JP2018054065A - Reciprocating linear motion mechanism and can molding equipment - Google Patents

Abstract

A reciprocating linear motion mechanism capable of reducing the load on bearings used in the reciprocating linear motion mechanism, suppressing fluctuations in power consumption, and increasing the accuracy of the reciprocating linear motion output to the outside of the mechanism. To provide a can forming apparatus using A mechanism frame (4) having an internal gear (3) on its inner peripheral surface; a first rotating body (11) supported by the mechanism frame (4) so as to be rotatable around a first central axis (C1) coaxial with the internal gear (3); A second rotating body rotatably supported by a first rotating body 11 about a second central axis C2 separated parallel to the first central axis C1 and having an external gear 5 meshing with the internal gear 3 on its outer peripheral surface. 12, an action portion 2 provided on the second rotating body 12 and performing reciprocating linear motion along a predetermined direction in a first radial direction perpendicular to the first central axis C1; A first weight portion 21 and a second weight portion 22 provided on the second rotating body 12 are provided. [Selection drawing] Fig. 3

Description

  The present invention relates to a reciprocating linear motion mechanism that is used, for example, in the manufacture of a DI can and converts a rotational motion input from the outside of the mechanism into a reciprocating linear motion and outputs the same to the outside of the mechanism, and a can molding apparatus using the same.

  A bottomed cylindrical DI can having a can body (wall) and a bottom (bottom) as a can that is filled and sealed with beverages and the like, and a disc that is wound around the open end of the DI can A two-piece can having a can-shaped can lid is known. Also known is a bottle can in which a DI can is subjected to necking processing, screw processing, and the like, and a cap is screwed onto an opening end portion thereof.

  The DI can used in such a can body has a bottomed cylinder by performing a cupping process (drawing process) and a DI process (drawing and squeezing process) on a disc-shaped blank punched from a plate material such as an aluminum alloy material. It is formed in a shape.

  Specifically, in the cupping step, the blank is subjected to cupping (drawing) to obtain a cup-shaped body that is a molding intermediate in the process of shifting from the blank to the DI can. 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 drawn and ironed between them. That is, DI (Drawing & Ironing) processing is performed on the cup-shaped body to obtain a DI can.

As a can forming apparatus for performing DI processing on a cup-shaped body to form a DI can, for example, those described in Patent Documents 1 and 2 below are known.
The can forming apparatuses of Patent Documents 1 and 2 have a large gear having inner peripheral teeth, a pitch circle diameter that is the same as the pitch circle radius of the large gear, and meshes with the inner peripheral teeth of the large gear. A small gear that moves along the large gear, a drive mechanism that is coupled to the small gear and revolves the small gear about the axis of the large gear, and is rotatably provided on the pitch circle of the small gear. The punch is made up of.
Then, with the small gear having the same diameter as the pitch circle radius of the large gear meshed with the inner peripheral teeth of the large gear, the small gear is centered on the axis of the large gear by the drive mechanism. When revolved, this small gear rotates along with the revolving, and a trajectory in which one point on the pitch circle of the small gear reciprocates on the diameter of the pitch circle of the large gear is drawn. As a result, the pitch circle of the small gear A punch, which is rotatably provided at an upper point, reciprocates linearly.

JP-A-6-71351 JP-A-6-71352

However, the conventional can molding apparatus has the following problems.
The can forming apparatus is provided with a punch driving mechanism (reciprocating linear motion mechanism) for reciprocating linear motion of a punch (punch sleeve). Various bearings used in this reciprocating linear motion mechanism were subject to a load (reaction force) during operation of the apparatus, and easily generated heat or vibrated. For this reason, the amount of coolant used for cooling and lubricating the bearing has to be increased, and the life of the bearing is affected. Further, when the bearing is subjected to a large load, the power consumption of the reciprocating linear motion mechanism fluctuates greatly, 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 is capable of reducing the load on the bearing used in the reciprocating linear motion mechanism, minimizing fluctuations in power consumption, and outputting the reciprocating linear output to the outside of the mechanism. It is an object of the present invention to provide a reciprocating linear motion mechanism that can increase the accuracy of motion and a can molding apparatus using the same.

A reciprocating linear motion mechanism according to an aspect of the present invention includes a mechanism frame having an internal gear on an inner peripheral surface thereof, and a first frame supported by the mechanism frame so as to be rotatable about a first central axis coaxial with the internal gear. A first rotating body and an outer gear that is supported by the first rotating body so as to be rotatable about a second central axis that is spaced in parallel to the first central axis and that meshes with the internal gear on the outer peripheral surface. Two rotating bodies, an action portion that is provided on the second rotating body and that reciprocates linearly along a predetermined direction in a first radial direction orthogonal to the first central axis, and is provided on the first rotating body. The first weight portion and the second weight portion provided on the second rotating body are provided.
Further, the can molding apparatus according to an aspect of the present invention includes the above-described reciprocating linear motion mechanism, a punch sleeve connected to the action portion of the reciprocating linear motion mechanism, and a through-hole through which the punch sleeve is inserted. And a cup holder sleeve that is inserted into a cup-like body disposed on an end face where the through-hole of the die opens, and presses and fixes the bottom wall of the cup-like body against the end face. It is characterized by that.

  In the reciprocating linear motion mechanism and the can molding 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 is moved to the first center with respect to the mechanism frame. It can be rotated around the axis. When the first rotating body is rotated about the first central axis, the second rotating body supported by the first rotating body is also rotated about 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 engaged with each other, the second rotating body is rotated (revolved) around the first central axis, and the second center It can also be rotated (rotated) around its axis. In addition, in the front view of the reciprocating linear motion mechanism viewed from the first central axis direction (which may be referred to as the second central axis direction; the same applies hereinafter), the rotational direction in which the second rotating body is revolved around the first central axis. The directions of rotation about the second central axis are opposite to each other.

