JPS6367292A - Drive for clamping roller in capper - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a capper, and more particularly to a capper for attaching a dispenser to a container.

``Prior Art'' Conventionally, a dispenser is attached to a part of a container, and a pump housed in the main body of the dispenser is operated by a pump operating member to discharge the liquid in the container to the outside from a nozzle and dispense the liquid. I am able to send it to you.

Conventionally, when attaching the above-mentioned dispenser to a container, the dispenser is first inserted into the container, then the dispenser is rotated relative to the container to orient the nozzle in the desired direction relative to the container, and then the dispenser is left in that state. Once the entire body of the dispenser is clamped, the cap rotatably provided on the body of the dispenser is clamped by a plurality of tightening rollers movably disposed near the capping head.
The above-mentioned cap is rotated by the rotation of an attached roller, and is screwed onto the container.
No. 5).

The tightening roller is provided in a movable manner on the capping head in order to clamp and release the cap, and furthermore, in order to rotationally drive the tightening roller that can move, the tightening roller is moved. The rotating shaft is interlocked with an endless chain, and a chain tensioner absorbs the slack of the endless chain 7 due to the clamping and releasing of the tightening roller.

``Problems to be Solved by the Invention'' However, in general, chenos tend to generate noise, require complicated maintenance and inspection for elongation and lubrication, and are not sufficiently durable.

7 Stages for Solving Problems" In view of such circumstances, the present invention utilizes a universal joint and a spline shaft in the drive system of the tightening roller.

That is, the present invention provides a cap that is rotatably provided on the main body of a dispenser. T-A capper which is clamped by a plurality of tightening rollers movably provided on the capping head, and which rotates the cap by rotation of the tightening rollers and screws it onto the container, the capper being movable to the capping radially. 8I installed on
A number of movable arms, a rotating shaft supported by each movable arm,
The tightening roller provided on each rotating shaft, the driving shaft supported by the capping head, a pair of universal joints connecting the rotating shaft and the driving shaft, and the spline shaft between them, which rotates the driving shaft. a rotational drive means for driving;
and a moving stage for moving the movable arm to clamp and release the cap between the tightening rollers.

"Operation" According to the above configuration, the universal joint and the spline shaft allow the clamping and releasing operations of the tightening roller, and at the same time, the rotation by the rotary drive means is transmitted to the tightening roller. Furthermore, by using such a universal joint and spline shaft, noise generation can be reduced compared to using a chino, and maintenance and inspection can be made easier. Moreover, sufficient durability can be obtained.

``Embodiment'' The present invention will be described below with reference to an illustrated embodiment. In FIG. 1, a rotary capper 1 is provided with a supply star wheel 21, a rotating body 3, and a discharge star wheel 4, which rotate synchronously, and which are not shown in the drawings. The container 5 (see FIG. 2) conveyed by the conveyor is supplied into the rotating body 3 of the capper 1 via the supply star wheel 2.

On the other hand, the dispenser 6 attached to the container 5 is supplied from a supply chute 7 to a supply means 8 integrally provided on the upper part of the supply star wheel 2, and this supply means 8 directs the nozzle 68 of the dispenser 6 in a desired direction. It can be arranged. Then, the dispenser 6 with the nozzle 68 aligned in a required direction is supplied into the rotating body 3 of the capper 1 at a position directly above the container 5 with the nozzle 6a aligned in the required direction, and the container 5 is placed inside the rotating body 3. mounted on.

Thereafter, the container 5 with the dispenser 6 attached is discharged from the capper 1 to the outside by the discharge star wheel 4.

FIG. 2 shows the dispenser 6 attached to the container 5, and the dispenser 6 includes a main body 6c housing a pump 6b, and a cap 6d rotatably provided on the main body 6c. ” - Put the cap 6d into the container 5.
The dispenser 6 is attached to the container 5 by screwing onto the upper end opening of the container 5.

”-The pump 6b housed in the main body BC is
Cylinder chamber 6e formed in C and this cylinder chamber 6e
A piston 6f is slidably fitted in the cylinder chamber 6e, a pump operating member 8g is connected to the piston 6f to operate the pump 6b, and a pump operating member 8g is provided at the upper and lower positions of the cylinder chamber 6e to direct liquid from below to above. It is equipped with a pair of reverse valves 6h and 61 that allow circulation, and the pump operating member 6
The spring 6j housed in the cylinder chamber 6e normally positions the spring 6g at a rising end position projecting upward from the main body 6c.

