JPH05245562A - Device for contracting/expanding diameter of can - Google Patents

Abstract

PURPOSE:To provide a device for contracting/expanding of a diameter of a can having simpler structure and lower cost than the one provided currently on a manufacturing line. CONSTITUTION:The device is provided with a diameter contracting device 1 for applying the drawing work at multi-steps to the opening end of a can C successively, a diameter expanding device 3 for applying the flanging work to the opening end of the can C discharged from the diameter contracting device 1 and a carrier passage 2 provided between the diameter contracting device 1 and the diameter expanding device 3. In the diameter contracting device 1, plural diameter contracting dies are arranged along the carrying direction of the can C, and by advancing the diameter contracting dies at the same time, the opening end of the can C is made to gradually contract the diameter. In the diameter expanding device 3, by advancing the diameter expanding die while linking with the carrying movement of the can C, the diameter of the opening end of the can C is expanded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a can diameter reducing / expanding device (hereinafter, simply referred to as a diameter reducing / expanding device) for applying a drawing process and a flange process to an opening end of a can, for example, a beverage. The present invention relates to a diameter reducing and expanding device suitable for test processing of cans.

[0002]

BACKGROUND OF THE INVENTION Normally, the open end of a can filled with beverage is
In order to attach the lid, it is first drawn and then flanged. The drawing process and the flange process are performed by a plurality of molding devices provided in the can manufacturing line.

By the way, in recent years, cans of various shapes have been manufactured from the viewpoints of diversification of filling materials, design economy, etc. When manufacturing cans of such a new shape, Test processing is performed to set the processing conditions. Furthermore, it is necessary to perform test processing in order to improve defects in the production line.

[0004]

[Problems to be Solved by the Invention] However, in the past,
Since drawing and flanging are performed by the molding equipment provided on the production line, it is necessary to temporarily stop the processing of the product on the production line when performing the above-mentioned test processing, which results in large-scale test processing. There is a problem that becomes.

This problem can be solved by providing a molding apparatus similar to the production line only for the test processing, but this molding apparatus is costly and wasteful.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a diameter-reducing / expanding device that is cheaper and has a simpler structure than those provided on a manufacturing line.

[0007]

The diameter reducing and expanding device of the present invention comprises a diameter reducing device for sequentially drawing the opening end of a can in multiple stages and a flange for the opening end of the can discharged from the diameter reducing device. A diameter reducing and expanding device for a can, which includes a diameter expanding device for processing, and a conveying path provided between the diameter reducing device and the diameter expanding device,

The diameter reducing device has a plurality of first holding portions which are arranged in one direction on the base and hold the bottom of the can.
The cans are adjacent to a plurality of diameter-reducing dies, which are provided on the base so as to face the first holding portions and advance toward the first holding portions to reduce the open end of the cans in a multi-step manner. And a conveying means for intermittently conveying to the first holding portion, and a diameter-reducing die driving means for simultaneously driving the diameter-reducing dies forward and backward,

The diameter reducing die comprises an outer die fitted to the outer peripheral side of the open end of the can and an inner die fitted to the inner peripheral side of the open end of the can.

The diameter reducing die driving means includes a rotatable first cam with which the outer die is slidably engaged, and a rotatable second cam with which the inner die is slidably engaged. With a cam,

The diameter expanding device includes a plurality of second holding portions rotatably arranged with respect to the base and holding the bottom of the can, and a die holder which rotates integrally with the second holding portions. A plurality of diameter-expanding dies which are attached to the die holder so as to face the second holding section and which advance toward the second holding section to expand the opening end of the can; A third cam that moves forward and backward with respect to the die holder in association with the rotation of the die holder and the second holding portion,

The first holding portion, the diameter-reducing die, and the second holding portion are provided with pressure detecting means for detecting the pressing force acting in the axial direction of the diameter-reducing and expanding diameters. Characterize.

[0013]

According to the diameter-reducing and expanding device of the present invention, the diameter-reducing device performs the drawing process and the flange-expanding device performs the flange processing.

In the diameter-reducing device, the can to be molded is supported with its bottom portion held by the first holding portion, and the diameter-reducing die is advanced by the diameter-reducing die driving means toward the open end of the supported can. The opening end is reduced in diameter. The can whose diameter has been reduced in the previous step is intermittently conveyed by the conveying means to the adjacent first holding portion, and when the diameter reduction die is advanced next, the diameter in the next step is reduced. In this way, by arranging a plurality of diameter reducing dies along the conveying direction of the can and advancing these plurality of diameter reducing dies at the same time, the diameter of the open end of the can is reduced successively.

