JP6789052B2 - Reciprocating linear motion mechanism and can molding equipment - Google Patents

Description

The present invention relates to, for example, a reciprocating linear motion mechanism used for manufacturing a DI can, which converts a rotary motion input from the outside of the mechanism into a reciprocating linear motion and outputs the rotary motion to the outside of the mechanism, and a can forming apparatus using the same.

As a can body filled and sealed with contents such as beverages, a bottomed tubular DI can having a can body (wall) and a can bottom (bottom) and a disk wound around the open end of the DI can. Two-piece cans with a shaped can lid and are known. Further, a bottle can in which a DI can is necked, screwed, or the like and a cap is screwed to the open end thereof is also well known.

The DI can used for such a can body is a bottomed cylinder obtained by subjecting a disk-shaped blank punched from a plate material such as an aluminum alloy material to a cutting process (squeezing process) and a DI process (squeezing ironing process). It is formed in a shape.

Specifically, in the cupping step, the blank is cupped (drawing) to form a cup-shaped body which is a molding intermediate in the process of transferring from the blank to the DI can. Further, in the DI step, a punch sleeve is fitted inside the cup-shaped body, and a plurality of dies are fitted outside, and the cup-shaped body is squeezed and ironed between them. That is, the cup-shaped body is subjected to DI (Drawing & Ironing) processing to obtain a DI can.

As a can molding apparatus that performs DI processing on a cup-shaped body to form a DI can, for example, those described in the following Patent Documents 1 and 2 are known.
The can forming apparatus of Patent Documents 1 and 2 has a large gear on which internal peripheral teeth are formed and a pitch circular diameter having the same diameter as the pitch circular radius of the large gear, and meshes with the internal peripheral teeth of the large gear. A small gear that moves along the large gear of the lever, a drive mechanism that is connected to the small gear and revolves the small gear around the axis of the large gear, and a rotatably provided on the pitch circle of the small gear. It consists of a punch and a gear.
Then, in a state where the small gear having the same pitch circular diameter as the pitch circular radius of the large gear is meshed with the inner peripheral teeth of the large gear, the small gear is centered on the axis of the large gear by a drive mechanism. When it revolves, the small gear rotates with the rotation, and one point on the pitch circle of the small gear draws a trajectory that reciprocates on the diameter of the pitch circle of the large gear. As a result, the pitch circle of the small gear is drawn. A punch rotatably provided at the upper point moves in a reciprocating linear motion.

Japanese Unexamined Patent Publication No. 6-71351 Japanese Unexamined Patent Publication No. 6-71352

However, the above-mentioned conventional can molding apparatus has the following problems.
The can forming apparatus is provided with a punch drive mechanism (reciprocating linear motion mechanism) for reciprocating linear motion of the punch (punch sleeve). Various bearings used in this reciprocating linear motion mechanism were susceptible to heat generation and vibration due to a load (reaction force) during operation of the device. For this reason, the amount of coolant used for cooling and lubricating the bearing has to be increased, which has affected the life of the bearing. Further, when the bearing receives a large load, the fluctuation of the power consumption of the reciprocating linear motion mechanism becomes large, which affects the accuracy of the reciprocating linear motion output to the outside of the mechanism.

The present invention has been made in view of such circumstances, and can reduce the load on the bearing used in the reciprocating linear motion mechanism, suppress fluctuations in power consumption to a small extent, and output the reciprocating linear line to the outside of the mechanism. It is an object of the present invention to provide a reciprocating linear motion mechanism capable of improving the accuracy of motion, and a can forming apparatus using the same.

The reciprocating linear motion mechanism according to one aspect of the present invention is supported by a mechanism frame having an internal tooth gear on the inner peripheral surface and the mechanism frame rotatably around a first central axis coaxial with the internal tooth gear. A first rotating body having an external tooth gear on its outer peripheral surface that is rotatably supported by the first rotating body and meshes with the internal tooth gear so as to be rotatable around a second central axis separated in parallel with the first central axis. The two rotating bodies, the acting portion provided on the second rotating body and reciprocating linearly along a predetermined direction among the first radial directions orthogonal to the first central axis, and the first rotating body are provided. A first weight portion and a second weight portion provided on the second rotating body are provided, and the reciprocating linear motion mechanism viewed from the first central axis direction is viewed in front of the first radial direction. Among them, with respect to the first central axis and the first symmetric axis passing through the second central axis, the first weight portion is formed in a line-symmetrical shape, and the reciprocating linear motion mechanism seen from the first central axis direction. When viewed from the front, the first weight portion is characterized in that first balance processing portions extending in an inclined manner with respect to the first symmetry axis are formed at both ends in a direction perpendicular to the first symmetry axis. And.
Further, the reciprocating linear motion mechanism according to one aspect of the present invention is supported by the mechanism frame having an internal gear on the inner peripheral surface and the mechanism frame rotatably around the first central axis coaxial with the internal gear. An external gear that is rotatably supported by the first rotating body and meshes with the internal gear on the outer peripheral surface is rotatably supported around the second central axis that is parallel to the first central axis. The second rotating body having the body, the acting portion provided on the second rotating body and linearly reciprocating along a predetermined direction in the first radial direction orthogonal to the first central axis, and the first rotating body. The second center is provided with a first weight portion provided and a second weight portion provided on the second rotating body, and is viewed from the front of the reciprocating linear motion mechanism as viewed from the second central axis direction. Of the second radial direction orthogonal to the axis, the second weight portion is formed in a line-symmetrical shape with respect to the second central axis and the second symmetric axis passing through the center of the action portion, and the second central axis direction. A second balance machined portion extending at both ends of the second weight portion in a direction perpendicular to the second symmetry axis at an angle with respect to the second symmetry axis when viewed from the front of the reciprocating linear motion mechanism. Are each formed.
Further, in the can molding apparatus according to one aspect of the present invention, the reciprocating linear motion mechanism described above, the punch sleeve connected to the acting portion of the reciprocating linear motion mechanism, and the through hole through which the punch sleeve is inserted are formed. The die is provided with a cup holder sleeve that is inserted into the cup-shaped body arranged on the end face of the die through which the through hole opens and presses the bottom wall of the cup-shaped body against the end face to fix the die. It is characterized by that.

In the reciprocating linear motion mechanism and the can forming apparatus of the present invention, when the rotational driving force around the first central axis is transmitted from the outside of the mechanism to the first rotating body, the first rotating body moves to the first center with respect to the mechanism frame. It can be rotated around the axis. When the first rotating body is rotated around the first central axis, the second rotating body supported by the first rotating body is also rotated around the first central axis.

At this time, since the external gear of the second rotating body and the internal gear of the mechanism frame are in mesh with each other, the second rotating body is rotated (revolved) around the first central axis while being rotated (revolved) around the first central axis. It can also be rotated (rotated) around the axis. In addition, in the front view of the reciprocating linear motion mechanism viewed from the first central axis direction (which may be paraphrased as the second central axis direction; the same applies hereinafter), the direction of rotation in which the second rotating body is revolved around the first central axis. , The rotation directions that are rotated around the second central axis are opposite to each other.

