[0001] The present invention relates to a towel dispenser. More particularly, the present
invention relates to a paper towel dispenser.
[0002] It is known to provide first and second rolls of towel for dispensing from a paper
towel dispenser. When the first roll is exhausted, the second roll may be automatically
transferred onto a support roller for dispensing. When the dispenser is serviced,
the second roll is generally moved to the first roll position and a replacement second
roll inserted.
[0003] US 6,314,850 discloses a paper towel dispensing apparatus having a rotatable member for loading
towel from a second roll onto a support roller when towel from a first roll is depleted.
A clip is provided at each end of the rotatable member to secure the towel from the
second roll in position and, upon depletion of the towel from the first roll, the
rotatable member is brought into contact with the support roller and rotated to supply
towel from the second roll to the support roller. A spring is provided at each end
of the support roller to bias the rotatable member against the support roller. However,
it can prove difficult to secure the towel on the rotatable member using the spring-loaded
clips. If it is not properly positioned, the towel may rip as the rotatable member
rotates, preventing the towel from being transferred successfully onto the support
roller. Moreover, if the springs for biasing the rotatable member towards the support
roller are not matched, the towel may not be uniformly pressed against the support
roller and it may skew in relation to the support roller leading to fouling of the
apparatus.
[0004] US 6,826,985 discloses a paper towel dispensing apparatus for dispensing towel from first and
second rolls from a support roller. The apparatus comprises a dispensing roller and
a transfer roller for supplying towel to the support roller. Towel from the first
roll is supplied to the support roller via the transfer roller. A channel extends
through the dispensing roller for receiving a lead end of towel from the second roll
and a series of raised portions provided on the dispensing roller contact the towel
carried by the transfer roller and prevent rotation of the dispensing roller until
the towel from a first roll is depleted. When the towel from the first roll is depleted,
the dispensing roller is brought into contact with the transfer roller and rotated,
thereby loading the towel from the second roll onto the transfer roller. However,
loading the towel from the second roll through the channel in the dispensing roller
may be time consuming. Moreover, if towel from the first roll rips, feeding the end
of the towel onto the support roller may prove difficult as the raised portions on
the dispensing roller restrict access.
[0005] A further limitation of known paper towel dispensers is that they typically dispense
a sheet of towel having a length corresponding to the circumference of the support
roller during each operational cycle. A cutter blade is actuated to cut the paper
towel each time the support roller completes a single complete revolution. To allow
a length of towel of adequate length to be dispensed, the diameter of the support
roller has to be relatively large thereby increasing the size of the towel dispenser.
[0006] It is known from
PCT/US95/02506, published as
WO9523677, to provide a drive roller and a cutting blade
support member on a frame. The cutting blade support member is mounted behind the
drive roller and a V-shaped slot is provided in the drive roller for receiving a cutting
blade mounted on the support member. A spur gear is attached to the cutting blade
support member and meshes with a drive gear attached to the drive roller. The ratio
of the drive gear to the spur gear is such that for every two rotations of the drive
roller the cutting blade support member rotates once with the cutting blade being
inserted into the V- shaped slot to cut the paper towel. The arrangement of the cutting
blade and the drive roller externally of the drive roller results in a relatively
large towel dispenser.
[0007] The pre-characterising features of claim 1 of the present application are known from
EP 0933054.
[0008] The present invention, at least in preferred embodiments, attempts to overcome or
ameliorate at least some of the problems associated with the prior art dispensers.
[0009] Viewed from a first aspect, the present invention relates to a paper towel dispensing
apparatus for dispensing paper towel from a first roll, the apparatus comprising:
a housing having a cover;
a rotatable support roller for supporting the towel to be dispensed; and
a towel biasing device coupled to said cover, the towel biasing device being displaced
to a first position for biasing towel against the support roller when the cover is
closed; and the towel biasing device being displaced to a second position for facilitating
the loading of towel when the cover is opened;
the apparatus further comprising a towel transfer mechanism for transferring towel
from a second roll onto the support roller, the towel biasing device comprising a
towel biasing member pivotable about a first axis substantially parallel to a rotational
axis of the support roller, wherein the towel biasing device is operable to bias towel
from the second roll against the support roller; and
the towel transfer mechanism comprising a floating member for cooperating with the
towel from the first roll to control the towel biasing device;
characterised in that a pathway is provided between the floating member and the towel
biasing device for receiving towel from the second roll ready for transfer onto the
support roller when the towel from the first roll is depleted.
[0010] By coupling the towel biasing device to the cover, it may automatically be displaced
to said first position when the cover is closed. Likewise, the towel biasing device
may automatically be displaced to said second position when the cover is opened. The
towel biasing device is preferably positioned adjacent the support roller when in
said first position; and is preferably displaced from the support roller when in said
second position.
[0011] It will be appreciated that the movement of the towel biasing device to either said
first position or said second position could be performed manually. For example, the
towel biasing device may be coupled to the cover such that it is displaced to said
second position by the action of opening the cover, but returning the towel biasing
device to the first position is performed manually before the cover is closed. Conversely,
the towel biasing device could be manually moved to the second position after the
cover has been opened, but the towel biasing device coupled to the cover such/that
it is returned to the first position by the action of closing the cover. However the
towel biasing
device is coupled to the cover such that it is moved to the first and second positions
by the action of closing and opening the cover respectively.
