JP2747838B2 - Weft lock pin device for loom - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a shuttleless loom for unwinding and inserting a predetermined length of weft from a drum type weft measuring and storing device at a predetermined time. The present invention relates to a weft locking pin device of a loom to be used.

2. Description of the Related Art In shuttleless looms, a drum type weft length measuring and storing device (hereinafter, simply referred to as a length measuring device) is widely used to measure and store a weft.

A so-called locking pin is used to unwind the weft stored in the length measuring device by a predetermined length at a predetermined time and execute an accurate weft insertion operation. The locking pin moves to and from the surface of the drum that winds and stores the weft so as to take a locking position that prohibits the weft from being unwound from the drum and an unwinding position that allows this. be able to.

The operation of the locking pin is preferably as high as possible in order to stably realize an accurate weft insertion operation corresponding to the high-speed operation of the loom. For this reason, a so-called double solenoid type locking pin is proposed. (Shikai 63
-94986). This is provided with a rod-shaped plunger made of a ferromagnetic material, a locking solenoid that exerts a magnetic force on the plunger, and an unwinding solenoid.
A pin is formed at one end of the plunger, the plunger is driven by alternately exciting the locking solenoid and the unwinding solenoid, and the pin is driven to two positions, a locking position and an unwinding position. Things.

Problems to be Solved by the Invention However, according to the conventional technique, it is necessary to reduce the size and weight of the entire shape in order to realize a high-speed plunger operation. When the shut-off solenoid is arranged in close proximity, the leakage magnetic flux from one solenoid interlinks with the other solenoid via a plunger made of a ferromagnetic material, so that the operation may be unduly slowed. The problem was inevitable. That is, the plunger in this case is inserted in the axial direction of both solenoids in common, and moves along the axis thereof. Therefore, when one of the solenoids is excited, a non- An unnecessary magnetic circuit is formed up to the other solenoid of the excitation, and the mutual inductance between the two solenoids becomes excessive.As a result, the time constant of the solenoid becomes large, the rise of the excitation current is delayed, and the attraction force by the non-excitation solenoid is generated. Therefore, it has been difficult to make the operation of the plunger sufficiently fast because the driving force of the plunger is reduced.

Accordingly, an object of the present invention is to provide a plunger made of a non-magnetic material instead of a ferromagnetic material, and to fix a suction member made of a ferromagnetic material to the plunger by dividing the plunger. Accordingly, it is an object of the present invention to provide a weft locking pin device for a loom which can appropriately suppress mutual inductance between both solenoids and greatly improve overall responsiveness.

Means for Solving the Problems In order to achieve the above object, the present invention provides a locking pin body, a locking solenoid for driving the locking pin body to a locking position, and a locking pin unwinding position. An unwinding solenoid that is driven in a non-magnetic manner. And a pair of ferromagnetic suction members fixed to the plunger on both sides of the stopper.

The plunger may be made of a ceramic bar, and the stopper may be made of an elastic material, and may also serve as a damper.

According to this configuration, a plunger is commonly inserted between the locking solenoid and the unwinding solenoid. However, since the plunger is made of a non-magnetic material, the magnetic resistance between the two solenoids is increased. However, there is no possibility of unduly lowering through the plunger, and therefore, the mutual inductance between both solenoids can be sufficiently suppressed.

If the plunger is made of a ceramic rod, the plunger itself is sufficiently hard, so that the weft can be directly locked by using the tip of the plunger. There is no need to connect to In addition, if the stopper is formed of an elastic material and is also used as a damper, it is not necessary to provide a special damper member for absorbing the impact when the plunger is driven to its stroke limit. Therefore, both can contribute to simplification of the entire structure.

 It works as described above.

Embodiments Hereinafter, embodiments will be described with reference to the drawings.

A weft locking pin device (hereinafter, simply referred to as a locking pin device) of a loom includes a locking pin body 10, a locking solenoid 21,
The unwinding solenoid 22 is used as a main member (FIG. 1),
It is housed integrally in a case composed of a body 23 and a cover 24.

