The present invention relates to a stapler in which a staple formed in a U shape is driven from a staple driving section toward sheets of paper to be bound, and in which staple legs penetrating through the sheets of paper to be bound are bent along a rear face of the sheets of paper to be bound by a clincher mechanism disposed opposite to the staple driving section, thereby binding the sheets of paper to be bound.
There is a stapler including: a staple driving section in which a staple striking mechanism having a driver adapted to be driven by a motor is provided, and a cartridge loaded with a plurality of staples is attached; and a table which holds a clincher mechanism disposed so as to face staple legs that are struck from the staple driving section. In the stapler, the staple striking mechanism of the staple driving section is driven toward sheets of paper to be bound placed between the staple driving section and the table, and the staple inside the cartridge is struck toward the sheets of paper to be bound. The staple legs penetrating through the sheets of paper to be bound engage with the clincher mechanism held by the table, and are bent along a rear face of the sheets of paper to be bound, thereby carrying out a stapling.
The table holding the clincher mechanism at a front end thereof is supported at rear ends of side pieces that are integrally formed on both sides of the table in such a way as to be able to rotate with respect to a frame of the staple driving section. In a normal state, the table is rotated such that the clincher mechanism is moved away from an upper surface of the staple driving section. After the sheets of paper to be bound are placed between the clincher mechanism and the staple driving section, the table is rotated so as to hold the sheets of paper to be bound between the table and the upper surface of the staple driving section. Generally, the table needs to support the rear face of the sheets of paper to be bound with a load of about 8 to 10 kg against a binding load caused while the legs of the staple driven by the staple striking mechanism of the staple driving section penetrate through the sheets of paper to be bound and are bent along the rear face of the sheets of paper to be bound by the clincher mechanism formed at the front end of the table. Further, an operating stroke of the table varies in accordance with a thickness of the sheets of paper to be bound. For this reason, the table cannot be rotated directly by a cam, a linkage mechanism or the like. Accordingly, the table is operated with a spring force being applied to the cam or the linkage mechanism. However, a spring that can apply a large load is required in order to support the aforementioned binding load. Therefore, in order to operate the table against the large spring load, the driving mechanism itself is increased in size. As a result, downsizing of a stapler to be incorporated in a copy machine or the like is hampered.
JP-A-2001-191265 discloses a table locking device in which a table is biased by a relatively weak loading spring in a direction in which the table clamps sheets of paper to be bound with a staple driving section, a wedge member is fitted between a part of the table rotate by the spring biasing force and a frame, and the table is fixed by the wedge member in a closed position in which the table clamps the sheets of paper to be bound with the staple driving section. The table locking device includes: a table which is rotatably supported on a body case at a rear end thereof by a rotating support shaft and is biased to rotate in a closing direction by a torsion coil spring; an operating link operable to rotate the table in an opening direction and to hold the table in an open position; and a wedge operable to engage with a part of the table when the table operates in the closing direction, thereby preventing the table from rotating in the opening direction.
In the above described mechanism, during a normal state before a stapler is operated, the operating link is engaged with a rigid shaft which rotates integrally with the table, thereby holding the table in the open position. When the sheets of paper to be bound is placed on an upper surface of the staple driving section and the stapler is operated, the operating link disengages from the rigid shaft interlockingly with a staple striking mechanism which drives staples. As a result, the table is rotated in the closing direction due to the torsion coil spring, and the sheets of paper to be bound placed between the table and the staple driving section is clamped therebetween. As the table rotates in a direction in which it clamps the sheets of paper to be bound, the wedge member is slid by the spring force and engages with the rigid shaft that rotates integrally with the table. As a result, the table is prevented from rotating in the opening direction and is locked in the closed position in which the table clamps the sheets of paper to be bound.
In the table locking device of JP-A-2001-191265, rear ends of both side pieces that are integrally formed on both sides of the table are rotatably supported on the frame, and a pair of wedge members disposed adjacent to the side pieces engages with the rigid shaft that penetrates through the side pieces, whereby the table is locked in the closed position and the sheets of paper to be bound is clamped. Then, after a stapling is completed, in order to remove the bound sheets of paper from between the table and the staple driving section, it is necessary to pull out the pair of right and left wedge members from between the locked table and the frame and to rotate the table in the opening direction. At this time, since the wedge members are firmly fitted between the table and the frame, an initial load when pulling out the wedge members from between the table and the frame becomes very large. As a result, there arises a problem that a drive motor stops, or the drive motor is damaged due to a heat generated by an increase in current flowing through the drive motor.