[0012] The towel is typically provided between the support roller and the towel biasing
device for dispensing. At least in preferred embodiments, when the dispensing apparatus
is serviced, the cover is opened and the towel biasing device displaced to said second
position to facilitate the positioning of towel between the support roller and the
towel biasing device. The cover is then closed and may thereby return the towel biasing
device to its first position adjacent to the support roller and may bias the towel
against the support roller.
[0013] The towel biasing device could be mounted on one or more arms coupled to the cover.
Preferably, however, the towel biasing device is mounted on the cover.
[0014] The towel biasing device comprises a towel biasing member, such as an elongate member
or plate, for engaging the towel and biasing the towel against the support roller.
The biasing member is pivotably mounted. The biasing member is pivotable about an
axis substantially parallel to a rotational axis of the support roller. A spring could
be provided for biasing the biasing member towards the support roller. Alternatively,
the biasing member may be biased towards the support roller by gravity.
[0015] The towel transfer mechanism comprises a movable control member for cooperating with
the towel from the first roll. The control member is referred to hereafter as a floating
member but the terms are interchangeable. The floating member could be slidably mounted,
for example in a pair of elongate channels. Preferably, however, the floating member
is pivotably mounted. The floating member is preferably pivotable about an axis substantially
parallel to the rotational axis of the support roller. A pathway for receiving towel
is provided between the floating member and the towel biasing device. The pathway
preferably extends at least substantially across the width of the support member.
In use, a length of towel from the second roll may be located in said pathway ready
for transfer onto the support roller when the towel from the first roll is depleted.
[0016] The floating member operatively controls actuation of the towel biasing device. The
movement of the floating member, for example upon depletion of the towel from the
first roll, preferably actuates the towel biasing device to bias towel onto the support
roller.
[0017] A first side of the floating member is preferably provided with at least one projection
for engaging the towel from the first roll. The at least one projection is preferably
at least one fin or rib. A corresponding recess is preferably provided in the support
roller for receiving the or each projection. The recess is preferably an annular groove
or an aperture. A second side of the floating member is preferably suitable for supporting
the towel from the second roll. The second side of the floating member preferably
faces the towel biasing device.
[0018] In use, the at least one projection contacts the towel from the first roll on the
support roller and is prevented from locating in the corresponding recess (or recesses)
provided in the support roller. When the towel from the first roll is depleted, the
at least one projection locates in the recess in the support roller and the floating
member moves towards the support roller. The resulting movement of the floating member
may actuate the towel biasing device. Preferably, the movement of the floating member
allows the biasing member to bias the towel from the second roll against the support
roller. Thus, towel from the second roll may be transferred onto the support roller
by the towel biasing device.
[0019] The support roller is preferably rotated by applying a pulling force to the end of
the towel being dispensed. A manual drive, such as a wheel or handle, may be provided
for rotating the support roller. The manual drive may be used to rotate the support
roller to draw towel from the second roll through the dispensing apparatus once it
has been transferred onto the support roller by the transfer mechanism. Alternatively,
or in addition, a spring element may be provided automatically to rotate the support
wheel once the towel from the second roll has been transferred.
[0020] The dispensing apparatus preferably comprises a tensioning arm for maintaining the
towel under tension. The tensioning arm is preferably suitable for engaging the towel
between the biasing member and the roll of towel. The tensioning arm may form part
of the towel biasing device.
[0021] The cover is preferably pivotably mounted. Preferably, the cover is pivotable about
an axis substantially coincident with the axis about which the first roll or the second
roll is rotatable. If the towel biasing device is mounted on the cover this arrangement
is advantageous since it reduces the likelihood of the towel biasing device fouling
on the second roll of towel when the cover is opened or closed. Preferably, a portion
of the cover may be received inside the housing of the dispensing apparatus when the
cover is pivoted to an open position.
[0022] The paper towel dispensing apparatus preferably comprises a cutter blade for cutting
the towel from said first and second rolls. The cutter blade could be fixedly mounted,
for example on the housing. Preferably, however, the cutter blade is movable to a
cutting position. The cutter blade may be slidably or pivotably mounted. The rotation
of the support roller preferably actuates the cutter blade and moves it to said cutting
position.
[0023] The cutter blade preferably comprises a tip which extends, when the cutter blade
is in the cutting position, at least in part in a direction opposite to the direction
of rotation of the support roller when the towel is dispensed. The tip of the cutter
blade is therefore disposed against movement of the towel as it is dispensed, which
assists in the cutting of the towel. Preferably, the cutter blade has a curved cross-sectional
profile to orient the tip rearwardly relative to the direction of rotation of the
support roller when the cutter blade is actuated. The tip may be formed at a distal
end of the cutter blade such that it is displaced from said support roller. The cutter
blade preferably comprises a plurality of said tips.
[0024] The cutter blade may be mounted on the housing, but it is preferably mounted in the
support roller. Preferably, at least a portion of the cutter blade extends outwardly
beyond the outer circumference of the support roller when it is in said cutting position.
The cutter blade preferably extends substantially radially outwardly when it is in
said cutting position. A stop or guide member is preferably provided to limit the
travel of the cutter blade so as not to pivot beyond said radial position. Preferably,
the cutter blade is retractable at least substantially into an interior of the support
roller.
[0025] The cutter blade is preferably actuated each time the support roller completes a
plurality of whole revolutions. The cutter blade may be actuated each time the support
roller completes two (2), three (3) or four (4) revolutions. This is advantageous
since the length of towel dispensed may be larger than the circumference of the support
roller. For example, if the cutter blade is actuated each time the support roller
completes two revolutions, the length of towel dispensed will be twice the circumference
of the support roller. Thus, the diameter of the support roller may be smaller than
those of prior art dispensers.
