CN111056345A

CN111056345A - Unwinding mechanism for rolled webs

Info

Publication number: CN111056345A
Application number: CN201911245992.3A
Authority: CN
Inventors: 郑国升; 杨积元; 罗兆波; 戴加良
Original assignee: Foshan Baosuo Machinery Manufacturing Co Ltd
Current assignee: Foshan Baosuo Machinery Manufacturing Co Ltd
Priority date: 2019-12-07
Filing date: 2019-12-07
Publication date: 2020-04-24

Abstract

The unwinding mechanism of the reel-like web comprises a first circulating element for driving the reel to rotate at the first unwinding position, and a reel displacement mechanism for driving the reel to move from the first unwinding position to the second unwinding position, in A second circulating element that keeps the reel rotating during the movement of the reel, and a second moving mechanism that drives the second circulating element to follow the movement of the reel. The advantages of the present invention are that there is no need to set up a standby position specially for placing a new reel, and there is no need to rely on the stretching deformation of the circulating element to maintain the rotation of the reel during the movement of the reel, which simplifies the mechanism and improves the efficiency of the circulating element. Durability, reducing the space occupied by the mechanism and improving work efficiency.

Description

Unwinding mechanism for web material in roll form

Technical Field

The present invention relates to a mechanism for unwinding a web wound in a roll from a roll.

Background

In the production of toilet paper rolls, folded tissues, rolls of non-woven fabric and other products, it is often necessary to unwind a web of paper, non-woven fabric, or the like wound in a roll from the roll by an unwinding mechanism in order to further process the web.

During the operation of the unwinding mechanism, there is a process of taking over the new reel to the previous reel, that is, a process of replacing the previous reel with the new reel when the previous reel is about to complete the unwinding. To improve the efficiency of this handoff process, an invention patent entitled "spool unwinder and unwinding method," patent No. 2012800656895, provides a design. The design scheme can complete the process of taking over the previous winding drum by the new winding drum under the condition that the previous winding drum does not stop rotating.

However, the design provided by this patent suffers from the following drawbacks:

1. three positions for positioning the reel must be provided in the mechanism, respectively a first unwinding position, a second unwinding position and a standby position. During the transfer, a new reel must be placed in advance in the standby position, from which it is transferred again after the previous reel has been moved from the first unwinding position to the second unwinding position. Therefore, the whole mechanism is complex, the moving steps of the operation winding drum are more, and the working efficiency of the mechanism is reduced.

2. The stand-by position is arranged above the first unwinding position, increasing the height of the whole mechanism, in particular by at least 1.5m for setting the stand-by position, in the case of a reel diameter of approximately 1.5 m.

3. The new reel must start unwinding before reaching the first unwinding position and therefore an unwinding member associated with the standby position must be provided to ensure that the new reel starts rotating before reaching the first unwinding position, which increases the complexity of the mechanism.

4. The former reel must be moved from the first unwinding position to the second unwinding position until the former reel is about to finish unwinding, and the operation of moving the new reel from the standby position to the first unwinding position must be completed before the former reel finishes unwinding, leaving a short operating time for workers and a short operating time. If the previous roll is moved to the second unwinding position and the new roll is moved to the first unwinding position too early in order to increase the time left for the worker to operate, the web exiting from the new roll will overlap too much with the web exiting from the previous roll, resulting in the web exiting from the previous roll not being used up, resulting in waste.

5. It is necessary to provide in the mechanism an endless flexible element extending from a first unwinding position to a second unwinding position, relying on the stretching deformation of the endless element to maintain the rotation of the reel during its transfer from the first unwinding position to the second unwinding position, which not only increases the complexity of the movement of the mechanism but also reduces the durability of the endless element.

Disclosure of Invention

The object of the present invention is to provide an unwinding mechanism for a web in the form of a roll which is capable of partially or completely overcoming the drawbacks of the prior art described above.

