JPH0346392B2 - - Google Patents

Description

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

``Prior Art'' Conventionally, a dispenser is attached to the mouth 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 for distribution. I am able to send it to you.

Conventionally, when attaching the 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 relative to the container in the desired direction, and then the dispenser is left in that state. Once the main body of the dispenser is clamped, the 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. It is then screwed onto the container. (Unexamined Japanese Patent Publication 1986-
No. 127485).

The clamping roller is movably mounted on the capping head to clamp and open the cap, and the clamping roller is movably mounted on the capping head for rotationally driving the movable clamping roller. The rotating shafts of the rollers were interlocked with each other by an endless chain, and a chain tensioner was used to absorb the slack of the endless chain that occurred when the tightening rollers were clamped and released.

``Problems to be solved by the invention'' However, in general, chains tend to generate noise, and maintenance and inspection for elongation and lubrication are complicated.
Durability is also not sufficient.

"Means for Solving the 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, in the present invention, 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. The cap screwed onto the container includes 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 the capping head. A drive shaft that is pivotally supported on the chucking head, a pair of universal joints that connect the rotating shaft and the drive shaft, a spline shaft between them, a rotary drive means that rotationally drives the drive shaft, and a movable arm that moves the movable arm. and moving means for clamping and releasing the cap with the tightening roller.

"Operation" According to the above configuration, the clamping roller can be held and released by the universal joint and the spline shaft, and at the same time, the rotation by the rotational drive means is transmitted to the clamping roller. Furthermore, by using such a universal joint and spline shaft, noise generation can be reduced compared to the case where a chain is used, and maintenance and inspection can be made easier. Moreover, sufficient durability can be obtained.

"Example" The present invention will be described below with reference to the illustrated example.
In FIG. 1, a rotary capper 1 includes a supply star wheel 2 and a rotating body 3, which rotate synchronously.
and a discharge star wheel 4, and a container 5 transported by a conveyor (not shown).
(see FIG. 2) 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 6a of the dispenser 6 in a desired direction. It can be arranged. And the dispenser 6 with the nozzle 6a aligned in the 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 a desired direction, and is attached to the container 5 within the rotating body 3.

After this, 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 a container, and the dispenser 6 includes a main body 6c housing a pump 6b and a cap 6d rotatably provided on the main body 6c. The dispenser 6 is attached to the container 5 by screwing the cap 6d onto the upper end of the container 5.

The pump 6b housed in the main body 6c has a cylinder chamber 6e formed in the main body 6c, and a piston 6 slidably fitted in the cylinder chamber 6e.
f, a pump operating member 6g that is connected to the piston 6f to operate the pump 6b, and a pair of check valves 6 that are provided at the upper and lower positions of the cylinder chamber 6e and allow liquid to flow from below to above, respectively.
h, 6i, 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 6g against the spring 6j, the cylinder chamber 6e is lowered.
The liquid is supplied to the upper check valve 6h, this cylinder chamber 6, and the nozzle 6a provided in the pump operating member 6g.
The liquid in the container 5 is discharged to the outside through the discharge passage 6k that communicates with the container 5, and by raising the pump operating member 6g by the spring 6j, the liquid in the container 5 is discharged between the lower check valve 6i, the inside of the container 5, and the cylinder chamber. 6
The air can be sucked into the cylinder chamber 6e through a suction passage 6l that communicates with the cylinder chamber 6e.

Further, a male screw portion 6n is screwed at a position directly below the head 6m provided at the upper end of the pump operation member 6g, and a female screw portion (not shown) is screwed on the inner periphery of the upper part of the main body 6c fitted with the pump operation member 6g. 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. There is.

As shown in FIG. The supply chute 7 is arranged and fixed so as to face the rotary plate 11, and an arc-shaped guide member 12 is arranged and fixed along the outer periphery of the rotary plate 11. 11a and engaging portions 11b are formed alternately.

