JPH06183486A - Cap-sealing head - Google Patents

Abstract

PURPOSE:To contrive the reduction of a cost and to obtain a sealing head, which can correspond to the variation of the mouth and neck of a container, by simplifying the structure of the turned fastening mechanism of a cap put on the container. CONSTITUTION:The title cap-sealing head has a sealing-head support means 4 supported by an ascendable support structure 2 and a cap presser foot 75 at the lower end of a center shaft 61 being in a relatively rotation-stopped state and the support means 4 lowers. Then, after the cap presser foot 75 pushes an unfastened cap put on a container, the cam part 45b of a cylindrical cam 45 in a rotating state lowers by a lowering stroke following the action of the presser foot to push a roller 51 on a plate spring lever 81 rotating but not lowering so that a thread roller 93 and skirt roller 95 connected with the lower end of the lever 81 are moved inward to conduct turned fastening of the cap. The plate spring lever 81 has a flexibility in the direction of movement so as to be capable of corresponding to the dimensional error of the mouth and neck of the container and also to be simple in structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap for forming a screw cap from a cup-shaped material made of a metal plate such as an aluminum plate covered with a container having a screw groove on the upper outer peripheral surface and for tightening the cup at the container mouth. It concerns a sealing head.

[0002]

2. Description of the Related Art Conventionally, a cap sealer having a supporting body, a sealing head supporting means mounted on the supporting body, and a sealing head mounted on the supporting body has been put to practical use. The sealing head supporting means includes a central shaft fixed to the supporting body and a rotating member mounted around the central shaft, the central shaft moving up and down integrally with the supporting body, and the rotating member is the center. It is rotatable relative to the shaft and moves up and down together with the central shaft. Further, the sealing head includes a mounting portion, a pressing center shaft for preventing relative rotation of the cap fitted on the mouth and neck of the container, and a thread roller and a skirt roller for tightening the cap on the mouth and neck of the container. , Has a cap sealer mechanism with a cam that pulls these to the cap. The pressing center shaft is connected to the central axis of the sealing head supporting means and fixed in the rotational direction, and the sealing mechanism is rotatable relative to the center shaft, and rotates the rotating member of the sealing head supporting means. Connect and rotate. Further, both the center shaft and the sealing mechanism move up and down together with the sealing head supporting means. A conventional example of this cap sealer will be described below with reference to FIG.

In FIG. 5, the illustrated lid tightening device comprises a supporting body 2, a sealing head supporting means 4 mounted on the supporting body 2, and a tool means 6 mounted on the sealing head supporting means 4. The sealing head support means 4 has a central axis 8 extending in the vertical direction and a rotary member 10 rotatable relative to the central axis 8. A bearing housing 12 is attached to the support body 2, and an elongated cylindrical rotary member 10 is rotatably supported inside the bearing housing 12 via a bearing 14. A conductive pulley 18 is attached to one end of the rotary member 10, that is, an upper end thereof by a fixed member 16, and the conductive pulley 18 and the rotary member 10 are integrally rotated via a key 20. .

On the other hand, the central shaft 8 is disposed inside the rotating member 10, and both ends thereof, that is, an upper end portion and a lower end portion thereof are rotatably supported by the rotating member 10 via bearings 22. One end of the center shaft 8, that is, the upper end is fixed to the L-shaped member by a nut 24, and the other end of the L-shaped member 26 is attached to the upper end of the bearing housing 12. A cap 28 is mounted on the lower end surface of the bearing housing 12, and spacers 30 and 32 are interposed between the bearing 14 and between the bearing 14 and the transmission pulley 18, respectively. Further, between the pair of bearings 22, 22 and the bearing 22 and the L-shaped member 2
Spacers 34 and 36 are also interposed between 6 and 6, respectively. As described above, in the sealing head supporting means 4, the central body 8 and the rotary member 10 are vertically moved integrally with the supporting body 2 by vertically moving the supporting body 2 by a mechanism (not shown). The support body 2 does not rotate about an axis extending in the vertical direction. Therefore, when the conductive pulley 18 is rotated in a predetermined direction by a conductive member (not shown) such as a conductive belt, the rotating member 10 is rotated in the predetermined direction relative to the support body 2 and the central shaft 8.

