JP2801586B2 - Ratchet pawl lifting device in wire feed mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to a ratchet pawl push-up device for a wire feed mechanism, and more particularly to a ratchet pawl push-up device for a wire feed mechanism that pushes up the ratchet pawl of the feed mechanism during its return process, thereby avoiding collision friction with the ratchet and preventing noise and wear.

[0002]

2. Description of the Related Art As shown in Figures 8 and 9, a conventional wire rod feeding device mainly comprises a feeding mechanism 1, a ratchet 2, a swinging mechanism 3, and a pushing mechanism 4. Of these, the feeding mechanism 1 comprises:
The wire rod can be clamped and moved forward, and one end of the main shaft 11 is extended from one side of the main shaft 11, and the main gear 1
3. Packing sleeve 12 and first feed roll 17
and a bearing stand 161 and a bearing stand 162 are provided.
The bearing base 16 also supports a driven shaft 15 in parallel with the main shaft 11, and one end of the driven shaft 15 is provided with a second feed roll 18 which rotates in a manner that corresponds to the first feed roll 17 and is in substantial peripheral contact with the first feed roll 18. The other end of the driven shaft 15 is provided with a driven gear 19 which is in mesh with the driving gear 13, and a friction drum 10 is fixed adjacent to the driving gear 13, as shown in FIG.
The friction drum 10 is provided with a brake band 101 and a tension spring 102 for applying tension to the brake band 101, thereby providing an appropriate amount of elastic braking to prevent the friction drum 10 or the entire main shaft 11 system from rotating more than expected due to inertia.

The ratchet 2 has ratchet teeth 21 formed along its periphery, and its center is fitted externally around the main shaft 11 so as to be rotatable together with the main shaft 11. The ratchet 2 is secured to the packing sleeve 11 by a plurality of bolts 22.
The nut 23 is screwed to the two end edges of the main shaft 11.
The swing mechanism 3 comprises a swing arm 31 pivotally supported on the side of the ratchet 2 facing the machine base so as to be slidable relative to the packing sleeve 12 of the main shaft 11, and a reciprocating push rod 32 connected to the bottom of the swing arm 31.
The reciprocating push rod 3 is provided with a crank mechanism (not shown).
11, a mounting portion 33 is provided at one end of the upper end of the swing mechanism 3, and the pushing rod 32 is attached to the bottom of the lower end of the swing mechanism 3.
A connecting portion 34 is formed to connect to the above.

The pushing mechanism 4 comprises a ratchet pawl 42 fixed to a wedge-shaped seat 41 and an elastic contact device 43. The wedge-shaped seat 41 is pivotally supported by a shaft pin 44 in the mounting portion 33 at one end of the swing arm 31. The forward-facing inclined surface 411 of the wedge-shaped seat 41 is
A ratchet pawl 42 is fixed to the wedge-shaped seat 41 so as to extend outward from the front end of the ratchet pawl 42, and the tip of the ratchet pawl 42 is made to abut against the ratchet teeth 21 on the periphery of the ratchet 2. A bracket 45 is fixed to the forward-facing inclined surface of the upper end of the swing arm 31 so as to face the ratchet pawl 42 of the wedge-shaped seat 41 with an appropriate gap therebetween. An elastic abutment device 43 is provided on the bracket 45.
The upper surface of the ratchet pawl 42 is constantly pressed and biased by the force, and the ratchet pawl 42 is constantly pressed against the ratchet teeth 21 of the ratchet 2.
The contact surface should be in contact with the surface of the

As can be seen from both FIGS. 8 and 9, when the swing mechanism 3 is first interlocked, the push rod 32 interlocks the swing arm 31 connected thereto, and the push mechanism 4 mounted on the swing arm 31 also swings in synchronization with the swing mechanism 3. At this time, the ratchet pawl 42 of the push mechanism 4
The ratchet teeth 21 push forward against the tooth surfaces of the ratchet teeth 21, pushing and rotating the ratchet 2. When the ratchet 2 rotates, the main shaft 11, to which the central part is externally connected, also rotates, and the rotation of the main shaft 11 rotates the main gear 13 and the first feed roll 17 in conjunction with each other. The driven gear 19, which is provided on the driven shaft 15 and meshes with the main gear 13, and the second feed roll 18 corresponding to the first feed roll 17 also rotate accordingly, and the wire is clamped by the corresponding grooves formed on the periphery of the first feed roll 17 and the second feed roll 18, and is transported to the processing operation.

