Reciprocating linear motion mechanism for can body maker and can body maker

A reciprocating linear motion mechanism for a can body maker includes: a housing including an internal gear; a first rotation body; a first bearing connecting the housing and the first rotation body; a convex part protruding toward one side of an axis direction in the axis direction; a second rotation body including an external gear meshing with the internal gear; a recess recessed toward onside in the axis direction from a surface facing the other side of the second rotation body in the axis direction and into which the convex part is inserted; a second bearing connecting the convex part and the recess; and a ram shaft connection part connected to the second rotation body and moved linearly in a reciprocating manner, wherein the internal gear, the external gear, the recess, the second bearing, and the convex part overlap each other.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of priority to Japanese Patent Application No. 2020-123741, filed Jul. 20, 2020, Japanese Patent Application No. 2020-123740, filed Jul. 20, 2020, and Japanese Patent Application No. 2020-123744, filed Jul. 20, 2020, the contents of all of which are incorporated herein by reference in their entireties.

FIELD OF THE INVENTION

The present invention relates to a reciprocating linear motion mechanism for a can body maker and a can body maker.

BACKGROUND OF THE INVENTION

Conventionally, a bottomed cylindrical DI (Drawing & Ironing) can is known. The DI can is manufactured by subjecting a disc-shaped blank made of alloy such as aluminum and iron to cupping and DI processing. In the cupping, the blank is drawn to form a cup-shaped body. In the DI processing, the cup-shaped body is drawn and ironed between a punch and a die while being pressed by a cup holder.

As a can body maker that performs DI processing on the cup-shaped body, for example, one described in Japanese Unexamined Patent Application, First Publication No. 2018-54065 is known. This can body maker moves a punch linearly in a reciprocating manner in a predetermined stroke direction through a ram shaft by a reciprocating linear motion mechanism.

Specifically, the reciprocating linear motion mechanism includes a mechanism frame (housing) which includes an internal gear centered on a first center axis; a first rotation body which is supported by the mechanism frame to be rotatable around a first center axis; a second rotation body which is supported by the first rotation body to be rotatable around a second center axis separated from the first center axis in parallel and includes an external gear meshing with the internal gear, and an action portion (ram shaft connection part) which is provided in the second rotation body and moved linearly in a reciprocating manner along a predetermined direction orthogonal to the first center axis.

PATENT DOCUMENTS

SUMMARY OF THE INVENTION

In the conventional can body maker, it is required to improve the production efficiency of the can. Further, it is required to extend the life of parts of the bearing connecting the first rotation body and the second rotation body to be relatively rotatable. Further, there is room for suppressing the outer shape of the reciprocating linear motion mechanism to be small.

A first object of the present invention is to provide a reciprocating linear motion mechanism for a can body maker and a can body maker capable of improving production efficiency of a can. A second object of the present invention is to provide a reciprocating linear motion mechanism for a can body maker and a can body maker capable of extending the life of parts of a bearing connecting a first rotation body and a second rotation body.

A third object of the present invention is to provide a reciprocating linear motion mechanism for a can body maker and a can body maker capable of suppressing an outer shape of a reciprocating linear motion mechanism to be small.

In the conventional reciprocating linear motion mechanism for the can body maker, the ram shaft connection part and the external gear of the second rotation body are integrally formed with each other by a single member. Therefore, the equipment for manufacturing this member is limited and a manufacturing cost increases. Further, the member including the external gear and the ram shaft connection part needs to be assembled to or separated from the apparatus together during the assembly of the reciprocating linear motion mechanism or the maintenance and replacement (hereinafter, abbreviated as the maintenance or the like) of the bearing or the like connecting the first rotation body and the second rotation body. For this reason, the work became large-scale and took a lot of time and effort.

A fourth object of the present invention is to provide a reciprocating linear motion mechanism for a can body maker and a can body maker capable of easily manufacturing members, reducing a manufacturing cost, and having good workability such as assembly and maintenance.

In the conventional reciprocating linear motion mechanism for the can body maker, there was room for improvement in that oil was stably supplied to the bearing supporting the second rotation body to be rotatable around the second center axis with respect to the first rotation body.

A fifth object of the present invention is to provide a reciprocating linear motion mechanism for a can body maker and a can body maker capable of stably supplying oil to a bearing connecting a first rotation body and a second rotation body.

An aspect of a reciprocating linear motion mechanism for a can body maker of the present invention includes: a housing including an internal gear centered on a first center axis (for example, in a first radial direction orthogonal to the first center axis); a first rotation body located inside the housing; a first bearing connecting the housing and the first rotation body to be relatively rotatable (for example, around the first center axis); a convex part protruding toward one side of an axis direction from a surface facing one side of the first rotation body in the axis direction and centered on a second center axis parallel to the first center axis; a second rotation body including an external gear meshing with the internal gear about the second center axis and disposed on one side of the first rotation body in the axis direction; a recess which is recessed toward one side in the axis direction from a surface facing the other side of the second rotation body in the axis direction and into which the convex part is inserted; a second bearing connecting the convex part and the recess to be relatively rotatable (for example, around the second center axis); and a ram shaft connection part connected to the second rotation body and moved linearly in a reciprocating manner along a predetermined direction (for example, in a first radial direction), wherein the internal gear, the external gear, the recess, the second bearing, and the convex part overlap each other when viewed from a radial direction orthogonal to the second center axis (for example, a second radial direction).

Further, an aspect of a can body maker of the present invention includes: the reciprocating linear motion mechanism for the can body maker; a ram shaft extending in the predetermined direction and of which one end portion is connected to the ram shaft connection part; a punch disposed at the other end portion of the ram shaft; a die including a through-hole into which the punch is inserted; and a cup holder pressed against an end surface to which the through-hole of the die opens.

According to the present invention, since the axis positions of the internal gear, the external gear, the recess, the second bearing, and the convex part are the same as each other, it is possible to suppress the bulkiness of the axial dimension of the reciprocating linear motion mechanism. Thus, it is possible to suppress the outer shape of the reciprocating linear motion mechanism in the axis direction to be small and to simplify the structure.

Since the outer shape of the reciprocating linear motion mechanism is suppressed to be small, it is possible to reduce the power consumption of the drive motor or the like that drives the reciprocating linear motion mechanism. Therefore, the production efficiency of the can is increased.

Since the axis position of the second bearing connecting the convex part and the recess, that is, the bearing connecting the first rotation body and the second rotation body is the same as the axis position of the meshing portion between the internal gear and the external gear, it is possible to suppress an unbalanced load from acting on the bearing. Accordingly, the load on the bearing is reduced and the life of parts of the bearing can be extended.

In the reciprocating linear motion mechanism for the can body maker, the second bearing may overlap the internal gear and the external gear over the entire length of the axis direction when viewed from the radial direction (for example, the second radial direction).

In this case, since the internal gear and the external gear mesh with each other, it is possible to suppress a load acting on the second bearing from the radial direction from varying at each position of the second bearing in the axis direction. Since a load on the second bearing is equalized in the axis direction, the function of the second bearing is maintained satisfactorily and the frequency of maintenance or the like can be reduced.

In the reciprocating linear motion mechanism for the can body maker, a part of the second bearing and a part of the first bearing may overlap each other when viewed from the axis direction.

For example, according to the configuration of the present invention, the diameter of the first bearing is suppressed to be small compared to a case in which the first bearing does not overlap the second bearing when viewed from the axis direction and disposed on the outside in relation to the second bearing. Therefore, the outer shape of the reciprocating linear motion mechanism can be suppressed to be small.

The reciprocating linear motion mechanism for the can body maker may include a gear which is provided in the first rotation body and is centered on the first center axis.

In this case, the rotational driving force around the first center axis of the first rotation body can be output to the outside of the reciprocating linear motion mechanism through a gear. For example, a cup holder driving mechanism or the like other than the reciprocating linear motion mechanism provided in the can body maker can be stably operated while being synchronized with the operation of the reciprocating linear motion mechanism.

An aspect of a reciprocating linear motion mechanism for a can body maker of the present invention includes: a housing including an internal gear centered on a first center axis (for example, in a radial direction orthogonal to the first center axis); a first rotation body located inside the housing and is connected to the housing to be relatively rotatable (for example, around the first center axis); a second rotation body including an external gear meshing with the internal gear about a second center axis parallel to the first center axis, is disposed on one side of the first rotation body in the axis direction, and is connected to the first rotation body to be relatively rotatable (for example, around the second center axis); and a ram shaft connection part connected to the second rotation body and moved linearly in a reciprocating manner along a predetermined direction (for example, in the radial direction), wherein the second rotation body includes the external gear and a connection part which is provided separately from the external gear, is located on one side of the external gear in the axis direction, and connects the external gear and the ram shaft connection part.

Further, an aspect of a can body maker of the present invention includes: the reciprocating linear motion mechanism for the can body maker; a ram shaft extending in the predetermined direction and of which one end portion is connected to the ram shaft connection part; a punch disposed at the other end portion of the ram shaft; a die including a through-hole into which the punch is inserted; and a cup holder pressed against an end surface to which the through-hole of the die opens.

According to the present invention, since the connection part and the external gear of the second rotation body are separated from each other, at least the external gear can be manufactured alone. The external gear can be easily manufactured without requiring particular equipment or the like and the manufacturing cost can be reduced. Further, the external gear and the connection part can be separately assembled or separated during the assembly of the reciprocating linear motion mechanism or the maintenance of parts of the bearing connecting the first rotation body, the second rotation body, and the like. Specifically, an operator can assemble the external gear and the connection part in this order from one side of the reciprocating linear motion mechanism (device) in the axis direction or separate the connection part and the external gear in this order from the device. Accordingly, each operation is simplified and the operation time is shortened. Thus, according to the present invention, the members can be easily manufactured, the manufacturing cost can be reduced, and the workability such as assembly and maintenance is good.

