Patent Description:
In the fabrication of sheet metal and other workpieces, automated machinery may be employed, including turret presses and other industrial presses. Turret presses typically have an upper turret that holds a series of punches at locations spaced circumferentially about its periphery, and a lower turret that holds a series of dies at locations spaced circumferentially about its periphery. The press can be rotated about a vertical axis to bring a desired punch and die set into vertical alignment at a work station. By appropriately rotating the upper and lower turrets, an operator can bring a number of different punch and die sets sequentially into alignment at the work station in the process of performing a series of different pressing operations. Turret press multi-tools thus expand press operations by providing a variety of tools in a single assembly, analogous to a turret within a turret.

Multi-tools for turret presses advantageously allow a plurality of different tools to be available at a single tool-mount location on the press. Thus, in place of a tool with only one punch, there can be provided a multi-tool carrying a number of different punches. With such a multi-tool, any one of a plurality of punches carried by the multi-tool can be selected and moved to an operable position. When a multi-tool punch assembly is struck from above by the punch press ram, a single, selected punch element or punch insert within the assembly is driven downwardly through the workpiece to perform the punching operation, while the other punches (those not selected) remain inactive. When released, the punch insert is retracted by a spring or similar component provided in the multi-tool punch assembly. Different multi-tool designs employ different mechanisms in the punch press and the multi-tool to select one pair of complementary tools for a given operation, while the other tools remain inactive. Most preexisting mechanisms simply do not connect the unselected punches with movement of the press ram.

Piercing in a multi-tool is very common, but preexisting multi-tool assemblies often lack multiple forming dies due to concerns that additional forming dies could interfere with a workpiece due to the close proximity of the dies and protrusion of each die up toward the workpiece. Accordingly, adding multiple forming dies, e.g., positioned below a workpiece, would be desirable. Adding forming tools, e.g., punches, to preexisting multi-tool assemblies in a manner that better facilitates interchangeability between individual tools would also be desirable. Selecting individual tools via a locking or latching mechanism, for example similar to the locking mechanism described in <CIT>), would also be desirable for improved ease of use.

]<CIT>discloses the features of the first part of claims <NUM> and <NUM>. Further prior art is specified in <CIT>, <CIT> and <CIT>.

Multi-tool assemblies include multiple forming dies and multiple punches. A multi-die carrier assembly is configured to provide automated displacement of individual forming dies by selectively elevating and/or supporting each die, one at a time, to a useful height for forming operations, while the other, unselected dies are lowered or retracted, thereby protecting the workpiece from unwanted damage. When no die from the multi-tool is needed for a punching operation, the multi-tool could be such that all dies are in the down inactive position to avoid any unnecessary sheet marking.

In the following, a die carrier is also referred to as a die locator component and a die selector is also referred to as a cam base. Furthermore, in the following, according to the invention, all the embodiments rely on a relative rotation between the die carrier and the die selector.

<FIG> is an isometric view of a multi-tool assembly <NUM>, which may also be referred to as a forming punch tool assembly or upper assembly. As shown, multi-tool assembly <NUM> includes three punch stations <NUM>, <NUM>, <NUM> coupled with a punch guide body <NUM>. Each punch station can include a uniquely sized and/or shaped forming punch tool. The punch guide body <NUM> is attached to a punch carrier <NUM> and an upper portion or cap <NUM> of a striker body. The striker body may be generally cylindrical in shape, with a wider diameter defining the cap <NUM>, which in some examples forms the top face of multi-tool assembly <NUM>. A narrower portion of the striker body may be inserted within punch carrier <NUM>, as shown for example in <FIG>. The specific forming tool to be employed for a particular operation can be selected by positioning an internal ram over the selected tool, thereby positioning the tool to be engaged by the press striker ram. The multi-tool <NUM> shown in <FIG> includes three forming punch tools ("punches" or "tools"); additional embodiments may include two, three, four, five, six, seven or more tools.