Thereby, the action part provided in the 2nd rotating body reciprocates linearly along a predetermined direction (for example, horizontal direction) among the 1st diameter directions orthogonal to the 1st 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 action part. Output to the outside.
Therefore, by connecting the punch sleeve to this action portion, the punch sleeve can be reciprocated linearly in a predetermined direction, and DI processing is applied to the cup-shaped body using this punch sleeve, die, cup holder sleeve, etc. And can be formed 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 part and the second weight part are used as so-called counterweights.
Therefore, when the first rotating body and the second rotating body are rotated about the first central axis and the second rotating body is rotated about the second central axis with respect to the mechanism frame, Due to the balance action of the first weight part and the second weight part, the weight balance of the first and second 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 rotated in the first radial direction over the entire rotation of the first central axis. Can be arranged close to a virtual straight line extending in a predetermined direction (that is, the stroke trajectory of the action 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.
Note that the position of the center of gravity can be obtained by analysis using, for example, three-dimensional CAD software or spreadsheet software. At this time, the first weight part and the second weight are confirmed while checking the position of the center of gravity at every predetermined angle around the first central axis when the reciprocating linear motion mechanism is operated (for example, every 360 ° over the entire circumference of 360 °). By adjusting each shape and the like of the part, the balance function can be improved over the entire circumference around the first central axis (that is, over the entire stroke of the action part), which is preferable.

  ADVANTAGE OF THE INVENTION According to this invention, the load (reaction force) to the various bearings used for a reciprocating linear motion mechanism can be suppressed stably, and the heat_generation | fever and vibration of a bearing can be suppressed. The various bearings include a bearing that rotatably supports the first rotating body with respect to the mechanism frame, and a bearing that rotatably supports the second rotating body with respect to the first rotating body. And the usage-amount of the coolant liquid used for cooling and lubrication of a bearing can be reduced, and the lifetime of a bearing is extended. In addition, since the load on the bearing can be reduced, fluctuations in the power consumption of the reciprocating linear motion mechanism can be kept small, and the accuracy of the reciprocating linear motion output to the outside of the mechanism can be stably increased.

  In the reciprocating linear motion mechanism, the first weight portion is located at least on the opposite side of the first central axis along the first radial direction to the second central axis in the first rotating body. 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 perpendicular to the second central axis. It is preferable that it is provided in the part located in.

  In this case, a first weight portion is provided in a portion of the first rotating body that is located on the opposite side of the first central axis along the first radial direction from the second central axis. That is, in the first rotator, the second rotator and the first weight portion are arranged so as to be in positions opposite to each other (180 ° rotationally symmetric position) with the first central axis as a center. 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 is arranged with the second rotating body around the first central axis. The balance with the first weight portion reduces the load on the bearing that pivotally supports the first rotating body.

  Moreover, the 2nd weight part is provided in the part located in the opposite side to an action part rather than the 2nd central axis along the 2nd radial direction orthogonal to a 2nd central axis among 2nd rotary bodies. In other words, in the second rotating body, the action portion and the second weight portion are arranged so as to be in positions opposite to each other (180 ° rotationally symmetric position) around the second central axis. Accordingly, when the second rotating body is rotated about the second central axis, the action portion and the second weight portion are balanced about the second central axis in the second rotating body, so that the second rotation is performed. The load on the bearing that pivotally supports the body is reduced.

Further, focusing attention on the positional relationship between the first weight part and the second weight part, the first weight part and the second weight part are sandwiched by an imaginary straight line (stroke locus of the action part) extending in a predetermined direction in the first radial direction. The two weight parts move so as to maintain the state of being located on the opposite sides (specifically, as shown in FIGS. 7 to 10, for example, the first weight part 21 and the second weight part). The portion 22 moves so as to balance up and down around a virtual straight line V extending on the horizontal axis X).
That is, the first weight portion and the second weight portion move while balancing each other across the virtual straight line. Accordingly, it is possible to effectively suppress loads on various bearings used in the reciprocating linear motion mechanism, and the above-described operational effects become more remarkable.

  In the reciprocating linear motion mechanism, the first rotation is performed over the entire stroke of the reciprocating linear motion along the predetermined direction in the front view of the reciprocating linear motion mechanism as viewed from the first central axis direction. It is preferable that the center of gravity derived from the body and the second rotating body is arranged close to a virtual straight line extending in the predetermined direction.

  In this case, variation in the weight balance in the direction perpendicular to the predetermined direction (virtual straight line) in the first radial direction can be suppressed over the entire stroke of the action portion. As a result, the variation in weight balance in the predetermined direction is also reduced.

  In the reciprocating linear motion mechanism, it is preferable that a 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.

  In this case, 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 over the entire stroke of the action portion. Since the distance (distance in the direction perpendicular to the stroke direction) is suppressed to 0.1 mm or less, variation in weight balance in the direction perpendicular to the stroke direction can be suppressed to a small value.

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

  In this case, 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 over the entire stroke of the action portion. Since the distance (distance in the direction perpendicular to the stroke direction) is suppressed to 0.1% or less of the entire length of the stroke, variation in weight balance in the direction perpendicular to the stroke direction can be suppressed to a small value.

Further, in the reciprocating linear motion mechanism, the first reciprocating linear motion mechanism viewed from the first central axis direction is a first view passing through the first central axis and the second central axis in the first radial direction. The first weight portion is preferably formed in a line-symmetric shape with respect to one symmetry axis.
In the reciprocating linear motion mechanism, the second central axis and the second central axis out of a second radial direction orthogonal to the second central axis in a front view of the reciprocating linear motion mechanism viewed from the second central axis direction. It is preferable that the second weight portion is formed in a line-symmetric shape with respect to a second axis of symmetry passing through the center of the action portion.

