JPH0823749A - Binding device - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the clutch arm is once in the clutch disengaged position and the driven rotor is in the free state by sensing the focusing pressure, the driven rotor is rotated forward by the pressing action of the clutch actuating pawl. Thus, it is possible to prevent the string supply needle from preceding and jumping out into the focusing space before the final operation of the scraping packer. When the focusing pressure is less than a set value, a clutch activator 22a connected to a clutch stop arm 22 engages and supports the clutch arm 19 to hold it in a clutch disengaged position. Focusing pressure sensing door 7
When the clutch stopping arm 22 is displaced by the backward displacement, the clutch actuating element 22a of the clutch stopping arm 22 is disengaged from the clutch arm 19, and the clutch arm 19 is biased and oscillated in the clutch engaged posture. In the apparatus, a braking member 26 is provided that engages with a trapezoidal recess 25 formed in the peripheral portion of the driven rotary body 17 at the stop position and blocks forward rotation of the driven rotary body 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a binding device used for binding a cut grain culm in a binder or binding a discharged straw in a combine.

[0002]

2. Description of the Related Art A binding device for a binder, which is an example of the binding device described above, has a scraper packer that is constantly driven in the front part of a focusing space as shown in, for example, Japanese Utility Model Laid-Open No. 2-116060. Swinging is performed by reciprocatingly turning across the passage, and the focusing pressure generated by the pushing-in action of the scraping packer on the stem culm is detected by the focusing pressure sensing door located at the rear of the focusing space, and the focusing pressure exceeds the set value. Then, the focusing pressure sensing door is moved backward to activate the one-turn clutch, and the scraping packer performs the final stalk-pushing action, and at the same time, the string supply needle driven via the one-turn clutch is used as the scraping packer. The knotting string wraps around the culm, which rushes into the nodule through the pressed culms, and then the knotting-type knotting mechanism of the knot operates. After that, the focusing pressure sensing door, which also functions as a discharge arm, is rotated 180 degrees to eject the bundled stems from the focusing space backward, and the string supply needle is returned to the original retracted position. It moves so that the one-turn clutch is automatically disengaged. The one-rotation clutch includes a drive rotating body that is constantly rotating, a drive protrusion provided on the drive rotating body, a clutch cam that is supported to rotate concentrically with the drive rotating body, and is pivotally supported by the clutch cam. And a driven body (roller) provided at the tip of the clutch arm, and the driven body rotates as a drive protrusion when the clutch arm swings. It is configured to move in and out of the trajectory. When the clutch arm is reciprocally rocked against the spring, the driven body deviates from the rotation locus of the drive projection to bring about the “clutch disengagement” state in which only the drive rotation body rotates. When the arm is urged and oscillated by the spring, the driven body projects into the rotation locus of the drive projection, the driven body is pressed by the drive projection, and the clutch cam rotates integrally with the drive rotation body. The "engaged" state is brought about, and the rotation of the clutch cam is transmitted to the string supply needle and the knot through a gear or a chain. A clutch actuating pawl for switching the posture of the clutch arm is provided at the tip of the clutch stop arm that is urged to rotate in a certain direction by the focusing pressure setting spring, and the clutch actuating pawl is within the revolution path of the clutch arm. When it rushes in and engages with the engaging portion of the clutch arm, the clutch arm is held in the clutch disengaged posture swung against the spring, and when the clutch actuating pawl deviates from the revolution path of the clutch arm, the clutch arm is released. The clutch is in the posture of being swung by the spring. Further, the clutch stop arm is engaged with the projection of the door shaft provided with the focusing pressure sensing door to prevent the door shaft from receiving the focusing pressure and rotating, and setting the sensed focusing pressure. In the above case, the clutch stop arm is swung backwards against the spring via the protrusion. In other words, if the focusing pressure of the stalks packed in the focusing space is less than the set value, the clutch actuating pawl of the clutch stop arm engages with the clutch arm and holds it in the clutch disengagement position, Is above the set value and the clutch stop arm swings backwards, so that the clutch actuating pawl is disengaged from the clutch arm and the clutch arm is in the clutch engaged posture. When the clutch cam is near the end of one rotation after the one-turn clutch is engaged and activated, the clutch actuating pawl of the clutch stop arm is thrust into the turning locus of the clutch arm and is on standby. As a result, the clutch arm is engaged with the clutch actuating pawl and is forcibly swung relatively against the spring to be in the clutch disengagement posture, and when the clutch cam makes one revolution, the one-turn clutch is disengaged.

