Textiles: weaving – Special-type looms – Irregular warp feed
Reexamination Certificate
2000-02-14
2001-02-13
Falik, Andy (Department: 3741)
Textiles: weaving
Special-type looms
Irregular warp feed
Reexamination Certificate
active
06186187
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pile forming apparatus of the cloth moving type, capable of moving at least cloth or woven fabrics in a terry loom.
2. Description of the Prior Art
A terry loom for weaving woven fabrics having piles such as a terry towel includes, in general, a pile forming apparatus which can vary the positional relation between a reed and a cloth fell, that is, the positional relation between a so-called fast pick position (first pick position) for forming pile by beating a weft toward the cloth fell (i.e. a beating position for beating the weft to bring it into contact with the cloth fell) and a so-called loose pick position (second pick position) for just moving wefts up to a position at a certain distance from the cloth fell (i.e. a half beating position for beating wefts to move them up to a position at a certain distance from the cloth fell).
As an example of the pile forming apparatus of this kind, U.S. Pat. No. 5,392,817 (Japanese Patent Application Public Disclosure (KOKAI) No. 5(1993)-156546) discloses a cloth moving type pile forming apparatus in which woven fabrics are moved with respect to a reed by means of a cloth moving member. In this apparatus as disclosed, the following system is employed for moving the woven fabrics. The first swing lever (a roller lever) is swung by a negative motion cam mechanism which is driven in synchronism with rotation of the main shaft of a loom. The swing motion of this first swing lever is then transmitted to a coupling hook detachably connected with the first swing lever, further transmitted to the second swing lever (driving lever) through a sliding ring connected with the above coupling hook, and finally transmitted to a woven fabric table as the cloth moving member by the second swing lever.
In the pile weaving operation according to the above prior art system, the first swing lever and the coupling hook are connected with each other, thereby moving the cloth moving member in the warp running direction (referred to as “front and back direction” hereinafter), from the fast pick position to the loose pick position or vice versa according to a weaving plan or design. With this, the cloth fell is moved from the fast pick position to the loose pick position or vice versa according to a weaving plan or design.
Contrary to this, in the weaving operation other than the pile weaving operation (for example ordinary cloth weaving, border weaving), the first swing lever is detached from the coupling hook, thereby holding the cloth moving member and the cloth fell in the fast pick position. With this, the pile length would be kept almost zero.
In the prior art system as described above, however, when the first swing lever and the coupling hook are detached from each other, it is required to additionally provide a stopper which can receive and stand a load imposed to the entire system, for instance, the load in the form of the tension applied to the warp and the woven fabric as well, the reaction force caused by the beating motion, and so forth. This results in enlargement in the scale of the apparatus.
Therefore, in the cloth moving type pile forming apparatus, it is desirable to make the scale of the apparatus as small as possible.
SUMMARY OF THE INVENTION
A cloth moving type pile forming apparatus according to the invention comprises: a driving mechanism driven in synchronism with the rotation of the main shaft of a loom; a cloth moving member for moving woven fabric with respect to a reed; a transmission mechanism having a pair of swing levers which are connected with each other by means of a connection body, the connecting position therebetween being made variable, one of the paired swing levers being driven by the driving mechanism and the other thereof being coupled with the cloth moving member; and a position change device capable of changing the connecting position between at least one of the paired swing levers and the connection body, from at least one first position corresponding to an effective lever length enabling piles to be formed, to a second position corresponding to the effective lever length being unable to form any pile, or vice versa according to a weaving plan or design.
In the pile weaving operation, the connecting position between at least one of the paired swing levers and the connection body is changed to the first position by means of a position change device and is held therein. With this, the swing motion of the one swing lever is transmitted to the other swing lever, the cloth moving member is changed from the fast pick position to the loose pick position or vice versa according to a weaving plan or design.
Contrary to this, in the weaving operation other than the pile weaving operation, the connecting position between at least one of the paired swing levers and the connection body is changed to the second position by means of the position change device and is held therein. With this, the swing motion of the one swing lever is hardly transmitted to the other swing lever, so that the cloth moving member is held in the fast pick position, thus no pile being formed.
According to the invention, even in the weaving operation other than the pile weaving operation, since a pair of swing levers are connected with each other while one of them are connected with the driving mechanism, a load imposed to the entire system, for instance, the load in the form of the tension applied to the warp and the woven fabric as well, the reaction force caused by the beating motion and so forth, is received by the driving mechanism so that there is no need to additionally provide such a stopper that was required in the prior art. Therefore, the apparatus is not enlarged in the scale.
The above position change device can change the connecting position between at least one of the paired swing levers and the connection body to one first position selected from a plurality of available first positions. With this, the pile length may be made variable. The driving mechanism may be provided with a cam mechanism, especially a positive motion cam mechanism.
One of paired swing levers includes a guide portion extending in one direction, the connection body is connected with the guide portion movably in the longitudinal direction of the guide portion and is also pivotally connected with the other of the paired swing levers, thereby connecting both of the paired swing levers together, and the position change device includes a mechanism for moving the connection body which moves the connection body with respect to the above one swing lever in the longitudinal direction of the guide portion.
Both of the paired swing levers respectively include a guide portion extending in almost the same direction, the connection body is connected with both of the guide portions movably in the longitudinal direction of the guide portions, thereby connecting both of the paired swing levers with each other, and the position change device includes a mechanism for moving the connection body which moves the connection body with respect to both of the paired swing levers in the longitudinal direction of the guide portions.
REFERENCES:
patent: 4569373 (1986-02-01), Vogel
patent: 5058628 (1991-10-01), Spiller et al.
patent: 5458160 (1995-10-01), Geiger et al.
patent: 5518037 (1996-05-01), Takahashi et al.
patent: 22 25 604 (1973-07-01), None
patent: 44 32 452 (1995-03-01), None
patent: 0 518 809 (1992-12-01), None
patent: 7-90750 (1995-04-01), None
Christensen O'Connor Johnson Kindness PLC
Falik Andy
Tsudakoma Kogyo Kabushiki Kaisha
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