FORM 2
The Patents Act 1970
(39 of 1970)
&
The Patent Rules 2003
COMPLETE SPECIFICATION
(See Section 10 and rule 13)
TITLE OF THE INVENTION:
FLOATING DIE ASSEMBLY FOR PRESS
TOOLS
APPLICANT:
LARSEN & TOUBRO LIMITED
L&T House, Ballard Estate, P.O. Box No. 278,
Mumbai, 400 001, Maharashtra
INDIA.
PREAMBLE OF THE DESCRIPTION:
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED

A) TECHNICAL FIELD
[0001] The present invention generally relates to a press tool assembly and
particularly to the press tools used for processing coils/strips in progressive punching operations that are executed during the manufacturing process of sheet metal components used in applications such as electrical/electronic products, automobiles, watches etc. The present invention more particularly relates to a floating die arrangement in the bottom half of the press tool to support the bending operations and to facilitate the smooth feeding of coil/ strip inside the press tool.
B) BACKGROUND OF THE INVENTION
[0002] Press working is one of the major processing techniques for
converting a sheet metal into the sheet metal parts of different shapes. The sheet metal parts are required for different applications such as electrical/ electronic products, automobiles, watches etc. The sheet metal is punched between two parts called punch and die. The die profile is the female profile intentionally kept bigger than the punch profile by a uniform gap called cutting clearance.
[0003] The press tool mainly consists of two halves, namely fixed bottom
half and moving top half. The fixed bottom half is secured to the stationary bolster plate of mechanical press. The bottom half comprises an arrangement to guide the strip/coil, die cavities, guide pillars for alignment of both halves etc. The top moving half is clamped to the moving ram of the mechanical press and it comprises a number of circular and non circular cutting and non cutting elements called punches. The punches move up and down along with the moving ram of the mechanical press and they are guided in cavities made in a plate called Stripper plate. During the downward movement, the punches penetrate the sheet metal and enter the die cavity thereby pushing the sheet metal scrap displaced by the cutting punch into the lower half of the tool. One downward and return upward movement of the top half of press

tool is called as a stroke of press tool. The surrounding metal clings to the body of cutting punches during the downward stroke. The same is stripped off by the stripper plate during the upward stroke of the punches.
[0004] Press tool may be of multi-station type (progressive) or single station
type. In a multi-station tool, the strip moves from one end of strip guides to the other end. It moves progressively by a fixed distance called "pitch" after every stroke of the mechanical press. At each stage of movement of strip, different punching operations are carried out on strip / coil leading to completion of stamping profile in last stage.
[0005] Separate die inserts and die buttons are provided in the main die plate
for individual operations like piercing, notching, lancing, flaring, bending etc. The die inserts are either kept projecting above the die level or are kept below the die level for performing these operations in progressive dies. So strip /coil are to be lifted to a certain height (above the die inserts or to the height to bring bent/flared/formed regions to above the die surface). Otherwise the die inserts and the bent/flared/formed features which are a part of the coil/strip will become an obstruction for further feeding/pitching. So sufficient number of spring loaded strip/coil lifters are provided to lift the strip/coil all over the feeding region, to facilitate the coil/strip advancement or pitching or feeding.
[0006] Sometimes components (Strip/coil) have multiple bends or features
like flanged holes (flared holes) or formed areas. These operations are normally completed before bending operation. After bending operation (normally 90°), these regions (which are formed/flared/bent earlier) becomes an obstruction for strip lifting and further advancement of strip/coil.
[0007] In the currently available press tools, the multiple bends are done with
the help of side cams which acts from the sides. The removal of slug after flaring operation has become a problem in this construction. Also the maintenance and

assembly of side cam and bending elements from the sides is difficult. The tool construction and tool assembly is also very difficult.
[0008] When the required quantity is less, similar components are produced
in stage tooling. Separate tools for Blanking and bending operations are used. In stage tooling, the component removal after final bending is also difficult.
[0009] Hence there is a need to provide a system and method for providing
an arrangement to lift the die inserts to lift the strips to facilitate smooth feeding of coil/strip and tooling operations in the press tool.
[0010] The abovementioned shortcomings, disadvantages and problems are
addressed herein and which will be understood by reading and studying the following specification. C) OBJECTS OF THE INVENTION
[0011] The primary object of the present invention is to develop and provide
a floating die assembly for a press tool in the bottom half of the progressive press tool to feed the coil/strip smoothly and to support the bending operations.
[0012] Another object of the present invention is to develop a floating die
assembly for a press tool to lift the coil/strip positively up-to the lifting height in the progressive press tool.
[0013] Yet another object of the present invention is to develop a floating die
assembly for a press tool to handle a coil/strip which is also punched with in such a manner that the punched or flared strip/coil is not disturbed/ damaged during the further working process/punching operations.
[0014] Yet another object of the present invention is to develop an
arrangement for aligning of strips/coils in a progressive press tool at one or more

