JP2020179947A - Roller device - Google Patents

Abstract

To provide a roller device capable of adjusting a distance between side surfaces of a pair of rollers according to a thickness of a film.CONSTITUTION: The roller device holds a film in contact with the sides of a first roller 11 and a second roller 12. The second roller is rotatably mounted on a base member 30 and has a fulcrum axis 33, arranged along a film transport direction, rotatably attached to a pair of front and rear arm units 31 provided underneath the base member. The fulcrum axis is fixed to the arm units when a set screw is tightened, and the second roller approaches or leaves the first roller as the fulcrum axis rotates forward or reverse. When the set screw is loosened, the fulcrum axis rotates relative to the arm units, allowing a relative angular position to be changed. The fulcrum axis is an eccentric axis, and by changing the relative angular position, a distance between the sides of the rollers when the pair of rollers are closed can be changed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a roller device that sandwiches a film between a pair of rollers.

For example, a center seal device used in a pillow wrapping machine or the like is arranged on the downstream side of a bag making machine in which a strip-shaped film is made into a tubular bag and both side edges of the film are overlapped, and the both side edges of the overlapped film are overlapped. The polymer end is sandwiched and heated and pressurized to heat-seal. As disclosed in Patent Document 1, for example, the center sealing device includes a pair of sealing blocks that heat both side edges of the film, and a pair of pinch rollers arranged before and after the sealing block in the traveling direction. ing. This seal block has a structure in which the film portion of the polymerization end is heated and melted by injecting heating pressure air toward the polymerization end. In addition, the bersealer heated by using a versilla with a built-in heater. In some cases, the surface of the film is heated in contact with or close to the polymerization edge.

The pair of pinch rollers sandwich the polymerized ends of the tubular film from both sides with a predetermined pressure, and rotate in the sandwiched state. As a result, the polymerized end of the tubular film is given a carrying force. Each of these pinch rollers has a rotating shaft connected to the center of the lower surface, and rotates on its axis as the rotating shaft rotates. Further, the pair of pinch rollers are configured so as to be able to take a closed state in which the polymerized portion of the film is sandwiched between the side surfaces thereof and pressurized, and an open state in which the side surfaces are separated from each other. Then, the polymerized portion of the film is easily inserted and arranged between the side surfaces of the pair of pinch rollers in the open state, and then the polymerized portion is sandwiched at a predetermined pressure by closing the pinch rollers.

As one of the mechanisms for opening and closing the pinch roller, there is a single-sided opening structure disclosed in Patent Document 1. In the one-sided opening structure, one of the two rotating shafts is rotatably supported while standing upright in the vertical direction, and the other rotating shaft is forward and reverse within a predetermined angle range around the fulcrum shaft provided below. Make it rotatable. Then, by rotating the fulcrum axis in the forward and reverse directions, the other rotation axis is in a vertically standing posture (both rotation axes are parallel and the pinch roller is closed) and one rotation from the upper end side. The posture is tilted away from the axis (both rotation axes are non-parallel and the pinch roller is open).

Special fair 8-11576

In the conventional single-sided opening structure described above, when the other rotation axis is in a vertically standing posture (both rotation axes are parallel) in the absence of the film, the side surfaces of the pair of pinch rollers come into contact with each other and pinch. The rollers are set to be closed. Therefore, for example, when the polymerized portion of the film is placed at a predetermined position in a state where the pinch rollers are open and the state is changed to a state in which the pinch rollers are closed, the pair of pinch rollers first become the polymerized portions on the lower end side of the side surface. It comes into contact and sandwiches, and as the other rotating shaft stands up, the upper side of the side surface also comes into contact. At this time, the contact portion expands upward while compressing the film portion facing the lower side of the side surface of the pinch roller that first contacts. Therefore, for example, when the pinch roller is closed, the polymerized portion of the film that contacts the lower side of the pinch roller pressurizes and compresses more strongly.