[0026] A cutter blade actuator is preferably provided. The actuator preferably comprises
a gear train. The gear train preferably couples the support roller to an axle on which
at least one cam is mounted. The cutter blade is preferably provided with at least
one cam follower for following said at least one cam.
[0027] Viewed from a further aspect, the present invention relates to a method of servicing
a paper towel dispensing apparatus as described herein, the method comprising the
steps of:
- (a) moving the cover to an open position and thereby displacing the towel biasing
device to said second position displaced from the support roller;
- (b) loading the towel dispensing apparatus with a first roll of towel and/or a second
roll of towel;
- (c) positioning a lead end of the towel to be dispensed over the rotatable support
roller; and
- (d) moving the cover to a closed position and thereby returning the towel biasing
device to said first position proximal the support roller.
[0028] Preferred embodiments of the present invention will now be described, by way of example
only, with reference to the accompanying Figures, in which:
Figure 1 shows an exploded perspective view of a paper towel dispenser in accordance
with a first preferred embodiment of the present invention;
Figure 2 shows a perspective view of the support roller assembly according to the
first embodiment with the cutter in a retracted position;
Figure 3 shows a perspective view of the support roller assembly according to the
first embodiment with the cutter in an extended position;
Figures 4A and 4B show cross-sectional views along sections A-A and B-B of Figure
2 with the cutter blades in a retracted position;
Figures 5A and 5B show cross-sectional views along sections A'-A' and B'-B' of Figure
3 with the cutter blades in an extended position;
Figure 6 shows schematically the path of paper towel from a first roll and a second
roll with the cover closed;
Figure 7 shows schematically the supply of paper towel from the first roll and the
second roll with the cover open;
Figures 8A and 8B show cross-sectional views of a second embodiment of the present
invention with the cutter blades in a retracted position, the cross-sectional views
being along sections equivalent to sections A-A and B-B illustrated in Figure 2 in
respect of the first embodiment; and
Figures 9A and 9B show cross-sectional views of the second embodiment with the cutter
blades in an extended position, the cross-sectional views being along sections equivalent
to sections A'-A' and B'-B' illustrated in Figure 3 in respect of the first embodiment.
[0029] An exploded perspective view of a paper towel dispenser 1 for dispensing paper towel
T' from a first roll 3 and towel T" from a second roll 5 in accordance with a first
embodiment of the present invention is shown in Figure 1. The dispenser 1 comprises
a support roller assembly 7, a towel guide assembly 9, a front tension plate 11, a
floating plate 13 and a towel loading assembly 15.
[0030] A dispenser cover 17 is provided for covering the support roller assembly 7 and the
first and second rolls 3, 5. The cover 17 is pivotably mounted on a back plate 19
and may be opened to facilitate servicing of the dispenser 1. First and second side
panels 21, 23 are provided to complete the dispenser housing. A rotary knob 25 is
provided in the first side panel 21 to allow the support roller assembly 7 to be driven
manually.
[0031] The cover 17 is pivotable about an axis substantially parallel with the axis about
which the second roll rotates. This arrangement could be modified such that the cover
17 pivots about an axis substantially coincident with the axis about which the second
roll rotates and arranged such that a portion of the cover 17 locates between the
second roll 5 and the back plate 19 when the cover is open. A lock (not shown) is
provided for securing the cover to prevent unauthorised access.
[0032] The second roll 5 is rotatably mounted on roll carrier arms 27, 29 mounted on the
back plate 19. The first roll 5 is supported on a curved section 31 of the base of
the dispenser 1. The centre of the first and second rolls 3, 5 may be open to allow
the rolls 3, 5 to be carried on an axle mounted on said first and second roll carriers.
Alternatively, the rolls 3, 5 may have a central tube, for example made of cardboard,
supported at each end. As described herein, towel is dispensed from the first roll
3 and then, once the first roll 3 is depleted, from the second roll 5. As such, the
second roll 5 may be considered as a reserve roll of towel. When the dispenser 1 is
serviced, the partially used second roll 5 is generally transferred to the back of
the dispenser 1 and effectively becomes the first roll 3.
[0033] As shown in Figure 2, the support roller assembly 7 is mounted on first and second
side members 33, 35. The support roller assembly 7 comprises a support roller 37 for
supporting towel T to be dispensed, a cutter blade assembly 39, a gear train 41 and
a central axle 43. The support roller 37 has a rubberised outer surface for frictionally
engaging the towel, and is drivingly rotated when a user pulls on the end of the towel
T to extract towel from the dispenser 1 or rotates the knob 25. The cutter blade assembly
39 comprises a pair of transverse cutter blades 45 for cutting at least partway across
the width of the towel T. A cutter blade actuator 47 is provided inside the support
roller 37 for actuating the cutter blades 45.
[0034] The cutter blades 45 are pivotably mounted on pivot pins 49 located in mounting apertures
(not shown) provided in the sidewalls of the support roller 37. The mounting apertures
for the pivot pins 49 are radially inset from the outer surface of the support roller
37. The cutter blades 45 are movable between a retracted position (shown in Figure
2) and an extended position (shown in Figure 3) for cutting the paper towel carried
by the support roller 37. When in said retracted position, the cutter blades 45 are
disposed substantially completely within the support roller 37; and, when in said
extended position, the cutter blades 45 extend substantially radially outwardly and
at least the tips thereof project beyond the circumference of the support roller 37.
One or more stops may be provided to limit the travel of the cutter blades 45, for
example to prevent them pivoting beyond a radial direction when in said extended position.
