JPH0746052Y2 - Fixed position detection mechanism of output coupler in motor deceleration mechanism - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a speed reduction mechanism of a motor used in, for example, a copying machine, and more specifically, it uses a rotation of an output gear (link disk) to perform a fixed position 2 A switching mechanism that can detect the ON / OFF state of the circuit, a fixed position detection mechanism that detects which side of the long hole of the link disk is located, and a top and bottom case that houses the motor and the reduction gear train. The present invention relates to a motor deceleration mechanism including a latching mechanism that facilitates assembly.

(Problems to be Solved by Conventional Techniques and Inventions) Conventionally, a motor deceleration mechanism including a motor, a deceleration gear train, and a case for accommodating the motor has a structure in which the upper and lower cases are connected and fixed at a plurality of positions with screws or the like. Therefore, it has been pointed out that the workability in assembling and disassembling and repairing the equipment is poor, and the manufacturing cost is high. Further, when the output of the deceleration mechanism of such a motor is used by connecting it to an external mechanism, it is used by being connected to, for example, a paper feeding mechanism of a cut sheet feeder of a copying machine. In this case, the paper feeding mechanism is used. It is necessary to immediately and automatically determine the timing position of the paper feed mechanism when performing repair work when it is locked inadvertently, but a simple means is required to enable this. It had been.

The present invention was devised to solve such a problem, and can realize the rotation stop position of the output end of the reduction mechanism by a simple means, and at the same time, the upper and lower cases for accommodating the motor and the reduction gear train can be realized. An object of the present invention is to provide a speed reduction mechanism for a motor that facilitates assembly.

(Means for Solving the Problems) According to the present invention, a reduction mechanism including a motor and a reduction gear train, a switching mechanism for detecting a position by contact between a convex cam and a switch, and a reduction gear are provided in upper and lower cases. In a motor deceleration mechanism including a mechanism for connecting an output of a row to an external mechanism via an output connector, an outer peripheral portion of a rotation shaft of an output gear at the end of the deceleration gear row is axially and symmetrically formed. Cams having substantially the same convex and short lengths are formed at the following positions, and the elastic plates at both positions contacting the cams are fixed to the case. A contact plate having a contact portion that contacts the elastic plate, the long cam contacts both elastic plates twice in one rotation, and that contacts the elastic plate when the elastic plate is not in contact with the cam. And fixed to the case, the cam and elastic plate And a contact mechanism of a contact plate.

Further, in the speed reduction mechanism of the motor, a link disk having an elongated hole portion at the outer peripheral edge is provided coaxially with the output gear at the end of the reduction gear train, and the outer circumference of the rotation shaft of the output gear is axially and A cam having substantially the same convex and short lengths is formed at symmetrical positions, and the long hole portion of the link disc and the short output gear cam are fitted at the same position and abutted on the cam. One elastic plate and one contact plate are fixed inside the case, and the long hole stops when the output gear and the link disk rotate through the deceleration gear row and stops at the motor side and the non-motor side. In this fixed position detection mechanism, the long and short cams come into contact with the two elastic plates and the long hole is located on the motor side when there is no short circuit in the OFF state and the long cam contacts one elastic plate. The short cam is in contact with the other elastic plate, but the short cam is in the ON state. In the case of a short circuit, the long hole is located on the side opposite to the motor, and the fixed position detection mechanism detects that the long hole of the link disk is located in either side. .

In the motor deceleration mechanism described above, the elastic plates that come into contact with the cams of the output gears are the motor starting elastic plate and the position detecting elastic plate, one of which is the motor starting elastic plate and the contact point. The abutment of the plate also has a function of starting the motor and a fixed position and a stop contact of the motor side and the non-motor side of the link disk.

(Operation) With the above-described configuration, the output gear has the long and short cams formed in the outer peripheral portion of the rotation shaft of the output gear, which are axially symmetrical and have substantially the same convex shape and different lengths. When the output gear and the link disc are rotated by the drive from the motor through the deceleration gear train, the elastic plates at the positions contacting the long and short cams are fixed and one of the output disc and the link disc is fixed. Since the conductive elastic plate can come into contact with both short and long cams, the conductive elastic plate goes off from the contact point of the contact plate at every 180 degrees of the rotary shaft, and the other conductive elastic plate has a long cam. Since it can only come into contact with the rotary shaft, it becomes a switching mechanism that separates from the contact at every 360-degree position of the rotary shaft and turns off.In addition, the fixed position detection mechanism also lengthens the length of the link disk at the output end of the motor deceleration mechanism. The stop position of the hole (motor side or non-motor side) It can be identified immediately.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings, but the present invention is not limited to this embodiment.

