JPS6345347Y2 - - Google Patents

Description

[Detailed description of the invention] This invention uses a horizontal rail and a vertical rail that are combined to be perpendicular to each other on the drawing board to measure the parallelism of the vertical scale attached to the drawing head at any point on the drawing board. In particular, regarding a fixed pitch stopping device for a drafting head in a rail-type drafting machine maintained at a drawing head, which stops the drafting head at a fixed pitch during parallel movement so as to draw equally spaced parallel lines using the vertical scale. This invention relates to a fixed pitch stopping device that is easy to operate.

In general, although mechanical drawing work always involves drawing a large number of parallel lines at a fixed pitch, conventional drawing machines are not equipped with the means to efficiently and accurately carry out this work. do not have. As a result, the operator visually checks the graduations on the vertical scale to determine the pitch and draw a large number of parallel lines. This type of work is not accurate and efficient.

Therefore, in order to accurately and efficiently draw a large number of parallel lines at regular intervals, the applicant proposed a fixed pitch stopping device for a drafting head that automatically stops the drafting head at a fixed pitch. did.

This fixed pitch stopping device moves a pitch plate fixed to a vertical rail and having fixed pitch slits arranged at a constant pitch in the longitudinal direction of the rail, and a drafting head along the longitudinal direction of the vertical rail. It consists of an engaging pawl that is fixed to the vertical carriage and engages with the fixed pitch slit of the pitch board to fix the drawing head to the vertical rail at a fixed pitch, and moves the drawing head toward the front of the drawing board. Only when the drawing head is moved, the engaging claw clicks into and out of the slit to fix the drafting head at a fixed pitch,
In order to move the drafting head forward of the drawing board, the engaging state of the engaging claw with the pitch plate must be released by rotating a knob attached to the shaft that supports the engaging claw. No.

Therefore, when repeatedly drawing parallel lines at regular intervals at arbitrary positions on the drawing board, rotate the above-mentioned knob to return the drawing head to its original position each time you draw lines at regular intervals. The reality is that the drawing head is moved forward over the drawing board, making the work complicated.

The present invention has been proposed in view of the above circumstances, and an object of the present invention is to enable a fixed pitch stop device of a drafting head to be activated or released by a simple operation.

That is, in order to achieve the above object, the present invention includes a pitch plate fixed to a vertical rail and having fixed pitch slits arranged at a constant pitch in the longitudinal direction of the rail, and a drafting head arranged in the longitudinal direction of the vertical rail. an engaging pawl that is fixed to the vertical carriage that is moved along the vertical rail and that engages with the fixed pitch slit of the pitch plate to fix the drawing head at a fixed pitch with respect to the vertical rail; and a link mechanism for engaging or disengaging the engaging pawl from the pitch plate, one end of the link mechanism serving as an engaging end for the engaging pawl, and the other end facing the drafting head. The link mechanism is characterized in that it protrudes from the top and becomes the operating end of the link mechanism, and this operating end is provided with a link operating member.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is an external plan view of a rail-type drafting machine equipped with a fixed pitch stopping device for a drafting head according to the present invention. A horizontal rail 2 is attached to the upper edge 1a of the drawing board 1 with two vises 3. A carriage 4 that can move along the longitudinal direction of the horizontal rail 2 is disposed on the horizontal rail 2. A vertical rail 5 is supported on the horizontal carriage 4, and a vertical carriage 6 that can move along the longitudinal direction of the vertical rail 5 is arranged on the vertical rail 5. At the upper and lower ends of the vertical rail 5, there are caps 5a, 5.
b is attached.

A drafting head 8 is connected to the vertical carriage 6 via a hinge member 7. This drafting head 8 has a scale mounting plate 9, a rotating main shaft (not shown) for rotationally moving the scale mounting plate 9, and a knob 1 rigidly connected to the rotating main shaft.
It has 0.