The outer periphery of the engaging portion 11b is connected to the guide member 12.
The pocket portion 11 is formed close to the pocket portion 11.
The distance between the inner circumferential portion of a and the guide member 12 is narrower than the diameter of the cap 6d of the dispenser 6,
and is set wider than the diameter of the main body 6c below the cap 6d, thereby making the pocket portion 11a
With the main body 6c of the dispenser 6 inserted between the inner circumference of the dispenser 6 and the guide member 12, a cap 6d is attached to both.
is placed and supported, and in this state, the dispenser 6 can be transported by the engaging portion 11b.

An arc-shaped friction pad 13 biased toward the center of the rotary plate 11 is provided at the front portion of the guide member 12 in the rotational direction, and the friction pad 13 is biased toward the center of the rotating plate 11.
By bringing the main body 6c of the dispenser 6 conveyed by the friction pad 13 into contact with the friction pad 13, the dispenser 6 can be rotated clockwise in FIG. 1 as it moves forward.

Further, a stopper member 14 is attached to each engaging portion 11b of the rotating plate 11, and when the dispenser 6 is rotated clockwise by the friction pad 13, the nozzle 6a of the dispenser 6 is stopped by the stopper member. 14, thereby making it possible to position the nozzle 6a in a desired direction.

The most advanced dispenser 6, which has been transported by its own weight inside the supply chute 7, has its main body 6c.
is in contact with the outer circumferential surface of the engaging portion 11b of the rotary plate 11 and is prevented from moving forward, and when the rotary plate 11 rotates and the engaging portion 11b passes, the dispensing device 6 at the most distal end touches the pocket portion 11a. It enters the interior by its own weight.

A stopper member made of a spring material (not shown) is provided on the side of the distal end of the supply chute 7, and the dispenser 6 that has entered the pocket portion 11a is prevented from rotating together with the rotary plate 11 by the stopper member. and stopped in 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 cap 6d of the dispenser 6 is supported by the guide member 12 and transported.

At this time, the dispenser 6 following the dispenser 6 pulled out from the supply chute 7 is placed on the rotary plate 1.
The forward movement is prevented by the first engaging portion 11b, and the subsequent rotation of the rotary plate 11 causes the next pocket portion 11 to move forward.
After being accommodated in a, it comes to be conveyed by the following engaging portion 11b.

When the main body 6c of the dispenser 6 conveyed by the engaging portion 11b comes into contact with the friction pad 13, the dispenser 6 is rotated clockwise in FIG. 1 by the frictional force, and the nozzle 6a of the dispenser 6
When the dispenser 6 comes into contact with the stopper member 14 provided on the rotary plate 11 and is positioned in a predetermined direction, in the illustrated embodiment, facing backward with respect to the conveyance direction, the dispenser 6 remains in that state from the supply means 8. It is transported to the delivery position to the rotating body 3.

In this embodiment, the nozzle 6a of the dispenser 6 is positioned by the supply means 8, but for example, the nozzle 6a of the dispenser 6 may be positioned in a predetermined direction depending on the shape of the dispenser 6, the nozzle 6a, etc. Of course, when the dispensers 6 can be aligned and supplied by the supply chute 7, the supply means 8 can be omitted and the supply chute 7 itself can be used as the means for supplying the dispensers 6.

Next, the rotating body 3 of the capper 1 holds the main body 6c of the dispenser 6 supplied by the supplying means 8 with the nozzle 6a directed in a desired direction, and the nozzle 6a is directed in the desired direction. Then, the dispenser 6 is taken out from the supply means 8.
A clamping means 18 is provided for receiving the rotor 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 in FIG.
The gears 21 are attached to rotating shafts 20 that are vertically supported, and the gears 21 attached to each rotating shaft 20 are meshed with each other. Therefore, when one rotating shaft 20 is rotated in one direction, the other rotating shaft 20 can be rotated in the opposite direction, thereby opening and closing the tips of both clamping arms 19. That's what I do.

A tension spring 22 is tensioned between one of the clamping arms 19 and the rotary body 3, and its tensile force biases the tips of both clamping arms 19 in a direction to close them, and the ends of the clamping arms 19 are attached to the other clamping arm 19. The cam follower 23 is brought into elastic contact with the outer peripheral surface of a fixed cam 24 fixed to the center of the rotating body 3, and the pair of clamping arms 19 can be opened and closed according to the cam curve of the fixed cam 24. I have to.

