US1968352A - Cutting, setting, and sharpening saws - Google Patents

Description

E. POEGGEL July 31, 1934.

CUTTING, SETTING, AND SHARPENING SAWS Filed July 23, 1931 5 Sheets-Sheet 1 INVENTOR Ee/cH POEGGEL 4 gag ATTO R N EYS E. POEGGEL SETTING July 31, 1934.

, AND SHARPENING SAWS CUTTING Filed July 23, 1931 5 Sheets-Sheet 2 INVENTOR 5/2 /c// POEGGEL ATTORNEYS July. 1934. E. POEGGEL CUTTING, SETTING, AND SHARPENING SAWS Filed July 23, 1951 5 Sheets-Sheet 3 8 V fin v\ 000 rig a A I Qun Mn 6% ll v'ENToR 52, C P056615 L ATTORNEYS E. POEGGEL July 31, 1934.

CUTTING, SETTING, SHARPENING SAWS Filed July 23, 931 5 Sheets-Sheet 4 INVENTOR' E2 /0// POEGGEL ATTORNEYS July 31, 1934. E. POEGGEL CUTTING, SETTING, AND SHARPENING SAWS Filed July 23, 1931 5 Sheets-Sheet 5 lNVENTOR POE'GGEL BY A I ATTORNEYS EE/Cl/ Patented July 3 1, 1934 UNITED STATES CUTTING, SETTING, AND SHARPENING SAWS Erich Poeggel, Remschcld, Germany Application July 23, 1931, Serial No. 552,702

In Germany March 10, 1931 8 Claims.

The present invention relates to a process and apparatus for the setting and sharpening and/or the cutting (toothing) setting and sharpening of saws of all kinds, in which the setting and sharpening and/or cutting, setting and sharpening are effected simultaneously and automatically on one machine, and also the initiation of the individual operations and their interruption are carried out entirely automatically by the machine itself. Thus in the manufacture of the saws no manual labour of any kind is done, either for the feeding in of the blades or bands from which the saws are being made or during cutting, setting and sharpening, but the machine is simply set in advance for the required spacing and shape of tooth, and in the case of circular saws the blades are placed on. Thus the heading in the new process is performed quite automatically by the machine. The forward feed of the blades and the actuation of the individual parts of the machine are effected from one shaft, and in full interdependence on one another, by the apparatus at the same time making way for the feed and during the operations of manufacture, which alltake place simultaneously, causing no forward feed to be made. A typical way in which this can be done is shown in the example illustrated.

It has hitherto been usual to carry out the processes of toothing and setting separately on different machines. In this case the teeth are formed by being individually stamped out, and the spacing and beginning of toothing are effected by hand. This leads to the number of teeth in similar saws being different, and the number itself is frequently an odd one, which brings about irregularities in the subsequent setting process, since setting always takes place by two neighbouring teeth being simultaneously set. In the new apparatus, however, two teeth are always produced simultaneously, so that the number is always divisible by two, and further, due to the mechanical heading, the number of teeth is always the same for the same class and size of saw. p

Setting has hitherto been carriedout by a hammer simultaneously setting two teeth, the setting of the two neighbouring teeth being done, however, in opposite directions. Hereby the one r tooth is set in the direction of the hammer action,

but the other tooth in the direction opposed to the hammer action, i. e. by depression of the saw blade. The consequence is that the setting on the one side is more pronounced than the setting on N the other, whereas in the new apparatus the setting of the two neighbouring teeth, while still Sharpening of saws is still generally carried out W by hand by means of files, in which, for example in the case of frame saw toothing, the slope resulting from filing, with reference to the setting of the individual teeth, is directed now outwards, now inwards, whereas having regard to the uniformity of cutting of the saw and also its actual sharpness the slope resulting from sharpening should always be on the outer edge of the tooth. With correct adjustment this will always take place with the new machine, as sharpening is always done towards the set side. The machining of the individual teeth thus always takes place in the new process in the direction of set of the tooth being worked on, to which point little or no regard has hitherto been paid.

That in addition to the advantages indicated above and those associated therewith there is a considerable saving of labour and time as compared with existing methods and machines due to the elimination of transport from one working point to another and to the mechanization of the work, is a point which surely needs no elaboration. The saws produced by the new process and equipment must therefore be considerably cheap er in manufacture than those produced by the methods hitherto in use.

