The present invention relates to an electric stapler, and more particularly, to a safety device having a structure for loading a staple cartridge by vertically reversing a driver mechanism.
An electric stapler driven by a motor, a solenoid, or the like is provided with a safety device for cutting off power at the time of replacing a cartridge due to danger of fault operation of a driver mechanism when replacing a staple cartridge or removing a jammed staple.
A safety device includes a pin, a protrusion, or the like disposed in a top cover of an electric stapler and a microswitch disposed in a chassis. When the top cover is detached at the time of replacing the staple cartridge, the protrusion disposed in the top cover departs from the detection switch; the detection switch is OFF; the power is cut off; and thus the electric stapler does not operate due to erroneous manipulation or vibration. In JP-A-08-183007, there is disclosed an electric stapler that has a door switch and detects that the door switch is closed after replacing a staple cartridge, thereby performing an initialization operation.
The electric stapler and the staple cartridge have various structures, for example, so as to mount the staple cartridge from a lower portion of a driver unit disposed in an upper portion of a clincher into the driver unit, on the basis of mechanism design or a shape of the staple cartridge.
A lower surface of the driver unit is opposed to the clincher. Accordingly, when the staple cartridge is detached in the lower portion of the driver unit as described above, the driver unit as a unit is allowed to rotate about a base portion; the driver unit is reversed so that the lower surface thereof is directed upward; and in this state the staple cartridge is detached from the upper portion of the driver unit.
When the known safety device is applied to the electric stapler with such a configuration, the power is cut off by detaching a switch opening-closing member such as a top cover or closing the switch in a manual; the driver unit is reversed; and then the staple cartridge is replaced. Even after the replacement, the stapler is required to return to the initial state in the opposite order to the above order. Accordingly, it takes a long time.
According to one or more embodiments of the invention, there is provided a safety device of an electric stapler in which trouble in replacing a cartridge is reduced in a driver-reversing electric stapler to improve a manipulation performance.
According to one or more embodiments of the invention, the electric stapler is configured so that a driver unit is disposed on a base frame so as to be vertically reversed and a staple cartridge is loaded or replaced in the driver unit. The electric stapler includes a lock mechanism that locks the drive unit in a regular posture and the vertically reversed posture; and a detection switch that is turned ON and OFF in the regular posture and the other postures in connection with the lock mechanism. The electric stapler is operable in the regular posture of the driver unit and is inoperable in the other postures thereof, on the basis of the state of the detection switch.
According to one or more embodiments of the invention, the lock mechanism includes a movable pin or a movable claw that is disposed in the driver unit; and an engagement portion such as a concave portion that is formed in the base frame. When the driver unit is locked in the regular posture, the movable pin or the movable claw of the lock mechanism engages with the engagement portion of the base frame and pushes the detection switch to turn ON the detection switch.
According to one or more embodiments of the invention, when the driver unit is moved from the regular posture at the time of loading or replacing the staple cartridge, the detection switch is automatically tuned OFF to be in an inoperable state; and when the driver unit is fixed in the regular posture, the electric stapler is released from the inoperable state. For this reason, it is unnecessary to additionally manipulate a safety switch or the like, and the electric stapler is simply handled and has a high stability.
Other aspects and advantages of the invention will be apparent from the following description and the appended claims.
Hereinafter, exemplary embodiments of the invention will be described with reference to the drawings.
When paper is interposed into a front gap between the base frame 2 and the driver unit 3 shown in
The driver unit 3 is loaded with a staple magazine that accommodates staples. When all staples are consumed or clogging occurs due to the staple, the staple magazine can be replaced or the clogging staple can be removed by pulling up a fixation releasing handle 7 disposed on a rear surface of the driver unit 3 to be rotated forward and by vertically reversing the driver unit 3.
The side plate portions 2b are erected on the left and right (in the front-back direction of the sheet in
In
The driver unit 3 shown in
A bell crank lever 14, both upper and lower portions of which are symmetrical each other about a rotation center shaft 14a, is attached to the front portion of the side plate portion 11a of the main frame 11. Both upper and lower portions of the lever 14 are located on rear surfaces of claws portions 12a disposed in both upper and lower portions on the front surface of the slide frame 12, respectively. A tension coil spring 15 is interposed between the rear upper portion of the main frame 11 and the upper portion of the slide frame 12 and the slide frame 12 is urged in the rear direction. Accordingly, the upper and lower claw portions 12a come in contact with the front surfaces of both upper and lower portions of the lever 14 so that the lever 14 is kept in a neutral position.
The fixation releasing handle 7 shown in
As shown in
The slide frame 12 is urged by the tension coil spring 15 disposed between the main frame 11 and the slide frame 12 of the driver unit 3 so that the front guide pin 13a comes in contact with the outer periphery of the cam plate portion 8. Accordingly, when the drive unit 3 is rotated while the fixation releasing handle 7 is further pulled up as shown in
As shown in
When the fixation releasing handle 7 is pulled up in the state of loading the staple cartridge, the slide frame 12 moves so that the front guide pin 13a deviates from the rear concave portion 8b of the cam plate portion 8 of the base frame 2; the driver unit 3 is rotated to return to the initial state in
In this state, the front guide pin 13a pushes the upper portion of the switch lever 10 rearward, the lower portion of the switch lever 10 moves forward to push the detection lever 9a of the detection switch 9, the detection switch is turned ON, a control unit detects the detection switch 9 turned ON or the cutoff of the power circuit is released, and thus the stapler is in an operable state. At this time, in case of a stapler having control means for making a standby state capable of filing paper by transporting and forming staples in a cartridge at the time of replacing the cartridge, the standby operation is executed.
The invention is not limited to the above-described embodiments and may be variously modified within the technical scope of the invention, and it is apparent that the invention includes the modifications.
The application is based on Japanese Patent Application (Japanese Patent Application No. 2005-110773) filed on Apr. 7, 2005, and a content thereof is incorporated herein by reference.
The invention is applicable as a safety device of an electric stapler.
Number | Date | Country | Kind |
---|---|---|---|
2005-110773 | Apr 2005 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP2006/307493 | 4/7/2006 | WO | 00 | 10/2/2007 |