DE3313403A1 - Method and device for clamping, fastening and removing a sheet-type recording medium on a roller - Google Patents

Abstract

The invention relates to a method and a device for clamping, fastening and removing a sheet-type recording medium (90) in a recording apparatus. A roller body (10), constructed as a negative pressure hollow cylinder, is driven in rotation about the longitudinal axis (X) of a first shaft (12) for the recording operation and, for fastening the recording medium (90), has a suction channel system (5), which is known per se, and, for clamping and removing, a device (30) which comprises a plurality of gripper elements (35), which are mounted on a second shaft (31) and are operatively connected thereto, and at least one actuating member (33). The recording medium (90) is clamped on the roller (100) in a position of rest in which the gripper elements (35) are swivelled into a first open position by the engagement of a first switching runner (50) with the actuating member (33) and held by the negative pressure during the rotary movement, the gripper elements (35) being swivelled into a second open position, during the decelerated rotary movement, by the engagement of a second switching runner (55) with the actuating member (33) and the recording medium (90) is thus lifted from the roller (100), led off and removed. <IMAGE>

Description

Method and device for clamping, holding and

Unclamping a sheet-shaped recording medium on a drum The invention relates to a method and a device for tensioning, holders and unclamping a sheet-shaped recording medium in a recording device with a rotatably mounted about the longitudinal axis of a first shaft, as a hollow vacuum cylinder trained and provided on the outer circumferential surface with a suction channel system Drum.

For holding a writing sheet in a recording device with rotatable mounted drum according to DE-C-23 49 217 a device is known which to stretch the writing sheet several protruding outward through a slot Clamps as well as for holding the writing sheet-a in a longitudinal groove of the drum includes lying and in the axial direction over the drum reaching linear, Zum One end of the writing sheet is stretched between each with one angled approach and a groove provided as well as on an eccentric to the drum longitudinal axis mounted brackets inserted, from the brackets against pressed the bottom of the drum slot and then by turning the Drum pulled under the ruler lying on the drum and after the complete rotation for the actual recording process the other one The end of the writing paper is clamped under the ruler. After the recording process has been completed the writing sheet is removed manually by loosening the clamps and the ruler from the Drum removed. In the device described, for the recording process the writing sheet on the one hand through the clips and on the other hand through the ruler held on the drum surface.

Recording devices of a modern design are also part of the state of the art for higher recording rotational speeds according to US Pat. No. 4,101,018 and according to to mention DE-A 30 00 887, in each of which a sheet-shaped recording medium essentially by one generated on the outer circumferential surface of the drum shell The negative pressure is kept largely stable and lying flat on the drum surface is.

The inventive method has the task of using one of the above-mentioned for the prior art and as a vacuum hollow cylinder formed drum a recording medium for the recording process without additional manual help, functionally reliable and quick to open and unclamp.

The inventive method is characterized in that the recorded for the recording process of the drum supplied recording media and then drawn onto the rotatingly driven drum so that it lies flat and is held in a stable position by the negative pressure, and that after completion Recording process of the recording media automatically from the drum surface is lifted off and diverted from the drum.

According to a further feature, the method according to the invention is under Use of at least one actuator mounted on a second shaft and several gripper elements, characterized in that for clamping the recording medium the actuating member that is operatively connected to the second shaft and the individual gripper elements by the engagement of a first skid and for unclamping the recording medium through the engagement of a second skid around the longitudinal axis of the second shaft be pivoted.

The device according to the invention for carrying out the process mentioned includes the second shaft mounted in the drum, the actuator and the each pressed with a clamping part against a clamping part provided on the drum body Gripper elements and is characterized in that a) the actuating member laterally arranged on the drum body on the second shaft and around the longitudinal axis of the second Shaft is pivotably mounted, bo the individual gripper element each in one in the drum body provided recess arranged and against the restoring force at least one Spring pivotable on the second shaft.

c) the gripper element for clamping the recording medium between the inside of the clamping part and a substantially transverse to it Web has a recess, and d) the web of the arranged under the clamping part Gripper element is designed for clamping the recording medium.

