JPH0680110A - Band-shaped body stretching apparatus and packaging apparatus using the same - Google Patents

Abstract

(57) [Summary] [Purpose] A strip is uniformly stretched over the entire width by combining two transverse stretching means. Also,
Thereby, the laterally stretched strips make the package look good, easy and quick. [Structure] The strip (4) is horizontally stretched in a striped pattern by being sandwiched by a pair of concavo-convex rollers (6) and (7) in the first stretching means (B-1), and second Stretching means (B-
In 2), the both ends in the width direction are held by the holding and conveying device (31) and sequentially stretched in a flared shape, so that the width is stretched substantially uniformly over the entire width. The band-like body (4) stretched in the horizontal direction in this way is wrapped with the winding means (C).
To be wrapped around the luggage (30).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt-shaped body stretching apparatus for stretching a belt-shaped body such as a film or a net in at least the width direction, and a packaging apparatus using the same.

[0002]

2. Description of the Related Art A conventional film stretching device for stretching (transversely stretching) a continuously stretched strip-shaped stretchable film in a direction orthogonal to the feeding direction, that is, in the width direction of the film is, for example, an outer peripheral surface. With a pair of concave and convex rollers in which annular concave stripes and convex stripes are alternately arranged, the film is sandwiched so that the convex stripes of the other roller mesh with the concave stripes of one roller through the film, A structure in which both rollers are rotated in the film feeding direction (for example, Japanese Patent Publication No. 46-11599).
(See Japanese Laid-Open Patent Publication No. JP-A-2003-115), or both side edges of the film are grasped by appropriate grasping means so that both side edges spread apart in the film feeding direction (for example, British Patent No. 849436).
No.)) etc.

A packaging device using the former stretching device
(See, for example, Japanese Patent Publication No. 3-501963), a packaging device using the latter stretching device (see, for example, Japanese Patent Application No. 2-135242).

[0004]

In the case of using the above-mentioned concavo-convex roller, stretched portions and unstretched portions alternately appear in a striped pattern in the direction orthogonal to the film feeding direction, and uniform transverse stretching is performed. However, there are problems that the stretching ratio cannot be increased (about 1.5 times), and the film must be widened after passing between the rollers. In the above-mentioned one in which both side edges of the film are gripped and widened, only both side portions of the film are stretched, and an unstretched portion or a low stretched portion remains in the central portion, so that uniform transverse stretching cannot be performed. There is a point.

An object of the present invention is to provide a belt-shaped body stretching device which can laterally stretch a belt-shaped body uniformly over the entire width by combining two lateral stretching means. It is another object of the present invention to provide a packaging device that can be packaged with a good appearance by using the stretching device.

[0006]

In order to achieve the above object, the strip stretching apparatus of the present invention is provided with an annular groove formed on one of the outer peripheral surfaces of one side of the strip conveying line and the other side. At least one pair of concavo-convex rollers, in which the annular ridges formed on the outer peripheral surface of the concave-convex rollers mesh with each other by rushing through the belt-shaped body, are provided, and at least one of the concavo-convex rollers is rotated by the rotating means. A first stretching means for rotating, and a second stretching means for stretching the strip in the width direction, having a pair of sandwiching and conveying devices for sandwiching both widthwise edges of the strip and transporting the strips toward the end. And is characterized in that the strip is stretched in two stages. Also,
A packaging device of the present invention is characterized by including the above-mentioned band-shaped body stretching device and a winding means for winding the band-shaped body stretched by the stretching device around a luggage.

[0007]

In the first stretching means, the strip is horizontally stretched in a striped pattern by being sandwiched by a pair of concavo-convex rollers, and in the second stretching means, both ends in the width direction are squeezed by the sandwiching and conveying device. By being sandwiched and stretched in a gradually expanding manner, it is stretched laterally almost uniformly over the entire width. The band-shaped body laterally stretched in this way is
It is wrapped around the luggage by the wrapping means.

[0008]

1 to 4 show an embodiment in which the present invention is applied to a packaging device for luggage.

The packaging device (A) comprises a stretching device (B) and a winding means.
(C) and the stretching device (B) is a first stretching means (B
-1) and the second stretching means (B-2). (1) is a horizontal base in the packaging device (A), and (2) is also a top plate.

A biaxially stretchable film (4), which is a belt-like body, is formed in the middle of a vertical original shaft (3) having upper and lower ends pivotally supported by a top plate (2) and a base (1). ) Is continuously wound, and the original roll (4a) is rotatably supported.