Since workability such as maintenance is good, it is possible to shorten the time for stopping the operation of the can body maker for maintenance or the like. That is, the operation time of the can body maker can be increased and the production efficiency of the can is improved.

When the operator separates the connection part from the external gear, it is easy to access, for example, the bearing disposed inside the external gear and connecting the first rotation body and the second rotation body from the outside of apparatus. Since the maintenance of the bearing is good, the function of the bearing can be maintained satisfactorily and the life of parts can be extended.

The reciprocating linear motion mechanism for the can body maker may further include a bearing connecting the first rotation body and the second rotation body to be relatively rotatable (for example, around the second center axis), the external gear may have a tubular shape extending in the axis direction, the connection part may block an opening on one side of the external gear in the axis direction, the first rotation body may include a convex part protruding toward one side in the axis direction from a surface facing one side of the first rotation body in the axis direction and inserted into the external gear, and the bearing may be interposed between an inner circumferential surface of the external gear and an outer circumferential surface of the convex part.

In this case, when the operator separates the connection part from one side of the axis direction, it is possible to easily access the bearing inside the external gear. That is, it is possible to access the bearing even when the external gear is not separated from the apparatus. If necessary, it is easy to separate the external gear or the bearing from the apparatus. Therefore, workability such as maintenance is improved. Further, the attachment structure of the bearing can be simplified and the reciprocating linear motion mechanism can have a compact configuration.

In the reciprocating linear motion mechanism for the can body maker, the connection part may include a first fitting hole which penetrates the connection part in the axis direction and a bolt insertion hole which penetrates the connection part in the axis direction, the external gear may include a second fitting hole which opens to a surface facing one side of the external gear in the axis direction and a female screw hole which opens to a surface facing one side of the external gear in the axis direction, and the second rotation body may include a pin member that is fitted to the first fitting hole and the second fitting hole and a bolt member that is inserted into the bolt insertion hole and is screwed into the female screw hole.

In this case, the connection part and the external gear can be fixed by the bolt member while the connection part and the external gear are positioned around the second center axis by the pin member. Therefore, the positional accuracy of the external gear and the ram shaft connection part connected to the connection part is stably ensured. Further, a force generated in the circumferential direction around the second center axis between the connection part and the external gear during the operation or the like of the reciprocating linear motion mechanism can be received by the pin member that is more easily to ensure rigidity than the bolt member. Accordingly, damage or the like the bolt member is suppressed. The relative movement of the connection part and the external gear in the circumferential direction around the second center axis is regulated by the pin member and the relative movement of the connection part and the external gear in the axis direction is regulated by the bolt member.

In the reciprocating linear motion mechanism for the can body maker, the external gear may have a tubular shape extending in the axis direction, and the connection part may include a fitting cylinder part protruding from a surface facing the other side of the connection part in the axis direction and fitted to an inner circumferential surface or an outer circumferential surface of the external gear.

In this case, since the external gear and the fitting cylinder part are fitted to each other, the external gear and the connection part are positioned in the radial direction orthogonal to the second center axis. Further, a force generated in the radial direction orthogonal to the second center axis between the connection part and the external gear during the operation or the like of the reciprocating linear motion mechanism can be received by the fitting cylinder part that is more easily to ensure rigidity than the bolt member. Accordingly, damage or the like of the bolt member is suppressed. The relative movement of the connection part and the external gear in the radial direction orthogonal to the second center axis is regulated by the fitting cylinder part.

An aspect of a reciprocating linear motion mechanism for a can body maker of the present invention includes: a housing including an internal gear centered on a first center axis (for example, in a first radial direction orthogonal to the first center axis); a first rotation body located inside the housing and is connected to the housing to be relatively rotatable (for example, around the first center axis); a second rotation body including an external gear meshing with the internal gear about a second center axis parallel to the first center axis; a bearing connecting the first rotation body and the second rotation body to be relatively rotatable (for example, around the second center axis); a ram shaft connection part connected to the second rotation body and moved linearly in a reciprocating manner along a predetermined direction (for example, in the first radial direction); and an oil supply path penetrating the internal gear and the external gear and supplies oil to the bearing, wherein the oil supply path includes an internal gear flow path extending through the internal gear and opens to at least internal teeth of the internal gear and an external gear flow path extending through the external gear and includes a portion opening to external teeth of the external gear and a portion opening to the bearing, and wherein when the external gear is disposed at a predetermined position around the first center axis with respect to the internal gear, the internal gear flow path and the external gear flow path communicate with each other through a meshing portion between the internal teeth and the external teeth.

Further, an aspect of the can body maker of the present invention includes: the reciprocating linear motion mechanism for the can body maker; a ram shaft extending in the predetermined direction and of which one end portion is connected to the ram shaft connection part; a punch disposed at the other end portion of the ram shaft; a die including a through-hole into which the punch is inserted; and a cup holder pressed against an end surface to which the through-hole of the die opens.

In the present invention, when the external gear revolves around the first center axis along the inner circumferential portion of the internal gear while turning around the second center axis to be disposed at a predetermined position around the first center axis, the internal gear flow path and the external gear flow path are connected to each other through a meshing portion between the internal teeth and the external teeth. Accordingly, oil inside the internal gear flow path flows into the external gear flow path. The oil flowing into the external gear flow path is discharged from the inside of the external gear flow path toward the bearing. According to the present invention, oil can be stably supplied to the bearing connecting the first rotation body and the second rotation body even during the operation of the can body maker. The bearing is stably cooled and lubricated by the oil and the performance of the bearing is maintained satisfactorily.

Since oil can be supplied to the bearing during the operation of the can body maker, the function of the bearing is maintained satisfactorily and the frequency of stopping the operation of the can body maker for the maintenance or the like of the bearing can be reduced. That is, the operation time of the can body maker can be increased and the production efficiency of the can is improved.

Since oil is stably supplied to the bearing connecting the first rotation body and the second rotation body, the life of parts of the bearing can be extended.

In the reciprocating linear motion mechanism for the can body maker, the first rotation body may include a convex part protruding toward one side in the axis direction from a surface facing one side of the first rotation body in the axis direction and centered on the second center axis, the second rotation body may include a recess which is recessed toward one side in the axis direction from a surface facing the other side of the second rotation body in the axis direction and into which the convex part is inserted, and the bearing may connect the convex part and the recess to be relatively rotatable (for example, around the second center axis).

In this case, the first rotation body and the second rotation body are connected to each other by the convex part, the recess, and the bearing interposed therebetween. Therefore, the structure of the reciprocating linear motion mechanism can be simplified.

In the reciprocating linear motion mechanism for the can body maker, the external gear flow path may penetrate the external gear in the radial direction (for example, the second radial direction) orthogonal to the second center axis.

In this case, the external gear flow path can be formed in, for example, a simple shape such as a linear hole, the friction loss (resistance) of the oil flowing through the external gear flow path can be reduced, and oil can be stably supplied to the bearing.

According to the reciprocating linear motion mechanism for the can body maker and the can body maker of an aspect of the present invention, the production efficiency of the can be improved. Further, the life of parts of the bearing connecting the first rotation body and the second rotation body to be relatively rotatable can be extended.

According to the reciprocating linear motion mechanism for the can body maker and the can body maker of an aspect of the present invention, the outer shape of the reciprocating linear motion mechanism can be suppressed to be small.

According to the reciprocating linear motion mechanism for the can body maker and the can body maker of an aspect of the present invention, members are easily manufactured, a manufacturing cost can be reduced, and workability such as assembly and maintenance is good.

According to the reciprocating linear motion mechanism for the can body maker and the can body maker of an aspect of the present invention, oil can be stably supplied to the bearing connecting the first rotation body and the second rotation body.

DETAILED DESCRIPTION OF THE INVENTION

A can body maker1and a reciprocating linear motion mechanism10for the can body maker1(hereinafter, simply referred to as the reciprocating linear motion mechanism10in some cases) of an embodiment of the present invention will be described with reference to the drawings.

As shown inFIG.1, the can body maker1of the embodiment is a DI can manufacturing apparatus which manufactures a DI can100by performing DI processing on a cup-shaped body W which is a workpiece.

First, the DI can100will be described.

The DI can100is a bottomed cylinder. The DI can100is used for a can body such as a two-piece can or a bottle can filled and sealed with the contents of a beverage or the like. In the case of the two-piece can, the can body includes the DI can100and a disc-shaped can lid wrapped around an opening end of the DI can100. In the case of the bottle can, the can body includes a bottle can body obtained by performing necking, screwing, and the like on the DI can100and a cap screwed to an opening end of the bottle can body.

The DI can100is formed into a bottomed cylindrical shape by subjecting a disk-shaped blank punched from a plate material such as an aluminum alloy to a cupping step (drawing step) and a DI step (drawing and ironing step). Specifically, in the case of the two-piece can, for example, the DI can100is manufactured through a plate material punching step, a cupping step, a DI step, a trimming step, a printing step, an inner surface coating step, a necking step, and a flanging step in this order.

In the process of manufacturing the DI can100, the blank is subjected to drawing (cupping) by a cupping press and is formed into the cup-shaped body W. That is, the cup-shaped body W is an intermediate produced in the process of transitioning from the blank to the DI can100in the cupping step. The cup-shaped body W has a bottomed cylindrical shape having a smaller circumferential wall height (a length in the can axis direction) and a larger diameter than the DI can100.

Next, the can body maker1will be described.

The can body maker1is used for the DI step. The can body maker1performs DI processing, that is, drawing (redrawing) and ironing on the cup-shaped body W to form the DI can100having a larger circumferential wall height and a smaller diameter than the cup-shaped body W. Further, the can body maker1forms the can bottom of the DI can100into a dome shape in the above DI step. That is, in the embodiment, the can formed by the can body maker1is the DI can100.

