JPH0537330Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is a paper sheet counter that counts paper sheets by suctioning them with a pump, and reduces the noise generated in the exhaust pipe of the pump. The present invention relates to a sheet counting machine with a silencer that can be used.

``Prior Art'' Paper sheet counters used for counting banknotes in financial institutions and the like include those having structures as shown in FIGS. 4 and 5, for example.

The paper sheet counting machine shown in these figures was developed in 1982.
No. 100762, as shown in the figure, while rotating the rotary tube 1, bills are attracted to the suction shaft 2 provided on the upper periphery of the rotary tube 1, and as the suction shaft 2 rotates. The suction shaft 2 is turned over one by one and counted, and when the opening 3 provided on the circumferential surface of the suction shaft 2 rotates the paper sheet P on the holder 4 at an opposite angle, the suction pipe is opened. 5
It is connected to the vacuum pump 6 via the suction pipe 6 to attract the paper sheet P and close the suction pipe 5 at other angles.

In addition, exhaust air is blown onto the sides of the paper sheets P from an exhaust nozzle 8 at the tip of the exhaust pipe line 7 communicating with the vacuum pump 6 to facilitate separation of the paper sheets P from each other. The solenoid valve 9 provided in the middle of the exhaust pipe line 7 switches the exhaust gas to the exhaust port 10 after the counting of paper sheets P is completed, thereby preventing the generation of noise from the exhaust nozzle 8. .

``Problem to be solved by the invention'' By the way, in the paper sheet counting machine having the conventional configuration, as described above, the exhaust gas after counting is blown into the lower frame 11, so that the exhaust It is designed to eliminate the noise emitted from the nozzle 8, and since the lower frame 11 is larger than the upper frame 12, a sufficient soundproofing effect can be expected even if the air is exhausted inside.

However, today, various equipment has become smaller and smaller.
Compact size paper sheet counting machines that can be placed on a tabletop have also been developed, and unlike conventional large paper sheet counting machines, all paper sheet counting machines are housed in one frame. It is necessary to incorporate a mechanism. Therefore, ejecting the exhaust gas into such a frame after counting is the same as ejecting it from an exhaust nozzle, and a noise reduction effect cannot be expected, and the exhaust pipe becomes a new noise source. Vibrations were occurring due to pressure fluctuations in the rubber piping, and these vibrations were directly transmitted to the frame, causing noise.

This idea was made in view of the above circumstances,
It can also be applied to tabletop paper sheet counting machines, and
It is an object of the present invention to provide a paper sheet counting machine with a silencer that can reduce both noise caused by vibration of an exhaust pipe and noise emitted from an exhaust nozzle.

``Means for Solving the Problems'' This invention applies to a paper sheet counting machine that counts a bundle of paper sheets loaded in a holder by attracting them one by one to a suction shaft on a rotating cylinder and turning them over. A muffler made of a rigid body is provided in the middle of the exhaust side pipe of the pump that applies vacuum pressure to the suction shaft, and the muffler has a cylindrical shape, and the cross-sectional area of the internal space of the flow path is equal to that of the exhaust pipe. It is characterized by being larger than the cross-sectional area of the side pipe.

"Operation" According to this invention, when a noise wave is transmitted to the exhaust side pipe, it is transmitted into the cylindrical silencer having a flow passage cross-sectional area larger than the flow passage cross-sectional area of the exhaust side pipe, and at this time, As the volume expands, the wavelength of the noise waves transmitted through the exhaust pipe becomes larger, and as a result, the noise waves are attenuated and the generation of noise from the exhaust nozzle is reduced. On the other hand, due to pressure fluctuations occurring in the exhaust pipe, the exhaust pipe itself vibrates and generates noise, but since the silencer installed in the exhaust pipe is made of a rigid body, Vibration of the pipe can be suppressed, and as a result, noise caused by vibration of the exhaust pipe itself can be reduced.

"Embodiment" An embodiment of this invention will be described below with reference to FIGS. 1 to 3. In these figures, the same members as those in the conventional example are designated by the same reference numerals, and their explanations will be omitted.

A rotating cylinder 1 shown in FIG. 1 rotates counterclockwise around an axis 1a, and a suction shaft 2 provided along the outer periphery of the rotating cylinder 1 rotates clockwise around the axis 2a. At the same time, it revolves counterclockwise around the axis 1a. Further, the suction shaft 2 is configured such that an inner hollow portion 2b thereof is mechanically communicated with the air passage 1b of the rotary cylinder 1 when the center thereof is within the suction range.

A guide piece 20 is fixed to each of the suction shafts 2. This guide piece 20 is provided so as to protrude from the side surface of the suction shaft 2, and is used to position the paper sheet at the position X shown in FIG. 1 and to facilitate detection of different denominations.

Further, the air passage 1b of the rotary cylinder 1 is connected to a vacuum pump (pump) 6 via a suction pipe 5. An intake side filter 21 is provided in the middle of the suction line 5, and a vacuum pressure switch 22 is provided which detects the vacuum pressure within the suction line 5 and is activated when the set vacuum pressure is reached.

Further, on the discharge side of the vacuum pump 6, an exhaust pipe line (exhaust side pipe line) 7 is formed which leads to the exhaust nozzle 8 at the tip via an exhaust filter 23. A muffler 24, which is a feature of this invention, is interposed between the exhaust filter 23 and the exhaust nozzle 8 in the middle of the exhaust pipe line 7.

As shown in FIG. 2, this muffler 24 includes a hollow cylindrical body portion 24b having an expansion chamber 24a;
A connecting protrusion 24c is provided at one end of the main body 24 and communicates with the exhaust filter 23 side of the exhaust pipe line 7, and a connecting protrusion 24c is provided on the other end side of the main body part 24 and communicates with the exhaust nozzle 8 side of the exhaust pipe line 7. It is composed of a connecting protrusion 24d. The connecting protrusions 24c and 24d are each rigidly connected to the exhaust pipe 7, and the muffler 24 is made of a rigid body that is difficult to transmit vibrations generated in the exhaust pipe 7 from one side to the other. For example, metal or hard resin is suitable. Further, the shape and size of the silencer 24 are appropriately determined depending on the capacity of the vacuum pump 6, the size of the frame 25 of the paper sheet counter, and the like.

The exhaust filter 23 is for filtering carbon scraped from the inner wall of the cylinder by the rotation of the rotor of the vacuum pump (rotary pump) 6 and discharged into the exhaust pipe 7.
Further, reference numeral 30 is a pump motor that drives the vacuum pump 6, reference numeral 31 is a belt that transmits the drive of a counting motor (not shown) to the rotating cylinder 1, and reference numerals 32a, 3 are shown.
2b indicates pulleys respectively wound around the belt 31.

According to this embodiment, the following excellent effects can be achieved.

By providing a silencer 24 in the middle of the exhaust pipe line 7 to make a part of the exhaust pipe line 7 sound-deadening, the noise waves transmitted to the exhaust pipe line 7 can be By attenuating the noise waves by transmitting them into the cylindrical muffler 24 having a large channel cross-sectional area and increasing the wavelength of the noise waves transmitted through the exhaust pipe line 7 by utilizing the volume expansion at this time, The noise generated in the exhaust pipe line 7 can be reduced without installing a conventional solenoid valve, and the noise emitted from the exhaust nozzle 8 can be reduced.

In addition to the silencing effect of the exhaust filter 23, the exhaust pipe 7 itself can have a silencing effect, and the noise can be effectively suppressed not only after the banknote counting is completed but also during the banknote counting. It can be educational.

Since the muffler 24 is made of a material (such as metal or hard resin) and has a rigid structure (such as a rigid connection to the exhaust pipe 7) that does not easily transmit vibrations, pressure fluctuations occur in the exhaust pipe (rubber pipe) 7 and the exhaust gas is Even if vibration occurs in the pipe line 7, the vibration is blocked by the silencer 24 installed in the exhaust pipe line 7, and the silencer 2
4 is reduced, the vibration of the exhaust pipe 7 is reduced, and as a result, the generation of noise due to the vibration of the exhaust pipe 7 can be suppressed.

The silencer 24 itself can be produced at a low cost and is easy to install, so it can be applied not only to desktop paper sheet counting machines currently on the market, but also to conventional large-sized paper sheet counters. Changes etc. are also easy.

The results of a noise test conducted using the paper sheet counting machine of this embodiment and a conventional paper sheet counting machine are shown below. First, when measuring noise by installing a sound level meter 1m above the exhaust nozzle, the conventional one had a level of 69 dB, while the one of this example had a level of 64 dB. When the noise was measured by installing a sound level meter 1m away from the main unit, the conventional one was 65 dB, but the one in this example was 65 dB.
It was 61dB. That is, it was found that the paper sheet counting machine with a muffler of this embodiment can achieve a noise reduction effect of 4 to 5 dB compared to a conventional paper sheet counting machine without a muffler.

"Effects of the invention" As explained in detail above, this invention consists of a rigid muffler installed in the middle of the exhaust side pipe of the pump that applies vacuum pressure to the suction shaft, and the muffler is a cylinder. Since the cross-sectional area of the internal space is larger than the cross-sectional area of the exhaust side pipe, when noise waves are transmitted to the exhaust side pipe, the flow path of the exhaust side pipe is The noise waves are transmitted into a cylindrical silencer that has a cross-sectional area larger than the cross-sectional area of the flow path, and at this time, the volume expands and the wavelength of the noise waves transmitted through the exhaust pipe becomes larger, and as a result, the noise waves Attenuated noise generation from the exhaust nozzle is reduced. On the other hand, pressure fluctuations occurring in the exhaust side pipe cause the exhaust side pipe itself to vibrate and generate noise, but noise is generated from the exhaust side pipe. Since the installed muffler is made of a rigid body, it is possible to suppress the vibration of the exhaust side pipe, and as a result, it is possible to reduce the noise caused by the vibration of the exhaust side pipe itself.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of this invention. Figure 1 is a plan view showing the main parts of a paper sheet counter, and Figure 2 is a cross section taken along the line A-A in Figure 1. Figure 3 is a perspective view of the desktop paper sheet counter.
Figures 4 and 5 show a conventional example of this invention. Figure 4 is a piping diagram of the suction and exhaust system, and Figure 5 is a piping diagram of the suction and exhaust system.
The figure is an external perspective view of the paper sheet counter. 1... Rotating tube, 2... Suction shaft, 6... Vacuum pump (pump), 7... Exhaust pipe line (exhaust side pipe line), 2
4...Silencer.

Claims (1)

[Scope of utility model registration request] In a paper sheet counting machine that counts a bundle of paper sheets loaded in a holder by attracting them one by one to a suction shaft on a rotating cylinder and flipping them over, an exhaust side pipe of a pump that applies vacuum pressure to the suction shaft. A muffler made of a rigid body is provided in the middle of the channel, and the muffler has a cylindrical shape, and the cross-sectional area of the internal space of the muffler is larger than the cross-sectional area of the exhaust side pipe. A paper sheet counting machine with a silencer.