By lowering the pump operating member 8g against the spring 6j, the liquid in the cylinder chamber 6e is drained through the upper check valve 6h and the nozzle 6a provided in the cylinder chamber 8e and the pump operating member 6g. Communicating sliding discharge passage 6
The container 5
The liquid inside is transferred to the cylinder chamber 6 through a lower check valve 61 and a suction passage 61 that communicates the inside of the container 5 with the cylinder chamber 6e.
It is designed so that it can be sucked into the e.

Further, a male threaded portion 6n is provided at a position directly below the head 811 provided at the upper end of the pump operating member θg, and a female threaded portion (not shown) is provided on the inner periphery of the upper part of the main body 6c into which the pump operating member 6g is fitted. The pump operating member 6g is pushed into the main body 6c against the spring 6j, the male threaded portion 6n is screwed into the female threaded portion, and the dispenser 6 in this state is attached to the container 5. ing.

Next, as shown in FIG.
The supply means 8, which is integrally provided on the upper part of the supply star wheel 2, includes a rotating plate 11 that rotates together with the supply star wheel 2,
the supply chute 7 arranged and fixed toward the center of the supply chute 1;
The rotary plate 11 is provided with an arcuate guide member 12 arranged and fixed along the outer periphery of the rotary plate 11, and a plurality of pocket portions 11a and engaging portions flb are alternately formed on the outer periphery of the rotary plate 11. ing.

The outer periphery of the engaging portion 11b is formed close to the guide member 12, and the distance of 1 m between the inner periphery of the blurred portion 11a and the guide member 12 is smaller than the diameter of the cap 6d of the dispenser 6. is narrower and wider than the diameter of the main body Be below the cap 6d, so that when the main body Bc of the dispenser 6 is inserted between the inner peripheral part of the pocket part 11a and the guide member 12, the cap cd is set between both. is placed and supported, and in that state, the above-mentioned engaging portion 1
1b allows the dispenser 6 to be transported.

At the front part of the guide member 12 in the rotational direction, an arc-shaped friction pad 13 biased toward the center of the rotary plate 11 is provided.
By bringing the main body 6c of the dispenser 6 conveyed by the retaining portion 11b into contact with the friction pad 13, the dispenser 6 is moved forward to the first position.
It can be rotated clockwise in the figure.

Further, a stopper member 14 is attached to each engaging portion 11b of the rotary plate 11, and when the dispenser 6 is rotated clockwise by the friction pad 13, the nozzle 6a of the dispenser 6 is attached to the stopper member 14. This allows the nozzle 6a to be positioned in a desired direction.

The most advanced dispenser 6, which has been conveyed through the supply chute 7 by its own weight, has its main body 6c in contact with the outer circumferential surface of the retaining portion 11b of the rotary plate 11, and its forward movement is stopped. When the engaging portion 11b rotates and the engaging portion 11b passes, the most distal end of the dispenser 6 enters the pocket portion 1a by its own weight.

A stopper member made of a spring material (not shown) is provided on the side of the tip of the supply chute 7, and the pocket portion 1
The dispenser 6 that has entered the interior a is prevented from rotating together with the rotary plate 11 by the stopper member, and is stopped at that position. When the engaging portion 11b of the rotary plate 11 comes into contact with the dispenser 6, the engaging portion 11b forcibly advances the dispenser 6 beyond the stopper member and engages the inner peripheral portion of the pocket portion 11a of the rotary plate 11. The dispenser 6 is transported with the cap 6d of the dispenser 6 supported by the guide member 12.

At this time, the dispenser 6 pulled out from the supply chute 7
The dispenser 6 connected to the engaging portion 1 of the rotary plate 11
1b prevents the sheet from moving forward, and by the continued rotation of the rotating plate 11, the sheet is accommodated in the next pocket section 11a, and then conveyed by the following holding section ub.

When the main body 6c of the dispenser 6 conveyed by the engaging portion 11b contacts the friction pad 13, the dispenser 6 is rotated clockwise in FIG. When the dispenser 6 comes into contact with the stopper member 14 and is positioned in a predetermined direction (in the illustrated embodiment, facing backward with respect to the conveyance direction), the dispenser 6 is moved from the supply means 8 to the rotating body 3 in that state. transported.