The can body maker1includes the reciprocating linear motion mechanism10, a ram shaft3which extends in a predetermined direction (hereinafter, referred to as a stroke direction S in some cases) in which a ram shaft connection part35to be described later of the reciprocating linear motion mechanism10is moved linearly in a reciprocating manner and of which one end portion is connected to the ram shaft connection part35, a punch2which is disposed at the other end portion of the ram shaft3, a ram bearing5which supports the ram shaft3to be movable in a reciprocating manner along the axis direction of the center axis O of the ram shaft3, a die8which has a through-hole7into which the punch2is inserted, a cup holder6which is pressed against an end surface9to which the through-hole7of the die8opens, and a dormer11which sandwiches the can bottom of the DI can100with the punch2and is formed in a dome shape.

The center axes O of the ram shaft3, the punch2, the ram bearing5, the through-hole7of the die8, the cup holder6, and the dormer11are arranged coaxially with each other. In the embodiment, the center axis O which is a common axis of these members extends in the horizontal direction.

Further, the can body maker1includes a cup feeder (not shown) which supplies the cup-shaped body W onto the end surface9of the die8, a receiving seat (not shown) which holds the cup-shaped body W on the end surface9, a can conveying mechanism (not shown) which conveys the formed DI can100to the outside of the apparatus, an air discharge mechanism (not shown) which discharges air from an air discharge hole opening to at least any one of the front end surface and the outer circumferential surface of the punch2and separates the DI can100from the punch2, a cup holder driving mechanism (not shown) which is driven in synchronization with the reciprocating linear motion mechanism10and moves the cup holder6in a reciprocating manner in the axis direction of the center axis O with a stroke length different from that of the ram shaft connection part35of the reciprocating linear motion mechanism10, and a drive source (not shown) such as a drive motor.

The reciprocating linear motion mechanism10converts the rotational driving force around the first center axis C1input from the drive source into the reciprocating linear motion in the stroke direction S along the center axis O and outputs the result to the ram shaft connection part35. A detailed configuration of the reciprocating linear motion mechanism10will be described separately below.

The ram shaft3has an axial shape extending along the center axis O. The ram shaft3is slidably supported by the pair of ram bearings5disposed to be separated from each other in the axis direction of the center axis O.

The punch2has a cylindrical shape or a columnar shape extending along the center axis O.

The pair of ram bearings5is disposed between the reciprocating linear motion mechanism10and the die8in the axis direction of the center axis O. Of the pair of ram bearings5, one ram bearing5disposed at a position close to the die8is a front bearing SF and the other ram bearing5disposed at a position close to the reciprocating linear motion mechanism10is a rear bearing5R. The front bearing SF and the rear bearing5R have a fluid bearing structure called, for example, a dynamic bearing or a hydrostatic bearing.

A plurality of the dies8are provided side by side in the axis direction of the center axis O. Each of the plurality of dies8includes a through-hole7which penetrates the die8in the axis direction of the center axis O and has a circular cross-section. The plurality of dies8include one redrawing die8A and a plurality of ironing dies (ironing dies)8B which are located on the side of the dormer11in relation to the redrawing die8A. Although particularly not shown, each pilot ring is disposed on the side of the dormer11in each ironing die8B. Since the pilot ring is provided, it is possible to suppress the punch2from contacting each ironing die8B due to the impact generated when the DI can100is separated from (passed through) each ironing die8B in forming.

Further, a coolant liquid for lubricating and cooling is supplied to the redrawing die8A and each ironing die8B in forming.

The cup holder6includes a cylindrical cup holder sleeve6awhich extends in the axis direction of the center axis O. The cup holder sleeve6ais concentrically disposed on the outside of the punch2in the radial direction and is movable with respect to the punch2in the axis direction of the center axis O. The cup holder sleeve6ais inserted into the cup-shaped body W disposed on the end surface9of the redrawing die8A and holds the bottom wall of the cup-shaped body W to be pressed against the end surface9. That is, the cup holder6supports the bottom wall of the cup-shaped body W to be pressed against the end surface9facing the reciprocating linear motion mechanism10in the die8.

Although particularly not shown, the cup holder driving mechanism converts the rotational driving force transmitted from the drive source through the reciprocating linear motion mechanism10into the reciprocating motion in the axis direction of the center axis O and moves the cup holder6linearly in a reciprocating manner in the axis direction of the center axis O.

The dormer11is a mold for molding the can bottom of the DI can100. The dormer11has a substantially cylindrical shape extending in the axis direction of the center axis O. When the punch2is disposed at the forward movement end position in the stroke direction S, the dormer11faces the punch2in the axis direction of the center axis O.

The air discharge mechanism includes an air discharge hole (not shown) which opens to the outer surface of the punch2, an air supply path28to be described later (seeFIG.4) of the reciprocating linear motion mechanism10, an air communication path (not shown) which allows the air discharge hole and the air supply path28to communicate with each other, and an air supply source (not shown).

Although particularly not shown, the air communication path includes a ram shaft flow path extending through the ram shaft3in the axis direction of the center axis O. The air supply source is, for example, an air compressor or the like and supplies air (compressed air) to the air supply path28.

The can body maker1performs DI processing on the cup-shaped body W as below.

First, the cup-shaped body W which is a workpiece is disposed between the punch2and the redrawing die8A in a posture in which the cup shaft (can shaft) is extended in the horizontal direction and the opening thereof is directed toward the punch2. The bottom wall of the cup-shaped body W faces the end surface9of the redrawing die8A.

The cup holder6and the punch2are moved forward in the axis direction of the center axis O with respect to the cup-shaped body W. That is, the cup holder6and the punch2are moved from the reciprocating linear motion mechanism10toward the side of the die8, that is, the front side in the stroke direction S. Then, the cup-shaped body W is subjected to redrawing in such a manner that the punch2presses the cup-shaped body W into the through-hole7of the redrawing die8A while the cup holder6performs an operation of cup-pressing the bottom wall of the cup-shaped body W against the end surface9of the redrawing die8A.

Due to the redrawing, the cup-shaped body W is formed to have a small diameter and a long length in the cup axis direction. Further, ironing is performed while this cup-shaped body W is pressed by the punch2to sequentially pass through the through-holes7of the plurality of ironing dies8B. That is, the circumferential wall of the cup-shaped body W is squeezed and stretched to increase the height of the circumferential wall and decrease the thickness of the circumferential wall so that the shape of the bottomed cylindrical DI can100is formed. The strength of the DI can100is increased in such a manner that cold work hardening is performed by squeezing the circumferential wall.

The ironed DI can100is pressed out from the through-hole7of the die8toward the dormer11by the punch2. Then, the bottom portion (a portion corresponding to the can bottom) of the DI can100is pressed between the punch2and the dormer11so that the bottom portion of the DI can100is formed in a dome shape.

Next, the reciprocating linear motion mechanism10will be described.

As shown inFIGS.2to4, the reciprocating linear motion mechanism10includes a housing15having an internal gear16, a first rotation body21having a convex part25, a first bearing31, a second rotation body22having a recess27and an external gear23meshing with the internal gear16, a second bearing (bearing)32, an air joint member40, a ram shaft connection part35, a first weight part51, a second weight part52, a shaft body26, the air supply path28, a first oil supply path36, a second oil supply path (oil supply path)37, and a gear (not shown). That is, the reciprocating linear motion mechanism10includes the convex part25and the recess27.

The housing15, the internal gear16, a portion other than the convex part25of the first rotation body21, the first bearing31, the shaft body26, and the gear are centered on the first center axis C1, that is, these members are coaxially disposed with the first center axis C1as a common axis. The convex part25, the second rotation body22, the external gear23, the recess27, the second bearing32, and the air joint member40are centered on the second center axis C2, that is, these members are coaxially disposed with the second center axis C2as a common axis.

The first center axis C1and the second center axis C2are disposed to be parallel and away from each other. In the embodiment, the first center axis C1and the second center axis C2extend in the horizontal direction.

In the description below, the extension direction of the first center axis C1and the extension direction of the second center axis C2are simply referred to as the axis direction. In the axis direction, the first rotation body21and the ram shaft connection part35are disposed at different positions. In the axis direction, a direction from the first rotation body21toward the ram shaft connection part35is referred to as one side in the axis direction and a direction from the ram shaft connection part35toward the first rotation body21is referred to as the other side in the axis direction. Additionally, one side in the axis direction may be referred to as the front side and the other side in the axis direction may be referred to as the rear side.

A direction orthogonal to the first center axis C1is referred to as a first radial direction (radial direction). In the first radial direction, a direction closer to the first center axis C1is referred to as the inside of the first radial direction and a direction away from the first center axis C1is referred to as the outside of the first radial direction.

A direction around the first center axis C1is referred to as a first circumferential direction. In the first circumferential direction, a direction in which the first rotation body21is rotated with respect to the housing15at the time of operating the can body maker1is referred to as a first rotation direction T1.

A direction orthogonal to the second center axis C2is referred to as a second radial direction (radial direction). In the second radial direction, a direction closer to the second center axis C2is referred to the inside of the second radial direction and a direction away from the second center axis C2is referred to as the outside of the second radial direction.

A direction around the second center axis C2is referred to as a second circumferential direction. In the second circumferential direction, a direction in which the second rotation body22is rotated with respect to the first rotation body21at the time of operating the can body maker1is referred to as a second rotation direction T2.

As shown inFIG.4, the housing15has a tubular shape centered on the first center axis C1. The housing15includes an internal gear16and a housing body17.

The internal gear16has an annular shape centered on the first center axis C1. The internal gear16has a cylindrical shape and extends in the axis direction. The internal gear16is disposed at one end portion of the housing15in the axis direction. The internal gear16is disposed at one opening of the housing15in the axis direction.

The internal gear16includes a plurality of internal teeth16awhich are provided on the inner circumferential portion of the internal gear16to be arranged in the first circumferential direction. The internal teeth16aare disposed on the inner circumferential portion of the internal gear16over the entire length of the axis direction. In the embodiment, the internal teeth16aare exposed to the outside of the reciprocating linear motion mechanism10through one opening of the housing15in the axis direction.

