JPS62124352A - Stepping mechanism - Google Patents

Abstract

PURPOSE:To prevent two pawls feeding easily, by releasing the engagement of a stepping member with feed pawls, in the middle of a feeding action after an engaging stop pawl got over one pawl of the ratchet portion of the stepping member and before it gets over two pawls thereof. CONSTITUTION:When a dowel 13b is rotated around an axis 13a clockwise and a pawl driving lever 14 is swung clockwise, a ratchet member 9 rotates in the opposite direction by a feed pawl. In the middle of the feeding action, when the arm portion 17b of the feed pawl 17 is touched with the dowel 14b of the pawl driving lever 14, the feed pawl 17 becomes not able to rotate around a dowel 14c further. After that, the feed pawl 17 rotates around the axis 13a integrally with the pawl driving lever 14, a pawl portion 17a escapes in the direction of releasing the engagement with the ratchet member 9 according to the rotation.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a stepping mechanism, particularly a stepping member that performs a driving movement in one direction by moving a ratchet part, and a stepping member that performs a driving movement in one direction. The present invention relates to a two-stepping mechanism that includes a driving pawl and a locking pawl that holds the stepping member at the one-step position.

[Traditional branch technique]

Figure 3 shows the tree configuration of the conventional stepping mechanism.
- It is a side view. In FIG. 3, lot has a lever C that is moved in a $1 field. I
It is supported by a pin 102 that fits into the L hole so that it can slide in the direction of the arrow 103, and some load is applied in the direction of the arrow 103.

Reference numeral 104 indicates a ratchet portion 10 provided on the lever 101.
1b and moves the lever! The relation I that has (y) I-
Rotate II with the L claw around the car 104a.
The spring 105I hung on the arm 104b always causes an anti-u!
I= , the force is being moved by 1 in the il direction.

1 convex C1↓ ,, -blind 8 I
T-mark 1b1! −← 1 Y L mouth σ 1
The dowel 107 was inserted into the warehouse lever 107 and sunk.
c, the arm 106a and the lever 10 are held in rotation IIr function.
It is always biased counterclockwise by a spring 110 inserted between the bent portions 107b of 7.

107 is a drive driven by an unillustrated drive source, -1- It is supported by a downward elongated hole 107a and a bottle 108 fitted in the elongated hole so that it can slide in the vertical direction,
The arm portion 107d is on the right. 109 is a dowel planted in the main plate (see figure 1), which restricts the movement of the drive lever 107 in seven directions.

The operation will be explained below. When the drive lever 107 is driven in the direction shown in the figure by a drive source (not shown), the feed pawl 106 also moves in the same direction via the tab l07c.

The feed pawl 106 moves the lever 101 in the -1 direction in the figure via the ratchet 7 + part 101b, and the latch 11 pawl 104 moves one pawl east over the ratchet part 101b to a further position. So, the arm part 107d is Guho 109
When it comes into contact with 1', the feeding operation stops.

After that, when driven/<-107 returns to the initial position,
The lever 101 moves toward the lower blade in the drawing due to the load 103, and when it returns to the above-mentioned "certain predetermined distance", the engaging pawl 104 and the ratchet portion 101b engage.

The lever 101 is engaged IF- at the position moved by one claw. 110, ``The reason why the arm 107d is fed an extra certain length is to ensure one claw feed against various noises.Similarly, the arm 107d contacts the dowel 109)!'1. This is a stopper to prevent wind blowing.

FIG. 4 is an IF diagram showing another conventional example of a stepping mechanism.
Reference numeral 201 denotes a step-driven member, which is rotatably held around a support 201b, and is subjected to some kind of load 64 in a clockwise direction.

Reference numeral 202 denotes a drive lever driven by a drive source (not shown), which has a long hole 2o2a in the downward direction. l:,',jA slide ti(1-) in one direction with the pin 205 that fits into the elongated hole
It is supported by the arm 202b and the tab 202c.
02d is on the right.

