ES1065096U - Precorte device (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Pre-cutting device of the type used to make a pre-cut line in the strip used for fixing garbage bags served in roll characterized essentially by being constituted by a punch (1) with counter-stroke (2), driven by a pneumatic piston (3) acting in conjunction with a pair of plungers (4), and a movable roller (5) along a guide (6). (Machine-translation by Google Translate, not legally binding)

Description

Precut device.

Technical field

The present invention relates to a precut device of the type used to make a line of pre-cut in the belt used for fixing bags Garbage served in roll.

Background of the invention

A common way to serve garbage bags It is in rolls of several units, which are fixed for distribution by means of a strip of plastic or paper, on which, traditionally print advertising motifs as well as texts concerning the product, manufacturer, etc.

To facilitate the detachment of this belt and releasing the bags is feasible the realization of a line of precut or tear, through which the girdle is sectioned transversely and withdrawn without problems. In the opposite case, the Removing this belt is quite laborious, since it settles with a significant degree of tension on the roll of bags, being difficult to insert your fingers under it to start your fracture and even more, achieve directionality and continuity until its detachment, the most common being that said strip be removed to small pieces

This pre-cut line must be carried out during the application process of the belt, which is served in a coil of which are unwound sections that after being sectioned by a shear, they are rolled on the roll of bags fixed by gumming its ends. So said pre-cut must be done at registration, at a specific point in the stretch of unwound strip and before being applied to the roll of bags

The conventional way to effect this Precut is based on the use of two rotating rollers tangents, one of which incorporates one or more blades in radial position, which cut lines in the band of material when it advances between them thanks to its movement rotary. However, this technology presents serious problems of execution. First, it is very complex to change the registry cutting, as this is a direct function of the perimeter of said rollers, so it is necessary to replace them to the change of girdle measurement, and modify synchronization of blades and shears to vary their position along the belt.

Second, the displacement of rollers as well as the pre-cut action of the belt require a a very high driving power.

These conditions make incorporation of a pre-cut line in the rolls of garbage bags be excessively expensive, so its economic impact on the product raises its price to a point that does not justify its advantages of use.

Description of the invention

Generally speaking, the present invention will be refers to a precut device based on the performance of a die that works synchronously with the shear that cuts the coil of strip material, leading to the precut of the band at the same time that the shear makes the section cut that, after being glued, it will be rolled over the roll of bags to form the fastening belt.

This configuration solves the problems mentioned above, since the length of the band that set the belt does not affect the time of cutting the die, and the Once, the position or registration of the precut line in the belt is easily modifiable

On the other hand, the driving power needed to moving the die is minimal, given its light weight and the shortness of the tours made.

Specifically, the new precut device It is made up of a die with counter-die, driven by a pneumatic piston that acts in conjunction with a pair of treadmills, and a roller movable along a guide preferably vertical.

The die is configured by a base preferably of wood, in which they are inserted a plurality of blades whose attack zone is set to so that said cut is made progressively. These blades are grouped in two parallel rows, in each of the which are positioned simultaneously in transverse orientation.

The new precut device is part of the belt positioning mechanism of a bag packaging line of garbage in roll, and its operation is simple: the band of paper from the coil passes through the new device through between the die and the counter die and continue towards the roller movable, from where it finally goes to the shear of band cut. The work rate of the system is marked by the band cutting shear (which is not part of the precut device claimed), so that when the belt feed stops to make a shear cut at In order to separate a new stretch of belt, the treadmills located each other the entrance of the die and another at the exit, descend and imprison the paper band against the counter; immediately, descend the die punching the band, and rising again next to the traders being thus released the band, in which it has already practiced a precut line according to the blade design of the die At this time the line starts up again and advances a section corresponding to the length of the belt necessary to the packaging of roll garbage bags, to stop again and start the same cycle.

The position or registration of the precut line in the section of belt is established by the position of the roller scrollable Given that the die situation of precut and shear in the packaging line are fixed, the position of the movable roller allows to lengthen or shorten the trajectory of the band between the two points, and thus modify the distance between the cutting line and the precut line.

Description of the drawings

In order to illustrate how much so far we have exposed, is accompanied by the present specification of a sheet of drawings on which it has been represented so simplified and schematic an embodiment only illustrative and not limiting the practical possibilities of the invention.

In said drawings, Figure 1 represents a Overall view of the new precut device, and Figure 2 an outline of part of a bag roll packaging line of garbage, in which the new device is integrated.

Finally, figure 3 represents a view Detailed die and counter.

Example Description

Specifically, the new precut device It consists of a die (1) with counter-punch (2), driven by a pneumatic piston (3) acting in conjunction with a pair of treadmills (4), and a movable roller (5) along a guide vertical (6).

The die (1) is configured by a base of wood (7), in which a plurality of blades (8) whose area of attack is shaped like a tip (9), of so that the cut starts at its center and extends to its sides as the die descends on the counter. These blades are grouped in two parallel rows (10), in each of which are positioned at the same time in transverse orientation.

The operation of the device is the next: the paper strip (11) coming from the reel (12) crosses the device between the die (1) and the counterlock (2) and continue towards the movable roller (5), from where he finally goes to the band cutting shear (13).

When the advance of the band (11) stops to make a shear cut (13), the treadmills (4) located one at the entrance of the die (1) and another at the exit, descend and imprison the paper band (11) against the counter-punch (2); act then, the die (1) descends piercing the band (11), and rising again next to the traders (4) thus being released the band.

The position of the pre-cut line in the section of belt is established by the position of the movable roller (5), given that the situation of the precut die (1) and the shear (13) in the packaging line are fixed, so the position of the movable roller (5) lengthen or shorten the trajectory of the band between the two points, and thus modify the distance between the cutting line and precut line.

Claims (3)

1. Device precut the type used to make a line of weakness in the belt used for fastening garbage bags total roll essentially characterized by being formed by a die (1) with counter -die (2), driven by a pneumatic piston (3) acting in conjunction with a pair of treadmills (4), and a movable roller (5) along a guide (6). 2. Pre-cutting device according to the preceding claim, characterized in that the die (1) is configured by a base preferably of wood (7), in which a plurality of blades (8) whose attack zone (9) is established are inserted so that said cut is made progressively so that the cut starts at its center and extends to its sides or starts at the side and continues to the opposite. 3. Pre-cut device according to previous claims, characterized in that the position of the pre-cut line in the belt is established by moving the movable roller (5) along the guide (6).