, and FIG. 6 is a plan view showing a state in the second stage.
[0010]
In the drawing, reference numeral 1 denotes a swing arm for opening the film, 1a denotes a front portion of the swing arm, 1b denotes a rear portion, 2 denotes a hinge, 3 denotes a second upper gripper, and 4 denotes a pivot or a pivot of the entire arm or the rear portion of the arm. Shaft, 5 is a reversible motor, 6 is the first upper gripper, 7a, 7b, 7c is a lever, 8 is a connecting rod or bar, 9 is a pulley, 10 is a belt, 20 is a rear support, 21 is a carriage, and 21a is a carriage. Carriage beam, 22 a presser plate, 23 a pusher, 24 a converging ring of the removed film, 25 a discharge nip roller group, L a film package, F a film, C1, C2, C3, C4, C5, C6 , C7, C8 are air cylinders.
[0011]
As shown in FIG. 1, the pair of swing arms 1 are mounted so as to pivot about fulcrums 4 at both ends of a beam 21 a of a carriage 21 that moves up and down along a column 20 behind the unpacking machine.
As shown in FIG. 3, the swing arm 1 has a first upper gripper 6 which moves up and down by an air cylinder C6 at the tip thereof, and further opens and closes by a pair of air cylinders C7. . (This structure is the same as the unpacking machine described in the aforementioned Japanese Patent No. 2561178). As shown in FIGS. 1 to 4, the swing arm 1 includes a front part 1a and a rear part 1b connected by a hinge 2 at a position where the entire length is substantially divided into two parts. A second upper gripper 3 for holding the upper edge of the door film at an intermediate position is mounted, and the gripper is moved up and down by an air cylinder C3 and opened and closed by an air cylinder C4. (FIGS. 3 and 4).
[0012]
In order to open the cut film F on the front surface of the packaged object L, each swing arm 1 is turned left and right, and two air cylinders C1 and C2 are connected in series. It is rotatably connected to a lever 7a fixed to the turning shaft 4. Of these two air cylinders, C1 is used for turning the entire swing arm 1 outward at an angle not exceeding 90 ° in the extended state without bending the entire swing arm 1 as the first stage of film opening. is there. The air cylinder C2 is for turning the rear portion 1b of the swing arm 1 outward and rearward from the turning fulcrum 4 as a second stage.
Further, when only the rear portion 1b of the swing arm is turned, a reversible motor 5 is mounted near the turning fulcrum 4 in conjunction with this so that the front portion 1a does not open further outward. It is connected to a pulley 9 mounted on the pivot 4 by a belt 10. The pulley 9 is simply rotatably fitted to the pivot 4 of the swing arm 1, but is fixed to a lever 7b, and a connecting rod 8 is rotatably connected to a lever 7c. Is fixed to the pivot 2a of the front part 1a of the swing arm at the hinge 2.
[0013]
Next, the operation of the swing arm will be described. In the unpacking machine described in Japanese Patent No. 2561178, during the step of vertically cutting the film covering the front surface of the film package L, the cutting unit once rises when it reaches near the upper end of the package. At this time, the (first) upper gripper 6 at the end of the swing arm 1 is lowered by the operation of the air cylinder C6, and then closed by the operation of the pair of left and right air cylinders C7. Hold the upper end of. Next, when the cutting unit moves up and completely cuts the film to the upper side (the above operation is described in detail in the aforementioned Japanese Patent No. 25616178), the film is opened by the swing arm device of the present invention. The door starts.
[0014]
First, as shown in FIG. 5, as shown in FIG. 5, when the air cylinder C1 is operated and the lever 7a is pulled, the swing arm 1 turns around the turning fulcrum 4 at an appropriate angle not exceeding 90 °. . At this time, the air cylinder C5 is operated to push the (first) upper gripper 6 sandwiching the cut end of the film from above forward, thereby tensioning the film F. Next, the air cylinder C3 is operated to close the (second) upper gripper, and to clamp the upper end of the film F that has been opened halfway at an intermediate position.