When the ratchet 2 is pushed and rotated by a predetermined angle, the swing mechanism 3 always pulls the ratchet pawl 42 back to its original starting point to perform the next wire clamping and transporting operation. At this time, the ratchet pawl 42 is always in contact with the ratchet teeth 21 of the ratchet 2 due to the contact bias of the elastic contact device 43, so that the front end of the ratchet pawl 42 contacts the ratchet teeth 21 of the ratchet 2 during the return process.
The ratchet 2 and ratchet pawl 42 rub against each other, generating impact friction noise. This phenomenon not only generates noise during operation, but also causes the ratchet 2 and ratchet pawl 42 to wear out easily due to long-term impact friction, shortening their service life. Furthermore, because the ratchet 2 is moderately braked by the friction drum 10 on the main shaft, the swing arm 31 must overcome the braking force to perform the feeding operation. After long-term use, the brake band 101 and tension spring 102 of the friction drum 10 inevitably lose their original effectiveness due to elastic fatigue. Furthermore, the installation of this type of friction drum 10 does not completely prevent the ratchet 2 from bouncing back and forth, and the additional space and complexity of the components are also highlighted as problems.

[0007]

In view of the problems with the ratchet pawl in the conventional wire feed mechanism described above, the object of the present invention is to provide a ratchet pawl push-up device for a wire feed mechanism which can push up the ratchet pawl during the return process, thereby avoiding impact friction with the ratchet teeth, preventing noise and wear, and which can also form an independent control mechanism for the driven arm to ensure the accuracy of the operation of the wire feed mechanism.

[0008]

[Means for Solving the Problem] In order to achieve the above object, the present invention provides a feeding mechanism which has a main shaft and an interlocking device and pushes and feeds a wire rod, a ratchet which has ratchet teeth along its periphery and whose central part is fitted and connected to the periphery of the main shaft, a swing mechanism which has a swing arm which is provided on the side of the ratchet facing the machine base so as to be able to slide relative to the main shaft, and a reciprocating pushing rod which is connected to the swing arm and swings it back and forth, and a ratchet pawl which is pivotally supported by a shaft pin and an elastic contact device which is attached to the swing arm,
A ratchet pawl push-up device for a wire rod feeding mechanism, comprising: an elastic abutment device that elastically biases the ratchet pawl to abut against the ratchet teeth of the ratchet; and a pushing mechanism that intermittently rotates the ratchet when the swing arm swings back and forth; a driven arm that is pivoted around the main shaft in contact with the outward side surface of the swing arm; and a kick hole that is struck and pushed by the head portion of the shaft pin at the upper end of the driven arm;
An abutment portion is formed that pushes the ratchet pawl, which has extended to a position almost facing the ratchet teeth, upward from below toward the tip of the ratchet teeth, and during the return stroke following the feed operation of the swing arm of the swing mechanism, the head portion of the shaft pin collides with the inner periphery of the kick hole and pushes the driven arm, causing the abutment portion to push up the ratchet pawl.

A hollow pivot boss is provided along the outer peripheral edge of the pivot hole pivotally mounted around the main shaft of the driven arm, and an elastic brake mechanism is provided around the outer peripheral surface of the pivot boss. The other end of the elastic brake mechanism is fixed to the machine base, and the elastic brake mechanism is provided with braking means for elastically tightening the outer peripheral wall of the pivot boss. The elastic brake mechanism includes first and second brake pieces, each of which is semicircular and forms a clamping ring. Each brake piece is provided with a corresponding braking means, and the brake pieces are It is even more preferable if one end of each brake piece is pivotally attached to a support seat mounted on the same machine base, the other end of each brake piece that is not pivoted is fixed by an adjustment means, the bolt of the adjustment means is inserted through the other end of each brake piece that is not pivoted, and a spring means is attached to the end of the bolt extending from the second brake piece and a nut is screwed onto it, so that when the two brake pieces are clamped against the pivot boss of the driven arm by the elastic brake mechanism assembled in this way, the nut screwed onto the adjustment means can be appropriately screwed in, thereby making it possible to control the degree of clamping against the pivot boss.

