CN85104954B

CN85104954B - Mechanism to control the movements of weft insertion members in shuttleless weaving looms

Info

Publication number: CN85104954B
Application number: CN85104954A
Authority: CN
Inventors: 卢吉·佩佐利
Original assignee: Vamatex SpA
Current assignee: Vamatex SpA
Priority date: 1985-06-28
Filing date: 1985-06-28
Publication date: 1988-12-14
Also published as: CN85104954A

Abstract

In a mechanism for controlling the motion of a weft insertion rapier in a shuttleless loom, the back-and-forth rotation of a big gear for controlling a rapier band is generated from a varying-pitch cam screw rod; the screw rod is axially crossed with a sliding part making a back-and-forth motion along a constraint straight track, and the sliding part is provided with a device which meshes with the screw rod and enables the screw rod to rotate. The device comprises a plurality of pairs of sliding block sliding oppositely.

Description

The mechanism of control movements of weft insertion members in the shuttleless loom

In the common mechanical, and in the many patent applications that comprise most of technical field, the bolt and nut mechanism of the transmission campaign of knowing is arranged.These mechanisms generally all adopt the screw rod of constant pitch, still, in some occasion, when needs are followed the special characteristics of motion, will adopt the mechanism of the screw rod with varying pitch.

Just be used to obtain the mechanism that cuts the forward travel of latitude element (bar or similar elements) in shuttleless loom (promptly the loom of confession latitude) continuously race several years ago and be a special shape in this class mechanism.In this mechanism, the reciprocal rotation of the gear wheel of the motion of control arrow shaft band is that the similar motion by a varying pitch cam screw rod obtains, this varying pitch cam screw rod and one are intersected along a reciprocating sliding part of constraint rectilinear orbit, there is a device to be used for making sliding part to engage with screw rod, like this, the rotation that just can produce screw rod by the rectilinear motion of sliding part, or opposite.

In hitherto known structure, above-mentioned making in sliding part and the device that screw rod engages always has rolling element, the roller that is contained on the sliding part especially arranged, the spiral shell tooth engagement of roller and cam screw rod.This way provides satisfied result, and has improved the performance of shuttleless rapier loom widely.Because it is more and more high to increase the conditional request of loom speed correspondence, has recently proved that this way is not enough.In fact, under the situation that revolving speed of knitting machine improves, wearing and tearing become too high, may be that the rolling of above-mentioned roller on the spiral shell flank of tooth of screw rod reduces or do not roll caused owing to surpass after some velocity amplitude.

The applicant overcomes the research that such shortcoming does to find, (be easy to mesh with having suitable profile with screw tooth surface, correspondingly have a very wide loading end) the swing slide block replace known tourelle (loading end on the spiral shell tooth is very little), just can shockingly solve problem any and loom speed raising phase relation connection, even under the very high situation of the running speed of mechanism, also wearing and tearing can be reduced to the degree that to accept fully.

Therefore, the present invention relates to the mechanism of control weft insertion rapier motion in a kind of shuttleless loom, in this mechanism, the front and back of the gear wheel of a control arrow shaft band are rotated by a varying pitch cam screw rod and are produced, varying pitch cam screw rod and a slide shaft of doing to seesaw along a constraint rectilinear orbit are to intersecting, this mechanism is characterised in that described sliding part has the device that is meshed and makes it to rotate with the spiral shell flank of tooth of described screw rod, and this device comprises several to relative swing slide block.

More preferably, for this mechanism in the cam screw engages, the surface of involute is done or had to above-mentioned slide block, is easy to the spiral shell flank engagement with above-mentioned screw rod like this, the swing of slide block also helps engagement.

Now will be only by way of example, and the present invention is described in further detail with reference to accompanying drawing, accompanying drawing is illustrated in the most preferred embodiment of correspondence of the present invention, wherein:

Fig. 1 is the assembled view with the corresponding mechanism of the present invention;

Fig. 2 illustrates the detailed structure with the slide block (sliding part does not show) of the spiral shell flank engagement state of above-mentioned screw rod of being in of varying pitch cam screw rod and two pairs of symmetries;

Fig. 3 is the front view that shows several details to sliding shoe and cam screw engages;

Fig. 4 is a partial cross sectional views of engagement situation shown in Figure 3.