[0003]

In the binding device having the above-mentioned structure, even if the clutch actuating pawl of the clutch stop arm is disengaged from the clutch arm by sensing the focusing pressure, the one-turn clutch is not immediately put in, but is swept in. The culm pushing action is performed the last time after the packer has carried out the scraping to detect the focusing pressure, and at that time, the scraper packer crosses the stalk culm passage and the stalks to be bound and the next bundled culm. The operation of the scraping packer and the clutch engagement timing are set so that the string supply needle rushes into the space in which the and are pushed apart, but the following problem may occur. In other words, when the focusing pressure above the set value acts on the focusing pressure sensing door by the scraping operation of the scraping packer, the clutch stop arm retracts against the spring and the clutch actuating pawl disengages from the clutch arm. The returning pressure of the scraping packer reduces the focusing pressure and causes the clutch stop arm to swing by the spring, so that the clutch actuating pawl is pressed against the back surface of the clutch arm in the clutch disengaged posture.

Here, conventionally, since the engaging claw portion of the clutch arm is formed in a tapered shape and the back surface thereof is a curved slope, as described above, the swinging force by the spring considerably starts the clutch. When the pawl is pressed against the inclined back surface of the clutch arm, a rotational component force in the forward direction is applied to the clutch arm, and the driven rotary body in the free state rotates slightly forward before being driven through the one-rotation clutch. However, the string supply needle will rush into the culm passage before the final scraping operation by the scraping packer.

When the string-feeding needle precedes and enters the stem-culm passage in this way, as shown in FIG. 6, a part of the stem-culm that is scraped by the scraping packer for the final scraping operation is removed. It is sandwiched between the back of the preceding string supply needle and the scraping packer. Although the stem culms sandwiched between the string supply needle and the scraping packer are originally to be bundled, they are not bundled because they are located on the back side of the string supply needle. However, it will remain undisturbed in the converging space by being subjected to the scraping action and the releasing action without being bound, and the next time, the converging posture of the converging stems will be disturbed and the stockholder alignment will be deteriorated. Also, if the stem culm sandwiched between the string supply needle and the scraping packer is flexible, it may be cut off.
In addition, if the amount of pined stems is large, the string feeding needle may be deformed due to the strong action of the scraping packer.

The above phenomenon may occur also in the combine straw discharging device, and particularly in the discharging straw binding device of the specification in which the string supplying needle is arranged above the focusing space, the self-weight of the string supplying needle. Acts as a force to rotate the driven rotating body in the forward direction, as described above,
When the driven rotator is in the free rotation state, the string supply needle may be more likely to project forward into the lower focusing space.

The present invention has been made paying attention to such a point, and even if the clutch arm is once in the clutch disengaged posture and the driven rotor is in the free state by sensing the focusing pressure, the clutch actuating pawl is released. The driven rotating body is rotated forward by the pressing action by the, etc., and the purpose is to prevent the string supply needle from preceding and jumping into the focusing space before the final operation of the scraping packer. To do.

[0008]

DISCLOSURE OF THE INVENTION The present invention comprises a scraping packer for packing stalks from the front into a focusing space, and a focusing pressure sensing door for receiving the stalks focused in the focusing space from the rear.
A clutch stop arm that gives a predetermined elastic resistance to the backward displacement of the focusing pressure sensing door, a clutch starter that is connected to the clutch stop arm, and a one-rotation clutch that is turned on and off based on the forward / backward movement of the clutch stop arm. The one-rotation clutch includes a drive rotating body that is constantly driven to rotate, a driven rotating body that is provided concentrically with the drive rotating body so as to be freely rotatable, and a swingable pivotally supported by the driven rotating body. And a clutch arm that is urged to oscillate in a certain direction, and when the clutch arm is in the clutch engaged posture in which the clutch arm is urged and oscillated, the drive protrusion provided on the drive rotor and the clutch arm engage with each other. When the driven rotary body rotates integrally with the drive rotary body and the clutch arm is in the clutch disengaged posture in which it is swung backwards against the biasing force, the engagement between the drive projection and the clutch arm is released. When the focusing pressure is less than the set value, the clutch starter connected to the clutch stop arm engages and supports the clutch arm to hold it in the clutch disengaged posture. When the focusing pressure detection door moves backward and the clutch stop arm is displaced by detecting the focusing pressure above the set value, the clutch activator connected to the clutch stop arm disengages from the clutch arm and the clutch arm enters the clutch. In a binding device configured to oscillate in a posture,

According to the first aspect of the present invention, there is provided a braking member that engages with a trapezoidal recess formed in the peripheral portion of the driven rotary body at the stop position to prevent forward rotation of the driven rotary body. Characterize.