  In this case, in the front view of the reciprocating linear motion mechanism, the first weight part and the second weight part have a line symmetrical shape, so that the balance of the first weight part itself and the balance of the second weight part itself are good. Can be maintained. Further, the balance of the entire first rotating body and the balance of the entire second rotating body can be improved. Thereby, the dispersion | variation in the weight balance to the direction perpendicular | vertical to a stroke direction can be suppressed small, and the dispersion | variation in the weight balance to a stroke direction can also be suppressed small.

  Further, in the reciprocating linear motion mechanism, the first reciprocating linear motion mechanism viewed from the first central axis direction in front view of the first weight portion at both ends of the first weight portion in a direction perpendicular to the first symmetry axis. It is preferable that the 1st balance process part extended inclining with respect to 1 symmetry axis is formed, respectively.

In this case, in a front view of the reciprocating linear motion mechanism, first balance processing portions that are inclined with respect to the first symmetry axis are formed at both ends of the first weight portion in a direction perpendicular to the first symmetry axis. Therefore, while cutting both ends of the first weight portion so as to have a line symmetrical shape with respect to the first symmetry axis (that is, by driving the both ends of the first weight portion by cutting and forming the first balance processing portion). The gravity center position of the first weight portion along the first symmetry axis direction can be changed.
That is, by setting the shape, inclination angle, etc. of the first balance processed portion in various ways, 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, it is easy to adjust the position of the center of gravity of the first weight portion.

  In the reciprocating linear motion mechanism, the first reciprocating linear motion mechanism as viewed from the second central axis direction is viewed from the front at both ends of the second weight portion in the direction perpendicular to the second symmetry axis. It is preferable that the 2nd balance process part extended inclining with respect to 2 symmetry axes is formed, respectively.

In this case, in a front view of the reciprocating linear motion mechanism, second balance processing portions that are inclined with respect to the second symmetry axis are formed at both ends of the second weight portion in a direction perpendicular to the second symmetry axis. Therefore, while cutting both ends of the second weight portion so as to have a line symmetrical shape with respect to the second symmetry axis (that is, by driving the both ends of the second weight portion by cutting and forming the second balance processing portion). The position of the center of gravity of the second weight portion along the second symmetry axis direction can be changed.
That is, by setting the shape, inclination angle, etc. 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, it is easy to adjust the position of the center of gravity of the second weight portion.

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

It is the schematic which shows the can shaping | 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 shaping | molding apparatus. It is a longitudinal cross-sectional view of a reciprocating linear motion mechanism. It is a longitudinal cross-sectional view of a reciprocating linear motion mechanism, and illustrations of members other than the internal gear in the mechanism frame are omitted. It is a partial permeation | transmission perspective view explaining the internal structure of a reciprocating linear motion mechanism. It is a perspective view which shows the modification of a reciprocating linear motion mechanism. It is a figure explaining operation | movement of a reciprocating linear motion mechanism. It is a figure explaining operation | movement of a reciprocating linear motion mechanism. It is a figure explaining operation | movement of a reciprocating linear motion mechanism. It is a figure explaining operation | movement of a reciprocating linear motion mechanism.

Hereinafter, a reciprocating linear motion mechanism 1 and a can molding apparatus 10 according to an 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 molding apparatus (DI can manufacturing apparatus) 10 that performs DI processing on a cup-shaped body W that is a workpiece to form a DI can.

First, the DI can will be described.
The DI can is used for a can (a two-piece can or a bottle can) filled and sealed with contents such as a beverage. In the case of a two-piece can, the can body includes a bottomed cylindrical DI can and a disc-shaped can lid that is wound around the open end of the DI can. In the case of a bottle can, the can body includes a bottle can main body obtained by subjecting a DI can to necking processing, screw processing, and the like, and a cap screwed to the opening end portion thereof. “DI” in the DI canister is an abbreviation for Drawing & Ironing.

  The DI can is formed into a bottomed cylindrical shape by performing a cupping process (drawing process) and a DI process (drawing and ironing process) on a disk-shaped blank punched out of a plate material such as an aluminum alloy material. Specifically, in the case of a two-piece can, for example, the DI can is manufactured through a plate material punching process, a cupping process, a DI process, a trimming process, a printing process, a painting process, a necking process, and a flanging process in this order.

  In the process of manufacturing the DI can, the blank is drawn by a cupping press (a cupping process) and formed into a cup-shaped body W. That is, the cup-shaped body W is a molded intermediate body produced in the process of shifting from a blank to a DI can in the cupping step. The cup-shaped body W has a bottomed cylindrical shape in which the height of the peripheral wall (the 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 molding apparatus 10 is used in the DI process, and performs DI processing (drawing (redrawing) ironing) on the cup-shaped body W to form a DI can.

  In FIG. 1, a can forming apparatus 10 has 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 through a ram shaft, and the punch sleeve 35 inserted therethrough. The die 30 in which the through-hole 30a is formed and the cup-shaped body W disposed in the end surface 30b where the through-hole 30a of the die 30 is opened are inserted, and the bottom wall of the cup-shaped body W is pressed against the end surface 30b. And a cup holder sleeve 36 to be fixed.

