GB2379671A

GB2379671A - Apparatus for finishing the winding of a golf ball

Info

Publication number: GB2379671A
Application number: GB0228323A
Authority: GB
Inventors: Hideki Sano; Takayuki Saimen
Original assignee: Sumitomo Rubber Industries Ltd
Current assignee: Sumitomo Rubber Industries Ltd
Priority date: 1999-02-01
Filing date: 2000-01-24
Publication date: 2003-03-19
Anticipated expiration: 2020-01-24
Also published as: GB2379671B; GB0228323D0

Abstract

An apparatus for finishing off the winding of a golf ball comprises a pair of shafts 31, 32 between which the wound core is received after winding has been carried out, a needle 30 with a hook 41 and latch 43 and a string deflection lever 28. The needle is advanced alongside the core so that additional windings 82 are formed around the needle and core, the string is deflected into the needle hook by the lever 28, the needle is withdrawn to pull the string 83 under the windings 82 where it is trapped, the string is severed and the needle is then advanced and withdrawn again to release the string. The apparatus may be mounted on a turntable, next to an apparatus for starting the winding of the core, which services a series of winding stations arranged at fixed positions around the turntable.

Description

APPARATUS AND METHOD FOR MANUFACTURING GOLF BALL This invention relates to a golf ball apparatus and method for obtaining a wound string core by winding a string, made of rubber, on a core.

A golf ball which comprises a wound string core is conventionally manufactured by the method below. A string, made of rubber, is wound on a core to form a wound string core, and the core is covered to form the golf ball. The core to be string wound is made of a solid rubber or formed by filling liquid or paste material into a rubber bag.

The method described blow-for winding a string, made of rubber, on a core or a center is widely adopted. First, the core is held by string winding rollers, and at least one of the rollers is driven to rotate, thus the core is being rotated while providing the string to a surface of the core, thereby the string is wound on the core.

At the start of string winding, the starting end of the string is needed to be fixed to the core, and at the end of the winding process, the wound end of the string is needed to be fastened. A string winding apparatus for automatically treating the string starting end and the wound string end is disclosed in Japanese Patent Publication No. 5-10959.

This conventional string winding apparatus comprises winding devices which are provided in a circle, and an arm for treating the string starting end and the wound string end provided on a movable table located in an inner area of the circle of the winding devices. The arm is arranged to face each of the winding devices and treat the string starting end and the wound string end in respect of each device sequentially.

In the conventional string winding apparatus, the construction of the arm is complicated and movements of the devices are also complicated, and therefore the speeding up of the device movement is limited. Furthermore the one arm operates both treatments of the string starting end and the wound string end in respect of each device, and the time required to finish the treatments in respect of each device takes long and the operation efficiency is lowered. Moreover, a freezing means to keep cores (liquid centers) frozen is provided to each winding device, and as a result, the whole apparatus is a large- sized apparatus.

The present invention sets out to provide apparatus and a method for manufacturing a golf ball wherein ball construction is simplified and operation efficiency is increased.

Accordingly, a first aspect of the invention provides golf ball manufacturing apparatus as set out in Claim 1. Preferred features of this aspect of the invention are set out in Claim 2. According to a second aspect of the invention there is provided a method of manufacturing a golf ball as set out in Claim 3.

The present invention will be described with reference to the accompanying drawings, in which: Figure 1 is a configuration explanatory view showing an embodiment of an apparatus for manufacturing a golf ball according to the present invention; Figure 2 is a schematic explanatory view showing one of the string winding means and a treatment means of string starting end; Figure 3 is a perspective view of a principal portion showing a clamp of the treatment means of string starting end ; Figure 4 is a schematic explanatory view showing one of the string winding means and a treatment means of wound string end; Figure 5 is a perspective view of a principal portion showing a clamp of the treatment means of wound string end; Figure 6 is a side view of a principal portion showing a path changing lever and a reciprocation mechanism; Figure 7 is a side view of a principal portion showing a string cutting means; Figure 8 is an enlarged side view of a principal portion showing a needle including a hook and a latch ; Figure 9A is a working explanatory view showing a state that the latch is opened by raising the latch by a latch raising up portion;

