Abstract:
A battery powered portable system of operating a tattoo gun that can be worn on the user&#39;s arm or clipped to the user&#39;s belt. The system directly connects to conventional tattoo guns, and offers the options of utilizing a fingertip control of the machine&#39;s speed and ON/OFF functions or the conventional control module and foot pedal controls.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to a device that can replace the power supply, control module and foot pedal operational switch that is used to operate a conventional tattoo gun. More particularly, to a battery powered portable system of operating a tattoo gun that can be worn on the user&#39;s arm, offers fingertip control of the machine&#39;s speed and ON/OFF functions, and can be directly substituted in place of the detachable power cord found in the industry standardized tattoo machines. 
     A conventional, prior art tattoo machine has four major components; a tattoo gun, an operational foot switch, a connector cable, and a control unit. The control unit is a bulky enclosure that is connected to an AC power source and has an AC/DC transformer that outputs DC power to a small DC oscillating motor located on the tattoo gun that rapidly strokes the inking needle. The voltage of the DC power output is manually adjusted on the control unit to change the speed of the motor. The operational foot switch allows DC power to the tattoo gun through the connector cable. In operation, the tattoo artist has to go back and forth between the control unit to adjust the needle speed and has to start and stop the needle with the foot pedal. This is awkward to operate and the artist is somewhat constrained by the length of the connector cable. 
     There are newer DC operated portable tattoo machines available but these have problems. They are sold as complete units that are very expensive. Additionally, most tattoo artists work and develop their artistic skills with the same tattoo guns for years and are accustomed to the weight, balance, feel and response of that gun. They are not inclined to change. The retrofit control system and power supply is an electronic DC power supply unit with interchangeable batteries that has an LCD visual interface, a spring loaded tattoo gun connection clip with a speed adjustment means thereon, and a fingertip microswitch that can be removably mounted on the tattoo gun where the artist prefers. It is small and light enough to be worn on the arm of the tattoo artist in an elastic pouch. 
     The retrofit control system and power supply fulfills a long felt need in the field of tattoo machines. It allows tattoo artists freedom of movement, portability, fingertip control of the gun&#39;s operation and speed, and a visual status of battery condition and operating parameters. This new invention utilizes and combines known and new technologies in a unique and novel configuration to overcome the aforementioned problems of the prior art. 
     SUMMARY OF THE INVENTION 
     The general purpose of the present invention, which will be described subsequently in greater detail, is to provide a retrofit control and DC power supply system that is able to connect to existing tattoo guns without any modifications. It has many of the advantages mentioned heretofore and many novel features that result in a new invention which is not anticipated, rendered obvious, suggested, or even implied by any of the prior art, either alone or in any combination thereof. 
     In accordance with the invention, an object of the present invention is to provide an improved retrofit control and DC power supply system for a tattoo gun that is small and light enough to be worn on the arm or clipped to a belt. 
     It is another object of this invention to provide an improved retrofit control and DC power supply system for a tattoo gun capable of uninterrupted operation through the use of multiple rechargeable, replaceable batteries. 
     It is a further object of this invention to provide a retrofit control and DC power supply system for a tattoo gun that gives the artist a visual status of the battery condition and the tattoo gun speed setting. 
     It is still a further object of this invention to provide for a retrofit control and DC power supply system for a tattoo gun that incorporates an ON/OFF switch that may be removably mounted on the barrel of the gun. 
