JPH06211423A - Device for forming z-shaped folding line on strip - Google Patents

Abstract

PURPOSE: To form a Z-shaped fold on a strip made of flexible materials and a strip-shaped cut-off at low facility costs. CONSTITUTION: A device for forming a fold is provided with a pair of rolls 15 and 16 or a double belt conveyer for feeding a strip 1 at a fixed speed. Two pairs of rolls 22 and 23 or a double belt conveyer are positioned after the pair of rolls 15 and 16, and the pair of rolls or the first pair 22 of the double belt conveyer rotate at a low speed, and the second pair 23 rotate at a feeding speed. Upper rolls 24 and 25 are elevated in a fold formation timing, and the first pair of rolls delay a strip while the second pair of rolls do not make any feeding action on the strip, and a loop is formed. After the loop is formed, when one roll 25 of the first pair of rolls is lifted up from the other roll 22', the second pair of rolls start to feed the strip.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for forming Z-shaped folds on a strip or strip-shaped strip of flexible material.

Strips of this kind having Z-shaped folds are used, for example, as handles for bags or bags. The strips are flat folded before use and are pulled up in a loop to form a handle. Adjacent ends of the strip are glued to the bottom or lid portion of the bag or bag.

[0003]

Double belt conveyor having guide rollers for two base strips, a narrow width plastic strip entering between the base strips and feeding the plastic strip intermittently at high speed. By providing Z-shaped folds at even intervals in the plastic strip by forming the folds, the folds are formed with a forming die having a triangular mold hole. Another type of device is known from German Patent No. 3,440,958. The upper base strip is provided with rectangular punched holes, spaced apart, corresponding to the dimensions of the Z-fold, where the fold is located, and the base strip to be merged is glued and pressed between the press rolls. Crimp. Thus, the known device handles strips of three coalescing continuous strips, the upper layer of the strips having rectangular cutouts at even intervals, in which the middle continuous strip Z-shaped. There are folds that can be pulled up into a handle loop. Next, the individual hand-held handles are cut out from the continuous strip and fixed to the carton.

The known device is expensive, because a special double belt conveyor must be provided to form the loop in the intermediate plastic strip. This double-belt conveyor must circulate at a high speed as compared with the feed speed of the base strip at the timing of crease formation.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to provide a device of the type mentioned at the outset, which makes it possible to make Z-folds in continuous strips or strip-shaped cuts with low equipment costs. That is.

[0006]

According to the invention, an apparatus of the kind based on the above concept is provided with a pair of rolls or a double belt conveyor for feeding strips at a constant speed, which is
Behind a set of roll pairs or double belt conveyors, of which the first pair rotates at a low speed, the second pair rotates at a feed rate, and the upper rolls are raised and lowered with respect to each other at the time of crease formation, The first pair of rolls delays the strips to form a loop while the second pair of rolls does not feed the strips, and after formation of the loop, one roll of the first roll pair is the other roll. The second pair of rolls again feeds the strips when they are separated from each other, thereby solving the above problem. Therefore, in the device according to the invention, the strips or strip-shaped cuts are successively advanced on one conveyor, two roll pairs being placed downstream on this conveyor, the first of which being The first pair of rolls can always rotate at a low speed, and the second pair of rolls is driven at a speed corresponding to the approach speed. Then, the two roll pairs sequentially and alternately act in a rhythmic manner, and the fold formation is performed by the first roll pair during deceleration, while the second roll pair is carried out after the formation of the fold and the sharp creases of the two folds are formed. Fold and fold. In this way, in the device of the present invention, all the feeding devices or feeding rolls can always rotate at a constant speed, and therefore, there is no need to provide a feeding device that intermittently conveys at high speed and low speed. good. Control may be performed so that the rolls rotating at different speeds act on the strip or cut piece to be creased at the timing of crease formation.

By means of the device according to the invention, strips or cuts with Z-shaped creases are produced, which are then, for the time being, flat baggage handles in bags, bags or cartons in any manner. Can be installed.

It is preferred that the rolls of the pair of rolls, which are continuously conveyed, comprise folding knives which interact with the grooves of the opposite rolls. Folding knives score lines or cuts at Z-fold spacing. This fold line helps the loops on the strips to be folded in a Z shape during subsequent transport.

A guide plate for folding the fold into a Z-shape is preferably arranged above the entrance area of the first roll pair.

It is preferable to provide a gluing nozzle for applying a spot of glue for adhering the subsequent folds to the cut piece in the conveying path.

In another configuration of the present invention, a horizontal cutting device for cutting strip-shaped cut pieces from the strip-shaped continuous material is placed after the continuous transport device for continuous feeding of the strip-shaped continuous material, and the cut pieces are Z-cut.
The transport of the cut pieces through the creasing device was such that it was between the interacting feed sides of the double belt conveyor. In this configuration, since the double belt conveyor takes charge of the conveyance, it is possible to make a Z-shaped crease on the cut piece.

