JPH0718062B2 - Roving cutting method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a roving cutting method. More specifically, the present invention relates to a method of cutting a roving yarn so that the cut end portion has a short writing brush shape by giving a twist to the roving yarn.

[Problems to be Solved by the Prior Art and Invention] The roving yarn may be cut due to piecing in a spinning machine. Conventionally, this kind of roving has been cut by manually holding the roving at intervals and separating the roving so that the holding point is moved away. On the other hand, in order to rationalize the spinning process, a method of mechanically cutting the roving is demanded and proposed. However, these mechanical methods are in principle not much different from the above-mentioned methods. For example, in the device of Japanese Patent Publication No. 47-51649, which is the same applicant as the applicant of the present invention, the shinobi supplied from the shinomaki bobbin is sucked into the suction conduit, and the shin is grasped by a comb provided at the mouth of the suction conduit. On the other hand, on the upstream side of the suction conduit, the Shinobu bobbin is grasped by a pair of clamping rods, and then the suction conduit is moved away from the clamping rod to apply tension to the grasped Shino. And pull and cut at about the middle point.

In this way, if the fibers are cut only by pulling, the fibers that are trying to escape from the holding point may get entangled with the fibers that are being held due to the twist that is added to the roving, or the fibers that are in the process of leaving may get entangled. A few fibers that have fallen from the holding point hang down long on the tip of the roving cut into a writing brush. The length and number of the several fibers that hang down change every time the fiber is cut, and the length of the tip of the writing-tip-shaped fiber from the holding point increases and the length greatly varies and is not constant. When it is done by hand, it is possible to pinch a few fibers hanging down from the cutting tip and pull away the fibers entangled in the middle of pulling 2 to 3 degrees to align the roving ends in the shape of a brush with a substantially fiber length. This work cannot be done mechanically. Therefore, if you try to superimpose a roving that has been cut only by tension on another roving that is being spun, the hanging roving tip may bend and cause a splicing error, or a splicing may occur. Also, there is a problem in that the broken fibers are mixed into the roving after the piecing, which causes yarn breakage during yarn formation.

It is an object of the present invention to provide a roving thread cutting method that solves the problems of the conventional roving thread cutting method and can obtain a short brush-shaped cutting end portion, thereby enabling reliable piecing. And

[Means for solving problems]

An object of the present invention is to hold a predetermined roving yarn at two points with a gap, and press a pressing member relatively to the roving yarn between the two points so as to apply tension while rolling the roving yarn. According to the roving yarn cutting method, the twisting of the roving yarn between the pressing member and one of the holding points is returned to cut the roving yarn so as to be loose.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings.

FIGS. 1 (a), (b) and (c) show stepwise embodiments of the roving cutting method according to the present invention. The roving 1 to be cut as shown in FIG.
And the lower holder 3 are held. This upper holder 2
The lower holding tool 3 and the lower holding tool 3 may be of any structure as long as they can hold the roving 1 at an interval. For example, a nip roller, a scissor-shaped holding tool, and a comb-shaped member are used. May be.

A pressing member 4 is arranged so that it can move in the direction indicated by arrow A with respect to the side surface of the roving yarn 1 whose both ends are held (FIG. 1 (a)), and the roving yarn side end face 5 of the pressing member 4 is the second end. As shown in FIG. 3A, the sloping portion is formed so as to be inclined with respect to the traveling direction. The slanted end surface 5 is formed on the roving 1 as described later.
Since it is rolled, it is formed of a high friction member such as rubber or a metal plate with knurls. Then the first
As shown in FIGS. 2B and 2B, when the pressing member 4 advances in the direction indicated by the arrow A and the slanted end face 5 of the roving 1 comes into contact with the roving 1, the roving 1 moves to the arrow B (see FIG. As shown in b)), it rolls on the inclined end surface 5 and bends in a dogleg shape.
As a result of the rolling of the roving yarn 1, as shown in FIG. 2 (b), the roving yarn portion 1b between the pressing member 4 and the lower holding tool 3 rolls in addition to the original twist of the roving yarn 1. Twist is added. On the other hand, between the pressing member 4 and the upper holding tool 2, the roving yarn portion 1a, on the contrary, the twist of the roving yarn 1 is returned, and the twist becomes more gentle. Thus, when the pressing member 4 further advances, the roving yarn 1 is pulled to further increase the degree of bending, and the twist return in the roving yarn portion 1a proceeds, and the roving yarn portion 1a is cut so as to pull out the roving yarn 1. As shown in Fig. 1 (c), the two parts 1a'1a "are pulled apart to form a very short writing brush-like end portion. The description of Figs. In the case where the twist is Z twist, but if the twist of the roving yarn is S twist, the pressing member 4 may be used in the opposite manner to the above. Also, in FIG. If so, the inclined surface of the pressing member shown in FIGS. 2A and 2B may be used in reverse, that is, arranged on the upper side.

