JP2994663B2 - Loom opening forming device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an improvement in an opening forming device for a loom, particularly for a jacquard machine.

(Prior Art) In a jacquard machine, a reciprocating knife is engaged with a needle connected to a fine cord, and when the knife is raised, the needle is selectively engaged with a needle holder to open (open) the knife. ) Is formed.

In forming the opening, the engagement of the needle with the needle holder often utilizes the attractive force of the electromagnet (for example, see Japanese Patent Application Laid-Open No. 61-2253).
No. 43, JP-A-59-199833, JP-A-62-62945
Reference, JP-A-59-26543, etc.).

(Problems to be Solved by the Invention) By the way, in order to ensure that the engagement of the needle with the needle holder is smoothly performed and that the attraction force of the electromagnet (hereinafter, referred to as a solenoid) is as small as possible, During the reciprocation of the needle, the needle is guided to bend toward the needle holder.

However, forcibly bending or rubbing in the process of raising and lowering the needle to form an opening, especially in a high-speed loom, by repeating these movements at a very high speed continuously, This causes problems such as abrasion and breakage of the components of the needle and the needle holder, which is a cause of impairing the reliability of the opening forming device.

 The present invention aims to solve these problems.

(Means for Achieving the Object) Accordingly, the present invention provides a knife that reciprocates vertically.
In an opening forming apparatus for a loom, comprising a needle which moves up and down by engaging with the knife, and a needle holder which selectively holds the needle at a top dead center position, the needle holder is connected to a solenoid and a yoke side of the solenoid. A leaf spring having an upper end fixed to the yoke, a movable armature mounted on the lower end of the leaf spring, and having an upper end in contact with the yoke by the leaf spring, and a driven portion contacting the movable armature. A locking claw that is rotated by the driven portion by the driven portion to the protruding position, and a biasing portion that presses the driven portion against the force of the leaf spring when the solenoid is de-energized to urge the locking claw to the retracted position; A spring that provides a gap between the lower ends of the movable armatures, a vertically long locking hole that engages with the locking claw is provided at the upper end of the needle, and the needle is provided on the locking claw at the lower part of the needle holder. Towards It was placed a guide member for moving freely guide.

(Operation) When the solenoid is energized in the vicinity of the top dead center of the knife, the locking claw rotates to the projecting position via the movable armature and engages with the needle. Thereafter, even when the knife is lowered, the needle is held at the raised position.

When the solenoid is not energized, the locking claw is held in the retracted position by a spring, and in this case, the raised needle is lowered again together with the knife.

By controlling the energization of the solenoid, an opening (mouth) is formed according to the movement of the needle.

(Example) An example shown in Figs. 1 to 5 will be described.

The needle holder 20 selectively holds the needles 2, 2 at the top dead center position, and includes a solenoid 5 and a pair of locking claws 6, 6, and is attached to the substrate 10 via the case 4. .

A needle guide member 3 for guiding the needles 2, 2 which move up and down while being engaged with the knives 1, 1 is arranged below the needle holder 20.

The solenoid 5 of the needle holder 20 has a solenoid coil
The double-headed movable armature 5b that is attracted to the yoke (iron core) 5d by energizing the 5a is connected to the thin leaf springs 5c, 5c.
When the yoke 5d of the solenoid 5 is not attracted, a gap exists between the movable armature 5b and the yoke 5d. The gap is provided by a driven portion 6b which is always in contact with a movable armature 5b described below. The upper end of the movable armature 5b is in contact with the yoke 5d by a leaf spring, and the movable armature 5b can rotate around the contact point.
Thereby, a stable suction force can be obtained.

Corresponding to the armature 5b, locking pawls 6, 6 are provided which rotate around the support shaft 7, and the rotating tips of the locking pawls 6, 6 are used to hold the needles 2, 2 in a vertically long position. A claw portion 6a that engages with the hole 2a is formed, while a driven portion 6b that contacts the armature 5b is formed at the other end of the rotation. The locking claws 6, 6 are urged by the spring 8 against the force of the leaf spring 5c so that the claw portion 6a is retracted.

The case 4 containing these is detachably locked to a predetermined position of the substrate 10 via a U-shaped pin terminal 10a made of an elastic body protruding from the substrate 10.

A pair of guide grooves 3a are formed in the guide member 3 for guiding the needles 2, 2 to the pair of locking claws 6, 6, and the guide grooves 3a are continuous with the guide grooves 4a formed in the case 4. Thus, the needles 2, 2 are guided straight and vertically slidably without bending.

The guide member 3 is mounted and fixed to a guide mounting plate 11 below the substrate 10.

Below these, a pair of knives 1, 1 reciprocating vertically in synchronization with the rotation of the loom are arranged (however, this figure shows a part of the loom for convenience of explanation, The needle holder 20, the needles 2, 2, the knives 1, 1 and the like each have one set, and a large number of sets are arranged in parallel.)

The cord 9 is locked in the locking groove 2b at the lower end of each needle 2, 2.
It moves up and down together with 2 and 2, thereby forming an opening (hip).

The configuration is as described above, and the operation will be described next.

