JPH10141235A - Tube pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube pump in which a pump is not enlarged even if a plurality of pumps are provided in parallel. SOLUTION: When respective cams 3 are rotated, respective pressing plates 2 are reciprocated by respective cams 3, and a tube 1 is pressed by one ends of respective pressing plates 2. Since respective pressing plates 2 are operated while their phases are deviated, the pressing position of the tube 1 is sequentially moved in the liquid discharging direction, and liquid A in the tube 1 is fed out to an outlet side. In this case, respective cams 3 are arranged on the other end sides of respective pressing plates 2 and brought in contact with respective pressing plates 2 from the outside, and therefore, the dimensions in the width direction of respective pressing plates 2 are prevented from being enlarged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube pump used as a means for feeding an undiluted beverage, for example, in a beverage vending machine.

[0002]

2. Description of the Related Art Conventionally, as a tube pump of this kind, for example, as described in Japanese Patent Application Laid-Open No. H08-113295, an elastic tube through which a liquid can flow and a large number of pressing plates for pressing the tube at one end. And a cam mechanism for reciprocating each pressing plate toward the tube, arranging each pressing plate in the liquid flowing direction of the tube, and setting each of the pressing plates so that the tube pressing position of the pressing plate sequentially moves in the liquid discharging direction. 2. Description of the Related Art There is known a tube pump in which liquid in a tube is caused to flow in a discharge direction by each pressing plate by reciprocating the pressing plates with a phase shift. In this tube pump, a hole for accommodating a cam is provided in each pressing plate,
The pressing plate is driven by bringing a rotating cam into contact with the inner surface of the hole.

[0003]

However, in the conventional tube pump, since the holes for accommodating the cams are provided in each pressing plate, the size of each pressing plate in the width direction becomes large.
For example, in a beverage vending machine having a plurality of tube pumps arranged side by side, there is a problem that the pump becomes large.

[0004] The present invention has been made in view of the above problems, and an object of the present invention is to provide a tube pump that does not increase the size of a pump even when a plurality of pumps are arranged side by side. It is in.

[0005]

In order to achieve the above object, according to the present invention, an elastic tube through which a liquid can flow, a plurality of pressing members for pressing the tube at one end,
A driving unit for reciprocating each pressing member toward the tube, arranging each pressing member in the liquid flowing direction of the tube, and pressing each of the pressing members so that the tube pressing position of each pressing member moves sequentially in the liquid discharging direction. In a tube pump in which the liquid in the tube is sent out by each pressing member by reciprocating with the phases shifted from each other, the driving means is formed by a plurality of cams abutting on the other ends of the pressing members. . Thereby, since each cam is arranged on the other end side of each pressing member and abuts against each pressing member from the outside, the dimension in the width direction of each pressing member does not increase.

According to a second aspect of the present invention, in the tube pump according to the first aspect, each of the cams is formed such that a pressing member that retreats with respect to the tube moves faster than a pressing member that advances with respect to the tube. I have. Accordingly, in addition to the function of the first aspect, the volume of the liquid storage portion surrounded by the contact point between one end of each pressing member and the tube increases, and the flow rate by one reciprocating operation of each pressing member increases.

[0007]

1 and 2 show an embodiment of the present invention. FIG. 1 is a side view of a tube pump, and FIG.
FIG. 7 is an explanatory diagram of the operation of the pressing plate.

This tube pump comprises a tube 1 through which a liquid flows, and a plurality of pressing plates 2 which press the tube at one end.
A plurality of cams 3 as driving means for reciprocating each pressing plate 2, and a tube 1 pressed by each pressing plate 2
And a support plate 4 for supporting the

The tube 1 is made of an elastic material such as rubber and has one end opened downward and the other end connected to a liquid supply source (not shown).