<FIG> is an isometric view of a multi-die carrier assembly <NUM> which includes three work stations containing forming dies <NUM>, <NUM>, <NUM>, respectively. As shown, the body of the multi-die carrier assembly <NUM> may define a generally circular perimeter, although the shape may change in different embodiments. The work stations of multi-die carrier assembly <NUM> may be complementary to the punch stations included in multi-tool assembly <NUM>, such that punch stations <NUM>, <NUM>, <NUM> can be aligned with, and engage, forming dies <NUM>, <NUM> and <NUM>, respectively, during a forming operation. Forming die <NUM> defines a central forming portion <NUM>, forming die <NUM> defines a protruding forming portion <NUM>, and forming die <NUM> defines a tab forming portion <NUM>. Multi-die carrier assembly <NUM> is comprised of a die locator component <NUM> and a cam base <NUM>, which may be referred to as upper and lower components, respectively, depending on orientation. A slidable lock pin <NUM> is visible at a sidewall of die locator component <NUM>. In operation, movement of lock pin <NUM> causes locking and unlocking of die locator component <NUM> with respect to cam base <NUM>. When unlocked, cam base <NUM> can be rotated relative to die locator component <NUM>. Accordingly, in this embodiment, die locator component <NUM> can remain stationary, while came base <NUM> can be configured to rotate. In additional examples, die locator component <NUM> may be configured to rotate, while cam base <NUM> remains stationary. In some examples, one or more of the stationary components included within a given assembly may be referred to as a stator component.

An internal cam ramp defined by cam base <NUM>, upon rotation thereof, selectively elevates individual forming dies, one-by-one, into a position for forming a workpiece. The multi-die carrier assembly <NUM> shown in <FIG> includes a single lock pin <NUM>; additional embodiments may include, e.g., one, two, three or more lock pins. In addition or alternatively, one or more cams or levers can be included to actuate the engagement of die locator component <NUM> and/or cam base <NUM>. The multi-die carrier assembly <NUM> shown in <FIG> includes three forming dies, but additional embodiments may include <NUM>, <NUM>, <NUM>, <NUM>, <NUM> or more dies. Together, assemblies <NUM> and <NUM> may comprise a punch and die set and selection apparatus, which may be configured to work cooperatively with an automated punch press in some examples to select one of a set of punches and dies to operate within the apparatus to be engaged with a load-applying ram and tool holders, and to compel or allow the non-selected die or dies to be moved away from a sheet material or workpiece.

<FIG> is a section view of multi-tool assembly <NUM> in a relaxed configuration, in which none of the forming punch tools have been lowered into a punching configuration. Within punch guide body <NUM>, a punch driver <NUM> is included, along with a ball plunger <NUM>. A forming punch tool <NUM> is shown in a first, inactive position. In this position, forming punch tool <NUM> is not lowered into a position for operating on a workpiece. Within punch carrier <NUM>, striker body <NUM> is also shown, which defines a striker ram <NUM>, both components positioned below striker cap <NUM>. In total, multi-tool assembly <NUM> may include three punch drivers, one for each work station, but the number of punch drivers and work stations may vary, ranging from one to <NUM> or more in various embodiments. The remainder of the forming punch drivers (the "inactive" punch drivers) are not shown in this cross-section. Each forming punch driver <NUM> may be identical in structure, and can be designed to be fitted with differing punches. When the press apparatus within which multi-tool assembly <NUM> is mounted strokes the selected punch downward pursuant to a workpiece forming operation, the non-selected forming punch tools can remain in the upward, inactive position within the assembly. Selection of each individual forming punch tool can be achieved by rotating striker ram <NUM>, which may be effected via a gear drive, shot pin, external rotating ram, auto-index mechanism, or similar means, for example as described in <CIT>) and/or <CIT>. The specific forming punch tool and angle of the tool relative to a workpiece can each be adjusted in some examples. Multi-tool assembly <NUM> also has a reduced stripping force, or punch-lifting force, relative to preexisting multi-tool assemblies, allowing smaller lift springs to be included in the assembly. Multi-tool assembly <NUM> also has extra clearance at the punch tip area relative to preexisting designs, rendering it especially suitable for forming operations.

<FIG> is a section view of multi-tool assembly <NUM> in an active configuration. As shown, forming punch tool <NUM> has been moved downward, away from guide body <NUM> in the direction of the arrows, positioning the tool for operation on a workpiece. By contrast, forming punch tool <NUM> remains in the inactive position, closer to guide body <NUM>. Movement of forming punch tool <NUM> can be effected via selective rotation of striker body <NUM>, such that striker ram <NUM> contacts punch driver <NUM> and pushes it toward punch tool <NUM>. As noted on the figure, there may be no gap between striker ram <NUM> and punch driver <NUM>. In some examples, a gear mechanism forces striker cap <NUM> downward during a punching operation. To return forming punch tool <NUM> to its inactive position, striker body <NUM> can be rotated again, for example such that striker ram <NUM> is positioned above punch tool <NUM>, thereby causing punch tool <NUM> to extend away from guide body <NUM> and into its operational position. Punch driver <NUM> may comprise a unitary, one-piece body. In another embodiment, the upper assembly, holding the set of forming punches, could utilize a multi-tool suitable for a punching sheet material, or a similar design; e.g., where the upper assembly is adapted for holding a set of forming punches matched to a die set of a die carrier assembly.