     The subject matter of the present invention is particularly pointed out and distinctly claimed in the concluding portion of this specification. However, both the organization and method of operation, together with further advantages and objects thereof, may best be understood by reference to the following description taken in connection with accompanying drawings wherein like reference characters refer to like elements. Other objects, features and aspects of the present invention are discussed in greater detail below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a top view of the retrofit control and DC power supply system connected to a tattoo gun in the conventional configuration showing the general arrangement of all components; 
         FIG. 2  is a top view of the retrofit control and DC power supply connected to a tattoo gun in the preferred configuration showing the general arrangement of all components; 
         FIG. 3  is a side view of the retrofit control and DC power supply system control unit and removable battery; 
         FIG. 4  is a perspective view of the retrofit control and DC power supply system control unit with installed battery and the elastic arm strap; 
         FIG. 5  is the electrical schematic for the retrofit control and DC power supply system; 
         FIG. 6  illustrates the alternate embodiment retrofit control system and power supply for a tattoo gun with the side cover plate on; 
         FIG. 7  illustrates the alternate embodiment retrofit control system and power supply for a tattoo gun with the side cover plate removed; and 
         FIG. 8  illustrate the alternate embodiment retrofit control system and power supply for a tattoo gun prior to installation on a tattoo gun. 
     
    
    
     DETAILED DESCRIPTION 
     There has thus been outlined, rather broadly, the more important features of the invention in order that the detailed description thereof that follows may be better understood and in order that the present contribution to the art may be better appreciated. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject matter of the claims appended hereto. 
     In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of descriptions and should not be regarded as limiting. 
     The retrofit control and DC power supply system (system) is configured in a conventional embodiment  4  ( FIG. 1 ) and a preferred embodiment  2  ( FIG. 2 ). Each of these embodiments utilize the same control unit  6  and the same tattoo gun  8  but differ in the components connected to these. The conventional system  4  has a jack connectable foot switch  10  and a jack connectable first spring clip power cable  12 . Although each of these are shown connecting to the control unit  6  with input jack connectors  14  it is well known in the art that there is a plethora of electrical connectors or hard wiring that would accomplish the same task. The preferred embodiment system  2  has only a pin connector attached second spring clip power cable  13  connected to a spring clip power connector  40  with a removably connected tactile remote switch  15  attached thereto. 
     The control unit  6  utilized in each of the embodiments has an outer casing that houses the printed circuit board with the operational circuit components thereon, a battery  16 , the first spring clip power control cable pin connector  20 , the second spring clip power cable jack connector  24 , the foot switch cable jack connector  22 , the display interface  26 , the power button  30 , the battery status indicator button  31  and the speed (tattoo gun voltage) control buttons  32 . The outer casing has a belt clip  28  affixed to its bottom face. The operational circuit  34  ( FIG. 5 ) that is used in both embodiments is identical although different electrical pathways are utilized for the operation of the foot switch  10  and the speed control buttons  32  versus the tactile switch  15  and the speed adjustment potentiometer  35 . 
     Looking at  FIG. 3  it can be seen that the replaceable, rechargeable battery  16  slideably engages into control unit  6  so as to matingly connect their electrical contacts as is well known in the industry and not illustrated. When the electrical contacts are engaged fully the battery  16  and control unit  6  are a mechanically interlocked solid unit. This is accomplished through the use of physically engageable configurations which require the depression of unlock buttons  18  on the battery  16  as is well known in the field of battery powered devices and not discussed or illustrated in detail herein. 
     In the preferred embodiment  2  the first spring clip power control cable  13  plugs into spring clip power connector  40  that houses thereon a tactile switch  15  (that is used rather than the foot control switch  10 ) and a speed adjustment potentiometer  35  (that is used rather than speed control buttons  32 .) The first spring clip power control cable  13  has conventional pin connectors on both its distal and proximate ends that connect to the control unit  6  and the spring clip power connector  40 . The spring clip power connector  40  has a pair of spring loaded arms  42  that open and close to engage a pair of matingly conformed contactors  44  that are located on the gun  8  and provide the power to the gun. It also has a speed adjustment potentiometer  35  integrated therein and a detachable tactile switch  15  connected by plug connector halves  46 . The tactile switch  15  switches on and off the power to the gun  8  and is mountable anywhere on the gun  8  by mechanical means such as rubber bands, cable ties, glue or screws, however the likely location for mounting would be the top surface of the tattoo gun&#39;s barrel where the artist&#39;s index finger could readily access it. When in the preferred configuration, the speed control buttons  32  do not function as this function is now operated through the speed adjustment potentiometer  35 . The preferred embodiment  2  does not have the foot switch  10  or the second spring clip power cable  12  plugged into the control unit  6 . 
