A PUNCH FOR PAPER AND SIMILAR ITEMS

Abstract: A punch, especially for paper and paper items, consisting of a lower part (10) with a punching die, an inlet slot (11) for the material to be punched, and punching die guides for the punching device punching dies as well as a pressure plate shaped upper part (12) shaftless and swivellingly connected to the lower part (10). The lower part (10) is provided with a during the extrusion continuously running channel (14), whereas the upper part (12) is in a similar way provided with a during the extrusion continuously running channel (15), between which channels a borderlike connecting link (L, LB) is running being equipped with rims (L1, L2; LB1, LB2) or similar engaging said channels for a linkable relative joint between the upper and the lower parts.

Description: A punch for paper and similar items The present invention relates to a punch for paper and similar items. A previously proposed punch (DE-3,230,132 C2), especially for paper and paper items, consists of a lower part with a punching die, an inlet slot for the material to be punched, and punching die guides as well as an as a pressure plate shaped upper part shaftless and swivellingly connected to the lower part. The characteristic feature of this previously proposed punch is, that the upper part and the lower part are shaped as separate, extruded or transfer moulded parts and in that one part is equipped with a slot running in the longitudinal direction of this part for a shaftless relative connection of them, in which slot engages a bearing prolongation in the other part, being in profile adapted in cross section to the inlet slot and detained in it with clearance. More simply, the previously proposed punch is assumed to have a hinge in form of an elongated male/female joint. In practice it has been found that such a hinge can will seize somewhat under certain circumstances. The present invention is envisaging to avoid said problem and the punching device according to the present invention with an upper part and a lower part in form of separate extruded parts is characterized for the stated purpose mainly in that the lower part is provided with a during the extrusion continuously running channel, whereas the upper part in a similar way is provided with a during the extrusion continuously run¬ ning channel, between which channels is provided a rimshaped connecting link, provi¬ ded with in said channels engaging ribs or similar for a hinged relative connection be¬ tween the upper and the lower parts. According to the invention it is suitable that the lower part channel has a profile of a sidewise open slot with a generally circular cross section and with an opening being less than the slot diameter, whereas the upper part channel has a profile of a sidewise and somewhat downwards open slot with a generally circular cross section and also with an opening being less than the slot diameter, the connecting link rims being longitudinally engaged in said rims. Moreover, it is according to the invention suitable that the connecting link has a generally C-shaped cross section and consists of a stiff material, such as e.g. extruded aluminium. However, it can also consist of a in form stable but anyhow flexible mate¬ rial such as e.g. nylon. Preferably, the connecting link is outwardly covered to a major extent with a cover strip being a part of the upper or the lower part. The invention is described more in detail here below in connection with the attached drawing. Figure 1 is a schematic cross section of an as an eaxample chosen embodiment of a punch according to the invention, and Figure 2 is a cross section of an alternative form of the link profile. The shown punch being adapted especially to paper and paper items consists of a lower part 10 with a punching die, an inlet slot 11 for the material to be punched, and here not illustrated punching die guides for the punching dies S illustrated with dotted broken lines as well as an as a pressure plate shaped upper part 12 swivellingly con¬ nected to the lower part 10. The upper part 12 has on its underside a longitudinal slot 13, in which ballshaped upper ends of the punching dies are engaged to be guided uppwards and downwards, respectively, when swivelling the upper part 12 so that the the material introduced into the slot is punched. The lower part 10 is provided with a during the extrusion continuously running channel 14 with a profile of a to the front side and somewhat upwards open slot with a generally circular cross section. The upper part 12 is in a similar way provided with a during the extrusion conti¬ nuously running channel 15 with a profile of a to the back side and somewhat down¬ wards open slot with a generally circular cross section. An in a cross section approximately C-shaped border L with edge rims LI, L2 has its rims engaged with the channels 14, 15, so that the border forms a connecting link between the upper part and the lower part for their swivelling relative engagement. The connecting border or link L can be shorter than the cover strip and the upper and lower parts, respectively, so that the link L remains generally invisible. The connecting link LB shown in figure 2 is generally plane and is provided with with edge rims LBl and LB2 to be engaged in slots similar to the slots 14, 15 for a swivelling relative connection between the upper and the lower parts 10, 12. This con¬ necting link LB may consist of nylon or a somewhat similar material.

Claims: C LA I M S 1. A punch, especially for paper and paper items, consisting of a lower part (10) with a punching die, an inlet slot (11) for the material to be punched, and punching die guides for the punch punching dies as well as an as a pressure plate shaped upper part (12) shaftless and swivellingly connected to the lower part (10), characterized in that.the lower part (10) is provided with a during the extrusion continuously running channel (14), whereas the upper part (12) is in a similar way provided with a during the extrusion continuously running channel (15), between which channels a borderlike connecting link is formed with rims or similar engaging in said channels for a linkable relative joint between the upper and lower parts. 2. A punch according to claim 1, characterized in that the lower part (10) chan¬ nel (14) has a profile of a sidewise open slot with a generally circular cross section and with a smaller opening than the slot diameter, whereas the upper part (12) channel (15) has a profile with a generally circular cross section and with a smaller opening than the slot diameter, the connecting link rims being longitudinally engaged in said rims. 3. A punch according to claim 1, characterized in that the connecting link has a generally C-shaped cross section. 4. A punch according to claim 1, characterized in that the connecting link con¬ sists of a stiff material such as e.g. extruded aluminium. 5. A punch according to claim 1, characterized in that the connecting link con¬ sists of an essentially in form stable, but anyhow flexible material, such as e.g. nylon. 6. A punch according to anyone of the claims 1 - 4, characterized in that the connecting link is outwards mostly covered by a cover strip being a part of the upper or the lower part.

Inventors: JAQUET BILLY, JAQUET, BILLY
Applicants: JAQUET BILLY, SAMHALL OFFICE AB, JAQUET, BILLY
Application year: 1995
Main classification: B26F1
IPC codes: B26D7, B26F1