FR2596034A1 - Improved apparatus for simultaneously dispensing and cutting sheets of rolled-up materials - Google Patents

Abstract

The subject of the invention relates to the technical sector of the means for dispensing lengths of materials rolled up on roll supports. The apparatus is of the type in which a roll of wiping material, mounted so as to rotate freely on a wall support 1, is applied using pressure directly on a drum 2 having a non-slip surface, so that, simply by manually pulling on the sheet of material emerging from the apparatus, a sheet is dispensed and automatically detached, the length of which sheet is equal to the diameter of the drum; the apparatus comprises a toothed cutting device associated with the drum and comprising a cutting blade and a blade carrier; the apparatus, according to the invention, comprises in the region of the cutting device, in order for the cutting blade to go back into the drum, a complementary means acting in combination with the return spring 11 of the blade carrier and the profile of the fixed cam 12, the said complementary means separating the exiting and return movements of the cutting blade, the said means acting in succession taking over one after the other.

Description

 The invention relates to an improved apparatus for distributing and cutting out strips of wound material.

 The object of the invention relates to the technical sector of the means for distributing lengths of material wound on reels. In particular, but not exclusively, the invention applies to distributors of paper, wadding and similar wiping materials.

 The apparatus according to the invention is of the type according to which a roll of wiping material, mounted for free rotation on a wall support (1), is applied under pressure directly to a drum (2) with non-slip surface , so that by simple manual pulling on the strip of material projecting from the apparatus, a strip is automatically dispensed and detached, the length of which is equal to the diameter of the drum. This is obtained by a serrated cutting device associated with the drum and cooperating with a cam to protrude from the drum in an arc of a circle when said drum is rotated by traction on the material, so as to penetrate into the material. thus stretched on both sides of the cutting device. After cutting, the drum launched returns to its initial position by the action of various complementary members, such as parachute, ratchet, stop, arranged on the drum and on the support, a new strip of material automatically overflows under the device after cutting.

 Such a device has been described in its basic concept in patent FR 2,332,215 belonging to the applicant then has been the subject of numerous researches and the improvements have been defined in particular in French patents 83.19815, 84.04695, 85.02873, 85.19447. The cutting devices developed by the inventor from the defined characteristics are normally operated with reliability and flexibility of operation.

 The improvements brought about by the present invention essentially refer to the cutting device, the trajectory movement of the blade in and outside the drum has been defined in its general concept and its principle of implementation. combination with cam means.

It will be recalled, in particular with reference to FIG. 2, of the drawings showing the cutting device as illustrated in FIG. 7 of patent 2,332,215., Briefly
- the cutting device consists of a serrated blade (3), associated with a blade holder (4) articulated by pins (5) on the flanges (6) of the drum
on one of the axes is angularly wedged, outside the drum on a profiled arm (7) forming a crank pin, a roller (8) intended to bear on the cam (9) integral with one of the bearings of the drum, the cam integral with the bearing and the tool holder with its connecting member with the cam are angularly arranged in a precise manner with respect to the eccentric lever (10) for launching the drum, to obtain the output of the tool holder from the drum only at the end of traction on an overhanging band, that is to say after the neutral lever has passed the eccentric
- A spring (11) attached to a flange of the drum and to the tool holder, ensures the return of the tool holder in the retracted position in the drum after cutting, and allows the roller to follow the cam.

 The improvements made aim at improving the good return and the re-entry of the cutting blade inside the drum after launching of the latter after the instantaneous cutting operation of the strip of wound materials.

 According to a first characteristic, the apparatus is remarkable in that it comprises, at the level of the cutting device for ensuring the re-entry of the cutting blade into the drum, an additional means acting in combination with said return spring of the blade holder and said profile of the fixed cam, said complementary means dissociating the movements of exit and re-entry of the cutting blade, said means acting successively taking over from one another.

 These characteristics and others will emerge clearly from the following description.

To fix the subject of the invention illustrated in a nonlimiting manner in the figures of the drawings where:
FIG. 1 is a cross-sectional view showing the apparatus with the device for controlling the cutting of the strips of material,
FIG. 2 is an end view in profile showing the drive means of the cutting device as described and claimed in patent FR 2,332,215,
FIG. 3 is a front view of the device according to the invention,
FIG. 4 is a detailed view of the blade holder and of the drive means of the cutting device ensuring the exit and then the return of the blade from the drum,
FIG. 5 is a cross-sectional view along line 5-5 of FIG. 3,
FIG. 6 is a cross-sectional view along the line VI-VI of FIG. 3,
- Figure 7 is a cross-sectional view illustrating an alternative embodiment of the device allowing the reentry of the blade in the drum.