Therefore, if the film becomes thicker, the film portion on the upper side of the pinch roller cannot be crushed even if it is pinched or the pressure is increased, and the film portion on the upper side of the pinch roller cannot be contacted and sandwiched. Even if they are in contact, they may not be able to pressurize firmly. Then, the surface contact with the polymerized portion cannot be firmly held, and the conveying force and the tensile force may not be applied evenly. In addition to the function of applying a conveying force to the film, the seal block and the pinch roller on the downstream side of the Versila pressurize the heated and melted polymerized portion to press both side edges of the film constituting the polymerized portion. May have the ability to fuse. In such a case, if the entire polymerized portion cannot be pressurized or the pressing force is not sufficient, it may not be possible to uniformly seal the entire polymerized portion.

Further, the pressing force is adjusted according to the thickness of the film, but for example, if the type uses both a thick film and a thin film, there is a problem that it is difficult to make an adjustment suitable for both.

The above-mentioned problems are described as independent of each other, and the present invention does not necessarily have to be able to solve all of the described problems, as long as at least one problem can be solved. In addition, we have the intention to acquire the rights to the structure for solving this problem independently by divisional application, amendment, etc.

In order to solve the above-mentioned problems, the roller device of the present invention is (1) a roller device that sandwiches a film between the side surfaces of a pair of rollers in a contact state, and at least one roller of the pair of rollers is the film. The rollers that can be linked to the fulcrum shafts that are arranged along the transport direction of the fulcrum shaft and that can be linked to the fulcrum shafts In a state where the linkage is released, the fulcrum shaft is configured to be able to rotate forward and reverse independently of the roller, the fulcrum shaft is an eccentric shaft, and the linkage is By rotating the fulcrum axis in the released state, the rollers in the linked state are brought closer to the sandwiching position of the film, and the distance between the side surfaces of the rollers when the pair of rollers is closed is reduced. I changed it.

In this way, the distance between the side surfaces of the pair of rollers in the state of sandwiching the film can be changed. Therefore, for example, when the thickness of the sandwiched film is thin, the distance between the side surfaces of the pair of rollers is set to 0 or narrow, and the film thickness is reduced. If the thickness is thick, adjust so that the distance between the sides of the pair of rollers is long. In this way, the entire film portion having a predetermined width of the film can be firmly contacted and held by the side surfaces of the pair of rollers, and when the pair of rollers rotate in that state, the film is conveyed to the film. The force and tensile force can be applied evenly.

(2) The rotating shafts of the rollers that can be linked take a standing posture and an inclined posture with the forward and reverse rotation of the fulcrum shaft, and the pair of rollers are closed in the standing posture. It is preferable that the film is sandwiched and the pair of rollers are opened in the tilted posture to release the sandwiching of the film.

(3) A support member for rotating the linkable roller is provided, and the fulcrum shaft penetrates through through holes of a pair of arm portions provided in the support member, and the fulcrum shaft and the through hole. Is relatively rotatably mounted, and the support member may be configured to rotate with the rotation of the fulcrum shaft in a state where the fulcrum shaft and the through hole are connected by fixing means. The support member may be composed of, for example, the base member 30, the arm portion 31, the second rotating shaft 25, and the like according to the embodiment. The fixing means may be configured by, for example, the set screw 34 of the embodiment.

(4) The pair of rollers may be pinch rollers that convey the film in the packaging machine.

According to the present invention, the distance between the side surfaces of the pair of rollers can be adjusted according to the thickness of the film, and the side surfaces of the rollers are sandwiched between a thick film or a thin film. Can be uniformly contacted with a predetermined area of the film.

It is a perspective view which shows the state of the driving posture of one preferable embodiment of the roller apparatus which concerns on this invention. It is the front view. FIG. 2 is a cross-sectional view taken along the line XX in FIG. It is a front view which shows the state which the fulcrum axis is rotated by a predetermined angle in the state of a driving posture. It is a front view which shows the state of the standby posture which opened a pair of rollers.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not construed as being limited to this, and various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art without departing from the scope of the present invention.

