JP3028310U - Gear device - Google Patents

Abstract

(57) [Abstract] (Correction) [Problem] The crown teeth of a character wheel (crown gear) of a conventional counter and the spur teeth of a pinion (spur gear) form part of the outer edge of the disk end surface of the character wheel. Since the burr with a part of the tooth end surface of the pinion and the oblique surface with the rotation axis collide and cannot smoothly rotate while contacting smoothly, rotation stop, discontinuity between rotation and stop, disengagement in the rotation axis direction, It eliminates the defect that the rotating torque becomes excessive and the number display on the outer peripheral surface of the character wheel becomes impossible and inaccurate. SOLUTION: The tooth end surface of the spur tooth 4 of the pinion is provided with a projection 29 having a smooth arc gradually increasing in the counter-rotational direction of the pinion and projecting in a direction parallel to the tooth end surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The invention relating to this utility model registration application (hereinafter simply referred to as “the invention of the present application”) is such that a part of the outer edge of the disc of the crown gear is always in contact with a part of the end face of the spur gear and The present invention relates to a counter, a so-called counter, in which only one gear rotates by meshing with two crown teeth of a crown gear, and the crown gear is a letter wheel and the spur gear is a pinion.

[0002]

[Prior art]

 In the conventional counter, as shown in FIGS. 1, 2, and 3, when the crown teeth 2 of the character wheel 1 which is a so-called crown gear are engaged with the teeth 4 of the pinion 3 which is a so-called spur gear and are rotated. Since the rotational axes of the character wheel 1 and the pinion 3 are spaced apart and parallel to each other, only one of the plurality of spur teeth 4 of the pinion 3 is engaged with the two crown teeth 2 of the character wheel 1. Further, a part of the tooth end surface 5 of the pinion 3 comes into contact with a part of the outer edge 7 of the end surface 6 of the disc of the character wheel 1 to rotate.

However, the character wheel 1 and the pinion 3 of the conventional mass-produced, inexpensive, and small counter include the outer edge 7 of the character wheel 1 because the melted plastic is injected and molded in two molds. The disk end surface 6 and the tooth end surface 5 of the pinion 3 are not directly intersected with the respective rotation axes, but are obliquely intersected with each other, or a protrusion called a burr is formed.

Therefore, the character wheel 1 and the pinion 3 of the conventional counter must rotate while the slanted surfaces of the outer edge 7 of the disk end surface 6 and the tooth end surface 5 collide with each other and burrs collide with each other smoothly. Therefore, the crown teeth 2 of the character wheel 1 and the spur teeth 4 of the pinion 3 stop rotating, continue to rotate and stop, have excessive rotation torque, and move in the rotation axis direction. Since the meshing is disengaged, it is impossible to display the numeral 9 on the outer peripheral surface 8 of the character wheel 1, which causes an inaccurate defect.

In order to solve the above-mentioned defects of the prior art, conventionally, as shown in FIGS. 4 and 5, the outer edge 10 of the tooth end surface 5 of the spur tooth 4 of the pinion 3 and the tooth contour 11 are smoothly connected. In order to form the circular arc 12, plastic molding was performed using the left and right dies that open and close to the right and left of the line 13 orthogonal to the rotation axis, but the left and right dies have a configuration that forms the arc 12. Therefore, the price is high, and strict precision is required to accurately match the left and right dies on the orthogonal line 13, and the operation is extremely difficult and expensive.

Further, conventionally, as another means for forming the arc 12 of the pinion 3, sandblasting (barrel polishing) or barrel polishing has been used, but these are used in addition to the plastic molding process of the pinion 3. In addition to requiring another step, the shape of the tooth contour 11 and the smooth surface of the tooth end surface 5 were damaged, which hindered engagement and rotation with the character wheel 1.

[0007]

[Problems to be solved by the device]

 The invention of the present application is deficient in the above-mentioned prior art--a counter wheel 1 of a counter, a crown tooth 2 and a spur wheel 4 of a pinion 3, a burr between an outer edge 7 of a disk end surface 6 and a tooth end surface 5, and a rotation axis. Since the slanted surfaces of the two collide with each other and cannot rotate while smoothly contacting each other, rotation stop, discontinuity between rotation and stop or disengagement in the rotation axis direction occurs, and the rotation torque becomes excessive. The purpose is to eliminate the inability to display the number 9 on the outer peripheral surface 8 of the, which makes it inaccurate.