The invention is realized by the following steps: the unwinding mechanism for a web in a roll shape includes a first circulating element that drives the roll to rotate at a first unwinding position, a roll displacement mechanism that drives the roll to move from the first unwinding position to a second unwinding position, and a web guide mechanism that guides the web unwound from the roll to travel. In addition, the unwinding mechanism is also provided with a first moving mechanism for driving the first circulating element to move between a driving station and a releasing station, and in the driving station, the first circulating element is in contact with the winding drum positioned at the first unwinding position and drives the winding drum to rotate; at the release station, the first circulation element is detached from the reel in the first unwinding position; the second circulating element is in contact with the winding drum and drives the winding drum to keep rotating in the process that the winding drum moves from the first unwinding position to the second unwinding position; a second moving mechanism is provided for driving the second circulating member to move following the winding drum.

As a preferred but not necessary embodiment, said first movement mechanism drives said first cyclic element in oscillation about an oscillation axis between said driving station and a release station.

As a preferred but not necessary embodiment, said first circulating element is an endless belt wound around a pulley having an axis in line with the axis of oscillation of said first circulating element.

In a preferred, but not necessary, embodiment, the second moving mechanism drives the second endless element to oscillate about an oscillation axis, so that the second endless element follows the web.

As a preferred but not necessary embodiment, said second circulating element is an endless belt wound around a pulley having an axis in line with the axis of oscillation of said second circulating element.

In a preferred, but not necessary, embodiment, the reel displacement mechanism is provided with a slider slidably connected to the frame of the unwinding mechanism and a driving mechanism for driving the slider to slide, the slider is connected to a lifting hook and a driving mechanism for driving the lifting hook to lift, and when the lifting hook is lifted and moves along with the slider, the lifting hook pushes the reel to move.

Preferably, but not necessarily, the sliding block and the lifting hook are respectively connected with a roller, and the roller clamps the middle shaft of the winding drum.

Preferably, though not necessarily, a slide rail is provided on the frame of the unwinding mechanism, and the slide rail supports the central axis of the drum during the drum displacement mechanism drives the drum to move from the first unwinding position to the second unwinding position.

In a preferred, but not necessary embodiment, the frame of the unwinding mechanism is provided with a recess, by which the central axis of the reel in the first unwinding position is carried.

Preferably, but not necessarily, a kick hook is disposed on a frame of the unwinding mechanism, the kick hook is connected to the driving mechanism and can move up and down, and when the driving mechanism drives the kick hook to move up, the kick hook pushes a central shaft of the reel supported in the groove out of the groove.

The invention has the advantages that a standby position special for placing a new reel does not need to be arranged in the unwinding mechanism, the rotation of the reel does not need to be maintained by means of the stretching deformation of the circulating element, and the invention has the following advantages:

1. in the process of handing over the new reel to replace the previous reel, the new reel can be directly placed to the first unwinding position, the operation steps of moving the reel are reduced, and the working efficiency of the mechanism is improved.

2. The standby position and the unwinding member associated with the standby position are omitted, the whole mechanism is simpler and more reliable, the height of the whole mechanism can be reduced by at least 2m, and the occupied space is remarkably reduced.

3. It is not necessary to start rotating the new reel before it is placed in the first unwinding position, even after it has been placed in the first unwinding position, which gives the operating worker ample time to complete the reel replacement operation. The operator can transfer the previous roll from the first unwinding position to the second unwinding position even when the previous roll has just started unwinding, so that a new roll can be placed in the first unwinding position for standby without any difficulty, and the operator does not have to wait until the previous roll is about to finish unwinding to rush to move the roll.

4. The circulating flexible element extending from the first unwinding position to the second unwinding position is not required to be arranged, the rotation of the winding drum is not required to be maintained by means of stretching deformation of the circulating element during the process that the winding drum is transferred from the first unwinding position to the second unwinding position, the mechanism is simplified, and the durability of the circulating element is improved.

Drawings

FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 2 is a schematic view of the second circulation element driving the self-transfer of the reel in the first unwinding position;

FIGS. 3-4 are schematic views of the spool moving from a first unwinding position to a second unwinding position;

FIG. 5 is a schematic view of a new roll being placed in a first unwinding position;

FIG. 6 is a schematic view of the new roll exiting web overlapping the previous roll exiting web;

FIG. 7 is a schematic view of the previous roll ending unwinding and the new roll continuing unwinding;

FIG. 8 is a schematic view of an embodiment of a driving mechanism to which the slider, the lifting hook and the kicking hook are connected;

FIG. 9 is a schematic view of an embodiment of a first movement mechanism and a second movement mechanism;

fig. 10 is a schematic structural diagram of a second embodiment of the present invention.

