WO1999030837A1 - Pistolet a colle a arret automatique - Google Patents

Pistolet a colle a arret automatique Download PDF

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Publication number
WO1999030837A1
WO1999030837A1 PCT/US1998/026742 US9826742W WO9930837A1 WO 1999030837 A1 WO1999030837 A1 WO 1999030837A1 US 9826742 W US9826742 W US 9826742W WO 9930837 A1 WO9930837 A1 WO 9930837A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
heating element
operable
circuit
operational amplifier
Prior art date
Application number
PCT/US1998/026742
Other languages
English (en)
Inventor
Michael A. Singleton
Original Assignee
Stanley Fastening Systems, L.P.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stanley Fastening Systems, L.P. filed Critical Stanley Fastening Systems, L.P.
Priority to AU17277/99A priority Critical patent/AU737279B2/en
Priority to DE69814914T priority patent/DE69814914T2/de
Priority to EP98962120A priority patent/EP1037715B1/fr
Priority to JP2000538805A priority patent/JP2002508246A/ja
Priority to AT98962120T priority patent/ATE240790T1/de
Priority to CA002314082A priority patent/CA2314082A1/fr
Publication of WO1999030837A1 publication Critical patent/WO1999030837A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
    • H01H47/18—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for introducing delay in the operation of the relay
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00523—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material
    • B05C17/00526—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material the material being supplied to the apparatus in a solid state, e.g. rod, and melted before application
    • B05C17/0053—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material the material being supplied to the apparatus in a solid state, e.g. rod, and melted before application the driving means for the material being manual, mechanical or electrical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00523—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes provided with means to heat the material
    • B05C17/00546—Details of the heating means

