Title of Invention

DEVICE FOR THE REMOVAL OF SLIPS FROM A CONTINUOUSLY TRANSPORTED SLIP WEB

Abstract

A device for the removal of slips from a continuously transported slip web is composed of a advancement roll pair which continuously advances and holds the slip web, a blade cylinder, which pushes the respective lead end of a slip into an open gripper of a gripper cylinder, a device, arranged between the advancement roll pair and the blade cylinder, for providing transverse perforated lines and a rotating tear-off segment which cooperates with the blade cylinder. In order to enable a simple and rapid adaptation to different slip formats the advancement speed of the advancement rolls, the transverse perforating device and the angle of action of the tear-off segment are correspondingly changed relative to the blade cylinder,

Full Text

DEVICE FOR THE REMOVAL OF SLIPS FROM A CONTINUOUSLY TRANSPORTED SLIP WEB The invention pertains to a device for the removal of slips [of paper] from a continuously transported slip web, having an advancement roll pair which continuously advances and holds the slip web/ having a blade cylinder whose blade, which follows a path along a surface line, pushes the respective lead end of a slip into an open gripper of a gripper cylinder, having a device arranged between the advancement roll pair and blade cylinder, for providing transverse perforations in the slip web and having a rotating tear-off segment which cooperates with the blade cylinder. A device of this type known from practical operation and described with the aid of Figure 2 cannot be reset to different this, the distance from the device which carries out the transverse perforation to the cooperating rotating tear-off segments, or, to f.he grippper of the gripper cylinder respectively, must be changed. Changing this distance is costly, since the drives of the advancement rolls and of the transverse perforating device must also be adjusted to the changed format. That is why the purpose of the invention is to create a device of the aforementioned type which can be adapted to different slip formats simply and rapidly, and with limited structural cost. This problem is solved in accordance with the invention for a device of the aforementioned type by means of the fact that the blade cylinder is provided with two sleeve sections of larger and smaller radius, the tear-off segment cooperates with the sleeve section having a greater radius and rotates at the same peripheral speed as the latter and the diameter of the enveloping cylinder described by the tear-off segment is equal to the radius of the sleeve section having a greater radius, the angle at circumference of the sleeve section having a smaller radius is large enough that the tear-off segment, when passing by the blade cylinder, alternately cooperates with the sleeve section having a greater radius and encounters the sleeve section having a smaller radius, the angle of action of the tear-off segment relative to the blade cylinder can be adjusted, the speed of the advancement rolls can be adjusted between a highest speed, which is less than the peripheral speed of the blade cylinder and corresponds approximately to the speed required by the web start in order, during one rotation of the blade cylinder, to overcome the distance of the path between the perforating device up to the blade cooperating with the gripper, and a minimum speed, which corresponds approximately to the speed which the web start requires in order, during one rotation of the cutter cylinder, to overcome the distance of the path between the perforating device up to the contact point of the tear-off segment on the blade cylinder, a hugger belt is arranged at the section of the periphery of the blade cylinder between the contact point of the blade with the gripper and the contact point of the tear-off segment with the blade, and holds the slip web against the blade cylinder with a sliding contact prior to the separation of a slip from it, and does not entrain the slip without slippage until aftez separation, the transverse perforating device can be adjusted to the web slips in such a way that it provides transverse perforations on the latter at intervals of the desired length of the slip, and the angle of action of the tear-off segment is adjusted such that a tearing off of the slip is carried out when the blade is located precisely in the region of the front end of the web slips. The device in accordance with the invention can be adjusted to different lengths of slips simply and rapidly by means of the fact that the advancement speed of the advancement rolls, the transverse perforating device and the angle of action of the tear-off segment can be correspondingly changed relative to the blade cylinder. A device in accordance with the invention can be used in order to tear slips from the slip web along transverse perforation lines, the greatest length of which slips corresponds approximately to the distance of the contact point of the blade of the