One or more embodiments of the invention provide a stapler in which a wedge-shaped locking plate locking a table in a closed position so as to clamp sheets of paper to be bound between the table and a staple driving section can be pulled out from between the table and a frame without requiring a large driving force.
According to one or more embodiments of the invention, a table locking device of a stapler includes: a staple driving section which is formed with a staple striking mechanism operable to contain staples and to strike the staples toward sheets of paper to be bound; and a table formed with a clincher mechanism at a front end thereof, the clincher mechanism operable to bend staple legs penetrating through the sheets of paper to be bound by being struck from the staple driving section, the staple legs being bent along a rear face of the sheets of paper to be bound. The table is rotatably supported on a frame via side pieces that are integrally formed on respective sides of the table such that the clincher mechanism formed on the table faces a staple striking position of the staple driving section. A pair of locking plates supported slidably along the frame is inserted between the table and the frame, thereby preventing the table from rotating in a direction in which the clincher mechanism of the table moves away from the staple driving section. Drive cams operable to drive the locking plates are provided independently for each locking plate. Timings, at which the respective locking plates start to operate in a direction in which each of the locking plates are pulled from between the table and the frame by the respective drive cams, are set to be shifted from one another.
According to one or more embodiments of the invention, a stapler includes: a frame; a table which is rotatably supported on the frame; a pair of side pieces which is integrally formed on respective sides of the table in order to rotatably support the table; a first and a second locking plates which are slidable along the frame between a position in which the table is prevented from rotating and a position in which the table is allowed to rotate; and a first and a second drive cams operable to drive the first and the second locking plates respectively.
According to one or more embodiments of the invention, a first timing, at which the first drive cam starts to drive the first locking plate to move from the position in which the table is prevented from rotating to the position in which the table is allowed to rotate, and a second timing, at which the second drive cam starts to drive the second locking plate to move from the position in which the table is prevented from rotating to the position in which the table is allowed to rotate, are shifted.
According to one or more embodiments of the invention, the stapler includes: a staple driving section disposed in a lower portion of the frame; and a clincher mechanism disposed at a front portion of the table. The clincher mechanism faces a staple striking position of the staple mechanism section, and the clincher mechanism moves toward or moves away from an upper surface of the staple mechanism section in accordance with a rotation of the table.
According to one or more embodiments of the invention, when the first and second locking plates are in the position in which the table is prevented from rotating, the clincher mechanism is prevented from moving in a direction away from the staple driving section.
Further, the table is biased in a direction in which the clincher mechanism moves toward the staple mechanism section.
According to one or more embodiments of the invention, the stapler includes: a rotation lever which is rotatably supported on the frame; and a projection which is engageable with the rotation lever, the projection being formed on each of the pair of side pieces. The table rotates in the direction in which the clincher mechanism moves away from the staple mechanism section in accordance with the rotation of the rotation lever.
According to one or more embodiments of the invention, each of the first and second locking plates engages with the corresponding projection in the position in which the table is prevented from rotating.
Further, the first cam face formed on the first drive cam and the second cam face formed on the second drive cam are different in shape.
The other features and advantageous effects are obvious from the description of embodiments and the appended claims.
1 Stapler
2 Frame
3 Staple driving section
5 Table
6 Drive shaft
9 Side piece
11 Clincher mechanism
15 Projection (each side piece of table)
16
a, 16b Locking plates
19
a, 19b Operating levers
24
a, 24b Drive cams
26
a, 26b Cam faces
Hereinafter, an embodiment of the invention will be described in accordance with the drawings.
Embodiment 1
Further, a table 5 is provided in an upper portion of the frame 2, the table 5 being rotatably supported on the frame 2 at a rear end thereof so as to clamp the sheets of paper to be bound placed on an upper surface 4 of the staple driving section 3 between the table 5 and the upper surface 4 of the staple driving section 3. The frame 2 is provided with a drive shaft 6 penetrating through the frame 2, the drive shaft 6 being provided with drive cams, etc. for driving the staple supply mechanism, the staple forming mechanism, the staple striking mechanism and the table 5. The drive shaft 6 is adapted to be rotated by a motor provided inside the frame 2, via a reduction gear 7 disposed on a side surface of the frame 2 and a drive gear 8 fixed to the drive shaft 6.