Next, the tool means 6 will be described. The tool means 6 comprises a pressing tool means indicated by 38 and a tightening tool means indicated by 40. The pressing tool means 38 includes the central shaft 42 and the pressing means. Has a tool 44, one end of this shaft 42,
That is, the upper end is mounted so as to rotate integrally with the other end of the central shaft 8 of the sealing head supporting means 4, that is, the lower end. The pressing tool 44 is attached to the other end of the center shaft 42, that is, the lower end, and a recess having a shape substantially corresponding to the top wall (not shown) of the lid fitted to the mouth and neck of the container is formed on the other end. Has been done. Further, the tightening tool means 40 has a pair of bending rollers (skirt rollers) 46 and a pair of thread forming rollers (thread rollers) 48, which are arranged at intervals of substantially 90 degrees.

A sleeve-shaped outer shaft member 50 is arranged outside the central shaft 42, and both ends of the central shaft 42 are bearings 5.
It is rotatably supported by the outer shaft member 50 via the shaft 2. A member 54 is fixed to the outer shaft member 50.
4, a swing lever 58 is swingably mounted via a shaft 56, and a bending roller 46 and a screw forming roller 48 rotate at the lower end of each swing lever 58 via a sleeve 60. It is freely attached (the bending roller 46 is attached to the two opposing swing levers 58, and the screw forming roller 48 is attached to the remaining two swing levers 58). Further, the bending roller 46 and the thread forming roller 48
Is held at the position shown in FIG. 5 by the biasing action of the coil spring 62, but against the biasing action of the coil spring 62,
It is possible to move downward from the position shown in FIG. Further, the tool means 6 includes a bending roller 46 and a thread forming roller 48.
Includes an actuating mechanism 64 for displacing radially inward, i.e., for causing the rollers 46 and 48 to act on the skirt wall of the lid fitted to the container.

The actuating mechanism 64 includes a cam 66 and a driven roller 68 that cooperates with the cam 66. The cam 66 is composed of a sleeve-shaped member, and the outer shaft member 50
A key 70 is interposed between the cam 66 and the outer shaft member 50, and a cam portion is provided on the outer peripheral surface of the cam 66 at substantially 90 ° intervals. ing. On the other hand, the driven rollers 68 are rotatably mounted on the actuating arm 72 rotatably mounted on the shaft 56 via a short shaft, and each driven roller 68 contacts a corresponding cam portion of the cam 66. The cam 66, the outer shaft member 50, and the central shaft member 4
2 (further, the member 54 and the swing arm 58) are relatively movable in the vertical direction, and the outer shaft member 5 with respect to the cam 66.
When 0 and the central shaft 42 are moved up and down relatively, the swing lever 58 is swung inward by the cam portion of the cam 66 via the driven roller 68 and the operating arm 72, whereby the folding roller 46 and The spiral forming roller 48 is moved inward.

Referring to FIG. 5, when the lid fitted on the mouth and neck of the container is tightened, the transmission pulley 18 is rotated in a predetermined direction, whereby the rotating member 10 of the sealing head supporting means 4 and the tool means 6 are rotated. The cam 66, the outer shaft member 50, the member 54, the swing lever 58 (also the operating arm 72 and the driven roller 68 mounted on these), the bending roller 46.
And the spiral forming roller 48 is rotated in the predetermined direction.
Then, in such a state, the support body 2 (and the sealing head support means 4 and the tool means 6 integrally therewith) are moved downward. When the support body 2 is lowered, first, the pressing tool 44 of the pressing tool means 38 abuts on the peripheral portion of the top wall of the lid (not shown) fitted on the mouth and neck of the container, and this lid is attached to the container. Press on the mouth and neck. When the pressing tool 44 abuts in this manner, the central shaft 42, the central shaft 8, the L-shaped member 26,
Through the bearing housing 12 and the support body 2, the relative rotation of the lid with respect to the container is reliably prevented.

