JPH0565227B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an apparatus for painting the outer peripheral surface of a thin rod-shaped object such as chopsticks with lacquer or the like.

[Conventional technology]

A device for applying lacquer or other paint to the outer circumferential surface of bamboo or wooden chopsticks, etc., which have a narrow tip and become thicker toward the base.
In JP 58791, in front of a clamping tool that clamps the root portion of a thin rod-like body from above and below, a flexible membrane with insertion holes through which each thin rod-like body held between the thin rod-like bodies can be inserted from its tip is stretched on the front surface. A paint tank is provided so as to be movable back and forth, and a knife-shaped support is provided in the vicinity of the front end of each clamping tool so as to be movable up and down. A configuration is disclosed in which the root portion of the thin rod-like body is held between the knife-like support and the holding tool in a self-centering manner so as to be swingable.

[Problem to be solved by the invention]

According to this prior art, since the root portion of the thin rod-like object is held by the knife-like support of the gripping device in a self-centering manner that allows the thin rod-like object to swing freely, the thin rod-like object is attached to a flexible membrane made of rubber or the like on the front surface of the paint tank. The tip of the thin rod-like body must be supported by the centering body until the paint tank is advanced so that the tip of the thin rod-like body is inserted. It is necessary to temporarily stop the advance of the paint tank while the centering body is lowered after being advanced to the point where it is inserted into the flexible membrane, resulting in a decrease in painting efficiency.

In addition, after the paint in the paint tank has been applied to the vicinity of the base of the thin rod-like object, when the outer peripheral surface of the thin rod-like object is handled with the flexible membrane when the paint tank is retreated, the thin rod-like object may be held by the knife-like support. Since the strength was not sufficient, there was a problem in that the thin rod-like body of the flexible membrane was pulled out from the clamping tool.

The present invention solves the above two problems at once.

[Means to solve the problem]

In order to achieve this purpose, in the present invention, the base portions of thin rod-like bodies such as chopstick material are inserted into and clamped by clamping tools arranged at appropriate intervals in the horizontal and lateral direction, and the tip of each thin rod-like body is held. A paint tank filled with paint is provided in the front so as to be movable back and forth, and a flexible membrane with insertion holes into which each of the thin rod-shaped bodies held between the thin rods can be inserted is stretched on the front surface of the paint tank. A centering body is provided below near the tip of the thin rod-like body to be movable up and down to support each tip and set the center position of the paint tank with respect to the flexible membrane, At the front position near the tip of the thin rod-shaped body,
A pressing body for pressing the upper surface of the base of each thin rod-like body is provided so as to be able to rise and fall freely, while a longitudinal lifting body is attached to the pressing actuator below the clamping tool and extends along the arrangement direction of the thin rod-like bodies. Each of the knife-shaped supports is configured so that the lower surface of the base of each thin rod-shaped body is pushed up and bitten into a guide pin that is provided and protrudes upwardly from the elevating body at each of the clamping tool locations, Each thin rod-shaped body is slidably fitted via a biasing spring and supported by the centering body and the clamping member by the upward movement of each of the knife-shaped supports and the downward movement of each of the pressing bodies. The centering member is configured to maintain its posture, and when the centering member is lowered, a regulating means is activated to prevent the lowering movement of each of the knife-shaped supports.

[Operation and effect of the invention]

According to this configuration, in order to insert the tip of the thin rod-like body into the flexible membrane on the front surface of the paint tank, the base of the thin rod-like body is positioned near the tip of the thin rod-like body with the centering body. In addition to the clamping tool, the part is pressed by a pressing body from above, and a knife-shaped support from below is bitten into the lower surface of the base and supported, and in this state, the raised position of the knife-shaped support is controlled by a regulating means. After that, even without the centering body, the thin rod-like body can be maintained in a posture such that the tip of the thin rod-like body can be inserted into the flexible membrane on the front surface of the paint tank.

Therefore, the centering body is lowered so that the tip side of each thin rod-like body is free, and the paint tank is opened so that the thin rod-like bodies held in the posture as described above are coated from the tip to the base at once. Unlike the prior art described above, there is no need to stop the paint tank midway during its forward movement, and the coating efficiency can be greatly improved.