Detailed Description

To facilitate an understanding of the invention, the invention is described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "clockwise rotation," "counterclockwise rotation," "left," "right," and the like are used herein for illustrative purposes only. The terms "first" and "second" used herein do not denote any particular order or quantity, but rather are used to distinguish one element from another.

Example one

Referring to fig. 1, the unwinding mechanism of the web in roll form includes a first circulation element 1 that drives the roll 2 to rotate at a first unwinding position Q1, and a roll displacement mechanism that drives the roll 2 to move from the first unwinding position Q1 to a second unwinding position Q2.

Specifically, the first circulating element 1 is an endless belt, and the reel 2 is driven to rotate in the unwinding direction by virtue of the frictional force between the endless belt and the reel 2. The reel 2 is wound from a web material. When the reel 2 rotates in the unwinding direction, the web 3 exits from the reel 2. The web may be, but is not limited to, paper, nonwoven, and the like. It should be noted that, although the roll and the web are illustrated in the drawings of the present invention, the roll and the web are not structural components of the present invention, and are merely the operation objects of the unwinding mechanism according to the present invention.

Specifically, the reel displacement mechanism is provided with a slider 4 slidably connected to the frame of the unwinding mechanism, and a driving mechanism for driving the slider 4 to slide. The slide block 4 is connected with a lifting hook 5 and a driving mechanism for driving the lifting hook 5 to lift. More specifically, the lifting hook 5 is hinged to the slider 4, and when the lifting hook 5 rotates counterclockwise around the hinge shaft 6, the lifting hook 5 is raised, and when the lifting hook 5 rotates clockwise around the hinge shaft 6, the lifting hook 5 is lowered. As shown in fig. 3 to 4, when the lifting hook 5 is lifted and moves along with the slider 4, the lifting hook 5 pushes the roll 2 to move from the first unwinding position Q1 to the second unwinding position Q2. Specifically, the lifting hook 5 moves the reel 2 by pushing the central axis of the reel 2.

The driving mechanism for driving the sliding block to slide can be selected from an air cylinder, a servo motor or other driving structures. In an alternative embodiment, as shown in fig. 8, an air cylinder 17 is connected between the sliding block 4 and the frame, and the sliding block 4 is driven to slide by the air cylinder 17.

The driving mechanism for driving the lifting hook to lift can be selected from an air cylinder, a servo motor or other driving structures. In an alternative embodiment, as shown in fig. 8, an air cylinder 18 is connected between the slider 4 and the lifting hook 5, and the air cylinder 18 drives the lifting hook 5 to rotate clockwise or counterclockwise around the hinge shaft 6.

The unwinding mechanism is further provided with a web guide mechanism guiding the web travel. In particular, with reference to fig. 1, the web guiding mechanism comprises a pulling roll 7 which nips the web. The web 3 exiting from the reel drum 2 is continuously run under the guiding action of the drawing rolls 7. For better guidance of the web, a guide plate 17 is provided in front of the drawing roll 7.

The unwinding mechanism is further provided with a first moving mechanism that drives the first circulating element 1 to move between the driving station and the release station. When the first circulation member 1 is located at the driving station, as shown in fig. 1, the first circulation member 1 is kept in contact with the reel 2 located at the first unwinding position Q1, thereby driving the reel 2 to rotate; when the first circulation element 1 is in the release station, as shown in fig. 2, the first circulation element 1 is separated from the reel in the first unwinding position Q1. Specifically, as shown in fig. 1 to 2, the first moving mechanism drives the first endless element 1 to oscillate about an oscillation axis between the drive station and the release station. More specifically, the first circulating element 1 is an endless belt, and the axis of one pulley 8 around which the endless belt is wound is the oscillation axis of the endless belt, that is, the oscillation axis of the first circulating element 1. The first moving mechanism that drives the first endless element 1 to move between the drive station and the release station may be selected as a pneumatic cylinder, a servo motor or other drive structure. In an alternative embodiment, as shown in fig. 9, the first circulating element 1 is mounted on a swing bracket 20, the swing axis of the swing bracket 20 is the swing axis of the first circulating element 1, a cylinder 21 is connected between the swing bracket 20 and the frame, and the swing bracket 20 is driven by the cylinder 21 to swing together with the first circulating element 1.

