Source: http://www.google.com/patents/US4276797?ie=ISO-8859-1&dq=7222078
Timestamp: 2014-08-29 15:49:29
Document Index: 746844817

Matched Legal Cases: ['arts 48', 'arts 48', 'arts 68', 'arts 68', 'arts 68', 'arts 68', 'arts 68', 'arts 68', 'arts 68', 'art 69', 'arts 78', 'arts 68', 'arts 78', 'arts 78']

Patent US4276797 - Apparatus for dispensing sheets of web material of predetermined length - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA dispenser for sheets of web material, such as paper towels, from a supply roll, including a housing, means for holding a supply roll of the web material, and means for separating a sheet of the web from the supply roll operable in response to a user pulling the sheet from the housing and arranged to...http://www.google.com/patents/US4276797?utm_source=gb-gplus-sharePatent US4276797 - Apparatus for dispensing sheets of web material of predetermined lengthAdvanced Patent SearchPublication numberUS4276797 APublication typeGrantApplication numberUS 06/044,745Publication dateJul 7, 1981Filing dateJun 1, 1979Priority dateApr 19, 1977Also published asDE2814792A1, US4186633Publication number044745, 06044745, US 4276797 A, US 4276797A, US-A-4276797, US4276797 A, US4276797AInventorsManfred Baumann, Walter BessererOriginal AssigneeApura GmbhExport CitationBiBTeX, EndNote, RefManPatent Citations (10), Referenced by (17), Classifications (12) External Links: USPTO, USPTO Assignment, EspacenetApparatus for dispensing sheets of web material of predetermined lengthUS 4276797 AAbstract A dispenser for sheets of web material, such as paper towels, from a supply roll, including a housing, means for holding a supply roll of the web material, and means for separating a sheet of the web from the supply roll operable in response to a user pulling the sheet from the housing and arranged to present at least a portion of the leading edge of the web ready for a user to seize for the dispensing of a further sheet as a direct result of the user pulling the previous sheet from the dispenser.
What is claimed is: 1. An apparatus for dispensing sheets of web material of predetermined length from a supply of the web material comprising:a housing, means for storing the supply of web material in the housing, and separating means arranged in the housing for separating a sheet of the web material from the remainder thereof in response to a user of the apparatus pulling from the housing the free end of web material in the storing means, the separating means comprising a roller mounted for rotation in the housing, means for guiding the free end of the web over the roller and into frictional driving engagement therewith as it is pulled from the housing, and cutting means arranged on the surface of the roller to provide a cutting line at least part of which extends at an angle other than zero to the axis of the roller such that when a sheet of the web is withdrawn by the user a portion of the leading edge of the remainder of the web is simultaneously advanced outside the housing solely as a direct result of such withdrawal to be available for gripping by a subsequent user. 2. An apparatus according to claim 1, wherein the cutting means comprises a fixed blade thereon extending substantially over the whole width of the roller and projecting from its surface.
3. An apparatus according to claim 2, wherein the blade is disposed helically over the roller surface.
4. An apparatus according to claim 3, wherein the blade extends helically with a left-handed thread over one half of the roller and with a right-handed thread over the other half of the roller.
5. An apparatus according to claim 2, wherein the blade is disposed partially parallel with the axis and partially normal to the axis of the roller.
6. An apparatus according to claim 2 including a backing roller associated with the bladed roller, the backing roller being formed with a groove matching the blade arrangement.
7. An apparatus for dispensing sheets of web material of predetermined length from a supply of the web material comprising:a housing, means for storing the supply of web material in the housing, and separating means arranged in the housing for separating a sheet of the web material from the remainder thereof in response to a user of the apparatus pulling from the housing the free end of web material in the storing means, the separating means comprising a roller mounted for rotation in the housing, means for guiding the free end of the web over the roller and into frictional driving engagement therewith as it is pulled from the housing, and cutting means arranged on the surface of the roller to provide a cutting line at least part of which extends at an angle other than zero to the axis of the roller such that when a sheet of the web is withdrawn by the user a portion of the leading edge of the remainder of the web is simultaneously advanced outside the housing solely as a direct result of such withdrawal to be available for gripping by a subsequent user, and the cutting means comprising a blade arrangement including a plurality of blade portions disposed offset in relation to one another in the peripheral direction of the roller, each of the blade portions having associated therewith a first lever pivotably mounted inside the bladed roller on a wall thereof, and an operating device including cam members arranged so that when the roller rotates the blade portions are controlled by the cam members to emerge through slots formed in the roller surface. 8. An apparatus according to claim 7, wherein the blade portions are arranged to be controlled by the cam members to emerge in succession through the slots in the roller surface.