In addition, as mentioned above, the base of the thin rod is pushed up from below by the knife-like support and the root of the thin rod can be firmly held by the upper pressing body, so the paint tank When handling the thin rod-like body with the flexible membrane when the thin rod-like body is retreated, there will be no accident in which the root portion of the thin rod-like body is pulled out from the clamping tool and falls off.

Further, a long elevating body is attached to the pressing actuator and extends in the direction in which the thin rod-like bodies are arranged, and a knife-like support is attached to guide pins that protrude upward from the elevating body at each of the clamping tool locations. Since each thin rod is slidably fitted via a biasing spring, even if the thickness and clamping height of the root of each thin rod is different, the bottom surface of the root of all the thin rods is different. It is possible to press the thin rod-like bodies firmly into the rod-shaped body in a pushed-up state, and it is extremely easy to keep the posture of all the thin rod-like bodies constant, which has the remarkable effect of improving work efficiency during mass production.

〔Example〕

Next, to explain an embodiment, FIG. 1 is a plan view of the entire coating plant 1, in which a large number of vertically long panels 2 are installed so as to be able to move intermittently horizontally in an endless manner via a transfer means 3 such as a transfer chain. , a coating device 4 of the present invention is installed at one end of the coating plant 1.

FIG. 2 is a front view of the panel 2.
An endless conveyor chain 5 is wound around a large number of chain sprockets provided in front of the conveyor chain 5, and the conveyor chain 5 is configured to be moved intermittently by a drive motor 6. A clamping tool 7, which will be described in detail later, is attached forward at intervals.

Reference numeral 8 denotes a supply device that inserts the base of a thin rod-shaped body 9, which is a chopstick material, into each clamping tool 7 above the coating device 4, and reference numeral 10 extracts the thin rod-shaped body 9 from the clamping tool 7 after painting and drying. Each discharge device is shown.

The paint tank 11 in the coating device 4 has a pair of left and right parts arranged so that its base end faces forward and downward at an inclination angle (θ) to the horizontal fixed table 12 of the machine frame. It is slidably supported by round bar-shaped guide rails 13, 13, and configured to move back and forth using a pneumatic cylinder 14.

Reference numeral 15 denotes a knife-shaped support that is movable up and down in the vicinity of the holding tool 7 on the front side of the conveyance chain 5, which moves laterally near the lower end of the panel 2, and located below the front thereof. A pressing body that moves up and down in an undulating manner above the support body 15, reference numeral 17
is a centering body provided at a position closer to the paint tank 11 than the knife-shaped support 15 so as to be movable up and down.

The conveyance chain 5 can be inserted into a pair of upper and lower support guide rails 19, 19 which protrude forward between left and right chain sprockets 18, 18 at the lower front surface of the panel 2.

The clamping tool 7 attached to the front end of the conveyance chain 5 is fixed to an upwardly open supporting metal fitting 20 having a substantially V-shaped cross section and the upper surface of the proximal end of the supporting metal fitting 20, and has its front end bent into a downwardly convex curved shape. Pressing spring 2 as the clamping part 21a
1 (see FIGS. 6 to 8), and the lower surface of the support fitting 20 is supported by a guide rail 23 so as to be able to freely slide approximately horizontally.

In the embodiment, 20 clamping tools 7 are arranged horizontally on the guide rail 23 at a constant pitch (P) (in the embodiment, 25.4 lined up in mm intervals).

The pressing body 16 has a downward L-shaped cross section with a blade portion 16a facing downward at the tip, and the blade portion 16a of each pressing body 16 is located at the base of each thin rod-like body 9 held by the clamping tool 7. Each pressing body 16 can bite into the upper surface of the root portion slightly forward of the front end.
The base end of the panel 2 is attached at the fixed pitch (P) to the horizontally long rotating shaft 24 installed horizontally on the front surface of the panel 2, and rotated by an appropriate angle using a link mechanism (not shown), so that all the pressing bodies 16 are moved up and down at the same time relative to the base of the thin rod-like body 9.