blade cylinder in the opened grippers from the transverse perforating device. The shortest cut length of a slip is less than the length from of the contact point of the tear-off segment at the blade cylinder up to the transverse perforating device. After each slip is torn off, the front end of the slip web arrives in the gap between the carrier of the tear-off segment or hugger belt respectively, and the blade cylinder. The front region of the slip web is then held contact with the sleeve of the blade cylinder by means of the bugger belt in with both the sleeve of the blade cylinder as well as the hugger belt gliding over the slip web with slippage, since the latter is advanced at only a limited speed. The perforating device provides the slip web with transverse perforations at desired intervals, with the tearing-off of a slip always being carried out when the transverse perforations are located between the contact point of the tear-off segment at the blade cylinder and the transverse perforating device. A tearing-off in this place is possible, since the tear-off segment and blade cylinder rotate at a greater peripheral speed than corresponds with the advancement speed of the web. In this connection, the adjustment is selected such that, in each case/ at the time at which a tearing-off occurs, the blade of the blade cylinder is located under the front end region of the web, such that a slip is entrained without slippage by the blade cylinder after being torn off, and the hugger belt and the blade introduces the front end of the slip, in correct position, into the open gripper. Also, instead of a transverse perforating device, a device in accordance with the invention can be provided with a cutter which executes a transverse cut. Hence, a tear-off segment can be omitted with this configuration in accordance with the invention. For this device in accordance with the invention, the time at which a removed slip is entrained can be determined solely by means of the execution of the transverse cut. Therefore, the transverse cut is to be carried out at. the point when the blade of the blade cylinder is located in the front region of the slip web, such that a slip which has been removed is thereupon entrained by the blade cylinder without slippage and the front region of the slip can be introduced in the correct position into the gripper. An embodiment of the invention is explained in greater detail in the following, with the aid of the drawings. "-These show Figure 1: a schematic plan view of an adhesive-application device which during sack production cooperates with a device for tearing off base cover sheets from a slip web and depositing the same on the bottoms of sacks which have been pulled open and Figure 2: a schematic plan view of a known device which, during sack production, removes bottom cover sheets from a slip web- in order to put adhesive onto and deposit the same onto the bottoms of sacks which have been pulled open. For the known device, shown schematically in Figure 2, advancement rolls (37), which advance a slip web (38) drawn from a supply reel, not shown, and hold it between themselves without slippage, are supported in a roll stand (36) which, in lateral guides (34,35), can be adjusted in the direction of double arrow C. This slip web is provided with transverse perforations by means of cooperating cutters (39). Advancement rolls (40) turn over the lead end of the slip web (38) to a gripper cylinder (41), into whose gripper (42) a blade (44) arranged on the blade cylinder (43) pushes the front end respectively, of each slip for the purpose of a secure seizing of the same. The gripper cylinder (41) and the blade cylinder (43) are provided with cooperating tear-off segments (45,46), in which, in each case, slips taken over by the gripper cylinder (41) are torn off along the transverse perforation line provided by the cutters (39) . The gripper cylinder (41) cooperates with an adhesive-application roll (46) which provides a slip that has been torn off from the slip web (38) and the front end of which has been taken over by the gripper (42), with an adhesive deposit in accordance with a format. The gripper cylinder (21) thereupon presses the slip, e.g., a base cover sheet, to which adhesive has been deposited in accordance with the format, against workpieces, e.g., open sack bottoms, transported continuously in the direction of the arrow, which workpieces are then released by the gripper (42). In order to change the format of a slip which has been removed from the slip web (38) it is necessary, for the known device evident from Figure 2, to move the roll stand (3 6) in the direction of double arrow C, which, however, is extraordinarily laborious because the drive is adapted after each move. In contrast, the device (30) for the removal of slips from a slip web and for the transfer of the slips to these workpieces to be completed, in accordance with the invention as seen from Figure 1, can be changed to different formats much more simply and rapidly. For the device in accordance with the invention, evident from Figure 1, the slip web (31) is pulled up by means of the advancement and holding rolls (50) . It is thereupon provided with Once the slip web (31) has been provided with transverse perforated lines, the lead end of the slip web arrives, by means of cooperating guiding sheets (53), into the gap between the blade cylinder (54) and the tear-off cylinder (56) provided with a tear-off segment (55). Between the contact point of the blade gripper cylinder (62) and the tear-off cylinder (56)., the front region of the slip web (31) is pressed against the sleeve of the blade cylinder (54) by means of a hugger belt (65), which runs over regions of the tear-off cylinder and guide rolls.