WO2008116350A1

WO2008116350A1 - A safety paper-shredder and its paper-inlet tactile sensing device

Info

Publication number: WO2008116350A1
Application number: PCT/CN2007/001375
Authority: WO
Inventors: Fenqiang Zhong
Original assignee: Fenqiang Zhong
Priority date: 2007-03-27
Filing date: 2007-04-25
Publication date: 2008-10-02
Also published as: CN101032706A

Abstract

This invention discloses a tactile sensing device for a paper-shredder inlet, including: two conductive components, which are arranged in the paper-shredder inlet with a clearance between them and can generate a tactile signal, and an on-off circuit, which is electrically connected to the two conductive components respectively and can receive the tactile signal to command a controlling circuit in halt operation of shredder, thereby preventing human body from being injured. This invention also discloses a safety shredder having the tactile sensing device.

Description

Safety shredded paper fel its paper inlet touch sensing device

Technical field

The present invention relates to a safety shredder, and a paper feed touch sensing device for such a safety shredder. Background technique

In China, shredders are currently only popular in the office, but in foreign countries, shredders have been widely used in various households. Therefore, it can be inferred that domestic household shredders will be very common in the future.

Traditional shredders are used in the home, and there have been many accidents, mainly hurting children's fingers. Taking into account the lack of safety awareness among family children, household shredders need to enhance their safety performance so that children do not accidentally insert their fingers into the paper feed port of the shredder, resulting in accidents. Even in office applications, it is a peculiar thing to accidentally enter the shredder's paper feed port, causing an accident.

Therefore, the safety function of the shredder is becoming more and more important in the industry.

Patent application No. 6, 2006, CN200610060917. Patent application No. 6 discloses a shredder paper feeding safety structure, which is provided with a protective pressing plate at the edge of the paper feeding edge of the shredder, and the bottom surface of the protective pressing plate is supported by the elastic material. And in contact with the pressure handle of the micro switch that controls the power supply of the shredder. Preferably, the bottom surface is supported by at least two compression springs and is in zero pressure contact with the shank of the microswitch that controls the power supply of the shredder.

In practical applications, since the elastic material, especially the compression spring, is liable to lose elasticity due to mechanical fatigue, and the micro-motion shape is also susceptible to loss of sensitivity, the applicant believes that this technical solution is difficult to bring about a good safety effect.

Then, on January 3, 2007, the patent application discloses a safety shredder comprising a housing and a motor that sets the shredder blade set and the drive blade set therein to

1

Confirmation And a control circuit for controlling the motor to stop, wherein the casing has a paper feed opening on the upper surface thereof, and the surface of the casing at least at the edge of the paper feed port is made of a conductive material, and further includes a conductive member, and the casing One end is electrically connected to the surface of the conductive material on the casing, and the second end is connected to the control circuit. The technical solution can automatically monitor and control the motor to stop by a sensing circuit for the clutter sensing signal generated by the human or animal touching the paper feeding port of the shredder, without mechanically controlling the operation, so Quickly and accurately protect the safety of the operator. In addition, the inductive control circuit provided also has an automatic recovery function, and the shredder can automatically resume normal operation when the abnormal working state is eliminated or transferred.

CN200610052681. The technical solution of the patent application No. 1 substantially utilizes the principle that the human body is a signal source. When the human body touches the conductive material of the machine, the signal is amplified by the circuit to control the paper machine to stop rotating, thereby achieving the purpose of safety protection. However, the applicant has long been engaged in the research and development of shredders. It is well known that this technical solution has a relatively high sensitivity compared to CN200610060917. No. 6, and although it can achieve safety control to a certain extent, it has working performance. The shortcomings of instability, its performance is more susceptible to environmental factors, such as temperature, humidity, routing, movement size and whether there is a ground wire, etc., are easy to affect the sensitivity of human touch sensing, and its design difficulty is also greater . Therefore, the shredder paper feed safety protection scheme that relies entirely on the human body as a touch-sensing signal source is difficult to achieve high safety performance requirements. Summary of the invention

In view of the above-mentioned deficiencies of the current paper feeder inlet protection, the first object of the present invention is to provide a paper feed port touch sensing device, so that the ability of the paper shredder to sense the human body touch is greatly improved, and further The shredder makes the safety status identification and controls the running state of the shredder mechanism in time to improve the safety performance of the shredder.