The drawings give a representation of the new process and of two equipments, as follows:

Fig. 1 is a side view of a cutting, setting and sharpening machine for longitudinal saws;

Fig. 2 shows a toothcutting device and is a section along the line 2-2 of Figure 1;

Fig. 3 is a section along the line 33 of Figure 2;

Fig. 4 shows a setting device and is a section along the line -1-4 of Figure 1;

Fig. 5 is a section along the line 5-5 of Figure 4;

Fig. 6 shows a sharpening apparatus and is a section along the line 6-6 of Figure 1;

Fig. '7 is a vertical section along the-line 7-7 of Figure 6;

Fig. 8 is a section along the line 8- 8 of Fig. 2.

The main shaft 1 of the machine is shown in Figures 1, 2 and 6 of the drawings. This shaft 105 is used for the driving of all parts of the machine and is driven by a source of power not shown in the drawings. The shaft 1 carries a crank 2 provided with a crank pin 4 which may be adjusted by means of a spindle 3 (Fig. 2). The pin 4 passes through one end of a connecting rod 5 (Fig. 1) which is pivoted to a rocking lever 6, so that a rotation of the crank pin 4 causes an oscillation of the lever 6. A toothed wheel 8 is situated close to the lever 6 which carries a pawl '7. The pawl 7 engages one of the teeth of the wheel 8 while the lever 6 is moved from left to right (looking in the direction of Figure 1), so that the wheel 8 is moved along with the lever 6. While the pawl '7 is moved in the opposite direction it passes over the teeth of the wheel 8 so that the latter is rotated in one direction only.

The wheel 8 is firmly connected with a feed roller 9 so that the rotation of the wheel 8 is transmitted to said roller. Another loose roller 10 is situated over the roller 9. The rollers 9 and 10 are used to move intermittently a band 11 which is fed between said rollers and out of which the saw blades are made. The feed table which supports the band while it passes through the machine, is not shown in the drawings.

A bevel wheel 12 keyed to the shaft 1 and shown in Figure 2 drives another bevel wheel 13 (Fig. 1) which is firmly connected with a shaft 14. Another bevel wheel 15 (Fig. 2) which is carried by the shaft 1, drives a bevel wheel 16 (Figs. 1 and 2) keyed to the shaft 17. The rotation of the shaft 17 is transmitted to the bevel wheel 18 meshing with a bevel wheel 19 which is carried by the shaft 20 (Fig. l). The shaft 20 is thus rotated by the bevel wheel 18 at a speed which is preferably one-third of the speed of the shaft 1.

A ratchet disc 53 provided with notches 52 and shown in Figure 2 is rotatably mounted on a sleeve 5'7 carried by the shaft 20. The ratio of the speed of the shaft 1 to the speed of the shaft 20 should correspond to the number of notches 52 for reasons which will be apparent hereinafter. In the example illustrated, the ratio of the speed of the shaft 1 to the speed of the shaft 20 is equal to three and there are three notches 52 on the disc 53. The ratio of these speeds must be changed if discs having a different number of notches are used.

The machine shown in Figure 1 comprises a device 21 for cutting teeth, a setting device 23 and a sharpening device 24. The teeth-cutting device 21 is carried by the supports 22 and is firmly connected therewith. The device 21 is placed close to the feed rollers 9 and 10 in order to facilitate the movement of the band 11 through the machine. The setting and sharpening devices 23 and 24 are supported by a slide bed 25 (Figs. 4 and 6) and may be moved along said slide bed 25 with respect to the device 21. The lower parts of the casings enclosing the- devices 23 and 24 are provided with flanges which surround U- shaped members forming a part of the slide bed 25.

The devices 23 and 24 must be moved with respect to the device 21 each time when the machine hasto produce saw teeth of a different shape. The distances between the devices 21, 23 and 24 depend therefore, on the length of the teeth which are to be produced or (which means the same thing) on the speed imparted to the band 11 by the feed rollers 9 and 10.

The teeth cutting device 21 is shown in section in Figures 2 and 8. The device 21 comprises a toothed wheel 28 which is loosely mounted on the shaft 20 but may be operatively connected with said shaft, as will appear hereinafter. The wheel 28 drives a toothed wheel 29 situated above the wheel'28. The wheel 29 is firmly connected with-a bevel wheel 30 which meshes with a bevel wheel 31 carried by the shaft 32. The rotation of the shaft 32 is transmitted to a cam disc 33 shown in Figures 2 and 3. As shown in Figure '3, an eccentric 34 surrounds the cam 33 and is connected with a punch 35, so that the rotation of the shaft 32 is transformed into an up-anddown movement of the punch 35. The punch 35 is provided with a cutter 36 and a holder 37. The two last-mentioned parts are detachably connected with the punch 35 so that they can be easily replaced. Springs 38 are placed between the punch body 35 and the holders 37 so that when the punch is moved downward, the holders 37 can come in contact with the band 11 and can hold it while the cutter 36 is pressed into the band 11 and the saw teeth are being cut. A sliding shoe 39 connected with the casing of the device 21 is used as a guide for the punch 35 during the reciprocatory movement of the latter.