Definitions

  • the present invention relates generally to an auto shut-off glue gun and, more particularly, to a glue gun having a timing control circuit that upon release of the glue gun trigger, turns off the heating element after a predetermined amount of time.
  • the present invention also relates to a timing circuit that controls an operative element.
  • Glue guns are well-known for dispensing molten thermoplastic materials. Generally, such devices comprise a barrel member having an internal melting chamber which communicates with an outlet opening through a nozzle. The internal melting chamber is made of a thermally conductive material, such as aluminum, and is configured to receive a solidified supply of adhesive therein. An electrical heating element is used for heating the melting chamber. The heating element generates heat via the conversion of electrical energy flowing through the heating element.
  • Glue guns also generally include a handle adapted to be gripped with one hand while the user presses the block through the sleeve and into the melting chamber to force molten thermoplastic material out of the melting chamber through the nozzle.
  • many glue guns also include a pusher member for pushing the supply forward as a result of depressing the actuator
  • glue guns are plugged into an electric signal service such as an AC wall outlet.
  • shutting off the heating element consists of removing the AC plug from the wall outlet.
  • This type of glue gun may present a fire hazard because the heating element continuously generates heat when the gun is accidentally left plugged-in.
  • These glue guns typically use a positive temperature coefficient (PTC) heating element which is regulated so as not to exceed a predetermined temperature.
  • PTC heating elements typically only have an operating life of approximately 1000 hours. Thus, leaving the gun plugged in not only presents a safety hazard, but it also has detrimental effect of the life of the heating element.
  • the present invention provides a glue gun comprising a housing having a manually engageable handle portion, a manually operable actuator or trigger movable between an actuated position and a non- actuated position, and a nozzle configured to allow molten hot-melt adhesive to flow therethrough.
  • the housing has interior surfaces defining an adhesive receiving chamber fluidly communicated with the nozzle and the chamber has an opening at one end thereof for allowing a supply of solidified hot-melt adhesive to be inserted into the chamber.
  • a heating element is associated with the chamber and is positioned so as to be disposed adjacent to a lead end portion of the solidified adhesive supply when the adhesive supply is inserted into the chamber.
  • the heating element is operable to apply heat to the lead end portion of the solidified adhesive supply sufficient to melt the lead end portion when an electric signal is supplied to the heating element.
  • the chamber is constructed and arranged such that pressure can be applied to the solidified adhesive supply so as to force the molten adhesive from the lead end portion thereof outwardly through the nozzle.
  • a heating element controller has a signal source input adapted to be connected to an electric signal source in power supplying relation. The controller is operable to connect the heating element to the signal source input so as to allow an electric signal from the signal source to flow through the heating element in response to the actuator being moved to the actuated position thereof, thereby causing the heating element to generate and apply heat to the lead end portion of the solidified adhesive supply.
  • the controller is also operable to allow the electric signal to flow from the signal source through the heating element for a predetermined period of time after the actuator has been moved to the non-actuated position thereof, thereby causing the heating element to continue generating and applying heat to the lead end portion of the solidified adhesive supply for the predetermined time period and then subsequently allowing the heating element to cool.
  • a glue gun constructed in accordance with the principles of the present inventions provides a safe and effective solution to the problems associated with leaving known glue guns in an actuated condition. More specifically, the controller will automatically shut-off the heating element after a pre-determined period of time to prevent an unattended glue from becoming a safety hazard.
  • the glue gun of the present invention is advantageous over guns in which the heating element shuts-off immediately after releasing the actuator because the heating element continues to generate heat for a period of time after the actuator has been moved to its non-acutated position, thereby allowing the user to leave the gun unattended while attending to another task and then return to using the gun without waiting for the element to re-heat.
  • the controller is an electrical circuit, it is to be understood that the functions performed by the controller may be performed by any means now known or later developed, such as a microchip controlled or a internal timing clock controlled system.
