FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10; rule 13)
1. Title of the invention. -
IMPROVED BENDING DIE ARRANGEMENT PROVIDING AUTOMATIC EJECTION OF COMPONENTS
2. Applicant(s)
(a) NAME : LARSEN & TOUBRO LIMITED
(b) NATIONALITY: An Indian Company.
(c) ADDRESS: L & T House, Ballard Estate, Mumbai 400 001,
State of Maharashtra, India
3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed:

TECHNICAL FIELD OF THE INVENTION
The present invention relates generally to pressing tool mechanism and more particularly to an improved bending die arrangement providing automatic ejection of component from a
punch.
BACKGROUND AND THE PRIOR ART
One of the widely known press tools is a bending die. Bending die comes under the mass production tool. Different types of bending dies are there for U-bend, L-bend, Z-bend etc. bending component in different shapes. When component has a straight shape without any previous bend as shown in fig. 1, then bending is very simple. After applying a load on punch, component will bend as shown in fig.2. When punch moves upwards at this stage, component still remain on the Die block. An Operator is required to remove this component using forcipes.
In fig.3 component has already L-shape. When one tries to bend this type of component the component will lock with the punch and as shown in fig.4. After bending if one moves the punch upwards then component also moves upward along with the punch because projection of component goes into the punch. Then after operation, operator will not able to remove this component using forcipes.
Conventionally, there are several methods to eject component form punch. One of the widely used methods is the use lever mechanism. This consists of the very accurate slide fits and very accurate machining process. By this mechanism operator will operate the lever by hand for striking the component outside the punch. The disadvantages of prior art are that cycle time is very large and space required for this mechanism is very large. Lever in this mechanism will protrudes outside the tool and requires large space. And this mechanism is purely manual. Fig 8 illustrates a conventional punch and die assembly using lever mechanism.

So there is a need to provide a mechanism which can remove the component from the punch after operation without use of a manual lever mechanism. Therefore, inventors of the present invention have developed an automatic ejection system for bending die that would not depend on springs and hence there would be a positive ejection.
OBJECTS OF THE INVENTION
A basic object of the present invention is to overcome the disadvantages/drawbacks of the known art.
Another object of the present invention is to provide an improved bending die arrangement providing automatic ejection of component from a punch.
Another object of the present invention is to eliminate manual operation in removal of a component from a punch.
Yet another object of the present invention is to provide a compact ejection mechanism.
These and other advantages of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings.
SUMMARY OF THE INVENTION
There is provided an improved bending die arrangement providing automatic ejection of component from a punch.
According to one embodiment of the present invention, there is provided a top assembly comprising a punch (3) operatively connected to a top plate (1), a hole in said punch (3) holding a striking pin (7) having a roller (8) attached thereto.

Other embodiment of the present invention provides a bottom assembly comprising a cam (6) fixed on a base plate (2), said cam having a slot adapted to provide to and fro motion to striking pin (7), a C frame (11) fixed to said base plate (2) holding die block (4) and a heel block (32) in a fixed position, said heel block supporting said punch (3), an ejector block (5) located in between said die block (4) and a heel block (12) adapted to float up and down, said ejector block having a locating pin (9) ensuring a proper location of component.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
In the appended drawings:
Fig 1 illustrates a component having straight shape without any bend.
Fig 2 illustrates a bending component after applying load.
Fig 3 illustrates a component having L-shape.
Fig 4 illustrates a component locking with a punch.
Fig 5 illustrates an automatic ejection system in a punch and dies assembly.
Fig 6 illustrates a component locking position of punch and dies assembly.
Fig 7 illustrates a component position outside the punch
Fig 8 illustrates a conventional punch and die assembly using lever mechanism
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The following drawings are illustrative of particular examples for enabling methods of the present invention, are descriptive of some of the methods, and are not intended to limit the

scope of the invention. The drawings are not to scale (unless so stated) and are intended for use in conjunction with the explanations in the following detailed description.
Reference is first invited to Fig 1 where a component having straight shape without any bend is shown. It shows load (14) given on a punch (3) on a component (13) placed on a die (4).
Fig 2 shows a bending component after applying load.
Fig 3 shows a component having L-shape.
Fig 4 shows a component locking with a punch.
Fig 5 shows an automatic ejection system in a punch and dies assembly. It shows different components like top plate, a punch, striking pin, roller etc.
Fig 6 shows a component locking position of punch and die assembly.
Fig 7 shows a component position outside the punch
Fig. 8 shows a conventional die assembly using a lever mechanism.
The invented system is thus an improved bending die arrangement providing automatic ejection of component from a punch.
DETAILED DESCRIPTION OF THE INVENTION
Accordingly in the present invention there is provided an automatic ejection system for bending die. Figure 5 shows the constructional features of automatic ejection system in a bending die assembly. It has a top assembly and bottom assembly. The top assembly has a punch (3) and a top plate (1). The punch (3) is fixed/ operatively connected to the top plate

