DEVICE FOR OPENING SHEET-LIKE MATERIAL, SUCH AS PACKING PAPER, AROUND A CYLINDRICAL OBJECT

Abstract: Device for opening sheet-like material, such as packing paper, around a cylindrical object (V), which device comprises a support (4) for the object as well as a carrier (3) which is movable relative to the support over a predetermined path length and has at least one wheel pair (21) whereof the rotation shafts of the wheels enclose an angle, this such that during this movement of the carrier the wheel peripheries exert on the sheet-like material (P) a force directed toward each other in order to pull the sheet-like material more tightly around the object and to form a standing fold, wherein the carrier is also provided with a cutting member (7), which is situated behind the wheel pair in the direction of movement, wherein at the beginning of the path length is arranged an inserting member (28) which can be carried transversely of the movement of the carrier from a position outside the support to a position close to the cutting member and vice versa in order to facilitate cutting into the packaging.

Description: DEVICE FOR OPENING SHEET-LIKE MATERIAL, SUCH AS PACKING PAPER, AROUND A CYLINDRICAL OBJECT The invention relates to a device for opening sheet- like material, such as packing paper, around a cylindri¬ cal object, which device comprises a support for the object as well as a carrier which is movable relative to the support over a predetermined path length and has at least one wheel pair, whereof the rotation shafts of the wheels enclose an angle, this such that during this movement of the carrier the wheel peripheries exert on the sheet-like material a force directed towards each other in order to pull the sheet-like material more tightly around the object and to form a standing fold, wherein the carrier is also provided with a cutting member, which is situated behind the wheel pair in the direction of movement. Such a device is described in the Netherlands patent application 9201954. The problem which can occur in practice is that the packaging round the cylindrical object has become creased as a result of storage and transportation, which prevents the outward bulging of the packaging as a result of the rubbing effect of the pair of wheels. This is of particu¬ lar importance at the start of the operation, that is, initiating of the opening cut in the packaging, so that the cutting member cannot operate optimally. The invention has for its object to obviate the above stated drawback and provides for this purpose a device which is characterized in that at the beginning of the path length is arranged an inserting member which can be carried transversely of the movement of the carrier from a position outside the support to a position close to the cutting member and vice versa. Due to the inserting member which operates transverse¬ ly of the direction of movement of the carrier and is situated close to the beginning of the opening cut, the packaging can initially be pierced, lifted and this lifted part of the packaging can then be cut into, where¬ after the further bulging deformation of the packaging is provided by the wheel pair. If the device is embodied with a rotatably driven cut- ting wheel or disc, this wheel can be embodied with a light member which co-acts with the inserting member such that the bulging action is partially taken over by the lifting member. Other features and advantages of the invention will be further elucidated in the figure description hereinbelow of an embodiment of the invention. The drawing shows a perspective view of this embodi¬ ment which shows a part of the device close to the begin¬ ning of the packaging. The device consists here of a fixed frame 1 which is embodied on the top side with a guide rail 2 along which a carrier 3 is movable in the direction of the arrow PI. The frame 1 is further provided with a support 4 which serves to receive an object V which here takes a cylin- drical form and "is packed in a paper envelope P which has to be removed by the device. The object V can be of random nature, for example a quantity of bottom or cover parts of cans placed against each other. The carrier 3 is embodied with a downward directed support 5 which has on the underside a forward pointing leg 6. A cutting disc 7 is rotatably mounted in this leg 6, to which bearing shaft is fixed a pulley 8. It is noted that the downward oriented support 5 has a hinge at 9, the pivot axis of which coincides with the axis of a rotation shaft 11 parallel to the rotation shaft of the cutting disc 7. Fixedly attached to the rotation shaft on the front side of the support is a pulley 12 around which is trained a belt 13, which is also trained around the pulley 8. The other side of the rotation shaft 11 is embodied with a tooth wheel 14 around which a toothed belt 15 is trained. The carrier has on either side of the upper end of support 5 two tooth wheels 16 for guiding the toothed belt 15 which is fixed against the underside of the rail 2 and which nestles against that underside of the rail during move- ment of the carriage 3. One of the tooth wheels 16 is driven by a motor 17 on the rear side of carrier 3. The carriage itself is suspended in the guide rail 2 by means of travel wheels 18. The lower hinged part of support 5 is also provided with a sub-frame 19 which is hingedly connected at 20 to that lower part of support 5. The sub-frame 19 carries a wheel pair 21 the rotation shafts of which enclose an angle with each other, this such that in the direction of the arrow PI the wheel discs are directed outward. The sub-frame 19 is provided beyond the rotation shaft 20 with a finger 22 which can co-act with a rise cam 23 which is connected to the frame 1. In the position shown the finger 22 lies under the rise cam 23 and in the drawn position raises the wheel pair 21. The frame is also provided with a downward directed pivot arm 25 which is movable round a horizontal pivot shaft 27 relative to the frame by means of a pneumatic cylinder 26. The underside of pivot arm 25 has an insert- ing member 28, ' which here takes the form of a blade, the free end of which is pointed at 29, wherein the underside has a recess 30. The pivot arm is also provided with a cam 31 which co- acts with a rise stop 32 which is arranged on the fixed support 5 of carrier 3. It is finally noted that under the part 6 of the support 5 is arranged a lifting member 35 in the form of a strip-like body, the free end of which is formed for example into a fork, between the teeth of which the cutting edge of cutting disc 7 can operate. The above stated device operates as follows: When an object V with packing P arranged therearound is laid onto the support 4 the wheel pair 21 is in the upward directed position. By energizing the cylinder 26 the arm 25 is carried to the position as according to the dashed line in the figure, wherein the tip 29 of the inserting member 28 penetrates through the packaging P, wherein the recess 30 is situated in front of the lifting member 35. When motor 17 is started the carrier 3 will be moved in the direc- tion of the arrow PI as a result of the rotation of wheel 16, whereby the lifting member 35 is moved to the right and the tip will likewise penetrate through the packaging P as far as the recess 30 of the inserting member. The wheel pair 21 will then descend because arm 22 is re¬ leased from cam 23. During the continuing movement the wheel pair will cause the packaging to fold into a bulge- shaped portion behind the wheel pair and the lifting member 35 can move through freely under the packaging P. The cutting member in the form of a cutting disc 7 will apply a cut in this bulge-shaped portion, which is facil¬ itated in that during the movement of carrier 3 the toothed belt 15 will unwind round the tooth wheel 14 which sets the belt drive 8, 12 and 13 into motion and thus the cutting member 7. As soon as the stop 32 on the fixed support 5 contacts the cam 31, the arm 25 is pushed back in the direction of the position drawn in full lines, whereafter cylinder 26 can further be energized by a sensor (not shown) and retracts the arm 25. This retraction will take place before the support 5 approaches the point of insertion in the packaging P by the inserting member. With further movement the packaging P is cut through in a straight line. The invention is not limited to the above described embodiment. In order for example to enhance the ballooning effect of the packaging P, the blade-like inserting member 28 can be replaced for example by a hollow needle for sup- plying pressurized air under the packaging P. The hollow needle is connected for this purpose to a pressure source (not shown) . The device can also take a double-sided form, that is, a travel wheel pair 21 with cutting member 7 and lifting member 35 are arranged mirror-symmetrically under carrier 3, so that the device can also be moved along guide 2 in the direction opposite to that of PI while cutting open a new object, but from the other side. A pivot arm 25 with inserting member 28 will of course also be arranged on the other side.

