JP2005081223A - Automatic spray apparatus of aerosol can - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic spray apparatus of an aerosol can, easily attachable to and detachable from the aerosol can, requiring a small installation space, and usable for a long term. <P>SOLUTION: The automatic spray apparatus 10 is freely detachably attached to the upper part of the aerosol can 1 and sprays the contents contained in the aerosol can 1 when a spray nozzle 5 is pushed by a protuberance 33 of a driving cam 32 rotated by a motor 30. The spray apparatus is equipped with an outer case part 40 having, as the basic shape, a cylindrical shape with an outer diameter about the same as that of the aerosol can 1 and is attached to a pressure bonding ring part 3 on the outer periphery of the spray nozzle 5 of the aerosol can 1 by engaging a clamping nail 26. The spray nozzle 5 is equipped with a spray fixture 6 for changing the spray direction from upward to sideward. The driving cam 32 rotates in the horizontal direction and its protuberance 33 protuberant downward pushes the spray nozzle. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an apparatus for automatically spraying the contents of an aerosol can, and in particular, it is easy to operate with a simple configuration and can be easily attached to and detached from the upper portion of the aerosol can. The present invention relates to an aerosol can automatic spraying apparatus capable of spraying a fragrance.

Conventionally, as a technique for spraying an insecticide or the like built in this type of aerosol can, the automatic spraying device main body used in the method for controlling flying insects described in Patent Document 1 includes an aerosol and an automatic spraying device main body. The automatic spraying device body is provided with a motor and a driving force conversion device for converting the driving force of the motor into a vertical movement and interlocking the vertical movement with the push button of the aerosol. The driving force conversion device is for converting a rotary motion by a motor into a vertical motion.
JP 2002-220301 (paragraphs [0029] to [0031], FIG. 1)

  By the way, the automatic spraying device main body used in the method for controlling flying insects having the above structure has an outer shape larger than that of the aerosol can, and is provided with an aerosol support plate and a cradle for supporting the aerosol. There was a problem of becoming. In addition, since the mounting of the aerosol is accommodated in the apparatus main body, the mounting operation is complicated, and the used aerosol cannot be easily removed, which makes the operation complicated.

  The present invention has been made in view of such problems, and the object of the present invention is to provide an aerosol that can be easily attached to and detached from an aerosol can and can be downsized to reduce the installation space. The object is to provide an automatic spraying device for cans. Another object of the present invention is to provide an automatic spray device for an aerosol can which can be easily installed anywhere because the installation space is small and can be used for a long period of time with a stable spraying operation.

  In order to achieve the above object, an aerosol can automatic spraying apparatus according to the present invention directly attaches a spray nozzle to a top of an aerosol can by means of a protrusion of a drive cam that is rotated by a motor through a speed reduction mechanism. This is a device for spraying the contents contained by pressing indirectly or indirectly, the device having a basic shape of a cylindrical shape having an outer diameter substantially equal to the outer diameter of the aerosol can. It is mounted by engaging with a pressure-bonding ring portion on the outer periphery of the spray nozzle. It is preferable to provide a plurality of attachment claws that engage with the outer periphery of the crimp ring portion. The protrusion of the drive cam may directly press the spray nozzle, or may indirectly press it through a spray jig or the like.

  The aerosol can automatic spraying device of the present invention configured as described above is detachably mounted, for example, by engaging a mounting claw on the pressure-bonding ring portion on the outer periphery of the spray nozzle of the aerosol can. Therefore, it can be compactly attached to the upper part of the aerosol can, and the installation space can be reduced. Moreover, it can be easily attached to and removed from the aerosol can.

  As a preferred specific embodiment of the aerosol can automatic spraying device according to the present invention, the spray nozzle includes a spray jig for changing the spray direction from the upper side to the side, and the drive cam rotates in the horizontal direction. The spray jig is pressed by a projecting portion projecting downward. According to this structure, since the spray nozzle is pressed from above through the spray jig with the protrusion protruding downward from the drive cam that rotates in the horizontal direction and sprayed to the side, the spraying mechanism is flattened. Can be downsized.

