JPH108343A - Apparatus for carrying out programming of rotary dobby for weaving machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for carrying out the programming of a rotary dobby, capable of guaranteeing the selection of position excellent in precision and reliability of a heald frame of a weaving machine by a method simpler than a conventional one. SOLUTION: This apparatus is a type in which a heald frame operating rod 3 is energized by a few connecting rods 2 each fixed to an eccentric ring 5 revolving relatively against a main shaft 1 of a dobby and comprises a disc 13 to be revolved by the main shaft, a selective ring 7 which is pivotally hinged on the eccentric ring and is engaged through one tooth 11 of the end part with the disc by the action of a spring 12 and an operating means which is installed along the orbit of an end part 8 opposing to the end part of with the tooth of a selecting lever or alternately to the outside of the orbit so as to cause or avoid the engagement of the revolving disc with the selecting lever. The action of the operating means is linked to the revolution of the main shaft and the operating means comprises at least one electric linear stepping motor 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved device for performing the programming of a rotating dobby for operating a heald frame on a loom.

[0002]

As is well known, the positioning of the heald frame of a weaving machine or loom, from which the configuration of the weft yarns of the finished fabric must be obtained, must be programmed in a predetermined sequence, whereby each sequence A pendulum device that defines the position that the frame should assume for each revolution of the spindle, thereby manipulating the frame itself to obtain one of the two positions it needs, namely high or low. Is provided.

[0003] Since the main axis of the dobby is operated according to an intermittent cycle with a dead center every 180 degrees from half a revolution, the operating and control device is integrated with the rotary shaft for each stop of the main axis, or else with the rotary shaft. Need to be able to be integrated with an eccentric cam or similar device that biases the frame moving lever, resulting in a change in its position in some cases and in its previous position in other cases. Will be maintained. Therefore, the dobby that operates the heald frame on the loom, by means of a special actuator,
It must be controlled by means of a special device for performing programming, which is designed to generate a change in the relative position of the actuation means and then change the position of the frame.

However, Dobby has a number of disadvantages, such as having the time required to clear a previous programming operation and enter a new programming operation for the next half turn. It is already well known in the art of devices for performing dobby programming that the need to stop the axis every half turn is included. It is clear how this type of programming device increases the idle time of the loom before compromising the useful operating time.

Another type of device that may be encountered with known types of devices, with a single control each time the operating lever is pressed in synchronization with the middle of the movement diagram, for both forward and reverse movement. A disadvantage of this type is that the choice of clockwise or counterclockwise movement increases the likelihood of error, and furthermore, such devices position the weft yarn,
If it is necessary to reestablish the mouth for recording purposes, it is essential to perform several half-turns with no load.

An apparatus for performing programming of a dobby, in particular a rotating dobby for controlling a loom, comprising:
Without stopping the rotation of the main shaft every half rotation, it is possible to select the position of the heald frame to be executed, and to enable independent frame selection for clockwise rotation and counterclockwise rotation. To reduce the stresses of the dobby components and ensure reduced stresses and forces,
As a result, the technical problem of providing a device which enables very high processing speeds and low power consumption has been solved by a device forming the subject of Italian patent application No. MI95A 002037 by the applicant. This device is intended for a rotating dobby of the type in which the heald frame operating rods are biased by several connecting rods, each mounted on an eccentric ring rotating relative to the main axis of the dobby,
Furthermore, the device comprises a disc rotated by the main shaft and a selector lever pivotally hinged on an eccentric ring, the spring being engaged with the disc via one of its end teeth. And a selection lever designed to fit the
It also has an operating lever that rotates around a fixed fulcrum, opposite the spring-type return means, so that the protruding end profile of the operating lever provides engagement of the rotating disc with the selection lever, or To avoid that engagement, they are arranged along a track at the end opposite the toothed end of the selection lever or alternately outside the track. The rotation of the operation lever is performed when the main shaft rotates.

[0007]

In the case of the embodiment according to the above-mentioned patent, a mechanical solution is employed, in which one of the projecting end profiles of the operating lever is adapted to the operating lever. Formed inside a recess having two flared abutment walls as teeth pivotally hinged to corresponding ends of the spring, and being held in contact with one of the abutment walls by a spring, In a situation where the dobby is moved in the reverse direction, the active engagement with the selection lever can be swung until it comes into contact with the other so that the active engagement with the selection lever is displaced, and accordingly, the spring action on the selection lever and the operation lever The spring action on the toothed profile is sized such that the latter cannot exceed the former.

What has now been found is that the problem of performing the programming of a rotary dobby of the type specified immediately above in a somewhat simpler manner than before has been addressed in an electrically controlled manner to move the operating lever. Can be dealt with and solved through the use of electrical operating means that can generate or replace it during its control operation.

