JPS5831241Y2 - counting device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improved structure of a counting device that displays, for example, the distance traveled by a vehicle by rotating from the lower digits to the higher digits. The object of this invention is to eliminate irregularities in numerical values during carry operations and to reliably perform carry accumulation operations on character wheels.

Generally, although not shown in the drawings, the above-mentioned counting device has a plurality of character wheels mounted on a shaft installed in a frame, and carries up from the character wheel of the lowest digit to the higher digits sequentially via a pinion gear. It is composed of

By the way, due to the backlash caused by the meshing between the gear formed on each character wheel and the pinion gear, there is a backlash between each character wheel when meshing by the amount of backlash, and the numerical positions of the character wheels after carrying are uneven, causing the displayed value to be uneven. This led to a misunderstanding.

The present invention solves the above problems, and one embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

1 to 5, 1 is a frame bent into a U-shape, 2 is a shaft installed on the frame 1, 3, 3
A, 3B, 3C are the character wheels inserted into the shaft 2, 4,
4A and 4B indicate respective holders interposed between the character wheels 3A, 3B and 3C and fixed to the frame 1 side.

Further, the character wheel 3 of the lowest digit has a cylindrical wheel 5 whose lower digit side is closed and a transmission gear 6 for transmitting rotation from a drive source (not shown) is formed on the side surface of the lower digit side. A pin 7.8 is attached to the inner side surface of the upper digit side of the shaped wheel 5.
is formed.

In addition, the character wheels 3A and 3B except for the least significant digit character wheel 3.

3C has cylindrical wheels 5A, 5B, 5C whose lower girder side is closed and ratchet gears 9.9A, 9B are formed on the side surface of the lower girder side, as shown in FIG. Pins 7A, 7B, 7C, 8A are attached to the inner side surface of the upper digit side of the shaped wheels 5A, 5B, 5C.

8B and 8C are formed.

In addition, the holders 4.4A, 4B are connected to the cylinder 11, from the plates 10.10A, 10B, as shown in FIG. 4a, l).
11A, 11B are formed protrudingly, and the cylindrical bodies 11, 11A,
Ratchet teeth 12, 12A, 12B on the inner peripheral surface of 11B.
are formed, one ratchet tooth portion 12, 12A,
One shift gear 13.13A, 1 adjacent to 12B
3B is formed.

Further, each claw piece 14 is pivotally attached to one pin 7.7A, 7B formed on the character wheels 3, 3A, 3B.
An elongated hole 14A is formed at approximately the center of the hole 14A, and an engaging portion 14B is formed on the tip side thereof, and a tapered surface 14C and an arcuate surface 14D are formed on the outer wall surface continuous with the engaging portion 14B. Recessed surfaces 14E are formed near the pins 7.7A and 7B.

Further, each spring 15 is pivotally attached to the other pins 8, 8A, 8B, and the tip end side of one piece of the spring 15 is bent to form a bent portion 15A, and the bent portion 15A is connected to the above-mentioned nail. It is inserted into the elongated hole 14A of the piece 14 and locked.

Further, the other piece of the spring 15 has its tip bent to form a resilient portion 15B, which is attached to the holders 4, 4A.

Cylindrical body 11, 11A formed in 4B, ratchet tooth portion 12, 12A, 1:1 of 11B and cylinder body 11.11A,
The elastic portion 15B of the spring 150 is engaged with the inner circumferential surface of the counter 11B to constitute a counting device.

In addition, the ratchet gears 9, 9A, 9B formed on the character wheels 3A, 3B, 3C and the holders 4, 4A.

Ratchet teeth 12, 12A formed on 4B.

The number of teeth 12B is the same as the number of numbers or letters printed on each of the cylindrical wheels 5, 5A, 5B, and 5C of the character wheels 3, 3A, 3B, and 3C.

The operation of the above configuration will be explained mainly with reference to FIG.