[0035] Cross-sectional views of the support roller 37 at section A-A of Figure 2 and section
A'-A' of Figure 3 are shown in Figures 4A and 5A respectively. Similarly, cross-sectional
views of the support roller 37 at section B-B of Figure 2 and section B'-B' of Figure
3 are shown in Figures 4B and 5B.
[0036] The cutter blade actuator 47 comprises first and second cams 51, 53 mounted on the
central axle 43; a first cam follower 55 coupled to the cutter blades 45 for following
the first cam 51; and a pivotably mounted retracting member 57 having a second cam
follower 59 for following the second cam 53. The first cam 51 cooperates with the
first cam follower 55 to displace the cutter blades 45 to said extended position,
as shown in Figure 5A. Conversely, the second cam 53 cooperates with the second cam
follower 59 to pivot the retracting member 57 and cause the cutter blades 45 to retract,
as shown in Figure 4B.
[0037] When the central axle 43 is oriented such that the first cam 51 engages the first
cam follower 55, the retracting member 57 locates in a recess provided in the cutter
blade assembly 39 so as not to interfere with the movement of the cutter blades 45,
as shown in Figure 5B. Likewise, when the central axle 43 is oriented such that the
retracting member 57 engages the cutter blade assembly 39 to retract the cutter blades
45, the first cam 51 is offset from the first cam follower 55 so as not to interfere
with the movement of the blades 45, as shown in Figure 4A.
[0038] The central axle 43 is coupled to the support roller 27 via the gear train 41. The
gear train 41 comprises a first gear wheel 59 connected directly to the support roller
37. The first gear wheel 59 meshes with a second gear wheel 61 mounted on a second
axle 63. The first and second gear wheels 59, 61 have a 1:1 gear ratio so that the
support roller 37 and the second axle 63 rotate at the same speed. A third gear wheel
65 is mounted on the second axle 63. The rotation of the second axle 63 drives the
third gear wheel 65 which meshes with a fourth gear wheel 67 mounted on the central
axle 43. The third and fourth gears 65, 67 have a gear ratio of 3:2. Thus, the central
axle 43 completes three revolutions for every two revolutions of the support roller
37.
[0039] A series of annular grooves 69 are provided in the outer surface of the support roller
37. An exit guide 71 comprising a plurality of curved lifting members 73 is provided
below the support roller 37. The lifting members 73 extend into the annular grooves
69 to lift the towel off of the support roller 37 and to guide it out of the dispenser
1.
[0040] A curved supply guide (not shown) may be provided at the rear of the support roller
assembly 7 for guiding towel from the first roll 3 onto the support roller 37. The
supply guide may be located proximal the outer surface of the support roller 37 to
prevent the towel entering the area behind the support roller 37.
[0041] The towel guide assembly 9 comprises a guide roller 75 and a set of three elongate
guide fingers 77. The guide roller 63 defines a curved surface over which the towel
T is drawn as it exits the dispenser 1. The guide fingers 77 are curved to match the
profile of the support roller 37 and, in use, help to retain the towel in contact
with the surface of the support roller 37. Furthermore, the tips of the guide fingers
77 cooperate with the floating plate 13 to bias it towards the support roller 37,
as described in more detail below.
[0042] The front tension plate 11 has four mounting pins 79 which locate in corresponding
mounting apertures 81 provided in the side members 33, 35. The mounting apertures
81 could be elongated to enable the front tension plate 11 to be moved relative to
the support roller 27.
[0043] The floating plate 13 is pivotably mounted at an upper end of the front tension plate
11. The floating plate 13 has a plurality of ribs 83 locatable in the annular grooves
69 provided in the support roller 37. The ribs 83 have a concave introductory portion
to facilitate lifting of the floating plate 13 when an end of the towel is initially
advanced with the support roller 37. When a length of towel is carried by the support
roller 37, the ribs 83 rest on the towel and the floating plate 13 is supported in
a raised position, as shown in Figure 6. When there is no towel on the support roller
37, the ribs 83 locate in the annular grooves 69 and the floating plate 13 is displaced
towards the support roller 37.
[0044] The loading plate assembly 15 comprises a loading plate 85 and a biasing member 87
operable to bias the towel towards the support roller 37. The biasing member 87 is
pivotably mounted; or it could comprise a resilient member or a spring element for
biasing the towel towards the support roller 37. The loading plate 85 is mounted on
the cover 17 of the dispenser 1 and is moved into an operating position when the cover
17 is closed, as shown in Figure 6. The biasing member 87 is pivotably mounted on
the loading plate 85 so as to pivot about an axis substantially parallel to the rotational
axis of the support roller 37. In use, when the cover 17 is in a closed position,
a free end of the biasing member 87 engages the towel T to bias it towards the support
roller 37. Conversely, when the cover 17 is in an open position, the loading plate
assembly 15 is located distal from the support roller 37, as shown in Figure 7.
[0045] The towel T' is initially dispensed from the bottom of the first roll 3 onto the
support roller 37. The ribs 83 of the floating member 13 rest on an upper surface
of the towel T' as it is carried by the support roller 37 and maintain the floating
member 13 and the biasing member 87 in raised positions. The towel T' travels between
the guide fingers 77 and the support roller 37 and over the guide roller 75. The lifting
members 73 of the exit guide 71 lift the towel T' off of the support roller 37 and
ensure that it does not encircle the support roller 37. The lead end of the towel
T' from the first roll 3 extends out of the base of the dispenser 1 a sufficient distance
to enable it to be gripped by a user.