<FIG> is an isometric view of multi-die carrier assembly <NUM> containing no dies. Without the dies installed, the die bores <NUM>, <NUM>, <NUM> configured to receive the dies are plainly visible. The die bores <NUM>, <NUM>, <NUM> shown in this example are cylindrical, but the shape may vary in other embodiments as necessary to accommodate differently shaped dies.

<FIG> is a plan view of multi-die carrier assembly <NUM>, showing a top surface of all three forming dies <NUM>, <NUM>, <NUM> installed. Preexisting multi-tool assemblies typically do not employ multiple forming dies because the non-selected dies would interfere with the workpiece or induce undesired forms on the material.

<FIG> is a section view of multi-die carrier assembly <NUM> taken along line B-B of <FIG>, such that cam base <NUM> is shown positioned below die locator component <NUM>. Die <NUM> is shown including an internal, circumferential bias member or spring <NUM>; e.g., a Belleville spring or similar bias component configured to reduce the stripping force within each die, and forming portion <NUM>. A portion of forming die <NUM> is also shown, including internal bias member or spring <NUM>, which may also reduce a stripping force of the die.

<FIG> is another section view of multi-die carrier assembly <NUM>, showing forming die <NUM> and lock pin <NUM>, which is coupled with vertical pin <NUM>. Because lock pin <NUM> is coupled with vertical pin <NUM>, lateral movement of lock pin <NUM> also causes lateral movement of vertical pin <NUM>. In the locked configuration shown in <FIG>, vertical pin <NUM> is resting within a complementary groove or key slot <NUM> defined by cam base <NUM>, thereby securing die locator component <NUM> to cam base <NUM>. Sliding lock pin <NUM> into the body of die locator component <NUM> compresses an internal spring <NUM>. Release of lock pin <NUM> allows spring <NUM> to expand back to its resting state, moving in an outward direction with respect to die locator component <NUM>. In this manner, lock pin <NUM> may be biased toward the locked position, such that cam base <NUM> is not allowed to rotate freely without actuation, which may be driven by a press apparatus or component thereof in some examples.

As further shown, cam base <NUM> can define one or more bores, such as central bore <NUM> and lower through-bore <NUM>. Central bore <NUM>, which can be optional, can be configured to collect debris, such as metal shards, that are often created during punching operations. Lower through-bore <NUM> can receive a die extension or protrusion, which may be defined by some die members, such as die members configured to move downward, within the bore, in response to a downward force applied by a complementary punch tool. The lower through-bore <NUM> can also allow the ejection of sheet material, as might occur in combination with pierce-and-form tool sets. As further shown, cam base <NUM> may define an internal cam ramp <NUM> configured to elevate and/or support individual dies, such as die <NUM> in the configuration shown.

<FIG> is an isometric view of cam base <NUM> showing cam ramp <NUM>, which resembles a plateau shape comprised of two opposing ramped surfaces <NUM> flanking a central flat portion <NUM> in this example. The cam ramp <NUM> rotates with rotation of the cam base <NUM>, providing the structure necessary to elevate an individual die from below while the remaining dies not positioned above cam ramp <NUM> are allowed to remain in or drop down to a lowered position, away from the workpiece, such that the lowered dies do not interfere with a punching operation until selectively raised by cam ramp <NUM>. Cam ramp <NUM> can be rotated by an indexing mechanism of a CNC punch press, for example, while a shot pin or other holding member holds die locator component <NUM> stationary, such that die locator component <NUM> captures the dies in their radial, or x-y position, while cam ramp <NUM> operates to displace and/or support one of the dies vertically, raising it to or holding it at a useful position for sheet material forming. In other embodiments, the cam base <NUM> can remain stationary, thus serving as the stator component in the assembly, and the die locator component <NUM> can be rotatable, such as depicted in <FIG>. Cam ramp <NUM> can support one die rigidly while the other die or dies are allowed to lower if impinged on sufficiently to overcome a resilient, frictional, or elastic means holding or biasing the non-selected dies in an upper position. Accordingly, the selected die is supported by cam ramp <NUM> so as to be secured sufficiently for material forming, while the other die or dies are only resiliently or frictionally supported. Other rotatable or stationary selectors can be utilized in embodiments described herein.

