RU155205U1 - CARDBOARD TUBE MACHINE - Google Patents

Abstract

1. A machine for the manufacture of cardboard tubes by winding along a helix of one or more strips of cardboard partially overlapping each other, characterized in that it contains a plurality of molding groups that are supported by one structure (S) and are inclined vertically relative to one another and in horizontal directions, and in that each of said molding groups (1, 2) comprises means for manufacturing a cardboard tube in such a way that the machine can produce a plurality of cardboard tubes simultaneously By the way. 2. A machine according to claim 1, characterized in that it contains two molding groups (1, 2) so that the machine can produce two cardboard tubes simultaneously. The machine according to claim 1, characterized in that each of the mentioned molding groups contains two molding rollers (1a, 1b, 2a, 2b), one of which (1b, 2b) is equipped with a drive, that is, connected to the corresponding engine (1m; 2m ), which controls its rotation at a given angular velocity, and a belt (1s, 2s), wound in such a way that it forms a figure of eight on the said rollers (1a, 1b, 2a, 2b) and the corresponding spindle (1d, 2d) with a horizontal axis, while the rollers of each of the molding groups are placed on opposite sides relative to spindle and rollers (1a, 1b, 2a, 2b) of each of the molding groups (1, 2) are supported on the corresponding metal strip (1e; 2e), which, on the opposite side, provides support for the corresponding motor (1m, 2m), and each of the said planks (1e, 2e) each has a rear protrusion (1f, 2f), by means of which it is attached to the said structure (S). 4. The machine of claim 3, wherein

Description

This utility model relates to a machine for the production of cardboard tubes, in particular for the paper processing industry.

It is known that in the paper processing industry, machines for making cardboard tubes, also called sleeve-winding machines, produce a rigid tube made of cardboard (also called a “sleeve”), onto which paper is wound, forming a roll, or “log”, which, subsequently, divided into a number of elements of a given length to receive rolls of toilet paper, rolls of paper towels, etc.

The aforementioned tube is made of strips of cardboard that are unwound from the respective coils and then wound along a helical path onto a metal spindle having a horizontal axis and glued together to form a self-supporting tubular structure. Generally, two or three strips of cardboard are used, depending on the desired thickness of the manufactured sleeve. You can also make sleeves from one strip of cardboard, while using specialized unwinders. The strips of cardboard partially overlap each other and, by means of a figure-eight belt wound around two guide rollers, they are rotated around the spindle and pushed forward until a tubular cardboard sleeve that moves forward along the same spindle is received. The said belt is also wound around the spindle, engaging with strips of cardboard. Using a special cutting device, a tubular cardboard sleeve is cut to a predetermined length corresponding essentially to the length of the logs produced by other machines, which are commonly called “rewinding machines”.

Conventional machines for the manufacture of cardboard sleeves (or sleeve winding machines), described earlier, have a certain drawback, namely, the inability to increase production over a predetermined amount. This actually entails an excessive increase in the speed of the take-up rollers, which therefore leads to a rupture of the strip of cardboard due to the resulting excess voltage to which the strip is subjected. In other words, increasing the working speed of the molding group and the formation of helical lines on the spindle leads to the fact that the stripes of cardboard are subjected to stress, which gradually increases. When the threshold speed is exceeded, the voltage on the cardboard strips becomes such that it causes a break in these strips between the winding belt of the forming group and the coils from which the cardboard strips are unwound.

Therefore, in order to compensate for the temporary increase in the production of logs, in most paper-processing plants place additional sleeve winding machines; the mentioned sleeve winding machines usually remain unused or are not used at full capacity, which entails obvious economic and organizational disadvantages.

The main objective of this utility model is to eliminate or at least significantly reduce the aforementioned disadvantages.

This result is achieved, according to the present utility model, using a machine having the features specified in paragraph 1 of the utility model formula. Other features of the present utility model are described in the dependent claims of the utility model.

The main advantage of this utility model is the ability to produce more cardboard tubes without increasing the working speed of the winding belt, which, therefore, remains within certain limits to minimize the possibility of damage to cardboard strips. In addition, the machine according to the utility model is relatively easy to manufacture, has labor costs comparable to a conventional sleeve winder, or slightly less than the labor for two conventional sleeve winders, and has a cost that is relatively small in relation to the advantages offered. In addition, working with a machine for the production of cardboard tubes according to this utility model does not require any special training.