The film (4) is made of a polymer such as linear low density polyethylene (LLDPE), low density polyethylene (LDPE), ethylene-vinyl acetate copolymer (EVA), polybutadiene, polyvinyl chloride or polyvinylidene chloride. It is possible to use some of these polymers blended, polymerized in multiple layers, blended with liquid rubber such as polybutene, pressure sensitive adhesive such as petroleum resin, or surface-coated. In place of the film (4), a net-shaped or other band-shaped body may be used.

The film (4) is in front of the original roll (4a).
(1 to the right in Fig. 1)
It is sandwiched by a pair of feed rollers (5) and continuously fed forward along the transport line (L) at a constant speed.

On both sides of the transfer line (L) of the film (4) between the base (1) and the top plate (2), annular concave lines (6a) (7a) and convex lines (7a) are formed on the outer peripheral surface. A pair of vertical concavo-convex rollers (6) and (7) in which 6b) and (7b) are alternately arranged in the vertical direction are arranged, and the concave stripes (6a) (7a) of the respective concavo-convex rollers (6) (7) are arranged. ), The ridges (7b) and (6b) of the other concavo-convex rollers (7) and (6) are fitted via the film (4).

Both the concavo-convex rollers (6) and (7) are inside the base (1).
A motor (not shown) or the like provided on (or inside the top plate (2)) can be rotated synchronously in mutually opposite directions as indicated by arrows shown in FIG. The uneven roller (6)
Only one of (7) may be rotated by a rotating means such as a motor and the other may be allowed to idle. The peripheral speeds of the concave-convex rollers (6) and (7) should be almost the same as the feed speed of the film (4) on the transport line (L), but if they are set slightly higher than the feed speed of the film (4). , Not only the film (4) is stretched in the width direction,
Between the (5) and the concavo-convex rollers (6) (7), the film
(4) can be pulled in the feeding direction and longitudinally stretched.

A first stretching means (B-1) is formed by both the concave-convex rollers (6) and (7) and the rotating means. As shown in FIG. 4, by the first stretching means (B-1), the film (4) is
When passing between the concave-convex rollers (6) and (7), the concave grooves facing each other
Only the part sandwiched between (6a) (7a) and the concave strips (7b) (6b) is laterally stretched, and when it is sent out from the first stretching means (B-1), it is stretched. The striped portion and the unstretched portion have a striped pattern.

The second stretching means (B-2) is the first stretching means (B-1).
A pair of holding and conveying devices (31) for holding the both edges of the film (4) in the width direction and conveying the film (4) toward the end, and the portion stretched by the first stretching means (B-1). The film (4) in which the unstretched portion and the unstretched portion have a striped pattern is stretched in the width direction and stretched in the transverse direction substantially uniformly.

The holding and conveying device (31) includes a base (1) and a top plate.
The central shaft (34a) is pivotally supported by the frame body (32) disposed between the frame body (32) and the pair of upper and lower bearings (33) provided on the frame body (32). A pair of upper and lower discs (34) supported in an inclined state that spreads upward and downward toward each other, and on the outer peripheral surface of a half circumference from the narrowest rear part to the widest front part of each disc (34). , The drive pulley so that the upper and lower edges of the film (4) are crimped to each other so that a part of the disk (34) is wound around and the other part is separated from the disk (34) and can run endlessly. (36) and a pair of upper and lower belts (35) wound around the driven pulley (37).

The upper and lower drive pulleys (36) are driven by a motor (38) installed on the base (1) to drive the pulley (39), the belt (40), the pulley (41) and the horizontal rotary shaft (42). ), Bevel gears (43)
(44), the vertical rotation shaft (45), the bevel gears (46), (47) and the like, via a transmission mechanism (48), they can be rotated at a constant speed in synchronization with each other.

(49) is a guide roller for guiding the film (4) fed from the first stretching means (B-1) to the second stretching means (B-2), and (50) is the film (4) When the upper and lower edges of the film (4) are sandwiched by the upper and lower discs (34) and the belt (35), and the disc (34) and the like are made to rotate about half, the central portion of the film (4) is In order to prevent contraction toward the center, a plurality of vertical guide rollers are arranged along the peripheral edge of the disc (34) in an arc shape in plan view, and both ends thereof are between the upper and lower discs (34). It is pivotally supported by a pair of upper and lower fixed support plates (51) arranged in the.

Between the base (1) and the top plate (2) in front of both discs (34), there is one feed roller (52) and a plurality of guide rollers (53) (54) (55). And one tension roller (5
6) and the feed roller (52) is
7), belt (58), pulley (59), reduction mechanism (60), pulley (6
1), transmission mechanism (64) consisting of belt (62), pulley (63), etc.
It is linked to the motor (38) via the and is rotated in synchronization with the drive pulley (36) for driving the belt (35).

