JPS6215356A - Control mechanism for shuttleless loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (a) Industrial Application Field: This invention relates to a shuttle powerless loom in which the weft is placed in the correct position by a flexible belt equipped with a gripper and driven by alternating reciprocating motion. .

(b) Background technology: Shuttleless looms are well known, in which the weft threads are inserted by two rigid or flexible so-called transverse needles or lances, and these transverse needles or lances are equipped with grippers at their ends. It is driven by alternately reciprocating track motion in the following manner.

That is, when the weft needles are moving toward each other towards each other, the weft thread pulling the weft thread in its gripper will cause the weft thread to move toward the center of the shed where the weft thread is transferred to the gripper of the other weft thread. carry.

During the alternating backward movement of the two weft needles, the weft needle that has just received the weft completes its positioning.

There are also shuttleless looms which operate essentially on the same principle as described above, but in which the grippers for pulling the weft threads are carried at the ends of two flexible open belts.

Each belt passes over a toothed drive wheel that serves to drive it. The toothed drive wheels are such that they are driven to rotate in alternating directions in such a manner that the drive wheels transmit longitudinal motion to the straight sections of the belt with the grippers at the ends.

Synchronized with the operation of the entire power loom, the toothed drive wheels must be driven in such a way that they rotate in alternating directions to the extent corresponding to the required path of the flexible belt. This is generally achieved by a control mechanism capable of converting continuous rotation of the power loom shaft into alternating rotation of a toothed drive wheel that drives the belt.

For such purposes, existing control mechanisms generally use cams, coupling members, and gears, which in combination form mechanical transmissions of greater or lesser complexity. Since the axis of the power loom, which forms the source of the motion, is usually perpendicular to the axis of the toothed drive wheel on which the belt runs, this mechanical transmission is very often
These include conical gears or other bevel gears, which are expensive to manufacture, create play within the mechanism, and create undesirable axial stresses.

Mechanisms produced in this way are known, for example, in Swiss patent no. 606,551 and in French patent no. 2.438°6.
It is described in No. 97.

SUMMARY OF THE INVENTION: This invention overcomes the above-mentioned disadvantages by providing a system that is inexpensive, uses spur gears, is particularly simple, is perfectly balanced, and allows easy adjustment of the path of the flexible belt. By providing a control mechanism, it is planned to remove (2).

In order to achieve such an object, the control mechanism for a shuttleless loom equipped with flexible belts of the present invention includes the following for each belt. (a) at least one cam disposed on a power loom shaft driven by continuous rotation about an axis parallel to the linear motion of the belt; (b) oscillating about an axis parallel to the axis of said shaft; (c) a toothed drive connected to the swingable arm of the lever by a first joint and driving the belt by a second joint; A sector gear (toothed 5ect) mounted so that it can swing around an axis parallel to the rotating axis of the ring.
a connecting member connected to or), and a spur pinion (sour p
inion).

The mechanism which is the subject of the invention is specially equipped with a connecting member which transmits the oscillating movement of the lever to this sector in a plane perpendicular to the plane of the sector gear.

In this way, bevel gears can be omitted and the number of spur gears required can be reduced to a minimum since the mechanism only requires a sector gear and a single pinion. can.

Since the connecting member connects two members that swing in orthogonal planes, it is preferable that the connecting member is connected to the arm of the lever that can swing by a first joint of the spherical bearing type. , it is also preferable to connect it to the sector gear by means of a second joint, also of the spherical bearing type.

In a particular embodiment of the invention, the swingable lever, in addition to the arm connected to the connecting member, each cooperates with two connected cams arranged on a shaft driven in continuous rotation. It has two branch parts with rollers.

A further feature is that the sector gear extends beyond its pivot axis in the vicinity of the arm on which the second joint of the coupling member is mounted. Such an arrangement is particularly balanced, in that the sector gear itself on the one hand, and the overhanging arm connecting the coupling member on the other hand, are diametrically aligned relative to the oscillating axis of the sector gear. overhangs the opposite area in the direction of .

The position of the second joint of the coupling member is advantageously adjustable along the arm from which the sector gear extends. This makes it possible to change the oscillation angle of the sector gear and thus to adjust the path of the belt. The second joint of the spherical bearing type of the connecting member is
For example, a sector gear can be held by a slidable support member over an overhanging arm and locked to the arm in a desired position by at least one screw.

The arm from which the sector gear extends is of a rectangular shape, with its recess pointing towards the first joint of the connecting member, so that the arm from which the sector gear extends can be moved from the first
Adjustment can be made by pivoting a connecting member around the joint.

B) Example 2 The present invention will be described in detail below with reference to the accompanying drawings.

