CN112849616A

CN112849616A - Labeller and go out mark device thereof

Info

Publication number: CN112849616A
Application number: CN202110007586.4A
Authority: CN
Inventors: 么军亮
Original assignee: Meichao Group Co ltd
Current assignee: Meichao Group Co ltd
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2021-05-28

Abstract

The invention discloses a labeling machine and a label discharging device thereof, wherein the label discharging device comprises a bracket and a first rotating shaft which is rotatably arranged on the bracket; the brake assembly comprises at least one section of brake band and at least one elastic piece, and a first end of the brake assembly is fixed with the bracket; the driving lever comprises a first rod and a second rod which are fixedly connected, the first rod is hinged with the support, and the second end of the brake assembly is fixedly connected with the first rod; the driving part is used for driving the driving shaft to rotate; when the driving shaft rotates, the label roll is indirectly driven to rotate through the label paper, and when the label roll rotates, the driving lever is indirectly driven to rotate through the label paper, so that the tension of the elastic piece is reduced; when the driving shaft stops rotating, the shifting lever rotates reversely so that the tension of the elastic element is increased. The label discharging device has a structural design which can effectively reduce the condition that the label roll is loosened or pulled apart.

Description

Labeller and go out mark device thereof

Technical Field

The invention relates to the technical field of packaging equipment, in particular to a labeling machine and a label discharging device thereof.

Background

The food packaging industry commonly uses a device called a labeling machine, for example, labels on the side surfaces of bottled chewing gum bottles, when the labels on the side surfaces of the bottles are labeled, one driving mechanism firstly rotates the bottles, the other driving mechanism sends one label to the side surfaces of the bottles, and the labeling speed of the labels is consistent with the linear speed of the outer side surfaces of the bottles, so that the labels can be uniformly and flatly labeled.

The labels are attached to the specially treated surface of the base paper, and a small gap is formed between adjacent labels. The base paper with the label is usually rolled into a label roll for use. During the production process, the operator installs the label roll on the labeling machine and starts the machine to start labeling. The bottles entering the labeling machine on the production line are labeled by the label discharging device and then discharged to the subsequent working sections.

The more bottles that enter the labelling machine per unit of time, the more frequent the action of driving the rotation of the label roll. As the production is carried out, the outer diameter of the label roll is gradually reduced, so that when the linear speed of label discharging is not changed, the angular speed of the label roll rotation is increased, and the label backing paper is easy to be broken or loosened when the labeling mechanism fails. The connection is required again after the snapping, so that the time is delayed and the efficiency is influenced; label slack can cause unstable label placement or two labels at a time.

Disclosure of Invention

In view of the above, the first object of the present invention is to provide a label dispenser, which has a structure designed to effectively reduce the loosening or breaking of label roll, and the second object of the present invention is to provide a labeling machine including the label dispenser.

In order to achieve the first object, the invention provides the following technical scheme:

a bid apparatus, comprising:

the label roll comprises a bracket and a first rotating shaft which is rotatably arranged on the bracket, wherein the first rotating shaft is used for placing a label roll, and an inner ring of the label roll can be relatively fixed with the first rotating shaft;

the brake assembly comprises at least one section of brake band and at least one elastic piece, the elastic piece and the brake band are connected in series to form the brake assembly, the first end of the brake assembly is fixed with the support, and one brake band of the brake assembly bypasses the first rotating shaft and is in contact with the first rotating shaft;

the driving lever comprises a first rod and a second rod which are fixedly connected, the first rod is hinged with the support, and the second end of the brake assembly is fixedly connected with the first rod;

the free end of the label roll sleeved on the first rotating shaft can sequentially bypass the second rod and the driving shaft, and the driving piece is used for driving the driving shaft to rotate;

when the driving shaft rotates, the label roll is indirectly driven to rotate through the label paper, and when the label roll rotates, the driving lever is indirectly driven to rotate through the label paper, so that the tension of the elastic piece is reduced; when the driving shaft stops rotating, the shifting lever rotates reversely so that the tension of the elastic element is increased.

