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FIELD OF THE INVENTION 
     The invention relates to a pneumatic steel bar binding machine mechanism to bind two or more column-shaped steel bars together, particularly the steel framework contained inside concrete structures in construction works, the components in a main unit  10  include an air valve chamber  30 , a cylinder chamber  50 , a pneumatic motor  70 , a steel staple  20 , a staple cartridge  40  and a spiral twister  80  and a J-mechanism  60 . 
     [Prior Art] 
     Conventionally, the steel bars regularly used in the construction of concrete structures are fastened by tying iron wires directly around them with hands and/or pliers. Such a binding process can be sophisticated and troublesome, as well as time and labor consuming. Slight negligence on the operator&#39;s part will result in improper binding efficiency, causing potential risks to the steel bars that may loosen. At the present, some construction workers may use an electrical steel bar binding machine. The motor in such a binding machine, however, may overheat after an extended period of use. Furthermore, direct sunshine often adds to its burden. Also, because the electrical cord of the steel bar binding machine is very long, a worn or torn electrical cord may result in leak of electrical conductance and cause danger in its operation. Besides, the steel bar binding machine itself is quite heavy, its binding speed is slow and inefficient, which can cause increased working costs. 
     SUMMARY OF THE INVENTION 
     It is therefore the objective of this invention to provide a pneumatic steel bar binding machine mechanism with high efficiency, low labor strength, and safe operation, which will quickly and automatically push out a steel staple tightly against the steel bars, to enable firmer binding point, and since the pressing force and binding force are automated, its binding efficiency can be assured. 
     In accordance with the foregoing, a pneumatic steel bar binding machine is provided. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS 
     The invention can be fully understood by reading the following detailed description of three preferred embodiments, with reference made to the accompanying drawings, wherein: 
     FIG. 1 is a perspective view of the invention of pneumatic steel bar binding machine. 
     FIG. 2 is an exploded view of the invention of pneumatic steel bar binding machine before it is assembled. 
     FIG. 3 is an exploded view of the invention of pneumatic steel bar binding machine before it is assembled. 
     FIG. 4 is a perspective view taken from another angle of the spiral twister of the invention of pneumatic steel bar binding machine. 
     FIG. 5 illustrates the lower section of the J-mechanism in the invention of pneumatic steel bar binding machine. 
     FIG. 6 is a perspective view of the steel staple of the invention of pneumatic steel bar binding machine. 
     FIG. 7 illustrates how the steel staple of the invention of pneumatic steel bar binding machine has fastened two steel bars crossing each other. 
     FIG. 8 is a section view of the invention of pneumatic steel bar binding machine. 
     FIG. 9 illustrates how air flows in the invention of pneumatic steel bar binding machine. 
     FIG. 10 illustrates how air flows in the invention of pneumatic steel bar binding machine. 
     FIG. 11 illustrates how the steel staple of the invention of pneumatic steel bar binding machine has fastened two steel bars crossing each other. 
     FIG. 12 illustrates another embodiment of the invention of pneumatic steel bar binding machine in the process of binding two thinner parallel steel bars. 
     FIG. 13 is an exploded view of J-mechanism in yet another embodiment of the invention of pneumatic steel bar binding machine. 
     FIG. 14 illustrates another embodiment of the invention of pneumatic steel bar binding machine in the process of binding two thicker parallel steel bars. 
