JP2580540Y2 - 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. 3, 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, or 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.

As the ink circulation pumps 27 and 28 used in the path between the ink pan 21 and the ink tank 26, various types of pumps have been conventionally 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 includes a gear pump main body in which a pair of gears are housed in a casing, and a motor unit that drives the gear pump main body. In the ink circulation gear pump disposed in the path, the rotation shaft of the motor unit is directly connected to a cantilevered drive-side gear shaft extending outside the casing through a bearing formed on one side of the casing. In addition, the motor unit is disposed above the gear pump main body, the suction port and the discharge port are respectively provided in the casing itself adjacent to the gears, and the gear shaft is in the vertical direction and the suction port and the discharge port of the casing are at the same height. It is characterized in that the casing is horizontal so that the motor section and the gear pump main body are placed vertically.

[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. The torque of the motor is transmitted directly to the gear shaft.

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 movable table on which the ink circulation gear pump is mounted, and FIG. 2 is a schematic view of a main part of the ink circulation gear pump.

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 main body 1 is of a type having a pair of gears 5 housed in a casing 4, and a drive-side gear shaft 6 passes through an upwardly-opening bearing 7 formed by a part of the casing 4. It extends outside the casing 4. The mounting member 8 is arranged such that the gear shaft 6 is oriented in the vertical direction and the bearing portion 7 is located on the upper side, and the suction port and the discharge port provided in the casing 4 itself adjacent to the gear 5 have the same height. It is installed below the moving table 3. On the other hand, the motor unit 2 is formed of a known three-phase induction motor having a built-in reduction gear, and is mounted on the movable base 3 by a mounting member 10 with its rotating shaft 9 in a vertical direction. The lower end of the rotating shaft 9 is connected to the upper end of the gear shaft 6 via a joint 11.

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. In this case, the ink is sucked from the right side and discharged from the left side as shown in FIG. 2, but since the bearing 7 of the gear shaft 6 in the gear pump body 1 faces upward, the ink is It becomes difficult to leak from the gap of the bearing 7. Further, since the gear shaft 6 is directly connected to the rotating shaft 9 of the motor unit 2 by the joint 11, the rotating force of the motor unit 2 is directly applied to the gear shaft 6 of the gear pump body 1.
Will work.

[Effects of the Invention] As described above, the gear pump for ink circulation according to the present invention has the motor shaft and the gear pump main body arranged vertically so that the bearing of the gear shaft faces upward. The ink is prevented from leaking from the gear pump main body through the space between the gear pump and the bearing.

In addition, since the rotating shaft of the motor unit and the gear shaft are directly connected, the gear shaft does not bend during driving and wear on the casing of the gear pump body is prevented as in the conventional case, so that ink leaks. Can be further prevented, and the life of the gear pump itself can be extended.

Furthermore, since 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, the structure is simple and the ink circulation efficiency is low. high.

[Brief description of 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 the ink circulation gear pump is mounted, FIG. 2 is a schematic view of a main part of the ink circulation gear pump, and FIG. FIG. 4 is a schematic view 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 ... Bearing part, 8 ... Mounting member, 9 ... Rotation axis,
10 mounting members, 11 fittings, 21 ink pans, 22
... plate 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

Claims (1)

(57) [Scope of request for utility model registration] An ink circulation gear pump, comprising: a gear pump main body in which a pair of gears are housed in a casing; and a motor unit for driving the gear pump main body. The rotating shaft of the motor unit is directly connected to a cantilevered drive-side gear shaft extending to the outside of the casing through a bearing formed on the side, and the motor unit is disposed above the gear pump main body, and a suction port is provided. And a discharge port are provided in the casing itself adjacent to the gears, and the casing is horizontal 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. A gear pump for circulating ink, characterized by having a vertical position.