According to the present invention, mechanism for the control weft insertion device P forward travel in the loom (not shown) of latitude forms (Fig. 1) by following part continuously: a solid metal machine frame 1, machine components are housed on it, these machine components rotatablely move as straight reciprocating motion is converted to (such as, the motion of the small end of connecting rod 2 perhaps can also be the cam transmission campaign of the above-mentioned part of transmission); A gear wheel 3, above-mentioned part circles round in the future and transports the moving gear wheel 3 that is passed to, tooth 4 on the gear wheel 3 is with the otch f on the N to mesh with the arrow shaft of control weft insertion device P, track is only reciprocating along a straight line to make the small end 2A of this arrow shaft band movable connecting rod 2, and its big end 2B is connected on the crank pins 5 of slide block 6, slide block 6 is contained on the crank, and this crank and connecting rod 2 have constituted connecting rod one crank mechanism.This crank (not shown) that has a slide block 6 around its axial line of A(shown in the chain-dotted line among Fig. 1) rotate, axle A can be the main shaft of loom, it can also be other the countershaft (except connecting rod one crank mechanism, this loom shaft also can be controlled a cam gear) that has same speed with main shaft.

According to the present invention, the reciprocating part of rotation of using straight reciprocating motion with the small end 2A of connecting rod 2 to be converted to gear wheel 3 in the frame 1 mainly contains: a cam screw rod 7, and one end and gear wheel 3 join, and the other end is installed with free to rotately; A sliding part 8, sliding part 8 intersects with above-mentioned screw rod, links to each other at 2A with connecting rod 2, because the effect of connecting rod 2, sliding part 8 moves along the direction of parallel screw; A pair of slide block 9, slide block 9 is packed on the sliding part 8, and slides in can be on frame 1 parallel with cam screw rod 7 guide rail; Several to slide block 10, slide block 10 is contained on the above-mentioned sliding part, has set up the connecting relation between the spiral shell tooth of sliding part 8 and screw rod 7, thus at sliding part 8 when himself rectilinear orbit moves, make above-mentioned screw rod 7 rotate.

According to the present invention, slide block 10 opposed in pairs (Fig. 2), each spiral shell tooth even to slide block and cam screw rod 7 accurately meshes.Slide block is contained in neck bush 11 the insides (Fig. 2), can swing back and forth around the axis 12 that favours axle 13, and this neck bush is fixed on the sliding part 8 with axle 13, perpendicular to the axis of screw rod 7.Slide block 10(is referring to Fig. 3 and Fig. 4) constitute by the metal structure 14 of outer surface 15 with involute contour.Outer surface 15 cooperates with the spiral shell flank of tooth of screw rod 7 because the swing of slide block, involute contour make slide block can with the spiral shell flank engagement of above-mentioned screw rod, so just formed the extremely effectively connection between the spiral shell tooth of slide block and screw rod.By continuous swing, slide block 10 makes all the time and oneself keeps and the tooth shape of screw fit that is changing, and therefore, in each moment in slide block one screw engages, can both maintain an excellent contact surface.The engagement that obtains has like this enlarged loading end, and its loading end is wide more than known mechanism with rolling engagement way (particularly steel roller), thereby pressure correspondingly reduced, and wearing and tearing have also reduced.

For making the result that device of the present invention is obtained that a notion be arranged, notice that the following fact is just enough.Under very high special test speed, after the fortnight work of 24 hours every days, a kind of wearing and tearing of roller mechanism of well-known types have exceeded the maximum degree that can accept and have damaged.Corresponding to slide block mechanism of the present invention wear problem does not appear then, because its attrition value has been reduced to the degree that slide block mechanism was kept 20,000 hours under same speed.

The characteristics of slide block have clearly been expressed in Fig. 3 and Fig. 4, this can reflect significantly that it passes through the axis swing around himself, the situation that meshes with the profile of tooth of screw rod 7 perfectly, slide block has the involute surface 15 of self, therefore, although the pitch of screw rod is friendshipization, but still can realize the closest and the most effective connection.

The present invention also has the concrete device of some other reality, and this is understandable, and that also is to belong to protection scope of the present invention.For example, without metal structure, slide block also can be made of suitable synthetic plastics material, and perhaps its composite construction with metal-metal or metal-plastic obtains on insert with the involute surface of screw tooth surface engagement.

Claims

1, a kind of by a reciprocal rotation that comes the gear wheel of production control arrow shaft band to the varying pitch cam screw rod that intersects with a slide shaft of on the constraint rectilinear orbit, moving, the mechanism of the motion of control weft insertion members (as weft insertion rapier) in the race of shuttleless loom is equipped with on the sliding part and the spiral shell tooth engagement of described screw rod and the device that makes it to rotate; It is characterized in that: the above-mentioned device that makes it to rotate comprises several slide blocks to relatively swinging back and forth around the axis (12) that favours the axle (13) vertical with screw rod, the slidingsurface of slide block is the involute contour face, because the swing of slide block, the involute contour face is easy to the spiral shell flank engagement with the cam screw rod.