--The hugger belt (65) can be composed of several continuous driving belts, revolving parallel to each other, and revolves at a speed which corresponds to the peripheral speed of the blade cylinder (54). The hugger belt (65) presses the front region of the slip web so strongly against the sleeve of the blade cylinder (54), that both the hugger belt as well as the sleeve of the blade cylinder (54) slide over the slip web, with slippage, so long as the latter is held by the advancement roll pair (50) which advances the slip web (31) at only a limited speed. Not until a tearing off occurs is a slip, which has been torn off, entrained without, slippage. The blade cylinder (54) is provided with two sleeve sections, namely, a sleeve section (57) having a greater radius and a sleeve section (58) having a smaller radius, with the clamping force required for a tearing off being summoned up by the tear-off segment (55), only if the latter cooperates with the sleeve section (57), whereas the sleeve section (58) runs under the tear-off segment (55) without causing a clamping to occur. In order to guarantee that the tearing off of a slip is always carried out at the same angular position of the blade cylinder (54) for every format adjustment, the greater radius of the sleeve section (57) is equal to the diameter of the enveloping circle of the tear-off segment (55). After a format change, in order to be able to undertake a tearing off of the slip in correct phase, the angle of the tear-off segment (55) can be adjusted relative to the tear-off cylinder (56) , such that an angular tearing-off location on the blade cylinder (54) can be adjusted for. The ability of the tear-off segment (55) to be adjusted relative to the tear-off cylinder (56) is indicated by means of the elongated hole (68) having a semicircular shape. In order to be able to tear off a slip from the slip web (31) along the transverse perforated lines, the tear-off cylinder (56), along with the tear-off segment (55) and blade cylinder (54), revolves at a greater peripheral speed than the clamping and advancement rolls (50). A tearing off along a transverse perforated line is always carried out when a perforated section is located between the roll pair (55) [sic; 51,52] and the tear-off segment (55) located in the clamping position and the blade (60) is located in the region of the front end of the slip web (31). During tearing-off process, the perforating, cutters (51/52), of course, must not act upon the slip web (31), The respective leading end of a slip which has been torn off is pushed, by the blade (60) of the blade cylinder (54), into the open gripper (61) of the gripper cylinder (62). On the gripper cylinder (62), the slip is thereupon provided with an adhesive deposit by the adhesive-application roll (10) in accordance with the format, and thereupon pressed onto a workpiece, e.g., the bottom of a sack which has been drawn up, which is continuously transported in the direction of arrow B. The adhesive-application roll (10) is part of an adhesive-application device (29) which has been described in Patent Application No. 19,532,582.6, to which reference is made for a more detailed representation. In order to bring about a format change of slips to be torn off, it is merely required, for the device in accordance with the invention, to allow the advancement roll pair (50) to revolve at a faster or slower speed, such that different sized advance lengths of the slip web (31) can be pushed between the hugger belt (65) and the sleeve of the blade cylinder (54) up to the point of a tearing off. Naturally, the intervals of the transverse perforated lines and the angle of action of the tear-off segment (55) must be correspondingly adjusted, which can be carried out under computer control. Claims 1. Device for the removal of slips [of paper] from a continuously transported slip web, having an advancement roll pair which continuously advances and holds the slip web, having a blade cylinder whose blade, which follows a path along a surface line, pushes the respective lead end of a slip into an open gripper of a gripper cylinder, having a device arranged between the advancement roll pair and blade cylinder, for providing transverse perforations in the slip web and having a