In addition, in this embodiment, the dispenser 6 is supplied by the supply means 8.
However, when the nozzle 6a of the dispenser 6 is positioned in advance in a predetermined direction depending on the shape of the dispenser 6, the nozzle 6a, etc., and the dispenser 6 can be aligned and fed by the supply chute 7, the above method is used. Of course, the supply means 8 can be omitted and the supply chute 7 itself can be used as the supply means for the dispenser 6.

Next, the rotating body 3 of the capper 1 is provided with the supply means 8.
The main body 6C of the dispenser 6 supplied with the nozzle 8a facing the required direction is held between the nozzles 6a and 6C.
A clamping means 18 is provided for taking out the supplying means 8 with the dispenser 6 facing in a desired direction and receiving the dispenser 6 into the rotating body 3.

A plurality of clamping means 18 are provided at equal intervals on the outer periphery of the rotating body 3, and each clamping means 18 is provided with a pair of clamping arms 19 for clamping the main body 6C of the dispenser 6.

As shown in the upper half of the center line of FIG. The attached gears 21 are meshed with each other.

Therefore, when one rotation shaft 20 is rotated in one direction, the other rotation shaft 20 can be rotated in the opposite direction, thereby making it possible to open and close the tips of both clamping arms 18. .

A tension spring 22 is tensioned between one of the clamping arms 19 and the rotating body 3, and the tensile force of the tension spring causes both clamping arms IS to
At the same time, the cam follower 23 attached to the other clamping arm 18 is brought into elastic contact with the outer surface of a fixed cam 24 fixed to the center of the rotating body 3. The pair of clamping arms 18 can be opened and closed according to the cam curve.

As shown in FIG. 1, the pair of clamping arms 19 are in an open state when approaching the supply means 8,
Therefore, the dispenser 6 transported by the supply means 8 is inserted between the pair of clamping arms 19 transported by the rotation of the rotating body 3. When the dispenser 6 is at the delivery position from the supply means 8 to the rotating body 3, the clamping arm 19 is closed by the fixed cam 24, clamping the main body 8C below the cap 6d, and moving the nozzle 6a backward in the conveying direction. The dispenser 6 is received from the supply means 8 into the rotating body 3 while being oriented.

As shown by the imaginary lines in FIG. 4, the rotating body 3 has a position above each of the clamping means 18 to receive the dispenser 6 from the clamping means 18 and attach the cap 8d to the upper end of the container 5. A capping head 28 is provided, which is screwed onto the capping head 28.

Each capping head 28 is attached to the rotating body 3 so as to be able to move up and down, and by engaging a cam follower (not shown) provided on the capping head 28 with a fixed cam provided above the shaft portion of the rotating body 3, It is designed to be able to rise and fall as the number 3 rotates.

At the bottom of the capping head 28, there are
As shown in the figure, the main body above the cap 6d of the dispenser 6 includes a retaining member 29 that engages with the head 8m of the dispenser 6 and the nozzle 6a to hold the nozzle Eia in a certain direction. 6c, and a total of four tightening rollers 31 (see FIG. 8) that are pressed against the outer peripheral surface of the cap 6d to rotate the cap 6d.

The engaging member 28 is composed of an inverted cup-shaped member with an open bottom, and a notch 29a (FIG. 6) into which the nozzle 6a is inserted is formed outside the F portion of the engaging member 28. When the head 6ffi of the dispenser 6 is housed in the notch 29, the nozzle 6a is engaged with the notch 29a to prevent the nozzle 6a from rotating relative to the engagement member 29.

Furthermore, the gripping means 30 for gripping the main body 6c above the cap 6d of the dispenser 6 includes a pair of engaging members 33 (see FIG. ) and each engaging member 33
and the capping head 28 to expand the lower end of each engaging member 33;
A cam follower 35 is provided at the upper end of each engaging member 33 at a higher position, and each cam follower 35
The spring 3 is attached to a cam 37 that is raised and lowered by an air cylinder 3B attached to the shaft of the capping head 28.
Thanks to the repulsive force of 4! ! are in contact with each other.