The housing body17has a cylindrical shape centered on the first center axis C1and extends in the axis direction. The first rotation body21and the first bearing31are disposed on the inside of the housing body17, that is, the inside of the first radial direction. The internal gear16is fixed to one end portion of the housing body17in the axis direction.

The housing body17includes a first outer race support part17g. The first outer race support part17gprotrudes inward in the first radial direction from the inner circumferential surface of the housing body17and extends in the first circumferential direction. The first outer race support part17ghas a disc shape centered on the first center axis C1. A pair of plate surfaces of the first outer race support part17gfaces the axis direction.

The first rotation body21is located inside the housing15in the first radial direction. The first rotation body21is connected to the housing15to be relatively rotatable around the first center axis C1.

As shown inFIGS.4and5, the first rotation body21has a substantially columnar shape centered on the first center axis C1. The first rotation body21is disposed inside the housing body17. That is, the first rotation body21is accommodated in the housing15.

The first rotation body21includes a hole portion21a, a flange portion21b, and the convex part25.

The hole portion21ais recessed from a surface21efacing the other side of the first rotation body21in the axis direction toward one side in the axis direction and extends in the axis direction. The hole portion21ahas a circular hole shape centered on the first center axis C1. Specifically, the hole portion21ais recessed from a portion other than the outer circumferential portion in a surface21efacing the other side of the first rotation body21in the axis direction toward one side in the axis direction. That is, the hole portion21aopens to the other side in the axis direction.

The flange portion21bis disposed at one end portion of the outer circumferential portion of the first rotation body21in the axis direction. The flange portion21bhas a disc shape centered on the first center axis C1. The flange portion21bprotrudes outward in the first radial direction from the outer circumferential surface of the first rotation body21and extends in the first circumferential direction. The pair of plate surfaces of the flange portion21bfaces the axis direction. Of the pair of plate surfaces of the flange portion21b, the plate surface facing the other side in the axis direction contacts the inner race31aof the first bearing31from one side in the axis direction.

The convex part25will be described below.

The first bearing31is, for example, a taper roller bearing or the like. The first bearing31can support a load (radial load) from the first radial direction and a load (axial load) from the axis direction. The first bearing31connects the housing15and the first rotation body21to be relatively rotatable around the first center axis C1.

The first bearing31includes an inner race31a, a spacer31d, an outer race31b, and a rolling element31c.

The inner race31ahas a tubular shape centered on the first center axis C1. The inner race31ais fitted to the outer circumferential surface of the first rotation body21. A plurality of the inner races31aare provided side by side in the axis direction. In the embodiment, the first bearing31includes a pair of the inner races31awhich are arranged with a gap therebetween in the axis direction. The spacer31dis disposed between the pair of inner races31a. The spacer31dhas a tubular shape centered on the first center axis C1. The spacer31dis fitted to the outer circumferential surface of the first rotation body21.

Of the pair of inner races31a, the one inner race31alocated on one side in the axis direction is disposed between the flange portion21band the spacer31din the axis direction. The flange portion21bcontacts the end surface facing one side in the axis direction of one inner race31a. The spacer31dcontacts the end surface facing the other side in the axis direction of one inner race31a.

The spacer31dcontacts the end surface facing one side in the axis direction.

The outer race31bhas a tubular shape centered on the first center axis C1. The outer race31bis located on the outside of the first radial direction in relation to the inner race31a. The outer race31bis fitted to the inner circumferential surface of the housing body17. A plurality of the outer races31bare provided side by side in the axis direction. In the embodiment, the first bearing31includes a pair of the outer races31bwhich are arranged with a gap therebetween in the axis direction. The first outer race support part17gis disposed between the pair of outer races31b.

Of the pair of outer races31b, the first outer race support part17gcontacts the end surface facing the other side in the axis direction of the one outer race31blocated at one side in the axis direction.

The first outer race support part17gcontacts the end surface facing one side in the axis direction of the other outer race31blocated on the other side in the axis direction in the pair of outer races31b.

The rolling element31cis a columnar roller or the like. The rolling element31cis disposed between the inner race31aand the outer race31bin the first radial direction. A plurality of the rolling elements31care provided side by side in the first circumferential direction. A plurality of rows of the rolling elements31carranged in the first circumferential direction (hereinafter, simply referred to as the rows of the rolling elements31c) are provided side by side in the axis direction. In the embodiment, the first bearing31includes a row of a pair of the rolling elements31cdisposed with a gap therebetween in the axis direction.

Of the rows of the pair of rolling elements31c, the row of the one rolling elements31clocated on one side in the axis direction is rotatably held between one inner race31aand one outer race31b.

Of the rows of the pair of rolling elements31c, the row of the other rolling elements31clocated on the other side in the axis direction is rotatably held between the other inner race31aand the other outer race31b.

The convex part25protrudes from a surface21dfacing one side of the first rotation body21in the axis direction toward one side in the axis direction and extends in the axis direction. The convex part25has a columnar shape centered on the second center axis C2. Specifically, the convex part25protrudes from the outer portion of the first radial direction in the surface21dfacing one side of the first rotation body21in the axis direction toward one side in the axis direction.

The convex part25includes an outer circumferential step portion25a.

The outer circumferential step portion25aconstitutes a part of the outer circumferential portion of the convex part25. In the example shown in the drawings, the outer circumferential step portion25ais disposed at the other end portion of the outer circumferential portion of the convex part25in the axis direction. The outer circumferential step portion25ahas an annular surface shape centered on the second center axis C2and faces one side in the axis direction.

The second rotation body22is disposed on one side of the first rotation body21in the axis direction. The second rotation body22is connected to the first rotation body21to be relatively rotatable around the second center axis C2.

As shown inFIGS.4,6, and7, the second rotation body22has a substantially eclipsed cylinder shape centered on the second center axis C2. The second rotation body22includes an external gear23, a top wall portion (connection part)22b, a pin member34, a bolt member24, a fitting insertion hole22c, and a recess27.

The external gear23has a tubular shape centered on the second center axis C2and extends in the axis direction. The external gear23has a substantially cylindrical shape. As shown inFIG.4, the convex part25is inserted into the external gear23. A part of a surface22efacing the other side of the external gear23in the axis direction faces a part of the surface21dfacing one side of the first rotation body21in the axis direction with a gap therebetween in the axis direction. The other part of the surface22efacing the other side of the external gear23in the axis direction faces a part of the first bearing31with a gap therebetween in the axis direction.

The external gear23includes a plurality of external teeth23awhich are provided on the outer circumferential portion of the external gear23to be arranged in the second circumferential direction. The external teeth23aare disposed at a portion other than one end portion of the outer circumferential portion of the external gear23in the axis direction. In the embodiment, the external teeth23apass through one opening of the housing15in the axis direction and are exposed to the outside of the reciprocating linear motion mechanism10.

At least one or more of the plurality of external teeth23aand at least one or more of the plurality of internal teeth16amesh with each other. The pitch circle diameter of the external teeth23aof the external gear23is a half of the pitch circle diameter of the internal teeth16aof the internal gear16.

As shown inFIG.7, the external gear23includes a second outer race support part23b, a second fitting hole23c, and a female screw hole23d.

The second outer race support part23bprotrudes inward in the second radial direction from the inner circumferential surface of the external gear23and extends in the second circumferential direction. The second outer race support part23bhas a cylindrical shape centered on the second center axis C2. A pair of end surfaces of the second outer race support part23bfaces the axis direction.

The second fitting hole23copens to a surface23efacing one side of the external gear23in the axis direction. The second fitting hole23chas a circular hole shape and extends in the axis direction. In the embodiment, the second fitting hole23cis a retaining hole of which one end portion in the axis direction opens to the surface23eand the other end portion in the axis direction is closed. In the embodiment, one second fitting hole23cis provided.

The female screw hole23dopens to the surface23eopening to one side of the external gear23in the axis direction. The female screw hole23dhas a circular hole shape and extends in the axis direction. The female screw hole23dincludes a female screw portion on the inner circumferential surface. In the embodiment, the female screw hole23dis a retaining hole of which one end portion in the axis direction opens to the surface23eand the other end portion in the axis direction is closed. A plurality of the female screw holes23dare provided at intervals in the second circumferential direction. At least one of the plurality of female screw holes23dis arranged side by side with the second fitting hole23cin the second circumferential direction. Specifically, in the embodiment, the plurality of female screw holes23dand the plurality of second fitting holes23care arranged in the second circumferential direction on a virtual circle (not shown) centered on the second center axis C2when viewed from the axis direction (seeFIG.3).

InFIG.2, the external gear23rotates (turns) in the second rotation direction T2while rotating (revolving) in the first rotation direction T1along the inner circumferential portion of the internal gear16at the time of operating the can body maker1. In the embodiment, when the reciprocating linear motion mechanism10is viewed from one side in the axis direction, that is, the reciprocating linear motion mechanism10is viewed from the front side, the first rotation direction T1is a counterclockwise direction about the first center axis C1and the second rotation direction T2is a clockwise direction about the second center axis C2. However, the present invention is not limited thereto. When the reciprocating linear motion mechanism10is viewed from one side in the axis direction, the first rotation direction T1may be a clockwise direction about the first center axis C1and the second rotation direction T2may be a counterclockwise direction about the second center axis C2.

As shown inFIGS.4and7, the top wall portion22bis disposed on one side of the external gear23in the axis direction. The top wall portion22bis separated from the external gear23and is located on one side of the external gear23in the axis direction. That is, the top wall portion22band the external gear23are manufactured as different members. In the embodiment, the top wall portion22bhas a plate shape that spreads in a direction perpendicular to the second center axis C2. The top wall portion22bis connected to one end portion of the external gear23in the axis direction and the other end portion of the ram shaft connection part35in the axis direction. That is, the top wall portion22bconnects the external gear23and the ram shaft connection part35. The top wall portion22bblocks one opening of the external gear23in the axis direction. The top wall portion22bmay be paraphrased as a closing wall portion22bor a front wall portion22b. A surface facing the other side of the top wall portion22bin the axis direction contacts the surface23efacing one side of the external gear23in the axis direction.

