EP2846669B1

EP2846669B1 - Paper sheet material dispenser apparatus

Info

Publication number: EP2846669B1
Application number: EP13787941.7A
Authority: EP
Inventors: Joel P. Keily; Niko Anthony Cvjetkovic
Original assignee: Dispensing Dynamics International LLC
Current assignee: Dispensing Dynamics International LLC
Priority date: 2012-05-08
Filing date: 2013-04-15
Publication date: 2018-11-07
Anticipated expiration: 2033-04-15
Also published as: EP2846669A1; MX2014013338A; WO2013169438A1; BR112014027731B1; BR112014027731A2; EP2846669A4; MX370885B

Description

TECHNICAL FIELD

This invention relates to apparatus for dispensing paper toweling or other paper sheet material from a roll. More particularly, the dispenser apparatus incorporates an electric motor for facilitating dispensing of the toweling or other paper sheet material.

BACKGROUND OF THE INVENTION

Many dispenser systems are known in the prior art for dispensing paper toweling from rolls thereof. In some cases, the paper toweling is comprised of individual paper towel segments separated by perforated tear lines, and in others the toweling has no perforated tear lines formed therein, severing or cutting individual sheets from the toweling accomplished by some suitable severing structure incorporated in the dispenser.
Many towel dispensers of a purely mechanical nature have been developed and utilized over the years for dispensing paper towels, including dispensers which are actuated by a user grasping and pulling on a tail of the toweling extending from the dispenser housing.
For example, U.S. Patents Nos. 6,314,850 and 6, 553 879 disclose apparatus for dispensing paper toweling including a rotatable toweling support roller and a cutter blade pivotally mounted on the outer peripheral portion of the roller. The blade is movable between a first position in which the cutting edge of the blade is positioned closely adjacent to the outer peripheral portion and a second position in which the blade is disposed at an angle relative to the outer peripheral portion with the cutting edge of the blade spaced from the toweling support roller.
The cutter blade when in the second position projects in a direction generally opposed to the direction of rotation of the toweling support roller. Pulling force exerted on the toweling by a user not only serves to rotate the toweling support roller but also cause the toweling to bear against the cutting edge of the cutter blade to sever the toweling.
The apparatus of U.S. Patents Nos. 6,314,850 and 6,553,879 has met with considerable commercial success; however, some problems with "tabbing" have occurred during use of the dispenser. Tabbing occurs when a piece of towel tears from the sheet when a user grasps and pulls the paper Tabbing may occur with one or two hand pulls. Papers that absorb water at the greatest rate are most likely to tab, the rate of water absorbency varying by paper manufacturer and grade. Tabbing also becomes a particular problem when low basis weight paper is to be dispensed. It is not an exaggeration to say that virtually all paper towel dispensers of a purely mechanical nature which rely on direct pulling of the toweling by a user to transport the toweling and actuate moveable cutter or severing blades have a tabbing problem to some extent.
Electro-mechanical dispensers employing an electric motor to transport toweling and actuate cutter mechanisms are also well known. Such arrangements include both dispensers which are manually actuated, as by means of a push button and those employing a sensor, such as a sensor sensing proximity of a user's hand, to initiate operation.
U.S. Patent No. 6,820,785, issued November 23, 2004 , discloses an electro-mechanical roll towel dispenser including a housing with a roll carrier disposed therein to rotationally support a roll of towel material. An electromechanical feed mechanism is disposed in the housing to dispense measured sheets of the towel material. The feed mechanism operates in a first mechanical operational mode wherein the towel sheets are dispensed by a user grasping and pulling on a tail of the towel material extending from the housing, and a second electrical operational mode wherein a measured length of a next sheet is automatically fed from the housing to define the tail for the next user.
The dispenser of U.S. Patent No. 6,820,785 includes a sensor for detecting a parameter that is changed by an initial pull exerted on a tail of a web of material extending from the opening of the dispenser. The sensor also generates a signal sent from the sensor to a control circuit or circuitry causing the motor employed in the apparatus to drive the feed mechanism until a measured length of web material that includes the tail of web material has been fed from the dispenser in the form of a measured sheet for subsequent removal by the user.
Similar devices are disclosed in U.S. Patent No. 3,730,409 and Patent Publication Document WO 00/63100 . The devices of these latter two documents have sensors for detecting movement of a tail end of web material such that the feed mechanism is activated in response to detecting the movement.
U.S. Patent No. 8,082,827, issued December 27, 2011 , discloses a towel dispenser which incorporates a oneway rotational coupling enabling the dispenser to be operated by motor or in a manual dispensing mode separately from the motor.
U.S. Patent No. 7,987,756, issued August 2, 2011 , discloses a dispenser for paper toweling which incorporates a cutter blade within an actuator roller carrying paper toweling. A drive motor is activated to drive the actuator roller during the time the cutter blade is extended to cut the paper toweling and deactivated when the cutter blade is retracted.
WO 2011/100056 A1 of the inventors of the present application discloses a paper sheet material dispenser according to the preamble of claim 1, i.e. a toweling dispenser in which an electric motor driven toweling support roller and a handle for rotating the toweling support roller are connected by a one-way clutch, which allows the handle to rotate the toweling support roller only in a single direction of rotation when the electric motor does not drive the toweling support roller, the single direction transporting toweling on the toweling support roller to an exit opening of the dispenser.

