JP2738476B2 - String feeding mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a binding cord, and more particularly, to a cord feeding mechanism for sequentially feeding a cord having a large amount of expansion and contraction, such as a rubber cord, wound and stored therein.

[0002]

2. Description of the Related Art As a string feeding mechanism, there is a conventional structure as proposed by the present applicant in Japanese Utility Model Application No. 3-36314. In other words, a guide roller is provided rotatably at the midpoint of the string fed from the winding string while the string is wound, and the rotation of the guide roller is suppressed by the urging force of the spring to reduce the friction of the rubber string. It is configured to apply resistance to string payout using force.

[0003]

However, in the above-mentioned conventional structure, the outer diameter of the lace gradually decreases as the lace is consumed, so that the weight of the lace changes sequentially.
As a result, in spite of the fact that the static inertia force of the winding cord changes when the cord is unreeled, in the above-described conventional brake mechanism, the braking force is always constant. , And the adverse effect that the tension of the string at the time of the binding action changes is likely to occur. An object of the present invention is to eliminate the above disadvantages.

[0004]

According to a feature of the present invention, in the cord feeding mechanism described at the beginning, a friction brake member which slides on the winding outer peripheral surface of the winding string by its own weight is provided outside the winding string. The point is that it is swingably supported and provided at a fulcrum position that gradually approaches a horizontal posture from a vertically inclined posture as the diameter becomes smaller.

[0005]

When the consumption of the cord is small, the outer diameter of the cord is large, so that the friction brake member comes into sliding contact with the outer peripheral surface of the cord in a vertically inclined posture. The component force in the normal direction on the sliding contact surface is small, and the braking force is small. When the outer diameter of the wrapping cord decreases with the consumption of the cord, the posture of the friction brake member gradually approaches a horizontal posture, and the component force in the normal direction on the sliding contact surface increases, and the braking force is increased. Will change greatly. Therefore, it is possible to effectively prevent the static inertia of the wound string from being small and the tension of the string from being weakened when the string is extended.

[0006]

Therefore, the extremely simple structure of swinging and supporting the brake member and causing the brake member to slide in contact with its own weight,
It is possible to gradually change the braking force greatly while responding to the change in the static inertia due to the change in the outer diameter of the winding cord, and to provide the one that can minimize the change in the tension of the feeding cord as much as possible I can do it.

[0007]

Embodiments will be described below with reference to the drawings. FIG.
FIG. 4 to FIG. 4 show a general-purpose binding machine that binds to-be-tied objects a such as soft and long vegetables such as cut flowers, leeks, and asparagus using rubber strings. The binding machine includes an electric motor 2 as a driving source and a knot mechanism 3 inside the box 1, and a cord storage unit 5 in which a rubber cord 4 for binding is wound and stored above the outside of the box 1. ,
A needle 6 (an example of a feeding mechanism) for feeding out the rubber cord 4 at a high speed from the winding string storage section 5 and supplying the rubber cord 4 to the knot mechanism 3 along the upper working table 7 of the box 1. The object to be tied a is artificially placed and supplied to perform the tying operation. A pulley 9 provided on an output shaft 8 of the electric motor 2 and a bearing member 1 erected from the bottom of the box 1
A transmission belt 14 is stretched over a pulley 13 provided on the relay shaft 12 supported by the gear shaft 0, and a gear 15 provided on the relay shaft 12 and a large-diameter gear 17 which is fitted around the driven shaft 16 in a freely rotatable manner. The large-diameter gear 17 and the driven shaft 16
And a one-turn clutch mechanism 18 is interposed therebetween. A driving crank mechanism 19 for driving the needle 6 is provided at one end of the driven shaft 16, and is linked to a driving shaft 21 of the knot mechanism 3 via a bevel gear mechanism 20 provided at the other end to branch off. It has been transmitted.

