JPH0764050B2 - Printing machine powder-spraying device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder spraying device for a printing press.

[0002]

2. Description of the Related Art Conventionally, as a powder spraying device for a printing machine, a powder is sent from its supply chamber into a storage chamber, and air is jetted into the storage chamber of the powder to raise the powder in the storage chamber. It is known that powder is sucked up by jet air and sent to a spraying position.

[0003]

In the above-mentioned conventional powder spraying device, since the powder is rapidly sent from the supply chamber to the accommodating chamber in a lump, the powder is sprayed on the printing surface. A large amount of ink is retained, resulting in deterioration of print quality, print failure when printing again, deterioration of working environment, and machine failure.

According to the present invention, the powder is supplied from the supply chamber to the storage chamber in a small amount so as to keep the powder spraying to the minimum necessary amount, thereby maintaining the good print quality. It is an object of the present invention to provide a powder spraying device in which reprinting is smoothly performed, a working environment is improved, and a machine is sufficiently protected.

[0005]

In order to achieve the above object, the present invention incorporates a powder drop adjusting rod into a powder drop pipe connecting a powder supply chamber and a storage chamber, and the powder is dropped onto this adjusting rod. A guide hole and a lateral discharge hole communicating with the guide hole are formed in the vertical shaft that optimally limits the amount, and a window communicating with the lateral discharge hole and the storage chamber is formed in the powder drop pipe. There is.

[0006]

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 shows a paper discharge section of a printing machine, in which a printed paper (1) is sent to a chain gear (3) by a chain (2),
Stacked on a support (4) below the chain wheel.

Dispersing nozzles (5) for powder are arranged at the obliquely rising portions of the chain (2). When the printing paper (1) passes through the nozzle (5), a powder (6) for set-off prevention is sprayed by the nozzle (5). An air outlet (7) is provided above the nozzle (5), and an air cart (8) is formed at this outlet to prevent the powder from scattering.

As a means for synchronizing the spraying operation of the powder with the passage of the printing paper (1) through the nozzle (5), the cam (9) is common to the chain gear so that it rotates integrally with the chain gear (3). Of the swinging arm fixed to the shaft (10) of the
A diaphragm (11) is connected to the valve (12). When the arc portion (13) of the cam (9) is in contact with the arm (11), the valve is opened and the powder is sprayed, and the recessed portion (14) of the cam is opened.
When it is in contact with (11), the valve is closed and the spraying of powder is stopped.

FIG. 2 schematically shows a powder spraying device.
When the blower (15) blows air into the main body (17) through the pipe (16), the powder supplied from the powder supply container (18) is passed through the pipes (19) to the respective powders. -Carry it to the spray nozzle (5) and spray. The valve (12) is provided in the middle of the pipe (16), and the opening and closing of the valve is controlled by the cam (9). The air sent from the blower (15) is intermittently sent to the main body (17) according to the opening and closing of the valve (12), and the powder is sprayed intermittently. The pipe (20) sends air from the blower (15) to the air outlet (7) and is used to form an air-curtain (8). The adjusting knob (21) is used to increase or decrease the flow rate of a part of the air passing through the main body (17) to adjust the spraying amount of the powder. The other adjusting knob (22) is used to adjust the flow rate of the mixed fluid of air and powder sent to the nozzle (5) through each pipe (19), and the rotation of this knob , Powder
It is possible to adjust the spraying amount of each nozzle, or evenly adjust the spraying amount of each nozzle.

3 and 4 more specifically show the powder spraying device, in which the powder supply container (18) is a valve box (23).
The valve box is connected to the main body (24), and the main body is connected to the powder container (25). The body (24) is a rectangular parallelepiped that is almost square when viewed from above, and has a fitting for air feeding on its right side.
(26) is connected, a cylindrical mixer (28) is connected to the left side through a joint (27) that sends out a mixed fluid of air and powder, and a cylindrical distributor (29) is connected to the mixer. Are combined.
The knob (22) for adjusting the flow rate of the mixed fluid to be distributed is provided on the front surface of the distributor (29), and the joint (30) for guiding the mixed fluid to be distributed to the pipe (19) is provided on the rear surface. Has been. On the front surface of the main body (24), the knob (21) for adjusting the amount of air that blows up the powder flowing into the powder container (25) is attached.