As shown in FIG. 1, the pair of clamping arms 1
The dispenser 9 is in an open state when approaching the supply means 8, so that the dispenser 6 conveyed by the supply means 8 is connected to the pair conveyed by the rotation of the rotating body 3. It comes to be inserted between the clamping arms 19 of. and dispenser 6
When it reaches the delivery position from the supply means 8 to the rotary body 3, the clamping arm 19 is closed by the fixed cam 24, and the main body 6c is located below the cap 6d.
while holding the dispenser 6 between the supply means 8 and the rotating body 3 with the nozzle 6a facing backward in the conveyance direction.
accept within.

However, as shown by the imaginary lines in FIG. 4, the rotating body 3 has a
Each is provided with a capping head 28 for receiving the dispenser 6 from the clamping means 18 and screwing its cap 6d onto the upper end of the container 5.

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 possible to move up and down as the rotating body 3 rotates.

At the bottom of the capping head 28, a fifth
As shown in FIG. 6, an engaging member 29 that engages with the head 6m and nozzle 6a of the dispenser 6 to hold the nozzle 6a in a fixed direction, and a cap 6d of the dispenser 6. A gripping means 30 for gripping the upper main body 6c, and a total of four tightening rollers 31 that are pressed against the outer peripheral surface of the cap 6d to rotate the cap 6d.
(See Figure 8).

The engaging portion 29 is constituted by an inverted cup-shaped member with an open bottom, and a notch 29a (FIG. 6) into which the nozzle 6a is inserted is formed on the lower outer periphery of the engaging portion 29. When the head 6m of the dispenser 6 is housed inside, 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 (first and second engaging members 33) pivotally supported by a pin 32 at the lower part of the capping head 28. 8
(see figure), a spring 34 that is elastically loaded between each engaging member 33 and the capping head 28 to expand the lower end of each engaging member 33, and The cam follower 35 is provided at the upper end of the member 33, and each cam follower 35 is connected to a cam 37 which is moved up and down by an air cylinder 36 attached to the shaft of the capping head 28, and the spring 34 is applied to the cam 37. They are in elastic contact due to repulsive force.

The cam 37 is normally positioned at the raised end shown on the right side of the center line in FIG. It is in an open state. On the other hand, as shown on the left side of the center line in FIG. 5, when the cam 37 is lowered by the air cylinder 36, the lower end of each engaging member 33 is closed, and the lower end Therefore, the above dispenser 6
The main body 6c can be grasped from both sides.

Furthermore, a total of 4 rotations are made to rotate the cap 6d.
The two tightening rollers 31 are made of a material with a large coefficient of friction such as rubber, and each of the two tightening rollers 31 has a rotary shaft 41 to which each tightening roller 31 is attached is pivotally supported at the lower end of a pair of movable arms 42. The tightening rollers 31 are one set, and each set is one movable arm 42.
It is designed to be pivoted at the lower end of the.

The upper part of each of the movable arms 42 is swingably attached to the capping head 28 by a pin 43, and like the pair of engaging members 33 of the gripping means 30, a cam 45 is linked to an air cylinder 44. When the movable arm 4 is positioned at the rising end shown on the right side of the center line in FIG.
The lower end of 2 is expanded.

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. The tightening rollers 31 provided at the lower end of the arm 42 are 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 for rotating the clamping rollers 31 in the same direction to rotate the clamped cap 6d is connected to the capping head 2.
8, and a gear 53 is attached to the drive shaft 52 of the torque motor 51. As shown in FIG. 7, this gear 53 is meshed with four gears 54 provided around it.
are respectively attached to drive shafts 55 rotatably supported by the capping head 28.

The four drive shafts 55 and each tightening roller 3
The rotary shafts 41 to which 1 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.

Therefore, when each drive shaft 55 is rotationally driven by the torque motor 51, the rotation of the drive shaft 55 is transmitted to the tightening roller via the universal joint 56, the spline shaft 57, and the rotation shaft 41. 31 and even if the movable arm 42 swings, the universal joint 56 and the spline shaft 57 allow the rotation to be transmitted while allowing the swing.