The cam 37 is normally moved to the fifth position by the air cylinder 3B.
It is located at the rising end shown on the right side of the center line in the figure, and in this state, the lower end portion of each engaging member 33 is expanded by the spring 34. On the other hand, when the cam 37 is lowered by the air cylinder 36, as shown on the left side of the center line in FIG. 6
The main body θC can be grasped from both sides.

Furthermore, a total of four tightening rollers 31 for rotating the cap 6d are made of a material with a large friction coefficient such as rubber, and a rotating shaft 41 to which each tightening roller 31 is attached is connected to the lower end of a pair of movable arms 42. Each set of two tightening rollers 31 is pivotally supported at the lower end of one movable arm 42.

The upper part of each movable arm 42 is swingably attached to the capping head 28 by a pin 43, and similarly to the pair of engaging members 33 of the gripping means 30, a cam 45 interlocked with an air cylinder 44 is connected to the upper part of each movable arm 42. When positioned at the rising end shown on the right side of the center line in FIG. 5, the lower end of each movable arm 42 is expanded by a spring 46.

On the other hand, when the cam 45 is lowered by the air cylinder 44, as shown on the left side of the center line in FIG. Tightening roller 3 provided at the lower end of
1 is closed so that the cap 6d of the dispenser 6 can be clamped by a total of four tightening rollers 31 (see FIG. 8).

Next, a torque motor 51 is provided on the upper part of the capping head 28 to drive each of the tightening rollers 31 in the same direction to rotate the clamped cap 6d. Gear 53 is installed. As shown in FIG. 7, this gear 53 is meshed with four gears 54 provided around it, and each gear 54 is attached to a drive shaft 55 rotatably supported on the capping head 28. There is.

The four drive shafts 55 and the rotating shaft 41 to which each tightening roller 31 is attached are connected to each other via a pair of universal joints 56 and a spline shaft 57 that connects each universal joint 56. I'm letting you do it.

Therefore, each drive shaft 55 is connected to the torque motor 51.
When the drive shaft 55 is rotationally driven by , the universal joint 5B and the spline shaft 57 allow rotation to be transmitted while allowing rocking thereof.

Further, as shown in FIG. 4, the rotary body 3 is provided with a lower end of the dispenser 6 in the container 5 at a position below the holding means 18 that receives the dispenser 6 from the supply means 8 described above into the rotary body 3. A guide means 61 is provided for guiding the lower end thereof so that it can be inserted into. This guide means 81 is
As shown in the lower half of FIG.
2, and a guide cone 63 formed by dividing a cylindrical member into two, which is attached to the tip of each arm 62.
When both arms 62 are closed and each guide cone B3 is butted against each other, the guide cone 63 forms a cylindrical guide surface that is narrowed at the bottom.

The structure for opening and closing each arm 62 of the guide means 61 is substantially the same as the structure for opening and closing each clamping arm 19 of the clamping means 18 described above, and is the same as that of the clamping means 1B. Or corresponding parts are given the same reference numerals.
It is shown with .

In the above configuration, the nozzle 6 is
The pair of clamping arms 19 of the clamping means 18 clamp the dispenser 6 with the direction of a pointing in the desired direction, and insert the dispenser 6 into the rotating body 3 from the supplying means 8 while keeping the direction of the nozzle 6a in the required direction. When received, as shown in FIG. 14B, the capping head 2B is located at the rising end, and each pair of engagement member 33 and movable arm 42 of the capping head 28 are opened.

When the holding means 18 pulls out the dispenser 6 from the supply means 8, the capping head 28 descends and first stores the head 8m of the dispenser 6 in a retaining member 29 provided at the lower part of the capping head 28. At the same time, the nozzle 8a is engaged with the notch 28a formed in the engagement member 23 to prevent the nozzle 6a from rotating relative to the engagement member 29.

Air cylinders 38.44 are then actuated to lower respective cams 37.45, thereby closing the lower ends of each pair of engagement members 33 and movable arms 42. The lower end of the engaging member 33 clamps the main body 6C above the cap 8d of the dispenser 6, and the four tightening rollers 31 provided at the lower end of the movable arm 42 clamp the cap 6d (Fig. 13c). .