When the support body 2 is further lowered after the pressing tool 44 comes into contact with the container lid, the lowering of the pressing tool 44 is blocked by the container (not shown), so that the spring means (not shown) is provided.
Against the biasing action of the pressing tool means 38, namely the pressing tool 4.
4 and the central shaft 42 are moved upward relative to the other components (sealing head support means 4 and clamping tool means 40). Therefore, the cam portions provided on the cam 66 act on the corresponding driven rollers 68, and the driven rollers 6
The swing lever 58 is swung inward via the actuator 8 and the operating arm 72. Therefore, the bending roller 46 is tilted inward in the radial direction and acts on the lower end of the skirt wall of the lid, and the lower end of the skirt wall is bent inward in the radial direction, and the locking jaw formed on the mouth and neck of the container. It is locked to a part (not shown). At the same time, the thread forming roller 48 is tilted inward in the radial direction and acts on the main portion of the skirt wall of the lid, and the female thread is formed on the main portion of the skirt wall corresponding to the male thread formed on the neck portion of the container. Form a thread.

[0010]

However, the above-mentioned FIG.
In the conventional cap sealing head shown in FIG. 1, many parts are incorporated in the swing lever 58 that supports the thread roller and the skirt roller for tightening the cap to the mouth and neck of the container, the structure is complicated, and the cost is high. was there. Further, since the push-cut positions of the thread roller and the skirt roller are fixed, there is a drawback that it is not possible to cope with variations in the neck and neck dimensions of the container. The present invention has been proposed to solve the above conventional problems.

[0011]

Therefore, according to the present invention, a central shaft fixedly supported by an ascending / descending support body and having a coaxial core hole at its lower end, and relatively rotatable outside the central shaft. A cap sealing head which is attached to a rotating member having a connecting means for detachably attaching the sealing head, and which is coupled to a lower portion of the sealing head supporting means, wherein the cylinder is connected to the rotating member of the sealing head supporting means The cam, a plurality of mounting blocks mounted on the bottom surface of the cylindrical cam on the bottom surface of the cylinder so as to be circumferentially equidistantly mounted, and equally mounted on the circumference so as to engage with the mounting blocks and slide up and down. A bearing case having a plurality of vertical grooves is supported by the bearing case through a bearing, and the shaft at the upper end is in the hole at the lower end of the central shaft of the sealing head supporting means. The center shaft having a cap retainer at the lower end and a spring receiver fixed to the lower portion of the mounting block, and presses down the center shaft. And a head spring installed via a thrust bearing and symmetrically attached to the outer circumference of the bearing case, and in the middle part on the horizontal axis in the tangential direction of the circumference with the vertical axis of the sealing head as the center line. A pair of leaf spring levers having a freely rotatable roller and a thread roller provided at the lower end, and a pair of leaf spring levers on the outer periphery of the bearing case, which are symmetrically attached to the leaf spring lever at a position rotated by 90 degrees, and a sealing head at an intermediate portion. Another pair has a roller that can freely rotate on a horizontal axis in the circumferential tangential direction with the vertical axis as the center line, and has a skirt roller at the lower end. The center shaft lower end, which is in a relatively rotation stopped state, is made up of a leaf spring lever and pushes an untightened cap that covers the container, and then the descending stroke is carried out. The lower cam of the cylindrical cam is also in a rotating state. The roller on the leaf spring lever is pushed to move the thread roller and the skirt roller inward to tighten the cap, and the eccentric shaft of the roller is rotated. By doing so, the winding and pushing force of the thread roller and the skirt roller can be adjusted, and this is a means for solving the problem.

[0012]

After the sealing head supporting means supported by the vertically movable supporting body descends and the cap retainer at the lower end of the center shaft in the relatively stopped state pushes the untightened cap on the container, By the subsequent descending stroke, the cam portion of the cylindrical cam in the rotating state descends and also rotates in the same manner, but the roller on the leaf spring lever that does not descend is pushed to move the thread roller and the skirt roller inward. Move to tighten the cap. Further, by rotating the horizontal eccentric shaft that supports the roller, the position of the roller is changed, and the moving distance of the leaf spring lever is changed, so that the cap tightening pushing force of the thread roller and the skirt roller can be increased or decreased. Further, since the leaf spring lever for operating the thread roller and the skirt roller has flexibility in the moving direction, it is possible to cope with a dimensional error of the container neck.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 4 are sectional views of a cap sealing head showing one embodiment of the present invention. In the figure, the cap sealing head device comprises a support main body 2 that can be raised and lowered, a sealing head support means 4 mounted on the support main body 2, and a sealing head 11 attached to this.
Since the sealing head supporting means 4 fixedly supported by the supporting body 2 is basically the same as that described in the above-mentioned conventional example, the same parts are designated by the same reference numerals. To Now, the sealing head support means 4 is
It has a central shaft 8 extending in the vertical direction and a rotating member 10 which is rotatable relative to the central shaft 8. A bearing housing 12 is attached to the support body 2, and an inner side of the bearing housing 12 is provided. An elongated cylindrical rotary member 10 is rotatably supported by a bearing 14 on the. At the upper end of the rotating member 10, the transmission pulley 18 is attached by the nut 16.
Is mounted, and a key 20 is interposed between the conductive pulley 18 and the rotating member 10 so that they both rotate together.

