JPH0443758B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cutting device for plastic containers.

Conventional technology Conventionally, the conical head of a plastic container, which is necessary when forming the mouth and stretched portion of a plastic container, but is unnecessary when the container is used, has been cut using a rotary cutter or a laser beam. and so on.

Problems to be Solved by the Invention By the way, when the container head is cut off using the conventional method described above, the following problems occur when the container is for beverages or food.

That is, when using a rotary cutter, cutting powder and thread-like cutting waste are removed, and when using a laser beam,
During fusing, steam from the base material, assist gas, etc. entered the container and were affected by static electricity, making it very difficult to remove, and the cut surface was not beautiful.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a plastic container cutting device that can solve the above problems.

Means for Solving the Problem In order to solve the above problem, the plastic container cutting device of the present invention fixes upper and lower support plates to the upper and lower parts of the rotary drive shaft, respectively, and attaches the first shaft body to the lower support plate. a first cam roller is provided at the lower end of the first shaft, a receiving plate for the container is attached to the upper end, and the first cam roller is guided along the locus of movement of the first shaft. A first cam body is provided for raising and lowering the receiving plate, and a second shaft body is provided upright on the side of the receiving plate, and the second shaft body is swingable in a horizontal plane to hold and release the container. A pair of clamp arms is attached, and a second cam body is provided on the lower support plate side to swing the pair of clamp arms when the receiving plate is raised and lowered via a second cam roller attached to the end of the clamp arms. The upper support plate holds a third shaft having a pressing member at its lower end that presses the head of the container downward, and is capable of holding the head of the container around the lower end of the third shaft. A plurality of chuck bodies are supported swingably in a vertical plane, a first cylindrical body is fitted onto the third shaft so as to be movable up and down, and the outer periphery of the chuck bodies is pressed against the lower end of the first cylindrical body. forming a possible pressing part, and
A first cylinder device is connected to the upper end of the cylinder for lifting and lowering the first cylinder to urge the chuck body toward the container, and a second cylinder is rotatably fitted onto the first cylinder. A first gear is attached to the upper end of the second cylindrical body, and a swinging arm is supported around the lower end of the second cylindrical body so as to be swingable in a vertical plane via an intermediate part of the swinging arm. A knife for cutting the head of the container is attached to the lower end of the arm, a third cam roller is attached to the upper end, and a cylindrical cam body is fitted onto the second cylindrical body so as to be movable up and down, and a knife is attached to the support plate side. A second cylinder device for raising and lowering the cylindrical cam body is provided, and on the outer peripheral surface of the cylindrical cam body, when the cylindrical cam body is raised and lowered,
A cam surface is formed that guides a third cam roller of the swinging arm to move the knife at the lower end toward and away from the container, and meshes with a first gear attached to the second cylindrical body on the upper support plate. The second gear is swingably provided,
and the second shaft along the movement locus of the third shaft body.
A third cam body is provided to swing the gear via a fifth cam roller.

Operation When the receiving plate comes to a predetermined container supply section while the rotary drive shaft is rotating at a predetermined speed, a container with a head is placed on the receiving plate. At this time, the receiving plate is in a lowered position by the first cam body.
As the receiving plate rotates in a predetermined direction, the first
The receiving plate is raised by the cam body. As the receiving plate rises, the clamp arm is closed by the second cam body to hold the container. In this state, when the receiving plate is further raised, the upper end of the container head comes into contact with the pressing member at the lower end of the third shaft, and the container is held under pressure between the receiving plate and the pressing member, and then the container is held pressed between the receiving plate and the pressing member. The first cylindrical body is lowered by the cylinder device, the chuck body is swung, and the container is securely held fixed. When the container is held fixed, the cylindrical cam body is lowered by the second cylinder device and the swinging arm swings outward,
A knife is inserted into the container where the head is cut. When the knife is inserted, the second cylindrical body, that is, the knife, is rotated by a predetermined angle by the third cam body to cut off the container head. When the head is completely cut off, the receiving plate is lowered by the first cam body, the clamp arm is released by the second cam body, and the container is discharged from the discharge section. On the other hand, at the cutting part,
As the knife is moved outward, the chuck body is released and the head is ejected in place.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. This cutting device can be broadly divided into plastic containers (hereinafter simply referred to as containers).
It is divided into 1 holding part A and cutting part B, and 1
They are arranged at the top and bottom around the shaft of the book, but due to size reasons, FIGS. 1 to 3 show the lower holding part A, and FIGS. 4 and 5 show the lower holding part A. Upper cut B is shown.

