Abstract
A cable tie mounting tool comprises an upstream jaw and a downstream jaw having concave guidance path portions for the strap of a cable tie, a placing mechanism configured to place a cable tie portion along the common concave guidance path by pushing it strap-end-first along the common concave guidance path starting at the upstream end of the upstream jaw and pushing it in downstream direction, an insertion mechanism for feeding the cable tie strap end of the placed cable tie through the head of the placed cable tie, and a tightening mechanism for tightening the cable tie and possibly cutting it. Also provided is a length adjustment mechanism for adjusting the length of the common concave guidance path.
Claims
1. A cable tie mounting tool, comprising: an upstream jaw having a concave upstream guidance path portion for a strap of a cable tie with a first upstream end and a first downstream end seen along a guidance direction; and a downstream jaw having a concave downstream guidance path portion for the strap of the cable tie and a pivotable path portion attached to the downstream jaw, the pivotable path portion configured to rotate about a pivot on the downstream jaw, the downstream jaw having a second upstream end and a second downstream end, wherein the upstream jaw and the downstream jaw are movable relative to each other such that the first downstream end and the second upstream end may be close to each other or remote from each other, thereby forming a common concave guidance path for the strap of the cable tie when being close to each other; wherein the pivotable path portion is configured to feed a strap end of the cable tie through a cable tie head of the cable tie and adjust a length of the common concave guidance path and wherein a length of the common concave guidance path is adjusted by moving the upstream jaw and the downstream jaw relative to each other and a first pivoting movement of the pivotable path portion around the pivot relative to the downstream jaw in a radially inward or radially outward direction.
2. The cable tie mounting tool according to claim 1, wherein a second pivoting movement of the pivotable path portion around the pivot in the radially inward or the radially outward direction is performed to feed the strap end of the cable tie through the cable tie head of the cable tie.
3. The cable tie mounting tool according to claim 2, wherein a pivot of the pivotable path portion is nearer to an upstream end of the pivotable path portion than to a downstream end.
4. The cable tie mounting tool according to claim 2, wherein the pivotable path portion is provided at the downstream jaw.
5. The cable tie mounting tool according to claim 1, further comprising a drive mechanism for the pivotable path portion, the drive mechanism having a linear drive configured for selectively driving the pivotable path portion two or more steps in series.
6. The cable tie mounting tool according to claim 1, further comprising a lever on the pivotable path portion, extending radially outward, and a linear drive attached to said lever, the linear drive configured for stepwise moving the pivotable path portion.
7. The cable tie mounting tool according to claim 1, wherein the upstream guidance path portion and the downstream guidance path portion have a different length.
8. The cable tie mounting tool according to claim 7, wherein the downstream jaw is longer than the upstream jaw.
9. The cable tie mounting tool according to claim 1, wherein the path portion and a drive mechanism of the pivotable path portion are arranged to guide the strap end of the cable tie towards varying positions along the fixed path portion depending on a pivot position of the pivotable path portion.
10. The cable tie mounting tool according to claim 1, wherein one or more of the path portions have a U-shaped contour, the U-shaped contour being open in a radial inward direction.
11. The cable tie mounting tool according to claim 10, configured for handling cable ties of variable length with a minimum length of 90 mm and a maximum length of 220 mm.
12. The cable tie mounting tool according to claim 10, wherein the pivotable path portion is configured to reduce the common concave guidance path length from its maximum length to 80% of the maximum length.
Description
BRIEF DESCRIPTION OF DRAWINGS
(1) The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.
(2) FIG. 1 shows a perspective view of the head part of a tool for mounting cable ties according to an embodiment of the invention;
(3) FIG. 2 shows a side view of the tool for mounting cable ties of FIG. 1 with jaws in an open position according to an embodiment of the invention;
(4) FIG. 3 shows a side view of the tool for mounting cable ties of FIG. 1 with jaws in a closed position together with further schematic features according to an embodiment of the invention;
(5) FIGS. 4a to 4c show various positions of a pivotable path portion of the tool for mounting cable ties of FIG. 1 according to an embodiment of the invention;
(6) FIG. 5 shows an operation diagram for the tool for mounting cable ties of FIG. 1 according to an embodiment of the invention; and
(7) FIGS. 6a & 6b shows constructional details of the tool for mounting cable ties of FIG. 1 according to an embodiment of the invention.