The present invention is characterized in that the following constitution is provided in order to solve the defects of the conventional technique in the counter. “Supported so that it can rotate in one direction around a fixed straight line, and is formed at equal intervals along the outer edge 7 of the disk end face 6 with a flat circular disk that is orthogonal to the rotation axis, and protrudes in parallel with the rotation axis. A crown gear 1 having a plurality of crown teeth 2 is supported rotatably in one direction around a rotation axis that is spaced apart from and parallel to the rotation axis of the crown gear. The tooth end face 5 that contacts a part of the outer edge of the plate end face and the tooth end face 5 that is formed at equal intervals along the outer peripheral surface orthogonal to the tooth end face and is parallel to the rotation axis, and only one is engaged with the two crown teeth of the crown gear. A spur gear 3 having spur gears 4 and a projection 29, 30, 31, 32 having a smooth arc gradually increasing in the counter-rotational direction on the tooth end faces of the spur gears and projecting in the direction parallel to the tooth end faces.

[0009]

【Example】

 A known part of an embodiment of the present invention will be described below with reference to FIGS. Character wheels 1a to 1f, which are crown gears as moving bodies arranged in parallel from one end to the other end in the axial direction, are rotatably fitted to a character wheel shaft 15 which is horizontally fixed inside the frame 14. A number 9 from 0 to 9 is sequentially provided on each of the divided surfaces obtained by dividing the outer peripheral surface 8 into ten equal parts, and one end face of the character wheel 1a at one axial end of each of the character wheels is divided into ten equal parts. A ratchet gear 16 having teeth is fixed, and two gears (not shown) for rotating the model wheel 1b of the next digit by a factor of 1/10 are connected to the other end surface in parallel with the axis. Fix it.

Twenty crown teeth 2 that rotate in association with the forward rotation of the front character wheel are fixed to each one end surface of each character wheel parallel to the axis, and the other end surface of the character wheel is rotated. Two gears (not shown) for rotating the crown teeth 2 of 20 letters of the next digit wheel by 1/10 rotation in synchronization with one rotation are fixed parallel to the axis. The pinion shaft 17, which is fixed inside the frame 1 in parallel with the character wheel shaft 15, is arranged between the character wheels from one end to the other end in the axial direction and is linked to the carry rotations of the next gears. To rotate the character wheel, two spur teeth 2 of each character wheel always mesh with only one of them, and two spur gears that can mesh with each other are provided parallel to the axis, and are always orthogonal to the axis. A pinion 3, which is a spur gear, is rotatably supported so that a part of the end face 5 that contacts the part of an outer edge 7 of the end face on the crown tooth 2 side of each character wheel.

One end of a spiral spring 19 that loosely surrounds the periphery is fixed to the pallet fork 18 which is horizontally fixed inside the frame 14, and the pallet fork 20 is rotatably fitted to the pallet fork. , The tip of the pallet fork 20 has its rotation locus at a position facing the teeth of the ratchet gear 16 of the character wheel 1 and is always separated from the teeth of the ratchet gear 16 so that the other end of the spiral spring 19 is uncoiled. Fix at 20. An armature 23 is vertically movably fitted into a vertical hole 21 formed in the pallet fork 20 and a vertical groove 22 of the frame 1. An iron core 25 fixed to the frame 14 is inserted into a center hole of an electromagnetic coil 24 which is orthogonal to the armature 23 and fixed horizontally inside the frame 14.

The invention of the present application is characterized in that, in addition to the known structures before application as shown in FIGS. 1, 2, and 3, the structure shown in FIGS. 6 and 7 is provided. At the end face 5 of the pinion 3, inside the portion of the contour 26 of the spur tooth 4 that should be engaged with the crown tooth 2 of the character wheel 1, from the remaining portion 27 that leaves a part of the end face 5, rotation in at least one direction. A protrusion 29 having a smooth arc gradually increasing in the direction opposite to the direction 28 and protruding in the direction parallel to the end face 5 and forming a part of a sphere is provided.

Since the present invention has the above-mentioned configuration, the following action is brought about. When the electromagnetic coil 24 is energized by an electric pulse generated in association with one operation of the machine, when the iron core 25 is magnetized, the armature 23 is also magnetized and attracted, and the anchor 20 resists the elasticity of the spiral spring 19. Then, the pallet fork 20 is rotated in one direction about the pallet fork 20, the tip of the pallet fork 20 rotates the ratchet gear 16 of the character wheel 1a by a factor of 20, and when the electric pulse disappears, the electromagnetic coil 24, the iron core 25, The armature 23 is demagnetized, the armature 23 separates from the iron core 26, the pallet fork 20 rotates in the opposite direction about the pallet fork 18 by the elasticity of the spiral spring 19, and the tip of the pallet fork 20 moves the ratchet gear 16 of the character wheel 1a. The character wheel 1a is rotated 1/20 to rotate 1/10 to move the numeral 9 on the next outer peripheral surface 8 to stop, and the generation and disappearance of the electric pulse are repeated. In relation to one rotation of the character wheel 1 with each character wheel operates as in conjunction with pin trunnion 14 and 20 sheets gear 12 therebetween decimal counter (counter).

