JPH0219534A - Selecting and holding apparatus for lifting member - Google Patents

Abstract

PURPOSE:To provide the subject apparatus for the yarn selection, etc., of a loom, free from heat-generation, enabling accurate holding and control, composed of a lifting member, a lifting means for the member and a selective holding means for lifted member and restricting the lowering of the lifting member with a holding tool displaced by a piezoelectric element of the holding means. CONSTITUTION:A heddle 11 is supported by a pulley 13 via a link rod 12. The pulley 13 is suspended with a wire 14 and both ends of the wire 14 are connected to two rods 1, 2 constituting a lifting member. The lifting member is lifted with a lifting means which alternately lifts and lowers the rods 1, 2 of the lifting member by interlocking protrusions 17, 18 of the rod with naises 15, 16 vertically reciprocating alternately along the right and left rods 1, 2. The lifted member is held with a holding means 30 disposed above the rods 1, 2 of the lifting member and composed of a piezoelectric element 23 and holding tools, 25, 26. The holding tools 25, 26 are displaced with the piezoelectric element 23 to check the lowering motion of the member. The yarn selection, etc., of an Axminster loom is carried out by using the selective holding apparatus 30 having the above structure.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a method for selectively holding an elevating member that selectively restricts the descending of the elevating member after it has been raised so that the height of the elevating member can be selected from two positions. Regarding equipment, when controlling the healds of a loom by attaching healds to the lower part of the lifting member, the lifting member (yarn carrier) is configured by arranging multiple holding parts in multiple stages and providing multiple thread end holding parts. It is used when selecting threads for Axminster carpet looms.

(Prior art and its problems) As this type of elevation control device, for example, Japanese Patent Laid-Open No. 59-1
A heald control device from No. 99833 is known.

As shown in Fig. 5, this control device is arranged so that a rondo (1) with healds (not shown) attached to its lower end can be moved up and down along projections (5) provided on both sides of a holding body (4). (only one rod is shown in the drawing), a knife (not shown) is raised, and the knife is engaged with a protruding piece A3 protruding from the rod (1), thereby raising the rod (1).

When the rod (1) is raised, the electromagnet (
6) and an electromagnet (7) having an S pole are selectively excited, a desired rod (1) is forcibly bent toward the main body (4), and a hole ( 9) The main body (
The rod (1) is held facing the locking part (8) protruding from the blade (4), and is configured so that the rod (1) does not fall even when the knife descends, and when the knife reaches the bottom dead center, it is held at a high position. This results in some rods being at a lower position and others at a lower position.

However, this control device uses electromagnets to forcibly bend the members when holding the raised members, so the electromagnets are large and many electromagnets are used in looms. As a result, the electromagnet generates heat during weaving due to repeated energization, which is disadvantageous in that accurate operation of the electromagnet cannot be expected.

(Technical Problem) An object of the present invention is to prevent the holding device from generating heat in a selective holding device for a lifting member.

(Technical means) The technical means for solving this technical problem are (a) consisting of an elevating member, a moving means for elevating it, and a holding means for selectively holding the elevated member; (b) The holding means is composed of a piezoelectric element and a holding tool, (c)
The pushing member displaces the holder and holds the elevating member.

When applying this technical measure to a loom, the healds can be attached directly to the lifting member.

In addition, the heald is connected to a pulley that is pivoted so that it can move in the vertical direction, and the middle part of the elevating members arranged on the left and right is made of a flexible member to suspend the pulley, and the elevating member is moved by the moving means. It can be constructed so that the elevating members/materials are raised alternately and held by the holding means of the above-mentioned technical means.

Further, in accordance with the above-mentioned technical means, the elevating member can be configured with a thread carrier having a plurality of retaining parts in multiple stages and a plurality of thread end holding parts, thereby providing a thread selection device for an Axminster loom.

(Effect of technical means) The entire lifting member is once raised by the moving means.

By applying different voltages to the piezoelectric element, the element is strained and bent. Therefore, when a voltage is selected and applied, the element is instantly bent in a predetermined direction and functions as an actuator.

When voltage application is selected in response to the rising member, a holder that is pushed by the piezoelectric element and moves toward the path of the member and a holder that does not move are selected, and the former holder moves downward due to its own weight. The member which is about to descend is held by the urging force of the member and its descent is restricted.

Therefore, when the other members are lowered, the member at the upper position and the member at the lower position are selected.

The operation of this piezoelectric element allows a large amount of displacement to be obtained with a small stress, and its power consumption is extremely low, so even if the piezoelectric element is operated repeatedly each time the member is raised, the element itself does not generate heat.

When the healds are attached directly to the elevating member, the shedding movement of the warp threads can be performed directly.

In addition, when heald control is performed using a pair of left and right lifting members and pulleys (in the case of the third claim), one lifting member is held and only when the other lifting member is raised in the next process is the heald controlled. The pulley will be raised and an opening movement will be performed.

Furthermore, when used as a thread selection device for an Axminster loom (fourth claim), the thread carrier is raised once, and when it is lowered, the engagement portion of the carrier is selected and the piezoelectric element is operated to displace the holder. By doing so, the desired thread can be stopped at a predetermined height.

(Effects of the Invention) As a result of suppressing the heat generation of the holding device, there is an advantage that the holding of the member is not affected by heat and accurate holding control can be performed.