The central shaft 8 is disposed inside the rotary member 10, and its upper end portion and lower end portion are rotatably supported by the rotary member 10 via bearings 22. Further, the upper end of the central shaft 8 is fixed to the L-shaped member 26 by the nut 24, and the other end of the L-shaped member 26 is attached to the upper end of the bearing housing 12. A cap 28 is attached to the lower end surface of the bearing housing 12, and the bearings 14, 1
4 and between the bearing 14 and the transmission pulley 18, spacers 30 and 32 are provided, respectively. Further, spacer members 34 and 36 are provided between the pair of bearings 22, 22 and between the bearing 22 and the L-shaped member 26, respectively. In this way, in the sealing head supporting means 4, the central shaft 8 and the rotating member 10 also move up and down when the support body 2 moves up and down by a mechanism (not shown). Further, the support body 2 is not rotationally driven about an axis extending in the vertical direction, and therefore, when the conductive pulley 18 is rotationally driven in a predetermined direction by a conductive member (not shown) such as a conductive belt, the rotary member 10 is rotated. Is the support body 2 and the central axis 8
It rotates in a predetermined direction relative to. A bush 41 having a square hole is fixedly provided at the lower end of the central shaft 8.

Next, the sealing head 11 will be described. The head 11 and a cylindrical cam 45 which is directly coupled to the rotating member 10 of the sealing head supporting means 4 can relatively slide up and down inside the cylindrical cam 45. It is composed of a structural sealing roll mechanism. The cylindrical cam 45 has a male screw 45a on its upper portion, and is screwed with a female screw 43a of the sealing head coupling nut 43 so that it can be easily attached to and detached from the rotary member 10. Further, the key 35 is provided between the cylindrical cam 45 and the rotating member 10 which are connected to each other.
, And both of them rotate integrally. Inside the same cylindrical cam 45, four mounting blocks 47 are evenly arranged on the circumference and are mounted together with a spring receiver 49 by bolts 55. There is. A cam 45b is provided at the lower end of the cylindrical cam 45.
And a bearing case 57 that is a sliding member of a sealing roll mechanism that slides in the cylindrical cam 45.
Has four vertical grooves 57a evenly arranged on the circumference.
Engages the mounting block 47 in the vertical groove 57a of
The inside of the cylindrical cam 45 can be slid up and down.

Reference numeral 61 is a center shaft supported by the bearing case 57 via a bearing 59, and has an angular axis 61a at its upper end. The angular axis 61a of the bush 41 at the lower end of the central axis 8 of the sealing head supporting means 4. It is fitted in the square hole so that it can slide in the vertical direction. A cap retainer 75 is attached to the lower end of the center shaft 61, and a head spring 65, a thrust bearing 69 and a nut 71 are provided between the center shaft 61 and the spring receiver 49 fixed to the attachment block 47. The center shaft 61 is urged so as to be pushed down via. A pair of leaf spring levers 81 are symmetrically attached to the outer circumference of the bearing case 57. A support block 91 is fixed to the lower end of the leaf spring lever 81 and a sleeve 97 is screwed to the support block 91.
A thread roller 93 is rotatably attached to the.
Further, the leaf spring lever 8 on the outer periphery of the bearing case 57
At the position rotated by 1 and 90 degrees, another pair of leaf spring levers 81
Is installed. A support block 91 is similarly fixed to the lower end of the leaf spring lever 81, and a skirt roller 95 is attached to a sleeve 99 screwed with the support block 91.
Is rotatably attached.