Each knife-shaped support 15 is secured with a screw 26 so as to appropriately protrude upward from an upwardly facing end of a base body 25 that is L-shaped in side view, and each base body 25 faces upward through a through hole in the fixed table 12 .

Reference numeral 27 denotes each base 25 at the constant pitch (P).
The elevating body 27 is a horizontally elongated elevating body supported vertically movably by a piston rod 28 of a pressing actuator 28 such as a pneumatic cylinder attached to the lower end of a frame 29 disposed below the fixed table 12.
Each of the base bodies 25 is vertically slidably fitted into a main guide pin 30 which is driven up and down via a connecting pin 36 and projected upward from the elevating body 27, and an urging spring is loosely fitted into the main guide pin 30. At 31, the base body 25
It is biased upward every time.

Next, a description will be given of a regulating means for regulating the downward movement of each of the knife-shaped supports 15 and, in turn, the base body 25 at the raised position. A bush 34 that guides each of the main guide pins 30 in a vertically slidable manner is embedded in the horizontally long upper support 32 that is fixed by a pair of left and right columns 33 in the frame 29. On the back side, a sub guide pin 3 is provided that projects upward from each base 25 in parallel with the main guide pin 30.
A guide groove 37 for guiding the front circumferential surface of 5 is recessed.

A plurality of fixing actuators 38 such as pneumatic cylinders are disposed forward on the back side of the upper support 32 and are attached to the plate 41 via connecting brackets 39 and 40 to the frame 29 and/or the upper support 32. , a horizontally long stopper piece 44 is proudly attached to the tip of a plurality of guide pins 43 that slidably project from a horizontally long bracket 42 that is pin-connected via a piston rod 38a that projects forwardly of each fixing actuator 38. The guide pin 35 is arranged so as to be in contact with the back surface of the sub guide pin 35 . As a result, when the fixing actuator 38 is actuated, the stopper piece 44 presses the main guide pin 30 via the sub-guide pin 35 that is integral with each base 25, and each base 25 is lowered relative to the main guide pin 30. movement will be regulated.

Reference numeral 45 denotes a coil spring that loosely fits into each guide pin 43 and biases the stopper piece 44 in the projecting direction.

Reference numerals 46 and 47 indicate that paint such as lacquer leaking from the front of the paint tank 11 may accumulate on the sliding parts of the main guide pin 30, actuators 28, 38, etc. via the knife-shaped support 15, base 25, etc. This is a protective cover that prevents it from solidifying after being splashed.

The centering body 17 supports the tip end of the thin rod-like body 9 held by each of the holding tools 7 from the bottom surface, and as shown in FIG. On the upper end surface, there is a sawtooth notch groove 4 for supporting the thin rod-like body 9 at each tip end location.
8, the centering body 17 is attached to a lifting table 51 via a support plate 49 and a pair of right and left support rods 50, and is raised and lowered by a suitable height dimension by a positioning actuator 52 such as an air cylinder. The above-mentioned pressing actuator 28, frame body 29, etc. are attached to the upper surface of the lifting platform 51, so that when the panel 2 moves laterally, the tips of the knife-shaped support 15 and centering body 17 do not collide with the panel 2. It is driven up and down by the air cylinder 54 so that it sinks down below the fixed table 12 as a whole.

Further, the maximum raised position of the centering body 17 is defined by the axis of the thin rod-like body 9 whose base portion is held between the clamping tools 7 and the flexible membrane 5 stretched over the front surface of the paint tank 11, etc.
The center lines of the insertion holes 55a and 56b of 5 and 56 are set (fixed) so that they coincide with a trajectory G drawn as the paint tank 11 moves back and forth (in the embodiment, this trajectory G is (at an inclination angle (θ) with respect to the fixed table 12 which is horizontal in view).

The order of raising and lowering the centering body 17, the knife-shaped support 15, etc. is as follows.

That is, the paint tank 11 is moved back greatly and held in position, and the thin rod-shaped body 9 before painting is transferred to the support guide rails 19, 19 with the base portion being held by the clamping tool 7 attached to the conveyance chain 5. It will be done.

