US20140208696A1 - Film Tension Apparatus And Supply Roll Support For Stretch Wrapping Machines - Google Patents
Film Tension Apparatus And Supply Roll Support For Stretch Wrapping Machines Download PDFInfo
- Publication number
- US20140208696A1 US20140208696A1 US14/163,471 US201414163471A US2014208696A1 US 20140208696 A1 US20140208696 A1 US 20140208696A1 US 201414163471 A US201414163471 A US 201414163471A US 2014208696 A1 US2014208696 A1 US 2014208696A1
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- United States
- Prior art keywords
- brake
- roller
- film
- braking surface
- braking
- 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.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B11/00—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material
- B65B11/04—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated
- B65B11/045—Wrapping, e.g. partially or wholly enclosing, articles or quantities of material, in strips, sheets or blanks, of flexible material the articles being rotated by rotating platforms supporting the articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B41/00—Supplying or feeding container-forming sheets or wrapping material
- B65B41/12—Feeding webs from rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/06—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle
- B65H23/08—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle acting on web roll being unwound
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2555/00—Actuating means
- B65H2555/10—Actuating means linear
- B65H2555/13—Actuating means linear magnetic, e.g. induction motors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/81—Packaging machines
Definitions
- the present invention relates generally to stretch wrapping loads and, more particularly, to improved methods and apparatus for applying film tension and supporting a film supply roll in stretch wrapping machines.
- Various packaging techniques have been used to assemble a load of unit products and subsequently wrap them for transportation, storage, containment and stabilization, protection and waterproofing.
- Products are often stacked as a load on a pallet to simplify handling of the products.
- the pallet load is commonly wrapped with stretch wrap packaging material.
- One system uses stretch wrapping machines to stretch, dispense, and wrap stretch packaging material around a load.
- Stretch wrapping can be performed as an inline, automated packaging technique that dispenses and wraps packaging material in a stretched condition around a load on a pallet to cover and contain the load.
- Pallet stretch wrapping whether accomplished by a turntable, a rotating arm, or by a vertically movable rotating ring, typically covers the vertical sides of the load with a stretchable film, such as polyethylene film. In each of these arrangements, relative rotation is provided between the load and the packaging material dispenser to wrap packaging material around the sides of the load.
- pre-stretching of the film is accomplished by first and second pre-stretch rollers that rotate at different speeds so that film material passing between the two rollers is stretched prior to application to a load.
- pre-stretching of the film may be accomplished by applying braking forces to a film web extending between a supply roll and the load.
- the present invention overcomes the foregoing and other shortcomings and drawbacks of apparatus and methods heretofore known for use in stretch wrapping loads. While the invention will be described in connection with certain embodiments, it will be understood that the invention is not limited to these embodiments. On the contrary, the invention includes all alternatives, modifications and equivalents as may be included within the spirit and scope of the present invention.
- a film dispenser for stretch wrapping machines includes at least one roller and a first brake engageable with a braking surface the one roller.
- the first brake is adjustable between a first configuration engaged with the braking surface and applying a first braking force to the braking surface, and a second configuration disengaged from the braking surface or only minimally engaged with the braking surface such that any braking force applied is substantially less than the first braking force.
- the first brake may be an electrically-actuated brake.
- the first brake may include a flat brake pad that is pivotally movable about a pivot axis spaced from the roller such that the brake pad is movable into engagement with the braking surface generally along a radial direction of the roller.
- a supply roll support for a film dispenser includes an elongate post sized to receive a roll of film thereon, and a pliable sheet coupled with the outer peripheral surface of the post and extending around at least a portion of the outer peripheral surface. At least a portion of the pliable sheet is spaced radially outwardly from the outer peripheral surface for engagement with the inner diameter of a supply roll supported on the post.
- FIG. 1 is a perspective view of an exemplary stretch wrapping machine in accordance with the principles of the present invention.
- FIG. 2 is an exploded perspective view of an exemplary dispenser of the stretch wrapping machine of FIG. 1 , illustrating an exemplary brake assembly and an exemplary film roll post in accordance with the principles of the present invention.
- FIG. 3 is a perspective view of an exemplary brake assembly of the dispenser of FIG. 2 .
- FIG. 4A is a cross-sectional view of the brake assembly of FIG. 3 , taken along line 4 A- 4 A.
- FIG. 4B is a cross-sectional view of the brake assembly, similar to FIG. 4A , illustrating operation of the brake assembly with increased preload.
- FIG. 4C is a cross-sectional view of the brake assembly, similar to FIG. 4A , illustrating disengagement of the brake pad.
- FIG. 5 is a partial top view of the brake assembly of FIG. 4C , taken along line 5 - 5 .
- FIG. 6A is a schematic illustration of the dispenser of FIG. 2 , illustrating an exemplary path of film material through the dispenser.
- FIG. 6B is a schematic illustration similar to FIG. 6A , illustrating an alternative film path through the dispenser.
- FIG. 7 is a perspective view of a second exemplary brake assembly in accordance with the principles of the present invention.
- FIG. 8 is a top plan view of the brake assembly of FIG. 7 .
- FIG. 9 depicts a perspective view of a third exemplary brake assembly in accordance with the principles of the present invention.
- FIG. 10A is a side elevation view of the brake assembly of FIG. 9 .
- FIG. 10B is a side elevation view similar to FIG. 10A , depicting the brake assembly of FIG. 9 in an engaged condition.
- FIG. 11 is a perspective view of a fourth exemplary brake assembly in accordance with the principles of the present invention.
- FIG. 12A is a side elevation view of the brake assembly of FIG. 11 .
- FIG. 12B is a side elevation view similar to FIG. 12A , depicting the brake assembly of FIG. 11 in an engaged condition.
- FIG. 13 is an enlarged detail view of the bottom of the tension roller of the brake assembly of FIG. 11 .
- FIG. 1 depicts an exemplary stretch wrapping machine 10 including a film dispenser 12 for applying pre-stretched film material 14 to a load 16 from a supply roll 18 .
- the dispenser 12 is coupled to a vertically extending mast 20 .
- the dispenser 12 moves up and down the mast 20 while paying out film material 14 so that the film material 14 is spirally wrapped around the load 16 .
- the stretch wrapping machine 10 further includes a load support 22 having a turntable 24 for rotating the load 16 supported thereon relative to the dispenser 12 during wrapping of the load 16 .
- FIG. 2 is an exploded perspective view of the exemplary film dispenser 12 of FIG. 1 .
- the film dispenser 12 includes a bottom plate 30 supporting the components of the dispenser 12 , and a supply roll post 32 coupled with the bottom plate 30 .
- the dispenser 12 further includes first and second guide rollers 34 , 36 supported in journal bearings 38 coupled between the bottom plate 30 and a top plate 40 spaced from the bottom plate 30 .
- the dispenser 12 further includes a brake assembly 42 supported on the top plate 40 and enclosed by a removable cover 44 .
- a tension roller 46 extends between the bottom plate 30 and a bearing plate 48 secured to the top plate 40 .
- the tension roller 46 includes a circumferentially extending film engaging surface 50 that contacts film material 14 dispensed from the supply roll 18 , and a circumferential braking surface 52 (see FIG. 4A ).
- FIGS. 6A and 6B illustrate two exemplary paths for threading film material 14 through the dispenser 12 for application to a load 16 .
- the supply roll 18 has been placed over the support post 32 such that film material 14 is dispensed by rotation of the supply roll 18 in a clockwise direction about the support post 32 .
- FIG. 6A the supply roll 18 has been placed over the support post 32 such that film material 14 is dispensed by rotation of the supply roll 18 in a clockwise direction about the support post 32 .
- the supply roll 18 has been placed over the support post 32 such that film material 14 is dispensed from the supply roll 18 during counterclockwise rotation of the supply roll 18 about the support post 32 .
- the tension roller 46 may be coated with a friction material 54 (see FIG. 4A ) in the region of the film engaging surface 50 to increase friction between the tension roller 46 and the film material 14 , or to prevent slipping of the film material 14 circumferentially around the tension roller 46 .
- the brake assembly 42 includes first brake 60 having a brake pad 62 adjustably supported for engagement with the braking surface 52 of the tension roller 46 , whereby the brake pad 62 is selectively adjustable between a first configuration engaged with the braking surface 52 such that the brake pad 62 applies a first braking force to the tension roller 46 , and a second configuration disengaged from the braking surface 52 , or only minimally engaging the braking surface 52 such that a braking force in the second configuration is substantially less than the first braking force.
- the substantially less braking force caused by the brake pad 62 in the second configuration may only be sufficient to prevent free rolling of the tension roller 46 , but in no way adversely affects normal operation of the tension roller 46 .
- the brake pad 62 has a generally flat contact surface 64 and is supported on a brake plate 66 for movement toward and away from the braking surface 52 of the tension roller 46 generally along a radial direction of the tension roller 46 .
- the brake plate 66 is pivotally coupled between the bearing plate 48 and the top plate 40 at a distance spaced from the tension roller 46 such that the brake pad 62 is constrained for movement toward and away from the braking surface 52 of the tension roller 46 generally along a radial direction of the tension roller 46 .
- the brake plate 66 may be pivotally coupled between the top plate 40 and the bearing plate 48 by a pin connection.
- the brake plate 66 may be formed with tabs configured to be received in complementary structure on the top plate 40 and bearing plate 48 to provide a hinge joint. While the brake assembly 42 has been shown and described herein as having a brake plate 66 pivotally coupled proximate the tension roller 46 to constrain the brake pad 62 for movement toward and away from the braking surface 52 along a generally radial direction, it will be appreciated that various other structure and methods for constraining movement of the brake pad 62 along a generally radial direction may alternatively be used.
- the brake assembly 42 further includes a spring 70 biasing the brake plate 66 and brake pad 62 in a direction toward the braking surface 52 of the tension roller 46 .
- the spring 70 is mounted on a shaft 72 extending generally radially from the braking surface 52 .
- the shaft 72 is coupled with the bearing plate 48 by a journal 74 for rotation of the shaft 72 about its longitudinal axis.
- a length of the shaft includes screw threads 76 , and the shaft 72 supports a pressure block 78 having a tapped aperture 80 for receiving the threads 76 of the shaft 72 such that when the shaft 72 is rotated the pressure block 78 may be moved axially along the shaft 72 to increase or decrease a preload of the spring 70 and thereby vary a biasing force of the spring 70 against the brake plate 66 and brake pad 62 .
- a knob 82 or other control surface may be provided on an end of the shaft 72 opposite the threaded portion, to facilitate rotating the shaft 72 to vary the preload of the spring 70 .
