Teaseling and/or fluffing machine for fabric and knit-work with tension control

Abstract: A teaseling and/or fluffing machine for fabric and knitwork with tension control, comprising a load-bearing structure with two sidepieces (10) supporting at least one drum (11) which rotates about a central shaft (12) and supports on its two lateral endpieces (11a, 11b) two series of teaseling and/or fluffing rollers of with-pile type (13) and against-pile type (14) arranged along the generators of the drum (11) with those of one series rotating relative to those of the other under independent drive, a fabric (15) to be treated passing about the teaseling and/or fluffing rollers (13, 14) and being fed to the machine by a driven feed roller (16) and extracted therefrom by a driven exit roller (17), there being provided brushes (19a, 20a; 19b, 20b) which interact alternately with the teaseling and/or fluffing rollers (13, 14), between the feed roller (16) and the drum (11) and, respectively, between the exit roller (17) and the drum (11) there being interposed two further rollers (16b, 17b) the shafts (16a, 17a) of which are rotatably supported on automatic tension control devices (24a, 24b) fixed to the load-bearing structure (10) and controlling respective motors (31) of the feed roller (16) and exit roller (17), in order to automatically control and regulate the fabric tension, both at its entry and at its exit.

Description: This invention relates to a teaseling and/or fluffing machine for fabric and knitwork with tension control. Known teaseling and/or fluffing machines are composed essentially of one or more drums rotating with predetermined direction and speed, along their circumference there being housed a certain number of teaseling and/or fluffing rollers. If the rollers are teaseling rollers they are embraced by cloth carrying the needles alternately in the same direction as the fabric (with the pile) and in the opposite direction (against the pile), they rotating about themselves under independent control. The same applies to fluffing rollers, which carry an abrasive paper covering instead of cloth carrying needles. These rollers also rotate with predeterminable speed and direction. The fabric to be teaseled and/or fluffed wraps a considerable part of the drum circumference and part of the teaseling and/or fluffing rollers, it being fed via an entry roller and extracted from the drum via an exit roller. These entry and exit rollers also rotate at predetermined speed, depending on the working or advancement speed of the fabric. The speed of the two rollers can be different and predetermined in relation to the desired fabric tension. EP-A-224 683 (upon which the preamble of claim 1 is based) relates to a teaseling machine in which a fabric tension control device is provided. This device comprises dancing rolls and there is not a direct detection of the tension of the fabric on the drum. EP-A-534 151 discloses a generical machine for fabric treatment in which is used a load cell for regulating the tension of a fabric onto a roll which controls the speed of the motor of a calender. A constant fabric tension results in a constant teaseling and/or fluffing effect. If the physical conditions of the fabric change, for example it becomes more or less dry or its selvedges vary, then its tension changes, and in order to be able to respond to modern requirements the plant has to be provided with automatic systems which ensure a constant predetermined tension. The object of the present invention is to solve the aforesaid problems. This object is attained according to the present invention by a teaseling and/or fluffing machine according to claim 1. The characteristics and advantages of a teaseling and/or fluffing machine according to the present invention will be more apparent from the ensuing description given by way of non-limiting example with reference to the accompanying schematic drawings, in which: Figure 1 is a cross-section through the teaseling and/or fluffing machine according to the present invention taken on the line I-I of Figure 2; Figure 2 is a section on the line III-III of Figure 1; and Figure 3 is an enlarged view of a further feed and/or exit roller provided with fabric tension balancing cells. The figures show a teaseling and/or fluffing machine for fabric and knitwork according to the present invention. The teaseling and/or fluffing machine comprises essentially a load-bearing and containing structure consisting generally of two sidepieces 10, on which there is supported a drum 11 rotating about a central motorized shaft 12. The endpieces 11a, 11b of the drum 11 support two series of teaseling and/or fluffing rollers, respectively with the pile 13 and against the pile 14, arranged along generators of the drum 11. In addition the rollers 13 and 14 for example alternate individually with each other and rotate with independent drive and direction one to the other. A fabric 15 to be treated passes partially about the drum 11 and over the teaseling and/or fluffing rollers 13 and 14 and is fed by a feed roller 16, but before passing onto the drum and over the teaseling and/or fluffing rollers 13 and 14 to be extracted by an exit roller 17 it passes about and is controlled by further rollers 16b and 17b. The feed roller 16 and exit roller 17 are located in proximity to two groups of teaseling and/or fluffing roller cleaning brushes indicated by 19a, 20a and 19b, 20b. Both the brush groups are made alternately and selectively active, the first group always on the with-pile teaseling and/or fluffing rollers 13 and the second group always on the against-pile teaseling and/or fluffing rollers 14, via elements which cause them to engage the relative rollers. It should be noted that the shafts 16a and 17a of the tension control rollers 16b and 17b according to the present invention are rotatably arranged on automatic tension control devices, such as electronic load cells indicated schematically at 24a and 24b in Figure 3. The load cells 24a and 24b are positioned in proximity to the two ends of the shafts 16a and 17a and fixed to the sidepieces 10 of the load-bearing structure to control the two respective motors 31 rotating the fed roller 16 and exit roller 17 in order to automatically regulate the tension of the fabric both at its entry to and at its exit from the drum. If operating on fabric obtained from double height looms which when cut in half have different-tension or different-length selvedges, the double load cell enables the tensions to be properly adjusted. This arrangement, shown for the roller 16b in Figure 3 but also valid for the roller 17b, is automatically controlled for example by a motor 25 interacting with the cells 24a and 24b, and achieves a balancing of the load on the two cells enabling the tension in the fabric 15 to be equalized over its entire height, even if different selvedges are present. In this respect, the fabric tension causes the shaft 16a or 17a to act on the supports 26 of the roller 16b or 17b, these interacting with the load cells 24a and 24b to control the motor 25. Hence a teaseling and/or fluffing machine according to the invention has the following considerable advantages: automatic fabric tension adjustment both at the entry to and exit from the drum, achieved by automatic tension control devices such as electronic load cells; and selvedge tension balancing achieved by the combined action of tension control devices such as load cells, which by misaligning or inclining the axis of one roller render the effects constant and homogeneous.