locations and according to the requirement so as to get constant reference for punching holes.
[0015] Yet another object of the present invention is to develop a floating die
assembly which is assembled and serviced easily.
[0016] Yet another object of the present invention is to develop a floating die
assembly in which the spring load and the movement is adjusted based on the requirement.
[0017] These and other objects and advantages of the present invention will
become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.
D) SUMMARY OF THE INVENTION
[0018] The various embodiments of the present invention provide an
arrangement for lifting the coil/strip in progressive press tools. According to one embodiment of the present invention, a floating die assembly is provided for press tools including a die block. The assembly has atleast one die insert guided in a die block at a press tool. A spring is arranged below the die insert. A sleeve is provided below the die insert. An Allen screw is inserted through the sleeve and clamped to the die insert. A washer is provided between the Allen screw and the sleeve.
[0019] The die insert is provided with relief slots and the die insert is
projected up above a die surface in the press tool to the lifting height of a strip or coil with the help of the spring. The relief slots are formed on both the side surfaces of the die insert along the height direction to receive a bend which is formed in the strip or coil during a previous operation. The relief slots are made as open channel along the feeding direction.

[0020] The spring is housed inside a packet provided in a backing plate and a
base plate that are provided in the press tool. The spring is in pre compressed condition during the downward stroke of a press in the press tool to push the die insert above the die surface upto the strip lifting height. The spring is in compressed condition, when the die insert is pushed down during the downward stroke of the press. The spring is selected based on the required stroke length of the press and the load.
[0021] The washer is arranged below the sleeve to provide a resting surface
for both the Allen screw and the sleeve. The washer acts as a stopper during the upward movement of the press, when the washer is in contact with a bottom surface of the backing plate. The length of the sleeve is designed based on the required movement of the die insert and the spring load.
[0022] According to one embodiment of the present invention, the press tool
includes floating die inserts which may be rectangular in shape or may be of other required shape according to the features. These are precisely guided in the die block which is fastened to the base plate. Further a spring is provided below the die insert where the spring is in the pre-compressed condition during the upward stroke condition of the press. The die inserts projects above the die surface up to the lifting height of the strip/coil. A sleeve, washer and Allen screw assembly is fastened below the die insert which acts as a stopper for the upward movement of die insert. Step on the sides of the die insert can also be used as a stopping surface.
[0023] The strip/coil is fed above the top surface of the die insert. During the
downward stroke of the press, the wear plate/stripper holds the strip/coil from the top. The further downward movement of the top half of the press pushes the die insert down and the bottom surface of the die insert touches the backing plate. This restricts the further downward movement of the die insert. The spring below the die insert is in the compressed stage at this time. Also at this particular time the top

surface of the die insert is flush with the top of the die surface. During the remaining stroke of the press, the stripper rests above the die plate and the stripper springs comes into action and starts compressing. Thus the punches come below and complete the bending operation. The areas which are formed/bend/flared in the previous stages goes inside the relief slot in the die insert.
[0024] During the upward stroke the top half of the press tool moves up. The
compressed spring below the die insert pushes the die insert upward and it is taken up to the lifting height of the lifter pins. The strip/coil is advanced forward before the next stroke. The areas which are formed/bend/flared in the previous stages are easily taken out of the die insert in the feeding direction during feeding.
E) BRIEF DESCRIPTION OF THE DRAWINGS:
[0025] The other objects, features and advantages will occur to those skilled
in the art from the following description of the preferred embodiment and the accompanying drawings in which:
[0026] FIG. 1 illustrates a sectional view of the floating die insert assembly
in a press tool assembly according to one embodiment of the present invention.
[0027] FIG. 2 illustrates an enlarged sectional view of the floating die insert
assembly in a press tool assembly according to one embodiment of the present invention.
[0028] FIG. 3 illustrates an enlarged sectional and top views of the die insert
in a floating die insert assembly in a press tool assembly according to one embodiment of the present invention.