- FIG. 4B depicts brake assembly 42 in a condition wherein the preload applied by spring 70 has been increased relative to the preload depicted in FIG. 4A by rotating knob 82 .
- the brake assembly 42 may further include an indicator 90 that provides a visual indication of the amount of preload selected by manually manipulating the knob 82 , as depicted in FIGS. 2 , 3 , and 5 .
- the indicator 90 includes an indicator arm 92 pivotally coupled to the pressure block 78 for movement with the pressure block 78 as the shaft knob 82 is manipulated to increase or decrease preload of the spring 70 .
- a first end 92 a of the indicator arm 92 extends through an aperture 94 in the top plate 40 , and a second end 92 b of the indicator arm 92 is visible through a slot 96 in the cover 44 when the cover 44 is secured to the dispenser 12 .
- the cover 44 may include graduations or other visual features adjacent the slot 96 so that the position of the second end 92 b of the indicator arm 92 viewed through the slot 96 may give a visual indication of the amount of preload applied by the spring 70 .
- the brake assembly 42 may further include a release mechanism 100 that enables a user to move the brake pad 62 from the first configuration engaged with the braking surface 52 , to the second configuration disengaged from the braking surface 52 (or only minimally engaging the braking surface 52 ), as depicted generally in FIG. 4C .
- the release mechanism 100 includes a lever arm 102 pivotally coupled to the top plate 40 , such as by a pivot pin 104 .
- a cam roller 106 is mounted to the lever arm 102 for engagement with a cam surface 108 of a cam bracket 110 extending upwardly from the pressure block 78 .
- a distal end of the lever arm 102 opposite the pivot pin 104 , includes a handle portion 112 whereby a user may apply force to the handle portion 112 to engage the cam surface 108 of the cam bracket 110 with the cam roller 106 during movement of the lever arm 102 from a first position depicted in FIGS. 4A and 4B , in a direction toward top plate 40 to a second position depicted in FIG. 4C .
- the pressure block 78 and shaft 72 are forced away from the tension roller 46 , thereby removing the bias of the spring 70 against the brake plate 66 such that the brake pad 62 can move to the second configuration away from the braking surface 52 .
- the brake pad 62 either does not engage the braking surface 52 , or only applies minimal force to the braking surface 52 as described above.
- movement of the lever arm 102 is limited by engagement between a transverse stop member 114 and a vertically extending standoff 116 .
- the distal end 166 a of standoff 116 is threaded to receive a nut 118 for securing the cover 44 over the brake assembly 42 , as depicted in FIGS. 4A-4C .
- the brake assembly 42 may further include a second brake that also engages the circumferential braking surface 52 of the tension roller 46 .
- the second brake comprises a flexible band 120 engaging at least a portion of the circumferential braking surface 52 .
- One end 120 a of the band 120 is secured to a leg 122 of the bearing plate 48 , although it will be appreciated that the band 120 may be secured to any other suitable structure.
- a second end 120 b of the band 120 is secured to a post 124 coupled with the top plate 40 of the dispenser 12 .
- the second end 120 b of the band 120 is secured to the post 124 by a spring member 126 , whereby the band 120 is biased by the spring member 126 into engagement with the circumferential braking surface 52 of the tension roller 46 .
- the tension of the band 120 against the circumferential braking surface 52 may be selectively adjusted by adjusting the tension in the spring member 126 .
- the second brake applies a braking force against the circumferential braking surface 52 that is substantially less than the braking force of the first brake.
- the braking force of the second brake is selected to prevent free rolling of the tension roller 46 while otherwise allowing the tension roller 46 to be rotated during threading of film 14 through the dispenser 12 .
- the braking force of the second brake may be selected to provide a minimum resistance to rotation of tension roller 46 that will not cause film 14 to be pulled out of clamp structure that initially secures the film 14 to the load 16 when wrapping of the load 16 with the film 14 is started.
- the second brake therefore prevents free rolling of the tension roller 46 when the first brake is in the second configuration and disengaged, or substantially less engaged, than the first configuration.
- a flat brake pad 132 is supported on a brake arm 134 for pivotal movement with the brake arm 134 about a pivot axis 136 spaced from the tension roller 46 such that the brake pad 132 is movable into and out of engagement with the circumferential braking surface 52 of the tension roller 46 , generally along a radial direction of the tension roller 46 .
- a first end 134 a of the brake arm 134 is supported for pivotal movement about the pivot axis 136 by a tie rod 138 .
- the tie rod 138 extends from a support block 141 coupled to the top plate 40 a of the dispenser 12 a , and is operatively coupled to a first end 134 a of the brake arm 134 . Accordingly, the pivot axis 136 is generally located at the intersection of the brake arm 134 and the tie rod 138 .
- the brake assembly 130 further includes a solenoid actuator 140 operatively coupled to a second end 134 b of the brake arm 134 , at a location spaced from the pivot axis 136 and the brake pad 132 .
- the solenoid actuator 140 is coupled to the top plate 40 a of the dispenser 12 a by an L-shaped bracket 142 .
- the output shaft, or armature, 144 of the solenoid 140 is secured to the second end 134 b of the brake arm 134 by a coupling member 146 .
- the solenoid 140 is actuated to retract the armature 144 , the brake arm 134 is moved about the pivot axis 136 such that the brake pad 132 is moved into engagement with the braking surface 52 of the tension roller 46 .
- the solenoid 140 is spaced a distance from the pivot axis 136 , braking force applied by the brake pad 132 to the braking surface of the tension roller 46 is increased by leverage of the brake arm 134 about the pivot axis 136 .
- solenoids would not be suitable for use in braking a tension roller in a stretch wrapping operation because it was believed that a sufficient amount of force could not be developed over the relatively short stroke of the armature.
- the mechanical advantage provided by the increased leverage of the brake arm 134 about pivot axis 136 enables the solenoid actuator 140 to cause brake pad 132 to engage the braking surface 52 with sufficient force to enable control of the tension roller 46 as described herein.
- the solenoid actuator 140 may be actuated to a first condition wherein the brake pad 132 engages the braking surface 52 with a first braking force that slows rotation of the tension roller 46 to stretch the film material 14 during wrapping of a load 16 .
- the actuator 140 may also be actuated to a second condition wherein the brake pad 132 engages the braking surface 52 with a second braking force that is less than the first braking force, and which prevents free rolling of the tension roller 46 while still allowing the tension roller 42 to rotate when tension is applied to the film web 14 , to facilitate threading film 14 through the dispenser 12 a .
- the second braking force may be selected to provide a minimum resistance to rotation of tension roller 46 that will not cause film 14 to be pulled out of clamp structure that initially secures the film 14 to the load 16 when wrapping of the load 16 with the film 14 is started.
- the actuator 140 may also be actuatable to a third condition wherein the brake pad 132 engages the braking surface 52 of the tension roller 46 with a third braking force that locks the tension roller 46 against rotation.
- the third condition of the actuator 140 may be useful to facilitate intentional tearing or breaking the film 14 after a load 16 has been wrapped.
- the actuator 140 may also be actuatable to a fourth condition wherein the brake pad 132 is either disengaged from the braking surface 52 , or the brake pad 132 only engages the braking surface 52 with a negligible force.
- Actuator 140 may be remotely adjustable to vary the braking force applied to the braking surface 52 for the various operating conditions of the actuator 140 while the stretch wrapping machine 10 is in use.
- the actuator 140 may also be programmable to establish multiple settings of the actuator 140 corresponding to the various operating conditions. While the brake assembly 130 has been shown and described as including a solenoid actuator 140 for applying braking force to the tension roller 46 using a brake arm 134 , it will be appreciated that various other actuators may alternatively be used to apply braking force to the tension roller 46 .
- such actuators may include linear or rotary actuators, magnetic, electronic, hydraulic, or pneumatic devices, or any other device suitable for applying force to move the brake arm 134 to bring the brake pad 132 into and out of engagement with the braking surface 52 of the tension roller 46 .
- the brake pads engage only a portion of an area of the circumferential braking surface 52 .
- the area can be represented in part by an arc that is defined by swinging a radius from the rotational axis of tension roller 46 through an acute angle.
- the support post 32 is mounted to the dispenser 12 and is fixed against rotation about its longitudinal axis.
- the outer peripheral surface 150 of the post 32 is sized to be received within the inner diameter of a supply roll 18 mounted thereon.
- a first end 32 a of the post 32 is secured to the bottom plate 30 of the film dispenser 12 , and a thrust washer 152 and bushing 154 are provided thereon for engaging the core of a roll 18 of film material 14 placed over the post 32 .
- the bushing 154 and thrust washer 152 facilitate rotation of the supply roll 18 around the post 32 as film material 14 is drawn from the supply roll 18 for application to a load 16 during wrapping.
- a selectively removable top cap 156 may be provided at the second end 32 b of the post 32 to constrain the supply roll 18 thereon.
- the post 32 further includes a sheet of pliable material 160 coupled with the outer peripheral surface 150 of the post 32 and extending generally circumferentially around at least a portion of the outer peripheral surface 150 of the post 32 . At least a portion of the pliable sheet material 160 is secured to the circumferential surface 150 of the post 32 , such as with fasteners 162 , at a location generally opposite the tension roller 46 in the dispenser 12 .
- the length of the pliable sheet 160 is selected such that a portion of the pliable sheet 160 generally opposite the fasteners 162 is bowed to extend outwardly away from the outer peripheral surface 150 of the post 32 , and in a direction generally toward the tension roller 46 .
- the outwardly bowed pliable material 160 biases the roll 18 of film material 14 in a direction toward the tension roller 46 , as generally depicted in FIGS. 6A and 6B .
- the pliable sheet 160 is configured on the post 32 such that the pliable sheet 160 remains in engagement with the various sizes of cores 164 provided on supply rolls 18 used with the film dispenser 12 , and applies a friction force to the cores sufficient to prevent the supply rolls 18 from freely rotating on the post 32 . It has also been found that the pliable sheet 160 reduces or eliminates force variations in the film web 14 that would otherwise be present due to oscillating displacement of the film rolls 18 about the post 32 .
- a tube of pliable material may alternatively be secured to post 32 in a manner similar to the pliable sheet 160 , such that a portion of such tube extends outwardly from the post 32 to bias the film roll 18 in a direction toward tension roller 46 .
- FIGS. 2-8 include braking surfaces defined on circumferentially extending portions of a tension roller proximate the circumferential film engaging surface 50 , and include brake pads that move generally along radial directions relative to a rotational axis of the tension roller, it will be appreciated that other embodiments in accordance with the principles of the present invention may include various other types of braking surfaces, and may have brake pads that move into engagement with braking surfaces other than along radial directions, as may be desired.
