JP4830476B2 - Stapler - Google Patents

Description

  The present invention relates to a stapler for binding sheets used in offices and the like, and more particularly to a stapler having a structure effective for preventing two staples from being simultaneously fired.

  Conventionally, an outer handle and an inner handle, each of which can be pivoted at pivot points at different ends, are linked to each other via a coupling member constituting one booster mechanism. 2. Description of the Related Art A stapler is known that uses a boosting effect of a connection structure to reduce an operation force in a binding operation of a large number of stacked sheets (see, for example, Patent Documents 1 and 2). These are medium and large staplers, but like a normal stapler, the inner handle is provided with a driver plate, and this driver plate is operated so as to penetrate the front end of the magazine provided below the inner handle. Of the connected staples loaded in the magazine, the leading staple is driven downward to bind the paper.

However, medium- and large-sized ones often use staples having long legs, so that the staple driving stroke is long and the driver plate must be long. For this reason, in the structure in which the driver plate is fixed to the inner handle, the driver plate bends when the driver plate is driven out (during forward movement) and when it is pulled out (during backward movement). It is more convenient to attach it to the handle so that it can move to some extent.
JP 2005-138248 (Page 9, FIG. 2) JP-A-2005-138247 (4th page, FIG. 2)

  However, if the driver unit moves freely, the driving angle of the driver plate is not stable when the driver plate is driven, so that the tip of the driver plate is misaligned, and the staple located at the forefront and the next staple Sometimes, two simultaneous strikes are invited. Further, when the driver plate returns upward, the sliding friction with the front wall of the magazine increases, which may cause the driver plate to be pulled out of the magazine and cause the magazine to be lifted. Therefore, provision of a suitable measure for solving such a problem is demanded.

  The present invention relates to a proposal for an improved structure of a stapler suitable for a large-sized stapler, which solves the above-described problems and has a particularly long driver plate, and mainly prevents double stapling of staples. The challenge is to provide a stapler that can do this.

  In order to solve the above-mentioned problem, the stapler of the invention according to claim 1 is configured such that the driver plate is fixed to the front end of the driver holder inside the front end of the handle in which the upper plate and both side plates are formed in a U-shape with a downward opening. A magazine containing staples is disposed below the handle, the handle and each rear end of the magazine are coaxially mounted, and the handle is pushed down so that the driver plate holds the inside of the magazine. A stapler that drives out the leading staple of the paper and binds the paper, wherein the arm portions protruding from both side portions of the driver holder are loosely fitted into the engagement holes formed on both side plates of the handle, and at the initial stage when the handle is pushed down, The rear upper end of the driver holder is brought into contact with the upper inner surface of the handle so that the front end side of the driver plate And wherein the tilting of the front side.

  According to a second aspect of the present invention, the arm portion of the driver holder is tilted so that the lower edge of the engagement hole of the handle can be guided forward when the handle returns and moves upward after the end of the spelling. It is characterized by that.

  Further, in the invention according to claim 3, after the front end side of the driver plate abuts on the leading staple, the front upper end of the driver holder abuts on the upper inner surface of the handle, and the driver plate is It is characterized by being along the front wall of the magazine.

  According to the first aspect of the present invention, when the handle is pushed down, the upper end of the rear portion of the driver holder comes into contact with the inner surface of the upper portion of the handle, so that the driver holder rotates to the front end portion of the driver plate. The force to move moves and hits the front wall of the magazine. For this reason, the said front-end | tip part contact | abuts reliably with the crown part of a front staple. Accordingly, since only the leading staple is punched out, it is possible to reliably prevent double punching.

  According to the second aspect of the invention, the lower edge portion of the engagement hole of the inner handle that engages with the arm portion of the driver holder is inclined, so that when the handle returns and moves upward after the end of the spelling. In addition, the arm portion is slidably guided forward along the lower edge. For this reason, the driver plate can rise along the front wall of the magazine. In this way, even if the driver holder is tilted at the end of the spelling, the posture is corrected, so that the contact pressure between the driver plate and the magazine front wall is reduced and sliding friction is reduced, and the magazine front wall of the driver plate is reduced. It is possible to prevent the magazine from being lifted, and to ensure a smooth return of the driver plate.

