Patent GB-611903-A (GB)
Title: Feeding device for wood working machines
IPC: B27L5/08
Filed: 1943-03-01
Abstract: 611,903. Guillotine machines. MULLER AKT.-GES. BRUGG. March 1, 1943, No. 3327. Convention date, April 17, 1942. [Class 31(i)] [Also in Group XXIII] A wood working machine, particularly for cutting away faulty parts of a sheet of veneer, in which the work carrier moves rectilinearly towards the knife or other tool, is provided with an indicator to which the carrier is first moved and which indicates on the work, the position at which the tool will operate and with means operable upon further movement of the carrier towards the tool to stop the carrier with the work in the correct position with relation to the tool. The veneer cutting machine shown comprises a knife 11, Fig. 1a, and a carriage 4, Figs. 3, 3a, which is supported by rollers that run on horizontal slides 1, the carriage being moved to and from the knife by means of handles 18. The movement towards the blade is assisted by a counterweight 76, but a spring 86 restores the carriage to its outward position when the handles are released. The sheet 16, of material to be cut is held by gripping jaws 12, Figs. 1, 3, 3a, which are secured to bars 7 that are free to slide in guides on the upper side of the carriage 4. The bars are connected by a lever 9 which is pivoted at 8 on the carriage, so that movement of one of the bars along its guides causes the other bar to move in the opposite direction. Each of the handles 18 is secured to a bar 7 and is provided with a push member 50 which is connected to a Bowden cable 53 that operates clutches 63, 71 connecting the driving shaft 39 of the machine to a motor 83. In order to put.the machine into action both clutches must be closed so that it is necessary for the operator to hold both handles 18. This is done to ensure that the operator's hands are at a safe distance from the knife. One of the handles 18 is provided with a lever 31 that operates a clamp securing the slide 7 to its guides. The other handle 18 has a similar lever 27 which clamps the slide 7 to a bar 19 mounted to slide in guides on the frame of the machine and normally kept in its rearward position by a spring 20. The knife 11 is reciprocated axially by eccentrics on the shaft 39. The knife holder 35 also supports a press bar 43 which is forced downwards by a spring and holds the sheet material 16 against the cutting table as the knife descends. Means, for adjusting the sheet 16 is provided preferably by means of a source of light which is furnished by the light from a lamp 45 passing through a slit 46 in the knife holder 35 and showing a line of light on the sheet. The front end of the bar 19, when in its rearmost position, is spaced from a stop shoulder 82, Fig. 1a, a distance equal to that between the line of light and the knife 11. In operation, the operator, without pressing on the levers 31, 27, moves the carriage forward until the line of light registers with the line on the sheet at which it is desired to make the cut. He then presses the lever 27 to clamp the carriage to the bar 19 and continues the movement of the carriage until the bar 19 contacts the stop shoulder 82 at which position the cutting line on the sheet is beneath the knife 11. He then presses on both members 50 to engage the clutches and effect the cut. By first pressing the lever 31 to release the corresponding slide 7, one slide may be advanced relatively to the other so that cuts at an angle to the direction of movement of the carriage 4 may be effected.