- the brake assembly 170 includes a brake disk 172 coupled with a distal end of the tension roller 46 such that the rotational axis 174 of the disk 172 corresponds with the rotational axis of the tension roller 46 .
- a braking surface 176 is defined on a circumferentially extending portion of the disk 172 , whereby the braking surface 176 extends circumferentially around the tension roller 46 relative to the circumferential film engaging surface 50 .
- the brake assembly 170 further includes a brake pad 178 supported on a first end 180 a of a brake arm 180 for pivotal movement with the brake arm 180 about a pivot axis 182 spaced from the tension roller 46 such that the brake pad 178 is movable into and out of engagement with the braking surface 176 on disk 172 , generally along a direction that is substantially parallel to the rotational axis 174 of the brake disk 172 .
- the first end 180 a of the brake arm 180 is supported for pivotal movement about the pivot axis 182 by a shaft 184 , wherein the pivot 182 axis is substantially perpendicular to the rotational axis 174 of the disk 172 .
- the shaft 184 is supported by a pair of spaced apart journal brackets 186 coupled with the top plate 40 of the dispenser 12 b. It will be appreciated, however that brake arm 180 may alternatively be supported by various other structure for pivotal movement about a pivot axis such that the brake pad 178 is movable into and out of engagement with the braking surface 176 on disk 172 .
- brake pad 178 may alternatively be supported on an actuator for movement into and out of engagement with the braking surface 176 , without being mounted on a brake arm 180 .
- brake pad 178 may be mounted on the armature of a solenoid actuator such that actuation of the armature in directions toward or away from the brake disk 172 moves the brake pad 178 into and out of engagement with the braking surface 176 on brake disk 172 .
- the brake pad 178 has a generally flat surface for engaging the braking surface 176 , but it will be appreciated that the brake pad 178 may alternatively have various other configurations suitable for engagement with the braking surface 176 .
- the brake assembly 170 may further include brake force reaction assembly 190 located adjacent the brake disk 172 and generally opposite the brake pad 178 to support the disk 172 when braking forces are applied to the braking surface 176 by the brake pad 178 .
- the brake force reaction assembly 190 includes a rolling element 192 positioned beneath the brake disk 172 opposite the brake pad 178 . When braking forces are applied to the braking surface 176 of the disk 172 by engagement of the disk 172 with the brake pad 178 , the rolling element 192 limits deflection of the brake disk 172 under the action of braking forces.
- the brake assembly 170 may be configured such that the brake disk 172 engages and rides on rolling element 192 of the brake force reaction assembly 190 when tension roller 46 is rotating during operation of the film dispenser 12 b. Accordingly, any geometrical irregularities of tension roller 46 with respect to other components of film dispenser 12 b, such as misalignment or out-of-round conditions of the tension roller 46 , may be accommodated by the brake disk 172 being supported on rolling element 192 .
- the brake assembly 170 further includes a solenoid actuator 194 operatively coupled to a second end 180 b of the brake arm 180 , at a location spaced from the pivot axis 182 and the brake pad 178 .
- the second end 180 b of the brake arm 180 and the solenoid actuator 194 are positioned generally above a contact surface 196 a defined by a contact block 196 coupled to the top plate 40 of the film dispenser 12 b.
- An output shaft, or armature, 200 of the solenoid 194 is coupled with the contact surface 196 a such that when the solenoid 194 is actuated to extend the armature 200 in the direction of the contact surface 196 a, the brake arm 180 is moved about the pivot axis 182 to move the brake pad 178 into engagement with the braking surface 176 of the brake disk 172 , as depicted in FIG. 10B . Because the solenoid actuator 194 is spaced a distance from the pivot axis 182 , braking force applied by the brake pad 178 to the braking surface 176 of the brake disk 172 is increased by leverage of the brake arm 180 about the pivot axis 182 .
- the solenoid actuator 194 may be actuated to a first condition wherein the brake pad 178 engages the braking surface 176 with a first braking force that slows rotation of the tension roller 46 to stretch the film material 14 during wrapping of a load 16 .
- the actuator 194 may also be actuated to a second condition wherein the brake pad 178 engages the braking surface 176 with a second braking force that is less than the first braking force, and which prevents free rolling of the tension roller 46 while still allowing the tension roller 46 to rotate when tension is applied to the film web 14 , to facilitate threading film 14 through the dispenser 12 b .
- the second braking force may be selected to provide a minimum resistance to rotation of tension roller 46 that will not cause film 14 to be pulled out of clamp structure that initially secures the film 14 to the load 16 when wrapping of the load 16 with the film 14 is started.
- the actuator 194 may also be actuatable to a third condition wherein the brake pad 178 engages the braking surface 76 of the brake disk 172 with a third braking force that locks the tension roller 46 against rotation.
- the third condition of the actuator 194 may be useful to facilitate intentional tearing or breaking the film 14 after a load 16 has been wrapped.
- the actuator 194 may also be actuatable to a fourth condition wherein the brake pad 178 is either disengaged from the braking surface 176 , or the brake pad 178 only engages the braking surface 176 with a negligible force.
- Solenoid actuator 194 may be remotely adjustable to vary the braking force applied to the braking surface 176 for the various operating conditions of the actuator 194 while the stretch wrapping machine 10 is in use.
- the solenoid actuator 194 may also be programmable to establish multiple settings of the actuator 194 corresponding to the various operating conditions. While the brake assembly 170 has been shown and described as including a solenoid actuator 194 for applying braking force to the tension roller 46 using a brake arm 180 , it will be appreciated that various other actuators may alternatively be used to apply braking force to the tension roller 46 .
- such actuators may include linear or rotary actuators, magnetic, electronic, hydraulic, or pneumatic devices, or any other device suitable for applying force to move the brake arm 180 to bring the brake pad 178 into and out of engagement with the braking surface 176 of the brake disk 172 .
- the brake assembly 210 includes a brake disk 172 coupled with a distal end of the tension roller 46 such that the rotational axis 174 of the disk 172 corresponds with the rotational axis of the tension roller 46 .
- a braking surface 176 is defined on circumferentially extending portions of first and second oppositely disposed sides 172 a , 172 b of the disk 172 , whereby the braking surface 176 extends circumferentially around the tension roller 46 relative to the circumferential film engaging surface 50 .
- the brake assembly 210 further includes a first brake pad 212 supported on a first end 214 a of a first brake arm 214 for pivotal movement with the first brake arm 214 about a first pivot axis 216 that is substantially perpendicular to the rotational axis 174 of the disk 172 , such that the first brake pad 212 is movable into and out of engagement with the braking surface 176 on the first side 172 a of the disk 172 , generally along a direction that is substantially parallel to the rotational axis 174 of the brake disk 172 .
- the second end 214 b of the first brake arm 214 is pivotally coupled to a support block 218 disposed on top plate 40 of the film dispenser 12 c.
- a second brake pad 220 is supported on a first end 222 a of a second brake arm 222 for pivotal movement with the second brake arm 222 about a second pivot axis 224 that is substantially perpendicular to the rotational axis 174 of the disk 172 , such that the second brake pad 220 is movable into and out of engagement with the braking surface 176 on the second side 172 b of the disk 172 , generally along a direction that is substantially parallel to the rotational axis 174 of the brake disk 172 .
- the second end 222 b of the second brake arm 222 is also pivotally coupled to the support block 218 .
- first and second brake arms 214 , 222 may alternatively be supported by various other structure for pivotal movement about pivot axes such that the first and second brake pads 178 are movable into and out of engagement with the braking surface 176 on disk 172 .
- the position of the second brake pad 220 relative to the braking surface 176 on the second side 172 b of the brake disk 172 is selectively adjustable.
- the position of the second brake pad 220 is selectively adjustable by a threaded member 224 disposed on top plate 40 and engaging second brake arm 222 .
- the threaded member 224 can be selectively adjusted to vary the height above top plate 40 at which the threaded member 224 engages a pad mounting block 226 that supports the second brake pad 220 on the first end 222 a of second brake arm 222 . It will be appreciated that various other structure or methods could alternatively be used to vary the position of the second brake pad 220 relative to the braking surface 176 .
- the brake assembly 210 further includes a solenoid actuator 194 supported on bearing plate 48 c and operatively coupled to the first end 214 a of the first brake arm 214 .
- an output shaft, or armature, 200 of the solenoid 194 is coupled with a pad mounting block 228 that supports the first brake pad 212 on the first end 214 a of the first brake arm 214 such that when the solenoid 194 is actuated to extend the armature 200 in the direction of the brake disk 172 , the first end 214 a of the first brake arm 214 is moved about the first pivot axis 216 to move the first brake pad 212 into engagement with the braking surface 176 on the first side 172 a of the brake disk 172 , as depicted in FIG.
- the brake disk 172 rides on or just slightly above the second brake pad 220 until the first brake pad 212 is actuated to move into engagement with the brake disk 172 , whereby the brake disk 172 is engaged by the first brake pad 212 and the second brake pad 220 .
- the tension roller 46 may be resiliently supported proximate the bottom plate 30 of dispenser 12 c for movement along the longitudinal axis of the roller, and biased in a direction toward the bearing plate 48 c to counteract the weight of the tension roller 46 .
- Supporting tension roller 46 in this manner allows the vertical position of the tension roller 46 and brake disk 172 to float relative to the position of the second brake pad 220 , thereby reducing or eliminating friction between the second brake pad 220 and the braking surface 176 on the second side 172 b of brake disk 172 when the first brake pad 212 is disengaged from the braking surface 176 on the first side 172 a of brake disk 172 .
- tension roller 46 is resiliently supported proximate bottom plate 30 by a biasing member 230 , such as a spring. It will be appreciated, however, that various other structure and/or methods may be used to resiliently support tension roller 46 to counteract the weight of the tension roller 46 .
- the solenoid actuator 194 may be actuated to a first condition wherein the first and second brake pads 212 , 220 engage the braking surface 176 with a first braking force that slows rotation of the tension roller 46 to stretch the film material 14 during wrapping of a load 16 .
- the actuator 194 may also be actuated to a second condition wherein the first and second brake pads 212 , 220 engage the braking surface 176 with a second braking force that is less than the first braking force, and which prevents free rolling of the tension roller 46 while still allowing the tension roller 46 to rotate when tension is applied to the film web 14 , to facilitate threading film 14 through the dispenser 12 c.
- the second braking force may be selected to provide a minimum resistance to rotation of tension roller 46 that will not cause film 14 to be pulled out of clamp structure that initially secures the film 14 to the load 16 when wrapping of the load 16 with the film 14 is started.
- the actuator 194 may also be actuatable to a third condition wherein the first and second brake pads 212 , 220 engage the braking surface 176 of the brake disk 172 with a third braking force that locks the tension roller 46 against rotation.