  Furthermore, as another preferred specific aspect of the aerosol can automatic spraying device according to the present invention, the drive cam is a high-level cam surface protruding from a low-level cam surface on a circumferential track centering on the rotation center thereof. And a protrusion having an inclined cam surface connecting the high level cam surface and the low level cam surface, and the contents are sprayed while the spray nozzle is in contact with the high level surface. According to this structure, the drive cam can be rotated by the rotation of the motor, and the spray jig of the aerosol can can be pushed by the high level cam surface to spray the contents contained in the can. The length of the high-level cam surface can be increased to increase the spray amount by pushing the spray nozzle, and the high-level cam surface can be separated from the spray jig and the spray jig can be opposed to the low-level cam surface. Can be stopped. In this way, it is possible to easily change the spray time, spray interval, and spray amount.

  In the aerosol can automatic spray device according to the present invention, the inclined cam surface of the drive cam that transitions from the low level cam surface to the high level cam surface has a gentle gradient, and the inclined cam surface that transitions from the high level cam surface to the low level cam surface. Preferably has a steep slope. According to this configuration, the spray jig is gradually pushed by the inclined cam surface with a gentle gradient to spray the contents, so that the spray operation is stable, and even after the motor torque is small, stable spray can be performed. Since the spraying stops at the steeply inclined cam surface, the stopping operation can be quickly performed and the spraying operation is stabilized.

  As described above, according to the present invention, the automatic spraying device can be easily mounted on the upper portion of the aerosol can, can be easily removed, and the installation space can be reduced. Further, the automatic spraying device is mounted on the upper part of the aerosol can, and has an outer diameter substantially the same as the outer diameter of the aerosol can and has a cylindrical shape as a basic shape, so it can be easily carried and has excellent operability. Further, the size can be reduced with a simple configuration, and the contents can be sprayed in a stable state. And since it comprised so that it might mount | wear to a small diameter crimping | compression-bonding ring part, it can mount | wear also to the aerosol can from which an outer diameter differs.

  Hereinafter, an embodiment of an aerosol can automatic spraying apparatus according to the present invention will be described in detail with reference to the drawings. First, the aerosol can 1 will be described with reference to FIG. 1A and 1B show an aerosol can, in which FIG. 1A is a perspective view of a main part, FIG. 1B is a cross-sectional view of the main part, and FIG. 1C is a perspective view of a main part in which a spray jig is attached to a spray nozzle.

  In FIG. 1, an aerosol can 1 is provided with a cylindrical container 2 that is open at the top and is closed at the bottom, and a lid 4 having a crimping ring portion 3 that is reduced in diameter at the top opening has an outer periphery. The spray nozzle 5 protrudes from the center of the lid 4. The crimping ring portion 3 is formed to have a small diameter by caulking the inner lid 4 a to the lid body 4, and a step portion 3 a is formed on the entire lower periphery. Inside the aerosol can 1, liquids such as insecticides, fragrances, and repellents are injected as contents to maintain a high pressure state. The spray nozzle 5 is configured to be pushed downward and biased upward. When the spray nozzle 5 is pushed, the internal liquid is sprayed, and when the push is released, the spray protrudes upward and stops spraying. . The aerosol can 1 itself has a normal configuration with an outer diameter of about 66 mm, and has no particular feature.

  A spray jig 6 for changing the spray direction is fixed to the tip of the spray nozzle 5 of the aerosol can 1 in a press-fitted state. The spray jig 6 includes a base body 6a fixed to the spray nozzle 5 in a press-fitted state, a rotating body 6b that protrudes and rotates from a side surface of the base body, and a swinging body that is connected and swingable so as to be orthogonal to the rotating body. 6c and a spray pipe portion 6d connected to the rocking body, and a passage through which gas and liquid can flow is formed at the center of each member. At the top of the base body 6a, an operating protrusion 7 that protrudes from a protrusion of a drive cam, which will be described later, protrudes. This operating protrusion is preferably a part of a spherical surface. With the spray jig 6 configured in this manner, the spray direction of the normal aerosol can 1 is upward, whereas the rotating body 6b is rotated and the swinging body 6c is swung to change the spraying direction to an arbitrary direction. Can be changed.