  • Another aspect of the present invention relates to a timing circuit for controlling the amount of time an electric signal is supplied to an operative element from an electric signal source. It should be noted that this aspect of the present invention is not limited to glue guns and/or heating elements may be applied to a wide variety of electrically operated elements.
  • Available timing circuits typically comprise an integrated circuit that uses the 60 Hz frequency of an AC line voltage for establishing the required time period. Specifically, the line voltage is input into a multiplier and the basic unit of time drawn from the 60 Hz signal is multiplied to achieve the desired time period in the circuit.
  • the cost of such an integrated timing circuit is relatively high and precludes its incorporation into devices such as the glue gun of the present invention.
  • the present invention provides a timing circuit for controlling the amount of time an electric signal is supplied to an electrically powered operative element from an electric signal source.
  • the circuit comprises an input adapted to be connected to the electric signal source in power supplying relation.
  • the input is connected to the operative element.
  • a time constant circuit is operable to produce a timing circuit signal having a voltage V t i m i ng .
  • a reference voltage circuit is connect to the input.
  • the reference voltage circuit is operable to produce a reference signal having a voltage V ref .
  • a reset switch is selectively movable between (1) an actuated position wherein the reset switch allows the electric signal to flow from the signal source to the time constant circuit and (2) an non- actuated position wherein the switch prevents the electric signal from flowing to the time constant circuit.
  • An operational amplifier has a non- inverting terminal and an inverting terminal. One of the terminals receives the timing circuit signal from the time constant circuit and the other terminal receives the reference signal from the reference voltage circuit. Preferably, the non-inverting terminal receives the timing circuit signal and the inverting terminal receives the reference signal.
  • the operational amplifier is operable to produce a control signal proportional to the difference between V tlm ⁇ ng and V ref .
  • a switching element is connected to the operational amplifier and receives the control signal therefrom.
  • the switching element is movable between (1) a flow permitting position wherein the switching element allows the electric signal to flow from the signal source to the operative element and (2) a flow preventing position wherein the switching element prevents the electric signal from flowing from the electric signal source to the operative element.
  • the switching element is operable to move to the flow permitting position thereof when the control signal is high as a result of V t ⁇ rmng being greater than V ref and to move to the open position thereof when the control signal is low as a result of V t ⁇ rmng being equal to V ref .
  • the time constant circuit is operable to become energized when the reset switch is moved to the actuated position thereof such that, after the reset switch is moved to the non-actuated position thereof, the time constant circuit will continue to supply the timing circuit signal to the one terminal of the operational amplifier.
  • the time constant circuit is operable such that the voltage Vu mmg of the timing circuit signal will decay over a period of time until the timing equals V ref , thereby causing the switching element to move to the flow preventing position thereof and preventing the electric signal from flowing to the operative element.
  • timing circuit constructed in accordance with the present invention offers a low-cost and simplified alternative to presently available integrated timing circuits. It is to be understood that the applications of the timing circuit of the present invention is not to be limited to the glue gun disclosed and may be applied broadly to any electrically powered operative elements.
  • FIG. 1 is a perspective view of the glue gun of the present invention
  • Figure 2 is a side elevational view of the glue gun shown in FIG. 1 ;
  • Figure 3 is a section view taken along the line 3-3 of FIG. 2;
  • Figure 4 is a function block diagram of the auto shut-off circuit of a preferred embodiment of the present invention.
  • Figure 5 is a schematic diagram of the auto shut-off circuit of the preferred embodiment of the present invention.
  • Figure 6 is an illustration of the dynamic waveforms encountered in the operation of the preferred embodiment of the present invention.
  • Figure 7 is an cross-sectional view of the pusher utilized in the glue gun of Fig. 1.
  • FIG. 1 shows a glue gun, generally indicated at 10, constructed in accordance with the present invention.
  • the gun 10 includes a housing 12 constructed of two housing halves 20, 22 preferably molded of plastic.
  • the housing 12 has a front portion 26 in which a heating element 80 and interior surfaces defining a chamber 27 (shown in FIG. 3) are located.
  • the chamber 27 is defined by the interior surface of a flexible adhesive receiving sleeve 25, preferably made of rubber, and the interior surface of a tubular portion extending through the heating element 80.
  • the chamber 27 is cylindrically shaped and adapted for receiving a generally cylindrical stick of solidified adhesive.
  • the heating element 80 surrounds a forward end portion of the chamber 27 proximal a nozzle 18.