[0046] The second roll 5 is located above the support roller assembly 7 and towel T" is
fed from the bottom of the second roll 5 between the floating member 13 and the towel
loading assembly 15. The lead end of the towel T" from the second roll 5 extends over
the front tension plate 11. When towel T' from the first roll 3 is on the support
roller 37, the floating member 13 and the biasing member 87 are in raised positions
and the towel T" from the second roll 5 is not biased onto the support roller 27.
[0047] To operate the dispenser 1, a user pulls on the lead end of the towel T' supplied
from the first roll 3. The towel T' engages the rubberised surface of the support
roller 37 and causes the support roller 37 to rotate. The rotation of the support
roller 37 rotates the first gear 59 which, via the gear train 41, rotates the central
axle 43. The first cam follower 55 tracks the first cam 51 as the central axle 43
rotates thereby displacing the cutter blades 45 to their extended position each time
the support roller 27 undergoes two complete revolutions (the central axle having
completed three complete revolutions).
[0048] The movement of the cutter blades 45 to the extended position combined with the continued
pulling action of the user on the towel T' causes the towel T' to be cut at least
partially across its width. The cut length of towel T' may be withdrawn from the dispenser
1. A spring may be provided automatically to continue the rotation of the support
roller 27 and expose a length of the towel to be gripped by another user. The rotary
knob 25 is provided for rotating the support roller 27 and manually advancing the
towel. A lever or other drive mechanism could equally be provided for manually rotating
the support roller 27.
[0049] The continued rotation of the central axle 43 causes the second cam 53 to pivot the
retracting member 57 which in turn pivots the cutter blades 45 to their retracted
position.
[0050] The dispensing cycle is repeated until the towel T' on the first roll 3 is depleted,
thereby exposing the annular grooves 69 on the support roller 37. The floating member
13 is biased by the guide fingers 77 towards the support roller 37 and, when the supply
of towel T' is exhausted, the ribs 83 locate in the annular grooves 69. The biasing
member 87 is then allowed to bias the towel T" from the second roll 5 against the
surface of the support roller 37. The support roller 37 is then rotated using the
rotary knob 25 to advance the towel T" from the second roll 5. The towel T" from the
second roll 5 is drawn under the floating member 13 lifting the ribs 83 out of the
annular grooves 69. The guide fingers 77 bias the floating member 13 against the towel
T" thereby ensuring that the towel remains in close contact with the support roller
37. The lead end of the towel T" on the second roll 5 is drawn back between the floating
member 13 and the biasing member 87 and is then dispensed over the exit guide 75.
The towel T" from the second roll 5 may be dispensed in the same manner as described
above for the first roll 3.
[0051] The dispenser 1 is serviced periodically. The cover 17 is unlocked and moved to its
open position thereby displacing the towel loading assembly 15 away from the floating
member 13. Thus, opening the cover 17 displaces the towel loading assembly 15 away
from the support roller 27 and exposes the front tension plate 11 and the floating
member or plate 13.
[0052] If there is towel T" remaining on the second roll 5, the second roll 5 is removed
from the roll carrier arms 27 and moved to the back of the dispenser 1. Thus, the
second roll 5 becomes the first roll 3. Advantageously, the second roll 5 may be moved
to the back of the dispenser 1 without removing the towel T from the support roller
27.
[0053] A new second roll 5 is then mounted on the carrier arms 27. The lead end of the towel
T" from the replacement second roll 5 is placed over the upper surface of the floating
member 3 and positioned over the front tension plate 11, as shown in Figure 7. The
cover 17 may then be returned to its closed position thereby locating the towel loading
assembly 15 above the floating member 13.
[0054] If both the first and second rolls 3, 5 are depleted when the towel dispenser is
serviced, a length of towel from the replacement first roll 3 may be supplied over
the support roller 37 by lifting the floating member 13. This process may be facilitated
by repositioning the front tension plate 11 by moving it away from the support roller
27.
[0055] A second preferred embodiment of the present invention is substantially identical
to the first embodiment, with the exception that the profile of the cutter blades
45 is altered. The second preferred embodiment is illustrated in Figures 8A, 8B, 9A
and 9B which show cross-sectional views equivalent to those illustrated in Figures
4A, 4B, 5A and 5B respectively for the first embodiment. Like reference numerals have
been used to reference like components in the second embodiment.
[0056] The cutter blades 45 of the second embodiment comprise a plurality of tips 46 which
extend, when the cutter blades 45 are in the extended position, at least in part in
a direction opposite to the direction of rotation of the support roller 37 as the
towel T is dispensed. The cutter blades 45 have a curved cross-sectional profile such
that, when actuated, the tips 46 are inclined in a rearwards direction relative to
the direction of rotation of the support roller 37. As such, the distal ends of the
cutter blades 45 face towards the paper towel carried by the support roller 37 as
it is dispensed. This increases the effectiveness of the cutter blades 45 in cutting
the paper towel.
[0057] Figures 8A and 8B show the cutter blades 45 in a retracted position. As for the first
embodiment, when the cutter blades 45 are in the retracted position, the cutter blades
45 are disposed substantially completely within the support roller 37. Conversely,
when in an extended position (as shown in Figures 9A and 9B), the cutter blades 45
extend radially outwardly and at least the tips thereof project beyond the circumference
of the support roller 37.