The powder is filled in the supply chamber of the supply container (18) from its upper end opening surface, and the opening surface is closed by the lid (31).

The powder in the supply container (18) is intermittently replenished in the accommodating chamber of the powder container (25) according to the opening and closing of a valve element (described later) in the valve box (23).

The opening and closing of the valve is driven by a solenoid (34) and a tension coil spring (35) via an arm (32) and a lever (33), and the drive command to the solenoid is the powder container (25). The light sensors of the light emitter (36) and the light receiver (37) provided on both sides of ().

The air sent from the joint (26) into the main body (24) sucks the powder in the powder container (25) and mixes it.
Send to (28). The powder is uniformly mixed with air in the mixer (28) and sent to the distributor (29). Powder
The mixed fluid of air and air is sent from the distributor (29) to the pipe (19) at the joint (30). Powder sent from the main body (24)
The total amount of powder is adjusted by the knob (21) and distributed.
The amount of is adjusted with knob (22).

The supply container (18) is a transparent cylindrical main body (38).
And a funnel-shaped bottom (39) fixed to the lower end of the valve, the cylindrical neck (40) at the lower end of the bottom is fitted into the small-diameter cylindrical part (41) of the valve box (23) and screwed. It is fixed at (42). The filling amount of the powder in the supply container (18) can be visually checked from outside the main body (38).

The valve box (23) is composed of the small-diameter cylindrical portion (41) and a large-diameter cylindrical portion (43) integrally connected to the cylindrical portion (41).
A vertical hole (44) for powder feeding is formed in (41) and (43), and a horizontal hole (45) communicating with this hole (44) is formed in the cylindrical portion (43). .

A valve element (46) is provided at the upper end of the tubular portion (41), and a rubber valve seat (47) which comes into contact with the valve element is installed in an annular groove at the upper end of the tubular portion (41). ing.

The valve body (46) is the valve rod (48) in the hole (44) of the valve box (23).
The neck (49) of the valve rod (48) is engaged with the fork (50) of the lever (33) in the lateral hole (45). The lever (33) is supported by the fulcrum (52) of the lever receiver (51) and swings around the fulcrum to move the valve body (46) up and down to move the valve body (46).
The flow path between (46) and the valve seat (47) is opened and closed. Leverage (5
1) has a flange (53), and this flange (53) is
It is fixed to 3) and the opening surface of the lateral hole (45) is closed. The lever (33) is further fixed to the arm (32).
(32) is connected to the operating rod (54) of the solenoid (34) by a pin (55), and the operating rod (54) is constantly subjected to upward pulling force by a tension coil spring (35). When the operating rod (54) is lowered by the magnetic force, the valve body (46) separates from the valve seat (47), and when the magnetic force disappears and is raised by the spring force, the valve body (46) moves the valve seat (47). ).

The main body (24) is formed in the shape of a substantially rectangular parallelepiped having side surfaces parallel to each other, and has a cylindrical channel space (56) at its center and a central hole concentric with the space and continuous with the space.
(57) is formed, and the holes (58), (5) of the flow path having a circular cross section and communicating with the space (56) in the lateral direction orthogonal to the center of the space (56) are formed.
9) has been formed. In addition, the hole (6
0) is formed so as to penetrate the hole (58) at a right angle.

A fitting (26) for the pipe (16) is fixed to the hole (58) with a screw (61), and a fitting (62) for the mixer (28) is fitted with a screw (63) in the hole (59). The nozzle (64) for injection is fixed by screws (65) over the hole (59) and the hole of the joint (62). The outer circumference of the nozzle (64) and the hole (59) in the body and the hole (6
An annular space (67) is formed between 6). Air fittings
When fed into the (26), air is accelerated from the flow path of the hole (58) through the flow path of the central space (56) in the flow path of the nozzle (64) to the hole (66) of the joint (62). The air in the annular space (67) is injected into the flow path and is sucked into the hole (66) of the joint (62). This suction force sucks the powder as described later and sends it to the next mixer (28). The joint (62) is connected to the joint (27) with a screw (68).