Next, as shown in FIG. 5, as a second stage, the air cylinder C2 is operated, the lever 7a is pulled, and the rear portion 1b of the swing arm 1 is moved outward around the pivot 4 and to the rear of the pivot 4. At the same time, the reversible motor 5 rotates, and the lever 7c is rotated in the direction of the arrow via the pulley 9, the lever 7b, and the connecting rod 8, respectively, whereby the front part 1a of the swing arm is rotated to the rear part 1b. Turn in the opposite direction. As described above, when only the rear portion 1b of the swing arm is turned, the front portion 1a can be prevented from opening further outward.
[0015]
When the second stage is completed, the air cylinder C5 operates in the reverse direction, the swing arm contracts, and the pusher 23 moves forward by the operation of the air cylinder C8, and pushes the opened film F into the focusing ring 24. At this point, the (first) upper gripper 6 and the (second) upper gripper 3 open to release the film F. The film F pushed between the upper and lower rollers of the discharge nip roller group 25 through the converging ring 24 by the pusher 23 is converged, compressed and discharged. These steps are described in the above-mentioned Japanese Patent No. 2,561,178. It is detailed in the gazette.
When the upper grippers 3 and 6 release the film, the air cylinder C2, the reversible motor 5 and the air cylinder C1 operate in the reverse order and in the reverse direction, and the swing arm 1 is in the position shown in FIG. Return.
[0016]
Next, a second embodiment of the present invention will be described with reference to FIGS. FIGS. 7, 8, and 9 are plan views showing the states of each stage of the operation of the swing arm corresponding to FIGS. 1, 5, and 6 of the (first) embodiment described above. The reference numerals in the drawings have the same meanings as in FIGS. 1 to 6, wherein 8a is a connection bar slot, 8b is a connection bolt, 21b is a bracket, 26 is a spring, and 26a and 26b are spring hangers.
[0017]
This second embodiment is different from the first embodiment in that the reversible motor 5, the pulley 9, and the belt 10 are not provided. Instead, the spring 26 is mounted between the hanger 26a, 26b of the spring and the connection. One end of the bar 8 is rotatably attached to the lever 7c and the other end is not to the lever 7b, but to a bracket 21b fixed to the beam 21 of the carriage, and the connection bar 8 is provided with a slot 8a. It is. The connecting bar 8 is rotatably connected to a lever 7c via a connecting bolt 8b and a slot 8a, and the lever 7c is fixed to a pivot 2a of a front portion 1a of a swing arm at a hinge 2. A spring 26 is mounted between hangers 26a and 26b, said hanger 26a being fixed on the front part 10a of the swing arm, and the rear part of the hanger being pressed against the rear part 1b of the swing arm by the force of the spring 26. As a result, the front portion 1a of the swing arm is maintained so as not to bend inward unless another forcing force is applied.
[0018]
Next, the operation of the swing arm 1 shown in FIGS. 7 to 9 will be described. First, in the first stage, as in the first embodiment, as shown in FIG. 8, when the air cylinder C1 is actuated and the lever 7a is pulled, the swing arm 1 pivots around its pivot point 4. Turn at an appropriate angle not exceeding 90 °. Then, the air cylinder C5 is operated to push the (first) upper gripper 6 holding the cut end of the film from above forward, thereby tensioning the film F. Next, the air cylinder C3 is actuated to close the (second) upper gripper and to clamp the upper end under the film, which has been opened halfway, at the intermediate position. In these respects, the second embodiment does not differ from the first embodiment.
[0019]
In the second embodiment, as shown in FIGS. 7 to 9, when the air cylinder C1 pulls the lever 7a and turns the swing arm 1 at an angle not exceeding 90 °, the turning motion causes the bracket 21b to move the swing arm 1 to the bracket 21b. The connecting bar 8 whose one end is rotatably mounted is also pulled. However, since the connecting bar 8 is provided with the slot 8a, the operation of the air cylinder C1 is absorbed by the slot 8a and transmitted to the lever 7c. I can't. On the other hand, the spring 26 maintains the entire swing arm 1 in a straight state as described above. Accordingly, in the first stage, the front portion 1a of the swing arm does not bend inward, and the swing arm 1 opens the cut film F in the state shown in FIG.