  Next, the automatic spray device 10 will be described in detail. FIG. 2 is a front view, a side view, and a plan view of an aerosol can automatic spraying apparatus according to the present embodiment, and FIG. 3 is a perspective view of a main part showing an internal structure in a state in which the automatic spraying apparatus is removed from the aerosol can. 4 is a perspective view of the state where the automatic spraying device is mounted on the aerosol can, and FIG. 5 is a cross-sectional view of the main part showing the internal structure of the state where the automatic spraying device is mounted on the aerosol can. Note that a part of the reduction gear train in FIG. 3 is omitted.

  2 to 5, the automatic spraying apparatus 10 basically includes a mechanism unit 20 including a power supply unit 11 and an exterior case unit 40 that houses the power supply unit and the mechanism unit. The exterior case unit is an aerosol can 1. The basic shape is a cylindrical shape having an outer diameter substantially equal to the outer diameter. First, the power supply part 11 located in the upper part of the mechanism part 20 which is the center part of the automatic spraying apparatus 10 is demonstrated. The power supply unit 11 includes a substrate 12 constituting a drive circuit and a battery holder 13 positioned above the substrate, and the substrate 12 is fixed on the upper plate 21 of the mechanism unit 20, and the battery holder is disposed above the substrate 12. 13 is fixed. The battery holder 13 is provided with a lever-type power switch 14, and the spraying operation is performed by turning on the power by swinging the lever.

  An IC chip and electric elements (both not shown) are fixed on the substrate 12, and in this embodiment, an electric circuit for generating a signal at a predetermined spraying time interval and rotating a motor is incorporated. Further, an LED 15 is fixed on the substrate 12 as a display device indicating that the spraying operation is on standby, and a slide switch 16 for setting a spray time interval is fixed. The battery holder 13 is of a type in which two AA batteries 17 can be inserted in series. However, the battery holder 13 is not limited to this type, and a button battery or the like can be used. Further, the switch is not limited to the lever type, and an appropriate one such as a slide type or a push type can be used.

  Next, the mechanism unit 20 will be described in detail. The mechanism unit 20 has a two-stage configuration of an upper plate 21 and a lower plate 22, and the upper plate 21 and the lower plate 22 are connected and fixed at intervals by a plurality of connecting columns 23. The upper plate 21 and the lower plate 22 are made of plastic, and the upper plate 21 has a shape obtained by cutting a part of a circular shape with a straight line, and the diameter of the circular portion is set smaller than the diameter of the outer periphery of the aerosol can 1. A bearing portion and a concave portion for fixing a reduction gear train constituting a reduction mechanism described later are formed on the lower surface side.

  The lower plate 22 is provided with a circumferential wall portion 24 surrounding the outer periphery of the crimping ring portion 3 as an attachment portion to the aerosol can 1. The circumferential wall portion is provided with the spray nozzle 5 and the spray jig 6 of the aerosol can 1. Has a notch 25 through which can pass. Thereby, the spray nozzle 5 and the spray jig 6 can be received through the notch 25 to the center of the lower plate 22. The circumferential wall portion 24 has an inverted L shape so as to surround the crimping ring portion 3, and three attachment claws 26 are formed in the circumferential wall portion 24. The attachment claw 26 is formed integrally with the lower plate 22, and a claw portion 26 a that engages with the stepped portion 3 a of the crimping ring portion 3 of the aerosol can 1 from the outside protrudes toward the inside. The base portion 26 b is curved outward and can be engaged with the stepped portion 3 a of the pressure-bonding ring portion 3.

  The mechanism unit 20 includes a motor 30 fixed to the upper plate 21, a reduction gear train 31 that reduces the rotation of the motor, and a drive cam 32 that rotates at a reduced speed. The drive cam 32 includes an aerosol can 1. A projection 33 for pushing the spray nozzle 5 is formed in a circumferential shape. The motor 30 has a flat shape and has a rotation shaft parallel to the spray nozzle 5, the drive cam 32 rotates in the horizontal direction, and the protrusion 33 protrudes downward in the vertical direction.

  FIG. 6 is a bottom view showing the reduction gear train. The reduction gear train 31 is disposed between the upper plate 21 and the lower plate 22, and has a small gear 31a fixed to the rotating shaft of the motor 30 and three reduction gears 31b. To 31d and one transmission gear 31e. A driven gear 32 a on the outer periphery of the drive cam 32 is decelerated and rotated by a reduction gear train 31 composed of these reduction gears and transmission gears. The drive cam 32 is in a vertical direction parallel to the spray nozzle 5. It is rotated around the rotation axis. In this embodiment, the motor 30 is a small DC motor.