The deceleration mechanism of the present invention includes an upper case 31 for housing a motor 1 and a deceleration gear train 2 as shown in the exploded perspective view of FIG.
And a lower case 30 and a plurality of gear rows 2
Is a worm gear 20 mainly attached to the motor shaft 10 of the motor 1, a worm wheel 21 that meshes with the worm gear 20, an idle gear 22 that meshes with the worm wheel 21, and a reduction gear 22a that meshes with the idle gear 22.
It is composed of an idle gear 22b that meshes with the output gear 23 and a final stage output gear 23. Therefore, in the drive from the motor 1, the rotation is transmitted and the speed is reduced in the above-described order. In addition, the above-mentioned worm wheel 21, idle gear 22, and deceleration gear 22a
The idle gear 22b and the idle gear 22b are attached to the kana shaft 26, respectively.

The output gear 23 is composed of a gear that meshes with the idle gear 22b and a rotating shaft 23b of the shaft portion, and the outer peripheral portion of the rotating shaft 23b has substantially the same convex portion in the axial direction and symmetrically (oppositely). Cams 24 and 25 having different shapes and different lengths are formed. In this embodiment, the long and short cams 24, 25 are formed at axially symmetrical positions, but the motor 1 is different from the symmetrical position because it varies depending on the load fluctuation (a position where either cam is shifted). Good. Further, the length of the short cam 24 and the length of the long cam 25 are approximately half the length of the long cam 25 and the length of the short cam 24 as shown in FIG.

Then, the convex portion 4a on the lower surface of the link disk 4 is fitted into the concave portion 23a of the output gear 23 from the outside of the upper case 31 through the hole 34 at the corresponding position of the upper case 31 where the final stage output gear 23 is located. . Here, since the convex portion 4a is D-shaped, the output gear 23 does not slip (the concave portion 23a is also D-shaped). Further, when the link disk 4 is fitted to the output gear 23, the elongated hole portion 4b of the link disk 4 is located on the side of the short cam 24 of the output gear 23 (the sixth position).
See figure).

Next, the switching mechanism of this embodiment will be described.
For example, an elastic plate 51 (for starting the motor) and an elastic plate 52 (for detecting the position) made of a brass plate are arranged at positions on both sides of the output gear 23 that come into contact with the cams 24, 25, and a tip is provided at the central portion. The contact plate 5 having the contact portions of the protruding pieces 5a and 5b slightly displaced vertically is provided on the side. The protruding piece 5 of the contact plate 5
a and 5b are elastic plates 5 due to the rotation of the cams 24 and 25 described above.
Contact (contact) the tip side of 1, 52. That is, the short cam 24
Contacts one elastic plate 51 only once per revolution,
25 is configured to come into contact with both elastic plates 51 and 52 twice per rotation. Further, the elastic plates 51 and 52 and the contact plate 5 are provided with notches 53 at the rear end side thereof, respectively.
1, 52 and the contact plate 5 to the stepped portion 36 at the edge of the upper and lower cases 30 and 31.
It is fitted and inserted into and fixed in the slits 35 provided at three locations.

It should be noted that the elastic plates 51, 52 have a step (shift) in the height direction when they are fitted and inserted as shown in FIGS. 4A and 5A. Incidentally, particularly in this embodiment, the contact plate 5, the elastic plates 51, 52
Since it suffices to insert it into the slits 35 of the cases 30 and 31, workability at this point is also extremely short, and since the notch 53 is fitted to the step 36 of the slit 35,
The effect is that movement in the front-back direction is completely sealed.

In addition, the contact between the elastic plate 51 (for starting the motor) and the contact plate 5 is such that the starting of the motor 1 and the motor side of the link disk 4 (360
Degree) and non-motor side (180 degree) fixed position and stop contact. Therefore, the motor can be restarted without requiring a special sensor for restarting the motor or complicated control.

On the other hand, the shape of the elastic plate 51 is adjusted so that it contacts the cam 24 (which means that it also contacts the cam 25). The shape of the elastic plate 52 is adjusted so that it contacts only the cam 25, and the elasticity of each is adjusted. When the plates 51 and 52 do not come into contact with the cams 24 and 25, they are set to come into contact with the contact plate 5.

Next, hook hooks 32 are formed inward at four locations on the three sides of the upper case 31, and hook grooves 33 for stopping the hook hooks 32 are formed at locations corresponding to the lower case 30, and both hooks are hooked. It constitutes a stop mechanism.