In order to solve the technical problem of the present invention, the present invention is achieved by the following technical solutions:

The paper inlet touch sensing device of the invention comprises two conductive members and a switch circuit, and two conductive members Installed on the paper feed port of the shredder with a certain gap adjacent to each other, and electrically connected to the switch circuit respectively, the switch circuit provides a control signal to the control circuit of the shredder for switching the operation state of the shredder .

In order to enhance the safety performance of the circuit, a finite current resistor is provided in a branch formed in series between each of the conductive members and the switching circuit.

More specifically, the switch circuit includes a triode, the base and the collector respectively form a branch with a set of current limiting resistors and a conductive member, the emitter is grounded, the collector is externally connected to the power source, and the control signal is set The electrode is taken out. In addition, the switch circuit further includes a capacitor electrically connected between the base and the emitter of the transistor.

In order to adapt to the width of the human finger, the maximum gap between the two conductive members is preferably less than 1.5 cm.

According to the first embodiment of the present invention, the two conductive members may be metal sheets or conductive plastic sheets respectively disposed on the longitudinally long side walls of the paper feed opening of the shredder.

According to the second embodiment of the present invention, the two conductive members may be metal metal wires, and the spiral windings are arranged on at least one of the longitudinal side walls of the paper feed opening.

In addition, according to the third embodiment of the present invention, the two conductive members are a plurality of parallel and serial metal line lines, and the metal lines of the two conductive members are arranged in parallel with each other in parallel, and are integrally disposed on the paper feeding. At least one longitudinal side wall of the mouth.

Further, a second object of the present invention is to provide a safety paper shredder by applying the paper feed port touch sensing device of the first object.

The safety shredder includes a shredder mechanism, a casing and a control circuit, and the casing is provided with a paper feed port, and the shredder mechanism is installed in the casing and corresponding to the paper feed port to facilitate shredding, the control circuit and the control circuit The shredder mechanism is electrically connected to implement management of the shredder. In addition, the safety shredder further includes the touch sensing device of the first object.

In particular, according to the first embodiment of the present invention, in order to rationally design the shredder, the two The conductive member has an elongated plate shape, and cooperates with the two side walls of the paper feed port and is respectively attached thereto. In order to facilitate the electrical connection between the conductive member and the switch circuit, the bottom surface of the two conductive members is provided with a metal conductive electrode, and the housing is provided with a corresponding through hole corresponding to the conductive electrode, and the conductive electrode penetrates the through hole and the triode Electrical connection.

Compared with the prior art, the present invention has the following advantages:

By adding the paper inlet touch sensing device on the basis of the conventional shredder, the two conductive bodies cooperate to sense the conductive object such as the human body and even the insect to contact the paper feeding port with higher sensitivity, and then Switching the running state of the shredder in time can improve the safety performance of the shredder, so as to avoid accidents such as accidental finger injury, which is conducive to the spread of shredders to household users and further develop its market potential.

DRAWINGS

1· 1 is a circuit schematic diagram of a paper feed port touch sensing device according to a first embodiment of the present invention; FIG. 2 is a schematic view showing an assembly structure of a cover body portion of a casing according to a first embodiment of the present invention; Partial view from the middle;

4 is a schematic structural view of two electric conductors according to a second embodiment of the present invention;

Fig. 5 is a schematic view showing the structure of two electric conductors according to a third embodiment of the present invention.

