WO2015101697A1

WO2015101697A1 - Automatic pneumatic vice

Info

Publication number: WO2015101697A1
Application number: PCT/FI2014/000030
Authority: WO
Inventors: Nils Herman HENRIKSSON
Original assignee: Henriksson Nils Herman
Priority date: 2014-01-03
Filing date: 2014-10-28
Publication date: 2015-07-09
Also published as: FI20140002L

Abstract

A pneumatic vice for automatic metalworking without hydraulic force amplifier comprising; a body box (1) where two screw spindles (17, 18a) are parallel mounted by bearings, a clamping lever (30a) mounted on the screw spindles by two nut (29, 32) with bearing journal, a drive motor (13) and two timing pulleys (65, 70) to move clamping lever (30a) which main fork-end with an swivel able upright (36, 37, 38) carry the movable jaw (15), a pneumatic cylinder (14) with two-part piston (78) mounted by a rotary push flange (79) on the end of screw spindle (18), four support roller (60) against the fastening plane (3) to resist bending moment from clamping force, two horizontal joint screws (42) which correct position of gripping list (44) and a fixed jaw (16). The drive motor move work piece against the fixed jaw and the pneumatic cylinder make the clamping force by moving the screw spindle (18a). An external pneumatic clamp move the work piece in Y-direction against studs (4 or 5) which have 35 alternatives places on the body deck (2).

Description

AUTOMATIC PNEUMATIC VICE

BACKGROUND OF THE INVENTION

This invention relates to an improved metalworking vice with automatic positioning in x-y-direction of work pieces, operated by compressed air cylinders. An automatic vice will work together with a machining centre where a manipulator or a robot move the work piece to-from the vice, and turn the work piece between the machining stages. An automatic pneumatic vice according to this invention is provided with fixed jaw which give to the work piece an adjustable force downward and with two spoon sensors at the movable and fixed jaws which give the alarm if there is spoon on the fastening plane under the work piece. The vice with automatic positioning in x-y-direction of work pieces are not generally on the market. Automatic handling for positioning of the work piece in the machining centre can well be done with built-on positioning equipment or by measuring the position of the work piece when it is clamped in the vice. Known power actuated vices, for example US 5114126, WO 02/38340, DE 9300276U1, DE 10140191A1 and US 2008/0157454A1, can be adapted with robot controlled drive motor, motion sensor and fluid or air pressure valve for use in automatic metalworking. When the working piece need for every machining stages different y-positioning require this to the above mentioned solution good versatile positioning equipment, which can be expensive for different work pieces.

Many above mentioned power actuated vice US 5114126, WO 02/38340A1 and DE 10140191A1 use at least 3 hydraulic seals in theirs force amplifier and that need an extra hydraulic service. After a certain time when a little quantity of the hydraulic oil is pressed past the seals, caused by vibration of the work piece machining, must the oil leakage be compensated in a closed hydraulic system without automatic oil reservoir.

This automatic and pneumatic vice, according to the present invention, use only compressed air which using are unlimited and when the external control valve is open during the work piece machin- ing time causes the possible pressure air leakage not any services.

The second disadvantage with above mentioned power actuated vices arises at movable clamping jaws which move along the guide rail. The clamping force again a rough surface of the working piece can decrease caused by vibration during machining time. That clamping force correction need higher force than at beginning clamping because the end area of guide surface of clamping jaw have get good static friction which is higher than sliding friction at beginning clamping. Static and sliding friction at the end area of guide surface of clamping jaw and at thread surface of the screw drive shaft causes together a clamping force hysteresis which worse to keep up the regulated clamping force at whole machining time. That disadvantage may be small because this hysteresis belongs on length dimension of the guide surface of movable clamping jaw and on quality of the all sliding surfaces, which should be hardened and grinded.

