CA2201704C - Improved stretcher in calenders for tubular knitted fabrics - Google Patents
Improved stretcher in calenders for tubular knitted fabricsInfo
- Publication number
- CA2201704C CA2201704C CA 2201704 CA2201704A CA2201704C CA 2201704 C CA2201704 C CA 2201704C CA 2201704 CA2201704 CA 2201704 CA 2201704 A CA2201704 A CA 2201704A CA 2201704 C CA2201704 C CA 2201704C
- Authority
- CA
- Canada
- Prior art keywords
- stretcher
- arms
- support rolls
- drive wheels
- support
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Treatment Of Fiber Materials (AREA)
Abstract
The invention relates to a stretcher for tubular knitted fabrics comprising two separate stretcher arms (5, 6) bearing pulleys (23) in contact with belts (22) for carrying fabric (4), driven by drive wheels (11A, 11B) borne by supports (8) suitable to horizontally move in opposite directions and bearing pairs of support rolls (19, 20) with angled axle (21), each pair (19, 20) supporting on the opposite sides a ring (17) which has a particular profile, is idle on each arm (5, 6) and is in contact with each drive wheel (11A, 11B), wherein the above-mentioned pairs of rolls (19, 20) are motor-driven.
Description
.
WO 96115303 - 2 2 0 1 7 0 ~ 17~
"IMPROV~n ST~T~ IN C~T~D~S FOR TUBU~
F~R~ICS"
Subject of the present invention is a stretcher for tubular knitted fabrics, in particular a stretcher to be applied in calenders or other machines for the treatment of tubular fabrics.
As it is known, during the finishing operations of tubular knitted fabrics, stretchers are used to spread out and stretch the tubular element in order to enhance the finishing operations. Thus in calendering, which usually is the last finishing operation, it is necessary to use a stretcher to achieve a uniform vaporization and to adjust the height of the tubular element to the desired value.
Known stretchers or expanders are provided with means placed between the stretcher arms, such as for example pantograph devices or telescopic tubes. These stretchers are provided in two or more sizes corresponding to the different heights of the tubular fabric. In these conditions there is the disadvantage that, in order to change a height range, it is necessary to replace the stretchers, so that the machine must be shut down for fitting the new stretcher in and the tubular fabric portions must be unstiched and restiched.
WO 96115303 - 2 2 0 1 7 0 ~ 17~
"IMPROV~n ST~T~ IN C~T~D~S FOR TUBU~
F~R~ICS"
Subject of the present invention is a stretcher for tubular knitted fabrics, in particular a stretcher to be applied in calenders or other machines for the treatment of tubular fabrics.
As it is known, during the finishing operations of tubular knitted fabrics, stretchers are used to spread out and stretch the tubular element in order to enhance the finishing operations. Thus in calendering, which usually is the last finishing operation, it is necessary to use a stretcher to achieve a uniform vaporization and to adjust the height of the tubular element to the desired value.
Known stretchers or expanders are provided with means placed between the stretcher arms, such as for example pantograph devices or telescopic tubes. These stretchers are provided in two or more sizes corresponding to the different heights of the tubular fabric. In these conditions there is the disadvantage that, in order to change a height range, it is necessary to replace the stretchers, so that the machine must be shut down for fitting the new stretcher in and the tubular fabric portions must be unstiched and restiched.
2 2 0 1 7 0 4 ~ /00178 The present invention is applied to stretchers of the prior art in order to improve them; in particular, reference is made to the European Patent N 0267880 in the name of the owner of the present invention. This patent relates to a stretcher for tubular knitted ~abrics comprising two stretcher arms horizontally moving in opposite directions, each arm provided with pulleys, whereby at least one of them is in contact with a drive wheel for carrying the tubular fabric and a support device integral with a support for the drive wheel which bears a shaped ring idle on each stretcher arm and in contact with the drive wheel, thus making said support integral with the stretcher arm.
Main object and technical problem of the present invention is to provide a stretcher in calenders for tubular knitted fabrics wherein the drive homogeneity of the carrying of the fabric, the centering of the stretcher arm and the adjustmerLt of the work-angles are improved, and the stretcher is sturdy enough to have a practically inflexible bar on which the arms run with a high drive easiness for the motion of the stretcher arms.
The features, the advantages and the solution of the above mentioned technical problem of the invention will become apparent from the following detailed
Main object and technical problem of the present invention is to provide a stretcher in calenders for tubular knitted fabrics wherein the drive homogeneity of the carrying of the fabric, the centering of the stretcher arm and the adjustmerLt of the work-angles are improved, and the stretcher is sturdy enough to have a practically inflexible bar on which the arms run with a high drive easiness for the motion of the stretcher arms.