<FIG> is another section view of multi-die carrier assembly <NUM> in the locked configuration. As shown, lock pin <NUM> has not been slid laterally inward, such that spring <NUM> remains uncompressed. Consequently, vertical pin <NUM> remains engaged with key slot <NUM> defined by cam base <NUM>, thereby locking cam base <NUM> to the upper die locator component <NUM> and preventing rotation of the cam base relative to the die locator component. Lock pin <NUM> can be actuated by a pin member, e.g., a shot pin, of a press apparatus to release the internal locking mechanisms of assembly <NUM>, which effects holding of the upper part, so as to become a die locator, while the press can use an auto-index mechanism, or similar means to rotate the lower cam base. Central bore <NUM> and lower through-bore <NUM> are also visible. Above each bore, sandwiched between cam base <NUM> and die locator component <NUM> lies two die shoes <NUM>, <NUM>. Die shoes <NUM>, <NUM> may be optionally included, and as shown in <FIG>, may define elongate, flat disc-like components positioned underneath each die. Vertical springs <NUM>, <NUM> may be configured to exert a downward biasing force on the die shoes, holding them in place during working operations and movement of cam ramp <NUM>, such that each die shoe may remain below the same die regardless of cam base configuration. Thus, in various embodiments, cam ramp <NUM> may operate directly on the dies, or on die shoes positioned between the dies and the cam ramp. Die bore <NUM> is also shown formed into die locator component <NUM>. Die bore <NUM> is configured to receive and hold various forming dies, some of which may include a downward extension or protrusion, which may extend into lower die bore <NUM>. In some examples, a die sleeve can be included to operate as an intermediate component between a die and a die locating cassette. Various combinations of die shoe and die sleeve are possible.

<FIG> is a section view of multi-die carrier assembly <NUM> in an unlocked configuration. Lock pin <NUM> has been slid laterally inward, along with vertical pin <NUM>, thereby compressing spring <NUM> and vacating key slot <NUM>. Movement of vertical pin <NUM> out of key slot <NUM> disengages die locator component <NUM> from cam base <NUM>, such that cam base <NUM> may be rotated relative to the die locator component <NUM>, which may remain stationary. As cam base <NUM> rotates, cam ramp <NUM> defined by the cam base also rotates until positioned beneath a die desired for a specific operation. Key slot <NUM> can be keyed into a turret press upon which carrier assembly <NUM> is mounted. The turret press can thus activate rotation of cam base <NUM> via engagement with key slot <NUM>.

<FIG> is a section view of multi-die carrier assembly <NUM> mounted on a press apparatus <NUM>, e.g., turret press, in a locked configuration. As shown, press apparatus <NUM> may comprise a shot pin <NUM>, which is aligned with lock pin <NUM>. Shot pin <NUM> can be configured to slide laterally toward and away from lock pin <NUM>. At the snapshot depicted, shot pin <NUM> is positioned in a retracted position, laterally separated from an outer end of lock pin <NUM>.

<FIG> is a section view of multi-die carrier assembly <NUM> and press apparatus <NUM> in an unlocked configuration. Shot pin <NUM> has been extended laterally by the press, such that it contacts and pushes lock pin <NUM> inward within the body of die locator component <NUM>. Movement of lock pin <NUM> in response to movement of shot pin <NUM> causes lateral displacement of vertical pin <NUM> out of key slot <NUM>, thus allowing cam base <NUM> to be rotated under the control of the press (and the operator of the press). Accordingly, multi-die carrier assembly <NUM> can be manipulable by automated press actuation to raise one selected die up to a useful working position, e.g., at or near a workpiece, while the other die or dies included in the assembly may remain substantially lower and away from the workpiece.

<FIG> is an isometric view of multi-die carrier assembly <NUM> and press apparatus <NUM>. In the configuration shown, shot pin <NUM> has been extended within assembly <NUM>, where an outer end of the shot pin contacts lock pin <NUM>. In this configuration, forming die <NUM> is elevated by the internal cam ramp defined by cam base <NUM>. The cam or die displacement element can also facilitate a configuration with some of the dies down, or otherwise held in place, for example with a selected die of the set of installed set of dies being raised for forming use. All of the dies could also be deselected, or in the down or fixed position, for example to prevent damage to the workpiece from a raised die, when punching or forming with an adjacent or nearby turret station.

