JPS6112803B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sleeve-type overwrapping device suitable for tightly wrapping a film around a plurality of accumulated postal envelopes or the like.

Prior Art This type of overwrapping device advances an item to be wrapped while pressing it against a vertically stretched film-like packaging material, and wraps the film in a band-like (sleeve-like) manner around the item. An example of such an overwrapping device is the one shown in Japanese Patent Laid-Open No. 47-21291.

However, conventional overwrapping devices, including the device described in the above-mentioned publication, are intended for items that are relatively stable when stacked, such as newspapers, and are difficult to dislodge. It is not suitable for stacked packaging such as stacked envelopes, which are unstable and easily fall apart, or for stacked items that have different heights. In other words, mail envelopes have different thicknesses and are medium-thick with a bulge in the center, so when stacked, not only do the heights of the stacks themselves vary, but they also tend to fall apart.
Conventional equipment has had the problem of making automatic packaging difficult.

Purpose of the Invention The problem to be solved by the present invention is to provide a guide plate for guiding the articles, detect the height of the accumulated articles, and a detection mechanism capable of pressing the upper part of the articles. By providing a presser plate whose height can be adjusted according to the height of the bag, it is possible to collect and package items that have different heights and are easily dislodged.

Structure of the Invention The overwrapping device according to the present invention includes an article lifting mechanism for raising articles stacked on a placing plate, and guide plates provided on both sides of the placing plate for guiding the articles. , an item height detection mechanism that is provided above the item lifting mechanism and detects the height of the items stacked on the mounting plate; a holding plate whose position can be adjusted to prevent the item from floating; a film feeding mechanism which supplies the film to one side of the lifted position of the item; and a film feeding mechanism provided on the other side of the lifted position of the item. an extrusion mechanism that pushes out the items stacked on the placing plate all at once to the one side and wraps the film from three sides of the item, and clamps and welds the film wrapped around the item; and a welding cutting mechanism for cutting, and the height detection mechanism includes:
A detection rod that is movable up and down and comes into contact with the item on the mounting plate, a ring section provided on the detection rod, and a ring part that can swing between a position approaching and a position away from the detection rod. The holding plate has an arm in which a plurality of detection pins are vertically aligned and are pushed out by contacting the ring. A stopper pawl is connected thereto for stopping the lowering of the presser plate.

In the above configuration, when an item is stacked on the mounting plate, the detection rod of the height detection mechanism is lowered to detect the height, and then the arm moves to the height of one of the multiple detection pins provided on the arm. The one that fits hits the ring and is pressed. Next, the presser plate descends and its stopper claw hits the detection pin, stopping the presser plate from lowering. After that, the article is pushed upward by the article lifting mechanism while being pushed by the detection rod, and then the article is pushed by the extrusion mechanism in a direction substantially perpendicular to the stretching direction of the film fed by the film supply mechanism and packaged. The film is welded and cut by the welding and cutting mechanism.

Embodiment An embodiment of the overwrapping device according to the present invention will be described below with reference to the drawings.

The overwrapping device 1 according to this embodiment includes a lifting mechanism 2 that raises stacked items to a wrapping position, a height detection mechanism 3 that detects the stacking height of the stacked items, and a height detection mechanism that detects the stacking height of the stacked items. a lifting prevention mechanism 4 that adjusts the position of a presser plate according to the height of the lifted item to prevent the item from floating; a pushing mechanism 5 that pushes out the entire lifted item laterally; and an pushing side of the item. , a film supply mechanism 6 that supplies the film to the side, and a welding/cutting mechanism 7 that welds the film after wrapping and separates the wrapped film from the unwrapped film, and these are located at the positions shown in FIG. placed in relationship.

The lifting mechanism 2 includes a placing plate 20 which is designed to place items one on top of the other and has a groove 21 formed on the top surface extending in the pushing direction of the items, and a placing plate 20 that moves the placing plate 20 up and down, thereby lifting the items. It has a cylinder 22 that raises the item M to a predetermined position, and a guide plate 23 that surrounds the item M, and when the item M is piled up by a predetermined amount on the mounting plate 20, the cylinder operates and lifts the entire item. is raised to position A.

In Figures 1 to 4, the height detection mechanism 3
has a detection rod 31 which is supported in a vertically movable manner on a frame 30 above the lifting mechanism and has a contact plate 310 attached to its lower end so as to be able to come into contact with the uppermost item. This detection rod 31 is adapted to be moved up and down by a cylinder 32, and a ring 311 is fixed to the center portion.

The height detection mechanism 3 further has an arm 34 that can swing around an upright shaft 33 close to the detection rod, and a plurality of holes 340 are formed at equal intervals vertically on the side surface of the end of the arm 34. It is formed. each hole 3
A detection pin 35 is movably inserted into 40,
An annular groove 350 is formed in the detection pin 35. When this detection pin is pushed into the arm, the ball 36 is pressed by a spring 37.
By engaging with the groove 350, the retracted position is maintained, and the rear end protrudes from the other side of the arm.