As a result, the working portion provided on the second rotating body moves in a reciprocating linear motion along a predetermined direction (for example, the horizontal direction) in the first radial direction orthogonal to the first central axis. That is, the reciprocating linear motion mechanism of the present invention converts the rotational driving force (rotational motion) input to the first rotating body from the outside of the mechanism into the reciprocating linear driving force (reciprocating linear motion), and the mechanism via the acting unit. Output to the outside.
Therefore, by connecting the punch sleeve to this action portion, the punch sleeve can be reciprocated and linearly moved in a predetermined direction, and the cup-shaped body is subjected to DI processing using the punch sleeve, die, cup holder sleeve and the like. Can be molded into a DI can.

In the present invention, the first rotating body is provided with the first weight portion, and the second rotating body is provided with the second weight portion. The first weight portion and the second weight portion are used as so-called counter weights.
Therefore, when the first rotating body and the second rotating body are rotated around the first central axis and the second rotating body is rotated around the second central axis with respect to the mechanism frame, the first By the balancing action of the 1st weight portion and the 2nd weight portion, the weight balance of the 1st and 2nd rotating bodies can be maintained in a good state.

Specifically, for example, in the front view of the reciprocating linear motion mechanism, the center of gravity of the first rotating body and the second rotating body as a whole is set in the first radial direction over one rotation (entire circumference) around the first central axis. Of these, it can be arranged close to a virtual straight line extending in a predetermined direction (that is, the stroke locus of the acting portion) or can be arranged close to the first central axis. Further, the center of gravity of the second rotating body can be arranged close to the second central axis over one rotation (entire circumference) around the second central axis.
In setting the position of the center of gravity, for example, it can be obtained by analysis using three-dimensional CAD software, spreadsheet software, or the like. At this time, the first weight portion and the second weight while checking the position of the center of gravity at each predetermined angle around the first central axis when the reciprocating linear motion mechanism operates (for example, every 1 ° over the entire circumference of 360 °). By adjusting each shape of the portion, the balance function can be improved over the entire circumference around the first central axis (that is, over the entire stroke of the working portion), which is preferable.

According to the present invention, the load (reaction force) on various bearings used in the reciprocating linear motion mechanism can be stably suppressed, and the heat generation and vibration of the bearing can be suppressed. The various bearings are a bearing that rotatably supports the first rotating body with respect to the mechanism frame, a bearing that rotatably supports the second rotating body with respect to the first rotating body, and the like. Then, the amount of coolant used for cooling and lubricating the bearing can be reduced, and the life of the bearing can be extended. Further, since the load on the bearing can be reduced, the fluctuation of the power consumption of the reciprocating linear motion mechanism can be suppressed to be small, and the accuracy of the reciprocating linear motion output to the outside of the mechanism can be stably improved.
Further, in the front view of the reciprocating linear motion mechanism viewed from the first central axis direction, the first symmetrical axis passing through the first central axis and the second central axis in the first radial direction is described. 1 The weight portion is formed in a line-symmetrical shape.
Further, in the front view of the reciprocating linear motion mechanism viewed from the second central axis direction, the second radial direction orthogonal to the second central axis passes through the center of the second central axis and the action portion. With respect to the two axes of symmetry, the second weight portion is formed in a line-symmetrical shape.
In this case, since the first weight portion and the second weight portion have a line-symmetrical shape in the front view of the reciprocating linear motion mechanism, the balance of the first weight portion itself and the balance of the second weight portion itself are good. Can be maintained at. Further, the balance of the entire first rotating body and the balance of the entire second rotating body can be improved. As a result, the variation in the weight balance in the direction perpendicular to the stroke direction can be suppressed to be small, and the variation in the weight balance in the stroke direction can also be suppressed to be small.
Further, in the front view of the reciprocating linear motion mechanism viewed from the first central axis direction, both ends of the first weight portion in the direction perpendicular to the first symmetry axis are inclined with respect to the first symmetry axis. First balance processing portions are formed.
In this case, in the front view of the reciprocating linear motion mechanism, first balance processing portions inclined with respect to the first symmetry axis are formed at both ends in the direction perpendicular to the first symmetry axis of the first weight portion. Therefore, while scraping both ends of the first weight portion so as to have a line-symmetrical shape with respect to the first axis of symmetry (that is, by driving both ends of the first weight portion by cutting to form the first balance processing portion). , The position of the center of gravity of the first weight portion along the direction of the first axis of symmetry can be changed.
That is, by setting various shapes, inclination angles, etc. of the first balance processing portion, the center of gravity of the first weight portion is not changed in the direction perpendicular to the first symmetry axis, but in the first symmetry axis direction. Since it can be changed, the position of the center of gravity of the first weight portion can be easily adjusted.
Further, in the front view of the reciprocating linear motion mechanism viewed from the second central axis direction, both ends of the second weight portion in the direction perpendicular to the second symmetry axis are inclined with respect to the second symmetry axis. The second balance processing portion extending is formed respectively.
In this case, in the front view of the reciprocating linear motion mechanism, second balance processing portions inclined with respect to the second symmetry axis are formed at both ends in the direction perpendicular to the second symmetry axis of the second weight portion. Therefore, while scraping both ends of the second weight portion so as to have a line-symmetrical shape with respect to the second axis of symmetry (that is, by driving both ends of the second weight portion by cutting to form the second balance processed portion). , The position of the center of gravity of the second weight portion along the direction of the second axis of symmetry can be changed.
That is, by setting the shape and inclination angle of the second balance processing portion in various ways, the center of gravity of the second weight portion is not changed in the direction perpendicular to the second symmetry axis, but in the second symmetry axis direction. Since it can be changed, the position of the center of gravity of the second weight portion can be easily adjusted.

Further, in the reciprocating linear motion mechanism, the first weight portion is located at least on the side opposite to the second central axis of the first rotating body with respect to the first central axis along the first radial direction. The second weight portion is provided on the portion to be formed, and the second weight portion is at least on the opposite side of the second rotating body from the second central axis along the second radial direction orthogonal to the second central axis. It is preferable that it is provided in a portion located in.

In this case, the first weight portion is provided at a portion of the first rotating body located on the side opposite to the second central axis with respect to the first central axis along the first radial direction. That is, in the first rotating body, the second rotating body and the first weight portion are arranged so as to be opposite to each other (180 ° rotationally symmetric position) with respect to the first central axis. Therefore, when the first rotating body and the second rotating body are rotated around the first central axis with respect to the mechanism frame, the first rotating body and the second rotating body are centered on the first central axis. By balancing with the first weight portion, the load on the bearing that pivotally supports the first rotating body is reduced.

Further, a second weight portion is provided in a portion of the second rotating body located on the side opposite to the acting portion from the second central axis along the second radial direction orthogonal to the second central axis. That is, in the second rotating body, the acting portion and the second weight portion are arranged so as to be opposite to each other (180 ° rotationally symmetric position) with respect to the second central axis. Therefore, when the second rotating body is rotated around the second central axis, the acting portion and the second weight portion are balanced around the second central axis in the second rotating body, so that the second rotation occurs. The load on the bearings that support the body is reduced.

Further, focusing on the positional relationship between the first weight portion and the second weight portion, the first weight portion and the first weight portion have a virtual straight line (stroke locus of the action portion) extending in a predetermined direction in the first radial direction. The two weight portions move so as to maintain their positions on opposite sides of each other (specifically, as shown in FIGS. 7 to 10, for example, the first weight portion 21 and the second weight portion 21 and the second weight portion). The portion 22 moves up and down with respect to the virtual straight line V extending on the horizontal axis X).
That is, the first weight portion and the second weight portion move while being balanced with each other with the virtual straight line in between. Therefore, the load on various bearings used in the reciprocating linear motion mechanism can be effectively suppressed, and the above-mentioned action and effect become more remarkable.