It is preferable that the feed device for advancing the continuous strip material moves at a lower speed than the double belt conveyor to form a gap between the individual strip-shaped cut pieces.

The detachable rolls of the first and second roll pairs can be mounted between pivotally mounted levers, the pivoting movement of the levers being controlled by a disc or roll with cams. . The lever carrying the roll is a bending lever, one arm of which can be used for bearing and the other arm for control.

It is preferable to dispose two roll pairs and their control units on a carriage that is movable in the feed direction within the machine frame. This makes it possible to adjust the strips for Z-folding to different sizes.

In another structure of the present invention, the upper roll of the first roll pair interacts with the opposing rolls of the divided discs, and a small diameter roller is rotatably mounted on the roll shaft between the discs. The lower conveyor belt of the double belt conveyor, which is supported, passes above the small diameter roller. In this way
In the area of the first roll pair, the conveyor belt is pulled away from the cut piece, so that when the first pair of rolls advances the cut piece at a speed less than the feed rate to form a loop, the conveyor belt forms a cut piece. Does not work friction.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings.

A handle strip 1 consisting of a cut piece is shown in FIG. The Z-shaped fold is fixed at the spot 2 of the glue.

As shown in FIG. 2, the areas at both ends of the handle strip 1 are adhered to the folding bottom 3 of the bag 4. Next, the bottom cover sheet 5 is placed on the folding bottom 3, and the entire surface is bonded to the bottom 3. The bottom cover sheet 5 has a cutout hole 6 in which the Z-shaped fold area of the strip is located, so that the user can pull up the fold line into a loop-shaped handle.

As shown in FIG. 2, the Z-shaped fold of the handle strip 1 makes it possible to form a flat bottom, for example for stacking. The Z-shaped creases project from the bottom at no or negligible extent.

The manufacture of such a handle strip 1 will be described in detail below with reference to FIGS. Two pairs of feed rolls 7 and 8 arranged one behind the other are shown in FIG. A narrow, possibly multiply folded paper tape 9 is fed by these pairs of rolls.
Next, the individual grip strips 1 are cut from the endless tape 9 by the cutting cutter device 10.

After cutting, the strips 1 are attached to the upper and lower guide belts 1.
Reach between 1 and 12. The guide belts 11, 12 feed the individual handle strips 1 through the vicinity of the melt nozzle 13 into a folding cylinder 14. This folding cylinder 14
Consists of two interacting counter-acting drive cylinders 15 and 16. The cylinders 15 and 16 have elastic outer peripheral surfaces. Furthermore, one folding knife 17 and 18 is planted in each of the cylinders 15 and 16. The knives are staggered and each handle strip is provided with two fold lines spaced apart from one another.
In that case, in the direction of passage of the handle strip 1, the first folding line 19
The folding knives 18 and the second folding lines 20 are made by the folding knives 17.

An adjustable feed carriage 21 is mounted behind two cylinders 15 and 16 on which two pairs of rolls 22 and 23 are mounted. The two upper rolls 24 and 25 of each roll pair 22 and 23 are mounted on folding levers 26 and 27 which are pivotable about points 28 and 29.
For this purpose, the long arms of the folding levers 26 and 27 have free-rolling rollers 30 and 31 at their ends. The rollers 30 and 31 elastically contact a rotatable hollow cylinder 32 provided with a cam. With this cam 33 or 34, the roller 30 or 31 can be ejected from the position in contact with the hollow cylinder 32. Therefore, depending on the position of the hollow cylinder 32, the upper roll 24 or the upper roll 25 is connected to the roll pair 22 or 2.
It can be separated from the corresponding roll of No. 3.

In the illustrated embodiment, the upper roll 25 is in contact with the associated lower roll, so that the front area of the handle strip 1 is clamped between the two rolls. This 2
Since the two rolls, that is, the pair of rolls 22, are driven at a feeding speed of the handle strip 1, that is, a speed lower than the peripheral speed of the cylinders 15 and 16, the handle strip 1 is braked at its front end on the one hand. On the other hand, it is pushed by the cylinders 15 and 16 so that the Z-shaped fold shown in FIG. 3 is formed. A guide plate 35 is provided so that the Z-shaped fold line does not shift upward. At the moment when the Z-shaped fold is formed, the hollow cylinder 32 is rotated, the roll 25 is lifted,
The roll 24 is lowered. The roll pair 23 is driven at a peripheral speed equal to that of the cylinders 15 and 16, and as a result,
The handle strip 1 is fed at the same speed over the entire area. At that time, the Z-shaped crease itself is lightly pressed again by the roll pair 22, and the spots 36 of the melt formed by the melt nozzle 13 are formed.
Thus, the shape of the Z-shaped fold is fixed. The strips are then sent by belt 11 to stack 37.