DETAILED DESCRIPTION
(8) FIG. 1 shows the head part of a tool for mounting cable ties. Not shown are several components of the tool that are required for its operation, such as a tool body, a supply mechanism for the cable ties, a cutting mechanism, a tightening mechanism, operating switches, drives and the like. FIG. 1 shows the jaw portion of the tool as it may sit on the left side of an appropriately configured tool.
(9) Reference numeral 10 symbolizes the items to be tied by a cable tie. For simplification it is drawn as a cylinder, but usually it is a bunch of cables, tubes and the like to be tied together. 11 is the upstream jaw with its upstream end 11u and its downstream end 11d. Numerals 12, 13 and 14 constitute together the downstream jaw with its upstream end 12u and its downstream end 12d. Both are shown to be pivotable around their respective pivots 11p and 12p. Their pivoting movement is used for opening and closing the jaws, opening being such that the downstream end 11d of the upstream jaw 11 and the upstream end 12u of the downstream jaw 12, 13, 14 are remote from each other so that the items to be tied 10 can get into the opening defined by the two jaws.
(10) The upstream jaw 11 defines and forms an upstream guidance path 99a. The downstream jaw 12, 13, 14 defines and forms a downstream guidance path 99b, 99c. The guidance path is for guiding the strap 62 of a cable tie 61-63.
(11) FIG. 6 shows schematically the situation where a cable tie 61, 62, 63 is placed along the guidance path 99 constituted by the guidance path portions 99a, 99b, 99c. For the sake of clarity, FIG. 6 shows the strap portion 62 of the cable tie a little bit radially inward distant from the guidance path portions 99a, 99b, 99c. But in real operation, the strap portion 62 will abut at least along long portions of the guidance path 99, noting that at certain portions, particularly at edgy portions of the overall guidance path 99, it may lift off from the guidance path.
(12) A cable tie head with the opening therein indicated by the dashed channel 61a. The situation in FIG. 6 is a situation where the cable tie strap end 63 is placed opposite of and immediately adjacent to the cable tie head 61, particularly the opening 61a therein. This is achieved by the operation of a not shown insertion mechanism for the cable tie into the guidance path which may sit upstream of the upstream end of the upstream jaw. The insertion direction and insertion position of the cable tie towards the guidance path 99 is indicated by arrow H in FIG. 6a. 64 symbolizes a tightening device. It may consist of rollers catching the end once reaching through the opening 61a and may tighten it and pull it as far as pre-set criteria allow it. 65 symbolizes a cutting tool for cutting off the tail end at the downstream side of the cable tie head 61.
(13) Support 15 symbolizes a support in the sense of a fixation point and may be seen as a part of the overall machine or machine body carrying the mentioned components. Particularly, the pivots 11p and 12p are attached to support 15. The support may consist of plural members fixedly or movably attached to each other.
(14) The downstream jaw 12, 13, 14 may be formed by one or more holders 12, 12l, 12r. FIG. 1 shows a left side holder 12l and a right side holder 12r between which members are held that contribute to forming the guidance path. All the jaws 11, 12, 13, 14, guidance path portions 99a, 99b, 99c and holders 12l, 12r are of concave shape such that they encompass an opening in which the items to be tied 10 come to rest once the jaws are closed.
(15) FIG. 2 shows the situation of FIG. 1 in side view. In addition, arrows A, B and C indicate certain movements. When using the tool in a cable tie mounting method, the tool may be brought towards the item to be tied 10 along the direction indicate by arrow A. In this state, the jaws are open as shown, but will, once the correct position is taken, be closed along the directions of arrows B and C. Although the figures show constructions where both jaws are movable/pivotable, it may well be that only one of them is movable/pivotable. Instead of pivoting movements, also translational movements could be considered.
(16) FIG. 3 shows the jaws in a closed state. Then, the downstream end 11d of the upstream jaw 11 is close to, and possibly abuts at, the upstream end 12u of the downstream jaw 12, 13, 14.