The vices with draw-down effect of the fixed jaw are already proposed. The constructions disclosed in US 4905974(A), EP 1375069 A2 and US 2770990 (20.11.1956) are three examples. If the spring forces in these solutions works for accurate position of the work piece in clamping direction have the clamping contact line of the fixed jaw to move along the work piece during achieving this accurate position. The moving of the clamping contact elements downward on the surface of the work piece causes scratches on the finished surface of the work piece. In these accurate position have the above mentioned fixed jaw construction lost its downward forces if it should be needs dur- ing the machining of the work piece.

SUMMARY OF THE INVENTION

The object of the present invention is an automatic pneumatic vice for metal working provided with widely and quick movable clamping jaw and fixed jaw where the vertical clamping surface of the fixed jaw and the horizontal surface of the fastening plane for the working piece confirm an accurate and unchangeable X- and Z-zero plane. The clamping force amplifying solution according to this invention require larger dimension of vice frame in Y-direction than the conventional vice have. This larger deck surface of the vice frame allow 35 different mounting place for the Y-position stud, 5 in X- direction and 7 in Y-direction. Of practice reasons are the Y-studs modified to two different designs. Clamping levers supported by two parallel screw spindle which move with the moving jaw get the clamping force from a work piece fastening pneumatic cylinder. The screw spindle, connected to the fastening pneumatic cylinder, is constructed at the bearings places and at the timing pulley to move in axial direction.

The above object according to this invention is achieved by following constructional features:

- The static friction between threads of the screw drive shaft and its nut beside the movable jaw is useful because this threads work as support point to the clamping lever when the clamping force starts. - The movable clamping jaw is supported with four bearing roller to receive the twist moment from the clamping lever. Two is mounted at the end of the movable clamping jaw above the fastening plane and two is mounted on the lever arm under the fastening plane. These four support roller roll against the surface of the fastening plane.

- Connection between the screw spindle and the piston of the short stroke pneumatic cylinder allow the screw drive shaft to rotate free in the piston.

- The deck of the frame is provided with 35 alternatives places for two or one Y-position stud. The support face of the Y-position stud has 7 standard distances to the centre point of the fixed jaw to be chosen. The work piece can be placed and clamped on the fastening plane lengthways or crosswise for machining. The lengthways clamping of the work piece uses two Y-position studs and for the fairly narrow work piece can two studs with different design be used.

- The pneumatic clamp for Y-positioning can be placed and adjusted according to the work piece. The pneumatic clamp can rapidly be changed in X- and Y-direction after changing of the work pieces clamping direction.

- The grip face part of the movable clamping jaw is jointed on the base of the moving jaw to turn in horizontal plane against the rough surface of the work piece at clamping time.

The automatic pneumatic vice according to this invention can be done for two different designs. The movable clamping jaw can be placed on the lever arm outsides or insides of the screw spindle which nut work as support point for clamp work pieces. In the description of this invention are outsides placement of clamping jaw said practical design chosen and insides placement said to alternative design. Practical design has two features at the screw spindle connected to the fastening pneumatic cylinder; - coupling flange besides second timing pulley is axially moved close to during rotation of the screw spindles and - the fastening pneumatic cylinder and the timing pulley have an easier and better maintenance design.

Also the suspension of the pneumatic clamp can be adapted for different and a number of pneumatic clamps.

BRIEF DESCRIPTION OF THE DRAWINGS Preferred embodiments of the invention become subsequent described on the basis of the drawing. Here show:

Fig. 1 view from above of automatic pneumatic vice with ordinary design

Fig. 2 view from above of automatic pneumatic vice with alternative design

Fig. 3 end view from direction A - A of practical designed vice Fig. 4 functional cross section B - B of practical designed vice

Fig. 5 enlargements of place L in fig.4 of practical designed vice

Fig. 6 cross section M - M of place L in fig.5 of practical designed vice

Fig. 7 functional cross section B - B of alternative designed vice

Fig. 8 enlargements of place N in fig.7 of alternative designed vice

Fig. 9 cross section C - C of fixed jaw

Fig. 10 cross section D - D of lever arms swivel joints

Fig. 11 cross section E - E and front view of movable clamping jaw

Fig. 12 cross section H - H of support roll

Fig. 13 cross section F - F, center section of movable clamping jaw

Fig. 14 cross section G - G of movable clamping jaws support roll

Fig. 15a and Fig. 15b enlargements of area J at fixed jaw

Fig. 16 cross section K - K of figure 15a

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Two different possible embodiment of the automatic pneumatic vice in accordance with the present invention are shown in Fig. 1, Fig. 2, Fig. 4, Fig. 5, Fig. 7 and Fig. 8 with practical or alternative designs.

