Textiles: knitting – Feeding – Positive
Reexamination Certificate
2000-03-09
2001-01-30
Worrell, Danny (Department: 3741)
Textiles: knitting
Feeding
Positive
C066S13200T, C242S366000
Reexamination Certificate
active
06178783
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to an improved yarn feeder for a knitting machine and particularly to an improved yarn feeder that is simple to fabricate and assemble and has a lower cost with enhanced feeding reel precision.
BACKGROUND OF THE INVENTION
A Conventional yarn feeder for knitting machines such as the one shown in
FIGS. 1 and 2
usually includes a frame A, a feeding reel B, a brake C, a pulley D, a holder E, a transmission spindle F and a yarn guide G. The feeding reel B is located below the frame A and held by the holder E and driven by the transmission spindle F which passes through the frame A to engage with the pulley D located above the frame A. The rotating pulley D drives the yarn reel B to rotate for pulling yarn I from a yarn pool H. The yarn I leaves the yarns pool H, passes through a guide bracket J, a filter K, a press disk L, below an upper brake lever M, a first porcelain eye N, winds a number of times around the yarn reel B, then passes through above a porcelain bar of the yarn guide G, below a lower brake lever O, a second porcelain eye Q and reaches a knitting needle for knitting process. The yarn reel B provides a stable tension yarn for producing high quality fabric. The yarn reel B includes a driving wheel S engaged with a driven wheel T which has a spindle opening U engaged with a bearing R which in turn engages with the holder E and mounted below the frame A. The yarn reel B thus is able to turn freely about the bearing R.
The driven wheel T has a plurality of equally spaced rods V extending downward. Below the driven wheel and between a pair of adjacent rods V, a cavity bore W is formed. The driving wheel S has a center spindle bore X enageable with one end of the spindle F and a plurality of elongated bars Y engaged with the cavity bores W when assembled with the driven wheel T. The yarn reel B has a taper angle from the top of the driven wheel T to the bottom of the driving wheel S so that yarn I wound around the yarn reel B may slip downward during the knitting process to make yarn feeding smooth and steady. As the driving wheel T and the rods V are usually made by injection molding plastics, the precision of the rods V is often less than desired. When in use, one end of the rod V engages with the driving wheel S which may increase dimensional distortion of the elongated bars Y. The dimensional accuracy of the yarn reel B after assembly thus may be further downgraded.
The holder E is made of metal and has an inclined top surface mounted on the frame A through a washer (not shown). It takes a lot of machining work to attain the precision required. The machining of the spindle F is equally demanding and time consuming. All this increases production time and cost.
Furthermore the press disk L uses a spring force to give yarn a tension. It does not finction well for thin or smooth yarns and may result in yarn dropping from the yarn reel B which affects the knitting machine operation. All of aforesaid problems and disadvantages are still begging for improvement.
SUMMARY OF THE INVENTION
It is an object of this invention to provide an improved yarn feeder for knitting machines that has an improved feeding reel which may be made with high-precision at low cost and has smooth profile for avoiding yarn jam or breakage. The feeding reel of this invention has a driving wheel with a plurality of spoke like ribs. Each rib has a slot opening at the free end engageable with an elongated bar. The feeding reel further has a driven wheel with a trough formed in a top wall for the driving wheel to pass through so that the driving wheel and the driven wheel may form together a strong and highly accurate assembly with a smooth profile for the yarn to wind around and move smoothly thereon during the knitting process.
It is another object of this invention to provide a feeding reel holder made of injection molded plastics which may be made at low cost and has desired slope and dimension to mount the driven wheel on the frame precisely without causing yarn jam.
It is a further object of this invention to provide an improved yarn feeder that has a two head bushing engageable with the pulley and the spindle so that the driving wheel may engage easily and securely with the pulley. The spindle has an uniform diameter and thus may be produced at a lower cost.
It is yet another object of this invention to provide an improved yarn feeder that has an improved press block which includes magnetic yarn press barrels for pressing yarn at steady and desired pressure and a knife slot for removing yarn debris.
It is still another object of this invention to provide an improved yarn feeder that has movable blocks in the driven wheel for holding yarn debris so that higher quality of fabric may be produced and yarn debris may be collected and removed by operator easily.
REFERENCES:
patent: 3955769 (1976-05-01), Kajiura et al.
patent: 4114823 (1978-09-01), Fecker et al.
patent: 4754936 (1988-07-01), Guell et al.
patent: 5802879 (1998-06-01), Min
patent: 5802880 (1998-09-01), Min
patent: 5802881 (1998-09-01), Lin
patent: 5839685 (1998-11-01), Chen
Dougherty & Troxell
Worrell Danny
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