JPS604796Y2 - electric pencil sharpener - Google Patents

Description

[Detailed description of the invention] The present invention relates to a small and portable electric pencil device, and especially when such a small device is conveniently equipped with a tip length adjustment mechanism, Unless the mounting structure of this adjustment mechanism is specially devised, the overall size will be small and it will not be possible to store it easily.

The present invention takes this point into consideration and has been designed to simplify the overall assembly.

Hereinafter, one embodiment of the present invention will be described based on the drawings.
The main body 1 is composed of a main body cover 2 serving as an outer shell, a bottom cover 3, an inner frame 4 that is assembled into the main body cover 2 with the various parts described below attached thereto, and a love case 5.

The middle frame 4 is equipped with a rechargeable battery 5' as shown in FIG.
, 5', a motor 6, a step-down transformer 7 for charging,
A cutter mechanism 8 is attached.

The rotatable cutter holder 9, which is the main part of the cutter mechanism 8, is provided with conical pencil insertion holes 1 and 0, and inside these holes there are decorations shown in the drawing 11, and a gap that communicates when the plate is slid. The pencil inserted through the insertion hole 12 is the cutter blade 1.
It is designed to be cut at 3.

A tip detection rod 15 is slidably inserted into the cutter holder 9 and is lowered via a detection plate 14 by the tip of a pencil being sharpened.

An open recessed chamber 16 is provided at the lower part of the middle frame 4 in which a gear group 15 for transmitting rotational power from the motor 6 to the cutter holder 9 is housed.

Reference numeral 17 denotes a fixed base plate made of synthetic resin having a shape that matches the opening on the lower surface of the opening recessed chamber 16, on which a switch case and a core tip length adjustment rotary plate, which will be described later, are attached. An insertion hole 18 through which the detection rod 15 is inserted is formed, and a ring-shaped wall 19 surrounding the insertion hole 18 is provided.

20 is a pivot shaft 21 at one end of the fixed base plate 17.
．． The switch case is pivotably mounted at 21, and a pair of switch contacts, that is, a movable contact piece 22 is located at the upper side and a fixed contact piece 23 is located at the lower side.

Also, the lower end of the tip detection rod 15 enters into the movable contact piece 2.
A through hole 24 facing the insertion hole 18 on the board 17 side is formed in the upper part of the switch case 20 so that the switch case 2 can be pushed down. Stopper protrusions 25, 25 are provided to prevent excessive tilting, and a protrusion 27 for engaging and placing a core tip length adjusting rotary plate 26, which will be described later, is provided at the tip.

Next, to explain how to attach the switch case 20 to the fixed board 17, the fixed board 17 has L-shaped support pieces 2B and 28 protruding downward from the straight end of the fixed board 17. The pivots 21, 21 of the switch case 20 are fitted into the support pieces 28, 28, and are temporarily placed in a pivoting state.

At the same time, the protruding rods 25, 25 for the stopper on the central side of the switch case 20 are also provided with downward L-shaped receiving pieces that protrude oppositely from the back side of the board so as to sandwich the insertion hole 18. 29 and 29 in an engaging relationship (see FIG. 5).

On the other hand, on the front side of the fixed substrate 17, a core tip length adjustment rotary plate 26 having the shape shown in the figure is mounted so as to be horizontally rotatable left and right.

A circular hole portion 30 that is slidably fitted into the ring-shaped wall 19 is formed in a substantially central portion of the rotating plate 26, and
A substantially rectangular window hole 32 is formed in the bent portion 31 at the end,
The switch case 20 is attached to the step-like step portions 33, 33', 33'' where the space between the steps at the lower edge of the window hole is an inclined surface.
The protrusion 27 at the tip is engaged and placed, and its position can be changed by horizontally rotating the rotating plate 26, and the degree of tilting can be changed by the weight of the entire switch case 20.

Next, the coverage force of the rotary plate 26 on the fixed substrate 17 will be explained.

That is, a sector-shaped opening 3 is provided at the arc side end 17' of the fixed substrate 17.
4 is formed, and the bent portion 31 of the rotating plate 26 can be inserted diagonally from above into this opening 34 and removed downwardly, and at the same time, holes are formed on both sides of the ring-shaped wall 19. Engagement hole 3
5 and 35, and engage the rotation plate mounting claw pieces 36 and 36.

Therefore, the rotary plate 26 is attached to the base plate 17 so as to be rotatable left and right by the circular hole 30 on the rotary plate 26 side that fits into the ring-shaped wall 19.

When installed, the dowel 38 at the end of the spring piece 37 extending on the opposite side of the bent portion 31 engages and disengages from the chevron-shaped articulating protrusion 39 provided on the board 17 and clicks into the rotating plate 26. It is designed to make motion work.

Reference numeral 40 denotes an operation legitimate child portion provided at the lower end of the bending portion 31.

In this way, the switch case 20 is placed on the back side of the fixed board 17.
is attached so that it can be tilted freely, and a core tip length adjustment rotary plate 26 is attached to the front side so that it can be rotated horizontally in the left and right directions, and each can be attached and made into a unit without using fixing parts such as screws. The first component is assembled.

