Abstract:
A stapler apparatus is configured for recovering a binding mechanism reciprocally driven by a drive motor to an idling position region by inertial movement of the binding mechanism after a stop of the drive motor. The stapler apparatus includes an actuating position sensor that detects an actuating position of the binding mechanism before reaching the idling position region to attain a timing to stop the drive motor.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to a stapler apparatus which binds media to be bound (a sheet bundle), such as a plurality of documents printed with a copying machine, a printer, or a composite of machines thereof, etc., with staples. 
     Conventional stapler apparatuses of this type comprise a built-in direct current motor, the drive of the direct current to recover to within an idle position region which is the initial position after the binding process by the binding means, are equipped with a nipping means to hold the binding media, a forming means to form staples into U-shapes, a driving means to drive U-shaped staples into the binding media being nipped and a binding means comprising a bending means to bend the leading ends of staples driven into the binding media and are disposed with an idle position sensor that can detect that the binding means has stopped within the idle position region. Using the output from this idle position sensor, it grasps the position where the binding means has entered within the idle position region and stops the supply of electric power to the direct current motor. At the same time, an electric brake is applied by electrically shorting the input terminal, or by applying a reverse drive to stop the direct current motor, the rotation thereof continues under inertia. Note that the idle position region is set to a regional width wherein the binding means can surely stop in prior consideration of the movement by inertia. 
     However, in recent years, the processing speeds of system apparatuses incorporating stapler apparatuses have become faster and varied, so to handle specifications for those processing speeds, the rotation count of the direct drive motor, which is the drive source for the stapler apparatuses themselves, is increased to increase the binding speeds thereby making it possible to handle the processing speeds of system apparatus to which they are incorporated. 
     However, although it is possible to increase binding speeds by increasing the number of rotations of the direct current motor, inertia also increases, thus it takes a longer amount of time for the direct current motor to stop from beginning the stopping operation until rotation is completely stopped under inertia. Nevertheless, it is structurally impossible to increase the idle position region for the increased stopping time in view of the space of the stapler apparatus itself. The result is that in using such idle position sensors like those of the prior art to grasp the position that the binding means has reached in the idle position region to begin stopping the direct current motor, the binding means will not stop within the idle position region and will over run it because of the inertia before stopping. This causes the problem of a narrowing of the opening of the nipping means that nips the binding media for the amount that was overrun thereby making it impossible to set the binding media. 
     SUMMARY OF THE INVENTION 
     In view of the aforementioned problems, this invention provides a stapler apparatus that can recover the binding means securely to the idle position region for smooth binding, even if the binding speed is increased in accordance to the processing speed of the system apparatus that incorporates the binding speed of the stapler apparatus. 
     In one embodiment, the invention provides a stapler apparatus that recovers a binding means reciprocally driven by a drive motor to within an idle position region by inertia after stopping that drive motor, equipped with an operating position sensor that detects the actuating position of the aforementioned binding means before the idle position region and that can acquire the timing to stop the aforementioned drive motor. 
     According to this invention, as a sensor for acquiring the timing to begin the stopping operation of the drive motor, along with a conventional idle position sensor, an actuating position sensor is disposed to detect the actuating position of the binding means that can start the stopping operation of the drive motor with the timing that will allow the recover of the closing means to within the idling position region, before the idling position region, thereby making it possible to attain the output to stop the drive motor with the timing that was not possible to attain with conventional idling position sensors and that can recover the binding means to within the idling position region accurately despite increases in the binding speed of the stapler apparatus in accordance with the processing speed of the system apparatus and increased inertia. 
     In another embodiment, the invention provides a stapler apparatus that recovers a binding means reciprocally driven by a drive motor to an idling position region under inertial movement after that drive motor is stopped, an idling position sensor that detects that the aforementioned binding means is recovered to within the idling position region and an actuating position sensor that detects the actuating position of the aforementioned binding means before the idling position region are disposed to enable attaining the timing to stop the drive motor based upon the output of the aforementioned idling position sensor and the aforementioned actuating position sensor. 