The distance between the two holding points where the pressing member is pressed and the distance between one holding point, for example, the distance between the pressing member 4 and the lower holding tool 3 in the case of FIG. When the position is determined to be 1 to 2 times the average fiber length of the constituent fibers, the ends of the cut roving yarns are formed in a short writing brush shape, and the length of the writing brush end is always kept constant. It will be.

As for the relative movement of the pressing member 4 with respect to the roving yarn 1, as shown in FIGS. 1 and 2, various moving methods other than the moving method of linearly pushing the roving yarn 1 in the direction perpendicular to the roving yarn 1 are adopted. You can For example, the pressing member may be rotated in a plane intersecting with the axis of the roving yarn 1, whereby the pressing member may apply tension while rolling the roving yarn, or may be held by a fixed pressing member at predetermined intervals. You may press the crocheted thread.

FIG. 3 shows another embodiment in which the present invention is applied to a Shino exchange machine which runs along the machine frame of a spinning machine to perform Shino joint and Shino exchange. The Shino exchange 40 shown in this drawing is a Shinobaki bobbin suspended from a bobbin hanger 22 of a creel of a spinning machine.
When the small bobbin 6c becomes 6c and the full bobbin 6a hung in the spare bobbin hanger 21 of the spare rail 19 in advance, and the roving R during spinning of the small bobbin 6c This is an automatic operation of connecting the roving thread that has come out from the full bobbin 6a, and was originally developed by the applicant of the present invention.
It is described in detail in Japanese Patent Application No. 60-193919 filed on September 4, 1960. The Shino exchange 40 is equipped with a Shino joint head 11 as a holding means and a suction nozzle 7 together with the pressing member 4, and these cooperate to carry out the roving cutting method according to the present invention.

In FIG. 3, 6a is a full bobbin, 6b is a medium bobbin, 6c is a small bobbin, 15 is a spinning machine base, 16 is a creel pillar, 9
Is a drafting part, 10 is a trumpet, and 17 is a roving guide 8.
Mounting bracket for the support frame 14 that supports
Is a Shino exchange machine that moves on rails 12 and 12, 18 is a support bracket, 19 is a spare rail, 20 is a spare bobbin carriage, and 21 is a spare bobbin carriage.
Is a spare bobbin hanger, 22,22 'is a bobbin hanger, 25
Is a spindle, 26 is a spindle rail, 28 is a guide rail fixed to the spindle rail 26 by a mounting bracket 27, and 30 is a guide pin. The Shino exchange 40 can be moved along the front surface of the spinning machine by the wheels 41a and the guide rollers 29. Into the main body 41 of the Shino exchange 40, a suction nozzle 7 for ejecting Shino from the full bobbin 6a and a Shinotsu head 11 for connecting Shino of the full bobbin 6a to the Shino of the small bobbin 6c being spun are pressed. It is arranged together with the member 4. As shown in FIG. 4, the pressing member 4 is arranged so as to be vertically movable in front of the forward end of the connecting head 11 in the traveling direction. The Shino exchange 40 further includes a peg 44 that supports the full bobbin 6a on the peg bar 46, a full bobbin exchange head 42 that moves the full bobbin 6a up and down, and a peg 45 that supports the small bobbin 6c on the peg bar 47, Small ball bobbin exchange bed 43 that moves the small ball bobbin up and down, back and forth
Further, a shining plate 48 for accommodating the roving on the roving guide 27 is accommodated.

FIG. 4 is an enlarged view showing the relationship between the pressing member 4, the shin joint head 11 and the suction nozzle 7 in FIG. Therefore, the operation of the Shino exchange to reach the state shown in FIG. 4 will be described first with reference to FIGS. 3 and 4.