- the third condition of the actuator 194 may be useful to facilitate intentional tearing or breaking the film 14 after a load 16 has been wrapped.
- the actuator 194 may also be actuatable to a fourth condition wherein one or both of the first and second brake pads 212 , 220 are either disengaged from the braking surface 176 , or only engage the braking surface 176 with negligible force.
- Solenoid actuator 194 may be remotely adjustable to vary the braking force applied to the braking surface 176 for the various operating conditions of the actuator 194 while the stretch wrapping machine 10 is in use.
- the solenoid actuator 194 may also be programmable to establish multiple settings of the actuator 194 corresponding to the various operating conditions. While the brake assembly 210 has been shown and described as including a solenoid actuator 194 for applying braking force to the tension roller 46 using brake arms 214 , 222 , it will be appreciated that various other actuators may alternatively be used to apply braking force to the tension roller 46 .
- such actuators may include linear or rotary actuators, magnetic, electronic, hydraulic, or pneumatic devices, or any other device suitable for applying force to move the first brake arm 214 to bring the first brake pad 212 into and out of engagement with the braking surface 176 of the brake disk 172 .
- the brake pads engage only a portion of an area of the circumferential braking surface 176 of brake disk 172 .
- the area can be represented by a sector on one or both sides of disk 172 (according to the particular embodiment), wherein the sector is defined by swinging a radius from the rotational axis of tension roller 46 through an acute angle.
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Abstract
A film dispenser for stretch wrapping machines includes at least one roller and a first brake engageable with a braking surface the one roller. The first brake may include a flat brake pad that is pivotally movable for engagement with the braking surface, and is adjustable between a first configuration engaged with the braking surface and applying a first braking force, and a second configuration disengaged from the braking surface or only minimally engaged with the braking surface such that any braking force applied is substantially less than the first braking force.
Description
- This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61/756,710 filed Jan. 25, 2013 (pending); U.S. Provisional Patent Application Ser. No. 61/787,657 filed Mar. 15, 2013 (pending); U.S. Provisional Patent Application Ser. No. 61/791,479 filed Mar. 15, 2013 (pending); and U.S. Provisional Patent Application Ser. No. 61/856,272 filed Jul. 19, 2013 (pending). The disclosures of which are expressly incorporated by reference herein in their entirety.
- The present invention relates generally to stretch wrapping loads and, more particularly, to improved methods and apparatus for applying film tension and supporting a film supply roll in stretch wrapping machines.
- Various packaging techniques have been used to assemble a load of unit products and subsequently wrap them for transportation, storage, containment and stabilization, protection and waterproofing. Products are often stacked as a load on a pallet to simplify handling of the products. The pallet load is commonly wrapped with stretch wrap packaging material. One system uses stretch wrapping machines to stretch, dispense, and wrap stretch packaging material around a load. Stretch wrapping can be performed as an inline, automated packaging technique that dispenses and wraps packaging material in a stretched condition around a load on a pallet to cover and contain the load. Pallet stretch wrapping, whether accomplished by a turntable, a rotating arm, or by a vertically movable rotating ring, typically covers the vertical sides of the load with a stretchable film, such as polyethylene film. In each of these arrangements, relative rotation is provided between the load and the packaging material dispenser to wrap packaging material around the sides of the load.
- It is generally desirable to stretch the film material prior to wrapping the load. In some machines, pre-stretching of the film is accomplished by first and second pre-stretch rollers that rotate at different speeds so that film material passing between the two rollers is stretched prior to application to a load. In other machines, pre-stretching of the film may be accomplished by applying braking forces to a film web extending between a supply roll and the load.
- Previous methods and apparatus for stretching film material through the application of braking forces have been unsatisfactory. For example, difficulties have been experienced controlling the braking force on a tension roller that stretches film between a supply roll and a load. These variations may be caused by fluctuations in forces in the film web due to the geometry of the load as the film web is being applied by relative rotation between the load and the film dispenser. Oscillation of the film supply roll on a support post may also cause force variations in the film web. These force variations can occur at different wrapping speeds due to the gradual reduction in the mass of the film roll as film is used up. Other force variations may result from the engagement between a brake pad used to apply a braking force to the tension roller as film is applied to a load.
- Accordingly, there is a need for improved methods and apparatus for overcoming these and other drawbacks of conventional stretch wrapping machines.
- The present invention overcomes the foregoing and other shortcomings and drawbacks of apparatus and methods heretofore known for use in stretch wrapping loads. While the invention will be described in connection with certain embodiments, it will be understood that the invention is not limited to these embodiments. On the contrary, the invention includes all alternatives, modifications and equivalents as may be included within the spirit and scope of the present invention.
- According to one aspect of the present disclosure, a film dispenser for stretch wrapping machines includes at least one roller and a first brake engageable with a braking surface the one roller. The first brake is adjustable between a first configuration engaged with the braking surface and applying a first braking force to the braking surface, and a second configuration disengaged from the braking surface or only minimally engaged with the braking surface such that any braking force applied is substantially less than the first braking force. In one embodiment, the first brake may be an electrically-actuated brake. In another embodiment, the first brake may include a flat brake pad that is pivotally movable about a pivot axis spaced from the roller such that the brake pad is movable into engagement with the braking surface generally along a radial direction of the roller.
- In another aspect, a supply roll support for a film dispenser includes an elongate post sized to receive a roll of film thereon, and a pliable sheet coupled with the outer peripheral surface of the post and extending around at least a portion of the outer peripheral surface. At least a portion of the pliable sheet is spaced radially outwardly from the outer peripheral surface for engagement with the inner diameter of a supply roll supported on the post.
- The above and other objects and advantages of the present invention shall be made apparent from the accompanying drawings and the description thereof.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed.
- The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the general description of the invention given above, and the detailed description given below, serve to explain the principles of the invention.
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FIG. 1 is a perspective view of an exemplary stretch wrapping machine in accordance with the principles of the present invention. -
FIG. 2 is an exploded perspective view of an exemplary dispenser of the stretch wrapping machine ofFIG. 1 , illustrating an exemplary brake assembly and an exemplary film roll post in accordance with the principles of the present invention. -
FIG. 3 is a perspective view of an exemplary brake assembly of the dispenser ofFIG. 2 . -
FIG. 4A is a cross-sectional view of the brake assembly ofFIG. 3 , taken alongline 4A-4A. -
FIG. 4B is a cross-sectional view of the brake assembly, similar toFIG. 4A , illustrating operation of the brake assembly with increased preload. -
FIG. 4C is a cross-sectional view of the brake assembly, similar toFIG. 4A , illustrating disengagement of the brake pad. -
FIG. 5 is a partial top view of the brake assembly ofFIG. 4C , taken along line 5-5. -
FIG. 6A is a schematic illustration of the dispenser ofFIG. 2 , illustrating an exemplary path of film material through the dispenser. -
FIG. 6B is a schematic illustration similar toFIG. 6A , illustrating an alternative film path through the dispenser. -
FIG. 7 is a perspective view of a second exemplary brake assembly in accordance with the principles of the present invention. -
FIG. 8 is a top plan view of the brake assembly ofFIG. 7 . -
FIG. 9 depicts a perspective view of a third exemplary brake assembly in accordance with the principles of the present invention. -
FIG. 10A is a side elevation view of the brake assembly ofFIG. 9 . -
FIG. 10B is a side elevation view similar toFIG. 10A , depicting the brake assembly ofFIG. 9 in an engaged condition. -
FIG. 11 is a perspective view of a fourth exemplary brake assembly in accordance with the principles of the present invention. -
FIG. 12A is a side elevation view of the brake assembly ofFIG. 11 . -
FIG. 12B is a side elevation view similar toFIG. 12A , depicting the brake assembly ofFIG. 11 in an engaged condition. -
FIG. 13 is an enlarged detail view of the bottom of the tension roller of the brake assembly ofFIG. 11 . -
FIG. 1 depicts an exemplarystretch wrapping machine 10 including afilm dispenser 12 for applyingpre-stretched film material 14 to aload 16 from asupply roll 18. Thedispenser 12 is coupled to a vertically extendingmast 20. During wrapping of theload 16, thedispenser 12 moves up and down themast 20 while paying outfilm material 14 so that thefilm material 14 is spirally wrapped around theload 16. Thestretch wrapping machine 10 further includes aload support 22 having aturntable 24 for rotating theload 16 supported thereon relative to thedispenser 12 during wrapping of theload 16. -
FIG. 2 is an exploded perspective view of theexemplary film dispenser 12 ofFIG. 1 . Thefilm dispenser 12 includes abottom plate 30 supporting the components of thedispenser 12, and asupply roll post 32 coupled with thebottom plate 30. Thedispenser 12 further includes first andsecond guide rollers journal bearings 38 coupled between thebottom plate 30 and atop plate 40 spaced from thebottom plate 30. Thedispenser 12 further includes abrake assembly 42 supported on thetop plate 40 and enclosed by aremovable cover 44. Atension roller 46 extends between thebottom plate 30 and a bearingplate 48 secured to thetop plate 40. Thetension roller 46 includes a circumferentially extendingfilm engaging surface 50 thatcontacts film material 14 dispensed from thesupply roll 18, and a circumferential braking surface 52 (seeFIG. 4A ). - With continued reference to
FIG. 2 , and referring further toFIGS. 1 , 6A, and 6B,film material 14 from thesupply roll 18 is directed along a film path around one or more of theguide rollers tension roller 46 before being directed toward aload 16 on theturntable 24 for winding upon theload 16.FIGS. 6A and 6B illustrate two exemplary paths for threadingfilm material 14 through thedispenser 12 for application to aload 16. InFIG. 6A , thesupply roll 18 has been placed over thesupport post 32 such thatfilm material 14 is dispensed by rotation of thesupply roll 18 in a clockwise direction about thesupport post 32. InFIG. 6B , thesupply roll 18 has been placed over thesupport post 32 such thatfilm material 14 is dispensed from thesupply roll 18 during counterclockwise rotation of thesupply roll 18 about thesupport post 32. Thetension roller 46 may be coated with a friction material 54 (seeFIG. 4A ) in the region of thefilm engaging surface 50 to increase friction between thetension roller 46 and thefilm material 14, or to prevent slipping of thefilm material 14 circumferentially around thetension roller 46. - Referring now to
