JPH0546862Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a stapler in which a straight staple needle is formed into a U-shape and then driven into the material to be stapled, to prevent the staple needle from falling during forming. This invention relates to a staple roll prevention device.

(Prior art and its problems) A sheet-like staple made by connecting straight unformed staples in a sheet-like manner with an adhesive is fed forward along a feeding path, and from the unformed staple needle at the front. In a stapler that sequentially forms a staple into a U-shape and then drives it in, a mechanism is adopted in which each time a formed staple is driven, one staple after it is formed into a U-shape. When the formed staple is driven, the adhesive between the rear end surface of the formed staple needle and the front end surface of the unformed staple needle connected behind it is severed and separated, and immediately after that, the unformed staple needle is driven in. is formed. In this way, just before the unformed staple needle is formed, its front portion is drawn in in the direction of staple driving, and is therefore subjected to a force that causes it to fall forward. Usually, the above-mentioned unformed staple needle is further supported by an unformed staple needle connected behind it, and there is only a small clearance between the sheet-like staple and the feeding path, so that the unformed staple needle is driven. The unformed staples behind the formed staples do not fall over easily.

However, when the second to last formed staple of the sheet staple is driven by the driver plate 3, the last unformed staple 1a connected thereto is connected and supported by other unformed staples. Because there is no head, it is easy to fall forward (see Figure 9). If molded in a fallen state, molding defects will occur, and good driving may not be possible, resulting in clogging in the magazine, making removal processing extremely difficult. In order to prevent this, it may be possible to reduce the clearance between the feed path and the sheet staple, but this is actually extremely difficult as it would require improving the machining accuracy and assembly accuracy of the parts. .

(Technical Problems of the Invention) The present invention solves the above-mentioned drawbacks and provides a staple fall prevention device that can prevent the staple from falling during forming and achieve good binding without particularly increasing precision. The technical challenge is to do so.

(Means for Solving the Problems) In order to solve the above problems, a device for preventing staples from falling in a stapler according to the present invention is provided by connecting straight unformed staples in a sheet form to a magazine of a stapler. a forming plate that sequentially presses both sides of the sheet-like staple starting from the front staple to form a U-shape; a driver plate that drives out the formed staple;
A driving path that receives only one formed staple needle, a supply mechanism that supplies the formed staple to the driving path, and a driver plate that drives the formed staple needle in the driving path along the driving path. Additionally, the molded plate is formed to have a thickness that allows it to engage with both sides of at least two unformed staples.

(Operations and Effects of the Invention) As described above, according to the present invention, at least two staples are formed at a time by the forming plate, and only one of them at the forefront is supplied to the driving path. By the time the penultimate staple of the shaped staple is driven by the driver plate, the last staple has already been formed. Therefore, when the penultimate staple is driven and separates from the last staple, the last staple is pulled in the driving direction and is subjected to a force in the direction of falling forward; The staples are already shaped so they won't fall over. Therefore, the practical effects of the present invention are very large.

(Example) Hereinafter, an example according to the present invention will be described with reference to the drawings.

1-3 show the front end of a magazine in a stapler. At the front end of this magazine, a forming plate 2 is formed by rolling down both sides of the sheet staple 1, which is formed by connecting straight unformed staple needles 1a in a sheet shape, starting from the front staple needle and forming it into a U-shape. , a driving passage 4 that receives only one formed staple needle 1b, a supply mechanism (pusher) that supplies the formed staple needle 1b to the driving passage 4, and a driving passage 4 that receives only one formed staple needle 1b, A driver plate 3 for driving along the driving path 4 is provided. Note that the driving path 4 is, as described later,
It is formed on a front wall 11 (see FIG. 2a, for details, FIGS. 4a, b to 8a, b) provided on the nearer side of the driver plate 3 in FIG. 1.

As shown in FIG. 3, the sheet-like staples 1 are supported on stepped support portions 5 formed on both inner walls of the magazine, and formed between the support portions 5 and a guide wall 6 above the support portions 5. It is fed forward along the feed path 7. This feeding device may be composed of a feeding belt 8 disposed at the lower part of the feeding path 7 on which the sheet-shaped staple 1 is placed, a magnet 9 which presses the sheet-shaped staple 1 onto the feeding belt 8, and the like.

Forming protrusions 2a are formed on both sides of the forming plate 2, and are provided so as to be moved downward from above an anvil 10, which is formed to protrude forward from the center of the lower front end of the feed passage 7, by a driving means (not shown). When the molding protrusion 2a is moved downward from both sides of the anvil 10, it moves downward.
As a result, when the forming plate 2 is driven downward, the forming protrusion 2a presses down both sides of the unformed staple needle 1a on the anvil 10, forming it into a U-shape.

By the way, the molded plate 2 is formed to have a thickness that allows it to engage with the two unformed staple needles 1a. Similarly, the protrusion width of the anvil 10 is approximately equal to the width of two unformed staple needles 1a (see Fig. 2a).
), the width is approximately equal to the length of the crown portion of the staple needle to be formed.

The driving path 4 is formed in the vertical direction on the back surface of a front wall 11 that is formed upright in front of the feeding path 7 for the sheet-like staple 1. In addition, the feed passage 7
The width of the driving path 4 is approximately equal to the length of the unformed staple needle 1a, while the width of the driving passage 4 is approximately equal to the length of the crown portion of the formed staple needle 1b (Figs. 4a, b to 8). (See Figures a and b). Therefore, the sheet-like staple 1 fed along the feeding path 7 is not fed into the driving path 4 before forming.