-ae that the Figure 9B is a working explanatory view showing a state that the

latch is opened by raising the latch by the latch raising up portion; Figure 10 is an explanatory view showing positions of string winding rollers, tension rollers and a chuck; Figure 11A is a working explanatory view showing a step of winding string starting end; Figure 118 is a working explanatory view showing a step of winding string starting end; Figure 11C is a working explanatory view showing a step of winding string starting end; Figure 11D is a working explanatory view showing a step of winding string starting end ; Figure 12 is an explanatory view showing a state that tension is applied to a string by tension rollers ; Figure 13A is a working explanatory view showing a state the clamp is separated from the core; Figure 13B is a working explanatory view showing a state the clamp is separated from the core; Figure 14A is an explanatory view showing a state the string and the core are held only by string winding rollers ; Figure 14B is an explanatory view showing a state the string and the core are held only by the string winding rollers ; Figure 15 is an explanatory view showing a state a winding process is finished ;

Figure 16A is a working explanatory view showing a state the clamp of the treatment means of string starting end is holding a wound string core; Figure 16B is a working explanatory view showing a state the clamp of the treatment means of wound string end is holding the wound string core; Figure 17 is a first explanatory view showing a step of treatment of wound string end; Figure 18 is a second explanatory view showing a step of treatment of wound string end; Figure 19 is a third explanatory view showing a step of treatment of wound string end; Figure 20 is a forth explanatory view showing a step of treatment of wound string end; Figure 21 is a fifth explanatory view showing a step of treatment of wound string end; Figure 22 is a sixth explanatory view showing a step of treatment of wound string end; and Figure 23 is a seventh explanatory view showing a step of treatment of wound string end.

Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

Figure 1 is a top view for explanation of a configuration of an apparatus for manufacturing a golf ball according to the present invention. The apparatus is for winding a string, made of rubber, on a core to form a wound string core. The apparatus is provided with a plurality of string winding means 1 each of which is for winding a string on a core, a treatment means 2 of string starting end which winds to fix a starting end of the string to the core, a treatment means 3 of wound string end which fastens an end of the wound string core at the end of the winding process, and a core providing means 4 for providing the core to the treatment means 2.

The core to be string-wound mentioned above includes a core formed by filling liquid or paste material into a bag made of rubber, that is a liquid center, or a core made of a sol id rubber, that is a solid center.

As shown in Figures 1,2 and 4, a plurality of string winding means (devices) 1 are provided in a circle at regular intervals. In an inner area N of the plurality of string winding means 1, the treatment means (device) 2 of string starting end, the treatment means (device) 3 of wound string end, and the core providing means (device) 4 are provided.

The treatment means 2 is arranged to face one of the string winding means 1 and the treatment means 3 is arranged to face one of the string winding means 1. The string winding means 1 are provided to be

contiguous to one another. The treatment means 3 is located ahead of the treatment means 2 in the direction of proceeding.

A turntable 5 is provided in the inner area N, and on the turntable 5. the treatment means 2, the treatment means 3 and the the core providing means 4 are provided. The turntable 5 rotates intermittently in the direction of arrow A, thus the treatment means 2 and the treatment means 3 are intermittently shifted in a circumferential direction in the inner area N and the treatment means 2 and the treatment means 3 respectively treat a string starting end and a wound string end of each of the string winding means 1 sequentially.

As shown in Figure 1, the core providing means 4 is provided with a first storage portion 6 which stocks cores in frozen state, a second storage portion 7 which stocks cores in non-frozen state, and a core feeding portion 8 (such as a rotary feeder) provided on a passage 9 for providing core. The passage 9 is provided between the first and second storage portions 6 and 7, and the treatment means 2. Either one of the first storage portion 6 or the second storage portion 7 is selected and arranged to communicate with the core feeding port ion 8 to provide cores, which are frozen or not frozen, to the treatment means 2 one by one.

In the passage 9 between the first storage portion 6 and the treatment means 2. antifreezing heater (not shown) for the passage is provided. Therefore the passage is heated and a problem described

below is solved. When frozen cores (liquid centers) pass the passage 9, the passage 9 is cooled, and thereby the cores could stick in the middle of the passage 9.

However, as the passage is heated by the heater, the cores will not stick in the passage 9.

Next, the treatment means 2 of string starting end is described.

As shown in Figures 2 and 3, the treatment means 2 is provided with a clamp 10 for holding a core B, a moving mechanism 11 (a robot arm, for example) to move the clamp in two dimensional direction or in three dimensional direction. The clamp 10 is provided with a holding shaft 14 to be driven to rotate having a holding needle 13 for holding down a starting end 12 of a string G on the core B, a pressing shaft 15 rotatably provided to be facing to the holding shaft 14 and holding the core B between the holding shaft 14 and the pressing shaft 15, and a clamp reciprocation mechanism 16 for moving the holding shaft 14 and the pressing shaft 15 to be close to or apart from each other.