  Further, according to the invention of claim 3, after the front end side of the driver plate comes into contact with the leading staple, the front upper end of the driver holder is brought into contact with the upper inner surface of the handle so that the driver plate is placed in front of the magazine. Since it is along the wall, the rear upper end and the front upper end of the driver holder are brought into contact with the upper inner surface of the handle, and the leading staple can be driven out reliably in a stable state.

  FIG. 1 is a perspective view of a stapler according to the present invention, and FIG. 2 is a longitudinal sectional view thereof. In the figure, reference numeral 1 denotes a base table. A binding base 11 on which paper is placed is provided on the front half side of the base base 1, and a magazine guide 11a and a handle support plate 11b are erected on the end part on the rear side. The magazine 2 and the inner handle 3 are pivotally supported by a first support shaft 6 provided in the magazine guide 11a. An outer handle 4 for driving the inner handle 3 is rotatably provided on the second support shaft 7 provided on the handle support plate 11b.

  The magazine 2 has a space for storing the staples S connected therein, and a punching portion 21a is formed at the front end thereof. A staple pusher 27 is disposed inside the magazine 2 to press the connected staple S toward the launching portion 21a.

  A driver unit 30 is held at the tip of the inner handle 3.

  The outer handle 4 drives the inner handle 3. The outer handle 4 is formed by integrally joining two handle members 4a and 4b, which are long and short, and the outside is covered with a resin cover 41. A guide groove 42 that bends in a gentle S-shape is formed on the side surface of the shorter handle member 4b, and the drive shaft 33 protruding from both sides of the inner handle 3 is engaged with the guide groove 42 in this way. The booster mechanism is configured by increasing the ratio of the distance between the action point (q) and the force point (r) with respect to the fulcrum (p) of the outer handle 4.

  When the outer handle 4 is pushed down, the inner handle 3 and the driver plate 32 of the driver unit 30 are driven downward together with the drive shaft 33 engaged with the guide groove 42, and the leading staple supplied to the leading end of the magazine 2 is ejected. Launched from 21a. The staple leg passes through the paper a placed on the binding table 11 and is further pressed and bent by the clinch groove 11d provided on the binding table 11, thereby binding the paper a. When the binding operation is completed, the magazine 2, the inner handle 3, and the outer handle 4 are returned to the initial state of FIG. 1 by the first spring 25 and the second spring 34, and the staple is pushed to the launching portion 21 a by the staple pusher 27. Only one is sent and the next spell is prepared.

  According to the stapler having the above-described configuration, even if the force for pushing down the outer handle 4 is light, a driving force much larger than when the driver plate 32 is pushed down directly by the inner handle 3 can be obtained, which is suitable for binding a large number of sheets. .

[Two-stroke prevention mechanism and driver plate return movement mechanism]
By the way, the stapler is provided with a driver plate return movement mechanism for smoothly returning the inner handle after binding, as well as a two-stroke preventing mechanism for preventing two staples from being simultaneously fired at the time of binding.

  That is, the inner handle 3 is a member obtained by bending an upper plate 3a made of a sheet metal material such as a steel plate and both side plates 3b into a substantially U-shape with a downward opening, and the front end upper inner surface 3a1 is bent downward. A driver unit 30 having a driver plate 32 for driving the staple S during the binding operation of the above-described paper is attached to the front portion of the magazine 2 having substantially the same length. An engagement hole 3b4 is formed in the front portion of the side plates 3b.

  The driver unit 30 is attached to the distal end portion of the inner handle 3 as shown in FIGS. 3 and 7 to 10 and the like, and is formed by integrally connecting a driver holder 31 and a driver plate 32. The side plate 31b and the front plate 31a, which are substantially horizontally oriented, have a substantially U-shape in plan view, and are formed by bending a sheet metal material such as a steel plate having a predetermined thickness.

  The upper edges 31b1 of the both side plates 31b are formed as a partially straight portion that is substantially orthogonal to the front plate 31a and a tapered portion that is inclined downward as it goes rearward from the partially straight portion, and a lower portion 31b2 is formed on the front plate 31a. It is formed as a straight portion that is substantially orthogonal.