Preferably, in the above marking device, a return spring is further included, a first end of the return spring is fixedly connected to the bracket, and a second end of the return spring is connected to the first rod.

Preferably, in the mark discharging device, the first rod is provided with a strip-shaped hole along the length direction of the first rod, the second end of the return spring is connected with a clamping rod, and the clamping rod is clamped in the strip-shaped hole and can slide to a set position along the strip-shaped hole and then is fixed with the first rod.

Preferably, in the above marking device, the bracket is further provided with a fixed pulley, and the brake assembly sequentially bypasses the first rotating shaft and the fixed pulley.

Preferably, in the marking device, the position of the first rod for connecting with the second end of the brake assembly is higher than the position of the first rod hinged with the bracket.

Preferably, in the marking device, the brake assembly includes a first section of brake band, an elastic member and a second section of brake band, which are connected in sequence.

Preferably, in the above marking device, the elastic member is a spring.

Preferably, the label discharging device further comprises at least one driven shaft rotatably disposed on the bracket, and the free end of the label roll sleeved on the first rotating shaft can bypass the driven shaft.

A labelling machine comprising a label discharge apparatus as claimed in any preceding claim.

The mark outputting device provided by the embodiment of the invention comprises a support, a first rotating shaft, a brake assembly, a shifting rod, a driving piece and a driving shaft. The label paper is wound into a roll to form a label roll.

The first rotating shaft is rotatably arranged on the bracket, namely the first rotating shaft can rotate relative to the bracket. The first rotating shaft is used for placing the label roll. The label is rolled up and is established on first pivot promptly, and the inner circle of label book is fixed relatively with first pivot, and the label is rolled up and first pivot can rotate for the support together to the realization is put the tag paper. Namely, the label roll and the first rotating shaft are coaxially arranged, and the label roll and the first rotating shaft cannot relatively rotate.

The brake assembly includes at least one brake band and at least one elastic member, the elastic member being extendable in length. The first end of the brake assembly is fixed to the bracket, in other words, the first end of the brake assembly is fixed to the bracket. The brake component bypasses the first rotating shaft and is contacted with the first rotating shaft.

The driving lever comprises a first rod and a second rod which are fixedly connected. The angle between the first and second bars is greater than 0 deg.. The first lever is hinged with the bracket so as to realize that the whole deflector rod can rotate relative to the bracket.

The second end of the brake assembly is fixedly connected with the first rod, and when the whole deflector rod rotates relative to the support, the first rod drives the second end of the brake assembly to move so as to adjust the tension of the elastic element.

The driving piece is used for driving the driving shaft to rotate. The free end of the label roll sleeved on the first rotating shaft can sequentially bypass the second rod and the driving shaft.

When the driving shaft rotates, the label roll paper is indirectly driven to rotate through the label paper, and the label roll paper moves to drive the driving lever to rotate so that the tension of the elastic piece is reduced. Specifically, when the driving piece drives the driving shaft to rotate, the driving shaft drives the label roll paper to move, and then the label roll paper drives the second rod and the first rotating shaft to rotate. The second rod rotates to rotate the entire lever relative to the bracket to effect that the first rod of the lever drives the second end of the brake assembly to move, thereby reducing the tension of the elastic member.

When the driving part stops driving, the driving shaft stops rotating, the driving lever rotates reversely to realize that the first rod of the driving lever drives the second end of the brake component to move reversely, and further the tension of the elastic part is increased.