To be specific, a box 17 is the box which a driving portion 18 (such as a motor) for rotating the holding shaft 14, and a driving portion 19 (such as a cylinder) of the clamp reciprocation mechanism 16 are built into. The holding shaft 14 protrudes substantially into horizontal direction from a side wall 17a of the box 17 as to rotate.

On end 14a side of the holding shaft 14, the holding needle 13 is provided through an opening and closing mechanism 20 for oscillation.

The mechanism 20 comprises an oscillating attaching piece 21 which is

attached to the shaft 14 and which the needle 13 is provided at the end side of the piece 21, a pinion gear 22, a rack member 23 which is for engaging with the pinion gear 22 and provided in the holding shaft 14 as to move forward and backward, a rack reciprocation mechanism (not shown) for reciprocating the rack member 23. The rack member 23 is reciprocated to turn the pinion gear 22, and thus the needle 13 is oscillated to hold and release through the oscillating attaching piece

21.

The clamp reciprocation mechanism 16 comprises an extension arm 24, which is L-shape, or J-shape, protruded substantially into horizontal direction from a side wall 17a of the box 17 as to move back and forth, the driving means 19 for reciprocating the extension arm 24, and a boss 25 provided at the end of the extension arm 24. The pressing shaft 15 is held in the boss 25 through a bearing for example, as to freely rotate. A surface of the holding shaft 14 and a surface of the pressing shaft 15 are facing each other and each of the surfaces is formed to be concavely curved surface, or a spherical surface.

Next, as shown in Figures 4 to 7, the treatment means of wound string end 3 comprises a clamp 26 for holding a wound string core C, a moving mechanism 27 (a robot arm, for example) to move the clamp 26 in two dimensional direction or in three dimensional direction, a path changing lever 28 provided to the clamp 26, and a string cutting means 29 provided to the clamp 26.

Specifically, as shown In Figure 5, the clamp 26 is provided with a holding shaft 31 to be driven to rotate having a needle 30 for fastening a wound string end. a pressing shaft 32 provided to be facing to the holding shaft 31 and holding the wound string core C with the holding shaft 31, a clamp reciprocation mechanism 33 for moving the holding shaft 31 and the pressing shaft 32 to be close to or apart from each other, and a needle reciprocation mechanism 34 driven to move the needle 30 back and forth.

A box 35 is the box which 3 driving portion 36 (such as a motor) for rotating the holding shaft 31, and a driving portion 37 (such as a cylinder) of the clamp reciprocation mechanism 33 are built into. The holding shaft 31 is protruding substantially into horizontal direction from a side wall 35a of the box 35 as to rotate. A slide block 38 is fit on the outer circumference surface of the holding shaft 31 through a sliding key, as to slide axially and rotate with the holding portion 31. The needle 30 is fit to the slide block 38 as to be substantially pari-ilex with the holding shaft 31. The needle reciprocation mechanism 34 is provided between the slide block 38 and the box 35. In this embodiment, the needle reciprocation mechanism 34 is a miniature cylinder of which main body portion is fit on an outer disk portion 31a on the base side of the holding shaft 31, and a rod end is fit into the slide block 38 so that the mechanism 34 rotates with the holding shaft 31. However the needle reciprocation mechanism 34 may be arranged as

that the main body portion of the miniature cylinder is fixed to the box 35 and the rod end is slidably fit in a concave groove provided in the slide block 38 so that the miniature cylinder does not interfere with the rotation of the slide block 38.

The clamp reciprocation mechanism 33 comprises an extension arm 39, which is L-shape, or J-shape, protruding substantially into horizontal direction from a side wall 35a of the box 35 as to move back and forth, the driving means 37 for reciprocating the extension arm 39, and a boss 40 provided at the end of the extension arm 39. The pressing shaft 32 is held in the boss 40 through a bearing, for example, as to freely rotate. A surface of the holding shaft 31 and a surface of the pressing shaft 32 are facing each other and each of the surfaces is formed to be concavely curved surface, or a spherical surface.

Referring to Figure 8, the needle 30 has a hook 41 which hitches a string and provided at an end of the needle 30, and a latch 43 which is attached on the base portion of the hook through an attachment pin 42 as to be freely oscillated to open and close. When the latch 43 is closed, it forms a loop with the hook 41. In this situation, the tip end of the latch 43 is arranged to protrude from the end of the hook 41 by a slight protruding length T.