It should be noted that the first endless element 1 shown in the figures may be constituted by a plurality of endless belts arranged in parallel along the axis of the pulley 8, and accordingly, the pulley 8 may be constituted by a plurality of pulleys mounted on the same rotating shaft.

It should be noted that the oscillation axis of the first circulating element 1 does not necessarily need to be the axis of one of the pulleys.

It should be noted that the first circulating member 1 is not limited to the circulating belt, and may be, for example, a rotating roller which is kept in contact with the reel at the first unwinding position Q1 and drives the reel to rotate when the rotating roller is at the driving station, and which is separated from the reel at the first unwinding position Q1 when the rotating roller is at the releasing station.

It should be noted that the manner in which the first endless element 1 is moved between the drive station and the release station is not limited to oscillation, and may be, for example, integral translation of the first endless element 1.

Referring to fig. 1, a slide rail 9 is provided on the frame of the unwinding mechanism, and the slide rail 9 supports the central axis of the winding drum 2 during the process that the winding drum displacement mechanism drives the winding drum 2 to move from the first unwinding position Q1 to the second unwinding position Q2.

Referring to fig. 1 and 4, a groove 10 is provided on the frame of the unwinding mechanism, and the groove 10 supports the central axis of the roll 2 located at the first unwinding position Q1. The groove 10 serves for positioning the roll 2.

Referring to fig. 1 and 4, a kicking hook 11 close to a groove 10 is arranged on a frame of the unwinding mechanism, and the kicking hook 11 is connected with a driving mechanism and can move up and down. Referring to fig. 3, when the driving mechanism drives the kick hook 11 to move upward, the kick hook 11 pushes the central axis of the reel 2 supported in the groove 10 out of the groove 10. Specifically, the kick hook 11 is hinged to the frame, and the kick hook 11 moves up and down in a manner of swinging up and down around the hinge shaft 12. In a possible embodiment, the way of moving the kick hook 11 up and down can also be a whole up and down translation.

The driving mechanism for driving the kick hook to move up and down can be selected from an air cylinder, a servo motor or other driving structures. In an alternative embodiment, as shown in fig. 8, an air cylinder 19 is connected between the kick hook 11 and the frame, and the kick hook 11 is driven by the air cylinder 19 to swing up and down around the hinge shaft 12.

Referring to fig. 1, the unwinding mechanism is further provided with a second circulating member 13, and a second moving mechanism that drives the second circulating member to move following the winding drum. As shown in fig. 3 to 4, in the process of the movement of the reel 2 from the first unwinding position Q1 to the second unwinding position Q2, the second moving mechanism drives the second circulating element 13 to follow the movement of the reel 2, keeps the second circulating element 13 in contact with the reel 2 and drives the reel 2 to keep rotating. After the spool 2 moves to the second unwinding position Q2, the second circulation element 13 continues to drive the spool to maintain the rotation.

The second moving mechanism for driving the second circulating element to move along with the winding drum can be selected from an air cylinder, a servo motor or other driving structures. In an alternative embodiment, as shown in fig. 9, the second circulating element 13 is mounted on a swing bracket 22, the swing axis of the swing bracket 22 is the swing axis of the second circulating element 13, a cylinder 23 is connected between the swing bracket 22 and the frame, and the swing bracket 22 is driven by the cylinder 23 to swing together with the second circulating element 13.

Specifically, as shown in fig. 3 to 4, the second moving mechanism drives the second endless element 13 to oscillate about one oscillation axis, thereby moving the second endless element 13 to follow the roll 2. More specifically, the second circulating element 13 is an endless belt, and the axis of one pulley 14 around which the endless belt is wound is the oscillation axis of the endless belt, that is, the oscillation axis of the second circulating element 13.

It should be noted that the second endless element 13 shown in fig. 1 may be constituted by a plurality of endless belts arranged in parallel along the axis of the pulley 14, and accordingly, the pulley 14 may be constituted by a plurality of pulleys mounted on the same rotating shaft.

It should be noted that the oscillation axis of the second circulating element 13 does not necessarily need to be the axis of one of the pulleys 14.