A support 40 is situated under the punch 35 and is provided with a detachable counter cutter or die 41.

The, punch 35 is adapted to make two sawteeth during one revolution of the shaft 32. The gear transmission is preferably such that the shaft 32 rotates three times as fast as the shaft 20, or as quickly as the shaft 1.

The teeth-cutting device 21 is provided with an automatic locking device which prevents a further formation of teeth but does not prevent the band 11 from continuing to move through the machine. This locking device is operable while the straight edge portions or the heads of saws pass through the cutting device and it comprises a toothed wheel 42 carried by the shaft 20, but situated outside the casing of the teeth-cutting device 21, (Fig. 8). The wheel 42 drives a wheel 43a firmly connected with the wheel 431) (Fig. 2). The wheel 43b drives a wheel 43c firmly connected with the wheel 43d. The latter drives a wheel 43c firmly connected with the wheel 43 The wheel 43; drives a wheel 439 which drives the wheel 43h. The wheel 43h meshes with a toothed wheel 44. The wheels 43:: to 43h are preferably of such dimensions that during onethird of a complete revolution of the shaft 20, or one complete revolution of the shaft 32, the wheel 43h turns a distance corresponding to the pitch of its teeth. The number of teeth of the toothed wheel 44 is preferably equal to one-half the number of the teeth of a saw blade. Then the wheel 44 will complete one revolution when one saw blade'has passed through the device 21, since the punch 35 makes two teeth during one revolution of the shaft 32.

A cam disc 45 provided with a cam surface 4'1 and a gap 46 is firmly connected with the wheel 44 and is rotated thereby. The length of the circumference of the cam surface'47 corresponds to the total length of the teeth of a saw blade, while the length of the gap 46 corresponds to the length of the two heads of.a saw blade.

A roller 48 is carried by a rod 49 connected with a pawl 50. A coil spring 51 surrounds the rod 49 and presses the pawl against the wheel 53, and also presses simultaneously the roller 48 against the cam disc 45. Whefrthe' device begins its operations, the cam disc 45 is preferably placed in such a way that the middle of the gap 46 is situated under the roller 48; at the same time one of the notches 52 is situated opposite the shape of an abutment which is adapted to come in contact with a correspondingly shaped end 56 of a lever carrying a clutch 54 and pivoted at the opposite end to the casing. Consequently, when the pawl 50 is situated in one of the notches 52, it presses the lever 55 downward (looking in the direction of Figure 8) against the action of the spring 58 and keeps the clutch 54 open, thus interrupting a connection between the wheel 53 and the shaft 20.

The wheel 53 is keyed to the sleeve 5'7 mounted on the shaft 20 and. slidable on said shaft. The wheel 28is also keyed to the sleeve 5'7 so that it can rotate only together with the wheel 53. Therefore, when the pawl 50 locks the wheel 53, the toothed wheel 28 is also prevented from moving.

Due to this arrangement, while the wheel 53 is locked by the pawl 50, the shaft 20 continues to rotate, this rotation being transmitted to the wheel 42 keyed to said shaft and consequently to the cam disc 45 through the gearing 43a to 44; on the other hand, the shaft 32 which is driven by the wheel 28 through the gearing 29 to 31 is prevented from rotating because the wheel 28 is locked together with the wheel 53. Consequently, the band or the saw 11 will be moved through the machine without coming in contact with the punch 35, and the cam disc 45 will be rotated until the cam surface 47 comes in contact with the roller 48. Then the cam surface 47 will move the roller 48 and consequently the frame 49 carrying said roller, to the right (looking in the direction of Figure 2) and will pull the pawl '50 out of the notch 52 against the action of the spring 51. At the same time the lever 55 will be able to move upwards (looking in the direction of Figure 8) due to the action of the spring 58, and the clutch 54 carried by the lever 55 will connect the shaft 20 with thewheels 53 and 28. The toothed wheel 28'will be rotated by the shaft 20, will operate the punch 35 and will rotate the wheel 53 until the cam surface 47 leaves the roller 48 which again comes in contact with the gap 46 of the cam disc 45. At the same time the next notch 52 will come in front of the pawl 50. The spring 51 will press the pawl .50 into this notch, so that the wheels 53 and 28 will be locked again and the coupling 54 (Fig. 8) will be released again.