Piezoelectric elements can be constructed with extremely thin walls, so unlike conventional electromagnets, there is no need to prepare a large space for holding means. There's no need to make it a thing.

Further, in the control device according to the present invention, since the tip of the elevating member is not forcibly bent, there is an advantage that the elevating member can be made durable.

Therefore, when the device of the present invention is used to control warp shedding in various looms, accurate shedding prevents pattern distortion and increases weaving speed.

(Example) Next, a specific example of the above technical means will be explained with reference to the drawings.

FIG. 1 is a front view of essential parts of a heald control device (1o) according to the present invention.

A pulley (13) with a heald (11) supported via a link rod (12) is suspended by a wire (14) connected to lifting rods (1) and (2) at both ends, and the left and right rods (
1) Knife (15) that goes up and down alternately along (2)
(16) protrudes from the rod (17) (1B
) and raise and lower the rods (1) and (2) alternately.

The holding device (3o) placed above the rods (1) and (2) as the left and right lifting members is a piezoelectric member (
21) and hooks (25) and (26) as locking devices.

The piezoelectric member (21) is connected to an electrical signal output device (not shown), and this output device causes the thin metal plate (22) to
When a voltage is selectively applied to the piezoelectric ceramic (23) and the piezoelectric ceramic (23), the piezoelectric member (21) bends to the right or left in response to the voltage.

The hooks (25) and (26) are arranged along the left and right sides of the tip of the piezoelectric member (21) with their upper portions pinned to the holding device main body (30).

Therefore, in synchronization with the rise of the rod (2), the member (21)
When bent to the right, the hook (25) is pushed and displaced toward the rod (2) and enters the hole (19) formed in its upper part.

The rod (2) whose hook (26) has entered the hole (19) will remain in that position even if the knife (16) is lowered.

At this time, the rod only moves relatively, and the pulley (
13) never moves.

Next, when the neighboring knife (15) rises, the rod (1)
is raised. At this time, since the rod (2) is stationary in the raised position, the pulley (13) rises,
The heald (11) connected to this will also be pulled up. At this stage, the heald (
1) Insert the hook (25) into the hole (20) of the rod (1) corresponding to
), and the warp threads are sequentially opened.

FIG. 4 shows a control device for a yarn carrier (41) in an Axminster carpet loom.

A large number of plate-shaped thread carriers (41) each having a lower end supporting a large number of colored threads (42) in multiple stages are arranged in parallel so that they can be raised and lowered, and engagement recesses (43) are formed in multiple stages on the upper part of each carrier (41). A holding device (3o) is arranged to face this.

In the above embodiment, the two hooks (25) and (26) are alternately displaced by one piezoelectric member (21), but as shown in FIG. corresponding to members (31) (32) and hooks (35), respectively.
) (36).

In FIGS. 1 and 2, the piezoelectric member is displaced along the hook, but as shown in FIG. 3, the hook (37) pivots the tip of the piezoelectric member (33). It can also be displaced by engaging the rear end of the.

In addition to being pinned to the main body (3o), the hook serving as the holder may be configured with a spring body so that it can return naturally when the piezoelectric member does not operate.

In any of the above cases, a hook is shown as an example of a holder for holding the member, but the inwardly biased protrusion is arranged perpendicularly to the rod, and the bent piezoelectric member is used as a hook. It is also possible to push the button.

In the drawings, the structure of the piezoelectric element is explained using a thin metal plate with piezoelectric ceramics bonded on both sides, but in addition to the above, two pieces of piezoelectric ceramic are used as the members for pushing the holder. It may be one in which thin plate-shaped piezoelectric ceramics are directly bonded together, or one in which thin plate-shaped piezoelectric ceramics are bonded to a flexible metal plate.

[Brief explanation of drawings]

The drawings are for explaining specific examples of the above-mentioned technical means, and FIG. 1 is a front view of main parts of the heald control device, FIG.
The figures are a schematic front view of a holding device in another embodiment, FIG. 4 is a schematic view of a yarn carrier in an Axminster loom, and FIG. 5 is a schematic front view of a conventional heald control device. (1) (2) Rod, (17) (18) Rod protrusion, (15) (16) Knife, (14) Wire, (30
) holding device, (22) thin metal plate, (23) piezoelectric element, (
21) (31) (32) (33) Piezoelectric member, (2
5) (26) (36) (37) Hook, (4■)
Thread carrier figure 5

Claims (4)

[Claims] (1) It consists of an elevating member, a moving means for raising it, and a holding means for selectively holding the elevated member, and the holding means is composed of a piezoelectric element and a holder, and the piezoelectric element displaces the holder. A selective holding device for a lifting member that restricts the lowering of the member. (2) A heald control device for a loom, in which a heald is attached to the lower end of the elevating member according to claim 1. (3) A pulley that connects healds and is pivoted to enable movement in the vertical direction, a member that has at least the middle part made of a flexible member to receive the pulley, and that both ends are arranged upward, and the members are raised alternately. A heald control comprising a moving means for moving the raised member, and a holding means for selectively holding the raised member, the holding means comprising a piezoelectric element and a holder, and the piezoelectric element displaces the holder to hold the member. Device. (4) A yarn selection device for an Axminster loom, wherein the elevating member according to claim 1 is a yarn carrier having a plurality of engaging portions arranged in multiple stages and a plurality of yarn end holding portions.