  The front plate 31a has a substantially rectangular shape when viewed from the front, and the upper portion 31a1 of the front plate 31a protrudes slightly above the upper edge 31b1 of the side plates 31b, and this upper portion 31a1 cooperates with the upper edge 31b1 to be described later. It has a suitable shape that contributes to contact with the front end upper inner surface 3a1 of the front end portion of the inner handle 3 when the staple is driven. A pair of arms 31A having a predetermined length are formed on both sides of the substantially central portion of the front plate 31a.

  Each of the protruding bases of the pair of arm portions 31A is provided with a press-molded dowel 31a2 having a small protruding amount. One caulking hole 31a3 is provided at a position slightly below the center of the front surface of the front plate 31a. The driver plate 32 is attached to the driver holder 31 by the dowels 31a2 and caulking holes 31a3 having a small protruding amount.

  The driver plate 32 is a plate-like member formed in a substantially rectangular shape in a plan view by punching with a press as an example of a sheet metal material such as a relatively thin steel plate, as shown in FIGS. 9 (a) and 9 (b). In addition, two arc-shaped notches 32a that are used for positioning and holding when the driver plate 32 is attached to the driver holder 31 are formed at symmetrical positions on both the left and right sides of the upper part. A caulking hole 32b for fixing to the driver holder 31 is formed at a slightly central position on the lower plate surface between 32a.

  A substantially rectangular hole 32c which is long in the vertical direction is formed below the plate surface of the caulking hole 32b.

  The driver plate 32 is attached to the driver holder 31 by applying the driver plate 32 from the front outer side of the front plate 31a of the driver holder 31 as shown in FIGS. The pair of arc-shaped notches 32a formed above the left and right side edges of the front plate 31a are fitted into a pair of small dowels 31a2 provided on the left and right side edges of the arm 31A corresponding to the protruding base part. The caulking member such as the rivet R is inserted into the caulking hole 32b in the center of the upper plate surface of the driver plate 32 and the caulking hole 31a3 of the front plate 31a of the driver holder 31 and is caulked integrally. 30 is formed.

  The driver unit 30 configured by caulking the driver holder 31 and the driver plate 32 integrally with each other includes a long portion in which the driver plate 32 extends downward from the lower surface of the driver holder 31, and this extended end is already present. The tip portion 32d described above is used.

[Mounting the driver unit to the inner handle]
Next, as shown in FIG. 10, the driver unit 30 connects the distal end portions 31 </ b> A <b> 1 of the pair of arm portions 31 </ b> A projecting from both sides to the front portions of the both side plates 3 b that are U-shaped in the downward direction in cross section of the inner handle 3. It is supported by loosely fitting into the respective engagement holes 3b4. A front end upper inner surface 3a1 (see FIG. 4A) of the inner handle 3 is bent and protrudes downward, and a stapler is provided between the protruding portion of the front end upper inner surface 3a1 and the upper portion of the driver unit 30. In the standby state (see FIG. 5E), there is a predetermined gap. Therefore, the driver unit 30 can move freely within a certain range. Moreover, as shown in FIG. 6, the lower edge front half 3b42 of the engagement hole 3b4 is inclined forward and downward.

  As shown in FIGS. 7A and 10, the opening width of the hole 32c of the driver plate 32 is gradually narrowed downward, and a protruding portion in the plate width direction is provided at the leading end portion 22a1 of the staple cover 22. If formed, the driver plate 32 can be provided so as to be movable only between the protruding portion and the front end of the side plate portion 22 b of the staple cover 22. The staple cover 22 is pivotally attached to the second support shaft 6.