The body 23 has a space 23 for accommodating components including the locking pin body 10, the locking solenoid 21, and the unwinding solenoid 22.
This is a container-like member that forms a space a and a space 23b for drawing out an electric wire from the locking solenoid 21 and the unwinding solenoid 22 (FIG. 2). The bottom of the body 23 is provided with a through hole 23c through which the locking pin body 10 penetrates, and the lower part of the front surface is provided with a tongue piece 23e formed with a mounting hole 23d for accommodating the unwind sensor. It is protruding. Further, a screw hole 23f for screwing the whole to the bracket BK is formed in the upper part of the rear surface. Here, the unwinding sensor is a sensor for detecting a weft (not shown) unwound from the drum D of the length measuring device, and for example, a reflective optical sensor with an optical lens can be used. .

The cover 24 is fixed to the upper surface of the body 23, and has a through hole 24a through which the locking pin main body 10 penetrates, and an electric wire drawing hole 24b.
However, the through holes 24a correspond to the through holes 23c of the body 23, and are respectively located on the axis CL of the space 23a.

The locking solenoid 21 and the unwinding solenoid 22 are accommodated in a space 23a of the body 23 so as to form two layers (FIG. 1). The locking solenoid 21 and the unwinding solenoid 22
They are respectively housed in cylindrical solenoid holders 21a and 22a, and one ends of the solenoid holders 21a and 22a are closed by damper brackets 21b and 22b and face each other via a ring-shaped spacer 25. Damper bracket 21b, 22b
, Ring-shaped dampers 21c and 22c are fixed. The other ends of the solenoid holders 21a and 22a are plunger stoppers.
It is closed by 21d, 22d. Here, the solenoid holders 21a and 22a, the damper brackets 21b and 22b, and the plunger stoppers 21d and 22d are each made of a ferromagnetic material, and the spacer 25 is preferably a non-magnetic material.

The locking pin body 10 has a disc-shaped stopper 12 fitted in the center of a nonmagnetic plunger 11, and further has a stopper 12.
The cylindrical suction members 13, 13 are fixed to both sides of the suction member. The plunger 11 has a through hole 23c of the body 23 and a through hole 24a of the cover 24.
Via the bush 26, 26 inserted into the shaft center CL of the space 23a.
It is movably inserted along. The plunger 11 is made of a non-magnetic material, and for example, it is preferable to use a ceramic bar.

The suction members 13, 13 are made of a ferromagnetic material, and the tip end faces facing the plunger stoppers 21d, 22d are formed on a slope, and at the stroke limit, the plunger stoppers 21d, 22d also formed on the slope are formed. For the tip surface,
It is assumed that they face each other via a minute gap δ. Stopper 12
Is made of a non-magnetic material, and abuts the dampers 21c and 22c when the locking pin body 10 moves to regulate the stroke limit.

The locking pin device having such a configuration is provided via the bracket BK so that the locking pin main body 10 can move forward and backward with respect to the surface of the drum D in the vicinity of the front end surface of the drum D of the length measuring device. It is attached to a length measuring device (FIG. 2). Behind the drum D, a hollow rotating yarn guide D1 is provided,
The weft (not shown) is supplied through the inside of the rotary yarn guide D1 and is wound and stored on the surface of the drum D by the rotation of the rotary yarn guide D1. From the locking solenoid 21 and the unwinding solenoid 22, the connector C
1. Pull out the wires C, C with C1, and connect them to a solenoid drive (not shown).