  7 is a front view, a rear view, a cross-sectional view, and a cam diagram showing the drive cam. The drive cam 32 is formed integrally with the driven gear 32a, and the protrusion 33 is spaced from the spray nozzle 5 of the aerosol can 1. And a high level cam surface 33a for spraying the contents by directly or indirectly pressing the spray nozzle 5, and having a drive cam 32. In the rotational direction, the inclined cam surface 33b from the low level cam surface to the high level cam surface is set to a gentle gradient, and the inclined cam surface 33c from the high level cam surface to the low level cam surface is set to a relatively steep gradient. The low level cam surface 32 b, the high level cam surface 33 a, and the inclined cam surfaces 33 b and 33 c are formed on a circumferential track centering on the rotation axis of the drive cam 32.

  The drive cam 32 is configured to rotate once in, for example, 5 to 10 seconds, and is set to complete one spraying operation in one rotation. The spray interval can be set by the timing of one rotation, and the spray time can be set by the length of the high level cam surface 33a of the drive cam 32 or the rotation speed. While the operation protrusion 7 of the spray jig 6 is positioned on the high level cam surface 33a of the drive cam 32, the high level cam surface presses the operation protrusion 7, and the operation protrusion is caused by the height of the rotating cam surface. 7 is pushed. Thus, by the structure which presses the spray jig | tool 6 with the protrusion 33 of the drive cam 32 which rotates horizontally, the mechanism part 20 can be made into a flat thin structure, and an overall height can be comprised low. The spray nozzle 5 and the spray jig 6 can enter the central portion of the mechanism portion 20 through the notch 25 of the lower plate 22, and the protrusion 33 of the drive cam 32 is the operation protrusion of the spray jig 6 at the center of the mechanism portion 20. 7 is in contact with the structure. The time required for one rotation of the drive cam is not limited to the above time and can be arbitrarily set.

  The exterior case part 40 has a cylindrical container shape with a lower opening, covers the power supply part 11 and the mechanism part 20, and is attached to the power supply part 11 and the mechanism part 20, and is attached to the cylindrical part. The outer diameter substantially matches the outer diameter of the aerosol can 1. The outer case part 40 is formed with an accommodation space 41 for the electric holder 13 and the battery 17 in the upper part, and has a shape that does not protrude from the cylindrical outer peripheral surface of the basic shape. In addition, you may comprise so that a battery cover for battery mounting may be provided in the upper part of an exterior case part, and when a battery is small, it is not necessary to project an accommodation space.

  The exterior case portion 40 is formed with an opening 42 through which the spray jig 6 protrudes to the outside, and an opening through which the power switch 14, the LED 15, and the slide switch 16 are exposed. When the battery is inserted into the battery holder 13, the outer case part 40 is removed to expose the battery holder 13 on the upper plate 21. For example, two AA batteries 17 are inserted before the outer case part 40 is covered. The battery holder 13 includes a switch lever for the power switch 14, and the switch lever protrudes upward from the outer case 40.

  The operation of the automatic spray apparatus of the present embodiment configured as described above will be described below. For example, when it is desired to spray the contents of the aerosol can 1 periodically, the automatic spray device 10 is mounted on the upper portion of the aerosol can 1. That is, as shown in FIG. 3, the lower opening of the outer case 40 is positioned at the upper part of the aerosol can 1, and the circumferential wall 24 is formed on the outer periphery of the pressure-bonding ring 3 through the spray jig 6 through the notch 25 of the lower plate 22. The outer case 40 is pressed downward. By this pressing, the circumferential wall portion 24 surrounds the pressure-bonding ring portion 3, the attachment claw 26 is curved outward, the claw portion 26 a is engaged with the step portion 3 a, and the automatic spray device 10 is attached to the aerosol can 1. Complete. Thus, the mounting operation can be performed very easily. In general, even when aerosol cans have different outer diameters, the shape of the pressure-bonding ring portion is substantially the same, and the automatic spray device 1 can be easily mounted on aerosol cans having different outer diameters.