The second circulating member 13 is not limited to the circulating belt, and may be a rotating roller, for example, and the drum is driven to rotate by friction between the rotating roller and the drum.

It should be noted that the manner in which the second circulation element 13 moves along with the reel is not limited to the oscillation, and may be, for example, the entire second circulation element 13.

The operation principle of the present embodiment will be described in detail with reference to the drawings.

Referring to fig. 1, the reel 2 wound by the web material is placed at the first unwinding position Q1, the first circulation member 1 is located at the driving station, and the first circulation member 1 drives the reel 2 to rotate in the unwinding direction by friction. The web 3 exiting from the reel drum 2 is continuously run under the guiding action of the drawing rolls 7.

Fig. 2 shows the subsequent step, in which the second circulating element 13 is moved into contact with the reel 2, the first circulating element 1 then being separated from the reel 2. After that, the second circulation element 13 drives the reel 2 to unwind continuously by means of friction. In one possible embodiment, the first circulation element 1 and the second circulation element 13 are simultaneously in contact with the roll 2, and the roll 2 located at the first unwinding position Q1 is driven to rotate by the first circulation element 1 and the second circulation element 13 in synchronization with each other.

Fig. 3 shows the subsequent step, in which the diameter of the reel 2 is gradually reduced as the unwinding proceeds, but the second circulating element 13 is always in contact with the reel 2 and drives the reel 2 unwinding continuously.

When the reel 2 being unwound needs to be moved from the first unwinding position Q1 to the second unwinding position Q2, as shown in fig. 3, the slider 4 drives the lifting hook 5 to move below the central axis of the reel 2, and the kick hook 11 moves upward along with the lifting hook, so as to eject the central axis of the reel 2 from the groove 10. The lifting hook 5 is raised accordingly, ready for pushing the reel 2.

Fig. 4 shows the subsequent step in which the lifting hook 5 pushes the central shaft of the reel 2 with the movement of the slider 4, moving the reel 2 from the first unwinding position Q1 to the second unwinding position Q2.

During the movement of the reel 2 from the first unwinding position Q1 to the second unwinding position Q2, the second circulating element 13 follows the movement of the reel 2 and maintains contact with the reel 2, keeping the reel 2 unwound. After the roll 2 has moved to the second unwinding position Q2, the roll is continuously driven by the second circulation element 13 to maintain the unwinding.

It should be noted that it is not necessary to wait until the unwinding of the spool is about to end before moving the spool from the first unwinding position Q1 to the second unwinding position Q2. The spool can be moved from the first unwinding position Q1 to the second unwinding position Q2 as long as the diameter of the spool is reduced to such an extent that the spool moved to the second unwinding position Q2 does not interfere with a new spool subsequently placed to the first unwinding position Q1. This allows ample time for the placement of a new roll into the first unwinding position Q1.

Fig. 5 shows the subsequent step in which a new reel 2' is placed in the first unwinding position Q1. It is not so urgent to move the first circulation element 1 to the driving station. In the condition of fig. 5, the new reel 2' is simply placed in the first unwinding position Q1 and does not rotate.

When the unwinding of the previous reel 2 is about to end, the first circulation element 1 moves, as shown in figure 6, to the driving station, driving the new reel 2' to start unwinding. The web 3 'exiting from the new reel 2' overlaps the web 3 exiting from the previous reel 2 and travels together under the guidance of the drawing roller 7.

Fig. 7 shows the subsequent step, in which the previous reel 2 has finished unwinding, the web 3 exiting from the previous reel 2 being severed. The previous roll 2 can now be moved out of the unwinding mechanism. The whole mechanism now returns to the state shown in figure 1, except that the previous roll 2 is replaced by a new roll 2'. By repeating the above steps, the new reel can take over the previous reel one by one without stopping the rotation of the reel.

The web can be severed by, but not limited to, cutting the web with a cutter or by quickly pulling the web off the previous roll.

In the process from fig. 2 to fig. 3, the second circulation element 13 is not necessarily required to drive the reel 2 to unwind, but the reel 2 may be driven by the first circulation element 1 to unwind until the reel 2 needs to be moved from the first unwinding position Q1 to the second unwinding position Q2, and the reel 2 may be driven by the second circulation element 13 to unwind.