According to a second aspect of the present invention, the clutch arm is provided with a clutch stop arm receiving portion, and the clutch arm is disengaged from the clutch activator and is in the clutch engaged posture. The outer peripheral surface of the clutch stop arm receiving portion is formed into an arc surface centering on the rotation axis of the driven rotating body, and a part of the clutch stop arm after disengaged from the clutch arm by the detection of focusing pressure and operating Is abutted and supported on the outer peripheral surface of the clutch stop arm receiving portion.

[0011]

According to the above characteristic structure of the invention according to claim 1,
When the focusing pressure above the set value acts on the focusing pressure sensing door due to the scraping operation of the scraping packer, the clutch stop arm retracts against the spring and the clutch actuating pawl comes off the clutch arm, and the driven rotation with the clutch arm The body is free. Immediately after the clutch actuating pawl is disengaged from the clutch arm, the focusing pressure decreases due to the return movement of the scraping packer, the clutch stop arm swings by the spring, and the clutch actuating pawl is in the clutch disengaged posture. However, since the forward rotation of the driven rotating body is suppressed by the braking mechanism, the driven rotating body is held at the initial stop position, and the string feeding needle converges before the final operation of the scraping packer. It does not project to the space side.

Further, according to the above-mentioned characteristic structure of the invention according to claim 2, when the focusing pressure more than a preset value acts on the focusing pressure sensing door by the scraping operation of the scraping packer, the clutch stop arm retracts against the spring. Then, the clutch actuating pawl is disengaged from the clutch arm, and the driven rotating body provided with the clutch arm becomes free. Immediately after the clutch actuating pawl is disengaged from the clutch arm, the focusing movement is reduced by the returning movement of the scraping packer, and the clutch stop arm is swung by the spring. At this time, only a part of the clutch stop arm is strongly pressed against the circular arc-shaped peripheral surface of the clutch stop arm receiving part of the clutch arm in the clutch engaged posture, and the press contact causes the amount of rotation in the forward direction to the driven rotor. No force is generated.

[0013]

Therefore, according to the first aspect of the present invention, it is possible to prevent the string supply needle from projecting ahead of the focusing space side before the final operation of the scraping packer. It has become possible to prevent the occurrence of a phenomenon in which the stem culms are sandwiched between the back surface of the preceding string supply needle and the scraping packer, and to avoid various problems caused by the stem stalks being sandwiched.

According to the second aspect of the invention, in addition to the above effects, the clutch arm and the clutch stop arm are used, so that a dedicated braking component is not required and the structure is simplified. But it will be effective.

[0015]

1 is a side view of a binder equipped with the binding device 1 of the present invention, and FIG. 2 is a plan view of the binding device 1. This binder cuts the plant origin of the planted grain culm caused by the raising device 2 at the front of the fuselage with the clipper-type reaping device 3, and feeds the harvested grain culm transversely to the right side of the aircraft to the binding device 1. Supplied in a standing posture of falling backward, when the set amount of grain culms are bundled, they are bundled and forcedly discharged to the right of the aircraft,
It is configured so as to be in a sideways posture and to be left in the field one after another. The bundling device 1 is provided at the rear side of the focusing space S,
A scraping packer 4 that is constantly driven to draw a constant circulation locus so as to push the grain stalks that have been fed laterally along the grain culm passage into the focusing space S, and a string supply needle that winds and binds a binding cord to the focusing grain culm. 6. A rotary focusing pressure sensing door 7 also serving as a discharging arm is provided, and a knotting-building type knot 8 is provided on the front side of the focusing space S. 4 is reciprocally rotated so as to traverse the grain culm passage, and the scraping operation is performed. The focusing pressure generated by the pushing-in action of the scraping packer 4 is detected by the focusing pressure sensing door 7, and when the focusing pressure exceeds the setting, the focusing is performed. The pressure-sensing door 7 is moved back and forth to activate a one-rotation clutch C, which will be described later, which is housed in the binding case 9, and the scraping packer 4 performs the final push-in operation, and at the same time, through the one-rotation clutch C. The string feeding needle 6 that is moved forwardly rotates, passes through the grain culms pressed by the scraping packer 4, and enters the nodule portion 8 to wind the binding cord around the focused grain culm, and then makes one rotation. The knot portion 8 driven via the clutch C operates to knot the binding cord 5, and thereafter,
The focusing pressure sensing door 7 is rotated by 180 degrees to discharge the bundled stems culm backward from the focusing space S, and the string supply needle 6 is rotated back to the original retracted position. Is automatically turned off.