Further, in the reciprocating linear motion mechanism, the first rotation over the entire stroke in which the acting portion reciprocates linearly along the predetermined direction in the front view of the reciprocating linear motion mechanism viewed from the first central axis direction. It is preferable that the body and the center of gravity derived from the second rotating body are arranged close to the virtual straight line extending in the predetermined direction.

In this case, it is possible to suppress variations in the weight balance in the direction perpendicular to the predetermined direction (virtual straight line) in the first radial direction over the entire stroke of the working portion. Along with this, the variation in the weight balance in the predetermined direction is also reduced.

Further, in the reciprocating linear motion mechanism, the distance between the virtual straight line and the center of gravity is preferably 0.1 mm or less in the front view of the reciprocating linear motion mechanism viewed from the first central axis direction.

In this case, over the entire stroke of the working portion, between the virtual straight line extending in a predetermined direction in the first radial direction and the center of gravity of the first rotating body and the second rotating body in the front view of the reciprocating linear motion mechanism. Since the distance (distance in the direction perpendicular to the stroke direction) is suppressed to 0.1 mm or less, the variation in the weight balance in the direction perpendicular to the stroke direction can be suppressed to be small.

Further, in the reciprocating linear motion mechanism, the distance between the virtual straight line and the center of gravity is 0.1% of the total stroke of the acting portion in the front view of the reciprocating linear motion mechanism viewed from the first central axis direction. The following is preferable.

In this case, over the entire stroke of the working portion, between the virtual straight line extending in a predetermined direction in the first radial direction and the center of gravity of the first rotating body and the second rotating body in the front view of the reciprocating linear motion mechanism. Since the distance (distance in the direction perpendicular to the stroke direction) is suppressed to 0.1% or less of the total length of the stroke, the variation in the weight balance in the direction perpendicular to the stroke direction can be suppressed to be small.

According to the reciprocating linear motion mechanism of the present invention and the can forming apparatus using the same, the load on the bearing used in the reciprocating linear motion mechanism can be reduced, the fluctuation of the power consumption can be suppressed to a small value, and the output can be output to the outside of the mechanism. The accuracy of reciprocating linear motion can be improved.

It is the schematic which shows the can molding apparatus which concerns on one Embodiment of this invention. It is a perspective view which shows the reciprocating linear motion mechanism of a can molding apparatus. It is a vertical cross-sectional view of a reciprocating linear motion mechanism. It is a vertical cross-sectional view of a reciprocating linear motion mechanism, and illustration of members other than internal gears in the mechanism frame is omitted. It is a partial transmission perspective view explaining the internal structure of a reciprocating linear motion mechanism. It is a perspective view which shows the modification of the reciprocating linear motion mechanism. It is a figure explaining the operation of the reciprocating linear motion mechanism. It is a figure explaining the operation of the reciprocating linear motion mechanism. It is a figure explaining the operation of the reciprocating linear motion mechanism. It is a figure explaining the operation of the reciprocating linear motion mechanism.

Hereinafter, the reciprocating linear motion mechanism 1 and the can molding apparatus 10 according to the embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, the reciprocating linear motion mechanism 1 of the present embodiment is provided in a can forming apparatus (DI can manufacturing apparatus) 10 in which a cup-shaped body W, which is a work, is subjected to DI processing to form a DI can.

First, the DI can will be described.
DI cans are used for cans (two-piece cans and bottle cans) that are filled and sealed with contents such as beverages. In the case of a two-piece can, the can body includes a bottomed tubular DI can and a disk-shaped can lid wrapped around the open end of the DI can. In the case of a bottle can, the can body includes a bottle can body obtained by necking and screwing a DI can, and a cap screwed to the open end thereof. The "DI" of the DI can is an abbreviation for Drawing & Ironing.

The DI can is formed into a bottomed tubular shape by subjecting a disk-shaped blank punched from a plate material such as an aluminum alloy material to a cupping step (squeezing step) and a DI step (squeezing ironing step). Specifically, in the case of a two-piece can, for example, the DI can is manufactured through a plate material punching step, a cutting step, a DI step, a trimming step, a printing step, a painting step, a necking step, and a franging step in this order.

In the process of manufacturing a DI can, the blank is drawn (cupping) by a cupping press and formed into a cup-shaped body W. That is, the cup-shaped body W is a molding intermediate produced in the process of shifting from the blank to the DI can in the cupping step. The cup-shaped body W has a bottomed tubular shape in which the height of the peripheral wall (length along the can axis direction) is smaller than that of the DI can and the diameter of the bottom wall is large.

Next, the can molding apparatus 10 will be described.
The can forming apparatus 10 is used in the DI step, and the cup-shaped body W is subjected to DI processing (drawing (re-squeezing) ironing processing) to form a DI can.

In FIG. 1, in the can forming apparatus 10, a reciprocating linear motion mechanism 1 described later, a punch sleeve 35 connected to an action portion 2 of the reciprocating linear motion mechanism 1 via a ram shaft or the like, and a punch sleeve 35 are inserted. It is inserted into the die 30 in which the through hole 30a is formed and the cup-shaped body W arranged in the end surface 30b where the through hole 30a of the die 30 opens, and the bottom wall of the cup-shaped body W is pressed against the end surface 30b. It includes a cup holder sleeve 36 for fixing.

The punch sleeve 35 has a cylindrical shape or a columnar shape, and is reciprocated linearly in the direction of the central axis of the through hole 30a of the die 30 by the reciprocating linear motion mechanism 1, and is fitted in the through hole 30a. Specifically, the working portion 2 of the reciprocating linear motion mechanism 1 reciprocates linearly along the central axis direction of the punch sleeve 35 and the die 30 as shown by the bidirectional arrow of reference numeral S in FIG. 1. The punch sleeve 35 makes a reciprocating linear motion with respect to the die 30. The total stroke length of the action unit 2 in the stroke direction S (direction along the virtual straight line V described later) is, for example, 533.4 to 720.09 mm. In FIG. 1, the stroke of the punch sleeve 35 with respect to the die 30 is shown to be larger than the stroke (movement amount) of the reciprocating linear motion of the acting unit 2 in the stroke direction S, but these are actually shown. The strokes are the same as each other.

In the example of this embodiment, a plurality of dies 30 are provided along the central axis direction (stroke direction S) of the punch sleeve 35. Specifically, the plurality of dies 30 include one redrawing die 31 having a through hole 31a having a circular cross section, and through holes 32a, 33a, 34a having a circular cross section arranged coaxially with the redrawing die 31. A plurality of (three in the illustrated example) ironing dies (ironing dies) 32, 33, and 34 are included. Further, a pilot ring 37 is arranged on the side opposite to the reciprocating linear motion mechanism 1 along the central axis direction of each of the ironing dies 32 to 34. By providing the pilot ring 37, it is possible to prevent the punch sleeve 35 from coming into contact with the dies 32 to 34 due to the impact when the can comes off the ironing dies 32 to 34 during molding.
Further, at the time of molding, a coolant liquid is supplied to the redrawing dies 31 and the ironing dies 32 to 34 for lubrication and cooling.

