JPS6183343A - Tab forming apparatus in shuttleless loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a selvedge forming device for a shuttleless loom, and more particularly to a selvedge forming device for weaving selvedges in a shuttleless loom.

A cam is not used as the drive source for the vertical and horizontal relative movement of the needle for inserting the ground selvage yarn and the yarn finger for inserting the plucked selvage yarn, and one rotational motion is converted into reciprocating motion using an eccentric bushing and an inclined rotary bushing. The present invention relates to a selvedge forming device that weaves selvedges.

(Prior art and its problems) Conventionally, this type of selvage forming device has two mechanisms: vertical movement of a needle through which the ground selvage thread is inserted, and vertical and horizontal relative movement of yarn fingers through which the rounded selvage thread is inserted. The actuating source is derived from the movement of the heald frame (for example, the
16694) and one in which the drive source for the needles and yarn fingers is not taken from the heald frame but is driven by an independent cam (for example, Japanese Patent Publication No. 50-39181) has been proposed.

However, in the former case, since the drive source is derived from the heald frame, not only is it not possible to arbitrarily select the closing timing, but also it is not possible to set a difference in the closing timing of the left and right heddle devices, and for this reason, the weft +i ! There is a drawback that the weft yarn conveyed by the conveying body and the selvedge yarn come into contact with each other, causing damage to the yarn. Therefore, as a solution to this drawback, the drive source is not taken from the heddle frame but from a separate cam, which has the advantage of being able to close the shelved selvage threads after the weft has been completely inserted. However, not only does it take a lot of time to make the cam, but because a spring is used as a source of movement from side to side for the yarn finger through which the selvedge yarn is inserted, it was not a big problem when the loom rotation speed was around 25 Orpm. When the rotation speed of the loom increases to 350 rpm or higher, a new problem arises in that the movement of the fingers overruns at the motion conversion point, making it impossible to accurately weave the selvedges.

(Purpose) Therefore, the present invention aims to solve the above-mentioned drawbacks, and its purpose is that even if the loom rotation speed is increased to 35 Orpm or higher, the upper and lower parts of the needle and yarn fingers,
It is an object of the present invention to provide an ear-forming device that quickly ensures the relative movement of the left and right sides, thereby making it possible to weave beautiful plucked ear tissue.

(Solution Means) In order to achieve the above object, the present invention comprises the following means. That is, as a driving source for relatively moving a pair of yarn fingers in the left-right direction through which the selvedge yarn is inserted, an inclined rotary bushing having an outer diameter inclined with respect to its rotation axis is used to simultaneously move the pair of yarn fingers up and down. As a drive source for moving the yarn, an eccentric bushing eccentric to the rotation axis is provided, and the needle through which the ground selvage yarn is inserted is moved up and down by the eccentric bushing in synchronization with the pair of yarn fingers and in opposite phases. It is characterized by having the following configuration.

(Embodiment of the present invention) Next, an example of a device for carrying out the present invention will be described in detail with reference to the drawings. Reference numeral 1 denotes a rotating shaft that rotates in synchronization with the loom main body, and a timing pulley 2 is fixed to the rotating shaft. ing. 3
is a timing belt that engages with the timing pulley 2; 4 is a rotating shaft whose intermediate portion is rotatably attached to a support frame 5; a timing pulley 6 that engages with the timing belt 3 is attached to one end of the rotating shaft; A timing pulley 7 is fixed to the other end, and an eccentric bushing 8 is fixed adjacent to the pulley 7. The eccentric bush 8 is mounted eccentrically with respect to the axis of the rotating shaft 4, and has a needle 15 (described later) through which the ground selvage thread is inserted and a front finger 20 through which the selvedge thread is inserted.
and a bank finger 21 (both of which will be described later) serve as a driving source for vertical movement, and one end of a link lever 9 is rotatably and loosely attached to the outer diameter of the eccentric bush.

10 is an L-shaped lever fixed to a shaft 11 rotatably attached to the support frame 5; a bottle 12 is fixed to the short end of the lever; One end is rotatably attached, and a thread guide rod 13 is attached to the longer end, and a needle 15 is fixed below this rod 13 by a bolt 14. The needle 15 has a guide hole 15a at its tip, through which the selvage thread is inserted. A rotation shaft 16 is rotatably attached to the support frame 5, and a timing pulley 17 and an inclined rotary bush 19 are fixed to the rotation shaft.