The features, the advantages and the solution of the above mentioned technical problem of the invention will become apparent from the following detailed
3 .~ D178 description of a preferred but not exclusive embodiment of the present stretcher, shown for a merely illustrative and not limiting purpose in the attached drawings wherein:
FIGURE 1 is a front view of the stretcher, FIGURE 2 is an enlarged view of a partial horizontal section of the stretcher along line II-II of figure l, and FIGURE 3 is a view of a detail of the stretcher.
lO Referring to the figures, the aforesaid calender consists of stands l and 2 containing the calender control and drive mechanisms not shown in the figure.
These stands support the known vaporizer 3 wherein the tubular fabric 4 is introduced after having been passed through the stretcher according to the present invention.
Said stretcher consists of stretcher arms 5 and 6 which are supported by support devices described afterwards. A guide bar 7 fastened to stands l and 2 bears the two supports 8 relevant to each arm 5, 6 and supports 8 bear a bevel gear set 9 which is driven by a grooved bar lO and drives the upper drive wheels llA.
The sole guide bar 7, having an appropriate size, is useful for giving a better strength to the stretcher so that the bar is practically inflexible.
WO96115303 2 2 0 1 7 0 4 1~ s;~olJ~
Threaded bushings 12 and 13 are integral with supports 8, said bushings being engaged with opposite handed threads 14 and 15 respectively which are provided on actuating shaft 16. Bar 10 and shaft 16 are driven by known means contained in stands 1 and 2 and not shown in the figure. When shaft 16 rotates, the two opposite handed threads 14 and 15 move in opposite directions bushings 12 and 13, supports 8 and therefore stretcher arms 5 and 6.
Upper drive wheels llA are connected to the similar lower wheels llB by means not shown in the figure, such as ch~; n~, toothed belts or similar.
As it is clearly shown in figures 1 and 2, stretcher arms 5 and 6 bear idle rings 17, suitably shaped, which are in contact with the convex portion 11' of drive wheels llA and llB. These wheels bear mountings 18 which support the aforesaid support devices consisting of pairs of support rolls 19 and 20 with angled axle 21. Said rolls 19 and 20 support arms 5 and 6 by engaging their peripheral portion with the circular profile 17' of rings 17, thus aligning them in parallel. This parallel alignment is kept thanks to the sets of rolls 19 and 20 with angled axle which are two for each arm 5 and 6, whereby each set is engaged with drive wheels llA and llB and placed on both sides of actuating shaft 16. Tubular fabric 4 is carried by means of belts 22 wound on a line of pulleys 23 which are idle on arms 5 and 6, and along the shaped surfaces o~ drive wheels llA and llB and o~ rings 17.
According to the main ~eature of the present invention, as can be clearly seen in figures 2 and 3, both support rolls 19 are motor-driven because they are connected together by an elastic belt 24 which is wound on drive wheels llA and llB and on idle pulleys 25.
Similarly, support rolls 20 are motor-driven because they are connected to drive wheels llA and llB
by means of an elastic belt 24'.
Said motorization advantageously improves the carrying o~ the fabric. There~ore, the convexity 11~ o~
wheels 11A and llB carries out a better centering o~
arms 5 and 6 and improves the working-angles thereo~.
In particular, mountings 18 consist of ~ork brackets 26 for the adjustment o~ the working-angles o~
arms 5 and 6.
The velocity o~ the rolls 19l 20 must be carefully choosen having regard to the velocity of the driving wheel llA or llB on each support, so that the device works properly and the fabric does not break.
Operation is as follows: tubular fabric 4, which usually consists o~ several tubular pieces knitted together, is introduced from the bottom, as it is shown in figures 1 and 2, between rolls 19, 20 and ring 17 and between ring 17 and wheels llA and llB of each arm, so it is carried to the top in the direction of arrow A
~N~
. .
WO96tl5303 2 2 0 1 7 0 4 ~ /00l~8 by rotating drive wheels llA and llB engaged with rings 17 and pulleys 23 mounted on arms 5 and 6, which are kept in position and are supported by the aforesaid sets of rolls 19 and 20 with angled axle 21. In order to increase the tubular height, shaft 16 is rotated by drlving means not shown in the figure, so that threads 14 and 15 move arms 5 and 6 in the settled position, corresponding to the desired tubular height. The minimum height corresponds to the position of arms .5' and 6' shown with dotted lines in figure 1.