The cup holder sleeve 36 has a cylindrical shape, is fitted to the outside of the punch sleeve 35, and can be slidably moved in the stroke direction S with respect to the punch sleeve 35. The cup holder sleeve 36 has a cup-shaped body W on an end surface 31b facing the reciprocating linear motion mechanism 1 side of the redrawing die 31 arranged on the most reciprocating linear motion mechanism 1 side along the stroke direction S among the plurality of dies 30. It is possible to press the bottom wall of.

The central axes of the plurality of dies 30 (redrawing dies 31, ironing dies 32 to 34), punch sleeve 35, and cup holder sleeve 36 described above are coaxial with each other and are arranged so as to extend in the horizontal direction.
As the die 30, the punch sleeve 35, and the cup holder sleeve 36, for example, those described in JP-A-2007-216302 can be used.

DI processing into the cup-shaped body W by the can forming apparatus 10 is performed as follows.
First, the cup-shaped body W, which is a work, is arranged between the punch sleeve 35 and the re-squeezing die 31 with the cup shaft (can shaft) extended in the horizontal direction and the opening thereof directed toward the punch sleeve 35. To. The bottom wall of the cup-shaped body W is arranged close to or abutted against the end surface 31b of the redraw die 31.

The cup holder sleeve 36 and the punch sleeve 35 move forward with respect to the cup-shaped body W (specifically, they move toward the side opposite to the reciprocating linear motion mechanism 1 along the stroke direction S). Then, while the cup holder sleeve 36 presses the bottom wall of the cup-shaped body W against the end surface 31b of the re-drawing die 31 to perform the cup pressing operation, the punch sleeve 35 pushes the cup-shaped body W through the through hole 31a of the re-drawing die 31. Push it in and re-draw it.

By the redrawing process, the cup-shaped body W is formed into a small diameter and a large length (height) along the cup axial direction. Subsequently, the cup-shaped body W is pushed in by the punch sleeve 35, and the through holes 32a to 34a of the plurality of ironing dies 32 to 34 are sequentially passed and ironed gradually. That is, the peripheral wall of the cup-shaped body W is squeezed to extend the peripheral wall, the height of the peripheral wall is increased and the wall thickness is reduced to form a bottomed tubular DI can. This DI can is cold-work-hardened by squeezing the peripheral wall to increase its strength.

The DI can, which has been ironed, is formed into a dome shape by the punch sleeve 35 pushing further forward and pressing the bottom portion (the portion that becomes the can bottom) against a bottom molding die (not shown).

In addition to the above-described configuration, the can molding apparatus 10 also includes the following configuration (not shown).
The can forming apparatus 10 includes a ram shaft to which the punch sleeve 35 is connected and extends in the horizontal direction, a plurality of (for example, two) fluid bearings that movably support the ram shaft in the stroke direction S, and a cup holder sleeve 36. A cup-shaped body W can be formed by discharging gas from the tip of a gas discharge hole formed in the punch sleeve 35 and a cup holder drive mechanism that reciprocates and linearly moves in the stroke direction S in synchronization with the punch sleeve 35. It is provided with a gas discharge mechanism for releasing the DI can from the tip of the punch sleeve 35, and a can carry-out mechanism for carrying out the DI can released from the punch sleeve 35 to the outside of the apparatus.
The above-mentioned members, mechanisms, and the like are supported by the apparatus frame of the can forming apparatus 10. As these members, mechanisms, and the like, for example, those described in Patent Documents 1 (Japanese Patent Laid-Open No. 6-71351) and 2 (Japanese Patent Laid-Open No. 6-71352) described above can be used.

Next, the reciprocating linear motion mechanism 1 will be described.
In FIGS. 2 to 5, the reciprocating linear motion mechanism 1 is formed on a mechanism frame 4 having an internal gear 3 on an inner peripheral surface and a mechanism frame 4 rotatably around a first central axis C1 coaxial with the internal gear 3. An external gear that is rotatably supported by the first rotating body 11 and meshes with the internal gear 3 around the second central axis C2 that is parallel to the first central axis C1. A reciprocating linear motion along a predetermined direction (stroke direction S) among the second rotating body 12 having 5 on the outer peripheral surface and the first radial direction provided on the second rotating body 12 and orthogonal to the first central axis C1. It is provided with an acting portion 2, a first weight portion 21 provided on the first rotating body 11, and a second weight portion 22 provided on the second rotating body 12.

Further, the reciprocating linear motion mechanism 1 is provided with various bearings. In FIG. 3, the various bearings include bearings 8 and 9 provided on the mechanical frame 4 and rotatably supporting the first rotating body 11 around the first central axis C1 with respect to the mechanical frame 4. Bearings 13 and 14 provided on the first rotating body 11 and rotatably supporting the second rotating body 12 around the second central axis C2 with respect to the first rotating body 11 and the outer periphery of the working portion 2 are provided. A bearing 15 that rotatably supports the acting portion 2 around the central axis A with respect to the ram shaft (not shown) is included.

As shown in FIG. 3, the mechanism frame 4 has a multi-stage cylindrical shape. The mechanism frame 4 includes a large-diameter tubular portion 6 and a small-diameter tubular portion 7 that are coaxial with the first central axis C1 and are integrally connected in the direction of the first central axis C1.

In the present embodiment, the direction along the first central axis C1 (the direction in which the first central axis C1 extends) is referred to as the first central axis C1 direction. Since the first central axis C1 and the second central axis C2 are parallel to each other, the direction of the first central axis C1 can be rephrased as the direction of the second central axis C2.
Further, the direction from the small diameter cylinder portion 7 to the large diameter cylinder portion 6 along the first central axis C1 direction is referred to as the front side (one side), and the direction from the large diameter cylinder portion 6 to the small diameter cylinder portion 7 is the back side. (The other side).

The direction orthogonal to the first central axis C1 is referred to as the first radial direction. Of the first radial directions, the direction approaching the first central axis C1 is referred to as the inside in the first radial direction, and the direction away from the first central axis C1 is referred to as the outside in the first radial direction.
Further, the direction of orbiting around the first central axis C1 is referred to as the first circumferential direction. Of the first circumferential directions, the direction in which the first rotating body 11 is rotated with respect to the mechanism frame 4 when the mechanism 1 is operating is referred to as the rotation direction T1 of the first rotating body 11.

The direction orthogonal to the second central axis C2 is referred to as the second radial direction. Of the second radial directions, the direction approaching the second central axis C2 is referred to as the inside in the second radial direction, and the direction away from the second central axis C2 is referred to as the outside in the second radial direction.
Further, the direction of orbiting around the second central axis C2 is referred to as the second circumferential direction. Of the second circumferential directions, the direction in which the second rotating body 12 is rotated with respect to the first rotating body 11 when the mechanism 1 is operated is referred to as the rotation direction T2 of the second rotating body 12.

The internal gear 3 is provided on the inner circumference of the large-diameter tubular portion 6 of the mechanism frame 4. In the illustrated example, the internal gear 3 is arranged at the center of the large-diameter tubular portion 6 in the direction of the first central axis C1. Further, in the inner circumference of the large-diameter tubular portion 6, the bearing 8 is arranged on the front side in the direction of the first central axis C1 with respect to the internal gear 3. Further, a bearing 9 is arranged on the inner circumference of the small diameter tubular portion 7. That is, the internal gear 3 is arranged between the pair of bearings 8 and 9 along the direction of the first central axis C1 on the inner circumference of the mechanism frame 4.

