SU1759625A1 - Milling machine guard - Google Patents

Abstract

Usage: in the woodworking industry on milling machines with lower spindle arrangement for manual submission of blanks. The fence consists of a horizontal guide axis 1. located parallel to the rulers 3, fixed to the casing 4. The casing 4 is mounted on the table 2 of the machine. The loops 8 are mounted on the horizontal guide axis 1 with the ability to move along the axis 1 a protective shield 9, which is located parallel to the guide bars 3. The shield 9 is equipped with handles 10 and a transparent window 11. In the lower part of the shield 9, a counter-deflector is attached to the loop 12 plate 13. 4 Il.

Description

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The invention relates to the woodworking industry and can be used on milling machines with a lower spindle arrangement for manual feeding of blanks.

Known guards for milling machines with lower spindle location are described in the article Horsefield KS. and others. Safety and occupational hygiene in the industry Safety Practitioner - 1988 - volume 6-No.2-с9-12, the fence of Figure 5 consists of a frame of the fence, guide lines and two clamps - horizontal and vertical, fixed on the rotary brackets mounted on a vertical rod. The disadvantages of this fence are reduced productivity due to the need to push the workpiece after hand feed with the pusher, the complexity of the design due to the presence of two clamps, and the impossibility of using

fence elements to feed the workpiece & treatment area.

The tunnel guard of the TMPA, (see Safety Regulations for Operators of Milling Machines with Bottom Spindle Arrangements. Min.Truda, Nova Zelandi, Wellington - 1983, figure 10) consists of a guard enclosure, guides rulers and a clamp with a bracket installed with the possibility of height adjustment on a vertical rod. The disadvantages of this fence are a decrease in productivity due to the need, after hand feeding, to additionally supply the workpiece with the pusher at the end of its processing, as well as the inability of the fence elements to perform the function of feeding the workpiece to the treatment area.

Known fence milling machine according to French patent No. 2513t71, cl. At 27 G 21/00. B 27 C 5/00, 7/00, B 27 F 5/00,

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including a guard enclosure mounted on a table, guide bars, a protective screen mounted on a vertical rod, a clamp and a pusher. The disadvantages of this fence are the complexity of the design, due to the presence of the clamp, protective screen and the pusher, reduced performance due to the need to use the pusher in the processing of the workpiece, as well as the inability of the elements of the fence to feed the workpiece during its processing.

It is also known a device for processing workpieces on milling machines with a lower spindle arrangement, (see British Standard 6854. Safety systems for machine tools, part 1. General recommendations - 1987 - fig. Consisting of the enclosure, guiding lines, clamp (tsulagi), equipped with clips to secure the workpiece and handles for feeding to the tool. The disadvantages of this device are reduced productivity due to the need for securing the workpiece with the clamps at the beginning of processing and release after processing, low security, due to the possibility of injuries to the hands of broken pieces of the damaged workpiece, and the inability to perform the function of fencing the tool area during workpiece replacement and in the intervals between milling blanks.

The tool protection is also known (see the RE on a single-spindle milling machine with a tenon carriage model FSH-1A; Dnepropetrovsk, 1988 FSSh-1AOO, 000-OREE, pp. 20-22, fig.64, 6.5. P. .6.4.4, 6.4.5) a prototype, which consists of a tool guard body, guide bars, a rotary shield with a claw protection against a backward ejection attached to it, with the shield hinged on a horizontal retractable axis fixed to the guide bracket ruler on which there is a device for adjusting the angle of rotation of the shield and the spring d balancing the weight of the shield. The disadvantages of this protection are low safety due to the fact that during the processing of the workpiece blank the worker’s hand is below the shield resting on the top of the blank and can get into the tool area as a result of accidental disruption of the hand from the surface of the fed blank. also, the difficulty in operation is explained by the fact that the gap between the upper surface of the workpiece and the extreme upper position of the bottom of the shield

should not be greater than 1 ... 2 mm to ensure the operation of the claw anti-backing protection, which requires readjustment of protection with each slight change in the height of the workpiece. In addition, the inadequacies of this fence include the inability to use the elements of the fence to produce a safe workpiece for the hands of the worker.

0 during its milling.

The aim of the invention is to extend the functionality of the fencing. day by using fencing elements to effect the supply of cooking for milling.

This goal is achieved by the fact that the protective shield of the fence is equipped with handles for its movement, the horizontal guide axis is set parallel to the guide bars with the possibility of parallel movement, and the anti-plumping element is fixed on the lower edge of the shield so that it can be rotated in a plane,

5 perpendicular to the plane of the shield.