(17) FIG. 3 also shows schematically various drives. It shows drives 17 for the downstream jaw 12, 13, 14, and drive 18 for the upstream jaw 11. They may be distinct drives, possibly individually controllable, or may be attachments to a common gear or the like. FIG. 3 shows an embodiment where the drives 17, 18 of the jaws 11, 12, 13, 14 could individually be controlled by a controller 19. But as said, also other constructions are conceivable. FIG. 3 further shows a drive 16 for the pivotable path portion 13, 99b, pivoting, in the shown embodiment, around its pivot 13p at the upstream end 12u of the downstream jaw 12, 13, 14. Drive 16 may be a linear drive attached to a lever 13a extending radially outward away from the pivotable path portion 13. The linear drive may push the lever 13a in horizontal direction in FIG. 3 and thus may pivot the pivotable path portion 13, 99b around pivot 13p. 16b indicates the attachment of the drive 16 to the tool at a certain appropriate location. Attachment may be at the tool body as symbolized by support 15, but could also be rigid with respect to a portion of the downstream jaw 12-14, for example at holders 12r and/or 12l.
(18) Various operational states of the pivoting path portion 13, 99b will now be described with reference to FIGS. 4a, 4b and 4c. Said figures do not show the various drives. But they are provided as explained with reference to FIG. 3. FIGS. 4a, 4b, 4c show only the jaws 11, 12, 13, 14, with the right side holder 12r of FIG. 1 left away for the sake of a clear visualization. For the same reason, the items to be tied 10 are not shown in FIGS. 4a, 4b and 4c, although they are present during regular use.
(19) The pivotable path portion 13, 99b comprises a rail-like member 13b of concave shape bearing on its concave inner surface the actual guidance path portion 99b that is pivotable and has an upstream end 99bu and a downstream end 99bd. The pivot 13p is at the upstream end of the pivotable path portion 13, 99b and is also at the upstream end of the downstream jaw 12, 13, 14, as shown. At the distal ends (downstream end 11d of upstream jaw 11 and upstream end 12u of downstream jaw 12, 13, 14) the two path portions 99a of the upstream jaw 11 and 99b of the pivotable path portion 13, 99b are more or less contiguous, and a cable tie strap pushed along said path in downstream direction, i.e. from the upstream end flu of the upstream jaw 11 and then travelling in clockwise direction in FIG. 4a, will easily and reliably pass the transition between the path portions 99a and 99b.
(20) As also shown in FIG. 4a the downstream end 99bd of the pivotable path portion 13, 99b, is close to the fixed guidance path portion 99c, and accordingly the cable tie strap also will easily pass from the pivotable path portion 99b towards the fixed path portion 99c.
(21) In FIG. 4a, the upstream path portion 99a is shown by dashed lines. It can be understood as being hidden behind the sidewalls for sideways confining and guiding a strap travelling along the guidance path. Substantially the same applies with respect to the fixed guidance path portion 99c.
(22) In FIG. 4a, the pivotable path portion 13, 99b is shown in the most retracted position, i.e. radially most outward position during regular use. This implies also that the lever 13a is, in FIG. 4a, in its left most position during regular use. In such a position, the inner holder contour of the holders 12l, 12r may be the confining contour of the opening defined by the closed jaws and surrounding the items to be tied 10. In this position, the length of the overall guidance path 99a, 99b, 99c is maximum because the guidance path runs along the maximum loop dimension in the downstream jaw 12, 13, 14.
(23) It is pointed out in this context that all the FIGS. 1, 2, 3, 4a, 4b and 4c show that the downstream jaw 12, 13, 14 has the overall longer guidance path portion constituted by the two path portions 99b, 99c of the pivotable path portion 13, 99b and the fixed path portion 14, 99c. Together, they are longer than the guidance path portion 99a of the upstream jaw 11. The downstream path portions define, together a bent similar to a U-shape or horseshoe, bending a cable tie running around said path portion for around 180°, or more general between 140° and 220°. In contrast, the upstream jaw 11 has the shorter path portion 99a, which bends the cable tie strap for a lower angle which may below 110° or below 90° or below 80°.
(24) But different from the shown embodiments, the downstream jaw may hold the shorter path portion and the upstream jaw may carry the longer path portion, and could then also carry the pivotable path portion, then again pivotably held at its upstream end.