The first rotating body 11 is made of, for example, an aluminum material and has a multi-stage columnar shape. The first rotating body 11 is coaxial with the first central axis C1 and includes a large-diameter portion 16 and a small-diameter portion 17 integrally connected in the direction of the first central axis C1. The large diameter portion 16 is arranged in the large diameter cylinder portion 6 of the mechanism frame 4, and the small diameter portion 17 is arranged in the small diameter cylinder portion 7 of the mechanism frame 4. The large-diameter portion 16 is rotatably supported by a bearing 8 provided in the large-diameter tubular portion 6. The small diameter portion 17 is rotatably supported by a bearing 9 provided in the small diameter tubular portion 7.

The rear end of the small diameter portion 17 in the direction of the first central axis C1 projects from the small diameter cylinder portion 7 toward the rear side, and the end portion has a rotation direction transmitted from a drive motor (not shown). The rotational driving force to T1 is input.
On the second central axis C2 separated from the first central axis C1 in the large diameter portion 16, a cylindrical hole-shaped chamber 18 extending along the second central axis C2 is formed, and inside the chamber 18 The second rotating body 12 is housed. A pair of bearings 13 and 14 are arranged at both ends of the inner circumference of the chamber 18 in the direction of the second central axis C2, and the second rotating body 12 is rotatably supported by these bearings 13 and 14. There is. The external gear 5 of the second rotating body 12 is arranged between the pair of bearings 13 and 14 along the direction of the second central axis C2 in the chamber 18.

In the example of the present embodiment, the second rotating body 12 is made of, for example, a steel material and has a cylindrical shape (multi-stage cylindrical shape). The second rotating body 12 is made of a material having a higher specific gravity (density) than the first rotating body 11. The external gear 5 is arranged on the outer circumference of the second rotating body 12 corresponding to the internal gear 3 of the mechanism frame 4 along the second central axis C2 direction.

As shown in FIGS. 3 to 5, the external gear 5 meshes with the internal gear 3 and rotates along the inner circumference of the internal gear 3 in the rotation direction T1 around the first central axis C1 ( While moving (revolving), it rotates (rotates) in the rotation direction T2 around the second central axis C2. The pitch circle diameter of the external gear 5 is 1/2 of the pitch circle diameter of the internal gear 3.

In the example of this embodiment, the acting portion 2 has a cylindrical shape. When the reciprocating linear motion mechanism 1 is viewed from the front in the direction of the first central axis C1, the central axis A of the working portion 2 is arranged on the pitch circle diameter of the external gear 5. Further, the central axis A of the working portion 2 is separated in parallel with the second central axis C2, and the distance between the central axis A and the second central axis C2 (distance along the second radial direction) is , The distance between the first central axis C1 and the second central axis C2 (distance along the first radial direction or the second radial direction) is equalized. Further, the action unit 2 is arranged so as to project from the mechanism frame 4 toward the front side in the direction of the first central axis C1.

In FIGS. 2 to 4, the first weight portion 21 and the second weight portion 22 are so-called counterweights used for adjusting the weight balance of the first rotating body 11 and the second rotating body 12.
The first weight portion 21 is a primary weight provided on the first rotating body 11, and the second weight portion 22 is a secondary weight provided on the second rotating body 12.

In the example of the present embodiment, the first weight portion 21 is provided at the front end portion of the first rotating body 11 in the direction of the first central axis C1. Further, the second weight portion 22 is provided at the front end portion of the second rotating body 12 in the direction of the second central axis C2. Further, the first weight portion 21 and the second weight portion 22 are arranged at the same positions along the first central axis C1 direction. However, since the second weight portion 22 orbits the inside of the first weight portion 21 in the first radial direction when the mechanism 1 is in operation, the weight portions 21 and 22 do not interfere with each other.

The first weight portion 21 is provided at least in a portion of the first rotating body 11 located on the side opposite to the second central axis C2 with respect to the first central axis C1 along the first radial direction. Further, the second weight portion 22 is provided at least in a portion of the second rotating body 12 located on the side opposite to the acting portion 2 with respect to the second central axis C2 along the second radial direction.

In the example of the present embodiment, the first weight portion 21 is formed in a semicircular arc shape and is detachably attached to the first rotating body 11. Further, the second weight portion 22 is formed in a semicircular plate shape, and is detachably attached to the second rotating body 12.
As shown in FIGS. 7 to 10, in the front view of the reciprocating linear motion mechanism 1 when the reciprocating linear motion mechanism 1 is viewed from the directions of the first central axis C1 and the second central axis C2, among the first radial directions. The first weight portion 21 is formed in a line-symmetrical shape with respect to the first symmetric axis B1 passing through the first central axis C1 and the second central axis C2. Further, in this front view, the second weight portion 22 is a line with respect to the second symmetrical axis B2 passing through the second central axis C2 and the central axis A of the acting portion 2 (the center of the acting portion 2) in the second radial direction. It is formed in a symmetrical shape.
7 (a) to (c), 8 (a) to (c), 9 (a) to (c) and 10 (a) to (c) show the reciprocating linear motion mechanism in this order. It represents the operation at the time of operation of 1. Specifically, the first rotating body 11 (and its first weight portion 21) and the second rotating body 12 (and its second weight portion 22) rotate along the rotation direction T1 around the first central axis C1. The first central axis shows how the second rotating body 12 (and its second weight portion 22) rotates (rotates) along the rotation direction T2 around the second central axis C2 while (revolving). It is displayed over the entire circumference of 360 ° every 30 ° around C1.

In the example of the present embodiment in FIGS. 2 to 4, in the front view of the reciprocating linear motion mechanism 1, both ends of the first weight portion 21 in the direction perpendicular to the first symmetry axis B1 with respect to the first symmetry axis B1. First balance processing portions 21a extending in an inclined manner are formed. Further, in this front view, second balance processing portions 22a extending in an inclined manner with respect to the second symmetry axis B2 are formed at both ends of the second weight portion 22 in the direction perpendicular to the second symmetry axis B2. ..

Specifically, the pair of first balance processing portions 21a formed on the first weight portion 21 gradually gradually move from the first central axis C1 to the second central axis C2 side along the first symmetry axis B1 direction. It extends inclining toward the inside (the first central axis C1 side) in the direction perpendicular to the first symmetry axis B1. That is, the pair of first balance processing portions 21a are inclined so as to be gradually brought closer to each other from the first central axis C1 toward the second central axis C2 along the first symmetry axis B1 direction. ..

Further, the pair of second balance processing portions 22a formed on the second weight portion 22 gradually move from the second central axis C2 toward the central axis A side of the action portion 2 along the second symmetry axis B2 direction. It extends incline toward the inside (the second central axis C2 side) in the direction perpendicular to the second symmetry axis B2. That is, the pair of second balance processing portions 22a are inclined so as to be gradually brought closer to each other from the second central axis C2 toward the central axis A side of the action portion 2 along the second symmetry axis B2 direction. ing.

The shapes and sizes of the first weight portion 21 and the second weight portion 22 are not limited to the above-described example of the present embodiment. Here, FIGS. 6 to 10 show a modified example of the present embodiment, and in this modified example, the first weight portion 21 and the second weight portion 22 are larger than those shown in FIGS. 2 to 4. Each is formed large. Further, in this modification, the second balance processing portion 22a is not formed on the second weight portion 22. As described above, the shapes and sizes of the first weight portion 21 and the second weight portion 22 may be set in various ways.