  The punch sleeve 35 has a cylindrical or columnar shape, 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 into the through hole 30a. Specifically, the action portion 2 of the reciprocating linear motion mechanism 1 reciprocates linearly along the center axis direction of the punch sleeve 35 and the die 30 as shown by the bidirectional arrow S in FIG. The punch sleeve 35 reciprocates linearly with respect to the die 30. The stroke total length of the action part 2 in the stroke direction S (direction along a 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 relative to the die 30 is shown larger than the stroke (movement amount) of the reciprocating linear motion in the stroke direction S of the action portion 2. The strokes are the same.

In the example of the present 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 redraw die 31 having a through hole 31a having a circular cross section, and through holes 32a, 33a, and 34a that are arranged coaxially with the redraw die 31 and have a circular cross section. A plurality of (three in the illustrated example) ironing dies (sieving dies) 32, 33, and 34 are included. In addition, pilot rings 37 are respectively arranged on the opposite side of the reciprocating linear motion mechanism 1 along the central axis direction of the respective ironing dies 32 to 34. By providing the pilot ring 37, the punch sleeve 35 is prevented from coming into contact with the dies 32 to 34 due to an impact when the can is detached from the ironing dies 32 to 34 at the time of molding.
Further, a coolant liquid is supplied to the redraw die 31 and the ironing dies 32 to 34 during the molding for lubrication and cooling.

  The cup holder sleeve 36 has a cylindrical shape, is fitted outside the punch sleeve 35, and is slidable 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 in a redrawing die 31 arranged closest to the reciprocating linear motion mechanism 1 along the stroke direction S among the plurality of dies 30. The bottom wall can be pressed.

The central axes of the plurality of dies 30 (redraw die 31 and ironing dies 32 to 34), punch sleeve 35, and cup holder sleeve 36 described above are coaxial with each other and extend in the horizontal direction.
As these die | dye 30, punch sleeve 35, and cup holder sleeve 36, what was described in Unexamined-Japanese-Patent No. 2007-216302 can be used, for example.

DI processing to the cup-shaped body W by the can molding apparatus 10 is performed as follows.
First, a cup-shaped body W, which is a workpiece, is disposed between the punch sleeve 35 and the redraw die 31 with the cup shaft (can shaft) extending in the horizontal direction and the opening directed toward the punch sleeve 35. The The bottom wall of the cup-shaped body W is disposed close to or in contact with the end face 31 b of the redraw die 31.

  The cup holder sleeve 36 and the punch sleeve 35 move forward relative to the cup-shaped body W (specifically, move toward the opposite side of the reciprocating linear motion mechanism 1 along the stroke direction S). And while the cup holder sleeve 36 presses the bottom wall of the cup-shaped body W against the end face 31b of the re-drawing die 31, and performs the cup pressing operation, the punch sleeve 35 pulls the cup-shaped body W through the through-hole 31a of the re-drawing die 31. Push it in and redraw.

  By redrawing, the cup-shaped body W is formed into a small diameter, and the length (height) along the cup axis direction is formed large. Subsequently, the cup-shaped body W is pushed in by the punch sleeve 35 and gradually ironed while sequentially passing through the through holes 32a to 34a of the plurality of ironing dies 32 to 34. That is, the peripheral wall of the cup-shaped body W is squeezed to extend the peripheral wall, the peripheral wall height is increased and the wall thickness is decreased to form a bottomed cylindrical DI can. This DI can is cold worked and hardened by squeezing the peripheral wall, and the strength is increased.

  In the DI can that has been ironed, the punch sleeve 35 is further pushed forward and the bottom (portion that becomes the bottom of the can) is pressed against a bottom molding die (not shown) so that the bottom is formed into a dome shape.

Moreover, the can molding apparatus 10 is provided with the following structure etc. which are not shown in particular other than the structure mentioned above.
The can molding apparatus 10 includes a ram shaft that is connected to the punch sleeve 35 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 was obtained by ejecting gas from the tip of the gas ejection hole formed in the punch sleeve 35 and a cup holder driving mechanism that reciprocates linearly in the stroke direction S in synchronization with the punch sleeve 35. A gas discharge mechanism for releasing the DI can from the tip of the punch sleeve 35 and a can carrying out mechanism for carrying out the DI can released from the punch sleeve 35 to the outside of the apparatus are provided.
The above-described members and mechanisms are supported by the apparatus frame of the can molding apparatus 10. As these members and mechanisms, for example, those described in Patent Document 1 (JP-A-6-71351) and 2 (JP-A-6-71352) described above can be used.

Next, the reciprocating linear motion mechanism 1 will be described.
2 to 5, the reciprocating linear motion mechanism 1 includes a mechanism frame 4 having an internal gear 3 on an inner peripheral surface and a mechanism frame 4 that is rotatable about a first central axis C <b> 1 coaxial with the internal gear 3. An external gear that is supported by the first rotary body 11 and is rotatably supported about the second central axis C2 that is spaced parallel to the first central axis C1 and meshes with the internal gear 3. Reciprocating linear motion along a predetermined direction (stroke direction S) of the second rotating body 12 having the outer peripheral surface 5 and the first radial direction provided on the second rotating body 12 and orthogonal to the first central axis C1. And a second weight portion 22 provided on the second rotating body 12, and a first weight portion 21 provided on the first rotating body 11.

  The reciprocating linear motion mechanism 1 is provided with various bearings. In FIG. 3, the various bearings are provided on the mechanism frame 4, and the bearings 8 and 9 pivotally support the first rotating body 11 around the first central axis C <b> 1 with respect to the mechanism frame 4. Bearings 13, 14 provided on the first rotating body 11 and rotatably supporting the second rotating body 12 around the second central axis C <b> 2 with respect to the first rotating body 11, and provided on the outer periphery of the action portion 2. And a bearing 15 that pivotally supports the action portion 2 around its central axis A with respect to a ram shaft (not shown).