203 is a feed claw that drives the member 201, and the dowel 20
The arms 203a and +i are held rotatably around 2d.
The arm 7 of drive L//202 is biased in the anti-IIIF direction by a spring 206 suspended between it and R202b.

204 holds the member 201 described in 111j in the moving position +
(+ +f ~ It is rotatably held by a claw around a shaft 204a, and biased in the opposite direction by a spring 207 hung on an arm and a shaft 204b.

In the following 14 configurations, the drive 1- is driven by an unillustrated drive source.
/ When the bar 202 is driven in the direction (G) in the figure, the feed claw 20
3 also moves in the same direction via the turbo 202d. Feed claw 2
03 is arm 1":'d 203 a is tab 2゜2C and Ii
When the member 201 is turned back, it does not rotate in the 181 force direction, but rotates in the 1:1 direction when the member 201 is turned back, via the guard and ratchet 201a. As the member 201 rotates counterclockwise, the ratchet 1 R201a engaged with the feed pawl 203 escapes in the direction of releasing the engagement. It will be canceled, but this time clerk 11-
The claw 204 has already crossed one claw.

[Invention or solution I - problem to be solved]

A contact sound is generated between the stone bar 109 of the claw feed guard II and the arm portion 107d. In addition, when it comes into contact with the brush bar 109, the transmission system between the feed claw 106 and the drive source that drives the feed claw may become jammed, causing the system to stop. The mechanism becomes complicated.

To return the lever 101 to the initial position after the operation of step 1, step 11. There is a problem in that the mechanism becomes complicated because both the pawl 104 and the feed pawl 106 must be released from the ratchet portion 101b.

On the other hand, the ratchet portion 201a and the feed pawl 2 in FIG.
The relative relationship 03 operates in the direction of disengaging from the initial stage of the feeding operation.

If the structure is designed to take advantage of the initial stage of operation, the driving force required for operation will be extremely large. Also,
Since the feed claw 203 moves only in the IAAl1 direction during the feeding operation, the feed claw 203 moves depending on the diameter of the 1ffl material 201.
The diameter of the member 201 is determined by the diameter of the member 201.
Engineering a, ]lt ′, :″ 7 h =
＋ LIS h・昌=n、月 ・There was a problem in that the degree of freedom was severely restricted.

The present invention has been made in order to eliminate the drawbacks of the prior art described in 1-1, and provides a simple mechanism that does not cause malfunctions, has few miscellaneous FFs, and can easily release and return to the initial 1υ position. The purpose is to

Structure of the invention [Means for solving the problem] Unissued 1. ! 11 includes a walking member A having a ratchet portion and making a stepping drive movement in one direction, a feed pawl for driving this stepping member, and a retaining pawl 7 for holding the stepping member in the stepping position. In the equipped Ayumu 11 mechanism, 1iii secretary! lTwo claws?+
iii. The stepping mechanism is characterized in that the stepping member and the feed pawl are disengaged from each other during the feed operation after the ratchet portion has been crossed by one pawl and before the ratchet portion has been passed over the second pawl. be.

[For production]

11 - Since the mechanism is configured such that the engagement between the advancing member and the feed pawl is released during the feeding operation after the pawl passes over the ratchet portion by one pawl and before the pawl exceeds the second pawl, so that two pawl feeding does not occur. 5. Therefore, the conventional two-jaw feed prevention I toss stopper is not required, and the miscellaneous γV caused by contact with the stomper can be eliminated. Further, the disengagement mechanism for returning to the initial position requires only the engagement claw to be disengaged, so the structure is in the cylinder.

〔Example〕

Figure 1 shows a cine camera to which the stepping mechanism of the present invention is applied) 1
FIG. 1 is a perspective view showing the mechanism, and in FIG.
to the right. - The arm 1a on the side is connected to the axis of the lens barrel 1.
It extends rearward in one line, and holes 1b-1c passing through the holding par 2 are provided on both end faces of the 7, and dowels 1d are implanted at other positions. Further, the other arm portion 1e is provided with a notch 1f that fits into a shaft 4 provided on a base plate (not shown).