FIG. 1 shows an example of a pinch roller device which is a form of a roller device according to the present invention. The pinch roller device 10 is incorporated into, for example, a center seal device of a packaging machine. Although not shown, the center sealing device continuously seals the sealing side edges in the direction along the conveying direction of the film to be conveyed, for example, a pair of films arranged on both sides of the film and heating the film portions to be sealed. A pair of pinch rollers arranged on the upstream side of the sealer and the pair of sealers to supply the film to the pair of sealers by applying a conveying force while sandwiching the film portion, and a pair of pinch rollers arranged on the downstream side of the sealer and heated. It is provided with a pair of pinch rollers (sometimes referred to as "press rollers" or the like) that apply a conveying force toward the downstream while sandwiching the film portion. The pinch roller device of this embodiment includes the above-mentioned pair of pinch rollers and a mechanism for rotationally driving the pinch rollers. It can be applied to both the upstream pinch roller and the downstream pinch roller. The specific configuration is as follows.

The pinch roller device 10 of the present embodiment applies a conveying force to the film in the horizontal direction, and the first roller 11 and the second roller 12 are arranged on the left and right sides of the film conveying path, respectively. For example, in FIG. 1, the film (not shown) moves from the front left side to the back right side. Therefore, in this example, the first roller 11 is arranged on the left side in the film transport direction, and the second roller 12 is arranged on the right side. The first roller 11 and the second roller 12 are directly or indirectly rotated and supported by a housing 15 having a predetermined shape.

The housing 15 has a strip-shaped bottom surface portion 15a arranged so as to extend in a direction orthogonal to the film transport direction, and a package mounted on one end side of the bottom surface portion 15a (for example, on the left side in the transport direction). It is provided with a side wall portion 15b that is vertically arranged (on the back side of the machine) and a top surface portion 15c that is connected to the upper end of the side wall portion 15b and is arranged above the bottom surface portion 15a. The top surface portion 15c has a length of about half of the length in the longitudinal direction above the bottom surface portion 15a, and the tip portion 15d on the non-connecting side with the side wall portion 15b has a shape of hanging downward.

The first roller 11 connects the first rotating shaft 16 so as to hang downward from the center of the lower surface thereof. The first rotating shaft 16 is arranged so as to penetrate the top surface portion 15c of the housing 15 and reach the bottom surface portion 15a, and is supported by bearings provided on the top surface portion 15c and the bottom surface portion 15a, respectively. As a result, the first rotating shaft 16 is rotatably arranged in a state of standing upright with respect to the bottom surface portion 15a, and the first roller 11 rotates integrally with the first rotating shaft 16.

The bevel gear 18 is connected to the position near the upper surface of the bottom surface portion 15a in the housing 15 of the first rotating shaft 16, and the first rotating shaft 16 and the bevel gear 18 rotate integrally. The bevel gear 19 that meshes with the bevel gear 18 is attached to the tip of the drive shaft 20 that is bearing-supported by the side wall portion 15b of the housing 15. The other end side of the drive shaft 20 is connected to the drive motor directly or via a predetermined power voltage mechanism. As a result, the rotational output of the drive motor is transmitted to the first roller 11 via the drive shaft 20, the bevel gears 19, 18 and the first rotary shaft 16, and the first roller 11 rotates on its axis.

Further, the first gear 21 is attached to a predetermined position on the first rotating shaft 16 above the top surface portion 15c of the housing 15. The first gear 21 rotates integrally with the first rotating shaft 16. Then, the first gear 21 and the second gear 22 provided on the second rotating shaft 25 hanging down from the center of the lower surface of the second roller 12 are configured to be meshable. When the first gear 21 and the second gear 22 are in mesh with each other, the rotational force of the drive motor is transmitted to the second rotating shaft 25 and the second roller 12 via the first gear 21 and the second gear 22, and the second roller 12 rotates.