FIGS. 3 , 4A, and 5, thebrake assembly 42 includesfirst brake 60 having abrake pad 62 adjustably supported for engagement with thebraking surface 52 of thetension roller 46, whereby thebrake pad 62 is selectively adjustable between a first configuration engaged with thebraking surface 52 such that thebrake pad 62 applies a first braking force to thetension roller 46, and a second configuration disengaged from thebraking surface 52, or only minimally engaging thebraking surface 52 such that a braking force in the second configuration is substantially less than the first braking force. As contemplated herein, the substantially less braking force caused by thebrake pad 62 in the second configuration may only be sufficient to prevent free rolling of thetension roller 46, but in no way adversely affects normal operation of thetension roller 46. - In the embodiment shown, the
brake pad 62 has a generallyflat contact surface 64 and is supported on abrake plate 66 for movement toward and away from thebraking surface 52 of thetension roller 46 generally along a radial direction of thetension roller 46. To this end, thebrake plate 66 is pivotally coupled between the bearingplate 48 and thetop plate 40 at a distance spaced from thetension roller 46 such that thebrake pad 62 is constrained for movement toward and away from thebraking surface 52 of thetension roller 46 generally along a radial direction of thetension roller 46. - In one embodiment, the
brake plate 66 may be pivotally coupled between thetop plate 40 and the bearingplate 48 by a pin connection. Alternatively, thebrake plate 66 may be formed with tabs configured to be received in complementary structure on thetop plate 40 and bearingplate 48 to provide a hinge joint. While thebrake assembly 42 has been shown and described herein as having abrake plate 66 pivotally coupled proximate thetension roller 46 to constrain thebrake pad 62 for movement toward and away from thebraking surface 52 along a generally radial direction, it will be appreciated that various other structure and methods for constraining movement of thebrake pad 62 along a generally radial direction may alternatively be used. - The
brake assembly 42 further includes aspring 70 biasing thebrake plate 66 andbrake pad 62 in a direction toward thebraking surface 52 of thetension roller 46. Thespring 70 is mounted on ashaft 72 extending generally radially from thebraking surface 52. Theshaft 72 is coupled with the bearingplate 48 by ajournal 74 for rotation of theshaft 72 about its longitudinal axis. A length of the shaft includesscrew threads 76, and theshaft 72 supports apressure block 78 having a tappedaperture 80 for receiving thethreads 76 of theshaft 72 such that when theshaft 72 is rotated thepressure block 78 may be moved axially along theshaft 72 to increase or decrease a preload of thespring 70 and thereby vary a biasing force of thespring 70 against thebrake plate 66 andbrake pad 62. Aknob 82 or other control surface may be provided on an end of theshaft 72 opposite the threaded portion, to facilitate rotating theshaft 72 to vary the preload of thespring 70. - In the embodiment shown, movement of the
pressure block 78 along theshaft 72 is guided by aguide rod 84 extending between thebrake plate 66 anddistal end 86 of the bearingplate 48 supporting theshaft 72. Accordingly, the braking force applied by thebrake pad 62 to thecircumferential braking surface 52 of thetension roller 46 may be selectively adjusted by manually turning theknob 82 of theshaft 72 to apply a preload to thebrake pad 62 with thespring 70.FIG. 4B depictsbrake assembly 42 in a condition wherein the preload applied byspring 70 has been increased relative to the preload depicted inFIG. 4A by rotatingknob 82. - In one embodiment, the
brake assembly 42 may further include anindicator 90 that provides a visual indication of the amount of preload selected by manually manipulating theknob 82, as depicted inFIGS. 2 , 3, and 5. In the embodiment shown, theindicator 90 includes anindicator arm 92 pivotally coupled to thepressure block 78 for movement with thepressure block 78 as theshaft knob 82 is manipulated to increase or decrease preload of thespring 70. Afirst end 92 a of theindicator arm 92 extends through anaperture 94 in thetop plate 40, and a second end 92 b of theindicator arm 92 is visible through aslot 96 in thecover 44 when thecover 44 is secured to thedispenser 12. Thecover 44 may include graduations or other visual features adjacent theslot 96 so that the position of the second end 92 b of theindicator arm 92 viewed through theslot 96 may give a visual indication of the amount of preload applied by thespring 70. - Referring now to
FIGS. 2-5 , thebrake assembly 42 may further include arelease mechanism 100 that enables a user to move thebrake pad 62 from the first configuration engaged with thebraking surface 52, to the second configuration disengaged from the braking surface 52 (or only minimally engaging the braking surface 52), as depicted generally inFIG. 4C . In the embodiment shown, therelease mechanism 100 includes alever arm 102 pivotally coupled to thetop plate 40, such as by apivot pin 104. Acam roller 106 is mounted to thelever arm 102 for engagement with acam surface 108 of acam bracket 110 extending upwardly from thepressure block 78. A distal end of thelever arm 102, opposite thepivot pin 104, includes ahandle portion 112 whereby a user may apply force to thehandle portion 112 to engage thecam surface 108 of thecam bracket 110 with thecam roller 106 during movement of thelever arm 102 from a first position depicted inFIGS. 4A and 4B , in a direction towardtop plate 40 to a second position depicted inFIG. 4C . As thecam roller 106 engages thecam surface 108, thepressure block 78 andshaft 72 are forced away from thetension roller 46, thereby removing the bias of thespring 70 against thebrake plate 66 such that thebrake pad 62 can move to the second configuration away from thebraking surface 52. In this configuration, thebrake pad 62 either does not engage thebraking surface 52, or only applies minimal force to thebraking surface 52 as described above. When thelever arm 102 is moved from the second position depicted inFIG. 4C toward the first position depicted inFIGS. 4A and 4B , movement of thelever arm 102 is limited by engagement between atransverse stop member 114 and a vertically extendingstandoff 116. The distal end 166 a ofstandoff 116 is threaded to receive anut 118 for securing thecover 44 over thebrake assembly 42, as depicted inFIGS. 4A-4C . - With continued reference to FIGS. 3 and 4A-4C, and referring further to
FIG. 5 , thebrake assembly 42 may further include a second brake that also engages thecircumferential braking surface 52 of thetension roller 46. In the embodiment shown, the second brake comprises aflexible band 120 engaging at least a portion of thecircumferential braking surface 52. Oneend 120 a of theband 120 is secured to aleg 122 of the bearingplate 48, although it will be appreciated that theband 120 may be secured to any other suitable structure. Asecond end 120 b of theband 120 is secured to apost 124 coupled with thetop plate 40 of thedispenser 12. In the embodiment shown, thesecond end 120 b of theband 120 is secured to thepost 124 by aspring member 126, whereby theband 120 is biased by thespring member 126 into engagement with thecircumferential braking surface 52 of thetension roller 46. The tension of theband 120 against thecircumferential braking surface 52 may be selectively adjusted by adjusting the tension in thespring member 126. The second brake applies a braking force against thecircumferential braking surface 52 that is substantially less than the braking force of the first brake. In one embodiment, the braking force of the second brake is selected to prevent free rolling of thetension roller 46 while otherwise allowing thetension roller 46 to be rotated during threading offilm 14 through thedispenser 12. Alternatively, the braking force of the second brake may be selected to provide a minimum resistance to rotation oftension roller 46 that will not causefilm 14 to be pulled out of clamp structure that initially secures thefilm 14 to theload 16 when wrapping of theload 16 with thefilm 14 is started. In use, the second brake therefore prevents free rolling of thetension roller 46 when the first brake is in the second configuration and disengaged, or substantially less engaged, than the first configuration. - Referring now to
FIGS. 7 and 8 , a second exemplary embodiment of abrake assembly 130 in accordance with the principles of the present invention is described. In this embodiment, aflat brake pad 132 is supported on abrake arm 134 for pivotal movement with thebrake arm 134 about apivot axis 136 spaced from thetension roller 46 such that thebrake pad 132 is movable into and out of engagement with thecircumferential braking surface 52 of thetension roller 46, generally along a radial direction of thetension roller 46. In this embodiment, afirst end 134 a of thebrake arm 134 is supported for pivotal movement about thepivot axis 136 by atie rod 138. Thetie rod 138 extends from asupport block 141 coupled to thetop plate 40 a of the dispenser 12 a, and is operatively coupled to afirst end 134 a of thebrake arm 134. Accordingly, thepivot axis 136 is generally located at the intersection of thebrake arm 134 and thetie rod 138. Thebrake assembly 130 further includes asolenoid actuator 140 operatively coupled to asecond end 134 b of thebrake arm 134, at a location spaced from thepivot axis 136 and thebrake pad 132. In the embodiment shown, thesolenoid actuator 140 is coupled to thetop plate 40 a of the dispenser 12 a by an L-shapedbracket 142. The output shaft, or armature, 144 of thesolenoid 140 is secured to thesecond end 134 b of thebrake arm 134 by acoupling member 146. When thesolenoid 140 is actuated to retract thearmature 144, thebrake arm 134 is moved about thepivot axis 136 such that thebrake pad 132 is moved into engagement with thebraking surface 52 of thetension roller 46. Because thesolenoid 140 is spaced a distance from thepivot axis 136, braking force applied by thebrake pad 132 to the braking surface of thetension roller 46 is increased by leverage of thebrake arm 134 about thepivot axis 136. - Prior to the development of the embodiment depicted in
FIGS. 7-8 , it was believed that solenoids would not be suitable for use in braking a tension roller in a stretch wrapping operation because it was believed that a sufficient amount of force could not be developed over the relatively short stroke of the armature. The mechanical advantage provided by the increased leverage of thebrake arm 134 aboutpivot axis 136 enables thesolenoid actuator 140 to causebrake pad 132 to engage thebraking surface 52 with sufficient force to enable control of thetension roller 46 as described herein. - In operation, the
solenoid actuator 140 may be actuated to a first condition wherein thebrake pad 132 engages thebraking surface 52 with a first braking force that slows rotation of thetension roller 46 to stretch thefilm material 14 during wrapping of aload 16. Theactuator 140 may also be actuated to a second condition wherein thebrake pad 132 engages thebraking surface 52 with a second braking force that is less than the first braking force, and which prevents free rolling of thetension roller 46 while still allowing thetension roller 42 to rotate when tension is applied to thefilm web 14, to facilitatethreading film 14 through the dispenser 12 a. Alternatively, the second braking force may be selected to provide a minimum resistance to rotation oftension roller 46 that will not causefilm 14 to be pulled out of clamp structure that initially secures thefilm 14 to theload 16 when wrapping of theload 16 with thefilm 14 is started. Theactuator 140 may also be actuatable to a third condition wherein thebrake pad 132 engages thebraking surface 52 of thetension roller 46 with a third braking force that locks thetension roller 46 against rotation. The third condition of theactuator 140 may be useful to facilitate intentional tearing or breaking thefilm 14 after aload 16 has been wrapped. Theactuator 140 may also be actuatable to a fourth condition wherein thebrake pad 132 is either disengaged from thebraking surface 52, or thebrake pad 132 only engages thebraking surface 52 with a negligible force. -