  The staple cover 22 is formed in a U-shaped cross section by an upper plate portion 22a and a side plate portion 22b, and a front end portion 22a1 of the upper plate portion 22a is engaged with a lower end 32c1 of a hole 32c of the driver plate 32. For this reason, the driver plate 32 can move forward, but cannot move backward from the front end of the side plate portion 22b. The second spring 34 is interposed between the inner handle 3 and the staple cover 22 as described above, and an urging force is applied to separate the inner handle 3 and the staple cover 22 from each other. Therefore, the driver unit 30 assembled as described above is stretched between the inner handle 3 and the staple cover 22. The inner handle 3, the staple cover 22, and the driver unit 30 assembled in this way are placed on the leading end portion 32d of the driver plate 32 and the launching portion 21a of the magazine 2 in the staple standby state as shown in FIG. A predetermined gap is provided between the connected staple S and the crown portion.

[Procedures and actions in paper binding]
Since the stapler in the embodiment of the present invention has the above-described structure, the sheet binding operation is performed by the following procedure and action.

  In the standby state, the stapler engages the lower end 32c1 (see FIG. 10) of the long hole below the driver plate 32 of the driver unit 30 and the front end 22a1 of the staple cover 22, so that the front end of the driver plate 32 is engaged. 32d faces the magazine 2 (see FIG. 1).

  In the sheet binding operation, first, a sheet (not shown) is placed on the base table 1 and the sheet contact surface G1 of the alignment member G (with the end of the sheet adjusted to an appropriate position in the scale groove 11d ( As shown in FIG. 1, the outer handle 4 is pushed down by applying a driving force to the operating portion of the outer handle 4.

  When the pressing force of the outer handle 4 is transmitted to the inner handle 3, the inner handle 3 starts to rotate downward with the first support shaft 6 as a rotation fulcrum. At this time, as shown in FIG. 3A, the distance between the inner handle 3 and the magazine 2 is approaching as the aforementioned operating force resists the biasing force of the second spring 34 (see FIG. 2). Accordingly, the driver unit 30 is also lowered toward the staple S accordingly. In addition, since the distance between the inner handle 3 and the magazine 2 is getting closer, the driver unit 30 is engaged with the engagement hole 3b4 of the inner handle 3 from the state where it is stretched between the inner handle 3 and the staple cover 22. The tip portion 31A1 of the arm portion 31A is loosely fitted to the free-moving state and is suspended. In this state, the rear upper end 40 of the both side plates 31b of the driver holder 31 and the upper inner surface 3a2 of the inner handle 3 come into contact with each other, so that the rotational moment is exerted on the driver unit 30 in the direction indicated by the arrow A in FIG. Works. As a result, the driver unit 30 rotates and the front end portion 32d of the driver plate 32 hits the front wall 2b of the magazine 2 in an attempt to advance forward (the right hand side of FIG. 3A).

  When the inner handle 3 is further pushed down from this state, the tip end portion 32d of the driver plate 32 descends while sliding with the front wall 2b of the magazine 2, and as shown in FIG. Abuts against the crown portion of the leading staple S1 positioned at. At this time, the driver unit 30 is in an unstable state in which it is supported at two points, that is, the front end portion 32d of the driver plate 32 and the rear upper ends 40 of the side plates 31b of the driver holder 31. When the inner handle 3 is pushed down, the front end upper inner surface 3a1 of the upper portion of the inner handle 3 and the upper portion 31a1 of the front plate 31a of the driver holder 31 come into contact with each other, and the driver unit 30 is supported at three points together with the previous two points. It becomes a stable state.

  Thus, in conjunction with the turning operation of the inner handle 3, until the tip 32d of the driver plate 32 comes into contact with the crown of the leading staple S1 located at the launching portion 21a of the magazine 2, FIG. As indicated by an arrow B in FIG. 5, the leading end 32d of the driver plate 32 is subjected to a force to move forward, so that the leading end 32d is positioned at the launching portion 21a of the magazine 2 of the connected staple S. It is possible to ensure contact with only one of the staples S1. When the inner handle 3 is further pushed down further, the front end upper inner surface 3a1 and the upper portion 31a1 of the front plate 31a of the driver holder 31 are provided so as to protrude from each other, so that the front end upper inner surface 3a1 and the upper portion 31a1 strongly contact each other. Touch. The inclination of the tapered portion of the upper edge 31b1 of the driver holder 31 is provided so as to follow the shape of the upper inner surface 3a2 of the inner handle 3 at this time, and the rear upper ends 40 of the side plates 31b of the driver holder 31 The inner handle 3 comes into weak contact with the upper inner surface 3a2. As a result, a moment that rotates in the direction of the arrow C shown in FIG. 3C acts on the driver unit 30, and the front surface of the driver plate 32 and the front wall 2 b of the magazine 2 are substantially in the entire overlapping area. The tip of the driver plate 32 slides in the driving direction along the front wall 2 b of the magazine 2. For this reason, the staple S1 is ejected perpendicularly to the magazine 2 (see FIG. 4D).