In the diametric expansion device, the bottom part is held and supported by the second holding part, and the diametric expansion die attached to the die holder faces the opening end of the supported can.
The opening end is expanded by being advanced by the expanding die driving means in conjunction with the rotation of the holding part of the. In this way, the opening end of the can is expanded in diameter by advancing the diameter expansion die in conjunction with the conveying operation of the can.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A diameter reducing and expanding device according to an embodiment of the present invention will be described below with reference to the drawings.

The diameter reducing and expanding device of this embodiment is shown in FIGS.
As shown in FIG. 2, a diameter reducing device 1 for sequentially performing multi-stage drawing processing on the opening end of the can C, a diameter expanding device 3 for performing flange processing on the opening end of the can C discharged from the diameter reducing device 1, The transport path 2 is provided between the diameter reducing device and the diameter expanding device.

As shown in FIG. 3, the diameter reducing device 1 has a first shaft 15 rotatably supported by a base 4 and driven to rotate, and a plate member 5 fixed to the base 4. Four pads (first holding portions) 6 arranged on the plate-like member 5 side by side in the circumferential direction to hold the bottom of the can C.
Adjacent to the can C, a plurality of diameter-reducing dies 7 which are provided on the base 4 so as to face the pads 6 and advance toward the pads 6 to reduce the open end of the can successively in multiple stages. Conveying means 8 for intermittently conveying to the pad 6, and the diameter reducing dies 7
And a diameter-reducing die driving means 9 for driving the same to advance and retreat simultaneously. A shooter 77 is attached toward the first pad 6 in the diameter reducing device 1.
The can C is dropped inside and the can C is supplied to the diameter reducing device 1.

The diameter-reducing die 7 is provided with an outer die 10 fitted to the outer peripheral side of the open end of the can and an inner die 11 fitted to the inner peripheral side of the open end of the can.

The outer mold 10 has a tubular member 12 interposed therebetween.
It is fixed to a holder member 14 attached to the shaft 15 so as to be movable in the axial direction thereof.
A cam follower 16 is fixed to the rear end of the No. 4.

The inner mold 11 is attached to the front end of a cylindrical shaft member 13 which is coaxially inserted into the cylindrical member 12 so as to move forward and backward, and a cam follower 17 is fixed to the rear end of the shaft member 13. Has been done.

The diameter reducing die driving means 9 is composed of the outer die 10
The cam follower 16 at the rear end is slidably engaged,
The first cam 18 fixed to the shaft 15 and the cam follower 17 at the rear end of the inner mold 11 are slidably engaged with each other, and the second cam 19 fixed to the shaft 15 is engaged.
It has and. The first cam 18 and the second cam 19
Have a phase difference with each other, and the outer die 10 and the inner die 11 are moved forward and backward with a mutual phase difference. For example, when the inner mold 11 is advanced to fit the open end of the can C, the outer mold 10 is advanced toward the open end of the can C, and the outer mold 10 is fitted to the open end. Alternatively, the inner mold 11 may be retracted.

The carrying means 8 is provided with a cylindrical member 20 rotatably attached to the shaft 15 and a pocket portion 22 attached to the peripheral edge of the cylindrical member 20 for holding the body of the can C on the peripheral edge. The plate-shaped member 21 is provided, and the cans C are transported by rotating the cylindrical member 20 intermittently.

An introducing passage 23 for introducing compressed air is formed in the hollow portion of the shaft member 13. When the diameter reducing die 7 is advanced, the compressed air is introduced from the introducing passage 23,
It is designed to be ejected from the diameter-reducing die 7 to fill the inside of the can C to be drawn. The ejection timing of this compressed air can be set by a variable cam.

Between the plate-like member 5 and the pad 6, when the reducing die 7 is fitted to the can C, the pressing force in the axial direction of the can C exerted on the pad 6 by the bottom of the can C is detected. A load cell (pressure detecting means) 25 is attached. Furthermore, in the tubular member 12 to which the outer mold 10 is attached,
A load cell (pressure detecting means) 24 for detecting the pressing force in the axial direction of the can C acting on the tubular member 12 when the outer mold 10 is fitted to the can C is attached. Molding data is obtained based on the pressing force in these load cells 24, 25.

As shown in FIG. 1, the conveying path 2 is composed of a shooter 30 having an inlet facing the downstream side of the last pad 6 in the diameter reducing device 1, and the outlet of this shooter 30 is the above-mentioned. The can C, which is connected to the diameter expanding device 3 and is discharged from the diameter reducing device 1, falls in the shooter 30 and is conveyed to the diameter expanding device 3.