9. An apparatus according to claim 7 wherein the roller is mounted on a spindle and the operating devices comprise cam discs attached to the roller spindle.
10. An apparatus according to claim 7 wherein each of said first levers is resiliently biased by means of a spring operative between it and the inside wall of the roller.
11. An apparatus according to claim 7, wherein the operating device comprises a plurality of second levers pivotally mounted eccentrically of a spindle of the roller and articulated to a respective first lever.
This is a division of application Ser. No. 897,453, filed Apr. 18, 1978, now U.S. Pat. No. 4,186,633.
BACKGROUND OF THE INVENTION The invention relates to an apparatus for dispensing pieces of paper or like web material of predetermined length from a supply such as a roll of the web material, having a device, operable by pulling on the free end of the paper web, for parting the pieces of paper from the paper web and for presenting the fresh end of the paper web ready to be seized, after the parted piece of paper has been released.
In known apparatus of this kind, when a piece of paper is pulled out, which is parted from the following paper web by a stationary or moving blade, use is made of a suitable device, for instance, two inter-engaging suction cups, to store energy briefly. The stored energy is then released to push the following end of the paper web out of the apparatus, ready to be seized for the next dispensing operation, when the previously parted piece of paper has been released. This prior art apparatus has been very elaborate and therefore relatively expensive and unreliable.
It is an object of the invention to provide a simply constructed apparatus which, after a piece of paper has been dispensed, reliably makes the following fresh end of the paper web automatically ready to be seized for the next dispensing operation.
SUMMARY OF THE INVENTION Accordingly the present invention provides an apparatus for dispensing sheets of web material of predetermined length from a supply of the web material comprising: a housing, means for storing the supply of web material in the housing, and separating means arranged in the housing and operable in response to a user of the apparatus pulling from the housing the free end of web material in the storing means, to separate a sheet of the web material from the remainder, the separating means comprising a roller mounted for rotation in the housing, means for guiding the free end of the web over the roller as it is pulled from the housing, and cutting means arranged on the surface of the roller to give a cutting line at least part of which extends at an angle other than zero to the axis of the roller, whereby when a sheet of the web has been taken by the user, a portion of the leading edge of the remainder of the web has advanced outside the housing to be available for gripping by a subsequent user. According to the invention, therefore, a single, simply constructed and absolutely reliable device simultaneously parts a piece of paper from the paper web and provides the following end of the web ready to seize, since, due to the cutting line of the bladed roller, the following end of the paper web which is the start of the following sheet of paper automatically and without any delay projects out of the apparatus ready to seize, when the parted piece of paper has left the apparatus.
Bladed rollers with oblique cutting lines for paper dispensing apparatuses are known per se, see for instance U.S. Pat. Nos. 454,316; 1,835,439 and 2,278,029, but these prior art apparatuses require additional expensive devices and steps to make the following end of the paper web ready for seizing.
Accordng to a further aspect the present invention provides an apparatus for dispensing sheets of web material of predetermined length from a supply of the web material comprising: a housing, means for storing the supply of web material in the housing, separating means comprising a bladed roller having a width at least equal to the width of the web material arranged in the housing and operable in response to a user of the apparatus pulling from the housing the free end of the web material in the storing means, to separate a sheet of the web material from the remainder and to leave at least a portion of the leading edge of the remainder of the web available to be gripped by a subsequent user, conveying means arranged to engage the web over a part of its width, non-positive drive means operable between the bladed roller and the conveying means, and a pressure device arranged to urge the web into engagement with the conveyor means.
This simply constructed and reliable device can produce any desired cutting line in the paper web--i.e. even a cutting line extending parallel with the axis of the roller. In this case the following end of the paper web is made ready to seize after the release of the parted piece of paper by the feature that, even after the piece of paper to be dispensed has been completely parted, the pull exerted on such parted sheet of paper is also exerted by means of the pressure device urging the sheet into engagement with the conveying means and the conveying means being connected to the bladed roller, on the following paper web until the parted piece of paper has left the apparatus. Since the conveying device is substantially narrower than the bladed roller, at that moment the following end of the paper web is directly available to be seized for the following operation of dispensing a piece of paper.
