JPS647409Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement of a counter used as an integration counter.

[Prior art]

For example, in electrical equipment such as copying machines, machine tools, and other various equipment and devices,
It is common practice to display numerical values such as the frequency of use and operating hours of the equipment using an integration counter, which plays an important role in determining usage costs, maintenance, and inspection timing of the equipment. .

By the way, in this type of counter, a return-to-zero mechanism, which is attached to normal counters, is generally used to prevent the device user from intentionally or accidentally canceling the counted value during counting. I haven't. Further, even if a zero return mechanism is provided, it is designed to operate only under special conditions and to prevent the user from operating it.

On the other hand, in this type of counter, the counter structure is housed inside the casing and taken out from the casing to prevent the user from canceling the counted value by operating any part other than the zero return mechanism (internal mechanism). It is also possible to configure the system so that it is not possible to do so. For this reason, it is conceivable to engage and attach a member to prevent removal to the counter structure housed in the casing, but in order to attach this type of member to the casing and counter structure, a partial change in the structure is required. This is inevitable, and space is also needed. For this reason, there is a demand for a structure that does not change the structure or increase the space, but an overly simple structure cannot fulfill the function of preventing the counter from being taken out, and it is difficult to satisfy both. The reality is that it is difficult.

[Summary of the idea]

This invention utilizes the hollow hole in the distance rod of the counter frame, forms a through hole in the wall of the casing facing the distance rod, and inserts a pin into the hollow hole of the distance rod through this through hole. By configuring it so that it can be press-fitted, there is no need to perform any processing on the counter structure side, and it is sufficient to simply form a system of through holes on the casing side. A counter removal prevention structure can be constructed simply by press-fitting into a hole, thereby providing a counter that can reliably prevent counter removal without significantly changing the structure or securing extra space. It's about doing.

〔Example〕

Figures 1 to 3 are overall configuration diagrams of the counter of the present invention, with Figure 1 being a partially exploded perspective view and Figure 2 being a partially exploded perspective view.
3 are a plan view and a cutaway side view. In these figures, a counter 1 includes a base 2 integrally molded from a synthetic resin material and configured into a roughly flat plate shape, and a frame 3 formed by bending a metal material into a U-shape in plan.
The base 2 and frame 3 are integrally combined and fitted to form a housing.
The base 2 has a plurality of engagement pieces 4 with the frame 3, a shaft support portion 5 for a zero return lever (described later), a push button support groove 6, a bullet cam support rod 7, a contact bullet support groove 8, and other protrusions. It forms a hole. The frame 3 has side walls 3a, 3a and a rear wall 3b, and includes an engagement hole 9 that fits into the engagement piece 4 of the base 2 to integrate the base 2 and the frame 3, a shaft support hole 10, 11 and armature support hole 1
2. Various holes are formed.

A main shaft 13 is supported at both ends in the one shaft support hole 10, and a number wheel group 1 consisting of a plurality of number wheels (seven in this example) is mounted on the main shaft 13.
4 are coaxially mounted. The number wheel group 14 has numbers "0" to "9" written on its circumferential surface in the circumferential direction, and a heart cam 15 is integrally formed on one side thereof. The other number wheels except for the number wheel 16 of the lowest digit on the right side of the figure, that is, the number wheel 17 of the most significant digit on the left side of the figure and the other intermediate number wheels 18, are provided with pin gears 19 on the other side, and pin gears 19 are provided on the other side. High number car 17
A segment gear 20 is provided on a part of the circumference on one side of the other numbered wheels 16 and 18. Furthermore, a ratchet gear 21 is integrally formed on the other side of the lowest numbered wheel 16, and an arc-shaped projection 2 is formed on one side of the highest numbered wheel 17 and on a part of the circumference corresponding to the displayed number "9".
2 protrudes in the axial direction. In addition, main shaft 1
3 has a spring 23 between it and the frame side wall 3a.
A washer 24 is mounted on the shaft, and the shaft position of the number wheel group 14 is regulated by this biasing force.

A zero return lever 25 having a generally U-shape and biased clockwise by a spring 52 is disposed at the rear of the numerical wheel group 14, and support shafts 26 protruding from both ends of the lever 25 are connected to the respective shafts. By fitting into the support portion 5, the zero return lever 25 is supported on the base 2 so as to be swingable in the vertical direction. A pinion shaft 27 is supported at both ends of the zero return lever 25, and a plurality of shift pinions 28 (six in this example) are pivotally supported on the pinion shaft 27. Needless to say, these shift pinions 28 are interposed between the number wheels 14, and mesh with the opposing pin gears 19 and segment gears 20 to perform a known shift operation. Further, on the front surface of the zero return lever 25, seven pressing pieces 29 corresponding to the heart cams of each number wheel group 14 are juxtaposed and protruded. Further, at the other end of the zero return lever 25, a pole drive lever 30 having a sliding pin 31 fixed to its tip is provided to protrude upward.