The powder container (25) has a transparent cylindrical shape and is provided on the lower surface of the main body (24), and the opening surface at the lower end of the container (25) is closed by a lid (69). This powder container (25)
The powder accommodating chamber of the main body (24) has a vent hole (70) to form an annular space.
It communicates with (67) and sucks out the powder in the container (25) into this annular space.

The cylindrical powder drop pipe (71) for guiding the powder from the valve box (23) into the container (25) has a hole (57) at the center of the main body (24).
And the central space (56) and the space of the container (25) and the central hole (72) of the bottom lid (69). The powder dropping pipe (71) has its upper end fixed to the hole (44) of the valve box (23) with a screw (73), and the tightening nut (74) attached to the outer periphery of the lower end with a screw (75). The bottom lid (69) is fixed to the container (25) with the nut (74). The powder drop pipe (71) is further provided with a pair of rectangular windows (78) arranged in the peripheral wall so as to be opposed to each other on the diametric line near the lower end between both ends.
Have. This window (78) has a powder inside the powder drop pipe (71).
The powder in the powder drop pipe (71) is communicated with the container (25) and sent out into the container (25).

A powder drop adjusting rod is provided on the inner circumference of the powder drop tube (71).
(110) is fixed with screws (111). This adjusting rod (11
(0) is also cylindrical and is formed to have a size in close contact with the inner peripheral surface of the powder drop pipe (71), and has a small-diameter powder guide hole (112) bored in the longitudinal direction at the center thereof and the guide hole (112). ) Has a large diameter powder discharge hole (113) which communicates with the lower end of the adjustment rod (110) in the lateral direction of the diameter of the adjustment rod (110), and the opening surface of this discharge hole is the adjustment rod (110).
Are opened in the plane portions (114) cut in parallel with each other and face the window (78) of the powder drop pipe (71).

From the upper opening surface of the powder drop pipe (71), the adjusting rod (11
The space (115) of the large-diameter hole portion up to the upper end surface of 0) is used for temporarily storing the powder sent from the supply container (18). The powder is supplied to the space (115) intermittently by opening and closing the valve body (46) and the valve seat (47). The powder in the space (115) is guided by the guide hole (112) to the discharge hole (113) so that the amount of fall is limited, and the powder (P) of the powder drop pipe (71) is opened through the window (78). Via container (2
Sent to 5).

A vertical small-diameter hole (1
12) Even if a part of the upper part is formed into a large diameter hole (116) (Fig. 10) and it is used as a space for temporarily storing powder together with the space (115) of the powder drop pipe (71). Well that hole
Only the space of (116) expands the whole space for powder storage.

Supply of powder from the container (18) to the container (25) is carried out by dropping the powder from the valve box (23) as described above.
After storing once by opening the valve (46) in the space up to 1),
With the supply from the container (18) blocked by closing the valve body (46), the powder is dispensed through the window (78). Valve box (2
When the powder in the space within the powder drop pipe (71) and 3) approaches the air, the valve body (46) automatically opens and is supplied again into the space. The command to open the valve is to send light (3
6) and the optical sensor of the light receiver (37) detect the level (79) of the powder, and when it falls below that level, it is electrically transmitted to the solenoid (34). When the powder reaches the level (82) of the optical sensors of the light projector (80) and the light receiver (81), it indicates that the powder in the container (18) is empty and warns.

Air is blown into the container (25) and the powder is discharged.
Soaring the powder will make the powder suction even smoother. Further, when the amount of air supplied is adjusted, the amount of powder sucked in is adjusted. The configuration will be described below.