The non-positive connection between the conveyor means and the bladed roller can be, for instance, a frictional connection, and the conveyor means can take the form, for instance, of an endless belt or a roller, the pressure device taking the form of a wedge, brush, spring, stationary or synchronised endless belt, or the like. If the pressure device is in the form of an endless belt, it may be guided around the bladed roller. As a result, strictly speaking the pressure device may be considered as performing the functions of the conveying device, and the conveying device may be considered as performing the functions of the pressure device.
BRIEF DESCRIPTION OF THE DRAWINGS Other features, advantages and possible uses of the invention can be gathered from the following description of embodiments thereof, in conjunction with the drawings, wherein:
FIG. 2a is a perspective view of the apparatus illustrated in FIG. 1 without its casing;
FIG. 2b shows a piece of paper delivered by the apparatus illustrated in FIG. 2a;
FIGS. 3a and 3b illustrate a first modified embodiment of the bladed roller and a corresponding piece of paper cut thereby, respectively
FIGS. 4a and 4b illustrate a second modified embodiment of the bladed roller and a corresponding piece of paper cut thereby, respectively;
FIG. 5a shows a pair of cutting rollers according to a third modified embodiment;
FIG. 5b shows a cross-section of the rollers of FIG. 5a in cooperative engagement;
FIGS. 6a and 6b illustrate a fourth modified embodiment of the bladed roller and a corresponding piece of paper cut thereby, respectively;
FIGS. 7a and 7b illustrate a fifth modified embodiment of the bladed roller and a corresponding piece of paper cut thereby, respectively;
FIG. 8 is a longitudinal section through a second embodiment of the invention;
FIG. 9 is a perspective view of the apparatus illustrated in FIG. 8, without its casing;
FIG. 10 is a partially broken-away perspective view of a first embodiment of the bladed roller for the apparatus illustrated in FIGS. 8 and 9,
FIG. 11 is a longitudinal section through the bladed roller illustrated in FIG. 10, showing in chain lines different positions of the blade in the cutting zone;
FIG. 12 is a longitudinal section through another embodiment of the bladed roller, showing in chain dot lines different positions of the blade in the cutting zone;
FIG. 13 is a longitudinal section through yet another embodiment of the bladed roller, showing in chain lines different positions of the blade in the cutting zone;
FIG. 14 is a longitudinal section through a further embodiment of the invention, with a variant construction of the conveying device;
FIG. 15 is a longitudinal section through a further embodiment of the invention, with a variant embodiment of the pressure device, and
FIG. 16 is a side elevation of a construction of a blade for various of the embodiments of the invention.
FIG. 1 shows a dispenser apparatus 10 for dispensing sheets of paper, the dispenser having, for instance, a casing 13 arranged to be attached to a wall 12, means for holding a roll 14 of a paper web 15, a guide roller 16 and a bladed roller 17. As can be seen more particularly from the perspective view in FIG. 2a, the bladed roller 17 has, for instance, a fixed cutting blade 18 which extends helically over substantially the whole roller width and extends out of the roller surface. The cutting line of the blade 18 thus forms with the axis of the roller, or with a generatrix 20 of the roller surface, an angle α corresponding to the pitch angle of the helical cutting line. The bladed roller 17 is rotated by frictional engagement with the web as a user pulls the end of the web 15 out of the housing. As soon as the blade 18 engages the web 15, which is stretched tight by means of the guide roller 16, at the end 21 of the blade (shown on the left in FIG. 2a), a sheet 11 of the web starts to be parted from the following web 15. The parting operation is completed only when the other end 22 of blade 18 (shown on the right in FIG. 2a) engages with the web and a sheet 19 of the following web has emerged from the dispenser housing and is ready to be seized by a user for the following dispensing operation.
FIG. 3a shows a bladed roller 37 for use in the above dispenser having a "herring bone" blade 38 which extends helically with a left-handed thread over one half of the roller and with a right-handed thread over its other half. The sheet 31 of paper produced by the blade 38 is shown in FIG. 3b, and the remaining web is left with a tongue 39 ready to be seized by a user for pulling out a further piece of web.
FIG. 4a shows a further bladed roller 47 which may be used, having a blade 48 at which has parts 48 extending parallel with the axis of the roller and parts 48b extending at right angles to such axis. The sheet 41 of paper produced by the blade is shown in FIG. 4b, with the tongue 49 ready to seize for pulling out such sheet of paper 41.