     According to this invention, along with the conventional idling position sensor, as a sensor to attain the timing to start the stopping operation of the drive motor, an actuating sensor that detects the actuating position of the binding means to start the stopping operation of the drive motor is disposed, in consideration of the inertia according to the drive conditions of the controlled drive motor to correspond to the system apparatus processing speed incorporated therein, and by selectively using the output of the idling position sensor attain the output for stopping to enable recovery of the binding means within the idling position region and the output of the actuating position sensor, it is possible to select in advance when incorporating to a system apparatus and to control based upon the output of a sensor in a position near the recovery of the binding means within the idling position region and to recover the binding means accurately within the idling position region. 
     In yet another embodiment, the invention provides a stapler apparatus that recovers a binding means reciprocally driven by a drive motor to an idling position region under inertial movement after that drive motor is stopped, an idling position sensor to detect that the aforementioned binding means is recovered to within the idling position region and an actuating position sensor to detect the actuating position of the aforementioned binding means before the idling position region and a stopping position sensor to detect that the binding means has stopped within the idling position region the actuating position sensor detecting from the actuating position of the binding means to the idling position region detected by the aforementioned idling position sensor, are disposed. When restarting after stopping partway, other than when the aforementioned stopping position sensor detects the binding means is stopped, the aforementioned drive motor drives in the direction opposite to the normal rotating direction, and based upon the first output of either the aforementioned idling position sensor or the actuating position sensor, or when a stop is detected, the aforementioned drive motor drives in the normal rotation direction. It is possible to attain each of the timing to stop the drive motor based upon the output of the aforementioned idling position sensor. 
     According to the present invention, when restarting after stopping partway, other than when the aforementioned stopping position sensor detects that the binding means is stopped, the aforementioned drive motor drives in a direction opposite the normal direction of rotation, but based on the first output of the outputs of either the aforementioned idling position sensor or the actuating position sensor, or when a stop is detected, the aforementioned drive motor drives in the direction of normal rotation. It is possible to attain the timing to stop the drive motor based upon the output of the aforementioned idling position sensor and if, for example, there is an emergency system apparatus stop, at the restart after stopping partway because of an operation stop caused by a stapling problem on the stapler apparatus, etc, it recovers the binding means accurately to within the idling position region without performing the binding operation again. 
     Below, an embodiment of the stapler apparatus according to the present invention will be described in accordance with the figures. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an external perspective view of a sectional portion comprising the stapler apparatus according to the invention. 
         FIG. 2  is an external perspective view of the disassembled units of the stapler apparatus according to the instant invention. 
         FIG. 3  is a perspective view of the electric drive unit of the stapler apparatus according to the invention. 
         FIG. 4  is a conceptual view to explain the drive transmission system of the electric drive unit of the stapler apparatus according to the invention. 
         FIG. 5  is a perspective view to explain the drive detection sensors of the electric drive unit of the stapler apparatus according to the invention. 
         FIG. 6  is a timing chart of the drive detection sensors of the electric drive unit of the stapler apparatus according to the invention. 
         FIG. 7  is a timing chart of the series of operations of the stapler apparatus according to the invention. 
     
    
    
     DESCRIPTION OF THE REFERENCE NUMERALS 
     
         
           100  Staple cartridge 
           200  Cartridge holder 
           300  Stapler unit 
           320  Electric drive unit 
         CA 30  Drive position detection cam 
         SE Drive detection sensors 
         SE 1  Idling position sensor 
         SE 2  Operating position sensor 
         SE 3  Stop position sensor 
       
    
     DETAILED DESCRIPTION 
       FIG. 1  is an external perspective view showing a section of part of the entire stapler apparatus, mainly comprising the staple cartridge  100 , the cartridge holder  200  and the stapler unit  300 . 
     Firstly, to describe the apparatus according to the sequence of its assembly, the stapler unit  300  comprises the unit frame  310 , the electric drive unit, shown in  FIG. 4 , the staple head unit  330 , the actuating lever  340 , the anvil unit  350 , the clincher unit  360 , the interlock lever  370 , the anvil spring  380 , the paper thickness absorbing spring  390 , the clincher spring  400  and the manual drive plate  500 . 
     The unit frame  310  is sheet metal pressed formed into a sectional U-shape comprising sides established left, right and a bottom. It internally holds the electric drive unit, thereabove the holder guide  301 , which is shown in  FIG. 2  and the staple head unit  330  in the leading edge and properly supports other units on the outside side walls. 