[0058] The means by which the cutter blades 45 of the second embodiment are actuated are
identical to that in the first embodiment. In particular, a cutter blade actuator
47 is provided which comprises first and second cams 51, 53 mounted on a central axle
43; a first cam follower 55 coupled to the cutter blades 45 for following the first
cam 51; and a pivotally mounted retracting member 57 having a second cam follower
59 for following the second cam 53. These features operate in a manner identical to
that for the first embodiment, enabling the cutter blades 45 to be extended towards
the extended position and retracted towards the retracted position.
[0059] It will be appreciated that various changes and modifications may be made to the
embodiments described herein without departing from the scope of the present invention,
as defined by the appended claims. For example, although the towel loading assembly
15 is mounted directly on the cover 17 in the preferred embodiment, the towel loading
assembly 15 could equally be mounted on support members, such as movable arms, coupled
to the cover 17.
[0060] The coupling of the towel biasing device to the cover of the apparatus could simplify
loading of replacement towel since it could be located over the tension plate and
automatically biased against the support roller when the cover is closed.
[0061] Although the present invention has been described with reference to dispensing paper
towel, it will be appreciated that the apparatus may be used to dispense other sheet
materials.
1. A paper towel dispensing apparatus (1) for dispensing paper towel (T) from a first
roll (3), the apparatus comprising:
a housing having a cover (17);
a rotatable support roller (37) for supporting the towel (T) to be dispensed; and
a towel biasing device coupled to said cover (17), the towel biasing device being
displaced to a first position for biasing towel against the support roller (37) when
the cover (17) is closed; and the towel biasing device being displaced to a second
position for facilitating the loading of towel when the cover (17) is opened;
the apparatus further comprising a towel transfer mechanism for transferring towel
from a second roll (5) onto the support roller (37), the towel biasing device comprising
a towel biasing member (87) pivotable about a first axis substantially parallel to
a rotational axis of the support roller (37), wherein the towel biasing device is
operable to bias towel from the second roll (5) against the support roller (37); and
the towel transfer mechanism comprising a floating member (13) for cooperating with
the towel (T) from the first roll (3) to control the towel biasing device;
characterised in that a pathway is provided between the floating member (13) and the towel biasing device
for receiving towel from the second roll (5) ready for transfer onto the support roller
(37) when the towel from the first roll (3) is depleted.
2. A paper towel dispensing apparatus (1) as claimed in claim 1, wherein the towel biasing
device is mounted on the cover (17).
3. A paper towel dispensing apparatus (1) as claimed in claim 1 or claim 2, wherein the
towel biasing device comprises an elongate member (87) for biasing the towel against
the support roller (37).
4. A paper towel dispensing apparatus (1) as claimed in claim 1, 2 or 3, wherein a first
side of the floating member (13) is provided with at least one projection for engaging
the towel from the first roll (3), the at least one projection being locatable in
at least one corresponding recess in the support roller (37) when the towel from the
first roll (3) is depleted.
5. A paper towel dispensing apparatus (1) as claimed in claim 4, wherein the floating
member (13) has a second side for supporting the towel from the second roll (5).
6. A paper towel dispensing apparatus (1) as claimed in any one of the preceding claims,
wherein the floating member (13) is pivotably mounted.
7. A paper towel dispensing apparatus (1) as claimed in claim 6, wherein the floating
member (13) is pivotable about a second axis substantially parallel to the rotational
axis of the support roller (37).
8. A paper towel dispensing apparatus (1) as claimed in any one of the preceding claims,
wherein the towel biasing device further comprises a tensioning arm.
9. A paper towel dispensing apparatus (1) as claimed in any one of the preceding claims
further comprising a cutter blade for cutting the towel (T) from said first and second
rolls (3, 5).
10. A paper towel dispensing apparatus (1) as claimed in claim 9, wherein said cutter
blade is mounted on the support roller (37).
11. A paper towel dispensing apparatus (1) as claimed in claim 10, wherein said cutter
blade (45) is retractable at least substantially into an interior of the support roller
(37).
12. A paper towel dispensing apparatus (1) as claimed in claim 9, 10 or 11, wherein said
cutter blade (45) is actuated each time the support roller (37) completes a predetermined
number of revolutions.
13. A paper towel dispensing apparatus (1) according to any one of claims 9 to 12, wherein
the cutter blade (45) comprises a tip which extends, when the cutter blade (45) is
in a cutting position, at least in part in a direction opposite to a direction of
rotation of the support roller (37) when the towel (T) is dispensed.
14. A paper towel dispensing apparatus (1) according to claim 13, wherein the tip is formed
by a curved section (31) of the cutter blade (45).
15. A method of servicing a paper towel dispensing apparatus (1) as claimed in any one
of the preceding claims, the method comprising the steps of:
(a) moving the cover (17) to an open position and thereby displacing the towel biasing
device to said second position displaced from the support roller (37);
(b) loading the towel dispensing apparatus (1) with a first roll (3) of towel (T)
and/or a second roll (5) of towel (T);
(c) positioning a lead end of the towel to be dispensed over the rotatable support
roller (37); and
(d) moving the cover (17) to a closed position and thereby returning the towel biasing
device to said first position proximal the support roller (37).
