JPH0354861Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention involves continuously punching and feeding straight unformed staple material, and forming the levered staple material into a U-shape prior to driving. This invention relates to a forming mechanism for a staple material for a stapler that is used to punch out and staple paper.

(Prior art and its problems) In the staple forming mechanism of a conventional general stapler, as shown in FIG. Guide side walls 12 formed in the left-right direction
The sides are regulated and supplied by. The material S is formed into a U-shape by a forming plate 13 equipped with a concave mold 14 that faces downward and is symmetrically formed at the tip of the supply path. .

In the forming mechanism 10 having the above configuration, the dimension between the left and right guide side walls 12, 12 is the staple material S.
The width dimension of the staple material S is set to be slightly larger than that of the staple material S in order to lubricate the supply of the staple material S.
It can be said that it is at an undefined position between 2 and 12. For example, when the material is arranged biased toward one guide side wall 12, if it is formed by the forming plate 13 described above, the length dimension of the left and right staple legs will be a predetermined value for one leg S2. The staple leg S1 is formed to be shorter than the specified dimension, and the other leg S1 is formed to be longer than the predetermined dimension, which causes buckling of the staple leg during the next punching process, causing it to become stuck inside the stapler and malfunction. Also, as shown in FIG. 5, one leg after the paper is bound, that is, the longer leg S1, breaks through the paper and protrudes further above the crown portion S3 of the staple. This was a cause of so-called re-penetration.

(Technical Problems of the Invention) The present invention solves the problems of the prior art described above, and when forming a staple material located at an arbitrary position on a supply path into a U-shape using a forming plate,
By moving the staple material in a predetermined direction by the forming operation of the forming plate,
It is an object of the present invention to provide a staple forming mechanism in which the lengths of both legs are always the same after forming.

(Technical means of the invention) The technical means of the invention to achieve the above object is to make the portions that contact the shoulders of the staple material different on the left and right sides when the staple material is formed by the forming plate. This forcibly moves the staple material in a predetermined direction. That is, the inner lower edges of the concave mold formed corresponding to the anvils of the forming plate form the shoulders of the staple at different stroke positions of the forming plate. It is characterized in that the positions of the portions that come into contact with the shoulder portions are formed at different positions, and the distance between the guide side wall on the side where the staple material moves and the anvil is set to a predetermined leg length dimension. be.

(Operation of the invention) When a linear staple material is formed by the forming plate, the material is first moved to the side that contacts the shoulder of the staple, and the end of the material hits the guide wall. A predetermined leg length dimension is thereby set. Therefore, no matter where the staple material is located in the supply path, the legs of the staple after forming can be kept approximately the same, and problems such as buckling and re-penetration during paper binding can be eliminated. It is possible.

(Embodiment of the invention) Next, an embodiment of the invention will be described based on the drawings. 1 and 2 show a staple forming mechanism 20 according to an embodiment of the present invention.

The staple material S is in the form of a straight line having a predetermined length, and a large number of the staple materials S are adjoined to each other and connected by adhesive to form a sheet-like structure as a whole. This sheet-shaped staple material S has a guide rail 21 configured inside the stapler,
21 and guided by guide side walls 22, 22 formed on both left and right sides, the stapler is supplied to a forming mechanism provided at the front end of the stapler by a supply mechanism 23 such as an endless belt. The forming mechanism includes an anvil 24 which is arranged on the lower side of the sheet-like staple material and serves as a male mold when forming the staple material into a U-shape, and an upper side of the staple material opposite to the anvil 24. and a forming plate 25 that is arranged at the top and driven in the vertical direction by a drive mechanism (not shown), and the forming plate 25 cooperates with the anvil 24 to coat the staple material. A concave mold 26 that serves as a female mold when molding into a letter shape is
It is formed facing downward in correspondence with the anvil 24. As shown in detail in Figure 2A,
The concave mold 26 has vertical sides 26c separated by a distance equal to the width of the shoulder of the staple after molding.
26c, and the vertical side 26.
Lower end sides 26b, 2 that are continuous with the lower end of each of c, 26c and slope downwardly toward the outer side of the respective lower end sides 26b, 26c
6b, and further includes vertical sides 26c, 26c and a lower end side 26 of the recessed portion 26a.
The joint edges of b and 26b are formed with curved surfaces having different curvatures. For example, in FIG. 2, the right joint edge 26e is a curved surface with a radius of 1 mm, and the left joint edge 26d is a curved surface with a radius of 2 mm.

Furthermore, the edge portion 2 constituted by the curved surface with the small radius
The distance between the anvil 24 and the guide wall 22 on the side 6e is set to be the same as the leg length of the staple when it is normally formed. still,
S' is a staple formed into a U-shape in advance in a process, and 27 is a driver member that drives out the formed staple S' through the bound paper toward the clincher 28 disposed below the paper.
The tips of both legs of the staple are attached to this clincher 28.
The guide grooves 28a formed in the guide grooves 28a guide the guide toward each other and bend the guide grooves.