Further, since the present invention has the peculiar configuration of FIGS. 6 and 7, it also produces the following action. When a part of the tooth end surface 5 of the pinion 3 contacts a part of the outer edge 7 of the disk end surface 6 of the character wheel 1, and one of the spur teeth 4 meshes with two of the crown teeth 2 and rotates with each other. First, since the remaining portion 27 of the tooth end surface 5 comes into contact with a part of the outer edge 7, and immediately thereafter the projection 29 continues to smoothly come into contact with the outer edge 7 from its arc to the top, the pinion 3 and the character wheel 1 Even if the tooth end surface 5 and the outer edge 7 of the are formed so as not to intersect the pinion shaft 17 and the character wheel shaft 15 at an angle, or if there is a protrusion such as a burr, a spherical protrusion having an arc. Since the body 29 smoothly contacts the flat outer edge 7 and the spur teeth 4 surely mesh with the crown teeth 2, both wheels rotate accurately and smoothly and the rotation torque is reduced.

[0015]

[Other Examples]

 As shown in FIGS. 8 and 9, on the tooth end surface 5 of the spur tooth 4 of the pinion 3, the remaining direction 27 from the remaining portion 27 of the tooth end surface 5 which is adjacent to the contour 26 of the spur tooth 4 in the rotational direction 28 and the counter-rotational direction. A flat surface 30 that has a smooth arc and that is similar to the contour 26 of the spur tooth 4 and that projects in parallel with the tooth end surface 5 is formed.

Further, as shown in FIGS. 10 and 11, on the tooth end surface 5 of the spur tooth 4 of the pinion 3, only the protrusion of the spur tooth 4 in the rotational direction 28 and the counter-rotational direction or in the rotational direction. The contour 31 has a smooth arc that gradually increases from the remaining portion 27 of the tooth end surface 5 adjacent to it, and has a claw shape or a semi-claw shape similar to the contour 31 of the protruding portion of the spur tooth 4 and is flat on the tooth end surface. To form a protruding claw shape 32 or a semi-claw shape 33.

[0017]

[Effect of device]

 The present invention comprises the above-mentioned configuration particularly shown in FIGS.

Since the operation described in (1) is produced, the following effects are obtained. Since the protrusions 29 to 32 of the pinion 3 rotate while always smoothly contacting the outer edge 7 of the character wheel 1, the spur teeth 4 of the pinion 3 smoothly mesh with the crown teeth 2 of the character wheel 1 and rotate, Rotation torque is reduced, rotation stop / intermittent rotation / disengagement is eliminated, and the production of pinion 3 is completed in one step of plastic injection molding by the mold, and the other extra steps are unnecessary. Since it is sufficient to use the tooth end surface 5 as a reference, it is simple without requiring high precision.

[Brief description of drawings]

 Fig. 1 Overall perspective view of prior art Fig. 2 Perspective view of gear device of prior art Fig. 3 Side view of Fig. 4 Fig. 4 Plan view of pinion of prior art Fig. 5 Side view of Fig. 4 7 is a plan view of the pinion, FIG. 7 is a side view of FIG. 6, FIG. 8 is a plan view of another embodiment of the present invention, FIG. 9 is a side view of FIG. 8, and is a plan view of another embodiment of the present invention.

[Explanation of symbols]

 1. Character wheel that is a crown gear 2. Crown teeth 3. Pinion which is a spur tooth 4. Spur teeth 5. End facet 6. Disk end face 7. Outer edge 29, 30, 31, 32 Projection body

Claims (4)

[Scope of utility model registration request] 1. A flat circular disc that is rotatably supported in one direction around a fixed straight line and that is formed at equal intervals along the outer edge of the disc end face and that projects in parallel with the rotational axis. A crown gear having a plurality of crown teeth and a rotation axis that is spaced apart from and parallel to the rotation axis of the crown gear, and is rotatably supported in one direction. A tooth end face that contacts a part of the outer edge of the end face,
Spur gears, which are formed at equal intervals along the outer peripheral surface orthogonal to the tooth end faces, are parallel to the rotation axis, and have only one spur gear that meshes with two crown teeth of the crown gear, and the spur gear tooth of the spur gear. A gear unit comprising: a protrusion having a smooth circular arc gradually increasing in a counter-rotational direction on an end face and protruding in a direction parallel to a tooth end face. 2. A spur gear protrusion is formed as a part of a sphere.
The gear device according to claim 1. 3. The gear device according to claim 1, wherein the spur gear has a projection that is a flat surface that projects in parallel with the tooth end face in a shape similar to the entire contour of the spur tooth. 4. The gear device according to claim 1, wherein the projection of the spur gear is a claw-shaped body or a semi-claw-shaped body protruding parallel to the tooth end face in a shape similar to the contour of the projection of the spur tooth. .