On the other hand, a spool 32 is fixed to the rear wall 3b of the frame 3 at its base end with screws or the like. This spool 32 has a core 33 at the central axis position, and a winding 34 made of thin wire is arranged around the spool 32 to form an electromagnetic structure. A circuit board 35 is integrally fixed to the side of the base end 32a of this spool 32. Components such as a reed switch 36 and a diode 37 are attached to the circuit board 35.
In particular, the reed switch 36 is connected to the window 35a of the circuit board 35.
The contact is turned on by the excitation force in the winding 34. Furthermore, this spool 3
One end of an armature 38 made of a piece of ferromagnetic material is supported in the armature support hole 9 at the front position of 2, and the tip 38a of the armature 38 is biased by the biasing force of a spring 39 by the electromagnetic force when the winding 34 is energized. It is adsorbed and moved backward (to the left in the figure) against the force. Spring 39 is section 3 of armature 38
8b and the section 3c of the frame 3.

In addition, other shaft support holes 1 of the frame 3
1 supports a pole shaft 40, and a pole 41 is loosely inserted therein. This pole 41 is the fourth
As shown in the figure, it is formed into a roughly U-shape, and at its upper and lower ends there are ratchet pawls 41 that alternately mesh with the ratchet gear 21 of the lowest numeral wheel 16.
a and 41b are integrally formed, and the lower side of the shaft support has a slightly larger engagement hole 41c into which the tip of the armature 38 is inserted and engaged. Therefore, when the armature 38 is reciprocated at its tip 38a in the front-back direction by the excitation force of the winding 34, the tip of the pole 41 is thereby reciprocated up and down, and the upper and lower ratchet claws 41a, 41
b sequentially meshes with the ratchet gear 21 to rotate it step by step in the direction of the arrow shown in the figure together with the lowest numbered wheel 16. Furthermore, a tapered groove 41d is formed on the upper side of the pawl 41, and engages the sliding pin 31 of the pawl drive lever 30 of the zero return lever 25. Due to this engagement relationship, when the zero return lever 25 is reset, the pawl 41 is slightly rotated clockwise in the drawing by the pawl drive lever 30, and the ratchet pawls 41a and 41b are respectively disengaged from the ratchet gear 21. The least significant number wheel 16 is placed in a free state to enable its return to zero.

On the other hand, at the front left end of the base 2, there is provided a push button structure 42 for reset supported by the push button support groove 6 and the like. As shown in an enlarged view in FIG. 5, this push button structure 42 is moved directly rearward against the force of a spring 51 suspended between it and the frame 3 when it is manually operated (pushing operation). A push button 43 , a push button cam 44 horizontally rotatably supported by a rod portion 43 a erected on the push button 43 , and a push button cam 44 located behind the push button cam 44 whose rear end is a part of the zero return lever 25 . (the end of the pinion shaft 27) and a push button lever 45 engaged with the pinion shaft 27. The push button 43 is integrally formed with an engaging protrusion 43b that fits into the push button support groove 6 and a bullet cam operating protrusion 43c on the right side of the drawing, and a cam spring 46 fitted into the rod portion 43a allows the push button cam 44 Rotate in the counterclockwise direction shown. However, the push button cam 44 comes into contact with the side wall of the frame and its rotation is restricted. The push button cam 44 is provided with an engaging piece 44a projecting upward, which can engage with the protrusion 22 of the uppermost numeral wheel 17 when the push button cam 44 moves rearward. In addition, push button lever 4
5 is supported by the frame 3 by a pin protrusion 45a protruding from one side, and the push button cam 44 is not engaged with this in its normal rotating position, but is moved in a position in which the push button cam 44 is slightly rotated clockwise. A contact portion 45b that can come into contact with the rear end 44b for the first time is integrally formed. Note that the elongated hole 45c provided in the push button lever 45 is an escape hole for the main shaft 13.