The l-leg holding part 2 holds the lens barrel l and the lens barrel i described below.
! J! The movable member 6 is slidably fitted and held and held on a base plate (not shown). 5 is the photographic lens group, rii7
6 is held in the lens barrel 1. 111j Sj:
The L-tube movement member 6 has a rack portion 6d, and this rack portion 6
d is connected to the gear portion 9a of the ratchet member 9, which will be described later, and
The holding par 2 passes through the holes 6a and 6b L'j and slides IT (it is properly fitted and held, and the spring 7 penetrating and held by the holding par 2 described in <I'm being watched. However, since the arm portion 6C is in contact with the focus adjustment screw 30, as a result, the lens barrel 1 described in 111j and the lens barrel movement member 6 slide together along the holding part 2, and +iiij The arm 6e is biased toward the right rear by the spring 3, or in the case of the charge form fm, the arm 6e comes into close contact with the dowel 8 planted in the base plate (not shown) and stops 1.
I'm L.

Reference numeral 9 denotes the ratchet member, which is rotatably fitted and held in the hook 9b, and has a gear jX39a expressed as a single body.
is aligned with the rank portion 6d of the lens barrel movement member 6 (-).

10 is a permanent magnet, and 11 is a yoke that forms a magnetic field.

12 is a rotor as an electromagnetic drive member.

The rotor receiver is joined and held by the member 13. This loader=ya+rtp↓J l 7 I+dil+ 1 ”<
2 t-yama c'+ 1. Dill+il hr tit
j The dowels 13bφ13c and 13d are implanted and sunk into the liver.

(2) 4 is a claw drive lever, which is fitted into the sleeve 13a for rotation 11T, and dowels 14a, 14bφ14c are implanted therein. The dowel 14a is always biased in the counterclockwise 1 direction by a spring 15 hooked on the dowel 14a, and the arm portion 14d comes into contact with a dowel 29 planted on a base plate (not shown).

16 is a hook 1F that rotates around the shaft 16b with a spring 18 that is fitted into the arm 16a.
a constantly biases the claw portion 16a in the counterclockwise direction to +i
It engages with the ratchet member 9 marked D and rotates the ratchet member clockwise at the 51st turn.

17 is a feed pawl, which is rotatably fitted into the dowel 14c and biased counterclockwise to -9 by a spring 18;
The claw portion 17a engages with the ratchet I member 9 of 1111.

19 Crawling, rotate around +l+ l 9 d with chi claw 1
The spring 2 is fitted with a single spring and is tensioned 11 times on the arm portion 19a.
It is always biased in the counterclockwise 1,1 direction by the force 1, and the arm portion 19c is in contact with the arm portion 6e of the lens barrel movement member 6.

Reference numeral 21 denotes a connecting lever, which is rotatably fitted around the lever 21b, and is always rotated counterclockwise by a spring 22, so that the dowel 21a, which is planted and sunk at the - end, connects to the dowel 13e.
A wall portion 21c and a dowel 21d are planted at the other end.

23 is a blade drive lever, which rotates around the shaft 23a +j(
The spring 24 always rotates counterclockwise.
The arm part 23d is forced to move to the part 1 which will be described later! The end face 25b of the Nileper 25 is abutted +1-, and the dowels 23b and 23c
has been planted.

L arrangement (1, , <-25 is rotation I around the dowel 25a
＋[It is fitted in the function, and is always rotated clockwise by the spring 26 (・
[+: /j, and the side surface 25c stops when it comes into contact with a dowel 28 (not shown) planted in the base plate, and the end surface 25b
is in contact with +iii arm portion 23d.

Reference numeral 27 denotes a two-piece shunter blade, which is fitted into a t-+ blade that rotates around the shaft 27a, and has the dowel 2 in the long groove 27b.
3c is fitted. Reference numeral 30 denotes a focus adjustment screw A. By adjusting this screw, the relative position between the lens barrel l and the lens barrel movement member 6 changes, and focus adjustment is achieved.