3 and 4 show the internal structure of the binding device 1 and the structure of the one-rotation clutch C. As shown in FIG. An input shaft 11, which is constantly driven to rotate, a needle drive shaft 12 and a door shaft 13, which are intermittently driven via a one-rotation clutch C, are provided upright on the rear side of the focusing space S in the case 9 of the binding device 1. One rotation of the input shaft 11 causes the scraping packer 4 to make one reciprocating circulation rotation.
1 and the scraping packer 4 are interlocked with each other via a crank mechanism 14, and the needle 6 is reciprocally swung once about the door shaft 13 by one rotation of the needle drive shaft 12. The drive shaft 12 and the string supply needle 6 are interlockingly connected via a crank mechanism 15.

The one-rotation clutch C is a gear-shaped drive rotating body 16 loosely fitted to the needle drive shaft 12, a drive protrusion 16a provided on the upper surface of the drive rotating body 16, and a disk fixed to the needle drive shaft 12. -Shaped driven rotating body 17, a clutch arm 19 pivotably supported by the driven rotating body 17 about a fulcrum a and urged by a spring 18 to swing in a fixed direction, and a tip of the clutch arm 19. And a driven body (roller) 19a provided in the drive body 16a. The driven body 19a moves inward and outward by the swinging of the clutch arm 19 and moves into and out of the rotation locus of the drive protrusion 16a. . Then, when the clutch arm 19 is swung backwards against the spring 18, the driven body 19a moves toward the drive protrusion 16a.
When the clutch arm 19 is deviated inward from the rotation locus of No. 1 and only the driving rotary body 16 rotates, and when the clutch arm 19 is biased by the spring 18, the driven body 19a is driven. When the driven body 19a is pushed into the rotation locus of the projection 16a, the driven body 19a is pressed by the drive projection 16a, and the driven rotary body 17 rotates integrally with the drive rotary body 16, resulting in a "clutch engaged" state. The rotation of the driven rotary body 19 is transmitted to the needle drive shaft 12, the rotation of the needle drive shaft 12 is transmitted to the door shaft 13 via the gear transmission mechanism 20, and the rotation of the needle drive shaft 12 is further transmitted. Is transmitted to the knot operating shaft 8a of the knot portion 8 via the chain transmission mechanism 21.

A clutch actuating member 22a having a tapered shape for switching the posture of the clutch arm 19 is provided at the tip of the clutch stopping arm 22 which is swingably supported about the fulcrum b, and the clutch stopping arm 22 is provided.
Is urged to rotate in a certain direction by the focusing pressure setting spring 23, and when the clutch activator 22a rushes into the revolution locus of the clutch arm 19 and engages with the locking claw portion 19b of the clutch arm 19, Is held in the clutch disengaged posture swung against the spring 18, and when the clutch activator 22a moves outward from the revolution trajectory of the clutch arm 19, the clutch arm 19 enters the clutch swung by the spring 18. Become a posture.

Further, a pair of projections 24 having a phase difference of 180 degrees are fixedly attached to the door shaft 13 which rotates integrally with the focusing pressure sensing door 7, and the clutch stopper arm 22 serves as the projection 2.
4 to prevent the door shaft 13 from rotating by receiving the focusing pressure, and when the focusing pressure acting on the door 7 exceeds a preset value, the clutch stop arm 22 converges via the projection 24. It is configured to swing backwards against the pressure setting spring 23.

That is, if the focusing pressure of the grain culms packed in the focusing space S is less than the set value, the clutch stopping arm 22
Of the clutch activator 22a of the clutch arm 19 engages with the locking claw portion 19b of the clutch arm 19 to hold it in the clutch disengagement posture
When the focusing pressure of the grain culms exceeds the set value and the clutch stopping arm 22 swings backward, the clutch activator 22a is disengaged from the clutch arm 19 and the clutch arm 19 is in the clutch engaged posture. Further, after the one-rotation clutch C is engaged and actuated, when the driven rotary body 17 reaches the end of one rotation, the clutch activator 22a of the clutch stop arm 22 plunges into the rotation locus of the clutch arm 19 and stands by. With the rotation of the driven rotor 17, the clutch arm 19 is engaged with the clutch activator 22a and relatively urged against the spring 18 to forcibly swing into the clutch disengagement position. When it rotates, the one-turn clutch is disengaged.