As shown inFIG.7, the top wall portion22bincludes a first fitting hole22f, a bolt insertion hole22g, and a fitting cylinder part22d.

The first fitting hole22fpenetrates the top wall portion22bin the axis direction. The first fitting hole22fhas a circular hole shape and extends in the axis direction. The first fitting hole22fis a through-hole that opens to a surface facing one side of the top wall portion22bin the axis direction and a surface facing the other side in the axis direction. In the example shown in the drawings, the inner diameter of the first fitting hole22fis the same as the inner diameter of the second fitting hole23c. In the embodiment, one first fitting hole22fis provided.

The bolt insertion hole22gpenetrates the top wall portion22bin the axis direction. The bolt insertion hole22ghas a multi-stage circular hole shape and extends in the axis direction. The bolt insertion hole22gis a through-hole opening to a surface facing one side of the top wall portion22bin the axis direction and a surface facing the other side in the axis direction. A plurality of the bolt insertion holes22gare provided at intervals in the second circumferential direction. At least one of the plurality of bolt insertion holes22gis provided side by side with the first fitting hole22fin the second circumferential direction. Specifically, in the embodiment, the plurality of bolt insertion holes22gand the plurality of first fitting holes22fare arranged in the second circumferential direction on a virtual circle (not shown) centered on the second center axis C2when viewed from the axis direction (seeFIG.3).

As shown inFIG.7, the bolt insertion hole22gincludes a head portion arrangement portion22h, a shaft portion arrangement portion22i, and a step portion22j.

The head portion arrangement portion22his located at a portion on one side of the bolt insertion hole22gin the axis direction. The head portion arrangement portion22hopens to one surface of the top wall portion22bin the axis direction and extends in the axis direction. The head portion arrangement portion22hhas a circular hole shape.

The shaft portion arrangement portion22iis located at a portion on the other side of the bolt insertion hole22gin the axis direction. The shaft portion arrangement portion22iopens to the other surface of the top wall portion22bin the axis direction and extends in the axis direction. The shaft portion arrangement portion22ihas a circular hole shape. The inner diameter of the shaft portion arrangement portion22iis smaller than the inner diameter of the head portion arrangement portion22h. The shaft portion arrangement portion22iand the head portion arrangement portion22hcommunicate with each other.

The step portion22jis disposed between the head portion arrangement portion22hand the shaft portion arrangement portion22i. The step portion22jhas an annular surface shape spreading in a direction perpendicular to the second center axis C2and faces one side in the axis direction.

The fitting cylinder part22dprotrudes toward the other side in the axis direction from the surface facing the other side of the top wall portion22bin the axis direction. The fitting cylinder part22dhas a tubular shape centered on the second center axis C2. The fitting cylinder part22dis inserted into the external gear23. The fitting cylinder part22dis fitted to the inner circumferential surface of the external gear23. That is, the fitting cylinder part22dis fitted to the hole portion27.

The pin member34has a columnar shape extending in the axis direction. The pin member34is inserted through the first fitting hole22fand the second fitting hole23c. The pin member34is fitted to the inner circumferential surfaces of the first fitting hole22fand the second fitting hole23c. That is, the pin member34is fitted to the first fitting hole22fand the second fitting hole23c. In the embodiment, one pin member34is provided.

The bolt member24has a multi-stage columnar shape extending in the axis direction. The bolt member24is inserted into the bolt insertion hole22gand is screwed into the female screw hole23d. The top wall portion22band the external gear23are fixed to each other by the bolt member24.

The bolt member24includes a shaft portion24ahaving a male screw portion formed on the outer circumferential surface and a head portion24bhaving an outer diameter larger than that of the shaft portion24a.

The male screw portion of the shaft portion24ais screwed to the female screw portion of the female screw hole23d. One end portion of the shaft portion24ain the axis direction is disposed inside the shaft portion arrangement portion22i.

The head portion24bis disposed inside the head portion arrangement portion22h. An end surface facing the other side of the head portion24bin the axis direction contacts the step portion22j.

The outer diameter of one end portion of the shaft portion24ain the axis direction is smaller than the inner diameter of the shaft portion arrangement portion22i. The outer diameter of the head portion24bis smaller than the inner diameter of the head portion arrangement portion22h. Therefore, a gap is provided between the outer circumferential surface of the bolt member24and the inner circumferential surface of the bolt insertion hole22g.

As shown inFIGS.2and3, a plurality of the bolt members24are provided. The plurality of bolt members24are arranged at intervals in the second circumferential direction. At least one of the plurality of bolt members24is provided side by side with the pin member34in the second circumferential direction. Specifically, in the embodiment, as shown inFIG.3, the plurality of bolt members24and the plurality of pin members34are arranged in the second circumferential direction on a virtual circle (not shown) centered on the second center axis C2when viewed from the axis direction. In the example shown in the drawings, at least one of the plurality of bolt members24is disposed inside the tubular ram shaft connection part35when viewed from the axis direction.

As shown inFIG.4, the fitting insertion hole22cpenetrates the top wall portion22bin the axis direction. The fitting insertion hole22chas a circular hole shape centered on the second center axis C2.

The recess27is recessed from the surface22efacing the other side of the second rotation body22in the axis direction toward one side in the axis direction and extends in the axis direction. The recess27has a circular hole shape centered on the second center axis C2. Specifically, the recess27is recessed from an inner portion of the second radial direction in the surface22efacing the other side of the external gear23in the axis direction toward one side in the axis direction. That is, the recess27opens to the other side in the axis direction. One end portion of the recess27in the axis direction is blocked by the top wall portion22b. The convex part25is inserted into the recess27.

The second bearing32is, for example, a taper roller bearing or the like. The second bearing32can support a load (radial load) from the second radial direction and a load (axial load) from the axis direction. The second bearing32is interposed between the inner circumferential surface of the external gear23, that is, the inner circumferential surface of the recess27and the outer circumferential surface of the convex part25. The second bearing32connects the convex part25and the recess27to be relatively rotatable around the second center axis C2. That is, the second bearing32connects the first rotation body21and the second rotation body22to be relatively rotatable around the second center axis C2.

The second bearing32includes an inner race32a, a spacer32d, an outer race32b, and a rolling element32c.

The inner race32ahas a tubular shape centered on the second center axis C2. The inner race32ais fitted to the outer circumferential surface of the convex part25. A plurality of the inner races32aare provided side by side in the axis direction. In the embodiment, the second bearing32includes a pair of the inner races32adisposed with a gap therebetween in the axis direction. The spacer32dis disposed between the pair of inner races32a. The spacer32dhas a tubular shape centered on the second center axis C2. The spacer32dis fitted to the outer circumferential surface of the convex part25.

Of the pair of inner races32a, the one inner race32alocated on one side of the axis direction is disposed between the spacer32dand an inner ring retainer41to be described later of the air joint member40in the axis direction. The inner ring retainer41contacts the end surface facing one side of one inner race32ain the axis direction. The spacer32dcontacts the end surface facing the other side of one inner race32ain the axis direction. That is, one inner race32ais sandwiched by the inner ring retainer41and the spacer32dfrom both sides in the axis direction.

Of the pair of inner races32a, the other inner race32alocated on the other side in the axis direction is disposed between the spacer32dand the outer circumferential step portion25ain the axis direction. The spacer32dcontacts the end surface facing one side of the other inner race32ain the axis direction. The outer circumferential step portion25acontacts the end surface facing the other side of the other inner race32ain the axis direction. That is, the other inner race32ais sandwiched by the spacer32dand the outer circumferential step portion25afrom both sides in the axis direction.

Further, although particularly not shown, the surface21dfacing one side of the first rotation body21in the axis direction may contact an end surface facing the other side of the other inner race32ain the axis direction. In this case, the other inner race32ais sandwiched by the spacer32dand the surface21dfacing one side of the first rotation body21in the axis direction from both sides in the axis direction.

The outer race32bhas a tubular shape centered on the second center axis C2. The outer race32bis located on the outside of the second radial direction in relation to the inner race32a. The outer race32bis fitted to the inner circumferential surface of the external gear23, that is, the inner circumferential surface of the recess27. A plurality of the outer races32bare provided side by side in the axis direction. In the embodiment, the second bearing32includes a pair of the outer races32bdisposed with a gap therebetween in the axis direction. The second outer race support part23bis disposed between the pair of outer races32b.

Of the pair of outer races32b, the second outer race support part23bcontacts the end surface facing the other side in the axis direction of one outer race32blocated on one side in the axis direction.

Of the pair of outer races32b, the second outer race support part23bcontacts the end surface facing one side in the axis direction of the other outer race32blocated on the other side in the axis direction.

The rolling element32cis a columnar roller or the like. The rolling element32cis disposed between the inner race32aand the outer race32bin the second radial direction. A plurality of the rolling elements32care provided side by side in the second circumferential direction. A plurality of rows of the rolling elements32carranged in the second circumferential direction (hereinafter, simply referred to as the rows of the rolling elements32c) are provided side by side in the axis direction. In the embodiment, the second bearing32includes a row of a pair of the rolling elements32cdisposed with a gap therebetween in the axis direction.

Of the rows of the pair of rolling elements32c, the row of one rolling elements32clocated on one side of the axis direction is rotatably held between one inner race32aand one outer race32b.

Of the rows of the pair of rolling elements32c, the row of the other rolling elements32clocated on the other side in the axis direction is rotatably held between the other inner race32aand the other outer race32b.

The internal gear16, the external gear23, the recess27, the second bearing32, and the convex part25overlap each other when viewed from the second radial direction. That is, the internal gear16, the external gear23, the recess27, the second bearing32, and the convex part25respectively include a portion disposed at the same position in the axis direction. The second bearing32is disposed to overlap the internal gear16and the external gear23over the entire length in the axis direction when viewed from the second radial direction.