The present invention achieved as described above provides an "idle stroke" in which, when the swing arm swings back and forth, the shaft pin does not come into contact with the peripheral wall of the kick hole and does not engage the driven arm.
The pivot pin then abuts against the kick hole circumferential wall, performing an "interlocking stroke" that interlocks the driven arm, and the pivoted ratchet pawl is brought into contact with the ratchet teeth downward due to the time difference caused by the displacement of the pivot pin as it moves within the kick hole.
[0003] When the swing arm is driven, the ratchet pawl pushes and rotates the ratchet, simultaneously moving the driven arm. When the ratchet pushes and rotates to a predetermined angle, the pivot pin first performs an "idle stroke" within the kick hole. Then, due to the time difference caused by the displacement caused by this movement, the ratchet pawl pivotally connected to the swing arm is pushed up by the abutment support action of the abutment portion and released from contact with the ratchet teeth, preventing the ratchet pawl from experiencing impact friction with the ratchet teeth during its return process. Furthermore, since both brake pieces of the brake seat respectively hold and clamp the pivot bosses of the driven arm, the clamping gap between the spring means and the other ends of the two brake pieces not pivotally connected to the brake seat can be adjusted by appropriately screwing in the nuts of the adjustment means, and the degree of tightness with which the clamping ring of the brake seat holds and clamps the pivot boss of the driven arm of the braking means can be appropriately controlled.

[0011]

1 and 2, a relatively preferred embodiment of the ratchet pawl push-up device in a wire rod feeding mechanism of the present invention mainly comprises a feeding mechanism 5, a swinging mechanism 6, a ratchet 7, a pushing mechanism 8, a driven arm 9, and a brake seat 91, the main characteristic structures of which differ from the prior art are as follows:

The feed mechanism 5 is almost similar to the above-mentioned prior art, but differs in that it does not include the friction drum 10 and other related belts and tightening control devices provided in the prior art, and instead provides a check means around one end 54 of the main shaft 51 of the first feed roll 57, in contact with the side of the first feed roll 57 facing the machine base. In this embodiment, the check means is formed by a one-way bearing 50, which is positioned between the main shaft 51 and the bearing base on which the main shaft 51 is supported. The one-way bearing 50 prevents the main shaft 51 of the feed mechanism 5 from reversing, allowing the main shaft 51 to rotate in one direction at all times.

The swing mechanism 6 has a mounting portion 63 formed at one end of the upper end of the swing arm 61, with a bore 65 provided in the mounting portion 63, and a shaft pin 66 is inserted into the bore 65 so that its tip projects outward. The ratchet 7 has ratchet teeth 71 formed around its periphery as in the prior art, and its central portion is externally fitted and connected around the main shaft 51 so as to be rotatable together with it, and is screwed by a plurality of bolts onto the edge of a packing sleeve 52 fitted and locked around the body of the main shaft 51.

The pushing mechanism 8 comprises a wedge-shaped seat 81, a ratchet pawl 82 fixed to the wedge-shaped seat 81, and an elastic abutment device 83. The structure and installation of the wedge-shaped seat 81 and the elastic abutment device 83 are the same as those of the prior art, so a description thereof will be omitted here. The ratchet pawl 82 attached to the wedge-shaped seat 81 has a protrusion 821 formed on the side of the inclined surface 811 of the wedge-shaped seat 81.

The driven arm 9 is pivotally mounted around the main shaft 51 in contact with the outward side of the ratchet 7 of the swing arm 61, and has a kick hole 92 with a large diameter (which may be an appropriately long hole diameter) at its upper end, that is, the diameter of the kick hole 92 is formed so as to be longer than the diameter of the shaft pin 66 at least in the direction of swinging in an arc about the main shaft 51,
The pivot pin 66 of the swing arm 61 is inserted so that its pin head can move and displace appropriately within the kick hole 92, and a contact portion 93 is provided at an appropriate position on the side of the driven arm 9 corresponding to the bottom surface of the side edge protrusion 821 of the ratchet pawl 82 of the pushing mechanism 8, and the contact portion 93 is abutted and supported by the bottom surface of the protrusion 821 on the side of the ratchet pawl 82 extending toward the front end on the wedge-shaped seat 81. A pivot boss 901 is provided along the outward peripheral edge of the pivot hole 90 of the driven arm 9 pivoted around the main shaft 51, and the pivot boss 901 is rotatably pivoted around the main shaft 51 of the feed mechanism 5, and the pivoting method is such that a pair of bearings 902 are connected at an appropriate interval between the main shaft 51 and the pivot boss 90
1, allowing the main shaft 51 and the pivot boss 901 to rotate relative to each other, and both bearings 902 are fixed by C-clamps 903, respectively.