Therefore, when assembling this embodiment, the motor 1 and the reduction gear row 2 including a plurality of gears are arranged in the lower case 30, and the brass elastic plates are provided on both sides of the brass contact plate 5.
51, 52 are arranged and passed through the slits 34 of the upper and lower cases 30, 31,
After the notch 53 of the contact plate 5 and the elastic plates 51, 52 is fitted and attached to the step 36 that stands up the outside of the slit 35, the upper case 31
And, by using the hooking mechanism provided on the lower case 30, when the four hooks 32 are fitted into the upper case 31 and the lower case 30 along the hook grooves 33, the tips of the hooks 32 are inserted. The upper and lower cases 30, 31 are integrated with each other by hooking at the extreme end of the hooking groove 33, and the present embodiment (FIG. 3) is assembled.

After this, the convex portion 4a of the link disc 4 of the output connector is placed on the upper case.
The holes 34 of 31 are fitted into the recesses 23a of the output gear 23 of the final stage. An elongated hole portion 4b is provided on the outer peripheral edge of the link disk 4 of the output connector, and the elongated hole portion 4b and the external mechanism are connected to each other.

In the specification of the external mechanism of this embodiment, when the output gear 23 rotates via the reduction gear train 2, the link disc 4 of the output connector also rotates, and the long hole portion 4b of the link disc 4 is rotated by the fixed position detection mechanism. Will stop only at the positions of the motor side (the side with the motor 1) and the non-motor side (the side without the motor 1).

Because of the above-mentioned configuration, it is not necessary to connect and fix the upper case 31 and the lower case 31 using screws or the like at a plurality of positions in the hooking mechanism, and in the present embodiment, the hooking mechanisms 32 and 33 are simply connected between the two. Since it is only integrated with the above, there is an advantage that workability in assembling and disassembling and repairing the equipment is extremely short, and the manufacturing cost is naturally low.

Further, in the switching mechanism capable of turning ON / OFF the two circuits, the cams 24 and 25 having symmetrical positions on the outer peripheral portion of the rotary shaft 23b of the output gear 23 and having different axial lengths are provided with one conductive elastic plate. Since the short cam 51 and the long cam 25 can come into contact with each other, the contact 51 is separated from the contact plate 5 at every 180 degrees of the link disc 4 to be in the OFF state, and the other conductive elastic plate 52 is provided.
Can be easily realized by a switching mechanism in which only the longer cam 25 can contact.

Further, the fixed position detection mechanism of this embodiment is used as a paper feed mechanism of the above-mentioned cut sheet feeder of the copying machine as an application, but in this case, the paper feed mechanism is inadvertently locked for some reason. In such a case, even if it is necessary to automatically determine in what state the paper feed mechanism is in timing, the rotation of the link disc 4 of the present embodiment is used to cause the long hole portion 4b of the link disc 4 to move. Whether the position is on the motor side or the non-motor side can be detected by detecting a short circuit or non-short circuit.

(Effects of the Invention) As is apparent from the above configuration, in the upper and lower cases, a reduction mechanism including a motor and a reduction gear train, a switching mechanism for detecting a position by contact between a convex cam and a switch, and a reduction gear In a motor deceleration mechanism having a mechanism for connecting the output of the gear train to an external mechanism through an output connector,
On the outer peripheral portion of the rotation shaft of the output gear at the end of the deceleration gear train, cams having substantially the same convex and short lengths are formed at axially symmetrical positions, and the cams on both sides contacting the cam are formed. The elastic plate at the position is fixed to the case, the short cam makes contact with one elastic plate only once in one rotation, the long cam makes contact with both elastic plates twice in one rotation, and the elastic plate further comes into contact with the elastic plate. A contact plate having a contact portion that comes into contact with the elastic plate at the central portion of the elastic plate and fixed to the case, thereby forming a switching mechanism including contact between the cam, the elastic plate and the contact plate. Thus, the means for determining the position state of the output connector of the output end of the motor deceleration mechanism is a mechanism for turning on and off the two circuits, which can be easily realized.