Implementation

The basic structure of the shredder generally consists of a housing, a shredder mechanism and a corresponding control circuit. The housing is generally composed of a cavity and a cover 2 (see FIG. 2, the same below), and the shredder mechanism is mounted on the upper portion of the cavity. The lower part of the cavity is provided with a container such as a trash can to accommodate the paper scraps formed by the shredded paper shredded paper. The shredder mechanism includes one or three knife rolls arranged side by side and a corresponding transmission mechanism. The transmission mechanism is composed of a motor combined with a gear set, one end of the gear set is connected with the knife roll, and the other end is connected with the motor, and the control circuit It is electrically connected to the drive motor of the shredder mechanism, and the motor is thus controlled by the control circuit. Therefore, the user operates the control circuit to drive the motor of the transmission mechanism to rotate, and the motor is linked by the gear set, so that the knife roller of the paper shredder mechanism can realize rolling and shredding the paper to achieve the purpose of shredding. The upper part of the cavity is protected by the cover body 2. For the necessity of shredding paper, the corresponding feeding port 20 of the cover body 2 corresponding to the two knife rolls of the paper shredder mechanism should be provided (refer to Figs. 2 and 3); Similarly, for ease of operation, a control panel for providing control buttons in the control circuit is also generally disposed on the cover 2, and the user can send an instruction to the control circuit by operating a control button on the control panel, and then After the instruction is interpreted by the control circuit, various operations are performed, and the operation process and the result are displayed on the display device of the control circuit, thereby realizing human-computer interaction. Since the description of the control circuit involving the shredder mechanism is mostly found in the prior art, it will not be described here.

Fig. 1 shows a schematic circuit diagram of a touch sensing device of the present invention, comprising two conductive members 11, 12, a plurality of current limiting resistors R1, R2, R3, R4 and a switching circuit. The switching circuit is composed of a transistor Q1 and a capacitor C1. The first conductive member 11 is electrically connected to the first group of current limiting resistors R1 and R2, and then connected to the collector of the transistor Q1 (the access point is VCC); After the second conductive member 12 and the second set of current limiting resistors R3 and R4 are sequentially electrically connected, the base of the transistor Q1 is connected, and the emitter of the transistor Q1 is grounded, and the current limiting resistor R2 and the collector of the transistor Q1 are connected. A resistor R5 is further provided, and a power supply VCC is connected between the current limiting resistor R2 and the resistor R5, and a connection line OUT between the resistor R5 and the collector of the transistor Q1 is electrically connected to a control circuit (not shown) of the shredder.

The current limiting resistors R1 to R4 can prevent accidents caused by the human body touching the conductive members 11 and 12 when the current is too high, and can prevent the line fault caused by the short circuit of the VCC to the ground. In a specific application, a proper gap is maintained between the first conductive member 11 and the second conductive member 12, and the first conductive member 11 and the second conductive member 12 are easily touched by the human finger in time, for example, 1.5 cm. Since the human body itself is a conductor, when the human body contacts the two conductive members 11 and 12 at the same time, the current limiting resistors R1 and R3 are connected through a resistor, so that the current of the VCC terminal sequentially passes through the current limiting resistors R2, R1, and R3. R4 flows into the emitter of transistor Q1, causing Q1 to conduct and a low level at the OUT point; when the human body leaves the two conductive members 11, ^ page At 12 o'clock, an open circuit occurs between the current limiting resistors R1 and R3, the transistor Q1 is turned off, and the OUT point outputs a high level.

Therefore, it can be determined whether the human body touches two conductors by detecting the high and low state of the OUT point, and the control circuit resumes the normal operation of the shredder mechanism at a high level according to the level state of the OUT point, and stops at a low level. When the paper mechanism is running, the function of safety control can be realized. Since the human body is a signal source and has a 50 Hz sensing signal, the capacitor Cl is added to the switching circuit in order to eliminate the interference between these sensing signals and other environments.

The shape of the two conductive members 11, 12' can be freely designed. The key is to keep the two conductive members 11, 12 with a certain gap for judging whether the human hand touches. Therefore, it is necessary to rationally position the two conductive members 11, 12 It is installed on the paper feed port 20 of the shredder.