[0029] FIG. 4 illustrates a sectional side view of a sleeve in a floating die
insert assembly in a press tool assembly according to one embodiment of the present invention.
[0030] FIG. 5 illustrates a sectional view of a floating die insert assembly in a
press tool assembly, showing the positions and conditions of various elements during the upward stroke condition of the press tool, according to one embodiment of the present invention.
[0031 ] FIG. 6 illustrates a sectional view of a floating die insert assembly in a
press tool assembly, showing the top half of the progressive press tool during the downward stroke condition of the press tool, according to one embodiment of the present invention.
[0032] FIG. 7 illustrates a sectional view of a floating die insert assembly in a
press tool assembly showing the top half of the press tool during the downward stroke condition of the press tool, when the wear plate and stripper plate pushes the coil/strip with the die insert in the downward direction, according to one embodiment of the present invention.
[0033] FIG. 8 illustrates a sectional view of a floating die insert assembly in a
press tool assembly showing the fully downward stroke of the press tool, when the stripper spring is compressed during the further downward movement and the bending punches take the downward stroke to bend the strip / coil against the die insert according to one embodiment of the present invention.
[0034] FIG. 9 illustrates a sectional view of a floating die insert assembly in a
press tool assembly showing upward stroke of the progressive press tool when the strip/coil is lifted to the strip lifting height and the die insert is also taken upward by the compression spring, according to one embodiment of the present invention.

[0035] Although specific features of the present invention are shown in some
drawings and not in others. This is done for convenience only as each feature may be combined with any or all of the other features in accordance with the present invention.
F) DETAILED DESCRIPTION OF THE INVENTION
[0036] In the following detailed description, reference is made to the
accompanying drawings that form a part hereof, and in which the specific embodiments that may be practiced is shown by way of illustration. These embodiments are described in sufficient detail to enable those skilled in the art to practice the embodiments and it is to be understood that the logical, mechanical and other changes may be made without departing from the scope of the embodiments. The following detailed description is therefore not to be taken in a limiting sense.
[0037] The various embodiments of the present invention provide an
arrangement for lifting the coil/strip in progressive press tools. According to one embodiment of the present invention, a floating die assembly is provided for press tools including a die block. The assembly has atleast one die insert guided in a die block at a press tool. A spring is arranged below the die insert. A sleeve is provided below the die insert. An Allen screw is inserted through the sleeve and clamped to the die insert. A washer is provided between the Allen screw and the sleeve.
[0038] The die insert is provided with relief slots and the die insert is
projected up above a die surface in the press tool to the lifting height of a strip or coil with the help of the spring. The relief slots are formed on both the side surfaces of the die insert along the height direction to receive a bend which is formed in the strip or coil during a previous operation. The relief slots are made as open channel along the feeding direction.

[0039] The spring is housed inside a packet provided in a backing plate and a
base plate that are provided in the press tool. The spring is in pre compressed condition during the downward stroke of a press in the press tool to push the die insert above the die surface upto the strip lifting height. The spring is in compressed condition, when the die insert is pushed down during the downward stroke of the press. The spring is selected based on the required stroke length of the press and the load.
[0040] The washer is arranged below the sleeve to provide a resting surface
for both the Allen screw and the sleeve. The washer acts as a stopper during the upward movement of the press, when the washer is in contact with a bottom surface of the backing plate. The length of the sleeve is designed based on the required movement of the die insert and the spring load.
[0041] According to one embodiment of the present invention, the press tool
includes floating die inserts which may be rectangular in shape or may be of other required shape according to the features. These are precisely guided in the die block which is fastened to the base plate. Further a spring is provided below the die insert where the spring is in the pre-compressed condition during the upward stroke condition of the press. The die inserts projects up above the die surface up to the lifting height of the strip/coil. A sleeve, washer and Allen screw assembly is fastened below the die insert which acts as a stopper for the upward movement of die insert. Step on the sides of the die insert can also be used as a stopping surface.
[0042] The strip/coil is fed above the top surface of the die insert. During the
downward stroke of the press, the wear plate/stripper holds the strip/coil from the top. The further downward movement of the top half of the press pushes the die insert down and the bottom surface of the die insert touches the backing plate. This restricts the further downward movement of the die insert. The spring below the die insert is in the compressed stage at this time. Also at this particular time the top