The above construction and operation are not particularly different from the conventional ones, and the present invention is characterized by the following constructions. That is, a trapezoidal concave portion 25 that opens to the outside is formed in the peripheral portion of the driven rotary body 17, and in the state where the one-rotation clutch C is disengaged and the driven rotary body 17 is stopped, the fulcrum c A braking member 26 rotatably arranged around the
The tip claw portion is biased and engaged in the recess 25 by the rotational biasing force of the spiral spring 27, and resists the rotation of the driven rotary body 17 in the forward direction.

According to this structure, when the focusing pressure exceeding the set value acts on the focusing pressure sensing door 7 by the scraping operation of the scraping packer 4, the clutch stop arm 22 moves backward against the focusing pressure setting spring 23 and the clutch moves. The starter 22a is disengaged from the locking claw portion 19b of the clutch arm 19, and the clutch arm 19 swings to the clutch engaged posture. Then, immediately after the clutch activator 22a is disengaged from the locking claw portion 19b,
The focusing pressure is reduced by the returning movement of the scraping packer 4, the clutch stop arm 22 is swung by the focusing pressure setting spring 23, and the clutch activator 22a is pressed against the back surface of the clutch arm 19 in the clutch disengaged posture. However, since the forward rotation of the driven rotating body 17 is suppressed by the engagement between the concave portion 25 and the braking member 26, the driven rotating body 17 is held at the initial stop position and before the last-time scraping operation of the scraping packer 4. In addition, the string supply needle 6 does not project ahead of the focusing space S side. Then, when the one-rotation clutch C is engaged and the driven rotating body 17 is forcibly driven to rotate forward, the rear end portion 25 a of the trapezoidal recess 25 is moved to the braking member 26.
It kicks out against the spiral spring 27 and continues forward rotation.

FIG. 5 shows a second embodiment of the present invention. In this example, the basic configuration and operation of the binding device 1 are the same as those of the previous embodiment, so a detailed description thereof will be omitted, and only main parts will be described. That is, the clutch arm 19 is provided with a clutch stop arm receiving portion 28 so as to overlap with the locking claw portion 19b engaged with the clutch activator 22a, and when the clutch arm 19 is in the clutch engaged posture. The outer peripheral surface F of the clutch stop arm receiving portion 28 is formed in an arcuate surface centered on the rotation axis of the driven rotary body 17, and the tip of the clutch stop arm 22 overlaps with the clutch activator 22a for braking. A part 29 is attached.

According to this structure, as shown in FIG. 5A, when the clutch arm 19 is engaged with the clutch activator 22a and is in the clutch disengaged posture, the clutch stop arm receiving portion 28 is disengaged from the braking portion 29. Therefore, when the clutch arm 19 is disengaged from the clutch activator 22a and is in the clutch engagement posture, the braking portion 29 of the clutch arm 19 strongly adheres to the outer peripheral surface F of the clutch stop arm receiving portion 28 as shown in FIG. It is pressed, and the forward rotation of the driven rotating body 17 is blocked by the frictional resistance of this pressed portion, and the driven rotating body 17 is held at the initial stop position, and the string supply needle 6 is converged into the converging space S before the final scraping operation of the scraping packer. It does not project to the side. When the one-rotation clutch C is entered and the driven rotary body 17 is forcibly driven to rotate forward, the clutch stop arm receiving portion 28 moves forward with respect to the braking portion 29 of the clutch arm 19 and comes off.

[Other Embodiments] In the above embodiments, the binding device for the cut grain culms of the binder is taken as an example, but the present invention can also be applied to the discharging straw binding device for combine harvesters.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

[Figure 1] Overall side view of the binder

FIG. 2 is a plan view of the binding device.

FIG. 3 is a vertical sectional side view of the binding device.

FIG. 4 is a plan view of a one-rotation clutch portion.

FIG. 5 is a plan view of an essential part of another embodiment.

FIG. 6 is an operation explanatory diagram in a needle leading state.