     Note that the electric drive unit, shown in the  FIG. 4 , is composed of a direct current motor MO that is the stapler drive source, the gear train that decelerates the rotation of the motor MO to a determined rotating speed and the transmission cams CA 10  to CA  40  that are decelerated to the determined speed and rotate. Using these drive transmission cams CA 10  to CA  40 , the motor drives the staple head unit  330  and the anvil unit  350  via the actuating lever  340  and the interlock lever  370  and by driving the clincher unit  360 , it controls the series of operations of the stapler. 
     The staple head unit  330  comprises the sheet loading table  331 , the driver  332 , the former  333 , the sheath  334  and the bending block  335 . 
     The pin of the drive position detection cam CA 30  disposed on the final stage of the electric drive unit mates with the driver drive cam CA 40  and the staple head unit  330  moves and displaces upwardly the driver  332 , formed with a leaf spring material. 
     Displacement of the driver  332  abuts the former abutting piece  332   a  on the driver  332  against the former  333 . The driver  332  and former  333  follow a stepped surface, not shown in the figures, formed on the sheath  334  upward to a position where that abutment is released. 
     The former  333  bends into a U-shape staples drawn to the staple bending position of the bending block  335  and holds to guide U-shaped staples on the sides of the former  333  thereof to enable driving. Note that the position where the staple is bent by the former  333  corresponds to the staple driving position below. 
     In this state, the driver  332  released from abutting the former  333  by the protrusion, not shown in the figures, formed at the sheath  334  is displaced further upward leaving the former  333  in that position. 
     By displacing upward, the staple driving unit  332   b  positioned at the leading edge of the driver  332  displaces the bending block  335  to the front from the region of movement of the driver  332  and retracts. 
     The staple driving unit  332   b  of the driver  332  displaced further upward separates from the adhesive staples that have been bent and are adhering to the next staple by adhesive tape. Formed and separated staples are driven by the binding media. 
     Next, the actuating lever  340  has arms extending left and right along the side surfaces of the anvil unit  350 . While nipping in the unit frame  310 , they are supported by the interlocking pivot shaft  331  disposed on the anvil unit  350  sides. 
     In addition, the paper thickness absorbing springs  390  are stretched between the anvil unit  350  in a central location on the left and right arms of the actuating lever  340 . These springs  390  constantly urge in the counterclockwise direction around the interlocking pivot shaft  331  to contact with the stopper  351  formed on the anvil unit  350 . 
     The notch  341  comprising an edge to abut the anvil drive lever  601 , shown in  FIG. 4 , drivingly displaced by the electric drive unit, is formed on the leading edge of the arm positioned on the other edge of the left and right arms. The anvil drive lever swings it clockwise around the interlocking pivot shaft  331  which is pressed and urged downward. 
     The anvil unit  350 , the anvil rocking pivot  352  on one side thereof rockingly supported on the pivot shaft  312  on the unit frame  310 , is constantly rotatingly urged in the clockwise direction by the anvil spring  380  around the pivot shaft  312 . 
     The anvil head  353  on the other side follows the rocking of the actuating lever  340  and rocks counter-clockwise resisting the urging force of the anvil spring  380  to nip and support the binding media at a position that corresponds to the thickness thereof. 
     Note that after the anvil unit  350  nips and supports the binding media by the paper thickness absorbing springs  390 , the actuating lever  340  continues acting alone in resistance to the resilient force of the paper thickness absorbing springs  390  because the anvil unit  350  is locked in that nipping position. 
     To the anvil head  353  that nips the binding media on the anvil unit  350 , the clincher unit  360  that has the left and right paired clinchers  354  for bending the leading edges of staples that have penetrated the binding media driven from below the binding media, is disposed to follow. 
     The clincher unit  360  comprises the clincher lever  361  and is supported by the pivot shaft  312  on the unit frame  310  which is also the pivot for the anvil rocking pivot  352  on the anvil unit  350 . To the leading edge of the clincher unit  360  is mounted the clincher head  362  that bends staples that have been driven and rocks the clincher  354  mounted to the anvil head  353  on the anvil unit  350 . 
     The clincher head  362  is press formed using a steel plate for a spring with a thickness of 1.5 mm while the clincher lever  361  is formed using a plated steel plate of a thickness of 2.0 mm, to absorb the difference in pressing stroke of the clincher  354 . 