As shown in
Rotation levers 12 are provided adjacent to both side pieces 9 of the table 5 such that the rotation levers 12 are rotatably supported on the frame 2 by supporting shafts 13. In a initial state, the rotation levers 12 are disposed in a position in which the rotation levers 12 are rotated counterclockwise as seen in
Further, the frame 2 is provided with locking plates 16a, 16b (a first locking plate 16a and a second locking plate 16b) which are slidable along the frame 2 in a state in which the locking plates 16a, 16b are adjacent to the respective side pieces 9 of the table 5. Projections 17 that are integrally formed on the respective locking plates 16a, 16b are movably fitted in each of elongated holes 18 formed on the frame 2. The locking plates 16a, 16b are supported on the frame 2 in such a way as to be slidable along the elongated holes 18. When the rotation levers 12 are rotated clockwise and the table 5 is rotated counterclockwise by a biasing force of the biasing spring, the locking plates 16a, 16b are slid along the elongated holes 18 in a right direction as seen in the figures. Then, the locking plates 16a, 16b move to upper sides of the projections 15 formed on the respective side pieces 9 of the table 5, and engage with the projections 15. Accordingly, the table 5 is prevented from rotating clockwise.
When the legs of the staple penetrating through the sheets of paper to be bound by being struck from the staple driving section 3 abut against the clincher mechanism 11 of the table 5 that is rotated to a closed position, a binding load for bending the staple legs acts on the table 5. For this reason, a force acts on the table 5 in a direction in which the table 5 rotates clockwise. However, the locking plates 16a, 16b move to the upper side of the projections 15 formed on the respective side pieces 9 of the table 5 and prevent the projections 15 from rotating upward, thereby preventing the table 5 from rotating clockwise. In this way, the locking plates 16a, 16b engage with the projections 15 formed on the side pieces 9 of the table 5, and the rotation of the table 5 is locked, whereby the table 5 can be reliably held in the closed position even when a large binding load is applied to the clincher mechanism 11.
Operating levers 19a, 19b are rotatably supported on the frame 2, and are linked to the pair of corresponding locking plates 16a, 16b. Via the operating levers 19a, 19b, the locking plates 16a, 16b are made to slide between a position in which the locking plates 16a, 16b are moved to the upper sides of the projections 15 (a position in which the table is prevented from being rotated) and a position in which the locking plates 16a, 16b are retracted from the upper side of the projections 15 (a position in which the table is allowed to rotate). The operating levers 19a, 19b are rotatably supported with respect to the frame 2 by supporting shafts 20 formed on respective ends of the operating levers 19a, 19b. Operating pins 22 integrally formed on respective rear ends of the locking plates 16a, 16b are movably fitted in recessed grooves 21 formed on the other ends of the operating levers 19a, 16b, whereby the locking plates 16a, 16b and the operating levers 19a, 19b are linked. When the operating levers 19a, 19b rotate about the supporting shafts 20 clockwise, the locking plates 16a, 16b operate so as to move to the upper side of the projections 15. When the operating levers 19a, 19b rotate about the supporting shafts 20 counterclockwise, the locking plates 16a, 16b move to a retracted position in which the locking plates 16a, 16b are retracted from the upper sides of the projections 15.
Springs 23 are provided at respective lower ends of the operating levers 19a, 19b so as to bias the operating levers 19a, 19b to rotate. The springs 23 bias the operating levers 19a, 19b to rotate clockwise. In this way, the locking plates 16a, 16b are constantly biased so as to move to the upper sides of the projections 15. Further, for each of the operating levers 19a, 19b, drive cams 24a, 24b (a first drive cam 24a and a second drive cam 24b) are provided so as to face the corresponding operating levers 19a, 19b and to rotate the operating levers 19a, 19b. When the operating levers 19a, 19b rotate counterclockwise via the drive cams 24a, 24b that are attached to the drive shaft 6, the locking plates 16a, 16b move to the position in which the locking plates 16a, 16b are retracted from the upper sides of the projections 15. The operating levers 19a, 19b are formed with drive pins 25, each engaging with respective cam faces 26a, 26b formed on the drive cams 24a, 24b. The operating levers 19a, 19b rotate counterclockwise by rotating the drive cams 24a, 24b with the drive shaft 6. In this way, the locking plates 16a, 16b move to the retracted position to which the locking plates 16a, 16b are retracted from the upper sides of the projections 15.
