JPS5935997A - Rotary delivery type propelling pencil - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanical pencil in which a lead lead is fed out by rotating a lid relative to a barrel.

Knock-type mechanical pencils with a built-in collet chuck have the advantage of being able to reliably hold even thin lead leads and are less likely to break, but the rear-end force of the barrel and the appearance of the knock button protruding are due to the design. There is a problem in that it gives a strong impression to viewers as a high-class turtle marking tool. Therefore, it has been proposed that a cam is used to convert the rotational force into a knocking force in the entire axis direction without providing a knock button, and by rotating the lid, the chuck is released and the lead core is fed out. In the mechanical pencil in this quiz, the amount of lead lead drawn out is constant and not proportional to the rotation distance, so in order to retract the lead lead that has been fed out in a rainbow, rotate the lid and put the chuck in the state 1 - It was upside down in a field where I had to apply a force in the backward direction to the lead core on top of the deck.

Therefore, the present invention allows the lead core to be easily advanced and retracted by rotating the lid in either direction. To provide a rotary feeding type nyagu pencil 1B that can be used.
Purpose 1: Insert the collet chuck body, which is slightly biased backward by a weak spring force, into the inside of the chuck 4!7 tube, which has a partially tapered inner surface. The rolling element disposed on the outer periphery of the lead core holding part of the chuck body and the above-mentioned taper part cooperate to move the lead core in the backward direction.
A chuck mechanism that grips only the working lead core, and a worm tooth that allows the lead core to pass through the center of the worm tooth, which is bored on the inner circumferential surface of the tip of the inner cylinder, which is housed in the shaft cylinder so that it can freely rotate forward and backward. The worm m engages with the worm teeth in the turtle case and rotates forward and backward, and the worm m east has a lead core moving mechanism that moves the lead core in the front and back directions by rotation H (M force) with respect to the lead core, and the inner cylinder is When reversing the lead core by rotating in the opposite direction, the toothed case moves forward due to the reaction force of the rotational friction force, pressing the rear end of the collet chuck body forward and releasing the grip on the lead core by kneading. Achieved by a rotating mechanical pencil.

Embodiments of the present invention will be specifically described below with reference to the drawings.

A chuck actuating tube 2 is irremovably attached to the tip opening of the shaft tube 1, and the chuck actuating tube 2 is a cylindrical body having a tapered portion 2a on the inner surface, and a cap 3 is attached to the threaded portion on the outer periphery.
is screwed on. Then, the collet chuck body 4 is pushed backwardly by the chuck spring 5 with a small spring constant, is inserted into the chuck operating tube 2, and is expanded in the radial direction by inserting the tip η. A chuck mechanism is constructed by disposing a rolling element 6 on a recessed seat formed on the outer surface of the lead core holding part 4a which is about to loose and is assembled so that it can freely bite into the tapered part 2a. ing. Therefore, when the lead core A moves forward inside the collet chuck body 4, the rolling elements 6 rotate and move forward, and the lead core holding portion 4a expands in the radial direction and is released from holding the lead core. Core A
When the lever tries to move backward, the rolling element 6 bites into the tapered portion 2aK and cannot be held in place by the L. Next, to explain the lead core moving mechanism, an inner cylinder 7 that also serves as a lead core case is accommodated in the shaft cylinder 1 and is freely rotatable in forward and reverse directions. It is engraved. A gear case 8 is fitted into the portion where the worm teeth 7a are carved so as to be movable back and forth within a predetermined range, and at the forward limit position, its tip surface contacts the rear end of the collet chuck body 4 and moves it forward. As it used to be. This gear case 8
Fi has a lead passage hole 8a in the axial direction in the center, and in the interior space there is a worm # 9 made of hard synthetic resin and an idler gear 10, each of which has a rotating shaft 1 that is perpendicular to the axial direction and parallel to each other. The worm gear 9 meshes with the worm teeth 7aK and is driven to rotate at the same time.

The lead core A in the lead core passage hole 8a is pinched by the outer peripheral surfaces of the worm gear 9 and the idler gear 10, and when the worm gear 9 rotates forward and backward, the lead core A moves back and forth due to the rotational frictional force. Then, the lid 1 is attached to the elastic contact body 11 fixed to the rear end of the inner cylinder 7.
2 are removably fitted together under pressure, and when the lid 12f is rotated about the shaft [1], the inner cylinder 7 rotates. Note that in this specification, the rotation in the direction in which the lead/core A is advanced is referred to as normal rotation.

Therefore, in the rotary feeding type pencil with the above configuration, it is only necessary to rotate the lid 12 for feeding out the lead core A in the normal direction, and the worm tooth 1t9 rotates in the normal direction to reduce the rotational frictional force with the lead core A. As the lead core A moves forward, the tooth W case 8 retreats to the retreating position f due to the reaction force, but after that, the lead core A moves forward by a distance proportional to the rotation distance. At this time, the collet chuck body 4 moves forward in the direction M)A due to the rotation of the shovel rolling element 6, and the lead core grip is not released, but the lead core A is easily fed out. Next, in order to retract the lead core A after memorizing, the lid 12 should be rotated in the opposite direction, and the worm Ryoichi 9 will rotate in the reverse direction and the lead core A will try to retreat, but the collet chuck 4 will hold the lead core A at -1. ``Because there is one gun, the reaction force #
J East case 8 moves forward and after collet chuck 4 IIi
Press and advance. Therefore, the lead core grip is released by this forward movement, and the lead core A retreats and retreats.

In this way, the present invention is equipped with a chuck mechanism that allows the lead core to move forward freely and only engages the retracted lead, and a lead core moving mechanism that moves the lead core back and forth by forward and reverse rotation of the worm. Since the grip is released, it is possible to easily advance and retract the lead core, and since the advance +# is proportional to the rotation distance, it can be selected arbitrarily. And since the collet chuck is set at the inner RL, it is the same as a knock-type mechanical pencil, so even a thin lead lead will not break. , A has the advantage of being able to create a design f that gives a mark e as a marking tool.

[Brief explanation of drawings]

Figure v1 is a sectional view showing an embodiment of the present invention, and Figure 2 is a perspective view of the case.1...Shaft cylinder 2...Chuck operation 1 pipe 2a...
Part of taper 4... Collet chuck body 4a... Lead core gripping part 6... Rolling element 7... Inner cylinder 7a...
Worm tooth 8... Tooth market case 8a... Lead core passage hole 9... Worm tooth market 10... Idle gear 1
2...Applicant Sailor Mannengumi Co., Ltd. Agent Patent Attorney 1) Toranosuke Kon

Claims (1)

[Claims] The collet chuck body, which is slightly biased backward by a weak spring force, is inserted into the chuck operating tube which has a partially tapered inner surface, and the outer f of the lead core gripping part of the collet chuck body is inserted.
fK: The disposed rolling element and part of the taper cooperate L'
C A chuck mechanism that grips only the lead core moving in the backward direction, and a worm tooth provided on the inner peripheral surface of the tip of the inner cylinder, which is housed in the shaft cylinder so that it can freely rotate forward and backward, are connected to the center part of the lead core. It meshes with the worm tooth east in both paper cases passing through and rotates forward and backward.
When the ML1 inner cylinder is reversely rotated and the lead core is moved backward, the lead core moving mechanism moves the lead core in the front and back direction by the rotational friction force against the lead core of the worm. A rotating mechanical pencil characterized in that a holding case moves forward to push the rear end of the collet chuck body forward, thereby releasing the lead lead from the grip.