  • the nozzle 18 is connected to the housing 12 and has an opening fluidly communicated to the chamber 27 and so as to allow adhesive melted in the chamber 27 by the heating chamber 80 to flow outwardly onto a workpiece.
  • a nozzle sleeve 28 is fixed to the exterior of the nozzle 18 adjacent the housing 12.
  • the nozzle sleeve 28 is made of flexible rubber and insulates the metallic nozzle to protect an operator from the heat which may flow through the nozzle from the heating element.
  • a manually engageable handle portion in the form of a pistol grip portion 14 is configured to be gripped comfortably by the user of the glue gun 10.
  • the glue gun 10 is manually operated and includes an actuator or trigger 16 that is pivotally connected to the housing 12.
  • the trigger 16 is configured to be conveniently actuatable by the index finger of the user's hand that is gripping the pistol grip 14.
  • a glue gun stabilizer 30 is pivotally attached by pivot pins 32 to the front portion of the housing 12. When the stabilizer 30 pivots from an inoperative position to an operative position, the user can rest the glue gun 10 on a flat surface such as a table or workbench such that the stabilizer 30 and a resting surface 34 of the pistol grip 14 cooperate to stably support the glue gun 10 in an upright position.
  • the stabilizer 30 and the resting surface 34 are configured in such a way that the glue gun 10 may be supported by the two structures in a "resting position." In the resting position, the nozzle tip 18 rests a short distance, approximately 1.25 centimeters, from the workpiece. It can be appreciated that the stabilizer 30 and resting surface 34 may be altered or modified to adjust the distance between the nozzle 18 and the workpiece in the resting position.
  • An adhesive pusher 36 has an open configuration with a generally cylindrical receiving bore 37 formed therethrough for receiving a solidified adhesive supply in the form of a generally cylindrical glue stick 42.
  • the pusher 36 is arranged within the housing 12 such that the bore 37 is generally coaxial with the chamber 27 so that the adhesive supply can be inserted into the bore 37 with the lead end portion thereof being positioned inside chamber 27.
  • the pusher 36 is constructed and arranged to push the solidified adhesive supply 42 disposed in the chamber 27 forwardly towards the nozzle 18, thus forcing the molten adhesive from the lead end portion of the supply outwardly from the opening in the nozzle 18.
  • the housing halves 20, 22 cooperate to define a generally circular opening 38 for receiving the generally cylindrical glue stick 42.
  • the pusher 36 also has a forwardly extending shield portion 39 with a generally semi-circular configuration.
  • the shield portion 39 is formed integrally with the pusher 36 and is positioned below the rubber sleeve 25. The positioning of the shield portion 37 allows it to slide under the sleeve during forward movement of the pusher 36 and shields the internal components of the glue gun 10 when the pusher is disposed rearwardly in its rear retracted position.
  • the pusher 36 also has a pair of laterally extending guide portions
  • a power cord 40 plugs into an electric signal source such as an AC wall outlet to provide electrical power to the glue gun 10.
  • the user can adjust the heating level of the heating element 80 to a high or low level using a heat level switch 41.
  • Figure 2 is a side elevational view of the glue gun 10 with the trigger 16 thereof in the non-actuated position and the stabilizer 30 shown in the inoperative position in solid lines and in its operative position in phantom.
  • the front end portion 26 of the housing 12 has an arcuate groove on each side thereof adjacent to the stabilizer 30 and the stabilizer 30 has a pair of inwardly extending projections which are slidably received in the grooves.
  • One end of each groove has a narrowed portion which releaseably locks the stabilizer projections in place to secure the stabilizer in its operative position.
  • Figure 3 is a section view taken along the line 3-3 of Figure 2.
  • the trigger 16 is rotatably attached to the housing 12 by pivot pin 50 and is biased towards the non-actuated position by a biasing spring 52.
  • An actuating arm 54 is connected between the trigger 16 and an engaging member 56 of the adhesive pusher 36.
  • the engaging member 56 is pivotally connected to the pusher 36 by a pin 58 and has an engaging portion 59 which faces into the bore 37.
  • the actuating arm 54, trigger 16 and engaging member 56 are constructed and arranged such that, as the operator moves the trigger 16 to its actuated position, the adhesive pusher 36 is drawn forward towards the heating element 80 by actuating arm 54.
  • the actuating arm 54 pivots the engaging member 56 in an engaging direction such that the engaging portion 59 thereof moves into engagement with the solidified adhesive 42 within the bore 37.
  • the forward movement of stick 42 causes any molten adhesive at the lead end portion to be forced outwardly from the nozzle 18.
  • the engaging portion has a ribbed surface engageable with the glue stick 42 to assist in gripping the stick and urging it forwardly.
  • a switching boss projecting from the trigger 16 engages a switch arm 60, which actuates switch 58 to enable an electric signal to flow through the heating element 80 to generate heat sufficient to melt the lead end portion of stick 42.