To be specific, as shown in Figures 9A and 9B, when the needle 30 passes through under a latch raising portion 44 made of an elastic body, the tip end of the latch 43. which is closed, is caught by a lower end

of the latch raising portion 44, and as the needle proceeds further, the latch portion 43 is widely opened. The latch raising portion 44 is fit to an adequate position adjacent to the boss 40 of the extension arm 39 of the clamp 26 through a fitting member, for example. Showing in Figure 4 to Figure 6, the path changing lever 28 is provided to the fitting frame 45 provided on the upper face of the box 35 of the clamp 26 as to be oscillated. The lever 28 comprises an oscillating rod 48 of which upper end is fit to a fitting portion 47 protruding from a

vertical wall 46 of the frame 45 to the holding shaft 31 side. an operating portion 49 which is L-shaped and provided at the lower end of the oscillating rod 48, and a sliding portion 50 which is a discoid and provided in the middle of the whole length of the rod 48. The lever 28 is oscillated to reciprocate toward the end of the holding shaft 31 in the direction of arrow Y by a reciprocation mechanism 51 described below.

The lever 28 is provided between the holding shaft 31 and the extension arm 39 as seen in a top view.

The reciprocation mechanism 51 is held by the vertical wall 46 of the frame 45, and comprises a cylinder 53 of which end of a rod 52 contacts the sliding portion 50 of the lever 28, and an elastic member 54 such as a coil spring, of which one end is fit to the vertical wall 46 and the other end is fit to the oscillating rod 48 and continuously pushing the sliding portion 50 toward the rod 52 side. As the cylinder 53 is driven to extend, the rod 52 presses the sliding portion 50 and

thereby the oscillating rod 48 and the operation portion 49 are oscillated to the holding shaft 31 side in the direction of arrow Y.

At the same time. the operation portion 49 contacts an wound end portion of the string G of the wound string core C to move the position. and this process is described specifically below.

Next. as shown in Figure 7, a string cutting means 29 is attached to the frame 45 together with the path changing lever 28 side by side.

The cutting means 29 comprises a first oscillating rod 55 of which upper end is attached to the fitting portion 47 of the frame 45. a second oscillating rod 56 provided to be parallel with the first oscillating rod 55, an electric heating portion 57 provided on a lower connecting portion of the first oscillating rod 55 and the second oscillating rod 56. a sliding portion 58 which is a discoid and provided in the middle of the whole length of the first rod 55. and a reciprocation mechanism 59 which reciprocates the first rod 55 and the second rod 56 toward the end of the holding shaft 31, in the direction of arrow Y. As the lever 28 is provided, the first oscillating rod 55 and the second oscillating rod 56 are also provided between the holding shaft 31 and the extension arm 39 of the clamp 26 as seen in a top view (See Figure 5).

The reciprocation mechanism 59 is held by the vertical wall 46 of the frame 45. and comprises a cylinder 61 of which end of a rod 60 contacts the sliding portion 58 of the first rod 55, and an elastic

member 62 such as a coil spring, of which one end is fit to the vertical wall 46 of the frame 45 and the other end is fit to the first oscillating rod 55 and continuously pushing the sliding portion 58 toward the rod 60 side. As the cylinder 61 is driven to extend, the rod 60 presses the sliding portion 58 and thereby the first and second oscillating rods 55 and 56 and the electric heating portion 57 are oscillated to the holding shaft 31 side, in the direction of arrow Y.

Then the electric heating portion 57 which is heated cut a wound end portion of a string G of a wound string core C, and this process is described specifically below.

Next, as shown in Figures 2, 4 and 10, the string winding means 1 comprises a main body portion 63, upper and lower string winding rollers 65 provided on an inner side wall 64 side of the main body portion 63. and tension rollers 66 provided as to rotate on the inner side wall 64 side of the main body portion 63.

The upper and lower string winding rollers 65 include a pair of upper rollers 65a, and a pair of lower rollers 65b each of which has a greater diameter than that of each upper roller 65a. The pair of lower rollers 65b are arranged to reciprocate in the axial direction and the horizontal direction traversing the axis of each roller 65b. and at least one of the lower rollers 65b is driven to rotate.