First, as shown in FIG. 3, the bobbin hung on the bobbin hanger 22 in the front row of the creel of the spinning machine becomes a small bobbin 6c as the spinning progresses, and the bobbin hung on the bobbin hanger 22 'in the rear row. When the inner ball bobbin 6b is reached, the Shino exchange 40 is attached to the spinning machine. At that time, the guide roller 29 of the Shino exchange 40 is placed on the guide rail 28 of the spinning machine. At this time, the bobbin hangers 22 in the front row of the spinning frame were previously placed on the spare rail 19 of the spinning frame.
The full bobbin 6a is suspended from the spare bobbin hanger 21 arranged facing the position. As shown in FIG. 4, the small bobbin 6c in the front row has a small amount of remaining Shinobu, and when the Shinobu needs to be replaced, it is directly below the full bobbin 6a hung on the bobbin hanger 21 of the spare rail 19. The corresponding full bobbin replacement head 42 rises and the full bobbin replacement head peg
44 fits under the full bobbin 6a and is removed from the bobbin hanger 21 of the full bobbin 6a. The full bobbin exchange head 42 on which the full bobbin 6a is placed descends and returns to the position shown by the chain double-dashed line in FIG.
Further, as the full bobbin changing head descends, the outlet nozzle 7 ascends as shown by an arrow C, and the full bobbin 6a ′ descends.
The outlet nozzle 62 stops at a position where the suction port of the outlet nozzle 7 corresponds to the height position of the tip of the full nozzle, and the full bobbin 6a is viewed from above by a peg rotation mechanism (not shown) built into the full bobbin replacement head. Rotation counterclockwise, the suction mechanism is activated, and
Sent Shino of 6a. While continuing the rotation of the full bobbin 6a and the suction of the outlet nozzle 7, the outlet nozzle 62 descends,
Returning to the original position shown in the figure, the shino, which is exposed at that time, enters the shino guide groove 52 of the shinotsugu head 11.

As shown in the plan view of FIG. 6 (a) and the front view of FIG. 6 (b), the Shino joint head 10 has a Shino joint head main body 51 having a roving guide groove 52 and a roving holding surface 57 at its tip. And fulcrum on body 51
The nip lever 53 is arranged so as to be swingable around a center 54 and has a roving holding surface 58 at its tip. Nip lever
The rear portion of 53 is connected to a rod 55 that can reciprocate via a pin 56. By reciprocating the rod 55, the roving thread holding surface 58 of the nip lever 53 is moved to the roving thread holding surface of the Shino joint head main body 51.
By abutting against 57, the roving thread inserted from the groove 52 can be gripped.

The roving yarn 1 downstream of the Shinotsuji head 11 is sucked by a suction nozzle, and is further provided in a pipe near the suction port 7b of the suction nozzle 7 as shown in Japanese Patent Publication No. 47-51649. Held by comb 7a. Comb
7a is formed so that the roving 1 is easily disengaged on the suction side of the suction nozzle 7, and the roving 1 is locked on the full bobbin 6a side. Thus, the roving 1 is in the state of FIG.
It is held at two points of 10 and the comb 7a of the suction nozzle 7.

As shown in FIG. 5, the pressing member 4 in this embodiment has a flat plate 4a having an inclined end surface 5 on one side and a lever 4a fixed to one end and rotatably arranged about the shaft 4e at the other end. Composed of 4d. The protruding portion 4b on the side farther from the axis 4e of the inclined end surface 5
And a hook 4c is formed on the shaft 4e side of the protrusion 4b. A rubber layer is attached to the inclined end surface 5.

Next, the operation of the roving cutting method according to the present invention will be described with reference to FIG. FIG. 7 is a side view taken along the line VII-VII in FIG. 5 and shows the steps of operation in a simplified manner. FIG. 7 (a) corresponds to the states shown in FIGS. 4 and 5.