Figures 1 and 3 show a practical designed vise with following component; a box formed body (1), a body deck (2) which face is provided with a longitudinal aperture for movable jaw and with many accurate longitudinal grooves adapted for y-positioning studs, two fastening plane (3) besides the longitudinal aperture, two or more Y-positioning studs (4) with extended form for lengthwise placed narrow work piece, one or more Y-positioning stud (5) with standard form, one or more Y-direction pneumatic clamp (6), one or more suspension (7) for pneumatic clamp and its cylinder, one or more parallel clamp (8), two gripping lever (9) for each parallel clamp, three or more parallel rod (10) for suspension of pneumatic clamp, one or more pneumatic cylinder (11) for Y-positioning, a timing belt drive unit (12), a drive motor (13) with worm gear, a fastening pneumatic cylinder (14), a movable clamping jaw (15) and a fixed jaw (16).

Figure 2 show an alternative designed vise where different component are box formed body (1) and timing belt drive unit (12).

Different between the head construction of practical and alternative designs is shown in five functional figures 4, 5, 6, 7 and 8. Two screw spindles (17) and (18a) or (18b) are parallel mounted by bearings in the body box (1). Screw spindle (17) is radial supported by bearings (21) at the fixed end, figure 4, and by a bearing (22), a bearing bush (23), and an end washer (24) at the free end, figure 9. The axial force from screw spindle (17) is carried by a thrust bush (19) and a thrust bearing (20). Axial movable screw spindle (18a) or (18b) is radial supported in the timing pulley end (70) by bearing bush (26) with bearing (25) and in the pneumatic cylinder end (14) by a bearing bush (28) with a bearing (27), fig. 4 and 7.

Nut (29) mounted on screw spindle (17) is formed on its upper side to a tap where clamping lever (30a) or (30b) is swivel connected by a bearing bush (31). In both vice according to this invention with practical design or alternative design are axial movable screw spindle (18a) and clamping lever (30a), fig. 4 and 5, designed differently than screw spindle (18b) and clamping lever (30b), fig. 7 and 8. The following components are shown for practical design in figures 9, 10, 11, 12, 13 and 14.

Nut (32) mounted on screw spindle (18a) is mounted at its upper side tap by a bearing bush (33) into a sliding block (34) with square form. The smaller fork end of the clamping lever (30a) or (30b) is supported on both sides by two flange of the sliding block (34) and by a round flange (35), figure 10. A turn base (40) of the movable clamping jaw (15) is connected to bigger fork formed end of the clamping lever (30a) by a sliding block (36), an adapter tap (37), a joint bush (38) and a fastening screw (39), figure 10.

The movable clamping jaw (15) consist of; a turn base (40), two bearing bushes (41), two joint screws (42), a up-down base (43) and a gripping list (44) mounted by screws on the up-down base, fig. 11. The up-down base (43) is jointed by bearing bush (41) and joint screws (42) to move in up and down direction at the joint links in the both end of turn base (40), figures 11 and 14. Two springs (45) restore the up-down motion to its upper position of the gripping list where two screws (46) limit the upper position, fig. 11.