As shown in FIGS. 1 and 3, the brake seat 91 is an elastic brake mechanism.
The brake pieces 911 and 912 are
The brake pieces 911 and 912 are each semicircular and together form a clamping ring 603. Each brake piece 911 and 912 is provided with a corresponding braking means 914, for example, in the form of a lining.
15 are pivotally mounted on a support seat A installed on the machine base, and the other end 9 of each of the brake pieces 911 and 912, which is not pivotally connected, is
16 is fixed by the adjusting means 917.
The bolt 918 is inserted through the other end 916 of both brake pieces 911 and 912, which is not pivotally connected, and the spring means 918 is attached to the end of the bolt 918 extending from the second brake piece 912.
19 and screw nuts 910 into place. Then, the brake seat 91 assembled in this way secures both brake pieces 91
The degree of fastening of the clamping ring 913 can be adjusted appropriately by adjusting the distance between the other end 916 of the clamping rings 912 that is not pivotally connected.

When the present invention constructed as described above is used, the swing arm 6 is
When the kick hole 9 is rotated back and forth, the pivot pin 66 is
2, and the stroke of this movement includes an "idle stroke" in which the pivot pin 66 does not abut against the circumferential wall of the kick hole 92 and does not engage the driven arm 9, as shown in FIG. 4, and an "engagement stroke" in which the pivot pin 66 abuts against the circumferential wall of the kick hole 92 and engages the driven arm 9, as shown in FIGS. 5 and 6. In the process of pushing and rotating the ratchet 7, due to the time difference caused by the displacement of the pivot pin 66 when it moves within the kick hole 92, the ratchet pawl 82 abuts against and engages with the ratchet teeth 71 of the ratchet 7 downward as shown in FIG. 7, and the ratchet pawl 82 is driven by the driving of the swing arm 61.
pushes and rotates the ratchet 7, simultaneously interlocking the driven arm 9, and when the ratchet 7 is pushed and moved to a predetermined angle as shown in FIG. 5 and is about to move into the return operation, the shaft pin 66 first performs the "idle stroke" shown in FIG. 4 within the kick hole 92,
Furthermore, due to the time difference caused by the displacement due to the movement, the ratchet pawl 82 pivoted to the swing arm 61 contacts the contact portion 93.
9. The shaft pin 66 is pushed up by the abutting and supporting action of the ratchet teeth 71 and released from the abutment against the ratchet teeth 71. The shaft pin 66 is then moved to the lower end peripheral edge of the kick hole 92, and the driven arm 9
When the ratchet teeth 71 are engaged, the ratchet pawl 82 is released from contact with the ratchet teeth 71 by the pushing up of the contact portion 93 as shown in FIG. 6 and moves back.
3, both brake pieces 911 and 912 of the brake seat 91 correspond to each other and hold the pivot boss 901 of the driven arm 9, so that by appropriately screwing the nut 910 of the adjusting means 917, the spring means 919 can be adjusted to the position where it is attached to the brake seat 9.
The clamping gap between the other end 916 of the two brake pieces 911, 912 that are not pivotally connected to 1 can be adjusted, and the degree of tightness with which the braking means 914 in the clamping ring 913 of the brake seat 91 holds and clamps the pivot boss 901 of the driven arm 9 can be appropriately controlled.

[0018]

As can be seen from the above description, the present invention provides a driven arm with a kick hole and a pivot pin for the swing arm, so that the ratchet pawl supported by the abutment part can be
[0003] Due to the time lag caused by the displacement caused by the movement of the pivot pin within the kick hole, the ratchet pawl is pushed up during the process of the pushing mechanism returning to its original position, avoiding collision and friction with the ratchet, thereby improving the drawback of the prior art where collision and friction between the ratchet pawl and the ratchet causes noise and friction. In addition, by providing a protruding pivot boss on the driven arm, the adjustment means can control the degree of clamping of the braking means of the brake seat against the pivot boss, thereby generating a frictional braking effect on the pivot boss, and this type of independent device that fixes and controls the driven arm by elastic pressing applies its acting force directly to the outer peripheral wall of the pivot boss, preventing the driven arm and the ratchet from coming into contact with each other, preventing the reliability of the overall operation from being affected.

[Brief explanation of the drawings]

1 is a side cross-sectional view of a relatively preferred embodiment of the present invention;

FIG. 2 is an exploded view of the swing mechanism, the pushing mechanism, and the driven arm of the embodiment.

3 is a partial cross-sectional side view of the right side of FIG. 1. FIG.