1. Papiertuchausgabevorrichtung (1) zum Ausgeben eines Papiertuchs (T) von einer ersten
Rolle (3), wobei die Vorrichtung aufweist:
ein Gehäuse mit einer Abdeckung (17);
eine drehbare Tragwalze (37) zum Tragen des Tuchs (T), das auszugeben ist; und
eine Tuchvorspannvorrichtung, die mit der Abdeckung (17) verbunden ist, wobei die
Tuchvorspannvorrichtung an eine erste Position verschoben wird, um das Tuch gegen
die Tragwalze (37) vorzuspannen, wenn die Abdeckung (17) geschlossen ist; und wobei
die Tuchvorspannvorrichtung an eine zweite Position verschoben wird, um das Laden
des Tuchs zu erleichtern, wenn die Abdeckung (17) geöffnet ist;
wobei die Vorrichtung ferner einen Tuchübertragungsmechanismus aufweist, um das Tuch
von einer zweiten Rolle (5) auf die Tragwalze (37) zu übertragen, wobei die Tuchspannvorrichtung
ein Tuchvorspannelement (87) aufweist, das um eine erste Achse geschwenkt werden kann,
die im Wesentlichen parallel zu einer Drehachse der Tragwalze (37) ist, wobei die
Tuchvorspannvorrichtung dazu dient, das Tuch von der zweiten Rolle (5) gegen die Tragwalze
(37) vorzuspannen; und
wobei der Tuchübertragungsmechanismus ein gleitendes Element (13) aufweist, um mit
dem Tuch (T) ab der ersten Rolle (3) zusammenzuwirken, um die Tuchvorspannvorrichtung
zu steuern;
dadurch gekennzeichnet, dass sich ein Pfad zwischen dem gleitenden Element (13) und der Tuchvorspannvorrichtung
befindet, um ein Tuch von der zweiten Rolle (5) zu empfangen, das für die Übertragung
auf die Tragwalze (37) bereit ist, wenn das Tuch der ersten Rolle (3) aufgebraucht
ist.
2. Papiertuchausgabevorrichtung (1) nach Anspruch 1, wobei die Tuchvorspannvorrichtung
auf der Abdeckung (17) befestigt ist.
3. Papiertuchausgabevorrichtung (1) nach Anspruch 1 oder 2, wobei die Tuchvorspannvorrichtung
ein Verlängerungselement (87) aufweist, um das Tuch gegen die Tragwalze (37) vorzuspannen.
4. Papiertuchausgabevorrichtung (1) nach Anspruch 1, 2 oder 3, wobei eine erste Seite
des gleitenden Elements (13) mit zumindest einem Vorsprung versehen ist, um das Tuch
von der ersten Rolle (3) einzurasten, wobei sich der zumindest eine Vorsprung in zumindest
einer entsprechenden Vertiefung in der Tragwalze (37) befinden kann, wenn das Tuch
der ersten Rolle (3) aufgebraucht ist.
5. Papiertuchausgabevorrichtung (1) nach Anspruch 4, wobei das gleitende Element (13)
eine zweite Seite aufweist, um das Tuch von der zweiten Rolle (5) zu tragen.
6. Papiertuchausgabevorrichtung (1) nach einem der vorgenannten Ansprüche, wobei das
gleitende Element (13) schwenkbar befestigt ist.
7. Papiertuchausgabevorrichtung (1) nach Anspruch 6, wobei das gleitende Element (13)
um eine zweite Achse geschwenkt werden kann, die im Wesentlichen zu der Drehachse
der Tragwalze (37) parallel ist.
8. Papiertuchausgabevorrichtung (1) nach einem der vorgenannten Ansprüche, wobei die
Tuchvorspannvorrichtung ferner einen Verspannungsarm aufweist.
9. Papiertuchausgabevorrichtung (1) nach einem der vorgenannten Ansprüche, ferner aufweisend
eine Schneidklinge zum Schneiden des Tuchs (T) der ersten und zweiten Rollen (3, 5).
10. Papiertuchausgabevorrichtung (1) nach Anspruch 9, wobei die Schneidklinge auf der
Tragwalze (37) befestigt ist.
11. Papiertuchausgabevorrichtung (1) nach Anspruch 10, wobei die Schneidklinge (45) zumindest
größtenteils in ein Inneres der Tragwalze (37) zurückziehbar ist.
12. Papiertuchausgabevorrichtung (1) nach Anspruch 9, 10 oder 11, wobei die Schneidklinge
(45) jedes Mal betätigt wird, wenn die Tragwalze (37) eine vorgegebene Anzahl von
Umdrehungen vollführt hat.
13. Papiertuchausgabevorrichtung (1) nach einem der Ansprüche 9 bis 12, wobei die Schneidklinge
(45) eine Spitze aufweist, die, wenn sich die Schneidklinge (45) in einer Schneideposition
befindet, zumindest teilweise in eine Richtung verläuft, die einer Drehrichtung der
Tragwalze (37), wenn das Tuch (T) ausgegeben wird, entspricht.
14. Papiertuchausgabevorrichtung (1) nach Anspruch 13, wobei die Spitze durch einen gebogenen
Abschnitt (31) der Schneidklinge (45) gebildet wird.
15. Verfahren zum Warten einer Papiertuchausgabevorrichtung (1) nach einem der vorgenannten
Ansprüche, wobei das Verfahren die folgenden Schritte aufweist:
(a) Bewegen der Abdeckung (17) auf eine geöffnete Position und dadurch Verschieben
der Tuchvorspannvorrichtung auf die zweite Position, die von der Tragwalze (37) verschoben
ist;
(b) Beladen der Tuchausgabevorrichtung (1) mit einer ersten Rolle (3) des Tuchs (T)
und/oder einer zweiten Rolle (5) des Tuchs (T);
(c) Positionieren eines Anfangsstücks des auszugebenden Tuchs über der drehbaren Tragwalze
(37); und
(d) Bewegen der Abdeckung (17) auf eine geschlossene Position und dadurch Rückkehr
der Tuchausgabevorrichtung auf die erste Position in der Nähe der Tragwalze (37).