When using the mark device that goes out that above-mentioned embodiment provided, when the packing bottle was through need labeling, when the driving piece drove the driving shaft and rotates, the driving shaft drove the label paper and removes to make the label paper remove to realize labeling with the packing bottle contact. In the labeling process, when the driving shaft drives the label paper to move, the label paper drives the second rod and the first rotating shaft to rotate so as to realize that the first rod of the driving lever drives the second end of the brake component to move, and finally, the tension of the elastic component is reduced. The tension of the elastic piece is reduced, so that the first rotating shaft can rotate smoothly, and the condition that the label paper is broken due to the fact that the friction force between the brake assembly and the first rotating shaft is too large due to the fact that the tension of the elastic piece is too large is avoided.

When the gap between two adjacent packaging bottles passes through the label discharging device, the driving piece stops driving, the driving lever rotates reversely after the driving shaft stops rotating, so that the first rod of the driving lever drives the second end of the brake assembly to move reversely, and finally the tension of the elastic piece is increased. The tension of the elastic member is increased so that the friction force between the brake assembly and the first rotating shaft is increased, and the first rotating shaft is more conveniently braked. Therefore, the situation that the label paper is loosened due to untimely braking of the first rotating shaft after the driving piece and the driving shaft stop rotating is avoided.

In order to achieve the second object, the invention further provides a labeling machine, which comprises any one of the labeling devices. Because the label discharging device has the technical effects, the labeling machine with the label discharging device also has the corresponding technical effects.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a label discharge process of a label discharge device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a label issuing device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a label discharge process of a label discharge apparatus according to another embodiment of the present invention;

fig. 4 is a schematic structural diagram of a label discharge process of a label discharge apparatus according to another embodiment of the present invention;

fig. 5 is a schematic structural diagram of a part of a label discharge apparatus according to an embodiment of the present invention.

In fig. 1-5:

the brake comprises a support 1, a return spring 2, a fixed pulley 3, a brake assembly 4, a brake band 4a first section, an elastic part 4b, a brake band 4c, a second brake band 5, a first rotating shaft 6, a label roll 7, a deflector rod 7a, a second rod 7b, a first rod 8, a driven shaft 9 and a rotary table 9.

Detailed Description

A first object of the present invention is to provide a label dispenser which is designed to effectively reduce the loosening or snapping of a label roll, and a second object of the present invention is to provide a labeling machine including the label dispenser.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left" and "right", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the positions or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus are not to be construed as limitations of the present invention. For example, it is within the scope of the present invention to mount the apparatus of FIGS. 1-5 upside down. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1 to 5, a label output apparatus according to an embodiment of the present invention includes a bracket 1, a first rotating shaft 5, a brake assembly 4, a shift lever 7, a driving member and a driving shaft. The label paper is wound into a roll to form a label roll 6.

The first rotating shaft 5 is rotatably disposed on the bracket 1, that is, the first rotating shaft 5 can rotate relative to the bracket 1. The first shaft 5 is used for placing a roll of labels 6. Namely, the label roll 6 is sleeved on the first rotating shaft 5, the inner ring of the label roll 6 is fixed relative to the first rotating shaft 5, and the label roll 6 and the first rotating shaft 5 can rotate together relative to the bracket 1 to realize the placement of the label roll 6. That is, the label roll 6 and the first rotating shaft 5 are coaxially arranged, and the label roll 6 and the first rotating shaft 5 do not relatively rotate.

The brake assembly 4 comprises at least one brake band and at least one resilient member 4b, i.e. the resilient member 4b is telescopically long. The first end of the brake assembly 4 is fixed to the bracket 1, in other words, the first end of the brake assembly 4 is fixed to the bracket 1. The brake assembly 4 bypasses the first rotation shaft 5 and contacts the first rotation shaft 5. The part of the brake band in contact with the first rotating shaft is preferably a rigid band, and the elastic band can be selected when the performance of the device is not influenced

The shift lever 7 includes a first rod 7b and a second rod 7a fixedly connected. The angle between the first 7b and second 7a rods is greater than 0 deg.. The first lever 7b is articulated to the support 1, so that the entire lever 7 can rotate relative to the support 1. The second lever 7a may be a roller hinged to the first lever 7b, the roller being rotatable about its own axis. When the label paper moves around the second rod 7a, the roller is driven to rotate, so that friction between the label paper and the second rod 7a is reduced.