As shown in FIG. 4, the diameter expanding device 1 includes a second shaft 31 rotatably supported by the base 4 and driven to rotate, and a plate-shaped member coaxially fixed to the shaft 31. 32 and the shaft 3 on the periphery of the plate member 32.
1, two pads (second holding portions) 33 that are provided in the radial direction to hold the bottom of the can C, a die holder 34 that rotates integrally with these pads 33, and the pad 33.
A plurality of diameter expansion dies 35 that are attached to the die holder 34 so as to face the pad 33 and advance toward the pad 33 to expand the opening end of the can C, and the diameter expansion die 35.
And a third cam 36 that is driven forward and backward with respect to the die holder 34 in association with the rotation of the plate member 32. A shooter 79 is attached to face the rotation locus of the pad 33 of the diameter expanding device 3, and the shooter 7 is attached.
The can C, which has been subjected to flange processing by the diameter expansion device 3, is dropped inside 9 and discharged.

The diameter-expanding die 35 is fixed to the die holder 34 so as to be able to move back and forth, a cylindrical member 42, a shaft member 37 rotatably mounted to the cylindrical member 42, and the tip of the shaft member 37. Formed mold 38, a gear 39 fixed to the rear end of the shaft member 37, a gear 40 coaxially attached to the second shaft 31 and meshed with the gear 39, and the gear 40 is rotated. And a cam follower 43 attached to the rear end of the tubular member 42.
With.

The cam 36 is fixed to the base 4 via a tubular member 44, the cam follower 43 is engaged with the cam 36, and the shaft 31 is rotated to rotate the plate member 32. And when the die holder 34 is rotated,
Interlocking with this rotation, the diameter expansion die 3 with respect to the die holder 34
5 is moved forward and backward, and flange forming is performed by the forming die 38 of the diameter expanding die 35.

At the center of the shaft member 37 of the expanding die 35, there is formed an introduction passage 45 through which compressed air is introduced.
When advancing the diameter expansion die 35, compressed air is ejected from the introduction path 45 to fill the inside of the can C.

Between the plate member 32 and the pad 33, the pressing force in the axial direction of the can C exerted on the pad 33 by the bottom portion of the can C when the expanding die 35 is fitted to the can C is detected. A load cell (pressure detection means) 45 is attached. Processing data can be obtained based on the pressing force of the load cell 45.

A suction device (not shown) is connected to the pad 33, and the suction device suctions the bottom of the can C so that the can C does not rotate during the flange processing.

The drive system of this embodiment is shown in FIGS.
It will be explained based on.

An electric motor 50 with a reducer is attached to the base 4, and the rotation shaft of the electric motor 50 is
It is connected via a timing belt 52 to a pulley 51 rotatably fixed to the base 4. This pulley 51
Is connected to a pulley 53 fixed to the first shaft 15 via a timing belt 54.

A shaft member 55 is coaxially fixed to the pulley 51, and the shaft member 55 is rotatably supported by the base 4 via a bearing 56. The shaft member 55 is connected to the input end of a gear box 58 via a clutch 57. A shaft member 59 is connected to the output end of the gear box 58 via a clutch 60, and the shaft member 59 has a bearing 61.
It is rotatably supported by the base 4 via. Shaft member 5
A pulley 62 is fixed to the pulley 9.
Is the index gear 64 via the timing belt 63.
This index gear 64 is connected to the input end of
The output end of the pulley 66 through the timing belt 65
Connected with. The pulley 66 is fixed to a shaft member 67, and the shaft member 67 is connected to the cylindrical member 20 via a belt 68. When the input end of the index gear 64 makes one revolution, the cylindrical member 20
Is inserted in the drive system so as to rotate intermittently.

As described above, the pulley 53 is fixed to the first shaft 15, and the pulley 69 is fixed to the first shaft 15, as described above. The pulley 69 is connected via a timing belt 70 to a pulley 71 coaxially fixed to the second shaft 31.

An electric motor 73, which is driven independently of the electric motor 50, is attached to the base 4, and a pulley 74 is fixed to the rotary shaft of the electric motor 73. Is connected to a pulley 76 via a timing belt 75. The rotating shaft of the pulley 76 is connected to the gear 41 via a timing belt 77 as shown in FIG.

A gear 78 is coaxially fixed to the tip of the first shaft 15, and a gear 80 connected to a handle 79 meshes with the gear 68.
When the handle 79 is rotated, the first and second shafts 15 and 31 can be manually rotated without using the electric motor 50.