[Explanation of symbols]

 4 Packer 7 Focusing pressure sensing door 16 Drive rotor 16s Drive protrusion 17 Driven rotor 19 Clutch arm 22 Clutch stop arm 22a Clutch activator 25 Trapezoidal recess 26 Braking member C 1 rotation clutch S Focusing space

Claims (2)

[Claims] 1. A scraping packer (4) for packing stalks into the focusing space (S) from the front, and a focusing pressure sensing door (7) for receiving the stalks focused in the focusing space (S) from the rear.
A clutch stop arm (22) for giving a predetermined elastic resistance to the backward displacement of the focusing pressure sensing door (7), and a clutch starter (2) connected to the clutch stop arm (22).
2a) and a one-rotation clutch (C) that is turned on and off based on the forward / backward movement of the clutch stop arm (22), and the one-rotation clutch (C) is always driven to rotate by a drive rotor (16). And a driven rotary body (17) which is concentrically provided with the drive rotary body (16) and is free to rotate, and a driven rotary body (17) pivotably supported by the driven rotary body (17) and swinging biased in a fixed direction. When the clutch arm (19) is in the clutch engagement posture in which the clutch arm (19) is biased and swung, the drive protrusion (16) provided on the drive rotating body (16) is provided.
a) and a part of the clutch arm (19) are brought into contact with each other, the driven rotating body (17) rotates integrally with the driving rotating body (16),
When the clutch arm (19) is in the clutch disengaged posture in which it is swung backwards against the biasing force, the drive projection (16a)
And the clutch arm (19) are disengaged from each other to stop the rotation of the driven rotating body (17). When the focusing pressure is less than the set value, the clutch stop arm (2
The clutch starter (22a) connected to 2) holds the clutch arm (19) in the clutch disengaged posture by engaging and supporting the clutch arm (19), and the focusing pressure sensing door (7) is displaced backward by sensing the focusing pressure above the set value. When the clutch stop arm (22) is displaced, the clutch activator (22a) of the clutch stop arm (22) is disengaged from the clutch arm (19),
A binding device configured to urge the clutch arm (19) to oscillate in the clutch engaged posture, and engages with a trapezoidal recess (25) formed in the peripheral portion of the driven rotary body (17) in the stop position. And a braking member (26) for preventing forward rotation of the driven rotating body (17). 2. A scraping packer (4) for packing stalks into the focusing space (S) from the front, and a focusing pressure sensing door (7) for receiving the stalks focused in the focusing space (S) from the rear.
A clutch stop arm (22) for giving a predetermined elastic resistance to the backward displacement of the focusing pressure sensing door (7), and a clutch starter (2) connected to the clutch stop arm (22).
2a) and a one-rotation clutch (C) that is turned on and off based on the forward / backward movement of the clutch stop arm (22), and the one-rotation clutch (C) is always driven to rotate by a drive rotor (16). And a driven rotary body (17) which is concentrically provided with the drive rotary body (16) and is free to rotate, and a driven rotary body (17) pivotably supported by the driven rotary body (17) and swinging biased in a fixed direction. When the clutch arm (19) is in the clutch engagement posture in which the clutch arm (19) is biased and swung, the drive protrusion (16) provided on the drive rotating body (16) is provided.
a) and a part of the clutch arm (19) are brought into contact with each other, the driven rotating body (17) rotates integrally with the driving rotating body (16),
When the clutch arm (19) is in the clutch disengaged posture in which it is swung backwards against the biasing force, the drive projection (16a)
And the clutch arm (19) are disengaged from each other to stop the rotation of the driven rotating body (17). When the focusing pressure is less than the set value, the clutch stop arm (2
The clutch starter (22a) connected to 2) holds the clutch arm (19) in the clutch disengaged posture by engaging and supporting the clutch arm (19), and the focusing pressure sensing door (7) is displaced backward by sensing the focusing pressure above the set value. When the clutch stop arm (22) is displaced, the clutch activator (22a) of the clutch stop arm (22) is disengaged from the clutch arm (19),
A binding device configured such that a clutch arm (19) oscillates in a biased manner to the clutch engaged posture, wherein a clutch stop arm receiving portion (28) is connected to the clutch arm (19), and the clutch arm (19) is provided. Is disengaged from the clutch activator (22a) and is in the clutch engaged posture, the outer peripheral surface (F) of the clutch stop arm receiving portion (28) is the driven rotating body (1).
7) is formed in an arcuate surface centering on the axis of rotation, and a part of the clutch stop arm (22) after being disengaged from the clutch arm (19) by the detection of the focusing pressure and operated is the clutch stop arm. A binding device, which is configured so as to come into contact with and be supported by the outer peripheral surface (F) of the receiving portion (28).