[0009]

SUMMARY OF THE INVENTION Accordingly, the present invention more particularly relates to an apparatus for performing the programming of a rotating dobby for operating a heald frame of a loom, the apparatus comprising a heald frame operating rod, Of the type driven by several connecting rods each mounted on an eccentric ring rotating relative to the main axis of the dobby, furthermore a disk rotated by the main axis and pivotable on the eccentric ring A selection ring, hinged to one of said end rings, the selection ring being designed to engage said disc by spring action via one of its end teeth, said device comprising operating means. However, the operating means may be provided along a trajectory at the end opposite to the toothed end of the selection lever to provide or avoid engagement of the selection lever with the rotating disc, and Are arranged alternately with the outside of its orbit, the operation of the operating means in conjunction with rotation of the main shaft, said operating means, characterized in that it consists of at least one electric linear stepper motor.

In a first embodiment of the invention, the operating means is a toggle lever, the profile of the protruding end of the lever providing or avoiding engagement with a rotating disc. A toggle lever that rotates about a fixed fulcrum at an intermediate point so as to be alternately arranged along a track at the end opposite the toothed end of the selection lever or outside the track. And an electric linear stepping motor for controlling the rotation of the lever in both directions.

In a second embodiment of the invention, the operating means are designed to engage with the end of the selection lever opposite the toothed end and are arranged at an angle and spaced apart. To provide or avoid engagement of the two protrusions with the rotating disc and the toothed end of the selection lever.
It consists of two electric stepping motors that control the engagement between the selection lever and the protrusion.

The present invention will now be described in more detail with reference to two presently preferred embodiments, given by way of example only with reference to the drawings, in which:

[0013]

DETAILED DESCRIPTION As shown in the drawings, the device according to the invention forms a part of a dobby, which comprises a rotating main shaft 1 which is wedged on a connecting rod element 2. The connecting rod 2 has, at 3A, a projection 2A pivotally hinged to an operating rod 3 of a heald frame (not shown), and a substantially circular ring 2B with two rollers 2C at opposing positions. It is molded as follows.

The center of the connecting rod 2 is inserted inside a bearing 4, the inner ring of which is mounted on an eccentric cam 5 which can rotate relative to the shaft 1, as seen further below. .

The eccentric cam 5 is provided by means of rivets 6 and other means and by means of rocker levers 7 having shaping ends 8 and 9 and a toothed end 11 facing the end 9 inside, ie a selection lever. It is mounted to swing.

A spring 12 arranged between the eccentric cam 5 and the end 9 of the selector lever 7 exerts a return action on the lever 7 itself, so that the toothed end 11 moves towards the axis of rotation of the main shaft 1. Try to rotate the lever as you do.

Finally, the spindle 1 is wedged on the disk 13 and has two grooves 13A and 13B around its periphery.
Which are arranged diametrically opposite to the center of rotation of the disk 13 itself, and
Are positioned on the axis of the spindle 1.

The disc 13 is wedged on the inner ring of the bearing 4, and the outer ring of the bearing 4 is wedged on the eccentric cam 5 for rotation about the main shaft 1.

Since the disc 13 is in the same position as the selection lever 7, the toothed end 11 of the selection lever 7 can engage or disengage from one of the two grooves 13A, 13B.

In the case of the embodiment shown in FIG. 1, the dobby is completed by an elbow-shaped operating lever 14, the ends of which are formed as one-piece, molded, projecting profiles 14A and 1A.
4B. The operating lever 14 is mounted at its midpoint and is pivotable about a fulcrum 14C so that its shaped end profiles 14A and 14B have a toothed end (1
Assume a different position, opposite to 1), which can be engaged or disengaged with the end (8) of the selection lever (7).

In accordance with the present invention, the position of the operating lever 14 is controlled by an electric stepping motor 15 as shown, acting within its appropriate seat 14D and in proximity to the end 14A of the operating lever 14. Therefore, swinging of the operation lever 14 which is actively controlled in both directions of rotation occurs.

In the embodiment shown in FIG. 2, the dobby is no longer provided with a control lever 14 and a pair of projections 16 and 17
Which are arranged at a considerable angular distance from each other so as to oppose the toothed end 11 under the control of two electric linear stepping motors 18 and 19, respectively. It can engage directly with the end 8 of the selection lever 7.

Next, the operation of the dobby will be described with reference to the embodiment shown in FIG. 1. At the start of the half rotation of the main shaft 1, a forward movement is assumed, and the programming is performed by changing the position of the frame. Assuming that the change has been performed, the motor 15 holds the end 14A of the operating lever 14 outside the trajectory of the end 8 of the selection lever 7, so that the selection lever 7 The end 11 is engaged in the groove 13 </ b> A, and is in a state of receiving the return action of the spring 12.