Further features of the invention emerge from the following description in connection with the drawing and the claims.

The invention is described below with reference to the drawing described in more detail. It shows: FIG. 1 a drum shown in perspective view with integrated tensioning and tensioning device for a sheet-shaped recording medium, Fig. 2 shows the drum shown on a larger scale and in side view according to Fig. 1, 3 shows a detail of the illustrated in plan view in Fig. 1 by a circle designated point Y with two gripper elements of Up and down clamping device, FIG. 4 shows a section along the line IV-IV in FIG. 3, FIG. 5 shows a section along the line V-V in FIG. 3 with the sectional view illustrated gripper element of the tensioning and tensioning device, Fig. 6 is a section by the tensioning and tensioning device according to the line VI-VI in Fig. 5, and Fig. 7 shows the schematically illustrated tensioning and tensioning phase of the sheet-shaped recording medium on the drum.

Fig. 1 shows a drum in a schematically represented perspective view 100 for a non-illustrated recording device of a liquid jet recorder.

The drum 100 essentially comprises a drum body 10 integrated tensioning and tensioning device 30 for a sheet-shaped recording medium 90. The hollow cylinder, each with a drum base on both sides 14,15 closed drum body 10 is in the axial direction of a hollow body formed, arranged centrally in the drum body 10 first shaft 12 penetrated and is together with the first shaft 12 about the longitudinal axis X in the direction of arrow 1 rotatably mounted in the recording device. The one on the one hand via a line 17, which is operatively connected to a suction unit 18, has a first shaft 12 in the interior 11 of the drum body 10 a recess 12 '. The coat 10 'of the Drum body 10 is shown schematically on its outer circumferential surface with a Channel system 5 provided, which through openings not shown with the Interior 11 is in communication. By means of the suction unit 18 is on the Drum body peripheral surface a negative pressure is generated by which the recording medium drawn onto the drum body 10 90 is held on the outer circumference of the drum body.

The drum 100 is with two sides of the one in Fig. 1 in part In the broken state shown drum body 10 arranged bearing blocks 16 stored in the recording medium, only one bearing block 16 being shown in FIG is. Furthermore, one recognizes in Fig. 1 a corresponding to the tensioning and tensioning device 30 and parallel to the first shaft 12 arranged weight compensation body 13, which is stored in the two drum bases 14,15 in a manner not shown and is attached by means not shown.

The clamping device shown schematically in FIG. 1 30 comprises a plurality of gripper elements 35 which are distributed in the axial direction of the drum 100 are arranged and mounted on a second shaft 31. The one in the axial direction the drum body 10 and essentially the two drum bottoms bp, 15 penetrating second shaft 31 is arranged in bearing parts 40 fastened laterally to the drum bases, wherein in Fig. 1 only that attached to the drum base 15 by means not shown Bearing part 40 is shown. Furthermore, one recognizes in Fig. 1 one on the second Actuator mounted on shaft 31. 33 and one on the actuator 33 arranged- ramp 34.

In Fig. 2, the drum 100 is shown in side view and one recognizes the end face of the drum base 15 which is attached to the drum base 15 Bearing part 40, the second shaft 31 arranged in the bearing part 40, as well as the the second shaft 31 mounted actuating member 33 with the run-up body attached to it 34.

One can also see one in the area of the tensioning and tensioning device 30 provided in the drum base 15 recess 15 ', the one in the region of the recess 15 'visible jacket 10' of the drum body 10 and a portion of a shell-shaped formed tubular body 20. The tubular body 20 penetrates in the axial direction the drum body 10 and essentially separates the interior space 11 from the open and Tensioning device 30.

In Fig. 3 in plan view that is indicated in Fig. 1 by a circle Place Y and you can see the partially broken one on one side and the jacket 10 'of the drum body 10, shown in section, the drum base 15 and the bearing part 40 attached to the end face of the drum base 15 for the second shaft 31. In the drum body 10 are arranged at a distance from one another Recesses 25 are provided in which the gripper elements mounted on the second shaft 31 35 are arranged. You can also see a partially visible one Part of the tubular body 20, which is attached to the drum body 10 with screws 22, 22 ' is attached.