The lower end region of the second rotating shaft 25 of the second roller 12 is bearing-supported by the block-shaped base member 30. Further, the second gear 22 is attached to the intermediate region of the second rotating shaft 25, and the second rotating shaft 25 rotates integrally with the second gear 22. As shown in FIG. 2 and the like, in the present embodiment, the tooth width of the second gear 22 is longer than that of the first gear 21, and the first gear 21 is configured to mesh in the lower region of the second gear 22.

The lower surface of the base member 30 is integrally provided with a pair of arm portions 31 extending downward at the front and rear edge edges in the film transport direction. The arm portion 31 includes a through hole 31a extending in the thickness direction, that is, in the direction parallel to the film transport direction. The through holes 31a provided in the pair of arm portions 31 are configured to be located on the same straight line. Further, a sleeve 32 is inserted into each through hole 31a, and a fulcrum shaft 33 is inserted and arranged so as to penetrate between the sleeves 32.

Further, a bearing portion 35 is arranged between the pair of front and rear arm portions 31, and the fulcrum shaft 33 is arranged so as to penetrate the bearing portion 35. Then, the bearing portion 35 is arranged at the upper end of the support column 36 that stands up on the upper surface of the bottom surface portion 15a of the housing 15. As a result, the fulcrum shaft 33 is rotatably supported by the bearing portion 35 at a predetermined position above the housing 15, and rotates about the axis of the through hole 35a of the bearing portion 35 as the center of rotation.

A set screw 34 is attached to the lower end of the arm portion 31, and the tip of the set screw 34 is brought into contact with the sleeve 32. When the set screw 34 is tightened, the urging force is transmitted to the fulcrum shaft 33 via the sleeve 32, and the fulcrum shaft 33 and the arm portion 31 and the base member 30 are integrated with the fulcrum shaft 33 to form a through hole in the bearing portion 35. It rotates forward and reverse within a predetermined angle range with the axis of 35a as the center of rotation. Along with this, the second rotating shaft 25 and the second roller 12 attached to the base member 30 also rotate in the forward and reverse directions within a predetermined angle range with the axis of the through hole 35a as the center of rotation together with the fulcrum shaft 33. .. Therefore, the operating posture (see FIGS. 2 and 4) in which the second rotating shaft 25 stands up and the second roller 12 is closed so that the film can be sandwiched between the first roller 11 and the upper end side of the second rotating shaft 25 It is tilted away from the first rotation shaft 16 and shifts between the standby postures (see FIG. 5) in which the side surfaces of the second roller 12 and the first roller 11 are separated from each other and opened.

On the other hand, when the set screw 34 is loosened, the linkage between the fulcrum shaft 33 and the arm portion 31 is released, and the fulcrum shaft 33 is relative to the arm portion 31 with the axis B of the tip portion 33a of the fulcrum shaft 33 as the center of rotation. It becomes rotatable. Further, the fulcrum shaft 33 is composed of an eccentric shaft. Specifically, the shaft core B of the tip portion 33a on both sides of the fulcrum shaft 33 and the shaft core A of the central portion 33b are displaced from each other. The deviation of both shaft cores may be, for example, 1 mm.

Then, the tip portion 33a is inserted and arranged in the arm portion 31 (sleeve 32), and the central portion 33b is inserted and arranged in the bearing portion 35. As described above, the fulcrum shaft 33 rotates around the shaft core of the through hole 31a of the bearing portion 35, that is, the center portion 33b of the central portion 33b of the fulcrum shaft 33 when rotating, and the fulcrum shaft 33 rotates with the rotation. The central position of the tip portion 33a also rotates around the axis of the central portion 33b.