A pitch plate fixing knob 71, which will be described later, is provided on the left side surface of the vertical rail 5.

The vertical scale 11 and the horizontal scale 12 are removably mounted on the scale mounting plate 9 and are perpendicular to each other.

On the side of the knob 10, each of the scales 11,
An angle indexing lever 13 for performing 12 angle indexing operations is provided, and a protractor board 14 serving as a reference for angle indexing is disposed around the rotation main shaft.

A protractor fixing lever 15 is provided below the angle indexing lever 13 for allowing the rotary movement of the protractor 14 or for fixing the protractor 14.

As shown in Fig. 2, the vertical carriage 6 has four horizontal rollers 17 for running at the corners of the chassis 16, and a brake mechanism 20 consisting of a link mechanism. The brake mechanism 20 is structured so that the brake is applied by sliding a brake operation lever 22 provided at an operation end 21 of the link mechanism 20 to the right in Fig. 2.

Then, the chassis 16 of the vertical carriage 6 is
At the lower part in FIG. 2 (the left part in FIG. 1), there is provided an engaging pawl unit 24, which constitutes the main part of a fixed pitch stopping device 23 for fixing the drafting head 8 at a fixed pitch. It is set up.

The engaging pawl unit 24 is attached to the chassis 16 with a set screw 25 as shown in FIGS. 3 and 4.
U-shaped support frame 26 fixed by
, five first, second, third, fourth and fifth engaging claws 27, 28, 29, 30, 31, and the claw tips 27 of each of these claws 27, 28, 29, 30, 31.
a, 28a, 29a, 30a, 31a at their upper limit positions or lower limit positions. The main component is a pivot 33 for pivoting at an intermediate portion thereof.

The first engaging claw 27 is for a 2 mm pitch, the second engaging claw 28 is for a 3 mm pitch, the third engaging claw 29 is for a 5 mm pitch, and the fourth engaging claw is for a 5 mm pitch. 30 is for a 7 mm pitch, and the fifth engaging claw 31 is for a 9 mm pitch.

Further, the support frame 26 supports the pivot shaft 33 at its highest portion.

Each of the above engaging claws 27, 28, 29, 30 and 31
The claw tips 27a, 28a, 29a,
30a and 31a have triangular side surfaces as shown in FIG. 5, and a ridge portion 36 is formed by two tapered surfaces 34 and 35. The tapered surface 34
is a shape that gradually heightens toward the rear from the leading edge of the engaging claws 27, 28, 29, 30, and 31, and the tapered surface 35 has a shape that gradually heightens toward the leading edge, and is opposed to the tapered surface 34. are doing. Tapered surface 3
The slope is set smaller than the slope of No. 4.

In each of the claws 27, 28, 29, 30, 31, the claw tips 27a, 28 are relative to the pivot 33.
On the side opposite to a, 29a, 30a, 31a, a curved cam engagement protrusion 3 protrudes downward from the lower edge of each of these claws 27, 28, 29, 30, 31.
7, 38, 39, 40, and 41 are provided.

Each of the above engaging claws 27, 28, 29, 30 and 31
There are notches 42, 4 at the upper end of the proximal end of the
2, 42, 42, 42 are formed. One end 43a of a tension coil spring 43 is hooked to this notch 42. The other end 43b of the tension coil spring 43 is attached to the bottom frame 2 of the support frame 26.
It is latched to a latching piece 44 formed at 6A.

The engaging claw supporting cam 32, 32, 32, 3
2 and 32 each have the same substantially disk shape as shown in FIG. It is formed by placing In addition, in the main recess 45, each of the engaging claws 2
Claw tips 27a of 7, 28, 29, 30, 31,
The corner portion 47 on the 28a, 29a, 30a, 31a side (left side in FIG. 6) is connected to each of these cams 32, 3.
2, 32, 32, 32 in the clockwise direction in FIG.
31 cam engagement protrusions 37, 38, 39, 41,
41 is formed in a curved shape so that it can be smoothly removed from each of these recesses 45. Each of the cams 32, 32, 32, 32 is fitted into a hexagonal cam support shaft 48 and supported by the support frame 26.