(25) FIG. 4b shows the pivotable path portion 13, 99b in a more inwardly pivoted position. Compared to FIG. 4a, the lever 13a was pushed by the not shown drive 16 in the direction of arrow D, i.e. rightward in FIG. 4b, this leading to a corresponding downward movement of the downstream end 99bd of the pivotable path portion along the direction of arrow E. Accordingly, the tangential extension of the downstream end of the pivotable path portion points to another position along the fixed path portion 99c. A gap between the two path portions widens. But the situation is still such that the leading end of the travelling cable tie strap 62 will reliably be caught by the fixed path portion 99c for further guidance there. Looking at the upstream end of the pivotable path portion, the transition between it and the upstream path portion 99a is more edgy than in FIG. 4a, but still such that it can be passed by the leading portion 63 of the cable tie strap 62.
(26) Altogether, in FIG. 4b the guidance path length is decreased because the pivoted path portion “shortcuts” the maximum loop so that the overall length becomes shorter. Whereas the positioning shown in FIG. 4a could be suitable for the longest possible cable ties, the positioning of FIG. 4b could be suitable either for shorter cable ties before inserting their free end into the head of the cable tie, or could be suitable for inserting the end of the longest possible cable tie into its head. The movements indicated by FIG. 4b were induced by the not shown drive 16, possibly under control of controller 19.
(27) FIG. 4c shows an again further pivoted position of the pivotable path portion 13, 99b. At the transition between upstream path portion 99a and pivotable path portion 13, 99b, an edge occurs. But constructions can be made such that a passing end 63 of a cable tie strap 62 reliably gets across the edge. At the downstream end 99bd of the pivotable path portion, the gap between it and the downstream fixed path portion 99c has increased. But still, the arrangement is such that the leading end 63 of a cable tie strap 62 will safely be caught by the fixed path portion 99c.
(28) Movement of the pivotable path portion 13, 99b was such that the lever was again moved rightward as indicated by the direction of arrow F, and the downstream end 99bd thereof travelled downward along the of arrow G. Through this further pivoted position an even greater portion of the maximum available opening is shortcut, so that the guidance path length has again decrease compared to FIG. 4b and FIG. 4a. Assuming that the position shown in FIG. 4c is the most inward position of the pivotable path portion 13, 99b during regular use, it is a position assumed when the end of a cable tie strap has been pushed through the cable tie head for a short strap length. Again, the movements indicated by FIG. 4c were induced by the not shown drive 16, possibly under control of controller 19.
(29) FIG. 5 is a diagram for showing operational methods of the described tool. The abscissa 51 shows qualitatively various pivoting positions P1, P2, . . . , P8, Pmin of the pivotable path portion 13, 99. P1 is most outward, Pmin most inward. The ordinate 52 shows elapsed time. It may be assumed that P1 correspond to the position shown in FIG. 4a, and, for example, P5 is the position shown in FIG. 4b, and Pmin is the position shown in FIG. 4c. More distinct positions than those shown in FIGS. 4a, 4b and 4c are possible and are indicated in FIG. 5 by the intermediate positions on the abscissa. The control may be such that these pivoting positions can be selected and then adjusted by drive 16.
(30) In a first operational example, it is assumed that relatively long cable ties are to be mounted. A slightly reduced guidance path length corresponding to position P3 would be suitable for positioning the cable tie strap end right opposite of and adjacent to the opening in the cable tie head. It is further assumed, that position P5 would be the position sufficient for inserting the cable tie strap end into and through the cable tie head and into the reach of a tightening mechanism.
(31) In operation, then, in a first step 53-1, the pivotable path portion is brought to position P3. Then, or before that, the tool can be brought to the mounting side and the jaws can be closed. Then, the cable tie is inserted into the guidance path. Once this is achieved, a movement 53-2 of the pivotable path portion towards position P5 follows for pushing the cable tie strap end 63 through the cable tie head 61 toward the reach of the tightening mechanism 64. Once this is done, the pivotable path portion retracts by movement 53-3. Then, the jaws are opened, the tool is displaced to a new mounting site, the jaws are closed and then the reversing operation between positions >>P5>>P3 is repeated by movements 53-4 and 53-5. The reversing movements 53-2 to 53-5 are relatively short since they must cover only the distance necessary for the cable tie end 63 to travel from the position immediately in front of the cable tie head opening 61a through said opening towards the reach of the tightening mechanism 64. This may be called work time tw of jaws, as indicated in FIG. 5. The dead time td is the time required for operating the jaws, namely opening and closing them, and displacing the tool as required.
