JPH04269182A - Hand-operated stapler - Google Patents

Abstract

PURPOSE: To provide a stapler having an improved operating mechanism in which a mechanism of the stapler is partially automated, the abrupt force consumption is reduced, and the operation of the stapler simplified. CONSTITUTION: A locking and release mechanism is provided, in which a hammering knife 24 is held at various positions relative to a staple G to be forcibly driven, the hammering knife is rapidly moved on the staple G to be suddenly driven at the release position of a locking claw 45 though a spring 40 which is shortened by operating an upper member 30 of a stapler and coupled with the hammering knife 24, and the characteristic stapling action is generated thereby.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention relates to a manual stapler, in particular for binding small piles of paper or similar objects made of paper, comprising a base plate, a stamping die placed on the base plate, and an opposite side. a magazine which is pivotally supported in the side parts at the side ends and partially covered by an upper part acting as an operating arm, the magazine having a central part for receiving and guiding the needle strip; Starting from a type formed by a groove and a guide web located approximately perpendicular to the central groove and for receiving a percussion knife that slides up and down for separating and driving the needle, in particular It relates to a mechanism for disassociating individual needles from a needle strip and for driving the needles into the material to be bound.

0002

BACKGROUND OF THE INVENTION Manual staplers of the above-mentioned type, which use U-shaped metal needles which are joined as a needle strip, for example by glue, are already generally known. Such a stapler consists of (a) a substrate having a stamping die and a side member used for retention at the opposite end;
(b) - a central groove provided as a feed rail for receiving and guiding the needle strip until the individual needles at the beginning of the strip reach a predetermined separation position; - a central groove provided above the separation position of the feed rail; and a separating rail located approximately perpendicular to this feed rail, which separates the needles present at the ends of the needle strip in a downward movement and drives them into the material to be stitched and the needle ends are permanently fixed by a stamping die. (c) a magazine for the needles having a striking knife disposed vertically movable in a separating rail, which crimps the needles until they are deformed; The magazine is partially covered and used as an operating arm, thereby exerting a force on the magazine and the striking knife, and with the magazine and the upper member being movably mounted on a common axis carried by the side members of the base plate. It consists of an upper member.

[0003] In the above-mentioned type of stapler, the stitching is carried out in a series of individual steps, which are carried out below, on the basis of a downward movement of the upper part and the magazine. That is: 1
．． moving the upper member connected to the magazine downward until the magazine contacts the material to be bound;2. Separating the individual needles from the needle strip with a percussion knife and moving the separated needles forward until they contact the material to be stitched;3. 4. Push the needle end into the material to be bound and stick it out;4. The needle end is bent on the back side of the binding material by crimping it onto the die of the substrate.

Depending on the shape of the needle and its connection with the needle strip, as well as the shape and thickness of the material to be stitched, force peaks of various heights are eliminated in the individual working steps; This force peak leads to the following difficulties for the user when operating a conventional stapler with a die: 1. A force of varying strength must be exerted on the operating arm, which suddenly increases during the last step of the downward movement;2. Significant force consumption forces the use of palms or all hands;
Moreover, the various force consumptions are clearly perceptible during the individual steps, and an ergonomically advantageous and simple operation is not possible, for example with only the fingertips of one hand.

[0005]

SUMMARY OF THE INVENTION It is an object of the invention to partially automate the mechanism of a stapler, thereby reducing sudden force consumption and finally simplifying the operation of the device.
It is an object of the present invention to provide a stapler of the aforementioned type having an improved operating mechanism.

[0006]

[Means for Solving the Problems] The means taken to solve the above-mentioned problems are such that the knife is releasably coupled to the striking knife,
The striking knife is temporarily locked in a substantially unchanged position relative to the needle, and a pivotable locking pawl disposed between the upper member and the magazine and tensioned after reaching the unlocked position are used. The invention includes a locking and releasing device consisting of a spring mounted on the percussion knife, which causes a sudden jerk of the percussion knife.

According to the basic idea of the invention, this object is solved by a locking and releasing device belonging to the striking knife, that is to say a detent pawl under the action of a spring, which detent pawl is , the percussion knife is held in a substantially constant position above the needles to be separated from the end of the stapling operation until the beginning of the next stapling operation, and the percussion knife is fixed to the percussion knife during the pressing of the upper member The striking knife in the released position is jerked suddenly onto the needle by the spring force in conjunction with the spring that is tightened by the locking pawl during the gradual release of the needle, and the needle is pushed into the material to be bound, and Make sure to bend the needle end.

[0008]

[Effect of the invention] The stapler formed according to the present invention has
Only uniform and even low forces are required by the user, ie the stapler can be operated only by fingertip pressure, without force peaks, especially in the last working steps.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS From FIG. 1 it is clear the forces required by the user or the many operating steps that occur during a binding operation with a conventional stapler: - until contact with the material to be stapled; - Lowering movement of the operating arm of the (first step) - Separation and lowering movement of the individual needles until they come into contact with the material to be stapled (second step) - Breaking through the material to be stapled (third step) - Bend the needle end on the back side of the binding material (fourth step).