  As shown in FIG. 3, the mechanism frame 4 has a multistage cylindrical shape. The mechanism frame 4 includes a large-diameter cylindrical portion 6 and a small-diameter cylindrical 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 cylindrical portion 7 to the large diameter cylindrical portion 6 along the first central axis C1 direction is referred to as a front side (one side), and the direction from the large diameter cylindrical portion 6 to the small diameter cylindrical portion 7 is the back side. (The other side).

A direction orthogonal to the first central axis C1 is referred to as a first radial direction. Of the first radial direction, the direction approaching the first central axis C1 is referred to as the inner side of the first radial direction, and the direction away from the first central axis C1 is referred to as the outer side of the first radial direction.
In addition, a direction that goes around the first central axis C1 is referred to as a first circumferential direction. Of the first circumferential direction, the direction in which the first rotating body 11 is rotated with respect to the mechanism frame 4 during operation of the mechanism 1 is referred to as a rotation direction T1 of the first rotating body 11.

A direction orthogonal to the second central axis C2 is referred to as a second radial direction. Of the second radial directions, the direction approaching the second central axis C2 is referred to as the inner side of the second radial direction, and the direction away from the second central axis C2 is referred to as the outer side of the second radial direction.
In addition, a direction around the second central axis C2 is referred to as a second circumferential direction. Of the second circumferential direction, the direction in which the second rotating body 12 is rotated with respect to the first rotating body 11 during operation of the mechanism 1 is referred to as a rotation direction T2 of the second rotating body 12.

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

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

An end of the small diameter portion 17 on the back side in the first central axis C1 direction protrudes from the small diameter cylindrical portion 7 toward the back side, and a rotation direction transmitted from a drive motor (not shown) to the end portion. The rotational driving force to T1 is input.
A cylindrical hole-shaped chamber 18 extending along the second central axis C2 is formed on the second central axis C2 spaced from the first central axis C1 in the large-diameter portion 16. The second rotating body 12 is accommodated. A pair of bearings 13 and 14 are disposed at both ends of the inner periphery 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. Yes. The external gear 5 of the second rotating body 12 is disposed 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 this embodiment, the 2nd rotary body 12 consists of steel materials etc., for example, and has comprised the cylindrical shape (multistage cylindrical shape). The second rotating body 12 is formed of a material having a specific gravity (density) larger than that of the first rotating body 11. Outer gear 5 is arranged in a portion corresponding to internal gear 3 of mechanism frame 4 along the second central axis C2 direction on the outer periphery of second rotating body 12.

  As shown in FIGS. 3 to 5, the external gear 5 meshes with the internal gear 3, and rotates in the rotational direction T <b> 1 around the first central axis C <b> 1 along the inner periphery of the internal gear 3 ( (Revolution) while rotating (rotation) in the rotation direction T2 around the second central axis C2. The pitch circle diameter of the external gear 5 is ½ of the pitch circle diameter of the internal gear 3.

  In the example of this embodiment, the action part 2 has a cylindrical shape. When the reciprocating linear motion mechanism 1 is viewed from the direction of the first central axis C <b> 1, the central axis A of the action portion 2 is disposed on the pitch circle diameter of the external gear 5. The central axis A of the action part 2 is spaced in parallel to 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 is equal to the distance (the distance along the first radial direction or the second radial direction). The action portion 2 is disposed so as to protrude from the mechanism frame 4 toward the front side in the direction of the first central axis C1.

2-4, the 1st weight part 21 and the 2nd weight part 22 are what is called counterweight used in order to adjust the weight balance of the 1st rotary body 11 and the 2nd rotary body 12. In FIG.
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 end portion on the front side 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 disposed at the same position along the direction of the first central axis C1. However, since the second weight portion 22 circulates inside 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 that is located on the opposite side of the second central axis C2 from the first central axis C1 along the first radial direction. Further, the second weight portion 22 is provided at least on a portion of the second rotating body 12 that is located on the opposite side of the action portion 2 from 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 plate shape and is detachably attached to the first rotating body 11. 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, when the reciprocating linear motion mechanism 1 is viewed from the direction of the first central axis C1 and the second central axis C2 in the front view of the reciprocating linear motion mechanism 1, of the first radial direction, With respect to the first symmetry axis B1 passing through the first central axis C1 and the second central axis C2, the first weight portion 21 is formed in a line symmetrical shape. Further, in this front view, with respect to the second axis of symmetry B2 passing through the second central axis C2 and the central axis A of the action part 2 (the center of the action part 2) in the second radial direction, It is formed symmetrically.
7 (a) to (c), FIGS. 8 (a) to (c), FIGS. 9 (a) to (c) and FIGS. 10 (a) to (c) are shown in this order in the reciprocating linear motion mechanism. 1 represents the operation at the time of operation. 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. (Revolution) and the state of the second rotating body 12 (and its second weight portion 22) rotating (spinning) along the rotational direction T2 around the second central axis C2 It is displayed over the entire 360 ° per 30 ° around C1.

  2 to 4, in the front view of the reciprocating linear motion mechanism 1, the first weight portion 21 has both end portions in the direction perpendicular to the first symmetry axis B1 with respect to the first symmetry axis B1. A first balance processing portion 21a extending in an inclined manner is formed. Further, in this front view, second balance processing portions 22a extending at an inclination 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 increase from the first central axis C1 toward the second central axis C2 along the first symmetry axis B1 direction. It extends while 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 gradually approach each other as they go from the first central axis C1 toward the second central axis C2 along the direction of the first symmetry axis B1. .

  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 while inclining 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 gradually approach each other as they go from the second central axis C2 toward the central axis A side of the action portion 2 along the second symmetry axis B2. ing.

