JPH0774043B2 - Cylinder feeding device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feeding device for feeding a cylindrical body such as an empty can that flows down in a close contact at a high speed at a high speed by expanding the cylindrical body at a predetermined pitch interval.

Conventional technology For example, in a can manufacturing line, a can body formed into a cylindrical shape is conveyed in close contact to a processing station such as a printing process. At the processing station, printing is performed with the can body being held at a fixed interval. Etc. are processed. 2. Description of the Related Art Conventionally, a rotating carrier having a constant-pitch holding pocket such as a star wheel has been widely used as a means for spreading cans that are continuously conveyed to a constant interval.

As a means for feeding a cylindrical body such as a can that is continuously conveyed in a close contact state to a continuous rotation conveyance vehicle, the following two methods are broadly adopted.

One such method is to provide a feed spiral that engages with a cylinder feed chute or conveyor to speed up and align the cylinders that are conveyed in continuous close contact at regular intervals while passing through the spiral and rotate synchronously. It is a method of sending it into the pocket of a rotating carrier. This method is widely used because of its simple structure and reliable transport. However, when the speed is high, the contact pressure of the spiral with respect to the transported object becomes high, and defects such as flaws and dents are likely to occur on the transported object. For example, in the case of transporting metal cans for canning, this method has a limit of about 800 cans per minute, and at a higher speed than that, the impact becomes large and various problems occur.

The other method is to use a spiral feeding chute or a conveyor directly with a rotary carrier without using a spiral, and to appropriately select the shape of the back curve connecting the pockets of the rotary carrier and the cylinder feed angle. The cylinder body is directly delivered to the pocket of the rotary transport vehicle. Among them, the one in which the cylindrical body in the cylindrical body supply chute is dropped by gravity is generally called a gravity feed mechanism, and for example, a Japanese Patent Publication No. 59-9444 is known.

Problems to be Solved by the Invention The gravity feed mechanism has an advantage in that the speed can be increased as compared with that using a spiral, but when delivering from the chute to the pocket of the rotary transport vehicle, It gives a shock to the cylindrical body, and in the worst case, it gets stuck between the pocket and chute of the rotary transport vehicle, resulting in clogging.
The cylindrical body had a defect that it was likely to have flaws or dents. In order to eliminate the above-mentioned drawbacks, various proposals have been made to improve the shape of the pocket and the back curve of the rotary transport vehicle and the cylindrical body feeding angle as in the above proposal. A gravity feed mechanism that has been completely eliminated has not yet been obtained.

The present invention has been made in view of the above situation,
To provide a cylindrical body feeding device that alleviates the impact on the cylindrical body when it is delivered to the pocket of a rotary transport vehicle, prevents the occurrence of flaws and dents on the cylindrical body, and enables stable feeding at extremely high speeds. That is the purpose.

Means for Solving the Problems In order to solve the above problems, as a result of various studies by the present inventor, as a cause of impact, all of the conventional ones are pockets of a cylindrical rotary carrier at the lower end of the supply chute. It was found that it was caused by the fact that the flow velocity to the pipe was not uniform and the cylinder had a pulsating structure. Based on this finding, the present invention succeeded in developing an inner curved structure of a rotary transport vehicle in which a cylindrical body flows down from a chute at a constant speed and is seated in a pocket, and the cause of pulsation can be eliminated.

The principle of the present invention for solving the above problems will be described with reference to FIG.

The back curve between the pockets of the rotary carrier for causing the cylindrical body to flow down from the supply chute at a constant speed when the rotary carrier rotates at a constant speed can be obtained as follows.

In the coordinate system in which the center of the rotary transport vehicle is the polar (0,0) of the curved coordinates, the straight line 4 connecting the center 2 of the pocket 1 at the seating point of the rotary transport vehicle and the axis 3 of the rotary transport vehicle has zero declination. , D = pocket diameter (equal to cylinder diameter) a = pocket pitch radius of rotating carrier τ = pocket pitch angle (360 ° / number of pockets) θ = counterclockwise to straight line 4 when an arbitrary angle at τ DEG from about 0 ° C., erected from the center W ₁ of the cylindrical body 6 into linear 4 Of length A, and Has a length B of A = d · sin ψ B = d · cos ψ, and the polar coordinate of the point W ₁ is: declination α = tan ⁻¹ {A / a + B)} radius Rw ₁ = {(a + B) ² + A ² } ^1/2 . Also, Of length C, The length H and the angle β are in the relationship of C = a · sin α H = (d ² −C ² ) ^1/2 β = tan ⁻¹ (C / H).

Therefore, when the rotary carrier rotates at a constant speed, the cylindrical body also flows down at a constant speed, and the speed should advance by a distance equal to the diameter d with respect to the rotation of the pitch of the rotary carrier. When the rotary transport vehicle rotates θ, the flow-down distance x of the cylindrical body is proportional to the rotation angle of the rotary transport vehicle, and x = d (θ / τ).