  • the switch 58 is turned off, and a controller 70 controls an amount of time that the electric signal flows through the heating element 80.
  • the heating element is of the PTC type and controlling the amount of time the signal flows will extend the useful life of the element 80.
  • the element 80 is not limited to being the PTC type.
  • the controller 70 will be described in more detail hereinafter.
  • a heating indicator 52 consisting of a neon bulb 62 or the like lights up when an electric is applied to the heating element 80 so that an operator can usually verify that the heating element 80 is activated. As the time determined by the controller 70 expires and the electric signal ceases to be supplied to the heating element 80, the heating indicator 52 turns off.
  • FIG. 4 provides a block diagram of a controller 70 constructed in accordance with the principles of the present invention.
  • the controller 70 is powered by an AC signal source 100, which provides an AC signal to an AC to DC converter 102.
  • a standard wall outlet typically provides the AC signal via the power cord 40.
  • the principles of the present invention are not limited to using an AC signal source for the power and may be practiced with a DC signal source.
  • the output of the AC to DC converter 102 is connected to a reset switch 104 and also to a reference voltage circuit 108.
  • the output of the reset switch 104 is connected to a time constant circuit 106.
  • the output t i m ing of the time constant circuit 106 is connected to the non-inverting terminal 112 of an operational amplifier 116, while the output of the reference voltage circuit 108 is connected to the inverting terminal 114 of the operational amplifier 116.
  • the operational amplifier 116 is connected in an open-loop configuration.
  • the output of the operational amplifier 116 leads to a semiconductor switch 118, the output of which leads to a coil 72 of a relay 119.
  • the output of the AC signal source 100 also leads to the heating element 80, which is connected between the AC signal source 100 and a switch 74 of the relay 119.
  • the AC to DC converter 102 comprises a first diode (Dl) having its cathode connected in series to a first resistor (RI). Between the output of RI and ground is connected a first capacitor (Cl) in parallel with a second diode (D2). A node voltage at the output of RI is defined at node 128 as V c j rcu i t .
  • D2 is preferably a zener-type diode with the cathode connected to RI and its anode connected to ground.
  • a second resistor (R2) is connected between RI and a first power supply terminal 147 of the operational amplifier 116. The second power supply terminal 148 of the operational amplifier 116 is connected to ground.
  • the AC current source is connected to the anode of Dl.
  • a reference voltage circuit 108 comprises a third resistor (R3) and a fourth resistor (R4) connected in series between the node 128 and ground to define a voltage divider.
  • a reference voltage V ref at node 134 is defined between R3 and R4.
  • V ref is input to the inverting terminal 1 14 of the operation amplifier 116.
  • a node 139 having a voltage V t ⁇ m ⁇ ng thereat.
  • the time constant circuit 106 comprises a fifth resistor (R5) and a second capacitor (C2) connected in parallel between the reset switch 104 and ground.
  • V tlmlng (the output of the time constant circuit 106) is input to the non-inverting terminal 112 of the operational amplifier 116.
  • the voltage at the output of the operational amplifier 116 is defined as V out and can be measured at node 152.
  • V out is input to the semiconductor switch 118, which comprises a silicone control rectifier (SCR) 154 and a third diode (D3).
  • D3 is preferably a zener diode having its cathode connected to the SCR 154.
  • the SCR 154 is controlled by the voltage V out from the operational amplifier. When V out is high, the SCR 154 supplies V c ⁇ rc t to the cathode of D3. With the voltage higher at the cathode of the D3, current flows through D3 and V c ⁇ rcu ⁇ t is supplied to the relay 119.
  • the relay 119 comprises a relay coil (Kl) 72 and a relay contact (El) 74.
  • the relay coil 72 is energized by V ⁇ rcult , the relay contact 74 is closed and current flows from the AC signal source to the heating element 80 through the relay contact 74 to ground.
  • the normally open time constant circuit 106 is responsive to the closure of the reset switch (SW) 104 connected to and actuated by the manually operable glue gun trigger 16.
  • the switch closure charges C2, also referred to as the timing capacitor, through R5 creating a voltage differential at the inputs 112, 114 of the operational amplifier 116.
  • the output of the voltage, V out is proportional to the difference between the voltages at the non-inverting terminal 112 and inverting terminal 116.
  • the voltage differential at the input terminals 112, 114 of the operation amplifier 116 generates a high output signal V out from the operational amplifier 1 16.
  • the output of the time constant circuit 106, V t ⁇ mmg , is applied to the non-inverting input 112 and the output of the reference voltage circuit, V ref , is applied to the inverting input 114 of the operational amplifier 116.
  • V out is input to the semiconductor switch 118 that controls the electro- mechanical relay 1 19.