[0010] From this typical depiction, it can be seen that in order to carry out the binding, a particularly large amount of effort is required in the individual operating stages. The condition of returning the operating mechanism to the starting position is shown on the right side of the graph in FIG. 1 as a sudden drop in force.

On the other hand, it can be seen from FIG. 2 that the force used during the binding operation by the stapler of the present invention is extremely small and that it progresses uniformly, that is, there is no force peak.

The stapler with a release mechanism according to the invention, shown in FIG. A punching die 12 is provided at the other end. A magazine 20 for receiving a plurality of needles is coupled to the side member 11 of the base plate 10 by a shaft 13. The magazine 20 consists of a central groove 21 which can be moved into a position in which it can accommodate and guide the needle strip and separate the individual needles G at the ends of the strip from the needle strip.

The magazine 20 further includes a guide web 23.
It also has a guide wall 22 having a . Guide web 23
is located above the separating station in the central groove 21 and approximately perpendicular to this central groove. The guide web receives a vertically movable percussion knife 24 which, during its downward movement, with its underside 54 separates the needle G in the separation station from the needle strip. In this case, the percussion knife presses the needle G into the material to be bound until the end of the needle is permanently deformed by the die 12 of the base plate 10.

Above the magazine 20 is an upper member 30 that is used to transmit forces applied by the user to the magazine 20 and the striking knife 24. A spring 14 is provided between the substrate 10 and the magazine 20 in order to retract the magazine after the binding operation is completed. On the opposite side, a return spring 25 for the upper member 30 is arranged between the magazine 20 and the upper member 30, which in this embodiment is wound around an axis 26.

According to the present invention, the stapler has pins 41;
A release mechanism is provided consisting of a spring 40 secured to the upper member 30 by 42. The rear end of the spring 40 is held by a locking member 43 and a pin 41 located within the magazine 20. The front end of the spring 40 is connected to the striking knife 24
A striking knife 24 is supported within an opening formed therein.

According to the invention, the striking knife 24
3, in which the underside 54 of the striking knife 24 is above the needle G to be separated. In the embodiment shown, this device consists of a locking pawl 45 which is hinged by an axle in the front guide wall 22 of the magazine 20. The shaft 46 is provided with a torsion spring 47 which acts with one end on the magazine 20 and with the other end on the locking pawl 45, so that the torsion spring 47 acts on the locking pawl 45. 45 can be rotated counterclockwise to cause the locking pawl to cooperate with the striking knife. The locking pawl 45 is provided with two projections 48; 49, which are arranged in openings 50; 51 in the striking knife.
to fit. The protrusions 48 and 49 form the respective openings 50 and 5.
1, the protrusion locks the striking knife 24 in a predetermined upper position above the needle G, regardless of the tension of the spring 40.

[0017] The upper member 30 is provided with a protrusion 52;
The projection exerts pressure on the upper free end 53 of the locking pawl 45 when the upper member is moved downwardly.

The functioning of the locking and unlocking mechanism described above according to FIG. 3 is illustrated in FIG.
are described below with reference to A-F.

In FIG. 5A, the stapler is in the rest position. Spring 40 is untensioned. The protrusion 48; 49 of the locking pawl 45, which is tensioned by the torsion spring 47, lies in the opening 50; 51 of the percussion knife 24, so that the percussion knife is held above the needle G. The protrusion 52 of the upper member 30 does not contact the free end 53 of the locking pawl 45 .

In FIG. 5B, the binding operation is performed using the upper member 30.
introduced by pressure on the anterior end of. Return spring 25
As a result, the upper member 30 presses the magazine 20 (not shown here) downwardly to the material to be bound.

Further pressure exerted on the upper member is shown in FIG.
As shown in FIG. 5C and FIG. 49 are now gradually pulled out of the respective openings 50; 51 of the percussion knife 24.

When the projections 48; 49 are completely outside the openings 50; 51, the striking knife is no longer locked, so that the spring 40 is relaxed and suddenly strikes the striking knife towards the needle G (FIG. 5). E). The dimensions of the individual members are designed such that the energy collected in the tensioned spring is sufficient to cause the needle to penetrate and penetrate the material to be stitched. Furthermore, the ends of the needles G on the back side of the binding material are bent by the die 12.

Finally, when the user of the stapler has finished pressing on the upper part 30, the return spring 25 guides the upper part 30 back into its starting position with respect to the magazine 20 (FIG. 5F). . Protrusion 48 on locking claw 45
49 is again locked in the opening 50; 51 of the striking knife;
Lock the striking knife in position above the new needle G. On the other hand, the magazine 20 is moved again under the action of the spring 14 in FIG.
and assumes a predetermined starting position corresponding to A in FIG. 5, so that the device is prepared for a new stitching operation.