At this time, for example, if the tip portion 33a of the fulcrum shaft 33 and the through hole 31a of the arm portion 31 are relatively rotated to displace the relative positional relationship between the shaft cores A and B, for example, the rotation angle of the support shaft 28, That is, the position of the second roller 12 is displaced with respect to the inclination angle of the second rotating shaft 25. For example, when the second rotating shaft 25 is in an upright operating posture, for example, as shown in FIG. 3, the shaft core A of the central portion 33b and the shaft core B of the tip portion 33a are located so as to overlap in the vertical direction. It is assumed that the shaft core B exists at a position displaced above the shaft core A by a predetermined distance (for example, 1 mm). In this state, the side surfaces of the first roller 11 and the second roller 12 are set to come into contact with each other (see FIG. 2). Then, for example, when the fulcrum shaft 33 and the arm portion 31 are relatively rotated in a predetermined direction while the second rotation shaft 25 is upright, the shaft core B is rotationally moved in a direction away from the first rotation shaft 16. Along with this, the side surfaces of the first roller 11 and the second roller 12 are separated from each other, and a predetermined gap S is generated. For example, as shown in FIG. 4, when rotated about 6 degrees, for example, the side surfaces of the first roller 11 and the second roller 12 are separated from each other by 0.1 mm, and a gap S is formed. Then, since the separation distance also changes by changing the rotation angle, the separation distance is adjusted according to the film thickness.

As described above, in the present embodiment, for example, when the second rotating shaft 25 is placed in a vertically standing posture (both rotating axes are parallel) in the absence of the film, the first roller 11 and the second roller 12 The setting in which the side surfaces come into contact with each other is set to the reference angle position of the relative angle between the fulcrum shaft 33 and the arm portion 31 (through hole 31a) in the driving posture, and the fulcrum shaft 33 is rotated by a predetermined angle with respect to the arm portion 31 from the reference angle position. Then, the side surfaces of the first roller 11 and the second roller 12 are separated from each other, and the separation distance becomes a length corresponding to the rotation angle. Therefore, for example, when the film to be sealed is thick, when the set screw 34 is tightened in advance in a state where the film is relatively rotated at an appropriate angle to connect the fulcrum shaft 33 and the arm portion 31, the second rotating shaft 25 is formed. Since a predetermined gap is formed between the side surfaces of the first roller 11 and the second roller 12 in the standing operating posture, the entire side surfaces of the first roller 11 and the second roller 12 come into surface contact with the film at a desired pressure. The entire film portion can be pressed. As a result, the conveying force and the tensile force can be evenly applied to the sandwiched film portion. For example, in the pinch roller device on the upstream side, the film portion to be sealed toward the pair of sealers can be stably supplied. In the pinch roller device on the downstream side, the film part heated by the sealer is firmly sandwiched from the left and right and a conveying force is applied toward the downstream side so that the film part is smoothly pulled out from the sealer and the film part is generally appropriate. It is possible to pressurize the film with a sufficient pressure to fuse it and seal it uniformly over the entire surface.

Below the base member 30, a projecting piece portion 38 that is orthogonal to the film transport direction and extends in a direction away from the film transport path is provided. On the other hand, the cylinder 39 is arranged on the tip end side of the bottom surface portion 15a of the housing 15. The cylinder rod 39 reciprocates in the vertical direction, and the nut portion 40 attached to the tip of the cylinder rod is arranged so as to be in contact with the lower surface of the projecting piece portion 38. The projecting piece portion 38 is urged downward by the elastic restoring force of the coil spring 41, and the projecting piece portion 38 comes into contact with the nut portion 40 by the urging force. Therefore, when the cylinder 39 is operated and the cylinder rod is moved upward, the nut portion 40 pushes up the projecting piece portion 38 upward, the fulcrum shaft 33 rotates accordingly, and the second roller 12 is in the operating posture. The film sandwiched between the roller 11 and the second roller 12 is pressed with a predetermined pressure. Then, when the cylinder rod of the cylinder 39 is moved downward, the projecting piece portion 38 is lowered by receiving the elastic restoring force of the coil spring 41, the second roller 12 is in the standby posture, and the pair of rollers is opened.