In FIGS. 1 and 4, the holding mechanism 4 is fixed to a slider 40 that is vertically movably supported by a pair of upright shafts 11 of the book wrapping device, and is arranged substantially horizontally on both sides of the slider 40 on the opposite side of the slider 40. a pair of frames 41 and 42, which are fixed to the front lower surface of the frame 41 side by side through legs 43, and a pair of presser plates 44 which are fixed to the front lower surface of the frame 42 through a pair of legs 45. It also has one presser plate 46. The holding plates 44 and 46 are at approximately the same height, and the holding plate 44 is higher than the placing plate 2.
The presser plate is positioned directly above the base plate 10 and is pushed out onto the base plate 10 so as to prevent the items stacked on the mounting plate from floating up. It is designed to prevent floating items from floating.

The slider 40 is moved up and down by a cylinder 47, and the presser plates 44 and 46 are also moved up and down thereby.

A stopper claw 48 that can be engaged with the detection pin 35 of the height detection mechanism 3 is fixed to the upper part of the frame 41.

The presser mechanism 4 is connected to the arm 3 of the height detection mechanism 3.
4 rotates around the shaft 33 in the direction of arrow U and faces C.
The height of the item M is detected in the direction of (FIG. 4), and as a result, one of the many detection pins 35 is retracted and the rear end of the detection pin protrudes from the rear surface of the arm, and then the slider, When the frame and presser plate are pushed downward by the cylinder 47, the stopper claw 4
8 engages with the rear end of the detection pin 35, and the slider, frame, presser plate, etc. are stopped at that position.

The extrusion mechanism 5 includes a slider 50 movably supported by a pair of guide rods 12 arranged substantially horizontally, and a slider 50 vertically spaced apart from the tip of the slider.
It has a pair of extrusion plates 51 that are integrally fixed. The lower end of the push-out plate 51 is inserted into the groove 21 formed on the upper surface of the mounting plate 20 to prevent the item from being wedged.

The slider 50 is moved by arrow V by a known cylinder or the like.
It is designed to move back and forth in the direction of the arrow V, thereby pushing out the lifted item on the placement plate in the direction of the arrow V.

In FIG. 1, the film supply mechanism 6 transports the packaging film f pulled out from the upper and lower film rolls Rf to a position close to the guide plate 23 on the base plate side of the lifting mechanism 2 (the guide plate 23 and the base It is comprised of a guide roller 61 that guides the film between the film and the film 10, and a brake device 62 that is provided in the film transport path. The brake device 62 is a brake plate 63
and a brake shoe 65 which is rotatable around a pin 64 and whose tip is pressed against the brake plate, and the brake shoe 65 and the brake plate cooperate to move the film in the feeding direction. It is of a known structure that is adapted to prevent free movement to.

In FIG. 1, the welding and cutting mechanism 7 includes a pair of levers 70 that are swingably disposed on both sides of a base plate 10 about a shaft 71, and a presser member 72 that is attached across the tip of the lever 70. It has a heater 73 disposed between the base plate 10 and the guide plate 23. An elastic plate 74 is provided on the lower surface of the holding member 72.
is fixed. The heater 73 has a known structure in which a heating wire is provided and extends over the entire width of the film, and a wire 75 is attached thereon over the entire width of the film. The heater and wire are positioned so that the top surface of the wire is approximately at the same height as the top surface of the base plate.

In this welding and cutting mechanism 7, the lever 70 is
(Fig. 1) to sandwich the film between the plate 74 of the holding plate member and the wire 75, thereby welding the film f over a certain width and cutting it at the center of the welding member. It's becoming like that.

The overwrapping device having the above structure is initially in a state as shown in FIG. 1. That is, the mounting plate 20 of the lifting mechanism is lowered, and the pushing plate 5 of the pushing mechanism is lowered.
1 retreats to the left (in Fig. 1) and detects the detection rod 3.
1 is gently pressed downward by the fluid pressure cylinder 32, and the holding plates 44, 46 of the holding mechanism are lifted upward by the cylinder 47. Further, the arm 34 of the detection mechanism is connected to the vertical axis 3 as shown in FIG.
3, and is brought into contact with a stopper 39. Therefore, all of the detection pins 35 are projected to the opposite side of the stopper and are in a reset state. Further, the film f is stretched straight between the guide rollers 61.

Next, when an arbitrary number of items are placed on the mounting plate 20 and the mounting plate 20 is raised to the same height as the base plate 10 (position A) by the cylinder 22, the detection rod 31, which is gently pressed downward, The contact plate 310 comes into contact with the envelope and is pushed up to a height corresponding to the thickness of the envelope, thereby being pushed up as a whole. Therefore, as shown in FIG. 4, the shaft 33 rotates in the direction of the arrow U (in FIG. 3) according to a predetermined program, and the group of detection pins is fixed to the ring 311 fixed to the detection rod 31. bring it into contact with. Among the many detection pins 35, only the detection pin 35 that is in contact with the ring 311 is projected to the back side of the arm 34. Therefore, the height position of the contact plate 310 is detected relative to the position of the pin 35.