    
    
     BRIEF DESCRIPTION OF NUMERALS 
       10  main unit of pneumatic steel bar binding machine 
       20  steel staple 
       30  air valve chamber 
       40  staple cartridge 
       50  cylinder chamber 
       60  J-mechanism 
       70  pneumatic motor 
       80  spiral twister 
       90  ramming mechanism 
       21  trigger 
       22  air inlet channel 
       23  air input hole 
       24  upper oblique channel 
       25  air inlet 
       26  air outlet 
       27  mini air inlet 
       28  twisted rope 
       29  lower oblique channel 
       30  air blocking nut 
       33  spring 
       34  air valve 
       36  air stop rubber ring 
       37  accommodating hole 
       38  striking rod 
       40  staple cartridge 
       41  air blocking screw 
       42  depressed channel 
       45  hollow channel 
       46  air stop rubber ring 
       47  striking rod air inlet 
       48  striking rod air outlet 
       50  cylinder chamber 
       51  magnetic nut 
       52  air stop rubber ring 
       53  magnet 
       54  round iron 
       55  planet gear set 
       56  rivet 
       57  pressing plate 
       58  ramming rod 
       59  air blocking rubber ring g 
       60  J-mechanism 
       61  transmission shaft 
       62  large bearing 
       63  screw 
       64  small bearing 
       65  small gear 
       66  gear pin 
       67  nut 
       68  large gear with large hole 
       69  small gear overlapping large gear 
       70  pneumatic motor 
       71  support ring 
       72  arched and V-shaped groove 
       73  large gear with small hole 
       74  twister blade 
       75  speed reducing mechanism cover 
       76  arched groove 
       77  accommodating hole 
       78  flattened post 
       79  parallel arched groove 
       80  spiral twister 
       90  ramming mechanism 
       60 ′ J-mechanism 
       601 ′ connecting block 
       602 ′ accommodating hole 
       603 ′ placement hole 
       61 ′ transmission shaft 
       64 ′ small bearing 
       65 ′ small gear 
       66 ′ gear shaft 
       661 ′ small bearing 
       662 ′ small bearing 
       67 ′ nut 
       68 ′ idler 
       681 ′ gear pin 
       69 ′ small gear 
       71 ′ support ring 
       73 ′ large hole large gear 
       75 ′ speed reducing mechanism cover 
       77 ′ accommodating hole 
       79 ′ parallel arch groove 
       80 ′ spiral twister 
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     Please refer to FIGS. 1 and 2, which illustrate a perspective view and an exploded view of the invention of pneumatic steel bar binding machine. The binding machine is composed mainly of a main unit and a J-mechanism, the main unit comprising: 
     The air valve  34 : two air stop rubber rings  36  are inserted in the middle section on its surface with a groove in its middle section, at the middle section of the groove is a transverse air inlet  25 , at its lower section is also a groove at which middle section is a transverse air outlet  26 , at the center of its upper end is a round hole, penetrating to the center of its lower end, to form an accommodating hole  37 , the area around the surface of the accommodating hole  37  is larger than the area of the round hole, to be inserted by the striking rod  38 , so that it can slide up and down, to control the flow of air, (this is a three-section air valve). 
     The striking rod  38 : at the center of its upper surface is drilled a round hole, extending to its lower section is a transverse penetrating air outlet  48 , forming a hollow air channel  45 , on the upper section of said;hollow air channel  45  is a tapping thread, to tighten the air blocking screw  41 , the middle section of the striking rod  38  has a recess to form a channel  42 , to allow air to flow through an upward and oblique channel  24  to a cylinder chamber  50 , at the middle section of said recessed channel  42  is a transverse and penetrated air inlet  47 , to allow air to flow through this air inlet  47  to the air outlet  48  to the lower oblique channel  29  to the cylinder chamber  50 . 
     The air blocking nut  31 : screwed tight at the top of the air valve chamber  30 , at the center of its bottom surface is installed a spring  33 , to facilitate up and down movement of the striking rod. 
     The parts inside the cylinder chamber  50  include a magnetic nut  51 , an elongated square air blocking rubber  59  and a ramming mechanism  90 , in which: 
     The cylinder chamber  50 : at its bottom is a gutter, on the outside surface at the bottom of the cylinder chamber  50  is installed an elongated square air blocking rubber ring  59 , at the center of the elongated square air blocking rubber ring  59  is a gutter to facilitate extension of the ramming rod  58  out of the cylinder chamber  50 . 
     The magnetic nut  51 : tightened at the top of the cylinder chamber  50 , at its bottom is a magnet  53  to suck a round iron  54 . at the top of the ramming mechanism  90 , to reset the ramming mechanism  90  to its correct position. 
     The ramming mechanism  90 : at its top is a round iron  54 , at the center of the lower surface of the round iron  54  is inserted a ramming rod  58 , the end of the ramming rod  58  is inserted in the gutter at the bottom of the cylinder chamber  50 . The bottom end of the ramming rod  58  is processed in the shape of a reverses-U groove, around the groove is drilled a semi-circle guide groove, so designed that when the ramming rod  58  is to ram on the steel staple, the steel staple can be set in position. 
     The pneumatic motor  70 : similar to a regular pneumatic motor, the only difference is that on one side of a cylinder chamber  50  is drilled a mini air inlet  27 , and the end section of the core column of the pneumatic motor  70  is machined to become a small gear and a planet gear  55  that are toothed as a set of speed reducing unit. 
     The steel staple: made of a metal steel filament of powerful tenacity and pulling strength and machined in the shape of a reverse-U, as shown in FIG. 6, the middle section of the top of the steel staple  20  is parallel, the function of the parallel small section is to enable secondary bending when it contacts the steel bar, so the two ends can be twisted by a spiral twister  80 . Two ends of the steel staple are cut in an oblique 45-degree angle with a slightly wider end of the U-shape opening, to avoid impact when the steel staple  20  is inserted in the spiral twister  80 . 