  The pushing of the outer handle 4 for driving the staple S1 is continued until the lower portion 31b2 of the driver holder 31 comes into contact with the upper surface 2d of the magazine 2, during which the pushing force of the tip end portion 32d of the driver plate 32 pushes the staple S. One staple S1 in the ejecting portion 21a is ejected, and the staple S1 is ejected into the sheet binding portion (see FIG. 5E).

  When the inner handle moves downward, the arm portion 31A of the driver holder 31 is in contact with the engagement hole 3b4 of the inner handle 3 after the leading end 32d of the driver plate 32 comes into contact with the crown portion of the linked staple S7. Since it moves relatively upward, it moves away from the lower edge 3b41 of the engagement hole 3b4 of the inner handle 3, but the upper end 40 of the rear part of the driver holder side plate 31b abuts on the upper inner surface 3a2 of the inner handle 3 by the upward movement. The arm portion 31A does not engage with the upper edge of the engagement hole 3b4. That is, after the tip 32d of the driver plate 32 contacts the crown of the connected staple S7 while the inner handle 3 moves downward, the engagement hole 3b4 is in a state free from the downward movement of the driver unit 30. It has become.

  Further, the rear upper end 40 of the side plates 31b of the driver holder 31 is brought into contact with the upper inner surface 3a2 of the inner handle 3 until the inner handle 3 is pushed down until just before the inner handle 3 is pushed down. For this reason, the driver unit 30 is in contact with the upper inner surface 3a2 of the inner handle 3, the upper inner surface 3a1 of the front end, and the upper surface of the staple S at the three points of the rear upper end 40, the upper portion 31a1 of the front plate 31a, and the tip end portion 32d of the driver plate 32 The posture of the driver plate 32 is stably supported. The rear upper end 40 is separated from the upper inner surface 3a2 immediately before the end of driving of the staple S, and the movement of the next ascending process is prepared.

  Next, the inner handle return operation process after the end of stapling will be described with reference to FIGS. 2, 5A to 5E, and FIG.

  First, after releasing the driving force of the outer handle 4 at the end of the binding of the paper, the magazine 2 and the inner handle 3 rotate the first support shaft 6 by the urging force of the first spring 25 and the second spring 34. As shown in FIG. 5A, the return movement is started by rotating counterclockwise, that is, upward.

  When the inner handle 3 starts to move upward, the upper plate 3a of the inner handle 3 separates from the driver holder 31, so that the driver holder 31 becomes free and receives pressure from the connected staple S from the rear. Since it is strong until the driver plate 32 starts to move, the driver plate 32 is held in contact with the front wall 2b. After that, the arm portion 31A of the driver holder 31 engages with the lower half 3b41 of the lower edge of the engagement hole 3b4 of the inner handle 3, so that the driver holder 31 is lifted in this state as shown in FIG. Moving.

  Further, as the inner handle 3 rotates upward, the engagement hole 3b4 moves rearward, but the driver unit 30 is held in a state where the driver plate 32 is in contact with the front wall 2b. The arm portion 31A of 31 moves relatively forward with respect to the engagement hole 3b4. As the inner handle 3 is subsequently rotated upward, the arm portion 31A moves to the lower edge front half portion 3b42 of the engagement hole 3b4. Since the lower edge front half 3b42 is inclined forward and downward, the contact friction with the arm portion 31A is reduced. For this reason, as the inner handle 3 rotates upward, the arm portion 31A is guided in the direction of the arrow D along the inclination and naturally moves forward (FIG. 5C and FIG. 6). As a result, the driver plate 32 always faces the vertical direction with respect to the magazine 2 while the inner handle 3 rotates upward, and rises to the initial position along the front wall 2b of the magazine 2. (See FIGS. 5D and 5E). Therefore, even if the driver holder 31 is inclined at the end of the spelling, the posture is corrected, so that the contact pressure between the driver plate 32 and the magazine front wall 2b is reduced, and the magazine front wall of the driver plate 32 is reduced. 2b can be easily removed, the magazine 2 can be prevented from being lifted, and a smooth return of the driver plate 32 can be ensured.

