Abstract:
There is disclosed a positioning head for cutting and marking apparatus, whereby when a plurality of cutter wheels or marking-off wheels are successively moved into place, the positioning head or heads which have already been positioned in place can be locked in place. The positioning head comprises, within a housing mounted on the boss of the cutter or marking-off wheel and slidably fitted on two guide bars, a feed gear threadedly engaged with a feed screw shaft which is extended through the housing, an input gear slidably mounted on an input shaft which is extended through the housing, a group of driving gears for transmitting the rotation of the input gear to the feed gear, and a clutch for connecting and disconnecting the driving force transmitted to the feed gear from the input gear, whereby after the positioning head has been put in place, the clutch may be disengaged so as to lock the positioning head in place while any other positioning head is being moved.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to positioning heads for cutting and marking apparatus, and more particularly the invention relates to a positioning head which is designed so that after the positioning head has been put in place, the positioning head can be locked in place even any other positioning head is being moved for positioning purposes. 
     Cutting and marking apparatus are known in the art by which creases and cuts are made continuously in a long sheet material, such as, a corrugated board sheet or synthetic resin sheet in the lengthwise direction thereof and this type of known cutting and marking apparatus is so designed that each of the cutter and marking-off wheels is moved into place by a robot arm and then the cutter wheel or the marking-off wheel is locked in place by forcing a liquid such as machine oil into a hollow shaft holding the cutter or marking-off wheel so as to expand and cause the shaft to lock the wheel in place. 
     However, this type of known apparatus is disadvantageous in that unless the hollow shafts are machined to obtain the desired wall thickness with a high degree of accuracy, the hollow shaft will be expanded non-uniformly and it will thus be difficult to positively lock all the cutter wheels or the marking-off wheels in place. 
     For this reason, an apparatus has been developed in which each of the cutter wheels as well as the marking-off wheels is engaged with a key so as to fasten the cutter wheel or the marking-off wheel to a shaft, and this apparatus has disadvantages in that the apparatus is complicate in construction and high in cost. 
     Another type of apparatus is known in the art in which the bosses of all cutter or marking-off wheels are mounted threadedly on a feed screw shaft and the feed screw shaft is rotated to move the cutter wheels or the marking-off wheels into place. A disadvantage of this apparatus is that the rotation of the feed screw shaft results in the simultaneous movement of the adjacent cutter wheels and it is impossible to separately position the cutter wheels. Another disadvantage is that if it is desired to separately position the cutter wheels, it will be necessary to provide for example a feed screw shaft for each of the cutter wheels, making the apparatus complicate and large in construction. 
     SUMMARY OF THE INVENTION 
     With a view to overcoming the foregoing deficiencies in the prior art, it is an object of the invention to provide a positioning head for cutting and marking apparatus comprising a housing mounted on the boss of a cutter wheel or marking-off wheel and slidably fitted on two guide bars, and within the housing, a feed gear threadedly mounted on a feed screw shaft which is extended through the housing, an input gear slidably mounted on an input shaft which is extended through the housing, a group of driving gears for transmitting the rotation of the input gear to the feed gear, and a clutch for connecting and disconnecting the driving force transmitted from the input gear to the feed gear. 
     It is another object of the invention to provide such positioning head comprising brake means for braking the rotation of the feed gear. 
     It is still another object of the invention to provide such positioning head wherein the housing is adapted for rotation about the guide bars. 
     It is still another object of the invention to provide such positioning head wherein the driving gear group is designed so that the input gear is rotated in the same direction as the feed gear. 
     It is still another object of the invention to provide such positioning head wherein the driving gear group is so designed that the input gear and the feed gear are rotated in different directions. 
     Other and further objects, features and advantages of the present invention will appear more fully from the following description. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a front view of cutting and marking apparatus equipped with a plurality of positioning heads provided according to the teaching of the present invention. 
     FIG. 2 is a sectional view taken along the line II--II of FIG. 1. 
     FIG. 3 is a sectional view taken along the line III--III of FIG. 1. 
     FIG. 4 is a sectional view taken along the line IV--IV of FIG. 1. 
     FIG. 5 is a schematic sectional view showing an embodiment of the positioning head according to the invention. 
