GB2236974A - Power operated stapling machine - Google Patents

Abstract

A DC power operated stapling machine utilizes a micro-switch (12) to control battery power supply to drive a DC motor 3, which rotatively drives, upon actuation of switch 13 by paper to be stapled, a gear wheel (6) by means of power transmission through a gear set 4 and a screw rod (5). As the wheel 6 rotates pins 18, 19 thereon control a contact rod 15 either for operating a striking block 7 to drive a staple from staple receiving slide 21 to staple paper or for ceasing stapling operation. The pins 18, 19 sequentially press rod 15, against the bias of spring 9, to engage a contact switch 12 to cease stapling operation and to release rod 15 to disengage it from switch 12 to allow spring 9 to drive block 7 to drive the staple. Alternatively, rod 15 is spring biased to engage switch 12 and the pins sequentially displace it from switch 12 to drive block 7 and release it to allow reengagement with switch 12 to cease stapling operation. <IMAGE>

Description

DC POWER OPERATED STAPLING MACHINE SPECTFTCATTO The present invention is to provide a I:ind of DC power operated stapling machine which is characterized by the application of an automatic control circuit to let a DC motor drive a gear set, screw rod and gear wheel to rotate to further complete 2 stapling process through the operation of a spring and a contact rod.

The development and application of advance technology helps to improve the standard and quality of living. In consequence, to develop and design a new product one must consider to satisfy consumers physically zs well as mentally. Currently only those fine and high quality products can effectively attract consumers to buy.

Stapling machine is an important tool commonly used by students, book-keepers, office and file clerks etc., for binding paper documents and pamphlets. In order to satisfy consumers demand and to complete in the market, a manufacturer must continuously create new or improve old products to provide high quality and diversified function.

Currently, stapling machine manufactures are generally trying to develop a compact one for convenient carriage and operation. For binding a pile of papers, a larger stapling machine must be used. However, regular large scale stapling machines for office use are generally operated through manual operation. It is man-power and time consuirjing and will reduce working efficiency.

The main object of the present invention is to provide such a DC power operated stapling machine which utilizes an automatic control circuit and a DC motor to drive a gear wheel to rotate, by means of power transmission through a gear set and a screw rod, to further drive the pins of the gear wheel to press on or release from a contact rod so as to turn onioff G contact switch and to further let a spring drive a striking block to perform stapling process.

Another object of the present invention is to provide such a DC power operated stapling machine in which the pins of the gear wheel are driven to switch on/off the contact switch so as to keep the electric circuit in a closed circuit condition during stapling operation.

A yet further object of the present invention is to provide such a DC power operated stapling machine to minimize power consumption and make stapling easy, in which the electric circuit is comprised of a contact switch and a micro-sitch to form an automatic control circuit so as to automatically trigger the mechanism of the machine to perform one complete cycle of stapling operation immediately after the micro-switch is touched by paper.

Further objects and advantages of the invenZon Will be apparent from a reading of the following detailed description, taken in conjunction with the figures of trite accompanying drawings, in which: Fig. 1 is a perspective structural view of a DC power operated stapling machine embodying the present invention; Fig. 2 is a partly and enlarged perspective structural view of the present invention; Fig. 5 is a first schematic drawing illustrating the operation of the present invention to drive a staple through papers; Fig. 4 is a second schematic drawing illustrating the operation of the present invention to drive a staple through papers; Fig. 5 illustrates another type of DC power operated stapling machine constructed according to the present invention; and Fig. 6 is a circuit diagram of the present invention.

Fig. 1 illustrates an DC power operated stapling machine embodying the present invention, which is generally comprised of a base tl having setting therein internally a battery holder for setting therein cf batteries '2a, 2b) to provide working power, and having mounting thereon externally a DC motor (3) connected to the battery holder by electric wire, a gear set (4) connected to the DC motor, a screw rod (5) engaged with the gear set (4) at one side, a gear wheel (6) engaged with the screw rod (5) at the other side, a striking block (7) set at the front driven by a contact rod (15' to move synchronously, a fixed guide channel (e at the bottom of the striking block . with a spring (9) connected therebetween, said contact rod ('5) is designed in "Y" shape and fixedly supported by an U-shaped channel plate (16), a contact switch (12) below the contact rod (15) and the gear wheel (6), a micro-switch (13) to be triggered by the paper to stable so as to turn on electric circuit to drive the striking block (7) to staple, two pins ( and (19) unitarily raised fro the wheel face of the gear wheel (6) at one side with one opposite to the other to alternatively stop at the contact rod (15) so as to further switch-on/off the contact switch (12), and a feed slide (21). s illustrated in Fig. 2, the feed slide (21) has a hooked end (211) defining therein a retaining notch (212).

The feed slide retainer (22) is set between the slide way (221) and the return spring (223) is mounted on the cross rod (222) such that the feed slide retainer (22) matches with the end (2232) of the return spring (223) to constantly provide an upward push force. When the feed slide (21) slides in the slide way (221), the hooked end (211) of the feed slide (21) will slide over the feed slide retainer ;22! to let the feed slide retainer (22) be engaged with the retaining notch (212).When the U-shaped frame 4224) is forced to press on the feed slide retainer (22), the other end (2231) of the return spring (223) is simultaneously forced to push the hooked end (211) of the feed slide (21) to break away from the constraint of the feed slide retainer (22).