     The preferred embodiment unit  2  is retrofit onto a conventional tattoo machine by simply disengaging the conventional spring cable and engaging the distal end of the first spring clip power control cable  14  into the spring clip power connector  40 , then manipulating the pair of spring loaded arms  42  to engage the contactors  44  on the tattoo gun  8  the connecting the proximate end of the first spring clip power control cable  14  to a control unit  6  with an operable battery  16  installed. Finally, the tactile switch  15  is coupled to the spring clip power connector  40  via the plug connector halves  46  and mechanically affixed to the tattoo gun  8 . 
     In operation, the preferred embodiment  2  once connected is switched on via the power indicator button  30 , and the battery status button  31  is depressed to display the battery voltage, then depressed again to display the tattoo gun voltage in the display interface  26 . The preferred embodiment  2  is slid into the elastic pocket  48  on the elastic arm band  50  such that the display interface  26  is visible, and then the entire unit is slid onto the artist&#39;s arm. (Optionally the entire unit may be clipped onto the artist&#39;s belt.) The artist adjusts the speed adjustment potentiometer  35  to adjust the voltage to make the tattoo gun  8  operate at the desired speed and then depresses the tactile switch  15  as needed to ink the patron. In this preferred embodiment the speed control buttons  32  are electronically bypassed and the potentiometer  35  handles this function. 
     The conventional embodiment unit  4  is retrofit onto a conventional tattoo machine by simply engaging the jack  14  on the first spring clip power cable  12  into the spring clip power cable jack connector  24 , and engaging the jack  14  on the foot switch  10  into the foot switch cable jack connector  22  on control unit  6  since the spring clip  9  is already connected to the conventional tattoo machine it came from. 
     In operation, the conventional embodiment  4  once connected is switched on via the power indicator button  30 , and the battery status button  31  is depressed to display the battery voltage, then depressed again to display the tattoo gun voltage in the display interface  26 . The preferred embodiment  2  is slid into the elastic pocket  48  on the elastic arm band  50  such that the display interface  26  is visible, and then the entire unit is slid onto the artist&#39;s arm. (Optionally the entire unit may be clipped onto the artist&#39;s belt.) The artist adjusts the speed adjustment buttons  32  to make the tattoo gun  8  operate at the desired speed as indicated on the display interface  26  and then depresses the foot switch  10  as needed to ink the patron. In this conventional embodiment  4  the speed control buttons  32  and the foot switch  10  operate to allow the inking of the patron. 
     The operational circuit  34  is best described looking at  FIG. 5 . Power comes in from the battery source  52  via the main power electronic switch  30  through ON/OFF relay  54  to the first voltage regulator  56  and then to the second voltage regulator  58 . The circuit is completed (energized) to allow power to the spring clip power connector  40  (and tattoo gun  8 ) by either of the grounding out of current through the gun trigger switch  11  or the foot pedal  10 . The first voltage regulator  54  adjusts the operating voltage of the control unit  6  for the operation of the voltmeter  60  and the solid state switches thereon. The second voltage regulator  56  maintains a stable voltage for the operation of the tattoo gun  8  (maintains constant voltage as the battery power is dissipated.) Power taken across voltmeter  60  provides a voltage readout of the battery condition or of the actual output power to the tattoo gun  8  by operation of battery status button  31 . Power then proceeds through a transistorized voltage regulator  62  that adjusts the speed of the gun. This is a three prong regulator that has the middle prong connected to a potentiometer that adjustably bleeds the voltage to ground. (This is the potentiometer that is integrated into the spring clip power connector  40  or the speed adjustment buttons  32  built into the control unit  6 .) Power then proceeds to the switching relay  64  that is energized to allow the circuit to complete through the tattoo gun motor after the ON/OFF power switch  30  or foot pedal  10  is activated. 