The fixed jaw (16) consist of; a gripping list (44) mounted on a lever base (47) and two on the vice body (1) by screw (55) mounted support base (48) where the lever base (47) is hinged by two spring- loaded screws (82) and theirs adjusting nut (83), figures 9, 15a and 16. The clamping surface of gripping list (44) is also provided with an up-down motion where two push tap (49) and two check screws (50) held the gripping list (44) in its upper position by force of the cup springs (51) seated on both push tap (49). Two stop screws (52) against inner wall of the body (1) adjust the fixed jaw (16) to its right position, fig. 9. The right position is reached when clamping surface of the gripping list (44) is accurately at right-angle to fastening plane (3) and point (p) at both end of the lever base (47) has contact against the support base (48). The check screws (50) suited in two adjusting base (53) are mounted by screws (54) on the back of body (1), figures 3 and 9. A turning plate (56) with round hole is turning able mounted on the clamping lever (30a) under the adapter tap (37) with round shoulder. A spring screw (57) with a horizontal round pin at the bottom end is mounted under turn base (40). On the round pin are two coil springs (58) mounted between the side walls of turning plate (56) which limit horizontal turning of the movable clamping jaw (15), figures 13, 5 and 8.

The turning plate (56) keeps in same direction with the screw spindle (17) by two on turning plate (56) fixed aligning pin (59), figures 4 and 11.

The movable clamping jaw (15) is provided with two supporting roller (60) mounted at the end of the turn base (40) by a bushing (61), a bearing Journal (62) and a roller clevis (63), figure 12, 5, 6 and 8. Same supporting roller (60) with bushing (61) and bearing journal (62) are mounted on the clamping lever (33a) against the lower surface of fastening plane (3) by a own roller clevis (64) to avoid twist elasticity from clamping force, figures 5, 6, 8, 11 and 14.

The drive unit (12) consists of; timing pulleys, a timing belt, two couplings, a pulley assembly (77) for tighten the timing belt (76) (not shown in detail) and mounting parts of the timing pulleys.

First timing pulley (65) is fixed by a key on screw spindle (17) beside a spacer ring (66). The first timing pulley (65) is pressed against thrust bush (19) by an end screw and a support cap (67). Two coupling shaft (68) fixed in the first timing pulley (65) are suited in two rubber bushing of first coupling (69).

Second timing pulley (70) is axially movable mounted on the screw spindle (18a) by a bearing bush (71). Second coupling (72) with flange is fixed by an end screw and a key against a shoulder of screw spindle (18a). Second timing pulley (70) is provided with two axially bushing (73) where two dowel pins (74), well fixed on the flange part of second coupling (72), are accurately mounted through these bushings, figures 4 and 7. A locating piece (75) keeps the second timing pulley (70) in its place when the screw spindle (18a) or (18b) makes its clamp moving, figures 4 and 7. The short stroke pneumatic cylinder (14) is provided with two-part piston (78) which possible a closed space to the rotary push flange (79) and an easy mounting of the two piston sealing, figures 4 and 7. A tight sealing sleeve (80) with low friction mounted under two O-ring seal work as piston rod sealing against the ground surface end of screw spindle (18a). Two pneumatic fittings (81) are mounted on the fastening pneumatic cylinder (14), figure 4.

In the alternative designed vice has screw spindle (18b) a different connecting to fastening pneumatic cylinder (14), figure 7. The tight sealing sleeve (80) is there mounted on two plain bearing. The coupling (72) is there fixed against shoulder of the screw spindle (18b) by these two plain bearing, figure 7. In the operation before the machining session are the pneumatic clamp (6) adjusted in a places to move the work piece against the Y-positioning studs (4) or (5) which are mounted in a places where they adapt the work piece best, figures 1 and 2. A programmed logic unit which automatically uses the pneumatic valves for control the pressure air to the fastening pneumatic cylinder (14) and to pneumatic clamp (6) is with the pneumatic valves an outer part of the automatic pneumatic vice in accordance with the present invention. In an automatic machining session uses the machining centre this programmed logic unit which even control the work piece handling manipulator or robot.

