JP3359384B2 - Bar guide device for machine tool bar feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bar guide device for a bar feeder in a machine tool.

[0002]

As is known, in the field of machining it is necessary to guide a bar both along its direction of travel and along its direction of rotation.

It is necessary to form longitudinal slots in order to allow the passage of the element to couple the bar pusher to the conversion train.

Another problem is that when the diameter of the bar changes, the diameter of the channel guiding the bar changes in order to avoid excessive play causing the bar to change.

It is an object of the present invention to provide a device which is used quickly and safely for guiding bars having different diameters within the tolerance play. Within the scope of this aspect, it is an object of the present invention to provide a device which allows the bar pusher to be advanced without the need for a continuous slot for the passage of the component to connect the bar pusher to the conversion train. .

[0006] With regard to the foregoing and other objects of the present invention, there is provided an apparatus formed within the scope of the claims.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS The features of the present invention will become apparent from the following description of an embodiment thereof, given only by way of non-limiting example in the accompanying drawings, in which: FIG.

With reference to the drawings, the device generally designated by the reference numeral 1 has a plurality of guide units 2 distributed longitudinally.

Each guide unit 2 comprises a pair of sprockets rotatably supported by respective parallel shafts 5 and 6 projecting from a stationary support framework (not shown in FIGS. 1 to 6). The stationary support framework is constituted by a central axis, for example, the axis designated by reference numeral 106 in the embodiment of FIG. The sprockets 3 and 4 have parts 7 and 8 which form a constantly intermeshing gear with a cylindrical tongue 9 and a toothed pinion 10 on one side.

The rack 11 is guided between the pinion 10 and the tongue 9, and has a back portion which engages with the pinion 10 and tangents to the tongue 9. Opposite to the gears 7 and 8 are collars 7a and 8a having a diameter smaller than the mutual distance of their axes, forming slots through which elements for coupling the bar pusher to the conversion train can pass.

A polygonal groove is formed in the peripheral region of the sprocket 3 and forms a plurality of grooves 12,13,14,15 and 16 which form the sides of the polygonal groove and are distributed at equal angles around the axis 5. Have.

The grooves 13 to 16 have a semi-cylindrical cross-section, their axes being perpendicular to the axis of the shaft 5,
They are arranged on the same plane. Further, grooves 13 to 16
Increases from the groove 13 to the groove 16. Unlike the others, the groove 12 is different from the semi-cylindrical shape, but is opened by a flat part 17 parallel to the axis 5 and cuts the collar 7a. The sprocket 4 also has a peripheral polygonal groove with the same plurality of grooves arranged symmetrically with respect to the grooves 12 to 16 and supported by the same reference numerals.

The engagement of the gears 7 and 8 is arranged such that the grooves 12 to 16 of the sprocket 3 face the respective recesses 12 to 16 of the sprocket 4 during rotation of the sprockets 3 and 4.

Thus, a groove or opening 18 having a diameter corresponding to the diameter of the groove located on the opposite side is formed at each moment. In particular, when the groove 12 is arranged opposite the sprockets 3 and 4, an open channel 19 having a wall formed by a flattened portion 17
Is formed.

The operation of the above-described device will become apparent from an observation of FIGS.

In the operating position of FIG. 1, the rack 11 operates such that the grooves 12 face each other to form a groove 19 between the sprockets 3 and 4.

In this state, the bars 20 which are fed towards the machine tool by means of a suitable bar pusher can be inserted into the grooves 19 of the various units 2. When the bar 20 is inserted into the groove 19 of the guide unit 2,
The rack 11 is operated to rotate the sprockets 3 and 4 until a channel whose diameter is slightly larger than the diameter of the bar 20 is closed. In the drawings, it is assumed that the groove is formed by a groove 16. The radial movement of the bar is effectively prevented by the closing of the groove, but the bar is guided slidably in the longitudinal direction for feeding towards the machine tool.

The difference in diameter between the grooves 12-16 is such that when properly chamfered, the bar 20 inserted into the groove 19 rises within the selected groove when the sprockets 3 and 4 rotate. It should be noted that there is a corner that acts as a ramp at the bottom. As can be seen, a slot allowing passage of the coupling element of the bar pusher is left between the collars 7a and 8a.

