JP2580541Y2 - Gear pump for ink circulation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a gear pump used for supplying ink to a gravure printing machine or the like.

[Prior Art] Generally, in a printing section of a gravure printing machine,
As shown in FIG. 4, ink is applied to the entire plate cylinder 22 from the ink pan 21 and excess is scraped off by the doctor 23, and at the same time, is filled in the concave points of the plate. The ink is transferred to the running paper 25. In this case, the ink is supplied from the ink tank 26 to the ink pan 21, but from the viewpoint of preventing the solvent from evaporating and increasing the viscosity, and preventing the ink from staying in the ink pan 21.
The ink is circulated between the ink pan 21 and the ink tank 26. Adjustment of ink viscosity etc.
To do it.

Various types of ink circulation pumps 27 and 28 used in the path between the ink pan 21 and the ink tank 26 have conventionally been used. Gear pumps as shown in the figure are widely used. This gear pump is commercially available,
A gear pump main body 31 and a motor section 32 are arranged side by side, and the gear pump is transmitted by transmitting the rotational force of a rotating shaft 33 of the motor section 32 to a drive side gear shaft 35 via a transmission belt 34. It is designed to be driven.

[Problems to be Solved by the Invention] By the way, commercially available gear pumps as mentioned in the prior art are originally designed to feed oil, and since oil itself has a sealing property, Although the oil pan does not leak from the gap between the bearing portion 37 and the gear shaft 35 in the casing 36 of the gear pump body 31 even when the ink pan 21 and the ink tank 26 are
When the gravure ink is used during the period, the gravure ink has a problem in that the ink is inevitably leaked from the gap between the gear shaft 35 and the bearing 37 because of its high fluidity.

Further, in the conventional gear pump, since the gear shaft 35 is driven by the transmission belt 34 as described above, the gear shaft 35 is bent and abrasion occurs between the gear shaft 35 and the bearing portion 37, which further promotes ink leakage. There were also points.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an ink circulation gear pump that does not cause ink leakage and that is efficient.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an ink circulation gear pump provided on an intermediate route between an ink pan and an ink tank. A hollow box is provided adjacent to the casing itself and surrounding a cantilevered drive-side gear shaft in a state of being connected to one side of the casing of the gear pump main body, and an ink inflow side from a side hole of the hollow box. And a rotating shaft of a motor unit is directly connected to the gear shaft in the gear pump body so that the gear shaft is in the vertical direction and the suction port and the discharge port of the casing are at the same height. Is horizontal, and the motor is located above the gear pump body, and the motor and gear pump body are It is characterized by.

[Operation] In the gear pump having the above-described configuration, the bearing portion of the gear shaft in the gear pump main body is oriented upward. Further, the torque of the motor is transmitted directly to the gear shaft. Then, the ink leaking from the gap between the casing of the gear pump main body and the gear shaft into the upper hollow box body is returned to the path on the ink inflow side through the bypass.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an external view showing an ink circulation gear pump according to the present invention together with a carriage on which it is mounted, FIG. 2 is a perspective view of a gear pump main body, and FIG.

The ink circulation gear pump includes a gear pump main body 1 and a motor unit 2, both of which are mounted on a portable moving table 3.

The gear pump body 1 has a pair of gears 5 housed in a casing 4, an intake port and a discharge port are provided in the casing 4 adjacent to the gear 5, and a drive-side gear shaft 6 is connected to the casing 4. 4 extends outside the casing 4 through the opening 7. A cylindrical hollow box 8 surrounding the gear shaft 6 is provided in a state of being connected to the casing 4. A side hole 9 formed in a side wall of the hollow box 8 and a passage 10 on the ink inflow side are provided. A bypass 11 is provided between and. Further, a cylindrical member 12 surrounding the gear shaft 6 is mounted above the hollow box 8, and a bearing 13 and a seal 14 are disposed on the cylindrical member 12. The casing 4 is installed below the movable base 3 by the mounting member 15 in a state where the casing 4 is horizontal so that the gear shaft 6 is in the vertical direction and the suction port and the discharge port of the casing 4 are at the same height.

On the other hand, the motor unit 2 is formed of a known three-phase induction motor having a built-in speed reducer, and is mounted on the movable table 3 by a mounting member 17 with its rotating shaft 16 in the vertical direction. The lower end of the rotating shaft 16 is connected to the upper end of the gear shaft 6 of the gear pump body 1 via a joint 18.