When the work piece is placed by the robot or manipulator in X-direction nearly the front face of the fixed jaw (16) and in Y-direction nearly the Y-position line change the valve of the pneumatic clamp (6) pressures airs into the clamping side and the pneumatic clamp (6) moves the work piece against the studs (4) or (5), figures 1 and 2. In the same time, or two second after before mentioned valve work, start the drive motor (13) by impulse from the programmed logic unit and the timing belt drive unit (12) begin rotate the screw spindles (17) and (18a) or (18b) in counter-clockwise direction which move the movable jaw (15) against the work piece, figure 4 or 7. The pneumatic clamp (6) keep the work piece against the studs (4) or (5) when the movable jaw (15) move the work piece against the fixed jaw (16), figures 1 and 2.

After a chosen time stop the programmed logic unit the drive motor (13) which stop a light press of the work piece against the fixed jaw (16) but the pneumatic clamp (6) keep the work piece against studs (4) or (5) until the machining starts. In the same time when the drive motor (13) is stopped change the valve of the pneumatic cylinder (14) pressures airs into the clamping side, and the piston (78) begin pushing the screw spindle (18a) which according to figure 4 is to left or screw spindle (18b) to right in according to figure 7.

With the screw spindle (18a) or (18b) moves the nut (32) and on its upper side mounted sliding block (34) which turn the smaller fork end of clamping lever (30a) to left according to fig. 4, or clamping lever (30b) to right according to figure 7.

When the clamping lever (30a) according to the figure 4 is pressed to turn clockwise with turning point swivel tap of the nut (29) mounted on the screw spindle (17), turn the bigger fork end of the clamping lever (30a) to right, figures 4 and 5. That clockwise turning of clamping lever (30a) move the sliding block (36) and adapter tap (37) to right and press the movable jaw (15) against the work piece with force which belong of ratio between the lever dimensions, in practice 6 to 10 times the force from the pneumatic cylinder (14). The clamping lever (30b) according to the figure 7 is instead pressed to turn counter-clockwise with same turning point swivel tap of the nut (29) mounted on the screw spindle (17) which move the same adapter tap (37) to right and press the movable jaw (15) against the work piece.

After a chosen time return the pneumatic clamp (6) to its open position and the machining of the work piece can starts.

When the work piece had to be turn in the vice between the machining phase start the open procedures first by changing the pressure air into the return side of fastening pneumatic cylinder (14) which make to the screw spindle (18a) or (18b) return moving and the clamping force get off against the work piece.

In the next step, after a chosen time from control of the valve for the pneumatic cylinder (14), give the programmed logic unit impulse to the drive motor (13) to start in the opposite direction which gives the screw spindles (17) and (18a) or (18b) clockwise rotation. Clockwise rotation according to the figure 4 or figure 7 moves the clamping lever (30a) or (30b) to left and move the movable jaw (15) away from the work piece.

Work time of the drive motor (13) is also chosen in the programmed logic unit. After turning procedures and placing of the work piece on the present vice can the clamping procedure start as mentioned before.

The operations at the clamping and open direction of the present vice are closer explained in the following with reference to figures 9, 10, 11, 12, 13, 14, 15a, 15b and 16. When movable jaw (15) moves towards or away from fixed jaw (16) appear no noteworthy load on the bearings (31) and (33) at the nuts (29) and (32), figure 10. Only forces rises from the threads of the nuts (29) and (32) where the friction between the screws spindles (17) and (18a) and theirs nuts (29) and (32) strives to rotate the nuts with the screw spindles. The clamping lever (30a) hold the nut (29) on screw spindle (17) in this right direction and lower flange of the sliding block (34) with round flange (35) keep the nut (32) on screw spindle (18a) in this right direction, figure 10.

When movable jaw (15) moves a heavy work piece towards fixed jaw (16) appear a load, but not a heavy load, at the bearing (31) which strive to bend the nut (29) in axial direction, but both thread friction at the screw spindles (17) and (18a) caused of this bending moment not rise over the capacity of the drive motor (13), figure 10.