Furthermore, as shown in FIG. 4, the rotary body 3 has a clamping means 18 located below the holding means 18 for receiving the dispenser 6 from the supply means 8 described above into the rotary body 3.
Guide means 61 for guiding the lower end of the dispenser 6 to ensure that the lower end is inserted into the container 5
has been established. This guide means 61 has a pair of arms 62, respectively, as shown in the lower half of FIG.
and a guide cone 63 formed by dividing a cylindrical member into two, attached to the tip of each arm 62, and when both arms 62 are closed and each guide cone 63 is butted, the Guide cone 6
3 to form 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 the clamping arm 19 of the clamping means 18 described above, and has the same or equivalent portion as the clamping means 18. are indicated by the same reference numerals with '' appended to them.

In the above configuration, the pair of clamping arms 19 of the clamping unit 18 hold the dispenser 6 whose nozzle 6a is directed in a desired direction by the supply unit 8.
When the dispenser 6 is received into the rotating body 3 from the supply means 8 while keeping the direction of the nozzle 6a in the desired direction, the capping head 28 rises as shown in FIG. 14B. Each pair of engaging members 33 and movable arms 42 of the capping head 28 are open.

When the clamping means 18 pulls out the dispenser 6 from the supply means 8, the capping head 28
is lowered and the head 6 of the dispenser 6 is first inserted into the engaging member 29 provided at the lower part of the capping head 28.
At the same time, the nozzle 6a is engaged with a notch 29a formed in the engagement member 29, so that the nozzle 6a does not rotate relative to the engagement member 29.

Next, the air cylinders 36 and 44 are actuated to lower the cams 37 and 45, respectively, thereby closing the lower ends of each pair of engagement members 33 and movable arm 42. The lower end of the engaging member 33 is located above the main body 6c of the dispenser 6 than the cap 6d.
The four tightening rollers 31 provided at the lower end of the movable arm 42 grip the cap 6d (Fig. 13c).

When the dispenser 6 is held by the pair of engaging members 33 and the movable arm 42, the clamping means 1
The pair of clamping arms 19 of 8 release the grip of the dispenser 6 (FIG. 13d), and at the same time, the two-split guide cone 63 provided at the tip of the pair of arms 62 of the guide means 61 is closed. A cylindrical guide surface is formed which is narrowed at the bottom (FIG. 13e).

In this state, the capping head 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 63 is opened by the pair of arms 62 (FIG. 13f), and the capping head 28 is subsequently lowered to open the cap 6d of the dispenser 6. is fitted into the upper end opening of the container 5.

When the cap 6d of the dispenser 6 is fitted into the container 5, the torque motor 51 is started and the cap 6d is rotated by the tightening roller 31, so that the cap 6d is attached to the upper end of the container 5. When the cap 6d is fitted, the cap 6d is screwed onto the upper end opening of the container 5. When the torque motor 51 tightens the cap 6d to the container 5 with a predetermined tightening torque and stops rotating, the operation of the torque motor 51 is stopped (Fig. 13g).

The above operation completes the work of attaching the dispenser 6 to the container 5. In this embodiment, the main body 6c of the dispenser 6, which is fixed by the engagement member 33, is then engaged. A head 6m that rotates and biases the member 29 and fits therein.
is rotated in the tightening direction of the male threaded portion 6n,
When the head 6m rotates, its male threaded portion 6n is loosened, so this state can be detected.

That is, in FIGS. 9 to 12, an engaging 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. The sector gear 6 is attached to the gear 67 formed on a part of the outer peripheral surface of the gear 29.
8 are engaged. This sector gear 68 is attached to a rotating shaft 69 that is supported by the capping head 28, and this rotating shaft 69 is connected to a pair of universal joints 70 and a spline shaft 71 between them.
The capping head 28 is connected to a rotating shaft 72 which is rotatably supported on the upper part of the capping head 28.