Figures 2 and 3 together disclose a typical conductive member 11, 12 and its assembled structure. On the cover 2 of the shredder, the paper feed opening 20 is elongated and has two opposite longitudinal side walls 23, 24, and the two side walls 23, 24 are waist-shaped in cross section. Correspondingly, the two conductive members 11 and 12 are made of plated metal sheets or conductive plastic sheets, and have a longitudinally long plate shape as a whole, and are also waist-shaped in cross section to be longitudinally long with the paper feed port 20 . The two side walls 23, 24 are matched, and the two conductive members 11, 12 are respectively attached to the two side walls 23, 24, thereby maintaining the paper feed port 20 as a whole.

Referring to FIG. 1 to FIG. 3, the connection between the first conductive member 11 and the current limiting resistor R1 and the connection between the second conductive member 12 and the current limiting resistor R3, the two side walls 23 of the paper feeding port 20 On the 24, the through holes 230, 240 for the traces are required. In order to make the design effect better, the metal conductive electrodes 110, 120 are respectively added on the bottom surfaces of the two conductive members 11, 12, and the internal electrodes are provided on the conductive electrodes 110, 120, and the conductive electrodes 110, 120 penetrate the two side walls. After the through holes 230, 240 of 23, 24, the two conductive members 11, 12 and the paper feed port 20 can be made by screwing the holes 112, 122 and the screws 111, 121 on the bottom of the cover 2 to the internal threaded holes. The two side walls 23, 24 are secured and can be wired through the washers 112, 122 such that the two conductive members 11, 12 are ultimately electrically connected to the ends of the transistor Q1 in the switching circuit.

'The two conductive members 11, 12 and the two side walls 23, 24 of the paper feed port 20 are firmly connected in two steps. The connection between the internal threaded holes of the conductive electrodes 110, 120 and the screws 111, 121 can also be realized by an equivalent manner, such as a plurality of well-known connection methods, such as a snap-on or a screw lock. The sub-master is engaged, the tapping screw is tapped, and so on.

In the above embodiment, the two conductive members 11, 12 are required to cooperate with the two longitudinal side walls 23, 24 of the paper feed port 20, so that the paper feed thickness of the paper feed port 20 and the conduction of the two conductive members 11 are A contact between 12, the width of the contact will form a difficult contradiction. Therefore, further, the previous embodiment can be modified to design the two conductive members 11 and 12 as metal strips as shown in FIG. 4, and spirally wrap them around the paper feed port 20 Or two longitudinal side walls 23, 24. Thus, since the distance between the metal lines can be freely designed, the sensitivity for detecting the touch of the human body can be greatly improved, and the cost can be reduced as compared with the previous embodiment, and the overall effect can be better.

In addition to the above-described modifications, the two conductive members 11, 12 may also be considered as an embodiment as shown in FIG. 5, which is designed as a plurality of metal lines parallel to each other and connected in series, in the shape of an E word, and then The metal lines of the two conductive members are arranged in parallel with each other in parallel, and are integrally disposed on the paper feed port 20 or the two longitudinal side walls 23, 24. The effects of this embodiment are substantially the same as those of the last modified embodiment, and therefore will not be described again.

In summary, the present invention provides a safer performance for the conventional shredder, and can detect the foreign matter of the paper feed port with high sensitivity, and is particularly useful for detecting the intrusion of human hands, and is advantageous for safe use of shredded paper. Machine, which facilitates the further development of shredders for household use.

The present invention has been shown and described with respect to the preferred embodiments of the present invention, which are not to be construed as limiting the scope of the invention. Under the premise, it can be changed in form and detail. The appended claims cover all such changes and modifications within the spirit and scope of the invention.

Claims

Claim

A paper inlet touch sensing device, comprising: two conductive members and a switch circuit, wherein the two conductive members are mounted adjacent to the paper feed port of the shredder with a certain gap, and respectively connected to the switch The circuit is electrically connected, and the switch circuit provides a control signal to the control circuit of the shredder for switching the operating state of the shredder.