Next, the operation of the above structure will be explained with reference to FIGS. 2A to 2E.

FIG. 2A shows a state in which the staple material S is supplied to the position of the forming mechanism, and the staple material S in this state is at an unspecified position between the guide side walls 22, 22 on both sides. The forming plate 25 is lowered by a drive mechanism (not shown), and the inclined lower end sides 26b, 26b respectively abut near both ends of the staple material S and begin to bend downward (see FIG. 2B). As the forming plate 25 further descends, the edge 26e formed with a curved surface with a small radius approaches the shoulder of the anvil 24, acting as if squeezing the staple material S interposed between the edges 26e and moving the staple material toward the right in the figure. This creates an effect that attracts people towards. At this time, the other side, that is, the side of the edge 26d formed with a curved surface with a large radius, is still the edge 26d.
Since there is a gap between the shoulder portion of the anvil 24 and the shoulder portion of the anvil 24, movement of the staple material S is not hindered. The tip of the staple S that has moved to the right in the figure comes into contact with the inner surface of the guide side wall 22 and stops moving, and in this state, the staple material is arranged approximately evenly with respect to the anvil 24 and forming plate 25. (See Figure 2C).

After this, when the forming plate 25 further descends, the edge 26d formed with a curved surface with a large radius presses the staple material S between it and the shoulder of the anvil 24, and at the same time, the edge 26e on the other side presses the staple material S. The edge 26d then bends the other end of the staple material at 90 degrees to form the other leg (see Figures 2D and E). ).

FIG. 3 shows another embodiment of the forming plate constituting the forming mechanism of the present invention. The forming plate 35 has the anvil 24
A concave mold 36 that serves as a female mold when forming the staple material S into a U-shape in cooperation with the anvil 2
4, and the concave mold 36 has vertical sides 36 having the same spacing as the width of the shoulder of the staple after molding.
c, 36c, and lower end sides 36b, 36b that are continuous with the lower ends of the perpendicular sides 36c, 36c and sloped diagonally downward in the outer direction of the respective recesses 36a. Furthermore, the bottom edge 3 of both of the above
6b, 36b are formed with different inclination angles, so that the joining edges of the respective vertical sides 36c, 36c of the recessed portion 36a and the lower end sides 36b, 36b are shifted in the operating direction of the forming plate 35. has been formed.

Even when the forming plate 35 according to this embodiment is used, it is possible to set the lengths of the staple legs after forming to be substantially equal by the same operation as in the previous embodiment.

(Effects of the invention) As described above, according to the invention, when the forming plate performs the forming operation, the staple material is moved to a predetermined position in a predetermined direction before being formed. The length of the staple leg can be kept constant even when the staple leg is supplied, and there is no possibility of buckling during paper binding or so-called re-penetration in which the tip of the leg penetrates the paper and protrudes to the top surface.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of the present invention;
2A to 2E are operation explanatory diagrams showing the states of each stage according to the same embodiment, FIG. 3 is a front view showing a forming plate according to another embodiment, and FIG. 4 is a front view showing the prior art of the present invention. FIG. 5 is a perspective view showing a state of binding formed staples according to the prior art. 20... Forming mechanism, 21... Guide rail, 2
2... Guide side wall, 23... Supply mechanism, 24...
Anvil, 25... Forming plate, 2
6, 36...Concave mold, 26a, 36a...Concave portion, 26b, 36b...Lower edge, 26c, 36
c... Vertical side, 26d, 36d, 26e, 36e
... Edge, 27 ... Driver, 28 ... Clincher, 28a ... Guide groove.

Claims (1)

[Scope of utility model registration request] A feeding mechanism that includes guide side walls that regulate both sides in the longitudinal direction of a straight unformed staple material and feeds and guides the staple material toward a forming section, and a staple material that is arranged at a front end of the feeding mechanism to be fed. a forming mechanism that bends and forms the staple into a U-shape; a driver mechanism that drives out the staple after the forming has been formed; and a clincher that engages with the tips of the staple legs that penetrate the sheet and bends the legs toward each other. In the stapler, the forming mechanism includes an anvil member disposed on the lower surface of the staple material, and a forming plate having a concave mold disposed above the staple material and facing the anvil member. The forming plate is arranged such that both edges of the inner lower side of the concave mold formed corresponding to the anvil form the shoulders of the staple at different stroke positions of the forming plate. The forming plate is formed with different positions of the portions that contact the forming plate, and the distance between the guide side wall and the anvil on the side where the shoulder portion of the staple is first formed during the downward stroke of the forming plate is set to a predetermined leg length dimension. A staple forming mechanism characterized in that it is set so as to.