The blades illustrated in FIGS. 2a, 3a and 4a are merely exemplary advantageous constructions. The blades can be arranged as required over the roller generated surface, as long as the basic condition is met that at least part of their cutting line forms with the axis of the bladed roller an angle differing from zero, so that an adequate piece of the following paper web is left ready to seize for the following paper dispensing operation, when a sheet of paper just dispensed has been parted from the following paper web.
FIGS. 5a and 5b show a further example 57 of a bladed roller which may be used to make the blade cutting operation even more reliable, a backing roller 50 being provided which is formed with a groove 52 matching the blade 58 on the bladed roller. The two rollers 57, 50 are drivably connected via two gearwheels (not shown) whose pitch diameters correspond to the respective roller diameters and which cause the rollers to move synchronously so that the blade 58 pierces the paper web indicated at 55, as it is stretched tightly over the groove 52 in the roller 50; the blade 58 penetrating the groove 52 for this cutting operation, as shown particularly clearly in FIG. 5b.
FIG. 6a shows a further bladed roller 67 which may be used having a blade 68 consisting of a number of parts 68a offset in relation to one another in the peripheral direction of the roller so that they together give a generally helical cutting line. Each of the blade parts 68a is disposed at the end of a lever 60 which is pivotably mounted on the inside wall of the roller 67. For each lever 60 a cam disc 63 is attached to a stationary spindle 62 which also forms a support for the roller 67. When the roller 67 rotates--i.e., when the paper web is pulled out of the apparatus--the blade parts 68a are moved in a predetermined sequence through slots 64 formed in the roller surface for the cutting operation on the sheet of paper concerned. The movement of the blade parts 68a is in each case controlled by the respective cam disc 63. To stabilize the movement of the blade parts 68a, more particularly for their path of movement inside the roller, a spring as shown at 65, can be provided operative between each lever 62 and the inside wall of the roller 67. The path of movement of the blade parts 68a can also be stabilized in this way by a suitable design of part of the cam discs 63 which controls that part of the path of movement of the blade parts 68a which occurs inside the roller. FIG. 6b shows the sheet 61 of paper produced by the blade 68 illustrated in FIG. 6a, which leaves the part 69 of the remaining paper ready to be seized.
FIG. 7 shows a further construction of a bladed roller which may be used having a blade 78 which also comprises a number of parts 78a, generally corresponding to the parts 68a of the blade illustrated in FIG. 6a. In the embodiment illustrated in FIG. 7a blade parts 78a are each disposed at the end of a lever 70, all the levers being mounted on the inside wall of the roller 77. The movement of the blade parts 78a through the slots 74 in the roller surface is controlled in this embodiment by means of levers 73 which are mounted eccentrically of the roller spindle 72 and are each articulated to the levers 70. FIG. 7b shows the sheet 71 of paper produced by the blade 78 illustrated in FIG. 7a, which leaves the tongue 79 of paper ready to be seized.
FIG. 8 shows a further dispenser apparatus 80 for dispensing sheets 81 of paper, the dispenser having, for instance, a housing 83 arranged to be attached to a wall 82, means for carrying a roll 84 of a paper web 85, a guide roller 92, a bladed roller 87, a conveying device 86 and a pressure device 89.
FIGS. 10-13 illustrate various embodiments of the arrangement and control of the blade of the bladed roller for use in the further dispenser 80. Basically in the dispenser 80 it is preferred to use one-part blades but operated in a similar manner to the blade portions shown for the first apparatus 10 in FIGS. 6a and 7a.
The one-part full width blade 128 (shown in FIG. 12) basically corresponds to a portion of the multi-part blade 68 illustrated in FIG. 6a. The blade 128 is therefore disposed at the end of a lever 120 pivotably mounted on the inside wall of roller 127. Attached to the stationary spindle 122 of roller 127 is a cam disc 123 engaging with the lever 120. When the roller 127 is rotated, the blade 128 is moved outwardly in the cutting zone through a slot 124 formed in the roller surface. During the cutting operation the cutting edge of the blade 128 passes through a path of movement 126, three different positions of the lever 20 and blade 128 being shown in FIG. 12 in chain dot lines. A spring 125 can be arranged, for instance, operative between the lever 120 and the inside wall of roller 127, to stabilize the path of movement of the blade.
The one-part full width blade 138, shown in FIG. 13, corresponds to a portion of the multi-part blade 78 illustrated in FIG. 7a. Consequently the blade 138 is disposed at the end of a lever 130 mounted on the inside wall of the roller 137. The blade 138 is controlled in its movement through a slot 134 formed in the roller surface by means of a lever 133 which is mounted eccentrically of the roller spindle 132 and is articulated to the lever 130. During the cutting operation the cutting edge of the blade 138 passes through a path of movement 136, three different positions of the lever arrangement 130, 133 and blade 138 being shown in FIG. 13 in chain dot lines.