The embodiment of FIGS. 7 to 13 is provided for guiding and feeding small diameter bars and has the advantage of reducing noise.

In the embodiment of FIGS. 7 to 13, the device comprises a plurality of guide units 10 distributed longitudinally.
One.

Each guide unit 101 is formed symmetrically with respect to a longitudinal center line plane C and formed by a pair of sprockets 102 and 103 rotatably supported on respective parallel shafts 104 and 105. (See FIG. 11), the parallel axes 104 and 105
6 protrudes. For example, the base 106 is a drum rotatable around a central longitudinal axis,
Various guide units of different sizes for the various guide bars are arranged on the surface.

The peripheral grooves 107 and 108 correspond to the sprocket 1
02 and 103, two toothed collars 109
And 111 and 112 are restricted. For convenience of explanation, the toothed collars 109 and 111 are referred to as “upper collars” with respect to the surface 113 of the
10, 112 are referred to as "lower collars".

The grooves 107 and 108 have a polygonal shape. Because they have a plurality of semi-cylindrical grooves 107a, 1
07b, 107c, 107d and 107e and 108
a, 108b, 108c, 108d, 108e,
These have a common plane axis perpendicular to the axes 104 and 105, around which the grooves 107 and 108 form the same angle so that the depth increases along the circumferential direction. Distributed.

Toothed collars 109, 111 and 11
0,112 mesh with each other and one sprocket 1
02 of the sprocket 103 having the same diameter so as to surround the circular opening.
8a-108e, and the diameter of the circular opening corresponds to the diameter of the opposing groove.

The deepest grooves 107a, 107 different from other grooves
8a is not semi-cylindrical but has upper collars 109 and 11
It is opened by chamfers 114, 115 which extend slightly towards the ends of the shafts 104, 105 which affect the first. Further, the lower collars 110 and 112 are
It has surfaces 114a and 115a parallel to 7a and 108a. (The two sprockets are spaced at locations where they do not engage for simplicity of the drawing.) As clearly shown in the plan view of FIG.
5 with respect to the plane of each surface 114a, 115a
The grooves 107a are slightly inclined with respect to the direction of the grooves 107a. The upwardly open sheet into which the bar to be machined can be inserted is restricted to the angular position of the sprocket with the chamfers 114, 115 parallel to the plane C of the longitudinal center line. In this position, the surfaces 114a, 11
5a and the grooves 107a and 108a converge in the forward direction A (see FIG. 12).

Between the lower collars 110, 112 and the surface 113, there are pinions 117, 118 having a smaller diameter than the collars 110, 112.

Each of the two racks 119, 120 engages with a pinion 117, 118 and engages with a surface 113 of the base 106.
Are formed on the side walls of a sliding block that slides in a complementary shape formed in the longitudinal direction.

The sliding block 121 has a U-shaped cross section and has two mutually parallel walls 123, 124 on the outer surface of which a rack is formed, said walls being laterally limited by grooves 125. , From the plane 126. The plane 126 is
It slides appropriately over a strip positioned to cover the bottom of slot 122.

The two longitudinal holes 128, 129 correspond to groove 1
25 is formed in a plane on the side. The holes 128 in the sliding block 121 are aligned and the rod 130 is driven through them, said rod being actuatable in direction A by a pneumatic or hydraulic jack 131 for the biasing action of the return spring 132. The collar 133 is the rod 13
0, and the jack 131 is
When actuating 0, it acts as an actuating element for the sliding block 121. A spring 134 is disposed between the sliding block 121 and the collar 133 downstream of the collar and holds the sliding block against a collar disposed upstream. A contact portion 130a is provided at the end of the rod 130, and the operation of the jack 131 is completed.
When the rod 130 is moved rearward by the spring 132 in a direction opposite to the direction A, it interacts with one of the pins 134 selected. Therefore, the pin 134 is positioned such that the angular position of the sprocket is such that the grooves 107a-107e and 108
The slide block is stopped at the point where a to 108e are set to positions facing each other.

The rod 135 is driven in only a few holes 129 of the first unit 101 and the collar 136
Are fixed on the rod along a portion arranged between the units 101. The rod 135 can be operated by the jack 137 so as to move the sliding block 121 in the same direction A independently of the operation of the jack 131.