When the dispenser 6 is held by the pair of engaging members 33 and the movable arm 42, the pair of clamping arms 19 of the clamping means 18 release the clamping of the dispenser 6 by the first
3d), and at the same time the pair of arms 6 of the guide means 61
The two-split guide cone 63 provided at the tip of the guide cone 63 is closed to form a cylindrical guide surface narrowed at the bottom (FIG. 13e).

In this state, the cap 28 is lowered to lower the dispenser 6 held thereby, and the lower end of the dispenser 6 is reliably guided into the container 5 by the guide cone 63.

When the lower end of the dispenser 6 is inserted into the container 5, the guide cone 83 is opened by the pair of arms 62 (FIG. 13f), and the capping head 2
8 is lowered and the cap 6d of the dispenser 6 is placed in the container 5.
Fit it into the upper end opening of.

When the cap 6d of the dispenser 6 is fitted into the container 5, the torque motor 51 is started and the tightening roller 3
1, and when the cap 6d is fitted to the upper end of the container 5, the cap 6d is screwed onto the upper end of the container 5. When the torque motor 51 tightens the cap 8d to the container 5 with a predetermined tightening torque and stops rotating, the operation of the torque motor 51 is stopped (Fig. 13g).

With the above operations, the work of attaching the dispenser 6 to the container 'A5 is completed, but on the Kinomio side, after this, the dispenser 6 fixed by the engagement member 33 is
The retaining member 29 is rotationally biased against the main body Bc, and the head 6m fitted thereon is rotationally biased in the tightening direction of the male threaded portion 6n, and when the head 8m rotates, the Since the male threaded portion 8n is loosened, this state can be detected.

That is, in FIGS. 9 to 12, the retaining member 29 into which the head 6m of the dispenser 6 is fitted is rotatably attached to the lower end of the capping head 28, and the engaging member 2B is A sector gear 88 is meshed with a gear 67 formed on a part of the outer peripheral surface. This sector gear 68 is attached to a rotary shaft 69 which is pivotally supported on the capping head 28, and this rotary shaft 68 is a rotary shaft which is pivotally supported on the upper part of the capping head 28 by a pair of universal joints 70 and a spline shaft 71 between them. 7
It is connected to 2.

A slack detection arm 73 and an actuation lever 74 are provided on the upper part of the rotation shaft 72. One of the slack detection arms 73 is fixed to the rotation shaft 72, while the other operation lever 74 is fixed to the rotation shaft 72.
4 is rotatably attached. And the above operating lever 7
4 is rotated clockwise by a tension spring 75 stretched between the capping head 28 and the capping head 28, and the operating lever 74 is rotated clockwise by a tension spring 75 stretched between the capping head 28 and the capping head 28.
6 and rotate the detection arm 73 in the forward direction.
The detection arm 73 and the actuation lever 74 are held in the non-operation position shown in the figure by making them come into contact with a stopper 77 provided in the figure.

In this non-operating state, the notch 29a of the engaging member 29 that is interlocked with the detection arm 73 can engage the nozzle 8a positioned in the normal direction and hold it in that position.

Furthermore, a tension spring 82 is provided between the pin 81 provided on the operating lever 74 and the pin 7B provided on the detection arm 73, so that the operating lever 74 is rotated counterclockwise from the non-operating position shown in the figure. At this time, the detection arm 73 is moved counterclockwise via the tension spring 82, and thus the engagement member 29
The head 611 of the dispenser 6 can be biased to rotate in the tightening direction with respect to the main body 6c.

A cam follower 83 made of a pole is provided at the tip of the operating lever 74, and this cam follower 83 is connected to the first
By engaging a fixed cam 84 arranged and fixed at a position in front of the discharge star wheel 4 shown in the figure, the above-mentioned operating lever ? 4 can be rotated counterclockwise by a required amount from the non-operating position.

Further, the capping head 28 is provided with a proximity switch 85 that detects the tip of the detection arm 73 located in the non-operating position. This proximity switch 85 is connected to a control attachment (not shown), and when the detection arm 73 is rotated counterclockwise by more than a required amount from the non-operating position where it contacts the stator bar 77, it It can be detected by the control equipment.

The proximity switch 85 may be provided anywhere as long as it can detect that the engagement member 23 has rotated, and it may be provided anywhere as long as the purpose is achieved. As a rotating means for rotating,
Instead of providing the detection arm 73 and the actuation lever 74,
A torque motor may also be provided.