The peripheral speed of the feed roll pairs 7, 8 is lower than the peripheral speed of the guide belts 11 and 12, and therefore the endless strip 9 and the grip strip cut after cutting by the cutting cutter device 10. A space is formed between the two. In this case, the inlet areas 38 of the guide belts 11 and 12 are opposite, slipping over the front area of the handle strip and actuating the handle strip only when a cutting is performed by the cutting cutter device 10.

The Z-shaped folds themselves are cylinders 15 and 16
Since it is driven at a speed lower than the peripheral speed of the guide strip, the guide belt passing through the lower roll 22 'of the roll pair 22 like the handle strip 1 must not be blocked by this roll. As can be seen in FIG. 4, the lower roll 22 'includes two discs 39 and 40 spaced apart from each other.
Consists of. These discs are fixed on the drive shaft 41. A ball bearing 42 is attached to the shaft 41 between the two discs 39 and 40, and the diameter thereof is the disc 39,
It is smaller than the outer diameter of 40. Since the belt 11 is above the ball bearing 42 and is slightly retracted in the gap formed by the two discs 39, 40, the conveyor belt 11 can come into contact with the handle strip 1 in this area. Absent. In this way, the belt 11 is prevented from being tightened when the rolls of the roll pair 22 are driven face to face.

The feed carriage 21 can be moved in the direction indicated by the arrow so that the length of the handle strip 1 can be changed.

[Brief description of drawings]

FIG. 1 is a side view of a cut piece having Z-shaped folds.

2 is a plan view showing a folding bottom of a bag provided with a handle strip of the type shown in FIG. 1;

FIG. 3 is a schematic side view showing an apparatus for making a Z-shaped crease on a cut piece cut from a continuous strip.

FIG. 4 is the first of FIG. 3 with a detachable upper roll.
It is sectional drawing of a roll pair.

[Explanation of symbols]

 1 strip 15 feed roll 16 feed roll 22 first roll pair 22 'lower roll 23 second roll pair 24 upper roll 25 upper roll

Claims (9)

[Claims] 1. A device for forming a Z-shaped fold in a strip (1) of flexible material or a strip-shaped cut piece, wherein a pair of rolls (15, 15) feeding the strip (1) at a constant speed. 16) or a double belt conveyor with two roll pairs (2
2, 23) or a double belt conveyor after which the first pair (22) rotates at a lower speed and the second pair (23) rotates at a feed rate, the upper rolls (24, 25) Are raised and lowered at the timing of crease formation, and the first roll pair (22) delays the strip (1) to form a loop while the second roll pair (23) does not exert a feeding action on the strip. Then
As soon as one roll (25) of the first roll pair (22) is separated from the other roll (22 ') after forming the loop, the second roll pair (23) again takes up the transport of the strip. A device characterized by the above. 2. Rolls of a continuously feeding roll pair (15, 16) are provided with folding knives (17, 18) which interact with the grooves of the mating rolls, said folding knives being attached to the strip (1) in a Z-direction. The device according to claim 1, characterized in that fold lines (19, 20) are provided at intervals of the shape folds. 3. A guide plate (35) for folding a fold into a Z shape.
Device according to claim 1 or 2, characterized in that is arranged above the entrance area of the first pair of rolls (22). 4. Spots (2) of glue for adhering subsequent folds
4. A device according to any one of claims 1 to 3, characterized in that a glue nozzle (13) for applying the cut pieces (1) to the cut pieces (1) is arranged in the conveying path. 5. A transverse cutting device (10) for cutting a strip-shaped cutting piece (1) from a strip-shaped continuous material is placed after a transport device (8, 9) for continuously transporting the strip-shaped continuous material (9). 2. The cutting pieces (1) passing through a Z-creasing device for the cutting pieces (1) are conveyed between the interacting feed means (11, 12) of a double belt conveyor. The device according to any one of 1 to 4. 6. A device (7, 8) for advancing a continuous strip material.
Device according to any one of claims 1 to 5, characterized in that it rotates at a lower speed than the double belt conveyor (11, 12). 7. Detachable rolls (24, 25) of a first and a second roll pair (22, 23) are supported between swivel-bearing levers (26, 27) and are of said levers. 7. Device according to any one of the preceding claims, characterized in that the swiveling movement is controlled by a disc or a roll (32) provided with cams (33, 34). 8. A carriage (21) configured so as to be movable and fixed in a feed direction in a machine frame, provided with two pairs of rolls (22, 23) and a control section thereof. 8. The device according to any one of claims 1 to 7. 9. An upper roll (2) of the first roll pair (22).
5) interacts with opposed rolls (22 ') consisting of split discs (39, 40), between which the small diameter rollers (42) are located on the roll axis (42). Four
1) It is rotatably supported on the double belt conveyor (1
Device according to any one of the preceding claims, characterized in that a lower conveyor belt (11) (1, 12) passes over the small diameter roller (42).