  • the AC line voltage provides an AC signal to the heating element 80 of the glue gun 10 when the electrical relay contact 74 of the electro-mechanical relay 119 is closed.
  • the electrical relay switch 74 Upon opening the reset switch 104, the electrical relay switch 74 remains closed for a time period determined by the natural response or exponential decay from the initial voltage of the time constant circuit 106.
  • C2 and R5 govern the rate of decay according to the following formula:
  • V t ⁇ m ⁇ ng V(0) e ( - t/RC) (1)
  • R is the value of R5 in ohms
  • C is the value of C2 in farads.
  • FIG. 6 provides an illustration of the dynamic waveforms encountered in the operation of the preferred embodiment of the present invention.
  • Voltage readings are taken at four circuit nodes (TPl, TP2, TP3, TP4) as marked in Figure 5; the corresponding voltage readings are denoted as Vcrc mt , V t ⁇ m ⁇ ng , Vref, and V out .
  • Voltage V c ⁇ rC u ⁇ t represents an internal voltage value at node TPl
  • voltage V tIming represents the voltage at node TP2 which is associated with the timing signal generated by time constant circuit 106
  • voltage V ref represents the voltage of the reference signal created by the reference voltage circuit 108
  • V out represents the voltage of the control signal output by the operational amplifier 116.
  • Three time periods A, B and C along the horizontal axis of Figure 6 correspond to three operational stages of the glue gun.
  • the relative voltages measured on the vertical axis are plotted on different scales (e.g., TPl: 20V/cm, TP2: lOV/cm and TP4: 25V/cm).
  • Figure 6 illustrates qualitatively the time variation in the voltage levels during operation of the circuit.
  • Time period A represents the circuit operation after plugging in the glue gun 10 but prior to actuating the trigger 16 and closing the reset switch 104.
  • the first diode 120 conducts current on the positive half cycle and current flows through RI charging Cl and the zener diode D2 limits the voltage.
  • the resulting voltage at V c j rCu i t is approximately 44 volts.
  • the voltage drop across R2 reduces the voltage to the desired level to power the operational amplifier 116.
  • R3 and R4 form a voltage divider which divides V C i rCu it to provide the reference circuit signal with a V ref of approximately 1.3 volts.
  • V ref is applied to apply to the inverting terminal 114 of the central signal output by operational amplifier 116.
  • C2 Prior to actuating the trigger 16, C2 is discharged and the non-inverting input 112 of the operational amplifier 116 is held at ground via R5.
  • the voltage V out of the operational amplifier 116 therefore drops to a low value.
  • a low V out at the gate of the silicon gate rectifier (SCR) 154 prevents current from flowing from V C i rcuit to the relay 119, thus coil 72 is de-energized, switch 74 is open and current cannot flow from the AC signal source through the heating element 80.
  • SCR silicon gate rectifier
  • the reset switch 104 closes.
  • C2 charges up to approximately 30 volts, thus the voltage V t i m i ng of the timing signal is approximately 30 volts.
  • Charging C2 provides a voltage differential to cause the output of the operational amplifier 116 to go high, thereby activating the silicon control rectifier 154.
  • the silicon control rectifier 154 supplies V circuit to D3, thereby energizing the relay coil 72.
  • Energizing the relay coil 72 drops V c i rcuit to approximately 23 V and lowers V ref to approximately 0.63 V.
  • the relay contact 74 is closed and AC line voltage flows through the heater element 1 10 and generates heat to melt the lead end portion of the solidified adhesive supply.
  • Time period B represents the operation of the controller 70 after the user releases the trigger 16 and thus opens the reset switch 104.
  • the timing cycle begins as the timing capacitor 140 exponentially discharges its energy or voltage through the fifth resistor 138 according to the timing constant R5*C2.
  • V t ⁇ m ng drops below the reference voltage V ref by an amount determined by the operational amplifier's 116 output saturation voltage divided by its open loop gain, then V out drops to a low value thereby switching the silicon control rectifier 154 off.
  • the relay 119 drops out (i.e., the relay contact 74 opens), thereby stopping the flow of AC current through the heater element 80.
  • V tIming equals V ref then the differential voltage across the input terminals of the operational amplifier 116 will be approximately zero and the output of the operational amplifier 116 (V out ) will go low or be approximately zero.
  • the estimated time required to switch to the off or flow preventing condition is given by:
  • V (t) is the voltage at the timing capacitor or V t ⁇ m ⁇ ng
  • V 0 is the initial value of V t , ming when the reset switch is opened (i.e. non-actuated), or the trigger is released.
  • V out drops to approximately zero, thereby switching the silicon control rectifier 154 off.
  • the relay contact 74 opens preventing the AC current from flowing to the heating element 80.
  • the relay off condition causes voltage V c ⁇ rcu ⁇ t and voltage V ref to increase.
  • C2 will be re-charged (to approximately 30 V) with every closure of the reset switch 104, thereby resetting the timer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Soil Working Implements (AREA)

