JPS6316280B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a tip notch that is devised so that the centering length obtained by one tip notch operation is always a constant length, regardless of the length of the tip protruding before the tip notch. Regarding formula sharpening pencils.

The tip-knot type sharpening pencil presses the lead protruding from the slider's core tube against the paper surface.
When the slider holding the core by the core carrying member and the chuck set biting the core are moved back together, and then the pressure is removed and the slider and chuck set are returned to their original state, the interaction between the two Centering is possible by changing the positional relationship. However, in this case, the centering length depends on the protruding length of the core before the tip notch and cannot be made constant. One method for centering a fixed length is to press the core so that the core protruding from the core tube is pulled in so that it is flush with the end surface of the core tube.
The purpose is to perform constant length centering in such a situation. However, since the protruding length of the lead to be retracted differs each time, the degree of deviation between the slider and the chuck set when the lead is pressed against the paper surface will change each time. It is necessary to develop a mechanism that enables constant length centering.

The purpose of the present invention is to provide a sharpening pencil with a tip that can meet the above-mentioned needs.
This was done for that purpose.

In order to achieve the above-mentioned object, the present invention provides a slider lock release pipe that satisfies the following requirements on the outer periphery of the chuck set. The requirements are that the lead is pushed in by the tip notch in the first stage until the slider locks in the retracted position, then in the second stage in which the lead is further pushed in, and then in the return process when the lead is no longer pushed in. When the third stage is to release the lock and the fourth stage is to return to the original state, the mutual positional relationship of the slider lock release tube with respect to the slider is the same as the first stage of core pushing.
and is constant in the second stage, and changes in the third and fourth stages of return, whereas in the mutual positional relationship with respect to the chuck set, it is constant, changes, constant, and changes in each stage of the first to fourth steps. It is. The following is an explanation of the embodiment shown in the drawings.

The slider 2 has a core tube 3 at the tip and a core entraining member 4 inside, and the slider 2 has an overhang 5 and a shaft tube 1.
The front end surface of the projecting portion 5 is pressed against the inner step end surface 1a of the shaft tube 1 by the elastic member 7 for the slider stretched between the end surfaces 6a of the member 6 fixed to the inside of the shaft cylinder 1, and a steady position is determined. When the lead is pushed in by the notch, the elastic member 7 is moved through the lead-carrying member 4 that holds the lead.
The rear locking position is set by an appropriate slider locking means 8, that is, in the illustrated example, the locking member 8a attached to the overhang 5 of the slider 2 is connected to the shaft cylinder 1. It is determined by engaging and locking the locking portion 8b formed on the integral member 6.

The chuck set 9, which holds and releases the core, is made up of a chuck elastic member 12 stretched between a chuck body 10 and a wedge tube 11, and a rolling element 13 interposed therein.
Therefore, against a force that pushes the biting core into the barrel 1, the wedge effect is further strengthened and the core clamping force is increased, but the biting core is pulled out from the barrel 1. In response to such a force, the chuck body 10 tends to move forward together with the core, so the wedge effect weakens and the mouth of the chuck tends to open, allowing the core to be pulled out.

Now, in the present invention, a slider lock release pipe 15 is provided between the shaft cylinder 1 and the chuck set 9, and the slider lock release pipe 15 is slidable in the front and back direction on the inner surface of the shaft cylinder 1.
5 A tube that exhibits relatively strong sliding frictional resistance against the inner surface, but can slide freely against the outer surface of the wedge tube 11, and is prevented from moving forward any further by the stepped portion 14 formed on the outer surface of the wedge tube 11. The body 18 is interposed. A seat body 19 is slidably fitted into the rear cylindrical portion of the wedge tube 11 and comes into contact with the rear end surface of the tube body 18, and the rear cylindrical portion of the wedge tube 11 is extendable and retractable at a friction fitting portion 20. A knot elastic member 23 is interposed between the protrusion 22 of the core tank 21 connected to the core tank 21, and by pressing the protrusion 22 against the inner step end surface 1c of the shaft tube 1, the tube body 18 is always kept forward. to repel. The above receiving body 19
can push the rear end of the slider lock release tube 15, and when the pushing part 16 formed at the front end of the slider lock release tube 15 comes into contact with the rear end surface of the member 6, the slider lock release tube is released. 15 is determined, and the distance between it and the rear end surface of the slider 2 in the steady position is length l. The slider lock release tube retraction length regulating means 17 is formed by the protrusion 17a protruding from the outer surface of the slider lock release tube 15 and the inner step end surface 1b of the shaft tube 1 that the projection 17a can come into contact with. The retracting length of the slider lock release pipe 15 from the normal position to the backward stop position is made equal to the length of the slider 2 from the normal position to the rear lock position.

The above-described resilient member 23 for the notch is an example in which the resilient member 23 is used for both the tip end and the rear end notches.
As in the example shown in the figure, there may be two resilient members 23a for the tip end notch and the resilient member 23b for the rear end notch. The shape of the seat body 19 in this case is as shown in FIG. 7, which is different from that in FIG. 1. Inner step end face 1 formed on slider lock release pipe 15
5a has a length l ₁ from the distal end surface of the wedge tube 11 in a steady state, but l ₁ can be made zero when the rear end is notched. When the rear end is notched in the core tank 21,
A front end surface 21a for pressing the rear end surface 10a of the chuck body 10 is formed.