     Next, the interlock lever  370  follows the rocking of the anvil unit  350  via the clincher spring  400  to rock the clincher unit  360  and is disposed to continue rotating with the rocking of the clincher drive lever  602 , shown in  FIG. 4 , while the anvil unit  350  nips and stops the binding media and after the anvil unit  350  stops at the nipping position that corresponds to the thickness of the binding media, it continues rotating to bend the staples. 
     The manual drive plate  500  is for resetting stapling defects by manually operating the stapler when a staple is not properly driven by the binding means and the defective staple prevents the stapler apparatus from operating and thus causes a stapling problem, when driving staples. It is mated to the rotating shaft extending to the back side of the output shaft of the direct current motor of the electric drive unit, shown in  FIG. 4 , when manual operations are necessary. 
       FIG. 2  is an exploded perspective view showing the cartridge holder  200  and staple cartridge  100  that are mounted on the stapler unit  300  in  FIG. 1 , pulled out. 
     When pulling from the stapler unit  300 , first the cartridge lock lever  600  which abuts the staple cartridge  100  and urgingly supports in the mounting direction is manually pressed downward to release the abutting, then the staple cartridge  100  is pulled from the cartridge holder  200 . 
     Then, the cartridge holder  200  is pulled from the stapler unit  300 . Conversely, it is also possible to remove the staple cartridge  100  from the cartridge holder  200  after pulling out the cartridge holder  200  while the staple cartridge  100  is mounted to the cartridge holder  200 . 
     Note that the reverse procedures are acceptable when mounting the staple cartridge  100  and cartridge holder  200  to the stapler unit  300 . 
     The staple cartridge  100  is composed of a semi-transparent plastic case and comprises the storage unit  102  that stores the staple band material  101  into which sheets of a plurality of straight staples linked into a band are wrapped into a roll, and the pull-out guide  103  for pulling out the staple band material  101 . 
     The pull-out guide  103  is mounted to the cartridge holder  200  and is equipped with the opening  104  the guide surface on the leading top side being widely cut away to abut the staple feed means  202  on the cartridge holder  200 , the back-feed stopper pawl  105  to arrest so that the staple band material  101  pulled out from the storage unit  102  does not return back into the storage unit  102 , and the leading edge stopper  106  that restricts the leading edge of the staple band material  101  that has been pulled out and that positions the leading edge thereof at the binding position while mounted to the stapler unit  300 . 
     Also, it comprises the feed pawl advancing protrusion  107  that protrudes into the guide surface on the top-side of the leading edge formed on the opening  104  on the pull-out guide  103  and advances the staple feed means  202  when mounting to the cartridge holder  200  to press the leading edge of staples in the staple band material  101  to the edge stopper  106 . 
     Furthermore, to both sides of the staple cartridge  100  are equipped the guide protrusion  108  guided when mounting to the cartridge holder  200  and the stopper pawl  109  that is stopped when mounting to the cartridge holder cartridge holder  200 . 
     Though not shown in the figures, it is possible to bend open the bottom portion the staple cartridge  100  from an appropriate position on the back-feed stopper pawl  105  and the edge stopper  106  to the storage unit  102 . By opening, the back-feed stopper pawl  105  is released from stopping the staple band material  101  thereby making it possible to discard all remaining staples when discarding. 
     The cartridge holder  200  is composed of the holder unit  201 , the staple feed means  202 , the magnet  203 , the guide plate  204  comprising a non-magnetic body, the opening  205 , the guide  206 , the abutting hole  207  and the auxiliary table  208 . 
     The holder unit  201  is formed of a plastic material to cover the front half of the staple cartridge  100 . 
     The staple feed means  202  is rockingly supported on the holder unit  201  and is constantly urged to the staple pull-out direction by a leaf spring, which is not shown in the figures. It is interlocked to the nipping action of the binding means by the anvil unit  350  and charged. It comprises a feed pawl for pressing the staple sheet surface of the staple band material  101  with the recovery action caused by the release of the charge to advance the staple band material  101 . 
     The magnet  203  and the guide plate  204  faces the staple to be driven at the binding position when mounted to the stapler unit  300  and the magnetic attraction of the magnet attracts mis-driven staples to discharge them outside from the stapler unit  300 . 