1. Appareil de distribution de serviette en papier (1) pour distribuer une serviette
en papier (T) à partir d'un premier rouleau (3), l'appareil comprenant :
un boîtier ayant un couvercle (17) ;
un rouleau de support rotatif (37) pour supporter la serviette (T) à distribuer ;
et
un dispositif de sollicitation de serviette couplé audit couvercle (17), le dispositif
de sollicitation de serviette étant déplacé dans une première position pour solliciter
la serviette contre le rouleau de support (37) lorsque le couvercle (17) est fermé
; et le dispositif de sollicitation de serviette étant déplacé dans une seconde position
pour faciliter le chargement de la serviette lorsque le couvercle (17) est ouvert
;
l'appareil comprenant en outre un mécanisme de transfert de serviette pour transférer
la serviette du second rouleau (5) sur le rouleau de support (37), le dispositif de
sollicitation de serviette comprenant un élément de sollicitation de serviette (87)
pouvant pivoter autour d'un premier axe sensiblement parallèle à un axe de rotation
du rouleau de support (37), dans lequel le dispositif de sollicitation de serviette
peut fonctionner pour solliciter la serviette du second rouleau (5) contre le rouleau
de support (37) ; et
un mécanisme de transfert de serviette comprenant un élément flottant (13) pour coopérer
avec la serviette (T) du premier rouleau (3) afin de commander le dispositif de sollicitation
de serviette ;
caractérisé en ce qu'une voie de passage est prévue entre l'élément flottant (13) et le dispositif de sollicitation
de serviette pour recevoir la serviette du second rouleau (5) prête pour le transfert
sur le rouleau de support (37) lorsque la serviette du premier rouleau (3) est épuisée.
2. Appareil de distribution de serviette en papier (1) selon la revendication 1, dans
lequel le dispositif de sollicitation de serviette est monté sur le couvercle (17).
3. Appareil de distribution de serviette en papier (1) selon la revendication 1 ou la
revendication 2, dans lequel le dispositif de sollicitation de serviette comprend
un élément allongé (87) pour solliciter la serviette contre le rouleau de support
(37).
4. Appareil de distribution de serviette en papier (1) selon la revendication 1, 2 ou
3, dans lequel un premier côté de l'élément flottant (13) est prévu avec au moins
une saillie pour mettre en prise la serviette du premier rouleau (3), la au moins
une saillie pouvant être positionnée dans au moins un évidement correspondant dans
le rouleau de support (37) lorsque la serviette du premier rouleau (3) est épuisée.
5. Appareil de distribution de serviette en papier (1) selon la revendication 4, dans
lequel l'élément flottant (13) a un second côté pour supporter la serviette du second
rouleau (5).
6. Appareil de distribution de serviette en papier (1) selon l'une quelconque des revendications
précédentes, dans lequel l'élément flottant (13) est monté de manière pivotante.
7. Appareil de distribution de serviette en papier (1) selon la revendication 6, dans
lequel l'élément flottant (13) peut pivoter autour d'un second axe sensiblement parallèle
à l'axe de rotation du rouleau de support (37).
8. Appareil de distribution de serviette en papier (1) selon l'une quelconque des revendications
précédentes, dans lequel le dispositif de sollicitation de serviette comprend en outre
un bras de tension.
9. Appareil de distribution de serviette en papier (1) selon l'une quelconque des revendications
précédentes, comprenant en outre une lame de dispositif de coupe pour couper la serviette
(T) desdits premier et second rouleaux (3, 5).
10. Appareil de distribution de serviette en papier (1) selon la revendication 9, dans
lequel ladite lame de dispositif de coupe est montée sur le rouleau de support (37).
11. Appareil de distribution de serviette en papier (1) selon la revendication 10, dans
lequel ladite lame de dispositif de coupe (45) est rétractable au moins sensiblement
dans un intérieur du rouleau de support (37).
12. Appareil de distribution de serviette en papier (1) selon la revendication 9, 10 ou
11, dans lequel ladite lame de dispositif de coupe (45) est actionnée chaque fois
que le rouleau de support (37) termine un nombre de révolutions prédéterminé.
13. Appareil de distribution de serviette en papier (1) selon l'une quelconque des revendications
9 à 12, dans lequel la lame de dispositif de coupe (45) comprend une pointe qui s'étend,
lorsque la lame de dispositif de coupe (45) est dans une position de coupe, au moins
en partie dans une direction opposée à une direction de rotation du rouleau de support
(37) lorsque la serviette (T) est distribuée.
14. Appareil de distribution de serviette en papier (1) selon la revendication 13, dans
lequel la pointe est formée par une section incurvée (31) de la lame de dispositif
de coupe (45).
15. Procédé pour se servir d'un appareil de distribution de serviette en papier (1) selon
l'une quelconque des revendications précédentes, le procédé comprenant les étapes
consistant à :
(a) déplacer le couvercle (17) dans une position ouverte et déplacer ainsi le dispositif
de sollicitation de serviette dans ladite seconde position déplacée par rapport au
rouleau de support (37) ;
(b) charger l'appareil de distribution de serviette (1) avec un premier rouleau (3)
de serviette (T) et/ou un second rouleau (5) de serviette (T) ;
(c) positionner une extrémité d'attaque de la serviette à distribuer sur le rouleau
de support (37) rotatif ; et
(d) déplacer le couvercle (17) dans une position fermée et ramener ainsi le dispositif
de sollicitation de serviette dans ladite première position à proximité du rouleau
de support (37).