Further, a pair of bullet cams 47 and 48 are inserted vertically into the bullet cam support rod 7 of the base 2, as shown in FIG. , 50 lower tongue piece 49a, 50
a are integrally press-fitted and supported. Then, the other end knob 47a of the upper bullet cam 47 is brought into contact with the front side surface of one end of the front contact strip 49, and the other end knob 48a of the lower bullet cam 48 is brought into contact with the rear contact strip 5.
These bullet cams 47,
48 in the counterclockwise and clockwise directions, contact strips 49 and 50 are brought into contact and conduction with each other at each bent portion. It is assumed that the contact strips 49, 50 are connected to an electric lock circuit (not shown). The upper bullet cam 47 is rotated counterclockwise against the spring force of the contact bullet 49 when the operating protrusion 47b is engaged with the protrusion 22 of the top number wheel 17, and the lower bullet cam 47 is rotated counterclockwise against the spring force of the contact bullet 49. One end of the bullet cam 48 is pushed by the bullet cam operating protrusion 43c of the push button 43, so that the contact bullet 50
The relative positions of the number wheel 17 and the push button 43 are determined so that the number wheel 17 and the push button 43 are rotated clockwise against the spring force.

By the way, in the counter structure constructed as described above, the housing is constructed by integrally fitting the frame 3 and the base 2 as shown in FIGS. 2, 3, and 7, as described above. However, for this fitting, the engagement piece 4 of the base 2 may be fitted into the engagement hole 9 of the frame 3. On the other hand, in order to improve the structural strength of the frame 3,
Holes 60, 60 are formed at the front ends of a, 3a, and both ends of a distance rod 61 are caulked and fixed to these holes 60, 60. This distance rod 61 is hollow at least at both ends and provided with hollow holes 62, 62, but in this example the entire distance rod 61 is hollow. Further, by assembling the frame 3 and the base 2 integrally in this way, the vertical piece 63 of the base 2 shown in FIG. Furthermore,
The vertical pieces 64, 65, etc. in FIG. 1 function as holding pieces for giving moderation to the lead wires 66, 67 connected to the winding 34 and the contact strips 49, 50. In addition,
Lead wire 67 connected to contact strips 49, 50
is extended along the inside of the groove 68 formed on the back surface of the base 2 as shown in FIG. 8, and does not protrude downward from the bottom surface of the base 2. In the figure, 75 is a square hole that fits into the projection 76 of the frame 3.

The counter structure configured as described above can be housed in a container-shaped casing 69 integrally molded from a synthetic resin material, as shown in FIG. This casing 6
Reference numeral 9 has a display window 70 for the number wheel group 14 with a transparent plate attached to its front surface, and an operation window 71 for the push button 43.
Further, attachment pieces 72 for attaching to equipment not shown are integrally formed on the upper and lower outer sides. A through hole 73 is formed on both sides of the casing 69 at a position corresponding to the distance rod 61, and the distance rod 61 can be inserted from the outside of the through hole 73.
As shown in FIG.
This prevents the counter structure from being removed from the casing 69. That is, pin 7
4 is difficult to pull out easily, and it is difficult to take out the counter structure unless the pin 74 is sheared.

According to the above configuration, each time the winding 34 is energized, the electromagnetic structure mainly including the spool 32 is excited and attracts the armature 38, and when the excitation force is removed, the armature 38 is moved back. . Due to the back and forth movement of this armature 38, the tip 3
The entire pawl 41 engaged with the pawl 8a is swung up and down about the pawl shaft 40, and the reciprocating movement of the upper and lower pawls 41a and 41b causes the ratchet gear 21, that is, the lowest numbered wheel 16, to move as is known. Rotate in steps of one number. Then, this rotation is sequentially transmitted to the upper digit number wheels through the cooperation of the segment gear 20, the shift pinion 28, and the pin gear 19, and a so-called digit shift operation is performed to display the cumulative number on the circumference of each number wheel group 14. It will be displayed numerically.

During this time, when the highest number wheel 17 is displaying "8" or less, the protrusion 22 on one side is in a position other than the front, so even if the reset push button 43 is pressed, the cam spring 46 causes the protrusion 22 to hit the wall surface of the frame 3. The push button cam 44 in the normal position does not engage with the protrusion 22, and the push button cam 44 is moved rearward in its normal state, and its rear end is moved to the push button lever 45.
does not pass beside the contact portion 45b and come into contact with it,
Therefore, the push button lever 45 is not operated and zero return operation is not performed. However, when the highest number wheel 17 is displaying "9", the protrusion 22 is moved to the front position, so when the push button cam 44 is moved rearward as the push button 43 is pushed, the engagement piece 44a is moved to the front position. As the push button cam 44 is engaged with the protrusion 22 and prevented from moving in the normal state, the push button cam 44 is rotated slightly clockwise against the force of the spring 46, so that the rear end 44b of the push button cam 44 is slightly displaced laterally. As the push button lever 45 moves in the opposite direction, the rear end 44b comes into contact with the contact portion 45b of the push button lever 45, and is further moved rearward, thereby moving the push button lever 45 backward as a whole. As a result, the zero return lever 25 is rotated counterclockwise, and the shift pinion 28 supported by the shift pinion 28 is retracted from between the number wheels 14 to make the number wheels 14 free, while the zero return lever 25 is rotated counterclockwise. As a result of this rotation, the pressing piece 29 comes into contact with the heart cam 15 and is forcibly rotated by the well-known heart cam operation, thereby returning the number wheel group 14 to zero.