As shown in Figure 10, a holding pressure adjustment mechanism 68, which is provided adjacent to the rollers 65 and which adjusts an

initial holding pressure of the rollers 65 to hold a core. The adjustment mechanism 68 comprises a receiving base portion 69 provided adjacent to the lower rollers 65, a fitting plate 71 connected to an upper roller holding cover 70 provided under the end of a cylinder 67, an external screw 72 vertically provided to the fitting plate 71. a nut portion 73 for being screwed into the external screw 72, and a contacting member 74, made of elastic material (such as rubber), provided to be united with the nut portion 73.

The tension rollers 66 include two large rollers 66a, and two small rollers 66b. The upper and lower large rollers 66a are provided on the right side (the string winding rollers 65 side) of a string G held to be extended vertically by a chuck 75, described later. The upper and lower small rollers 66b are provided on the left side of the string G.

As shown in Figure 12, the upper large roller 66a and the upper small roller 66b are arranged to move close to each other, and the lower small roller 66b is arranged to move to the lower large roller 66a side. When the tension rollers 66 are moved, tension is applied to the string G. The lower small roller 66b is attached at an end of an oscillating arm 76 as to freely rotate. At a base end of the oscillating arm 76. a piece 76a to be detected is provided, and an adjacent sensor 77 is arranged near the base end of the oscillating arm 76.

Showing in Figures 2 and 10, the golf ball apparatus comprises a

hand 78 for holding and pulling to extend the starting end 12 of the string G, and the chuck 75 for holding the string G extended. The hand 78 has a holding portion 79 which opens and closes freely and moves in a two dimensional direction or a three dimensional direction. The holding portion 79 is lowered to transfer the starting end 12 of the string G to the chuck 75 while holding the starting end 12 which is provided to the string winding apparatus 1 from a string providing means, not shown, through a feeding roller. The chuck 75 has a pair of chuck portions SO which freeiy open and close, and the chuck portions 80 hold to receive the starting end of the extended string G. One of the chuck portions 80 (on the rollers 65 side) is provided with a blade portion 81 for cutting the string.

Each of the string winding portions 1 is provided with the chuck 75 on the inner wall 64 side of the main body portion 63. The hand 78 is provided in the inner area N around which the string winding portions 1 are provided, and the hand 78 moves with the treatment means 2 of string starting end intermittently in a circumferential direction.

Next a method (process) for manufacturing a golf ball is described with reference to the accompanying drawings. As shown in Figure 1, the turn table 5 is intermittently turned, and the treatment means 2 of string starting end makes one rotation to treat each starting end of each string of each string winding means 1 one after another. While the treatment means 2 is working, the treatment means 3 of wound string

end is in waiting state.

Specifically as shown in Figure 2 and Figure 10, the hand 78 holds and pull to extend the starting end 12 of the string G, and the starting end 12 extended is held by the chuck 75. After that, the hand 78 is backed to be apart from the chuck 75. The holding portion 79 of the hand 78 may be provided with a blade portion for cutting a part of the string extending below the holding portion 79 when moving apart from the chuck 75.

Referring to Figure 3, on the treatment means 2 side, the holding shaft 14 and the pressing shaft 15 of the clamp 10 hold the core B.

Cores B are sent from the core providing means 4 one by one, described with reference to Figure 1. through the passage 9, and each core B stopped at the end of the passage 9 is held with the clamp 10.

After that, as shown in Figures 3 and 11A, the clamp 10 holding the core B is moved to be close to the extended string G. In this process, the holding needle 13 of the holding shaft 14 is in the released state, and the clamp 10 is stopped at a position where the string G comes between the released needle 13 and the core B.

Then as shown in Figures 3 and 11B, the needle 13 is oscillated to be close state by the opening and closing mechanism 20 for oscillation so that the needle 13 holds and presses down the starting end 12 or the adjacent end portion of the string to the core B.

Next as shown in Figures 3. l1C, 11D and 12. the holding shaft 14

is driven to rotate and thus the core B makes an adequate times of rotations (1-3 times) while moving the clamp 10 to the rollers 65 side.

Because the needle 13 is rotated with the core B, and because of the winding of the string G and the shifting of the clamp 10. the starting end 12 of the string G is pulled to the blade 81 side of the chuck, and the string G is cut by the blade 81.

As shown in Figure 12, as the core B comes between the upper and lower string winding rollers 65, the clamp 10 is lowered to bring the core B in contact with the lower rollers 65b, and the upper rotters 65a are moved down, or moved to the lower rollers 65b side. Thus the upper rollers 65a and the lower rollers 65b hold the core B and the string G.