However, in the present embodiment (including a modified example), the acting portion 2 is along the predetermined direction (stroke direction S) in the first radial direction in the front view of the reciprocating linear motion mechanism 1 viewed from the direction of the first central axis C1. The center of gravity derived from the first rotating body 11 and the second rotating body 12 is arranged close to the virtual straight line V extending in a predetermined direction over the entire length of the stroke that reciprocates linearly.
Specifically, in FIGS. 1 and 7 to 10, a predetermined direction (stroke direction S) in which the action unit 2 makes a reciprocating linear motion is along the horizontal axis X. Then, the center of gravity derived from the first rotating body 11 and the second rotating body 12 passes through the central axis A of the acting portion 2 and extends on the horizontal axis X with respect to the virtual straight line V over the entire stroke in the vertical axis Y direction. It is placed close to.

More specifically, the distance between the virtual straight line V and the center of gravity (distance along the vertical axis Y) is 0.1 mm or less in the front view of the reciprocating linear motion mechanism 1 viewed from the direction of the first central axis C1. Further, in this front view, the distance between the virtual straight line V and the center of gravity is 0.1% or less of the total stroke length (stroke length along the horizontal axis X) of the working portion 2.
In setting the position of the center of gravity, for example, it can be obtained by analysis using three-dimensional CAD software, spreadsheet software, or the like. At this time, at each predetermined angle around the first central axis C1 when the reciprocating linear motion mechanism 1 operates (for example, every 1 ° over the entire circumference of 360 °), while checking the position of the center of gravity, the first weight portion 21 and By adjusting each shape of the second weight portion 22 (shapes of the first balance processing portion 21a and the second balance processing portion 22a described above, etc.), the entire circumference around the first central axis C1 (that is, the action portion 2) The balance function can be improved (over the entire stroke of the stroke), which is preferable.

In the reciprocating linear motion mechanism 1 and the can forming device 10 of the present embodiment described above, when the rotational driving force around the first central axis C1 is transmitted from the outside of the mechanism 1 to the first rotating body 11, FIGS. As shown in, the first rotating body 11 is rotated around the first central axis C1 with respect to the mechanism frame 4. When the first rotating body 11 is rotated around the first central axis C1, the second rotating body 12 supported by the first rotating body 11 is also rotated around the first central axis C1.

At this time, since the external gear 5 of the second rotating body 12 and the internal gear 3 of the mechanism frame 4 mesh with each other, the second rotating body 12 is rotated (revolved) around the first central axis C1. While being rotated, it is also rotated (rotated) around the second central axis C2. It should be noted that the second rotating body 12 revolves around the first central axis C1 in the front view of the reciprocating linear motion mechanism 1 as viewed from the first central axis C1 direction (which may be paraphrased as the second central axis C2 direction; the same applies hereinafter). The rotation direction T1 to be rotated and the rotation direction T2 to be rotated around the second central axis C2 are opposite to each other.

As a result, the acting portion 2 provided on the second rotating body 12 is a reciprocating straight line along a predetermined direction (horizontal axis X direction in the example of the present embodiment) in the first radial direction orthogonal to the first central axis C1. Exercise. That is, the reciprocating linear motion mechanism 1 of the present embodiment converts the rotational driving force (rotational motion) input to the first rotating body 11 from the outside of the mechanism 1 into a reciprocating linear driving force (reciprocating linear motion), and acts as an action unit. Output to the outside of the mechanism 1 via 2.
Therefore, by connecting the punch sleeve 35 to the acting portion 2 via the ram shaft or the like, the punch sleeve 35 can be reciprocated and linearly moved in a predetermined direction (stroke direction S extending on the horizontal axis X). The cup-shaped body W can be DI-processed using a punch sleeve 35, a die 30, a cup holder sleeve 36, or the like to form a DI can.

In the present embodiment, the first rotating body 11 is provided with the first weight portion 21, and the second rotating body 12 is provided with the second weight portion 22.
Therefore, with respect to the mechanism frame 4, the first rotating body 11 and the second rotating body 12 are rotated around the first central axis C1, and the second rotating body 12 is rotated around the second central axis C2. By the balancing action of the first weight portion 21 and the second weight portion 22, the weight balance of the first and second rotating bodies 11 and 12 can be maintained in a good state.

Specifically, for example, in the front view of the reciprocating linear motion mechanism 1, the center of gravity of the first rotating body 11 and the second rotating body 12 as a whole is set over one rotation (entire circumference) around the first central axis C1. It can be arranged close to the virtual straight line V (that is, the stroke locus of the action unit 2) extending in the predetermined direction in the first radial direction, or can be arranged close to the first central axis C1. Further, the center of gravity of the second rotating body 12 can be arranged close to the second central axis C2 over one rotation (entire circumference) around the second central axis C2.

Therefore, according to the present embodiment, the load (reaction force) on various bearings used in the reciprocating linear motion mechanism 1 can be stably suppressed, and the heat generation and vibration of the bearing can be suppressed. The various bearings include bearings 8 and 9 that rotatably support the first rotating body 11 with respect to the mechanism frame 4, and rotatably supporting the second rotating body 12 with respect to the first rotating body 11. Bearings 13, 14 and the like. Then, the amount of coolant used for cooling and lubricating the bearing can be reduced, and the life of the bearing can be extended. Further, since the load on the bearing can be reduced, the fluctuation of the power consumption of the reciprocating linear motion mechanism 1 can be suppressed to be small, and the accuracy of the reciprocating linear motion output to the outside of the mechanism 1 can be stably improved. ..

Further, in the present embodiment, the first weight portion 21 is provided at least in a portion of the first rotating body 11 located on the side opposite to the second central axis C2 with respect to the first central axis C1 along the first radial direction. Has been done. Further, the second weight portion 22 is provided at least in a portion of the second rotating body 12 located on the side opposite to the acting portion 2 (central axis A) of the second central axis C2 along the second radial direction. Has been done. Therefore, it has the following effects.

That is, in this case, the first weight portion 21 is provided in the portion of the first rotating body 11 located on the side opposite to the second central axis C2 with respect to the first central axis C1 along the first radial direction. .. That is, in the first rotating body 11, the second rotating body 12 and the first weight portion 21 are arranged so as to be opposite to each other (180 ° rotationally symmetric position) with respect to the first central axis C1. Therefore, when the first rotating body 11 and the second rotating body 12 are rotated around the first central axis C1 with respect to the mechanism frame 4, the first rotating body 11 is centered on the first central axis C1. By balancing the second rotating body 12 and the first weight portion 21, the load on the bearings 8 and 9 that pivotally support the first rotating body 11 is reduced.

Further, a second weight portion 22 is provided in a portion of the second rotating body 12 located on the side opposite to the acting portion 2 with respect to the second central axis C2 along the second radial direction. That is, in the second rotating body 12, the acting portion 2 and the second weight portion 22 are arranged so as to be opposite to each other (180 ° rotationally symmetric position) with respect to the second central axis C2. Therefore, when the second rotating body 12 is rotated around the second central axis C2, the acting portion 2 and the second weight portion 22 are balanced with respect to the second central axis C2 in the second rotating body 12. As a result, the load on the bearings 13 and 14 that pivotally support the second rotating body 12 is reduced.