Next, the fixed substrate 17 is attached to the lower opening of the open recessed chamber 16, and this coverage is also unique.

This will be explained next. Arc side end 4 of the open recessed chamber 16
1 has a projecting edge 42 projecting horizontally inward, and two bosses 43 and 43 are provided at the other end of the open recessed chamber 16.

Therefore, for attachment, the side edge 17' of the arcuate end of the fixed base plate 17 is engaged so as to rest on the ridge 42.

(See FIG. 2), and two screws 44, 44 are fastened to the bosses 43, 43 at the other end of the board 17, respectively.

Therefore, the board 17 can be attached to the lower surface of the open recessed chamber 16 without using many screws 44, 44, and the number of parts can be reduced and work can be made easier.

Then, when installing the board 17, the pivot 2 of the switch case 20
The intermediate hanging wall 45 on the middle frame 4 side comes into contact with the opening side of the L-shaped support pieces 2B and 28 that temporarily pivot the shaft 21.21, as shown in Fig. 2, to prevent the pivot shaft 21.21 from coming off. It is in a completely pivoted state.

The inner frame 4 with the fixed board 17 attached in this way is attached to the main body cover 2.
Finally, the bottom cover 3 that closes the bottom opening 2' is attached with screws 49 to complete the entire assembly.

As mentioned above, in this invention, in which the lead tip detection mechanism is skillfully incorporated in the narrow opening recessed chamber 16 in which the gear 15 is housed, the operation during actual pencil sharpening will be explained. When the switch is held horizontally, the tip length adjustment rotating plate 26 is rotated to the leftmost side with its operating knob 40, and the protrusion 27 at the tip of the switch case is aligned with the opening step. Among them, it is engaged and placed on the topmost step portion 33 as shown in FIG. 6a.

Now, when the decorative plate 11 is slid and a pencil is inserted into the cutter holder 9 from the pencil insertion port 12, the drive switch S1 is turned on and the rotation of the motor 6 is reduced by the gear group 15, and the cutter holder 9 is moved at a predetermined speed. Rotate with.

When the pencil is sharpened by the cutter blade 13 and a lead tip is formed, the detection plate 14 is lowered by the lead tip, and subsequently the lead tip detection rod 15 is lowered.

The amount of descent of the detection rod 15 is proportional to the amount of the tip formed, and the tip detection rod 15 enters through the through hole 24 of the switch case 20 and has its lower end abutted against the movable contact piece 22. Start pressing down on 22.

When the tip detection rod 15 is lowered further in this manner, the movable contact piece 22 finally comes into contact with the fixed contact piece 23.

Then, this contact turns on the switch S2, and the indicator lamp 47 consisting of an LED lights up, indicating that the tip of the lead has been cut.

A stopper 48 is provided inside the switch case 20, so that after the movable contact piece 22 hits this stopper, it is prevented from moving any further down, thereby preventing excessive cutting.

In this case, a relatively thick and short core tip is formed.

Next, if you want to make the tip a little thinner and longer, rotate the heir 40 to the right.

Then, the stepped portion shifts, so that it comes to rest on the stepped portion 33' in the middle of the protrusion 27 at the tip of the switch case, as shown in FIG. 6, and is engaged and placed thereon.

As a result, the entire switch case 20 due to its own weight,
It is tilted downward by a distance of 11 with the pivot 21.21 as the fulcrum compared to the previous horizontal case.

This means that both the tip detection rod 15 and the detection plate 14 are lowered by 11 points than in the previous case, and as a result, even if the tip is scraped, the tip will hit the tip detection plate 14 and push it down. This means that the core tip detection mechanism will not work unless an extra 1□ is removed.

Therefore, after setting in this way, when a pencil is similarly inserted into the cutter holder 9 and begins cutting, the point in time when the lead tip detection rod 15 is pushed down via the lead tip detection plate 14 is earlier than in the previous case when the lead tip is formed. This occurs when the length increases by 11, and the movable contact piece 22 is pushed down by the detection rod 15 and comes into contact with the fixed contact piece 23, and the indicator lamp 47 lights up to notify the completion of cutting.

If you want to carve thinner and longer, rotate the heir 40 further to the right.

In this way, the protrusion 27 is located at the lowest step 33'' of the steps.
is in the engaged position as shown in FIG. 6C.

Then, the switch case 20 is tilted as a whole so as to be lowered by a distance 12, which is longer than the previous one 11.

Therefore, in this case, the detection rod 15 will not be lowered via the lead tip detection plate 14 unless the pencil lead tip is formed 1 square more than in the first state.

Therefore, in this case, the timing at which the movable contact piece 22 contacts the fixed contact piece 23 and the lamp 47 lights up is further delayed, and in the end, the tip of the tip is cut long and thin.

In this way, the length of the lead tip can be changed freely, so even if the same pencil is used, it depends on the person using it. For example, an adult may be able to use a thinner or longer lead, but a child may break the lead, so in this case, It is easier to use by making it a little shorter and thicker, and depending on the hardness of the lead, for example, if the tip of a soft lead such as a colored pencil is too long, it will break easily, so it should be made to be a short lead to make it easier to use. I can do it.

