CN1023331C

CN1023331C - Gripper strap with variable thickness for gripper looms

Info

Publication number: CN1023331C
Application number: CN90107361A
Authority: CN
Inventors: 鲁格·皮卓里; 古斯皮·卡斯托
Original assignee: Vamatex SpA
Current assignee: Vamatex SpA
Priority date: 1989-08-09
Filing date: 1990-08-09
Publication date: 1993-12-29
Anticipated expiration: 2005-08-09
Also published as: CN1049878A; IT1230810B; CS9003934A2; KR970008885B1; KR910004867A; JPH03137247A; ATE105879T1; SK279146B6; DE69008968D1; EP0412453A1; BR9003888A; DE69008968T2; DK0412453T3; JP2937434B2; EP0412453B1; CZ281780B6; IT8921482A0; ES2056318T3

Abstract

In a gripper strap for gripper looms, the thickness of the strap is gradually reduced, over at least part of its cross section, starting from an area close to the end carrying the gripper and extending towards the opposite end. In said strap, the notches into which engage the teeth of the wheel moving the strap follow at a variable distance, depending on the position taken up therein by the neutral bending axis.

Description

Gripper strap with variable thickness for gripper looms

The present invention relates to the improvement of the arrow shaft band of Rapier looms, just relate to control gripper head motion and control the improvement of arrow shaft band that weft yarn passes the shed open of modern loom thus.

As what known, because the improvement of the improvement-technology of these loom characteristics took in last year-provide a kind of structure particular importance that also becomes to the arrow shaft band, this provides a very effective guiding and also guarantee the high flexible state in the scope of maximal rate for gripper head, so that make the arrow shaft band be suitable for being reduced to minimum of a value around the required moment of torsion of gear that impels its motion and engage in its breach, thereby, the result reduces friction and wear, and has also reduced and the surperficial upward pressure that may crooked arrow shaft tape guiding piece contacts.

EP-B1-102588 has proposed solution to the problem that the rigidity of arrow shaft band varies along its length, and this solution is combining along the stuffing of its thickness of arrow shaft strip length and/or variable-width or liner arrow shaft being with habitual normal rigidity.

This solution be the arrow shaft of common characteristic with on adopt so that the result be than the desirable zone (for example near gripper head) that has more flexible arrow shaft band in its rigidity of increase.In addition, provide the arrow shaft band very high rigidity (cross section that normally has rib) simultaneously, be suitable for like this guaranteeing gripper head is led accurately, but this has been caused opposite problem again, just needed the arrow shaft region of high flexible to make that rigidity is corresponding to be reduced.This occurs on the loom that for example is equipped with the arrow shaft band, in this loom, system in the motion of shed open inner control arrow shaft band is the purpose of EP-A1-275469, it is characterized in that this system is to use the arrow shaft band with cross section with ribbing, it has a longitudinal fluting at least, and arrow shaft tape guide element has the bilateral guide of engagement arrow shaft with described groove.The arrow shaft band that is used for this system in fact also is to have rigidity especially, because its cross section with ribbing has very big gross thickness (need to form described groove, and allow suitably to engage described guide and at the shed open center arrow shaft band is led accurately).In addition, arrow shaft band and the setting to other planform also can produce similar situation.

The objective of the invention is to propose a kind of arrow shaft band, it can overcome the deficiencies in the prior art.

Now, the problem that varies along its length of arrow shaft band rigidity is with the method solution of original creation fully of the present invention.It provides arrow shaft band to loom, it is characterized in that, to small part arrow shaft band cross section, extends to its thickness of the other end since a zone of approaching to carry the end of gripper head and reduces gradually.

As usually taking place, if the arrow shaft band is the planform by reciprocating gear drive, the tooth of gear engages in the breach that forms along described arrow shaft band, according to the distance between the breach of the present invention can be shared according to neutral bending axis change in location.

Arrow shaft band according to the present invention preferably has the planform of vertical stiff rib, and its thickness only advantageously reduces in the corresponding part of described longitudinal rib, and the result makes the other end of the arrow shaft band opposite with the end of carrying gripper head have a smooth rectangle.

Arrow shaft tape thickness (the perhaps thickness of its rib) can be continuous and uniform, and perhaps either-or, scalariform is discontinuous, and the length of being with along arrow shaft reduces; It can be according to circumstances to pass the width of arrow shaft band and produce symmetry or asymmetric cross section uniformly or uneven in addition.