These and other advantages and features of the present utility model will become more apparent to any person skilled in the art from the following description and the attached drawings, given as an example of the practical implementation of the utility model, but not of a limiting nature, while in the drawings:

- FIG. 1 is a schematic front view of a cardboard tube manufacturing machine according to a first embodiment of the present utility model, with some parts not shown in order to better illustrate other parts;

- FIG. 2 is a schematic side view of the winding machine of FIG. one;

- FIG. 3 is a schematic view with a spatial separation of the details of the winding machine shown in FIG. 1 and FIG. 2;

- FIG. 4 is a schematic front view of a winding machine according to another embodiment of the present utility model;

- FIG. 5 is a schematic side view of the winding machine of FIG. four;

- FIG. 6 is a schematic plan view in plan of the sleeve winder shown in FIG. 4 and FIG. 5, with some parts not shown to better illustrate other parts.

Given only with respect to its basic structure with reference to the example shown in FIG. 1-3, a machine for manufacturing cardboard tubes, or a sleeve winding machine, according to a utility model, contains two independent molding groups, or units, (1, 2), placed on one supporting structure (S). Each of the mentioned molding units (1, 2) contains: two rollers (1a, 1b; 2a, 2b), one of which (1b, 2b) is equipped with a drive, that is, it is connected to the corresponding motor or gear motor (1m, 2m), which determines their rotation with a given angular velocity; and a belt (1c, 2c) wound in such a way that it forms a figure-eight shape on said rollers (1a, 1b; 2a, 2b) and a corresponding spindle (1d, 2d) having a horizontal axis. The rollers of each molding group are placed on opposite sides relative to the corresponding spindle.

The rollers (1a, 1b; 2a, 2b) of each molding unit (1, 2) are supported on the corresponding metal strip (1e, 2e), which on the opposite side (rear side) provides support for the corresponding gear motor (1m, 2m). Each of the said bars (1e; 2e) has a rear protrusion (1f, 2f), which is attached to the inner vertical wall (S1) of the structure (S).

According to the well-known operating procedure, each of the said belts (1s; 2s) engages with one or more (for example, two) pre-glued cardboard strips (not shown in the drawings), forcing them to wrap around the corresponding spindle (1d; 2d) and move forward along him, forming a tube of screw strips of cardboard, each of which moves forward along the axis of the spindle, at a speed determined by the speed of the rollers (1b; 2b) with the drive. Ahead of each spindle (1d; 2d) is a cutting device (not shown in the drawings) that cuts the cardboard tube in the transverse direction to a predetermined length.

In the example shown in FIG. 1, FIG. 2 and FIG. 3, molding groups (1, 2), vertically and horizontally spaced from each other, are arranged so that the axes (1g, 1h) of the rollers (1a, 1b) of the lower group (1) are parallel to the base (S2) of the structure (S), which is located horizontally, while the axes (2g, 2h) of the rollers (2a, 2b) of the upper group (2) are inclined downward. The angle of inclination of the axes (2g, 2h) of the rollers (2a, 2b) of the upper group (2) is, for example, from 5 ° to 20 ° relative to the horizontal plane. The mentioned angle of inclination is 10 ° in the examples shown in the drawing. The same tilt angles apply to the above-mentioned trims (1e, 2e). In fact, the rear surface (10f) of the protrusion (1f) by which the strip (1e) of the upper molding group (1) is attached to the wall (S1) of the structure (S) is vertical, while the corresponding surface (20f) of the protrusion ( 2f) the upper molding unit (2) is inclined. This embodiment is a possible example of connecting the molding groups (1) and (2) to the structure (S) in such a way as to obtain the expected orientation of the axes of the rollers (1a, 1b) and (2a, 2b).

Since the molding groups (1, 2) are inclined in the structure (S), both horizontally and vertically, and the upper molding unit (2) is inclined as described above, the height (H) and length (L) of the structure (S) are reduced, while allowing the simultaneous manufacture of two tubes (one in the lower group 1 and the other in the upper group 2), and the tube made by one of the groups does not interfere with the components of the other group (in particular, in the examples shown in Fig. 1-3, the cardboard tube manufactured by the lower group 1 does not collide with components of the upper group 2).

In the example shown in FIG. 1-3, the spindles (1d, 2d) of the two molding groups are parallel to each other and oriented according to the length (L) of the structure (S).

In FIG. 4-6 show an additional embodiment of the present utility model. In these drawings, reference numerals have the meanings described above with respect to the first example.