  As described above, when the inner handle 3 is pushed down during the spelling operation, the driver holder 32 is moved before the leading end 32d of the driver plate 32 contacts the crown of the leading staple S1 in accordance with the rotation of the inner handle 3. When the rear upper end 40 of the both side plates 31b of 31 and the upper inner surface 3a2 of the inner handle 3 come into contact with each other, the driver unit 30 rotates, and a force to move forward is applied to the front end portion 32d of the driver plate 32. It hits the front wall 2b of the magazine 2. For this reason, the tip end portion 32d can reliably come into contact with the crown portion of the leading staple S1 and be ejected from the launching portion 21a of the magazine 2.

  In addition, since the lower edge front half portion 3b42 of the inner handle 3 that engages with the arm portion 31A of the driver holder 31 is inclined, when the inner handle 3 is rotated upward after the end of the spelling, The arm portion 31 is slidably guided along the lower edge front half 3b42. Therefore, since the driver plate 32 can rise along the front wall 2b of the magazine 2, the contact pressure between the driver plate 32 and the magazine front wall 2b is reduced, sliding friction is reduced, and the magazine front wall of the driver plate 32 is reduced. The removal from 2b can be improved, the magazine 2 can be prevented from being lifted, and the smooth return of the driver plate 32 can be ensured.

  In addition, although the said embodiment is related with the stapler provided with the booster mechanism, this invention is applicable also to a normal stapler.

It is the perspective view which looked at the stapler of this invention from diagonally forward. It is a longitudinal cross-sectional view of the main structure part of the said stapler. (A)-(e) is a figure which shows the operation state at the time of staple driving. (A) (b) is an enlarged view of (a) and (b) of Drawing 3, respectively. (A)-(e) is a figure which shows the operation state at the time of the handle upper return after completion | finish of staple driving | operation. FIG. 6 is an enlarged view of FIG. (A) and (b) are the front views and side views of a driver unit. It is. (A) and (b) are the front views and side views of a driver holder. (A) and (b) are the front views and side views of a driver plate. It is a perspective view which shows the main structure part of this invention.

Explanation of symbols

S Staple 1 Base stand 2 Magazine 22 Staple guide 3 Inner handle 3b4 Engagement hole 3b42 Lower half front half 30 Driver unit 31 Driver holder 31A Arm 32 Driver plate 32d Tip 3a2 Upper inner surface 4 Outer handle 40 Rear upper end

Claims (3)

A magazine in which a driver unit having a driver plate fixed to the front portion of a driver holder is attached to the inside of the front end of the handle having an upper plate and both side plates formed in a U-shape with a downward opening, and staples are stored below the handle. A stapler that coaxially pivots the handle and each rear end of the magazine, and pushes down the handle to drive the leading staple in the magazine with the driver plate and bind the paper,
The arm portions protruding from both side portions of the driver holder are loosely fitted into the engagement holes formed in the both side plates of the handle,
The stapler characterized in that, at the initial stage when the handle is pushed down, the rear upper end of the driver holder is brought into contact with the upper inner surface of the handle to tilt the front end side of the driver plate toward the front side of the magazine.   The lower edge portion of the engagement hole of the handle is inclined so that the arm portion of the driver holder can be guided forward when the handle returns and moves upward after the end of the spelling. The stapler described in 1.   After the front end side of the driver plate abuts on the leading staple, the front upper end of the driver holder abuts on the upper inner surface of the handle, and the driver plate is placed along the front wall of the magazine. The stapler according to claim 1.

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