The mechanism shown is designed for the control of a flexible belt (1), which is equipped at one end with a gripper (2) suitable for holding the weft thread. The belt (1) has a hole (3) and is wound around a toothed drive wheel (4), and this drive wheel is attached so that it can rotate around an axis (5), and the drive wheel Make sure that the teeth of the ring engage the holes (3). This mechanism, which is the subject of the invention, drives a toothed drive wheel (4), with the straight section of the belt (1) having a gripper (2) at one end indicated by the arrow (7).
The toothed drive wheels (4) are made to rotate in alternating directions shown by arrows (6) so as to be driven by alternating translational movements shown by.

The part of the belt (1) on this side of the toothed drive wheel (4), which is not shown, may be guided and stored in the casing.

In FIG. 1, the toothed drive wheel (4) is shown at a distance from the control mechanism for clarity.

This control mechanism comprises two connected cams (8, 9) mounted on the shaft (io) of the power loom, which in operation is parallel to the linear movement of the belt [1]. around an axis (12), i.e. perpendicular to the axis of rotation (5) of the toothed drive wheel (4), in continuous rotation as indicated by the arrow (1)).

The two connected cams (8, 9) are connected to the axis (10) of the shaft (10).
It cooperates with a lever (13) which is mounted so as to be able to swing around an axis (14) parallel to (12). Lever (13)
has a first branch (15) which has at its free end a roller (16) rotating about an axis (F) and displacing on a first cam (8). This lever (13) also has a second branch (18) at its free end which rotates about an axis (20) and rolls on a second cam (9). Another roller (
19). This pivotable lever (13) also has an arm (21).

The toothed drive wheel (4) is a spur pinion (spur pi
(23) is mounted on a mounted shaft (22), which shaft (22) is mounted so as to be rotatable about the axis (5). The spur pinion (23) is a toothed gear that is integrated with the boss (25).
(24), this boss (25) engages with the axis (
A sector gear (24) is mounted so as to be able to swing around an axis (26) parallel to 5). Boss of sector gear (24) (
25), as shown in detail in FIG.
Shed arm) (27).

Both the sector gear (24) on the one hand and the arm (27) on the other hand have bosses (25) in diametrically opposed areas relative to the boss (25).
It's sticking out from.

The arm (21) of the swingable lever (13) is connected to a connecting member (28) to an arm (27) that is integrated with a sector gear (24).
connected by. One end of the connecting member (28) is connected to the free end of the arm (21) by a first spherical bearing (29). The other end of the connecting member (28) is connected to a location on the countersunk arm (27) by a spherical bearing (30).

FIG. 2 shows details of the two spherical bearings (29, 30).

The free end of the arm (21) of the swingable lever (13) has a spherical receiving surface (31), around which is attached an annular element (32) with a spherical inner surface, which is connected to the connecting member (
28) is held enclosed within a cylindrical recess (33) formed at one end.

Additionally, a cylindrical recess (34) is provided at the other end of the connecting member (28).
The annular element (35) having a spherical inner surface surrounding the spherical receiving surface (36) is surrounded and held therein. This spherical bearing surface (36) is held by a support member (37) passing straight through it, and this support member (37) supports the second spherical bearing (30) between two of the countersunk arms (27). It is fixed to the two branches of the countersunk arm (27) in such a way that it is located between the branches of the arm (27).

The support (37) is secured to each branch of the countersunk arm (27) with a locking screw (38), which threads through the corresponding branch into the thread of the support member (37). It will be stopped. The head of each screw (38) is placed on the upper surface of the corresponding branch part using a collar (39), and the support member (37) is arranged so that the head of each screw (38) is placed on the upper surface of the corresponding branch part, and the support member (37) Apply by tightening (38).

The above-mentioned fastening means allow adjustment of the position of the second joint (30) of the connecting member (28) in the ratchet arm (27) integral with the sector gear (24);
The support member (37) can be moved on the arm (27) by loosening the screw (38).

The control mechanism described above may be entirely contained within a casing (40), a portion of which is shown in FIG.

When the power loom is in operation, the continuous rotation of the shaft (10) in the direction of the arrow (1)) is caused by the oscillation of the lever (13) about the axis (14) by the connected cam (8°9). With one complete revolution of the axis (1o), the axis (12
) one oscillating movement of the lever (13) in a plane perpendicular to ) takes place.

The oscillating movement of the lever (13) is transmitted by the coupling member (28) to the sector gear (24), which oscillates in a plane perpendicular to the axes (5, 26) and the oscillating plane of the lever (13). The alternating rotation of the sector gear (24) is transmitted to the pinion (23) and thus also to the toothed drive wheel (4), which allows it to move the straight section of the belt (1) with the gripper (2) at one end in the desired direction. Move it back and forth.

The range of this forward and backward movement is determined by the radius of the toothed drive wheel (4), and is also determined by the radius of the toothed drive wheel (4) and the pinion (23) and sector gear (24).
) is determined by the ratio of each radius. The radius of the pinion (23) is selected to be smaller than the radius of the sector gear (24), so that one oscillating movement of the sector gear (24) over a limited angle results in one alternating rotation of the pinion (23). However, the range of the pinion is limited to the belt (1
) can be several revolutions so that it moves over a fairly large path.