Next, the centering body 17 rises, places the tip of each thin rod-like body 9 on the notch groove 48, and stops at a location where the axis of the thin rod-like body 9 coincides with the trajectory G.

After that, the pressing body 16 rotates the rotation shaft 24 to which the pressing body 16 is attached, and the pressing body 16 is attached to the upper surface of the root portion of the thin rod-shaped body 9.
Press so that the blade part 16a bites into it. When the pressing actuator 28 is actuated approximately at the same time or with a slight delay from the downward rotation of the pressing body,
A large number of main guide pins 30 are raised all at once via the elevating body 27, and the base body 25 fitted onto each main guide pin 30 is raised via the urging spring 31, and a knife-shaped support is provided at the upper end of each base body 25. The upper end blade portion of the body 15 bites into the lower surface of the root of the thin rod-like body 9.

At this time, the manufacturing error of each thin rod-shaped body 9 and the clamping tool 7
Even if the degree of elevation of the knife-shaped support 15 differs due to an error in mounting the knife, the error is absorbed by the biasing spring 31.

With the knife-shaped support 15 raised in this way, the fixing actuator 38 in the regulating means
is activated to project the piston rod 38a forward and press the back surface of the sub guide pin 35 toward the upper support 32 via the bracket 42, connecting pin 43, coil spring 45, and horizontally long stopper piece 44. The base body 25 and the knife-shaped support 15 are fixed in the raised position, and even if the centering body 17 is lowered thereafter, the gripping tool 7, the pressing body 16, and the knife-shaped support 15 are used to hold the base. The posture of the thin rod-like body 9 with its supported portions is such that its axis can remain aligned with the trajectory G.

Note that the knife-like support 15 is not perpendicular to the lower surface of the slanted thin rod-like body 9, but is cut into the thin rod-like body 9 so as to press the root portion of the thin rod-like body 9 toward the proximal end of the clamping tool 7. The main guide pin 3 is moved so that the knife-shaped support 15 rises obliquely upward toward the front end of the clamping tool 7 from a position close to the front of the lower surface of the rod-shaped body.
It is preferable to incline the axis of 0 and, in turn, the vertical axis of the pressing actuator 28, so that when the paint tank 11 retreats, the thin rod-shaped body 9 is dragged by the elastic force of the flexible membrane 55 and the like and comes out of the clamping tool 7. can be reliably prevented.

As described above, when the paint tank 11 is moved forward as shown by the two-dot chain line in FIG. 6 while the thin rod-like body 9 is held in an attitude such that its tip side faces upward, the front surface of the paint tank 11 is Since the center line of the insertion holes 55a, 56a of the flexible membranes 55, 56 stretched over the paint tank 11 coincides with the axis line of each of the thin rod-shaped bodies 9, The tip of the thin rod-like body 9 can be inserted extremely smoothly into the insertion hole 55a of the flexible membrane 55, and by dipping the outer periphery of the thin rod-like body 9 into the paint 57 such as lacquer in the paint tank 11, it can be painted all at once. When the paint tank 11 is retracted, the elasticity of the flexible membrane 55 itself has the effect of handling the outer circumference of the thin rod-shaped body 9, so excess paint adhering to the outer circumference is wiped off and the coating thickness is spread over the entire circumference. It becomes easy to make the coating uniform.

When the painting process is completed as described above, the pressing body 1
6 and the pressing actuator 28
Then, the fixing actuator 38 is operated to lower the knife-shaped support 15 to release the posture of the thin rod-shaped body, and then the conveyance chain 5 is moved.
The next unpainted thin rod-shaped body 9 is the guide rail 19,1
All you have to do is make sure it comes to 9 places.

By extending the flexible membrane 56 to the partition wall 58 provided in the paint tank 11, it is possible to supply only a small amount of the paint 57 to the space between the front plate 59 of the paint tank 11 and the partition wall 58. It's over.

Further, the paint 57 is inserted through the insertion hole 55a of the flexible membrane 55.
In order to prevent the inside of the paint tank 11 from leaking out, the inside of the paint tank 11 is connected to a vacuum pump (not shown) through a hose 60, and the inside of the paint tank 11 is maintained at a negative pressure.