A slack detection arm 73 is attached to the upper part of the rotation shaft 72.
and an operating lever 74, one of the slack detection arms 73 is fixed to the rotating shaft 72, while the other operating lever 74 is rotatably attached. The operating lever 74 is rotated clockwise by a tension spring 75 stretched between it and the capping head 28, and the operating lever 74 is rotated clockwise by a pin 76 provided on the detection arm 73.
The detection arm 73 and the operating lever 74 are rotated clockwise by bringing the detection arm 73 into contact with a stopper 77 provided on the capping head 28.
and are held in the inoperative position shown.

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 6a positioned in the normal direction and hold it in that position.

Furthermore, a pin 81 provided on the operating lever 74
A tension spring 82 is tensioned between the pin 76 provided on the detection arm 73, and when the operating lever 74 is rotated counterclockwise from the non-operating position shown in the figure,
The detection arm 73 can be biased counterclockwise via the tension spring 82, and the head 6m of the dispenser 6 can be biased to rotate in the tightening direction relative to the main body 6c via the engagement member 29. I have to.

A cam follower 83 made of a ball is provided at the tip of the operating lever 74, and this cam follower 83 is engaged with a fixed cam 84 which is disposed and fixed at a position in front of the discharge star wheel 4 shown in FIG. The operating lever 74 can be rotated counterclockwise by a required amount from the non-operating position.

Further, the capping head 28 is provided with a nearby switch 85 for detecting the tip of the detection arm 73 located in the non-operating position. This proximity switch 85 is connected to a control device (not shown), and the detection arm 73 is connected to the stopper 77.
If the actuator is rotated counterclockwise by more than a required amount from the non-operating position where it abuts, the control device can detect this.

Note that the above-mentioned nearby switch 85 may be provided anywhere as long as it can detect that the engaging member 29 has rotated, and as long as that purpose can be achieved. Further, the detection arm 73 serves as a rotation means for rotationally biasing the engagement member 29 in the tightening direction of the threaded portion.
Instead of providing the operating lever 74, a torque motor may be provided.

Next, the operation of detecting slack in 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 comes into contact with the fixed cam 84, and the operating lever 74 comes into contact with the fixed cam 84.
4 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 6 m of the dispenser 6 is urged to rotate in the tightening direction with respect to the main body 6 c via the engaging member 29 that is interlocked with the detection arm 73 .

At this time, if the male screw 6n of the dispenser 6 is securely tightened into the female screw part, the head 6m will not rotate. 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 transferred to the capping head 2.
After being separated from 8, it is carried out to the outside via the discharge star wheel 4.

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

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 thereto. Of course, the dispenser can be used by activating the dispenser to cause liquid to be ejected from the nozzle. When such a dispenser is used, 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 6c of the dispenser 6 can be omitted. Of course.

"Effects of the Invention" As described above, according to the present invention, the clamping roller can be clamped and released by the universal joint and the spline shaft, and rotation by a rotational drive means such as a torque motor can be controlled. The noise can be transmitted to the tightening roller, and by using the universal joint and spline shaft, noise generation can be reduced compared to when using a chain, 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 is a cross-sectional view showing the clamping means 18 in the upper half and the guide means 61 in the lower half. , FIG. 4 is a longitudinal sectional view of the rotating body 3 shown in FIG. 1, FIG. 5 is an enlarged sectional view of the capping head 28, FIG. 6 is a side view of FIG. 5, and FIG. 8 is a sectional view taken along the - line of FIG. 5.
9 is a sectional view of the capping head 28 at a different part from FIG.
0 is a side view of FIG. 9, FIG. 11 is a plan view of FIG. 9, FIG. 12 is a schematic sectional view taken along the - line of FIG. It is an operation process diagram for attaching. 1...Rotary cap, 3...Rotating body, 5...
Container, 6... Dispenser, 6a... Nozzle, 6
b... 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), 56...Universal joint, 57...Spline shaft.

Claims (1)

[Claims] 1. 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. a cap that is screwed onto a container, a plurality of movable arms movably attached to the capping head, a rotating shaft pivotally supported by each movable arm, and the tightening roller provided on each rotating shaft; a drive shaft pivotally supported on the capping head; 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. A driving device for a tightening roller in a cap, comprising a moving means for moving the cap to clamp and release the cap with the tightening roller.