  Thereafter, the spray direction of the contents is set. That is, as shown in FIG. 8, the direction is set by rotating or swinging the spray jig 6. In FIG. 8a, the spray pipe portion 6d can be swung in the direction of the arrow X to be rotated 360 degrees. Further, as shown in FIG. 8b, the spray pipe portion 6d can be swung in the arrow Y direction to spray in an arbitrary direction in the vertical direction. Further, as shown in FIGS. 8c and 8d, the spray pipe portion 6d is in a horizontal state, and can be sprayed in any horizontal direction by swinging in the arrow Z direction. Although not shown, the spray pipe portion 6d can be swung in an inclined state, and as a result, the spray direction can be set in any direction on the front side.

  In this mounted state, the direction of the spray nozzle 5 of the aerosol can 1 and the rotation axis direction of the motor 30 and the drive cam 32 are the same direction and are parallel to each other, so that the apparatus can be thinned. And the state where the automatic spraying device 10 is mounted on the upper part of the aerosol can 1 becomes a cylindrical shape with the same outer diameter as shown in FIG. 4, the installation space is not increased, and is the same as the installation space of the aerosol can 1, Can be installed in a small space. When removing the automatic spraying device 10 from the aerosol can 1, holding the aerosol can 1 with one hand and holding the upper automatic spraying device 10 with the other hand and slightly twisting, the mounting claw 26 can be stepped portion 3 a of the crimping ring portion 3. It is possible to remove the automatic spraying device 10 easily. When the battery 17 is accommodated in the battery holder 13, the outer case part 40 can be easily removed from the mechanism part 20.

  When the automatic spray device 10 mounted on the upper portion of the aerosol can 1 is operated in this way, when the power switch 14 is turned on, the motor 30 is rotated, and this rotation is decelerated via the speed reduction wheel train 31 and the drive cam 32. Rotate. The drive cam 32 is set to stop when it makes one rotation, and one spray operation of the aerosol can is executed by this one rotation operation. That is, when the drive cam 32 rotates, the low-level cam surface 32b facing the operating protrusion 7 of the spray jig 6 above the spray nozzle 5 rotates and the operating protrusion 7 and the rising inclined cam surface 33b are moved. The operating protrusion 7 is gradually pressed in contact. Since the inclined cam surface 33b has a gentle gradient, the torque of the motor 30 is small, and a spraying operation is possible even with a small motor.

  When the spray nozzle 5 is pushed by a predetermined amount, the liquid inside is pushed by the high-pressure gas inside and sprayed, and sprayed from the spray pipe portion 6 d at the tip of the spray jig 6. Spraying continues while the operating projection 7 and the high-level cam surface 33a of the drive cam 32 are in contact with each other, and spraying stops when the operating projection 7 starts to descend the descending inclined cam surface 33c and passes a predetermined level. . Since the descending inclined cam surface 33c has a steep slope, the spraying is quickly stopped. Thereafter, the drive cam 32 rotates, the low-level cam surface 32b and the operating projection 7 face each other with a gap, and the drive cam 32 stops once after rotating. As described above, the automatic spraying apparatus 10 performs one spraying operation by one rotation of the drive cam 32.

  In this way, after one rotation operation is completed, the LED 15 is turned on to indicate that the operation is continuing. When a predetermined time elapses due to the electric circuit on the substrate 12, the motor 30 is automatically rotated again, and the drive cam 32 is rotated once, and the LED 15 is turned on after performing the spraying operation. repeat. In this embodiment, the above operation is set to be repeated until the power switch 14 is turned off. However, a time for completing the entire operation may be set so that the power is automatically turned off after the completion time has elapsed. Good. The slide switch 16 for setting the spray time interval can be freely set to spray, for example, once every 5 minutes, or once every 10 minutes or 30 minutes.

  The setting of the spray time interval is not limited to the setting by the slide type switch as described above, but may be the setting by a rotary type switch, a DIP switch or the like. Moreover, although the example of the setting of spraying time was shown by the length of the high level cam surface 33a of the protrusion 33 of the drive cam 32, only the setting at the time of spraying start is performed by the drive cam with the length of the protrusion fixed. The spraying time may be set electrically. Further, a contact electrode may be formed on the drive cam, and a configuration in which a contact piece in contact with the electrode is provided so as to detect one rotation of the drive cam.