(1). There is a hole in the punch (3) to provide a striking pin (7). This pin has a roller (8) at one end and this roller (8) is continuously moves upwards downwards directions.
The bottom assembly contains Cam (6) is fixed on base plate (2) and contains through slot in it (as shown in figure 5) to provide to and fro motion for the striking pin (7). Springs are not used in the mechanism hence it is a positive motion for the striking pin (7). C-Frame (11) is fixed to base plate (2).This C-Frame (11) holds the die block (4) and heel block (12) in a fixed position. This heel block (12) supports the punch (3) before operation starts. Ejector block (5) located in between die block (4) and heel block (12) and is floating up and down on assembly. The entire top assembly moves upward and downwards direction.
This entire assembly is clamped on the press like 16T press etc, Top assembly is connected to Ram and bottom assembly is clamped to press bed.
Working
Initially top assembly is taken up for loading the component. Ejector block (5) has a locating pin (9). This locating pin (9) will ensures the exact location of component where it has to be.
At first keep the component on the ejector block (5). At this time ejector block (5) is same level with die block (4) as shown in Fig.5. After loading the component, top assembly connected to ram of machine starts moving downward direction. During further downward movement of the punch (3), the component is gripped between the punch (3) and the ejector block (5). Further movement of the punch (3) will bend the component gradually. And component is locked in the punch (3) because of its shape as shown in fig.6. At this moment striking pin (7) has no function.
After taking sufficient stroke punch (3) will move upwards while component is also moves upwards along with the punch (3). While travelling of punch (3) the roller (8) connected to the striking pin (7) will contact against the taper portion of the cam (6), as shown in Fig.7. Because of this taper portion roller (8) pushes the striking pin (7) in forward direction and

striking pin (7) push the component outside the punch (3) as shown in Fig.7. Further movement of the punch (3) will not cause any forward movement of the striking pin (7).Then operator will remove the component. At this position Striking pin (7) will be at fully forward condition.
While closing the punch (3) ram moves the punch downwards, at this time the roller (8) once again come in contact with the taper portion of the cam (6) and striking pin (7) will move backwards to the original position.
ADVANTAGES:
a. It does not depend on springs, hence positive ejection is possible.
b. This mechanism is very cheap as compared to existing mechanisms.
c. No operator attention is required, reduce the operator fatigue.
d. No damage to the component.
Constructional elements
1. Top plate. 7. Striking pin.
2. Base plate. 8. Roller.
3. Punch. 9. Locating Pin
4. Die block 10. Ejector pin
5. Ejector block 11. C-frame.
6. Cam 12. Heel block.
Although the embodiments herein are described with various specific embodiments, it will be obvious for a person skilled in the art to practice the embodiments herein with modifications. However, all such modifications are deemed to be within the scope of the claims.

It is also to be understood that the following claims are intended to cover all of the generic and specific features of the embodiments described herein and all the statements of the scope of the embodiments which as a matter of language might be said to fall there between.

WE CLAIM:
1. An improved bending die arrangement providing automatic ejection of component
from a punch, said arrangement comprising:
a top assembly comprising a punch (3) operatively connected to a top plate (1), a hole in said punch (3) holding a striking pin (7) having a roller (8) attached thereto;
a bottom assembly comprising a cam (6) fixed on a base plate (2), said cam having a slot adapted to provide to and fro motion to striking pin (7),
frame (11) fixed to said base plate (2) holding die block (4) and a heel block (12) in a fixed position, said frame being substantially C shaped;
said heel block supporting said punch (3) wherein said heel block (12) adapted to float up and down,
an ejector block (5) located in between said die block (4) wherein said ejector block having a locating pin (9) ensuring a proper location of component;
wherein said roller adapted to push said striking pin thereby pushing component out of said punch.
2. Arrangement as claimed in claim 1 wherein said top assembly is connected to a ram and said bottom assembly clamped to a press bed.
3. Arrangement as claimed in claim 1 further comprising an ejector pin (10).

4. Arrangement as claimed in claim 1 wherein said punch adapted to move said striking pin in substantially forward direction.
5. An improved bending die arrangement providing automatic ejection of component from a punch as herein described and illustrated with reference to accompanying drawings.