The plate-like pole 139 is a pivot 1
It is rotated in each sliding block by 38 and is accommodated in a sheet 140 formed on the inner surface of the wall 123.

The pole 139 (see FIG. 10) consists of an arm 141 with teeth projecting through a slot 143 in the base plate 126 of the sliding block 121. The pole 139 is provided with a spring 144 so that at a given longitudinal position of the sliding block 121, the teeth can pass through the slot 143 and engage the opening 145 formed in the strip 127 at each guide unit 101. Is actuated against the base plate 126.

The pole 139 has a second arm 146 projecting from the seat 140 and terminating in a tab 147 in which a groove 148 is formed, said groove 148 being Z-shaped,
The two parallel horizontal parts are steps 149 and 15
Are joined by a substantially vertical portion forming two abutments formed by zeros. The pin 151 is engaged in the groove 148, and the coupling element 15 of the pusher is engaged.
Rod 154 from the third rib 152 or for bar advance
(See FIG. 8).

To allow passage of the tabs 147 under the pins 151 and sprockets 102, the lower collar 1
The ten ramps 154a are removed. The connecting element 153 has a slider 155 guided in an element with a U-shaped profile extending along the groove 125 of the sliding block 121. The slider 155 has a rib 152
And the bar pusher rod 154 is connected to a protruding bush 157. The diameter of the bush 157 is the largest in the grooves 107a, 108a.
Equal to the largest diameter formed by the mutually opposing arrangements. The passage 158 is formed in the slider 155,
Crossed by straight overlapping portions of a belt 159 for phasing the bar pushers, the upper portion of said belt being fixed to a slider.

In the contour element 156 the belt 159
Travels, and the belt 159 is driven by a plurality of guide pulleys 160 a, 160 b, 16
It is wound in a loop around 0c and 161a, 161b and 162.

The operation of the above-described device is as follows.

Assume that the sprocket grooves 107e, 108e having the smallest diameter are directed towards a machine toolbar having a diameter equal to the opening obtained by arranging them opposite each other. Pin 134 is selected for this purpose. Due to the spring 132, the pin stops the rod 130a at a position where the grooves 107e, 108e are arranged to face each other.
In this state, the spring 134 holds the sliding block so as to abut on the collar 133.

Assuming that the bar pusher 154 is in the retracted position, the first of the entire bar is loaded between the sprockets of the guide unit. For this purpose,
By operating the sliding block 121, the collar 13
The rod is actuated so that 3 slides all the sliding blocks simultaneously and the chamfers 114, 115 rotate the sprocket to the position facing each other. As shown in FIG. 12, the surfaces 114a and 115a form a sharp angle in the direction A.

Since the chamfers 114, 115 are parallel at this position, a bar can be inserted between them.

When the jack 131 operates, the spring 13
2 returns the rod 130 so as to contact the pin 134, and the sprocket 102,
The sliding block 121 is moved to a predetermined position by rotation of the sliding block 121.
Are stopped, and the grooves 107e, 108e capable of providing the best guidance of the bar are opposed to each other.

The diameter of the groove guides the bar with the smallest possible play and is usually the most suitable among those available to allow advancement of the bar pusher, which at the same time has a larger diameter than the bar. It should be noted that there is.

When the loading is completed, the bar is inserted into the groove 1 of the sprocket.
07e, 108e, and then move the motor 16 so as to cause advancement of the bar pusher 154 through the guide unit.
3 are actuated, grooves 107 having the largest diameter and forming passage channels of the bushing 157 of the bar pusher
a, 108a so that the surfaces 114a, 11a face each other.
The wedge effect exerted by the ribs 152 in 5a causes the sprocket to be momentarily oriented. As soon as the preliminary angular positioning of the sprocket by the ribs 152 has been completed, the pins 151 of the coupling element 153 enter the grooves 148 of the pawl 139 and abut the step 149 (see FIG. 9).

The pole is prevented from rotating by the teeth abutting on the strip 127.
21 is moved in response to the operation of the spring 134, which causes the sprockets 102, 103 to rotate. When the tooth 142 reaches the opening 145, it is added by the pin 151,
The thrust in combination with the thrust of the spring 144 engages the teeth 142 in the openings 145, raises the tabs 147, and allows the pins 151 to disengage from the steps 149 and protrude forward (see FIG. 10).