It is preferable to have a function of displaying / notifying information on the rotation angle of the fulcrum shaft 33 including the eccentric shaft. In this way, for example, information on the rotation angle when the fulcrum shaft 33 is rotated is displayed and notified, and the user sees the information to determine how much the fulcrum shaft 33 has been rotated, and by extension, the first roller 11. And the distance between the sides of the second roller 12 can be confirmed, and the appropriate separation distance between the first roller 11 and the second roller 12 according to the film thickness can be adjusted easily, accurately, and with good reproducibility. It's good because you can. The information regarding the rotation angle may be, for example, the rotation angle itself, or the film thickness to be sandwiched, such as the distance between the gaps between the first roller 11 and the second roller 12, which is changed with rotation. The display / notification function may be, for example, a function such as a position indicator whose display is changed with the rotation of the fulcrum shaft 33. For example, a memory or the like is provided in a handle, an operation lever, or the like for rotating the fulcrum shaft 33. , It is preferable that the rotation angle and the like can be confirmed from the position of the memory. A configuration in which a memory or the like is provided on a handle, an operation lever, or the like may be realized with a simple configuration.

In the above-described embodiment, an example applied to the pinch roller device has been described, but the present invention is not limited to this, and may be applied to, for example, a center seal device provided with a rotary center sealer.

Although various aspects of the present invention have been described above using embodiments, these embodiments and explanations are not intended to limit the scope of the present invention, and are intended to contribute to the understanding of the present invention. It should be added that it was provided. The scope of the present invention is not limited to the configurations and manufacturing methods explicitly described herein, but also includes combinations of various aspects of the invention disclosed herein. Of the present invention, the configuration for which a patent is sought is specified in the appended claims, but even if the configuration is not currently specified in the claims, it is disclosed in the present specification. I would like to mention that there is a possibility of claiming a patent for this configuration in the future.

10: Pinch roller device 11: First roller 12: Second roller 15: Housing 16: First rotation shaft 25: Second rotation shaft 30: Base member 31: Arm portion 31a: Through hole 32: Sleeve 33: Supporting shaft 34 : Set screw 35: Bearing

Claims (4)

A roller device that sandwiches a film between the sides of a pair of rollers in a contacting state.
At least one of the pair of rollers is configured to be linked to a fulcrum shaft arranged along the transport direction of the film.
The roller that can be linked to the fulcrum shaft is configured to approach and separate from the sandwiching position of the film as the fulcrum shaft rotates in the forward and reverse directions in the linked state.
In the state where the linkage is released, the fulcrum shaft is configured to be rotatable forward and reverse independently of the roller.
The fulcrum shaft is an eccentric shaft, and by rotating the fulcrum shaft in a state where the linkage is released, the rollers in the linked state are brought closer to the sandwiching position of the film, and the pair of rollers. A roller device characterized in that the distance between the side surfaces of the roller is changed when the roller is closed. The rotating shafts of the rollers that can be linked take a standing posture and an inclined posture with the forward and reverse rotation of the fulcrum shaft, and in the standing posture, the pair of rollers are closed to sandwich the film. The roller device according to claim 1, wherein the pair of rollers is opened to release the pinching of the film in the inclined posture. A support member for rotating the linkable roller is provided.
The fulcrum shaft penetrates through through holes of a pair of arm portions provided in the support member, and the fulcrum shaft and the through hole are relatively rotatably mounted.
The roller device according to claim 1 or 2, wherein the support member is configured to rotate with the rotation of the fulcrum shaft in a state where the fulcrum shaft and the through hole are connected by a fixing means. The roller device according to any one of claims 1 to 3, wherein the pair of rollers is a pinch roller that conveys the film in a packaging machine.

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