Thread roller 93 and skirt roller 9
5, the coil spring 101 is interposed between each of the other ends and the sleeve 97 and the sleeve 99, and the coil spring 101 is held at the illustrated position by the urging force of the coil spring 101.
The coil spring 101 can be moved downward from the illustrated position against the biasing force of the coil spring 101. Further, a horizontal eccentric shaft 53 is attached to an intermediate portion of each leaf spring lever 81 as shown in FIG. 3, and a roller 51 is fitted on the horizontal eccentric shaft 53 so as to freely rotate.
The horizontal eccentric shaft 53 is attached to the plate spring lever 81 by a nut 83 and a set screw 85 while adjusting the eccentric angle. e is an eccentric dimension of the horizontal eccentric shaft 53, and the roller 51 can move in and out of a leaf spring lever 81 in a dimension of ± e. That is, if the horizontal eccentric shaft 53 is projected outward, the roller 51 is pushed by the cam 45b of the cylindrical cam 45 to move further, and the processing force of the thread roller 93 and the skirt roller 95 can be increased.

An elongated hole is formed in the lower end of the center shaft 61, and a detection shaft 73 is slidably fitted in the elongated hole. A horizontal pin 79 is provided in the middle of the detection shaft 73.
Is inserted, the pin 79 penetrates the elongated hole 61c of the center shaft 61 and is stopped by a ring 77, and a bearing 87 is fitted in the ring 77. Unsealed cap 39 on container 37 in the process of cap sealing
If it is covered by the sensor shaft 73, as shown in FIG.
Is pushed up, and at the same time, the ring 77 also rises to form a space in which the support block 91 at the lower end of the leaf spring lever 81, the thread roller 93 and the skirt roller 95 supported by the support block 91 can move inward, and the cap sealing is performed without any trouble. However, if the container 39 is not covered with the cap 39, the detection shaft 73 is also attached to the ring 7.
7 also does not rise, and the support block 9 at the lower end of the leaf spring lever 81
1 stops at the bearing 87 of the ring 77, the leaf spring lever 81 bends, and the thread roller 93 and the skirt roller 95 do not directly touch the mouth and neck of the container 37.

The operation of the embodiment constructed as described above will now be described. FIG. 1 shows a state in which the container 37 is not provided under the sealing head 11, and FIG. 4 shows a cap 39 provided under the sealing head 11. It shows a state in which the covered container 37 is placed and the cap sealing operation is being performed. In the cap sealing step, the transmission pulley 18 is rotationally driven in a predetermined direction, whereby the rotating member 10 of the sealing head supporting means 4 and the cylindrical cam 45 of the sealing head 11 and the supporting block fixed to the cylindrical cam 45. 47, a bearing case 57 that engages with the support block 47, a leaf spring lever 81 attached to the bearing case 57, and a leaf spring lever 81
The thread roller 93 and the skirt roller 95 provided at the lower end of the are simultaneously driven to rotate in a predetermined direction. In this state, when the ceiling head support means 4 supported by the vertically movable support body 2 descends, the rotation direction is restricted by the central shaft 8 fixedly provided on the support body 2, and the rotation is relatively stopped. The cap retainer 75 at the lower end of a certain center shaft 61 is used to cover the container 37 with the cap 3
The upper surface of 9 is abutted, and the head spring 65 pushes this. In addition, since the container 37 is also relatively in the rotation stopped state,
The relative rotation of the cap 39 with respect to the rotating portion of the sealing head 11 is reliably prevented.