 In order to make the object of the invention more concrete, it is now described in a nonlimiting manner.

With reference to FIG. 3, to allow better, flexible and silent operation of the cutting device during the rotation of the drum and in particular during the re-entry of the blade into the drum after cutting, the invention aims to achieve and design a complementary means acting in combination with said return spring (11) of the blade holder (4) disposed inside the drum on the one hand and said profile of the fixed cam (12) integral with one of the bearings or integrated into the housing flange on the other hand.

 The complementary means as implemented according to the invention has the advantage of dissociating the exit movement of the blade from the drum.

 According to a first embodiment, the blade holder (4) has on the side opposite to the positioning of the follower roller (8) on the fixed cam profile (12) illustrated in FIGS. 1, 4 and 6, a second arm (13) attached or molded directly angularly arranged substantially in a plane opposite to the first arm (7) supporting the roller (8). The second arm disposed inside the drum receives at the end a finger (14) capable of projecting axially from the drum. According to an additional arrangement, a cam profile (15) is attached fixed to the flange of the chassis or formed directly with the latter. This additional cam (15) arranged relative to and around the axis of the drum comprises a useful sector (AB) on which the finger (14) will come to bear when the cutting blade enters the drum. the cam (15) comprises a kind of notch (151) in which the finger (14) is disposed when the roller (8) is disposed at the end of the cam (12), that is to say before the re-entry of the blade cut inside the drum. During the launching phase of the drum, then exit from the cutting blade of the drum thanks to the rotation of the follower roller (8) on the profile of the initial fixed cam (12), the finger (14) is established so that it has no contact with the profile of the complementary cam (15). If one refers to FIGS. 4 and 6, the cam (15) could have a section limited to the useful sector AB along the line in dashed lines thus highlighting the absence of contact of the finger (14) on said cam ( 15) when the blade comes out.

 Thus the first arm (7) forming a crank pin normally pushes the blade holder while making it come out.

 After cutting the strip of material when the roller (8) is at the end of the fixed cam corresponding to the neutral point of the eccentric lever (10), the reverse movement must be carried out, i.e. retraction of the blade. At this time, the finger (15) comes into contact with the useful sector of the cam (15) substantially at point A as illustrated. The support arm (13) associated with the blade holder and in combination with the latter which is articulated on the axis (5), pushes by tilting the blade holder and makes the blade return gradually, the finger (15) traversing the surface useful (AB) of the added cam (15). The spring (11) arranged inside the drum acts in combination with the second arm to assist the return of the cutting blade. To allow movement of said finger (1), a window (16) is provided, profiled in the lateral flange of the drum thus authorizing the circumvention of the complementary cam (15) by the finger (14). According to this characteristic arrangement, two separate means are thus obtained which act in successive combination to carry out then return to the cutting blade. The means are arranged on either side of the lateral sides of the drum, taking over from one another when the roller (8) escapes from its cam (12). The second arm (13) associated with the blade holder acts with a counterweight effect when one arrives at the blade return phase and its associated finger (14) which follows the cam profile (15) allows precise repositioning, flexible and silent cutting blade in the initial position. The roller (8) associated with the blade holder can then, without difficulty, bypassing the remaining profile of the cam (12), return to the initial position. The implementation of this improvement is simple and inexpensive. It provides the important advantage of imparting increased operating flexibility of the device independently of the tensions made on the strips of wound material to be cut.

 According to an alternative arrangement illustrated in FIG. 7, the complementary means associated with the return spring (11) of the blade holder and with the fixed cam (12) which is associated with the follower roller (8), is in the form of a simple cylindrical stop or pad (17), for example attached or directly formed with the flange of the casing. The position of this stop is judiciously determined and in fact corresponds to the neutral position of the eccentric lever when the roller (8) is at the end of the fixed cam (12) after the cutting blade has come out of the drum. This stop is made of rubber for example or any material giving it a damping and braking effect.

 According to a mounting possibility, the fixed cam (12) is arranged on the same side as the stop (17). When the follower roller (8) comes to the end of the cam (12), that is to say in neutral of the eccentric lever, the roller (8) comes into point contact and presses on the stop (17) which acts return means and thus allows in combination with the spring (11) the withdrawal of the cutting blade in the drum. This point stop thus allows better guiding of the cutting blade. Thus, it is important that the re-entry of the cutting blade is carried out under the best guiding conditions, the use of the complementary return stop being sufficient to orient the follower roller (8) disposed as necessary. other side of the drum in connection with the cam profile (12), the spring return action (11) ensuring the return to the rest position for a new cycle.