When a greater height of the tubular fabric is desired, shaft 16 is rotated in the opposite direction so that arms 5 and 6 move away from each other up to reach the m~mllm distance as shown with full lines in figure 1.
As it is apparent, the stretcher can take any position from a minimum to a maximum distance without changing the stretcher, i.e. without shutting the machine down and therefore without removing the tubular fabric from the stretcher.
Furthermore, as described above, thanks to this invention the carrying of the fabric, the centering of the stretcher arms, the adjustment of the working-angles and the strength of the stretcher are improved, the bar on which the arms run is practically inflexible . W096/15303 22 0 ~ 704 ~ ,00l78 and the stretcher is easy to control.
Practical or application-orlented variations can be made to the embodiment details of this invention without exceeding the scope thereof, as claimed below.
=7A~ 4
FIGURE 1 is a front view of the stretcher, FIGURE 2 is an enlarged view of a partial horizontal section of the stretcher along line II-II of figure l, and FIGURE 3 is a view of a detail of the stretcher.
lO Referring to the figures, the aforesaid calender consists of stands l and 2 containing the calender control and drive mechanisms not shown in the figure.
These stands support the known vaporizer 3 wherein the tubular fabric 4 is introduced after having been passed through the stretcher according to the present invention.
Said stretcher consists of stretcher arms 5 and 6 which are supported by support devices described afterwards. A guide bar 7 fastened to stands l and 2 bears the two supports 8 relevant to each arm 5, 6 and supports 8 bear a bevel gear set 9 which is driven by a grooved bar lO and drives the upper drive wheels llA.
The sole guide bar 7, having an appropriate size, is useful for giving a better strength to the stretcher so that the bar is practically inflexible.
WO96115303 2 2 0 1 7 0 4 1~ s;~olJ~
Threaded bushings 12 and 13 are integral with supports 8, said bushings being engaged with opposite handed threads 14 and 15 respectively which are provided on actuating shaft 16. Bar 10 and shaft 16 are driven by known means contained in stands 1 and 2 and not shown in the figure. When shaft 16 rotates, the two opposite handed threads 14 and 15 move in opposite directions bushings 12 and 13, supports 8 and therefore stretcher arms 5 and 6.
Upper drive wheels llA are connected to the similar lower wheels llB by means not shown in the figure, such as ch~; n~, toothed belts or similar.
As it is clearly shown in figures 1 and 2, stretcher arms 5 and 6 bear idle rings 17, suitably shaped, which are in contact with the convex portion 11' of drive wheels llA and llB. These wheels bear mountings 18 which support the aforesaid support devices consisting of pairs of support rolls 19 and 20 with angled axle 21. Said rolls 19 and 20 support arms 5 and 6 by engaging their peripheral portion with the circular profile 17' of rings 17, thus aligning them in parallel. This parallel alignment is kept thanks to the sets of rolls 19 and 20 with angled axle which are two for each arm 5 and 6, whereby each set is engaged with drive wheels llA and llB and placed on both sides of actuating shaft 16. Tubular fabric 4 is carried by means of belts 22 wound on a line of pulleys 23 which are idle on arms 5 and 6, and along the shaped surfaces o~ drive wheels llA and llB and o~ rings 17.
According to the main ~eature of the present invention, as can be clearly seen in figures 2 and 3, both support rolls 19 are motor-driven because they are connected together by an elastic belt 24 which is wound on drive wheels llA and llB and on idle pulleys 25.
Similarly, support rolls 20 are motor-driven because they are connected to drive wheels llA and llB
by means of an elastic belt 24'.
Said motorization advantageously improves the carrying o~ the fabric. There~ore, the convexity 11~ o~
wheels 11A and llB carries out a better centering o~
arms 5 and 6 and improves the working-angles thereo~.
In particular, mountings 18 consist of ~ork brackets 26 for the adjustment o~ the working-angles o~
arms 5 and 6.
The velocity o~ the rolls 19l 20 must be carefully choosen having regard to the velocity of the driving wheel llA or llB on each support, so that the device works properly and the fabric does not break.
Operation is as follows: tubular fabric 4, which usually consists o~ several tubular pieces knitted together, is introduced from the bottom, as it is shown in figures 1 and 2, between rolls 19, 20 and ring 17 and between ring 17 and wheels llA and llB of each arm, so it is carried to the top in the direction of arrow A
~N~
. .