The operation will be explained below. When the camera starts operating due to the release action of the photographer, the distance to the subject is measured by a known pressure path measuring device.

Next, the photographing lens is moved to a position corresponding to the distance to the subject and focus adjustment is performed.

When the rotor 12 is energized on the AF side (hereinafter referred to as positive energization), a current flows in the magnetic field formed by the permanent magnet 10 and the yoke 11, and the rotor 12 operates according to Fleming's left-hand rule. The force (moves). Therefore, the rotor 12 and the rotor receiver 13 are moved toward the shaft 13a.
Rotate clockwise around .

When this rotor receiver 13 starts to rotate clockwise, the dowel 13b
pushes the pawl drive lever 14 and the result.

The pawl drive lever 14 also begins to rotate clockwise around the shaft 13a, and the pawl portion 17a of the feed pawl 17, which is fitted and held in the dowel 14c implanted in the drive lever, moves to the ratchet member 9? Rotate counterclockwise.

When the ratchet 1/member 9 rotates counterclockwise, the gear part 9a also rotates counterclockwise, so the lens barrel movement member 6 is held at -2 through the rank part 6d connected to the gear part 9a! (Press \ to slide to the left + iii in the figure, and at the same time,
Also slides to the left front h in the figure.

When the rotor 12 is normally energized as described in i, the photographing lens moves, and the pawl portion 16a of the engagement II pawl 16 passes over the ratchet member 9 by one pawl, and the iF of the electric circuit (not shown) is moved.
Is it energized or entrusted?

When the positive current to the rotor 12 is cut off, the spring 15
9 force causes the pawl drive lever 14 to rotate in the 1,1 direction on the opposite side and push the tab 13b, so the rotor receiver 13 and (10-ta 12) also rotate in the 9,1 force direction on the opposite side, and the pawl portion of the feed pawl 17 1
7a climbs over the ratchet member 9 by one claw, contacts the arm portion 14d or the turbo 29 by one inch, and returns to the initial position.

Focus adjustment is achieved by repeating the above-described operations until the photographing lens is moved to the position where the photographic lens is moved by one tooth in movement 1 described below.

Next, exposure control is performed. When the rotor 12 is energized in the opposite direction to that described above, a force f@ opposite to that described above is applied to the rotor 12, and the rotor 12 and rotor receiver 13 begin to rotate counterclockwise.

When the rotor receiver 13 starts rotating counterclockwise, the dowel 1
3d pushes the arm 16d of the locking claw 16, so the locking claw 16
rotates clockwise to engage the pawl portion 16a and the ratchet member 9.
However, since it engages with the claw portion 17a of the feed claw 17 and maintains the engagement between the claw portion and the ratchet member 9, the lens barrel 1 is moved by the force A and 1 of the spring 3. It never returns to its initial position.

Also, since the dowel 13c pushes the dowel 21a of the connecting lever 21, this connecting lever 21 starts rotating in the direction of force 111r, and the dowel 21d moves to the 1F-lever 25 side 11'l!
25 Press c and the lever starts rotating in the -1 direction.

If! +L shi]<-';'5-h<
Haj II! i , (lIi +; +i
L7 1ii1! r + X) - MQ1f
ii 25 b Drive the blade/<-23(7) Arm i''
? 1!23 d(7) The engagement 1 is released and the blade drive lever is rotated counterclockwise by the biasing force of the screw 24.
The shutter blade 27 is opened via the dowel 23c and driven in the direction of " ], and the dowel 23b comes into contact with the wall 2fc of the connecting lever 21 and stops upward.