Abstract

L'invention concerne un pistolet à colle (10) qui permet de distribuer sélectivement un adhésif fondu. Le pistolet comprend un boîtier (12), un actionneur (16), pouvant passer d'une position actionnée à une position non actionnée et inversement, et un embout configuré de façon à laisser passer l'adhésif fondu. Le boîtier comprend une chambre de réception (27) de l'adhésif en communication fluidique avec l'embout. La chambre présente à l'une de ses extrémités un orifice qui permet d'y introduire un adhésif solidifié. Un élément chauffant (80), associé à la chambre, permet d'appliquer à l'extrémité avant de l'alimentation en adhésif solidifié une chaleur suffisante pour la faire fondre quand un signal électrique est appliqué audit élément. Un organe de commande de l'élément chauffant fait passer un signal électrique dans ce dernier pendant un certain temps après que l'actionneur a été mis en position non actionnée, puis empêche ledit signal électrique de traverser ledit élément à la fin dudit temps. L'invention concerne également une minuterie qui permet de commander la durée pendant laquelle un signal électrique est fourni à un élément fonctionnel.
PCT/US1998/026742 1997-12-16 1998-12-16 Pistolet a colle a arret automatique WO1999030837A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AU17277/99A AU737279B2 (en) 1997-12-16 1998-12-16 Auto shut-off glue gun
DE69814914T DE69814914T2 (de) 1997-12-16 1998-12-16 Automatisch ausschaltbare klebstoffpistole
EP98962120A EP1037715B1 (fr) 1997-12-16 1998-12-16 Pistolet a colle a arret automatique
JP2000538805A JP2002508246A (ja) 1997-12-16 1998-12-16 自動シャットオフ型接着銃
AT98962120T ATE240790T1 (de) 1997-12-16 1998-12-16 Automatisch ausschaltbare klebstoffpistole
CA002314082A CA2314082A1 (fr) 1997-12-16 1998-12-16 Pistolet a colle a arret automatique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US6974497P 1997-12-16 1997-12-16
US60/069,744 1997-12-16

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WO1999030837A1 true WO1999030837A1 (fr) 1999-06-24

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PCT/US1998/026742 WO1999030837A1 (fr) 1997-12-16 1998-12-16 Pistolet a colle a arret automatique

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EP (1) EP1037715B1 (fr)
JP (1) JP2002508246A (fr)
AT (1) ATE240790T1 (fr)
AU (1) AU737279B2 (fr)
CA (1) CA2314082A1 (fr)
DE (1) DE69814914T2 (fr)
WO (1) WO1999030837A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006066129A2 (fr) * 2004-12-17 2006-06-22 Black & Decker Inc. Ensemble pistolet a colle dote d'un indicateur de temperature et d'une base reduisant les fuites goutte a goutte
WO2008101455A2 (fr) * 2007-02-22 2008-08-28 Brämig, Sabine Pistolet à colle rapide à vitesse variable

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10369590B2 (en) 2016-03-10 2019-08-06 Acme United Corporation Glue gun
US10512932B2 (en) 2016-05-03 2019-12-24 Acme United Corporation Glue gun dispensing nozzle indicator

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4546235A (en) * 1982-05-03 1985-10-08 Hilti Aktiengesellschaft Device for melting and dispensing a thermoplastic adhesive
FR2595061A1 (fr) * 1986-03-01 1987-09-04 Buehnen Kg H Appareil applicateur, notamment appareil applicateur de colle fondue
US5362164A (en) 1993-09-23 1994-11-08 Electro-Matic Staplers, Inc. Glue gun heat housing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4546235A (en) * 1982-05-03 1985-10-08 Hilti Aktiengesellschaft Device for melting and dispensing a thermoplastic adhesive
FR2595061A1 (fr) * 1986-03-01 1987-09-04 Buehnen Kg H Appareil applicateur, notamment appareil applicateur de colle fondue
US5362164A (en) 1993-09-23 1994-11-08 Electro-Matic Staplers, Inc. Glue gun heat housing

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006066129A2 (fr) * 2004-12-17 2006-06-22 Black & Decker Inc. Ensemble pistolet a colle dote d'un indicateur de temperature et d'une base reduisant les fuites goutte a goutte
WO2006066129A3 (fr) * 2004-12-17 2006-10-26 Black & Decker Inc Ensemble pistolet a colle dote d'un indicateur de temperature et d'une base reduisant les fuites goutte a goutte
WO2008101455A2 (fr) * 2007-02-22 2008-08-28 Brämig, Sabine Pistolet à colle rapide à vitesse variable
WO2008101455A3 (fr) * 2007-02-22 2009-04-09 Braemig Sabine Pistolet à colle rapide à vitesse variable

Also Published As

Publication number Publication date
ATE240790T1 (de) 2003-06-15
DE69814914T2 (de) 2004-03-11
CA2314082A1 (fr) 1999-06-24
AU737279B2 (en) 2001-08-16
AU1727799A (en) 1999-07-05
EP1037715A1 (fr) 2000-09-27
JP2002508246A (ja) 2002-03-19
EP1037715B1 (fr) 2003-05-21
DE69814914D1 (de) 2003-06-26

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