First, the holding portion will be explained based on FIGS. 1 to 3.

Reference numeral 2 denotes a vertical rotary drive shaft rotatably supported on a predetermined support base 3 via a support tube 4, and is rotated by a drive gear 5 attached to the lower end thereof. Reference numeral 6 denotes a lower support plate fixed to a lower position of the rotary drive shaft 2, and is used to support the main devices of the holding section A. Note that a pair of holding portions A are provided at 180° symmetrical positions with respect to the rotary drive shaft 2, but in this embodiment, only one will be explained. Reference numeral 7 denotes a first shaft body supported by the lower support plate 6 so as to be vertically movable; a receiving plate 8 of the container 1 is fixed to the upper end thereof, and a horizontal pin 9 is attached to the lower end thereof.
The first ascending and first descending cam rollers 1
0 and 11 are attached. 12 and 13 are a first ascending cam body and a first descending cam body provided on the support base 3 side along the movement locus of the first shaft body 7;
The first ascending and first descending cam roller 10,
11 to raise and lower the first shaft 7, that is, the receiving plate 8. In addition, 14 is the lower support plate 6
A guide body provided hanging down on the lower surface, in which the head 9a of the horizontal pin 9 for attaching the first cam rollers 10, 11 at the lower end of the first shaft body 7 is inserted into the guide groove 14a.
is inserted and guided to prevent rotation of the receiving plate 8. Reference numeral 15 denotes a clamping tool for the container 1 provided on the receiving plate 8, and is adapted to hold or release the container 1 on the receiving plate 8 as the receiving plate 8 moves up and down. That is, a pair of left and right second shafts 16 are provided on the protrusion 8a that protrudes in the vertical direction from the end of the receiving plate 8.
A, 16B are rotatably supported, and at the upper position of each of these second shafts 16A, 16B,
A pair of left and right upper clamp arms 17A, 17B
However, a pair of left and right lower clamp arms 18A and 18B are respectively pinned at the lower position.
Furthermore, a protrusion 20 on the opposite side of the holding recesses 19A, 19B of the upper clamp arms 17A, 17B
A and 20B are provided with a pair of tension springs 21A and 21B so as to pull the protrusions 20A and 20B together.
are hung in an X-shape. Therefore, by the tension springs 21A, 21B, the upper and lower clamp arms 17A, 17B, 18A, 18B are always
This means that the container 1 is biased in the direction of being released. Further, a protrusion 23 on the opposite side of the holding recesses 22A, 22B of the lower clamp arms 18A, 18B
A, 23B are attached with second cam rollers 24A, 24B, and this second cam roller 24
A second cam plate 25 that swings the left and right clamp arms 17A, 17B, 18A, 18B in a direction to hold each other together when the receiving plate 8 is raised via A, 24B.
is erected on the lower support plate 6 (see FIG. 3). Therefore, when the receiving plate 8 is in the lower position,
Since the second cam rollers 24A, 24B are close to each other, each clamp arm 17A, 17B, 1
Holding parts 19A, 19B, 22A of 8A, 18B,
22B are spaced apart from each other and the container 1 is in an open state. Also, as the receiving plate 8 rises, the second
The cam rollers 24A and 24B are mutually connected to the second cam plate 2.
5, and the respective holding parts 19A,
19B, 22A, and 22B are swung in a direction to hold the container 1, and in the raised position, the container 1 is securely held. Note that 26A and 26B are a pair of left and right fixed guides for positioning the container 1 provided in the middle part of the receiving plate projection 8a, and 27 are holding recesses 22A and 22 of the lower clamp arms 18A and 18B.
B is a friction member for preventing rotation of the container 1 attached to the inner surface.

