CN85104954A

CN85104954A - The mechanism of control movements of weft insertion members in the shuttleless loom

Info

Publication number: CN85104954A
Application number: CN 85104954
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: 1987-01-07
Also published as: CN85104954B

Abstract

In a kind of mechanism that controls the motion of weft insertion rapier in the shuttleless loom, the front and back of the gear wheel of a control arrow shaft band are rotated and are produced by a varying pitch cam screw rod; This screw rod with one along the slide shaft that seesaws of constraint rectilinear orbit to intersecting, be equipped with on this sliding part and the spiral shell tooth engagement of described screw rod and the device that makes it to rotate, this device comprises several to relative sliding slider.

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 of carrying 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 engaging of sliding part 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 sample one 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 any problem that is associated with the loom speed raising, 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 of slide block (sliding part does not show) of the spiral shell flank engagement state that is in above-mentioned screw rod 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 that the cam of the above-mentioned part of transmission is passed motion); 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 its axial line of the unified axle of crank (not shown) A(that has slide block 6 is 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, one end and gear wheel 3 join, the other end is installed with free to rotately: a sliding part 8, sliding part 8 intersects with above-mentioned screw rod, link 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 the cam screw rod 7 different 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 on work surface 15 with involute contour.The spiral shell flank of tooth of making the 15 fens screw rods 7 in surface cooperates because the swing of slide block, involute contour make slide block can and the spiral shell flank engagement of above-mentioned screw rod so just formed extremely effectively connecting 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, therefore, and in each moment of slide block one screw engages, can both there be its bending radius symbol identical, the much the same contact surface of bending radius size and above-mentioned screw rod.The engagement that obtains has like this enlarged loading end, and its loading end is wide more than the known mechanism that uses rolling engagement way (particularly steel roller), thereby pressure has correspondingly reduced.Wearing and tearing have also reduced.

For making the result that device of the present invention is obtained that a concept be arranged, notice that following truth 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, and this can reflect significantly that it passes through the axis oscillating around himself. With the situation that the profile of tooth of screw rod 7 meshes perfectly, slide block has the involute surface 15 of self. Therefore, although the pitch of screw rod changes, 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 one metal or metal one plastics obtains at 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 characterized in that: be equipped with on the described sliding part and the spiral shell tooth engagement of described screw rod and the device that makes it to rotate; This device comprises several to relative swing slide block.

2, as in the claim 1 described mechanism; The slidingsurface of described 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.