[Figure 4] This is a right-side view showing the ratchet, swing mechanism, pushing mechanism and driven plate shown in Figure 2 assembled together, and the state in which the shaft pin is performing an "idling stroke" within the kick hole.

5 is a diagram showing a state in which the pivot pin is performing an "interlocking stroke" within the displacement hole when the swing mechanism in FIG. 4 is pushed forward.

6 is a diagram showing the state in which the pivot pin in FIG. 4 is performing the "interlock stroke" in the kick hole when the swing mechanism is returning.

7 is a diagram showing the state in which the pivot pin is performing an "idling stroke" within the kick hole when the rocking mechanism in FIG. 4 returns and the ratchet pawl is about to abut and mesh with the ratchet teeth again.

FIG. 8 is a cross-sectional view of a conventional wire rod feeding mechanism as viewed from the front end side.

9 is a right side view of FIG. 1, showing an assembled state of the ratchet, the swing mechanism, and the pushing mechanism in the wire rod feeding mechanism. FIG.

FIG. 10 is a structural diagram of a friction ring in a conventional wire rod feeding mechanism.

FIG. 11 is an exploded view of a ratchet, a swing mechanism, and a pushing mechanism in a conventional wire rod feeding mechanism.

[Explanation of symbols]

5 Feed mechanism 51 Main shaft 6 Oscillating mechanism 61 Oscillating arm 62 Reciprocating oscillating rod 66 Axle pin 7 Ratchet 71 Ratchet teeth 8 Push mechanism 82 Ratchet pawl 83 Elastic contact device 9 Follower arm 90 Pivot hole 901 Pivot boss 91 Brake seat 910 Nut 911 First brake piece 912 Second brake piece 913 Clamping ring 914 Braking means 917 Adjusting means 918 Bolt 919 Spring means 92 Kick hole 93 Contact portion A Support seat

Claims (3)

(57) [Claims] [Claim 1] A feeding mechanism having a main shaft and an interlocking device for pushing and feeding a wire rod, a ratchet having ratchet teeth provided along its periphery and having its central portion externally fitted and connected around the main shaft, a swinging mechanism having a swinging arm provided on the side of the ratchet facing the machine base so as to be able to slide relative to the main shaft, and a reciprocating pushing rod connected to the swinging arm for swinging back and forth,
a ratchet pawl push-up device for a wire rod feeding mechanism, the ratchet pawl push-up device being provided with a ratchet pawl pivoted by a shaft pin and an elastic abutment device attached to the swing arm, the elastic abutment device elastically biasing the ratchet pawl to bring it into contact with the ratchet teeth of the ratchet, and the ratchet intermittently rotating when the swing arm swings back and forth, a driven arm pivotally mounted around the main shaft in contact with the outward side surface of the swing arm, and a kick hole formed at the upper end of the driven arm to be struck and pushed by the head portion of the pivot pin, forming a contact portion that thrusts the ratchet pawl, which has extended to a position substantially facing the ratchet teeth, from below upward toward the tip of the ratchet teeth; and during the return stroke following the feeding operation of the swing arm of the swing mechanism, the head portion of the pivot pin collides with the inner periphery of the kick hole to push the driven arm, and the contact portion thrusts up the ratchet pawl. [Claim 2] A ratchet pawl push-up device in a wire feed mechanism as described in claim 1, wherein a hollow pivot boss is protruding along the outward peripheral edge of a pivot hole pivotally attached to the main shaft of the driven arm, an elastic brake mechanism is provided around the outer peripheral surface of the pivot boss, the other end of the elastic brake mechanism is fixed to the machine base, and braking means is provided for elastically tightening the outer peripheral wall of the pivot boss to the elastic brake mechanism. [Claim 3] The elastic brake mechanism includes a first brake piece and a second brake piece, each of which is semicircular and forms a clamping ring, each brake piece being provided with a corresponding braking means, one end of each of which is pivotally attached to a support seat mounted on the same machine base, and the other end of each of which is not pivotally attached is fixed by an adjusting means, and a bolt of the adjusting means is inserted through the other end of each of which is not pivotally attached,
3. The ratchet pawl push-up device in a wire rod feeding mechanism according to claim 2, wherein a spring means is provided around the end of the bolt extending from the brake piece of the bolt, and a nut is screwed onto the end of the bolt, so that when the brake pieces clamp the pivot boss of the driven arm by the elastic brake mechanism thus assembled, the nut screwed onto the adjustment means is appropriately turned, thereby making it possible to control the degree of clamping of the pivot boss.