The contacting member 74 of the holding pressure adjustment mechanism 68 contacts the receiving base portion 69 and the holding pressure of the upper rollers 65a for holding the core B is regulated, and thereby the core B can be held by the upper rollers 65a and lower rollers 65b softly with an adequate holding pressure. That is to say, by holding the core B with the adequate holding pressure, the core B is prevented from being deformed on the initial stage of the string winding process. The holding pressure adjustment mechanism 68 can adjust the holding pressure of the rollers easily by rotating the contacting member 74 to screw the nut portion 73 into upward and downward the external screw 72. The tension rollers 66 are moved, and the pairs of large roller 66a and the small roller 66b pull the string

G to extend, and tension is applied to the string G. The oscillating arm 76 is oscillated and the piece 76a at the base end of the arm 76 is moved to be adjacent to the sensor 77.

In Figure 13A, the clamp 10 is holding the core B with the upper and lower rollers, not shown. Then the holding shaft 14 and the pressing shaft 15 are moved to be apart from each other as shown in Figure 13B, and the needle 13 is moved back to be pulled out from the starting portion of the wound string G on the core B. And the core B and the string G are held only by the upper and lower rollers 65. The clamp 10 is moved back to a position apart from the string winding rollers 65.

As described above, the treatment of starting end of the string G is completed, i. e. preparation for the next process, string winding process, is completed, then the lower rollers 65b of the string winding rollers 65 are driven to rotate and the core B makes rotations to wind the string G on the core B while supplying the string G to the surface of the core B. When the string runs out, or snaps off to suspend the supply of the string G, the small roller 66b provided at the end of the oscillating arm 76, applying tension to the string G, is slightly oscillated down in the direction of arrow D, and thus the piece 76a provided on the base end of the arm 76 is detected by the adjacent sensor 77. The sensor 77 send signals to stop the driving rotter (tower ra ! ! er 65b) of the string winding rotters 65.

Now referring to Figure 1 again, after receiving the core from the treatment means 2, each string winding means 1 starts the winding process. When the treatment means 2 is at the position facing to the last string winding means 1 to treat the string starting end, the treatment means 3 of wound string end is at the position facing to the first string winding means 1 to treat the wound string end. That is to say, while the treatment means 2 is making one rotation on the inner area N, string winding process of each winding means 1 is arranged to be finished. in this embodiment. twelve string winding means 1 are shown. and the turn table 5 makes one round in two minutes.

Next the process of treating the wound string end is described.

Figure 15 is a view showing a completed state of such winding process that the core B is held and rotated by the upper and lower rollers 65 to wind the string on the core B white the string G is being supplied to the surface of the core B. When the upper rollers 65a holding the wound string core C are moved up to the predetermined position, it means that the predetermined amount of the string is wound on the core B, and the lower roller 65, which is driven to rotate, is stopped and the winding process is automatically finished.

When the winding process is finished, as shown in Figure 4. the clamp 26 of the treatment means 3 which is at the position apart from the string winding means 1 is moved to the string winding means 1 side.

Then as shown in Figures 16A, the clamp 26. which is released, comes

close to the the wound string core C held by string winding rollers, not shown. Then as shown in Figure 168. the holding shaft 31 and the pressing shaft 32. facing each other, are moved to be close to each other and hold the string wound core C.

As shown in Figure 16B and Figure 17, the needle reciprocation mechanism 34 pushes the needle 30 forward to the pressing shaft 32 side, so that the needle 30 comes close to the wound string core C. While being pushed to the string core C side, the hook 41 of the needle 30 passes under the string G and as described above with reference to Figure 9, the latch raising portion 44 raises the latch 43.

As the wound string core C is held by the clamp 26. the upper string winding rollers 65 are moved up and the clamp 26 is also moved up a little, so that the wound string core C is separated from the upper and lower string winding rollers 65.

After that, as shown in Figure 18, the holding shaft 31 and the pressing shaft 32 are driven to rotate, thereby the wound string core C makes an adequate times of rotations (1-3 times) to wind the string G around the wound string core C to form additional winding portion 82.

After the rotations are completed, as shown in Figures 6 and 19, the cylinder 53 oscillates the path changing lever 28 to shift the wound end portion 83 of the string G to the hook 41 side so that the end portion 83 is hitched by the hook 41 of the needle 30.

