Textiles: spinning – twisting – and twining – Apparatus and processes – Untwisting
Reexamination Certificate
1999-01-25
2001-07-17
Calvert, John J. (Department: 3765)
Textiles: spinning, twisting, and twining
Apparatus and processes
Untwisting
C057S094000, C057S100000
Reexamination Certificate
active
06260341
ABSTRACT:
OBJECT OF THE INVENTION
The present invention relates to a modular machine for spinning and doubling with individual transmission elements for spindles, with a continuous and individual conical or double conical folding system, by means of conventional asynchronous alternative current motors controlled by frequency converters and programmed by a control or microprocessor unit.
BACKGROUND OF THE INVENTION
The textile industry uses two types of continuous spinning and doubling, machines which, among other elements, are provided basically with some elements, called spindles, in a number ranging from five to several hundred units in each machine. The spindles turn continuously at the same speed, driven by only one electric motor by means of gear or pulleys assembly. Also, each spindle can be driven by an individual electric motor, with all motors controlled by a frequency variation unit so that all spindles turn at a same speed.
Although these machines have a high efficiency, all of their spindles turn at the same speed. Consequently, they all have to use the same thread type and are unable to combine different thread types in order to perform simultaneous short operations. Therefore, when it is necessary to produce different spinning and doubling operations, it is necessary to adapt the machine to the new process, causing an increase in production costs.
Furthermore, in spinning, doubling, textile spinning, spool roving frame, spool doubling, and similar machines, the thread obtained is stored in spinning bobbins, while the process for doubling the final product has suffered changes. The conventional process consist of the so called “reel” doubling, where the product is wound around a cylindrical reel provided in its upper and lower sides, with rims to prevent the thread from separating from the cylinder. This process had several inconveniences. For example, to carry out the unfolding of the thread in the process, it was necessary to turn the reel to avoid the breakage of the thread due to the strain caused by the pulling of the bobbin. Another inconvenience is that the unfolding had to be performed perpendicularly to the turning axis, in order to avoid thread breakage due to fouling in the bobbin upper rim.
A new reel type was later developed, which was known as “conventional conical.” This reel type reduced the upper rim to a diameter slightly larger than that of a central axis, so that the bobbin obtained had a mixed shape, with a conical upper portion. With this new pattern, although some of the previous inconveniences of the previous “reel” type model were eliminated, some problems remained. For example, in order to identify the bobbin pattern, it is necessary to match the cone angle with the number of coats required to obtain the required configuration. It will also be necessary to repeat such process for each reel type provided in the spinning machine, in the case that thread of different types and thicknesses are used, thus affecting the machine efficiency. Another inconvenience is that, when finishing a manufacturing cycle, the machine stops completely, and therefore all spindles stop turning even if they have not completed their process. As a result, time is wasted. Additionally, it is not possible to have bobbins with the same pattern when processing different products in the different spindles of spinning, doubling, textile spinning, spool roving frame, spool doubling, and similar machines.
SUMMARY OF THE INVENTION
With the purpose to prevent all serious inconveniences indicated above, when it is necessary to spin or double small amounts of product and to avoid wasting time relating to machine preparation, an improved modular machine for spinning and doubling with elements for spindles individual transmission has been developed. The invention also relates to a new system for doubling threads and welts as a continuous and individual conical or double conical folding system with a corresponding programming and control unit.
The modular machine for spinning and doubling with elements for spindles individual transmission with a continuous and individual conical or double conical folding system is made of a frame which includes two metal cabinets, one on a left side and one on a right side. The frame has a vertical cubic shape, made preferably in steel plate. The exterior of each cabinet has a pivoting access door. The central portion of the frame connects the two cabinets, fastened by bolts, is provided with cross bars made preferably of welded steel tubes, which act as a support for the different moving elements that will be described hereinafter.
The central portion of the frame contains within the space between both cabinets and held by the crossing tubes, preferably between one and thirty spinning or folding spindles, each having its own driving means. The spindles turn vertical to the axis on which the different types of spinning or folding reels will be mounted. The spindles are held by a twin roller system, of the ball bearing type. The upper bearing unit is packed in connection with a synthetic rubber ring to absorb the radial vibrations, and the lower bearing unit is mounted on a swinging support that is allowed to be displaced radially.
The spindle bottom part has fastened to it a pulley arranged to receive a transmission flat belt, for connection to the output of an induction electrical motor mounted on a pair of crossing tubes placed in the back side of frame.
A ring rail, having a vertical up and down displacement, on which a sliding piece rotates to create the twisting of the thread, is mounted coaxially on the spindle head. Above this ring rail, there is a thread guide having a similar movement but with a different speed. The thread guide guides the different threads towards the sliding piece that comes from the hake box or feeding assembly.
The feeding assembly for each spindle comprises a pair of feeding rollers, an inlet thread roller and a pressure cylinder. The feeding rollers, made preferably of chromed carbon steel, are driven by means of two horizontal shafts, which are also driven, through a flat belt transmission system, by an alternate current motor. The current motor is controlled by a conventional frequency variator. The variator is controlled by a potentiometer. The entire feeding assembly is located in the cabinet. The shafts are made of carbon steel and go through one cabinet to the other, and are supported by the cabinets. One shaft is located vertically above the other, and the shafts are connected to each other by means of a chain that makes them turn in the same direction. The pressure roller is located between the two feeding rollers and exerts a pressure on the thread in order to obtain a better draw. The pressure roller is held by ball bearings. The pressure arm is also fastened by bearings to another vertical shaft placed on top of those supported by the feeding rollers. The pressure arm is allowed to move radially when actuated by a pneumatic piston as to exert more or less pressure on threads moving through the pressure roller and feeding rollers. The pneumatic pistons acting on the pressure rollers of the feeding system in each spindle are driven by the pressured air flow coming from the air pressure piping system, with pressure regulated by a pressure control valve located in the cabinet.
In the modular machine for spinning and doubling with elements for spindle individual transmission with conical or double conical continuous and individual folding system, spindles are the main elements that are in continuous movement, and are able to turn at different speeds. The ring rail has a vertical up and down movement, with the sliding pieces and thread guides turning around and having, as in the case of the ring rail, a vertical up and down movement.
Each spindle turns around its own shaft driven by an alternate current induction motor by means of a belt, preferably of the flat type with interior teeth. Each motor is individually controlled by a frequency variator, of the conventional, vectorial or other type, which is programmed indep
Calvert John J.
Senterfitt Akerman
Welch Gary L.
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