[0020]
In the second stage of opening the door, since the connecting bolt 8b of the connecting bar 8 has already reached the end of the slot 8a, the operation of the air cylinder can no longer be absorbed. Therefore, in the second stage, the operation of the air cylinder C2 is directly transmitted to the lever 7a, the connecting bar 8, the lever 7c, and to the pivot 2a of the front part 1a of the swing arm fixed to the lever, When C2 pivots the rear portion 1b of the swing arm outwardly around its pivot point 4 and to the rear of the pivot point, the front portion 1a of the pivot arm simultaneously resists the tensile stress of the spring 26, as shown in FIG. As shown in FIG.
In the device of the present invention, for example, a servomotor that rotates in the forward and reverse directions according to a command from a control system may be used instead of the air cylinders C1 and C2.
[0021]
【The invention's effect】
As described in detail above, according to the present invention, when opening the film by opening and closing the film left and right as described above, the opened film can be reliably caught and removed without touching the packaged object, In addition, it is possible to provide a film package unpacking device that minimizes the space in which other devices generated upstream and downstream of the unpacker cannot be installed.
[Brief description of the drawings]
FIG. 1 is a plan view of an embodiment of the device of the present invention.
FIG. 2 is an enlarged view of a main part of the apparatus of FIG.
FIG. 3 is an enlarged side view of a main part of the apparatus of FIG. 1;
FIG. 4 is a sectional view taken along line XX ′ of FIG. 3;
FIG. 5 is a plan view for explaining the operation of the apparatus of FIG. 1, showing a first stage of opening the film from which the swing arm has been cut.
FIG. 6 is a diagram showing a second stage following FIG. 5;
FIG. 7 is a plan view of an embodiment of the device of the present invention, which is different from FIG.
8 is a plan view for explaining the operation of the apparatus of FIG. 7, and is a view showing a first stage of opening a film from which a swing arm has been cut.
FIG. 9 is a diagram showing a second stage following FIG. 8;
FIG. 10 is a schematic view of a conventional unpacking machine having a swing arm.
[Explanation of symbols]
1: swing arm for opening the film, 1a: front part of the swing arm, 1b: rear part of the swing arm, 2: hinge, 2a: turning axis of the front part of the arm, 3: second upper gripper, 4: arm 5: reversible rotary motor, 6: first upper gripper, 7a, 7b, 7c: lever, 8: connecting rod, 8a: slot of connecting rod 8, 8b: connecting bolt, 9: pulley, 10: belt, 20: rear support, 21: carry, 21a: carry beam, 21b: bracket, 22: holding plate, 23: pusher, 24: focusing ring, 25: discharge nip roller group, 26: Spring, 26a, 26b: hanger of spring, L: film package, F: film, A: cutting device, C1, C2, C3, C4, C5, C6, C7, C8: air seal Nda

Claims (1)

A package in which the objects to be packaged stacked on the pallet are packaged with a film is placed between at least two pillars located on the front and rear sides, and the film covering the front surface of the package is cut vertically. Attach it to the unpacking machine that opens and unpacks the door left and right, clamps the upper edge of the cut portion of the film with the upper gripper at the tip, and roughly supports the fulcrum provided at the left and right symmetrical positions on both sides of the center of the rear side of the package. A pair of swinging arms that pivot left and right outward to the center to open the film, and these swinging arms are separated from the front and rear portions by hinges at positions where the entire length is roughly divided into two. At the position adjacent to the rear of the hinge, a second upper gripper for holding the upper edge of the opened film is attached, and the entire swing arm is extended, and is turned outward at an angle not exceeding 90 °. Means and hinge Swing arm just outside, and said that the provided means to pivot the rear of the fulcrum, wherein the film package unpacking machine part after et.

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