The locking device interrupts, therefore, the operative connection between the punch 35 and the shaft 20 while the heads of a saw pass under the punch 35. Obviously, the movements of the punch 35 and of the feed rollers 9 and 10 must be timed in such a waythat the punch 35 does not Figure 4 comprises a toothed wheel 59 carried by the shaft 20 and meshing with a toothed wheel 60.. The wheel 59 is similar to the wheel 28 of the cutting device 21 (Fig. 2) and is operated in a similar manner. The wheel 60 is'fii'mly connected with a bevel wheel 61 which drives a bevel ure 5, this projection does not fill in the entire recess; if the shaft 63 is rotated in the direction shown in Figure 5 the projection will press against one of the end walls of the recess and a clearance 66 will be formed between the opposite end wall of the recess and the projection.

The cam disc 64 is in contact with a roller 67 carried by a punch holder 68. A setting punch 70 is connected with one end of the holder 68 while its other end is in contact with a spring 69. The spring 69 keeps the roller 67 pressed against the cam disc 64 so that the punch holder 68 follows the cam surface 65. When the roller 6'7 comes in contact with the sharp incline of the cam surface, the punch holder 68 is thrust downward through the action of the spring 69. At the same time the roller 67 will press against the cam disc 64 and due to the provision of the clearance 66, the cam disc 64 will yield to this pressure and will move somewhat with respect to the shaft 63. Due to this arrangement the punch holder 68 will move with full force downward and this force will not be diminished by the counter pressure of the cam disc 64.

A nut 74 is situated above the spring 69 and may be used for adjusting the tension of said spring.

Due to the shape of the cam disc 64 and the shaft 63 the punch '70 strikes hard hammer-like blows against the band or the saw 11. A die or anvil '71 is situated under the punch '70 and is carried by a stand '72 supported by the housing 73. The operative surfaces of the punch 70 and the die '71 must correspond to the desired position and form of the saw teeth.

A second punch holder 68a is similar to the one just described and is used for setting simultaneously the second one of a pair of teeth; the punch holder 68a is driven by means of a cam disc 64a and a shaft 63a rotated by the wheel 60a meshing with a wheel 60!) which is driven by the .wheel 59 (Fig. 4).

A plunger pin '75 is used to lock the setting device during the passing of the heads of the saw blade. with a spring '76 pressing against a sliding head '77 which carries one end of the pin '75 and also carries a roller 79 adapted to slide over the side surface of a cam disc '78 rotated 'by a shaft 83.

The shaft 83 is driven by the shaft 14 by means of a bevel wheel 81 keyed to the shaft 14 and meshing with a bevel wheel 82 which is firmly connected with the shaft 83. The transmission ratio is preferably one to one. Due to this arrangement the spring can push the head '77 together with the pin '75 to the right (looking in the direction of Figure 4) when the roller '79 comes in contact with the cut-out part of the cam 78. In this case the tapered end of the pin '75 will project into the space between two teeth of the saw which passes through the setting device 23, while the head 7'7 will pull the pawl to the'right (looking in the direction of Figure 4) and will prevent it from penetrating into one of the notches 52a of the wheel 53a carried by the shaft 20.

If, however, the tapered end of the pin '75 does not meet the teeth of a saw, but instead of that comes in contact with the head portion of the saw, the sliding head 7'7. is prevented from moving too much to the right, so that it will allow the pawl 80 to penetrate into one of the notches 52a as soon as said notch comes in front of the For that purpose the device is provided.

III

speed by the shaft 14 which carries the bevel pawl. Then the wheel 53a is locked, so that the wheel 59 connected witlnthe Wheel 5311. is also looked. At the same time the pawl 80, while moving into one of the notches 52a releases a clutch which is not shown in the drawings and which connects operatively the shaft with the wheel 59 (said clutch being similar to the clutch 54 shown in Figure 8) thus holding the wheel 59 while the shaft 20 continues to rotate. The setting device is released after the head portions of the saw have passed beyond the pin '75, and when a gap between two saw-teeth is again situated in front of said pin. Then the-spring '76 will be able to push the head 7'7 further to the right (Fig. 4) and thehead '77 will in its turn move the tapered end of the pin '75 into this gap. The head '77, due to its forward motion, will pull the pawl 80 out of the notch 52a and at the same time the pawl 80 will move out of contact with the clutch which will connect operatively the wheels 5311 and 59 with the rotating shaft 20, so that these wheels will begin to rotate, driving the shafts 63 and 63a and the setting punches '70 and a.