The knife-shaped support 15 has a thin rod-shaped body 9 at its upper end.
The position where it bites into the bottom surface of the root is the upper pressing body 1.
The position where the blade part 16a of No. 6 bites into the upper surface is different by the dimension (a) as shown in FIG. If configured so that it is spaced forward from the front end of the clamping tool 5, the end surface of the root portion of the thin rod-shaped body 9 will make point contact with the upper surface of the support fitting 20 in the clamping tool 7 at two points A1 and A2 on the left and right, and The upper surface of the part is connected to point B1 of the clamping part 21a of the pressure spring 21,
Since the blade portion 16a of the pressing body 16 makes point contact at two points, point B2, and further makes point contact at point C of the upper end blade portion of the knife-shaped support 15, the knife-shaped support and the pressing body are held together. It can be held in a so-called self-centering manner by the tools.

Therefore, when handling with a flexible membrane, it is necessary to make the pressure contact force of the insertion hole of the flexible membrane uniform over the entire circumference with respect to the outer periphery of the thin rod-shaped body, and to eliminate unevenness in the thickness of the applied paint. This can be done more reliably.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Figure 1 is a plan view of a painting plant, Figure 2 is a front view of a panel, and Figure 3 is a front view of a panel.
The figure is a plan view showing the paint tank in the forward state, FIG. 4 is a side view from the side view shown in FIG. 3, FIG.
FIG. 7 is an enlarged plan view of the holding tool, FIG. 8 is a sectional view of FIG. 7, FIG. 9 is a front view of FIG. 6, and FIG. The drawings are a partially cutaway sectional view taken along the line XI-XI in FIG. 6, and FIG. 11 is a partially cutaway plan view taken along the line XI-XI in FIG. DESCRIPTION OF SYMBOLS 1... Painting plant, 2... Panel, 4... Painting device, 5... Conveyance chain, 7... Gripping tool, 20
...Supporting metal fitting, 21 ... Pressure spring, 9 ... Thin rod-shaped body, 11 ... Paint tank, 55, 56 ... Flexible membrane, 55a, 56a ... Insertion hole, 12 ... Fixed table, 13, 23 ...Guide rail, 14...
Pneumatic cylinder, 15... knife-shaped support, 25
... Base body, 16 ... Pressing body, 17 ... Centering body,
19...Support guide rail, 24...Rotation axis, 2
7... Lifting body, 28... Pressing actuator,
29...Frame body, 30...Main guide pin, 31...
Biasing spring, 35... Sub-guide pin, 37... Guide groove, 44... Stopper piece, 38... Fixing actuator, 45... Coil spring, 52... Positioning actuator, 54... Air cylinder.

Claims (1)

[Claims] 1 Insert and hold the bases of thin rod-like bodies such as chopstick material into clamping tools arranged at appropriate intervals in the horizontal and lateral direction, and paint is put inside the front of the tip of each thin rod-like body. A paint tank is provided so as to be movable back and forth, and a flexible membrane is provided on the front surface of the paint tank with an insertion hole into which each of the sandwiched thin rod-like bodies can be inserted from its tip. is provided with a vertically movable centering body that supports each tip and sets the center position of the paint tank with respect to the flexible membrane, and the tip of the thin rod-shaped body is located near each of the clamping tools. A pressing body for pressing the top surface of the base of each thin rod-like body is provided at the near front position so as to be movable up and down, while a pressing actuator is attached to a pressing actuator below the clamping tool to move the thin rod-like bodies in the arrangement direction. A knife configured such that a longitudinal elevating body is provided along the elevating body, and the lower surface of the root of each of the thin rod-shaped bodies is pushed up and bitten into guide pins that are provided upwardly protruding from the elevating body at each of the clamping tool locations. Each of the knife-shaped supports is slidably fitted via a biasing spring, and supported by the centering body and the clamping tool by the upward movement of each of the knife-shaped supports and the downward movement of each of the pressing bodies. The centering member is configured to maintain the posture of each of the thin rod-like bodies, and when the centering body is lowered, the restricting means is activated to prevent the lowering movement of each of the knife-shaped supports. A coating device for thin rod-shaped objects such as chopsticks.