The ink circulation gear pump having the above configuration is used in a printing section of a gravure printing machine to be disposed in the middle of a connection path connecting the ink pan and the ink tank to circulate the ink. Then, as shown in FIG. 3, the ink is sucked into the casing 4 of the gear pump body 1 from the inflow path 10 on the right side and is discharged from the outlet 19 on the left side. In this case, a part of the ink leaks through the gap between the opening 7 of the casing 4 and the gear shaft 6, but the leaked ink accumulates inside the hollow box 8, and when the ink exceeds the height of the side hole 9, the bypass 11 To the supply side path 10. Note that the inside of the hollow box 8 is in a state close to substantially atmospheric pressure because external air naturally flows in from the gap between the bearing 13 and the seal 14 and the gap between the hollow box 8 and the gear shaft 6. The ink which has exceeded the height of the side hole 9 is smoothly sucked by the gear 5 and flows smoothly due to a pressure difference between the two in the supply side path 10 which is lower in pressure than the inside of the hollow box 8.

In addition, since the gear shaft 6 is directly connected to the rotating shaft 16 of the motor unit 2 by the joint 18, the rotating force of the motor unit 2 directly acts on the gear shaft 6 of the gear pump body 1 and is transmitted without bending the gear shaft 6. Is done.

[Effect of the Invention] As described above, the ink circulation gear pump of the present invention is provided with the hollow box surrounding the drive-side gear shaft while being connected to the casing of the gear pump main body, and the side hole of the hollow box is provided. Ink that has leaked from the opening of the casing and the gap between the gear shaft is returned to the ink supply side by providing a bypass that connects to the path on the ink inflow side, and ensures that ink leaks from the gear pump body. Can be prevented.

In addition, since the rotation shaft of the motor unit and the gear shaft of the gear pump body are directly connected, the gear shaft does not bend during driving as in the conventional one, and wear on the casing of the gear pump body is reduced, and the gear pump is reduced. Life can be extended.

Furthermore, the suction port and the discharge port are provided on the casing itself adjacent to the gears, and the casing is horizontal so that the suction port and the discharge port are at the same height, so that the structure is simple and the ink circulation efficiency is low. high.

[Brief description of the drawings]

FIG. 1 is an external view showing a gear pump for ink circulation according to the present invention together with a carriage on which it is mounted, FIG. 2 is a perspective view of a gear pump main body, FIG.
The figure is a schematic diagram showing a printing unit in a gravure printing machine, and FIG.
The figure is a schematic diagram showing a conventional gear pump. DESCRIPTION OF SYMBOLS 1 ... Gear pump main body, 2 ... Motor part, 3 ... Mounting stand, 4 ... Casing, 5 ... Gear, 6 ... Gear shaft, 7 ... Opening, 8 ... Hollow box, 9 ... Side Hole, 10 ……
Inflow path, 11 Bypass, 12 Cylindrical member, 13
Bearing, 14 Seal, 15 Mounting member, 16
Rotating shaft, 17 mounting member, 18 coupling, 19 outlet
21 ... Ink pan, 22 ... Print cylinder, 23 ... Doctor, 24 ...
… Impression cylinder, 25… paper, 26… ink tank, 27, 28… pump, 31… gear pump body, 32… motor part, 33…
... Rotary shaft, 34 ... Transmission belt, 35 ... Gear shaft, 36
…… Casing, 37 …… Bearing part

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 62-40286 (JP, U) JP-A 62-132283 (JP, U) JP-A 51-108205 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] An ink circulation gear pump disposed on an intermediate route between an ink pan and an ink tank, wherein a suction port and a discharge port are respectively provided on a casing itself adjacent to a gear of a gear pump body, and one of the casings of the gear pump body. A hollow box surrounding the drive-side gear shaft of a cantilever type is provided in a state connected to the side, and a bypass is provided from the side hole of the hollow box to a path on the ink inflow side,
A rotating shaft of a motor section is directly connected to the gear shaft in the gear pump body, the casing is horizontal so that the gear shaft is in a vertical direction, and the suction port and the discharge port of the casing are at the same height, and the motor section is connected to the gear pump body. A gear pump for circulating ink, wherein the motor unit and the gear pump main body are arranged vertically above the ink pump.