DISCLOSURE OF INVENTION

The present invention relates to a paper toweling dispenser apparatus according to claim 1, which is electro-mechanical in nature to provide electric motor assisted dispensing and which is relatively simple, inexpensive and reliable.
The apparatus lowers the consumption of electrical energy required for operation, thus prolonging battery life.
The apparatus provides consistent tail length externally of the housing thereof for manual grasping and pulling by a user.
The motor eliminates the need for toweling support roller return springs, an expedient employed in U.S. Patent No. 6,314,850 , for example, to return the toweling support roller to an initial or rest position wherein a new toweling tail extends from the housing of the apparatus for access by the next user, providing a reduction of required pull force and consequent tabbing. In the arrangement of 6,314,850 , springs must be tensioned during initial rotation of the toweling by manually pulling the toweling. This requires higher pulling forces, increasing the likelihood of tabbing.
Activation and deactivation of the electric motor is accomplished by means of a simple switch, thus no circuit board or complicated sensor/control circuitry is required.
The paper toweling dispenser apparatus of the present invention includes a roll support for rotatably supporting a roll of paper toweling having a tail and a housing defining an opening.
A rotatable toweling support roller is spaced from the roll support for receiving paper toweling from the roll of paper toweling, the toweling support roller having a cylindrically-shaped outer peripheral surface.
An electric motor is operatively associated with the toweling support roller for selectively rotating the toweling support roller.
The apparatus also includes an electric switch operatively associated with the electric motor and with the toweling support roller. The electric switch is responsive to rotation of the toweling support roller caused by a user of the paper towel dispenser apparatus pulling on the paper toweling tail projecting through the opening and extending outwardly from the housing to a first position to energize the electric motor when the toweling support roller reaches the first position and cause rotation of the rotatable toweling support roller by the electric motor from the first position to a second position.
A cutter blade is provided for substantially or completely severing the paper on the toweling support roller during rotation thereof caused solely by the user pulling on the paper toweling tail and without energization and use of the electric motor before the toweling support roller reaches the first position.
The electric switch is responsive to rotation of said toweling support roller by the energized electric motor to the second position to de-energize the electric motor and present a new tail projecting through the opening and extending outwardly from the housing.
Other features, advantages and objects of the present invention will become apparent with reference to the following description and accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS

Fig 1 is a perspective view of apparatus constructed in accordance with the teachings of the present invention, the outer cabinet having been removed;
Fig. 2 is a view similar to Fig. 1, but illustrating a battery cover removed to illustrate batteries, and a finger guide plate pivoted from its normal position shown in Fig. 1 wherein it partially surrounds and covers the toweling support roller;
Fig. 3 is an enlarged, perspective view illustrating a motor driven drive gear with the teeth thereof meshing with teeth of a circular toweling support roller gear, only a portion of the latter being illustrated;
Fig. 4 is a side, elevational view of the apparatus and showing in dash lines relative placement of a cam follower of blade actuator structure of the invention positioned relative to a channel of a cam during a stage of operation wherein an electric motor is utilized to rotate the toweling support roller;
Fig. 5 is a diagrammatic presentation illustrating the condition of structural elements of the apparatus at the point of operation where a user has grasped the tail of toweling and initiates pulling;
Fig. 6 illustrates the condition of structural components when pulling is initiated by the hand of a user grasping the toweling tail during the stage of operation shown in Fig. 5;
Fig. 7 is a view similar to Fig. 5, but illustrating a stage of operation of the apparatus wherein a cutter blade is in severing position and the electric motor is energized to reduce the pulling forces required by the user;
Fig. 8 is a view similar to Fig. 6, but illustrating the condition of structural components in the stage of operation of Fig, 7;
Fig. 9 is a view similar to Figs. 5 and 7, but showing the endmost sheet of toweling having been severed by the blade and the electric motor still operating to rotate the toweling support roller;
Fig. 10 is a view similar to Figs. 6 and 8 showing the condition of the structural elements of the apparatus in the stage of operation of Fig. 9,
Fig. 11 is a view similar to Figs. 5, 7 and 9 illustrating the toweling support roller further rotated, the motor de-energized, and a new tail end in the process of being presented to be grasped by a user;
Fig. 12 is a view similar to Figs. 6, 8 and 10 showing the condition of the structural elements of the apparatus in the stage of operation illustrated in Fig. 11, the electric motor having been de-energized and momentum in the process of returning the toweling support roller to its initial or rest position;
the embodiment of Figures 4 - 12 is indicated as an embodiment of a dispenser that does not form part of the invention but which is useful for understanding the invention;
Fig. 13 is a flow chart illustrating operation of a first embodiment of the invention;
Figs. 14 - 17 are views similar to Figs. 9 -12, but illustrating the condition of structural components of the first embodiment in sequential stages of operation; and
Fig, 18 is a flow chart illustrating operation of a second embodiment of the invention.