  Note that the shapes, sizes, and the like of the first weight portion 21 and the second weight portion 22 are not limited to the example of the present embodiment described above. 6 to 10 show a modified example of the present embodiment. In this modified example, the first weight part 21 and the second weight part 22 are different from those shown in FIGS. 2 to 4. Each is formed large. In this modification, the second balance portion 22 a is not formed on the second weight portion 22. As described above, the shapes and sizes of the first weight part 21 and the second weight part 22 may be variously set.

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

More specifically, in a front view of the reciprocating linear motion mechanism 1 viewed from the direction of the first central axis C1, the distance between the virtual straight line V and the center of gravity (the distance along the vertical axis Y) is 0.1 mm or less. 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 action portion 2.
Note that the position of the center of gravity can be obtained by analysis using, for example, three-dimensional CAD software or spreadsheet software. At this time, for each predetermined angle around the first central axis C1 when the reciprocating linear motion mechanism 1 is operated (for example, 360 ° over the entire circumference every 1 °), the first weight portion 21 and the position of the center of gravity are confirmed. By adjusting each shape and the like of the second weight portion 22 (the shape of the first balance processing portion 21a and the second balance processing portion 22a described above), 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 length), which is preferable.

  In the reciprocating linear motion mechanism 1 and the can molding apparatus 10 of the present embodiment described above, when a 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 FIG. 1, 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 about the first central axis C1, the second rotating body 12 supported by the first rotating body 11 is also rotated about 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 rotates (revolves) around the first central axis C1. While being rotated, it is also rotated (rotated) around the second central axis C2. In addition, the second rotating body 12 revolves around the first central axis C1 in a front view of the reciprocating linear motion mechanism 1 as viewed from the first central axis C1 direction (which may be referred to 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 about the second central axis C2 are opposite to each other.

Thereby, the action part 2 provided in the 2nd rotary body 12 is a reciprocating straight line along the predetermined direction (the horizontal axis X direction in the example of this embodiment) among the 1st radial directions orthogonal to the 1st central axis C1. Exercise. That is, the reciprocating linear motion mechanism 1 of the present embodiment converts the rotational driving force (rotational motion) input from the outside of the mechanism 1 to the first rotating body 11 into the reciprocating linear driving force (reciprocating linear motion), and the action portion 2 to the outside of the mechanism 1 is output.
Therefore, by connecting the punch sleeve 35 to the operating portion 2 via a ram shaft or the like, the punch sleeve 35 can be reciprocated linearly in a predetermined direction (stroke direction S extending on the horizontal axis X). The cup-shaped body W is subjected to DI processing using the punch sleeve 35, the die 30, the cup holder sleeve 36, and the like, and can be formed into a DI can.

In the present embodiment, the first weight body 21 is provided on the first rotating body 11, and the second weight section 22 is provided on the second rotating body 12.
Accordingly, the first rotating body 11 and the second rotating body 12 are rotated about the first central axis C1 with respect to the mechanism frame 4, and the second rotating body 12 is rotated about the second central axis C2. As a result, the balance between the first weight portion 21 and the second weight portion 22 can keep the weight balance of the first and second rotating bodies 11 and 12 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 rotated over the entire circumference of the first central axis C1. The virtual straight line V (that is, the stroke trajectory of the action part 2) extending in a predetermined direction in the first radial direction can be disposed close to the first central axis C1. Further, the center of gravity of the second rotating body 12 can be disposed close to the second central axis C2 over one rotation (entire circumference) around the second central axis C2.

  Therefore, according to this embodiment, the load (reaction force) to various bearings used in the reciprocating linear motion mechanism 1 can be stably suppressed, and heat generation and vibration of the bearing can be suppressed. The various bearings mentioned above are bearings 8 and 9 that rotatably support the first rotating body 11 with respect to the mechanism frame 4, and a shaft that rotatably supports the second rotating body 12 with respect to the first rotating body 11. Bearings 13, 14 and so on. And the usage-amount of the coolant liquid used for cooling and lubrication of a bearing can be reduced, and the lifetime of a bearing is extended. Further, since the load on the bearing can be reduced, fluctuations in the power consumption of the reciprocating linear motion mechanism 1 can be kept small, and the accuracy of the reciprocating linear motion output to the outside of the mechanism 1 can be stably increased. .

  In the present embodiment, the first weight portion 21 is provided at least on the portion of the first rotating body 11 that is located on the opposite side of the second central axis C2 from the first central axis C1 along the first radial direction. It has been. Further, the second weight portion 22 is provided at least in a portion of the second rotating body 12 that is located on the opposite side of the action portion 2 (the central axis A) from the second central axis C2 along the second radial direction. It has been. Therefore, the following effects are exhibited.

  That is, in this case, the first weight portion 21 is provided in a portion of the first rotating body 11 located on the opposite side of the first central axis C1 along the first radial direction from the second central axis C2. . That is, in the first rotating body 11, the second rotating body 12 and the first weight portion 21 are disposed so as to be opposite to each other (180 ° rotationally symmetric position) around the first central axis C <b> 1. Accordingly, 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. Since the second rotating body 12 and the first weight portion 21 are balanced, the load on the bearings 8 and 9 that pivotally support the first rotating body 11 is reduced.

