DESC:FIELD OF INVENTION
The present invention relates to a compact, cost effective stapler and more particularly, to an improved multi-pin stapler to accommodate staple pins of different sizes within the single stapler.

DESCRIPTION OF PRIOR ART
Generally a stapler is a mechanical device that joins sheets of paper or similar material by driving a thin metal staple through the sheets and folding the ends. The stapler use staples that are typically U-shaped and have two pointed legs to fasten pieces of paper together. The pointed legs of a staple are forced through the pieces of the paper, extend out of the pieces of paper and are bent to hold the pieces of paper together.

A common problem of most of the staplers is having provision to accommodate only particular size of staples to staple a stack of paper of particular thickness together. A heavy-duty stapler uses staples with long legs that are only suitable for stapling a thick stack of paper together. Furthermore, the staples in a heavy-duty stapler cannot be used effectively to staple a thin stack of paper together, because the pointed legs of the staples for the heavy-duty stapler are so long that they wrap around and protrude from the top surface of the stack.

US6942136 is a staple apparatus installed in a stapler so the stapler can staple stacks of paper with different thicknesses without having to change staples or components in the stapler. The apparatus cuts legs of a staple to a proper dimension after the staple has been driven completely into a stack of paper and bends the protruding ends to bind the stack of paper together.
WO2002049817 is a stapler that has a first former configured for forming a staple to a first crown size and a second former configured for forming a staple to a second crown size that is different than the first crown size. The stapler also has an actuation mechanism operatively associated with the first and second formers to selectively operate the first or second formers, in the first and second configurations respectively to form the staples.

Although the stapler to staple stacks of paper with different thicknesses is available, there is no stapler available with the configuration to accommodate pins of different sizes in a single stapler.

Accordingly, there exists a need for a compact, cost effective multi-pin stapler with the configuration to accommodate staple pins of different sizes in the single stapler.

OBJECTS OF INVENTION
One or more problems present of the prior art may be overcome by various embodiment of the system of the present invention.

It is the primary object of the present invention to provide a compact, cost effective stapler.

Another object of the present invention is to provide an improved multi-pin stapler with the configuration to accommodate staple pins of different sizes within the single stapler.

It is another object of the present invention, wherein the improved multi-pin stapler is utilized to load and dispense one or more sizes of staple pins.

SUMMARY OF INVENTION
Thus according to the basic aspect of the present invention, there is provided a stapler, comprising a base; a mounting bracket attached to the base; a staple magazine positioned above the base housing one or more staple pins; a staple opening; a spring biased staple feeding mechanism with a driver guide having a sliding stopper of pre-defined dimension to drive the staple pins to the staple opening, and a lever with a proximal end and a distal end pivotally mounted on the mounting bracket, characterized in that the stapler comprising a detachable metal strip of pre-defined dimension positioned on the driver guide of staple feeding mechanism within the staple magazine to hold the staple pins.

It is another aspect of the present invention, characterized in that the detachable metal strip accommodates small staple pins of pre-defined dimension.

It is another aspect of the present invention, characterized in that the metal strip is detached from the driver guide positioned within the staple magazine to accommodate big staple pins of pre-defined dimension.

It is another aspect of the present invention, characterized in that the big staple pins of pre-defined dimension are positioned directly on the driver guide.

It is another aspect of the present invention, characterized in that the sliding stopper drives the staple pins of pre-defined dimension to the staple opening to dispense the staple pins through a driver blade positioned in front end of the staple magazine.

It is another aspect of the present invention, characterized in that the staple opening includes protrusions in pre-defined spacing to output the staple pins of different sizes.

It is another aspect of the present invention, wherein the stapler accommodates staple pins of different sizes within the single stapler.

BRIEF DESCRIPTION OF THE DRAWING:
Figure 1: illustrates the perspective views of the multi-pin stapler according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING FIGURE
The present invention is thus directed to an improved multi-pin stapler with the configuration to accommodate staple pins of different sizes within the single stapler.

Referring to Figure 1, the stapler comprising a base [1] having forward and rearward ends; a mounting bracket [2] attached to the base [1]; a staple magazine [3] positioned above the base [1] housing one or more staple pins [4a and 4b]; a staple opening; a spring biased staple feeding mechanism [5] with a driver guide having a sliding stopper [6] of pre-defined dimension to drive the staple pins [4a and 4b] to the staple opening, and a lever [7] with a proximal end and a distal end pivotally mounted on the mounting bracket [2], characterized in that the stapler comprising a detachable metal strip [8] of pre-defined dimension positioned on the driver guide of staple feeding mechanism [5] within the staple magazine [3] to hold the staple pins [4a and 4b] of pre-defined dimension. The staple pins [4a and 4b] loaded in the staple magazine [3] are sequentially driven out of the stapler by a driver blade [9] positioned in front end of the staple magazine [3].

The improved multi-pin stapler with the detachable metal strip [8] of pre-defined dimension is capable of holding small staple pins [4a] of pre-defined dimension and function as the conventional stapler to dispense the small staple pins [4a]. The metal strip [8] is detached from the driver guide positioned within the staple magazine [3] to accommodate big staple pins [4b] of pre-defined dimension. The big staple pins [4b] of pre-defined dimension are positioned directly on the driver guide and function as the conventional stapler to dispense the big staple pins [4b]. The sliding stopper [6] drives the big staple pins [4b] without detachable metal strip [8] to the staple opening to dispense the big staple pins [4b] through the driver blade [9] and similarly the small staple pins [4a] of pre-defined dimension positioned within the detachable metal strip [8] to the staple opening to dispense the small staple pins [4a] through the driver blade [9].

The staple opening includes protrusions in pre-defined spacing to output the staple pins [4a and 4b] of different sizes. The improved multi-pin stapler is utilized to load and dispense one or more sizes of staple pins [4a and 4b].
,CLAIMS:I CLAIM:
1. A stapler, comprising a base [1]; a mounting bracket [2] attached to the base [1]; a staple magazine [3] positioned above the base [1] housing one or more staple pins [4a and 4b]; a staple opening; a spring biased staple feeding mechanism [5] with a driver guide having a sliding stopper [6] of pre-defined dimension to drive the staple pins [4a and 4b] to the staple opening, and a lever [7] with a proximal end and a distal end pivotally mounted on the mounting bracket [2], characterized in that the stapler comprising a detachable metal strip [8] of pre-defined dimension positioned on the driver guide of staple feeding mechanism [5] within the staple magazine [3] to hold the staple pins [4a and 4b].

2. The stapler as claimed in claim 1, characterized in that the detachable metal strip [8] accommodates small staple pins [4a] of pre-defined dimension.

3. The stapler as claimed in claim 1, characterized in that the metal strip [8] is detached from the driver guide positioned within the staple magazine [3] to accommodate big staple pins [4b] of pre-defined dimension.

4. The stapler as claimed in claim 1, characterized in that the big staple pins [4b] of pre-defined dimension are positioned directly on the driver guide.

5. The stapler as claimed in claim 1, characterized in that the sliding stopper [6] drives the staple pins [4a and 4b] of pre-defined dimension to the staple opening to dispense the staple pins [4a and 4b] through a driver blade [9] positioned in front end of the staple magazine [3].

6. The stapler as claimed in claim 1, characterized in that the staple opening includes protrusions in pre-defined spacing to output the staple pins [4a and 4b] of different sizes.

7. The stapler as claimed in claim 1 accommodates staple pins [4a and 4b] of different sizes within the single stapler.