<FIG> is an isometric view of multi-die carrier assembly <NUM> and press apparatus <NUM> after rotation of cam base <NUM> by about <NUM>°. By rotating cam base <NUM> (and the cam ramp defined by the base), forming die <NUM> has been elevated, and forming die <NUM> allowed to drop back down away from a workpiece. In various embodiments, non-selected forming dies, such as die <NUM>, are allowed to lower if impinged on sufficiently to overcome a resilient, frictional, or elastic means holding the non-selected dies in an upper, operational position.

The example multi-tool assemblies described above are each configured with three tool sets or workstations and utilize a rotating cam to select a specific punch tool or die. It should be understood that similar multi-tools could be constructed holding <NUM>, <NUM>, <NUM>, or any number of tool sets, as mentioned. In addition, various means may be employed for selectively displacing individual tools or dies for a specific working operation, in addition to or instead of the camming mechanism effected by cam base <NUM>. For example, a sliding puck, bistable latch, or other means could be used to hold one selected die in place, as described below with reference to <FIG>. There are other variations to the configuration, means, and methods described herein which will be obvious to anyone skilled in the art.

<FIG> is a plan view of forming die <NUM> and a slidable puck <NUM> positioned adjacent to the die. Slidable puck <NUM> is configured to elevate forming die <NUM> responsive to movement caused by a shot pin <NUM>. In particular, slidable puck <NUM> defines three ramped surfaces <NUM>a-c each configured to exert a camming action directly on a selected die, or an intermediate member, to raise the selected die, for example until the die rests on top of slidable puck <NUM>, while the other die or dies remain in, or descend to, a lowered position. In some examples, non-selected dies may remain resiliently or frictionally supported, thereby rendering them moveable to a lowered position in response to gravitational and/or physical force. Each ramped surface can be positioned adjacent to a specific forming die. In the example shown, ramped surface <NUM>a is positioned adjacent to forming die <NUM>. Opposite each ramped surface <NUM>a-c, a contact surface <NUM>a-c is defined by slidable puck <NUM>. Separate shot pins can contact each of the contact surfaces upon lateral movement of the shot pins, thereby moving slidable puck <NUM> in the direction of shot pin movement and causing one of the three ramped surfaces to move under, and elevate, the adjacent forming die via a camming mechanism. In the configuration shown, shot pin <NUM> is positioned to slide laterally against contact surface <NUM>a, causing ramped surface <NUM>a to slide under forming die <NUM>, thereby elevating forming die <NUM> into an operational position against a workpiece. As further shown, slidable puck <NUM> may also define a central bore <NUM> for debris collection and lateral movement of the puck may be constrained by a die base.

<FIG> is a side view of the forming die <NUM>, slidable puck <NUM> and shot pin <NUM>. Shot pin <NUM> can move laterally in the directions of the bidirectional arrow. A bottom surface of slidable puck <NUM> may be positioned slightly beneath a bottom surface of forming die <NUM>, such that ramped surface <NUM>a can be wedged underneath the forming die upon lateral movement of the puck toward the die.

<FIG> is an isometric view of forming die <NUM>, slidable puck <NUM> and shot pin <NUM>. As indicated, slidable puck <NUM> can be slid in the direction of the arrow by contacting surface 252b with a shot pin. In this manner, a different forming die can be selected for elevation, while non-selected forming die <NUM> is lowered away from the workpiece.

<FIG> is a section view of a multi-die carrier assembly <NUM> having a bistable mechanism configured for selectively raising and lowering forming dies included in the assembly, such as forming die 258a. Assembly <NUM> includes a bistable push-pin 260a configured to slide within the multi-die carrier assembly <NUM> upon receiving a force, which may be manual or mechanical, e.g., via a press operation. As further described herein, push-pin 260a may include an internal guideway defined by an internal cam latch member in some examples. Push-pin 260a is coupled at one end to a bias member, e.g., spring <NUM>, which urges or biases the push-pin 260a upward (in the orientation depicted) into a first position. Another bias member, such as die spring <NUM>, is included to bias die 258a toward an upward position. The force of die spring <NUM> may be relatively weak and less than the weight of a workpiece, thereby allowing depression or downward movement of die 258a in response to placement of a workpiece thereon. While push-pin 260a is included in the example shown in <FIG>, other bistable members can be utilized.

In operation, push-pin 260a can be depressed manually or via a punch tool, sliding deeper into assembly <NUM>. Downward movement or depression of push-pin 260a may cause lateral movement of a slidable member <NUM> against the spring force of another bias member, e.g., spring <NUM>, compression of which may be limited by a stop member, e.g., pin <NUM>. Pushing downward on push-pin 260a a first time can maintain forming die 258a in an inactive, non-operational lower position, away from a workpiece. Without slidable member <NUM> positioned beneath forming die 258a, the weight and/or pressure of a workpiece positioned above the die can overcome the biasing force applied by die spring <NUM> that is necessary to maintain the die in an upward position, thereby compelling or allowing the die to move downward, away from the workpiece. Pushing downward on push-pin 260a a second time can lock forming die 258a in an upper position for engagement with a workpiece by moving slidable member <NUM> under the die, as shown in <FIG>.