rotating tear-off segment which cooperates with the blade cylinder, characterized in that the blade cylinder is provided with two sleeve sections of a greater and smaller radius, the tear-off segment cooperates with the sleeve section having a greater radius and rotates at the same peripheral speed as the latter and segment is equal to the radius of the sleeve section having a greater diameter, the angle at circumference of the sleeve section having a smaller radius is great enough that the tear-off segment, when passing by the blade cylinder, alternately cooperates with the sleeve section having a greater radius and encounters the sleeve section having a smaller radius, the angle of action of the tear-off segment relative to the blade cylinder can be adjusted, the speed of the advancement rolls can be adjusted between a highest speed, which is less than the peripheral speed of the blade cylinder and corresponds approximately to the speed required by the web start in order, during one rotation of the blade cylinder, to overcome the distance of the path between the perforating device up to blade cooperating with the gripper, and a minimum speed, which corresponds approximately to the speed which the web start requires in order, during one rotation of the blade cylinder, to overcome the distance of the path between the perforating device up to the contact point of the tear-off segment on the blade cylinder, a hugger belt is arranged at the section of the periphery of the blade cylinder between the contact point of the blade with the gripper and the contact point of the tear-off segment with the blade cylinder, which hugger belt holds the slip web against the sleeve of blade cylinder with slippage prior to the separation of a slip from the same, and does not entrain the slip without slippage until after separation, the transverse perforating device can be adjusted to the speed of the slip web in such a way that it provides transverse perforations on the latter at intervals of the desired length of the slip, and the angle of action of the tear-off segment is adjusted such that a tearing off of the slip is carried out when the blade is located precisely in the region of the front end of the slip web. 2, Device for the removal of slips [of paper] from a continuously transported slip web, having an advancement roll pair which continuously advances and holds the slip web, having a blade cylinder whose blade, which follows a path along a surface line, pushes the respective lead end of a slip into an open gripper of a gripper cylinder and having a cutter device, arranged between the advancement roll pair and blade cylinder, for the removal of slips from the slip web by mcano of tranovcrcc cuts, characterized in that a hugger belt is adjusted on a section of the periphery of the blade cylinder, which hugger belt, before separation of a slip from the slip web, holds the slip web in contact with the blade cylinder with slippage and does not entrain the slip without slippage until after separation/ the speed of the advancement rolls can be adjusted between a highest speed, which is less than the peripheral speed of the blade cylinder and approximately corresponds to the speed which the web start requires/ during one rotation of the blade cylinder, in order to overcome the distance of the path between the cutter device up to the blade cooperating with the gripper, and a minimum speed, which approximately corresponds to the speed which the web start requires in order, during one rotation of the blade cylinder, to overcome the distance of the path between the cutter device up to the contact point of the tear-off segment on the blade cylinder, and in that the time to carry out each transverse cut is adjusted such that a transverse cut in order to remove a slip is carried out when the blade is located precisely in the region of the front end of the slip web. A device for the removal of slips from a continuously transported slip web is composed of a advancement roll pair which continuously advances and holds the slip web, a blade cylinder, which pushes the respective lead end of a slip into an open gripper of a gripper cylinder, a device, arranged between the advancement roll pair and the blade cylinder, for providing transverse perforated lines and a rotating tear-off segment which cooperates with the blade cylinder. In order to enable a simple and rapid adaptation to different slip formats the advancement speed of the advancement rolls, the transverse perforating device and the angle of action of the tear-off segment are correspondingly changed relative to the blade cylinder,

Documents:

1680-cal-1996-abandoned letter.pdf

1680-cal-1996-abstract.pdf

1680-cal-1996-claims.pdf

1680-cal-1996-correspondence.pdf

1680-cal-1996-description (complete).pdf

1680-cal-1996-drawings.pdf

1680-cal-1996-form 1.pdf

1680-cal-1996-form 2.pdf

1680-cal-1996-form 3.pdf

1680-cal-1996-form 5.pdf

1680-cal-1996-pa.pdf

1680-cal-1996-priority document.pdf

1680-cal-1996-specification.pdf