In illustrated embodiments, the flange that forms longitudinal rib in the zone of the arrow shaft strap end portion of carrying gripper head has constant thickness according to the present invention, and the cross section of arrow shaft band is C shape or flute profile; The flange that forms longitudinal rib in zone contiguous previous and extension therefrom has the thickness that reduces gradually; The arrow shaft band has rectangle or T section in the zone of the other end that the arrow shaft opposite with the end of carrying gripper head is with.

Now will be described in further detail structure of the present invention in the mode of some most preferred embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is the schematic diagram that is illustrated in the part coiling route of arrow shaft band in the Rapier looms;

Fig. 2 is the perspective view that has first embodiment of thickness continually varying arrow shaft band according to the present invention;

Fig. 3 is the side view of the arrow shaft band among the embodiment represented among Fig. 2;

Fig. 4 and Fig. 5 are the corresponding cutaway views of arrow shaft strap end portion (getting along IV-IV line and the V-V hatching of Fig. 3 respectively) among the embodiment with Fig. 2;

Fig. 6 is that wherein, thickness is that scalariform changes discontinuously according to the perspective view of the arrow shaft band of second embodiment of the invention;

Fig. 7,8,9,10th, the side view of the arrow shaft band among the embodiment of Fig. 6, three cutaway views are corresponding with its end and middle part;

Figure 11 is the perspective view according to the arrow shaft band of the 3rd embodiment of the present invention;

Figure 12,13,14th, the side view of the arrow shaft band of the embodiment of Figure 11, two cutaway views are corresponding with its end;

Figure 15 illustrates arrow shaft band among Fig. 2 and gears engaged and by the situation of gear drive;

Figure 16 is the plane that the arrow shaft of any one embodiment of Fig. 2 to 15 is with, and clearly, the distance of variation is set between breach, and wherein, the tooth of gear engages in these breach.

With reference to accompanying drawing, can see that by Fig. 1 the arrow shaft band that carries the warp thread shed open of gripper head by loom T is by common guider P ₁And P ₂Effect to make its part attach to corresponding part on the gear R of its motion of control be how to have flexiblely especially, wherein, the tooth of this gear R engages in the breach of arrow shaft band.According to the present invention, under the situation of the arrow shaft band of special rigidity, this must be by obtaining from begin to extend to the thickness that the other end 4 reduces the arrow shaft band gradually near a zone 2 of carrying the end 3 of gripper head to the cross section of small part arrow shaft band.

In the represented embodiment of accompanying drawing, in order at the shed open center gripper head to be carried out correct guidance, arrow shaft band N has the planform of channel-section according to the present invention, and it has vertical stiff rib 1 of side.

The shape of the arrow shaft band N that Fig. 2-5 is represented is such, have only the thickness of rib little by little and flatly to reduce, so that eliminate fully in its end 4 corresponding parts, yet the remainder of arrow shaft band N still keeps its thickness constant, therefore described arrow shaft strap end portion 4 has complete rectangle and relatively thinner symmetrical section (Fig. 5), and it is suitable for fully guaranteeing that arrow shaft being with has in this zone very high flexible.Flexible in contiguous zone is similarly, however the rigidity of arrow shaft band will little by little become greatly to the end 3 of carrying gripper head, and begin attenuation in described end 3 and regional 2(rib 1 from this zone 2) between have its maximum ga(u)ge.

Represented arrow shaft band similar with shown in Fig. 2-5 among Fig. 6-10, the difference unique with the above embodiments is that the thickness of this arrow shaft band is discontinuously along its total length, the rock bench variation.Therefore first length that has maximum uniform thickness is the corresponding part (its cross section is shown in Fig. 8) at the end regions that carries gripper head, subsequently, one the point 6 and 7 between-be the length (its cross section is shown in Figure 9) of the thickness of a rib that reduces, then-to surpass a some 7-be a last length 9, in this length 9, rib 1 is disappeared, and the arrow shaft band have a thin square-section (Figure 10).In this case, the arrow shaft band cross section that also always keeps a symmetry.