MODES FOR CARRYING OUT THE IWENTION

Referring now to Figs. 1 - 12 of the drawings, a paper sheet material dispenser apparatus is illustrated, the apparatus for dispensing sheet material in the form of paper toweling from a roll of paper toweling R.
The apparatus includes a housing 10 which is suitably positioned in an outer paper towel dispenser cabinet (not shown) and secured thereto by any suitable expedient such as screws or other suitable mechanical fasteners.
A roll support is operatively associated with the housing 10 to rotatably support a roll of paper toweling R (Fig. 4) in a conventional fashion Toweling 12 from the roll is shown in Figs. 4, 5, 7, 9 and 11 and identified by reference numeral 12. As is conventional, the disclosed roll support includes two double-ended arms 14, 16 spaced from one another and roll engagement members 18 at the distal or upper ends of the arms for entering the ends of the roll.
A rotatable toweling support roller 22 is rotatably mounted within the housing 10 for receiving toweling 12 and supporting and transporting the toweling. The rotatable toweling support roller 22 has a cylindrically-shaped outer peripheral surface and is rotatable in a predetermined direction of rotation when pulling forces are applied to the toweling supported thereby. Stub shafts project from the ends of the toweling support roller and in turn are supported by the housing. A cutter blade 26 is pivotally connected to the toweling support roller. Cutter blade 26 has attached to the ends thereof cam followers 30, each including a cam follower arm 32 and a roller 34. Each roller 34 rides in a channel 36 of a cam 38. Cams 38 are located at both ends of the housing, it being understood that the channels 36 of these cams are directed inwardly.
Rotation of toweling support roller 22 will cause the cam followers to move along the cam surfaces defining channels 36. This, in turn, will cause the cutter blade 26 to pivot relative to the toweling support roller 22.
The cutter blade is movable between an inactive position (shown in Fig. 5) wherein the cutter will not sever the toweling and a severing position (see Fig. 7) wherein the cutting edge of the cutter blade is positioned outwardly of the toweling support roller to at least partially sever the toweling on the toweling support roller, an operation which will be described below.
The dispenser apparatus structure described thus far is essentially that disclosed in U.S. Patents Nos. 6,314,850 and 6,553,879 . As disclosed in those patents, the cutter blade when in its inactive or first position lies substantially flat against the toweling support roller with the cutting edge positioned closely adjacent to the cylindrically-shaped outer peripheral surface and a severing or second position wherein the cutting edge of the blade is positioned outwardly of the toweling support roller and disposed at an angle relative to the outer peripheral surface thereof. The cutter blade when in the second position, projects from the pivot in a direction generally opposed to the direction of rotation of the toweling support roller.
In the paper toweling dispenser apparatus disclosed and claimed herein, an electric motor 40 is operatively associated with the toweling support roller to selectively rotate the toweling support roller.
In addition, an electric switch 42 is operatively associated with the electric motor and with the toweling support roller. The electric switch is electrically connected to the electric motor, with no control circuit boards intermediate the electric motor and the electric switch.
The electric switch 42 is responsive to rotation of the toweling support roller 22 by a user of the paper towel dispenser from a rest or inactive position to a first position to energize the electric motor when the toweling support roller reaches the first position and cause rotation of the toweling support roller by the electric motor from the first position to a second position and reducing the pull force required by a user pulling the paper toweling during rotation of the toweling support roller between the first position and the second position.
Further, the electric switch is responsive to rotation of the toweling support roller beyond the second position to de-energize the electric motor. This operation is described in more detail below.
Electric switch 42 includes a switch actuator element 44 having a roller 46 at the end thereof which is biased into engagement with a circular end 48 of the toweling support roller 22. The switch actuator element alternatively opens or closes the switch during rotation of the toweling support roller.
Located at circular end 48 of the toweling support roller and engaged by the switch actuator element roller during rotation of the toweling support roller is an arcuate projection 50. The projection extends only part way along the periphery of the toweling support roller and has two tapered projection ends 52.
Extending completely about circular end 48 and disposed inwardly of the arcuate projection, is a toweling support roller gear 54 having teeth. Meshing with the teeth of the toweling support roller gear are teeth of a drive gear 56 which is driven by electric motor 40, the latter suitably being in the form of a DC gear motor, A one-way clutch needle bearing 58 connects the drive gear to the electric motor to allow the performance of certain functions indicated below. Electric wiring 60 connects the switch 42 to the electric motor. The electric switch is located between the electric motor and a source of DC power in the form of electric batteries 62 (see Fig. 2). In the interest of simplicity, the conventional wiring extending between the switch and the batteries is not illustrated. The batteries are normally covered by a cover plate 64 readily snapped into or out of position as depicted in Figs. 1 and 2.
Figs. 5 through 12 provide an illustration of the operation of the dispenser apparatus, including a dash line illustration in Figs. 5, 7, 9 and 11 of the location of the blade and follower during consecutive stages in the operation of the apparatus.
The embodiment of Figures 4 - 12 is indicated as an embodiment of a dispenser that does not form part of the invention but which is useful for understanding the invention.
Figs. 5 and 6 illustrate the condition of the various components when pulling of toweling 12 by a user begins.
The toweling tail may be brought to the position illustrated in Fig. 5 by manually rotating the toweling dispenser roller 22 by a rotatable manually engageable element in the form of a handle or knob 68 connected to the toweling support roller. A one-way clutch (not shown) may be employed to ensure that the toweling support roller is being rotated in a direction to advance the toweling. The handle 68 can also be used to advance and dispense the toweling if the batteries fail. The user can pull on the tail as usual when not utilizing the apparatus in motor assisted mode. In this non-motor-driven mode, the required pull force is still relatively low since the gear motor is in effect disengaged from the toweling support roller by employing the one-way clutch needle bearing 58 or some other suitable one-way clutch mechanism.