Next, the slider 4 is moved by the fluid pressure cylinder 47.
0 is pressed downward with an appropriate force, and the stopper pawl 48 also descends. However, the third
As shown in the figure and FIG. 4, the rear end of the detection pin 35 is
Since the stopper pawl 48 is projected during its descent, the stopper pawl comes into contact with the detection pin 35 and is prevented from descending. Therefore, the presser plate 44,
46 also stops descending and is stopped at a predetermined height. After all, by such an action, the presser plates 44 and 46 are set at a height corresponding to the height of the contact plate 310. Therefore, the presser plate 44 for stably guiding the product toward the packaging base plate 10 and the presser plate 46 for tightly wrapping the film around the product are arranged according to the height or thickness of the product. is set.

The pusher plate 51 is then advanced in the direction of arrow V to move the entire item on the mounting plate 20 onto the base plate 10.
At that time, film f should be opened from three sides (top,
(Bottom, right side) will be wrapped. At this time, since the brake shoe 64 is spaced apart from the film, the required amount of film is smoothly supplied.

Next, when the push-out plate 51 retreats, the lever 70 rotates in the direction of the arrow
2 lowers the upper portion of the film as shown in solid lines in FIG.
f' and the lower part f'' of the film are made to approach each other (at this time, both parts f' and f'' are not in contact with each other yet). Therefore, the brake device 62 is actuated to restrict the film supply, and the holding member 72 is lowered to move the upper and lower portions f' of the film between the heater 73 and the film.
f''. Therefore, the item is appropriately tightened by the film, the film is thermally bonded, and the wire 75, which has been appropriately heated by the heater 73, is attached to the holding member 7 as shown in FIG.
It enters the elastic plate 74 of No. 2 and thermally cuts the film f at approximately the center of the bonded portion. This completes the overwrapping of the item M, and since the remaining film is also adhered at the same time, the wrapping can be repeated.

Effects According to the present invention, the following effects can be achieved.

Since the items are stacked on the mounting plate between the guide plates, it is possible to prevent the items from shifting or falling over.

The height detection mechanism detects the height of each product packaging unit and adjusts the height of the presser plate, making it suitable for integrated packaging of products of varying heights.

When the article lifting mechanism lifts the article from between the guide plates, the detection rod of the height detecting mechanism presses the top of the accumulated articles while lifting, so that the articles do not fall.

Since the stacked items are pushed out laterally while the top is held down by the presser plate, the items can be pushed out completely.

Therefore, it is possible to automatically collect and package even items whose heights differ each time and which tend to collapse.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view of an embodiment of the overwrapping device according to the present invention, FIG. 2 is a perspective view showing a part of the overwrapping device of FIG. 1, and FIG. 3 is a part of the height detection mechanism. FIG. 4 is a diagram similar to FIG. 3 but showing a different operation mode, FIG. 5 is a plan view showing a part of the height detection mechanism in cross section, and FIG. 6 is a wrapping operation. FIG. 7 is a diagram showing the overwrapping device inside, and FIG. 7 is a diagram showing the welding state of the film. 1: Top wrapping device, 2: Lifting mechanism, 20: Placement plate, 22: Cylinder, 3: Height detection mechanism, 31:
Detection rod, 310: Contact plate, 34: Arm, 35:
Detection pin, 4: Presser mechanism, 40: Slider, 4
4, 46: Holding plate, 5: Extrusion mechanism, 6: Film supply mechanism, 7: Welding and cutting mechanism.

Claims (1)

[Claims] 1. An item lifting mechanism that lifts items stacked on a placing plate, guide plates provided on both sides of the placing plate to guide the items, and an item lifting mechanism provided above the item lifting mechanism. and an item height detection mechanism for detecting the height of the items stacked on the mounting plate, and a position adjustable according to the height of the item detected by the height detection mechanism; a film feeding mechanism that supplies the film to one side of the lifted position of the item; The present invention includes an extrusion mechanism that extrudes the wrapped items together to the one side and wraps the film from three sides of the item, and a welding and cutting mechanism that clamps, welds, and cuts the film wrapped around the item, and The height detection mechanism includes a detection rod that is movable up and down and comes into contact with the item on the mounting plate, a ring portion provided on the detection rod, and a position close to and a position away from the detection rod. The holding plate has an arm in which a plurality of detection pins that are able to swing between the rings and are pushed out when they come into contact with the ring are arranged in the vertical direction, and the holding plate has an arm that is able to swing between An overwrapping device characterized in that a stopper claw is connected to stop the operation and thereby stop the lowering of the presser plate.