     The staple cartridge  40 : similar to a regular staple cartridge, except that the specifications of the width and height and shape of the gutter inside the staple cartridge are designed to suit the steel staple. 
     As shown in FIG. 3, parts inside the J-mechanism  60  include a transmission shaft  61 , a spiral twister  80 , a bearing  61 , a small gear  65 , a large gear  68 , a gear pin  66 , and a support ring  71 , in which: 
     The spiral twister  80 : made of a hard and tenacious metal alloy by lost wax precision casting, the whole unit has a protrusion, at the center of its top is drilled a V-shaped hole having a wider upper section and a narrower lower section (shown in FIG.  4 ), in the hole is installed two arched twister cutting blades  74  with a thicker end and a thinner end, between the two twister cutting blades  74  is the formation of a round hole with a specified depth, to twist the two ends of the steel staple into a twisted rope  28  (shown in FIG.  7 ), at the lower section of the round hole is a flattened post  78  that serves to tighten the two twister cutting blades  74 , and to control the length and tension of the twisted rope  28 . The disc at its lower part is machined as a gear disc, which is toothed with the large gear  73  as one set. On the outside rim of the spiral twister  80  is installed a support ring  71 , at the top of the support ring  71  are two opposing openings of arched groove  76 , serving to set the steel bars to be bound in position, and, between the arc groove  76  and the arc groove  76 , on the inside edge, are erected two arcs, and, the opposing V-grooves  72  serve to align the steel staple when the steel staple is inserted into the spiral twister. 
     The J-mechanism  60 : made of tenacious and hard metal alloy by lost wax precision casting, the entire unit is a monobloc formed J-mechanism  60  (shown in FIG.  5 ). The top of the J-mechanism  60  is in a square shape, on the protrusions at four corners are four round holes, serving to tighten four screws linking the pneumatic motor  70 , at the center of the top of the J-mechanism  60  is drilled a round hole with a larger upper part and a smaller lower part, which penetrates to the center of the bottom of its lower part, to become an accommodating hole  77 , to accommodate penetration by the planet gear  55  and the transmission shaft  61 , while on the upper and lower ends of the transmission column  61  are bearings for positioning purpose. The end section of the transmission shaft  61  is machined in a square shape, at the end of the square is screw thread to accommodate the small gear  65 , the small gear  65  is toothed to the large gear  68 , the upper part of the large gear  68  is overlapping on the small gear  69 , thus by engaging the small gear  69  to the large gear  73 , and the large gear  73  to the gear disc at the lower part of the spiral twister  80 , the speed can be reduced, and the spiral twister will perform its twisting function and bind the steel bars. 
     Please refer to FIG. 8, which is a section view of the invention of pneumatic steel bar binding machine, this view illustrates a static condition before a press  21  is depressed, in which, air is flowed from the air inlet channel  22  simultaneously to the air hole of the air inlet  25  (airflow A) at the middle section of the air valve  34 , and since the air outlet  48  of the striking rod  38  and the air inlet  25  of the air valve  34  are split, to prevent air from flowing to the upper oblique channel  24  and the lower oblique channel  29 . In the static condition of the press  21  before it is depressed, the main unit of pneumatic binding machine  10  is not in use, it will simultaneously prevent the main unit of the binding machine, when not in use, air flowing into the cylinder chamber  50  and result in automatic ramming on the steel staple by the ramming mechanism  90  and result in danger. 
     Please refer to FIGS. 9 and 10, which illustrates how air flows in the invention of pneumatic steel bar binding machine, FIG. 9 shows how air flows when the binding machine has hooked onto the spot where steel bars are to be bound and the press  21  is depressed, in which, when the trigger  21  is pressed upwardly, air flows from the air inlet  25  to the depressed channel  42  of the striking rod  38  and upwardly out of the air valve  34 , air flows simultaneously to the upper oblique channel  24 , to the cylinder chamber  50  (airflow B), and simultaneously ram on the ramming mechanism  90 , so that the ramming mechanism  90  escapes the magnet  53  and rams downwardly, so the rammer rod  58  rams the steel staple  20  to the steel bars and achieve the purpose of the rammer. Then, airflow B flows from the mini air inlet  27  of the cylinder chamber  50  into the pneumatic motor  70 , the pneumatic motor  70  rotates and drives the spiral twister  80 , and twist the two ends of the steel staple  20  into a twisted rope  28  (shown in FIGS.  7  and  11 ). As shown in FIG. 10, it illustrates how air flows when the trigger  21  is half released, when the trigger is half released, the upper outlet is closed, when the ramming mechanism  90  completes its ramming function, airflow B in the cylinder chamber  50  flows quickly from the mini air inlet  27  to the pneumatic motor  70 , then there is not much air in the cylinder chamber  50 , and meantime, since the trigger is half released, and the air outlet  48  of the striking rod  38  is opened, air flows instantly to the air inlet  47  of the striking rod  38  and out of the air outlet hole  26  of the air valve  34 , meanwhile, airflow flows to the lower oblique channel  29 , to the cylinder chamber  50  (airflow C) and rams on the ramming mechanism  90  and quickly rise, because of the powerful upward pushing force, the round iron  54  at the top of the ramming mechanism  90  rams on the magnet  53  on the magnetic nut  51  before it drops down, then, the magnetic force of the magnet  53  installed on the magnetic nut  51  will capture the round iron  54  at the top of the ramming mechanism  90 , and reset to its position. When the ramming mechanism  90  has reset to its position, airflow C will be discharged from the mini air inlet hole  27 . 