As shown in FIGS. 4 and 5, the one-rotation clutch mechanism 18 includes a boss portion of the large-diameter gear 17 and the driven shaft 1.
6, a pawl clutch 22 is provided between the driven side meshing portion 22a and the driving side meshing portion 2 of the claw clutch 22.
2b, the locking plate 23 is inserted into the shaft radially inward from the upper side in a pressing and biased state to set the clutch to a disengaged state. By driving the electromagnetic solenoid 25 to swing away from the claw clutch 22, the clutch can be set to the engaged state. Immediately after the clutch is engaged, the electromagnetic solenoid 25 is turned off to operate the driven shaft 16.
Makes one rotation, the locking plate 23 is engaged along the inclined cam surface 26 formed on the outer peripheral surface of the driven side engaging portion 22a, and the driven side engaging portion 22a gradually slides toward the clutch disengagement side. Thus, only one rotation is performed. The electromagnetic solenoid 25 is configured to be turned on only for a short time by the operation of one of the foot switch SW1 and the hand switch SW2 disposed at the foot of the worker. A changeover switch SW3 is provided which can be switched between a state using the foot switch SW1 and a state using the hand switch SW2. The hand switch SW2 causes the operating piece 27 to protrude upward from the workbench 7 at a position on the upper side of the knot mechanism 3 at the passing position at the time of placing and supplying the material to be tied, and It is configured to automatically enter and operate upon contact.

The needle 6 is provided so as to be exposed upward from the worktable 7, and is pivotally supported by a needle support case 28 projecting upward from the worktable 7 so as to be swingable about the horizontal axis X1. . That is, the boss portion 3 is rotatably integrated with a rotation shaft 29 rotatably supported by the needle support case 28.
The support arm 31 is bent from the boss portion 30 into a V shape, and the needle 6 is connected to the tip of the support arm 31. Then, the drive arm 32 attached to the rotation shaft 29 and the crank mechanism 19 are moved inside the needle support case 28 by a push-pull rod 33.
The drive arm 32, that is, the needle 6 is swingably driven over a predetermined range by the crank mechanism 19 to supply the rubber string 4 to the knot mechanism 3.
The needle 6 is urged to return to the upper standby position by a spring 34 disposed in the needle support case 28. When the one-rotation clutch mechanism 18 is in the disengaged state, the elastic force of the rubber cord 4 that extends extends. It is configured not to stop at an unstable position displaced downward from a predetermined standby position.

As shown in FIGS. 1 to 3 and FIG. 9, the cord storage section 5 supports the cord 36 rotatably by a support member 35 extending from the needle support case 28, and extends the cord 36. A slack removing rod 37 acting on the string is provided, and a pair of string guide rollers 39 and 40 are attached to the tip of a support rod 38 extending from the needle support case 28. A guide roller 4 which is located on the lower side of the supply of the supply string.
After being wound once around 0, the guide roller 40 is supplied to the needle 6, and the guide roller 40
By pressing the button 1, the degree of feeding can be adjusted. As shown in FIG. 24, the winding cord 36 is rotatably supported on a lateral support shaft 60, and is configured by externally fitting a paper cylindrical body 62 to a pair of left and right metallic supports 61. It is. Further, the friction brake member 63 that slides on the winding outer peripheral surface of the winding string 36 by its own weight is set at a fulcrum position that gradually approaches a horizontal position from a vertically inclined position as the outer diameter of the winding line 36 decreases. It is supported and arranged to swing freely. In other words, as shown in FIG. 23, the friction brake member 63 is made of a linear bar, and pivots vertically around the axis X3 parallel to the horizontal support shaft 60 on the boss 64 formed on the support member 35. It is configured to be supported and slidably contact the winding string 36 by its own weight. The friction brake member 63 is a screw type adjusting mechanism 6
5, the length of protrusion in the longitudinal direction can be adjusted so that the braking force can be changed. When the outer diameter of the winding cord 36 is large, the brake member 63 has a large vertical inclination and a small braking action component. When the force is large, the tension of the payout string is prevented from changing as much as possible by the change of the static inertia. Rubber cord for binding 4
As shown in FIG. 11, streak-shaped irregularities 4b continuous in the longitudinal direction of the cord were formed on the surface of the band-shaped rubber plate main body 4a to improve the sliding in the longitudinal direction, and the objects to be bound were bundled. It is configured so that appropriate tension can be obtained in this state.