<FIG> is a section view of multi-die carrier assembly <NUM> in a second configuration after depression of push-pin 260a and compression of spring <NUM> a second time. As shown, slidable member <NUM> has moved laterally in response to the downward movement of push-pin 260a, such that a portion of slidable member <NUM> is now positioned underneath forming die 258a, thereby preventing compression of a bias member, e.g., die spring <NUM>, positioned underneath forming die 258a and locking the die in an upper, active position for engagement on a workpiece. Spring <NUM> has also been compressed against pin <NUM>.

<FIG> is an isometric view of push-pin 260a, showing a guideway <NUM> and a cam latch member <NUM>. A pocket <NUM> is also shown, along with an interface <NUM> configured to receive a force in the direction of the arrow to effect locking and unlocking of an operatively coupled forming die into active and inactive configurations. Slanted surface <NUM> is configured to slide against a complementary surface defined by slidable member <NUM> during actuation of push-pin 260a. A locking member can also be coupled with push-pin 260a and may include a lateral protrusion confined to the guideway. In some examples, a lateral protrusion defined by a locking member may rest in pocket <NUM> defined by cam latch member <NUM>, thereby locking push-pin 260a in a locked configuration until it is depressed again at interface <NUM>. The locking member can also be coupled with slidable member <NUM>. Depression of push-pin 260a may cause a lateral protrusion of the locking member to be repositioned within guideway <NUM>.

<FIG> is an isometric view of slidable member <NUM>. As shown, slidable member <NUM> can define a lateral aperture <NUM> and a slanted surface <NUM> that is complementary to the slanted surface <NUM> defined by push-pin 260a. Lateral aperture <NUM> may house spring <NUM> and pin <NUM>.

<FIG> is an isometric view of multi-die carrier assembly <NUM> that includes four forming dies <NUM>a-<NUM>d each coupled with a respective push-pin <NUM>a-<NUM>d. Due to the independent coupling between each push-pin-forming die pair, the forming dies can be selectively activated one-by-one for operation on a workpiece.

<FIG> is an isometric view of a multi-die carrier assembly <NUM> comprising latch mechanisms for individual die selection. Die carrier assembly <NUM> defines four die bores <NUM>a-d, each configured to receive a movable forming die therein. Each forming die can be raised by one or more springs positioned beneath each die. After raising a die via the spring(s), a shelf-like component or latch <NUM>a, b, c or d can be slid underneath the die, holding the die at an elevated position for operation on a workpiece. In this manner, individual die selection is effected by sliding a latch under its respective die. One or more latches may be moveable in response to manually or mechanically applied forces, e.g., via a press operation.

<FIG> is a partially cut-away isometric view showing internal components of a multi-die carrier assembly <NUM> configured to selectively actuate individual forming dies using a machine fork component in conjunction with a cam ramp. Not shown for clarity is the die locator component <NUM> of <FIG>, which holds the dies and facilitates rotation thereof. Selective die actuation may be facilitated by both stationary and rotatable components in the embodiment shown. Rotatable components of die carrier assembly <NUM> can include one or more forming dies, such as dies <NUM>, <NUM> and <NUM>, each of which may be set in a respective die sleeve <NUM>, <NUM>, <NUM>. Stationary components coupled with the dies <NUM>, <NUM>, <NUM> can include a plate <NUM>, which includes a cam ramp <NUM> configured to elevate individual dies upon die locator component rotation, and a sub-plate <NUM> integrally formed with or affixed to a base <NUM>. A plurality of fasteners <NUM>, e.g., socket head screws, can also be included to mount die assembly <NUM> to a platform or work surface.

In operation, dies <NUM>, <NUM>, <NUM> can be configured to rotate within plate <NUM> and over cam ramp <NUM>, such that one of the dies may be elevated by cam ramp <NUM> at any given point in time. In some embodiments, such as shown in <FIG>, cam ramp <NUM> may be sized to fit between any two dies, such that if desired by an operator, none of the dies are elevated at a given point in time. Rotation of the die locator component may be driven by a mechanical rotator, such as the machine fork <NUM> shown in <FIG>.