By rotating the shaft 4e in the direction shown by the arrow A (the fifth
(Fig.) The inclined end surface 5 of the pressing member 4 comes into contact with the roving 1. When the pressing member 4 is further rotated and the pressing member 4 is advanced to the position indicated by the chain double-dashed line in FIGS. 7 (b) and 5, the inclination of the pressing member 4 as already described in FIGS. 1 and 2. When the roving yarn 1 rolls on the end face 5 and, as a result, the roving yarn 1 is Z twisted, it is twisted in the roving yarn portion 1b in FIG. 7 (b) and untwisted in the roving yarn portion 1a. At the same time, the roving yarn 1a and the roving yarn 1b are extruded by the pressing member 4 and pulled. When the pressing member 4 further rotates, the twisting of the roving yarn in the roving yarn portion 1a decreases, and as a result, the tensile force applied to the roving yarn 1 causes the roving yarn 1 to have fibers in the roving yarn portion 1a on the side of the hinoki joint head 11. Then, the two parts on the pressing member 4 side are lightly pulled out, separated, and cut. At this time, the roving yarn portion 1b is twisted to increase the roving yarn strength, so that the roving yarn 1 does not come off at this portion. The roving portion on the side of the cut Shinotsuji head 11 has a short brush-like shape because the fibers are lightly pulled out in the untwisted state as described above.
Since it is securely housed in the groove 52 and the cutting end is short, it is possible to perform good Shinotsugi. In this state, the roving joining operation with the roving from the small bobbin in the next step is prepared. On the other hand, the roving thread portion reaching the suction nozzle 7 side from the pressing member 4 is sucked into the suction nozzle 7 by the suction force of the suction nozzle 7.

When the roving 1 rolls on the inclined end surface 5 of the pressing member 4,
The roving 1 may come off the flat plate 4a, but since the flat plate 4a is provided with a hook 4c as shown in FIG. 5, the roving 1 is on the inclined end surface 5 until the roving 1 is cut by the hook 4c. As a result, the roving 1 can be reliably cut.

〔The invention's effect〕

As described above, in the present invention, the pressing member is relatively pressed against the roving yarn held at two points to impart rolling motion and tension to the roving yarn to twist the roving yarn between the pressing member and one holding point. Since the roving yarn is cut back so that the roving yarn is pulled out, the fiber between the pressing member and one holding point can be pulled out with little entanglement, and the roving yarn end on the one holding point side can be roughly fiber length. It is possible to arrange it with a short brush tip shape, which prevents the tip of the roving end from bending when superposing the roving end on the roving that is being introduced into the trumpet of the spinning machine and splicing. It is possible to perform the sino-joint operation satisfactorily. Further, since the rolling motion and the tension are applied to the roving yarn by the pressing of the pressing member as described above, the roving yarn can be implemented by an extremely simple means and can be easily incorporated even in a narrow space of an automatic machine.

[Brief description of drawings]

FIGS. 1 (a), (b) and (c) are front views for explaining each step in carrying out the roving yarn cutting method according to the present invention, and FIGS. 2 (a) and (b) are rough views according to the present invention. Sectional drawing which shows the relationship between the pressing member and roving thread used when implementing a thread cutting method,
FIG. 3 is a sectional view showing the relationship between a spinning machine and a Shino exchange equipped with a pressing member, Shino joint head and suction nozzle used to carry out the roving cutting method according to the present invention, and FIG. 4 is FIG. FIG. 5 is an enlarged cross-sectional view showing the relationship between the pressing member, the Shino joint head, and the suction nozzle in FIG. 5, FIG. 5 is a front view showing the positional relationship between the pressing member, the Shino joint head, and the suction nozzle before cutting the roving, FIG. a) is a plan view of the Shinotsu head, FIG. 6 (b) is a front view of the Shinotsu head, FIG. 7 (a), (b),
(C) is a side view showing a positional relationship among the pressing member, the connecting head, and the suction nozzle at each stage when carrying out the roving cutting method according to the present invention. 1 ... roving yarn, 1a, 1b ... roving yarn portion, 2, 3 ... roving yarn holder, 4 ... pressing member, 5 ... inclined end face, 7 ... suction nozzle, 10 ... Shino joint head.

Claims (2)

[Claims] 1. A roving is held at two points at a predetermined interval,
A pressing member is relatively pressed against the roving yarn between the two points to apply tension while rolling the roving yarn, thereby returning the twist of the roving yarn between the pressing member and one holding point to return the roving yarn. A method for cutting roving, characterized in that it is cut so as to pull out. 2. The method according to claim 1, wherein the distance between the pressing member and one of the holding points is set to 1 to 2 times the average fiber length of the fibers constituting the roving.