JP2560495Y2 - 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.
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 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, a wear-resistant portion is formed around a drive-side gear shaft extending to the outside of the casing through a bearing formed by a part of the casing. A gland packing is inserted into the gap between the gear shaft and its bearing so as to be located around the wear portion, a pressing member for pressing the gland packing is provided, and a rotation shaft of a motor unit is provided on the gear shaft in the gear pump body. The motor part is located above the gear pump body, and the suction port and the discharge port are respectively adjacent to the gear and the casing itself And the motor unit and the gear pump main body are placed vertically so that 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.

[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 rotational force of the motor is directly transmitted to the gear shaft, and the space between the gear shaft and the bearing is sealed by a pressed gland packing.

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 showing the gear pump body with a part thereof cut away, and FIG. 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 main body 1 has a pair of gears 5 and 6 housed in a casing 4, and a drive-side gear shaft 7 has an upwardly open bearing 8 formed by the casing 4.
And extends to the outside of the casing 4. Also,
A lower portion of the gear shaft 7 is provided with a wear-resistant portion 9 formed by applying a ceramic spray to the periphery thereof, and the gear shaft 7 and the bearing portion 8 are positioned around the wear-resistant portion 9. The gland packing 10 is inserted into the gap between the two.
Further, a pressing member 11 is provided above the gland packing 10.
The pressing member 11 presses the gland packing 10 by connecting the flange portion 13 thereof to the casing 4 by a pair of screws 12. Then, the gear shaft 7 is oriented in the vertical direction and the bearing portion 8 is positioned on the upper side, and the suction port and the discharge port provided in the casing 4 itself adjacent to the gears 5 and 6 are mounted at the same height. The member 14 is provided below the movable base 3.

On the other hand, the motor section 2 is composed 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 16 with its rotating shaft 15 in the vertical direction. The lower end of the rotating shaft 15 is connected to the upper end of the gear shaft 7 of the gear pump body 1 via a joint 17.

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. 3, but since the bearing 8 of the gear shaft 7 in the gear pump body 1 faces upward, the conventional horizontal type ink is used. In comparison with the above, the ink is less likely to leak from the gap between the gear shaft 7 and the bearing portion 8. The gear shaft 7 is a rotating shaft of the motor unit 2.
Since the motor unit 2 is directly connected to the gear pump 15 via the joint 17, the rotational force of the motor unit 2 directly acts on the gear shaft 7 of the gear pump main body 1 and is transmitted without bending the gear shaft 7. Since the wear-resistant portion 9 is sealed by the gland packing 10,
There is little wear and the sealing condition is good. If the gland packing 10 becomes worn,
By tightening the pressure member 12 and pushing the pressing member 11, the sealing state is always kept good.

In the embodiment described above, the gland packing 10 is pressed by appropriately pressing the pressing member 11 with the screw 12.
Is pressed, but a configuration in which the pressing member 11 is constantly pressed using a spring may be adopted.

[Effects of the Invention] As described above, the gear pump for ink circulation according to the present invention has the motor section and the gear pump main body arranged vertically, so that the bearing section of the gear shaft faces upward. Compared to the horizontal type, the amount of ink that leaks from the gear pump body through the space between the gear shaft and the bearing can be reduced. Since the gear shaft does not bend during driving like a thing, the wear with the casing of the gear pump main body can be reduced, and furthermore, a wear-resistant portion is provided on the gear shaft and the gland packing is inserted around the periphery in a pressed state. In addition, the leakage of the ink can be further prevented, and the life of the gear pump itself can be extended.

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. Therefore, 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 it is mounted, FIG. 2 is a perspective view showing the gear pump body with a part thereof cut away, and FIG. FIG. 4 is a schematic view showing a printing unit in a gravure printing machine, and FIG. 5 is a schematic view showing a conventional gear pump. DESCRIPTION OF SYMBOLS 1 ... Gear pump main body, 2 ... Motor part, 3 ... Moving table, 4
... casing, 5, 6 ... gear, 7 ... gear shaft, 8 ... bearing part, 9 ... abrasion resistant part, 10 ... gland packing, 11 ... pressing member, 12 ... screw, 13 ... flange part, 14 ... mounting member,
15 ... rotating shaft, 16 ... mounting member, 7 ... joint, 21 ... ink pan, 22 ... plate cylinder, 23 ... doctor, 24 ... impression cylinder, 25 ... paper, 26 ...
Ink tank, 27, 28… Pump, 31… Gear pump body, 3
2 ... Motor part, 33 ... Rotating 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. A wear-resistant portion is formed around a drive-side gear shaft extending to the outside of the casing through a bearing portion formed by the portion, and the gear shaft and the gear shaft are positioned so as to be located around the wear-resistant portion. Insert the gland packing into the gap between the bearings,
A pressing member for pressing the gland packing is provided, and a rotating shaft of a motor unit is directly connected to the gear shaft in the gear pump body, the motor unit is disposed above the gear pump body, and a suction port and a discharge port are respectively adjacent to the gear. And the motor unit and the gear pump main body are vertically arranged such that 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. Gear pump for ink circulation.