As shown in
In this way, the respective cam faces 26a, 26b of the drive cams 24a, 24b are formed such that respective timings the operating levers 19a, 19b start to operate are shifted, whereby respective timings of pulling out the pair of right and left locking plates 16a, 16b from between the table 5 and the frame 2 are shifted. Therefore, a load to the drive shaft 6 that rotates the drive cams 24a, 24b to operate the right and left locking plates 16a, 16b in a pulling direction is divided in two times. As a result, a maximum load to the drive shaft is reduced.
Operations according to the embodiment will be described below with reference to FIGS. 4 to 8. In an initial state, as shown in
When the sheets of paper to be bound is placed between the upper surface 4 of the staple driving section 3 and the clincher mechanism 11 at the front end of the table 5 and when the stapler 1 is driven so as to staple the sheets of paper to be bound, as shown in
When the stapling operation of the stapler 1 further proceeds, as shown in
When the locking plates 16a, 16b that are slidable along the elongated holes 18 formed in the frame 2 are thus disposed above the projections 15 formed on the respective side pieces 9 of the table 5, the locking plates 16a, 16b act such that a wedge action between the elongated holes 18 and the projections 15, prevents the table 5 from rotating clockwise about the supporting shafts 10 with respect to the frame 2. Consequently, in this condition, the stapling load, which acts on the table 5 when the legs of the staple struck from the staple driving section 3 toward the sheets of paper to be bound are bent along the rear face of the sheets of paper to be bound, can be held by the locking plates 16a, 16b.
After the stapling is carried out by bending the legs of the staple struck from the staple driving section 3 along the rear face of the sheets of paper to be bound, as shown in
At this point of time, the drive pin 25 of the other operating lever 19b is held in a position in which operating lever 19b is rotated clockwise by the cam face 26b of the other drive cam 24b that faces the operating lever 19b, so that the other locking plate 16b is engaged with the projection 15 formed on the other side piece 9 of the table 5. Consequently, the table 5 remains locked in a state in which the table 5 is rotated counterclockwise and the sheets of paper to be bound is held between the table 5 and the staple driving section 3.
When the drive cams 24a, 24b are further rotated by the drive shaft 6, as shown in
Subsequently, the rotation levers 12 are rotated about the supporting shafts 13 by not-shown drive cams so as to engage with the projections 15 formed on the respective side pieces 9 of the table 5, and cause the table 5 to rotate clockwise about the supporting shafts 10 via the projections 15, thereby holding the table 5 in the position in which the clincher mechanism 11 formed at the front end of the table 5 is rotated away from the upper surface 4 of the staple driving section 3 as shown in
While the invention has been described in detail with reference to the specific embodiment, it is obvious to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention.
The present application is based on Japanese patent application (Patent Application No. 2004-284777) filed on Sep. 29, 2004, the content of which is incorporated herein by reference.
According to one or more embodiments of the invention, in a stapler, a table is rotatably supported on a frame via side pieces that are integrally formed on respective sides of the table such that a clincher mechanism faces a staple striking position of the staple driving section. The table is prevented from rotating in the direction in which the clincher mechanism of the table moves away from the staple driving section by inserting a pair of locking plates supported slidably along the frame between the table and the frame. Drive cams operable to drive the locking plates are provided independently for each of the locking plates. Timings, at which the respective drive cams start to operate the corresponding locking plates in a direction in which respective locking plates are pulled out from between the table and the frame, are set to be shifted from one another. For this reason, the right and left locking plates are pulled out from between the table and the frame at different timings. As a result, it is possible to reduce maximum rotation loads to the drive cams that drive the locking plates in the pulling out direction, and to a drive shaft that rotates the drive cams. Thus, a driving current of the electric motor can be reduced, thereby enabling a reduction in noise generated by the electric motor, a reduction in noise resulting from an increase and decrease in the number of revolutions of the electric motor, and a reduction in the size and cost of the electric motor.
Number | Date | Country | Kind |
---|---|---|---|
2004-284777 | Sep 2004 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/JP05/17359 | 9/21/2005 | WO | 2/27/2007 |