Actuator 140 may be remotely adjustable to vary the braking force applied to thebraking surface 52 for the various operating conditions of theactuator 140 while thestretch wrapping machine 10 is in use. Theactuator 140 may also be programmable to establish multiple settings of theactuator 140 corresponding to the various operating conditions. While thebrake assembly 130 has been shown and described as including asolenoid actuator 140 for applying braking force to thetension roller 46 using abrake arm 134, it will be appreciated that various other actuators may alternatively be used to apply braking force to thetension roller 46. As non-limiting examples, such actuators may include linear or rotary actuators, magnetic, electronic, hydraulic, or pneumatic devices, or any other device suitable for applying force to move thebrake arm 134 to bring thebrake pad 132 into and out of engagement with thebraking surface 52 of thetension roller 46. - In the embodiments depicted in
FIGS. 2-5 , 7, and 8, the brake pads engage only a portion of an area of thecircumferential braking surface 52. The area can be represented in part by an arc that is defined by swinging a radius from the rotational axis oftension roller 46 through an acute angle. - Referring now to FIGS. 2 and 6A-6B, an exemplary film
roll support post 32 in accordance with the principles of the present invention will be described. In the embodiment shown, thesupport post 32 is mounted to thedispenser 12 and is fixed against rotation about its longitudinal axis. The outerperipheral surface 150 of thepost 32 is sized to be received within the inner diameter of asupply roll 18 mounted thereon. A first end 32 a of thepost 32 is secured to thebottom plate 30 of thefilm dispenser 12, and athrust washer 152 andbushing 154 are provided thereon for engaging the core of aroll 18 offilm material 14 placed over thepost 32. Thebushing 154 and thrustwasher 152 facilitate rotation of thesupply roll 18 around thepost 32 asfilm material 14 is drawn from thesupply roll 18 for application to aload 16 during wrapping. A selectively removabletop cap 156 may be provided at thesecond end 32 b of thepost 32 to constrain thesupply roll 18 thereon. - The
post 32 further includes a sheet ofpliable material 160 coupled with the outerperipheral surface 150 of thepost 32 and extending generally circumferentially around at least a portion of the outerperipheral surface 150 of thepost 32. At least a portion of thepliable sheet material 160 is secured to thecircumferential surface 150 of thepost 32, such as withfasteners 162, at a location generally opposite thetension roller 46 in thedispenser 12. The length of thepliable sheet 160 is selected such that a portion of thepliable sheet 160 generally opposite thefasteners 162 is bowed to extend outwardly away from the outerperipheral surface 150 of thepost 32, and in a direction generally toward thetension roller 46. Accordingly, when aroll 18 offilm material 14 is placed over thepost 32, the outwardly bowedpliable material 160 biases theroll 18 offilm material 14 in a direction toward thetension roller 46, as generally depicted inFIGS. 6A and 6B . Thepliable sheet 160 is configured on thepost 32 such that thepliable sheet 160 remains in engagement with the various sizes ofcores 164 provided on supply rolls 18 used with thefilm dispenser 12, and applies a friction force to the cores sufficient to prevent the supply rolls 18 from freely rotating on thepost 32. It has also been found that thepliable sheet 160 reduces or eliminates force variations in thefilm web 14 that would otherwise be present due to oscillating displacement of the film rolls 18 about thepost 32. - While the
post 32 has been shown and described herein with apliable sheet 160 secured thereto for biasing thefilm roll 18 in a direction toward thetension roller 46, it will be appreciated that a tube of pliable material may alternatively be secured to post 32 in a manner similar to thepliable sheet 160, such that a portion of such tube extends outwardly from thepost 32 to bias thefilm roll 18 in a direction towardtension roller 46. - While the exemplary embodiments shown and described with respect to
FIGS. 2-8 include braking surfaces defined on circumferentially extending portions of a tension roller proximate the circumferentialfilm engaging surface 50, and include brake pads that move generally along radial directions relative to a rotational axis of the tension roller, it will be appreciated that other embodiments in accordance with the principles of the present invention may include various other types of braking surfaces, and may have brake pads that move into engagement with braking surfaces other than along radial directions, as may be desired. - Referring now to
FIGS. 9 , 10A, and 10B, a third exemplary embodiment of abrake assembly 170 for use with afilm dispenser 12 b in accordance with the principles of the present invention is described. Various components of thefilm dispenser 12 b are similar to those described above with respect toFIGS. 1-2 and 7-8, and similar features are similarly numbered. In this embodiment, thebrake assembly 170 includes abrake disk 172 coupled with a distal end of thetension roller 46 such that therotational axis 174 of thedisk 172 corresponds with the rotational axis of thetension roller 46. Abraking surface 176 is defined on a circumferentially extending portion of thedisk 172, whereby thebraking surface 176 extends circumferentially around thetension roller 46 relative to the circumferentialfilm engaging surface 50. - The
brake assembly 170 further includes abrake pad 178 supported on afirst end 180 a of abrake arm 180 for pivotal movement with thebrake arm 180 about apivot axis 182 spaced from thetension roller 46 such that thebrake pad 178 is movable into and out of engagement with thebraking surface 176 ondisk 172, generally along a direction that is substantially parallel to therotational axis 174 of thebrake disk 172. In this embodiment, thefirst end 180 a of thebrake arm 180 is supported for pivotal movement about thepivot axis 182 by ashaft 184, wherein thepivot 182 axis is substantially perpendicular to therotational axis 174 of thedisk 172. Theshaft 184 is supported by a pair of spaced apartjournal brackets 186 coupled with thetop plate 40 of thedispenser 12 b. It will be appreciated, however thatbrake arm 180 may alternatively be supported by various other structure for pivotal movement about a pivot axis such that thebrake pad 178 is movable into and out of engagement with thebraking surface 176 ondisk 172. - In another embodiment,
brake pad 178 may alternatively be supported on an actuator for movement into and out of engagement with thebraking surface 176, without being mounted on abrake arm 180. For example,brake pad 178 may be mounted on the armature of a solenoid actuator such that actuation of the armature in directions toward or away from thebrake disk 172 moves thebrake pad 178 into and out of engagement with thebraking surface 176 onbrake disk 172. In the embodiment shown, thebrake pad 178 has a generally flat surface for engaging thebraking surface 176, but it will be appreciated that thebrake pad 178 may alternatively have various other configurations suitable for engagement with thebraking surface 176. - The
brake assembly 170 may further include brakeforce reaction assembly 190 located adjacent thebrake disk 172 and generally opposite thebrake pad 178 to support thedisk 172 when braking forces are applied to thebraking surface 176 by thebrake pad 178. In the embodiment shown, the brakeforce reaction assembly 190 includes a rollingelement 192 positioned beneath thebrake disk 172 opposite thebrake pad 178. When braking forces are applied to thebraking surface 176 of thedisk 172 by engagement of thedisk 172 with thebrake pad 178, the rollingelement 192 limits deflection of thebrake disk 172 under the action of braking forces. - In one embodiment, the
brake assembly 170 may be configured such that thebrake disk 172 engages and rides on rollingelement 192 of the brakeforce reaction assembly 190 whentension roller 46 is rotating during operation of thefilm dispenser 12 b. Accordingly, any geometrical irregularities oftension roller 46 with respect to other components offilm dispenser 12 b, such as misalignment or out-of-round conditions of thetension roller 46, may be accommodated by thebrake disk 172 being supported on rollingelement 192. - The
brake assembly 170 further includes asolenoid actuator 194 operatively coupled to asecond end 180 b of thebrake arm 180, at a location spaced from thepivot axis 182 and thebrake pad 178. In the embodiment shown, thesecond end 180 b of thebrake arm 180 and thesolenoid actuator 194 are positioned generally above a contact surface 196 a defined by acontact block 196 coupled to thetop plate 40 of thefilm dispenser 12 b. An output shaft, or armature, 200 of thesolenoid 194 is coupled with the contact surface 196 a such that when thesolenoid 194 is actuated to extend thearmature 200 in the direction of the contact surface 196 a, thebrake arm 180 is moved about thepivot axis 182 to move thebrake pad 178 into engagement with thebraking surface 176 of thebrake disk 172, as depicted inFIG. 10B . Because thesolenoid actuator 194 is spaced a distance from thepivot axis 182, braking force applied by thebrake pad 178 to thebraking surface 176 of thebrake disk 172 is increased by leverage of thebrake arm 180 about thepivot axis 182. - In operation, the
solenoid actuator 194 may be actuated to a first condition wherein thebrake pad 178 engages thebraking surface 176 with a first braking force that slows rotation of thetension roller 46 to stretch thefilm material 14 during wrapping of aload 16. Theactuator 194 may also be actuated to a second condition wherein thebrake pad 178 engages thebraking surface 176 with a second braking force that is less than the first braking force, and which prevents free rolling of thetension roller 46 while still allowing thetension roller 46 to rotate when tension is applied to thefilm web 14, to facilitatethreading film 14 through thedispenser 12 b. Alternatively, the second braking force may be selected to provide a minimum resistance to rotation oftension roller 46 that will not causefilm 14 to be pulled out of clamp structure that initially secures thefilm 14 to theload 16 when wrapping of theload 16 with thefilm 14 is started. Theactuator 194 may also be actuatable to a third condition wherein thebrake pad 178 engages thebraking surface 76 of thebrake disk 172 with a third braking force that locks thetension roller 46 against rotation. The third condition of theactuator 194 may be useful to facilitate intentional tearing or breaking thefilm 14 after aload 16 has been wrapped. Theactuator 194 may also be actuatable to a fourth condition wherein thebrake pad 178 is either disengaged from thebraking surface 176, or thebrake pad 178 only engages thebraking surface 176 with a negligible force. -
Solenoid actuator 194 may be remotely adjustable to vary the braking force applied to thebraking surface 176 for the various operating conditions of theactuator 194 while thestretch wrapping machine 10 is in use. Thesolenoid actuator 194 may also be programmable to establish multiple settings of theactuator 194 corresponding to the various operating conditions. While thebrake assembly 170 has been shown and described as including asolenoid actuator 194 for applying braking force to thetension roller 46 using abrake arm 180, it will be appreciated that various other actuators may alternatively be used to apply braking force to thetension roller 46. As non-limiting examples, such actuators may include linear or rotary actuators, magnetic, electronic, hydraulic, or pneumatic devices, or any other device suitable for applying force to move thebrake arm 180 to bring thebrake pad 178 into and out of engagement with thebraking surface 176 of thebrake disk 172. - Referring now to
FIGS. 11 , 12A, and 12B, a fourth exemplary embodiment of abrake assembly 210 for use with a film dispenser 12 c in accordance with the principles of the present invention is described. Various components of the film dispenser 12 c are similar to those described above with respect tofilm dispenser 12 b shown inFIGS. 9 , 10A, and 10B, and similar features are similarly numbered. Thebrake assembly 210 includes abrake disk 172 coupled with a distal end of thetension roller 46 such that therotational axis 174 of thedisk 172 corresponds with the rotational axis of thetension roller 46. In this embodiment, abraking surface 176 is defined on circumferentially extending portions of first and second oppositely disposedsides disk 172, whereby thebraking surface 176 extends circumferentially around thetension roller 46 relative to the circumferentialfilm engaging surface 50. - The