FIG. 4 shows a formative section along the line IV-IV in FIG the recess 25 for the individual gripper element 35. The recess 25 is radial Direction through walls 23,23 'and in the axial direction through walls 24,24' (Fig. 6) limited. On one side there is a radial in connection with the recess 25 Guide slot oriented towards the drum body 10 and delimited by a wall 26 ' 26 and a clamping part oriented in the axial longitudinal direction of the drum body 10 27 provided for the gripper element 35. As can be seen from FIGS. 1 and 4, extends the clamping part 27 extends in the axial direction over the entire length of the drum body 10.

Fig. 5 shows on a larger scale a section along the line V-V in Fig. 3 and one recognizes a part of the jacket -10 ', - a part of the Drum base 15, the bearing part 40 attached to the drum base 15 and the in the jacket 10 'arranged recess 25. The in the drum body 10 at a distance Recesses 25 arranged relative to one another are, as already mentioned, through the tubular body 20 separated from the interior 11 of the drum body 10. On the shell-shaped A support part 21,21 'is attached to the tubular body 20 on each side.

The two support parts 21,21 'are on one side with a the inside diameter of the drum body 10 provided corresponding shape. ' The tubular body 20 penetrating the drum body lo in the axial direction is in the Area of the recesses 25 by means of the screws 22, 22 '(Fig. 3) and the support parts 21,21 'fastened in a sealing manner in the interior 11 of the drum body. On the bottom of the two bearing parts 40 is one which penetrates the tubular body 20 in the axial direction Mounted carrier 41, on which support bearings 32 arranged at a distance from one another are attached by means not shown. The second shaft 31 is on the one hand in the two bearing parts 40 attached to the drum bases 14, 15 and on the other hand stored in the support bearings 32 arranged on the carrier 41.

Furthermore, in FIG. 5 one recognizes that which is mounted on the second shaft 31 Gripper element 35, which is essentially a clamping part 36, a web 37 and a hub part 39 provided with a through hole 39 ′.

Between the web 37 and the inner side 36 'of the web facing the web Clamping part 36, a recess 38 is provided. The inside 36 'of the clamping part 36 and a first slope 37 'of the web 37 facing the inside are shown in FIG essentially parallel, inclined to each other arranged. At the front of the web 37, which is somewhat longer than the clamping part 36, is a second bevel 37 ". The gripper element 35 is with the hub part 39 on the second shaft 31 pushed, operatively connected to the second shaft by a feather key 45 and with of the second shaft 31 about the shaft longitudinal axis X 'against the restoring force at least a spring 44 acting on the gripper element 35 and on the carrier 41 in the direction of the arrow 2 swiveling.

Fig. 6 shows a section through the drum body 10 according to the line VI-VI in FIG. 5 and the gripper elements mounted on the second shaft 31 can be seen 35, which in the recesses delimited by the walls 24,24 'of the casing 10' 25 are arranged. Furthermore, the drum base 15 can be seen in the recess 15 'mounted tubular body 20, which is attached to the drum base by means not shown attached bearing part 40, the carrier 41 attached to the bearing part 40 and the on the carrier 41 with means not shown, support bearings 32 for the second wave 31.

In the illustrated embodiment, the gripper element 35 is with the clamping part 36 by two acting on the gripper element 35 and on the carrier 41 Springs 44, 44 'drawn against the clamping part 27 of the drum body 10. For fixing the springs 44,44 'is on the web 37- of the gripper element 35 by a schematic illustrated securing elements 47 held screw bolts 46 and on the carrier 41 a screw bolt held by schematically illustrated securing elements 43 42,42 'provided.

The mode of operation of the clamping and unclamping device 30 described is described below: In Fig. 7 is schematic and in several different positions "A" to "E" of the unclamping and unclamping cycle of the sheet-shaped Recording medium 90 on the means, not shown, about the longitudinal axis X of the first shaft 12 shown drum 100 rotated in the direction of arrow 1, wherein the actuating member 33 and partially the gripper element 35 in the effective clamping phase "B" and in the effective guy phase D "by solid lines and in the ineffective ones Basic positions "Å", "C" and "E" are shown by dot-dash lines.