Example two

Referring to fig. 10, the structure of the present embodiment is different from that of the first embodiment in that the kick hook 11 of the first embodiment and the groove 10 on the frame are eliminated, the shape of the lifting hook 5 is different, and the slider 4 and the lifting hook 5 are respectively connected with a roller 15 and a roller 16.

The operating principle of the present embodiment is different from that of the first embodiment in that the central axis of the spool is held by the

rollers

15 and 16 no matter whether the spool is located at the first unwinding position Q1 or the second unwinding position Q2, or during the movement of the spool from the first unwinding position Q1 to the second unwinding position Q2.

The structure and operation principle not described in detail in this embodiment are the same as those in the first embodiment, and are not described again.

It should be noted that, depending on the type of web product, some rolls are fixedly connected with a central shaft, called shafted rolls, and others are not fixedly connected with a central shaft, called shaftless rolls. However, even a shaftless reel requires a component serving as a center shaft, such as a plug bush temporarily attached to an end surface of the reel, to be temporarily attached to the reel when the reel is used as an operation target of the unwinding mechanism. Therefore, the invention does not distinguish whether the central shaft of the winding drum is provided with the winding drum itself or the part which is temporarily arranged on the winding drum and plays the role of the central shaft, and the parts are collectively called the central shaft of the winding drum.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An unwinding mechanism for a web in a roll shape, including a first circulation element for driving a roll to rotate at a first unwinding position, a roll displacement mechanism for driving the roll to move from the first unwinding position to a second unwinding position, and a web guide mechanism for guiding the web unwound from the roll to travel, characterized in that: a first moving mechanism for driving the first circulating element to move between the driving station and the releasing station is arranged; at the driving station, the first circulating element is in contact with the reel located at the first unwinding position and drives the reel to rotate; at the release station, the first circulation element is detached from the reel in the first unwinding position; a second circulating element is arranged, and in the process that the winding drum moves from the first unwinding position to the second unwinding position, the second circulating element is in contact with the winding drum and drives the winding drum to keep rotating; a second moving mechanism is provided for driving the second circulating member to move following the winding drum.

2. An unwinding mechanism for a web material in roll form according to claim 1, characterized in that said first moving mechanism drives said first circulating element to oscillate about an oscillation axis between said driving station and a release station.

3. An unwinding mechanism for a web material in roll form according to claim 2, characterized in that said first circulating element is an endless belt wound around a pulley having an axis in line with the oscillation axis of said first circulating element.

4. An unwinding mechanism for a web material in roll form according to claim 1, characterized in that said second moving mechanism drives said second circulating element to oscillate about an oscillation axis, so that said second circulating element follows the roll movement.

5. An unwinding mechanism for a web material in roll form according to claim 4, characterized in that said second circulating element is an endless belt wound around a pulley having an axis in line with the oscillation axis of said second circulating element.

6. An unwinding mechanism for a web material in roll form according to claim 1, characterized in that the roll displacement mechanism is provided with a slider slidably connected to the frame of the unwinding mechanism and a driving mechanism for driving the slider to slide, the slider is connected to a lifting hook and a driving mechanism for driving the lifting hook to lift, when the lifting hook is lifted and moves along with the slider, the lifting hook pushes the roll to move.

7. The unwinding mechanism for web material in roll form according to claim 6, wherein rollers are respectively connected to said slider and said lifting hook, and the central shaft of the roll is held by the rollers.

8. An unwinding mechanism for a web material in roll form according to claim 1, characterized in that a slide is provided on the frame of the unwinding mechanism, and the slide supports the central axis of the roll during the movement of the roll from said first unwinding position to said second unwinding position driven by said roll displacement mechanism.

9. Unwinding mechanism for a web material in the form of a reel as claimed in claim 1, characterized in that a recess is provided in the frame of the unwinding mechanism, by which recess the central axis of the reel in the first unwinding position is supported.

10. An unwinding mechanism for web material in roll form according to claim 9, characterized in that a kick hook is provided on the frame of the unwinding mechanism near the groove, the kick hook is connected to the driving mechanism for up-and-down movement, and when the driving mechanism drives the kick hook to move up, the kick hook pushes the central shaft of the roll supported in the groove out of the groove.