An engaging pawl selection adjustment knob 49 is rigidly connected to the outer end of the cam support shaft 48.

On the other hand, as shown in FIG. 7, the vertical rail 5 has an intermediate wall 55 extending in the longitudinal direction of the vertical rail 5.
It is divided into an upper space part 56 and a lower space part 57 by a. A rib 56a extending in the longitudinal direction of the vertical rail 5 is provided downwardly on the lower surface of the intermediate wall 55a, and the vertical rail 5 is divided into left and right portions by the rib 56a. The rib 56a and the vertical rail 5 are provided on the lower surface of the intermediate wall 55a.
protrudes from the outer wall 67 toward the lower space 57,
A pair of support walls 58a and 58b are provided opposite to each other with a gap S of a constant width between them and the intermediate wall 55a.

The above-mentioned engaging claws 27, 2 are provided in the above-mentioned gap S.
8, 29, 30, 31 in a click manner to fix the vertical carriage 6, that is, the drafting head 8, to the vertical rail 5 at a fixed pitch. It is placed on each of the support walls 58a, 58b so as to be slidable. The total length of the pitch plate 60 is longer than approximately 1/2 of the total length of the vertical rail 5, and by engaging with any of the engaging claws 27, 28, 29, 30, and 31, the pitch plate 60 can be vertically moved by the vertical carriage 6. It is transported in the longitudinal direction of the rail 5.

The pitch plate 60 has first, second, third, fourth, and fifth fixed pitch slits 61 corresponding to the respective engaging claws 27, 28, 29, 30, and 31, as shown in FIG. , 62, 63, 64, and 65 are formed.

The first fixed pitch slits 61 correspond to the first engaging claws 27, and are formed at intervals of 2 mm. The second fixed pitch slits 62 correspond to the second engaging claws 28, and are formed at intervals of 3 mm. The third fixed pitch slit 63 is connected to the third engaging claw 2.
9, and are formed at intervals of 5 mm. The fourth fixed pitch slits 64 correspond to the fourth engaging claws 30 and are formed at intervals of 7 mm. The fifth fixed pitch slits 65 correspond to the fifth engaging claws 31, and are formed at intervals of 9 mm.

As shown in FIG. 9, on the outer periphery of the engaging claw selection adjustment knob 49,
Numbers corresponding to 29, 30, and 31 are provided.

Then, as shown in FIG. 9A, when the number "2" is aligned with a pointer (not shown), the cam corresponding to the first engaging pawl 27 among the cams 32, 32, 32, 32, 32 32 main recess 45 is in a state of engagement with the cam engaging protrusion 37 of the claw 27,
Only the claw tip 27a of the claw 27 is attached to the pitch plate 6.
The claw 27 protrudes toward the zero side, and the claw 27 engages and disengages from the fixed pitch slit 61 in a click-like manner. Therefore, by sliding the drawing head 8 along the vertical rail 5, parallel lines can be drawn at 2 mm intervals. FIG. 9B is a diagram showing a case where parallel lines are drawn at 3 mm intervals; in this case, only the main recess 45 of the cam 32 corresponding to the second engaging pawl 28 is connected to the cam engaging protrusion 38 of the pawl 27. They are in an engaged state. Note that FIG. 9C shows the case where parallel lines are drawn at 5 mm intervals, FIG. 9D shows the case where parallel lines are drawn at 7 mm intervals, and FIG. 9E shows the case where parallel lines are drawn at 9 mm intervals.