Now, when the locking solenoid 21 is excited, the locking pin body
10 is driven downward in FIG.
The leading end of the drum 10 enters the surface of the drum D and takes a locking position (solid line in the figure), so that the weft wound and stored on the surface of the drum D is unwound in the direction of arrow K in FIG. It can be prevented from being wound. On the other hand, if the locking solenoid 21 is demagnetized and the unwinding solenoid 22 is excited,
Is driven upward in FIG. 1 to take up the unwinding position (two-dot chain line in FIG. 1), so that the unwinding of the weft from the drum D is permitted. At this time, the number of turns of the weft unwound from the drum D can be measured by an unwinding sensor (not shown) inserted into the mounting hole 23d.

When the locking solenoid 21 is excited, most of the magnetic flux is generated by a magnetic member including a damper bracket 21b made of a ferromagnetic material, a solenoid holder 21a, a plunger stopper 21d, and a suction member 13 on the side corresponding to the locking solenoid 21. Recirculate the circuit. Therefore, if the body 23 and the spacer 25 are formed of a non-magnetic material such as aluminum, for example, the magnetic flux leaking from the locking solenoid 21 can be unwound.
The risk of interlinking up to 22 can be almost completely eliminated.

The same applies to the case where the unwinding solenoid 22 is excited. Therefore, the mutual inductance between the locking solenoid 21 and the unwinding solenoid 22 can be sufficiently reduced. Body 10
Can be extremely responsive.

Another Embodiment The stopper 12 of the locking pin main body 10 can be used as the dampers 21c and 22c in the previous embodiment (third embodiment).
Figure). At this time, the stopper 12 is preferably made of an elastic material made of a non-magnetic material such as hard rubber, nylon, polyethylene, polypropylene, and Teflon (trade name). Since the dampers 21c and 22c can be omitted,
The overall structure can be simplified. Stopper 12
By increasing the thickness, the relative distance between the suction members 13 and 13 can be easily increased without increasing the overall length, so that the mutual inductance between the locking solenoid 21 and the unwinding solenoid 22 is reduced. It is possible to make it even smaller.

In the above description, the plunger 11 of the locking pin body 10
Instead of using the whole as a ceramic bar, only the lower end part used for the locking and unwinding operation of the weft is made of a ceramic material, or only that part, on the surface of any non-magnetic material, Ceramics or a hard material equivalent thereto may be coated. Further, the stopper 12 may be formed integrally with the plunger 11.

Effect of the Invention As described above, according to the present invention, a non-magnetic plunger, a non-magnetic stopper attached to an intermediate portion thereof, and a pair of strong members disposed on both sides of the stopper and fixed to the plunger. By combining the locking pin body composed of a magnetic attraction member, the locking solenoid and the unwinding solenoid, leakage magnetic flux generated when one solenoid is excited is linked to the other solenoid. Since the solenoids can be effectively prevented, the mutual inductance between the two solenoids can be suppressed sufficiently small, and therefore, the responsiveness of the entire operation is significantly reduced as compared with the case where the plunger is integrally formed of a ferromagnetic material. And a stable weft insertion operation that can sufficiently cope with the high-speed operation of the loom has an excellent effect.

[Brief description of the drawings]

1 and 2 show an embodiment, FIG. 1 is an explanatory view of a central longitudinal section, and FIG. 2 is an explanatory view of a use state. FIG. 3 is a diagram corresponding to FIG. 1 showing another embodiment. 10 Locking pin body 11 Plunger 12 Stopper 13 Suction member 21 Locking solenoid 22 Unwinding solenoid 21c, 22c Damper

Claims (3)

(57) [Claims] A locking pin main body, a locking solenoid for driving the locking pin main body to a locking position, and an unwinding solenoid for driving the locking pin main body to an unwinding position; The pin body includes a non-magnetic material plunger movably inserted into the locking solenoid and the unwinding solenoid, a non-magnetic material stopper attached to an intermediate portion of the plunger, and A weft locking pin device for a loom, comprising a pair of ferromagnetic suction members fixed to a plunger. 2. A weft locking pin device for a loom according to claim 1, wherein said plunger is made of a ceramic bar. 3. The weft locking pin device for a loom according to claim 1, wherein said stopper is made of an elastic material and also serves as a damper.