  In addition, a second weight portion 22 is provided in a portion of the second rotating body 12 that is located on the opposite side of the action portion 2 from the second central axis C2 along the second radial direction. That is, in the second rotating body 12, the action part 2 and the second weight part 22 are arranged so as to be opposite to each other (180 ° rotationally symmetric position) around the second central axis C2. Therefore, when the second rotating body 12 is rotated around the second central axis C2, the action portion 2 and the second weight portion 22 are balanced about 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, focusing on the positional relationship between the first weight portion 21 and the second weight portion 22, the first straight direction V (the stroke locus of the action portion 2) extending in a predetermined direction in the first radial direction is interposed between the first weight portion 21 and the second weight portion 22. The weight part 21 and the second weight part 22 move so as to maintain a state where they are located on opposite sides. Specifically, in the present embodiment, as shown in FIGS. 7 to 10, the first weight portion 21 and the second weight portion 22 are vertically moved around the virtual straight line V extending on the horizontal axis X (vertical axis). Move in a balanced way (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 ( FIGS. 7A to 7C and FIGS. 10B and 10C). 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 (FIG. 8B, ( c) and FIGS. 9A to 9C). 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 balancing each other across the virtual straight line V. Therefore, the load on various bearings used in the reciprocating linear motion mechanism 1 can be effectively suppressed, and the above-described operational effects become more remarkable.

In the present embodiment, the first rotation is performed over the entire stroke in which the action portion 2 reciprocates linearly along a predetermined direction (stroke direction S) in a front view of the reciprocating linear motion mechanism 1 viewed from the direction of the first central axis C1. 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 operational effects are obtained.
That is, in this case, variation in 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) can be suppressed over the entire stroke of the action portion 2. Accordingly, the variation in weight balance in the predetermined direction (in the example of the present embodiment, the horizontal axis X direction) is also reduced.

  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 first radial direction over the entire stroke length of the action portion 2 when viewed from the front. And the center of gravity derived from the second rotating body 12 (the 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 kept 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 first radial direction over the entire stroke length of the action portion 2 when viewed from the front. And the center of gravity derived from the second rotating body 12 (distance in the direction perpendicular to the stroke direction S. In the example of this embodiment, the distance in the vertical axis Y direction) is 0.1% of the total stroke length. Since the following is suppressed, variation in the weight balance in the direction perpendicular to the stroke direction S can be reduced.

  In the present embodiment, the first symmetric axis B1 passing through the first central axis C1 and the second central axis C2 in the first radial direction in a front view of the reciprocating linear motion mechanism 1 viewed from the direction of the first central axis C1. The first weight portion 21 is formed in a line symmetrical shape. In addition, in a front view of the reciprocating linear motion mechanism 1 as viewed from the direction of the second central axis C2, a second symmetry axis passing through the second central axis C2 and the center of the action part 2 (central axis A) in the second radial direction. Regarding B2, the second weight portion 22 is formed in a line-symmetric shape. Therefore, the following effects are exhibited.

  That is, in this case, since the first weight portion 21 and the second weight portion 22 have a line-symmetric 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. These balances 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. Thereby, 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) is suppressed, and the stroke direction S (the horizontal axis X direction in the example of the present embodiment) is suppressed. The variation in the weight balance can also be kept small.

In the present embodiment, the first balance processing is inclined at the both ends of the first weight portion 21 in the direction perpendicular to the first symmetry axis B1 in the front view of the reciprocating linear motion mechanism 1 with respect to the first symmetry axis B1. Since the portions 21a are respectively formed, both ends of the first weight portion 21 are scraped so as to be line-symmetrical with respect to the first symmetry axis B1 (that is, both ends of the first weight portion 21 are driven by cutting). 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 the shape, inclination angle, and the like of the first balance processing portion 21a in various ways, the center of gravity of the first weight portion 21 is not changed in the direction perpendicular to the first symmetry axis B1, and thus the first symmetry axis. Since it can be changed in the B1 direction, the position of the center of gravity of the first weight portion 21 can be easily adjusted.

In the present embodiment, the second balance processing is inclined at the both ends of the second weight portion 22 in the direction perpendicular to the second symmetry axis B2 in the front view of the reciprocating linear motion mechanism 1 with respect to the second symmetry axis B2. Since the portions 22a are respectively formed, both ends of the second weight portion 22 are cut so as to be line-symmetrical with respect to the second symmetry axis B2 (that is, both ends of the second weight portion 22 are driven by cutting). By forming the second balance processing portion 22a), the position of the center of gravity of the second weight portion 22 along the direction of the second axis of symmetry B2 can be changed.
That is, by setting the shape and inclination angle of the second balance processing portion 22a in various ways, 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. Since it can be changed in the B2 direction, the position of the center of gravity of the second weight portion 22 can be easily adjusted.

  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 first central axis C1 direction, and the second weight portion 22 is the second rotating body. 12 is provided at the front end portion in the direction of the second central axis C2 in FIG. 12, but is not limited thereto.
That is, the first weight portion 21 may be provided at an end portion on the back surface side in the first central axis C1 direction in the first rotating body 11, or in the first central axis C1 direction in the first rotating body 11. You may provide in the intermediate part located between both ends. Further, the second weight portion 22 may be provided at an end of the second rotating body 12 on the back side in the direction of the second central axis C2, or alternatively, the second weight portion 22 in the direction of the second central axis C2 in the second rotating body 12. You may provide in the intermediate part located between both ends.

  In the above-described embodiment, the first weight portion 21 is formed in a semicircular plate shape, and the second weight portion 22 is formed in a semicircular plate shape. Each shape of the part 21 and the 2nd weight part 22 is not limited above. For example, the first weight portion 21 and the second weight portion 22 may be formed in a polygonal plate shape, or may be formed in a block shape other than the plate shape.

Further, in the above-described embodiment, when the reciprocating linear motion mechanism 1 is viewed from the front, the first weight portion 21 extends at an inclination with respect to the first symmetry axis B1 at both ends in a direction perpendicular to the first symmetry axis B1. A first balance processing portion 21a is formed, and a second balance processing portion 22a extending at an angle with respect to the second symmetry axis B2 is formed at both ends of the second weight portion 22 in a direction perpendicular to the second symmetry axis B2. Although each is formed, it 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-symmetric 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-symmetric shape with respect to the second symmetry axis B2.