First, in the forward rotation direction (fifth direction) from the rotational drive source (not shown).
The rotation in the direction of the solid arrow in Figure a) is transmitted to the transmission gear 6 formed on the character wheel 3 of the lowest digit, and the cylindrical wheel 5 rotates around the shaft 2. The positions of the pins 7 and 8 protruding from the upper digit side of the shaft 2 also move along a rotation locus around the shaft 2.

Therefore, the spring 15 pivotally connected to the pin 8 is
The resilient part 15B formed at the tip of the other piece slides over the inclined surface a of the ratchet tooth part 12 of the fixed side of the holder 4, and falls into the inner circumferential surface of the cylindrical body 11 of the holder 4. It moves elastically with its repeated movements.

Also, a bent portion 15 formed at the tip of one piece of the spring 15
A is inserted into the elongated hole 14A of the claw piece 14, and due to the elastic force of the spring 15, the claw piece 14 is pressed against the inner circumferential surface of the cylinder 11 formed in the holder 4, using the pin 7 as a fulcrum, thereby forming the character. As the wheel 3 rotates, a portion of the arcuate surface 14Di and the tapered surface 14C of the claw piece 14 slide into contact with the tip of each ratchet tooth portion 12 of the holder 4 due to the elastic force of the spring 15. .

During this sliding movement, the retaining portion 14 of the claw piece 14
B rotates with the rotation of the character wheel 3 without meshing with the ratchet gear 9 of the character wheel 3A located at the next higher digit than the character wheel 3.

By the way, as shown in FIG. 5, when the claw piece 14 moves to the position of the shift gear 13 formed on the holder 4 as the character wheel 3 rotates, the claw piece 14 moves to the position of the shift gear 13 formed on the holder 4.
The tapered surface 14C of the claw 14 contacts the long hole 14 of the claw piece 14 first.
Against the force of the spring 15 inserted in A, the claw piece 14 rotates with the pin 8 as a fulcrum as the tapered surface 14C of the claw piece 14 comes into sliding contact with the shift gear 13. As the pawl piece 14 rotates, the retaining portion 14B of the pawl piece 14 gradually approaches the ratchet gear 9 formed on the character wheel 3A.

Furthermore, as shown in FIG.
At the same time as the sliding contact with C changes from the flat state to the arcuate surface 14D and is in sliding contact, the retaining portion 14B of the claw piece 14 engages with the ratchet gear 9 and slides on the arcuate surface 14D. During the
The engaging portion 14B remains engaged with the ratchet gear 9, and as the character wheel 3 rotates, the engaging portion 14B engages the character wheel 9A on the next higher digit side.
are linked and rotated.

Next, as shown in FIG. 5e, when the position of sliding contact with the shift gear 13 shifts from the arcuate surface 14D position to the recessed surface 14E, the claw piece 14 is moved into the holder with the pin 8 as a fulcrum by the bending force of the spring 15. 4, the engagement portion 14B of the claw piece 14 and the ratchet toggle 9 are disengaged from each other. When the match is broken, the character wheel 30 revolutions stop rotating to the character wheel 3A located at the next higher digit.

,,,. That is, while the circular arc surface 14D of the claw piece 14 disposed on the character wheel 3 side is in abutting and sliding contact with the shift gear 13 formed on the holder 4, the claw piece 1
The retaining portion 14B formed at 4 engages with the ratchet gear 9 formed at the character wheel 3A of the next digit and rotates to move from the character wheel 3 of the lower digit to the character wheel 3 positioned on the next higher digit side. A carry operation is performed sequentially to 3A.

Therefore, during the carry-up operation, as described above, the resilient part 15 formed at the tip of the other piece of the spring 15
B is the ratchet of the holder 4) While sliding on the inclined surface a of the toothed portion 12, the inner peripheral surface of the cylinder 11 is in a resilient state and falls down, and the numbers formed on each character wheel 3° 3A, 3B, 3C Each character wheel 3, 3A is arranged so as to match the position.

After the carry operation of 3B and 3C, each character wheel 3 and 3A.