A part of the second bearing32in the second circumferential direction and a part of the first bearing31in the first circumferential direction are disposed to overlap each other when viewed from the axis direction. That is, a part of the second bearing32overlaps a part of the first bearing31when viewed from the axis direction.

The air joint member40is attached to the convex part25and the top wall portion22b. The air joint member40is formed such that air can flow therein and constitutes a part of the flow path of the air supply path28.

The air joint member40includes an inner ring retainer41, an outer cylinder42, and an inner cylinder43.

The inner ring retainer41has a disc shape centered on the second center axis C2to spread in a direction perpendicular to the second center axis C2. A plate surface facing the other side of the inner ring retainer41in the axis direction contacts the surface facing one side of the convex part25in the axis direction. The inner ring retainer41is fixed to the convex part25by screwing or the like. The outer circumferential portion of the inner ring retainer41protrudes outward in the second radial direction in relation to the outer circumferential surface of the convex part25. The outer circumferential portion of the inner ring retainer41contacts one inner race32aof the second bearing32from one side in the axis direction. That is, the inner ring retainer41presses the inner race32aof the second bearing32from one side in the axis direction.

The inner ring retainer41includes a retainer air hole41a.

The retainer air hole41apenetrates the inner ring retainer41in the axis direction. The retainer air hole41ahas a circular hole shape centered on the second center axis C2.

The outer cylinder42has a cylindrical shape centered on the second center axis C2and extends in the axis direction. The outer cylinder42is inserted into the fitting insertion hole22c. The outer cylinder42is fitted to the inner circumferential surface of the fitting insertion hole22c. The outer cylinder42is fixed to the top wall portion22bby screwing or the like.

The outer cylinder42includes an outer cylinder air hole42a.

The outer cylinder air hole42apenetrates the circumferential wall of the outer cylinder42in the second radial direction. The outer cylinder air hole42ais located on a virtual line connecting the second center axis C2and the center axis A of the ram shaft connection part35when viewed from the axis direction.

The inner cylinder43has an eclipsed cylinder shape centered on the second center axis C2and extends in the axis direction. The other end portion of the inner cylinder43in the axis direction contacts the plate surface facing one side of the inner ring retainer41in the axis direction. The inside of the inner cylinder43communicates with the retainer air hole41aof the inner ring retainer41. The inner cylinder43is fixed to the inner ring retainer41by screwing or the like. That is, the inner cylinder43is fixed to the convex part25through the inner ring retainer41. The inner cylinder43and the outer cylinder42are relatively rotatable around the second center axis C2.

The inner cylinder43includes an inner cylinder air groove43aand an inner cylinder air hole43b.

The inner cylinder air groove43ais recessed inward in the second radial direction from the outer circumferential surface of the inner cylinder43and extends in the second circumferential direction. The inner cylinder air groove43ahas an annular shape centered on the second center axis C2. The inner cylinder air groove43acommunicates with the outer cylinder air hole42a.

The inner cylinder air hole43bpenetrates the circumferential wall of the inner cylinder43in the second radial direction. The inner cylinder air hole43bextends in the second radial direction and opens to the inner circumferential surface of the inner cylinder43and the inner cylinder air groove43a. The inside of the inner cylinder43and the inner cylinder air groove43acommunicate with each other through the inner cylinder air hole43b. A plurality of the inner cylinder air holes43bare provided side by side in the second circumferential direction. The plurality of inner cylinder air holes43bare arranged radially around the second center axis C2.

As shown inFIGS.2to4, the ram shaft connection part35is connected to the second rotation body22and is moved linearly in a reciprocating manner along a predetermined direction (stroke direction S) in the first radial direction. The ram shaft connection part35has a bottomed cylindrical shape and extends in the axis direction. The ram shaft connection part35opens to one side in the axis direction.

The ram shaft connection part35protrudes from the top wall portion22btoward one side in the axis direction. The ram shaft connection part35is located on one side in the axis direction in relation to the housing15. The ram shaft connection part35protrudes from the top wall portion22btoward the outside of the second radial direction. In the embodiment, a part of the ram shaft connection part35(a part other than an air cylinder35ato be described later) is integrally formed with the top wall portion22b.

The center axis A of the ram shaft connection part35is parallel to the first center axis C1. The center axis A of the ram shaft connection part35is disposed in parallel to the second center axis C2to be away therefrom. The distance between the center axis A and the second center axis C2in the second radial direction is the same as the distance between the first center axis C1and the second center axis C2in the second radial direction. When the reciprocating linear motion mechanism10is viewed from the axis direction, the center axis A of the ram shaft connection part35is located on the pitch circle diameter of the external teeth23aof the external gear23.

The ram shaft connection part35includes an air cylinder35a.

The air cylinder35ais disposed inside the ram shaft connection part35. The air cylinder35ahas a tubular shape centered on the center axis A and extends in the axis direction. The air cylinder35ais formed such that air can flow therein and constitutes a part of the flow path of the air supply path28.

InFIG.1, the ram shaft connection part35is connected to the ram shaft3through a connection bearing54(seeFIG.7) provided in the outer circumferential portion of the ram shaft connection part35. The connection bearing54connects the ram shaft connection part35and the ram shaft3to be relatively rotatable around the center axis A.

As shown inFIGS.4and5, the first weight part51is connected to the first rotation body21and is located on the side opposite to the second center axis C2with the first center axis C1interposed therebetween in the first radial direction. The first weight part51functions as a so-called counterweight for maintaining a good rotational balance in the first circumferential direction when the first rotation body21, the convex part25, the second bearing32, the second rotation body22, the recess27, the ram shaft connection part35, and the second weight part52rotate around the first center axis C1.

The first weight part51is disposed on one side of the first rotation body21in the axis direction. The first weight part51has a semicircular plate shape. A surface facing the other side of the first weight part51in the axis direction contacts the surface21dfacing one side of the first rotation body21in the axis direction. An outer end portion, that is, an outer circumferential portion of the first weight part51in the first radial direction protrudes outward in the first radial direction in relation to the outer circumferential surface of the first rotation body21. The outer circumferential portion of the first weight part51overlaps the first bearing31when viewed from the axis direction.

The first weight part51is fixed to the first rotation body21by a plurality of bolt members53arranged in the first circumferential direction. Each bolt member53extends in the axis direction. Each bolt member53is inserted into the bolt insertion hole penetrating the first weight part51in the axis direction and is screwed into the female screw hole of the first rotation body21.

As shown inFIGS.2to4andFIG.6, the second weight part52is connected to the second rotation body22and is located on the side opposite to the ram shaft connection part35with the second center axis C2interposed therebetween in the second radial direction. The second weight part52functions as a so-called counterweight for maintaining a good rotational balance in the second circumferential direction when the second rotation body22and the ram shaft connection part35rotate around the second center axis C2.

The second weight part52protrudes outward in the second radial direction from the top wall portion22b. The second weight part52and the top wall portion22bhave a substantially disc shape as a whole. The second weight part52is integrally formed with a part of the ram shaft connection part35and the top wall portion22b.

As shown inFIG.4, the shaft body26has a multi-stage columnar shape centered on the first center axis C1and extends in the axis direction. The shaft body26is disposed on the other side of the first rotation body21in the axis direction. The outer diameter of the shaft body26is smaller than the outer diameter of the first rotation body21. The outer diameter of one end portion of the shaft body26in the axis direction is larger than the outer diameter of the portion other than the one end portion of the shaft body26in the axis direction. One end portion of the shaft body26in the axis direction is fitted into the opening portion of the hole portion21aof the first rotation body21. One end portion of the shaft body26in the axis direction is fixed to the other end portion of the first rotation body21in the axis direction by a screw member or the like. That is, the shaft body26is fixed to the first rotation body21.

The shaft body26is supported by a third bearing (not shown) to be rotatable around the first center axis C1. The rotational driving force of the first rotation direction T1is input from a drive source (not shown) to the shaft body26. The shaft body26and the first rotation body21are rotated in the first rotation direction T1with respect to the housing15by the rotational driving force of the drive source.

The air supply path28is an air flow path which is formed inside the reciprocating linear motion mechanism10. The air supply path28extends inside the shaft body26, inside the first rotation body21, inside the convex part25, inside the air joint member40, inside the top wall portion22bof the second rotation body22, and inside the ram shaft connection part35.

The air supply path28includes a first air flow path28a, an air chamber29, a second air flow path28b, an air joint flow path28c, a third air flow path28d, and a fourth air flow path28e. The first air flow path28a, the air chamber29, the second air flow path28b, the air joint flow path28c, the third air flow path28d, and the fourth air flow path28ecommunicate with each other. Air supplied from an air supply source (not shown) to the air supply path28flows through the air supply path28from the upstream side to the downstream side in order of the first air flow path28a, the air chamber29, the second air flow path28b, the air joint flow path28c, the third air flow path28d, and the fourth air flow path28e.

The first air flow path28ais disposed inside the shaft body26. In the embodiment, the first air flow path28ais located at the other end portion of the shaft body26in the axis direction and extends on the first center axis C1in the axis direction.

The air chamber29is disposed inside the shaft body26and the first rotation body21. The air chamber29is formed over a portion other than the other end portion of the shaft body26in the axis direction and the hole portion21aof the first rotation body21. The air chamber29extends on the first center axis C1in the axis direction. The air chamber29has the largest flow path cross-sectional area and the largest volume among the flow paths constituting the air supply path28. The air chamber29can temporarily store air (compressed air) inside the air chamber29.

The second air flow path28bis disposed inside the first rotation body21and the convex part25. The second air flow path28bextends on the second center axis C2in the axis direction. The other end portion of the second air flow path28bin the axis direction opens into the hole portion21a. One end portion of the second air flow path28bin the axis direction opens to a surface facing one side of the convex part25in the axis direction.