The second end of the brake assembly 4 is fixedly connected with the first rod 7b, and when the whole shift lever 7 rotates relative to the bracket 1, the first rod 7b drives the second end of the brake assembly 4 to move so as to adjust the tension of the elastic element 4 b.

The driving piece is used for driving the driving shaft to rotate. The free end of the label roll 6 fitted over the first rotary shaft 5 can be passed around the second lever 7a and the driving shaft in this order.

When the driving shaft rotates, the label roll 6 is driven to rotate, and the label paper moves to drive the shift lever 7 to rotate so that the tension of the elastic piece 4b is reduced. Specifically, when the driving member drives the driving shaft to rotate, the driving shaft drives the label paper to move, and then the label paper drives the second rod 7a and the first rotating shaft 5 to rotate. The second rod 7a rotates to rotate the whole shift lever 7 relative to the bracket 1, so that the first rod 7b of the shift lever 7 drives the second end of the brake assembly 4 to move, and the tension of the elastic element 4b is reduced.

When the driving element stops driving, after the driving shaft stops rotating, the driving lever 7 rotates reversely, so that the first rod 7b of the driving lever 7 drives the second end of the brake assembly 4 to move reversely, and further the tension of the elastic element 4b is increased.

When using the mark device that goes out that above-mentioned embodiment provided, when the packing bottle was through need labeling, when the driving piece drove the driving shaft and rotates, the driving shaft drove the label paper and removes to make the label paper remove to realize labeling with the packing bottle contact. In the labeling process, when the driving shaft drives the label paper to move, the label paper drives the second rod 7a and the first rotating shaft 5 to rotate, so that the first rod 7b of the driving lever 7 drives the second end of the brake assembly 4 to move, and finally the tension of the elastic piece 4b is reduced. The tension of the elastic part 4b is reduced to enable the first rotating shaft 5 to rotate smoothly, and the situation that the label paper is broken due to the fact that the friction force between the brake component 4 and the first rotating shaft 5 is too large and the first rotating shaft 5 is not rotated smoothly due to the fact that the tension of the elastic part 4b is too large is avoided.

When the gap between two adjacent packaging bottles passes through the label discharging device, when the driving part stops driving, the driving rod 7 rotates reversely after the driving shaft stops rotating, so that the first rod 7b of the driving rod 7 drives the second end of the brake assembly 4 to move reversely, and finally the tension of the elastic part 4b is increased. The tension of the elastic member 4b is increased so that the frictional force between the brake assembly 4 and the first rotating shaft 5 is increased to facilitate braking of the first rotating shaft 5. Therefore, the condition that the label paper is loosened due to untimely braking of the first rotating shaft 5 after the driving piece and the driving shaft stop rotating is avoided.

It should be noted here that the rotation axis of the first rotating shaft 5, the rotation axis of the shift lever 7, and the rotation axis of the driving shaft are all arranged in parallel to each other.

In an embodiment, in order to make the driving member and the driving shaft stop rotating and then make the shift lever 7 rotate reversely, the marking device may further include a return spring 2, a first end of the return spring 2 is fixedly connected with the bracket 1, and a second end of the return spring 2 is connected with the first rod 7 b. Therefore, when the driving shaft drives the label paper to move, the label paper drives the second rod 7a and the first rotating shaft 5 to rotate, so that the first rod 7b of the driving lever 7 drives the second end of the brake assembly 4 and the second end of the return spring 2 to move. After the driving piece and the driving shaft stop rotating, the acting force of the driving shaft on the label paper disappears, and the second rod 7a of the driving lever 7 reversely rotates under the action of the reset spring 2, so that the reset of the driving lever 7 is realized.