The numerical positions of 3B and 3C can be aligned on the axis line of axis 2, and the displayed value of the counting device can be accurately grasped without fear of misunderstanding.

Further, when the rotational direction of the rotational drive source is forward rotation, the transmission gear 6 formed on the character wheel 3 of the lowest digit moves in the reverse direction C (in the direction of the thin arrow) as shown in FIG. 5a.

It is transmitted as a rotation.

However, as clearly shown in FIG. 5a, the ratchet tooth portion 1.2 is formed on the holder 4 with a resilient portion 15B located on the tip side of the other side of the spring 15 disposed on the character wheel 3 side.
The character wheel 3 side and the 1st hole 4 side are locked, and reverse rotation from the drive source side 1 is prevented.

□□・Therefore, by forming a one-way clutch mechanism (not shown) between the drive source side and the character wheel 3 of the lowest digit, it can be applied as a reversal prevention mechanism of a counting device.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention; Fig. 1 is a front view thereof, Fig. 2 is an exploded perspective view of the main parts, and Fig. 3 a and l) are right and left side views of the character wheel. Figures 4a and 4b are right and left side views of the holder, and Figures 5a, b, c, d, and e.
2 is an operational sectional view of the main parts as seen from the direction of the arrow A-A in FIG. 1. FIG. 1... Frame, 2... Axis, 3, 3A, 3B, 3C
... Letter wheel, 4.4A, 4B, 4C... Holder, 5゜5A, 5B, 5C... Cylindrical wheel, 6...
・Transmission gear? , 7A, 7B, 7C, 8, 8A, 8B,
8C... Pin, 9.9A, 9B... Ratchet gear, 10° 10A, IOB... Plate, 11, 11A
, 11B... Cylindrical body, 12, 12A, 12B... Ratchet tooth portion, 14... Claw piece, 13, 13A, 13B...
...Gear for digit feeding, 14A...Elongated hole, 14B...Engaging portion, 14C...Tapered surface, 14D...Circular surface, 1
4E...Concave surface, 15...Spring, 15A...Bending part, 15B...Ejecting part.

Claims (1)

[Scope of utility model registration request] Multiple letter wheels are inserted and formed on the shaft installed in the frame,
In a counting device in which a carry operation is carried out sequentially from the character wheel on the lower digit side to the upper digit side, the least significant digit character wheel of each of the character wheels mentioned above is composed of a cylindrical wheel whose lower digit side is closed and the wheel. A transmission gear for transmitting the rotation from the drive source is formed on the side surface of the lower digit side of the cylindrical wheel, and two pins are erected on the inner side surface of the cylindrical wheel located on the upper digit side. The character wheels of the upper digits except for each have a cylindrical wheel whose lower digit side is closed, a ratchet gear is formed on the side surface of each wheel on the lower digit side, and an inner side surface of each wheel is located on the upper digit side. Two pins are provided upright, and a holder is interposed between each of the character wheels, and the holder has a cylindrical body protruding from the plate, and ratchet teeth are formed on the inner peripheral surface of the cylindrical body. forming one digit feeding gear adjacent to one,
The cylindrical body of the holder is housed inside the cylindrical wheel of the character wheel, and a claw piece is rotatably pivoted to one pin formed on each character wheel, and a claw piece is rotatably attached to one pin formed on each of the character wheels. In addition to forming an elongated hole, an engaging portion, an outer wall surface continuous with the engaging portion, and an arcuate surface are formed on the tip side of the claw piece, and a recessed surface is further formed at a position near the one of the pins following the arcuate surface. A spring is pivotally attached to the other pin, the tip side of one piece of the spring is bent to form a bent part, and the bent part is inserted into the elongated hole of the claw piece. A claw piece is elastically installed in the ratchet tooth portion of the cylinder formed in the holder, and the other piece of the upper spring is bent at its tip to form a resilient part, and the cylinder formed in the holder is 1. A counting device characterized in that an elastic portion of the spring is elastically formed on the ratchet tooth portion and the inner circumferential surface of the cylindrical body.