Next, as shown in FIG. 2a, below the front end of the feeding path 7 of the sheet-like staple 1, there are formed staple needles 1b formed by the forming plate 2.
A pusher 12 is provided for sending out the drive path 4 into the driving path 4. Pusher 12 is always urged forward by elastic means 13. Therefore, when forming the unformed staple 1a, the pusher 12 engages with the lower end of the descending forming protrusion 2a via the unformed staple 1a. Since the upper surface of the pusher 12 that engages with the molding protrusion 2a is rounded,
The forming plate 2 descends and unformed staples 1a
As shown in the figure, when the pusher 12 continues to descend after being engaged with the unformed staple 1a, the pusher 12 resists the urging force and the moving range is formed by the forming protrusion 2a. The width is set to correspond to the width of two staples.

Note that when the molding plate 2 rises again after being lowered, the engagement with the pusher 12 is released, so that the pusher 12 is pushed forward again by the elastic means 13 (see FIG. 2B).

The driver plate 3 is provided so as to be movable up and down along a driving path 4 formed on the back surface of the front wall 11, is held in an overlapping state with the forming plate 2, and is driven by the driving means. be.

Next, the operation mode of the magazine having the above structure will be explained with reference to FIGS. 4a, b to 8a, b.

First, the sheet staples 1 loaded in the magazine are fed to the front end of the feeding path 7 by a feeding device. At this time, the two unformed staples S1 and S2 at the forefront are located on the anvil 10 (see FIGS. 4a and 4b). Here, when the forming plate 2 and the driver plate 3 are actuated by the driving means, the forming plate 2 moves downward, and its forming protrusion 2
The leading ends of a are engaged with both sides of the two frontmost staples S1 and S2 of the sheet-like staple 1, and press the both sides. Since the center portions of these two staples S1 and S2 are supported by the anvil 10, both sides are bent and the whole is formed into a U-shape, and the pusher 12 is formed into a forming protrusion as described above. It retreats rearward due to the pressing force of the piece 2a. At the same time, the driver plate 3 is also driven downward along the driving path 4, but since the staples are not fed into the driving path 4, the driving is blank (see FIGS. 5a and 5b).

Next, after forming, the forming plate 2 moves upward to its original position, so that the pusher 12 is pushed forward.
At this time, it engages with the legs of the shaped staple S2 and supplies the foremost shaped staple S1 of the shaped staples into the driving path 4 (sixth
(See Figures a and b). In this way, the two forming staples S1 and S2 described above are fed forward by one length by the pusher 12, and at the same time, the sheet-like staple 1 is fed forward by one length.

Furthermore, when the driving means is reactivated, the driver plate 3 is driven as shown in FIGS. 7a and 7b, so that the foremost formed staple S1 that was previously sent into the driving path 4 is driven out of the magazine. . The fired shaped staple S1 is disconnected from the subsequent staple and driven into the material to be bound. The forming plate 2 is also driven at the same time as the driver plate 3, and its forming protrusion 2a is moved to the anvil 10 immediately after the foremost forming staple S1 is separated from the second forming staple S1.
It engages and presses the upper staples S2 and S3. On the anvil 10, in addition to the second staple S2 from the frontmost part of the sheet-like staple 1, a third unformed staple S3 is newly placed on the anvil 10.
Since the unformed staple S3 is also newly formed by the forming plate 2, the formed staple S2 is again subjected to the action of the forming plate 2, so that it is shaped into a better shape.

When the forming plate 2 and driver plate 3 move upward after the forming and driving operations are completed, the pusher 1
2, the sheet-like staple 1 is fed by one staple needle, and the foremost formed staple needle is fed into the now empty driving path 4.

Thereafter, the forming and driving operations are repeated in the same manner, and the last two of the sheet staples 1 are
When the th forming staple S10 is driven and the adhesive connecting it to the last staple is cut, the front end of the last staple S11 is pulled in the firing direction, so that the staple has a tendency to fall forward. force is applied. However, as shown in FIGS. 8a and 8b, the last staple S11
has already been molded and its legs are pressed against the pushers 12, so it will not fall over.

As described above, two staples are formed at a time by the forming plate 2, so that by the time the second to last staple of the sheet staple 1 is driven, the last staple has already been formed and the pusher has already been formed. Since it is supported under pressure by 12, it is prevented from falling over.

Note that the forming plate 2 may form three or more staples at a time, and does not necessarily need to form two staples as in the above illustrated example.

[Brief explanation of the drawing]

Fig. 1 is a front view of a device for preventing the staple from falling in a stapler according to the present invention, Fig. 2 a and b
1 is an explanatory diagram of the forming and driving mode of the staple needle in a cross section taken along the line X-X in FIG. 1, and FIG.
It is a cross-sectional view on the Y-Y line of Figure a, and Figure 4
- Figures 8a and 8b are side and plan views of the manner in which staples are formed and driven, respectively, and Figure 9 is an explanatory view of the manner in which conventional sheet-shaped staples are driven. Symbols...1... Sheet-like staple, 2... Forming plate, 3... Driver plate, 4... Driving passage, 7... Feeding passage, 10... Anvil.

Claims (1)

[Scope of utility model registration request] A forming plate is formed by connecting straight unformed staples in a sheet form in a stapler magazine, and forming the sheet staple into a U-shape by pressing down both sides of the sheet staple in order from the front staple needle. a driver plate for driving a staple; a driving passage for receiving only one formed staple; a supply mechanism for supplying the formed staple to the driving passage; and a driver plate for driving the formed staple in the driving passage. and a driver plate for punching out along the same direction, and the molded plate is formed to have a thickness capable of engaging with both sides of at least two unformed staples. Device.