The movable jaw (15) and. the fork end of the clamping lever (30a) are equipped with 4 support roller (60) to take up the bending moment which appears between the gripping list (44) and the clamping lever (30a), figures 5, 6, 12 and 14. The same support roller (60) are dimensioned to take up the full load of this bending moment from the movable jaw (15) during the clamping action where the clamping forces are in practice 6 to 10 times the pneumatic force from fastening pneumatic cylinder (14). Two support roller equipment (clevis 63, roller 60, bearing 61 and journal 62) parts of turn base (40) of the movable jaw (15) take its support against the upper face of the fastening plane (3). The second two support roller equipment (clevis 64, roller 60, bearing 61 and journal 62) parts of the clamping lever (30a) take its support against the under face of the fastening plane (3), figures 6, 11, 12 and 14.

During the clamping action causes the clearance between the turn base (40) and the joint bush (41) and the clearance between the clamping lever (30a) and the sliding block (36) together with elasticity of this 4 parts a little inclination backwards to the movable jaw (15) so that the bottom surface of the turn base (40) is not parallel with the surface of the fastening plane (3), figures 6 and 13.

This inclination of the turn base (40) is not a disadvantage because the gripping list (44) fasten on the up-down base (43) can turn in opposite direction by two joint screws (42) mounted on the end of the turn base (40), figures 11 and 13. The space, marked with (s) in the figure 13, which allow the downward turning can be adjusted by screw (46) in the vertical direction, figure 11. The spring (45) keep the upper side of the gripping list (44) in horizontal direction, figure 11.

Whole movable jaw (15) with its gripping list (44) can turn against a rough surface of the work piece which isn't parallel with the opposite side of the work piece by turning the turn base (40) in the horizontal plane around the joint bush (38), figure 13.

Along with the horizontal turning of turn base (40) press the spring screw (57) mounted on the lower side of the turn base (40) against a spiral spring (58) which is mounted in the turning plate (56), figures 5 and 13. The turning plate (56) have two side wall against the spiral spring (58) and the two aligning pins (59) keep the turning plate (56) in the same direction with the clamp moving when the movable jaw (40, 43, 44) turn against the work piece, figures 5, 6 and 13.

The sliding block (36), the adapter tap (37) and the joint bush (38) form together a solid 3-parts up- right by the screw (39) where the space between shoulder of the sliding block (36) and the bottom shoulder of the adapter tap (37) allow the turning plate (56) to turn around the adapter tap (37) and the sliding block (36) to move in the fork end of the clamping lever (30a), figure 13. The upper end of the adapter tap (37) is formed to a larger diameter which fit the upright (36, 37, 38) and guide the movable jaw (15) between the insides of fastening planes (3), marked with (mg) in figure 10. The position of the joint screws (42) in relation to the clamping face of the gripping list (15), measures (d) and (e) must be chosen that force downward a resultant of clamping force not move the gripping list (44) downward along the surface of the work piece. This mean that measures (e) divided with measures (d) is same as friction coefficient between the gripping list, hard ground steel, and work piece of metal under cutting fluid circumstance which in practice is about (0,15), figure 13. The friction between the joint screw (42) and the bearing bush (41), about (0,05) and force of the spring (45) can together by a test allow a higher ratio between (d) and (e) than (0,15), figures 11 and 13. The force downward at the clamping surface of the gripping list should be about 0,07...0,08 times the clamping force against the working piece. The fixed jaw (16) has a construction where the force downward can be adjusted according to materials of the working piece for achieve a same force about 0,07...0,08 times the clamping force against the working piece, figures 1, 2 and 9. The fixed jaw hasn't a joint screw (42) but instead a solution without joint friction in practice. Two horizontal edges (p) on the both end of the lever base (47) works as horizontal down turning line for whole fixed jaw. The cylindrical surfaces above the edges (p) marked with (cs) on lever base (47) and support base (48) take up the clamping force, figures 15a and 15b. The fixed jaw (16), gripping list and lever base, is positioned by two stop screws (52) so that the vertical clamping surface of the gripping list (44) is accurately at right-angle with the fastening plane (3). Suitable force from the cup springs (51) is that ~50% of the maximum clamping force acted against the lower end of the gripping list (44) keeps the fixed jaw (16) at the upper position, figure 9. The possible up-down motion is small about 2,1° in accordance with the present design, figure 9. In the figure 15b is the up-down motion exaggerated to 5°. A rough work piece which touches the gripping list at the lower end of the gripping list (44) could move the fixed jaw from its upper position during maximum clamping force, but in practices has the lower edge of the gripping list made caught against the work piece which keeps the fixed jaw in its upper position.