Next, the cutting portion B will be explained based on FIGS. 4 and 5. Note that this cutting section B is arranged above the above-mentioned holding section A, and in this case as well, a pair of cutting sections B are provided at 180° symmetrical positions, but only one will be explained.

Reference numeral 31 denotes an upper end support plate provided at the upper end of the rotary drive shaft 2, and is used to support the entire cutting section B. A third shaft 32 is vertically supported by the upper support plate 31 via a bracket 33 and a support pin 34 at a position above the first shaft 7 of the holding part A, and the head of the container 1 is attached to the lower end of the third shaft. A plunger (pressing member) 35 is attached to press 1a downward. That is, a hole 32a is formed at the lower end of the third shaft 32, and the plunger 35 is slidably inserted into the hole 32a, and the plunger 35 is always projected downward into the hole 32a. A compression spring 36 is disposed to bias it. Reference numeral 37 denotes a chuck body that is swingably supported in a vertical plane via a ball body 38 at multiple locations around the lower end of the third shaft body 32, and a chuck body is provided at the lower end of the chuck body so as to hold the area around the container head 1a. Arc-shaped convex portion 37
A is provided. Also, 39 is the chuck body 3
7 and a cap 40 for holding the ball body 32 on the third shaft body 32 side, and is used to always urge the chuck body 37 outward. Reference numeral 41 denotes an operating tool that presses the chuck body 37 from the outside to hold the container head 1a, and a first cylindrical body 42 is externally fitted on the third shaft body 32 so as to be movable up and down.
a cylindrical pressing member 43 that is attached to the lower end of the first cylindrical body 42 and has an inclined surface 43a for pressing the outer peripheral surface of the chuck body 37 inward; and a bracket provided on the upper support plate 31. 32 and connected to the upper end of the first cylinder 42 to move the first cylinder 42 up and down with respect to the third shaft 32. Therefore, when the first cylindrical body 42 is lowered by the first cylinder device 44, the chuck body 37 is pushed inward by the inclined surface 43a and holds the upper end of the container head 1a, and the first cylindrical body 42 When the chuck body 37 is raised, the pressure on the chuck body 37 is released, and the chuck body 37 is opened outward by the urging force of the rubber ring 39, and the container head 1a is released. In addition,
Reference numeral 45 denotes a cylindrical guide member screwed onto the outer periphery of the lower part of the cylindrical holding member 43, and is for guiding the container head 1a. Reference numeral 51 denotes a cutting tool for cutting the head 1a of the container 1 held by the chuck body 37, and is supported on the upper support plate 31 via a bearing 52 and rotatably around the outer circumference of the third shaft body 32. The intermediate portion of the second cylindrical body 53 is supported via a horizontal shaft 54 at four positions around the lower end of the second cylindrical body 53, and a knife 55 for cutting the container head 1a is attached to the lower end. and a swinging arm 57 with a third cam roller 56 attached to its upper end; one end of the swinging lever 57 is connected to the third cam roller 56 side, and the other end is connected to the second cylindrical body 53 side, i.e. The knife 55 is always connected to its mounting member 70.
A tension spring 58 biases the swinging arm 57 so that it is positioned outward, and a tension spring 58 is fitted on the outer periphery of the second cylindrical body 53 so as to be movable up and down, and guides the third cam roller 56 in contact with the lower outer periphery thereof. A cylindrical cam body 59 has an inclined cam surface 59a and an annular cam groove 59b formed on the outer periphery of the upper part. The fourth cam body 59 is rotatable in the cam groove 59b of the cam body 59.
Swing lever 62 with cam roller 61 attached
A second cylinder device 63 is fixed to the upper support plate 31 and moves the intermediate portion of the swing lever 62 up and down to raise and lower the cylindrical cam body 59; ring gear (first
gear) 64 and a fourth shaft body 65 on the upper support plate 31.
A fan-shaped gear (second gear) 66 is swingably supported in a horizontal plane through the ring gear 64 and meshed with the ring gear 64; A tension spring 7 whose end is locked to a spring receiver 72 on the upper surface of the upper support plate 31 to pull the sector gear 66 in a predetermined direction.
3, a driving arm 68 whose one end is interlocked with the fan-shaped gear 66 via the fourth shaft 65 and a fifth cam roller 67 is attached to the other end, and the movement locus of the third shaft 32. and a third cam body 69 that is arranged along the cam body and guides the fifth cam roller 67 to swing the sector gear 66. Therefore, when the swing lever 62 is swung downward by the first cylinder device 63, the cylindrical cam body 59 is lowered via the fourth cam roller 61, and the swing arm 57 is lowered via the third cam roller 56. swings outward and a knife 5 attached to its lower end
5 moves to the container 1 side. In addition, the third cam body 69
When the driving arm 68 is swung by the
3 is rotated, that is, the knife 55 is rotated around the container 1 at a predetermined angle. At this time, the cylindrical cam body 5
9 also rotates together, but there is no problem because the engagement with the swing lever 62 is achieved by the cam groove 59b and the fourth cam roller 61 rolling within the cam groove 59b. Although not shown, on the upper support plate 31 are the first and second cylinder devices 4.
A plurality of limit switches are provided for controlling the third shaft 32, and these limit switches are operated by a striker (not shown) disposed along the movement locus of the third shaft 32.