     The voltage is capped (limited) by the first voltage regulator  56 . An internal voltage regulating potentiometer  63  adjusts the power going to the tattoo gun  8  such that it does not exceed the max voltage needed to run the tattoo gun  8 . 
     Eventually it may be possible to mount the control unit/battery assembly to the gun itself as batteries miniaturize and the vibrate coils/relays of the gun become more efficient, requiring less voltage to operate. At this time to accomplish such a task would make a tattoo gun that is too bulky, heavy and unwieldy to work with. 
     The conventional method of vibrating the tattoo gun&#39;s needle utilizes a rapidly moving coil wrap motor. This coil can be replaced by stacked arrangement of piezoelectric motors  71  (piezo stacker electric motor) or a conventional motor and flywheel assembly that would still vibrate the needles in an up and down motion by the rapid vibration of a moveable bar connected mechanically to the needles. 
       FIGS. 6 ,  7  and  8  illustrate the alternate embodiment retrofit control system  100  and power supply for a tattoo gun with the side cover plate on, with the side cover plate removed and prior to installation on a tattoo gun  8 . In this embodiment the retrofit system  100  is self contained in case that is directly mounted onto the tattoo gun&#39;s  8  main support frame  102  by mechanical fasteners, preferably screws or nuts and bolts. The system case has a support base  73  from which a vertical support  108  extends normally. The system  100  is mounted on the gun  8  in place of the original magnetic coils. A voltage and frequency generator  72 , the battery  16  and the piezo stacker electric motor are mounted in the system case  104  below the drive arm  74  which swings about the pivot  75  on the vertical support  108 . The electronics (which function essentially similar to those of the preferred embodiment described herein and are also mounted onto a printed circuit board) reside on the case panel  110  on the side of the system case  104 . The system electronics include main power electronic switch  30 , display interface  26 , battery status button  31  and needle speed control  32 . Similar to the preferred embodiment, tactile switch  15  switches on and off the power to the gun  8  and is mountable anywhere on the gun  8  by mechanical means such as rubber bands, cable ties, glue or screws, however the likely location for mounting would be the top surface of the tattoo gun&#39;s barrel  112  where the artist&#39;s index finger could readily access it. A screw adjust means  70  affixed to the support base  73  adjusts the tension on spring  73  that controls the rebound of the drive arm  74  to adjust the force and speed of the needle. 
     The mechanical oscillation to drive the tattoo gun needle is generated by voltage coming from the battery  16  that enters the voltage/frequency regulator  72 . There is a DC square wave generated at a frequency and voltage set by the user though needle speed control  32 . This DC square wave of current travels to the piezo stacker motor  71  which expands vertically as the positive voltage is applied, and returns to its neutral (or compressed) thickness when the voltage returns to zero. When the piezo stacker motor  71  expands it pushes on the drive arm  74  with its fulcrum body  118  causing it to swing about pivot  75 . The proximity of the fulcrum body  118  to the pivot  75  multiplies the movement of the piezo motor at the distal end of the drive arm  74 . This oscillating movement is transmitted to the needle by virtue of the connection between the distal end of drive arm  74  and the distal arm of the needle  120 . 
     It is to be noted that with this system the piezo stacker motor  71  only withdraws the needle and the screw adjuster means  70  and spring  73  control the insertion of the needle. 
     It is well known it the art that the location of the peizo electric motor  71  may be varied to different locations in the case (I.E. above the drive arm  74  to drive the arm down or on an section of the drive arm  74  extending beyond the pivot  75  to pivot it down.) Different spring locations and/or types may be used and batteries may be mounted in different locations depending on weight size and balance. 
     The above description will enable any person skilled in the art to make and use this invention. It also sets forth the best modes for carrying out this invention. There are numerous variations and modifications thereof that will also remain readily apparent to others skilled in the art, now that the general principles of the present invention have been disclosed. As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.