Therefore, since the line segment D and the line segment E in FIG. 1 are D = x · sinβ E = x · consβ, δ = tan ⁻¹ {D / Rw ₁ −E)} Therefore, the polar coordinate of the point Wx is Declination θwx = θ + α−δ Radial Rwx = {(Rw ₁ −E) ² + D ² } ^1/2 .

Now, the cylindrical body having a diameter d, which is seated in the pocket of the rotary transport vehicle from the chute, flows down into the pocket while being in contact with the back curve of the rotary transport vehicle.
Diameter around the point Wx when changes from 0 to τ
The envelope of the arc of the car on the side of the car must be the back curve between the seating pockets of the car. That is, the back curve is equal to the curve formed when the center of the cutter having the diameter d is controlled to the polar coordinate Wx to cut the outer shape of the rotary transport vehicle.

The feeding device of the present invention configured based on the above principle is a constant velocity feeding of a cylindrical body provided with a rotary carrier having a plurality of pockets at equal intervals in the periphery and a supply chute for feeding the cylindrical body into the pocket. In the apparatus, the lower end portion of the supply chute has an outer periphery of the rotary transport vehicle such that the cylindrical bodies are adjacent to each other in a parallel state to the axis of the rotary transport vehicle and guide downwardly toward the rotary transport vehicle. Is inclinedly arranged at an arbitrary feeding angle ψ close to the portion, and each pocket of the rotary transport vehicle has a seating arc having a diameter d substantially equal to the diameter of the cylinder to be transported, and the center of the arc. Are arranged at equal intervals on the pitch circle of the rotary transport vehicle, and each seating arc is connected to the seating arc outside the pitch circle, and when seated, the seating arcs are connected to the seating arcs of the adjacent pockets that are subsequent to the seating arc. Within the pitch circle Are connected in the rear curve connecting, said back curve, the point W ₁ of the axis of the cylinder positioned in the feed chute bottom in contact with the outer peripheral surface of the cylindrical body seated in the pocket, of the seating arc A constant velocity is applied from the point W ₁ to the center point P _{1 of the} seating arc while the rotary carrier rotates one pitch (360 ° divided by the number of pockets n) on a straight line connecting the center points P. It is characterized in that it is an envelope of a circle having a diameter d centered on a point Wx which moves at.

The back curve connecting the adjacent pockets of the rotary transport vehicle is the point W ₁ of the axis of the cylindrical body located at the lower end of the chute arranged at the arbitrary feeding angle ψ which is in contact with the outer peripheral surface of the cylindrical body seated in the pocket, On the straight line connecting the center points of the seating arcs, the rotary carrier moves in the direction of the point P at a constant speed over a distance d equal to the diameter of the cylinder from the point W _{1 of the} cylinder while the rotary carrier rotates one pitch. Since it is formed on the envelope of a circle having a diameter d centering on the point Wx, as long as the rotating cylinder rotates at a constant speed, the cylinder flows down on the chute at a constant speed and is seated in the pocket. Therefore, even if the rotary carrier rotates at a high speed, the cylindrical body is seated in the pocket without pulsating, the cylindrical body does not receive an impact, and even if the can is easily dented, such as an aluminum can, it has a dent. It is sent smoothly without attaching.
Further, the angle of the feeding chute with respect to the pocket can be arbitrarily selected in a wide range, and the installation space can be flexibly dealt with.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows an embodiment of the feeding device of the present invention made based on the above principle. The feeding device shown in the figure has an angle of the chute 12 with respect to the pocket 11 of the rotary transport vehicle 10, that is, the feeding angle ψ of 22.5 °, the number n of the pockets 11 is 6, the radius a of the pitch circle is 100 mm, and the pocket arc. Radius of
The back curve 4 was obtained based on the above principle under the condition of / 2 being 24 mm.

Further, in the embodiment, the portion where the seating arc 13 of the pocket 11 of the rotary transport vehicle 10 and the back curve 14 are connected outside the pitch circle
15 is formed by rounding the tip in an arc shape. The part 15
In order to receive the cylinder without pulsating the cylinder in the chute 12 and to securely hold the cylinder in the pocket during rotation of the rotating body, the radius of is 5 minutes of the radius of the seating arc 13. 1 or less is preferable. The rotary transport vehicle configured as described above can be formed to be thick in the axial direction to feed a cylindrical body with only one, but a plurality of thin plates are formed,
The pockets may be fixed to the rotating shaft 16 at intervals in the axial direction so as to match the pitch phase of the pockets. In addition, 17 is a guide.

The back curve 14 can be obtained graphically as shown in FIG.