The striking knife 24 is held in a substantially fixed position with respect to the needle G to be separated by a locking pawl 45. This position maintains the percussion knife from the end of the stitching operation (FIG. 5A) until the release of the next stitching operation (FIG. 5D; 5E). In this almost fixed locking position,
The lower surface 54 of the striking knife 24 remains above the needle G. In this case, the expression "substantially stationary" does not prevent slight changes in the position of the striking knife caused by displacement and movement of other parts of the stapler. This applies in particular to the movements of the protrusions 48; 49 when they enter or exit the corresponding openings 50; 51.

The force used during operation of the stapler is
In fact, limited to the tension of the spring 40, the force required for the movement of the return spring can be neglected in this case. The force expended by the user is completely independent of needle characteristics, such as how much force is required to separate the needle from the needle strip or to deform the needle end. .

FIG. 2 graphically depicts the force required to move the upper member 30, which shows that the force consumed is approximately constant compared to a conventional stapler (see FIG. 1); That is, it can be seen that no impulsive force curve is shown as in the conventional device. The graph according to FIG. 2 is less representative than the graph of FIG. 1 due to the forces acting on the needle.

[0027] The fact that the force expended by the user to operate the stapler, as in the present invention, is independent of the force always acting on the needles makes special use of the various components of the stapler's release mechanism. It has the significant advantage that it can be designed for conditions such as heavy or light materials to be bound. This means that it can be manufactured for light materials to be bound;
The spring 40 can be designed to be weak enough to operate the stapler with just the pressure of the fingertips of an outstretched hand. Conventional staplers cannot even staple thin sheets of paper.

In the stapler according to the embodiment, magazine 2
0 receives the needle strip in a slide rail provided in the front part of the device. However, the present invention provides for other staplers of conventional type irrespective of the shape of the charge, for example placed in a stationary, i.e. non-extractable, supply rail in the lower part of the magazine, after which the upper part is released from the lower part. Also used for staplers.

[0029] The special structure and configuration of the release mechanism can achieve the above-mentioned advantages of reducing costs, since only minor changes are required to incorporate the release mechanism into a conventional stapler. Particularly advantageously, after the release of the locking pawl and the release of the stitching operation, manual back-stitching can additionally be carried out.

[Brief explanation of the drawing]

FIG. 1 is a graph showing the force unconditionally exerted by a user during a stapling operation in a conventional stapler.

FIG. 2 is a graph showing the unconditionally exerted force for a stapler according to the invention;

FIG. 3 is a partially cutaway perspective view of the stapler.

FIG. 4 is a detailed enlarged view of FIG. 3;

FIG. 5 is a schematic diagram showing various steps of a binding operation.

[Explanation of symbols]

10 substrate, 11 side member, 12 punching die, 13 shaft, 14 spring, 20 magazine, 21 central groove, 22 guide wall,
23 guide web, 24 striking knife,
25 return spring, 26 shaft, 30 upper member, 40 spring, 41, 42 pin, 4
3 locking member, 44 opening, 45 locking claw,
46 Axis, 47 If you twist it, 48,
49 protrusion, 50, 51 opening, 52
protrusion, 53 free end, 54 lower surface

Claims (6)

[Claims] 1. A manual stapler, especially for binding small paper piles or similar objects made of paper, comprising:
a magazine having a base plate, a stamping die disposed on the base plate, and a magazine pivotably supported in a side member at an opposite end and partially covered by an upper member acting as an operating arm; and the magazine is provided with a central groove for receiving and guiding the needle strip and for receiving a striking knife positioned substantially perpendicular to the central groove and sliding up and down for separating and driving the needles. In the type formed by a guide web, the striking knife (24) is releasably connected to the striking knife (24).
4) temporarily locked in a position that hardly changes with respect to the needle (G), and a pivotable locking pawl (45) disposed between the upper member (30) and the magazine (20); It has a locking and releasing device consisting of a spring (40) supported on the striking knife (24), which is tensioned after reaching the unlocking position and causes a sudden jerk of the striking knife (24). A manual stapler characterized by: [Claim 2] The locking claw (45) is attached to the guide wall (22).
2. The manual tool according to claim 1, further comprising a torsion spring (47) disposed on the same shaft and operatively connected to a torsion spring (47) which presses the locking pawl onto the striking knife (24). Stapler. Claim 3: The striking knife (24) of the locking claw (45)
) is provided with protrusions (48; 49) on the side facing
The protrusion forms an opening (50; 51) in the striking knife (24).
3. A manual stapler as claimed in claim 1 or 2, in which the percussion knife is locked in the opening in the locking position under the action of a torsional spring (47). 4. The spring (40) is designed as a helical leg spring, one leg of which is seated in the opening (44) of the percussion knife (24), and the other leg of the helical leg spring mounted in the magazine. (20), and the spring coil portion is held on the upper member (30) via a pin (41; 42). Manual stapler as described. 5. The upper member (30) has a locking claw (45).
From claim 1, the free end (53) has a protrusion (52) at the height of the free end (53) for gradually pivoting the locking pawl into the unlocked position while simultaneously tightening the spring (40). A manual stapler according to any one of items 4 to 4. 6. The percussion knife (24) has an extension by means of which it projects beyond the end face of the guide wall (22) in the zero position. The manual stapler described in (1) above.