In this way, when the shutter blade is opened and exposure is started, and an appropriate amount of exposure is achieved, communication '1 to the rotor 12 is established.
The service is cut off. When the reverse current to the rotor 12 is cut off, the connecting lever 21 rotates counterclockwise due to the biasing force of the spring 22, and the wall portion 21c pushes the dowel 23b of the blade drive lever 23 to move the blade drive lever clockwise. The rotor 12 and rotor receiver 13 are rotated and returned to the initial position to close the shunter blade 27, and the dowel 21a pushes the dowel 13c of the rotor receiver 13 to return the rotor 12 and rotor receiver 13 to the initial position.

Exposure control ends at l-, but proper exposure lI
) may be detected and controlled by any known method, and the description thereof will be omitted here since it is not directly related to what is shown in Fig. a.

By the way, the launch claw 19 is moved counterclockwise by the old force of the spring 20 because the lens barrel movement member 6 has moved to the front left in the figure due to the aforementioned focus adjustment operation, and the contact between the arm portion 6e and the arm portion f9c is released. However, the arm 19a comes into contact with the wall 16c of the engaging FF claw 16 and stops.

Further, when the locking claw 16 rotates clockwise due to the exposure control operation described above, the wall portion 16c and the arm 19a described in rtij.
is released, the launch claw 19 rotates counterclockwise, and the launch claw 19e comes into contact with the wall portion 16c.

Then, when the rotor receiver 13 rotates clockwise due to the above-mentioned reverse energization to the rotor 12 being cut off, the rotor holder 13 rotates clockwise.
3d escapes and the latch +L claw 16 attempts to rotate counterclockwise due to the biasing force of the spring 18, but the wall portion L6c
Since the claw portion 16a stops when it comes into contact with the ratchet member 9, the claw portion 16a does not engage with the ratchet member 9.

As is clear from the above explanation, at the time when focus adjustment and exposure control are completed, the difference from the initial 11JI state is that the lens barrel l has moved.
- It is 2.jA of the point 11- engaged with the claw 16 rotated clockwise.

Therefore, the next step is to return the two points to the initial state.
The rotor 12 is subjected to an IE test. Is the rotor 12 positively energized +i? The operation of moving the lens barrel l is carried out in the same way as described in i. This operation will be detailed below.

Figure 2 (a)-(b) and (c) are the manual steps in the 1111th feed operation 1. (a) is the initial state 1n; (b) is in the middle of the feed movement.

(c) shows the state where the feeding operation is completed, and is the same as in Fig. 1 above.
For the 11 items, the time code is represented by H.

First, in the initial state shown in FIG. 2(a), the rotor 12
Due to the driving force of , tab l' 3 b becomes 4qb l 3 a
Rotate in the direction of the force with the center at the center to drive the claw 1/-"-1
4 II! When the ratchet member 9 is rotated in the 1 force direction, the feed pawl 17 rotates the ratchet member 9 in the 5:1 direction via the turbo 14c.
Along with the feeding operation, the ratchet member 9 is rotated counterclockwise around the dowel 14c by the urging force of the spring 18.

Next, as shown in FIG. 2(b) during the feeding operation, the arm portion 17b of the feeding claw 17 comes into contact with the dowel 14b implanted in the claw-driven /<-14, and the feeding claw 17 Although it is no longer possible to rotate counterclockwise around the dowel 14c, at this point the engagement pawl 16 has passed the ratchet member 9 by a small amount, and the engagement between the feed pawl 17 and the ratchet member 9 is medium S' It is configured so that it can be used to win or escape. After that, the feed claw 17 is driven around the shaft 13a/<-14
The claw portion 17 rotates integrally with the
While further rotating the ratchet member 9 counterclockwise, the element a escapes in the direction of disengaging the engagement, and is finally disengaged as shown in FIG. 2(C). In this regard, it is configured to be performed before the pawl portion 6 passes over the ratchet member 9 by one more pawl.

The above is the movement in the feed direction, and according to this mechanism, the engagement is made in a positive and negative manner until the air feed is achieved, so one malfunction of the pawl skipping does not occur, and the two pawls are not engaged. Since the engagement is always released before feeding, there is no possibility of malfunction during two-claw feeding, and when the release is performed, the engagement is configured in a way that allows the release to be performed smoothly with a small amount of force. .