Claims

1. A pneumatic vice for automatic metalworking comprising; - a body box (1) with a lower deck (2) and two upper deck said fastening plane (3) where the lower deck is provided with an aperture for movable jaw (15), - 35 places for Y-positioning studs (4) and (5) designed on the lower deck , - a first screw spindle (17) parallel mounted with the deck aperture in the body box by bearings and placed nearly the deck aperture on this insides, - a second screw spindle (18a) parallel mounted with the deck aperture in the body box by bearings with a lever arm distance from said first screw spindle, - two nuts first (29) and second (32) provided with upper bearings dowels where the first nut (29) is mounted on said first screw spindle (17) and the second nut (32) on said second (18a) screw spindle straight opposite of the first nut (29), - a clamping lever (30a) with turning point mounted by bearing (31) on said first nut (29) beside fork formed first lever end which is placed under the deck aperture and with fork formed second end of clamping lever mounted by bearing (33) and sliding block (34) on said second nut (32), - a movable jaw (15) slip fitted mounted with its guided-motion means (36, 37, 38) on the first fork end of the clamping lever (30a) and provided with its own support means (60... 64), - a fixed jaw (16) solid mounted on the body box at the end of the deck aperture, - a driving unit (12) and (13) mounted on the body box on the opposite side of the fixed jaw, - two timing pulleys (65 and 70) of the driving unit mounted on the end of said first and second screw spindles, - a pneumatic cylinder (14) mounted on the same side as fixed jaw and connected to second end of said second screw spindle (18a) by free rotating means (79) characterized in that only guided-motion means (36, 37 and 38) mounted on the clamping lever (30a) move and give clamping force to the movable jaw (15) and that distance between said first (17) and second (18a) screw spindles in relation to distance between turning point of lever arm, fixed on said first nut (29) of said first screw spindle (17), and guided motion means of movable jaw amplifier the power from the pneumatic cyl- inder (14) which give a axial motion to said second screw spindle (18a) for the needed clamping force.

2. A pneumatic vice for automatic metalworking comprising;- a body box (1) with a lower deck (2) and two upper deck said fastening plane (3) where the lower deck is provided with an aperture for movable jaw (15),- 35 places for Y-positioning studs (4) and (5) designed on the lower deck , - a first screw spindle (17) parallel mounted with the deck aperture in the body box by bearings and placed nearly the deck aperture on this outsides, - a second screw spindle (18b) parallel mounted with the deck aperture in the body box by bearings with a lever arm distance from the deck aperture, - two nuts first (29) and second (32) provided with upper bearings dowels where the first nut (29) is moun- ted on said first screw spindle (17) and the second nut (32) on said second (18b) screw spindle straight opposite of the first nut (29), - a clamping lever (30b) with turning point mounted by bearing (31) on said first nut (29) in the end of the clamping lever besides its oval hole placed under the deck aperture and with fork formed second end of clamping lever mounted by bearing (33) and sliding block (34) on said second nut (32), - a movable jaw (15) slip fitted mounted with its guided-motion means (36, 37, 38) on the oval hole of the clamping lever and provided with its own support means (60... 64), - a fixed jaw (16) solid mounted on the body box at the end of the deck aperture,- a driving unit (12) and (13) mounted on the body box on the opposite side of the fixed jaw, - two timing pulleys (65 and 70) of the driving unit mounted on the end of said first and second screw spindles, - a pneumatic cylinder (14) mounted on the same side as fixed jaw and connected to second end of said second screw spindle (18b) by free rotating means (79) characterized in that only guided- motion means (36, 37 and 38) mounted on clamping lever (30b) move and give clamping force to the movable jaw (15) and that distance between said first (17) and second (18b) screw spindles in relation to distance between turning point of lever arm, fixed on said first nut (29) of said first screw spindle (17), and guided motion means of movable jaw amplify the power from the pneumatic cylin- der (14) which give a axial motion to said second screw spindle (18b) for the needed clamping force.