Next, the effect will be explained.

First, in a state where the rotary drive shaft 2 is rotating at a predetermined speed, when the receiving plate 8 comes to a predetermined container supply section, the container 1 with the head 1a is received by a supply device (not shown, but for example, a star wheel). It is placed on the plate 8. At this time, the receiving plate 8 is
3 in the lowered position. and,
As the receiving plate 8 rotates in a predetermined direction, the receiving plate 8 is raised by the first cam bodies 12 and 13. As the receiving plate 8 rises, the clamp arms 17A, 17B, 18A, and 18B are closed by the second cam body 25 to hold the container 1. In this state, when the receiving plate 8 is further raised, the upper end of the container head 1a comes into contact with the plunger 35 at the lower end of the third shaft 32, and the container 1 is held under pressure between the receiving plate 8 and the plunger 35. After that, the first cylindrical body 42 is lowered by the first cylinder device 44 and the chuck body 37 is swung, so that the container 1 is securely held fixed. When the container 1 is held fixed, the cylindrical cam body 59 is lowered by the second cylinder device 63 and the swing arm 57
swings outward, and the knife 55 touches the head 1a of the container 1.
Insert into the cut point. When the knife 55 is inserted, the second cylindrical body 53, that is, the knife 55 is rotated by a predetermined angle by the third cam body 69, and the container head 1a is rotated by a predetermined angle.
is disconnected. Note that the rotation angle of the knives 55 at this time is determined by the number of knives 55; for example, when there are four knives 55, the rotation angle of the knives 55 is at least 90 degrees or more. When the head 1a is completely cut off, the receiving plate 8 is lowered by the first cam bodies 12, 13, and the clamp arms 17A, 17B, 18A, 18B are released by the second cam body 25, and are placed in a predetermined position. The container 1 is evacuated by means of an arranged evacuation device (for example a star wheel). On the other hand, at the cutting section B, after the knife 55 is moved outward and the chuck body 37 is released,
At a predetermined position, the head 1a is ejected by the plunger 35 onto, for example, a chute (not shown). Note that each of the above operations is performed while the container 1 rotates once around the rotary drive shaft 2.