At last, rib 1 its thickness of arrow shaft band is again flatly to reduce gradually in the embodiment of Figure 11-14, but described reduce be significant-compare with the arrow shaft band of the embodiment of Fig. 2-5, the other end 10 opposite with the end 3 of carrying arrow shaft band has a T section, as represented in Figure 14.

Present that narrate and shown in arrow shaft band in, the cross section is a symmetry fully, yet the thickness of the arrow shaft band in cross section with ribbing or not with ribbing is reduced on its width unevenly, in this case, the cross section of arrow shaft band can be asymmetric.

As the front narrate and shown in arrow shaft band in, must pay special attention to along its distribution of lengths breach, and the tooth of the gear of control arrow shaft band motion engages in these breach.

In fact can know, at arrow shaft band N when gear R reels, the position of the neutral bending axis of arrow shaft band is (Figure 15) that is consistent with the pitch circle of gear, and the result is to be determined by the pitch circle of the tooth of described gear and the ratio of the number of teeth along the distance between the breach of arrow shaft band.

On the other hand, the same with variation on the material at geomery as the arrow shaft band, its neutral bending axis occupies different positions.According to the present invention, when the arrow shaft tape thickness changes with aforesaid mode or different modes on its length, especially can this thing happens.

Therefore, when arrow shaft band is reeled around the gear of its motion of control, should on the arrow shaft strip length, change in order to prevent the distance between arrow shaft band elongation one can see that the tooth of coiling pitch circle variation-gear when neutral bending position changes engages in breach the breach.

The present invention obtains like this, so that arrow shaft band proper exercise :-just as shown in Figure 16 the same-with mutual equidistance (P) the formed breach 11 along arrow shaft band N is set carrying gripper head and have in the zone 3 of uniform thickness, and the thickness that reduces gradually (especially shown in situation under, arrow shaft is with the thickness of two side ribs 1) arrow shaft region 2 in the mode that increases distance (PV) described breach is set.

Claims

1, be used for the arrow shaft band of Rapier looms, it is characterized in that, to small part arrow shaft band cross section, from beginning to extend to the other end near a zone of carrying the end of gripper head, its thickness reduces gradually.

2, arrow shaft according to claim 1 band, it is characterized in that along its thickness of arrow shaft strip length to reduce be continuously and uniformly.

3, arrow shaft according to claim 1 band, it is characterized in that along its thickness of arrow shaft strip length to reduce be discontinuous.

4, arrow shaft according to claim 1 band, what it is characterized in that thickness reduces to be to pass equably the arrow shaft bandwidth.

5, arrow shaft according to claim 1 band, it is characterized in that in the arrow shaft band and the described breach of the tooth engagement of driven wheel between distance whole arrow shaft with on change.

6, be used for the arrow shaft band of the version with vertical stiff rib of Rapier looms, it is characterized in that, in the corresponding part of described longitudinal rib, begin to extend to the other end from the zone of the end of approaching to carry gripper head, its thickness reduces gradually.

7, arrow shaft band according to claim 6 is characterized in that, along the arrow shaft strip length, reducing of its thickness is continuously with uniformly.

8, arrow shaft band according to claim 6 is characterized in that along the arrow shaft strip length, reducing of its thickness is discontinuous, scalariform.

9, arrow shaft according to claim 6 band, what it is characterized in that thickness reduces to be to pass equably the arrow shaft bandwidth.

10, arrow shaft band according to claim 6 it is characterized in that the flange that forms described rib in the end regions that carries the arrow shaft band has constant thickness, and the cross section of arrow shaft band is C shape or flute profile; The flange that forms described rib in being adjacent to arrow shaft band edge zone previous and that extend thus has the thickness that reduces gradually, and the cross section of arrow shaft band is C shape or flute profile, and has the square-section in the zone of the arrow shaft band other end opposite with the end of carrying gripper head.

11, arrow shaft band according to claim 6 is characterized in that, the flange that forms described rib in the end regions of the arrow shaft band that carries gripper head has constant thickness; And the cross section of arrow shaft band is flute profile or C tee section, and flange has the thickness that reduces in being adjacent to arrow shaft region previous and that extend therefrom, and arrow shaft band cross section is C shape or flute profile, subsequently, is a square-section part, is the T section part then; In the arrow shaft band other end zone cross section opposite with the end of carrying gripper head is T shape.