(32) Further down in FIG. 5 an example is assumed where the shortest possible cable tie is used, a position P8 being suitable for placing the tie. Then, a relatively long guidance path adjustment step 53-10 towards position P8 is required, and from there on the reversing movements between P8 and P9min ensues as described earlier. On the time line, after making the first adjustment towards position P8, the same timings as mentioned earlier are required.
(33) So far, an operation method with distinct adjustment steps and inserting steps has been described. Variable is the first step for adjusting the guidance path length to the length of the mounted cable ties, whereas the various movements of the pivotable path portion 13, 99b thereafter, as indicated by 53-2 to 53-5, are the same because they must cover the same distance from upstream of the cable tie head opening 61a to downstream thereof into the reach of a tightening mechanism 64. Correspondingly, FIG. 6a shows the situation after a cable tie 61, 62, 63 has been placed along the guidance path 99 and before the required insertion activity is executed, this activity corresponding to movements 53-2 and 53-4 in FIG. 5. This would be a downward pivoting movement of the pivotable path portion 13, 99b, pivotably held at pivot 13p, and a reverse upward pivoting.
(34) The lower portion of FIG. 5 shows another operation method. There, no distinct guidance path length setting is made. For example, when inserting the cable tie, the guidance path length may always be the same, i.e. maximum, irrespective of how long or short the used cable ties are. Then, after placing the cable tie along the guidance path portion, the reversing steps for pushing the cable tie strap end through the cable tie head opening 61a into the reach of a downstream tightening mechanism 64 may have different length depending on the length of the cable tie. Short cable ties will require a longer step, whereas longer cable ties will require a shorter step. In FIG. 5, it is assumed that position P7 is the position required for feeding the cable tie strap end through the cable tie head 61a into the reach of the tightening mechanism 64. Then, the reversing movements are longer. This increases the work time tw. The dead time td, however, remains the same. The longer reversing operations are shown with reference numerals 53-6, 53-7, 53-8 and 53-9. In the operation mode shown in the lower portion of FIG. 5, provisions must be taken for appropriately setting the target position P7. This may be made by a suitable control or may be accomplished by some kind of self-adjusting mechanism, such as force dependent, or may be feedback controlled, or the like.
(35) FIG. 6b is a cross section of the various guidance path portions 99a, 99b, 99c the downward direction in FIG. 6b is the radial outward direction of the loop formed by the guidance path. 62 is the cross section through the cable tie strap it abuts to the radial inside surface of the respective components, particularly upstream jaw 11, pivotable path portion 13, fixed path portion 14. Sidewalls 66, 67 maybe provided over parts or the entire length of the path portions for avoiding sideways escape, which would be, in FIG. 6a, vertical to the drawing plane. At the pivotable path portion, the sidewalls 66, 67 may be formed by the holders 12l, 12r, and would then be separate members.
(36) Altogether, the described tool may be configured for handling cable ties of variable length, for example with a minimum length of 90 mm or 100 mm or 110 mm, and/or with a maximum length of 220 mm or 200 mm or 180 mm. The length of the inner circumference of the loop defined by the closed jaws and the pivotable path portion may thus be adjusted for handling said lengths. The length adjustment mechanism may be configured to reduce the guidance path length from its maximum to a length below 80% or below 70% or below 60% of the maximum length.
(37) Features described in this specification shall be deemed combinable with each other also if their combination is not expressly mentioned, to the extent that this combination is technically feasible. Features described in a certain context, embodiment, figure or claim shall be deemed separable from this claim, context, figure or embodiment, to the extent that this is technically feasible, and shall be deemed combinable with other embodiments, contexts, figures or claims, to the extent that it is technically feasible. Descriptions of methods and method steps shall be deemed also as description of means for implementing the method or method step, and vice versa.