The air joint flow path28cincludes a retainer air hole41a, an inside (inner space) of an inner cylinder43, an inner cylinder air hole43b, an inner cylinder air groove43a, and an outer cylinder air hole42a. Air flowing from the second air flow path28binto the air joint flow path28cflows through the retainer air hole41a, the inner cylinder43, the inner cylinder air hole43b, the inner cylinder air groove43a, and the outer cylinder air hole42ain this order and flows out to the third air flow path28d.

The third air flow path28dis disposed inside the top wall portion22band extends in the second radial direction. The third air flow path28dextends along a virtual line connecting the second center axis C2and the center axis A of the ram shaft connection part35when viewed from the axis direction. An inner end portion of the third air flow path28din the second radial direction is connected to the outer cylinder air hole42a. An outer end portion of the third air flow path28din the second radial direction is blocked by a plug28f.

The fourth air flow path28eis disposed inside the ram shaft connection part35. The fourth air flow path28eextends on the center axis A of the ram shaft connection part35in the axis direction. The other end portion of the fourth air flow path28ein the axis direction is connected to the third air flow path28d. One end portion of the fourth air flow path28ein the axis direction is connected to an air communication path (not shown). A portion other than the other end portion of the fourth air flow path28ein the axis direction is formed by (the inner space of) the air cylinder35a.

The first oil supply path36penetrates the housing15and supplies oil to the first bearing31. In the embodiment, the first oil supply path36penetrates the circumferential wall of the housing body17. An outer end portion of the first oil supply path36in the first radial direction opens to the outer circumferential surface of the housing body17. An inner end portion of the first oil supply path36in the first radial direction opens to the inner circumferential surface of the housing body17. That is, the first oil supply path36extends through the housing15and opens toward the first bearing31. Oil is supplied from the outside of the housing15to the first oil supply path36through a first oil supply port36a(seeFIG.2) provided in the outer circumferential portion of the housing body17.

A plurality of the first oil supply paths36are provided. The plurality of first oil supply paths36are arranged at intervals in the first circumferential direction. The plurality of first oil supply paths36include one first oil supply path36extending linearly through the housing body17and another first oil supply path36extending through the housing body17in a crank shape in a bent state.

In the embodiment, at least one first oil supply path36is disposed at a portion located above the first center axis C1in the vertical direction of the housing body17. Therefore, oil supplied to the first bearing31from above is likely to stably spread in the entire first bearing31.

As shown inFIGS.4and8, the second oil supply path37penetrates the internal gear16and the external gear23and supplies oil to the second bearing32. The second oil supply path37includes an internal gear flow path37aand an external gear flow path37b.

The internal gear flow path37apenetrates the circumferential wall of the internal gear16. In the embodiment, the internal gear flow path37apenetrates the internal gear16in the first radial direction. The outer end portion of the internal gear flow path37ain the first radial direction opens to the outer circumferential surface of the internal gear16. The inner end portion of the internal gear flow path37ain the first radial direction opens to the inner circumferential surface, that is, the internal teeth16aof the internal gear16. That is, the internal gear flow path37aextends through the internal gear16and opens to at least the internal teeth16a. Oil is supplied from the outside of the housing15to the internal gear flow path37athrough a second oil supply portion37cprovided in the outer circumferential portion of the internal gear16.

The external gear flow path37bpenetrates the circumferential wall of the external gear23. In the embodiment, the external gear flow path37bpenetrates the external gear23in the second radial direction. The outer end portion of the external gear flow path37bin the second radial direction opens to the outer circumferential surface, that is, the external teeth23aof the external gear23. The inner end portion of the external gear flow path37bin the second radial direction opens to the inner circumferential surface of the second outer race support part23b. That is, the external gear flow path37bextends through the external gear23and includes a portion opening to the external teeth23aand a portion opening to the second bearing32.

A plurality of the second oil supply paths37are provided. That is, a plurality of sets of the internal gear flow path37aand the external gear flow path37bare provided. In the embodiment, for example, three or more second oil supply paths37are provided. That is, three or more sets of the internal gear flow path37aand the external gear flow path37bare provided. The plurality of internal gear flow paths37aare arranged at intervals in the first circumferential direction. The plurality of external gear flow paths37bare provided at intervals in the second circumferential direction.

As shown inFIG.8, when the external gear23is disposed at a predetermined position around the first center axis C1with respect to the internal gear16, the internal gear flow path37aand the external gear flow path37bface each other and communicate with each other in the first radial direction. Specifically, when the external gear23revolves in the first circumferential direction along the inner circumferential portion of the internal gear16while rotating in the second circumferential direction to be disposed at a predetermined position in the first circumferential direction, the internal gear flow path37aand the external gear flow path37bcommunicate with each other through a meshing portion between the internal teeth16aand the external teeth23a. Accordingly, oil in the internal gear flow path37aflows into the external gear flow path37band oil in the external gear flow path37bflows through the external gear flow path37binward in the second radial direction and is discharged toward the second bearing32.

The number of the internal teeth16aof the internal gear16is twice the number of the external teeth23aof the external gear23. Therefore, the internal gear flow path37aand the external gear flow path37bface each other at the predetermined position at each rotation, that is, each revolution around the first center axis C1of the external gear23. That is, the inflow of oil from the internal gear flow path37ato the external gear flow path37band the discharge of oil from the external gear flow path37bto the second bearing32are performed at each revolution of the external gear23.

In the embodiment, at least one internal gear flow path37ais disposed at a portion located above the first center axis C1in the vertical direction of the internal gear16. Further, at least one external gear flow path37bfaces and communicates with the internal gear flow path37aat a portion located above the second center axis C2in the vertical direction of the external gear23. That is, when the internal gear flow path37aand the external gear flow path37bcommunicate with each other, oil flowing through the internal gear flow path37ais supplied to the second bearing32from above through the external gear flow path37b. Therefore, oil is likely to stably spread in the entire second bearing32.

Although particularly not shown, the gear has a disc shape centered around the first center axis C1. The inner circumferential surface of the gear is fitted to the outer circumferential surface of one end portion of the shaft body26in the axis direction. A surface facing one side of the gear in the axis direction contacts the surface21efacing the other side of the first rotation body21in the axis direction. The gar is fixed to the surface21efacing the other side of the first rotation body21in the axis direction by a screw fixing or the like. That is, the gear is provided in the first rotation body21. Further, the gear may be fixed to the shaft body26. At least a part of the gear is exposed to the outside of the housing15. The gear is connected to a cup holder driving mechanism (not shown) or the like through a connection gear (not shown). The gear outputs the rotational driving force around the first center axis C1of the first rotation body21and the shaft body26to the outside of the reciprocating linear motion mechanism10.

In the reciprocating linear motion mechanism10of the above-described embodiment, when the rotational driving force around the first center axis C1is transmitted from a drive source (not shown) to the shaft body26and the first rotation body21, the first rotation body21is rotated around the first center axis C1with respect to the housing15. When the first rotation body21is rotated around the first center axis C1, the second rotation body22supported by the first rotation body21is also rotated around the first center axis C1.

At this time, since the external gear23of the second rotation body22meshes with the internal gear16of the housing15, the second rotation body22is also rotated (turned) around the second center axis C2while being rotated (revolved) around the first center axis C1. When the reciprocating linear motion mechanism10is viewed from the axis direction, the first rotation direction T1in which the second rotation body22is revolved around the first center axis C1and the second rotation direction T2in which the second rotation body22is turned around the second center axis C2are opposite to each other.

The ram shaft connection part35connected to the second rotation body22is moved linearly in a reciprocating manner along a predetermined direction, that is, the stroke direction S in the first radial direction.

In this way, the reciprocating linear motion mechanism10of the embodiment converts the rotational driving force input to the first rotation body21into the reciprocating linear motion in the stroke direction S and outputs the result to the ram shaft connection part35. Accordingly, the punch2connected to the ram shaft connection part35through the ram shaft3is moved linearly in a reciprocating manner in the stroke direction S. Thus, it is possible to perform DI processing on the cup-shaped body W by the punch2, the die8, the cup holder6, and the like and to form the cup-shaped body W as the DI can100.

Then, according to the embodiment, the internal gear16, the external gear23, the recess27, the second bearing32, and the convex part25are disposed to overlap each other when viewed from the second radial direction. That is, since the axis positions of the internal gear16, the external gear23, the recess27, the second bearing32, and the convex part25are the same as each other, it is possible to suppress the bulkiness of the axial dimension of the reciprocating linear motion mechanism10. Thus, it is possible to suppress the outer shape of the reciprocating linear motion mechanism10in the axis direction to be small and to simplify the structure.

Since the outer shape of the reciprocating linear motion mechanism10is suppressed to be small, it is possible to reduce the power consumption of the drive motor or the like that drives the reciprocating linear motion mechanism10. Therefore, the production efficiency of the DI can100is improved.

Since the axis position of the second bearing32connecting the convex part25and the recess27, that is, the bearing32connecting the first rotation body21and the second rotation body22is the same as the axial position of the meshing portion between the internal gear16and the external gear23, it is possible to suppress an unbalanced load from acting on the bearing32. Accordingly, the load on the bearing32is reduced and the life of the parts of the bearing32can be extended.

Further, in the embodiment, the second bearing32is disposed to overlap the internal gear16and the external gear23over the entire length in the axis direction when viewed from the second radial direction.

In this case, since the internal gear16and the external gear23mesh with each other, it is possible to suppress a load acting on the second bearing32from the second radial direction from varying at each position of the second bearing32in the axis direction. Since a load on the second bearing32is equalized in the axis direction, the function of the second bearing32is maintained satisfactorily and the frequency of maintenance or the like can be reduced.

Further, in the embodiment, a part of the second bearing32and a part of the first bearing31overlap each other when viewed from the axis direction.

For example, according to the above-described configuration of the embodiment, the diameter of the first bearing31is suppressed to be small compared to a case in which the first bearing31does not overlap the second bearing32when viewed from the axis direction and disposed on the outside of the first radial direction in relation to the second bearing32unlike the embodiment. Therefore, it is possible to suppress the outer shape of the reciprocating linear motion mechanism10in the first radial direction to be small.