As mentioned above, if it is attempted to equip a small pencil type such as a battery-powered one with a lead length adjustment mechanism, it may not be possible to incorporate it properly due to storage space problems, and there is a risk that assembly will be complicated.

However, the present invention solves the above problems and makes it possible to easily incorporate this adjustment mechanism.

Namely 1. - An open recessed chamber in which a group of gears is housed is provided on the bottom surface of the inner frame where the motor, cutter mechanism, etc. are installed, and this recessed chamber is used to store the tip length adjustment mechanism. A fixed base plate having a shape that matches the lower opening of the concave chamber is provided, and a pair of switch contacts operated by a tip detection rod that is vertically slidably inserted into the cutter mechanism is installed on the back side of the fixed base plate. The inserted switch case is pivoted so that it can be tilted freely, and a tip length adjustment rotating plate is rotatably mounted on the front side of the board. The mounting on the board can be done without using any screw parts, and is made into one unitized component.

In order to attach this to the lower opening of the open recessed chamber, one side edge of the board is hooked onto the inward protruding edge formed on the one side mouth edge of the recessed chamber, and only the other side of the board is screwed. It can be easily attached by screwing it to the boss in the recessed chamber.

Therefore, assembly work is easy.

Furthermore, to describe the characteristics of the attachment of the switch case and the core tip length adjustment rotary plate to the fixed board, the switch case has a pair of pivots provided at its base end, and a pair of pivots protruding from the back side of the board. Just by being fitted into the letter-shaped support piece, it becomes almost pivoted, and the tip length adjustment rotary plate has a pair of mounting claw pieces provided on it that are inserted into a pair of engagement holes provided on the fixed base plate. At the same time, the circular hole formed in the center of the rotary plate fits into the ring-shaped wall of the base plate, so that the rotary plate can be rotatably mounted, making it highly workable.

As described above, it is possible to provide a small electric pencil control device with excellent assembly efficiency and a lead length adjustment mechanism configured with zero parts at a low cost.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is an overall external view, Fig. 2 is a sectional view of the entire structure, and Fig. 3 is an exploded perspective view of the main body, tip length adjustment mechanism parts, and low lid. , Fig. 4 is an exploded perspective view of the entire component, Fig. 5 is a structural side view showing the pivoting relationship between the fixed board and the switch case, Fig. 6 shows the mechanism for adjusting the core tip, and Fig. a is Figure B shows the case where the lead tip is made thicker and shorter, Figure B shows the case where the lead tip is made thinner and longer, and Figure C shows the case where it is made the thinnest and longer. Figure 7 is an electric circuit diagram. 5'...Battery, 6...Motor, 15
・Curve/core tip detection rod, 8...Cutter mechanism, 4.
Song/middle frame, 15...Gear, 16...
Opening concave chamber, 17...Curved fixed board, 22, 23...
・Switch contact piece, 2o...Curved switch case, 26...
... Core tip length adjustment rotary plate, 42 ... Protrusion e!
, 43.43・Song・Boss, 2・・Song body cover, 3・・
・・・・Bottom cover, 28, 2 Curved L-shaped support piece, 2
1, 21... Pivot, 18... Insertion hole, 19... Ring-shaped wall, 35, 35...
・Pair of engagement holes, 36, 36...Pair of mounting claws, 3o...Curved central circular hole, 27...Protrusion,
32...Window hole, 33.33', 33''...
...stepped lower border.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. An opening recessed chamber in which a gear is stored is provided on the lower surface of an inner frame equipped with a motor and a cutter mechanism into which a tip detection rod can be inserted, and the opening recessed chamber matches the lower opening of this recessed chamber. One end of a switch case, in which a pair of switch contacts operated by the tip detection rod is inserted, is pivotally attached to the back side of a fixed board made of synthetic resin having a shape of A tip length adjustment rotary plate that locks the tip and changes the locking position by external operation to change the tilting degree of the switch case is installed, and one side edge of the substrate is connected to one side mouth edge of the recessed chamber. An electric pencil control device that engages with an inward protruding edge forming a number and fastens the other end of the substrate to a boss in the recessed chamber. 2 A pair of L-shaped support pieces are provided protruding from one end of the back side of the fixed board, and a pair of pivots provided at one end of the switch case are fitted into the support pieces, so that a pair of pivots provided at one end of the switch case are fitted into the support pieces, and a pair of pivots provided at one end of the switch case are fitted into the support pieces. A ring-shaped wall is formed in the husband to surround the insertion hole of the tip detection rod, and a pair of engagement holes bored on the outer substrate of the ring-shaped wall are provided with the tip length adjustment rotation. A pair of mounting claws provided on the plate are engaged, and the central circular hole of the rotating plate is slidably fitted into the ring-shaped wall, and the protrusion at the tip of the switch case is engaged with the rotating plate. The electric pencil control device according to claim 1, wherein the electric pencil control device is engaged with and placed on the stepped lower edge of a window hole formed at the end of the plate.