The operation of the present invention is quite simple and outlined hereinafter, with reference made to Figs. 5 and 4. When micro-switch (13; iE triggered by papers fed therein, the DC motor (3) immediately drives the gear set (4) to rotate. By means of power transmission through the gear set (4), the screw rod (5) is driven to rotate and to simultaneously turn the gear wheel (6) to run. When the gear wheel (6) is driven to rotate, the two pins (18) and ilg) are carried to move concomitantly. As soon as the pin (18) is moved to press against the contact rod (15), the striking block (7) is released from constraint and driven by the spring (9) to strike downward so as to drive a staple out of the feed slide (21) for binding. As soon as the contact rod (15) leaves from the contact switch (12), the electric circuit is on (see Fig. 6), and the DC motor (3j keeps operating. Consequently, the pin (19) follows the gear wheel (6) to move to further press on the Y-shaped contact rod (15) so as to drive the rear end of the Y-shaped contact rod (15) to touch the contact switch (12) to switch off the circuit and tc simultaneously stop the operation of the DC motor (3). Thus, staple driving process is finished, and the machine returns to a wait status for next stapling process.

Fig. 5 illustrates an alternate form of the present invention, in which the spring (9), which is connected between the guide channel (8) and the striking block (7) in the foregoing first embodiment, is eliminated.

Alternatively, a spring (9a) is mounted on the rear end of the -- shaped portion of the Y-shaped contact rod (15) to constantly drive the Y-shaped contact rod (15) to lift the striking block (7) to an upper limit position for striking.

Under this condition, the constant revolving direction of the gear wheel (6) must be changed from counter-clocise to clockwise. When the micro-switch (13) is triggered b papers fed therein, the pin (18) or (19) of the gear wheel r6) will lift up the Y-shaped contact rod (15) to drive the striking block (7) to strike downward. As soon as the pin (18) or (19) leaves from the Y-shaped contact rod (15) during rotation of the gear wheel (6), the spring (S, immediately drives the Y-shaped contact rod (15) to move back to touch the contact switch (12) so as to turn off the circuit and to stop the operation of the DC motor (3).

Thus, staple driving process is finished, and the machine returns to a wait status for next stapling process.

Referring to the circuit diagram of the present invention as illustrated in Fig. e. Under normal condition, the micro-switch ( is constantly at a normal closed mod (N.C.) to let capacitor (C) be charged. When the cro- switch (13) is triggered by paper, it will be immediately switched from normal closed position (N.C.) to normal open position (N.O.), and the capacitor (C) will release a negative voltage through current limiting resistor (R) to turn on transistor Q) so as to drive the DC motor (.'l to operate.By means of power transmission through the gear set (4) the screw rod (5) and the gear wheel (6), the pin (18) or (19) will be driven to leave from the contact rod (15). As soon as the contact rod (15) is released from constraint, the contact switch (12) is immediately switched fro normal open position (.0.) to normal closed position (N.C.) to drive the circuit to a closed circuit status. As soon as the pin (18) or (19) presses on the contact rod (15) to touch the contact switch (12) and to let the contact switch (12) be switched from normal closed position (S.C.) back to normal open position (N.O.) to further drive the circuit to an open circuit status. Thus, a cycle of stapling process is completed. As soon as paper is removed from the micro-switch (13), the capacitor (C) is recharged again to become in a waiting status for next start signal so as to perform next stapling operation.

Many changes and modifications in the above described embodiment of the invention can, of course, be carried out without departing from the scope thereof. Accordingly, to promote the progress in science and the useful arts the invention is disclosed and is intended to be limited only by the scope of the appended claims.

Claims (3)

What i Claimed is

1. 6 DC power operated stapling machine, including: a battery holder for setting therein of dry cells or chargeable battery; a DC motor serving as a power transmission source; a gear set to reduce the revolving speed of said notor and to increase the turning moment therefrom; a screw rod engaged with said gear set; a gear wheel being driven to rotate by said screw rod to carry several pins to move simultaneously, said several pins being symmetrically made on the wheel face of said gear wheel and disposed at one lateral side thereof; a stapling mechanism comprised of a Y-shaped contact rod, a striking block mounted on a fixed guide channel and connected with said contact rod, and a spring having both ends respectively connected to said striking block and said guide channel; a micro-switch to trigger stapling operation;; a contact switch to turn on/off electric circuit according to the position of said pins which alternatively force said contact rod to contact or leave fro; the contact switch; and a feed slide for receiving therein staples; wherein said DC motor is driven to operate immediately after triggering of said micro-switch by paper that is fed therein, to drive said gear set to rotate ad to further carry said pins of said gear wheel to leave from said contact rod and to let said striking block be released from the constraint of said contact rod to further let said spring drive said striking bloc to strike a staple out of said feed slide; and the operation of said DC motor is stopped immediately after one of said pins is drIver to force said contact rod to contact said micro-switch again, so as to finalize one cycle of stapling operation.

2. The DC power operated stapling machine as set forth in claim 1, wherein said spring is mounted on the rear end of the - shaped portion of said Y-shaped contact rod, and said gear wheel is designed to rotate clockwise.

3. A DC power operated stapling machine substantially as hereinbefore described with reference to the accompanying drawings.