Continued pulling of the toweling tail results in the condition illustrated in Figures 7 and 8. The switch 42 is closed since the switch actuator element 44 engages projection 50. Thus, the motor is energized and drives the toweling support roller gear and drive gear as shown by the arrows in Figure 8. This results in significant reduction in the pulling force that would otherwise be required by the user pulling the toweling tail, greatly reducing the problem of tabbing. It will be appreciated that the motor is energized when the pulling forces necessary would otherwise be at their greatest, since the cutting blade is being moved into its severing position as shown in Fig. 7.
Figs. 9 and 10 show the condition of the structural components when an individual towel has been severed from the toweling and a new tail end is in the process of being presented to the user. In the arrangement illustrated, and as disclosed in U.S. Patent Nos. 6,314,850 and 6,553,879 , severing is accomplished by the user pulling on the tail when the blade is at the angled position represented in Fig. 7. As indicated in Fig. 10, after severing, the motor will continue to rotate the toweling support roller to advance the next tail. This continues until the structural elements reach the condition shown in Figs, 11 and 12 wherein the switch is opened to de-energize the electric motor during or after passage of the rearmost tapered end of the projection 50 past the switch. Fig. 3 shows the switch actuator element 44 just prior to passage of the rearmost projection end 52. The tapered projection ends facilitate engagement with the arcuate projection and disengagement there from. After de-energization, the momentum of the toweling support roller will bring it back to its initial inactive or rest position until the newly presented tail is pulled to again begin dispensing. The one-way clutch employed in the drive gear 56 results in the de-energized electric motor not impeding this final movement of the toweling support roller.
The toweling dispenser apparatus includes another feature which also reduces likelihood of tabbing. A shock reducing element in the form of a freely rotatable roller 70 mounted for up and down movement within slots formed in opposed sides the housing is located in the path of the paper toweling extending between the toweling support roller and the roll support. If slack exists in the toweling, as illustrated for example in Fig. 5, pulling and consequent tautening of the toweling will cause the roller 70 to move upwardly as shown in Fig. 7. This reduces pulling forces at the tail distal end which might otherwise occur as a result from the shock resulting from taking up of the slack during pulling.
A curved plate 80 having curved pressure fingers 82 is pivotally attached to housing 10 and is movable between an open position (Fig. 2) and a closed position (Fig. 1). When in the closed position, the fingers are used to exert a downward force on the toweling on toweling support roller 22 to facilitate cutting of the toweling.
If complete cutting or severing of a sheet from the toweling is desired without the user pulling on the sheet to tension it against the blade, a finger or fingers may be designed to hold the paper toweling in firm engagement with the surface of the toweling support roller.
By changing the configuration of the projection 50, the lengths of the tails projecting from the dispenser can be changed. Also, actual total sheet length can be changed by employing toweling support rollers of different drum diameters.
Figs. 13 - 17 relate to a first embodiment of the invention. In this embodiment of the invention, a tail is present and projecting from the dispenser which is grasped by the user to begin dispensing, as was the case with the previously described embodiment. However, in this embodiment the electric motor is not energized until a sheet is substantially or completely severed by the cutter blade. After severing of the sheet, as shown in Fig. 9, the switch 42 is closed and the tail of the remainder of the paper toweling extends through an opening in the housing of the paper towel dispenser apparatus and extends downward therefrom for grasping by the next user.
The Figures 14 - 17 conform to the Figures 9 -12 relating to the embodiment not incorporating the invention and the structural components are the same except for one difference. In the Fig. 13 - 17 embodiment of the invention the projection 50 has been substantially shortened so that it is engaged with the switch to close the switch only for a shorter duration but one sufficient to complete rotation of the rotatable toweling support roller to the position shown in Fig. 11 wherein the new tail projects through the housing opening and extends outwardly from the housing a desired predetermined distance. The life of a battery electrical source employed with the dispenser will be sufficiently prolonged utilizing this approach. Of course disengagement between the switch and the projection at this stage will immediately result in termination of rotation of the toweling support roller.
Fig. 18 is a flow chart which illustrates the operation of a second embodiment which is a more advanced version of the first embodiment. In this more advanced version a logic control L functions as a motor control structure operatively associated with the electric motor and the electric switch for preventing energization of the electric motor to rotate the toweling support roller if the momentum of the toweling support roller caused by a user's pull has been sufficient to place a new tail so that a predetermined adequate length thereof extends outwardly from the housing.
Logic is used to determine if an adequate tail is present. This can be done by incorporating a switch or a sensor in the motor control structure. If an adequate tail is present, the motor does not turn on. If an adequate tail isn't present, the motor will turn on until the drum rotates to a switch point that turns off the motor. In addition to prolonging battery life, a consistent tail length is produced and there is less tabbing than when return springs are utilized for this purpose. Drum return springs add to the amount of pull force required to dispense a sheet of toweling.
Sometimes, in practice, users tear a sheet by pulling sideways instead of downward, in which case the toweling support roller may only rotate slightly, if at all. Logic by means of a sensor can detect if paper is present at the paper exit, and energize the motor to rotate one complete cycle, in effect resetting the dispenser for the next user.
The principles of the invention are applicable to paper sheet material other than paper toweling.