FIG. 3 shows a case where the needles 2, 2 are not engaged with the needle holder 20, in which the needles 2, 2 rise together with the knives 1, 1, and near the top dead center, the needles 2, 2 are vertically locked. The hole 2a reaches the position of the locking claws 6,6.
However, if the solenoid 5 is not energized, the locking claws 6, 6 are in a position retracted from the reciprocating path of the needles 2, 2 and do not engage with the needles 2, 2, in which case the knife 1, 1 is lowered. As a result, the hands 2 and 2 also move down.

On the other hand, when the solenoid 5 is energized at a predetermined timing when the needles 2, 2 reach the vicinity of the top dead center, the movable armature 5b is attracted to the yoke 5d, and the locking claws 6, 6 resist the spring 8 at this time. And rotate it. As a result, the claw portion 6a protrudes on the track of the needles 2, 2 around the support shaft 7, and protrudes into the locking hole 2a as shown in FIG. In addition, it is set in advance so that the locking claws 6, 6 are securely engaged with the needles 2, 2 when they enter, and at the time of retreat, a predetermined interval that does not interfere with the needles 2, 2 is maintained.

Next, when the knives 1,1 descend from the top dead center position,
Since the needles 2, 2 are engaged with the locking claws 6, 6, they remain at that position, and only the knives 1, 1 are lowered. Thus, the needle 2,2
After the is engaged with the locking claws 6, 6, the power supply to the solenoid 5 is stopped.

In this case, since the hooks 6, 6 are under tension of the needles 2, 2 and the cords 9, the engaged state is maintained as shown.

The engagement between the needles 2, 2 and the locking claws 6, 6 is released by stopping the energization of the solenoid 5 when the knife 1, 1 rises to near the top dead center.

When the needles 2, 2 are slightly lifted near the top dead center due to the rise of the knives 1, 1, the pulling force applied to the locking claws 6, 6 is released, so that the locking claws 6, 6 are 3 retreats from the locking hole 2a due to the repulsion force, and the state shown in FIG. 3 is obtained.

Thus, the released needles 2,2 descend together with the knives 1,1.

On the other hand, to continue the engagement between the needles 2, 2 and the locking claws 6, 6, when the knife 1, 1 rises to near the top dead center, the solenoid 5 is energized, and the movable armature 5b is moved to the yoke 5d. Adsorb to. In this case, even if the load on the needles 2 and 2 is released, the locking claws 6 and 6
Is still in engagement with the needles 2, 2 since it is in the extended position. Therefore, even if the knives 1 and 1 are lowered, the hands 2 and 2 remain, and even if the power supply to the solenoid 5 is stopped thereafter, the hands 2 and 2 are held at the raised position in the same manner as described above.

If the operation of the solenoid 5 is controlled by a computer or the like according to a preset program for these operations, an opening (mouth) is formed based on the movement of the cord 9 connected to the needles 2, 2.

By the way, during these series of movements, the needles 2
It only repeats up and down movement along the guide grooves 3a, 4a, but does not bend or rub in the direction of the electromagnet as in the past, so that the needles 2, 2 may wear out even at high speed operation. Can be protected from damage.

Further, according to this embodiment, the two locking claws 6, 6 can be simultaneously operated by one armature 5b. Also, printed wiring is provided on the substrate 10, and the pin terminals 10a are crimped thereon and the needle holder 20 is attached, so that attachment and detachment to the substrate 10 can be easily performed,
Further, at the time of component replacement, the needle holder 20 can be removed and replaced together with the substrate 10.

When the solenoid 5 is attracted, the armature 5b and the yoke 5
By providing an appropriate gap in the music with 5d, the residual magnetism can be reduced and the operation stability can be improved.

(Effects of the Invention) As described above, according to the present invention, since no bending or rubbing force acts on the needle during its reciprocating motion, wear and breakage are small, and durability and reliability are significantly improved. can do.

[Brief description of the drawings]

FIG. 1 is a front view of an essential part of an embodiment of the present invention, and FIG.
FIG. 3 is a cross-sectional view taken along the line AA for explaining the operation state, and FIG. 5 is a cross-sectional view taken along the line BB of FIG. 1 ... knife, 2 ... needle, 3 ... guide member, 3a ... guide groove, 5 ... solenoid, 5b ... armature, 5d ... yoke, 6 ... locking claw, 8 ... spring, 10 ...... board, 20
... Needle holder.

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D03C 3/20

Claims (1)

(57) [Claims] 1. An opening forming apparatus for a loom comprising a knife reciprocating in a vertical direction, a needle engaged with the knife to move up and down, and a needle holder for selectively holding the needle at a top dead center position. , The needle holder and the solenoid, a leaf spring disposed on the yoke side of the solenoid, the upper end is fixed to the yoke,
A movable armature is provided at the lower end of the leaf spring, the upper end of which is in contact with the yoke by the leaf spring, and a driven portion which is in contact with the movable armature. When the solenoid is energized, the driven portion is moved by the movable armature and turned to the projecting position. A locking claw, and a spring that presses the driven portion against the force of the leaf spring when the solenoid is not energized to urge the locking claw to the retracted position and provides a gap between the yoke and the lower end of the movable armature. That a vertically long locking hole for engaging with the locking claw is provided at the upper end of the needle, and a guide member that guides the needle slidably toward the locking claw is provided at a lower portion of the needle holder. An opening forming device for a loom.