3. The pneumatic vice for automatic metalworking according to claim 1 and 2, characterized in that the guided-motion means is a solid 3-parts upright where the lower part a sliding block (36) is formed to slide in the bigger fork formed end of the clamping lever (30a) or (30b), the middle part said adapter tap (37) which upper end carry the movable jaw (15) and get the guiding along the accurate grinded inner sides of said fastening plane (3) and the upper part said joint bush (38) which enable the movable jaw (15) to turn in horizontal plane against the work piece.

4. The pneumatic vice for automatic metalworking according to claim 1 and 2, characterized in that the support means comprising of four (4) rolls (60) with bearings (61), bearing journals (62) and roller clevis (63) and (64) where two support means are mounted against upper side of said fastening plane (3) and two support means are mounted on clamping lever (30a) or (30b) against underside of said fastening plane (3) for taking up bending moment which clamping force from clamping lever (30a) or (30b) causes to the clamping front face of the movable jaw (15).

5. The pneumatic vice for automatic metalworking according to claim 1 and 2, characterized in that the moving jaw, comprising of turn base (40), up-down base (43) and gripping list (44), by two horizontal joint screws (42) mounted on the both end of the turn base (40) can correct the position of the gripping list (44) which a backwards inclination causes to the movable jaw (15) during the bending moment from clamping force of the clamping lever (30a) or (30b).

6. The pneumatic vice for automatic metalworking according to claim 1 and 2, cha racterized i n that the fixed jaw (16) which side ends of the lever base (47) above the upper edge of the gripping list (44) is formed with two horizontal cylindrical surfaces (cs) against two similar surfaces in the support base (48) and where turning edge (p) a lower horizontal line of the cylindrical surface (cs) is placed with distance (a) for giving a downward force to the gripping list (44).

7. Fixed jaw according to claim 6, c ha ra cterized i n t hat the lever arm of the lever base (47) have a spring force distance (c) where two push tap (49) with for example 24 cup springs (51) on each push tap produce together spring force which adjusted by the check screws (50) hold the grip- ping list (44) in its adjusted ground position against two stop screw (52) and th at the friction between the work piece and the gripping list during clamping force help to keep the ground position of the gripping list when the work piece is well against the fastening plane (3).

8. The pneumatic vice for automatic metalworking according to claim 1 and 2, cha racterized i n that the said second timing pulley (70) is mounted on end of said second screw spindle (18a) or

(18b) with its fix mounted coupling (72) by two dowel pins (74) tightly fixed on the flange part of the coupling (72) and movable suited in two bushing (73) axially fixed in said second timing pulley which in addition is provided with a fixed locating piece (75) to keeps the second timing pulley (70) on its place when said second screw spindle (18a) or (18b) makes its clamp moving in axial direction.

9. The pneumatic vice for automatic metalworking according to claim 1 and 2, characte rized i n that the free rotating means at fastening pneumatic cylinder (14) comprising of a two part piston (78) and a rotary push flange (79) where the rotary push flange is direct solid mounted on the end of said second screw spindle (18a) or (18b) and have a suitable clearance in the two part piston (78) which allow the two part piston to stay without rotation during moving of the movable jaw (15).

10. The pneumatic vice for automatic metalworking according to claim 2, cha racterized i n th at the coupling (72) fixed by two plain bearing and rotary push flange (79) on the screw spindle (18b) at fastening pneumatic cylinder (14) is pressed by end washer and end screw of rotary push flange against the shoulder of the screw spindle (18b).