<FIG> is a section view of die carrier assembly <NUM>, showing die <NUM> raised to an elevated operating position, where it may contact and form a workpiece. Die <NUM> is positioned above a die shoe <NUM> and partially within die sleeve <NUM>. As further shown, an interior portion of plate <NUM> defines cam ramp <NUM>, which may define one or more slanted surfaces configured to wedge beneath each die upon rotation thereof. A die locator component <NUM> coupled with plate <NUM> may conceal the majority of each die, such that only an upper portion of each die is visible. In the configuration shown, die <NUM> remains elevated in an operating position atop cam ramp <NUM>, such that a greater portion of die <NUM> is visible relative to die <NUM>, which along with die <NUM>, remains retracted in a non-operational, or resting, position. Each die is further supported by a centrally-positioned, rotatable driver <NUM>, which may be configured to rotate in response to rotation of a mechanical rotator.

<FIG> is a section view of die carrier assembly <NUM> after rotation of the dies, such that die <NUM> is now positioned on the right-hand side of the illustration. As shown, die shoe <NUM> and die sleeve <NUM> have both been repositioned via rotation, while plate <NUM> and cam ramp <NUM> remain stationary. In this specific configuration, none of the dies have been positioned over cam ramp <NUM>, such that each die is in a retracted, non-operational position. Rotation of the dies can be driven by mechanical rotation of machine fork <NUM>, which comprises at least one protrusion, prong or fork, such as fork <NUM> and fork <NUM>. Each fork <NUM>, <NUM> can be configured for slidable insertion within a respective slot <NUM>, <NUM> defined by or coupled with rotatable driver <NUM>. Accordingly, rotation of machine fork <NUM> may drive rotation of driver <NUM> and dies <NUM>, <NUM>, <NUM> supported thereon. Movement of machine fork <NUM> may be effected by various components, such as a machine belt or mechanical gear system.

<FIG> is an isometric view of die sleeve <NUM>, which can be configured to limit the vertical mobility of a die coupled therewith. For example, die sleeve <NUM> can be configured to limit the upward movement of a die coupled therewith, such that if a workpiece adheres to an upper surface of the die, removal of the workpiece causes separation of the workpiece from the die. One or more vertical holes or slots <NUM> may be defined by die sleeve <NUM>, each vertical hole or slot configured to receive a coil spring configured to urge or compel non-selected dies in a downward direction, away from the workpiece. Die sleeve <NUM> may also include one or more horizontally positioned fasteners, e.g., set screw <NUM>, configured to couple die sleeve <NUM> with a corresponding die. A die key <NUM> may also be included with die sleeve <NUM>, the die key <NUM> configured to orient the die to which it is coupled with one of the die bores defined by a die locator component, such as die locator component <NUM>. Die sleeves may be coupled with one or more of the dies in some examples, or, in other examples, excluded entirely.

<FIG> is an isometric view of a multi-die carrier assembly <NUM> configured to selectively actuate individual dies using a machine fork component. Like multi-die carrier assembly <NUM>, multi-die carrier assembly <NUM> can include a combination of rotatable and stationary components. As shown, die carrier assembly <NUM> can include one or more rotatable forming dies, such as die <NUM>, each die housed in a respective die bore <NUM>, <NUM>, <NUM> defined by a rotatable die locator component <NUM>. Stationary components can include a plate <NUM> which includes a sub-plate <NUM> integrally formed with or affixed to a base <NUM>, which may be coupled with one or more fasteners <NUM> configured to mount die assembly <NUM> to a platform or work surface.

In operation, die bores <NUM>, <NUM>, <NUM>, and any dies mounted therein, and die locator component <NUM>, can rotate within plate <NUM>. Rotation of the die locator component <NUM> may again be driven by a separate mechanical component, such as the machine fork shown <NUM> in <FIG>, which unlike machine fork <NUM>, can be configured to rotate and lift the dies, thereby effecting selection and elevation of each die at the direction of an operator.

<FIG> is a section view of multi-die carrier assembly <NUM>, showing die <NUM> in a retracted, non-operational position. As shown, die locator component <NUM> can define a slot or hole <NUM> configured to receive a carrier pin <NUM>, which moves vertically within the hole or slot in response to elevation and retraction of driver component <NUM>. Upward motion of driver component <NUM> drives upward movement of lift block <NUM>, thereby causing upward motion of die shoe <NUM> and die <NUM>, along with die sleeve <NUM> coupled therewith.