Further, in the motor deceleration mechanism, a link disk having an elongated hole in the outer peripheral edge is provided coaxially with the output gear at the end of the deceleration gear train, and the outer periphery of the output shaft of the output gear is axially symmetrical. A cam having substantially the same convex and short lengths is formed at the position where the two long holes of the link disk and the cam with a short output gear are fitted at the same position, and two cams that contact the cam are provided. A fixed position detection mechanism in which the elastic plate and one contact plate are fixed in the case, and the long holes stop when the output gear and the link disk rotate via the reduction gear train on the motor side and the counter motor side. In this fixed position detection mechanism, the long and short cams contact two elastic plates, and when not short-circuited in the OFF state, the long hole is located on the motor side, and the long cam contacts one elastic plate. hand
When the short cam is in contact with the other elastic plate in the OFF state, but there is no short circuit, the long hole is located on the side opposite to the motor during the short circuit in the ON state. Due to the configuration in which it is detected that the long hole is located on either side, when it is used for the paper feed mechanism of the cut sheet feeder of a copying machine, for example, the paper feed mechanism is locked for some reason. However, since the position of the paper feed mechanism can be immediately detected, the paper feeding mechanism can be repaired in a short time.

Further, in the motor deceleration mechanism, the elastic plates that come into contact with the cams of the output gears are the motor starting elastic plate and the position detecting elastic plate, and one of them is the motor starting elastic plate and the contact plate. Since the contact also has the starting and stopping contacts on the motor side of the link disk and on the motor side of the link disk and the non-motor side, it can be restarted without requiring any special sensor or complicated control for restarting the motor. Can be done.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of the present invention, FIG. 2 is an assembled sectional plan view of the present invention, FIG. 3 is a front view of the same, FIG. 4A is an enlarged plan view of an essential part showing a switching mechanism, and FIG. 4B is the same. A side view, FIG. 5A is an enlarged plan view of an essential part showing a switching mechanism, FIG. 5B is a side view of the same, FIG. 6 is an enlarged view of an output gear, FIG. 7 is an electrical connection diagram, and FIG. 8 is a timing chart. 2 ... deceleration gear train, 23 ... output gear, 24 ... cam (short), 25
... Cam (long), 30 ... Lower case, 31 ... Upper case, 4 ... Link disc, 4b ... Slot, 5 ... Contact plate, 51 ... Elastic plate, 52 ...
Elastic plate,

Claims (3)

[Scope of utility model registration request] 1. A deceleration mechanism composed of a motor and a deceleration gear train, a switching mechanism for detecting a position by abutting a convex cam and a switch, and an output connector for outputting the output of the deceleration gear train in the upper and lower cases. In a motor deceleration mechanism having a mechanism for connecting to an external mechanism via an outer peripheral portion of the rotation shaft of the output gear at the terminal end of the deceleration gear train, substantially the same convex shape is formed at axially symmetrical positions. Forming a cam having long and short lengths, and fixing elastic plates on both sides in contact with the cam to the case, the short cam contacts one elastic plate only once per revolution, and the long cam A contact plate having a contact portion that comes into contact with both elastic plates twice in one rotation and contacts when the elastic plate is not in contact with the cam is arranged in the central portion of the elastic plate and fixed to the case. , A switch consisting of the contact of the cam with the elastic plate and the contact plate Position detecting mechanism in the output connector to the reduction mechanism of the motor, characterized in that the quenching mechanism. 2. A deceleration mechanism of the motor, wherein a link disk having an elongated hole portion at an outer peripheral edge is provided coaxially with an output gear at a terminal end of the deceleration gear train, and an outer peripheral portion of a rotary shaft of the output gear. A cam having substantially the same convex and short lengths is formed at axially symmetrical positions, and the long hole of the link disc and the short output cam are fitted at the same position, and the cam is fitted. Two elastic plates and one contact plate that are in contact with each other are fixed in the case, and the long holes stop when the output gear and the link disk rotate via the speed reduction gear row on the motor side and the non-motor side. In this fixed position detection mechanism, the long and short cams come into contact with the two elastic plates and the long hole is located on the motor side when the short circuit is not shorted in the OFF state and the long cam is on one side. The short cam comes into contact with the other elastic plate. In the case of a short circuit in the N state, the long hole is located on the side opposite to the motor, and the fixed position detection mechanism detects that the long hole of the link disk is located in either side. The fixed position detecting mechanism for the output connecting member in the motor deceleration mechanism according to claim 1, wherein. 3. In the motor deceleration mechanism, the elastic plates contacting the cam of the output gear are two elastic plates for motor starting and elastic plates for position detection, and one of them is an elastic plate for starting motor. 3. The output of the reduction mechanism of the motor according to claim 1 or 2, wherein the contact of the contact plate also serves as a start and start contact of the motor and a fixed contact and a stop contact on the motor side and the non-motor side of the link disk. Fixed position detection mechanism for connecting tools.