Further, paying attention to the positional relationship between the first weight portion 21 and the second weight portion 22, the first one is sandwiched between a virtual straight line V (stroke locus of the acting portion 2) extending in a predetermined direction in the first radial direction. The weight portion 21 and the second weight portion 22 move so as to maintain their positions on opposite sides of each other. Specifically, in the present embodiment, as shown in FIGS. 7 to 10, the first weight portion 21 and the second weight portion 22 move up and down (vertical axis) about a virtual straight line V extending on the horizontal axis X. Move in a balanced manner (in the Y direction).

More specifically, when the center of gravity of the first weight portion 21 is located below the virtual straight line V (horizontal axis X), the center of gravity of the second weight portion 22 is located above the virtual straight line V (). 7 (a) to (c) and FIGS. 10 (b) and 10 (c)). Further, when the center of gravity of the first weight portion 21 is located above the virtual straight line V, the center of gravity of the second weight portion 22 is located below the virtual straight line V (FIGS. 8B, 8). c) and FIGS. 9 (a) to 9 (c)). Further, when the center of gravity of the first weight portion 21 is located on the virtual straight line V, the center of gravity of the second weight portion 22 is also located on the virtual straight line V (FIGS. 8A and 10A). ).

That is, the first weight portion 21 and the second weight portion 22 move while being balanced with each other with the virtual straight line V in between. Therefore, the load on various bearings used in the reciprocating linear motion mechanism 1 can be effectively suppressed, and the above-mentioned action and effect become more remarkable.

Further, in the present embodiment, in the front view of the reciprocating linear motion mechanism 1 viewed from the direction of the first central axis C1, the first rotation over the entire stroke in which the acting unit 2 reciprocates linearly along a predetermined direction (stroke direction S). Since the center of gravity derived from the body 11 and the second rotating body 12 is arranged close to the virtual straight line V extending in the predetermined direction, the following effects are exhibited.
That is, in this case, it is possible to suppress variations in the weight balance in the direction perpendicular to the predetermined direction (virtual straight line V) (in the example of the present embodiment, the vertical axis Y direction) over the entire stroke of the acting unit 2. Along with this, the variation in the weight balance in the predetermined direction (in the example of the present embodiment, the horizontal axis X direction) also becomes small.

Further, in the present embodiment, the virtual straight line V extending in a predetermined direction (stroke direction S) in the first radial direction and the first rotating body 11 in the front view of the reciprocating linear motion mechanism 1 over the entire stroke of the acting unit 2. The distance between the center of gravity derived from the second rotating body 12 and the center of gravity (distance in the direction perpendicular to the stroke direction S. In the example of the present embodiment, the distance in the vertical axis Y direction) is suppressed to 0.1 mm or less. Therefore, the variation in the weight balance in the direction perpendicular to the stroke direction S can be suppressed to a small extent.

Further, in the present embodiment, a virtual straight line V extending in a predetermined direction (stroke direction S) in the first radial direction and a first rotating body 11 in the front view of the reciprocating linear motion mechanism 1 over the entire stroke of the acting unit 2 The distance between the center of gravity derived from the second rotating body 12 and the center of gravity (distance in the direction perpendicular to the stroke direction S. In the example of the present embodiment, the distance in the vertical axis Y direction) is 0.1% of the total stroke length. Since it is suppressed to the following, the variation in the weight balance in the direction perpendicular to the stroke direction S can be suppressed to be small.

Further, in the present embodiment, in the front view of the reciprocating linear motion mechanism 1 viewed from the first central axis C1 direction, the first symmetric axis B1 passing through the first central axis C1 and the second central axis C2 in the first radial direction. The first weight portion 21 is formed in a line-symmetrical shape. Further, in the front view of the reciprocating linear motion mechanism 1 viewed from the direction of the second central axis C2, the second symmetrical axis passing through the center (central axis A) of the second central axis C2 and the acting portion 2 in the second radial direction. With respect to B2, the second weight portion 22 is formed in a line-symmetrical shape. Therefore, it has the following effects.

That is, in this case, since the first weight portion 21 and the second weight portion 22 have a line-symmetrical shape in the front view of the reciprocating linear motion mechanism 1, the balance of the first weight portion 21 itself and the second weight portion 22 itself. The balance of each can be maintained well. Further, the balance of the entire first rotating body 11 and the balance of the entire second rotating body 12 can be improved. As a result, the variation in the weight balance in the direction perpendicular to the stroke direction S (the vertical axis Y direction in the example of the present embodiment) can be suppressed to be small, and the stroke direction S (the horizontal axis X direction in the example of the present embodiment). It is also possible to keep the variation in weight balance to a small amount.

Further, in the present embodiment, in the front view of the reciprocating linear motion mechanism 1, the first balance processing is performed so that both ends of the first weight portion 21 in the direction perpendicular to the first symmetry axis B1 are inclined with respect to the first symmetry axis B1. Since each of the portions 21a is formed, both ends of the first weight portion 21 are shaved (that is, both ends of the first weight portion 21 are driven by cutting) so as to have a line-symmetrical shape with respect to the first symmetry axis B1. By forming the first balance processing portion 21a), the position of the center of gravity of the first weight portion 21 along the direction of the first symmetry axis B1 can be changed.
That is, by setting various shapes, inclination angles, etc. of the first balance processing portion 21a, the center of gravity of the first weight portion 21 is not changed in the direction perpendicular to the first symmetry axis B1, and the first symmetry axis is not changed. Since it can be changed in the B1 direction, it is easy to adjust the position of the center of gravity of the first weight portion 21.

Further, in the present embodiment, in the front view of the reciprocating linear motion mechanism 1, both ends of the second weight portion 22 in the direction perpendicular to the second symmetry axis B2 are subjected to the second balance processing that is inclined with respect to the second symmetry axis B2. Since each of the portions 22a is formed, both ends of the second weight portion 22 are shaved (that is, both ends of the second weight portion 22 are driven by cutting) so as to have a line-symmetrical shape with respect to the second axis of symmetry B2. By forming the second balance processing portion 22a), the position of the center of gravity of the second weight portion 22 along the second symmetry axis B2 direction can be changed.
That is, by setting various shapes, inclination angles, etc. of the second balance processing portion 22a, the center of gravity of the second weight portion 22 is not changed in the direction perpendicular to the second symmetry axis B2, and the second symmetry axis is not changed. Since it can be changed in the B2 direction, it is easy to adjust the position of the center of gravity of the second weight portion 22.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the first weight portion 21 is provided at the front end of the first rotating body 11 in the direction of the first central axis C1, and the second weight portion 22 is the second rotating body. Although it is assumed that it is provided at the front end of the second central axis C2 in the direction of C2, the present invention is not limited to this.
That is, the first weight portion 21 may be provided at the end portion of the first rotating body 11 on the back surface side in the direction of the first central axis C1, or the first rotating body 11 in the direction of the first central axis C1. It may be provided in an intermediate portion located between both ends. Further, the second weight portion 22 may be provided at the rear end of the second rotating body 12 in the direction of the second central axis C2, or may be provided in the second rotating body 12 in the direction of the second central axis C2. It may be provided in an intermediate portion located between both ends.

Further, in the above-described embodiment, the first weight portion 21 is formed in the shape of a semicircular arc-shaped plate, and the second weight portion 22 is formed in the shape of a semicircular plate. The shapes of the portion 21 and the second weight portion 22 are not limited to the above. For example, the first weight portion 21 and the second weight portion 22 may be formed in a polygonal plate shape, a block shape other than the plate shape, or the like.