Compared with the prototype, fencing has the following advantages:

-improving the productivity of processing blanks;

0 - increase safety;

-improving working conditions;

-convenience in operation;

- reduction of commissioning.

Figure 1 shows the fence, general view, the beginning of the submission of the workpiece; figure 2 is the same, side view; fig.Z - the same, the end of the filing of the workpiece; Fig. 4 shows the position of the fence in the intervals between the processing of workpieces, a transverse section along the axis

0 tool.

The fence consists of a horizontal guide axis 1 located above the table 2 surface of a milling machine with a lower spindle arrangement, parallel to the rulers 3 fixed to the casing of the fence 4 mounted above the working tool (cutter) 5 and fixed to the table 2. Horizontal guide axis 1 equipped with devices for changing its position relative to the surface of table 2 and rulers 3, made, for example, in the form of lifting screws 6, mounted on brackets 7 to table 2. Lower ends of screws 6 are screwed into the threads 5 openings at the ends of the axis 1. On the horizontal guide axis 1 fixed by loops 8, providing free rotation around axis 1, a protective shield 9 located parallel to the rulers 3 and moving longitudinally reciprocating in the direction specified by sliding the loops 8 along axis 1 The flap is provided with handles 10 for moving it manually and with a window 11 closed, for example glass, for visual observation of the processing of the workpiece. In the lower part of the protective shield 9, a anti-ejection plate 13 is fixed on the loop 12, which simultaneously supports the end face of the workpiece 14. A stop 15 is fixed on the rulers 3, restricting the rotation of the protective shield 9 in the direction of the milling cutter 5 and preventing contact of the parts of the shield 9 and the cutter blades 5. The length of the protective flap 9 is made such that, at the front and rear extreme position of the flap 9, the gap between the rulers 3 into which the milling cutter 5 passes is blocked by the flap body 9. The extreme positions of the flap 9 are determined by stopping the loops 8 into the brackets 7.

The job of the fence is as follows.

The worker at the handles 10 rotates the flap 9 around the axis 1 upward until the position of the lower edge of the flap 9 above the table allows the workpiece 14 to be pushed under it all the way into the ruler 3. After that, the flap 9 rotates by the handles 10 downwards against the stop into the upper plane of the workpiece 14. In this case, the loops 8 abut against the body of the axis 1. If this does not happen, the axis 1 is lowered by screws 6 to the position that meets this requirement. After that, the worker, pressing on the handles 10, perpendicular to the plane of the rulers 3, moves the flap 9 forward from the rightmost position to the leftmost position. During the movement of the flap 9, the stop 13 presses against the end of the workpiece 14 and forces it to move together with the flap 9. Due to the pressure on the flap 9 in the direction perpendicular to the movement, the lower edge of the flap 9 presses the workpiece 14 to the rulers 3 during its milling. Visual observation of the milling process is carried out along the path of movement through the window 11. In the extreme left position, behind the handles 10, the shield is raised above the workpiece 14D, after which it is removed. Flap 9 goes down

to the surface of table 2 and in contact with the anvil 15 and back to its original position. In this case, the anti-thrower plate 13 is rotated by

loop 12 and does not interfere with the shield 9 to fully lower and close the dangerous zone of the tool 5. Then the cycle repeats.

The presence of an anti-throwing element 13 eliminates the possibility of release

blanks 14 from under the shield 9. The location of the arms 10 above the surface of the workpiece and the presence of the stop 15 exclude injuries to the worker’s hands when the blank is suddenly destroyed. The ability to rotate the flap 9 around axis 1 allows the delivery of workpieces of different cross-section without re-adjusting the fence. The possibility of changing the vertical position of the fence 9 relative to

Axis 1 allows you to completely close the danger zone of the tool 5 after processing the workpiece 14 and in the intervals between milling. The fence allows you to completely eliminate the contact of the hands of the worker with

billet 14 during milling. The fence allows, without changeover, to feed blanks of various lengths and widths. The fence provides free access to the tool.

Claims (2)

1. Fencing a milling machine with a lower spindle arrangement, containing a casing mounted on the machine table, guides and swivel rulers on a horizontal axle, a protective flap with a rotation stop and anti-throwing element, depending on the fact that. in order to extend the functionality, protective the shield is equipped with handles for its movement, the horizontal guide axis is installed parallel to the guide bars with the possibility of parallel movement, and the anti-thrower the element is fixed on the lower edge of the shield with the possibility of rotation in a plane perpendicular to the plane of the shield. 2. Fencing in accordance with claim 1, from luchayuschee- so that, in order to improve the conditions of labor, the shield is provided with a window made of transparent material. / 4 15 7- J I m j Fig.i S  V Tl 1 GP ten to az Fig