JPH04256407A - Dust recovery filter bag and production of filter device - Google Patents

Abstract

PURPOSE:To uniformly and surely produce a dust recovery filter to be mounted in a picture forming device in a short time. CONSTITUTION:Sheet-shaped filter members 3a(4a) of a nylon textile material are folded in two and matched, and the obtained L-shaped parts 6 and 6a are ultrasonically welded to form a dust recovery filter bag 5 with one end opened. The part 7 of the filter 5 is ultrasonically welded to the one face of the pierced flange 2 made of a nylon plastic material to produce a flanged dust recovery filter device 10.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for manufacturing a filter bag for collecting dust and a filter device used in an image forming apparatus.

0002

2. Description of the Related Art Generally, toner and paper dust scattered when an image forming apparatus is operated is sucked through a duct installed at a key point in the apparatus and stored in a bag-shaped dust collection filter connected to the duct. It is set to be collected. Conventionally, in order to manufacture the above-mentioned dust collection filter, each side end of a sheet-like filter member that has been cut or punched into predetermined dimensions to be joined is sewn together with thread using a sewing machine or the like, and one side is left open. A bag-shaped dust collection filter bag is produced. In addition, the dust collection filter device with a flange connected to the duct is molded using, for example, a plastic material, and the side peripheral surface where the bag-shaped dust collection filter bag opens is attached to one surface of the flange, which is hollowed out. It was made by sewing it together with thread.

0003

[Problems to be Solved by the Invention] In general, a filter bag for collecting dust has a bag-like filter bag with relatively open mesh on the inside to enhance the collection effect, and a filter bag of the same shape with narrow mesh on the outside exclusively for ventilation. are constructed by overlapping each other.

[0004] As mentioned above, it is a very labor-intensive task to overlap each bag and sew together the joints (two or more places) one by one with thread to form a bag shape. In addition, the above-mentioned flange member is a relatively thick member molded using, for example, a nylon-based plastic material, and sewing the flange and the filter bag together is a very laborious and time-consuming task. ing.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a method for easily, uniformly and reliably manufacturing a filter for collecting dust.

[0006]

[Means for solving the problem] This purpose is as follows (a)
, (b), (c). (a) In a dust collection filter to be attached to an image forming apparatus, each joined part of a sheet-like filter member is welded using ultrasonic waves to form a bag with an opening on one side to form a dust collection port. A method for manufacturing a filter bag for dust collection, characterized in that:

(b) In a dust collection filter attached to an image forming apparatus, a bag-like dust collection filter bag with an opening on one side where dust is to be collected is formed from a sheet-like filter member; A method of manufacturing a filter device for collecting dust, characterized in that the side peripheral surface of the opening of the bag is welded to one surface of a hollow flange member using ultrasonic waves.

(c) In a dust collection filter attached to an image forming apparatus, each joined part of a sheet-like filter member is welded using ultrasonic waves, and a bag is opened on one side to form a dust collection port. A dust recovery filter bag characterized in that a dust recovery filter bag having a shape is formed, and the opening side peripheral surface of the dust recovery filter bag is welded to one surface of a hollow flange member using ultrasonic waves. A method for manufacturing a filter device for

[0009]

[Example] An embodiment of the present invention is shown in a plan view showing an expanded shape of a sheet-like filter member in FIG. 1(a) and in FIG. 1(b).
Fig. 2(a) is a perspective view showing the shape of an example of the dust collection filter bag, and Fig. 2(b) shows the flanges welded by ultrasonic processing. A perspective view showing the shape of the flanged dust collection filter device, a sectional view showing the ultrasonic processing of the flange and the dust collection filter bag in FIG. 3, and a cross section showing the configuration of the flanged dust collection filter device in FIG. This will be explained using figures.

As shown in FIG. 2(a), a bag-shaped dust collection filter bag 5 with an opening on one side uses a relatively coarsely woven sheet made of plastic fiber material on the inside to trap toner, paper dust, etc. The inner filter bag 4, which collects the air, and the outer filter bag 4, which is made of a finely woven sheet of plastic fiber material on the outside thereof, and the outer filter bag 3, which has the same shape and is used exclusively for ventilation, are joined at predetermined points and overlapped to form a single body. It is structured as follows. Further, in the flanged dust collection filter device 10 shown in FIG. 2(b), a flange 2 molded using a nylon plastic material and the dust collection filter bag 5 are integrally joined.

[0011] The dust collection filter bag 5 and the flange 2 are both made of flame-retardant materials that meet UL standards.

In order to eliminate the above-mentioned problems, the present invention improves the method for manufacturing the dust collection filter bag 5 and the flanged dust collection filter device 10 as follows.

That is, an L-shaped joint is formed by a joint 6 on the bottom and a joint 6a on one side to form the dust collecting filter bag 5 shown in FIG. 2(a) into a bag shape. are welded using ultrasonic processing. In addition, the flanged dust collection filter device 1 shown in FIG.
0 said flange 2 and said dust collection filter bag 5
The welding point 7 between the two parts was similarly welded by ultrasonic processing.

FIG. 1(a) shows the shape of unfolded sheet-like filter members 3a, (4a) before welding of the outer filter 3 and the inner filter 4 constituting the dust collection filter bag 5, respectively. The dashed line A in the center is 2
The folding point of the fold is shown, B at the lower end indicates a range corresponding to the welding point 6, and both ends C indicate the welding point 6a.
It shows the range corresponding to .

Then, as shown in FIG. 1(b), the inner filter member 4a is placed on the anvil 13 of the ultrasonic processing machine 11.
and the outer filter member 3a are arranged on the anvil 13 in a state where they are overlapped and folded in half.
The guide surface of the guide plate 14 at the location is set as a guide.

Then, a predetermined amplitude is applied by an ultrasonic oscillator (not shown), and the L-shaped tool horn 12 located above and operating up and down in the direction of the arrow is lowered to remove the outer filter bag 3 and the inner filter. The sheet-shaped filter members 3a, 4a are integrally welded by pressing against the L-shaped joining points 6, 6a to be welded to the bag 4. This welding time ends in a very short time of 1 to 2 seconds, and the tool horn 12 rises and returns to its home position. Although not shown, the sheet-like filter members 3a and 4a, which are folded in half and overlapped, are attached to the anvil 13.
It is set on top and fixed using an appropriate method until the welding is completed to prevent the welded area from shifting. In this way, the ultrasonically welded bag-shaped filter bag 5 for collecting dust with one side open is produced. and said anvil 1
For example, place the joint 6 removed from 3 on the bottom side of 6.
The shape is arranged as shown in FIG. 2(a) by positioning a on the side surface side. In addition, the flanged dust collection filter device 10 shown in FIG. 2(b) is configured to apply ultrasonic waves to one surface of the flange 2, which is a plastic molded member with a hollowed out tip on the opening side of the dust collection filter bag 5. The flanged dust collection filter device 10 is manufactured by welding through processing. This ultrasonic machining method is performed using an ultrasonic machining machine 1 as shown in Fig. 3.
The flange 2 is set on the guide portion 17a of the anvil 17 provided at the guide portion 17a with the surface to be welded facing upward, and then the bag-shaped dust collection filter bag 5 is placed on the guide portion 17a of the anvil 17.
Insert it according to the following, bend the circumference of the tip part as shown in the figure, and overlap it with the surface of the flange 2. Then, the tool horn 16, which has been given a predetermined amplitude by an ultrasonic oscillator (not shown), is lowered in the direction of the arrow and pressed against the bent peripheral surface of the dust collection filter bag 5 to remove the dust. A joint 7 between the collection filter bag 5 and the flange 2 is welded together. This welding time ends in 1 to 2 seconds as described above, and the tool horn 16 rises and returns to the home position.

[0017] The flanged dust collection filter device 1
As an example, the processing time is 2 to 3 minutes per piece to form the flanged dust collection filter device 10 by stitching with thread, whereas the ultrasonic processing according to the present invention takes 0 as an example. If you use the above-mentioned anvil 13,
30 per piece including installation, removal and incidental work to 17
The flanged dust collection filter device 10 can now be manufactured in a required time of about seconds. Furthermore, the joints welded by ultrasonic processing are more uniform and reliable than in the past. Although not shown in the drawings, the bag-shaped filter bag 5 for collecting dust may be formed into a bag-like shape by sewing together the joint parts corresponding to the ultrasonic welding parts with thread as in the past, or by other methods. It is also within the scope of the present invention to manufacture a flanged dust collection filter device by welding a dust collection filter to the flange 2 using the ultrasonic processing machine 15 in the same manner as described above.

[0018]

Effects of the Invention By welding by ultrasonic processing of the present invention, a dust collection filter bag and a filter device to be attached to an image forming apparatus can be manufactured uniformly and reliably in an extremely short period of time.

[Brief explanation of the drawing]

FIG. 1(a) is a plan view showing the expanded shape of a sheet-like filter member. FIG. 1(b) is a perspective view showing ultrasonic processing of a bag-shaped dust collection filter bag according to an embodiment of the present invention. FIG. 2(a) is a perspective view showing the shape of an example of a dust collection filter bag welded by ultrasonic processing according to an embodiment of the present invention. FIG. 2(b) is a perspective view showing the shape of a flanged dust collection filter device with flanges welded by the same ultrasonic processing. FIG. 3 is a sectional view showing ultrasonic processing of a flange and a bag-shaped filter bag for collecting dust according to one embodiment of the present invention. FIG. 4 is a sectional view showing the configuration of a flanged dust collection filter device.

[Explanation of symbols]

2...Flange 3...Outer filter bag 3a, 4a...Filter member 4
…Inner filter bag 5…Dust collection filter bag 6, 6a, 7…Ultrasonic welding location 10…Flanged dust collection filter device 11, 15…
Ultrasonic processing machine 12, 16...tool horn 13
,17...anvil

Claims (3)

[Claims] Claim 1: In a dust collection filter attached to an image forming apparatus, each joined part of a sheet-like filter member is welded using ultrasonic waves to form a bag with an opening on one side to form a dust collection port. A method for manufacturing a filter bag for dust collection, characterized in that the filter bag is formed into a shape. 2. In a dust collection filter to be attached to an image forming apparatus, a bag-like dust collection filter bag is formed from a sheet-like filter member with an opening on one side where dust is to be collected, and the dust collection filter bag is provided with a bag-like dust collection filter bag. 1. A method for manufacturing a dust collection filter device, characterized in that the opening side circumferential surface of the flange member is welded to one surface of a hollow flange member using ultrasonic waves. 3. In a dust collection filter attached to an image forming apparatus, each joined part of a sheet-like filter member is welded using ultrasonic waves to form a bag-like bag with one side open to form a dust collection port. For dust collection, the filter bag for dust collection is formed, and the opening side peripheral surface of the filter bag for dust collection is welded to one surface of a hollowed out flange member using ultrasonic waves. A method of manufacturing a filter device.