(See FIGS. 1 and 2) The timing pulley 17 is disposed between a portion of the support frame 5 that is formed in an approximately inverted U-shape, and is connected to a timing pulley fixed to the rotating shaft 4. 7 and has a gear ratio of 2:1. IB
are the timing pulley 7 and the timing pulley 17.
It is a timing belt with one wheel inserted between it.

As shown in FIG. 6, the tilted rotary bushing 19 is formed such that the central axis PP' of its outer diameter is not concentric with respect to the axis 00' of the rotary shaft 16, but is slightly inclined.

Therefore, the bushing has an outer diameter inclined with respect to its axis of rotation, and as shown in FIG. Keep it up.

A front finger 20 and a bank finger 21 having a guide hole through which the pruning selvage thread is inserted are rotatably and loosely attached to the outer diameter portion of this inclined rotary bushing 19, and the rotational movement of this inclined rotary bushing 19 causes the pruning selvage thread to be passed through the front finger 20 and bank finger 21. This converts the movement of the front finger 20 and bank finger 21 into a relative movement in the left and right direction. (Figures 4 and 5
(See figure) The front finger 20 and the hack finger 21 have their tip portions bent into an L-shape.

A guide hole 20a through which the selvedge thread is inserted into this bent tip.
. 26, 26' are attached, and these two fingers 20.2] are attached to the pin 2 with the link 25 in between.
2 is slidably and loosely attached. A lever 23 is fixed to the shaft 11, and a pin 24 is fixed to the tip of the lever. Reference numeral 25 denotes a link, one end of which is rotatably attached to the pin 24, and the other end is attached to the pin 22.
is fixed.

27 is a yarn guide, which is fixed to the support frame 5, and the support frame 5 is connected to the machine frame 28 by bolts 29.
is fixed.

An example of a device for carrying out the present invention is constructed as described above, and its operation will be explained first.Firstly, the downward movement of the needle 15 through which the ground selvage thread is inserted will be described. When the timing pulley 6 is driven from the loom main body through a suitable transmission means, the timing pulley 6 is driven through the timing pulley 2 and the timing belt 3. When the timing pulley 6 is driven, the shaft 4 is driven, so that the eccentric bush 8 fixed to the shaft 4 rotates. Since this eccentric bushing 8 has an outer diameter that is eccentric to the center of the shaft 4, the link lever 9 is given a reciprocating motion in the left-right direction in FIG. Therefore, the L-shaped lever 10, which is rotatably attached to the support frame 5 and has the shaft 1 as a fulcrum, rotates alternately in forward and reverse directions by the reciprocating movement of the link lever 9. As a result, the needle 15 attached to the tip of the lever is given vertical movement as shown by the arrow.

Next, we will explain the action of the front finger 20 and the bank finger 21 through which the selvage thread is inserted.The nine fingers move up and down in the opposite phase in synchronization with the up and down movement of the needle 15, and also move relatively in the left and right direction. First of all, let's talk about the movement in the vertical direction. When the reciprocating movement in the left and right direction of the link lever 9 is converted into an alternating forward and reverse rotational movement with the shaft 11 of the L lever 10 as a fulcrum,
The lever 23 fixed to the shaft 11 uses a shaft 16 rotatably attached to the support frame 5 as a fulcrum.

The lever 23. Pin 24. Via the link 25, the finger 20.21 is given a vertical movement as shown by the arrow. At this time, the vertical movement of the needle monthly rate 5 and the -1-downward movement of the fingers 20 and 21 are completely opposite vertical movements. That is, when the tip of the L-shaped bar 10 now rotates clockwise (downward) using the shaft 11 as a fulcrum, the lever 23 rotates clockwise using the shaft 11 as a fulcrum, and therefore, with the shaft 16 as a fulcrum. finger 20.2
] is lifted and moves counterclockwise.

Next, to describe the relative movement of the fingers in the left and right direction, when the rotating shaft 1 is now driven, the timing pulley 2
．． Timing belt 3. shaft 4 through timing pulley 6
is driven. Since a timing pulley 7 is fixed to this shaft 4, the timing pulley 17 is driven via a timing belt 18 that is placed around this timing pulley 7. Since the rotating shaft 16 is fixed to the timing pulley 17, the shaft 16 rotates.

For this purpose, the tilting rotary bushing 1 mounted on this shaft 16
9 is rotated. When the inclined rotary bushing 19 rotates, the selvage thread guide holes 20a and 21a at the tips of the front finger 20 and bank finger 21, which are loosely attached to the outer diameter of the shaft, are opened as shown in FIGS. 4 and 5. In the figure, it moves relatively in the left and right direction as shown by the arrows. That is, the root parts 20b, 21b of both fingers 20 and 21
When the upper side surface of is brought closer by the rotation of the tilting rotary bushing 19.