The winding means (C) mounts the luggage (30) on a movable base (66) which is provided so as to be movable back and forth along a rail (65) extending forward from the base (1). The second stretching means (B-
2) Fix the tip of the film (4) sent out from 2) to a part of the luggage (30) and rotate the turntable (67) by a motor (not shown) built in the movable base (66). Allows the fill (4) to be wrapped around the luggage (30).

In this embodiment, the first stretching means (B-1)
Thus, the film (4) in which the stretched portion and the unstretched portion have a striped pattern is fed to the second stretching means (B-2),
There, between the upper and lower discs (34) and the belt (35),
By holding the upper and lower edges of the film (4) and rotating the belt (35) and the disk (34) around the shaft (34a), the film (4) is formed in the width direction, that is, the embodiment. Then, it is pulled vertically.

Therefore, the film (4) delivered from the second stretching means (B-2) is transversely stretched substantially uniformly over the entire width.

The film (4) uniformly stretched in the horizontal direction in this way is sent out from the second stretching means (B-2), and then the tip end thereof is placed on the luggage (30) on the turntable (67). It is fastened and then wound around the luggage (30) by rotating the turntable (67). After winding the film (4), the film (4) is cut by an appropriate cutter (not shown), and the separated terminal is adhered around the luggage (30) to complete the packaging work.

In this embodiment, the film (4)
However, after being separated from the upper and lower discs (34), it can be longitudinally stretched even when passing through the feed roller (52) and the guide rollers (53) (54) (55), and the first stretching means (B -1) the portion where the film (4) enters between the concave and convex rollers (6) and (7), and the portion where the film (4) circulates around the disk (34) in the second stretching means (B-2). You may provide the heating means (not shown) which heats etc.

[0026]

According to the strip stretching apparatus of the present invention, the first
By stretching the strip in two stages by combining the stretching means and the second stretching means, it is possible to carry out uniform transverse stretching with a large stretching ratio and a wide width, which cannot be obtained by the conventional apparatus. . That is, by the first stretching means, a strip-shaped body in which stretched portions and unstretched portions are alternately formed in a striped pattern, by the second stretching means, by sandwiching both end edges of the strip-shaped body and pulling in the width direction, Finally, the strip can be laterally stretched almost uniformly over the entire width. According to the packaging apparatus of the present invention, by combining the above-described belt-shaped body stretching apparatus and the winding means, the package can be packaged in a good-looking manner, simply and quickly.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view taken along the line XX of FIG.

FIG. 3 is a perspective view of a first stretching means.

FIG. 4 is a cross-sectional view taken along the line YY of FIG.

[Explanation of symbols] (1) Base (2) Top plate (3) Original shaft (4) Film (strip) (4a) Original roller (5) Feed roller (6) (7) Uneven roller (6a) ( 7a) Recess (6b) (7b) Relief (30) Luggage (31) Holding and transporting device (32) Frame (33) Bearing (34) Disc (34a) Shaft (35) Belt (36) Drive pulley (37) ) Driven pulley (38) Motor (39) Pulley (40) Belt (41) Pulley (42) Horizontal rotary shaft (43) (44) (46) (47) Bevel gear (45) Vertical rotary shaft (48) Transmission mechanism (49) (50) Guide roller (51) Fixed support plate (52) Feed roller (53) (54) (55) Guide roller (56) Tension roller (57) (59) (61) (63) Pulley (58) ) (62) Belt (60) Reduction mechanism (64) Transmission mechanism (65) Rail (66) Movable base (67) Turntable (A) Packaging device (B) Stretching device (B-1) First stretching means (B) -2) Second stretching means (C) Winding means (L) Conveying line

Claims (2)

[Claims] 1. A ring-shaped ridge formed on one of the outer peripheral surfaces and an annular ridge formed on the other outer-surface of the belt-shaped body project on both sides of the belt-shaped carrier line through the belt-shaped body. At least one pair of concavo-convex rollers arranged so as to mesh with each other, and at least one of the concavo-convex rollers is rotated by a rotating means, and both widthwise end edges of the band-shaped body are clamped. And a second stretching means for stretching the strip in the width direction thereof, the strip stretching device having a pair of sandwiching and conveying devices for stretching the strip in the end direction. . 2. A packaging apparatus comprising: the belt-shaped body stretching apparatus according to claim 1; and a winding means for winding the belt-shaped body stretched by the stretching apparatus around a luggage.