FIGS. 10 and 11 show another embodiment of the bladed roller which may be used in the dispenser 80. In this arrangement a blade 108 is pivotably mounted inside the roller 107 on a spindle 103 which is disposed eccentrically of the roller spindle 102 and formed integrally therewith, blade being entrained through a slot 104 formed in the roller surface as the roller 107 rotates. The cutting edge of the blade 108 describes a path of movement 106 as the roller rotates, three different positions of the blade 108 being shown in chain dot lines in FIG. 11. The depth of the blade 108 corresponds substantially to the radius of the roller 107 plus the eccentricity of the spindle 103 in relation to the spindle 102, so that the blade is entrained by the slot 104 over its whole path of movement.
The conveying device 86 illustrated in FIGS. 8 and 9 engages the web over a substantially narrower width than the bladed roller 87 and consists of two endless belts 93, 94, respectively guided around pairs of rollers 95, 96; 97, 98 and disposed respectively at the edge zones of the bladed roller 87. The portion 99 of the paper web 85 which is between the two belts is ready to seize, for a subsequent paper dispensing operation, when the sheet 81 of paper has been dispensed, since in the region above the portion 99 of paper lies, the casing 83 is correspondingly cut away and the rollers 95, 96; 97, 98 and the belts 93 and 94 are mounted to the sides.
When a sheet of paper is separated from the remainder of the web, and pulled out of the apparatus, it held in engagement with the conveyor means formed by the belts 93 and 94 by action of the pressure devices 89. There is also provided a non-positive drive between the conveyor means and the bladed roller 87. Thus as the separated sheet is pulled out the conveyor means and the bladed rollers are driven, and in turn the leading edge of the remainder of the web is also driven out following closely behind the separated sheet as it is pulled out. As a result, the fresh leading edge of web is presented ready to be seized for a subsequent paper dispensing operation.
Of course, other conveying devices could be used as substitutes for the conveying device 86 constructed as illustrated in FIG. 9. For instance, a single endless belt could be arranged in the centre of the roller, the result being that the fresh leading edge of the web is presented ready to seize on the right and left of the single belt. The conveying device can also comprise relatively large rollers. Moreover, a conveying device 146 shown in FIG. 14 consisting of one or two belts can be partially guided around the bladed roller 147, to press the paper web 145 against the bladed roller 147 in the cutting zone and therefore improve the cutting operation. Instead of the conveying belt partially guided around the bladed roller, a device (not shown) which is stationary in relation to the roller can be provided to press the paper web against the roller in the cutting zone.
For every construction and arrangement of the conveyor means it is essential that there should be a non-positive driving connection between the conveyor means and the bladed roller, for instance, by frictional connection, as in the belt construction illustrated in FIGS. 8, 9 and 14, and/or, for instance in an arrangement which is not shown, with a drive optionally including gear wheels between the rollers 95, 97 and the bladed roller 87.
The pressure device 89 shown in FIGS. 8 and 9 consists of two stationary wedges 89a, 89b which are in resilient frictional engagement with belts 93, 94. Instead of the wedges, use can also be made of brushes, springs, stationary belts or belts co-rotating with the paper web, or the like. The essential thing is always that there must be frictional engagement between the web and the conveying means.
In the embodiment illustrated in FIG. 15 the pressure device comprises one or two endless belts 159 which are guided over the bladed roller 157. In this construction the pressure device 159 performs functions of the conveying means, since it is drivably but non-positively connected to the bladed roller, while the conveying means in the form of a belt or belts 156 performs functions of the pressure device.
In all the above arrangements the association between the bladed roller, the conveyor means and the pressure device must be such that when the sheet of paper to be dispensed is parted from the following paper web, the force exerted on the sheet of paper already parted is transmitted to the following paper web until the latter has been pulled along into the position in which its leading edge is ready to be seized for the following dispensing operation.
FIG. 16 shows an advantageous serrated cutting edge 166 of a blade 168 for the bladed roller. The blade 168 also has cut away portions 164, 165 through which, for instance, the conveying belts 93, 94 (FIG. 9) may pass. Such cut away portions are provided in the blade for all those parts of the pressure device and/or the conveying means which extend into the zone of the path of movement of the blade.
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