In this situation, the eccentric cam 5 is integral with the rotary disk 13, which causes the eccentric cam 5 itself to rotate when the main shaft 1 rotates during the next half rotation, and thus the connecting rod 2 Producing rotation, when rotated, drives the frame operating rod 3, which causes the position of the frame to change.

Before the half rotation is completed, the motor 15 controls the next half rotation. This is the case for the case where the problem is to keep the frame in the previous position. Accordingly, the motor 15 exerts a pressure on the end contour 14A of the operating lever 14, thereby causing a counterclockwise rotation of the operating lever 14, whereby the end contour 14B becomes the end of the selection lever 7. 8, the selection lever 7 is moved to a position facing the end 14 </ b> B of the operation lever 14 for a while. Thus, the selection lever 7 is forced to rotate around its own rivet (pin) 6 as the disc 13 continues to rotate, whereby the teeth provided at the end of the disc 13 facing the groove 13A 11 will gradually leave.

When the half-turn dead center is reached, the selection lever 7
Is rotated outward and engaged with the roller 2C, and at the same time, is entirely separated from the groove 13A.

Therefore, the eccentric cam 5 remains idle with respect to the disk 13, and thereby the operating rod 3
Will be maintained as desired during the next half-turn.

The operation of the dobby in the embodiment according to FIG. 2 is similar, and in a simpler manner than in the previous case, the engagement of the end 8 of the selection lever 7 with the projections 16 and 17 Occurs in a timely manner by direct control of the motors 18 and 19.

It is not particularly necessary for a person skilled in the art to illustrate the corresponding stages of operation of the device according to the invention in the case of backward movement, that is, according to the description assuming forward movement.

Using the described and illustrated arrangement, the invention guarantees in a very advantageous way a precise and reliable position selection of the heald frame, which stops the rotation of the shaft every half a revolution. Need not be done, thus avoiding any obstructions during this phase and allowing independent selection of frames both at forward and reverse movements, even at very high dobby speeds. The invention has important advantages in terms of the productivity of the associated loom.

It is to be understood that other practical embodiments of the invention are possible which are different from those described and will be apparent to those skilled in the art. That it is legally within.

[0032]

Since the invention is constructed as described above, a precise and reliable positioning of the heald frame is ensured in a much simpler and more convenient manner than before, including There is no need to stop the rotation of the shaft at all, thus avoiding any obstructions during this phase, and independent selection of the frame ensures that the dobby speed is very high both in forward and reverse movement. It is possible.

The apparatus of the present invention also has important advantages in terms of the productivity of the associated loom.

[Brief description of the drawings]

FIG. 1 shows a partial schematic cross section of a rotating dobby to which an apparatus according to a first embodiment of the invention is applied, in an initial position of a half turn.

FIG. 2 is a schematic diagram of a second embodiment of the present invention, similar to the schematic diagram of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main shaft 2 Connecting rod 3 Heald frame operation rod 5 Eccentric cam 7 Selection lever 8 End of selection lever 11 Toothed end (teeth) of selection lever 12 Spring 13 Disc 14 Operation lever 14A, 14B Protruding end contour 14C Fixed Support points 15, 18, 19 Electrical linear stepping motor 16, 17 Projection

Claims (3)

[Claims] An apparatus for performing programming of a rotating dobby for operation of a heald frame of a loom, comprising:
The device is of the type in which a heald frame operating rod (3) is biased by a number of connecting rods (2) each mounted on an eccentric ring (5) which rotates relative to the main axis (1) of the dobby. And a selection ring (7) pivotally hinged on said eccentric ring (5), said disc (13) being rotated by said main shaft (1), the end teeth ( 11) through one of them a selection ring (7) designed to engage said disc (13) by the action of a spring (12), said device comprising operating means; The means comprises an end (11) opposite the toothed end (11) of the selection lever (7) for effecting or avoiding engagement of the selection lever (7) with the rotating disc (13). 8) along the track or alternately outside the track Are, apparatus operation of the operating means in conjunction with rotation of the main shaft, said operating means, characterized by comprising at least one electric linear stepper motor (15, 18, 19). 2. The operating means is a toggle lever (14).
The projecting end profiles (14A, 14B) of 4) provide a toothed end of the selector lever (7) for providing or avoiding engagement with the rotating disc (13). A toggle lever (14) that rotates about a fixed fulcrum (14C) at an intermediate point so as to be alternately arranged along the track at the end (8) facing (11) or outside the track. The device according to claim 1, characterized in that it comprises an electric linear stepping motor (15) for controlling the rotation of the toggle lever (14) in both directions. 3. The operating means is designed to engage an end (8) of the selector lever (7) opposite the toothed end (11) and is angled and spaced. Two protruding portions (16, 17), the rotating disc (13) and the selection lever (7).
To control the engagement between said selector lever (7) and said projections (16, 17) to provide or avoid engagement with the toothed end (11) of the two The device according to claim 1, characterized in that it comprises an electric stepping motor (18, 19).