surface of the die insert is flush with the top of the die surface. During the remaining stroke of the press the stripper rests above the die plate and the stripper springs comes into action and starts compressing. Thus the punches come below and complete the bending operation. The areas which are formed/bend/flared in the previous stages goes inside the relief slot in the die insert.
[0043] During the upward stroke, the top half of the press tool moves up. The
compressed spring below the die insert pushes the die insert upward and it is taken up to the lifting height of the lifter pins. The strip/coil is advanced forward before the next stroke. The areas which are formed/bend/flared in the previous stages are easily taken out of the die insert in the feeding direction during feeding.
[0044] The claimed assembly consists of die insert, spring, washer and
sleeve. The die inserts may be rectangular in shape or may be of other desired shape according to the features and the area available in the tool. These are precisely guided in the die block which is fastened to the base plate. The die inserts projects up above the die surface up to the lifting height of the strip/coil with the help of a compression spring provided below the die insert. Relief slots for the previously completed operations (like forming, bending, flaring etc) are provided in the die insert. These relief slots are made open as a channel along the feeding direction.
[0045] Further the spring is housed inside the pocket provided in the backing
plate and base plate which is below the die insert. During the upward stroke condition, the spring comes to the pre compressed stage and pushes the die insert above the die level up to the strip lifting height. During the downward stroke condition, the spring comes to the compressed stage, when the die insert is pushed down by the top half. The spring is selected according to the stroke and load required. Further the sleeve is provided between the washer and the die insert through the backing plate with an Allen screw which is inserted through the sleeve and is clamped to the die insert. The length of the sleeve is maintained based on the travel required for the die insert and the spring selected. Washer is further provided

between the Allen screw and sleeve where the provided washer ensures proper resting surface for both Allen screw and sleeve.
[0046] During the upward stroke condition of the press, the die inserts
projects above the die surface up to the lifting height of the strip/coil. The strip/coil is fed above the top surface of the die insert that is the strip/coil is lifted by the strip lifting pins and the floating die insert during the upward stroke of the press tool. The spring comes to the pre-compressed state and the further upward movement of the die insert is stopped when the washer comes in contact with the bottom surface of the backing plate. Feeding of the strip/coil is done at this condition/state.
[0047] During the downward stroke of the progressive press tool the wear
plate/stripper holds the strip/coil from the top. The further downward movement of the top half of the progressive press tool pushes the die insert down and the bottom surface of the die insert touches the backing plate. This restricts the further downward movement of the die insert. The spring below the die insert is in the compressed stage at this particular time. Also the top surface of the die insert is flush with the top of the die surface at this particular time. During the remaining stroke of the press, the stripper rests above the die plate and the stripper springs comes into action and starts compressing. Thus the punches come below and complete the bending operation. The areas which are formed/bend/flared in the previous stages goes inside the relief slot in the die insert. Hence completing the bending operation.
[0048] Further during the upward stroke, the top half of the progressive press
tool moves up. The compressed spring below the die insert pushes the die insert upward and it is taken up to the lifting height of the lifter pins. The strip is advanced forward before the next stroke. The areas which are formed/bend/flared in the previous stages are easily taken out of the die insert in the feeding direction during feeding. Hence the finished component is either parted out or blanked out of the strip in the subsequent progressive operations.

[0049] FIG. 1 illustrates a sectional view of the floating die insert assembly
in a press tool assembly according to one embodiment of the present invention. With respect to FIG. 1, the progressive press tool constitutes of a floating die insert (5) which may be of any shape according to the requirements. These are precisely guided in the die block (6) and fastened to the base plate (11). A spring (7) is provided below the die insert (5). The spring (7) is in the pre-compressed state during the upward stroke of the press tool. The die insert(5) usually projects above the die surface up to the lifting height of the strip/coil where a sleeve (10), washer (9) and Allen screw (8) assembly which is fastened below the die insert(5) acts as a stopper for the upward movement of the die insert(5).
[0050] Further the strip/coil (15) is fed above the top surface of the die insert
(5). During the downward stroke of the progressive press tool the wear plate/stripper (4) holds the strip/coil (15) from the top. The further downward movement of the top half of the press pushes the die insert (5) down and the bottom surface of the die insert (5) touches the backing plate (12). This restricts the further downward movement of the die insert (5). The spring (7) below the die insert (5) is in the compressed state at this during this period. During the remaining stroke of the press the stripper rests above the die plate/ die block (6) and the stripper springs (14) comes into action and starts compressing. Thus the punches come below and complete the bending operation. The areas which are formed/ bend/ flared (1) in the previous stages goes inside the relief slot (16) in the die insert (5).
[0051] During the upward stroke of the press tool, upper half of the press
tool moves up. The compressed spring (7) below the die insert (5) pushes the die insert (5) upward and it is taken up to the lifting height of the lifter pins. The strip/coil (15) is advanced forward before the next stroke. The areas which are formed/ bend/ flared in the previous stages are easily taken out of the die insert (5) in the feeding direction. As shown in FIG.l, the top plate(2) is housed in top portion of the press tool that rests above the bending punch (13) and stripper plate(3) which is above the wear plate.