     The opening  205  is for setting the leading edge of the stopper  106  on the staple cartridge  100  and the leading edge of the staple to protrude and be set at the binding position 
     The guide  206  is for guiding the guide protrusion  108  on the staple cartridge  100  and is composed of a cut-out groove and a bottom surface. 
     The abutting hole  207  abuts the stopper pawl  108  on the staple cartridge  100  and it is one of the supplementary stopping means on the staple cartridge  100  until the staple cartridge  100  is locked by the cartridge lock lever  600 . 
     The supplementary table  208  acts as the loading table where the binding media is loaded along with the table  331  on the staple head unit  330 , as shown in  FIG. 1 , when mounted to the stapler unit  300 . 
       FIG. 3  to  FIG. 5  explain the electric drive unit  320 .  FIG. 3  depicts an external view to explain the entire structure,  FIG. 4  is a conceptual view to explain the drive system and  FIG. 5  is a conceptual view to explain the actuator structure to detect the state of operation. 
     First, in  FIG. 3 , the electric drive unit  320  is composed of the outer cover  321 , the drive system  322  and the operation state detection means SE 1  to  3 . 
     The outer cover  321 , made of a resin formed member having a square shape the front, back and sides substantially completely open, is arranged at the front with the driver  332  and the former  333  the drive system support frame  321   a  with the motor MO protruding to the back side and the holder guide plate  321   b  extending a side of the upper surface thereof to the width of the staple. 
     The operation state detection means SE  1  to  3  are mounted to the side surface means of the drive system support frame  321   a  and penetrating the front, back and side surfaces there is a slit hole formed to guide the drive lever that drives the anvil head  350  and the clincher unit  360 . 
       FIG. 4  shows a conceptual view of the drive system  322 . It comprises the direct current motor MO, the deceleration gear series GA 10  to GA 60 , and the drive detection sensors SE 1  to SE 3  that detect the rotational positions of the drive cams CA 10  to CA 40  and the drive cam CA 30  to control the drive of the direct current motor MO according to the output of the sensors and the manual drive plate  500 . 
       FIG. 5  explains the structure for detection using the drive detection sensors SE, comprising the drive position detection cam CA 30  and the drive detection sensors SE 1  to SE 3 . 
     The drive position detection cam CA 30  comprises three adjacent cam arc surfaces having the same center on that surface with differing diameters. 
     The drive detection sensors SE 1  to SE 3  are composed of a light emitting element, a light receiving element and three paired optical sensors and an actuator that actuates each of these optical sensors. 
     This actuator constantly presses against one side with an L shaped lever by an urging spring, which is not shown in the drawings, on the drive position detection cam CA 30  cam arc surfaces the other side comprising a protruding portion to activate the optical sensors. 
     Of these three drive detection sensors SE 1  to SE 3 , the drive detection sensor SE 1  is the idle position sensor to detect that the stapler apparatus is at the idling position capable for the stapling process or having performed the staple process and has recovered to the initial idling position. 
     The drive detection sensor SE 2  is disposed to enable detecting the binding position before the idling position to acquire the timing to apply the brake to the direct current motor MO just before the idling position so that when the stapling process is completed and the stapler is returning to the idling position at high speed, it will not overrun the idling position under the drive inertia of the direct current motor MO to accurately stop it at the idling position. In this case, it is arranged in a position to detect the state prior to releasing the anvil unit  350  (see  FIG. 1 ) nipping of the stapled media. It is an activation position sensor that is used to apply a brake after a prescribed delay time based on detection signal, via a delay circuit. 
     Because one of either the drive detection sensor SE 1  that is the idling position sensor and the drive detection sensor SE 2  that is the operating position sensor can be used to output a stop in the timing to recover the binding means within the idling position region in consideration of inertia corresponding to the controlled drive motor drive conditions to correspond with the processing speed of the system apparatus by selecting in advance when incorporating them into the system apparatus, it is possible to recover the binding means correctly to within the idling position region. 