The subsequent lowering stroke of the sealing head 11 lowers the lower cam 45b of the rotating cylindrical cam 45, and pushes the roller 51 attached to the leaf spring lever 81 which is in the synchronous rotating state but does not lower. As shown in FIG. 4, the thread roller 93 and the skirt roller 95 provided at the lower end of the leaf spring lever 81 are moved inward to perform the tightening operation (the one indicated by the two-dot chain line in FIG. , There is no cap 39 and the sealing head 11 is naturally lowered. That is, the thread roller 93 acts on the peripheral wall of the cap 39 and forms a female screw on the peripheral wall of the cap 39 corresponding to the male screw formed on the mouth and neck of the container 37. At the same time, the skirt roller 95 acts on the lower end of the skirt of the cap 39, bending the lower end of the skirt inward,
It is locked to the locking jaw formed on the mouth and neck of the container 37. Further, since the leaf spring lever that operates the thread roller 93 and the skirt roller 95 has flexibility in the moving direction, it is possible to cope with the dimensional error of the neck of the container. Further, after the sealing head 11 is rotated by a predetermined angle to complete the sealing work, the cylindrical cam 45 is lifted by raising the support body 2.
The cam 45b of is separated from the roller 51 of the leaf spring lever 81,
The thread roller 93 and the skirt roller 95 move to the outside, and the supporting body 2 further rises to complete one sealing step, discharge the container 37, and move to the next step. When the cap processing pressing force is to be changed, the nut 83 to which the horizontal eccentric shaft 53 is attached and the set screw 85 are loosened to adjust the eccentric amount of the horizontal eccentric shaft 53, and the nut 83 and the set screw 85 are used again to adjust the horizontal eccentric shaft. Fix 53.

[0021]

As described above in detail, according to the present invention, the swing lever in the conventional sealing head is replaced with the lever having the leaf spring structure, so that the operating mechanism is simplified and the cost is reduced. Further, since the leaf spring lever has flexibility in the moving direction, the operating range of the lever has flexibility, and it is possible to cope with variations in the dimensions of the container neck.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a cap sealing head according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a cap sealing head according to an embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a longitudinal sectional view showing the cap sealing head according to the embodiment of the present invention in an operating state different from that in FIG.

FIG. 5 is a vertical sectional view of a conventional cap sealing head.

[Explanation of symbols]

 2 Supporting Body 4 Sealing Head Supporting Means 8 Center Shaft 10 Rotating Member 11 Sealing Head 12 Bearing Housing 45 Cylindrical Cam 47 Mounting Block 49 Spring Bearing 51 Roller 53 Horizontal Eccentric Shaft 57 Bearing Case 61 Center Shaft 65 Head Spring 75 Cap Presser 81 Leaf Spring Lever 83 Plate cam 93 Thread roller 95 Skirt roller

Claims (2)

[Claims] 1. A center shaft, which is fixedly supported by a vertically movable support body, has a coaxial core hole at its lower end, and is rotatably attached to the outside of the center shaft, and a sealing head is detachably attached. A cap sealing head configured by a rotating member having a connecting means and coupled to a lower portion of the sealing head supporting means, a cylindrical cam connected to the rotating member of the sealing head supporting means,
A plurality of mounting blocks mounted on the bottom surface of the downward facing cylindrical bottom surface of the same cylindrical cam, and a plurality of vertical mounting blocks arranged on the circumference so as to engage with the mounting block and slide up and down. A bearing case having a groove and a bearing case supported by the bearing case, the shaft at the upper end is fitted in a hole at the lower end of the central axis of the sealing head support means so as to be slidable in the axial direction, and the cap at the lower end. A head spring that is installed via a thrust bearing by urging the center shaft having a retainer and the center shaft and a spring receiver fixed to the lower part of the mounting block so as to push down the center shaft. And symmetrically attached to the outer circumference of the bearing case, and can freely rotate on the horizontal axis in the circumferential tangential direction with the vertical axis of the sealing head as the center line in the middle part. A pair of leaf spring levers having rollers and thread rollers provided at the lower end, and symmetrically attached at a position rotated 90 degrees with the leaf spring lever on the outer circumference of the bearing case, centered on the vertical axis of the sealing head in the middle part. The center, which has a pair of leaf spring levers having a roller that can freely rotate on the horizontal axis in the tangential direction of the circumference, which is a line, and a skirt roller provided at the lower end, and is in a relatively stopped rotation state. After the cap retainer at the lower end of the shaft pushes the untightened cap that covers the container, the lower stroke of the cylindrical cam in the rotating state is also caused by the descending stroke that is performed subsequently. The cap sealing is performed by pushing the roller to move the thread roller and the skirt roller inward to tighten the cap. De. 2. The cap sealing head according to claim 1, wherein the winding and pushing force of the thread roller and the skirt roller can be adjusted by rotating an eccentric shaft of the roller.