Patent GB-191214154-A (GB)
Title: Automatically Acting Machine for Cutting Up Timber.
IPC: B27B29/10
Filed: 1912-06-17
Granted: 1913-02-13
Abstract: 14,154. Soc. Anon. des Anciens Etablissements Panhard et Levassor. Jan. 30, [Convention date]. Sawing-machine work feeds.-A machine for sawing timber comprises a band or other saw d. a reciprocating carriage a, a slide x to which the wood is fixed and which is movable on the carriage, and mechanism for reciprocating the carriage to feed the wood and to produce a transverse movement of the slide after each reciprocation, to bring the wood into position for another cut. The transverse movement of the slide is effected by means of a screw a<3> on the carriage operated through chain and sprocket gearing a<2>, a<1> by a wheel a<5> having pointed teeth adapted to be engaged by a spurwheel m<1> carried by a socket m<2>. The socket is slidable on guide shafts and is locked to the carriage towards the end of its longitudinal withdrawal movement by means of a tappet. On the forward movement, the socket is disengaged from the carriage by a rod m<12> carried by the tappet striking a fixed part m<15>. The spur-wheel m<1> is yieldingly mounted on a bevelwheel m<6> gearing with a bevel-wheel m<5> splined to a shaft m, which is driven through bevelgearing m<8>, m<7> and chain gearing m<9> by a shaft b. The shaft b is axially slidable in a fixed frame o, and carries a clutch portion b<3> adapted to engage with corresponding clutch portions on freely-mounted bevel-wheels b<2>, b<4>, driven in opposite directions through a bevelwheel e<2> by a pulley shaft e. The portion b<3> may be moved into engagement with a clutch portion on the bevel-wheel b<4> either (1) automatically by the engagement of a projection a<6> on the carriage a with a roller b<13> connected by a series of connecting-rods b<14> to a socket b<12> bearing against a spring carried by the rod b, or (2) by hand by means of a lever b'‹ which, when moved into the position 1, actuates, through a link b<9>, a sleeve b<8> sliding on a shaft c and engaging a spring b<7> on the shaft b. When the slide x has been moved the required distance laterally, the shaft b is moved automatically to disengage the clutch by the contact of a nut b<5>, screwing on the shaft b and embracing the shaft c, with a nut c<1> screwing on the shaft c and embracing the shaft b. The nut c<1> can be adjusted as desired by a handle c<5> operating through a shaft c<4> and bevel gearing c<3>, c<2>. When the lever b<10> is moved into the position 3, the clutch portion b<3> is moved into engagement with the clutch portion on the bevel-wheel b<2> by the sleeve b<8> acting through a spring b<6>, and the carriage is withdrawn until the nut b" strikes against the frame o, or the lever b<10> is restored to its mid-position 2. The carriage is reciprocated by a pinion f<1>, Fig. 5, driven through a train of gear-wheels from a movable friction disk f<2>, which bears against a rotating friction disk f<3>. The position of the friction disk f<2> relative to the disk f<3> is controlled so as to obtain the desired speed and direction by a rack f<5> operated by a pinion splined to a connterbalanced shaft b'. The shaft b' is axially slidable in a frame n' and can be driven from a pulley shaft e' in either direction through bevel-wheels e'2, b'2, b'4 and a clutch portion b'3. The clutch portion b'3 may be moved into engagement with the bevelwheels b'2, b'4 either (1) automatically by means of levers engaging adjustable stops on the carriage and connected by levers b<28> to a socket b<23> operating through springs b<22>, b<24>, or (2) by hand by means of a lever b<27> acting through a toothed sector and rack socket b<20>. When the clutch portion b'3 and bevel-wheel b'2 are in engagement, the wheel b'2 rotates the shaft b' until the disk f<2> is in position for giving the required speed, a nut b'5 on a screwed portion of the shaft b' then contacting with a nut c'1 threaded on rod c' adjusted by a handle c<10> and disengaging the clutch portions. When the clutch portion b'3 is engaged with the bevelwheel b'4, the disk f<2> is moved in the opposite direction across the disk f<3> until the nut b'5 ascends and meets a regulating-screw o<1>, thereby disengaging the clutch portions. If the clutch portion b'3 and bevel-wheel b'2 are again engaged, the disk f<2> is stopped at the middle of the disk f<3> by the engagement of the nut b'5 with a stop o<2> which may be withdrawn, when required, by a handle o<5>. The stop o<2> may be connected to the shaft b so that when the latter retires after each lateral movement of the slide the stop o<2> is withdrawn and the carriage starts on its forward movement. The carriage is provided with a tappet which moves a chain r<3> passing over a chain wheel r<2> geared to the shaft c a pre-arranged distance. The rotary movement of the shaft c causes a displacement of the nut c' at each forward movement of the table.