Thereafter, when the +E current to the rotor 12 is cut off, the feed pawl 17 and the pawl drive l/8 14 return to the initial position shown in FIG. 2(a). When the iE is energized and the gear is advanced by one tooth, the engagement between the tooth member 9 and the feed pawl 17 is released at the final stage of the feed operation.
J: Since the pawl 16 is engaged with the ratchet member 9, the lens barrel l is in its initial state due to the biasing force of the spring 3! 8 and rotate the ratchet member 9 in one direction, and the lens barrel 1 is held at the moved position.

By the way, as mentioned above, when the focus adjustment and exposure control are completed, the +I-claw 16 is rotated in one direction. It is engaged by the latch pawl 19 in a state where the engagement with the ratchet member 9 is released. Therefore, positive current is applied to the single-slot rotor 12, as shown in Fig. 2.
When the engagement between the feed pawl 17 and the ratchet member 9 is released as shown in FIG. At the same time as the slide moves, the ratchet member 9 also rotates in the time=1 direction and returns to the initial position.

At the final stage of this return operation, the arm 6e presses the arm 19c of the latch claw 19 to rotate the latch claw 19 clockwise until it comes into contact with the dowel 8 and stops F.

This is because the claw 19 rotates clockwise.

The lock 0 - the lock 1 of the pawl 16 is released, and the lock +L pawl is released by the spring 1.
It is rotated counterclockwise by the biasing force of 8 and returns to the initial position where it engages with the ratchet member 9. I-L
Focus on all the movements in the explanation, J! Iffj, exposure control, and return to the initial state are performed without any problems.

C.1 As described in detail, the stepping mechanism of the present invention has the following effects.

(+) Until the ratchet member is fed by one pawl, the ratchet member and the feed pawl are engaged with each other until the ratchet member is fed by one pawl.Since the ratchet member and the feed pawl are engaged with each other, the pawl does not unravel by one pawl, and the feed operation stroke Even if it is rough, it will definitely send one claw. Also,
Since the engagement is released before the 2-jaw feed, 2-jaw feed does not occur and the 2-jaw feed prevention L [second stopper is not required].

Therefore, it is possible to eliminate the miscellaneous problems caused by contact between the two-jaw feed prevention 11 and the stopper, which has been a problem in the past.

(2) The disengagement mechanism for returning to the initial position may be a disengagement mechanism using only the engagement IF claw, which simplifies the mechanism.

(3) Release of the feed pawl is performed smoothly because the engagement is overcome by escape, and large force is not required.

(4) Send! J Is the straw/7 cry IJV conspiracy unnecessary between the claw's motive power source and the mechanism is cylinder? Becomes 11.

[Brief explanation of drawings]

Figure 1 is a perspective view of the internal mechanism of a cine camera to which the stepping mechanism of the present invention is applied, Figures 2 (a), (b), and (c) are city views showing the operation of the stepping mechanism of the present invention; Figure 4 shows a conventional stepping mechanism iF+I'+i l'4. 9...Stepping member (ratchet member), 16...Register 1
1-claw, 17... feed claw.

Claims (2)

[Claims] (1) A stepping member that has a ratchet portion and performs stepping drive movement in one direction, a feed pawl that drives the stepping member, and a locking pawl that holds the stepping member in the stepping position. In the stepping mechanism, the engagement between the stepping member and the feeding pawl is released during the feeding operation before the locking pawl crosses the ratchet portion by one pawl and the second pawl. Features a stepping mechanism. (2) At the start of the stepping operation, the engagement between the stepping member and the feed pawl is configured to be engaged, and after the engaging pawl has passed over the ratchet part by one pawl, the engagement is made to escape and become successful. ,
Claim (1) characterized in that the direction of movement of the feed pawl is regulated in the disengagement direction.
Stepping mechanism described in section.