     FIG. 6 is a schematic sectional view showing another embodiment of the positioning head according to the invention. 
     FIG. 7 is a front view showing the manner in which the upper and lower marking-off wheels are engaged with each other. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring now to FIGS. 1, 2, 3 and 4, numeral 1 designates a frame, and 2a supporting arms mounted on guide bars 7a and 8a which are extended parallel to each other. Numeral 3a designates a desired number of positioning heads which are slidably mounted on the guide bars 7a and 8a. The guide bar 7a is rotatably mounted in the frame 1. The guide bar 8a is fixedly secured to the supporting arms 2a. Numeral 4 designates cutter wheels each of which is rotatably mounted on one of the positioning heads 3 by way of a boss 9a. Numeral 6a designates a drive shaft for the cutter wheels 4a and the drive shaft 6a is rotatably mounted in the supporting arms 2a. The positioning heads 3a are rotatable along with the supporting arms 2a about the guide bar 7a and during the suspension of operation as well as the periods of positioning operation the positioning heads 3a are each rotated in the direction of an arrow A to bring the cutter wheel 4a into its raised position. 
     Similarly, numeral 2b designates supporting arms mounted on guide bars 7b and 8b which are extended parallel to each other. Numeral 3b designates positioning heads each of which forms a pair with one of the positioning heads 3a, and a desired number of the positioning heads 3b are slidably mounted on the guide bars 7b and 8b. The guide bars 7b and 8b are extended through the supporting arms 2b and are mounted rotatably in the frame 1. Numeral 4b designates cutter wheels each of which forms a pair with one of the cutter wheels 4a, and each cutter wheel 4b is rotatably mounted on one of the positioning heads 3b by way of a boss 9b. Numeral 6b designates a drive shaft for the cutter wheels 4b, which is extended through the supporting arms 2b and is rotatably mounted in the frame 1. 
     The rotation of the positioning heads 3a which are arranged above may be effected by means of for example two hydraulic cylinders (not shown) each having its one end fastened to the supporting arm 2a near the guide bar 8a and the other end fastened to the supporting arm 2b near the guide bar 8b. 
     The marking apparatus is constructed in the like manner as the above-described cutting apparatus. 
     More specifically, numeral 2c designates supporting arms mounted on guide bars 7c and 8c which are extended parallel to each other. Numeral 3c designates a desired number of positioning heads which are slidably mounted on the guide bars 7c and 8c. The guide bar 7c is rotatably mounted in the frame 1. The guide bar 8c is fixedly secured to the supporting arms 2c. Numeral 5a designates marking-off wheels each of which is rotatably mounted on one of the positioning heads 3c by way of a boss 9c. Numeral 6c designates a drive shaft for the marking-off wheels 5a and the drive shaft 6c is rotatably mounted in the supporting arms 2c. The positioning heads 3c are rotatable along with the supporting arms 2c about the guide bar 7c, and during the suspension of operation as well as the periods of positioning operation the positioning heads 3c are each rotated in the direction of an arrow B to bring the marking-off wheel 5a into its raised position. 
     On the other hand, numeral 2d designates supporting arms which are positioned below the supporting arms 2c and the supporting arms 2d are mounted on guide bars 7d and 8d which are extended parallel to each other. Numeral 3d designates positioning heads each of which forms a pair with one of the positioning heads 3c and a desired number of the positioning heads 3d are slidably mounted on the guide bars 7d and 8d. The guide bars 7d and 8d are extended through the supporting arms 2d and are rotatably mounted in the frame 1. Numeral 5b designates marking-off wheels each of which forms a pair with one of the marking-off wheels 5a and the marking-off wheel 5b is rotatably mounted on one of the positioning heads 3d by way of a boss 9d. Numeral 6d designates a drive shaft for the marking-off wheels 5b, which is extended through the supporting arms 2d and mounted rotatably in the frame 1. 
     The rotation of the positioning heads 3c which are arranged above may be effected by means of for example two hydraulic cylinders (not shown) each having its one end fastened to the supporting arm 2c near the guide bar 8c and the other end fastened to the supporting arm 2d near the guide bar 8d. 