Further, in the embodiment, the rotational driving force around the first center axis C1of the first rotation body21can be output to the outside of the reciprocating linear motion mechanism10through a gear. For example, the cup holder driving mechanism and the like other than the reciprocating linear motion mechanism10provided in the can body maker1can be stably operated while being synchronized with the operation of the reciprocating linear motion mechanism10.

Then, according to the embodiment, since the top wall portion22band the external gear23of the second rotation body22are separated from each other, at least the external gear23can be manufactured alone. The external gear23can be easily manufactured without requiring particular equipment or the like and the manufacturing cost can be reduced. Further, the external gear23and the top wall portion22bcan be separately assembled to or separated from the apparatus during the assembly of the reciprocating linear motion mechanism10or the maintenance or the like of parts of the second bearing32or the like connecting the first rotation body21and the second rotation body22. Specifically, an operator can assemble the external gear23and the top wall portion22bto the apparatus in this order from one side of the reciprocating linear motion mechanism (device)10in the axis direction or separate the top wall portion22band the external gear23in this order from the device. Accordingly, each operation is simplified and the operation time is shortened. Thus, according to the embodiment, the members can be easily manufactured, the manufacturing cost can be reduced, and the workability such as assembly and maintenance is good.

Since workability such as maintenance is good, it is possible to shorten the time for stopping the operation of the can body maker1for maintenance or the like. That is, the operation time of the can body maker1can be increased and the production efficiency of the DI can100is improved.

When the operator separates the top wall portion22bfrom the external gear23, it is easy to access the bearing32disposed inside the external gear23and connecting the first rotation body21and the second rotation body22from the outside of the apparatus. Since the maintenance of the bearing32is good, the function of the bearing32can be maintained satisfactorily and the life of parts can be extended.

Further, in the embodiment, the external gear23has a tubular shape centered on the second center axis C2, the top wall portion22bblocks one opening of the external gear23in the axis direction, and the second bearing32is interposed between the inner circumferential surface of the external gear23and the outer circumferential surface of the convex part25.

In this case, it is possible to easily access the second bearing32inside the external gear23when the operator separates the top wall portion22bfrom one side in the axis direction. That is, it is possible to access the second bearing32even when the external gear23is not separated from the apparatus. If necessary, the external gear23or the second bearing32can be easily separated from the apparatus. Therefore, workability such as maintenance is improved. Further, the attachment structure of the second bearing32can be simplified and the reciprocating linear motion mechanism10can have a compact configuration.

Further, in the embodiment, the pin member34is fitted to the first fitting hole22fand the second fitting hole23cand the bolt member24is inserted into the bolt insertion hole22gand is screwed into the female screw hole23d.

In this case, the top wall portion22band the external gear23can be fixed by the bolt member24while the top wall portion22band the external gear23are positioned around the second center axis C2by the pin member34. Therefore, the positional accuracy of the external gear23and the ram shaft connection part35connected to the top wall portion22bis stably ensured. Further, a force generated in the second circumferential direction between the top wall portion22band the external gear23during the operation or the like of the reciprocating linear motion mechanism10can be received by the pin member34which can more easily ensure rigidity than the bolt member24. Accordingly, damage or the like of the bolt member24is suppressed. The relative movement of the top wall portion22band the external gear23in the second circumferential direction is regulated by the pin member34and the relative movement of the top wall portion22band the external gear23in the axis direction is regulated by the bolt member24.

Further, in the embodiment, the top wall portion22bincludes a fitting cylinder part22dwhich is fitted to the inner circumferential surface of the cylindrical external gear23.

In this case, since the external gear23and the fitting cylinder part22dare fitted to each other, the external gear23and the top wall portion22bare positioned in the second radial direction. Further, a force generated in the second radial direction between the top wall portion22band the external gear23during the operation or the like of the reciprocating linear motion mechanism10can be received by the fitting cylinder part22dwhich can more easily ensure rigidity than the bolt member24. Accordingly, damage or the like the bolt member24is suppressed. The relative movement of the top wall portion22band the external gear23in the second radial direction is regulated by the fitting cylinder part22d.

Then, in the embodiment, when the external gear23revolves around the first center axis C1along the inner circumferential portion of the internal gear16while turning around the second center axis C2to be disposed at a predetermined position around the first center axis C1as shown inFIG.8, the internal gear flow path37aand the external gear flow path37bare connected through a meshing portion between the internal teeth16aand the external teeth23a. Accordingly, oil inside the internal gear flow path37aflows into the external gear flow path37b. The oil flowing into the external gear flow path37bis discharged from the inside of the external gear flow path37btoward the second bearing32. According to the embodiment, oil can be stably supplied to the second bearing32connecting the first rotation body21and the second rotation body22even during the operation of the can body maker1. The second bearing32is stably cooled and lubricated by oil and the performance of the second bearing32is maintained satisfactorily.

Since oil can be supplied to the second bearing32during the operation of the can body maker1, the function of the second bearing32is maintained satisfactorily and the frequency of stopping the operation of the can body maker1for the maintenance or the like of the second bearing32can be reduced. That is, the operation time of the can body maker1can be increased and the production efficiency of the DI can100is improved.

Since oil is stably supplied to the second bearing32connecting the first rotation body21and the second rotation body22, the life of parts of the second bearing32can be extended.

Further, in the embodiment, the first rotation body21and the second rotation body22are connected to each other by the convex part25, the recess27, and the second bearing32interposed therebetween, that is, the second bearing32connects the convex part25and the recess27to be relatively rotatable around the second center axis C2. Therefore, it is possible to simplify the structure of the reciprocating linear motion mechanism10.

Further, in the embodiment, the external gear flow path37bpenetrates the external gear23in the second radial direction.

In this case, the external gear flow path37bcan be formed in, for example, a simple shape such as a linear hole, the friction loss (resistance) of the oil flowing through the external gear flow path37bcan be reduced, and oil can be stably supplied to the second bearing32.

Further, in the embodiment, the internal gear16, the external gear23, the recess27, the second bearing32, and the convex part25are disposed to overlap each other when viewed from the second radial direction. That is, since the axis positions of the internal gear16, the external gear23, the recess27, the second bearing32and the convex part25are the same as each other, it is possible to easily form the second oil supply path37penetrating the internal gear16and the external gear23and opening toward the second bearing32and to suppress the flow path length of the second oil supply path37to be short.

Further, in the embodiment, the second bearing32is disposed to overlap the internal gear16and the external gear23over the entire length of the axis direction when viewed from the second radial direction.

In this case, oil is easily supplied from the second oil supply path37to the entire area of the second bearing32in the axis direction and the performance of the second bearing32becomes more stable.

Additionally, the present invention is not limited to the above-described embodiment and, for example, as described below, the configuration can be changed in the scope not deviating from the spirit of the present invention.

The method of pressing the inner races31aand32a, the outer races31band32b, and the spacers31dand32dof the first bearing31and the second bearing32, that is, the fixing means is not limited to the configurations described in the above-described embodiment.

The shape of each of the first weight part51and the second weight part52is not limited to each shape described in the above-described embodiments.

In the above-described embodiment, an example in which each of the second fitting hole23cand the female screw hole23dis the retaining hole recessed from the surface23efacing one side of the external gear23in the axis direction toward the other side in the axis direction has been described, but the present invention is not limited thereto. The second fitting hole23cmay be a through-hole penetrating the external gear23in the axis direction. The female screw hole23dmay be a through-hole penetrating the external gear23in the axis direction.

In the above-described embodiment, an example in which one set of the first fitting hole22f, the second fitting hole23c, and the pin member34is provided has been described, but the present invention is not limited thereto. For example, a plurality of sets of the first fitting hole22f, the second fitting hole23c, and the pin member34may be provided at intervals in the second circumferential direction.

In the above-described embodiment, an example in which the plate-shaped top wall portion22bis the connection part connecting the external gear23and the ram shaft connection part35has been described, but the present invention is not limited thereto. That is, the connection part of the second rotation body22may have a shape other than the top wall portion22b, that is, a columnar shape or a block shape other than the plate shape.

In the above-described embodiment, an example in which the fitting cylinder part22dis fitted to the inner circumferential surface of the external gear23has been described, but the present invention is not limited thereto. The fitting cylinder part22dmay be fitted to the outer circumferential surface of the external gear23. Even in this case, the same effect as described above can be obtained.

The present invention may combine the configurations described in the above-described embodiments, modifications, and the like as long as the gist of the present invention is not deviated and may add, omit, replace, and change the configurations in other forms. Further, the present invention is not limited by the above-described embodiments and the like, but is limited only by the claims.

According to the reciprocating linear motion mechanism for the can body maker and the can body maker of the present invention, it is possible to improve the production efficiency of the can. Further, it is possible to extend the life of parts of the bearing connecting the first rotation body and the second rotation body to be relatively rotatable. Further, it is possible to suppress the outer shape of the reciprocating linear motion mechanism to be small. Further, it is possible to reduce a manufacturing cost since the members are easily manufactured and obtain good workability such as assembly and maintenance. Further, it is possible to stably supply oil to the bearing connecting the first rotation body and the second rotation body. Thus, the present invention has industrial applicability.

EXPLANATION OF REFERENCES

1Can body maker2Punch3Ram shaft6Cup holder7Through-hole8Die9End surface10Reciprocating linear motion mechanism15Housing16Internal gear16aInternal teeth21First rotation body21dSurface facing one side of first rotation body in axis direction22Second rotation body22bTop wall portion (connection part)22dFitting cylinder part22eSurface facing other side of second rotation body in axis direction22fFirst fitting hole22gBolt insertion hole23External gear23aExternal teeth23cSecond fitting hole23dFemale screw hole23eSurface facing one side of external gear in axis direction24Bolt member25Convex part27Recess31First bearing32Second bearing (bearing)34Pin member35Ram shaft connection part37Second oil supply path (oil supply path)37aInternal gear flow path37bExternal gear flow pathC1First center axisC2Second center axis