2. The paper feed port touch sensing device according to claim 1, wherein a finite current resistor is disposed in a branch formed by connecting each of the conductive members and the switch circuit.

3. The paper feed port touch sensing device according to claim 2, wherein: the switch circuit comprises a triode, and the base and the collector respectively form a branch with a set of current limiting resistors and a conductive member, respectively. The emitter is grounded, the collector is externally connected to the power source, and the control signal is drawn from its collector.

4. The paper feed port touch sensing device according to claim 3, wherein: the switch power further comprises a capacitor electrically connected between the base and the emitter of the triode.

5. The paper feed port touch sensing device according to claim 4, wherein: a maximum gap between the two conductive members is less than 1.5 cm.

The paper feed port touch sensing device according to any one of claims 1 to 5, wherein: the two conductive members are metal sheets or conductive plastic sheets, respectively disposed on the longitudinal direction of the paper feed port of the shredder Long two side walls.

The paper feed port touch sensing device according to any one of claims 1 to 5, wherein: the two conductive members are metal wire lines, and the spiral winding is arranged at least one longitudinal direction of the paper feed port. On the long side wall.

The paper feed port touch sensing device according to any one of claims 1 to 5, wherein: the two conductive members are a plurality of metal strands in parallel and in series, and the metal strips of the two conductive members. The wires are arranged in parallel with each other in parallel, and are integrally disposed on at least one of the longitudinal side walls of the paper feed port. .

9. A safety shredder comprising a shredder mechanism, a housing and a control circuit, the housing being provided with a paper feed opening, the shredder mechanism being mounted in the housing and corresponding to the paper feed opening for shredding paper, The control circuit is electrically connected to the shredder mechanism for realizing management of the shredder. The safety shredder further includes a touch sensing device, which comprises two conductive members and a switch circuit, and two conductive devices. And a switch is electrically connected to the switch circuit, and the switch circuit is electrically connected to the control circuit to provide a control signal to the device. The switch circuit is electrically connected to the switch circuit. The control circuit is for switching the operating state of the shredder.

A safety paper shredder according to claim 9, wherein a finite current resistance is provided in a branch formed between each of the conductive members and the switching circuit.

The safety paper shredder according to claim 10, wherein: the switch circuit comprises a triode, wherein the base and the collector are respectively connected in series with a set of current limiting resistors and a conductive member to form a branch, and the emitter is emitted. The pole is grounded, the collector is externally connected to the power source, and the control signal is taken out from its collector.

12. The safety shredder according to claim 11, wherein the switch circuit further comprises a capacitor electrically connected between the base and the emitter of the triode.

13. A safety shredder according to claim 12, wherein: the maximum gap between the two conductive members is less than 1.5 cm.

The safety shredder according to any one of claims 9 to 13, wherein: the two conductive members are metal sheets or conductive plastic sheets, which are respectively disposed on the longitudinal length of the paper feed port of the shredder. Side wall.

The safety paper shredder according to claim 14, wherein the two conductive members are in the form of an elongated plate, and are fitted to the two side walls of the paper feed opening and respectively attached thereto.

The safety shredder according to any one of the preceding claims, wherein: the bottom surface of the two conductive members is provided with a metal conductive electrode for wiring, and the housing is provided with a corresponding through hole corresponding to the conductive electrode. The conductive electrode is electrically connected to the transistor through the through hole.

The safety paper shredder according to any one of claims 9 to 13, wherein: the two conductive members are metal wire lines, and are spirally wound around at least one longitudinal side of the paper feed port. On the wall.

The safety shredder according to any one of claims 9 to 13, wherein: the two conductive members are a plurality of parallel and serial bare metal wires, and the metal wires of the two conductive members are mutually The cross-parallel arrangement is integrally disposed on at least one longitudinal side wall of the paper feed port.