As shown in Figure 1, the wheel 8 and the roller 9 impart an intermittent feeding motion to the saw or band 11. The saw is moved forward while the pawl 7 pushes the teeth of the wheel 8 and remain stationary while the pawl '7 slides backwards over these teeth. The pin '75 shown in Figure 4 is also moved intermittently by means of the cam '78. This cam is rotated at a constant wheel 81 meshing with the bevel wheel 82 carried by the cam shaft 83. The cam '78 is shaped in such a way that it presses the roller '79 and the head '77 from right to left (looking in the direction of Figure 4) while the' saw 11 is moved through the machine, thus maintaining the pin '75 out of contact with the teeth of the saw 11.

, The surface of the cam '78 which is in contact with the roller '79 allows the spring '76 to move the head '77 in the opposite direction as soon as the feeding movement of the saw 11 is interrupted, so that the pin '75 is pressed into the space between two adjacent teeth of the saw 11.

I the feed motion of the saw is resumed.

Obviously, the reciprocating motion of the pin '75 caused by the cam '78 is necessary to permit the intermittent feeding movement of the saw 11, since the pin '75 must be withdrawn from the space between two adjacent teeth before the saw can be moved. During the greater part of this rec'procatory motion of the pin '75 the pawl is situated in one of the notches 52a, thus locking the punch holders 68 and 68a. The pawl 80 is pulled out of the notch 52a and the punch holders 68 and 68a are permitted to operate only 1 when the pin '75 is in or near its extreme righthand position projecting between two teeth of the saw 11, since in that position the saw 11 is at rest and no straight edge portions are situated under the punch holder 68.

The sharpening device 24 is shown in section in Figu es 6 and '7. Means for locking this device are similar to those used for locking the setting device 23 and comprise a wheel 537) provided with notches 52b and adapted to be locked by a pawl 50a, 80a cooperating with a sliding head 77a and a sliding pin 75a. The head 77a is actuated by means of a spring 76a and a cam disc 78a rotated by a shaft 83a and bevel wheels 82a and 81a and sliding over a roller 79a carried by the head '7'7a.

The shaft 20 rotates a toothed wheel 84 which engages a toothed wheel 85 and a toothed wheel 86. The wheel 85 is keyed to a crank shaft 8'7 .which drives a connecting rod 89 by means of a crank'88. The wheel 86 meshes with a wheel 85a keyed to a crank shaft 87a and drivingJa connecting rod 89a by means of a crank 88a. The connecting rods 89 and 89a are guided in slides 91 and 91a, respectively. A grinding disc mounted on a flexible shaft 92 carried by the rod 89 cooperates with a similar disc 90a mounted on a flexible shaft 92a carried by the rod 89a. The reciprocating movement of the discs 90 and 90a is used for the sharpening of the teeth of a saw or band 11. The flexible shafts 92 and 92a are rotated at a constant speed by a driving mechanism which is not shown in the drawings.

Means for locking the sharpening device 24 (Fig. '7) which are substantially similar to means for locking the cutting and setting devices, coma clutch 54a and pivoted to the casing When a the pawl 50a is situated in one of the notches 52b, it presses the lever 55a downward against the action of the spring 58a, thus interrupting a connection between the wheel 53b and the shaft 20. The wheel 53b is keyed to the sleeve 57a slidably mounted on the shaft 20. The wheel 84 is also keyed to the sleeve 57a.

The device shown in Figures 6 and 7 is used for the sharpening of so-called bow teeth. Slight changes in the construction of the device may be necessary to enable it to sharpen so-called M-teeth or frame saw teeth. i

Having now particularly described and ascertained the nature of my said invention, and in what manner the same is to be performed, I declare that what I claim is:-

1. In combination, means for treating the teeth of a saw, a shaft, a gear mechanism driven by said shaft and driving said means, a feeding mechanism for supplying a saw to said means, a driving mechanism connected with said shaft and with said feeding mechanism, and means locking said gear mechanism for predetermined periods of time.