Next, the operation of the diameter reducing and expanding device of the present embodiment will be described.

The can C is supplied from the shooter 77 to the diameter reducing device 1 and drawn by the diameter reducing device 1. Then, the drawn can C is supplied to the diameter expanding device 3 through the shooter 30, flanged by the diameter expanding device, and discharged from the flanged can C shooter 79.

When the electric motor 50 is rotated, the rotational displacement is transmitted to the first shaft 15 via the timing belt 52, the pulley 51, the timing belt 54 and the pulley 53, and the shaft 15 rotates. Then, since the first cam 18 and the second cam 19 are fixed to the shaft 15, the cams 18 and 19 rotate, and the cam followers 16 and 17 are advanced with this rotation. The outer die 10 and the inner die 11 connected to the cam followers 16 and 17 are advanced with a phase difference therebetween. The outer mold 10 and the inner mold 11 are fitted to the open ends of the cans C held by the pads 6, and the open ends are reduced in diameter.

Further, since the electric motor 50 is connected to the cylindrical member 20 of the conveying means 8 via the timing belt 52, the pulley 51, the shaft member 56, the gear box 58, the shaft member 59 and the index gear 64, the electric motor 50 is electrically driven. Motor 5
The cans C held by the plate-shaped member 21 are intermittently rotated during one rotation of 0, and the cans C are intermittently conveyed to the adjacent pads 6 while the diameter-reducing die 7 is retracted.

As described above, in the diameter reducing device 1 of this embodiment,
By arranging a plurality of diameter-reducing dies 7 along the conveying direction of the can C and advancing the plurality of diameter-reducing dies 7 at the same time, a plurality of stages of drawing processing are simultaneously performed in one stroke.

When the electric motor 50 is rotated, this rotational displacement is transmitted to the second shaft 31 via the timing belt 52, pulley 51, timing belt 54, pulley 53, pulley 69, timing belt 70 and pulley 71. , The shaft 31 is rotated. Since the die holder 34 is fixed to the shaft 31, the die holder 34 is rotated. Since the cam follower 43 is slidably engaged with the third cam 36 connected to the base 4, the cam follower 43 advances in conjunction with the rotation of the die holder 34, and the expansion following the expansion of the cam follower 43 is performed. The diameter die 35 moves forward to fit into the open end of the can C held by the pad 33, and the open end is expanded in diameter. At this time, the diameter-expanding die forming die 38 is rotated by the electric motor 73, and the diameter is smoothly expanded by this rotation.

In the diameter-reducing die 7, a phase difference is provided for advancing / retreating the outer die 10 and the inner die 11, so that interference between the inner die 11 and the can C is avoided during the drawing process, and the can is It is possible to prevent deformation of the open end of C.

In the diameter reducing device 1, the load cell 2
4, 25 are provided to detect the pressing force acting in the axial direction of the can C, the load cells 24,
Based on the pressing force of 25, it is possible to obtain processing information such as whether the can C is appropriately drawn.

Similarly, the diameter expanding device 3 is also provided with the load cell 45 to detect the pressing force acting in the axial direction of the can C. Therefore, based on the pressing force of the load cell 45, the can C can be detected. It is possible to obtain processing information such as whether or not the flange processing is appropriate.

In the diameter-reducing device 1 and the diameter-expanding device 3, since compressed air is filled in the inside of the can C during the drawing and the flange processing, the can C is pad 6 by the pressure of the compressed air. It is pressed against 33 and can C is compressed or compressed by the pressure of compressed air during flange processing.
Is prevented from being deformed. Furthermore, since the pressure of the compressed air acts on the diameter-reducing die 7 or the diameter-expanding die 35, the diameter-reducing die 7 or the diameter-increasing die 35 is used after the diameter-reducing or diameter-increasing.
Can be easily removed.

In the above-mentioned embodiment, four diameter reducing dies 7 are provided and the diameter of the cans C is reduced in four stages while the can C is being conveyed.
This corresponds to the current mainstream is 4-step necking, but it is expected that the diameter of the lid will be reduced due to the weight reduction of the lid attached to the can C. In this case, It is necessary to reduce the diameter by more than 4 steps. In such a case, the diameter reducing device 1 of the diameter reducing and expanding device of the present embodiment temporarily reduces the diameter in four stages, discharges it from the conveying path 2 before supplying it to the diameter expanding device 3, and reduces the diameter. Device 1 diameter reduction die 7
After replacing the can with a different one, the can C having the reduced diameter of four stages is passed through the reducing device 1 again to reduce the diameter of four or more stages.