brake assembly 210 further includes afirst brake pad 212 supported on a first end 214 a of afirst brake arm 214 for pivotal movement with thefirst brake arm 214 about afirst pivot axis 216 that is substantially perpendicular to therotational axis 174 of thedisk 172, such that thefirst brake pad 212 is movable into and out of engagement with thebraking surface 176 on thefirst side 172 a of thedisk 172, generally along a direction that is substantially parallel to therotational axis 174 of thebrake disk 172. In this embodiment, thesecond end 214 b of thefirst brake arm 214 is pivotally coupled to asupport block 218 disposed ontop plate 40 of the film dispenser 12 c. - A
second brake pad 220 is supported on a first end 222 a of asecond brake arm 222 for pivotal movement with thesecond brake arm 222 about asecond pivot axis 224 that is substantially perpendicular to therotational axis 174 of thedisk 172, such that thesecond brake pad 220 is movable into and out of engagement with thebraking surface 176 on thesecond side 172 b of thedisk 172, generally along a direction that is substantially parallel to therotational axis 174 of thebrake disk 172. In this embodiment, thesecond end 222 b of thesecond brake arm 222 is also pivotally coupled to thesupport block 218. It will be appreciated, however that first andsecond brake arms second brake pads 178 are movable into and out of engagement with thebraking surface 176 ondisk 172. - The position of the
second brake pad 220 relative to thebraking surface 176 on thesecond side 172 b of thebrake disk 172 is selectively adjustable. In the embodiment shown, the position of thesecond brake pad 220 is selectively adjustable by a threadedmember 224 disposed ontop plate 40 and engagingsecond brake arm 222. The threadedmember 224 can be selectively adjusted to vary the height abovetop plate 40 at which the threadedmember 224 engages apad mounting block 226 that supports thesecond brake pad 220 on the first end 222 a ofsecond brake arm 222. It will be appreciated that various other structure or methods could alternatively be used to vary the position of thesecond brake pad 220 relative to thebraking surface 176. - The
brake assembly 210 further includes asolenoid actuator 194 supported on bearing plate 48 c and operatively coupled to the first end 214 a of thefirst brake arm 214. In the embodiment shown, an output shaft, or armature, 200 of thesolenoid 194 is coupled with apad mounting block 228 that supports thefirst brake pad 212 on the first end 214 a of thefirst brake arm 214 such that when thesolenoid 194 is actuated to extend thearmature 200 in the direction of thebrake disk 172, the first end 214 a of thefirst brake arm 214 is moved about thefirst pivot axis 216 to move thefirst brake pad 212 into engagement with thebraking surface 176 on thefirst side 172 a of thebrake disk 172, as depicted inFIG. 12B . Thebrake disk 172 rides on or just slightly above thesecond brake pad 220 until thefirst brake pad 212 is actuated to move into engagement with thebrake disk 172, whereby thebrake disk 172 is engaged by thefirst brake pad 212 and thesecond brake pad 220. - In another aspect in accordance with this embodiment, the
tension roller 46 may be resiliently supported proximate thebottom plate 30 of dispenser 12 c for movement along the longitudinal axis of the roller, and biased in a direction toward the bearing plate 48 c to counteract the weight of thetension roller 46. Supportingtension roller 46 in this manner allows the vertical position of thetension roller 46 andbrake disk 172 to float relative to the position of thesecond brake pad 220, thereby reducing or eliminating friction between thesecond brake pad 220 and thebraking surface 176 on thesecond side 172 b ofbrake disk 172 when thefirst brake pad 212 is disengaged from thebraking surface 176 on thefirst side 172 a ofbrake disk 172. In the exemplary embodiment shown inFIG. 13 ,tension roller 46 is resiliently supportedproximate bottom plate 30 by a biasingmember 230, such as a spring. It will be appreciated, however, that various other structure and/or methods may be used to resiliently supporttension roller 46 to counteract the weight of thetension roller 46. - In operation, the
solenoid actuator 194 may be actuated to a first condition wherein the first andsecond brake pads braking surface 176 with a first braking force that slows rotation of thetension roller 46 to stretch thefilm material 14 during wrapping of aload 16. Theactuator 194 may also be actuated to a second condition wherein the first andsecond brake pads braking surface 176 with a second braking force that is less than the first braking force, and which prevents free rolling of thetension roller 46 while still allowing thetension roller 46 to rotate when tension is applied to thefilm web 14, to facilitatethreading film 14 through the dispenser 12 c. Alternatively, the second braking force may be selected to provide a minimum resistance to rotation oftension roller 46 that will not causefilm 14 to be pulled out of clamp structure that initially secures thefilm 14 to theload 16 when wrapping of theload 16 with thefilm 14 is started. Theactuator 194 may also be actuatable to a third condition wherein the first andsecond brake pads braking surface 176 of thebrake disk 172 with a third braking force that locks thetension roller 46 against rotation. The third condition of theactuator 194 may be useful to facilitate intentional tearing or breaking thefilm 14 after aload 16 has been wrapped. Theactuator 194 may also be actuatable to a fourth condition wherein one or both of the first andsecond brake pads braking surface 176, or only engage thebraking surface 176 with negligible force. -
Solenoid actuator 194 may be remotely adjustable to vary the braking force applied to thebraking surface 176 for the various operating conditions of theactuator 194 while thestretch wrapping machine 10 is in use. Thesolenoid actuator 194 may also be programmable to establish multiple settings of theactuator 194 corresponding to the various operating conditions. While thebrake assembly 210 has been shown and described as including asolenoid actuator 194 for applying braking force to thetension roller 46 usingbrake arms tension roller 46. As non-limiting examples, such actuators may include linear or rotary actuators, magnetic, electronic, hydraulic, or pneumatic devices, or any other device suitable for applying force to move thefirst brake arm 214 to bring thefirst brake pad 212 into and out of engagement with thebraking surface 176 of thebrake disk 172. - In the embodiments depicted in
FIGS. 9-12B , the brake pads engage only a portion of an area of thecircumferential braking surface 176 ofbrake disk 172. The area can be represented by a sector on one or both sides of disk 172 (according to the particular embodiment), wherein the sector is defined by swinging a radius from the rotational axis oftension roller 46 through an acute angle. - While the present invention has been illustrated by the description of one or more embodiments thereof, and while the embodiments have been described in considerable detail, they are not intended to restrict or in any way limit the scope of the appended claims to such detail. Additional advantages and modifications will readily appear to those skilled in the art. The invention in its broader aspects is therefore not limited to the specific details, representative apparatus and methods and illustrative examples shown and described. Accordingly, departures may be made from such details without departing from the scope or spirit of Applicants' general inventive concept.
Claims (20)
1. A film dispenser for stretch wrapping machines, comprising:
at least one roller, the roller having a longitudinal axis and a circumferential film engaging surface;
a braking surface extending circumferentially around the roller relative to the circumferential film engaging surface; and
an electrically-actuated first brake engageable with either a portion of a sector of the braking surface or a portion of an area defined by an arc along the braking surface of the at least one roller, the first brake selectively adjustable between a first configuration engaged with the braking surface and applying a first braking force to the braking surface, and a second configuration wherein the first brake is disengaged from the braking surface or is only minimally engaged such that any braking force applied is substantially less than the first braking force.
2. The film dispenser of claim 1 , further comprising:
a disk coupled with a first axial end of the at least one roller, the disk having first and second oppositely disposed sides;
wherein the braking surface is located on circumferentially extending portions of the first and second sides of the disk.
3. The film dispenser of claim 2 , wherein the first brake comprises a first brake pad adjacent the first side of the disk and a second brake pad adjacent the second side of the disk, such that the disk is disposed between the first and second brake pads;
at least one of the first and second brake pads movable between the first and second configurations of the first brake along directions substantially parallel to an axial direction of the disk.
4. The film dispenser of claim 2 , wherein the first brake is selectively adjustable to vary the amount of first braking force applied to the braking surface.
5. The film dispenser of claim 3 , wherein the first brake comprises an actuator operatively coupled with the first brake pad, the actuator selectively actuatable to at least a first condition wherein the first and second brake pads engage the braking surface in the first configuration of the first brake, and wherein the first braking force stretches the film material during wrapping of a load.
6. The film dispenser of claim 5 , wherein the actuator is actuatable to a second condition wherein the first and second brake pads engage the braking surface in the first configuration of the first brake, and wherein the first brake applies a second braking force that prevents free rolling of the roller while allowing the roller to rotate to facilitate threading of film through the dispenser.
7. The film dispenser of claim 6 , wherein the actuator is actuatable to a third condition wherein the first and second brake pads engage the braking surface in the first configuration of the first brake, and wherein the first brake applies a third braking force that locks the roller against rotation.
8. The film dispenser of claim 7 , wherein the actuator is actuatable to a fourth condition wherein at least the first brake pad is disengaged from the braking surface in the second configuration of the first brake.
9. The film dispenser of claim 5 , further comprising:
a first brake arm pivotally movable about a first pivot axis that is substantially perpendicular to the axial direction of the disk;
the first brake pad supported on the first brake arm for pivotal movement about the first pivot axis into engagement with the braking surface.
10. The film dispenser of claim 9 , further comprising:
a second brake arm pivotally movable about a second pivot axis that is substantially perpendicular to the axial direction of the disk;
the second brake pad supported on the second brake arm for pivotal movement about the second pivot axis into engagement with the braking surface.
11. The film dispenser of claim 10 , wherein the roller is resiliently supported for movement in a direction along the longitudinal axis of the roller and biased in a direction toward the disk to compensate for the weight of the roller.
12. The film dispenser of claim 1 , wherein the first brake comprises a solenoid actuator having an armature operatively coupled with a first brake pad, the armature moving the first brake pad to engage the braking surface in the first configuration of the first brake.
13. The film dispenser of claim 12 , wherein the solenoid actuator is selectively actuatable to at least a first condition wherein the first brake pad engages the braking surface in the first configuration of the first brake, and wherein the first braking force stretches the film material during wrapping of a load.