Elevation of die <NUM> can be limited by the size of lift gap <NUM>. In particular, driver component <NUM> may continue to elevate until an upper gap surface <NUM> of the driver component contacts a ceiling <NUM> of lift gap <NUM>. Rotation of driver component <NUM> and any dies coupled therewith can be driven by mechanical rotation of machine fork <NUM>, which comprises at least one prong or fork, such as fork <NUM> and fork <NUM>. Each fork <NUM>, <NUM> can be configured for slidable insertion within a respective slot <NUM>, <NUM> defined by or coupled with driver component <NUM>. Accordingly, rotation and elevation of machine fork <NUM> may drive rotation and elevation of driver component <NUM> and die <NUM>. Movement of machine fork <NUM> may be effected by various components, such as a machine belt or mechanical gear system.

<FIG> is an isometric view of multi-die carrier assembly <NUM> without rotatable die locator component <NUM> and any forming dies coupled therewith installed. With rotatable die locator component <NUM> removed, an upper surface of driver component <NUM> is exposed, along with carrier pins <NUM>, <NUM> and <NUM>, each of which may be pressed directly into the driver component. As driver component <NUM> rises, the carrier pins <NUM>, <NUM>, <NUM> slide vertically within respective holes or slots defined by die locator component <NUM>, thereby accommodating vertical motion of driver component <NUM> without causing vertical motion of die locator component <NUM>. Rotation of carrier pins <NUM>, <NUM>, <NUM> causes rotation of die locator component <NUM>, such that die locator component <NUM> can rotate, but not rise/fall, with driver component <NUM>. To drive vertical motion of an individual forming die without a cam ramp, lift block <NUM> is positioned in a retained pocket that confines it to vertical motion, only. When the desired forming die is rotated to the position above lift block <NUM> via driver component <NUM>, lift block <NUM> is urged upward via vertical motion of driver component <NUM>.

<FIG> is a section view of a of multi-die carrier assembly <NUM>, showing a die <NUM> in a non-elevated, non-operational position. In this particular embodiment, die sleeves are not included with the assembly <NUM>. As a result, die <NUM> can slide up and down without the additional restriction of the die sleeves. Like multi-die carrier assembly <NUM>, multi-die carrier assembly <NUM> is configured to selectively actuate individual dies using a mechanical rotator, such as machine fork <NUM>. Multi-die carrier assembly <NUM> can include a combination of rotatable and stationary components, including one or more rotatable forming dies, such as die <NUM>, each die housed in a respective die bore defined by a rotatable die locator component <NUM>. Stationary components can include a plate <NUM> which includes a sub-plate <NUM> integrally formed with or affixed to a base <NUM>, which may be coupled with one or more fasteners <NUM> configured to mount die assembly <NUM> to a platform or work surface.

In operation, die locator component <NUM> and die <NUM> can rotate within plate <NUM>. Rotation of die locator component <NUM> may be driven by a separate mechanical component, such as the machine fork shown <NUM>, which can be configured to rotate, lift and support the dies, thereby effecting selection and elevation of each die at the direction of an operator.

As further shown, die carrier <NUM> can define a slot or hole <NUM> configured to receive a carrier pin <NUM>, which moves vertically within the hole or slot in response to elevation and retraction of driver component <NUM>. Upward motion of driver component <NUM> drives upward movement of lift block <NUM>, thereby causing upward motion of die <NUM>.

Claim 1:
A multi-die carrier assembly (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) for punch forming operations, comprising:
a die carrier (<NUM>, <NUM>, <NUM>, <NUM>) configured to retain a plurality of forming dies (<NUM>, <NUM>, <NUM>, 258a, 268a-268d, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>);
a die selector (<NUM>, <NUM>, <NUM>, <NUM>), coupled with the die carrier, configured to select one of the plurality of forming dies for operation on a workpiece by retaining or elevating the selected forming die at an operational height; and
a mechanical rotator configured to rotate the die carrier (<NUM>, <NUM>, <NUM>, <NUM>) with respect to the die selector (<NUM>, <NUM>, <NUM>, <NUM>); and
wherein the die carrier (<NUM>, <NUM>, <NUM>, <NUM>) and the die selector (<NUM>, <NUM>, <NUM>, <NUM>) define complementary mating surfaces that form a slidable interface configured to accommodate relative motion between the die carrier and the die selector;
characterized in that
the die selector (<NUM>, <NUM>, <NUM>, <NUM>) defines a cam or a ramp (<NUM>, <NUM>, <NUM>, <NUM>) configured to slide beneath each of the plurality of forming dies upon the relative rotation between the die carrier and the die selector.