Further, FIG. 9F shows a case where the fixed pitch stopping operation of the drawing head 8 is released. In this case, set "0" among the numbers above to match the above guideline. Then, each of the cams 32, 32, 32, 3
2, 32, the auxiliary recess 46 is connected to each of the claws 27, 28,
29, 30, 31 cam engagement protrusions 37, 38,
39, 40, and 31, each claw 2
The claw tips 27a, 28a, 29a, 30a, and 31a of the claws 7, 28, 29, 30, and 31 are held at positions apart from the pitch plate 60, respectively. Therefore, the drafting head 8 can be freely slid.

On the other hand, a pitch plate fixing mechanism 70 for fixing the pitch plate 60 at a desired position on the vertical rail 5 is provided on the outer wall 67 of the vertical rail 5. As shown in FIG. 7, this pitch plate fixing mechanism 70 is operated by rotating a pitch plate fixing knob 71 that is arranged to protrude outward from the outer wall 67 of the vertical rail 5. be. A bracket portion 72 bulging toward the upper space 56 is formed between the intermediate wall 55a and the outer wall 67 of the vertical rail 5, and a groove 73 with a circular cross section is formed in the bracket portion 72 along the longitudinal direction of the vertical rail 5. It is formed along the direction.
Continuing from this groove 73, a groove 74 having a rectangular cross section is formed in the outer wall 67, facing the outside of the vertical rail 5, and extending along the longitudinal direction of the vertical rail 5.

A tip 76 of a screw 75 is inserted into the groove 73, and the tip 76 has a rectangular shape inscribed in the circular cross section of the groove 73. Therefore, the screw 75 cannot be rotated around its axis.

A washer 77 is disposed in the groove 74 so as to fit into the outer wall 67. A pin 79 having a minus groove 78 is fixed to this washer 77.
The washer 77 can be moved slightly in the direction of the transverse axis of the vertical rail 5, so that the pin 79 can also be projected into the lower space 57 or retracted from the lower space 57.

A pitch plate fixing knob 71 is screwed into the screw 75. Tighten this pitch plate fixing knob 71 with screw 75.
The pin 79 is pushed to the right by screwing it together with the support wall 58b and moving it to the right in FIG.
fixed in a fixed position.

On the other hand, by moving the pitch plate fixing knob 71 leftward, the pin 79 retreats leftward from the lower space 57, and the pitch plate 60 becomes movable along the longitudinal direction of the vertical rail 5.

Further, as shown in FIG.
A link mechanism 80 is disposed to release the engagement with 4 and 65.

The link mechanism 80 connects the vertical carriage 6 to the first link mechanism 80.
The engaging claw engaging link 82 is rotatably attached to the fixed support shaft 81, and the vertical carriage 6
An operation link 84 rotatably attached to the holder by a second fixed support shaft 83, and each of these links 8
A movable support shaft 85 is provided at one end 82a, 84a of 2, 84,
86 and a connecting link 87 rotatably attached.

In the above-mentioned engaging claw engagement link 82, the other end 82b that engages with each of the above-mentioned engaging claws 27, 28, 29, 30, 31 is formed into a tapered shape, and an engaging claw pressing protrusion 89 is provided on the edge thereof. ing.

On the other hand, a hooking claw pressing plate 90 is attached to a pivot 33 which is installed on the support frame 26 and rotatably supports each of the claws 27, 28, 29, 30, 31 via legs 90A, 90A. It is rotatably mounted. The pressing plate 90 has a rear surface (right side in FIG. 5) serving as an engaging pawl contact surface 91, and a front surface (left side in FIG. 5) serving as the engaging pawl engagement link 82.
The other end 82b forms a link contact surface 92 that comes into contact with the other end 82b. Each of the above claws 27, 28, 29, 30, 31
Engagement claw rotation operation pieces 93, 94, 95, 96, and 97 are formed to hang down and face the engagement claw contact surface 91.