The fixed shaft (83) and the rotatable air flow adjusting shaft (8
4) are fitted at their abutting portions so that they are aligned on the same axis (FIGS. 6 and 8). These shafts (83) and (84) are formed with cylindrical holes (87) and (88) in the axial direction for ventilation for a predetermined length from the abutting ends. Axis (8
In 3), a circular hole (89) communicating with the hole (87) is formed in the peripheral wall (Fig. 6), and the shaft (84) also has a circumferential adjustment groove communicating with the hole (88).
(90) is formed on the peripheral wall (Fig. 8). Air is sent from the hole (89) of the fixed shaft (83) into the hole (87), from this hole (87) to the hole (88) of the adjacent shaft (84), and out of the groove (90). . The adjustment groove 90 is formed such that its width gradually expands or continuously expands in the circumferential direction of the adjustment shaft 84.

The fixed shaft (83) is inserted into the latter half of the common bearing hole (66) of the main body (24) and fixed with the screw (91), and the adjusting shaft (84) is rotatably inserted into the first half. (Figs. 6 and 8). The tip end surface of the adjusting shaft (84) is further pressed by the mounting seat (93) of the scale plate (92) and is held in the bearing hole (66).

The adjusting knob (21) is fixed to the thin shaft portion (94) of the adjusting shaft (84), and the adjusting shaft is adjusted in the range from 0 scale to 10 scale of the scale plate (92). It can be rotated.
The scale plate (92) is fixed to the mounting seat (93), and a finger line (95) for adjusting the scale of the scale plate is attached to the adjusting knob (21).

The air intake hole (89) of the fixed shaft (83) is provided in the main body.
Looking into the channel (58) of (24), it faces the joint (26) so as to face the flow of air (FIGS. 5 and 6).

The adjusting groove (90) for air discharge of the adjusting shaft (84) is formed on the inner peripheral surface of the bearing hole (66) of the main body (24) so as not to directly communicate with the flow path (58) of the main body (24). The position surrounded by the contact state is taken (Fig. 6). Circular vent (9) communicating with this adjustment groove (90)
6) extends vertically downward from the bottom of the inner peripheral surface of the bearing hole (66) of the main body (24) and opens at the bottom surface of the main body (24) (FIG. 7).

When the adjusting shaft (84) is rotated by the knob (21),
The vent hole (96) can move relative to the adjustment groove (90) between a position where the scale 0 does not communicate at all and a position where the scale 10 communicates with the maximum area. According to the movement, the communication area is increased or decreased, and the amount of air discharged from the ventilation hole (96) is increased or decreased.

The disc-shaped dish (98) has its center hole (99) shattered and fitted into the pipe (71), and the nut screw-fitted into this pipe.
It is fixed to the bottom of the body (24) with (100). This dish (98)
The central part closes the opening surface of the space (56) in the center of the main body (24) and prevents air from flowing into the container (25) through the opening surface. Further, the dish (98) has an annular groove (101) concentric with the disc formed on the upper surface thereof, and the opening surface of the groove (101) is in close contact with the bottom surface of the main body (24) to form an annular space having a tunnel cross section. To form. The annular groove (101) is arranged at a position communicating with the ventilation hole (96), and four ventilation holes (102) communicating from the annular groove (101) into the container (25) are provided at the bottom of the groove (101). It is provided at intervals. The air sent from the ventilation hole (96) into the annular groove (101) is ejected from the ventilation hole (102) into the container (25) and soars the powder in the container. The powder soared from the circular gap (103) between the outer periphery of the dish (98) and the inner peripheral surface of the container to the ventilation hole (7
0), is sucked by the jet flow of the nozzle (64), and is sent out from the joint (62). The ventilation hole (102) is an annular groove (10
If it is formed in the oblique hole facing 1) in the circumferential direction, a whirlpool air flow will be generated and the powder will be raised more smoothly.

[0036]

Industrial Applicability According to the present invention, a powder drop adjusting rod (110) is incorporated in a powder drop pipe (71) connecting a powder supply chamber and a storage chamber, and the powder drop amount is optimized to this adjusting rod. A guide hole (112) and a lateral discharge hole (113) communicating with the guide hole are formed in the limiting vertical shaft, and the lateral discharge hole (11
Since the window (78) communicating with 3) and the storage chamber is formed in the powder drop pipe (71), the powder is supplied from the supply chamber to the storage chamber in a small amount, and the powder is sprayed. To the minimum necessary amount, which ensures good print quality,
Overprinting is smooth, the working environment is improved, and the machine is well protected.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a paper discharge unit of a printing machine.