 Thanks to this arrangement, which is extremely simple and very reliable, a traction gain of approximately 250 grams is also obtained thanks to the simplification of the mechanisms.

 According to another mounting possibility not illustrated, the use of the stop (17) and a finger similar to that mounted on the second arm associated with the blade holder in the previous example is combined. In this case, the complementary means comprises as a whole, in combination, the stop (17), the finger and the arm, and is arranged on the side opposite to the mechanism (8-12) allowing the output of the cutting blade.

 Under these conditions, it is the finger which will come into punctual action on the stop (17). In this embodiment, the cam (15) described in the first embodiment is eliminated.

 The advantages are apparent from the description; the simplicity of the device and its high reliability are emphasized.

 The invention is in no way limited to that of its modes of application any more than to those of the embodiments of its various parts having been more especially indicated, on the contrary it embraces all variants.

Claims (7)

- 1 - Improved apparatus for the simultaneous distribution and cutting of strips of wound material, of the type in which a roll of wiping material, mounted in free rotation on a wall support (1) is applied under pressure directly to a drum (2 ) with non-slip surface, so that by simple manual pulling on the strip of material overflowing from the device, a strip is distributed and automatically detached, the length of which is equal to the diameter of the drum, the device comprising a cutting device serrated associated with the drum and comprising a cutting blade and a blade holder, said blade holder being articulated by axes on the flanges of the drum; on one of the axes being wedged angularly a profiled arm forming a crank pin supporting a roller (8) intended to rest and move around a fixed cam (12) integral with one of the bearings of the drum to obtain the exit of the blade holder of the drum, only at the end of traction on the overhanging strip, that is to say after the neutral point of the eccentric lever (10) has passed; a spring (11), attached to a flange of the drum and to the blade holder, ensuring the return of the blade holder in the retracted position in the drum after cutting and allowing the roller to follow the cam; said apparatus being characterized in that it comprises, at the level of the cutting device, to ensure the re-entry of the cutting blade into the drum, complementary means acting in combination with said return spring (11) of the blade holder and said profile of the fixed cam (12), said complementary means dissociating the movements of exit and re-entry of the cutting blade, said means acting successively by taking over from one another. - 2 - Apparatus according to claim 1, characterized in that the additional mayen consists in the addition to the blade holder (4) on the side opposite to the positioning of the follower roller (8) on the profile of the fixed cam (12), a second arm (13) angularly disposed substantially in a plane opposite to the first arm (7) roller support (8), said second arm disposed inside the drum (2) receiving at the end a finger (14) capable of cooperating with a complementary cam profile (15) formed on the flange facing the chassis; the cooperation between said finger (14) and the cam profile (15) on a useful section (AB) intervening when the neutral lever of the eccentric lever (10) passes and taking over to authorize the retraction of the cutting blade in the drum. - 3 - Apparatus according to claim 2, characterized in that the complementary cam profile (15) comprises an internal notch (151) in which is placed the finger (14) when the roller (8) is disposed at the end of the cam ( 12) before the cutting blade retracts inside the drum. - 4 - Apparatus according to claims 2 and 3 together, characterized in that the lateral flange of the drum has a profiled window (16) allowing the external projection of the finger (14) and its support on the only useful part (AB) of said cam. - 5 - Apparatus according to claim 1 characterized in that the complementary means associated with the return spring (11) of the blade holder and the fixed cam (9) is used in the form of a stop (17) forming a shock absorber and brake secured to one of the flanges of the casing, said stopper being judiciously positioned to correspond to the neutral position of the eccentric lever (10) when the roller (8) is at the end of the fixed cam (12) after exit of the cutting blade from the drum, said stop (17) providing a guiding and returning function cooperating with a means associated with the blade holder to ensure the re-entry of the cutting blade into the drum.  - 6 - Apparatus according to claim 5, characterized in that the means associated with the blade holder cooperating with the stop (17) is the follower roller (8) mounted on the same lateral side of the drum as said stop. - 7 - Apparatus according to claim 5, characterized in that the means associated with the blade holder cooperating with the stop (17) is a finger mounted on a second arm associated with the blade holder of the cutting device, said stops, finger and second arm being arranged on the opposite lateral side of the drum to that receiving the mechanisms (8-12) authorizing the exit of the cutting blade.