The teeth 142 are formed in the opening 1 by a spring 144.
45, the slot 116 is formed at this position, and the grooves 107a and 108a face each other.
The connection element 153 is connected to the associated guidance unit 101
Through which the stroke can continue.

The operation described above is repeated for all intersecting units, which are all in the open position at the end of the bar pusher advance.

The initial state is restored during the return stroke of the bar pusher. During return stroke, fact pin 15
1 enters the groove 148 on the opposite side so that the pin 1
51 abuts step 150 and swings pawl 139, at which point step 149 is held on pin 151 by spring 134 which has been previously pushed by the forward stroke of sliding block 121.

Thus, during the return stroke of the bar pusher, the sliding block does not stop at the initial position, but is subsequently conveyed backward following the movement of the belt 159. The above-described device fully achieves its intended aims and objectives. In particular, it should be noted that the collars 109-112 completely close the seat for the passage of the bar, which is always completely guided by the engagement of the set of teeth.

A feature of the present invention is that the bars can be loaded from under the drum feeder as shown in FIG. In this case, the bar is held firmly in the lower guide unit, but it requires a temporary opening of the guide groove (i.e. rotation of the sprocket to a position where the grooves 107a, 108a oppose each other). When a new bar pusher rod 154 is used, it falls. The device described above comprises a jack 137 and a rod 135
Due to the traction force applied to the sliding block 121, only the guide units which allow the application of the bar pusher rod are opened, while the other guide units are kept in their closed position and are prevented from falling up . According to another embodiment of the present invention, radial holes 164 (FIG. 1)
1, 12 and 13) are formed in a plane in the middle of each sprocket and grooves 107b-107e and 108b-10
8e.

The radial holes 164 of each sprocket 102, 103 are fitted with sprocket rotating pivots 104, 10.
5 can be connected to a hole 165 formed in the radial direction.
The hole 165 is led to a hole 166 extending in the axial direction into the pivots 104 and 105, and is connected to a supply source of lubricating oil. In this way, they can supply lubricating oil only to the grooves forming the guide grooves of the bar. When the guide is opened, the grooves 107a, 107
It should be noted that there is no radial hole towards 8a.

[Brief description of the drawings]

FIG. 1 is a perspective view of the device in a position for receiving a bar.

FIG. 2 is a perspective view of the device having a bar in a guiding position.

FIG. 3 is a sectional view of the sprocket in a position for receiving a bar.

FIG. 4 is a sectional view of the sprocket at a bar guide position.

FIG. 5 is a sectional view of the sprocket taken along the plane VV of FIG. 3;

FIG. 6 is a sectional view of the sprocket taken along plane VII-VII of FIG. 4;

FIG. 7 is a side view of a different embodiment of the device.

FIG. 8 is a plan view of the device of FIG. 7;

FIG. 9 is an enlarged side view of a detailed view of the device in two operating states.

FIG. 10 is an enlarged side view of a detailed view of the device in two operating states.

FIG. 11 is a longitudinal sectional view of the device taken along a plane XI-XI of FIG. 7;

FIG. 12 is a plan view of a guide unit having a sprocket, shown partially in section, taken along plane XII-XII in FIG. 11;

FIG. 13 is a longitudinal sectional view of an embodiment providing a plurality of guide devices arranged to be inclined about a central longitudinal axis.

[Explanation of symbols]

2 Bar guide unit 3, 4 Sprocket 5, 6, 104, 105 shaft 10 Pinion 11 Rack 12-16, 107a-107e, 108a-108e
Groove

Continuation of the front page (72) Inventor Marco, Camelli, Faenza, Via, Croce, Italy, 13 (72) Inventor Enrico, Faenza, Via Nene, Italy, Via, Fraterelli, Bandiera, 14 (56) References JP 52-64075 (JP, A) JP-A-62-244530 (JP, A) U.S. Pat. No. 4,929,138 (US, A) European Patent Application Publication 574882 (EP, A1) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) B21D 43/02 B23B 13/02

Claims (10)