14. The film dispenser of claim 13 , wherein the solenoid actuator is actuatable to a second condition wherein the first brake pad engages the braking surface in the first configuration of the first brake, and wherein the first brake applies a second braking force that prevents free rolling of the roller while allowing the roller to rotate to facilitate threading of film through the dispenser.
15. The film dispenser of claim 14 , wherein the solenoid actuator is actuatable to a third condition wherein the first brake pad engages the braking surface in the first configuration of the first brake, and wherein the first brake applies a third braking force that locks the roller against rotation.
16. The film dispenser of claim 15 , wherein the solenoid actuator is actuatable to a fourth condition wherein the first brake pad is disengaged from the braking surface in the second configuration of the first brake.
17. A film dispenser for stretch wrapping machines, comprising:
at least one roller, the roller having a circumferential film engaging surface and a circumferential braking surface;
a brake arm pivotally movable about a pivot axis spaced from the roller;
a brake pad supported on the brake arm for pivotal movement with the brake arm about the pivot axis into engagement with the braking surface along a substantially radial direction of the roller; and
an actuator operatively engaging the brake arm at a location spaced from the pivot axis and the brake pad, whereby braking force applied by the brake pad when the actuator is actuated is increased by leverage of the brake arm about the pivot axis.
18. The film dispenser of claim 17 , wherein the actuator selectively actuatable to at least one of:
a first condition wherein the brake pad engages the braking surface with a first braking force that stretches the film material during wrapping of a load.
a second condition wherein the brake pad engages the braking surface with a second braking force that prevents free rolling of the roller while allowing the roller to rotate to facilitate threading of film through the dispenser;
a third condition wherein the brake pad engages the braking surface with a third braking force that locks the roller against rotation; or
a fourth condition wherein the brake pad is disengaged from the braking surface.
19. A method of dispensing stretch wrap material to a load, the method comprising:
feeding film from a supply roll;
engaging the film from the supply roll with at least one roller;
selectively engaging the roller with a first brake; and
engaging the roller with a second brake.
20. The method of claim 19 , further comprising applying at least one of:
a first braking force to the roller with the first brake such that the film is stretched as it is applied to wrap the load;
a second braking force to the roller with the second brake, the second braking force preventing prevent free rolling of the roller while allowing the roller to rotate sufficiently to facilitate threading film from the supply roll to the roller when the first brake is not engaged; or
a third braking force to the roller with the first brake such that the roller is locked against rotation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/163,471 US20140208696A1 (en) | 2013-01-25 | 2014-01-24 | Film Tension Apparatus And Supply Roll Support For Stretch Wrapping Machines |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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US201361756710P | 2013-01-25 | 2013-01-25 | |
US201361794479P | 2013-03-15 | 2013-03-15 | |
US201361787657P | 2013-03-15 | 2013-03-15 | |
US201361856272P | 2013-07-19 | 2013-07-19 | |
US14/163,471 US20140208696A1 (en) | 2013-01-25 | 2014-01-24 | Film Tension Apparatus And Supply Roll Support For Stretch Wrapping Machines |
Publications (1)
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US20140208696A1 true US20140208696A1 (en) | 2014-07-31 |
Family
ID=51221420
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/163,471 Abandoned US20140208696A1 (en) | 2013-01-25 | 2014-01-24 | Film Tension Apparatus And Supply Roll Support For Stretch Wrapping Machines |
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US (1) | US20140208696A1 (en) |
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US20130300047A1 (en) * | 2012-05-08 | 2013-11-14 | Lantech.Com, Llc | Turntable Assembly For Stretch Wrapping Machine |
CN104401522A (en) * | 2014-11-25 | 2015-03-11 | 长沙长泰机械股份有限公司 | Full-automatic vertical PE (Poly Ethylene) film packaging machine |
US20180050832A1 (en) * | 2015-02-09 | 2018-02-22 | Signode Industrial Group Llc | Method for wrapping plastic film on a load and wrapping machine |
CN108016672A (en) * | 2017-12-01 | 2018-05-11 | 常德金德新材料科技股份有限公司 | A kind of baling press |
US20180273226A1 (en) * | 2015-09-25 | 2018-09-27 | Lantech.Com, Llc | Stretch Wrapping Machine with Automated Determination of Load Stability by Subjecting a Load to a Disturbance |
CN110451020A (en) * | 2019-07-23 | 2019-11-15 | 范曦丰 | A kind of PVC transparent film membrane coiler with anti-string film overlapping |
US20200406571A1 (en) * | 2016-05-16 | 2020-12-31 | Cmd Corporation | Method and apparatus for pouch making |
US10926906B2 (en) | 2014-10-07 | 2021-02-23 | Lantech.Com, Llc | Load stability-based wrapping |
US20210253282A1 (en) * | 2012-06-18 | 2021-08-19 | TAB Industries, LLC | Stretch film dispenser for orbital pallet wrappers |
US11136151B1 (en) * | 2018-04-23 | 2021-10-05 | Michael Baker | Orbital wrapping machine |
US11345495B2 (en) | 2015-04-10 | 2022-05-31 | Lantech.Com, Llc | Stretch wrapping machine supporting top layer containment operations |
US20220169468A1 (en) * | 2020-11-30 | 2022-06-02 | Neil G. Cousins | Stretch wrap film carriage |
US11407538B2 (en) | 2013-02-13 | 2022-08-09 | Lantech.Com, Llc | Packaging material profiling for containment force-based wrapping |
US11479378B2 (en) | 2019-09-09 | 2022-10-25 | Lantech.Com, Llc | Stretch wrapping machine with dispense rate control based on sensed rate of dispensed packaging material and predicted load geometry |
US11518557B2 (en) | 2019-09-19 | 2022-12-06 | Lantech.Com, Llc | Packaging material grading and/or factory profiles |
US11597554B2 (en) | 2014-01-14 | 2023-03-07 | Lantech.Com, Llc | Dynamic adjustment of wrap force parameter responsive to monitored wrap force and/or for film break reduction |
US11667416B2 (en) | 2017-09-22 | 2023-06-06 | Lantech.Com, Llc | Load wrapping apparatus wrap profiles with controlled wrap cycle interruptions |
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Cited By (27)
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US9284079B2 (en) * | 2012-05-08 | 2016-03-15 | Lantech.Com, Llc | Turntable assembly for stretch wrapping machine |
US20130300047A1 (en) * | 2012-05-08 | 2013-11-14 | Lantech.Com, Llc | Turntable Assembly For Stretch Wrapping Machine |
US20210253282A1 (en) * | 2012-06-18 | 2021-08-19 | TAB Industries, LLC | Stretch film dispenser for orbital pallet wrappers |
US11518558B2 (en) | 2013-02-13 | 2022-12-06 | Lantech.Com, Llc | Containment force-based wrapping |
US11407538B2 (en) | 2013-02-13 | 2022-08-09 | Lantech.Com, Llc | Packaging material profiling for containment force-based wrapping |
US11912445B2 (en) | 2013-02-13 | 2024-02-27 | Lantech.Com, Llc | Containment force-based wrapping |
US11685567B2 (en) | 2014-01-14 | 2023-06-27 | Lantech.Com, Llc | Dynamic adjustment of wrap force parameter responsive to monitored wrap force and/or for film break reduction |
US11597554B2 (en) | 2014-01-14 | 2023-03-07 | Lantech.Com, Llc | Dynamic adjustment of wrap force parameter responsive to monitored wrap force and/or for film break reduction |
US10926906B2 (en) | 2014-10-07 | 2021-02-23 | Lantech.Com, Llc | Load stability-based wrapping |
CN104401522A (en) * | 2014-11-25 | 2015-03-11 | 长沙长泰机械股份有限公司 | Full-automatic vertical PE (Poly Ethylene) film packaging machine |
US20180050832A1 (en) * | 2015-02-09 | 2018-02-22 | Signode Industrial Group Llc | Method for wrapping plastic film on a load and wrapping machine |
US11345495B2 (en) | 2015-04-10 | 2022-05-31 | Lantech.Com, Llc | Stretch wrapping machine supporting top layer containment operations |
US11034470B2 (en) | 2015-09-25 | 2021-06-15 | Lantech.Com, Llc | Stretch wrapping machine with automatic load profiling |
US10934034B2 (en) * | 2015-09-25 | 2021-03-02 | Lantech.Com, Llc | Stretch wrapping machine with automated determination of load stability by subjecting a load to a disturbance |
US11731793B2 (en) | 2015-09-25 | 2023-08-22 | Lantech.Com, Llc | Stretch wrapping machine with automatic load profiling |
US20180273226A1 (en) * | 2015-09-25 | 2018-09-27 | Lantech.Com, Llc | Stretch Wrapping Machine with Automated Determination of Load Stability by Subjecting a Load to a Disturbance |
US11505343B2 (en) | 2015-09-25 | 2022-11-22 | Lantech.Com, Llc | Stretch wrapping machine with automated determination of load stability by subjecting a load to a disturbance |
US20220001638A1 (en) * | 2016-05-16 | 2022-01-06 | Cmd Corporation | Method And Apparatus For Pouch Or Bag Making |
US20200406571A1 (en) * | 2016-05-16 | 2020-12-31 | Cmd Corporation | Method and apparatus for pouch making |
US11667416B2 (en) | 2017-09-22 | 2023-06-06 | Lantech.Com, Llc | Load wrapping apparatus wrap profiles with controlled wrap cycle interruptions |
CN108016672A (en) * | 2017-12-01 | 2018-05-11 | 常德金德新材料科技股份有限公司 | A kind of baling press |
US11136151B1 (en) * | 2018-04-23 | 2021-10-05 | Michael Baker | Orbital wrapping machine |
CN110451020A (en) * | 2019-07-23 | 2019-11-15 | 范曦丰 | A kind of PVC transparent film membrane coiler with anti-string film overlapping |
CN112758414A (en) * | 2019-07-23 | 2021-05-07 | 范曦丰 | PVC transparent film winding machine and operation method |
US11479378B2 (en) | 2019-09-09 | 2022-10-25 | Lantech.Com, Llc | Stretch wrapping machine with dispense rate control based on sensed rate of dispensed packaging material and predicted load geometry |
US11518557B2 (en) | 2019-09-19 | 2022-12-06 | Lantech.Com, Llc | Packaging material grading and/or factory profiles |
US20220169468A1 (en) * | 2020-11-30 | 2022-06-02 | Neil G. Cousins | Stretch wrap film carriage |
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Owner name: LANTECH.COM, LLC, KENTUCKY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PHILLIPS, THOMAS E.;HENDREN, DANIEL R.;JANES, ROBERT D., SR;AND OTHERS;SIGNING DATES FROM 20140130 TO 20140211;REEL/FRAME:032247/0724 |
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