FIG. 2 is a schematic front view of the powder-spraying device of the present invention.

FIG. 3 is a front view of the powder-spraying device of the present invention.

FIG. 4 is a plan view of the powder-spraying device of the present invention.

5 is a sectional view taken along line VV of FIG.

6 is a sectional view taken along line VI-VI of FIG.

7 is a sectional view taken along line VII-VII in FIG.

8 is a sectional view taken along the line VIII-VIII in FIG.

FIG. 9 (A) is a perspective view of the powder dropping tube of the present invention.
(B) is a perspective view of the powder drop adjusting rod of the present invention.

FIG. 10 is a cross-sectional view of a modified example of the powder drop adjusting rod of the present invention.

[Explanation of symbols]

1 Printing Paper 2 Chain 3 Chain Gear 5 Powder Dispersing Nozzle 6 Powder 7 Air Outlet 8 Air Carter 9 Cam 12 Valve 15 Blower 16 Air Pipe 17 Main Body 18 Powder Supply Container 19 Powder and Pipes for feeding mixed fluids of air 20
Air supply pipe 21 Adjusting knob 22 Adjusting knob
23 Valve box 24 Main body 25 Powder container 28 Mixer 29 Distributor 34 Solenoid 35
Tension coil spring 46 Valve body 47 Valve seat 48 Valve rod 56 Flow path space
58 Channel hole 59 Channel hole 60 hole 64 Nozzle 70 Vent hole
71 Powder drop pipe 78 Window 83 Fixed shaft 84 Adjustment shaft 87 Hole 88 hole 89 Hole 90 Adjustment groove 92
Scale plate 98 Plate 101 Annular groove 102 Vent hole 110 Powder drop adjusting rod 112 Guide hole 113 Discharge hole

Claims (4)

[Claims] 1. A powder supply chamber, a powder accommodating chamber, a powder drop pipe for guiding the powder from the supply chamber to the accommodating chamber in a free-falling manner, and air for feeding the powder into the accommodating chamber. It has a flow path and a flow path that sucks up the powder that has risen in the storage chamber with a jet stream and sends it toward the spraying means, and valve means is provided between the supply chamber and the powder drop pipe. The powder is intermittently replenished in the drop pipe, and the powder drop adjusting rod is incorporated in the powder drop pipe.
The vertical guide hole provided in the adjusting rod optimally limits the amount of powder falling, and the powder is dropped from the lateral discharge hole communicating with the guide hole through the window of the powder drop pipe into the accommodating chamber. The powder-spraying device of the printing machine sent to. 2. The powder dropping pipe is formed in a cylindrical shape, and a pair of windows of the powder dropping pipe are provided in a peripheral wall of the powder dropping pipe so as to face each other in a substantially rectangular shape. 2. The powder of a printing press according to claim 1, wherein the discharge holes of the adjusting rod are closely fitted in the drop pipe, and the discharge holes of the adjusting rod are perforated in the flat portions cut in parallel to communicate with the window of the powder drop pipe. -Spraying device 3. The powder drop pipe is connected at its upper end to a valve box of valve means, and a valve seat of the valve box is opened and closed by a valve body, and by opening and closing the valve body, the powder is powdered from its supply chamber. The powder is intermittently sent and stored in the space inside the powder dropping pipe from at least the upper end of the powder dropping pipe to the upper end of the powder dropping adjustment rod, and the stored powder is guided in the guide hole of the powder dropping adjustment rod. The powder-spraying device of the printing press according to claim 2, wherein the powder-spraying device is naturally dropped and sent into the storage chamber. 4. An optical sensor for holding a predetermined amount of powder in the powder accommodating chamber, which detects the state when the level of the powder falls below the set level and participates in opening and closing the valve body. , Despite the opening and closing of the valve, powder
4. The powder sprinkling device for a printing press according to claim 3, further comprising an optical sensor for detecting a state where the level of the powder does not rise to warn the powder supply of the powder to the supply chamber.