(57) [Claims] 1. Each unit has a parallel axis (5, 6; 10).
4,105), forming a tangential collar, a semi-cylindrical groove (12-) having an axis arranged at right angles to the sprocket rotation axis and of increasing depth in the circumferential direction. 16; 107a-107e; 1
08a-108e) comprising a plurality of longitudinally aligned bar guide units (2; 101) having a pair of sprockets (5, 6; 104, 105) with polygonal peripheral grooves. A pair of grooves having the same diameter are at mutually opposing angular positions, form a passage opening, and are arranged obliquely to guide the bar, rotating the sprocket to the mutually opposing positions. A bar guide device for a bar feeder of a machine tool, comprising: 2. A sprocket (3, 4) of each pair is provided with a toothed collar that always meshes together, one of said sprockets being a rack (11) suitable for controlling the angular positioning of said sprocket. Device according to claim 1, characterized in that it comprises a pinion (10) which engages with a pinion. 3. The collar has grooves (107a-107e; 108a-108) at positions facing each other.
e) Insertion of the bar to be machined in and a chamfer (114, 1) allowing the passage of the element (153) to connect the bar pusher (154) to the moving element.
15) and surfaces (114a, 115a), and the apparatus further comprises a sprocket (1) of each pair.
02, 103) are operable by each rack guided parallel to the direction of advancement of the bar, and a pole (139) is pivotally connected to said rack and interacts with said connecting element (153) during advancement of the bar pusher. , Causing movement of the rack (119) on which the poles are pivotally mounted, causing rotation of the sprocket from a reference position until they assume an inclined position in which the surfaces (114a, 115a) form a passage for the coupling element. And in said tilted position, said pawl (139) is adapted to assume a position disengaged from said connecting element (153) to allow advancement through said passage, during the return stroke of the bar pusher,
The apparatus of claim 1, wherein the pawl interacts with the connecting element to move the rack (119) to the sprocket reference position. 4. The rack (119, 120) comprises two parallel walls (123, 12) having the rack outside.
4) a sliding block having a U-shaped cross section (12)
1) and the rack is formed on a pinion (117, 1) formed on the sprocket (102, 103).
18) and forms a guide groove (125) for the bar pusher coupling element (153) on the inside, and the sliding block extends along a sliding surface (127) of the bar on which the rack is machined. The jack (131) extends over a range that rotates the sprocket between a position where the groove opens to allow loading and a position corresponding to the diameter of the bar and opposing each other to guide the bar. 4. The device according to claim 3, wherein the device is operable by: 5. A longitudinal hole (128) is formed in said sliding block (121), a rod (130) is driven through said hole, said rod being operable by a jack (131). An abutment for moving a slide block to rotate a sprocket between the loading position and the bar guide position, wherein the slide block is mounted on the rod. 5. The device according to claim 4, wherein the device is placed on and held by the contact portion. 6. A first arm (146) comprising two abutments (149, 150) for an element (151) for moving said bar pusher coupling element (153). And a second arm having teeth (142) slidable along a sliding surface (127) of the sliding block, and one of the abutting portions (149) is disposed in the forward direction A of the bar pusher. Operatively, wherein the sprocket moves the sliding block to an angular position forming a passage for the coupling element, the teeth (142) opening the opening (145) in the guide groove (125) of the sliding block. To stop the sliding block in the passage position and return the pole to a position where the teeth (142) are disengaged from the openings (145) during the return stroke of the bar pusher. Device according to claim 4, characterized in that after the mating element has passed over the passage, the pole is swung to a position where the moving element (151) engages another abutment (150). . 7. A moving rod (1) of a sliding block (121).
30) is held by a resilient device (132) against the stroke limiter (134), the stroke limiter (134) being such that the grooves having a diameter allowing the guiding of the bar to be fed are opposed to each other. 5. The apparatus according to claim 4, wherein the apparatus is selected to stop the rod at a position located at the position. 8. A second longitudinal hole (129) is formed in said sliding block (121), and a rod (135) driven through said hole is operable by a jack (137). And an abutment (136) for moving the sliding block and rotating some sprockets of the first guide unit (101) to a position for inserting the bar pusher. 5. The device of claim 4, wherein 9. The groove (12, 16; 107a-107).
e. 108a-108e) is connectable to a lubricant supply. 10. The apparatus according to claim 1, wherein the apparatus is applied to a drum type bar feeder.