     When restarting after a stop partway, other than when the aforementioned stopping position sensor detects a stop of the binding means, the aforementioned drive motor drives in the direction opposite to the normal direction of rotation. Based upon the first output of either the aforementioned idling position sensor or the actuating position sensor, the aforementioned motor drives in the normal direction of rotation. The drive detection sensor SE 3  can attain the timing to stop the drive motor based upon the aforementioned idling position sensor output. If, for example, there is an emergency system apparatus stop, at the restart after stopping partway because of an operation stop caused by a stapling problem on the stapler apparatus, etc, the SE 3  is a stopping position sensor to detect the position to apply a brake to recover the binding means accurately to within the idling position region. 
       FIG. 6  depicts the timing chart of the drive detection sensors SE. It explains the series of detecting operations of each of the drive detection sensors SE in view of the operating states of the binding means composed of the nipping means to nip a binding media, the forming and driving means to drive U-shaped staples into the nipped binding media and the bending means to bend the leading edges of staples driven into the binding media. 
     First, by receiving the binding signal from the system apparatus, the binding operation starts. In state  2 , by separating from the idling position region, the drive position detection cam CA 30 , described in  FIG. 4 , turns the idling position sensor SE 1  OFF. In state  3 , the operating position sensor SE 2  is set to ON. Up to state  4 , by reciprocal movement of the binding means, the binding media is nipped, the staple is formed, the formed staple is driven into the nipped biding media, and the leading edges of the drive staples penetrating the binding media are bent to complete the binding process. 
     Next, the binding means having completed the binding process begins to reciprocally move in the opposite direction with state  4  as a boundary. Corresponding in advance to the high speed specifications of the system apparatus the drive position detection cam CA 30  switches the drive position sensor SE 2  ON to detect that the binding means is positioned before the idling position region. Based on this output, the drive motor MO is stopped while the stop position sensor SE 3  is switched ON to determine the direction of rotation of the drive motor when restarting after a stop partway, which is described below. At state  6 , it is reset to OFF and at the same time that it recovers to within the idling position region, the idling position sensor SE 1  is switched ON. 
     Then, based on the previous output of the operating position sensor SE 2 , it is stopped. The binding means whose movement continues with the drive motor MO continuing drive under inertia recovers to the initial position at state  7  to complete the series of the binding operation. It repeats the next binding operations from state  7  to state  13 . 
     If, for some reason, it stops operation partway, to recover back to the initial position, it detects the output of the stop position sensor SE 3  when restarting after stopping partway. From state  5 , where the stop position sensor SE 3  output switches to ON, if the binding means is in a state other than the range of state  6 , the drive motor MO is rotated in the direction opposite of the normal binding process rotation regardless of the status of the stop and in the return operation, it stops the drive motor MO based upon the output attained first from the output of the idling position sensor SE 1  or the operating position sensor SE 2 . 
     However, if in the range from state  5  to state  6  where the stop position sensor SE 3  is switched to ON, both the driver  332  and the former  333  are passing through the position and returning where the next staple is drawn to staple. If returned back in this state, it returns to the direction to perform a normal binding process without returning back and only stopping because the next staple is going to be stapled. The drive motor MO is stopped based upon the output of the idling position sensor SE 1  and the binding means is recovered to the position of state  7 . 
       FIG. 7  is a timing chart to explain the operation of each of the driver, former, anvil and clincher units&#39; processes. The horizontal axis indicates the angle of rotation of each drive cam and the vertical axis shows the amount of displacement of each levers. The following generally describes the series of operations according to  FIG. 1  and  FIG. 4 . 
     Initially, along with the setting to the stapling position of the binding media a staple execution instruction signal is output to the stapler apparatus from an outside source. 
     This instruction signal starts rotating the direct current motor MO shown in  FIG. 4  and first, the anvil drive cam CA 20  lowers the anvil drive lever  601 . 
     The anvil drive lever  601  penetrates the anvil drive lever swing slit  371 , shown in  FIG. 1  and presses the activating lever  340  slot  341  and resists the anvil spring  380  to push the activating lever  340  downward. 
     Following the displacement of the actuating lever  340 , the anvil unit  350  moves downward to start nipping the binding media. 
     Note that interlocked to the nipping of the anvil unit  350 , the clincher unit  360  interlocked by the interlock lever  370  and the clincher spring  400  follows the anvil unit  350 . 