Now, in FIG. 1, when the end of the core protruding from the core tube 3 by length x is pressed against the surface of the paper, the slider 2 holding the core with the core-carrying member 4, the chuck set 9 biting the core, Then, the slider lock release tube 15, which is connected to the tube body 18 interlocked via the stepped portion 14 by sliding friction resistance, retreats while maintaining a constant mutual positional relationship, and the resilient members 7, 23 or 2
Compress 3a. When the slider 2 is stopped by the locking means 8, the protrusion 17a of the slider lock release tube 15 comes into contact with the inner step end surface 1b of the shaft cylinder 1 (see FIG. 2). After that, if the core is continued to be pushed in, the chuck set 9 slides between the slider lock release tube 15 and the tube body 18, and the chuck set 9 that bites the core has a core protrusion length x such that the core and the end surface of the core tube 3 are flush with each other. , and a gap of length x is created between the rear end surface of the slider lock release tube 15 and the front end surface of the seat body 19 (the third
(see figure).

Next, release it from the paper. The slider 2 remains locked at the backward stop position, but the resilient member 23
The seat body 19 on which the restoring force acts pushes the tube body 18, and the tube body 18 pushes the wedge tube 11 via the stepped portion 14, and the slider is locked on the outer periphery of the tube body 18 with relatively strong sliding friction resistance. Since the release tube 15 is held, the chuck set 9 and the slider lock release tube 15 return together with their mutual positional relationship constant, and the slider lock release tube 15 is pushed against the rear end surface of the stopped slider 2. Centering of length l takes place between the parts 16 colliding (see FIG. 4). When the push portion 16 of the slider lock release tube 15 returns to contact with the rear end surface of the member 6, the locking means 8 is also released (see FIG. 5). In this way, the slider 2 returns to its original state by the force of the resilient member 7. Further, since the seat body 19 travels the length x and stops against the rear end surface of the slider lock release tube 15, the chuck set 9 also returns to its original state (see FIG. 6). At this time, the forward movement length of the slider 2 is larger than the forward movement length x of the chuck set 9, and as described above, the core-carrying member 4
Since the core can be pulled out from the chuck with a core holding force of , there is no change in the centering length l from the core tube 3.

The operation at the time of rear end knocking is such that the distal end surface of the wedge tube 11 is aligned with the inner step end surface 1 of the slider lock release tube 15.
5a, the centering of the length _l1 is performed, and then the front end surface 21a of the core tank 21
When the rear end face 10a of the chuck body 10 is pressed to open the chuck mouth, and then the rear end knob is stopped, the chuck retreats with the chuck mouth open due to the action of the friction fitting part 20, and at the end of the backward movement, Close the chuck's mouth. Therefore, in order to ensure that the centering length due to the tip notch is equal to the centering length due to the rear end notch, l and _l1 may be set to be the same length.

As is clear from the above description, the present invention includes a tube body 18 which is slidably fitted into a rear cylinder portion behind the step portion 14 on the outer surface of the wedge tube 11, and which is always elastically repelled forward. A slider lock release tube 15 is fitted to the slider lock release tube 15 so as to slide with relatively strong sliding friction resistance, and when the slider 2 and slider lock release tube 15 are both in the normal position, the slider lock release tube 15 is fitted so as to slide with relatively strong sliding friction resistance. A pushing part 16 is provided with a predetermined facing distance l from the end face, and a retreating length regulating means 17 for the slider lock release pipe is provided, which is equal to the length that the slider 2 retreats from the normal position to the rear locking position. This is extremely superior in that the centering length obtained by one operation of the tip notch is always constant regardless of the length of the core protrusion before the tip notch.

[Brief explanation of the drawing]

1 to 6 are cross-sectional views showing a first embodiment of the present invention, each showing the centering process using the tip notch, and FIG. 7 showing another embodiment of the present invention. 2 is a sectional view of a state corresponding to FIG. 1; FIG. 2...Slider, 11...Wedge tube, 14...Step part, 15...Slider lock release tube, 16...Press portion, 17...Retreat length regulating means for slider lock release tube, 18...Pipe body.

Claims (1)

[Claims] 1. A tube body 18, which is always repelled forward, is slidably fitted into the rear cylindrical portion behind the stepped portion 14 on the outer surface of the wedge tube 11, and the slider lock release tube 15 is attached to the tube body 18 with a relatively strong force. The slider locking release tube 15 is fitted with a pusher so that it slides due to sliding frictional resistance, and the slider locking release tube 15 has a pusher which exhibits a predetermined facing distance l from the rear end surface of the slider 2 when both the slider 2 and the slider locking release tube 15 are in a normal position. 16, and a retracting length regulating means 17 for the slider locking release tube that is equal to the length of the slider 2 retracting from the normal position to the rear locking position.