A saw chain includes a first tie strap, a first drive link coupled to the first tie strap, a second tie strap coupled to the first drive link, a second drive link coupled to the second tie strap, a third tie strap coupled to the second drive link, a first contoured cutting segment coupled to the first tie strap and having a first asymmetric profile, and a second contoured cutting segment coupled to the third tie strap and having a second asymmetric profile. The first contoured cutting segment and the second contoured cutting segment are oriented such that the first asymmetric profile is symmetric with the second asymmetric profile across the second drive link.

The apparatus for reverse cutting of a structure, according to the present invention, comprises a pair of reverse pulley devices, the pair of pulley devices comprising: main tubes inserted and mounted so as to penetrate two holes; a pair of first support pulleys mounted on the inner sides of the front ends of the main tubes to rotatably support a wire; a pair of second support pulleys mounted on the inner sides of the rear ends of the main tubes to rotatably support the wire; openings which are cut in portions where the two main tubes face one another and allow the wire to move; and cap covers which are coupled to the front ends of the main tubes to seal same.

The apparatus for reverse cutting of a structure, according to the present invention, comprises a pair of reverse pulley devices, the pair of pulley devices comprising: main tubes inserted and mounted so as to penetrate two holes; a pair of first support pulleys mounted on the inner sides of the front ends of the main tubes to rotatably support a wire; a pair of second support pulleys mounted on the inner sides of the rear ends of the main tubes to rotatably support the wire; openings which are cut in portions where the two main tubes face one another and allow the wire to move; and cap covers which are coupled to the front ends of the main tubes to seal same.

A chain bar unit for a wall saw is presented herein. The chain bar unit can include a bar configured to receive a circulating chain or wire around a perimeter of the bar. The chain bar unit also can include a driving gear for driving the chain or wire around the bar, the driving gear configured to be coupled to an output shaft of the wall saw. The chain bar unit further includes the bar being tapered from an end proximate to the driving gear to a distal end having a distal end radius, wherein a width of the bar at the proximate end, is at least two times the distal end radius of the distal end.

A small-sized wire saw device may comprise: a stand portion which comprises a main frame formed in a bar shape elongated in back and forth directions, an exterior frame located at the front portion of the main frame, and a connecting frame connecting the main frame and the exterior frame, while an object to be cut is located in front of the small-sized wire saw device; a slider portion which modes forward or downward on the main frame; a driving power unit including a first motor attached to the upper end of the slider portion; a main wheel which is attached to one side surface of the driving power unit and is rotated by the first motor; and a second motor which is located on the other side surface of the driving power unit and supports the movement of the slider portion.

A wire saw apparatus for an excavator, according to the present invention, comprises: a support plate; an excavator connection part attached to the support plate so as to be able to be detachably attached to an excavator arm; a pair of guide rails attached to the support plate; an ascending/descending member which ascends or descends along the pair of guide rails; an electric motor for raising or lowering the ascending/descending member; a driving pulley rotated by a hydraulic motor attached to the ascending/descending member; a plurality of driven pulleys mounted to the support plate; and a wire mounted to the driving pulley and the plurality of driven pulleys.

In CNC wire cutting process, the deflection of the wire due to cutting force is proportional to square of the wire length. Hence it is beneficial to adjust wire length as per job size and keep it minimal. But existing wire cutting machines, wire length adjustment is not feasible. Hence there is a need to develop a simple user-friendly method of wire length adjustment. This invention proposes a simple user-friendly method of wire length adjustment in abrasive wire (100A) and hot wire cutting (100B) machines. This invention also proposes an intelligent faster cutting method without affecting wire life or pulley life. This invention also proposes an intelligent method of start point selection in CNC wire cutting machines, to avoid part defects.

A wire saw apparatus comprises: a first pulley system from which a wire is withdrawn toward a structure to be cut; a second pulley system into which the wire is introduced from the structure; a first dust collection pipe unit provided to surround the wire between an end part at which surrounding of the structure by the wire ends and a part at which the wire is introduced into the first pulley system; and a second dust collection pipe unit provided to surround the wire between a start part at which surrounding of the structure by the wire starts and a part at which the wire is withdrawn from the second pulley system.

A wire saw apparatus comprises: a first pulley system from which a wire is withdrawn toward a structure to be cut; a second pulley system into which the wire is introduced from the structure; a first dust collection pipe unit provided to surround the wire between an end part at which surrounding of the structure by the wire ends and a part at which the wire is introduced into the first pulley system; and a second dust collection pipe unit provided to surround the wire between a start part at which surrounding of the structure by the wire starts and a part at which the wire is withdrawn from the second pulley system.

Disclosed is a dry cutting apparatus including a wire saw device configured to rotate a cutting wire installed so as to pass through two holes formed in a structure by drilling, a roller jig mounted to one side of the structure, the roller jig being configured to guide and support the cutting wire, a cover member coupled to one side of the structure, the cover member being configured to cover and seal a cut region, an air gun configured to blow compressed air to the cut region in a direction toward the cover member, and a dust collection device connected to one side of the cover member via a dust collection hose, the dust collection device being configured to collect debris.