At this time, as the zero return lever 25 rotates, the sliding contact pin 31 of the pole drive lever 30 moves toward the pole 4.
The pawl 41 is slightly rotated clockwise by engaging with the taper groove 41d surface of the pawl 41 to disengage the pawls 41a and 41b from the ratchet gear 21. The wheel 16 is made free to enable the above-described zero return operation of the lowest number wheel 16.

On the other hand, the reed switch 36 on the circuit board 35 is turned on by the excitation of the electromagnet structure, and the counting operation of the counter is sent as an electric signal to a circuit not shown.

Furthermore, when counting continues until the highest number wheel 17 displays "9", the protrusion 22 on one side is positioned forward, so that the upper bullet cam 47
The actuating protrusion 47b is engaged with the protrusion 22, and the strip cam 47 is thereby rotated counterclockwise to actuate the contact strip 49 and turn on the contact. this is,
This signal is used as a predetermined count signal to operate an electric lock circuit (not shown), thereby disabling, for example, a copying machine.

Further, when the above-mentioned zero return operation is performed by the push button 43, one end of the push button 43 is engaged with the bullet cam operating protrusion 43c, and the lower bullet cam 48 is rotated clockwise, thereby operating the contact bullet 50. Turn on the contact and activate the electric lock circuit (not shown) in the same way as above.

Therefore, if this counter is used as an integration counter for a device such as a copying machine, the integrated value will be displayed on the display window 70 as the copying machine operates. and,
Even if the user intentionally removes this counter from the copying machine and tries to change the accumulated value, the counter structure is housed in the casing 69 and the pin 74 is press-fitted through the through hole 73 and the hollow hole 62 of the distance rod 61. Therefore, it is impossible to take out the counter structure from the casing 69, and therefore it is impossible to change the numerical value. In particular, the pin 74 cannot be pulled out because its head is located flush with or inward from the through hole 73, and it is extremely difficult, although not impossible, to shear the pin. In some cases, the casing 69 may be damaged, making this virtually impossible.

On the other hand, even if such a removal prevention structure is provided,
Simply form a through hole 73 in the casing 69 and insert the pin 7.
4 is press-fitted using the hollow hole 62 of the distance rod 61, the structure or processing for preventing removal is extremely simple and does not require any special space.

It should be noted that the present invention is not limited to the above description, and the shape, structure, etc. of each part may be modified or changed as appropriate. For example, the distance rod 61 may have shaft holes formed only at both ends, and these holes may be hollow holes. Alternatively, one long pin 74 may be press-fitted across the entire width of the casing 69.

[Effect of the invention] According to the invention, the through hole provided in the casing,
Since the pin is press-fitted across the hollow hole of the distance rod of the counter structure to prevent the counter structure from being removed, there is no need to perform any processing on the counter structure side, and the casing side is simply made with a through hole. It is only necessary to form the counter, and this brings about effects such as being able to reliably prevent the counter from being taken out without significantly changing the structure or securing extra space.

[Brief explanation of the drawing]

FIG. 1 is a partially exploded perspective view of the counter of the present invention.
Fig. 2 is a plan view of the assembled state, Fig. 3 is a broken side view, Fig. 4 is an enlarged perspective view of the pole section, Fig. 5 is an enlarged perspective view of the push button assembly, and Fig. 6 is an enlarged perspective view of the contact section. , FIG. 7 is a perspective view of the casing in the stored state, and FIG.
The figure is a perspective view seen from below, and FIG. 9 is a front sectional view. 1...Counter, 2...Base, 3...Frame, 14...Number car group, 25...Zero return lever,
28...Shield pinion, 38...Armature, 41...Pole, 43...Push button, 49,50
... Contact bullet, 61 ... Distance rod, 6
2...Hollow hole, 69...Casing, 73...Through hole, 74...Pin.

Claims (1)

[Scope of utility model registration request] A distance assembly comprising a counter structure formed by incorporating various counter parts including a group of multi-digit number wheels into a frame, and a casing fitted to cover the counter structure, and assembling the frame. A through hole is formed in the casing corresponding to the hollow hole provided at both ends of the rod, and a pin material is press-fitted across the through hole and the hollow hole to prevent the counter structure from being removed from the casing. Features a counter.