Starting from the basic position "A", the Drum 100 in the direction of arrow 1 for clamping the recording medium 90 das Actuating member 33 with the run-up body 34 with a first switch runner 50 in engagement brought. When contacting the runner body ball part 34 'with the running surface 50 'becomes the actuating element which is mounted on the second shaft 31 and is operatively connected to it 33 and the gripper element 35, which is operatively connected to the second shaft 31, accordingly pivoted about the axis X 'of the second shaft 31 from the basic position in the direction of arrow 2 and deflected. As soon as the runner ball part 34 'the sliding surface 50 "of the skid 50 contacted, the maximum deflection of the two parts is 33,35 and simultaneously a rest position "B" of the drum 100 for inserting and clamping the recording medium achieved.

In the rest position "B", for example, one in the recording device arranged, not shown roll of the recording medium 90 withdrawn and through correspondingly assigned guide plates 51,52 in the between the Steq 37 and the clamping part 36 of the gripper element 35 in the direction of the arrow provided in the recess -zÆ8R-inserted. Then, in a manner not shown in detail, the skid 50 except Engagement of the runner body 34 brought, so that thereby the runner body ball part 34 'comes out of engagement of the sliding surface 50 "and at the same time the two parts 33,35 pivoted into the basic position by the restoring force of the springs 44,44 ' in which the recording medium 90 between the clamping surface 36 'of the clamping part 36 and the clamping part 27 provided on the drum body 10 is clamped.

For the recording process, the drum 100 is rotated in the direction of the arrow 1 rotated, the recording medium 90 in the clamping phase by the gripper elements 35 and in the recording phase additionally by the one on the drum body peripheral surface by means of the suction unit 18 generated negative pressure stably and smoothly adjacent to the Drum body 10 is held. Another, tangent to drum 100 and away from it The pressure roller 80 driven in the direction of the arrow 4 is particularly effective in the tensioning phase the partially lifted recording medium 90 is not affected by the negative pressure more adequately recorded and transported on - perfect transport of the recording medium 90.

When the recording is finished, the rotary movement is braked for unclamping the recording medium 90 from the drum 100 in no more detail depicted. Way a second skid 55 is supplied and with that in the basic position C with the drum 100 rotated in the direction of arrow 1 actuator 33 in engagement brought. When the run-up body ball part 34 'comes into contact with the run-up surface 55 ', the actuating member 33 and the gripper element 35 are correspondingly deflected and the guying phase D ″ initiated. As soon as the run-up body ball part 34 'dies Contacted sliding surface 55 ″ of the skid 55 is the maximum deflection of the two Parts 33.35 and thus the transfer phase of the recording medium reached. In this The phase is the front part of the recording medium 90 due to the rotary movement the parts 100, 33 and 35 have already been pulled out of the recess 38 of the gripper element 35, raised from the web 37 and through the second slope 37 ″ of the web 37 in the direction of the arrow 3 'into an intermediate space 58 of two guide plates arranged at a distance from one another 56.57 introduced. The comb-like baffles, not shown in detail 56,57 are for the pivoting movement of the gripper elements 35 with appropriately designed, not shown provided recesses. After the tensioning phase "D" arrives while the drum 100 rotates evenly, the ball part 34 ' out of engagement of the sliding surface 55 ", whereby the two parts 33, .35 by the restoring force the springs 44,44 'are pivoted into the basic position "E".

For the rotary movement of the Drum 100 in the direction of arrow 1, the two runners 50, 55 are not shown Means and in a manner not shown disengaged together with the drum 100 rotating actuating part 33 and for the clamping and unclamping process, 7 position "B" and position "D", again in engagement of the actuating part 33 brought. The sliding surface 50 ″ of the first shifting runner 50 and the sliding surface 55 "of the second skid 55 is preferably circular, concentric to the Axis X of the first shaft 12 is arranged.