     Numeral 10 designates a drive motor, 11a V-belt extended over pulleys 12 and 13, and 15 a gear mounted on a shaft 14 of the pulley 13 and the gear 15 is in mesh with a gear 16a mounted on the drive shaft 6a and a gear 16c mounted on the drive shaft 6c. The gear 16a is in mesh with a gear 16b mounted on the drive shaft 6b and the gear 16c is in meash with a gear 16d mounted on the drive shaft 6d. 
     Numerals 18a and 18b designate worms mounted on a shaft 19 having a handle 20 at the upper end thereof and the lower end thereof supported by a bearing 21, and the worm 18a is in meash with a worm wheel 17a mounted on the guide bar 7a and a worm wheel 17c mounted on the guide bar 7c. The other worm 18b is in mesh with a worm wheel 17b mounted on the guide bar 7b and a worm wheel 17d mounted on the guide bar 7d. 
     The positioning heads 3a, 3b, 3c and 3d are the same in construction. Thus, the positioning head 3a mounted on the cutter wheel 4a will now be described by way of example. 
     Referring to FIG. 5, numeral 22a designates the housing of the positioning head 3a comprising a plate support 23a and a box cover 24a, and the cutter wheel 4a is rotatably mounted on the plate support 23a by way of the boss 9a. The boss 9a is slidably mounted on the drive shaft 6a formed with a key way 25a. Numeral 26a designates a key fixed to the boss 9a and the rotation of the drive shaft 6a is transmitted to the boss 9a by way of the key 26a. 
     Numeral 27a designates a feed screw shaft arranged to extend through the housing 22a, and the ends of the feed screw shaft 27a are secured to the supporting arms 2a. The feed screw shaft 27a is formed with feed threads of the same direction over the entire length thereof. Numeral 28a designates an input shaft arranged to extend through the housing 22a and the input shaft 28a is rotatably mounted in the supporting arms 2a. Numeral 45a designates a gear mounted on the input shaft 28a, and 44a a gear mounted on the guide bar 7a. The rotation of the guide bar 7a is transmitted to the input shaft 28a by way of the gears 44a and 45a. Numeral 29a designates a key way formed in the input shaft 28a. Disposed within the housing 22a are an input gear, an idler gear, a feed gear, a clutch and a brake which will be described later. 
     More specifically, numeral 32a designates an input gear slidably mounted on the input shaft 28a and the rotation of the input shaft 28a is transmitted to the input gear 32a by way of a key 30a secured to the input gear 32a. Numeral 33a designates an idler gear engaged with the input gear 32a and the idler gear 33a is rotatably mounted on a shaft 31a which is rotatably mounted in the housing 22a. Numeral 36a designates a clutch disk fixed to the idler gear so as to be concentric therewith, and 37a a clutch disk slidably mounted on the shaft 31a by way of a slide key 42a. The clutch disks 36a and 37a form a clutch 38a. Numeral 34a designates an intermediate gear fixedly mounted on the shaft 31a means of a key 43a, 39a a brake disk fixedly mounted on the shaft 31a by means of the key 43a, and 40a a brake shoe arranged to face the brake disk 39a. The brake shoe 40a and the brake disk 39a form a brake 41a. Numeral 35a designates a feed gear threadedly mounted on the feed screw shaft 27a and the feed gear 35a is in meash with the intermediate gear 34a. 
     Referring to FIG. 4, numerals 27b, 27c and 27d designate feed screw shafts, and 28b, 28c and 28d input shafts. 
     FIG. 6 shows another embodiment of the positioning head which differs from the first embodiment in that an idler gear 46a is disposed between the input gear 32a and the idler gear 33a. The idler gear 46a is rotatably mounted on a shaft 47a mounted in the housing 22a. Due to the provision of the idler gear 46a, even if the input gear 32a is rotated in the same direction as in the embodiment of FIG. 5, the feed gear 35a is rotated in the opposite direction and the positioning heads are fed in the opposite direction to that of the embodiment of FIG. 5. 
     As a result, if, for example, the left half of the positioning heads in FIG. 1 comprises the heads of the type shown in FIG. 5 and the right half of the positioning heads comprises the heads of the type shown in FIG. 6, the respective positioning heads may be conveniently brought to the sides of the cutting and marking apparatus for the purpose of repairs or the like. Numeral 50 designates a sheet of corrugated board. 