Effects of the Invention According to the above configuration of the present invention, a rotary cutter and a laser beam as in the prior art are used to insert a knife into the cut point of the container head and rotate the knife to cut off the unnecessary head. It has the advantage of producing fewer chips and gas than conventional cutting tools, and also provides a more beautiful cut surface.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a partially cutaway side view of the holding part, FIG. 2 is a partially cutaway plan view of FIG. 1, and FIG. 3 is a perspective view of the second cam body. 4 is a partially cutaway side view of the cut portion, and FIG. 5 is a partially cutaway plan view of FIG. 4. DESCRIPTION OF SYMBOLS 1... Container, 1a... Head, 2... Rotation drive shaft, 6...
Lower support plate, 7... First shaft body, 8... Reception plate, 10, 1
1...first cam roller, 12, 13...first cam body,
15... Clamp tool, 16A, 16B... Second shaft body,
17A, 17B... Upper clamp arm, 18A,
18B...lower clamp arm, 21A, 21B...
Tension spring, 24A, 24B...Second cam roller, 2
5...Second cam plate, 31...Upper support plate, 32...Third
Shaft body, 35... plunger (pressing member), 36... compression spring, 37... chuck body, 39... rubber ring,
41... Operating tool, 42... First cylindrical body, 43... Cylindrical pressing member (pressing part), 44... First cylinder device, 5
1... Cutting tool, 53... Second cylindrical body, 55... Knife, 5
6... Third cam roller, 57... Swinging arm, 58...
Tension spring, 59... Cylindrical cam body, 59a... Inclined cam surface, 59b... Cam groove, 61... Fourth cam roller, 6
2... Swing lever, 63... Second cylinder device, 6
4...Ring gear (first gear), 66...Sector gear (second gear), 67...Fifth cam roller, 69...Third
Cam body.

Claims (1)

[Claims] 1. Upper and lower support plates are respectively fixed to the upper and lower parts of the rotary drive shaft, and a first shaft body is provided on the lower support plate so as to be movable up and down, and a first shaft body is attached to the lower end of the first shaft body.
A cam roller is provided and a receiving plate for the container is attached to the upper end, and the first shaft is moved along the movement locus of the first shaft.
A first cam body is provided that guides the cam roller to raise and lower the receiving plate, and a second shaft body is provided upright on the side of the receiving plate, and the second shaft body is configured to be able to swing freely in a horizontal plane. A second cam body is attached to the lower support plate, which swings the pair of clamp arms when the receiving plate is raised and lowered, through a second cam roller attached to the end of the clamp arms. A third shaft is provided on the upper support plate and has a pressing member at its lower end that presses the head of the container downward, and the head of the container is held around the lower end of the third shaft. A plurality of chuck bodies that can be held from the periphery are supported swingably in a vertical plane, and the third
A first cylindrical body is fitted onto the shaft so as to be movable up and down, and a pressing portion capable of pressing the outer periphery of the chuck body is formed at the lower end of the first cylindrical body. A first cylinder device for lifting and lowering the cylinder to urge the chuck body toward the container is connected, and a second cylinder is rotatably fitted onto the first cylinder, and the second cylinder is rotatably fitted onto the first cylinder.
A first gear is attached to the upper end of the cylindrical body, a swinging arm is supported around the lower end of the second cylindrical body so as to be swingable in a vertical plane via its intermediate part, and the lower end of the swinging arm is A knife for cutting the head of the container is attached to the upper end, a third cam roller is attached to the upper end, a cylindrical cam body is fitted onto the second cylindrical body so as to be able to rise and fall, and a cylindrical cam is attached to the upper support plate side. A second cylinder device for raising and lowering the body is provided, and a cam is provided on the outer circumferential surface of the cylindrical cam body to guide the third cam roller of the swinging arm and move the knife at the lower end toward and away from the container when the body is raised and lowered. a second gear is swingably provided on the upper support plate and meshes with the first gear attached to the second cylindrical body; A plastic container cutting device characterized in that a third cam body is provided for swinging the second gear via a fifth cam roller.