Elongated-member-driving apparatus – With means to move or guide member into driving position – Including supply magazine for constantly urged members
Patent
1994-10-06
1996-12-10
Rada, Rinaldi I.
Elongated-member-driving apparatus
With means to move or guide member into driving position
Including supply magazine for constantly urged members
227131, 227156, B25C 106
Patent
active
055823408
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a drive mechanism in a stapler for driving staples into an object, such as a bundle of paper sheets, said stapler having a frame, a magazine arranged in the frame and containing staples, and a drive element adapted to push staples out of the magazine and drive them into the object and, to this end, be reciprocated by means of the drive mechanism.
In a prior-art stapler of this type, the drive mechanism consists of a wheel driven by an electric motor via a transmission unit, and a lever supporting the drive element at one end. The wheel has an eccentric pin engaging in a groove at the other end of the lever in order, when the wheel is rotated, to pivot the lever back and forth so as to reciprocate the drive element. This drive mechanism is quite bulky and difficult to mount. Moreover, it can only be used for driving a single reciprocative element (the drive element). In the known stapler, which is intended for U-shaped staples, there is thus provided another drive mechanism for reciprocating an operating member actuating a clinching mechanism, i.e. a mechanism bending the staple legs in such a manner that the staples after completed bending (clinching) have a uniform thickness throughout their entire length.
SUMMARY OF THE INVENTION
An object of the present invention is to overcome these drawbacks and provide a simple drive mechanism which requires less space, is easy to mount and which can also be used for reciprocative both the drive element and another reciprocative element, such as an operating member for operating a clinching mechanism.
This object is achieved by means of a drive mechanism which is of the type stated in the introduction to the specification and which is characterised in that it consists of a drive cylinder rotatably mounted in the frame and having in its circumferential surface an endless groove extending substantially helically from a starting point to a turning point axially spaced therefrom, and thence substantially helically back to the starting point, said groove accommodating a groove follower connected to the drive element in order, upon rotation of the drive cylinder, to reciprocate the drive element.
In a preferred embodiment, the groove accommodates a second groove follower connected to a second reciprocative element, such as a reciprocative operating member for operating a clinching mechanism, in order, upon rotation of the drive cylinder, to bring about a reciprocating motion of said second element that is coordinated with the reciprocating motion of the drive element.
The groove extends one or several turns around the drive cylinder.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to the accompanying drawings, in which:
FIG. 1 is a sectional view showing a portion of a stapler equipped with a drive mechanism according to the invention, the drive mechanism being shown in a first position;
FIG. 2 is similar to FIG. 1 but shows the drive mechanism in a second position rotated approximately 180.degree. with respect to FIG. 1;
FIG. 3 is similar to FIG. 1 but shows the drive mechanism in a third position rotated approximately 180.degree. with respect to FIG. 2;
FIG. 4 is similar to FIG. 1 but shows the drive mechanism in a fourth position rotated approximately 45.degree. with respect to FIG. 3;
FIG. 5 is similar to FIG. 1 but shows the drive mechanism in a fifth position rotated approximately 45.degree. with respect to FIG. 4;
FIG. 6 is similar to FIG. 1 but shows the drive mechanism in a sixth position rotated approximately 90.degree. with respect to FIG. 5;
FIG. 7 is an enlarged sectional view taken along the line VII--VII in FIG. 1;
FIG. 8 is a side view showing a drive element which can be reciprocated by means of the drive mechanism;
FIG. 9 is a side view showing an operating member which can be reciprocated by means of the drive mechanism; and
FIG. 10 is an exploded view showing a drive cylinder constituting the drive mechanism, as well as the drive eleme
REFERENCES:
patent: 3982678 (1976-09-01), Olson
patent: 4834278 (1989-05-01), Lin
Isaberg AB
Rada Rinaldi I.
Schrock Allan M.
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