The operation link 84 has a substantially fan shape, and the other end 8
The 4b side protrudes from the vertical carriage 6 toward the drafting head 8 and is placed below the hinge member 7 that connects the drafting head 8 and the vertical carriage 6. As shown in FIG. 3, a midway portion 84c of the operating link 84 protruding outward from the vertical carriage 6 is bent into an L-shape via an upwardly inclined portion 98, and the other end of the link 84 84b is positioned at a predetermined height above the one end 84a side.

The other end 84b of the operation link 84 is provided with a long hole 99 extending in the left-right direction in FIG. A link operating pin 101 is inserted into the elongated hole 99 and is suspended from the lower surface 100A of the connecting plate 100 constituting the hinge member 7. The base end 101a of this operating pin 101 is connected to the connecting plate 1.
Hinge mechanism 10 arranged on the lower surface 100A of 00
2, it is integrally connected to a link operation plate 103 which is disposed on the upper surface 100B of the connecting plate 100 so as to be slidable in the left-right direction in FIG.

The hinge mechanism 102 includes a pair of U-shaped bearing pieces 104, 104 protruding from the lower surface 103A of the link operation plate 103, as shown in FIG.
The base end 101a of the link operation pin 101 is composed of a fixed support shaft 105 fitted and supported by each of these bearing pieces 104, 104, and a cylindrical spacer 106 rotatably fitted into the support shaft 105. is fixed to the spacer 106.

By the hinge mechanism 102, the drafting head 8
In order to perform floating operation, the above connecting plate 1
00, the pivot 107 constituting the hinge member 7
Even if the link operation pin 101 is rotated counterclockwise in FIG. 3 using the fulcrum as a fulcrum, the link operation pin 101 moves along the elongated hole 99, and the state of engagement between the pin 101 and the elongated hole 99 is maintained.

Further, the link operation plate 103 and the connection plate 1
00 is provided with a stopper device 108 for fixing the operating plate 103 to the connecting plate 100 in a click manner at the pre-operation position and the post-operation position.

As shown in FIG. 10, the stopper device 108 includes a ball insertion hole 109 formed in the longitudinal direction midway of the connection plate 100 so as to vertically penetrate the connection plate 100, and a ball insertion hole 109 inserted into the insertion hole 109. The stopper ball 111 is elastically biased by a compression coil spring 110 so as to come into pressure contact with the lower surface 103A of the link operation plate 103.
and a first portion formed on the lower surface 103A of the link operation plate 103 and engaged with the upper half of the ball 111.
and second hemispherical recesses 112 and 113.

That is, the link operation board 103
In the position shown by the solid line in the figure (position after activation), the ball 111 is in the first hemispherical recess 112.
are fitted and placed in a fixed state with the connecting plate 100,
The position shown by the two-dot chain line in Figure 10 (position before operation)
In this case, the ball 111 fits into the second hemispherical recess 113 and is fixed to the connecting plate 100.

Next, the operation of the link mechanism 80 will be explained with reference to FIGS. 11 to 13.

When the link operation plate 103 is slid to the right in FIG. 11, the operation link 84 is moved to the second fixed support by the link operation pin 101 which is pulled in the right direction in FIG. 11 together with the operation plate 103. It rotates clockwise in FIG. 11 using the shaft 83 as a fulcrum. As the operating link 84 rotates, the connecting link 87 is pulled upward in FIG. 11, and the engaging claw engaging link 82 rotates clockwise about the first fixed support shaft 81 as a fulcrum. When the engaging pawl engaging link 82 rotates, the engaging pawl pressing protrusion 89 comes into a state of protruding toward the engaging pawl pressing plate 90, and as shown in FIG. Pituchislit 61
The engaging claw rotating operation piece 93 of the first engaging claw 27 that is engaged with the engaging claw 27 is pushed to the right in FIG. 12 by the engaging claw pressing protrusion 89 via the engaging claw pressing plate 90. . Then, the engaging pawl 27 engages with the pivot 3.
3 as a fulcrum in the counterclockwise direction in FIG. 12, and the claw tip 27a of the engaging claw 27 is removed from the slit 61 as shown in FIG. 13.