The knot mechanism 3 is provided in the form of a knotter building, holds and holds one end of a rubber string 4 and overlaps a new string supplied by the needle 6 with a held string. A string holder 42 to be set,
A knot building 43 for winding and knotting the two overlapping string portions as described above is provided, and the string holder 42 and the knot building 43 are arranged such that their respective rotational drive axes are parallel to each other. A pair of timing gears 45 and 46 for driving these are mounted on the node drive shaft 21. A locking groove 43a for preventing the string from shifting is formed in the string holding portion of the knot building 43. Then, at a position near the upper side of the knot building 43,
At the time of string winding operation of the knot building 43, i.e., when forming the knot by winding the rubber string portion held and held by the string holder 42 and the rubber string portion after winding the object to be tied, A string guide member 47 for locking and holding the string portion at a predetermined actuated position is provided, and after the string winding operation by the knot building 43 is completed, the string guide member 47 is arranged in a direction substantially orthogonal to the string supply direction by the needle 6. Moving means A for moving
Is provided. More specifically, as shown in FIG. 10, the string guide member 47 is provided in a plate shape that covers the upper part of the knot building 43, and the two string portions enter and engage along the moving direction of the binding object a. A stop recess 48 is formed, and the swing support arm 4
Reference numeral 9 indicates that the joint drive shaft 21 is pivotally supported by the support bracket 44 so as to be swingable about an axis along the axis of the node drive shaft 21. The swing support arm 49 is urged by a spring 50 to swing toward the above-mentioned working posture, and a cam follower 52 is brought into contact with and engaged with a cam 51 provided on the knot driving shaft 21, so that the above-mentioned working posture and the knot building The moving means A is configured so as to swing and move from the position of retreating from the upper position. In this way, while being wound by the knot building 43,
When the string guide member 47 is switched to the retracted posture, the string comes off from the knot building 43, and the knot operation ends. At the lower end of the string guide member 47 in the moving direction,
As shown in FIG. 10, a cutout recess 47 a having a shape substantially along the outer shape of the knot building 43 is formed. With this configuration, even when a thick rubber cord having a large tension is used, the rubber cord 4 is pulled out while directly handling the string portion wound around the knot building 43, so that a sufficient knot is formed. There is an advantage that a knot operation can be performed. The rotating shaft 29 of the needle 6 is connected to the rotating shaft of the knot building 43 and the string holder 4.
The rubber string 4 is arranged so as to be supplied to the knot building 43 and the string holder 42 at a substantially uniform level.
The needle support case 28 is provided in an inclined posture so that a knot space can be increased. The string guide member 47
Is provided in the vicinity of the lock recess 48, a cord pulling member 53 that can be switched between a retaining position for closing the entrance portion of the locking concave portion 48 and a position for opening the entrance portion is provided. A posture switching means B for switching the member 53 to the retaining posture is provided. That is, as shown in the figure, the string pulling member 53 is pivotally supported by the support bracket 44 so as to be swingable about an axis X2 orthogonal to the axis of the knotting drive shaft 21, and is pivoted toward the open position by the spring 54. And the cam follower 55 connected to the joint drive shaft 21
, And is configured to swing by switching and contacting with a cam 56 provided in the above. In addition, a string guide plate 57 is provided between the knot building 43 and the string holder 42 for regulating the rubber string 4 having one end held by the string holder 42 at a predetermined standby position when the needle 6 is withdrawn. The string guide plate 57 is arranged so as to approach the outer end rotation locus of the string cutting cutter 58 provided in the string holder 42 at a minute interval smaller than the thickness of the rubber string.