2. In combination, means for treating the teeth of a saw, a shaft, means driven by said shaft and driving the first-mentioned means, a rotary member operatively connected with the second-mentioned means and adapted to be rotated by said shaft, a feeding mechanism for supplying a saw to the first-mentioned means, a driving mecha-. nism connected with said shaftand with said feeding mechanism, means locking the secondmentioned means and comprising a member adapted to stop the rotation of the first-mentioned member; and another member connected with the last-mentioned means and adapted to project into the space between two teeth of the saw while the teeth of the saw are being treated, the first-mentioned member being maintained in the locked position during the passage of the straight edge portions of the saw.

3. In combination, means for treating the teeth of a saw, means for moving the saw to the firstmentioned means, a driving mechanism, means operatively connecting said driving mechanism with the first-mentioned means, means operatively connecting said driving mechanism with the second-mentioned means, and means interrupting the operation of the first-mentioned means during the passage of the straight edgeportions of the saw.

4. In combination, means for treating the teeth of a saw, a shaft, a driving mechanism connected with said shaft, means connected with said driving mechanism for intermittently moving a saw to the first-mentioned means, a pin, a movable head carrying said pin, a spring adapted to actuate said head to press said pin againstsaid saw, means connected with said driving mechanism for moving said head to remove said pin out of contact with the teeth of the saw, means operatively connecting said shaft with the first-mentioned means, and means for locking the fourthmentioned means to interrupt the operative connection between said shaft and the first-mentioned means, the last-mentioned locking means being moved by said head to an inoperative position while said pin is in contact with a pair of the teeth of the saw. v 5. In combination, means for treating the teeth of a saw, a shaft, a driving mechanism connected with said shaft, means connected with said driving mechanism for intermittently moving a saw to the first-mentioned means, a toothed wheel carried by said shaft, means operatively connecting said toothed wheel with the firstmentioned means, another wheel provided with a plurality of notches and rotatable along with said toothed wheel, means operatively connecting the second-mentioned wheel with said shaft, a pawl adapted to be inserted into one of said notches to lock the second-mentioned wheel, a spring pressing said pawl against the secondmentioned wheel, and means connected with said driving mechanism to withdraw said pawl from the notch against the action of said spring.

6. In combination, a driving shaft, a toothed wheel, means connected with said driving shaft and said toothed wheel for intermittently rotating said toothed wheel, a roller connected and rotatable along with said toothed wheel, another roller cooperating with the first-mentioned roller for intermittently moving a saw, another shaft, means operatively connecting said driving shaft with the second-mentioned shaft, a cutting device, means operatively connecting said cutting device with the second-mentioned shaft, means driven by the second-mentioned shaft for interrupting the operative connection between the second-mentioned shaft and said cutting device, a s tting device, means operatively connecting said setting device with the second-mentioned shaft, means driven by the first-mentioned shaft for interrupting the operative connection between said setting device and the second-mentioned shaft, a member connected with the last-mentioned means and adapted to project into the space between two teeth of the saw while the operative connection between said setting device and the second-mentioned shaft is being maintained, a sharpening device, means operatively connecting said sharpening device with the second-mentioned shaft, means driven by the firstmentioned shaft for interrupting-the operative connection between said sharpening device and the second-mentioned shaft, and another member connected with the last-mentioned-means and adapted to project into the space between two teeth of the saw while the operative connection between said sharpening device and the second-mentioned shaft is being maintained.

7. In combination, a driving shaft, a toothed wheel, a pawl adapted to mesh with the teeth of said wheel, a crank mechanism, connected with said pawl and said driving shaft for intermittently rotating said wheel, a cutting device, a setting device, a sharpening device, means driven by said wheel for intermittently moving a saw to said cutting, setting and sharpening devices, another shaft, means operatively connecting the first-mentioned shaft with the second-mentioned shaft, separate means operatively connecting the second-mentioned shaft with said cutting, setting and sharpening devices, and separate means interrupting at predetermined intervals the operative tween the second-mentioned shaft and said cutting, setting and sharpening devices.

connection be- 1 8. In combination, a driving shaft, -a toothed wheel, a pawl adapted to mesh with the teeth of said wheel, a crank mechanism connected with said pawl and said driving shaftfor intermittently rotating said wheel, a cutting device, a setting device, a sharpening device, means driven by said wheel for intermittently moving a saw through said cutting, setting, and sharpening devices, another shaft, means operatively connecting the first-mentioned shaft with the second-mentioned shaft, separate means opera- Ill tively connecting the second-mentioned shaft I with said cutting, setting and sharpening devices, means driven by the second-mentioned shaft for locking said cutting device-while straight edge portions of a saw pass through said cutting device, means driven by the first-mentioned shaft for locking said setting device, means connected with the last-mentioned means for'maintaining said setting device in the locked position while

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