WO96tl5303 2 2 0 1 7 0 4 ~ /00l~8 by rotating drive wheels llA and llB engaged with rings 17 and pulleys 23 mounted on arms 5 and 6, which are kept in position and are supported by the aforesaid sets of rolls 19 and 20 with angled axle 21. In order to increase the tubular height, shaft 16 is rotated by drlving means not shown in the figure, so that threads 14 and 15 move arms 5 and 6 in the settled position, corresponding to the desired tubular height. The minimum height corresponds to the position of arms .5' and 6' shown with dotted lines in figure 1.
When a greater height of the tubular fabric is desired, shaft 16 is rotated in the opposite direction so that arms 5 and 6 move away from each other up to reach the m~mllm distance as shown with full lines in figure 1.
As it is apparent, the stretcher can take any position from a minimum to a maximum distance without changing the stretcher, i.e. without shutting the machine down and therefore without removing the tubular fabric from the stretcher.
Furthermore, as described above, thanks to this invention the carrying of the fabric, the centering of the stretcher arms, the adjustment of the working-angles and the strength of the stretcher are improved, the bar on which the arms run is practically inflexible . W096/15303 22 0 ~ 704 ~ ,00l78 and the stretcher is easy to control.
Practical or application-orlented variations can be made to the embodiment details of this invention without exceeding the scope thereof, as claimed below.
=7A~ 4
Claims (6)
1. Stretcher in calender for tubular knitted fabrics comprising: two stretcher arms (5, 6) substantially vertical and horizontally moving in opposite directions, each arm provided with pulleys (23) connected to a belt (22) for carrying the tubular fabric (4) and two support devices, each support device comprising a pair of support rolls (19, 20);
a shaped ring (17) idle on each stretcher arm (5, 6) and in contact with a rotating drive wheel (11A, 11B), the circumferential shaped external surfaces of the support rolls (19, 20) with angled axle (21) engaging with the surfaces of the shaped ring (17), the tubular fabric being carried between said circumferential shaped surfaces of said support rolls (19, 20) and the shaped surfaces of said shaped rings (17), characterized in that the support rolls (19, 20) are driven through own driving means.
a shaped ring (17) idle on each stretcher arm (5, 6) and in contact with a rotating drive wheel (11A, 11B), the circumferential shaped external surfaces of the support rolls (19, 20) with angled axle (21) engaging with the surfaces of the shaped ring (17), the tubular fabric being carried between said circumferential shaped surfaces of said support rolls (19, 20) and the shaped surfaces of said shaped rings (17), characterized in that the support rolls (19, 20) are driven through own driving means.
2. Stretcher according to claim 1, characterized in that an elastic drive belt (24) connects said support rolls (19) to the drive wheels (11A, 11B) for rotating them, and a second elastic drive belt (24') connects said support rolls (20) to said drive wheels (11A, 11B).
3. Stretcher according to claim 1 and 2, characterized in that the drive wheels (11A, 11B) have a convex peripheral surface, both in contact with the concave external surface of the shaped ring (17).
4. Stretcher according to the preceding claims, characterized in that the support rolls (19, 20) are borne by mountings (18) consisting of fork brackets (26) for the adjustment of the working-angles of the arms (5 and 6).
5. Stretcher according to the preceding claims, characterized in that a sole crossbar (7) bears the two stretcher arms (5, 6) which are suitable to move along said crossbar (7).
6. Stretcher according to the preceding claims, characterized in that the two support devices (19, 20) are placed on both sides of an actuating shaft (16) which moves the two stretcher arms (5, 6), and that the drive wheels (11A, 11B) are mechanically connected together, whereby only the drive wheels (11A) are driven by a single rotating grooved bar (10) .
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI942261A IT1271712B (en) | 1994-11-09 | 1994-11-09 | IMPROVED ENLARGER IN CALENDERS FOR TUBULAR MESH FABRICS |
| ITMI94A002261 | 1994-11-09 | ||
| PCT/IT1995/000178 WO1996015303A1 (en) | 1994-11-09 | 1995-11-07 | Improved stretcher in calenders for tubular knitted fabrics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2201704A1 CA2201704A1 (en) | 1996-05-23 |
| CA2201704C true CA2201704C (en) | 1999-08-24 |
Family
ID=29422240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2201704 Expired - Fee Related CA2201704C (en) | 1994-11-09 | 1995-11-07 | Improved stretcher in calenders for tubular knitted fabrics |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2201704C (en) |
-
1995
- 1995-11-07 CA CA 2201704 patent/CA2201704C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2201704A1 (en) | 1996-05-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |