JPH07214978A - Device for detecting air passage of ink-containing writing utensil - Google Patents

Abstract

PURPOSE:To prevent an erroneous judgment due to leakage of air in respect in detecting of an air circulation hole formed in the vicinity of the shaft cylinder tip end of an ink containing writing utensil. CONSTITUTION:Step parts for sealing the front and rear parts of an air circulation hole 102 are formed on the mounting hole-inner surface of a holding block for mounting an air circulation part 102 formed in the proximity of the shaft cylinder tip end of an ink containing writing utensil, and a detector hole 19 is formed between the step parts in order to carry or such in gas to the detector hole 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air flow hole detecting device for a writing tool or the like in which an air flow hole is formed near the tip of a writing tool containing ink.

[0002]

2. Description of the Related Art First, an air circulation hole 102 formed in a writing instrument 101 or the like will be briefly described. An air circulation hole 102 is formed in the vicinity of the tip of a cylindrical shaft 101, such as a water-based ballpoint pen, an oil-based ballpoint pen, and a felt-tip pen, which generally contains ink. The formation position of the air circulation hole 102 varies depending on the object, but particularly in a writing instrument containing a water-based ink, it is formed substantially in the vicinity of the pen tip in front of the cylindrical shaft 101. The air circulation hole 102 is formed to return the pressure inside the cylindrical shaft 101, which is reduced by the ink protruding by writing, to the original pressure by taking in air from the outside. That is, it is formed so that the pressure inside the tubular shaft 101 is always kept constant with the external pressure.

Next, a conventional air circulation hole detecting device will be described with reference to FIG. A rubber-like elastic member 104 is arranged and fixed via a bracket 105 behind the tubular shaft 101 of the writing instrument that is sequentially conveyed from the conveyer 103. The elastic member 104 is attached to the tubular shaft 101.
The rear end opening 106 is in close contact, and air leakage from the rear end opening 106 is prevented. On the other hand, in front of the press-fitting hole 108 into which the pen tip or the like formed on the tubular shaft 101 is press-fitted, the air passage 1 for detecting the presence or absence of the air circulation hole 102.
An air supply head 110 on which 09 is formed is arranged. Further, the air supply head 110 is arranged by an air cylinder 111 so as to be able to move forward and backward with respect to the cylindrical shaft 101. Reference numeral 112 denotes a tube connected by a compressor (not shown) that supplies air to the air supply head 110.

Next, the operation will be described. The cylindrical shaft 101 that is sequentially conveyed is temporarily stopped, and the air cylinder 11
1 is operated to move the air supply head 110 forward to press the tubular shaft 101 against the elastic member 104. Next, air is supplied from the tube 112 into the cylindrical shaft 101. Here, when the air circulation hole 102 is formed, the supplied air leaks from the air circulation hole 102, and the compressor is judged to be a good product without any abnormal load. On the contrary, when the air circulation hole 102 is not formed, the supplied air does not leak and the compressor is judged to be defective because of an abnormal load.

[0005]

By the way, in the above-mentioned prior art, even if the air circulation hole 102 is closed due to a defect, the elastic member 104 is deteriorated, or the rear end of the cylindrical shaft 101 is not closely attached to the elastic member 104. However, air may leak from the poorly adhered part, and even in such a case, the compressor is judged to be a good product because no abnormal load is applied. Further, the tip of the cylindrical shaft 101 (the press-fitting hole 1
08) and the air supply head 110 may also be in contact with each other, and the above air leakage may occur.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide an inner surface of an insertion hole of a holding block into which an air circulation hole portion formed near the tip of a barrel of an ink-containing writing instrument is inserted. The gist of the invention is to form a step portion that seals around the air circulation hole, form a detection hole between the step portions, and feed or suck gas into the detection hole.

[0007]

1 and 2 show an embodiment of the present invention. Above the conveyor 2 in which the air circulation hole 102 such as a writing instrument and the cylindrical shaft 101 are sequentially conveyed, a pressing block 4 that temporarily presses the cylindrical shaft 101 via an elastic member 3 such as a spring moves up and down. Arranged freely.
On the other hand, an air circulation hole detection unit 5 described later is arranged at a position facing the transport conveyor 2. The air circulation hole detecting unit 5 is connected to the slide unit 7 via an elastic member 6 such as a spring. The slide unit 7 is connected to a cylinder rod 11 of an air cylinder 10 fixed to a base 9 via a bracket 8, and the operation of the air cylinder 10 causes the cylindrical shaft 1 to move.
It is possible to move forward and backward with respect to 01. Reference numeral 12 denotes a concave sliding block attached to the slide unit 7,
Reference numeral 13 is a guide rail fitted into the sliding block 12.