Next, the binding operation procedure will be described. FIG.
2 to 18 show an operation procedure. From the standby state in which the end of the rubber string 4 is sandwiched and held by the string holder 42 and the needle 6 is in the upper standby position, the tied object a is placed on the worktable 7 and supplied along the lower side of the string. When the object to be tied a near the binding action point, the object to be tied a is switched to the hand switch SW2.
, The one-turn clutch mechanism 18 is operated to drive the driven shaft 16 one turn. Then, as shown in FIG. 12, the needle 6 operates to supply the rubber string 4 to the knot mechanism 3. At this time, the string guide roller 4
The cord wound around 0 is further wound in the direction in which the cord is wound with the operation of the needle 6, and the feeding of the cord is almost stopped. Then, before the needle 6 reaches the maximum entry position, first, the string pulling member 53 switches from the open position to the retaining position. Immediately thereafter, the knot building 43 is rotationally driven to wind the string portion 4c held by the string holder 42 and the string portion 4d supplied by the needle 6 together to start the knot operation. At this time, the string guide member 47
Is set to the working position. Thereafter, when the needle 6 reaches the maximum entry position, the string holder 42 is rotated from that point to align the two string portions 4c and 4d to form the knot building 43.
Act to be wound up. And knot building 4
When the winding operation of No. 3 is completed, the string pulling member 53 is switched to the open position, and the cutting cutter 58 provided on the string holder 42 approaches the string guide plate 57 to cut both string portions. The guide member 47 swings laterally from the action posture, pulls out the string wound around the knot building 43, and the knot operation ends. At this time, as described above, since the rubber cord 4 is hardly extended from the needle 6 side, the rubber cord 4 during the knotting operation is in an extended state, and when the cord is cut, the rubber cord 4 is first held by the string holder 42. Since the held string portion 4c is in an extremely elongated state due to its winding action, when cut, the string portion 4c comes off from the knot portion of the knot building 43, and the knot of the object to be tied becomes It is in a so-called union knot state (FIG. 21). As a result, when the rubber string 4 is removed from the tied object a, when the one string portion is pulled,
The rubber cord can be easily removed from the stretching action of the rubber cord and the sliding action of the unevenness 4b formed on the rubber cord. Moreover,
Since the knot building 43 and the string holder 42 are provided so that their respective drive shafts are parallel to each other, when the winding operation by the string holder 42 is performed, the posture of the two string portions positioned between the knot building 43 and The rotation direction of the string holder 42 is substantially parallel to the knot spring 42a, so that the knot operation is not hindered. In addition, by forming streaky irregularities 4b on the surface of the rubber string 4, the string holder 4
In the pinching action by 2, the pinch element slides appropriately in the longitudinal direction and can maintain an appropriate pinching force, so that the holding action can be performed smoothly. When the needle is retracted to the standby position, the winding of the string is loosened from the guide roller 40, and the rubber string 4 is retracted by the retraction operation.
It is paid out from.

[0013] In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings.

[Brief description of the drawings]

FIG. 1 is an overall side view of a general-purpose binding machine.

FIG. 2 is a longitudinal side view of a general-purpose binding machine.

FIG. 3 is a longitudinal sectional side view of a general-purpose binding machine.

FIG. 4 is a cross-sectional plan view of a general-purpose binding machine.

FIG. 5 is a side view of a part where a one-turn clutch mechanism is provided.

FIG. 6 is a side view of the needle drive system.

FIG. 7 is a side view of a driving cam mechanism of the string pulling member.

FIG. 8 is a diagram for explaining the operation of the string pulling member.

FIG. 9 is a side view of the string feeding section.

FIG. 10 is a perspective view of a string guide member.

FIG. 11 is a cross-sectional view of an elastic cord.

FIG. 12 is an explanatory view of a binding operation.

FIG. 13 is an explanatory view of a binding operation.

FIG. 14 is an explanatory diagram of a binding operation.

FIG. 15 is an explanatory diagram of a binding operation.

FIG. 16 is an explanatory diagram of a binding operation.

FIG. 17 is an explanatory view of a binding operation.

FIG. 18 is an explanatory view of a binding operation.

FIG. 19 is a side view of the string knot mechanism.

FIG. 20 is a diagram illustrating the operation of the string guide plate.

FIG. 21 is a perspective view of an object to be bound after the binding.

FIG. 22 is an electric circuit diagram

FIG. 23 is a cutaway side view of a portion where the friction brake member is provided.

FIG. 24 is a cutaway plan view of a portion where a friction brake member is provided.

[Explanation of symbols]

 4 String 6 Feeding mechanism 36 Winding string 60 Lateral support shaft 63 Friction brake member

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-52-81145 (JP, A) JP-A 60-28967 (JP, U) JP-A 44-25146 (JP, Y1) JP-A 28- 2044 (JP, Y1)

Claims (1)

(57) [Claims] A cord (36) in which a cord (4) is wound and housed is rotatably fitted to a lateral support shaft (60), and the cord (4) is fastened from the cord (36) at a high speed. A cord payout mechanism provided with a payout mechanism (6) for paying out.
The friction brake member (63) which slides on the outer peripheral surface of the winding by the weight of (6) is moved from the vertically inclined posture to the horizontal posture gradually as the outer diameter of the winding cord (36) becomes smaller. A string feeding mechanism that is swingably supported and deployed at the fulcrum position.