Claims: CLAIMS 1. Device for opening sheet-like material, such as packing paper, around a cylindrical object, which device comprises a support for the object as well as a carrier which is movable relative to the support over a predeter- mined path length and has at least one wheel pair whereof the rotation shafts of the wheels enclose an angle, this such that during this movement of the carrier the wheel peripheries exert on the sheet-like material a force directed towards each other in order to pull the sheet- like material more tightly around the object and to form a standing fold, wherein the carrier is also provided with a cutting member, which is situated behind the wheel pair in the direction of movement, characterized in that at the beginning of the path length is arranged an in- serting member which can be carried transversely of the movement of the carrier from a position outside the support to a position close to the cutting member and vice versa. 2. Device as claimed in claim 1, wherein a cutting disc is suspended rotatably on the carrier as cutting member, characterized in that under the cutting disc is placed a sheet material lifting member, and the inserting member has a recess on the underside for receiving the lifting member when the inserting member is lying in the other position. 3. Device as claimed in claims 1 and 2, characterized in that the inserting member is suspended on a lever which is pivotable relative to the frame of the device and provided with a cam which co-acts with a stop on the carrier. 4. Device as claimed in any of the foregoing claims, characterized in that the pair of wheels are mounted on a sub-frame which is hingedly coupled to the carrier. 5. Device as claimed in any of the foregoing claims, characterized in that the cutting disc is rotatably driven, which drive is derived from the movement drive of the carrier.

Inventors: VAN OORD JAN JASPER JACOB, VAN OORD, JAN, JASPER, JACOB
Applicants: OORD JAN JASPER JACOB VAN, VAN OORD, JAN, JASPER, JACOB
Application year: 1995
Main classification: B65B69
IPC codes: B65B69