[0052] FIG. 2 illustrates an enlarged sectional view of the floating die insert
assembly in a press tool assembly according to one embodiment of the present invention. With respect to FIG. 2, the assembly consists of wear plate/ stripper plate (4) which holds strip/coil (15) component. This strip/coil consists of flared hole (1) which rests in relief slots (16) once the bending punch (13) completes the downward stroke. The strip/coil (15) component rests above the die insert (5) which is fastened to the base plate (11) by Allen screw (8), washer (9) and sleeve (10) assembly. The die insert (5) is supported by the die plate/die block (6) from either side and rests on a spring (7). Also the arrangement shows the backing plate (12) which houses spring (7), Allen screw (8), washer (9) and sleeve (10) assembly. This base plate acts as a stopper for the die insert (5) whereby limiting the movement of die-insert (5) during the upward or downward stroke.
[0053] FIG. 3 illustrates an enlarged sectional and top views of the die insert
in a floating die insert assembly in a press tool assembly according to one embodiment of the present invention. With respect to FIG. 3, the die inserts (5) is of varying shape. These are precisely guided in the die block (6) which is fastened to the base plate (11). The die inserts projects up above the die surface up to the lifting height of the strip/coil with the help of a compression spring (7) provided below the die insert (5). Relief slots (16) for the previously completed operations (like forming, bending, flaring etc) are provided in the die insert (5). These relief slots are made open as a channel along the feeding direction
[0054] FIG. 4 illustrates a sectional side view of a sleeve in a floating die
insert assembly in a press tool assembly according to one embodiment of the present
invention. With respect to FIG. 4, a sleeve (10) is provided between the washer
(9) and the die insert (5) through the backing plate (12). An Allen screw (8) is inserted through the sleeve (10) and is clamped to the die insert (5). The length of the sleeve is maintained based on the travel required for the die insert (5) and the spring

(7) selected.
[0055] FIG. 5 illustrates a sectional view of a floating die insert assembly in a
press tool assembly, showing the positions and conditions of various elements during the upward stroke condition of the press tool, according to one embodiment of the present invention. With respect to FIG.5, during the upward stroke condition of the press, the die inserts (5) projects above the die surface up to the lifting height of the strip/coil. The strip/coil (15) is fed above the top surface of the die insert (5). The spring (7) comes to the pre compressed state and the further upward movement of the die insert (5) is stopped when the washer (9) comes in contact with the bottom surface of the backing plate (12). Feeding of the strip/coil is done at this condition.
[0056] FIG. 6 illustrates a sectional view of a floating die insert assembly in a
press tool assembly, showing the top half of the progressive press tool during the downward stroke condition of the press tool, according to one embodiment of the present invention. With respect to FIG. 6, during the downward stroke of the press, the wear plate/stripper (4) holds the strip/coil (5) from the top. The further downward movement of the top half of the press pushes the die insert (5) down and the bottom surface of the die insert touches the backing plate (12). This restricts the further downward movement of the die insert (5). The spring (7) below the die insert (5) is in the compressed stage at this time. The top surface of the die insert (5) is flush with the top of the die surface during this period. During the remaining stroke of the press the stripper (4) rests above the die plate (6) and the stripper springs (14) comes into action and starts compressing. Thus the punches come below and complete the bending operation. The areas which are formed/bend/flared in the previous stages goes inside the relief slot (16) in the die insert. This completes the bending operation.
[0057] FIG. 7 illustrates a sectional view of a floating die insert assembly in a
press tool assembly showing the top half of the press tool during the downward stroke condition of the press tool, when the wear plate and stripper plate pushes the