Further, in the above-described embodiment, in the front view of the reciprocating linear motion mechanism 1, both ends of the first weight portion 21 in the direction perpendicular to the first symmetry axis B1 extend inclined with respect to the first symmetry axis B1. The first balance processing portion 21a is formed respectively, and the second balance processing portion 22a extending at both ends of the second weight portion 22 in the direction perpendicular to the second symmetry axis B2 is inclined with respect to the second symmetry axis B2. Although it is assumed that each is formed, the reference example of the present invention is not limited to this.
For example, the pair of first balance processing portions 21a may be through holes or notches formed in the first weight portion 21 so as to have a line-symmetrical shape with respect to the first symmetry axis B1. Further, the pair of second balance processing portions 22a may be through holes or notches formed in the second weight portion 22 so as to have a line-symmetrical shape with respect to the second symmetry axis B2.

Further, the number of the first balance processing portions 21a formed on the first weight portion 21 is not limited to a pair (two), and may be one or three or more. When the number of the first balance processing portions 21a is one or an odd number of three or more, it is preferable that at least one of the first balance processing portions 21a is arranged on the first axis of symmetry B1. Further, when the number of the first balance processing portions 21a is an even number, an even number of the first balance processing portions 21a may be arranged on the first symmetry axis B1.
Further, the number of the second balance processing portions 22a formed on the second weight portion 22 is not limited to a pair (two), and may be one or three or more. When the number of the second balance processing portions 22a is one or an odd number of three or more, it is preferable that at least one of the second balance processing portions 22a is arranged on the second axis of symmetry B2. Further, when the number of the second balance processing portions 22a is an even number, an even number of the second balance processing portions 22a may be arranged on the second symmetry axis B2.
Further, in the reference example of the present invention , the first balance processing portion 21a may not be formed on the first weight portion 21.
Further, in the reference example of the present invention , the second balance processing portion 22a may not be formed on the second weight portion 22.

Further, in the above-described embodiment, the acting portion 2 connected to the punch sleeve 35 has a cylindrical shape, but the shape of the acting portion 2 may be a cylinder or a sphere other than the cylindrical shape. Good.

In addition, each configuration (component) described in the above-described embodiments, modifications, and notes may be combined as long as the gist of the present invention is not deviated, and addition, omission, replacement, and other configurations may be added. It can be changed. Further, the present invention is not limited by the above-described embodiments, but is limited only by the scope of claims.

According to the reciprocating linear motion mechanism of the present invention and the can forming apparatus using the same, the load on the bearing used in the reciprocating linear motion mechanism can be reduced, the fluctuation of the power consumption can be suppressed to a small value, and the reciprocating output is output to the outside of the mechanism. The accuracy of linear motion can be improved. Therefore, it has industrial applicability.

1 Reciprocating linear motion mechanism 2 Acting part 3 Internal gear 4 Mechanism frame 5 External gear 10 Can molding equipment (DI can manufacturing equipment)
11 1st rotating body 12 2nd rotating body 21 1st weight part 21a 1st balance processing part 22 2nd weight part 22a 2nd balance processing part 30 (31 to 34) Die 30a (31a to 34a) Through hole 30b (31b) ) End face 35 Punch sleeve 36 Cup holder sleeve A Central axis of the working part (center of the working part)
B1 1st symmetry axis B2 2nd symmetry axis C1 1st central axis C2 2nd central axis S Stroke direction (predetermined direction)
V virtual straight line W cup-shaped body (work)

Claims (7)

A mechanical frame with internal gears on the inner peripheral surface,
A first rotating body rotatably supported by the mechanism frame around a first central axis coaxial with the internal gear, and
A second rotating body that is rotatably supported by the first rotating body around a second central axis that is parallel to the first central axis and has an external gear on its outer peripheral surface that meshes with the internal gear.
An action unit provided on the second rotating body and reciprocating linearly along a predetermined direction in the first radial direction orthogonal to the first central axis.
The first weight portion provided on the first rotating body and
A second weight portion provided on the second rotating body is provided .
In the front view of the reciprocating linear motion mechanism viewed from the first central axis direction, the first weight with respect to the first symmetric axis passing through the first central axis and the second central axis in the first radial direction. The part is formed in a line-symmetrical shape,
In front view of the reciprocating linear motion mechanism viewed from the first central axis direction, both ends of the first weight portion in a direction perpendicular to the first symmetry axis are inclined with respect to the first symmetry axis. A reciprocating linear motion mechanism characterized in that each extending first balance processing portion is formed . A mechanical frame with internal gears on the inner peripheral surface,
A first rotating body rotatably supported by the mechanism frame around a first central axis coaxial with the internal gear, and
A second rotating body that is rotatably supported by the first rotating body around a second central axis that is parallel to the first central axis and has an external gear on its outer peripheral surface that meshes with the internal gear.
An action unit provided on the second rotating body and reciprocating linearly along a predetermined direction in the first radial direction orthogonal to the first central axis.
The first weight portion provided on the first rotating body and
A second weight portion provided on the second rotating body is provided.
In the front view of the reciprocating linear motion mechanism viewed from the second central axis direction, the second symmetry passing through the center of the second central axis and the action portion in the second radial direction orthogonal to the second central axis. With respect to the shaft, the second weight portion is formed in a line-symmetrical shape.
In front view of the reciprocating linear motion mechanism viewed from the second central axis direction, both ends of the second weight portion in a direction perpendicular to the second symmetry axis are inclined with respect to the second symmetry axis. A reciprocating linear motion mechanism characterized in that each extending second balance processing portion is formed. The reciprocating linear motion mechanism according to claim 1 or 2 .
The first weight portion is provided at least in a portion of the first rotating body located on the side opposite to the second central axis with respect to the first central axis along the first radial direction.
The second weight portion is provided at least in a portion of the second rotating body located on the side opposite to the acting portion from the second central axis along the second radial direction orthogonal to the second central axis. A reciprocating linear motion mechanism characterized by being The reciprocating linear motion mechanism according to any one of claims 1 to 3 .
Derived from the first rotating body and the second rotating body over the entire length of the stroke in which the acting portion reciprocates linearly along the predetermined direction in a front view of the reciprocating linear motion mechanism viewed from the first central axis direction. A reciprocating linear motion mechanism characterized in that the center of gravity is arranged close to a virtual straight line extending in a predetermined direction. The reciprocating linear motion mechanism according to claim 4 .
A reciprocating linear motion mechanism characterized in that the distance between the virtual straight line and the center of gravity is 0.1 mm or less in a front view of the reciprocating linear motion mechanism viewed from the first central axis direction. The reciprocating linear motion mechanism according to claim 4 or 5 .
A front view of the reciprocating linear motion mechanism viewed from the first central axis direction, characterized in that the distance between the virtual straight line and the center of gravity is 0.1% or less of the total stroke of the acting portion. Linear motion mechanism. The reciprocating linear motion mechanism according to any one of claims 1 to 6 .
A punch sleeve connected to the action portion of the reciprocating linear motion mechanism, and
A die having a through hole through which the punch sleeve is inserted, and a die
It is characterized by including a cup holder sleeve that is inserted into a cup-shaped body arranged on an end face through which the through hole of the die opens and presses the bottom wall of the cup-shaped body against the end face to fix the cup-shaped body. Can molding equipment.

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