Claims: A teaseling and/or fluffing machine for fabric and knitwork with tension control, comprising essentially a load-bearing structure consisting of two sidepieces (10) supporting at least one drum (11) which rotates about a central shaft (12) and supports on its two lateral endpieces (11a, 11b) two series of teaseling and/or fluffing rollers of with-pile type (13) and against-pile type (14), these being arranged along the generators of said drum (11) with those of one series rotating relative to those of the other under independent drive, a fabric (15) to be treated passing about said teaseling and/or fluffing rollers (13, 14) and being fed to the machine by a driven feed roller (16) and extracted therefrom by a driven exit roller (17), there also being provided brushes (19a, 20a; 19b, 20b) which interact alternately with said teaseling and/or fluffing rollers (13, 14), characterised in that between said feed roller (16) and said drum (11) and, respectively, between said exit roller (17) and said drum (11) there are interposed two further rollers (16b, 17b) the shafts (16a, 17a) of which are rotatably suppurted on automatic tension control devices (24a, 24b) fixed to said load-bearing structure (10) and controlling respective motors (31) of said feed roller (16) and exit roller (17), in order to automatically control and regulate the fabric tension, both at its entry and at its exit, in that said automatic tension control devices consist of electronic load cells (24a, 24b) and in that said shafts (16a, 17a) have their axes inclinable by a motor means (25) which is automatically controlled by said load cells (24a, 24b) each time the load on these latter is found to be unbalanced, hence equalizing the selvedge tension. A teaseling and/or fluffing machine as claimed in claim 1, characterised in that said shafts (16a, 17a), are arranged on supports (26) positioned on said load cells (24a, 24b) provided with said motor means (25). A teaseling and/or fluffing machine as claimed in claim 1, characterised in that at least one of said two side pieces (10) provides slots where said shafts (16a, 17a) are slidably supported, said slots and said load cells (24a, 24b) being provided in a horizontal direction.

Inventors: DALLA VECCHIA GINO, DALLA VECCHIA, GINO
Applicants: SPEROTTO RIMAR SPA, SPEROTTO RIMAR S.P.A.
Application year: 1993
Main classification: D06C11
IPC codes: B65H23, D06C11