  According to the automatic spraying device 10 having the above-described configuration, it is possible to easily spray the fragrance at predetermined time intervals, for example, in a toilet or the like. It is easy to spray the repellent. The automatic spraying device 10 has substantially the same outer diameter as the aerosol can 1 and can be easily mounted on the upper portion of the aerosol can 1, so that the installation space for the automatic spraying device 10 can be minimized. Further, it can be easily removed from the aerosol can 1 and can be easily replaced when the aerosol can 1 becomes empty.

  Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention described in the claims. Design changes can be made. For example, although an example of a spur gear is shown as the reduction gear train, it may be configured to decelerate with another gear train such as a worm gear. Although an example of a direct current motor has been shown as the motor, it is needless to say that another motor such as a servo motor capable of changing the rotation speed or a stepping motor may be used.

  In addition, the drive cam that presses the spray nozzle is configured to stop when it makes one rotation, and this configuration is configured to detect one rotation in terms of an electric circuit. For example, a projection is formed on the drive cam, and this projection is It may be mechanically configured to stop after one rotation by detecting with a sensor or a micro switch. Although the example in which the mounting claw for mounting the automatic spraying device on the aerosol can is engaged with the stepped portion on the outer side of the pressure-bonding ring portion has been shown, it may be configured to be engaged and mounted from the inner side. The present invention is not limited to aerosol cans but can be applied to various spray cans, and the contents are not limited to liquids.

(A) is a principal part perspective view of an aerosol can, (b) is a principal part sectional view of (a), (c) is a principal part perspective view in the state where a spraying jig was attached. 1 shows an embodiment of an aerosol can automatic spray device according to the present invention, in which (a) is a front view, (b) is a side view, and (c) is a plan view. The principal part perspective view which shows the internal structure of the state which removed the automatic spraying apparatus of FIG. 2 from the aerosol can. The perspective view of the state which mounted | wore the aerosol can with the automatic spraying apparatus of FIG. The principal part sectional drawing which shows the internal structure of the state which mounted | wore the aerosol can with the automatic spraying apparatus of FIG. The bottom view of the state which removed the lower board which shows the reduction gear train of the automatic spraying apparatus of FIG. (A) is a front view of a drive cam, (b) is a rear view, (c) is a sectional view taken along line AA of (a), and (d) is a cam diagram. The state which changes an injection direction with a spray jig | tool is shown, (a) is a principal part front view, (b) is a principal part side view, (c) is a principal part front view of another state, (d) is (c) The principal part top view of).

Explanation of symbols

  1: Aerosol can, 3: Crimp ring part, 3a: Step part, 5: Spray nozzle, 6: Spray jig, 7: Actuation protrusion, 10: Automatic spray device, 11: Power supply part, 17: Battery, 20: Mechanism: 21: Upper plate, 22: Lower plate, 26: Mounting claw, 30: Motor, 31: Reduction wheel train, 32: Drive cam, 32b: Low level cam surface, 33: Projection, 33a: High level cam surface, 33b, 33c inclined cam surface, 40: exterior case

Claims (4)

An automatic spray device that is detachably mounted on the upper part of an aerosol can and sprays the contents contained therein by directly or indirectly pressing a spray nozzle by a projection of a drive cam rotated by a motor via a speed reduction mechanism Because
The device has a cylindrical shape having an outer diameter substantially equal to the outer diameter of the aerosol can, and is fitted to a pressure-bonding ring portion on the outer periphery of the spray nozzle of the aerosol can. Automatic spraying device for cans.   The spray nozzle includes a spray jig for changing the spray direction from the upper side to the side, the drive cam rotates in a horizontal direction, and presses the spray jig with the protrusion protruding downward. The aerosol can automatic spraying device according to claim 1.   The drive cam has a protrusion having a high-level cam surface protruding from a low-level cam surface and an inclined cam surface connecting the high-level cam surface and the low-level cam surface on a circumferential track centered on the rotation center thereof. The aerosol can automatic spraying device according to claim 2, further comprising: a portion for spraying the contents while the spray jig is in contact with the high-level cam surface.   In the rotational direction of the drive cam, the inclined cam surface that transitions from the low level cam surface to the high level cam surface has a gentle gradient, and the inclined cam surface that transitions from the high level cam surface to the low level cam surface has a steep gradient. The aerosol can automatic spraying device according to claim 3.

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