The position of the parts 33,35 in relation to the drum body 10 are in the basic positions "A", C and E ", neglecting the respective sheet thickness of the recording medium is essentially the same. Blank page

Claims (11)

TO LANGUAGE 1. Procedure for clamping, holding and unclamping a sheet-shaped recording medium (90) in a recording device with a the longitudinal axis of a first shaft (12) rotatably mounted as a hollow vacuum cylinder trained and on the outer circumferential surface with a suction channel system (5) provided drum (100), characterized in that the for the recording process the recording medium (90) fed to the drum (100) is detected and then on the rotatingly driven drum (100) pulled smoothly and through the negative pressure is kept in a stable position, and that after completion. Recording process the recording medium (90) is automatically lifted from the drum surface and is derived from the drum (100). 2. The method of claim 1, using at least one on a second shaft (31) mounted actuator (33) and several gripper elements (35), characterized in that for clamping the recording medium (90) the actuating member (33) operatively connected to the second shaft (31) and the individual Gripper elements (35) through the engagement of a first switch runner (50) and for tensioning of the recording medium (90) by the engagement of a second switch shoe (55) the longitudinal axis (X ') of the second shaft (31) can be pivoted. 3. The method according to claim 1 and 2, characterized in that the Clamping the recording medium (90) in a rest position and unclamping it takes place when the rotary movement of the drum (100) is braked. 4. Device for performing the method according to one of the claims 1 to 3, comprising the second shaft (31) mounted in the drum (100), the actuating member (33) and each with a clamping part (36) against one provided on the drum body (10) Clamping part (27) pressed gripper elements (35), characterized in that a) the actuator (33) on the side of the drum body (10) on the second shaft (31) is arranged and pivotably mounted about the longitudinal axis (X ') of the second shaft, b) the individual gripper element (35) each provided in one in the drum body (10) Recess (25) arranged and against the restoring force of at least one spring (44,44 '). is pivotably mounted on the second shaft (31), c) the gripper element (35) for The recording medium (90) is clamped between the inside (36 ') of the clamping part (36) and a web (37) oriented essentially transversely thereto, a recess (38), and d) the web (37) of the gripper element arranged below the clamping part (36) (35) is designed for tensioning the recording medium (90). 5. Device for performing the method according to claim 2, characterized characterized in that the first switching runner (50) is formed in the shape of a circular arc Sliding surface (50 ") and the second switching runner (55) are designed in the shape of an arc of a circle Has sliding surface (55 "), and that both sliding surfaces (50", 55 ") are concentric to the Axis (X) of the first shaft (12) of the drum (100) are arranged. 6. Device according to claim 4, characterized in that on the one end of the actuating part (33) a run-up body (34) with a spherical shape Body part (34 ') is arranged. 7. Device according to claim 4, characterized in that the essentially from the second shaft (31), the gripper elements (35) and the actuating member (33) formed tensioning and tensioning device (30) designed as a structural unit, is arranged and stored in the drum body (10). 8. Device according to claim 4 and 7, characterized in that the tensioning and tensioning device (30) by means of the drum body in the axial direction (10) penetrating, half-shell-shaped tubular body (2) with respect to the interior (11) of the drum body (10) is sealingly separated. 9. Device according to claim 4, characterized in that the recess (38) provided in the gripper element (35) through the inside (36 ') of the clamping part (36) and by a first bevel (37 ') arranged at a distance from it of the web (37) is formed, and that the first slope (37 ') and the inside (36 ') are arranged essentially parallel, inclined to one another. 10. Device according to claim 4, characterized in that the The web (37) is somewhat longer in relation to the hub part (39) of the gripper element (35) is designed as the clamping part (36), and for lifting the recording medium (90) is provided with a second bevel (37 ") on its end face. 11. The device according to claim 4, characterized in that the Corresponding clamping part (27) when the gripper element (35) is installed to the incline of the inside (36 ') of the clamping part (36) is formed, in the axial direction Direction over the entire length of the drum body (10) and for guiding the Gripper element (35) with spaced apart slots (26) for the Web (37) is provided.