According to the example of FIG. 4, FIG. 5 and FIG. 6, the molding groups (1, 2) are horizontally and vertically spaced from each other and are arranged so that the axes (1g, 1h; 2g, 2h) of the respective rollers (1a, 1b; 2a, 2b) are oriented vertically, i.e. the corresponding slats (1e; 1e) are oriented horizontally. Spindles (1d; 2d) are parallel to each other and are located horizontally. The upper molding unit (2) rests on the horizontal shelf (S3) of the structure (S), while the lower molding unit (1) rests on the lower base (S2) of the same structure (S). In particular, the strips (1e, 2e) are parallel to each other, as shown in FIG. 6, and are oriented diagonally relative to the rear wall (S1) of the structure (S). This provision of molding groups (1, 2) allows to reduce the depth (P) of the structure (S), while making it possible to simultaneously produce two tubes (one in the lower group 1 and the other in the upper group 2), which avoids the collision of the tube, manufactured by one group, with devices of another group.

According to the present utility model, said structure (S) has two independent molding groups (1, 2), and a machine has been implemented capable of producing two cardboard tubes at the same time. Although each of the molding groups (1, 2) operates at a speed lower than the maximum speed that the characteristics of the used strips of cardboard allow (to avoid the disadvantages typical of sleeve winding machines when using them at high speed), the hourly productivity of the machine is generally higher. For example, when using two identical molding groups, if each of the two groups operates at 75% of the rated power, the total hourly output is equal to 150% of the productivity of each group. In addition, the layout of the two molding groups (1, 2) is such that the overall size of the machine is less than the sum of the sizes of two separate conventional machines. As for the symbols used in the drawings according to the examples shown in FIG. 1 and FIG. 2: L = 2b, a <H <2a, c <P <2c; while, according to the examples in FIG. 4, FIG. 5 and FIG. 6: P = c, a <L <2a, H = 2b. In other words, in each of the two illustrated examples, the two machine sizes (H and P in the examples shown in Fig. 1 and Fig. 2; L and P in the example shown in Fig. 4, Fig. 5 and Fig. 6) are smaller than doubled the corresponding sizes of individual molding groups.

In both examples described above, the molding groups (1, 2) are located one relative to the other so that they are vertically and horizontally inclined, and so that the path along which the cardboard tube formed on the spindle of the molding group does not collide with devices or components of another molding group.

A preform can be supplied to the two molding groups mentioned, for example, using a machine having the characteristics disclosed in EP 1545867, the contents of which are referred to for a more detailed description. In practice, the details of the execution may vary in any equivalent manner as regards the individual elements described and illustrated and their layout, without departing from the scope of the decision, and thus remain within the scope of protection of this patent.

Claims (7)

1. A machine for the manufacture of cardboard tubes by winding along a helix of one or more strips of cardboard partially overlapping each other, characterized in that it contains a plurality of molding groups that are supported by one structure (S) and are inclined vertically relative to one another and in horizontal directions, and in that each of said molding groups (1, 2) comprises means for manufacturing a cardboard tube in such a way that the machine can produce a plurality of cardboard tubes simultaneously lightly. 2. The machine according to claim 1, characterized in that it contains two molding groups (1, 2) so that the machine can produce two cardboard tubes at the same time. 3. The machine according to claim 1, characterized in that each of the mentioned molding groups contains two molding rollers (1a, 1b, 2a, 2b), one of which (1b, 2b) is equipped with a drive, that is, connected to the corresponding engine (1m ; 2m), which controls its rotation at a given angular speed, and a belt (1s, 2s), wound in such a way that it forms a figure of eight on the said rollers (1a, 1b, 2a, 2b) and the corresponding spindle (1d, 2d) with a horizontal axis, wherein the rollers of each of the molding groups are placed on opposite sides relative to the spindle and the rollers (1a, 1b, 2a, 2b) of each of the forming groups (1, 2) are supported on the corresponding metal strip (1e; 2e), which, on the opposite side, provides support for the corresponding motor (1m, 2m), and at the same time each of said planks (1e, 2e) has a rear protrusion (1f, 2f) by which it is attached to said structure (S). 4. The machine according to claim 3, characterized in that the said molding groups are the lower molding group (1) and the upper molding group (2), and they are located in such a way that the axis (1g, 1h) of the rollers (1a, 1b) the lower molding group (1) are parallel to the horizontal base (S2) of the structure (S), while the axes (2g, 2h) of the rollers (2a, 2b) of the upper molding group (2) are inclined downward. 5. The machine according to claim 3, characterized in that said molding groups are arranged so that the axes (1g, 1h, 2g, 2h) of said rollers (1a, 1b, 2a, 2b) are vertical. 6. Machine according to one of paragraphs. 1-5, characterized in that the said molding groups are independent of each other. 7. Machine according to one of paragraphs. 1-5, characterized in that two sizes of the machine are smaller than twice the corresponding sizes of the individual molding groups.

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