In this way, by the combination of the link mechanism 80 and the pressing plate 90, each of the claws 27, 28, 2
Which of 9, 30, and 31 is each slit 6 above?
Even if it is engaged with 1, 62, 63, 64, 65,
The claw and the slit can be separated from each other by a simple sliding operation of the link operation plate 103 without returning the engaging claw selection adjustment knob 49 to the "0" position. The link operation plate 103 is located on the upper surface 100B of the connecting plate 100 of the hinge member 7 that connects the drafting head 8 and the vertical carriage 6.
Since the link operation board 103 is provided in
can be operated by the hand holding the drafting head 8, making the operation easy.

As is clear from the above description, according to the present invention, the engaging pawl that engages with the pitch plate can be released or engaged by operating the link mechanism without rotating the knob. Since the operation part of the link mechanism is provided so as to protrude toward the drafting head side, the link mechanism can be operated by the hand holding the drafting head, so the engaging claw can be operated remotely. The pitch plate can be engaged or released by operation. Therefore, the engagement or release operation between the pitch plate and the engaging pawl becomes easy, for example.
When repeatedly drawing parallel lines at regular intervals at arbitrary positions on the drawing board, the drawing head can be immediately returned to the front on the drawing board, making the line drawing work easier.

In addition, since it is easy to engage or release the pitch board and the engaging claw, it is possible to draw regular lines and draw lines at equal intervals at any position on the drawing board, speeding up the drafting work. can be done.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a rail-type drafting machine equipped with a fixed pitch stopping device for a drafting head according to the present invention.
FIG. 2 is an enlarged plan view of a vertical carriage showing an embodiment of the present invention, and is a view showing a case where the engaging pawl and the fixed pitch slit are in an engaged state. Third
The figure is an enlarged sectional view taken along the line A--A in FIG. 1. FIG. 4 is an exploded, enlarged perspective view of the engaging pawl unit. Fifth
The figure is a sectional view taken along the line B--B in FIG. 2. FIG. 6 is an enlarged side view showing the engaged state of the engaging claw and the engaging claw supporting cam. FIG. 7 is an enlarged longitudinal sectional front view of the vicinity of the pitch plate disposed portion of the vertical rail. FIG. 8 is an enlarged plan view of the pitch plate. Figures 9A to 9F
FIG. 3 is an enlarged plan view showing the relationship between the engaging pawl selection adjustment knob and the engaging pawl supporting cam, respectively. FIG. 10 is a sectional view taken along the line CC in FIG. 2. FIG. 11 is an enlarged plan view of the vertical carriage, showing a case where the engaging pawl and the fixed pitch slit are in a separated state. FIG. 12 is an enlarged side view showing a state in which the engaging pawl and the fixed pitch slit are engaged. FIG. 13 is an enlarged side view showing a state in which the engaging pawl and the fixed pitch slit are separated. 5... Vertical rail, 6... Vertical carriage, 8...
Drafting head, 23... fixed pitch stop device, 27,
28, 29, 30, 31... Engaging claw, 60... Pitch plate, 61, 62, 63, 64, 65... Fixed pitch slit, 80... Link mechanism, 82... Engaging claw engaging link, 84... Operation link, 103...
...Link operation board.

Claims (1)

[Scope of utility model registration request] A pitch plate fixed to the vertical rail and having fixed pitch slits arranged at a constant pitch in the longitudinal direction of the rail, and a vertical carriage fixed to the vertical carriage for moving the drafting head along the longitudinal direction of the vertical rail. A hooking pawl that engages with the pitch slit of the pitch plate to fix the drafting head to the vertical rail at a constant pitch; One end of the link mechanism serves as an engaging end with the engaging pawl, and the other end protrudes toward the drafting head and serves as an operating end of the link mechanism. A constant pitch stopping device for a drafting head, characterized in that a link operating member is provided at the end.