Each pressing plate 2 is arranged on the side of the tube 1 along the flow direction of the liquid, and is arranged with one end thereof facing the tube 1. Each pressing plate 2 has a total of two long holes 2
a, 2b are provided, and each pressing plate 2 is provided in each of the long holes 2a, 2b.
Are inserted into the guide shafts 2c and 2d, respectively, which reciprocally support the same in the same direction. A spring 2e engaged with one guide shaft 2c is accommodated in one long hole 2a of each pressing plate 2, and the pressing plate 2 is urged toward the tube 1 by the spring 2e. Further, rollers 2f that are in contact with the cams 3 are attached to the other ends of the pressing plates 2, respectively.

Each cam 3 has a substantially semicircular shape having a circular peripheral surface 3a and a linear peripheral surface 3b, and a position eccentric from the center of the circle is fixed to a common shaft 3c. That is, each of the cams 3 has its peripheral surface 3a, 3b
And the shaft 3c is rotated in a fixed direction by a motor 3d.

The support plate 4 is formed between the tubes 1 so as to face the one end of each pressing plate 2 in a planar shape, and is urged toward the tube 1 by a leaf spring 4b attached to a substrate 4a.

In the tube pump constructed as described above, when each cam 3 is rotated by the motor 3d,
Each pressing plate 2 reciprocates by each cam 3, and each pressing plate 2
The tube 1 is pressed by one end of the tube. At this time, since the pressing plates 2 operate out of phase with each other, the pressing position of the tube 1 sequentially moves in the liquid discharge direction, and the liquid A in the tube 1 is sent to the outlet side. In this case, since each cam 3 is disposed on the other end side of each pressing plate 2 and abuts against each pressing plate 2 from the outside, the size of each pressing plate 2 in the width direction does not increase. Further, as shown in FIGS. 2A to 2E, each pressing plate 2 gradually advances with respect to the tube 1 by contact with the circular peripheral surface 3a of the cam 3, and at the same time, When it reaches the surface 3b, it quickly retreats with respect to the tube 1, so that the volume of the liquid storage portion surrounded by the contact point between one end of each pressing plate 2 and the tube 1 becomes large, The flow rate due to the reciprocating operation increases.

As described above, according to the tube pump of this embodiment, each cam 3 is arranged on the other end side of each pressing plate 2 and is brought into contact with each pressing plate 2 from the outside. The dimension of the plate 2 in the width direction can be reduced, and the size of the pump can be reduced even when a plurality of pumps are arranged side by side, for example, in a beverage vending machine. In addition, each cam 3
Is formed into a substantially semicircular shape, whereby the pressing plate 2 retreating with respect to the tube 1 is moved faster than the pressing plate 2 advancing with respect to the tube 1, and one end of each pressing plate 2 and the tube 1
Since the volume of the liquid storage portion surrounded by the contact point with the pressure plate is increased, the flow rate of each press plate 2 by one reciprocating operation can be increased, and the liquid A in the tube 1 can be increased.
Can be sent out efficiently.

[0015]

As described above, according to the tube pump of the first aspect, since the widthwise dimension of each pressing member can be reduced, a plurality of pumps such as a beverage vending machine can be used. Even in the case of juxtaposition, the size of the pump can be reduced.

Further, according to the tube pump of the second aspect, in addition to the effect of the first aspect, the flow rate by one reciprocating operation of each pressing member can be increased, so that the liquid in the tube is efficiently pumped out. be able to.

[Brief description of the drawings]

FIG. 1 is a side view of a tube pump showing a first embodiment of the present invention.

FIG. 2 is a diagram illustrating the operation of a tube pump.

[Explanation of symbols]

 1 ... tube, 2 ... pressing plate, 3 ... cam, A ... liquid.

Claims (2)

[Claims] An elastic tube through which a liquid can flow, a plurality of pressing members for pressing the tube at one end, and a driving means for reciprocating each pressing member toward the tube,
By arranging each pressing member in the liquid flowing direction of the tube and reciprocating each pressing member with a phase shift with respect to each other so that the tube pressing position of each pressing member sequentially moves in the liquid discharging direction, the liquid in the tube is changed. A tube pump, wherein the driving means is formed by a plurality of cams abutting on the other end of each of the pressing members. 2. The tube pump according to claim 1, wherein each of the cams is formed such that a pressing member moving backward with respect to the tube moves faster than a pressing member moving forward with respect to the tube.