Further, as shown in fig. 1-3, the first rod 7b is provided with a strip-shaped hole along the length direction thereof, the second end of the return spring 2 is connected with a clamping rod, and the clamping rod is clamped in the strip-shaped hole and can slide along the strip-shaped hole to a set position and then be fixed with the first rod 7 b. So set up, slide the second end of kelly and reset spring 2 to the settlement position back along the bar hole, it is fixed with kelly and first pole 7b again. Specifically, the clamping rod may be fixedly connected to the first rod 7b by a fixing block, a screw, and the like, which is not limited herein.

When the first rod 7b of the shift lever 7 drives the second end of the return spring 2 to move, the second end of the return spring 2 is preferably fixedly connected with the first rod 7b, and certainly, under the condition that label paper can be ensured to be tight and not to be pulled apart, and label discharge is also stable, the second end of the return spring 2 can also slide along the strip-shaped hole, and no limitation is made here.

Of course, a telescopic cylinder, a motor and the like can be used to drive the shift lever 7 to rotate reversely, and the invention is not limited herein.

In another embodiment, the bracket 1 is further provided with a fixed pulley 3, and the brake assembly 4 sequentially passes around the first rotating shaft 5 and the fixed pulley 3. Thus, the fixed pulley 3 is provided to more conveniently set the direction of the brake assembly 4 to fixedly connect the brake assembly 4 with the first rod 7 b.

The fixed sheave 3 may be disposed higher than the first rotating shaft 5. Further, the first rotating shaft 5, the first rod 7b and the fixed pulley 3 are sequentially arranged from bottom to top.

When the device is installed upside down, the relative high and low positions of all the parts are reversed.

In the above embodiment, the position of the first lever 7b for connecting with the second end of the brake assembly 4 is higher than the position of the first lever 7b hinged with the bracket 1. Preferably, the first lever 7b is hinged to the frame 1 at a position lower than the fixed pulley 3. So set up, when the driving piece drove the driving shaft and rotates, the driving shaft drove the label paper and removed, and then the label paper drove second pole 7a and first pivot 5 and rotates. The second rod 7a rotates to rotate the whole shift lever 7 relative to the bracket 1, so that the first rod 7b of the shift lever 7 drives the second end of the brake assembly 4 to move upwards, and the tension of the elastic element 4b is reduced.

When the driving element stops driving, after the driving shaft stops rotating, the shift lever 7 rotates reversely, so that the first rod 7b of the shift lever 7 drives the second end of the brake assembly 4 to move downwards, and further the tension of the elastic element 4b is increased.

Of course, the position of the first lever 7b for connection with the second end of the brake assembly 4 may also be lower than the position of the first lever 7b hinged to the bracket 1. The position of the first rod 7b hinged to the bracket 1 may be higher than the fixed pulley 3, and is not limited herein.

When the number of the braking bands and the elastic members 4b is plural, the plurality of braking bands and the plurality of elastic members 4b are connected in sequence, and the plurality of braking bands and the plurality of elastic members 4b may be arranged arbitrarily, which is not limited herein.

Preferably, both ends of any elastic member 4b are connected with two brake bands, respectively.

It should be noted that the portion of the brake assembly 4 contacting the first rotating shaft 5 is a brake band to brake the first rotating shaft 5.

In a particular embodiment, the brake assembly 4 comprises a first segment of brake band 4a, an elastic member 4b and a second segment of brake band 4c, connected in series. Thereby being more convenient for processing and manufacturing.

Preferably, in each of the above embodiments, the elastic member 4b may be a spring. Of course, the elastic member 4b may be other members, such as a rubber band, and the like, without being limited thereto.

In order to change the trend of the label paper, the label outputting device further comprises at least one driven shaft 8 which is rotatably arranged on the support 1, and the driven shaft 8 can rotate relative to the support 1. The free end of the label roll 6 fitted over the first rotating shaft 5 can pass around the driven shaft 8. The free end of the label roll 6 sleeved on the first rotating shaft 5 can sequentially bypass the second rod 7a, the driven shaft 8 and the driving shaft.