Next, the air circulation hole detecting unit 5 will be described in detail. An insertion hole 1 for holding a conical portion at the tip of a cylindrical shaft 101 in which an air circulation hole 102 is formed inside a cylindrical casing 14.
A holding block 16 on which 5 is formed is arranged. An O-ring 17 for sealing the rear portion of the air circulation hole 102 of the cylindrical shaft 101 is attached to the inner surface of the holding block 16 so as to be in close contact with and before and after the air circulation hole 102, and the front portion of the air circulation hole 102 is attached. A step portion 18 for sealing is formed. A detection hole 19 through which air to be detected is sent or sucked is formed between the inner surface step portions 18 and 27. Also,
A nipple 20 for sending air to the detection hole 19 is attached to the housing 4, and an air tube 21 connected to a compressor (not shown) is attached to the nipple 20.

Inside the holding block 16, a push rod 23 for positioning by lightly pressing the front end of the tubular shaft 101 is urged toward the tubular shaft 101 by an elastic member 24 such as a spring. It is arranged in a closed state.

FIG. 3 shows a second embodiment of the present invention. Reference numeral 26 is a holding block in which an insertion hole 25 for holding the tip conical portion of the cylindrical shaft 101 similar to that of the first embodiment is formed.
An O-ring 28 that seals the front part of the air circulation hole 102 of the cylindrical shaft 101 is attached to the inner surface, and a step portion 27 that seals the rear part of the air circulation hole 102 is formed. The other structure is similar to that of the first embodiment.

Next, a method of detecting the air circulation hole 102 will be described. The cylindrical shaft 101, which is sequentially conveyed, is temporarily stopped, and the pressing block 4 is moved down to move the cylindrical shaft 10
Fix 1 Then, the air cylinder 10 is operated to move the air circulation hole detection unit 5 forward, and the tip of the cylindrical shaft 101 is inserted into the insertion hole 15. By this inserting operation, the inner surface step portions 18 and 27 of the holding block 16 hold the two ends of the tubular shaft 101 at appropriate intervals (see FIG. 2). In this state, air is supplied (sent) from the air tube 21 into the holding block 16 through the detection hole 19.
To do. Here, when the air circulation hole 102 is formed, the supplied air passes through the air circulation hole 102 and the cylindrical shaft 1
01 is leaked from the rear end opening 106, and the compressor is judged to be non-defective without any abnormal load. On the contrary, when the air circulation hole 102 is not formed, the supplied air does not leak and stays in the holding block 16, and it is determined that an abnormal load is applied to the compressor and the compressor is defective.

In this embodiment, the presence or absence of the air circulation hole is detected by supplying air into the holding block, but it may be detected by sucking the air in the holding block. As an example, if not sucked in the suction operation, it may be judged as defective, and if sucked, it may be judged as non-defective. In other words, if the circulation hole is not formed, the suction device will be forced to operate unreasonably, and if the circulation hole is formed, suction can be reasonably performed through the cylindrical shaft and the circulation hole. I will be.

[0013]

According to the present invention, a step portion for sealing the front and rear of the air circulation hole is formed on the inner surface of the insertion hole of the holding block into which the air circulation hole portion formed near the tip of the barrel of the writing instrument with ink is inserted. Since the detection hole is formed between the stepped portions and the gas is introduced or sucked into the detection hole, the air leak to be detected is prevented as much as possible, and the air formed on the cylindrical shaft in which misjudgment is eliminated as much as possible. It is possible to provide a detection device for a through hole.

[Brief description of drawings]

FIG. 1 is a front sectional view of an entire first embodiment of the present invention.

FIG. 2 is a front sectional view of an air circulation hole detection unit portion of FIG.

FIG. 3 is a front sectional view of an air flow hole detection unit portion according to a second embodiment of the present invention.

FIG. 4 is a front sectional view of a conventional device.

[Explanation of symbols]

 101 Cylindrical Shaft 102 Air Circulation Hole 2 Conveyor 5 Air Circulation Hole Detection Unit 10 Air Cylinder 14 Housing 15 Insertion Hole 16,26 Holding Block 17,28 O Ring 18,27 Step 19 Detection Hole

Claims (3)

[Claims] 1. A step portion for sealing the front and rear of the air circulation hole is formed on an inner surface of an insertion hole of a holding block into which an air circulation hole portion formed near a tip of a shaft cylinder of a writing instrument with built-in ink is formed. An air circulation hole detection device for a writing instrument with a built-in ink, wherein a detection hole is formed between the detection hole and a gas is introduced or sucked into the detection hole. 2. The writing instrument with a built-in ink according to claim 1, wherein an O-ring for sealing a front portion of the air circulation hole of the cylindrical shaft is attached to an inner surface of the insertion hole of the holding block, and a step portion for sealing a rear portion of the air circulation hole is formed. Air flow hole detection device. 3. An air circulation hole detecting device for a writing instrument with a built-in ink according to claim 1, wherein an O-ring for sealing the front portion of the air circulation hole is attached to the inner surface of the insertion hole of the holding block, and a step portion for sealing the rear portion is formed.