     The positioning of the positioning heads will now be described. 
     In order to put the positioning heads 3a in place, the supporting arms 2a are first rotated about the guide bar 7a in the direction of the arrow A. The rotation of the supporting arms 2a causes the positioning heads 3a to rotate in the like manner and consequently the cutter wheels 4a are raised. When the cutter wheels 4a are raised so that horizontal movement of the positioning heads 3a will not cause them to strike against the lower cutter wheels 4b, the rotary movement of the supporting arms 2a is stopped so as to maintain the thus attained condition. For this purpose, the hydraulic cylinders (not shown) are used. 
     Then, the handle 20 is moved manually so that the rotation of the worm 18a is transmitted to the worm wheel 17a and the guide bar 7a is rotated. The rotation of the guide bar 7a is transmitted to the input shaft 28a by way of the gears 44a and 45a. The rotation of the input gear 28a is transmitted to each input gear 32a by way of the key 30a and the rotation of the input gear 32a is transmitted to the idler gear 33a. 
     In this condition, the clutch disks 36a and 37a are engaged with the result that the rotation of the idler gear 33a is transmitted to the shaft 31a by way of the key 42a and the intermediate gear 34a and the brake disk 39a are rotated along with the shaft 31a, thus transmitting the rotation of the intermediate gear 34a to the feed gear 35a. When the feed gear 35a is rotated, the feed gear 35a is moved along the feed screw shaft 27a with which the former is threadedly engaged and the movement of the feed gear 35a causes the housing 22a to move along the guide bars 7a and 8a. When the movement of the housing 22a brings the cutter wheel 4a into a desired position, the clutch disks 36a and 37a are disengaged with the result that the rotation of the shaft 31a is stopped and the rotation of the input shaft 28a is no longer transmitted to the feed gear 35a, thus locking the cutter wheel 4a in the desired position. After the positioning head 3a has been locked in place, the brake is applied by pressing the brake shoe 40a against the brake disk 39a. The operation of the clutch as well as the operation of the brake can be accomplished mechanically or electrically by any known methods. 
     Then, the following positioning heads 3a are sucessively put in place in the same manner as mentioned previously. After all the positioning heads 3a have been put in place in this way, the positioning heads 3b disposed below the positioning heads 3a are all put in place in the same manner as mentioned previously. 
     After all the upper and lower positioning heads 3a and 3b have been put in place in the above-mentioned manner, the supporting arms 2a are each rotated in the direction of an arrow A&#39; back into the initial position by means of the hydraulic cylinder. The required adjustment of the engagement between the cutter wheels 4a and 4b is accomplished by fine adjustment in the same manner as the feeding of the positioning heads 3a and 3b. 
     The positioning of the marking-off wheels 5a and 5b is accomplished in the same manner as the positioning of the cutter wheels 5a and 5b. The marking-off wheels 5a and 5b are engaged as shown in FIG. 7. 
     After all the cutter wheels and the marking-off wheels have been positioned in place in the above-mentioned manner, the motor 10 is operated so that the rotation of the motor 10 is transmitted through the pulley 12 and the V-belt 11 to the pulley 13 which is mounted on the same shaft as the gear 15. The rotation of the gear 15 rotating together with the pulley 13 is transmitted to the gears 16a, 16b, 16c and 16d which are respectively mounted on the drive shafts 6a, 6b, 6c and 6d and the drive shafts 6a, 6b, 6c and 6d are simultaneously started to rotate. The rotation of the drive shafts 6a, 6b, 6c and 6d simultaneously brings the cutter wheels 4a and 4b and the marking-off wheels 5a and 5b into rotation. 
     As a result, when a long sheet of corrugated board 50 is fed in the direction of an arrow C, the marking-off wheels 5a and 5b produce continuous creases in the corrugated board sheet 50 in the lengthwise direction thereof and the sheet 50 is continuously cut in the lengthwise direction by the cutter wheels 4a and 4b. 
     It will thus be seen from the foregoing description that the positioning head according to the invention, though simple in construction, is advantageous in that once the positioning head has been put in place, the head can be firmly held in place even during the positioning operation of other positioning heads.