A pitch circle 20 having a radius a is drawn, and a point on the pitch circle obtained by equally dividing the pitch circle 20 by the number of pockets n is the center point 21 of the seating arc of the pocket 11. A circle 22 having the same diameter as the diameter d of the cylindrical body is drawn around the center point 21, and a chute axis 25 having a feed angle ψ is seated on a straight line 24 connecting the center point 21 and the pitch circle center point 23. Pull outward from the center point 21. And
Draw a circle 26 on the chute axis 25 in contact with the circle 22 having the diameter d. The circle 26 represents the lowermost cylindrical body which continuously flows down in the chute in a close state, and the circle 22 is completely in the pocket. It represents a cylinder at the moment of sitting.

From this state, when the rotating south carrier with the pitch circle diameter a rotates clockwise at a constant speed, in order for the rotating body in the shout to flow down the chute at a constant speed, the rotating carrier must have a temperature of 360 ° C / n. By the rotation, that is, by rotating the pocket pitch angle τ degrees and the upstream pocket is located on the chute axis, the rotating body at the lowermost end of the chute moves at a constant speed over the distance d from the center point 27 to the point 21. Must. That is, the rotating carrier is τn / m
When rotating an angle, the center of the cylinder inside the chute is the point
You have to run d / m from 27 towards point 21.

Therefore, each straight line drawn by the angle ψ from the intersection points P ₁ , P ₂ , P ₃ ... Of the straight line obtained by dividing the pitch angle τ into m and the pitch circle is connected between the points 27 and 21 of the straight line 25. The point S ₁ that divides the straight line into m equal parts,
Draw a circle of diameter d centered on the points W ₁ , W ₂ , W ₃ ... At which the arcs centered on the pitch circle center 23 passing through S ₂ , S ₃ ... The envelope curve on the side intersecting the pitch circle is the back curve 14 of the rotary carrier.

FIG. 4 shows another embodiment of the rotary carrier. In this embodiment, the feed-in angle of the cylindrical body, that is, the shoot angle ψ is 60 degrees, and the number of pockets is 6 as in the above-mentioned embodiment.

As described above, according to the present invention, the angle of the feeding chute can be arbitrarily set within a very wide range. However, if the angle is too small, the sent-in cylindrical body and the flowing-down cylindrical body interfere with each other. Therefore, it is necessary to set the angle of the chute above the limit at which the interference does not occur.

Effect The cylindrical constant velocity feeding device of the present invention is configured as described above, and since the cylindrical body flows down through the chute at a constant velocity and is seated in the pocket of the rotary carrier, the rotary carrier rotates at a high speed. However, the pulsation of the cylindrical body is prevented. Therefore, the cylindrical body does not receive an impact, and even a flexible can such as an aluminum can can be smoothly fed without any dent or flaw. As a result, it is possible to feed aluminum cans to the printing station on the body at a high speed of 1400 cans per minute or more, which greatly contributes to a dramatic increase in the speed of the can making line. Also, since the angle of the feeding chute with respect to the pocket can be set arbitrarily within a wide range, it is possible to flexibly correspond to the installation space, etc.
It has many advantages.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing the principle of the present invention, FIG. 2 is a schematic side view of an embodiment of a constant velocity feeding device for a cylindrical body according to the present invention, and FIG. 3 is a rotary transport vehicle of FIG. Fig. 4 is a schematic side view of another embodiment, and Fig. 4 shows a schematic side view of another embodiment. 1, 11: Pocket, 6: Cylindrical body, 10: Carrying vehicle, 12: Supply chute, 13: Seating arc, 14: Rear Curve, 20: Pitch circle

Claims (2)

[Claims] 1. A constant velocity feeding device for a cylindrical body, comprising: a rotary carrier having a plurality of pockets at equal intervals around the periphery thereof; and a supply chute for feeding the cylindrical body into the pocket. So that the lower ends thereof are adjacent to each other in a state parallel to the axis of the rotary transport vehicle toward the rotary transport vehicle and their lower ends are close to the outer peripheral portion of the rotary transport vehicle. And each pocket of the car has a seating arc with a diameter d substantially equal to the diameter of the cylinder being conveyed, the center of the arc being on the pitch circle of the car. Placed at intervals,
Each seating arc is connected to the seating arc on the outside of the pitch circle, and is connected by a back curve connecting to the seating arcs of the adjacent pockets that follow when rotating, inside the pitch circle. , The back curve is a straight line connecting a point W ₁ of the axial center of the cylindrical body located at the lower end of the supply chute, which is in contact with the outer peripheral surface of the cylindrical body seated in the pocket, and a center point P of the sitting arc, A diameter centered on a point Wx that moves at a constant speed from the point W ₁ to the center point P _{1 of the} seating arc while the rotary carrier rotates one pitch (360 ° divided by the number of pockets n). A cylindrical body feeding device, which is an envelope of a circle of d. 2. A portion where the seating arc and the back curve of the rotary transport vehicle are connected to each other outside the pitch circle is formed into a circular arc having a radius of one fifth or less of the radius of the seating arc. The cylindrical body feeding device according to claim 1, wherein