     Aforementioned airflow occurs when the trigger  21  is pressed and released intermittently, to complete reciprocation of the striking rod  38 , as well as other functions such as the ramming and resetting of the ramming mechanism  90 , rotation of the pneumatic motor  70  to drive the spiral twister  80 , air input and air output, and the steel bar binding operation, so that the operation can be automated to upgrade quality and efficiency. 
     In another embodiment of the invention described above, thinner parallel steel bars can be tied and bound. In this embodiment shown in FIG. 12, the ramming mechanism  90  and the staple cartridge  40  are positioned at the front of the cylinder chamber  50  and assembled at 90 degrees to bind thinner parallel steel bars. 
     In yet another embodiment of the invention described above, thicker parallel steel bars can be tied and bound. In the embodiment shown in FIGS. 13 and 14, the ramming mechanism  90  and the staple cartridge  40  are positioned at the front of the cylinder chamber  50  and assembled at 90 degrees to bind thicker parallel steel bars. Parts in the J-mechanism  60 ′ include a transmission shaft  61 ′, a spiral twister  80 ′, a bearing  64 ′, a small gear  65 ′, an idler  68 ′, a gear pin  681 ′, a small hole large gear  73 ′, a gear shaft  66 ′, a small gear  69 ′, and a support ring  71 , wherein the top of the J-mechanism  60 ′ is square, with four round holes drilled on the protrusion from the tips of four corners, which serve to tighten four screws,  63  that are joined to the pneumatic motor  70 . At the center of the upper end is drilled a round hole with a larger upper section and a smaller lower section, penetrating to the square connecting block  601 ′ at the bottom of its lower section, forming an accommodating hole  602 ′, which serves to be inserted by the planetary gear set  55  and the transmission shaft  61 ′. At the upper and lower parts of the connecting block  601 ′ is drilled a locking hole, at the lower part of the accommodating hole  602 ′ is a positioning hole  603 ′ to install the small hole large gear  73 ′. At the upper and lower ends of the transmission shaft  61  ′ are bearings for positioning purpose. Its end section is machined as a square, at the end of the square is a screw thread to accommodate the small gear  65 ′. On the top of the support ring  71 ′ is a square locking plate, on its upper and lower parts is drilled a round hole, which serves to tighten the two screws joining the connecting block  601 ′. At the center of the upper end is drilled a round hole penetrating to the bottom of the lower section, forming an accommodating hole  77 ′, which is inserted by the small hole large gear  73 ′ and t he gear shaft  66 ′, with bearings at the upper and lower end so the gear shaft  66 ′ for positioning purpose. Its end section is machined as a square, on the tail of the square is a screw thread to accommodate the small gear  69 ′, whereby speed can be reduced by the small gear  65 ′ in mesh with the idler  68 ′, the idler  68 ′ in mesh with the large gear  73 ′, the large gear  73 ′ driving the small gear  69 ′, and the small gear  69 ′ in mesh with the lower end of the spiral twister  80 ′, so the spiral twister  80 ′ will perform its twisting function and fasten the steel bars. 
     As described above, the novelty and practical production of the pneumatic steel bar binding machine will achieve the performance and efficiency anticipated in the invention. Therefore, this application is duly filed. Your favorable consideration will be appreciated.

Summary:
A pneumatic steel bar binding machine mechanism to bind two or more column-shaped steel bars together, or specifically, a machine to bind the steel frames inside the concrete framework in construction works, characterized in a pneumatic mechanism and a spiral twister that press steel staples in the shape of reversed-U onto the steel bars to be bound, before the spiral twister is driven to twist the two ends of the steel staple into a twisted rope, to secure the steel bars.