Moreover, the number of the 1st balance process parts 21a formed in the 1st weight part 21 is not restricted to a pair (two), One or three or more may be sufficient. When the number of the 1st balance process parts 21a is an odd number of 1 or 3 or more, it is preferable that at least 1 of the 1st balance process parts 21a is arrange | positioned on 1st symmetry axis B1. Moreover, when the number of the 1st balance process parts 21a is an even number, you may arrange | position the 1st balance process part 21a on the 1st symmetry axis B1.
Moreover, the number of the 2nd balance process parts 22a formed in the 2nd weight part 22 is not restricted to a pair (two), One or three or more may be sufficient. When the number of the second balance processing portions 22a is an odd number of one or three or more, it is preferable that at least one of the second balance processing portions 22a is disposed on the second symmetry axis B2. Moreover, when the number of the 2nd balance process parts 22a is an even number, you may arrange | position the 2nd balance process part 22a on the 2nd symmetry axis B2.
Further, the first balance processing portion 21 a may not be formed on the first weight portion 21.
Further, the second balance processing portion 22 a may not be formed on the second weight portion 22.

  In the above-described embodiment, the action part 2 connected to the punch sleeve 35 has a cylindrical shape. However, the action part 2 may have a columnar shape or a spherical shape other than the cylindrical shape. Good.

  In addition, in the range which does not deviate from the meaning of this invention, you may combine each structure (component) demonstrated by the above-mentioned embodiment, a modification, and a remark etc., addition of a structure, omission, substitution, others It can be changed. Further, the present invention is not limited by the above-described embodiments, and is limited only by the scope of the claims.

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

DESCRIPTION OF SYMBOLS 1 Reciprocating linear motion mechanism 2 Action part 3 Internal gear 4 Mechanism frame 5 External gear 10 Can molding apparatus (DI can manufacturing apparatus)
DESCRIPTION OF SYMBOLS 11 1st rotary body 12 2nd rotary body 21 1st weight part 21a 1st balance process part 22 2nd weight part 22a 2nd balance process part 30 (31-34) Die 30a (31a-34a) Through-hole 30b (31b) ) End face 35 Punch sleeve 36 Cup holder sleeve A Center axis of action part (center of action part)
B1 First symmetry axis B2 Second symmetry axis C1 First central axis C2 Second central axis S Stroke direction (predetermined direction)
V Virtual straight line W Cup-shaped body (work)

Claims (10)

A mechanism frame having an internal gear on the inner peripheral surface;
A first rotating body supported by the mechanism frame so as to be rotatable about a first central axis coaxial with the internal gear;
A second rotating body supported on the first rotating body so as to be rotatable around a second central axis spaced in parallel to the first central axis, and having an external gear meshing with the internal gear on an outer peripheral surface;
An action part provided in the second rotating body and reciprocating linearly along a predetermined direction in a first radial direction orthogonal to the first central axis;
A first weight provided on the first rotating body;
A reciprocating linear motion mechanism comprising: a second weight portion provided on the second rotating body. The reciprocating linear motion mechanism according to claim 1,
The first weight portion is provided on a portion of the first rotating body that is located on the opposite side of the second central axis from 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 that is located on the opposite side of the action portion from the second central axis along a second radial direction orthogonal to the second central axis. A reciprocating linear motion mechanism. The reciprocating linear motion mechanism according to claim 1 or 2,
Derived from the first rotating body and the second rotating body over the entire 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. The reciprocating linear motion mechanism is characterized in that a center of gravity is arranged close to a virtual straight line extending in the predetermined direction. The reciprocating linear motion mechanism according to claim 3,
A reciprocating linear motion mechanism, wherein a 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 3 or 4,
The reciprocating linear motion mechanism viewed from the first central axis direction has a distance between the virtual straight line and the center of gravity of 0.1% or less of the total stroke length of the action portion when viewed from the front. Linear motion mechanism. The reciprocating linear motion mechanism according to any one of claims 1 to 5,
The first weight with respect to a first symmetry axis passing through the first central axis and the second central axis in the first radial 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 portion is formed in a line symmetrical shape. The reciprocating linear motion mechanism according to any one of claims 1 to 6,
A second symmetry passing through the second central axis and the center of the working portion in a second radial direction orthogonal to the second central axis in a front view of the reciprocating linear motion mechanism as viewed from the second central axis direction; A reciprocating linear motion mechanism characterized in that the second weight portion is formed in a line-symmetric shape with respect to an axis. The reciprocating linear motion mechanism according to claim 6,
In the front view of the reciprocating linear motion mechanism as viewed from the first central axis direction, the first weight portion is inclined with respect to the first symmetry axis at both ends in a direction perpendicular to the first symmetry axis. A reciprocating linear motion mechanism characterized in that extending first balancing portions are formed respectively. The reciprocating linear motion mechanism according to claim 7,
In the front view of the reciprocating linear motion mechanism viewed from the second central axis direction, the second weight portion is inclined with respect to the second symmetry axis at both end portions in a direction perpendicular to the second symmetry axis. A reciprocating linear motion mechanism characterized in that a second balance machining portion is formed. A reciprocating linear motion mechanism according to any one of claims 1 to 9,
A punch sleeve connected to the action part of the reciprocating linear motion mechanism;
A die formed with a through hole through which the punch sleeve is inserted;
A cup holder sleeve which is inserted into a cup-like body disposed on an end face where the through-hole of the die is open, and which presses and fixes the bottom wall of the cup-like body against the end face. Can forming equipment.

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