As shown in Figure 20 ; the needle 30 is moved back to pull the end

portion 83 so that the end portion 83 comes under the additional winding portion 82, while hitching the end portion 83 by the hook 41. That is to say, as the needle 30 passes under the additional winding portion 82, the base end of the latch 43 widely opened is hit or touched by the winding portion 82 and the latch 43 is closed to form the loop with the hook 41. Thus the hook 41 is moved back to pull the end portion 83 under the winding portion 82 without being caught by the winding portion 82.

Then as shown in Figure 7 and Figure 20, the first oscillating rod 55 and the second oscillating rod 56 are oscillated to move to the string G side, and the electric heating portion 57, to which an electric current is applied, comes close to or contacts with the string G, and thus the string G is cut as shown in Figure 21. The cut end of the string is the end 84. As shown in Figure 22. the needle 30 is moved forward again and the latch 43 is hit by the end portion 83 and opened.

The opened latch 43 passes through a loop portion formed by the additional winding portion 82 and the wound end portion 83, thereby the needle 30 is arranged to pass above the additional winding portion 82.

After that, as shown in Figure 23, the needle 30 is moved back again and the latch 43 is hit by the end portion 83 and closed. Thereby the hook 41 forming the loop with the latch 43 passes the loop portion of the string smoothly, and the needle 30 goes apart from the wound end portion 83. Accordingly, the the end of the string G is fastened.

After that, the clamp is released, or the holding shaft 31 and the pressing shaft 32 are moved apart from each other, and the wound string core C of which wound string end is treated is removed.

Referring to Figure 1 again, according to the present invention, wound string cores are formed effectively, because the treatment means 3 for fastening the end of the string which is wound around each wound string core obtained by winding the string on each core, and the treatment means 2 for winding the starting end of the string on each core and transferring the core to each string winding means 1 are provided in the inner area N around which the string winding means 1 are provided in a circle at regular intervals, and the treatment means 2 and the treatment means 3 are shifted intermittently in the circumferential direction to operate the string starting end treatment and the wound string end treatment respectively to each of the string winding means 1.

With the method for manufacturing golf ball according to the present invention, as described above with reference to Figure 15, in the process of winding the string G, when the string runs out, or snaps off to suspend the supply of the string G, signals sent from the the adjacent sensor 77 stop the rollers 65 to suspend string winding.

However, the string G is again started to be wound, except a predetermined case.

Before starting to wind the string again on the wound string core C.

the string winding rollers are suspended and the fastening process of the wound string end of the core C is not operated. Then the clamp 10 of the treatment means 2 is moved to the string winding rollers 65 and the clamp 10 takes out the wound string core C from the rollers 65, and treatment of string starting end is operated again, that is a starting end 12 of a string is started to be wound on the core. The core C that the starting end of the string is wound is set between the rollers 65 again and string winding process is started again. Such wound cores are separately sent to the appearance inspection process. To be specific, the wound string cores each of which string is normally wound. and the wound string cores each of which string is once suspended and started to be wound again, are sorted and put into different chutes.

The predetermined case of which string will not be started to be wound again is the case that cores each of which has a liquid center and supply of the string is suspended before passing the predetermined seconds (25 seconds, for example) from the string winding process is started. Such wound string cores are all decided to be defect. In such a short time as 25 seconds from the starting of string winding process, the string can not be equally wound on the core, and each liquid centers thaw as time passes by. therefore such cores are easy to be deformed.

When each of the cores is a liquid center, and in case string supply is suspended between a first predetermined time such as 25

seconds after string winding is started and a second predetermined time such as 40 seconds after string winding is started, it is possible to start winding string on the core again if the rewinding process is started before passing a third predetermined time such as 180 seconds.

If it is passed the third predetermined time before rewinding the string on the core, the cores of which supply of string is suspended are decided to be defective. That is to say, in case the amount of time passed before starting rewinding string is not long, it is possible to start winding string on the cores again. However if it takes too long to start rewinding string, liquid centers start to thaw and such centers are not strong enough to be wound by the string any more. Therefore such cores are decided to be defective.

It is preferred to set conditions to decide whether cores are to be string wound again or to be defective. Specifically the conditions shown below is preferred to be set. If the supply of the string is suspended again while rewinding the string on the core, the core having an outer diameter over the predetermined diameter (more than 35mm, for example) at this stage is started to be wound string again. The core having an outer diameter below the predetermined diameter at this stage is decided to be defective.