Claims

Paper sheet material dispenser apparatus for dispensing paper sheet material (12) from a roll of paper sheet material (12) having a tail, said apparatus comprising, in combination:
a housing (10) defining an opening;

a roll support (14, 16) within said housing (10) for rotatably supporting the roll of paper sheet material (12);

a rotatable sheet material support roller (22) for receiving paper sheet material (12) from the roll of paper sheet material (12), said sheet material support roller (22) having a cylindrically-shaped outer peripheral surface;

an electric motor (40) operatively associated with said sheet material support roller (22) for selectively rotating said sheet material support roller (22);

an electric switch (42) operatively associated with said electric motor (40) and with said sheet material support roller (22), said electric switch (42) responsive to rotation of said sheet material support roller (22) caused by a user of the paper sheet material dispenser apparatus pulling on the paper sheet material (22) tail when the paper sheet material (12) is projecting through said opening and the paper sheet material (12) tail extends outwardly from said housing (10) to a first position to energize said electric motor (40) when the sheet material support roller (22) reaches said first position and cause rotation of said sheet material support roller (22) by said electric motor (40) from said first position to a second position, said electric switch (42) including a switch actuator element (44) engageable with an arcuate projection (50) on said sheet material support roller (22) and rotatable with said sheet material support roller (22) to alternatively open or close said electric switch (42) during rotation of said sheet material support roller (22); and

a cutter blade (26) pivotally connected to said sheet material support roller (22) for substantially or completely severing the paper sheet material (12) on said sheet material support roller (22) during rotation thereof, the apparatus characterized by said switch actuator element (44) and the arcuate projection (50) on said sheet material support roller (22) being configured for energizing said electrical motor (44) and causing rotation of said sheet material support roller (22) by said electric motor (44) only after severing of said paper sheet material (12) by the cutter blade (26) and the paper sheet material (12) is at said first position caused by the user pulling on the paper sheet material (12) tail without energization and use of said electric motor (44), and said electric switch (42) being responsive to rotation of said sheet material support roller (22) by said energized electric motor to said second position from said first position to de-energize said electric motor and present a new tail projecting through said opening and extending outwardly a desired predetermined distance from said housing (10).
The paper sheet material apparatus according to Claim 1 wherein said cutter blade (26) is pivotally mounted on said blade actuator structure (30, 32, 34, 36, 38) for moving said cutter blade (26) during rotation of said sheet material support roller (22) to sever paper sheet material (12) on said sheet material support roller (22) during rotation of said sheet material support roller (22) before said sheet material support roller (22) reaches said first position.
The paper sheet material dispenser apparatus according to Claim 2 wherein said blade actuator structure (30, 32, 34, 36, 38) includes a cam follower (30) attached to said cutter blade (26) and cam structure (38) accommodating said cam follower (30), said cam follower (30) moving in said cam structure (38) during rotation of said sheet material support roller (22) to sever paper sheet material (12) being transported by said sheet material support roller (22) when said sheet material support roller (22) is rotating to said first position.
The paper sheet material dispenser apparatus according to Claim 3 wherein said cutter blade (26) is movable between an inactive position wherein said cutter blade (26) will not sever said paper sheet material (12) and a severing position wherein a cutting edge of the cutter blade (26) is positioned outwardly of said sheet material support roller (22) to sever the paper sheet material (12) on said sheet material support roller (22).
The paper sheet material dispenser apparatus according to Claim 4 wherein said cutter blade (26) is configured to move toward and be substantially in the inactive position prior to energizing said electric motor (40).
The paper sheet material dispenser apparatus according to Claim 1 additionally comprising a movable shock reducing element (70) for engaging paper sheet material (12) extending between said roll support (14, 16) and said sheet material support roller (22) and displaceable upon tautening of said paper sheet material (12) during pulling of said paper sheet material (12).
The paper sheet material dispenser apparatus according to Claim 1 wherein said electric motor (40) is electrically connected to said electric switch (42) with no control circuit board intermediate the electric motor (40) and the electric switch (42).
The paper sheet material dispenser according to Claim 1 additionally comprising a motor control structure operatively associated with said electric motor and said electric switch for preventing energization of said electric motor to rotate the sheet material support roller if the momentum of the sheet material support roller caused by a user's pull has been sufficient to place the new tail with a predetermined adequate length extending outwardly from said housing.
The paper sheet material dispenser according to Claim 8 wherein said motor control structure is operable to energize said electric motor to further rotate said sheet material support roller if the momentum of the sheet material support roller caused by a user's pull was not sufficient to place the new tail with a predetermined adequate length thereof extending outwardly from the housing.