coil/strip with the die insert in the downward direction, according to one embodiment of the present invention. With respect to FIG. 7, the wear plate (4) and stripper plate (3) pushes the coil/strip (15) with the die insert (5) in the downward direction according to one embodiment of the present invention. Here the wear plate (4) and stripper plate (3) pushes the coil/strip (15) and the die insert (5) downward. The coil/strip (15) is made resting on the die plate (6) and the downward movement of the die insert (5) is complete.
[0058] FIG. 8 illustrates a sectional view of a floating die insert assembly in a
press tool assembly showing the fully downward stroke of the press tool, when the
stripper spring is compressed during the further downward movement and the
bending punches take the downward stroke to bend the strip / coil against the die
insert according to one embodiment of the present invention. With respect to
FIG. 8, the stripper spring (14) is compressed during the further downward movement and the bending punches (13) take the downward stroke and bend the strip / coil (15) against the die insert (5) according to one embodiment of the present invention. The stripper spring (14) is compressed during the further downward movement. The bending punches (13) take the downward stroke and bends the strip / coil (15) against the die insert (5). The flared hole (1) and the bend features are pushed inside the relief slot (16) of the die insert.
[0059] FIG. 9 illustrates a sectional view of a floating die insert assembly in a
press tool assembly showing upward stroke of the progressive press tool when the strip/coil is lifted to the strip lifting height and the die insert is also taken upward by the compression spring, according to one embodiment of the present invention. With respect to FIG. 9, the strip/coil (15) is lifted to the strip lifting height and the die insert (5) is also taken upward by the compression spring (7) according to one embodiment of the present invention.

G) ADVANTAGES OF THE INVENTION
[0060] The various embodiments of the present invention provide an
arrangement for processing coil/strips in progressive press tools, to perform
progressive punch and bend operations of coils/strips with damaging the punches and
bends that are already made in the processed coil/strip. The present invention
provides an arrangement in the bottom half of the press tool, to support the bending
operations and at the same time, facilitates smooth feeding of coil/ strip inside the
tool. The present invention provides an arrangement where the coil/strip is lifted
positively up-to the lifting height in the progressive press tool. The present invention
provides an arrangement for aligning of strips/coils in a progressive press tool at one
or more locations and according to the requirement so as to get constant reference for
punching holes. The present invention provides a floating die insert in which
the spring load and movement are adjusted according to the requirement.
[0061] Although the invention is described with various specific
embodiments, it will be obvious for a person skilled in the art to practice the invention with modifications. However, all such modifications are deemed to be within the scope of the claims.
[0062] It is also to be understood that the following claims are intended to
cover all of the generic and specific features of the present invention described herein
and all the statements of the scope of the invention which as a matter of language
might be said to fall there between. |

CLAIMS
What is claimed is:
1. A floating die assembly for press tools including a die block, the assembly
comprising:
Atleast one die insert guided in a die block at a press tool;
A spring arranged below the die insert;
A sleeve provided below the die insert;
An Allen screw inserted through the sleeve and clamped to the die insert;.
A washer provided between the Allen screw and the sleeve;
Wherein the die insert is provided with relief slots and the die insert is
projected up above a die surface in the press tool to the lifting height of a
strip or coil with the help of the spring.
2. The assembly according to claim 1, wherein the relief slots are formed on both the side surfaces of the die insert along the height direction to receive a bend which is formed in the strip or coil during a previous operation.
3. The assembly according to claim 1, wherein the relief slots are made as open channel along the feeding direction.
4. The assembly according to claim 1, wherein the spring is housed inside a packet provided in a backing plate and a base plate that are provided in the press tool.
5. The assembly according to claim 1, wherein the spring is in pre compressed condition during the downward stroke of a press in the press tool to push the die insert above the die surface upto the strip lifting height.

6. The assembly according to claim 1, wherein the spring is in compressed condition, when the die insert is pushed down during the downward stroke of the press.
7. The assembly according to claim 1, wherein the spring is selected based on the required stroke length of the press and the load.
8. The assembly according to claim 1, wherein the washer is arranged below the sleeve to provide a resting surface for both the Allen screw and the sleeve.
9. The assembly according to claim 1, wherein the washer acts as a stopper during the upward movement of the press, when the washer is in contact with a bottom surface of the backing plate.
10. The assembly according to claim 1, wherein the length of the sleeve is designed based on the required movement of the die insert and the spring load.