[0050]

As described above, in the can diameter reducing and expanding device of the present invention, a diameter reducing device for sequentially drawing the open end of the can in multiple stages and a can discharged from the diameter reducing device. A diameter-reducing and expanding device for a can, which comprises a diameter-expanding device for performing flange processing on the opening end of the can and a conveying path provided between the diameter-reducing device and the diameter-expanding device, , A plurality of first holding portions arranged in one direction on the base to hold the bottom of the can, and the first holding portions provided on the base so as to face the first holding portions. A plurality of reducing dies that move forward toward the opening end of the can to reduce the opening end of the can in a multi-stage manner, a conveying unit that intermittently conveys the can to the adjacent first holding portion, and the reducing dies are advanced and retracted at the same time. A reducing die driving means for driving,
The diameter reducing die includes an outer die that fits on the outer peripheral side of the opening end of the can and an inner die that fits on the inner peripheral side of the opening end of the can, and the diameter reducing die driving means includes the outer die. Includes a rotatable first cam with which the inner mold is slidably engaged, and a rotatable second cam with which the inner mold is slidably engaged, and the diameter expanding device includes the base. A plurality of second holders rotatably arranged with respect to the bottom of the can, a die holder that rotates integrally with the second holders, and the die holder facing the second holders. A plurality of diameter-expanding dies that are attached to the second holder and advance toward the second holding portion to expand the opening end of the can; and the diameter-expanding die are interlocked with the rotation of the die holder and the second holding portion. And a third cam that moves forward and backward with respect to the die holder, and includes the first holding portion, the diameter-reducing die, and the second holding portion. Since the pressure detecting means for detecting the pressing force acting on these axially upon diameter and diameter are provided,

The device for reducing and expanding the diameter of the can can be made cheaper and simpler in structure than that provided on the can manufacturing line.

[Brief description of drawings]

FIG. 1 is a side view showing a can diameter reducing and expanding device according to an embodiment of the present invention.

FIG. 2 is a front view showing a diameter reducing and expanding device for a can according to an embodiment of the present invention.

FIG. 3 is a sectional view showing a diameter reducing device in a diameter reducing and expanding device for a can according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a diameter expanding device in a can diameter reducing and expanding device of one embodiment of the present invention.

FIG. 5 is a front view showing a drive system in a can diameter reducing / expanding device according to an embodiment of the present invention.

[Explanation of symbols]

 C can 1 diameter reducing device 2 conveying path 3 diameter expanding device 4 base 6 pad (first holding part) 7 diameter reducing die 8 conveying means 9 diameter reducing die driving means 10 outer die 11 inner die 18 first cam 19 2nd cam 33 Pad (2nd holding part) 34 Die holder 35 Expanding diameter die 36 3rd cam 24,25,45 Load cell (pressure detection means)

Claims (1)

[Claims] Claim: What is claimed is: 1. A diameter reducing device for sequentially drawing the opening end of a can in multiple stages, a diameter expanding device for performing flange processing on the opening end of the can discharged from the diameter reducing device, and the diameter reducing device and the expanding device. A diameter reducing and expanding device for a can having a conveying path provided between the diameter reducing device and the diameter reducing device, wherein the diameter reducing device is arranged in one direction and arranged on a base to hold a plurality of bottoms of the can. The first holding part and the first of these
A plurality of diameter-reducing dies that are provided on the base so as to face the holding portion of the can and move toward the first holding portion to reduce the open end of the can sequentially in multiple stages; A holding means is provided with a carrying means for carrying it intermittently, and a diameter-reducing die driving means for driving the respective diameter-reducing dies forward and backward at the same time. And an inner die fitted to the inner peripheral side of the open end of the can, wherein the diameter reduction die driving means includes a rotatable first cam with which the outer die is slidably engaged, and A second cam having an inner mold slidably engaged with the second cam, wherein the diameter expanding device is rotatably arranged with respect to the base and has a plurality of second cams for holding a bottom portion of the can. Holding parts, a die holder that rotates integrally with these second holding parts, and the second holding part.
A plurality of diameter-expanding dies that are attached to the die holder so as to face the holding portion of the die and advance toward the second holding portion to increase the diameter of the opening end of the can. A second cam that moves forward and backward with respect to the die holder in conjunction with the rotation of the second holding portion is provided, and the first holding portion, the diameter-reducing die, and the second holding portion have a diameter reduction and expansion. A diameter reducing and expanding device for a can, comprising a pressure detecting means for detecting a pressing force acting in the axial direction when the diameter is increased.