Next, the operation of detecting the loosening of the male threaded portion 6n will be explained. After the dispenser 6 is attached to the container 5, the cam follower 83 of the operating lever 74 is moved to the fixed cam 8.
4, and the operating lever 74 is rotated counterclockwise against the tension spring 75. As a result, the detection arm 73 is urged to rotate counterclockwise via the tension spring 82, and the head 8m of the dispenser 6 is tightened against the main body 8c via the engagement member 29 interlocked with the detection arm 73. Rotationally biased in the direction of rotation.

At this time, if the male threaded part θn of the dispenser 6 is securely tightened into the female threaded part, the head 8m will not rotate, and if the container 5 is normal, and if there is any slack, the degree of slack is small. Any container that is not detected by the proximity switch 85 even if the detection arm 73 rotates slightly counterclockwise is treated as a normal container and is removed from the capping head 28 and then transported to the outside via the discharge star wheel 4. It will be transported to

On the other hand, the degree of loosening of the male threaded portion 6n is large,
When the detection arm 73 rotates counterclockwise by more than the required amount, the control device detects this state using the proximity switch 85, and removes the defective container from the normal container processing line by a reject mechanism (not shown) provided downstream. It starts to be discharged to the outside.

In the above embodiment, the nozzle 6a of the dispenser 6 is a separate member from the main body 6c, but the present invention is not limited to this. For example, the nozzle may be provided integrally with the main body,
Of course, it is possible to use a dispenser in which a pump actuating member provided on the body is actuated to cause liquid to be ejected from a nozzle. When using such a dispenser, it is possible to omit either the engaging member 29 that engages with the nozzle 6a or the engaging member 33 of the gripping means 30 that engages with the main body 8c of the dispenser 6. Of course.

"Effects of the Invention" As described above, according to the present invention, the universal joint and the spline shaft allow the clamping and releasing operations of the tightening roller, and the rotation by the rotation drive means such as the torque motor is prevented. By using the universal joint and the spline shaft, noise generation can be reduced compared to the case where a checker 7 is used, and maintenance and inspection can be made easier. It is possible to obtain the effect that sufficient durability can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing an embodiment of the present invention, FIG. 2 is a side view of the container 5, and FIG. 3 shows a clamping means 18 in the upper half.
4 is a longitudinal sectional view of the rotary body 3 shown in FIG. 1, FIG. 5 is an enlarged sectional view of the capping head 2B, and FIG. 6 is a side view of FIG. 5. Figure 7 is a sectional view taken along the line ■-■ in Figure 5, and Figure 8 is a cross-sectional view along the line ■ in Figure 5.
A schematic cross-sectional view taken along line -■, FIG. 9 is a cross-sectional view of the capping head 28 at a different part from FIG. 5, FIG. 10 is a side view of FIG. 9, and FIG. 11 is a plan view of FIG. 9. , FIG. 12 is a schematic sectional view taken along line 1--X[[ of FIG. 9, and FIGS. 13a to 13g are operation process diagrams for attaching the dispenser 6 to the container. l...Rotary capper 3...Rotating body 5...Container 6...Dispenser 6a...Nozzle
6b...Pump 6c...Main body
6d... Cap 6g... Pump operating member 8...
- Supply means 28... Capping head 41... Rotating shaft 42... Movable arm 44
... Air cylinder (moving means) 45 ... Cam 52 ... Drive shaft 51 ...
・Torque motor (rotation drive means) 5B... Universal joint 57... Spline shaft No. 2 Figure 29a

Claims (1)

[Claims] A cap rotatably provided on the main body of the dispenser is held between a plurality of tightening rollers movably provided on the capping head, and the cap is rotated by the rotation of the tightening rollers, and the cap is attached to the container. In the capper screwed onto the capper, a plurality of movable arms movably attached to the capping head, a rotating shaft supported by each movable arm, the tightening roller provided on each rotating shaft, and a shaft mounted to the capping head. A supported drive shaft, a pair of universal joints connecting the rotary shaft and the drive shaft, a spline shaft therebetween, a rotary drive means for rotationally driving the drive shaft, and a movable arm that moves the tightening roller. A driving device for a tightening roller in a capper, comprising a moving means for holding and opening a cap.