When the driving shaft drives the label paper to move, the label paper can drive the driven shaft 8 to rotate.

In another embodiment, the first rod 7b and the second rod 7a of the shift lever 7 may be disposed perpendicular to each other. Of course, the included angle between the first rod 7b and the second rod 7a may be an acute angle, and is not limited herein.

In order to prevent the label roll 6 from moving axially on the first rotating shaft 5, a rotating disc 9 is also fixed on the first rotating shaft 5, and the label roll 6 is abutted against the rotating disc 9 so as to realize the positioning of the rotating disc 9 on the label roll 6.

The first rotating shaft 5 is also provided with an annular bulge, and the label roll 6 is directly sleeved on the annular bulge, so that the label roll 6 and the first rotating shaft 5 are coaxially arranged.

Based on the label discharging device provided in the above embodiment, the present invention further provides a labeling machine, which includes any one of the label discharging devices in the above embodiments. Since the labeling machine adopts the label discharging device in the above embodiment, please refer to the above embodiment for the beneficial effects of the labeling machine.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A bid apparatus, comprising:

the label holder comprises a holder (1) and a first rotating shaft (5) which is rotatably arranged on the holder (1), wherein the first rotating shaft (5) is used for placing a label roll (6), and the inner ring of the label roll (6) can be relatively fixed with the first rotating shaft;

the brake assembly comprises at least one section of brake band and at least one elastic part (4b), the elastic part (4b) and the brake band are connected in series to form the brake assembly, the first end of the brake assembly (4) is fixed with the bracket (1), and one brake band of the brake assembly (4) bypasses the first rotating shaft (5) and is in contact with the first rotating shaft (5);

the driving lever (7) comprises a first rod (7b) and a second rod (7a) which are fixedly connected, the first rod (7b) is hinged with the support (1), and the second end of the brake component (4) is fixedly connected with the first rod (7 b);

the free end of a label roll (6) sleeved on the first rotating shaft (5) can sequentially bypass the second rod (7a) and the driving shaft, and the driving part is used for driving the driving shaft to rotate;

the label roll (6) is indirectly driven to rotate through label paper when the driving shaft rotates, and the shift lever (7) is indirectly driven to rotate through the label paper when the label roll (6) rotates, so that the tension of the elastic piece (4b) is reduced; when the driving shaft stops rotating, the deflector rod (7) rotates reversely so as to increase the tension of the elastic piece (4 b).

2. Marking device according to claim 1, characterized in that it further comprises a return spring (2), a first end of said return spring (2) being fixedly connected to said support (1) and a second end of said return spring (2) being connected to said first rod (7 b).

3. The label discharging device according to claim 2, wherein the first rod (7b) is provided with a strip-shaped hole along the length direction thereof, the second end of the return spring (2) is connected with a clamping rod, and the clamping rod is clamped in the strip-shaped hole and can slide to a set position along the strip-shaped hole to be fixed with the first rod.

4. Marking device according to claim 1, characterized in that a fixed pulley (3) is further arranged on the support (1), and the brake assembly (4) is sequentially wound around the first rotating shaft (5) and the fixed pulley (3).

5. Marking device according to claim 4, characterized in that said first lever (7b) is provided for connection to the second end of the brake assembly (4) in a position higher than the position of articulation of said first lever (7b) with the bracket (1).

6. Marking device according to claim 1, characterized in that said braking assembly (4) comprises a first section of braking band (4a), an elastic element (4b) and a second section of braking band (4c) connected in sequence.

7. Marking device according to claim 5 or 6, characterized in that the elastic member (4b) is a spring.

8. A label dispenser according to claim 1, further comprising at least one driven shaft (8) rotatably mounted on said holder (1), said free end of said roll of labels mounted on said first shaft (5) being able to pass around said driven shaft.

9. A labelling machine comprising a label dispenser according to any one of claims 1 to 8.