As shown in FIG. 4, the tips of the fingers intersect, and when the upper side surfaces of the root parts 20b and 21b of both fingers 20 and 21 are separated by the rotation of the inclined rotary bushing 19, As shown in FIG. 5, the tips of both fingers 20, 21 also move apart.

Next, the formation of the pruning ears will be explained in detail with reference to FIGS. 8 to 11. FIG. 8 shows the needle 15 just before moving from the bottom dead center of the descending process to the ascending process. At this time, the front finger 20 and the back finger 21 are conversely shown when they are just before transitioning from the top dead center of the ascending process to the descending process, and here, the selvedge thread S2° S3 is is opened, and the weft is inserted here. The state shifts to FIG. 9 from this state. FIG. 9 shows a diagram when the needle 15 is at the top dead center and some of the front finger 20 and the bank finger 21 are at the bottom dead center. At this time, the front finger 20 moves to the right, while the bank finger 21 moves to the left. For this reason, the selvedge thread S2. S3 intersects under the ground selvage thread S1. That is, the front finger 20 is at the right end, while the bank finger 21 is at the left end. Thereafter, the needle 15 again enters the downward process, while the front finger 20 and the hack finger 21 enter the upward process and shift to the state shown in FIG. FIG. 10 shows a state in which the needle 15 is at the bottom dead center, the front finger 20 and the hack finger 21 are at the top dead center, and a new weft is inserted in this state. Next, the needle 15 moves up, while the front finger 20 and bank finger 21 move down to the state shown in FIG. In this FIG. 11, the front finger 20 has moved to the left, while the back finger 21 has moved to the right, so that the plucked selvage thread S2
．． 33 intersects under the ground selvage thread S1.

By repeating the above-mentioned actions, the rim of the selvedge is formed.

(Effects) As described above, the present invention is provided with an inclined rotary bushing that relatively moves the pair of yarn fingers in the left and right direction through which the twisted selvage thread is inserted, and an eccentric bush that simultaneously moves the pair of yarn fingers up and down. At the same time, the needle through which the ground selvage yarn is inserted is moved up and down by the eccentric bush in synchronization with the pair of yarn fingers and in opposite phases, so that the labor-intensive manufacture of a cam can be omitted compared to conventional devices. At the same time, even when the loom speed is increased to 35 Orpm or more, the rotational motion can be smoothly converted into vertical and horizontal reciprocating motion of the needle and yarn fingers, and beautiful selvedges can be woven with no noise and extremely accurately. At the time of change, the relationship between the finger and the needle can be left as is when moving, so adjustments can be made extremely easily.

[Brief explanation of the drawing]

FIG. 1 is a front view of essential parts showing an example of an apparatus for carrying out the present invention, FIG. 2 is a sectional view taken along line xx' in FIG. 1, and FIG. 4 and 5 are partially enlarged views of FIG. 2, FIGS. 6 and 7 are sectional views showing an example of a tilting rotary bushing, and FIGS.
FIG. 1 shows a perspective view of essential parts for explaining the operating state of the device of the present invention. 8-----One eccentric bush 15-----Needle 15a -m-Guide hole 19----One inclined rotation push 20----Front finger 20a-Guide hole 21--One --Back finger 5L---
Single selvage thread 21a-/Guide hole S2. S3-Striped selvage thread

Claims (1)

[Claims] At least three selvage threads are divided into one ground selvage thread and two selvedge threads, and the thread paths of the two selvedge threads are alternately exchanged to weave the selvedge threads. In a selvage forming device for a shuttleless loom, a needle having a guide hole through which the selvage thread is inserted is attached to an eccentric bushing which is fixed eccentrically to the axis of a rotating shaft driven from the loom body through an appropriate transmission means. An inclined rotary bush that is movable in the vertical direction via an appropriate link mechanism as a drive source, and has a pair of yarn fingers each having a guide hole through which the selvedge yarn is inserted, and whose outer diameter is inclined with respect to the axis of rotation. is provided so as to be relatively movable in the left-right direction as a driving source, and the pair of yarn fingers are connected to a link mechanism to which the needle is attached, so as to move up and down in synchronization with the needle and in opposite phases. Features: A selvedge forming device for shuttleless looms.