According to the apparatus of the present invention for manufacturing a golf ball, a construction of the clamp 10, provided for holding and rotating the core B to operate the treatment of starting

end of the string, is simplified. Moreover, because the apparatus is constructed as that the string G is wound on the core and the holding needle which is put on the core, the holding needle 13 can be pulled out from the wound string G smoothly by moving back the clamp 10 apart from the core B held by the string winding rollers 65. Therefore it is possible to move on swiftly to the next process, that is the string winding process.

Furthermore, holding down the starting end 12 of the string on the core B by the holding needle 13 can be easily carried out for sure.

That is to say, winding the starting end of the string G is ensured to be operated easily.

Additionally. a construction of the clamp 26, provided for holding and rotating the wound string core C to operate the fastening treatment of wound end of the string, is simplified. And, because the needle 30 having the hook 41 and the latch 43 is used, the treatment of the wound string end is operated in short seconds. Thus the wound string cores C can be formed effectively. Moreover, the string G is automatically cut, and the treatment of the wound string end is operated for sure.

Furthermore, the treatment means 3 of wound string end and the treatment means 2 of string starting end respectively operate the treatment of the wound string end and the treatment of the string starting end sequentially in respect of each string winding means 1, each of which is provided to be contiguous to one another, therefore

the wound string cores C are manufactured effectively. Miniaturization and simplification of the whole apparatus can be done.

According to the method of the present invention for manufacturing a golf ball, the starting end of the string is ensured to be treated easily. And because the apparatus is constructed as that the string G is wound on the core and the holding needle 13 which is put on the core, the holding needle 13 can be pulled out from the wound string G smoothly after holding the core B by the string winding rollers 65.

Therefore it is possible to move on swiftly to the next process, that is the string winding process.

Moreover, the wound end of the string is ensured to be treated easily, and because the needle 30 having the hook 41 and the latch 43 is used, movement of the machine apparatus for treatment of the wound string end is simplified.

Furthermore, the treatment means 3 of wound string end and the treatment means 2 of string starting end respectively operate the treatment of the wound string end and the treatment of the string starting end sequentially in respect of each string winding means 1, each of which is provided to be contiguous to one another, therefore the wound string cores C are manufactured effectively. And, because rewinding of the string on the wound string cores C are operated, the cores C decided to be defective products are reduced.

While preferred embodiments of the present invention have been

described in this specification, it is to be understood that the invention is illustrative and not restrictive, because various changes are possible within the spirit of the indispensable features.

Claims

CLAIMS:

1. Golf ball manufacturing apparatus for obtaining a wound string core by winding a string, made of rubber, on a core, the apparatus comprising: a treatment means for holding a wound string core in respect of which the string winding process is finished and fastening an end of the string; the treatment means including a clamp provided with a holding shaft to be rotatably driven and having a needle to be moved back and forth for fastening the string end, a rotatable pressing shaft axially addressing the holding shaft for holding the wound string core in conjunction with the holding shaft, a clamp reciprocation mechanism for moving the holding shaft and the pressing shaft to be close to and apart from each other, a needle reciprocation mechanism for moving the needle back and forth, and a path changing lever for shifting a wound end portion of the string wound on the wound string core; the needle having a hook at one end for hitching the wound end portion of the string shifted by the path changing lever, and the needle further having a latch attached on a base portion of the hook which latch may be freely moved between an open position and a closed position, the latch forming a loop with the hook when the latch is in the said closed position.

2. Golf ball manufacturing apparatus as set forth in Claim 1, wherein a string cutting means is provided for cutting the string to form the end.

3. A golf ball manufacturing method for obtaining a wound string core by winding a string, made of rubber, on a core, the method comprising the steps of : winding the string on the core to form the wound string core; holding the wound string core between a rotatably driven holding shaft and a pressing shaft which axially address each other; moving a needle to a position close to the wound string core, the needle including a hook, provided at an end of the needle, for hitching the string, and a latch which is attached on a base portion of the hook, which latch may be freely moved between an open position and a closed position so as to define a loop with the hook when closed, the needle being provided on the holding shaft and adapted to be freely moved back and forth;

rotating the holding shaft and the pressing shaft to wind the string on the wound string core and the needle so that an additional winding portion is formed ; shifting a wound end portion of the string into the hook by use of a path

changing lever, so that the end portion is hitched by the hook, and moving back the 9 t needle to push the end portion, caught by the hook, underneath the additional winding portion; cutting the string to form an end; moving the needle forward to pass above the additional winding portion, and moving the needle back to be apart from the end portion; and moving the holding shaft and the pressing shaft to be apart from each other and taking out the wound string core of which end of the string is treated to be fastened.