Adjustment of the position of the coupling member (28) on the arm (27) of the joint (30) changes the swinging angle of the sector gear (24), and thus changes the pinion (23) and toothed drive wheel (4). It makes it possible to change the range of alternating rotations and therefore the path of the belt (1).

A control mechanism similar to and synchronously operating with the mechanism described above can be provided on the second flexible belt of the power loom.

Although the present invention has been described above in detail with reference to the embodiments, it goes without saying that the embodiments can be modified in various ways without departing from the spirit of the invention.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a control mechanism according to the invention used for controlling the belt of a shuttleless power loom with a flexible belt, and FIG. 2 shows some parts of the control mechanism shown in FIG. 1 in more detail. FIG. 1...Flexible belt, 2...Gripper, 3...
2 hole, 4... toothed drive wheel, 5... 4 rotation axis,
8... cam, 9... cam, 10... loom shaft, 1
2...10 rotation axis, 13... (swingable) lever, 14... lever axis, 15 (18)...1
3 first (second) branch portion, 16...15 rollers,
17...16 rotation axes, 19...18 rollers,
20...19 axis of rotation, 21...13 arm, 2
2...4 shaft, 23...spur pinion, 24...
・Sector gear, 25...24 bosses, 26...axis,
27... Countersunk arm, 28... Connecting member, 29
, 30... Spherical bearing, joint, 31, 36... Spherical bearing surface, 32, 35... Annular element, 33, 3
4...Cylindrical recess, 37...Support member, ah...
Lock screw, 40...Casing.

Claims (9)

[Claims] (1) A flexible perforated belt (1) that is equipped with a weft insertion gripper (2) and passes over a toothed drive wheel (4) that is driven to rotate in alternate directions. In a control mechanism for a non-shuttle loom used in a non-shuttle loom having a non-shuttle loom, for each belt (1),
(b) at least one cam (8, 9) arranged on the shaft (10) of the shuttle powerless loom driven by continuous rotation about an axis (12) parallel to the linear motion of the said Axis (10)
(c) a lever (13) mounted so as to be swingable about an axis (14) parallel to the axis (12) of the first cam and adapted to cooperate with said cam (8, 9); The second joint (30) is connected to the arm (21) of the lever (13) which can swing by a second joint (29).
) drives the belt (1) with a toothed drive wheel (4)
(d) a connecting member (28) connected to a sector gear (24) mounted so as to be able to swing around an axis (26) parallel to the rotation axis (5) of the sector gear (24); a toothed drive wheel (
4) and a rotationally connected spur pinion (23). (2) In addition to the arm (21) connected to the connection member (28), the swingable lever (13) has two connections arranged on the shaft (10) that is driven by continuous rotation. According to claim 1, there are provided two branching parts (15, 18) with rollers (16, 19) respectively cooperating with said cams (8, 9) which are Control mechanism for a shuttleless loom. (3) The connecting member (28) is connected to the first spherical bearing type connecting member (28).
said lever (13) which can be swung by a joint (29);
is connected to the arm (21) of the fan-shaped gear (
Claim No. 24) characterized in that it is connected to
The control mechanism for a powerless shuttle loom according to either item 1) or item (2). (4) Connect the sector gear (24) to the connecting member (28).
an arm (27) on which said second joint (30) is located;
A control mechanism for a powerless shuttle loom according to any one of claims 1 to 3, characterized in that the control mechanism extends beyond its swing axis (26) in the vicinity of the loom. (5) On the one hand, the sector gear (24) itself and on the other hand, the protruding arm (27) connected to the connecting member (28) are connected to the swing axis (26) of the sector gear (24). Claim No.
4) The control mechanism for a powerless shuttle loom as described in item 4). (6) The position of the second joint (30) on the connecting member (28) is adjustable along the arm (27) from which the sector gear (24) extends. A control mechanism for a powerless shuttle loom according to claim 4 or 5. (7) The second joint (30) of the spherical bearing type of the connecting member (28) can be slid along the arm (27) from which the sector gear (24) extends, and Claim 1, characterized in that both are held in position by a support member (37) which is locked to said arm (27) by one screw (38). A control mechanism for a powerless shuttle loom comprising a combination of items (3) and (6). (8) The arm (27) from which the sector gear (24) extends is formed by two parallel branch parts, and the second arm (27) of the spherical bearing type is placed between these two branch parts. A supporting member (37) of the joint (30) is fixed at an adjustable position on each branched part by the locking screw (38) passing through the branched part. A control mechanism for a powerless shuttle loom according to item (7). (9) The arm (27) from which the sector gear (24) protrudes is formed into a rectangular shape, and its recess is directed toward the first joint (29) of the connecting member (28). A control mechanism for a powerless shuttle loom according to any one of claims (4) to (8).