     In describing the operation of the anvil unit  360 , beginning from the idling position A 0 , rocking stops at a nipped position according to the thickness (the number of sheets) of the binding media set at the binding position, between the position A 1  where, for example, 100 pages of binding media are nipped to the position A 2  where 0 pages are nipped of binding media. 
     After nipping the binding media by the anvil unit  360 , only the actuating lever  340  continues displacement resisting the paper thickness absorbing springs  390 . The anvil unit  360  maintains a displaced state to the position equivalent to the position A 3  by applying an over-stroke to the position A 2  to enable the secure nipping even if there are 0 pages of binding media, in consideration of variations in parts and their assembly, to complete the nipping operation of the binding media using the anvil unit  360 . 
     Before operating to the position A 3  to complete the nipping operation of the binding media using the anvil unit  360 , the driver drive cam CA 40 , shown in  FIG. 4  displaces the driver  332 , shown in  FIG. 1 , upward, and the former  333  following this displacement is pressed upward. 
     The driver  332  begins moving from the position D 1  when the anvil unit  360  is beyond the position A 1 , at position D 2 , the former  333  presses the staple drawing to the driving position and starts forming the staple into a U-shape. In the continuing stroke, by pushing both leading edges of bent staples against the sides of the bending block  335  to guide it, both leading edges of the staple are secured front, back left and right by the former  333 , the bending block  335  and the guide plate  204  on the cartridge holder  200 . 
     Then, the leading edges that touch the formed staple of the driver  332  are pressed into the oblique surfaces of the bending block  335 . The leading edge portion of the driver  332  touches the formed staple at the position D 3  with the bending block  335  retracted from the area of movement of the leading edge of the driver  332 . The leading edge of the formed staple pressed by the driver  332  delayed from the position A 3  where the anvil  350  nips the binding media reaches the position D 4  that touches the surface of the sheet of the binding media to start driving the formed staple into the binding media by the driver  332 . 
     After the driver  332  starts driving the staple, at the same time that the abutting portion that was abutting the former  333  on the driver  332  is released from abutting, by the level protrusion on the sheath  334  at the slightly delayed position D 5 , the former  333  is released from abutting with the driver  332  at the position D 6  just prior to the leading edge of the former  333  touching the surface of the sheets in the binding media and the former  333  stops and the former guides the bend staple driven by the driver  332 . 
     Continuing on, the formed staple is driven by the driver  332 , and after the formed staple crown touches the surface of the sheets in the binding media at the position D 7 , the driver  332  is further driven by the driver drive cam at the position D 8 , but because the driver  332  cannot press the formed staples in, the driver  332  comprising a leaf spring, itself is elastically deformed the amount of the over-stroke to absorb the difference of the mounting position to securely drive the formed staple. 
     The clincher unit  360  is rocked by the clincher drive unit  602  pressed downward by the clincher drive cam CA 10  shown in  FIG. 11  from position C 1  immediately after the position D 8  where the formed staple is driven by the driver  332 , pressing the clincher  354  to complete the clinching operation at the position C 2  by bending the leading edges of the staples that have penetrated the binding media. 
     After the clinching operation is completed, first, the recover operation is started for the driver  332  at the position D 11 . The former  333  part way is re-interlocked and returned to the position D 0  which is equivalent to the initial position passing through the positions of D 12  and D 13 . 
     The anvil unit  350  recovery operation is started slightly delayed to the recovery operation of the driver  332  and is returned to the position A 7  which is equivalent to the initial position passing through the position A 6 . 
     Finally, the anvil unit  360  recovery operation is started slightly delayed to the recovery operation of the driver  350  and is returned to the position C 4  which is equivalent to the initial position to complete the series of the staple operation. 
     According to the above embodiment, it is possible to attain the timing to stop the drive motor and when outputting the drive motor stop signal, to actually consider the inertia acting on the binding means to output a drive motor stop signal at the timing to securely recover the binding means within the idling position region. 
     Also, it is possible to preset the idling position region to idle the binding means to a region of no operation to the drive of the drive motor on the cam rotating plate which is the interlock means to interlock the drive motor and the binding means centering on the reciprocal movement of the binding means. 
     It is also possible to provide an electric stapler apparatus as a stationary product that can use a built in control means for controlling the drive motor drive on the stapler apparatus itself